Segmented locking structure of rotary drum suitable for high dynamic balance precision requirement

Abstract

The utility model relates to centrifuge technical field, and disclose the drum segmentation locking structure suitable for high dynamic balance precision requirement, including drum main part, install the drum upper cover in drum main part, still include the segmentation lock ring for fixing the drum upper cover, dismantle and connect in the drum main part, the segmentation lock ring top and the drum upper cover bottom are opposite, the segmentation lock ring is arc structure, the segmentation lock ring evenly is provided with a plurality, and the self -locking structure is arranged between the drum main part and the segmentation lock ring, the utility model discloses unique segmentation dual -phase steel segmentation lock ring, convenient bolt dismounting interface, optimized flat key positioning and efficient self -locking inclined plane design, not only significantly reduced manufacturing cost, improved production pass rate, more realized high -precision dynamic balance, outstanding dismounting repeatability, convenient maintenance operation and ultrahigh operation reliability and safety, and the overall performance advantage is remarkable.

Description

Technical Field

[0001] This utility model relates to the field of centrifuge technology, specifically to a segmented locking structure for a rotating drum that is suitable for high dynamic balance accuracy requirements. Background Technology

[0002] The centrifuge drum is the core component of a centrifuge, used to contain and separate materials. It is a high-speed rotating cylindrical container that separates mixtures of different densities or phases (such as solid-liquid or liquid-liquid) through the powerful centrifugal force field it generates.

[0003] In conventional centrifuge drum locking structures, threaded connection is the mainstream technical solution, but it has significant drawbacks in practical applications: (1) Low disassembly and assembly efficiency: Large drum assembly requires special hydraulic tools to pre-tighten the threads, maintenance and disassembly are time-consuming and labor-intensive, greatly increasing downtime; (2) Wear and deformation hazards: Repeated disassembly and assembly lead to mechanical wear of the thread pair, coupled with vibration and impact during high-speed operation, which can easily cause plastic deformation of the threads, not only reducing the reliability of the seal, but also increasing the frequency of spare parts replacement and significantly increasing maintenance costs; (3) Deterioration of dynamic balance: The thread fit clearance expands with wear, which leads to the deterioration of the radial positioning accuracy of the drum assembly, which induces strong vibration and noise under ultra-high speed conditions, posing a safety hazard; (4) High processing costs: Rectangular threads require precision turning, resulting in low pass rate and high manufacturing costs.

[0004] To address the aforementioned pain points, there is an urgent need to develop a drum locking structure that combines high assembly and disassembly efficiency, excellent repeatability, and wear resistance to meet the stringent requirements of ultra-high-speed centrifuges for dynamic balance stability and operational safety. Utility Model Content

[0005] This utility model provides a segmented locking structure for a drum suitable for high dynamic balancing accuracy requirements. By disassembling and connecting multiple segmented locking rings on the drum body, high-precision dynamic balancing and excellent disassembly and assembly repeatability are achieved, solving the problems of low disassembly and assembly efficiency and severe wear mentioned in the background art.

[0006] This utility model provides the following technical solution: A segmented locking structure for a rotating drum, suitable for high dynamic balancing accuracy requirements, includes a rotating drum body, a rotating drum cover installed inside the rotating drum body, and segmented locking rings for fixing the rotating drum cover, which are detachably connected inside the rotating drum body. The top of the segmented locking rings abuts against the bottom of the rotating drum cover. The segmented locking rings have an arc-shaped structure, and multiple segmented locking rings are evenly arranged. A self-locking structure is provided between the rotating drum body and the segmented locking rings.

[0007] As a preferred technical solution of this utility model, the self-locking structure includes a self-locking inclined surface fixedly connected inside the drum body, and a locking inclined surface adapted to the self-locking inclined surface is fixedly connected on the segmented locking ring. The two are pressed together by the inclined surfaces to form a friction self-lock.

[0008] As a preferred embodiment of this invention, the inclination angle of the self-locking inclined surface and the locking inclined surface is 10-15°.

[0009] As a preferred technical solution of this utility model, the top of the segmented locking ring is provided with a second keyway, and the bottom of the drum cover is provided with a first keyway. The first keyway and the second keyway are connected by a flat key engagement.

