An automatic plastic bag sealing and cutting device and its working method

Abstract

The present invention relates to the technical field of automatic packaging, and discloses an automatic plastic bag sealing and cutting device and its working method, including a sealing upper plate, a sealing lower plate, a sealing and cutting mechanism, a material pressing mechanism, a horizontal plate, a fixing plate, a motor, a support plate and a support rod. In the present invention, when the sealing upper plate moves downward for sealing and cutting, the plastic bag is pulled to the left. The part of the plastic bag that sinks at the load-bearing strip position generates an upward pulling force, causing the smooth rod to be stressed and drive the rotating plate to rotate on the rotating rod, and under the elastic force of the spring, an elastic tilting movement is performed for the plastic bag, providing an elastic stretching space for the plastic bag, preventing the plastic bag from being pulled too fixedly when the sealing lower plate performs sealing and cutting, and avoiding pulling the plastic bag away from the elastic mechanism.

Description

Technical Field

[0001] The present invention relates to the technical field of automatic packaging, and specifically relates to an automatic plastic bag sealing and cutting device and its working method. Background Art

[0002] After the plastic bag is folded, it needs to be packed into a packaging bag. The two ends of the packaging bag are in an open state, and the packaging bag needs to be sealed and cut. After the packaging bag is pulled out by winding to a predetermined position, one side opening of the packaging bag is sealed and cut by a sealing and cutting device. When sealing and cutting, the packaging bag needs to be fixed to prevent the rolled material after sealing and cutting from returning, so as to facilitate pulling out the rolled material for sealing and cutting to form a packaging bag next time. However, a groove will be formed during sealing and cutting, so that pressing will drive the packaging bag again, easily causing the problem of pulling between the fixed packaging bag and the acting force of sealing and cutting, affecting the sealing and cutting and fixing effects of the packaging bag. Summary of the Invention

[0003] The present invention provides an automatic plastic bag sealing and cutting device and its working method, which overcomes the deficiencies described in the background art.

[0004] The technical solution adopted by the present invention to solve its technical problems is as follows:

[0005] An automatic plastic bag sealing and cutting device includes a sealing upper plate, a sealing lower plate, a sealing and cutting mechanism, a pressing mechanism, a horizontal plate, a fixing plate, a motor, a support plate, and a support rod. The sealing lower plate is arranged on the side of the support plate through the support rod. The support plate is installed on the surface of the fixing plate. The sealing and cutting mechanism is arranged at the upper end of the support plate, and a hydraulic device is provided at the connection between the sealing and cutting mechanism and the support plate. The hydraulic device is driven by an electric signal to drive the sealing and cutting mechanism to move up and down telescopically. The sealing upper plate is correspondingly arranged above the sealing lower plate on the side of the sealing and cutting mechanism. The pressing mechanism is arranged on the right side of the sealing and cutting mechanism and is perpendicular to the surface of the horizontal plate. The motor is arranged on the surface of the sealing and cutting mechanism and is driven by an electric signal to cut.

[0006] The sealing and cutting mechanism is provided with a limiting block, a bag-cutting flying knife, a connecting plate, a rail, a fixing seat, and a belt. The fixing seats are symmetrically arranged on the surface of the connecting plate. Rollers are provided on the sides of the two fixing seats to limit the transmission of the belt. The motor is fixed on one of the fixing seats, and the output end of the motor drives the roller on the fixing seat to drive the belt. The limiting block moves left and right on the rail on the surface of the connecting plate, and the belt drives the bag-cutting flying knife on the limiting block to translate and cut.

[0007] The blanking mechanism is provided with an elastic plate, a force-receiving block, a load-bearing bar, a cylinder, an elastic mechanism and a telescopic rod. The cylinder is arranged inside the connecting plate, and the telescopic rod is located at the output end of the cylinder. An electric signal drives the cylinder to expand and contract the telescopic rod, and the force-receiving block at the lower end of the telescopic rod presses the load-bearing bar. The elastic mechanism is arranged at the lower end of the force-receiving block, and the elastic mechanism abuts against the elastic plate on the surface of the load-bearing bar. The elastic mechanism presses the packaging bag downward and elastically moves the left side of the packaging bag through the elastic mechanism.

