CN221170458U - Large-scale extruder low stress concentration spline shaft and spline structure - Google Patents
Large-scale extruder low stress concentration spline shaft and spline structure Download PDFInfo
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- CN221170458U CN221170458U CN202323130249.8U CN202323130249U CN221170458U CN 221170458 U CN221170458 U CN 221170458U CN 202323130249 U CN202323130249 U CN 202323130249U CN 221170458 U CN221170458 U CN 221170458U
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- key groove
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- 238000000034 method Methods 0.000 claims description 2
- 239000012141 concentrate Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 2
- 238000010030 laminating Methods 0.000 description 4
- 230000002035 prolonged effect Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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Abstract
The application relates to a low-stress concentrated spline shaft and a spline structure of a large-scale extruder, which relate to the technical field of extruders and comprise a mandrel, wherein a key groove is arranged on the mandrel, an arc-shaped surface is arranged on the bottom wall of the key groove, two ends of the arc-shaped surface respectively extend to two side walls of the key groove which are oppositely arranged, and the arc-shaped surface is sunken towards the direction away from an opening of the key groove. The application has the effects of reducing stress concentration at the bottom of the key groove, improving the stress intensity of the mandrel and prolonging the service life of the mandrel.
Description
Technical Field
The application relates to the technical field of extruders, in particular to a low-stress concentration spline shaft and a spline structure of a large extruder.
Background
The spindle is mechanically driven, and has the same functions as a flat key, a semicircular key and an inclined key, and is used for transmitting mechanical torque.
The mandrel is divided into a rectangular tooth mandrel and an involute tooth spline, the involute mandrel is usually used for a large extruder screw mandrel, the involute tooth profile is adopted on the side wall of a key groove of the involute core shaft, the flat tooth root is adopted on the bottom of a key groove limited by a cutter, but when the involute tooth spline is used, the stress concentration between the side wall of the key groove and the bottom wall is large, so that the stress intensity of the mandrel is low, and the service life of the mandrel is shortened.
Disclosure of utility model
In order to solve the problems of low stress intensity and short service life of a mandrel caused by larger stress concentration between the side wall and the bottom wall of a key slot, the application provides a spline shaft with low stress concentration for a large-sized extruder and a spline structure.
The application provides a low-stress concentration spline shaft of a large-scale extruder, which adopts the following technical scheme:
The utility model provides a large-scale extruder low stress concentration integral key shaft, includes the dabber, the dabber is equipped with the keyway, be equipped with the arcwall face on the keyway diapire, the both ends of arcwall face extend respectively to on the opposite both sides wall that sets up of keyway, the arcwall face is towards keeping away from keyway opening direction is sunken.
By adopting the technical scheme, when the mandrel is driven, the arc-shaped surfaces are adopted between the two side walls of the key groove to be excessive, and compared with the traditional design mode of the flat tooth root, the stress concentration at the bottom of the key groove can be reduced, so that the stress intensity of the mandrel can be improved, and the service life of the mandrel can be prolonged.
In a specific embodiment, the two opposite side walls of the key slot are first connecting surfaces, and the first connecting surfaces are tangential planes of the arc-shaped surfaces.
By adopting the technical scheme, the first connecting surface is used as the tangent plane of the arc-shaped surface, so that the transition between the first connecting surface and the arc-shaped surface is smoother, and the stress concentration at the joint of the first connecting surface and the arc-shaped surface is reduced.
The application also provides a spline structure with low stress concentration for a large extruder, which adopts the following technical scheme:
the spline structure with the low stress concentration of the large extruder comprises a spline shaft with the low stress concentration of the large extruder, a rotating piece is sleeved on the mandrel, and a connecting key used for being inserted into the key slot is arranged on the rotating piece.
Through adopting above-mentioned technical scheme, when rotating member and dabber are connected, insert the key of rotating member on the keyway of dabber in, accomplish the installation of rotating member and dabber.
In a specific embodiment, a gap is left between the connecting key and the arcuate surface.
