CN113697140B

CN113697140B - Powder filling machine

Info

Publication number: CN113697140B
Application number: CN202111014511.5A
Authority: CN
Inventors: 董青山; 毛君豪; 丁岩; 刘广磊; 赵文龙
Original assignee: Zhengzhou Tongding Machinery Equipment Co ltd
Current assignee: Zhengzhou Tongding Machinery Equipment Co ltd
Priority date: 2021-08-31
Filing date: 2021-08-31
Publication date: 2023-11-24
Anticipated expiration: 2041-08-31
Also published as: CN113697140A

Abstract

The utility model relates to a powder filling machine, which comprises a conveying cylinder body and a spiral conveying groove, wherein a main screw is coaxially and rotatably assembled in the conveying cylinder body, a worm wheel shell is arranged on the conveying cylinder body, an inner cavity of the worm wheel shell is communicated with an inner cavity of the conveying cylinder body, a material blocking worm wheel is supported and assembled in the worm wheel shell, a central axis of the material blocking worm wheel is perpendicular to that of the main screw, the material blocking worm wheel is correspondingly and spirally matched with the main screw, the main screw drives the material blocking worm wheel to rotate, in a front-back direction, a meshing position of worm teeth of the material blocking worm wheel and the main screw is positioned in front of a feeding cavity, so that powder in the spiral groove extending into the main screw is blocked from rotating along with the main screw to establish filling pressure, the powder can be accelerated to move forwards, the filling speed is improved, high-speed compact filling of a valve pocket of the powder can be realized without high-speed blending high-pressure air, dust generated when the valve powder is filled into the valve pocket is reduced, and the purposes of efficient filling and environmental protection are achieved.

Description

Powder filling machine

Technical Field

The utility model relates to a powder filling machine.

Background

At present, a packing machine for filling powder valve bags in the dry powder mortar industry in the market has air-floating type, centrifugal type, screw type and other structures, wherein the air-floating type and centrifugal type valve bag packing machine needs to mix compressed air into powder of a filling pipe, so that the flow property of dry powder is improved. The mixed compressed air can improve the filling speed of the dry powder, but the powder can enter the valve pocket together with the compressed air, and the compressed air in the bag is discharged after filling is finished, so that the compressed air in the bag is difficult to discharge in practice, the compactness of the powder in the bag cannot meet the requirements of users, and the discharged compressed air can carry dust, so that the load of dust removing equipment is increased.

The quantitative filling machine for the powdery material valve bags is characterized in that a screw type packing machine adopts a screw to convey powder, such as a quantitative filling machine for the powdery material valve bags disclosed in the patent with the authority publication number of CN2542563Y, and the quantitative filling machine comprises a cylinder which extends downwards from back to front in an inclined manner, wherein a feed inlet is arranged at the upper side of the cylinder, a discharge outlet is arranged at the front end of the cylinder, a hopper is arranged at the position, corresponding to the feed inlet, of the upper side of the cylinder, an auger is coaxially arranged in the cylinder, the auger is driven to rotate by a driving mechanism positioned at the rear end, and when the auger rotates forwards, the powder is conveyed forwards and discharged through the discharge outlet so as to fill the valve bags with the powder. The screw type packaging machine has the advantages of simple structure, convenient control and wide application. However, the screw type packing machine may not compress compressed air when filling powder, but the packing speed is slow, and the user's needs are not satisfied, and if compressed air is introduced, the packing speed of dry powder is significantly increased, but after the powder is filled, air in the bag needs to be discharged, and there are problems that the air is difficult to be discharged and the load of dust removing equipment is increased.

Disclosure of Invention

The utility model aims to provide a powder filling machine so as to solve the technical problem that a screw type packing machine in the prior art is low in filling speed.

In order to achieve the above purpose, the technical scheme of the powder filling machine provided by the utility model is as follows: a powder filling machine comprising:

the rack is provided with a conveying cylinder;

the conveying cylinder body is obliquely extended downwards from back to front, the upper end of the conveying cylinder body is provided with a feed inlet, the upper part of the feed inlet is provided with a feed channel, the feed channel is provided with a feed cavity for feeding materials into the conveying cylinder body, and the front end of the conveying cylinder body is provided with a discharge hole for filling powder into corresponding packaging bags;

the main screw is coaxially and rotatably assembled in the conveying cylinder and is used for conveying powder forwards during forward rotation;

the conveying cylinder is provided with a worm wheel shell, an inner cavity of the worm wheel shell is communicated with an inner cavity of the conveying cylinder, a material blocking worm wheel is rotatably assembled in the worm wheel shell, a central axis of the material blocking worm wheel is perpendicular to a central axis of the main screw, the material blocking worm wheel is provided with worm wheel teeth extending along the circumferential direction, and the material blocking worm wheel is correspondingly meshed with the main screw, so that the main screw drives the material blocking worm wheel to rotate;

in the front-rear direction, the meshing position of the worm gear teeth of the material blocking worm gear and the main screw is positioned in front of the feeding cavity, so that the worm gear teeth extending into the spiral groove of the main screw block powder in the spiral groove from rotating along with the main screw, and filling pressure is built.

