Bag opening device capable of rapidly replacing bag opening head for packaging machine

Abstract

The utility model relates to the technical field of packaging machines, and provides a packaging machine bag opening device capable of rapidly replacing a bag opening head, which comprises a bag opening mechanism, the bag opening mechanism comprises a cross rod, at least one bag opening head mechanism is arranged on the cross rod, the bag opening head mechanism comprises a sliding block, a negative pressure air source connector is arranged in the sliding block, and the negative pressure air source connector is connected with the cross rod. The side wall of the negative pressure air source connector is provided with a first semi-conical block, one end of the negative pressure air source connector is provided with an L-shaped rod, the side wall of the L-shaped rod is provided with a second semi-conical block, and the side wall of the sliding block is sleeved with a limiting pin. According to the utility model, a locking mechanism of the first semi-conical block and the second semi-conical block is adopted between the negative pressure air source connector in the sliding block and the L-shaped rod, and tight fitting and rapid locking are realized through the conical groove in the limiting pin, so that when the bag opening head is replaced, the first semi-conical block and the second semi-conical block can be easily separated only by loosening the limiting pin, and the bag opening head can be conveniently replaced. Therefore, the old bag opening head can be quickly detached.

Description

Technical Field

[0001] This utility model relates to the field of packaging machine technology, and in particular to a bag opening device for packaging machines with quick-change bag opening heads. Background Technology

[0002] In the packaging industry, packaging machines are indispensable equipment for achieving automated product packaging. However, with prolonged continuous operation and high-intensity working environments, the key component of packaging machines—the bag opening head—is prone to damage due to wear, aging, or accidents. Once the bag opening head malfunctions, it not only affects packaging quality but may also cause the entire production line to stop, resulting in significant economic losses for the company.

[0003] The interior space of packaging machines is usually very small, which brings additional difficulties to the replacement of the bag opening head. The limited operating space makes it difficult for maintenance personnel to operate, increasing the time cost and technical difficulty of the replacement process. At the same time, the packaging head is particularly inconvenient when it needs to be replaced, and disassembly and reinstallation require professional skills and special tools.

[0004] The purpose of this invention is to solve the problem that the bag opening head is not easy to replace in existing packaging machines. Utility Model Content

[0005] The purpose of this invention is to solve the problem of the difficulty in replacing the bag opening head in existing packaging machines. This invention adopts the following technical solution:

[0006] A bag-opening device for a packaging machine with a quick-change bag-opening head includes a bag-opening mechanism. The bag-opening mechanism includes a crossbar, on which at least one bag-opening head mechanism is mounted. The bag-opening head mechanism includes a slider, in which a negative pressure air source connector is disposed. A first semi-conical block is disposed on the side wall of the negative pressure air source connector, and an L-shaped rod is disposed at one end of the negative pressure air source connector. A second semi-conical block is mounted on the side wall of the L-shaped rod. A limiting pin is sleeved on the side wall of the slider, and the limiting pin is threadedly connected to the slider. A conical groove is formed at one end of the limiting pin.

[0007] As described above, in a packaging machine, a quick-change bag-opening device for a bag-opening head is provided, wherein a limiting groove is provided on the top of the slider, the width of the limiting groove is the same as the diameter of the second semi-conical block, and the second semi-conical block is slidably connected to the limiting groove.

[0008] As described above, a quick-change bag opening device for a packaging machine has a slot on the slider, a crossbar fitted inside the slot, the crossbar being slidably connected to the slot, and a threaded hole on one side of the slider.

[0009] As described above, in a packaging machine, a quick-change bag-opening device for a bag-opening head is provided, wherein the shape of the slot matches the shape of the cross-section of the crossbar, and the cross-section of the crossbar is rectangular.

[0010] As described above, in a packaging machine with a quick-change bag opening head, a rubber sealing ring is provided at the end of the negative pressure air source connector that connects to the L-shaped rod.

[0011] As described above, a quick-change bag-opening device for a packaging machine has a handle installed at one end of the limiting pin.

[0012] As described above, a quick-change bag opening device for a packaging machine has a suction cup installed at one end of the L-shaped rod, a retaining ring inside the suction cup, and a groove at one end of the L-shaped rod that engages with the retaining ring.

