A shear-resistant fatigue-resistant connecting rod structure

Abstract

The utility model relates to a kind of anti-fatigue connecting rod structure of shearing resistance, belong to water turbine technical field.Solve the problems of connecting rod stress concentration, fatigue crack, shearing failure in prior art.Technical points: operating frame is sleeved on the both sides of piston assembly, ear handle is sleeved on left operating frame, the bottom of two connecting rods is clamped ear handle by the connecting rod pin of bottom, the top of two connecting rods is clamped rotating arm by the connecting rod pin of top, connecting rod and connecting rod pin gap cooperation, blade is installed on rotating arm;Two ends of connecting rod are semicircular, both ends are provided with pin hole, 4 round holes are arranged on the inner wall of pin hole, pin shaft is inserted into round hole.The utility model cancels pin hole screw, uses pin shaft instead, can effectively avoid the fracture damage of pin hole screw due to high shearing stress;Pin shaft is used to optimize load distribution, reduce local stress concentration, improve the anti-shearing capacity of connecting rod, applicable to high impact, heavy load working condition;The arrangement direction of pin shaft is optimized, and the fatigue strength of connecting rod is enhanced.

Description

Technical Field

[0001] This utility model relates to the field of water turbine technology, specifically to a shear-resistant and fatigue-resistant connecting rod structure. Background Technology

[0002] In the transmission system of hydropower turbine units, the connecting rod is a key component, and its performance directly affects the normal operation of the entire unit. In recent years, with the continuous changes in my country's energy structure, the function of large and medium-sized axial-flow propeller units has gradually shifted from a single power generation mode to a peak-shaving and frequency regulation mode. This functional shift has led to a significant increase in the operating frequency of the units, placing higher demands on the reliability and durability of the connecting rods in the transmission system.

[0003] However, existing traditional connecting rod structures have many limitations. The cross-sectional dimensions of pins and screws are usually small. Under high-frequency and high-load transmission conditions, the contact surface of the pin hole is prone to shear deformation or fracture due to stress concentration. When the turbine unit is running, there are vibration, impact and alternating loads. The gap of the pin hole fit may gradually increase due to wear, resulting in loose connection and affecting transmission accuracy.

[0004] Therefore, there is an urgent need to propose a shear-resistant and fatigue-resistant connecting rod structure to solve the problems of stress concentration, fatigue cracks, and shear failure in existing connecting rod technologies. Utility Model Content

[0005] In view of the above facts, in order to solve the problems of stress concentration, fatigue cracks and shear failure in the connecting rod in the prior art, this utility model designs a shear-resistant and fatigue-resistant connecting rod structure.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A shear-resistant and fatigue-resistant connecting rod structure includes a piston assembly, an operating frame, a lug, a connecting rod, a connecting rod pin, a pivot arm, and a blade.

[0008] The operating frame is mounted on both sides of the piston assembly, the lug is mounted on the left operating frame, the bottom of the two connecting rods is clamped to the lug by the bottom connecting rod pin, and the top of the two connecting rods is clamped to the rotating arm by the top connecting rod pin. The connecting rod and the connecting rod pin are clearance-fitted, and the blade is mounted on the rotating arm.

[0009] The connecting rod has semi-circular ends, and each end is provided with a pin hole with a diameter of 170mm. The inner wall of the pin hole is provided with 4 round holes, and the pin is inserted into the round holes.

[0010] Furthermore: the circular holes are symmetrically arranged;

[0011] Draw a center line with the pin hole as the center, and draw a straight line through the centers of the two opposite circular holes. The angle between the center line and the straight line is 22.5°.

[0012] Furthermore: the depth of the pin hole is 65mm.

[0013] Furthermore, a through hole is provided in the middle of the connecting rod.

[0014] The beneficial effects of this utility model are as follows:

[0015] 1. This utility model eliminates the pin hole screw and replaces it with a pin shaft, which can effectively avoid the breakage of the pin hole screw due to high shear stress.

[0016] 2. This utility model uses a pin shaft to optimize load distribution, reduce local stress concentration, and improve the shear resistance of the connecting rod, making it suitable for high-impact and heavy-load conditions.

[0017] 3. This utility model optimizes the arrangement of the pin shaft, enhances the fatigue strength of the connecting rod, avoids fatigue damage caused by frequent operation, thereby significantly improving the fatigue life of the connecting rod and ensuring the long-term stable operation of the unit.

