CN113697140A

CN113697140A - Powder filling machine

Info

Publication number: CN113697140A
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: 2021-11-26
Anticipated expiration: 2041-08-31
Also published as: CN113697140B

Abstract

The invention relates to a powder filling machine, which comprises a conveying cylinder and a spiral conveying groove, wherein a main screw is coaxially and rotatably assembled in the conveying cylinder, a worm gear shell is arranged on the conveying cylinder, the inner cavity of the worm gear shell is communicated with the inner cavity of the conveying cylinder, a material blocking worm gear is supported and assembled in the worm gear shell, the central axis of the material blocking worm gear is vertical to the central axis of the main screw, the material blocking worm gear is correspondingly and spirally matched with the main screw, so that the main screw drives the material blocking worm gear to rotate, in the front and back directions, the meshing position of worm gear teeth of the material blocking worm gear and the main screw is positioned in front of a feeding cavity, so that powder extending into a spiral groove of the main screw is blocked by the worm gear teeth to rotate along with the main screw, so as to establish filling pressure, accelerate the forward movement of the powder, improve the filling speed, no high-pressure air needs to be mixed, realize dense and high-speed filling of the powder into a valve pocket, and reduce dust generated when the valve powder is filled into the valve pocket, achieving the purposes of high-efficiency filling and environmental protection.

Description

Powder filling machine

Technical Field

The invention relates to a powder filling machine.

Background

At present, the packing machines for filling powder valve bags in the dry powder mortar industry in the market have structures of an air floating type, a centrifugal type, a screw type and the like, wherein the air floating type and centrifugal type valve bag packing machines are required to mix compressed air in powder of a filling pipe so as to improve the flowing performance of dry powder. The filling speed of dry powder can be improved to the compressed air who mixes, but the powder can get into the valve port bag with compressed air together, after filling the completion, still need discharge the compressed air in the bag, and in fact, compressed air is difficult to discharge in the bag, leads to the closely knit degree of powder can not satisfy the user demand in the bag, and moreover, exhaust compressed air can carry the dust, has increased dust collecting equipment's load.

Screw packagine machine adopts the screw rod to carry the powder, like the utility model discloses a powdery material valve pocket quantitative filling machine that the grant bulletin number is CN2542563Y, include the drum that inclines downwardly extending backward forward, the drum upside sets up the feed inlet, and the front end sets up the discharge gate, and the upside of drum corresponds feed inlet department and installs the hopper, and coaxial arrangement has the auger in the drum, and the auger is rotated by the actuating mechanism drive that is located the rear end, and when the auger forward rotated, with the powder forward transport, discharge through the discharge gate to fill the powder to the valve pocket. The screw type packaging machine has simple structure, convenient control and wide application. However, the screw type packing machine does not need to pressurize the compressed air when filling the powder, but the filling speed is slow, which does not meet the needs of users, if the compressed air is introduced, although the filling speed of the dry powder is obviously increased, after the powder is filled into the bag, the air in the bag needs to be discharged, and the problems that the air is difficult to discharge and the load of the dust removing equipment is increased exist.

Disclosure of Invention

The invention aims to provide a powder filling machine, which aims to solve the technical problem that a screw type packaging machine in the prior art is low in filling speed.

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

the device comprises a rack, a conveying cylinder body and a conveying mechanism, wherein the conveying cylinder body is arranged on the rack;

the conveying cylinder is inclined forwards from back to front and extends downwards, a feeding hole is formed in the upper end of the conveying cylinder, a feeding channel is arranged at the upper part of the feeding hole and has a feeding cavity for feeding materials into the conveying cylinder, and a discharging hole is formed in the front end of the conveying cylinder and is used for filling powder into a corresponding packaging bag;

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

a worm wheel shell is arranged on the conveying cylinder, the inner cavity of the worm wheel shell is communicated with the inner cavity of the conveying cylinder, a material blocking worm wheel is assembled in the worm wheel shell in a rotating mode, the central axis of the material blocking worm wheel is perpendicular to the central axis of the main screw rod, 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 rod so that the main screw rod drives the material blocking worm wheel to rotate;

in the front-back direction, the meshing position of the worm gear teeth of the material blocking worm gear and the main screw rod is positioned in front of the feeding cavity, so that the worm gear teeth extending into the spiral groove of the main screw rod block the powder in the spiral groove to rotate along with the main screw rod, and the filling pressure is established.

