CN115849018A

CN115849018A - Powder conveying structure

Info

Publication number: CN115849018A
Application number: CN202211695853.2A
Authority: CN
Inventors: 招銮; 何德生; 陈松森
Original assignee: Zhongshan Yingpu 3d Printing Technology Co ltd
Current assignee: Zhongshan Yingpu 3d Printing Technology Co ltd
Priority date: 2022-12-28
Filing date: 2022-12-28
Publication date: 2023-03-28

Abstract

The invention discloses a powder conveying structure, which comprises a diaphragm pump body, wherein two diaphragm cavities are arranged in the diaphragm pump body, elastic diaphragms are arranged in the two diaphragm cavities, the diaphragm cavities are divided into a feeding cavity and a gas distribution cavity by the elastic diaphragms, a connecting rod for connecting the two elastic diaphragms is arranged between the two elastic diaphragms, a powder feeding channel and a discharging channel which are communicated and connected with the feeding cavity are arranged in the diaphragm pump body, a valve body for feeding gas into one of the gas distribution cavities to deform the elastic diaphragms is further arranged in the diaphragm pump body, a pneumatic scattering structure for scattering powder in the feeding cavity is further arranged on the diaphragm pump body, and the pneumatic scattering structure for scattering the powder in the feeding cavity is arranged on the diaphragm pump body, so that when the diaphragm pump body conveys the powder, the powder in the feeding cavity is scattered to limit the powder to be pressed by the diaphragms to be agglomerated, and the powder can be normally and stably output.

Description

Powder conveying structure

Technical Field

The invention relates to the technical field of 3D printing and powder conveying, in particular to a powder conveying structure.

Background

In recent years, the 3D printing industry has gradually started, and there are three main printing modes, namely FDM, SLA and SLS. Different printing modes have respective advantages and disadvantages. The SLS powder sintering technology is different from the former two, and a powder printer needs to consume a large amount of powder due to the fact that powder is used as support of a model, at present, a commonly used powder feeding mode is that the powder is conveyed through a diaphragm pump, and a diaphragm in the diaphragm pump continuously reciprocates to push the powder to be sucked and output.

For example, patent application number is 202020969624.5, the patent name just discloses a diaphragm type powder delivery pump in the patent of a neotype diaphragm type powder delivery pump, this powder delivery pump includes shell and air inlet, the inside of shell is provided with the connecting rod, and the left side of connecting rod is connected with first diaphragm, first baffle is installed in the left side of first diaphragm, and the top of first baffle is provided with first ball, the top of first ball is provided with first limiting plate, the right side of connecting rod is connected with the second diaphragm, and the right side of second diaphragm installs the second limiting plate, the below of second limiting plate is provided with the second ball, and the second baffle is installed to the below of second ball, the below of air inlet is connected with pressure regulating valve, and the air inlet is located the below of connecting rod. This patent is through pressure regulating valve to the gas pressure who gets into the inner chamber is controlled, makes the diaphragm motion and then control the efficiency that the powder was carried to this. However, the powder conveying pump has a disadvantage that in the process of diaphragm movement, the extrusion force of the diaphragm can cause a compaction problem to the powder, so that the powder forms a lump in the pump body to influence the normal output of the powder, and an effective method for solving the problem is not provided at present.

The present invention has been made in view of the above circumstances.

Disclosure of Invention

The invention overcomes the defects of the prior art and provides a powder conveying structure capable of limiting powder to form agglomerates in a feeding cavity.

The invention is realized by the following technical scheme:

the utility model provides a powder transport structure, includes the diaphragm pump body, the internal two diaphragm chambeies that are equipped with of diaphragm pump, two diaphragm intracavity all are equipped with elastic diaphragm, elastic diaphragm separates the diaphragm chamber for feeding chamber and distribution chamber two parts, is equipped with the connecting rod that is connected two elastic diaphragm between two elastic diaphragm, is equipped with the powder channel and the discharging channel that advance with feeding chamber turn-on connection in the diaphragm pump body, thereby still is equipped with the valve body that is used for sending into gas into one of them distribution chamber and makes elastic diaphragm deformation in the diaphragm pump body, still is equipped with the pneumatic type that is used for breaking up the interior powder of feeding chamber on the diaphragm pump body and breaks up the structure.