[0008] A preferred technical solution: The elastic mechanism is provided with a smooth rod, a movable plate, a rotating plate, a limiting rod, a rotating rod, a spring and a roller. The smooth rod is arranged on the left side of the rotating plate. The rotating plate and the movable plate are arranged in a rotating plate within the rotating rod at an obtuse angle. The roller is arranged at both ends of the rotating rod. The limiting rod is arranged at the upper end of the movable plate, and the limiting rod rotates at the lower end of the force-receiving block. Both ends of the spring are respectively connected to the side surfaces of the movable plate and the rotating plate. The lower end of the roller presses the packaging bag against the surface of the elastic plate. When the packaging bag is sealed and cut, the left side of the packaging bag pulls the smooth rod, and the rotating plate elastically rotates on the rotating rod through the spring.

[0009] A preferred technical solution: When the limiting rod is in a static state, the movable plate at the lower end of the limiting rod inclines 15° to the left, and when the movable plate at the lower end of the limiting rod is pressed downward, the movable plate rotates 15° to the left with the limiting rod as the center. The rotating plate is in a horizontal state when the spring is static. When the force-receiving block presses downward, the rotating rod is inclined to the upper left corner position on the surface of the load-bearing bar.

[0010] A preferred technical solution: The limiting rod is divided into an inner tube and an outer tube. The inner tube is fixed inside the force-receiving block, and the outer tube is connected to the upper end of the movable plate. The rotation angle between the outer tube and the inner tube is 15°.

[0011] A preferred technical solution: The load-bearing bar is arranged on the surface of the horizontal plate. The packaging bag passes horizontally from the surface of the load-bearing bar, and the load-bearing bar is arranged at the corresponding position below the force-receiving block.

[0012] A preferred technical solution: The elastic plate is made of rubber material. When the roller drives the packaging bag to press against the surface of the elastic plate, it has the effect of increasing the friction force. And the roller rolls on the surface of the elastic plate through the downward pressing force of the movable plate, which has the effect of increasing the fixing force of the roller on the packaging bag.

[0013] A preferred technical solution: The upper sealing plate is provided with a hollow groove, a hot melt strip, a splicing plate and a hot melt device. An electric signal drives the hot melt device inside the splicing plate and heats the "U"-shaped hot melt strip at the lower end of the hot melt device, so that the hot melt strip presses the packaging bag on the surface of the lower sealing plate when the splicing plate descends. The hollow groove is arranged inside the splicing plate. The splicing plate is fixed on the side surface of the connecting plate. The cutting bag flying knife moves left and right in the hollow groove and cuts the packaging bag below.

[0014] A preferred technical solution: The lower sealing plate is provided with a groove corresponding to the hot melt strip, and a concave groove is provided on the surface of the lower sealing plate directly below the hollow groove. After the hot melt strip melts and seals the packaging bag at the groove position of the lower sealing plate, the bag cutting flying knife moves in the hollow groove and cuts the packaging bag at the concave groove position on the surface of the lower sealing plate.

[0015] A preferred technical solution: The upper surface of the lower sealing plate and the load-bearing strip are on the same horizontal line. When the hot melt strip is pressed downward, the packaging bag is pulled to move on the surfaces of the lower sealing plate and the load-bearing strip.

[0016] Based on the working method of the above-mentioned plastic bag automatic sealing and cutting device, the working method includes the following specific steps:

[0017] S1: The packaging bag passes over the surface of the horizontal plate and passes through the hollow position below the sealing and cutting mechanism. The packaging bag passes over the surface of the lower sealing plate. After the packaging bag is stretched and stationary, the cylinder in the pressing mechanism is electrically signaled to drive the telescopic rod to compress downward, so that the elastic mechanism at the lower end of the force-bearing block presses the packaging bag passing over the surface of the load-bearing strip.

[0018] S2: After the packaging bag is fixed by the pressing mechanism, the electric signal drives the hydraulic device to lift and lower the sealing and cutting mechanism, so that the upper sealing plate seals and cuts the packaging bag passing through the position of the lower sealing plate below.

[0019] S3: After the sealing and cutting is completed, the electric signal drives the motor, so that the output end of the motor drives the roller on the fixed seat to drive the belt strip. Then the belt strip drives the limit block to slide linearly on the rail strip, so that the bag cutting flying knife moves left and right to cut the packaging bag below the upper sealing plate. After the cutting is completed, the electric signal drives the hydraulic device and the motor to reset.

