KR101562639B1 - Method for coating object with insulating material - Google Patents

Abstract

More specifically, the present invention relates to a method of insulative coating of a fastening object, and more particularly, to a method of insulative coating of a fastening object by sequentially heating a fastening object having a head part and a body part, To an insulating coating method of a fastening object which can improve the coating quality by allowing the material to be stably coated.
The present invention provides an insulating coating method using a coating apparatus, comprising: a supplying step of supplying an object to be fastened having a body part and a head part provided at one end of the body part; A gripping step of gripping an object to be fastened supplied in the supplying step; A first coating step of heating the head part of the fastening object to a predetermined first temperature and coating the head part with a coating material; And a second coating step of heating the body portion of the object to be fastened to a predetermined second temperature and covering the body portion with a coating material.

Description

METHOD FOR COATING OBJECT WITH INSULATING MATERIAL FIELD OF THE INVENTION [0001]

More specifically, the present invention relates to a method of insulative coating of a fastening object, and more particularly, to a method of insulative coating of a fastening object by sequentially heating a fastening object having a head part and a body part, To an insulating coating method of a fastening object which can improve the coating quality by allowing the material to be stably coated.

Screws (e.g., screws, bolts, etc.), nuts, or rivets are generally used to join two or more plates or mechanical parts.

The object to be fastened such as a screw or a rivet (herein, a fastening object means a fastening object to be subjected to a coating process on the basis of a coating device) includes a body portion passing through two or more plate members or mechanical parts, And a head part provided at one end of the body part, and a coating technique for coating the surface of the object to be fastened with the coating material to provide an additional function or to improve the surface quality has already been known.

The coating material used in the coating method of the fastening object is determined according to the object to be coated or the object of coating. For example, a fastening object such as a screw or a rivet has a function of preventing leakage, leakage, Lt; RTI ID = 0.0 > of < / RTI >

The coating apparatus of the fastening object and the coating method using the fastening object according to the prior art are configured to coat the body of the fastening object with a powdery or liquid coating material, and when using the powdery coating material, the coating material is deposited A heating unit for heating the object to be fastened in advance is provided or used.

However, in the conventional coating apparatus and coating method, only the body portion of the fastening object is coated intensively. In the case of a fastening object used for a component using electric power, therefore, There is a risk that a leaked current may be conducted to a human body of an operator who performs an operation of tightening and unlocking the object to be fastened.

Accordingly, a need has arisen for a coating apparatus and a coating method capable of adding and / or improving insulating property to a fastening object.

Further, in order to add insulation to the object to be fastened by using the coating method using the deposition phenomenon of the powdery coating material, the head and the entire body of the fastening object should be heated. However, in general, since the thickness of the head portion is relatively smaller than the diameter (or thickness) of the body portion, when the object to be fastened is heated using the heating portion of the coating apparatus according to the prior art, the heating speed of the head portion and the heating There is a problem in that the final coating quality is not uniform due to a temperature gradient at the final heating temperature of the head and the final heating temperature of the body when heated for the same time due to the difference between the speeds.

In addition, according to the related art, when a coating material is coated on an object to be fastened, the coating material flows into a portion where coating is not required, thereby deteriorating the coating quality of the fastening object.

In addition, according to the prior art, when the powdery coating material such as nylon powder is stored at room temperature for a long time, the powdery coating material is exposed to moisture, and the coagulation of the coating material occurs. In order to prevent the coagulation phenomenon of the coating material due to the above-mentioned moisture when the powder coating material is stored for a long time, there is a problem that the coating material is kept at a temperature higher than room temperature Despite the need to store, the coating process according to the prior art does not have any configuration for keeping the coating material in a closed state above normal temperature.

KR 10-2009-0061129 A

The object of the present invention is to solve the conventional problems as described above, and it is an object of the present invention to provide an apparatus for fastening a fastening object having a head part and a body part to two parts of a head part and a body part, And to provide an insulating coating method capable of improving coating quality by allowing a coating material to be stably coated on the substrate.

Another object of the present invention is to provide an insulating coating method capable of improving coating quality of an object to be fastened by preventing a coating material from flowing into a portion where a coating material is not required when a coating material is coated on an object to be fastened .

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According to an aspect of the present invention, there is provided an insulating coating method using a coating apparatus, comprising: a supplying step of supplying a fastening object having a body part and a head part provided at one end of the body part; A gripping step of gripping an object to be fastened supplied in the supplying step; A first coating step of heating the head part of the fastening object to a predetermined first temperature and coating the head part with a coating material; And a second coating step of heating the body portion of the object to be fastened to a predetermined second temperature and covering the body portion with a coating material.

Preferably, the first coating step includes a first heating step of heating the head of the fastening object; And a first spraying step of spraying the coating material onto at least a part of the side surface of the head part of the fastening object heated in the first heating step and a lower surface thereof.

Preferably, the gripping step is carried out such that the gripping portion of the gripping unit included in the coating apparatus grips the upper surface of the head portion of the fastening object, and the first coating step is performed during the first coating step And a rotating step of rotating the gripping object gripped by the gripping part and the gripping part.

Preferably, the first coating step further includes a first air spraying step of spraying air to form an air curtain on a side surface of the head part.

Preferably, the first air injection step is performed during the execution time of the first injection step from before the first injection step, or from the end of the first injection step to the end of the first injection step Is executed for a preset time, or is executed simultaneously with the first injection step.

Preferably, the first coating step further includes a first collecting step of collecting residual coating material that is not deposited on the head of the fastening object after being sprayed in the first spraying step .

Preferably, the second coating step includes a second heating step of heating the body portion of the fastening object; And a second spraying step of spraying the coating material onto the body part heated in the second heating step.

Preferably, the gripping step is carried out such that the gripping part of the gripping unit included in the coating apparatus grips the upper surface of the head part of the fastening object, and the second coating step is performed during the second coating step And a rotating step of rotating the gripping object gripped by the gripping part and the gripping part.

Preferably, the second coating step further includes a second air spraying step of spraying air to form an air curtain on a side surface of one end of the body.

Preferably, the second air injection step is executed during the execution time of the second injection step from before the second injection step, or from the end of the second injection step to the end of the second injection step Is executed for a preset time, or is executed simultaneously with the second injection step.

Preferably, the second coating step further includes a second collecting step of collecting residual coating material that is not deposited on the body of the fastening object after being sprayed in the second spraying step .

Preferably, the predetermined first temperature is higher than the predetermined second temperature.

Preferably, the method further includes a rotation transfer step of rotating and transferring the fastening object on a horizontal plane so that the fastening object sequentially passes through the first coating step and the second coating step after the holding step .

Preferably, the gripping step is carried out so that the gripping portion of the gripping unit included in the coating apparatus grips the upper surface of the head portion of the fastening object, and the insulating coating method is performed such that the gripping step and the first coating And aligning the fastening object so that the center of the head of the fastening object is positioned at the center of the gripping surface of the gripping part during the gripping step.

Preferably, the method further includes a removing step of removing the fastening object held in the holding step after the second coating step.

Preferably, the method further includes a washing step of washing the holding surface on which the object to be fastened was held in the holding step after the removing step.

