Powder conveying mechanism for electrostatic powder spray gun

Abstract

The powder conveying mechanism for the electrostatic powder spray gun comprises a negative pressure assembly, a powder barrel and a conveying piece, and the negative pressure assembly is used for generating negative pressure; the powder cylinder is used for storing powder; the conveying part comprises a first conveying pipe and a second conveying pipe, the first conveying pipe is used for communicating the negative pressure assembly with the powder barrel, and the second conveying pipe is used for communicating the powder barrel with the nozzle; and the second conveying pipe is communicated with the first conveying pipe through the powder cylinder. According to the conveying part, a gas channel and a powder channel can be combined into a whole, the nozzle only needs to be communicated with one channel and does not need to be connected with two channels in parallel, the structures of the gas channel and the powder channel conveying part are connected in series, and the structure is simplified while the size of the nozzle is reduced; and when the gas passes through the powder cylinder, the powder in the powder cylinder can be fully fluidized, so that the powder can uniformly enter the conveying piece, the probability that the powder is accumulated in the nozzle is reduced, and the spraying effect is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of powder electrostatic spray gun, in particular to a powder conveying mechanism for powder electrostatic spray gun. BACKGROUND

[0002] In the existing powder electrostatic spray gun, an electrostatic module, a powder cylinder and a nozzle are provided, the powder cylinder is connected with the nozzle through a powder conveying pipe, the nozzle is provided with an air pipe communicated with an air source, and the air pipe and the powder conveying pipe are separately provided; the air source passes through the air pipe to generate high pressure airflow in the nozzle, and then the powder in the powder cylinder is sucked into the nozzle to be sprayed out of the nozzle.

[0003] However, in this structure, it is necessary to ensure that the nozzle has a large enough space for simultaneously connecting the air pipe and the powder conveying pipe, therefore, the nozzle needs to be set too large to ensure that the powder conveying pipe and the air pipe have enough space to simultaneously install the air pipe and the powder conveying pipe to ensure that the powder is fluidized in the nozzle; however, such a small fluidization space may cause poor powder fluidization effect, poor powder charging effect and affect the spraying effect. On the other hand, a vacuum pump or other related equipment needs to be connected outside the spray gun, which makes the entire spraying device structure too complex.

[0004] Therefore, the powder conveying mechanism of the powder electrostatic spray gun in the prior art has further improvement space. CONTENT OF THE INVENTION

[0005] Therefore, in view of the technical problem that the powder conveying structure in the prior art powder electrostatic spray gun is too complex to make the nozzle too large, the present application provides a powder conveying mechanism for powder electrostatic spray gun, which comprises a negative pressure assembly, a conveying member and a powder cylinder, the powder cylinder is located between the nozzle and the negative pressure assembly, the conveying member is used to connect the powder cylinder with the nozzle and the negative pressure assembly, a first conveying pipe and a powder pipe are arranged on the same flow path, the nozzle only needs to be connected with the powder pipe, and the nozzle does not need to be set too large and has a simple structure.

[0006] The present application provides a powder conveying mechanism for powder electrostatic spray gun, comprising:

[0007] A negative pressure assembly is used to generate negative pressure;

[0008] A powder cylinder is used to store powder;

[0009] A conveying member comprises a first conveying pipe and a second conveying pipe, the first conveying pipe is used to connect the negative pressure assembly with the powder cylinder, and the second conveying pipe is used to connect the powder cylinder with the nozzle;

[0010] The second conveying pipe and the first conveying pipe are connected through the powder cylinder.

[0011] Compared with the prior art, the powder electrostatic spraying gun powder conveying mechanism in the application is arranged on the conveying member, the conveying member is located between the negative pressure assembly and the nozzle and is in communication with the powder cylinder, the gas in the negative pressure assembly can be guided into the powder cylinder, and then the powder in the powder cylinder is guided into the nozzle, that is, the conveying member in the application can combine the gas channel and the powder channel into one, so that the nozzle only needs to be in communication with one channel and does not need to be connected in parallel with two channels, the structure of the gas channel and the powder channel conveying member in the application is in series, the volume of the nozzle is reduced, and the structure is simplified; and when the gas passes through the powder cylinder, the powder in the powder cylinder can be fully fluidized, so that the powder can uniformly enter the conveying member, the probability of powder accumulation in the nozzle is reduced, and the spraying effect is improved.

