Bag opening mechanism and packaging machine

Abstract

The invention discloses a bag opening mechanism and a packaging machine, and relates to the technical field of packaging bag opening, the bag opening mechanism comprises a plurality of pairs of upper suction cups, a plurality of pairs of lower suction cups, vertical rods, a supporting table, a packaging bag and an actuator, and further comprises an involute assembly, and when the upper suction cups are driven to move back to back, the involute assembly rotates with the lower ends of the upper suction cups as the axis and then horizontally moves; the lower sucking disc is driven to horizontally move; the external atmosphere gradually flows into the packaging bag; the actuator drives the upper suction cup to move in the opposite direction or the back direction and drives the lower suction cup to move in the opposite direction or the back direction. The device has the beneficial effects that through the arrangement of the involute assembly, the lower end of the upper suction cup can be firstly driven to rotate with the axis as the axis and then horizontally move, and the upper end of the upper suction cup simulates the action of uncovering a packaging bag by hands; and then the lower suction cup is driven to horizontally move, so that external atmosphere gradually flows into the packaging bag, and the possibility that the suction cup falls off due to the fact that the side walls of the packaging bag are relatively attached is reduced.

Description

Technical Field

[0001] This invention relates to the field of packaging bag opening technology, and more specifically, to bag opening mechanisms and packaging machines. Background Technology

[0002] Most existing automated packaging bags are equipped with a bag opening mechanism. Some of these mechanisms have a pair of suction cups, while others have multiple pairs of suction cups. However, the movement paths of these suction cups are basically the same, moving back and forth on a fixed straight line or arc, as seen in the documents with application numbers CN202022137866.0 and CN202111004500.9. Because the effective adsorption range between the suction cup and the packaging bag is small, and the distance between the suction cup and the packaging bag exceeds 1 mm, it cannot provide effective suction. If the fixed linear movement method encounters a situation where the side wall of the packaging bag is tightly attached, it cannot effectively open the packaging bag, resulting in a very high bag drop rate, which affects the subsequent bagging process. Therefore, a bag opening mechanism that can imitate the action of a human hand to gradually peel off the packaging bag from top to bottom is designed. Summary of the Invention

[0003] To address the above deficiencies, this invention provides a bag-opening mechanism and a packaging machine, thereby solving the aforementioned problems.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: The bag opening mechanism and packaging machine includes upper and lower suction cups (each equipped with multiple pairs), a vertical rod, a support platform, packaging bags, and actuators. It also includes... When the involute assembly drives the upper and lower suction cups to move in opposite directions, it rotates first around the lower end of the upper suction cup as the axis, then moves horizontally; then it drives the lower suction cup to move horizontally, allowing outside air to gradually enter the packaging bag. When the lower suction cup and the upper suction cup move in opposite directions, the lower suction cup first contacts the packaging bag, then drives the upper suction cup to move horizontally, and finally drives the lower end of the upper suction cup to rotate around the axis. At this time, the upper suction cup is in a vertical state. The actuator drives the upper suction cup to move in the opposite direction or away from it, and drives the lower suction cup to move in the opposite direction or away from it.

[0005] Furthermore, the involute assembly includes a horizontal plate mounted on the upper end of the upright, a hinge assembly at one end of the horizontal plate, a vertical plate mounted on the hinge assembly, an upper suction cup mounted on the vertical plate, a first rod mounted on the end of the vertical plate away from the hinge assembly, and a second rod mounted on the end of the horizontal plate away from the hinge assembly. The outline enclosed by the horizontal plate, the vertical plate, the first rod, and the second rod forms a parallelogram and has parallelogram characteristics. An elastic component is installed between the vertical plate and the upright, which can cause the vertical plate to rotate around its lower end.

[0006] Furthermore, the elastic component is a compression spring, and the horizontal plate is located at the upper end of the first rod.

[0007] Furthermore, the elastic component is a tension spring. The horizontal plate is located at the lower end of the first rod, and an L-shaped extrusion rod is installed at the lower end of the vertical plate. The reaction force generated by the L-shaped extrusion rods approaching each other drives the upper suction cup to stick tightly to the packaging bag. At this time, the tension spring is in a stretched state.

[0008] Furthermore, the involute assembly also includes an outer tube installed on the lower side wall of the upright, a piston rod installed inside the outer tube, a lower suction cup installed on the piston rod, and a compression spring II installed between the piston rod and the inner wall of the outer tube. The compression spring II drives the lower suction cup to move in opposite directions, and the movement stroke of the lower suction cup is greater than that of the upper suction cup.

