An automatic powder returning device and a powder distributor comprising the same

Abstract

The application discloses an automatic powder returning device, which comprises a fan and a material collecting assembly, the material collecting assembly comprises a hopper for collecting powder and an air cavity; a separating device for separating air and powder is arranged between the air cavity and the fan, the air cavity is communicated with an air inlet end of the separating device through a powder returning pipe, and an air outlet end of the separating device is communicated with an air inlet end of the fan through a suction pipe; a blockage preventing valve is arranged on one side of the air cavity; the blockage preventing valve comprises a hollow valve body, an inner portion of the valve body is provided with a valve core, one end of the valve core is provided with a block, and the other end of the valve core is provided with a valve hole communicated with the air cavity; a block hole is arranged in the center of the block, and a valve core hole is arranged on the valve core. The application adopts the air pressure of the fan as power to recycle the powder, and has the advantages of high automation degree and blockage prevention.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of powder recycling, in particular to an automatic powder recycling device and a powder spraying machine comprising the same. BACKGROUND

[0002] The powder spraying machine is widely used in the fields of heat transfer printing, printing powder shaking machine and food processing. In order to ensure that the powder receiving area of the workpiece is fully and uniformly coated, the powder spraying machine sprays excess powder in the powder receiving area to improve the probability of powder receiving. However, the excess powder will fall off the workpiece without being absorbed. In order to reduce waste, the falling powder needs to be recycled and reused. Therefore, a collecting device is generally arranged in the falling area to collect the falling powder. In the prior art, the collected powder is manually recycled from the collecting device to the powder spraying machine for reuse, which is time-consuming and laborious.

[0003] Therefore, there is an urgent need to design an automatic powder recycling device and a powder spraying machine comprising the same, which can quickly and automatically collect and recycle the powder. SUMMARY

[0004] In order to overcome the shortcomings of the prior art, the purpose of the present application is to provide an automatic powder recycling device and a powder spraying machine comprising the same, which uses the air pressure of a fan as power to recycle the powder, and has the advantages of high automation and prevention of blockage.

[0005] To solve the above problems, the technical scheme adopted by the present application is as follows:

[0006] An automatic powder recycling device, characterized in that it comprises a fan (37) and a material collecting assembly (30), wherein the material collecting assembly (30) comprises a hopper (31) for collecting powder (60) and an air cavity (32);

[0007] A separation device (20) for separating air and powder (60) is arranged between the air cavity (32) and the fan (37), the air cavity (32) is in communication with the air inlet end of the separation device (20) through a powder recycling pipe (34), and the air outlet end of the separation device (20) is in communication with the air inlet end of the fan (37) through a suction pipe (35);

[0008] A block valve (40) is arranged on one side of the air cavity (32), the block valve (40) comprises a hollow valve body (41), a valve core (43) is arranged in the valve body (41) and is in sliding sleeve connection with the inner wall of the valve body (41); one end of the valve core (43) is provided with a stop block (42) rigidly connected with the valve body (41), and the other end of the valve core (43) is provided with a valve hole (41a) in communication with the air cavity (32); a stop block air hole (42a) is arranged in the center of the stop block (42), and a valve core air hole (43a) is arranged on the valve core (43);

[0009] A spring (44) is arranged between the valve core (43) and the valve hole (41a), and the spring (44) makes the valve core (43) adhere to the stopper (42) in the state of no external force;

[0010] When the valve core (43) and the stopper (42) adhere to each other, the stopper air hole (42a) and the valve hole (41a) are in air-tight isolation;

[0011] When the valve core (43) and the stopper (42) are away from each other, the stopper air hole (42a) and the valve hole (41a) are in air-tight communication through the valve core air hole (43a).

[0012] Preferably, the air cavity (32) is arranged below the gravity direction of the hopper (31), and a hole plate (36) is arranged between the hopper (31) and the air cavity (32), and a plurality of holes are arranged on the hole plate (36) to make the air cavity (32) and the hopper (31) in air gap communication.

