Crankshaft with adjustable eccentricity

Abstract

The utility model relates to a crankshaft with adjustable eccentricity, which comprises a concentric shaft (1), a first eccentric shaft (2), a second eccentric shaft (3), a first eccentric block (4) and a second eccentric block (5), one end of the concentric shaft (1) is fixedly provided with the first eccentric block (4), the other end of the concentric shaft (1) is fixedly provided with the second eccentric block (5), and the eccentric directions of the first eccentric block (4) and the second eccentric block (5) are opposite. The crankshaft assembly has the advantages that by adjusting the phase angles of the first eccentric shaft and the second eccentric shaft, the overall eccentricity of the crankshaft can be continuously adjusted within the range of 0-2a, the vibration parameter requirements of products with different sizes or weights are met, the crankshaft assembly does not need to be replaced, and the equipment adaptability is remarkably improved.

Description

Crankshaft with adjustable eccentricity Technical Field

[0001] This utility model relates to a crankshaft with adjustable eccentricity, belonging to the field of crankshafts. Background Technology

[0002] As a core component of the alignment machine, the crankshaft converts the rotational motion of the motor into the vibration force of the vibration mechanism, directly affecting the amplitude and vibration effect of the equipment. Currently, most alignment machines on the market use a crankshaft design with a fixed eccentricity, meaning the crankshaft's eccentricity is fixed during machining or assembly and cannot be adjusted later via software or hardware. In practical applications, if it is necessary to change the vibration force to adapt to the production needs of different products, traditional solutions can only achieve this through the following two methods:

[0003] 1. Adjusting motor speed: By changing the motor's input frequency or voltage, the speed can be adjusted, indirectly affecting the output of vibration force. However, this method is limited by the motor's physical properties, with a limited adjustment range, and may lead to accelerated equipment wear or unstable operation due to excessively high speed.

[0004] 2. Crankshaft assembly replacement: The original crankshaft needs to be disassembled and a new crankshaft with a specific eccentricity needs to be reinstalled. The operation is cumbersome and time-consuming, which increases the downtime of the production line. At the same time, the additional purchase of crankshafts of different specifications also increases the equipment maintenance cost.

[0005] As the manufacturing industry moves towards smaller batches and more diverse products, the need for frequent changes in product specifications during production is increasing, highlighting the limitations of traditional fixed-eccentricity crankshafts. Current technology lacks a solution that allows direct adjustment of the eccentricity after crankshaft installation, resulting in insufficient equipment adaptability, low production efficiency, and resource waste due to long-term reliance on replacing crankshaft assemblies. Summary of the Invention

[0006] To address the aforementioned problems, this invention proposes an adjustable crankshaft with adjustable eccentricity. Through mechanical structural adjustments, the eccentricity is continuously controllable, overcoming the limitation of fixed eccentricity in traditional crankshafts. This design allows for flexible adjustment of vibration force according to product requirements even after installation, without the need to replace the crankshaft assembly or rely excessively on motor speed adjustments. This significantly improves the equipment's versatility, maintenance efficiency, and production cost control, filling a gap in existing technology.

[0007] This utility model provides a crankshaft with adjustable eccentricity. The technical solution of this utility model is as follows:

[0008] An adjustable eccentric crankshaft includes a concentric shaft (1), a first eccentric shaft (2), a second eccentric shaft (3), a first eccentric block (4), and a second eccentric block (5). The first eccentric block (4) is fixedly mounted at one end of the concentric shaft (1), and the second eccentric block (5) is fixedly mounted at the other end. The eccentric directions of the first eccentric block (4) and the second eccentric block (5) are opposite. The first eccentric shaft (2) is fitted between the concentric shaft (1) and the first eccentric block (4), and its eccentricity relative to the axis of the concentric shaft (1) is [missing information]. The distance between the first eccentric shaft (2) and the second eccentric block (5) is a. The second eccentric shaft (3) is fitted between the concentric shaft (1) and the second eccentric block (5), and is further eccentric with the first eccentric shaft (2) as the reference. The eccentric distance between the axis of the second eccentric shaft (3) and the axis of the first eccentric shaft (2) is a. An eccentric space is formed between the concentric shaft (1) and the first eccentric block (4), and between the concentric shaft (1) and the second eccentric block (5). By adjusting the eccentric direction angle between the first eccentric shaft (2) and the second eccentric shaft (3), the crankshaft eccentricity can be continuously changed.

