Tubular spiral conveyer

Abstract

The invention discloses a tubular spiral conveyor, and relates to the technical field of tubular spiral conveyors. The tubular spiral conveyor comprises a conveying pipe, a conveying shaft is rotationally installed in the conveying pipe, a conveying spiral assembly is slidably connected to the outer side of the conveying shaft and composed of a first spiral piece and a second spiral piece, and two telescopic sealing pieces are arranged between the first spiral piece and the second spiral piece. Top springs are arranged between the first spiral piece and the inner wall of the conveying pipe and between the second spiral piece and the inner wall of the conveying pipe, multiple sets of inner ring grooves are formed in the inner wall of the conveying pipe, and the distance between every two adjacent inner ring grooves is the same as the screw pitch of the first spiral piece and the screw pitch of the second spiral piece. Through cooperative use of the double spiral pieces and the inner rotating ring, the conveying efficiency can be improved, blockage can be reduced, uniform flowing and stirring of materials can be promoted, a pipeline is kept clean, and the semi-solid material conveying device is suitable for efficient conveying of semi-solid materials.

Description

Technical Field

[0001] The present invention relates to the technical field of tubular screw conveyors, in particular to a tubular screw conveyor. Background Art

[0002] Tubular screw conveyors are a common type of material conveying equipment, widely used in various industrial fields, especially in the coal, ore, fertilizer, food, and pharmaceutical industries. Their main function is to transport granular, powdered, and bulk materials along a closed pipe through the rotation of the spiral blades.

[0003] Tubular screw conveyors convey materials through a closed pipe through the coordination of a screw shaft and spiral blades. The spiral blades propel the material forward along the pipe as the screw shaft rotates. The enclosed design of the pipe allows for efficient material transport within a compact space, while minimizing leakage and contamination. Therefore, tubular screw conveyors are commonly used for conveying semi-solid materials (such as food ingredients like dough, wet powder, and fruit puree). A Chinese patent application (publication number: CN112027537A) discloses a tubular screw conveyor comprising a conveying tube, wherein a spiral blade shaft is disposed within the conveying tube, one end of the spiral blade shaft extending from the exterior of the conveying tube, a bevel gear turntable disposed on the protruding end of the spiral blade shaft, a fixed frame disposed at the end of the conveying tube proximate the bevel gear turntable, a first motor mounted on the fixed frame, a bevel gear disposed on the output shaft of the first motor, the teeth of the bevel gear meshing with the teeth of the bevel gear turntable, a screening mechanism disposed at the upper end of the conveying tube proximate the first motor, and a discharge hopper disposed at the lower end of the conveying tube distal from the first motor. When conveying semi-solid materials (e.g., food ingredients such as dough, wet powder, and fruit puree) using tubular screw conveyors described in this patent and prior art, the semi-solid materials typically have high viscosity and are prone to accumulating or adhering to the inner wall of the conveying tube, causing blockage during conveyance. Summary of the Invention

[0004] The purpose of the present invention is to solve the above problems and provide a tubular screw conveyor.

[0005] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions: A tubular screw conveyor comprises a conveying pipe, a conveying shaft rotatably mounted inside the conveying pipe, a conveying screw assembly slidably connected to the outside of the conveying shaft, the conveying screw assembly comprising a first spiral plate and a second spiral plate, two sets of telescopic seals being provided between the first spiral plate and the second spiral plate, and top springs being provided between the first spiral plate and the second spiral plate and the inner wall of the conveying pipe; The inner wall of the conveying pipe is provided with multiple groups of inner ring grooves, and the spacing between adjacent inner ring grooves is the same as the pitch of the first spiral sheet and the second spiral sheet. An inner rotating ring is installed in the inner ring groove for sealing rotation. The inner diameter of the inner rotating ring is the same as the inner diameter of the conveying pipe. A clamping column is provided on the inner wall of the inner rotating ring, and the clamping column is inserted between the first spiral sheet and the second spiral sheet. The outer surface of the inner rotating ring is provided with multiple groups of shifting grooves in an annular shape, and a plurality of inner shifting pieces are provided on the inner wall of the inner ring groove, and the inner shifting pieces are inserted in the shifting grooves.

