A tubular screw conveyor

Abstract

This invention discloses a tubular screw conveyor, relating to the technical field of tubular screw conveyors. The tubular screw conveyor includes a conveying pipe, with a conveying shaft rotatably mounted inside the conveying pipe. A conveying screw assembly is slidably connected to the outside of the conveying shaft. The conveying screw assembly consists of a first screw blade and a second screw blade. Two sets of telescopic seals are provided between the first and second screw blades. Top springs are provided between the first and second screw blades and the inner wall of the conveying pipe. Multiple sets of inner annular grooves are formed on the inner wall of the conveying pipe, with the spacing between adjacent inner annular grooves being the same as the pitch of the first and second screw blades. This invention, through the combined use of double screw blades and inner rotating rings, not only improves conveying efficiency and reduces blockages, but also promotes uniform flow and mixing of materials, keeps the pipeline clean, and is suitable for the efficient conveying of semi-solid materials.

Description

Technical Field

[0001] This invention relates to the field of tubular screw conveyor technology, and specifically to a tubular screw conveyor. Background Technology

[0002] Tubular screw conveyors are a common type of material conveying equipment, widely used in various industrial sectors, especially in coal, ore, fertilizer, food, and pharmaceutical industries. Their main function is to transport granular, powdery, and lumpy materials along a closed pipeline through the rotating motion of the screw blades.

[0003] Tubular screw conveyors transport materials within a closed pipe through the cooperation of a screw shaft and screw blades. The screw blades, rotating with the screw shaft, propel the material forward along the pipe. The enclosed design of the pipe allows for efficient material transport within a small space, minimizing leakage and external contamination during transport. Therefore, semi-solid materials (such as food ingredients like dough, wet powder, and fruit puree) are typically transported using tubular screw conveyors. Chinese patent (publication number: CN112027537A) discloses a tubular screw conveyor, including a conveying pipe with a helical blade shaft inside. One end of the helical blade shaft extends outside the conveying pipe, and a bevel gear turntable is provided at the extended end of the helical blade shaft. A fixing frame is provided at the end of the conveying pipe near the bevel gear turntable, and a first motor is mounted on the fixing frame. A bevel gear is mounted on the output shaft of the first motor, and the tooth grooves of the bevel gear mesh with the tooth grooves of the bevel gear turntable. A screening mechanism is provided at the upper end of the conveying pipe near the first motor, and a discharge hopper is provided at the lower end of the conveying pipe away from the first motor. This patent differs from existing tubular screw conveyors in that when conveying semi-solid materials (such as food ingredients like dough, wet powder, and fruit puree), the semi-solid materials typically have high viscosity and easily accumulate or adhere to the inner wall of the conveying cylinder, leading to blockages during the conveying process. Summary of the Invention

[0004] The purpose of this invention is to provide a tubular screw conveyor in order to solve the above-mentioned problems.

[0005] To achieve the above objectives, the present invention specifically adopts the following technical solution:

[0006] A tubular screw conveyor includes a conveying pipe, a conveying shaft is rotatably mounted inside the conveying pipe, and a conveying screw assembly is slidably connected to the outside of the conveying shaft. The conveying screw assembly consists of a first screw blade and a second screw blade, and two sets of telescopic seals are provided between the first screw blade and the second screw blade. Top springs are provided between the first screw blade and the second screw blade and the inner wall of the conveying pipe.

[0007] The inner wall of the conveying pipe has multiple sets of inner ring grooves. The spacing between adjacent inner ring grooves is the same as the pitch of the first and second spiral blades. An inner rotating ring is rotatably installed inside the inner ring groove. The inner diameter of the inner rotating ring is the same as the inner diameter of the conveying pipe. A retaining post is provided on the inner wall of the inner rotating ring. The retaining post is inserted between the first and second spiral blades. Multiple sets of eccentric grooves are formed on the outer surface of the inner rotating ring. Several inner eccentric plates are provided on the inner wall of the inner ring groove. The inner eccentric plates are inserted into the eccentric grooves.

