JP2014180605A - Coating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent water immersion into a seal groove in a coating device having a seal structure formed by the seal groove and an O-ring on an upper end face of an underplate.SOLUTION: A coating device A comprises: an underplate 26 which is a dish-shaped whose outer peripheral edge part stands up; a spacer 34 (cylindrical member) which is formed into an approximate cylindrical shape whose vertical faces are opened, and is assembled in a state that it is mounted on an upper end face of the outer peripheral edge part of the underplate 26; a seal groove 51 which is formed into a continuous recess shape over the whole periphery of the upper end face of the outer peripheral edge part of the underplate 26 and which has a trapezoid cross section in which a width dimension in a radial direction becomes the smallest at an opened edge 52; and an O-ring 55 stored in the seal groove 51, and sticking to the opened edge 52 of the seal groove 51 in a liquid-tight state in a state that the spacer 34 is removed from the underplate 26.

Description

  The present invention relates to a coating apparatus.

  In Patent Document 1, a rotatable drum having a substantially cylindrical shape whose upper and lower surfaces are open, a dish-shaped disk arranged so as to close the lower surface of the drum and rotating coaxially with the drum, A coating apparatus is disclosed in which a coating tank is constituted by an under plate that is attached to a lower end edge of a drum so as to be integrally rotatable in a covered state. When the center of the core of chocolate confectionery, chewing gum, bean confectionery, etc. and the coating tank filled with a coating agent such as chocolate or syrup are rotated, the center and the coating agent are stirred while flowing, and the center surface is coated. A layer is formed.

Japanese Patent No. 4740419

  When cleaning the coating tank after the coating process, first, in order to prevent the coating agent adhering to the inner peripheral surface of the drum or the upper surface of the disk from drying and sticking, It is preferable to collect cleaning water to roughly clean the inner peripheral surface of the drum, the upper surface of the disk, and the like. In order to perform rough cleaning with cleaning water, it is necessary to provide sealing means for preventing water leakage in the gap between the lower end edge of the drum and the upper end edge of the under plate.

  As a sealing means, a general seal structure in which a seal groove having a square cross section is formed on the upper end surface of the under plate and an O-ring is accommodated in the seal groove is conceivable. When applied to, the following problems are concerned. That is, after the inside of the coating tank is roughly cleaned, the drum is removed from the under plate, and the drum and the under plate are separately finished and cleaned. Since the under plate is directly connected to the rotation drive mechanism, it is finished and washed by applying water with a hose or the like in a posture in which the seal groove opens upward.

  However, since there is a gap between the inner surface of the seal groove and the O-ring, cleaning water is accumulated in this gap. Because the under plate is difficult to flip upside down due to its mechanism, there is a problem that it takes time and labor for the operator to exhaust completely the water that has entered the gap between the seal groove and the O-ring. . In addition, if water remains in the seal groove, molds are generated in the coating tank, which is a problem in terms of hygiene in a coating apparatus that handles food.

  The present invention has been completed based on the above-described circumstances, and in a coating apparatus in which a seal structure using a seal groove and an O-ring is provided on the upper end surface of the under plate, it is possible to prevent water from entering the seal groove. With the goal.

The present invention
An under plate that forms a substantially circular dish with an outer peripheral edge raised,
A drum that is substantially cylindrical with both upper and lower surfaces open, and is assembled in a state of being placed on the upper end surface of the outer peripheral edge of the under plate;
A dish-like disc that is disposed so as to close the lower surface of the drum above the under plate, and is rotatable relative to the under plate and the drum;
It is a form in which the upper end surface of the outer peripheral edge of the under plate is continuously recessed over the entire circumference, and a seal groove with a trapezoidal cross section in which the radial width dimension is minimum at the opening edge,
It is characterized in that it is provided with an O-ring that is housed in the seal groove and adheres in a liquid-tight manner to the opening edge of the seal groove when the drum is removed from the under plate.