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According to the means for solving the above-mentioned problems, the present invention has the following effects.

First, the fastening object according to the present invention includes a first coating portion and a second coating portion, so that when the fastening object is fastened to couple two or more parts, an object to be fastened and the two or more parts are electrically It is possible to prevent the contact, so that it is possible to improve the stability for the worker performing the work on the object to be fastened.

In general, when the diameter of the head portion and the diameter of the body portion are different from each other in the fastening object having the head portion and the body portion, when the heat of the same temperature is applied to the entire object to be fastened, A temperature gradient is generated between the final temperature of the body part and the final temperature of the head part. Such a temperature gradient may cause a problem that the coating material may not be uniformly coated on the head part and the body part, The object to be fastened is divided into two parts, that is, a head part and a body part, which have different diameters, and sequentially heated to cover the coating material so that the coating material can be coated with a stable and uniform thickness on the object to be fastened, The coating quality can be remarkably improved.

In addition, the present invention includes an air jetting step in the coating step, so that when the coating material is coated on the object to be coated, the coating material flows into a portion where coating is not required (e.g., a driver groove in the case of a screw) Therefore, it is possible not only to significantly reduce the defective rate of the object to be fastened, but also to improve the coating quality of the fastening object.

In addition, the present invention includes a recovery step after the coating material injection step to recover the remaining coating material that has not been coated on the surface of the fastening object after being sprayed in the spraying step, It is possible to reduce the amount of coating material used and save manufacturing cost.

In this case, according to the present invention, since the vacuum suction unit is further provided in the recovery step, the coating material falling down to the recovery unit can be reliably recovered, and a certain portion or the entire remaining coating material falling outside the range of the recovery unit can be sucked into the recovery unit Therefore, it is possible to improve the recycling efficiency of the remaining coating material, and further, the amount of the remaining coating material falling on the bottom of the coating work space according to the coating method according to the present invention can be minimized, Can be provided.

In addition, since the present invention has a heat transfer surface inside a supply part containing a coating material in a supply step, when the coating material is stored or used at room temperature, it is possible to prevent the coagulation phenomenon of powdery coating material from occurring even when exposed to moisture The coating material, which is a powder, can be stored in an optimum state, thereby improving the shelf life of the coating material and further enabling smooth operation of the coating process.

Further, according to the present invention, by including the aligning step, the coating process for the fastening object can be performed while the fastening object is always aligned with the center of the gripping surface of the gripping unit, Since the coating material is coated while being rotated concentrically with the rotation axis of the holding unit, the coating quality of the fastening object can be improved or uniformed over the entire surface.

Further, the present invention includes a removal step so that the object to be fastened can be easily removed and stored in the holding unit by using a simple structure.

In addition, since the present invention includes a cleaning step, it is possible to keep the holding surface of the grip unit continuously used in the subsequent coating process in a clean state, so that the coating material remaining in the previous coating process So that it is possible to remarkably reduce the defective rate of the object to be fastened.

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1 is a plan view showing a preferred embodiment of a coating apparatus according to a first aspect of the present invention.
2 is an enlarged plan view of a portion indicated by an arrow A in Fig.
Fig. 3 is a view along the line BB in Fig.
FIG. 4 is a plan view showing a part of the rotary table cut out to show a state in which the rotating guide unit and the roller of the holding unit are in contact with each other in FIG. 2, wherein the rotating guide unit and the roller of the holding unit according to the first embodiment are in contact with each other Fig.
Fig. 5 is a view from the direction of arrow E in Fig. 4, showing the rotating guide unit according to the first embodiment.
Fig. 6 is a plan view showing a modified embodiment of Fig. 4, in which the rotating guide unit according to the second embodiment is in contact with the rollers of the gripping unit. Fig.
Fig. 7 is a view from the direction of arrow F in Fig. 6, showing the rotating guide unit according to the second embodiment.
8 is a view along the line CC in Fig.
9A is a view showing a state in which the head of the fastening object is heated by the first heating member and FIG. 9B is a view showing a state in which the body of the fastening object is being heated by the second heating member .
FIG. 10 is a view along the DD line of FIG. 2. FIG.
11 is a view showing a state in which the first injection portion operates on the head portion of the fastening object.
12 is a view showing a state in which the second injection portion operates on the trunk portion of the object to be fastened.
FIG. 13A is a view showing a state before a coating material is coated on a fastening object, FIG. 13B is a view showing a state where a coating material is coated on a head of a fastening object, and FIG. Fig. 5 is a view showing a state in which a coating material is coated on the head and the body of the object.
14 is a view showing an operating state of the detaching unit in the coating apparatus according to the first aspect of the present invention.
15 is a view showing an operating state of the cleaning unit in the coating apparatus according to the first aspect of the present invention.
16 is a view schematically showing a coating material spraying apparatus according to a second aspect of the present invention.
FIG. 17 (a) is a graph showing a change in surface temperature of an object to be fastened when a coating material is sprayed without mounting an air heating part in the coating material spraying apparatus according to the second aspect of the present invention, and FIG. 17 FIG. 3 is a graph showing changes in surface temperature of an object to be fastened when an air heating unit is mounted and a coating material is sprayed in a coating material injecting apparatus according to a second aspect of the present invention.
18 is a view showing a coating material supply apparatus according to a third aspect of the present invention.
19 is a view showing the use state of the coating material dispersing unit in the coating material supplying apparatus according to the third aspect of the present invention.
FIG. 20 is a schematic process flow diagram of a method for insulative coating of a fastening object according to the present invention. FIG.

Hereinafter, preferred embodiments of the coating apparatus according to the first aspect of the present invention will be described in detail with reference to the accompanying drawings. It is to be understood that the terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms and that the inventor should properly interpret the concepts of the terms to best describe their invention It should be construed as meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined. In addition, since the embodiments described in the present specification and the configurations shown in the drawings are only the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention, It is to be understood that equivalents and modifications are possible.

1 is a plan view showing a preferred embodiment of a coating apparatus according to a first aspect of the present invention.

A coating apparatus according to a preferred embodiment of the present invention includes a rotary table 10 rotatably provided on a support frame 5 as shown in FIG. 1; A gripping unit (1) for gripping a fastening object (1) having a body part and a head part provided at one end of the body part, the gripping part being provided at a plurality of positions which are capable of rotating at regular intervals along the outer peripheral surface of the rotary table (20); A supply unit (50) provided adjacent to the outside of the rotary table (10) for supplying the fastening object (1) to the gripping unit (20); A first coating unit which is provided on one side of the supply unit 50 along the rotating direction of the rotary table 10 and which heats the head part of the object 1 to be fastened to a predetermined first temperature, (70); Is provided at a predetermined distance from the first coating unit (70) along the rotation direction of the rotary table (10), and is configured to heat the body of the fastening object (1) to a predetermined second temperature, A second coating unit (80); And a control unit (not shown) for controlling units and devices included in the coating apparatus such as the rotating table, the gripping unit, the supplying unit, the first coating unit, and the second coating unit.

Here, the coating material is in the form of a powder and is made of an insulating material (e.g., nylon, etc.). Also, preferably, the coating material may include microcapsules containing an adhesive material in addition to the insulating material.

