Connection method of arc-top flat key

Abstract

The invention discloses a connection method of an arc-top flat key, which relates to the technical field of mechanical transmission connection, and comprises the following steps: S1, fixing a rotating piece, and machining a shaft hole; s2, rotating part clamping is not changed, and an arc-top flat key groove is machined in an opening of a shaft hole in a milling cutter side milling mode at the shaft hole; s3, the rectangular flat key is machined into an arc-top flat key piece, and the bottom of the arc-top flat key piece is an arc angle; s4, a flat key fixing groove in the transmission shaft is machined; s5, the rotating piece and the transmission shaft are connected through an arc-top flat key piece; the bottom of the flat key fixing groove is an arc angle and is matched with the bottom of the arc-top flat key piece. According to the invention, the problem of traditional connection processing is solved, accurate positioning, looseness prevention and stable transmission are realized, and the device is especially suitable for mechanical transmission in a vibration environment.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical transmission connection, in particular to a connection method of an arc top flat key. Background Art

[0002] In the field of mechanical transmission, reliable connection between shaft and shaft hole is of vital importance. The traditional method of connecting shaft hole and shaft with flat key, such as using ordinary flat key connection, has many disadvantages in processing. The processing of keyway in shaft hole often relies on machine tools such as slotting machine or wire cutting, which is not only cumbersome and inefficient, but also costly. Multiple clamping can easily lead to error accumulation, and the cost is greatly increased for small batch production or special-shaped parts with complex structure and difficult clamping. This makes it difficult for traditional connection methods to meet the needs in some occasions with strict requirements on processing cost and precision.

[0003] In practical applications, especially in mechanical transmission under vibration environment, ordinary flat key connection is prone to loosening. The gap between the key and the keyway will gradually increase due to vibration, resulting in radial and axial movement between the shaft and the shaft hole. This not only affects the stability of mechanical transmission, but also may cause equipment failure, shorten the service life of the equipment, and increase maintenance costs. Therefore, a more reliable connection method is urgently needed to solve these problems.

[0004] In view of this, this application is hereby filed. Summary of the invention

[0005] The object of the present invention is to provide a connection method of an arc top flat key to solve the problems mentioned in the above background technology.

[0006] In order to solve the above technical problems, the present invention provides a connection method of an arc-top flat key, comprising the following steps: S1: fixing the rotating part and processing the shaft hole; S2: the rotating part is clamped unchanged, and the arc-top flat key groove is processed at the opening of the shaft hole by using the side milling method of the milling cutter at the shaft hole; S3: processing the rectangular flat key into an arc-top flat key part, and the bottom of the arc-top flat key part is an arc angle; S4: processing the flat key fixing groove on the transmission shaft; S5: the rotating part and the transmission shaft are connected through the arc-top flat key part.

[0007] Furthermore, in S4, the bottom of the flat key fixing groove is an arc angle and is adapted to the bottom of the arc top flat key member, thereby reducing the risk of stress concentration and extending the service life of the device.

[0008] Furthermore, the S2 also includes S21, machining an arc-shaped radial limiting groove 1 in the middle of the top inner wall of the arc-top flat keyway by a milling cutter.

[0009] Furthermore, the S3 also includes S31, processing a storage groove 1 located inside the shaft hole at the top of the arc-top flat key component, processing a storage groove 2 located outside the shaft hole at the top of the arc-top flat key component, and the bottom of the storage groove 1 is connected to the bottom of the storage groove 2 through a horizontally arranged storage groove 3.

[0010] Furthermore, the S3 also includes S32, wherein an arc-shaped limit block is inserted into the top of the storage slot one, and a fixed column one arranged vertically downward is fixed at the inner recess at the bottom center of the arc-shaped limit block, and a vertically arranged connecting block is embedded in and rotatably connected to the bottom of the fixed column one, and a horizontally arranged transverse rod is embedded in and rotatably connected to the bottom of the connecting block, and the other end of the transverse rod passes through the storage slot three and is fixed with a push block, which is slidably connected to the storage slot two in the horizontal direction, and the top of the push block is located above the storage slot two.

