JP2009095795A - Cartridge type coating apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To dispense with the cleaning work of a rotary shaft of an air motor by preventing a coating material dropped from a feed tube from depositing on the rotary shaft. <P>SOLUTION: A cylindrical body 26 covering from the front end part to axial midway part of an inner circumferential surface 8A of the rotary shaft 8 of the air motor 6 is attached to the inside of the rotary shaft 8 detachably. The deposition of the coating material on the inner circumferential surface 8A is prevented because the inner circumferential surface 8A of the rotary shaft 8 is covered with a drum part 26A of the cylindrical body 26 when the cylindrical body 26 is attached to the inside of the rotary shaft 8. When the cylindrical body 26 is soiled by the coating material, the soiled cylindrical body 26 is detached from the rotary shaft 8 and in place thereof, a fresh cylindrical body 26 is attached to the inside of the rotary shaft 8. As a result, replacement of the cylindrical body 26 on which the coating material has been deposited with the fresh one makes the cleaning work of the rotary shaft 8 unnecessary. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a cartridge-type coating apparatus for coating an object to be coated while changing colors by changing cartridges for each color, for example.

  2. Description of the Related Art Generally, a painting apparatus that coats an object to be coated such as an automobile body includes, for example, a housing that is attached to the tip of an arm of a painting robot, and a hollow rotation that is provided on the front side of the housing and extends in the axial direction toward the front. An air motor whose shaft is rotated by an air turbine, a rotary atomizing head attached to a front end portion of the rotating shaft of the air motor, and a feed tube which extends forward in the rotating shaft of the air motor and discharges paint to the rotary atomizing head It is comprised by.

  This coating apparatus rotates the rotating shaft of an air motor at high speed in order to atomize the paint sprayed from the rotary atomizing head. At this time, air particles in the rotating shaft move to the outside in the radial direction by centrifugal force, and accordingly, the rotating shaft has a negative pressure. Therefore, during the painting operation, some of the sprayed paint particles are pulled to the negative pressure side and enter the rotating shaft, so that there is a problem that the paint adheres to the inner peripheral surface of the rotating shaft.

  Therefore, in the conventional coating apparatus, a part of the air supplied to the air turbine, a part of the air supplied to the air bearing supporting the rotary shaft, or a dedicated air so that the paint particles do not enter the rotary shaft. There is a configuration in which the inside of the rotating shaft is set to a positive pressure by guiding it into the rotating shaft (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 9-168753

  On the other hand, in recent coating apparatuses, there is a cartridge type coating apparatus that performs coating by replacing the cartridge for each color and mounting it on a housing and supplying the coating material from this cartridge to the rotary atomizing head (for example, Patent Document 2). reference).

JP 11-262699 A

  In the cartridge type coating apparatus according to Patent Document 2, the rear side of the housing is a bottomed cylindrical cartridge mounting portion. Then, the cartridge tank portion is inserted into the cartridge mounting portion, and the feed tube is inserted into the rotating shaft of the air motor, so that the cartridge is attached to the housing in a replaceable manner.

  By the way, in the above-described cartridge-type coating apparatus according to Patent Document 2, as in the coating apparatus of Patent Document 1, the coating air enters the rotating shaft by introducing the compressed air into the rotating shaft to make a positive pressure. Can be prevented.

  However, the cartridge type coating apparatus is configured to attach and remove the cartridge to and from the housing. For this reason, for example, the paint remaining at the tip of the feed tube may drop during attachment / detachment work and adhere to the inner peripheral surface of the rotating shaft.

  In this way, since the coating material adhering to the inner peripheral surface of the rotating shaft is repeatedly stacked and accumulated, the coating material deposited during coating is peeled off and adhered to the object to be coated. In this case, it becomes a factor that impairs the coating quality. It is also conceivable that the performance of the air motor deteriorates as the coating deposition progresses.

  Therefore, in the cartridge type coating device, the paint adhering to the inner peripheral surface of the rotating shaft is periodically removed and washed. However, since the paint is solidified over time, it is often used for cleaning work. There is a problem that it takes a long time.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to prevent the paint from adhering to the rotating shaft of the air motor and to eliminate the cleaning operation of the rotating shaft. To provide an apparatus.

  A cartridge type coating apparatus according to the present invention has a housing having a motor mounting portion on the front side and a cartridge mounting portion on the rear side, and a hollow rotating shaft attached to the motor mounting portion of the housing and extending in the axial direction toward the front. An air motor, a rotary atomizing head which is attached to a front end portion of a rotary shaft of the air motor and sprays the paint supplied while rotating by the air motor, a tank portion for storing the paint, and extends forward from the tank portion And a cartridge that is inserted into the rotary shaft of the air motor and discharges the paint toward the rotary atomizing head when the feed tube is attached to the cartridge attachment portion of the housing. .

  In order to solve the above-described problem, the feature of the configuration adopted by the invention of claim 1 is that in the rotation shaft of the air motor, there is an intermediate portion in the axial direction from at least the front end portion of the inner peripheral surface of the rotation shaft. A cylinder covering up to the position is attached and provided so as to be removable, and the cylinder prevents the paint from adhering to the inner peripheral surface of the rotating shaft.

