Powder spray gun nozzle and spray gun

Abstract

The powder spray gun nozzle comprises a shell, an electrode holder and a discharge assembly, one end of the electrode holder is connected with the shell, the other end of the electrode holder extends out of the shell, a mounting channel is arranged in the electrode holder, the discharge assembly comprises an electrode needle and a conductive ring, the electrode needle is arranged in the mounting channel, and the conductive ring is arranged in the mounting channel. A mounting channel is formed in the shell, the electrode needle is arranged in the length direction of the mounting channel and extends out of the mounting channel, the conducting ring is connected to the shell, a power-on opening is formed in the shell, the power-on opening is communicated with the mounting channel, and the electrode needle can be connected with the conducting ring through the power-on opening; the powder spray gun nozzle and the spray gun provided by the utility model have the beneficial effects of simple structure and convenience in operation; the electric conduction mode of the electrode needle is optimized, electrification through complex circuit arrangement is not needed any more, and maintenance and overhaul work of operators is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of powder electrostatic spraying equipment, in particular to a powder spray gun nozzle and a spray gun. Background Art

[0002] Electrostatic spraying refers to a coating method that uses the principle of corona discharge to make the atomized paint negatively charged under the action of a high-voltage DC electric field, and then adsorbed on the surface of a positively charged substrate to discharge. Existing corona spray guns usually install an electrode needle in the nozzle. The electrode needle is connected to high-voltage static electricity, and corona discharge is generated at the tip, generating dense negative charges near the electrode; when the powder is sprayed from the head of the electrostatic powder spray gun, the charge is captured to become charged powder, which flies to the grounded workpiece under the action of airflow and electric field, and adsorbs on the surface of the workpiece, thereby completing the coating of the workpiece.

[0003] Since the electrode needle usually needs to be connected to the circuit on the spray gun body to be powered, and there are still many ways on the market to power the electrode needle through wired connection; such as the nozzle for electrostatic spray gun disclosed in China CN111203335A, which specifically discloses that an electrode connector is provided on the nozzle, and the electrode is electrically connected to the electrode connector through a wire, and then plugged into the electrode interface on the spray gun through the electrode connector. Therefore, this traditional way of electrical connection through wires also has many problems: for example, it is necessary to arrange complex circuits in the nozzle, and after long-term use, it is not convenient to repair once there is a problem with the circuit, which increases the difficulty of maintenance for operators; in addition, the stability of the plug-in between the electrode connector and the electrode interface is also difficult to guarantee. Once it becomes loose during use, it may cause the connector to fall off the interface, which in turn causes the electrode to fail to discharge normally, affecting the final spraying effect.

[0004] Therefore, it is necessary to improve the existing technology and provide a powder spray gun nozzle with reasonable structure and simple operation. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model provides a powder spray gun nozzle and a spray gun which are simple in structure and easy to operate.

[0006] In order to solve the above technical problems, the technical solution used in the utility model is:

[0007] A powder spray gun nozzle comprises a shell, an electrode holder and a discharge assembly, wherein one end of the electrode holder is connected to the shell, and the other end extends out of the shell, an installation channel is arranged in the electrode holder, and the discharge assembly comprises an electrode needle and a conductive ring, the electrode needle is arranged in the installation channel, the electrode needle is arranged along the length direction of the installation channel and extends out of the installation channel, the conductive ring is connected to the shell, a power-on port is opened on the shell, the power-on port is connected to the installation channel, and the electrode needle can be connected to the conductive ring through the power-on port.

[0008] Preferably, the shell includes a connecting head and a cover shell, the cover shell is sleeved on the outside of the connecting head, the connecting head is set with openings at both ends, and a powder channel that penetrates the openings is provided in the connecting head, one end of the electrode seat extends into the powder channel and is connected to the connecting head, and the other end extends out of the connecting head.

[0009] Preferably, the cover shell includes an inner ring, an outer ring and a reinforcing plate, one end of the reinforcing plate is connected to the inner ring, and the other end extends along the radial direction of the inner ring and is connected to the outer ring; the inner ring is sleeved on the outside of the connecting head, and the inner wall of the inner ring is connected to the outer wall of the connecting head; there are multiple reinforcing plates, and the multiple reinforcing plates are arranged at intervals.

[0010] Preferably, a mounting groove is formed between the inner ring and the outer ring, and the conductive ring is located in the mounting groove; the power-on port is provided on the reinforcing plate, and the electrode needle is electrically connected to the conductive ring through the power-on port.

