Sealing structure of vertical packaging machine

Abstract

This utility model discloses a sealing structure for a vertical packaging machine, including an outer frame, a pair of guide rods, a pair of movable seats, a pair of horizontal sealing templates, a pair of first cylinders, a cutting blade, a pair of support rods, and a pair of second cylinders. Each horizontal sealing template has a compression plate underneath. A pair of sliding rods are fixed to the opposite sides of the compression plates, and a spring is sleeved on each sliding rod. A pair of upright plates are fixed under the movable seats. The tail end of each sliding rod extends through the upright plate and is screwed with a nut. Compression sponges are installed on the opposite sides of the compression plates. When the springs are not compressed, the distance between the pair of compression sponges is less than the distance between the pair of horizontal sealing templates. By adding spring-supported compression plates and compression sponges, this utility model ensures that before the horizontal sealing templates close, the compression sponges contact the packaging bag and compress the bag, effectively expelling air from the bag towards the opening and reducing residual air inside the bag after sealing.

Description

Technical Field

[0001] This utility model relates to the field of packaging machine technology, and in particular to a sealing structure for a vertical packaging machine. Background Technology

[0002] Vertical packaging machines are widely used in the food, pharmaceutical, and chemical industries for packaging granular, powdered, and liquid materials. Their workflow typically includes bag making, filling, sealing, and cutting. The horizontal sealing structure is a key component that seals the top of one bag while simultaneously sealing the bottom of the next. A common horizontal sealing structure in vertical packaging machines consists of a pair of horizontal sealing templates that move in opposite directions driven by cylinders. This heat-sealing process heats and pressurizes the packaging material, while simultaneously cutting it with cutting blades.

[0003] However, during the sealing process of the existing horizontal sealing structure, the air sealed inside the bag cannot be effectively expelled. When there is a lot of air left inside the packaging bag, it is easy for the bag to bulge after heat sealing. The bulging packaging bag is more likely to rupture due to pressure during subsequent transportation, resulting in product leakage.

[0004] Therefore, we propose a sealing structure for a vertical packaging machine to solve the above problems. Utility Model Content

[0005] The purpose of this utility model is to provide a sealing structure for a vertical packaging machine to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A sealing structure for a vertical packaging machine includes an outer frame, a pair of guide rods, a pair of movable seats, a pair of horizontal sealing templates, a pair of first cylinders, a cutting blade, a pair of support rods, and a pair of second cylinders. Each horizontal sealing template has a pressing plate underneath it. A pair of sliding rods are fixed to the opposite sides of the pressing plates, and a spring is sleeved on the outside of each sliding rod. A pair of upright plates are fixed under the movable seats. The tail end of each sliding rod extends movably through the upright plate and is screwed with a nut. Pressing sponges are installed on the opposite sides of the pressing plates. When the springs are not compressed, the distance between the pair of pressing sponges is smaller than the distance between the pair of horizontal sealing templates.

[0008] In a further embodiment, the extrusion plate includes a fixed plate and a movable plate. The top of the movable plate is provided with an insert plate, which is slidably inserted into the fixed plate. The back of the insert plate is provided with a plurality of positioning holes at equal intervals along the vertical direction. The back of the fixed plate is screwed with a locking bolt, and the head end of the locking bolt is used to insert into the positioning hole.

[0009] In a further embodiment, both the fixed plate and the movable plate have horizontal guide grooves on the side near the extruded sponge, and the back of the extruded sponge has a corresponding guide strip, which is used to slide into the guide groove.

[0010] In a further embodiment, the cross-sectional shape of the guide groove is an arc-shaped structure, and the width of the outer port of the guide groove is smaller than its inner diameter.

[0011] In a further embodiment, the slide rod is fixed to the back of the fixed plate, and the slide rods are symmetrically distributed on both sides about the vertical center plane of the fixed plate.

