CN113304903B

CN113304903B - Multifunctional electrostatic powder spraying device

Info

Publication number: CN113304903B
Application number: CN202110860843.9A
Authority: CN
Inventors: 黄观强
Original assignee: Foshan Yuechungang Electromechanical Equipment Engineering Co ltd
Current assignee: Foshan Yuechungang Electromechanical Equipment Engineering Co ltd
Priority date: 2021-07-29
Filing date: 2021-07-29
Publication date: 2021-09-21
Anticipated expiration: 2041-07-29
Also published as: CN113304903A

Abstract

The invention relates to the technical field of injection equipment, and discloses a multifunctional electrostatic powder injection device which comprises a spray head cavity, wherein a pressurizing rotary cavity and an electrostatic spraying cavity are arranged in the spray head cavity, the pressurizing rotary cavity is communicated with the electrostatic spraying cavity through a flow guide channel, a spiral flow guide mechanism for spirally guiding powder into the flow guide channel is arranged in the pressurizing rotary cavity, a reverse flow inhibition mechanism is arranged in the flow guide channel, a discharge basin is suspended on the inner wall of the electrostatic spraying cavity through a basin support pipe, the opening of the discharge basin faces the tail part and faces the front opening of the flow guide plate, and a discharge needle is positioned at the axial lead position of the discharge basin; according to the invention, the direction of the powder flowing in the spray head cavity is changed, the powder passes through the discharge needles in a spiral surrounding manner, meanwhile, a novel structure of the discharge basin is additionally arranged, so that no dead angle is attached, the uniform attachment of charges to the powder is realized, the thickness of a spraying layer is more uniform and consistent, the internal flow direction and the mute link of the powder are optimized, and the durability and the environmental adaptability of the spray head are ensured.

Description

Multifunctional electrostatic powder spraying device

Technical Field

The invention particularly relates to an electrostatic spray head, in particular to a multifunctional electrostatic powder spraying device.

Background

The electrostatic powder spray method works almost exactly the same as the electrostatic spray method of a general liquid coating, except that the powder spray is dispersed, not atomized. It is made up by using coating material sprayed from electrostatic powder spray gun, at the same time of dispersing the powder particles, making the powder particles be negatively charged, and coating the charged powder particles on the grounded object to be coated by the action of air flow (or centrifugal force or other acting force) and electrostatic attraction force, then heating, melting and solidifying so as to obtain the invented film. Electrostatic powder spraying is a powder coating method that is dominant in the industrial coating field.

Wherein electrostatic powder spray gun relies on inside discharge to carry out the attached negative charge to the powder that passes through, when the powder throughput is big, the unable even attached negative charge of a lot of powder in time, powder electric charge quantity difference obviously can lead to the electrostatic absorption effect, and the problem that finally shows on the spraying face is uneven in thickness, consequently, to this type of problem, we need one kind can guarantee that large-traffic powder passes through in the electrostatic powder spray gun, can be even effectual all attached negative charge to guarantee the injection apparatus of the unanimous homogeneity of spraying face.

Disclosure of Invention

The present invention is directed to a multifunctional electrostatic powder spraying device to solve the above problems.

In order to achieve the purpose, the invention provides the following technical scheme:

a multifunctional electrostatic powder spraying device comprises a spray head cavity, wherein a powder spraying port for spraying electrostatic powder outwards and a powder interface for being in sealing connection with an external powder supply end are respectively formed in the head end and the tail end of the spray head cavity, a discharge needle for discharging to attach negative charges to the powder is arranged in the spray head cavity, a pressurizing rotary cavity and an electrostatic spraying cavity are arranged in the spray head cavity, the tail end of the pressurizing rotary cavity is communicated with the powder interface, the front end of the pressurizing rotary cavity is communicated with the tail end of the electrostatic spraying cavity through a flow guide channel, the powder spraying port is formed in the front end of the electrostatic spraying cavity, a spiral flow guide mechanism for guiding the powder into the flow guide channel is arranged in the pressurizing rotary cavity, the discharge needle penetrates through the electrostatic spraying cavity and the flow guide channel along the head-tail direction, a reverse flow inhibition mechanism is arranged in the flow guide channel, and a discharge basin is suspended on the spraying inner wall of the electrostatic cavity through a basin support tube, the discharge basin and the discharge needle are connected with a high-voltage electrostatic generator externally and discharge in the spray head cavity together, the opening of the discharge basin faces the tail part and faces the front opening of the guide plate, the discharge needle is located at the axial lead position of the discharge basin, and an escape channel for discharging powder facing the powder spraying port is reserved between the edge of the opening of the discharge basin and the inner wall of the electrostatic spraying cavity.

