Plastic film sealing machine

Abstract

The utility model provides a plastic film sealing machine, which relates to the technical field of food packaging sealing machines and comprises a conveyor belt, a packaging bag centering feeding limiting mechanism, a sealing mechanism, a guide slope structure, a lifting limiting part transverse adjusting structure and a lifting limiting part. According to the device, packaging bag feeding is subjected to centering limiting through the packaging bag centering feeding limiting mechanism, the packaging bag feeding enters the sealing mechanism through guiding of the guiding slope surface structure, and the feeding end of the packaging bag is shielded and limited through the lifting limiting piece; the transverse position of the lifting limiting piece can be adjusted through the lifting limiting piece transverse adjusting structure, then the limiting position of the feeding end of the packaging bag can be adjusted, and on the premise that the position of the sealing mechanism is not changed, the limiting position of the feeding end of the packaging bag is changed, so that the sealing depth of the packaging bag can be adjusted; and the device is suitable for different requirements of sealing depths of packaging bags with different sizes.

Description

Technical Field

[0001] The utility model relates to the technical field of food packaging sealing machines, in particular to a plastic film sealing machine. Background Art

[0002] In the food processing industry, food is often packaged in packaging bags, and the packaging of packaging bags requires a plastic film sealing machine.

[0003] When sealing packaging bags, existing plastic film sealing machines generally place the packaging bags directly on a conveyor table and convey the packaging bags to the sealing position of the sealing machine for sealing. However, packaging bags vary in size and have different requirements for sealing depths. The sealing depth of the packaging bags cannot be adjusted only by conveying the conveyor, and adjusting the position of the sealing machine is more troublesome. Utility Model Content

[0004] The utility model aims to provide a plastic film sealing machine, which solves the problem that packaging bags are of different sizes and have different requirements for sealing depths, the sealing depth of the packaging bags cannot be adjusted only by conveying with a conveyor, and the position adjustment of the sealing machine is relatively troublesome.

[0005] The utility model provides a plastic film sealing machine, comprising:

[0006] Conveyor belts;

[0007] The packaging bag centering feeding limiter mechanism is fixedly mounted in the middle of the upper edge of the conveyor belt;

[0008] A sealing mechanism, which is fixedly mounted on the upper edge of the discharge end of the conveyor belt along the width direction;

[0009] A guide slope structure, which is located at the edge of the sealing mechanism away from the discharge end of the conveyor belt, and the lower end of the guide slope structure is fixedly assembled on the upper edge of the conveyor belt;

[0010] The guide slope structure is used to guide the packaging bag into the sealing mechanism;

[0011] The bottom surface of the sealing mechanism is provided with a lifting and limiting member transverse adjustment structure along the length direction on one side close to the discharging end of the conveyor belt;

[0012] The lifting limiter is fixedly assembled on the telescopic driving end of the lateral adjustment structure of the lifting limiter.

[0013] As a further optimization scheme, in order to center the feed and avoid deviation of the sealing position due to deviation of the feed position, the packaging bag centering feed limiting mechanism includes:

[0014] There are two side plates arranged in parallel at the front and rear sides, and the two side plates are respectively fixedly mounted at the front and rear sides of the upper edge of the conveyor belt;

[0015] The outer sides of the two side plates are fixedly mounted with a first electric push rod, and the telescopic end of the first electric push rod passes through the side plate on the same side;

[0016] The telescopic end of the first electric push rod is fixedly equipped with a limit baffle, and the lower end of the limit baffle is slidably fitted with the upper surface of the conveyor belt.

[0017] As a further optimization solution, in order to perform heat-pressure sealing on the packaging bag located between them when pressing down against the strip bottom plate, the sealing mechanism includes:

[0018] A strip bottom plate, which is fixedly mounted on the upper edge of the discharging end of the conveyor belt along the width direction, and the upper surface of the strip bottom plate is the inner bottom surface of the sealing mechanism;

[0019] Support rods are vertically fixedly mounted at the four corners of the upper surface of the strip bottom plate;

[0020] A strip-shaped top plate, the bottom surface of which is fixedly assembled on the upper end of the support rod;

[0021] A second electric push rod is fixedly mounted on both the front and rear sides of the upper surface of the strip-shaped top plate, and the telescopic end of the second electric push rod passes through the strip-shaped top plate;

[0022] The hot-pressing sealing member is fixedly assembled on the telescopic lower end of the second electric push rod, and the hot-pressing sealing member is the movable part of the sealing mechanism.

