Quick locking and positioning device for folding net rack

Abstract

The application discloses a quick locking and limiting device for a folding net rack, which connects an upper hub disc and a lower hub disc of the folding net rack by inserting a self-locking steel column into a self-locking assembly of the upper hub disc, and locks and limits the self-locking steel column by a steel ball cooperating with a steel bowl under the elastic force of a compression spring. The device is characterized in that it comprises an upper hub disc assembly, a lower hub disc assembly, a self-locking steel column and a locking assembly for locking the self-locking steel column, the lower hub disc assembly is arranged at one end of the self-locking steel column, the locking assembly is arranged in the upper hub disc assembly, the self-locking steel column is inserted into the locking assembly at the other end, the self-locking steel column is provided with a steel column bottom plate at one end, the other end of the self-locking steel column is in a conical structure, the lower hub disc assembly is composed of a lower hub disc top plate, a lower hub disc bottom plate, a bottom plate groove and a top plate groove, and the upper hub disc assembly is composed of an upper hub disc top plate, a top plate reserved hole, an upper hub disc bottom plate, an installation groove, a steel bowl groove, a steel column guide hole and a guide groove.

Description

Technical Field

[0001] This invention relates to a quick-locking and limiting device for folding space frames, belonging to the field of folding space frame technology. Specifically, it relates to a locking and limiting device that can be quickly installed and has a self-locking function. Background Technology

[0002] Folding mesh frames are widely used in outdoor tent frames due to their convenient transportation, easy assembly and disassembly. Because the folding mesh frame structures of some large tents are quite bulky, they are often divided into multiple modules for assembly during production. Currently, folding mesh frames are generally connected by the interlocking of hubs and rods to form basic rotating support modules. These basic modules are then connected together using connectors to complete the assembly of the folding mesh frame. Existing connectors typically use bolts to connect the hubs of two basic modules. Furthermore, to ensure the stability of the folding mesh frame, assemblers need to exert considerable effort to tighten these bolts. Since there are many assembly points for folding mesh frames, using bolt connections is time-consuming and labor-intensive, easily causing fatigue for assemblers and resulting in a slow assembly speed.

[0003] CN211369763U discloses a semi-rigid prefabricated folding space frame structure, including an arched space frame main body and two arched space frame portals. The arched space frame main body includes an arched space frame base module. Both the arched space frame base module and the arched space frame portals are assembled from hubs and rods. The arched space frame base module and the arched space frame portals, as well as two adjacent arched space frame base modules, are connected by multiple semi-rigid connectors. Multiple hubs on both sides of the arched space frame base module and multiple hubs on one side of the arched space frame portals are equipped with locking components. The folding space frame connects the hubs on the two base modules through semi-rigid connectors and is then locked with locking components consisting of studs and fastening nuts. Assembly is time-consuming and labor-intensive, and assembly personnel are prone to fatigue, resulting in a slow assembly speed for the space frame. Summary of the Invention

[0004] To improve the above situation, the present invention provides a quick locking and limiting device for a folding mesh frame. This device connects the upper and lower hubs of the folding mesh frame by inserting a self-locking steel column into the locking assembly of the upper hub. Under the elastic force of the compression spring, the self-locking steel column is self-locked and limited by steel balls and steel cups.

[0005] The quick locking and limiting device for a folding space frame of the present invention is implemented as follows: The quick locking and limiting device for a folding space frame of the present invention includes an upper hub assembly, a lower hub assembly, a self-locking steel column, and a locking assembly for locking the self-locking steel column.

[0006] The characteristic feature is that the lower hub assembly is disposed at one end of the self-locking steel column, the locking assembly is disposed inside the upper hub assembly, and the other end of the self-locking steel column is inserted into the locking assembly.

[0007] The self-locking steel column has a steel column base plate at one end and a tapered structure at the other end.

[0008] The lower hub assembly consists of a lower hub top plate, a lower hub bottom plate, a bottom plate groove, and a top plate groove.

[0009] The lower hub plate top plate and the lower hub plate bottom plate are connected by fastening bolts. One side of the lower hub plate top plate has a top plate groove in the center, and the lower hub plate bottom plate has a bottom plate groove in the center. The other side of the lower hub plate top plate has a through hole in the center. The bottom plate groove and the top plate groove correspond to each other, forming a placement groove. The through hole and the placement groove are connected. The steel column bottom plate is placed in the placement groove. The self-locking steel column extends out of the through hole in the center of the lower hub plate and away from the lower hub plate top plate.

