JPH0711801Y2 - Spray gun - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention relates to a spray gun in which paint is sprayed from a tip of a barrel by opening a shutoff valve by a trigger operation, and in particular, a shutoff valve. The present invention relates to a spray gun in which the structure of the valve body and the valve rod is improved.

Problems to be Solved by Conventional Techniques and Inventions A conventional spray gun is formed in a valve chamber by forming a valve chamber in the gun body that communicates with a paint supply source and a paint ejection port at the tip of the barrel. A normally closed paint on-off valve is constructed by pressing the valve bodies, which are provided with protruding valve rods through the sliding holes on the entire surface of the gun body, to the valve openings by means of spring elasticity. By pulling the trigger that engages the end and pushing in the valve rod, the valve body is separated from the valve opening against the spring elasticity and the valve opening is opened, so that the paint is ejected from the paint ejection port. However, conventionally, since the valve body of the on-off valve and the valve rod are integrally formed, for example, the axial center of the sliding hole into which the valve rod is fitted is formed deviated from the axial center of the valve opening. If the valve body is not properly pressed against the center of the valve opening, leakage may occur, and the valve rod and sliding hole If there is rattling in the mating part of, when the spring force acts on one side, the valve rod tilts in the sliding hole and slides in that tilted state, preventing smooth pushing of the valve rod. In addition, since there is a possibility of causing early wear, high processing accuracy is required, and there is a drawback that the manufacturing cost is high.

As a means for solving the above problems, as a means for solving the above problems, the spray gun of the present invention comprises a paint sprayer provided at the tip of a barrel and an inflow chamber communicating with a paint supply source in the gun body. The outflow chamber that communicates with the outlet is connected, the valve body is pressed against the valve opening provided between the two chambers with spring elasticity, and the valve rod is slidably fitted into the sliding hole provided in the gun body. Wear it and abut one end against the valve,
The other end of the valve rod protruding from the gun body is made to correspond to a trigger pivotally supported on the gun body.

The operation and effect of the present invention With the above-mentioned configuration, when the trigger is pulled to push the valve rod, the valve body is pushed by the valve rod and is separated from the valve opening against the spring resilience, so that the valve opening is opened. The paint that is opened and supplied into the inflow chamber is supplied from the outflow chamber to the paint ejection port through the valve port, and when the trigger is released, the valve body is pressed against the valve port by pushing the valve rod back by the spring elasticity. By closing the valve, the supply of paint or air to the paint outlet or the air outlet is stopped, and the valve body and the valve rod are separated from each other so that they are abutted against each other. Even if the axis of the rod's sliding hole is displaced from the axis of the valve opening, the valve body that receives spring elasticity presses against the valve opening properly so that leakage does not occur regardless of the position of the valve rod. In addition, there is some rattling in the fitting part between the valve rod and the sliding hole, Even if the valve is tilted due to the bias of the spring force, the valve rod does not receive the tilting force from the valve body, and the valve rod can slide smoothly in the sliding hole without tilting. Assembling work is possible because the precision of the slide hole formation position and the machining precision of the fitting portion of the valve rod and the slide hole can be kept low, and the valve disc and valve rod are divided into two parts. Also, there is an effect that the manufacturing cost can be reduced.

Embodiment An embodiment in which the present invention is applied to a spray gun for air spray type electrostatic coating will be described below with reference to FIGS. 1 and 2.

In the spray gun of this embodiment, the paint supplied under pressure from a paint supply source (not shown) and the compressed air supplied from a compressor (not shown) are supplied to the paint inflow passage 3 and the air inside the grip 2 of the gun body 1, respectively. Through the inflow passage 4, it is led to an on-off valve 6 for paint formed on the right side of the upper part of the gun body 1 and an on-off valve 7 for compressed air formed on the left side of the gun body 1.
When a trigger 9 which is freely swingably attached to the support shaft 8 is pulled, both on-off valves 6 and 7 are opened, the paint passes through a paint outflow passage 11 in the barrel 10, and a nozzle mounted at the tip thereof. At the same time that the compressed air is led to 12, the atomization air outlet 13
Through the air outlet 14 around the nozzle 12 and partly through the air outflow passage 15 for pattern control
The paint sprayed from the paint spray port 17 of the nozzle 12 is atomized by the compressed air sprayed from the air spray port 14 for atomization, and compressed air sprayed from the air spray port 16 for pattern control. Is discharged with a constant pattern diameter by the, and is negatively charged and positively charged by the electrode 19 connected to a high voltage generator (not shown) via the high voltage cable 18 guided into the barrel 10. It is designed to be applied by being attracted to the object to be coated.

