Bag bottom opening mechanism of packaging bag

Abstract

The utility model discloses a bag bottom opening mechanism of a packaging bag, relates to the technical field of packaging bag processing, and aims to solve the technical problem of low opening quality of the bag bottom of the current packaging bag, the bag bottom opening mechanism comprises an adjusting mechanism and an opening piece arranged on the adjusting mechanism, the adjusting mechanism comprises a base plate, a threaded rod is rotatably mounted at the center of the top surface of the base plate, and the opening piece is arranged on the base plate. A lifting seat is installed on the threaded rod in a threaded mode, first positioning grooves distributed at equal intervals are formed in the top face of the base plate in an array mode, second positioning grooves are formed in the outer surface of the lifting seat at equal intervals, and the multiple opening pieces are slidably installed on the lifting seat through the first positioning grooves and the second positioning grooves. The distraction piece sequentially comprises a first positioning part, a second positioning part, a first distraction part and a second distraction part in the long axis direction. According to the utility model, the pyramid-shaped lifting seat is driven by the motor and is matched with the radial positioning groove, so that the opening pieces are synchronously and uniformly expanded, the opening amplitude of each area of the bag bottom is ensured to be consistent, and the opening quality is improved.

Description

Technical Field

[0001] This utility model relates to the field of packaging bag processing technology, and more specifically, to a bottom opening mechanism for a packaging bag. Background Technology

[0002] Packaging bags, as an indispensable carrier in modern life and business scenarios, combine practical functions with visual value, providing comprehensive protection for the storage, transportation, and sale of goods. In terms of materials, they encompass various types such as plastic, paper, non-woven fabric, and metal foil. Plastic packaging bags, with their advantages of being waterproof, wear-resistant, and low-cost, are widely used in food and daily necessities packaging. The production and processing of packaging bags requires opening the bottom of the bag to produce packaging bags with different bottoms.

[0003] Currently, the bottom opening mechanism for packaging bags mainly uses two plates to expand from the left and right sides or four plates to expand from the four sides, causing the bottom of the packaging bag to deform and expand. However, the large contact area between the plate structure and the packaging bag, along with uneven stress distribution, not only affects the quality of the opening but also makes the local compressive stress on the packaging bag prone to exceeding the material's tensile strength and causing rupture. Therefore, we propose a bottom opening mechanism for packaging bags. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the existing technology, adapt to the needs of reality, and provide a bottom opening mechanism for packaging bags to solve the technical problem of low bottom opening quality of current packaging bags.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a bottom opening mechanism for a packaging bag, comprising an adjustment mechanism and opening components disposed on the adjustment mechanism. The adjustment mechanism includes a base plate, a threaded rod rotatably mounted at the center of the top surface of the base plate, a motor for driving the threaded rod disposed on the bottom surface of the base plate, a lifting seat threadedly mounted on the threaded rod, a first positioning groove evenly distributed in an array on the top surface of the base plate, a second positioning groove evenly distributed on the outer surface of the lifting seat, and several opening components slidably mounted on the lifting seat and the lifting seat through the first positioning groove and the second positioning groove. The opening components sequentially include a first positioning part, a second positioning part, a first opening part, and a second opening part along the long axis direction.

[0006] Preferably, the base plate is arranged in a cross shape, and a mounting plate is symmetrically arranged on the bottom surface of the base plate, with fixing holes provided on the mounting plate.

[0007] Preferably, the cross-sectional area of ​​the lifting seat gradually decreases from bottom to top, and the lifting seat is shaped like a frustum pyramid.

[0008] Preferably, a plurality of the first positioning grooves and a plurality of the second positioning grooves are arranged radially outward, with the first positioning grooves and the second positioning grooves corresponding to each other.

[0009] Preferably, positioning rods are symmetrically arranged on the base plate, and positioning holes are symmetrically opened on the lifting seat, with the positioning rods located inside the positioning holes.

