JP5425730B2 - Viscous material application nozzle - Google Patents

Description

  The present invention relates to a nozzle for applying a viscous material such as ink or paint.

When a sealing material is applied to a workpiece having a different application width of the sealing material depending on the part, the sealing material is applied by appropriately switching to a nozzle having an opening corresponding to the application width. In addition, the viscosity of a viscous material such as a sealing material changes due to a temperature change, and the amount of application varies, and the application width becomes uneven.

In Patent Document 1, the movement of the first piezoelectric element that expands and contracts in the length direction of the nozzle is changed to the movement in the radial direction via a pair of wedge members, and the nozzle diameter is changed by the movement in the radial direction. The nozzle diameter is adjusted according to the above, and the fine adjustment of the nozzle diameter is performed by the second piezoelectric element that expands and contracts in the radial direction to finely adjust the coating amount according to the temperature change.

JP-A-10-156250

In the nozzle disclosed in Patent Document 1, a viscous material enters between a pair of wedge members and hardens, so that it cannot be applied with an accurate width. For this reason, it is necessary to periodically disassemble and clean it, but since there is a wiring for applying a voltage to the piezoelectric element, it is troublesome to remove, and it is difficult to remove the viscous material once cured.
In addition, if the cured viscous material cannot be removed, operation failure occurs, and there is a risk of explosion prevention due to operation failure, so it cannot be used in the painting booth.

In order to solve the above-mentioned problems, the invention according to claim 1 is directed to a unit holder that houses a nozzle piece configured by abutting the opening ends of two cup-shaped rotors, and the two rotors in opposite directions. A rotation mechanism that changes the area of the discharge port formed between the two rotors by rotating is used.

As the shape of the two rotors, a convex portion and a concave portion are provided at the opening end, and the convex portion of one rotor is abutted against the concave portion of the other rotor, so that the convex portion of the two rotors is A structure in which the discharge port is formed is conceivable.

Also, the angle of the step formed at the boundary between the convex and concave portions with respect to the viscous material discharge direction is an angle that becomes parallel or slightly widens as the discharge port approaches the state of forming the maximum discharge port. Thus, the viscous material can be uniformly spread over the entire coating width and discharged.

Similarly, by applying an angle with respect to the viscous material discharge direction of the step portion formed at the boundary portion between the convex portion and the concave portion so as to taper as approaching the state of forming the minimum discharge port, the application width is similarly increased. The viscous material can be uniformly spread over the entire area and discharged.

According to a fifth aspect of the present invention, there is provided a unit holder for storing a nozzle piece configured by abutting open ends of two cup-shaped rotors, and two rotors by rotating the two rotors in opposite directions. A viscous material application nozzle that discharges a viscous material with a rotation mechanism that changes the area of the discharge port formed between the rotors, wherein the internal space of the nozzle piece is inclined toward the tip of the unit holder The surface is formed as a tapered inner space which is tapered.

The inclined surface has the same width as the supply passage for supplying the viscous material to the nozzle piece, and can be formed so as to be continuously provided through a concave portion forming a discharge port and a curved surface.

The rotating mechanism includes a pair of oscillating rods whose front ends engage with the respective rotors, a rotating plate engaged with the base ends of the pair of oscillating rods, and a driven gear fastened integrally with the rotating plate, The rack gear meshes with the driven gear.

According to the present invention, since the member directly involved in opening and closing the discharge port does not include an electrical member such as a piezoelectric element, malfunction does not easily occur, and even if malfunction occurs, problems such as explosion prevention do not occur.
Moreover, since the mechanism is simple and can be easily disassembled and assembled, it is excellent in maintainability and easily removes hardened viscous materials.

Furthermore, when applying a viscous material to a workpiece having a different application width of the viscous material depending on the part, it is possible to continuously apply a viscous material having an appropriate application width while changing the opening area of the discharge port as needed.
Further, since the opening area of the discharge port can be finely adjusted accurately, a paint having a large viscosity change due to a temperature change can be applied by a predetermined amount and with a predetermined width.