[0011] Furthermore, the S3 also includes S33, wherein an axial limit block 2 located in a storage groove 1 is fixed on the top of the transverse rod, an axial limit groove 2 is provided at the top of the transverse rod near the axial limit block 2, an axial limit block 1 fixed to the top of the transverse rod is clamped in the axial limit groove 2, and an axial limit groove 1 adapted to the axial limit block 1 is provided at the top of one end of the storage groove 3 away from the axial limit block 2.

[0012] Furthermore, the bottoms of both ends of the arc-shaped limit block are rectangular structures. When the arc-shaped limit block is naturally extended, the distance between the two ends of its bottom is greater than the distance between the two ends of the bottom opening of the radial limit groove. A notch is provided at the top of the storage groove, and the bottom of the arc-shaped limit block abuts against the two notches respectively.

[0013] Furthermore, when the axial limit block 1 moves into the axial limit groove 1, the axial limit block 2 abuts against the inner wall of the opening at the connection between the storage groove 1 and the storage groove 3. At this time, the connecting block changes from a vertical state to an inclined state, and the arc-shaped limit block located in the radial limit groove 1 changes from a convex shape to a concave shape, and the arc-shaped limit block is located in the storage groove 1.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. Simple processing and low cost: The arc top flat key connection method of the present invention uses modern milling technology. When processing the shaft hole, the rotating part can be clamped once to complete the processing of the shaft hole and the arc top flat keyway without adding additional processes. Compared with traditional processing methods, it reduces complex processing steps such as slotting machines or wire cutting, significantly improves processing efficiency, reduces processing costs, and is particularly suitable for small batch production and special-shaped parts processing;

[0016] 2. Accurate positioning and high stability: By pushing the push block, the lateral rod drives the connecting block from an inclined state to a vertical state, and then changes the arc-shaped limit block from an inner concave shape to an outer convex shape, so that its top moves into the fixed column 1, achieving accurate positioning during assembly. This design effectively prevents radial and axial movement of the shaft and the shaft hole during the transmission process, greatly enhances the stability of the connection, ensures the accuracy of mechanical transmission, and can operate stably even in a vibrating environment;

[0017] 3. Significant anti-loosening effect: The unique limit structure design makes the key and keyway fit more closely in a vibration environment. The interaction between the arc limit block and the axial limit block effectively prevents the key from loosening, improves the anti-loosening performance, extends the service life of the mechanical device, and reduces equipment failures and maintenance times caused by loosening;

[0018] 4. Wide range of applications: This arc top flat key connection method is suitable for a variety of mechanical transmission scenarios, especially for machinery in a vibration environment with high requirements for transmission stability and anti-loosening performance, such as construction machinery, mining equipment, etc. Its good performance can meet the needs of different industries and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a stereoscopic diagram of a connection method of an arc top flat key, in which a rotating part and a transmission shaft are connected through an arc top flat key;

[0020] Figure 2 It is an exploded view of a connection method of an arc top flat key, in which a rotating part and a transmission shaft are connected through an arc top flat key;

[0021] Figure 3 It is a structural schematic diagram of the installation position of the push block and the arc top flat key member in a connection method of the arc top flat key;

[0022] Figure 4 The present invention is a schematic diagram of the structure of the installation location of the arc-shaped limit block and the rotating part in a connection method of an arc top flat key.

