Two-shaft pipe fitting closed type rotating suite and frame connecting piece of two-shaft pipe fitting closed type rotating suite

Abstract

The utility model provides a two-shaft pipe fitting closed type rotating suite and relates to the technical field of rigid pipe fitting connection, the structure of the two-shaft pipe fitting closed type rotating suite is improved, vibration between two sets of components on the rotating suite during work is greatly reduced, a dustproof structure is arranged on a connecting piece, and therefore the rotating suite can be prevented from being damaged. Impurities and chippings are prevented from entering the connecting part of the two components, the contact part is protected, and the service life is prolonged; meanwhile, the utility model further provides a frame connecting piece assembled by using the rotating suite, rapid assembly and disassembly are achieved, enough strength and stability are guaranteed, and wide application prospects are provided. Through the innovative design of the rotating suite, the problems that in traditional pipe fitting connection, loosening and abrasion are prone to occurring, and angle adjustment is limited are solved, and meanwhile a modularized and high-strength supporting system is achieved through the frame structure unit. The method is suitable for the fields of building, industry, traffic and the like, and has remarkable economic benefits and engineering application values.

Description

Technical Field

[0001] This utility model relates to the field of rigid pipe fitting connection technology, specifically to a two-axis pipe fitting closed rotating kit and its frame connector. Background Technology

[0002] Pipe support swivel couplers are pipe fitting components used to connect pipes. They are mainly used in pipe support structures in fields such as construction, industrial equipment, and transportation engineering. Their core function is to allow pipes to rotate flexibly or adjust their angle at the connection point, thereby enhancing the adaptability and stability of the structure. They have good flexibility, can be adjusted to any angle to adapt to complex structural requirements, and possess high strength and durability. They are made of high-quality steel and rust-proofed, with a service life of 8-10 years. They adopt a modular design, are easy to install, reduce construction time, and lower labor costs.

[0003] The current application status and existing problems of swivel fasteners for pipe supports.

[0004] In construction engineering, swivel couplers are mainly used in scaffolding erection and formwork support systems, such as multi-angle connections between uprights and horizontal bars. Especially in complex terrain or structures, they can achieve flexible large-angle turns, improving construction efficiency. In the field of general industrial equipment, swivel couplers are mainly used for fixing pipe fittings in automated production lines and assembly lines, meeting the needs of high-precision mechanical connections. In addition, swivel couplers are also widely used in transportation infrastructure construction, in railway, bridge, wind power and photovoltaic projects, for stable connections supporting structures. In some agricultural production scenarios, they are also used to build adjustable-angle plant supports, etc.

[0005] The market size of swivel fasteners is worth tens of billions of yuan and is expected to continue to grow in the future, especially with significant growth in demand from the industrial sector. The application of new materials such as high-strength alloy steel and stainless steel has also improved product durability. Even so, current swivel fasteners still have some problems:

[0006] Firstly, there are structural defects. Rotary fasteners need to withstand large alternating loads during use. In particular, existing rotary fasteners basically include more than 10 parts, such as rotating seats, fixed cover plates, rivets, fixing bolts, nuts, washers, positioning devices, and adjustment devices. The large number of parts and complex assembly make it easy for the fixed cover plates and fixing bolts to loosen under high-frequency vibration.

[0007] In addition, the two rotating seats are connected by rivets, but there are gaps between the rotating seats or between the rivets and the rotating seats, which can easily allow dust to enter, causing fatigue spalling at the contact points, resulting in spalling of the raceway and rolling element surfaces, and causing vibration and noise.

[0008] Therefore, by upgrading technology and optimizing the structure, the safety and reliability of swivel fasteners can be further improved, meeting the diverse needs of engineering construction. Summary of the Invention

[0009] To address the aforementioned issues, this invention provides a closed-loop rotary assembly for two-axis tubular components. By improving the structure of this assembly, vibration between the two sets of components during operation is significantly reduced. Furthermore, a dustproof structure is incorporated into the connector to prevent impurities and debris from entering the connection points between the two sets of components, protecting the contact areas and extending their lifespan. Additionally, a frame connector assembled using the aforementioned rotary assembly is provided, enabling rapid assembly and disassembly, ensuring sufficient strength and stability, and offering broad application prospects.