[0009] Furthermore, it includes a transmission assembly, which includes a sliding groove mounted on the upper surface of the support platform. The sliding groove is provided in pairs, and a sliding block is provided in the sliding groove. The upright is mounted on the sliding block, and the actuator is mounted on the support platform. The actuator is a rotary motor, and a connecting handle is installed between the rotary motor and the sliding block. The rotary motor reciprocates, driving the sliding block to move back and forth.

[0010] Furthermore, the hinge assembly includes hinge shafts on both sides of the horizontal plate, the hinge shafts passing through the vertical plate, nylon protrusions on both sides of the horizontal plate, and recesses on the vertical plate, into which the nylon protrusions are inserted.

[0011] Furthermore, the upright is divided into a left pole and a right pole. A solid pole is installed on the left pole, with a cylindrical groove at one end. The cylindrical groove is open at one end, and a shearing blade is located inside the open end of the cylindrical groove. A discharge hole is opened on the lower surface of the solid pole for material discharge. A venting rod is installed on the right pole. The venting rod is hollow, and a shearing blade is located outside one end of the venting rod. The shearing blade can pass through the shearing blade. The shearing blade and the shearing blade are interference-fitted. An exhaust hole is opened on the solid pole near the shearing blade and on the venting rod near the shearing blade. An exhaust hole is located at one end of the venting rod. Some air enters the packaging bag through the exhaust hole one, and some air enters the cylindrical groove through the exhaust hole two, which facilitates material discharge. The ventilation rod allows the packaging bag to be actively inflated, preventing it from being too tightly sealed due to atmospheric pressure, thus facilitating opening. Some air enters the cylindrical groove through the second vent hole, making material discharge easier.

[0012] Furthermore, the bag opening mechanism is installed at the working end of the packaging machine.

[0013] The beneficial effects of this invention are: by setting the involute component, the lower end of the upper suction cup can be driven to rotate around the axis first, and then move horizontally, with the upper end of the upper suction cup mimicking the action of a human hand opening a packaging bag; then the lower suction cup is driven to move horizontally, so that the outside air gradually flows into the packaging bag, reducing the possibility of the suction cup falling off due to the packaging bag being too close to the side wall. Attached Figure Description

[0014] Figure 1This is a schematic diagram of the bag opening mechanism and packaging machine described in this invention; Figure 2 This is a schematic diagram of Embodiment 1 of the involute component; Figure 3 This is a schematic diagram of Embodiment 2 of the involute component; Figure 4 This is a schematic diagram of the outer tube; Figure 5 This is a schematic diagram of exhaust port one; Figure 6 This is a top view of the hinge axis; Figure 7 This is a side view of the nylon protrusions; Figure 8 This is a schematic diagram of the state of Embodiment 1 of the involute component; Figure 9 This is a schematic diagram of the state of the involute component in embodiment two; In the diagram: 1. Upper suction cup; 2. Lower suction cup; 3. Vertical rod; 4. Support platform; 5. Packaging bag; 6. Actuator; 7. Involute assembly; 71. Horizontal plate; 72. Hinge assembly; 73. Vertical plate; 74. First rod; 75. Second rod; 76. Elastic component; 761. Compression spring one; 762. Tension spring; 763. L-shaped extrusion rod; 77. Outer tube; 78. Piston rod; 79. Compression spring two; 81. Slide groove; 82. Sliding block; 83. Connecting handle; 721. Hinge shaft; 722. Nylon protrusion; 723. Recess; 31. Left rod; 32. Right rod; 311. Solid rod; 312. Cylindrical groove; 313. Shearing blade one; 314. Discharge hole; 321. Vent rod; 322. Shearing blade two; 323. Exhaust hole one; 324. Exhaust hole two. Detailed Implementation

[0015] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0016] This application provides a bag-opening mechanism and a packaging machine; please refer to [reference needed]. Figures 1-9 It includes an upper suction cup 1 and a lower suction cup 2, each with multiple pairs, a vertical rod 3, a support platform 4, a packaging bag 5, and an actuator 6, and also includes... When the involute assembly 7 drives the upper suction cup 1 and the lower suction cup 2 to move in opposite directions, it first rotates around the lower end of the upper suction cup 1 as the axis, and then moves horizontally; then it drives the lower suction cup 2 to move horizontally; so that the outside air gradually flows into the packaging bag 5. When the lower suction cup 2 and the upper suction cup 1 move in opposite directions, the lower suction cup 2 first contacts the packaging bag 5, then drives the upper suction cup 1 to move horizontally, and finally drives the lower end of the upper suction cup 1 to rotate around the axis. At this time, the upper suction cup 1 is in a vertical state. Actuator 6 drives the upper suction cup 1 to move in opposite directions or away from each other, and drives the lower suction cup 2 to move in opposite directions or away from each other.