[0010] Preferably, both the first positioning part and the second positioning part are L-shaped. A first limiting slider is rotatably installed at the beginning of the first positioning part and is slidably installed in the first positioning groove. A second limiting slider is rotatably installed at the connection between the first positioning part and the second positioning part and is slidably installed in the second positioning groove. The second supporting part is curved inward in an arc shape.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] 1. This utility model, through the design of a base plate and lifting seat structure, uses a motor-driven threaded rod to vertically raise and lower the lifting seat. Utilizing the characteristic that the cross-sectional area of ​​the truncated pyramid gradually decreases from bottom to top, its contact position with the expanding component is changed. The first and second positioning grooves both radiate outwards and correspond one-to-one. Combined with the truncated pyramid structure of the lifting seat, the expanding component is driven to expand synchronously and evenly from the center of the mechanism outwards. This movement ensures that the expansion amplitude of each area of ​​the bottom of the packaging bag is consistent, avoiding local over-expansion or under-expansion, effectively improving the quality of the bag bottom expansion, preventing uneven expansion and the risk of breakage, meeting the precise requirements of subsequent processing for the bag bottom shape, and allowing adjustment of the bag bottom expansion amplitude to adapt to the processing needs of different packaging bags. It eliminates the need for frequent replacement of the expanding components, improves production efficiency, and solves the current problem of low quality bag bottom expansion.

[0013] 2. This utility model also designs an opening component structure. The opening component slides with the first positioning slider of the first positioning part and the second positioning slider of the second positioning part, respectively, and is in slidable engagement with the first positioning groove of the base plate and the second positioning groove of the lifting seat. The first positioning groove and the second positioning groove are radially corresponding one-to-one. When the lifting seat is raised and lowered, it can synchronously drive all opening components to expand radially and uniformly from the center of the mechanism to ensure that the opening amplitude of each area of ​​the bottom of the packaging bag is consistent, avoiding the problem of local over-expansion or under-expansion in the traditional plate-shaped opening method. The second opening part of the opening component adopts an inward curved arc design. In the lower to middle area of ​​the packaging bag, the arc structure can reduce the local expansion force, so that the unexpanded area of ​​the packaging bag and the expanded area are perfectly transitioned, significantly improving the quality and aesthetics of the packaging bag during the opening process. Attached Figure Description

[0014] Figure 1 This is a front view structural diagram of the present utility model;

[0015] Figure 2 This is a bottom view of the structure of this utility model;

[0016] Figure 3 This is a cross-sectional structural diagram of the present invention;

[0017] Figure 4 This is a schematic diagram of the support structure of this utility model;

[0018] Figure 5 This is an enlarged structural diagram of the support member of this utility model;

[0019] Figure 6 This is a schematic diagram of one usage state of the present invention.

[0020] The following are the labels in the diagram: 100, Adjustment mechanism; 101, Base plate; 102, Mounting plate; 103, Threaded rod; 104, Motor; 105, Positioning rod; 106, Lifting seat; 107, First positioning groove; 108, Second positioning groove; 201, Spreading component; 202, First positioning part; 203, Second positioning part; 204, First spreading part; 205, Second spreading part; 206, Second limiting slider; 207, First limiting slider. Detailed Implementation

[0021] like Figures 1 to 6 As shown, the present invention relates to a bottom opening mechanism for a packaging bag, comprising an adjusting mechanism 100 and opening members 201 provided on the adjusting mechanism 100. The adjusting mechanism 100 includes a base plate 101, a threaded rod 103 rotatably mounted at the center of the top surface of the base plate 101, a motor 104 for driving the threaded rod 103 provided on the bottom surface of the base plate 101, a lifting seat 106 threadedly mounted on the threaded rod 103, a first positioning groove 107 equally spaced open array on the top surface of the base plate 101, and a second positioning groove 108 equally spaced open on the outer surface of the lifting seat 106. A plurality of opening members 201 are slidably mounted on the lifting seat 106 and the lifting seat 106 through the first positioning groove 107 and the second positioning groove 108. The opening members 201 sequentially include a first positioning part 202, a second positioning part 203, a first opening part 204 and a second opening part 205 along the long axis direction. This utility model uses a motor 104 to drive a pyramidal lifting seat 106, which, in conjunction with radial positioning grooves, enables the expansion member 201 to expand synchronously and uniformly, ensuring that the expansion amplitude of each area of ​​the bag bottom is consistent, and effectively improving the expansion quality of the packaging bag.

[0022] Specifically, the base plate 101 is arranged in a cross shape, and a mounting plate 102 is symmetrically arranged on the bottom surface of the base plate 101. The mounting plate 102 has fixing holes. The cross-shaped design makes the supporting force of the base plate 101 more balanced, and at the same time provides uniform installation space for multiple supporting parts 201. The symmetrical mounting plate 102 and fixing holes make it easy to fix the entire mechanism in the designated position on the packaging bag processing production line by bolts and other connecting parts, so as to avoid shaking during the operation of the mechanism.