[0020] S4: When the upper sealing plate seals and cuts the packaging bag, it drives the packaging bag to move downward and pulls the packaging bag at the left convex part of the elastic plate. Then the packaging bag squeezes the rotating plate upward outside the smooth rod, so that the rotating plate rotates under the elastic force of the spring. Through the elastic rotation of the rotating plate, the straight-line distance from the elastic plate to the rotating rod makes the rotating plate generate a bend on the packaging bag through the elasticity of the spring.

[0021] Compared with the prior art, this technical solution has the following advantages:

[0022] In the present invention, when the upper sealing plate seals and cuts downward, it pulls the packaging bag to the left. At this time, the part of the packaging bag that sinks at the load-bearing strip position generates an upward pulling force, so that the smooth rod is stressed and drives the rotating plate to rotate on the rotating rod, and under the elastic force of the spring, it performs an elastic tilting activity for the packaging bag, providing an elastic stretching space for the packaging bag, preventing the packaging bag from being pulled too fixedly when the lower sealing plate seals and cuts, and avoiding pulling the packaging bag out of the elastic mechanism.

[0023] In the present invention, an electric signal drives a hot melt device to heat a hot melt strip, which in turn heats a packaging bag to a gelatinous state to achieve a sealing effect. After the heating is completed, a bag-cutting flying knife moves left and right within a hollow groove in a splicing plate and cuts the packaging bag at the position of a concave groove on the surface of a lower sealing plate, realizing an automatic sealing and cutting effect for the packaging bag. The "U"-shaped hot melt strip is limited by the groove on the surface of the lower sealing plate to prevent the heating position from being disconnected by the tensile force of the packaging bag due to weak fixing force during the heating of the packaging bag. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described below in conjunction with the drawings and embodiments.

[0025] Figure 1 It is the overall view of the present invention.

[0026] Figure 2 It is a three-dimensional schematic diagram of a sealing and cutting mechanism.

[0027] Figure 3 It is a side view of a material pressing mechanism.

[0028] Figure 4 It is a three-dimensional schematic diagram of an elastic mechanism.

[0029] Figure 5 It is a side view of an upper sealing plate.

[0030] Figure 6 It is a three-dimensional schematic diagram of a limiting rod.

[0031] In the figure: upper sealing plate - 1, lower sealing plate - 2, sealing and cutting mechanism - 3, material pressing mechanism - 4, horizontal plate - 5, fixing plate - 6, motor - 7, support plate - 8, support rod - 9.

[0032] limiting block - 31, bag-cutting flying knife - 32, connecting plate - 33, rail - 34, fixing seat - 35, belt strip - 36.

[0033] elastic plate - 41, force-receiving block - 42, load-bearing strip - 43, air cylinder - 44, elastic mechanism - 45, telescopic rod - 46.

[0034] smooth rod - 451, movable plate - 452, rotating plate - 453, limiting rod - 454, rotating rod - 455, spring - 456, roller - 457.

[0035] hollow groove - 11, hot melt strip - 12, splicing plate - 13, hot melt device - 14. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] As Figures 1 to 6As shown, an automatic plastic bag sealing and cutting device is proposed in the present invention, which includes a sealing upper plate 1, a sealing lower plate 2, a sealing and cutting mechanism 3, a material pressing mechanism 4, a horizontal plate 5, a fixing plate 6, a motor 7, a support plate 8 and a support rod 9. The sealing lower plate 2 is arranged on the side of the support plate 8 through the support rod 9. The support plate 8 is installed on the surface of the fixing plate 6. The sealing and cutting mechanism 3 is arranged at the upper end of the support plate 8, and a hydraulic device is provided at the connection between the sealing and cutting mechanism 3 and the support plate 8. The hydraulic device is driven by an electric signal to drive the sealing and cutting mechanism 3 to move up and down. The sealing upper plate 1 is correspondingly arranged above the sealing lower plate 2 on the side of the sealing and cutting mechanism 3. The material pressing mechanism 4 is arranged on the right side of the sealing and cutting mechanism 3 and is perpendicular to the surface of the horizontal plate 5. The motor 7 is arranged on the surface of the sealing and cutting mechanism 3 and is driven by an electric signal to cut.

[0037] The sealing and cutting mechanism 3 is provided with a limit block 31, a bag-cutting flying knife 32, a connecting plate 33, a rail 34, a fixing seat 35 and a belt 36. The fixing seats 35 are symmetrically arranged on the surface of the connecting plate 33. Rollers are provided on the sides of the two fixing seats 35 for limiting transmission with the belt 36. The motor 7 is fixed on one of the fixing seats 35, and the output end of the motor 7 drives the roller on the fixing seat 35 to drive the belt 36. The limit block 31 moves left and right on the rail 34 on the surface of the connecting plate 33, and the belt 36 drives the bag-cutting flying knife 32 on the limit block 31 to move horizontally for cutting.

