JP6060323B2 - Swivel sprayer - Google Patents

Description

The present invention relates to a swirl type thermal spraying apparatus. For example, as a countermeasure against corrosion of high strength bolts (HTB, TCB) and nuts used in steel structures such as bridges, JIS H 8300: 2005 “Zinc” is used.・ Aluminum, zinc-aluminum alloys and aluminum-magnesium alloys, etc., which are applied for the purpose of corrosion protection of steel as specified in “Thermal spraying of aluminum and their alloys” The present invention relates to a swirl type thermal spraying apparatus for forming a film.

As a countermeasure against corrosion of a steel structure such as a steel girder of a thermal spraying apparatus road bridge, a high corrosion resistance coating is formed by spraying a high corrosion resistance alloy on the surface of the steel structure in a factory.
This type of steel structure requires on-site connection because of its structure, and is connected by a high-strength bolt using an attachment plate at the site. However, the high-strength bolts and nuts themselves are not formed with a high corrosion-resistant coating like the steel structure body, so the service life of the high-strength bolts is shorter than that of the steel structure body. It is necessary to perform maintenance according to the number of years.

As with the surface of steel structures, it is desirable to form a high corrosion resistance film on high strength bolts. The bolt main body, the threaded portion, the nut, the washer, and the like are coated with a sprayed layer having a thickness of 10 to 150 μm made of a metal such as molybdenum, chromium, tungsten, or an aluminum magnesium alloy.
When forming a rust-proof spray coating on a high-strength bolt, to prevent the seizure of the steel structure surface from the rust-proof spray coating and to give an appropriate tightening force when tightening the steel structure, The rust-proof spray coating is formed on the entire surface including the screw portion from the head, and the nut that is fastened to the screw portion of the bolt excludes the contact surface between the inner screw portion and the rust-prevention spray coating on the steel structure surface. A rust-proof spray coating is formed on the entire surface.

  Conventionally, the coating of these sprayed layers is generally unsafe because it is performed by a worker manually using a plasma spray gun, for example, by holding bolts and nuts one by one within the constraints of the sprayed part. Moreover, there are many methods that are extremely inefficient and have low productivity. For this reason, the quality is not stable as described below and the deterioration is rapid.

Recently, there is a rotary type that sprays a thermal spray nozzle by rotating the periphery of a material to be sprayed, but since the spray nozzle rotates, the sprayed metal splashes and its yield is very bad and unsafe, There is also the problem of splash contamination. For this reason, the safety defense range by the sprayed metal splash is expanded, and the equipment cost is enormous.
The conventional thermal spraying methods have problems as described above, are unsafe, and have low productivity. In addition, the thickness of the sprayed layer is not uniform, the variation is large, the quality is not stable, and the problem of delay in delivery date and the fatal early deterioration are caused.
For example, the bolts, nuts, and washers as the fasteners described above have fatal defects as structures such as non-uniform spray coating thickness, reduced fastening force / axial force due to vibration loosening, and early corrosion. For this reason, especially in the case of producing a highly corrosion-resistant coating on a joining bolt such as a bridge, it must be replaced in about 20 years.
The present invention provides a swirl type thermal spraying apparatus that eliminates these problems.

The technical conditions that characterize the present invention to solve the above-described problem are as described in the following (1) if the description in Example 1 and FIGS.
(1), turn to the horizontal pivot intermittently every predetermined turning angle by the gantry (100) indexed rotating machine (200) installed in the central portion in the indexed rotating machine on the frame (100) (200) A table (300) is mounted, and an air chuck device (400) for gripping the sprayed object B is arranged on the outer periphery of the turntable (300) in a single or twin manner at the predetermined equal turning angle interval , and the turntable (300) is provided with a chuck rotating device (401) for rotating the air chuck device (400) around its axial center, and stopping the intermittent horizontal turning of the air chuck device (400) by the turntable (300). position Not the spraying of spray state (B) supply position for supplying the air chuck device (400) and (S1) and the spraying of the non-sprayed state (B The sprayed position spraying and (S2) spraying already be sprayed product (B) and a stowed position for releasing housing (S3), non wherein the spraying position (S2) gripped horizontally in the air chuck device (400) In the spray type thermal spraying device, the thermal spraying device (500) is disposed so as to be capable of thermal spraying on the thermal sprayed object (B), and the thermal spraying device (500) is capable of changing the spraying direction of the thermal spraying nozzle (501) . ,
The turntable (300) is a cylindrical body (300C) with a lid,
The air chuck device (400) is disposed on the outer peripheral portion of the cylindrical body (300C) with a lid of the turntable (300) so that the sprayed object (B) can be held in a horizontal state.
In the chuck rotating device (401) , rotating arms (402) are radially arranged in the cylindrical body (300C) with the lid of the turntable (300), and one of the rotating arms (402) is an air chuck device. (400) is connected to the shaft center of the rear part of the main body and the other is connected to the geared motor (406) via the timing pulley (403), the timing belt (404) and the timing pulley (405),
In the thermal spraying device (500), the thermal spray nozzle (501) is disposed above the sprayed object (B) that is horizontally held by the air chuck device (400) that arrives at the thermal spraying position (S2). > A swirl-type spraying device characterized by that.

