Paper bag opening device

Abstract

The application discloses a paper bag suction opening device and belongs to the field of paper bag bottom pasting machines, which is used for unfolding the bottom of a paper bag and solves the technical problem of the rotation dead point position of the upper suction opening assembly and the lower suction opening assembly caused by the center distance out-of-tolerance. The device comprises a base plate, one side of the base plate is provided with an upper suction opening assembly and a lower suction opening assembly, the upper suction opening assembly and the lower suction opening assembly are symmetrically arranged along the two sides of the paper bag, the upper suction opening assembly and the lower suction opening assembly each comprise a crank, an air arm, an air shaft and a gas distribution disc, one end of the crank is rotationally connected to the base plate, the air arm is provided with a plurality of bag suction nozzles, the air arm is sleeved with a shaft sleeve, the shaft sleeve is sleeved with a sliding sleeve, the sliding sleeve is provided with a rotating shaft, the rotating shaft is rotationally connected to the other end of the crank, the air arm is communicated with the air shaft, the air shaft is rotationally connected to the gas distribution disc, and the gas distribution disc is rotationally connected to the base plate.

Description

Technical Field

[0001] This invention belongs to the field of paper bag bottom pasting machines, and specifically relates to a suction device that helps the bottom of a paper bag unfold. Background Technology

[0002] Paper bag gluing machines unfold the two sides of the paper bag opening, requiring the bag opening to be sucked open first so that the unfolding mechanism can insert into the bag opening. Existing suction-opening devices typically have a pair of suction-opening components symmetrically arranged along the paper bag opening, sucking in and releasing along both sides to open the sealed bag opening. These suction-opening components often use a four-bar linkage to perform the suction-opening action in a circular motion. However, this four-bar linkage suffers from center distance errors, resulting in a persistent dead point during rotation. This causes uneven rotation and high resistance, severely affecting the stability and lifespan of the mechanism. Summary of the Invention

[0003] The purpose of this invention is to provide a paper bag suction device that maintains uniform suction force on both sides of the paper bag to achieve the best paper bag suction effect.

[0004] According to one aspect of the present invention, the paper bag suction opening device includes a base plate, an upper suction opening assembly and a lower suction opening assembly are provided on one side of the base plate, the upper suction opening assembly and the lower suction opening assembly are symmetrically arranged along both sides of the paper bag, the upper suction opening assembly and the lower suction opening assembly each include a crank, an air arm, a ventilation shaft and a gas distribution plate, one end of the crank is rotatably connected to the base plate, the air arm is provided with a plurality of suction nozzles, the air arm is sleeved with a bushing, the bushing is sleeved with a sliding sleeve, the sliding sleeve is provided with a rotating shaft, the rotating shaft is rotatably connected to the other end of the crank, the air arm communicates with the ventilation shaft, the ventilation shaft is rotatably connected to the gas distribution plate, the gas distribution plate is rotatably connected to the base plate, a vacuum receiving plate is provided in a sealed manner between the gas distribution plate and the base plate, the vacuum receiving plate is provided with a vacuum groove for communicating with the ventilation shaft and the suction pipe.

[0005] On the other side of the substrate, a gear transmission mechanism is provided. The gear transmission mechanism includes a drive wheel, two first gears, three intermediate wheels, and two second gears arranged from top to bottom. The drive wheel is connected to a drive source. The drive wheel meshes with two first gears respectively. The two first gears are connected to one end of the crank of the upper suction assembly and the air distribution plate respectively. The upper intermediate wheel meshes with two first gears. The lower two intermediate wheels mesh with two second gears respectively. The lower two intermediate wheels mesh with one upper intermediate wheel respectively. The two second gears are connected to one end of the crank of the lower suction assembly and the air distribution plate respectively.

[0006] The ventilation shaft includes a rotating shaft and a sleeve. The rotating shaft is rotatably connected to the air distribution plate, and the sleeve is sleeved and connected to the air arm.

