Screw conveyer mounting structure convenient to maintain

The screw conveyor installation structure designed with detachable connection and temporary maintenance port solves the problem of difficult cleaning of impurities on the surface of the screw conveyor rod, realizes convenient maintenance and efficient operation of the equipment, and extends the life of the equipment.

CN223328376UActive Publication Date: 2025-09-12YICHANG LIANSHENG HI-TECH MASCH MFG CO LTD
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Patent Information

Application Number
CN202422247757.2
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-09-13
Publication Date
2025-09-12
Estimated Expiration
2034-09-13

AI Technical Summary

Technical Problem

The spiral conveying rod is in direct contact with the material during the conveying process, which makes it easy for impurities to adhere to and remain on the surface and inner wall of the cylinder, making it difficult to clean. This affects the efficiency and life of the equipment and also poses a safety hazard.

Method used

A screw conveyor installation structure that is easy to maintain is designed, which adopts detachable connections and temporary maintenance ports, allowing cleaning and inspection without disassembling the entire equipment, and combined with sealing components to ensure the sealing of the equipment.

Benefits of technology

It simplifies the maintenance process, reduces costs and risks, extends equipment life, improves conveying efficiency and stability, and avoids material leakage and environmental pollution.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to a convenient-to-maintain screw conveyor mounting structure which comprises a conveying pipeline, an inner barrel used for conveying materials is arranged in the conveying pipeline, supports are detachably connected to the two ends of the conveying pipeline, a screw conveying rod is rotatably arranged in the inner barrel, a supporting seat is arranged on the support on one side, and a screw conveying rod is arranged on the supporting seat. One end of the spiral conveying rod penetrates through the support and extends into the supporting seat, and a driving part is arranged on the support on one side; a plurality of temporary maintenance openings which communicate with one another are formed in the bottom of the conveying pipeline and the bottom of the inner barrel, and a sealing assembly used for sealing the temporary maintenance openings is arranged on the conveying pipeline. And a worker can clean and check the equipment without integrally disassembling the equipment, so that the maintenance difficulty and cost are greatly reduced.
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Description

Technical Field

[0001] The present application relates to the technical field of screw conveyors, and in particular to a screw conveyor installation structure that is easy to maintain. Background Art

[0002] In industrial production, screw conveyors are a common material conveying equipment used in a variety of fields, including food, chemicals, and building materials. Their working principle is that a screw conveyor rod rotates within a closed conveying pipe, pushing the material forward along the pipe, achieving continuous and stable material transportation.

[0003] Over the long term, screw conveyor designs often focus on improving conveying efficiency and stability, while insufficiently considering ease of maintenance. Because the screw conveyor rod comes into direct contact with the material during conveying, and the interior of the conveying pipe is relatively closed, various impurities such as material particles, grease, and moisture easily adhere to and remain on the screw rod surface and inner tube wall. These impurities not only affect conveying efficiency but can also cause corrosion and wear to the equipment, shortening its service life.

[0004] For workers, traditional water injection cleaning methods are not effective in completely removing impurities. Manually cleaning these residual impurities is a time-consuming and labor-intensive task. Due to the limited internal space of the conveying pipeline and the installation of a spiral conveyor rod, the workers' operating range is limited, resulting in blind spots in the cleaning process, making it difficult to completely remove impurities. This can also easily cause scratches to workers, posing a safety hazard.

[0005] In view of the above problems, a screw conveyor installation structure that is easy to maintain is now designed. Utility Model Content

[0006] The embodiment of the present application provides a screw conveyor installation structure that is easy to maintain, so as to solve the problem in the related art that the screw conveyor rod is in direct contact with the material during the conveying process, and the internal space of the conveying pipe is relatively closed, which makes it easy for various impurities to adhere to and remain on the surface of the screw conveyor rod and the inner tube wall, making it inconvenient to clean.

