Bag bottom opening mechanism of packaging bag

Abstract

The utility model discloses a bag bottom opening mechanism of a packaging bag, which comprises a transmission belt and is characterized in that the transmission belt is connected with a mounting frame, the mounting frame is provided with a first rotating shaft and a second rotating shaft, the first rotating shaft is provided with a first bag opening plate, the second rotating shaft is provided with a second bag opening plate, and the first bag opening plate is provided with a first bag opening groove. The first rotating shaft is connected with a first swing arm, the second rotating shaft is connected with a second swing arm, the first swing arm and the second swing arm are connected with an elastic reset piece, a first guide piece and a second guide piece are arranged corresponding to the front bag opening station, and the first guide piece can extrude the first swing arm to swing to drive the first rotating shaft to rotate. The second guiding piece can extrude the second swing arm to swing to drive the second rotating shaft to rotate. The bag opening plate can swing outwards to be separated from the front end of the bag bottom after bag opening forming is completed, and the bag opening device is particularly suitable for forming of small-specification bag bottoms.

Description

Technical Field

[0001] The utility model relates to packaging equipment, in particular to a bag bottom opening mechanism of a packaging bag. Background Art

[0002] A bag making machine is a specialized device used to automatically form packaging bags. During the forming process, a certain type of packaging bag requires a bottom-stretching and forming mechanism to achieve the bottom of the bag.

[0003] A Chinese patent document (publication number: 104812561A; publication date: July 29, 2015) discloses a device for opening the end region of a tubular bag body, wherein at least one of the rotating arms (4, 5) is driven to be pivotable in a direction transverse to the conveying direction (T), the second end of the rotating arm (4, 5) is hinged to a supporting carrier (7), the supporting carrier (7) is driven so that the supporting carrier (7) can reciprocate on a guide rail (22) in the inclined direction (S), and one of the rotating arms (4, 5) is driven to be pivotable via a corner rod (23).

[0004] Combined with its instructions and appendix Figure 3 As can be seen from the contents of the invention, the bag support plates (23, 24) inserted into the bottom of the bag are fixed on the movable frame (11). No independent movement will occur on the moving track of the movable frame (11).

[0005] A Chinese patent document (publication number: CN 117507490 A; publication date: February 6, 2024) discloses a packaging bag bottom opening and forming mechanism, comprising a transmission belt (4), characterized in that a mounting seat (10) is connected to the transmission belt (4), a left sliding seat (8) and a right sliding seat (12) are provided on the mounting seat (10), a left bag supporting plate (7) is installed on the left sliding seat (8), and a right bag supporting plate (14) is installed on the right sliding seat (12), and guide components are provided corresponding to the left and right sliding seats, so that the left and right bag supporting plates move away from each other when about to contact the bag bottom, the distance between the left and right bag supporting plates remains unchanged after being inserted into the bag bottom, and the left and right bag supporting plates move closer to each other when about to come out of the bag bottom.

[0006] As can be seen from the description and the accompanying drawings, the left bag support plate (7) is mounted on the left sliding seat (8), and the right bag support plate (14) is mounted on the right sliding seat (12). That is, the left and right bag support plates do not move independently in the direction of the moving track of the mounting seat (10).

[0007] The above structure has the following defects: the process of the bag support plate coming out of the front end of the bag bottom can only be achieved by moving the bag support plate at a speed slower than that of the bag bottom, and the bag support plate needs to be inserted into the rear end of the bag bottom for molding after coming out of the front end of the bag bottom. Figure 4 As can be seen, the length M of the bag bottom, excluding the front end forming portion, must be greater than the length of the pouch support plate. Otherwise, the pouch support plate cannot be removed from the front end of the bag bottom, which limits the size of the bag and makes it impossible to expand and form small bag bottoms. Furthermore, in order to be inserted into the front and rear ends of the bag bottom for forming, the pouch support plate using the above solution must be shaped with outwardly convex triangular insertion portions at both the front and rear ends. This further increases the overall length of the pouch support plate, making it even more difficult to use for forming small bag bottoms. Utility Model Content

[0008] In view of the shortcomings of the background technology, the technical problem to be solved by the present invention is to provide a bag bottom expansion mechanism for a packaging bag for solving the above-mentioned problem.

