Rotary joint and folding net rack

Abstract

The utility model is suitable for the technical field of sporting goods, and provides a rotary joint and a folding net rack. The rotary joint comprises the first connecting piece, the second connecting piece and the adjusting assembly which are all full-plastic products and can be more safely suitable for young children to play. The first connecting piece comprises a first end, and the second connecting piece is rotationally connected with the first connecting piece and comprises a second end. The adjusting assembly is connected to the first connecting piece, and the free end of the adjusting assembly slides between the first position and the second position in the direction perpendicular to the rotating face where the two connecting pieces rotate relatively. The adjusting assembly releases the limiting of the second connecting piece at the first position; the adjusting assembly limits the second connecting piece at the second position. Thus, through the adjusting assembly, angle adjustment of the first connecting piece and the second connecting piece can be achieved; and the second connecting piece can be fixed on the first connecting piece, so that the use reliability of the folding net rack is improved.

Description

Technical Field

[0001] This utility model belongs to the field of sporting goods technology, and in particular relates to a rotary joint and a folding mesh frame. Background Technology

[0002] In ball sports such as football, hockey, and tennis, net stands connected to the net are typically used for training and matches. For ease of storage and organization, these net stands are designed to fold using hinges. However, hinged connections have relatively poor structural stability and cannot reliably maintain the folded net stand in its unfolded or folded state, making them inconvenient for users. Utility Model Content

[0003] In view of this, the present invention provides a rotary joint and a folding mesh frame to solve the technical problem of how to improve the reliability of the folding mesh frame.

[0004] To solve the above problems, the technical solution provided by this utility model embodiment is as follows:

[0005] This utility model embodiment provides a rotary joint, comprising: a first connecting member, including a first end for mounting a connecting rod; a second connecting member, rotatably connected to the first connecting member, and including a second end for mounting a connecting rod; and an adjusting assembly connected to the first connecting member, wherein, in a direction perpendicular to the rotational surfaces of the first connecting member and the second connecting member, the free end of the adjusting assembly slides between a first position close to the first connecting member and a second position away from the first connecting member; wherein, in the first position, the adjusting assembly releases the restriction on the second connecting member, allowing the second connecting member to rotate relative to the first connecting member; and in the second position, the adjusting assembly restricts the second connecting member to fix the second connecting member.

[0006] In some embodiments, the first connector, the second connector, and the adjustment assembly are all plastic parts.

[0007] In some embodiments, the first connector further includes a first body connected to the first end, and the second connector further includes a second body connected to the second end; wherein the first body and the second body are disposed opposite to each other and form a mounting cavity; the adjustment component is installed in the mounting cavity and partially protrudes from the second connector to form a free end for receiving pressure.

[0008] In some embodiments, the adjustment assembly includes: a limiting member that slides axially along the mounting cavity and is limited in the circumferential direction by the first body, the limiting member being movably connected to the second body; a button that abuts against the limiting member and has one end protruding from the second body to form the free end; the button moving from the second position to the first position drives the limiting member to release the limitation on the second body; and an elastic reset member that abuts between the first body and the limiting member, and can move the button from the first position to the second position by driving the limiting member.

[0009] In some embodiments, one of the limiting member and the second body has an arc-shaped guide groove, and the other has a snap-fit ​​portion adapted to the arc-shaped guide groove; wherein, both opposite ends of the arc-shaped guide groove can be snapped into the snap-fit ​​portion.

[0010] In some embodiments, a protrusion is provided in the arc-shaped guide groove, the protrusion is spaced apart from the opposite ends of the arc-shaped guide groove, and respectively forms a slot for engaging the engaging part with the opposite ends of the arc-shaped guide groove.

[0011] In some embodiments, multiple elastic reset elements are provided, and the multiple elastic reset elements are distributed circumferentially along the mounting cavity; and / or, the button is coaxially arranged with both the first body and the second body.

