EP3338899A1

EP3338899A1 - Powder feeding center capable of automatically cleaning

Info

Publication number: EP3338899A1
Application number: EP16836565.8A
Authority: EP
Inventors: Yiyuan YANG
Original assignee: Linqu Yuan Hong Metal Products Co Ltd
Current assignee: Linqu Yuan Hong Metal Products Co Ltd
Priority date: 2015-08-17
Filing date: 2016-08-09
Publication date: 2018-06-27
Anticipated expiration: 2036-08-09
Also published as: WO2017028701A1; CN104984845B; EP3338899B1; CN104984845A; EP3338899A4

Abstract

A powder feeding center capable of automatically cleaning is disclosed. A powder barrel (2) of the powder feeding center is mounted in a pressure maintaining housing (1) in a hanging way, a pressure stabilizing mouth is provided on the top of the pressure maintaining housing (1), and a powder cleaning mouth is provided at the bottom of the pressure maintaining housing (1); both of the top and the bottom of the powder barrel (2) are open, an air intake chamber (20) capable of moving up and down is disposed at the bottom of the powder barrel (2), a fluidization plate (21) is fixedly mounted on the top of the air intake chamber (20), and the air intake chamber (20) is driven by a driving device; an air intake is provided on the air intake chamber (20), and the air intake is connected to an air intake telescopic tube (25); an air intake pipe (26) is fixedly mounted on the pressure maintaining housing (1), the air intake telescopic tube (25) is connected to the air intake pipe (26), and an air intake valve (27) is mounted on the air intake pipe (26); at least one powder outlet is provided on a side wall of the powder barrel (2), and a powder outlet pipe (22) is connected to the powder outlet; and a purging device capable of moving up and down is fixedly mounted on the pressure maintaining housing (1). The air intake chamber is capable of moving up and down along with the purging device, so that a powder outlet gap is formed between the powder barrel and the air intake chamber, thereby achieving automatic cleaning of the powder barrel by means of air purging.

Description

Technology

The present invention relates to an electrostatic powder spraying device, and in particular, to a powder feeding center capable of automatically cleaning.
Electrostatic powder spraying is a metal surface anti-corrosion and decoration process. Compared with a conventional paint coating process, electrostatic powder spraying is suitable for automated production, can attain a high-quality surface coating, and is economical and environmentally friendly. Therefore, electrostatic powder spaying has been widely applied to industrial production.
A powder feeding center is a commonly used device for electrostatic powder spraying, and includes a powder barrel for containing powder. The powder barrel is of a closed cylindrical structure. A powder pipe whose end portion is inserted into the powder barrel is connected to the powder barrel. The powder pipe is connected to a powder suction mouth of a powder pump. A powder outlet of the powder pump is connected to a spray gun. In use, the powder pump sucks the powder from the powder pipe inserted into the powder barrel, and then transmits the powder to the spray gun for spraying. When powder in an existing powder feeding center needs to be changed, the powder barrel needs to be opened for removing and reclaiming residual powder. After being cleaned, the powder barrel is placed back into the powder feeding center for receiving new powder. When there are a large number of spray guns mounted on the powder barrel, the spray guns and powder pipes need to be cleaned one by one. Such a process is complex, time-consuming, and not automated enough. In addition, the ambient environment is easily polluted when the powder barrel is cleaned outside.

Technical Problem

A technical problem to be resolved by the present invention is to provide a powder feeding center capable of quickly cleaning a powder barrel and each powder pipeline.