[0013] As described above, in a packaging machine, a quick-change bag-opening device for a bag-opening head is provided, wherein the first semi-conical block and the second semi-conical block have the same specifications, and the first semi-conical block and the second semi-conical block can form a complete cone. The diameter of the circular opening of the conical groove is equal to or less than the diameter of the complete cone formed by the first semi-conical block and the second semi-conical block.

[0014] Implementing the embodiments of this utility model has the following beneficial effects:

[0015] 1. In this utility model, the negative pressure air source connector inside the slider and the L-shaped rod employ a locking mechanism of a first semi-conical block and a second semi-conical block, achieving tight fit and quick locking through the conical groove on the limiting pin. This design allows for easy separation of the first and second semi-conical blocks by simply loosening the limiting pin when replacing the bag opening head, thus quickly disassembling the old bag opening head; when installing a new bag opening head, the reverse steps are followed, inserting the new component and tightening the limiting pin to complete the fixation. The entire process is simple and quick, requiring no complex tools or technical support, greatly shortening replacement time, reducing economic losses caused by downtime, and improving the overall efficiency and flexibility of the production line.

[0016] In summary, this utility model solves the problem of the bag opening head being difficult to replace in existing packaging machines. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1This is a schematic diagram of the overall structure of a bag-opening device for a packaging machine with a quick-change bag-opening head according to the present invention.

[0019] Figure 2 This is a cross-sectional view of a bag-opening device for a packaging machine with a quick-change bag-opening head, according to this utility model.

[0020] Figure 3 This is a schematic diagram of the opening head mechanism 12 of a quick-change bag opening head device for a packaging machine according to this utility model.

[0021] Figure 4 This is a cross-sectional view of the slider of a bag-opening device for a packaging machine with a quick-change bag-opening head, according to this utility model.

[0022] Figure 5 This is a schematic diagram of the limiting pin of a bag-opening device for a packaging machine with a quick-change bag-opening head according to this utility model. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] like Figures 1 to 5As shown, this utility model proposes a bag opening device for a packaging machine with a quick-change bag opening head, including a bag opening mechanism 1. The bag opening mechanism 1 includes a crossbar 11, on which at least one bag opening head mechanism 12 is installed. The bag opening head mechanism 12 includes a slider 121, and a negative pressure air source connector 125 is provided inside the slider 121. A first semi-conical block 1251 is provided on the side wall of the negative pressure air source connector 125. An L-shaped rod 126 is provided at one end of the negative pressure air source connector 125. The L-shaped rod 126 is hollow. A second semi-conical block 1261 is installed on the side wall of the L-shaped rod 126. A limiting pin 124 is sleeved on the side wall of the slider 121. The limiting pin 124 is threadedly connected to the slider 121. A conical groove 1242 is provided at one end of the limiting pin 124. The negative pressure air source connector 125 provides the necessary negative pressure to ensure the bag opener can stably grip and open the packaging bag. The degree to which the limiting pin 124 extends into the slider 121 can be adjusted by rotating the limiting pin 124. The conical groove 1242 presses against the first semi-conical block 1251 and the second semi-conical block 1261, making them fit tightly together, thereby locking the first semi-conical block 1251 and the second semi-conical block 1261, further realizing the locking connection between the negative pressure air source connector 125 and the L-shaped rod 126. Conversely, when disassembly is required, the limiting pin 124 is loosened to reduce pressure, allowing the semi-conical blocks to separate for quick disassembly and assembly. When replacing the bag opener, simply loosen the limiting pin 124 to separate the first semi-conical block 1251 from the second semi-conical block 1261, and then remove the old bag opener from the slider 121. When installing a new bag opener, follow the reverse steps: insert the new component, align the semi-conical block, and tighten the limit pin 124 to secure it. The entire process is simple and quick, requiring no complicated tools or technical support.

[0025] Furthermore, as a preferred embodiment of the invention and not a limitation thereof, a limiting groove 122 is formed at the top of the slider 121. The width of the limiting groove 122 is consistent with the diameter of the second semi-conical block 1261, and the second semi-conical block 1261 is slidably connected to the limiting groove 122. The consistency between the width of the limiting groove 122 and the diameter of the second semi-conical block 1261 ensures a precise fit between them. This design allows the second semi-conical block 1261 to be accurately embedded in the limiting groove 122 when installing or replacing the bag opening head, avoiding positional deviation. The tight fit between the limiting groove and the semi-conical block reduces possible lateral offset during installation and improves the positioning accuracy of the overall system.

