Paper cup cylinder returning device for paper cup forming machine

Abstract

The invention discloses a paper cup barrel returning device for a paper cup forming machine, relates to the technical field of paper cup processing equipment, and aims to provide the paper cup barrel returning device for the paper cup forming machine, which can return and convey a cup barrel remotely and can freely and quickly adjust the conveying distance. According to the technical scheme, the paper cup feeding device is characterized by comprising a mounting plate, a supporting frame is arranged on the mounting plate, a paper cup mold is arranged on the side face of the supporting frame, a material returning barrel is arranged at the position, corresponding to the paper cup mold, of the mounting plate, and rotary driving components are arranged at the positions, located on the two sides of the paper cup mold, of the mounting plate. During working, the rotation driving part drives the rubber flywheel to rotate at a high speed, the opening and closing part pushes the rotation driving part to rotate towards the paper cup mold, the rotation driving part drives the rubber flywheel to be attached to the paper cup mold, and a cup cylinder on the paper cup mold is thrown out through the rubber flywheel rotating at the high speed.

Description

Technical Field

[0001] The invention relates to the technical field of paper cup processing equipment, and in particular to a paper cup tube returning device used on a paper cup forming machine. Background Art

[0002] A paper cup is a cup-shaped container made of paper, usually consisting of a cup body, a cup bottom and a cup edge. The cup body is generally made of thicker paper, which has certain strength and toughness, and can bear the weight of the liquid without breaking. It has the advantages of convenience, hygiene, and variety. It is often used for packaging beverages and some snacks. The molding of paper cups includes printing and cutting, winding and bonding, bottom molding, drying and curing, quality inspection, and final packaging and storage. The winding of paper cups requires the use of corresponding molds, and the paper is rolled into a cup tube by ultrasonic welding and other methods. After the cup tube is formed, it needs to be removed from the mold and returned to the production line;

[0003] However, the existing paper cup tube return devices are all completed by using a reciprocating stepping clamping mechanism. Such a conveying distance is short and fixed. When the cup tube needs to be conveyed over a long distance, it is difficult to adjust and an additional reciprocating stepping clamping structure needs to be added, resulting in complex and bloated equipment and low adjustment efficiency. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies of the prior art, the present invention provides a paper cup tube returning device for a paper cup forming machine, which can return and convey the cup tube over a long distance and can freely and quickly adjust the conveying distance.

[0006] (II) Technical solution

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a paper cup tube return device for a paper cup forming machine, comprising a mounting plate, a support frame is provided on the mounting plate, a paper cup mold is provided on the side of the support frame, a material return tube is provided at a position of the mounting plate corresponding to the paper cup mold, a rotating driving component is provided at a position on both sides of the paper cup mold on the mounting plate, an opening and closing component is connected between the rotating driving components, the opening and closing component is provided on the mounting plate, the opening and closing component is used to drive the rotating driving component to open and close, a rubber flywheel is provided on the rotating driving component, and the position of the rubber flywheel corresponds to the paper cup mold;

[0008] The opening and closing component includes a reciprocating drive mechanism and a rotating opening and closing mechanism. The rotating opening and closing mechanism is arranged on the mounting plate and located on both sides of the paper cup mold. The reciprocating drive mechanism is arranged at the center of the mounting plate and is hinged to the rotating opening and closing mechanism.

[0009] The rotary drive component includes a bidirectional drive mechanism, a concentric transmission mechanism and a rotating shaft. The bidirectional drive mechanism and the concentric transmission mechanism are arranged under the mounting plate, and the two are connected in transmission. The rotating shaft is arranged on the end face of the rotating opening and closing mechanism. The mounting plate is provided with a movable groove with the same movement path as the rotating shaft. One end of the concentric transmission mechanism is connected to the rotating shaft, and the other end is rotatably connected under the mounting plate, and the position is the same as the rotation center of the rotating opening and closing mechanism. The top end of the rotating shaft is connected to the rubber flywheel.

[0010] Preferably, the reciprocating drive mechanism includes a first motor, which is arranged in the mounting plate and has a turntable on the top. A reciprocating connecting rod assembly is eccentrically hinged on the turntable, and a reciprocating sliding seat is hinged on the other end of the reciprocating connecting rod assembly. A limiting slide rail connected to the mounting plate is provided under the reciprocating sliding seat, and the reciprocating sliding seat is hinged to the rotating opening and closing mechanism.

