An opening mechanism for a packaging bag and a packaging machine

Abstract

The present invention provides a bag opening mechanism for a packaging bag and a packaging machine, relating to the technology of opening a packaging bag. Specifically disclosed are a machine shell, two mounting frames are installed inside the machine shell, and first clamping mechanisms for fixing the packaging bag are installed at the bottoms of the mounting frames; two positioning frames are arranged in pairs inside the machine shell, limiting grooves are formed on the opposite side walls of the two positioning frames, and second clamping mechanisms for clamping the side walls of the packaging bag are arranged in the limiting grooves; limiting mechanisms for restricting the movement of the packaging bag are arranged on the opposite side walls of the two positioning frames, and drive mechanisms for driving the first clamping mechanisms and the positioning frames on the same side to move synchronously are arranged inside the mounting frames; it is avoided that the middle part of the packaging bag is distorted, skewed or deflected to the same side without support, resulting in the situation that the packaging bag cannot be opened normally; the device prevents materials from accumulating at the inlet and outlet of the packaging bag, and prevents the materials from adhering to the sealing part of the packaging bag during the later packaging process.

Description

Technical Field

[0001] The present invention relates to the technical field of packaging bag opening, and in particular to a packaging bag opening mechanism and a packaging machine. Background Art

[0002] At present, in the production and manufacturing of food, chemical and other industries, it is generally necessary to pack raw materials, products, etc. in packaging bags to meet the requirements of storage and transportation of raw materials and products.

[0003] With the continuous development of production technology, the packaging of raw materials, products, etc. has been gradually replaced by traditional manual packaging by machines, thereby improving the efficiency of packaging raw materials, products, etc. At the same time, when packaging raw materials, products, etc. by machines, it can also save manpower, ultimately achieving an effect of reducing costs and increasing efficiency.

[0004] When the existing packaging machine opens the packaging bag, the clamping assembly arranged on the frame first clamps the two sides of the top of the packaging bag, and then the clamping assembly drives the bag body of the packaging bag to run together, and then goes through the processes of loading, opening, material placement, sealing and unloading of the packaging bag in sequence. When the packaging bag runs to the opening station, the suction cups arranged on both sides of the packaging bag press against each other, thereby generating suction on both sides of the packaging bag, and then the suction cups arranged on both sides of the packaging bag move away from each other, thereby opening the notch arranged above the packaging bag, wherein when the suction cups arranged on the packaging bag adsorb both sides of the packaging bag, the clamping assembly moves synchronously in the direction of approaching each other, thereby providing a movable margin for the opening of the packaging bag. After the packaging bag is opened, the support clamp arranged above the packaging bag finally falls into the opening to open the top opening of the packaging bag. With respect to the above-mentioned related technologies, the inventors found that when the existing suction cups adsorb the two sides of the packaging bag, if the bag is not in a flat state, it will affect the adsorption effect of the suction cups on the bag on the bag; and when the bag is opened, due to the flexible state of the bag, the opening and closing angle of the bag is not controlled, and the opening and closing size is small, which can easily affect the opening state of the top opening of the bag, and cause the outer wall of the pipe for conveying materials to contact the inner wall of the bag, causing different degrees of contamination to the bag, affecting the safety and hygiene of the food. Summary of the invention

[0005] The object of the present invention is to provide a bag opening mechanism and a packaging machine for packaging bags, which can solve the problems raised by the above-mentioned background technology in view of the deficiencies of the prior art.

[0006] The technical solution of the present invention is achieved in this way:

[0007] The invention provides a bag opening mechanism for packaging bags, comprising a casing, two mounting frames installed in the casing, and a first clamping mechanism for fixing the packaging bag installed at the bottom of each mounting frame; two adjusting frames are arranged in pairs in the casing, and limiting grooves are arranged on the opposite side walls of the two adjusting frames, and a second clamping mechanism for clamping the side wall of the packaging bag is arranged in the limiting groove; limiting mechanisms for limiting the movement of the packaging bag are arranged on the side walls of the two adjusting frames that are away from each other, and a driving mechanism for driving the first clamping mechanism located on the same side and the positioning frame to move synchronously is arranged in the mounting frame.