[0007] In a first aspect, a screw conveyor installation structure that is easy to maintain is provided, comprising:

[0008] A conveying pipe, wherein an inner cylinder for material transmission is provided inside the conveying pipe, brackets are detachably connected to both ends of the conveying pipe, a spiral conveying rod is rotatably provided inside the inner cylinder, a support seat is provided on one side of the bracket, one end of the spiral conveying rod passes through the bracket and extends into the inside of the support seat, a driving member is provided on one side of the bracket, and the driving member is detachably connected to the end of the spiral conveying rod passing through the bracket;

[0009] The delivery pipeline and the bottom of the inner cylinder are provided with a plurality of temporary maintenance openings which are interconnected. The delivery pipeline is provided with a sealing assembly for closing the temporary maintenance openings.

[0010] In some embodiments, both ends of the delivery pipe are connected to the bracket by bolts.

[0011] In some embodiments, the inner cylinder is cylindrical and has openings at both ends. The outer diameter of the inner cylinder is the same as the inner diameter of the delivery pipe.

[0012] In some embodiments, the support seat includes a support seat body, and a rolling bearing is disposed inside the support seat body;

[0013] One end of the spiral conveying rod passes through the bracket and the inner ring of the rolling bearing in sequence and extends outwards. A connecting groove is provided at the outwardly extending end of the spiral conveying rod, and a threaded hole is provided on the connecting groove.

[0014] In some embodiments, the driving member includes: a mounting plate disposed on the bracket;

[0015] A reducer is arranged on the mounting plate;

[0016] A drive motor is provided on the reducer, wherein the output shaft of the drive motor is connected to the input shaft of the reducer;

[0017] The output shaft of the reducer extends into the interior of the connecting groove and is connected to the spiral conveying rod through the cooperation of the threaded hole and the bolt.

[0018] In some embodiments, the sealing assembly includes a fixing frame relatively arranged on the conveying pipe, and a sealing cover arranged at the temporary maintenance port, the sealing cover is adapted to the corresponding temporary maintenance port, and the fixing frame and the sealing cover are connected by bolts.

[0019] In some embodiments, a feed hopper and a discharge hopper for loading materials are respectively provided on the conveying pipeline, and a feed port and a discharge port connected to the feed hopper and the discharge hopper are respectively opened on the inner cylinder.

[0020] The present invention provides a screw conveyor installation structure that facilitates maintenance. Through its detachable connection design and provision of a temporary maintenance port, the screw conveyor's maintenance becomes much simpler and faster. Workers can clean and inspect the equipment without having to completely disassemble it, significantly reducing maintenance difficulty and costs.

[0021] Regular cleaning and maintenance can effectively reduce the residual impurities on the spiral conveyor rod and inner cylinder, prevent them from causing corrosion and wear to the equipment, maintain the smoothness of their surface, reduce the resistance during material conveying, improve the efficiency and stability of material conveying, improve the operating efficiency of the equipment, and significantly extend the service life of the equipment.

[0022] Convenient maintenance access reduces the risk of workers operating in confined spaces and avoids safety hazards caused by cleaning blind spots. At the same time, the design of the sealing component ensures the sealing of the conveying pipeline during maintenance, preventing material leakage and environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0024] Figure 1 A schematic diagram of a three-dimensional structure provided in an embodiment of the present application;

[0025] Figure 2 A sectional view of a three-dimensional structure provided in an embodiment of the present application;

[0026] Figure 3 A three-dimensional schematic diagram of the connection structure between the driving member and the support base provided in an embodiment of the present application;

[0027] Figure 4 A three-dimensional schematic diagram of the connection structure between the support base and the spiral conveying rod provided in an embodiment of the present application;

[0028] Figure 5 A three-dimensional schematic diagram of the delivery pipe and inner cylinder structure provided in an embodiment of the present application.

