JP2012217952A - Spray type coating apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spray type coating apparatus capable of coating a coated object uniformly with liquid.SOLUTION: The spray type coating apparatus 1 includes a grease pump 3 force-feeding grease stored in a container 6; a discharge nozzle 42 spraying the grease force-fed by the grease pump 3, to a gear 2; and a compressed air source 28 for force-feeding air. The discharge nozzle 42 has a liquid discharge port communicating with the grease pump 3 to discharge force-fed grease, and an air ejection port communicating with the compressed air source 28 and formed to surround the periphery of the liquid discharge port.

Description

  The present invention relates to a spray-type coating device for spraying grease or the like onto an object to be coated, for example.

  2. Description of the Related Art Conventionally, an apparatus for applying a liquid (high viscosity fluid) such as grease stored in a drum can or a pail can to an object to be coated is known. This type of device is connected to a pump body for pumping liquid, a metering valve for adjusting the flow rate and flow rate of the liquid, and a pump body via a high-pressure hose, and the grease pumped by the pump body is to be coated. A discharge nozzle for discharging toward the nozzle. As the pump body, for example, an air-type plunger pump that operates by compressed air is used (for example, see Patent Document 1).

JP 2002-357178 A

  However, in the above-described conventional technology, there is a problem that the liquid discharged from the discharge nozzle does not spread evenly on the object to be coated, and application unevenness occurs without being applied to the object to be coated in a required amount.

  Accordingly, the present invention has been made in view of the above-described circumstances, and provides a spray-type coating apparatus that can uniformly apply a liquid to an object to be coated.

  In order to solve the above-mentioned problem, the invention described in claim 1 includes a liquid pump that pumps the liquid contained in a container, a discharge nozzle that sprays the liquid pumped by the liquid pump onto an object to be coated, A spray-type coating apparatus including an air pump that pumps air, wherein the discharge nozzle is communicated with the liquid pump, and is communicated with a liquid discharge port that discharges the pumped liquid, and the air pump. And an air discharge port formed so as to surround the periphery of the liquid discharge port.

  With this configuration, compressed air can be ejected from the periphery of the liquid discharge port, so that the liquid discharged from the liquid discharge port is caught in the flow of compressed air and blown away. For this reason, a liquid can be apply | coated to a to-be-coated object evenly.

  The invention described in claim 2 includes a liquid quantification device capable of adjusting at least one of a flow rate and a flow rate of the liquid pumped from the liquid pump, and the liquid pump and the discharge nozzle include the liquid It is connected through a quantification device.

  With this configuration, a desired amount of liquid can be reliably applied to the object to be coated, and the quality of the object to be coated can be improved.

  According to the present invention, since compressed air can be ejected from the periphery of the liquid discharge port, the liquid discharged from the liquid discharge port is caught in the flow of compressed air and blown away. For this reason, a liquid can be apply | coated to a to-be-coated object evenly.

It is a schematic block diagram of the spray type coating device in embodiment of this invention. It is a principal part enlarged view of the grease spray application | coating gun in embodiment of this invention. It is behavioral explanatory drawing of the grease discharged from the discharge nozzle in the embodiment of the present invention.

(Spray type coating device)
Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic configuration diagram of a spray-type coating apparatus 1.
As shown in the figure, the spray-type coating device 1 is for applying grease (not shown) to a gear 2 that is an object to be coated, and a grease pump 3 and a grease spray coating gun 4 are provided with a metering valve. 5 are connected.

(Grease pump)
The grease pump 3 is composed of a pail can or the like, and includes a container 6 in which grease (not shown) is accommodated, and a pump body 8 that pumps the grease in the container 6 to the metering valve 5 via the high-pressure hose 7. Yes.
The pump body 8 is a so-called pneumatic plunger pump that is operated by compressed air from a compressed air supply means (not shown), and is supported by a pump frame 9. The pump main body 8 includes a cylinder portion 10 and a piston 11 that can move forward and backward in the cylinder portion 10 along the axial direction. The piston 11 is moved forward and backward in the cylinder portion 10 by compressed air, so that grease is pumped to the metering valve 5 through the high-pressure hose 7.