[0008] In some technical schemes of the present invention, the first clamping mechanism includes a fixed seat installed in the mounting frame, a clamping seat is installed on the side wall of the fixed seat, a clamping plate is slidably provided on the side wall of the fixed seat, and the clamping plate is transmission-connected to the driving mechanism; a third mounting rod is installed on the side wall opposite to the clamping plate, a third guide wheel is rotatably provided on the third mounting rod, a second mounting rod is installed on the side wall opposite to the clamping seat, and a second guide wheel is rotatably provided on the second mounting rod; an installation groove is opened in the fixed seat, and a reset spring connected to the clamping plate is installed in the installation groove.

[0009] In some technical schemes of the present invention, the second clamping mechanism includes a plurality of first mounting rods respectively installed on two opposite side walls of the limiting groove, and the first mounting rods are rotatably provided with a first guide wheel, and the circle where the first guide wheel is located is tangent to the packaging bag; the outer side walls of the first mounting rods are sleeved with a second spring connected to the positioning frame.

[0010] In some technical solutions of the present invention, the driving mechanism includes a mounting seat slidably arranged on the mounting frame in a horizontal direction, and a displacement seat abutting against the position adjustment frame is installed on the mounting seat;

[0011] A first inclined surface is provided on the side wall of the displacement seat opposite to the clamping plate, and a reverse extension line of the first inclined surface intersects with a reverse extension line of the clamping plate to form an acute angle;

[0012] A second rod body that abuts against the first inclined surface is disposed through the bottom of the mounting frame, and a third spring connected to the mounting frame is sleeved on the side wall of the second rod body;

[0013] A second push block is installed on the side wall of the second rod body, and a third inclined surface is provided on the side wall of the second push block opposite to the clamping plate; the reverse extension line of the third inclined surface intersects with the reverse extension line of the clamping plate to form an acute angle; and a first push rod connected to the mounting seat is installed on the mounting frame.

[0014] In some technical solutions of the present invention, the limiting mechanism includes a transmission wheel, an installation chamber is opened on the side wall of the positioning frame, a through groove connected to the installation chamber is opened on the side wall of the positioning frame away from the installation frame, the transmission wheel is rotatably arranged in the installation chamber, a limiting structure is installed on the transmission wheel, and a driving member for driving the transmission wheel to rotate is provided in the installation chamber.

[0015] In some technical solutions of the present invention, a second inclined surface is provided on the side wall of the displacement seat facing away from the clamping plate; a first rod body passes through the top of the mounting frame, and the first rod body abuts against the second inclined surface. The reverse extension line of the first inclined surface intersects with the reverse extension line of the second inclined surface to form an acute angle and faces the adjustment frame;

[0016] A first spring connected to the mounting frame is sleeved on the side wall of the first rod body. A limiting plate is installed at the free end of the first rod body. A sliding groove is provided on the side wall of the adjustment frame facing the limiting plate, and the end of the limiting plate is slidably arranged in the sliding groove.

[0017] In some technical solutions of the present invention, the limiting structure includes a plurality of rod sections spliced in sequence, and hinges are installed between any two adjacent rod sections.

[0018] Suction cups are installed on the rod sections, bellows communicating with the suction cups are passed through the rod sections, and any two adjacent bellows are communicated with each other.

[0019] In some technical solutions of the present invention, two limiting rods are installed on the fixed seat. The limiting rods are both slidably arranged in the mounting frame. Fourth springs abutting against the mounting frame are sleeved on the outer side walls of the limiting rods. A first push block is installed between the clamping plate and the second push block. The first push block is slidably arranged in the mounting frame. A fourth inclined surface parallel to the third inclined surface is provided on the first push block. A fifth inclined surface abutting against the clamping plate is provided on the side wall of the first push block. A sixth inclined surface parallel to the fifth inclined surface is provided on the side wall of the fixed seat.

