A synchronous heat-sealing device and method for a medical packaging bag

Abstract

A synchronous heat-sealing device and method for a medical packaging bag, including a frame. Sealing devices are respectively installed on two support rods at the upper and lower ends. The two ends of the support rods are slidably connected to the frame up and down. Rotating shafts are respectively arranged below the two support rods at the lower end of the frame. The rotating shafts are fixedly connected to the central holes of the rotating blocks. One end of the rotating block is rotatably connected to the extension shaft of the upper support rod through a first connecting rod, and the other end is rotatably connected to the extension shaft of the lower support rod through a second connecting rod. A gear is installed on the rotating shaft, and a driving device drives the gear to rotate forward and backward to drive the two upper support rods and the two lower support rods to move synchronously to open and close. Through the above structure, the upper and lower sealing devices can open and close synchronously, and when the upper and lower sealing devices are closed, they are always at the same height as the film on the production line. Thus, there is no scratching between the film on the production line and the heat-sealing knife, and the medical packaging bag can be heat-sealed on both sides, improving the strength of the sealing structure.

Description

Technical Field

[0001] The present invention relates to the technical field of medical plastic packaging bags, and particularly to a synchronous heat-sealing device and method for medical packaging bags. Background Art

[0002] When heat-sealing medical plastic packaging bags, the common method is that the packaging bag passes through a fixed plate under the heat-sealing knife, and the heat-sealing knife squeezes the packaging bag on the fixed plate to form a seal. Since the position of the fixed plate is fixed, during the production of the packaging bag, it will cause scratches on the bottom side of the plastic bag, forming scratch marks, which affect the product quality. In addition, when using a single-sided press of the heat-sealing knife for heat-sealing, the sealing strength is poor. To solve the above problems, the inventor intends to perform double-sided heat-sealing on medical packaging bags. However, how to make the upper and lower sealing devices open and close synchronously, and when the upper and lower sealing devices are closed, they are always at the same height as the film on the production line is a problem to be solved. Summary of the Invention

[0003] The technical problem to be solved by the present invention is: to solve the problems existing in the above background art, and provide a synchronous heat-sealing device for medical packaging bags that can make the upper and lower heat-sealing devices open and close synchronously, and when the upper and lower sealing devices are closed, they are always at the same height as the film on the production line. Through this device, there is no scratch between the film on the production line and the heat-sealing knife, and double-sided heat-sealing can be performed on medical packaging bags to improve the sealing structure strength.

[0004] Another technical problem to be solved by the present invention is: to provide a method for synchronous heat-sealing using a synchronous heat-sealing device for medical packaging bags.

[0005] To achieve the above technical features, the object of the present invention is realized as follows: A synchronous heat-sealing device for medical packaging bags includes a frame. Two support rods are respectively installed at the upper and lower inner sides of the frame. Sealing devices for sealing medical packaging bags are respectively installed on the two support rods at the upper and lower ends. The sealing devices installed on the two support rods at the upper end are opposite in direction to the sealing devices installed on the two support rods at the lower end; both ends of the support rods are slidably connected to the frame up and down. The frame is provided with longitudinal long holes at both ends of the support rods, and both ends of the support rods are provided with extension shafts extending out of the long holes; the frame is respectively provided with rotating shafts below the two support rods at the lower end. Both ends of the rotating shafts are rotatably connected to the frame and extend out of the frame. Rotating blocks are fixedly installed at both ends of the rotating shafts; the rotating shafts are fixedly connected to the central holes of the rotating blocks. One end of the rotating block is rotatably connected to the extension shaft of the upper support rod through a first connecting rod, and the other end is rotatably connected to the extension shaft of the lower support rod through a second connecting rod; a gear is installed on the rotating shaft, and a driving device drives the gear to rotate forward and backward to drive the two support rods at the upper end and the two support rods at the lower end to open and close synchronously.

[0006] On the inner side of the frame, two opposite sliding grooves are fixedly installed on both sides of the long hole, and rectangular sliders are respectively provided at both ends of the support rod and slidably clamped in the two opposite sliding grooves.

