Food packaging bag heat-sealing conveying device and heat-sealing equipment and method

Abstract

The invention belongs to the technical field of packaging bag conveying devices, and discloses a food packaging bag heat sealing conveying device and heat sealing equipment and method.The conveying device comprises a main frame, two main beam plates are symmetrically installed on the left outer wall and the right outer wall of the main frame, and a V-shaped side supporting type conveying line and a back frame are installed on the portion, below the main beam plates, of the outer wall of the main frame; first steel bars are fixedly installed on the outer wall of the side, away from the main frame, of the main beam plate, auxiliary beam plates parallel to the main beam plate are arranged on the left outer side and the right outer side of the main frame correspondingly, a lead screw bidirectional linear module used for driving the two auxiliary beam plates to move in the opposite directions is installed on one side of the top end of the main frame, and a rotation driving assembly is installed in the main frame. And an elastic self-adjusting rolling structure is installed on the outer wall of the side, close to the main beam plate, of the auxiliary beam plate and used for pressing the neck of the packaging bag on the back frame, and the packaging bag can be conveyed, so that a bag opening is smoothly fed into a heat sealing area.

Description

Technical Field

[0001] This invention belongs to the technical field of packaging bag conveying devices, specifically, it relates to a heat-sealing conveying device for food packaging bags, as well as heat-sealing equipment and methods. Background Technology

[0002] Food-grade plastic packaging bag heat-sealing equipment is a specialized mechanical device for heat-sealing plastic packaging bags. Its core principle is to melt and fuse thermoplastic materials at the bag opening through heating and applying pressure, thereby achieving a seal. The equipment mainly consists of a heat-melting component, a conveying system, a control system, and a cooling system. The heat-melting component is responsible for heating the bag opening to a molten state and pressing it together using mechanical pressure to ensure a good fusion effect. The conveying system typically uses a belt conveyor, which uses friction to stably transport the plastic bags to be heat-sealed to the working area of ​​the heat-melting component. In actual operation, the operator needs to correctly feed the neatly leveled bag opening into the conveyor belt inlet. The equipment then automatically completes a continuous cycle of clamping, heat pressing, cooling, and output. The operator must continuously visually inspect the seal appearance and periodically sample and perform tear tests to verify the seal strength. Then, the heat-sealing parameters are finely adjusted to ensure the heat-sealing effect.

[0003] Chinese invention patent application number CN202510853076.7 discloses a heat-sealing device for plastic packaging bags, comprising: a housing; a conveying unit for clamping and conveying plastic packaging bags, wherein two heat-sealing units for heat-sealing the plastic packaging bags and two cooling units for cooling the sealed end of the heat-sealed plastic packaging bags; a liquid pump; a heat dissipation unit for cooling the fluid flowing through the pipes; and a frame, fixedly installed at the bottom of the housing for supporting the heat-sealing components. The frame, through the combination of the cooling units, liquid pump, and heat dissipation units, forms a refrigeration cycle, which promptly cools and dissipates heat from the sealed end of the plastic packaging bags after heat sealing, allowing the plastic to solidify quickly.

[0004] Therefore, it is evident that existing plastic packaging bag conveying devices and heat sealing equipment mainly adopt a single-station, single-bag sealing structure. Consequently, the entire heat sealing cycle, including feeding, clamping, heating and pressing, cooling, releasing, and discharging, must be completed sequentially at one station. When processing large quantities of packaging, the single-station setup can easily become a bottleneck in the speed of the entire production line, restricting the overall heat sealing capacity. Furthermore, the conveyor belt and extrusion belt transport the plastic packaging bag body and mouth for subsequent heat sealing. In this process, the conveyor belt mainly supports the bottom of the plastic packaging bag and cannot provide lateral support to the bag body. For food packaging bags containing powder or granular products, the bag body is full and the center of gravity is unstable. With only bottom support, the bag is prone to swaying, twisting, or even tipping over during the journey. At this time, the defect rate will increase significantly, and the operator must frequently intervene to straighten it. Summary of the Invention

[0005] The purpose of this invention is to provide a heat-sealing conveying device and heat-sealing equipment and method for food packaging bags. Based on the thickness of the bag opening to be packaged, a two-way linear module with a lead screw drives two auxiliary beams close to the first steel strip on the outer wall of the main frame. The gap between the auxiliary beams and the first steel strip is adjusted to accommodate different bag opening thicknesses. A control box activates the rotary drive assembly, thereby powering the V-shaped side-support conveyor lines on both sides of the main frame. The operator then places the packaging bag containing powder or granular products onto the V-shaped side-support conveyor line and adjusts the bag opening so that it is positioned between the auxiliary beam and the first steel strip. The elastic self-adjusting rolling structure continuously presses the bag opening against the back frame until the packaging bag is heat-sealed and conveyed out by the V-shaped side-support conveyor line, thus solving the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A heat-sealing conveying device for food packaging bags includes a main frame. Two main beam plates are symmetrically installed on the left and right outer walls of the main frame. A V-shaped side-support conveyor line and a back frame are installed on the outer wall of the main frame below the main beam plates. The V-shaped side-support conveyor line is used to convey packaging bags along the length of the main frame. A first steel bar is fixedly installed on the outer wall of the main beam plate away from the main frame. A secondary beam plate parallel to the main beam plate is provided on both the left and right outer sides of the main frame. A two-way linear screw module for driving the two secondary beam plates to move in opposite directions is installed on one side of the top of the main frame. A rotary drive assembly for synchronously outputting rotational power to the two V-shaped side-support conveyor lines is installed inside the main frame. An elastic self-adjusting rolling structure is installed on the outer wall of the secondary beam plate near the main beam plate. The elastic self-adjusting rolling structure is used to press the neck of the packaging bag onto the back frame.