[0013] Preferably, the hopper (31) is a V-shaped or inverted conical thin-walled structure with open top and bottom and closed periphery.

[0014] Preferably, the stopper (42) is a magnet, and the valve core (43) is a magnetic material.

[0015] Preferably, the stopper (42) is a permanent magnet.

[0016] Preferably, the valve body (41) is a non-magnetic material.

[0017] Preferably, the fan (37) is a vortex fan.

[0018] Preferably, the separation device (20) includes one or a combination of a porous filter, a centrifugal separator or a labyrinth separator.

[0019] Preferably, the material collecting assembly (30) is provided with two or more, and a powder returning valve (33) is arranged between the air cavity (32) of each material collecting assembly (30) and the powder returning pipe (34).

[0020] A powder scattering machine, comprising the automatic powder returning device; further comprising a powder scattering device (10) arranged above the material collecting assembly (30), the powder scattering device (10) comprising a powder box (11) containing powder (60), an openable powder adding cover (12) arranged above the powder box (11), a powder scattering plate (13) arranged below the powder box (11) to make the lower part of the powder box (11) open or closed, a powder scattering plate driver (14) arranged between the powder scattering plate (13) and the powder box (11), and a vibrator (15) arranged on the powder scattering plate (13).

[0021] Preferably, the powder box (11) is in communication with the powder outlet end of the separating device (20).

[0022] Compared with the prior art, the present application has the following advantages:

[0023] 1. The air pressure of the fan is used as power to recycle the powder, which has the advantages of high automation and prevention of blockage;

[0024] 2. The combination of the air cavity and the anti-blocking valve can dredge when the powder is blocked, and can avoid pressure loss and improve the recycling efficiency;

[0025] 3. The combination of the magnetic stop block, the valve core and the spring can generate vibration through the impact of the valve core and the stop block when the powder is blocked, which improves the dredging efficiency when the powder is blocked;

[0026] 4. The impact of the valve core and the stop block generates sound, and the operator can determine the blockage condition of the powder according to the sound duration;

[0027] 5. The judgment and dredging of the powder blockage rely on the air pressure of the fan as the power source, without the need to set up sensors, motors and controllers, etc. electrical components, which is simple and reliable in structure. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a schematic diagram of the whole application;

[0029] Figure 2 is a schematic diagram of the anti-blocking valve structure.

[0030] Wherein: the powder scattering device 10, the powder box 11, the powder adding cover 12, the powder scattering plate 13, the powder scattering plate driver 14, the vibrator 15, the separating device 20, the material collecting assembly 30, the hopper 31, the air cavity 32, the powder recycling valve 33, the powder recycling pipe 34, the air suction pipe 35, the orifice plate 36, the fan 37, the anti-blocking valve 40, the valve body 41, the valve hole 41a, the stop block 42, the stop block air hole 42a, the valve core 43, the valve core air hole 43a, the spring 44, the powder receiving workpiece 50, and the powder 60. DETAILED DESCRIPTION

[0031] In order to facilitate the understanding of the present application, the present application will be described in more detail below with reference to the relevant drawings. The preferred embodiments of the present application are shown in the drawings. However, the present application can be realized in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0032] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," "up," "down," and similar expressions used in this document are for illustrative purposes only.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0034] The present invention will now be further described with reference to the accompanying drawings and specific embodiments:

[0035] like Figure 1 , 2 As shown, an automatic powder return device includes a blower 37 and a material collection assembly 30, wherein the material collection assembly 30 includes a hopper 31 for collecting powder 60 and an air chamber 32.

[0036] A separation device 20 is provided between the air chamber 32 and the fan 37 to separate air and powder 60. The air chamber 32 is connected to the air inlet of the separation device 20 through the powder return pipe 34, and the exhaust end of the separation device 20 is connected to the air inlet of the fan 37 through the suction pipe 35.