[0011] Preferably, the rotating opening and closing mechanism includes a support shaft arranged on the mounting plate, a rotating frame is rotatably provided on the support shaft, one end of the rotating frame is provided with a first bearing seat connected to the rotating shaft, and the other end is hinged with an opening and closing connecting rod assembly, and the other end of the opening and closing connecting rod assembly is hinged on the reciprocating sliding seat.

[0012] Preferably, the reciprocating connecting rod assembly includes a fixed connecting rod eccentrically hinged to the turntable, and a sliding connecting rod hinged to the reciprocating sliding seat, the sliding connecting rod and the fixed connecting rod are slidably and telescopically arranged, and a spring is provided between the sliding connecting rod and the fixed connecting rod.

[0013] Preferably, the opening and closing connecting rod assembly includes a first connecting rod hinged to the reciprocating sliding seat, and a second connecting rod hinged to the rotating frame, a bidirectional threaded rod is threadedly matched between the first connecting rod and the second connecting rod, and a nut is provided on the bidirectional threaded rod.

[0014] Preferably, the bidirectional drive mechanism includes a second motor and a second bearing seat arranged under the mounting plate, a drive shaft is rotatably provided in the second bearing seat, both ends of the drive shaft are connected to the concentric transmission mechanism, and a sprocket group connected to the second motor is provided on the side of the drive shaft.

[0015] Preferably, the concentric transmission mechanism includes a first pulley arranged on the rotating shaft, and a second pulley arranged under the mounting plate and at the same position as the support shaft, a transmission belt is provided between the first pulley and the second pulley, and a bevel gear group connected to the drive shaft is provided under the second pulley.

[0016] Preferably, a cast iron flywheel is provided under the rotating shaft, and the cast iron flywheel is used to store the kinetic energy of the rotating shaft.

[0017] (III) Beneficial effects

[0018] Compared with the prior art, the present invention provides a paper cup tube returning device for a paper cup forming machine, which has the following beneficial effects:

[0019] 1. By setting the opening and closing components and the rubber flywheel, the rotating driving component drives the rubber flywheel to rotate at a high speed during operation. Then, when the paper cup tube is formed, the opening and closing components push the rotating driving component to rotate toward the paper cup mold, so that the rotating driving component drives the rubber flywheel to fit the paper cup mold. At the same time, the high-speed rotating rubber flywheel is used to throw the cup tube on the paper cup mold out, so that the cup tube is sent out through the return tube. When it is necessary to increase the conveying distance of the cup tube, the rotating driving component can be used to increase the rotation speed of the rubber flywheel, so as to achieve the purpose of efficiently returning the cup tube and adjusting the conveying distance.

[0020] 2. By setting up a bidirectional drive mechanism and a concentric transmission mechanism, the bidirectional drive mechanism can transmit power to both ends, and use the concentric transmission mechanism to drive the rotating shaft and the rubber flywheel to rotate. At the same time, the rotating shaft and the rubber flywheel rotate in opposite directions to achieve the purpose of synchronous movement of the two rubber flywheels. The concentric transmission mechanism 42 can transmit the power of the bidirectional drive mechanism to the rotating shaft, and use a setting concentric with the rotating opening and closing mechanism, so that when the rotating opening and closing mechanism drives the rotating shaft to rotate, the concentric transmission mechanism 42 can still perform effective transmission work. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional schematic diagram of the present invention;

[0022] Figure 2 It is a three-dimensional schematic diagram of the rubber flywheel of the present invention;

[0023] Figure 3 It is a three-dimensional schematic diagram of the opening and closing component of the present invention;

[0024] Figure 4 It is a three-dimensional schematic diagram of the rotary drive component of the present invention;

[0025] Figure 5 It is a three-dimensional schematic diagram of the reciprocating connecting rod assembly of the present invention;

[0026] Figure 6 It is a three-dimensional schematic diagram of the opening and closing connecting rod assembly of the present invention.