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

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

The beneficial effects are that: worm wheel shell and keep off the material worm wheel and be located the main screw rod upside, combine the main screw rod that the slope was arranged, conveniently carry out inside clearance.

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

The beneficial effects are that: part of the worm gear teeth of the material blocking worm gear positioned at the rear side extend 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 shell is smaller than that of the feeding channel in the circumferential direction of the conveying cylinder.

The beneficial effects are that: the thickness of worm wheel shell is less relatively, and the worm wheel shell dead weight is less, and the team is carried barrel pressure little, and simultaneously, manufacturing cost is also lower relatively.

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

The beneficial effects are that: utilize the supporting axle sleeve in the worm wheel shell left and right sides wall outside to correspond the shaft that supports the fender material worm wheel, simultaneously, clearance fit between the left and right sides wall of worm wheel shell and the corresponding terminal surface that keeps off the material worm wheel left and right sides, so, under the circumstances of guaranteeing normal assembly, conveniently form narrower worm wheel shell.

As a further improvement, the front part of the conveying cylinder is provided with a powder gathering cone which is positioned on the front side of the meshing position of the worm gear teeth of the material blocking worm gear and the main screw rod, a front end discharge port of the powder gathering cone forms a discharge port of the conveying cylinder, the radial dimension of the powder gathering cone is gradually reduced from back to front, a boiling head is arranged in the powder gathering cone and coaxially and rotatably assembled at the front end of the main screw rod, and the boiling head is provided with stirring blades for stirring powder extruded in the powder gathering cone when the boiling head rotates; the main screw rod is provided with a cavity extending in the front-back direction, an inner driving shaft is assembled in the cavity in a rotating mode, the rear end of the inner driving shaft is connected with a stirring driving device in a transmission mode, the front end of the inner driving shaft is connected with a boiling head in a transmission mode, so that the stirring driving device drives the boiling head to rotate through the inner driving shaft, and a front end sealing structure is arranged between the front end of the inner driving shaft and the front end of the main screw rod.

The beneficial effects are that: the front end of the conveying cylinder is provided with the powder gathering cone, the boiling head is arranged in the powder gathering cone, and in the rotating process of the boiling head, the powder can be stirred by the aid of the stirring blades to form a boiling state, so that the powder flowing performance is improved, high-speed stable powder flow is conveniently formed under the filling pressure, and the powder filling speed is effectively increased.

As a further improvement, the agitating blades extend in the front-rear direction, and the outer diameter dimension of the agitating blades gradually becomes smaller from the rear to the front.

The beneficial effects are that: the outer diameter of the stirring blades is gradually reduced from back to front, so that the periphery of the stirring blades forms a virtual cone, and the stirring blades are convenient to match with the powder gathering cone.

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

As a further improvement, the front end of the powder gathering cone is welded with a filling pipe, the filling pipe extends forwards and is used for being inserted into a corresponding packaging bag, and the bottom of the filling pipe is in straight butt joint with the bottom of the powder gathering cone 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 gathering cone, so that the resistance is small, and the powder flowability can be improved.

As a further improvement, the front end of the stirring blade of the boiling head extends forward into the filling pipe.

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 phenomenon that the powder is arched in the filling pipe is effectively avoided.

Drawings

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

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

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

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

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

FIG. 6 is a schematic view of the powder filling machine of FIG. 1 from 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 embodiment 2 of the powder filling machine according to the present invention;

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

FIG. 10 is a schematic structural view of a boiling head in embodiment 4 of the powder filling machine according to the present invention.

