Sealing mechanism for plastic bag

Abstract

The utility model discloses a plastic bag sealing mechanism which comprises a sealing frame, a sealing assembly and a driving assembly, and the sealing frame comprises two side plates which are symmetrically arranged and a connecting plate which stretches across the two side plates; the sealing assembly comprises a first heat sealing piece and a second heat sealing piece, the first heat sealing piece is arranged on the outer side of one end of each side plate in the first direction, the second heat sealing piece is arranged between the two side plates in the first direction, and a clamping space is formed between the second heat sealing piece and the first heat sealing piece; the driving assembly comprises a driving part and a rotating arm, the rotating arm is rotatably connected to the connecting plate, one end of the rotating arm is connected with the second heat sealing part, the other end of the rotating arm is connected with an output shaft of the driving part, and the driving part is used for driving the rotating arm to rotate so as to drive the second heat sealing part to move back and forth in the second direction to be close to or away from the first heat sealing part. The plastic bag sealing mechanism is simple in structure, convenient to operate, high in automation degree, high in heat sealing speed and attractive in sealing, and production efficiency and sealing quality are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a sealing equipment technical field, especially a sealing mechanism of plastic bag. BACKGROUND

[0002] Plastic bags are made of nitrocellulose as the main raw material, which is an essential item in people's daily life and is often used to pack other items. At present, in the manufacturing process of plastic bags, sealing is one of the important processes in the manufacturing of plastic bags. A sealing iron is used to heat the sealing position of the plastic bag to a viscous state, and a certain pressure is applied to fuse the two layers of the diaphragm into one, and after cooling, a certain strength is maintained, thereby completing the sealing operation. However, most of the current packaging sealing equipment basically uses indentation heat sealing process. Due to insufficient time control, it is easy to cause incomplete heat sealing and adhesion of the packaging bag, resulting in rupture of the sealing of the packaging. Some use bidirectional track heat sealing process, but all use manual packaging. If there is negligence, it is easy to cause serious burns to the hands. Both have certain omissions and drawbacks in quality and safety factor SUMMARY

[0003] In order to solve the above technical problems or at least partially solve the above technical problems, the application provides a sealing mechanism of plastic bag.

[0004] The application provides a sealing mechanism of plastic bag, which comprises:

[0005] The sealing frame comprises two side plates arranged symmetrically and a connecting plate transversely arranged between the two side plates;

[0006] The sealing assembly comprises a first heat sealing element and a second heat sealing element, the first heat sealing element is arranged outside one end of the side plate along the first direction, and the second heat sealing element is arranged between the two side plates along the first direction and forms a clamping space for clamping the plastic bag to be sealed between the first heat sealing element and the second heat sealing element;

[0007] The driving assembly comprises a driving element and a rotating arm, the rotating arm is rotatably connected to the connecting plate, one end of the rotating arm is connected to the second heat sealing element, the other end of the rotating arm is connected to the output shaft of the driving element, and the driving element is used to drive the rotating arm to rotate, so as to drive the second heat sealing element to move back and forth along the second direction to approach or move away from the first heat sealing element; the second direction is perpendicular to the first direction.

[0008] In a possible implementation, the rotating arm comprises a first connecting arm, a second connecting arm, and a rotating plate, the rotating plate is rotatably connected to the connecting plate through a rotating shaft, the first connecting arm and the second connecting arm are symmetrically arranged with the center of the rotating plate, one end of the first connecting arm is connected to the output shaft of the driving member, the other end of the first connecting arm is rotatably connected to one end of the rotating plate, one end of the second connecting arm is rotatably connected to the other end of the rotating plate, and the other end of the second connecting arm is connected to the second heat sealing member.

[0009] In a possible implementation, the device further comprises two slide rods extending along the second direction and symmetrically arranged, the slide rods are arranged on the inner side of the corresponding side plates, at least part of the slide rods protrude from the front end of the side plates, and the two ends of the second heat sealing member are respectively slidably connected to the two slide rods.

