A multi-functional bag clamp device and a bag opening and closing method

Abstract

The application provides a multifunctional bag clamping device and a bag opening and closing method, which comprises a front bag clamping mechanism and a rear bag clamping mechanism, the front bag clamping mechanism comprises a front left bag clamping assembly and a front right bag clamping assembly, and the rear bag clamping mechanism comprises a rear left bag clamping assembly and a rear right bag clamping assembly; the M-shaped bag in the open or closed state can be switched and mechanically clamped as required, so that the M-shaped bag can be opened, filled and sealed by an automatic packaging machine, and the device can also be used for opening and clamping ordinary bags.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of packaging machinery, in particular to a bag clamping device and a mechanical automatic opening and closing method of a bag using a packaging machinery. BACKGROUND

[0002] The M-shaped bag includes a front bag wall and a rear bag wall, and has a foldable side bag wall and a bag bottom between the front and rear bag walls. For the M-shaped bag, it is not possible to simply clamp the two sides of the bag as with the conventional bag, and the clamping action of the bag clamping device needs to be adapted to the clamping action of the pre-opening clamping, post-opening clamping, filling and sealing stations. For the M-shaped bag, it is difficult to use the conventional bag clamping device to achieve a set of mechanisms to adapt to the clamping action of the pre-opening clamping, post-opening clamping, filling and sealing stations, unless a complex mechanism is used. SUMMARY

[0003] The first object of the present application is to provide a bag opening and closing method that can adapt to the M-shaped bag. To this end, the present application uses the following technical solutions:

[0004] (1) The M-shaped bag folded into a sheet shape is sent to the bag clamping device, and the bag clamping device is provided with a front bag clamping mechanism and a rear bag clamping mechanism, and one of the front bag clamping mechanism and the rear bag clamping mechanism of the bag clamping device clamps the two side edges of the M-shaped bag;

[0005] (2) The bag clamping device is connected to the front and rear of the opening assembly, which is movable, to transfer the M-shaped bag and receive the M-shaped bag after opening, and the front bag wall and the rear bag wall are pulled apart by the opening assembly to open the bag;

[0006] (3) After filling, the distance between the front bag clamping mechanism and the rear bag clamping mechanism is shortened to seal the bag.

[0007] Further, the opening of the bag is only to open the bag in the folded state, and the bag is opened to a suitable opening size for filling by the front and rear movements of the front bag clamping mechanism and the rear bag clamping mechanism under program control after opening to before filling.

[0008] Further, after the bag is transferred to the opening mechanism at the opening station, the bag clamping device is adjusted to the appropriate front and rear positions, and then the two side edges of the bag are clamped again.

[0009] To achieve the above object, the present application can also use the following technical solutions:

[0010] The bag opening and closing method is characterized in that for the M-shaped bag, it includes the following steps,

[0011] (1) The M-shaped bag with the front and rear side edges separated is sent to a bag clamping device, the bag clamping device is provided with a front bag clamping mechanism and a rear bag clamping mechanism, which are respectively used for clamping the front and rear side edges of the M-shaped bag, the front bag clamping mechanism and the rear bag clamping mechanism are adjusted to match the distance between the front and rear side edges of the M-shaped bag, and the front and rear side edges of the M-shaped bag are clamped by the front bag clamping mechanism and the rear bag clamping mechanism respectively.

[0012] (2) After filling, the distance between the front bag clamping mechanism and the rear bag clamping mechanism is shortened to seal the bag.

[0013] Further, the M-shaped bag with the front and rear side edges separated is only a bag opened in a folded state, and the bag is opened to an opening size suitable for filling by the front and rear movements of the front bag clamping mechanism and the rear bag clamping mechanism under program control after the front and rear side edges of the M-shaped bag are clamped by the front bag clamping mechanism and the rear bag clamping mechanism.

[0014] Further, when the front bag clamping mechanism and the rear bag clamping mechanism of the bag clamping device receive the M-shaped bag, the bag clamping device is adjusted to the appropriate front and rear positions by moving to the sides and adjusting the front and rear distances, and then the front and rear side edges of the bag are clamped by moving the front and rear side edges of the bag closer.