[0023] As a further optimization solution, in order to make the metal sealing strip evenly heated, the hot pressing sealing member includes:

[0024] A strip-shaped heat-conducting metal plate is longitudinally and parallelly arranged above the strip-shaped bottom plate;

[0025] A strip-shaped heat-insulating shell is fixedly mounted on the upper surface of the strip-shaped heat-conducting metal plate along the length direction;

[0026] The strip-shaped heat-insulating shell is evenly and fixedly equipped with electric heating wires, and the electric heating wires are attached to the strip-shaped heat-conducting metal plate;

[0027] A metal sealing strip is welded along the length direction at the middle of the bottom surface of the strip-shaped heat-conducting metal plate.

[0028] As a further optimization solution, in order to guide the feeding of the packaging bag into the sealing mechanism, the guiding slope structure includes:

[0029] There are two fixed seats, which are parallelly distributed in front and back, and the two fixed seats are respectively fixedly assembled on the front and back sides of the upper edge of the conveyor belt;

[0030] A round roller, both ends of which are rotatably connected to the inner side surface of the fixing seat on the same side;

[0031] A sloped plate, the side of which close to the discharging end of the conveyor belt is a higher end, and the higher end of the sloped plate extends to the upper surface of the round roller;

[0032] The lower end of the slope panel is fixedly assembled on the front and rear sides of the upper edge of the conveyor belt.

[0033] As a further optimization scheme, in order to laterally adjust the position of the lifting limiter, the lifting limiter lateral adjustment structure includes:

[0034] A rectangular groove is provided along the length direction on the bottom surface of the sealing mechanism and close to the discharging end of the conveyor belt;

[0035] A third electric push rod is evenly fixedly mounted on one side of the inner wall of the rectangular groove close to the discharging end of the conveyor belt, and the telescopic end of the third electric push rod is the telescopic driving end of the lateral adjustment structure of the lifting limiter;

[0036] The lifting limiter is fixedly assembled on the telescopic end of the third electric push rod.

[0037] As a further optimization scheme, in order to raise the strip iron piston block to limit and block the feeding of the packaging bag when necessary, and lower the strip iron piston block after sealing, so that the sealed packaging bag can pass normally, the lifting limiter includes:

[0038] A strip-shaped rectangular block is inserted into the rectangular groove along the length direction, and the strip-shaped rectangular block is fixedly assembled on the telescopic end of the third electric push rod;

[0039] The upper surface of the strip-shaped rectangular block is provided with a strip-shaped groove along the length direction;

[0040] The inner cavity bottom surface of the strip-shaped groove is evenly and fixedly equipped with electromagnets;

[0041] A strip-shaped iron piston block is slidably inserted into the upper end of the inner cavity of the strip-shaped groove;

[0042] A spring is fixedly connected between the bottom surface of the strip-shaped iron piston block and the electromagnet;

[0043] When the electromagnet is energized, the strip-shaped iron piston block squeezes the spring and is adsorbed and fixed on the electromagnet;

[0044] When the electromagnet is powered off, the spring supports the strip-shaped iron piston block to extend out of the strip-shaped groove.

[0045] As a further optimization scheme, in order to enable the lifting limiter to roll on the bottom surface of the inner cavity of the rectangular groove when it moves horizontally, and provide smooth support during the movement process, the bottom surface of the strip-shaped rectangular block is evenly and movably clamped with a ball, and the lower end of the ball is in contact with the bottom surface of the inner cavity of the rectangular groove.

[0046] As a further optimization solution, in order to provide separate power supply to the movable parts of the lifting limiter and the sealing mechanism, it also includes:

[0047] There are at least two charging power sources, and the two charging power sources are respectively adhered to and electrically connected to the lifting limiter and the movable part of the sealing mechanism.