[0006] Furthermore, an upper hopper is provided at the top of the conveying pipe, and the upper hopper is located on the left side of the leftmost inner ring groove. A lower hopper is provided at the bottom of the conveying pipe, and the lower hopper is located on the right side of the rightmost inner ring groove. A drive motor is fixedly installed at the left end of the conveying pipe, and the drive motor is connected to the conveying shaft through a reducer.

[0007] Furthermore, the outer surface of the conveying shaft is provided with an outer guide bar, the outer surface of the outer guide bar is provided with an arc chamfer, the inner sides of the first spiral sheet and the second spiral sheet are provided with a guide groove, and the outer guide bar is sealed and inserted in the guide groove.

[0008] Furthermore, a support ring is welded to the left end of the first spiral plate and the right end of the second spiral plate, a rotation groove is opened inside the support ring, a connecting swivel is inserted into the interior of the rotation groove, and a mounting ring is fixedly installed on the outside of the rotation groove. The mounting ring clamps the connecting swivel in the rotation groove, and the top spring is fixedly installed between the mounting ring and the inner wall of the conveying pipe.

[0009] Furthermore, the interior of the conveying shaft is designed to be hollow, an inner conduit is inserted into the interior of the conveying shaft, a branch pipe is provided on the outside of the inner conduit, and the branch pipe passes through the inner telescopic seal.

[0010] Furthermore, a rotary sealing joint is fixedly installed on the right end of the conveying shaft, and the inner conduit is connected to the rotary sealing joint.

[0011] Furthermore, a compression distance is provided between the two groups of telescopic seals and the edge of the first spiral sheet.

[0012] Furthermore, the telescopic seal is composed of a spiral bone bar and a spiral expansion piece. The spiral expansion piece is fixedly connected between the first spiral piece and the second spiral piece. The spiral bone bar is arranged in the middle of the spiral expansion piece.

[0013] Furthermore, after the clamping column is inserted between the first spiral piece and the second spiral piece, it presses against the outer surface of the spiral bone strip.

[0014] The beneficial effects of the present invention are as follows: 1. The present invention adopts the design of double helical blades, and a telescopic seal is provided between the double helical blades, so that an adjustable sealed space is formed between the double helical blades. Liquid is injected into the adjustable sealed space, and the distance between the double helical blades increases under the action of hydraulic pressure. Therefore, during the spiral conveying process, the semi-solid material can be squeezed and squeezed toward the inner rotating ring, reducing the adhesion of the material to the cylinder wall and ensuring smoother material flow. At the same time, the double helical blades drive the inner rotating ring to rotate, and the inner rotating ring flips the semi-solid material thereon to ensure the uniformity of the material during the conveying process. The coordinated use of the double helical blades and the inner rotating ring can not only improve the conveying efficiency and reduce blockage, but also promote the uniform flow and stirring of the material, keep the pipeline clean, and is suitable for the efficient conveying of semi-solid materials.

[0015] 2. The present invention provides a shifting groove on the outer surface of the inner rotating ring. When the inner rotating ring rotates, the shifting groove shifts the inner shifting piece, causing the inner rotating ring to generate micro-vibration, which can further improve the turning effect of the inner rotating ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 Schematic diagram of the internal structure of the delivery pipe of the present invention; Figure 3 This is a schematic diagram of the radial cross-sectional structure of the overall structure of the present invention; Figure 4 It is a schematic diagram of the structure of the conveying shaft and conveying screw assembly of the present invention; Figure 5 is an exploded view of the conveying screw assembly of the present invention; Figure 6 It is a schematic structural diagram of the telescopic seal of the present invention; Figure 7 It is a schematic cross-sectional view of the conveying shaft and conveying screw assembly of the present invention; Figure 8 It is a schematic diagram of the inner swivel structure of the present invention.

[0017] Figure numerals: 1. Conveying pipe; 11. Inner ring groove; 12. Upper hopper; 13. Lower hopper; 14. Driving motor; 15. Reducer; 16. Inner paddle; 2. Conveying shaft; 21. Outer guide bar; 3. Conveying spiral assembly; 31. First spiral sheet; 32. Second spiral sheet; 33. Telescopic seal; 331. Spiral bone bar; 332. Spiral telescopic sheet; 34. Support ring; 35. Connecting swivel; 36. Top spring; 37. Mounting ring; 38. Guide groove; 4. Inner swivel; 41. Clamping column; 42. Paddle groove; 5. Inner guide tube; 51. Branch pipe; 52. Rotary sealing joint. DETAILED DESCRIPTION

