Novel screw feeding type powder packaging machine

Abstract

The invention discloses a novel screw feeding type powder packaging machine, which belongs to the technical field of material conveying equipment, and is characterized in that a gradual change type pressure relief channel is additionally arranged on one side, close to a discharge port, of a traditional straight-through type material conveying pipeline, so that pressure relief of powder in a stepped gradual change manner during discharging is realized, and the expansion speed of one side, close to the discharge port, of the powder is greatly reduced; in addition, a combined structure of a conical closing-in ring and a spiral flow guiding piece is additionally arranged on one side of the material returning section, when a small amount of powder moves to the end of the material conveying pipeline, the powder is accelerated through a conical closing-in groove, on one hand, a dynamic sealing layer is formed, and on the other hand, the powder is prevented from moving to the end of the material conveying pipeline. On the other hand, kinetic energy of the powder is improved, diffusion of the powder to the periphery is reduced, the problem of fine powder escape is solved, the powder is sprayed into the spiral flow guide piece from the conical closing-in ring and deflected and downwards conveyed in a directional mode along a spiral path in the spiral flow guide piece, the collecting effect is achieved, and the sealing performance of the end of the pipeline is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of material conveying equipment, and more specifically, to a new type of screw feeding powder packaging machine. Background Art

[0002] The tubular screw conveyor is a device suitable for powder conveying, including a conveying pipe, a power device, and a screw auger arranged inside the pipe. By using the rotation of the screw auger, reliable powder conveying is achieved. For example, a control feeding device of an open-bag packaging machine disclosed in the utility model patent with the patent number CN216861872 uses a screw auger to horizontally convey materials;

[0003] However, during the conveying process, under the action of the rotation and pushing of the screw auger, the powder is squeezed forward toward the material outlet side of the conveying pipe, and the powder density increases to form a material plug. When reaching the outlet, the sudden pressure drop may cause the powder to gasify and expand (similar to fluidization), and some fine powder will escape along with the air flow to the end of the conveying pipe, affecting the sealing performance of the end of the conveying pipe.

[0004] Therefore, in view of the above problems, a new type of screw feeding powder packaging machine is proposed. Summary of the Invention

[0005] The purpose of the present invention is to solve the existing problems and provide a new type of screw feeding powder packaging machine compared with the prior art.

[0006] The purpose of the present invention can be achieved by the following technical solutions: A new type of screw feeding powder packaging machine includes a packaging box and a feeding pipeline installed at its upper end. The feeding pipeline includes a straight pipe section, a flared section, a discharging section, a reduced-diameter section, and a return section arranged horizontally in sequence. One side of the upper end of the straight pipe section is provided with a feeding hopper, and the lower end of the discharging section is provided with a discharging port;

[0007] A screw shaft is rotatably installed between the straight pipe section and the return section. A rotary motor for rotating the screw shaft is fixed outside the end of the straight pipe section. A left-right distributed reverse spiral blade and a forward spiral blade are fixedly sleeved on the screw shaft. The forward spiral blade extends from one side of the end of the straight pipe section to the connection between the flared section and the discharging section. The reverse spiral blade is located inside the reduced-diameter section, and the spiral directions of the forward spiral blade and the reverse spiral blade are set in the opposite direction;

[0008] A conical closing ring and a spiral guide member are fixedly installed inside the return section. The conical closing ring is arranged adjacent to the reverse spiral blade side, and a conical closing groove with a gradually decreasing diameter toward the spiral guide member side is opened inside the conical closing ring. The small-diameter end of the conical closing groove is connected to the central feeding port of the spiral guide member. The material dropping port at the bottom of the spiral guide member penetrates through the return section and is connected to the discharging port through a return channel;

[0009] Furthermore, both the flaring section and the necking section are conical structures and are symmetrically distributed on the left and right sides of the discharging section. The inner diameter of the flaring section gradually increases from the straight pipe section to the discharging section, and the inner diameters of the material return section and the straight pipe section are the same.