  According to this configuration, when the drum is assembled to the under plate, and cleaning water is stored in the drum, water leakage from the gap between the drum and the under plate is prevented by the sealing function of the O-ring. When the drum is removed from the under plate, the O-ring adheres to the opening edge of the seal groove in a liquid-tight manner, so that water can enter the seal groove even if the under plate is washed with water. There is nothing.

The front view showing the state which made the coating tank into the standing posture in Example 1. Front view showing the coating tank tilted Sectional view showing the coating tank in a standing position Partial enlarged sectional view of FIG. FIG. 4 is a sectional view showing the sealing means partially enlarged. 5 is a cross-sectional view showing a state where the spacer is removed from the under plate. Partial expanded sectional view showing the coating tank of Example 2

The coating apparatus of the present invention comprises:
The under plate and the cylindrical member may be integrally rotated.
In this configuration, when the water is stored in the coating tank and the rough cleaning is performed with the underplate, the cylindrical member, and the disk rotated, the centrifugal force acts on the stored water. It is easy to leak from the gap between the tube and the tubular member. However, according to the present invention, water leakage can be reliably prevented.

The coating apparatus of the present invention comprises:
With the drum removed from the under plate, the minimum angle formed by the upper end surface of the under plate and the tangent line circumscribing the region of the O-ring that protrudes upward from the upper end surface of the under plate is an obtuse angle. It may be.
According to this configuration, when water adheres to the upper end surface of the under plate and the protruding portion from the seal groove in the O-ring, it is easy to remove the water.

The coating apparatus of the present invention comprises:
In the process of assembling the drum to the under plate, the O-ring may be elastically deformed while maintaining a state in contact with the inner surface of the seal groove.
According to this configuration, even when water is attached to the upper end portion of the O-ring or the upper end surface of the under plate in a state where the drum is removed from the under plate, it is attached in the process of assembling the drum to the under plate. There is no risk that water will enter the seal groove.

The coating apparatus of the present invention comprises:
The seal groove may be filled with a filler.
According to this configuration, since no gap exists in the seal groove, it is possible to reliably prevent water from entering the seal groove. Further, since the filler is always sealed by the O-ring, there is no possibility that the filler leaks out of the seal groove and enters the center or coating agent in the coating tank.

<Example 1>
A first embodiment of the present invention will be described below with reference to FIGS.

<Outline of coating apparatus A>
The coating apparatus A of the present embodiment is a coating made of a coating agent such as chocolate or syrup on the surface of a center (not shown) such as chocolate confectionery, chewing gum, bean confectionery, or tablet in the coating tank 25. A layer (not shown) is formed. The coating tank 25 is shown in FIG. 1 by the tilting mechanism 11 provided on the base 10 placed on the floor surface and in the standing position shown in FIG. 1 (position where the rotation center axis of the coating tank 25 is substantially vertical). It is displaced between the tilting posture (the posture in which the rotation center axis of the coating tank 25 is inclined with respect to the vertical direction).

  According to the type of the center, the coating apparatus A can be used in any of the usage modes of the usage mode in which the coating process in the standing posture and the coating processing in the tilted posture are used together and the usage mode in which the coating process is performed only in the tilted posture. It can be adapted to. In the following description, the vertical direction is based on the state where the coating tank 25 is in the standing posture.

  As shown in FIG. 1, the tilting mechanism 11 includes a pair of horizontal tilting shafts 12 provided on the base 10 at intervals in the horizontal direction, and a tilting motor for rotating the tilting shaft 12 by a predetermined angle (illustrated). (Omitted). A tilting frame 14 that supports the coating tank 25 is attached to the tilting shaft 12 so that it can tilt integrally. As shown in FIG. 3, the first motor 15 and the second motor 17 are attached to the horizontal base plate 24 of the tilt frame 14 so as to be able to tilt integrally with the tilt frame 14. The first motor 15 has a first drive shaft 16 that protrudes upward coaxially with the rotation center of the coating tank 25 and rotates in both forward and reverse directions. A substantially cylindrical rotating member 19 is attached to the first drive shaft 16 so as to rotate integrally.