[0007] The sealing device includes a bottom plate respectively connected to the two support rods at the upper end and the two support rods at the lower end. A buffer cylinder is installed on the bottom plate, and a heat sealing knife is installed on the piston rod of the buffer cylinder.

[0008] On the opposite sides of the two support rods at the upper end and the two support rods at the lower end, there are slide rails. Sliders are installed at both ends of the bottom plate of the sealing device connected to the support rods, and the sliders are installed in cooperation with the slide rails; The sealing devices on the two support rods at the upper end and the two support rods at the lower end are connected by a positioning rod. The positioning rod is fixed to one side of the sealing device and slidably connected to the other side of the sealing device; The sealing device on the two support rods at the upper end is provided with an adjusting device for adjusting the position.

[0009] The adjusting device includes a fixing plate horizontally installed on the two support rods at the upper end, and a screw seat fixedly installed on the bottom plate. One end of the screw rod is rotatably connected to the fixing plate, and the other end is in threaded rotational connection with the screw seat. The end connected to the fixing plate extends outwards, and a handwheel is installed at the end.

[0010] The driving device includes a rack meshed with a gear. One end of the rack is connected to the piston rod of the cylinder, and the cylinder is fixedly connected to the support installed on the frame; A guiding groove block is provided at the bottom of the rack.

[0011] Support bearing seats are installed on the rotating shafts on one side or both sides of the gear and connected to the frame.

[0012] A synchronous heat sealing method using a synchronous heat sealing device for a medical packaging bag includes the following steps:

[0013] S1. Pass the film for producing medical packaging bags through the sealing devices respectively installed between the two support rods at the upper end and the two support rods at the lower end;

[0014] S2. When the film for producing medical packaging bags moves on the production line and reaches the preset sealing position, the production line stops; The piston rod of the cylinder retracts, pulling the rack. The rack drives the gear to rotate clockwise, thereby driving the rotating block to swing clockwise. One end of the rotating block pulls the first connecting rod downward, and the first connecting rod pulls the support rod at the upper end downward. At the same time, the other end of the rotating block pushes the second connecting rod upward, and the second connecting rod pushes the support rod at the lower end upward, so that the sealing devices respectively installed on the two support rods at the upper end and the lower end move towards each other and approach, and perform two-way synchronous heat sealing on the medical packaging bag;

[0015] S3. After heat sealing is completed, the piston rod of the cylinder extends, pushing the rack. The rack drives the gear to rotate counterclockwise, thereby driving the rotating block to swing counterclockwise. One end of the rotating block pushes the first connecting rod upward, and the first connecting rod pushes the upper support rod upward. At the same time, the other end of the rotating block pulls the second connecting rod downward, and the second connecting rod pulls the lower support rod downward, so that the sealing devices installed on the upper and lower support rods move in opposite directions and separate.

[0016] S4. The production line starts, waits for the next preset sealing position, and repeats steps S2 - S3.

[0017] Between S1 and S2, there is also a step of adjusting the positions of the two opposite sealing devices at the upper and lower ends.

[0018] Before S1, there is also a step of adjusting the sealing height of the sealing devices installed on the two upper support rods and the two lower support rods respectively in the closed state.

[0019] The present invention has the following beneficial effects:

[0020] 1. One end of the rotating block is rotationally connected to the upper support rod through the first connecting rod, and the other end is rotationally connected to the lower support rod through the second connecting rod. The upper and lower sealing devices can open and close synchronously, and when the upper and lower sealing devices are closed, they are always at the same height as the film on the production line, so that there is no scratching between the film on the production line and the heat sealing knife, and double - side heat sealing can be performed on the medical packaging bag, improving the sealing structure strength.

[0021] 2. Rectangular sliders are respectively provided at both ends of the support rod and slide - fit in two opposite sliding grooves. Through the cooperation of the rectangular sliders and the two opposite sliding grooves, the structure is simple, enabling the support rod to slide up and down while restricting the rotation of the support rod.