The powder conveying structure comprises a gas pipe which is in conduction connection with the feeding cavity and used for blowing high-pressure gas into the feeding cavity.

According to the powder conveying structure, the gas conveying pipe is arranged on one side, close to the powder feeding channel, of the feeding cavity, the included angle between the axis of the gas conveying pipe and the powder in the conveying direction of the feeding cavity is a, and the a is an acute angle.

The powder conveying structure comprises a valve body, a valve cavity and a first air distribution cavity, wherein the valve body is provided with the valve cavity, the valve cavity is respectively communicated with the first air distribution cavity and the second air distribution cavity, a valve core capable of cutting off the communication between the valve cavity and the first air distribution cavity or between the valve cavity and the second air distribution cavity is arranged in the valve cavity, a first air supply pipe used for supplying air into the valve cavity to push the valve core to move so as to enable the valve cavity to be communicated with the first air distribution cavity is arranged on the valve body, and a second air supply pipe used for supplying air into the valve cavity so as to push the valve core to move so as to enable the valve cavity to be communicated with the second air distribution cavity is arranged on the valve body.

The powder conveying structure is characterized in that the valve body is further provided with a first pressure relief channel and a second pressure relief channel, the valve core comprises a valve core column and three plugging blocks arranged on the valve core column, the three plugging blocks are arranged at intervals along the axial direction of the valve core column in sequence, the plugging block at one end is provided with a first through hole used for communicating the first air distribution cavity with the first pressure relief channel, the plugging block at the other end is provided with a second through hole used for communicating the second air distribution cavity with the second pressure relief channel, and a limiting block used for limiting the moving distance of the valve core is further arranged in the valve cavity.

According to the powder conveying structure, the first clamping groove is formed between the powder feeding channel and the feeding cavity, the first blocking piece used for blocking the powder feeding channel is arranged in the first clamping groove, the first step structure is arranged between the first clamping groove and the feeding cavity, and the first reset spring used for enabling the first blocking piece to be flushed and then blocking the powder feeding channel again is arranged between the first blocking piece and the first step structure.

The powder conveying structure is characterized in that a second clamping groove is formed between the discharging channel and the feeding cavity, a second blocking piece used for blocking the feeding cavity is arranged in the second clamping groove, a second step structure is arranged between the second clamping groove and the discharging channel, and a second reset spring used for enabling the second blocking piece to be flushed open and then blocking the feeding cavity again is arranged between the second blocking piece and the second step structure.

According to the powder conveying structure, the first blocking piece and the second blocking piece are both round balls.

According to the powder conveying structure, the air distribution cavity is arranged on the inner side of the feeding cavity, the diaphragm pump body is internally provided with the guide groove for guiding the movement of the connecting rod, the two ends of the connecting rod are provided with the threaded holes, and the elastic diaphragm is connected to the connecting rod through the bolts.

According to the powder conveying structure, the lower part of the diaphragm pump body is provided with the supporting seat for supporting the diaphragm pump body.

Compared with the prior art, the invention has the following advantages:

according to the invention, the diaphragm pump body is provided with the pneumatic scattering structure for scattering powder in the feeding cavity, so that when the diaphragm pump body conveys the powder, the powder in the feeding cavity is scattered, the powder is limited to be compacted and agglomerated by the diaphragm, and the powder can be normally and stably output.

Connect high-pressure gas source and then blow in the pay-off intracavity with high-pressure gas through the gas-supply pipe, break up the powder through the gas of blowing in and let the powder become loose state, the reinforcing mobility lets the powder export better.

The gas pipe is arranged on one side of the feeding cavity close to the powder feeding channel, and the included angle between the axis of the gas pipe and the powder in the conveying direction of the feeding cavity is an acute angle a, so that the flowing direction of the blown gas is close to the conveying direction of the powder, and the powder is conveyed better.

Drawings

The following detailed description of embodiments of the invention is provided in conjunction with the appended drawings, in which:

FIG. 1 is a cross-sectional view of the present invention;

FIG. 2 is a schematic structural view of the present invention;

FIG. 3 is an enlarged view of portion A of FIG. 1;

FIG. 4 is a schematic view showing the structure in which the second distribution chamber communicates with the second air feed pipe;

FIG. 5 is an enlarged view of portion B of FIG. 1;

fig. 6 is an enlarged view of a portion C in fig. 1.