[0009] The eccentricity adjustment range of the first eccentric shaft (2) and the second eccentric shaft (3) is 0 to 2a. When the eccentricity directions of the first eccentric shaft (2) and the second eccentric shaft (3) are consistent, the overall eccentricity is the maximum value of 2a; when the eccentricity directions of the two are opposite, the overall eccentricity is the minimum value of 0.

[0010] Several eccentric block tension bolt holes are provided on the first eccentric block (4) and the second eccentric block (5). The first eccentric shaft (2) or the second eccentric shaft (3) is positioned by the cooperation of the tension bolts with the eccentric block tension bolt holes at different positions.

[0011] The advantages of this utility model are:

[0012] 1. Continuously adjustable eccentricity to meet diverse production needs: By adjusting the phase angle between the first and second eccentric shafts, the overall eccentricity of the crankshaft can be continuously adjusted within the range of 0 to 2a, meeting the vibration parameter requirements of products of different sizes or weights. There is no need to replace the crankshaft assembly, which significantly improves the adaptability of the equipment.

[0013] 2. Simple structure and convenient operation: The design of tension bolt hole and eccentric block is adopted. The eccentricity setting can be completed by simply loosening the bolt, adjusting the eccentric angle and then tightening it again. The operation process is simple and fast, which greatly reduces the debugging time and labor costs.

[0014] 3. Improved operational stability and reliability: The symmetrical design of the opposing eccentric blocks and the anti-loosening structure of the tensioning bolts effectively counteracts centrifugal force and prevents component displacement caused by vibration, ensuring smooth operation after the eccentricity is locked and extending the service life of the equipment.

[0015] This invention solves the core problems of fixed crankshaft eccentricity and inconvenient adjustment in traditional crankshafts, and combines high compatibility, ease of operation and economy, providing efficient and reliable technical support for multi-variety, small-batch production modes. Attached Figure Description

[0016] Figure 1 is a schematic diagram of the main structure of this utility model.

[0017] Figure 2 is a side view of Figure 1.

[0018] Figure 3 is a top view of Figure 1.

[0019] Figure 4 is a perspective view of this utility model. Detailed Implementation

[0020] The present invention will be further described below with reference to specific embodiments, and the advantages and features of the present invention will become clearer as a result of the description. However, these embodiments are merely exemplary and do not constitute any limitation on the scope of the present invention. Those skilled in the art should understand that modifications or substitutions can be made to the details and form of the technical solution of the present invention without departing from the spirit and scope of the present invention, but all such modifications and substitutions fall within the protection scope of the present invention.

[0021] Referring to Figures 1 to 4, this utility model relates to a crankshaft with adjustable eccentricity, including a concentric shaft 1, a first eccentric shaft 2, a second eccentric shaft 3, a first eccentric block 4, and a second eccentric block 5. The first eccentric block 4 is fixedly installed at one end of the concentric shaft 1, and the second eccentric block 5 is fixedly installed at the other end. The eccentric directions of the first eccentric block 4 and the second eccentric block 5 are opposite. The first eccentric shaft 2 is fitted between the concentric shaft 1 and the first eccentric block 4, and its eccentricity distance from the axis of the concentric shaft 1 is 'a'. The second eccentric shaft 3 is fitted between the concentric shaft 1 and the second eccentric block 5, further eccentrically positioned relative to the first eccentric shaft 2. The eccentricity distance between the axis of the second eccentric shaft 3 and the axis of the first eccentric shaft 2 is 'a'. An eccentric space is formed between the concentric shaft 1 and the first eccentric block 4, and between the concentric shaft 1 and the second eccentric block 5. By adjusting the angle between the eccentric directions of the first eccentric shaft 2 and the second eccentric shaft 3, continuous variation of the crankshaft eccentricity can be achieved.

[0022] Based on the above component configuration, the following advantages are achieved:

[0023] 1. The eccentricity is continuously adjustable to meet diverse production needs.

[0024] By adjusting the angle between the eccentric directions of the first eccentric shaft 2 and the second eccentric shaft 3 (from 0° to 180°), the overall eccentricity of the crankshaft can be continuously varied within the range of 0 to 2a. When the eccentric directions of the two eccentric shafts are consistent, the eccentricity is superimposed to the maximum value of 2a, which is suitable for large amplitude requirements; when the directions are opposite, they cancel each other out to the minimum value of 0, which meets the needs of small amplitude scenarios. This design breaks through the limitation of the fixed eccentricity of traditional crankshafts, and can adapt to the vibration parameter requirements of different products without changing the assembly, significantly improving the flexibility of the equipment.

