Thermoplastic packaging device

Abstract

The utility model provides a thermal plastic packaging device which comprises a bearing part and a hot welding part, the bearing part is used for bearing a packaging bag to be sealed, the hot welding part and the bearing part are arranged in a relative movement mode, the hot welding part comprises a welding seat and a heating structure arranged in a containing hole of the welding seat, and the two opposite ends of the welding seat are a driving end and a welding end respectively. The heating structure is close to the welding end relative to the driving end; the welding end is pressed against the opening position of the packaging bag located on the bearing part to achieve sealing. In the scheme, due to the fact that the heating structure is arranged inside the welding base instead of the end portion, the problem that the heating temperature of the welding end is too high is avoided, the packaging bag is not prone to being completely welded, and the sealing quality and the yield are improved. And moreover, the heating structure is closer to the welding end relative to the driving end of the welding seat, so that the heating speed of the welding end is high, and compared with the scheme that the heating structure is arranged at the driving end, the heat transfer distance is short, and the heating waiting time is shortened.

Description

Technical Field

[0001] The utility model relates to the technical field of packaging equipment, in particular to a thermal plastic sealing device. Background Art

[0002] Medical accessories are medical devices and need to be kept in a sterile, dust-free environment. After assembly, medical accessories need to be directly bagged and sealed to avoid contamination.

[0003] The existing thermoplastic sealing device for medical accessories heat-welds the opening of the packaging bag through the heat welding part when sealing the packaging bag, so as to achieve sealing. In the existing thermoplastic sealing device, a heating wire is arranged outside the end of the heat welding part to heat and weld the opening. This method has a fast heating speed, but is close to the packaging bag, which easily causes the packaging bag to be welded through due to excessive temperature, thereby reducing the sealing quality and affecting the yield rate. Utility Model Content

[0004] The utility model provides a thermal plastic sealing device to improve the sealing quality of packaging bags.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a heat plastic sealing device, comprising: a bearing part, used to bear the packaging bag to be sealed; a heat welding part, which is arranged to be relatively movably with the bearing part, and the heat welding part comprises a welding seat and a heating structure, the welding seat has a receiving hole extending along its own length direction, the heating structure penetrates into the receiving hole, the opposite ends of the welding seat are respectively a driving end and a welding end, and the heating structure is close to the welding end relative to the driving end; wherein the welding end is sealed by pressing against the opening position of the packaging bag located on the bearing part.

[0006] Furthermore, the welding seat includes a pressing plate and welding ribs protruding from the pressing plate, the heating structure is located inside the pressing plate, and the welding ribs form welding ends.

[0007] Furthermore, in the thickness direction of the pressing plate, the width of the welding rib is smaller than the thickness of the pressing plate; the welding rib is arranged along the length direction of the pressing plate, and the welding rib is straight line-shaped, broken line-shaped or wavy.

[0008] Furthermore, the heat welding part also includes a connecting seat, the driving end of the welding seat and the connecting seat are detachably connected, and the connecting seat is used to connect to the driving structure, and the driving structure drives the heat welding part to move back and forth.

[0009] Furthermore, the driving end of the welding seat has a limiting groove, and the connecting seat can be pulled out and inserted into the limiting groove to achieve limiting cooperation; or, the connecting seat has a limiting groove, and the welding seat can be pulled out and inserted into the limiting groove to achieve limiting cooperation.

[0010] Furthermore, the limit groove is located on the welding seat, and the limit groove includes a wide groove and a narrow groove that are interconnected, and the wide groove and the narrow groove form a T-shaped groove. The connecting seat includes a connecting plate and a limit piece protruding from the connecting plate; in the thickness direction of the connecting plate, the size of the limit piece is greater than the width of the narrow groove; wherein the limit piece penetrates into the wide groove, and the connecting plate penetrates into the narrow groove.

[0011] Furthermore, the hot welding part also includes a detachable fastener, and when the welding seat and the connecting seat are matched through the limiting groove, the fastener fixes the welding seat and the connecting seat.