[0007] Further optimization: Guide rods are slidably installed on both sides of the main beam plate and near its two ends. The guide rods are slidably arranged along the width direction of the main frame. One end of the guide rod is fixedly connected to the outer wall of one side of the corresponding sub-beam plate. The other ends of the two guide rods on the same side are fixedly connected to the inner beam plate. One side of the top of the inner beam plate is integrally formed with an upwardly extending connecting plate. The two connecting plates are fixedly connected to the two moving ends of the two-way linear screw module.

[0008] The following are further optimizations of the above technical solution by the present invention: The rotary drive assembly includes a shaft platform fixedly installed inside the main frame. Two gear shafts are meshed and rotatably mounted on both sides of the bottom end of the shaft platform. A stepper motor is fixedly installed on the top end of the shaft platform, and the power output shaft of the stepper motor is fixedly connected to the upper end of one of the gear shafts.

[0009] Further optimization: The V-shaped side-supported conveyor line includes two active belt rollers that are rotatably mounted on the outer walls of both sides of the main frame. Obtuse-angled base platforms are fixedly connected to the outer walls of both sides of the main frame near their lower positions. A second conveyor belt and a thin conveyor belt are installed between the two active belt rollers on the same side. A gap is provided between the second conveyor belt and the thin conveyor belt for the elastic self-adjusting rolling structure to contact the back frame. The lower end of one of the active belt rollers is connected to the corresponding gear shaft through a transmission assembly.

[0010] Further optimization: Driven belt roller 1 and driven belt roller 2 are rotatably mounted on the obtuse-angled base near the inclined outer wall of the main frame. A side conveyor belt is installed between driven belt roller 1 and driven belt roller 2. The extension line of the central axis of driven belt roller 1 intersects the extension line of the central axis of the corresponding driving belt roller at a 45-degree angle. The lower ends of driven belt roller 1 and driving belt roller 2 are fixedly connected to bevel gears, and the two corresponding bevel gears mesh with each other.

[0011] Further optimization: A discharge channel is fixedly installed on the side of the obtuse-angled base away from the driven belt roller, and a bracket for supporting the inner side of the conveyor belt is also fixed on the outer wall of one side of the obtuse-angled base.

[0012] Further optimization: A vacuum negative pressure nozzle is installed at one end inside the first steel bar, and the vacuum negative pressure nozzle is located above the thin conveyor belt.

[0013] Further optimization: The elastic self-adjusting rolling structure includes a second steel bar fixedly installed on the side of the sub-beam plate near the main beam plate. Several right-angle sheet metal seats are installed at equal intervals along the length direction at the bottom end of the second steel bar. An elastic pin is installed at the lower position inside the right-angle sheet metal seat. A shaft bracket is fixedly installed on the movable end of the elastic pin. A vertical shaft is bolted to the inside of the shaft bracket. A pressure roller is rotatably installed at the lower end of the vertical shaft. A rubber strip is detachably installed on the outer wall of the second steel bar near the main frame.

[0014] The present invention also provides a heat-sealing device for food packaging bags. Based on the above-mentioned heat-sealing conveying device for food packaging bags, a hot pressing assembly is also installed on one outer wall of the sub-beam plate. The hot pressing assembly includes a double-cylinder seat fixedly installed on the outer wall of the sub-beam plate. An automatic telescopic rod is fixedly installed on the double-cylinder seat. The piston rod of the automatic telescopic rod slides through the double-cylinder seat and is fixedly connected to an end plate. An electric heating plate is installed on the outer wall of the end plate near the main frame. The electric heating plate is parallel to and opposite to the first steel bar.

[0015] The present invention also provides a method for heat-sealing food packaging bags, using the aforementioned food packaging bag heat-sealing equipment, comprising the following steps: S101: First, start the two-way linear screw module to drive the left and right sets of hot pressing components to move towards each other, so that the gap between them and the corresponding first steel bar on the outer wall of the main frame is adjusted to the optimal distance suitable for the current bag opening thickness. S102: Then start the rotary drive assembly to provide power to the V-shaped side support conveyor lines on the left and right sides. The two V-shaped side support conveyor lines start to run synchronously and smoothly. Two operators stand on the left and right sides of the equipment respectively. They put the food packaging bags containing powder or granular products into the entrance of the V-shaped side support conveyor line. At this time, the food packaging bags maintain an upright posture and move forward smoothly under the constraint of the V-shaped side support conveyor line. The operators then adjust the bag opening and accurately guide the bag opening into the predetermined gap between the heat pressing assembly and the first steel bar, which has been adjusted. When the bag opening enters the heat sealing area with the conveyor line, the elastic self-adjusting rolling structure automatically and evenly presses the bag opening onto the back frame based on its own elastic design. S103: After the bag opening enters the heat-sealing area, the bag opening is escorted by constant pressure from the elastic self-adjusting roller structure through the heat-sealing zone composed of the hot-pressing component and the first steel strip. The hot-pressing component melts and bonds the plastic, and the bag opening begins to cool and solidify during the subsequent removal of the hot-pressing component. During the heat-sealing process, observe whether the bag opening enters smoothly and whether the elastic self-adjusting roller structure works normally. S104: The heat-sealed packaging bags are smoothly delivered by the V-shaped side-support conveyor line and fall into the end collection box or connect to the next section of the conveyor belt.

