A coupling that automatically compensates for shaft angle deviation

Abstract

This utility model relates to a coupling, belonging to the technical field of mechanical transmission devices, specifically a coupling that automatically compensates for shaft angle deviation. It includes a greenhouse with a supporting structure inside, comprising columns and trusses. Multiple grooves are formed on the columns, and a roof is provided between the grooves. A drive device, including a motor, is mounted on the truss. In this utility model, the device designs a convex curved surface on the protruding side of the shaft. When the rotating shaft experiences angular deviation (maximum ±1.65°) due to deflection of the supporting structure or thermal deformation, the convex curved surface of the shaft maintains surface contact with the inner wall of the receiving component, avoiding the stress concentration of point contact in traditional planar fits. This design ensures uniform distribution of contact pressure, reducing wear rate by more than 80%, and is particularly suitable for large-span trusses experiencing shaft deflection due to self-weight sagging or thermal expansion and contraction, ensuring continuous and stable operation of the transmission system.

Description

Technical Field

[0001] This utility model relates to the field of mechanical transmission device technology, specifically a coupling that automatically compensates for shaft angle deviation. Background Technology

[0002] A coupling is a mechanical component used to connect the driving shaft and driven shaft in different mechanisms to rotate together and transmit motion and torque.

[0003] Traditional welded sliding couplings (such as flat shaft head-groove fit structures) have drawbacks in long shaft systems: when the supporting structure undergoes deflection (such as large-span greenhouse beams) or the shaft itself bends, misalignment of the shaft axis can lead to abnormal wear of the coupling. Especially in greenhouse shading systems, the drive shaft length often exceeds 20 meters, and the angular deviation caused by thermal deformation and structural deflection can reach more than 1.5°, accelerating coupling failure.

[0004] Based on this, the present invention proposes a coupling that automatically compensates for shaft angle deviation. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model proposes a coupling that automatically compensates for shaft angle deviation, which can compensate for shaft deviation caused by structural deflection and reduce wear by more than 80%. The optimal ratio of the radius of curvature R of the convex surface to the length L is 2-20, and ±1.65° deflection compensation can be achieved when R / L=17.5.

[0006] The technical solution to achieve the purpose of this utility model is as follows: a coupling for automatically compensating for axial angle deviation, comprising a greenhouse, wherein a supporting structure is provided inside the greenhouse, the supporting structure includes columns and trusses, multiple grooves are provided on the columns, a roof is provided between the grooves, a driving device is provided on the trusses, the driving device includes a motor, two rotating shafts are provided on the motor, and multiple driving racks are provided on the two rotating shafts, further comprising:

[0007] A coupling comprising a shaft protrusion and a receiving component, wherein the shaft protrusion is provided with a first shaft and a second shaft, the first shaft is provided with a rack and pinion transmission device, and the second shaft is provided with a chain transmission device.

[0008] Preferably, the protrusion of the shaft has a polygonal cross-sectional profile, and the receiving component has a profile surrounding the cross-sectional profile.

[0009] Preferably, the protrusion of the shaft and the receiving component are in a sliding fit, and can be displaced relative to each other along the axial direction to compensate for the length change caused by thermal deformation.

[0010] Preferably, the greenhouse is equipped with a curtain device, which includes multiple curtains, rigid end strips on the curtains, and multiple drive racks are fixedly connected to the rigid end strips by push-pull rods.

[0011] Compared with existing technologies, the significant advantages of this invention are:

[0012] In this invention, the device designs a convex curved surface on the raised side of the shaft. When the rotating shaft experiences angular deviation (up to ±1.65°) due to the deflection of the supporting structure or thermal deformation, the convex curved surface of the shaft always maintains surface contact with the inner wall of the receiving component, avoiding the stress concentration of point contact in traditional planar fits. This design ensures uniform distribution of contact pressure and reduces the wear rate by more than 80%. It is particularly suitable for large-span trusses that experience axial deflection due to their own weight or thermal expansion and contraction, ensuring continuous and stable operation of the transmission system. Attached Figure Description

[0013] The present invention will be further explained below with reference to the accompanying drawings and embodiments:

[0014] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0015] Figure 2 This is a three-dimensional structural diagram of the coupling in this utility model;

[0016] Figure 3 This is a partial side view of the coupling structure in this utility model.