[0038] The material pressing mechanism 4 is provided with an elastic plate 41, a force-bearing block 42, a load-bearing bar 43, a cylinder 44, an elastic mechanism 45 and a telescopic rod 46. The cylinder 44 is arranged inside the connecting plate 33, and the telescopic rod 46 is located at the output end of the cylinder 44. The cylinder 44 is driven by an electric signal to expand and contract the telescopic rod 46, and the force-bearing block 42 at the lower end of the telescopic rod 46 presses the load-bearing bar 43. The elastic mechanism 45 is arranged at the lower end of the force-bearing block 42, and the elastic mechanism 45 abuts against the elastic plate 41 on the surface of the load-bearing bar 43. The elastic mechanism 45 presses the packaging bag downward and elastically moves the left side of the packaging bag through the elastic mechanism 45.

[0039] In the present invention, the packaging bag is horizontally pulled from the load-bearing strip 43 on the surface of the horizontal plate 5. After the pulling is completed, an electric signal drives the air cylinder 44 to press and fix the packaging bag on the surface of the load-bearing strip 43. When pressing and fixing, the elastic mechanism 45 presses the packaging bag so that the packaging bag sinks into the surface of the elastic plate 41 in the middle of the load-bearing strip 43, and the elastic mechanism 45 rolls on the surface of the elastic plate 41 again to strengthen the pressing force. After the pressing is completed, the hydraulic device drives the sealing and cutting mechanism 3 to move up and down, so that the upper sealing plate 1 moves downward to the corresponding lower sealing plate 2 position to seal the packaging bag. After the sealing is completed, an electric signal drives the motor 7, so that the belt strip 36 on the surface of the sealing and cutting mechanism 3 is driven, and then drives the limiting block 31 to move linearly left and right along the upper sealing plate 1 on the rail strip 34. At this time, the bag-cutting flying knife 32 on the side of the limiting block 31 moves accordingly and cuts the packaging bag below the upper sealing plate 1 to form a sealing and cutting effect.

[0040] Among them, the elastic mechanism 45 is provided with a smooth rod 451, a movable plate 452, a rotating plate 453, a limiting rod 454, a rotating rod 455, a spring 456 and a roller 457. The smooth rod 451 is arranged on the left side of the rotating plate 453. The rotating plate 453 and the movable plate 452 are arranged in an obtuse hinge in the rotating rod 455. The roller 457 is arranged at both ends of the rotating rod 455. The limiting rod 454 is arranged at the upper end of the movable plate 452, and the limiting rod 454 rotates at the lower end of the force-bearing block 42. The two ends of the spring 456 are respectively connected to the sides of the movable plate 452 and the rotating plate 453. The lower end of the roller 457 presses the packaging bag on the surface of the elastic plate 41. When the packaging bag is sealed and cut, the left side of the packaging bag pulls the smooth rod 451, and the rotating plate 453 elastically rotates on the rotating rod 455 through the spring 456.

[0041] Moreover, when the limiting rod 454 is in a static state, the movable plate 452 at the lower end of the limiting rod 454 inclines 15° to the left, and when the movable plate 452 at the lower end of the limiting rod 454 is pressed downward, the movable plate 452 rotates 15° to the left with the limiting rod 454 as the center. When the spring 456 is static, the rotating plate 453 is in a horizontal state. When the force-bearing block 42 is pressed downward, the rotating rod 455 is inclined to the upper left corner position on the surface of the load-bearing strip 43.

[0042] Moreover, the limiting rod 454 is divided into an inner tube and an outer tube. The inner tube is fixed inside the force-bearing block 42, and the outer tube is connected to the upper end of the movable plate 452. The rotation angle between the outer tube and the inner tube is 15°.

[0043] Moreover, the load-bearing strip 43 is arranged on the surface of the horizontal plate 5. The packaging bag passes horizontally from the surface of the load-bearing strip 43, and the load-bearing strip 43 is arranged at the corresponding position below the force-bearing block 42.

