Powder conveying assembly

Abstract

The utility model belongs to the technical field of powder coating spraying devices, and particularly relates to a powder conveying assembly. Comprising a plurality of powder conveying units, each powder conveying unit comprises a first valve allowing powder to enter and a second valve allowing powder to flow out, each powder conveying unit further comprises a containing cavity used for containing sucked powder, and the first valves and the second valves are both communicated with the containing cavities. The first valves of all the powder conveying units are communicated, the second valves of all the powder conveying units are communicated, when the powder conveying assembly works, the first valve and the second valve of each powder conveying unit are alternately opened and closed, and when the first valves of part of the powder conveying units are opened and the second valves of part of the powder conveying units are closed, the powder conveying assembly works. And the first valves of the rest powder conveying units are closed while the second valves are opened. The powder conveying device can be matched with pulse airflow, powder is stably and accurately conveyed to a spray gun from a powder box, and continuous conveying is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of powder coating spraying devices, and in particular relates to a powder conveying component. Background Art

[0002] During the powder coating spraying process, the powder pump needs to extract the powder inside the powder box and transport it to the powder supply center, and then the powder pump connected to the powder supply center supplies powder to the spray gun for spraying. The prior art already has a technology for powder pumping through pulsed airflow, which can achieve precise control of powder delivery, but the disadvantage is that it is difficult to achieve continuous delivery. This is because the pulsed airflow will cause the powder to move in a pulsed manner in the pipeline, and it is impossible to form a continuous and stable delivery flow. Therefore, it is usually not used in situations where continuous powder delivery is required, and cannot be applied in situations where stable and continuous spraying is required. Utility Model Content

[0003] In order to solve the above technical problems, it is necessary to provide a powder conveying component that can be used in conjunction with a pulsed airflow to achieve continuous powder conveying.

[0004] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0005] A powder delivery assembly includes a plurality of powder delivery units, wherein the powder delivery units include a first valve for powder to enter and a second valve for powder to flow out, and the powder delivery units also include a accommodating chamber for accommodating inhaled powder, the first valve and the second valve are both connected to the accommodating chamber, the first valves of all powder delivery units are connected, and the second valves of all powder delivery units are connected. When the powder delivery assembly is working, the first valve and the second valve of each powder delivery unit are switched alternately, and when the first valves of some powder delivery units are opened and the second valves are closed, the first valves of the remaining powder delivery units are closed and the second valves are opened.

[0006] The powder conveying assembly provided by the utility model includes a plurality of powder conveying units, and the powder conveying units can be roughly divided into a powder suction stage and a powder delivery stage when working. In the powder suction stage, the first valve is opened and the second valve is closed, and air is sucked from the powder box into the accommodating chamber; in the powder delivery stage, the second valve is opened and the first valve is closed, and air is blown into the accommodating chamber to blow the powder in the accommodating chamber out of the second valve to achieve pulse pumping. The plurality of powder conveying units are connected at the air inlet and the air outlet, respectively, to achieve parallel connection. When in use, a part of the powder conveying units suck powder, and another part of the powder conveying units deliver powder, and a plurality of parallel powder conveying units work alternately, thereby continuously outputting powder. When installed, the input end of the powder conveying unit is connected to the powder box, and the output end is connected to the spray gun. The utility model can cooperate with the pulse airflow to stably and accurately deliver the powder from the powder box to the spray gun, and achieve continuous delivery.

[0007] Preferably, the powder delivery unit comprises a shell, the first valve and the second valve are both located on the shell, the accommodating chamber is located inside the shell, and the accommodating chamber is a fluidizing tube, and a hole for allowing gas to pass through and preventing powder from passing through is provided on the tube body of the fluidizing tube. The powder is aggregated through the fluidizing tube.

[0008] Preferably, a pneumatic gap is left between the fluidizing tube and the shell, and the powder conveying unit further comprises a positive and negative pressure switching interface connected to the pneumatic gap. The pulse airflow is connected through the positive and negative pressure switching interface to realize pulse pumping, which is convenient for connection and setting.