The top view which notched and showed a part of 1st Embodiment of the viscous material application nozzle which concerns on this invention Viewed from direction A in FIG. Viewed from direction B in FIG. Plan sectional drawing of 1st Embodiment of the viscous material application | coating nozzle which concerns on this invention The perspective view of the unit holder of 1st Embodiment of the viscous material application nozzle which concerns on this invention View of the unit holder from the back (A) is sectional drawing of the nozzle piece accommodated in a unit holder, (b) is an exploded view of a nozzle piece. (A) is a front view of the nozzle piece in a state where the discharge port is narrowed, and (b) is a front view of the nozzle piece in a state where the discharge port is widened. (A) is an enlarged view of the unit holder in a state where the discharge port is narrowed, and (b) is an enlarged view of the unit holder in a state where the discharge port is widened. Sectional drawing of 2nd Embodiment of the viscous material application nozzle which concerns on this invention The top view of 2nd Embodiment of the viscous material application nozzle which concerns on this invention AA line sectional view of FIG. The figure seen from the B direction of FIG. EE sectional view of FIG. Exploded view of FIG. FF sectional view of FIG.

Embodiments of the present invention will be described below with reference to the drawings. 1st Embodiment of the viscous material application | coating nozzle which concerns on this invention is provided with the unit holder 1 and the rotation mechanism 2, as shown in FIGS. A nozzle piece 3 is accommodated in the unit holder 1, and this nozzle piece 3 is configured by abutting the open ends of two rotors 4 and 4 having a cup shape.

  The rotating mechanism 2 includes a driven gear 7 that is rotatably provided around a cylindrical body 5 that is inserted and held in the unit holder 1, a drive gear 8 that meshes with the driven gear 7, and a pair of spur gears 6 that form a fan shape. 6, the drive gear 8 meshes with the driven gear 7 provided around the cylindrical body 5, and the spur gears 6, 6 mesh with the opposite positions of the driven gear 7 so as not to interfere with the drive gear 8. Yes.

  The center of rotation of the spur gears 6 and 6 is engaged with engagement pieces 9 and 9 formed on the opposite side of the open ends of the two rotors 4 and 4. Accordingly, when the drive gear 8 is rotated by an amount corresponding to a change in the application width of the viscous material application site or a temperature change by a motor or the like, the cylinder 5 meshed with the drive gear 8 is rotated, and this cylinder 5 The spur gears 6 and 6 meshing with the driven gear 7 rotate in opposite directions, and as a result, the two rotors 4 and 4 rotate in opposite directions. As the rotors 4 and 4 rotate, the opening area of the discharge port changes as will be described later.

The inside of the cylinder 5 serves as a supply passage 10 for a viscous material such as paint, and the viscous material is fed into the internal space 11 of the rotors 4 and 4 through the supply passage 10.

On the other hand, as shown in FIG. 5, an opening 12 is formed in the front surface of the unit holder 1 so that the side surface of the nozzle piece 3 is exposed. To store the nozzle piece 3 in the unit holder 1, as shown in FIG. Then, the cover plate 13 is removed from the unit holder 1, and the two rotors 4, 4 are accommodated in the cylindrical recess 14 formed in the unit holder 1 with their respective open ends abutted against each other. Install.

The nozzle piece 3 (rotors 4, 4) is housed in the unit holder 1, and the engagement piece 9 of one rotor 4 is attached to the lid plate 13 in a state where the lid plate 13 is fixed to the unit holder 1 with bolts 15. The engaging piece 9 of the other rotor 4 protrudes from the opening 17 formed on the bottom surface of the unit holder 1.

  A convex portion 19 and a concave portion 18 are provided along the periphery at the opening end of the cup-shaped rotor 4, and the convex portion 19 of one rotor 4 is abutted against the concave portion 18 of the other rotor 4, A discharge port 20 is formed between the convex portions 19 of the two rotors. The center of the discharge port 20 is set to coincide with the center line (axis line) of the viscous material supply passage 10.

  The angle of the stepped portion 21 formed at the boundary between the convex portion 19 and the concave portion 18 with respect to the viscous material discharge direction, that is, the angle with respect to the center line of the supply passage 10 of the viscous material is determined by the two rotors 4 and 4 rotating. Then, the opening area of the discharge port 20 is enlarged to become the maximum opening area, and the tip opening is widened in the closed state shown in FIG. 9B, and the opening area of the discharge port 20 is reduced to the minimum opening area. The angle is set to be tapered in the state shown in FIG.

