A weighing device for a packaging machine

Abstract

The utility model relates to packing machinery technical field, concretely relates to a weighing device for packing machinery. Including support frame, the upper fixed connection of support frame has the frame, the inner fixed connection of frame has upper feed cylinder and middle feed cylinder, and upper feed cylinder sets at the top of middle feed cylinder, the lower extreme of upper feed cylinder and middle feed cylinder is provided with limit device, the limit device is used for controlling the material of upper feed cylinder and middle feed cylinder inside unloading, the utility model discloses automatic opening and closing mechanism of clamping plate through the air cylinder drive, cooperation convex block and the locking design of slot, realize the quick positioning of packaging bag and double -fixed, through the cooperation of motor, gear and rack, can accurate control sealing cap to upper feed cylinder, middle feed cylinder's opening and closing sequence and time, realize material stage, according to rhythm and fall, ensure that the unloading amount and opportunity are accurate and correct.

Description

Technical Field

[0001] This utility model relates to the field of packaging machinery technology, and more specifically, to a weighing device for packaging machinery. Background Technology

[0002] Packaging is a necessary condition for products to enter the circulation field, and the main means of packaging is to use packaging machinery. In order to ensure that the weight of packaged products is consistent, it is necessary to use weighing devices for packaging machinery to measure the weight of packaged products, so that their specifications are consistent and meet the requirements of packaging standardization.

[0003] Traditional equipment typically uses a single feed cylinder for direct feeding or a simple gate control method. The single feed cylinder design cannot achieve multi-stage quantitative feeding, resulting in large deviations in material filling accuracy. Some equipment uses mechanical gate control, relying on mechanical linkages for manual opening and closing, which suffers from response delays and low positioning accuracy, failing to achieve precise layered material conveying. Furthermore, many devices use simple mechanical grippers to hold and fix packaging bags, but when dealing with packaging bags of different thicknesses and materials, the gripping force is difficult to control precisely, easily causing damage to the bag or insecure fixation. In addition, traditional gripper structures rely solely on planar contact for fixation; during material filling, when encountering impacts from granular materials, the packaging bag is highly susceptible to displacement. Utility Model Content

[0004] The purpose of this invention is to provide a weighing device for packaging machinery to solve the problems of unstable bag clamping and difficulty in accurately feeding materials.

[0005] To achieve the above objectives, this utility model provides a weighing device for packaging machinery, including a support frame. A frame is fixedly connected to the upper part of the support frame. An upper feed cylinder and a middle feed cylinder are fixedly connected inside the frame, with the upper feed cylinder positioned above the middle feed cylinder. Limiting devices are provided at the lower ends of the upper and middle feed cylinders. The limiting devices are used to control the material feeding inside the upper and middle feed cylinders. The limiting device includes a motor fixedly connected to one side of the frame. A gear is fixedly connected to the output end of the motor. A rack is rotatably connected to one side of the frame. The rack meshes with the gear for transmission. A sealing cap is fixedly connected to the end of the rack away from the gear, and the sealing cap is positioned below the middle feed cylinder. A clamping device is provided inside the support frame for clamping and fixing the opening of the packaging bag.

[0006] As a further improvement to this technical solution, a lower feed cylinder is fixedly connected to the upper inner top wall of the support frame, and a through hole adapted to the lower feed cylinder is opened on the upper side of the support frame. The lower end of the lower feed cylinder is set as a circular discharge cylinder, and a limiting sleeve is fixedly connected to the upper inner side of the support frame, and the limiting sleeve is located directly below the lower feed cylinder.

[0007] As a further improvement to this technical solution, the limiting device includes a second rack disposed on one side of the frame. The second rack is meshed with a gear, and a sealing cover is fixedly connected to the end of the second rack away from the gear. The sealing cover is disposed at the lower end of the upper feed cylinder.