[0009] Preferably, the powder delivery assembly further includes a first conduit and a second conduit, wherein the first conduit connects the first valves of all powder delivery units, and the second conduit connects the second valves of all powder delivery units. The conduit is used to realize parallel connection between powder delivery assemblies, and the powder delivery units can be arbitrarily combined by changing the conduit to meet the needs of more scenarios.

[0010] Preferably, the powder delivery unit further includes a first auxiliary interface disposed between the first valve and the positive and negative pressure switching interface, the first auxiliary interface being connected to the pneumatic gap; and / or further includes a second auxiliary interface disposed between the second valve and the positive and negative pressure switching interface, the second auxiliary interface being connected to the pneumatic gap. Since the fluidizing tube may be relatively long, if only one positive and negative pressure switching interface is provided, the efficiency of powder suction and powder delivery may not be ideal. By providing a first auxiliary interface near the first valve and / or providing a second auxiliary interface near the second valve, air can be supplied or extracted to the auxiliary interface, thereby improving the pumping efficiency. In addition, the first auxiliary interface and the second auxiliary interface are generally disposed relatively close to the valve so as to cover the body of the fluidizing tube.

[0011] Preferably, the distance between the positive and negative pressure switching interface and the first valve is smaller than the distance between the positive and negative pressure switching interface and the second valve. As long as the fluidizing tube is under negative pressure, the powder suction effect will not be much different, but the blowing angle needs to be considered when blowing the powder, so it is better to set the positive and negative pressure switching interface closer to the first valve.

[0012] Preferably, the first valve includes a valve housing, and a soft pipe arranged inside the valve housing, the soft pipe is connected to the fluidizing tube; the powder conveying unit also includes a pneumatic interface for introducing compressed air to deform the soft pipe, the valve housing is provided with two oppositely arranged air vents, the pneumatic interface is connected to the two air vents, and when air is ventilated into the pneumatic interface, the airflow enters the valve housing from the air vents to squeeze the soft pipe, so that the inner walls of the soft pipe are close to each other and reach a closed state when they are tightly attached; and / or the structure of the second valve is the same as that of the first valve. In this structure, the opening and closing of the first valve and / or the second valve can be controlled by introducing airflow, and the method of squeezing the soft pipe to close it has a better sealing effect on the powder and can avoid powder leakage.

[0013] Preferably, the shell includes a delivery pipe, a first valve body shell and a second valve body shell respectively sleeved at both ends of the delivery pipe, a first quick-connect joint plugged into the first valve body shell and a second quick-connect joint plugged into the second valve body shell, and also includes a first pressing cover for pressing the first quick-connect joint onto the first valve body shell and a second pressing cover for pressing the second quick-connect joint onto the second valve body shell. In this structure, the shell can be quickly assembled and disassembled, which is convenient for disassembly and assembly; the use of a quick-connect joint as a component at the end of the shell facilitates the quick assembly and disassembly of the powder delivery unit, the powder box, and the spray gun.

[0014] Preferably, the fluidizing tube includes a first inner fluidizing tube, a main fluidizing tube and a second inner fluidizing tube, the first inner fluidizing tube is docked with the first valve, the second inner fluidizing tube is docked with the second valve, and the two ends of the main fluidizing tube are docked with the first inner fluidizing tube and the second inner fluidizing tube respectively; the inner diameter of the first inner fluidizing tube gradually expands from the first valve to the main fluidizing tube, and the inner diameter of the second inner fluidizing tube gradually shrinks from the main fluidizing tube to the second valve. In this structure, the fluidizing tube is divided into three sections for easy installation and docking; the fluidization effect is improved by shrinking and expanding the first inner fluidizing tube and the second inner fluidizing tube.

[0015] Preferably, a positioning groove for the valve housing to be clamped is provided on the outer wall of the soft pipe, and the valve housing is clamped in the positioning groove and arranged around the soft pipe.