[0020] Compared with the prior art, the present invention has at least the following advantages or beneficial effects: The first clamping mechanism is used to fix the bottom of the packaging bag, prevent the bottom of the packaging bag from deflecting, and improve the overall stability of the packaging bag during the process of filling materials; Two adjustment frames are provided in pairs in the machine shell. Limiting grooves with rectangular cross-sections are provided on the side walls of the two adjustment frames facing each other, and second clamping mechanisms for clamping the side walls of the packaging bag are provided in the limiting grooves; Keep the two sides of the packaging bag in a relatively fixed state and ensure that the two sides of the packaging bag maintain a relatively vertical state; Avoid the situation that when the two sides of the packaging bag approach each other under the control of the above structure, they are distorted and skewed, affecting the bag opening effect of the opening end of the packaging bag; Limiting mechanisms for restricting the movement of the packaging bag are provided on the side walls of the two adjustment frames facing away from each other; The limiting mechanism can provide a supporting force for the packaging bag that is not in the bag opening state, and avoid the situation that the middle part of the packaging bag is distorted, skewed or deflected to the same side without support, resulting in the situation that the packaging bag cannot be normally opened; Through the above structure, there will also be no problem of material accumulation at the inlet and outlet of the packaging bag, resulting in the situation that the material adheres to the packaging seal of the packaging bag during the later packaging process, affecting the packaging effect of the packaging bag. Description of the Drawings

[0021] Figure 1 This is a schematic installation structure diagram of the bag-opening mechanism in the present invention.

[0022] Figure 2 This is a three-dimensional structure diagram of the bag-opening mechanism in the present invention.

[0023] Figure 3 This is a schematic internal structure diagram of the bag-opening mechanism in the present invention.

[0024] Figure 4 This is a schematic rear view structure diagram of the first clamping mechanism in the present invention.

[0025] Figure 5 This is a schematic top view structure diagram of the bag-opening mechanism in the present invention.

[0026] Figure 6 This is a schematic top view structure diagram of the position adjustment frame in the present invention.

[0027] Figure 7 This is a schematic partial cross-sectional structure diagram of the first clamping mechanism in the present invention.

[0028] Figure 8 This is a schematic partial cross-sectional structure diagram of the limit structure in the present invention.

[0029] Reference numerals: 1, transmission mechanism; 2, machine housing; 3, packaging bag; 4, position adjustment frame; 5, limit mechanism; 501, transmission wheel; 503, rod joint; 504, suction cup; 505, hinge; 506, bellows; 6, mounting bracket; 601, mounting seat; 602, first push rod; 603, first rod body; 604, first spring; 605, limit plate; 7, clamping plate; 701, third spring; 702, second rod body; 703, first push block; 704, second push block; 705, fixed seat; 706, card seat; 707, fourth spring; 708, limit rod; 8, displacement seat; 9, first mounting rod; 10, second spring; 11, first guide wheel; 12, second mounting rod; 13, second guide wheel; 14, third mounting rod; 15, third guide wheel; 16, return spring. Detailed implementation manners

[0030] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated herein can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Specific implementation of the accompanying drawings Specific implementation of the accompanying drawings.

[0032] Example

[0033] The present invention provides a bag opening mechanism for a packaging bag, such as Figure 1 , Figure 2 As shown, it includes a casing 2, which is a special-shaped frame structure, which is bent into shape by a bending device, and the casing 2 has an installation chamber; two mounting frames 6 are installed in the casing 2, and the two mounting frames 6 are respectively fixedly installed on both sides of the casing 2 by bolts, and the mounting frames 6 are in a "匚"-shaped structure as a whole; the bottom of the mounting frames 6 is installed with a first clamping mechanism, which is used to fix the bottom of the packaging bag 3 to prevent the bottom of the packaging bag 3 from deflecting and improve the overall stability of the packaging bag 3 during the material filling process; two adjusting frames 4 are arranged in pairs in the casing 2, and the two adjusting frames 4 are provided with limiting grooves with rectangular cross-sections on the opposite side walls, and the limiting grooves are provided with second clamping mechanisms for clamping the side walls of the packaging bag 3; the two sides of the packaging bag 3 are in a relatively fixed state, and it is ensured that the two sides of the packaging bag 3 maintain a relatively vertical state; it is prevented that the two sides of the packaging bag 3 are twisted and skewed when they approach the middle under the control of the above-mentioned structure, thereby affecting the bag opening effect of the open end of the packaging bag 3.