[0029] In the figure: 1. Conveying pipe; 2. Inner tube; 3. Bracket; 4. Screw conveying rod; 41. Connecting groove; 42. Threaded hole; 5. Support seat; 51. Support seat body; 52. Rolling bearing; 6. Driving part; 61. Mounting plate; 62. Reducer; 63. Driving motor; 7. Temporary maintenance port; 8. Sealing assembly; 81. Fixing bracket; 82. Sealing cover; 9. Feed hopper; 10. Discharge hopper. DETAILED DESCRIPTION

[0030] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0031] The embodiment of the present application provides a screw conveyor installation structure that is easy to maintain, which can solve the problem in the related art that the screw conveying rod is in direct contact with the material during the conveying process, and the internal space of the conveying pipeline is relatively closed, which makes it easy for various impurities to adhere to and remain on the surface of the screw conveying rod and the inner tube wall, making it inconvenient to clean.

[0032] See also Figure 1-Figure 3 , a screw conveyor installation structure that is easy to maintain includes: a conveying pipe 1, an inner cylinder 2 for material transmission is provided inside the conveying pipe 1, and brackets 3 are detachably connected at both ends of the conveying pipe 1, a spiral conveying rod 4 is rotatably provided inside the inner cylinder 2, a support seat 5 is provided on one side of the bracket 3, one end of the spiral conveying rod 4 passes through the bracket 3 and extends to the inside of the support seat 5, and a driving member 6 is provided on one side of the bracket 3, and the driving member 6 is detachably connected to one end of the spiral conveying rod 4 passing through the bracket 3; a number of temporary maintenance ports 7 that are interconnected are opened at the bottom of the conveying pipe 1 and the inner cylinder 2, and a sealing component 8 for closing the temporary maintenance port 7 is provided on the conveying pipe 1.

[0033] When the drive element 6 is activated, it provides rotational power to the auger 4. Supported by the support base 5, the auger 4 rotates steadily within the inner barrel 2. As the auger 4 rotates, its spiral blades propel the material within the inner barrel 2 forward, ultimately delivering it to the desired location through the conveying pipe 1.

[0034] The conveying pipe 1 is detachably connected to the bracket 3 at both ends. This design allows the conveying pipe 1 to be easily removed from the bracket 3 when maintenance or component replacement is required, without having to disassemble the entire screw conveyor. Similarly, the drive member 6 and the screw conveying rod 4 are also detachably connected, making it easy to replace or repair the screw conveying rod 4 separately.

[0035] Several interconnected temporary maintenance ports 7 are provided at the bottom of the delivery pipe 1 and inner tube 2, providing convenient access for cleaning and inspecting the interior of the equipment. To clean impurities or inspect the equipment, simply open the sealing assembly 8 and access the delivery pipe 1 and inner tube 2 through the temporary maintenance ports 7. Once the operation is complete, close the sealing assembly 8 to ensure the tightness of the delivery pipe 1.

[0036] The detachable connection design and the provision of a temporary maintenance port 7 make the maintenance of the screw conveyor much simpler and faster. Workers can clean and inspect the equipment without having to dismantle the entire device, greatly reducing the difficulty and cost of maintenance.

[0037] Regular cleaning and maintenance can effectively reduce the residual impurities on the spiral conveying rod 4 and the inner cylinder 2, prevent them from causing corrosion and wear to the equipment, maintain the smoothness of their surface, reduce the resistance during material conveying, improve the efficiency and stability of material conveying, improve the operating efficiency of the equipment, and significantly extend the service life of the equipment.

[0038] The convenient maintenance access reduces the risk of workers operating in a small space and avoids the safety hazards caused by cleaning blind spots. At the same time, the design of the sealing component 8 ensures the sealing of the conveying pipeline 1 during maintenance, preventing material leakage and environmental pollution.

[0039] It should be noted that in this embodiment, both ends of the delivery pipe 1 are connected to the bracket 3 via bolts.