[0010] As a preferred embodiment of this utility model, the clearance between the flat key and the keyway is less than or equal to 0.05 mm.

[0011] As a preferred technical solution of this utility model, a first threaded hole is provided in the drum body, and a second threaded hole is provided on the segmented locking ring. The segmented locking ring is detachably connected to the drum body by bolts.

[0012] As a preferred embodiment of this utility model, the inner diameter of the second threaded hole is larger than the inner diameter of the first threaded hole.

[0013] As a preferred technical solution of this utility model, the segmented locking ring is made of duplex steel.

[0014] Compared with the prior art, this utility model provides a segmented locking structure for a drum suitable for high dynamic balancing accuracy requirements, and has the following beneficial effects: 1. This segmented locking structure is suitable for drums requiring high dynamic balancing precision. By installing the drum cover in the drum body and using bolts to detach and connect the segmented locking ring to the drum body, axial positioning is achieved. When the drum is working, the segmented locking ring restricts the axial displacement of the drum cover. Moreover, the convenient bolt disassembly and assembly interface, optimized flat key positioning, and efficient self-locking inclined surface design not only significantly reduce manufacturing costs but also achieve high-precision dynamic balancing, excellent disassembly and assembly repeatability, convenient maintenance operations, and ultra-high operational reliability and safety, resulting in significant overall performance advantages.

[0015] The parts of this device not covered herein are the same as or can be implemented using existing technologies. The unique segmented dual-phase steel segmented locking ring, convenient bolt disassembly and assembly interface, optimized flat key positioning, and efficient self-locking inclined surface design of this utility model not only significantly reduce manufacturing costs and improve production qualification rate, but also achieve high-precision dynamic balancing, excellent disassembly and assembly repeatability, convenient maintenance operation, and ultra-high operational reliability and safety, with significant overall performance advantages. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, the elements or parts are not necessarily drawn to actual scale.

[0017] Figure 1 This is a three-dimensional schematic diagram of the present invention; Figure 2 This is a plan view of the present invention; Figure 3 This is a schematic diagram of the AA cross-section of this utility model; Figure 4 This is a schematic cross-sectional view of the present invention. Figure 5 This utility model Figure 3 Enlarged diagram of part A in the middle; Figure 6 This utility model Figure 3 Enlarged diagram of section B; Figure 7 This is a three-dimensional schematic diagram of the flat key of this utility model.

[0018] In the figure: 1. Drum body; 101. Self-locking inclined surface; 102. Stepped surface; 103. First threaded hole; 2. Drum top cover; 201. Flat key; 3. Segmented locking ring; 301. Locking inclined surface; 302. Second keyway; 303. Second threaded hole. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Example: Reference Figures 1-7This is a segmented locking structure for drums requiring high dynamic balancing precision. It includes a drum body 1, a drum cover 2 installed inside the drum body 1, and segmented locking rings 3 for fixing the drum cover 2. The segmented locking rings 3 are detachably connected to the drum body 1. The segmented locking rings 3 are made of duplex stainless steel, a high-strength, corrosion-resistant (especially resistant to chloride stress corrosion) advanced stainless steel. A first threaded hole 103 is provided inside the drum body 1, and a second threaded hole 303 is provided on the segmented locking rings 3. The segmented locking rings 3 are detachably connected to the drum body 1 by bolts. Specifically, the bolts are inserted into the second threaded holes 303, extending into the first threaded holes 103 and threadedly connecting to them, thus fixing the segmented locking rings 3 to the drum body 1. Three second threaded holes 303 are evenly distributed circumferentially. Furthermore, the inner diameter of the second threaded holes 303 is larger than the inner diameter of the first threaded holes 103; the first threaded hole 103 is M5, and the second threaded holes 303 are M8. The top of the segmented locking ring 3 abuts against the bottom of the drum cover 2. The segmented locking ring 3 has an arc-shaped structure, and multiple segmented locking rings 3 are evenly distributed, with two to six, preferably four, and are evenly distributed around the circumference. A self-locking structure is provided between the drum body 1 and the segmented locking ring 3. In use, the drum cover 2 is installed in the drum body 1, and the segmented locking ring 3 is detached and connected to the drum body 1 using bolts to achieve axial positioning. When the drum is working, the segmented locking ring 3 restricts the axial displacement of the drum cover 2. Furthermore, the convenient bolt disassembly and assembly interface, optimized flat key 201 positioning, and efficient self-locking inclined surface 101 design not only significantly reduce manufacturing costs and improve production qualification rate, but also achieve high-precision dynamic balancing, excellent disassembly and assembly repeatability, convenient maintenance operations, and extremely high operational reliability and safety, resulting in significant overall performance advantages.