The beneficial effects are that: in the powder filling machine provided by the utility model, the material blocking worm wheel is arranged corresponding to the main screw, the material blocking worm wheel is driven by the main screw to rotate, the meshing position of the worm gear teeth of the material blocking worm wheel and the main screw is positioned in front of the feeding cavity, when the main screw conveys the powder falling from the feeding cavity forwards, the worm gear teeth can block the powder in the spiral groove of the main screw at the meshing position of the worm gear teeth and the main screw, so that the powder can be effectively prevented from rotating along with the main screw, the powder can move forwards as much as possible under the thrust of the main screw, larger filling pressure is further established, the filling speed of the powder filling machine can be effectively improved, and the filling speed of the powder can be improved without introducing high-pressure air.

As a further improvement, the worm gear shell and the material blocking worm gear are positioned on the upper side of the main screw.

The beneficial effects are that: the worm wheel shell and the material blocking worm wheel are positioned on the upper side of the main screw rod, and the main screw rod which is obliquely arranged is combined, so that the inside cleaning is convenient.

As a further improvement, the inner cavity of the worm wheel shell is communicated with the feeding cavity of the feeding channel, the part of worm wheel teeth on the rear side of the material blocking worm wheel extend into the feeding cavity, and the part of worm wheel teeth on the front side of the material blocking worm wheel are positioned on the front side of the feeding channel.

The beneficial effects are that: the part of worm gear teeth of the material blocking worm gear, which is positioned at the rear side, extends into the feeding cavity, so that the occupied space of the worm gear shell can be reduced in the front-rear direction.

As a further improvement, the thickness of the worm wheel housing is smaller than the thickness of the feed channel in the circumferential direction of the conveying cylinder.

The beneficial effects are that: the thickness of the worm wheel shell is relatively small, the self weight of the worm wheel shell is small, the pressure of the conveying cylinder is small, and meanwhile, the manufacturing cost is relatively low.

As a further improvement, the rear side of the worm wheel casing is fixedly arranged on the front side surface of the feeding channel, the extending direction of the central axis of the material blocking worm wheel is defined as the left-right direction, the worm wheel casing is provided with two side walls positioned at the left side and the right side of the material blocking worm wheel, the two side walls are in clearance fit with corresponding end faces of the material blocking worm wheel in the left-right direction, the outer sides of the two side walls, which are opposite to the material blocking worm wheel, are respectively provided with a supporting shaft sleeve, the material blocking worm wheel is coaxially fixedly provided with a wheel shaft, the wheel shaft is provided with two side shaft sections penetrating into the supporting shaft sleeves at the two sides, and the two side shaft sections are correspondingly assembled in the supporting shaft sleeves at the two sides through bearing structures in a rotating way.

The beneficial effects are that: the wheel shafts of the material blocking worm wheel are correspondingly supported by the supporting shaft sleeves on the outer sides of the left side wall and the right side wall of the worm wheel shell, and meanwhile, the left side wall and the right side wall of the worm wheel shell are in clearance fit with the corresponding end faces on the left side and the right side of the material blocking worm wheel, so that a narrower worm wheel shell is conveniently formed under the condition of ensuring normal assembly.

As a further improvement, the front part of the conveying cylinder is provided with a powder collecting cone, the powder collecting cone is positioned at the front side of the meshing position of the worm gear teeth of the material blocking worm gear and the main screw, a front end discharge hole of the powder collecting cone forms a discharge hole of the conveying cylinder, the radial dimension of the powder collecting cone is gradually reduced from back to front, a boiling head is arranged in the powder collecting cone and is coaxially and rotatably assembled at the front end of the main screw, and the boiling head is provided with stirring blades for stirring powder extruded in the powder collecting cone when the boiling head rotates; the main screw rod has the cavity that extends along fore-and-aft direction, and the cavity is rotationally equipped with interior drive shaft, and interior drive shaft rear end transmission is connected with stirring drive arrangement, interior drive shaft's front end is connected with boiling head transmission, so that stirring drive arrangement passes through interior drive shaft drive boiling head rotates, set up front end seal structure between interior drive shaft's front end with the front end of main screw rod.

The beneficial effects are that: the front end of the conveying cylinder body is provided with the powder collecting cone, the powder collecting cone is internally provided with the boiling head, powder piled in the powder collecting cone corresponds to powder, the stirring blades can be utilized to stir the powder in the rotation process of the boiling head, a boiling state is formed, the flowing performance of the powder is improved, high-speed stable powder flow is conveniently formed under the filling pressure, and the filling speed of the powder is effectively improved.

As a further improvement, the stirring blade extends in the front-rear direction, and the outer diameter dimension of the stirring blade gradually becomes smaller from rear to front.

The beneficial effects are that: the outer diameter of the stirring blade is gradually reduced from back to front, so that the periphery of the stirring blade forms a virtual cone shape, and the stirring blade is convenient to be matched with the powder collecting cone.

As a further improvement, the stirring blades are spiral blades extending along the front-back direction in the axial direction or straight blades extending along the front-back direction, and at least two straight blades are uniformly distributed along the circumferential direction of the boiling head at intervals.

As a further improvement, the front end of the powder collecting cone is welded with a filling pipe which extends forwards and is used for being inserted into a corresponding packaging bag, and the bottom of the filling pipe and the bottom of the powder collecting cone are in straight butt joint in the front-back direction.

The beneficial effects are that: the bottom of the filling pipe is in straight butt joint with the bottom of the powder collecting cone, so that the resistance is small, and the powder flowability can be improved.