[0012] Furthermore, the hot welding part also includes a temperature sensor, which is arranged on the welding seat and is used to detect the temperature of the welding end.

[0013] Furthermore, the thermoplastic sealing device also includes a bracket, an upper cylinder and a lower cylinder, the upper cylinder and the lower cylinder are both arranged on the bracket, the bearing part is installed on the lower cylinder, the heat welding part is installed on the upper cylinder, and the heat welding part is located above the bearing part; the bearing part includes a bearing seat and a bearing plate connected to each other, the bearing seat and the welding seat are arranged opposite to each other, the bearing plate is used to bear the main body of the packaging bag, and the bearing seat is used to bear the opening position of the packaging bag.

[0014] Furthermore, the thermoplastic sealing device also includes an exposure detection part, which is used to detect whether the material in the packaging bag extends out to the opening position; the exposure detection part includes a support, a touch structure and a position sensor, the position sensor is fixed to the support, and the touch structure is liftably arranged on the support; wherein, the lower end of the touch structure contacts the opening position of the packaging bag, and when the material in the packaging bag extends out to the opening position, the touch structure is lifted up and triggers the position sensor to send out sensing information.

[0015] Further, the trigger structure includes a detection plate, the size of the detection plate matches the opening width of the packaging bag, the detection plate contacts the opening position of the packaging bag located on the bearing part for detection, and the exposed detection part also includes a lifting cylinder, which drives the support to rise and fall; or, the exposed detection part also includes a support plate, the trigger structure includes a pressure block and a roller, the roller is rotatably arranged on the pressure block, the opening position of the packaging bag moves on the support plate along its own width direction, and the roller contacts the opening position of the packaging bag located on the support plate for detection.

[0016] The technical scheme of the utility model is applied to provide a heat plastic sealing device, including a bearing part and a heat welding part, the bearing part is used to bear the packaging bag to be sealed, the heat welding part and the bearing part can be relatively movably arranged, the heat welding part includes a welding seat and a heating structure, the welding seat has a receiving hole extending along its length direction, the heating structure penetrates the receiving hole, the two opposite ends of the welding seat are respectively a driving end and a welding end, the heating structure is close to the welding end relative to the driving end; wherein, the welding end is sealed by pressing against the opening position of the packaging bag located on the bearing part. In this scheme, the welding end of the welding seat is heated by the heating structure, so that the opening of the packaging bag is welded by the welding end. Since the heating structure is arranged inside the welding seat instead of the end, the heating temperature of the welding end is avoided to be too high, so that the problem of welding the packaging bag through is not likely to occur, and the sealing quality and yield rate are improved. In addition, the heating structure is closer to the welding end relative to the driving end of the welding seat, so that the heating speed of the welding end is fast. Compared with the scheme of arranging the heating structure at the driving end, the heat transfer distance is short, and the heating waiting time is reduced. Furthermore, the heating structure is arranged in a receiving hole extending along the length direction of the welding seat, and can heat different positions along the length direction of the welding seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0018] Figure 1 A schematic diagram of a heat-plastic sealing device provided in an embodiment of the utility model is shown;

[0019] Figure 2 Another view of the heat-plastic sealing device provided by an embodiment of the utility model is shown;

[0020] Figure 3 Shows Figure 1 A three-dimensional diagram of the heat welding part;

[0021] Figure 4 Shows Figure 1 A bottom view of the heat welded portion;

[0022] Figure 5 Shows Figure 4 A cross-sectional view of the heat welded portion at position AA;

[0023] Figure 6 Shows Figure 1 A schematic diagram of an exposed detection portion;

[0024] Figure 7 A schematic diagram of another exposed detection portion provided by an embodiment of the utility model is shown.