[0010] One of the objectives of this application is to adopt the following technical solution:

[0011] A closed-loop rotating assembly for a two-axis tubular fitting, characterized in that the assembly has a dual-axis linkage structure and includes a left sleeve assembly 2 and a right sleeve assembly 3 connected together by an intermediate connector 1.

[0012] The main body of the left sleeve assembly 2 is a cylindrical hollow sleeve a2-1. A locking screw hole a2-2 is provided on its outer circumferential surface. This locking screw hole a2-2 is formed by a hollow frustum with a height equal to 1 / 5 of the diameter of the hollow sleeve a2-1, perpendicularly intersecting the outer shell of the hollow sleeve a2-1. The ratio of the upper and lower base radii of the frustum is 1:2. Threads are formed on its inner wall to mate with locking screws. The axis of the hollow portion inside the hollow frustum is in the same plane as the axis of the hollow sleeve a2-1 and intersects perpendicularly. On the other side of the outer circumferential surface of the cylindrical hollow sleeve a2-1, at a location coinciding with the axis of the frustum, a connecting section a2-3 is provided. This connecting section a2-3 is entirely cylindrical with a diameter equal to that of the cylindrical hollow sleeve a2-1. The two parts intersect perpendicularly; a three-step connecting hole a2-4 is provided at the center of the connecting section a2-3, the connecting hole a2-4 is connected to the inner wall of the cylindrical hollow sleeve a2-1, and the first step part, the second step part, and the third step part of the connecting hole a2-4 are opened sequentially from the inside to the outside on the inner wall surface. The total height of the three step parts is equal to the depth of the entire connecting hole a2-4, and the height ratio of the three step parts is 2:3:3, and the diameter ratio of the three step parts is 5:4:3; in addition, a concave annular positioning sliding groove 2-5 with the same center as the connecting hole a2-4 is provided on the outer end face of the connecting section a2-3. The depth of the positioning sliding groove 2-5 is 1 / 2 of the thickness of the entire connecting section a2-3.

[0013] The right sleeve assembly 3 is symmetrical to the left sleeve assembly 2, and also includes a cylindrical hollow sleeve b3-1, a hollow frustum-shaped locking screw hole b3-2, and a connecting section b3-3. The shape, structure, and size of the hollow sleeve b3-1 and the locking screw hole b3-2 are completely consistent with those on the left sleeve assembly 2. The axes of the connecting sections a2-3 and b3-3 are coincident, and they can rotate at any angle around the coincident axis. The contact surface between the right sleeve assembly 3 and the left sleeve assembly 2, that is, the outer end face of its connecting section b3-3, is provided with a positioning sliding ring 3-5 that matches the positioning sliding groove 2-5 on the outer end face of the connecting section a2-3 of the left sleeve assembly 2. The height of the positioning sliding ring 3-5 is the same as the depth of the positioning sliding groove 2-5.

[0014] The intermediate connector 1 is disposed between the left sleeve assembly 2 and the right sleeve assembly 3. It is barbell-shaped, with a connecting pin 1-1 in the middle and locking caps 1-2 of the same size and shape fixed at both ends. The locking caps 1-2 adopt a stepped structure with the same shape as the connecting holes a2-4 and b3-4. The thickness of the second step of the locking caps 1-2 at both ends is the same as the depth of the second step of the connecting holes a2-4 and b3-4, respectively. The top surface of the first step of the locking caps 1-2 is lower than the inner arc surface of the corresponding cylindrical sleeve. The intermediate connector 1 is clearance-fitted with the connecting holes a2-4 and b3-4 on the right sleeve assembly 3 and the left sleeve assembly 2.