[0008] Furthermore, a feeding hopper is provided at the top of the conveying pipe, which is located on the left side of the leftmost inner annular groove. A discharging hopper is provided at the bottom of the conveying pipe, which is located on the right side of the rightmost inner annular 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.

[0009] 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 a rounded chamfer, and the inner sides of the first spiral blade and the second spiral blade are provided with guide grooves, and the outer guide bar is sealed and inserted into the guide grooves.

[0010] Furthermore, a support ring is welded to the left end of the first spiral blade and the right end of the second spiral blade. A spiral groove is opened inside the support ring, and a connecting rotating ring is inserted into the spiral groove. An installation ring is fixedly installed on the outside of the spiral groove, and the installation ring clamps the connecting rotating ring in the spiral groove. A top spring is fixedly installed between the installation ring and the inner wall of the conveying pipe.

[0011] Furthermore, the conveying shaft has a hollow interior design, with an inner guide tube inserted inside. A branch tube is provided on the outside of the inner guide tube, and the branch tube passes through the telescopic seal on the inside.

[0012] Furthermore, a rotary sealing joint is fixedly installed at the right end of the conveying shaft, and the inner guide tube is connected to the rotary sealing joint.

[0013] Furthermore, a compression gap is provided between the two sets of telescopic seals and the edge of the first spiral plate.

[0014] Furthermore, the telescopic seal is composed of a spiral rib and a spiral telescopic plate, with the spiral telescopic plate fixedly connected between the first spiral plate and the second spiral plate, and the spiral rib disposed in the middle of the spiral telescopic plate.

[0015] Furthermore, after the locking pin is inserted between the first spiral blade and the second spiral blade, it presses against the outer surface of the spiral rib.

[0016] The beneficial effects of this invention are as follows:

[0017] 1. This invention employs a double-helix blade design with a telescopic seal between the blades, creating an adjustable sealing space. Injecting liquid into this space increases the distance between the blades under hydraulic pressure, thus compressing the semi-solid material during the spiral conveying process. This compresses the material towards the inner rotating ring, reducing adhesion between the material and the cylinder wall and ensuring smoother material flow. Simultaneously, the double-helix blades drive the inner rotating ring to agitate the semi-solid material, ensuring uniformity during conveying. The combined use of the double-helix blades and the inner rotating ring not only improves conveying efficiency and reduces blockages but also promotes uniform material flow and mixing, keeping the pipeline clean. This invention is suitable for the efficient conveying of semi-solid materials.

[0018] 2. The present invention provides a groove on the outer surface of the inner rotating ring. During the rotation of the inner rotating ring, the groove moves the inner plate, causing the inner rotating ring to vibrate slightly, which can further improve the material turning effect of the inner rotating ring. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the internal structure of the delivery pipe of the present invention;

[0021] Figure 3 This is a radial cross-sectional view of the overall structure of the present invention;

[0022] Figure 4 This is a schematic diagram of the conveyor shaft and conveyor screw assembly of the present invention;

[0023] Figure 5 This is an exploded view of the conveying spiral assembly of the present invention;

[0024] Figure 6 This is a schematic diagram of the telescopic sealing component structure of the present invention;

[0025] Figure 7 This is a cross-sectional view of the conveyor shaft and conveyor screw assembly of the present invention;

[0026] Figure 8 This is a schematic diagram of the inner rotating ring structure of the present invention.

[0027] Reference numerals: 1. Conveying pipe; 11. Inner annular groove; 12. Feeding hopper; 13. Discharging hopper; 14. Drive motor; 15. Reducer; 16. Inner deflector; 2. Conveying shaft; 21. Outer guide bar; 3. Conveying spiral assembly; 31. First spiral blade; 32. Second spiral blade; 33. Telescopic seal; 331. Spiral reinforcement; 332. Spiral telescopic blade; 34. Support ring; 35. Connecting swivel; 36. Top spring; 37. Mounting ring; 38. Guide groove; 4. Inner swivel; 41. Locking post; 42. Deflector groove; 5. Inner guide tube; 51. Branch pipe; 52. Rotary sealing joint. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0029] 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 screw blade 31 and a second screw blade 32. Two sets of telescopic seals 33 are provided between the first screw blade 31 and the second screw blade 32. Top springs 36 are provided between the first screw blade 31 and the second screw blade 32 and the inner wall of the conveying pipe 1.