(Quantitative valve)
The metering valve 5 is for adjusting the flow rate and flow rate of the grease pumped from the grease pump 3 and supplying a predetermined flow rate to the grease spray application gun 4 at a predetermined flow rate. The metering valve 5 has a casing 21, and a piston 22 and a restrictor 23 are provided in the casing 21.

  A suction port 24 to which the grease pumped from the grease pump 3 is supplied is opened at the lower part of the casing 21 (lower part in FIG. 1). In addition, a discharge port 25 for discharging grease to the grease spray application gun 4 is opened slightly above the suction port 24 of the casing 21 and on the same plane as the suction port 24. One end of the high-pressure hose 7 connected to the grease pump 3 is connected to the suction port 24.

  The suction port 24 and the discharge port 25 communicate with each other in the casing 21, and the piston 22 provided in the casing 21 communicates with the suction port 24 and the discharge port 25. An air piston (not shown) is provided in the casing 21 so as to be slidable in the casing 21. The air piston (not shown) slides by the compressed air supplied from the air port 26 provided in the upper part of the casing 21 (upper part in FIG. 1), and the communication state of the suction port 24, the discharge port 25, and the piston 22 is changed. It is configured to be switchable.

More specifically, when an air piston (not shown) slides to one side, the suction port 24 and the piston 22 are communicated with each other, and the piston 22 and the discharge port 25 are disconnected. When an air piston (not shown) slides to the other side, the suction port 24 and the piston 22 are disconnected, and the piston 22 and the discharge port 25 are communicated.
Here, a compressed air source 28 composed of an air compressor or the like is connected via an air hose 27 to an air port 26 to which compressed air serving as a power source for the air piston is supplied, and the compressed air source 28 is connected to an electromagnetic valve 66. Compressed air is supplied.

  The piston 22 communicating with the suction port 24 and the discharge port 25 is disposed on the opposite side (right side in FIG. 1) of the casing 21 to the side where the suction port 24 and the discharge port 25 are opened. And it has a piston rod (not shown) that can move forward and backward toward the suction port 24 and the discharge port 25 side. The forward / backward movement amount of the piston rod can be adjusted by an adjusting screw 29 provided on the base end side (right end side in FIG. 1).

Under such a configuration, the hydraulic pressure of the grease supplied to the suction port 24 acts on the back pressure side of a piston rod (not shown). Thereby, a force is always applied to the piston rod (not shown) in the direction in which the grease in the piston 22 is discharged.
Further, when the grease flows into the piston 22, a differential pressure is generated between the inside of the piston 22 and the back pressure side of the piston rod, and the grease flows into the piston 22 and is filled. Yes. Thus, the piston 22 discharges grease toward the discharge port 25 using the discharge pressure from the grease pump 3.

Here, the forward / backward movement amount of the piston rod (not shown) of the piston 22 can be adjusted by the adjusting screw 29, so that the flow rate of the discharged grease is adjusted by the adjusting screw 29.
The discharge port 25 is provided with a restrictor 23, and the grease spray application gun 4 is connected via the restrictor 23 and the high-pressure hose 31. The restrictor 23 is for adjusting the flow rate of the grease discharged from the discharge port 25.

(Grease spray application gun)
FIG. 2 is an enlarged view of a main part of the grease spray application gun 4.
As shown in FIGS. 1 and 2, the grease spray application gun 4 is composed of a cylinder part 41 and a discharge nozzle 42 provided at the tip of the cylinder part 41 (left end in FIG. 1). The cylinder portion 41 is provided with a suction port 46 to which the grease pumped from the metering valve 5 is supplied. As a result, the cylinder portion 41 is filled with grease.

  Further, a piston (not shown) is provided in the cylinder portion 41 so as to be capable of moving forward and backward. Further, an air port 43 is opened in the cylinder portion 41, and this air port 43 is connected to an electromagnetic valve 66 through an air hose 44. As a result, compressed air is supplied into the cylinder portion 41 via the electromagnetic valve 66, and a piston (not shown) moves forward and backward, whereby the grease is pumped to the discharge nozzle 42.

