An adjustable length auger conveyor mechanism

Abstract

The application discloses a length-adjustable screw conveying mechanism and relates to the technical field of screw conveyors, which comprises a fixed conveying inner cylinder serving as a main body bearing, a rotating shaft rotatably installed in the inside of the fixed conveying inner cylinder, a screw telescopic rod, a screw strip fixedly installed on the outer wall of the screw telescopic rod, and a screw transmission pair formed by the screw strip and a screw groove in mesh with each other. The screw telescopic rod, the rotating shaft and the screw groove and the screw strip in mesh with each other constitute a linkage telescopic structure, and the power transmission path is switched through a transmission adjusting mechanism, so that the working height of the telescopic conveying outer cylinder and the second screw blade can be quickly changed, the conveying stroke of the whole machine can be adjusted, a single device can be adapted to various material lifting working conditions, multiple different specification devices need not be equipped, production investment and operation and maintenance costs are effectively reduced, the production line downtime is reduced, the operation continuity is improved, and the device service life is prolonged.

Description

Technical Field

[0001] This invention relates to the field of screw conveyor technology, specifically to an adjustable-length screw conveyor mechanism. Background Technology

[0002] Vertical screw conveyors are core general-purpose equipment in the field of bulk material conveying. With their advantages such as compact structure, good sealing, no dust pollution, and stable conveying, they are widely used in many industries such as mining, building materials, chemicals, food, and metallurgy. They are mainly used to realize the vertical lifting and transfer of powdery and granular materials and are an indispensable key equipment in industrial automated material conveying production lines. Compared with inclined conveying equipment, vertical screw conveyors have a smaller footprint and higher space utilization, which can effectively meet the basic production needs of vertical material lifting and have extremely high engineering application value.

[0003] Currently, most conventional vertical screw conveyors on the market adopt a fixed integral structure design. Their overall height and screw conveying stroke are fixed parameters preset by the factory. After the equipment is assembled, the height cannot be adjusted according to actual operation needs. This type of fixed vertical screw conveyor can only be adapted to material lifting operation scenarios at a single height. The range of operation is fixed, and the equipment has extremely poor versatility.

[0004] In actual industrial production scenarios, different production stations and processing steps have different requirements for the material lifting height. At the same time, scenarios such as production line modification, equipment adaptation, and material transfer docking all require matching different material lifting heights. In response to the above-mentioned variable operating conditions, existing fixed vertical screw conveyors cannot achieve height adaptive adjustment. In order to meet the material conveying needs of different heights, enterprises can only equip multiple screw conveyors of different height specifications or frequently change equipment with appropriate heights for operation.

[0005] Existing technical solutions have many substantial flaws in practical applications: Firstly, the purchase and storage of multiple pieces of equipment of different specifications significantly increases the company's equipment procurement costs, site storage costs, and equipment maintenance costs, resulting in idle and wasted equipment resources. Secondly, the frequent replacement of conveyor equipment during operation requires a series of operations such as equipment disassembly, alignment, debugging, and calibration, which greatly prolongs the operation interruption time, reduces the overall efficiency of material conveying, and cannot adapt to the continuous and efficient industrial production rhythm. Third, frequent disassembly and assembly of equipment can easily cause wear and tear on equipment parts and deviations in installation accuracy, shortening the service life of the equipment, while increasing the intensity of manual operation and the risk of equipment failure. Fourth, the equipment has poor adaptability and cannot be quickly connected to feeding and discharging equipment of different heights, which can easily cause problems such as material transfer blockage and leakage, further affecting the stability of material conveying and the quality of operation. Summary of the Invention

