Packaging bag clamping mechanism

Abstract

The utility model belongs to the field of packaging bag clamps, and discloses a packaging bag clamping mechanism which comprises a plurality of sets of clamp assemblies arranged side by side, and each clamp assembly comprises a first clamp and a second clamp which are arranged in pairs; the first guide transmission shaft and the second guide transmission shaft extend in the arrangement direction of the clamp assemblies, the first clamp is connected with the first guide transmission shaft and is in sliding fit with the second guide transmission shaft, and the second clamp is connected with the second guide transmission shaft and is in sliding fit with the first guide transmission shaft; and a driving mechanism. According to the utility model, the clamp I and the clamp II of each clamp assembly can be synchronously driven to adjust the distance, and the guide transmission shaft I and the guide transmission shaft II play a role in guiding the clamp assemblies during transmission, so that one rod has multiple purposes, the structure is more compact, the transmission is more stable, and the production efficiency is improved. And meanwhile, the complexity of a transmission structure is also reduced.

Description

Technical Field

[0001] This utility model belongs to the field of packaging bag clamping technology, specifically relating to a packaging bag clamping mechanism. Background Technology

[0002] Packaging machines require clamping mechanisms to temporarily secure packaging bags containing materials. These mechanisms use multiple grippers to open and close, holding or releasing the bags. The expansion and contraction of the bags is achieved through a transmission rod with multiple forward and reverse threads, working in conjunction with a guide rod. Each threaded segment connects to a pair of grippers; the forward and reverse rotation of the transmission rod moves the grippers in opposite directions, thus expanding and contracting the bag. However, this expansion and contraction drive mechanism has poor transmission stability, is complex, and has a high cost. Utility Model Content

[0003] In view of this, the purpose of this utility model is to provide a packaging bag clamping mechanism to solve the problem of poor transmission stability of existing packaging bag clamping mechanisms.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A packaging bag clamping mechanism, comprising:

[0006] Several sets of clamping assemblies arranged side by side, the clamping assemblies including a pair of clamps, clamp one and clamp two;

[0007] Guide drive shaft one and guide drive shaft two are arranged extending along the arrangement direction of the clamp assembly. The clamp one is connected to the guide drive shaft one and slides in cooperation with the guide drive shaft two. The clamp two is connected to the guide drive shaft two and slides in cooperation with the guide drive shaft one.

[0008] A drive mechanism is connected to at least one set of clamping assemblies to movably adjust the distance between clamp one and clamp two of the set of clamping assemblies.

[0009] In a possible implementation, the drive mechanism includes a lead screw with a first threaded section and a second threaded section, the threads of the first threaded section and the second threaded section being opposite, the first threaded section being screwed into a clamp, and the second threaded section being screwed into a clamp.

[0010] Alternatively, the driving mechanism includes a scissor telescopic member with a central hinge point fixed, and the two ends of the scissor telescopic member are respectively connected to clamp one and clamp two;

[0011] Alternatively, the drive mechanism includes a transmission gear and a gear drive shaft, with two gear drive shafts meshing symmetrically on both sides of the transmission gear, and the two gear drive shafts are respectively connected to clamp one and clamp two.

[0012] In a possible implementation, two guide drive shafts are provided for each of the first and second guide drive shafts;

[0013] The first guide drive shaft and the second guide drive shaft are arranged in a rectangular array, and the two first guide drive shafts are located at opposite corners of the rectangular array.

[0014] Alternatively, the first guide shaft and the second guide shaft are arranged in a linear array, with the two first guide shafts in the middle and the two second guide shafts at both ends, or the first guide shaft and the second guide shaft are arranged in an alternating pattern in the direction of the linear array distribution.

[0015] In one possible implementation, the first clamp is provided with a lubricating bushing for sliding engagement with the second guide shaft, and the second clamp is provided with a lubricating bushing for sliding engagement with the first guide shaft.

[0016] In a possible implementation, both clamp one and clamp two include clamp arm one and clamp arm two. Clamp arm one has a first sliding surface, and clamp arm two has a second sliding surface that abuts and cooperates with the first sliding surface to slide along the clamping direction. A sliding limiting mechanism is provided between the first sliding surface and the second sliding surface to allow clamp arm one and clamp arm two to slide and open and close along the clamping direction.

[0017] In a possible implementation, the sliding limiting mechanism includes a support portion and a limiting slide hole. The support portion is disposed on one of the first sliding surface and the second sliding surface, and the limiting slide hole is disposed on the other of the first sliding surface and the second sliding surface. The limiting slide hole extends along a first direction parallel to the clamping direction, and the support portion is slidably fitted within the limiting slide hole.

