Tongue structure for sheet products

Abstract

The utility model discloses a tongue-inserting structure for sheet products, belonging to the field of packaging technology. It includes a conveying mechanism, a limiting beam, a tongue-inserting assembly, two upper limit plates, two groups of adsorption assemblies, a lifting cylinder and a lifting frame, wherein the limiting beam is located at the adjacent upper part of a packaging box, the tongue-inserting assembly includes two tongue-inserting plates, and the two upper limit plates are respectively located at the left and right sides of the conveying mechanism; the upper limit plates are located at the adjacent upper parts of the corresponding ends of the packaging box, and are located directly above the tongue-inserting plates; the two groups of adsorption assemblies are respectively arranged at the left and right sides of the lifting frame and include a suction cup or a plurality of suction cups arranged side by side in front and back; the suction cup is arranged vertically, and is arranged at the bottom of the corresponding side of the lifting frame, and is located directly above the packaging box, and is located between the limiting beam and the upper limit plate on the corresponding side; all suction cups are driven synchronously; when the tongue-inserting plates are located outside the packaging box, the suction cups press downward on the upper side of the packaging box; when the tongue-inserting plates press the box cover of the packaging box inward, the suction cups move upward and adsorb the packaging box.

Description

Technical Field

[0001] The utility model belongs to the technical field of packaging, and particularly relates to a tongue inserting structure for sheet products, which is specifically used for packaging stacked cotton sheets or gauze sheets. Background Art

[0002] Cotton pads are a type of cotton towel made from 100% pure natural cotton. They are made using advanced cotton spunlace non-woven fabric technology and then sterilized with high-pressure steam. They are soft, delicate, absorbent, and non-shedding. They are new environmentally friendly alternatives to paper towels, cosmetic cotton pads, and face towels. Gauze pads are made from absorbent cotton gauze and are basically used for medical or medical disinfection and sterilization. The product is white and has strong water absorption. It is used by medical units for external debridement care and health care. Cotton pads or gauze pads (after lamination) can be automatically loaded into paper boxes using a boxing machine.

[0003] For example, the patent with application number CN202021289917.5 discloses an automatic cartoning machine for antennas, comprising a conveyor belt, a feeding assembly and a cartoning assembly arranged along the conveying direction of the carton; the feeding assembly comprises a stacking and folding mechanism and a flip suction cup mechanism arranged at the outlet of the stacking and folding mechanism and used to adsorb the carton; the cartoning assembly comprises a feeding station, an ear punching station, a guiding and folding station, a tongue folding station and a tongue inserting station arranged in sequence along the conveying direction of the conveyor belt; the feeding station comprises a feeding assembly arranged on either side of the conveyor belt and used to push the antenna; the ear punching station comprises an ear punching mechanism arranged in pairs on both sides of the conveyor belt and used to fold the ear part; the guiding and folding station comprises a guiding and folding mechanism arranged on the side of the conveyor belt and used to guide the folding part to fold up; the tongue folding station comprises a tongue folding mechanism arranged in pairs on both sides of the conveyor belt and used to bend the tongue part; the tongue inserting station comprises a tongue inserting mechanism arranged in pairs on both sides of the conveyor belt and used to push the sealing part.

[0004] For example, the patent with application number CN202320256881.8 discloses a mechanism for automatically sealing a box mouth, comprising a machine platform, a conveyor belt is arranged on the top of the machine platform, and a limit plate, a limit bar, a side push part, a front push part and a push-closing part are respectively arranged on both sides of the conveyor belt; the limit bar is arranged on the side of the limit plate away from the conveyor belt; the side push part, the front push part and the push-closing part are arranged in sequence from the feeding end to the discharging end of the limit plate; the side push part is arranged at the feeding end of the limit plate, and the side push part is used to push the side ear block of the box; the pushing end of the front push part is arranged below the limit plate, and the pushing end of the push-closing part is arranged on the side of the limit plate. The positive push portion includes a first vertical column, a first adjustment block, a first adjustment column and a first push plate; the first vertical column is installed on the top of the movable plate, the first adjustment block is slidably mounted on the first vertical column, the first adjustment column is arranged on one side of the first adjustment block, one end of the first adjustment column slides through the first adjustment block and pushes toward the first vertical column; one end of the first push plate is installed on the first adjustment block, and the other end of the first push plate pushes toward the conveyor belt. The push-closing portion includes a second vertical column, a second adjustment block, a second adjustment column and a second push plate; the second vertical column is installed on the top of the movable plate, the second adjustment block is slidably mounted on the second vertical column, the second adjustment column is arranged on one side of the second adjustment block, one end of the second adjustment column slides through the second adjustment block and pushes toward the second vertical column; one end of the second push plate is installed on the second adjustment block, and the other end of the second push plate pushes toward the conveyor belt.