1, the rotary table 10 is formed in a disc shape and is rotatably installed on the upper portion of the support frame 5, and a rotary shaft 12 is installed in a central portion of the rotary table 10 in a vertical direction And a driving unit 14 is connected to the rotating shaft 12. Accordingly, the rotation table 10 is rotated at a constant rotation speed by the driving of the driving unit 14. [

2 is an enlarged plan view of a portion indicated by an arrow A in Fig.

The gripping units 20 are provided at a predetermined distance along the outer circumferential surface of the rotary table 10 to grip the fastening object 1 having a head and a body, And rotates 360 degrees in a state in which the fastening object 1 such as a bolt is held.

3 is a view along the line B-B in Fig.

As shown in FIG. 3, each of the holding units 20 includes a bracket 22 fixed to the outer circumferential lower surface of the rotary table 10, a magnet member 24 disposed to be rotatable relative to the bracket 22, A grip portion 26 which is provided at the tip of the magnet body 24 to grip the fastening object and which is integrally provided at the rear end of the magnet body 24 and which is in rotational contact with the belt- Roller 28 as shown in FIG.

The bracket 22 is fixed to the outer circumferential lower surface of the rotary table 10 through a plurality of fastening holes and a pair of bearings 22a for rotatably supporting the magnetic element 24 are provided in both ends of the bracket 22 .

The magnet body 24 includes an insertion portion 24a inserted into the bracket 22 and a first protrusion 24b and a second protrusion 24c protruding from both ends of the insertion portion 24a. The insertion portion 24a of the magnet body 24 is rotatably supported by the bearing 22a.

The grip portion 26 is provided at the tip end of the magnet body 24, that is, the first projection portion 24b, and is configured to detachably hold the object 1 for fastening by a magnetic force or a vacuum attraction force. As shown in FIG. 3, the gripping part includes a gripping surface for gripping the upper surface of the head of the object, and one or more magnets 26a are built in the gripping part 26, It is possible to grasp the object 1 for use. Alternatively, a vacuum suction line (not shown) may be connected to the inside of the grip portion 26 via a rotary joint (not shown) to grip the object 1 for fastening by vacuum attraction force.

The roller 28 is fixed to the rear end of the magnet body 24, that is, the second projection 24c, and is configured to be in rotational contact with the belt-shaped rotating guide unit 30. [ The roller 28 is made of a material having a frictional force and a buffering property such as urethane, rubber or the like, whereby the roller 28 can make rotational contact with the belt-shaped rotating guide unit 30 more airtight.

FIG. 4 is a plan view showing a part of the rotary table cut out to show a state in which the belt-type rotating guide unit and the roller of the gripping unit are in contact with each other in FIG. 2, in which the rotating guide unit and the roller of the gripping unit according to the first embodiment FIG. 5 is a view showing the rotating guide unit according to the first embodiment as viewed in the direction of arrow E in FIG. 4. FIG.

The belt-shaped rotating guide unit 30 according to one embodiment is constituted by a belt 34 wound between a drive pulley 31 and a plurality of driven pulleys 32, 33, as shown in Figs. 4 and 5 , And a drive motor (M) for driving the drive pulley (31) to drive the belt (34). The upper surface of the belt 34 is disposed on the path on which the roller 28 of the gripping unit 20 moves so that the roller 28 of the gripping unit 20 rotates as the rotary table 10 rotates. And the gripping portion 26 and the gripping portion 26 which are gripped by the magnet 24, the gripping portion 26 and the gripping portion 26 in association with the rotation of the roller 28, The object 1 rotates very smoothly about its axis.

A plurality of such belt-type rotating guide units 30 are provided in the lower space of the rotary table 10 to prevent interference with other components.

Preferably, the belt-shaped rotating guide unit 30 is disposed at a position corresponding to the aligning unit 60 described below at a lower edge of the rotary table 10, a position corresponding to the first coating unit, And may be disposed at corresponding positions. Therefore, when the gripping unit and the fastening object gripped by the gripping unit pass through the aligning unit, which will be described later, the gripping unit and the fastening object gripped by the gripping unit are arranged in the first It is possible to rotate the gripping unit and the fastening object gripped by the gripping unit only when the fastening object held by the gripping unit and the gripping unit passes the second coating unit when passing through the coating unit.

More specifically, as shown in Fig. 4, a belt-shaped rotating guide unit 30 is disposed on the opposite side of the aligning unit 60, which will be described later, As the object 1 rotates around the axis of the object 28 by the rotation of the roller 28 and the belt-type rotating guide unit 30, the alignment process by the aligning unit 60 proceeds very efficiently. Further, as each belt-shaped rotating guide unit 30 is arranged on the opposite side of each of the first coating unit 70 and the second coating unit 80, the belt-shaped rotating guide unit 30 is attached to the grip portion 26 of the gripping unit 20 The fastening object 1 is rotated by the first jetting section 74 and the second jetting section 84 as the belt 28 rotates about its axis by the rotational contact between the roller 28 and the belt- The coating material coating process can proceed very efficiently.

Fig. 6 is a plan view showing a modified embodiment of Fig. 4, in which the rotating guide unit according to the second embodiment is in contact with the rollers of the gripping unit, Fig. 7 is a view The rotation guide unit according to the second embodiment.

6 and 7, the rotating guide unit according to another embodiment includes a stationary rotating guide unit (not shown) having a contact member 42 disposed on a path on which the roller 28 of the gripping unit 20 moves, 40). The upper surface of the contact member 42 is formed with a contact surface 42a for contacting the roller 28 of the grip unit 20 and the contact member 42 is fixed to the support frame 5 via the mounting bracket 44 And the height of the contact member 42 is adjustably mounted on the mounting bracket 44 via an adjusting screw 46 as necessary. With this configuration, as the rotary table 10 rotates, the roller 28 of the grip unit 20 rotates 360 degrees by the rotational contact with the contact surface 42a of the contact member 42, The object 1 to be fastened to the main body 24, the gripping portion 26 and the gripping portion 26 is rotated smoothly around the horizontal axis line in association with the rotation of the grippers 28 and 28.

Since the fixed type rotating guide unit 40 does not require a separate power such as a driving motor or the like, it is possible to smoothly rotate the fastening object 1 by the grip unit 20 while reducing energy waste.

The fixed type rotating guide unit 40 is provided to prevent interference with other components in the lower space of the rotary table 10.

Preferably, the stationary rotating guide unit 40 is located at a position corresponding to the aligning unit 60 described below at a lower edge of the rotary table 10, at a position corresponding to the first coating unit, As shown in FIG. Therefore, when the gripping unit and the fastening object gripped by the gripping unit pass through the aligning unit, which will be described later, the fastening unit and the fastening object gripped by the gripping unit are moved to the first coating The gripping unit and the gripping object gripped by the gripping unit can rotate only when the gripping unit and the gripping object gripped by the gripping unit pass through the second coating unit.