[0025] The above drawings include the following reference numerals:

[0026] 10. Bearing part;

[0027] 11. Bearing seat;

[0028] 12. Loading plate;

[0029] 20. Hot welding part;

[0030] 21. welding seat; 211. pressing plate; 212. welding rib; 213. limiting groove;

[0031] 22. Heating structure;

[0032] 23. Connecting seat; 231. Connecting plate; 232. Limiting member;

[0033] 24. Temperature sensor;

[0034] 30. Bracket;

[0035] 40. Upper cylinder;

[0036] 50. Lower cylinder;

[0037] 60. Exposed detection unit;

[0038] 61. Support;

[0039] 62, trigger structure; 621, detection plate; 622, pressure block; 623, roller;

[0040] 63. Position sensor;

[0041] 64. Lifting cylinder;

[0042] 65. Support plate. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0044] like Figures 1 to 7As shown, an embodiment of the utility model provides a heat plastic sealing device, comprising: a bearing portion 10, used for bearing a packaging bag to be sealed; a heat welding portion 20, which is arranged to be relatively movably with the bearing portion 10, and the heat welding portion 20 includes a welding seat 21 and a heating structure 22, the welding seat 21 has a receiving hole extending along its own length direction, the heating structure 22 penetrates the receiving hole, the opposite ends of the welding seat 21 are respectively a driving end and a welding end, and the heating structure 22 is close to the welding end relative to the driving end; wherein the welding end is sealed by pressing against the opening position of the packaging bag located on the bearing portion 10.

[0045] In this solution, the welding end of the welding seat 21 is heated by the heating structure 22, so that the opening of the packaging bag is welded by the welding end. Since the heating structure 22 is arranged inside the welding seat 21 instead of the end, the heating temperature of the welding end is avoided to be too high, so that the problem of welding through the packaging bag is not likely to occur, and the sealing quality and yield rate are improved. In addition, the heating structure 22 is closer to the welding end relative to the driving end of the welding seat 21, so the heating speed of the welding end is fast. Compared with the solution of arranging the heating structure at the driving end, the heat transfer distance is short, and the heating waiting time is reduced.

[0046] In addition, the welding seat 21 has a receiving hole extending along its length direction, and the heating rod is inserted into the receiving hole. That is, the heating rod is arranged along the length direction of the welding seat 21 to heat different positions along the length direction of the welding seat 21. Among them, the length of the welding end of the welding seat 21 matches the opening width of the packaging bag to ensure that the entire opening is welded and sealed.

[0047] Specifically, the heating structure 22 is a heating rod, which is an existing mature product with low cost and high heating efficiency.

[0048] like Figures 3 to 5 As shown, the welding seat 21 includes a pressing plate 211 and a welding rib 212 protruding from the pressing plate 211. The heating structure 22 is located in the pressing plate 211, and the welding rib 212 forms a welding end. By providing the protruding welding rib 212, on the one hand, heat can be concentrated to the welding rib 212 to improve energy utilization, and on the other hand, it can ensure that the welding rib 212 and the packaging bag can fully contact to ensure the welding effect.

[0049] Specifically, in the thickness direction of the pressing plate 211 , the width of the welding rib 212 is smaller than the thickness of the pressing plate 211 , which is beneficial for concentrating the heat of the heating structure 22 on the welding rib 212 .

[0050] The welding ribs 212 are arranged along the length direction of the pressing plate 211, which is also the width direction of the opening of the packaging bag. The welding ribs 212 are straight, folded or wavy, and can also be arranged in other shapes, depending on actual needs.

[0051] In this solution, the hot welding part 20 further includes a connecting seat 23, and the driving end of the welding seat 21 and the connecting seat 23 are detachably connected. The connecting seat 23 is used to connect the driving structure, and the driving structure drives the hot welding part 20 to move back and forth. The driving structure can be an electric or pneumatic structure. The driving end of the welding seat 21 and the connecting seat 23 are detachably connected, which facilitates the maintenance or replacement of the welding seat 21 or the heating structure 22 separately.

[0052] like Figure 3 As shown, the driving end of the welding seat 21 has a limiting groove 213, and the connecting seat 23 can be pulled out and inserted into the limiting groove 213 to achieve limiting cooperation; or in an embodiment not shown in the figure, the connecting seat 23 has a limiting groove 213, and the welding seat 21 can be pulled out and inserted into the limiting groove 213 to achieve limiting cooperation. In this solution, the welding seat 21 and the connecting seat 23 are connected and disassembled by plugging and unplugging, which is easy to operate.