[0048] As a further optimization scheme, in order to stably support and fix the device, support frames are fixedly installed on both the left and right sides of the bottom surface of the conveyor belt, and the support frames include:

[0049] Two support plates are arranged in parallel in front and back, and the upper ends of the two support plates are fixedly connected to the front and rear edges of the bottom of the conveyor belt respectively;

[0050] The lower edges of the outer sides of the two support plates are integrally formed with connecting ear plates;

[0051] A crossbeam is fixedly connected between the front and rear support plates.

[0052] The utility model provides a plastic film sealing machine through improvement, which has the following improvements and advantages compared with the prior art:

[0053] The device uses a packaging bag centering feed limit mechanism to center the packaging bag feed. The packaging bag feed enters the sealing mechanism through the guidance of the guide slope structure. The feeding end of the packaging bag is blocked and limited by the lifting limit member. The lateral position of the lifting limit member can be adjusted by the lateral adjustment structure of the lifting limit member, and thus the limiting position of the feeding end of the packaging bag can also be adjusted. Under the premise that the position of the sealing mechanism remains unchanged, changing the limiting position of the feeding end of the packaging bag can realize the adjustment of the sealing depth of the packaging bag, so that the device is suitable for different requirements for the sealing depth of packaging bags of different sizes. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0055] Figure 1 It is a schematic diagram of the structure of the utility model;

[0056] Figure 2 For this utility model Figure 1 The enlarged structural diagram at A in the middle;

[0057] Figure 3 This is a schematic diagram of the structure of the hot pressing sealing member of the utility model;

[0058] Figure 4 It is a schematic cross-sectional view of the lifting and limiting member structure of the utility model.

[0059] Description of reference numerals:

[0060] 1- conveyor belt, 2- bag centering feeding limit mechanism, 21- side plate, 22- first electric push rod, 23- limit baffle, 3- sealing mechanism, 31- strip bottom plate, 32- support rod, 33- strip top plate, 34- second electric push rod, 35- hot pressing sealing part, 351- strip heat-conducting metal plate, 352- strip insulation shell, 353- electric heating wire, 354- metal sealing strip, 4- guide slope structure , 41-fixed seat, 42-round roller, 43-slope panel, 5-lifting limiter lateral adjustment structure, 51-rectangular groove, 52-third electric push rod, 6-charging power supply, 7-support frame, 71-support plate, 72-crossbeam, 73-connecting ear plate, 8-lifting limiter, 81-strip rectangular block, 82-strip groove, 83-electromagnet, 84-strip iron piston block, 85-spring, 86-ball. DETAILED DESCRIPTION

[0061] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0062] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0063] In the description of the present utility model, it should be understood that the terms "first" and "second" are only used for descriptive purposes, and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0064] See also Figure 1-4 The utility model provides a technical solution: a plastic film sealing machine, comprising:

[0065] Conveyor belt 1, adopts the horizontal conveyor belt in the prior art;

[0066] The packaging bag centering feeding limiter mechanism 2 is fixedly mounted on the middle of the upper edge of the conveyor belt 1. After the packaging bag passes through the centering limiter, it enters the sealing mechanism 3 for sealing;

[0067] A sealing mechanism 3, which is fixedly mounted on the upper edge of the discharge end of the conveyor belt 1 along the width direction;

[0068] The guide slope structure 4 is located at the edge of the sealing mechanism 3 away from the discharge end of the conveyor belt 1, and the lower end of the guide slope structure 4 is fixedly assembled on the upper edge of the conveyor belt 1;

[0069] The guide slope structure 4 is used to guide the packaging bag into the sealing mechanism 3;

[0070] A lifting and limiting member transverse adjustment structure 5 is installed along the length direction on the inner bottom surface of the sealing mechanism 3 near the discharge end of the conveyor belt 1;

[0071] The lifting limiter 8 is fixedly mounted on the telescopic driving end of the lifting limiter lateral adjustment structure 5. The lifting limiter lateral adjustment structure 5 can drive the lifting limiter 8 to move in the lateral position to adjust the position of the blocking limit on the end of the packaging bag.