Through adopting above-mentioned technical scheme, through the clearance between connecting key and the arcwall face, can effectively avoid connecting key and arcwall face contact, reduce the stress concentration between connecting key and the keyway.
In a specific implementation manner, two opposite side walls of the key slot are first connecting surfaces, the first connecting surfaces are planes, two opposite side walls of the connecting key are second connecting surfaces, the first connecting surfaces can be attached to the second connecting surfaces, and the mandrel can rely on attachment of the first connecting surfaces and the second connecting surfaces to push the rotating member to rotate.
Through adopting above-mentioned technical scheme, through the laminating of second junction surface and first junction surface, can improve the area of contact of dabber and rotating member to reduce the stress concentration of action between the two.
In a specific embodiment, the angle between the planes of the two first connection surfaces is α, and the angle between the planes of the two second connection surfaces is β, α=β.
Through adopting above-mentioned technical scheme, set up alpha = beta, can make the better laminating of first joint face and second joint face.
In a specific implementation, a maximum central angle corresponding to two sides of the key groove with the axis of the mandrel as a center is θ, and α < θ.
In a specific embodiment, the middle positions of the two first connecting surfaces are close to each other to form a convex surface, two opposite side walls of the connecting key are third connecting surfaces, the two third connecting surfaces are close to each other to form a concave surface, and the first connecting surfaces can be attached to the third connecting surfaces.
Through adopting above-mentioned technical scheme, when the connecting key inserts the keyway, first joint face laminating with the third joint face, laminating through concave surface and convex surface can improve the area of action between connecting key and the dabber, reduces stress concentration between the two, improves the life of integral key shaft and rotating member.
In summary, the present application includes at least one of the following beneficial technical effects:
1. The arc surfaces are excessive between the two side walls of the key groove to replace the traditional design mode of the flat tooth root, so that the stress concentration at the bottom of the key groove can be reduced, the stress intensity of the mandrel is improved, and the service life of the mandrel is prolonged;
2. The contact area of the mandrel and the rotating piece can be increased through the lamination of the second connecting surface and the first connecting surface, so that the stress concentration of the action between the mandrel and the rotating piece is reduced, the running stability of the unit is improved, and the service lives of the rotating block and the mandrel are prolonged;
3. Through the clearance between connecting key and the arcwall face, can effectively avoid connecting key and arcwall face contact, reduce the stress concentration between connecting key and the keyway.
Drawings
FIG. 1 is a schematic view of a large extruder low stress concentration spline shaft according to an embodiment of the present application.
FIG. 2 is a schematic illustration of a low stress concentration spline configuration for a large extruder of example 1 of the present application.
Fig. 3 is an exploded view for showing the first connection face and the second connection face.
Fig. 4 is a schematic structural view for showing the first connection line and the second connection line.
FIG. 5 is a schematic illustration of a low stress concentration spline configuration for a large extruder of example 2 of the present application.
Fig. 6 is an exploded view for showing the first connection face and the third connection face.
Reference numerals illustrate: 1. a mandrel; 11. a key slot; 111. a first connection surface; 12. an arc surface; 2. a rotating member; 21. a through hole; 22. a connecting key; 221. a second connection surface; 23. a first connecting line; 24. a second connecting line; 25. and a third connecting surface.
Detailed Description
The application is described in further detail below with reference to fig. 1-6.
On one hand, the embodiment of the application discloses a low-stress concentration spline shaft of a large-scale extruder.
Referring to fig. 1, a low stress concentration spline shaft of a large extruder includes a mandrel 1, a plurality of key grooves 11 are arranged on the mandrel 1, the key grooves 11 are uniformly arranged at intervals along the circumferential direction of the mandrel 1 for a circle, two side walls of each key groove 11 which are oppositely arranged along the circumferential direction of the mandrel 1 are first connecting surfaces 111, an arc-shaped surface 12 is arranged on the bottom wall of the groove of each key groove 11, two ends of the arc-shaped surface 12 extend to the two first connecting surfaces 111 respectively, and the two first connecting surfaces 111 are two tangent planes of the arc-shaped surface 12.