6, a fixed type rotating guide unit 40 is disposed on the opposite side of the aligning unit 60 to be described later. Thus, the fastening type rotating guide unit 40 is fastened to the gripping unit 26 of the gripping unit 20, As the object 1 rotates about its axis by the rotation of the roller 28 and the stationary rotating guide unit 40, the alignment process by the aligning unit 60 proceeds very efficiently. As each fixed rotating guide unit 40 is arranged opposite to each of the first coating unit 70 and the second coating unit 80, the fastening unit 26 is fastened to the grip portion 26 of the gripping unit 20 As the object 1 rotates about its axis by the rotation contact between the roller 28 and the fixed type rotating guide unit 40, the coating material 1 by the first jetting unit 74 and the second jetting unit 84 The coating process can proceed very efficiently.

According to an alternative embodiment, the belt-type rotating guide unit 30 and the fixed rotating guide unit 40 may be installed in a mixed structure. For example, the belt-shaped rotating guide unit 30 may be arranged on the opposite side of the first jetting section 74 with the stationary rotating guide unit 40 disposed on the opposite side of the alignment unit 60. On the other hand, the stationary rotating guide unit 40 may be disposed adjacent to the first jetting section 74 in addition to the arrangement of the belt-shaped rotating guide unit 30 adjacent to the alignment unit 60.

1, a supply unit 50, an alignment unit 60, a first coating unit 70, a second coating unit 80, a detaching unit 90, The cleaning unit 100 is sequentially disposed along the rotation direction of the rotary table 10. [

The feed unit 50 includes a bowl feeder 52 for feeding the fastening object 1 to the gripping unit 20 and a linear feeder 52 for aligning the fastening object 1 fed from the bowl feeder 52 54).

2 and 3, the aligning unit 60 is provided between the supply unit 50 and the first coating unit 70 along the rotation direction of the rotary table 10, and the grip unit 20, The fastening object 1 is arranged so that the center of the head of the fastening object 1 is positioned at the center of the holding surface formed in the grip portion 26 of the fastening object 26. [

The aligning unit 60 has an aligning guide 62 for aligning the object 1 to be fastened by the rotary table 10 as shown in Fig. 10 so as to stably align the fastening object 1 attached to the grip portion 26 of the grip unit 20. [ That is, the alignment guide 62 horizontally supports the fastening object 1 gripped by the grip portion 26 of the grip unit 20 from below to prevent the fastening object 1 from swinging up and down. The alignment guide 62 is formed in an arc shape along the circumferential direction of the rotary table 10 and the alignment guide 62 is mounted on the support frame 5 via the mounting bracket 64.

1 and 2, the first coating unit 70 is disposed on one side of the supply unit 50 along the rotating direction of the rotary table 10, and the head portion of the fastening object 1 is heated A first heating portion 71 for heating the first heating portion 71; Is arranged on one side of the first heating portion 71 along the rotation direction of the rotary table 10 and is provided on at least a part of the side surface of the head portion of the object 1 to be fastened heated by the first heating portion 71, A first jetting portion (74) for jetting the coating material; .

Fig. 8 is a view along the line C-C in Fig. 2, and Fig. 9 (a) is a view showing a state in which the head of the fastening object is heated by the first heating member.

The first heating portion 71 is provided in parallel at a predetermined distance in the vertical direction at a position corresponding to the head portion 1a of the fastening object 1 gripped by the gripping unit 20, And a pair of first heating members 72a and 72b for heating the head portion 1a. As the rotary table 10 rotates, the fastening object 1 moves in the rotating direction of the rotary table 10 and passes through the clearance between the first heating members 72a and 72b. 9 (a), the head portion of the screw is connected to the first heating portion 71 of the first heating portion 71, for example, (72a, 72b). At this time, the shape of the first heating members 72a and 72b is provided so that only the head portion 1a of the object 1 can be heated.

Preferably, the first heating portion 71 may be a high-frequency induction heater. However, it is to be understood that the present invention is not limited thereto, and that other heating apparatuses can be used instead of the high frequency induction heating furnace.

Fig. 10 is a view along the line D-D in Fig. 11 is a view showing a state in which the first injection portion operates on the head portion of the fastening object.

The first jetting section 74 includes a first jetting section 74 and a second jetting section 74. The first jetting section 74 includes a first jetting section 74, And a first supply part 77 for supplying the coating material to the first injection nozzle 75 when the object 1 to be fastened passes under the first injection nozzle 75.

Preferably, the air blowing device further includes first air blowing means provided to form an air curtain on the side of the head portion 1a passing through the first jetting portion 74. The first jetting section 74 is disposed below the object 1 to be fastened through the first jetting nozzle 75 and the first jetting nozzle 75, And a first recovering unit 76 for recovering the remaining coating material that has not been deposited on the head 1a of the fastening object 1. [

11, the first injection nozzle 75 is provided so as to face the lower surface of the head portion 1a of the fastening object 1 or to face at least a part of the lower surface and the side surface, The tip of the one injection nozzle is sharpened so that at least a part of the lower surface or the lower surface and the side surface of the head portion 1a of the fastening object 1 can inject the coating material.

The first supply part 77 is formed on the inner surface as a heat transfer surface and is formed to be able to receive a coating material therein. When electricity flows to the inner surface of the first supply part 77, heat is generated on the inner surface and moisture of the coating material contained in the first supply part 77 can be removed.

11, when the coating material is sprayed onto the head part 1a of the fastening object 1 by the first injection nozzle 75, (For example, a groove into which the end portion of the driver is inserted) formed on the upper surface of the screw and the upper surface of the screw 1, which is the fastening object 1, A first air injection nozzle 78a provided at one side of the first injection nozzle 75 so as to inject air in order to inject the air into the first air injection nozzle 78a so that one end thereof is airtightly connected to the first air injection nozzle 78a, And a first air hose 78b hermetically connected to the first air hose 78b. On the other hand, the first air hose 78b is provided with an air heating portion so that when the object 1 to be fastened by the first heating portion 71 is sprayed with the air at room temperature by the first air injection nozzle 78a, It is possible to prevent the temperature of the fastening object 1 from dropping rapidly.

The first recovery unit 76 is provided below the first injection nozzle. The first recovering unit 76 is configured to recover the remaining coating material that has not been deposited on the fastening object 1 after being jetted by the first jetting nozzle 75.

Preferably, the first collecting part may include a vacuum suction part (not shown), whereby the first collecting part can more reliably recover the remaining coating material.

1, the second coating unit 80 is disposed at a predetermined distance along the circumferential direction of the rotary table on one side of the first coating unit 70 along the rotation direction of the rotary table 10. [ At this time, preferably, the predetermined distance (that is, the distance between the first coating unit and the second coating unit) is a distance at which the insulating coating layer of the head of the object coated by the first coating unit can be solidified to some extent Lt; / RTI >

The second coating unit includes a second heating unit 81 for heating the body of the object 1 to be fastened and a second heating unit 81 disposed on one side of the second heating unit 81 along the rotation direction of the rotary table 10 And a second jetting part 84 for jetting a coating material onto the body part heated by the second heating part 81.

Fig. 9 (b) is a view showing a state in which the body of the fastening object is heated by the second heating member. Fig.