[0040] Bolted connections offer a high degree of flexibility and removability. Compared to traditional welding or fixed connections, bolted connections allow for quick and easy assembly and disassembly of the conveying pipeline 1 and the bracket 3 without the need for special tools or equipment. This is crucial for equipment installation, commissioning, maintenance, and component replacement, significantly improving work efficiency and reducing maintenance costs.

[0041] Secondly, bolted connections offer excellent sealing and stability. By selecting the appropriate bolt specifications, materials, and tightening torque, a tight connection can be ensured between the conveying pipe 1 and the bracket 3, preventing material leakage and the ingress of foreign matter. Furthermore, bolted connections can withstand certain vibration and impact loads, ensuring stable operation of the equipment under harsh operating conditions.

[0042] Specifically, such as Figure 2 As shown, in this embodiment, the inner cylinder 2 is cylindrical and has openings at both ends. The outer diameter of the inner cylinder 2 is the same as the inner diameter of the conveying pipe 1.

[0043] Both ends of the inner barrel 2 are provided with openings to ensure that the material can smoothly enter the inner barrel 2 and move forward under the push of the spiral conveying rod 4, and finally be discharged from the opening at the other end. At the same time, the setting of the openings also facilitates cleaning and inspection of the interior of the inner barrel 2 during maintenance.

[0044] The outer diameter of inner barrel 2 is designed to be the same as or slightly smaller than the inner diameter of conveying pipe 1 (taking into account the necessary clearance to accommodate the seal). This design ensures that inner barrel 2 can be installed tightly inside conveying pipe 1, reducing the risk of material leakage. At the same time, the matching outer and inner diameters also ensure the stability of the material during transportation, avoiding material fluctuations or blockages caused by excessive clearance.

[0045] In one embodiment, Figure 3 and Figure 4As shown, the support seat 5 includes a support seat body 51, and a rolling bearing 52 is arranged inside the support seat body 51; one end of the spiral conveying rod 4 passes through the bracket 3 and the inner ring of the rolling bearing 52 in sequence and extends outward, and a connecting groove 41 is provided at one end of the spiral conveying rod 4 extending outward, and a threaded hole 42 is provided on the connecting groove 41.

[0046] The support base 5 primarily consists of a support base body 51, which serves as the base for supporting and securing other components. The rolling bearing 52 supports the screw conveyor 4 and allows for its smooth rotation. The rolling bearing 52 effectively reduces friction and wear during the rotation of the screw conveyor 4, thereby increasing the service life and operating efficiency of the equipment.

[0047] One end of the spiral conveying rod 4 passes through the bracket 3 and the inner ring of the rolling bearing 52 in sequence and extends outward, ensuring that the spiral conveying rod 4 can rotate stably in the support seat 5 and is convenient for connection with external equipment such as the driving member 6.

[0048] A connecting groove 41 and a threaded hole 42 are located at the outwardly extending end of the screw conveyor rod 4. The connecting groove 41 provides a mounting location for the driver 6, while the threaded hole 42 is used to securely connect the driver 6 to the screw conveyor rod 4 using fasteners such as bolts. This design not only facilitates installation and removal but also ensures a reliable and stable connection.

[0049] It should be further explained that the driving member 6 includes: a mounting plate 61 arranged on the bracket 3; a reducer 62 arranged on the mounting plate 61; a driving motor 63 arranged on the reducer 62, and the output shaft of the driving motor 63 is connected to the input shaft of the reducer 62; the output shaft of the reducer 62 extends to the inside of the connecting groove 41, and is connected to the spiral conveying rod 4 through the cooperation of the threaded hole 42 and the bolt.

[0050] The mounting plate 61 is firmly mounted on the bracket 3 and serves as a support platform for the reducer 62 and the drive motor 63 .

[0051] The reducer 62 is mounted on the mounting plate 61 and is used to reduce the output speed of the drive motor 63 and increase the output torque to meet the speed and torque requirements for the rotation of the screw conveying rod 4. The drive motor 63 serves as a power source, and its output shaft is connected to the input shaft of the reducer 62.