[0016] Preferably, a positioning step is provided inside the first valve body shell, and the first valve body shell is divided into a first cavity for fixing the first valve and a second cavity for docking the fluidizing tube with the positioning step as the boundary, and a through hole connecting the first cavity and the second cavity is provided on the positioning step; and / or the second valve body shell has the same structure as the first valve body shell.

[0017] Preferably, the positive and negative pressure switching interface is arranged on the first valve body shell. When blowing powder, the blowing angle needs to be considered, so the effect of arranging the positive and negative pressure switching interface closer to the first valve is better.

[0018] Preferably, the first auxiliary interface is arranged on the first valve body housing.

[0019] Preferably, the first quick-connect joint is provided with a sealing ring and a groove for the sealing ring to be clamped, the first quick-connect joint is sealed by the sealing ring when plugged into the first valve body shell, and / or the structure of the second quick-connect joint is the same as that of the first quick-connect joint. In this structure, the sealing ring is used to increase the air tightness between the first quick-connect joint and the first valve body shell, and the sealing ring is fixed by clamping, so that it is easy to replace the sealing ring when it is aged. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and other purposes, features and advantages of the present invention will become more apparent through a more specific description of the preferred embodiments of the present invention shown in the accompanying drawings. The same reference numerals in all the accompanying drawings indicate the same parts, and the drawings are not intentionally scaled to the actual size, but the focus is on illustrating the subject matter of the present invention.

[0021] Figure 1 It is a schematic diagram of the overall structure of a preferred embodiment of a powder delivery assembly;

[0022] Figure 2 An exploded view of a shell in a preferred embodiment of a powder delivery unit;

[0023] Figure 3 A cross-sectional view of a preferred embodiment of a powder delivery unit.

[0024] In the figure: a first valve 1, a valve housing 11, a soft pipe 12, a second valve 2, a fluidizing tube 3, a first inner fluidizing tube 31, a main fluidizing tube 32, a second inner fluidizing tube 33, a positive and negative pressure switching interface 4, a first auxiliary interface 5, a second auxiliary interface 6, a pneumatic interface 7, a shell 8, a delivery pipe 80, a first valve body shell 81, a positioning step 811, a second valve body shell 82, a first quick-connect connector 83, a second quick-connect connector 84, a first clamping cover 85, a second clamping cover 86, a first manifold 91, and a second manifold 92. DETAILED DESCRIPTION

[0025] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings.

[0026] It should be noted that when an element is considered to be "connected" to another element, it may be directly connected to the other element and combined with it as a whole, or there may be an intermediate element at the same time. The terms "installed", "one end", "the other end" and similar expressions used in this article are only for the purpose of illustrating the present utility model.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art. The terms used in the specification herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0028] refer to Figure 1-Figure 3 A powder delivery assembly includes a plurality of powder delivery units, wherein the powder delivery unit includes a first valve 1 for powder to enter and a second valve 2 for powder to flow out, and the powder delivery unit also includes a receiving chamber for receiving the inhaled powder, wherein the first valve 1 and the second valve 2 are both connected to the receiving chamber, the first valves 1 of all powder delivery units are connected, and the second valves 2 of all powder delivery units are connected, and when the powder delivery assembly is working, the first valve 1 and the second valve 2 of each powder delivery unit are switched alternately, and when the first valve 1 of some powder delivery units is opened and the second valve 2 is closed, the first valve 1 of the remaining powder delivery units is closed and the second valve 2 is opened. In the preferred embodiment, the first valve 1 and the second valve 2 are both pneumatic valves, and in other embodiments, they can also be any other type of valves as long as they can achieve a sealing effect.

[0029] refer to Figure 2 and Figure 3 The powder delivery unit includes a housing 8, the first valve 1 and the second valve 2 are both located on the housing 8, the accommodating chamber is located inside the housing 8, and the accommodating chamber is a fluidizing tube 3, and a hole for allowing gas to pass through and preventing powder from passing through is provided on the tube body of the fluidizing tube 3. The size of the hole for allowing gas to pass through and preventing powder from passing through is determined according to the particle size of the powder used.