The second heating portion 81 is provided parallel to the body portion of the fastening unit 20 at a position corresponding to the body portion held vertically at a predetermined interval, And a pair of second heating members 82a and 82b. As shown in Figs. 1 and 9 (b), as the rotary table 10 rotates, the fastening object 1, in which the coating material is coated only on the head part 1a of the first jetting part 74, And passes through the clearance between the second heating members 82a and 82b while moving in the rotating direction of the rotary table 10. [ The body portion 1b of the fastening object 1 can be moved in such a manner that the body portion 1b of the screw passes through the second heating members 82a and 82b of the second heating portion 81 While being heated in advance. At this time, the shapes of the second heating members 82a and 82b are provided so as to heat only the trunk portion 1b of the object 1 for fastening.

Preferably, the second heating unit 81 may be a high frequency induction heating unit. However, it is to be understood that the present invention is not limited thereto, and that other heating apparatuses can be used instead of the high frequency induction heating furnace.

When the first heating part 71 and the second heating part 81 are constituted by a high-frequency induction heating element, a voltage applied to the first heating part for heating the head part, And is preferably set to be higher than a voltage applied to the second heating unit.

On the other hand, the heating temperature of the head portion 1a of the fastening object 1 is set to be higher than the heating temperature of the trunk portion 1b of the fastening object 1. [ That is, by setting the heating temperature of the second heating part 81 to be lower than the heating temperature of the first heating part 71, the coating material can be stably and high-quality coated on the outer surface of the object 1 for fastening. When the heating temperature of the second heating part is set to be relatively lower than the heating temperature of the first heating part so that the body part having a relatively smaller thickness than the head part is heated by the second heating part, Since the indirect heating method and the difference in thickness are heated to a temperature relatively lower than the heating temperature of the body portion, the insulating coating layer of the head that has already been coated by the first coating unit is prevented from being burned while passing through the second heating portion .

12 is a view showing a state in which the second injection portion operates on the trunk portion of the object to be fastened.

The second jetting section 84 includes a second jetting nozzle 85 provided to spray the coating material toward the side of the trunk section 1b of the fastening object 1 passing through the second jetting section 84, And a second supply unit (not shown) for supplying the coating material to the second injection nozzle 85 when the fastening object 1 passes under the second injection nozzle 85. The apparatus further includes a second air injection means provided to form an air curtain on one side of the body portion 1b passing through the second jetting portion 84 (or a connecting portion between the head and the body) . The second jetting section 84 is disposed below the object 1 to be fastened through the second jetting nozzle 85 and the second jetting nozzle 85, And a second recovering unit 86 for recovering the remaining coating material that has not been deposited on the trunk portion 1b of the fastening object 1. [

12, the second injection nozzle 85 is provided so as to face the trunk portion 1b of the object 1 for fastening, and the end of the second injection nozzle 85 is connected to the trunk portion 1b of the object 1 for fastening So that the coating material can be sprayed onto the substrate.

The second supply unit (not shown) is provided on the heat transfer surface on the inner surface in the same manner as the first supply unit shown in FIG. 10, and is formed to be capable of accommodating the coating material therein. When electricity flows to the inner surface of the second supply unit (not shown), heat is generated on the inner surface and moisture of the coating material contained in the second supply unit (not shown) can be removed.

12, when the coating material is sprayed onto the trunk portion 1b of the object 1 to be fastened by the second injection nozzle 85, the second air injection means is provided on the head of the object 1 for fastening A second air injection nozzle 88a provided at one side of the second injection nozzle 85 so as to spray air to prevent the coating material from flowing into the second air injection nozzle 88a, And a second air hose 88b connected at the other end and hermetically connected to the air supply source P. On the other hand, the second air hose 88b is provided with an air heating unit so that when the object 1 to be fastened by the second heating unit 81 is sprayed with the air at room temperature by the second air injection nozzle 88a, It is possible to prevent the temperature of the fastening object 1 from dropping rapidly.

FIG. 13A is a view showing a state before a coating material is coated on a fastening object, FIG. 13B is a view showing a state where a coating material is coated on a head of a fastening object, and FIG. Fig. 5 is a view showing a state in which a coating material is coated on the head and the body of the object.

The fastening object (1) comprises a trunk part (1b); A head portion 1a provided at one end of the body portion and including a lower surface contacting one surface of one of the two components when the two components are engaged; A first coating portion covering the lower surface (or at least a portion of the lower surface and the side surface) of the head portion; And a second coating portion continuously coated on a side surface of the body portion with the first coating portion.

The first coating portion and the second coating portion are sequentially coated with the second coating portion after the first coating portion is coated first, as described above.

In this manner, the fastening object 1 is divided into two parts, that is, the head part 1a and the body part 1b, and sequentially heated to coat the coating material, the coating material can be stably coated on the fastening object 1 . That is, when the entire portion of the fastening object 1 passing through the heating portion is heated at one time as in the prior art, the diameter of the body portion 1a is relatively larger than the diameter of the head portion 1a heated later, 1b) is heated and burnt for a longer time, it is difficult to achieve a uniform coating quality.

14 is a view showing an operating state of the detaching unit in the coating apparatus according to the first aspect of the present invention.

The detaching unit 90 is provided at one side of the second coating unit 80 along the rotating direction of the rotary table 10 and is used to detach the object 1 for fastening by the gripping unit 20, 1) is in contact with the fastening object (1) so as not to move along the rotation direction of the rotary table (10); And a storage unit 96 provided at a lower portion of the detaching member 92 and storing the fastening object 1 which has been detached from the gripping unit 20 and dropped by the detaching member 92. [

As shown in Figs. 1 and 14, the coating material is coated on the second jetting portion 84 and the rotation direction of the rotary table 10 is maintained while being held by the grip portion 26 of the gripping unit 20 The object 1 to be fastened is moved to the T-shaped detachable member 92. As shown in Fig. At this time, the force applied to the fastening object 1 by the detaching member 82 contacting the fastening object 1 is a force for holding the fastening object 1 to the gripping portion 26 of the gripping unit 20, For example, stronger than the magnetic force or the vacuum attraction force, so that the fastening object 1 is detached from the grip portion 26 of the grip unit 20. [

15 is a view showing an operating state of the cleaning unit in the coating apparatus according to the first aspect of the present invention.

The cleaning unit 100 is provided on one side of the detaching unit 90 along the rotating direction of the rotary table 10 and is for cleaning the holding surface of the gripping unit 20 and includes a cleaning member 102 having a rotating brush , And the cleaning member 102 is disposed so that the brush comes into contact with the holding surface. The cleaning member 102 is connected to the motor M and is rotated by receiving power from the motor M. The brush of the cleaning member 102 is detachably installed and can be replaced after a predetermined period of time.

Hereinafter, the operation of the coating apparatus according to the preferred embodiment of the present invention will be described.

When the objects 1 to be fastened such as screws are supplied one by one from the bowl feeder 52 of the feed unit 50, the fastening objects 1 are aligned in a line by the linear feeder 54, ). The objects 1 to be fastened to the gripping portions 26 of the gripping units 20 are attached by magnetic force or vacuum attraction force as the rotary table 10 rotates and the rollers 28 of the gripping unit 20 As the object 1 to be fastened is rotated by the rotating contact with the rotating guide units 30 and 40 disposed on the opposite side of the aligning unit 60, the fastening object 1 in the aligning unit 60 The head portion 1a of the fastening object 1 is accurately aligned with the holding surface of the gripping portion 26 of the gripping unit 20 after the first heating members 72a , 72b and heated to a temperature suitable for deposition of the coating material.