[0012] In some embodiments, one of the first body and the second body is provided with a slot, and the other is provided with a plug portion adapted to the slot, the slot being disposed around the limiting member; the plug portion is inserted into the slot and rotates circumferentially within the slot.

[0013] In some embodiments, the included angle between the first end and the second end is in the range of [0, 90°], and at the limit of the range, the adjustment component limits the second connector.

[0014] This utility model embodiment also provides a folding mesh frame, including the above-mentioned rotary joint. The folding mesh frame further includes: a plurality of connecting rods, which are connected to each other through the rotary joint. The first end and the second end are both equipped with the connecting rods, and the plurality of connecting rods overlap or unfold through the rotary joint.

[0015] This utility model provides a rotary joint and a folding mesh frame, including a first connecting member, a second connecting member, and an adjusting assembly. The first connecting member includes a first end, and the second connecting member is rotatably connected to the first connecting member and includes a second end. The adjusting assembly is connected to the first connecting member, and its free end slides between a first position and a second position in a direction perpendicular to the rotation plane of the first and second connecting members. In the first position, the adjusting assembly releases the restriction on the second connecting member, allowing the second connecting member to rotate relative to the first connecting member; in the second position, the adjusting assembly restricts the second connecting member to fix it. Thus, by adjusting the assembly, the angle between the first and second connecting members can be adjusted, thereby changing the angle of the two connecting rods respectively installed on the first and second ends to switch the folding mesh frame to a folded or unfolded state; it can also fix the second connecting member to the first connecting member, maintaining the position of the connecting rods, thereby keeping the folding mesh frame in a folded or unfolded state, improving the reliability of the folding mesh frame. In addition, since the position in the rotary joint that receives the force applied by the user (the free end of the adjustment component) is perpendicular to the angle adjustment surface of the two connecting rods, the user's operating space is not affected by the volume of the connecting rods, making operation more convenient and providing a better user experience. Attached Figure Description

[0016] Figure 1 A perspective view of the rotary joint provided in an embodiment of this utility model;

[0017] Figure 2 The rotary joint provided in the embodiments of this utility model is Figure 1 A cross-sectional view along the AA direction;

[0018] Figure 3 An exploded view of the rotary joint provided in an embodiment of this utility model;

[0019] Figure 4 This is a schematic diagram showing the rotary joint of this utility model rotated to an extreme position according to an embodiment of the present invention;

[0020] Figure 5 This is a schematic diagram of the rotary joint provided in this embodiment of the utility model rotating to another extreme position.

[0021] Explanation of reference numerals in the attached figures:

[0022] 1. First connector; 11. First end; 12. First body; 121. Slot; 13. Mounting cavity; 2. Second connector; 21. Second end; 22. Second body; 221. Snap-fit ​​part; 222. Insertion part; 3. Adjustment component; 31. Limiting component; 311. Arc-shaped guide groove; 312. Protrusion; 313. Slot; 32. Button; 321. Free end; 33. Elastic reset component. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0024] The specific technical features described in the specific embodiments can be combined in any suitable manner without contradiction. For example, different combinations of specific technical features can form different embodiments and technical solutions. To avoid unnecessary repetition, the various possible combinations of the specific technical features in this utility model will not be described separately.

[0025] In the following description, the terms "first," "second," "etc." are used merely to distinguish different objects and do not indicate that the objects have the sameness or relationship. It should be understood that the directional descriptions "above," "below," "outside," and "inside" refer to the directions under normal use, while "left" and "right" refer to the left and right directions shown in the corresponding diagrams, which may or may not be the left and right directions under normal use.

[0026] It should be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. "A plurality of" means two or more.

[0027] Firstly, this utility model embodiment provides a rotary joint that can be applied to net frames used in ball sports such as football, tennis, and hockey. It should be noted that the application scenario of this utility model embodiment does not limit the structure of the rotary joint.

