Plastic packaging sealing device

Abstract

The present application relates to the technical field of packaging and sealing, and discloses a plastic packaging and sealing device, including a frame, a transmission mechanism, and a sealing mechanism. The transmission mechanism includes a conveyor belt rotatably arranged on the frame, and a clamping mechanism is arranged on the frame. The clamping mechanism includes two clamping plates hinged on the conveyor belt and arranged opposite to each other, and the clamping plates include a horizontal plate hinged to the upper surface of the conveyor belt, and two vertical plates respectively arranged perpendicularly at both ends of the horizontal plate. The bottoms of the horizontal plates of the two clamping plates are connected by the same hinge axis, and the horizontal plates of the two clamping plates are attached to and clamped on the bottom of the packaging bag, and the vertical plates of the two clamping plates are attached to and clamped on both sides of the packaging bag. A driving component for driving the two clamping plates to attach is arranged on the conveyor belt. The present application has the function of timely clamping and positioning the plastic bag during the sealing process, facilitating alignment and sealing, and improving the sealing quality.

Description

Technical Field

[0001] The present application relates to the technical field of packaging sealing, and in particular to a plastic packaging sealing device. Background Art

[0002] The general food industry uses plastic bags to package food, and the raw materials are mostly thermoplastic materials such as polyethylene and polypropylene. After placing the product in the plastic bag, the opening of the bag needs to be sealed. As a type of plastic bag production equipment, the plastic bag sealing device greatly improves the production efficiency of plastic bags.

[0003] Existing plastic packaging sealing devices usually lay plastic bags flat on a conveyor belt. After the sealed part of the plastic bag is brought into the heating zone, a heating block is used to heat and soften the plastic bag film to achieve sealing of the plastic bag. After sealing, the conveyor belt sends the sealed packaging bag out of the machine to complete the sealing operation.

[0004] However, in the process of implementing the relevant technical solutions, it was found that at least the following technical problems exist: when the packaging bags are conveyed, since the packaging bags are not clamped and positioned, during the sealing process, the plastic bags will move due to airflow or other resistances, resulting in deviations in the sealing position, which in turn leads to poor sealing effect. Summary of the invention

[0005] The present application provides a plastic packaging sealing device, which solves the problem that when the packaging bag is conveyed, the packaging bag is not clamped and positioned, so that during the sealing process, the plastic bag will move due to the action of airflow or other resistance, thereby causing the sealing position to deviate, and further resulting in poor sealing effect. The application realizes that the plastic bag can be clamped and positioned in time during the sealing process, which facilitates alignment and sealing, and improves the sealing quality.

[0006] The present application provides a plastic packaging sealing device, including a frame, a transmission mechanism, and a sealing mechanism. The transmission mechanism includes a conveyor belt rotatably arranged on the frame, and the frame is provided with a clamping mechanism. The clamping mechanism includes two clamping plates hinged on the conveyor belt and arranged opposite to each other. The clamping plate includes a horizontal plate hinged to the upper surface of the conveyor belt and two vertical plates respectively arranged perpendicularly at both ends of the horizontal plate. The bottoms of the horizontal plates of the two clamping plates are connected by the same hinge axis, the horizontal plates of the two clamping plates are attached to and clamped on the bottom of the packaging bag, and the vertical plates of the two clamping plates are attached to and clamped on both sides of the packaging bag. A driving component for driving the two clamping plates to attach is provided on the conveyor belt.

[0007] Furthermore, the conveyor belt includes chains rotatably arranged on two inner sides of the frame, and transmission plates hinged to the two chains at both ends. A plurality of transmission plates are arranged at intervals along the chain, and each transmission plate is provided with a clamping mechanism.

[0008] The transmission mechanism that the cam is used for the rotation of the transmission mechanism and the transmission mechanism is a plurality of transmission mechanisms, and the transmission mechanism is a plurality of transmission mechanisms, and the plurality of transmission mechanisms are a plurality of transmission mechanisms, and the plurality of transmission mechanisms are a plurality of transmission mechanisms.