[0053] like Figure 5 As shown, the limiting groove 213 is located at the welding seat 21, and the limiting groove 213 includes a wide groove and a narrow groove that are interconnected, and the wide groove and the narrow groove form a T-shaped groove. The connecting seat 23 includes a connecting plate 231 and a limiting member 232 protruding from the connecting plate 231; in the thickness direction of the connecting plate 231, the size of the limiting member 232 is greater than the width of the narrow groove; wherein the limiting member 232 penetrates into the wide groove, and the connecting plate 231 penetrates into the narrow groove. In this way, after the connecting seat 23 is inserted into the limiting groove 213 of the welding seat 21, the welding seat 21 and the connecting seat 23 are reliably limited in the depth direction of the limiting groove 213, that is, the reciprocating movement direction of the welding seat 21. Specifically, the limiting member 232 can be a bolt, and the screw rod is connected to the connecting plate 231. The nut of the bolt is exposed from the connecting plate 231, and the limiting is achieved by the nut penetrating into the wide groove.

[0054] In this solution, the hot welding part 20 also includes a detachable fastener, and when the welding seat 21 and the connecting seat 23 are matched through the limiting groove 213, the fastener fixes the welding seat 21 and the connecting seat 23. The fastener further improves the connection reliability of the welding seat 21 and the connecting seat 23.

[0055] Specifically, the fastener may be a bolt, the insertion direction of the bolt is the thickness direction of the connection seat 23, and a plurality of bolts may be used.

[0056] like Figure 3 and Figure 4 As shown, the hot welding part 20 also includes a temperature sensor 24, which is arranged on the welding seat 21. The temperature sensor 24 is used to detect the temperature of the welding end. In this way, it is possible to detect in real time whether the temperature of the welding end meets the welding requirements. If the temperature is too high or too low, the heating condition of the heating structure 22 is adjusted in time to make the welding end reach a suitable temperature.

[0057] like Figure 1 and Figure 2 As shown, the heat plastic sealing device also includes a bracket 30, an upper cylinder 40 and a lower cylinder 50. The upper cylinder 40 and the lower cylinder 50 are both arranged on the bracket 30. The bearing part 10 is installed on the lower cylinder 50. The heat welding part 20 is installed on the upper cylinder 40, and the heat welding part 20 is located above the bearing part 10. The upper cylinder 40 drives the heat welding part 20 to move back and forth to achieve the sealing operation of the opening of the packaging bag. The lower cylinder 50 drives the bearing part 10 to rise and fall, and the lifting and falling of the bearing part 10 cooperates with the heat welding part 20 or the mechanism for conveying the packaging bag.

[0058] The bearing part 10 includes a bearing seat 11 and a bearing plate 12 connected to each other. The bearing seat 11 and the welding seat 21 are arranged opposite to each other. The bearing plate 12 is used to bear the main body of the packaging bag, and the bearing seat 11 is used to bear the opening position of the packaging bag. In this way, the packaging bag can be carried to keep the packaging bag in a certain position, so as to cooperate with the heat welding part 20 to achieve sealing. The height of the bearing seat 11 is higher than the bearing plate 12, so that the opening position of the packaging bag can be in full contact with the heat welding part 20 to ensure the sealing quality. A buffer structure such as a silicone pad can be set on the bearing seat 11 to reduce the impact during welding and play a buffering effect.

[0059] Furthermore, in this solution, the heat-plastic sealing device further includes an exposure detection unit 60, which is used to detect whether the material (e.g., an infusion tube) in the packaging bag extends to the opening position. When it is detected that the material in the packaging bag extends to the opening position, the sealing operation cannot be performed to avoid obtaining defective products. When it is detected that the material in the packaging bag does not extend out of the opening, the sealing operation is performed. Therefore, the yield rate is improved by the exposure detection unit 60.