[0010] Furthermore, the flaring section and the discharging section form a gradually changing pressure relief channel. The section of the forward spiral blade located inside the gradually changing pressure relief channel is a variable-diameter spiral blade. A gradually changing pressure relief channel is added on the side of the traditional straight-through material conveying pipe close to the discharge port, so that the pressure gradient during powder discharging changes from sudden change to gradual change, reducing the conveying blockage on the side of the powder near the discharge port, greatly reducing the powder expansion speed, so as to promote the smooth discharge of the powder from the discharge port. Cooperating with the reversely arranged reverse spiral blade, it reduces the migration of the powder to the end of the material return section.

[0011] Furthermore, the spiral guide member includes a spiral volute installed on the side of the conical closing ring away from the necking section. The side of the spiral volute facing the conical closing ring is provided with a feed port communicating with its interior. The feed port is communicated with the small diameter of the conical closing groove, and the inner diameter of the feed port gradually decreases inward.

[0012] Furthermore, a connecting shaft fixedly connected to the screw shaft is rotatably installed through the inside of the spiral volute. A plurality of flow dividing blades located inside the spiral volute are annularly distributed on the outer end wall of the connecting shaft.

[0013] Furthermore, the plurality of flow dividing blades are inclined inward along the clockwise rotation direction of the screw shaft. The conical closing ring is not the main discharge channel, but a sealing structure for handling high-pressure leakage powder. Part of the powder rushes towards the end along the screw axis, enters the large-diameter end of the conical closing ring, forms a dynamic sealing layer after being accelerated through the conical closing groove, and is sprayed out from the small-diameter end into the spiral guide member. Thereafter, under the rotation of the plurality of flow dividing blades, it is thrown towards the spiral inner wall of the spiral guide member and is conveyed downward along the spiral path. The powder particle trajectory deflects downward to achieve directional guiding.

[0014] Furthermore, a left sealing plate and a right sealing plate are respectively installed at the side end parts of the material return section and the straight pipe section. The left sealing plate is located outside the spiral guide member, the right sealing plate is located outside the end of the forward spiral blade, and a collection port is provided at the bottom end part of the straight pipe section outside the right sealing plate.

[0015] Furthermore, a conveyor belt with both ends extending outward and used for conveying packaging bags is installed inside the packaging box in a conveying manner. A loading port communicating with the discharge port is opened at the upper end of the packaging box, and sealing machines are provided on both the front and rear sides of the end of the packaging box away from the loading port.

[0016] Compared with the prior art, the advantages of the present invention are as follows:

[0017] 1. This solution adds a gradual pressure relief channel to the side of the traditional straight-through conveying pipeline near the discharge port, achieving step-by-step pressure relief for the powder during discharge, greatly reducing the expansion rate of the powder near the discharge port. In conjunction with the reverse spiral blades set on the side of the discharge port, the powder is discharged smoothly from the discharge port, reducing the migration of powder to the end of the return section.

[0018] In addition, a combined design of a conical closing ring and a spiral guide piece is added to one side of the return section. When a small amount of powder rushes toward the end along the axial direction of the screw, it is accelerated by the conical closing groove, forming a dynamic sealing layer on the one hand, and increasing the kinetic energy of the powder on the other hand, reducing its diffusion to the surrounding area, solving the problem of fine powder escape. The powder is ejected from the small-diameter end of the conical closing ring into the spiral guide piece, deflected and transported downward along the spiral path inside the spiral guide piece, improving the sealing performance of the sealing material at the end of the pipeline.