[0011] Preferably, a groove is provided on the side of the conductive ring facing the mounting groove, the groove is arranged along the circumferential direction of the conductive ring, and at least one air hole penetrating the conductive ring is provided on the groove, so that when the conductive ring is located in the mounting groove, the mounting channel is connected to the groove and the air hole.

[0012] Preferably, an air flow channel connected to the mounting channel is provided in the electrode holder, and a vent connected to the groove is also provided on the reinforcing plate, and the mounting channel is connected to the groove via the air flow channel and the vent in sequence.

[0013] Preferably, the discharge assembly further comprises a current-limiting resistor, which is disposed in the installation channel and is electrically connected to the electrode needle; there are at least two current-limiting resistors, which are connected in series.

[0014] Preferably, it also includes an electrode sleeve, one end of which is connected to the electrode seat, and the other end is extended along the axial direction of the electrode seat, a cavity connected to the mounting channel is provided in the electrode sleeve, and a discharge port connected to the cavity is provided on the end of the electrode sleeve away from the electrode seat, and one end of the electrode needle extends out of the discharge port.

[0015] Preferably, the electrode sleeve and the electrode holder are integrally arranged, or the electrode sleeve and the electrode holder are detachably connected; a limiting boss is further arranged on the outer wall of the electrode sleeve, and the limiting boss is arranged around the electrode sleeve.

[0016] A spray gun comprises a spray gun body and a powder spray gun nozzle as described in any one of the above embodiments, wherein a conductive contact protruding outward is provided on the side of the spray gun body facing the nozzle, and the position of the conductive contact corresponds to the conductive ring. When the nozzle is installed on the spray gun body, the conductive contact abuts against the conductive ring.

[0017] The beneficial effects of the utility model are mainly reflected in: the powder spray gun nozzle and spray gun provided by the utility model have the beneficial effects of simple structure and convenient operation; the conductive mode of the electrode needle is optimized, and it is no longer necessary to power on through a complex circuit arrangement, which facilitates the maintenance and inspection work of the operator. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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.

[0019] Figure 1 This is a schematic diagram of the first shape structure of the nozzle in the utility model;

[0020] Figure 2 This is a schematic diagram of the cross-sectional structure of the first shape of the nozzle in the utility model;

[0021] Figure 3 This is a schematic diagram of the structure of the nozzle in the utility model from the first perspective (excluding the conductive ring);

[0022] Figure 4 It is a structural schematic diagram of the conductive ring in the utility model;

[0023] Figure 5 This is a schematic diagram of the explosion structure of the first shape of the nozzle in the utility model;

[0024] Figure 6 This is a schematic diagram of the second shape structure of the nozzle in the utility model;

[0025] Figure 7 This is a schematic diagram of the cross-sectional structure of the second shape of the nozzle in the utility model;

[0026] Figure 8 This is a schematic diagram of the third shape structure of the nozzle in the utility model;

[0027] Fig. 9 This is a schematic cross-sectional structure diagram of the third shape of the nozzle in the utility model;

[0028] In the figure: shell 1, connector 10, powder channel 101, cover 11, inner ring 110, outer ring 111, reinforcing plate 112, mounting groove 113, power port 114, vent 115, electrode holder 2, mounting channel 20, air flow channel 21, electrode needle 3, conductive ring 4, groove 40, vent 41, current limiting resistor 5, electrode sleeve 6, cavity 60, discharge port 61, limiting boss 62. DETAILED DESCRIPTION

[0029] 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.

[0030] It should be noted that when an element is considered to be "connected" to another element, it may be directly connected to another element and integrated therewith, or there may be an intermediate element at the same time. The terms "installed", "one end", "the other end" and similar expressions used herein are for illustrative purposes only.

[0031] 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.

[0032] refer to Figure 1-9 The utility model provides a powder spray gun nozzle, including a shell 1, an electrode holder 2 and a discharge assembly, wherein one end of the electrode holder 2 is connected to the shell 1, and the other end extends out of the shell 1, a mounting channel 20 is arranged in the electrode holder 2, and the discharge assembly includes an electrode needle 3 and a conductive ring 4 (the conductive ring is mainly made of PP plastic plus carbon black, and the carbon black is conductive, so it can conduct current to the electrode needle), the electrode needle 3 is arranged in the mounting channel 20, the electrode needle 3 is arranged along the length direction of the mounting channel 20, and extends out of the mounting channel 20, the conductive ring 4 is connected to the shell 1, and a power-on port 114 is opened on the shell 1, the power-on port 114 is connected to the mounting channel 20, and the electrode needle 3 can be connected to the conductive ring 4 through the power-on port 114.