[0021] The self-locking structure includes a self-locking inclined surface 101 fixedly connected within the drum body 1, and a locking inclined surface 301 adapted to the self-locking inclined surface 101 fixedly connected to the segmented locking ring 3. The two are pressed together by the inclined surfaces to form a frictional self-lock. The inclination angle of the self-locking inclined surface 101 and the locking inclined surface 301 is 10-15°, preferably 13°. Under the pressure inside the drum, a frictional self-locking force is generated to prevent loosening, while providing sufficient axial compression to ensure a seal. The segmented locking ring 3 is in close contact with the stepped surface 102 of the drum body 1, directly bearing the axial pressure of the drum cover 2, so that the fixing bolt is only subjected to pure compressive preload and completely avoids shear stress; the axial load forms a closed force flow path through the stepped surface 102 → segmented locking ring 3 → self-locking inclined surface 101 / locking inclined surface 301, and the pressure on the mating surface is axially symmetrically and evenly distributed, completely eliminating local stress concentration.

[0022] The segmented locking ring 3 has a second keyway 302 at its top, and the drum cover 2 has a first keyway at its bottom. The first keyway and the second keyway 302 are connected by a flat key 201. The clearance between the flat key 201 and the keyway is less than or equal to 0.05mm. In use, the clearance between the two is ≤50μm, and radial positioning is achieved through an interference fit. This design can ensure that the radial runout deviation is ≤0.03mm after repeated disassembly and assembly using conventional machining precision, fundamentally solving the problem of deterioration in the dynamic balancing accuracy of high-speed centrifugal machines from a structural perspective.

[0023] The working principle of the segmented locking structure for drums with high dynamic balancing accuracy requirements is as follows: A segmented duplex steel segmented locking ring 3 replaces the traditional threaded pair. During assembly, the flat key 201 of the drum top cover 2 is precisely embedded into the second keyway 302 of the segmented locking ring 3 (fitting clearance ≤ 5μm). After closing the locking ring, a fastening bolt is screwed into the first threaded hole 103 for radial tightening. When the pressure inside the drum increases, the self-locking inclined surface 101 of the drum body 1 and the locking inclined surface 301 of the segmented locking ring 3 are at an angle of 10-15°. The radial clamping force is generated, which converts the axial load into a frictional self-locking force. At the same time, a closed force flow path is formed through the rigid contact between the segmented locking ring 3 and the stepped surface 102. During disassembly, only the bolt needs to be screwed into the second threaded hole 303 of the segmented locking ring 3 to apply a 10 N·m jacking force to achieve non-destructive separation. Throughout the process, the fixing bolt is always in a state of pure compressive stress. Combined with the high hardness of 310HBW of the duplex steel segmented locking ring 3, high dynamic balance accuracy, three times the lifespan, and 50% reduction in maintenance costs are ultimately achieved.

[0024] In addition, cost and efficiency are optimized: replacing the traditional threaded pair with a segmented duplex steel locking ring significantly reduces processing difficulty and manufacturing cost, while the bolt quick-release design shortens maintenance time; dynamic balance accuracy is stable for a long time: the flat key 201 positioning structure (fitting clearance ≤50μm) ensures that it maintains G1 level dynamic balance accuracy after repeated disassembly and assembly, suppressing ultra-high speed vibration from the source; safety and reliability are greatly improved: the 10-15° self-locking inclined plane 101 generates a dual effect under internal pressure, including frictional anti-loosening force and axial sealing pre-tightening force, eliminating the risk of loosening due to high-speed operation vibration; wear-resistant and maintenance-free advantages: the high hardness (HRC≥30) and corrosion resistance of the heat-treated duplex steel locking ring increase the life of key components by more than 3 times, greatly reducing the frequency of spare parts replacement.