[0034] The side walls of the two adjusting frames 4 that are away from each other are each provided with a limiting mechanism 5 for limiting the movement of the packaging bag 3; the limiting mechanism 5 can provide support for the packaging bag 3 that is not in the bag-opening state, thereby preventing the middle part of the packaging bag 3 from being twisted or deflected to the same side when not supported, causing the packaging bag 3 to be unable to be opened normally.

[0035] The mounting frame 6 is provided with a driving mechanism for driving the first clamping mechanism and the positioning frame 4 on the same side to move synchronously. The driving mechanism can drive the clamping end of the first clamping mechanism to extend out of the body of the first clamping mechanism to fix the bottom of the packaging bag 3; and the driving mechanism can also push the positioning frame 4 to move the side of the packaging bag 3 placed in the limiting groove toward the middle of the packaging bag 3.

[0036] Preferably, the length of the positioning frame 4 is approximately one third of the length of the packaging bag 3 .

[0037] In some technical solutions of the present invention, the first clamping mechanism includes a fixed seat 705 installed in the mounting frame 6. A clamping seat 706 is fixedly installed on the side wall of the fixed seat 705 through bolts. An installation opening adapted to the clamping plate 7 is formed on the side wall of the fixed seat 705. The clamping plate 7 is inserted into the installation opening. The installation opening is rectangular. The clamping plate 7 is in transmission connection with the driving mechanism; through holes are formed on the side wall of the clamping plate 7 opposite to the clamping seat 706. A third mounting rod 14 is installed in the through holes. The third mounting rod 14 is threadedly connected to the through holes; a third guide wheel 15 is rotatably provided on the third mounting rod 14 through a shaft rod. A second mounting rod 12 is fixedly installed on the side wall of the clamping seat 706 opposite to the clamping plate 7 by welding. A second guide wheel 13 is rotatably provided on the second mounting rod 12 through a shaft rod; an installation groove is formed in the fixed seat 705. A return spring 16 connected to the clamping plate 7 is installed in the installation groove. A retaining piece connected to the return spring 16 is provided on the clamping plate 7. The retaining piece is perpendicular to the clamping plate 7; through the above structure, the clamping plate 7 can return to the initial position after not receiving the thrust applied by the driving mechanism, and the clamping of the bottom of the packaging bag 3 is released.

[0038] Preferably, the provided installation opening can be obliquely arranged on the side wall of the fixed seat 705. After the above operation, the clamping plate 7 can move obliquely on the fixed seat 705, so as to fix the lower part of the packaging bag 3 more firmly.

[0039] In some technical solutions of the present invention, the second clamping mechanism includes a plurality of first mounting rods 9 respectively installed on two opposite side walls of the limiting groove. The first mounting rods 9 penetrate through the side walls of the limiting groove. First guide wheels 11 are rotatably provided on the first mounting rods 9 through shaft rods. The circles where the first guide wheels 11 are located are tangent to the horizontal plane of the packaging bag 3; second springs 10 connected to the position adjusting frame 4 are sleeved on the outer side walls of the first mounting rods 9. And there is a gap for accommodating the outer edge of the packaging bag 3 between two opposite first guide wheels 11 placed in the limiting groove under the action of the second springs 10, which is convenient for the outer edge of the packaging bag 3 to enter between the two first guide wheels 11, and is conducive to applying a clamping force to the outer edge of the packaging bag 3 by the above structure. When the driving mechanism can also push the position adjusting frame 4 to move the side edges of the packaging bag 3 placed in the limiting groove towards the middle of the packaging bag 3, it plays a certain limiting role on the side walls of the packaging bag 3, and ensures that the two sides of the packaging bag 3 move along a predetermined direction when moving towards the middle, improving the stability when the above structure expands the two sides of the packaging bag 3 in opposite directions to form an opening with an enlarged diameter.