[0007] One end of the air arm is fitted with a bushing, the middle section of the air arm is connected to the ventilation shaft, the suction bag nozzles are arranged along both sides of the ventilation shaft, and the suction bag nozzles are perpendicular to the air arm.

[0008] The air suction nozzles on both sides of the ventilation shaft are parallel and equally spaced.

[0009] The vacuum plate is fixed to the substrate.

[0010] Both the vacuum receiving plate and the vacuum groove are arc-shaped.

[0011] The vacuum tank is filled with lubricating material and sealed by a gas distribution plate.

[0012] The upper and lower suction-opening components of this invention employ a double-crank mechanism consisting of a crank, an air arm, a ventilation shaft, and an air distribution plate to perform a parallelogram-shaped reciprocating rotational motion. This also constitutes the circular motion of a four-bar linkage, enabling the suction nozzle to absorb and release the bag along both sides of the paper bag opening. By adding a sliding sleeve structure at the connection between the air arm and the crank, the sleeve slides appropriately on the air arm, thereby compensating for the center distance error during the circular motion of the four-bar linkage. This prevents dead points in the rotation caused by excessive center distance in the four-bar linkage, which would affect the stability and service life of the mechanism. Simultaneously, the air arm remains horizontal, ensuring the suction area is flat and undeformed, achieving optimal suction-opening effect at the bottom of the paper bag. Attached Figure Description

[0013] Figure 1 This is a perspective view of the paper bag suction opening device of the present invention;

[0014] Figure 2 for Figure 1 An exploded view of the sliding sleeve structure shown.

[0015] Figure 3 This is a three-dimensional schematic diagram of the paper bag suction opening device of the present invention from another perspective. Detailed Implementation

[0016] The present invention will now be described in further detail with reference to the accompanying drawings.

[0017] like Figure 1 As shown, the paper bag suction opening device includes a base plate 1, which is vertically mounted on a paper bag bottom gluing machine. A gear transmission mechanism 2 is provided on the rear side of the base plate 1, and an upper suction opening component 3 and a lower suction opening component 4 are provided on the front side of the base plate 1. The upper suction opening component 3 and the lower suction opening component 4 have the same structure. The upper suction opening component 3 and the lower suction opening component 4 are symmetrically arranged along both sides of the paper bag, ensuring the consistency of the suction opening amplitude of the upper and lower sides of the paper bag opening, better guaranteeing the next process of the paper bag bottom gluing machine, and improving the production efficiency of the paper bag.

[0018] like Figure 1 , 3As shown, the gear transmission mechanism 2 includes, from top to bottom, a drive wheel 5, two first gears 6, three intermediate wheels 7, and two second gears 8. The drive wheel 5 is connected to the drive source and meshes with the two first gears 6 respectively. The upper intermediate wheel 7 meshes with the two first gears 6, the lower two intermediate wheels 7 mesh with the two second gears 8 respectively, and the lower two intermediate wheels 7 mesh with the upper intermediate wheel 7 respectively. The two second gears 8 are respectively connected to one end of the crank 9 of the lower suction assembly 4 and the valve plate 12.

[0019] like Figure 1 As shown, both the upper suction-opening assembly 3 and the lower suction-opening assembly 4 include a crank 9, an air arm 10, a ventilation shaft 11, and a distribution plate 12. The upper end of the crank 9 is connected to a first gear 6, and the distribution plate 12 is connected to another first gear 6. A vacuum receiving plate 13 is provided between the distribution plate 12 and the base plate 1, and the vacuum receiving plate 13 is supported on the base plate 1 by guide posts. The vacuum receiving plate 13 has a vacuum groove 14. Both the vacuum receiving plate 13 and the vacuum groove 14 are arc-shaped. The interior of the vacuum groove 14 is filled with lubricating material. The distribution plate 12 presses against the vacuum groove 14 and keeps the vacuum groove 14 in a sealed state, giving the vacuum groove 14 a self-lubricating function and reducing friction with the distribution plate 12. The ventilation shaft 11 and the suction pipe 15 are respectively connected to the two sides of the vacuum groove 14. The suction pipe 15 extends from the left side of the base plate 1 and is connected to a vacuum pump. The arc-shaped vacuum groove 14 coincides with the movement trajectory of the ventilation shaft 11, realizing two movement states: the ventilation shaft 11 moves inside the vacuum groove 14 and the ventilation shaft 11 moves outside the vacuum groove 14. This ensures that the vacuuming process of the suction pipe 15 and the suction opening process of the upper suction opening component 3 and the lower suction opening component 4 can be completed intermittently.