[0016] The present invention, by adopting the above technical solution, has at least the following beneficial effects: 1. This invention, based on the thickness of the packaging bag opening, utilizes a two-way linear screw module to drive two secondary beam plates close to the first steel bar on the outer wall of the main frame. This adjusts the gap between the secondary beam plates and the first steel bar to accommodate the packaging bag opening thickness. The rotary drive assembly is activated via a control box, powering the V-shaped side-support conveyor lines on both sides of the main frame. The operator then places the packaging bag containing powder or granular products onto the V-shaped side-support conveyor line and adjusts the bag opening so that it is positioned between the secondary beam plate and the first steel bar. The flexible self-adjusting roller structure continuously presses the bag opening against the back frame until the packaging bag is heat-sealed and sent out by the V-shaped side support conveyor line. The dual-station design enables parallel processing, allowing more packaging bags to be processed in the same time period. The V-shaped side support conveyor line provides stable support for the bag body through the V-shaped side support, effectively reducing the offset and twisting of the packaging bag during transportation and heat sealing. This allows the bag opening to be sent into the heat sealing area in a defined and controlled trajectory, reducing film misalignment, wrinkles or contamination caused by bag shaking, and ensuring a high success rate of heat sealing.

[0017] 2. In this invention, the distance between the secondary beam plate and the first steel bar is adjusted by a two-way linear module with a lead screw. Combined with an elastic self-adjusting rolling structure, this allows for rapid and precise adaptive adjustment of bag openings of different thicknesses. This ensures the accuracy of the gap between the heat-pressing surface and the back frame. Furthermore, the elastic self-adjusting rolling structure automatically compensates for minor local thickness or flatness differences at the bag opening, continuously and evenly pressing the bag opening onto the back frame. This ensures uniform stress and consistent heat transfer throughout the heat-sealing line, resulting in a seal with high sealing strength and a smooth, uniform appearance, thus improving the consistency and reliability of the sealing quality. Finally, the stable conveying of the dual-station layout and V-shaped side-support conveyor line eliminates the need for operators to spend time on the precise positioning and posture maintenance of individual bags. The equipment's ability to handle complex packaging conditions is enhanced, reducing downtime for cleaning due to bag tipping or leakage, making the production process smoother and faster. Attached Figure Description

[0018] Figure 1 The three-dimensional representation of the overall structure in the embodiments of the present invention Figure 1 ; Figure 2 The three-dimensional representation of the overall structure in the embodiments of the present invention Figure 2 ; Figure 3 This is a front view of the overall structure in an embodiment of the present invention; Figure 4 This is a three-dimensional structural diagram of the V-shaped side-supported conveyor line in an embodiment of the present invention; Figure 5 This is a three-dimensional structural diagram of the rotary drive component in an embodiment of the present invention; Figure 6 This is a three-dimensional structural diagram of the hot-pressing assembly in an embodiment of the present invention. Figure 1 ; Figure 7 This is a three-dimensional structural diagram of the hot-pressing assembly in an embodiment of the present invention. Figure 2 ; Figure 8 The three-dimensional representation of the overall structure in the embodiments of the present invention Figure 3 ; Figure 9 for Figure 8 A magnified view of a portion of point A in the middle.

[0019] In the diagram: 1-Main frame; 2-Main beam plate; 201-First steel bar; 202-Vacuum negative pressure nozzle; 3-Secondary beam plate; 301-Guide rod; 302-Inner beam plate; 303-Connecting plate; 304-Second steel bar; 305-Rubber strip; 4-Hot pressing assembly; 401-Double sleeve cylinder seat; 402-Automatic telescopic rod; 403-End plate; 404-Heating plate; 405-Sliding rod; 5-Screw bidirectional linear module; 6-Elastic self-adjusting rolling structure; 601-Right angle sheet metal seat; 602-Elastic pin ; 603-Shaft frame; 604-Vertical shaft; 605-Pressure roller; 7-V-type side-supported conveyor line; 701-Obtuous angle base; 702-Driven belt roller one; 703-Driven belt roller two; 704-Side conveyor belt; 705-Bracket; 706-Driven belt roller; 707-Second conveyor belt; 708-Fine conveyor belt; 709-Back frame; 710-Bevel gear; 711-Discharge channel; 8-Rotary drive assembly; 801-Shaft platform; 802-Gear shaft; 803-Stepper motor; 9-Control box. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0021] like Figures 1 to 3 As shown, a heat-sealing conveying device for food packaging bags includes a main frame 1. Two main beam plates 2 are symmetrically installed on the left and right outer walls of the main frame 1. A V-shaped side-support conveyor line 7 and a back frame 709 are installed on the outer wall of the main frame 1 below the main beam plates 2. The V-shaped side-support conveyor line 7 is used to convey packaging bags along the length of the main frame 1. A first steel bar 201 is fixedly installed on the outer wall of the main beam plate 2 away from the main frame 1. Sub-beam plates 3 are provided on both the left and right outer sides of the main frame 1, parallel to the main beam plates 2. A two-way linear screw module 5 for driving the two sub-beam plates 3 to move in opposite directions is installed on one side of the top of the main frame 1. A rotary drive assembly 8 for synchronously outputting rotary power to the two V-shaped side-support conveyor lines 7 is installed inside the main frame 1. An elastic self-adjusting rolling structure 6 is installed on the outer wall of the sub-beam plate 3 near the main beam plate 2. The elastic self-adjusting rolling structure 6 is used to press the neck of the packaging bag onto the back frame 709.