[0026] Furthermore, as a preferred embodiment of the invention and not a limitation thereof, the slider 121 has a slot 123, the crossbar 11 is sleeved in the slot 123, the crossbar 11 is slidably connected to the slot 123, and a threaded hole 128 is provided on one side of the slider 121. The sliding connection design between the slot 123 and the crossbar 11 allows the slider 121 to slide freely along the crossbar 11, so that the bag opening mechanism 12 can be flexibly adjusted according to actual needs. The threaded hole 128 can be used to install adjusting screws. Fixing the slider 121 through the threaded hole 128 can prevent it from shifting due to vibration or impact during operation. This flexibility allows the packaging machine to quickly adapt to packaging bags of different specifications or sizes, improving the versatility and adaptability of the equipment. The slider 121 can be easily installed onto the crossbar 11 through the slot 123 without complicated alignment or fixing steps, greatly simplifying the installation process. When it is necessary to replace or maintain the bag opening mechanism 1, simply slide the slider 121 off the crossbar 11, which is simple and quick and reduces downtime. The shape of the slot 123 matches the shape of the cross-section of the crossbar 11, which is rectangular. Because the shape of the slot 123 perfectly matches the rectangular cross-section of the crossbar 11, the tight fit ensures that the slider 121 is accurately positioned during installation, preventing lateral offset or rotation and enhancing the stability and working accuracy of the entire device.

[0027] Furthermore, as a preferred embodiment of the present invention and not a limitation thereof, a rubber sealing ring 1252 is provided at the end of the negative pressure air source connector 125 that abuts with the L-shaped rod 126. The rubber sealing ring 1252 can effectively fill the tiny gap between the negative pressure air source connector 125 and the L-shaped rod 126, ensuring a complete seal when they are connected, and preventing negative pressure leakage. As a buffer layer, the rubber sealing ring 1252 reduces direct contact and friction between metal parts, reduces the wear rate, and extends the service life of the negative pressure air source connector 125 and the L-shaped rod 126.

[0028] Furthermore, as a preferred embodiment of the invention and not a limitation thereof, a handle 1241 is mounted on one end of the limiting pin 124. The handle 1241 provides a larger contact area, allowing the operator to grip the limiting pin 124 more easily and securely. By applying force through the handle 1241, the tightening or loosening action can be completed more effortlessly compared to directly rotating the limiting pin 124.

[0029] Furthermore, as a preferred embodiment of the invention and not a limitation thereof, a suction cup 127 is mounted on one end of the L-shaped rod 126. A retaining ring is provided within the suction cup 127, and a retaining groove is formed at one end of the L-shaped rod 126 to engage with the retaining ring. The design of the retaining ring and groove allows the suction cup 127 to be quickly and easily removed and installed from the L-shaped rod 126 without complex tools or steps, greatly simplifying the maintenance and replacement process. Different specifications of suction cups can be quickly replaced according to different packaging materials or sizes, improving the flexibility and adaptability of the equipment.

[0030] Furthermore, as a preferred embodiment of the invention and not a limitation thereof, the first semi-conical block 1251 and the second semi-conical block 1261 have the same specifications, and the first semi-conical block 1251 and the second semi-conical block 1261 can form a complete cone. The diameter of the circular opening of the conical groove 1242 is smaller than the diameter of the complete cone formed by the first semi-conical block 1251 and the second semi-conical block 1261. Because the diameter of the circular opening of the conical groove 1242 is smaller than the diameter of the complete cone, this design achieves an interference fit, ensuring a tight connection when the first and second semi-conical blocks are embedded in the conical groove 1242. The interference fit allows the conical groove to apply greater pressure to the first and second semi-conical blocks when the limiting pin 124 is tightened, enhancing the locking effect and preventing the parts from loosening or falling off. The smaller circular opening forces the first and second semi-conical blocks to be precisely aligned during the embedding process, reducing positional deviations during installation and ensuring highly consistent positioning every time the bag opening is changed.