[0006] Therefore, the purpose of this invention is to provide an adjustable-length spiral conveying mechanism to solve the technical problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: an adjustable length spiral conveying mechanism, comprising a fixed conveying inner cylinder that serves as the main load-bearing component, a rotating shaft rotatably installed inside the fixed conveying inner cylinder, a spiral groove being formed on the inner side wall of the rotating shaft, and a spiral strip being fixedly installed on the outer wall of the spiral telescopic rod, wherein the spiral strip and the spiral groove mesh with each other to form the spiral transmission pair; The pitch and direction of the spiral strip and spiral groove are consistent with the pitch and direction of the first spiral blade and the second spiral blade. A telescopic conveying outer cylinder that is movably fitted onto the outside of the fixed inner conveying cylinder and can be raised and lowered along its axial direction; It also includes a spiral telescopic rod that is coaxially disposed inside the rotating shaft and can make a spiral lifting and lowering motion relative to the rotating shaft. A central cross transmission rod is inserted inside the spiral telescopic rod. The central cross transmission rod and the spiral telescopic rod form a connection structure that can slide relative to each other axially and transmit synchronously radially. A first spiral blade fixed to the outside of the rotating shaft for conveying materials, and a second spiral blade fixed to the outside of the spiral telescopic rod and cooperating with the first spiral blade for conveying materials; It also includes a feed hopper set at the bottom of the fixed conveyor inner cylinder for feeding materials, a discharge pipe installed at the top of the telescopic conveyor outer cylinder for discharging materials, and a transmission adjustment mechanism that can switch transmission states to realize two working modes: equipment height adjustment and material conveying. The spiral telescopic rod and the rotating shaft are equipped with a spiral transmission pair to realize the spiral transmission between the two and drive the spiral telescopic rod to rise and fall in a spiral manner. The second spiral blade is connected to the telescopic conveying outer cylinder and can drive it to rise and fall synchronously. A connecting plate is fixedly connected to the top of the spiral telescopic rod, and the second spiral blade is fixed to the spiral telescopic rod as a whole through the connecting plate; The top end of the spiral telescopic rod is connected to the telescopic conveying outer cylinder by a bearing, forming an assembly structure that can rotate circumferentially and is synchronously limited axially. An elastic strip is fixedly provided on the edge of the second spiral blade. The elastic strip is elastically and tightly fitted to the inner wall of the fixed conveying inner cylinder and the inner wall of the telescopic conveying outer cylinder, respectively, to seal the gap between the cylinder bodies. The transmission adjustment mechanism includes a drive motor, a hexagonal transmission rod, an axial sliding gear, a first gear, a second gear, a sliding adjustment fork, a lead screw, and a rotating handle; The output end of the drive motor is fixedly connected to the hexagonal transmission rod, and the axial sliding gear is slidably sleeved on the outside of the hexagonal transmission rod; The first gear is connected to the central cross-shaped transmission rod, and the second gear is connected to the rotating shaft. The sliding adjustment fork is engaged with the axial sliding gear, and the sliding adjustment fork is threaded onto the outside of the lead screw. A rotating handle is fixedly installed at the end of the lead screw. Rotating the handle can drive the lead screw to rotate, thereby driving the sliding adjustment fork and the axial sliding gear to move axially along the hexagonal transmission rod; When the axial sliding gear meshes only with the first gear, the mechanism enters the height adjustment mode; when the axial sliding gear meshes with both the first and second gears simultaneously, the mechanism enters the material conveying mode. It also includes a bottom cylinder, which is fixedly installed at the bottom of the fixed conveying inner cylinder. The bottom cylinder is used to accommodate and install the transmission adjustment mechanism. Several support legs are fixedly installed on the outer side wall of the bottom cylinder. The support legs are evenly distributed along the circumference of the bottom cylinder and are used to support and position the entire conveying mechanism.

[0008] In summary, the present invention has the following main beneficial effects: 1. This invention relies on a rotating shaft, a spiral telescopic rod, and intermeshing spiral grooves and spiral strips to form a linked telescopic structure. By switching the power transmission path through a transmission adjustment mechanism, the working height of the telescopic conveying outer cylinder and the second spiral blade can be quickly changed, realizing adjustable conveying stroke of the whole machine. This structure allows a single device to be adapted to various material lifting conditions, eliminating the need for multiple devices of different specifications, effectively reducing production input and maintenance costs. At the same time, it eliminates cumbersome processes such as equipment disassembly, alignment, and calibration, reducing production line downtime, improving operational continuity, and avoiding component wear and installation errors caused by frequent disassembly and assembly, thus extending the equipment's service life. 2. After the height is adjusted, the central cross transmission rod and the rotating shaft can maintain synchronous operation, allowing the first and second spiral blades to work together, ensuring balanced material conveying power and stable operation. The elastic strip on the outer side of the second spiral blade can adaptively fit and fix the inner wall of the conveying inner cylinder and the telescopic conveying outer cylinder, making up for the gaps caused by the extension and retraction of the cylinder, effectively preventing material jamming, slippage, and leakage. The entire machine can precisely adjust the discharge height according to the docking equipment, improving the equipment docking adaptability and further optimizing the material conveying effect and equipment operation reliability. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the cross-sectional structure of the present invention; Figure 2 This is a cross-sectional view of the entire invention; Figure 3 For the present invention Figure 2Enlarged view of point A; Figure 4 For the present invention Figure 2 Enlarged view of point B; Figure 5 For the present invention Figure 2 Enlarged view of point C; Figure 6 This is a cross-sectional structural diagram of the fixed conveying inner cylinder of the present invention; Figure 7 For the present invention Figure 6 Enlarged view of point D; Figure 8 This is a cross-sectional structural diagram of the telescopic conveying outer cylinder of the present invention; Figure 9 This is an enlarged exploded view of a portion of the structure of the present invention; Figure 10 This is a partial enlarged cross-sectional view of the present invention; Figure 11 This is a schematic diagram showing the installation state of the bottom cylinder and the transmission adjustment mechanism of the present invention; Figure 12 This is a schematic diagram of the overall appearance and structure of the present invention.