[0022] In this embodiment, a control box 9 is installed on one side of the surface of the main frame 1. The control output terminal of the control box 9 is electrically connected to the control input terminal of the lead screw bidirectional linear module 5 and the rotary drive assembly 8, respectively. The control box 9 outputs control signals to independently control the corresponding lead screw bidirectional linear module 5 and rotary drive assembly 8 to work.

[0023] In this embodiment, the main frame 1 is the basic structure of the device, providing overall stability and support, ensuring that the device remains stable during operation, and avoiding displacement or deformation caused by vibration or external force.

[0024] The lead screw bidirectional linear module 5 drives the sub-beam plates 3 on both sides to move synchronously and precisely closer to or further away from the first steel bar 201 on the corresponding side according to the instructions of the control box 9, so as to quickly adapt to the heat sealing gap requirements of packaging bags of different materials and thicknesses.

[0025] In this embodiment, the lead screw bidirectional linear module 5 is existing technology and can be purchased directly from the market. Its specific model is selected according to the overall size of the main frame 1 and the required moving distance of the sub-beam plate 3.

[0026] Guide rods 301 are slidably installed on both sides of the main beam plate 2 and near its two ends. The guide rods 301 are slidably arranged along the width direction of the main frame 1. One end of the guide rod 301 is fixedly connected to the outer wall of one side of the corresponding sub-beam plate 3. The other ends of the two guide rods 301 on the same side are fixedly connected to the inner beam plate 302. One side of the top of the inner beam plate 302 is integrally formed with an upwardly extending connecting plate 303. The two connecting plates 303 are fixedly connected to the two moving ends of the lead screw bidirectional linear module 5 respectively.

[0027] Taking one of the secondary beam plates 3 as an example, the working mechanism of the two-way linear screw module 5 drives the secondary beam plate 3, guide rod 301 and inner beam plate 302 to move towards the vertical center reference plane of the main frame 1 through its moving end. Then, the elastic self-adjusting rolling structure 6 gradually approaches the outer wall of the main frame 1, thereby adjusting the gap between the secondary beam plate 3 and the first steel bar 201 to accommodate packaging bags of different thicknesses.

[0028] In this embodiment, the lead screw bidirectional linear module 5 is activated, and its two moving ends drive the two inner beam plates 302 to move towards each other or away from each other. With the cooperation of the guide rod 301, the secondary beam plates 3 on both sides of the main frame 1 and the elastic self-adjusting rolling structure 6 can be driven to move towards each other or away from each other, which facilitates adjustment operations.

[0029] like Figures 4 to 6 As shown, the rotary drive assembly 8 includes a shaft platform 801 fixedly installed inside the main frame 1. The shaft platform 801 is located below the lead screw bidirectional linear module 5. Two gear shafts 802 are rotatably installed on both sides of the bottom end of the shaft platform 801. The meshing teeth of the two gear shafts 802 mesh with each other. A stepper motor 803 is fixedly installed on the top end of the shaft platform 801. The power output shaft of the stepper motor 803 is fixedly connected to the upper end of one of the gear shafts 802.

[0030] With this design, the two gear shafts 802 mesh with each other through meshing teeth. At this time, the stepper motor 803 is started to drive the two gear shafts 802 to rotate synchronously.

[0031] When the rotary drive assembly 8 outputs rotary power to the two sets of V-shaped side-supported conveyor lines 7, the stepper motor 803 in the rotary drive assembly 8 starts and drives one of the gear shafts 802 to rotate, while the other gear shaft 802 rotates synchronously due to meshing. At this time, the two gear shafts 802 transmit rotary power to the corresponding V-shaped side-supported conveyor lines 7, and the conveying speed of the two V-shaped side-supported conveyor lines 7 is consistent.

[0032] In this embodiment, the control terminal of the stepper motor 803 is electrically connected to the control output terminal of the control box 9. The control box 9 outputs control signals to control the stepper motor 803 to work in a set direction of rotation, speed, angle, and start / stop time.