In the above, even when a viscous material is applied in an appropriate width even for a workpiece having a different application width of the viscous material depending on the part, the two rotors 4 and 4 are connected via the rotation mechanism 2 by an amount set in advance by a control device (not shown). Is rotated in the opposite direction by a predetermined amount to finely adjust the opening area of the discharge port 20.
Further, the temperature of the viscous material is detected by a temperature sensor (not shown), the viscosity of the temperature is calculated based on a calibration curve or the like, and the two rotors 4, 4 are connected via the rotating mechanism 2 by an amount corresponding to the calculated value. 4 is rotated in the opposite direction by a predetermined amount to finely adjust the opening area of the discharge port 20.

The viscous material to which the nozzle of the present invention is applied includes a gas or liquid such as water for the purpose of cleaning or the like. Further, in the first embodiment of the present invention, a combination of a pair of spur gears, a driven gear, and a driving gear that form a fan shape is used as the rotation mechanism, but a link or the like can also be used.

In the first embodiment of the present invention, the angle of the stepped portion formed at the boundary between the convex portion and the concave portion with respect to the viscous material discharge direction is adjusted as the discharge port approaches the state of forming the maximum discharge port. Viscosity over the entire coating width by making the angle with respect to the viscous material discharge direction of the step portion taper as it approaches the state where the minimum discharge port is formed. Although the material is uniformly spread and discharged, the angle of the stepped portion with respect to the viscous material discharge direction can be appropriately changed depending on the viscosity of the viscous material.

  Next, 2nd Embodiment of the viscous material application | coating nozzle which concerns on this invention is provided with the unit holder 31 and the rotation mechanism 32, as shown in FIGS. A nozzle piece 33 is accommodated in the unit holder 31, and this nozzle piece 33 is configured by abutting the open ends of two rotors 34, 34 having a cup shape. The rotation mechanism 32 rotates the two rotors 34 and 34.

As shown in FIGS. 14 to 16, a convex portion 49 and a concave portion 48 are provided along the peripheral edge at the opening end of the cup-shaped rotor 34, and the convex portion 49 of one rotor 34 rotates to the other. By abutting against the concave portion 48 of the child 34, the discharge port 50 is formed between the convex portions 49, 49 of the two rotors 34, 34. When the rotation mechanism 32 rotates the two rotors 34 and 34, the opening area of the discharge port 50 changes. A step 51 is formed at the boundary between the convex portion 49 and the concave portion 48.

  The inner space 41 of the nozzle piece 33 formed by abutting the convex portions 49 and the concave portions 48 of the two rotors 34 and 34 is tapered by an inclined surface 30 that is inclined toward the tip of the unit holder 31. Is formed. The base end of the inclined surface 30 is formed to have the same width as the supply passage 40 of the cylindrical body 35, and the distal end of the inclined surface 30 forms a curved surface continuously connected to the concave portions 48 and the convex portions 49 of the rotors 34 and 34. Reference numeral 43 denotes a cover plate that accommodates the two rotors 34 and 34 in a cylindrical concave portion 47 formed in the unit holder 31 with their respective open ends abutted against each other, and then is attached.

  With such a configuration, the viscous material supplied to the internal space 41 of the nozzle piece 33 via the supply passage 40 is rectified and discharged from the discharge port 50 toward the workpiece. For this reason, a turbulent flow is generated in the viscous material supplied to the internal space 41 through the supply passage 40, thereby preventing pulsation when the viscous material is discharged from the discharge port 50 and preventing so-called beach mark defects. Can do.

  The rotating mechanism 32 that rotates the two rotors 34, 34 is engaged with a pair of rocking rods 36 whose tips are engaged with the rotors 34, and base ends of the pair of rocking rods 36. The rotating plate 37 includes a driven gear 38 that is fastened integrally with the rotating plate 37, a rack gear 39 that meshes with the driven gear 38, and the like.

The two rotors 34, 34 have the swing rods 36 inserted into the engagement pieces 42, 42, respectively, and the base ends of the swing rods 36 are engaged with the engagement recesses 37 a of the rotary plate 37. Further, the rocking rod 36 is inserted with a split pin 53 for preventing it from coming off from the rotating plate 37.

  A cylindrical portion 44 is connected and fixed to one surface of the rotating plate 37, and a cylindrical body 35 having one end screwed into the unit holder 31 is fitted into the through hole of the rotating plate 37 and the cylindrical portion 44. In addition, a cylindrical portion 45 is integrally formed on one surface of the driven gear 38 facing the rotating plate 37, and a through hole is formed in the driven gear 38 coaxially with the cylindrical portion 45.