  The second motor 17 has a second drive shaft 18 that is parallel to the first drive shaft 16 and protrudes upward, and is arranged in an eccentric positional relationship with respect to the first motor 15. The second motor 17 and the first motor 15 are controlled to operate individually. Therefore, the second drive shaft 18 rotates in both forward and reverse directions independently of the first drive shaft 16. A drive gear 23 is attached to the second drive shaft 18 so as to rotate integrally. A horizontal base plate 24 is fixedly attached to the first motor 15 and the second motor 17. The first drive shaft 16 and the second drive shaft 18 described above pass through the base plate 24 and protrude upward.

<Coating tank 25>
A coating tank 25 is rotatably supported on the upper surface of the base plate 24. The coating tank 25 includes a stainless steel under plate 26, a stainless steel drum 28, a stainless steel spacer 34 (cylindrical member described in claims), and a stainless steel disk 38. .

  The under plate 26 has a circular dish shape with a recessed upper surface, and the outer peripheral edge rises substantially upward in the vertical direction over the entire circumference. A drain hole 44 that is opened and closed by a lid 45 is formed in the outer peripheral edge of the bottom wall of the under plate 26 so as to penetrate vertically. The under plate 26 is supported by the base plate 24 so as to be coaxial with the first drive shaft 16 and relatively rotatable with respect to the first drive shaft 16 through a bearing at a position above the base plate 24. A rotating member 19 that rotates integrally with the first drive shaft 16 passes through the center hole of the under plate 26. On the lower surface of the under plate 26, an internal gear 13 which is coaxial with the under plate 26 and has a tooth row formed on the inner periphery thereof is attached so as to be able to rotate integrally. Due to the engagement between the internal gear 13 and the drive gear 23 of the second drive shaft 18, the under plate 26 is rotationally driven in both forward and reverse directions while being decelerated by the second motor 17.

  The spacer 34 has a cylindrical shape and is assembled so as to be integrally rotatable and detachable coaxially in a state where the spacer 34 is placed and stacked on the upper end surface of the outer peripheral edge of the under plate 26. The fixing structure of the under plate 26 and the spacer 34 will be described in detail later. The gap between the upper end surface of the assembled under plate 26 and the lower end surface of the spacer 34 is sealed in a liquid-tight manner by a sealing means 50 including a seal groove 51 and an O-ring 55 described later. A spacer 34 having a suitable height is selected and attached in accordance with the height of the outer peripheral edge of the disk 38.

  The drum 28 has a substantially cylindrical shape whose upper and lower surfaces are opened as a whole, and includes three upper and lower cylindrical portions having different inner peripheral shapes, 29, 30, 31 and a reinforcing deformation restricting portion 32 having a ring shape. This is a concentric form. The uppermost cylindrical portion is a narrowed portion 29 having a diameter reduced upward. The central portion of the cylindrical portion is a main body portion 30 having a substantially constant diameter from the upper end to the lower end. The lowermost cylindrical portion is a tapered portion 31 having a diameter gradually reduced downward.

  The plate | board thickness dimension (diameter direction dimension) of said narrow part 29, the main-body part 30, and the taper part 31 is substantially constant over them, and is comparatively thin. Therefore, as shown in FIG. 4, a deformation restricting portion 32 is formed as means for maintaining the shape of the lower end edge of the drum 28 in a perfect circle. The deformation restricting portion 32 is formed in a perfect circular ring shape and protrudes downward from the lower end edge of the tapered portion 31. The thickness restricting portion 32 in the radial direction has a throttle portion 29, a main body portion 30 and a thickness portion. It is set larger than the plate thickness dimension of the taper portion 31. In addition, a locking rib 33 that protrudes to the outer peripheral side is formed at the lower end of the deformation restricting portion 32 over the entire periphery.