[0033] The V-shaped side-supported conveyor line 7 includes two active belt rollers 706 that are rotatably mounted on the outer walls of both sides of the main frame 1. The two active belt rollers 706 on the same side are spaced apart at both ends of the main frame 1 along the length of the main frame 1. Obtuse-angled base platforms 701 are fixedly connected to the outer walls of both sides of the main frame 1 near their lower positions. A second conveyor belt 707 and a thin conveyor belt 708 are installed between the two active belt rollers 706 on the same side. The thin conveyor belt 708 is positioned above the second conveyor belt 707. A gap is provided between the second conveyor belt 707 and the thin conveyor belt 708 for the elastic self-adjusting rolling structure 6 to contact the back frame 709.

[0034] One of the drive belt rollers 706 has its lower end connected to the corresponding gear shaft 802 via a transmission assembly. The rotation of the gear shaft 802 drives the drive belt roller 706 to rotate through the cooperation of the transmission assembly, thereby driving the second conveyor belt 707 to move in a ring.

[0035] The transmission assembly includes two synchronous pulleys and a synchronous belt. The two synchronous pulleys are fixedly installed at the lower ends of the corresponding drive belt roller 706 and gear shaft 802, respectively, and the synchronous belt is sleeved on the two synchronous pulleys.

[0036] A driven belt roller 1 702 and a driven belt roller 2 703 are rotatably mounted on the obtuse-angled base 701 near the inclined outer wall of the main frame 1. A side conveyor belt 704 is installed between the driven belt roller 1 702 and the driven belt roller 2 703. The extension line of the central axis of the driven belt roller 1 702 intersects the extension line of the central axis of the corresponding driving belt roller 706 at a 45-degree angle. The lower ends of the driven belt roller 1 702 and the driving belt roller 706 are fixedly connected to bevel gears 710, and the two corresponding bevel gears 710 mesh with each other.

[0037] Driven belt roller 702 and the corresponding driving belt roller 706 are connected by bevel gear 710. The rotation of the driving belt roller 706 drives the driven belt roller 702 to rotate synchronously through the cooperation of the two bevel gears 710. The rotation of the driven belt roller 702 causes the side conveyor belt 704 to move in a ring through the cooperation of the driven belt roller 703.

[0038] A discharge channel 711 is fixedly installed on the side of the obtuse-angled base 701 away from the driven belt roller 702. The discharge channel 711 is set at the discharge port of the V-shaped side support conveyor line 7 to guide and direct the packaging bags discharged from the V-shaped side support conveyor line 7.

[0039] A bracket 705 is also fixedly installed on one outer wall of the obtuse-angled base 701. The bracket 705 is set inside the side conveyor belt 704 to support the side conveyor belt 704, so that the side conveyor belt 704 can support the packaging bag during the conveying process.

[0040] With this design, the active belt roller 706 rotates under the drive of the synchronous pulley and synchronous belt, thereby enabling the second conveyor belt 707 and the thin conveyor belt 708 to operate along the length of the outer wall of the main frame 1. At the same time, the lower end of the active belt roller 706 also drives the driven belt roller 702 to rotate through the bevel gear 710, causing the side conveyor belt 704 to operate. At this time, the packaging bag is constrained within the V-shaped conveying surface formed by the second conveyor belt 707 and the side conveyor belt 704, thereby effectively supporting the side of the packaging bag and reducing the tilting or deformation of the packaging bag during the conveying process. The bracket 705 is used to provide support for the side conveyor belt 704, so that the side conveyor belt 704 can smoothly convey the packaging bag.

[0041] A vacuum nozzle 202 is installed at one end inside the first steel bar 201, and the vacuum nozzle 202 is located above the thin conveyor belt 708.

[0042] When the vacuum negative pressure nozzle 202 is connected to an external air source, a negative pressure can be formed in the moving area of ​​the bag opening, further maintaining the fit between the bag opening and the back frame 709.

[0043] Because a gap is formed between the thin conveyor belt 708 and the second conveyor belt 707, the elastic self-adjusting rolling structure 6 can flatten and prevent wrinkles on the neck of the packaging bag at this gap.

[0044] The elastic self-adjusting rolling structure 6 includes a second steel bar 304 fixedly installed on the sub-beam plate 3 and located below the heating plate 404. Several right-angle sheet metal seats 601 are installed at equal intervals along the length direction at the bottom end of the second steel bar 304. An elastic pin 602 is installed at the lower position inside the right-angle sheet metal seat 601. A shaft bracket 603 is fixedly installed on the movable end of the elastic pin 602. A vertical shaft 604 is bolted to the inside of the shaft bracket 603. A pressure roller 605 is rotatably installed at the lower end of the vertical shaft 604.

[0045] When the lead screw bidirectional linear module 5 drives the elastic self-adjusting rolling structure 6 to press on the back frame 709, the elastic pin 602 generates its own elastic force, and the rim of the pressure roller 605 presses the neck of the packaging bag onto the back frame 709, thereby automatically compensating for the unevenness of the bag opening caused by uneven filling, film micro-wrinkles, or thickness fluctuations.

[0046] The staff can adjust the height of the vertical shaft 604 and the pressure roller 605 in the shaft frame 603 to adjust the contact position between the pressure roller 605 and the neck of the packaging bag.