Detailed Description

The invention is further described below with reference to the accompanying drawings:

a powder conveying structure as shown in fig. 1 to 6, which includes a diaphragm pump body 1, a pair of diaphragm cavities is provided in the diaphragm pump body 1, an elastic diaphragm 2 is provided in each diaphragm cavity, the elastic diaphragm 2 divides the diaphragm cavity into a feeding cavity 3 and a distributing cavity, the distributing cavity is provided at the inner side of the feeding cavity 3, a connecting rod 5 for connecting the two elastic diaphragms 2 is provided between the two elastic diaphragms 2, a powder inlet channel 6 and a powder outlet channel 7 are provided in the diaphragm pump body 1, the powder inlet channel and the powder outlet channel are in conductive connection with the feeding cavity 3, a valve body for feeding gas into one of the distributing cavities to deform the elastic diaphragm 2 is further provided in the diaphragm pump body 1, and a pneumatic scattering structure for scattering powder in the feeding cavity 3 is further provided on the diaphragm pump body 1.

Through be equipped with the structure of breaing up that is used for breaing up the interior powder of material feeding chamber 3 on the diaphragm pump body 1 to when the diaphragm pump body 1 carried the powder, thereby the powder of limit powder in the material feeding chamber 3 of breaing up compresses tightly the caking by elastic diaphragm 2, lets the powder can normally stabilize the output.

The scattering structure comprises a gas pipe 8 which is connected with the feeding cavity 3 in a conduction mode and used for blowing high-pressure gas into the feeding cavity 3, the high-pressure gas is connected with a high-pressure gas source through the gas pipe 8 and blown into the high-pressure gas, and the high-pressure gas is gas with the gas pressure higher than that of the feeding cavity 3 when the diaphragm pump body 1 works. The high-pressure air source can be an air compressor or a high-pressure air tank, the air output end of the air compressor is connected through the air conveying pipe 8, so that air is blown into the feeding cavity 3, powder is scattered through the blown air to enable the powder to be in a loose state, the flowability is enhanced, and the powder can be better output.

In an embodiment, the gas pipe 8 is disposed on one side of the feeding cavity 3 close to the powder feeding channel 6, an included angle between an axis of the gas pipe 8 and the powder in the conveying direction of the feeding cavity 3 is a, and a is an acute angle, so that the flowing direction of the blown gas is close to the conveying direction of the powder, and the powder is conveyed better.

As shown in fig. 1 to 4, the two air distribution chambers are a first air distribution chamber 41 and a second air distribution chamber 42, the valve body includes a valve chamber 91, the valve chamber 91 is respectively communicated with the first air distribution chamber 41 and the second air distribution chamber 42, a valve core capable of cutting off the communication between the valve chamber 91 and the first air distribution chamber 41 or between the valve chamber 91 and the second air distribution chamber 42 is arranged in the valve chamber 91, a first air supply pipe 92 for supplying air into the valve chamber 91 to push the valve core to move so as to communicate the valve chamber 91 and the first air distribution chamber 41 is arranged on the valve body, and a second air supply pipe 93 for supplying air into the valve chamber 91 to push the valve core to move so as to communicate the valve chamber 91 and the second air distribution chamber 42 is arranged on the valve body. In one embodiment, the first air supply pipe 92 and the second air supply pipe 93 can be connected to an air compressor to supply air, and can also be connected to a high-pressure air tank to supply air.

Still be equipped with first pressure release passageway 95 and second pressure release passageway 96 on the valve body, the case includes valve stem 991 and locates three sprue 992 on the valve stem 991, three sprue 992 sets up along the axial interval in proper order of valve stem 991, is equipped with the first through-hole 993 that is used for making first gas distribution chamber 41 and first pressure release passageway 95 intercommunication on the sprue 992 of one end, is equipped with the second through-hole 994 that is used for making second gas distribution chamber 42 and second pressure release passageway 96 intercommunication on the sprue 992 of the other end, still is equipped with the stopper 995 that is used for limiting case displacement in the valve pocket 91, limits case displacement through stopper 995, through the break-make of messenger each part more accurate.