[0005] The end of the cartoning machine is usually a tongue-insertion structure, which includes a conveying mechanism arranged along the front-to-back direction, a limiting beam arranged directly above the conveying mechanism and along the front-to-back direction, and tongue-insertion components on the left and right sides of the conveying mechanism. The limiting beam is located adjacent to the upper side of the packaging box, and the tongue-insertion component includes two tongue-insertion plates driven synchronously. The two tongue-insertion plates are respectively located on the left and right sides of the packaging box 1 and can move toward or away from each other.

[0006] Products are usually stacked in a box. When the box cover is closed, it is easy to insert into the top product (the product itself is folded) or between the top and second top products, which not only makes insertion difficult, but also exposes the product. Utility Model Content

[0007] In order to solve the aforementioned problems, the embodiment of the utility model provides a tongue-insertion structure for sheet products. On the basis of the existing structure, two upper limit plates, two groups of adsorption components, a lifting cylinder and a lifting frame are added. The suction cup presses downward (lightly presses) on the upper side of the packaging box to compact the product in the packaging box (lowering the height of the top product, so that the gap between the top product and the upper side of the packaging box (when pulled upward by the suction cup) becomes larger). When the tongue-insertion plate presses inward on the lid of the packaging box 1, the suction cup moves upward and adsorbs the packaging box to separate the upper side of the packaging box from the top product to form a gap to facilitate the insertion of the lid. At the same time, the upper side of the packaging box is slightly arched upward to facilitate the insertion of the lid. The technical solution is as follows:

[0008] The embodiment of the utility model provides a tongue-insertion structure for sheet products, comprising a conveying mechanism 2 arranged in the front-to-back direction, a limiting beam 3 arranged in the front-to-back direction just above the conveying mechanism 2, and tongue-insertion components 4 on the left and right sides of the conveying mechanism 2, wherein the limiting beam 3 is located above the adjacent packaging box 1, and the tongue-insertion component 4 comprises two tongue-insertion plates driven synchronously, the two tongue-insertion plates are respectively located on the left and right sides of the packaging box 1 and can move toward or away from each other; the tongue-insertion structure also comprises two upper limit plates 5, two groups of adsorption components, a lifting cylinder 6 arranged vertically upward on the upper side of the limiting beam 3, and a lifting frame 7 on the lifting cylinder 6 and capable of moving up and down; the two upper limit plates 5 are respectively located on the conveying mechanism 2 on the left and right sides; the upper limit plate 5 is arranged in the front-to-back direction, which is located adjacent to the upper side of the corresponding end of the packaging box 1, and is located directly above the tongue-inserting plate; two groups of adsorption components are respectively arranged on the left and right sides of the lifting frame 7 and include a suction cup 8 or a plurality of suction cups 8 arranged side by side in front and back; the suction cup 8 is arranged vertically, which is arranged at the bottom of the corresponding side of the lifting frame 7, which is located directly above the packaging box 1, and is located between the limiting beam 3 and the upper limit plate 5 on the corresponding side; all suction cups 8 are driven synchronously; when the tongue-inserting plate is outside the packaging box 1, the suction cup 8 presses downward on the upper side of the packaging box 1; when the tongue-inserting plate presses the cover of the packaging box 1 inward, the suction cup 8 moves upward and adsorbs the packaging box 1.

[0009] Among them, the two telescopic rods of the lifting cylinder 6 in the embodiment of the utility model are arranged side by side front and back, and the lifting frame 7 is a "J"-shaped structure and includes a top side, two vertical sides and two bottom sides; the two vertical sides are arranged side by side left and right, and they are all arranged vertically, and they are respectively located on both sides of the limiting beam 3; the top side is arranged between the top ends of the two vertical sides and it is arranged in the left and right directions, the two bottom sides are respectively located on the outer sides of the lower ends of the two vertical sides and they are both arranged in the left and right directions, the lifting cylinder 6 is located between the two vertical sides and the upper end of its telescopic rod is fixedly connected to the lower side of the top side, and the two groups of adsorption components are respectively arranged on the lower sides of the two bottom sides.