[0017] In practical applications, the packaging bag 5 is moved to the position of the upper suction cup 1 by an external clamping device. At this time, there is a gap between each pair of upper suction cups 1 and lower suction cups 2, and the initial state is as follows. Figure 8 and Figure 9 The actuator 6 can drive the upper suction cups 1 to move closer together, and at the same time drive the lower suction cups 2 to move closer together until the packaging bag 5 is clamped. Then, the actuator 6 is controlled to work in reverse, first driving the upper suction cups 1 to move away from each other. Through the setting of the involute component 7, the upper suction cups 1 can be controlled to rotate with its lower end as the axis. After rotating a certain angle, the upper suction cups 1 will then perform a translation operation, which can achieve the effect of gradually opening the opening of the packaging bag 5 by hand, making it easier for air to flow into the packaging bag 5. Then, because the lower suction cup 2 has a long elastic stroke, after the upper suction cup 1 has finished translating, the lower suction cup 1 will then translate again to achieve the purpose of fully unfolding the packaging bag 5; Finally, packaging bag 5 is removed using an external clamping device.

[0018] Reference Figure 1 , Figure 2 , Figure 3 , Figure 8 and Figure 9 The involute assembly 7 includes a horizontal plate 71 mounted on the upper end of the upright 3. A hinge assembly 72 is provided at one end of the horizontal plate 71. A vertical plate 73 is mounted on the hinge assembly 72. An upper suction cup 1 is mounted on the vertical plate 73. A first rod 74 is mounted on the end of the vertical plate 73 away from the hinge assembly 72. A second rod 75 is mounted on the end of the horizontal plate 71 away from the hinge assembly 72. The outline enclosed by the horizontal plate 71, the vertical plate 73, the first rod 74, and the second rod 75 forms a parallelogram and has parallelogram characteristics. An elastic member 76 is installed between the vertical plate 73 and the upright 3. The elastic member 76 can cause the vertical plate 73 to rotate around its lower end.

[0019] In practical applications, the initial state of the involute component 7 is as follows: Figure 8 or Figure 9 When the actuator 6 indirectly drives the upright 3 to move, the upright 3 drives the horizontal plate 71, the vertical plate 73, the first rod 74 and the second rod 75 to move synchronously. When the upper suction cup 1 and the lower suction cup 2 come into contact with the packaging bag 5, the upper suction cup 1 and the lower suction cup 2 overcome the elastic force of the elastic component 76 and gradually adhere to the packaging bag 5. The parallelogram set formed by the contour of the horizontal plate 71, the vertical plate 73, the first rod 74 and the second rod 75 allows the upper suction cup 1 and the lower suction cup 2 to stably hold the packaging bag 5.

[0020] Example 1 of the involute component 7, refer to Figure 1 , Figure 2 and Figure 8 The elastic component 76 is a compression spring 761, and the horizontal plate 71 is located at the upper end of the first rod 74.

[0021] In practical applications Figure 8 This is a schematic diagram of the initial state of Embodiment 1 of the involute assembly 7. At this time, the compression spring 761 is in a state of no force. During operation, the lower end of the upper suction cup 1 first contacts the packaging bag 5. As the upright rod 3 continues to move, the compression spring 761 is gradually compressed until it moves to the position of the packaging bag 5. Figure 2 In this state, the upper suction cup 1 clamps the packaging bag 5, and the two sides of the packaging bag 5 can be sucked open by the external vacuum pump equipment to achieve the effect of opening the bag.

[0022] Example 2 of the involute component 7, see below Figure 3 and Figure 9 The elastic component 76 is a tension spring 762. The horizontal plate 71 is located at the lower end of the first rod 74. An L-shaped extrusion rod 763 is installed at the lower end of the vertical plate 73. The reaction force generated by the L-shaped extrusion rods 763 approaching each other drives the upper suction cup 1 to stick to the packaging bag 5. At this time, the tension spring 762 is in a stretched state.

[0023] In practical applications Figure 9 This is a schematic diagram of the initial state of Embodiment 2 of the involute assembly 7. At this time, the tension spring 762 is in a state of no force. During operation, the lower end of the L-shaped extrusion rod 763 first contacts the packaging bag 5. As the upright rod 3 continues to move, the tension spring 762 is in a state of gradual stretching until it moves to the desired position. Figure 3 In this state, the upper suction cup 1 clamps the packaging bag 5, and the two sides of the packaging bag 5 can be sucked open by the external vacuum pump equipment to achieve the effect of opening the bag.