[0008] Through the coordination of motors, gears, and racks, the opening and closing sequence and timing of the sealing cover on the upper and middle feed cylinders can be precisely controlled, enabling materials to fall in stages and rhythmically, ensuring accurate material discharge quantity and timing.

[0009] As a further improvement to this technical solution, the diameters of the two sealing caps are respectively larger than the diameters of the discharge ports at the lower ends of the upper and middle feed cylinders, and a cone is fixedly connected to the upper end of each of the two sealing caps.

[0010] As a further improvement to this technical solution, the clamping device includes side plates fixedly connected to both sides of the lower feed cylinder. Two fixed rods are fixedly connected to the side of the side plates away from the lower feed cylinder. Movable rods are rotatably connected to the two fixed rods. A cylinder is provided on the adjacent side of the two movable rods, and the two ends of the cylinder are rotatably connected to one end of the movable rod, respectively.

[0011] As a further improvement to this technical solution, a cylindrical rod is fixedly connected between the two movable rods, and two push rods are rotatably connected to the two cylindrical rods. A fixed sleeve is fixedly connected to the end of the two push rods away from the cylindrical rod.

[0012] The automatic opening and closing mechanism of the clamping plate is driven by a cylinder, and the locking design of the protrusion and the slot enables the packaging bag to be quickly positioned and double-fixed, effectively resisting external forces such as material impact and vibration during the packaging process, and preventing the bag from sliding off.

[0013] As a further improvement to this technical solution, a clamping plate is fixedly connected inside the fixed sleeve, and a protrusion is fixedly connected to the inner wall of the clamping plate. A slot that matches the protrusion is opened at the lower end of the lower feed cylinder.

[0014] Compared with existing technologies, the advantages of this utility model are as follows: The automatic opening and closing mechanism of the clamping plate driven by a cylinder, combined with the locking design of protrusions and slots, enables rapid positioning and double fixing of the packaging bag. This effectively resists external forces such as material impact and vibration during packaging, preventing the bag from sliding and falling off, and effectively avoiding packaging errors caused by positional deviation. It significantly improves packaging efficiency and finished product qualification rate. Through the cooperation of motors, gears, and racks, the opening and closing sequence and timing of the sealing cap on the upper and middle feeding cylinders can be precisely controlled, enabling materials to fall in stages and rhythmically, ensuring accurate material feeding quantity and timing. Compared with traditional packaging equipment, it significantly reduces packaging defects caused by excessive or insufficient material, greatly improves packaging accuracy and product consistency, and adapts to diverse packaging needs. Attached Figure Description

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

[0016] Figure 2 This is a cross-sectional schematic diagram of the support frame of the utility model;

[0017] Figure 3 This is a schematic diagram of the lower feed cylinder of the utility model;

[0018] Figure 4 This is a schematic diagram of the structure of the utility model clamping device;

[0019] Figure 5 This is a schematic diagram of the structure of the utility model limiting device.

[0020] The meanings of the labels in the diagram are as follows:

[0021] 1. Support frame; 11. Limiting sleeve; 12. Frame; 13. Upper feed cylinder; 14. Middle feed cylinder; 15. Lower feed cylinder;

[0022] 2. Limiting device; 21. Gear; 22. Rack No. 1; 24. Sealing cover; 25. Cone; 26. Rack No. 2; 28. Motor;

[0023] 3. Clamping device; 31. Side plate; 32. Fixed rod; 33. Movable rod; 34. Cylinder; 35. Cylindrical rod; 36. Push rod; 37. Clamping plate; 38. Protrusion; 39. Fixed sleeve. Detailed Implementation

[0024] 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.

[0025] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", 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 are not intended to indicate or imply that the device or component 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.