[0015] The second object of the present application is to provide a multifunctional bag clamping device which can clamp the opening and closing states of M-shaped bags and ordinary bags, so that the M-shaped bags can be opened, filled and sealed by an automatic packaging machine. To this end, the present application adopts the following technical solutions:

[0016] A multifunctional bag clamping device, characterized in that it comprises a front bag clamping mechanism and a rear bag clamping mechanism, the front bag clamping mechanism comprises a front left bag clamping assembly and a front right bag clamping assembly, and the rear bag clamping mechanism comprises a rear left bag clamping assembly and a rear right bag clamping assembly.

[0017] The multifunctional bag clamping device is provided with a left-right adjusting mechanism to adjust the distance between the left assembly comprising the front left bag clamping assembly and the rear left bag clamping assembly and the right assembly comprising the front right bag clamping assembly and the rear right bag clamping assembly; a left front and rear displacement driving mechanism is arranged in the left assembly to adjust the distance between the front left bag clamping assembly and the rear left bag clamping assembly, and a right front and rear displacement driving mechanism is arranged in the right assembly to adjust the distance between the front right bag clamping assembly and the rear right bag clamping assembly.

[0018] The front left bag clamping assembly and the front right bag clamping assembly, and the rear left bag clamping assembly and the rear right bag clamping assembly are respectively provided with independent opening and closing driving mechanisms, so that the front left bag clamping assembly, the front right bag clamping assembly, the rear left bag clamping assembly and the rear right bag clamping assembly can be opened and closed individually.

[0019] On the basis of the above technical scheme, the application can further adopt the following technical scheme, or use the further technical schemes in combination.

[0020] The bag clamping assemblies of the front bag clamping mechanism and the rear bag clamping mechanism are staggered up and down.

[0021] The position of the front bag clamping mechanism in the front-rear direction is fixed, and the rear left bag clamping assembly and the rear right bag clamping assembly are respectively connected to the left front-rear displacement driving mechanism and the right front-rear displacement driving mechanism, so that the distance between the front bag clamping mechanism and the rear bag clamping mechanism is adjusted through the movement of the rear left bag clamping assembly and the rear right bag clamping assembly.

[0022] The multifunctional bag clamping device is provided with a left mounting seat and a right mounting seat, and the left mounting seat and the right mounting seat are connected to the left-right adjusting mechanism to adjust the distance; the left front-rear displacement driving mechanism and the right front-rear displacement driving mechanism are respectively mounted on the left mounting seat and the right mounting seat.

[0023] The position of the front bag clamping mechanism in the front-rear direction is fixed, and the rear left bag clamping assembly and the rear right bag clamping assembly are respectively connected to the left front-rear displacement driving mechanism and the right front-rear displacement driving mechanism, so that the distance between the front bag clamping mechanism and the rear bag clamping mechanism is adjusted through the movement of the rear left bag clamping assembly and the rear right bag clamping assembly.

[0024] The front left bag clamping assembly and the front right bag clamping assembly respectively include a front fixed part and a movable bag clamping element, the front fixed part is connected to the left mounting seat or the right mounting seat through a connecting rod, and a front bag clamping driving element is mounted on the front fixed part; the rear left bag clamping assembly and the rear right bag clamping assembly respectively include a rear fixed part and a movable bag clamping element, the rear fixed part is connected to the front-rear displacement driving mechanism, and a rear bag clamping driving element is mounted on the rear fixed part.

[0025] The bag clamping assemblies of the front bag clamping mechanism and the rear bag clamping mechanism are staggered up and down, for example, in the height direction, the bag clamping assembly of the front bag clamping mechanism is below, and the bag clamping assembly of the rear bag clamping mechanism is above, or vice versa; in the front-rear direction, the front fixed part in the bag clamping assembly of the front bag clamping mechanism is at the front side, the movable bag clamping element therein is at the rear side, and the front driving element is at the front side of the front fixed part; in the front-rear direction, the rear fixed part in the bag clamping assembly of the rear bag clamping mechanism is at the rear side, the movable bag clamping element therein is at the front side, and the rear driving element is at the rear side of the rear fixed part.

