A paint equal spraying device

Abstract

The present invention relates to a coating equalizing spraying device, which includes a hydraulic reversing valve, a material suction device, a coating cylinder, a hydraulic cylinder and an accumulator. The piston of the hydraulic reversing valve is connected to the piston of the material suction device; the upper chamber of the cylinder body of the coating cylinder is rigidly connected or connected through an oil circuit to the lower chamber of the cylinder body of the hydraulic cylinder; the lower chamber of the cylinder body of the coating cylinder is provided with a feed port and a discharge port. The feed port of the coating cylinder is communicated with the discharge port of the material suction device, and the discharge port of the coating cylinder is externally connected to a spray gun through a pipeline. The upper chamber of the cylinder body of the hydraulic cylinder is communicated with the accumulator. In the present invention, when the piston of the material suction device moves downward, under the action of pressure, the piston of the coating cylinder is pushed upward. When the coating is extruded from the coating cylinder, the amount of coating flowing to the spray gun becomes appropriately less; when the piston of the material suction device moves upward, the supply amount of the coating during material suction increases. When the material suction device makes a reciprocating motion, the coating cylinder drives the hydraulic cylinder to also make a reciprocating motion passively, and finally the effect of equalizing the sprayed coating is achieved.

Description

Technical Field

[0001] The present invention relates to the field of paint spraying, and particularly to a paint balanced spraying device. Background Art

[0002] As shown in the traditional paint spraying device Figure 1 Under the action of hydraulic oil, it drives a hydraulic reversing valve, causing the piston and the first piston rod of the hydraulic reversing valve to move up and down reciprocally. The reciprocating first piston rod then drives the piston of the suction device to move up and down reciprocally. When the piston of the suction device moves upward, the suction device sucks up the paint from the container filled with paint through the suction port; when the piston of the suction device moves downward, the suction port of the suction device closes, and the paint is squeezed from the discharge port of the suction device into the pipeline connecting the spray gun and is transported to the spray gun for spraying.

[0003] From the working principle introduced above, the paint external spraying and extrusion process of the traditional paint spraying device is intermittent, that is, there is no paint external spraying when the piston of the suction device moves upward, and there is paint external spraying when the piston of the suction device moves downward; however, due to the relatively high reciprocating frequency of the hydraulic reversing valve, traditionally, the spray gun is also manually moved by hand, and the non-uniformity caused by the intermittent extrusion of paint is not particularly obvious. However, when using numerical control walking spraying, due to the quite consistent walking speed, the phenomenon of uneven thickness caused by the intermittent extrusion of paint is quite obvious. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a paint balanced spraying device to solve the problem of uneven thickness caused by the intermittent extrusion of paint during numerical control walking spraying.

[0005] The technical solution of the present invention to solve the above technical problem is as follows: A paint balanced spraying device includes a hydraulic reversing valve and a suction device, and the piston of the hydraulic reversing valve is connected to the piston of the suction device through a first piston rod; it also includes a paint cylinder, a hydraulic cylinder, and an accumulator. The paint cylinder and the hydraulic cylinder both include a cylinder body sealed at both upper and lower ends and a piston arranged in the cylinder body. The piston of the paint cylinder divides the cylinder body of the paint cylinder into upper and lower two chambers, and the piston of the hydraulic cylinder divides the cylinder body of the hydraulic cylinder into upper and lower two chambers; the upper chamber of the cylinder body of the paint cylinder is rigidly connected or connected through an oil circuit to the lower chamber of the cylinder body of the hydraulic cylinder; the lower chamber of the cylinder body of the paint cylinder is provided with a feed port and a discharge port. The feed port of the paint cylinder is communicated with the discharge port of the suction device, and the discharge port of the paint cylinder is externally connected to a spray gun through a pipeline. The upper chamber of the cylinder body of the hydraulic cylinder is communicated with the accumulator, and hydraulic oil is filled between the upper chamber of the cylinder body of the hydraulic cylinder and the accumulator.