[0030] refer to Figure 3 In a preferred embodiment, a pneumatic gap is left between the fluidizing tube 3 and the shell 8, and the powder conveying unit further includes a positive and negative pressure switching interface 4 connected to the pneumatic gap.

[0031] refer to Figure 1In a preferred embodiment, the powder delivery assembly further includes a first manifold 91 and a second manifold 92. The first manifold 91 connects the first valves 1 of all powder delivery units, and the second manifold 92 connects the second valves 2 of all powder delivery units. The first manifold 91 and the second manifold 92 in the preferred embodiment include a three-way pipe, which may be different in other embodiments according to the structure and combination requirements of the powder delivery unit.

[0032] refer to Figure 3 In a preferred embodiment, it further includes a first auxiliary interface 5 disposed between the first valve 1 and the positive and negative pressure switching interface 4, the first auxiliary interface 5 being connected to the pneumatic gap; and a second auxiliary interface 6 disposed between the second valve 2 and the positive and negative pressure switching interface 4, the second auxiliary interface 6 being connected to the pneumatic gap. Since the fluidizing tube 3 in the preferred embodiment is relatively long, if only one positive and negative pressure switching interface 4 is provided, the efficiency of powder suction and powder delivery may not be ideal. By providing the first auxiliary interface 5 near the first valve 1 and the second auxiliary interface 6 near the second valve 2, air can be supplied or extracted to the auxiliary interfaces, thereby improving the pumping efficiency.

[0033] refer to Figure 3 In a preferred embodiment, the distance between the positive and negative pressure switching interface 4 and the first valve 1 is smaller than the distance between the positive and negative pressure switching interface 4 and the second valve 2 .

[0034] refer to Figure 3 In a preferred embodiment, the first valve 1 includes a valve housing 11, and a soft pipe 12 arranged inside the valve housing 11, and the soft pipe 12 is connected to the fluidizing tube 3; the powder conveying unit also includes a pneumatic interface 7 for introducing compressed air to deform the soft pipe 12, and the valve housing 11 is provided with two oppositely arranged vents, and the pneumatic interface 7 is connected to the two vents. When air is ventilated into the pneumatic interface 7, the airflow enters the valve housing 11 from the vents to squeeze the soft pipe 12, so that the inner walls of the soft pipe 12 are close to each other and reach a closed state when they are close to each other; and / or the structure of the second valve 2 is the same as that of the first valve 1. The valve housing 11 in the preferred embodiment is composed of two identical halves of the shell body, and a buckle is arranged on the outer wall of the valve housing 11. The valve housing 11 is buckled into one body by the buckles symmetrically arranged at the two vents, so that the valve can be quickly installed and removed. In this structure, the opening and closing of the first valve 1 and / or the second valve 2 can be controlled by introducing air flow, and squeezing the soft pipe 12 to close it has a better sealing effect on the powder and can avoid powder leakage.

[0035] refer to Figure 2 and Figure 3In a preferred embodiment, the housing 8 includes a delivery pipe 80, a first valve body shell 81 and a second valve body shell 82 respectively sleeved at both ends of the delivery pipe 80, a first quick-connect joint 83 plugged into the first valve body shell 81 and a second quick-connect joint 84 plugged into the second valve body shell 82, and also includes a first pressing cover 85 for pressing the first quick-connect joint 83 onto the first valve body shell 81 and a second pressing cover 86 for pressing the second quick-connect joint 84 onto the second valve body shell 82. In this structure, the housing 8 can be quickly assembled and disassembled, which is convenient for disassembly and assembly; the use of quick-connect joints as components at the ends of the housing 8 facilitates the quick assembly and disassembly of the powder delivery unit, the powder box, and the spray gun.