[0047] In this embodiment, a rubber strip 305 is detachably installed on the outer wall of the second steel strip 304 near the main frame 1. The rubber strip 305 can protect the second steel strip 304 and the main frame 1 and prevent them from making hard contact.

[0048] like Figures 6 to 9 As shown, the present invention also provides a food packaging bag heat sealing device. Based on the above-mentioned food packaging bag heat sealing conveying device, the heat sealing device includes a heat pressing component 4. A heat pressing component 4 is installed on one side of the outer wall of each sub-beam plate 3. The heat pressing component 4 is activated and cooperates with the first steel bar 201 to perform heat sealing operation on the bag opening of the packaging bag.

[0049] In this embodiment, the first steel strip 201 serves as the mating surface of the hot-pressing assembly 4, ensuring that the bag opening can be evenly stressed and heat conducted during the heat sealing process, reducing heat sealing defects caused by uneven pressure, and improving the heat sealing effect on the bag opening.

[0050] The hot pressing assembly 4 includes a double-sleeved cylinder seat 401 fixedly installed on the outer wall of the sub-beam plate 3. An automatic telescopic rod 402 is fixedly installed on the double-sleeved cylinder seat 401. The piston rod of the automatic telescopic rod 402 slides through the double-sleeved cylinder seat 401 and is fixedly connected to an end plate 403.

[0051] An electric heating plate 404 is installed on the outer wall of the end plate 403 near the main frame 1. The electric heating plate 404 is parallel to and opposite the first steel bar 201. The electric heating plate 404 is electrically connected to an external power source. The control end of the electric heating plate 404 is electrically connected to the output end of the control box 9. The control box 9 is used to control the start of the electric heating plate 404 and regulate its heating temperature.

[0052] The staff controls the automatic telescopic rod 402 through the control box 9 to move it. The automatic telescopic rod 402 further pushes the end plate 403 and the electric heating plate 404 closer to the first steel bar 201, thereby ensuring that there is sufficient contact pressure between the electric heating plate 404 and the opening of the packaging bag. At this time, the electric heating plate 404 heats up and performs a heat sealing operation on the opening of the packaging bag with the cooperation of the first steel bar 201.

[0053] In this embodiment, the control end of the automatic telescopic pole 402 is electrically connected to the control output end of the control box 9. The control box 9 outputs control signals to control the automatic telescopic pole 402 to work in the set telescopic direction, telescopic speed, telescopic distance and start / stop time.

[0054] In this embodiment, the automatic telescopic rod 402 is one of an electric telescopic rod, a hydraulic cylinder, and a telescopic cylinder.

[0055] In this embodiment, two sliding rods 405 are slidably installed on the double-sleeved cylinder seat 401. The two sliding rods 405 are parallel and spaced apart on both sides of the automatic telescopic rod 402. The end of the sliding rod 405 near the end plate 403 is fixedly connected to the end plate 403. When the sliding rod 405 slides on the double-sleeved cylinder seat 401, it is used to guide the movement of the end plate 403 and improve the stability of the end plate 403 when it moves.

[0056] In this embodiment, the control box 9 is existing technology. Its specific structure includes a main controller and a touch screen. The touch screen is communicatively connected to the main controller. The main controller is used to output control signals or receive feedback and detection signals. The touch screen is used to input debugging control parameters or display control operation parameters.

[0057] The present invention also provides a method for heat-sealing food packaging bags, using the aforementioned food packaging bag heat-sealing equipment, comprising the following steps: S101: The control box 9 controls the start of the two-way linear module 5 to drive the left and right sets of hot pressing components 4 to move towards each other, so that the gap between them and the corresponding first steel strip 201 on the outer wall of the main frame 1 is adjusted to the optimal distance suitable for the current bag opening thickness.

[0058] The specific operation process of step S101 is as follows: the two-way linear module 5 of the lead screw starts and drives the two inner beam plates 302 to move towards each other or away from each other through the two moving ends. With the cooperation of the guide rod 301, the secondary beam plates 3, the hot pressing component 4 and the elastic self-adjusting rolling structure 6 on both sides of the main frame 1 can be driven to move towards each other or away from each other, thereby realizing the adjustment of the gap distance between the hot pressing component 4 and the first steel strip 201 to adapt to packaging bags of different thicknesses, making it convenient to use and improving the scope of use.

[0059] S102: The rotary drive assembly 8 is started through the control box 9. The rotary drive assembly 8 provides power to the V-shaped side support conveyor lines 7 on the left and right sides. The two V-shaped side support conveyor lines 7 start to run synchronously and smoothly. Two operators stand at the workstations on the left and right sides of the equipment respectively. They place the food packaging bags containing powder or granular products into the entrance of the V-shaped side support conveyor line 7. At this time, the food packaging bags maintain an upright posture and move forward smoothly under the constraint of the V-shaped side support conveyor line 7. The operators then adjust the bag opening and accurately guide the bag opening into the predetermined gap between the heat pressing assembly 4 and the first steel bar 201, which has been adjusted. When the bag opening enters the heat sealing area with the conveyor line, the elastic self-adjusting rolling structure 6 automatically and evenly presses the bag opening onto the back frame 709 based on its own elastic design.