[0010] Furthermore, the adsorption assembly in the embodiment of the utility model includes two suction cups 8 arranged side by side front and back, and a fixing part 9 is provided on the bottom edge, and the fixing part 9 includes a vertically arranged fixing rod 91 and a front-to-back arranged fixing plate 92; the upper end of the fixing rod 91 is fixed on the bottom edge, and the lower end thereof is fixedly connected to the middle part of the fixing plate 92; the two suction cups 8 are respectively fixed on the front lower side and the rear lower side of the fixing plate 92.

[0011] Preferably, a transverse strip hole 93 is provided on the left and right sides of the upper edge of the bottom edge in the embodiment of the utility model; the fixing rod 91 is a screw rod, on which two locking nuts 94 are provided, which pass upward through the transverse strip hole 93; the two locking nuts 94 are pressed on the upper and lower sides of the bottom edge to fix the fixing rod 91 on the bottom edge; by loosening the locking nuts 94, the fixing rod 91 can be adjusted up and down or left and right.

[0012] Preferably, the front and rear portions of the fixing plate 92 in the embodiment of the utility model are both provided with longitudinal strip holes 95 along the front-to-back direction; the suction cup 8 is circular, and an air pipe 10 is provided at the center of its upper side, and a locking bolt 96 is provided on its upper side and directly in front of or directly behind the air pipe 10, which rests against the lower side of the fixing plate 92; the air pipe 10 passes upward through the longitudinal strip hole 95, and the locking bolt 96 passes vertically downward through the longitudinal strip hole 95 and fixes the suction cup 8 on the bottom edge; the suction cup 8 can be adjusted forward and backward by loosening the locking bolt 96.

[0013] Among them, a plurality of limiting structures for fixing the packaging box 1 are provided at equal intervals front and back on the conveying mechanism 2 in the embodiment of the utility model; each time the limiting structure moves backward a distance that corresponds to a corresponding backward movement of one packaging station, the limiting structure includes four limiting plates distributed in a rectangular shape, the two limiting plates on the front side are located on the front side of the packaging box 1, and the two limiting plates on the rear side are located on the rear side of the packaging box 1; the upper limiting plate 5 is located on the adjacent outer side of the limiting plate on the corresponding side and its front end is located on the adjacent rear of the previous packaging station.

[0014] The upper limit plate 5 in the embodiment of the utility model is a horizontally arranged rectangular plate and its front end is an arc-shaped surface, and the arc-shaped surface is bent outwardly in an arc shape from back to front.

[0015] Preferably, the suction cup 8 in the embodiment of the utility model is arranged close to the upper limit plate 5 on the corresponding side.

[0016] The technical solution provided by the embodiment of the utility model has the following beneficial effects: the embodiment of the utility model provides a tongue-insertion structure for sheet products, which adds two upper limit plates, two groups of adsorption components, a lifting cylinder and a lifting frame on the basis of the existing structure, and the suction cup presses downward (lightly presses) on the upper side of the packaging box to compact the products in the packaging box (lowering the height of the top product, so that the gap between the top product and the upper side of the packaging box (when pulled upward by the suction cup) becomes larger). When the tongue-insertion plate presses the box cover of the packaging box inward, the suction cup moves upward and adsorbs the packaging box to separate the upper side of the packaging box from the top product to form a gap for easy insertion of the box cover, and at the same time, slightly arching the upper side of the packaging box upward can also facilitate the insertion of the box cover, avoiding the top product from being located on the upper side of the folded edge of the box cover, thereby avoiding product exposure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of the tongue structure for sheet products in this embodiment;

[0018] Figure 2 yes Figure 1 Schematic diagram of the structure when the suction cup presses the packaging box;

[0019] Figure 3 yes Figure 1 A schematic diagram of the structure when the tongue assembly presses against the box cover;

[0020] Figure 4 yes Figure 1 A schematic diagram of the structure when the tongue assembly and the suction cup are returned to their original positions;

[0021] Figure 5 is a top view of a tongue structure for a sheet product;

[0022] Figure 6 yes Figure 5 A schematic diagram of the structure when the tongue assembly presses against the box cover;

[0023] Figure 7 yes Figure 5 A partial enlarged view of

[0024] Figure 8 It is a structural schematic diagram of a combination of a lifting frame, a suction cup and a fixing part.

