A hula hoop assembly machine

Abstract

The application discloses a hula hoop assembling machine, which comprises a rack, a conveying mechanism, a pre-mounting mechanism, a bending mechanism, a butt joint mechanism and a discharging mechanism; the conveying mechanism is arranged on the rack; the pre-mounting mechanism is arranged on one side of the conveying mechanism and is used for inserting one end of an assembling joint into one end of an extruded pipe; the bending mechanism is arranged at a discharging end of the conveying mechanism and is used for bending the extruded pipe into a circular shape; the butt joint mechanism is arranged on one side of the bending mechanism and is used for inserting the other end of the assembling joint into the other end of the extruded pipe to form a hula hoop; and the discharging mechanism is arranged on a side of the butt joint mechanism and is used for moving the assembled hula hoop to one side; the hula hoop assembling machine has high automation degree, high production efficiency, can realize quick and batch hula hoop assembling and has good use effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hula hoop assembly equipment, in particular to a hula hoop assembly machine. BACKGROUND

[0002] Hula hoop, also known as fitness hoop, has become a sport and fitness project suitable for both young and old due to its portability, beauty, and small space occupation. Skilled people can obtain better exercise and development of waist and abdominal muscles, hip muscles, and leg muscles, and effectively improve the flexibility and flexibility of human waist, hip, and knee joints. In addition to being used as general fitness equipment, hula hoop is often used for competition, acrobatic performance, or weight loss. Currently, the existing hula hoop is usually assembled by hand. First, some sand particles are poured into the extrusion pipe, and then the extrusion pipe is bent to make both ends of the extrusion pipe respectively connected with the connecting head. This manual hula hoop assembly method has low production efficiency, is difficult to realize rapid and batch hula hoop assembly, and is difficult to meet the needs of industrial production. SUMMARY

[0003] The present application aims to provide a hula hoop assembly machine. When the hula hoop assembly machine is used, the extrusion pipe is first placed in the clamping groove on the conveying belt. When the extrusion pipe is conveyed to the sand filling mechanism, a certain amount of sand particles is filled from one end of the extrusion pipe. When the extrusion pipe filled with sand particles is conveyed from the conveying belt to the pre-installation mechanism, one side end of the assembly connector is inserted into one end of the extrusion pipe through the pre-installation mechanism. When the extrusion pipe of the assembly connector is conveyed to the bending mechanism, the extrusion pipe is bent into a circular shape through the bending mechanism. Then, the other side end of the assembly connector is inserted into the other end of the extrusion pipe through the butt joint mechanism to form a hula hoop. Finally, the assembled hula hoop is moved to the hanging rod on one side through the discharging mechanism, which has high automation degree, high production efficiency, can realize rapid and batch hula hoop assembly, and has good use effect.

[0004] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0005] A hula hoop assembly machine comprises a rack, a conveying mechanism, a pre-installation mechanism, a bending mechanism, a butt joint mechanism, and a discharging mechanism. The conveying mechanism is arranged on the rack. The pre-installation mechanism is arranged on one side of the conveying mechanism, and one side end of the assembly connector is inserted into one end of the extrusion pipe through the pre-installation mechanism. The bending mechanism is arranged at the discharging end of the conveying mechanism, and the extrusion pipe is bent into a circular shape through the bending mechanism. The butt joint mechanism is arranged on one side of the bending mechanism, and the other side end of the assembly connector is inserted into the other end of the extrusion pipe through the butt joint mechanism to form a hula hoop. The discharging mechanism is arranged on the side of the butt joint mechanism, and the assembled hula hoop is moved to one side through the discharging mechanism.