[0024] Reference Figure 1 and Figure 4 The involute assembly 7 also includes an outer tube 77 installed on the lower side wall of the upright 3. A piston rod 78 is installed inside the outer tube 77. The lower suction cup 2 is installed on the piston rod 78. A compression spring 2 79 is installed between the piston rod 78 and the inner wall of the outer tube 77. The compression spring 2 79 drives the lower suction cup 2 to move in opposite directions. The movement stroke of the lower suction cup 2 is greater than the movement stroke of the upper suction cup 1.

[0025] In practical applications, when the uprights 3 move away from each other, the movement of the lower suction cup 2 is later than the movement of the upper suction cup 1. Through the action of the compression spring 79, the piston rod 78 and the lower suction cup 2 can stick tightly to the packaging bag 5, and the piston rod 78 has a certain stroke.

[0026] Reference Figure 1 and Figure 4The system includes a transmission assembly 8, which includes a slide groove 81 mounted on the upper surface of the support platform 4. The slide groove 81 has a pair of slide blocks 82, and the vertical rod 3 is mounted on the slide block 82. The actuator 6 is mounted on the support platform 4. The actuator 6 is a rotary motor 61. A connecting handle 83 is installed between the rotary motor 61 and the slide block 82. The rotary motor 61 reciprocates, driving the slide block 82 to move reciprocally.

[0027] In practical applications, when the actuator 6 rotates, the sliding block 82 and the upright rod 3 move in opposite directions through the action of the connecting handle 83, controlling the actuator 6 to rotate forward and backward, and indirectly driving the upper suction cup 1 and the lower suction cup 2 to move back and forth.

[0028] Reference Figure 1 , Figure 2 , Figure 3 and Figure 4 The hinge assembly 72 includes hinge shafts 721 on both sides of the horizontal plate 71, the hinge shafts 721 pass through the vertical plate 73, the horizontal plate 71 has nylon protrusions 722 on both sides, and the vertical plate 73 has recesses 723, the nylon protrusions 722 are inserted into the recesses 723.

[0029] In practical applications, the recess 723 is set on the vertical plate 73, and the nylon protrusion 722 is set on the horizontal plate 71. By inserting the nylon protrusion 722 into the recess 723, when the angle between the horizontal plate 71 and the vertical plate 73 changes, the nylon protrusion 722 will be stuck in the recess 723 one by one, achieving a similar "vibration" effect, making the bag opening process easier.

[0030] Reference Figure 1 , Figure 4 and Figure 5 The upright 3 is divided into a left pole 31 and a right pole 32. A solid pole 311 is installed on the left pole 31. One end of the solid pole 311 has a cylindrical groove 312, which is open at one end. The inner side of the open end of the cylindrical groove 312 is a shearing blade 313. A discharge hole 314 is opened on the lower surface of the solid pole 311 for material discharge. A venting rod 321 is installed on the right pole 32. The venting rod 321 is hollow, and a second shearing blade 322 is located on the outer side of one end of the venting rod 321. 322 can pass through shear blade 313. Shear blade 313 and shear blade 322 are interference fit. There are exhaust holes 323 on the solid rod 311 near shear blade 313 and on the ventilation rod 321 near shear blade 322. One end of the ventilation rod 321 is exhaust hole 324. Some air enters the packaging bag 5 through exhaust hole 314 and some air enters the cylindrical groove 312 through exhaust hole 324, which facilitates material discharge.

[0031] In practical applications, this device is suitable for packaging bags 5 other than liquid packaging bags. Before opening the bag, shear blade 1 313 and shear blade 2 322 are brought close to each other until the bottom of the packaging bag 5 is opened. Then, outside air is introduced into the positions of exhaust port 1 323 and exhaust port 2 324 through the ventilation rod 321. Some air enters into the packaging bag 5 through exhaust port 1 314, so that the inside of the packaging bag 5 can be actively inflated, avoiding the packaging bag 5 being too tightly sealed due to atmospheric pressure, which facilitates the opening operation. Some air enters into the cylindrical groove 312 through exhaust port 2 324, which facilitates material discharge.