  According to a second aspect of the present invention, the cylindrical body is provided with a stopper for positioning in the insertion direction when inserted into the rotating shaft.

  According to a third aspect of the present invention, the cylindrical body is provided with a backflow prevention portion for preventing the adhered paint from flowing backward from the front end portion in the reverse direction.

  According to a fourth aspect of the present invention, the cylindrical body is inserted in a state of rotating integrally with the rotary shaft of the air motor and detachable from the front end side of the rotary shaft.

  According to a fifth aspect of the present invention, the cylindrical body is inserted in a non-rotating state with respect to the rotary shaft of the air motor and detachably inserted from the rear end side of the rotary shaft toward the front end portion.

  According to the first aspect of the present invention, the cylindrical body that covers at least the front end portion to the midway position in the axial direction of the inner peripheral surface of the rotary shaft of the air motor is provided so as to be removable. Thereby, in the state which provided the cylinder in the rotating shaft, adhesion of the coating material to the internal peripheral surface of a rotating shaft can be prevented with this cylinder. If the cylinder is contaminated with paint, the dirty cylinder can be removed from the rotating shaft, and a new cylinder can be installed in the rotating shaft instead.

  As a result, when the cartridge is attached to and detached from the cartridge attachment portion of the housing, even when the paint drops from the tip of the feed tube, the cylinder can prevent the paint from adhering to the rotating shaft of the air motor. . In addition, by replacing the cylinder to which the coating material is attached with a new cylinder, the cleaning operation of the rotating shaft can be omitted, and workability can be improved.

  According to the invention of claim 2, the stopper can be positioned in the insertion direction when the cylindrical body is inserted into the rotating shaft. Thereby, a cylinder can be attached to a rotating shaft easily and correctly, and the exchange operation of a cylinder can be made easy.

  According to the third aspect of the present invention, the inner peripheral surface of the cylindrical body is provided with the backflow preventing portion that prevents the adhered paint from flowing backward from the front end portion, so that the paint spills from the cylindrical body. Adhering to the rotating shaft can be prevented, and the rotating shaft can be kept even cleaner.

  According to the invention of claim 4, since the cylinder can be inserted from the front end side of the rotary shaft of the air motor so as to be detachable, the cylinder can be attached to the rotary shaft only by removing the rotary atomizing head from the rotary shaft. Can be easily installed and removed. Further, the cylindrical body can rotate integrally with the rotating shaft, and can rotate the rotating shaft at high speed without impairing the rotation balance.

  According to the invention of claim 5, since the cylinder can be inserted from the rear end side of the rotary shaft of the air motor to the front end portion in a detachable manner, the rotary atomizing head is removed from the rotary shaft, and the air motor is removed from the housing. By removing, the cylindrical body can be easily attached to and detached from the rotating shaft. Further, since the cylindrical body is in a non-rotating state with respect to the rotating shaft, the dimensional accuracy, the weight balance and the like can be set low, and can be manufactured at low cost.

  Hereinafter, a cartridge type coating apparatus according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  First, FIG. 1 to FIG. 4 show a first embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a cartridge type coating apparatus (hereinafter referred to as a coating apparatus 1) according to the first embodiment. The painting apparatus 1 is attached to the tip of an arm (not shown) of a painting robot, for example. And the coating device 1 is roughly comprised by the below-mentioned housing 2, the air motor 6, the rotary atomizing head 11, the shaping air ring 12, the cartridge 17, etc.

  A housing 2 is attached to the tip of the arm of the painting robot. The housing 2 is configured in a T shape in which a head portion 2B is integrally formed at a substantially right angle to the tip of the neck portion 2A, for example. The head portion 2B of the housing 2 is provided with a motor mounting portion 3, a cartridge mounting portion 4 and a feed tube insertion hole 5 which will be described later.

  Reference numeral 3 denotes a motor mounting portion provided on the front side of the head portion 2B of the housing 2, and the motor mounting portion 3 is formed in a bottomed cylindrical shape. In addition, a female screw 3A for screwing and attaching a shaping air ring 12 to be described later is engraved in the opening of the motor attachment portion 3.

  Reference numeral 4 denotes a cartridge mounting portion provided on the rear side of the head portion 2B of the housing 2, and the cartridge mounting portion 4 is formed in a bottomed cylindrical shape. Further, a fitting hole 4A and the like for fitting a quick joint 24 of the cartridge 17 described later are formed on the bottom of the cartridge mounting portion 4.

  Reference numeral 5 denotes a housing-side feed tube insertion hole provided in the head portion 2 </ b> B of the housing 2. The feed tube insertion hole 5 extends forward and rearward in the axial center of the head portion 2B, and the front side opens at the bottom of the motor mounting portion 3 and the rear side opens at the bottom of the cartridge mounting portion 4. The feed tube insertion hole 5 allows the feed tube 22 of the cartridge 17 to be inserted therethrough.

  Reference numeral 6 denotes an air motor attached to the motor attachment portion 3 of the housing 2, and this air motor 6 rotationally drives a rotary atomizing head 11 described later at a high speed. The air motor 6 is roughly constituted by a motor case 7, a rotating shaft 8, an air bearing 9, and an air turbine 10 which will be described later.