Here, an adjustment screw 45 is provided at the base end (the right end in FIG. 1) of the cylinder portion 41, and the amount of movement of the piston (not shown) can be adjusted by the adjustment screw 45. This makes it possible to adjust the amount of grease discharged by the grease spray application gun 4 itself.
Further, a constricted portion 47 is formed on the distal end side of the cylinder portion 41, and a nozzle mounting flange portion 48 is further formed at the distal end of the constricted portion 47. A discharge nozzle 42 is attached to the nozzle attachment flange portion 48.

  As shown in detail in FIG. 2, the discharge nozzle 42 includes an inner tube 51 that is disposed on the axis and an outer tube 52 that is externally fitted to the inner tube 51. The inner pipe 51 is formed with a grease discharge port 53 communicating with the inside of the cylinder portion 41 at the axial center. Further, a tubular air discharge port 54 is formed in the inner tube 51 so as to surround the periphery of the grease discharge port 53.

  Further, the inner pipe 51 is formed with an air flow path 56 that connects a spraying air port 55 formed in the outer pipe 52 described later and the air discharge port 54 over the entire circumference. A male threaded portion 57 is engraved at the tip of the inner tube 51, and a female threaded portion 58 of the outer tube 52 that is externally fitted to the inner tube 51 is screwed therein.

The outer tube 52 is formed in a substantially columnar shape, and has a tapered portion 61 at the tip (left end in FIG. 2). The outer tube 52 is formed with a hole 59 that can be fitted around the inner tube 51 in the axial center. Then, in a state where the outer tube 52 is externally fitted to the inner tube 51, a female screw portion 58 is engraved at a position corresponding to the male screw portion 57 of the hole 59.
Further, the outer pipe 52 is formed with a seal groove 63 for mounting a seal member 62 such as an O-ring at the base end (right end in FIG. 2). By mounting the seal member 62 in the seal groove 63, the sealing performance between the discharge nozzle 42 and the nozzle mounting flange portion 48 of the cylinder portion 41 can be ensured.

In addition, a grease discharge port 53 that passes through the axis of the inner tube 51 is formed in communication with the outer tube 52, and the grease discharge port 53 is opened at the tip of the outer tube 52. Further, an air discharge port 54 of the inner tube 51 is formed in communication with the outer tube 52, and the air discharge port 54 is opened at the tip of the outer tube 52.
The outer pipe 52 is formed with a spraying air port 55 at a position corresponding to the air flow path 56 of the inner pipe 51. An electromagnetic valve 66 is connected to the spraying air port 55 via an air hose 64.

Thereby, compressed air is supplied from the compressed air source 28 to the air discharge port 54 via the electromagnetic valve 66. A regulator 65 is provided in the middle of the air hose 64 that connects the spraying air port 55 and the electromagnetic valve 66. The regulator 65 is for adjusting the pressure of the compressed air supplied to the air discharge port 54.
Here, the other end of the air hose 27 whose one end is connected to the air port 26 of the metering valve 5 and the air hose 44 whose one end is connected to the air port 43 opened in the cylinder portion 41 of the grease spray coating gun 4 The other end is directly connected to the compressed air source 28 without going through the regulator 65.

(Operation of spray coating device)
Next, based on FIG. 1, FIG. 3, operation | movement of the spray type coating device 1 is demonstrated.
FIG. 3 is an explanatory diagram of the behavior of the grease discharged from the discharge nozzle 42, and corresponds to FIG.
As shown in FIG. 1, first, the grease pump 3 is driven in a state where the tip of the discharge nozzle 42 of the grease spray application gun 4 is directed to the gear 2 that applies grease, and the grease is supplied to the metering valve 5. At this time, the metering valve 5 is in a state where the suction port 24 and the piston 22 communicate with each other, and the piston 22 is filled with grease.

  Subsequently, compressed air is supplied from the compressed air source 28 to the air port 26 of the metering valve 5 through the air hose 27, and compressed air is supplied to the air port 43 of the grease spray application gun 4 through the air hose 44. Compressed air is supplied to the spraying air port 55 via the hose 64. Supply of compressed air to these air ports 26, 43, and 55 is performed simultaneously.