[0033] The powder spray gun nozzle provided by the utility model, when in use, connects the shell 1 with the gun head of the electrostatic spray gun, at which time the current on the electrostatic spray gun is transmitted to the conductive ring 4 through the contact, and the electrode needle 3 is connected to the conductive ring 4 through the power port 114, and the current is transmitted to the electrode needle 3 through the conductive ring 4, so that the electrode needle 3 is discharged, and a negative charge is formed around it; and as the powder in the spray gun is sprayed out, these powders are accompanied by charges, forming charged powders, which are adsorbed on the surface of the workpiece to complete the spraying work. Compared with the previous spray gun nozzles, the powder spray gun nozzle provided in this embodiment has the following beneficial effects:

[0034] By arranging the conductive ring 4 on the shell 1, the power supply method of the electrode needle 3 is simplified and convenient. It is no longer necessary to arrange complicated wiring in the electrode holder 2 / shell 1 to power the electrode as in the past. Instead, the conductive ring 4 is used to power the electrode needle 3, and the conductive ring 4 can be a conductive plastic ring. On the one hand, the cost is relatively low, and on the other hand, it can ensure that it has a good conductive effect; the overall structure is simpler, and the operator is more convenient to use, and the conductive ring 4 and the shell 1 can be detachably connected, which is also convenient for later maintenance personnel to carry out maintenance work.

[0035] refer to Figure 1 and 2 In a preferred embodiment, the shell 1 includes a connector 10 and a cover 11. The cover 11 is sleeved on the outside of the connector 10. The connector 10 is opened at both ends, and a powder channel 101 that is connected to the opening is provided in the connector 10. One end of the electrode holder 2 extends into the powder channel 101 and is connected to the connector 10, and the other end extends out of the connector 10.

[0036] Specifically, when in use, by inserting the rear end of the connector 10 into the gun head of the spray gun (refer to Figure 5 , from the first perspective, the rear end referred to here is the right end in the figure), the powder channel 101 of the connector 10 is connected to the powder outlet of the spray gun, and the electrode holder 2 is located at the front end of the connector 10, that is, the electrode needle 3 discharges at the front end of the connector 10, and at the same time, the powder is sprayed out at the front end of the connector 10 through the powder channel 101, so that the powder absorbs the charge while being sprayed to form charged powder.

[0037] refer to Figure 3 and 5In a preferred embodiment, the housing 11 includes an inner ring 110, an outer ring 111 and a reinforcing plate 112. One end of the reinforcing plate 112 is connected to the inner ring 110, and the other end extends along the radial direction of the inner ring 110 and is connected to the outer ring 111. The inner ring 110 is sleeved on the outer side of the connector 10, and the inner wall of the inner ring 110 is connected to the outer wall of the connector 10. There are multiple reinforcing plates 112, and the multiple reinforcing plates 112 are arranged at intervals. In this embodiment, the inner ring 110 and the outer ring 111 are connected by multiple reinforcing plates 112, which can make the overall stability of the housing 11 better and not easy to be damaged. In a further preferred embodiment, the housing 11 and the connector 10 can be integrally formed, which can also further improve the stability of the housing 1.

[0038] refer to Figure 3 and 5 In a preferred embodiment, a mounting groove 113 is formed between the inner ring 110 and the outer ring 111, and the conductive ring 4 is located in the mounting groove 113; a power port 114 is provided on the reinforcing plate 112, and the electrode needle 3 is electrically connected to the conductive ring 4 through the power port 114. When the connector 10 is connected to the spray gun, the contact on the spray gun head contacts the conductive ring 4, so that the current can be conducted to the conductive ring 4, and one end of the electrode needle 3 extends out of the power port 114 to connect to the conductive ring 4, so that the current of the conductive ring 4 can be smoothly conducted to the electrode needle 3.

[0039] refer to Figure 4 In a preferred embodiment, a groove 40 is provided on the side of the conductive ring 4 facing the mounting groove 113. The groove 40 is arranged along the circumferential direction of the conductive ring 4. The groove 40 is provided with at least one vent hole 41 penetrating the conductive ring 4 (the penetration referred to here means penetrating up and down along the thickness direction of the conductive ring 4). When the conductive ring 4 is located in the mounting groove 113, the mounting channel 20 is connected to the groove 40 and the vent hole 41.