[0027] In the figure: 1. Mounting plate;

[0028] 2. Opening and closing parts;

[0029] 21. reciprocating drive mechanism; 211. first motor; 212. turntable;

[0030] 2133, reciprocating connecting rod assembly; 2131, fixed connecting rod; 2132, sliding connecting rod; 2133, spring;

[0031] 214, reciprocating sliding seat; 215, limiting sliding rail;

[0032] 22. Rotating opening and closing mechanism; 221. Support shaft; 222. Rotating frame; 223. First bearing seat;

[0033] 224, opening and closing connecting rod assembly; 2241, first connecting rod; 2242, second connecting rod; 2243, bidirectional bidirectional threaded rod; 2244, nut;

[0034] 3. Activity slot;

[0035] 4. Rotating drive components;

[0036] 41. bidirectional driving mechanism; 411. second motor; 412. chain wheel set; 413. second bearing seat; 414. driving shaft;

[0037] 42. concentric transmission mechanism; 421. first pulley; 422. transmission belt; 423. bevel gear set; 424. second pulley;

[0038] 43. Rotating shaft; 44. Cast iron flywheel;

[0039] 5. Support frame; 6. Paper cup mold; 7. Material return barrel; 8. Rubber flywheel. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] See also Figure 1-6 A paper cup tube return device for a paper cup forming machine comprises a mounting plate 1, a support frame 5 is arranged on the mounting plate 1, a paper cup mold 6 is arranged on the side of the support frame 5, a material return tube 7 is arranged at a position corresponding to the paper cup mold 6 on the mounting plate 1, a rotary drive component 4 is arranged at positions on both sides of the paper cup mold 6 on the mounting plate 1, an opening and closing component 2 is connected between the rotary drive components 4, the opening and closing component 2 is arranged on the mounting plate 1, the opening and closing component 2 is used to drive the rotary drive component 4 to open and close, a rubber flywheel 8 is arranged on the rotary drive component 4, and the position of the rubber flywheel 8 corresponds to the paper cup mold 6;

[0042] By setting the rubber flywheel 8, the rubber flywheel 8 can rotate at a high speed driven by the rotating drive component 4. After being fitted with the formed cup tube, the thrust of the rubber flywheel 8 during high-speed rotation is used to push the cup tube outward, so that the cup tube is separated from the paper cup mold 6, thereby achieving the purpose of material withdrawal, and the conveying distance is proportional to the rotation speed of the rubber flywheel 8, that is, the faster the rotation speed of the rubber flywheel 8, the longer the conveying distance of the cup tube, and the opening and closing component 2 can drive the rotating drive component 4 to expand or close, so that the rubber flywheel 8 moves away when the cup tube is wound, and moves back when the material is withdrawn.

[0043] The opening and closing component 2 includes a reciprocating drive mechanism 21 and a rotating opening and closing mechanism 22. The rotating opening and closing mechanism 22 is arranged on the mounting plate 1 and is located on both sides of the paper cup mold 6. The reciprocating drive mechanism 21 is arranged at the center of the mounting plate 1 and is hinged to the rotating opening and closing mechanism 22.

[0044] By setting up a reciprocating drive mechanism 21 and a rotating opening and closing mechanism 22, the reciprocating drive mechanism 21 can convert the rotational power into a linear reciprocating motion, and the rotating opening and closing mechanism 22 can utilize the connection with the reciprocating drive mechanism 21 to intermittently perform an opening and closing action, thereby achieving the purpose of driving the rubber flywheel 8 to change its position.

[0045] The rotating drive component 4 includes a bidirectional driving mechanism 41, a concentric transmission mechanism 42 and a rotating shaft 43. The bidirectional driving mechanism 41 and the concentric transmission mechanism 42 are arranged under the mounting plate 1, and the two are connected in a transmission manner. The rotating shaft 43 is arranged on the end surface of the rotating opening and closing mechanism 22. The mounting plate 1 is provided with a movable groove 3 having the same movement path as the rotating shaft 43. One end of the concentric transmission mechanism 42 is connected to the rotating shaft 43, and the other end is rotatably connected to the mounting plate 1, and the position is the same as the rotation center of the rotating opening and closing mechanism 22. The top end of the rotating shaft 43 is connected to the rubber flywheel 8.

[0046] By setting up a bidirectional driving mechanism 41 and a concentric transmission mechanism 42, the bidirectional driving mechanism 41 can transmit power to both ends, and use the concentric transmission mechanism 42 to drive the rotating shaft 43 and the rubber flywheel 8 to rotate. At the same time, the rotating shaft 43 and the rubber flywheel 8 rotate in opposite directions to achieve the purpose of synchronous movement of the two rubber flywheels 8. The concentric transmission mechanism 42 can transmit the power of the bidirectional driving mechanism 41 to the rotating shaft 43, and use a setting concentric with the rotating opening and closing mechanism 22, so that when the rotating opening and closing mechanism 22 drives the rotating shaft 43 to rotate, the concentric transmission mechanism 42 can still perform effective transmission work.

