KR102312746B1 - Doule Bell-Cup with slanted spray nozzle - Google Patents

Abstract

The present invention relates to a double bell cup in which the uniformity of the paint sprayed onto the object to be painted is improved by forming an inclined spray nozzle on the inner bell cup of the double bell cup including the outer bell cup and the inner bell cup forming different spray angles. It relates to a double bell cup capable of performing more efficient coating film composition work by improving the uniformity of the coating film formed on the surface of the object to which the diagram is applied when the paint is simultaneously centrifuged into the central region and the outer peripheral region of the bell cup will be.

Description

Double Bell-Cup with slanted spray nozzle

The present invention relates to a bell cup mounted on the end of a painting robot and discharging paint, and more particularly, a spray nozzle that is inclined to the inner bell cup of the double bell cup including an outer bell cup and an inner bell cup forming different spraying angles. It relates to a double bell cup, which is formed to improve the uniformity of the paint sprayed onto the object to be painted.

In general, in a vehicle assembly process, various parts such as a door are assembled on a vehicle body, and the vehicle, in which the parts are assembled, finally performs a painting process of discharging paint to the inner and outer panels.

As shown in FIG. 1, typical painting equipment includes a painting robot 1 having a distribution pipe through which paint is circulated, a driving motor 2 installed at the end of the painting robot 1, and the driving motor and a bell cup (3) installed on the drive shaft of (2) and centrifugally spraying the paint transferred from the discharge pipe onto the object to be painted. As it is sprayed along the inner circumferential surface to the outer peripheral region of the spray hole, there is a problem in that uniform coating film formation is insufficient on the central portion of the spray hole.

Accordingly, the conventional bell cup 3 has a problem that the uniform coating film composition is overlapped 2-3 times during the painting spray operation on the object to be painted, and it has to be coated in a repetitive work process. There were problems such as color and texture degradation after coating. In addition, the conventional bell cup 3 has a high overspray ratio, which causes a significant amount of contamination and waste from the equipment, and in order to obtain a uniform coating film for the object to be painted, cost losses such as paint and thinner processes in the process of spraying 2 or 3 times overlapping, etc. There was a problem.

In order to overcome the above-mentioned problem, the present applicant in Korean Patent Publication No. 10-1634298 ('Double Bell Cup', announced on June 30, 2016), by allowing the paint to be centrifugally sprayed simultaneously into the central region and the outer peripheral region of the bell cup, to be painted, It can make the color and texture of water excellent, and it is possible to form a uniform coating film by preventing the areas where the paint is sprayed thickly on the object to be painted and the area where the coating is thinner than the standard value, and the cost is reduced by reducing the use of paint The possible double bell cup has been disclosed.

However, as shown in (a) of FIG. 2, the conventional double bell cup 10 includes one central spray hole 12-22 for spraying paint to the inner circumferential surface of the inner bell cup 12 coupled to the inside. In forming the central penetrating injection part 12-2, the central inlet hole 12-22 formed on the outer peripheral surface of the inner bell cup 12 located at the rear in the spraying direction of the paint is the center of the inner bell cup 12. It is made of a plurality including the first central inlet hole 12-22a and the second central inlet hole 12-22b provided to the outside as a reference, and in this case, the plurality of central inlet holes 12-21 is one in the front. to be merged into the central injection hole (12-22) of Due to this, when a pressure difference between the plurality of central inlet holes 12-22 is generated, the paint discharged through the single central injection hole 12-21 is not uniformly discharged, as shown in (b) of FIG. As shown, an inner central area and an outer outer peripheral area are formed based on the peak point (K) of the paint applied to the surface of the object 4 to be painted, and at this time, the height of the peak point (K) of the paint The uniformity of (Lk) is reduced.

Korean Patent Publication No. 10-1634298 ('Double Bell Cup', 2016.06.30. Announcement)

The present invention was devised to solve the above problems, and in a double bell cup that centrifugally sprays paint into the central region and the outer peripheral region of the bell cup at the same time, it improves the uniformity of the coating film formed on the surface of the object to which the diagram is applied, An object of the present invention is to provide a double bell cup capable of performing a more efficient coating film composition operation.

In order to solve the above problems, the present invention is a double bell cup including an outer bell cup and an inner bell cup installed at the end of a painting robot to centrifugally spray paint onto a material to be painted, and form different spraying angles, the inner The bell cup is formed in a tapered structure in which the diameter of the inner circumferential surface is opened and gradually widens toward the front in the cross section in the front-rear direction where the paint is sprayed. It is characterized in that it comprises a spray nozzle provided to be spaced apart a predetermined distance (d) in the vertical direction from the center line (CP) in the front-rear direction.