[0012] In a further embodiment, the upper and lower ends of the extruded sponge bulge outward relative to the extrusion plate, while the middle part is concave inward to form a concave arc-shaped structure.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] This invention adds a spring-supported compression plate and compression sponge below a pair of horizontal sealing templates. Before the horizontal sealing templates close, the compression sponge contacts the packaging bag and compresses the bag body, effectively expelling the air inside the packaging bag towards the bag opening. This reduces the amount of air remaining in the bag after sealing, thus preventing the bag from bulging and making the packaging look flat and beautiful. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the structure of this utility model from below;

[0017] Figure 3 This is a side view cross-sectional structural diagram of the present invention;

[0018] Figure 4 This is a schematic diagram of the assembly structure of the extrusion plate and the extrusion sponge of this utility model.

[0019] In the diagram: 1. Outer frame; 2. Guide rod; 3. Movable seat; 4. Horizontal sealing template; 5. First cylinder; 6. Cutting blade; 7. Support rod; 8. Second cylinder; 9. Extrusion plate; 91. Fixed plate; 92. Movable plate; 921. Insert plate; 922. Positioning hole; 93. Locking bolt; 94. Guide groove; 10. Slide rod; 11. Vertical plate; 12. Spring; 13. Nut; 14. Extrusion sponge; 141. Guide bar. Detailed Implementation

[0020] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figure 1-4 A sealing structure for a vertical packaging machine includes an outer frame 1, a pair of longitudinally horizontally mounted guide rods 2, a pair of movable seats 3 that can slide back and forth along the guide rods 2, a horizontal sealing template 4 respectively mounted on the opposite sides of the two movable seats 3, a first cylinder 5 mounted on the outer wall of the outer frame 1 and driving the movable seats 3 to move, a cutting blade 6 that moves through the inner groove of one of the horizontal sealing templates 4, support rods 7 fixed at both ends of the cutting blade 6 extending out of the horizontal sealing template 4, and a second cylinder 8 that drives the cutting blade 6 to move back and forth. The second cylinder 8 is fixed on the outside of the movable seat 3 that is connected to the horizontal sealing template 4.

[0024] Each horizontal sealing template 4 has a compression plate 9 below it. The compression plate 9 is composed of a fixed plate 91 and a movable plate 92 connected by an insertion method. The insertion plate 921 at the top of the movable plate 92 is inserted into the groove of the fixed plate 91, and the extension length of the movable plate 92 is adjusted by screwing the locking bolt 93 into different positioning holes 922, thereby adjusting the size to adapt to packaging bags of different lengths.

[0025] Each fixed plate 91 has a pair of sliding rods 10 fixed on its back, and the pair of sliding rods 10 are symmetrically distributed on both sides of its vertical center plane. The end of the sliding rod 10 away from the pressing plate 9 passes through the through hole on the vertical plate 11 fixed below the movable seat 3. Each sliding rod 10 is fitted with a spring 12, which is located between the vertical plate 11 and the fixed plate 91. The tail end of the sliding rod 10 passes through the vertical plate 11 and is screwed with a nut 13 for limiting the position.

[0026] The squeeze sponge 14 is slidably embedded into the horizontal guide groove 94 on the front of the movable plate 92 and the fixed plate 91 via the guide strip 141 on its back, so as to achieve detachable installation. The two ends of the guide groove 94 pass through the two narrow sides of the movable plate 92 or the fixed plate 91, so that the guide strip 141 can be introduced from the side for replacement. The cross-section of the guide groove 94 is preferably arc-shaped, and the width of the outer port is smaller than its inner diameter, forming a snap-fit ​​effect, so that the guide strip 141 is not easy to fall out on its own after being embedded. The upper and lower ends of the squeeze sponge 14 protrude outward relative to the middle part, forming an overall concave arc-shaped structure to better fit and squeeze the packaging bag.

[0027] The entire extrusion unit includes an extrusion plate 9, extrusion sponge 14, slide rod 10, spring 12, etc. Through the sliding engagement of slide rod 10 and vertical plate 11, and the support of spring 12, an elastic floating connection is achieved relative to movable seat 3 and horizontal sealing template 4. In the natural state where spring 12 is not extruded, the distance between a pair of extrusion sponges 14 is smaller than the distance between a pair of horizontal sealing templates 4, thus realizing the pre-extrusion function.

