Bag opening mechanism of packaging bag and packaging machine

Abstract

The invention provides a packaging bag opening mechanism and a packaging machine, relates to the packaging bag opening technology, and particularly discloses a machine shell, two mounting frames are mounted in the machine shell, and first clamping mechanisms used for fixing packaging bags are mounted at the bottoms of the mounting frames; two position adjusting frames are arranged in the machine shell in pairs, limiting grooves are formed in the opposite side walls of the two position adjusting frames, and second clamping mechanisms used for clamping the side walls of the packaging bags are arranged in the limiting grooves; limiting mechanisms used for limiting movement of the packaging bags are arranged on the side walls, deviating from each other, of the two position adjusting frames, and driving mechanisms used for driving the first clamping mechanisms located on the same side and the position adjusting frames to move synchronously are arranged in the mounting frames. The problem that the packaging bag cannot be normally opened due to the fact that the middle of the packaging bag is distorted and inclined or deflects towards the same side under the condition that the middle of the packaging bag is not supported is solved; by means of the device, materials are not accumulated at the inlet and outlet of the packaging bag, and the materials are not attached to the packaging position of the packaging bag in 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: 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.

[0007] 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.

[0008] 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.

[0009] 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; 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; 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; 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.

[0010] 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.

[0011] In some technical solutions of the present invention, a second inclined surface is provided on the side wall of the displacement seat away from the clamping plate; a first rod body is passed through the top of the mounting frame, the first rod body and the second inclined surface abut against each other, and 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 is opposite to the positioning frame; A first spring connected to the mounting frame is sleeved on the side wall of the first rod body, a limiting plate is installed on the free end of the first rod body, a sliding groove is opened on the side wall of the adjustment frame opposite to the limiting plate, and the end of the limiting plate is slidably arranged in the sliding groove.

[0012] In some technical solutions of the present invention, the limiting structure includes a plurality of rod sections spliced ​​in sequence, and a hinge is installed between any two adjacent rod sections.

[0013] In some technical solutions of the present invention, suction cups are installed on the rod sections, and bellows connected to the suction cups are passed through the rod sections, and any two adjacent bellows are connected to each other.

[0014] In some technical schemes of the present invention, two limit rods are installed on the fixed seat, and the limit rods are slidably arranged in the mounting frame. The outer side walls of the limit rods are sleeved with a fourth spring that abuts against the mounting frame. A first push block is installed between the clamp and the second push block. The first push block is slidably arranged in the mounting frame. The first push block is provided with a fourth inclined surface parallel to the third inclined surface, the side wall of the first push block is provided with a fifth inclined surface abutting against the clamp, and the side wall of the fixed seat is provided with a sixth inclined surface parallel to the fifth inclined surface.

[0015] 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 to prevent the bottom of the packaging bag from deflecting, thereby improving the overall stability of the packaging bag during the material filling process; two positioning racks are arranged in pairs in the housing, and the two positioning racks are provided with rectangular cross-sectional limiting grooves on the opposite side walls, and the limiting grooves are provided with second clamping mechanisms for clamping the side walls of the packaging bag; the two sides of the packaging bag are placed in a relatively fixed state, and the two sides of the packaging bag are ensured to maintain a relatively vertical state; the packaging bag is prevented from coming out of the state when the two sides of the packaging bag are moved toward the middle under the control of the above structure. The bag is twisted and skewed, which affects the bag opening effect of the open end of the packaging bag; the side walls of the two adjustment frames that are away from each other are provided with limiting mechanisms for limiting the movement of the packaging bag; the limiting mechanisms can provide support for the packaging bag that is not in the bag opening state, to avoid the middle part of the packaging bag from twisting and skew or deflecting to the same side without support, resulting in the packaging bag being unable to be opened normally; the above structure will not cause the problem of material accumulation at the inlet and outlet of the packaging bag, resulting in the material sticking to the packaging part of the packaging bag during the later packaging process, affecting the packaging effect of the packaging bag. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the installation structure of the bag opening mechanism in the present invention.

[0017] Figure 2 It is a three-dimensional structural diagram of the bag opening mechanism in the present invention.

[0018] Figure 3 It is a schematic diagram of the internal structure of the bag opening mechanism in the present invention.

[0019] Figure 4 It is a schematic diagram of the rear view structure of the first clamping mechanism in the present invention.