[0025] In the figure: 1 packaging box, 2 conveying mechanism, 3 limiting beam, 4 tongue assembly, 5 upper limit plate, 6 lifting cylinder, 7 lifting frame, 8 suction cup, 9 fixing part, 10 air pipe;

[0026] 91 fixing rod, 92 fixing plate, 93 transverse strip hole, 94 locking nut, 95 longitudinal strip hole, 96 locking bolt. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below with reference to the accompanying drawings.

[0028] Example 1

[0029] See also Figure 1-8 Embodiment 1 provides a tongue structure for sheet products, including a conveying mechanism 2, a limiting beam 3, and a tongue assembly 4. The conveying mechanism 2 is arranged in the front-to-back direction, and a plurality of limiting structures for fixing the packaging box 1 are arranged at equal intervals in the front and back directions (corresponding to a plurality of packaging stations, see the description of the application number CN202021165964.9). Each time the limiting structure moves backward, the distance corresponding to the movement backward of one packaging station is equal. The limiting structure includes four limiting plates distributed in a rectangular shape, the two limiting plates on the front side are located on the front side of the packaging box 1, and the two limiting plates on the rear side are located on the rear side of the packaging box 1. The limiting beam 3 is located directly above the conveying mechanism 2, which is arranged in the front-to-back direction, and is located adjacent to and above the packaging box 1, which prevents the packaging box 1 from moving upward. The tongue assembly 4 is arranged on the left and right sides of the conveying mechanism 2 and includes two tongue plates driven synchronously (driven to move left and right by corresponding structures), etc. The two tongue plates are respectively located on the left and right sides of the packaging box 1, which can move toward or away from each other, and are arranged in the front-back direction, and are used to press the box cover against the corresponding side (left or right) of the packaging box 1. The above structure is basically the same as the structure of the existing tongue structure, except that:

[0030] The tongue-insertion structure in this embodiment also includes two upper limit plates 5, two groups of adsorption components, a lifting cylinder 6 and a lifting frame 7. The two upper limit plates 5 are respectively located on the left and right sides of the conveying mechanism 2. The upper limit plate 5 is arranged in the front-to-back direction, and is located adjacent to the upper side of the corresponding end of the packaging box 1, and is located directly above the tongue-insertion plate, and is located adjacent to the outer side of the limiting plate on the corresponding side (left or right). Its front end is located adjacent to the rear of the previous packaging station (specifically the tongue-folding station), and its rear end is located behind the current packaging station. It is specifically a horizontally arranged rectangular plate, and its front end is an arc-shaped surface (the arc-shaped surface is bent outwardly from back to front, and is used to guide the box cover to bend inward), which is used to prevent the upper side of the packaging box 1 from excessively moving upward, deforming or breaking. The lifting cylinder 6 is arranged on the upper side of the limiting beam 3, and is arranged vertically upward. It is used to drive the lifting frame 7 to move up and down. It is specifically a double-axis cylinder (its two telescopic rods are arranged side by side front and back). The lifting frame 7 is arranged on the lifting cylinder 6, which can move up and down, and is specifically a "J"-shaped structure. Two groups of adsorption components are respectively arranged on the left and right sides of the lifting frame 7 and include a suction cup 8 or a plurality of suction cups 8 arranged side by side in front and back (preferred). The suction cup 8 is arranged vertically, and is arranged at the bottom of the corresponding side of the lifting frame 7, and is located directly above the packaging box 1, and is located between the limiting beam 3 and the upper limit plate 5 on the corresponding side. Preferably, the suction cup 8 is arranged close to the upper limit plate 5 on the corresponding side. All suction cups 8 are driven synchronously. When the tongue plate is located outside the packaging box 1, the suction cup 8 presses downward (lightly presses) on the upper side of the packaging box 1 to compact the product in the packaging box 1. When the tongue plate presses the lid of the packaging box 1 inward, the suction cup 8 moves upward and adsorbs (adsorbs for a short time, specifically in the initial stage of upward movement) the packaging box 1 so that the upper side of the packaging box 1 is separated from the product at the top to form a gap for easy insertion of the lid, and at the same time, the upper side of the packaging box 1 is slightly arched upward to facilitate the insertion of the lid.