As a further improvement, the front ends of the stirring blades of the boiling head extend forward into the filling tube.

The beneficial effects are that: the front ends of the stirring blades extend forwards into the filling pipe, so that the stirring performance of the powder can be further optimized, and the formation of an arch material in the filling pipe is effectively avoided.

Drawings

FIG. 1 is a schematic view of an embodiment of a powder filling machine according to the present utility model;

FIG. 2 is a front view of the powder filling machine of FIG. 1;

FIG. 3 is a cross-sectional view A-A of FIG. 2;

FIG. 4 is a schematic view of the main screw, drive shaft and boiling head assembly of FIG. 3;

FIG. 5 is an enlarged view at B in FIG. 2;

FIG. 6 is a schematic view of the powder filling machine of FIG. 1 at another angle;

FIG. 7 is a perspective view of the boiling head of FIG. 4;

FIG. 8 is a schematic view showing the structure of a boiling head in example 2 of the powder filling machine according to the present utility model;

FIG. 9 is a schematic view showing the structure of a boiling head in example 3 of the powder filling machine according to the present utility model;

fig. 10 is a schematic diagram of the structure of the boiling head in example 4 of the powder filling machine according to the present utility model.

Reference numerals illustrate:

1. a second motor; 2. a speed reducer; 3. an inner drive shaft; 4. a flange support structure; 5. a main screw; 6. a conveying cylinder; 7. a frame; 8. powder collecting cone; 9. a filling tube; 10. a boiling head; 101. a base; 102. an agitating blade; 103. a center column; 104. a scraper; 1041. an outer side surface; 1042. an inner side surface; 11. a hopper; 12. a feed channel; 121. a feed chamber; 13. a first motor; 14. a coupling; 15. a front end sealing structure; 16. a worm gear housing; 17. a material blocking worm wheel; 18. a wheel axle; 19. a support shaft sleeve; 20. a wheel shaft sealing structure; 21. balance the vent holes.

Detailed Description

The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the particular embodiments described herein are illustrative only and are not intended to limit the utility model, i.e., the embodiments described are merely some, but not all, of the embodiments of the utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present utility model.

It is noted that relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" is not intended to exclude processes, methods comprising such element.

In the description of the present utility model, the terms "mounted," "connected," "coupled," and "connected," as may be used broadly, and may be connected, for example, fixedly, detachably, or integrally, unless otherwise specifically defined and limited; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those skilled in the art in specific cases.

In the description of the present utility model, it should be noted that, unless explicitly stated and limited otherwise, the term "provided" may be interpreted broadly, and for example, an object "provided" may be a part of a body, may be separately disposed from the body, and may be connected to the body, where the connection may be a detachable connection or an undetachable connection. The specific meaning of the above terms in the present utility model can be understood by those skilled in the art in specific cases.

The present utility model is described in further detail below with reference to examples.

Specific example 1 of the powder filling machine provided by the utility model:

as shown in fig. 1 to 7, in the powder filling machine provided in this embodiment, a filling pipe 9 is disposed at a discharge port at the front end of a conveying cylinder 6, and is used for filling powder into a valve bag, a main screw 5 is mounted in the conveying cylinder 6, the main screw 5 is used for conveying the powder forward, a material blocking worm wheel 17 is configured corresponding to the main screw 5, and the material blocking worm wheel 17 is correspondingly in spiral fit with the main screw 5, so that the main screw 5 drives the material blocking worm wheel 17 to rotate, worm gear teeth of the material blocking worm wheel 17 extend into a spiral groove of the main screw 5 to block the powder in the spiral groove, so as to prevent the powder from following the rotation of the spiral groove, and ensure that the main screw can effectively push the powder forward, thereby establishing filling pressure.

In addition, as the inner diameter of the filling pipe 9 is smaller than that of the conveying cylinder 6, in order to relieve the situation that powder is accumulated at the inlet of the filling pipe 9, a boiling head 10 is arranged in a powder collecting cone 8 at the front part of the conveying cylinder 6, the boiling head 10 and a main screw 5 are coaxially and rotatably assembled, powder is stirred by stirring blades 102 on the boiling head 10, so that the powder is in a boiling state, high-speed stable powder flow is conveniently formed under filling pressure, under the condition of no compressed air mixing, a valve pocket can be densely filled with the powder at a high speed, dust generated when the valve pocket is filled with the powder is reduced, and the purposes of high-speed filling and environmental protection are achieved.

As shown in fig. 1, 2, 3 and 6, the powder filling machine comprises a frame 7 at the bottom, a conveying cylinder 6 is mounted on the frame 7, the conveying cylinder 6 extends downwards from back to front in an inclined manner, a feeding port is arranged at the upper end of the conveying cylinder 6, the feeding port is communicated with a hopper 11 through a feeding channel 12, and the feeding channel 12 is provided with a feeding cavity 121 for feeding materials into the conveying cylinder. A filling pipe 9 is arranged at a discharge hole at the front end of the conveying cylinder 6, and the axis of the filling pipe is horizontally arranged. To reduce dusting, the filler tube 9 extends into the valve pocket for filling powder, the outer diameter of the filler tube 9 being smaller, so that the inner diameter of the filler tube 9 is also smaller, typically smaller than the inner diameter of the transfer cylinder 6.