[0018] 4. The pin selected in this utility model can achieve high-precision positioning, ensure the accuracy of the connecting rod connection, and is easy to install without the need for screwing or other operations, thereby improving assembly efficiency and facilitating equipment maintenance, repair and parts replacement. Attached Figure Description

[0019] Figure 1 This is a cross-sectional view of the present invention;

[0020] Figure 2 This is the left view of the present invention;

[0021] Figure 3 This is a schematic diagram of the connecting rod in this utility model.

[0022] In the diagram: 1-piston assembly, 2-operating bracket, 3-ear handle, 4-connecting rod, 5-connecting rod pin, 6-rotor arm, 7-blade, 8-pin hole, 9-round hole, 10-through hole. Detailed Implementation

[0023] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0024] The terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0025] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0026] The preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0027] Example: A shear-resistant and fatigue-resistant connecting rod structure according to this example includes a piston assembly 1, an operating frame 2, a lug 3, a connecting rod 4, a connecting rod pin 5, a rotating arm 6, and a blade 7;

[0028] The operating frame 2 is mounted on both sides of the piston assembly 1, the lug 3 is mounted on the left operating frame 2, the bottom of the two connecting rods 4 is clamped by the bottom connecting rod pin 5, and the top of the two connecting rods 4 is clamped by the top connecting rod pin 5. The connecting rods 4 and the connecting rod pin 5 are in clearance fit, and the blade 7 is mounted on the rotating arm 6.

[0029] The two ends of the connecting rod 4 are semi-circular, and each end is provided with a pin hole 8 with a diameter of 170mm. The inner wall of the pin hole 8 is provided with 4 round holes 9, and the pin is inserted into the round holes 9.

[0030] More specifically: the circular holes 9 are symmetrically arranged;

[0031] Draw a center line with the pin hole 8 as the center, and draw a straight line through the centers of the two opposite circular holes 9. The angle between the center line and the straight line is 22.5°.

[0032] More specifically: the pin hole 8 is 65mm deep.

[0033] More specifically: a through hole 10 is provided in the middle of the connecting rod 4.

[0034] More specifically: During normal operation, the hydraulic control drives the piston assembly 1 to move up and down, which in turn moves the operating frame 2 up and down. When the operating frame 2 moves upward, it drives the lug 3 to move upward, which in turn moves the connecting rod 4 upward. The top of the connecting rod 4 causes the rotating arm 6 to rotate, thereby opening the blade 7.

[0035] When the operating frame 2 moves downward, it drives the lug 3 downward, which in turn drives the connecting rod 4 downward. The top of the other end of the connecting rod 4 causes the rotating arm 6 to rotate, thereby closing the blade 7.

[0036] 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 the utility model has been described in detail with reference to the foregoing embodiments, modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; as long as there is no structural conflict, the features in the specific embodiments disclosed in this application can be combined with each other in any way, and will not cause the substance of the corresponding technical solutions to deviate from the scope of the technical solutions of this utility model.

[0037] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A shear-resistant and fatigue-resistant connecting rod structure, characterized in that, Includes piston assembly (1), operating frame (2), lug (3), connecting rod (4), connecting rod pin (5), swing arm (6), and blade (7); The operating frame (2) is fitted on both sides of the piston assembly (1), the lug (3) is fitted on the left operating frame (2), the bottom of the two connecting rods (4) is clamped by the bottom connecting rod pin (5), the top of the two connecting rods (4) is clamped by the top connecting rod pin (5), the connecting rod (4) and the connecting rod pin (5) are clearance fit, and the blade (7) is installed on the rotating arm (6); The two ends of the connecting rod (4) are semi-circular, and each end is provided with a pin hole (8) with a diameter of 170mm. The inner wall of the pin hole (8) is provided with 4 round holes (9), and the pin is inserted into the round holes (9).

2. The shear-resistant and fatigue-resistant connecting rod structure according to claim 1, characterized in that, The circular holes (9) are arranged symmetrically; Draw a center line with the pin hole (8) as the center, and draw a straight line through the center of the two opposite circular holes (9). The angle between the center line and the straight line is 22.5°.

3. The shear-resistant and fatigue-resistant connecting rod structure according to claim 1, characterized in that, The pin hole (8) is 65 mm deep.

4. The shear-resistant and fatigue-resistant connecting rod structure according to claim 1, characterized in that, The connecting rod (4) has a through hole (10) in the middle.

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