[0020] Figure 5 It is a schematic diagram of the top structure of the bag opening mechanism in the present invention.

[0021] Figure 6 It is a top view of the structure of the position adjustment frame in the present invention.

[0022] Figure 7 It is a partial cross-sectional structural schematic diagram of the first clamping mechanism in the present invention.

[0023] Figure 8 It is a schematic diagram of a partial cross-sectional structure of the limiting structure in the present invention.

[0024] 1. Transmission mechanism; 2. Casing; 3. Packaging bag; 4. Position adjustment frame; 5. Limiting mechanism; 501. Transmission wheel; 503. Rod section; 504. Suction cup; 505. Hinge; 506. Bellows; 6. Mounting frame; 601. Mounting seat; 602. First push rod; 603. First rod body; 604. First spring; 605. Limiting plate; 7. Clamp; 701. Third spring; 702. Second rod body; 703. First push block; 704. Second push block; 705. Fixed seat; 706. Clamp seat; 707. Fourth spring; 708. Limiting 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. Reset spring. DETAILED DESCRIPTION

[0025] In order to make the purpose, 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 in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0026] Accordingly, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention. Specific implementation of the drawings.

[0027] Embodiment The present invention provides an opening mechanism for a packaging bag, as Figure 1 , Figure 2 shown, including a machine housing 2, the machine housing 2 is a special-shaped frame structure, which is bent and formed by a bending device, and the machine housing 2 has an installation chamber; two mounting brackets 6 are installed in the machine housing 2, and the two mounting brackets 6 are respectively fixedly installed on both sides of the machine housing 2 by bolts, and the mounting bracket 6 is integrally in a "C" shape structure; a first clamping mechanism is installed at the bottom of the mounting bracket 6, 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 filling process of the material; two positioning frames 4 are provided in pairs in the machine housing 2, and second clamping mechanisms for clamping the side walls of the packaging bag 3 are provided in the limiting grooves with rectangular cross-sections on the opposite side walls of the two positioning frames 4; so that the two sides of the packaging bag 3 are in a relatively fixed state and ensure that the two sides of the packaging bag 3 maintain a relatively vertical state; to avoid the situation that the two sides of the packaging bag 3 are distorted and skewed when approaching the middle under the control of the above structure, which affects the opening effect of the opening end of the packaging bag 3.

[0028] Limiting mechanisms 5 for restricting the movement of the packaging bag 3 are provided on the opposite side walls of the two positioning frames 4; the limiting mechanism 5 can provide a supporting force for the packaging bag 3 that is not in the opened state, avoiding the situation that the middle part of the packaging bag 3 is distorted, skewed or deflected to the same side without support, resulting in the situation that the packaging bag 3 cannot be opened normally.

[0029] A driving mechanism for driving the first clamping mechanism on the same side and the positioning frame 4 to move synchronously is provided in each of the mounting brackets 6. 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 towards the middle of the packaging bag 3.

[0030] Preferably, the length of the positioning frame 4 is about one-third of the packaging bag 3.

[0031] In some technical solutions of the present invention, the first clamping mechanism includes a fixing seat 705 installed in the mounting frame 6, a clamping seat 706 is fixedly installed on the side wall of the fixing seat 705 by bolts, a mounting opening adapted to the clamping plate 7 is opened on the side wall of the fixing seat 705, the clamping plate 7 is inserted into the mounting opening, the mounting opening is rectangular, and the clamping plate 7 is connected to the driving mechanism by transmission; a through hole is opened on the side wall opposite to the clamping seat 706, a third mounting rod 14 is installed in the through hole, and the third mounting rod 14 is threadedly connected to the through hole; the third mounting rod 14 is rotated by the shaft A third guide wheel 15 is provided, and 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, and a second guide wheel 13 is provided on the second mounting rod 12 by rotating the shaft rod; a mounting groove is opened in the fixing seat 705, and a reset spring 16 connected to the clamping plate 7 is installed in the mounting groove, and a baffle connected to the reset spring 16 is provided on the clamping plate 7, and the baffle and the clamping plate 7 are perpendicular to each other; through the above structure, the clamping plate 7 can return to its initial position after not being subjected to the thrust applied by the driving mechanism, thereby releasing the clamping of the bottom of the packaging bag 3.