[0012] Preferably, the first conveying pipe comprises a first gas pipe and a second gas pipe, the first gas pipe is in communication with the negative pressure assembly, and the second gas pipe is in communication with the powder cylinder;

[0013] The axis of the first gas pipe is perpendicular to the axis of the second gas pipe;

[0014] And / or,

[0015] The second conveying pipe comprises a third gas pipe and a fourth gas pipe, the third gas pipe is in communication with the nozzle, and the fourth gas pipe is in communication with the powder cylinder;

[0016] The axis of the third gas pipe is perpendicular to the axis of the fourth gas pipe.

[0017] Preferably, the application further comprises:

[0018] A first guide part is arranged between the first gas pipe and the second gas pipe and is used for guiding the fluid in the first gas pipe to the second gas pipe smoothly;

[0019] The first guide part is an arc structure;

[0020] And / or,

[0021] A second guide part is arranged between the third gas pipe and the fourth gas pipe and is used for guiding the fluid in the fourth gas pipe to the third gas pipe smoothly;

[0022] The second guide part is an arc structure.

[0023] Preferably, the second gas pipe and the fourth gas pipe are arranged in parallel and at intervals, and the axes of the first gas pipe and the second gas pipe are on the same straight line;

[0024] The inner diameter of the first gas pipe is greater than the inner diameter of the second gas pipe, and the inner diameter of the third gas pipe is greater than the inner diameter of the fourth gas pipe;

[0025] The length of the second gas pipe is greater than the length of the first gas pipe, and the length of the fourth gas pipe is greater than the length of the third gas pipe.

[0026] Preferably, the opening between the first guide part and the second guide part gradually expands in a direction away from the powder cartridge;

[0027] A reinforcing rib is arranged between the first guide part and the second guide part.

[0028] Preferably, the mounting shell is provided with a first mounting cavity, a second mounting cavity and a third mounting cavity;

[0029] The first mounting cavity is used for mounting the first air pipe;

[0030] The second mounting cavity is used for mounting the third air pipe;

[0031] The third mounting cavity is used for mounting the second air pipe and the fourth air pipe.

[0032] Preferably, a first limiting cylinder is arranged in the first mounting cavity, and the first limiting cylinder is sleeved outside the first air pipe;

[0033] A first sealing ring is arranged between the first limiting cylinder and the first air pipe;

[0034] And / or,

[0035] A second limiting cylinder is arranged in the second mounting cavity, and the second limiting cylinder is sleeved outside the third air pipe;

[0036] A second sealing ring is arranged between the second limiting cylinder and the third air pipe.

[0037] Preferably, a first limiting block is arranged outside the first air pipe, the first limiting block is provided in plurality, and an outer diameter of the first limiting block is greater than an inner diameter of the first limiting cylinder;

[0038] And / or,

[0039] A second limiting block is arranged outside the third air pipe, the second limiting block is provided in plurality, and an outer diameter of the second limiting block is greater than an inner diameter of the second limiting cylinder.

[0040] Preferably, a mounting part is arranged on the conveying member, and the mounting part is arranged at an outlet end of the second air pipe;

[0041] A connecting part is arranged on the powder cartridge, and the connecting part is detachably connected with the mounting part.

[0042] Preferably, a center line of the mounting part is a symmetry line between the second air pipe and the fourth air pipe;

[0043] An inner thread is arranged on an inner side wall of the connecting part, and an outer thread matched with the inner thread is arranged on an outer side wall of the connecting part.

[0044] The powder conveying mechanism for the powder electrostatic spraying gun of the application also has the following technical effects:

[0045] 1. By vertically arranging the first air pipe and the second air pipe, the first conveying pipe structure is reasonably planned, so that the first conveying pipe can be in communication with the negative pressure assembly at the rear end of the spraying gun and the powder cartridge at the lower end of the spraying gun, ensuring smooth transmission of the gas and minimizing the volume of the entire spraying gun; the second conveying pipe structure is the same;

[0046] 2. By arranging the first guide part in the first conveying pipe, the first guide part can gently guide the flow of the fluid, reduce the resistance of the fluid flow, and reduce the excessive wind pressure decay; the second guide part in the second conveying pipe has the same effect;