  Reference numeral 7 denotes a motor case forming the outer shape of the air motor 6, and the motor case 7 is formed in a cylindrical shape to be inserted into the motor mounting portion 3. In addition, a feed tube insertion hole 7 </ b> A on the motor side that is connected to the rotating shaft 8 is formed in the rear end portion of the motor case 7. Further, a high voltage generator 13 described later is electrically connected to the motor case 7.

  Reference numeral 8 denotes a rotating shaft that is rotatably provided at the shaft center of the motor case 7. The rotating shaft 8 is formed as a cylindrical hollow shaft, and its inner peripheral surface 8A is coaxially connected to the feed tube insertion holes 5 and 7A. On the other hand, the front end side of the rotating shaft 8 protrudes from the motor case 7, and a male screw 8B is engraved on the protruding outer periphery. Further, the front end surface 8C of the rotating shaft 8 is a contact with a stopper 26C of a cylindrical body 26 described later, and is an annular flat surface.

  Reference numeral 9 denotes an air bearing which is provided in the motor case 7 and rotatably supports the rotary shaft 8. Reference numeral 10 denotes an air turbine which is provided on the rear end side of the rotary shaft 8 and rotationally drives the rotary shaft 8 with compressed air.

  Here, the air motor 6 is configured such that the motor case 7 is inserted into the motor mounting portion 3 and a shaping air ring 12 (described later) is screwed onto the female screw 3A provided on the opening side of the motor mounting portion 3 in this state. It is fixed to the motor mounting portion 3.

  Reference numeral 11 denotes a rotary atomizing head attached to the front end portion of the rotary shaft 8 of the air motor 6. The rotary atomizing head 11 is sprayed as countless paint particles atomized by centrifugal force by being supplied with a paint from a feed tube 22 of a cartridge 17 which will be described later while being rotated at high speed by the air motor 6. Is. Further, as shown in FIGS. 2 and 4, the rotary atomizing head 11 is formed in a bell shape or a cup shape that expands forward from a cylindrical mounting portion 11A located on the rear side, and the mounting portion 11A. A female screw 11B that is screwed into the male screw 8B of the rotary shaft 8 is engraved on the inner peripheral side.

  A shaping air ring 12 is located on the front end side of the air motor 6 and is attached to the motor attachment portion 3 of the housing 2. The shaping air ring 12 is formed in a stepped cylindrical shape, and at its front end, a number of shaping air ejection holes 12A (only two are shown) for patterning paint particles discharged from the rotary atomizing head 11 are shown. Is open forward. Further, on the rear side of the shaping air ring 12, a male screw 12B that is screwed onto the female screw 3A of the motor mounting portion 3 is provided.

  The shaping air ring 12 can fix the air motor 6 in the motor mounting portion 3 by screwing the male screw 12B to the female screw 3A of the motor mounting portion 3. On the other hand, when the shaping air ring 12 is removed from the motor attachment portion 3, the air motor 6 can be removed from the motor attachment portion 3.

  Reference numeral 13 denotes a high voltage generator provided at the neck portion 2A of the housing 2. The high voltage generator 13 is constituted by, for example, a cockcroft circuit, and supplies a voltage supplied from a power supply device (not shown) from -60 to-. The voltage is boosted to 120 kV. The output side of the high voltage generator 13 is electrically connected to the air motor 6, for example, so that the high voltage generator 13 applies a high voltage to the rotary atomizing head 11 via the rotating shaft 8 of the air motor 6. The paint supplied to the rotary atomizing head 11 is directly charged.

  Reference numeral 14 denotes a plurality of air passages provided in the neck portion 2A of the housing 2 and connected to a control air source (not shown). These air passages 14 supply turbine air for controlling the air motor 6, bearing air, brake air, shaping air for forming a spray pattern of paint, pilot liquid valve 16, pilot air for the paint valve 25, and the like. Is. However, in the present embodiment, only three air passages 14 are typically shown.

  Reference numeral 15 denotes a housing-side extruded liquid passage provided in the housing 2. One end of the extruded liquid passage 15 is connected to an extruded liquid supply device (not shown), and the other end opens at the bottom of the fitting hole 4A of the cartridge mounting portion 4 formed in the head portion 2B.

  Reference numeral 16 denotes an extruded liquid valve provided in the head portion 2 </ b> B of the housing 2. The extrusion liquid valve 16 normally blocks the extrusion liquid passage 15 and stops the supply of the extrusion liquid to the extrusion liquid storage chamber 21 of the cartridge 17 described later. On the other hand, when pilot air is supplied, the valve is opened to supply the extrusion liquid to the extrusion liquid storage chamber 21.

  Next, the cartridge 17 that is detachably attached to the housing 2 will be described.

  Reference numeral 17 denotes a cartridge that is detachably attached to the cartridge attachment portion 4 of the housing 2 (see FIG. 1). A plurality of cartridges 17 are prepared, and are replaced and attached to the housing 2 for each painting operation. The cartridge 17 is roughly constituted by a tank portion 18, a piston 19, a feed tube 22 and the like which will be described later.

  Reference numeral 18 denotes a tank portion of the cartridge 17, and the tank portion 18 is formed as a cylindrical container closed at both ends in the axial direction. Further, a piston 19 forming a movable partition wall is inserted into the tank portion 18 so as to be displaceable in the axial direction. The piston 19 defines the inside of the tank portion 18 as a front paint storage chamber 20 and a rear extruded liquid storage chamber 21.