Generally, for convenient cleaning of powder, the included angle between the axis of the conveying cylinder 6 and the horizontal plane is larger than the repose angle of the conveyed powder, and can be specifically selected according to actual needs.

In the conveying cylinder 6, a main screw 5 is rotatably fitted coaxially through a bearing, the main screw 5 also extending obliquely downward from back to front, the main screw 5 serving to convey the powder fed from the feed passage 12 to the filling pipe 9. The rear part of the conveying cylinder 6 is provided with a speed reducer 2, and the speed reducer 2 is fixedly arranged at the rear end of the conveying cylinder 6 through a flange supporting structure 4. The first motor 13 is installed to the side support of speed reducer 2, and servo motor is specifically adopted to first motor 13, and the power take off shaft of first motor 13 is perpendicular to fore-and-aft direction to be arranged, and the power take off shaft of first motor 13 passes through bevel gear transmission structure drive main screw rod 5 forward rotation to the powder is carried forward, and the bevel gear transmission structure of here is used for realizing the switching-over transmission between first motor 13 and the main screw rod 5.

For the problem of low speed of powder conveying of the main screw 5, in this embodiment, as shown in fig. 2, 3 and 5, a worm wheel casing 16 is fixedly arranged on the upper side of the conveying cylinder 6, an inner cavity of the worm wheel casing 16 is communicated with an inner cavity of the conveying cylinder 6 and a feeding cavity 121 of the feeding channel, a blocking worm wheel 17 is rotationally assembled in the worm wheel casing 16, the blocking worm wheel 17 is located above the main screw 5, a central axis of the blocking worm wheel 17 is vertically arranged with a central axis of the main screw 5, the vertical direction is perpendicular to the different surface, the blocking worm wheel 17 is provided with worm wheel teeth extending along the circumferential direction, and worm wheel teeth of the blocking worm wheel are correspondingly meshed with the main screw, so that the main screw 5 drives the blocking worm wheel 17 to rotate. In addition, in the front-rear direction, the meshing position of the worm gear teeth of the material blocking worm wheel 17 and the main screw 5 is positioned at the front side of the feeding cavity 121 of the feeding channel 12, so that the worm gear teeth extending into the spiral groove of the main screw 5 can block powder in the spiral groove of the main screw from rotating along with the main screw 5, the acting force exerted by the main screw on the powder is completely concentrated in the forward direction, the powder cannot rotate along with the main screw to weaken the forward action, and further higher filling pressure can be established.

In the present embodiment, the thickness of the worm wheel housing 16 is smaller than the thickness of the feed passage 12 in the circumferential direction of the conveying cylinder, corresponding to the smaller-thickness worm wheel. The rear side of the worm wheel shell 16 is fixedly arranged on the front side surface of the feeding channel 12, the extending direction of the central axis of the material blocking worm wheel is defined as the left-right direction, the worm wheel shell 16 is provided with two side walls positioned on the left side and the right side of the material blocking worm wheel, the two side walls are in clearance fit with corresponding end faces of the material blocking worm wheel 17 in the left-right direction, the clearance ensures that the material blocking worm wheel rotates normally, the outer sides of the two side walls of the worm wheel shell, which are opposite to the material blocking worm wheel, are respectively provided with a supporting shaft sleeve 19, the material blocking worm wheel 17 is coaxially and fixedly provided with a wheel shaft 18, the wheel shaft 18 is provided with two side shaft sections penetrating into the two side supporting shaft sleeves 19, and the two side shaft sections are correspondingly assembled in the supporting shaft sleeves on the two sides through bearing structures in a rotating mode, so that the material blocking worm wheel is assembled in the worm wheel shell 16 in a rotating mode.

It should be noted that, the clearance fit here refers to that the corresponding side wall of the worm wheel casing and the corresponding end face clearance of the material blocking worm wheel are smaller, the material blocking worm wheel is guaranteed to normally rotate, and the worm wheel casing can be thinner corresponding to the material blocking worm wheel with smaller thickness.

The material blocking worm wheel 17 mainly plays a role in blocking powder to establish filling pressure, power and motion do not need to be output, and the thickness of the worm wheel ensures that worm wheel teeth are not deformed. For more powder conveying, on the premise of ensuring the self strength of the material blocking worm wheel 17, the axial thickness of the material blocking worm wheel 17 is as small as possible, the number of heads of the main screw 5 is as small as possible, the modulus is as large as possible, the number of heads of the main screw 5 is 1-4, and the thickness of the material blocking worm wheel 17 is larger than 1 mm. In the embodiment, the number of heads of the main screw 5 is 1, the number of worm gear teeth of the material blocking worm gear 17 is 8, and the thickness of the worm gear of the material blocking worm gear 17 is 20 mm.

The inner cavity of the worm wheel housing 16 is communicated with the inner cavity of the conveying cylinder 6 and the feeding cavity 121 of the feeding channel 12, so that part of worm wheel teeth on the rear side of the material blocking worm wheel 17 extend into the feeding cavity 121, and part of worm wheel teeth on the front side of the material blocking worm wheel are positioned on the front side of the feeding channel 12.

In addition, in the case of the wheel axle, a wheel axle sealing structure 20 is provided between the wheel axle 18 and the support shaft sleeve 19, and a balance ventilation hole 21 is provided in the support shaft sleeve 19.