[0009] To this end, the present invention is implemented by adopting the following scheme:

[0010] A bag bottom opening mechanism for a packaging bag includes a transmission belt, and is characterized in that: a mounting frame is connected to the transmission belt, a first rotating shaft and a second rotating shaft are provided on the mounting frame, a first bag supporting plate is provided on the first rotating shaft, a second bag supporting plate is provided on the second rotating shaft, a first swing arm is connected to the first rotating shaft, a second swing arm is connected to the second rotating shaft, the first and second swing arms are connected to an elastic reset member, and a first guide member and a second guide member are provided corresponding to the front bag supporting station, the first guide member can squeeze the first swing arm to swing and drive the first rotating shaft to rotate, and the second guide member can squeeze the second swing arm to swing and drive the second rotating shaft to rotate.

[0011] The rotation drive assembly includes a first swing arm connected to the first rotating shaft, and a second swing arm connected to the second rotating shaft. The first and second swing arms are connected by a reset spring. A first guide and a second guide are provided corresponding to the front bag station. The first guide can squeeze the first swing arm to swing and drive the first rotating shaft to rotate, and the second guide can squeeze the second swing arm to swing and drive the second rotating shaft to rotate.

[0012] The first rotating shaft is connected to a first positioning arm, the second rotating shaft is connected to a second positioning arm, and the mounting frame is provided with a first positioning block that can abut against the first positioning arm, and a second positioning block that can abut against the second positioning arm.

[0013] The first swing arm and the second swing arm are provided with rollers, and the rollers can abut against the first and second guide members.

[0014] The first guide member and the second guide member are provided with inclined surfaces that contact the first swing arm and the second swing arm.

[0015] When the first and second swing arms contact and squeeze the first and second guide members and swing, they drive the first and second rotating shafts to rotate, so that the first and second bag-opening plates swing and insert into the front end of the bag bottom to open and form.

[0016] When the first and second swing arms are separated from the first and second guide members, the elastic reset member drives the first and second swing arms to reset and swing, so that the first and second rotating shafts drive the first and second bag-stretching plates to swing to the reset angle and completely disengage from the front end of the bag bottom. At this time, the angle position of the first and second bag-stretching plates can be directly inserted into the rear end of the bag bottom for expansion and forming.

[0017] The first bag-supporting plate and the second bag-supporting plate are arranged in an approximately triangular shape.

[0018] The above technical solution is a bag bottom support mechanism for a packaging bag, which arranges the first and second bag support plates on the first and second rotating shafts, and drives the first and second rotating shafts to rotate through the structure of the swing arm and the guide member, so that the first and second bag support plates can be driven to swing, so that the bag support plates can swing to the inside of the front end of the bag bottom to assist in forming when contacting and forming with the front end of the bag bottom. After the front end of the bag bottom is formed, the elastic reset member can drive the bag support plates to swing out of the front end of the bag bottom. In this way, the length of the bag bottom will not be limited by the bag support plates, which can facilitate the bag support forming processing of small-sized bag bottoms. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The utility model has the following drawings:

[0020] Figure 1 It is a structural diagram of the utility model;

[0021] Figure 2 for Figure 1 A partial enlarged view of the area pointed by A in the middle;

[0022] Figure 3 for Figure 1 A view from another perspective;

[0023] Figure 4 This is a view of the first and second bag-supporting plates of the present invention when inserted into the front end of the bag bottom for forming;

[0024] Figure 5 This is a view of the first and second bag-supporting plates of the present invention when they are swung out of the front end of the bag bottom;

[0025] Figure 6 This is a view of the first and second bag-supporting plates of the present invention when inserted into the rear end of the bag bottom to form the bag. DETAILED DESCRIPTION

