Anti-fracture transmission shaft

Abstract

The utility model relates to the technical field of mechanical products, in particular to an anti-fracture transmission shaft which comprises a first shaft body, a second shaft body and a shaft tube, one end of the first shaft body is connected with a power output end through a first flange plate, and the other end of the first shaft body is provided with a second flange plate. The third flange plate is connected with the second flange plate through connecting bolts; one end of the shaft tube sleeves the end, away from the third flange plate, of the second shaft body, and the shaft tube and the second shaft body are connected through first annular welding; a plurality of first reinforcing ribs are arranged around the first annular welding ring; the end, away from the second shaft body, of the shaft pipe is connected with an equipment end through a fourth flange. According to the anti-breakage transmission shaft, it can be guaranteed that the transmission shaft can work stably in the operation process of equipment, shaft breakage is effectively prevented, economic losses are avoided, and safety of workers is protected.

Description

Technical Field

[0001] This utility model relates to the field of mechanical product technology, and in particular to a fracture-resistant transmission shaft. Background Technology

[0002] The drive shaft transmits mechanical torque through rotational motion, transferring the power generated by working equipment such as motors and engines to the working parts, thus enabling continuous mechanical power to perform work.

[0003] Shaft breakage is a frequent occurrence in equipment such as continuous soaking machines, vegetable washing machines, pre-ash tanks, destoners, and various screw conveyors. Shaft breakage primarily occurs at the circumferential weld of the drive shaft and the shoulder at the direct change point of the drive shaft. Shaft breakage in critical equipment on an industrial production line can trigger simultaneous shutdowns of upstream and downstream equipment, causing widespread production interruptions and resulting in economic losses. Furthermore, breakage of a high-speed rotating shaft can cause metal fragments to fly, potentially leading to personal injury or death. Utility Model Content

[0004] To address the aforementioned problems, this utility model provides a fracture-resistant drive shaft that ensures stable operation of the drive shaft during equipment operation, effectively prevents shaft breakage, avoids economic losses, and protects worker safety.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A fracture-resistant drive shaft includes a first shaft body, a second shaft body, and a shaft tube. One end of the first shaft body is connected to a power output end via a first flange, and the other end is provided with a second flange. One end of the second shaft body is provided with a third flange, and the third flange is connected to the second flange via connecting bolts.

[0007] One end of the shaft tube is sleeved on the end of the second shaft body away from the third flange, and the shaft tube and the second shaft body are connected by a first annular weld; the first annular weld is surrounded by a plurality of first reinforcing ribs, one end of the first reinforcing ribs is fixedly connected to the second shaft body and the shaft tube respectively, and the other end of the first reinforcing ribs is fixedly connected to the third flange; the end of the shaft tube away from the second shaft body is connected to the equipment end through a fourth flange.

[0008] Furthermore, the first shaft body has a first arc on its shoulder near the first flange, the first shaft body has a second arc on its shoulder near the second flange, and the second shaft body has a third arc on its shoulder near the third flange.

[0009] Furthermore, the radius of the first arc is smaller than the radii of the second and third arcs, the radius of the second arc is equal to the radius of the third arc, and the radii of both the second and third arcs are 10-20 mm.

[0010] Furthermore, a plurality of key blanks are uniformly arranged around the outer walls of the second flange and the third flange. The key blanks are arranged along the axial direction of the first shaft and the second shaft, and the key blanks are welded to the outside of the second flange and the third flange.

[0011] Furthermore, the side of the second shaft away from the third flange is connected to the shaft tube by a flat key.

[0012] Furthermore, the end of the shaft tube away from the second shaft body is connected to the fourth flange via a second annular weld; the end of the shaft tube away from the second shaft body is provided with a plurality of second reinforcing ribs, the second reinforcing ribs are arranged around the second annular weld, and the two ends of the second reinforcing ribs are respectively fixedly connected to the shaft tube and the fourth flange.