[0026] Due to the technical scheme of the application, the M-shaped bag in the open or closed state can be switched and mechanically clamped as needed, so that the M-shaped bag can be opened, filled and sealed by an automatic packaging machine, and the device of the application can also be used for the opening, closing and clamping of ordinary bags. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 Schematic diagram of the multifunctional bag clamp device of the present application.

[0028] Figure 2 Schematic diagram of the multifunctional bag clamp device of the present application.

[0029] Figure 3 Partial exploded view of the multifunctional bag clamp device of the present application.

[0030] Figure 4 Front view of the multifunctional bag clamp device of the present application.

[0031] Figure 5 Plan view of the multifunctional bag clamp device of the present application in the state of opening the front and rear bag clamps.

[0032] Figure 6 Flowchart of one embodiment of the bag opening and closing process of the present application.

[0033] Figure 7 Flowchart of another embodiment of the bag opening and closing process of the present application. DETAILED DESCRIPTION

[0034] With reference to the accompanying drawings, the multifunctional bag clamp device provided by the present application comprises a front bag clamp mechanism 100 and a rear bag clamp mechanism 200, the front bag clamp mechanism 100 comprising a front left bag clamping assembly and a front right bag clamping assembly, and the rear bag clamp mechanism 200 comprising a rear left bag clamping assembly and a rear right bag clamping assembly.

[0035] The multifunctional bag clamp device is provided with left-right adjusting mechanisms to adjust the distance between the left assembly comprising the front left bag clamping assembly and the rear left bag clamping assembly and the right assembly comprising the front right bag clamping assembly and the rear right bag clamping assembly; the left assembly is provided with a left front-rear displacement driving mechanism to adjust the distance between the front left bag clamping assembly and the rear left bag clamping assembly, and the right assembly is provided with a right front-rear displacement driving mechanism to adjust the distance between the front right bag clamping assembly and the rear right bag clamping assembly; for M-shaped bags, the device can adapt to the shape change of the bag during the processes of bag connection, bag opening, filling and sealing. The front left bag clamping assembly and the front right bag clamping assembly, and the rear left bag clamping assembly and the rear right bag clamping assembly are respectively provided with independent opening and closing driving mechanisms, so that the front left bag clamping assembly, the front right bag clamping assembly, the rear left bag clamping assembly and the rear right bag clamping assembly can be opened and closed individually.

[0036] For the M-shaped bag 302 in the open bag state, the front bag clamping mechanism is used to clamp the front edge 311 of the M-shaped bag, and the rear bag clamping mechanism is used to clamp the rear edge 312 of the M-shaped bag. When the bag is fed, the M-shaped bag 301 in the folded state without being opened is received by one of the front bag clamping mechanism 100 and the rear bag clamping mechanism 200 moved by the moving mechanism. For ordinary bags, the front bag clamping mechanism 100 and the rear bag clamping mechanism 200 can become double-station bag clamping devices, while clamping two bags.

[0037] The bag clamping assembly of the front bag clamping mechanism and the bag clamping assembly of the rear bag clamping mechanism are staggered up and down. In this way, the sealing of the M-shaped bag is more convenient, and the structure for meeting this function is simplified. In the embodiment, in the height direction, the bag clamping assembly of the front bag clamping mechanism is below, and the bag clamping assembly of the rear bag clamping mechanism is above.

[0038] For the front-rear position adjustment relationship, a better implementation is that the position of the front bag clamping mechanism in the front-rear direction is fixed, and the rear bag clamping mechanism can be adjusted in the front-rear direction. In this way, not only the function for the M-shaped bag is ensured, but also when applied to ordinary bags, it is more convenient. Of course, the opposite relationship is also available, and the front bag clamping mechanism and the rear bag clamping mechanism can be adjusted in the front-rear direction.

[0039] In the embodiment, the rear left bag clamping assembly and the rear right bag clamping assembly are respectively connected to the left front-rear displacement driving mechanism and the right front-rear displacement driving mechanism, and the distance between the front bag clamping mechanism and the rear bag clamping mechanism is adjusted through the movement of the rear left bag clamping assembly and the rear right bag clamping assembly.