[0019] 2. This solution adds multiple diverter blades inside the spiral guide that rotate synchronously with the screw shaft. The purpose is that after the powder enters the spiral guide through the feed port, it is thrown toward the spiral inner wall of the spiral guide under the action of the rotation of multiple diverter blades. The core function is to guide the high-speed powder airflow ejected from the acceleration section of the tapered closing ring, forcing it to turn and flow downward, and finally guide it to the discharge port through the reflux channel to improve the collection effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 It is an overall cross-sectional view of the present invention;

[0022] Figure 3 It is a cross-sectional view of the junction of the gradual pressure relief channel, the necking section, and the material return section of the present invention;

[0023] Figure 4 Schematic diagram of the external structure of the spiral flow guide of the present invention;

[0024] Figure 5 is an internal cross-sectional view of the spiral flow guide of the present invention;

[0025] Figure 6 Schematic diagram of the internal structure of the present invention;

[0026] Figure 7 It is the workflow diagram of the present invention.

[0027] Description of the numbers in the figure:

[0028] 1. Packaging box; 101. Loading port; 2. Feeding pipeline; 21. Straight pipe section; 211. Feeding hopper; 22. Flared section; 23. Discharging section; 231. Discharge opening; 24. Reduced diameter section; 25. Return material section; 3. Screw shaft; 4. Forward spiral blade; 5. Rotating motor; 6. Reverse spiral blade; 7. Conical closing ring;

[0029] 8. Spiral guide; 81. Spiral volute; 82. Connecting shaft; 83. Diverging blade; 9. Return channel; 10. Conveyor belt; 11. Sealing machine; 12. Right sealing disc; 13. Collection port; 14. Left sealing disc. Specific embodiments

[0030] The following will combine the accompanying drawings in the embodiments of the present invention; clearly and completely describe the technical solutions in the embodiments of the present invention; obviously; the described embodiments are only a part of the embodiments of the present invention; rather than all embodiments. Based on the embodiments of the present invention; all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present invention.

[0031] Embodiment 1: Aiming at the problem that in the traditional straight-through spiral conveying pipeline, the powder is pushed forward by the rotation of the spiral auger and is squeezed towards the side of the feeding port, the powder density increases to form a plug, and when reaching the discharge port, the pressure drops suddenly, which may cause the powder to gasify and expand and rush towards the end of the conveying pipe, affecting the sealing performance of the end of the conveying pipe. The following technical solutions are proposed:

[0032] The present invention discloses a new type of screw-feeding powder packaging machine. Please refer to Figures 1-3 ; it includes a packaging box 1 and a feeding pipeline 2 installed on its upper end. The feeding pipeline 2 includes a straight pipe section 21, a flared section 22, a discharging section 23, a reduced diameter section 24, and a return material section 25 arranged horizontally in sequence. A feeding hopper 211 is provided on one side of the upper end of the straight pipe section 21;

[0033] The straight pipe section 21 is the high-pressure area for powder transportation. A discharge opening 231 is provided at the lower end of the discharging section 23. Both the flared section 22 and the reduced diameter section 24 are conical structures and are symmetrically distributed on the left and right sides of the discharging section 23. The inner diameter of the flared section 22 gradually increases from the straight pipe section 21 to the discharging section 23. The inner diameter of the return material section 25 is the same as that of the straight pipe section 21. The flared section 22 and the discharging section 23 form a gradually changing pressure relief channel, which is the low-pressure area for powder transportation.

[0034] A screw shaft 3 is rotatably installed between the straight pipe section 21 and the return material section 25. A rotating motor 5 for rotating and driving the screw shaft 3 is fixed on the outer side of the end of the straight pipe section 21. The screw shaft 3 is fixedly sleeved with a reverse spiral blade 6 and a forward spiral blade 4 distributed left and right;

[0035] Both ends of the screw shaft 3 are rotatably installed at both ends of the feeding pipeline 2 through rotating shafts. Bearings adapted to the rotating shafts are arranged at both ends of the feeding pipeline 2 to improve the stability of the screw shaft 3 driving the reverse spiral blade 6 and the forward spiral blade 4 to rotate. The forward spiral blade 4 extends from one side of the end of the straight pipe section 21 to the connection between the flared section 22 and the discharging section 23. A section of the forward spiral blade 4 located inside the gradually changing pressure relief channel is a variable-diameter spiral blade;