[0047] 3. By arranging the first limiting cylinder, the first air pipe can be circumferentially limited, and the sealing ring can ensure the sealing between the first limiting cylinder and the first air pipe, and ensure the sealing of the communication between the first mounting cavity and the first air pipe; the second limiting cylinder and the third air pipe have the same effect;

[0048] 4. By arranging the mounting part, the detachable connection of the powder cartridge and the conveying part can be realized, and the powder cartridge can be easily disassembled and refilled. BRIEF DESCRIPTION OF DRAWINGS

[0049] Figure 1 is a cross-sectional structure schematic of the powder conveying mechanism in the spraying gun provided by an embodiment of the application Figure 1 ;

[0050] Figure 2 is a cross-sectional structure schematic of the powder conveying mechanism in the spraying gun provided by an embodiment of the application Figure 2 ;

[0051] Figure 3 is a three-dimensional structure schematic of the conveying part provided by an embodiment of the application Figure 1 ;

[0052] Figure 4 is a three-dimensional structure schematic of the conveying part provided by an embodiment of the application Figure 2 ;

[0053] Figure 5 is Figure 1 a partial A enlarged schematic view;

[0054] Figure 6 is Figure 2 a partial B enlarged schematic view.

[0055] Reference signs: 1, conveying part; 2, negative pressure assembly; 3, mounting shell; 4, powder cartridge; 5, first sealing ring; 6, second sealing ring; 7, nozzle;

[0056] 11, first conveying pipe; 12, second conveying pipe; 13, mounting portion; 14, reinforcing rib;

[0057] 111, first air pipe; 112, second air pipe; 113, first guide portion; 114, first sealing groove; 115, first limiting block;

[0058] 121, third air pipe; 122, fourth air pipe; 123, second guide portion; 124, second sealing groove; 125, second limiting block;

[0059] 31, first mounting cavity; 32, second mounting cavity; 33, third mounting cavity;

[0060] 311, first limiting cylinder; 321, second limiting cylinder;

[0061] 41, connecting portion. DETAILED DESCRIPTION

[0062] In order to make the technical personnel in the art better understand the technical solutions of the present disclosure, the present disclosure will be described in detail, clearly and completely in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present disclosure and do not limit the present disclosure.

[0063] In the description of the present application, if the first, second is described only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the sequence of indicated technical features.

[0064] Those skilled in the art should understand that in the disclosure of the present application, the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore the above terms cannot be understood as a limitation of the present application.

[0065] The present application will be further described in detail below in combination with the drawings, see Figures 1 to 6 Description.

[0066] The present application provides a powder conveying mechanism for powder electrostatic spray gun, which is used for powder conveying of powder electrostatic spray gun, and conveys the powder in the powder cylinder 4 to the nozzle 7.

[0067] Specifically, as Figures 1 to 2As shown in the figure, the powder electrostatic spray gun comprises a mounting shell 3, a nozzle 7, a negative pressure assembly 2, an electrostatic generator, a conveying piece 1 and a powder cylinder 4, the mounting shell 3 is in the shape of a gun, and the nozzle 7 is mounted at the front end of the mounting shell 3; the electrostatic generator is located at the upper end of the nozzle 7, and is used to add static electricity to the powder in the nozzle 7; the negative pressure assembly 2 is located at the rear end of the mounting shell 3, and comprises a fan, which is used to generate a negative pressure airflow; the powder cylinder 4 is located between the nozzle 7 and the negative pressure assembly 2 and at the lower end of the mounting shell 3, and is used to store powder; the conveying piece 1 is located between the nozzle 7 and the negative pressure assembly 2 and in the mounting shell 3, the front end of the conveying piece 1 is in communication with the nozzle 7, the rear end is in communication with the negative pressure assembly 2, and the lower end is in communication with the powder cylinder 4, and the conveying piece 1 is used to guide the negative pressure gas of the negative pressure assembly 2 into the powder cylinder 4 and to guide the powder in the powder cylinder 4 into the nozzle 7.