In this embodiment, as shown in fig. 3 and fig. 4, the front part of the conveying cylinder 6 is provided with a powder collecting cone 8, the powder collecting cone 8 is positioned at the front side of the meshing position of the worm gear teeth of the blocking worm wheel 17 and the main screw 5, the front end discharge port of the powder collecting cone 8 forms the discharge port of the conveying cylinder 6, the radial dimension of the powder collecting cone 8 gradually decreases from back to front, a boiling head 10 is arranged in the powder collecting cone 8, the boiling head 10 is positioned between the front end of the main screw 5 and the filling pipe 9, and the filling pipe 9 is correspondingly welded and fixed at the conical tip position of the powder collecting cone 8.

For normal mounting and driving of the boiling head 10 to rotate, the main screw 5 has a cavity extending in the front-rear direction in which an inner driving shaft 3 is rotatably fitted through a corresponding bearing structure, the front end of the inner driving shaft 3 projects forward from the front end of the main screw 5, and the boiling head 10 is correspondingly fixedly mounted at the front end of the inner driving shaft 3, so that the front end of the inner driving shaft 3 is in driving connection with the boiling head 10, and so that the boiling head 10 is rotatably fitted coaxially at the front end of the main screw 5 through the inner driving shaft 3, the boiling head 10 having stirring blades 102 for stirring the powder accumulated in the powder accumulating cone when the boiling head 10 rotates.

In this embodiment, as shown in fig. 3 and 4, the rear end of the inner driving shaft 3 extends backward to penetrate through the corresponding speed reducer 2, and is in transmission connection with the power output shaft of the second motor 1 through the coupling 14, the second motor 1 is used as a stirring driving device to drive the inner driving shaft 3 to rotate, so as to further realize rotation of the boiling head 10, and the second motor 1 is correspondingly supported and installed at the rear side of the speed reducer 2, and specifically a servo motor is also adopted. The second motor 1 and the first motor 13 are arranged vertically in a relatively crossed mode and are all installed on the speed reducer 2, so that the whole structure is compact and reasonable, the two motors are servo motors, and accurate control on powder conveying is conveniently achieved.

In particular, since the powder is supplied everywhere in the conveying cylinder 6, the working environment is severe, and a front end seal 15 is provided between the front end of the inner drive shaft 3 and the front end of the main screw in order to reduce wear.

In the powder filling machine, the rotating speed of the main screw 5 is relatively low, but the inner diameter of the conveying cylinder 6 is relatively large, the conveying section is large, the inner diameter of the filling pipe 9 is relatively small, the rotating speed of the boiling head 10 can be larger than that of the main screw 5, the higher rotating speed is matched at the boiling head 10, the flow consistency of powder conveying is realized, and the condition that the motor is blocked or the current is increased due to powder accumulation is reduced. Meanwhile, in order to further improve the boiling effect of the stirred powder, the rotation direction of the boiling head 10 is opposite to the rotation direction of the main screw 5.

In this embodiment, as shown in fig. 4 and 7, the boiling head 10 includes a base 101, the base 101 is fixedly assembled with the front end of the inner driving shaft 3, and the stirring blades 102 are mounted on the base 101, and the stirring blades 102 gradually extend from back to front along the circumferential direction of the boiling head for applying a forward pushing force to the powder during rotation, and the outer diameter of the stirring blades 102 gradually decreases from back to front, corresponding to the powder collecting cone 8, where the stirring blades 102 are specifically a constant pitch cone spiral structure.

The boiling head 10 likewise extends obliquely from back to front, with a spiral inclination smaller than the repose angle of the powder. In addition, the front ends of the stirring blades 102 extend into the filling pipe 9, so that powder can be broken to form arch materials at the inlet of the filling pipe 9 during rotation.

Moreover, a gap is reserved beside the stirring blade 102 corresponding to the center of the boiling head 10, so that the boiling head 10 forms a hollow boiling head, the radial dimension of the hollow part is smaller than the inner diameter of the filling pipe 9, the hollow part also has small resistance to the central flow, and the blades of the spiral structure have a certain pushing effect on the powder on the inner conical surface, so that the cost performance is higher. The whole boiling head 10 can drive powder to rotate to achieve the boiling effect, improves the flow characteristic of the powder, improves the flow effect, and can avoid powder accumulation without introducing compressed air.

In fact, for the powder collecting cone 8 having a conical structure, the filling pipe 9 is directly welded to the front end of the powder collecting cone 8, and the bottom of the filling pipe 9 and the bottom of the powder collecting cone 8 are butted straight in the front-rear direction, both extending in the horizontal direction. Compared with the mode of connecting the filling pipes by adopting the corrugated rubber pipe, the mode of directly and straightly abutting the filling pipes 9 by adopting the powder collecting cone 8 is more beneficial to powder flowing, and the powder filling efficiency can be effectively improved.

When the feeding device is used, powder in the hopper enters the conveying cylinder 6 through the feeding cavity 121 of the feeding channel 12, the main screw 5 rotates to convey the powder forwards, worm gear teeth on the material blocking worm wheel 17 are matched with the spiral groove of the main screw 5, and the powder in the spiral groove is blocked from rotating and sliding along with the main screw 5, so that higher filling pressure is conveniently established. Meanwhile, the boiling head 10 is arranged at the front part of the conveying cylinder 6, when the main screw 5 rotates forwards to convey powder, the inner driving shaft 3 drives the boiling head 10 to rotate reversely, the stirring blades 102 stir the powder, so that the powder is in a boiling state, a high-speed stable powder flow is formed under the filling pressure, the powder can be filled into a corresponding valve pocket at a high speed in a compact way without introducing compressed air, dust generated when the powder is filled into the valve pocket is reduced, and the purposes of high-efficiency filling and environmental protection are achieved.