[0036] Please refer to Figures 2-3 and Figures 6-7 , the separated material to be packaged enters the straight pipe section 21 from the feeding hopper 211. The straight pipe section 21 is used as a high-pressure area for powder transportation. During the gradual spiral advancement process, the powder pressure continuously increases. By adding a gradually changing pressure relief channel on one side of the traditional straight-through feeding pipeline near the discharging port, relying on the flared section with a conical structure and its adapted variable-diameter spiral blade, the pressure gradient during powder discharging is changed from a sudden change to a gradual change, and the pressure is gradually relieved, reducing the transportation blockage on one side of the powder near the discharging port 231, greatly reducing the powder expansion speed, so as to promote the smooth discharge of the powder from the discharging port 231;

[0037] The reverse spiral blade 6 is located inside the necking section 24, and the spiral directions of the forward spiral blade 4 and the reverse spiral blade 6 are set in the opposite direction. And it cooperates with the necking section 24 arranged in the opposite direction to the flared section 22. The reverse spiral blade 6 is adapted to the inner wall of the necking section 24 and is also a variable-diameter spiral blade. Cooperating with the reverse spiral blade 6 arranged in the opposite direction, it promotes the reverse advancement of the powder towards the discharging port 231, reducing the migration of the powder towards the end of the return section 25. Although the reverse spiral section can relieve the problem, there are defects such as high energy consumption and large wear. Therefore, the length of the reverse spiral blade 6 can be shortened according to actual needs.

[0038] Please refer to Figures 2-4 , in order to improve the end sealing performance of the feeding pipeline 2 on one side near the discharging port 231, a conical closing ring 7 and a spiral guide member 8 are fixedly installed inside the return section 25. The conical closing ring 7 is arranged near the reverse spiral blade 6, and a conical closing groove with a gradually decreasing diameter towards the spiral guide member 8 is opened inside the conical closing ring 7. The small-diameter end of the conical closing groove is communicated with the central feeding port of the spiral guide member 8. The bottom discharging port of the spiral guide member 8 penetrates through the return section 25 and is communicated with the discharging port 231 through a return channel 9;

[0039] A small amount of powder will still flow along the axial direction of the screw and reverse the spiral surface of the spiral blade 6 to the end due to the air flow. Therefore, a conical closing ring 7 and a spiral guide member 8 are added in the return section 25. The powder is accelerated by the Venturi through the conical closing groove of the conical closing ring 7. On the one hand, a dynamic sealing layer is formed, and on the other hand, the kinetic energy of the powder is increased, reducing its diffusion to the periphery and solving the problem of fine powder escape. The powder is ejected from the small-diameter end of the conical closing ring 7 into the spiral guide member 8, and the spiral guide member 8 and the return channel 9 cooperate to guide the powder to the discharge port 231, realizing both the return collection of the powder and improving the sealing performance of the pipe end.

[0040] Please refer to Figure 1 , a conveyor belt 10 for conveying the packaging bags is installed inside the packaging box 1 and extends outward at both ends. A loading port 101 communicating with the upper and lower parts of the discharge port 231 is opened at the upper end of the packaging box 1. Sealing machines 11 are provided on both the front and rear sides of the end of the packaging box 1 away from the loading port 101;

[0041] A quantitative discharge valve is installed inside the discharge port 231. The powder discharged downward quantitatively from the discharge port 231 falls into the packaging bag on the conveyor belt 10 through the loading port 101. Through continuous conveying, the pair of sealing machines 11 arranged front and rear are used to seal the loaded packaging bag, and the sealing machine 11 can adopt a hot ironing packaging structure.