Solution to the Problem

Technical Solution

To resolve the foregoing technical problem, the present invention includes a powder barrel, and is structurally characterized by further including a pressure maintaining housing, where a pressure detection device is mounted in the pressure maintaining housing, the powder barrel is mounted in the pressure maintaining housing in a hanging way, a feed hopper that can be closed is disposed on the top of the pressure maintaining housing corresponding to the powder barrel, a pressure stabilizing mouth is provided on the top of the pressure maintaining housing, a powder cleaning mouth is provided at the bottom of the pressure maintaining housing, a pressure stabilizing valve is mounted on the pressure stabilizing mouth, and a powder cleaning valve is mounted on the powder cleaning mouth; both of the top and the bottom of the powder barrel are open, an air intake chamber capable of moving up and down in the pressure maintaining housing is disposed at the bottom of the powder barrel, a fluidization plate capable of communicating the air intake chamber with the powder barrel is fixedly mounted on the top of the air intake chamber, the air intake chamber is driven by a driving device mounted on the pressure maintaining housing, and the air intake chamber is capable of closing the bottom of the powder barrel when moving to a highest point; an air intake is provided on the air intake chamber, the air intake is connected to an air intake telescopic tube, an air intake pipe whose end portion protrudes from the pressure maintaining housing is fixedly mounted on the pressure maintaining housing corresponding to the air intake, the air intake telescopic tube is connected to the air intake pipe, and an air intake valve is mounted on the air intake pipe to control opening or closing thereof; at least one powder outlet is provided on a side wall of the powder barrel, and a powder outlet pipe whose end portion protrudes from the pressure maintaining housing is connected to the powder outlet; and a purging device capable of moving up and down and used for purging an inner cavity of the powder barrel is fixedly mounted on the pressure maintaining housing.
The pressure stabilizing valve is a three-way valve, where one port is connected to a communicating pipe, and the communicating pipe is in communication with the air intake pipe.
A top wall of the pressure maintaining housing is horizontally disposed, any longitudinal section of a bottom wall of the pressure maintaining housing is arc-shaped, and the powder cleaning mouth is provided at a lowest point on the bottom wall.
A powder discharging mouth is provided at the bottom of the side wall of the powder barrel, the powder discharging mouth is connected to a powder discharging pipe whose end portion protrudes from the pressure maintaining housing, and a powder discharging valve is disposed on the powder discharging pipe to control opening or closing thereof.
The purging device includes a driving cylinder fixedly mounted on the top of the pressure maintaining housing, a piston rod of the driving cylinder extends downward into the pressure maintaining housing, a purging chamber capable of moving up and down in the powder barrel when driven by the driving cylinder is fixedly mounted on an end portion of the piston rod, a plurality of purging holes is provided on a bottom wall of the purging chamber, an air inlet is provided on a top wall of the purging chamber, the air inlet is connected to an air inlet telescopic tube, the air inlet telescopic tube is connected to an air inlet pipe fixedly mounted on the top of the pressure maintaining housing, and an air inlet valve is mounted on the air inlet pipe to control opening or closing thereof.
The air intake valve, the powder cleaning valve, the air inlet valve, and the pressure stabilizing valve are all solenoid valves, and a control end of each of the valves is electrically connected to a control circuit; and the pressure detection device is a pressure sensor, and a signal output end of the pressure detection device is electrically connected to the control circuit.
The purging chamber is ring-shaped, and an inner surface of the purging chamber is connected to the piston rod of the driving cylinder by using a connecting rod; and the plurality of purging holes is provided on the bottom wall of the purging chamber, the plurality of purging holes is arranged in a ring shape, and each purging hole is obliquely provided toward a same direction.
The driving device includes a primary cylinder fixedly mounted on the pressure maintaining housing; and an outer diameter of the air intake chamber is greater than an outer diameter of the powder barrel, at least one pull rod extending upward is fixedly mounted on an outer edge of a top wall of the air intake chamber, and the top end of the pull rod is connected to a piston rod of the primary cylinder.
The driving device includes the driving cylinder and the purging chamber, the outer diameter of the air intake chamber is greater than the outer diameter of the powder barrel, the at least one pull rod extending upward is fixedly mounted on the outer edge of the top wall of the air intake chamber, a compression rod extending inward horizontally is fixedly mounted at the top end of the pull rod, an end portion of the compression rod can press against an upper surface of the purging chamber, and a stroke of the driving cylinder can ensure that the fluidization plate of the air intake chamber can close the bottom of the powder barrel when the purging chamber is at a highest point; and the length of the pull rod is greater than the height of the powder barrel.
A support rod extending outward horizontally is fixedly mounted on an outer surface of the powder barrel, a limiting ring for limiting the pull rod is fixedly mounted on an end portion of the support rod, and the pull rod passes through the limiting ring.