[0006] Based on the above technical solution, the present invention can also be improved as follows.

[0007] Further, when the upper chamber of the cylinder body of the paint cylinder is rigidly connected to the lower chamber of the cylinder body of the hydraulic cylinder, the piston of the paint cylinder and the piston of the hydraulic cylinder are connected by a second piston rod, and the second piston rod penetrates between the upper chamber of the cylinder body of the paint cylinder and the lower chamber of the cylinder body of the hydraulic cylinder; the upper end of the cylinder body of the paint cylinder and the lower end of the cylinder body of the hydraulic cylinder are rigidly connected by a connecting rod.

[0008] Further, there are a plurality of the connecting rods, and the plurality of connecting rods are evenly distributed and rigidly connected between the upper end of the cylinder body of the paint cylinder and the lower end of the cylinder body of the hydraulic cylinder.

[0009] Further, when the upper chamber of the cylinder body of the paint cylinder is connected to the lower chamber of the cylinder body of the hydraulic cylinder through an oil circuit, the upper chamber of the cylinder body of the paint cylinder and the lower chamber of the cylinder body of the hydraulic cylinder are communicated through a hydraulic oil pipeline, and hydraulic oil is filled between the upper chamber of the cylinder body of the paint cylinder and the lower chamber of the cylinder body of the hydraulic cylinder.

[0010] Further, the accumulator is filled with a pre-pressure.

[0011] Further, the discharge port of the paint cylinder is located above the feed port of the paint cylinder, and a one-way valve is provided in the cylinder body of the paint cylinder and between the discharge port and the feed port of the paint cylinder.

[0012] Further, the inner diameter of the cylinder body of the paint cylinder is the same as or different from the inner diameter of the cylinder body of the hydraulic cylinder.

[0013] The beneficial effects of the present invention are as follows: In a paint equalizing spraying device of the present invention, in the non-working state, under the action of the pre-pressure of the accumulator, the piston of the hydraulic cylinder is pushed to the lowermost end; in the working state, when the piston of the suction device moves downward, the paint in the suction device is pressed into the paint cylinder, and pressure begins to exist in the pipeline. Under the action of the pressure, the piston of the paint cylinder is pushed upward, driving the piston of the hydraulic cylinder to move upward, increasing the pressure in the upper chamber of the hydraulic cylinder, and the accumulator stores energy; when the paint is extruded from the paint cylinder, the pressure in the pipeline increases, and part of the paint in the pipeline is squeezed into the paint cylinder, so that the paint flowing to the spray gun is appropriately less than the paint extruded when the piston of the suction device moves downward in the traditional paint spraying device; when the piston of the suction device moves upward, the suction device starts to suck paint. At this time, the paint pressure in the pipeline becomes smaller, and the paint squeezed into the paint cylinder begins to supplement the paint in the pipeline, so that the supply amount of paint during suction is increased compared with the supply amount of paint when the piston of the suction device moves upward to suck paint in the traditional paint spraying device. When the suction device makes a reciprocating motion, the paint cylinder drives the hydraulic cylinder to also make a reciprocating motion passively, and finally the effect of equalizing the sprayed paint is achieved. Description of the Drawings

[0014] Figure 1It is a structural schematic diagram of a traditional paint spraying device;

[0015] Figure 2 It is a structural schematic diagram of a paint equalizing spraying device of the present invention;

[0016] Figure 3 It is another structural schematic diagram of a paint equalizing spraying device of the present invention.