[0060] In step S102, the working principle of the rotary drive assembly 8 and the V-shaped side support conveyor line 7 is as follows: the stepper motor 803 in the rotary drive assembly 8 starts and drives one of the gear shafts 802 to rotate, while the other gear shaft 802 rotates synchronously due to meshing. At this time, the two gear shafts 802 drive the active belt roller 706 in the corresponding side of the V-shaped side support conveyor line 7 to rotate through the transmission action of the synchronous pulley and the synchronous belt, respectively. At this time, the second conveyor belt 707 and the thin conveyor belt 708 on both sides of the main frame 1 can operate. At the same time, the lower end of the active belt roller 706 also drives the driven belt roller 702 to rotate through the bevel gear 710, so that the side conveyor belt 704 can operate. At this time, the packaging bag is constrained in the V-shaped conveying surface formed by the second conveyor belt 707 and the side conveyor belt 704, thereby effectively supporting the side of the packaging bag and reducing the tilting or deformation of the packaging bag during the conveying process. The bracket 705 is used to provide support force for the side conveyor belt 704, so that the side conveyor belt 704 can transport the packaging bag smoothly.

[0061] In step S102, the working principle of the elastic self-adjusting rolling structure 6 is as follows: when the lead screw bidirectional linear module 5 drives the elastic self-adjusting rolling structure 6 to press on the back frame 709, the elastic pin 602 generates its own elastic force, and the rim of the pressure roller 605 presses the neck of the packaging bag onto the back frame 709, thereby automatically compensating for the unevenness of the bag opening caused by uneven filling, film micro-wrinkles, or thickness fluctuations.

[0062] S103: After the bag opening enters the heat-sealing area, the bag opening is escorted by constant pressure from the elastic self-adjusting rolling structure 6 through the heat-sealing zone composed of the hot-pressing component 4 and the first steel strip 201. The hot-pressing component 4 melts and bonds the plastic, and the bag opening begins to cool and solidify during the subsequent removal of the hot-pressing component 4. During the heat-sealing process, observe whether the bag opening enters smoothly and whether the elastic self-adjusting rolling structure 6 works normally.

[0063] In step S103, the working principle of the hot pressing assembly 4 is as follows: the control box 9 controls the automatic telescopic rod 402 to move, and the automatic telescopic rod 402 further pushes the end plate 403 and the electric heating plate 404 closer to the first steel bar 201, thereby ensuring that there is sufficient contact pressure between the electric heating plate 404 and the bag opening of the packaging bag. At this time, the electric heating plate 404 heats up and performs a heat sealing operation on the bag opening of the packaging bag through the cooperation of the first steel bar 201.

[0064] S104: The heat-sealed packaging bag is smoothly delivered by the V-shaped side-support conveyor line 7 and falls into the end collection box or is connected to the next section of the conveyor belt.

[0065] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A heat-sealing conveying device for food packaging bags, characterized in that: The main frame (1) includes two main beam plates (2) symmetrically installed on the left and right outer walls of the main frame (1). A V-shaped side-supported conveyor line (7) and a back frame (709) are installed on the outer wall of the main frame (1) below the main beam plate (2). The V-shaped side-supported conveyor line (7) is used to transport packaging bags along the length of the main frame (1). A first steel bar (201) is fixedly installed on the outer wall of the main beam plate (2) away from the main frame (1). The left and right outer sides of the main frame (1) are provided with a retaining structure that is compatible with the main beam plate (2). The main frame (1) has a parallel sub-beam plate (3) and a screw bidirectional linear module (5) installed on one side of the top of the main frame (1) to drive the two sub-beam plates (3) to move in opposite directions. The main frame (1) has a rotary drive assembly (8) installed inside to synchronously output rotary power to the two V-shaped side-supported conveyor lines (7). The sub-beam plate (3) has an elastic self-adjusting rolling structure (6) installed on the outer wall of the side of the sub-beam plate (3) close to the main beam plate (2). The elastic self-adjusting rolling structure (6) is used to press the neck of the packaging bag onto the back frame (709).

2. The food packaging bag heat-sealing conveyor device according to claim 1, characterized in that: Guide rods (301) are slidably installed on both sides of the main beam plate (2) and near its two ends. The guide rods (301) are slidably arranged along the width direction of the main frame (1). One end of the guide rod (301) is fixedly connected to the outer wall of one side of the corresponding sub-beam plate (3). The other ends of the two guide rods (301) on the same side are fixedly connected to the inner beam plate (302). One side of the top of the inner beam plate (302) is integrally formed with an upwardly extending connecting plate (303). The two connecting plates (303) are fixedly connected to the two moving ends of the lead screw bidirectional linear module (5).

3. The food packaging bag heat-sealing conveyor device according to claim 2, characterized in that: The rotary drive assembly (8) includes a shaft platform (801) fixedly installed inside the main frame (1). Two gear shafts (802) are installed on both sides of the bottom end of the shaft platform (801) in a meshing and rotating manner. A stepper motor (803) is fixedly installed on the top end of the shaft platform (801). The power output shaft of the stepper motor (803) is fixedly connected to the upper end of one of the gear shafts (802).

