Central swivel joint for passing through large-diameter cable
By introducing end caps and transition pressure plates into the central rotary joint, the problems of large central rotary shaft size and difficult assembly are solved, achieving cost reduction and ensuring coaxiality, and preventing cable damage.
Patent Information
- Application Number
- CN202423141296.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-19
- Publication Date
- 2025-12-02
- Estimated Expiration
- 2034-12-19
AI Technical Summary
The existing central rotary joint has a large central return shaft, which leads to high cost, increased weight and assembly difficulties.
Design a central rotary joint structure including an end cap, a central return shaft, a central return seat, and a transition pressure plate. By setting a maximum inner hole on the end cap and using chamfers and stops to ensure coaxiality, it can adapt to different cable end outer diameters and reduce the diameter of the central return shaft.
The size and processing difficulty of the return shaft were reduced, manufacturing costs were lowered, coaxiality deviation was resolved, cable damage was prevented, and the assembly process was simplified.
Smart Images
Figure CN223625559U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of rotary joint technology, and in particular to a central rotary joint for large-diameter cables. Background Technology
[0002] Currently, large-scale piling equipment is trending towards integration and electronic control. Because the power unit is electrically driven, the power cable beneath the chassis needs to be routed through a central rotary joint to prevent cable entanglement. Common structural methods include... Figure 1 As mentioned above, because the cable end needs to be connected to the slip ring, the outer diameter of the cable end is larger than the outer diameter of other parts of the cable. This causes the following problems with the existing central rotary joint:
[0003] 1. Since the entire cable needs to be placed inside the central hole of the central swivel joint, the central hole of the central swivel joint must match the maximum outer diameter of the cable. This results in an increase in the overall volume of the central swivel shaft, leading to increased costs.
[0004] 2. The increased overall size and weight of the central rotary joint, coupled with limited space in the diameter direction, makes assembly at the chassis location difficult. Utility Model Content
[0005] This invention addresses the shortcomings of existing technologies by providing a central rotary joint for large-diameter cables that reduces the volume of the central return shaft, lowers processing difficulty, and reduces manufacturing costs.
[0006] To achieve the above objectives, this utility model first proposes a central rotary joint for large-diameter cables, including an end cap, a central return shaft, a central return seat, and a transition pressure plate. One end of the central return seat is axially limited by a shoulder on the outside of the central return shaft, and the other end is axially limited by the transition pressure plate. The end cap is coaxially mounted on the central return shaft via the transition pressure plate. The central return shaft has a first central hole in its center, the transition pressure plate has a second central hole in its center, and the end cap has a third central hole in its center. The first, second, and third central holes are coaxially arranged. The diameter of the third central hole is larger than the diameter of the first central hole. The second central hole is used to connect the first and third central holes. The diameter of the third central hole matches the diameter of the cable end.
[0007] In this embodiment, the end cap and the transition pressure plate are connected by bolts to form a whole.
[0008] In this embodiment, the transition pressure plate is connected to the central return shaft by bolts to form a whole.
[0009] In this embodiment, the first central hole has a first chamfer at the end near the second central hole, and the second central hole has a second chamfer at the end near the third central hole. Both the first and second chamfers are conical. The first chamfer makes the transition between the second central hole and the first central hole smooth, and the second chamfer makes the transition between the third central hole and the second central hole smooth.
[0010] In this embodiment, a lower stop is coaxially provided on one side of the transition pressure plate, and an upper stop matching the lower stop is provided at the end of the return shaft.
[0011] In this embodiment, the other side of the transition pressure plate is provided with a pressure plate upper stop, and the end cover is provided with a lower stop that matches the pressure plate upper stop.
[0012] With the above structure, this utility model has the following advantages:
[0013] 1. This utility model has an end cap on the end where the return shaft connects to the slip ring, so that the largest inner hole of the entire device is located on the end cap, not on the return shaft. In this way, by replacing different models of end caps and transition pressure plates, it can adapt to the outer diameter of different cable ends without increasing the center hole of the return shaft, thus solving the problem of the large size of the existing return shaft.
[0014] 2. The end cap of this utility model is positioned by the lower stop and the upper stop of the transition pressure plate. The transition pressure plate is positioned by the lower stop of the pressure plate and the lower stop on the central return shaft, which can ensure the coaxiality during installation and solve the problem of coaxiality deviation between the electric slip ring and the central return shaft during rotation.
[0015] 3. This utility model achieves a smooth transition between the second center hole and the first center hole through the first chamfer on the return shaft, and a smooth transition between the third center hole and the second center hole through the second chamfer on the transition pressure plate. The setting of the first chamfer and the second chamfer facilitates the cable insertion and prevents damage to the cable from sharp hole edges during installation or maintenance.
[0016] In summary, this device solves the problem of excessively large outer diameter of the return shaft, which occupies limited chassis space. The reduced diameter of the return shaft in this device lowers the processing difficulty, reduces costs, and effectively saves money. Attached Figure Description
[0017] Figure 1 This is a cross-sectional view of an existing central rotary joint.
[0018] Figure 2 This is a schematic diagram of the structure of this utility model after being connected with an electric slip ring.
[0019] Figure 3 This is a schematic diagram of the structure of this utility model.
[0020] Figure 4 This is a schematic diagram of the end cap structure of this utility model.
[0021] Figure 5 This is a schematic diagram of one side of the transition pressure plate of this utility model.
[0022] Figure 6 This is a schematic diagram of the structure of the other side of the transition pressure plate of this utility model.