Beneficial Effects of the Invention

Beneficial Effects

By using the foregoing structure, in the present invention, the powder barrel is mounted in the pressure maintaining housing in a hanging way, so that a pressure stabilizing cavity is formed between the pressure maintaining housing and the powder barrel. The air intake chamber, the air intake valve, and the pressure stabilizing valve are disposed, so that a pressure stabilizing space can be formed between the pressure maintaining housing and the powder barrel while air is let in for fluidizing powder. Pressure in the pressure maintaining housing is maintained at a specified value by opening and closing the pressure stabilizing valve. The opening of the air inlet valve is adjusted to adjust the amount of the air let in, so that the effect of powder fluidization and the speed of powder outlet are adjusted. In the present invention, because the pressure in the pressure maintaining housing is maintained at the specified value, constant-pressure powder feeding by the powder barrel is implemented. In addition, because the powder is fluidized by letting in air and is let out by pressurization, powder content per unit volume during powder outlet is increased. In the present invention, the purging chamber capable of moving up and down is disposed, and the air intake chamber is capable of moving up and down along with the purging chamber, so that the powder outlet gap is formed between the powder barrel and the air intake chamber, achieving automatic cleaning of the powder barrel. After the powder barrel is cleaned, the powder outlet pipe can be opened for cleaning a powder outlet pipeline, thereby achieving automatic cleaning in the present invention by means of air purging. The use of the control circuit to control the present invention makes the present invention more convenient to operate and more automated.

Brief Description of the Drawings

Description of the Drawings

The following further describes the present invention in detail with reference to the accompanying drawings and specific implementations.

FIG. 1 is a schematic structural diagram of the present invention; and
FIG. 2 is a schematic cross-sectional structural view of FIG. 1 along a line A-A.