  The drum 28 having the above configuration is assembled with the lower end surface of the deformation restricting portion 32 placed on the upper end surface of the spacer 34. Accordingly, the outer peripheral edge portion of the under plate 26, the spacer 34, and the drum 28 are assembled so as to be able to rotate integrally in a coaxial manner so as to be detachable. The drum 28 is fixed to the under plate 26 together with the spacer 34. This fixing is performed using a circular base ring 35, a plurality of upward bolts 36, and a circular clamping ring 37. The base ring 35 is fixed to the upper end portion of the outer surface of the outer peripheral edge portion of the under plate 26. Upward bolts 36 are assembled to the base ring 35 from below at equal angular intervals in the circumferential direction, and the heads of the upward bolts 36 are locked to the lower surface of the base ring 35.

  The tightening ring 37 is locked to the locking rib 33 of the drum 28 from above. The male thread portion of the upward bolt 36 is screwed into the tightening ring 37. When the upward bolt 36 is tightened, the lower end portion (deformation restricting portion 32) of the drum 28 is fixed to the under plate 26 via the spacer 34 so as to be integrally rotatable. Further, when the upward bolt 36 is loosened, the drum 28 can be removed so as to be detached upward from the spacer 34, and the spacer 34 can be detached so as to be detached upward from the under plate 26.

  The disk 38 forms a shallow circular dish as a whole. The upper surface of the circular bottom plate portion 39 of the disk 38 is covered with a circular center cover 40. A region outside the bottom plate portion 39 of the disk 38 is a functional portion 43 inclined in a tapered shape so as to increase toward the outer periphery. The upper surface of the functional unit 43 is configured by alternately arranging a plurality of fan-shaped discontinuous surfaces and a plurality of triangular discontinuous surfaces in the circumferential direction in order to stir the center and the coating agent. The disk 38 is fixed so as to rotate integrally with the rotating member 19 and the first motor 15 by bolts 41 and 42 with the bottom plate portion 39 placed on the rotating member 19. Further, when the bolts 41 and 42 are loosened, the disk 38 can be removed from the rotating member 19.

<Coating process>
When coating is performed, the coating tank 25 is set in a standing posture or a tilted posture, and the drum 28 and the under plate 26 are rotated at a relatively low speed, and the disk 38 is rotated at a high speed. Launch the center. The inserted center is given a rotational force on the disk 38 and moves upward in the spiral direction along the inner wall of the drum 28 by centrifugal force, and then appears on the surface layer and slides down in the spiral direction due to gravity. Then, the spiral circulation flow of being rotated by the disk 38 again is repeated. If a coating agent is sprayed on the center group stirred by this vortex-like circulation flow, a coating layer is formed on the surface of each center.

  When the coating tank 25 is washed after the coating process, the coating agent adhering to the inner peripheral surface of the drum 28 or the upper surface of the disk 38 is prevented from drying and sticking. Wash water is stored in the tank 25, and the under plate 26, the spacer 34, and the disk 38 are rotated to roughly clean the inner peripheral surface of the drum 28, the upper surface of the disk 38, and the like. At the time of rough cleaning, since centrifugal force acts on the cleaning water in the coating tank 25, there is a concern that water leakage may occur from the gap between the under plate 26 and the spacer 34 or the gap between the spacer 34 and the drum 28. The Therefore, the coating tank 25 of this embodiment is provided with sealing means 50 in the gap between the under plate 26 and the spacer 34 and the gap between the spacer 34 and the drum 28 as means for preventing water leakage during rough cleaning. ing.

<Sealing means 50>
The sealing means 50 includes a seal groove 51, an O-ring 55 attached to the seal groove 51, and a filler 57 filled in the seal groove 51. The seal groove 51 is continuously formed on the upper end surface of the outer peripheral edge of the under plate 26 and the upper end surface of the spacer 34 over the entire circumference. The cross-sectional shape orthogonal to the length direction (circumferential direction) of the seal groove 51 is a trapezoid as shown in FIGS. That is, the width dimension of the seal groove 51 in the radial direction (left and right direction in FIGS. 5 and 6) is the largest at the lower bottom surface of the seal groove 51 and the smallest at the opening edge 52 at the upper end of the seal groove 51. The O-ring 55 has a true circular cross-sectional shape perpendicular to the circumferential direction. As a material for the O-ring 55, NBR (nitrile rubber) is used. As the filler 57, grease is used.