[0010] In a possible implementation, the device further comprises a limiting plate and an elastic member, the two ends of the limiting plate are fixedly connected to the front ends of the slide rods and located on the outer side of the first heat sealing member, and the elastic member is sleeved on the slide rods and located between the limiting plate and the first heat sealing member.

[0011] In a possible implementation, the first heat sealing member comprises a first heat sealing strip, a first mounting plate, and a first heating rod, the two ends of the first mounting plate are slidably connected to the front ends of the two slide rods, the first heat sealing strip is connected to the side of the first mounting plate facing the second heat sealing member, the first heating rod is arranged in the first heat sealing strip along the first direction, and the surface of the first heat sealing strip facing the second heat sealing member is a first heat sealing surface.

[0012] In a possible implementation, the device further comprises a plurality of first heat insulation pads arranged at intervals, the first heat insulation pads are located between the first heat sealing strip and the first mounting plate, and the two ends of the first heat insulation pads are respectively connected to the first heat sealing strip and the first mounting plate.

[0013] In a possible implementation, the second heat sealing member comprises a second heat sealing strip, a second mounting plate, and a second heating rod, the two ends of the second mounting plate are slidably connected to the two slide rods, the second heat sealing strip is connected to the side of the second mounting plate facing the first heat sealing member, the second heating rod is arranged in the second heat sealing strip along the first direction, and the surface of the second heat sealing strip facing the first heat sealing member is a second heat sealing surface.

[0014] In a possible implementation, a plurality of second heat insulation pads are further arranged at intervals, and the second heat insulation pads are arranged between the second heat sealing strip and the second mounting plate, and two ends of the second heat insulation pads are connected to the second heat sealing strip and the second mounting plate respectively.

[0015] Compared with the prior art, the above technical solution provided by the embodiments of the present application has the following advantages:

[0016] The first heat sealing member is arranged outside one end of the side plate along a first direction, and the second heat sealing member is arranged between the two side plates, and then the rotating arm is driven to rotate by the driving member, and the second heat sealing member is driven to move back and forth along a second direction to approach or move away from the first heat sealing member, so as to heat seal the plastic bag in the clamping space, thereby completing the sealing of the plastic bag. The plastic bag sealing mechanism has simple structure, is convenient to operate, has high automation degree, fast heat sealing speed, beautiful sealing, and effectively reduces the accident rate, improves the production efficiency and sealing quality. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a structural schematic view of the plastic bag sealing mechanism of the utility model;

[0018] Figure 2 is a connection schematic view of the driving assembly and the second heat sealing member in the plastic bag sealing mechanism of the utility model;

[0019] Figure 3 is a structural schematic view of the first heat sealing member in the plastic bag sealing mechanism of the utility model;

[0020] Figure 4 is a structural schematic view of the second heat sealing member in the plastic bag sealing mechanism of the utility model.

[0021] REFERENCE NUMERALS:

[0022] 10, sealing frame; 11, side plate; 12, connecting plate; 20, driving assembly; 21, driving member; 22, rotating arm; 221, rotating plate; 222, first connecting arm; 223, second connecting arm; 30, first heat sealing member; 31, first heat sealing strip; 32, first mounting plate; 33, first heating rod; 40, second heat sealing member; 41, second heat sealing strip; 42, second mounting plate; 43, second heating rod; 50, limiting plate; 60, elastic member; 70, sliding rod; 80, first heat insulation pad; 90, second heat insulation pad. DETAILED DESCRIPTION

[0023] In order to have a clearer understanding of the technical features, objectives and effects of the present application, the specific embodiments of the present application will be described in detail with reference to the drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "upper", "lower", "left", "right", "vertical", "horizontal", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail" and the like are based on the directions or positional relationships shown in the drawings, constructed and operated in a particular direction, and are only for the convenience of describing the present technical solution, and do not indicate that the indicated device or element must have a particular direction, therefore, it cannot be understood as a limitation on the present application.