Thereafter the roller 28 of the gripping unit 20 rotates with the rotating guide units 30 and 40 disposed on the opposite side of the first jetting unit 74 to rotate the fastening object 1 The powdery coating material sprayed from the first spray nozzle 75 of the first spray part 74 can be coated uniformly over the entire outer surface of the head part 1a of the object 1 for fastening. When the coating material is sprayed from the first spray nozzle 75 of the first spray portion 74, air is sprayed from the first air spray nozzle 78a of the first air spray means 78 to the object 1 to be fastened An air curtain is formed so as to prevent a coating material or foreign matter from flowing into a portion of the fastening object 1 that is not required to be coated, for example, a cross groove or an elongated groove of a screw as a fastening object 1 do.

Subsequently, the fastening object 1 is transferred to the second heating portion 81 so that the trunk portion 1b of the fastening object 1 is transferred to the second heating members 82a and 82b of the second heating portion 81 And is heated to a temperature suitable for deposition of the coating material. At this time, the heating temperature of the second heating part 81 is set to be lower than the heating temperature of the first heating part 71. [ Thereafter the roller 28 of the gripping unit 20 rotates with the rotating guide units 30 and 40 disposed on the opposite side of the second jetting section 84 to rotate the fastening object 1 The powdery coating material sprayed from the second spray nozzle 85 of the second spray part 84 can be coated uniformly over the entire outer surface of the body part 1b of the object 1 for fastening. At this time, when the coating material is sprayed from the second spray nozzle 85 of the second spray part 84, air is sprayed from the second air spray nozzle 88a of the second air spray device 88 to the object 1 to be fastened The air curtain is formed to prevent the coating material from flowing into the portion of the fastening object 1 which does not need to be coated, for example, the head 1a of the screw 1 to be fastened. The object to be fastened 1 coated with the coating material through the second coating unit 80 is detached from the gripping portion 26 of the gripping unit 20 by the detaching unit 90, That is, the gripping surface, is cleaned by the brush of the cleaning unit 100.

A preferred embodiment of a coating material spraying apparatus according to a second aspect of the present invention will now be described in detail with reference to the accompanying drawings.

16 is a view schematically showing a coating material spraying apparatus according to a second aspect of the present invention.

16, the coating material spraying apparatus according to the second aspect of the present invention receives coating material from the coating material supply unit 200 through one side and receives air from the air supply source P A mixing part 400 for mixing the coating material and air; And an injection nozzle 420 coupled to the other side of the mixing part 400 and adapted to inject the mixed coating material and air mixed in the mixing part 400 onto the coating object 1, The air supply line 310 through which the air is supplied from the supply source P to the mixing unit 400 is provided with an air heating unit 320 for heating the air to a predetermined preheating temperature.

The coating material supply unit 200 is positioned above one side of the mixing unit 400 and hermetically connected to the mixing unit 400 and the pipe 210 so that the coating material is supplied from the coating material supply unit 200 to the pipe 210, To the mixing unit 400. [0050] The coating material supply unit 200 is formed in a hemispherical shape or a circular truncated cone shape and has an inner surface as a heat transfer surface to prevent the moisture contained in the coating material contained therein Can be removed.

The air supply line 310 may be formed of an air hose. Since the air heating unit 320 is installed in the air supply line 310, the air hose is preferably made of a material having excellent heat resistance.

The air heating unit 320 includes an air flow pipe 210 provided inside the air heating unit 320 and communicating with the air supply line 310 and an air flow pipe 210 surrounding the air flow pipe 210, (Not shown) for heating the heat exchanger (not shown).

Preferably, the air flow tube 210 may be spirally disposed within the air heating portion 320.

Further, as a further embodiment, preferably, the air flow tube 210 may be arranged linearly inside the air heating part 320, and the heating wire may be spirally arranged on the inner side of the air heating part.

The predetermined preheating temperature of the air heater 320 is lower than the thermal deformation temperature of the coating material and is within a temperature range higher than normal temperature. For example, when the object to be fastened is coated to coat the object to be fastened with the coating material, the object to be fastened has a heating temperature of about 170 ° C to 180 ° C, so that the object to be fastened does not suddenly fall in temperature Air must be heated.

The mixing unit 400 includes an internal space for mixing the coating material supplied from the coating material supply unit 200 and the air heated by the air heater 320 and is heated by the injection nozzle 420 coupled to the lower end A through hole (not shown) is formed in the lower end surface so that the air-mixed coating material is discharged. As described above, since the inner surface of the coating material supply unit 200 is provided on the heat transfer surface, moisture present in the coating material in contact with the inner surface can be removed, but moisture present in the entire coating material can not be completely removed . Accordingly, by mixing the coating material and the heated air in the mixing part 400, it is possible to completely remove the moisture present in the entire coating material.

The injection nozzle 420 is formed so that the coating material can be sprayed only on the portion of the object 1 to be coated with the coating material. That is, when covering only the head portion 1a of the fastening object 1, the injection nozzle 420 is formed to have a pointed shape corresponding to the shape of the head portion 1a. In addition, when covering only the trunk portion 1a of the fastening object 1, the injection nozzle 420 is formed to have a shape corresponding to the shape of the trunk portion 1b.

17 (a) is a graph showing a change in surface temperature of an object to be fastened when a coating material is sprayed without mounting an air heating part in a coating material spraying apparatus according to the second aspect of the present invention, and FIG. 17 (b) 2 is a graph showing changes in surface temperature of an object to be fastened when an air heating unit is mounted and a coating material is sprayed in a coating material spraying apparatus according to a second aspect of the present invention.

Generally, in a coating apparatus for coating a coating material on a fastening object such as a screw, the coating material is first heated to a temperature suitable for welding the coating material to the fastening object, such as about 170 ° C to 180 ° C (C section in (b)), the coating material is coated. At the time of spraying the coating material on the object to be fastened, the air is simultaneously sprayed so that the coating material does not flow into a portion where coating is not required. Accordingly, the coating material and the air at room temperature are simultaneously sprayed on the object to be fastened heated by the heating unit, so that the temperature of the object to be fastened is rapidly lowered (section B in FIG. 17A) The coating material is not uniformly coated on the object to be fastened because it contains moisture because the coating material is continuously exposed to moisture.

However, when the air heater 320 is mounted and the coating material is sprayed as in the coating material spraying apparatus according to the second aspect of the present invention (FIG. 16), the coating material and the heated air are mixed in the mixing unit 400 The moisture present in the entire coating material can be completely removed. Also, in FIG. 17 (b), the temperature of the object to be fastened heated by the heating part is not sharply lowered due to the injection of the heated air as in the section D. Thus, there is an effect that the coating material can be uniformly coated on the object to be fastened.