[0040] In some technical schemes of the present invention, the driving mechanism includes a mounting seat 601 that is slidably arranged on the mounting frame 6 in a horizontal direction, a guide rail is arranged on the side wall of the mounting frame 6 in a horizontal direction, and a sliding member adapted to the guide rail is installed on the mounting seat 601 by bolts to ensure smooth movement of the mounting seat 601 on the mounting frame 6, avoiding problems such as jamming after long-term operation, which is not conducive to the occurrence of problems in later maintenance, and a displacement seat 8 is installed on the mounting seat 601, which is abutted against the adjustment frame 4.

[0041] A first inclined surface is provided on the side wall of the displacement seat 8 opposite to the clamping plate 7 . The first inclined surface is located on the lower end surface of the displacement seat 8 . The reverse extension line of the first inclined surface intersects with the reverse extension line of the clamping plate 7 to form an acute angle.

[0042] A second rod 702 abutting against the first inclined surface is penetrated through the bottom of the mounting frame 6, and a third spring 701 connected to the mounting frame 6 is sleeved on the side wall of the second rod 702; in the initial state, the upper end of the second rod 702 abuts against the first inclined surface and abuts against one end close to the positioning frame 4; at this time, the displacement seat 8 does not apply a thrust to the second rod 702.

[0043] A second push block 704 is installed on the side wall of the second rod body 702 by welding, and a third inclined surface is provided on the side wall of the second push block 704 opposite to the clamping plate 7; the third inclined surface is provided on the side of the second push block 704 away from the second rod body 702; the reverse extension line of the third inclined surface intersects with the reverse extension line of the clamping plate 7 at an acute angle; the first push rod 602 connected to the mounting seat 601 is installed on the mounting frame 6.

[0044] The working principle of the driving mechanism is as follows: the displacement seat 8 has a certain distance from the adjustment frame 4 in the initial state. When the telescopic end of the first push rod 602 gradually pushes the displacement seat 8 to approach the adjustment frame 4, the second rod body 702 gradually moves downward in the vertical direction under the action of the first inclined surface on the displacement seat 8, and the third spring 701 is compressed at this time; the second push block 704 moves downward in the vertical direction with the second rod body 702, and applies a thrust in the horizontal direction to the clamping plate 7 through the third inclined surface, and the clamping plate 7 is pushed out of the fixing seat 705, and then clamps and fixes the bottom of the packaging bag 3 in the clamping seat 706; at the same time, the distance between the displacement seat 8 and the adjustment frame 4 disappears, the displacement seat 8 will push the adjustment frame 4 to make the two sides of the packaging bag 3 close to the middle, so that the two sides of the packaging bag 3 move in opposite directions, and the packaging bag 3 expands to form an opening with a larger diameter, which is convenient for materials to enter the packaging bag 3; and avoids the outer wall of the filling tube from contacting the inner wall of the packaging bag 3, so as to avoid dirt entering the packaging bag 3 and affecting the quality of the food.

[0045] In some technical solutions of the present invention, the limiting mechanism 5 includes a transmission wheel 501. An installation chamber is formed on the side wall of the position adjustment frame 4. A through groove communicating with the installation chamber is formed on the side wall of the position adjustment frame 4 facing away from the installation frame 6. The transmission wheel 501 is rotatably arranged in the installation chamber. A limiting structure is installed on the transmission wheel 501. A driving member for driving the transmission wheel 501 to rotate is arranged in the installation chamber. The driving member is a motor. The motor is fixed in the installation chamber by bolts. The motor is in transmission connection with the transmission wheel 501 through a coupling. When the motor is started, the transmission wheel 501 drives the limiting structure to move counterclockwise. At this time, the limiting structure will move out of the through groove and make a sweeping motion on the outer side of the packaging bag 3, so that the packaging bag 3 is kept in a relatively straight state as much as possible. When the motor drives the limiting structure to rotate 90°, the limiting mechanism 5 just moves to the upper part of the packaging bag 3 and is parallel to the upper end of the packaging bag 3. And the two limiting mechanisms 5 are respectively located on the side walls of the two position adjustment frames 4 facing away from each other, and the two limiting mechanisms 5 are arranged in a staggered manner with the two position adjustment frames 4 as the symmetry axis. When the limiting structures located in the two limiting mechanisms 5 respectively smooth the side walls of the packaging bag 3 from the bottom, the two sides of the packaging bag 3 can be kept in a relatively flat state.