Detailed Description of the Preferred Embodiments

Implementations of the present invention

As shown in the figures, a powder feeding center capable of automatically cleaning includes a powder barrel 2 and a pressure maintaining housing 1 that are cylindrical and coaxial. The powder barrel 2 is mounted in the pressure maintaining housing 1 in a hanging way, which means that an outer diameter of the powder barrel 2 is smaller than an inner diameter of the pressure maintaining housing 1, and a gap exists between the top of the powder barrel 2 and the top of the pressure maintaining housing 1 and a gap exists between the bottom of the powder barrel 2 and the bottom of the pressure maintaining housing 1, so that a pressure stabilizing cavity is formed between an outer surface of the powder barrel 2 and an inner surface of the pressure maintaining housing 1. In this embodiment, two horizontally disposed support rods 7 are fixedly connected to the outer surface of the powder barrel 2. The other end portion of the support rod 7 is fixedly connected to the inner surface of the pressure maintaining housing 1, so that the powder barrel 2 is mounted in a hanging way.
A pressure detection device is mounted in the pressure maintaining housing 1. A feed hopper 12 that can be closed is disposed on the top of the pressure maintaining housing 1 corresponding to the powder barrel 2. A feed pipe 13 extending into the powder barrel 2 is disposed below the feed hopper 12. A feed valve 14 is mounted on the feed pipe 13 to control opening or closing thereof. A pressure stabilizing mouth is provided on the top of the pressure maintaining housing 1, and a powder cleaning mouth is provided at the bottom of pressure maintaining housing 1. A pressure stabilizing valve 23 is mounted on the pressure stabilizing mouth, and a powder cleaning valve is mounted on the powder cleaning mouth. A purging device capable of moving up and down and used for purging an inner cavity of the powder barrel 2 is fixedly mounted on the pressure maintaining housing 1. A top wall of the pressure maintaining housing 1 in this embodiment is horizontally disposed. Any longitudinal section of a bottom wall of the pressure maintaining housing 1 is arc-shaped. The powder cleaning mouth is provided at a lowest point on the bottom wall. In the pressure maintaining housing 1 having such a structure, the horizontal top wall can ensure the stabilization of pressure above the powder barrel 2, and the arc-shaped bottom wall facilitates powder cleaning. For ease of maintenance, a maintenance operation gate that can be opened and closed is mounted on a side portion of the pressure maintaining housing 1.
In this embodiment, both of the top and the bottom of the powder barrel 2 are open. At least one powder outlet is provided on a side wall of the powder barrel 2. The powder outlet is provided near a lower portion of the powder barrel 2, making it convenient to let powder out. A powder outlet pipe 22 whose end portion protrudes from the pressure maintaining housing 1 is connected to the powder outlet. An air intake chamber 20 capable of moving up and down in the pressure maintaining housing 1 is disposed at the bottom of the powder barrel 2. The air intake chamber 20 is driven by a driving device mounted on the pressure maintaining housing 1. The air intake chamber 20 can close the bottom of the powder barrel 2 when moving to a highest point. The air intake chamber 20 includes a top wall, a bottom wall, and a ring-shaped side wall. The air intake chamber 20 is coaxial with the powder barrel 2. An outer diameter of the top wall of the air intake chamber 20 is greater than the outer diameter of the powder barrel 2. An opening whose outer diameter is slightly smaller than an inner diameter of the powder barrel 2 is provided on the top wall of the air intake chamber 20, and a fluidization plate 21 capable of communicating the air intake chamber 20 with the powder barrel 2 is fixedly mounted on the opening. The structure of the fluidization plate 21 is a structure obtained according to the prior art, and a person skilled in the art can select an appropriate structure for the fluidization plate 21 according to a specific powder fluidization requirement. Therefore, the structure of the fluidization plate 21 is not described in detail herein. An air intake is provided on the side wall of the air intake chamber 20. An air intake telescopic tube 25 is connected to the air