[0009] Furthermore, the guide rail includes a first straight section, a second straight section, an arc section and a transition section, the first straight section corresponds to the upper straight section and the length of the first straight section is smaller than that of the upper straight section, the second straight section corresponds to the lower straight section, the two arc sections correspond to the two end arc sections respectively and are concentric, one end of the arc section is smoothly connected to the second straight section, and the other end is smoothly connected to the transition section, and the spacing between the first straight section and the upper straight section of the conveyor belt is smaller than the spacing between the second straight section and the lower straight section of the conveyor belt.

[0010] Furthermore, the sealing mechanism includes a gantry frame arranged on the frame and located in the middle of the conveyor belt, a sealing frame slidably arranged under the gantry frame, two connecting components respectively arranged below the sealing frame, and an electric heating clip arranged on the connecting component, the two electric heating clips are arranged at intervals along the transmission direction of the conveyor belt, and the sealing frame is provided with a braking component for driving the two electric heating clips to open or close.

[0011] Furthermore, the connecting assembly includes a support rod arranged below the sealing frame and a connecting rod hinged on the support rod, two support rods are arranged at intervals in a direction perpendicular to the transmission direction, two parallel connecting rods are hinged on each of the support rods, and the two connecting rods on each of the support rods are hinged to the back side of a movable plate, the electric heating clip is fixed to the other side of the movable plate, and the two electric heating clips are arranged opposite to each other.

[0012] Furthermore, the brake assembly includes a brake cylinder arranged on the sealing frame, a brake rod hinged to the upper end surface of the movable plate and located in the middle, the piston rod end of the brake cylinder passes through the sealing frame and slides with the sealing frame, and the two brake rods are hinged to the piston rod end of the brake cylinder.

[0013] Furthermore, the transmission mechanism includes a transmission motor arranged on one side of the frame, and a sprocket rotatably arranged in the frame, two sprockets are arranged at intervals along the length direction of the frame, and the chain is sleeved on the two sprockets.

[0014] Furthermore, a feed rack is provided on the frame and at the input end of the conveyor belt. The feed rack is inclined from bottom to top in a direction away from the conveyor belt. The lower end of the feed rack is located below the clamping plate where the arc section is close to the connection with the transition section. The lower end of the feed rack is spaced apart from the inner side of the clamping plate and can pass through the clamping plate.

[0015] Furthermore, a discharging rack is arranged on the frame and at the output end of the conveyor belt. The discharging rack is inclined from bottom to top toward the side close to the conveyor belt. The high end of the discharging rack is located below the clamping plate in the middle of the arc section. The high end of the discharging rack is spaced apart from the inner side of the clamping plate and can pass through the clamping plate.

[0016] The technical solution provided in the present application has at least the following technical effects or advantages: 1. Due to the use of a clamping mechanism, the two sides and the bottom of the plastic packaging bag located above the conveyor belt can be clamped, which is convenient for clamping and positioning the plastic packaging bag so that the opening of the packaging bag can correspond to the clamping mechanism. This solves the problem that when the packaging bag is transported, the plastic bag is not clamped and positioned, so that during the sealing process, the plastic bag will move due to airflow or other resistances, thereby causing the sealing position to deviate, and further resulting in poor sealing effect. This realizes the ability to clamp and position the plastic bag during the sealing process, facilitates alignment and sealing, and improves the sealing quality.

[0017] 2. Due to the use of a driving component, the two sides and the bottom of the packaging bag are clamped and positioned while the packaging bag is being transmitted. After the packaging bag is sealed and transmitted to the output end of the conveyor belt, the clamping of the packaging bag is automatically released, so that the sealed packaging bag can be easily collected.