[0018] To make the objectives, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0019] Example 1, as Figures 1-8 As shown, a tubular screw conveyor includes a conveying pipe 1, a conveying shaft 2 is rotatably mounted inside the conveying pipe 1, and a conveying screw assembly 3 is slidably connected to the outside of the conveying shaft 2. The conveying screw assembly 3 is composed of a first spiral piece 31 and a second spiral piece 32. Two sets of telescopic seals 33 are provided between the first spiral piece 31 and the second spiral piece 32. A top spring 36 is provided between the first spiral piece 31 and the second spiral piece 32 and the inner wall of the conveying pipe 1; The inner wall of the delivery pipe 1 is provided with multiple groups of inner ring grooves 11, and the spacing between adjacent inner ring grooves 11 is the same as the pitch of the first spiral sheet 31 and the second spiral sheet 32. The inner ring groove 11 is internally sealed and rotatably installed with an inner rotating ring 4. The inner diameter of the inner rotating ring 4 is the same as the inner diameter of the delivery pipe 1. The inner wall of the inner rotating ring 4 is provided with a clamping column 41, and the clamping column 41 is inserted between the first spiral sheet 31 and the second spiral sheet 32. The outer surface of the inner rotating ring 4 is provided with multiple groups of shift grooves 42 in an annular manner, and the inner wall of the inner ring groove 11 is provided with a plurality of inner shift pieces 16, which are inserted into the shift grooves 42.

[0020] Furthermore, an upper hopper 12 is provided at the top of the conveying pipe 1, and the upper hopper 12 is located on the left side of the leftmost inner ring groove 11. A lower hopper 13 is provided at the bottom of the conveying pipe 1, and the lower hopper 13 is located on the right side of the rightmost inner ring groove 11. A drive motor 14 is fixedly installed at the left end of the conveying pipe 1, and the drive motor 14 is connected to the conveying shaft 2 through a reducer 15.

[0021] When in use, start the equipment, drive motor 14 drives conveying shaft 2 to rotate, conveying shaft 2 drives first spiral piece 31 and second spiral piece 32 to rotate, semi-solid material is added into conveying pipe 1 through upper hopper 12, first spiral piece 31 and second spiral piece 32 spirally rotate to push material, at the same time, because clamping column 41 is inserted between first spiral piece 31 and second spiral piece 32, first spiral piece 31 and second spiral piece 32 drive inner rotating ring 4 to rotate synchronously through clamping column 41, because two groups of telescopic sealing members 33 are provided between first spiral piece 31 and second spiral piece 32, thus forming adjustable sealing space between first spiral piece 31 and second spiral piece 32, and when conveying, first spiral piece 31 and second spiral piece 32 are provided with two groups of telescopic sealing members 3 ... At the same time, gas or liquid can be introduced into the sealing gap. If the material needs to be kept low during the conveying process, low-temperature water can be injected into it. Under the action of pressure, the first spiral piece 31 and the second spiral piece 32 slide relative to the conveying shaft 2 and move away from each other, which increases the overall width of the conveying spiral assembly 3, thereby reducing the conveying gap, and generating axial extrusion on the semi-solid material, and squeezing it onto the inner rotating ring 4. For semi-solid materials, due to their dual characteristics of solid and fluid states, simple pushing may not be enough to make the material flow smoothly. The axial extrusion can compress the distance between the particles of the material, thereby destroying the viscous connection between the materials and making them looser. , enhance the fluidity of the material. This enhanced fluidity enables the material to be conveyed more smoothly, improves the conveying efficiency, reduces the adhesion of the material to the cylinder wall, and ensures that the material flows more smoothly. In the process of the first spiral piece 31 and the second spiral piece 32 moving away from each other, the first spiral piece 31 and the second spiral piece 32 also move away from the clamping column 41. At this time, the inner rotating ring 4 does not rotate with the first spiral piece 31 and the second spiral piece 32, so that the material can be stably squeezed on the inner rotating ring 4, and then the adjustable sealing space is drained. Under the action of the top spring 36, the first spiral piece 31 and the second spiral piece 32 are brought together. When the first spiral piece 31 or the second spiral piece 32 contacts the clamping column 41 again, The first spiral piece 31 and the second spiral piece 32 drive the inner rotating ring 4 to rotate again through the clamping column 41, and as the first spiral piece 31 and the second spiral piece 32 continue to close together, the clamping column 41 will push the inner rotating ring 4 to rotate relative to the conveying shaft 2, and the inner rotating ring 4 will produce a short and rapid rotation, and the material thereon will be quickly turned over to ensure the uniformity of the material during the conveying process. At the same time, when the inner rotating ring 4 rotates synchronously with the conveying shaft 2, the inner paddle 16 causes the inner rotating ring 4 to produce micro-vibration through the paddle groove 42, which can more effectively realize the turning of the material and prevent the material from excessively sticking to the inner rotating ring 4. Therefore, the tubular screw conveyor of the present invention can realize high-speed transportation of semi-solid materials without causing blockage.