[0047] The reciprocating drive mechanism 21 includes a first motor 211, which is arranged in the mounting plate 1 and has a rotating disk 212 at the top. A reciprocating connecting rod assembly 2013 is eccentrically hinged on the rotating disk 212, and a reciprocating sliding seat 214 is hinged at the other end of the reciprocating connecting rod assembly 2013. A limiting slide rail 215 connected to the mounting plate 1 is provided under the reciprocating sliding seat 214, and the reciprocating sliding seat 214 is hinged to the rotating opening and closing mechanism 22;

[0048] By setting up a turntable 212 and a reciprocating sliding seat 214, the turntable 212 can rotate under the drive of the first motor 211 and drive the eccentrically hinged reciprocating connecting rod assembly 2013 to move, and the reciprocating connecting rod assembly 2013 can be hinged at the other end with the reciprocating sliding seat 214 to convert power into linear reciprocating movement, thereby driving the reciprocating sliding seat 214 to move on the limiting slide rail 215, and the reciprocating sliding seat 214 can disperse the linear movement to both sides, thereby achieving the purpose of promoting the operation of the rotating opening and closing mechanism 22 on both sides.

[0049] The rotating opening and closing mechanism 22 includes a support shaft 221 arranged on the mounting plate 1, a rotating frame 222 is rotatably arranged on the support shaft 221, one end of the rotating frame 222 is provided with a first bearing seat 223 connected to the rotating shaft 43, and the other end is hinged with an opening and closing connecting rod assembly 224, and the other end of the opening and closing connecting rod assembly 224 is hinged on the reciprocating sliding seat 214;

[0050] By setting up an opening and closing connecting rod assembly 224 and a rotating frame 222, the opening and closing connecting rod assembly 224 is connected between the rotating frame 222 and the reciprocating sliding seat 214, and the linear movement of the reciprocating sliding seat 214 is used to drive the rotating frame 222 to perform a rotational opening and closing action, so that the rotating opening and closing mechanisms 22 on both sides rely on the same driving source to work, which can ensure the synchronization and continuity of the opening and closing work.

[0051] The reciprocating connecting rod assembly 2013 includes a fixed connecting rod 2131 eccentrically hinged to the rotating disk 212, and a sliding connecting rod 2132 hinged to the reciprocating sliding seat 214. The sliding connecting rod 2132 and the fixed connecting rod 2131 are arranged to slide and telescope, and a spring 2133 is arranged between the sliding connecting rod 2132 and the fixed connecting rod 2131.

[0052] By combining the fixed link 2131 and the sliding link 2132, the reciprocating link assembly 2013 can be extended and retracted, and the spring 2133 is used to apply an adaptive thrust, so that it can apply additional pressure to the rotating drive component 4 through the reciprocating sliding seat 214 and the rotating opening and closing mechanism 22, so that the rubber flywheel 8 can fit more closely with the cup tube, and the fixed link 2131 and the sliding link 2132 can absorb the excess movement by extension and retraction.

[0053] The opening and closing connecting rod assembly 224 includes a first connecting rod 2241 hinged to the reciprocating sliding seat 214, and a second connecting rod 2242 hinged to the rotating frame 222. A bidirectional threaded rod 2243 is threadedly matched between the first connecting rod 2241 and the second connecting rod 2242, and a nut 2244 is provided on the bidirectional threaded rod 2243.

[0054] By setting a bidirectional threaded rod 2243, the bidirectional threaded rod 2243 can be used to adjust the distance between the first connecting rod 2241 and the second connecting rod 2242, thereby adjusting the length of the opening and closing connecting rod assembly 224, and correspondingly adjusting the movement range of the rotating frame 222 and the rubber flywheel 8, so that the device can adjust the opening and closing distance according to different sizes of paper cup molds 6, thereby improving the adaptability of the device.

[0055] The bidirectional driving mechanism 41 comprises a second motor 411 and a second bearing seat 413 provided under the mounting plate 1. A driving shaft 414 is rotatably provided in the second bearing seat 413. Both ends of the driving shaft 414 are connected to the concentric transmission mechanism 42. A sprocket wheel set 412 is provided on the side of the driving shaft 414 for transmission connection with the second motor 411.

