Bag opening mechanism for a dosing scale

Abstract

This utility model relates to the field of quantitative packaging scales, specifically to a bag-supporting mechanism for quantitative packaging scales. It includes a bag-supporting frame, a main body for supporting the packaging bag, an input pipe fixedly installed above the bag-supporting frame for docking with the quantitative packaging scale, and an output pipe fixedly installed at the bottom of the bag-supporting frame. A fixing frame is fixedly installed at the bottom of the bag-supporting frame, and a first bag-supporting clamping frame is rotatably connected to the outside of the fixing frame. This utility model includes a first bag-supporting clamping frame, an annular clamping hoop, a second bag-supporting clamping frame, a linkage plate, suction chambers, a suction port, and a bottom cover plate. When using this bag-supporting mechanism for quantitative packaging scales, the packaging bag can first be placed between the two suction chambers. The negative pressure generated by the suction port suctions the outer sides of the packaging bag. Then, the second telescopic cylinder extends outward, causing the suction chambers to open the packaging bag. Finally, driven by the moving frame, the packaging bag is positioned over the output pipe.

Description

Technical Field

[0001] This utility model relates to the field of quantitative packaging scales, specifically to a bag-supporting mechanism for quantitative packaging scales. Background Technology

[0002] A quantitative packaging scale is an automated weighing and packaging device. Its core function is to accurately dispense bulk materials such as granules, powders, and liquids into packaging bags according to preset weights and complete subsequent processes such as sealing. It is widely used in food, chemical, agricultural, and pharmaceutical industries. The bag support mechanism of the quantitative packaging scale is a key component, responsible for fixing, supporting, and stabilizing the packaging bag during the filling process to ensure that the material falls accurately into the bag.

[0003] A search revealed a bag-supporting mechanism for a quantitative packaging scale, with publication number CN220181234U. This mechanism addresses the problem in existing technologies where the loading and unloading of packaging bags requires significant time, increasing workload and providing limited convenience, ultimately leading to longer production times. The new mechanism includes a mounting block with structural blocks fixedly connected to both sides. A horizontal crossbar is installed within the inner cavity of each structural block. This design allows for quick and efficient bag opening, providing stable support during raw material loading. It improves ease of use with the scale, eliminates unnecessary steps, and increases work efficiency.

[0004] Existing bag-supporting mechanisms for quantitative packaging scales lack dual-clamping stability during use, leading to unstable clamping. Single-point clamping or the absence of a ring-shaped clamping structure causes bags to loosen during filling, resulting in material leakage or bag detachment. This poses a higher risk, especially when handling fine powders or liquids. Furthermore, the bag-supporting mechanisms in the aforementioned comparative case also lack dual-clamping stability. Over time, the lack of bottom support can cause the bottom of the bag to sag or deform during filling, increasing the breakage rate.

[0005] Therefore, it is necessary to invent a bag-supporting mechanism for quantitative packaging scales to solve the above problems. Utility Model Content

[0006] The purpose of this invention is to provide a bag-supporting mechanism for a quantitative packaging scale. Through a first bag-supporting clamping frame, an annular clamping hoop, a second bag-supporting clamping frame, a linkage plate, a suction cavity, a suction port, and a bottom cover plate, this mechanism achieves a double-clamping and stable fixing capability. The annular clamping hoop clamps the upper half of the bag opening outside the output pipe, while the suction cavity simultaneously fits against the lower half, forming a double-clamping structure. This enhances the bag opening's sealing performance, preventing material leakage during filling, and is particularly suitable for packaging powder or fine granular materials. Furthermore, the bottom cover plate provides bottom support as the bag rises, preventing the bag from sagging or deforming during filling. This structure reduces... This invention addresses the issue of stress concentration at the bottom of the bag, reducing the risk of breakage. It solves the problem of existing bag-supporting mechanisms in quantitative packaging scales lacking dual-clamping stability, leading to unstable clamping, single-point clamping, or the absence of a ring-shaped clamping structure. This causes the bag to loosen during filling, resulting in material leakage or bag detachment, especially when handling fine powders or liquids. Furthermore, the bag-supporting mechanism in the aforementioned comparative case also lacks dual-clamping stability, which, with prolonged use, leads to sagging or deformation of the bottom during filling, increasing the breakage rate.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a bag-supporting mechanism for a quantitative packaging scale, comprising a bag-supporting frame and a main body for supporting the packaging bag;

[0008] An input pipe is fixedly installed above the bag support frame for docking with a quantitative packaging scale. An output pipe is fixedly installed at the bottom of the bag support frame. A fixed frame is fixedly installed at the bottom of the bag support frame. A first bag support clamping frame is rotatably connected to the outside of the fixed frame. A connecting rod is fixedly installed at the bottom of the first bag support clamping frame. An annular clamping hoop is fixedly installed on the outside of the connecting rod.