[0028] Work process: The first cylinder 5 is in the retracted state, and the movable seat 3 drives the horizontal sealing template 4 and the entire extrusion unit below it to the open state. The packaging bag is located between a pair of horizontal sealing templates 4. Then the first cylinder 5 is activated, pushing a pair of movable seats 3 to move towards each other. Due to the natural length of the spring 12, the extrusion sponge 14 protrudes more. Therefore, the extrusion sponge 14 contacts the sides of the packaging bag before the horizontal sealing template 4. As the movable seat 3 continues to move forward, the extrusion sponge 14 begins to compress the spring 12 under the resistance of the packaging bag. During this process, the soft extrusion sponge 14 closely adheres to the bag body and applies pressure, squeezing the air in the bag upward from the sealing area.

[0029] When the movable seat 3 moves to the predetermined position, the spring 12 is compressed to a certain extent. At this time, the horizontal sealing template 4 closes, and heats and pressurizes the sealing area of ​​the degassed packaging bag to complete the heat sealing. At the same time, the second cylinder 8 is activated, driving the cutting blade 6 to complete the cutting of the upper and lower packaging bags.

[0030] Finally, the first cylinder 5 moves in the opposite direction, pulling the movable seat 3 apart. The horizontal sealing template 4 leaves the packaging bag first. As the movable seat 3 continues to move backward, the pressure acting on the squeezing sponge 14 disappears. The spring 12 pushes the fixing plate 91 and the squeezing sponge 14 to reset, separating them from the packaging bag and restoring them to their initial open state. The cut packaging bag falls down.

[0031] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0032] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A sealing structure for a vertical packaging machine, comprising an outer frame (1), a pair of guide rods (2), a pair of movable seats (3), a pair of horizontal sealing templates (4), a pair of first cylinders (5), a cutting blade (6), a pair of support rods (7), and a pair of second cylinders (8), characterized in that: Each of the horizontal sealing templates (4) is provided with an extrusion plate (9). A pair of sliding rods (10) are fixed on the opposite sides of the pair of extrusion plates (9). A spring (12) is sleeved on the outside of each sliding rod (10). A pair of upright plates (11) are fixed under the movable seat (3). The tail end of each sliding rod (10) extends through the upright plate (11) and is screwed with a nut (13). Extrusion sponges (14) are installed on the opposite sides of the pair of extrusion plates (9). When the spring (12) is not extruded, the distance between the pair of extrusion sponges (14) is less than the distance between the pair of horizontal sealing templates (4).

2. The sealing structure of a vertical packaging machine according to claim 1, characterized in that: The extrusion plate (9) includes a fixed plate (91) and a movable plate (92). The top of the movable plate (92) is provided with an insert plate (921), and the insert plate (921) is slidably inserted into the fixed plate (91). The back of the insert plate (921) is provided with a plurality of positioning holes (922) at equal intervals along the vertical direction. The back of the fixed plate (91) is screwed with a locking bolt (93), and the head end of the locking bolt (93) is used to insert into the positioning hole (922).

3. The sealing structure of a vertical packaging machine according to claim 2, characterized in that: Both the fixed plate (91) and the movable plate (92) have horizontal guide grooves (94) on the side near the squeezed sponge (14), and the back of the squeezed sponge (14) is provided with guide strips (141), which are used to slide into the guide grooves (94).

4. The sealing structure of a vertical packaging machine according to claim 3, characterized in that: The cross-sectional shape of the guide groove (94) is an arc-shaped structure, and the width of the outer port of the guide groove (94) is smaller than its inner diameter.

5. The sealing structure of a vertical packaging machine according to claim 1, characterized in that: The slide rod (10) is fixed to the back of the fixing plate (91), and the slide rod (10) is symmetrically distributed on both sides of the vertical center plane of the fixing plate (91).

6. The sealing structure of a vertical packaging machine according to claim 1, characterized in that: The upper and lower ends of the extruded sponge (14) protrude outward relative to the extrusion plate (9), while the middle part is concave inward to form an inwardly concave arc-shaped structure.

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