A bag holder for m-fold and gusset bags and a control method thereof

Abstract

The application relates to a bag clamping device, in particular to a bag clamping device for M-fold bags and one-letter bags and a control method thereof. Two lifting cylinders of the bag clamping device are arranged at two ends of a main frame along the length direction of the main frame, and the tail ends of the two lifting cylinders are respectively hinged to the upper ends of the main frame; a lifting frame is arranged on the lower side of the main frame and is sleeved outside two guard plate assemblies, and the two ends of the lifting frame along the length direction are respectively hinged to the output ends of the two lifting cylinders; two bag supporting assemblies each comprise a bag supporting driving unit and a bag supporting rod; the two bag supporting rods are respectively installed on the lifting frame through the bag supporting driving units; two M forming assemblies each comprise a forming driving unit and an M former; the two M formers are respectively installed on the lifting frame through the forming driving units; the M former is provided with a gap in the width direction of the main frame, and in the length direction projection of the main frame, the bag supporting rod is located in the gap. The bag clamping device can adapt to two types of bags through a single device, and the investment and maintenance cost of the device is reduced.

Description

Technical Field

[0001] This invention relates to a bag clamp and its control method, specifically to a bag clamp for M-fold bags and straight bags, and a control method for the bag clamp. Background Technology

[0002] In the field of material packaging, bag clamps are key equipment in automated production lines used to secure packaging bags and assist in bagging, bag opening, and unloading. In existing technologies, bag clamps are typically designed for a single bag type (such as a straight bag or an M-fold bag), leading to the following problems:

[0003] 1. Insufficient compatibility: Specialized equipment is required for different bag types, increasing production costs and space usage;

[0004] 2. Poor forming effect: When forming M-fold bags, wrinkles and irregular creases are prone to occur at the bag opening, affecting the sealing quality;

[0005] 3. Low operating efficiency: Switching bag types requires stopping the machine to adjust the structure, reducing production continuity.

[0006] Therefore, in order to solve the above problems, there is an urgent need for a bag clamp that is versatile, has high forming accuracy, and can quickly switch working modes. Summary of the Invention

[0007] The purpose of this invention is to solve the technical problems of insufficient compatibility, poor forming effect and low operating efficiency of existing bag clamps, and to provide a bag clamp for M-fold bags and straight bags and its control method.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0009] A bag clamp for M-fold bags and single-fold bags, characterized by:

[0010] It includes a main frame, two guard plate assemblies, two lifting cylinders, one lifting frame, two support bag assemblies, and two M-forming assemblies;

[0011] The main frame has a centrally located discharge port, and two guard plate assemblies are installed side by side on the main frame along the width direction, respectively located on both sides of the discharge port of the main frame.

[0012] Two lifting cylinders are respectively located at both ends of the main frame along its length, and their tail ends are respectively hinged to the upper end of the main frame.

[0013] The lifting frame is located on the lower side of the main frame and is sleeved on the outside of the two guard plate assemblies. The two ends of the lifting frame along its length are respectively hinged to the output ends of the two lifting cylinders.

[0014] Two bag-supporting assemblies are respectively set to correspond to two lifting cylinders. Each bag-supporting assembly includes a bag-supporting drive unit and a bag-supporting rod. The two bag-supporting rods are respectively installed on the lifting frame through the bag-supporting drive unit, and are used to move closer to or away from the guard plate assembly under the drive of the bag-supporting drive unit.

[0015] Two M-forming components are respectively set to correspond to two lifting cylinders. Each M-forming component includes a forming drive unit and an M-forming device. The two M-forming devices are respectively mounted on the lifting frame through the forming drive unit, and are used to move closer to or away from the guard plate component under the drive of the M-forming device.

[0016] The M-forming device has a gap in the width direction of the main frame. The bag support rod is located within this gap when projected onto the length direction of the main frame, and is used to pass through the bag support rod during the M-folding bag forming process.