[0028] like Figure 1As shown, the rotary joint includes a first connector 1, a second connector 2, and an adjustment assembly 3. The first connector 1 includes a first end 11 for mounting the connecting rod, and the second connector 2 includes a second end 21 for mounting the connecting rod. The second connector 2 is rotatably connected to the first connector 1. That is, a part of the first connector 1 is assembled with the second connector 2, and the other part of the first connector 1 forms the first end 11 for mounting the connecting rod. Therefore, the first end 11 can be simply defined as the part of the first connector 1 that does not have a connection with the second connector 2, and the first end 11 has a free end of the first connector 1. Similarly, the second end 21 is the part of the second connector 2 that does not have a connection with the first connector 1, and the second end 21 has a free end of the second connector 2. Rotating the second connector 2 changes the angle between the first end 11 and the second end 21, thereby changing the angle between the two connecting rods, and thus realizing the folding or unfolding of the folding frame.

[0029] like Figure 2 As shown, the adjusting component 3 is connected to the first connecting member 1. In a direction perpendicular to the rotational plane of the first connecting member 1 and the second connecting member 2, the free end 321 of the adjusting component 3 slides between a first position close to the first connecting member 1 and a second position away from the first connecting member 1. That is, the sliding direction of the adjusting component 3 is perpendicular to the plane containing the angle between the first end 11 and the second end 21. Therefore, the movement of the adjusting component 3 will not interfere with the change of the angle, thus reducing the interference of the linkage volume on the operation of the adjusting component 3 and making it convenient for the user to operate the adjusting component 3 to adjust the angle between the first end 11 and the second end 21. Figure 1 The plane of the paper extends roughly in the direction of rotation of the first connector 1 and the second connector 2; Figure 2 The direction of the paper plane shown is approximately the sliding direction of the adjusting component 3.

[0030] like Figure 3 As shown, in the first position, the adjusting component 3 releases the restriction on the second connecting member 2, allowing the second connecting member 2 to rotate relative to the first connecting member 1, thereby changing the included angle between the first end 11 and the second end 21, realizing the folding and unfolding of the folding frame. In the second position, the adjusting component 3 restricts the second connecting member 2 to fix it. The second connecting member 2 remains fixed to the first connecting member 1, thereby keeping the connecting rods installed on the first end 11 and the second end 21 in a fixed position, thus keeping the folding frame in the folded or unfolded state.

[0031] The rotary joint provided in this embodiment includes a first connecting member 1, a second connecting member 2, and an adjusting assembly 3. The first connecting member 1 includes a first end 11, and the second connecting member 2 is rotatably connected to the first connecting member 1 and includes a second end 21. The adjusting assembly 3 is connected to the first connecting member 1, and in a direction perpendicular to the rotational plane of the first connecting member 1 and the second connecting member 2, the free end 321 of the adjusting assembly 3 slides between a first position close to the first connecting member 1 and a second position away from the first connecting member 1. In the first position, the adjusting assembly 3 releases the restriction on the second connecting member 2, allowing the second connecting member 2 to rotate relative to the first connecting member 1; in the second position, the adjusting assembly 3 restricts the second connecting member 2 to fix it. Thus, by adjusting the assembly 3, the angle between the first connecting member 1 and the second connecting member 2 can be adjusted, thereby changing the angle of the two connecting rods respectively installed on the first end 11 and the second end 21 to switch the folding mesh frame to folded or unfolded; the second connecting member 2 can also be fixed to the first connecting member 1, maintaining the position of the connecting rods, thereby keeping the folding mesh frame in a folded or unfolded state, improving the reliability of the folding mesh frame. In addition, since the position in the rotary joint that receives the force applied by the user (the free end 321 of the adjustment component 3) is perpendicular to the angle adjustment surface of the two connecting rods, the user's operating space will not be interfered with by the volume of the connecting rods, making it convenient for the user to operate and reducing the possibility of the user being hit by the connecting rods, resulting in a better user experience.

