Bolt-sphere joint with bending resistance

Abstract

The utility model relates to a bolt-sphere joint with bending resistance. The bolt-sphere joint comprises a chord member, a bolt sphere and a fixing piece, a cavity is formed in the chord member, a sealing plate is arranged at one end of the chord member, and a through hole is formed in the center of the sealing plate. A limiting piece is further arranged in the cavity. A fixing groove is formed in the side, facing the sealing plate, of the bolt sphere. One end of the fixing piece penetrates through the through hole and is in threaded connection with the interior of the fixing groove. The other end of the fixing piece is fixed to the inner side of the sealing plate and penetrates through the limiting piece. One end of the fixing piece is in threaded connection with the fixing groove of the bolt ball, and the other end of the fixing piece is fixed in the cavity, so that the tensile strength of the chord member can be improved. A limiting piece is arranged in the cavity of the chord member, and the other end of the fixing piece penetrates through the limiting piece. When the chord member is subjected to bending acting force, the chord member is pressed downwards, so that the limiting piece is pressed downwards to be connected to the other end of the fixing piece in an abutting mode, the fixing piece provides supporting force for the chord member, and therefore the bending strength of the bolt-sphere joint is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of space grid structures, in particular to a bolt ball node with anti-bending ability. Background Art

[0002] Grid structures offer advantages such as easy construction, beautiful appearance, flexible structural form, and clear force distribution. This flat or slightly curved spatial truss system, composed of multiple members connected by nodes in a grid pattern, has been widely used in large-span buildings. To reduce the weight of the roof structure and consider economic efficiency, the grid is often larger, and the division of the grid's upper chord determines the spacing of the main purlins. Excessive purlin spacing, i.e., excessive roof panel span, leads to an unreasonable roof panel design. Therefore, grid roofs typically utilize a combination of primary and secondary purlins. Connecting these primary and secondary purlins is a critical and time-consuming task, directly impacting not only the structural load, project quality, and construction safety, but also the construction schedule.

[0003] Research is underway to develop a bolt-and-ball joint connection structure with a certain degree of shear resistance. This is aimed at developing a novel purlin-free bolt-and-ball truss technology solution, enabling the truss upper chord to withstand a certain amount of vertical load. Through rational design, the truss upper chord can also serve as the main roof purlin, simplifying the roof system. Conventional bolt-and-ball joints do not account for the bending moment exerted on the joint by the chord when it bends, only considering the tension and compression of the joint. This results in low bending strength.

[0004] Therefore, it is necessary to provide a bolt-ball joint with bending resistance to solve the above problems. Utility Model Content

[0005] The utility model relates to a bolt ball node with bending resistance. The bolt ball node with bending resistance is connected to a fixing groove of a bolt ball through one end of a fixing member, and the other end of the fixing member is fixed in a cavity, which can improve the tensile strength of the chord. A limiting member is arranged in the cavity of the chord, and the other end of the fixing member is penetrated by the limiting member. When the chord is subjected to a bending force, the chord is pressed downward, so that the limiting member is pressed downward to resist the other end connected to the fixing member. The fixing member provides a supporting force for the chord, thereby improving the bending strength of the bolt ball node, and solving the problem in the prior art that the bolt ball node only considers the tensile force of the chord, resulting in low bending strength.

[0006] To solve the above problems, the present invention provides a bolt-ball joint with bending resistance, comprising:

[0007] A chord rod, wherein a chamber is provided inside the chord rod, a sealing plate is provided at one end of the chord rod, a through hole is provided at the center of the sealing plate; a limit member is also provided in the chamber;

[0008] a bolt ball, the bolt ball being arranged on the outer side of the sealing plate, and a fixing groove being arranged on the side of the bolt ball facing the sealing plate; and

[0009] A fixing member, one end of the fixing member passes through the through hole and is threadedly connected to the fixing groove; the other end of the fixing member is fixed to the inner side of the sealing plate and passes through the limiting member; when the chord is subjected to bending force, the other end of the fixing member is in contact with the limiting member.