[0032] Preferably, the installation opening can be obliquely arranged on the side wall of the fixing seat 705. After the above operation, the clamping plate 7 can be moved obliquely on the fixing seat 705, so that the lower part of the packaging bag 3 is fixed more firmly.

[0033] In some technical schemes 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 are passed through the side walls of the limiting groove, and the first mounting rods 9 are each provided with a first guide wheel 11 which is rotated by an axial rod, and the circle where the first guide wheel 11 is located is tangent to the horizontal plane of the packaging bag 3; the outer side walls of the first mounting rods 9 are each provided with a second spring 10 connected to the positioning frame 4. In addition, the two first guide wheels 11 placed in the limiting groove and opposite to each other have a gap to accommodate the outer edge of the packaging bag 3 under the action of the second spring 10, which makes it easy for the outer edge of the packaging bag 3 to enter between the two first guide wheels 11, and is beneficial for the above structure to apply a clamping force to the outer edge of the packaging bag 3. The driving mechanism can also push the adjusting frame 4 to bring the side edges of the packaging bag 3 placed in the limiting groove closer to the middle of the packaging bag 3, thereby placing certain restrictions on the side walls of the packaging bag 3 and ensuring that the two sides of the packaging bag 3 move in a predetermined direction when approaching the middle, thereby improving the stability of the above structure when the two sides of the packaging bag 3 expand in opposite directions to form an opening with an enlarged diameter.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] In some technical solutions of the present invention, the limiting mechanism 5 includes a transmission wheel 501, an installation chamber is opened on the side wall of the positioning frame 4, a through groove connected to the installation chamber is opened on the side wall of the positioning frame 4 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, and a driving member for driving the transmission wheel 501 to rotate is provided in the installation chamber. The driving member is a motor, which is fixed in the installation chamber by bolts. The motor and the transmission wheel 501 are driven by a coupling. When the motor is started, the transmission wheel 501 drives the limiting structure to move in the counterclockwise direction. At this time, the limiting structure will move out of the through groove and sweep the outside of the packaging bag 3 to keep the packaging bag 3 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 adjusting frames 4 that are away from each other, and the two limiting mechanisms 5 are staggered with the two adjusting frames 4 as the symmetry axis. When the limiting structures respectively located in the two limiting mechanisms 5 smooth the side walls of the packaging bag 3 from the bottom of the packaging bag 3, the two sides of the packaging bag 3 can be kept in a relatively flat state.

[0040] In some technical solutions of the present invention, the limiting structure includes a plurality of rod segments 503 spliced ​​in sequence, and a hinge 505 is installed between any two adjacent rod segments 503, and one of the rod segments 503 located at the end is fixedly connected to the transmission wheel 501. Moreover, the hinge can only rotate in one direction, has a dead point, and can only rotate 180°, that is, rotate in a specific direction; when the two adjustment frames 4 approach each other under the action of the displacement seat 8, the rod segment 503 in the limiting structure away from the transmission wheel 501 and the two ends of the rod segment 503 installed in the installation chamber are squeezed by the two adjustment frames 4, so that they bend outward to form a semi-circular structure, and guide the two sides of the packaging bag 3 to move in opposite directions, so that the opening of the packaging bag 3 expands to form a larger inlet and outlet, which is convenient for the entry and exit of materials.

[0041] In some technical solutions of the present invention, suction cups 504 are installed on the rod sections 503, and bellows 506 connected to the suction cups 504 are inserted into the rod sections 503, and any two adjacent bellows 506 are connected to each other. The bellows 506 are connected to the external negative pressure equipment, and the suction cups 504 are set to make the two sides of the packaging bag 3 bend outward along the limiting structure to form a semi-annular structure. The suction cups 504 can adsorb the side walls of the packaging bag 3, thereby improving the connection strength between the side walls 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 in a predetermined direction under the guidance of the limiting structure, and open a larger inlet and outlet to facilitate the entry and exit of materials. In addition, the above structure will not cause the problem of material accumulation at the inlet and outlet of the packaging bag 3, causing the material to adhere to the packaging part of the packaging bag 3 during the later packaging process, affecting the packaging effect of the packaging bag 3.

[0042] In some technical solutions of the present invention, a second inclined surface is provided on the side wall of the displacement seat 8 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 intersects with the reverse extension line of the second inclined surface to form an acute angle and is 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 limiting plate 605 is installed on the free end of the first rod body 603, a sliding groove is opened on the side wall of the adjustment frame 4 opposite to the limiting plate 605, and the end of the limiting plate 605 is slidably set in the sliding groove.