[0056] By setting up the sprocket wheel set 412, the sprocket wheel set 412 can transmit the power of the second motor 411 in parallel to the drive shaft 414, so that both ends of the drive shaft 414 are connected to the concentric transmission mechanism 42 for transmission, thereby achieving a two-way transmission effect, and the driving wheel size of the sprocket wheel set 412 is smaller than the driven wheel. In this way, the torque output by the drive shaft 414 can be increased, avoiding the problem of easy overload when the second motor 411 is started.

[0057] The concentric transmission mechanism 42 includes a first pulley 421 disposed on the rotating shaft 43, and a second pulley 424 disposed under the mounting plate 1 and at the same position as the support shaft 221, a transmission belt 422 is disposed between the first pulley 421 and the second pulley 424, and a bevel gear set 423 connected to the drive shaft 414 is disposed under the second pulley 424;

[0058] By setting the second pulley 424 and the bevel gear set 423, the bevel gear set 423 can receive the power of the driving shaft 414 and drive the second pulley 424 to rotate after changing the direction, and the second pulley 424 can drive the first pulley 421 to rotate through the transmission belt 422, thereby achieving the purpose of driving the rotating shaft 43 and the rubber flywheel 8, and the second pulley 424 is arranged concentrically with the support shaft 221, so that when the rotating frame 222 drives the rotating shaft 43 to move, the distance between the first pulley 421 and the second pulley 424 will not change, thereby achieving a stable transmission effect.

[0059] A cast iron flywheel 44 is provided under the rotating shaft 43, and the cast iron flywheel 44 is used to store the kinetic energy of the rotating shaft 43;

[0060] By setting up the cast iron flywheel 44, the cast iron flywheel 44 can, on the one hand, use its own mass and centrifugal force to store the kinetic energy of the rotating shaft 43, so that the rotation speed of the rubber flywheel 8 gradually increases; on the other hand, it can balance the rotating shaft 43 to avoid the problem of offset centrifugal force generated by the rubber flywheel 8 when it rotates at a high speed at the top of the rotating shaft 43, causing equipment vibration.

[0061] Working principle:

[0062] After the cup tube is formed, the second motor 411 drives the shaft 414 at the top of the sprocket wheel group 412 to rotate, and the driving shaft 414 drives the second pulley 424 to rotate through the bevel gear group 423. The second pulley 424 drives the rotating shaft 43 to rotate through the transmission belt 422 and the first pulley 421. The rotating shaft 43 drives the rubber flywheel 8 and the cast iron flywheel 44 to rotate, and then the first motor 211 drives the reciprocating connecting rod assembly 2013 to move through the rotating disk 212. The reciprocating connecting rod assembly 2013 uses the reciprocating sliding seat 214 to rotate. The reciprocating sliding seat 214 is hinged to move linearly on the limiting slide rail 215. When the reciprocating sliding seat 214 moves, the opening and closing connecting rod assembly 224 is used to push the rotating frame 222 to rotate around the supporting shaft 221. When the rotating frame 222 rotates, the first bearing seat 223 on the end face drives the rotating shaft 43 to move toward the position of the paper cup mold 6, so that the rubber flywheel 8 on the end face of the rotating shaft 43 fits with the cup tube on the paper cup mold 6, and the centrifugal force when the rubber flywheel 8 rotates is used to push the cup tube out of the paper cup mold 6, so that the cup tube is sent out through the unloading cylinder 7.

[0063] The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent replacements or modifications made based on the present invention to solve basically the same technical problems and achieve basically the same technical effects are all included in the protection scope of the present invention.