[0010] In the picture: 1. Fixed conveying inner cylinder; 2. Rotating shaft; 201. Spiral groove; 3. First spiral blade; 4. Telescopic conveyor outer cylinder; 5. Spiral telescopic rod; 501. Spiral strip; 6. Connecting plate; 7. Second spiral blade; 8. Central cross-shaped transmission rod; 9. Transmission adjustment mechanism; 901. Drive motor; 902. Hexagonal transmission rod; 903. Axial sliding gear; 904. First gear; 905. Second gear; 906. Sliding adjustment fork; 907. Lead screw; 908. Rotating handle; 10. Feed hopper; 11. Discharge pipe; 12. Base tube; 13. Elastic strip; 14. Support leg. Detailed Implementation

[0011] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0012] The embodiments of the present invention will now be described.

[0013] Example like Figure 1-12As shown, this embodiment provides an adjustable length spiral conveying mechanism, which is composed of a fixed inner conveying cylinder 1, a rotating shaft 2, a first spiral blade 3, a telescopic outer conveying cylinder 4, a spiral telescopic rod 5, a connecting plate 6, a second spiral blade 7, a central cross transmission rod 8, a transmission adjustment mechanism 9, a feed hopper 10, a discharge pipe 11, a bottom cylinder 12, an elastic strip 13, and support legs 14.

[0014] The bottom cylinder 12 is fixedly installed at the bottom of the fixed conveying inner cylinder 1. Multiple support legs 14 are evenly fixed around the outer side wall of the bottom cylinder 12. The entire equipment is stably supported and positioned by the support legs 14. The transmission adjustment mechanism 9 is arranged in the internal space of the bottom cylinder 12. A feed hopper 10 is installed through the bottom side wall of the fixed conveying inner cylinder 1. The feed hopper 10 is connected to the internal cavity of the fixed conveying inner cylinder 1 and is used to feed powdery or granular materials into the equipment.

[0015] A rotating shaft 2 is rotatably mounted at the center of the fixed conveying inner cylinder 1. A first spiral blade 3 is fixedly installed on the outer wall of the rotating shaft 2. The outer edge of the first spiral blade 3 slides against the inner wall of the fixed conveying inner cylinder 1. A spiral groove 201 is integrally machined on the inner wall of the rotating shaft 2. A telescopic conveying outer cylinder 4 is movably sleeved on the outer side of the fixed conveying inner cylinder 1. The telescopic conveying outer cylinder 4 can move up and down along the axial direction of the fixed conveying inner cylinder 1. A discharge pipe 11 is fixedly installed at the top of the telescopic conveying outer cylinder 4. The discharge pipe 11 is used to discharge the lifted material outward.

[0016] A spiral telescopic rod 5 is coaxially arranged inside the rotating shaft 2. A spiral strip 501 is fixedly provided on the outer wall of the spiral telescopic rod 5. The spiral strip 501 meshes with the spiral groove 201 on the inner side of the rotating shaft 2 to form a spiral transmission pair. The pitch and direction of the spiral strip 501 and the spiral groove 201 are consistent with the pitch and direction of the first spiral blade 3 and the second spiral blade 7. A connecting plate 6 is fixedly connected to the top of the spiral telescopic rod 5. The second spiral blade 7 is fixedly assembled on the outer side of the connecting plate 6. The second spiral blade 7 is stacked on top of the first spiral blade 3. The two work together to complete the material conveying operation. The top of the spiral telescopic rod 5 is connected to the telescopic conveying outer cylinder 4 through a bearing. The two form a structure that can rotate circumferentially and is synchronously limited axially. When the spiral telescopic rod 5 rises and falls axially, it can synchronously drive the telescopic conveying outer cylinder 4 to rise and fall together.