[0031] Optionally, in some embodiments, the first semi-conical block 1251 and the second semi-conical block 1261 have the same specifications, and the diameter of the circular opening of the conical groove 1242 is equal to the diameter of the complete cone formed by the first semi-conical block 1251 and the second semi-conical block 1261. The fact that the diameter of the circular opening of the conical groove 1242 is equal to the diameter of the complete cone ensures that the first and second semi-conical blocks can be accurately embedded in the conical groove 1242, reducing possible positional deviations during installation. The fact that the diameter of the circular opening is equal to the diameter of the complete cone ensures maximum contact area between the first and second semi-conical blocks and the conical groove 1242, resulting in more uniform pressure distribution and enhanced connection stability. The fact that the diameter of the circular opening of the conical groove 1242 is equal to the diameter of the complete cone reduces hard contact and friction between components, lowers the wear rate, and thus extends the service life of the bag-opening mechanism.

[0032] Example 1:

[0033] A bag opening device for a packaging machine with a quick-change bag opening head includes a bag opening mechanism 1. The bag opening mechanism 1 includes a crossbar 11, on which at least one bag opening head mechanism 12 is mounted. The bag opening head mechanism 12 includes a slider 121, and a negative pressure air source connector 125 is provided inside the slider 121. A first semi-conical block 1251 is provided on the side wall of the negative pressure air source connector 125. An L-shaped rod 126 is provided at one end of the negative pressure air source connector 125. The L-shaped rod 126 is hollow. A second semi-conical block 1261 is installed on the side wall of the L-shaped rod 126. A limiting pin 124 is sleeved on the side wall of the slider 121. The limiting pin 124 is threadedly connected to the slider 121. A conical groove 1242 is provided at one end of the limiting pin 124. The negative pressure air source connector 125 provides the necessary negative pressure to ensure the bag opener can stably grip and open the packaging bag. The degree to which the limiting pin 124 extends into the slider 121 can be adjusted by rotating the limiting pin 124. The conical groove 1242 presses against the first semi-conical block 1251 and the second semi-conical block 1261, making them fit tightly together, thus locking the first semi-conical block 1251 and the second semi-conical block 1261, further achieving a locked connection between the negative pressure air source connector 125 and the L-shaped rod 126. Conversely, when disassembly is required, the limiting pin 124 is loosened to reduce pressure, allowing the semi-conical blocks to separate for quick assembly and disassembly. When replacing the bag opener, simply loosen the limiting pin 124 to separate the first semi-conical block 1251 from the second semi-conical block 1261, and then remove the old bag opener from the slider 121. When installing a new bag opener, follow the reverse steps: insert the new component, align the semi-conical block, and tighten the limit pin 124 to secure it. The entire process is simple and quick, requiring no complicated tools or technical support.

[0034] A limiting groove 122 is formed at the top of the slider 121. The width of the limiting groove 122 is the same as the diameter of the second semi-conical block 1261, and the second semi-conical block 1261 is slidably connected to the limiting groove 122. The matching width of the limiting groove 122 and the diameter of the second semi-conical block 1261 ensures a precise fit between them. This design allows the second semi-conical block 1261 to accurately embed into the limiting groove 122 during installation or replacement of the bag opening head, avoiding positional deviation. The tight fit between the limiting groove and the semi-conical block reduces potential lateral offset during installation, improving the overall system's positioning accuracy.

[0035] The slider 121 has a slot 123, and the crossbar 11 is fitted into the slot 123. The crossbar 11 is slidably connected to the slot 123. A threaded hole 128 is provided on one side of the slider 121. The sliding connection design between the slot 123 and the crossbar 11 allows the slider 121 to slide freely along the crossbar 11, enabling the bag opening mechanism 12 to be flexibly adjusted according to actual needs. The threaded hole 128 can be used to install adjusting screws. Fixing the slider 121 through the threaded hole 128 can prevent it from shifting due to vibration or impact during operation. This flexibility allows the packaging machine to quickly adapt to packaging bags of different specifications or sizes, improving the versatility and adaptability of the equipment. The slider 121 can be easily installed onto the crossbar 11 through the slot 123 without complicated alignment or fixing steps, greatly simplifying the installation process. When it is necessary to replace or maintain the bag opening mechanism 1, simply slide the slider 121 off the crossbar 11. The operation is simple and quick, reducing downtime. The shape of the slot 123 matches the shape of the cross-section of the crossbar 11, which is rectangular. Because the shape of the slot 123 perfectly matches the rectangular cross-section of the crossbar 11, the tight fit between them ensures that the slider 121 can be accurately positioned during installation, avoiding lateral offset or rotation, and enhancing the stability and working accuracy of the entire device.