[0052] The output shaft of reducer 62 extends into connecting groove 41, reducing the number of intermediate links in the transmission chain and improving transmission efficiency. Once inside connecting groove 41, the output shaft of reducer 62 is securely connected to the screw conveyor rod 4 via threaded holes 42 and bolts. This connection method offers advantages such as simple structure, easy installation, and reliable connection. During the connection process, ensure that the bolt tightening torque meets the design requirements to ensure a stable and secure connection.

[0053] In actual use, when the driving motor 63 is started, the power is transmitted to the screw conveying rod 4 through the deceleration and torque-increasing effect of the reducer 62, driving the screw conveying rod 4 to rotate.

[0054] As a preferred embodiment, Figure 5 As shown, the sealing assembly 8 in this embodiment includes a fixing frame 81 relatively arranged on the conveying pipe 1, and a sealing cover 82 arranged at the temporary maintenance port 7, the sealing cover 82 is adapted to the corresponding temporary maintenance port 7, and the fixing frame 81 and the sealing cover 82 are connected by bolts.

[0055] The fixing frame 81 serves as a support and fixing structure for the sealing cover 82. The fixing frame 81 provides a stable installation base for the sealing cover 82. The fixing frame 81 is fixed to a suitable position of the conveying pipeline 1 by welding.

[0056] Sealing cover 82 is positioned at temporary maintenance port 7 and fits snugly into the corresponding temporary maintenance port 7. The shape and size of sealing cover 82 are designed based on the specific requirements of temporary maintenance port 7 to ensure it fits snugly over the port and prevent material leakage. A sealing gasket is provided on the inner surface of sealing cover 82, providing a seal that further enhances sealing performance.

[0057] The fixing frame 81 and the sealing cover 82 are connected by bolts. This connection method has the advantages of simple structure, easy installation, and reliable connection.

[0058] The sealing assembly 8 significantly improves the sealing performance of the delivery pipeline 1 at the temporary maintenance port 7. When cleaning or inspecting the interior of the delivery pipeline 1 is necessary, simply loosen the bolts and remove the sealing cover 82, allowing easy access to the interior of the delivery pipeline 1. Once the operation is complete, replace the sealing cover 82 and tighten the bolts to restore the sealing of the delivery pipeline 1. This design not only improves the maintainability of the equipment but also ensures its sealing and safety during normal operation.

[0059] In one embodiment, the conveying pipe 1 is provided with a feed hopper 9 and a discharge hopper 10 for loading materials, and the inner tube 2 is provided with a feed port and a discharge port respectively connected to the feed hopper 9 and the discharge hopper 10. The feed hopper 9 is located at one end of the upper part of the conveying pipe 1, and the discharge hopper 10 is located at the other end of the lower part of the conveying pipe.

[0060] The feed hopper 9 is provided at one end or at an appropriate position of the conveying pipeline 1 , and its main function is to receive external materials and guide them into the inner cylinder 2 inside the conveying pipeline 1 .

[0061] The feed hopper 9 is usually fixed to the conveying pipe 1 by welding. At the same time, the feed hopper 9 and the feed opening on the inner tube 2 need to be tightly matched to prevent material leakage.

[0062] A discharge hopper 10 is located at the other end of the conveying pipe 1 or at an appropriate location. Its primary function is to discharge the material conveyed through the inner barrel 2 from the conveying pipe 1. The discharge hopper 10 is also secured to the conveying pipe 1 by welding. Similarly, the discharge hopper 10 must maintain a tight fit with the discharge port on the inner barrel 2 to ensure that the material is completely discharged without remaining in the conveying pipe 1.

[0063] The inner cylinder 2 is provided with a feed port and a discharge port connected to the feed hopper 9 and the discharge hopper 10. The position and shape of these ports need to be designed according to the specific conditions of the feed hopper 9 and the discharge hopper 10 to ensure that the material can enter and leave the inner cylinder 2 smoothly.