[0010] The upper hub assembly consists of an upper hub top plate, pre-drilled holes in the top plate, an upper hub bottom plate, a mounting groove, a steel cup groove, steel column guide holes, and a guide groove.

[0011] The upper hub plate and the lower hub plate are connected by fastening bolts, and a mounting groove is opened in the middle of one side of the upper hub plate.

[0012] Preferably, the bottom of the mounting groove has an arc-shaped structure.

[0013] A pre-drilled hole is provided in the center of the other side of the top plate of the upper hub disc, and the pre-drilled hole is connected to the mounting groove.

[0014] Preferably, the other side of the upper hub plate has an arc-shaped structure.

[0015] A steel cup groove is cut into the middle of one side of the upper hub plate, and the opening of the steel cup groove corresponds to the opening of the mounting groove.

[0016] Preferably, the width of the steel bowl groove gradually increases from the bottom to the opening.

[0017] A guide groove is cut into the middle of the bottom of the steel bowl groove.

[0018] A steel column guide hole is opened in the middle of the other side of the upper hub plate. One end of the steel column guide hole is connected to the guide groove.

[0019] Preferably, the inner diameter of the guide hole for the steel column gradually increases from one end to the other.

[0020] The locking assembly consists of a plastic lid, a compression spring, a steel cage, a steel bowl, steel balls, an annular retaining plate, an annular retaining groove, a partition plate, holes in the steel cage, pre-drilled holes in the plastic bowl, pre-drilled holes in the steel bowl, pre-drilled holes in the steel cage, and pre-drilled holes in the partition plate.

[0021] A plastic bowl lid is placed in an installation groove. The plastic bowl lid has a pre-drilled hole that connects to a pre-drilled hole in the top plate.

[0022] The bottom of the steel bowl is placed inside a steel bowl groove, and the rim of the steel bowl is located inside a plastic lid bowl. The rim of the steel bowl is equipped with an annular retaining plate, and the inner wall of the plastic lid bowl has an annular retaining groove corresponding to the annular retaining plate. The annular retaining plate is engaged within the annular retaining groove.

[0023] Preferably, the inner diameter of the steel bowl gradually increases from the bottom to the rim.

[0024] The bottom of the steel bowl has a pre-drilled hole, which is connected to a guide groove.

[0025] The steel cage is slidably placed inside the steel bowl, and the partition plate is placed on top of the steel cage.

[0026] Preferably, the partition plate has a U-shaped structure.

[0027] Preferably, the steel cage is divided into two parts: a bottom plate and three side plates. The three side plates are equidistantly positioned along the edge of the bottom plate. One end of each side plate is connected to the bottom plate, and the other end is connected to a partition plate.

[0028] Preferably, the diameter of the steel cage bottom plate is slightly smaller than the inner diameter of the steel bowl bottom.

[0029] A steel cage opening is formed between two adjacent side plates.

[0030] Preferably, the steel cage opening has a rectangular structure.

[0031] Steel balls are installed inside the holes of the steel cage.

[0032] Preferably, the width of the steel cage hole is slightly larger than the diameter of the steel ball.

[0033] A compression spring is placed inside the partition plate, with one end connected to the bottom plate of the partition plate and the other end in contact with the bottom of the plastic lid bowl.

[0034] Preferably, the centerline of the compression spring and the centerline of the pre-drilled hole in the plastic bowl are on the same straight line.

[0035] The bottom plate of the partition plate has pre-drilled holes for the partition plate.

[0036] Preferably, the center line of the pre-drilled hole in the partition plate and the center line of the compression spring are on the same straight line.

[0037] The bottom of the steel bowl has a pre-drilled hole, which is connected to a guide groove.

[0038] Preferably, the center line of the reserved hole in the steel bowl and the center line of the reserved hole in the partition plate are on the same straight line.

[0039] The bottom plate of the steel cage has pre-drilled holes for the steel cage.