[0022] Since the inner rotating ring 4 rotates with the first spiral piece 31 and the second spiral piece 32, if it is fixed, the contact portion between the clamping column 41 and the first spiral piece 31 and the second spiral piece 32 is likely to be blocked by the material. However, the first spiral piece 31 and the second spiral piece 32 of the present invention can be moved away from each other, that is, they will be displaced relative to the inner rotating ring 4, which can push and scrape the material in the contact portion outward, ensuring that the semi-solid material will not always be stuck in the contact portion, and the conveying effect is good.

[0023] Embodiment 2, based on the above embodiment, further includes that the outer surface of the conveying shaft 2 is provided with an outer guide bar 21, the outer surface of the outer guide bar 21 is provided with a circular arc chamfer, the inner side of the first spiral plate 31 and the second spiral plate 32 is provided with a guide groove 38, and the outer guide bar 21 is sealed and inserted in the guide groove 38.

[0024] By providing the outer guide bar 21 and the guide groove 38, the conveying shaft 2 can drive the first spiral piece 31 and the second spiral piece 32 to rotate. At the same time, the first spiral piece 31 and the second spiral piece 32 can slide stably relative to the conveying shaft 2. Moreover, the design of the arc chamfer prevents material from getting stuck.

[0025] Embodiment 3, based on the above embodiment, further includes: a support ring 34 is welded to the left end of the first spiral plate 31 and the right end of the second spiral plate 32, a spiral groove is opened inside the support ring 34, a connecting swivel 35 is inserted into the interior of the spiral groove, a mounting ring 37 is fixedly installed on the outside of the spiral groove, the mounting ring 37 clamps the connecting swivel 35 in the spiral groove, and a top spring 36 is fixedly installed between the mounting ring 37 and the inner wall of the conveying pipe 1.

[0026] The support ring 34 allows the thrust of the top spring 36 to be more stably transmitted to the first and second helical plates 31 and 32 , and the connecting ring 35 prevents the top spring 36 from affecting the rotation of the first and second helical plates 31 and 32 .

[0027] Embodiment 4, based on the above embodiment, further includes a hollow design inside the conveying shaft 2, an inner tube 5 is inserted into the interior of the conveying shaft 2, a branch tube 51 is provided on the outside of the inner tube 5, and the branch tube 51 passes through the inner telescopic seal 33.

[0028] Furthermore, a rotary sealing joint 52 is fixedly installed on the right end of the conveying shaft 2 , and the inner conduit 5 is connected to the rotary sealing joint 52 .

[0029] By providing the inner conduit 5 and the branch pipe 51 , liquid or gas can be quickly and evenly injected into the adjustable sealing space, so that the first spiral sheet 31 and the second spiral sheet 32 are subjected to uniform and stable forces.

[0030] Embodiment 5, based on the above embodiment, further includes that a compression gap is set between the two sets of telescopic seals 33 and the edge of the first spiral sheet 31. Through this design, the telescopic seals 33 will not contact the inner wall of the conveying pipe 1 when stretched or folded, and will not increase the conveying friction.

[0031] Example 6, based on the above example, further includes: the telescopic seal 33 is composed of a spiral bone strip 331 and a spiral telescopic piece 332, the spiral telescopic piece 332 is fixedly connected between the first spiral piece 31 and the second spiral piece 32, and the spiral bone strip 331 is arranged in the middle of the spiral telescopic piece 332.

[0032] Furthermore, after the clamping column 41 is inserted between the first spiral piece 31 and the second spiral piece 32 , it presses against the outer surface of the spiral bone strip 331 . This design can improve the stability of the spiral bone strip 331 .

