Large-diameter inner drum spiral body structure and assembling method thereof

Abstract

The invention discloses a large-diameter inner drum spiral body structure and an assembly method thereof, and belongs to the field of mechanical connection structures and assembly processes. The structure comprises a cylindrical inner drum body and a plurality of spiral pieces, the cross section of each spiral piece is in an L shape, each spiral piece is provided with a spiral piece body and a plurality of connecting lugs vertically extending from the edge of the inner diameter of the spiral piece body, and first via holes are formed in the connecting lugs. Second via holes corresponding to the second via holes are formed in the cylinder wall of the inner drum body in the radial direction, and the inner drum body is fixedly connected with the spiral pieces through penetrating fasteners. During assembly, the via holes in the connecting lugs of the spiral pieces are aligned with the via holes in the cylinder wall of the inner drum body, and then the fasteners penetrate through the via holes for pre-fastening; after all the spiral pieces are installed, final fastening is conducted; and finally, the adjacent spiral sheets are welded into a whole. Through the unique L-shaped section and the mechanical connection structure, light-weight and high-stability connection of the large-diameter inner drum is achieved, and the problems that due to the fact that the diameter is increased, the connection rigidity of the spiral pieces is insufficient, and the stability becomes poor are effectively solved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of mechanical connection structure and assembly process, and particularly relates to a connection structure of a large-diameter cylinder and a helical guide vane and an assembly method of the structure. BACKGROUND

[0002] In the cylinder structure related to helical conveying, guiding or storing, it is usually required to fix and connect continuous helical guide vanes outside the cylinder to form a helical channel. For such a structure, a traditional connection method is to insert multiple segmented helical vanes into the grooves processed on the inner wall of the cylinder in sequence, and to position and fix the helical vanes in the radial direction through the groove structure.

[0003] However, this connection method relying on the inner wall groove has inherent limitations. In order to process helical grooves with sufficient depth and ensure the structural strength, the cylinder must have a large wall thickness, which directly leads to excessive weight of the cylinder. When this structure is applied to small-diameter occasions, the weight and processing problems are still within an acceptable range. However, as the diameter of the cylinder increases significantly, the disadvantages will be dramatically magnified if this structure is still used: on the one hand, maintaining a thick wall design to maintain groove depth will increase the overall weight exponentially, making it difficult to meet the lightweight demand; on the other hand, the large diameter leads to a synchronous increase in the size of the helical vane, and the sector angle of its profile is correspondingly reduced (for example, from the commonly seen 70° to about 30°), which makes the number of helical vanes needed significantly increase under the same helical length.

[0004] The increase in the number of helical vanes and the decrease in the connection points of individual helical vanes make it difficult to ensure the positioning accuracy of each helical vane during installation and the overall perpendicularity and stability after connection. The traditional groove connection method cannot provide sufficient reliable constraints at this time, and problems such as insufficient connection stiffness and reduced helical line precision are likely to occur, thereby affecting the function and reliability of the entire helical channel. SUMMARY

[0005] The purpose of the present application is to solve the problem that the increase in the diameter of the cylinder leads to excessive weight of the cylinder, an increase in the number of helical vanes and a decrease in the profile angle of the helical vane when connecting the helical vane through the inner wall groove, and further causes the connection stability and perpendicularity to be difficult to guarantee, and to propose a new solution that is structurally stable, precisely assembled and conducive to lightweight design.

[0006] To achieve the above-mentioned purpose, the technical solution provided by the present application is:

[0007] On the one hand, a large-diameter inner drum helical structure is provided, which includes an inner drum body, a plurality of helical vanes and a plurality of fasteners.

[0008] The plurality of helical vanes spirally surrounds the outer surface of the inner drum body.