[0006] Preferably, the pre-installation mechanism comprises a vibrating feeding disc, a gripping member, a feeding member and a pushing member; the vibrating feeding disc is fixed outside the conveying mechanism; the gripping member comprises a gripping cylinder and a gripping mechanical claw; the gripping cylinder is fixed on the rack, the gripping mechanical claw is fixed on the telescopic rod of the gripping cylinder, the gripping cylinder drives the gripping mechanical claw to move and grips the side of the extrusion pipe through the gripping mechanical claw; the feeding member comprises a feeding cylinder and a feeding plate; the feeding cylinder is fixedly connected with the rack, and the feeding plate is fixed on the telescopic rod of the feeding cylinder; the upper end of the feeding plate is provided with a discharging groove, and a blocking plate is fixed on the feeding plate below the discharging groove; the discharging groove is located at the outlet of the feeding pipe of the vibrating feeding disc, and after the assembly joint enters the discharging groove, the assembly joint is moved to be flush with one side end of the gripped extrusion pipe through the gripping cylinder; the pushing member comprises a pushing cylinder and a pushing rod; the pushing cylinder is fixed on the rack, the pushing rod is fixed on the telescopic rod of the pushing cylinder, and the pushing cylinder drives the pushing rod to move to insert one side end of the assembly joint into one end of the extrusion pipe.

[0007] Preferably, the bending mechanism comprises a forming plate and two bending units oppositely arranged on both sides of the forming plate; the forming plate is fixed on the rack above the conveying mechanism; the bending unit comprises a bending motor, a swing arm and a bending pulley; the bending motor is fixedly connected with the rack; the inner end of the swing arm is fixedly connected with the side wall of the output shaft of the bending motor, and the outer end of the swing arm is rotationally connected with the bending pulley; the outer edge of the bending pulley is provided with a bending groove, and after the extrusion pipe moves above the bending pulley, the bending pulley on the swing arm is swung upward by the bending motor to bend the extrusion pipe on the outer edge of the forming plate.

[0008] Preferably, the docking mechanism comprises two docking units oppositely arranged on the upper end of the forming plate; the docking unit comprises a docking mechanical claw, a first cylinder and a second cylinder; the docking mechanical claw is arranged on the telescopic rod of the first cylinder, and the first cylinder drives the docking mechanical claw to move forward and grips the side end of the extrusion pipe through the docking mechanical claw; the second cylinder is fixedly connected with the rack, and the first cylinder is fixed on the telescopic rod of the second cylinder; the second cylinder drives the first cylinder to move transversely to insert the other side end of the assembly joint into the other end of the extrusion pipe to complete the docking and form a hula hoop.

[0009] Preferably, the discharging mechanism comprises a horizontal moving mechanism, a sliding rod, a discharging cylinder and a discharging mechanical claw; one side of the upper end of the rack is fixedly provided with a hanging rod; the horizontal moving mechanism is fixed on the rack; the sliding rod is slidingly arranged on the rack and connected with the horizontal moving mechanism, and the horizontal moving mechanism drives the sliding rod to move left and right; the discharging cylinder is fixed on the lower end of the sliding rod; the discharging mechanical claw is arranged on the telescopic rod of the discharging cylinder, and the discharging cylinder drives the discharging mechanical claw to move forward and backward and grips or places the assembled hula hoop through the discharging mechanical claw on the hanging rod.

[0010] Preferably, the conveying mechanism comprises a driving roller, a driven roller, a conveying motor and two conveying belts; the driving roller and the driven roller are respectively rotationally connected to the frame; the output shaft of the conveying motor is connected to the driving roller; the conveying belts are sleeved on the driving roller and the driven roller and are moved by the conveying motor; the conveying belts are provided with clamping grooves at intervals; and the extrusion pipe is placed in the clamping grooves of the two conveying belts.

[0011] Preferably, the frame at the feeding end of the conveying mechanism is provided with a pipe storage groove for placing the extrusion pipe.

[0012] Preferably, the conveying mechanism at the feeding end of the pre-assembly mechanism is provided with a sand filling mechanism; the sand filling mechanism comprises a discharging machine, a gripping member and a poking member; the gripping member comprises a gripping cylinder and a gripping mechanical claw; the gripping cylinder is fixed to the frame, the gripping mechanical claw is fixed to the telescopic rod of the gripping cylinder, the gripping cylinder drives the gripping mechanical claw to move and grips the inside of one end of the extrusion pipe through the gripping mechanical claw; the poking member comprises a sliding block, a poking pulley, a lead screw and a poking motor; the sliding block is slidingly connected to the frame, and the poking pulley is rotationally arranged on the upper end of the sliding block; the outer edge of the poking pulley is provided with a poking groove; the lead screw is rotationally connected to the frame, and the sliding block is threadedly connected to the lead screw; the poking motor is fixed to the frame, and the output shaft of the poking motor is fixedly connected to the lead screw; the poking motor drives the poking pulley to move obliquely upward, so that one end of the extrusion pipe is bent upward to fill the sand in the sand pipe of the discharging machine.