[0042] Embodiment 2. On the basis of Embodiment 1, the specific structure of the spiral guide member 8 is further described as follows:

[0043] Please refer to Figures 3-6 , the spiral guide member 8 includes an end installed on the side of the conical closing ring 7 away from the reduced diameter section 24. The spiral guide member 8 includes a spiral volute 81. An inlet connected to its interior is opened on the side of the spiral volute 81 facing the conical closing ring 7. The inlet is connected to the small-diameter of the conical closing groove, and the inner diameter of the inlet gradually decreases inward. A connecting shaft 82 fixedly connected to the screw shaft 3 is rotatably installed through the interior of the spiral volute 81. A plurality of diversion blades 83 are annularly distributed on the outer end wall of the connecting shaft 82 and are located inside the spiral volute 81;

[0044] The plurality of diversion blades 83 are inclined inward in the clockwise rotation direction of the screw shaft 3. The conical closing ring 7 is not the main discharge channel, but a sealing structure for handling high-pressure leakage powder. Part of the powder flows along the axial direction of the screw to the end, enters the large-diameter end of the conical closing ring 7, is accelerated through the conical closing groove to form a dynamic sealing layer, and is ejected from the small-diameter end into the spiral guide member 8. Thereafter, under the rotation of the plurality of diversion blades 83, it is thrown towards the spiral inner wall of the spiral guide member 8 and is conveyed downward along the spiral path. The powder particle trajectory deflects downward, realizing directional diversion.

[0045] In addition, it should be noted that the left sealing disc 14 and the right sealing disc 12 are respectively installed on the side ends of the return section 25 and the straight pipe section 21. Specifically, the left sealing disc 14 and the right sealing disc 12 are respectively installed on the rotating shafts at the two side ends. The connecting shaft 82 is fixedly installed between the screw shaft 2 and one of the rotating shafts. The specific position is designed according to actual needs.

[0046] The left sealing plate 14 is located outside the spiral guide member 8, the right sealing plate 12 is located outside the end of the forward spiral blade 4, and the straight pipe section 21 is located on the bottom end outside the right sealing plate 12 and is provided with a collecting port 13. The right sealing plate 12 and the left sealing plate 14 are added to improve the sealing performance of the left and right ends of the conveying pipeline 2, and the collecting port 13 added to the lower side of the right sealing plate 12 is used to collect a small amount of powder leaked to the starting end of the conveying.

[0047] In summary, a gradual pressure relief channel is added to the side of the conventional straight-through conveying pipe near the discharge port, so that the powder material can be relieved in a step-by-step manner during discharge, which greatly reduces the expansion speed of the powder material near the discharge port 231. In addition, the reverse spiral blades 6 are arranged in opposite directions to facilitate the smooth discharge of the powder material from the discharge port 231, thereby reducing the migration of the powder material to the return section 25 (the end of the conveying pipe 3).

[0048] In addition, a combined design of a conical closing ring 7 and a spiral guide 8 is added to the return section 25. A small amount of powder rushes toward the end along the screw axis and is accelerated by the conical closing groove. On the one hand, this forms a dynamic sealing layer, and on the other hand, it increases the kinetic energy of the powder, reduces its diffusion to the surrounding area, and solves the problem of fine powder escape. The powder is ejected from the small-diameter end of the conical closing ring 7 into the spiral guide 8. Multiple diverter blades 83 are added inside the spiral guide 8, which rotate synchronously with the screw shaft 3.

[0049] After the powder enters the spiral guide 8 through the feed port, it is thrown toward the spiral inner wall of the spiral guide 8 under the rotation of multiple diverter blades 83. The core function of the spiral guide 8 is to guide the powder airflow ejected at high speed from the acceleration section of the conical closing ring 7, forcing it to turn and flow downward, and finally guide it to the discharge port 231 through the reflux channel 9, which improves the collection effect on the one hand and the sealing of the pipeline end on the other.

[0050] The above description is only a preferred specific embodiment of the present invention; however, the protection scope of the present invention is not limited thereto; any technician familiar with the technical field within the technical scope disclosed by the present invention; any equivalent replacement or change based on the technical solution and improved conception of the present invention shall be covered within the protection scope of the present invention.