Further scheme: the spiral flow guide mechanism comprises a spiral downward rotary plate fixed on the inner wall of the pressurizing rotary cavity, the rotary plate divides the inside of the pressurizing rotary cavity into a spiral downward spiral channel in the pressurizing rotary cavity, and the bottom opening of the spiral channel is obliquely downward opposite to the tail opening of the flow guide channel.

Further scheme: the pressurizing rotary cavity is of a funnel shape with a big tail part and a small front part of the whole layer.

Further scheme: the backflow inhibiting mechanism comprises a guide plate fixed on the periphery of the inner wall of an opening at the front end of the flow guide channel, and the guide plate is an elastic sheet bent towards the direction of the inner part of the electrostatic spraying cavity.

Further scheme: the multi-layer guide plates are arranged in the axis direction of the guide channel and spirally distributed on the inner wall of the guide channel downwards.

Further scheme: the electrostatic spraying cavity is a funnel-like cavity body with the axial lead and the cross section in the direction of the axial lead in a heart shape.

Further scheme: and an opening at the outer part of the powder spraying port is provided with an air guide head for guiding the air outlet angle of the powder to be vertical to the front end surface of the spray head cavity.

Further scheme: the inside wind-guiding passageway that runs through is seted up along the head and the tail direction of shower nozzle cavity to the wind-guiding head, and the wind-guiding passageway middle part inner wall left and right sides is equipped with hemispherical regulation wind channel chamber.

Compared with the prior art, the invention has the beneficial effects that: according to the invention, the direction of the powder flowing in the spray head cavity is changed, the powder passes through the discharge needles in a spiral surrounding manner, meanwhile, a novel structure of the discharge basin is additionally arranged, so that dead-corner-free adhesion is ensured, uniform adhesion of charges to the powder is realized, the sufficient and thorough adhesion of charges to the powder is ensured through the structure of the traditional discharge end, the uniform electrification of the powder is ensured, the thickness of a spraying layer is more uniform and consistent, the internal flow direction and the mute link of the powder are optimized, and the durability and the environmental adaptability of the spray head are ensured.

Drawings

Fig. 1 is a schematic structural view of an electrostatic powder multifunctional spraying device.

Fig. 2 is a schematic diagram of the structure of a discharge needle and a discharge basin in the electrostatic powder multifunctional spraying device and a schematic diagram of the flow direction of powder.

Fig. 3 is a schematic structural diagram of a flow guide plate in the multifunctional electrostatic powder spraying device.

Fig. 4 is a schematic view of a multifunctional electrostatic powder spraying device with an additional air guide head and a schematic view of the powder flow direction inside a spray head cavity.

Fig. 5 is a schematic structural view of a wind guide head in the multifunctional electrostatic powder spraying device.

In the figure: the device comprises a spray head cavity 1, a powder interface 10, a powder spraying port 11, a pressurizing convolution cavity 12, a flow guide channel 13, an electrostatic spraying cavity 14, a convolution plate 2, a flow guide plate 3, a discharge needle 4, a discharge basin 5, a basin support tube 50, a wind guide head 6, a wind guide channel 60 and an adjusting air channel cavity 61.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

Referring to fig. 1 to 3, in the embodiment of the present invention, a multifunctional electrostatic powder spraying device includes a nozzle cavity 1, a powder spraying port 11 for spraying electrostatic powder to the outside and a powder interface 10 for sealing connection with an external powder supply end are respectively disposed at the head end and the tail end of the nozzle cavity 1, a discharge needle 4 for discharging negative charges attached to the powder is disposed inside the nozzle cavity 1, a pressure-increasing swirl cavity 12 and an electrostatic spraying cavity 14 are disposed inside the nozzle cavity 1, the tail end of the pressure-increasing swirl cavity 12 is communicated with the powder interface 10, the front end of the pressure-increasing swirl cavity 12 is communicated with the tail end of the electrostatic spraying cavity 14 through a flow guide channel 13, the powder spraying port 11 is disposed at the front end of the electrostatic spraying cavity 14, a spiral flow guide mechanism for spirally guiding the powder into the flow guide channel 13 is disposed inside the pressure-increasing swirl cavity 12, the discharge needle 4 penetrates through the electrostatic spraying cavity 14 and the flow guide channel 13 along the head-tail direction, a reverse flow inhibiting mechanism is arranged in the flow guide channel 13, a discharge basin 5 is suspended on the inner wall of the electrostatic spraying cavity 14 through a basin support tube 50, the discharge basin 5 and the discharge needle 4 are externally connected with a high-voltage electrostatic generator and discharge in the spray head cavity 1 together, the opening of the discharge basin 5 faces the tail part and faces the front opening of the guide plate 3, the discharge needle 4 is located at the axial lead position of the discharge basin 5, and an escape channel for discharging powder facing the powder spraying port 11 is reserved between the opening edge of the discharge basin 5 and the inner wall of the electrostatic spraying cavity 14.