[0018] In a possible implementation, both clamping arm one and clamping arm two are provided with clamping parts, and the clamping parts are provided with anti-slip structures.

[0019] In a possible implementation, an elastic element is provided between the first clamping arm and the second clamping arm. The direction of action of the elastic element is parallel to the clamping direction of the clamping part, so that one clamping part is reset and switched between the closed and open positions relative to the other clamping part.

[0020] In possible implementations, the support is a pulley or a slider, and the limiting sliding hole is a blind hole.

[0021] In a possible implementation, the limiting sliding holes and support portions are provided in multiple sets at intervals along the first direction on the fixture.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The packaging bag clamping mechanism of this utility model is connected and movable with clamps one and two respectively through guide transmission shaft one and guide transmission shaft two. When the drive mechanism drives clamps one and two of a set of clamping components to adjust the spacing, it can synchronously drive clamps one and two of each set of clamping components to adjust the spacing. In addition, guide transmission shaft one and guide transmission shaft two also guide the clamping components while transmitting. The multi-purpose mechanism makes the structure more compact, the transmission more stable, and also reduces the complexity of the transmission structure.

[0024] Moreover, by arranging multiple transmission guide shafts one and two in an array and in a diagonal or straight line arrangement, each clamp assembly is less prone to jamming when driven by transmission guide shafts one and two, resulting in smoother and more stable transmission.

[0025] Meanwhile, the clamps one and two of the clamp assembly are connected by a sliding limit mechanism, which allows clamp arm one and clamp arm to open and close. Furthermore, the sliding arrangement of clamp arm one and clamp arm two can effectively reduce the lateral dimension of the clamping mechanism and facilitate the setting of more clamping stations. Attached Figure Description

[0026] Figure 1 A perspective view of a packaging bag clamping mechanism;

[0027] Figure 2 A first-person perspective perspective view of a packaging bag clamping mechanism after the housing is concealed.

[0028] Figure 3 A second-view perspective perspective of a packaging bag clamping mechanism after the housing is concealed.

[0029] Figure 4 A partial perspective view of a packaging bag clamping mechanism using a scissor telescopic component for transmission;

[0030] Figure 5 A partial perspective view of a packaging bag clamping mechanism using a lead screw for transmission;

[0031] Figure 6 A partial perspective view of a packaging bag clamping mechanism using transmission gears and a gear transmission shaft for transmission;

[0032] Figure 7 This is a schematic diagram of the connection structure between guide drive shaft one and guide drive shaft two and the clamping assembly of a packaging bag clamping mechanism;

[0033] Figure 8 An exploded view of a clamping fixture assembly of a packaging bag clamping mechanism from a certain perspective;

[0034] Figure 9 An exploded view of a clamping fixture assembly of a packaging bag clamping mechanism from another perspective;

[0035] In the diagram: 1-Outer shell; 11-Opening; 2-Clamping assembly; 21-Clamping one; 22-Clamping two; 23-Clamping arm one; 24-Clamping arm two; 25-Connecting part; 26-Clamping part; 27-Spring; 28-Support part; 29-Limiting sliding hole; 210-Lubricating bushing; 3-Guide transmission shaft two; 4-Guide transmission shaft one; 5-Linkage rod; 6-Telescopic cylinder; 7-Scissor fork telescopic component; 8-Drive component; 9-Lead screw; 91-Threaded section one; 92-Threaded section two; 10-Synchronous transmission device; 101-Gear transmission shaft. Detailed Implementation

[0036] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to specific embodiments.

[0037] Please refer to Figures 1-9 As shown, an embodiment of this application provides a packaging bag clamping mechanism, comprising: a plurality of clamp assemblies 2 arranged side by side, each clamp assembly 2 including a pair of clamps 1 21 and clamp 22; a guide drive shaft 1 4 and a guide drive shaft 2 3 extending along the arrangement direction of the clamp assemblies 2, wherein clamp 1 21 is connected to guide drive shaft 1 4 and slides in cooperation with guide drive shaft 2 3, and clamp 2 22 is connected to guide drive shaft 2 3 and slides in cooperation with guide drive shaft 1 4; and a driving mechanism, which is connected to at least one set of clamp assemblies 2 to flexibly adjust the distance between clamp 1 21 and clamp 22 of that set of clamp assemblies 2.

