Bolt-sphere universal hinge joint without rotation eccentricity

Abstract

The invention relates to a bolt-sphere universal hinge joint without rotation eccentricity. The bolt-sphere universal hinge joint comprises a bolt sphere, the mushroom-head-shaped sleeve comprises a sleeve head and a sleeve column, the sleeve head is a spherical crown body, a hole is formed in the center of the upper side of the sleeve head, the sleeve column is a columnar sleeve with a hole formed in the side face, and the bottom face of the sleeve column is a bowl-shaped arc face. The concave ball sealing plate comprises a sealing plate and a connecting plate, the inner side and the outer side of the sealing plate are partially spherical surfaces, and a hole is formed in the center of the sealing plate. The umbrella head bolt comprises an umbrella-shaped bolt head and a bolt rod, the inner side of the umbrella-shaped bolt head is spherical, threads are engraved on the surface of the bolt rod, and a notch is formed in the middle of the bolt rod. The umbrella head bolt, the concave ball sealing plate and the mushroom-head-shaped sleeve are connected in series, and a bolt rod of the umbrella head bolt sequentially penetrates through a central hole of the concave ball sealing plate and the inner wall of the mushroom-head-shaped sleeve to form a hinged connection assembly. Compared with the prior art, the universal hinge has the advantages that the universal hinge connection characteristics of constraint translation and free rotation are achieved; optimizing a mechanical transmission path; the rotation eccentricity effect is eliminated; the assembly is convenient; the adaptability is wide, and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of structural engineering technology of building engineering technology, and particularly relates to a bolt ball universal hinge joint without rotation eccentricity. BACKGROUND

[0002] In engineering practice, the joint connection state should accurately reproduce the joint mechanical model (hinged, rigid, directional slip, semi-rigid, etc.) used in the structure calculation model. The real connection state (mechanical behavior) of the joint has a great influence on the accuracy of the structure analysis and calculation results and the safety of the structure design and construction products, and is a key component of the structure. In the engineering scenarios such as damper stroke amplification mechanism, three-dimensional link control mechanism, multi-layer net rack and net shell structure, the connection state of "spatial hinge" between the end of the steel rod and the joint is often required. Generally, the spatial ideal hinge joint can be realized by the "universal hinge" element in the field of mechanical engineering. However, there are some problems in directly applying such "universal hinge" components to the field of structural engineering. First, the "universal hinge" structure is delicate, and the processing technology is relatively complex, which leads to economic problems when applied to the field of structural engineering. Secondly, since the carrying capacity of the "universal hinge" is designed for the application scenarios in the field of mechanical engineering, its carrying capacity is generally less than the load level in the field of structural engineering, and it is not suitable for the structural engineering application scenarios with high internal force of the connected rod.

[0003] In the field of structural engineering, the commonly used "spatial hinge" joint is a bolt ball joint. Such a joint is considered to be a connection form that can be equivalent to a "spatial hinge" joint in elastic calculation and analysis. However, in fact, the bolt ball joint has a non-negligible rotational stiffness by constraining the relative linear displacement of the ball joint and the end of the steel rod with the end flat conical head sealing plate, cylindrical sleeve and high-strength bolt assembly, and it is a typical "semi-rigid" joint.

[0004] Specifically, the semi-rigidity of the bolt ball joint is that it cannot achieve "complete release of angular displacement" while meeting "complete constraint of linear displacement". When the structure deformation is large, the end of the rod connected by the traditional bolt ball joint will have an additional bending moment. At the same time, under the condition of large deformation, the bending deformation of the rod caused by the additional bending moment at the end of the rod will be highlighted, which will lead to the fact that the axial forces of the rods sharing the joint are no longer intersecting at a point, which will further aggravate the eccentricity problem and lead to the decline of the overall safety of the structure.

[0005] Therefore, optimizing the configuration of the spatial hinge joint so that it can meet the following requirements at the same time is a problem that needs to be further improved and solved in the field of building structure engineering: 1) easy to process, manufacture, install, 2) accurately achieve the hinge requirement (limit the relative linear displacement of the rod end and release the rotational deformation), and 3) the carrying capacity meets the needs of structural engineering. SUMMARY

[0006] The present application aims at overcoming the defects of the prior art, and provides a universal hinge joint with the characteristics of constrained translation and free rotation, optimized mechanical transmission path, eliminated eccentric effect, convenient assembly and wide adaptability.