[0064] It should be further explained that, considering the sealing problem of the feed port and the discharge port, in order to prevent material leakage, sealing pads or sealing rings are provided at the feed port and the discharge port to improve the sealing performance.

[0065] It can be understood that, in this embodiment, a positioning block is provided on the inner cylinder 2 , and a positioning groove adapted to the positioning block is provided inside the delivery pipe 1 .

[0066] The cooperation between the positioning block and the positioning groove can ensure that the inner tube 2 is accurately positioned inside the conveying pipe 1. During the assembly process, the positioning block only needs to be aligned with the positioning groove and inserted to quickly complete the positioning of the inner tube 2 without complicated adjustment steps.

[0067] In the description of this application, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0068] It should be noted that, in this application, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0069] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. 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 present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. A screw conveyor installation structure that is easy to maintain, characterized in that: include: A conveying pipe (1), wherein an inner cylinder (2) for material transmission is provided inside the conveying pipe (1), brackets (3) are detachably connected at both ends of the conveying pipe (1), a spiral conveying rod (4) is rotatably provided inside the inner cylinder (2), a support seat (5) is provided on one side of the bracket (3), one end of the spiral conveying rod (4) passes through the bracket (3) and extends into the inside of the support seat (5), a driving member (6) is provided on one side of the bracket (3), and the driving member (6) is detachably connected to one end of the spiral conveying rod (4) passing through the bracket (3); The bottom of the delivery pipe (1) and the inner tube (2) are provided with a plurality of temporary maintenance openings (7) that are in communication with each other, and the delivery pipe (1) is provided with a sealing assembly (8) for closing the temporary maintenance openings (7).

2. A screw conveyor installation structure that is easy to maintain according to claim 1, characterized in that: Both ends of the delivery pipe (1) are connected to the bracket (3) via bolts.

3. The screw conveyor installation structure for easy maintenance according to claim 1, characterized in that: The inner cylinder (2) is cylindrical and has openings at both ends. The outer diameter of the inner cylinder (2) is the same as the inner diameter of the delivery pipe (1).

4. The screw conveyor installation structure for easy maintenance according to claim 1, characterized in that: The support seat (5) comprises a support seat body (51), and a rolling bearing (52) is provided inside the support seat body (51); One end of the spiral conveying rod (4) sequentially passes through the bracket (3) and the inner ring of the rolling bearing (52) and extends outwards. A connecting groove (41) is provided at one end of the spiral conveying rod (4) extending outwards, and a threaded hole (42) is provided on the connecting groove (41).

5. The screw conveyor installation structure for easy maintenance according to claim 4, characterized in that: The driving member (6) comprises: a mounting plate (61) arranged on the bracket (3); A speed reducer (62) disposed on a mounting plate (61); A drive motor (63) is provided on the reducer (62), wherein an output shaft of the drive motor (63) is connected to an input shaft of the reducer (62); The output shaft of the speed reducer (62) extends into the interior of the connecting groove (41) and is connected to the spiral conveying rod (4) through the cooperation of the threaded hole (42) and the bolt.

6. The screw conveyor installation structure for easy maintenance according to claim 1, characterized in that: The sealing assembly (8) comprises a fixing frame (81) arranged relative to the conveying pipe (1), and a sealing cover (82) arranged at the temporary maintenance port (7), wherein the sealing cover (82) is adapted to the corresponding temporary maintenance port (7), and the fixing frame (81) and the sealing cover (82) are connected by bolts.

7. The screw conveyor installation structure for easy maintenance according to claim 1, characterized in that: The conveying pipeline (1) is provided with a feed hopper (9) and a discharge hopper (10) for loading materials, and the inner cylinder (2) is provided with a feed port and a discharge port connected to the feed hopper (9) and the discharge hopper (10).