[0025] This invention significantly improves the overall performance of the equipment by adopting a segmented dual-phase steel segmented locking ring 3 design, supplemented by an optimized connection and positioning mechanism. Its main functions and advantages are reflected in the following aspects: The drum locking structure, through the positioning design of the flat key 201 and the rigid constraint of the segmented locking ring 3, ensures that it maintains ultra-high circumferential positioning accuracy after repeated disassembly and assembly, completely solves the problem of dynamic balance deterioration caused by wear of traditional threaded pairs, and meets the stringent dynamic balance standards under ultra-high speed conditions.

[0026] The innovative dual-threaded hole system allows for quick installation and removal of the locking ring using conventional bolt tools, significantly shortening the maintenance cycle; Replacing high-cost thread machining with precision-cast segmented locking ring 3 simplifies the structure, significantly reduces manufacturing difficulty, and simultaneously improves production yield and eliminates stress concentration defects.

[0027] The self-locking inclined plane 101 mechanism forms a dual-action mechanism under internal pressure: radial friction self-locking force prevents loosening, axial compression force ensures sealing, and the closed force flow path formed by the stepped surface 102 and the end face of the segmented locking ring 3 achieves inherently safe and reliable operation.

[0028] The segmented structure releases the elastic constraints of the material, allowing the segmented locking ring 3 to be made of high-strength duplex steel, whose excellent corrosion resistance and wear resistance extend the service life of key components many times over.

[0029] Components not described in detail in this article are existing technologies.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A segmented locking structure for a drum with high dynamic balancing accuracy requirements, comprising a drum body (1), wherein a drum cover (2) is installed inside the drum body (1), characterized in that, It also includes a segmented locking ring (3) for securing the drum top cover (2), which is detachably connected within the drum body (1). The top of the segmented locking ring (3) abuts against the bottom of the drum cover (2). The segmented locking ring (3) has an arc-shaped structure. Multiple segmented locking rings (3) are evenly arranged. A self-locking structure is provided between the drum body (1) and the segmented locking ring (3).

2. The segmented locking structure for a drum suitable for high dynamic balancing accuracy requirements according to claim 1, characterized in that, The self-locking structure includes a self-locking inclined surface (101) fixedly connected inside the drum body (1), and a locking inclined surface (301) adapted to the self-locking inclined surface (101) is fixedly connected on the segmented locking ring (3). The two are pressed together by the inclined surfaces to form a friction self-lock.

3. The segmented locking structure for a drum with high dynamic balancing accuracy as described in claim 2, characterized in that, The inclination angle of the self-locking inclined surface (101) and the locking inclined surface (301) is 10-15°.

4. The segmented locking structure for a drum suitable for high dynamic balancing accuracy requirements according to claim 1, characterized in that, The segmented locking ring (3) has a second keyway (302) at the top and a first keyway at the bottom of the drum cover (2). The first keyway and the second keyway (302) are connected by a flat key (201).

5. The segmented locking structure for a drum with high dynamic balancing accuracy as described in claim 4, characterized in that, The clearance between the flat key (201) and the keyway is less than or equal to 0.05 mm.

6. The segmented locking structure for a drum with high dynamic balancing accuracy as described in claim 1, characterized in that, The drum body (1) has a first threaded hole (103) and the segmented locking ring (3) has a second threaded hole (303). The segmented locking ring (3) is detachably connected to the drum body (1) by bolts.

7. The segmented locking structure for a drum with high dynamic balancing accuracy as described in claim 6, characterized in that, The inner diameter of the second threaded hole (303) is larger than the inner diameter of the first threaded hole (103).

8. The segmented locking structure for a drum suitable for high dynamic balancing accuracy requirements according to claim 1, characterized in that, The segmented locking ring (3) is made of duplex steel.

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