When the first air supply pipe 92 is filled with air, the valve core is pushed to move along the valve cavity 91, the valve cavity 91 is communicated with the first air distribution cavity 41 after the valve core moves for a certain distance, the first pressure relief channel 95 is blocked by the blocking block 992, the air input by the first air supply pipe 92 flows through the valve cavity 91 and enters the first air distribution cavity 41, the air pressure in the first air distribution cavity 41 is increased, the elastic diaphragm 2 is further expanded to compress the feeding cavity 3, the powder is further extruded into the powder discharge channel 7 and is output, when the elastic diaphragm 2 at the first air distribution cavity 41 is expanded, the elastic diaphragm 2 at the second air distribution cavity 42 is pulled by the connecting rod 5, the air in the second air distribution cavity 42 is extruded by the elastic diaphragm 2 and enters the valve cavity 91 and flows into the second pressure relief channel 96 through the second through hole 994 to discharge the diaphragm pump body 1, and at this time, the feeding cavity 3 at the second air distribution cavity 42 can form negative pressure suction powder.

When the second air supply pipe 93 is filled with air, the valve core is pushed to move along the valve cavity 91, after the valve core moves for a certain distance, the valve cavity 91 is communicated with the second air distribution cavity 42, the second pressure relief channel 96 is blocked by the blocking block 992, the air input by the second air supply pipe 93 flows through the valve cavity 91 and enters the second air distribution cavity 42, the air pressure in the second air distribution cavity 42 is increased, the elastic diaphragm 2 is further bulged, the elastic diaphragm 2 compresses the feeding cavity 3, the powder is further extruded into the powder outlet channel 7 and is output, when the elastic diaphragm 2 at the second air distribution cavity 42 is bulged, the elastic diaphragm 2 at the first air distribution cavity 41 is pulled through the connecting rod 5, the air in the first air distribution cavity 41 is extruded by the elastic diaphragm 2 and enters the valve cavity 91 and flows into the first through hole 993 to enter the first through hole 993 and is discharged out of the diaphragm pump body 1, and then the feeding cavity 3 at the first air distribution cavity 41 can form negative pressure suction powder.

As shown in fig. 5 to 6, a first clamping groove 10 is provided between the powder feeding channel 6 and the feeding cavity 3, a first blocking member 101 for blocking the powder feeding channel 6 is provided in the first clamping groove 10, a first step structure 102 is provided between the first clamping groove 10 and the feeding cavity 3, and a first return spring 103 for re-blocking the powder feeding channel 6 after the first blocking member 101 is opened is provided between the first blocking member 101 and the first step structure 102. When the feeding chamber 3 is under negative pressure, the powder will break the first blocking member 101 and be sucked into the feeding chamber 3.

Be equipped with second draw-in groove 20 between powder passageway 7 and the pay-off chamber 3, be equipped with the second stifled piece 201 that is used for plugging up the pay-off chamber 3 in the second draw-in groove 20, be equipped with second stair structure 202 between second draw-in groove 20 and the powder passageway 7 of going out, be equipped with between second stifled piece 201 and the second stair structure 202 and make second stifled piece 201 blockked up the second reset spring 203 that plugs up the pay-off chamber 3 again after being washed out. When the elastic diaphragm 2 compresses the feeding chamber 3, the powder will be pressed and will be pushed out of the second blocking member 102 into the powder outlet channel 7 and be output.

In one embodiment, the first and

second closure members

101, 201 are round balls. In one embodiment, the diaphragm pump body 1 is provided with a guide groove 30 for guiding the movement of the connecting rod 5, the two ends of the connecting rod 5 are provided with threaded holes 40, and the elastic diaphragm 2 is connected to the connecting rod 5 through bolts 401.

The lower part of the diaphragm pump body 1 is provided with a support seat 50 for supporting the diaphragm pump body 1. The diaphragm pump body 1 can be stably placed by the support seat 50.