Description of reference numerals:

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. aggregating powder cones; 9. a fill tube; 10. a boiling head; 101. a base; 102. agitating the blades; 103. a central column; 104. a squeegee; 1041. an outer side surface; 1042. an inner side surface; 11. a hopper; 12. a feed channel; 121. a feed cavity; 13. a first motor; 14. a coupling; 15. a front end sealing structure; 16. a worm gear case; 17. a material blocking worm wheel; 18. a wheel axle; 19. a support sleeve; 20. a wheel axle sealing structure; 21. and (5) balancing the air holes.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention 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 present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that relational terms such as "first" and "second," and the like, may be 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. Also, 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, elements recited by the phrase "comprising an … …" do not exclude the inclusion of such elements in processes or methods.

In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" when they are used are to be construed broadly, e.g., as meaning a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, or may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art from specific situations.

In the description of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the term "provided" may be used in a broad sense, for example, the object of "provided" may be a part of the body, or may be arranged separately from the body and connected to the body, and the connection may be a detachable connection or a non-detachable connection. The specific meaning of the above terms in the present invention can be understood by those skilled in the art from specific situations.

The present invention will be described in further detail with reference to examples.

The specific embodiment 1 of the powder filling machine provided by the invention is as follows:

as shown in fig. 1 to 7, in the powder filling machine provided by this embodiment, discharge port department at the front end of conveying cylinder 6 is provided with filling tube 9, be used for filling the powder to the valve bag, install main screw 5 in the conveying cylinder 6, main screw 5 is used for carrying the powder forward, it stops material worm wheel 17 to dispose corresponding main screw 5, it stops material worm wheel 17 and main screw 5 and corresponds spiral cooperation, make main screw 5 drive to keep off material worm wheel 17 and rotate, the worm wheel teeth that keeps off material worm wheel 17 stretches into in order to block the powder in the spiral groove of main screw 5, prevent that the powder from following the spiral groove gyration, guarantee that the main screw can effectively push away the powder forward, and then establish filling pressure.

In addition, because 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, the boiling head 10 is arranged in the powder gathering cone 8 at the front part of the conveying cylinder 6, the boiling head 10 and the main screw 5 are coaxially and rotatably assembled, the powder is stirred by the stirring blade 102 on the boiling head 10, so that the powder is in a boiling state, a high-speed and stable powder flow is conveniently formed under the filling pressure, the powder can be densely filled in the valve bag at a high speed under the condition of no compressed air mixing, the dust generated when the powder is filled in the valve bag 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, a feed inlet is arranged at the upper end of the conveying cylinder 6, the feed inlet is communicated with a hopper 11 through a feed channel 12, and the feed channel 12 is provided with a feed cavity 121 for feeding materials into the conveying cylinder. A filling pipe 9 is arranged at a discharge port at the front end of the conveying cylinder body 6, and the axis of the filling pipe is horizontally arranged. In order to reduce the dust, the filling pipe 9 extends into the valve bag to be filled with powder, and the outer diameter of the filling pipe 9 is smaller, so that the inner diameter of the filling pipe 9 is also smaller, and is usually smaller than that of the conveying cylinder 6.

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

A main screw 5 is coaxially rotatably fitted in the conveying cylinder 6 through a bearing, the main screw 5 also extending downward from the rear to the front, the main screw 5 serving to convey the powder sent from the feed passage 12 to the filling pipe 9. The rear part of the conveying cylinder body 6 is provided with a speed reducer 2, and the speed reducer 2 is fixedly arranged at the rear end of the conveying cylinder body 6 through a flange supporting structure 4. The side support of speed reducer 2 is installed first motor 13, and first motor 13 specifically adopts servo motor, and the power output shaft of first motor 13 is arranged perpendicularly to fore-and-aft direction, and the power output shaft of first motor 13 drives the main screw 5 forward rotation through the bevel gear transmission structure to carry the powder forward, and the bevel gear transmission structure here is used for realizing the switching-over transmission between first motor 13 and main screw 5.