  In the first embodiment, the minimum opening width of the seal groove 51 is 3.65 mm, the depth dimension of the seal groove 51 is 2.9 mm, and the outer diameter dimension of the O-ring 55 is 4.0 mm. According to this dimension setting, as shown in FIG. 6, in a state where the spacer 34 is removed from the under plate 26, the upper end portion of the O-ring 55 protrudes upward from the seal groove 51 of the under plate 26, and from the spacer 34. When the drum 28 is removed, the upper end portion of the O-ring 55 protrudes from the seal groove 51 of the spacer 34. In any of the seal grooves 51, the outer peripheral portion of the O-ring 55 abuts on the opening edge portion 52 of the seal groove 51 in an elastic and liquid-tight manner over the entire periphery. The contact position of the O-ring 55 to the seal groove 51 is a position above the maximum outer diameter portion 56 of the O-ring 55. Further, the minimum angle θ formed by the upper end surface of the under plate 26 and the tangent L circumscribing the region of the O-ring 55 that protrudes upward from the upper end surface of the under plate 26 is an obtuse angle.

  As shown in FIG. 5, in a state where the spacer 34 is placed and assembled on the upper end surface of the under plate 26, the O-ring 55 is crushed up and down by the lower end surface of the spacer 34, and the entire O-ring 55 is elastically deformed. Then, it is accommodated in the seal groove 51. In the process of assembling the spacer 34 to the under plate 26, as the lower end surface of the spacer 34 crushes the O-ring 55, the O-ring 55 always brought its outer peripheral surface into contact with the inner surface 53 of the seal groove 51. Maintain state. In a state in which the spacer 34 is assembled to the under plate 26, the outer periphery of the O-ring 55 is in a sealed state in which the inner surface 53 of the seal groove 51 and the lower end surface of the spacer 34 are in close contact. Thereby, since the clearance gap between the upper end surface of the underplate 26 and the lower end surface of the spacer 34 is sealed in a liquid-tight state, water leakage is prevented.

  Similarly, even when the drum 28 is placed and assembled on the upper end surface of the spacer 34, the O-ring 55 is crushed up and down by the lower end surface of the drum 28, and the entire O-ring 55 is elastically deformed and the seal groove 51. Housed inside. In the process of assembling the drum 28 to the spacer 34, as the lower end surface of the drum 28 crushes the O-ring 55, the O-ring 55 is always in contact with the inner surface 53 of the seal groove 51. To maintain. In the state where the drum 28 is assembled to the spacer 34, the outer periphery of the O-ring 55 is brought into close contact with the inner side surface 53 of the seal groove 51 and the lower end surface of the drum 28 to be in a sealed state. As a result, the gap between the upper end surface of the spacer 34 and the lower end surface of the drum 28 is sealed in a liquid-tight manner to prevent water leakage.

  In the sealed state where the O-ring 55 is accommodated in the seal groove 51, the upper end portion of the inner surface 53 of the seal groove 51 and the upper end portion of the O-ring 55 are located below the opening edge portion 52 of the seal groove 51. A slight gap 54 is generated. Since this gap 54 is blocked from above by the lower end surface of the spacer 34 or the lower end surface of the drum 28, when the spacer 34 or the drum 28 is retracted upward, the gap 54 is opened upward. There is concern that it will remain as a large dent. However, in the process in which the spacer 34 and the drum 28 are displaced upward, the O-ring 55 is elastically restored upward, and accordingly, the contact position between the inner surface 53 of the seal groove 51 and the O-ring 55 rises. The gap 54 gradually becomes smaller and finally disappears. Therefore, there is no possibility that a recess remains in the opening edge portion 52 of the seal groove 51 in a state where the spacer 34 is removed from the under plate 26 or a state where the drum 28 is removed from the spacer 34.