[0036] A rubber sealing ring 1252 is provided at the end of the negative pressure air source connector 125 that mates with the L-shaped rod 126. The rubber sealing ring 1252 effectively fills the tiny gap between the negative pressure air source connector 125 and the L-shaped rod 126, ensuring a complete seal when they are connected and preventing negative pressure leakage. As a buffer layer, the rubber sealing ring 1252 reduces direct contact and friction between metal parts, lowers the wear rate, and extends the service life of the negative pressure air source connector 125 and the L-shaped rod 126.

[0037] A handle 1241 is installed at one end of the limit pin 124. The handle 1241 provides a larger contact area, allowing the operator to grip the limit pin 124 more easily and firmly. By applying force through the handle 1241, the tightening or loosening action can be completed with less effort compared to directly rotating the limit pin 124.

[0038] A suction cup 127 is mounted on one end of the L-shaped rod 126. A retaining ring is provided inside the suction cup 127, and a retaining groove is provided on one end of the L-shaped rod 126 to engage with the retaining ring. This retaining ring and groove design allows the suction cup 127 to be quickly and easily removed from and installed on the L-shaped rod 126 without complicated tools or procedures, greatly simplifying maintenance and replacement processes. Different specifications of suction cups can be quickly replaced according to different packaging materials or sizes, improving the flexibility and adaptability of the equipment.

[0039] The first semi-conical block 1251 and the second semi-conical block 1261 have the same specifications and can form a complete cone. The diameter of the circular opening of the conical groove 1242 is smaller than the diameter of the complete cone formed by the first semi-conical block 1251 and the second semi-conical block 1261. Because the diameter of the circular opening of the conical groove 1242 is smaller than the diameter of the complete cone, this design achieves an interference fit, ensuring a tight connection when the first and second semi-conical blocks are inserted into the conical groove 1242. The interference fit allows the conical groove to apply greater pressure to the first and second semi-conical blocks when the limiting pin 124 is tightened, enhancing the locking effect and preventing the parts from loosening or falling off. The smaller circular opening forces the first and second semi-conical blocks to be precisely aligned during insertion, reducing positional deviations during installation and ensuring highly consistent positioning every time the bag opening is changed.

[0040] The implementation method of Example 2 is as follows:

[0041] The difference between Embodiment 2 and Embodiment 1 lies in the specifications of the first semi-conical block 1251 and the second semi-conical block 1261. The diameter of the circular opening of the conical groove 1242 is equal to the diameter of the complete cone formed by the first semi-conical block 1251 and the second semi-conical block 1261. This equal diameter ensures that the first and second semi-conical blocks can be accurately embedded in the conical groove 1242, reducing potential positional deviations during installation. The equal diameter of the circular opening also ensures maximum contact area between the first and second semi-conical blocks and the conical groove 1242, resulting in more uniform pressure distribution and enhanced connection stability. Furthermore, the equal diameter of the circular opening of the conical groove 1242 reduces hard contact and friction between components, lowers the wear rate, and thus extends the service life of the bag-opening mechanism.

[0042] Specifically, the working principle of this invention is as follows:

[0043] A negative pressure air source connector 125 is provided inside the slider 121. A first semi-conical block 1251 is provided on its side wall, and one end of it connects to a hollow L-shaped rod 126. A second semi-conical block 1261 is installed on the side wall of the L-shaped rod 126. When it is necessary to fix or replace the bag opening head, the extent to which the limiting pin 124 with a handle 1241 extends into the slider 121 is adjusted by rotating it. One end of the limiting pin 124 has a conical groove 1242, the diameter of which is smaller than the diameter of the complete cone formed by the first and second semi-conical blocks, thus achieving an interference fit. This design ensures that when the limiting pin 124 is tightened, the conical groove applies uniform pressure to the first and second semi-conical blocks, making them fit tightly, enhancing the locking effect, and preventing parts from loosening or falling off.