[0017] Furthermore, the molding drive unit includes a molding cylinder and a multi-link molding assembly;

[0018] One end of the multi-link forming assembly is installed on the lifting frame near the guard plate assembly, and the other end is connected to the M forming device;

[0019] The tail end of the forming cylinder is hinged to the corresponding end of the lifting frame along its length, and the output end is hinged to the other end of the multi-link forming assembly.

[0020] Furthermore, the bag-supporting drive unit includes a bag-supporting cylinder and a multi-link bag-supporting assembly;

[0021] One end of the multi-link bag support assembly is installed on the lifting frame away from the guard plate assembly, and the other end is connected to the bag support rod;

[0022] The tail end of the bag-supporting cylinder is hinged to the lifting frame, and the output end is hinged to the other end of the multi-link bag-supporting assembly.

[0023] Furthermore, both the multi-link molding assembly and the multi-link bag support assembly are four-bar linkage mechanisms;

[0024] The multi-link forming assembly includes a forming main arm and a forming auxiliary arm, and the multi-link bag supporting assembly includes a bag supporting main arm and a bag supporting auxiliary arm;

[0025] One end of the forming main boom and the forming auxiliary boom are respectively hinged to the lifting frame, and the forming main boom is located on the side of the forming auxiliary boom closer to the guard plate assembly;

[0026] The other end of the main forming arm is hinged to the middle of the M forming device, the other end of the auxiliary forming arm is hinged to the tail end of the M forming device, and the output end of the forming cylinder is hinged to the main forming arm near the M forming device.

[0027] The front end of the M-forming device is the working end, and the gap is set at the front end of the M-forming device;

[0028] One end of the main arm and the auxiliary arm of the bag support are respectively hinged to the lifting frame, and the main arm of the bag support is located on the side of the auxiliary arm of the bag support away from the guard plate assembly;

[0029] The output end of the bag-supporting cylinder is hinged to the end shaft at the other end of the main bag-supporting arm via a cylinder head cap. The tail end of the bag-supporting rod is fixed to the other end of the main bag-supporting arm via a pressure plate and bolts, and is located at the center position in the width direction of the lifting frame. The other end of the auxiliary bag-supporting arm is hinged to the bag-supporting rod via an internal thread shaft. The front end of the bag-supporting rod is the working end.

[0030] Furthermore, the M-forming device includes two forming rods and two fixing rods;

[0031] The two forming rods are spaced apart along the width of the main frame. One of the fixed rods is connected to the tail ends of the two forming rods at both ends and is hinged to the other end of the forming auxiliary arm. The other fixed rod is connected to the bends of the two forming rods at both ends and is hinged to the other end of the forming main arm.

[0032] The gap is formed between the front ends of the two forming rods, through which the bag support rod passes during M forming.

[0033] Furthermore, the bag-supporting rod is an L-shaped rod. Both the bag-supporting cylinder and the forming cylinder are pneumatic cylinders or servo electric cylinders.

[0034] Meanwhile, the present invention also provides a control method for a bag clamp for M-fold bags and single-sided bags, which is characterized by including the following steps:

[0035] A. The target packaging bag is a single-sided bag.

[0036] A1. In the initial state, the bag support rod and M-former are located close to the protective plate assembly, and the lifting frame is at its highest position. When the material packaging is completed, the bag support rod is moved away from the protective plate assembly by the bag support cylinder to flatten the bag opening.

[0037] A2. Finally, the lifting cylinder simultaneously moves the lifting frame downward to complete one unloading operation.

[0038] B. The target packaging bag is an M-fold bag.

[0039] B1. In the initial state, the M-former is located close to the protective plate assembly, the bag support rod is located away from the protective plate assembly, and the lifting frame is at its highest position. When the material packaging is completed, the M-former is moved away from the protective plate assembly by the forming cylinder to expand the packaging bag to the set size.

[0040] B2. Then, the bag support rod is moved closer to the protective plate assembly by controlling the bag support cylinder. During the movement, the bag support rod passes through the gap of the M-former and folds the bag opening of the packaging bag into an M shape.

[0041] B3. Finally, the lifting cylinder drives the lifting frame to move down, completing one unloading operation.

[0042] The beneficial effects of this invention are:

[0043] 1. Improved versatility: A single device can be adapted to two types of bags, reducing equipment investment and maintenance costs.