(4) The thermal spraying device makes it possible to move the thermal spray nozzle closer to and away from the thermal spray object B held by the incoming air chuck device, or to change the horizontal turning angle and / or the vertical elevation angle of the spraying direction. It is characterized by that.

  According to the present invention, each time the rotation is stopped while intermittently swiveling a plurality of air chuck devices, the sprayed material B is sequentially supplied by the spray standby storage means, and the spraying nozzle position of the spraying device disposed at the center of the swirling is provided. A single or twin air chuck device arrives and the chuck is held in the optimal facing relationship position, and the sprayed material B that is gripped and rotated by the chuck is sprayed, and after spraying, it is sequentially collected and stored in the sprayed material storage position. To do.

For this reason, it is possible to spray a single or a plurality of sprayed materials B at an extremely safe and smooth speed and efficiency at the same time, greatly improving the amount of sprayed product per unit time, and the type of the sprayed material B By adjusting the rotation angle range and rotation speed of the sprayed material B by the chuck according to the restrictions on the sprayed part and the spraying part, the sprayed film is thickened, homogenized, and high yielded to achieve high corrosion resistance coating. The high-quality sprayed product B can be obtained with an optimum delivery date.

For this reason, when the sprayed material B is used for connection between structures and applied to the sprayed bolts and nuts developed by the applicant of the present invention, it becomes possible to achieve uniform thickness and uniform spraying as intended, When fastening, vibration loosening and corrosion can be prevented for a longer period, and the fastening force and axial force between the structures can be stabilized at a high level, eliminating any fatal defects as a structure. It is.
Moreover, the thermal spraying of the high corrosion resistance thermal spraying powder to the bolts and nuts for joining especially bridges and the like according to the present invention depends on the size configuration, and the impact vibration test is performed 500,000 times, 2 million times, 3 million times, 8 million times. In any of the cases, since the estimated axial force (kN) is stable in the range of 180 to 200, there is an excellent effect that the service life is estimated to be about 100 years or more as compared with 20 years of conventional thermal spraying.

FIG. 3 is an explanatory plan view of FIG. 2 in the embodiment of the present invention. FIG. 2 is an explanatory side sectional view of FIG. 1. FIG. 2 is an enlarged explanatory view of a main part of FIG. 1. In an Example, it is plane explanatory drawing which shows the example which provided the twin air chuck apparatus 400 in the same turning angle position of the turntable 300. FIG . It is explanatory drawing which introduces several well-known specific examples of the chuck apparatus used in the Example of this invention. It is sectional explanatory drawing which shows a plasma arc spray nozzle in an example of the spray nozzle of the thermal spray apparatus used in the Example of this invention.

  The form for implementing this invention is demonstrated in detail by the Example shown in FIGS. 1-4.

  As shown in FIGS. 1 to 3, the swirl type thermal spraying apparatus of the present invention has an index rotator 200 installed in the center of the gantry 100, and 72 deg. A turntable 300 for intermittent horizontal turning for each turning angle is mounted, and an air chuck device 400 for gripping the sprayed material B (in this example, a screw part or a head of a bolt) is attached to the outer periphery of the turntable 300 at the 72 degrees. These are arranged in a single or twin for every equal turning angle interval (in this example, five in a single arrangement), and a thermal spraying device (500) is provided at a predetermined position around the turntable 300.

The index rotator 200 supports the upper end of a saddle-shaped rotary drive shaft 202 that is rotationally driven via a speed reducer (not shown) of a timing motor 201 by connecting it to the center of the turntable 300. This connecting portion is provided with a slip ring 203 for power supply / signal wiring and a five-unit valve 204 for supplying air to the air chuck device 400.