As shown in detail in FIG. 2, the open / close valve 6 for paint described above penetrates the right side of the upper part of the gun body 1 in the front-rear direction and has a stepped hole 20
Is formed, and a screw lid 21 is screwed into the rear end portion of the same to close it, thereby forming an inflow chamber 23 communicating with the paint inflow passage 3 and the inflow port 22 and in front of the inflow chamber 23. A bottomed cylindrical mounting body 25 is screwed to the front end of the stepped hole 20 to communicate with the paint outflow passage 11 through the outflow port 26. An outflow chamber 27 having a diameter larger than that of the inflow chamber 23 is formed, and a valve opening 29 is formed at the center of the stepped portion at the rear end of the outflow chamber 27.
And a plurality of axial relief grooves 30 are formed on the outer peripheral portion of the valve seat ring 28 at intervals in the circumferential direction. A first compression member is provided between a seat plate 31 having a relief groove 32 formed in its portion aligned with the relief groove 30 and a spring bearing 34 applied to the rear surface of the mounting body 25 via three bearing plates 33. A coil spring 35 is attached, and the valve seat ring 28 is pressed against the stepped portion by its elasticity, and the valve body 3 having a truncated cone-shaped head portion 37a in the inflow chamber 23.
7 was accommodated and mounted between the screw lid 21 and
The second compression coil spring 39, which has a smaller elastic force than the first compression coil spring 35, is always pressed against the edge of the valve opening 29 of the valve seat ring 28 to close the valve. On the inner circumference of 25, a screw portion 43 projecting at the rear end of a stopper 41 having a protruding surface 42 for adjusting the pulling margin of the trigger 9 formed on the front surface is screwed so as to adjust the screw forward, and is transparently provided at the center thereof. In the sliding hole 44
The front end of the stepped valve rod 45 is slidably fitted, and the reduced rear end thereof penetrates the bottom of the mounting body 25 and the center holes 25a and 33a of the bearing plate 33 to form the outflow chamber 27. It is applied to the front surface of the valve element 37 through the inside thereof, and the tip of the valve rod 45 is always at a position apart from the pressing surface 9a of the trigger 9 in a state where the pulling operation is not performed.

On the other hand, the on-off valve 7 for compressed air is constructed by screwing a screw lid 48 to the rear end of the stepped hole 47 formed in the upper left side of the gun body 1 in the front-rear direction. Inlet 4 to 49
An inflow chamber 50 communicating with the stepped hole 47 is formed.
By screwing the sealing body 51 to the front end of the so as to adjust the screw forward, the outflow chamber communicating with the atomizing air outflow passage 13 and the pattern control air outflow passage 15 via the outlets 52 and 53, respectively. 54 is formed, a valve seat ring 57 having a valve opening 58 is fitted to a stepped portion at the front end of the inflow chamber 50, and a valve having a frustoconical head 60a in the inflow chamber 50. The body 60 is accommodated and is pressed against the valve opening 58 of the valve seat ring 57 by the elasticity of the third compression coil spring 61 mounted between the body 60 and the screw lid 48, and is always closed. A valve rod 64 is provided in a sliding hole 63 formed through the body 51.
Is slidably fitted, its rear end passes through the outflow chamber 54 and is applied to the front surface of the valve body 60, and the tip protruding from the front surface of the sealing body 51 is applied to the pressing surface 9a of the trigger 9. In addition, a slope 55 is formed on the rear end surface of the sealing body 51 protruding into the outflow chamber 54, and the pattern control is performed by changing the screwing amount of the sealing body 51 and changing its direction and position. This is to adjust the opening degree of the outlet 53 of the air for use.