[0017] In the attached drawings, the list of components represented by each reference numeral is as follows:

[0018] 1. Hydraulic reversing valve, 2. Suction device, 3. Paint cylinder, 4. Hydraulic cylinder, 5. Accumulator, 6. Pipeline, 7. First piston, 8. Second piston, 9. Connecting rod, 10. Hydraulic oil pipeline, 11. Check valve, 12. Container. Specific embodiments

[0019] The principles and features of the present invention will be described below in conjunction with the attached drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0020] The traditional paint spraying device is as Figure 1 shown. Driven by hydraulic oil, it drives the hydraulic reversing valve 1, causing the piston of the hydraulic reversing valve 1 and the first piston 7 to move up and down reciprocally. The reciprocating first piston 7 then drives the piston of the suction device 2 to move up and down reciprocally. When the piston of the suction device 2 moves upward, the suction device 2 sucks up the paint from the container 12 filled with paint through the suction port; when the piston of the suction device 2 moves downward, the suction port of the suction device 2 closes, and the paint is squeezed from the discharge port of the suction device 2 into the pipeline 6 connected to the spray gun and is transported to the spray gun for spraying. Among them, the inlet and outlet arrows on the hydraulic reversing valve 1 represent the inlet and outlet passages of the hydraulic oil.

[0021] To solve the problem of uneven thickness in numerical control walking spraying, the present invention adds a set of equalizing equipment composed of a paint cylinder, a hydraulic cylinder, and an accumulator to the traditional spraying device to form a paint equalizing spraying device of the present invention.

[0022] As Figure 2 and Figure 3As shown in the figure, a paint equalizing spraying device of the present invention includes a hydraulic reversing valve 1 and a material suction device 2. The piston of the hydraulic reversing valve 1 is connected to the piston of the material suction device 2 through a first piston rod 7. It also includes a paint cylinder 3, a hydraulic cylinder 4 and an accumulator 5. Both the paint cylinder 3 and the hydraulic cylinder 4 include a cylinder body sealed at both upper and lower ends and a piston arranged inside the cylinder body. The piston of the paint cylinder 3 divides the cylinder body of the paint cylinder 3 into upper and lower chambers, and the piston of the hydraulic cylinder 4 divides the cylinder body of the hydraulic cylinder 4 into upper and lower chambers. The upper chamber of the cylinder body of the paint cylinder 3 is rigidly connected or connected through an oil circuit to the lower chamber of the cylinder body of the hydraulic cylinder 4. The lower chamber of the cylinder body of the paint cylinder 3 is provided with a feed port and a discharge port. The feed port of the paint cylinder 3 is communicated with the discharge port of the material suction device 2, and the discharge port of the paint cylinder 3 is externally connected to a spray gun through a pipeline 6. The upper chamber of the cylinder body of the hydraulic cylinder 4 is communicated with the accumulator 5, and hydraulic oil is filled between the upper chamber of the cylinder body of the hydraulic cylinder 4 and the accumulator 5.

[0023] In this specific embodiment: As Figure 2 shown, when the upper chamber of the cylinder body of the paint cylinder 3 is rigidly connected to the lower chamber of the cylinder body of the hydraulic cylinder 4, the piston of the paint cylinder 3 is connected to the piston of the hydraulic cylinder 4 through a second piston rod 8, and the second piston rod 8 penetrates between the upper chamber of the cylinder body of the paint cylinder 3 and the lower chamber of the cylinder body of the hydraulic cylinder 4. The upper end of the cylinder body of the paint cylinder 3 is rigidly connected to the lower end of the cylinder body of the hydraulic cylinder 4 through a connecting rod 9. Specifically, a plurality of the connecting rods 9 are provided, and the plurality of connecting rods 9 are evenly distributed and rigidly connected between the upper end of the cylinder body of the paint cylinder 3 and the lower end of the cylinder body of the hydraulic cylinder 4.

[0024] In other embodiments: As Figure 3 shown, when the upper chamber of the cylinder body of the paint cylinder 3 is connected to the lower chamber of the cylinder body of the hydraulic cylinder 4 through an oil circuit, the upper chamber of the cylinder body of the paint cylinder 3 is communicated with the lower chamber of the cylinder body of the hydraulic cylinder 4 through a hydraulic oil pipeline 10, and hydraulic oil is filled between the upper chamber of the cylinder body of the paint cylinder 3 and the lower chamber of the cylinder body of the hydraulic cylinder 4.