[0044] 2. Optimized forming quality: The M forming device and the bag support rod work together to greatly improve the smoothness of the creases of the M fold bag.

[0045] 3. Improved efficiency: Switching between multiple bag types requires no manual intervention, thus improving production efficiency.

[0046] 4. Structural stability: Through multi-link and modular design, mechanical wear is reduced and structural stability is improved.

[0047] 5. The four-bar linkage enables the bag support rod and the M-forming device to move horizontally, thereby allowing the front end of the bag support rod and the vertical part of the forming rod of the M-forming device to fit into the packaging bag, achieving the desired effect. Attached Figure Description

[0048] Figure 1 This is a schematic diagram of the structure of a bag clamping device for M-fold bags and single-fold bags according to an embodiment of the present invention;

[0049] Figure 2 This is a front view of an embodiment of a bag clamp for M-fold bags and single-sided bags according to the present invention, the main frame of which is not shown in the figure;

[0050] Figure 3 This is a schematic diagram of the structure of the M-forming device in an embodiment of the clamping device for M-fold bags and single-line bags of the present invention;

[0051] Figure 4 This is a schematic diagram of the initial state of the bag support assembly and the M forming assembly when the target packaging bag is a single-line bag in a bag clamping device control method for M-fold bags and single-line bags according to the present invention.

[0052] Figure 5 This is a schematic diagram showing the state of the bag opening folded into an M-shape by the bag support assembly and the M-forming assembly when the target packaging bag is an M-fold bag, according to a bag clamping device control method for M-fold bags and straight bags of the present invention.

[0053] In the picture:

[0054] 1-Main frame, 2-Guard plate assembly, 3-Lifting cylinder, 4-Lifting frame, 5-Bag support assembly, 51-Bag support drive unit, 511-Bag support cylinder, 512-Bag support main arm, 513-Bag support auxiliary arm, 514-Pressure block, 52-Bag support rod, 6-M forming assembly, 61-Forming drive unit, 611-Forming cylinder, 612-Forming main arm, 613-Forming auxiliary arm, 62-M forming device, 621-Forming rod, 622-Fixing rod, 7-Discharge port. Detailed Implementation

[0055] To make the objectives, advantages, and features of the present invention clearer, the following detailed description, in conjunction with the accompanying drawings and specific embodiments, provides a bag clamp and its control method for M-fold bags and single-line bags. The advantages and features of the present invention will become clearer according to the following specific embodiments. It should be noted that the accompanying drawings are all in a very simplified form and use non-precise proportions, used only to facilitate and clarify the illustration of the embodiments of the present invention; furthermore, the structures shown in the drawings are often part of the actual structure.

[0056] See Figure 1 and Figure 2 This embodiment provides a bag clamp for M-fold bags and straight bags, which mainly includes a main frame 1, two guard plate assemblies 2, two lifting cylinders 3, a lifting frame 4, two bag support assemblies 5, and two M-forming assemblies 6.

[0057] The main frame 1, serving as the supporting structure, is constructed of welded rectangular steel, with the discharge port 7 centrally located. Two guard plate assemblies 2 are bolted to the discharge port 7 in the middle of the main frame 1, and are positioned on either side of the main frame 1 along its width. Mounting brackets are provided at both ends of the upper part of the main frame 1 along its length. These mounting brackets are specifically designed according to the length of the lifting cylinder 3 to provide an installation position for the lifting cylinder 3.

[0058] In this embodiment, the lifting cylinder 3 is a servo electric cylinder. In other embodiments of the present invention, a pneumatic cylinder may also be used. The two lifting cylinders 3 are respectively disposed at both ends of the main frame 1 along its length direction, and their tail ends are respectively hinged to the upper end of the mounting bracket of the main frame 1. The output direction of the lifting cylinder 3 is vertical, so as to realize the height adjustment of the lifting frame 4.