[0015] To improve the convenience of fitting tubular closed-loop swivel assembly 5 when fitting tubular materials, a bevel with an outward inclination angle of 10-15° is provided on the inner side of the ports at both ends of the cylindrical sleeves of the right sleeve assembly 3 and the left sleeve assembly 2, thereby increasing the diameter of the ports and improving the smoothness of fitting the tubular sleeves.

[0016] To increase the strength of the two ends of the cylindrical hollow sleeve a2-1 of the right sleeve assembly 3 and the left sleeve assembly 2, and to prevent them from breaking or cracking, a reinforcing ring with a height of 2-3 mm and a width of 5 mm is provided on the outer side of the two ends of the cylindrical hollow sleeve a2-1 of the right sleeve assembly 3 and the left sleeve assembly 2, to improve their stress resistance and prevent gaps or cracks from appearing at the ends when the pipe is pressurized.

[0017] Another objective of this application is to provide a frame connector based on the above-mentioned two-axis tubular closed rotating assembly, including an upright assembly and a crossbar assembly, the ends of which are connected. The connector is characterized by further including at least one inclined support rod assembly, which is mounted on the upright assembly and the crossbar assembly. Each inclined support rod assembly includes two inclined intersecting diagonal rods 4, connected at their midpoint by a rotating assembly 5. The two inclined intersecting diagonal rods 4 in the inclined support rod assembly are respectively fitted into the left sleeve assembly 2 and the right sleeve assembly 3 of the rotating assembly 5. The intersection angle of the two diagonal rods 4 is changed by rotating the left sleeve assembly 2 and / or the right sleeve assembly 3 about the intermediate connecting member 1 between them. The intersection angle is adjusted according to the fixed position of the ends of the two diagonal rods 4 relative to the upright assembly or the crossbar assembly.

[0018] Preferably, the crossbar assembly is divided into an upper layer and a lower layer, each layer including four horizontal frame bars 6 arranged around the edge to form a rectangular frame, and several horizontal support bars 7 arranged inside the rectangular frame.

[0019] Preferably, the pole assembly includes a vertical rectangular frame composed of several vertically arranged poles, and the upper and lower ends of each vertical pole 8 set on the edge of the rectangular frame are connected to the horizontal frame poles 6 in the two crossbar assemblies and are fixed by a T-joint. Beneficial effects

[0020] ①The two-axis pipe fitting closed rotating kit 5 described in this application has the characteristics of flexible structure and adjustability. The dual-axis linkage design allows the left and right sleeve components 3 to rotate at any angle with the middle connector 1 as the axis, which can adapt to the pipe fitting connection requirements of different intersection angles.

[0021] ② The two-axis pipe fitting closed rotating assembly 5 described in this application has high connection strength and stability. The locking screw hole a2-2 adopts a hollow frustum structure that intersects perpendicularly with the sleeve. With the locking screw, it can provide reliable fixing force and prevent the pipe from loosening. The three-step connecting hole a2-4 and the clearance fit intermediate connecting piece 1 design distribute the force, reduce stress concentration, and improve the overall strength. The matching structure of the positioning sliding groove 2-5 and the positioning sliding ring 2-6 ensures coaxiality during rotation, reduces shaking, improves connection accuracy, and prevents impurities from entering.

[0022] ③ The two-axis pipe fitting closed rotating kit 5 described in this application is easy to assemble. The bevel design on the inner side of its port increases the diameter, which facilitates the quick insertion of the pipe and improves the smoothness of the assembly. The clearance fit between the intermediate connector 1 and the connecting holes a2-4 supports quick installation and disassembly, reducing the difficulty of assembly. The reinforcing ring on the outer side of the port enhances the port strength and prevents gaps or cracks from appearing when pressure is applied. The overall structure adopts a closed design to reduce the entry of external impurities and extend the service life.