In this case, the injection nozzle is characterized in that the paint inflow angle θ formed between the center line CP and the line in the direction in which the injection nozzle communicates forms an acute angle.

In addition, the inner bell cup is detachably coupled to the inner circumferential surface in front of the outer bell cup, the inner bell cup is formed along the radial outer circumference on the outer circumferential surface of the rear, the fitting projection coupled to the inner circumferential surface of the outer bell cup and the fitting A plurality of outer peripheral communication holes formed along the perimeter of the stagnant passage and the fitting protrusion formed at the rear of the inner bell cup in a radially inner side of the protrusion to communicate the stagnant passage and the inner circumferential surface of the outer bell cup further comprising: characterized.

In addition, the injection nozzle is a plurality of inlets formed on the outer peripheral surface of the rear portion of the inner bell cup, a plurality of outlets formed on the inner peripheral surface of the front portion of the inner bell cup, and each one of the inlets and outlets of the plurality of inlets and outlets to communicate It is characterized in that it includes a plurality of communication paths forming a single flow path.

In addition, the plurality of injection nozzles connect the center of the inner bell cup and are formed in a radial direction spaced apart from each other by a predetermined distance (ti, to) based on a center line (cp) extending in the vertical direction.

In addition, the inner bell cup has an end (Pn) on the inner circumferential surface on which the paint moves so that the paint is discharged from the discharge portion of the plurality of injection nozzles and is centrifugally sprayed downward from the center (P1) of the inner peripheral surface where the discharge portions of the plurality of injection nozzles are formed. In the direction facing, the angle (a) formed by the tangent at any point on the inner circumferential surface and the center line Cp extending in the vertical direction passing through the center P1 of the inner circumferential surface is formed to form a single curvature that gradually decreases characterized.

In addition, a line connecting in the vertical direction a center line (CP) extending and formed connecting the center of the outer bell cup and the center of the inner bell cup and the inner circumferential surface of the outer bell cup on which the paint discharged radially outward from the stagnant path moves The angle bo formed by (L1) extends in the vertical direction along the center line CP and the inner peripheral surface of the inner bell cup through which the paint discharged forward from the injection nozzle of the inner bell cup moves. ) is formed to be larger than the angle (bi) formed, and the outer diameter (Lo) of the outer bell cup is formed to be larger than the outer diameter (Li) of the inner bell cup, so that the paint stagnant in the stagnation path is in communication with the injection nozzle and the outer circumference It is characterized in that the centrifugal spray is respectively passed through the hole to the central area and the outer peripheral area of the spray area to the object to be painted.

At this time, the Singhi paint inflow angle θ may be formed to form an angle of 5° to 40°, and preferably, an angle of 10° to 30°.

In addition, the separation distance (di) formed by the plurality of inlets from the center line (cp) extending in the vertical direction connecting the centers of the inner bell cups may be formed to form a length of 1 ~ 10 mm, preferably 1 ~ It may be formed to achieve a length of 5 mm.

In addition, the diameter of the plurality of injection nozzles may be formed to be 0.1 ~ 3mm, preferably 0.4 ~ 2.5mm, more preferably 0.5 ~ 1.5mm.

At this time, the plurality of injection nozzles are preferably formed to form 2 to 10 in the plurality, preferably 3 to 8 in the odd number, and 4 to 8 in the even number.

The present invention according to the above configuration further improves the uniformity of the coating film formed on the surface of the object to which the diagram is applied in the double bell cup in which the paint is simultaneously centrifugally sprayed into the central region and the outer peripheral region of the bell cup, so that an efficient coating film composition There are advantages to being able to do the job.

1 is an exemplary view showing a painting robot in which a bell cup is typically used.
Figure 2 is a cross-sectional view showing a conventional double bell cup.
Figure 3 is a cross-sectional view showing a double bell cup of the present invention.
Figure 4 is an exploded perspective view showing a double bell cup of the present invention.
Figure 5 is a plan view showing the inner bell cup of the present invention viewed from the rear.
Figure 6 is a bottom view showing the double bell cup of the present invention viewed from the front.
7 is a partially enlarged view showing an enlarged inner bell cup according to FIG.
Figure 8 is a view for explaining the injection angle (b) of the double bell cup of the present invention.
9 is a photograph showing the surface of the object to be painted according to the conventional double bell cup and the double bell cup of the present invention.

Since the present invention may have various changes and may have various embodiments, specific embodiments will be illustrated in the drawings and detailed description will be given. However, this is not intended to limit the present invention to specific embodiments, and it should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention.