[0059] The main body of the lifting frame 4 is a rectangular U-shaped structure, located on the lower side of the main frame 1, and fitted onto two guard plate assemblies 2. A preset distance is set between its inner side and the guard plate assembly 2 to avoid interference. The two ends of the lifting frame 4 along its length are respectively hinged to the output ends of two lifting cylinders 3, thereby driving the lifting frame 4 to rise and fall through the lifting cylinders 3.

[0060] Two bag-supporting assemblies 5 are respectively set with two lifting cylinders 3. Each bag-supporting assembly 5 includes a bag-supporting drive unit 51 and an L-shaped bag-supporting rod 52; the horizontal end of the bag-supporting rod 52 is the tail end, and the vertical end is the front end, that is, the working end. During the operation, it always maintains a stable state so as to stably open the bag opening.

[0061] The bag-supporting drive unit 51 includes a bag-supporting cylinder 511 and a multi-link bag-supporting assembly. In this embodiment, the multi-link bag-supporting assembly is a four-bar linkage, including a main bag-supporting arm 512 and a secondary bag-supporting arm 513. One end of the main bag-supporting arm 512 and the secondary bag-supporting arm 513 are respectively hinged to the lifting frame 4 at a position away from the guard plate assembly 2, and the main bag-supporting arm 512 is located on the side of the secondary bag-supporting arm 513 away from the guard plate assembly 2. The output end of the bag-supporting cylinder 511 is hinged to the end shaft at the other end of the main bag-supporting arm 512 through a cylinder head cap. The tail end of the bag-supporting rod 52 is fixed to the other end of the main bag-supporting arm 512 through a pressure plate 514 and bolts, and is located at the center position in the width direction of the lifting frame 4. The other end of the secondary bag-supporting arm 513 is hinged to the bag-supporting rod 52 through an internal threaded shaft. The tail end of the bag-supporting cylinder 511 is hinged to the lifting frame 4.

[0062] Two M-forming components 6 are respectively arranged corresponding to two lifting cylinders 3. Each M-forming component 6 includes a forming drive unit 61 and an M-forming device 62. The forming drive unit 61 includes a forming cylinder 611 and a multi-link forming assembly. The forming cylinder 611 is a servo electric cylinder, and the multi-link forming assembly is a four-bar linkage mechanism, including a forming main arm 612 and a forming auxiliary arm 613. The M-forming device 62 includes two forming rods 621 and two fixing rods 622. A bend is provided between the tail end and the front end of the forming rod 621, so that a certain angle is formed between the tail end and the front end. The two forming rods 621 are spaced apart along the width direction of the main frame 1. The two ends of one fixing rod 622 are connected to the tail ends of the two forming rods 621 respectively, and are hinged to the other end of the forming auxiliary arm 613. The two ends of the other fixing rod 622 are connected to the bend of the two forming rods 621 respectively, and are hinged to the other end of the forming main arm 612. A gap is formed between the front ends of the two forming rods 621, through which the bag support rod 52 passes during M-forming. The gap is greater than 1.2 times the width dimension of the support rod 52 along the main frame 1 to avoid interference.

[0063] One end of the forming main arm 612 and the forming auxiliary arm 613 are respectively hinged to the lifting frame 4 near the guard plate assembly 2, and the forming main arm 612 is located on the side of the forming auxiliary arm 613 near the guard plate assembly 2; the other end of the forming main arm 612 is hinged to the middle of the M forming device 62, the other end of the forming auxiliary arm 613 is hinged to the tail end of the M forming device 62, the output end of the forming cylinder 611 is hinged to the forming main arm 612 near the M forming device 62, and the tail end is hinged to the corresponding end of the lifting frame 4 along its length direction.

[0064] It should be noted that the lengths of the aforementioned forming main arm 612 and forming auxiliary arm 613, as well as the bag-supporting main arm 512 and bag-supporting auxiliary arm 513, need to be reasonably set to meet the requirement that the bag-supporting rod 62 passes through the gap of the M forming device 62, so as to ensure that the creases of the M folded bag are flat.

[0065] The above-mentioned bag-supporting drive unit 51 and forming drive unit 61 are only a preferred embodiment of the present invention. In other embodiments of the present invention, those skilled in the art can also use other mechanical structures for reasonable replacement, as long as they can achieve stable translation of the M-forming device 62 and the bag-supporting rod 52.