[0024] It should be further pointed out that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing", "setting" and the like should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements or the interaction relationship between two elements. When an element is referred to as "on" or "under" another element, the element can be "directly" or "indirectly" located on the other element, or there can be one or more intermediate elements. The terms "first", "second", "third" and the like are only for the convenience of describing the present technical solution, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features, therefore, the features with "first", "second", "third" and the like can be explicitly or implicitly included one or more of the features. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0025] In the following description, specific details are presented to facilitate a thorough understanding of the present application, but the present application can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits and methods are omitted to avoid unnecessary details that hinder the description of the present application.

[0026] As Figures 1 to 4As shown, the application provides a sealing mechanism of plastic bag, which comprises a sealing frame 10, a sealing assembly and a driving assembly 20. The sealing frame 10 comprises two symmetrical side plates 11 and a connecting plate 12 which is transversely arranged between the two side plates 11. The sealing assembly comprises a first heat sealing piece 30 and a second heat sealing piece 40. The first heat sealing piece 30 is arranged outside one end of the side plate 11 along a first direction, and the second heat sealing piece 40 is arranged between the two side plates 11 along the first direction and forms a clamping space with the first heat sealing piece 30 for clamping the plastic bag to be sealed. The driving assembly 20 comprises a driving piece 21 and a rotating arm 22. The rotating arm 22 is rotatably connected to the connecting plate 12. One end of the rotating arm 22 is connected to the second heat sealing piece 40, and the other end of the rotating arm 22 is connected to the output shaft of the driving piece 21. The driving piece 21 is used to drive the rotating arm 22 to rotate, so as to drive the second heat sealing piece 40 to move back and forth along a second direction to approach or move away from the first heat sealing piece 30. The second direction is perpendicular to the first direction.

[0027] Here, it should be noted that the "first direction" and the "second direction" are virtual for the convenience of describing the relative position of the first heat sealing piece 30 and the second heat sealing piece 40. For details, please refer to Figure 1 The "first direction" specifically refers to the X direction, and the "second direction" specifically refers to the Y direction.

[0028] Exemplarily, the driving piece 21 can adopt a gas cylinder, or other power components capable of driving the rotating arm 22 to rotate. No limitation is made hereon. In the embodiment, the driving piece 21 adopts a gas cylinder.

[0029] The application arranges the first heat sealing piece 30 outside one end of the side plate 11 along the first direction, and arranges the second heat sealing piece 40 between the two side plates 11. Then, the driving piece 21 drives the rotating arm 22 to rotate, and further drives the second heat sealing piece 40 to move back and forth along the second direction to approach or move away from the first heat sealing piece 30, so as to heat seal the plastic bag in the clamping space, thereby completing the sealing of the plastic bag. The sealing mechanism of the plastic bag has simple structure, is convenient to operate, has high degree of automation, fast heat sealing speed, beautiful sealing, and effectively reduces the accident rate, improves the production efficiency and the sealing quality.

[0030] In a possible implementation, the rotating arm 22 comprises a first connecting arm 222, a second connecting arm 223, and a rotating plate 221, the rotating plate 221 is rotatably connected to the connecting plate 12 through a rotating shaft, the first connecting arm 222 and the second connecting arm 223 are symmetrically arranged at the center of the rotating plate 221, one end of the first connecting arm 222 is connected to the output shaft of the driving member 21, the other end of the first connecting arm 222 is rotatably connected to one end of the rotating plate 221, one end of the second connecting arm 223 is rotatably connected to the other end of the rotating plate 221, and the other end of the second connecting arm 223 is connected to the second heat sealing member 40. That is, when one end of the plastic bag is placed between the first heat sealing member 30 and the second heat sealing member 40, the first connecting arm 222 is driven to swing by the driving member 21, and then the rotating plate 221 is pushed to move on the connecting plate 12. Since the second connecting arm 223 is connected between the rotating plate 221 and the second heat sealing member 40, and the second connecting arm 223 can rotate relative to the rotating plate 221, the second connecting arm 223 swings to drive the second heat sealing member 40 to move back and forth during the rotation of the rotating plate 221, so that the plastic bag in the clamping space is clamped and sealed by the heating of the first heat sealing member 30 and the second heat sealing member 40. The structure is simple, the operation is convenient, manual auxiliary operation is not required, and the labor intensity is reduced.

