Packaging machine capable of automatically adjusting tension degree

Abstract

The utility model relates to a packaging machine capable of automatically adjusting the tension degree, and belongs to the field of packaging machines, the packaging machine comprises a rack and an unwinding roller, the unwinding roller is provided with a servo motor, the servo motor is provided with a servo controller, and the servo controller controls the servo motor to drive the unwinding roller to rotate; a sliding rail is arranged at the position, corresponding to the movable roller, of the rack, a sliding plate is arranged at one end of the movable roller, and a sliding groove is formed in the position, corresponding to the sliding rail, of the sliding plate. The sliding plate is provided with a rack, the rack is meshed with a gear, the gear is coaxially provided with an encoder, the encoder is electrically connected with the servo controller, and the encoder outputs a rotation value to the servo controller; an upper limit value and a lower limit value are preset in the servo controller, the servo controller receives the rotation value, when the rotation value is larger than the upper limit value, the servo controller controls the servo motor to reduce the rotation speed, and when the rotation value is smaller than the lower limit value, the servo controller controls the servo motor to increase the rotation speed. The packaging film tensioning device has the effect of automatically adjusting the tensioning degree of the packaging film in the packaging process.

Description

Technical Field

[0001] The present application relates to the field of packaging machines, and in particular, to a packaging machine with automatic tension adjustment. Background Art

[0002] A packaging machine is an automatic continuous packaging device that can be applied to the packaging of various specifications of food and non-food products.

[0003] The packaging machine includes a frame. A feeding mechanism, a die feeding mechanism, a forming mechanism, a longitudinal sealing and film pulling mechanism, and a transverse sealing and cutting mechanism are sequentially arranged on the frame. The feeding mechanism feeds materials to the position of the forming mechanism through a conveyor belt. After the packaging film enters the position of the bag forming mechanism through the film feeding mechanism, the materials are wrapped in the packaging film to form the packaging film. After the formed packaging film is sealed by the longitudinal sealing device, it forms a cylinder, and the transverse sealing and cutting device seals and cuts the wrapped cylinder film. The die feeding mechanism includes a unwind roll, and a packaging film for packaging is installed on the unwind roll. The unwind roll outputs the packaging film at a constant speed. The packaging film passes through multiple movable rollers for tensioning and then enters the forming mechanism for forming. The tension degree of the packaging film can affect the packaging effect of the packaging machine. When the tension of the packaging film is insufficient, the packaging film will be slack during the packaging process, which may lead to a decline in packaging quality. When the packaging film is overly tensioned, it may cause excessive stretching of the packaging material, making it easy to break or damage, affecting the packaging effect.

[0004] In view of the above related technologies, the rotation speed of the unwind roll of the packaging machines currently on the market is preset before the packaging machine works. However, during the packaging process of the packaging machine, the tension of the packaging film may change due to various external factors, thereby affecting the packaging effect. Utility Model Content

[0005] In order to automatically adjust the tension of the packaging film during the packaging process and ensure the packaging effect, the present application provides a packaging machine with automatic tension adjustment.

[0006] The packaging machine with automatic tension adjustment provided by the present application adopts the following technical solutions:

[0007] A packaging machine with automatic tension adjustment, including a frame;

[0008] An unwind roll around which a packaging film for packaging is wound; one end of the unwind roll is provided with a servo motor, the servo motor is fixedly connected to the frame, the servo motor is provided with a servo controller, and the servo controller controls the servo motor to drive the unwind roll to rotate;

[0009] A tension roll, the tension roll is rotatably connected to the frame, and the tension roll is parallel to the axis of the unwind roll;

[0010] A movable roller, wherein the movable roller is movably connected to the frame, the frame is provided with a vertical dovetail-shaped slide rail at a position corresponding to the movable roller, the movable roller is provided with a sliding plate near one end of the frame, the sliding plate is provided with a slide groove matching the slide rail at a position corresponding to the slide rail, and the slide groove slides vertically along the slide rail;