[0040] The multifunctional bag clamping device is provided with a left mounting seat 31 and a right mounting seat 32, which are connected to the left-right adjustment mechanism to adjust the distance; the left front-rear displacement driving mechanism and the right front-rear displacement driving mechanism are respectively mounted on the left mounting seat and the right mounting seat.

[0041] The left-right adjustment mechanism can adopt a transmission mechanism composed of a lead screw and a nut. The lead screw 33 is driven to rotate by the motor 30, and the nut 36 is connected to the left mounting seat 31 and the right mounting seat 32. The rotation directions of the left and right lead screws 33 are opposite, so that the left mounting seat 31 and the right mounting seat 32 can move synchronously and at the same speed in opposite directions. The left-right adjustment mechanism can also adopt other displacement adjustment structures. The multifunctional bag clamping device is provided with a mounting plate 34, and the mounting seat of the motor is mounted on the mounting plate 34. The mounting plate 34 can also be provided with a left-right displacement guide structure 35 of the left mounting seat 31 and the right mounting seat 32. Through the mounting plate 34, the bag clamping device can be mounted on a conveying device to be circularly conveyed or linearly reciprocally conveyed, and sequentially pass through various stations.

[0042] The left and right front and back displacement driving mechanisms can also adopt a connecting mechanism of a screw rod and a screw nut. The screw nut is installed in the left and right mounting seats 31 and 32, and the driving motors of the left and right front and back displacement driving mechanisms are installed in the left and right mounting seats 31 and 32, respectively. The left and right screw rods 4 are connected with the screw nuts installed in the left and right mounting seats 31 and 32, respectively. The motors in the left and right mounting seats 31 and 32 can be screw rod motors, which can drive the left and right screw nuts to rotate, so as to drive the left and right screw rods 4 to move forward and backward.

[0043] The bag clamping assembly will be further described in detail in combination with a preferred embodiment.

[0044] As described above, in the present embodiment, the position of the front bag clamping mechanism in the front and back direction is fixed. The front left and right bag clamping assemblies each include a front fixed part 11 and a movable bag clamping element 12. The front fixed parts 11 in the left and right assemblies are connected with the left and right mounting seats 31 and 32 through the left and right connecting rods 16, respectively. The front bag clamping driving element 14 and the guide rod 15 of the movable bag clamping element 12 are installed on the front fixed part 11. The movable bag clamping element 12 is sleeved on the guide rod 15 through a hole.

[0045] The left and right rear bag clamping assemblies each include a rear fixed part 21 and a movable bag clamping element 22. The rear fixed parts 21 (or the rear bag clamping driving elements 24 described below) in the left and right assemblies are connected with the left and right front and back displacement driving mechanisms (and the screw rods 4), respectively. The rear bag clamping driving element 24 is installed on the rear fixed part 21. The rear fixed part 21 and the movable bag clamping element 22 are sleeved on the connecting rod 16 through a hole, and the connecting rod 16 can be used as a guide rod.

[0046] The front and rear bag clamping driving elements 14 and 24 can be air cylinders, motors, electromagnets, etc.

[0047] The front fixed part 11 and the movable bag clamping element 12, the rear fixed part 21 and the movable bag clamping element 22 can form clamping functions respectively. Further, flexible bag clamping elements 13, 23 can be arranged on the front fixed part 11 and the rear fixed part 21 respectively, and the front left and right bag clamping elements 13, 23 and the movable bag clamping elements 12, 22 form front and rear bag clamping jaws respectively. As mentioned above, a preferred way is that the bag clamping assemblies of the front and rear bag clamping mechanisms are staggered in the vertical direction, i.e. the bag clamping assemblies of the front bag clamping mechanism are arranged below and the bag clamping assemblies of the rear bag clamping mechanism are arranged above, which can be combined with the following preferred way, so that the steps of the device are more compact and convenient for sealing.