[0010] Furthermore, the fixing member comprises a steel rod and a bolt. The bolt is threadedly connected to the sealing plate and the bolt ball. The bolt nut is located inside the sealing plate. One end of the steel rod is welded to the nut, and the other end of the steel rod passes through the stopper. This provides a simple structure and convenient installation and disassembly. Furthermore, the various components of the bolt-ball joint can be machined separately and pre-fabricated, eliminating the need for on-site welding and enabling rapid installation.

[0011] Furthermore, a gap is provided between the limiting member and the outer circumference of the steel rod, and the gap is used for buffering, thereby extending the service life and stability of the structure.

[0012] Furthermore, the limiting member is configured as an annular steel disc structure, and the limiting member is provided with an inner hole, the diameter of the inner hole is larger than the diameter of the steel rod, and the structure is simple and the processing is convenient.

[0013] Furthermore, the length of the steel rod is greater than the distance between the limiter and the inner side of the sealing plate, ensuring that after the bolt and the bolt ball are installed, the end of the steel rod is always located in the limiter, ensuring that the steel rod can support the chord.

[0014] Furthermore, the central axis of the steel rod is arranged to be the same as the central axis of the bolt, thereby improving the strength of the connection and making the structure more compact.

[0015] Furthermore, the bending-resistant bolt-ball node also includes a sleeve and a fixing pin. The bolt is provided with a deep groove along its length, and the sleeve is provided with a pin hole. The sleeve is sleeved around the outer circumference of the bolt and is located between the bolt ball and the sealing plate. One end of the fixing pin passes through the pin hole and is fixed to the deep groove, making it easy to observe whether the bolt is screwed in place and preventing relative displacement between the bolt and the bolt ball, which could affect the stability of the entire node.

[0016] Furthermore, the bolt is provided with a shallow groove area along its length direction, the shallow groove area is connected to the deep groove area, the groove depth of the shallow groove area is less than the depth of the deep groove area, and the shallow groove area is arranged close to the bolt ball to improve assembly efficiency.

[0017] Furthermore, the limiting member is welded to the inner wall of the chamber, thereby improving processing efficiency and assembly stability.

[0018] Furthermore, the distance from the limiting member to the inner side surface of the sealing plate is greater than the distance from the outer side surface of the sealing plate to the bottom of the fixing groove, thereby improving the bending strength.

[0019] Due to the adoption of the above-mentioned bolt-ball node with bending resistance, the present invention has the following beneficial effects compared with the prior art: the present invention relates to a bolt-ball node with bending resistance, which includes a chord, a bolt ball, and a fixing member. A chamber is provided inside the chord, a sealing plate is provided at one end of the chord, and a through hole is provided at the center of the sealing plate. A limit member is also provided in the chamber. The bolt ball is provided on the outside of the sealing plate, and a fixing groove is provided on the side of the bolt ball facing the sealing plate. One end of the fixing member passes through the through hole and is threadedly connected to the fixing groove. The other end of the fixing member is fixed to the inside of the sealing plate and passes through the limit member. When the chord is subjected to a bending force, the other end of the fixing member contacts and connects with the limit member. One end of the fixing member is threadedly connected to the fixing groove of the bolt ball, and the other end of the fixing member is fixed in the chamber, which can improve the tensile strength of the chord. A limit member is provided in the chamber of the chord, and the other end of the fixing member passes through the limit member. When the chord is subjected to a bending force, the chord is pressed downward, causing the limit member to be pressed downward to resist the other end connected to the fixing member. The fixing member provides support force for the chord, thereby improving the bending strength of the bolt ball node, solving the problem of low bending strength caused by the bolt ball node in the prior art that only the tensile force of the chord is considered. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. The drawings described below are only drawings corresponding to some embodiments of the present invention.

[0021] Figure 1 This is a schematic diagram of the exploded structure of an embodiment of the bolt-ball joint with bending resistance of the present invention.

[0022] Figure 2 It is a schematic cross-sectional structural diagram of an embodiment of a bolt-ball joint with bending resistance of the present invention.