[0018] 3. Due to the use of a sealing mechanism, the two movable plates can be tightened by contracting the brake cylinder. Under the connection effect of the connecting component, the two electric heating clamps can be stably closed to seal the packaging bag. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the embodiment of the present application; Figure 2 It is a schematic diagram of the position of the clamping mechanism in the embodiment of the present application; Figure 3 is a side view of the transmission mechanism in the embodiment of the present application; Figure 4 It is a structural schematic diagram of the sealing mechanism in the embodiment of the present application; Figure 5 for Figure 2 The enlarged schematic diagram of point A in the middle; Figure 6 for Figure 3 The enlarged schematic diagram of point B in the middle; Figure 7 for Figure 3 The enlarged schematic diagram of the center C; In the figure: 1, frame; 2, transmission mechanism; 21, transmission belt; 211, chain; 212, transmission plate; 22, transmission motor; 23, sprocket; 24, upper straight section; 25, lower straight section; 26, end arc section; 3, sealing mechanism; 31, gantry; 32, sealing frame; 33, connecting assembly; 331, support rod; 332, connecting rod; 34, electric heating clip; 35, brake assembly; 351, brake cylinder; 352, brake rod; 36, lifting cylinder; 4, clamping mechanism; 41, clamping plate; 4 11. Horizontal plate; 412. Vertical plate; 42. Driving assembly; 421. Limiting column; 422. Fixing rod; 423. Sliding seat; 424. Limiting plate; 425. Limiting spring; 426. Arc hole; 427. Guide roller; 5. Guide rail; 51. First straight section; 52. Second straight section; 53. Arc section; 54. Transition section; 55. Avoidance groove; 551. Connecting section; 6. Feed rack; 7. Discharge rack; 8. Auxiliary mechanism; 81. Movable cover; 82. Guide plate; 83. Vacuum pump; 84. Elastic hose. DETAILED DESCRIPTION

[0020] The embodiment of the present application discloses a plastic packaging sealing device, which cooperates with the clamping plate 41 and the guide rail 5 to clamp the two sides and the bottom of the plastic packaging bag located above the conveyor belt 21, so as to facilitate the clamping and positioning of the plastic packaging bag, so that the opening of the packaging bag can correspond to the clamping mechanism 4, thereby solving the problem that when the packaging bag is transported, the packaging bag is not clamped and positioned, so that during the sealing process, the plastic bag will move due to the action of airflow or other resistance, thereby causing the sealing position to deviate, and further resulting in poor sealing effect. The device can clamp and position the plastic bag during the sealing process, facilitate alignment and sealing, and improve the sealing quality.

[0021] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0022] Reference Figure 1 , Figure 2A plastic packaging sealing device includes a frame 1, a transmission mechanism 2, a sealing mechanism 3 and a clamping mechanism 4. The frame 1 includes two oppositely arranged vertical plates, and the side of the two vertical plates facing each other is defined as the inner side of the frame 1, and the side of the two vertical plates away from each other is defined as the outer side of the frame 1. The transmission mechanism 2 is installed on the frame 1 and is located between the two vertical plates. The clamping mechanism 4 is installed on the transmission mechanism 2, and is used to clamp the unsealed packaging bags on the transmission mechanism 2. The sealing mechanism 3 is installed on the frame 1 and is located in the middle position of the transmission mechanism 2. The transmission mechanism 2 is arranged along the length direction of the frame 1, and can be used to transport the unsealed packaging bags to the sealing mechanism 3 for sealing, and then transport them to the end of the frame 1 for collection.

[0023] Reference Figure 1 , Figure 2 and Figure 3 The transmission mechanism 2 includes a transmission belt 21, a transmission motor 22, and a sprocket 23. Two sprockets 23 arranged at intervals are rotatably connected on both inner side walls of the frame 1. Each vertical plate has a sprocket 23 arranged opposite to a sprocket 23 on another vertical plate, and there are two groups in total. The centers of the two sprockets 23 arranged opposite to each other on the two vertical plates are fixedly connected through a rotating shaft. The transmission belt 21 is sleeved on the two groups of sprockets 23. The transmission motor 22 is fixedly installed on the outer side of a vertical plate, and the output shaft of the transmission motor 22 passes through the vertical plate and is fixedly connected to the center of a sprocket 23. By driving one sprocket 23 to rotate, the remaining sprockets 23 are driven to rotate in the same direction, thereby driving the transmission belt 21 to rotate. The transmission belt 21 includes a chain 211 and a transmission plate 212. Two chains 211 are provided, and the chains 211 are arranged along the length direction of the frame 1. Each chain 211 is matched with two sprockets 23 on a vertical plate, that is, each chain 211 is sleeved on two sprockets 23 on the same side of the frame 1, and the two ends of the transmission plate 212 are respectively hinged to the inner sides of the two chains 211, and two hinge shafts are provided at both ends of the transmission plate 212. The length direction of the transmission plate 212 is perpendicular to the length direction of the frame 1, that is, the transmission plate 212 is arranged along the width direction of the frame 1. The transmission plate 212 is driven to move by the rotation of the chain 211. A plurality of transmission plates 212 are arranged at intervals along the chain 211, and a clamping mechanism 4 is installed on each transmission plate 212 to clamp and convey the packaging bags.