[0038] The clamping assembly 2 can be set in one or more sets. Multiple clamping assemblies 2 are arranged side by side on the first guide drive shaft 4 and the second guide drive shaft 3, and move along the first guide drive shaft 4 and the second guide drive shaft 3. The first guide drive shaft 4 and the second guide drive shaft 3 can provide sliding guidance for the clamping assembly 2 and also provide displacement transmission for it. The rod has multiple uses, making the transmission structure more compact and the transmission more stable. Each clamp assembly 2 has a clamp 21 connected and fixed to a guide drive shaft 4 and slidingly engaged with a guide drive shaft 3, so that the clamp 21 can be moved by the guide drive shaft 4 but not by the guide drive shaft 3. Each clamp assembly 2 has a clamp 22 connected and fixed to a guide drive shaft 3 and slidingly engaged with a guide drive shaft 4, so that the clamp 22 can be moved by the guide drive shaft 3 but not by the guide drive shaft 3. In this way, the clamp 21 and clamp 22 can be moved by the transmission of the guide drive shaft 4 and the guide drive shaft 3, thereby realizing the adjustment of the distance between the clamp 21 and clamp 22. The drive mechanism is connected to the clamp assembly 2 and is used to drive clamp 1 21 and clamp 22 to move in opposite directions to adjust the spacing. Since each clamp 1 21 and clamp 22 is connected to guide drive shaft 1 4 and guide drive shaft 2 3 respectively, when one clamp assembly 2 is adjusting the spacing, clamp 1 21 and clamp 22 of other clamp assemblies 2 will move synchronously to adjust the spacing.

[0039] Through the above technical solution, the guide drive shaft 1 4 and guide drive shaft 2 3 are connected and movable with clamp 1 21 and clamp 2 22 respectively. When the drive mechanism drives clamp 1 21 and clamp 2 22 of a set of clamp assemblies 2 to adjust the spacing, the clamp 1 21 and clamp 2 22 of each set of clamp assemblies 2 can be synchronously driven to adjust the spacing. In addition, the guide drive shaft 1 4 and guide drive shaft 2 3 also guide the clamp assembly 2 while driving. The multi-purpose rod makes the structure more compact, the transmission more stable, and also reduces the complexity of the transmission structure.

[0040] In some embodiments, the drive mechanism is mainly used to drive clamp one 21 and clamp two 22 of a set of clamp assemblies 2 to move towards each other. It can employ different drive structures, such as a drive member 8 and a transmission member that can synchronously transmit power in opposite directions. Driven by the drive member 8, the two transmission ends of the transmission member move to drive clamp one 21 and clamp two 22. To fully illustrate the possible drive mechanisms, the following three embodiments are provided, including but not limited to:

[0041] In the first implementation structure of the drive mechanism, combined with Figure 5As shown, the driving mechanism includes a lead screw 9, which has a first threaded section 91 and a second threaded section 92. The threads of the first threaded section 91 and the second threaded section 92 are opposite. The first threaded section 91 is screwed into a clamp 21, and the second threaded section 92 is screwed into a clamp 22. In this embodiment, the two ends of the lead screw 9 are respectively provided with a first threaded section 91 and a second threaded section 92, and the two threads are opposite. The first threaded section 91 and the second threaded section 92 are respectively screwed into clamps 21 and clamp 22 of a clamp assembly 2. In this way, when the lead screw 9 rotates, it can synchronously drive clamps 21 and clamp 22 to move in opposite directions. The lead screw 9 can be driven to rotate in both directions by a driving component 8, such as a drive motor, thereby realizing the adjustment of the distance between clamps 21 and clamp 22 through the transmission of the lead screw 9. In the specific implementation process, since the lead screw 9 needs to be installed with the driving component 8, the driving mechanism of the lead screw 9 structure is preferably set at the end of the clamping mechanism, so as to facilitate the installation of the driving component 8.