<Washing process>
Next, the finish cleaning operation after the rough cleaning will be described. After rough cleaning, the upward bolt 36 is loosened, the fastening ring 37 is removed from the drum 28, and the drum 28 is lifted and removed from the spacer 34. After removing the drum 28 from the spacer 34, the spacer 34 is lifted and removed from the under plate 26. The removed drum 28 and the spacer 34 are washed to every corner while being sprinkled with water or rubbing with a brush while changing the direction at the washing place.

  At the time of cleaning, there is a concern that when water is applied to the upper end portion of the spacer 34 or the O-ring 55, the water enters the seal groove 51. However, the O-ring 55 is in liquid-tight contact with the opening edge 52 of the seal groove 51, and the inside of the seal groove 51 is filled with the filler 57, so that water can enter from the outside. There is no space to do. Therefore, there is no possibility that water will enter the seal groove 51. Further, since the filler 57 is always sealed by the O-ring 55, there is no possibility that the filler 57 leaks out of the seal groove 51 and enters the center or the coating agent in the coating tank 25.

  Further, when the spacer 34 is turned upside down or the O ring 55 is rubbed with a brush or the like in order to remove the O ring 55 and the vicinity thereof, there is a concern that the O ring 55 may come off from the seal groove 51. However, the seal groove 51 has a trapezoidal cross section, and the O-ring 55 is in close contact with the opening edge 52 which is the minimum width of the seal groove 51, and this close position is a position above the maximum outer diameter portion 56 of the O-ring 55. In addition, since the maximum outer diameter portion 56 of the O-ring 55 is accommodated in the seal groove 51, there is no possibility that the O-ring 55 is detached from the seal groove 51.

  In addition, after the cleaning with water is completed, the water from the spacer 34 is removed with an airbrush or cloth. Here, the minimum angle θ formed by the upper end surface of the spacer 34 and the tangent L circumscribing the region of the O-ring 55 that protrudes above the upper end surface of the spacer 34 is set to an obtuse angle. Therefore, when water adheres to the upper end surface of the spacer 34 and the protruding portion of the O-ring 55 from the seal groove 51, the water hardly remains in the vicinity of the opening edge 52 of the seal groove 51, and the water is reliably removed. can do.

  On the other hand, with respect to the under plate 26 after the drum 28 and the spacer 34 are removed, the under plate 26 is washed to every corner while being fixed to the tilting mechanism 11 while being sprayed with water or rubbed with a brush. At the time of cleaning, there is a concern that when water is applied to the upper end surfaces of the O-ring 55 and the under plate 26, the water enters the seal groove 51. However, the O-ring 55 is in liquid-tight contact with the opening edge 52 of the seal groove 51, and the inside of the seal groove 51 is filled with the filler 57, so that water can enter from the outside. There is no space to do. Therefore, there is no possibility that water will enter the seal groove 51. Further, since the filler 57 is always sealed by the O-ring 55, there is no possibility that the filler 57 leaks out of the seal groove 51 and enters the center or the coating agent in the coating tank 25.

  Further, there is a concern that the O-ring 55 may come off from the seal groove 51 when the O-ring 55 is rubbed with a brush or the like. However, the seal groove 51 has a trapezoidal cross section, and the O-ring 55 is in close contact with the opening edge 52 which is the minimum width of the seal groove 51, and this close position is a position above the maximum outer diameter portion 56 of the O-ring 55. In addition, since the maximum outer diameter portion 56 of the O-ring 55 is accommodated in the seal groove 51, there is no possibility that the O-ring 55 is detached from the seal groove 51.