Specific example 2 of the powder filling machine provided by the utility model:

the main difference from the embodiment 1 is that: in example 1, the stirring blade of the boiling head had a constant pitch conical spiral structure. In this embodiment, as shown in fig. 8, the boiling head 10 also includes a base 101, the base 101 is fixedly assembled with the front end of the inner driving shaft, the stirring blade 102 is mounted on the base 101, the stirring blade 102 is a helical blade, the helical blade extends along a logarithmic spiral line, the helical blade gradually extends along the circumferential direction of the boiling head from back to front, and the outer diameter dimension of the helical blade gradually becomes smaller from back to front to correspond to the inner surface of the conical powder collecting cone.

The two spiral blades are symmetrically arranged about the central axis of the boiling head, and a gap is reserved at the position of the central axis of the boiling head, corresponding to the side of the spiral blade, so that the boiling head forms a hollow boiling head.

Under the pressure effect of the boiling head, the powder is attached to the inner surface of the conical powder collecting cone, the spiral blade extending along the logarithmic spiral line can drive the powder to move towards the cone tip direction of the powder collecting cone at a constant pressure angle, and for the powder with a pressure-sensitive effect, the spiral blade is a good choice, so that the powder is not easy to extrude and agglomerate in the gradual forward moving process. In addition, the boiling head forms a hollow boiling head, and the hollow structure can enable powder in the center of the spiral to advance at a speed exceeding the conical surface under the action of feeding thrust. It is possible to achieve an effect in which the powder flow ratio is made to be similar to that of the viscous fluid.

Specific example 3 of the powder filling machine provided by the utility model:

the differences from example 2 are mainly that: in example 2, the center of the boiling head was hollow to form a hollow boiling head structure. In this embodiment, as shown in fig. 9, for the double-bladed helical blade, the boiling head 10 is provided with a central column 103 at the central axis position of the boiling head, the central column 103 extends along the front-back direction, the central column 103 is a cone gradually decreasing from back to front, and the two helical blades are circumferentially arranged on the outer peripheral surface of the central column 103, so that when the situation that high-speed rotation is required, the central column 103 can effectively enhance the overall strength of the boiling head 10, and the rotation flutter tendency is small.

In other embodiments, the center column may be a cylindrical structure, which also serves to enhance the strength of the boiling head.

Here, set up the center post on the boiling head for the boiling head has certain bending deformation resistance ability, and bulk strength is higher, also convenient preparation.

It should be noted that for examples 2 and 3, there are two stirring blades extending along a logarithmic spiral on the boiling head. In other embodiments, only a single spiral blade extending along a logarithmic spiral on the base of the boiling head may be provided, resulting in a single-blade spiral structure, which is advantageous in that symmetry is not a concern during manufacture, and in that the cost is low.

In addition, for the boiling head provided with the single spiral blade, the base can enable the intensity of the boiling head to be better, and according to actual needs, a central column can be arranged at the position of the central axis of the boiling head, the central column extends along the front-back direction, the central column is a cylinder or a cone gradually decreasing from back to front, and the single spiral blade is arranged on the peripheral surface of the central column in a surrounding mode.

The center column can be omitted according to actual needs. At this time, a gap is reserved at the side of the boiling head corresponding to the spiral blade at the central axis of the boiling head, so that the boiling head forms a hollow boiling head, the central resistance of powder with good fluidity is smaller, and the main screw applies pressure to the powder, thereby being more convenient for converting the pressure into the powder speed at the gap seen from the center.

Specific example 4 of the powder filling machine provided by the utility model:

the differences from example 1 are mainly that: in example 1, the stirring blade of the boiling head had a constant pitch conical spiral structure. In this embodiment, as shown in fig. 10, the boiling head 10 includes a base 101, the base 101 is also fixedly assembled with the inner driving shaft 3, three blades 104 are uniformly distributed on the base 101 along the circumferential direction of the base, the blades 104 form corresponding stirring blades, each blade 104 is a straight blade extending in the front-rear direction, the outer side 1041 of each blade 104 extends obliquely inwards from rear to front, so that the outer side 1041 of all the blades 104 is in the same conical surface, and a gap is left at the position of the central axis of the boiling head, corresponding to the side of the blade 104, of the boiling head 10, so that the boiling head 10 forms a hollow boiling head.

In addition, in order to enlarge the gap in the center, the inner side 1042 of each scraper 104 gradually extends outwards from front to back, so that the three scrapers 104 enclose a structure with a small front opening and a large rear belly, the front opening is small so as to facilitate the top of the boiling head 10 to enter the filling pipe 9, and the rear belly is large so as to facilitate the accommodation of more powder to pass through and improve the powder flowability.

The scraper 104 is a straight scraper, mainly plays a role in boiling powder by rotating and stirring, and also plays a role in scraping the inner surface of the powder collecting cone, and does not have a function of applying force to the conveying direction of the powder.