[0072] In some embodiments, in order to center the feed and prevent the feed position from being offset and causing the sealing position to deviate, the packaging bag centering feed limiting mechanism 2 includes:

[0073] There are two side plates 21 arranged parallel to each other at the front and rear sides, and the two side plates 21 are respectively fixedly mounted at the front and rear sides of the upper edge of the conveyor belt 1;

[0074] The outer sides of the two side plates 21 are fixedly mounted with first electric push rods 22, and the telescopic ends of the first electric push rods 22 penetrate the side plates 21 on the same side;

[0075] A limit baffle 23 is fixedly mounted on the telescopic end of the first electric push rod 22 , and the lower end of the limit baffle 23 is slidably fitted to the upper surface of the conveyor belt 1 .

[0076] The first electric push rods 22 on both sides are connected in parallel to an external power supply, and the two first electric push rods 22 work synchronously. When the two first electric push rods 22 are extended, the two side plates 21 move toward each other and push the packaging bag to the center. Then the first electric push rods 22 on both sides are controlled to retract a small distance, so that a small gap is left between the two side plates 21 and the outer wall of the packaging bag, ensuring that the packaging bag can be conveyed normally and limiting the conveying direction of the packaging bag. The above control process can be performed manually or by a controller.

[0077] In some embodiments, in order to perform heat-pressure sealing on the packaging bag located therebetween when pressed against the strip bottom plate 31, the sealing mechanism 3 includes:

[0078] A strip bottom plate 31 is fixedly mounted on the upper edge of the discharge end of the conveyor belt 1 along the width direction, and the upper surface of the strip bottom plate 31 is the inner bottom surface of the sealing mechanism 3;

[0079] Support rods 32 are vertically fixedly mounted at the four corners of the upper surface of the strip bottom plate 31;

[0080] The strip top plate 33 has its bottom surface fixedly mounted on the upper end of the support rod 32;

[0081] The second electric push rod 34 is fixedly mounted on both the front and rear sides of the upper surface of the strip top plate 33, and the telescopic end of the second electric push rod 34 passes through the strip top plate 33;

[0082] The hot-pressing sealing member 35 is fixedly assembled on the telescopic lower end of the second electric push rod 34. The hot-pressing sealing member 35 is the movable part of the sealing mechanism 3. The two second electric push rods 34 are connected in parallel and connected to an external power supply. The two second electric push rods 34 work synchronously to drive the hot-pressing sealing member 35 to rise and fall. The hot-pressing sealing member 35 is heated after being energized. When the hot-pressing sealing member 35 descends to the lower end and abuts against the strip bottom plate 31, the end of the packaging bag between the hot-pressing sealing member 35 and the strip bottom plate 31 can be hot-pressed and sealed.

[0083] In some embodiments, in order to make the metal sealing strip 354 evenly heated, the hot pressing sealing member 35 comprises:

[0084] A strip-shaped heat-conducting metal plate 351 is longitudinally and parallelly arranged above the strip-shaped bottom plate 31;

[0085] A strip-shaped heat-insulating shell 352 is fixedly mounted on the upper surface of the strip-shaped heat-conducting metal plate 351 along the length direction;

[0086] The strip-shaped heat-insulating shell 352 is evenly fixed with the heating wire 353, and the heating wire 353 is attached to the strip-shaped heat-conducting metal plate 351. The strip-shaped heat-insulating shell 352 is used to slow down the dissipation speed of the heat emitted by the heating wire 353.

[0087] A metal sealing strip 354 is welded along the length direction in the middle of the bottom surface of the strip-shaped heat-conducting metal plate 351; the heating wires 353 are connected in parallel to a power supply, and the heat of the heating wires 353 is transferred to the metal sealing strip 354 through the strip-shaped heat-conducting metal plate 351. Through this heat transfer process, the uniformity of heating of the metal sealing strip 354 can be improved, and at the same time, the overheating of the metal sealing strip 354 affecting the sealing quality can be avoided.

[0088] In some embodiments, in order to guide the packaging bag feed into the sealing mechanism 3, the guide ramp structure 4 includes:

[0089] There are two fixed seats 41 distributed in parallel at the front and rear sides, and the two fixed seats 41 are respectively fixedly assembled at the front and rear sides of the upper edge of the conveyor belt 1;

[0090] The two ends of the round roller 42 are rotatably connected to the inner side surface of the fixing seat 41 on the same side;

[0091] The slope panel 43 has a higher end on the side close to the discharge end of the conveyor belt 1, and the higher end of the slope panel 43 extends to the upper surface of the round roller 42;

[0092] The lower end of the ramp panel 43 is fixedly mounted on the front and rear sides of the upper edge of the conveyor belt 1 . The packaging bag moving along the ramp surface of the ramp panel 43 contacts the arc surface of the roller 42 and is guided into the sealing mechanism 3 along the arc surface of the roller 42 .