[0040] Preferably, the center line of the reserved hole in the steel cage and the center line of the reserved hole in the partition plate are on the same straight line;

[0041] Furthermore, the partition plate is provided with an unlocking pull rope, the two ends of which are respectively connected to the two side plates of the partition plate, and the top plate of the upper hub plate has a rope hole through which the unlocking pull rope extends to the outside of the upper hub plate.

[0042] Furthermore, a cushioning pad is provided on the top of the plastic bowl. The cushioning pad is made of rubber material and has a circular structure. The diameter of the cushioning pad is larger than the diameter of the pre-drilled hole in the plastic bowl. Beneficial effects

[0043] 1. The upper and lower hubs of the folding grid are connected by self-locking steel columns, and the self-locking steel columns are locked by locking components, eliminating the need for bolt connections and saving time and effort.

[0044] Second, it has a simple structure and is convenient and practical.

[0045] Third, it is low-cost and easy to promote. Attached Figure Description

[0046] Figure 1 This is a three-dimensional structural diagram of a quick locking and limiting device for a folding mesh frame according to the present invention;

[0047] Figure 2 This is a structural schematic diagram of a quick locking and limiting device for a folding mesh frame according to the present invention;

[0048] Figure 3 This is a schematic diagram of the locking assembly of a quick-locking and limiting device for a folding mesh frame according to the present invention;

[0049] Figure 4 This is a schematic diagram of the upper hub assembly of a quick locking and limiting device for a folding mesh frame according to the present invention;

[0050] Figure 5 This is a structural schematic diagram of a quick locking and limiting device for a folding mesh frame according to the present invention, which only shows the structure of the plastic lid bowl.

[0051] Figure 6 This is a structural schematic diagram of a quick locking and limiting device for a folding mesh frame according to the present invention, which only shows the structure of the steel bowl.

[0052] Figure 7This is a structural schematic diagram of a quick locking and limiting device for a folding mesh frame according to the present invention, which only shows the structure of the steel cage.

[0053] Figure 8 This is a schematic diagram of the structure of Embodiment 2 of the quick locking and limiting device for a folding mesh frame according to the present invention;

[0054] Figure 9 This is a schematic diagram of the structure of Embodiment 3 of the quick locking and limiting device for a folding mesh frame according to the present invention.

[0055] Attached Figure

[0056] The components are: upper hub plate top plate (1), top plate reserved hole (2), upper hub plate bottom plate (3), self-locking steel column (4), lower hub plate top plate (5), lower hub plate bottom plate (6), mounting groove (7), plastic cover cup (8), compression spring (9), steel cage (10), steel cup (11), steel column bottom plate (12), bottom plate groove (13), top plate groove (14), steel ball (15), annular card plate (16), annular card groove (17), partition plate (18), steel cage hole (19), steel cup groove (20), steel column guide hole (21), guide groove (22), plastic cup reserved hole (23), steel cup reserved hole (24), steel cage reserved hole (25), partition plate reserved hole (26), unlocking pull rope (27), buffer pad (28). Detailed Implementation Example 1

[0057] The present invention provides a quick locking and limiting device for a folding grid frame, comprising an upper hub assembly, a lower hub assembly, a self-locking steel column (4), and a locking assembly for locking the self-locking steel column (4).

[0058] The feature is that the lower hub assembly is disposed at one end of the self-locking steel column (4), the locking assembly is disposed inside the upper hub assembly, and the other end of the self-locking steel column (4) is inserted into the locking assembly.

[0059] One end of the self-locking steel column (4) is provided with a steel column base plate (12), and the other end of the self-locking steel column (4) is a conical structure.

[0060] The lower hub assembly consists of a lower hub top plate (5), a lower hub bottom plate (6), a bottom plate groove (13), and a top plate groove (14).

[0061] The lower hub plate top plate (5) and the lower hub plate bottom plate (6) are connected by fastening bolts. The lower hub plate top plate (5) has a top plate groove (14) in the middle of one side, and the lower hub plate bottom plate (6) has a bottom plate groove (13) in the middle of the middle. The lower hub plate top plate (5) has a through hole in the middle of the other side. The bottom plate groove (13) and the top plate groove (14) correspond to each other and form a placement groove. The through hole and the placement groove are connected. The steel column bottom plate (12) is placed in the placement groove. The self-locking steel column (4) extends out of the through hole in the middle of the lower hub plate top plate (5) and moves away from the lower hub plate top plate (5).