When a component is referred to as being “connected” or “connected” to another component, it is understood that the other component may be directly connected or connected to the other component, but other components may exist in between. it should be

Unless defined otherwise, all terms used herein, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

Terms such as those defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related art, and should not be interpreted in an ideal or excessively formal meaning unless explicitly defined in the present application. does not

Hereinafter, the technical idea of the present invention will be described in more detail with reference to the accompanying drawings.

Since the accompanying drawings are merely examples shown to explain the technical idea of the present invention in more detail, the technical idea of the present invention is not limited to the form of the accompanying drawings.

3 is a cross-sectional view showing a double bell cup of the present invention, and FIG. 4 is an exploded perspective view showing a double bell cup of the present invention. Referring to FIGS. 3 and 4, a double bell cup 1000 according to an embodiment of the present invention. ) is configured to include an outer bell cup 100 and an inner bell cup 200 that form different spraying angles, and may be installed at the end of the painting robot 1, more specifically, the painting robot 1 A driving motor for rotational driving is installed at the end, and may be configured to rotate the double bell cup 1000 . At this time, the outer bell cup 100 has a paint inflow path 110 receiving the paint supplied to the rear in the front-rear direction where the paint is sprayed, and the front part has a front side open to spray the supplied paint, and from the rear to the front. It is formed in a tapered structure in which the inner diameter is gradually widened to form the outer injection path 120 through which the paint is sprayed inside. In addition, an external knurling 130 for spraying the paint moving forward along the outer injection path 120 may be formed at the front end of the inner circumferential surface constituting the outer injection path 120 .

The inner bell cup 200 is coupled to the inside of the outer bell cup 100 and is configured to guide the sprayed paint to the central area in the spray area of the object to be painted toward which the double bell cup 1000 is directed, the inner bell cup 200 is a fitting protrusion 210 that is detachably coupled to the inner circumferential surface at the front of the outer bell cup 100 , is formed along the radial outer circumference on the outer circumferential surface of the rear, and is coupled to the inner circumferential surface of the outer bell cup 100 . )) is formed, radially inward of the fitting protrusion 210, the stagnation path 220 and the fitting protrusion ( A plurality of outer peripheral communication holes 211 formed along the periphery of 210 and communicated between the stagnant path 220 and the inner peripheral surface of the outer bell cup 100 and the paint on the rear outer peripheral surface of the inner bell cup 200 Including the injection nozzle 240 provided to communicate with the inner circumferential surface of the front from the rear, the paint supplied to the stagnant furnace 220 is directed toward the inner circumferential surface of the outer bell cup 100 and the inner circumferential surface of the inner bell cup 200 can be ejected to do so.

At this time, as shown in FIG. 2, the conventional inner bell cup 12 penetrates the center in the vertical direction, and the central penetrating injection portion 12-2 and the fitting protrusion communicated with the upper stagnant passage 11-2. It was formed to communicate with the stagnant path 11-2 through 12-1 and the injection path 11-3 formed along the inner peripheral surface of the outer bell cup 11, but at this time, the pressure of the paint flowing from the robot and As the discharge amount is different for each factory, it is difficult to control the amount of paint inflow, so particles of the sprayed paint may agglomerate or fail to withstand the discharge pressure and leak to the outside of the bell cup may occur.

9 is a photograph showing the surface of an object to be painted according to the conventional double bell cup and the double bell cup of the present invention, and as shown in FIG. A surface to which the paint is not sprayed is formed. This is a defect phenomenon due to the high peak point K separating the outer peripheral region and the central region is formed in the injection region to which the bell cup is directed, as shown in (b) of FIG. By using the inner bell cup 200 of the present invention to paint the surface of the object to be painted the same number of times, it was confirmed that the paint applied on the surface of the object was uniform and the effect of preventing the above-described defects was confirmed.

<Table 1: Average coating film experiment using the conventional inner bell cup and the inner bell cup of the present invention>

Table 1 shows the results of measuring the average thickness of the coating film according to the robot speed and the paint discharge amount in the same paint and the same painting robot using the conventional inner bell cup and the inner bell cup of the present invention. At this time, as shown in Table 1, in the case of the double bell cup using the inner bell cup 200 of the present invention, there are variations depending on the robot speed and the amount of paint discharged, but compared to the double bell cup using the existing inner bell cup, an average of 7 to 12% improved coating film It was confirmed that the thickness was formed.

