Bag opening mechanism

Abstract

This invention relates to the field of packaging processing technology and provides a bag opening mechanism, including a frame; an opening actuator mounted on the frame, comprising: a bidirectional ball screw and a first motor driving its rotation; a first mounting frame mounted on the bidirectional ball screw; a lateral positioning assembly comprising side arms symmetrically fixed to the frame and a unidirectional ball screw mounted thereon; a second mounting frame mounted on the unidirectional ball screw; and an opening assembly comprising cylinders respectively fixed to the first and second mounting frames, and a support plate fixed to the output end of the cylinders. The bag opening mechanism provided by this solution, through the cooperation of the opening actuator, the lateral positioning assembly, and the opening assembly, significantly reduces the labor intensity of personnel; the mechanical structure automatically completes the bag opening action, which is more stable than manual operation, reduces efficiency fluctuations caused by human fatigue, and improves the overall efficiency of packaging operations.

Description

Technical Field

[0001] This invention belongs to the field of packaging processing technology, and in particular relates to a bag opening mechanism. Background Technology

[0002] In the field of product packaging production, polyethylene packaging bags, as one of many types of packaging bags, are used for packaging products.

[0003] Currently, when packaging products in bags, workers need to manually open the bags and put the products inside. Because manual bag opening and packaging involves high labor intensity and low automation, it cannot meet the requirements of automated production lines. Summary of the Invention

[0004] This invention provides a bag-opening mechanism, which aims to solve the problems of low efficiency and high labor intensity of manual bag opening and packaging of products as mentioned in the background art.

[0005] To solve the above problems, the present invention provides a bag opening mechanism, comprising: a frame; an opening actuator mounted on the frame, comprising: a bidirectional ball screw and a first motor driving its rotation; a first mounting frame mounted on the bidirectional ball screw; a lateral positioning assembly comprising side arms symmetrically fixed on the frame and a unidirectional ball screw mounted thereon; a second mounting frame mounted on the unidirectional ball screw; an opening assembly comprising cylinders respectively fixed on the first and second mounting frames, and a support plate fixed to the output end of the cylinders; and a bag carrying platform disposed below the opening actuator.

[0006] Preferably, the bag carrying platform includes: a connecting plate fixed on the side arm, with a base plate fixedly installed at the bottom of the connecting plate; a carrying plate disposed on the base plate and having an adjustable tilt angle; and an electronic scale plate disposed on the carrying plate for weighing the packaging bags.

[0007] Preferably, the lateral positioning assembly further includes: a second motor fixed on the side arm; pulleys respectively fixed on the output shaft of the second motor and the one-way ball screw; and a transmission belt sleeved on the pulleys.

[0008] Preferably, the frame is provided with a material guiding mechanism for guiding the material to be packaged into the packaging bag. The material guiding mechanism includes: a material guiding hopper fixed above the frame for receiving the material; a material guiding pipe fixedly connected to the bottom of the material guiding hopper; and an auger rotatably installed in the material guiding pipe via bearings.

[0009] Preferably, the material guiding mechanism further includes a driving mechanism, which includes: a third motor fixed on the second mounting bracket; a first spline rod fixed on the output shaft of the third motor via a coupling; a spline tube sleeved on the first spline rod; and first bevel teeth that are fixed to the spline tube and the auger respectively and mesh with each other.

[0010] Preferably, an mounting block is fixedly installed on the base plate, and a connecting block is fixed on the mounting block by a pin, the top end of the connecting block being fixedly connected to the bottom of the support plate.

[0011] Preferably, a limiting plate for limiting the position of the packaging bag is provided above the electronic scale plate, and the limiting plate is arc-shaped.

[0012] Preferably, a first mounting frame and a second mounting frame are provided between the material guiding mechanism and the bag carrying platform. The bottom of the first mounting frame is fixedly connected to the base plate, and the second mounting frame is fixed on the first mounting frame to fix the material guiding hopper.

[0013] Preferably, a connecting frame is fixedly installed on the frame, and one end of the connecting frame is fixedly connected to the first mounting frame.

[0014] Preferably, the first mounting bracket is provided with a pushing mechanism for controlling the movement of the limiting plate.