[0044] Moreover, the elastic plate 41 is made of rubber material. When the roller 457 drives the packaging bag to press against the surface of the elastic plate 41, it has the effect of increasing the friction force. And the downward pressing force of the roller 457 through the movable plate 452 makes the roller 457 roll on the surface of the elastic plate 41, which has the effect of increasing the fixing force of the roller 457 on the packaging bag.

[0045] In the present invention, when the cylinder 44 drives the telescopic rod 46 to press downward, the force-receiving block 42 drives the elastic mechanism 45 to squeeze the packaging bag on the surface of the load-bearing strip 43, and the packaging bag sinks into the middle of the load-bearing strip 43 to form a concave shape. Under the downward pressing force, the roller 457 and the smooth rod 451 pull the packaging bag to rotate the inclined movable plate 452 by 15°, so that the roller 457 rolls on the surface of the elastic plate 41 and increases the pressing force on the packaging bag. And when the upper sealing plate 1 seals and cuts downward, it pulls the packaging bag to the left. At this time, the part of the packaging bag that sinks at the position of the load-bearing strip 43 generates an upward pulling force, causing the smooth rod 451 to drive the rotating plate 453 to rotate on the rotating rod 455, and under the elastic force of the spring 456, it performs an elastic tilting activity for the packaging bag, providing an elastic stretching space for the packaging bag, preventing the lower sealing plate 2 from pulling the overly fixed packaging bag when sealing and cutting, and avoiding pulling the packaging bag away from the elastic mechanism 45.

[0046] Among them, the upper sealing plate 1 is provided with a hollow groove 11, a hot melt strip 12, a splicing plate 13 and a hot melt device 14. The electric signal drives the hot melt device 14 inside the splicing plate 13 and heats the "U"-shaped hot melt strip 12 at the lower end of the hot melt device 14, so that the hot melt strip 12 presses the packaging bag on the surface of the lower sealing plate 2 when the splicing plate 13 descends. The hollow groove 11 is arranged inside the splicing plate 13, the splicing plate 13 is fixed on the side surface of the connecting plate 33, and the bag-cutting flying knife 32 moves left and right in the hollow groove 11 and cuts the packaging bag below.

[0047] Moreover, the lower sealing plate 2 is provided with a groove corresponding to the hot melt strip 12, and a concave groove is provided on the surface of the lower sealing plate 2 directly below the hollow groove 11. After the hot melt strip 12 melts and seals the packaging bag at the groove position of the lower sealing plate 2, the bag-cutting flying knife 32 moves in the hollow groove 11 and cuts the packaging bag at the concave groove position on the surface of the lower sealing plate 2.

[0048] Moreover, the upper surface of the lower sealing plate 2 and the load-bearing strip 43 are on the same horizontal line. When the hot melt strip 12 presses downward, it pulls the packaging bag to move on the surfaces of the lower sealing plate 2 and the load-bearing strip 43.

[0049] In the present invention, after the sealing upper plate 1 presses down the packaging bag on the surface of the sealing lower plate 2, the hot melt strip 12 drives the packaging bag to fall into the groove on the surface of the sealing lower plate 2 for positioning. At the same time, an electrical signal drives the hot melt device 14 to heat the hot melt strip 12, so that the hot melt strip 12 heats the packaging bag to a gelatinous state to form a sealing effect. After the heating is completed, the bag-cutting flying knife 32 moves left and right in the hollow groove 11 in the splicing plate 13, and cuts the packaging bag at the concave groove position on the surface of the sealing lower plate 2, realizing the automatic sealing and cutting effect of the packaging bag. The "U"-shaped hot melt strip 12 limits the position corresponding to the groove on the surface of the sealing lower plate 2, avoiding the heating position being disconnected by the tension of the packaging bag due to the weak fixing force when heating the packaging bag.

[0050] Based on the working method of the above-mentioned automatic plastic bag sealing and cutting device, the working method includes the following specific steps:

[0051] S1: The packaging bag passes over the surface of the horizontal plate 5 and passes through the hollow position below the sealing and cutting mechanism 3. The packaging bag passes over the surface of the sealing lower plate 2. After the packaging bag is stretched and stationary, the cylinder 44 in the pressing mechanism 4 is electrically signaled to drive the telescopic rod 46 to compress downward, so that the elastic mechanism 45 at the lower end of the force-bearing block 42 presses the packaging bag passing over the surface of the load-bearing strip 43.

[0052] S2: After the packaging bag is fixed by the pressing mechanism 4, an electrical signal drives the hydraulic device to lift and lower the sealing and cutting mechanism 3, so that the sealing upper plate 1 performs sealing and cutting on the packaging bag passing downward to the sealing lower plate 2.