[0013] Preferably, the middle part of the assembly joint is provided with a limiting protrusion, and the end part of the extrusion pipe is tightly abutted against the side part of the limiting protrusion.

[0014] After the above technical scheme is adopted, the hula hoop assembly machine has the following beneficial effects: when the hula hoop assembly machine is used, the extrusion pipe is first placed in the clamping groove on the conveying belt, a certain amount of sand is filled in one end of the extrusion pipe when the extrusion pipe is conveyed to the sand filling mechanism; when the extrusion pipe after filling sand is conveyed from the conveying belt to the pre-assembly mechanism, one side end of the assembly joint is inserted into one end of the extrusion pipe through the pre-assembly mechanism; when the extrusion pipe of the assembly joint is conveyed to the bending mechanism, the extrusion pipe is bent into a circle through the bending mechanism, and the other side end of the assembly joint is inserted into the other end of the extrusion pipe through the butt joint mechanism to form a hula hoop; finally, the assembled hula hoop is moved to the hanging rod on one side through the discharging mechanism, so that the degree of automation is high, the production efficiency is high, the hula hoop can be quickly and batch assembled, and the use effect is good. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a perspective structural schematic view of the present application;

[0016] Figure 2 is a structural schematic view of the conveying mechanism of the present application;

[0017] Figure 3 Structure diagram of the gripping member of the present application;

[0018] Figure 4 Structure diagram of the pushing member of the present application;

[0019] Figure 5 Structure diagram of the pre-mounting mechanism of the present application;

[0020] Figure 6 Structure diagram of the bending mechanism and the docking mechanism of the present application; Figure 5 Partial enlarged view of part A in the figure;

[0021] Figure 7 Structure diagram of the bending mechanism and the docking mechanism of the present application;

[0022] Figure 8 Structure diagram of the bending mechanism and the docking mechanism of the present application;

[0023] Figure 9 Structure diagram of the discharging mechanism of the present application.

[0024] The reference signs in the figure represent:

[0025] 1, frame; 10, hanging rod; 11, storage pipe groove; 2, conveying mechanism; 20, driving roller; 21, driven roller; 22, conveying motor; 23, conveying belt; 230, clamping groove; 3, pre-mounting mechanism; 30, vibrating feeding disc; 300, feeding pipe; 31, gripping member; 310, gripping cylinder; 311, gripping mechanical claw; 32, feeding member; 320, feeding cylinder; 321, feeding plate; 322, discharging groove; 323, blocking plate; 33, pushing member; 330, pushing cylinder; 331, pushing rod; 4, bending mechanism; 40, forming plate; 41, bending unit; 410, bending motor; 411, swing arm; 412, bending pulley; 413, bending groove; 5, docking mechanism; 50, docking unit; 500, docking mechanical claw; 501, first cylinder; 502, second cylinder; 6, discharging mechanism; 60, horizontal moving mechanism; 61, sliding rod; 62, discharging cylinder; 63, discharging mechanical claw; 7, assembly joint; 70, limiting protrusion; 8, extruded pipe; 9, sand granule filling mechanism; 90, discharging machine; 900, sand discharging pipe; 91, gripping member; 910, gripping cylinder; 911, gripping mechanical claw; 92, pushing member; 920, sliding block; 921, pushing pulley; 922, screw rod; 923, pushing motor; 924, pushing groove. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the present application more clear and explicit, the present application is further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application, and are not used to limit the present application.