[0009] The cross section of the spiral blade is L-shaped, comprising a spiral blade body for forming a guide surface and a plurality of connecting lugs vertically extending from the inner diameter edge of the spiral blade body, and a first through hole is formed on the connecting lug;

[0010] A second through hole corresponding to the first through hole is radially formed on the cylinder wall of the inner drum body;

[0011] The fastener sequentially penetrates the first through hole on the connecting lug and the second through hole on the inner drum body, and is fastened on the inner cavity side of the inner drum body, so as to fixedly connect the spiral blade with the inner drum body.

[0012] Further, the fastener is a bolt and a nut, the bolt sequentially penetrates the first through hole and the second through hole from outside to inside, and extends into the inner cavity of the inner drum body and is locked by the nut.

[0013] Further, a spiral groove for radially positioning the spiral blade is arranged on the outer surface of the inner drum body.

[0014] Further, the connecting lug is attached to the outer surface of the cylinder wall of the inner drum body.

[0015] On the other hand, a method for assembling the large-diameter inner drum spiral structure is provided, comprising the following steps:

[0016] Step 1, the spiral blade is arranged outside the inner drum body, and the first through hole on the connecting lug of the spiral blade is aligned with the second through hole on the inner drum body;

[0017] Step 2, the fastener sequentially penetrates the first through hole and the second through hole from outside to inside, and is pre-fastened on the inner cavity side of the inner drum body, so as to preliminarily fix the spiral blade on the inner drum body;

[0018] Step 3, steps 1 and 2 are repeated to complete the installation and pre-fastening of all spiral blades;

[0019] Step 4, all spiral blades are finally fastened, and adjacent spiral blades are welded into one body by resistance welding.

[0020] Further, in step 2, the fastener is a bolt and a nut, and when pre-fastening, the nut is sleeved on and tightened on the threaded end of the bolt in the inner cavity of the inner drum body (2).

[0021] Further, in step 1, the spiral blade is radially positioned by being embedded in the spiral groove processed on the outer surface of the inner drum body.

[0022] Further, after step 4, there is also an inspection step: using a go gauge to check whether the channel formed between adjacent spiral blades is qualified, and polishing the welding point.

[0023] The advantages of the present application are:

[0024] 1、The present application fundamentally discards the traditional plug-in mode relying on the thick-walled groove of the inner drum body by spirally arranging L-shaped spiral pieces on the outer surface of the inner drum body and connecting the spiral pieces with the fasteners penetrating radially through the connecting lugs vertically extending from the inner diameter edge of the spiral piece body, so that the inner drum body can adopt a thinner cylinder wall structure, effectively realizing the lightweight of the overall structure. At the same time, the cooperation of multiple connecting lugs and fasteners provides multiple direct and reliable mechanical fixing points for each spiral piece, greatly enhancing the connection stiffness between the spiral pieces and the inner drum body and the stability of the overall structure, successfully solving the technical problems of insufficient connection stiffness and poor stability caused by the increase in diameter and the decrease in spiral piece profile angle.

[0025] 2、The assembly method of the present application first ensures that all the spiral pieces have very high initial position accuracy before welding through pre-tightening, effectively avoiding error accumulation; the subsequent welding mainly plays an auxiliary role in enhancing the overall strength, which scientifically decomposes the assembly stress, so that the mechanical fastening and welding complement each other, and together ensure the long-term stability of the structure. BRIEF DESCRIPTION OF DRAWINGS

[0026] The above and / or other features and advantages of the present application will become more apparent by describing in following reference to the accompanying drawings, which are not drawn to scale, and some features are enlarged or reduced to show the details of certain components, in which:

[0027] Figure 1 The structural schematic diagram of the large-diameter inner drum spiral body structure provided by the present application;

[0028] Figure 2 The structural schematic diagram of the spiral piece in the present application, wherein (a) is a front view of the spiral piece, (b) is a cross-sectional view of the spiral piece taken along line A-A in (a), and (c) is a top view of the spiral piece;

[0029] Figure 3 The structural schematic diagram of the inner drum body in the present application;

[0030] Figure 4 The installation structural schematic diagram of the spiral piece and the inner drum body connected by the bolt and nut in the present application;

[0031] Figure 5 The resistance welding spot distribution schematic diagram of the spiral piece in the present application.

