A spray width quick adjustment device for a spray gun

Abstract

The invention discloses a spray amplitude rapid adjustment device for a spray gun, comprising a gun body, an adjustment hole, a main airflow channel, a secondary airflow channel and an air inlet channel are arranged on the gun body, the air inlet channel, the main airflow channel and the secondary airflow channel are all connected with the adjustment hole, the main airflow channel and the adjustment hole are connected to form an air outlet 1, the secondary airflow channel and the adjustment hole are connected to form an air outlet 2, the air inlet is formed at the connection between the air inlet channel and the adjustment hole, a rotatable adjustment valve stem is installed in the adjustment hole, an air guide groove is provided on the adjustment valve stem between the air inlet and the air outlet 1 or the adjustment hole, the air guide groove connects the air inlet and the air outlet 1, a control hole is also arranged on the outer surface of the adjustment valve stem, an air guide channel connecting the control hole and the air guide groove is arranged in the adjustment valve stem, and when the adjustment valve stem rotates, the control hole and the air outlet 2 can gradually change from a non-overlapping state to a completely overlapping state. The spray gun with the spray amplitude adjustment device has a simple structure, is easy to adjust and process, and has good sealing performance.

Description

Technical Field

[0001] The invention relates to a spray gun, in particular to a spray width quick adjustment device of the spray gun. Background Art

[0002] A spray gun is a tool used for spraying paint. The rear end of the spray gun is connected to compressed gas, and a spray pot for storing paint is installed on the spray gun. When the spray gun is working, the compressed gas is used to bring the paint out of the spray gun head and atomize the paint, thereby achieving a uniform spraying effect.

[0003] The patent number 201310352976.0 applied by our company discloses a spray gun provided with a stepless amplitude adjustment device and the stepless amplitude adjustment device thereof. The spray gun can quickly adjust the spray amplitude of the spray gun through the stepless amplitude adjustment device, so that the shape of the sprayed paint changes from a circle to an ellipse.

[0004] However, this structure has the following problems:

[0005] 1. As shown in FIG. 10 of the patent, the overall structure of the adjusting rotary rod is relatively complex. Both the main airflow groove and the secondary airflow groove are fan-shaped annular grooves, which need to be processed by a milling cutter. The processing speed is slow, the processing is difficult, and the production cost is high.

[0006] 2. Since the amplitude hole is a blind hole, it is difficult to process, and the flatness and processing accuracy of the bottom edge of the blind hole are poor. In order to avoid the right end edge of the regulating valve stem from contacting the bottom edge of the blind hole and causing jamming, the right end of the regulating valve stem is an arc surface. This results in a shorter contact length between the right end of the regulating valve stem and the amplitude hole, a worse positioning and guiding effect, and the right end of the regulating valve stem is prone to swinging, affecting the sealing performance between the regulating valve stem and the amplitude hole.

[0007] 3. In order to ensure the coaxiality between the regulating valve stem and the amplitude hole, a steel ball groove is provided at the right end of the regulating valve stem and a steel ball is installed, which makes the overall structure of the regulating valve stem and the spray gun more complicated and difficult to process and assemble.

[0008] 4. There is no circumferential limit device on the regulating valve stem, so the rotation range of the regulating valve stem is not restricted, making adjustment inconvenient. Summary of the invention

[0009] In view of the shortcomings of the prior art, the object of the present invention is to provide a spray width quick adjustment device for a spray gun, which has a simple structure, is easy to adjust and process, and has good sealing performance.

[0010] The above technical objectives of the present invention are achieved through the following technical solutions: a spray width rapid adjustment device for a spray gun, comprising a gun body, the gun body is provided with an adjustment hole, a main air flow channel, a secondary air flow channel and an air inlet channel, the air inlet channel, the main air flow channel and the secondary air flow channel are all connected to the adjustment hole, a first air outlet is formed at the connection between the main air flow channel and the adjustment hole, a second air outlet is formed at the connection between the secondary air flow channel and the adjustment hole, an air inlet is formed at the connection between the air inlet channel and the adjustment hole, the projections of the first air outlet and the second air outlet are staggered in the axial direction of the adjustment hole, the projections of the air inlet and the second air outlet are staggered in the axial direction of the adjustment hole, a rotatable regulating valve stem is installed in the regulating hole, an air guide groove is provided on the regulating valve stem between the air inlet and the first air outlet or the regulating hole, the air guide groove connects the air inlet and the first air outlet, a control hole is also provided on the outer surface of the regulating valve stem, an air guide channel connecting the control hole and the air guide groove is provided in the regulating valve stem, and when the regulating valve stem rotates, the control hole and the second air outlet can gradually change from a non-overlapping state to a completely overlapping state.