[0042] In the second implementation structure of the drive mechanism, combined with Figure 4 As shown, the driving mechanism includes a scissor telescopic member 7 with a central hinge point fixed, and the two ends of the scissor telescopic member 7 are respectively connected to clamp 1 21 and clamp 22. In this implementation structure, a scissor lift telescopic member 7 is used as a transmission member. Each hinge point on the scissor lift telescopic member 7 can extend and retract synchronously. By utilizing this characteristic, it is used as a transmission member, and its two ends are respectively connected to clamp 1 21 and clamp 22 of a set of clamping assemblies 2. At the same time, its middle hinge point is fixed to the housing of the clamping mechanism. In this way, when any clamp 1 21 or clamp 22 moves, the other clamp will also move synchronously and in the opposite direction, which makes it easy to adjust the distance between clamp 1 21 and clamp 22. The driving member 8 can be set between any hinge point of the scissor lift telescopic member 7, such as using an electric telescopic rod. However, this will occupy internal space and is not convenient for maintenance. Therefore, preferably, the driving member 8 can be a linear driving component such as a screw or electric telescopic rod to drive clamp 1 21 of a set of clamping assemblies 2 at the end of the clamping mechanism to realize the distance adjustment of all clamping assemblies 2.

[0043] In the third implementation structure of the drive mechanism, combined with Figure 6As shown, the driving mechanism includes a centrally fixed transmission gear (not shown) and a gear transmission shaft 101. Two gear transmission shafts 101 mesh symmetrically on both sides of the transmission gear, and are respectively connected to clamp one 21 and clamp two 22. In this embodiment, the transmission gear meshes with the two gear transmission shafts 101, which have axially arranged transmission teeth that mesh with the transmission gear. When the transmission gear rotates, the upper and lower gear transmission shafts 101 move towards each other, thereby adjusting the distance between clamp one 21 and clamp two 22 of the clamp set. This allows for synchronous adjustment of the distance between clamp one 21 and clamp two 22 in each clamp assembly 2. In this embodiment, the driving component 8 can be a motor that directly drives the transmission gear, or a linear driving component 8 such as a lead screw 9 or an electric telescopic rod used to move clamp one 21 or clamp two 22. The mechanism having a transmission gear and a gear shaft 101 is also called a synchronous drive 10, with the transmission gear disposed inside the housing of the synchronous drive 10.

[0044] To further improve the transmission stability between guide drive shaft 4 and guide drive shaft 3 and clamp assembly 2, further, in combination with Figure 2 , Figure 3 and Figure 7 As shown, two guide drive shafts 4 and 3 are respectively provided. The transmission can be made more stable by using multiple guide drive shafts 4 and 3, and the following distribution structure is preferred for installation.

[0045] One distribution structure is as follows: the first guide shaft 4 and the second guide shaft 3 are arranged in a rectangular array, and the two first guide shafts 4 are located at opposite corners of the rectangular array; such a distribution structure can avoid the transmission jamming that would occur if the first guide shaft 4 and the second guide shaft 3 were arranged in the upper and lower rows respectively, thereby improving the stability of the transmission.

[0046] Another distribution structure is as follows: the first guide shaft 4 and the second guide shaft 3 are arranged in a linear array, with the two first guide shafts 4 in the middle and the two second guide shafts 3 at both ends, or the first guide shafts 4 and the second guide shafts 3 are arranged alternately in the linear array distribution direction. This distribution structure can also avoid transmission jamming that would occur if the first guide shaft 4 and the second guide shaft 3 were arranged in two separate rows, thus improving transmission stability.

[0047] In the specific implementation process, combined with Figures 7-9As shown, the first clamp 21 is provided with a lubricating bushing 210 for sliding engagement with the second guide drive shaft 3, and the second clamp 22 is provided with a lubricating bushing 210 for sliding engagement with the first guide drive shaft 4. The sliding bushings allow for smoother sliding between the first clamp 21 and the second guide drive shaft 3, and between the second clamp 22 and the first guide drive shaft 4, reducing frictional resistance during sliding.

[0048] Please refer to Figure 2 , Figure 8 and Figure 9 As shown in the embodiments of this application, both clamp 1 21 and clamp 22 include clamp arm 1 23 and clamp arm 24. Clamp arm 1 23 has a first sliding surface, and clamp arm 24 has a second sliding surface that abuts against the first sliding surface to slide along the clamping direction. A sliding limiting mechanism is provided between the first sliding surface and the second sliding surface to allow clamp arm 1 23 and clamp arm 24 to slide and open and close along the clamping direction.

[0049] Each clamp assembly 2, including clamp 1 21 and clamp 22, includes clamping arm 1 23 and clamping arm 24. Clamping arm 1 23 and clamping arm 24 employ a sliding clamping method, meaning that the clamping portion 26 on them can open and close for clamping through relative sliding, with the sliding direction parallel to the clamping direction. Clamping arm 1 23 is fitted with the second sliding surface of clamping arm 24 via a first sliding surface and is slidably connected by a sliding limiting mechanism, limiting its sliding stroke within a certain range. This enables effective opening and closing, and the fitted arrangement reduces the lateral volume or size, minimizing the space occupied on both sides, thus facilitating the installation of more clamp assemblies 2 laterally. A connecting portion 25 for connecting guide drive shaft 1 4 and guide drive shaft 2 is provided on the relatively fixed clamping arm 1 23 or clamping arm 24.