intake. An air intake pipe 26 whose end portion protrudes from the pressure maintaining housing 1 is fixedly mounted on the pressure maintaining housing 1 corresponding to the air intake. The air intake telescopic tube 25 is connected to the air intake pipe 26. An air intake valve 27 is mounted on the air intake pipe 26 to control opening or closing thereof. To enable the top of the pressure maintaining housing 1 in the present invention to apply pressure to the inside of the powder barrel 2 when pressure in the pressure maintaining housing 1 is lower than a specific value, to increase the amount of powder let out, the pressure stabilizing valve 23 is a three-way valve. One port is connected to a communicating pipe 24. The communicating pipe 24 is in communication with the air intake pipe 26. A communicating part between the communicating pipe 24 and the air intake pipe 26 is located on a pipe segment between the pressure maintaining housing 1 and the air intake valve 27. Another port is used for discharging air.
The foregoing purging device includes a driving cylinder 15 fixedly mounted on the top of the pressure maintaining housing 1. The driving cylinder 15 is a simple-structured and adjustable double-acting cylinder having a large stroke. A piston rod 16 of the driving cylinder 15 extends downward into the pressure maintaining housing 1. A purging chamber 11 capable of moving up and down in the powder barrel 2 when driven by the driving cylinder 15 is fixedly mounted on an end portion of the piston rod. The purging chamber 11 is ring-shaped, so that air outlet pressure is greater and powder is more thoroughly purged at a same air intake pressure, and the feed pipe 13 is easily disposed. The feed pipe 13 may directly run through an intermediate through hole of the purging chamber 11 and extend into the powder barrel 2, avoiding interference between the feed pipe 13 and the purging chamber 11. An inner surface of the purging chamber 11 is connected to the piston rod of the driving cylinder 15 by using a plurality of connecting rods 29. An outer diameter of the purging chamber 11 is smaller than the inner diameter of the powder barrel 2 and is coaxial with the powder barrel 2, so that it is convenient for the purging chamber 11 to extend into the powder barrel 2 and move up and down in the powder barrel 2. In this way, effective purging can be implemented for the powder barrel 2. A plurality of purging holes is provided on a bottom wall of the purging chamber 11. The plurality of purging holes is arranged in a ring shape, and each purging hole is obliquely provided toward a same direction. In this way, air blown from the purging chamber 11 can form a cyclone, ensuring that the purging is thorough. An air inlet is provided on a top wall of the purging chamber 11. The air inlet is connected to an air inlet telescopic tube 17. The air inlet telescopic tube 17 is connected to an air inlet pipe 18 fixedly mounted on the top of the pressure maintaining housing 1. An air inlet valve 19 is mounted on the air inlet pipe 18 to control opening or closing thereof. The disposition of the air intake telescopic tube 25 and the air inlet telescopic tube 17 can ensure that a connection structure of the pipes is not affected when the air intake chamber 20 and the purging chamber 11 move up and down.
In the present invention, the driving device may include a primary cylinder fixedly mounted on the pressure maintaining housing 1. An outer diameter of the air intake chamber 20 is greater than the outer diameter of the powder barrel 2. At least one pull rod extending upward is fixedly mounted on an outer edge of the top wall of the air intake chamber 20, and the top end of the pull rod is connected to a piston rod of the primary cylinder. The primary cylinder drives the pull rod to move up and down, so that the air intake chamber 20 moves up and down.