[0011] Through the above technical solution, a control hole is set on the outer side of the regulating valve stem, and the control hole is connected to the air guide groove through an air guide channel set in the regulating valve stem. By rotating the regulating valve stem, the overlap amount of the control hole and the second air outlet can be gradually adjusted, thereby controlling the amount of air entering the second air outlet, and then changing the spray amplitude of the spray gun.

[0012] Compared with opening a fan-shaped annular groove, drilling a hole on the regulating valve stem is more convenient to process, with less damage to the outer side of the regulating valve stem, and will not cause a significant impact on the fit between the regulating valve stem and the regulating hole, making it less likely to swing, so that the regulating valve stem and the regulating hole still have good sealing performance. Since the outer side of the regulating valve stem is still a complete annular surface, the coaxiality between the regulating valve stem and the control hole can be better guaranteed, and there is no need to set a steel ball for positioning, with a simple structure and easy assembly.

[0013] Preferably, the air guide channel includes an axial flow channel arranged along the axis direction of the regulating valve stem and a radial flow channel perpendicular to the axis of the regulating valve stem.

[0014] Through the above technical solution, the air guide channel is arranged in this way, making the processing of the air guide channel more convenient.

[0015] Preferably, the adjustment hole is a through hole.

[0016] Through the above technical solution, the adjustment hole is a through hole, and the drill bit or milling cutter completely penetrates the gun body during processing, so that the processing accuracy and surface accuracy of the control hole can be better guaranteed, and it is not easy to produce processing defects such as the bottom edge of the blind hole.

[0017] Preferably, the control hole is arranged radially along the regulating valve stem.

[0018] Through the above technical solution, the control hole is arranged vertically along the radial direction of the regulating valve stem, which is more convenient to process than the inclined arrangement and causes less damage to the surface of the regulating valve stem.

[0019] Preferably, the air guide groove is arranged on the regulating valve stem.

[0020] Through the above technical solution, the air guide groove is arranged on the regulating valve stem, which is more convenient to process and has lower production cost than being arranged in the regulating hole.

[0021] Preferably, sealing grooves are provided at both ends of the regulating valve stem, and sealing rings are installed in the sealing grooves.

[0022] Through the above technical solution, the setting of the sealing ring can prevent the compressed gas from leaking from the gap between the regulating valve stem and the control hole, causing waste of compressed gas.

[0023] Preferably, a flange is provided at one end of the regulating valve stem, a limiting groove is provided at one end of the regulating hole, and the flange is located in the limiting groove.

[0024] Through the above technical solution, the setting of the flange can limit the axial position of the regulating valve stem, making it easier to fix the regulating valve stem.

[0025] Preferably, a notch is provided on the flange, and a convex tooth is provided on the limiting groove, and the convex tooth is inserted into the notch to limit the rotation angle of the regulating valve stem.

[0026] Through the above technical solution, the setting of the notch and the convex teeth can limit the rotation angle of the regulating valve stem, making the adjustment more convenient, accurate and efficient.

[0027] Preferably, a knob is installed at the other end of the regulating valve stem, and the end of the knob contacts the gun body.

[0028] Preferably, the setting of the knob facilitates the rotation of the regulating valve stem on the one hand, and can fix the regulating valve stem on the other hand to prevent the regulating valve stem from falling out of one side of the limiting groove.

[0029] Compared with the prior art, the beneficial effects of the present invention are as follows: by redesigning the structure of the regulating valve stem and the regulating hole, the overall structure of the regulating valve stem is simpler, the processing is more convenient, the coaxiality between the regulating valve stem and the regulating hole can be better guaranteed, the swing of the regulating valve stem in the regulating hole is reduced, and a better sealing effect is obtained. By rotating the regulating valve stem circumferentially to adjust the spray gun spray amplitude, only a small angle is required to control the second outlet from fully open to fully closed, and the adjustment is more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 An exploded view of an embodiment;

[0031] Figure 2 It is the front view of the gun body;

[0032] Figure 3 for Figure 2 Schematic diagram of the cross section at AA in the middle;

[0033] Figure 4 This is a cross-sectional view of the adjustment hole after installation;

[0034] Figure 5 A three-dimensional diagram of a regulating valve stem;

[0035] Figure 6 It is a cross-sectional schematic diagram of the regulating valve stem;

[0036] Figure 7 This is an enlarged view of the limit groove.