  In addition, a gripping protrusion 18A that is gripped when performing replacement work is provided at the rear end of the tank portion 18. On the other hand, on the front side of the tank portion 18, a paint passage 18 </ b> B is provided that connects a paint supply path 22 </ b> A of a feed tube 22 described later to the paint storage chamber 20. Further, a joint attachment hole 18C for attaching the quick joint 24 is provided at the front end portion of the tank portion 18.

  A feed tube 22 extends forward from the tank portion 18. The distal end side of the feed tube 22 extends through the feed tube insertion holes 5, 7 </ b> A of the housing 2 and the rotation shaft 8 of the air motor 6, and the distal end portion opens toward the rotary atomizing head 11. Further, in the feed tube 22, a paint supply path 22 </ b> A that communicates with the paint storage chamber 20 of the tank portion 18 via the paint path 18 </ b> B is formed. Further, a valve seat 22B is provided on the distal end side of the feed tube 22 by reducing the diameter of the paint supply path 22A.

  Reference numeral 23 denotes a cartridge-side extruded liquid passage provided in the tank portion 18 so as to communicate with the extruded liquid storage chamber 21. The extruded liquid passage 23 communicates with the housing-side extruded liquid passage 15 when the cartridge 17 is fitted to the cartridge mounting portion 4 of the housing 2. Further, the extrusion liquid passage 23 can communicate with a filling table side extrusion liquid passage (none of which is shown) provided in the filling table of the coating material supply mechanism.

  Reference numeral 24 denotes a quick joint with a check valve provided in the joint mounting hole 18 </ b> C of the tank portion 18 at the opening end of the cartridge side extruded liquid passage 23. The quick coupling 24 opens when the cartridge 17 is attached to the housing 2 of the coating apparatus 1 or the filling base of the paint supply mechanism. On the other hand, when the housing 2 is removed from the filling table, the valve is closed to prevent the extruded liquid from flowing out from the cartridge-side extruded liquid passage 23.

  Reference numeral 25 denotes a paint valve provided at a front portion of the tank portion 18. The paint valve 25 performs on / off control of the paint supplied from the feed tube 22 toward the rotary atomizing head 11. The paint valve 25 includes an axially displaceable piston 25A, and a valve body 25B extending from the piston 25A into the paint supply path 22A of the feed tube 22 and having a tip attached to and detached from the valve seat portion 22B. It is configured.

  Next, the cylinder 26 for preventing the coating material from adhering to the inner peripheral surface 8A of the rotary shaft 8 of the air motor 6 will be described.

  In FIG. 2, reference numeral 26 denotes a cylinder provided in the rotary shaft 8 of the air motor 6. This cylindrical body 26 prevents the paint dripped from the feed tube 22 from adhering to the middle position in the axial direction from the front end portion of the inner peripheral surface 8A of the rotating shaft 8. Further, the cylindrical body 26 is inserted and fitted from the front end side to the inner peripheral surface 8A of the rotating shaft 8 of the air motor 6 and is pulled out and removed.

  As shown in FIG. 3, the cylindrical body 26 includes a cylindrical body portion 26A, an inner flange-shaped backflow prevention portion 26B provided with a reduced diameter at the back portion (rear portion) of the body portion 26A, An outer flange-shaped (flange-shaped) stopper 26C provided at the opening (front) of the trunk portion 26A and an inner flange-shaped partition wall portion 26D provided at the opening of the trunk portion 26A. .

  Further, the cylindrical body 26 is formed of, for example, a resin material having an elastic force, so that when it is pushed into the rotating shaft 8, it is fitted (tightly fitted) to the inner peripheral surface 8A with an elastic force without any gap. , Can be fixed in place. The cylindrical body 26 is inserted into the rotary shaft 8 of the air motor 6 that rotates at a high speed, and rotates at a high speed together with the rotary shaft 8. However, since the cylindrical body 26 is made of a lightweight resin material or the like that is in close contact with the rotary shaft 8 by an elastic force, there is no rotational unbalance that would hinder high-speed rotation of the rotary shaft 8. Moreover, the cylindrical body 26 can be manufactured at low cost by a molding process using a resin material.

  Here, since the cylindrical body 26 rotates together with the rotary shaft 8, the diameter of the barrel portion 26 </ b> A is set so as to fit into the rotary shaft 8 without a gap. Are formed with the same or slightly smaller dimensions. Further, when the cartridge 17 is detached from the cartridge mounting portion 4 of the housing 2, the gripping projection 18A of the tank portion 18 is gripped and pulled out, so that an impact is generated at this time. Further, when the cartridge 17 is attached to the cartridge attachment portion 4 of the housing 2, the front edge portion of the tank portion 18 may collide with the cartridge attachment portion 4. Therefore, the length dimension of the body portion 26A is set to a dimension that can cover the range in which the coating material drops (scatters) from the tip of the feed tube 22 due to these causes.

  Further, the backflow prevention portion 26B of the cylindrical body 26 is formed in an inner collar shape with a reduced diameter at the inner portion of the body portion 26A, so that the paint adhering to the body portion 26A is brought to the air turbine 10 side by negative pressure due to high speed rotation. This prevents backflow.