Claims

1. A new type of screw-feed powder packaging machine, comprising a packaging box (1) and a feeding pipeline (2) installed at its upper end, characterized in that: The feeding pipeline (2) includes a straight pipe section (21), a flared section (22), a discharging section (23), a reduced-diameter section (24), and a material-return section (25) arranged in sequence horizontally. An inlet hopper (211) is provided at the end of the straight pipe section (21), and a discharging port (231) is provided at the lower end of the discharging section (23). A screw shaft (3) is rotatably driven and installed between the straight pipe section (21) and the material-return section (25). Reverse spiral blades (6) and forward spiral blades (4) are fixedly sleeved on the screw shaft (3) and distributed left and right. The forward spiral blade (4) extends from one side of the end of the straight pipe section (21) to the connection part between the flared section (22) and the discharging section (23), and the reverse spiral blade (6) is located inside the reduced-diameter section (24). A conical closing ring (7) and a spiral guide member (8) are fixedly installed inside the material-return section (25). The conical closing ring (7) is arranged adjacent to the reverse spiral blade (6), and a conical closing groove with a gradually decreasing diameter towards the spiral guide member (8) is formed inside the conical closing ring (7). The small-diameter end of the conical closing groove is communicated with the central inlet of the spiral guide member (8), and the material dropping port at the bottom of the spiral guide member (8) penetrates through the material-return section (25) and is communicated with the discharging port (231) through a return channel (9).

2. A novel screw-feeding powder packaging machine according to claim 1, characterized in that: Both the flared section (22) and the reduced-diameter section (24) are conical structures and are symmetrically distributed on the left and right sides of the discharging section (23). The inner diameter of the flared section (22) gradually increases from the straight pipe section (21) to the discharging section (23), and the inner diameters of the material-return section (25) and the straight pipe section (21) are the same.

3. A novel screw-feeding powder packaging machine according to claim 2, characterized in that: The flared section (22) and the discharging section (23) form a gradually changing pressure relief channel, and a section of the forward spiral blade (4) located inside the gradually changing pressure relief channel is a variable-diameter spiral blade.

4. A novel screw-feeding powder packaging machine according to claim 1, characterized in that: The spiral guide member (8) includes a spiral volute (81) installed on the side of the conical closing ring (7) away from the reduced-diameter section (24). An inlet communicating with its interior is formed on the side of the spiral volute (81) facing the conical closing ring (7). The inlet is communicated with the small-diameter of the conical closing groove, and the inner diameter of the inlet gradually decreases inward.

5. A novel screw-feeding powder packaging machine according to claim 4, characterized in that: A connecting shaft (82) fixedly connected to the screw shaft (3) is rotatably installed through the interior of the spiral volute (81). A plurality of flow dividing blades (83) are annularly distributed on the outer end wall of the connecting shaft (82) and are located inside the spiral volute (81).

6. A novel screw-feeding powder packaging machine according to claim 5, characterized in that: A plurality of the flow dividing blades (83) are inclined inward along the clockwise rotation direction of the screw shaft (3).

7. A novel screw-feeding powder packaging machine according to claim 1, characterized in that: Left and right sealing plates (14) and (12) are respectively installed at the side ends of the material-return section (25) and the straight pipe section (21). The left sealing plate (14) is located outside the spiral guide member (8), the right sealing plate (12) is located outside the end of the forward spiral blade (4), and a collection port (13) is provided at the bottom end of the straight pipe section (21) outside the right sealing plate (12).

8. A novel screw-feeding powder packaging machine according to claim 1, wherein: Inside the packaging box (1), a conveyor belt (10) is installed for conveying, which extends outward at both ends and is used for conveying packaging bags. A loading opening (101) is provided at the upper end of the packaging box (1), which is vertically communicated with the discharging opening (231). Sealing machines (11) are provided on both the front and rear sides of the end of the packaging box (1) on the side away from the loading opening (101).

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