[0015] Compared with related technologies, the bag opening mechanism provided by the present invention has the following advantages: Compared with existing technologies, the bag opening mechanism provided in this solution replaces manual bag opening operations and reduces labor intensity through the cooperation of the bag opening execution mechanism, the lateral positioning component and the opening component; it realizes automatic feeding with the help of the material guiding mechanism and the drive mechanism, reduces manual intervention and improves the filling efficiency; the bag carrying platform stably supports the packaging bag, the electronic scale makes it easy to grasp the filling amount, and the adjustable angle of the carrying plate makes it easy to pick up the bag. Attached Figure Description

[0016] Figure 1 This is a side view of a bag opening mechanism provided by the present invention. Figure 2 This is a side sectional view of a bag-opening mechanism provided by the present invention. Figure 3 for Figure 2 An enlarged structural diagram of part A shown in the figure; Figure 4 for Figure 2 An enlarged structural diagram of part B shown in the figure; Figure 5 for Figure 2An enlarged structural diagram of section C shown in the figure; Figure 6 for Figure 2 An enlarged structural diagram of part D shown in the figure; Figure 7 This is a top view of the structure of the spreading mechanism in this invention; Figure 8 This is a three-dimensional structural diagram of the spreading mechanism in this invention; Figure 9 This is a schematic diagram of the structure of the base plate, connecting plate and assembly block in this invention; Figure 10 This is a schematic diagram of the limiting plate structure in this invention.

[0017] Reference numerals: 1. Frame; 2. Bidirectional ball screw; 3. First assembly frame; 4. Side arm; 5. Unidirectional ball screw; 6. Second assembly frame; 7. Cylinder; 8. Support plate; 9. First motor; 10. Second motor; 11. Pulley; 12. Drive belt; 13. Connecting plate; 14. Base plate; 15. Bearing plate; 16. Electronic scale plate; 17. First mounting frame; 18. Second mounting frame; 19. Guide hopper; 20. Guide pipe; 21. Screw; 22. Third motor; 23. Mounting block; 24. Connecting block; 25. Slide plate; 26. 27. Slot plate; 28. Electric telescopic rod; 29. ​​Assembly plate; 30. First spline rod; 31. Spline tube; 32. First bevel gear; 33. First screw; 34. Second spline rod; 35. Limiting plate; 36. Second screw; 37. Threaded tube; 38. Guide rod; 39. Guide block; 40. Gear; 41. Tooth plate; 42. Connecting frame; 43. Second bevel gear; 44. Bag opening actuator; 45. Lateral positioning assembly; 46. Spreading assembly; 47. Bag body carrying platform; 48. Material guiding mechanism; 49. Drive mechanism; 40. Pushing mechanism. Detailed Implementation

[0018] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0019] This invention provides a bag-opening mechanism, such as... Figure 1-10As shown, the bag opening mechanism includes: a frame 1; an opening execution mechanism 43, mounted on the frame 1, comprising: a bidirectional ball screw 2 and a first motor 9 driving its rotation; a first mounting frame 3 mounted on the bidirectional ball screw 2; a lateral positioning assembly 44, comprising a side arm 4 symmetrically fixed on the frame 1 and a unidirectional ball screw 5 mounted thereon; a second mounting frame 6 mounted on the unidirectional ball screw 5; an opening assembly 45, comprising a cylinder 7 respectively fixed on the first mounting frame 3 and the second mounting frame 6, and a support plate 8 fixed to the output end of the cylinder 7; and a bag carrying platform 46, disposed below the opening execution mechanism 43.