Accordingly, the inner bell cup 200 is formed in a tapered structure in which the diameter of the inner circumferential surface is opened in a cross section in the front-rear direction where the paint is sprayed and gradually widens toward the front, the injection nozzle 240 of the inner bell cup 200 It communicates the inner circumferential surface of the front from the rear to which the silver paint is supplied, and it is preferably provided so as to be spaced apart from the center line CP in the front-rear direction forming the center of the inner bell cup 200 by a predetermined distance (d) in the vertical direction, at this time The injection nozzle 240 is formed such that the paint inflow angle θ formed by the line in the direction in which the center line CP and the injection nozzle 240 communicates forms an acute angle, and passes through the injection nozzle 240 to the front It is possible to control the amount of paint discharged by That is, when the injection nozzle 240 is vertically formed to face forward on the inner circumferential surface of the inner bell cup 200 , the amount of paint discharged through the spray nozzle 240 is the amount of the outer bell cup 100 . It is formed in a relatively large amount compared to the amount of paint discharged toward the inner circumferential surface, and thus the peak K forming the boundary between the outer circumferential area and the central area of the spray area formed on the surface of the object to be painted can be formed to be high. Accordingly, in the inner bell cup 200 of the present invention, the injection nozzle 240 is spaced apart a predetermined distance from the center line CP toward the outside in the radial direction, and the injection nozzle 240 forms the center line CP and the paint inflow. The angle θ is formed to form an acute angle, so that the amount of paint discharged through the inner circumferential surface of the outer bell cup 100 is greater than the amount of paint discharged toward the inner circumferential surface of the inner bell cup 200. At this time, it is preferable that the paint inflow angle (θ) forms an angle of 1° to 40°, and when the paint inflow angle (θ) is too large, the amount of the paint discharged through the spray nozzle 240 is On the other hand, if the paint inflow angle θ is too small, the ratio of the amount of the paint discharged through the injection nozzle 240 becomes too high, and a defect in which the peak (K) height of the coating film is increased may occur. That is, the paint inflow angle θ may be formed to form an angle of 5° to 40°, and more preferably, an angle of 10° to 30°.

Figure 5 is a plan view showing the inner bell cup of the present invention viewed from the rear, Figure 6 is a bottom view showing the double bell cup of the present invention viewed from the front, with reference to Figures 5 and 6, the The injection nozzle 240 includes a plurality of inlets 241 formed on the outer peripheral surface of the rear portion of the inner bell cup 200, a plurality of outlets 242 formed on the inner peripheral surface of the front portion of the inner bell cup 200, and a plurality of the inlets. It may be configured to include a plurality of communication paths 243 which communicate with each one of the inlet 241 and the discharge port 242 of the 241 and the discharge port 242 to form a single flow path, in which case the plurality of injection nozzles Reference numeral 240 connects the centers of the inner bell cups 200 and may form a radial spaced apart from each other by a predetermined distance (ti, to) based on a center line cp extending in the vertical direction. Here, the number and shape of the plurality of injection nozzles 240 may be modified into various radial polygons without departing from the gist of the present invention. At this time, the number of the injection nozzles 240 is preferably formed to form 2 to 10 in a plurality, preferably 3 to 8 in an odd number, and 4 to 8 in an even number.

In addition, the separation distance (di) formed by the plurality of inlets from the center line (cp) extending in the vertical direction connecting the centers of the inner bell cups may be formed to form a length of 1 ~ 10 mm, preferably 1 ~ May be formed to achieve a length of 5 mm, at this time, the diameter (d) of the plurality of injection nozzles 240 is 0.1 ~ 3 mm, preferably 0.4 ~ 2.5mm, more preferably to achieve 0.5 ~ 1.5mm can be formed. Here, the separation distance t of the injection nozzle 240 is due to the separation distance d of the injection nozzle 240 from the center line CP, and the injection nozzle 240 is spaced apart from the center line CP. The distance d may be due to the angle of the paint inflow θ of the injection nozzle 240 and the height in the front-rear direction of the rear portion of the inner balcup 200 .

7 is a partially enlarged view showing an enlarged inner bell cup according to FIG. 3, and FIG. 8 is a view for explaining the injection angle (b) of the double bell cup of the present invention. Referring to FIGS. 7 and 8, the inner The bell cup 200 is discharged from the discharge portion 242 of the plurality of injection nozzles 240 from the center P1 of the inner circumferential surface where the discharge portions of the plurality of injection nozzles 240 are formed, and the paint moves so as to be centrifugally sprayed downward. In the direction toward the end (Pn) on the inner circumferential surface, the angle (a) formed by the tangent line at any point on the inner circumferential surface and the center line (Cp) extending in the vertical direction passing through the center (P1) of the inner circumferential surface gradually decreases It is preferable to form a single curvature, and when the curvature forms a step on the inner circumferential surface of the inner bell cup 200, the injection angle bent downward by the centrifugal force of the inner bell cup 200 rotating at the formed step. That is, the inner bell cup 200 of the present invention according to the above-described configuration is an inner injection path ( 250) along the forward end Pn.