[0017] Several elastic strips 13 are fixedly installed at the edge of the second spiral blade 7. The elastic strips 13 can undergo elastic deformation and fit tightly against the inner wall of the fixed conveying inner cylinder 1 and the inner wall of the telescopic conveying outer cylinder 4 respectively. This can effectively fill the gap generated after the cylinder expands and contracts, and prevent the material from slipping, getting stuck and leaking.

[0018] A central cross transmission rod 8 is inserted inside the spiral telescopic rod 5. The central cross transmission rod 8 and the spiral telescopic rod 5 are connected in a way that allows relative sliding in the axial direction and synchronous transmission in the radial direction. When the central cross transmission rod 8 rotates, it can drive the spiral telescopic rod 5 to rotate synchronously. At the same time, the two will not interfere with the axial telescopic movement.

[0019] The transmission adjustment mechanism 9 includes a drive motor 901, a hexagonal transmission rod 902, an axial sliding gear 903, a first gear 904, a second gear 905, a sliding adjustment fork 906, a lead screw 907, and a rotating handle 908. The output end of the drive motor 901 is fixedly connected to the hexagonal transmission rod 902. The axial sliding gear 903 is slidably sleeved on the outside of the hexagonal transmission rod 902 and can slide along the axial direction of the hexagonal transmission rod 902. The first gear 904 is connected to the central cross transmission rod 8, and the second gear 905 is connected to the rotating shaft 2. The sliding adjustment fork 906 is engaged with the axial sliding gear 903 and threaded onto the outside of the lead screw 907. The end of the lead screw 907 is fixedly mounted with a rotating handle 908.