[0022] 3. Sliding rails are provided on the opposite sides of the two upper support rods and the two lower support rods. Sliders are installed at both ends of the bottom plate of the sealing device connected to the support rod. The sealing devices on the two upper support rods are provided with adjustment devices for adjusting the position, which can adjust the position of the sealing device, and the upper sealing device and the lower sealing device are synchronously adjusted and moved through the positioning rod.

[0023] 4. The reciprocating motion of the rack is driven by a cylinder. The structure is simple and easy to use. The reciprocating distance can be controlled by customizing the stroke of the cylinder, avoiding the cumbersome control program of using a motor drive. Description of the Drawings

[0024] Figure 1 It is a three - dimensional structure schematic diagram of the present invention.

[0025] Figure 2 is Figure 1Schematic diagram of the enlarged structure at A in the [Chinese context].

[0026] Figure 3 Schematic diagram of the front view structure of the present invention.

[0027] Figure 4 Schematic diagram of the left view structure of the present invention.

[0028] Figure 5 Schematic diagram of the three-dimensional structure of another perspective of the present invention.

[0029] Figure 6 Schematic diagram of the adjustment device structure of the present invention.

[0030] In the figure: frame 10, long hole 11, chute 12, roller 13, support rod 21, rectangular slider 211, extension shaft 212, slide rail 213, sealing device 22, bottom plate 221, buffer cylinder 222, heat sealing knife 223, slider 224, positioning rod 23, adjustment device 24, fixing plate 241, screw seat 242, lead screw 243, hand wheel 244, rotating block 31, first connecting rod 32, second connecting rod 33, rotating shaft 34, gear 35, support bearing seat 36; drive device 40, rack 41, guide groove block 42, support 43, cylinder 44. Specific embodiments

[0031] The following further describes the embodiments of the present invention with reference to the accompanying drawings.

[0032] Embodiment 1:

[0033] Refer to Figures 1-6, A synchronous heat-sealing device for a medical packaging bag, comprising a frame 10. Two support rods 21 are respectively installed at the upper and lower ends inside the frame 10. Sealing devices 22 for sealing the medical packaging bag are respectively installed on the two support rods 21 at the upper and lower ends. The sealing devices 22 installed on the two support rods 21 at the upper end are opposite in direction to the sealing devices 22 installed on the two support rods 21 at the lower end. Both ends of the support rod 21 are slidably connected to the upper and lower parts of the frame 10. The frame 10 is provided with longitudinal long holes 11 at both ends of the support rod 21. Both ends of the support rod 21 are provided with extension shafts 212 extending outwards beyond the long holes 11. Rotating shafts 34 are respectively provided below the two support rods 21 at the lower end of the frame 10. Both ends of the rotating shaft 34 are rotatably connected to the frame 10 and extend out of the frame 10. Rotating blocks 31 are fixedly installed at both ends of the rotating shaft 34. The rotating shaft 34 is fixedly connected to the central hole of the rotating block 31. One end of the rotating block 31 is rotatably connected to the extension shaft 212 of the upper support rod 21 through a first connecting rod 32, and the other end is rotatably connected to the extension shaft 212 of the lower support rod 21 through a second connecting rod 33. A gear 35 is installed on the rotating shaft 34. The driving device 40 drives the gear 35 to rotate forward and backward to drive the two support rods 21 at the upper end and the two support rods 21 at the lower end to move synchronously in opening and closing. The driving device 40 can be a linear motion cylinder or oil cylinder, or a stepping motor or servo motor.