[0026] As shown in the figure, the present invention discloses a bag bottom opening mechanism for a packaging bag, comprising a transmission belt 1, a mounting frame 11 connected to the transmission belt 1, a first rotating shaft 7 and a second rotating shaft 14 provided on the mounting frame 11, a first bag-holding plate 5 provided on the first rotating shaft 7, a second bag-holding plate 17 provided on the second rotating shaft 14, a first swing arm 10 connected to the first rotating shaft 7, a second swing arm 13 connected to the second rotating shaft 14, and the first and second swing arms connected to elastic return members. In this embodiment, the first and second swing arms are connected by a return spring 12 to achieve elastic swing return. Of course, the first swing arm 10 can also be connected to the mounting frame 11 by an independent spring, and the second swing arm 13 can also be connected to the mounting frame 11 by an independent spring. A first guide member 4 and a second guide member 18 are provided corresponding to the front bag-holding station. The first guide member 4 can squeeze the first swing arm 10 to swing and drive the first rotating shaft 7 to rotate, and the second guide member 18 can squeeze the second swing arm 13 to swing and drive the second rotating shaft 14 to rotate. With the above structure, when the transmission belt 1 drives the mounting frame 11 to move to the front bag supporting station, the first and second swing arms will contact and squeeze the first and second guide members, causing the first and second swing arms to swing, thereby driving the first and second rotating shafts to rotate, causing the first and second bag supporting plates to swing and insert into the front end 3 of the bag bottom to form the front end of the bag bottom. After the forming is completed, the first and second swing arms will separate from the first and second guide members. At this time, the reset spring 12 will drive the first and second swing arms to swing back and reset, causing the first and second bag supporting plates to swing back and then disengage from the front end 3 of the bag bottom that has been opened.

[0027] Furthermore, the first rotating shaft 7 is connected to the first positioning arm 6, the second rotating shaft 14 is connected to the second positioning arm 16, and the mounting frame 11 is provided with a first positioning block 8 that can be abutted against the first positioning arm 6, and a second positioning block 15 that can be abutted against the second positioning arm 16, which can realize the angular positioning of the first and second rotating shafts, and also realize the angular positioning of the first and second bag-supporting plates when they are reset and swung back.

[0028] Furthermore, rollers 9 are provided on the first swing arm 10 and the second swing arm 13, and the rollers 9 can abut against the first and second guide members. This rolling contact fit makes the contact and extrusion fit between the first and second swing arms and the first and second guide members smoother.

[0029] Furthermore, the first guide member 4 and the second guide member 18 are provided with inclined surfaces that contact the first swing arm 10 and the second swing arm 13, so that the initial contact and extrusion between the guide member and the swing arm is smoother.

[0030] Furthermore, when the first and second swing arms contact and squeeze the first and second guide members and swing, they drive the first and second rotating shafts to rotate, causing the first and second bag-opening plates to swing and insert into the front end 3 of the bag bottom to open and form the bag, so that the opening and forming operation of the front end 3 of the bag bottom can be carried out smoothly.

[0031] Furthermore, after the first and second swing arms separate from the first and second guide members, the elastic return member drives the first and second swing arms to return to their original position, causing the first and second rotating shafts to drive the first and second bag-stretching plates to swing to their original position and completely disengage from the front end 3 of the bag bottom. At this point, the first and second bag-stretching plates are positioned so that they can be directly inserted into the rear end 19 of the bag bottom for expansion and molding. In this way, the first and second bag-stretching plates, after being released from the front end 3 of the bag bottom, can be directly inserted into the rear end 19 of the bag bottom for expansion and molding without the need for further swinging, thereby simplifying their movement.

[0032] Furthermore, the first bag-supporting plate 5 and the second bag-supporting plate 17 are arranged in a substantially triangular shape. Since the first and second bag-supporting plates in the present application can swing on their own, it is not necessary to set a triangular shape structure at both ends. Setting them in a single substantially triangular shape makes them smaller and can better adapt to the molding of small-sized bag bottoms.