[0025] In this specific embodiment: The accumulator 5 is filled with a pre-pressure.

[0026] In this specific embodiment: The discharge port of the paint cylinder 3 is located above the feed port of the paint cylinder 3, and a one-way valve 11 is provided inside the cylinder body of the paint cylinder 3 and between the discharge port and the feed port of the paint cylinder 3.

[0027] In this specific embodiment: The inner diameter of the cylinder body of the paint cylinder 3 is the same as or different from the inner diameter of the cylinder body of the hydraulic cylinder 4. When the inner diameter of the cylinder body of the paint cylinder 3 is different from the inner diameter of the cylinder body of the hydraulic cylinder 4, the pressure of the cylinder body of the paint cylinder 3 and the cylinder body of the hydraulic cylinder 4 can be adjusted. For example, if the inner diameter of the cylinder body of the paint cylinder 3 is 50 and the inner diameter of the cylinder body of the hydraulic cylinder 4 is 80, and if the pressure inside the cylinder body of the paint cylinder 3 is 50 MPa, then the pressure inside the cylinder body of the hydraulic cylinder 4 is only 19.5 MPa.

[0028] The following takes the rigid connection between the upper chamber of the cylinder body of the paint cylinder 3 and the lower chamber of the cylinder body of the hydraulic cylinder 4 as an example to illustrate the working principle of the present invention:

[0029] In the non-working state of the paint equalizing spraying device of the present invention, the space between the hydraulic cylinder 4 and the accumulator 5 is filled with hydraulic oil. Under the pre-pressure of the accumulator 5, the piston of the hydraulic cylinder 4 is pushed to the lowermost end. In the working state, when the piston of the material suction device 2 moves downward, the paint in the material suction device 2 is pressed into the paint cylinder 3, and pressure begins to exist in the pipeline 6. Under the action of the pressure, the piston of the paint cylinder 3 is pushed upward, driving the piston of the hydraulic cylinder 4 to move upward through the second piston 8, so that the pressure in the upper chamber of the hydraulic cylinder 4 gradually increases, and the accumulator 5 stores energy. At the same time, the pressure in the lower chamber of the cylinder body of the paint cylinder 3 gradually decreases. When the paint is extruded from the paint cylinder 3, the pressure in the pipeline 6 increases, and part of the paint in the pipeline 6 is squeezed back into the paint cylinder 3, making the paint flowing to the spray gun slightly less than the paint extruded when the piston of the material suction device 2 moves downward in the traditional paint spraying device; when the piston of the material suction device 2 moves upward, the material suction device 2 starts to suck materials. At this time, the paint pressure in the pipeline 6 becomes smaller, and at the same time, the accumulator 5 releases energy to drive the piston of the hydraulic cylinder 4 to drive the piston of the paint cylinder 3 to move downward through the second piston 8. The pressure in the lower chamber of the cylinder body of the paint cylinder 3 gradually increases, and the paint squeezed into the paint cylinder 3 starts to supplement the paint in the pipeline 6, making the supply amount of the paint in the pipeline 6 when the material suction device 2 sucks materials increase compared with the supply amount of the paint in the pipeline 6 when the piston of the material suction device 2 moves upward to suck materials in the traditional paint spraying device. When the material suction device 2 makes a reciprocating motion, with the assistance of the accumulator 5, the paint cylinder 3 drives the hydraulic cylinder 4 to also make a reciprocating motion passively, and finally the effect of uniform paint spraying is achieved.

[0030] In addition: In the present invention, in order to ensure that the paint in the pipeline 6 is not sucked back simultaneously when the material suction device 2 moves upward, a one-way valve 11 is installed in the paint cylinder 3, and the flow direction of the one-way valve 11 is from the feed port of the paint cylinder 3 to the discharge port of the paint cylinder 3; at the same time, the one-way valve 11 can also ensure that all the paint supplemented into the pipeline 6 enters the spray gun. The function of the one-way valve 11 is to prevent backflow.