[0007] The object of the present application can be achieved by the following technical solutions:

[0008] The present application has four technical features: first, the connection assembly is formed by the mushroom head sleeve, the concave ball sealing plate and the umbrella head bolt in series, which can effectively constrain the relative linear displacement between the connected rod and the bolt ball, completely release the rotation freedom of the rod end around each axis in space, and realize the ideal "universal hinge" connection characteristics; second, the force transmission path is simplified through the new structure design, so that the extension line of the rod axis still passes through the spherical center of the bolt when the rod end rotates and deforms, eliminating the additional bending moment of the rod end and the eccentric bending moment inside the node, and optimizing the overall stress state of the connection assembly; third, the axial force in the connection assembly is transmitted through the surface contact between the sleeve, the sealing plate and the bolt head, which can realize high bearing capacity and meet the design requirements of the structural engineering field; fourth, the elements involved in the new node can be stamped in the factory, without fine machining in the whole process, which is simple and economical.

[0009] The present application provides a bolt ball universal hinge node without rotation eccentricity, comprising:

[0010] The bolt ball is a spherical body processed as a whole, and a plurality of threaded holes are arranged in the bolt ball;

[0011] The mushroom head sleeve comprises a sleeve head and a sleeve column, the sleeve head is a spherical cap body with a hole in the upper center, and the sleeve column is a side hole columnar sleeve with a bowl-shaped arc surface at the bottom;

[0012] The concave ball sealing plate comprises a sealing plate and a connecting plate, the inner and outer sides of the sealing plate are both part of a spherical surface, and a hole is arranged at the center position;

[0013] The umbrella head bolt comprises an umbrella-shaped bolt head and a bolt rod, the inner side of the umbrella-shaped bolt head is spherical, the surface of the bolt rod is provided with threads, and a slot is arranged at the middle part;

[0014] The fastening screw is arranged in the slot of the bolt rod and the mushroom head sleeve;

[0015] The umbrella head bolt, the concave ball sealing plate and the mushroom head sleeve are connected in series, the bolt rod of the umbrella head bolt passes through the center hole of the concave ball sealing plate and the inner wall of the mushroom head sleeve in sequence, and is locked by the fastening screw to form a hinged connection assembly, the concave ball sealing plate and the umbrella head bolt realize free rotation, and the concave ball sealing plate and the mushroom head sleeve realize free rotation.

[0016] Further, the umbrella head bolt inner side is in shape with the concave ball sealing plate outer side, the concave ball sealing plate outer side is larger than the umbrella head bolt inner side, and the central opening area of the concave ball sealing plate is larger than the bolt rod section area.

[0017] Further, the sleeve head upper side is in shape with the concave ball sealing plate inner side, and the concave ball sealing plate inner side is larger than the sleeve head upper side section area.

[0018] Further, the bolt rod is in size with the mushroom head type sleeve inner wall.

[0019] Further, the connecting plate of the concave ball sealing plate outer side is welded with the connecting rod.

[0020] Further, the connecting plate outer circle is provided with an opening to form a flange plate, and is bolted with the connecting rod.

[0021] Further, the sleeve column bottom is in shape with the bolt spherical surface, and can realize close contact.

[0022] Further, the thread of the umbrella head bolt is in shape with the internal thread of the bolt ball, and can be tightly connected through the thread.

[0023] Further, the sealing plate is a spherical cap plate shell structure, and the connecting plate is a ring plate shell structure.

[0024] Further, the sleeve head and the sleeve column are connected through a circular table.

[0025] All contact surfaces are polished and polished, and are coated with lubricating oil to reduce the friction between the plates.

[0026] The assembly method of the bolt ball universal hinge node is as follows:

[0027] S1: the umbrella head bolt is sequentially threaded through the central opening of the concave ball sealing plate, the inner wall of the mushroom head type sleeve, and the series connection of the umbrella head bolt, the concave ball sealing plate and the mushroom head type sleeve is completed.

[0028] S2: tighten the fastening screw placed in the umbrella head bolt slot and the sleeve column side opening position, so that the umbrella head bolt, the concave ball sealing plate and the mushroom head type sleeve form a hinged connection assembly.

[0029] S3: place the hinged connection assembly of S2 step in the bolt ball corresponding hole, and rotate the umbrella head bolt to make it deeply into the bolt ball, realize the close connection between the bolt ball and the end of the hinged connection assembly, and form the bolt ball node domain.