[0023] ④ The frame connector described in this application uses an inclined support rod assembly to adjust the cross angle through the rotating kit 5, which enhances the stability and adaptability of the frame structure. It is also modular and expandable, consisting of uprights, crossbars and inclined support rod assemblies. It can be quickly assembled into a rectangular frame through a tee connector, supporting flexible expansion. The cross angle of the inclined support rod assembly is adjustable, making it suitable for building complex support structures, such as temporary supports, equipment frames, etc.

[0024] ⑤ The frame connectors described in this application have excellent mechanical properties. The inclined support rods are connected by the rotating kit 5, and the cross angle can be adjusted according to the force requirements, effectively dispersing the load and enhancing the overall stability. The rectangular layout of the crossbars and uprights forms a rigid structure, improving the frame's resistance to bending and torsion.

[0025] ⑥ The frame connectors described in this application have diverse application scenarios and are suitable for scenarios requiring multi-angle support, such as building construction, industrial equipment installation, and exhibition displays, thus meeting different spatial layout requirements. Attached Figure Description

[0026] Figure 1 It is the three-dimensional structure of the rotating kit.

[0027] Figure 2 This is a schematic diagram of the internal structure of the rotating kit.

[0028] Figure 3 This is a cross-sectional view of the rotating kit along the X direction.

[0029] Figure 4 This is a three-dimensional structural diagram of the left sleeve assembly.

[0030] Figure 5 This is a three-dimensional structural diagram of the right sleeve assembly.

[0031] Figure 6 This is a cross-sectional view of the left sleeve assembly along the X direction.

[0032] Figure 7 This is a cross-sectional view of the right sleeve assembly along the X direction.

[0033] Figure 8 This is a Z-direction cross-sectional view of the left sleeve assembly.

[0034] Figure 9 This is a Z-direction cross-sectional view of the right sleeve assembly.

[0035] Figure 10 This is a cross-sectional view of the left sleeve assembly along the XZ direction.

[0036] Figure 11 This is a cross-sectional view of the right sleeve assembly along the XZ direction.

[0037] Figure 12 This is a three-dimensional structural diagram of the intermediate connector.

[0038] Figure 13 This is a structural schematic diagram of the frame connector described in Embodiment 1.

[0039] Figure 14 This is a schematic diagram of the frame connector described in Embodiment 2.

[0040] In the diagram: 1. Middle connector, 1-1. Connecting pin, 1-2. Locking cap, 2. Left sleeve assembly, 2. Hollow sleeve a2-1. Locking screw hole a2-2. Connecting section a2-3. Connecting hole a2-4. Positioning sliding groove 2-5. Right sleeve assembly, 3. Hollow sleeve b3-1. Locking screw hole b3-2. Connecting section b3-3. Connecting hole b3-4. Positioning sliding ring 3-5. Diagonal rod, 4. Rotating assembly, 5. Horizontal frame rod, 6. Horizontal support rod, 7. Vertical rod, 8. Detailed Implementation

[0041] The present invention will be further described below with reference to the accompanying drawings and embodiments. Example 1

[0042] refer to Figure 1-13 This embodiment provides a two-axis tubular enclosed rotary assembly and a frame connector assembled using the rotary assembly.

[0043] First is the rotating kit, which includes a left sleeve assembly 2 and a right sleeve assembly 3 connected together by an intermediate connector 1;