[0020] The working principle of the present invention is as follows: In the initial state of use, the telescopic conveying outer cylinder 4 is located outside the fixed conveying inner cylinder 1. The top side of the telescopic conveying outer cylinder 4 is inclinedly provided with a discharge pipe 11, and the bottom side of the fixed conveying inner cylinder 1 is provided with a feed hopper 10. At this time, the distance between the feed hopper 10 and the discharge pipe 11 is the shortest distance. Specifically, a rotating shaft 2 is rotatably connected to the center of the fixed conveying inner cylinder 1, and a first spiral blade 3 is fixed on the outside of the rotating shaft 2, wherein the outside of the first spiral blade 3 slides against the inner wall of the fixed conveying inner cylinder 1. The second spiral blade 7 is fixedly connected to the connecting plate 6 through its top end, and the connecting plate 6 is fixed to the top end of the spiral telescopic rod 5. The spiral telescopic rod 5 is located inside the rotating shaft 2. The spiral strip 501 fixed on the outside of the spiral telescopic rod 5 and the spiral groove 201 opened on the inside of the rotating shaft 2 are spirally engaged with each other, and the second spiral blade 7 is superimposed on the first spiral blade 3. The pitch and direction of the spiral strip 501 and the spiral groove 201 are consistent with the pitch and direction of the first spiral blade 3 and the second spiral blade 7. When the overall height needs to be changed to adapt to different feeding heights, the rotation of the handle 908 of the transmission adjustment mechanism 9 drives the lead screw 907 to rotate, thereby driving the sliding adjustment fork 906, which has radial limit engagement on the outer thread of the lead screw 907, to slide axially. At this time, the sliding adjustment fork 906 descends and simultaneously drives the axial sliding gear 903 to descend axially along the hexagonal transmission rod 902, so that the outer teeth of the axial sliding gear 903 disengage from the second gear 905 and only mesh with the first gear 904 for transmission. At this time, the rotating shaft 2 no longer rotates. Then the drive motor 901 is started. The output end of the drive motor 901 is connected to the hexagonal transmission rod 902, which is driven by the meshing of the axial sliding gear 903 and the first gear 904. At this time, the central cross transmission rod 8 rotates. In other words, since the central cross transmission rod 8 is located inside the spiral telescopic rod 5, it is axially sliding and radially limited connected with the spiral telescopic rod 5. Therefore, the rotation of the central cross transmission rod 8 will drive the spiral telescopic rod 5 to rotate. When the spiral telescopic rod 5 rotates, under the meshing limit between the spiral strip 501 and the spiral groove 201 fixed on its outer wall, the spiral telescopic rod 5 will spirally rise relative to the rotating shaft 2. At the same time, the spiral telescopic rod 5 slides axially relative to the central cross transmission rod 8, avoiding axial sliding interference and not affecting the radial transmission effect. When the spiral telescopic rod 5 spirals upward, the spiral telescopic rod 5 will drive the second spiral blade 7 to spiral upward synchronously through the connecting plate 6. As mentioned above, the pitch and direction of the spiral strip 501, the first spiral blade 3, and the second spiral blade 7 are consistent. As a result, the second spiral blade 7 will spiral upward relative to the first spiral blade 3. The top of the second spiral blade 7 gradually moves away from the top of the first spiral blade 3, while the rest remains in an overlapping state. Furthermore, the top of the spiral telescopic rod 5 is radially movable and axially limited by the bearing and the telescopic conveying outer cylinder 4. In other words, at this time, the telescopic conveying outer cylinder 4 will rise synchronously with the second spiral blade 7 without rotating. Thus, the discharge pipe 11 set at the top of the telescopic conveying outer cylinder 4 gradually moves away from the feed hopper 10, thereby completing the overall height adjustment process. In summary, the present invention can flexibly change the overall conveying length and material lifting height, and can adapt to the material lifting needs of different workstations and processes without changing the equipment. It completely solves the problems of fixed height and poor adaptability of traditional fixed vertical screw conveyors, and has a wider range of applicable scenarios. Furthermore, when the height of the discharge pipe 11 is adjusted to the specified height, the operator rotates the handle 908 in the opposite direction. According to the transmission adjustment mechanism 9, the axial sliding gear 903 rises and meshes with the second gear 905. At this time, the lower half of the axial sliding gear 903 is still meshed with the first gear 904. That is to say, at this time, the axial sliding gear 903 is simultaneously meshed with the first gear 904 and the second gear 905. At this time, the rotation of the drive motor 901 will simultaneously drive the first gear 904 and the second gear 905 to rotate synchronously. Thus, the central cross transmission rod 8 and the rotating shaft 2 rotate synchronously. Since the central cross transmission rod 8 and the rotating shaft 2 rotate synchronously in the same direction and there is no speed difference between the central cross transmission rod 8 and the rotating shaft 2, the spiral telescopic rod 5 will not move axially at this time, but will only rotate synchronously in the same direction with the central cross transmission rod 8 and the rotating shaft 2. Thus, the rotating shaft 2 drives the first spiral blade 3 to rotate, and the spiral telescopic rod 5 drives the second spiral blade 7 to rotate. In other words, at this time, the first spiral blade 3 and the second spiral blade 7 rotate at the same speed and in the same direction, so that the first spiral blade 3 and the second spiral blade 7 together play the role of conveying and lifting materials. Meanwhile, an elastic strip 13 is fixed at the edge of the surface of the second spiral blade 7. The elastic strip 13 on the part of the second spiral blade 7 located on the inner wall of the fixed conveying inner cylinder 1 deforms elastically and adheres to the inner wall of the fixed conveying inner cylinder 1. The elastic strip 13 on the part of the second spiral blade 7 located on the inner wall of the telescopic conveying outer cylinder 4 also adheres to the inner wall of the telescopic conveying outer cylinder 4. In other words, by setting the elastic strip 13, the effect of the gap between the outer side of the second spiral blade 7 and the inner wall of the telescopic conveying outer cylinder 4 after the telescopic conveying outer cylinder 4 is extended relative to the fixed conveying inner cylinder 1 is eliminated, thus ensuring the stability of the overall lifting and conveying of materials and avoiding the phenomenon of materials slipping through the gap or getting stuck due to the gap.