[0024] Reference Figure 2 , Figure 3 and Figure 4, a clamping mechanism 4 is installed on the frame 1, and the clamping mechanism 4 includes two clamping plates 41 which are hinged on the conveyor belt 21 and arranged opposite to each other. The clamping plates 41 include a horizontal plate 411 and two vertical plates 412. The bottom of the horizontal plates 411 of the two clamping plates 41 is hinged on the conveyor plate 212 through the same hinge axis, and the horizontal plates 411 are arranged along the width direction of the frame 1. Two vertical plates 412 are fixed at both ends of each horizontal plate 411, and the two vertical plates 412 and one horizontal plate 411 form a U shape. A driving component 42 is installed on the conveyor belt 21, which can be used to drive the two clamping plates 41 to open or close. When the horizontal plates 411 of the two clamping plates 41 are in contact, the bottom of the packaging bag can be clamped, and when the vertical plates 412 of the two clamping plates 41 are in contact, the two sides of the packaging bag can be clamped. When the two clamping plates 41 are opened, the sides of the two clamping plates 41 form a V-shaped angle.

[0025] Reference Figure 2 , Figure 3 and Figure 5 The driving assembly 42 includes a limiting column 421, a fixing rod 422, a slide 423, a limiting plate 424, and a limiting spring 425. A horizontal limiting column 421 is fixed on the outer side of each vertical plate 412 and at the middle position. A fixing rod 422 is vertically fixedly installed on the transmission plate 212 and near the end. Two fixing rods 422 are arranged at intervals along the width direction at each end of the transmission plate 212. A fixing block is fixed at the upper end of the fixing rod 422. The slide 423 is inserted into the two fixing rods 422 and slidably cooperates with the fixing rod 422. The limiting plate 424 is vertically fixed to the side of the slide 423 near the vertical plate 412. In addition, two arc holes 426 distributed in an "eight" shape are provided on the limiting plate 424. The two limiting columns 421 located on one side of the conveyor belt 21 are slidably arranged in the two arc holes 426, respectively. The limit spring 425 is sleeved on the fixed rod 422, and the two ends of the limit spring 425 are respectively fixedly connected to the bottom of the slide 423 and the upper end surface of the transmission plate 212. Under the action of the limit spring 425, the slide 423 is located at the position of the fixed rod 422 close to the fixed block, so that the limit column 421 slides on the top of the arc hole 426. The frame 1 is fixedly installed with an annular guide rail 5 spaced from the transmission belt 21, and the other side of the slide 423 is provided with a guide roller 427 slidably connected to the guide rail 5.

[0026] Reference Figure 2 , Figure 3The conveyor belt 21 includes an upper straight section 24, a lower straight section 25, and an end arc section 26 connecting the ends of the upper straight section 24 and the lower straight section 25. Both ends of the upper straight section 24 and the lower straight section 25 are connected by an end arc section 26. The center of the end arc section 26 coincides with the center of the sprocket 23. The guide rail 5 includes a first straight section 51, a second straight section 52, an arc section 53 and a transition section 54. The first straight section 51 corresponds to the upper straight section 24, and the length of the first straight section 51 is less than the upper straight section 24 of the conveyor belt 21. The second straight section 52 corresponds to the lower straight section 25. The two arc sections 53 correspond to the end arc sections 26 of the conveyor belt 21 and are concentrically arranged. One end of the arc section 53 is smoothly connected to the second straight section 52. The two ends of the transition section 54 are smoothly connected to the first straight section 51 and the arc section 53 respectively, and the middle part of the transition section 54 is recessed toward the side close to the conveyor belt 21. The distance between the first straight section 51 and the upper straight section 24 of the conveyor belt 21 is smaller than the distance between the second straight section 52 and the lower straight section 25 of the conveyor belt 21. The guide rail 5 is actually two annular guide rails 5 arranged at intervals, the inner guide rails 5 are close to the conveyor belt 21, and the outer guide rails 5 are far away from the conveyor belt 21. The intervals at the positions corresponding to the second straight section 52 and the arc section 53 and the conveyor belt 21 are equal. When the guide roller 427 is located in the second straight section 52 and the arc section 53, the slide 423 is located at the position of the fixed rod 422 close to the fixed block, the limit column 421 is located at the end of the arc hole 426 close to the conveyor plate 212, the distance between the two limit columns 421 connected to the same limit plate 424 is the largest, and the two clamps 41 are in an open state. When the guide roller 427 slides from the arc section 53 to the transition section 54, the slide seat 423 is driven to gradually slide in the direction away from the fixed block, so that the limiting column 421 gradually slides along the arc hole 426 toward the end away from the transmission plate 212. When the guide roller 427 slides from the transition section 54 to the first straight section 51, the limiting column 421 abuts against the end of the arc hole 426 away from the transmission plate 212, so that the distance between the two limiting columns 421 connected to the same limiting plate 424 is minimized, and the two clamping plates 41 are in a closed state to clamp the corresponding side edges of the packaging bag.