[0033] The working principle of the utility model is as follows: the bag bottom 2 is sent to the bag bottom forming station by the lower conveyor belt, and the transmission belt 1 drives the mounting frame 11 to move, so that the first and second bag-supporting plates are first moved to the front end 3 of the bag bottom. At this time, the first and second guide members squeeze the first and second swing arms to swing, so that the first and second rotating shafts rotate, driving the first and second bag-supporting plates to swing and insert into the front end 3 of the bag bottom to expand and form. In this forming process, the bag bottom 2 and the moving frame 11 are both in a moving state. After the forming is completed, the first and second swing arms will be aligned with the first , and the second guide member is separated. At this time, the return spring 12 will drive the first and second swing arms to swing back, and then drive the first and second bag-supporting plates to swing back and completely disengage from the front end 3 of the bag bottom. At this time, the angles of the first and second bag-supporting plates can be directly inserted into the rear end 19 of the bag bottom to be stretched and formed. As the bag bottom 2 continues to move, the first and second bag-supporting plates will be inserted into the rear end 19 of the bag bottom 2 to achieve the forming of the rear end 19 of the bag bottom. Finally, the transmission belt 1 will drive the mounting frame 11 to swing upward, so that the first and second bag-supporting plates are disengaged from the rear end 19 of the bag bottom 2.

[0034] According to the structure of the present invention, after the front end of the bag bottom is formed, the bag-supporting plate can swing out of the front end of the bag bottom by itself. In this way, the length of the bag bottom will not be limited by the bag-supporting plate, and the bag-supporting forming process of small-sized bag bottoms can be carried out conveniently.

Claims

1. A bag bottom opening mechanism for a packaging bag, comprising a transmission belt (1), characterized in that: A mounting frame (11) is connected to the transmission belt (1), and a first rotating shaft (7) and a second rotating shaft (14) are provided on the mounting frame (11). A first bag-supporting plate (5) is provided on the first rotating shaft (7), and a second bag-supporting plate (17) is provided on the second rotating shaft (14). A first swing arm (10) is connected to the first rotating shaft (7), and a second swing arm (13) is connected to the second rotating shaft (14). The first and second swing arms are connected to an elastic reset member. A first guide member (4) and a second guide member (18) are provided corresponding to the front bag-supporting station. The first guide member (4) can squeeze the first swing arm (10) to swing and drive the first rotating shaft (7) to rotate, and the second guide member (18) can squeeze the second swing arm (13) to swing and drive the second rotating shaft (14) to rotate.

2. The bag bottom opening mechanism of a packaging bag according to claim 1, characterized in that: The first rotating shaft (7) is connected to a first positioning arm (6), the second rotating shaft (14) is connected to a second positioning arm (16), and the mounting frame (11) is provided with a first positioning block (8) that can abut against the first positioning arm (6), and a second positioning block (15) that can abut against the second positioning arm (16).

3. The bag bottom opening mechanism of a packaging bag according to claim 1, characterized in that: Rollers (9) are provided on the first swing arm (10) and the second swing arm (13), and the rollers (9) can abut against the first and second guide members.

4. The bag bottom opening mechanism of a packaging bag according to claim 1, characterized in that: The first guide member (4) and the second guide member (18) are provided with inclined surfaces that contact the first swing arm (10) and the second swing arm (13).

5. The bag bottom opening mechanism of a packaging bag according to claim 1, characterized in that: When the first and second swing arms contact and squeeze the first and second guide members and swing, they drive the first and second rotating shafts to rotate, so that the first and second bag-supporting plates swing and insert into the front end (3) of the bag bottom to expand and form.

6. The bottom opening mechanism of a packaging bag according to claim 1 or 2, characterized in that: When the first and second swing arms are separated from the first and second guide members, the elastic reset member drives the first and second swing arms to reset and swing, so that the first and second rotating shafts drive the first and second bag-supporting plates to swing to the reset angle and completely disengage from the front end (3) of the bag bottom. At this time, the angle position of the first and second bag-supporting plates can be directly inserted into the rear end (19) of the bag bottom to expand and form.

7. The bag bottom opening mechanism of a packaging bag according to claim 1, characterized in that: The first bag-supporting plate (5) and the second bag-supporting plate (17) are arranged in an approximately triangular shape.

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