[0031] In a possible implementation, two slide rods 70 extending in the second direction and symmetrically arranged are further included, the slide rods 70 are arranged on the inner side of the corresponding side plates 11, at least part of the slide rods 70 extends out of the front end of the side plates 11, two ends of the second heat sealing member 40 are slidably connected to the two slide rods 70, and two ends of the first heat sealing member 30 are slidably connected to the front ends of the two slide rods 70. In this way, when the driving member 21 drives the second heat sealing member 40 to move back and forth, the movement of the second heat sealing member 40 in the predetermined direction (i.e., the second direction) can be ensured, and the second heat sealing member 40 cannot be abutted with the first heat sealing member 30 due to deviation, so that the heat sealing effect is not good.

[0032] In a possible implementation, a limiting plate 50 and an elastic member 60 are further included, two ends of the limiting plate 50 are fixedly connected to the front ends of the slide rods 70 and are located on the outer side of the first heat sealing member 30, and the elastic member 60 is sleeved on the slide rods 70 and is located between the limiting plate 50 and the first heat sealing member 30. In this way, when the second heat sealing member 40 moves in the direction of the first heat sealing member 30 and clamps the plastic bag, the first heat sealing member 30 is slid on the slide rods 70 under the extrusion force, and then the elastic member 60 is compressed, so that a certain buffering effect can be achieved, and the second heat sealing member 40 is prevented from being damaged due to collision with the first heat sealing member 30. In addition, the elastic member 60 can be a spring, but is not limited thereto.

[0033] In one possible implementation, the first heat sealing member 30 comprises a first heat sealing strip 31, a first mounting plate 32 and a first heating rod 33. The two ends of the first mounting plate 32 are slidably connected to the front ends of the two slide rods 70. The first heat sealing strip 31 is connected to the side of the first mounting plate 32 facing the second heat sealing member 40. The first heating rod 33 is embedded in the first heat sealing strip 31 along the first direction. The surface of the first heat sealing strip 31 facing the second heat sealing member 40 is the first heat sealing surface. That is, after the first heat sealing member 30 and the second heat sealing member 40 clamp one end of the plastic bag in the clamping space, the first heating rod 33 is controlled to heat, so that the generated heat is conducted to the first heat sealing strip 31, thereby achieving heat sealing of the plastic bag.

[0034] In one possible implementation, a plurality of first heat insulation pads 80 are further provided. The first heat insulation pads 80 are arranged at intervals between the first heat sealing strip 31 and the first mounting plate 32. The two ends of each first heat insulation pad 80 are connected to the first heat sealing strip 31 and the first mounting plate 32 respectively. In this way, the first heat sealing strip 31 and the first mounting plate 32 are separated by the first heat insulation pads 80, so as to avoid heat conduction from the first heat sealing strip 31 to the first mounting plate 32, thereby preventing heat loss and improving the heat sealing effect of the plastic bag.

[0035] In one possible implementation, the second heat sealing member 40 comprises a second heat sealing strip 41, a second mounting plate 42 and a second heating rod 43. The two ends of the second mounting plate 42 are slidably connected to the two slide rods 70. The second heat sealing strip 41 is connected to the side of the second mounting plate 42 facing the first heat sealing member 30. The second heating rod 43 is embedded in the second heat sealing strip 41 along the first direction. The surface of the second heat sealing strip 41 facing the first heat sealing member 30 is the second heat sealing surface. That is, after the first heat sealing member 30 and the second heat sealing member 40 clamp one end of the plastic bag in the clamping space, the second heating rod 43 is controlled to heat, so that the generated heat is conducted to the second heat sealing strip 41, thereby achieving heat sealing of the plastic bag.