[0030] The inner wall of the conveying pipe 1 has multiple sets of inner ring grooves 11. The spacing between adjacent inner ring grooves 11 is the same as the pitch of the first spiral blade 31 and the second spiral blade 32. An inner rotating ring 4 is rotatably installed inside the inner ring groove 11. The inner diameter of the inner rotating ring 4 is the same as the inner diameter of the conveying pipe 1. A retaining post 41 is provided on the inner wall of the inner rotating ring 4. The retaining post 41 is inserted between the first spiral blade 31 and the second spiral blade 32. Multiple sets of eccentric grooves 42 are formed on the outer surface of the inner rotating ring 4. Several inner eccentric plates 16 are provided on the inner wall of the inner ring groove 11. The inner eccentric plates 16 are inserted into the eccentric grooves 42.

[0031] Furthermore, a feeding hopper 12 is provided at the top of the conveying pipe 1, which is located to the left of the leftmost inner ring groove 11. A discharging hopper 13 is provided at the bottom of the conveying pipe 1, which is located to the right of the rightmost inner ring groove 11. A drive motor 14 is fixedly installed at the left end of the conveying pipe 1. The drive motor 14 is connected to the conveying shaft 2 through a reducer 15.

[0032] In use, the equipment is started, and the drive motor 14 drives the conveyor shaft 2 to rotate. The conveyor shaft 2 drives the first spiral blade 31 and the second spiral blade 32 to rotate, and the semi-solid material is added into the conveying pipe 1 through the feeding hopper 12. The first spiral blade 31 and the second spiral blade 32 rotate spirally to push the material. At the same time, since the clamping post 41 is inserted between the first spiral blade 31 and the second spiral blade 32, the first spiral blade 31 and the second spiral blade 32 drive the inner rotating ring 4 to rotate synchronously through the clamping post 41. Since two sets of telescopic seals 33 are provided between the first spiral blade 31 and the second spiral blade 32, an adjustable sealing space is formed between the first spiral blade 31 and the second spiral blade 32 during conveying. Simultaneously, gas or liquid can be introduced into the sealed gap. If the material needs to be kept at a low temperature during the conveying process, low-temperature water can be injected. Under pressure, the first spiral blade 31 and the second spiral blade 32 slide relative to the conveying shaft 2 and move away from each other. This causes the overall width of the conveying spiral assembly 3 to increase, thereby reducing the conveying gap and generating axial compression on the semi-solid material, which is then compressed 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 compression can compress the particle spacing of the material, thereby breaking the viscous bond between the materials and making them looser. This enhances the flowability of the material, allowing it to be conveyed more smoothly, improving conveying efficiency, reducing adhesion between the material and the cylinder wall, and ensuring smoother material flow. As the first spiral blade 31 and the second spiral blade 32 move away from each other, they also move away from the retaining post 41. At this time, the inner rotating ring 4 does not rotate with the first spiral blade 31 and the second spiral blade 32, allowing the material to be stably compressed onto the inner rotating ring 4. Then, the adjustable sealing space is drained, and under the action of the top spring 36, the first spiral blade 31 and the second spiral blade 32 come together. When the first spiral blade 31 or the second spiral blade 32 contacts the retaining post 41 again... The first spiral blade 31 and the second spiral blade 32 drive the inner rotating ring 4 to rotate again through the locking post 41. As the first spiral blade 31 and the second spiral blade 32 continue to close together, the locking post 41 pushes the inner rotating ring 4 to rotate relative to the conveying shaft 2. The inner rotating ring 4 generates a brief rapid rotation, which quickly turns over the material on it, ensuring 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 deflector 16 causes the inner rotating ring 4 to generate micro-vibration through the deflector groove 42, which can more effectively turn over the material and prevent the material from sticking excessively to the inner rotating ring 4. Therefore, the tubular screw conveyor of the present invention can realize high-speed conveying of semi-solid materials without causing blockage.