For the problem that main screw 5 carried the powder low-speed, in this embodiment, as shown in fig. 2, fig. 3 and fig. 5, worm wheel shell 16 has set firmly at the transport barrel 6 upside, the inner chamber of worm wheel shell 16 and the inner chamber of transport barrel 6, feedstock channel feed cavity 121 intercommunication, 16 internal rotations of worm wheel shell are equipped with and keep off material worm wheel 17, keep off material worm wheel 17 and be located main screw 5 top, the central axis of keeping off material worm wheel 17 is arranged perpendicularly with the central axis of main screw 5, the perpendicular of here is the antarafacial perpendicularly, it has the worm wheel teeth that extend along circumference to keep off material worm wheel 17, the worm wheel teeth of keeping off material worm wheel correspond the meshing with main screw for main screw 5 drives and keeps off material worm wheel 17 and rotates. In addition, in the front-rear direction, the meshing position of the worm gear teeth of the material blocking worm gear 17 and the main screw 5 is positioned in 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 prevent powder in the spiral groove of the main screw from rotating along with the main screw 5, the acting force applied by the main screw to the powder is completely concentrated in the forward direction, the powder cannot rotate along with the main screw to weaken the forward action, and then higher filling pressure can be established.

In the present embodiment, the thickness of the worm wheel housing 16 is smaller than that of the feeding channel 12 in the circumferential direction of the conveying cylinder corresponding to the smaller thickness of the striker worm wheel. The rear side of worm wheel shell 16 sets firmly on the front side of feedstock channel 12, the central axis extending direction that will keep off the material worm wheel defines left right direction, worm wheel shell 16 has the both sides wall that is located the fender material worm wheel left and right sides, both sides wall and the corresponding terminal surface clearance fit in the left and right sides direction of keeping off material worm wheel 17, this clearance guarantee keep off the material worm wheel normal gyration can, be provided with supporting axle sleeve 19 respectively in the outside of keeping off the material worm wheel of the both sides wall of worm wheel shell dorsad, the coaxial shaft 18 that has set firmly on keeping off the material worm wheel 17, shaft 18 has the both sides shaft section that penetrates in both sides supporting axle sleeve 19, both sides shaft section corresponds rotates the assembly in the supporting axle sleeve of both sides through bearing structure, so that keep off the material worm wheel and rotate the assembly in worm wheel shell 16.

It should be particularly noted that, in the clearance fit, the clearance between the corresponding side wall of the worm gear shell and the corresponding end face of the material blocking worm gear is small, so that the material blocking worm gear can normally rotate, and the worm gear shell can be thinner corresponding to the material blocking worm gear with smaller thickness.

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

It should be noted that the inner cavity of the worm gear 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 the worm gear teeth of the material blocking worm gear 17 located at the rear side extends into the feeding cavity 121, and part of the worm gear teeth of the material blocking worm gear located at the front side is located at the front side of the feeding channel 12.

In addition, for the wheel axle 18, a wheel axle sealing structure 20 is arranged between the wheel axle 18 and the supporting shaft sleeve 19, and a balance breather 21 is also arranged on the supporting shaft sleeve 19.

In this embodiment, as shown in fig. 3 and 4, the front part of the conveying cylinder 6 is provided with a powder gathering cone 8, the powder gathering cone 8 is located in front of the meshing position of the worm gear teeth of the material blocking worm gear 17 and the main screw 5, a discharge port at the front end of the powder gathering cone 8 forms a discharge port of the conveying cylinder 6, the radial dimension of the powder gathering cone 8 is gradually reduced from back to front, a boiling head 10 is arranged in the powder gathering cone 8, the boiling head 10 is located between the front end of the main screw 5 and a filling pipe 9, and the filling pipe 9 is welded and fixed at the position of the cone tip of the powder gathering 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, an inner drive shaft 3 is rotatably mounted in the cavity through a corresponding bearing structure, the front end of the inner drive shaft 3 is arranged to protrude forward beyond the front end of the main screw 5, the boiling head 10 is correspondingly fixedly mounted at the front end of the inner drive shaft 3, so that the front end of the inner drive shaft 3 is in transmission connection with the boiling head 10, and the boiling head 10 is coaxially and rotatably mounted at the front end of the main screw 5 through the inner drive shaft 3, and the boiling head 10 is provided with stirring blades 102 for stirring and dispersing powder accumulated in the cone of agglomerated powder when the boiling head 10 rotates.