[0030] S4: the connecting rod end is fastened and connected with the connecting plate of the concave ball sealing plate by welding / flange plate bolt connection, realizing the universal hinge connection of the structure.

[0031] Compared with the prior art, the present application has the following advantages:

[0032] (1) Realize the connection characteristic of the universal hinge with the constraint of translation and the freedom of rotation. The traditional bolt ball joint has the problem of non-zero rotation stiffness, while the three-component series structure of the application effectively constrains the axial linear displacement of the end of the rod and completely releases the rotation freedom around each axis in space. The rod can freely rotate around the spherical center of the bolt. By adopting the form of the concave spherical sealing plate and the mushroom head sleeve and connecting them in series with the ball head screw rod, the joint of the application effectively constrains the axial linear displacement of the end of the rod and completely releases the rotation freedom around each axis in space, realizing the ideal connection characteristic of the universal hinge.

[0033] (2) Optimize the mechanical transmission path. On the one hand, when the rod is in tension, the force transmission path is: tension force → concave spherical sealing plate → umbrella head bolt → bolt ball, and the effective transmission of tension force can be realized through the umbrella head bolt; on the other hand, when the rod is in compression, the force transmission path is: compression force → concave spherical sealing plate → mushroom head sleeve → bolt ball, and the sleeve optimizes the stress angle of the rod and the bolt ball at the same time, reducing the local stress concentration of the joint.

[0034] (3) Eliminate the eccentric effect of rotation. In the new joint, the spherical connection surfaces share the same spherical center, so that the intersection of the rod axes still intersects at the spherical center when the rod angle changes greatly under the working conditions such as earthquakes, eliminating the additional bending moment under large deformation, thereby improving the bearing capacity of the system.

[0035] (4) Easy to assemble and wide adaptability. The joint is based on the widely used bolt ball joint technology, takes the spherical joint as the core, and connects the rod and the ball through high-strength bolts, which is convenient for construction and flexible for assembly, greatly reducing the construction complexity and design and processing difficulty of the multi-rod gathering joint. The connecting plate of the concave spherical sealing plate can be directly welded with the rod end or can be expanded into a flange connecting plate to realize connection with the rod end through bolts. Therefore, the new bolt ball universal hinge joint is not only suitable for traditional space grid structures, but also suitable for space three-dimensional damper stroke amplification devices, and has wide applicability. BRIEF DESCRIPTION OF DRAWINGS

[0036] Fig. 1 Figure 1 is a structural schematic diagram and a partial cross-sectional view of a bolt ball universal hinge joint without eccentric rotation;

[0037] Fig. 2 Figure 2 is a structural schematic diagram and a partial cross-sectional view of a mushroom head sleeve;

[0038] Fig. 3 Figure 3 is a structural schematic diagram and a partial cross-sectional view of a concave spherical sealing plate (the left side is a concave spherical sealing plate without a flange plate in Example 1, and the right side is a concave spherical sealing plate with a flange plate in Example 2);

[0039] Fig. 4 Figure 4 is a structural schematic diagram and a partial cross-sectional view of an umbrella head bolt.

[0040] Fig. 5 Figure 1 is a schematic diagram of umbrella head bolt, concave ball sealing plate, mushroom head type sleeve and fastening screw combination installation;

[0041] Fig. 6 Figure 2 is a schematic diagram of umbrella head bolt-concave ball sealing plate-mushroom head type sleeve forming a hinged connection assembly and bolt ball combination installation.

[0042] Figure 1 is a schematic diagram of umbrella head bolt, concave ball sealing plate, mushroom head type sleeve and fastening screw combination installation; Figure 2 is a schematic diagram of umbrella head bolt-concave ball sealing plate-mushroom head type sleeve forming a hinged connection assembly and bolt ball combination installation. Figure 3 is a schematic diagram of the bolt ball; Figure 4 is a schematic diagram of the mushroom head type sleeve; Figure 5 is a schematic diagram of the concave ball sealing plate; Figure 6 is a schematic diagram of the umbrella head bolt; Figure 7 is a schematic diagram of the fastening screw; Figure 8 is a schematic diagram of the bolt ball; Figure 9 is a schematic diagram of the mushroom head type sleeve; Figure 10 is a schematic diagram of the concave ball sealing plate; Figure 11 is a schematic diagram of the umbrella head bolt; Figure 12 is a schematic diagram of the fastening screw; 1-bolt ball; 2-mushroom head type sleeve; 3-concave ball sealing plate; 4-umbrella head bolt; 5-connection rod; 6-fastening screw; 21-sleeve head; 22-sleeve column; 31-sealing plate; 32-connection plate; 33-flange plate; 41-umbrella bolt head; 42-bolt rod. DETAILED DESCRIPTION

[0043] The present application will be described in detail below with reference to the accompanying drawings and specific embodiments. If the components, material names, connection structures, control methods, algorithms, etc. in the technical solution are not explicitly stated, they are considered as common technical features disclosed in the prior art.