  Further, since the stopper 26C of the cylindrical body 26 is formed in an outer flange shape (flange shape) in which the opening of the body portion 26A is enlarged, when the body portion 26A is inserted into the rotary shaft 8 from the front end side. The cylindrical body 26 can be positioned in the insertion direction with respect to the rotary shaft 8. That is, the cylindrical body 26 can be attached to an accurate axial position simply by pushing the stopper 26C into the rotary shaft 8 until it comes into contact with the front end face 8C of the rotary shaft 8. Moreover, when removing the cylindrical body 26 from the rotary shaft 8, a tool or a fingertip can be hooked on the stopper 26C, and the cylindrical body 26 can be easily pulled out.

  Furthermore, since the partition wall portion 26D of the cylindrical body 26 is formed in an inner flange shape in which the opening portion of the body portion 26A is reduced in diameter, the opening on the front side of the body portion 26A (the rotating shaft 8) can be closed. It is possible to prevent floating paint particles from entering the cylindrical body 26.

  The coating apparatus 1 according to the first embodiment has the above-described configuration. Next, an operation for exchanging the cartridge 17 to the housing 2 and an operation for exchanging the cylinder 26 to the rotating shaft 8. explain.

  First, an operation of replacing the cartridge 17 with the housing 2 and mounting it will be described. When the coating of the object is completed, the used cartridge 17 attached to the housing 2 is removed. In this case, the gripping protrusion 18A of the tank portion 18 is gripped, the tank portion 18 is pulled out from the cartridge mounting portion 4 of the housing 2, and the feed tube 22 is pulled out from the rotary shaft 8 of the air motor 6 and the feed tube insertion holes 5, 7A.

  On the other hand, when the used cartridge 17 is removed, the filled cartridge 17 in which the tank portion 18 is filled with the paint is disposed at the attachment position of the housing 2 to the cartridge attachment portion 4. Then, the feed tube 22 is inserted in the order of the feed tube insertion hole 5 of the housing 2 and the rotating shaft 8 of the air motor 6, and the tank portion 18 is inserted into the cartridge mounting portion 4. Thereby, the filled cartridge 17 can be attached to the housing 2. Accordingly, the rotary atomizing head 11 is rotated by the air motor 6, and in this state, the paint is discharged from the feed tube 22 of the cartridge 17 toward the rotary atomizing head 11, thereby discharging the discharged paint from the rotary atomizing head 11. It can be sprayed toward the object.

  Here, in the replacement operation of the cartridge 17 described above, a mechanical impact is generated when the gripping protrusion 18A of the tank portion 18 is gripped and pulled out in order to remove the cartridge 17 from the cartridge mounting portion 4 of the housing 2. Further, when the cartridge 17 is attached to the cartridge attachment portion 4 of the housing 2, the front edge portion of the tank portion 18 may collide with the cartridge attachment portion 4. If paint remains at the tip of the feed tube 22 (paint supply path 22A), the paint drops (scatters) into the rotary shaft 8 due to these causes.

  However, since the cylindrical body 26 is provided in the rotary shaft 8 so as to cover the area where the coating material drops, the coating material dropped from the tip of the feed tube 22 adheres to the cylindrical body 26. When the cartridge 17 is replaced and a predetermined number of painting operations are performed, a large amount of paint is attached to the cylindrical body 26. Therefore, the cylindrical body 26 to which the paint is applied is replaced with a new cylindrical body 26. .

  Therefore, an operation of exchanging and attaching the cylindrical body 26 to the rotating shaft 8 will be described. In this case, the cartridge 17 is removed from the housing 2 and the rotary atomizing head 11 is removed from the rotary shaft 8 of the air motor 6. As a result, the stopper 26C of the cylindrical body 26 is exposed at the tip of the rotary shaft 8, so that the cylindrical body 26 to which the paint adheres can be easily removed from the rotary shaft 8 by pulling the stopper 26C with a tool or a fingertip. Can do.

  Next, when the cylindrical body 26 to which the paint is attached is removed, the backflow prevention portion 26B side of the new cylindrical body 26 is applied to the opening of the rotary shaft 8 and pushed straight. Thereby, the new cylinder 26 can be easily inserted into the rotary shaft 8 without using a special tool or the like. When the new cylindrical body 26 is attached to the rotary shaft 8, the rotary atomizing head 11 is screwed onto the tip of the rotary shaft 8.

  As described above, according to the first embodiment, the cylindrical body 26 that covers from the front end portion of the inner peripheral surface 8 </ b> A of the rotary shaft 8 to the midway position in the axial direction is provided in the rotary shaft 8 of the air motor 6. It was configured to be attachable and removable. Accordingly, when the cylindrical body 26 is attached to the rotary shaft 8, the body portion 26A of the cylindrical body 26 can cover the inner peripheral surface 8A of the rotary shaft 8, and adhesion of paint to the inner peripheral surface 8A is prevented. be able to. If the cylinder 26 is contaminated with paint, the dirty cylinder 26 can be removed from the rotating shaft 8, and a new cylinder 26 can be easily attached to the rotating shaft 8 instead.