[0027] Referring to Figures 1 to 9 , a hula hoop assembly machine comprises a frame 1, a conveying mechanism 2, a pre-assembly mechanism 3, a bending mechanism 4, a butt joint mechanism 5 and a discharging mechanism 6; the conveying mechanism 2 is arranged on the frame 1; the pre-assembly mechanism 3 is arranged on one side of the conveying mechanism 2, and one end of an assembly joint 7 is inserted into one end of an extruded pipe 8 through the pre-assembly mechanism 3; the bending mechanism 4 is arranged at the discharging end of the conveying mechanism 2, and the extruded pipe 8 is bent into a circle through the bending mechanism 4; the butt joint mechanism 5 is arranged on one side of the bending mechanism 4, and the other end of the assembly joint 7 is inserted into the other end of the extruded pipe 8 through the butt joint mechanism 5 to form a hula hoop; and the discharging mechanism 6 is arranged on the side of the butt joint mechanism 5, and the assembled hula hoop is moved to one side through the discharging mechanism 6.

[0028] As Figure 1 , Figure 5 and Figure 6 shown, the pre-assembly mechanism 3 comprises a vibrating feeding disc 30, a clamping member 31, a feeding member 32 and a pushing member 33; the vibrating feeding disc 30 is fixed to the outside of the conveying mechanism 2; the clamping member 31 comprises a clamping cylinder 310 and a clamping mechanical gripper 311; the clamping cylinder 310 is fixed to the frame 1, the clamping mechanical gripper 311 is fixed to the telescopic rod of the clamping cylinder 310, the clamping cylinder 310 drives the clamping mechanical gripper 311 to move and clamps the side of the extruded pipe 8 through the clamping mechanical gripper 311; the feeding member 32 comprises a feeding cylinder 320 and a feeding plate 321; the feeding cylinder 320 is fixedly connected with the frame 1, and the feeding plate 321 is fixed to the telescopic rod of the feeding cylinder 320; a discharging groove 322 is arranged on the upper end of the feeding plate 321, and a blocking plate 323 is fixed to the feeding plate 321 below the discharging groove 322; the discharging groove 322 is located at the outlet of a feeding pipe 300 of the vibrating feeding disc 30, and after the assembly joint 7 enters the discharging groove 322, the clamping cylinder 310 drives the assembly joint 7 to move to be flush with the clamped one end of the extruded pipe 8; the pushing member 33 comprises a pushing cylinder 330 and a pushing rod 331; the pushing cylinder 330 is fixed to the frame 1, and the pushing rod 331 is fixed to the telescopic rod of the pushing cylinder 330, and the pushing cylinder 330 drives the pushing rod 331 to move to insert one end of the assembly joint 7 into one end of the extruded pipe 8.

[0029] As Figure 1 , Figure 7 and Figure 8As shown in the figures, the bending mechanism 4 comprises a shaping plate 40 and two bending units 41 arranged on both sides of the shaping plate 40; the shaping plate 40 is fixed on the rack 1 above the conveying mechanism 2; the bending unit 41 comprises a bending motor 410, a swing arm 411 and a bending pulley 412; the bending motor 410 is fixedly connected with the rack 1; the inner end of the swing arm 411 is fixedly connected with the side wall of the output shaft of the bending motor 410, and the outer end of the swing arm 411 is rotatably connected with the bending pulley 412; the outer edge of the bending pulley 412 is provided with a bending groove 413, and after the extrusion pipe 8 moves above the bending pulley 412, the bending pulley 412 on the swing arm 411 is driven by the bending motor 410 to swing upward to bend the extrusion pipe 8 outside the outer edge of the shaping plate 40.

[0030] As shown in the figures, Figure 1 , Figure 7 and Figure 8 , the docking mechanism 5 comprises two docking units 50 arranged on the upper end of the shaping plate 40; the docking unit 50 comprises a docking mechanical gripper 500, a first air cylinder 501 and a second air cylinder 502; the docking mechanical gripper 500 is arranged on the telescopic rod of the first air cylinder 501, the first air cylinder 501 drives the docking mechanical gripper 500 to move forward and clamps the side end of the extrusion pipe 8 through the docking mechanical gripper 500; the second air cylinder 502 is fixedly connected with the rack 1, and the first air cylinder 501 is fixedly connected with the telescopic rod of the second air cylinder 502, so that the first air cylinder 501 is driven by the second air cylinder 502 to move transversely to insert the other side end of the assembly joint 7 into the other end of the extrusion pipe 8 to complete the docking to form a hula hoop.