The implementation principle of the low-stress concentration spline shaft of the large-scale extruder provided by the embodiment of the application is as follows: when the mandrel 1 is driven, the arc-shaped surfaces 12 are adopted between the two side walls of the key groove 11, and compared with the traditional design mode of the flat tooth root, the application can reduce the stress concentration at the bottom of the key groove 11, thereby improving the stress intensity of the mandrel 1, prolonging the service life of the mandrel 1, and avoiding quenching cracks in the processing process of the key groove 11 due to avoiding the stress concentration.
On the other hand, the embodiment of the application also discloses a low-stress concentration spline structure of the large-scale extruder.
Example 1
Referring to fig. 2 and 3, a low stress concentration spline structure of a large-sized extruder includes the above-mentioned low stress concentration spline shaft of a large-sized extruder, and further includes a rotating member 2, wherein the rotating member 2 is usually a threaded element or a meshing disc in the extruder, the rotating member 2 is provided with a through hole 21 for inserting a mandrel 1, a plurality of connection keys 22 are arranged on a side wall of the through hole 21, the connection keys 22 are in one-to-one correspondence with the key grooves 11, and two first connection surfaces 111 are planes. Two opposite side walls of the connecting key 22 are second connecting surfaces 221, each second connecting surface 221 is a plane, the connecting key 22 can be inserted into the key groove 11 and is attached to the first connecting surface 111, when the connecting key 22 is completely inserted into the key groove 11, a gap exists between the connecting key 22 and the arc-shaped surface 12, and meanwhile, a gap exists between the outer wall of the mandrel 1 and the inner wall of the through hole 21.
When the rotating member 2 and the mandrel 1 are installed, the rotating member 2 is sleeved on the mandrel 1, the mandrel 1 is inserted into the through hole 21, the connecting key 22 is inserted into the key groove 11, at the moment, the first connecting surface 111 is attached to the second connecting surface 221, a gap exists between the connecting key 22 and the arc-shaped surface 12, the mandrel 1 drives the rotating member 2 to rotate by pushing the second connecting surface 221 through the first connecting key 22, the first connecting surface 111 and the second connecting surface 221 are of planar design, and the first connecting surface and the second connecting surface 221 can be attached to each other, so that the contact area of the connecting part of the mandrel 1 and the rotating member 2 can be increased, and the stress concentration of the mandrel 1 and the rotating member 2 is reduced.
Referring to fig. 3, the included angle between the planes of the two first connection surfaces 111 in one key slot 11 is α, and the included angle between the two second connection surfaces 221 on the connection key 22 corresponding to the key slot 11 is β, α=β, so that the first connection surface 111 and the second connection surface 221 can be ensured to be attached more tightly.
Referring to fig. 4, the connection line between the first connection surface 111 and the mandrel 1 is the first connection line 23, the connection line between the first connection surface 111 and the arc surface 12 is the second connection line 24, the included angle between the two first connection lines 23 and the axis of the mandrel 1 is θ, the included angle between the two second connection lines 24 and the axis of the mandrel 1 is γ, θ > α > γ, and because θ > α > γ, a triangular tooth-shaped bump is formed between the two key grooves 11, and the bump is meshed with the tooth groove formed between the two connection keys 22.
The implementation principle of the embodiment 1 is as follows: when the rotating member 2 and the mandrel 1 are installed, the rotating member 2 is sleeved on the mandrel 1, the connecting key 22 is inserted into the key groove 11, at the moment, a gap exists between the connecting key 22 and the arc-shaped surface 12, a gap exists between the outer wall of the mandrel 1 and the inner wall of the through groove, the first connecting surface 111 and the second connecting surface 221 are designed to be planar, and can be mutually attached, so that the contact area of the joint of the mandrel 1 and the rotating member 2 can be increased, the stress concentration of the mandrel 1 and the rotating member 2 is reduced, the running stability of a unit is improved, and the service life of the rotating member 2 and the mandrel 1 is prolonged.