[0068] As shown in the figure, Figure 1 , Figures 3 to 6 the conveying piece 1 comprises a first conveying pipe 11 and a second conveying pipe 12, and the first conveying pipe 11 is located behind the second conveying pipe 12; the rear end of the first conveying pipe 11 is in communication with the negative pressure assembly 2, and the lower end of the first conveying pipe 11 is in communication with the powder cylinder 4, so that the negative pressure assembly 2 is in communication with the powder cylinder 4 through the first conveying pipe 11, and the negative pressure airflow generated by the negative pressure assembly 2 can be guided into the powder cylinder 4 through the first conveying pipe 11; the front end of the second conveying pipe 12 is in communication with the nozzle 7, and the lower end is in communication with the powder cylinder 4, so that the powder cylinder 4 is in communication with the nozzle 7 through the second conveying pipe 12, so as to guide the powder into the nozzle 7 under the action of the negative pressure airflow; in this embodiment, the second conveying pipe 12 is in communication with the first conveying pipe 11 through the powder cylinder 4, that is, the first conveying pipe 11 and the second conveying pipe 12 are in series communication, and the negative pressure fluid sequentially passes through the first conveying pipe 11, the powder cylinder 4 and the second conveying pipe 12 to reach the nozzle 7, and in the negative pressure fluid flow path, the powder in the powder cylinder 4 is carried into the nozzle 7.

[0069] In this embodiment, the conveying piece 1 can combine the gas channel and the powder channel into one, and does not need to be connected in parallel with the two channels, so that the nozzle 7 only needs to be in communication with one channel, thereby reducing the volume of the nozzle 7 and simplifying the structure; and when the gas passes through the powder cylinder 4, the powder in the powder cylinder 4 can be fully fluidized, so that the powder can uniformly enter the conveying piece 1, thereby reducing the probability of powder accumulation in the nozzle 7 and improving the spraying effect.

[0070] Further, the conveying piece 1 is further described as shown in the figure, Figure 1 , Figures 3 to 6As shown, the first conveying pipe 11 includes a first air pipe 111 and a second air pipe 112, the axis of the first air pipe 111 is perpendicular to the axis of the second air pipe 112; the rear end of the first air pipe 111 is communicated with the negative pressure assembly 2, the upper end of the second air pipe 112 is communicated with the front end of the first air pipe 111, and the lower end of the second air pipe 112 is communicated with the powder cylinder 4; wherein the first air pipe 111 is arranged parallel to the spraying direction of the spray gun, that is, the first air pipe 111 is arranged along the front-rear direction;

[0071] The second conveying pipe 12 includes a third air pipe 121 and a fourth air pipe 122, the axis of the third air pipe 121 is perpendicular to the axis of the fourth air pipe 122; the front end of the third air pipe 121 is communicated with the nozzle 7, the upper end of the fourth air pipe 122 is communicated with the rear end of the third air pipe 121, and the lower end of the fourth air pipe 122 is communicated with the powder cylinder 4; wherein as shown in Figure 2 、 Figure 5 As shown, the third air pipe 121 is arranged parallel to the first air pipe 111, as shown in Figure 4 、 Figure 5 As shown, the second air pipe 112 is arranged parallel to the fourth air pipe 122, the lower end of the second air pipe 112 is independent of the lower end of the fourth air pipe 122, and there is a space between the two, on the one hand, it is convenient for installation and positioning, on the other hand, it reduces the interference between the two, and ensures the stability of the respective fluid conveying.

[0072] In the embodiment, as shown in Figures 1 to 2 、 Figures 5 to 6 The mounting shell 3 is provided with a mounting cavity, the mounting cavity is used for mounting the conveying member 1, and is communicated with the mounting positions of the nozzle 7 and the negative pressure assembly 2; as shown in Figure 1 The mounting cavity is roughly in a T-shaped structure, and can be divided into a first mounting cavity 31, a second mounting cavity 32 and a third mounting cavity 33, the first mounting cavity 31 is on the same straight line as the second mounting cavity 32, the first mounting cavity 31 is used for mounting the first air pipe 111, the second mounting cavity 32 is used for mounting the third air pipe 121, and the third mounting cavity 33 is used for mounting the second air pipe 112 and the fourth air pipe 122.