  Then, an air piston (not shown) slides in the metering valve 5, the connection between the suction port 24 and the piston 22 is cut off, and the piston 22 and the discharge port 25 are communicated. Then, the grease is supplied to the suction port 46 opened in the cylinder portion 41 of the grease spray application gun 4 via the restrictor 23 and the high pressure hose 31.

  As shown in detail in FIG. 3, the grease supplied to the suction port 46 is discharged from the tip of the discharge nozzle 42 through the grease discharge port 53. At this time, compressed air is discharged from the air discharge port 54 at the tip of the discharge nozzle 42. For this reason, the grease discharged from the grease discharge port 53 is caught in the flow of compressed air and blown away. Here, since the grease has a high viscosity, even when it is caught in a flow of compressed air and blown away, the grease is discharged so as to extend uniformly and thinly on the coating surface.

Therefore, according to the above-described embodiment, grease can be uniformly applied to the entire gear 2.
Further, when supplying the grease from the grease pump 3 to the grease spray application gun 4, the grease is supplied through the metering valve 5, so that a desired amount of grease is supplied to the grease spray application gun 4, The desired flow rate can be supplied. In the present embodiment, the gear 2 is held by a jig (not shown) so as to be rotatable about the central axis of the gear 2, and the gear 2 is rotated in synchronization with the supply of the grease, so that the grease to the gear 2 is rotated. The amount of coating is controlled. For this reason, since the state of the grease applied to the gear 2 can be managed with high accuracy, the quality of the gear 2 in a state where the grease is applied can be improved.

The present invention is not limited to the above-described embodiment, and includes various modifications made to the above-described embodiment without departing from the spirit of the present invention.
For example, in the above-described embodiment, the case where grease is applied to the gear 2 using the spray application device 1 has been described. However, the present invention is not limited to this. Grease can be applied to various parts such as a worm gear and a screw in place of the gear 2 by using the spray application device 1.

  Moreover, in the above-mentioned embodiment, the case where the high-viscosity grease was sprayed using the spray-type coating device 1 has been described. However, the present invention is not limited to this, and the spray coating apparatus 1 can be used for various liquids. In this case, instead of the grease pump 3 depending on the viscosity and type of the liquid, a pump that can handle the liquid is used, and a metering valve that can handle the liquid is used instead of the metering valve 5. On the other hand, the grease spray application gun 4 does not need to be changed in configuration itself, and can be dealt with by adjusting the pressure of the compressed air supplied to the air discharge port 54 by the regulator 65.

  Furthermore, in the above-described embodiment, the case has been described in which the metering valve 5 is capable of adjusting the grease discharge flow rate and the discharge flow rate. However, the present invention is not limited to this, and the metering valve 5 may be configured to be capable of adjusting at least one of the grease discharge flow rate and the discharge flow rate. The state of the grease applied to the gear 2 can be managed by adjusting at least one of the grease discharge flow rate and the discharge flow rate.

1 Spray type coating device 2 Gear (to be coated)
3 Grease pump (liquid pump)
4 Grease spray application gun 5 Metering valve (Liquid quantification device)
6 Container 28 Compressed air source (air pump)
42 discharge nozzle 53 grease discharge port (liquid discharge port)
54 Air outlet

Claims (2)

A liquid pump for pumping the liquid contained in the container;
A discharge nozzle that sprays the liquid pumped by the liquid pump onto an object to be coated;
A spray-type coating device comprising an air pump for pumping air,
The discharge nozzle is
A liquid discharge port that communicates with the liquid pump and discharges the pumped liquid;
A spray-type coating apparatus, comprising: an air discharge port that communicates with the air pump and is formed so as to surround the periphery of the liquid discharge port. A liquid quantification device capable of adjusting at least one of a flow rate and a flow rate of the liquid pumped from the liquid pump;
The spray-type coating device according to claim 1, wherein the liquid pump and the discharge nozzle are connected via the liquid quantification device.

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