[0044] The main body of the left sleeve assembly 2 is a cylindrical hollow sleeve a2-1. A locking screw hole a2-2 is provided on its outer circumferential surface. This locking screw hole a2-2 is formed by a hollow frustum with a height equal to 1 / 5 of the diameter of the hollow sleeve a2-1, perpendicularly intersecting the outer shell of the hollow sleeve a2-1. The ratio of the upper and lower base radii of the frustum is 1:2. Threads are formed on its inner wall to mate with a locking screw. The axis of the hollow portion inside the frustum is in the same plane as the axis of the hollow sleeve a2-1 and intersects perpendicularly. On the other side of the outer circumferential surface of the cylindrical hollow sleeve a2-1, at a location coinciding with the axis of the frustum, a connecting section a2-3 is provided. This connecting section a2-3 is entirely a cylinder with a diameter equal to that of the cylindrical hollow sleeve a2-1. The two intersect perpendicularly; a three-step connecting hole a2-4 is provided at the center of the connecting segment a2-3. The connecting hole a2-4 connects to the inner wall of the cylindrical hollow sleeve a2-1. The first step, the second step, and the third step of the connecting hole a2-4 are sequentially opened from the inside to the outside on the inner wall surface. The total height of the three steps is equal to the depth of the entire connecting hole a2-4, and the height ratio of the three steps is 2:3:3, and the diameter ratio of the three steps is 5:4:3. In addition, a concave annular positioning sliding groove 2-5 with the same center as the connecting hole a2-4 is provided on the outer end face of the connecting segment a2-3. The depth of the positioning sliding groove 2-5 is 1 / 2 of the thickness of the entire connecting segment a2-3.

[0045] The right sleeve assembly 3 is symmetrically positioned to the left sleeve assembly 2. It also includes a cylindrical hollow sleeve b3-1, a hollow frustum-shaped locking screw hole b3-2, and a connecting section b3-3. The shape, structure, and dimensions of the hollow sleeve b3-1 and the locking screw hole b3-2 are completely identical to those on the left sleeve assembly 2. The axes of the connecting sections a2-3 and b3-3, and the connecting holes a2-4 and b3-4 on the connecting sections a2-3 and b3-3, coincide and can rotate at any angle around this coincident axis. The contact surface between the right sleeve assembly 3 and the left sleeve assembly 2, i.e., the outer end face of its connecting section b3-3, is provided with a connection point for the left sleeve assembly 2. A positioning sliding ring 3-5 is provided on the outer end face of segment a2-3 to match the positioning sliding groove 2-5. The height of the positioning sliding ring 3-5 is consistent with the depth of the positioning sliding groove 2-5. On the inner side of the ports at both ends of the cylindrical sleeves of the right sleeve assembly 3 and the left sleeve assembly 2, a bevel with an outward inclination angle of 10-15° is provided to increase the diameter of the port and improve the smoothness of the sleeve assembly. On the outer side of the ports at both ends of the cylindrical hollow sleeve a2-1 of the right sleeve assembly 3 and the left sleeve assembly 2, a reinforcing ring with a height of 2-3mm and a width of 5mm is provided to improve its stress resistance and prevent gaps or cracks from appearing at the ports when the pipe is pressurized.

[0046] The intermediate connector 1 is located between the left sleeve assembly 2 and the right sleeve assembly 3. It is barbell-shaped with a connecting pin 1-1 in the middle and locking caps 1-2 of the same size and shape fixed at both ends. The locking caps 1-2 adopt a stepped structure with the same shape as the connecting holes a2-4 and b3-4. The thickness of the second step of the locking caps 1-2 at both ends is the same as the depth of the second step of the connecting holes a2-4 and b3-4, respectively. The top surface of the first step of the locking caps 1-2 is lower than the inner wall arc surface of the corresponding cylindrical sleeve. The intermediate connector 1 is clearance-fitted with the connecting holes a2-4 and b3-4 on the right sleeve assembly 3 and the left sleeve assembly 2.

[0047] Use this rotating kit to assemble the frame connectors.