In the embodiment, three flat scraping plates are uniformly distributed on the base along the circumferential powder collecting cone. In other embodiments, two flat scrapers may be symmetrically disposed on the base, and of course, more than four scrapers may be uniformly distributed on the base along the circumferential direction of the base according to actual needs.

Specific example 5 of the powder filling machine provided by the utility model:

the differences from example 1 are mainly that: in embodiment 1, support shaft sleeves are respectively arranged on the outer side surfaces of the left and right side walls of the worm wheel casing, and serve as bearing seats for rotationally assembling corresponding wheel shafts through bearing structures so as to realize the rotational assembly of the material blocking worm wheel. In this embodiment, the supporting shaft sleeve can be omitted, and at this time, the thicknesses of the side walls on the left and right sides of the worm wheel housing can be thickened to form corresponding bearing seats.

Specific example 6 of the powder filling machine provided by the utility model:

the differences from example 1 are mainly that: in the embodiment 1, the powder collecting cone at the front part of the conveying cylinder body is a conical section, so that the powder collecting cone is conveniently matched with the rotary boiling head. In this embodiment, the powder collecting cone may also have a pyramid structure, or an arc transition structure with an arc cross section edge, without affecting the rotation of the boiling head.

Specific example 7 of the powder filling machine provided by the utility model:

the differences from example 1 are mainly that: in example 1, the tip of the powder-collecting cone was welded with a filler tube. In this embodiment, the front end of the powder collecting cone may also be fixedly provided with a filling pipe through a flange connection structure, and at this time, the filling pipe may be arranged opposite to the central axis of the conical powder collecting cone, and at this time, the bottom of the filling pipe is no longer in flat butt joint with the bottom of the powder collecting cone in the front-rear direction.

Specific example 8 of the powder filling machine provided by the utility model:

the differences from example 1 are mainly that: in embodiment 1, the whole conveying cylinder body is obliquely extended from back to front, and a proper inclination angle is selected, so that the bottom of the conical powder collecting cone is extended along the horizontal direction, and the bottom of the filling pipe is also extended along the horizontal direction, and the bottom of the filling pipe and the bottom of the powder collecting cone are conveniently and flatly butted in the front-back direction. In the embodiment, the bottom of the conical powder collecting cone can also be inclined from back to front and extend downwards, the filling pipe can also be inclined from back to front, the inclination angle and the mounting position of the filling pipe are designed, the bottom of the filling pipe and the bottom of the powder collecting cone can be ensured to be in straight butt joint in the front-back direction, and the powder flowability is ensured.

Specific example 9 of the powder filling machine provided by the utility model:

the differences from example 1 are mainly that: in embodiment 1, the boiling head is directly and fixedly arranged at the front end of the inner driving shaft, so that the inner driving shaft and the boiling head can be in transmission connection. In the embodiment, the boiling head can be directly rotationally assembled at the front end of the main screw rod through the bearing structure, and the front end of the inner driving shaft can be in transmission connection with the base of the boiling head through the spline connection structure.

The utility model provides a concrete embodiment 10 of a powder filling machine:

the differences from example 1 are mainly that: in example 1, the direction of rotation of the boiling head was opposite to the direction of rotation of the main screw, and the boiling head rotational speed was greater than the main screw rotational speed. In this embodiment, the rotation direction of the boiling head may be the same as the rotation direction of the main screw, and the rotation speed may be the same as the rotation speed of the main screw. In the concrete implementation, the steering and the rotating speed of the boiling head can be timely adjusted by utilizing the servo motor according to actual needs.

Specific example 11 of the powder filling machine provided by the utility model:

the differences from example 1 are mainly that: in embodiment 1, a first motor and a second motor are installed on the speed reducer, the first motor drives the main screw to rotate through a bevel gear transmission structure, and the second motor correspondingly drives the inner driving shaft to rotate through a coupler. In this embodiment, the first motor may drive the main screw to rotate through the spur gear transmission structure, at this time, a gear ring may be disposed outside the main screw, a power output shaft of the first motor is a gear shaft, the gear shaft is in meshed transmission connection with the gear ring, the second motor may also drive the inner driving shaft to rotate through the spur gear transmission structure, at this time, a driven gear is fixedly mounted at a rear end of the inner driving shaft, and a driving gear is mounted on a power output shaft of the second motor.

Specific example 12 of the powder filling machine provided by the utility model:

the differences from example 1 are mainly that: in embodiment 1, the worm wheel housing is located on the upper side of the main screw. In this embodiment, the worm gear housing may also be located horizontally beside the main screw, as may the flitch worm gear.

Specific example 13 of powder filling machine provided by the utility model:

the differences from example 1 are mainly that: in example 1, the inner cavity of the worm wheel casing is communicated with the feeding channel, and at this time, part of worm gear teeth on the rear side of the material blocking worm wheel extend into the feeding channel. In this embodiment, the worm gear housing can also be arranged separately from the feed channel, the worm gear housing being arranged completely independently of the feed channel front side, the material blocking worm gear no longer extending into the feed channel.

The powder filling machine provided by the embodiment can be used for filling powder into the valve bag, and the filling pipe is inserted into the valve bag during filling, and of course, the powder filling machine can also be used for filling powder into other types of powder packaging bags such as open bags.