[0044] Example 1

[0045] The present embodiment provides a bolt ball universal hinge joint without rotating eccentricity, as shown in Figure 1, which comprises: Figs. 1-6

[0046] The bolt ball 1 is a spherical body processed as a whole, and a plurality of threaded holes are arranged in the bolt ball 1;

[0047] The mushroom head type sleeve 2 comprises a sleeve head 21 and a sleeve column 22, the sleeve head 21 is a spherical cap body with a hole in the center of the upper side, and the sleeve column 22 is a side hole columnar sleeve with a bowl-shaped arc surface at the bottom;

[0048] The concave ball sealing plate 3 comprises a sealing plate 31 and a connection plate 32, the inner and outer sides of the sealing plate are both partial spherical surfaces, and a hole is arranged at the center position;

[0049] The umbrella head bolt 4 comprises an umbrella bolt head 41 and a bolt rod 42, the inner side of the umbrella bolt head 41 is spherical, and the surface of the bolt rod 42 is provided with threads and a slot in the middle;

[0050] The fastening screw 6 is arranged in the slot of the bolt rod 42 and the mushroom head type sleeve 2;

[0051] The umbrella head bolt 4, the concave ball sealing plate 3, and the mushroom head type sleeve 2 are connected in series, the bolt rod 42 of the umbrella head bolt 4 passes through the center hole of the concave ball sealing plate 3 and the inner wall of the mushroom head type sleeve 2 in turn, and is locked by the fastening screw 6 to form a hinged connection assembly, the concave ball sealing plate 3 and the umbrella head bolt 4 are free to rotate, and the concave ball sealing plate 3 and the mushroom head type sleeve 2 are free to rotate. ​

[0052] In the specific embodiment, the inner side of the umbrella head bolt 4 is shaped to match the outer side of the concave spherical sealing plate 3, the outer side of the concave spherical sealing plate 3 is larger than the inner side of the umbrella head bolt 4, and the central opening area of the concave spherical sealing plate 3 is larger than the cross-sectional area of the bolt shaft 42.

[0053] In the specific embodiment, the upper side of the sleeve head 21 is shaped to match the inner side of the concave spherical sealing plate 3, and the inner side of the concave spherical sealing plate 3 has a larger cross-sectional area than the upper side of the sleeve head 21.

[0054] In the specific embodiment, the bolt shaft 42 is the same size as the inner wall of the mushroom head sleeve 2.

[0055] In the specific embodiment, the connecting plate 32 on the outer side of the concave spherical sealing plate 3 is welded to the connecting rod 5.

[0056] In the specific embodiment, the bottom of the sleeve column 22 is shaped to match the surface of the bolt ball 1, allowing close contact.

[0057] In the specific embodiment, the threads of the umbrella head bolt 4 match the internal threads of the bolt ball 1, allowing tight connection through threads.

[0058] In the specific embodiment, the sealing plate 31 is a spherical cap-shaped shell structure, and the connecting plate 32 is a ring-shaped shell structure.

[0059] In the specific embodiment, the sleeve head 21 is connected to the sleeve column 22 through a circular truncated cone.

[0060] All contact surfaces are polished and polished, and lubricating oil is applied to reduce friction between the plates.

[0061] The assembly method of the bolt ball universal hinge node is as follows:

[0062] S1: The umbrella head bolt 4 is sequentially inserted through the central opening of the concave spherical sealing plate 3 and the inner wall of the mushroom head sleeve 2, completing the series connection of the umbrella head bolt 4, the concave spherical sealing plate 3, and the mushroom head sleeve 2.

[0063] S2: Tighten the fastening screw 6 placed in the slot of the umbrella head bolt 4 and the side opening position of the sleeve column 22, so that the umbrella head bolt 4, the concave spherical sealing plate 3, and the mushroom head sleeve 2 form a hinged connection assembly.