[0037] An anti-blocking valve 40 is provided on one side of the air cavity 32. The anti-blocking valve 40 includes a hollow valve body 41. Inside the valve body 41, a valve core 43 is provided that is slidably sleeved with the inner wall of the valve body 41. One end of the valve core 43 is provided with a stop block 42 that is rigidly connected to the valve body 41, and the other end of the valve core 43 is provided with a valve hole 41a that communicates with the air cavity 32. The center of the stop block 42 is provided with a stop block air hole 42a, and the valve core 43 is provided with a valve core air hole 43a.

[0038] A spring 44 is provided between the valve core 43 and the valve hole 41a. When the spring 44 is not subjected to external force, the spring 44 makes the valve core 43 fit against the stop block 42.

[0039] When the valve core 43 and the stop block 42 are in contact with each other, the stop block air hole 42a and the valve hole 41a are airtightly isolated.

[0040] When the valve core 43 and the stop block 42 are far apart, the stop block air hole 42a and the valve hole 41a are connected airtightly through the valve core air hole 43a.

[0041] The embodiment takes a powder dithering fixing machine as an example to illustrate that the powder receiving workpiece 50 is a roll-mounted transfer film in the powder dithering fixing machine, and the steps are as follows:

[0042] 1. The aggregate assembly 30 is placed below the powder dithering fixing machine corresponding to the powder sower, and after the powder 60 is sprinkled on the transfer film, the powder 60 not adsorbed by the transfer film falls from the transfer film to the hopper 31.

[0043] 2. When the amount of powder 60 in the hopper 31 reaches a certain amount, the fan 37 starts, and the negative pressure generated by the fan 37 enters the separation device 20 from the hopper 31, then through the air cavity 32, the powder returning pipe 34 and the air inlet end of the separation device 20.

[0044] 2.1. Considering the economy and environmental impact such as noise of the device operation, the fan 37 is usually set to start when the amount of powder 60 in the hopper 31 is relatively large, and the amount of powder 60 is relatively small, that is, the powder is returned, which will cause the fan 37 to start frequently, waste power and have a certain noise;

[0045] 2.2. However, when there is too much powder 60, the powder accumulates together to form a powder mass due to factors such as the weight of the powder, friction and electrostatic adsorption, and when the powder mass blocks the hopper 31, there is negative pressure in the powder returning pipe 34 and the air cavity 32 but no airflow can be formed, so the powder cannot be recovered, but the fan 37 is in high-load operation.

[0046] 2.3. Combining 2.1 and 2.2, the embodiment is provided with an air cavity 32 between the hopper 31 and the powder returning pipe 34, and a blockage prevention valve 40 is arranged on the air cavity 32. The purpose of arranging the air cavity 32 is that when the powder is not subjected to external force, the powder 60 cannot enter the air cavity 32 in a large amount to cover the blockage prevention valve 40 (when the powder 60 enters the air cavity 32 without covering the blockage prevention valve 40, it does not affect the function of the air cavity 32). The air cavity 32 of the embodiment is located below the hopper 31 and is integrally processed with the hopper 31. In another embodiment, a certain length can be reserved as the air cavity 32 at the end of the powder returning pipe 34 close to the hopper 31.

[0047] 2.4. When the working condition of item 2.2 occurs, the negative pressure generated by the fan 37 overcomes the elastic force of the spring 44 to move the valve core 43, and the external air enters the air cavity 32 from the block hole 42a, the valve core hole 43a and the valve hole 41a in sequence to form an airflow, and under the action of the airflow, the powder mass is gradually destroyed and scattered, and the scattered powder enters the separation device 20 with the airflow, thereby realizing the recovery of the powder.

[0048] 2.5 When the powder in the hopper 31 is recovered to a certain extent, the negative pressure in the air chamber 32 decreases. The spring 44 overcomes the negative pressure and makes the valve core 43 fit with the stop block 42 to cut off the external air, thereby avoiding pressure loss and improving the powder recovery efficiency.