[0093] In some embodiments, in order to laterally adjust the position of the lifting limiter 8, the lifting limiter lateral adjustment structure 5 includes:

[0094] A rectangular groove 51 is provided along the length direction on the inner bottom surface of the sealing mechanism 3 near the discharge end of the conveyor belt 1;

[0095] A third electric push rod 52 is evenly fixedly mounted on the inner wall of the rectangular groove 51 near the discharging end of the conveyor belt 1. The telescopic end of the third electric push rod 52 is the telescopic driving end of the lifting limiter transverse adjustment structure 5.

[0096] The lifting limiter 8 is fixedly assembled on the telescopic end of the third electric push rod 52. The third electric push rods 52 are connected in parallel to an external power supply. The plurality of third electric push rods 52 work synchronously to drive the lifting limiter 8 to move horizontally.

[0097] In some embodiments, in order to raise the strip iron piston block 84 to limit and block the feeding of the packaging bag when necessary, and lower the strip iron piston block 84 after sealing, so that the sealed packaging bag can pass normally, the lifting limiter 8 includes:

[0098] The strip-shaped rectangular block 81 is inserted into the rectangular groove 51 along the length direction, and the strip-shaped rectangular block 81 is fixedly assembled on the telescopic end of the third electric push rod 52;

[0099] The upper surface of the strip-shaped rectangular block 81 is provided with a strip-shaped groove 82 along the length direction;

[0100] The inner cavity bottom surface of the strip-shaped groove 82 is evenly fixed with an electromagnet 83. When the electromagnet 83 is energized, it adsorbs and fixes the strip-shaped iron piston block 84, and loses its magnetic force when the power is turned off.

[0101] A strip-shaped iron piston block 84 is slidably inserted into the upper end of the inner cavity of the strip-shaped groove 82;

[0102] A spring 85 is fixedly connected between the bottom surface of the strip-shaped iron piston block 84 and the electromagnet 83;

[0103] When the electromagnet 83 is energized, the strip-shaped iron piston block 84 squeezes the spring 85 and is adsorbed and fixed on the electromagnet 83;

[0104] When the electromagnet 83 is powered off, the spring 85 supports the strip-shaped iron piston block 84 to extend out of the strip-shaped groove 82 .

[0105] In some embodiments, in order to enable the lifting limit member 8 to roll on the bottom surface of the inner cavity of the rectangular groove 51 when moving horizontally and provide smooth support during the movement process, the bottom surface of the strip rectangular block 81 is evenly and movably clamped with a ball 86, and the lower end of the ball 86 is in contact with the bottom surface of the inner cavity of the rectangular groove 51.

[0106] In some embodiments, in order to separately power the lifting limiter 8 and the movable part of the sealing mechanism 3, the following is also included:

[0107] There are at least two charging power supplies 6, which are respectively pasted and electrically connected to the lifting limit member 8 and the movable part of the sealing mechanism 3. One charging power supply 6 is used to supply power to the electromagnet 83 in the lifting limit member 8, and the other charging power supply 6 is used to supply power to the heating wire 353 of the middle hot pressing sealing member 35 of the sealing mechanism 3.

[0108] In some embodiments, in order to stably support and fix the device, support frames 7 are fixedly mounted on both the left and right sides of the bottom surface of the conveyor belt 1. The support frame 7 includes:

[0109] There are two support plates 71 arranged parallel to each other at the front and rear ends, and the upper ends of the two support plates 71 are fixedly connected to the front and rear edges of the bottom of the conveyor belt 1 respectively;

[0110] The lower edges of the outer sides of the two support plates 71 are integrally formed with connecting ear plates 73, and the connecting ear plates 73 can be fixed on the concrete floor by expansion bolts;

[0111] The cross beam 72 is fixedly connected between the front and rear support plates 71 . The provision of the cross beam 72 improves the mechanical strength of the support plates 71 on both sides.