A preferred embodiment of the coating material supply apparatus according to the third aspect of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 18 is a view showing a coating material supply apparatus according to a third aspect of the present invention, and FIG. 19 is a view showing a use state of the coating material dispersion unit in the coating material supply apparatus according to the third aspect of the present invention.

The coating material supplying apparatus according to the third aspect of the present invention includes a receiving space 512 for accommodating a coating material therein as shown in Fig. 18, a coating material A case 510 including a material transfer passage 514 and a discharge port 516 provided so that the coating material moved along the coating material transfer passage 514 can be discharged to the outside; A coating material dispersing unit 520 (at least one of the discharge port 516 and the coating material moving path 514) for dispersing the coagulated coating material moving along the coating material moving path 514 into fine particles ).

The case 510 is formed in a hemispherical shape or a circular truncated cone shape so that an upper portion thereof is opened and a receiving space 512 is formed to accommodate a coating material therein. Since the coating material is continuously exposed to the external moisture, such moisture causes the coating material to flocculate. Accordingly, the inner surface of the accommodation space 512 is provided as a heat transfer surface, and current is supplied to the heat transfer surface to generate heat, thereby removing the moisture of the coating material accommodated in the accommodation space 512 . In addition, the coating material moving passage 514 has a constant width and is spirally arranged from the lower side to the upper side along the inner rim of the case 510. When the forward and reverse rotational vibrations are applied to the case 510 on the horizontal plane, the coating material accommodated in the accommodating space 512 of the case 510 flows through the coating material moving path 514 Movement. At this time, the bottom surface of the accommodation space 512 is coated with a material having a high coefficient of friction with respect to a direction opposite to the moving direction of the coating material, thereby preventing the coating material from tilting to one place according to the vibration of the case 510, So as to be moved forward. Further, a discharge port 516 is formed at the end of the coating material moving passage 514 so as to discharge the coating material by a spraying device or the like for spraying the coating material onto the coating fastening object.

The coating material dispersing unit 520 includes a first dispersing unit 522 provided on the upper portion of the coating material conveying passage 514 and forming a slit allowing only a predetermined height of coating material to pass therethrough, Has a height adjusting portion 523 for adjusting the thickness of the slit. That is, the first dispersing unit 522 is located above the coating material moving passage 514, and one end 522a is coupled to the case 510 so as to be movable up and down, and the other end 522b and the coating material moving passage 514, So that the coagulated coating material is primarily dispersed while passing between the other end 522b and the slit of the coating material moving passage 514. [ One end 522a of the first dispersing unit 522 corresponding to the horizontal part of the letter 'A' is vertically movable on the upper side of the inner surface of the case 510, and the ' The other end 522b of the first dispersing unit 522 is spaced apart from the coating material moving passage 514 by a vertical movement of one end 522a of the first dispersing unit 522. [ A height adjusting part 523 for adjusting the vertical movement is installed at one end 522a of the first dispersing unit 522. Since the vertical adjusting device including the height adjusting part 523 is well known and commonly used, A detailed description of the technical configuration of the present invention will be omitted. On the other hand, since the coating material is continuously exposed to external moisture, the coating material is not uniformly coated on the object for coating fastening because the coating material contains moisture because the coating material is continuously exposed. As a result, the coagulated coating material moves along the coating material moving path 514 and is primarily dispersed while passing the gap between the other end 522b of the first dispersing unit 522 and the coating material moving path 514 do.

The coating material dispersing unit 520 includes a second dispersing unit. The second dispersing unit includes a body portion 524 positioned at a predetermined height from the upper surface of the discharge port 516 and the coating material moving path 514, And extends from the lower surface of the main body portion 524 and is spaced apart from the upper surface of the discharge port 516 and the coating material moving path 514 by a predetermined distance and has the discharge port 516 and the coating material moving path 514 in the lateral direction And a pivotal portion which is disposed at a predetermined distance from the lower surface of the main body portion 524 so as to cross the main body portion 524 and vibrates together with the main body portion.

The pivotal portion includes a plurality of fins 526 spaced a predetermined distance from the lower surface of the main body portion 524 so as to transverse the discharge port 516 and the coating material movement path 514 .

The plurality of fins 526 may be formed by first dispersing the coagulated coating material E through the first dispersing unit 522 as shown in FIG. 19, and then (F) secondarily dispersing the coating material As the forward rotation direction and the reverse rotation vibration on the horizontal plane applied to the case 510 for transferring the coating material are transmitted to the main body portion 524, the plurality of fins 526 oscillate, (G).

Further, as a further embodiment, preferably, the main body portion 524 may be provided with a vibration generating portion (not shown) applying horizontal high-frequency vibration to the main body portion.

When coating the finely dispersed coating material on the coating-fastening object using the coating material spraying apparatus, a uniform coating quality can be expected.

As a further embodiment of the pivoted portion, a fine mesh may be provided in front of the discharge port instead of the plurality of pins, or other dispersion means may be employed.

Hereinafter, an insulating coating method of a fastening object for coating a coating material, which is an insulating material, with an object to be fastened using the coating apparatus according to the present invention, and an operation mechanism of the coating apparatus will be described.

FIG. 20 is a schematic process flow diagram of a method for insulative coating of a fastening object according to the present invention. FIG.

20, an insulating coating method of a fastening object according to the present invention includes a supplying step S10, a holding step S20, an aligning step S30, a first coating step S40, Step S50, removing step S60, and cleaning step S70.

First, the rotary table 10 is driven to rotate. As a result, a plurality of gripping units 20 provided in the circumferential direction of the rotary table 10 and the object to be fastened held by the gripping unit 20 rotate along the rotating direction of the rotary table 10, The fastening object is rotated on a horizontal plane so as to sequentially pass the aligning step (S30), the first coating step (S40), and the second coating step (S50) after the gripping step (S20) .

Then, the supply object 50 is used to supply the object to be fastened, which is stored in the supply unit 50, to the gripping unit 20.

Thereafter, the upper surface of the head portion of the fastening object is gripped by the gripping surface of the gripping unit 20 by using the gripping unit 20. At this time, the grip unit 20 uses a magnetic force or a vacuum suction unit to detachably hold the upper surface of the head.

Thereafter, the aligning unit 60 is used to align the object with respect to the holding surface of the holding unit 20. Specifically, the object is aligned such that the center of the head of the object on the gripping surface is located at the center of the gripping surface of the gripping portion. This process is carried out in such a manner that the object to be fastened, which is rotated due to the rotation of the rotary table 10, is rotated by the rotating unit and the rotating guide unit in the section of the aligning unit 60, Concentrically aligned.

Thereafter, the head of the fastening object is heated to a predetermined first temperature by using the first coating unit 70, and the head portion is coated with the coating material.

Specifically, the first coating step S40 includes a first rotation step, a first heating step, a first air injection step, a first injection step, and a first recovery step.

First, when the object to be fastened enters the first heating part by rotation of the rotary table 10, the head of the object is heated to a predetermined first temperature by using the first heating part.

Thereafter, the first spray portion 74 is used to spray the coating material onto at least a part of the side surface of the head portion of the object heated in the first heating step and the lower surface thereof.