[0032] In the figure: 1-spiral piece, 11-spiral piece body, 12-connecting lug, 13-first through hole; 2-inner drum body, 21-second through hole; 3-nut; 4-bolt; 5-welding spot. DETAILED DESCRIPTION

[0033] The present application will be described in detail below with reference to the accompanying drawings by means of exemplary embodiments of the present application. It is to be noted that the following detailed description of the present application is merely intended for illustrative purposes and is not intended to limit the present application.

[0034] It is to be noted that, in the context of the present application, the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "inner", "outer", "clockwise" and "counterclockwise" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which are merely for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0035] In addition, terms such as "first" and "second" are merely for descriptive purposes and cannot be understood as indicating or implying relative importance or implying the number of technical features indicated. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features.

[0036] The inner drum spiral structure provided by the present application is particularly suitable for a spiral cartridge drum feeding system matched with a certain type of small caliber automatic artillery. The system realizes the orderly feeding and feeding of the to-be-fed load through a spiral channel.

[0037] Referring to Figure 1 , the large-diameter inner drum spiral structure as an exemplary embodiment of the present application comprises an inner drum body 2, a plurality of spiral pieces 1 and a plurality of fasteners. The plurality of spiral pieces 1 are arranged spirally around the outer surface of the inner drum body 2 and can collectively constitute at least one continuous spiral channel.

[0038] As shown in Figure 2 , the cross section of the spiral piece 1 is L-shaped and comprises a spiral piece body 11 and a connecting lug 12. The spiral piece body 11 is the main part forming the guide surface. The connecting lug 12 is a plurality of connecting lugs arranged at the inner diameter edge of the spiral piece body 11, especially arranged at equal intervals, and extends perpendicularly from the edge. The spiral piece body 11 and the connecting lug 12 are preferably integrally formed, but can also be formed separately and connected.

[0039] When the spiral piece 1 is mounted to the inner drum body 2, the connecting lug 12 can be attached to the cylinder wall of the inner drum body 2. This design can ensure direct and uniform transmission of the connecting force, avoid adverse stress concentration, and thus improve the durability of the structure. However, this is not a limitation of the present application, and an intermediate element such as a gasket can be provided between the connecting lug 12 and the inner drum body 2.

[0040] A first through hole 13 is formed on each connecting lug 12 for connecting a fastener to achieve the connection between the spiral blade 1 and the inner drum body 2.

[0041] With reference to Figure 3 , the inner drum body 2 is a cylindrical structure with both ends open, and a plurality of groups of second through holes 21 are radially formed on the cylindrical wall along the designed spiral track for connecting fasteners to achieve the connection between the spiral blade 1 and the inner drum body 2. In some embodiments of the present application, a spiral groove is provided on the outer surface of the inner drum body 2, which plays a key role in the radial positioning of the spiral blade 1 during assembly. This design provides accurate installation reference for each spiral blade, ensuring that all spiral blades can be quickly and accurately positioned on the designed spiral track, thereby significantly improving assembly accuracy and efficiency. During subsequent fastening and welding operations, the physical constraint of the spiral groove achieves reliable pre-positioning of the spiral blade, and in combination with the fastening of the fastener, it forms a powerful constraint system. This system not only effectively resists deformation caused by thermal stress during welding to ensure the dimensional stability of the structure after welding, but also evenly distributes the load to the inner drum body through the support of the groove on the root of the spiral blade, avoiding excessive stress concentration at the bolt connection point, thereby helping to improve the overall fatigue life and long-term operation reliability of the structure.