[0025] 2. The symmetrical structure and tension bolt hole design ensure stability and ease of operation.

[0026] The first eccentric block 4 and the second eccentric block 5 are arranged in a symmetrical layout with opposite eccentric directions, which effectively counteracts the rotational centrifugal force and reduces vibration and off-center load. At the same time, the tension bolt holes on the eccentric blocks can achieve rapid positioning and locking of the eccentric shaft by matching the bolts with different hole positions. The operation is simple and the anti-loosening is reliable, avoiding the cumbersome process of frequent disassembly in traditional solutions.

[0027] The eccentricity adjustment range of the first eccentric shaft 2 and the second eccentric shaft 3 is 0 to 2a. When the eccentricity directions of the first eccentric shaft 2 and the second eccentric shaft 3 are the same, the overall eccentricity is the maximum value of 2a; when the eccentricity directions of the two are opposite, the overall eccentricity is the minimum value of 0.

[0028] The first eccentric shaft 2 and the second eccentric shaft 3 are arranged in a symmetrical, opposing direction. The centrifugal forces generated by them cancel each other out during rotation, reducing vibration and uneven bearing stress caused by eccentric loads on the crankshaft. This improves the stability of equipment operation and extends the service life of key components. Adjusting the eccentricity only requires rotating the eccentric shaft to change its phase angle, and then quickly locking the target position using the tension bolt holes and positioning marks, without the need for complex tools or disassembly of the crankshaft assembly. This design significantly simplifies the commissioning process, reduces downtime, and is especially suitable for production lines that frequently switch product specifications, significantly improving efficiency and reducing labor maintenance costs.

[0029] Several eccentric block tension bolt holes are provided on the first eccentric block 4 and the second eccentric block 5. The first eccentric shaft 2 or the second eccentric shaft 3 is positioned by the cooperation of the tension bolts with the eccentric block tension bolt holes at different positions.

[0030] The first eccentric block 4 and the second eccentric block 5 have several tension bolt holes 6, forming a multi-level positioning point. By selecting different hole positions and cooperating with the tension bolts, the phase angle of the first eccentric shaft and the second eccentric shaft can be precisely controlled (such as each hole corresponding to a fixed angle interval), so as to realize the step-like or continuous fine adjustment of the eccentricity and ensure the accurate matching of vibration parameters.

[0031] The tension bolt hole design allows for phase adjustment or disassembly of the eccentric shaft simply by tightening or loosening the bolts, without the need for special tools or complex operations. This structure significantly simplifies the eccentricity adjustment process, making it particularly suitable for production sites that require rapid product specification changes, and significantly improving equipment response speed and production efficiency.

[0032] The tension bolt hole structure, through multi-level positioning, anti-loosening reinforcement and modular design, achieves high-precision adjustment of eccentricity while taking into account ease of operation, operational stability and maintenance economy, solving the technical pain points of traditional crankshaft adjustment difficulties and reliance on replacing the entire assembly.

[0033] The working principle of this invention is based on the superposition effect of two eccentric axes and symmetrical mechanical design, achieving continuous and controllable eccentricity through mechanical structure adjustment. The specific workflow is as follows:

[0034] 1. Structural composition and initial state

[0035] Concentric shaft 1: As the core rotating shaft of the crankshaft, the first eccentric block 4 and the second eccentric block 5 are fixedly installed at both ends.

[0036] Eccentric shaft and eccentric block:

[0037] The first eccentric shaft 2 is fitted between the concentric shaft 1 and the first eccentric block 4, and the eccentric distance between its axis and the axis of the concentric shaft 1 is a;

[0038] The second eccentric shaft 3 is fitted between the concentric shaft 1 and the second eccentric block 5, and is further eccentric by a distance a based on the first eccentric shaft 2, so that the total eccentricity with the concentric shaft 1 is 2a; the eccentric directions of the first eccentric block 4 and the second eccentric block 5 are initially set to be opposite, forming a symmetrical layout.

[0039] 2. Eccentricity Adjustment Mechanism

[0040] Phase angle adjustment:

[0041] Loosen the tensioning bolts on the first eccentric block 4 and the second eccentric block 5 to allow the first eccentric shaft and the second eccentric shaft to rotate freely around the concentric shaft 1;

[0042] By rotating the first eccentric shaft 2 or the second eccentric shaft 3, the angle (phase angle) between their eccentric directions can be changed.