Example 2
Referring to fig. 5 and 6, the difference between this embodiment and embodiment 1 is that the middle positions of the two first connection surfaces 111 are close to each other to form a convex surface, the two side walls of the connection key 22 facing away are third connection surfaces 25, the middle positions of the third connection surfaces 25 are close to each other to form a concave surface, the middle positions of the third connection surfaces 25 are concave toward the inside of the rotating member 2, and the first connection surfaces 111 and the third connection surfaces 25 are attached to each other.
The implementation principle of the embodiment 2 is as follows: when the connecting key 22 is inserted into the key groove 11, the first connecting surface 111 is attached to the third connecting surface 25, and the attaching of the concave surface to the convex surface can improve the acting area between the connecting key 22 and the spindle 1, reduce the stress concentration between the two, and improve the service life of the spline shaft and the rotating member 2.
The above embodiments are not intended to limit the scope of the present application, so: all equivalent changes in structure, shape and principle of the application should be covered in the scope of protection of the application.
Claims (8)
1. The utility model provides a large-scale extruder low stress concentration integral key shaft, includes dabber (1), its characterized in that: the mandrel (1) is provided with a key groove (11), the bottom wall of the key groove (11) is provided with an arc-shaped surface (12), two ends of the arc-shaped surface (12) respectively extend to two side walls of the key groove (11) which are oppositely arranged, and the arc-shaped surface (12) is sunken towards the direction away from the opening of the key groove (11).
2. The large extruder low stress concentration spline shaft of claim 1, wherein: two opposite side walls of the key groove (11) are first connecting surfaces (111), and the first connecting surfaces (111) are tangent planes of the arc-shaped surfaces (12).
3. A large-scale extruder low stress concentrates spline structure, its characterized in that: the large-scale extruder low-stress concentrated spline shaft comprises the large-scale extruder low-stress concentrated spline shaft, wherein a rotating piece (2) is sleeved on the mandrel (1), and a connecting key (22) used for being inserted into the key groove (11) is arranged on the rotating piece (2).
4. A large extruder low stress concentration spline structure according to claim 3, wherein: a gap is reserved between the connecting key (22) and the arc-shaped surface (12).
5. The large extruder low stress concentration spline structure of claim 4, wherein: the first connecting surface (111) is a plane, two side walls deviating from each other of the connecting key (22) are second connecting surfaces (221), the first connecting surface (111) can be attached to the second connecting surfaces (221), and the mandrel (1) can rely on the attachment of the first connecting surface (111) and the second connecting surfaces (221) to push the rotating piece (2) to rotate.
6. The large extruder low stress concentration spline structure of claim 5, wherein: the included angle of the planes of the two first connecting surfaces (111) is alpha, and the included angle of the planes of the two second connecting surfaces (221) is beta, wherein alpha=beta.
7. The large extruder low stress concentration spline structure of claim 6, wherein: the method is characterized in that: and the maximum central angle corresponding to the two sides of the key groove (11) with the axis of the mandrel (1) as the center of a circle is theta, and alpha is smaller than theta.
8. The large extruder low stress concentration spline structure of claim 4, wherein: the middle positions of the two first connecting surfaces (111) are close to each other to form a convex surface, two opposite side walls of the connecting key (22) are third connecting surfaces (25), the two third connecting surfaces (25) are close to each other to form a concave surface, and the first connecting surfaces (111) can be attached to the third connecting surfaces (25).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323130249.8U CN221170458U (en) | 2023-11-20 | 2023-11-20 | Large-scale extruder low stress concentration spline shaft and spline structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323130249.8U CN221170458U (en) | 2023-11-20 | 2023-11-20 | Large-scale extruder low stress concentration spline shaft and spline structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221170458U true CN221170458U (en) | 2024-06-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202323130249.8U Active CN221170458U (en) | 2023-11-20 | 2023-11-20 | Large-scale extruder low stress concentration spline shaft and spline structure |
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| Country | Link |
|---|---|
| CN (1) | CN221170458U (en) |
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2023
- 2023-11-20 CN CN202323130249.8U patent/CN221170458U/en active Active
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