The turntable 300 is provided with wheels 301 for turning at appropriate intervals around the lower surface, and a proximity switch 302 (for detecting the turning angle) for the 72-degree intermittent horizontal turning stop position of the air chuck device 400. In the vicinity of the outer peripheral surface, a supply position S1 for supplying the sprayed object B in an unsprayed state to the air chuck device 400, a spraying position S2 for spraying the sprayed object B in an unsprayed state, and a sprayed sprayed object An accommodation position S3 for releasing and accommodating B is set.
(However, the supply position S1 and the accommodation position S3 of the air chuck device may be the same position.)

The air chuck device 400 can be set and held at the optimum facing relationship position by being arranged on the extension line in the diameter line direction of the turntable so as to come to oppose the position of the thermal spray nozzle 501 of the thermal spray device 500. In this example, one unit is provided at each turning angle position.

Further, the air chuck device 400 is connected to a chuck rotating device 401 that rotates the air chuck device 400 itself around its axial center.

The air chuck device 400 of the present example grips the sprayed object B such as the bolt, nut, and washer with the chuck claws 400C, and a plurality of chuck claws 400C can be opened and closed.
The air chuck device 400 of this example has a general structure, and a plurality of chuck claws 400C project from the diaphragm, a piston is connected to the diaphragm, and the piston is driven by air to bend the diaphragm. The chuck claw 400C is opened and closed by this bending, and the chuck claw 400C is used to grip or release the workpiece to be sprayed B.
In the example of the chuck 400C claw, a twin chuck other than the triple chuck 400C1 shown in FIG. 5 may be used, and the specification may be selected according to the shape size configuration of the sprayed object B.

The chuck rotation device 401 is provided in the turntable 300, is connected to the rear portion of the main body of the air chuck device 400 and is arranged radially in the radial direction of the turntable 300, and the timing at which the rotation device 402 is mounted. The pulley 403 and the geared motor 406 that rotates the rotating arm 402 via the timing belt 404 and the timing pulley 405 are arranged on the timing table 403, and are set and arranged in the turntable 300 with an extremely efficient and safe layout. .

The air chuck device 400 of this example has one set for each turning angle position, but a plurality of sets, for example, twin (two sets) 400-1 and 400-2 may be arranged as shown in FIG.
In this case, the chuck rotating devices 401-1 and 401-2 share the geared motor 406, and the timing pulley 403-1 of the rotating arm 402-1 and the timing pulley 402-2 of the rotating arm 402-2 are connected to the timing belt 404. -2 and the air chuck devices 400-1 and 400-2 can be rotated simultaneously by the rotational drive of the geared motor 406.

In the present invention, the thermal spraying device (500) is not particularly limited, and may be selected and adopted from generally known thermal spraying devices according to the sprayed material and the sprayed material, for example, a plasma arc spraying device, A plasma spraying apparatus, an arc spraying apparatus, a so-called gas flame spraying apparatus that sprays a wire or powdered metal / ceramic plus tic using oxygen / fuel gas may be used.
An example of the thermal spraying apparatus (500) shown in FIG. 2 is the above-described generally known plasma arc thermal spraying apparatus 500, which mainly includes a thermal spray nozzle 501, a plasma gas supply apparatus for supplying plasma gas to the thermal spray nozzle 501, and a cooling device. Compressed air supply device for supplying compressed air, etc., a thermal spray wire supply device for supplying a thermal spray wire to the thermal spray nozzle 501, and a plasma power source device for supplying an electric power to the cathode and generating an arc root between the thermal spray wire of the anode And a thermal spraying robot including a thermal spraying unit 500U including a plasma spraying control device .
The thermal spray nozzle 501 is held by the tip arm 510 of the robot arm of the three joint arms 510, 520, and 530.

As shown in FIG. 6, the structure of the thermal spray nozzle 501 of this example includes a cathode 502 disposed in the center of the nozzle, a plasma gas spray nozzle 503 disposed in the periphery thereof, and double compressed air spray nozzles 504 and 505. It consists of a sprayed wire supply nozzle 507 that opens ahead of the compressed air injection nozzles 504 and 505 and supplies an anode sprayed wire 506. An arc root 508 is formed between the cathode 502 and the sprayed wire 506 while cooling the cathode 502 with compressed air. A plasma gas (also referred to as a plasma column) 509 is formed by flowing a plasma gas around it, and the thermal spray wire 506 is melted by the plasma jet 509 to form a jet of molten metal particles. Sprayed to form a sprayed coating.