[0033] Since the inner rotating ring 4 rotates together with the first spiral blade 31 and the second spiral blade 32, if it is fixed, the material will easily get stuck in the contact part between the clamping post 41 and the first spiral blade 31 and the second spiral blade 32. However, the first spiral blade 31 and the second spiral blade 32 of this invention can move away from each other, which means they will be displaced relative to the inner rotating ring 4. This can push and scrape the material in the contact part outward, ensuring that the semi-solid material will not always be stuck in the contact part, resulting in a good conveying effect.

[0034] In embodiment two, based on the above embodiment, an outer guide bar 21 is provided on the outer surface of the conveying shaft 2. The outer surface of the outer guide bar 21 is provided with a rounded chamfer. The inner sides of the first spiral blade 31 and the second spiral blade 32 are provided with guide grooves 38. The outer guide bar 21 is sealed and inserted into the guide grooves 38.

[0035] By setting the outer guide bar 21 and the guide groove 38, the conveyor shaft 2 can drive the first spiral blade 31 and the second spiral blade 32 to rotate, while the first spiral blade 31 and the second spiral blade 32 can slide stably relative to the conveyor shaft 2. Moreover, the rounded chamfer design makes it less likely for materials to get stuck.

[0036] In embodiment three, based on the above embodiments, a support ring 34 is welded to the left end of the first spiral blade 31 and the right end of the second spiral blade 32. The support ring 34 has a spiral groove inside, and a connecting rotating ring 35 is inserted into the spiral groove. An installation ring 37 is fixedly installed on the outside of the spiral groove. The installation ring 37 clamps the connecting rotating ring 35 in the spiral groove. A top spring 36 is fixedly installed between the installation ring 37 and the inner wall of the conveying pipe 1.

[0037] By setting the support ring 34, the thrust of the top spring 36 can be transmitted more stably to the first spiral plate 31 and the second spiral plate 32, and by setting the connecting rotating ring 35, the top spring 36 will not affect the rotation of the first spiral plate 31 and the second spiral plate 32.

[0038] Example 4, based on the above examples, also includes a hollow design inside the conveying shaft 2, with an inner guide tube 5 inserted inside the conveying shaft 2, and a branch tube 51 provided on the outside of the inner guide tube 5, the branch tube 51 passing through the telescopic seal 33 on the inside.

[0039] Furthermore, a rotary sealing joint 52 is fixedly installed at the right end of the conveyor shaft 2, and the inner guide tube 5 is connected to the rotary sealing joint 52.

[0040] By setting the inner conduit 5 and the branch tube 51, liquid or gas can be injected into the adjustable sealed space quickly and evenly, so that the first spiral blade 31 and the second spiral blade 32 are subjected to uniform and stable force.

[0041] Example 5, based on the above examples, further includes a compression gap between the two sets of telescopic seals 33 and the edge of the first spiral plate 31. This design ensures that the telescopic seals 33 do not contact the inner wall of the conveying pipe 1 when stretched or folded, thus not increasing the conveying friction.

[0042] Example 6, based on the above examples, further includes a telescopic seal 33 composed of a spiral rib 331 and a spiral telescopic piece 332, wherein the spiral telescopic piece 332 is fixedly connected between the first spiral piece 31 and the second spiral piece 32, and the spiral rib 331 is disposed in the middle of the spiral telescopic piece 332.

[0043] Furthermore, after the locking post 41 is inserted between the first spiral blade 31 and the second spiral blade 32, it presses against the outer surface of the spiral rib 331. This design can improve the stability of the spiral rib 331.