[0042] In combination Figure 4 , the fastener in the present application preferably uses standard bolts 4 and nuts 3. During assembly, the bolt 4 passes through the first through hole 13 on the connecting lug 12 of the spiral blade and the second through hole 21 on the cylindrical wall of the inner drum body 2 from the outside to the inside, then extends into the inner cavity of the inner drum body 2, and finally is tightened and locked with the nut 3. This connection method not only has high clamping force and high reliability, but also has good processability for tightening from the inner cavity side. However, those skilled in the art will understand that the fastener is not limited to a bolt and nut combination, and the core is to achieve a mechanical connection that can penetrate the connecting lug 12 and the inner drum body 2 and be locked. For example, the fastener can also be a rivet or a combination of a quick-release pin shaft with an enlarged head at one end and a snap ring.

[0043] The present application realizes a brand-new connection mode through the L-shaped cross-section design of the spiral piece 1, the alignment and cooperation of the connecting lug 12 with the first through hole 13 and the second through hole 21 on the inner drum body 2, and the penetration connection by using the fastener. The structure principle discards the traditional plug-in mode which must process a deep groove on the thick-walled cylinder, and the direct effect is that the inner drum body 2 can adopt a thinner cylinder wall, thereby significantly reducing the overall weight and realizing light weight. At the same time, the fixation by the multiple independent connecting lugs 12 provides sufficient and reliable mechanical constraint for each spiral piece 1, thereby greatly enhancing the connection stiffness and the stability of the overall structure, and fundamentally solving the problems of unstable connection and decreased shape and position accuracy caused by the increase of the inner drum diameter and the change of the spiral piece size.

[0044] The assembly method for assembling the large-diameter inner drum spiral structure according to the exemplary embodiment of the present application includes the following steps:

[0045] First, mechanical pre-fastening is performed: the spiral piece 1 is placed outside the inner drum body 2, the spiral groove on the outer surface of the inner drum body 2 is used for preliminary radial positioning, the connecting lug 12 is ensured to be well fitted with the outer surface of the cylinder wall, and the first through hole 13 on the spiral piece 1 is accurately aligned with the second through hole 21 on the inner drum body 2. Then, the bolt 4 is sequentially penetrated from the outside to the inside through the first through hole 13 and the second through hole 21, the nut 3 is sleeved and tightened on the threaded end of the bolt 4 in the inner cavity of the inner drum body 2, and thus the pre-fastening of the single spiral piece 1 is completed. The operation is repeated in this order until the installation and pre-fastening of all spiral pieces 1 are completed. This "mechanical pre-fastening" process ensures that all spiral pieces have reached a very high position accuracy and perpendicularity before final welding, thereby laying a reliable foundation for subsequent processes.

[0046] Then, welding is performed to enhance the integrity: after the final mechanical fastening of all spiral pieces 1 is completed, resistance welding is performed at the abutment of adjacent spiral pieces 1, so that the multiple spiral pieces on the same spiral line track are integrated. As shown in Figure 5 , a typical distribution position of the welding points 5 subjected to resistance welding at the abutment of adjacent spiral pieces 1 is shown. This welding step further enhances the integrity and rigidity of the spiral structure.

[0047] Finally, inspection and necessary trimming are performed: whether the spiral channel formed between adjacent spiral pieces 1 is qualified is checked by using a spring gauge or other suitable gauge, and it is ensured that the channel is smooth and free of any jamming. The resistance-welded welding points 5 are allowed to be appropriately polished to make the surface smooth, so as to ensure the smoothness of the material running in the channel.

[0048] The assembly method realizes multiple positive effects through the process of "mechanical pre-tightening first and then welding reinforcement". First, the accurate positioning of the spiral groove and the one-by-one pre-tightening of the bolt ensure that all spiral pieces have obtained very high initial position accuracy and perpendicularity before welding, effectively avoiding error accumulation and laying a reliable foundation for forming qualified spiral channels. Second, this order scientifically decomposes the assembly stress: mechanical fastening bears the main structural load, and the subsequent resistance welding mainly plays an auxiliary role in enhancing the integrity and sealing of the whole, and the two cooperate to ensure the high stiffness and high stability of the connection structure in long-term use. In addition, the gauge inspection as the final quality control means directly verifies the functionality of the spiral channel and ensures the final use performance of the product. The whole process of the method is logical, and it is especially suitable for high-precision, high-efficiency and high-reliability assembly in large-diameter and multi-spiral piece scenarios.