[0049] 3. The separation device 20 separates the air and powder 60. The air is discharged from the exhaust end of the fan 37 through the suction pipe 35, and the separated powder 60 is reused in the powder spreader.

[0050] Furthermore, the air cavity 32 is located below the hopper 31 in the direction of gravity, and a perforated plate 36 is provided between the hopper 31 and the air cavity 32. The perforated plate 36 is provided with a plurality of holes that allow the hopper 31 and the air cavity 32 to communicate with each other.

[0051] The air chamber 32 is located below the hopper 31 in the direction of gravity, which allows the powder 60 to fall under the action of gravity, thereby increasing the recovery speed; the perforated plate 36 can perform preliminary filtration of the powder to prevent larger foreign objects from entering the separation device 20 and the blower 37.

[0052] Furthermore, the hopper 31 is a V-shaped or inverted conical thin-walled structure that is open at the top and bottom and closed on all sides.

[0053] Furthermore, the stop 42 is a magnet, and the valve core 43 is made of magnetic material.

[0054] Furthermore, the stop 42 is a permanent magnet.

[0055] Furthermore, the valve body 41 is made of a non-magnetic material.

[0056] In this embodiment, the stop block 42 and the valve core 43 generate a magnetic attraction force. When the valve core 43 is released from the stop block 42 under the action of negative pressure, it needs to overcome the force of the spring 44 and the magnetic attraction force of the magnet. Under the interaction of negative pressure, magnetic attraction force and spring force, the valve core 43 reciprocates to strike the magnet. The vibration generated by the impact can accelerate the destruction of the powder clumps in the aforementioned "2.2" and improve the powder recovery efficiency. In addition, the impact will produce a loud sound. If the impact noise continues for a long time, it indicates that the hopper 31 is continuously blocked. The operator can judge the blockage of the hopper 31 based on the impact sound and check and deal with it accordingly.

[0057] Furthermore, the blower 37 is a vortex blower. Vortex blowers have a good pressure-volume curve. In this embodiment, the HG-1500 vortex blower is selected to generate a large negative pressure and a large gas flow rate, which can quickly recover the powder 60 in the hopper 31. In other embodiments, devices that can generate a certain pressure and airflow, such as air pumps or vacuum generators, can be used instead of blowers.

[0058] Further, the separating device 20 comprises one or a combination of a porous filter, a centrifugal separator or a labyrinth separator.

[0059] In this embodiment, the labyrinth separator and the porous filter are combined. The powder and air mixture is separated by the labyrinth separator first, and the porous filter is arranged at the outlet end of the labyrinth separator to prevent the powder from entering the fan 37. The porous filter in this embodiment is a 100-mesh stainless steel filter screen, which is fast and convenient to maintain and replace, and has low cost.

[0060] Further, the powder collecting assembly 30 is provided in two or more numbers, and each powder collecting assembly 30 is provided with a powder return valve 33 between the air cavity 32 and the powder return pipe 34.

[0061] During powdering, the powder 60 usually falls from both sides of the powdered workpiece 50, and the powder collecting assembly 30 is provided in two or more numbers to improve the recovery efficiency. The powder return valve 33 can avoid the imbalance of the negative pressure of the two or more powder collecting assemblies 30 to affect the recovery efficiency.

[0062] A powdering machine comprises the automatic powder return device, and further comprises a powdering device 10 arranged above the powder collecting assembly 30. The powdering device 10 comprises a powder box 11 containing the powder 60. An openable powder adding cover 12 is arranged above the powder box 11. A powdering plate 13 is arranged below the powder box 11 to open or close the lower part of the powder box 11. A powdering plate driver 14 is arranged between the powdering plate 13 and the powder box 11. A vibrator 15 is arranged on the powdering plate 13.

[0063] Further, the powder box 11 is in communication with the powder outlet end of the separating device 20.