In the embodiment, as shown in fig. 3 and 4, the rear end of the inner driving shaft 3 extends backwards 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 realize the 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. Second motor 1 and first motor 13 are alternately arranged perpendicularly relatively, all install on speed reducer 2 for whole compact structure is reasonable, and both all adopt servo motor, conveniently realize the accurate control of carrying the powder.

It should be noted that, since the conveying cylinder 6 is filled with powder everywhere, the working environment is severe, and in order to reduce wear, a front end sealing structure 15 is provided between the front end of the inner driving shaft 3 and the front end of the main screw.

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, and the inner diameter of the filling pipe 9 is relatively small, so that the rotating speed of the boiling head 10 is greater than that of the main screw 5, the boiling head 10 is matched with a high rotating speed, the flow consistency of powder conveying is realized, and the condition of motor stalling or current increase caused by 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 that of the main screw 5.

In this embodiment, the structure of the boiling head 10 is 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, the base 101 is provided with a stirring blade 102, the stirring blade 102 gradually extends from back to front along the circumferential direction of the boiling head for applying a forward pushing force to the powder when rotating, the outer diameter of the stirring blade 102 is gradually reduced from back to front corresponding to the powder collecting cone 8, and the stirring blade 102 is specifically a constant pitch conical spiral structure.

The boiling head 10 also extends from back to front with a helix angle less than the angle of repose of the powder. In addition, the front end of the stirring blade 102 is inserted into the filling pipe 9, so that the powder material is prevented from forming a bulge at the inlet of the filling pipe 9 during rotation.

Besides, a gap is reserved on the central position of the boiling head 10 corresponding to the side of the stirring blade 102, so that the boiling head 10 forms a hollow boiling head, the radial size of the hollow part is smaller than the inner diameter of the filling pipe 9, the hollow part also enables the resistance of the central flow part to be small, and the blades of the spiral structure have certain pushing effect on powder on the inner conical surface, and the cost performance is higher. The whole boiling head 10 can drive the powder to rotate, so that the boiling effect is achieved, the flowing characteristic of the powder is improved, the flowing effect is improved, and the powder can be prevented from being accumulated without introducing compressed air.

In fact, for the powder collecting cone 8 with a conical structure, the filling tube 9 is directly welded at the front end of the powder collecting cone 8, and the bottom of the filling tube 9 and the bottom of the powder collecting cone 8 are in straight butt joint in the front-back direction, and both extend along the horizontal direction. Compared with the mode of connecting the corrugated rubber pipe with the filling pipe, the mode of directly and straightly butting the powder gathering cone 8 with the filling pipe 9 is adopted, so that the powder flowing is facilitated, and the powder filling efficiency can be effectively improved.

During the use, the powder in the hopper gets into the transport barrel 6 through the feeding chamber 121 of feedstock channel 12, is rotated in order to carry the powder forward by main screw 5, utilizes the worm-gear teeth on keeping off material worm wheel 17 and the helicla flute cooperation of main screw 5, blocks that the powder in the helicla flute follows main screw 5 gyration and slides, conveniently establishes higher filling pressure. Meanwhile, the front part of the conveying cylinder body 6 is provided with the boiling head 10, when the main screw 5 rotates forwards to convey powder, the inner driving shaft 3 drives the boiling head 10 to rotate reversely, the powder is stirred by the stirring blades 102 to be in a boiling state, high-speed stable powder flow is formed under filling pressure, compressed air is not required to be introduced, the powder can be compactly filled into a corresponding valve bag at high speed, dust generated when the powder is filled into the valve bag is reduced, and the purposes of efficient filling and environment protection are achieved.