[0023] Figure 3 It is a schematic cross-sectional structural diagram of an embodiment of a fixing member of a bolt-ball joint with bending resistance of the present invention.

[0024] Figure 4 The cross-sectional structure diagram of an embodiment of the chord of the bolt-ball joint with bending resistance of the present invention is shown.

[0025] Figure 5 It is a structural schematic diagram of an embodiment of a limiter of a bolt-ball joint with bending resistance according to the present invention.

[0026] In the figure: 1. Bolt-ball node with bending resistance; 2. Chord; 21. Chamber; 3. Bolt ball; 31. Fixing groove; 4. Fixing piece; 41. Steel rod; 42. Bolt; 43. Deep groove area; 44. Shallow groove area; 5. Closing plate; 51. Through hole; 6. Limiting piece; 7. Sleeve; 71. Pin hole; 8. Fixing pin. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0028] Directional terms mentioned in this invention, such as "upper", "lower", "front", "back", "left", "right", "inside", "outside", "side", "top" and "bottom", are only used with reference to the directions of the drawings. The directional terms used are used to illustrate and understand the invention, and are not intended to limit the invention.

[0029] In the figures, structurally similar elements are denoted by the same reference numerals.

[0030] Please refer to Figure 1 、 Figure 2 、 Figure 3 In this embodiment, the bolt ball node 1 with bending resistance includes a chord 2, a bolt ball 3 and a fixing part 4. A chamber 21 is provided inside the chord 2, a sealing plate 5 is provided at one end of the chord 2, and a through hole 51 is provided at the center of the sealing plate 5. A limiting part 6 is also provided in the chamber 21. The bolt ball 3 is provided on the outside of the sealing plate 5, and a fixing groove 31 is provided on the side of the bolt ball 3 facing the sealing plate 5. One end of the fixing part 4 passes through the through hole 51 and is threadedly connected to the fixing groove 31. The other end of the fixing part 4 is fixed to the inner side of the sealing plate 5 and passes through the limiting part 6. When the chord 2 is subjected to the bending force, the other end of the fixing part 4 is in contact with the limiting part 6.

[0031] One end of the fixing member 4 is threaded into the fixing groove 31 of the bolt ball 3, while the other end of the fixing member 4 is fixed within the chamber 21, thereby increasing the tensile strength of the chord 2. A limiter 6 is positioned within the chamber 21 of the chord 2, and the other end of the fixing member 4 penetrates the limiter 6. When the chord 2 is subjected to a bending force, the chord 2 is pressed downward, causing the limiter 6 to press against the other end of the fixing member 4. The fixing member 4 provides support for the chord 2, thereby increasing the bending strength of the bolt-ball joint.

[0032] In this embodiment, please refer to Figure 2 、 Figure 3 、 Figure 4 The fixing member 4 comprises a steel rod 41 and a bolt 42. The bolt 42 is threadedly connected to the sealing plate 5 and the bolt ball 3. The nut of the bolt 42 is located inside the sealing plate 5 and is in close contact with the inner wall of the sealing plate 5. One end of the steel rod 41 is welded to the nut, and the other end of the steel rod 41 is inserted through the stopper 6. This simple structure allows for easy installation and disassembly. Moreover, the various components of the bolt ball joint can be machined separately and can be pre-fabricated, eliminating the need for on-site welding and enabling quick installation.

[0033] A gap is provided between the limiting member 6 and the outer circumference of the steel rod 41 , and the gap is used for buffering to prevent the chord rod 2 from continuously pressing the steel rod 41 , thereby extending the service life and stability of the structure.

[0034] The limiting member 6 is welded to the inner wall of the chamber 21 to improve processing efficiency and assembly stability.

[0035] For details, please refer to Figure 2 、 Figure 5 The stopper 6 is configured as an annular steel disc structure, the outer circumference of which is welded to the inner wall of the chamber 21. The stopper 6 is provided with an inner hole, the diameter of which is larger than the diameter of the steel rod 41, and has a simple structure, convenient processing and low cost.