[0026] Example 1

[0027] Please see Figures 1-5 As shown, this embodiment provides a weighing device for packaging machinery, including a support frame 1. A frame 12 is fixedly connected to the upper part of the support frame 1. An upper feed cylinder 13 and a middle feed cylinder 14 are fixedly connected inside the frame 12, with the upper feed cylinder 13 positioned above the middle feed cylinder 14. A lower feed cylinder 15 is fixedly connected to the upper inner top wall of the support frame 1. A through hole adapted to the lower feed cylinder 15 is provided on the upper side of the support frame 1. The lower end of the lower feed cylinder 15 is configured as a circular discharge cylinder. A limiting sleeve 11 is fixedly connected to the upper inner side of the support frame 1, and the limiting sleeve 11 is positioned directly below the lower feed cylinder 15.

[0028] In the initial state, the lower end of the upper feed cylinder 13 is in a sealed state, the lower end of the middle feed cylinder 14 is in an open state, and the two fixing sleeves 39 are expanded outward and in an open state, which facilitates the subsequent clamping and fixing of the bag opening.

[0029] Please see Figures 1-4As shown, the support frame 1 is internally equipped with a clamping device 3, which is used to clamp and fix the opening of the packaging bag. The clamping device 3 includes side plates 31 fixedly connected to both sides of the lower feed cylinder 15. Two fixed rods 32 are fixedly connected to the side of the side plate 31 away from the lower feed cylinder 15. Movable rods 33 are rotatably connected to the two fixed rods 32. A cylinder 34 is provided on the adjacent side of the two movable rods 33, and the two ends of the cylinder 34 are rotatably connected to one end of the movable rod 33 respectively. A cylindrical rod 35 is fixedly connected between the two movable rods 33. Two push rods 36 are rotatably connected to the two cylindrical rods 35. A fixed sleeve 39 is fixedly connected to the end of the two push rods 36 away from the cylindrical rod 35. Before use, the cylinder 34 is driven to work. The operation of the cylinder 34 drives the two movable rods 33 to rotate to both sides. 4. Rotation drives the cylindrical rod 35 to rotate. The cylindrical rod 35 drives the fixed sleeve 39 to rotate via the push rod 36. The fixed sleeve 39 drives the clamping plate 37 away from the outer wall of the lower end of the lower feed cylinder 15. Then, the packaging bag is placed inside the limiting sleeve 11, and the bag opening is fitted onto the lower end of the lower feed cylinder 15. Then, the cylinder 34 is closed. The cylinder 34 drives the two movable rods 33 to rotate downward. The cylinder 34 drives the cylindrical rod 35 to rotate. The cylindrical rod 35 drives the fixed sleeve 39 to move closer to the lower end of the lower feed cylinder 15 via the push rod 36, so that the inner wall of the clamping plate 37 abuts against the outer wall of the lower end of the lower feed cylinder 15, clamping and fixing the packaging bag. This realizes the rapid and automatic opening and closing of the clamping plate 37, keeping the packaging bag in a fixed position during the packaging process, avoiding packaging errors caused by positional deviation, and improving packaging efficiency.

[0030] Please see Figure 2 and Figure 4 As shown, a clamping plate 37 is fixedly connected inside the fixed sleeve 39, and a protrusion 38 is fixedly connected to the inner wall of the clamping plate 37. The lower end of the lower feed cylinder 15 is provided with a slot that matches the protrusion 38. Since the clamping plate 37 is provided with the protrusion 38, the protrusion 38 pushes the packaging bag into the slot, clamping the packaging bag in the slot. This effectively prevents the packaging bag from sliding or falling off due to external forces such as material impact and machine vibration during the packaging process, making the packaging bag more secure and reliable, and further improving the accuracy and stability of the packaging.