The specific embodiment 2 of the powder filling machine provided by the invention is as follows:

the difference from the implementation 1 is mainly as follows: in example 1, the stirring blade of the boiling head has a constant pitch conical helical structure. In the present embodiment, the structure of the boiling head is as shown in fig. 8, the boiling head 10 also includes a base 101, the base 101 is used for fixedly assembling with the front end of the inner driving shaft, the stirring blade 102 is installed 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 size of the helical blade gradually decreases from back to front so as to correspond to the inner surface of the conical pulverized coal gathering cone.

Two helical blades are symmetrically arranged on 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 lateral side of the helical blades, 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 gathering cone, the helical blade extending along the logarithmic spiral line can drive the powder to move towards the cone tip direction of the powder gathering cone at a constant pressure angle, and for the powder with a pressure sensitive effect, the helical blade is a good choice, and the powder is not easy to extrude and agglomerate in the process of gradually moving forwards. Moreover, the boiling head forms a hollow boiling head, and the hollow structure can enable the powder at the center of the spiral to advance at a speed exceeding the conical surface under the action of the feeding thrust. The effect of powder flow ratio similar to that of viscous fluid flow can be achieved.

The specific embodiment 3 of the powder filling machine provided by the invention is as follows:

the difference from example 2 is mainly that: in example 2, the center of the boiling head was hollow to form a hollow boiling head structure. In this embodiment, for the double-blade helical blade, as shown in fig. 9, the central column 103 is disposed at the central axis of the boiling head 10, the central column 103 extends in the front-back direction, the central column 103 is a cone gradually decreasing from back to front, and the two helical blades are disposed around the outer circumferential surface of the central column 103, so that when the 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 central column may be a cylindrical structure, which may also serve to enhance the strength of the boiling point.

The central column is arranged on the boiling head, so that the boiling head has certain bending deformation resistance, high overall strength and convenience in manufacture.

It should be noted that, for the

embodiments

2 and 3, the number of the agitating blades extending along the logarithmic spiral on the boiling head is two. In other embodiments, the base of the boiling head may be provided with only a single helical blade extending along a logarithmic spiral, so as to form a single-blade helical structure, which has the advantages of no need of considering symmetry during manufacture and low cost.

In addition, for the above boiling head with a single helical blade, the base can make the strength of the boiling head better, according to actual needs, a central column can be arranged at 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 helical blade is arranged on the outer peripheral surface of the central column in a surrounding manner.

The central column can be eliminated according to actual needs. At the moment, a gap is reserved on the boiling head at the position of the central axis of the boiling head corresponding to the side of the helical blade, so that the boiling head forms a hollow boiling head, the central resistance of the powder with better fluidity is smaller, and the pressure applied to the powder by the main screw rod is more conveniently converted into the speed of the powder at the gap at the center.

The specific embodiment 4 of the powder filling machine provided by the invention:

the difference from example 1 is mainly that: in example 1, the stirring blade of the boiling head has a constant pitch conical helical 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 scrapers 104 are uniformly distributed on the base 101 along the circumference of the base, the scrapers 104 form corresponding stirring blades, each scraper 104 is a straight scraper extending in the front-back direction, the outer side surface 1041 of each scraper 104 extends obliquely inwards from back to front, so that the outer side surfaces 1041 of all the scrapers 104 are in the same conical surface, and a gap is left at the central axis position of the boiling head 10 corresponding to the side of the scraper 104, so that the boiling head 10 forms a hollow boiling head.

In addition, in order to enlarge the central gap, the inner side surfaces 1042 of the scrapers 104 are gradually and obliquely extended outwards from front to back, so that the three scrapers 104 form a structure with a small front opening and a large rear belly, the small front opening is convenient for the top of the boiling head 10 to enter the filling pipe 9, and the large rear belly is convenient for accommodating more powder to pass through, thereby improving the powder flowability.

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

In this embodiment, gather whitewashed circular cone equipartition three straight scraper blade along circumference on the base. In other embodiments, two straight scrapers may be symmetrically disposed on the base, and certainly, more than four scrapers may be uniformly disposed on the base along the circumferential direction of the base according to actual needs.