[0066] The control method for the aforementioned bag clamp is as follows:

[0067] A. The target packaging bag is a single-sided bag.

[0068] A1, see also Figure 4 In the initial state, the bag support rod 52 and the M-former 62 are located close to the guard plate assembly 2, and the lifting frame 4 is at its highest position. When the material packaging is completed, the bag support rod 52 is moved away from the guard plate assembly 2 by the bag support cylinder 511 to flatten the bag opening.

[0069] A2. Finally, the lifting cylinder 3 drives the lifting frame 4 to move down, completing one unloading operation.

[0070] B. The target packaging bag is an M-fold bag.

[0071] B1. In the initial state, the M-forming device 62 is located close to the protective plate assembly 2, the bag support rod 52 is located away from the protective plate assembly 2, and the lifting frame 4 is at its highest position. When the material packaging is completed, the M-forming device 62 is moved away from the protective plate assembly 2 by the forming cylinder 611 to expand the packaging bag to the set size.

[0072] B2, see also Figure 5 Then, the bag support rod 52 is controlled by the bag support cylinder 511 to move closer to the guard plate assembly 2. During the movement, the bag support rod 52 passes through the gap of the M-forming device 62 and folds the bag opening of the packaging bag into an M shape.

[0073] B3. Finally, the lifting cylinder 3 drives the lifting frame 4 to move down, completing one unloading operation.

Claims

1. A bag clamp for M-fold bags and single-fold bags, characterized in that: It includes a main frame (1), two guard plate assemblies (2), two lifting cylinders (3), a lifting frame (4), two support bag assemblies (5), and two M-forming assemblies (6); The main frame (1) is provided with a discharge port (7) in the center. The two guard plate assemblies (2) are installed side by side on the main frame (1) along the width direction and are located on both sides of the discharge port (7) of the main frame (1). The two lifting cylinders (3) are respectively located at both ends of the main frame (1) along its length, and their tail ends are respectively hinged to the upper end of the main frame (1); The lifting frame (4) is located on the lower side of the main frame (1) and sleeved on the outside of the two guard plate assemblies (2). The two ends of the lifting frame (4) along its length direction are respectively hinged to the output ends of the two lifting cylinders (3). The two bag-supporting assemblies (5) are respectively arranged corresponding to the two lifting cylinders (3). Each of the two bag-supporting assemblies (5) includes a bag-supporting drive unit (51) and a bag-supporting rod (52). The two bag-supporting rods (52) are respectively installed on the lifting frame (4) through the bag-supporting drive unit (51) and are used to move closer to or away from the guard plate assembly (2) under the drive of the bag-supporting drive unit (51). The two M-forming components (6) are respectively arranged corresponding to the two lifting cylinders (3). Each of the two M-forming components (6) includes a forming drive unit (61) and an M-forming device (62). The two M-forming devices (62) are respectively installed on the lifting frame (4) through the forming drive unit (61) and are used to move closer to or away from the guard plate component (2) under the drive of the M-forming device (62). The M-forming device (62) has a gap in the width direction of the main frame (1), and the bag support rod (52) is located in the gap when projected in the length direction of the main frame (1). The gap is used for the bag support rod (52) to pass through during the M-fold bag forming.

2. A bag clamp for M-fold bags and single-line bags according to claim 1, characterized in that: The molding drive unit (61) includes a molding cylinder (611) and a multi-link molding assembly; One end of the multi-link forming assembly is installed on the lifting frame (4) near the guard plate assembly (2), and the other end is connected to the M forming device (62); The tail end of the forming cylinder (611) is hinged to the corresponding end of the lifting frame (4) along its length direction, and the output end is hinged to the other end of the multi-link forming assembly.

3. A bag clamp for M-fold bags and single-line bags according to claim 2, characterized in that: The bag-supporting drive unit (51) includes a bag-supporting cylinder (511) and a multi-link bag-supporting assembly; One end of the multi-link bag support assembly is installed on the lifting frame (4) away from the guard plate assembly (2), and the other end is connected to the bag support rod (52); The tail end of the bag-supporting cylinder (511) is hinged to the lifting frame (4), and the output end is hinged to the other end of the multi-link bag-supporting assembly.