[0073] The negative pressure assembly 2 is mounted at the rear end of the first mounting cavity 31, the negative pressure fluid generated by the negative pressure assembly 2 enters the first air pipe 111 through the first mounting cavity 31, and then enters the second air pipe 112 through the first air pipe 111. The nozzle 7 is mounted at the front end of the second mounting cavity 32, the powder in the powder cylinder 4 enters the fourth air pipe 122 under the action of the negative pressure fluid, then enters the third air pipe 121 through the fourth air pipe 122, and finally flows into the second mounting cavity 32 and the nozzle 7 from the front end of the third air pipe 121.

[0074] On the basis of the above embodiment, the first mounting cavity 31 and the first air pipe 111 are further developed; as shown in Figure 3 、 Figure 4 、 Figure 6As shown, the first installation cavity 31 is provided with a first limiting cylinder 311, the first limiting cylinder 311 is sleeved outside the first air pipe 111, the first limiting cylinder 311 limits the first air pipe 111 in the circumferential direction, and the connection stability of the first air pipe 111 and the first installation cavity 31 is ensured; at the same time, the first air pipe 111 is provided with a first sealing groove 114, the first sealing groove 114 is used for placing a first sealing ring 5, the first sealing ring 5 acts between the first limiting cylinder 311 and the first air pipe 111, and is used for sealing between the first limiting cylinder 311 and the first air pipe 111, so as to prevent gas generated by the negative pressure assembly 2 from leaking out from between the first limiting cylinder 311 and the first air pipe 111.

[0075] As shown in Figure 6 , the first installation cavity 31 includes a communication cavity, the inner diameter of the communication cavity is the same as the inner diameter of the first air pipe 111, the first limiting cylinder 311 is located at the front end of the communication cavity, the inner diameter of the first limiting cylinder 311 is the same as the outer diameter of the first air pipe 111, and a limiting step is formed between the communication cavity and the first limiting cylinder 311, and the rear end of the first air pipe 111 abuts against the limiting step.

[0076] Further, as shown in Figure 3 , Figure 4 , Figure 6 , the first air pipe 111 is provided with a first limiting block 115, the first limiting block 115 protrudes outward in the radial direction, the first limiting block 115 is provided in plurality, the outer diameter of the first limiting block 115 is greater than the inner diameter of the first limiting cylinder 311, the rear end of the first limiting block 115 abuts against the front end of the first limiting cylinder 311, and the first limiting block 115 is used for assisting the installation and limiting of the first air pipe 111; and the contact area of the first air pipe 111 and the first limiting cylinder 311 is increased, so as to ensure the installation stability of the first air pipe 111 and the first limiting cylinder 311. In this embodiment, the first limiting block 115 is provided in two, and the two first limiting blocks 115 are equidistantly arranged around the outer periphery of the first air pipe 111.

[0077] Similarly, as shown in Figure 3 , Figure 4 , Figure 6 , the second installation cavity 32 is provided with a second limiting cylinder 321, the second limiting cylinder 321 is sleeved outside the third air pipe 121, the second limiting cylinder 321 limits the third air pipe 121 in the circumferential direction, and the connection stability of the third air pipe 121 and the second installation cavity 32 is ensured; at the same time, the second air pipe 112 is provided with a second sealing groove 124, the second sealing groove 124 is used for placing a second sealing ring 6, the second sealing ring 6 acts between the second limiting cylinder 321 and the third air pipe 121, and is used for sealing between the second limiting cylinder 321 and the third air pipe 121, so as to prevent the powder flowing out from the powder cylinder 4 from leaking out from between the second limiting cylinder 321 and the third air pipe 121.

[0078] As shown in Figure 6As shown, the second installation cavity 32 includes a communication cavity with an inner diameter same as that of the third air pipe 121, and a second limiting cylinder 321 located at the rear end of the communication cavity and having an inner diameter same as that of the third air pipe 121, so that a limiting step is formed between the communication cavity and the second limiting cylinder 321, and the front end of the third air pipe 121 abuts against the limiting step.

[0079] Further, as shown in Figure 3 、 Figure 4 、 Figure 6 As shown, the third air pipe 121 is externally provided with a second limiting block 125 protruding radially outward, the second limiting block 125 is provided in multiple, the outer diameter of the second limiting block 125 is greater than the inner diameter of the second limiting cylinder 321, the front end of the second limiting block 125 abuts against the rear end of the second limiting cylinder 321, and the second limiting block 125 is used to assist the installation limiting of the third air pipe 121; and the contact area between the third air pipe 121 and the second limiting cylinder 321 is increased to ensure the installation stability of the third air pipe 121 and the second limiting cylinder 321. In this embodiment, the second limiting block 125 is provided in two, and the two second limiting blocks 125 are equidistantly arranged around the outer periphery of the third air pipe 121.