The spiral flow guide mechanism comprises a spiral downward rotary plate 2 fixed on the inner wall of a pressurizing rotary cavity 12, the rotary plate 2 divides the inside of the pressurizing rotary cavity 12 into spiral downward spiral passages in the pressurizing rotary cavity 12, the bottom openings of the spiral passages are downward and obliquely opposite to the tail opening positions of the flow guide passages 13, the arranged spiral passages are mainly used for guiding powder into the flow guide passages 13 with built-in discharge needles 4 in a spiral discharging mode, then the powder rotates downward around the discharge needles 4, the negative charges discharged by the discharge needles 4 can be fully attached, and compared with the traditional straight-through type, the mode can improve the uniformity and effectiveness of the powder attached negative charges, and the problem that the powder far away from the discharge needles 4 cannot be fully attached to the negative charges is reduced.

The pressurization cavity 12 that circles round is the big anterior little funnel type of monolithic afterbody, and this kind of appearance can improve the discharge velocity of powder in pressurization cavity 12 front end ejection of compact department of circling round, prevents on the one hand that once only get into the inside powder of water conservancy diversion passageway 13 and excessively can't all have the attached to negative charge problem, and on the other hand is because water conservancy diversion passageway 13 has certain depth, improves discharge velocity, guarantees this kind of rotation state of powder.

Palirrhea suppression mechanism is including fixing guide plate 3 around the opening inner wall of water conservancy diversion passageway 13 front end, guide plate 3 is the crooked shell fragment of 14 inside directions in the chamber of spouting towards static, and the guide plate 3 that sets up mainly prevents that the interior powder of static blowout chamber 14 from reversely gushing into in the water conservancy diversion passageway 13 under the prerequisite that does not influence the inside powder of water conservancy diversion passageway 13 and get into towards static blowout chamber 14.

The multilayer guide plates 3 are arranged in the axis direction of the guide channel 13, the multilayer guide plates 3 are spirally distributed on the inner wall of the guide channel 13 downwards, and the spiral layered distribution of the guide plates 3 mainly conforms to the effect of a spiral guide mechanism in the pressurizing convolution cavity 12, so that spiral powder is ensured not to be blocked by the guide plates 3 and continuously flows towards the electrostatic spraying cavity 14 around the discharge needle 4 along the spiral direction.

The electrostatic spraying cavity 14 is a funnel-like cavity with a heart-shaped axial line section, the cavity with the heart-shaped section is mainly characterized in that after powder is flushed out from the discharge basin 5 to the periphery, the heart-shaped arc surface at the top in the electrostatic spraying cavity 14 can play a role in buffering and guiding the flow of the powder, escape channels are arc-shaped channels which are bent downwards instead of simple funnel-shaped direct impact, the powder can be smoothly discharged from the powder spraying port 11 along the arc surface of the inner cavity of the electrostatic spraying cavity 14, the smoothness of powder discharge is ensured on one hand, and on the other hand, the noise of the whole spray head cavity 1 during powder blowing is also reduced.

The working principle of the invention is as follows: when the powder spraying device is used, powder enters the pressurizing convolution cavity 12 from the powder interface 10 and is firstly subjected to spiral acceleration to change the wind direction in the vertical direction into a spiral wind direction to be led into the flow guide channel 13, the spirally flowing powder is subjected to charge adhesion around the discharging discharge needle 4 in the flow guide channel 13, in order to further ensure that the peripheral powder completely removes a discharging end, the discharging basin 5 which also generates the charge is directly blocked on the path of the flowing powder, the powder is fully adhered to the charge in the collision discharging basin 5, and after the powder is sprayed from the discharging basin 5, the powder flows to the powder spraying port 11 along the inner wall of the electrostatic spraying cavity 14 and is finally discharged from the powder spraying port 11 to finish the process of the powder adhesion of the charge, and the full and thorough adhesion of the charge of the powder is ensured by changing the wind direction and the structure of the traditional discharging end.

Example 2

Referring to fig. 4 and 5, the present embodiment is different from embodiment 1 in that:

the opening part outside the powder spraying port 11 is provided with a wind guide head 6 used for guiding the air outlet angle of powder to be vertical to the front end face of the sprayer cavity 1, and the arranged wind guide head 6 is mainly used for leading the powder sprayed from the electrostatic spraying cavity 14 to converge from the inner walls of the left side and the right side of the electrostatic spraying cavity 14 when the powder is sprayed out from the electrostatic spraying cavity 14, so that the powder sprayed from the powder spraying port 11 can be branched or disturbed at the position of the powder spraying port 11, and the wind guide head 6 is additionally arranged for pertinently adjusting the powder spraying angle of the air outlet of the powder spraying port 11.