[0036] refer to Figure 2 and Figure 3 In a preferred embodiment, the fluidizing tube 3 includes a first inner fluidizing tube 31, a main fluidizing tube 32 and a second inner fluidizing tube 33. The first inner fluidizing tube 31 is connected to the first valve 1, the second inner fluidizing tube 33 is connected to the second valve 2, and the two ends of the main fluidizing tube 32 are connected to the first inner fluidizing tube 31 and the second inner fluidizing tube 33 respectively; the inner diameter of the first inner fluidizing tube 31 gradually expands from the first valve 1 to the main fluidizing tube 32, and the inner diameter of the second inner fluidizing tube 33 gradually shrinks from the main fluidizing tube 32 to the second valve 2. In this structure, the fluidizing tube 3 is divided into three sections for easy installation and docking; the contraction and expansion of the first inner fluidizing tube 31 and the second inner fluidizing tube 33 improve the fluidization effect.

[0037] refer to Figure 3 In a preferred embodiment, a positioning step 811 is provided inside the first valve body shell 81. The first valve body shell 81 is divided into a first cavity for fixing the first valve 1 and a second cavity for docking the fluidizing tube 3 by the positioning step 811. The positioning step 811 is provided with a through hole connecting the first cavity and the second cavity; the second valve body shell 82 has the same structure as the first valve body shell 81. The positioning step 811 in the preferred embodiment is in the form of a sheet, and the through hole on the positioning step 811, the soft pipe 12 and the inner hole of the fluidizing tube 3 together form a smooth pipe.

[0038] refer to Figure 2 and Figure 3 In a preferred embodiment, a positioning groove for the valve housing 11 to be clamped is provided on the outer wall of the soft pipe 12, and the valve housing 11 is clamped in the positioning groove and arranged around the soft pipe 12.

[0039] refer to Figure 3In a preferred embodiment, the positive and negative pressure switching interface 4 is disposed on the first valve body housing 81. The blowing angle needs to be considered when blowing powder, so the effect is better when the positive and negative pressure switching interface 4 is disposed closer to the first valve 1.

[0040] refer to Figure 3 In a preferred embodiment, the first auxiliary interface 5 is arranged on the first valve body shell 81. The second auxiliary interface 6 is arranged on the second valve body shell 82. All blowing interfaces in the preferred embodiment are arranged on the valve body shell. When the capacity of the powder conveying device needs to be changed, it is only necessary to replace the mainstream liquid delivery pipe 32 and the delivery pipe 80, or the blowing interfaces can be increased or decreased as needed by changing the valve body shell, which is more convenient. In the preferred embodiment, the first valve body shell 81 and the second valve body shell 82 are exactly the same in structure, so a plug is provided at the position of the second valve body shell 82 corresponding to the positive and negative pressure switching interface 4 for sealing treatment, and other structures may also be used in other embodiments.

[0041] refer to Figure 2 In a preferred embodiment, a sealing ring and a groove for the sealing ring to be clamped are provided on the first quick-connect joint 83, and the first quick-connect joint 83 is sealed by the sealing ring when plugged into the first valve body shell 81, and / or the structure of the second quick-connect joint 84 is the same as that of the first quick-connect joint 83. In this structure, the sealing ring is used to increase the air tightness between the first quick-connect joint 83 and the first valve body shell 81, and the sealing ring is fixed by clamping, which is convenient for replacement when the sealing ring is aged. Similarly, all joints in the preferred embodiment are clamped with sealing rings to increase air tightness, which is convenient for replacement when the sealing ring is aged.

[0042] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0043] In the description of this specification, the description with reference to the terms "preferred embodiment", "further embodiment", "other embodiments" or "specific example" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0044] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A powder delivery assembly, characterized in that: The invention comprises a plurality of powder conveying units, wherein the powder conveying units comprise a first valve (1) for powder to enter and a second valve (2) for powder to flow out, and the powder conveying units also comprise a containing chamber for containing inhaled powder, wherein the first valve (1) and the second valve (2) are both connected to the containing chamber, the first valves (1) of all powder conveying units are connected, and the second valves (2) of all powder conveying units are connected, and when the powder conveying assembly is working, the first valve (1) and the second valve (2) of each powder conveying unit are switched on and off alternately, and when the first valves (1) of some powder conveying units are opened and the second valves (2) are closed, the first valves (1) of the remaining powder conveying units are closed and the second valves (2) are opened.