  As a result, even when the cartridge 17 is attached to and removed from the cartridge attachment portion 4 of the housing 2, even when the paint drops from the tip of the feed tube 22, the paint is prevented from adhering to the rotating shaft 8 by the cylindrical body 26. can do. Moreover, since the cylinder 26 to which the paint has adhered can be easily replaced with a new cylinder 26, the cleaning operation of the rotating shaft 8 can be omitted, and the workability can be improved.

  Further, since the outer casing-like stopper 26C is provided at the front end portion of the cylindrical body 26, the stopper 26C is brought into contact with the front end face 8C of the rotating shaft 8 when the cylindrical body 26 is inserted into the rotating shaft 8. Thus, the cylindrical body 26 can be positioned at the front side position of the rotary shaft 8. In addition, since the stopper 26C can hook a tool or a fingertip when the cylindrical body 26 is detached from the rotary shaft 8, the cylindrical body 26 can be easily pulled out using the stopper 26C.

  On the other hand, the cylindrical body 26 is provided with an inner collar-like backflow prevention portion 26B in the back portion (rear portion) of the body portion 26A, so that the paint adhering to the inner peripheral surface of the body portion 26A is reversely directed from the front end portion. Backflow can be prevented. Thereby, it can prevent that a coating material spills from the cylinder 26, and adheres to the rotating shaft 8, and can maintain the rotating shaft 8 still more cleanly.

  Further, the cylindrical body 26 can be inserted from the front end side of the rotary shaft 8 of the air motor 6 so as to be removable. Thereby, the cylindrical body 26 can be easily attached to and detached from the rotary shaft 8 simply by removing the rotary atomizing head 11 from the front end portion of the rotary shaft 8, and workability can be improved.

  Furthermore, since the cylindrical body 26 can be manufactured at low cost by a molding process using a resin material, the cylindrical body 26 to which the paint is attached can be disposed of as it is. In addition, the cylindrical body 26 made of a resin material having elastic force can be in close contact with the rotary shaft 8 and can be formed thin and lightweight, so that no rotation imbalance occurs, and the rotary shaft 8 Can rotate at high speed.

  Next, FIGS. 5 to 7 show a second embodiment of the present invention. The feature of this embodiment is that the cylinder is configured to be detachably inserted from the rear end side of the rotary shaft of the air motor. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  In FIG. 5, reference numeral 31 denotes a housing according to the second embodiment, and the housing 31 includes a motor mounting portion 32 on the front side of the head portion 31 </ b> A in substantially the same manner as the housing 2 according to the first embodiment. Further, on the opening side of the motor mounting portion 32 according to the second embodiment, a female screw 32A that is screwed into the male screw 12B of the shaping air ring 12 is engraved. However, the motor mounting portion 32 according to the second embodiment is based on the first embodiment in that an accommodation recess 32B for accommodating a stopper 33B of a cylinder 33 described later is formed at the center of the bottom. It is different from the motor mounting portion 3.

  Next, the cylinder 33 according to the second embodiment provided to prevent the paint from adhering to the inner peripheral surface 8A of the rotary shaft 8 of the air motor 6 will be described.

  Reference numeral 33 denotes a cylinder according to the second embodiment provided in the rotary shaft 8 of the air motor 6. The cylindrical body 33 is provided across the rotary shaft 8 and the feed tube insertion hole 7A of the motor case 7, and prevents the paint dropped from the feed tube 22 from adhering. Further, the cylindrical body 33 is inserted into the feed tube insertion hole 7A of the motor case 7 and the rotary shaft 8 of the air motor 6 from the rear end side toward the front end portion, fitted, and pulled out to be removed. Further, the cylindrical body 33 is loosely inserted into the rotating shaft 8 and is in a non-rotating state. That is, the cylinder 33 is fitted and attached to the feed tube insertion hole 7A of the motor case 7 in a fixed state from the rear side.

  As shown in FIG. 6, the cylindrical body 33 includes a cylindrical barrel portion 33A, an outer flange-shaped (flange-shaped) stopper 33B provided at the rear end portion of the barrel portion 33A, and the barrel portion 33A. It is comprised by the inner flange-shaped partition part 33C provided in the front-end part (opening part). Further, the cylindrical body 33 is formed of a material having a rigidity capable of maintaining a gap with the inner peripheral surface 8A of the rotating shaft 8, for example, a metal material, a resin material, or the like.

  Here, since the cylindrical body 33 is arranged in a state of being fixed in the rotary shaft 8, the body portion 33A is fitted with a gap between the inner peripheral surface 8A of the rotary shaft 8 (free fitting). ), The outer diameter is smaller than the inner diameter of the rotary shaft 8. In this case, since the cylinder 33 needs to be fixed so as not to contact the rotating shaft 8, the body 33 </ b> A is closely fitted in the feed tube insertion hole 7 </ b> A of the motor case 7. In addition, since the body portion 33A is provided over the entire length of the rotating shaft 8, the paint dropped from the feed tube 22 does not adhere to the inner peripheral surface 8A of the rotating shaft 8.