[0044] The spiral telescopic plate 332 achieves telescopic sealing, and the spiral rib 331 provides internal support to prevent the spiral telescopic plate 332 from over-expanding and contacting the inner wall of the delivery pipe 1 when liquid or gas is injected.

[0045] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those 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 invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded 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, The conveying pipe (1) is rotatably mounted with a conveying shaft (2), 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 blade (31) and a second spiral blade (32). Two sets of telescopic seals (33) are provided between the first spiral blade (31) and the second spiral blade (32). Top springs (36) are provided between the first spiral blade (31) and the second spiral blade (32) and the inner wall of the conveying pipe (1). The inner wall of the conveying pipe (1) has multiple sets of inner ring grooves (11). The spacing between adjacent inner ring grooves (11) is the same as the pitch of the first spiral blade (31) and the second spiral blade (32). An inner rotating ring (4) is rotatably installed inside the inner ring groove (11). The inner diameter of the inner rotating ring (4) is the same as the inner diameter of the conveying pipe (1). A locking post (41) is provided on the inner wall of the inner rotating ring (4). The locking post (41) is inserted between the first spiral blade (31) and the second spiral blade (32). Multiple sets of eccentric grooves (42) are circumferentially formed on the outer surface of the inner rotating ring (4). Several inner eccentric blades are provided on the inner wall of the inner ring groove (11). (16) The inner paddle (16) is inserted into the paddle groove (42). The conveying shaft (2) has a hollow interior design. An inner guide tube (5) is inserted into the inside of the conveying shaft (2). A branch tube (51) is provided on the outside of the inner guide tube (5). The branch tube (51) passes through the telescopic seal (33) on the inside. An adjustable sealing space is formed between the first spiral blade (31) and the second spiral blade (32). Through the arrangement of the inner guide tube (5) and the branch tube (51), liquid or gas can be injected into the adjustable sealing space quickly and evenly, so that the first spiral blade (31) and the second spiral blade (32) are subjected to uniform and stable force.

2. The tubular screw conveyor according to claim 1, characterized in that, The top of the conveying pipe (1) is provided with a feeding hopper (12), which is located on the left side of the leftmost inner ring groove (11). The bottom of the conveying pipe (1) is provided with a discharging hopper (13), which is located on the right side of the rightmost inner ring groove (11). The left end of the conveying pipe (1) is fixedly installed with a drive motor (14), which is connected to the conveying shaft (2) through a reducer (15).

3. A 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 a rounded chamfer. The inner sides of the first spiral blade (31) and the second spiral blade (32) are provided with guide grooves (38), and the outer guide bar (21) is sealed and inserted into the guide grooves (38).

4. A tubular screw conveyor according to claim 3, characterized in that, Support rings (34) are welded to the left end of the first spiral blade (31) and the right end of the second spiral blade (32). A spiral groove is opened inside the support ring (34), and a connecting rotating ring (35) is inserted into the spiral groove. An installation ring (37) is fixedly installed on the outside of the spiral groove. The installation ring (37) clamps the connecting rotating ring (35) in the spiral groove. A top spring (36) is fixedly installed between the installation ring (37) and the inner wall of the conveying pipe (1).

5. A tubular screw conveyor according to claim 2, characterized in that, A rotary sealing joint (52) is fixedly installed at the right end of the conveying shaft (2), and the inner guide tube (5) is connected to the rotary sealing joint (52).

6. A tubular screw conveyor according to claim 1, characterized in that, A compression gap is provided between the two sets of telescopic seals (33) and the edge of the first spiral plate (31).

7. A tubular screw conveyor according to claim 6, characterized in that, The telescopic seal (33) is composed of a spiral rib (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 rib (331) is located in the middle of the spiral telescopic piece (332).

8. A tubular screw conveyor according to claim 7, characterized in that, After the locking pin (41) is inserted between the first spiral plate (31) and the second spiral plate (32), it presses against the outer surface of the spiral bone strip (331).

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