2. The powder delivery assembly according to claim 1, characterized in that: The powder conveying unit comprises a shell (8), the first valve (1) and the second valve (2) are both located on the shell (8), the accommodating chamber is located inside the shell (8), and the accommodating chamber is a fluidizing tube (3), and a hole for allowing gas to pass through and preventing powder from passing through is provided on the tube body of the fluidizing tube (3).

3. The powder delivery assembly according to claim 2, characterized in that: A pneumatic gap is left between the fluidizing tube (3) and the shell (8), and the powder conveying unit further comprises a positive and negative pressure switching interface (4) connected to the pneumatic gap.

4. The powder delivery assembly according to any one of claims 1 to 3, characterized in that: The powder conveying assembly also includes a first conduit (91) and a second conduit (92), wherein the first conduit (91) connects the first valves (1) of all the powder conveying units, and the second conduit (92) connects the second valves (2) of all the powder conveying units.

5. The powder delivery assembly according to claim 3, characterized in that: The powder conveying unit further comprises a first auxiliary interface (5) arranged between the first valve (1) and the positive and negative pressure switching interface (4), the first auxiliary interface (5) being connected to the pneumatic gap; and / or further comprises a second auxiliary interface (6) arranged between the second valve (2) and the positive and negative pressure switching interface (4), the second auxiliary interface (6) being connected to the pneumatic gap.

6. The powder delivery assembly according to claim 3, characterized in that: The distance between the positive and negative pressure switching interface (4) and the first valve (1) is shorter than the distance between the positive and negative pressure switching interface (4) and the second valve (2).

7. The powder delivery assembly according to claim 2 or 3, characterized in that: The first valve (1) comprises a valve housing (11), and a soft pipe (12) arranged inside the valve housing (11), wherein the soft pipe (12) is connected to the fluidizing tube (3); the powder conveying unit also comprises a pneumatic interface (7) for introducing compressed air to deform the soft pipe (12), the valve housing (11) is provided with two oppositely arranged air vents, the pneumatic interface (7) is connected to the two air vents, and when air is ventilated into the pneumatic interface (7), air flows into the valve housing (11) from the air vents to squeeze the soft pipe (12), so that the inner walls of the soft pipe (12) are close to each other and reach a closed state when they are tightly attached; and / or the structure of the second valve (2) is the same as that of the first valve (1).

8. The powder delivery assembly according to claim 2 or 3, characterized in that: The housing (8) includes a delivery pipe (80), a first valve body shell (81) and a second valve body shell (82) respectively sleeved on both ends of the delivery pipe (80), a first quick-connect joint (83) plugged into the first valve body shell (81) and a second quick-connect joint (84) plugged into the second valve body shell (82), and also includes a first pressing cover (85) for pressing the first quick-connect joint (83) onto the first valve body shell (81) and a second pressing cover (86) for pressing the second quick-connect joint (84) onto the second valve body shell (82).

9. The powder delivery assembly according to claim 2 or 3, characterized in that: The fluidizing tube (3) comprises a first inner fluidizing tube (31), a main fluidizing tube (32) and a second inner fluidizing tube (33); the first inner fluidizing tube (31) is connected to the first valve (1), the second inner fluidizing tube (33) is connected to the second valve (2), and the two ends of the main fluidizing tube (32) are connected to the first inner fluidizing tube (31) and the second inner fluidizing tube (33) respectively; the inner diameter of the first inner fluidizing tube (31) gradually expands from the first valve (1) to the main fluidizing tube (32), and the inner diameter of the second inner fluidizing tube (33) gradually contracts from the main fluidizing tube (32) to the second valve (2).

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