[0064] In this embodiment, before starting, the operator opens the powder adding cover 12 to add the powder 60 to the powder box 11. During powdering, the powdering plate driver 14 drives the powdering plate 13 to rotate to form an opening at the bottom of the powder box 11, and the powder 60 is scattered from the opening. The vibrator 15 vibrates the powdering plate 13 to prevent the powder from blocking the opening and improve the stability of powdering.

[0065] The powder 60 separated from the separating device 20 returns to the powder box 11 for recycling.

[0066] For those skilled in the art, other various corresponding changes and modifications can be made according to the above-described technical solutions and concepts, and all of these changes and modifications should belong to the protection scope of the claims of the present application.

Claims

1. A duster comprising an automatic refill device, characterised in that: The automatic powder returning device comprises a fan (37) and a powder collecting assembly (30), the powder collecting assembly (30) comprises a hopper (31) for collecting powder (60) and an air cavity (32); A separation device (20) for separating air and powder (60) is arranged between the air cavity (32) and the fan (37), the air cavity (32) is communicated with the air inlet end of the separation device (20) through a powder returning pipe (34), and the air outlet end of the separation device (20) is communicated with the air inlet end of the fan (37) through a suction pipe (35); A blockage prevention valve (40) is arranged on one side of the air cavity (32), the blockage prevention valve (40) comprises a hollow valve body (41), an inner portion of the valve body (41) is provided with a valve core (43) which is slidably sleeved with the inner wall of the valve body (41); one end of the valve core (43) is provided with a stop block (42) which is rigidly connected with the valve body (41), and the other end of the valve core (43) is provided with a valve hole (41a) which is communicated with the air cavity (32); a center of the stop block (42) is provided with a stop block air hole (42a), and the valve core (43) is provided with a valve core air hole (43a); A spring (44) is arranged between the valve core (43) and the valve hole (41a), under the condition that the valve core (43) and the stop block (42) are not subjected to external force, the spring (44) makes the valve core (43) adhere to the stop block (42); When the valve core (43) and the stop block (42) adhere to each other, the stop block air hole (42a) and the valve hole (41a) are in airtight isolation; When the valve core (43) and the stop block (42) are away from each other, the stop block air hole (42a) and the valve hole (41a) are in airtight communication through the valve core air hole (43a); A powder scattering device (10) is arranged above the powder collecting assembly (30).

2. A duster as claimed in claim 1 wherein: The air cavity (32) is arranged below the hopper (31) in the direction of gravity, a hole plate (36) is arranged between the hopper (31) and the air cavity (32), and a plurality of holes for communicating the air gap between the hopper (31) and the air cavity (32) are arranged on the hole plate (36).

3. A duster as claimed in claim 1 wherein: The hopper (31) is a V-shaped or inverted conical thin-walled structure which is open at the top and bottom and closed at the periphery.

4. A duster as claimed in claim 1 wherein: The stop block (42) is a magnet, and the valve core (43) is a magnetic material.

5. A duster as claimed in claim 4 wherein: The stop block (42) is a permanent magnet, and the valve body (41) is a non-magnetic material.

6. A duster as claimed in claim 1 wherein: The fan (37) is a vortex fan.

7. A duster as claimed in claim 1 wherein: The separation device (20) comprises one or a combination of a porous filter, a centrifugal separator or a labyrinth separator.

8. A duster as claimed in claim 1 wherein: The powder collecting assembly (30) is provided with two or more, and a powder returning valve (33) is arranged between the air cavity (32) and the powder returning pipe (34) of each powder collecting assembly (30).

9. A duster as claimed in claim 1 wherein: The powder scattering device (10) comprises a powder box (11) for containing powder (60), an openable powder adding cover (12) is arranged above the powder box (11), a powder scattering plate (13) for opening or closing the lower part of the powder box (11) is arranged below the powder box (11), a powder scattering plate driver (14) is arranged between the powder scattering plate (13) and the powder box (11), and a vibrator (15) is arranged on the powder scattering plate (13).

10. A duster as claimed in claim 9, characterized in that: The powder box (11) is communicated with the powder outlet end of the separating device (20).

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