[0031] As shown in the figures, Figure 1 and Figure 9 , the discharging mechanism 6 comprises a horizontal moving mechanism 60, a slide rod 61, a discharging air cylinder 62 and a discharging mechanical gripper 63; one side of the upper end of the rack 1 is fixedly provided with a hanging rod 10; the horizontal moving mechanism 60 is fixedly arranged on the rack 1; the slide rod 61 is slidably arranged on the rack 1, and the slide rod 61 is connected with the horizontal moving mechanism 60, so that the slide rod 61 is driven by the horizontal moving mechanism 60 to move left and right; the discharging air cylinder 62 is fixedly arranged on the lower end of the slide rod 61; the discharging mechanical gripper 63 is arranged on the telescopic rod of the discharging air cylinder 62, and the discharging air cylinder 62 drives the discharging mechanical gripper 63 to move forward and backward and clamps or releases the assembled hula hoop through the discharging mechanical gripper 63.

[0032] As shown in the figures, Figure 1 and Figure 2As shown, the conveying mechanism 2 includes a driving roller 20, a driven roller 21, a conveying motor 22 and two conveying belts 23; the driving roller 20 and the driven roller 21 are respectively rotatably connected with the rack 1; the output shaft of the conveying motor 22 is connected with the driving roller 20; the conveying belts 23 are sleeved on the driving roller 20 and the driven roller 21, and are driven to move by the conveying motor 22; the conveying belts 23 are provided with clamping grooves 230 at intervals, and the extrusion pipe 8 is placed in the clamping grooves 230 of the two conveying belts 23.

[0033] As shown in Figure 1 and Figure 2 As shown, the rack 1 at the feeding end of the conveying mechanism 2 is provided with a pipe storage groove 11 for placing the extrusion pipe 8.

[0034] As shown in Figure 1 , Figure 3 and Figure 4 As shown, the conveying mechanism 2 at the feeding end of the pre-installation mechanism 3 is provided with a sand filling mechanism 9 on one side; the sand filling mechanism 9 includes a discharging machine 90, a gripping member 91 and a poking member 92; the gripping member 91 includes a gripping cylinder 910 and a gripping mechanical gripper 911; the gripping cylinder 910 is fixed on the rack 1, the gripping mechanical gripper 911 is fixed on the telescopic rod of the gripping cylinder 910, the gripping cylinder 910 drives the gripping mechanical gripper 911 to move and grips the inside of one end of the extrusion pipe 8 through the gripping mechanical gripper 911; the poking member 92 includes a sliding block 920, a poking pulley 921, a lead screw 922 and a poking motor 923; the sliding block 920 is slidably connected with the rack 1, and the poking pulley 921 is rotatably arranged on the upper end of the sliding block 920; the poking pulley 921 is provided with a poking groove 924 on the outer edge; the lead screw 922 is rotatably connected with the rack 1, and the sliding block 920 is threadedly connected with the lead screw 922; the poking motor 923 is fixed on the rack 1, and the output shaft of the poking motor 923 is fixedly connected with the lead screw 922, so that the poking motor 923 drives the poking pulley 921 to move obliquely upward, and one end of the extrusion pipe 8 is bent upward to fill sand particles into the sand discharging pipe 900 of the discharging machine 90.

[0035] As shown in Figure 6 As shown, the middle part of the assembly joint 7 is provided with a limiting protrusion 70, and the end part of the extrusion pipe 8 is tightly abutted against the side part of the limiting protrusion 70.

[0036] It can be understood that "multiple" in the present disclosure refers to two or more, and other quantifiers are similar. The association relationship of "and / or" describing the associated objects means that there can be three relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. The character " / " generally represents that the associated objects before and after are in an "or" relationship. The singular forms "a", "said" and "the" are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0037] It should also be understood that, unless specifically stated otherwise, references to a singular include an embodiment with plural referents. For example, reference to "a cell" includes embodiments having "a plurality of cells".

[0038] It should be further understood that the terms "center", "longitudinal", "lateral", "front", "back", "up", "down", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate directions or positions based on the orientations shown in the drawings and are used for convenience in describing the present embodiments and the principles of the disclosure, and are not meant to limit or confine the scope of the disclosure to only the orientations shown in the drawings.

[0039] It should be further understood that, unless specifically stated otherwise, "connected" or "coupled" or "linked" or "in communication" or the like means that two or more elements are in direct contact or indirect contact with one another.