[0032] In some embodiments, such as Figure 1 As shown, the first connector 1, the second connector 2, and the adjusting component 3 are all made of plastic. Thus, the entire rotary joint is made of plastic, without any metal parts. Since plastic is generally lighter than metal, it reduces the risk of injury in accidents. Furthermore, because plastic has good toughness and flexibility, it can absorb energy upon impact, thereby reducing injuries from breakage and sharp edges, resulting in higher safety. This allows the folding net frame to be used for youth training or competitions, and the all-plastic construction is also safer for young children to play with, making its applications more widespread.

[0033] In some embodiments, such as Figure 2 and Figure 3As shown, the first connector 1 further includes a first body 12 connected to the first end 11, and the second connector 2 further includes a second body 22 connected to the second end 21. The first body 12 and the second body 22 are arranged opposite to each other and form a mounting cavity 13. That is, the first body 12 is the part of the first connector 1 that is connected to the second connector 2, and the second body 22 is the part of the second connector 2 that is connected to the first connector 1. The first body 12 and the second body 22 are opposite in position to each other, for example, the opening side of the first body 12 is opposite to the opening side of the second body 22. For example, the opening of the first body 12 faces upward, and the opening of the second body 22 faces downward. After the first body 12 and the second body 22 are connected vertically, a closed mounting cavity 13 is formed. The adjustment component 3 is installed in the mounting cavity 13 and partially protrudes from the second connector 2 to form a free end 321 for receiving pressure. In this way, the free end 321 of the adjustment component 3 protrudes from the second connector 2 and is located on the outer contour of the rotary joint, which makes it convenient for the user to apply force and press, reducing the difficulty of operation.

[0034] In some embodiments, such as Figure 2 and Figure 3 As shown, the adjustment assembly 3 includes a limiting member 31, a button 32, and an elastic reset member 33. The limiting member 31 slides along the axial direction of the mounting cavity 13 and is limited in the circumferential direction by the first body 12. The limiting member 31 is movably connected to the second body 22. Specifically, the limiting member 31 is movably connected to the second body 22 in both the circumferential and axial directions of the mounting cavity 13. The button 32 abuts against the limiting member 31, and one end protrudes from the second body 22 to form a free end 321. The button 32 is pressed and moves from the second position to the first position. The button 32 abuts against the limiting member 31 and moves in the pressing direction, thereby driving the limiting member 31 to move away from the second body 22, thereby releasing the limitation on the second body 22. The elastic reset member 33 abuts between the first body 12 and the limiting member 31. When pressed, the elastic reset member 33 compresses and deforms. After the pressure on the button 32 is released, the elastic reset member 33 can drive the limiting member 31 to move the button 32 from the first position to the second position. That is, the elastic force released by the elastic reset member 33 resets the button 32 by driving the limiting member 31. In this way, the button 32 and the elastic reset member 33 abut against the two ends of the limiting member 31 respectively. During the pressing process, the button 32 can abut against the limiting member 31 to unlock the second body 22. After the user releases the pressure, the elastic reset member 33 restores its deformation and drives the limiting member 31 and the button 32 to automatically reset. The structure is simple, and both move within the mounting cavity 13 without being interfered with by the volume of the connecting rod, making it convenient to operate.

[0035] In some embodiments, such as Figure 2 and Figure 3As shown, one of the limiting member 31 and the second body 22 has an arc-shaped guide groove 311, and the other has a snap-fit ​​portion 221 adapted to the arc-shaped guide groove 311. Specifically, the limiting member 31 may be provided with an arc-shaped guide groove 311, and the second body 22 may be provided with a snap-fit ​​portion 221; of course, the second body 22 may also be provided with an arc-shaped guide groove 311, and the limiting member 31 may be provided with a snap-fit ​​portion 221.