[0031] Please see Figure 3 and Figure 5As shown, a limiting device 2 is provided at the lower end of the upper feed cylinder 13 and the middle feed cylinder 14. The limiting device 2 is used to control the material discharge inside the upper feed cylinder 13 and the middle feed cylinder 14. The limiting device 2 includes a motor 28 fixedly connected to one side of the frame 12. A gear 21 is fixedly connected to the output end of the motor 28. A first rack 22 is rotatably connected to one side of the frame 12. The first rack 22 meshes with the gear 21. A sealing cover 24 is fixedly connected to the end of the first rack 22 away from the gear 21, and the sealing cover 24 is located below the middle feed cylinder 14. The limiting device 2 also includes a second rack 26 located on one side of the frame 12. The second rack 26 meshes with the gear 21. The second rack 26 is located at the lower end of the middle feed cylinder 14 away from the gear 21. A sealing cap 24 is fixedly connected to one end of the gear 21. The sealing cap 24 is located at the lower end of the upper feed cylinder 13. After the packaging bag is clamped and fixed, the material is poured into the interior of the upper feed cylinder 13. The sealing cap 24 seals the lower end of the upper feed cylinder 13. Then, the motor 28 is started to drive the gear 21 to rotate. The rotation of the gear 21 drives the first rack 22 and the second rack 26 to move in opposite directions. At this time, the gear 21 drives the second rack 26 to move downward. The second rack 26 drives the sealing cap 24 to open the lower end of the upper feed cylinder 13, while the first rack 22 moves upward to drive the sealing cap 24 to seal the lower end of the middle feed cylinder 14, so that the material in the upper feed cylinder 13 falls into the middle feed cylinder 14.

[0032] Restarting motor 28 drives gear 21 to rotate in the opposite direction. Gear 21 drives rack 26 to move upward. Rack 26 drives sealing cover 24 to block the lower end of upper feed cylinder 13. Gear 21 drives rack 22 to move downward. Rack 22 drives sealing cover 24 to move downward, opening the lower end of middle feed cylinder 14. This allows the material in middle feed cylinder 14 to fall into lower feed cylinder 15. The material in lower feed cylinder 15 falls into the packaging bag. This process accurately follows the set program and rhythm, allowing material to fall from upper feed cylinder 13 into middle feed cylinder 14 and finally into the packaging bag. This ensures precise material feeding quantity and timing, improving packaging accuracy and consistency, and avoiding packaging defects caused by too much or too little material.

[0033] Please see Figure 5 As shown, the diameters of the two sealing covers 24 are larger than the diameters of the discharge ports at the lower ends of the upper feed cylinder 13 and the middle feed cylinder 14, respectively. A cone 25 is fixedly connected to the upper end of each of the two sealing covers 24. By providing cones 25 on both sealing covers 24, the material inside the upper feed cylinder 13 and the middle feed cylinder 14 can fall more easily, guiding the material to fall more smoothly and preventing it from falling onto the sealing covers 24, thus improving the efficiency of material falling.

[0034] In this embodiment, the weighing device for packaging machinery, when in use, drives the cylinder 34 to rotate the movable rod 33 to both sides, which in turn drives the cylindrical rod 35, push rod 36, fixed sleeve 39 and clamping plate 37 to rotate, so that the clamping plate 37 moves away from the lower outer wall of the lower feed cylinder 15. The packaging bag is placed in the limiting sleeve 11, and after the bag opening is fitted onto the lower end of the lower feed cylinder 15, the cylinder 34 is closed, which drives the components to move in the opposite direction, so that the inner wall of the clamping plate 37 abuts against the lower outer wall of the lower feed cylinder 15, completing the initial fixation. At the same time, the protrusion 38 inside the clamping plate 37 is engaged with the slot at the lower end of the lower feed cylinder 15, further squeezing the packaging bag, enhancing the fixation effect, and preventing the packaging bag from sliding off due to external force during the packaging process.