[0020] In this embodiment, the bag opening mechanism is used as follows: First, the first motor 9 is started. The output of the first motor 9 is connected to the bidirectional ball screw 2 via a coupling, driving the bidirectional ball screw 2 to rotate, which in turn moves the first mounting bracket 3 mounted on the bidirectional ball screw 2. Simultaneously, the unidirectional ball screw 5 on the side arm 4 of the lateral positioning component 44 rotates under the drive of the second motor 10, moving the second mounting bracket 6 mounted on the unidirectional ball screw 5. Through the cooperation of both, the mechanism is adjusted to a position suitable for the packaging bag to be packaged. Then, the cylinder 7 of the opening component 45 is activated. The output end of the cylinder 7 drives the support plate 8 to extend, opening the packaging bag from the corresponding position, thus completing the bag opening operation. The bag-supporting platform 46 supports the opened packaging bag. During the subsequent filling process, the bag-supporting platform 46 stably holds the packaging bag, and the opening component 45 continuously keeps the bag opening open to prevent the filling process from being affected by the bag opening closing. At the same time, if a limit plate 34 is provided, it can further prevent the packaging bag from tipping over during filling, ensuring that the filling process is carried out in an orderly manner. The combination of the bag opening actuator 43, the lateral positioning component 44, and the spreading component 45 replaces the manual operation of opening the packaging bag by hand, greatly reducing the labor intensity of personnel; the mechanical structure automatically completes the bag opening action, which is more stable than manual operation, reduces efficiency fluctuations caused by human fatigue, and improves the overall efficiency of packaging operations; the whole mechanism can be connected with the automated production line to meet the requirements of automated production and solve the problem that manual bag opening is difficult to integrate into the automated process.

[0021] In a further preferred embodiment of the present invention, the bag carrying platform 46 includes: a connecting plate 13 fixed on the side arm 4, and a base plate 14 fixedly installed at the bottom of the connecting plate 13; a carrying plate 15 disposed on the base plate 14 and having an adjustable tilt angle; and an electronic scale plate 16 disposed on the carrying plate 15 for weighing the packaging bag.

[0022] In this embodiment, the base plate 14 is fixed to the side arm 4 by the connecting plate 13, the bearing plate 15 is placed on the base plate 14, and the packaging bag is placed on the electronic scale plate 16. The electronic scale plate 16 integrates a weighing module, which can display the weight of the product in the packaging bag in real time, making it convenient for operators to monitor the loading status; The tilt angle of the support plate 15 can be adjusted. When it is necessary to remove the full packaging bag, the tilt of the support plate 15 can be adjusted. The tilting force can make it easier to remove the bag without having to lift or drag it. The connecting plate 13 and the base plate 14 provide stable support for the entire load-bearing part. The electronic scale plate 16 with integrated weighing module provides a direct reference for the loading amount. The adjustable angle of the load-bearing plate 15 makes bag removal more convenient, thus improving the overall ease of use and practicality.

[0023] In a further preferred embodiment of the present invention, the lateral positioning component 44 further includes: a second motor 10 fixed on the side arm 4; pulleys 11 respectively fixed on the output shaft of the second motor 10 and the one-way ball screw 5; and a transmission belt 12 sleeved on the pulleys 11.

[0024] In this embodiment, when the second motor 10 starts, its output shaft drives its own pulley 11 to rotate. Through the linkage of the transmission belt 12, the pulley 11 on the one-way ball screw 5 rotates accordingly, thereby driving the one-way ball screw 5 to operate and realize the movement of the second assembly frame 6. This transmission method allows the second assembly frame 6 and its components such as the cylinder 7 and support plate 8 to move to the appropriate position as needed, better cooperate with the bag opening action, and adapt to packaging bags of different sizes. The second motor 10 provides stable power, and the pulley 11 and drive belt 12 transmit power smoothly, making the lateral positioning process more automated.

[0025] In a further preferred embodiment of the present invention, a material guiding mechanism 47 is provided on the frame 1 for guiding the material to be packaged into the packaging bag. The material guiding mechanism 47 includes: a material guiding hopper 19 fixed above the frame 1 for receiving the material; a material guiding pipe 20 fixedly connected to the bottom of the material guiding hopper 19; and an auger 21 rotatably installed in the material guiding pipe 20 via a bearing.

[0026] In this embodiment, when the material guiding mechanism 47 is in use, the material to be packaged is first placed into the material guiding hopper 19, and the material enters the material guiding pipe 20 which is fixedly connected to its bottom from the material guiding hopper 19. The auger 21 in the material guiding pipe 20 rotates through the bearing and gradually conveys the material into the packaging bag below. The rotation of the auger 21 allows the material to move in an orderly manner within the guide pipe 20, avoiding blockages and ensuring that the material can smoothly enter the packaging bag, reducing the possibility of spillage. The guide hopper 19 facilitates material collection, the guide pipe 20 guides the material's direction, and the auger 21 assists in material conveying. The combination of these three elements makes the material filling process smoother, reduces the hassle of manual filling, and improves the efficiency of material loading into the packaging bag.