[0080] On the basis of any of the above embodiments, the third installation cavity 33 and the conveying member 1 are further expanded; as shown in Figure 1 、 Figure 5 The lower end of the third installation cavity 33 is provided with an opening for the lower end of the conveying member 1 to pass out, so that the lower end of the conveying member 1 is exposed outside the installation shell 3; wherein the lower end of the conveying member 1 is provided with an installation part 13, the installation part 13 is a cylindrical structure, the installation part 13 is arranged at the outlet end of the second air pipe 112, and the installation part 13 is arranged around the outside of the second air pipe 112 and the fourth air pipe 122, wherein the central axis of the installation part 13 is the symmetry line between the second air pipe 112 and the fourth air pipe 122, that is, the first conveying pipe 11 and the second conveying pipe 12 are symmetrically arranged with the central line of the installation part 13 as the symmetry line.

[0081] As shown in Figure 4 、 Figure 5 The inner side wall of the installation part 13 is provided with an internal thread; the upper end of the powder cylinder 4 is provided with a connecting part 41, and the outer side wall of the connecting part 41 is provided with an external thread matched with the internal thread, that is, the connecting part 41 and the installation part 13 are detachably connected through thread cooperation, that is, the powder cylinder 4 and the conveying member 1 are detachably connected through thread cooperation, which facilitates the user to quickly detach the powder cylinder 4 for refilling and improves the use convenience.

[0082] On the basis of any of the above embodiments, the conveying member 1 is further expanded.

[0083] As shown in Figure 3 、 Figures 5 to 6As shown, the first conveying pipe 11 is provided with a first guide portion 113, which is located between the first air pipe 111 and the second air pipe 112, has a circular arc structure, and has a concave surface facing the fluid flow direction, and an arc of the first guide portion 113 is arranged between 50-70 degrees; in the embodiment, the arc of the first guide portion 113 is preferably 60 degrees. The upper end of the first guide portion 113 is connected with the front end of the first air pipe 111, and the lower end of the first guide portion 113 is connected with the upper end of the second air pipe 112; the length of the first guide portion 113 along the axis of the first air pipe 111 is greater than the inner diameter of the second air pipe 112, and the length of the first guide portion 113 along the axis of the second air pipe 112 is greater than the inner diameter of the first air pipe 111, so as to increase the smoothness of the connection of the first guide portion 113 with the first air pipe 111 and the second air pipe 112, reduce the angle, the second guide portion 123 can reduce the resistance when the fluid flows, avoid that the pressure attenuation of the negative pressure fluid is too large, so as to facilitate the smooth guiding of the fluid in the first air pipe 111 into the second air pipe 112 as much as possible, and also can ensure that the negative pressure fluid has sufficient pressure.

[0084] As shown in the drawings, Figure 5 The inner diameter of the first air pipe 111 is greater than that of the second air pipe 112, and the length of the second air pipe 112 is greater than that of the first air pipe 111, that is, by reasonably arranging the structural parameters of the first air pipe 111 and the second air pipe 112, reasonably shortening the length of the first air pipe 111 and increasing the pipe diameter of the first air pipe 111, the frictional resistance of the negative pressure fluid in the transmission process in the first air pipe 111 can be reduced, the wind pressure attenuation is reduced, and the negative pressure fluid can smoothly enter the second air pipe 112.

[0085] Similarly, as shown in the drawings, Figure 3 , Figures 5 to 6As shown, the second conveying pipe 12 is provided with a second guide portion 123, which is located between the third air pipe 121 and the fourth air pipe 122. The second guide portion 123 is in a circular arc structure, the concave surface of the second guide portion 123 faces the fluid flow direction, and the radian of the second guide portion 123 is set to be between 50-70 degrees. In this embodiment, the radian of the second guide portion 123 is preferably 60 degrees. The upper end of the second guide portion 123 is connected with the front end of the third air pipe 121, and the lower end of the second guide portion 123 is connected with the upper end of the fourth air pipe 122. The length of the second guide portion 123 along the axis of the third air pipe 121 is greater than the inner diameter of the fourth air pipe 122, and the length of the second guide portion 123 along the axis of the fourth air pipe 122 is greater than the inner diameter of the third air pipe 121. Therefore, the flatness of the connection between the second guide portion 123 and the third air pipe 121 and the fourth air pipe 122 is increased, the angle is reduced, the resistance of the fluid flow is reduced, the pressure attenuation of the negative pressure fluid is avoided from being too large, so that the fluid in the fourth air pipe 122 is guided into the third air pipe 121 as flat as possible, and at the same time, the negative pressure fluid is ensured to have sufficient pressure.