To make the structure of the present invention simpler, the purging device and the driving device are interlocked in this embodiment. That is, the driving device and the purging device share the driving cylinder 15 and the purging chamber 11, and the at least one pull rod 3 extending upward is fixedly mounted on the outer edge of the top wall of the air intake chamber 20. In this embodiment, there are two pull rods 3 disposed opposite to each other. A compression rod 4 extending inward horizontally is fixedly mounted at the top end of each pull rod 3. A distance between end portions of the two compression rods 4 is smaller than the outer diameter of the purging chamber 11, so that the end portions of the compression rods 4 can press against an upper surface of the purging chamber 11. In addition, the stroke of the driving cylinder 15 can ensure that the fluidization plate 21 of the air intake chamber 20 can close the bottom of the powder barrel 2 when the purging chamber 11 is at a highest point. That is, when the driving cylinder 15 drives the purging chamber 11 to move upward, the compression rod 4 moves upward along with the purging chamber 11, thereby causing the air intake chamber 20 to move upward, and further causing the fluidization plate 21 of the air intake chamber 20 to close the bottom of the powder barrel 2. In view of the foregoing structural requirements, the length of the pull rod 3 needs to be greater than the height of the powder barrel 2. A difference between the length of the pull rod 3 and the height of the powder barrel 2 determines a powder outlet gap between the bottom of the powder barrel 2 and the air intake chamber 20 after the air intake chamber 20 moves downward. In the driving device having such a structure, to ensure that the air intake chamber 20 moves only up and down and does not drift horizontally, and does not affect the sealing performance between the fluidization plate 21 and the powder barrel 2, a limiting rod 5 extending outward horizontally is fixedly mounted on the outer surface of the powder barrel 2. A limiting ring 6 for limiting the pull rod 3 is fixedly mounted on an end portion of the limiting rod 5. The pull rod 3 passes through the limiting ring 6. The limiting ring 6 limits the pull rod 3, to prevent the air intake chamber 20 from drifting horizontally and affecting the sealing performance between the fluidization plate 21 and the bottom of the powder barrel 2. The limiting mechanism may alternatively adopt other methods in the prior art to achieve limiting. In the present invention, a ring-shaped groove may further be provided on a lower surface of the powder barrel 2. A sealing ring is mounted in the groove, thereby increasing the sealing performance between the bottom of the powder barrel 2 and the air intake chamber 20 when contact occurs.
To improve the automation degree of the present invention, the air intake valve 27, the powder cleaning valve, the feed valve 14, the air inlet valve 19, and the pressure stabilizing valve 23 are all solenoid valves, and a control end of each of the valves is electrically connected to a control circuit. The pressure detection device is a pressure sensor, and a signal output end of the pressure detection device is electrically connected to the control circuit. The control circuit may be a programmable logic controller (PLC) control program. A specific structure of the control circuit may be obtained by a person skilled in the art according to an interlocking requirement without creative efforts, and details are not described herein.
During spraying, some powder may remain on the inner surface of the pressure maintaining housing after each cleaning. Because colors or the like of powder used at different batches may be different, if relatively much powder remains in the powder barrel, during cleaning, the relatively much powder may be mixed with the powder remaining on the inner surface of the pressure maintaining housing, leading to that the powder is polluted and cannot be reused. Therefore, in the present invention, a powder discharging mouth is provided at the bottom of the side wall of the powder barrel. A powder discharging pipe 28 whose end portion protrudes from the pressure maintaining housing is connected to the powder discharging mouth. There may be a plurality of powder discharging mouths evenly arranged on the side wall of the powder barrel in a ring shape. The number of the powder discharging pipes corresponds to the number of the powder discharging mouths. A powder discharging valve is disposed on each powder discharging pipe to control opening or closing thereof. The powder discharging pipe may be connected to the original powder containing barrel.