[0027] In a further preferred embodiment of the present invention, the material guiding mechanism 47 further includes a driving mechanism 48, the driving mechanism 48 including: a third motor 22 fixed on the second mounting bracket 18; a first spline rod 29 fixed on the output shaft of the third motor 22 by a coupling; a spline tube 30 sleeved on the first spline rod 29; and first bevel teeth 31 fixed on the spline tube 30 and the auger 21 respectively and meshing with each other.

[0028] In this embodiment, when the drive mechanism 48 of the material guiding mechanism 47 is working, the third motor 22 starts, and its output shaft drives the first spline rod 29 to rotate through the coupling. The rotation of the first spline rod 29 drives the spline tube 30 sleeved on it to rotate. The rotation of the spline tube 30 causes the first bevel tooth 31 fixed on it to rotate. Since the two first bevel teeth 31 mesh with each other, they drive the auger 21 to rotate. The combination of the spline rod 29 and the spline tube 30 allows for a certain amount of axial movement while transmitting power, adapting to different transmission requirements; the meshing of the first bevel tooth 31 changes the direction of power transmission, allowing the power of the third motor 22 to be smoothly transmitted to the auger 21.

[0029] In a further preferred embodiment of the present invention, an mounting block 23 is fixedly mounted on the base plate 14, and a connecting block 24 is fixedly mounted on the mounting block 23 by means of a pin. The top end of the connecting block 24 is fixedly connected to the bottom of the support plate 15.

[0030] In this embodiment, the mounting block 23 is fixed on the base plate 14, and the connecting block 24 is fixed on the mounting block 23 by a pin. The top of the connecting block 24 is fixed to the bottom of the support plate 15. When in use, the support plate 15 can rotate around the connection point between the mounting block 23 and the connecting block 24 to adjust the tilt angle.

[0031] In a further preferred embodiment of the present invention, a limiting plate 34 for limiting the position of the packaging bag is provided above the electronic scale plate 16, and the limiting plate 34 is arc-shaped.

[0032] In this embodiment, the limiting plate 34 is located above the electronic scale plate 16 and is arc-shaped. When the packaging bag is placed on the electronic scale plate 16 for loading, the arc-shaped limiting plate 34 can surround the packaging bag from the side and play a blocking role. The curved design fits the shape of the packaging bag better, allowing it to conform more closely to the sides and preventing the bag from shaking or tipping over during filling, thus making the filling process more stable.

[0033] In a further preferred embodiment of the present invention, a first mounting frame 17 and a second mounting frame 18 are provided between the material guiding mechanism 47 and the bag carrying platform 46. The bottom of the first mounting frame 17 is fixedly connected to the base plate 14, and the second mounting frame 18 is fixed on the first mounting frame 17 for fixing the material guiding hopper 19.

[0034] In this embodiment, the bottom of the first mounting frame 17 is fixedly connected to the base plate 14, the second mounting frame 18 is fixed on the first mounting frame 17, and the guide hopper 19 is fixed on the second mounting frame 18, thus connecting the guide mechanism 47 and the bag carrying platform 46. The first mounting bracket 17 provides a stable support base for the second mounting bracket 18, which in turn can firmly fix the guide hopper 19, preventing the guide hopper 19 from shaking when receiving and conveying materials.

[0035] In a further preferred embodiment of the present invention, a connecting frame 41 is fixedly installed on the frame 1, and one end of the connecting frame 41 is fixedly connected to the first mounting frame 17.

[0036] In this embodiment, one end of the connecting frame 41 is fixed to the frame 1, and the other end is fixedly connected to the first mounting frame 17, thus connecting the frame 1 and the first mounting frame 17 together to form an integral structure. The connection of the connecting frame 41 allows the first mounting frame 17 to no longer rely solely on the base plate 14 for support. The stability of the frame 1 is transferred to the first mounting frame 17, making the first mounting frame 17 more stable and less prone to shaking when bearing components such as the material guiding mechanism 47.

[0037] In a further preferred embodiment of the present invention, a pushing mechanism 49 is provided on the first mounting bracket 17 for controlling the movement of the limiting plate 34.

[0038] In this embodiment, the pushing mechanism 49 is mounted on the first mounting frame 17. When needed, it can move the limiting plate 34 and adjust the limiting plate 34 to a suitable position to better limit the packaging bag.