4. A bag clamp for M-fold bags and single-line bags according to claim 3, characterized in that: Both the multi-link molding assembly and the multi-link bag support assembly are four-link mechanisms. The multi-link forming assembly includes a forming main arm (612) and a forming secondary arm (613), and the multi-link bag supporting assembly includes a bag supporting main arm (512) and a bag supporting secondary arm (513). One end of the forming main arm (612) and the forming auxiliary arm (613) are respectively hinged to the lifting frame (4), and the forming main arm (612) is located on the side of the forming auxiliary arm (613) close to the guard plate assembly (2); The other end of the forming main arm (612) is hinged to the middle of the M forming device (62), the other end of the forming auxiliary arm (613) is hinged to the tail end of the M forming device (62), and the output end of the forming cylinder (611) is hinged to the position of the forming main arm (612) near the M forming device (62). The front end of the M-forming device (62) is the working end, and the gap is set at the front end of the M-forming device (62); One end of the main arm (512) and the auxiliary arm (513) of the bag support are respectively hinged to the lifting frame (4), and the main arm (512) of the bag support is located on the side of the auxiliary arm (513) away from the guard plate assembly (2); The output end of the bag-supporting cylinder (511) is hinged to the end shaft at the other end of the main bag-supporting arm (512) via a cylinder head cap. The tail of the bag-supporting rod (52) is fixed to the other end of the main bag-supporting arm (512) via a pressure plate (514) and bolts, and is located at the center of the width direction of the lifting frame (4). The other end of the bag-supporting auxiliary arm (513) is hinged to the bag-supporting rod (52) via an inner thread shaft. The front end of the bag support rod (52) is the working end.

5. A bag clamp for M-fold bags and single-line bags according to claim 4, characterized in that: The M-forming device (62) includes two forming rods (621) and two fixing rods (622); The two forming rods (621) are spaced apart along the width of the main frame (1). One of the fixed rods (622) is connected at both ends to the tail ends of the two forming rods (621) and is hinged to the other end of the forming auxiliary arm (613). The other fixed rod (622) is connected at both ends to the bends of the two forming rods (621) and is hinged to the other end of the forming main arm (612). The gap is formed between the front ends of the two forming rods (621), through which the bag support rod (52) passes during M forming.

6. A bag clamp for M-fold bags and single-sided bags according to claim 5, characterized in that: The bag support rod (52) is an L-shaped rod.

7. A bag clamp for M-fold bags and single-sided bags according to claim 3, characterized in that: Both the bag-supporting cylinder (511) and the forming cylinder (611) are pneumatic cylinders or servo electric cylinders.

8. A control method for a bag clamp for M-fold bags and single-sided bags as described in any one of claims 1-7, characterized in that, Includes the following steps: A. The target packaging bag is a single-sided bag. A1. In the initial state, the bag support rod (52) and the M-former (62) are located close to the guard plate assembly (2), and the lifting frame (4) is at its highest position. When the material packaging is completed, the bag support rod (52) is controlled by the bag support cylinder (511) to move away from the guard plate assembly (2) to flatten the bag opening. A2. Finally, the lifting cylinder (3) drives the lifting frame (4) to move down, completing one unloading operation. B. The target packaging bag is an M-fold bag. B1. In the initial state, the M-forming device (62) is located close to the protective plate assembly (2), the bag support rod (52) is located away from the protective plate assembly (2), and the lifting frame (4) is at its highest position. When the material packaging is completed, the M-forming device (62) is controlled by the forming cylinder (611) to move away from the protective plate assembly (2) and expand the packaging bag to the set size. B2. Then, the bag support rod (52) is controlled by the bag support cylinder (511) to move towards the guard plate assembly (2). During the movement, the bag support rod (52) passes through the gap of the M-forming device (62) and folds the bag opening of the packaging bag into an M shape. B3. Finally, the lifting cylinder (3) drives the lifting frame (4) to move down to complete one unloading operation.

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