Claims

1. A powder conveying structure is characterized in that: the device comprises a diaphragm pump body (1), wherein two diaphragm cavities are arranged in the diaphragm pump body (1), elastic diaphragms (2) are arranged in the two diaphragm cavities, the diaphragm cavities are divided into a feeding cavity (3) and a gas distribution cavity by the elastic diaphragms (2), a connecting rod (5) connected with the two elastic diaphragms (2) is arranged between the two elastic diaphragms (2), a powder feeding channel (6) and a discharging channel (7) which are connected with the feeding cavity (3) in a conducting mode are arranged in the diaphragm pump body (1), a valve body used for feeding gas into one of the gas distribution cavities to enable the elastic diaphragms (2) to deform is further arranged in the diaphragm pump body (1), and a pneumatic scattering structure used for scattering powder in the feeding cavity (3) is further arranged on the diaphragm pump body (1).

2. The powder conveying structure according to claim 1, wherein: the scattering structure comprises a gas pipe (8) which is communicated with the feeding cavity (3) and is used for blowing high-pressure gas into the feeding cavity (3).

3. The powder conveying structure according to claim 2, wherein: the gas transmission pipe (8) is arranged on one side, close to the powder feeding channel (6), of the feeding cavity (3), the included angle between the axis of the gas transmission pipe (8) and the powder in the conveying direction of the feeding cavity (3) is a, and the a is an acute angle.

4. The powder conveying structure according to claim 1, wherein: the gas distribution chamber comprises a first gas distribution chamber (41) and a second gas distribution chamber (42), the valve body comprises a valve chamber (91), the valve chamber (91) is communicated with the first gas distribution chamber (41) and the second gas distribution chamber (42) respectively, a valve core capable of cutting off the communication between the valve chamber (91) and the first gas distribution chamber (41) or between the valve chamber (91) and the second gas distribution chamber (42) is arranged in the valve chamber (91), a first gas supply pipe (92) used for supplying gas to the valve chamber (91) to push the valve core to move so as to enable the valve chamber (91) to be communicated with the first gas distribution chamber (41) is arranged on the valve body, and a second gas supply pipe (93) used for supplying gas to the valve chamber (91) to push the valve core to move so as to enable the valve chamber (91) to be communicated with the second gas distribution chamber (42) is arranged on the valve body.

5. The powder conveying structure according to claim 4, wherein: still be equipped with first pressure release passageway (95) and second pressure release passageway (96) on the valve body, the case includes valve stem (991) and locates three sprue (992) on valve stem (991), three sprue (992) are along valve stem (991) axial interval setting in proper order, are equipped with first through-hole (993) that are used for making first air distribution chamber (41) and first pressure release passageway (95) intercommunication on sprue (992) of one end, are equipped with second through-hole (994) that are used for making second air distribution chamber (42) and second pressure release passageway (96) intercommunication on sprue (992) of the other end, still are equipped with stopper (995) that are used for restricting case displacement in valve pocket (91).

6. A powder conveying structure according to claim 1, wherein: it is equipped with first draw-in groove (10) to advance between powder passageway (6) and pay-off chamber (3), be equipped with in first draw-in groove (10) and be used for plugging up first stifled piece (101) of advancing powder passageway (6), be equipped with first stair structure (102) between first draw-in groove (10) and pay-off chamber (3), be equipped with between first stifled piece (101) and first stair structure (102) and make first stifled piece (101) be broken open the back and plug up first reset spring (103) of advancing powder passageway (6) again.

7. The powder conveying structure according to claim 6, wherein: be equipped with second draw-in groove (20) between discharging channel (7) and pay-off chamber (3), be equipped with in second draw-in groove (20) and be used for plugging up second sprue (201) in pay-off chamber (3), be equipped with second stair structure (202) between second draw-in groove (20) and discharging channel (7), be equipped with between second sprue (201) and second stair structure (202) and make second sprue (201) be broken open the back and plug up second reset spring (203) in pay-off chamber (3) again.

8. The powder conveying structure according to claim 7, wherein: the first blocking piece (101) and the second blocking piece (201) are both round balls.

9. The powder conveying structure according to claim 1, wherein: the air distribution cavity is arranged on the inner side of the feeding cavity (3), a guide groove (30) for guiding the movement of the connecting rod (5) is formed in the diaphragm pump body (1), threaded holes (40) are formed in two ends of the connecting rod (5), and the elastic diaphragm (2) is connected to the connecting rod (5) through bolts (401).

10. The powder conveying structure according to claim 1, wherein: the lower part of the diaphragm pump body (1) is provided with a supporting seat (50) for supporting the diaphragm pump body (1).