[0034] During use, the driving device 40 drives the gear 35 to rotate reciprocally, thereby driving the rotating shaft 34 to rotate, thereby driving the rotating block 31 to swing. Refer to Figure 4 , when the rotating block 31 swings clockwise, one end of the rotating block 31 pulls the first connecting rod 32 downward, the first connecting rod 32 pulls the upper support rod 21 downward, and at the same time the other end of the rotating block 31 pushes the second connecting rod 33 upward, the second connecting rod 33 pushes the lower support rod 21 upward, so that the sealing devices 22 respectively installed on the two support rods 21 at the upper and lower ends move towards each other and close to perform heat-sealing on the medical packaging bag. After the heat-sealing is completed, the driving device 40 drives the gear 35 to rotate counterclockwise. One end of the rotating block 31 pushes the first connecting rod 32 upward, the first connecting rod 32 pushes the upper support rod 21 upward, and at the same time the other end of the rotating block 31 pulls the second connecting rod 33 downward, the second connecting rod 33 pulls the lower support rod 21 downward, so that the sealing devices 22 respectively installed on the two support rods 21 at the upper and lower ends move in the opposite direction and separate to facilitate the passage of the film of the plastic bag for processing. In order to facilitate the adjustment of the height when closing, the first connecting rod 32 and the second connecting rod 33 adopt an adjustable structure of a double-headed lead screw.

[0035] Through the above structure, the upper and lower sealing devices can open and close synchronously, and when the upper and lower sealing devices are closed, they are always at the same height as the film on the production line. Thus, there is no scratching between the film on the production line and the heat-sealing knife, and double-sided heat-sealing can be performed on the medical packaging bag, improving the strength of the sealing structure.

[0036] In a preferred embodiment, referring to Figure 2 , on the inner side of the frame 10, two opposite sliding grooves 12 are fixedly installed on both sides of the long hole 11, and rectangular sliders 211 are respectively provided at both ends of the support rod 21 and are slidably clamped in the two opposite sliding grooves 12. Through the cooperation of the rectangular slider 211 and the two opposite sliding grooves 12, the structure is simple, enabling the support rod 21 to slide up and down while restricting the rotation of the support rod 21.

[0037] In a preferred embodiment, referring to Figure 3 , the sealing device 22 includes a bottom plate 221 respectively connected to the two support rods 21 at the upper end and the two support rods 21 at the lower end. A buffer cylinder 222 is installed on the bottom plate 221, and a heat sealing knife 223 is installed on the piston rod of the buffer cylinder 222. The sealing device 22 can be a linear type perpendicular to the running direction of the packaging bag (not shown in the figure) for transversely sealing the medical packaging bag; referring to Figure 3 , or it can be an inclined type at a certain angle to the running direction of the packaging bag for sealing the packaging bag at an angle. The sealing device 22 can be installed one on each of the upper and lower sides, or two or more can be installed on each of the upper and lower sides. The buffer cylinder 222 is used to buffer the pressure when the upper and lower sealing devices 22 come into contact. Of course, in order to ensure that the angles of the upper and lower heat sealing knives 223 are consistent when approaching, a guiding device can also be installed on the bottom plate 221 and connected to the heat sealing knife 223.

[0038] To facilitate adjusting the position of the sealing device 22 on the production line, referring to Figure 1 、 3 , sliding rails 213 are provided on the opposite sides of the two support rods 21 at the upper end and the two support rods 21 at the lower end. Sliders 224 are installed at both ends of the bottom plate 221 of the sealing device 22 connected to the support rods 21, and the sliders 224 are installed in cooperation with the sliding rails 213. The sealing devices 22 on the two support rods 21 at the upper end and the sealing devices 22 on the two support rods 21 at the lower end are connected by a positioning rod 23. The positioning rod 23 is fixed to one side of the sealing device 22 and slidably connected to the other side of the sealing device 22; the sealing device 22 on the two support rods 21 at the upper end is provided with an adjusting device 24 for adjusting the position. The positioning rod 23 is used to synchronously adjust the movement of the upper sealing device 22 and the lower sealing device 22. The adjusting device 24 can adopt a lead screw structure, or a rack and pinion structure for adjustment, or other adjustment structures.