Preferably, before the first injection step, the air heating unit may be used to heat the air to a pre-set preheat temperature, and then supply the heated air to the mixing unit. Here, the coating material and the heated air may be mixed in the mixing part and supplied to the first injection nozzle.

Air is jetted to form an air curtain on the side surface of the head portion passing through the lower portion of the first jetting portion (74) by using the first air jetting means. Preferably, the first air injection step may be performed during the execution time of the first injection step from before the first injection step, or may be preliminarily set from the end of the first injection step before the first injection step Time. ≪ / RTI >

Preferably, before the first air injection step, the air heating unit may be used to heat the air up to a pre-set preheat temperature, and then the heated air may be injected onto the side of the head unit.

Of course, the first air injection step may be executed simultaneously with the first injection step.

Wherein the first injection step is performed at the same time as the first injection step or before a predetermined time from the start time of the first injection step until a predetermined time after the end of the first injection step, The residual coating material that has not been deposited on the head of the object after the jetting from the first jetting unit 74 is recovered.

Preferably, during the first collecting step, the vacuum suction unit of the first collecting unit is driven to generate a vacuum suction force around the first collecting unit.

Preferably, for uniform heating and uniform coating, during the first coating step (S40), the gripping unit (20) and the fastening object gripped by the gripping unit (20) using the rotating guide unit Rotate.

A second coating step S50 is performed using the second coating unit 80 after completing the first coating step S40 and the second coating step S50 is performed in a second rotation step, , A second air injection step, a second injection step, and a second recovery step.

First, when the object to be fastened enters the second heating part by rotation of the rotary table 10, the body part of the object is heated to a predetermined second temperature by using the second heating part. Here, the predetermined second temperature is set to be lower than the predetermined first temperature.

Thereafter, the coating material is sprayed onto the side surface of the body portion of the object heated in the second heating step by using the second jetting section (84).

Preferably, before the second injection step, the air heating unit may be used to heat the air up to a predetermined preheating temperature, and then supply the heated air to the mixing unit. Here, the coating material and the heated air may be mixed in the mixing part and supplied to the second injection nozzle.

Here, air is jetted to form an air curtain at one end of the body portion (or a connecting portion between the body portion and the head portion) passing through the lower portion of the second jetting portion 84 by using the second air jetting means do. Preferably, the second air injection step may be performed during the execution time of the second injection step from before the second injection step, or may be preformed from the end of the second injection step before the second injection step Time. ≪ / RTI >

Of course, the second air injection step may be executed simultaneously with the second injection step.

Preferably, before the second air injection step, the air is heated to a predetermined preheating temperature by using the air heating unit, and then the heated air is injected to one end of the body.

In the second injection step using the second recovery unit from a time before the preset time from the start time of the second injection step to a time after the end of the first injection step, And the remaining coating material that has not been deposited on the head of the object after being ejected from the second jetting section 84 is recovered.

At this time, it is preferable that the vacuum suction unit of the second recovery unit is driven during the second recovery process to generate a vacuum suction force around the second recovery unit.

Preferably, for uniform heating and uniform coating, during the second coating step (S50), the gripping unit (20) and the fastening object gripped by the gripping unit (20) using the rotating guide unit Rotate.

After the completion of the second coating step (S50), the object to be fastened and rotated by the rotary table (10) is detached from the gripping unit (20) by using the detaching unit (90). The detachment object to be fastened is dropped and stored in a storage portion located under the detaching unit (90).

Thereafter, the gripping surface of the gripping unit 20 is cleaned using the cleaning unit 100.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Will be apparent to those of ordinary skill in the art.

S 10: supply step S 20: gripping step
S 30: alignment step S 40: first coating step
S 50: Second coating step S 60: Removal step
S 70: washing step 10: rotating table
20: gripping unit 30: belt-shaped rotating guide unit
40: fixed type rotating guide unit 50: supply unit
60: alignment unit 70: first coating unit
80: second coating unit 90: detaching unit
100: cleaning unit

Claims (20)

As an insulating coating method using a coating apparatus,
A supply step of supplying a fastening object having a body part and a head part provided at one end of the body part;
A gripping step of gripping an object to be fastened supplied in the supplying step;
A first coating step of heating the head part of the fastening object to a predetermined first temperature and coating the head part with a coating material;
And a second coating step of heating the body portion of the object to be fastened to a predetermined second temperature and covering the body portion with a coating material.
The method according to claim 1,
Wherein the first coating step comprises:
A first heating step of heating the head of the fastening object;
And a first spraying step of spraying a coating material onto at least a part of a side surface of a head part of the fastening object heated in the first heating step and a lower surface thereof.
The method of claim 2,
The gripping step of the gripping unit included in the coating apparatus is carried out so as to grasp the upper surface of the head of the fastening object,
Wherein the first coating step comprises:
And a first rotating step of rotating the fastening object gripped by the gripping part and the gripping part during the first coating step.
The method of claim 2,
Wherein the first coating step comprises:
And a first air spraying step of spraying air to form an air curtain on a side surface of the head part.
The method of claim 4,
Wherein the first air injection step is performed for a predetermined time from the end of the first injection step to the execution time of the first injection step from before the first injection step or from the end of the first injection step , Or at the same time as the first spraying step.
The method of claim 2,
Wherein the first coating step comprises:
Further comprising a first collecting step of collecting residual coating material that has not been deposited on the head of the fastening object after being sprayed in the first spraying step.
The method according to claim 1,
Wherein the second coating step comprises:
A second heating step of heating the body of the fastening object;
And a second spraying step of spraying a coating material onto the body part heated in the second heating step.
The method of claim 7,
The gripping step of the gripping unit included in the coating apparatus is carried out so as to grasp the upper surface of the head of the fastening object,
Wherein the second coating step comprises:
And a second rotating step of rotating the gripping object gripped by the gripping part and the gripping part during the second coating step.
The method of claim 7,
Wherein the second coating step comprises:
And a second air spraying step of spraying air to form an air curtain on a side surface of one end of the body part.
The method of claim 9,
Wherein the second air injection step is executed for a predetermined time from the end of the second injection step to the execution time of the second injection step from before the second injection step or before the second injection step , Or the second spraying step.
The method of claim 7,
Wherein the second coating step comprises:
And a second recovery step of recovering the remaining coating material that has not been deposited on the body of the fastening object after being sprayed in the second spraying step.
The method according to claim 1,
Wherein the predetermined first temperature is higher than the predetermined second temperature.
The method according to claim 1,
And a rotation transfer step of rotating and transferring the fastening object on a horizontal plane so that the fastening object sequentially passes through the first coating step and the second coating step after the holding step, Way.
The method according to claim 1,
The gripping step of the gripping unit included in the coating apparatus is carried out so as to grasp the upper surface of the head of the fastening object,
In the insulating coating method,
Between the holding step and the first coating step,
And aligning the fastening object so that the center of the head of the fastening object is positioned at the center of the gripping surface of the gripping part in the gripping step.
The method according to claim 1,
After the second coating step,
And removing the object to be fastened held in the holding step.
16. The method of claim 15,
After the removing step,
And a cleaning step of cleaning the holding surface on which the object to be fastened is held in the holding step.
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