[0020] like Figure 1 , 2 As shown, a bushing 16 is sleeved at the rear end of the air arm 10, and a sliding sleeve 17 is sleeved on the bushing 16. The sliding sleeve 17 is provided with a rotating shaft 18, which is rotatably connected to the lower end of the crank 9 by a rolling bearing 24. The middle section of the air arm 10 is connected to a ventilation shaft 11, which includes a rotating shaft part 11a and a sleeve part 11b. The rotating shaft part 11a is rotatably connected to the air distribution plate 12 by a rolling bearing, and the sleeve part 11b is sleeved on and connected to the air arm 10. The air arm 10 is provided with a plurality of suction nozzles 19, which are arranged along both sides of the ventilation shaft 11. The suction nozzles 19 on both sides of the ventilation shaft 11 are parallel and equally spaced, and the suction nozzles 19 are perpendicular to the air arm 10. The air arm 10 and the suction nozzles 19 along both sides of the paper bag are on the same plane.

[0021] like Figure 1 , 3As shown, the drive source drives the drive wheel 5 to rotate, and the two first gears 6 drive the crank 9 and valve plate 12 of the upper suction opening assembly 3 to rotate. The two second gears 8 drive the crank 9 and valve plate 12 of the lower suction opening assembly 4 to rotate in the opposite direction. The gear transmission method of three intermediate wheels 7 not only extends the center distance between the upper suction opening assembly 3 and the lower suction opening assembly 4, making the assembly structure of the upper suction opening assembly 3 and the lower suction opening assembly 4 more compact, but also changes the direction of rotation so that the rotation directions of the first gear 6 and the second gear 8 are opposite, thereby ensuring that the upper suction opening assembly 3 and the lower suction opening assembly 4 can move relative to each other.

[0022] like Figure 1 , 2 As shown, since the crank 9, air arm 10, ventilation shaft 11 and air distribution plate 12 form a double crank mechanism (i.e. a four-bar linkage mechanism), the suction nozzles 19 of the upper suction opening component 3 and the lower suction opening component 4 can perform parallelogram reciprocating motion relative to the paper bag, realizing the suction nozzles 19 adsorbing and releasing along both sides of the paper bag opening. Since the dimensional tolerances of the four-bar linkage cannot be guaranteed to be zero during machining, if they are not zero, the four-bar linkage will inevitably have a dead point position during rotation, making it prone to damage. Therefore, by sliding the sliding sleeve 17 on the air arm 10 with an appropriate amount of sliding, the dimensional errors in the machining of the four-bar linkage are compensated, ensuring that the dimensional tolerances of the first center distance 20 between the vent shaft 11 and the crank 9, the second center distance 21 between the vent shaft 11 and the air distribution plate 12, the third center distance 22 between the air distribution plate 12 and the crank 9, and the fourth center distance 23 between the crank 9 and the air arm 10 are zero. This avoids the dead point position during the rotation of the four-bar linkage, allowing the four-bar linkage to work smoothly.