[0021] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the invention and are not intended to limit it. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the invention, but such modifications, substitutions, and variations are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. An adjustable-length screw conveyor mechanism, characterized in that: It includes a fixed inner conveying cylinder (1) that plays the main load-bearing role, a rotating shaft (2) that is rotatably installed inside the fixed inner conveying cylinder (1), and a telescopic outer conveying cylinder (4) that is movably sleeved on the outside of the fixed inner conveying cylinder (1) and can be raised and lowered along its axial direction. It also includes a spiral telescopic rod (5) coaxially disposed inside the rotating shaft (2) and capable of spiral lifting relative to the rotating shaft (2), a first spiral blade (3) fixed to the outside of the rotating shaft (2) for conveying materials, and a second spiral blade (7) fixed to the outside of the spiral telescopic rod (5) and cooperating with the first spiral blade (3) to convey materials. It also includes a feed hopper (10) set at the bottom of the fixed conveying inner cylinder (1) for feeding materials, a discharge pipe (11) installed at the top of the telescopic conveying outer cylinder (4) for discharging materials, and a transmission adjustment mechanism (9) that can switch transmission states and realize two working modes of equipment height adjustment and material conveying respectively. The spiral telescopic rod (5) and the rotating shaft (2) are equipped with a spiral transmission pair to realize the spiral transmission between the two and drive the spiral telescopic rod (5) to rise and fall. The second spiral blade (7) is connected to the telescopic conveying outer cylinder (4) and can drive it to rise and fall synchronously.

2. The adjustable-length screw conveyor mechanism according to claim 1, characterized in that: The inner wall of the rotating shaft (2) is provided with a spiral groove (201), and the outer wall of the spiral telescopic rod (5) is fixedly installed with a spiral strip (501). The spiral strip (501) and the spiral groove (201) mesh with each other to form the spiral transmission pair. The pitch and direction of the spiral strip (501) and spiral groove (201) are consistent with the pitch and direction of the first spiral blade (3) and the second spiral blade (7).

3. The adjustable-length screw conveyor mechanism according to claim 1, characterized in that: The spiral telescopic rod (5) is internally fitted with a central cross transmission rod (8), and the central cross transmission rod (8) and the spiral telescopic rod (5) form a connection structure that can slide relative to each other axially and transmit synchronously radially.

4. The adjustable-length screw conveyor mechanism according to claim 1, characterized in that: The transmission adjustment mechanism (9) includes a drive motor (901), a hexagonal transmission rod (902), an axial sliding gear (903), a first gear (904), a second gear (905), a sliding adjustment fork (906), a lead screw (907), and a rotating handle (908). The output end of the drive motor (901) is fixedly connected to the hexagonal transmission rod (902), and the axial sliding gear (903) is slidably sleeved on the outside of the hexagonal transmission rod (902).

5. The adjustable-length screw conveyor mechanism according to claim 4, characterized in that: The first gear (904) is connected to the central cross transmission rod (8), and the second gear (905) is connected to the rotating shaft (2). The sliding adjustment fork (906) is engaged with the axial sliding gear (903), and the sliding adjustment fork (906) is threaded onto the outside of the lead screw (907). A rotating handle (908) is fixedly installed at the end of the lead screw (907).

6. The adjustable-length screw conveyor mechanism according to claim 5, characterized in that: Rotating the handle (908) can drive the lead screw (907) to rotate, thereby driving the sliding adjustment fork (906) and the axial sliding gear (903) to move axially along the hexagonal transmission rod (902); When the axial sliding gear (903) meshes only with the first gear (904), the mechanism enters the height adjustment mode; when the axial sliding gear (903) meshes with both the first gear (904) and the second gear (905) at the same time, the mechanism enters the material conveying mode.

7. The adjustable-length screw conveyor mechanism according to claim 1, characterized in that: The top end of the spiral telescopic rod (5) is fixedly connected to a connecting plate (6), and the second spiral blade (7) is fixed to the spiral telescopic rod (5) as a whole through the connecting plate (6); The top end of the spiral telescopic rod (5) is connected to the telescopic conveying outer cylinder (4) by a bearing, forming an assembly structure that can rotate circumferentially and is synchronously limited axially.

8. The adjustable-length screw conveyor mechanism according to claim 1, characterized in that: An elastic strip (13) is fixedly provided on the edge of the second spiral blade (7). The elastic strip (13) is elastically and tightly fitted to the inner wall of the fixed conveying inner cylinder (1) and the inner wall of the telescopic conveying outer cylinder (4) to seal the gap between the cylinders.

9. The adjustable-length screw conveyor mechanism according to claim 1, characterized in that: It also includes a bottom cylinder (12), which is fixedly installed at the bottom of the fixed conveying inner cylinder (1) and is used to accommodate the installation of the transmission adjustment mechanism (9).

10. The adjustable-length screw conveyor mechanism according to claim 9, characterized in that: Several support legs (14) are fixedly installed on the outer wall of the bottom cylinder (12). The support legs (14) are evenly distributed around the bottom cylinder (12) and are used to support and position the entire conveying mechanism.

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