[0064] S3: Place the hinged connection assembly of step S2 in the corresponding hole position of the bolt ball 1, and rotate the umbrella head bolt 4 to make it penetrate into the interior of the bolt ball 1, realizing the tight connection of the bolt ball 1 and the end of the hinged connection assembly, forming a bolt ball node domain.

[0065] S4: The end of the connecting rod 5 is connected to the connecting plate 32 of the concave spherical sealing plate 3 through welding / flange plate bolt connection, realizing the tight connection of the structure and the universal hinge connection.

[0066] Embodiment 2

[0067] The embodiment provides a bolt ball universal hinge joint without rotating eccentricity, as shown in the drawings, comprising: Figs. 1-6

[0068] The bolt ball 1 is a spherical body processed as a whole, and a plurality of threaded holes are arranged in the bolt ball 1.

[0069] The mushroom head type sleeve 2 comprises a sleeve head 21 and a sleeve column 22, the sleeve head 21 is a spherical cap body with a hole in the upper center, and the sleeve column 22 is a side hole columnar sleeve with a bowl-shaped arc bottom surface.

[0070] The concave spherical sealing plate 3 comprises a sealing plate 31 and a connecting plate 32, the inner and outer sides of the sealing plate are both partial spherical surfaces, and a hole is arranged in the center position.

[0071] The umbrella head bolt 4 comprises an umbrella-shaped bolt head 41 and a bolt rod 42, the inner side of the umbrella-shaped bolt head 41 is spherical, and the surface of the bolt rod 42 is provided with threads and a slot in the middle part.

[0072] The fastening screw 6 is arranged in the slot of the bolt rod 42 and the mushroom head type sleeve 2.

[0073] The umbrella head bolt 4, the concave spherical sealing plate 3 and the mushroom head type sleeve 2 are connected in series, the bolt rod 42 of the umbrella head bolt 4 passes through the center hole of the concave spherical sealing plate 3 and the inner wall of the mushroom head type sleeve 2 in sequence, and is locked by the fastening screw 6, thereby forming a hinge connection assembly, the concave spherical sealing plate 3 and the umbrella head bolt 4 are free to rotate, and the concave spherical sealing plate 3 and the mushroom head type sleeve 2 are free to rotate.

[0074] In the specific embodiment, the inner side of the umbrella head bolt 4 is consistent in shape with the outer side of the concave spherical sealing plate 3, the outer side of the concave spherical sealing plate 3 is larger than the inner side of the umbrella head bolt 4, and the area of the center hole of the concave spherical sealing plate 3 is larger than the cross-sectional area of the bolt rod 42.

[0075] In the specific embodiment, the upper side of the sleeve head 21 is consistent in shape with the inner side of the concave spherical sealing plate 3, and the inner side of the concave spherical sealing plate 3 is larger than the cross-sectional area of the upper side of the sleeve head 21.

[0076] In the specific embodiment, the bolt rod 42 is consistent in size with the inner wall of the mushroom head type sleeve 2.

[0077] In the specific embodiment, the outer ring of the connecting plate 32 is provided with a hole to form a flange plate 33, and is bolted with the connecting rod 5.

[0078] In the specific embodiment, the bottom of the sleeve column 22 is consistent in shape with the surface of the bolt ball 1, and can realize close contact.

[0079] ​In the specific embodiment, the thread of the umbrella head bolt 4 matches the internal thread of the bolt ball 1, and the tight connection can be achieved through the thread.

[0080] In the specific embodiment, the sealing plate 31 is a spherical cap structure, and the connecting plate 32 is a ring-shaped plate shell structure.

[0081] In the specific embodiment, the sleeve head 21 and the sleeve column 22 are connected through a circular truncated cone.

[0082] All contact surfaces are polished and polished, and lubricating oil is applied to reduce the friction between the plates.

[0083] The assembly method of the bolt ball universal hinge joint is as follows:

[0084] S1: The umbrella head bolt 4 is sequentially inserted through the center opening of the concave ball sealing plate 3, the inner wall of the mushroom head sleeve 2, and the tight connection of the umbrella head bolt 4, the concave ball sealing plate 3, and the mushroom head sleeve 2 is completed.

[0085] S2: Tighten the fastening screw 6 placed in the slot of the umbrella head bolt 4 and the side opening position of the sleeve column 22, so that the umbrella head bolt 4, the concave ball sealing plate 3, and the mushroom head sleeve 2 form a hinged connection assembly.