[0040] It should be further understood that, although the operations of some embodiments are described in a particular, sequential order for convenient presentation, unless specifically stated, certain operations can be performed in an order other than that described, can be performed concurrently, or can be performed at a different point in time, without departing from the scope of the present disclosure.

[0041] Other embodiments of the present disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the present disclosure cover any and all variations of the application that come within the scope of the following claims. The specification and examples given herein are to be considered exemplary only, and the true scope and spirit of the application is indicated by the following claims.

[0042] The above description is only preferred embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A hula hoop assembly machine characterized by: The utility model provides an automatic production line of hula hoop, including frame (1), conveying mechanism (2), preinstallation mechanism (3), bending mechanism (4), butt joint mechanism (5) and discharge mechanism (6), conveying mechanism (2) is set up on frame (1), preinstallation mechanism (3) is set up in conveying mechanism (2) one side, and the one side end of assembly joint (7) is inserted into one end of extrusion pipe (8) through preinstallation mechanism (3), bending mechanism (4) is set up in the discharge end of conveying mechanism (2), and the extrusion pipe (8) is bent into a circle through bending mechanism (4), butt joint mechanism (5) is set up in bending mechanism (4) one side, and the other side end of assembly joint (7) is inserted into the other end of extrusion pipe (8) and forms hula hoop through butt joint mechanism (5), and discharge mechanism (6) is set up in butt joint mechanism (5) side edge, and the hula hoop of assembly is moved to one side through discharge mechanism (6).

2. A hula hoop assembly machine as claimed in claim 1, wherein: The preinstallation mechanism (3) includes vibration feeding disc (30), gripping piece (31), feeding piece (32) and pusher (33), the vibration feeding disc (30) is fixed on the outside of conveying mechanism (2), the gripping piece (31) includes gripping cylinder (310) and gripping mechanical claw (311), the gripping cylinder (310) is fixed on the frame (1), and the gripping mechanical claw (311) is fixed on the telescopic rod of gripping cylinder (310), the gripping cylinder (310) moves and is gripped extrusion pipe (8) side through gripping mechanical claw (311) by gripping cylinder (310) drive gripping mechanical claw (311), the feeding piece (32) includes feeding cylinder (320) and feeding plate (321), the feeding cylinder (320) is fixedly connected with frame (1), and the feeding plate (321) is fixed on the telescopic rod of feeding cylinder (320), the feeding plate (321) upper end is provided with discharging groove (322), and the blocking plate (323) is fixed on the feeding plate (321) below discharging groove (322), the discharging groove (322) is located in the outlet of the feeding pipe (300) of vibration feeding disc (30), and the assembly joint (7) is moved to the side end of the extrusion pipe (8) that is gripped flush through gripping cylinder (310) after entering discharging groove (322), the pusher (33) includes pusher cylinder (330) and pusher rod (331), the pusher cylinder (330) is fixed on the frame (1), and the pusher rod (331) is fixed on the telescopic rod of pusher cylinder (330), and the one side end of assembly joint (7) is inserted into one end of extrusion pipe (8) through pusher cylinder (330) drive pusher rod (331) moves.

3. A hula hoop assembly machine as claimed in claim 2, wherein: The bending mechanism (4) comprises a forming plate (40) and two bending units (41) oppositely arranged on both sides of the forming plate (40); the forming plate (40) is fixed on the rack (1) above the conveying mechanism (2); the bending unit (41) comprises a bending motor (410), a swing arm (411) and a bending pulley (412); the bending motor (410) is fixedly connected with the rack (1); the inner end of the swing arm (411) is fixedly connected with the side wall of the output shaft of the bending motor (410), and the outer end of the swing arm (411) is rotatably connected with the bending pulley (412); the outer edge of the bending pulley (412) is provided with a bending groove (413), after the extrusion pipe (8) moves above the bending pulley (412), the bending pulley (412) on the swing arm (411) is driven by the bending motor (410) to swing upward to bend the extrusion pipe (8) on the outer edge of the forming plate (40).