[0044] A limiting groove 122 is formed at the top of the slider 121, the width of which is consistent with the diameter of the second semi-conical block 1261, ensuring a precise fit between the two. This design allows the second semi-conical block 1261 to be accurately embedded in the limiting groove 122, avoiding positional deviation, reducing possible lateral offset during installation, and improving the overall positioning accuracy of the system. Furthermore, the slider 121 has a retaining groove 123, within which the crossbar 11 is fitted, forming a sliding connection that allows the slider 121 to slide freely along the crossbar 11. The shape of the retaining groove 123 perfectly matches the rectangular cross-section of the crossbar 11, ensuring accurate positioning of the slider 121 during installation, preventing lateral offset or rotation, and enhancing the stability and working accuracy of the entire device.

[0045] A rubber sealing ring 1252 is provided at the end of the negative pressure air source connector 125 that mates with the L-shaped rod 126. The rubber sealing ring effectively fills the tiny gap between the two, ensuring a complete seal when connected, preventing negative pressure leakage. At the same time, it acts as a buffer layer, reducing direct contact and friction between metal parts, and extending service life. A suction cup 127 is installed at one end of the L-shaped rod 126. The suction cup has a retaining ring, and a groove is provided at one end of the L-shaped rod 126 to engage with the retaining ring, allowing the suction cup to be quickly and easily disassembled and installed without complicated tools or procedures.

[0046] In summary, this invention solves the problem of the bag opening head being difficult to replace in existing packaging machines.

[0047] It should be understood that the terms "first," "second," etc., are used in this utility model to describe various information, but this information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this utility model, "first" information can also be referred to as "second" information, and similarly, "second" information can also be referred to as "first" information. In addition, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0048] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications are also considered to be within the protection scope of this utility model.

Claims

1. A bag-opening device for a packaging machine with a quick-change bag-opening head, comprising a bag-opening mechanism (1), characterized in that, The bag opening mechanism (1) includes a crossbar (11), on which at least one bag opening head mechanism (12) is installed. The bag opening head mechanism (12) includes a slider (121), in which a negative pressure air source connector (125) is provided. A first semi-conical block (1251) is provided on the side wall of the negative pressure air source connector (125). An L-shaped rod (126) is provided at one end of the negative pressure air source connector (125). A second semi-conical block (1261) is installed on the side wall of the L-shaped rod (126). A limiting pin (124) is sleeved on the side wall of the slider (121). The limiting pin (124) is threadedly connected to the slider (121). A conical groove (1242) is opened at one end of the limiting pin (124).

2. The bag opening device for a packaging machine with a quick-change bag opening head according to claim 1, characterized in that, The top of the slider (121) has a limiting groove (122), the width of which is the same as the diameter of the second semi-conical block (1261), and the second semi-conical block (1261) is slidably connected to the limiting groove (122).

3. The bag opening device for a packaging machine with a quick-change bag opening head according to claim 1, characterized in that, The slider (121) has a slot (123), the crossbar (11) is sleeved in the slot (123), the crossbar (11) is slidably connected to the slot (123), and a threaded hole (128) is provided on one side of the slider (121).

4. The bag opening device for a packaging machine with a quick-change bag opening head according to claim 3, characterized in that, The shape of the slot (123) matches the shape of the cross section of the cross bar (11), which is rectangular.

5. A bag-opening device for a packaging machine with a quick-change bag-opening head according to claim 1, characterized in that, A rubber sealing ring (1252) is provided at the end of the negative pressure air source connector (125) that is connected to the L-shaped rod (126).

6. The bag opening device for a packaging machine with a quick-change bag opening head according to claim 1, characterized in that, A handle (1241) is installed at one end of the limiting pin (124).

7. A bag-opening device for a packaging machine with a quick-change bag-opening head according to claim 1, characterized in that, A suction cup (127) is installed at one end of the L-shaped rod (126), a retaining ring is provided inside the suction cup (127), and a retaining groove is provided at one end of the L-shaped rod (126) to engage with the retaining ring.

8. A bag-opening device for a packaging machine with a quick-change bag-opening head according to claim 1, characterized in that, The first semi-conical block (1251) and the second semi-conical block (1261) have the same specifications. The first semi-conical block (1251) and the second semi-conical block (1261) can form a complete cone. The diameter of the circular opening of the conical groove (1242) is equal to or less than the diameter of the complete cone formed by the first semi-conical block (1251) and the second semi-conical block (1261).

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