[0036] like Figure 4 and Figure 5 As shown, both ends of the arc-shaped guide groove 311 can engage with the snap-fit ​​part 221 to form a limiting member 31 that limits the second body 22. That is, regardless of which end the snap-fit ​​part 221 moves to, the limiting member 31 can engage with the second body 22, restricting its circumferential rotation and thus maintaining its fixed position. Therefore, it can be understood that the two ends of the arc-shaped guide groove 311 respectively form the limit positions of the rotary joint after rotation, for example... Figure 4 The diagram shows the rotary joint rotated to one of its extreme positions. At this point, the folding frame can be folded through the rotary joint. Figure 5 The diagram shows the rotary joint rotated to another extreme position, at which point the folding mesh frame can be unfolded through the rotary joint.

[0037] Thus, the shape of the arc-shaped guide groove 311 forms the movement trajectory of the locking part 221, thereby restricting the rotation path of the locking part 221. The arc-shaped guide groove 311 can engage with the locking part 221 at both ends, thereby restricting the rotation of the second body 22. The design is ingenious. The rotation range of the second body 22 can be adjusted by controlling the structural parameters of the arc-shaped guide groove 311. The structure is relatively simple and easy to process and implement.

[0038] In some embodiments, such as Figures 3-5As shown, a protrusion 312 is provided within the arc-shaped guide groove 311. The protrusion 312 is spaced apart from the opposite ends of the arc-shaped guide groove 311 and forms a slot 313 for the engaging part 221 with the opposite ends of the arc-shaped guide groove 311. That is, both opposite ends of the arc-shaped guide groove 311 have slots 313, which can engage with the engaging part 221 to limit the second body 22 by the limiting member 31. This restricts the rotation of the second body 22 when the folded mesh frame is in the unfolded or folded state, improving the reliability of the folded mesh frame. It can be understood that when the second body 22 rotates relative to the first body 12, the engaging part 221 rotates between the two slots 313 and can abut against the protrusion 312. Furthermore, since the protrusion 312 has a certain extension length when positioned between the two slots 313, pressing the button 32 and disengaging the engaging part 221 from the slot 313 allows the engaging part 221 to abut against the protrusion 312 and be restricted by it, preventing it from re-entering the slot 313. Therefore, there is no need to press the button 32 for an extended period during rotation, reducing the user's operational difficulty. Of course, for smoother rotation, the user can also continuously press the button 32 during rotation to create a gap between the engaging part 221 and the protrusion 312. The user can choose the specific operating method according to actual usage needs. In short, the protrusion 312, together with the walls of the arc-shaped guide groove 311 at both ends, forms the slot 313, thereby restricting the degree of freedom of the second body 22's circumferential rotation and reliably maintaining the position of the second connector 2.

[0039] In some embodiments, such as Figure 3 As shown, a plurality of elastic reset members 33 are provided between the limiting member 31 and the first body 12, and the plurality of elastic reset members 33 are distributed along the circumference of the mounting cavity 13. In this way, the plurality of elastic reset members 33 can abut against the limiting member 31 at multiple positions, increasing the contact area, and the limiting member 31 is subjected to more uniform force, which facilitates the button 32 to be reset more quickly and without tilting.

[0040] In some embodiments, such as Figure 2 and Figure 3 As shown, button 32 is coaxially arranged with the first body 12 and the second body 22. In this way, button 32 can apply force at the center of the first body 12 and the second body 22, and the force applied by the user when pressing is more evenly distributed on the first body 12 and the second body 22, which helps to maintain the structural stability of the first body 12 and the second body 22.

[0041] In some embodiments, such as Figure 2 and Figure 3As shown, one of the first body 12 and the second body 22 is provided with a slot 121, and the other is provided with a plug-in portion 222 adapted to the slot 121. The slot 121 is arranged around the limiting member 31. Specifically, the first body 12 may be provided with the slot 121 and the second body 22 may be provided with the plug-in portion 222; or the second body 22 may be provided with the plug-in portion 222 and the first body 12 may be provided with the slot 121. The plug-in portion 222 is inserted into the slot 121 and rotates circumferentially within the slot 121. That is, the structural shape of the slot 121 forms the movement trajectory of the plug-in portion 222, thereby guiding the plug-in portion 222. This allows the second body 22 to rotate relative to the first body 12 without tilting, enabling the second body 22 to rotate more reliably and to return to its two extreme positions more stably. This improves the reliability of the folding frame during the transition from the unfolded to the folded state and in the unfolded or folded state.