[0043] Maximum eccentricity (2a): When the eccentricity directions of the two eccentric axes are the same (phase angle 0°), the eccentricity is superimposed, and the total eccentricity is 2a, which is suitable for large amplitude scenarios;

[0044] Minimum eccentricity (0): When the eccentric directions of the two eccentric shafts are opposite (phase angle 180°), the eccentricities cancel each other out, and the total eccentricity is 0, which meets the requirements of precision micro-vibration.

[0045] Continuous adjustment: The phase angle can be adjusted arbitrarily between 0° and 180° to achieve stepless change of eccentricity within the range of 0 to 2a.

[0046] Location and Lock:

[0047] The eccentric block has several tension bolt holes that fit with bolts. By selecting different hole positions, the phase angle of the eccentric shaft can be precisely fixed (e.g., each hole corresponds to a 15° interval).

[0048] After tightening the bolts, anti-loosening washers or self-locking nuts ensure that the eccentric block does not shift during high-speed rotation, maintaining the set eccentricity.

[0049] 3. Mechanical balance and stability: Symmetrical cancellation of centrifugal force: The opposing arrangement of the first eccentric block 4 and the second eccentric block 5 makes the centrifugal forces generated by the two eccentric shafts opposite in direction, canceling each other out, reducing crankshaft vibration and off-center load. This design optimizes the bearing force distribution, reduces wear, and improves running stability.

[0050] 4. Application Scenarios and Operational Advantages

[0051] Quickly adapt to production needs: When product specifications need to be changed during production, only the phase angle of the eccentric shaft needs to be adjusted and locked, without replacing the crankshaft assembly or stopping the machine for disassembly, which significantly shortens the debugging time; Intelligent expansion: It can integrate a servo motor to drive the rotation of the eccentric shaft, and combine it with the phase angle feedback of the sensor in real time to realize the automatic dynamic adjustment of the eccentricity, adapting to intelligent production lines.

[0052] This invention achieves continuous and precise adjustment of crankshaft eccentricity through the principle of double eccentric shaft superposition, symmetrical mechanical design, and tension bolt hole positioning technology. It solves the technical bottleneck of traditional crankshaft eccentricity being fixed and adjustment relying on replacing the entire assembly. It has high adaptability, convenient operation, and long service life, providing an efficient solution for flexible manufacturing.

[0053] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A crankshaft with adjustable eccentricity, characterized in that, The system includes a concentric shaft (1), a first eccentric shaft (2), a second eccentric shaft (3), a first eccentric block (4), and a second eccentric block (5). The first eccentric block (4) is fixedly installed at one end of the concentric shaft (1), and the second eccentric block (5) is fixedly installed at the other end. The eccentric directions of the first eccentric block (4) and the second eccentric block (5) are opposite. The first eccentric shaft (2) is fitted between the concentric shaft (1) and the first eccentric block (4), and its eccentricity distance from the axis of the concentric shaft (1) is 'a'. The second eccentric shaft (3) is fitted between the concentric shaft (1) and the second eccentric block (5), and is further eccentric with the first eccentric shaft (2) as a reference. The eccentric distance between the axis of the second eccentric shaft (3) and the axis of the first eccentric shaft (2) is a. An eccentric space is formed between the concentric shaft (1) and the first eccentric block (4), and between the concentric shaft (1) and the second eccentric block (5). By adjusting the eccentric angle between the first eccentric shaft (2) and the second eccentric shaft (3), the crankshaft eccentricity can be continuously changed.

2. The crankshaft with adjustable eccentricity according to claim 1, characterized in that, The eccentricity adjustment range of the first eccentric shaft (2) and the second eccentric shaft (3) is 0 to 2a. When the eccentricity directions of the first eccentric shaft (2) and the second eccentric shaft (3) are consistent, the overall eccentricity is the maximum value of 2a; when the eccentricity directions of the two are opposite, the overall eccentricity is the minimum value of 0.

3. The crankshaft with adjustable eccentricity according to claim 1 or 2, characterized in that, Several eccentric block tension bolt holes are provided on the first eccentric block (4) and the second eccentric block (5). The first eccentric shaft (2) or the second eccentric shaft (3) is positioned by the cooperation of the tension bolts with the eccentric block tension bolt holes at different positions.

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