[0043] When the telescopic end of the first push rod 602 gradually pushes the displacement seat 8 toward the adjustment frame 4, the first rod body 603 moves upward in the vertical direction under the push of the second inclined surface set on the displacement seat 8, the first spring 604 is compressed, and 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 a vertical upward pulling force to the packaging bag 3 clamped between the two adjustment frames 4, so that the packaging bag 3 is in a stretched state, ensuring that the two sides of the packaging bag 3 expand in a predetermined direction under the guidance of the limiting structure, and open a larger inlet and outlet to facilitate the entry and exit of materials.

[0044] When the limiting plate 605 pushes the positioning frame 4 to move vertically upward, the limiting plate 605 gradually moves out of the positioning frame 4 under the push of the displacement seat 8 , but the limiting plate 605 will not be completely separated from the positioning frame 4 .

[0045] Preferably, a rubber block with greater friction is provided on the wheel surface of the first guide wheel 11 , so that the friction between the first guide wheel 11 and the packaging bag 3 can be increased.

[0046] Preferably, the middle part of the displacement seat 8 is an isosceles trapezoidal block, and the small diameter end of the displacement seat 8 is opposite to the adjustment frame 4. A first top block is provided on the upper bottom edge of the displacement seat 8, and a second top block integrally formed with the displacement seat 8 is provided on the lower bottom edge of the displacement seat 8, and the first inclined surface and the second inclined surface are two inclined sides of the displacement seat 8 respectively.

[0047] In some technical solutions of the present invention, two limit rods 708 are fixedly installed on the fixed seat 705 by welding. The limit rods 708 are slidably set in the mounting frame 6 through slip rings. The outer side walls of the limit 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 set in the mounting frame 6 in the horizontal direction through a slide bar. The slide bar is integrally formed with the inner wall of the lower end of the mounting frame 6. The first push block A fourth inclined surface parallel to the third inclined surface is provided on 703, the third inclined surface and the fourth inclined surface form a concave-convex matching relationship, and the large diameter end of the second push block 704 is opposite to the small diameter end of the first push block 703, the second push block 704 and the first push block 703 are both block structures with isosceles trapezoidal cross-sections, a fifth inclined surface is provided on the side wall of the first push block 703 opposite to the splint 7, the fifth inclined surface abuts against the splint 7, and a sixth inclined surface parallel to the fifth inclined surface is provided on the side wall of the fixed seat 705.

[0048] And a limiting protrusion is integrally formed on the first pushing block 703; when the second pushing block 704 forces the clamping plate 7 to move to the limit position through the first pushing block 703, the clamping plate 7 no longer moves. At this time, the second pushing block 704 continues to push the first pushing block 703 to approach the fixing seat 705 until the limiting protrusion integrally formed on the first pushing block 703 abuts against the fixing seat 705, and the second pushing block 704 will push the fixing seat 705 to approach 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 hindering the expansion of the upper part of the packaging bag 3, so that the expansion effect of the upper part of the packaging bag 3 is guaranteed, ensuring that the two sides of the packaging bag 3 expand in a predetermined direction under the guidance of the limiting structure, and open a larger inlet and outlet to facilitate the entry and exit of materials.

[0049] A packaging machine includes a bag opening mechanism for packaging bags, so that the above structure can be adapted to packaging machines of different structures, thereby increasing the adaptability of the structure. The bag opening mechanism can be installed in a transmission mechanism 1 of the packaging machine, and the transmission mechanism 1 is a rotary transmission mechanism. This technology is conventional and will not be described in detail here.

[0050] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in 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 provided 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 provided in each limiting groove; limiting mechanisms (5) for limiting the movement of the packaging bag (3) are provided 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 provided in each mounting frame (6).

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. A bag opening mechanism for a packaging bag according to any one of claims 1 to 4, characterized in that: 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.

6. 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.

7. The bag opening mechanism of a packaging bag according to claim 5, characterized in that: The limiting structure comprises a plurality of rod sections (503) spliced ​​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).

8. The bag opening mechanism of a packaging bag according to claim 7, characterized in that: 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.

9. 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.

10. A packaging machine, characterized in that: It comprises a packaging bag opening mechanism as described in any one of claims 1 to 9.

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