It should be noted that the above description is only a preferred embodiment of the present utility model, and the present utility model is not limited to the above embodiment, but may be modified without inventive effort or equivalent substitution of some technical features thereof by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A powder filling machine comprising:

a frame (7), wherein a conveying cylinder (6) is arranged on the frame (7);

the conveying cylinder body (6) obliquely extends downwards from back to front, a feed inlet is arranged at the upper end of the conveying cylinder body (6), a feed channel (12) is arranged at the upper part of the feed inlet, the feed channel (12) is provided with a feed cavity (121) for feeding into the conveying cylinder body (6), and a discharge outlet is arranged at the front end of the conveying cylinder body (6) and used for filling powder into corresponding packaging bags;

the main screw (5) is coaxially and rotatably assembled in the conveying cylinder (6) and is used for conveying powder forwards during forward rotation;

the novel material blocking device is characterized in that a worm wheel shell (16) is arranged on the conveying cylinder body (6), an inner cavity of the worm wheel shell (16) is communicated with an inner cavity of the conveying cylinder body (6), a material blocking worm wheel (17) is rotationally assembled in the worm wheel shell (16), a central axis of the material blocking worm wheel (17) is perpendicular to a central axis of the main screw (5), the material blocking worm wheel (17) is provided with worm wheel teeth extending along the circumferential direction, and the material blocking worm wheel (17) is correspondingly meshed with the main screw (5) so that the main screw (5) drives the material blocking worm wheel (17) to rotate;

in the front-rear direction, the meshing position of worm gear teeth of a material blocking worm gear (17) and a main screw (5) is positioned in front of the feeding cavity (121), so that the worm gear teeth extending into the spiral groove of the main screw (5) block powder in the spiral groove from rotating along with the main screw (5) to establish filling pressure.

2. Powder filling machine according to claim 1, characterized in that the worm gear housing (16) and the material blocking worm gear (17) are located on the upper side of the main screw (5).

3. The powder filling machine according to claim 2, characterized in that the inner cavity of the worm wheel housing (16) communicates with the feed cavity (121) of the feed channel (12), that the part worm wheel teeth of the blocking worm wheel (17) on the rear side extend into the feed cavity (121), and that the part worm wheel teeth of the blocking worm wheel (17) on the front side are on the front side of the feed channel (12).

4. A powder filling machine according to claim 3, characterized in that the thickness of the worm wheel housing (16) is smaller than the thickness of the feed channel (12) in the circumferential direction of the conveying cylinder.

5. A powder filling machine according to claim 3, characterized in that the rear side of the worm wheel housing (16) is fixedly arranged on the front side surface of the feeding channel (12), the extending direction of the central axis of the material blocking worm wheel (17) is defined as the left-right direction, the worm wheel housing (16) is provided with two side walls positioned at the left side and the right side of the material blocking worm wheel (17), the two side walls are in clearance fit with corresponding end faces of the material blocking worm wheel (17) in the left-right direction, the outer sides of the two side walls, which are opposite to the material blocking worm wheel (17), are respectively provided with a supporting shaft sleeve (19), the material blocking worm wheel (17) is coaxially fixedly provided with a wheel shaft (18), the wheel shaft (18) is provided with two side shaft sections penetrating into the supporting shaft sleeves (19) at the two sides, and the two side shaft sections are correspondingly assembled in the supporting shaft sleeves (19) at the two sides through bearing structures in a rotating way.

6. Powder filling machine according to any one of claims 1 to 5, characterized in that the front part of the conveying cylinder (6) is provided with a powder collecting cone (8), the powder collecting cone (8) is positioned at the front side of the engagement position of the worm gear teeth of the material blocking worm wheel (17) and the main screw (5), the front end discharge hole of the powder collecting cone (8) forms the discharge hole of the conveying cylinder (6), the radial dimension of the powder collecting cone (8) is gradually reduced from back to front, a boiling head (10) is arranged in the powder collecting cone (8), the boiling head (10) is coaxially and rotatably assembled at the front end of the main screw (5), and the boiling head (10) is provided with stirring blades (102) for stirring powder extruded in the powder collecting cone (8) when the boiling head (10) rotates;

the main screw (5) is provided with a cavity extending along the front-back direction, an inner driving shaft (3) is rotationally assembled in the cavity, the rear end of the inner driving shaft (3) is in transmission connection with a stirring driving device, the front end of the inner driving shaft (3) is in transmission connection with the boiling head (10), so that the stirring driving device drives the boiling head (10) to rotate through the inner driving shaft (3), and a front end sealing structure (15) is arranged between the front end of the inner driving shaft (3) and the front end of the main screw (5).

7. The powder filling machine according to claim 6, wherein the stirring blade (102) extends in the front-rear direction, and the outer diameter dimension of the stirring blade (102) gradually decreases from rear to front.

8. The powder filling machine according to claim 7, wherein the stirring blades (102) are helical blades extending in the front-rear direction in the axial direction or straight blades extending in the front-rear direction, and at least two straight blades are uniformly distributed at intervals along the circumferential direction of the boiling head (10).

9. Powder filling machine according to claim 7, characterized in that the front end of the powder collecting cone (8) is welded with a filling tube (9), which filling tube (9) extends forward for insertion into the respective packaging bag, the bottom of the filling tube (9) and the bottom of the powder collecting cone (8) being in straight butt joint in the front-rear direction.

10. Powder filling machine according to claim 9, characterized in that the front ends of the stirring blades (102) of the boiling head (10) extend forward into the filling tube (9).