[0048] Insert the two diagonal rods 4 into the hollow sleeves a2-1 and b3-1 of the left sleeve assembly 2 and right sleeve assembly 3 of the rotating kit 5, respectively; fix the diagonal rods 4 with the locking screws in the locking screw holes a2-2 and b3-2; adjust the rotation angle of the left and right sleeve assemblies 2 and 3 so that the intersection angle of the two diagonal rods 4 is 60°; connect the two vertical uprights 8 and the two horizontal frame rods 6 through the joint to form a rectangular frame, and install the inclined support rod assembly on the rectangular frame through the rotating kit 5. Fix the two ends of the diagonal rods 4 to the uprights 8 and the horizontal rods 6 with bolts, respectively. Example 2

[0049] refer to Figure 1-12 14. The structure of the rotating kit is consistent with that of Embodiment 1. The frame connector assembled using the rotating kit includes an upright assembly and a crossbar assembly, the ends of which are connected. It also includes at least one inclined support rod assembly, which is installed on the upright assembly and the crossbar assembly. Each inclined support rod assembly includes two inclined intersecting diagonal rods 4, which are connected at their midpoints by the rotating kit 5. The two inclined intersecting diagonal rods 4 in the inclined support rod assembly are respectively fitted into the left sleeve assembly 2 and the right sleeve assembly 3 of the rotating kit 5. The intersection angle of the two diagonal rods 4 is determined by the left sleeve assembly 2 and / or The right sleeve assembly 3 rotates around the intermediate connecting piece 1 between the two to change the cross angle according to the fixed position of the ends of the two diagonal rods 4 with the upright assembly or the crossbar assembly; the crossbar assembly is divided into an upper layer and a lower layer, each layer including four horizontal frame rods 6 set on the edge to form a rectangular frame, and three horizontal support rods 7 set inside the rectangular frame; the upright assembly includes a vertical rectangular frame composed of four vertically set uprights, and the upper and lower ends of each vertical upright 8 set on the edge of the rectangular frame are connected to the horizontal frame rods 6 in the two crossbar assemblies and fixed by a tee connector.

Claims

1. A two-axis pipe closure rotary sleeve assembly, characterized by, The kit is a double-shaft linkage structure, comprising a left sleeve assembly (2) and a right sleeve assembly (3) connected together through an intermediate connecting piece (1); The main body of the left sleeve assembly (2) is a cylindrical hollow sleeve a (2-1), a locking screw hole a (2-2) is arranged on the outer circumferential surface of the cylindrical hollow sleeve a (2-1), the locking screw hole a (2-2) is integrated by the vertical intersection of a hollow circular truncated cone with a height of 1 / 5 of the diameter of the hollow sleeve a (2-1) and the outer shell of the hollow sleeve a (2-1), the upper and lower bottom surfaces of the circular truncated cone have a radius ratio of 1:2, the inner wall is provided with threads matched with the locking screw; the axis of the hollow part in the hollow circular truncated cone and the axis of the hollow sleeve a (2-1) are in the same plane and vertically intersect; a connecting section a (2-3) is arranged on the other side of the outer circumferential surface of the cylindrical hollow sleeve a (2-1) and coincides with the axis of the circular truncated cone, the connecting section a (2-3) is a cylinder with a diameter equal to that of the cylindrical hollow sleeve a (2-1), and the two vertically intersect; the center of the connecting section a (2-3) is provided with a three-step connecting hole a (2-4), the connecting hole a (2-4) communicates with the inner wall of the cylindrical hollow sleeve a (2-1), and the first, second and third step portions of the connecting hole a (2-4) are sequentially arranged on the inner wall surface from inside to outside, the total height of the three step portions is equal to the depth of the entire connecting hole a (2-4), and the height ratio of the three step portions is 2:3:3, and the diameter ratio of the three step portions is 5:4:3; in addition, an inner recessed annular positioning sliding groove (2-5) with the same center as the connecting hole a (2-4) is arranged on the outer end surface of the connecting section a (2-3), and the depth of the positioning sliding groove (2-5) is 1 / 2 of the thickness of the entire connecting section a (2-3); The right sleeve assembly (3) is symmetrical to the left sleeve assembly (2) in position and also includes a cylindrical hollow sleeve b (3-1), a hollow circular truncated cone-shaped locking screw hole b (3-2) and a connecting section b (3-3), the shape, structure and size of the hollow sleeve b (3-1) and the locking screw hole b (3-2) are completely consistent with those of the left sleeve assembly (2), the connecting holes a (2-4) and the connecting holes b (3-4) on the connecting sections a (2-3) and the connecting sections b (3-3) of the two are coincident in axis, and rotate at any angle with the coincident axis as the axis; the contact surface of the right sleeve assembly (3) and the left sleeve assembly (2), i.e. on the outer end surface of the connecting section b (3-3), is provided with a positioning sliding ring (3-5) matched with the positioning sliding groove (2-5) on the outer end surface of the connecting section a (2-3) of the left sleeve assembly (2), and the height of the positioning sliding ring (3-5) is consistent with the depth of the positioning sliding groove (2-5). The intermediate connecting piece (1) is arranged between the left sleeve assembly (2) and the right sleeve assembly (3), and the whole is in the shape of a barbell, the middle part is a connecting pin (1-1), and the two ends are fixed with locking caps (1-2) of the same size and shape; the locking cap (1-2) adopts a stepped structure with the same shape as the connecting hole a (2-4) and the connecting hole b (3-4), wherein the thickness of the second step part of the locking cap (1-2) at the two ends is consistent with the depth of the second step part of the connecting hole a (2-4) and the connecting hole b (3-4), respectively, and the top surface of the first step part of the locking cap (1-2) is lower than the inner wall arc surface of the corresponding cylindrical sleeve; the intermediate connecting piece (1) is in clearance fit with the connecting hole a (2-4) and the connecting hole b (3-4) on the right sleeve assembly (3) and the left sleeve assembly (2).