[0023] Furthermore, the cross-sectional area of ​​the lifting seat 106 gradually decreases from bottom to top, and the lifting seat 106 is shaped like a frustum of a pyramid. The shape of the frustum of a pyramid causes the contact position between the outer surface of the lifting seat 106 and the spreading member 201 to change regularly during the up and down movement, which in turn drives the spreading member 201 to adjust its position along the radial direction, creating conditions for changing the opening amplitude of the bag bottom.

[0024] It is worth noting that the first positioning grooves 107 and the second positioning grooves 108 are arranged radially outwards, with the first positioning grooves 107 and the second positioning grooves 108 corresponding to each other. The radially distributed first positioning grooves 107 and second positioning grooves 108 allow the expanding member 201 to expand evenly from the center of the mechanism to all sides, ensuring that the degree of expansion is consistent in all areas of the bottom of the packaging bag. The corresponding arrangement of the grooves ensures that the expanding member 201 maintains the stability of its movement trajectory during sliding, preventing deviation that could lead to a decrease in the quality of expansion.

[0025] It is worth mentioning that positioning rods 105 are symmetrically arranged on the base plate 101, and positioning holes are symmetrically opened on the lifting seat 106, with the positioning rods 105 located in the positioning holes. The cooperation between the positioning rods 105 and the positioning holes can restrict the rotation of the lifting seat 106, so that the lifting seat 106 can only move up and down in the vertical direction. This avoids jamming of the threaded connection between the threaded rod 103 and the lifting seat 106 due to the rotation of the lifting seat 106, ensuring smooth operation of the mechanism.

[0026] It is worth noting that both the first positioning part 202 and the second positioning part 203 are L-shaped. The first positioning part 202 has a first limiting slider 207 rotatably mounted at its starting end, which is slidably mounted in the first positioning groove 107. The first limiting slider 206 is rotatably mounted at the connection between the first positioning part 202 and the second positioning part 203, which is slidably mounted in the second positioning groove 108. The second opening part 205 is curved inward in an arc shape. The L-shaped positioning part facilitates a flexible rotation and sliding connection between the slider and the positioning groove, allowing the opening member 201 to adjust its position as the lifting seat 106 moves. The arc-shaped second opening part 205 is located from the bottom to the middle of the packaging bag, thereby reducing the expansion force from the bottom to the middle of the packaging bag, ensuring that the packaging bag is opened evenly while preventing excessive opening in the middle. Together with the outwardly radially expanding opening member 201, the bottom of the packaging bag can be opened evenly, dispersing contact stress and preventing the bottom of the bag from being stretched and broken due to excessive local pressure, thus improving the opening quality.

[0027] Working principle: This embodiment provides a bottom opening mechanism for packaging bags. In use, the entire mechanism is first installed securely at the designated work position on the packaging bag processing production line by means of the mounting plate 102 symmetrically arranged on the bottom surface of the base plate 101 and the fixing holes on the plate, and bolts and other connecting parts, to ensure that the mechanism will not shake during operation, thus laying the foundation for subsequent stable operation.After installation, place the packaging bag with the bottom to be opened on the mechanism, so that the bottom of the bag is fitted onto the outside of the first opening part 204 and the second opening part 205 of the several opening parts 201. Then, start the motor 104 on the bottom surface of the base plate 101 that drives the threaded rod 103. The motor 104 drives the threaded rod 103 to rotate around its own axis. Since the threaded rod 103 and the lifting seat 106 are connected by threads, and the positioning rods 105 symmetrically arranged on the base plate 101 pass through the positioning holes of the lifting seat 106, the positioning rods 105 limit the lifting seat 106, preventing the lifting seat 106 from rotating synchronously with the threaded rod 103. This ensures that the lifting seat 106 can only move vertically up and down along the axis of the threaded rod 103. The lifting seat 106 is a frustum-shaped pyramid with a gradually decreasing cross-sectional area from bottom to top. Second positioning grooves 108, evenly spaced on its outer surface, correspond to and are radially distributed with first positioning grooves 107 arrayed on the top surface of the base plate 101. Second positioning sliders 206 and 207 on the support member 201 are slidably mounted on the second positioning grooves 108 and 107, respectively. The first positioning part 202 and the second positioning part 203 of the support member 201 are both L-shaped. The beginning of the first positioning part 202 is rotatably connected to the first limiting slider 207, and the connection between the first positioning part 202 and the second positioning part 203 is rotatably connected to the second limiting slider 206. When the lifting seat 106 moves upward under the drive of the threaded rod 103, the frustum-shaped pyramid... The outer surface of the lifting seat 106 exerts an outward pushing force on the second limiting slider 206, causing the second limiting slider 206 to slide outward along the second positioning groove 108. Simultaneously, it drives the second positioning part 203 of the expanding member 201 to move synchronously, while the first limiting slider 207 slides outward within the first positioning groove 107. This causes the entire expanding member 201 to unfold outward along the radial direction. During the unfolding process, the first expanding part 204, which is arranged along its long axis, and the second expanding part 205, which is curved inward, will contact the inner wall of the bottom of the packaging bag. The curved second expanding part 205 corresponds to the lower to middle position of the packaging bag, which can relatively reduce the expansion force in this area, preventing excessive expansion in the middle. This, combined with the radial... The uniformly expanding support 201 evenly distributes the contact stress on the bottom of the packaging bag, effectively preventing the bottom from tearing due to local pressure exceeding the material's tolerance limit. This achieves high-quality opening of the bag bottom. When adjusting the opening range, the lifting height of the lifting seat 106 can be changed by controlling the forward and reverse rotation of the motor 104. The higher the lifting seat 106 rises, the greater the thrust on the second limit slider 206, resulting in a larger outward expansion of the support 201 and a greater degree of bag bottom opening. Conversely, a smaller lifting distance results in a smaller outward expansion range of the support 201, thus adapting to different opening requirements and meeting the processing needs of various packaging bag sizes.