[0027] Reference Figure 3 , Figure 4 and Figure 6The sealing mechanism 3 includes a gantry 31, a sealing frame 32, a connecting assembly 33, and an electric heating clip 34. The two ends of the gantry 31 are fixedly installed on the upper end surface of the frame 1 and are located above the conveyor belt 21. The gantry 31 is located in the middle of the frame 1. The sealing frame 32 is slidably connected below the gantry 31, and the sealing frame 32 can move in the vertical direction. The connecting assembly 33 is installed below the sealing frame 32, and two groups are arranged at intervals along the transmission direction. The electric heating clip 34 is installed on each group of the connecting assembly 33, which can heat and seal the packaging bag. The two electric heating clips 34 are arranged at intervals along the transmission direction of the conveyor belt 21, and the sealing frame 32 is installed with a brake assembly 35 for driving the two electric heating clips 34 to open or close. Two lifting cylinders 36 arranged at intervals are fixedly installed on the top of the gantry 31, and the piston rod end of the lifting cylinder 36 passes through the gantry 31 and is fixedly connected to the top of the sealing frame 32. The lifting cylinder 36 can drive the sealing frame 32 to move up and down, so that the packaging bag can be sealed. After sealing, the sealing frame 32 is driven to rise, so that the sealed packaging bag can be easily transported to the output end of the rack 1. The connecting assembly 33 includes a support rod 331 and a connecting rod 332. One end of the support rod 331 is fixedly installed on the lower end surface of the sealing frame 32, and the other end of the support rod 331 extends vertically downward. Two support rods 331 of each group of connecting assemblies 33 are arranged at intervals in a direction perpendicular to the transmission direction. Two parallel connecting rods 332 are hinged on each support rod 331. The two connecting rods 332 on each support rod 331 are hinged to the back side of a movable plate. The two movable plates are arranged along the width direction of the rack 1 and are parallel to each other. The electric heating clip 34 is fixed to the other side of the movable plate, and the two electric heating clips 34 are arranged opposite to each other. The brake assembly 35 includes a brake cylinder 351 and a brake rod 352. The brake cylinder 351 is fixedly mounted on the upper end surface of the sealing frame 32, and the piston rod end of the brake cylinder 351 passes through the sealing frame 32 and slides with the sealing frame 32. A brake rod 352 is hinged on the upper end surface of each movable plate and located in the middle, and the two brake rods 352 are hinged to the piston rod end of the brake cylinder 351. The two brake rods 352 are connected to form an inverted V shape. By contracting the brake cylinder 351, the angle between the two brake rods 352 can be pulled smaller, thereby bringing the two movable plates closer together, and the two electric heating clips 34 seal the opening of the packaging bag located therebetween. When the brake cylinder 351 extends, it pushes the two brake rods 352, so that the angle between the two brake rods 352 increases, and the connecting rod 332 drives the movable plate to move in the direction away from the two movable plates, thereby releasing the clamping of the packaging bag opening. The sealing frame 32 is driven to rise, so that the packaging bag can continue to be transported after being sealed.