[0023] like Figure 1 , 3 As shown, the vacuum pipe 15 continuously evacuates the vacuum chamber 14 via a vacuum pump, keeping it in a vacuum state (i.e., suction state). When the upper and lower ventilation shafts 11 rotate within the vacuum chamber 14, the vacuum level decreases due to the vacuum state, providing suction force for the upper and lower suction nozzles 19. When the upper and lower ventilation shafts 11 rotate and their distance is minimal, the distance between the upper and lower suction nozzles 19 is also minimal, allowing them to suction the upper and lower sides of the paper bag opening. When the upper and lower ventilation shafts 11 rotate out of the vacuum chamber 14, the vacuum level returns to normal, and the upper and lower suction nozzles 19 no longer suction the upper and lower sides of the paper bag opening. This process changes the paper bag opening from a closed state to a state where the opening is suctioned open. This method solves the problem of unstable rotation during suction and improves the production efficiency of the paper bag gluing machine.

[0024] The above descriptions are merely some embodiments of the present invention. Those skilled in the art can make various modifications and improvements without departing from the inventive concept of the present invention, and these all fall within the scope of protection of the present invention.

Claims

1. A paper bag suction opening device, characterized in that, Includes a base plate (1), on one side of which is provided an upper suction opening assembly (3) and a lower suction opening assembly (4). The upper suction opening assembly (3) and the lower suction opening assembly (4) are symmetrically arranged along both sides of the paper bag. The upper suction opening assembly (3) and the lower suction opening assembly (4) each include a crank (9), an air arm (10), a ventilation shaft (11), and an air distribution plate (12). One end of the crank (9) is rotatably connected to the base plate (1). The air arm (10) is provided with a plurality of suction nozzles (19). The air arm (10) is fitted with a bushing (16), and the bushing (16) is fitted with a sliding sleeve (17). The sliding sleeve (17) is provided with a rotating shaft (18), which is rotatably connected to the other end of the crank (9). The air arm (10) is connected to a ventilation shaft (11), which is rotatably connected to a distribution plate (12). The distribution plate (12) is rotatably connected to a base plate (1). The distribution plate (12) and the base plate (1) are connected... A vacuum receiving plate (13) is provided in a sealed manner. The vacuum receiving plate (13) is provided with a vacuum groove (14) for connecting the ventilation shaft (11) and the suction pipe (15). A gear transmission mechanism (2) is provided on the other side of the base plate (1). The gear transmission mechanism (2) includes a drive wheel (5), two first gears (6), three intermediate wheels (7) and two second gears (8) arranged from top to bottom. The drive wheel (5) is connected to the drive source. The drive wheel (5) meshes with the two first gears (6) respectively. The two first gears (6) are respectively connected to one end of the crank (9) of the upper suction assembly (3) and the air distribution plate (12). The upper intermediate wheel (7) meshes with the two first gears (6). The lower intermediate wheels (7) mesh with the two second gears (8) respectively. The lower two intermediate wheels (7) mesh with the upper intermediate wheel (7) respectively. The two second gears (8) are respectively connected to one end of the crank (9) of the lower suction assembly (4) and the air distribution plate (12).

2. The paper bag suction opening device according to claim 1, characterized in that, The ventilation shaft (11) includes a rotating shaft (11a) and a sleeve (11b). The rotating shaft (11a) is rotatably connected to the air distribution plate (12), and the sleeve (11b) is sleeved and connected to the air arm (10).

3. The paper bag suction opening device according to claim 1 or 2, characterized in that, One end of the air arm (10) is fitted with a bushing (16), the middle section of the air arm (10) is connected to the ventilation shaft (11), the suction bag nozzle (19) is arranged along both sides of the ventilation shaft (11), and the suction bag nozzle (19) is perpendicular to the air arm (10).

4. The paper bag suction opening device according to claim 2, characterized in that, The air suction nozzles (19) on both sides of the ventilation shaft (11) are parallel and arranged at equal intervals.

5. The paper bag suction opening device according to claim 1, characterized in that, The vacuum plate (13) is fixed to the substrate (1).

6. The paper bag suction opening device according to claim 1, characterized in that, Both the vacuum receiving plate (13) and the vacuum groove (14) are arc-shaped.

7. The paper bag suction opening device according to claim 1, 5, or 6, characterized in that, The vacuum tank (14) is filled with lubricating material and sealed by the gas distribution plate (12).

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