At this time, the inner bell cup 200 connects the center of the outer bell cup 100 and the center of the inner bell cup 200 and extends and forms a center line CP, and the inner bell cup 200 is radiated outward in the radial direction from the stagnant path 220 . The injection angle bo of the outer bell cup formed by the extension line L1 by an outer injection connecting the inner circumferential surface of the outer bell cup 100 in which the applied paint moves in the vertical direction is the center line CP and the inner bell cup 200 ) spraying angle (bi) of the inner bell cup formed by the extension line L2 by the inner injection extending in the vertical direction along the inner circumferential surface of the inner bell cup 200 in which the paint discharged forward from the injection nozzle 240 of It is formed to be larger, and it is preferable that the outer diameter (Lo) of the outer bell cup 200 is larger than the outer diameter (Li) of the inner bell cup. 240) and the outer peripheral communication hole 211, respectively, may be centrifugally sprayed onto the object to be directed toward the central region and the outer peripheral region of the spray region.

The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention as claimed in the claims.

10000 : Double Bell Cup
100: outer bell cup
110: paint inflow path 120: outside injection path
130: external knurling
200: inner bell cup
210: fitting projection 211: outer peripheral communication hole
220: Jeongjeong-ro 230: central inlet guide projection
240: injection nozzle 241: inlet
242: discharge port 243: communication path
250: inner injection path 260: inner knurling
θ : Paint inflow angle CP : Center line
a : Tangent angle Li : Inner diameter of inner bell cup
Lo : Outside bell cup inner diameter bi : Inside bell cup injection angle
bo : Outer bell cup spray angle L1 : Outer spray path extension line
L2: Extension line to the inner jet
di : separation distance between inlets ti : separation distance between inlets
do: distance between outlets to: distance between outlets
D: diameter of spray nozzle
Di : Inlet diameter Do : Outlet diameter

Claims (7)

In the double bell cup including an outer bell cup and an inner bell cup which is installed to rotate at the end of the painting robot and centrifugally sprays paint onto the object to be painted, and forms different spray angles,
The inner bell cup,
It is formed in a tapered structure in which the diameter of the inner circumferential surface is gradually widened toward the open front in the cross section in the front and rear directions where the paint is sprayed,
The injection nozzle communicates the inner circumferential surface of the front from the rear to which the paint is supplied, and is provided to be spaced apart from the center line (CP) in the front-rear direction forming the center of the inner bell cup by a predetermined distance (d) in the vertical direction;
The spray nozzle is
A plurality of inlets formed on the outer peripheral surface of the rear portion of the inner bell cup,
A plurality of outlets formed on the inner peripheral surface of the front portion of the inner bell cup, and
A plurality of communication paths, each of which communicates with one of the inlet and outlet, among the plurality of inlet and outlet to form a single flow path,
Based on the center line (CP), the paint inflow angle (θ) formed by the communication path is inclined to form an acute angle,
The injection nozzle is inclined so that the discharge port faces the inner circumferential surface of the tapered inner bell cup,
The injection nozzle comprising a single inlet and outlet is made in plurality,
A plurality of the injection nozzles,
They are radially spaced apart from each other by a predetermined distance around the center line cp,
Each outlet rather than each inlet is inclined so as to be adjacent to the center line cp,
The inner bell cup,
From the center (P1) of the inner circumferential surface toward the front end (Pn) of the inner circumferential surface, the angle (a) between the tangent line and the center line (Cp) gradually decreases in an arc shape having a single curvature, characterized in that it is bent Double Bell Cup.
delete According to claim 1,
The inner bell cup is detachably coupled to the inner circumferential surface in front of the outer bell cup,
At the rear of the inner bell cup, a stagnant path is formed in which the paint stagnates,
The inner bell cup,
A fitting projection formed along the radial outer circumference on the outer circumferential surface of the rear and coupled to the inner circumferential surface of the outer bell cup,
A plurality of outer peripheral communication holes formed along the circumference of the fitting protrusion to communicate with the stagnant passage and the inner peripheral surface of the outer bell cup,
Double bell cup, characterized in that it further comprises. delete delete delete delete

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