4. The food packaging bag heat-sealing conveyor device according to claim 3, characterized in that: The V-shaped side-supported conveyor line (7) includes two active belt rollers (706) that are rotatably installed on the outer walls of the two sides of the main frame (1). Obtuse-angled bases (701) are fixedly connected to the outer walls of the two sides of the main frame (1) near their lower positions. A second conveyor belt (707) and a thin conveyor belt (708) are installed between the two active belt rollers (706) on the same side. A gap is provided between the second conveyor belt (707) and the thin conveyor belt (708) for the elastic self-adjusting rolling structure (6) to contact the back frame (709). The lower end of one of the active belt rollers (706) is connected to the corresponding gear shaft (802) through a transmission assembly.

5. The food packaging bag heat-sealing conveyor device according to claim 4, characterized in that: The obtuse-angled base (701) has a driven belt roller 1 (702) and a driven belt roller 2 (703) rotatably mounted on the inclined outer wall near the main frame (1). A side conveyor belt (704) is installed between the driven belt roller 1 (702) and the driven belt roller 2 (703). The extension line of the central axis of the driven belt roller 1 (702) intersects the extension line of the central axis of the corresponding driving belt roller (706) at a 45-degree angle. The lower ends of the driven belt roller 1 (702) and the driving belt roller (706) are fixedly connected with bevel gears (710), and the two corresponding bevel gears (710) mesh with each other.

6. The food packaging bag heat-sealing conveyor device according to claim 5, characterized in that: The obtuse-angled base (701) has a discharge channel (711) fixedly installed on the side away from the driven belt roller (702), and a bracket (705) for supporting the inner side of the side conveyor belt (704) is also fixed on the outer wall of one side of the obtuse-angled base (701).

7. The food packaging bag heat-sealing conveyor device according to claim 6, characterized in that: A vacuum nozzle (202) is installed at one end inside the first steel bar (201), and the vacuum nozzle (202) is located above the thin conveyor belt (708).

8. A food packaging bag heat-sealing conveying device according to claim 8, characterized in that: The elastic self-adjusting rolling structure (6) includes a second steel bar (304) fixedly installed on the side of the sub-beam plate (3) near the main beam plate (2). Several right-angle sheet metal seats (601) are installed at equal intervals along the length direction at the bottom end of the second steel bar (304). An elastic pin (602) is installed at the lower position inside the right-angle sheet metal seat (601). A shaft frame (603) is fixedly installed on the movable end of the elastic pin (602). A vertical shaft (604) is bolted to the inside of the shaft frame (603). A pressure roller (605) is rotatably installed at the lower end of the vertical shaft (604). A rubber strip (305) is detachably installed on the outer wall of the second steel bar (304) near the main frame (1).

9. A heat-sealing device for food packaging bags, based on the heat-sealing conveying device for food packaging bags as described in claim 8, characterized in that: A hot pressing assembly (4) is also installed on one side of the outer wall of the sub-beam plate (3). The hot pressing assembly (4) includes a double-cylinder seat (401) fixedly installed on the outer wall of the sub-beam plate (3). An automatic telescopic rod (402) is fixedly installed on the double-cylinder seat (401). The piston rod of the automatic telescopic rod (402) slides through the double-cylinder seat (401) and is fixedly connected to an end plate (403). An electric heating plate (404) is installed on the outer wall of the end plate (403) near the main frame (1). The electric heating plate (404) is parallel to and opposite to the first steel bar (201).

10. A method for heat-sealing food packaging bags, using the food packaging bag heat-sealing equipment as described in claim 9, characterized in that: Includes the following steps: S101: First, start the screw bidirectional linear module (5) to drive the left and right hot pressing components (4) to move towards each other, so that the gap between them and the corresponding first steel strip (201) on the outer wall of the main frame (1) is adjusted to the optimal distance suitable for the current bag opening thickness. S102: Then start the rotary drive assembly (8) to provide power to the V-shaped side support conveyor lines (7) on the left and right sides. The two V-shaped side support conveyor lines (7) start to run synchronously and smoothly. Two operators stand on the left and right sides of the equipment respectively and put the food packaging bag containing powder or granular products into the entrance of the V-shaped side support conveyor line (7). At this time, the food packaging bag maintains an upright posture and moves forward smoothly under the constraint of the V-shaped side support conveyor line (7). The operator adjusts the bag opening and guides the bag opening accurately to the predetermined gap between the heat pressing assembly (4) and the first steel bar (201) with the adjusted gap. When the bag opening enters the heat sealing area with the conveyor line, the elastic self-adjusting rolling structure (6) automatically and evenly presses the bag opening onto the back frame (709) based on its own elastic design. S103: After the bag opening enters the heat-sealing area, the bag opening is escorted by the constant pressure of the elastic self-adjusting rolling structure (6) and passes through the heat-sealing area composed of the hot-pressing component (4) and the first steel bar (201). The hot-pressing component (4) melts and bonds the plastic, and the bag opening begins to cool and solidify in the process of removing the hot-pressing component (4) in the future. During the heat-sealing process, observe whether the bag opening enters smoothly and whether the elastic self-adjusting rolling structure (6) works normally. S104: The heat-sealed packaging bag is smoothly delivered by the V-shaped side-support conveyor line (7) and falls into the end collection box or is connected to the next section of the conveyor belt.

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