The specific embodiment 5 of the powder filling machine provided by the invention:

the difference from example 1 is mainly that: in embodiment 1, the outer side surfaces of the left and right side walls of the worm gear shell are respectively provided with a support shaft sleeve, and the support shaft sleeves are used as bearing seats to rotatably assemble corresponding wheel shafts through a bearing structure so as to realize the rotational assembly of the material blocking worm gear. In this embodiment, the supporting sleeve can be omitted, and at this time, the thickness of the side walls of the left and right sides of the worm gear housing can be thickened to form corresponding bearing seats.

The specific embodiment 6 of the powder filling machine provided by the invention:

the difference from example 1 is mainly that: in embodiment 1, the powder collecting cone at the front part of the conveying cylinder is a conical section, and is conveniently matched with a rotary boiling head. In this embodiment, the powdering cone may also be a pyramid structure, or an arc transition structure with a section edge line being an arc line, without affecting the rotation of the boiling head.

The specific embodiment 7 of the powder filling machine provided by the invention:

the difference from example 1 is mainly that: in example 1, a filler tube was welded to the tip of the powder cone. In this embodiment, the front end of the powder collecting cone can also be fixedly provided with the filling pipe through the flange connection structure, at the moment, the filling pipe can be arranged just opposite to the central axis of the conical powder collecting cone, and at the moment, the bottom of the filling pipe is not directly butted with the bottom of the powder collecting cone in the front-back direction any more.

The specific embodiment 8 of the powder filling machine provided by the invention:

the difference from example 1 is mainly that: in embodiment 1, the whole conveying cylinder extends from back to front and forwards, and a proper inclination angle is selected, so that the bottom of the conical powder collecting cone extends along the horizontal direction, and the bottom of the filling pipe also extends along the horizontal direction, thereby conveniently realizing the straight butt joint of the bottom of the filling pipe and the bottom of the powder collecting cone in the front-back direction. In this embodiment, the bottom of the conical powder gathering cone can be inclined forwards and downwards from back to front, the filling pipe can also be extended forwards from back to front, the inclination angle and the installation position of the filling pipe are designed, and the bottom of the filling pipe and the bottom of the powder gathering cone can be ensured to be in straight butt joint in the front-back direction to ensure the flowability of powder.

The specific embodiment of the powder filling machine provided by the invention 9:

the difference from example 1 is mainly that: in embodiment 1, the boiling head is directly and fixedly mounted at the front end of the inner driving shaft, so that the transmission connection between the inner driving shaft and the boiling head can be realized. In this embodiment, the boiling head can be directly rotatably mounted at the front end of the main screw through a bearing structure, and the front end of the inner driving shaft can be in transmission connection with the base of the boiling head through a spline connection structure.

The specific embodiment 10 of the powder filling machine provided by the invention:

the difference from example 1 is mainly that: in example 1, the direction of rotation of the boiling head is opposite to the direction of rotation of the main screw, and the rotational speed of the boiling head is greater than the rotational speed of the main screw. 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. During specific implementation, the steering and rotating speed of the boiling head can be adjusted in time by using the servo motor according to actual needs.

The specific embodiment of the powder filling machine provided by the invention 11:

the difference from example 1 is mainly that: in embodiment 1, the speed reducer is provided with a first motor and a second motor, the first motor drives the main screw to rotate through the bevel gear transmission structure, and the second motor correspondingly drives the inner driving shaft to rotate through the 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 power of the first motor is a gear shaft, the gear shaft is in meshing transmission with the gear ring, the second motor may drive the inner drive 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 drive shaft, and a driving gear is mounted on the power output shaft of the second motor.

The specific embodiment 12 of the powder filling machine provided by the invention:

the difference from example 1 is mainly that: in embodiment 1, the worm housing is located on the upper side of the main screw. In this embodiment, the worm wheel housing can also be located the horizontal side of main screw, keeps off the material worm wheel and also is located the horizontal side of main screw.