  In the process of assembling the spacer 34 to the under plate 26 and the process of assembling the drum 28 to the spacer 34, the O-ring 55 is elastically deformed while maintaining the state in contact with the inner surface of the seal groove 51. Accordingly, even if water adheres to the upper end portion of the O-ring 55 or the upper end surface of the under plate 26 with the spacer 34 removed from the under plate 26, the attachment of the spacer 34 in the process of assembling the spacer 34 to the under plate 26. There is no possibility that the water that has been infiltrated into the seal groove 51. Similarly, even if water adheres to the upper end portion of the O-ring 55 and the upper end surface of the spacer 34 with the drum 28 removed from the spacer 34, it adheres in the process of assembling the drum 28 to the spacer 34. There is no possibility that the water enters the seal groove 51.

<Example 2>
Next, a second embodiment of the present invention will be described with reference to FIG. In the coating apparatus A of the first embodiment, the coating tank 25 includes the under plate 26, the spacer 34, the drum 28, and the disk 38. However, the coating tank 60 of the coating apparatus B of the second embodiment includes , The spacer 34 is not provided, and the drum 28 (cylindrical member described in the claims) is directly placed and assembled on the upper end surface of the under plate 26. Since the other configuration and the structure of the sealing means 50 by the seal groove 51 and the O-ring 55 are the same as those in the first embodiment, the same reference numerals are given to the same configuration, and the description of the structure, operation, and effect is omitted. Omitted.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) In Examples 1 and 2, the seal groove is filled with the filler. However, the seal groove may not be filled with the filler. Even in this case, if the O-ring is always in contact with the inner surface of the seal groove, the seal groove can be reliably prevented from being flooded.
(2) In the first and second embodiments, the O-ring has a circular cross-sectional shape, but the O-ring may have an elliptical shape, an oval shape, or the like.
(3) In Examples 1 and 2 above, the material of the O-ring is made of NBR, but the O-ring is made of rubber material other than NBR, PTFE (polytetrafluoroethylene) known as a registered trademark of Teflon, etc. It may be a resin material having the following elasticity.
(4) In the first and second embodiments, the case where the present invention is applied to a coating apparatus that rotationally drives the under plate has been described. However, in the present invention, coating or rough cleaning is performed with the under plate fixed without rotating. It can also be applied to.

A ... Coating device 25 ... Coating tank 26 ... Under plate 28 ... Drum (tubular member)
34 ... Spacer (tubular member)
38 ... Disc 51 ... Seal groove 52 ... Opening edge of seal groove 55 ... O-ring 57 ... Filler L ... Tangent line circumscribing the O-ring θ ... Minimum angle formed between the upper end surface of the underplate and the tangent line of the O-ring B ... Coating device 60 ... Coating tank

Claims (5)

An under plate that forms a substantially circular dish with an outer peripheral edge raised,
A cylindrical member that has a substantially cylindrical shape whose upper and lower surfaces are open and is mounted on the upper end surface of the outer peripheral edge of the under plate;
A dish-shaped disc housed in a coating tank constructed by assembling the cylindrical member to the under plate, and capable of rotating relative to the under plate and the cylindrical member;
It is a form in which the upper end surface of the outer peripheral edge of the under plate is continuously recessed over the entire circumference, and a seal groove with a trapezoidal cross section in which the radial width dimension is minimum at the opening edge,
A coating apparatus comprising: an O-ring which is accommodated in the seal groove and is in liquid-tight contact with an opening edge of the seal groove in a state where the cylindrical member is removed from the under plate.   The coating apparatus according to claim 1, wherein the under plate and the cylindrical member are integrally rotated.   With the cylindrical member removed from the under plate, the minimum angle formed between the upper end surface of the under plate and a tangent line circumscribing a region of the O-ring that protrudes upward from the upper end surface of the under plate is The coating apparatus according to claim 1, wherein the coating apparatus has an obtuse angle.   4. The process of assembling the cylindrical member to the under plate, wherein the O-ring is elastically deformed while maintaining a state in contact with the inner surface of the seal groove. The coating apparatus according to any one of the above.   The coating apparatus according to any one of claims 1 to 4, wherein a filler is filled in the seal groove.

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