[0039] In a preferred embodiment, the adjustment device 24 includes a fixing plate 241 horizontally mounted on the two upper support rods 21, and a screw base 242 fixedly mounted on the bottom plate 221. One end of the screw rod 243 is rotatably connected to the fixing plate 241, and the other end is in threaded and rotational connection with the screw base 242. The end connected to the fixing plate 241 extends outward, and a handwheel 244 is installed at the end. The structure is simple. By rotating the handwheel 244, the position of the sealing device 22 can be adjusted. With the above structure, the adjustment device 24 moves along with the two upper support rods 21, and the position of the sealing device 22 can be adjusted.

[0040] In a preferred embodiment, referring to Figure 1 、 5 , the driving device 40 includes a rack 41 meshing with the gear 35. One end of the rack 41 is connected to the piston rod of the air cylinder 44, and the air cylinder 44 is fixedly connected to the support 43 installed on the frame 10; a guiding groove block 42 is provided at the bottom of the rack 41. The guiding groove block 42 limits the rack 41, and the rack 41 slides within the guiding groove block 42. The air cylinder 44 drives the rack 41 to reciprocate. The structure is simple and easy to use. By customizing the stroke of the air cylinder 44, the reciprocating distance can be controlled, avoiding the cumbersome control program of using a motor drive.

[0041] Further, in a preferred embodiment, support bearing seats 36 are installed on the rotating shafts 34 on one side or both sides of the gear 35 and connected to the frame 10. To prevent deformation of the rotating shaft 34 during rotation due to insufficient rigidity of the rotating shaft 34, the support bearing seats 36 are used to prevent deformation of the rotating shaft 34.

[0042] In order to support the packaging bag film when it passes through the upper and lower sealing devices 22, a non-powered roller 13 is provided inside the frame 10 at the height position of the packaging bag film on the production line. The roller 13 is located on both sides of the sealing device 22.

[0043] Embodiment 2

[0044] A synchronous heat-sealing method using a synchronous heat-sealing device for a medical packaging bag includes the following steps:

[0045] S1. Pass the film for producing the medical packaging bag through between the sealing devices 22 respectively installed on the two upper support rods 21 and the two lower support rods 21;

[0046] S2. When the film used for producing medical packaging bags moves on the production line and reaches the preset sealing position, the production line stops; the piston rod of the air cylinder 44 retracts, pulling the rack 41, and the rack 41 drives the gear 35 to rotate clockwise, thereby driving the rotating block 31 to swing clockwise. One end of the rotating block 31 pulls the first connecting rod 32 downward, and the first connecting rod 32 pulls the upper support rod 21 downward. At the same time, the other end of the rotating block 31 pushes the second connecting rod 33 upward, and the second connecting rod 33 pushes the lower support rod 21 upward, so that the sealing devices 22 respectively installed on the two support rods 21 at the upper and lower ends move towards each other and approach, and perform double-sided synchronous heat sealing on the medical packaging bags;

[0047] S3. After the heat sealing is completed, the piston rod of the air cylinder 44 extends, pushing the rack 41, and the rack 41 drives the gear 35 to rotate counterclockwise, thereby driving the rotating block 31 to swing counterclockwise. One end of the rotating block 31 pushes the first connecting rod 32 upward, and the first connecting rod 32 pushes the upper support rod 21 upward. At the same time, the other end of the rotating block 31 pulls the second connecting rod 33 downward, and the second connecting rod 33 pulls the lower support rod 21 downward, so that the sealing devices 22 respectively installed on the two support rods 21 at the upper and lower ends move in the opposite direction and separate;

[0048] S4. The production line starts, waits for the next preset sealing position, and repeats steps S2 - S3.

[0049] Between S1 and S2, there is also a step of adjusting the positions of the two opposite sealing devices 22 at the upper and lower ends. Rotate the handwheel 244 to adjust the positions of the sealing devices 22 to suit the production of packaging bags of various width dimensions and specifications.