[0048] In the front-rear direction, the front fixed part 11 of the bag clamping assembly of the front bag clamping mechanism is arranged at the front side, the movable bag clamping element 12 is arranged at the rear side, and the front driving element 14 is arranged at the front side of the front fixed part 11; in the front-rear direction, the rear fixed part 21 of the bag clamping assembly of the rear bag clamping mechanism is arranged at the rear side, the movable bag clamping element 22 is arranged at the front side, and the rear driving element 23 is arranged at the rear side of the rear fixed part 21.

[0049] The transmission mechanism of the above-mentioned screw rod and nut combination can also be replaced by a screw rod and nut combination.

[0050] Referring to Figure 6 , and combining Figures 1-5 , the opening and closing method of the M-shaped bag according to the present application is as follows, which can use the above-mentioned bag clamping device.

[0051] (1) The M-shaped bag folded into a sheet shape is sent to the bag clamping device, and the bag clamping device is provided with a front bag clamping mechanism and a rear bag clamping mechanism. The side edges of the M-shaped bag are clamped by the front bag clamping mechanism 100 of the bag clamping device; this step can be completed at the bag feeding station. The front bag clamping mechanism 100 adjusts the distance between the left and right assemblies by driving the left and right adjusting mechanisms to match the bag feeding action, and clamps the side edges of the M-shaped bag by the front left and right bag clamping assemblies through the driving of the front bag clamping driving element 14.

[0052] (2) When the M-shaped bag is conveyed to the bag opening station by the front bag clamping mechanism 100, it is received by the suction cup, and the front bag wall 313 and the rear bag wall 314 are respectively sucked by the front and rear suction cups 400 that can move forward and backward, and the front bag wall 313 and the rear bag wall 314 are pulled apart. The front bag clamping mechanism 100 and the rear bag clamping mechanism 200 adjust the distance between the left side assembly and the right side assembly through the driving of the left and right adjusting mechanisms to match the bag opening action, and through the driving of the front bag clamping driving element 14 and the rear bag clamping driving element 24, the M-shaped bag before opening is handed over to the suction cup 400 and the M-shaped bag after opening is re-received. In the process, the distance between the front left bag clamping assembly and the rear left bag clamping assembly, and the distance between the front right bag clamping assembly and the rear right bag clamping assembly are adjusted by the left and right front and rear displacement driving mechanisms.

[0053] (3) Before filling, the front bag clamping mechanism 100 and the rear bag clamping mechanism 200 can be further adjusted to increase the distance between them by the left and right front and rear displacement driving mechanisms, so that the mouth of the bag is fully opened. After filling, the distance between the front bag clamping mechanism and the rear bag clamping mechanism is shortened by the left and right front and rear displacement driving mechanisms to seal the bag, i.e. the state shown by reference numeral 303.

[0054] Referring to Figure 7 , and in combination with Figures 1-5 , another embodiment of the method for opening and closing the M-shaped bag is as follows, which can also use the bag clamping device described above.

[0055] (1) The M-shaped bag with the front and rear side edges separated is sent to the bag clamping device, and the front bag clamping mechanism 100 and the rear bag clamping mechanism 200 are simultaneously or in advance adjusted to match the distance between the front bag clamping mechanism 100 and the rear bag clamping mechanism 200 with the distance between the front and rear side edges that have been separated, and the front bag clamping mechanism and the rear bag clamping mechanism respectively clamp the front two side edges 311 and the rear two side edges 312 of the M-shaped bag;

[0056] (2) After filling, the distance between the front bag clamping mechanism 100 and the rear bag clamping mechanism 200 is shortened to seal the bag.

[0057] The M-shaped bag with the front and rear side edges separated is only a bag that is opened in a folded state (as shown in Figure 7 the left bag diagram, which is similar to Figure 6 the second bag from the left diagram), and after the front bag clamping mechanism and the rear bag clamping mechanism clamp the front and rear side edges of the M-shaped bag, the bag is opened to an opening size suitable for filling through the forward and backward movement of the front bag clamping mechanism and the rear bag clamping mechanism under program control (as shown in Figure 7 the middle bag diagram).