[0017] Explanation of reference numerals in the attached figures:

[0018] 1. Greenhouse; 2. Column; 3. Truss; 4. Trench; 5. Roof; 6. Drive unit; 7. Curtain assembly; 8. Curtain; 9. Rigid end bar; 10. Motor; 11. Rotating shaft; 12. Drive rack; 13. Push-pull rod; 14. Chain drive device; 15. Rack and pinion drive device; 16. Shaft 1; 17. Shaft 2; 18. Coupling; 19. Shaft protrusion; 20. Receiving component. Detailed Implementation

[0019] The present invention will now be described in detail, and the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0020] This utility model provides an improved coupling that automatically compensates for axial angle deviations. The technical solution of this utility model is as follows:

[0021] like Figures 1-3 As shown, a coupling for automatically compensating for axial angle deviation includes a greenhouse 1, a supporting structure inside the greenhouse 1, the supporting structure including columns 2 and trusses 3, multiple grooves 4 opened on the columns 2, a roof 5 provided between the grooves 4, a drive device 6 provided on the trusses 3, the drive device 6 including a motor 10, two rotating shafts 11 provided on the motor 10, multiple drive racks 12 provided on the two rotating shafts 11, and further includes:

[0022] The coupling 18 includes a shaft protrusion 19 and a receiving component 20. The shaft protrusion 19 is attached to a rotating shaft 11 having a polygonal cross-sectional profile that intersects the axis laterally. The receiving component 20 is attached to another rotating shaft 11, and its cross-sectional profile surrounds the cross-sectional profile of the shaft protrusion 19, which intersects the axis laterally. At least one of the coupling 18 has a convex side profile along the axial direction. This coupling 18 allows slight lateral movement to the centerline and allows adjustment of alignment errors. The shaft protrusion 19 is provided with a first shaft 16 and a second shaft 17. The first shaft 16 is provided with a rack and pinion drive 15, and the second shaft 17 is provided with a chain drive 14. This design ensures uniform distribution of contact pressure and reduces wear rate by more than 80%. It is particularly suitable for large-span trusses 3 under conditions of axial deflection due to self-weight sagging or thermal expansion and contraction, ensuring continuous and stable operation of the transmission system.

[0023] Furthermore, such as Figure 2 and Figure 3 As shown, the protrusion 19 of the shaft has a polygonal cross-sectional profile, and the receiving component 20 has a profile surrounding the cross-sectional profile. When the rotating shaft 11 has an angular deviation (up to ±1.65°) due to the deflection of the support structure or thermal deformation, the convex surface of the protrusion 19 of the shaft always maintains surface contact with the inner wall of the receiving component 20, avoiding the stress concentration of point contact in traditional planar mating.

[0024] Furthermore, such as Figure 2 and Figure 3 As shown, the sliding fit between the protrusion 19 of the shaft and the receiving component 20 allows for an axial displacement of ≥10mm, effectively absorbing thermal deformation of the shaft system.

[0025] Furthermore, such as Figure 1 As shown, a curtain device 7 is provided inside the greenhouse 1. The curtain device 7 includes multiple curtains 8, rigid end strips 9 on the curtains 8, and multiple drive racks 12 are fixedly connected to the rigid end strips 9 through push-pull rods 13. The movement of the curtains 8 is controlled by the drive racks 12, which is used to protect the crops growing in the greenhouse 1 from excessive sunlight or to minimize the heat loss of the greenhouse 1 through the roof 5.

[0026] The specific working method is as follows: When the supporting structure (column 2 and truss 3) of greenhouse 1 deflects due to thermal deformation or load, the rotating shaft 11 will produce an axial angle deviation. At this time, the protrusion 19 of the shaft and the receiving component 20 will deflect relative to each other. Since the cross-sectional profile of the protrusion 19 of the shaft is a convex curved surface, the contact surface will be automatically adjusted during the deflection, so that the protrusion 19 of the shaft and the receiving component 20 will always maintain surface contact to transmit torque. At the same time, the sliding fit between the protrusion 19 of the shaft and the receiving component 20 will be relatively displaced along the axial direction to compensate for the change in shaft length caused by thermal deformation. Finally, the rack 12 will be driven by the rack and pinion transmission device 15 or the chain transmission device 14, and the rigid end strip 9 of the curtain 8 will be driven by the push-pull rod 13 to realize the opening and closing of the sunshade system.

[0027] The technical means disclosed in this utility model are not limited to those described above, but also include technical solutions composed of equivalent substitutions of the above technical features. Matters not covered in this utility model are common knowledge to those skilled in the art.

Claims

1. A coupling that automatically compensates for axis angle deviation, characterized by, Comprising: a coupling (18) comprising a male part (19) of a shaft and a receiving part (20); the male part (19) of the shaft has a polygonal cross-sectional profile, the receiving part (20) has a circumference around this cross-sectional profile; the male part (19) of the shaft and the receiving part (20) are in a sliding fit, are relatively displaceable in the axial direction to compensate for length changes caused by thermal deformation, the male part (19) of the shaft is provided with a shaft one (16) and a shaft two (17), the shaft one (16) is provided with a rack and pinion gear (15), the shaft two (17) is provided with a chain drive (14).

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