[0049] In summary, the present application realizes the optimization and innovation of the large-diameter inner drum spiral structure in "product structure" and "assembly process" while ensuring the structural strength and functional reliability.

[0050] Finally, it should be noted that the features mentioned and / or shown in the above description of the exemplary embodiments of the present application can be combined in the same or similar manner into one or more other embodiments, combined with or replace the corresponding features in other embodiments. The technical solutions obtained by combining or replacing should also be considered to be included in the protection scope of the present application.

Claims

1. A large diameter internal drum spiral body structure, characterized by: The inner drum body (2), a plurality of spiral pieces (1) and a plurality of fasteners are included. The plurality of spiral pieces (1) spirally wrap along the outer surface of the inner drum body (2). The cross section of the spiral piece (1) is L-shaped, including a spiral piece body (11) for forming a guide surface and a plurality of connecting lugs (12) vertically extending from the inner diameter edge of the spiral piece body, and a first through hole (13) is formed on the connecting lug (12). A second through hole (21) corresponding to the first through hole (13) is radially formed on the cylinder wall of the inner drum body (2). The fastener sequentially penetrates the first through hole (13) on the connecting lug (12) and the second through hole (21) on the inner drum body (2), and is fastened on the inner cavity side of the inner drum body (2), so as to fixedly connect the spiral piece (1) and the inner drum body (2).

2. The large diameter interior drum spiral structure of claim 1, wherein: The fastener is a bolt (4) and a nut (3), the bolt (4) sequentially penetrates the first through hole (13) and the second through hole (21) from outside to inside, and extends into the inner cavity of the inner drum body (2), and is locked by the nut (3).

3. Large diameter inner drum spiral structure according to claim 1 or 2, characterized in that: A spiral groove is arranged on the outer surface of the inner drum body (2) for radially positioning the spiral piece (1).

4. The large diameter interior drum spiral structure of claim 1 or 2, wherein: The connecting lug (12) is attached to the outer surface of the cylinder wall of the inner drum body (2).

5. An assembly method for assembling the large diameter inner drum spiral structure according to any one of claims 1 to 4, characterized by, The steps include: Step 1, the spiral piece (1) is arranged outside the inner drum body (2), and the first through hole (13) on the connecting lug (12) of the spiral piece (1) is aligned with the second through hole (21) on the inner drum body (2); Step 2, the fastener sequentially penetrates the first through hole (13) and the second through hole (21) from outside to inside, and is pre-fastened on the inner cavity side of the inner drum body (2), so that the spiral piece (1) is preliminarily fixed on the inner drum body (2); Step 3, steps 1 and 2 are repeated to complete the installation and pre-fastening of all spiral pieces (1); Step 4, all spiral pieces (1) are finally fastened, and adjacent spiral pieces (1) are integrally welded by resistance welding.

6. The method of assembly of claim 5, wherein: In step 2, the fastener is a bolt (4) and a nut (3), and when pre-fastening, the nut (3) is sleeved and tightened on the threaded end of the bolt (4) in the inner cavity of the inner drum body (2).

7. The method of assembling according to claim 5 or 6, wherein: In step 1, the spiral piece (1) is radially positioned by being embedded in the spiral groove processed on the outer surface of the inner drum body (2).

8. The method of assembling according to claim 5 or 6, wherein, After step 4, there is also an inspection step: using a go gauge to check whether the channel formed between adjacent spiral pieces (1) is qualified, and polishing the welding point.

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