[0040] refer to Figure 2 , 7 9. In a further preferred embodiment, an air flow channel 21 connected to the mounting channel 20 is provided in the electrode holder 2, and a vent 115 connected to the groove 40 is also provided on the reinforcing plate 112. The mounting channel 20 is connected to the groove 40 via the air flow channel 21 and the vent 115 in sequence.

[0041] When the nozzle is connected to the spray gun, the gas supply mechanism on the spray gun will also blow air toward the powder outlet, and the gas blown out can enter the groove 40 through the vent 41; then flow to the air flow channel 21 through the vent 115, and finally blow out to the outside through the installation channel 20. The air flow channel 21 is set in the electrode holder 2 to play a role in clearing and blowing. Specifically, when the electrode needle 3 discharges, there will be some powder attached to the electrode holder 2. At this time, the powder attached to it can be blown away by the air flow to avoid the accumulation of powder at the discharge position of the electrode needle 3, which affects the discharge effect.

[0042] refer to Figure 2 , 7 9. In a preferred embodiment, the discharge assembly further includes a current limiting resistor 5, which is disposed in the installation channel 20 and is electrically connected to the electrode needle 3; there are at least two current limiting resistors 5, which are connected in series.

[0043] During the use of the powder spraying equipment, a voltage doubling circuit is provided in the spray gun for pressurizing the electrode needle 3, so that the low voltage (12V) is converted into a high voltage of 110kV, so that a discharge can be formed at the end of the electrode needle 3 during operation. Under such working conditions, the electrode needle 3 often has a large current. Therefore, by setting a resistor, the current can be reduced to avoid the electrode needle 3 from generating sparks at the discharge tip; reduce the degree of danger; the use of two or more resistors can make the current limiting effect better on the one hand, and on the other hand, it will not make the volume of the electrode holder 2 too large; for example, in order to achieve a current limiting effect of 30MΩ, if a 30MΩ resistor is directly used, the volume of the resistor will inevitably be larger as a whole, resulting in more space occupied, and the volume of the electrode holder 2 will also increase accordingly; and by using two 15MΩ resistors in series, the volume of the resistor can be reduced and the space occupied is also less.

[0044] refer to Figure 1 , 6 8. In a preferred embodiment, it further comprises an electrode sleeve 6, one end of which is connected to the electrode holder 2, and the other end of which is extended along the axial direction of the electrode holder 2. A cavity 60 communicating with the mounting channel 20 is provided in the electrode sleeve 6. A discharge port 61 communicating with the cavity 60 is provided at one end of the electrode sleeve 6 away from the electrode holder 2, and one end of the electrode needle 3 extends out of the discharge port 61. The electrode sleeve 6 can mainly protect the electrode needle 3, and also prevent powder from accumulating at the discharge position of the electrode needle 3; refer to Figure 1 , Figure 6 and Figure 8 There is no specific limitation on the shape of the electrode sleeve 6 as long as it can achieve the above functions.

[0045] refer to Figure 1 , 6 8. In a preferred embodiment, the electrode sleeve 6 and the electrode holder 2 are integrally arranged (eg Figure 1 The electrode sleeve 6 and the electrode holder 2 are detachably connected ( Figure 6 , 8 The outer wall of the electrode sleeve 6 is also provided with a limit boss 62, which is arranged around the electrode sleeve 6. The electrode sleeve 6 and the electrode holder 2 are arranged in an integrated manner, which is more suitable for fixed use scenarios; and according to different use scenarios, when necessary, the electrode sleeve 6 and the electrode holder 2 can also be connected in a detachable manner so that the electrode sleeve 6 can be replaced at any time.

[0046] A spray gun comprises a spray gun body (not shown) and a powder spray gun nozzle as in any one of the preferred embodiments described above. A conductive contact protruding outward is provided on the side of the spray gun body facing the nozzle. The position of the conductive contact corresponds to a conductive ring 4. When the nozzle is installed on the spray gun body, the conductive contact abuts against the conductive ring 4.