[0009] The second bag-holding clamp is rotatably connected to the other side of the fixed frame for cooperation with the first bag-holding clamp. The second bag-holding clamp is fixedly mounted on the outside of the first telescopic cylinder. The front end of the first telescopic cylinder is fixedly connected to the outside of the first bag-holding clamp. The outside of each bag-holding frame is provided with a fixed sliding groove. A fixed slider is slidably connected inside the fixed sliding groove. A movable frame is fixedly mounted on the outside of the fixed slider.

[0010] The second telescopic cylinder is fixedly installed on the outside of the movable frame for telescopic movement. A linkage plate is fixedly installed at the front end of the second telescopic cylinder. A suction cavity is fixedly installed on the outside of the linkage plate. Suction ports are fixedly installed on the outside of the suction cavity. Fixed bolts are threaded through the top of the movable frame. A connecting frame is threaded to the bottom end of the fixed bolts. A bottom cover plate is fixedly installed at the bottom of the connecting frame.

[0011] Preferably, the movable frame is slidably connected to the bag support frame, and the fixed slide groove is used in conjunction with the fixed slider.

[0012] Preferably, the number of suction ports is set to multiple, and the multiple suction ports are distributed at equal intervals on the suction cavity.

[0013] Preferably, a vacuum pump is fixedly installed at the bottom of the movable frame, and an air extraction pipe is fixedly installed on the outside of the vacuum pump. The other end of the air extraction pipe is fixedly connected to the outside of the suction cavity.

[0014] Preferably, an external plate is fixedly installed on the outside of the bag support frame, a servo motor is fixedly installed on the top of the external plate, and a threaded screw is fixedly installed on the output end of the servo motor.

[0015] Preferably, the threaded screw is rotatably connected to a threaded sleeve, and the outside of the threaded sleeve is fixedly connected to the outside of the movable frame.

[0016] The technical effects and advantages provided by this utility model in the above technical solution are as follows:

[0017] This utility model is equipped with a first bag-supporting clamping frame, an annular clamping hoop, a second bag-supporting clamping frame, a linkage plate, a suction cavity, a suction port, and a bottom cover plate. When using the bag-supporting mechanism of this quantitative packaging scale, the packaging bag can first be placed between the two suction cavities. The negative pressure generated by the suction port sucks up the outer sides of the packaging bag. Then, the second telescopic cylinder extends and retracts outward, causing the suction cavity to open the packaging bag. Next, driven by the moving frame, the packaging bag is placed on the outside of the output tube. As the first telescopic cylinder extends and retracts, the first and second bag-supporting clamping frames move closer together. The annular clamping hoop clamps the upper half of the bag opening on the output tube. Subsequently... The suction chamber also fits against the lower half of the bag opening, and then the output tube clamps the bag against it. Finally, the bottom support plate, which rises along with it, provides bottom support for the bag. This gives the bag support mechanism of the quantitative packaging scale a double clamping and stable fixing capability. The upper half of the bag opening is clamped outside the output tube by a ring clamping hoop, while the lower half is fitted with the suction chamber to form a double clamping structure, which enhances the sealing of the bag opening and prevents material leakage during filling. It is especially suitable for packaging powder or fine granular materials. Moreover, the bottom support plate provides bottom support as the bag rises, preventing the bag from sagging or deforming during filling. This structure reduces stress concentration at the bottom of the bag and reduces the risk of breakage. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the output tube structure of this utility model;

[0021] Figure 3 This is a schematic diagram of the mobile frame structure of this utility model;

[0022] Figure 4 This is a schematic diagram of the bottom cover structure of this utility model;

[0023] Figure 5 This is a schematic diagram of the threaded screw structure of this utility model.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Bag support frame; 2. Input pipe; 3. Output pipe; 4. Fixing frame; 5. First bag support clamping frame; 6. Connecting rod; 7. Ring clamping hoop; 8. Second bag support clamping frame; 9. First telescopic cylinder; 10. Fixed slide groove; 11. Fixed slider; 12. Moving frame; 13. Second telescopic cylinder; 14. Linkage plate; 15. Suction support cavity; 16. Suction port; 17. Fixing bolt; 18. Connecting frame; 19. Bottom cover plate; 20. Vacuum pump; 21. Air extraction pipe; 22. External plate; 23. Servo motor; 24. Threaded screw; 25. Threaded sleeve. Detailed Implementation

[0026] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0027] This utility model provides, for example Figure 1-5 The illustrated bag-supporting mechanism for a quantitative packaging scale includes a bag-supporting frame 1, which is a main body for supporting the packaging bag;

[0028] The input pipe 2 is fixedly installed above the bag support frame 1 for docking with the quantitative packaging scale. The output pipe 3 is fixedly installed at the bottom of the bag support frame 1. The fixed frame 4 is fixedly installed at the bottom of the bag support frame 1. The first bag support clamping frame 5 is rotatably connected to the outside of the fixed frame 4. The connecting rod 6 is fixedly installed at the bottom of the first bag support clamping frame 5. The annular clamping hoop 7 is fixedly installed on the outside of the connecting rod 6.