The specific embodiment of the powder filling machine provided by the invention 13:

the difference from example 1 is mainly that: in embodiment 1, the inner cavity of the worm wheel housing is communicated with the feeding channel, and at this time, part of the worm wheel teeth at the rear side of the material blocking worm wheel extend into the feeding channel. In this embodiment, the worm wheel shell also can be separately and independently arranged with feed channel, and the worm wheel shell is independently arranged in the feed channel front side completely, keeps off the material worm wheel and does not extend into feed channel again.

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.

Finally, although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments without departing from the inventive concept, or some of the technical features may be replaced with equivalents. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A powder filling machine comprising:

the device comprises a rack (7), wherein a conveying cylinder body (6) is arranged on the rack (7);

the conveying cylinder (6) inclines forwards and downwards from back to front, a feeding hole is formed in the upper end of the conveying cylinder (6), a feeding channel (12) is arranged on the upper portion of the feeding hole, the feeding channel (12) is provided with a feeding cavity (121) feeding materials into the conveying cylinder (6), and a discharging hole is formed in the front end of the conveying cylinder (6) and used for filling powder into a corresponding packaging bag;

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

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

in the front-back direction, the meshing position of the worm gear teeth of the material blocking worm gear (17) and the 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 to rotate along with the main screw (5) to establish filling pressure.

2. The powder filling machine according to claim 1, wherein the worm gear casing (16) and the stop worm gear (17) are located on the upper side of the main screw (5).

3. The powder filling machine according to claim 2, wherein the inner cavity of the worm gear casing (16) is communicated with the feeding cavity (121) of the feeding channel (12), part of the worm gear teeth on the rear side of the stop worm gear (17) extend into the feeding cavity (121), and part of the worm gear teeth on the front side of the stop worm gear (17) are on the front side of the feeding channel (12).

4. The powder filling machine according to claim 3, wherein the thickness of the worm-gear casing (16) is smaller than the thickness of the feed channel (12) in the circumferential direction of the transport cylinder.

5. The powder filling machine according to claim 3, wherein the rear side of the worm gear 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 gear (17) is defined as the left-right direction, the worm gear housing (16) is provided with two side walls positioned on the left side and the right side of the material blocking worm gear (17), the two side walls are in clearance fit with the corresponding end surfaces of the material blocking worm gear (17) in the left-right direction, the outer sides of the two side walls, which are back to the material blocking worm gear (17), are respectively provided with a supporting shaft sleeve (19), the material blocking worm gear (17) is coaxially and fixedly provided with a wheel shaft (18), the wheel shaft (18) is provided with two side shaft sections penetrating the supporting shaft sleeves (19) on the two sides, and the two side shaft sections are correspondingly and rotatably assembled in the supporting shaft sleeves (19) on the two sides through a bearing structure.

6. The 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 gathering cone (8), the powder gathering cone (8) is positioned at the front side of the meshing position of the gear teeth of the stop worm gear (17) and the main screw (5), a front end discharge port of the powder gathering cone (8) forms a discharge port of the conveying cylinder (6), the radial dimension of the powder gathering cone (8) is gradually reduced from back to front, a boiling head (10) is arranged in the powder gathering 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 gathering cone (8) when the boiling head (10) rotates;

the main screw rod (5) is provided with a cavity extending in the front-back direction, an inner driving shaft (3) is assembled in the cavity in a rotating mode, the rear end of the inner driving shaft (3) is connected with a stirring driving device in a transmission mode, the front end of the inner driving shaft (3) is connected with a boiling head (10) in a transmission mode, 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 rod (5).

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

8. The powder filling machine according to claim 7, wherein the agitating blades (102) are helical blades extending axially in the front-rear direction or straight blades extending in the front-rear direction, and at least two of the straight blades are circumferentially spaced along the boiling head (10).

9. The powder filling machine according to claim 7, wherein a filling tube (9) is welded to the front end of the cone (8), the filling tube (9) extends forward for insertion into a corresponding packaging bag, and the bottom of the filling tube (9) and the bottom of the cone (8) are butt-jointed straight in the front-to-back direction.

10. The powder filling machine according to claim 7, wherein the front end of the stirring blade (102) of the boiling head (10) extends forward into the filling pipe (9).