Claims

1. A bag-opening mechanism, comprising an upper suction cup (1) and a lower suction cup (2), each having multiple pairs, a vertical rod (3), a support platform (4), a packaging bag (5), and an actuator (6), characterized in that, It also includes, When the involute assembly (7) drives the upper suction cup (1) and the lower suction cup (2) to move in opposite directions, it first rotates around the lower end of the upper suction cup (1) as the axis, and then moves horizontally; then it drives the lower suction cup (2) to move horizontally; so that the outside air gradually flows into the packaging bag (5). When the lower suction cup (2) and the upper suction cup (1) move in opposite directions, the lower suction cup (2) first contacts the packaging bag (5), then drives the upper suction cup (1) to move horizontally, and finally drives the lower end of the upper suction cup (1) to rotate around the axis. At this time, the upper suction cup (1) is in a vertical state. The actuator (6) drives the upper suction cup (1) to move in the opposite direction or in the opposite direction, and drives the lower suction cup (2) to move in the opposite direction or in the opposite direction; The involute assembly (7) includes a horizontal plate (71) installed on the upper end of the upright (3). A hinge assembly (72) is provided at one end of the horizontal plate (71). A vertical plate (73) is installed on the hinge assembly (72). An upper suction cup (1) is installed on the vertical plate (73). A first rod (74) is installed on the end of the vertical plate (73) away from the hinge assembly (72). A second rod (75) is installed on the end of the horizontal plate (71) away from the hinge assembly (72). The outline enclosed by the horizontal plate (71), the vertical plate (73), the first rod (74), and the second rod (75) forms a parallelogram and has parallelogram characteristics. An elastic member (76) is installed between the vertical plate (73) and the upright (3). The elastic member (76) can cause the vertical plate (73) to rotate around its lower end.

2. The bag-opening mechanism according to claim 1, characterized in that, The elastic component (76) is a compression spring (761), and the horizontal plate (71) is located at the upper end of the first rod (74).

3. The bag-opening mechanism according to claim 1, characterized in that, The elastic component (76) is a tension spring (762). The horizontal plate (71) is located at the lower end of the first rod (74). An L-shaped extrusion rod (763) is installed at the lower end of the vertical plate (73). The reaction force generated by the L-shaped extrusion rods (763) approaching each other drives the upper suction cup (1) to stick to the packaging bag (5). At this time, the tension spring (762) is in a stretched state.

4. The bag-opening mechanism according to claim 2 or 3, characterized in that, The involute assembly (7) also includes an outer tube (77) installed on the lower side wall of the upright (3). A piston rod (78) is installed inside the outer tube (77). The lower suction cup (2) is installed on the piston rod (78). A compression spring (79) is installed between the piston rod (78) and the inner wall of the outer tube (77). The compression spring (79) drives the lower suction cup (2) to move in opposite directions. The movement stroke of the lower suction cup (2) is greater than that of the upper suction cup (1).

5. The bag-opening mechanism according to claim 4, characterized in that, The transmission assembly (8) includes a slide groove (81) mounted on the upper surface of the support platform (4). The slide groove (81) is provided in pairs, and a sliding block (82) is provided in the slide groove (81). The upright (3) is mounted on the sliding block (82). The actuator (6) is mounted on the support platform (4). The actuator (6) is a rotary motor (61). A connecting handle (83) is installed between the rotary motor (61) and the sliding block (82). The rotary motor (61) rotates back and forth, driving the sliding block (82) to move back and forth.

6. The bag-opening mechanism according to claim 5, characterized in that, The hinge assembly (72) includes hinge shafts (721) on both sides of the horizontal plate (71), the hinge shafts (721) pass through the vertical plate (73), the horizontal plate (71) has nylon protrusions (722) on both sides, and the vertical plate (73) has recesses (723) inserted into the recesses (723).

7. The bag-opening mechanism according to claim 6, characterized in that, The upright (3) is divided into a left pole (31) and a right pole (32). A solid pole (311) is installed on the left pole (31). One end of the solid pole (311) is provided with a cylindrical groove (312). One end of the cylindrical groove (312) is open. The inner side of the open end of the cylindrical groove (312) is a shearing blade (313). The lower surface of the solid pole (311) is provided with a discharge hole (314) for discharging material. A venting rod (321) is installed on the right pole (32). The venting rod (321) is hollow. The outer side of one end of the venting rod (321) is a shearing blade (322). The second (322) can pass through the first shearing blade (313). The first shearing blade (313) and the second shearing blade (322) are interference fit. The solid rod (311) near the first shearing blade (313) and the ventilation rod (321) near the second shearing blade (322) have an exhaust hole (323). One end of the ventilation rod (321) is an exhaust hole (324). Some air enters the packaging bag (5) through the first exhaust hole (314), and some air enters the cylindrical groove (312) through the second exhaust hole (324) to facilitate material discharge.

8. A packaging machine, comprising a bag-opening mechanism as described in any one of claims 1-7, characterized in that, The bag opening mechanism is installed at the working end of the packaging machine.

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