[0037] Figure numerals: 1. gun body; 2. adjustment hole; 3. main air flow channel; 6. secondary air flow channel; 7. air inlet channel; 8. air outlet one; 9. air outlet two; 10. air inlet; 11. adjusting valve stem; 12. air guide groove; 13. control hole; 14. air guide channel; 15. axial flow channel; 16. radial flow channel; 17. sealing groove; 18. sealing ring; 19. flange; 20. convex tooth; 21. knob; 22. limit groove; 23. notch; 24. screw. DETAILED DESCRIPTION

[0038] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0039] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

[0040] like Figures 1 to 3As shown, a spray gun with an amplitude adjustment device comprises a gun body 1, on which an adjustment hole 2 is provided, a main airflow channel 3, a secondary airflow channel 6 and an air inlet channel 7 connected to the adjustment hole 2. An air outlet 1 8 is formed at the connection between the main airflow channel 3 and the adjustment hole 2, an air outlet 2 9 is formed at the connection between the secondary airflow channel 6 and the adjustment hole 2, and an air inlet 10 is formed at the connection between the air inlet channel 7 and the adjustment hole 2. The projections of the air outlet 1 8 and the air outlet 2 9 in the axial direction of the adjustment hole 2 do not have an overlapping section, and the projections of the two in the axial direction of the adjustment hole 2 are staggered. At the same time, the projections of the air inlet 10 and the air outlet 2 9 in the axial direction of the adjustment hole 2 do not have an overlapping section, and the projections of the two in the axial direction of the adjustment hole 2 are staggered. A rotatable regulating valve stem 11 is installed in the adjustment hole 2, and the cross-sections of the regulating valve stem 11 are circular at various locations. An air guide groove 12 is provided on the regulating valve stem 11 between the air inlet 10 and the air outlet 1 8, and the air guide groove 12 can be annular, arc-shaped or fan-shaped. The air guide groove 12 connects the air inlet 10 and the air outlet 18, so that the air outlet 18 can always be connected with the air inlet 10. In addition, the air guide groove 12 can also be opened on the adjustment hole 2, and can also be annular, arc-shaped, or fan-shaped.

[0041] like Figure 5 and Figure 6 As shown, a control hole 13 is also provided on the outer surface of the front end of the regulating valve stem 11, and the control hole 13 is arranged radially along the regulating valve stem 11, so as to facilitate the processing of the control hole 13. An air guide channel 14 connecting the control hole 13 and the air guide groove 12 is also provided in the regulating valve stem 11. The air guide channel 14 includes an axial channel 15 arranged along the axis of the regulating valve stem 11 and a radial channel 16 perpendicular to the axis of the regulating valve stem 11. There are multiple radial channels 16 and they are evenly distributed along the circumferential direction of the side of the regulating valve stem 11. The axial channel 15 is located in the center of the regulating valve stem 11, one end of which is connected to the control hole 13 and the other end of which is connected to the radial channel 16. In addition, the air guide channel 14 can also be an inclined hole, which is inclined to connect the air guide groove 12 and the inner end of the control hole 13. Although the inclined hole is more difficult to process, only one hole needs to be drilled, which can reduce the processing steps.

[0042] When the regulating valve stem 11 rotates, the overlap between the control hole 13 and the gas outlet 9 gradually changes, so that the compressed gas entering the secondary air flow channel 6 gradually increases or decreases, thereby achieving the effect of adjusting the spray amplitude of the spray gun.