[0062] The upper hub assembly consists of an upper hub top plate (1), a pre-drilled hole (2) in the top plate, an upper hub bottom plate (3), a mounting groove (7), a steel cup groove (20), a steel column guide hole (21), and a guide groove (22).

[0063] The upper hub plate (1) and the upper hub plate (3) are connected by fastening bolts, and an installation groove (7) is opened in the middle of one side of the upper hub plate (1).

[0064] Preferably, the bottom of the mounting groove (7) has an arc-shaped structure.

[0065] A pre-drilled hole (2) is provided in the middle of the other side of the top plate (1) of the upper hub disc. The pre-drilled hole (2) is connected to the mounting groove (7).

[0066] Preferably, the other side of the upper hub plate (1) has an arc-shaped structure.

[0067] A steel cup groove (20) is opened in the middle of one side of the upper hub plate (3), and the groove opening of the steel cup groove (20) corresponds to the groove opening of the mounting groove (7).

[0068] Preferably, the width of the steel bowl groove (20) gradually increases from the bottom to the opening.

[0069] The steel bowl groove (20) has a guide groove (22) in the middle of the bottom.

[0070] A steel column guide hole (21) is opened in the middle of the other side of the upper hub plate (3). One end of the steel column guide hole (21) is connected to the guide groove (22).

[0071] Preferably, the inner diameter of the steel column guide hole (21) gradually increases from one end to the other.

[0072] The locking assembly consists of a plastic cup (8), a compression spring (9), a steel cage (10), a steel cup (11), a steel ball (15), an annular retaining plate (16), an annular retaining groove (17), a partition plate (18), a steel cage hole (19), a plastic cup reserved hole (23), a steel cup reserved hole (24), a steel cage reserved hole (25), and a partition plate reserved hole (26).

[0073] A plastic bowl (8) is placed in the mounting groove (7). The plastic bowl (8) has a pre-drilled hole (23) for the plastic bowl, which is connected to the pre-drilled hole (2) in the top plate.

[0074] The bottom of the steel bowl (11) is placed in the steel bowl groove (20), and the mouth of the steel bowl (11) is located inside the plastic lid bowl (8). The mouth of the steel bowl (11) is provided with an annular retaining plate (16), and the inner wall of the plastic lid bowl (8) is provided with an annular retaining groove (17) corresponding to the annular retaining plate (16). The annular retaining plate (16) is engaged in the annular retaining groove (17).

[0075] Preferably, the inner diameter of the steel bowl (11) gradually increases from the bottom to the rim.

[0076] The steel bowl (11) has a pre-drilled hole (24) at the bottom, and the pre-drilled hole (24) is connected to the guide groove (22).

[0077] The steel cage (10) is slidably placed inside the steel bowl (11), and the partition plate (18) is placed on the steel cage (10).

[0078] Preferably, the partition plate (18) has a U-shaped structure.

[0079] Preferably, the steel cage (10) is divided into two parts: a bottom plate and a side plate. There are three side plates, which are equidistantly placed at the edge of the bottom plate. One end of each side plate is connected to the bottom plate, and the other end is connected to the partition plate (18).

[0080] Preferably, the diameter of the bottom plate of the steel cage (10) is slightly smaller than the inner diameter of the bottom of the steel bowl (11).

[0081] A steel cage opening (19) is formed between two adjacent side plates.

[0082] Preferably, the steel cage opening (19) has a rectangular structure.

[0083] Steel balls (15) are placed inside the holes (19) of the steel cage.

[0084] Preferably, the width of the steel cage hole (19) is slightly larger than the diameter of the steel ball (15).

[0085] A compression spring (9) is placed inside the partition plate (18). One end of the compression spring (9) is connected to the bottom plate of the partition plate (18), and the other end is in contact with the bottom of the plastic lid bowl (8).

[0086] Preferably, the centerline of the compression spring (9) and the centerline of the pre-drilled hole (23) in the plastic bowl are on the same straight line.

[0087] The bottom plate of the partition plate (18) has a partition plate reserved hole (26).

[0088] Preferably, the centerline of the pre-drilled hole (26) in the partition plate and the centerline of the compression spring (9) are on the same straight line.