During preparation of spraying, the powder outlet pipe 22 is connected to a spray gun. The air intake valve 27 is opened, so that there is a specific pressure in the pressure maintaining housing 1, and the pressure stabilizing valve 23 is intermittently opened, so that the pressure stabilizing valve 23 relieves pressure, causing the pressure in the pressure maintaining housing 1 to main at a certain level. In addition, air is let in to the air intake chamber 20, to fluidize powder. After the fluidization is completed, the spray gun is opened to start spraying. When the pressure in the pressure maintaining housing 1 is lower than a specified value, the control circuit controls the valve port that is of the pressure stabilizing valve 23 and that is connected to the communicating pipe 24 to be opened, so that air comes through both the air intake pipe 26 and the pressure stabilizing mouth into the pressure maintaining housing 1. In this case, the powder in the powder barrel 2 is blown by air from below, and is also depressed by air from the pressure stabilizing mouth, thereby increasing the speed of powder outlet through the powder outlet, further increasing powder content per unit volume, and improving the effect of spraying. In addition, in the present invention, because the pressure in the pressure maintaining housing 1 is maintained at the specified value all the time, constant-pressure powder feeding by the powder barrel 2 is implemented.
When powder in the powder barrel 2 is cleaned for feeding new powder, the air intake valve 27 is closed, the powder discharging valve is opened, and the air intake valve of the purging device is opened for purging. In this case, the driving cylinder is in a standby state, so that the purging device performs purging while keeping still. Most of the powder is discharged through the powder discharging pipe under the pressure of air from above. The disposition of the powder discharging pipe improves the utilization of the powder remaining in the powder barrel, and reduces the operation costs of the entire device. After the powder in the powder barrel is completely removed, the driving cylinder is opened for purging up and down. The driving cylinder 15 drives the purging chamber 11 to move downward, and a cyclone is formed for purging. In this case, the air intake chamber 20 moves downward and detaches from the powder barrel 2 under the action of gravity, so that powder starts to be blown to the outside through the powder outlet gap between the powder barrel 2 and the air intake chamber 20 and falls at the bottom of the pressure maintaining housing 1. After a plurality of times of reciprocal purging, the purging device and the air intake chamber 20 return to their original positions. The powder cleaning valve is opened, so that an airflow runs through the gap between the powder barrel 2 and the pressure maintaining housing 1, purges the powder remaining in the gap, and blows the collected powder falling at the bottom of the pressure maintaining housing 1 to the outside. After the collected powder is blown to the outside, the powder cleaning valve is closed, and the powder outlet pipes 22 are opened one by one for cleaning. After the cleaning is completed, the pressure stabilizing valve 23 is opened for pressure relief. After the pressure relief is completed, the feed valve 14 of the feed hopper 12 is opened for powder feeding. After the powder feeding is completed, the present invention is in a standby state. In the present invention, the purging chamber 11 capable of moving up and down is disposed, and the air intake chamber 20 is capable of moving up and down along with the purging chamber 11, so that the powder outlet gap is formed between the powder barrel 2 and the air intake chamber 20, achieving automatic cleaning of the powder barrel 2. After the powder barrel 2 is cleaned, the powder outlet pipe 22 can be opened for cleaning. The automatic cleaning in the present invention is implemented by using air purging. The use of the control circuit to control the present invention makes the present invention more convenient to operate and more automated.
The foregoing descriptions are merely preferred embodiments of the present invention, and are not intended to limit the present invention. Although the present invention is described in detail with reference to the foregoing embodiments, a person skilled in the art may still make modifications to the technical solutions recorded in the foregoing embodiments or make equivalent replacements to some technical features thereof. Any modification, equivalent replacement, or improvement made without departing from the scope of the inventive concept of the present invention should fall within the protection scope of the present invention.