  Further, since the stopper 33B of the cylindrical body 33 is formed in an outer flange shape (flange shape) in which the rear end portion of the barrel portion 33A is enlarged, the barrel portion 33A is rotated by the feed tube insertion hole 7A of the motor case 7 and rotated. When inserted into the shaft 8 from the rear end side, the motor case 7 can be brought into contact with the rear end surface, and the cylindrical body 33 can be positioned in the insertion direction with respect to the rotating shaft 8. Specifically, the stopper 33 </ b> B can be fixed at a position where the front end portion of the cylindrical body 33 is aligned with the front end portion of the rotating shaft 8. Moreover, when the cylinder 33 is removed from the feed tube insertion hole 7A of the motor case 7, a tool or a fingertip can be hooked on the stopper 33B, and the cylinder 33 can be easily pulled out using the stopper 33B.

  Furthermore, since the partition wall 33C of the cylindrical body 33 is formed in an inner flange shape in which the opening of the body 33A is reduced in diameter, the front opening of the body 33A (the rotating shaft 8) can be closed. It is possible to prevent floating paint particles from entering the cylinder 33.

  The coating apparatus 1 according to the second embodiment has the above-described configuration. Next, an operation for exchanging and mounting the cylindrical body 33 in the rotating shaft 8 will be described.

  First, as shown in FIG. 7, the cartridge 17 is removed from the housing 31, and the rotary atomizing head 11 is removed from the rotary shaft 8 of the air motor 6. Further, the shaping air ring 12 is removed from the motor attachment portion 32 of the housing 31, and the air motor 6 is removed from the motor attachment portion 32. As a result, the stopper 33B of the cylindrical body 33 is exposed on the rear end surface of the motor case 7, so that the tool 33 and a fingertip can be put on the stopper 33B and pulled backward to easily remove the cylindrical body 33 to which the paint has adhered from the motor case 7. Can be removed.

  Next, when the cylinder 33 to which the paint is attached is removed, the partition wall 33C side of the new cylinder 33 is applied to the feed tube insertion hole 7A of the motor case 7 and pushed straight. Thereby, the new cylinder 33 can be easily inserted into the rotary shaft 8 without using a special tool or the like. When the new cylinder 33 is mounted in the rotary shaft 8, the air motor 6 is housed in the motor mounting portion 32, and the air motor 6 is fixed by the shaping air ring 12. Further, the rotary atomizing head 11 is screwed onto the tip of the rotary shaft 8.

  Thus, also in the second embodiment configured as described above, it is possible to obtain substantially the same operational effects as those of the first embodiment described above.

  In particular, in the second embodiment, the cylindrical body 33 is configured to be detachably inserted from the rear end side of the rotary shaft 8 of the air motor 6, so that the rotary atomizing head 11 is removed from the rotary shaft 8 and removed from the housing 2. By removing the shaping air ring 12 and the air motor 6, the cylindrical body 33 can be easily attached to and detached from the rotary shaft 8. In addition, since the cylindrical body 33 is provided over the entire length of the rotating shaft 8, it is possible to reliably prevent the paint dripped from the feed tube 22 from adhering to the inner peripheral surface 8 </ b> A of the rotating shaft 8. Furthermore, since the cylinder 33 is fixedly attached to the rotating shaft 8 without rotating at high speed, the dimensional accuracy, weight balance, etc. can be set low, and can be manufactured at low cost. it can.

  In the first embodiment, the case where the inner flange-shaped partition wall portion 26D is provided in the opening portion (front portion) of the body portion 26A constituting the cylindrical body 26 has been described as an example. However, the present invention is not limited to this, and may be configured as a cylindrical body 41 according to the first modification shown in FIGS. 8 and 9, for example. That is, the cylindrical body 41 includes a body portion 41A, a backflow prevention portion 41B, a stopper 41C, and a partition wall portion 41D, and a small-diameter cylindrical portion 41E that projects from the inner periphery of the partition wall portion 41D toward the front side in the axial direction. It is configured. As shown in FIG. 8, the small diameter cylindrical portion 41 </ b> E is formed so as to cover the outer periphery of the distal end with a gap between the outer periphery of the distal end of the feed tube 22. Thereby, the small diameter cylinder part 41E can prevent the coating material discharged from the feed tube 22 from adhering to the outer periphery of the tip end of the feed tube 22, and the cleaning operation of the cartridge 17 can be facilitated.

  Further, in the second embodiment, the case where the inner flange-shaped partition wall portion 33 </ b> C is provided in the opening portion (front portion) of the trunk portion 33 </ b> A constituting the cylindrical body 33 has been described as an example. However, the present invention is not limited to this, and may be configured as a cylindrical body 51 according to the second modification shown in FIGS. 10 and 11, for example. That is, the cylindrical body 51 includes a body portion 51A, a stopper 51B, and a partition wall portion 51C, and a small-diameter cylindrical portion 51D that protrudes from the inner periphery of the partition wall portion 51C toward the front side in the axial direction. As shown in FIG. 10, the small diameter cylindrical portion 51 </ b> D is formed so as to cover the outer periphery of the tip of the feed tube 22 with a gap between the rotary atomizing head 11. As a result, the small-diameter cylindrical portion 51D can prevent the paint discharged from the feed tube 22 from adhering to the outer periphery of the tip of the feed tube 22 in substantially the same manner as the first modification described above, and the cleaning operation of the cartridge 17 can be performed. Can be easily.