[0028] Reference Figure 2 , Figure 3A feed rack 6 is installed on the frame 1 and at the input end of the conveyor belt 21. The feed rack 6 is inclined from bottom to top in a direction away from the conveyor belt 21. The lower end of the feed rack 6 is located below the clamping plate 41 near the connection between the arc section 53 and the transition section 54. The lower end of the feed rack 6 is spaced from the inner side of the clamping plate 41 and can pass through the clamping plate 41. Multiple packaging bags are placed on the feed rack 6 in sequence, and the inclined feed rack 6 slides between the clamping plates 41 near the connection between the arc section 53 and the transition section 54. Since the plastic packaging bag is filled with products, the hardness of the side and bottom edges of the packaging bag is relatively low. When a clamping plate 41 at the input end of the conveyor belt 21 moves from the arc section 53 to the transition section 54, combined with the gravity of the packaging bag itself, the side and bottom edges of the packaging bag are folded and fall between the two clamping plates 41. When the packaging bag is stuck at the feed rack 6, the packaging bag can also be adjusted manually and placed between the two clamping plates 41. When the packaging bag continues to be conveyed, the two clamps 41 clamp the packaging bag by the action of the guide rail 5. A discharging rack 7 is installed on the frame 1 and at the output end of the conveyor belt 21. The discharging rack 7 is tilted from bottom to top toward the side close to the conveyor belt 21. The high end of the discharging rack 7 is located below the clamp 41 in the middle of the arc section 53. The high end of the discharging rack 7 is spaced from the inner side of the clamp 41 and can pass through the clamp 41. When the sealed packaging bag passes through the transition section 54 close to the output end of the conveyor belt 21, the two clamps 41 gradually loosen their grip on the packaging bag until the clamp 41 of the arc section 53 at the output end of the conveyor belt 21 passes through the discharging rack 7, so that the packaging bag is dumped on the discharging rack 7 and is discharged by the discharging rack 7.

[0029] Reference Figure 2 , Figure 4 and Figure 7In order to improve the sealing effect of the packaging bag, an auxiliary mechanism 8 is installed at the sealing mechanism 3. The attachment mechanism includes a movable cover 81 and a guide plate 82. The guide plate 82 is fixedly installed on the inner top of the gantry 31, and two guide plates 82 are arranged at intervals along the width direction of the frame 1. Both guide plates 82 pass through the sealing frame 32 and slide with the sealing frame 32. The upper and lower ends of the movable cover 81 are open, and the top of the movable cover 81 is fixed to the lower end of the sealing frame 32. The avoidance groove 55 is formed on the inner and outer guide rails 5 and located on the first straight section 51. The avoidance groove 55 is located in the middle of the first straight section 51 and corresponds to the sealing mechanism 3. The width of the avoidance groove 55 on the inner guide rail 5 is greater than the width of the avoidance groove 55 on the outer guide rail 5, and the width of the two avoidance grooves 55 is greater than the width of the movable cover 81, which can allow the movable cover 81 to move down and be inserted into the first straight section 51. In addition, the groove walls of the two avoidance grooves 55 are both hinged with connecting sections 551, and the hinge shaft of the connecting section 551 is provided with a torsion spring that keeps the connecting section 551 and the first straight section 51 straight and in the same straight line. The bottom of the guide plate 82 is located in the avoidance groove 55 of the outer guide rail 5, and the bottom of the guide plate 82 is flush with the end surface of the outer guide rail 5 close to the inner guide rail 5. Without the action of external force, the ends of the two connecting sections 551 located on the outer guide rail 5 are respectively spliced ​​on both sides of the guide plate 82. The ends of the two connecting sections 551 located on the inner guide rail 5 abut against each other, so that the guide roller 427 can stably slide in the first straight section 51, and can slide from one side of the avoidance groove 55 to the other side of the avoidance groove 55. When the guide roller 427 moves to the bottom of the guide plate 82, it slides with the bottom of the guide plate 82. By driving the sealing frame 32 to descend, the movable cover 81 can be driven to descend, so that the bottom of the movable cover 81 contacts the joint of the connecting section 551, and the connecting section 551 is pressed to rotate with the groove wall of the avoidance groove 55, so that the movable cover 81 can pass through the avoidance groove 55 and contact the transmission plate 212. When the packaging bag on the transmission plate 212 is located in the movable cover 81, a receiving cavity is formed between the movable cover 81, the sealing frame 32 and the transmission plate 212. A vacuum pump 83 is fixedly installed above the frame 1, and an elastic hose 84 is connected to the port of the vacuum pump 83. One side of the movable cover 81 is connected to an air inlet and an air outlet, and valves are installed at the air inlet and the air outlet, and one end of the elastic hose 84 is connected to the air outlet. When the movable cover 81 moves to the highest and lowest positions, the elastic hose 84 is in a relaxed state, that is, the length of the elastic hose 84 is greater than the maximum distance of the movable cover 81, and does not hinder the movement of the movable cover 81. When the movable cover 81 is placed on the outside of the packaging bag to be sealed, that is, the packaging bag is located in the receiving cavity, the pneumatic vacuum pump 83 is used to evacuate the receiving cavity, so that the air in the receiving space and the packaging bag form a slightly vacuum state, which is convenient for sealing. When evacuating, the valve of the air outlet is opened and the valve of the air inlet is closed.After vacuuming and sealing, the valve of the air outlet is closed and the valve of the air inlet is opened, so that the outside air enters the containing cavity, which facilitates the movable cover 81 to move upward. In order to provide support force for the transmission plate 212 at the sealing position, a support plate is fixed on the frame 1 and located below the transmission plate 212. The transmission plate 212 at the first straight section 51 is slidably matched with the support plate, and the support plate is arranged along the length direction of the frame 1. The length of the support plate is less than the length of the first straight section 51, and does not affect the rotation of the conveyor belt 21.