[0039] To further improve the performance of this device, in addition to the above-mentioned solutions, this solution also includes the following embodiments: In another embodiment of the present invention, the pushing mechanism 49 for controlling the movement of the limiting plate 34 includes: a second screw 35 rotatably mounted on the first mounting bracket 17 via a bearing, the second screw 35 having a threaded tube 36 threadedly sleeved on it; one end of the threaded tube 36 being fixedly connected to the limiting plate 34; a guide block 38 fixed on the first mounting bracket 17, a guide rod 37 slidably mounted on the guide block 38, the guide rod 37 being fixedly connected to the threaded tube 36; an electric telescopic rod 27 fixed on the first mounting bracket 17, an assembly plate 28 fixedly mounted on the output rod of the electric telescopic rod 27 for controlling the lifting and lowering of the spline tube 30, the assembly plate 28 having a bearing rotatably sleeved on the spline tube 30; a gear 39 fixed on the second screw 35; and a toothed plate 40 fixed on the assembly plate 28 and meshing with the gear 39.

[0040] In this embodiment, when the pushing mechanism 49 is working, the electric telescopic rod 27 drives the assembly plate 28 to rise and fall. The toothed plate 40 on the assembly plate 28 meshes with the gear 39 on the second screw 35, which drives the second screw 35 to rotate, causing the threaded tube 36 to move along the second screw 35, thereby driving the limiting plate 34 to move. At the same time, the guide rod 37 slides on the guide block 38 with the threaded tube 36, playing a guiding role. The cooperation between the second screw 35 and the threaded tube 36 allows the limiting plate 34 to move smoothly, while the guide rod 37 and the guide block 38 ensure accurate movement direction.

[0041] In another embodiment of the present invention, an adjustment mechanism is provided on the base plate 14, the first mounting bracket 17, and the support plate 15 for adjusting the tilt of the support plate 15. The adjustment mechanism includes: a first screw 32 rotatably mounted on the first mounting bracket 17 via a bearing; a groove plate 26 fixed to the bottom of the support plate 15; a sliding plate 25 threaded onto the first screw 32, the bottom end of the sliding plate 25 extending into a guide groove on the base plate 14; the top end of the sliding plate 25 extending into the groove plate 26; and a second spline rod 33 rotatably mounted on the first mounting bracket 17 via a bearing, the bottom end of the second spline rod 33 being fixedly mounted with a second bevel tooth 42 meshing with the first screw 32.

[0042] In this embodiment, when the output rod of the electric telescopic rod 27 retracts, it drives the assembly plate 28 and the spline tube 30 to move downwards. The spline tube 30 and the second spline rod 33 are aligned on a straight line, and the spline tube 30 will fit onto the second spline rod 33. At this time, the two first bevel teeth 31 separate. Then, the third motor 22 is started, and the power is transmitted to the second spline rod 33 via the first spline rod 29 and the spline tube 30. The first screw 32 is rotated by the meshing second bevel teeth 42, and the slide plate 25 moves along the guide groove of the base plate 14. Its top end moves in the inclined groove in the groove plate 26, thereby pushing the bearing plate 15 to tilt. The extension and retraction of the electric telescopic rod 27 enables the connection and switching between the spline tube 30 and the second spline rod 33. When the spline tube 30 is fitted onto the second spline rod 33, the power can be smoothly transmitted to the adjustment mechanism. The separation of the first bevel tooth 31 avoids power interference between the material guiding mechanism 47 and the adjustment mechanism, so that the two actions do not affect each other.

[0043] In summary, compared with related technologies, this solution replaces manual bag opening by cooperating with the bag opening actuator 43, the lateral positioning component 44, and the spreading component 45, thus reducing labor intensity; it achieves automatic feeding with the help of the material guiding mechanism 47 and the drive mechanism 48, reducing manual intervention and improving filling efficiency; the bag carrying platform 46 stably supports the packaging bag, the electronic scale plate 16 makes it easy to control the filling amount, and the adjustable angle of the carrying plate 15 facilitates bag removal.