[0050] Before S1, there is also a step of adjusting the sealing height of the sealing devices 22 respectively installed on the two support rods 21 at the upper end and the two support rods 21 at the lower end in the closed state. The lengths of the first connecting rod 32 and the second connecting rod 33 can be adjusted. For example, a double - headed screw with reverse threads is used. Eyelets are installed at both ends of the double - headed screw, and the eyelets are respectively connected to the extension shaft 212 and the rotating block 31. By rotating and adjusting the double - headed screw, the lengths of the first connecting rod 32 and the second connecting rod 33 are extended or shortened, so as to adjust the sealing height of the sealing device 22 in the closed state to be consistent with the running height of the film on the production line. When the lengths of the first connecting rod 32 and the second connecting rod 33 are extended, the sealing height moves upward; when the lengths of the first connecting rod 32 and the second connecting rod 33 are shortened, the sealing height moves downward; when one is extended and the other is shortened, the distance when the upper and lower sealing devices 22 approach is adjusted.

[0051] The working process and principle of the present invention:

[0052] See Figure 1, when sealing, the piston rod of the air cylinder 44 retracts, pulling the rack 41. The rack 41 drives the gear 35 to rotate clockwise, thereby driving the rotating block 31 to swing clockwise. One end of the rotating block 31 pulls the first connecting rod 32 downward, and the first connecting rod 32 pulls the upper support rod 21 downward. At the same time, the other end of the rotating block 31 pushes the second connecting rod 33 upward, and the second connecting rod 33 pushes the lower support rod 21 upward. Thus, the sealing devices 22 respectively installed on the two support rods 21 at the upper and lower ends move towards each other and approach, and heat-seal the medical packaging bag.

[0053] After the heat sealing is completed, the piston rod of the air cylinder 44 extends, pushing the rack 41. The rack 41 drives the gear 35 to rotate counterclockwise, thereby driving the rotating block 31 to swing counterclockwise. One end of the rotating block 31 pushes the first connecting rod 32 upward, and the first connecting rod 32 pushes the upper support rod 21 upward. At the same time, the other end of the rotating block 31 pulls the second connecting rod 33 downward, and the second connecting rod 33 pulls the lower support rod 21 downward. Thus, the sealing devices 22 respectively installed on the two support rods 21 at the upper and lower ends move in opposite directions and separate, facilitating the passage of the plastic bag film for processing.

Claims

1. A synchronous heat-sealing device for a medical packaging bag, comprising a frame (10), characterized in that: On the upper and lower ends inside the frame (10), two support rods (21) are respectively installed. Sealing devices (22) for sealing medical packaging bags are respectively installed on the two support rods (21) at the upper and lower ends. The sealing devices (22) installed on the two support rods (21) at the upper end are opposite in direction to the sealing devices (22) installed on the two support rods (21) at the lower end; both ends of the support rod (21) are slidably connected to the upper and lower parts of the frame (10). Longitudinal long holes (11) are provided at both ends of the frame (10) where the support rod (21) is located. Extension shafts (212) are provided at both ends of the support rod (21) and extend outwards through the long holes (11); Rotating shafts (34) are respectively provided below the two support rods (21) at the lower end of the frame (10). Both ends of the rotating shaft (34) are rotatably connected to the frame (10) and extend out of the frame (10). Rotating blocks (31) are fixedly installed at both ends of the rotating shaft (34); The rotating shaft (34) is fixedly connected to the central hole of the rotating block (31). One end of the rotating block (31) is rotatably connected to the extension shaft (212) of the upper support rod (21) through a first connecting rod (32), and the other end is rotatably connected to the extension shaft (212) of the lower support rod (21) through a second connecting rod (33); A gear (35) is installed on the rotating shaft (34). The driving device (40) drives the gear (35) to rotate forward and backward to drive the two support rods (21) at the upper end and the two support rods (21) at the lower end to move synchronously in opening and closing. The sealing device (22) includes a bottom plate (221) respectively connected to the two support rods (21) at the upper end and the two support rods (21) at the lower end. A buffer cylinder (222) is installed on the bottom plate (221). A heat sealing knife (223) is installed on the piston rod of the buffer cylinder (222). Sliding rails (213) are provided on the opposite sides of the two support rods (21) at the upper end and the two support rods (21) at the lower end. Sliders (224) are installed at both ends of the bottom plate (221) of the sealing device (22) connected to the support rod (21). The sliders (224) are installed in cooperation with the sliding rails (213); The sealing devices (22) on the two support rods (21) at the upper end and the two support rods (21) at the lower end are connected by a positioning rod (23). The positioning rod (23) is fixed to one side of the sealing device (22) and slidably connected to the other side of the sealing device (22); An adjusting device (24) for adjusting the position is provided on the sealing device (22) on the two support rods (21) at the upper end. On the inner side of the frame (10), two opposite sliding grooves (12) are fixedly installed on both sides of the long hole (11). Rectangular sliders (211) are respectively provided at both ends of the support rod (21) and are slidably clamped in the two opposite sliding grooves (12).