[0029] The second bag-holding clamping frame 8 is rotatably connected to the other side of the fixed frame 4 and is used to cooperate with the first bag-holding clamping frame 5. The second bag-holding clamping frame 8 is fixedly installed with a first telescopic cylinder 9. The front end of the first telescopic cylinder 9 is fixedly connected to the outside of the first bag-holding clamping frame 5. The bag-holding frame 1 is provided with a fixed slide groove 10 on the outside. A fixed slider 11 is slidably connected inside the fixed slide groove 10. A movable frame 12 is fixedly installed on the outside of the fixed slider 11.

[0030] The second telescopic cylinder 13 is fixedly installed on the outside of the movable frame 12 for telescopic movement. A linkage plate 14 is fixedly installed at the front end of the second telescopic cylinder 13. A suction cavity 15 is fixedly installed on the outside of the linkage plate 14. Suction ports 16 are fixedly installed on the outside of the suction cavity 15. Fixed bolts 17 are threaded through the top of the movable frame 12. A connecting frame 18 is threaded to the bottom end of the fixed bolts 17. A bottom cover plate 19 is fixedly installed at the bottom of the connecting frame 18. The upper half of the bag opening of the packaging bag, which is sleeved on the output pipe 3, is clamped by the annular clamping clamp 7 outside the output pipe 3. Then, the suction cavity 15 also fits against the lower half of the bag opening. The output pipe 3 also clamps the packaging bag. Finally, the bottom cover plate 19, which rises together, provides bottom support for the packaging bag. This gives the bag support mechanism of the quantitative packaging scale the ability to double clamp and stabilize.

[0031] like Figure 1 , Figure 2 and Figure 3 As shown, the movable frame 12 is slidably connected to the bag support frame 1, and the fixed slide groove 10 is used in conjunction with the fixed slider 11. The movable frame 12 is used to drive the suction support cavity 15 and the bottom cover plate 19 to slide up and down, thereby completing the bag support. The number of suction ports 16 is set to multiple, and the multiple suction ports 16 are evenly distributed on the suction support cavity 15. The negative pressure generated by the suction ports 16 sucks the outer sides of the packaging bag, and then the second telescopic cylinder 13 extends and retracts outward, thereby causing the suction support cavity 15 to open the packaging bag.

[0032] like Figure 1 , Figure 4 and Figure 5As shown, a vacuum pump 20 is fixedly installed at the bottom of the movable frame 12. An air extraction pipe 21 is fixedly installed on the outside of the vacuum pump 20. The other end of the air extraction pipe 21 is fixedly connected to the outside of the suction support cavity 15. The vacuum pump 20 is used to connect to the suction support cavity 15 and extract air to create negative pressure at the suction port 16 to suction the edges of the packaging bag. An external plate 22 is fixedly installed on the outside of the bag support frame 1. A servo motor 23 is fixedly installed on the top of the external plate 22. A threaded screw 24 is fixedly installed at the output end of the servo motor 23. The threaded screw 24 rotates with a threaded sleeve 25, thereby driving the movable frame 12 to slide up and down, which can meet the bag support operation for packaging bags of different heights and sizes. The threaded sleeve 25 is rotatably connected to the outside of the threaded screw 24. The outside of the threaded sleeve 25 is fixedly connected to the outside of the movable frame 12. The overall structure of the threaded screw 24 is simple and easy to operate. If a fault occurs, it is convenient for maintenance personnel to maintain it in time.