[0044] It should be noted that the core advantage of this bag opening mechanism, as an integrated automated device, lies in the precise coordination and efficient cooperation between its components. Through the organic combination of mechanical structure and power transmission, it has achieved a complete process innovation from manual bag opening to fully automatic bag opening, filling, and bag removal. As the fundamental support component of the entire mechanism, frame 1 not only bears the weight of core functional modules such as the bag-opening actuator 43 and the lateral positioning component 44, but also is fixedly connected to the first mounting frame 17 via the connecting frame 41, forming a rigid integral structure. This design effectively avoids component displacement caused by vibration during high-speed operation, ensuring the positioning accuracy of each moving component. For example, when the bidirectional ball screw 2 drives the first mounting frame 3 to move under the drive of the first motor 9, the stability of frame 1 can control its displacement error within a very small range, ensuring the precise alignment of the support block 8 with the packaging bag. The bag opening actuator 43 works in conjunction with the lateral positioning component 44. The bidirectional ball screw 2 and the unidirectional ball screw 5 are responsible for horizontal and vertical position adjustment, respectively. They are linked through the independent drives of the first motor 9 and the second motor 10. In actual operation, when the size of the packaging bag changes, the control system can synchronously adjust the output speed of the first motor 9 and the second motor 10 according to preset parameters: if the bag opening diameter increases, the first motor 9 drives the bidirectional ball screw 2 to move the two first assembly frames 3 away from each other. Simultaneously, the second motor 10 drives the unidirectional ball screw 5 to rotate via the pulley 11 and transmission belt 12, raising the second assembly frame 6 to a suitable height, ensuring that the support blocks 8 driven by the four cylinders 7 can be accurately inserted and opened from the four corners of the packaging bag. This bidirectional adjustment mechanism can adapt to packaging bag opening diameters ranging from 10cm to 50cm, covering the needs of most industrial packaging scenarios. The cylinder 7 of the opening assembly 45 adopts a double-acting design. The extension and retraction speed and thrust of its output rod can be adjusted via a valve to flexibly open packaging bags of different materials. For thinner polyethylene packaging bags, cylinder 7 outputs a smaller thrust to avoid tearing the bag opening; while for more resilient woven bags, the thrust can be increased to ensure the bag opening is fully opened. The end of the support block 8 features an arc-shaped transition design with smooth, edgeless edges, allowing for easy insertion into the bag opening while reducing friction damage with the bag body. This detailed design significantly reduces the breakage rate of packaging bags. As a key link connecting material storage and packaging bags, the material guiding mechanism 47 is designed with full consideration of the physical characteristics of different materials. The material guiding hopper 19 adopts a funnel-shaped structure with a polished inner wall, which effectively reduces the adhesion of materials during the falling process. For materials that are prone to moisture and clumping (such as fertilizer granules), a vibration device can be installed on the outside of the material guiding hopper 19 to prevent material accumulation and blockage through high-frequency micro-vibration. The blades of the auger 21 can adopt a variable pitch design, with a larger pitch at the feed end (approximately 100mm) to quickly receive materials, and a gradually decreasing pitch at the discharge end (approximately 50mm) to achieve uniform discharge by compressing the material density. This design is particularly important for powdery materials, as it can effectively avoid the phenomenon of "powder spraying". In terms of material loading control, the electronic weighing plate 16 plays a crucial role. Connected to the control system via a signal line, it provides real-time feedback on the weight of the material inside the packaging bag. When the material approaches the preset weight, the control system reduces the speed of the third motor 22, slowing down the conveying speed of the auger 21, ultimately achieving precise measurement through an instantaneous stop. For example, when packaging 25kg bags of material, when the electronic weighing plate 16 displays 24.5kg, the auger 21's speed drops from 300r / min to 50r / min, stopping immediately upon reaching 25kg, a level of accuracy far exceeding that of manual loading.