[0060] The exposure detection unit 60 includes a support 61, a trigger structure 62 and a position sensor 63. The position sensor 63 is fixed to the support 61, and the trigger structure 62 is movably disposed on the support 61. The lower end of the trigger structure 62 contacts the opening position of the packaging bag. When the material in the packaging bag extends to the opening position, the trigger structure 62 is lifted up and triggers the position sensor 63 to send out sensing information. When the material in the packaging bag extends to the opening position, the thickness of the opening position is relatively thick, and the material here will lift up the trigger structure 62, and the trigger structure 62 triggers the position sensor 63 to send out sensing information, thereby detecting that the material in the packaging bag extends to the opening position. In this case, the heat welding unit 20 does not perform a sealing operation.

[0061] Specifically, Figure 6As shown, in a specific embodiment, the trigger structure 62 includes a detection plate 621, the size of the detection plate 621 matches the opening width of the packaging bag, and the detection plate 621 contacts the opening position of the packaging bag on the load-bearing part 10 for detection. The exposure detection part 60 also includes a lifting cylinder 64, and the lifting cylinder 64 drives the support 61 to rise and fall. The lifting cylinder 64 makes the detection plate 621 of the support 61 rise and fall within a preset height range. After the detection plate 621 descends, it contacts the opening position of the packaging bag. If the material in the packaging bag is not exposed, the detection plate 621 will not move upward. If the material in the packaging bag is exposed, the detection plate 621 is lifted by the material, thereby triggering the position sensor 63 to send out sensing information. In this embodiment, the trigger structure 62 is used in combination with the load-bearing part 10, that is, the trigger structure 62 detects the packaging bag on the load-bearing part 10.

[0062] Or, if Figure 7 As shown, in another embodiment, the exposure detection unit 60 further includes a support plate 65, and the trigger structure 62 includes a pressing block 622 and a roller 623. The roller 623 is rotatably arranged on the pressing block 622. The opening position of the packaging bag moves on the support plate 65 along its width direction, and the roller 623 contacts the opening position of the packaging bag on the support plate 65 for detection. In this way, when the opening position of the packaging bag moves on the support plate 65, if there is material exposed, the material will lift the roller 623 and the pressing block 622, thereby triggering the position sensor 63 to send out sensing information, thereby realizing the detection function. By setting the roller 623, the resistance when contacting the packaging bag can be reduced.

[0063] In this solution, the bearing part 10 and the heat welding part 20 can be provided in multiple groups, for example Figure 1 There are two groups, each of which has a bearing portion 10 and a heat welding portion 20 corresponding to each other, and multiple groups of structures act synchronously, so that multiple packaging bags can be sealed at the same time, thereby improving operation efficiency.

[0064] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

[0065] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0066] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being only exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0067] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0068] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0069] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only to facilitate the distinction between corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

Claims

1. A heat-plastic sealing device, characterized in that: include: A carrying portion (10) for carrying a packaging bag to be sealed; The heat welding part (20) is arranged to be relatively movable with the bearing part (10), and the heat welding part (20) comprises a welding seat (21) and a heating structure (22). The welding seat (21) has a receiving hole extending along its length direction, and the heating structure (22) penetrates into the receiving hole. The two opposite ends of the welding seat (21) are respectively a driving end and a welding end, and the heating structure (22) is close to the welding end relative to the driving end; wherein the welding end is sealed by pressing against the opening position of the packaging bag located on the bearing part (10).

2. The heat-plastic sealing device according to claim 1, characterized in that: The welding seat (21) comprises a pressing plate (211) and a welding rib (212) protruding from the pressing plate (211); the heating structure (22) is located inside the pressing plate (211); and the welding rib (212) forms the welding end.

3. The heat-plastic sealing device according to claim 2, characterized in that: In the thickness direction of the pressing plate (211), the width of the welding rib (212) is smaller than the thickness of the pressing plate (211); The welding ribs (212) are arranged along the length direction of the pressing plate (211), and the welding ribs (212) are in a straight line shape, a broken line shape, or a wave shape.