As shown in FIG. 2, the plasma arc thermal spraying apparatus 500 of this example is arranged so that the thermal spray nozzle 501 can be sprayed on the sprayed object B held by the air chuck apparatus 400 arriving at the thermal spraying position S2. is there.
In the spraying position S2 where any one of the air chuck devices 400 stops at every turning angle of 72 degrees, the plasma arc spraying device 500 is applied to the sprayed object B which is gripped by the chuck claws of the air chuck device 400 and rotates. Thus, the thermal spray nozzle 501 can be moved up and down by the robot arm, can be moved close to and away from the horizontal motion, and the spray direction of the spray particles can be changed in the horizontal turning angle and / or the vertical elevation angle.
This adjusts the position of the optimum thermal spraying facing relationship with the chuck claw 400C of the air chuck device 400 that stops facing the thermal spray nozzle 501 position.

It is preferable that the plasma arc spraying device 500 and / or the air chuck device 400 is appropriately provided with a scattering prevention cover for preventing the molten particles splashed at the spraying position S2 from scattering to other than the spraying position.

  Since the swirl type thermal spraying apparatus of the present invention exhibits the above-described excellent operational effects, there is a great deal of contribution from the thermal spraying industry and the metal structure joining business industry.

100: Stand 200: Index rotator 201: Timing motor 202: Rotation drive shaft 203: Slip ring 204 for power supply / control signal wiring: 5 series valve 300 for air supply 300: Turntable 300C: Cylindrical cover with lid 301: Wheel 302: Proximity switch (for turning angle detection)
S1: Supply position S2: Thermal spray position S3: Storage position 400, 400-1, 400-2: Air chuck device 401, 401-1, 401-2: Chuck rotating device 400C1: Triple chuck claw 402, 402-1, 402 -2: Rotating arms 403, 403-1, 403-2: Timing pulleys 404, 404-1, 404-2: Timing belts 405, 405-1: Timing pulleys 406: Geared motors 407, 407-1, 407-2 : Air supply pipe 500: Plasma arc spraying apparatus 500 U: Thermal spray unit 501: Thermal spray nozzle 502: Cathode 503: Plasma gas spray nozzles 504 and 505: Compressed air spray nozzle 506: Spray powder for anode 507: Spray wire supply nozzle 508: Arc Root 509: Plasma jet B: Sprayed material

Claims (1)

Stand (100) in the central portion to the indexed rotating machine (200) set up, the frame (100) the index rotator turntable (300) for horizontally turning intermittently every predetermined turning angle by (200) on The air chuck device (400) for gripping the sprayed object B is arranged on the outer periphery of the turntable (300) in a single or twin manner at the predetermined equal turning angle interval , and the turntable (300) Is provided with a chuck rotating device (401) for rotating the air chuck device (400) around its axial center, and the position of the intermittent horizontal turning of the air chuck device (400) by the turntable (300) is not yet determined. spraying the spraying of spray state (B) a supply position for supplying the air chuck device (400) (S1) and the spraying of the non-sprayed state (B) That sprayed position and (S2) spraying already be sprayed product (B) and a stowed position for releasing housing (S3), the non spray state wherein the spraying position (S2) which is gripped in the air chuck device (400) The spraying device (500) is disposed so as to be sprayable on the sprayed material (B), and the spraying device (500) is a swirl type spraying device in which the spraying direction of the spraying nozzle (501) can be changed .
The turntable (300) is a cylindrical body (300C) with a lid,
The air chuck device (400) is disposed on the outer peripheral portion of the cylindrical body (300C) with a lid of the turntable (300) so that the sprayed object (B) can be held in a horizontal state.
The chuck rotating device (401) has a rotating arm (402) arranged radially in the cylindrical body (300C) with the lid of the turntable (300), and one of the rotating arms (402) is connected to the air chuck. The device (400) is connected to the shaft center of the rear part of the main body, and the other is connected to the geared motor (406) via the timing pulley (403), the timing belt (404) and the timing pulley (405).
In the thermal spraying device (500), the thermal spray nozzle (501) is disposed above the thermal spray object (B) that is horizontally held by the air chuck device (400) that arrives at the thermal spraying position (S2). > A swirl-type spraying device characterized by that.