[0047] The specific working process of the powder spray gun nozzle and the spray gun provided by the utility model is as follows:

[0048] By inserting the connector 10 of the spray head into the spray gun body, the conductive contacts of the spray gun body are in contact with the conductive ring 4, and the current is transmitted to the conductive ring 4. The conductive ring 4 is also connected to the electrode needle 3. At this time, the current will be transmitted to the electrode needle 3 through the conductive ring 4, so that the tip of the electrode needle 3 generates discharge; at the same time, the spray gun body is provided with a gas supply mechanism, and the gas blown by the gas supply mechanism enters the groove 40 of the conductive ring 4 through the air vent 41, and then blows into the air flow channel 21 through the air vent 115, and finally blows out from the installation channel 20 to the outside, thereby blowing away the powder attached to the electrode needle 3, effectively avoiding powder accumulation.

[0049] The powder spray gun nozzle and spray gun provided by the utility model have the beneficial effects of simple structure and convenient operation; the conductive mode of the electrode needle 3 is optimized, and it is no longer necessary to energize through a complex circuit arrangement, which facilitates the maintenance and inspection work of the operator.

[0050] 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 this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A powder spray gun nozzle, characterized in that: It includes a shell, an electrode seat and a discharge assembly, wherein one end of the electrode seat is connected to the shell, and the other end extends out of the shell, an installation channel is arranged in the electrode seat, and the discharge assembly includes an electrode needle and a conductive ring, the electrode needle is arranged in the installation channel, the electrode needle is arranged along the length direction of the installation channel and extends out of the installation channel, the conductive ring is connected to the shell, a power-on port is opened on the shell, the power-on port is connected to the installation channel, and the electrode needle can be connected to the conductive ring through the power-on port.

2. The powder spray gun nozzle according to claim 1, characterized in that: The shell includes a connecting head and a cover shell, the cover shell is sleeved on the outside of the connecting head, the connecting head is set with openings at both ends, and a powder channel that penetrates the openings is provided in the connecting head, one end of the electrode seat extends into the powder channel and is connected to the connecting head, and the other end extends out of the connecting head.

3. The powder spray gun nozzle according to claim 2, characterized in that: The cover shell includes an inner ring, an outer ring and a reinforcing plate, one end of the reinforcing plate is connected to the inner ring, and the other end extends along the radial direction of the inner ring and is connected to the outer ring; the inner ring is sleeved on the outside of the connecting head, and the inner wall of the inner ring is connected to the outer wall of the connecting head; there are multiple reinforcing plates, and the multiple reinforcing plates are arranged at intervals.

4. The powder spray gun nozzle according to claim 3, characterized in that: An installation groove is formed between the inner ring and the outer ring, and the conductive ring is located in the installation groove; the power-on port is arranged on the reinforcing plate, and the electrode needle is electrically connected to the conductive ring through the power-on port.

5. The powder spray gun nozzle according to claim 4, characterized in that: A groove is provided on the side of the conductive ring facing the mounting groove, and the groove is arranged along the circumferential direction of the conductive ring. The groove is provided with at least one vent hole penetrating the conductive ring. When the conductive ring is located in the mounting groove, the mounting channel is connected to the groove and the vent hole.

6. The powder spray gun nozzle according to claim 5, characterized in that: The electrode holder is provided with an air flow channel connected with the mounting channel, the reinforcing plate is also provided with an air vent connected with the groove, and the mounting channel is connected with the groove through the air flow channel and the air vent in sequence.

7. The powder spray gun nozzle according to claim 1, characterized in that: The discharge assembly further includes a current-limiting resistor, which is disposed in the installation channel and is electrically connected to the electrode needle; there are at least two current-limiting resistors, which are connected in series.

8. The powder spray gun nozzle according to claim 1, characterized in that: It also includes an electrode sleeve, one end of which is connected to the electrode seat, and the other end is extended along the axial direction of the electrode seat, a cavity connected to the installation channel is provided in the electrode sleeve, and a discharge port connected to the cavity is provided on the end of the electrode sleeve away from the electrode seat, and one end of the electrode needle extends out of the discharge port.

9. The powder spray gun nozzle according to claim 8, characterized in that: The electrode sleeve and the electrode holder are integrally arranged, or the electrode sleeve and the electrode holder are detachably connected; a limiting boss is also arranged on the outer wall of the electrode sleeve, and the limiting boss is arranged around the electrode sleeve.

10. A spray gun, characterized in that: It comprises a spray gun body and a powder spray gun nozzle as described in any one of claims 1 to 9, wherein a conductive contact protruding outward is provided on a side of the spray gun body facing the nozzle, and the position of the conductive contact corresponds to the conductive ring, and when the nozzle is installed on the spray gun body, the conductive contact abuts against the conductive ring.

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