[0023] In the attached diagram: 1. Electric slip ring; 2. Transition pressure plate; 21. Second center hole; 22. Second chamfer; 23. Upper stop of pressure plate; 24. Lower stop of pressure plate; 3. Middle return seat; 4. Middle return shaft; 41. First center hole; 42. First chamfer; 5. Cable; 6. End cap; 61. Third center hole. Detailed Implementation
[0024] 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.
[0025] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.
[0026] like Figures 2 to 6As shown, a central rotary joint for large-diameter cables includes an end cap 6, a central return shaft 4, a central return seat 3, and a transition pressure plate 2. The central return seat 3 is coaxially fitted onto the outside of the central return shaft 4, and the central return seat 3 and the central return shaft 4 are rotatably assembled. One end of the central return shaft 4 is sequentially and coaxially mounted with the transition pressure plate 2 and the end cap 6. One end of the central return seat 3 is axially limited by a shoulder on the outside of the central return shaft 4, and the other end is axially limited by the transition pressure plate 2. The central return shaft 4 has a first central hole 41 in its middle for threading a cable 5. The transition pressure plate 2 has a second central hole 21 in its middle, coaxially arranged with the first central hole 41. The end cap 6 has a central hole coaxial with the first central hole 41 in its middle. A third central hole 61 is provided, the diameter of which is larger than that of the first central hole 41. The second central hole 21 is used to connect the first central hole 41 and the third central hole 61. The diameter of the third central hole 61 matches the diameter of the cable 5 end. The diameter of the first central hole 41 matches the outer diameter of other parts of the cable 5. With the above structure, the largest inner hole of the entire device is located on the end cap 6, rather than on the return shaft 4. In this way, by replacing different models of end caps 6 and transition pressure plates 2, different cable end outer diameters can be accommodated without increasing the size of the central hole of the return shaft 4, thus solving the problem of the large size of the existing return shaft 4.
[0027] Furthermore, the end cap 6 and the transition pressure plate 2 are connected by bolts to form an integral whole, and the transition pressure plate 2 is connected by bolts to the central return shaft 4 to form an integral whole.
[0028] like Figure 3 As shown, the first center hole 41 has a first chamfer 42 at the end near the second center hole 21, and the second center hole 21 has a second chamfer 22 at the end near the third center hole 61. Both the first chamfer 42 and the second chamfer 22 are conical. The first chamfer 42 makes the transition between the second center hole 21 and the first center hole 41 smooth, and the second chamfer 22 makes the transition between the third center hole 61 and the second center hole 21 smooth. The setting of the first chamfer 42 and the second chamfer 22 facilitates the insertion of cables and prevents damage to cables from sharp hole edges during installation or maintenance.
[0029] like Figure 4 , 5 As shown in Figure 6, the transition pressure plate 2 has a lower stop 24 coaxially arranged on one side and an upper stop 23 coaxially arranged on the other side. The end of the return shaft 4 has an upper stop matching the lower stop 24, and the end cover 6 has a lower stop matching the upper stop 23. The end cover 6 is positioned by the lower stop and the upper stop 23 of the transition pressure plate 2, and the lower stop 24 of the transition pressure plate 2 is positioned by the lower stop and the lower stop on the return shaft 4, which can ensure the coaxiality during installation and solve the problem of coaxiality deviation between the electric slip ring 1 and the return shaft 4 during rotation.
[0030] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the concept of this utility model and the contents of the specification and drawings of this utility model, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.
Claims
1. A central rotary joint for large-diameter cables, comprising an end cap (6), a central return shaft (4), a central return seat (3), and a transition pressure plate (2), wherein one end of the central return seat (3) is axially limited by a shoulder on the outside of the central return shaft (4), and the other end is axially limited by the transition pressure plate (2), characterized in that: The end cap (6) is coaxially mounted on the return shaft (4) via a transition pressure plate (2). The return shaft (4) has a first center hole (41) in the middle, the transition pressure plate (2) has a second center hole (21) in the middle, and the end cap (6) has a third center hole (61) in the middle. The first center hole (41), the second center hole (21), and the third center hole (61) are arranged coaxially. The diameter of the third center hole (61) is larger than the diameter of the first center hole (41). The second center hole (21) is used to connect the first center hole (41) and the third center hole (61). The diameter of the third center hole (61) matches the diameter of the cable (5) end.
2. The central rotary joint for large-diameter cables according to claim 1, characterized in that: The end cap (6) and the transition pressure plate (2) are connected by bolts to form an integral whole.
3. The central rotary joint for large-diameter cables according to claim 1, characterized in that: The transition pressure plate (2) is connected to the central return shaft (4) by bolts to form a whole.
4. The central rotary joint for large-diameter cables according to claim 1, characterized in that: The first center hole (41) has a first chamfer (42) at one end near the second center hole (21), and the second center hole (21) has a second chamfer (22) at one end near the third center hole (61). Both the first chamfer (42) and the second chamfer (22) are conical. The first chamfer (42) makes the transition between the second center hole (21) and the first center hole (41) smooth, and the second chamfer (22) makes the transition between the third center hole (61) and the second center hole (21) smooth.
5. The central rotary joint for large-diameter cables according to claim 1, characterized in that: The transition pressure plate (2) is provided with a lower pressure plate stop (24) on one side, and the end of the middle return shaft (4) is provided with an upper stop that matches the lower pressure plate stop (24).
6. The central rotary joint for large-diameter cables according to claim 5, characterized in that: The transition pressure plate (2) is coaxially provided with an upper stop (23) on the other side, and the end cover (6) is provided with a lower stop that matches the upper stop (23).