[0028] The embodiments disclosed herein are preferred embodiments, but are not limited thereto. Those skilled in the art can readily grasp the spirit of this utility model based on the above embodiments and make different extensions and variations. However, as long as they do not depart from the spirit of this utility model, they are all within the protection scope of this utility model.

Claims

1. A bottom opening mechanism for a packaging bag, characterized in that, The system includes an adjustment mechanism (100) and a support member (201) provided on the adjustment mechanism (100). The adjustment mechanism (100) includes a base plate (101). A threaded rod (103) is rotatably mounted at the center of the top surface of the base plate (101). A motor (104) for driving the threaded rod (103) is provided on the bottom surface of the base plate (101). A lifting seat (106) is threaded onto the threaded rod (103). The top surface of the base plate (101) has an array of equally spaced... The first positioning groove (107) of the cloth, the second positioning groove (108) is equally spaced on the outer surface of the lifting seat (106), and a plurality of the supporting members (201) are slidably installed on the lifting seat (106) and the lifting seat (106) through the first positioning groove (107) and the second positioning groove (108). The supporting member (201) includes a first positioning part (202), a second positioning part (203), a first supporting part (204) and a second supporting part (205) in sequence along the long axis direction.

2. The bottom opening mechanism of a packaging bag according to claim 1, characterized in that, The base plate (101) is arranged in a cross shape, and the bottom surface of the base plate (101) is symmetrically provided with a mounting plate (102), and the mounting plate (102) is provided with fixing holes.

3. The bottom opening mechanism of a packaging bag according to claim 2, characterized in that, The lifting seat (106) is configured such that the cross-sectional area gradually decreases from bottom to top, and the lifting seat (106) is configured in the shape of a frustum pyramid.

4. The bottom opening mechanism of a packaging bag according to claim 3, characterized in that, A plurality of first positioning grooves (107) and a plurality of second positioning grooves (108) are arranged radially outward, with the first positioning grooves (107) and the second positioning grooves (108) corresponding to each other.

5. The bottom opening mechanism of a packaging bag according to claim 4, characterized in that, The base plate (101) is symmetrically provided with positioning rods (105), and the lifting seat (106) is symmetrically provided with positioning holes, with the positioning rods (105) located in the positioning holes.

6. The bottom opening mechanism of a packaging bag according to claim 5, characterized in that, The first positioning part (202) and the second positioning part (203) are both L-shaped. The first positioning part (202) is rotatably mounted with a first limiting slider (207). The first limiting slider (207) is slidably mounted in the first positioning groove (107). The first positioning part (202) and the second positioning part (203) are rotatably mounted with a second limiting slider (206) at the connection. The second limiting slider (206) is slidably mounted in the second positioning groove (108). The second supporting part (205) is curved inward in an arc shape.

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