[0013] The beneficial effects of this utility model are:

[0014] By setting a first reinforcing rib at the first annular weld and a second reinforcing rib at the second annular weld, and by setting a flat key at the connection between the second shaft and the shaft tube, the shear force generated by the torque at the weld can be distributed, thus strengthening the first and second annular welds. By setting the second and third arcs as large-radius transition arcs of 10-20mm, the concentrated stress of the shaft shoulder can be dispersed. At the same time, the second and third arcs are at appropriate radius transition arcs, which can avoid affecting the installation accuracy of the drive shaft. A key blank is set on the outer wall at the connection between the third flange and the second flange to prevent corrosion and wear caused by loose connecting bolts, which could lead to shear fracture. This can assist the connecting bolts in connecting the third flange and the second flange. Attached Figure Description

[0015] Figure 1 This is a structural schematic diagram of a preferred embodiment of the anti-breakage transmission shaft of this utility model.

[0016] In the figure, 1-first shaft, 11-first flange, 12-second flange, 13-first arc, 14-second arc, 2-second shaft, 21-third flange, 22-third arc, 3-shaft tube, 301-first annular weld, 302-second annular weld, 31-fourth flange, 4-connecting bolt, 51-first reinforcing rib, 52-second reinforcing rib, 6-key blank, 7-flat key. Detailed Implementation

[0017] 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.

[0018] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is considered "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is considered "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0020] Please see Figure 1 The preferred embodiment of the present invention provides a fracture-resistant transmission shaft, comprising a first shaft body 1, a second shaft body 2, and a shaft tube 3.

[0021] One end of the first shaft 1 is connected to the power output end via the first flange 11, and the other end is provided with a second flange 12. One end of the second shaft 2 is provided with a third flange 21, and the third flange 21 is connected to the second flange 12 via connecting bolts 4.

[0022] One end of the shaft tube 3 is sleeved on the end of the second shaft body 2 away from the third flange 21, and the shaft tube 3 is connected to the second shaft body 2 by a first annular weld 301; the first annular weld 301 is surrounded by a plurality of first reinforcing ribs 51, one end of the first reinforcing ribs 51 is fixedly connected to the second shaft body 2 and the shaft tube 3 respectively, and the other end of the first reinforcing ribs 51 is fixedly connected to the third flange 21.

[0023] The end of the shaft tube 3 away from the second shaft body 2 is connected to the equipment end through the fourth flange 31.

[0024] In this embodiment, the side of the second shaft 2 away from the third flange 21 is connected to the shaft tube 3 via a flat key 7. One or two flat keys 7 may be provided in this embodiment.

[0025] The end of the shaft tube 3 away from the second shaft body 2 is connected to the fourth flange 31 through the second annular weld 302.

[0026] A plurality of second reinforcing ribs 52 are provided at one end of the shaft tube 3 away from the second shaft body 2. The second reinforcing ribs 52 are arranged around the second annular weld 302, and the two ends of the second reinforcing ribs 52 are fixedly connected to the shaft tube 3 and the fourth flange 31 respectively.

[0027] The number of the first reinforcing rib 51 and the second reinforcing rib 52 can be set according to the diameter of the drive shaft, generally 3-6.

[0028] Since circumferential welds are an unreliable connection method, high-temperature welding in any process will change the metallographic structure of the base material, resulting in the strength, toughness, and fatigue performance of the heat-affected zone (the transition zone between the weld material and the base material) being lower than that of the base material. This makes it the origin of fatigue cracks and accelerates crack propagation.

[0029] By providing a first reinforcing rib 51 at the first annular weld 301 and a second reinforcing rib 52 at the second annular weld 302, and by providing a flat key 7 at the connection between the second shaft 2 and the shaft tube 3, the shear force generated by the torque at the weld can be shared, thereby strengthening the first annular weld 301 and the second annular weld 302.

[0030] In this embodiment, the first shaft 1 has a first arc 13 on its shoulder near the first flange 11, the first shaft 1 has a second arc 14 on its shoulder near the second flange 12, and the second shaft 2 has a third arc 22 on its shoulder near the third flange 21.