[0086] S3: Place the hinged connection assembly of S2 step in the corresponding hole position of the bolt ball 1, and rotate the umbrella head bolt 4 to make it deep into the interior of the bolt ball 1, realize the tight connection of the bolt ball 1 and the end of the hinged connection assembly, and form the bolt ball joint domain.

[0087] S4: The connecting rod 5 end and the connecting plate 32 of the concave ball sealing plate 3 are fastened and connected by welding / flange plate bolt connection, realizing the universal hinge connection of the structure.

[0088] The components not described in detail in the embodiment are existing components that can be purchased in the public channel.

[0089] The above description of the embodiments is for the convenience of those skilled in the art to understand and use the invention. Those skilled in the art can easily make various modifications to these embodiments, and apply the general principles described herein to other embodiments without creative labor. Therefore, the present application is not limited to the above embodiments, and the improvements and modifications made by those skilled in the art without departing from the scope of the present application should be within the scope of protection of the present application.

Claims

1. A bolt-ball universal joint with no rotational eccentricity, characterized in that, include: Bolt ball (1), with several threaded holes inside the bolt ball (1); Mushroom-shaped sleeve (2) includes a sleeve head (21) and a sleeve column (22). The sleeve head (21) is a spherical crown with a central hole on the upper side. The sleeve column (22) is a columnar sleeve with a hole on the side and a bowl-shaped arc surface on the bottom. The concave spherical sealing plate (3) includes a sealing plate (31) and a connecting plate (32). The inner and outer sides of the sealing plate are partially spherical, and a hole is opened at the center. The umbrella head bolt (4) includes an umbrella-shaped bolt head (41) and a bolt shank (42). The inner side of the umbrella-shaped bolt head (41) is spherical, and the surface of the bolt shank (42) is threaded and has a groove in the middle. Fastening screw (6) is located in the groove between bolt rod (42) and mushroom head sleeve (2); The umbrella head bolt (4), concave ball sealing plate (3), and mushroom head sleeve (2) are connected in series. The bolt shank (42) of the umbrella head bolt (4) passes through the central opening of the concave ball sealing plate (3) and the inner wall of the mushroom head sleeve (2) in sequence, and is locked by fastening screws (6) to form a hinged connection assembly. The concave ball sealing plate (3) and the umbrella head bolt (4) can rotate freely, and the concave ball sealing plate (3) and the mushroom head sleeve (2) can rotate freely.

2. The bolt-ball universal joint with no rotational eccentricity according to claim 1, characterized in that, The inner side of the umbrella head bolt (4) matches the outer side of the concave ball sealing plate (3). The outer side of the concave ball sealing plate (3) is larger than the inner side of the umbrella head bolt (4), and the central opening area of ​​the concave ball sealing plate (3) is larger than the cross-sectional area of ​​the bolt rod (42).

3. A bolt-ball universal joint with no rotational eccentricity according to claim 1, characterized in that, The upper side of the sleeve head (21) matches the shape of the inner side of the concave ball sealing plate (3), and the inner side of the concave ball sealing plate (3) has a larger cross-sectional area than the upper side of the sleeve head (21).

4. A bolt-ball universal joint with no rotational eccentricity according to claim 1, characterized in that, The bolt rod (42) has the same inner wall size as the mushroom head sleeve (2).

5. A bolt-ball universal joint with no rotational eccentricity according to claim 1, characterized in that, The connecting plate (32) on the outside of the concave ball sealing plate (3) is welded to the connecting rod (5).

6. A bolt-ball universal joint with no rotational eccentricity according to claim 1, characterized in that, The outer ring of the connecting plate (32) is provided with an opening to form a flange plate (33), which is bolted to the connecting rod (5).

7. A bolt-ball universal joint with no rotational eccentricity according to claim 1, characterized in that, The bottom of the sleeve column (22) matches the shape of the bolt ball (1), enabling close contact.

8. A bolt-ball universal joint with no rotational eccentricity according to claim 1, characterized in that, The threads of the umbrella head bolt (4) match the internal threads of the bolt ball (1), enabling a tight connection through the threads.

9. A bolt-ball universal joint with no rotational eccentricity according to claim 1, characterized in that, The sealing plate (31) is a spherical crown-shaped shell structure, and the connecting plate (32) is an annular shell structure.

10. A bolt-ball universal joint with no rotational eccentricity according to claim 1, characterized in that, The sleeve head (21) and the sleeve column (22) are connected by a frustum.

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