[0086] As shown in Figure 5 , Figure 6 , the opening formed between the first guide portion 113 and the second guide portion 123 is in a horn shape, and the caliber of the opening gradually expands in the direction away from the powder cylinder 4. The first guide portion 113 and the second guide portion 123 are provided with a reinforcing rib 14, which is arranged in the front-rear direction. The front end of the reinforcing rib 14 is connected with the middle position of the rear end of the second guide portion 123, and the rear end of the reinforcing rib 14 is connected with the middle position of the front end of the first guide portion 113, so as to structurally reinforce the first guide portion 113 and the second guide portion 123, and ensure the structural stability of the first guide portion 113 and the second guide portion 123.

[0087] In addition, in another optional embodiment, the lower end portion (inner ring) where the first air pipe 111 is connected with the second air pipe 112 can also be provided with a guide portion in an arc structure. Similarly, the lower end portion (inner ring) where the third air pipe 121 is connected with the fourth air pipe 122 can also be provided with a guide portion in an arc structure.

[0088] As shown in Figure 5 , the inner diameter of the third air pipe 121 is greater than the inner diameter of the fourth air pipe 122, and the length of the fourth air pipe 122 is greater than the length of the third air pipe 121. That is, by reasonably setting the structural parameters of the third air pipe 121 and the fourth air pipe 122, the length of the third air pipe 121 is reasonably shortened, and the pipe diameter of the third air pipe 121 is increased. Therefore, the frictional resistance of the negative pressure fluid in the transmission process in the third air pipe 121 is reduced, the wind pressure attenuation is reduced, and the negative pressure fluid can smoothly enter the fourth air pipe 122.

[0089] In the embodiment, the diameters of the second air pipe 112 and the fourth air pipe 122 are much smaller than the inner cavity of the powder cylinder 4. When the negative pressure gas flows out of the second air pipe 112, the flow rate increases, and the negative pressure gas can quickly enter the powder cylinder 4, and the effect on the powder in the powder cylinder 4 is increased, so that the powder in the powder cylinder 4 can be completely suspended and exhibit a good fluidized state. When the powder in the powder cylinder 4 enters the fourth air pipe 122, the flow diameter decreases rapidly, and the fluid pressure increases, so that the powder has enough pressure to enter the fourth air pipe 122 and move upward along the fourth air pipe 122 into the third air pipe 121. Since the inner diameter of the third air pipe 121 is greater than the inner diameter of the fourth air pipe 122, when the powder enters the third air pipe 121 from the fourth air pipe 122, the flow rate of the powder increases again, and the powder fluidization effect increases, ensuring that the powder entering the nozzle 7 from the third air pipe 121 has a good fluidized state in the nozzle 7, so that the powder particles are more easily charged by the electrostatic field, improving the efficiency and adsorption effect of electrostatic spraying.

[0090] It should be noted that the embodiments of the present application can be combined into new embodiments as long as the schemes do not conflict and the technical schemes can coexist.

[0091] The above has introduced the present application in detail, and the principle and implementation mode of the present application have been described by applying specific examples. The above embodiment description is only used to help understand the present application and the core idea. It should be pointed out that for ordinary skilled in the art, without departing from the principle of the present application, the present application can be improved and modified in several ways, and these improvements and modifications also fall within the protection scope of the present application.

Claims

1. A powder delivery mechanism for a powder electrostatic spray gun, characterized by, The powder electrostatic spraying gun powder conveying mechanism comprises a negative pressure component (2) for generating negative pressure, a powder cylinder (4) for storing powder, a conveying member (1) comprising a first conveying pipe (11) for connecting the negative pressure component (2) with the powder cylinder (4) and a second conveying pipe (12) for connecting the powder cylinder (4) with a nozzle (7), wherein the second conveying pipe (12) is connected with the first conveying pipe (11) through the powder cylinder (4).