[0050] In a preferred embodiment of the sliding limit mechanism, combined with Figure 7 and Figure 8 As shown, the sliding limiting mechanism includes a support portion 28 and a limiting sliding hole 29. The support portion is disposed on one of the first sliding surface and the second sliding surface, and the limiting sliding hole 29 is disposed on the other of the first sliding surface and the second sliding surface. The limiting sliding hole 29 extends along a first direction parallel to the clamping direction, and the support portion 28 is slidably fitted within the limiting sliding hole 29.

[0051] In this embodiment, the support portion 28 is used to slide with the limiting sliding hole 29 so that the clamping arm 23 and the clamping arm 24 slide relative to each other in the first direction within the sliding range defined by the limiting sliding hole 29. The relative sliding causes the clamping arm 23 and the clamping arm 24 to perform a clamping action. Furthermore, the support portion 28 slides within the sliding limiting hole, which not only enables sliding but also provides mutual support for the clamping fixture 21 and the clamping fixture 22, making the sliding of the clamping assembly 2 structure more stable and reliable.

[0052] In order to achieve the reset of clamping arm 23 and clamping arm 24 after clamping, an elastic element is provided between clamping arm 23 and clamping arm 24. The direction of action of the elastic element is parallel to the clamping direction of the clamping part 26 so that one clamping part 26 can reset and switch between the closed position and the open position relative to the other clamping part 26.

[0053] Clamping arms 23 and 24 slide and clamp along the clamping direction. By setting an elastic element parallel to the clamping direction between them, the clamping arm can be reset by the elastic force of the elastic element after the clamping action, thereby avoiding the clamping drive mechanism from resetting the clamping arm and reducing the structural configuration. The elastic element is preferably a spring 27.

[0054] Specifically, both clamping arm 23 and clamping arm 24 are provided with clamping parts 26, and the clamping parts 26 are provided with anti-slip structures. The anti-slip structures enable the clamping parts 26 to have greater friction when clamping the packaging bag, making the clamping more reliable; the anti-slip structures can be a number of anti-slip protrusions or anti-slip teeth provided on the clamping surface of the clamping parts 26.

[0055] Preferably, the support portion 28 is a pulley or a slider, and the limiting slide hole 29 is a blind hole. The blind hole structure of the limiting slide hole 29 allows the side away from the support portion 28 to be a closed structure. The closed structure makes the downward sliding limiting mechanism invisible from the outside, achieving a hiding effect, and also preventing dust from accumulating in the limiting slide hole 29.

[0056] To further improve the stability of sliding and the supporting effect, multiple sets of limiting sliding holes 29 and support parts 28 are provided on the clamp along the first direction. These multiple sets of limiting sliding holes 29 and support parts 28 better ensure the stable sliding of clamping arm 1 23 and clamping arm 24.

[0057] Furthermore, the clamping drive assembly for clamp 1 21 and clamp 22 can be driven by a cam transmission structure (not shown in the figure). For example, the clamping drive assembly may include a drive shaft extending along the guide direction, cam members mounted on the drive shaft and corresponding to each clamp, and a drive motor that drives the drive shaft to rotate. The drive motor drives the drive shaft to rotate and drives the cam members on it to rotate. The cam members are located above the movable clamping arm 24 and press against the clamping arm 24, so that the clamping arm 24 can perform a relative clamping action relative to the clamping arm 1 23 to achieve clamping. Since the spring 27 is compressed during clamping, when the cam members continue to rotate and gradually release the pressing force, the spring 27 will drive the clamping arm 24 to return to its original position, thereby completing a clamping opening and closing action. The clamping drive assembly can also be a telescopic cylinder 6 connected to the movable clamping arm 1 23 or clamping arm 24 through a linkage rod 5 for linkage drive clamping.

[0058] In the specific implementation process, combined with Figure 1 As shown, it also includes a housing 1, which has an opening 11 for the ends of the clamping arms 23 and 24 of each clamping assembly 2 to extend out, having a clamping portion 26.