[0045] The design of the bag-carrying platform 46 significantly reduces the labor intensity of operators through structural optimization. The carrying plate 15 and the base plate 14 are connected by a pin between the mounting block 23 and the connecting block 24, forming a rotating pair. This, combined with the adjustment mechanism, allows for tilt angle adjustment from 0° to 30°. When the packaging bag is full, the adjustment mechanism activates: the electric telescopic rod 27 retracts, causing the spline tube 30 to be fitted onto the second spline rod 33. The power of the third motor 22 is transmitted to the first screw 32 via the second bevel gear 42, causing the sliding plate 25 to move along the guide groove. Its top slides within the inclined groove of the slot plate 26, thus gradually tilting the carrying plate 15. During this process, the packaging bag will slightly slide towards the bag-removal direction under gravity, allowing the operator to easily remove it with a gentle pull, which is more labor-saving compared to horizontal bag removal. The curved design of the limiting plate 34 matches the outer contour of common packaging bags, providing stable support for the bag from the side without causing material spillage due to excessive compression. The pushing mechanism 49, through the threaded transmission between the second screw 35 and the threaded tube 36, enables the limiting plate 34 to move horizontally within a range of 0-20cm. When the packaging bag is tall, the limiting plate 34 moves forward to increase support points and prevent the bag from tipping over; while for short and wide packaging bags, the limiting plate 34 retracts backward to avoid interference. This adaptive adjustment capability allows it to adapt to various packaging shapes. The cooperation between the guide rod 37 and the guide block 38 ensures the straightness of the movement of the limit plate 34, and the gap is controlled within 0.05mm to avoid jamming or deviation during the movement. The entire mechanism's power transmission system adopts a hybrid mode of "motor + mechanical transmission," ensuring both stable power output and precise control. The first motor 9, the second motor 10, and the third motor 22 are all servo motors, whose speeds can be precisely controlled via pulse signals. Combined with an encoder, closed-loop feedback is achieved, resulting in a positioning accuracy of 0.1mm. For example, the lead of the bidirectional ball screw 2 is 10mm; each rotation of the servo motor moves the first assembly frame 3 by 10mm. Through microstepping control, the minimum movement can reach 0.01mm, ensuring the accuracy of the bag opening position. The belt drive system consisting of pulley 11 and transmission belt 12 adopts synchronous belt drive. Its tooth structure avoids slippage, and the transmission efficiency can reach over 98%. The tension of the synchronous belt can be adjusted by adjusting the installation position of the second motor 10 to ensure that a stable transmission ratio is maintained even after long-term use. The control system uses a PLC (Programmable Logic Controller) as its core, in conjunction with a touchscreen for parameter setting and status monitoring. Operators can preset process parameters for different packaging bags via the touchscreen, such as bag opening width, filling weight, and carrier plate tilt angle, and the system will automatically call up the corresponding parameters for production. Simultaneously, the equipment also has an automatic diagnostic function; when a sensor or actuator malfunctions, the touchscreen will immediately display the fault code and troubleshooting suggestions, significantly reducing troubleshooting time. This bag-opening mechanism is highly versatile and can be widely used in packaging production lines across various industries, including food, chemicals, and building materials. In the food industry, for powdered materials such as flour and sugar, a dust cover can be added to the end of the feed pipe 20 to reduce dust emissions. In the chemical industry, to cope with corrosive materials, components such as the feed hopper 19 and feed pipe 20 that come into contact with the materials can be made of 316 stainless steel to improve the equipment's corrosion resistance. The modular design of the mechanism makes it easy to interface with other automated equipment. For example, an automatic bag feeder can be installed in front of the bag opening mechanism to achieve automatic supply of packaging bags; a sealing machine can be connected behind the bag picking position to form a fully automated production line of "bag opening-filling-weighing-sealing". The connecting frame 41 has a reserved standardized interface, which can be expanded with a robot bag picking device as needed to further reduce manual intervention. To adapt to the needs of small-batch, multi-variety production, the changeover and adjustment time of the mechanism has been reduced to less than 5 minutes. Operators only need to replace the support block 8 with one that matches the size of the packaging bag, and call up the corresponding parameters via the touchscreen. The equipment can then automatically complete all adjustments without the need for complex mechanical calibration. This rapid changeover capability allows the equipment to flexibly respond to frequent order changes, significantly improving the flexibility of the production line. The ease of maintenance of the equipment was fully considered during the design phase. Each transmission component, such as the ball screw and pulley, is equipped with a grease nipple. Regularly injecting grease will ensure smooth operation. The air system of cylinder 7 is equipped with a filter, pressure reducing valve, and lubricator, which can effectively remove impurities from the compressed air, regulate the air pressure, and lubricate the inside of the cylinder, thus extending the service life of the pneumatic components. In terms of safety protection, safety light curtains are installed around the equipment. When an operator's hand or body enters the danger zone, the equipment will immediately stop and issue an audible and visual alarm to prevent mechanical injury accidents. Emergency stop buttons are located on the control panel and around the equipment to ensure that the power can be quickly cut off in an emergency. The electrical system adopts a double insulation design, with a grounding resistance of less than 4Ω, which meets national electrical safety standards.