[0089] The steel bowl (11) has a pre-drilled hole (24) at the bottom, and the pre-drilled hole (24) is connected to the guide groove (22).

[0090] Preferably, the center line of the reserved hole (24) in the steel bowl and the center line of the reserved hole (26) in the partition plate are on the same straight line.

[0091] The bottom plate of the steel cage (10) has a pre-drilled hole (25).

[0092] Preferably, the center line of the reserved hole (25) of the steel cage and the center line of the reserved hole (26) of the partition plate are on the same straight line;

[0093] Preferably, the self-locking steel column (4) is made of stainless steel. Stainless steel, as defined in GB / T20878-2007, is steel with rust resistance and corrosion resistance as its main characteristics, and has a chromium content of at least 10.5% and a carbon content of no more than 1.2%.

[0094] Preferably, the steel bowl (11) is made of stainless steel.

[0095] In use, initially, the steel cage (10) is located at the bottom of the steel bowl (11), and the compression spring (9) is in a slightly compressed state. The other end of the self-locking steel column (4) is inserted into the three steel balls (15) inside the steel cage (10) through the steel column guide hole (21), guide groove (22), steel bowl reserved hole (24), and steel cage reserved hole (25) in sequence. The self-locking steel column (4) is pushed forward. Under the push of the conical surface at the other end of the self-locking steel column (4), the steel balls (15) roll upward in the steel cage hole (19). After reaching the partition plate (18), they drive the steel cage (10) and the partition plate (18) to move in the steel bowl (11). 1) Slide inwards while compressing the compression spring (9). When the compression spring (9) reaches a large compression state, it stops compressing. Under the combined action of the cone surface reaction force of the self-locking steel column (4), the inner wall reaction force of the steel bowl (11), and the downward pressure of the partition plate (18), and under the limit of the steel cage hole (19), the steel ball (15) remains relatively stationary and continues to advance the self-locking steel column (4). The other end of the self-locking steel column (4) passes through the partition plate reserved hole (26), the compression spring (9), the plastic bowl reserved hole (23), and the top plate reserved hole (2) in sequence and moves upwards. The column body of the self-locking steel column (4) and the steel When the ball (15) comes into contact with the self-locking steel column (4), the partition plate (18), and the inner wall of the steel bowl (11), the ball (15) remains in contact with the self-locking steel column (4). Simultaneously, due to the friction of the self-locking steel column (4), the ball (15) continues to rotate as the self-locking steel column (4) is inserted. The horizontal distance between the three balls (15) gradually increases to its maximum and remains in this state. The compression spring (9) is in a compressed state, ensuring that the partition plate (18) always exerts downward pressure on the ball (15). If the self-locking steel column (4) is pulled out, it will inevitably cause the ball (15) to rotate slightly downwards in the opposite direction. As the ball rolls, the horizontal spacing between the three steel balls (15) will decrease, meaning that the steel balls (15) will be pressed more firmly between the self-locking steel column (4) and the steel bowl (11), and the degree of compaction will increase as the pull-out force of the self-locking steel column (4) increases. Then the pressure between the steel balls (15) and the self-locking steel column (4) will increase infinitely, which will lead to an infinite increase in static friction. The combined force of the upward static friction of the three steel balls (15) and the self-locking steel column (4) can cancel out the downward pull-out force of the self-locking steel column (4), thereby achieving the removal and locking of the self-locking steel column (4) and realizing the stable connection between the upper hub assembly and the lower hub assembly.

[0096] When disassembly is required, simply place the magnet above the device and use the magnetic attraction to move the steel ball (15) and the steel cage (10) upwards, increasing the distance between the steel ball (15), and then pull out the self-locking steel column (4). Example 2

[0097] The difference between this embodiment and embodiment 1 is that: the partition plate (18) is provided with an unlocking pull rope (27), the two ends of the unlocking pull rope (27) are respectively connected to the two side plates of the partition plate (18), the top plate (1) of the upper hub plate has a rope hole, and the unlocking pull rope (27) extends to the outside of the upper hub plate through the rope hole; when in use, when disassembly is required, simply pull the unlocking pull rope (27) to move the steel ball (15) and the steel cage (10) upward, so that the distance between the steel ball (15) increases, and then pull out the self-locking steel column (4), without the need to carry an additional magnetic suction device, making it more convenient to use; Example 3