[0023] In the figure:

[0024] 10. Rotating part; 11. Transmission shaft; 12. Arc top flat key part; 13. Shaft hole; 14. Arc top flat key slot; 15. Flat key fixing slot;

[0025] 20. Radial limit groove one; 21. Storage groove one; 22. Storage groove two; 23. Arc limit block; 24. Fixed column one; 25. Connecting block; 26. Transverse rod; 27. Push block; 28. Axial limit groove one; 29. ​​Axial limit block one; 30. Axial limit block two. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] See also Figure 1-4 The present invention provides a technical solution: a connection method of an arc top flat key, comprising the following steps:

[0028] S1: Fix the rotating part 10 and process the shaft hole 13; S2: The rotating part 10 remains clamped, and the arc-top flat key groove 14 is processed at the opening of the shaft hole 13 by using the side milling method of the milling cutter; S3: The rectangular flat key is processed into an arc-top flat key part 12, and the bottom of the arc-top flat key part 12 is an arc angle; S4: Process the flat key fixing groove 15 on the transmission shaft 11; S5: The rotating part 10 and the transmission shaft 11 are connected through the arc-top flat key part 12.

[0029] It should be noted that this processing flow optimizes the process steps. In the processing stage of the shaft hole 13, the rotating part 10 only needs to be clamped once to complete the processing of the shaft hole 13 and the arc top flat keyway 14, avoiding the error accumulation caused by multiple clamping in the traditional processing method and improving the processing accuracy. Moreover, one-time clamping reduces the clamping time and equipment adjustment time, improves the overall processing efficiency, and reduces the processing cost.

[0030] In S4, the bottom of the flat key fixing groove 15 is an arc angle and is adapted to the bottom of the arc top flat key member 12, thereby reducing the risk of stress concentration and extending the service life of the device.

[0031] It should be noted here that: during the mechanical transmission process, stress concentration is prone to occur at the contact point between the key and the keyway. The stress concentration phenomenon is more obvious at the bottom of the keyway with the traditional clear angle design, and long-term use may cause damage to the keyway or key. In this method, the flat key fixing groove 15 and the arc angle at the bottom of the arc top flat key part 12 are adapted to each other, so that the stress on the contact surface can be distributed more evenly. In this way, under the same load, the stress condition of the key and the keyway is greatly improved, which significantly reduces the risk of failure forms such as fatigue cracks and fractures caused by stress concentration, thereby extending the service life of the entire device and reducing the frequency and cost of equipment maintenance and replacement of parts.

[0032] S2 also includes S21, machining an arc-shaped radial limiting groove 20 in the middle of the top inner wall of the arc top flat key groove 14 by a milling cutter.

[0033] It should be noted here that the setting of the radial limit groove 20 provides a precise radial positioning structure for the arc limit block 23 installed later. When the arc top flat key member 12 is installed in the arc top flat key groove 14 of the shaft hole 13, the arc limit block 23 can be embedded in the radial limit groove 20. This design effectively limits the radial movement of the arc top flat key member 12 in the shaft hole 13, ensuring that the transmission shaft 11 and the rotating member 10 always maintain an accurate relative position relationship during the mechanical transmission process, improving the stability and accuracy of the transmission, and is particularly suitable for mechanical equipment with high transmission accuracy requirements, such as precision machine tools, automated production lines, etc.

[0034] S3 also includes S31, processing a storage groove 1 21 located inside the shaft hole 13 on the top of the arc top flat key member 12, processing a storage groove 2 22 located outside the shaft hole 13 on the top of the arc top flat key member 12, and the bottom of the storage groove 1 21 is connected with the bottom of the storage groove 2 22 through a horizontally arranged storage groove 3.

[0035] It should be noted here that the connecting structure of storage slot 1 21, storage slot 2 22 and storage slot 3 constructs a flexible spatial layout. On the one hand, it provides installation positions for the arc-shaped limit block 23, transverse rod 26, push block 27 and other components that are installed later, so that the entire limit structure can be arranged reasonably. On the other hand, this design enhances the integrity and compactness of the key connection, avoids additional space occupation, and is conducive to the miniaturization design of mechanical equipment. Moreover, the presence of the storage slot can also reduce the weight of the arc-top flat key 12 to a certain extent, and achieve lightweight design without affecting its strength and performance, thereby improving the utilization efficiency of materials.