Claims

A powder feeding center capable of automatically cleaning, comprising a powder barrel (2), and further comprising a pressure maintaining housing (1), wherein a pressure detection device is mounted in the pressure maintaining housing (1), the powder barrel (2) is mounted in the pressure maintaining housing (1) in a hanging way, a feed hopper (12) that can be closed is disposed on the top of the pressure maintaining housing (1) corresponding to the powder barrel (2), a pressure stabilizing mouth is provided on the top of the pressure maintaining housing (1), a powder cleaning mouth is provided at the bottom of the pressure maintaining housing (1), a pressure stabilizing valve (23) is mounted on the pressure stabilizing mouth, and a powder cleaning valve is mounted on the powder cleaning mouth; both of the top and the bottom of the powder barrel (2) are open, an air intake chamber (20) capable of moving up and down in the pressure maintaining housing (1) is disposed at the bottom of the powder barrel (2), a fluidization plate (21) capable of communicating the air intake chamber (20) with the powder barrel (2) is fixedly mounted on the top of the air intake chamber (20), the air intake chamber (20) is driven by a driving device mounted on the pressure maintaining housing (1), and the air intake chamber (20) is capable of closing the bottom of the powder barrel (2) when moving to a highest point; an air intake is provided on the air intake chamber (20), the air intake is connected to an air intake telescopic tube (25), an air intake pipe (26) whose end portion protrudes from the pressure maintaining housing (1) is fixedly mounted on the pressure maintaining housing (1) corresponding to the air intake, the air intake telescopic tube (25) is connected to the air intake pipe (26), and an air intake valve (27) is mounted on the air intake pipe (26) to control opening or closing thereof; at least one powder outlet is provided on a side wall of the powder barrel (2), and a powder outlet pipe (22) whose end portion protrudes from the pressure maintaining housing (1) is connected to the powder outlet; and a purging device capable of moving up and down and used for purging an inner cavity of the powder barrel (2) is fixedly mounted on the pressure maintaining housing (1).
The powder feeding center capable of automatically cleaning according to claim 1, wherein the pressure stabilizing valve (23) is a three-way valve, wherein one port is connected to a communicating pipe (24), and the communicating pipe (24) is in communication with the air intake pipe (26).
The powder feeding center capable of automatically cleaning according to claim 1, wherein a top wall of the pressure maintaining housing (1) is horizontally disposed, any longitudinal section of a bottom wall of the pressure maintaining housing (1) is arc-shaped, and the powder cleaning mouth is provided at a lowest point on the bottom wall.
The powder feeding center capable of automatically cleaning according to claim 1, wherein a powder discharging mouth is provided at the bottom of the side wall of the powder barrel, the powder discharging mouth is connected to a powder discharging pipe (28) whose end portion protrudes from the pressure maintaining housing, and a powder discharging valve is disposed on the powder discharging pipe to control opening or closing thereof.
The powder feeding center capable of automatically cleaning according to claim 1, wherein the purging device comprises a driving cylinder (15) fixedly mounted on the top of the pressure maintaining housing (1), a piston rod of the driving cylinder (15) extends downward into the pressure maintaining housing (1), a purging chamber (11) capable of moving up and down in the powder barrel (2) when driven by the driving cylinder (15) is fixedly mounted on an end portion of the piston rod, a plurality of purging holes is provided on a bottom wall of the purging chamber (11), an air inlet is provided on a top wall of the purging chamber (11), the air inlet is connected to an air inlet telescopic tube (17), the air inlet telescopic tube (17) is connected to an air inlet pipe (18) fixedly mounted on the top of the pressure maintaining housing (1), and an air inlet valve (19) is mounted on the air inlet pipe (18) to control opening or closing thereof.
The powder feeding center capable of automatically cleaning according to claim 5, wherein the air intake valve (27), the powder cleaning valve, the air inlet valve (19), and the pressure stabilizing valve (23) are all solenoid valves, and a control end of each of the valves is electrically connected to a control circuit; and the pressure detection device is a pressure sensor, and a signal output end of the pressure detection device is electrically connected to the control circuit.
The powder feeding center capable of automatically cleaning according to claim 5, wherein the purging chamber (11) is ring-shaped, and an inner surface of the purging chamber (11) is connected to the piston rod of the driving cylinder (15) by using a connecting rod (29); and the plurality of purging holes is provided on the bottom wall of the purging chamber (11), the plurality of purging holes is arranged in a ring shape, and each purging hole is obliquely provided toward a same direction.
The powder feeding center capable of automatically cleaning according to any one of claims 1 to 7, wherein the driving device comprises a primary cylinder fixedly mounted on the pressure maintaining housing (1); and an outer diameter of the air intake chamber (20) is greater than an outer diameter of the powder barrel (2), at least one pull rod (3) extending upward is fixedly mounted on an outer edge of a top wall of the air intake chamber (20), and the top end of the pull rod (3) is connected to a piston rod of the primary cylinder.
The powder feeding center capable of automatically cleaning according to any one of claims 5 to 7, wherein the driving device comprises the driving cylinder (15) and the purging chamber (11), the outer diameter of the air intake chamber (20) is greater than the outer diameter of the powder barrel (2), the at least one pull rod (3) extending upward is fixedly mounted on the outer edge of the top wall of the air intake chamber (20), a compression rod (4) extending inward horizontally is fixedly mounted at the top end of the pull rod (3), an end portion of the compression rod (4) can press against an upper surface of the purging chamber (11), and a stroke of the driving cylinder (15) can ensure that the fluidization plate (21) of the air intake chamber (20) can close the bottom of the powder barrel (2) when the purging chamber (11) is at a highest point; and the length of the pull rod (3) is greater than the height of the powder barrel (2).
The powder feeding center capable of automatically cleaning according to claim 9, wherein a limiting rod (5) extending outward horizontally is fixedly mounted on an outer surface of the powder barrel (2), a limiting ring (6) for limiting the pull rod (3) is fixedly mounted on an end portion of the limiting rod (5), and the pull rod (3) passes through the limiting ring (6).