The present embodiment has such a structure, and when the trigger 9 is pulled,
First, the valve body 64 of the on-off valve 7 for compressed air is pushed in, and the valve body 60 is pushed by the valve rod 64 to separate the third compression coil spring 61 from the valve seat ring 57 and separate it from the valve opening 58. The compressed air supplied to the inflow chamber 50 flows from the valve port 58 to the outflow chamber 54, flows through the two outflow ports 52 and 53, and flows into the atomizing air outflow passage 13 and the pattern control air outflow passage 15. On-off valve 6 for paint
The valve rod 45 of the second compression coil spring 39 is also pushed by the trigger 9 after the trigger 9 is pulled for a certain distance, and the valve body 37 is pushed by the valve rod 45.
The valve opening 29 is opened apart from the valve seat ring 28 while compressing the fluid, and the paint supplied to the inflow chamber 23 flows from the valve opening 29 to the outflow chamber 27 and is supplied to the paint outflow passage 11 from the outflow port 26. When the trigger 9 is held at the position where it hits the abutting surface 42, the opening of the valve port 29 is held at a constant opening determined by the screwing position of the stopper 41, and a constant flow rate of the paint flows to the paint outflow passage 11. When the trigger 9 is released, the valve elements 37 and 60 of the on-off valves 6 and 7 move the valve rods 45 and 64 by the restoring elasticity of the second compression coil spring 39 and the third compression coil spring 61, respectively. Valve seat ring 28 while returning to the front,
As they move to the 57 side and have the frustoconical heads 37a and 60a, they are aligned and pressed against the valve openings 29 and 58, so that both valve openings 29 and 58 are tight. And the supply of paint and compressed air is stopped.

In this stopped state, the pressure of the paint supplied to the inflow chamber 23 becomes high due to a failure of the regu- lator connected to the paint inflow passage 3 and the pressure of the paint acting on the rear surface side of the valve seat ring 28 is reduced. When the total elastic force of the second compression coil spring 39 becomes larger than the elastic force of the first compression coil spring 35 acting on the front surface side, the valve seat ring 28 elastically contracts the first compression coil spring 35 and the outflow chamber 27 of the outflow chamber 27. The paint in the inflow chamber 23 separates forward from the rear end and flows into the outflow chamber 27 through the relief grooves 30, 32 on the outer periphery of the valve seat ring 28 and the seat plate 31, and passes through the paint outflow passage 11 to the nozzle 12 of the nozzle 12. It escapes to the outside from the paint jet 17.

In the present embodiment, in the on-off valves 6 and 7 for paint and air, the valve bodies 37 and 60 are separated from the valve rods 45 and 64, respectively, so that the sliding holes 44 of the valve rods 45 and 64 are formed. , 63 axes correspond to the corresponding valve ports
Even when deviated from the axes of 29 and 58, when the valve is closed, the valve bodies 37 and 60 are irrelevant to the positions of the valve rods 45 and 64.
Since the second compression coil spring 39 and the third compression coil spring 61 are aligned by the elastic force and pressed against the valve openings 29 and 58, there is no risk of paint or air leakage, and the valve rods 4
Even if the valve bodies 37 and 60 are tilted due to the bias of the spring force, etc., due to slight rattling in the fitting portions of the sliding holes 44 and 63 with the sliding holes 44 and 63, Since 45 and 64 are separate from the valve bodies 37 and 60 and do not receive tilting force, the valve rods 45 and 64 have sliding holes 44,
In the above embodiment, the spray gun for air spray type electrostatic coating is exemplified, but the present invention is not limited to this and is not limited to this. The same can be applied to other types of spray guns such as those of the air spray type, and those of the air spray type for electrostatic coating and non-electrostatic coating.

[Brief description of drawings]

FIG. 1 is a partially cutaway side sectional view of an embodiment of the present invention, and FIG. 2 is a partially cutaway plan sectional view thereof. 1: Gun body, 3: Paint inflow path, 4: Air inflow path, 9: Trigger,
10: Barrel, 11: Paint outlet, 12: Nozzle, 13, 15: Air outlet, 14, 16: Air outlet, 17: Paint outlet, 23: Inlet chamber, 2
7: Outflow chamber, 29: Valve mouth, 37: Valve body, 39: Second compression coil spring, 44: Sliding hole, 45: Valve rod, 50: Inflow chamber, 54: Outflow chamber, 58:
Valve port, 60: valve body, 61: third compression coil spring, 63: sliding hole, 6
4: Bento

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. A gun body comprising an inflow chamber communicating with a paint supply source and an outflow chamber communicating with a paint ejection port provided at a tip of a barrel, and a valve port provided between the chambers. The valve body is pressed by a spring elastic force to the valve body, and the valve rod is slidably fitted in a sliding hole provided in the gun body so that one end of the valve rod abuts against the valve body. A spray gun characterized in that the protruding other end corresponds to a trigger pivotally supported on the gun body.