The inside wind-guiding passageway 60 that has seted up the run-through along the head and the tail direction of shower nozzle cavity 1 of wind-guiding head 6, the wind-guiding passageway 60 middle part inner wall left and right sides is equipped with hemispherical regulation wind channel chamber 61, and the vertical blowout of the powder backspin that wind-guiding passageway 60 was spout into in slope is mainly carried out to the regulation wind channel chamber 61 that sets up.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. A multifunctional electrostatic powder spraying device comprises a spray head cavity (1), wherein a powder spraying port (11) for spraying electrostatic powder to the outside and a powder interface (10) for being hermetically connected with an external powder supply end are respectively formed in the head end and the tail end of the spray head cavity (1), and a discharge needle (4) for discharging and attaching negative charges to the powder is arranged in the spray head cavity (1); the method is characterized in that: the spray head comprises a spray head cavity body (1), wherein a pressurizing rotary cavity (12) and an electrostatic spraying cavity (14) are arranged in the spray head cavity body (1), the tail end of the pressurizing rotary cavity (12) is communicated with a powder connector (10), the front end of the pressurizing rotary cavity (12) is communicated with the tail end of the electrostatic spraying cavity (14) through a flow guide channel (13), a powder spraying port (11) is formed in the front end of the electrostatic spraying cavity (14), a spiral flow guide mechanism for spirally guiding powder into the flow guide channel (13) is arranged in the pressurizing rotary cavity (12), a discharge needle (4) penetrates through the electrostatic spraying cavity (14) and the flow guide channel (13) along the head-to-tail direction, a reverse flow inhibition mechanism is arranged in the flow guide channel (13), the reverse flow inhibition mechanism comprises flow guide plates (3) fixed on the periphery of the inner wall of an opening in the front end of the flow guide channel (13), and a discharge basin (5) is suspended on the inner wall of the electrostatic spraying cavity (14) through a support basin pipe (50), the discharge basin (5) and the discharge needle (4) are connected with a high-voltage electrostatic generator externally and discharge in the spray head cavity (1) together, the opening of the discharge basin (5) faces the tail of the electrostatic spraying cavity (14) and faces the opening at the front end of the flow guide channel (13), the discharge needle (4) is located at the axial lead position of the discharge basin (5), and an escape channel for discharging powder towards the powder spraying port (11) is reserved between the opening edge of the discharge basin (5) and the inner wall of the electrostatic spraying cavity (14).

2. The electrostatic powder multifunctional spraying device according to claim 1, wherein the spiral flow guide mechanism comprises a spiral downward rotary plate (2) fixed on the inner wall of the pressure-increasing rotary cavity (12), the rotary plate (2) divides the inside of the pressure-increasing rotary cavity (12) into a spiral passage in a spiral downward direction in the pressure-increasing rotary cavity (12), and the bottom opening of the spiral passage faces downward obliquely to the rear opening position of the flow guide passage (13).

3. The electrostatic multifunctional powder spraying device according to claim 2, wherein the pressure-increasing swirl chamber (12) is a funnel shape with a large tail and a small front.

4. The electrostatic powder multifunctional spraying device according to claim 1, characterized in that the deflector (3) is a spring sheet bent towards the inner direction of the electrostatic spraying cavity (14).

5. The electrostatic powder multifunctional spraying device according to claim 4, characterized in that a plurality of layers of flow deflectors (3) are arranged in the axial direction of the flow guiding channel (13), and the plurality of layers of flow deflectors (3) are spirally distributed downwards on the inner wall of the flow guiding channel (13).

6. The electrostatic powder multifunctional spraying device as claimed in claim 1, wherein the electrostatic spraying cavity (14) is a funnel-like cavity body with a center axis cross section direction being heart-shaped.

7. The electrostatic multifunctional powder spraying device as claimed in any one of claims 1 to 6, wherein an opening outside the powder spraying port (11) is provided with a wind guide head (6) for guiding the wind angle of the powder to be perpendicular to the front end surface of the nozzle cavity (1).

8. The multifunctional electrostatic powder spraying device as claimed in claim 7, wherein the air guide head (6) is provided with a penetrating air guide channel (60) along the head-to-tail direction of the nozzle cavity (1), and the air guide channel (60) is provided with hemispherical adjusting air channel cavities (61) on the left and right sides of the inner wall of the middle part thereof.