[0035] After the packaging bag is secured, the material is poured into the upper feed cylinder 13, and the sealing cap 24 seals its lower end. The motor 28 is started, and the motor 28 drives the gear 21 to rotate. The gear 21 meshes with the first rack 22 and the second rack 26, causing the second rack 26 to move the sealing cap 24 down to open the lower end of the upper feed cylinder 13. At the same time, the first rack 22 moves the sealing cap 24 up to seal the lower end of the middle feed cylinder 14, and the material in the upper feed cylinder 13 falls into the middle feed cylinder 14. The motor 28 is started again, causing the gear 21 to rotate in the opposite direction. The second rack 26 moves the sealing cap 24 up to seal the lower end of the upper feed cylinder 13, and the first rack 22 moves the sealing cap 24 down to open the lower end of the middle feed cylinder 14, and the material in the middle feed cylinder 14 falls into the lower feed cylinder 15, finally entering the packaging bag. This process ensures that the material is fed according to the set program and rhythm, guaranteeing packaging accuracy and consistency.

[0036] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A weighing device for packaging machinery, comprising a support frame (1), wherein a frame (12) is fixedly connected above the support frame (1), and an upper feed cylinder (13) and a middle feed cylinder (14) are fixedly connected inside the frame (12), wherein the upper feed cylinder (13) is disposed above the middle feed cylinder (14), characterized in that: The lower ends of the upper feed cylinder (13) and the middle feed cylinder (14) are provided with limiting devices (2). The limiting devices (2) are used to control the material feeding inside the upper feed cylinder (13) and the middle feed cylinder (14). The limiting devices (2) include a motor (28) fixedly connected to one side of the frame (12). The output end of the motor (28) is fixedly connected to a gear (21). A rack (22) is rotatably connected to one side of the frame (12). The rack (22) meshes with the gear (21) for transmission. A sealing cover (24) is fixedly connected to the end of the rack (22) away from the gear (21). The sealing cover (24) is located below the middle feed cylinder (14). A clamping device (3) is provided inside the support frame (1). The clamping device (3) is used to clamp and fix the bag opening of the packaging bag.

2. The weighing device for packaging machinery according to claim 1, characterized in that: The upper inner top wall of the support frame (1) is fixedly connected to the lower feed cylinder (15). The upper side of the support frame (1) is provided with a through hole that matches the lower feed cylinder (15). The lower end of the lower feed cylinder (15) is set as a circular discharge cylinder. The upper inner side of the support frame (1) is fixedly connected to the limiting sleeve (11), and the limiting sleeve (11) is located directly below the lower feed cylinder (15).

3. The weighing device for packaging machinery according to claim 1, characterized in that: The limiting device (2) includes a second rack (26) disposed on one side of the frame (12), the second rack (26) meshing with a gear (21), and a sealing cover (24) fixedly connected to the end of the second rack (26) away from the gear (21), the sealing cover (24) being disposed at the lower end of the upper feed cylinder (13).

4. The weighing device for packaging machinery according to claim 3, characterized in that: The diameters of the two sealing caps (24) are larger than the diameters of the discharge ports at the lower ends of the upper feed cylinder (13) and the middle feed cylinder (14), respectively, and a cone (25) is fixedly connected to the upper end of each of the two sealing caps (24).

5. The weighing device for packaging machinery according to claim 2, characterized in that: The clamping device (3) includes side plates (31) fixedly connected to both sides of the lower feed cylinder (15). Two fixed rods (32) are fixedly connected to the side of the side plate (31) away from the lower feed cylinder (15). Movable rods (33) are rotatably connected to the two fixed rods (32). A cylinder (34) is provided on the adjacent side of the two movable rods (33), and the two ends of the cylinder (34) are rotatably connected to one end of the movable rod (33).

6. The weighing device for packaging machinery according to claim 5, characterized in that: A cylindrical rod (35) is fixedly connected between the two movable rods (33), and two push rods (36) are rotatably connected to the two cylindrical rods (35). A fixed sleeve (39) is fixedly connected to one end of the two push rods (36) away from the cylindrical rod (35).

7. The weighing device for packaging machinery according to claim 6, characterized in that: The fixed sleeve (39) is internally fixedly connected to a clamping plate (37), and the inner wall of the clamping plate (37) is fixedly connected to a protrusion (38). The lower end of the lower feed cylinder (15) is provided with a slot that matches the protrusion (38).

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