[0030] The working principle of the embodiment of the present application is: by introducing the unsealed packaging bag from the feed rack 6 to the conveying mechanism 2, and clamping and positioning the side and bottom edges of the packaging bag by the clamping mechanism 4 on the conveying mechanism 2, the unsealed packaging bag is continued to be transported to the sealing mechanism 3 for sealing. After sealing, when the sealed packaging bag moves to the discharge rack 7, the clamping mechanism 4 releases the clamping of the packaging bag, and then transports it to the discharge rack 7 at the end of the frame 1 for collection.

[0031] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

[0032] What has been described above is only a preferred specific implementation manner of the embodiments of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can make equivalent substitutions or changes according to the technical scheme and concept of the present application within the technical scope disclosed in the present application, which should be covered by the protection scope of the present application.

Claims

1. A plastic packaging sealing device, comprising a frame (1), a transmission mechanism (2), and a sealing mechanism (3), wherein the transmission mechanism (2) comprises a transmission belt (21) rotatably arranged on the frame (1), characterized in that: The frame (1) is provided with a clamping mechanism (4), the clamping mechanism (4) comprising two clamping plates (41) hinged on the conveyor belt (21) and arranged opposite to each other, the clamping plates (41) comprising a transverse plate (411) hinged to the upper surface of the conveyor belt (21), and two vertical plates (412) respectively arranged perpendicularly at both ends of the transverse plate (411), the bottoms of the transverse plates (411) of the two clamping plates (41) are connected by a same hinge axis, the transverse plates (411) of the two clamping plates (41) are attached to and clamp the bottom of the packaging bag, and the vertical plates (412) of the two clamping plates (41) are attached to and clamp the two sides of the packaging bag, and the conveyor belt (21) is provided with a driving component (42) for driving the two clamping plates (41) to attach to each other.

2. A plastic packaging sealing device as claimed in claim 1, characterized in that: The conveyor belt (21) comprises chains (211) rotatably arranged on two inner sides of the frame (1), and transmission plates (212) respectively hinged to the two chains (211) at two ends, wherein a plurality of the transmission plates (212) are arranged at intervals along the chains (211), and each of the transmission plates (212) is provided with a clamping mechanism (4).

3. A plastic packaging sealing device as claimed in claim 1, characterized in that: The driving assembly (42) comprises a limiting column (421) arranged on one side of the vertical plate (412), a fixing rod (422) arranged vertically on the conveyor belt (21), a slide seat (423) slidably arranged on the fixing rod (422), a limiting plate (424) arranged on one side of the slide seat (423), and a limiting spring (425) sleeved on the fixing rod (422) and connecting the conveyor belt (21) and the slide seat (423); the limiting plate (424) is provided with two arc holes (426) distributed in an "eight" shape; two limiting columns (421) located on one side of the conveyor belt (21) are slidably arranged in the two arc holes (426), and the frame (1) is provided with an annular guide rail (5) spaced from the conveyor belt (21). ), a guide roller (427) slidably connected to the guide rail (5) is provided on the other side of the slide seat (423), the conveyor belt (21) comprises an upper straight section (24), a lower straight section (25), and an end arc section (26) connecting the upper straight section and the lower straight section (25); when the guide roller (427) is slidably connected to the guide rail (5) at a position corresponding to the upper straight section (24), the limiting column (421) slides at the upper end of the arc hole (426) and causes the two clamps (41) to close; when the guide roller (427) is slidably connected to the guide rail (5) at a position corresponding to the lower straight section (25), the limiting column (421) slides at the lower end of the arc hole (426) and causes the two clamps (41) to open.