[0031] The radius of the first arc 13 is smaller than the radii of the second arc 14 and the third arc 22. The radius of the second arc 14 is equal to the radius of the third arc 22, and the radii of the second arc 14 and the third arc 22 are both 10-20mm.

[0032] Cracks are prone to occur at the shaft shoulder. Due to the abrupt change in diameter at the shaft shoulder, the torque per unit cross-sectional area drops, and stress concentration easily occurs at the shaft shoulder, which can lead to fatigue cracks or fracture. In this embodiment, the second arc 14 and the third arc 22 are set as large-radius transition arcs of 10-20mm to disperse the concentrated stress at the shaft shoulder. At the same time, the second arc 14 and the third arc 22 are at appropriate radius transition arcs, which can avoid affecting the installation accuracy of the drive shaft.

[0033] In this embodiment, a plurality of key blanks 6 are uniformly arranged around the outer walls of the second flange 12 and the third flange 21. The key blanks 6 are arranged along the axial direction of the first shaft 1 and the second shaft 2, and the key blanks 6 are welded to the outside of the second flange 12 and the third flange 21. The number of key blanks 6 in this embodiment can be set according to the diameter of the second flange 12 and the third flange 21, and generally 3-5 can be set.

[0034] A key blank 6 is provided on the outer wall at the connection between the third flange 21 and the second flange 12. This can prevent corrosion and wear caused by loosening of the connecting bolts 4, which could lead to shear fracture. This can assist the connecting bolts 4 in connecting the third flange 21 and the second flange 12.

Claims

1. A fracture-resistant drive shaft, characterized in that, It includes a first shaft (1), a second shaft (2) and a shaft tube (3). One end of the first shaft (1) is connected to the power output end through a first flange (11), and the other end is provided with a second flange (12). One end of the second shaft (2) is provided with a third flange (21), and the third flange (21) is connected to the second flange (12) through connecting bolts (4). One end of the shaft tube (3) is sleeved on the end of the second shaft body (2) away from the third flange (21), and the shaft tube (3) and the second shaft body (2) are connected by a first annular weld (301); the first annular weld (301) is surrounded by a plurality of first reinforcing ribs (51), one end of the first reinforcing ribs (51) is fixedly connected to the second shaft body (2) and the shaft tube (3) respectively, and the other end of the first reinforcing ribs (51) is fixedly connected to the third flange (21); the end of the shaft tube (3) away from the second shaft body (2) is connected to the equipment end through a fourth flange (31).

2. The anti-fracture transmission shaft according to claim 1, characterized in that: The first shaft (1) has a first arc (13) on its shoulder near the first flange (11), and the first shaft (1) has a second arc (14) on its shoulder near the second flange (12); the second shaft (2) has a third arc (22) on its shoulder near the third flange (21).

3. The anti-fracture transmission shaft according to claim 2, characterized in that: The radius of the first arc (13) is smaller than the radius of the second arc (14) and the third arc (22). The radius of the second arc (14) is equal to the radius of the third arc (22), and the radius of the second arc (14) and the radius of the third arc (22) are both 10-20mm.

4. The anti-fracture transmission shaft according to claim 1, characterized in that: The outer walls of the second flange (12) and the third flange (21) are uniformly surrounded by a plurality of key blanks (6), which are arranged along the axial direction of the first shaft (1) and the second shaft (2), and the key blanks (6) are welded to the outside of the second flange (12) and the third flange (21).

5. The anti-fracture transmission shaft according to claim 1, characterized in that: The side of the second shaft (2) away from the third flange (21) is connected to the shaft tube (3) by a flat key (7).

6. The anti-fracture transmission shaft according to claim 1, characterized in that: The end of the shaft tube (3) away from the second shaft body (2) is connected to the fourth flange (31) by a second annular weld (302); The shaft tube (3) is provided with a plurality of second reinforcing ribs (52) at one end away from the second shaft body (2). The second reinforcing ribs (52) are arranged around the second annular weld (302), and the two ends of the second reinforcing ribs (52) are fixedly connected to the shaft tube (3) and the fourth flange (31) respectively.

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