[0036] S3 also includes S32, the top of the storage slot 1 21 is plugged with an arc-shaped limit block 23, a vertically downwardly arranged fixed column 1 24 is fixed to the inner recess at the bottom center of the arc-shaped limit block 23, the bottom of the fixed column 24 is embedded and rotatably connected with a vertically arranged connecting block 25, the bottom of the connecting block 25 is embedded and rotatably connected with a horizontally arranged transverse rod 26, the other end of the transverse rod 26 passes through the storage slot 3 and is fixed with a push block 27, the push block 27 is slidably connected to the storage slot 22 in the horizontal direction, and the top of the push block 27 is located above the storage slot 22.

[0037] It should be noted here that this series of mutually cooperating parts form a sophisticated limiting and adjusting mechanism. When the push block 27 is pushed, the push block 27 drives the transverse rod 26 to move, and through the transmission of the connecting block 25 and the fixed column 24, the arc limit block 23 changes shape and moves position. During the installation process, this structure can easily adjust the state of the arc limit block 23 so that it can better cooperate with the radial limit groove 20 to achieve precise positioning. When the machine is running, the arc limit block 23 can automatically adjust according to the force conditions, enhance the anti-loosening ability of the key connection, ensure the reliable connection between the transmission shaft 11 and the rotating member 10, and effectively prevent the key from moving and falling off even under complex working conditions such as vibration and impact.

[0038] S3 also includes S33, in which an axial limit block 230 located in a storage groove 21 is fixed to the top of the transverse rod 26, an axial limit groove 2 is provided at the top of the transverse rod 26 near the axial limit block 230, an axial limit groove 2 is clamped in the axial limit groove 2 and is fixed to the top of the transverse rod 26, and an axial limit groove 28 adapted to the axial limit block 29 is provided at the top of one end of the storage groove 3 away from the axial limit block 230.

[0039] It should be noted here that the design of the axial limit block 1 29, the axial limit block 2 30, the axial limit groove 1 28, and the axial limit groove 2 further improves the limit system of the key connection. They can accurately limit the axial movement range of the transverse rod 26, ensuring the position accuracy of each component during the adjustment of the arc limit block 23. During the mechanical transmission process, the displacement of the transverse rod 26 caused by the axial force is effectively prevented, ensuring that the arc limit block 23 is always in the correct working position and maintaining the stability of the key connection. This axial limit structure cooperates with the radial limit structure to fully constrain the movement of the arc top flat key member 12, greatly improving the reliability and stability of the connection between the transmission shaft 11 and the rotating member 10, and is suitable for mechanical transmission under various complex working conditions.

[0040] The bottoms of both ends of the arc-shaped limit block 23 are rectangular structures. When the arc-shaped limit block 23 is naturally extended, the distance between the two ends of its bottom is greater than the distance between the two ends of the bottom opening of the radial limit groove 20. A notch is provided at the top of the storage groove 21, and the bottom of the arc-shaped limit block 23 abuts against the two notches respectively.

[0041] It should be noted here that the rectangular structure at the bottom of both ends of the arc limit block 23 and the abutment design with the notch at the top of the storage groove 21 enhance the stability of the arc limit block 23 in the storage groove 21. In the natural state, the two ends of the bottom of the arc limit block 23 are tightly abutted with the notch, which limits its shaking in the horizontal direction. When the arc limit block 23 is embedded in the radial limit groove 20, this structure can ensure a good fit between it and the radial limit groove 20, and improve the accuracy and reliability of the radial limit. Moreover, this design also facilitates the installation and disassembly of the arc limit block 23, reduces the difficulty of maintenance, and improves the maintainability of the equipment.

[0042] When the axial limit block 29 moves into the axial limit groove 28, the axial limit block 230 abuts against the inner wall of the opening at the connection between the storage groove 21 and the storage groove 3. At this time, the connecting block 25 changes from a vertical state to an inclined state, and the arc-shaped limit block 23 located in the radial limit groove 20 changes from a convex shape to a concave shape, and the arc-shaped limit block 23 is located in the storage groove 21.