2. The synchronous heat-sealing device for a medical packaging bag according to claim 1, characterized in that: The adjustment device (24) includes a fixing plate (241) horizontally installed on the two upper support rods (21), and a screw base (242) fixedly installed on the bottom plate (221). One end of a screw rod (243) is rotatably connected to the fixing plate (241), and the other end is in threaded and rotational connection with the screw base (242). The end connected to the fixing plate (241) extends outwards, and a hand wheel (244) is installed at the end.

3. The synchronous heat-sealing device for a medical packaging bag according to claim 1, characterized in that: The driving device (40) includes a rack (41) meshing with the gear (35). One end of the rack (41) is connected to the piston rod of a cylinder (44), and the cylinder (44) is fixedly connected to a support (43) installed on the frame (10); a guiding groove block (42) is provided at the bottom of the rack (41).

4. A synchronous heat-sealing device for a medical packaging bag according to claim 3, characterized in that: Support bearing seats (36) are installed on the rotating shafts (34) on one side or both sides of the gear (35) and connected to the frame (10).

5. A synchronous heat-sealing method using the synchronous heat-sealing device for a medical packaging bag described in claim 3, characterized in that: It includes the following steps: S1. Pass the film for producing medical packaging bags through between the sealing devices (22) respectively installed on the two upper support rods (21) and the two lower support rods (21). S2. When the film for producing medical packaging bags moves on the production line and reaches the preset sealing position, the production line stops; the piston rod of the cylinder (44) retracts, pulling the rack (41). The rack (41) drives the gear (35) to rotate clockwise, thereby driving the rotating block (31) to swing clockwise. One end of the rotating block (31) pulls the first connecting rod (32) downwards, and the first connecting rod (32) pulls the upper support rod (21) downwards. At the same time, the other end of the rotating block (31) pushes the second connecting rod (33) upwards, and the second connecting rod (33) pushes the lower support rod (21) upwards, so that the sealing devices (22) respectively installed on the two upper and lower support rods (21) move towards each other and approach, and perform double-sided synchronous heat sealing on the medical packaging bags. S3. After the heat sealing is completed, the piston rod of the cylinder (44) extends, pushing the rack (41). The rack (41) drives the gear (35) to rotate counterclockwise, thereby driving the rotating block (31) to swing counterclockwise. One end of the rotating block (31) pushes the first connecting rod (32) upwards, and the first connecting rod (32) pushes the upper support rod (21) upwards. At the same time, the other end of the rotating block (31) pulls the second connecting rod (33) downwards, and the second connecting rod (33) pulls the lower support rod (21) downwards, so that the sealing devices (22) respectively installed on the two upper and lower support rods (21) move in the opposite direction and separate. S4. The production line starts, waits for the next preset sealing position, and repeats steps S2 - S3.

6. The synchronous heat-sealing method of a synchronous heat-sealing device for a medical packaging bag according to claim 5, characterized in that: Between S1 and S2, it also includes the step of adjusting the positions of the two relatively sealing devices (22) at the upper and lower ends.

7. A synchronous heat-sealing method for a synchronous heat-sealing device of a medical packaging bag according to claim 6, characterized in that: Before S1, it also includes the step of adjusting the sealing height in the closed state of the sealing devices (22) respectively installed on the two upper support rods (21) and the two lower support rods (21).

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