[0036] Please refer to the preferred Figure 2 The length of the steel rod 41 is greater than the distance between the limiter 6 and the inner side of the sealing plate 5, ensuring that after the bolt 42 and the bolt ball 3 are installed, the end of the steel rod 41 is always located in the limiter 6, ensuring that the steel rod 41 can support the chord 2.

[0037] The central axis of the steel rod 41 is arranged to be the same as the central axis of the bolt 42, which can increase the connection area, thereby improving the strength of the connection and making the structure more compact.

[0038] The distance between the stopper 6 and the inner side of the sealing plate 5 is greater than the distance between the outer side of the sealing plate 5 and the bottom of the fixing groove 31, thereby improving the bending strength. Specifically, the connection between the nut and the sealing plate 5 serves as the support point, and the length between the steel rod 41 and the support point of the stopper 6 and the inner side of the sealing plate 5 is greater than the length of the bolt 42 exposed outside the sealing plate 5.

[0039] In this embodiment, please refer to Figure 1 、 Figure 2 The bending-resistant bolt-ball joint 1 also includes a sleeve 7 and a fixing pin 8. The bolt 42 is provided with a deep groove 43 along its length, and the sleeve 7 is provided with a pin hole 71. The sleeve 7 is fitted around the outer periphery of the bolt 42 and positioned between the bolt ball 3 and the sealing plate 5. One end of the fixing pin 8 passes through the pin hole 71 and is fixed to the deep groove 43, making it easy to observe whether the bolt 42 is screwed into place and preventing relative displacement between the bolt 42 and the bolt ball 3, which could affect the stability of the entire joint.

[0040] Moreover, the bolt 42 is provided with a shallow groove area 44 along its length direction. The shallow groove area 44 is connected to the deep groove area 43. The groove depth of the shallow groove area 44 is less than the depth of the deep groove area 43, and the shallow groove area 44 is arranged close to the bolt ball 3 to improve the assembly efficiency.

[0041] The inner side of the sealing plate 5 is provided with a thread, and the thread on the bolt 42 is a full thread form. First, the bolt 42 is unscrewed from the sealing plate 5, and then the bolt 42 is screwed into the fixing groove 31 of the bolt ball 3 through the sleeve 7.

[0042] During prefabrication, high-strength bolts 42 are first welded to steel rods 41. Stoppers 6 are then welded to the inner wall of cavity 21 of chord member 2. Steel rods 41 are inserted into cavity 21 and through stoppers 6. Bolts 42 are then screwed into sealing plate 5, sealing the end of chord member 2. The unscrewed portion of bolts 42 is left at least the length required for bolts 42 to be screwed into bolt ball 3 (i.e., the depth of fixing groove 31). Then, sealing plate 5 is welded to chord member 2.

[0043] When screwing bolt 42 into bolt ball 3, sleeve 7 may contact the surface of bolt ball 3, but fixing pin 8 may not yet reach the bottom of fixing groove 31. In this case, fixing pin 8 needs to be removed, sleeve 7 should be slid toward chord 2, fixing pin 8 should be inserted, and sleeve 7 should be tightened to screw bolt 42 into bolt ball 3. Repeat this step until fixing pin 8 reaches the bottom of deep groove 43, ensuring that steel rod 41 extends a certain distance beyond stopper 6.

[0044] This bending-resistant bolt-ball joint 1 strengthens the connection between the cover plate 5 and the bolt 42. It can also share the tension or compression of the threaded connection between the bolt 42 and the bolt ball 3 under tension or compression. The steel rod 41 and the stopper 6 enhance the joint's bending resistance. Furthermore, the various components of the bolt-ball joint can be machined separately, eliminating the need for on-site welding and enabling rapid installation. Finally, applying this bolt-ball joint to a purlinless bolt-ball truss can reduce the number of main purlins, thereby reducing weight and steel usage.