[0043] It should be noted here that this structural change process realizes the self-locking function of the key connection. When the axial limit block 29 enters the axial limit groove 28, it triggers a series of structural changes, causing the arc-shaped limit block 23 to change from convex to concave and be received in the storage groove 21. When the shaft hole 13 and the transmission shaft 11 are connected, a tight locking state is formed. During the operation of the machine, this self-locking structure can effectively prevent the key from loosening due to external forces such as vibration and impact, greatly improving the reliability of the key connection. Moreover, this self-locking process does not require additional external devices or operations, and is completely realized by the movement of the structure itself, which simplifies the operation process and improves the convenience of the equipment. It is suitable for key mechanical parts with extremely high requirements for connection reliability.

[0044] Working principle:

[0045] S1: Fixing of rotating parts and machining of shaft holes: Select appropriate fixtures to firmly fix the rotating part 10 on the milling machine. According to the design requirements, adjust the tool parameters and cutting process parameters of the milling machine, and use the milling cutter to accurately machine the shaft hole 13. During the machining process, the dimensional accuracy, cylindricity and other indicators of the shaft hole 13 must be strictly controlled to ensure that it meets the design standards, providing a good foundation for subsequent keyway machining and parts assembly.

[0046] S2: Arc top flat keyway processing: The rotating part 10 remains in the clamping state. This step is crucial and can effectively reduce the clamping error. Replace the milling cutter suitable for side milling, and perform side milling operation at the opening of the shaft hole 13 according to the pre-set processing trajectory to process the arc top flat keyway 14. If it involves processing an arc-shaped radial limit groove 20 in the middle of the top inner wall of the arc top flat keyway 14;

[0047] S21: After the flat keyway is processed, the position of the milling cutter and the cutting parameters are adjusted, and the milling operation is continued to ensure the dimensional accuracy and surface quality of the radial limit groove 20.

[0048] S3: Arc top flat key processing: first prepare a rectangular flat key blank, and process a circular arc that meets the design requirements on the top of the flat key through milling or grinding and other processing techniques, and make it into an arc top flat key 12, ensuring that the bottom of the arc top flat key 12 is an arc angle, which is compatible with the arc top flat key groove 14 on the shaft hole 13 and the flat key fixing groove 15 on the transmission shaft 11. During the processing, the curvature and dimensional accuracy of the arc top, as well as the shape and dimensional accuracy of the bottom arc angle, must be guaranteed.

[0049] S4: Processing of the flat key fixing groove of the transmission shaft: Clamp the transmission shaft 11 on a suitable machine tool, usually a milling machine or a grinder. According to the design requirements, process the flat key fixing groove 15 to ensure that its bottom is an arc angle and accurately fits the bottom of the arc top flat key piece 12. During the processing, strictly control the dimensional accuracy, position accuracy and surface roughness of the flat key fixing groove 15 to ensure the matching accuracy with the arc top flat key piece 12 and reduce the risk of stress concentration.

[0050] S5: Assembly and adjustment: Before assembly, carefully clean the shaft hole 13, the arc top flat key groove 14, the flat key fixing groove 15 and the arc top flat key piece 12 from iron filings, oil stains and other impurities to ensure the cleanliness of the connection parts. Install the arc top flat key piece 12 in the arc top flat key groove 14 of the shaft hole 13, and then insert the transmission shaft 11 into the shaft hole 13 so that the arc top flat key piece 12 is embedded in the flat key fixing groove 15 of the transmission shaft 11.

[0051] S51: Push the push block 27, so that the transverse rod 26 drives the connecting block 25 from an inclined state to a vertical state, and the connecting block 25 pushes the arc-shaped limit block 23 from an inner concave shape to an outer convex shape, and the top of the arc-shaped limit block 23 moves into the fixed column 24 to complete precise positioning and enhance the anti-loosening effect.

[0052] After the assembly is completed, the connection parts are checked to ensure that the arc top flat key piece 12 is tightly matched with the arc top flat key groove 14 and the flat key fixing groove 15 without any looseness.