[0046] It should be understood, in the several embodiments provided in this application, that the disclosed apparatus may be implemented in other ways.

[0047] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the scope of protection of the invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on these embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can still combine, add, delete, or otherwise adjust the features of the various embodiments of the present invention according to the circumstances without conflict or creative effort, thereby obtaining different technical solutions that do not fundamentally depart from the concept of the present invention. These technical solutions also fall within the scope of protection of the present invention.

Claims

1. A bag-opening mechanism, characterized in that, include: A frame (1); a bag-opening actuator (43) is mounted on the frame (1) and includes a bidirectional ball screw (2) and a first motor (9) that drives it to rotate. The first mounting bracket (3) is mounted on the bidirectional ball screw (2); The lateral positioning assembly (44) includes a side arm (4) symmetrically fixed on the frame (1) and a one-way ball screw (5) mounted thereon. A second mounting bracket (6) is mounted on the unidirectional ball screw (5); The expansion assembly (45) includes a cylinder (7) fixed on the first assembly frame (3) and the second assembly frame (6) respectively, and a support plate (8) fixed to the output end of the cylinder (7). The bag-carrying platform (46) is located below the bag-opening actuator (43).

2. The bag-opening mechanism as described in claim 1, characterized in that, The bag-carrying platform (46) includes: A connecting plate (13) is fixed on the side arm (4), and a base plate (14) is fixedly installed on the bottom of the connecting plate (13). A support plate (15) is mounted on the base plate (14) and has an adjustable tilt angle. An electronic scale plate (16) for weighing packaging bags is set on a support plate (15).

3. The bag-opening mechanism as described in claim 1, characterized in that, The lateral positioning component (44) further includes: A second motor (10) is fixed on the side arm (4); The pulleys (11) are respectively fixed on the output shaft of the second motor (10) and the one-way ball screw (5). A transmission belt (12) is fitted onto the pulley (11).

4. The bag-opening mechanism as described in claim 2, characterized in that, The frame (1) is provided with a material guiding mechanism (47) for guiding the material to be packaged into the packaging bag. The material guiding mechanism (47) includes: A guide hopper (19) fixed above the frame (1) for receiving materials; A guide pipe (20) is fixedly connected to the bottom of the guide hopper (19); The auger (21) is rotated within the feed tube (20) via a bearing.

5. The bag-opening mechanism as described in claim 4, characterized in that, The material guiding mechanism (47) further includes a driving mechanism (48), which includes: A third motor (22) is fixed on the second mounting bracket (18); The first spline rod (29) is fixed to the output shaft of the third motor (22) by a coupling. A spline tube (30) sleeved on the first spline rod (29); The first bevel teeth (31) are fixed to the spline tube (30) and the auger (21) respectively and mesh with each other.

6. The bag-opening mechanism as described in claim 2, characterized in that, An mounting block (23) is fixedly installed on the base plate (14), and a connecting block (24) is fixed on the mounting block (23) by a pin. The top of the connecting block (24) is fixedly connected to the bottom of the bearing plate (15).

7. The bag-opening mechanism as described in claim 2, characterized in that, Above the electronic scale plate (16) is a limiting plate (34) for limiting the position of the packaging bag, and the limiting plate (34) is arc-shaped.

8. The bag-opening mechanism as described in claim 4, characterized in that, A first mounting frame (17) and a second mounting frame (18) are provided between the material guiding mechanism (47) and the bag carrying platform (46). The bottom of the first mounting frame (17) is fixedly connected to the base plate (14), and the second mounting frame (18) is fixed on the first mounting frame (17) to fix the material guiding hopper (19).

9. The bag-opening mechanism as described in claim 8, characterized in that, A connecting frame (41) is fixedly installed on the frame (1), and one end of the connecting frame (41) is fixedly connected to the first mounting frame (17).

10. The bag-opening mechanism as described in claim 8, characterized in that, The first mounting bracket (17) is provided with a pushing mechanism (49).

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