[0042] In some embodiments, such as Figure 1 As shown, the included angle between the first end 11 and the second end 21 is within the range of [0, 90°], that is, the included angle between the first end 11 and the second end 21 is greater than or equal to 0 degrees and less than or equal to 90 degrees. At the limit of the range, the adjusting component 3 limits the second connecting member 2, that is, the second end 21 can rotate relative to the first end 11 within the range of 0 to 90 degrees. When the included angle between the second end 21 and the first end 11 is greater than 0 degrees and less than 90 degrees, the free end 321 of the adjusting component 3 is in the second position; when the second end 21 rotates to form an included angle of 0 degrees or 90 degrees with the first end 11, the free end 321 of the adjusting component 3 switches to the first position and limits the second connecting member 2. Specifically, when the included angle between the first end 11 and the second end 21 is 0 degrees, the first end 11 and the second end 21 are parallel, thereby allowing the folding frame to be folded; when the included angle between the first end 11 and the second end 21 is 90 degrees, the first end 11 and the second end 21 are perpendicular, thereby allowing the folding frame to be unfolded. Understandably, within the 0-180 degree range, the larger the angle between the first end 11 and the second end 21, the greater the possibility that the second end 21 may loosen due to accidental contact with external force. However, if the adjustable range of the angle between the first end 11 and the second end 21 is too small, a larger number of connecting rods are required to unfold the folding frame for use. Thus, by reasonably designing the angle range between the first end 11 and the second end 21, the rotation range of the second connecting member 2 relative to the first connecting member 1 can be controlled, so that the folding frame can be reliably maintained in the unfolded state while facilitating its unfolding.

[0043] Secondly, this utility model embodiment also provides a folding mesh frame, which includes the rotary joint described in the first aspect. The folding mesh frame also includes multiple connecting rods, which are connected to each other via the rotary joint. Connecting rods are installed on both the first end 11 and the second end 21, and the multiple connecting rods are parallel or at an angle greater than 0 degrees through the rotary joint. Specifically, by adjusting the included angle between the first end 11 and the second end 21, the angle between two connecting rods connected to the same rotary joint can be adjusted, thereby realizing the folding and unfolding of the folding mesh frame. Since this folding mesh frame includes the rotary joint described in the first aspect, it has the same technical effect: the folding mesh frame is convenient for users to operate and adjust the angle, and can reliably maintain the folded or unfolded state, providing a better user experience. Furthermore, since the rotary joint is made entirely of plastic, it has higher safety and is suitable for young children to play with.

[0044] like Figures 1-5 As shown, for ease of understanding, this utility model embodiment provides an implementable solution. The implementation principle is as follows: the rotary joint is made of a first connecting member 1, a second connecting member 2, and an adjusting component 3. All three components—first connecting member 1, second connecting member 2, and adjusting component 3—are plastic parts, meaning the rotary joint is an all-plastic product, offering higher safety and making it suitable for young children to play with. When the folding frame is in the folded state, the angle between the first end 11 and the second end 21 is 0 degrees (refer to...). Figure 4 At this time, the snap-fit ​​part 221 in the second body 22 snaps into one of the slots 313 (lower slot 313) of the arc-shaped guide groove 311. By restricting the degree of freedom of the second connector 2 to move circumferentially, the folding frame is reliably kept in the folded state. Pressing the button 32 and rotating the second connector 2 at the same time causes the button 32 to move from the second position to the first position. The button 32 drives the limiting member 31 to move downward, causing the snap-fit ​​part 221 to disengage from the slot 313 and abut against the protrusion 312 (see reference). Figure 2 At this point, the locking part 221 has no restricted freedom of movement in the circumferential direction within the mounting cavity 13, and the second connecting member 2 can continue to rotate. Until the second connecting member 2 continues to rotate, causing the locking part 221 to rotate into another slot 313 (upper slot 313) of the arc-shaped guide groove 311, the circumferential freedom of the second connecting member 2 is restricted again (see reference). Figure 5 This allows the folded mesh frame to be reliably kept in the unfolded state, at which point the angle between the first end 11 and the second end 21 is 90 degrees.