  The cylindrical portion 44 in which the cylindrical body 35 is inserted is inserted into the through hole of the driven gear 38 and the cylindrical portion 45, and the cylindrical portion 44 and the cylindrical portion 45 are fastened together by a fastening bolt 46 to be integrated. The driven gear 38 meshes with a rack gear 39 disposed on one side thereof.

  Under such a configuration, the rack gear 39 is moved back and forth to rotate the driven gear 38 left and right, and the rotation of the driven gear 38 rotates the rotating plate 37 around the cylindrical body 35. The rocking rod 36 can be swung by the rotation of the rotating plate 37, and the two rotors 34 can be rotated by the same angle in opposite directions by the rocking of the rocking rod 36. Therefore, the opening area of the discharge port 50 can be set to a desired size by adjusting the amount of movement of the rack gear 39 before and after.

  With this configuration, the configuration of the rotation mechanism 32 becomes very simple and the weight is reduced. Further, the driven gear 38 and the rack gear 39 can be disposed rearward from the discharge port 50, and it is possible to prevent the viscous material from adhering to the gear system and causing malfunction.

According to the present invention, since the mechanism is simple and can be easily disassembled and assembled, the maintenance is excellent, and the member directly involved in opening and closing the discharge port does not include an electrical member such as a piezoelectric element. Therefore, it is possible to provide a viscous material application nozzle that is difficult to cause and does not cause problems such as explosion-proof even if malfunction occurs.

DESCRIPTION OF SYMBOLS 1,31 ... Unit holder, 2,32 ... Rotation mechanism, 3,33 ... Nozzle piece, 4,34 ... Rotor which comprises nozzle piece, 5,35 ... Cylindrical body, 6 ... Fan-shaped spur gear, 7 ... Driven gear , 8 ... Drive gear, 9, 42 ... Engagement piece, 10, 40 ... Supply passage for viscous material, 11, 41 ... Internal space, 12 ... Opening of unit holder, 13, 43 ... Cover plate, 14, 47 ... Cylindrical Concave portion, 15 ... bolt, 16, 17 ... opening, 18, 48 ... concave portion, 19, 49 ... convex portion, 20,50 ... discharge port, 21,51 ... step portion, 30 ... inclined surface, 36 ... rocking rod 37... Rotating plate 38... Driven gear 39. Rack gear 44. Tube portion 45.

Claims (7)

In a viscous material application nozzle that discharges a material whose viscosity changes depending on temperature, such as paint, a unit holder that houses a nozzle piece configured by abutting the opening ends of two cup-shaped rotors, and the two rotors And a rotating mechanism for changing the area of the discharge port formed between the two rotors by rotating them in opposite directions. In the viscous material application nozzle according to claim 1, a convex portion and a concave portion are provided at the opening ends of the two rotors, and the convex portion of one rotor is abutted against the concave portion of the other rotor, A viscous material application nozzle, wherein a discharge port is formed between convex portions of two rotors. The viscous material application nozzle according to claim 1, wherein an angle of the stepped portion formed at a boundary portion between the convex portion and the concave portion with respect to the viscous material discharge direction is an angle which is widened in a discharge state. Viscous material application nozzle. 2. The viscous material application nozzle according to claim 1, wherein an angle of the stepped portion formed at a boundary portion between the convex portion and the concave portion with respect to the viscous material discharge direction is an angle that is tapered in a closed state. Viscous material application nozzle. A unit holder that houses a nozzle piece configured by abutting the open ends of two cup-shaped rotors, and a discharge formed between the two rotors by rotating the two rotors in opposite directions. A viscous material application nozzle that discharges a viscous material with a rotation mechanism that changes the area of the outlet, wherein the internal space of the nozzle piece is tapered with an inclined surface that is inclined toward the tip of the unit holder. A viscous material application nozzle characterized by being formed as follows. 6. The viscous material application nozzle according to claim 5, wherein the inclined surface has the same width as a supply passage for supplying the viscous material to the nozzle piece and a base end side, and is continuously provided through a concave portion and a curved surface forming a discharge port. A viscous material application nozzle formed so as to be 7. The viscous material application nozzle according to claim 5, wherein the rotation mechanism includes a pair of swing rods whose front ends engage with the rotors, and a rotary plate that engages with the base ends of the pair of swing rods. And a driven gear that is fastened integrally with the rotating plate, and a rack gear that meshes with the driven gear.

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