[0033] The working principle of this utility model is as follows: First, connect the external power supply. Connect the input pipe 2 of the bag-supporting mechanism of the quantitative packaging scale to the output end at the bottom of the quantitative packaging scale, allowing the quantitatively packaged material to enter the bag-supporting frame 1 through the input pipe 2. Then, take out the packaging bag and place it between the two suction chambers 15. Next, turn on the switch of the vacuum pump 20. The vacuum pump 20 is connected to the suction chamber 15, drawing air to create a negative pressure at the suction port 16, which sucks the edges of the packaging bag. Then, the negative pressure generated by the suction port 16 sucks the outer sides of the packaging bag. Finally, open the second telescopic cylinder 13. The first telescopic cylinder 9 extends and retracts, causing the second telescopic cylinder 13 to extend and retract outward, thus pulling open the packaging bag through the suction chamber 15. Then, the servo motor 23 is switched on, causing the threaded screw 24 and threaded sleeve 25 to rotate, thereby driving the moving frame 12 to slide up and down. Driven by the moving frame 12, the packaging bag is positioned outside the output pipe 3. Then, the extension and retraction of the first telescopic cylinder 9 causes the first bag clamping frame 5 and the second bag clamping frame 8 to rotate on the fixed frame 4 and move closer together. Through the annular clamping hoop 7 outside the output pipe 3, the upper half of the packaging bag opening on the output pipe 3 is clamped. Partial clamping is performed, followed by the suction cavity 15 fitting against the lower half of the bag opening. The output pipe 3 also clamps the bag against the pressure. The bottom support plate 19, which rises along with the bag, provides bottom support. This gives the bag-supporting mechanism of the quantitative packaging scale a double-clamping and stable fixing capability. The annular clamping clamp 7 clamps the upper half of the bag opening outside the output pipe 3, while simultaneously working with the suction cavity 15 to fit the lower half, forming a double-clamping structure. This enhances the sealing of the bag opening, preventing material leakage during filling. Furthermore, the bottom support plate 19 provides bottom support as the bag rises. The support structure prevents the bag from sagging or deforming during filling. This structure reduces stress concentration at the bottom of the bag, lowering the risk of breakage. This allows the material entering the bag support frame 1 to enter the packaging bag normally. After completing the installation and use of the bag support mechanism for the quantitative packaging scale according to the above operations, turn off the switches of the first telescopic cylinder 9, the second telescopic cylinder 13, the vacuum pump 20, and the servo motor 23. If not used for a long time, simply disconnect the external power supply. This completes the usage process of the bag support mechanism for the quantitative packaging scale.

[0034] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A bag-supporting mechanism for a quantitative packaging scale, characterized in that: include Bag support frame (1), the main body used to support the packaging bags; An input pipe (2) is fixedly installed above the bag support frame (1) for connecting with a quantitative packaging scale. An output pipe (3) is fixedly installed at the bottom of the bag support frame (1). A fixed frame (4) is fixedly installed at the bottom of the bag support frame (1). A first bag support clamping frame (5) is rotatably connected to the outside of the fixed frame (4). A connecting rod (6) is fixedly installed at the bottom of the first bag support clamping frame (5). A ring clamping hoop (7) is fixedly installed on the outside of the connecting rod (6). The second bag clamping frame (8) is rotatably connected to the other side of the fixed frame (4) for cooperating with the first bag clamping frame (5). The second bag clamping frame (8) is fixedly installed with a first telescopic cylinder (9). The front end of the first telescopic cylinder (9) is fixedly connected to the outside of the first bag clamping frame (5). The bag clamping frame (1) is provided with a fixed slide groove (10) on the outside. The fixed slide groove (10) is slidably connected with a fixed slider (11). The fixed slider (11) is fixedly installed with a movable frame (12) on the outside. The second telescopic cylinder (13) is fixedly installed on the outside of the movable frame (12) for telescopic movement. A linkage plate (14) is fixedly installed at the front end of the second telescopic cylinder (13). A suction cavity (15) is fixedly installed on the outside of the linkage plate (14). A suction port (16) is fixedly installed on the outside of the suction cavity (15). A fixing bolt (17) is threaded through the top of the movable frame (12). A connecting frame (18) is threaded to the bottom end of the fixing bolt (17). A bottom cover plate (19) is fixedly installed at the bottom of the connecting frame (18).

2. The bag-supporting mechanism for a quantitative packaging scale according to claim 1, characterized in that: The movable frame (12) is slidably connected to the bag support frame (1), and the fixed slide groove (10) is used in conjunction with the fixed slider (11).

3. The bag-supporting mechanism for a quantitative packaging scale according to claim 1, characterized in that: The number of suction ports (16) is set to multiple, and the multiple suction ports (16) are distributed at equal intervals on the suction cavity (15).

4. The bag-supporting mechanism for a quantitative packaging scale according to claim 1, characterized in that: A vacuum pump (20) is fixedly installed at the bottom of the mobile frame (12), and an air extraction pipe (21) is fixedly installed on the outside of the vacuum pump (20). The other end of the air extraction pipe (21) is fixedly connected to the outside of the suction cavity (15).

5. The bag-supporting mechanism for a quantitative packaging scale according to claim 1, characterized in that: An external plate (22) is fixedly installed on the outside of the bag support frame (1), and a servo motor (23) is fixedly installed on the top of the external plate (22). A threaded screw (24) is fixedly installed at the output end of the servo motor (23).

6. The bag-supporting mechanism for a quantitative packaging scale according to claim 5, characterized in that: The threaded screw (24) is rotatably connected to a threaded sleeve (25), and the outside of the threaded sleeve (25) is fixedly connected to the outside of the movable frame (12).

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