[0058] As in the foregoing embodiment, when the front bag clamping mechanism and the rear bag clamping mechanism of the bag clamping device receive the M-shaped bag, the bag clamping device is adjusted in the front-rear direction and the left-right direction, and when the front-rear position is appropriate, the bag clamping device is adjusted to the left-right direction to clamp the left and right edges of the bag.

[0059] The above merely describes the specific embodiments of the present application, but the structural features of the present application are not limited to the above. Any changes or modifications made by those skilled in the art within the scope of the present application are included in the protection scope of the present application.

[0060] It should be noted that the terms "comprise" and "have" and any variations thereof in the specification and claims of the present application and the above drawings are intended to cover non-exclusive inclusion. The terms "mount", "provide", "have", "connect", "connect", "connect", should be understood broadly. For example, it can be fixedly connected, detachably connected, or integrally configured; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication between two devices, elements or components. Those skilled in the art can understand the specific meaning of the above terms in the present application according to the specific circumstances.

[0061] In the description of the present application, it should be understood that the terms "one end", "the other end", "outer side", "inner side", "horizontal", "end", "length", "outer end", "left", "right" and the like indicate the orientation or positional relationship shown in the drawings, and are only used for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. The terms "first", "second" are only used for the convenience of description, and do not indicate or imply relative importance.

Claims

1. A method of opening and closing a bag, characterized by For the M-shaped bag, the following steps are included: (1) The folded sheet-shaped M-shaped bag is sent to a bag clamping device, which is provided with a front bag clamping mechanism and a rear bag clamping mechanism. One of the front bag clamping mechanism and the rear bag clamping mechanism of the bag clamping device clamps the folded side edges of the M-shaped bag. The bag clamping device includes a front bag clamping mechanism and a rear bag clamping mechanism. The front bag clamping mechanism includes a front left bag clamping assembly and a front right bag clamping assembly. The rear bag clamping mechanism includes a rear left bag clamping assembly and a rear right bag clamping assembly. The bag clamping device is provided with left-right adjusting mechanisms to adjust the distance between the left assembly including the front left bag clamping assembly and the rear left bag clamping assembly and the right assembly including the front right bag clamping assembly and the rear right bag clamping assembly. The left assembly is provided with a left front-rear displacement driving mechanism to adjust the distance between the front left bag clamping assembly and the rear left bag clamping assembly. The right assembly is provided with a right front-rear displacement driving mechanism to adjust the distance between the front right bag clamping assembly and the rear right bag clamping assembly. The front left bag clamping assembly and the front right bag clamping assembly, the rear left bag clamping assembly and the rear right bag clamping assembly are respectively provided with independent opening and closing driving mechanisms, so that the front left bag clamping assembly, the front right bag clamping assembly, the rear left bag clamping assembly and the rear right bag clamping assembly can be opened and closed individually. (2) The bag clamping device is provided with a left mounting seat and a right mounting seat. The front left bag clamping assembly and the front right bag clamping assembly each include a front fixed component and a movable bag clamping element. The front bag clamping driving element is mounted on the front fixed component. The rear left bag clamping assembly and the rear right bag clamping assembly each include a rear fixed component and a movable bag clamping element. The rear bag clamping driving element is mounted on the rear fixed component. Before and after opening the bag, the M-shaped bag before opening the bag is handed over to the suction cup through the driving of the front bag clamping driving element and the rear bag clamping driving element, and is re-received after opening the bag. During opening, the opening assembly that can move forward and backward is used to pull apart the front bag wall and the rear bag wall respectively, so that the bag is opened. (3) After filling, the distance between the front bag clamping mechanism and the rear bag clamping mechanism is shortened to seal the bag. The opening of the bag is only to open the bag in the folded state. After opening, the bag is opened to the appropriate opening size for filling through the forward and backward movement of the front bag clamping mechanism and the rear bag clamping mechanism under the program control.

2. The opening and closing method of a bag according to claim 1, characterized in that After the bag is handed over to the opening mechanism at the opening station, the bag clamping device moves to the sides and adjusts the front and rear distance. When the front and rear positions are adjusted to the appropriate positions, the bag clamping device moves to the two side edges of the bag again to clamp the opened M-shaped bag.

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