Claims

1. A paper cup tube return device for a paper cup forming machine, comprising a mounting plate (1), characterized in that: The mounting plate (1) is provided with a support frame (5), a paper cup mold (6) is provided on the side of the support frame (5), a material ejection cylinder (7) is provided on the mounting plate (1) at a position corresponding to the paper cup mold (6), a rotary drive component (4) is provided on the mounting plate (1) at positions on both sides of the paper cup mold (6), an opening and closing component (2) is connected between the rotary drive components (4), the opening and closing component (2) is provided on the mounting plate (1), and the opening and closing component (2) is used to drive the rotary drive component (4) to open and close, and a rubber flywheel (8) is provided on the rotary drive component (4), and the position of the rubber flywheel (8) corresponds to the paper cup mold (6); The opening and closing component (2) comprises a reciprocating drive mechanism (21) and a rotating opening and closing mechanism (22); the rotating opening and closing mechanism (22) is arranged on the mounting plate (1) and located on both sides of the paper cup mold (6); the reciprocating drive mechanism (21) is arranged at the center of the mounting plate (1) and is hinged to the rotating opening and closing mechanism (22); The rotary drive component (4) comprises a bidirectional drive mechanism (41), a concentric transmission mechanism (42) and a rotary shaft (43). The bidirectional drive mechanism (41) and the concentric transmission mechanism (42) are arranged under the mounting plate (1) and are in transmission connection with each other. The rotary shaft (43) is arranged on the end surface of the rotary opening and closing mechanism (22). The mounting plate (1) is provided with a movable groove (3) having the same movement path as the rotary shaft (43). One end of the concentric transmission mechanism (42) is connected to the rotary shaft (43), and the other end is rotatably connected to the mounting plate (1) and is located at the same position as the rotation center of the rotary opening and closing mechanism (22). The top end of the rotary shaft (43) is connected to the rubber flywheel (8).

2. A paper cup tube return device for a paper cup forming machine according to claim 1, characterized in that: The reciprocating drive mechanism (21) comprises a first motor (211), the first motor (211) is arranged in the mounting plate (1), and a rotating disk (212) is provided at the top thereof, a reciprocating connecting rod assembly (2013) is eccentrically hinged on the rotating disk (212), a reciprocating sliding seat (214) is hinged at the other end of the reciprocating connecting rod assembly (2013), a limiting sliding rail (215) connected to the mounting plate (1) is provided below the reciprocating sliding seat (214), and the reciprocating sliding seat (214) is hinged to the rotating opening and closing mechanism (22).

3. A paper cup tube return device for a paper cup forming machine according to claim 2, characterized in that: The rotating opening and closing mechanism (22) comprises a support shaft (221) arranged on the mounting plate (1); a rotating frame (222) is rotatably arranged on the support shaft (221); one end of the rotating frame (222) is provided with a first bearing seat (223) connected to the rotating shaft (43); the other end of the rotating frame (222) is hingedly connected to an opening and closing connecting rod assembly (224); the other end of the opening and closing connecting rod assembly (224) is hingedly connected to the reciprocating sliding seat (214).

4. The paper cup tube return device for a paper cup forming machine according to claim 2, characterized in that: The reciprocating connecting rod assembly (2013) comprises a fixed connecting rod (2131) eccentrically hinged to the rotating disk (212), and a sliding connecting rod (2132) hinged to the reciprocating sliding seat (214); the sliding connecting rod (2132) and the fixed connecting rod (2131) are arranged to slide and telescope; a spring (2133) is arranged between the sliding connecting rod (2132) and the fixed connecting rod (2131).

5. The paper cup tube return device for a paper cup forming machine according to claim 3, characterized in that: The opening and closing connecting rod assembly (224) comprises a first connecting rod (2241) hinged to the reciprocating sliding seat (214), and a second connecting rod (2242) hinged to the rotating frame (222), a bidirectional threaded rod (2243) is threadedly matched between the first connecting rod (2241) and the second connecting rod (2242), and a nut (2244) is provided on the bidirectional threaded rod (2243).

6. The paper cup tube return device for a paper cup forming machine according to claim 1, characterized in that: The bidirectional driving mechanism (41) comprises a second motor (411) and a second bearing seat (413) arranged under the mounting plate (1); a driving shaft (414) is rotatably arranged in the second bearing seat (413); both ends of the driving shaft (414) are connected to the concentric transmission mechanism (42); and a sprocket wheel set (412) drivingly connected to the second motor (411) is arranged on the side of the driving shaft (414).

7. A paper cup tube return device for a paper cup forming machine according to claim 6, characterized in that: The concentric transmission mechanism (42) comprises a first pulley (421) arranged on a rotating shaft (43), and a second pulley (424) arranged under a mounting plate (1) and at the same position as a supporting shaft (221), a transmission belt (422) being arranged between the first pulley (421) and the second pulley (424), and a bevel gear set (423) connected to a driving shaft (414) being arranged under the second pulley (424).

8. The paper cup tube return device for a paper cup forming machine according to claim 1, characterized in that: A cast iron flywheel (44) is provided under the rotating shaft (43), and the cast iron flywheel (44) is used to store the kinetic energy of the rotating shaft (43).

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