[0036] In one possible implementation, a plurality of second heat insulation pads 90 are further provided. The second heat insulation pads 90 are arranged at intervals between the second heat sealing strip 41 and the second mounting plate 42. The two ends of each second heat insulation pad 90 are connected to the second heat sealing strip 41 and the second mounting plate 42 respectively. In this way, the second heat sealing strip 41 and the second mounting plate 42 are separated by the second heat insulation pads 90, so as to avoid heat conduction from the second heat sealing strip 41 to the second mounting plate 42, thereby preventing heat loss and improving the heat sealing effect of the plastic bag.

[0037] The above merely is the preferred implementation form of the present application, and it should be noted that, for the ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and substitutions can be made, and these improvements and substitutions should also be considered as the protection scope of the present application.

Claims

1. A closure mechanism for a plastic bag, characterized in that The utility model relates to a sealing device for plastic bags, comprising: a sealing frame including two side plates arranged symmetrically and a connecting plate across between the two side plates; a sealing assembly including a first heat sealing piece arranged outside one end of the side plate along a first direction and a second heat sealing piece arranged between the two side plates along the first direction and forming a clamping space with the first heat sealing piece for clamping a plastic bag to be sealed; a driving assembly including a driving piece and a rotating arm, one end of the rotating arm being connected with the second heat sealing piece, the other end of the rotating arm being connected with an output shaft of the driving piece, the driving piece being used to drive the rotating arm to rotate so as to drive the second heat sealing piece to move back and forth along a second direction to approach or move away from the first heat sealing piece; the second direction being perpendicular to the first direction.

2. The closure mechanism for a plastic bag according to claim 1, wherein the rotating arm including a first connecting arm, a second connecting arm and a rotating plate, the rotating plate being rotatably connected with the connecting plate through a rotating shaft, the first connecting arm and the second connecting arm being arranged symmetrically with the center of the rotating plate, one end of the first connecting arm being connected with the output shaft of the driving piece, the other end of the first connecting arm being rotatably connected with one end of the rotating plate, one end of the second connecting arm being rotatably connected with the other end of the rotating plate, the other end of the second connecting arm being connected with the second heat sealing piece.

3. The closure mechanism for a plastic bag of claim 2, wherein, two slide rods extending along the second direction and arranged symmetrically, the slide rods being arranged inside the corresponding side plates and at least part of the slide rods extending out of the front end of the side plates, two ends of the second heat sealing piece being slidably connected with the two slide rods, two ends of the first heat sealing piece being slidably connected with the front end of the two slide rods.

4. The closure mechanism for a plastic bag according to claim 3, wherein a limiting plate and an elastic piece, two ends of the limiting plate being fixedly connected with the front end of the slide rods and located outside the first heat sealing piece, the elastic piece being sleeved on the slide rods and located between the limiting plate and the first heat sealing piece.

5. The closure mechanism for a plastic bag of claim 3, wherein, the first heat sealing piece including a first heat sealing strip, a first mounting plate and a first heating rod, two ends of the first mounting plate being slidably connected with the front end of the two slide rods, the first heat sealing strip being connected with one side of the first mounting plate facing the second heat sealing piece, the first heating rod being built in the first heat sealing strip along the first direction, the surface of the first heat sealing strip facing the second heat sealing piece being a first heat sealing surface.

6. The closure mechanism for a plastic bag according to claim 5, wherein, a plurality of first heat insulation pads arranged at intervals, the first heat insulation pads being located between the first heat sealing strip and the first mounting plate and two ends of the first heat insulation pads being connected with the first heat sealing strip and the first mounting plate respectively.

7. The closure mechanism for a plastic bag of claim 3, wherein, the second heat sealing piece including a second heat sealing strip, a second mounting plate and a second heating rod, two ends of the second mounting plate being slidably connected with the two slide rods, the second heat sealing strip being connected with one side of the second mounting plate facing the first heat sealing piece, the second heating rod being built in the second heat sealing strip along the first direction, the surface of the second heat sealing strip facing the first heat sealing piece being a second heat sealing surface.

8. The closure mechanism for a plastic bag according to claim 7, wherein, The second heat insulation pad is arranged between the second heat sealing strip and the second mounting plate, and two ends of the second heat insulation pad are connected with the second heat sealing strip and the second mounting plate respectively.

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