[0098] The difference between this embodiment and embodiment 1 is that: the top of the plastic bowl (8) is provided with a buffer pad (28), the buffer pad (28) is made of rubber material, the buffer pad (28) is a circular structure, and the diameter of the buffer pad (28) is larger than the diameter of the reserved hole (23) of the plastic bowl; when in use, the buffer pad (28) can buffer and limit the self-locking steel column (4) when it is inserted, preventing the self-locking steel column (4) from being inserted too quickly so that the steel ball (15) cannot reach the locking position and thus affect the stability of the folding frame;

[0099] The design of the bottom plate of the steel cage (10) having a diameter slightly smaller than the inner diameter of the bottom of the steel bowl (11) enables the partition plate (18) and the side wall of the bottom of the steel bowl (11) to limit the steel ball (15) under the slight compression reaction force of the compression spring (9) in the initial state, thus preventing the steel ball (15) from leaking out.

[0100] The design of the steel bowl groove (20) with its width gradually increasing from the bottom to the opening can adapt to the shape of the steel bowl (11), making it easier for the steel bowl (11) to be installed in the steel bowl groove (20);

[0101] The design of the inner diameter of the steel column guide hole (21) gradually increasing from one end to the other can guide the self-locking steel column (4) so ​​that the self-locking steel column (4) can be inserted between the three steel balls (15) in the steel cage (10).

[0102] The design of the steel cage hole (19) being slightly wider than the diameter of the steel ball (15) facilitates the filling of the steel ball (15) and does not obstruct the contact between the steel column and the inner wall of the steel bowl (11) during the insertion of the self-locking steel column (4).

[0103] The design of the inner diameter of the steel bowl (11) gradually increases from the bottom to the mouth of the bowl. After the horizontal distance between the three steel balls (15) reaches the maximum, it can cooperate with the self-locking steel column (4) to form a self-locking structure, thereby realizing a stable connection between the upper hub plate assembly and the lower hub plate assembly.

[0104] The purpose of connecting the upper and lower hubs of the folding frame by inserting the self-locking steel column (4) into the locking assembly of the upper hub is achieved. Under the elastic force of the compression spring (9), the steel ball (15) and the steel cup (11) lock the self-locking steel column (4) in place.

[0105] It should be noted that, unless otherwise explicitly specified and limited, the terms "placed," "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to fixed connections such as folded joints, riveted joints, pin joints, adhesive joints, and welded joints; detachable connections such as threaded joints, snap-fit ​​joints, and hinged joints; integral connections; electrical connections; direct connections; or indirect connections via an intermediate medium; or internal connections between two components. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0106] The above embodiments are preferred embodiments of the present invention. To save space, the applicant has not added other embodiments, but this is not intended to limit the scope of the present invention. Any person skilled in the art can make some modifications without departing from the scope of the present invention; that is, all equivalent modifications made in accordance with the present invention should be covered by the scope of the present invention.

Claims

1. A quick-locking and limiting device for a folding space frame, comprising an upper hub assembly, a lower hub assembly, a self-locking steel column, and a locking assembly for locking the self-locking steel column, characterized in that: The lower hub assembly is located at one end of the self-locking steel column, and the locking assembly is located inside the upper hub assembly. The other end of the self-locking steel column is inserted into the locking assembly. The locking assembly consists of a plastic cup, a compression spring, a steel cage, a steel cup, steel balls, an annular retaining plate, an annular retaining groove, a partition plate, a steel cage hole, a pre-drilled hole in the plastic cup, a pre-drilled hole in the steel cup, a pre-drilled hole in the steel cage, and a pre-drilled hole in the partition plate. The plastic cup is placed in the mounting groove, and the plastic cup has a pre-drilled hole. The steel bowl is connected to the pre-drilled hole in the top plate. The bottom of the steel bowl is placed in the steel bowl groove, and the mouth of the steel bowl is located inside the plastic lid bowl. The mouth of the steel bowl is provided with an annular retaining plate. The inner wall of the plastic lid bowl has an annular retaining groove corresponding to the annular retaining plate. The annular retaining plate is engaged in the annular retaining groove. The bottom of the steel bowl has a pre-drilled hole, which is connected to a guide groove. The steel cage is slidably placed inside the steel bowl. A partition plate is placed on the steel cage. The partition plate has a U-shaped structure. The steel cage is divided into two parts, one part being... The base plate consists of three side plates, equidistantly positioned along its edge. One end of each side plate connects to the base plate, and the other end connects to a partition plate. A rectangular steel cage opening is formed between adjacent side plates, containing steel balls. A compression spring is placed within the partition plate, with one end connected to the partition plate's base and the other end contacting the bottom of the plastic lid bowl. The centerline of the compression spring and the centerline of the pre-drilled hole in the plastic lid bowl are aligned. A pre-drilled hole is also present on the partition plate's base, with its centerline aligned with the compression spring's centerline. A pre-drilled hole is also present on the bottom of the steel lid bowl, connecting to a guide groove. The centerline of this pre-drilled hole is aligned with the centerline of the partition plate's pre-drilled hole. Finally, a pre-drilled hole is present on the steel cage's base, with its centerline aligned with the centerline of the partition plate's pre-drilled hole.