4. The heat-plastic sealing device according to claim 1, characterized in that: The heat welding part (20) further comprises a connecting seat (23); a driving end of the welding seat (21) and the connecting seat (23) are detachably connected; the connecting seat (23) is used to connect to a driving structure; the driving structure drives the heat welding part (20) to move back and forth.

5. The heat-plastic sealing device according to claim 4, characterized in that: The driving end of the welding seat (21) has a limiting groove (213), and the connecting seat (23) can be pulled out and inserted into the limiting groove (213) to achieve limiting fit; or, The connecting seat (23) has a limiting groove (213), and the welding seat (21) can be pulled out and inserted into the limiting groove (213) to achieve limiting fit.

6. The heat-plastic sealing device according to claim 5, characterized in that: The limiting groove (213) is located on the welding seat (21), and the limiting groove (213) comprises a wide groove and a narrow groove that are interconnected, and the wide groove and the narrow groove form a T-shaped groove. The connecting seat (23) comprises a connecting plate (231) and a limiting member (232) protruding from the connecting plate (231); in the thickness direction of the connecting plate (231), the size of the limiting member (232) is greater than the width of the narrow groove; wherein the limiting member (232) penetrates into the wide groove, and the connecting plate (231) penetrates into the narrow groove.

7. The heat-plastic sealing device according to claim 5, characterized in that: The hot welding portion (20) further comprises a detachable fastener, and when the welding seat (21) and the connecting seat (23) are matched via the limiting groove (213), the fastener fixes and connects the welding seat (21) and the connecting seat (23).

8. The heat-plastic sealing device according to claim 1, characterized in that: The hot welding part (20) further comprises a temperature sensor (24), wherein the temperature sensor (24) is arranged on the welding seat (21), and the temperature sensor (24) is used to detect the temperature of the welding end.

9. The heat-plastic sealing device according to claim 1, characterized in that: The heat-plastic sealing device further comprises a support (30), an upper cylinder (40) and a lower cylinder (50), wherein the upper cylinder (40) and the lower cylinder (50) are both arranged on the support (30), the bearing part (10) is mounted on the lower cylinder (50), the heat welding part (20) is mounted on the upper cylinder (40), and the heat welding part (20) is located above the bearing part (10); The bearing portion (10) comprises a bearing seat (11) and a bearing plate (12) which are connected to each other, the bearing seat (11) and the welding seat (21) are arranged relative to each other, the bearing plate (12) is used to bear the main body of the packaging bag, and the bearing seat (11) is used to bear the opening position of the packaging bag.

10. The heat-plastic sealing device according to claim 1, characterized in that: The heat-plastic sealing device further comprises an exposure detection unit (60), the exposure detection unit (60) being used to detect whether the material in the packaging bag extends out to the opening position; the exposure detection unit (60) comprises a support (61), a trigger structure (62) and a position sensor (63), the position sensor (63) being fixed to the support (61), and the trigger structure (62) being movably arranged on the support (61); wherein the lower end of the trigger structure (62) contacts the opening position of the packaging bag, and when the material in the packaging bag extends out to the opening position, the trigger structure (62) is lifted up and triggers the position sensor (63) to send out sensing information.

11. The heat-plastic sealing device according to claim 10, characterized in that: The trigger structure (62) comprises a detection plate (621), the size of the detection plate (621) matches the opening width of the packaging bag, the detection plate (621) contacts the opening position of the packaging bag on the bearing portion (10) for detection, and the exposed detection portion (60) further comprises a lifting cylinder (64), and the lifting cylinder (64) drives the support (61) to rise and fall; or, The exposure detection portion (60) further comprises a support plate (65), the trigger structure (62) comprises a pressing block (622) and a roller (623), the roller (623) being rotatably arranged on the pressing block (622), the opening position of the packaging bag moving on the support plate (65) along its width direction, and the roller (623) contacting the opening position of the packaging bag located on the support plate (65) for detection.

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