[0031] Specifically, the lifting frame 7 in this embodiment is a "X"-shaped structure and includes a top side, two vertical sides and two bottom sides. The two vertical sides are arranged side by side, both of which are arranged vertically, and are respectively located on the left and right sides of the limiting beam 3. The top side is arranged between the top ends of the two vertical sides and is arranged in the left and right directions, the two bottom sides are respectively located outside the lower ends of the two vertical sides and are both arranged in the left and right directions, the lifting cylinder 6 is located between the two vertical sides and the upper end of its telescopic rod is fixedly connected to the lower side of the top side, and the two groups of adsorption components are respectively arranged on the lower sides of the two bottom sides.

[0032] Example 2

[0033] See also Figure 1-8, Embodiment 2 provides a tongue structure for sheet products, and its structure is basically the same as that of Embodiment 1, except that: the adsorption assembly in this embodiment includes two suction cups 8 arranged side by side in front and back, and the four suction cups 8 are arranged in a rectangular shape. A fixing member 9 is provided on the bottom edge to fix the suction cup 8, and the fixing member 9 includes a fixing rod 91 arranged vertically and a fixing plate 9 arranged in the front and back directions. The upper end of the fixing rod 91 is fixed to the bottom edge, and the lower end thereof is fixedly connected to the middle of the fixing plate 92. The two suction cups 8 are fixed to the lower front side and the lower rear side of the fixing plate 92, respectively.

[0034] Example 3

[0035] See also Figure 1-8 , Example 3 provides a tongue structure for sheet products, and its structure is basically the same as that of Example 2, except that: the suction cup 8 in this embodiment can be adjusted (including the front-to-back position, the left-to-right position and the vertical position) to adapt to different products and fine-tune (to ensure the effect). Horizontal strip holes 93 are provided on the left and right sides of the bottom edge. The fixing rod 91 is a screw rod, on which two locking nuts 94 (which cannot pass through the horizontal strip holes 93) are provided, which pass through the horizontal strip holes 93 upward. The two locking nuts 94 are pressed on the upper and lower sides of the bottom edge to fix the fixing rod 91 on the bottom edge. By loosening the locking nuts 94, the fixing rod 91 can be adjusted up and down or left and right, and then the suction cup 8 can be adjusted up and down or left and right. The front and rear parts of the fixing plate 92 are both provided with longitudinal strip holes 95 along the front-to-back direction. The suction cup 8 is circular, and an air pipe 10 (connected to the negative pressure device and controlled by the corresponding solenoid valve) is provided at the center of its upper side. A locking bolt 96 (the head of which cannot pass through the longitudinal strip hole 95) is provided on the upper side and directly in front of or directly behind the air pipe 10, and it abuts against the lower side of the fixing plate 92; specifically, the locking bolt 96 is located on the side of the air pipe 10 away from the fixing rod 91. The air pipe 10 passes through the longitudinal strip hole 95 upward, and the locking bolt 96 passes through the longitudinal strip hole 95 vertically downward and fixes the suction cup 8 on the bottom edge. The suction cup 8 can be adjusted forward and backward by loosening the locking bolt 96.

[0036] Example 4

[0037] Embodiment 4 provides a tongue structure for sheet products, which is basically the same as that of embodiment 1, except that: the packaging box 1 in this embodiment contains 10 pieces of gauze stacked up and down (folded in itself).

[0038] Example 5

[0039] Example 5 provides a tongue insertion structure for sheet products, which has a structure that is basically the same as that of Example 1, except that the tongue insertion plate in this embodiment is driven synchronously with the tongue folding plate on the corresponding side. Please refer to the descriptions of patents with application numbers CN201721389238.3, CN201621346515.8, CN201922061626.4, CN202121418837.X and CN202223342491.7.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A tongue insertion structure for sheet products, comprising a conveying mechanism (2) arranged in the front-to-back direction, a limiting beam (3) arranged directly above the conveying mechanism (2) and in the front-to-back direction, and tongue insertion assemblies (4) on the left and right sides of the conveying mechanism (2), wherein the limiting beam (3) is located above the adjacent packaging box (1), and the tongue insertion assembly (4) comprises two tongue insertion plates driven synchronously, the two tongue insertion plates are respectively located on the left and right sides of the packaging box (1) and can move towards or away from each other; characterized in that: The tongue-inserting structure further comprises two upper limit plates (5), two groups of adsorption components, a lifting cylinder (6) arranged vertically upward on the upper side of the limiting beam (3), and a lifting frame (7) on the lifting cylinder (6) and capable of moving up and down; the two upper limit plates (5) are respectively located on the left and right sides of the conveying mechanism (2); the upper limit plates (5) are arranged in the front-to-back direction, and are located adjacent to and above the corresponding ends of the packaging box (1), and are located directly above the tongue-inserting plates; the two groups of adsorption components are respectively arranged on the left and right sides of the lifting frame (7), and comprise a suction cup (8) or a plurality of suction cups (8) arranged side by side in the front and back directions; the suction cup (8) is arranged vertically, and is arranged at the bottom of the corresponding side of the lifting frame (7), and is located directly above the packaging box (1), and is located between the limiting beam (3) and the upper limit plates (5) on the corresponding side; all suction cups (8) are driven synchronously; When the tongue-insertion plate is located outside the packaging box (1), the suction cup (8) presses downwardly on the upper side of the packaging box (1); when the tongue-insertion plate presses inwardly on the cover of the packaging box (1), the suction cup (8) moves upwardly and absorbs the packaging box (1).