[0112] Working principle:

[0113] The packaging bag containing food is placed in the middle of the feeding end of the conveyor belt 1, and the packaging bag containing food is transported by the conveyor belt 1. During the transportation process, the packaging bag centering feeding limit mechanism 2 works, and the first electric push rods 22 on both sides are connected in parallel and connected to an external power supply. The two first electric push rods 22 work synchronously. When the two first electric push rods 22 are extended, the two side plates 21 move toward each other to push the packaging bag to the center, and then the first electric push rods 22 on both sides are controlled to retract a small distance, so that a small gap is left between the two side plates 21 and the outer wall of the packaging bag, so as to ensure that the packaging bag can be transported normally and limit the conveying direction of the packaging bag;

[0114] After being centered and limited, the packaging bag containing food is guided by the slope structure 4 to the sealing mechanism 3. The third electric push rods 52 of the lifting and limiting member transverse adjustment structure 5 are connected in parallel and connected to an external power supply. Multiple third electric push rods 52 work synchronously to drive the lifting and limiting member 8 to move transversely to adjust the position of the blocking limit of the end of the packaging bag. Under the premise that the position of the sealing mechanism 3 remains unchanged, the limit position of the feeding end of the packaging bag can be changed to achieve the adjustment of the sealing depth of the packaging bag.

[0115] When the electromagnet 83 in the lifting limiter 8 is powered off, the spring 85 supports the strip-shaped iron piston block 84 to extend the strip-shaped groove 82 and the rectangular groove 51 to limit and block the end of the packaging bag; when the electromagnet 83 is powered on, the strip-shaped iron piston block 84 squeezes the spring 85 and is adsorbed and fixed on the electromagnet 83, and the upper end of the strip-shaped iron piston block 84 no longer extends out of the rectangular groove 51, so that the sealed packaging bag can pass normally.

[0116] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A plastic film sealing machine, characterized in that: include: Conveyor belt (1); A packaging bag centering feeding limiting mechanism (2) is fixedly mounted on the middle of the upper edge of the conveyor belt (1); A sealing mechanism (3) which is fixedly mounted on the upper edge of the discharge end of the conveyor belt (1) along the width direction; A guide slope structure (4), which is located at the edge of the sealing mechanism (3) away from the discharge end of the conveyor belt (1), and the lower end of the guide slope structure (4) is fixedly mounted on the upper edge of the conveyor belt (1); The guide slope structure (4) is used to guide the packaging bag into the sealing mechanism (3); The bottom surface of the sealing mechanism (3) is provided with a lifting and limiting member transverse adjustment structure (5) along the length direction on one side close to the discharge end of the conveyor belt (1); The lifting and limiting member (8) is fixedly assembled on the telescopic driving end of the lifting and limiting member transverse adjustment structure (5).

2. A plastic film sealing machine according to claim 1, characterized in that: The packaging bag centering feeding limiting mechanism (2) comprises: Two side plates (21) are arranged parallel to each other in the front and rear sides, and the two side plates (21) are respectively fixedly mounted on the front and rear sides of the upper edge of the conveyor belt (1); The outer side surfaces of the two side plates (21) are fixedly mounted with first electric push rods (22), and the telescopic end of the first electric push rod (22) penetrates the side plate (21) on the same side; The telescopic end of the first electric push rod (22) is fixedly equipped with a limit baffle (23), and the lower end of the limit baffle (23) is slidably fitted with the upper surface of the conveyor belt (1).

3. A plastic film sealing machine according to claim 1, characterized in that: The sealing mechanism (3) comprises: A strip bottom plate (31) is fixedly mounted on the upper edge of the discharge end of the conveyor belt (1) along the width direction, and the upper surface of the strip bottom plate (31) is the inner bottom surface of the sealing mechanism (3); Support rods (32) are vertically fixedly mounted at the four corners of the upper surface of the strip bottom plate (31); A strip-shaped top plate (33), the bottom surface of which is fixedly assembled on the upper end of the support rod (32); A second electric push rod (34) is fixedly mounted on both the front and rear sides of the upper surface of the strip-shaped top plate (33), and the telescopic end of the second electric push rod (34) passes through the strip-shaped top plate (33); The hot-pressing sealing member (35) is fixedly mounted on the telescopic lower end of the second electric push rod (34), and the hot-pressing sealing member (35) is the movable part of the sealing mechanism (3).