[0033] The spiral expansion piece 332 realizes expansion sealing, and the spiral bone strip 331 realizes internal support, thereby preventing the spiral expansion piece 332 from over-expanding and contacting the inner wall of the delivery pipe 1 when liquid or gas is injected.

[0034] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A tubular screw conveyor, comprising a conveying pipe (1), characterized in that: A conveying shaft (2) is rotatably mounted inside the conveying pipe (1), and a conveying spiral assembly (3) is slidably connected to the outside of the conveying shaft (2). The conveying spiral assembly (3) is composed of a first spiral piece (31) and a second spiral piece (32). Two sets of telescopic sealing members (33) are provided between the first spiral piece (31) and the second spiral piece (32). A top spring (36) is provided between the first spiral piece (31) and the second spiral piece (32) and the inner wall of the conveying pipe (1). The inner wall of the delivery pipe (1) is provided with a plurality of inner ring grooves (11), the spacing between adjacent inner ring grooves (11) is the same as the pitch of the first spiral sheet (31) and the second spiral sheet (32), an inner rotating ring (4) is installed in a sealing rotation inside the inner ring groove (11), the inner diameter of the inner rotating ring (4) is the same as the inner diameter of the delivery pipe (1), a clamping column (41) is provided on the inner wall of the inner rotating ring (4), the clamping column (41) is inserted between the first spiral sheet (31) and the second spiral sheet (32), the outer surface of the inner rotating ring (4) is provided with a plurality of shifting grooves (42), the inner wall of the inner ring groove (11) is provided with a plurality of inner shifting pieces (16), and the inner shifting pieces (16) are inserted in the shifting grooves (42).

2. A tubular screw conveyor according to claim 1, characterized in that: An upper hopper (12) is provided at the top of the conveying pipe (1), and the upper hopper (12) is located on the left side of the leftmost inner ring groove (11). A lower hopper (13) is provided at the bottom of the conveying pipe (1), and the lower hopper (13) is located on the right side of the rightmost inner ring groove (11). A driving motor (14) is fixedly installed at the left end of the conveying pipe (1), and the driving motor (14) is connected to the conveying shaft (2) through a reducer (15).

3. The tubular screw conveyor according to claim 1, characterized in that: The outer surface of the conveying shaft (2) is provided with an outer guide bar (21), and the outer surface of the outer guide bar (21) is provided with an arc chamfer. The inner sides of the first spiral piece (31) and the second spiral piece (32) are provided with a guide groove (38), and the outer guide bar (21) is sealed and inserted in the guide groove (38).

4. A tubular screw conveyor according to claim 3, characterized in that: A support ring (34) is welded to the left end of the first spiral plate (31) and the right end of the second spiral plate (32). A rotation groove is provided inside the support ring (34). A connecting swivel (35) is inserted into the interior of the rotation groove. A mounting ring (37) is fixedly installed on the outside of the rotation groove. The mounting ring (37) clamps the connecting swivel (35) in the rotation groove. A top spring (36) is fixedly installed between the mounting ring (37) and the inner wall of the conveying pipe (1).

5. The tubular screw conveyor according to claim 2, characterized in that: The interior of the conveying shaft (2) is designed to be hollow. An inner conduit (5) is inserted into the interior of the conveying shaft (2). A branch pipe (51) is provided on the outside of the inner conduit (5). The branch pipe (51) passes through the inner telescopic seal (33).

6. The tubular screw conveyor according to claim 5, characterized in that: A rotary sealing joint (52) is fixedly mounted on the right end of the conveying shaft (2), and the inner conduit (5) is connected to the rotary sealing joint (52).

7. The tubular screw conveyor according to claim 1, characterized in that: A compression distance is provided between the two groups of telescopic seals (33) and the edge of the first spiral sheet (31).

8. The tubular screw conveyor according to claim 7, characterized in that: The telescopic seal (33) is composed of a spiral bone strip (331) and a spiral telescopic piece (332). The spiral telescopic piece (332) is fixedly connected between the first spiral piece (31) and the second spiral piece (32). The spiral bone strip (331) is arranged in the middle of the spiral telescopic piece (332).

9. The tubular screw conveyor according to claim 8, characterized in that: After the clamping column (41) is inserted between the first spiral piece (31) and the second spiral piece (32), it presses against the outer surface of the spiral bone strip (331).

Images