Claims

1. A connection method of an arc top flat key, characterized in that: The following steps are involved: S1: fix the rotating part (10) and process the shaft hole (13); S2: The rotating member (10) remains clamped, and a side milling method of a milling cutter is used at the shaft hole (13) to machine an arc top flat keyway (14) at the opening of the shaft hole (13); S3: Processing the rectangular flat key into an arc-top flat key piece (12), wherein the bottom of the arc-top flat key piece (12) is an arc angle; S4: Processing the flat key fixing groove (15) on the transmission shaft (11); S5: The rotating member (10) and the transmission shaft (11) are connected via an arc top flat key member (12).

2. A method for connecting an arc top flat key according to claim 1, characterized in that: In the above S4, the bottom of the flat key fixing groove (15) is an arc angle and is adapted to the bottom of the arc top flat key member (12).

3. A method for connecting an arc top flat key according to claim 1, characterized in that: The above-mentioned S2 also includes S21, in which an arc-shaped radial limiting groove (20) is machined in the middle of the inner wall at the top of the arc-top flat keyway (14) by a milling cutter.

4. A method for connecting an arc top flat key according to claim 1, characterized in that: The S3 further includes S31, wherein a first storage groove (21) located inside the shaft hole (13) is processed on the top of the arc-top flat key member (12), and a second storage groove (22) located outside the shaft hole (13) is processed on the top of the arc-top flat key member (12), and the bottom of the first storage groove (21) is connected to the bottom of the second storage groove (22) through a horizontally arranged third storage groove.

5. A method for connecting an arc top flat key according to claim 4, characterized in that: The S3 further includes S32, wherein an arc-shaped limit block (23) is inserted into the top of the storage slot 1 (21), a fixed column 1 (24) arranged vertically downward is fixed at the inner concave portion at the bottom center of the arc-shaped limit block (23), a vertically arranged connecting block (25) is embedded in the bottom of the fixed column 1 (24) and is rotatably connected, a horizontally arranged transverse rod (26) is embedded in the bottom of the connecting block (25) and is rotatably connected, the other end of the transverse rod (26) passes through the storage slot 3 and is fixed with a push block (27), the push block (27) is slidably connected to the storage slot 2 (22) in the horizontal direction, and the top of the push block (27) is located above the storage slot 2 (22).

6. A method for connecting an arc top flat key according to claim 5, characterized in that: The S3 also includes S33, wherein an axial limit block 2 (30) located in the storage groove 1 (21) is fixed on the top of the transverse rod (26), an axial limit groove 2 is provided on the top of the transverse rod (26) near the axial limit block 2 (30), an axial limit block 1 (29) fixed to the top of the transverse rod (26) is clamped in the axial limit groove 2, and an axial limit groove 1 (28) adapted to the axial limit block 1 (29) is provided on the top of one end of the storage groove 3 away from the axial limit block 2 (30).

7. A method for connecting an arc top flat key according to claim 6, characterized in that: The bottoms of both ends of the arc-shaped limit block (23) are rectangular parallelepiped structures. When the arc-shaped limit block (23) is naturally extended, the distance between the two ends of the bottom is greater than the distance between the two ends of the bottom opening of the radial limit groove (20). The top of the storage groove (21) is provided with a notch, and the bottom of the arc-shaped limit block (23) is respectively abutted against the two notches.

8. A method for connecting an arc top flat key according to claim 7, characterized in that: When the axial limit block 1 (29) moves into the axial limit groove 1 (28), the axial limit block 2 (30) abuts against the inner wall of the opening at the connection between the storage groove 1 (21) and the storage groove 3. At this time, the connecting block (25) changes from a vertical state to an inclined state, and the arc-shaped limit block (23) located in the radial limit groove 1 (20) changes from an outer convex shape to an inner concave shape, and the arc-shaped limit block (23) is located in the storage groove 1 (21).

Images