4. A plastic film sealing machine according to claim 3, characterized in that: The hot pressing sealing member (35) comprises: A strip-shaped heat-conducting metal plate (351) is longitudinally and parallelly arranged above the strip-shaped bottom plate (31); A strip-shaped heat-insulating shell (352) is fixedly mounted on the upper surface of the strip-shaped heat-conducting metal plate (351) along the length direction; The strip-shaped heat-insulating shell (352) is evenly and fixedly equipped with electric heating wires (353), and the electric heating wires (353) are in contact with the strip-shaped heat-conducting metal plate (351); A metal sealing strip (354) is welded to the middle of the bottom surface of the strip-shaped heat-conducting metal plate (351) along the length direction.

5. A plastic film sealing machine according to claim 1, characterized in that: The guide slope structure (4) comprises: Two fixed seats (41) are arranged parallel to each other in the front and rear, and the two fixed seats (41) are respectively fixedly mounted on the front and rear sides of the upper edge of the conveyor belt (1); The two ends of the round roller (42) are respectively rotatably connected to the inner side surface of the fixing seat (41) on the same side; A sloped panel (43) having a higher end on the side close to the discharge end of the conveyor belt (1), and the higher end of the sloped panel (43) extends to the upper surface of the round roller (42); The lower end of the slope panel (43) is fixedly mounted on the front and rear sides of the upper edge of the conveyor belt (1).

6. A plastic film sealing machine according to claim 1, characterized in that: The lifting and limiting member lateral adjustment structure (5) comprises: A rectangular groove (51) is provided along the length direction on the inner bottom surface of the sealing mechanism (3) close to the discharge end of the conveyor belt (1); A third electric push rod (52) is evenly fixedly mounted on one side of the inner wall of the rectangular groove (51) close to the discharge end of the conveyor belt (1), and the telescopic end of the third electric push rod (52) is the telescopic driving end of the lifting limiter transverse adjustment structure (5); The lifting limiter (8) is fixedly mounted on the telescopic end of the third electric push rod (52).

7. A plastic film sealing machine according to claim 6, characterized in that: The lifting and limiting member (8) comprises: A strip-shaped rectangular block (81) is inserted into the rectangular groove (51) along the length direction, and the strip-shaped rectangular block (81) is fixedly assembled on the telescopic end of the third electric push rod (52); The upper surface of the strip-shaped rectangular block (81) is provided with a strip-shaped groove (82) along the length direction; The inner cavity bottom surface of the strip-shaped groove (82) is evenly and fixedly equipped with an electromagnet (83); A strip-shaped iron piston block (84) is slidably inserted into the upper end of the inner cavity of the strip-shaped groove (82); A spring (85) is fixedly connected between the bottom surface of the strip-shaped iron piston block (84) and the electromagnet (83); When the electromagnet (83) is energized, the strip-shaped iron piston block (84) squeezes the spring (85) to be adsorbed and fixed on the electromagnet (83); When the electromagnet (83) is powered off, the spring (85) supports the strip-shaped iron piston block (84) to extend out of the strip-shaped groove (82).

8. A plastic film sealing machine according to claim 7, characterized in that: The bottom surface of the strip-shaped rectangular block (81) is evenly and movably engaged with a ball (86), and the lower end of the ball (86) is in contact with the bottom surface of the inner cavity of the rectangular groove (51).

9. A plastic film sealing machine according to claim 1, characterized in that: Also includes: There are at least two charging power sources (6), and the two charging power sources (6) are respectively adhered to and electrically connected to the lifting limiter (8) and the movable part of the sealing mechanism (3).

10. A plastic film sealing machine according to claim 1, characterized in that: The left and right sides of the bottom surface of the conveyor belt (1) are fixedly equipped with support frames (7), and the support frames (7) include: Two support plates (71) are arranged parallel to each other in the front and rear sides, and the upper ends of the two support plates (71) are respectively fixedly connected to the front and rear edges of the bottom of the conveyor belt (1); A connecting ear plate (73) is integrally formed at the lower edge of the outer side surface of the two support plates (71); A crossbeam (72) is fixedly connected between the front and rear support plates (71).

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