[0031] The present invention is to reduce the supply amount of the paint in the pipeline when the piston of the suction device moves downward for discharging in the traditional paint spraying device, and increase the supply amount of the paint in the pipeline when the piston of the suction device moves upward for suction in the traditional paint spraying device, so that the increased supply amount of the paint in the pipeline is balanced with the reduced supply amount, thereby enabling the supply amount of the paint in the pipeline to be the same during the intermittent extrusion of the paint when the suction device sucks and discharges the paint, and further ensuring uniform thickness during numerical control walking spraying.

[0032] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A paint balanced spraying device, comprising a hydraulic reversing valve (1) and a material suction device (2), wherein a piston of the hydraulic reversing valve (1) is connected to a piston of the material suction device (2) through a first piston rod (7); characterized in that: It further includes a coating cylinder (3), a hydraulic cylinder (4) and an accumulator (5). Both the coating cylinder (3) and the hydraulic cylinder (4) include a cylinder body sealed at both upper and lower ends and a piston disposed within the cylinder body. The piston of the coating cylinder (3) divides the cylinder body of the coating cylinder (3) into upper and lower chambers, and the piston of the hydraulic cylinder (4) divides the cylinder body of the hydraulic cylinder (4) into upper and lower chambers; the upper chamber of the cylinder body of the coating cylinder (3) is rigidly connected or connected through an oil circuit to the lower chamber of the cylinder body of the hydraulic cylinder (4); the lower chamber of the cylinder body of the coating cylinder (3) is provided with a feed port and a discharge port. The feed port of the coating cylinder (3) is communicated with the discharge port of the suction device (2), and the discharge port of the coating cylinder (3) is externally connected to a spray gun through a pipeline (6). The upper chamber of the cylinder body of the hydraulic cylinder (4) is communicated with the accumulator (5), and hydraulic oil is filled between the upper chamber of the cylinder body of the hydraulic cylinder (4) and the accumulator (5); The accumulator (5) is filled with a pre-pressure; The discharge port of the coating cylinder (3) is located above the feed port of the coating cylinder (3), and a check valve (11) is provided within the cylinder body of the coating cylinder (3) and between the discharge port and the feed port of the coating cylinder (3).

2. The paint equalizing spraying device according to claim 1, characterized in that: When the upper chamber of the cylinder body of the coating cylinder (3) is rigidly connected to the lower chamber of the cylinder body of the hydraulic cylinder (4), the piston of the coating cylinder (3) is connected to the piston of the hydraulic cylinder (4) through a second piston rod (8), and the second piston rod (8) penetrates between the upper chamber of the cylinder body of the coating cylinder (3) and the lower chamber of the cylinder body of the hydraulic cylinder (4); the upper end of the cylinder body of the coating cylinder (3) is rigidly connected to the lower end of the cylinder body of the hydraulic cylinder (4) through a connecting rod (9).

3. The paint equal spraying device according to claim 2, characterized in that: There are multiple connecting rods (9), and the multiple connecting rods (9) are evenly distributed and rigidly connected between the upper end of the cylinder body of the coating cylinder (3) and the lower end of the cylinder body of the hydraulic cylinder (4).

4. The paint equalizing spraying device according to claim 1, wherein: When the upper chamber of the cylinder body of the coating cylinder (3) is connected to the lower chamber of the cylinder body of the hydraulic cylinder (4) through an oil circuit, the upper chamber of the cylinder body of the coating cylinder (3) is communicated with the lower chamber of the cylinder body of the hydraulic cylinder (4) through a hydraulic oil pipeline (10), and hydraulic oil is filled between the upper chamber of the cylinder body of the coating cylinder (3) and the lower chamber of the cylinder body of the hydraulic cylinder (4).

5. The paint equalizing spraying device according to any one of claims 1 to 4, characterized in that: The inner diameter of the cylinder body of the coating cylinder (3) is the same as or different from the inner diameter of the cylinder body of the hydraulic cylinder (4).

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