[0043] Both ends of the regulating valve stem 11 are provided with sealing grooves 17, and sealing rings 18 are installed on the sealing grooves 17. The air inlet 10, the air outlet 1 8 and the air outlet 2 9 are all located between the two sealing rings 18. The regulating hole 2 is a through hole, so that the processing of the regulating hole 2 is convenient. During processing, the drill bit can directly drill through both sides of the gun body 1, so as to facilitate the processing of the regulating hole 2. The drill bit directly drills through the regulating hole 2, which can make the inner wall of the regulating hole 2 smoother and have better processing accuracy. A limiting groove 22 is provided at one end of the regulating hole 2, and a flange 19 that cooperates with the limiting groove 22 is provided at one end of the regulating valve stem 11. After installation, the flange 19 is located in the limiting groove 22 to prevent the regulating valve stem 11 from slipping out to one side of the regulating hole 2. A notch 23 is also provided on the edge of the flange 19, and a convex tooth 20 is provided on the hand of the limiting groove 22, and the convex tooth 20 is inserted into the notch 23, so as to limit the rotation angle of the regulating valve stem 11.

[0044] The other side of the regulating valve stem 11 provided with the flange 19 is also provided with a knob 21, and the knob 21 is fixed to the end surface of one end of the regulating valve stem 11 by a screw 24. The end of the knob 21 facing the gun body 1 contacts the gun body 1, thereby fixing the regulating valve stem 11 in the regulating hole 2. When the knob 21 is turned, the regulating valve stem 11 also rotates together, thereby realizing the adjustment of the spraying amplitude of the spray gun.

[0045] The above description is merely an exemplary embodiment of the present invention and is not intended to limit the protection scope of the present invention. The protection scope of the present invention is determined by the appended claims.

Claims

1. A spray width rapid adjustment device for a spray gun, comprising a gun body (1), the gun body (1) being provided with an adjustment hole (2), a main air flow channel (3), a secondary air flow channel (6) and an air inlet channel (7), the air inlet channel (7), the main air flow channel (3) and the secondary air flow channel (6) being all connected to the adjustment hole (2), a first air outlet (8) being formed at the connection point between the main air flow channel (3) and the adjustment hole (2), a second air outlet (9) being formed at the connection point between the secondary air flow channel (6) and the adjustment hole (2), an air inlet (10) being formed at the connection point between the air inlet channel (7) and the adjustment hole (2), the projections of the first air outlet (8) and the second air outlet (9) in the axial direction of the adjustment hole (2) being staggered, the projections of the air inlet (10) and the second air outlet (9) in the axial direction of the adjustment hole (2) being staggered, a rotatable adjustment valve stem (11) being installed in the adjustment hole (2), wherein: An air guide groove (12) is provided on the regulating valve stem (11) or the regulating hole (2) between the air inlet (10) and the air outlet (8), and the air guide groove (12) is always connected to the air inlet (10) and the air outlet (8). A control hole (13) is also provided on the outer surface of the regulating valve stem (11), and an air guide channel (14) connecting the control hole (13) and the air guide groove (12) is provided in the regulating valve stem (11). When the regulating valve stem (11) rotates, the control hole (13) and the air outlet (9) can gradually change from a non-overlapping state to a completely overlapping state. The air guide channel (14) includes an axial flow channel (15) provided along the axis direction of the regulating valve stem (11) and a radial flow channel (16) perpendicular to the axis of the regulating valve stem (11), and the regulating hole (2) is a through hole.

2. The spray width quick adjustment device of a spray gun according to claim 1, characterized in that: The control hole (13) is arranged along the radial direction of the regulating valve stem (11).

3. The spray width quick adjustment device of a spray gun according to claim 1, characterized in that: The air guide groove (12) is arranged on the regulating valve stem (11).

4. The spray width quick adjustment device of a spray gun according to claim 1, characterized in that: Sealing grooves (17) are arranged at both ends of the regulating valve stem (11), and sealing rings (18) are installed in the sealing grooves (17).

5. The spray width quick adjustment device of a spray gun according to claim 4, characterized in that: One end of the regulating valve stem (11) is provided with a flange (19), one end of the regulating hole (2) is provided with a limiting groove (22), and the flange (19) is located in the limiting groove (22).

6. The spray width quick adjustment device of a spray gun according to claim 5, characterized in that: A notch (23) is provided on the flange (19), and a convex tooth (20) is provided on the limiting groove (22). The convex tooth (20) is inserted into the notch (23) to limit the rotation angle of the regulating valve stem (11).

7. The spray width quick adjustment device of a spray gun according to claim 5, characterized in that: A knob (21) is installed at the other end of the regulating valve stem (11), and the end of the knob (21) contacts the gun body (1).

Images