[0046] In some technical solutions of the present invention, the limiting structure includes a plurality of rod sections 503 spliced in sequence. A hinge 505 is installed between any two adjacent rod sections 503. One of the rod sections 503 at the end is fixedly connected to the transmission wheel 501. And this hinge can only rotate in one direction and has a dead point and can only rotate 180°, that is, rotate in a specific direction. When the two position adjustment frames 4 approach each other under the action of the displacement seat 8, the rod section 503 of the limiting structure far from the transmission wheel 501 and the two ends of the rod section 503 installed in the installation chamber are squeezed by the two position adjustment frames 4, causing it to bend outward to form a semi-circular structure and guiding the two sides of the packaging bag 3 to move in opposite directions, so as to expand a larger inlet and outlet at the opening of the packaging bag 3, facilitating the entry and exit of materials.

[0047] In some technical solutions of the present invention, suction cups 504 are installed on each rod section 503. A corrugated pipe 506 communicating with the suction cups 504 is disposed inside the rod section 503, and any two adjacent corrugated pipes 506 communicate with each other. The corrugated pipe 506 communicates with an external negative pressure device. When the two sides of the packaging bag 3 are bent outward along with the limiting structure by the provided suction cups 504 to form a semi-circular structure, the suction cups 504 can adsorb the side wall of the packaging bag 3, improving the connection strength between the side wall of the packaging bag 3 and the limiting structure during the above movement process, ensuring that the two side walls of the packaging bag 3 expand along a predetermined direction under the guidance of the limiting structure, and forming a relatively large inlet and outlet, facilitating the entry and exit of materials. And through the above structure, there will be no problem of material accumulation at the inlet and outlet of the packaging bag 3, which may cause the materials to adhere to the packaging position of the packaging bag 3 during the later packaging process, affecting the packaging effect of the packaging bag 3.

[0048] In some technical solutions of the present invention, a second inclined surface is provided on the side wall of the displacement seat 8 facing away from the clamping plate 7; a first rod body 603 penetrates through the top of the mounting frame 6, and the first rod body 603 abuts against the second inclined surface. The reverse extension line of the first inclined surface intersects with the reverse extension line of the second inclined surface to form an acute angle and faces the adjustment frame 4.

[0049] A first spring 604 connected to the mounting frame 6 is sleeved on the side wall of the first rod body 603. A limiting plate 605 is installed at the free end of the first rod body 603. A sliding groove is provided on the side wall of the adjustment frame 4 facing the limiting plate 605, and the end of the limiting plate 605 is slidably disposed in the sliding groove.

[0050] When the telescopic end of the first push rod 602 gradually pushes the displacement seat 8 towards the adjustment frame 4, the first rod body 603 moves upward in the vertical direction under the push of the second inclined surface provided on the displacement seat 8, the first spring 604 is compressed, the first rod body 603 will push the limiting plate 605 to move in the vertical direction, and push the adjustment frame 4 slidably connected thereto to move in the vertical direction, thereby applying an upward pulling force in the vertical direction to the packaging bag 3 clamped between the two adjustment frames 4, so that the packaging bag 3 is in a straightened state, ensuring that the two sides of the packaging bag 3 expand along a predetermined direction under the guidance of the limiting structure, and forming a relatively large inlet and outlet, facilitating the entry and exit of materials.

[0051] During the process of the limiting plate 605 pushing the adjustment frame 4 to move upward in the vertical direction, the limiting plate 605 gradually moves out of the adjustment frame 4 under the push of the displacement seat 8, but the limiting plate 605 will not be completely separated from the adjustment frame 4.

[0052] Preferably, a rubber block with a relatively large frictional force is provided on the wheel surface of the provided first guide wheel 11, so as to improve the frictional force when the first guide wheel 11 contacts the packaging bag 3.