2. The powder electrostatic spraying gun powder conveying mechanism according to claim 1, wherein the first conveying pipe (11) comprises a first air pipe (111) connected with the negative pressure component (2) and a second air pipe (112) connected with the powder cylinder (4), wherein the axis of the first air pipe (111) is perpendicular to the axis of the second air pipe (112); and / or the second conveying pipe (12) comprises a third air pipe (121) connected with the nozzle (7) and a fourth air pipe (122) connected with the powder cylinder (4), wherein the axis of the third air pipe (121) is perpendicular to the axis of the fourth air pipe (122). Further comprising: a first guide part (113) arranged between the first air pipe (111) and the second air pipe (112) for smoothly guiding the fluid in the first air pipe (111) into the second air pipe (112); the first guide part (113) is an arc structure; and / or a second guide part (123) arranged between the third air pipe (121) and the fourth air pipe (122) for smoothly guiding the fluid in the fourth air pipe (122) into the third air pipe (121); the second guide part (123) is an arc structure.

4. The powder electrostatic spraying gun powder conveying mechanism according to claim 3, wherein the second air pipe (112) and the fourth air pipe (122) are arranged in parallel and spaced apart, the axis of the first air pipe (111) and the second air pipe (112) are on the same line; the inner diameter of the first air pipe (111) is larger than that of the second air pipe (112), and the inner diameter of the third air pipe (121) is larger than that of the fourth air pipe (122); the length of the second air pipe (112) is greater than that of the first air pipe (111), and the length of the fourth air pipe (122) is greater than that of the third air pipe (121).

5. The powder electrostatic spraying gun powder conveying mechanism according to claim 3, wherein the opening between the first guide part (113) and the second guide part (123) gradually expands in a direction away from the powder cylinder (4); and a reinforcing rib (14) is arranged between the first guide part (113) and the second guide part (123).

6. The powder electrostatic spraying gun powder conveying mechanism according to claim 3, wherein a mounting shell (3) is provided with a first mounting cavity (31), a second mounting cavity (32) and a third mounting cavity (33); the first mounting cavity (31) is used for mounting the first air pipe (111); ​ ​ ​ ​ ​ 3. The powder delivery mechanism for a powder electrostatic spray gun according to claim 2, wherein ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The second installation cavity (32) is used for installing a third air pipe (121); The third installation cavity (33) is used for installing a second air pipe (112) and a fourth air pipe (122).

7. The powder conveying mechanism for a powder electrostatic spray gun according to claim 6, wherein, The first installation cavity (31) is provided with a first limiting cylinder (311) sleeved outside the first air pipe (111); The first limiting cylinder (311) and the first air pipe (111) are provided with a first sealing ring (5); And / or, The second installation cavity (32) is provided with a second limiting cylinder (321) sleeved outside the third air pipe (121); The second limiting cylinder (321) and the third air pipe (121) are provided with a second sealing ring (6).

8. The powder conveying mechanism for a powder electrostatic spray gun according to claim 7, wherein, The first air pipe (111) is provided with a first limiting block (115), and the first limiting block (115) is provided in plurality, and the outer diameter of the first limiting block (115) is greater than the inner diameter of the first limiting cylinder (311); And / or, The third air pipe (121) is provided with a second limiting block (125), and the second limiting block (125) is provided in plurality, and the outer diameter of the second limiting block (125) is greater than the inner diameter of the second limiting cylinder (321).

9. The powder conveying mechanism for a powder electrostatic spray gun according to claim 1, wherein, The conveying member (1) is provided with a mounting portion (13) at the outlet end of the second air pipe (112); The powder cylinder (4) is provided with a connecting portion (41) which is detachably connected with the mounting portion (13).

10. The powder conveying mechanism for a powder electrostatic spray gun according to claim 9, wherein, The symmetry line between the second air pipe (112) and the fourth air pipe (122) is the center line of the mounting portion (13); The inner side wall of the connecting portion (41) is provided with an internal thread, and the outer side wall of the connecting portion (41) is provided with an external thread matched with the internal thread.

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