[0045] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A rotary joint, characterized by The application relates to a rotary joint. The rotary joint comprises: a first connecting piece comprising a first end portion for mounting a connecting rod; a second connecting piece rotatably connected with the first connecting piece and comprising a second end portion for mounting the connecting rod; an adjusting assembly connected with the first connecting piece, a free end of the adjusting assembly being slidable between a first position close to the first connecting piece and a second position away from the first connecting piece in a direction perpendicular to a rotation plane of the first connecting piece and the second connecting piece; 2. The rotary joint of claim 1, wherein, wherein the adjusting assembly releases the second connecting piece from limitation in the first position, and the second connecting piece is rotatable relative to the first connecting piece; and the adjusting assembly limits the second connecting piece in the second position to fix the second connecting piece.

3. The rotary joint of claim 1, wherein, The first connecting piece, the second connecting piece and the adjusting assembly are plastic parts. The first connecting piece further comprises a first body connected with the first end portion, and the second connecting piece further comprises a second body connected with the second end portion; 4. The rotary joint of claim 3, wherein, wherein the first body and the second body are oppositely arranged and enclose an installation cavity; the adjusting assembly is installed in the installation cavity and partially protrudes from the second connecting piece to form a free end for receiving pressing. The adjusting assembly comprises: a limiting piece slidable along an axial direction of the installation cavity and limited by the first body in a circumferential direction of the installation cavity, the limiting piece being movably connected with the second body; a button abutting against the limiting piece and having one end protruding from the second body to form the free end; the button is moved from the second position to the first position to drive the limiting piece to release the second body from limitation; 5. The rotary joint of claim 4, wherein, a resilient reset piece abutting between the first body and the limiting piece, the button being moved from the first position to the second position by driving the limiting piece. One of the limiting piece and the second body has an arc-shaped guide groove, and the other has a clamping portion matched with the arc-shaped guide groove; 6. The rotary joint of claim 5, wherein, wherein opposite ends of the arc-shaped guide groove are capable of clamping the clamping portion.

7. The rotary joint of claim 4, wherein, The arc-shaped guide groove is provided with a protrusion, the protrusion is spaced from the opposite ends of the arc-shaped guide groove and encloses the opposite ends of the arc-shaped guide groove to form a clamping groove for clamping the clamping portion. A plurality of the resilient reset pieces are distributed in the circumferential direction of the installation cavity.

8. The rotary joint of claim 4, wherein, And / or, the button is coaxially arranged with the first body and the second body. One of the first body and the second body is provided with a slot, and the other is provided with a plug-in portion matched with the slot, the slot surrounds the limiting piece; 9. A rotary joint according to any one of claims 1 to 8, characterised in that, the plug-in portion is plugged into the slot and rotates in the circumferential direction in the slot.

10. A foldable netting characterized in that, An included angle between the first end portion and the second end portion is in the range of [0, 90°], and when the included angle is at the limit value of the range, the adjusting assembly limits the second connecting piece. The application further relates to a folding net rack comprising the rotary joint of any one of claims 1 to 9. A plurality of connecting rods are connected through the rotary joint, the first end portion and the second end portion are both provided with the connecting rods, and the plurality of connecting rods are overlapped or unfolded through the rotary joint.

Images