[0053] Preferably, the middle part of the displacement seat 8 is an isosceles trapezoidal block, and the small-diameter end of the displacement seat 8 faces the position-adjusting frame 4. A first top block is provided on the upper base of the displacement seat 8, and a second top block integrally formed therewith is provided on the lower base of the displacement seat 8. The first inclined surface and the second inclined surface are respectively the two inclined sides of the displacement seat 8.

[0054] In some technical solutions of the present invention, two limiting rods 708 are fixedly installed on the fixed seat 705 by welding. The limiting rods 708 are all slidably arranged in the mounting frame 6 through sliding rings. Fourth springs 707 that abut against the mounting frame 6 are sleeved on the outer side walls of the limiting rods 708. A first push block 703 is installed between the clamping plate 7 and the second push block 704. The first push block 703 is slidably arranged in the mounting frame 6 along the horizontal direction through a slide bar. The slide bar is integrally formed with the lower inner wall of the mounting frame 6. A fourth inclined surface parallel to the third inclined surface is provided on the first push block 703. The third inclined surface and the fourth inclined surface form a concave-convex matching relationship. Moreover, the large-diameter end of the second push block 704 faces the small-diameter end of the first push block 703. Both the second push block 704 and the first push block 703 are block structures with an isosceles trapezoidal cross-section. A fifth inclined surface is provided on the side wall of the first push block 703 opposite to the clamping plate 7. The fifth inclined surface abuts against the clamping plate 7. A sixth inclined surface parallel to the fifth inclined surface is provided on the side wall of the fixed seat 705.

[0055] And a limiting convex block is integrally formed on the first push block 703; when the second push block 704 forces the clamping plate 7 to move to the limit position through the first push block 703, the clamping plate 7 stops moving. At this time, the second push block 704 continues to push the first push block 703 closer to the fixed seat 705 until the limiting convex block integrally formed on the first push block 703 abuts against the fixed seat 705. Then, the second push block 704 will push the fixed seat 705 closer to the middle of the packaging bag 3, so that the bottom of the packaging bag 3 can also expand together with the upper part of the packaging bag 3, avoiding the bottom of the packaging bag 3 from hindering the expansion of the upper part of the packaging bag 3, ensuring the expansion effect of the upper part of the packaging bag 3, ensuring that both sides of the packaging bag 3 expand along the established direction under the guidance of the limiting structure, and forming a relatively large inlet and outlet for the convenient entry and exit of materials.

[0056] A packaging machine includes a bag-opening mechanism for the packaging bag, so that the above structure can be adapted to different structures of packaging machines, increasing the adaptability of this structure. The bag-opening mechanism can be installed in the transmission mechanism 1 of the packaging machine. The transmission mechanism 1 is a rotary transmission mechanism. This technology is a conventional technology and will not be elaborated here.

[0057] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A bag opening mechanism for a packaging bag, characterized in that: The invention comprises a casing (2), wherein two mounting frames (6) are mounted in the casing (2), and a first clamping mechanism for fixing a packaging bag (3) is mounted at the bottom of each mounting frame (6); two adjusting frames (4) are arranged in pairs in the casing (2), and limiting grooves are arranged on opposite side walls of the two adjusting frames (4), and second clamping mechanisms for clamping the side walls of the packaging bag (3) are arranged in each limiting groove; limiting mechanisms (5) for limiting the movement of the packaging bag (3) are arranged on the side walls of the two adjusting frames (4) that are away from each other, and a driving mechanism for driving the first clamping mechanism and the adjusting frame (4) on the same side to move synchronously is arranged in each mounting frame (6); The limiting mechanism comprises a transmission wheel (501), a mounting chamber is provided on a side wall of the positioning frame (4), a through slot connected to the mounting chamber is provided on a side wall of the positioning frame (4) away from the mounting frame (6), the transmission wheel (501) is rotatably arranged in the mounting chamber, a limiting structure is installed on the transmission wheel (501), and a driving member for driving the transmission wheel (501) to rotate is provided in the mounting chamber; The limiting structure comprises a plurality of rod sections (503) connected in sequence, a hinge (505) being installed between any two adjacent rod sections (503), and one of the rod sections (503) at the end is fixedly connected to the transmission wheel (501); Suction cups (504) are installed on the rod sections (503), and bellows (506) communicating with the suction cups (504) are passed through the rod sections (503), and any two adjacent bellows (506) are communicated with each other.