2. A two-axis pipe closure rotary union assembly as defined in claim 1, wherein, A bevel with an outward inclination angle of 10-15° is arranged on the inner side of the port at the two ends of the cylindrical sleeve of the right sleeve assembly (3) and the left sleeve assembly (2) respectively, so as to increase the diameter of the port.

3. A two-axis pipe closure rotary union assembly according to claim 1 or 2, wherein, A reinforcing ring with a height of 2-3mm and a width of 5mm is arranged on the outer side of the port at the two ends of the cylindrical hollow sleeve a (2-1) of the right sleeve assembly (3) and the left sleeve assembly (2) respectively.

4. A frame connector assembled by the closed rotating sleeve assembly of the two-axis pipe fitting according to any one of claims 1, 2 and 3, comprising a vertical rod assembly and a horizontal rod assembly, the ends of which are connected, characterized in that, Further comprising at least one inclined support rod assembly, the inclined support rod assembly is installed on the vertical rod assembly and the horizontal rod assembly, each inclined support rod assembly comprises two inclined and crossed inclined rods (4), and the middle positions of the two are connected through a rotating sleeve (5); the two inclined and crossed inclined rods (4) in the inclined support rod assembly are respectively sleeved into the left sleeve assembly (2) and the right sleeve assembly (3) of the rotating sleeve (5), and the crossing angle of the two inclined rods (4) is changed by rotating the left sleeve assembly (2) and / or the right sleeve assembly (3) about the intermediate connecting piece (1) therebetween, and the crossing angle is adjusted according to the fixed positions of the end portions of the two inclined rods (4) and the vertical rod assembly or the horizontal rod assembly.

5. The frame connection of claim 4, wherein, The horizontal rod assembly is divided into upper and lower layers, each layer comprises four horizontal edge frame rods (6) arranged in a rectangular frame at the edges, and a plurality of horizontal support rods (7) arranged in the rectangular frame.

6. Frame connection according to claim 4 or 5, characterized in that The vertical rod assembly comprises a vertical rectangular frame composed of a plurality of vertically arranged vertical rods, and each vertical vertical rod (8) arranged on the edges of the rectangular frame has two ends connected with the horizontal edge frame rods (6) in the two horizontal rod assemblies and fixed by a tee joint.

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