4. A hula hoop assembly machine as claimed in claim 3, wherein: The docking mechanism (5) comprises two docking units (50) oppositely arranged on the upper end of the forming plate (40); the docking unit (50) comprises a docking mechanical claw (500), a first cylinder (501) and a second cylinder (502); the docking mechanical claw (500) is arranged on the telescopic rod of the first cylinder (501), the first cylinder (501) drives the docking mechanical claw (500) to move forward and clamps the side end of the extrusion pipe (8) through the docking mechanical claw (500); the second cylinder (502) is fixedly connected with the rack (1), the first cylinder (501) is fixed on the telescopic rod of the second cylinder (502), and the first cylinder (501) is driven by the second cylinder (502) to move transversely to insert the other side end of the assembly joint (7) into the other end of the extrusion pipe (8) to complete docking and form a hula hoop.

5. A hula hoop assembly machine as claimed in claim 4, wherein: The discharging mechanism (6) comprises a horizontal moving mechanism (60), a sliding rod (61), a discharging cylinder (62) and a discharging mechanical claw (63); one side of the upper end of the rack (1) is fixedly provided with a hanging rod (10); the horizontal moving mechanism (60) is fixed on the rack (1); the sliding rod (61) is slidably arranged on the rack (1), and the sliding rod (61) is connected with the horizontal moving mechanism (60) and driven by the horizontal moving mechanism (60) to move left and right; the discharging cylinder (62) is fixed on the lower end of the sliding rod (61); the discharging mechanical claw (63) is arranged on the telescopic rod of the discharging cylinder (62), and the discharging cylinder (62) drives the discharging mechanical claw (63) to move forward and backward and clamps or puts the assembled hula hoop on the hanging rod (10) through the discharging mechanical claw (63).

6. A hula hoop assembly machine as claimed in claim 1, wherein: The conveying mechanism (2) comprises a driving roller (20), a driven roller (21), a conveying motor (22) and two conveying belts (23); the driving roller (20) and the driven roller (21) are rotatably connected with the rack (1) respectively; the output shaft of the conveying motor (22) is connected with the driving roller (20); the conveying belts (23) are sleeved on the driving roller (20) and the driven roller (21), and are driven to move by the conveying motor (22); the conveying belts (23) are provided with clamping grooves (230) at intervals, and the extrusion pipe (8) is placed in the clamping grooves (230) of the two conveying belts (23).

7. A hula hoop assembly machine as claimed in claim 6, wherein: The rack (1) at the feeding end of the conveying mechanism (2) is provided with a pipe storage groove (11) for placing the extrusion pipe (8).

8. A hula hoop assembly machine as defined in claim 1, wherein: The sand filling mechanism (9) is arranged on one side of the conveying mechanism (2) at the feeding end of the pre-installation mechanism (3); the sand filling mechanism (9) comprises a discharging machine (90), a gripping member (91) and a pushing member (92); the gripping member (91) comprises a gripping cylinder (910) and a gripping mechanical claw (911); the gripping cylinder (910) is fixed on the rack (1), the gripping mechanical claw (911) is fixed on the telescopic rod of the gripping cylinder (910), the gripping cylinder (910) drives the gripping mechanical claw (911) to move and grips the inside of one end of the extrusion pipe (8) through the gripping mechanical claw (911); the pushing member (92) comprises a sliding block (920), a pushing pulley (921), a lead screw (922) and a pushing motor (923); the sliding block (920) is slidably connected with the rack (1), and the pushing pulley (921) is rotatably arranged on the upper end of the sliding block (920); the pushing pulley (921) is provided with a pushing groove (924) on the outer edge; the lead screw (922) is rotatably connected with the rack (1), and the sliding block (920) is threadedly connected with the lead screw (922); the pushing motor (923) is fixed on the rack (1), and the output shaft of the pushing motor (923) is fixedly connected with the lead screw (922), so that the pushing motor (923) drives the pushing pulley (921) to move upwardly and obliquely, and one end of the extrusion pipe (8) is bent upwardly to fill the sand particles in the sand discharging pipe (900) of the discharging machine (90).

9. A hula hoop assembly machine as defined in claim 1, wherein: The middle part of the assembly joint (7) is provided with a limiting protrusion (70), and the end of the extrusion pipe (8) is tightly abutted against the side of the limiting protrusion (70).

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