2. A bag opening mechanism for a packaging bag according to claim 1, characterized in that: The first clamping mechanism comprises a fixed seat (705) installed in the mounting frame (6), a clamping seat (706) is installed on the side wall of the fixed seat (705), a clamping plate (7) is slidably provided on the side wall of the fixed seat (705), and the clamping plate (7) is transmission-connected to the driving mechanism; a third mounting rod (14) is installed on the side wall of the clamping plate (7) opposite to the clamping seat (706), a third guide wheel (15) is rotatably provided on the third mounting rod (14), a second mounting rod (12) is installed on the side wall of the clamping seat (706) opposite to the clamping plate (7), and a second guide wheel (13) is rotatably provided on the second mounting rod (12); a mounting groove is opened in the fixed seat (705), and a return spring (16) connected to the clamping plate (7) is installed in the mounting groove.

3. The bag opening mechanism of a packaging bag according to claim 1, characterized in that: The second clamping mechanism comprises a plurality of first mounting rods (9) respectively mounted on two opposite side walls of the limiting groove, each of the first mounting rods (9) being rotatably provided with a first guide wheel (11), the circle on which the first guide wheel (11) is located being tangent to the packaging bag (3); and each of the outer side walls of the first mounting rods (9) being sleeved with a second spring (10) connected to the positioning frame (4).

4. The bag opening mechanism of a packaging bag according to claim 2, characterized in that: The driving mechanism comprises a mounting seat (601) slidably arranged on the mounting frame (6) in a horizontal direction, and a displacement seat (8) abutting against the position adjustment frame (4) is mounted on the mounting seat (601); A first inclined surface is provided on the side wall of the displacement seat (8) opposite to the clamping plate (7), and a reverse extension line of the first inclined surface intersects with a reverse extension line of the clamping plate (7) to form an acute angle; A second rod (702) abutting against the first inclined surface is provided through the bottom of the mounting frame (6), and a third spring (701) connected to the mounting frame (6) is sleeved on the side wall of the second rod (702); A second push block (704) is mounted on the side wall of the second rod body (702); a third inclined surface is formed on the side wall of the second push block (704) opposite to the clamping plate (7); a reverse extension line of the third inclined surface intersects with a reverse extension line of the clamping plate (7) to form an acute angle; and a first push rod (602) connected to the mounting seat (601) is mounted on the mounting frame (6).

5. The bag opening mechanism of a packaging bag according to claim 4, characterized in that: A second inclined surface is formed on the side wall of the displacement seat (8) facing away from the clamping plate (7); a first rod body (603) is passed through the top of the mounting frame (6), the first rod body (603) and the second inclined surface are in contact with each other, and the reverse extension line of the first inclined surface and the reverse extension line of the second inclined surface intersect at an acute angle and are opposite to the positioning frame (4); A first spring (604) connected to the mounting frame (6) is sleeved on the side wall of the first rod body (603); a limit plate (605) is mounted on the free end of the first rod body (603); a sliding groove is provided on the side wall of the position adjustment frame (4) opposite to the limit plate (605); and an end of the limit plate (605) is slidably disposed in the sliding groove.

6. The bag opening mechanism of a packaging bag according to claim 4, characterized in that: Two limiting rods (708) are installed on the fixed seat (705), and the limiting rods (708) are slidably arranged in the mounting frame (6). The outer side walls of the limiting rods (708) are sleeved with fourth springs (707) that abut against the mounting frame (6). A first push block (703) is installed between the clamping plate (7) and the second push block (704). The first push block (703) is slidably arranged in the mounting frame (6). The first push block (703) is provided with a fourth inclined surface that is parallel to the third inclined surface. The side wall of the first push block (703) is provided with a fifth inclined surface that abuts against the clamping plate (7). The side wall of the fixed seat (705) is provided with a sixth inclined surface that is parallel to the fifth inclined surface.

7. A packaging machine, characterized in that: It comprises a packaging bag opening mechanism as described in any one of claims 1 to 6.

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