[0053] S3: After the sealing and cutting is completed, an electrical signal drives the motor 7, so that the output end of the motor 7 drives the roller on the fixed seat 35 to drive the belt strip 36. Subsequently, the belt strip 36 drives the limit block 31 to slide linearly on the rail strip 34, so that the bag-cutting flying knife 32 moves left and right to cut the packaging bag below the sealing upper plate 1. After the cutting is completed, an electrical signal drives the hydraulic device and the motor 7 to reset.

[0054] S4: When the sealing upper plate 1 seals and cuts the packaging bag, it drives the packaging bag to move downward, and the packaging bag is pulled at the left protrusion of the elastic plate 41. Subsequently, the packaging bag squeezes the rotating plate 453 upward outside the smooth rod 451, so that the rotating plate 453 rotates under the elastic force of the spring 456. Through the elastic rotation of the rotating plate 453, the linear distance from the elastic plate 41 to the rotating rod 455 causes the rotating plate 453 to bend the packaging bag through the elasticity of the spring 456.

[0055] The above is only a preferred embodiment of the present invention, so the scope of implementation of the present invention cannot be limited thereby. That is, equivalent changes and modifications made according to the scope of the present invention patent and the content of the specification should still fall within the scope covered by the present invention.

Claims

1. An automatic plastic bag sealing and cutting device, characterized in that, It includes a sealing upper plate (1), a sealing lower plate (2), a sealing and cutting mechanism (3), a material pressing mechanism (4), a horizontal plate (5), a fixing plate (6), a motor (7), a support plate (8) and a support rod (9). The sealing lower plate (2) is arranged on the side of the support plate (8) through the support rod (9). The support plate (8) is installed on the surface of the fixing plate (6). The sealing and cutting mechanism (3) is arranged at the upper end of the support plate (8), and a hydraulic device is provided at the connection between the sealing and cutting mechanism (3) and the support plate (8). An electric signal drives the hydraulic device to drive the sealing and cutting mechanism (3) to expand and contract up and down. The sealing upper plate (1) is correspondingly arranged above the sealing lower plate (2) on the side of the sealing and cutting mechanism (3). The material pressing mechanism (4) is arranged on the right side of the sealing and cutting mechanism (3), and the material pressing mechanism (4) is perpendicular to the surface of the horizontal plate (5). The motor (7) is arranged on the surface of the sealing and cutting mechanism (3) and is driven by an electric signal to cut; The material pressing mechanism (4) is provided with an elastic plate (41), a force receiving block (42), a load bearing strip (43), a cylinder (44), an elastic mechanism (45) and a telescopic rod (46). The cylinder (44) is arranged inside the connecting plate (33), and the telescopic rod (46) is located at the output end of the cylinder (44). An electric signal drives the cylinder (44) to expand and contract the telescopic rod (46), and makes the force receiving block (42) at the lower end of the telescopic rod (46) press the load bearing strip (43). The elastic mechanism (45) is arranged at the lower end of the force receiving block (42), and the elastic mechanism (45) abuts against the elastic plate (41) on the surface of the load bearing strip (43). The elastic mechanism (45) presses the packaging bag downward and elastically moves the left side of the packaging bag through the elastic mechanism (45); The elastic mechanism (45) is provided with a smooth rod (451), a movable plate (452), a rotating plate (453), a limiting rod (454), a rotating rod (455), a spring (456) and a roller (457). The smooth rod (451) is arranged on the left side of the rotating plate (453). The rotating plate (453) and the movable plate (452) are arranged in an obtuse hinge in the rotating rod (455). The roller (457) is arranged at both ends of the rotating rod (455). The limiting rod (454) is arranged at the upper end of the movable plate (452), and the limiting rod (454) rotates at the lower end of the force receiving block (42). Both ends of the spring (456) are respectively connected to the sides of the movable plate (452) and the rotating plate (453). The lower end of the roller (457) presses the packaging bag on the surface of the elastic plate (41). When the packaging bag is sealed and cut, the left side of the packaging bag pulls the smooth rod (451), and the rotating plate (453) elastically rotates on the rotating rod (455) through the spring (456).