4. A plastic packaging sealing device as claimed in claim 3, characterized in that: The guide rail (5) comprises a first straight section (51), a second straight section (52), an arc section (53) and a transition section (54); the first straight section (51) corresponds to the upper straight section (24) and the length of the first straight section (51) is shorter than that of the upper straight section (24); the second straight section (52) corresponds to the lower straight section (25); the two arc sections (53) correspond to two end circular arc sections (26) respectively and are concentric; one end of the arc section (53) is smoothly connected to the second straight section (52) and the other end is smoothly connected to the transition section (54); the spacing between the first straight section (51) and the upper straight section (24) of the conveyor belt (21) is shorter than the spacing between the second straight section (52) and the lower straight section (25) of the conveyor belt (21).

5. A plastic packaging sealing device as claimed in claim 1, characterized in that: The sealing mechanism (3) comprises a gantry (31) arranged on the frame (1) and located in the middle of the conveyor belt (21), a sealing frame (32) slidably arranged below the gantry (31), two connecting components (33) respectively arranged below the sealing frame (32) at intervals, and an electric heating clamp (34) arranged on the connecting component (33), wherein the two electric heating clamps (34) are arranged at intervals along the conveying direction of the conveyor belt (21), and the sealing frame (32) is provided with a brake component (35) for driving the two electric heating clamps (34) to open or close.

6. A plastic packaging sealing device as claimed in claim 5, characterized in that: The connecting assembly (33) comprises a support rod (331) arranged below the sealing frame (32) and a connecting rod (332) hinged to the support rod (331); two support rods (331) are arranged at intervals in a direction perpendicular to the transmission direction; two parallel connecting rods (332) are hinged to each support rod (331); the two connecting rods (332) on each support rod (331) are hinged to the back side of a movable plate; the electric heating clip (34) is fixed to the other side of the movable plate, and the two electric heating clips (34) are arranged opposite to each other.

7. A plastic packaging sealing device as claimed in claim 6, characterized in that: The brake assembly (35) comprises a brake cylinder (351) arranged on the sealing frame (32), and a brake rod (352) hinged to the upper end surface of the movable plate and located in the middle, the piston rod end of the brake cylinder (351) passes through the sealing frame (32) and slidably cooperates with the sealing frame (32), and the two brake rods (352) are hinged to the piston rod ends of the brake cylinder (351).

8. A plastic packaging sealing device as claimed in claim 2, characterized in that: The transmission mechanism (2) comprises a transmission motor (22) arranged on one side of the frame (1), and a sprocket (23) rotatably arranged in the frame (1), two sprockets (23) are arranged at intervals along the length direction of the frame (1), and the chain (211) is sleeved on the two sprockets (23).

9. A plastic packaging sealing device as claimed in claim 1, characterized in that: A feed rack (6) is provided on the frame (1) and at the input end of the conveyor belt (21). The feed rack (6) is inclined from bottom to top in a direction away from the conveyor belt (21). The lower end of the feed rack (6) is located below the clamping plate (41) near the connection between the arc section (53) and the transition section (54). The lower end of the feed rack (6) is spaced from the inner side of the clamping plate (41) and can pass through the clamping plate (41).

10. A plastic packaging sealing device as claimed in claim 1, characterized in that: A discharging rack (7) is arranged on the frame (1) and at the output end of the conveyor belt (21). The discharging rack (7) is arranged to be inclined from bottom to top toward a side close to the conveyor belt (21). The high end of the discharging rack (7) is located below the clamping plate (41) in the middle of the arc segment (53). The high end of the discharging rack (7) is arranged to be spaced from the inner side of the clamping plate (41) and can pass through the clamping plate (41).

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