2. The tongue structure for sheet products according to claim 1, characterized in that: The two telescopic rods of the lifting cylinder (6) are arranged side by side in front and back, and the lifting frame (7) is a "J"-shaped structure and includes a top side, two vertical sides and two bottom sides; the two vertical sides are arranged side by side in the left and right directions, and are both arranged vertically, and are respectively located on both sides of the limiting beam (3); the top side is arranged between the top ends of the two vertical sides and is arranged in the left and right directions, and the two bottom sides are respectively located on the outer sides of the lower ends of the two vertical sides and are both arranged in the left and right directions, the lifting cylinder (6) is located between the two vertical sides and the upper end of its telescopic rod is fixedly connected to the lower side of the top side, and two groups of adsorption components are respectively arranged on the lower sides of the two bottom sides.

3. The tongue structure for sheet products according to claim 2, characterized in that: The adsorption assembly comprises two suction cups (8) arranged side by side in front and back, a fixing member (9) is provided on the bottom edge, and the fixing member (9) comprises a fixing rod (91) arranged vertically and a fixing plate (92) arranged in the front and back directions; the upper end of the fixing rod (91) is fixed on the bottom edge, and the lower end thereof is fixedly connected to the middle part of the fixing plate (92); the two suction cups (8) are respectively fixed on the front lower side and the rear lower side of the fixing plate (92).

4. The tongue structure for sheet products according to claim 3, characterized in that: The bottom edge is provided with a transverse strip hole (93) in the left and right directions; the fixing rod (91) is a screw rod, on which two locking nuts (94) are provided, which pass through the transverse strip hole (93) upwards; the two locking nuts (94) are pressed on the upper and lower sides of the bottom edge to fix the fixing rod (91) on the bottom edge; the fixing rod (91) can be adjusted up and down or left and right by loosening the locking nuts (94).

5. The tongue inserting structure for sheet products according to claim 3, characterized in that: The front and rear parts of the fixing plate (92) are both provided with longitudinal strip holes (95) in the front-to-back direction; the suction cup (8) is circular, and an air pipe (10) is provided at the center of its upper side, and a locking bolt (96) is provided on its upper side and directly in front of or directly behind the air pipe (10), and the locking bolt (96) is pressed against the lower side of the fixing plate (92); the air pipe (10) passes through the longitudinal strip hole (95) upward, and the locking bolt (96) passes through the longitudinal strip hole (95) vertically downward and fixes the suction cup (8) on the bottom edge; the suction cup (8) can be adjusted forward and backward by loosening the locking bolt (96).

6. The tongue inserting structure for sheet products according to claim 1, characterized in that: The conveying mechanism (2) is provided with a plurality of limiting structures for fixing the packaging box (1) at equal intervals in front and back; each time the limiting structure moves backwards, it moves back one packaging station at an equal distance, and the limiting structure comprises four limiting plates distributed in a rectangular shape, the two limiting plates on the front side are located at the front side of the packaging box (1), and the two limiting plates on the rear side are located at the rear side of the packaging box (1); the upper limit plate (5) is located adjacent to the outer side of the limiting plate on the corresponding side and its front end is located adjacent to the rear of the previous packaging station.

7. The tongue structure for sheet products according to claim 1, characterized in that: The upper limit plate (5) is a horizontally arranged rectangular plate and its front end is an arc-shaped surface, and the arc-shaped surface is bent outward in an arc shape from back to front.

8. The tongue inserting structure for sheet products according to claim 1, characterized in that: The suction cup (8) is arranged close to the upper limit plate (5) on the corresponding side.

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