2. The automatic plastic bag sealing and cutting device according to claim 1, wherein, The sealing and cutting mechanism (3) is provided with a limit block (31), a bag-cutting flying knife (32), a connecting plate (33), a rail (34), a fixed seat (35) and a belt strip (36). The fixed seats (35) are symmetrically arranged on the surface of the connecting plate (33). Rollers are arranged on the sides of the two fixed seats (35) for limiting and driving the belt strip (36). The motor (7) is fixed on one of the fixed seats (35). The output end of the motor (7) drives the roller on the fixed seat (35) to drive the belt strip (36). The limit block (31) moves left and right on the rail (34) on the surface of the connecting plate (33), and the belt strip (36) drives the bag-cutting flying knife (32) on the limit block (31) to move horizontally for cutting.

3. The automatic plastic bag sealing and cutting device according to claim 1, characterized in that When the limit rod (454) is in a static state, the movable plate (452) at the lower end of the limit rod (454) inclines 15° to the left. And when the movable plate (452) at the lower end of the limit rod (454) is pressed downward, the movable plate (452) rotates 15° to the left with the limit rod (454) as the center. When the spring (456) is static, the rotating plate (453) is in a horizontal state. When the force-receiving block (42) is pressed downward, the rotating rod (455) is inclined to the upper left corner position on the surface of the force-bearing strip (43).

4. The automatic plastic bag sealing and cutting device according to claim 1, characterized in that, The upper sealing plate (1) is provided with a hollow groove (11), a hot melt strip (12), a splicing plate (13) and a hot melt device (14). The hot melt device (14) inside the splicing plate (13) is driven by an electric signal, and the "U"-shaped hot melt strip (12) at the lower end of the hot melt device (14) is heated, so that the hot melt strip (12) presses the packaging bag on the surface of the lower sealing plate (2) when the splicing plate (13) descends. The hollow groove (11) is arranged inside the splicing plate (13). The splicing plate (13) is fixed on the side of the connecting plate (33). The bag-cutting flying knife (32) moves left and right in the hollow groove (11) to cut the packaging bag below.

5. The automatic plastic bag sealing and cutting device according to claim 4, characterized in that, The lower sealing plate (2) is provided with a groove corresponding to the hot melt strip (12), and a concave groove is arranged on the surface of the lower sealing plate (2) directly below the hollow groove (11). After the hot melt strip (12) melts and seals the packaging bag at the groove position of the lower sealing plate (2) downward, the bag-cutting flying knife (32) moves in the hollow groove (11) to cut the packaging bag at the concave groove position on the surface of the lower sealing plate (2).

6. The automatic plastic bag sealing and cutting device according to claim 5, wherein The upper surface of the lower sealing plate (2) and the force-bearing strip (43) are on the same horizontal line. And when the hot melt strip (12) is pressed downward, the packaging bag is pulled to move on the surfaces of the lower sealing plate (2) and the force-bearing strip (43).

7. The working method of an automatic plastic bag sealing and cutting device according to claim 2 above, characterized in that, The working method includes the following specific steps: S1: The packaging bag passes through the surface of the horizontal plate (5) and passes through the hollow position below the sealing and cutting mechanism (3). The packaging bag passes through the surface of the lower sealing plate (2). After the packaging bag is stretched and static, the cylinder (44) in the pressing mechanism (4) is driven by an electric signal to compress the telescopic rod (46) downward, so that the elastic mechanism (45) at the lower end of the force-receiving block (42) presses the packaging bag passing through the surface of the force-bearing strip (43). S2: After the packaging bag is fixed by the material pressing mechanism (4), an electric signal drives the hydraulic actuator to lift the sealing and cutting mechanism (3), so that the upper sealing plate (1) seals and cuts the packaging bag passing through the position of the lower sealing plate (2) below; S3: After the sealing and cutting are completed, an electric signal drives the motor (7), so that the output end of the motor (7) drives the roller on the fixed seat (35) to drive the belt strip (36). Subsequently, the belt strip (36) drives the limit block (31) to linearly slide on the rail (34), so that the bag-cutting flying knife (32) moves left and right to cut the packaging bag below the upper sealing plate (1). After the cutting is completed, an electric signal drives the hydraulic actuator and the motor (7) to reset; S4: When the upper sealing plate (1) seals and cuts the packaging bag, it drives the packaging bag to move downward and pulls the packaging bag at the left protrusion of the elastic plate (41). Subsequently, the packaging bag squeezes the rotating plate (453) upward outside the smooth rod (451), so that the rotating plate (453) rotates under the elastic force of the spring (456).

Images