2. The quick locking and limiting device for a folding mesh frame according to claim 1, characterized in that... The self-locking steel column has a steel column base plate at one end and a conical structure at the other end.

3. The quick locking and limiting device for a folding mesh frame according to claim 1, characterized in that... The lower hub assembly consists of a lower hub top plate, a lower hub bottom plate, a bottom plate groove, and a top plate groove. The lower hub top plate and the lower hub bottom plate are connected by fastening bolts. A top plate groove is opened in the middle of one side of the lower hub top plate, and a bottom plate groove is opened in the middle of the lower hub bottom plate. A through hole is opened in the middle of the other side of the lower hub top plate. The bottom plate groove and the top plate groove correspond to each other and form a placement groove. The through hole and the placement groove are connected. The steel column bottom plate is placed in the placement groove. The self-locking steel column extends away from the lower hub top plate from the through hole in the middle of the lower hub top plate.

4. The quick locking and limiting device for a folding mesh frame according to claim 1, characterized in that... The upper hub plate assembly consists of an upper hub plate top plate, a pre-drilled hole in the top plate, an upper hub plate bottom plate, a mounting groove, a steel cup groove, a steel column guide hole, and a guide groove. The upper hub plate top plate and the upper hub plate bottom plate are connected by fastening bolts. The mounting groove is located in the center of one side of the upper hub plate, and the bottom of the mounting groove has an arc-shaped structure. The pre-drilled hole in the top plate is located in the center of the other side of the upper hub plate and is connected to the mounting groove. The other side of the upper hub plate top plate has an arc-shaped structure. The steel cup groove is located in the center of one side of the upper hub plate, and the opening of the steel cup groove corresponds to the opening of the mounting groove. A guide groove is located in the center of the bottom of the steel cup groove. A steel column guide hole is located in the center of the other side of the upper hub plate, and one end of the steel column guide hole is connected to the guide groove.

5. The quick locking and limiting device for a folding mesh frame according to claim 4, characterized in that... The partition plate is equipped with an unlocking pull rope, the two ends of which are connected to the two side plates of the partition plate respectively. The top plate of the upper hub plate has a rope hole, through which the unlocking pull rope extends to the outside of the upper hub plate.

6. The quick locking and limiting device for a folding mesh frame according to claim 1, characterized in that... The top of the plastic bowl is provided with a cushioning pad, which is made of rubber material and has a circular structure. The diameter of the cushioning pad is larger than the diameter of the pre-drilled hole in the plastic bowl.

7. The quick locking and limiting device for a folding mesh frame according to claim 4, characterized in that... The width of the steel bowl groove gradually increases from the bottom to the opening, and the inner diameter of the steel column guide hole gradually increases from one end to the other.

8. The quick locking and limiting device for a folding mesh frame according to claim 1, characterized in that... The inner diameter of the steel bowl gradually increases from the bottom to the rim, and the diameter of the bottom plate of the steel cage is slightly smaller than the inner diameter of the bottom of the steel bowl.

9. A quick locking and limiting device for a folding mesh frame according to claim 1, characterized in that... The width of the steel cage opening is slightly larger than the diameter of the steel ball.

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