[0045] In this embodiment, the utility model relates to a bolt ball node with bending resistance, which includes a chord, a bolt ball and a fixing member. A chamber is provided inside the chord, a sealing plate is provided at one end of the chord, and a through hole is provided at the center of the sealing plate. A limiting member is also provided in the chamber. The bolt ball is provided on the outside of the sealing plate, and a fixing groove is provided on the side of the bolt ball facing the sealing plate. One end of the fixing member passes through the through hole and is threadedly connected to the fixing groove. The other end of the fixing member is fixed to the inner side of the sealing plate and passes through the limiting member. When the chord is subjected to a bending force, the other end of the fixing member is connected to the limiting member. One end of the fixing member is threadedly connected to the fixing groove of the bolt ball, and the other end of the fixing member is fixed in the chamber, which can improve the tensile strength of the chord. A limiting member is provided in the chamber of the chord, and the other end of the fixing member passes through the limiting member. When the chord is subjected to a bending force, the chord is pressed downward, causing the limit member to be pressed downward to resist the other end connected to the fixing member. The fixing member provides support force for the chord, thereby improving the bending strength of the bolt ball node, solving the problem of low bending strength caused by the bolt ball node in the prior art that only the tensile force of the chord is considered.

[0046] In summary, although the present invention has been disclosed above with reference to preferred embodiments, the above preferred embodiments are not intended to limit the present invention. A person skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined by the claims.

Claims

1. A bolt-ball joint with bending resistance, characterized in that: include: A chord rod, wherein a chamber is provided inside the chord rod, a sealing plate is provided at one end of the chord rod, a through hole is provided at the center of the sealing plate; a limit member is also provided in the chamber; a bolt ball, the bolt ball being arranged on the outer side of the sealing plate, and a fixing groove being arranged on the side of the bolt ball facing the sealing plate; and A fixing member, one end of the fixing member passes through the through hole and is threadedly connected to the fixing groove; the other end of the fixing member is fixed to the inner side of the sealing plate and passes through the limiting member; when the chord is subjected to bending force, the other end of the fixing member is in contact with the limiting member.

2. The bolt-ball joint with bending resistance according to claim 1, characterized in that: The fixing part includes a steel rod and a bolt; the bolt is threadedly connected to the sealing plate and the bolt ball, the nut of the bolt is located on the inner side of the sealing plate, one end of the steel rod is welded to the nut, and the other end of the steel rod passes through the limiting part.

3. The bolt-ball joint with bending resistance according to claim 2, characterized in that: A gap is provided between the limiting member and the outer circumference of the steel rod.

4. The bolt-ball joint with bending resistance according to claim 3, characterized in that: The limiting member is configured as an annular steel disc structure, and the limiting member is provided with an inner hole, the diameter of the inner hole being larger than the diameter of the steel rod.

5. The bolt-ball joint with bending resistance according to claim 2, characterized in that: The length of the steel rod is greater than the distance between the limiting member and the inner side surface of the sealing plate.

6. The bolt-ball joint with bending resistance according to claim 2, characterized in that: The central axis of the steel rod is arranged to be the same as the central axis of the bolt.

7. The bolt-ball joint with bending resistance according to claim 2, characterized in that: The bolt ball node with bending resistance also includes a sleeve and a fixing pin; the bolt is provided with a deep groove area along its length direction, and the sleeve is provided with a pin hole; the sleeve is sleeved on the outer peripheral side of the bolt and is located between the bolt ball and the sealing plate; one end of the fixing pin passes through the pin hole and is fixed in the deep groove area.

8. The bolt-ball joint with bending resistance according to claim 7, characterized in that: The bolt is also provided with a shallow groove area along its length direction. The shallow groove area is connected to the deep groove area. The groove depth of the shallow groove area is smaller than the depth of the deep groove area, and the shallow groove area is arranged close to the bolt ball.

9. The bolt-ball joint with bending resistance according to claim 1, characterized in that: The limiting component is welded to the inner wall of the chamber.

10. The bolt-ball joint with bending resistance according to claim 1, characterized in that: The distance from the limiting member to the inner side surface of the sealing plate is greater than the distance from the outer side surface of the sealing plate to the bottom of the fixing groove.

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