  On the other hand, in the first embodiment, the case where the inner collar-like backflow prevention portion 26B is provided only at the rear end portion of the cylindrical body 26 has been described as an example. However, the present invention is not limited to this, and may be configured as a cylindrical body 61 according to the third modification shown in FIG. That is, the cylindrical body 61 is configured by a body portion 61A, a backflow prevention portion 61B, a stopper 61C, and a partition wall portion 61D, and another backflow prevention portion 61E that protrudes radially inward at an intermediate position in the axial direction of the body portion 61A. Are provided in a plurality of stages in the axial direction. In this case, the backflow prevention of the paint can be reliably prevented by the backflow prevention portions 61E.

  Further, in the second embodiment, the case where the cylindrical body 33 is configured by the body portion 33A, the stopper 33B, and the partition wall portion 33C has been described as an example. However, the present invention is not limited to this, and may be configured as a cylindrical body 71 according to a fourth modification shown in FIG. 13, for example. That is, the cylindrical body 71 includes a body portion 71A, a stopper 71B, and a partition wall portion 71C, and is provided with a plurality of backflow prevention portions 71D in the axial direction that project radially inwardly at an intermediate position in the axial direction of the body portion 71A. It is configured. In this case, the backflow of the paint can be prevented by each of the backflow prevention units 71D almost similar to the first embodiment described above.

  Furthermore, in 1st Embodiment, the case where the stopper 26C of the cylinder 26 was formed in the outer casing shape (flange shape) expanded in diameter was illustrated. However, the present invention is not limited to this, and for example, the stopper may be formed by a protrusion or the like protruding outward in the radial direction. That is, the stopper is not limited to these configurations as long as the structure can position the cylinder in the insertion direction. These configurations can be similarly applied to the second embodiment and each modification.

It is a longitudinal section showing a cartridge type painting device by a 1st embodiment of the present invention. It is a longitudinal cross-sectional view which expands and shows the front side part of the cartridge type coating device by 1st Embodiment. It is a longitudinal cross-sectional view which expands and shows the cylinder in FIG. It is a decomposition | disassembly longitudinal cross-sectional view shown in the state which decomposed | disassembled the rotary atomization head in order to remove a cylinder. It is a longitudinal cross-sectional view which shows the front side part of the cartridge type coating device by the 2nd Embodiment of this invention. It is a longitudinal cross-sectional view which expands and shows the cylinder in FIG. It is a disassembled longitudinal cross-sectional view shown in the state which decomposed | disassembled the rotary atomization head, the shaping air ring, and the air motor in order to remove a cylinder. It is a longitudinal cross-sectional view which shows the front side part of the cartridge type coating device by a 1st modification. It is a longitudinal cross-sectional view which expands and shows the cylinder in FIG. It is a longitudinal cross-sectional view which shows the front side part of the cartridge type coating device by a 2nd modification. It is a longitudinal cross-sectional view which expands and shows the cylinder in FIG. 10 alone. It is a longitudinal cross-sectional view which shows the cylinder by a 3rd modification alone. It is a longitudinal section showing the cylinder by the 4th modification alone.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cartridge type coating device 2,31 Housing 3,32 Motor attachment part 4 Cartridge attachment part 6 Air motor 7 Motor case 8 Rotating shaft 8A Inner peripheral surface 11 Rotating atomizing head 12 Shaping air ring 17 Cartridge 18 Tank part 22 Feed tube 26, 33, 41, 51, 61, 71 Cylindrical body 26A, 33A, 41A, 51A, 61A, 71A Body portion 26B, 41B, 61B, 71D Backflow prevention portion 26C, 33B, 41C, 51B, 61C, 71B Stopper 26D, 33C, 41D, 51C, 61D, 71C Partition part 61E Other backflow prevention part

Claims (5)

A housing in which the front side is a motor mounting portion and the rear side is a cartridge mounting portion;
An air motor having a hollow rotating shaft attached to the motor mounting portion of the housing and extending in the axial direction toward the front;
A rotary atomizing head that is attached to a front end portion of a rotary shaft of the air motor and sprays paint supplied while rotating by the air motor;
A tank part for storing paint and a feed tube formed to extend forward from the tank part. When the paint tube is attached to the cartridge attachment part of the housing, the feed tube is inserted into the rotating shaft of the air motor. In a cartridge type coating apparatus comprising a cartridge that discharges toward the rotary atomizing head,
A cylindrical body that covers at least the front end portion of the inner peripheral surface of the air shaft from the front end portion to an intermediate position in the axial direction is attached to the rotary shaft of the air motor and is detachable. A cartridge-type coating device characterized by preventing the paint from adhering to the surface.   The cartridge type coating apparatus according to claim 1, wherein the cylindrical body is provided with a stopper for positioning in the insertion direction when inserted into the rotating shaft.   The cartridge type coating apparatus according to claim 1 or 2, wherein the cylindrical body is provided with a backflow prevention portion for preventing the adhering paint from flowing backward from the front end portion in the reverse direction.   4. The cartridge type coating apparatus according to claim 1, wherein the cylindrical body is configured to be inserted in a state of rotating integrally with a rotary shaft of the air motor and detachable from a front end side of the rotary shaft.   4. The cartridge according to claim 1, 2, or 3, wherein the cylindrical body is configured to be inserted in a non-rotating state with respect to a rotation shaft of the air motor and detachably inserted from a rear end side of the rotation shaft toward a front end portion. Painting equipment.

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