[0059] The above are merely preferred embodiments of this utility model. It should be noted that the above preferred embodiments should not be considered as limitations on this utility model, and the scope of protection of this utility model should be determined by the scope defined in the claims. For those skilled in the art, several improvements and modifications can be made without departing from the spirit and scope of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model.

Claims

1. A packaging bag clamping mechanism, characterized in that, include: Several sets of clamping assemblies (2) arranged side by side, the clamping assembly (2) including a pair of clamps one (21) and clamp two (22); Guide drive shaft 1 (4) and guide drive shaft 2 (3) are arranged extending along the arrangement direction of the clamp assembly (2). The clamp 1 (21) is connected to the guide drive shaft 1 (4) and slides with the guide drive shaft 2 (3). The clamp 2 (22) is connected to the guide drive shaft 2 (3) and slides with the guide drive shaft 1 (4). A drive mechanism is connected to at least one set of clamping assemblies (2) to movably adjust the distance between clamp one (21) and clamp two (22) of the set of clamping assemblies (2).

2. The packaging bag clamping mechanism as described in claim 1, characterized in that, The driving mechanism includes a lead screw (9), which is provided with a first threaded section (91) and a second threaded section (92). The threads of the first threaded section (91) and the second threaded section (92) are opposite. The first threaded section (91) is screwed into a clamp (21), and the second threaded section (92) is screwed into a clamp (22). Alternatively, the driving mechanism includes a scissor telescopic member (7) with a fixed central hinge point, and the two ends of the scissor telescopic member (7) are respectively connected to clamp one (21) and clamp two (22); Alternatively, the drive mechanism includes a transmission gear and a gear drive shaft (101), with two gear drive shafts (101) meshing symmetrically on both sides of the transmission gear, and the two gear drive shafts (101) are respectively connected to clamp one (21) and clamp two (22).

3. The packaging bag clamping mechanism as described in claim 1, characterized in that, Two guide drive shafts are provided for each of the first guide drive shaft (4) and the second guide drive shaft (3); The first guide shaft (4) and the second guide shaft (3) are arranged in a rectangular array, and the two first guide shafts (4) are located at opposite corners of the rectangular array. Alternatively, the first guide shaft (4) and the second guide shaft (3) are arranged in a linear array, with the two first guide shafts (4) in the middle and the two second guide shafts (3) at both ends, or the first guide shaft (4) and the second guide shaft (3) are arranged in an alternating pattern in the linear array distribution direction.

4. The packaging bag clamping mechanism as described in claim 1, characterized in that, The first clamp (21) is provided with a lubricating bushing (210) for sliding engagement with the second guide shaft (3), and the second clamp (22) is provided with a lubricating bushing (210) for sliding engagement with the first guide shaft (4).

5. The packaging bag clamping mechanism as described in claim 1, characterized in that, Both clamp one (21) and clamp two (22) include clamp arm one (23) and clamp arm two (24). Clamp arm one (23) has a first sliding surface, and clamp arm two (24) has a second sliding surface that abuts against the first sliding surface to slide along the clamping direction. A sliding limiting mechanism is provided between the first sliding surface and the second sliding surface to allow clamp arm one (23) and clamp arm two (24) to slide and open and close along the clamping direction.

6. The packaging bag clamping mechanism as described in claim 5, characterized in that, The sliding limiting mechanism includes a support part (28) and a limiting sliding hole (29). The support part (28) is disposed on one of the first sliding surface and the second sliding surface, and the limiting sliding hole (29) is disposed on the other of the first sliding surface and the second sliding surface. The limiting sliding hole (29) extends along a first direction parallel to the clamping direction, and the support part (28) is slidably fitted in the limiting sliding hole (29).

7. The packaging bag clamping mechanism as described in claim 5, characterized in that, Both the first clamping arm (23) and the second clamping arm (24) are provided with clamping parts (26), and the clamping parts (26) are provided with anti-slip structures.

8. A packaging bag clamping mechanism as described in claim 7, characterized in that, An elastic element is provided between the first clamping arm (23) and the second clamping arm (24). The direction of action of the elastic element is parallel to the clamping direction of the clamping part (26) so that one clamping part (26) is reset and switched between the closed position and the open position relative to the other clamping part (26).

9. A packaging bag clamping mechanism as described in claim 6, characterized in that, The support part (28) is a pulley or a slider, and the limiting sliding hole (29) is a blind hole.

10. A packaging bag clamping mechanism as described in claim 6, characterized in that, The limiting sliding hole (29) and the support part (28) are provided in multiple sets at intervals along the first direction on the fixture.

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