[0011] A rack is provided on one side of the sliding plate, the rack is meshed with a gear, an encoder is coaxially mounted on the gear close to the frame, the encoder is fixed to the frame, and the encoder is electrically connected to the servo controller, and the encoder outputs a rotation value to the servo controller;

[0012] The servo controller is preset with an upper limit value and a lower limit value. The servo controller receives a rotation value. When the rotation value is greater than the upper limit value, the servo controller controls the servo motor to reduce the rotation speed. When the rotation value is less than the lower limit value, the servo controller controls the servo motor to increase the rotation speed.

[0013] By adopting this technical solution, the packaging machine uses changes in film tension to cause the movable roller to move up and down, which in turn drives the rack via the sliding plate. The rack and gear work together to transmit signals to the servo controller via an encoder, enabling the servo motor to automatically adjust the unwinding roller's speed, thereby ensuring the appropriate film tension during the packaging process and guaranteeing packaging results. The dovetail-shaped slide rail and slide groove ensure a more stable installation of the sliding plate and frame, thereby increasing the stability of the movable roller and improving the reliability of the device.

[0014] Optionally, a mounting plate is provided at one end of the movable roller close to the sliding plate, the mounting plate is located between the movable roller and the sliding plate, and the mounting plate is connected to the sliding plate via bolts.

[0015] By adopting the above technical solution, the mounting plate and the sliding plate are connected by bolts. This connection method facilitates the installation and removal of the movable roller. When the movable roller is worn or needs to be replaced with a different type of movable roller, the movable roller can be easily removed and replaced, thereby improving the maintainability and ease of use of the equipment.

[0016] Optionally, a limit plate is provided on the rack at a position corresponding to the slide rail, the limit plate is horizontally arranged below the sliding plate, and the upper surface of the limit plate is not lower than the lower end surface of the slide rail.

[0017] By adopting this technical solution, the limit plate ensures that the sliding plate does not fall off the slide rail during the sliding process. When the sliding plate moves downward to the limit position, it is blocked by the limit plate, thereby reducing the risk of failure caused by the sliding plate falling off or shaking, and improving the overall performance and reliability of the packaging machine.

[0018] Optionally, the sliding plate can abut against the surface of the limiting plate, and a buffer is provided on the end face where the sliding plate abuts against the limiting plate.

[0019] By adopting the above technical solution, when the sliding plate contacts the limiting plate due to the movement of the movable roller, the buffer can absorb part of the impact energy, reduce the vibration and noise generated by direct collision, and help protect the sliding plate, the limiting plate and other components from damage, thereby extending the service life of the sliding plate, the limiting plate and related parts.

[0020] Optionally, an auxiliary rail is installed at the position of the frame corresponding to the mounting plate. The auxiliary rail is arranged on one side of the slide rail and is parallel to the slide rail; an auxiliary groove is provided at the position of the mounting plate corresponding to the auxiliary rail. The two side walls of the auxiliary groove are respectively in contact with the two side walls of the auxiliary rail, and the mounting plate can move vertically under the cooperation of the auxiliary groove and the auxiliary rail.

[0021] By adopting the above technical solution, the arrangement of the auxiliary rail and the auxiliary groove enhances the stability of the mounting plate and the sliding plate during vertical movement. The auxiliary rail is parallel to the slide rail, providing an additional support and guidance for the mounting plate to ensure that the mounting plate can maintain the correct direction and position during the sliding process.

[0022] Optionally, the bottom of the auxiliary groove is not in contact with the auxiliary rail.

[0023] By adopting the above technical solution, the bottom of the auxiliary groove is not in contact with the auxiliary rail, forming a non-contact gap between the auxiliary rail and the mounting plate, reducing the friction generated by contact, making the mounting plate move more smoothly on the auxiliary rail, improving the efficiency and smoothness of the sliding plate during vertical movement, and helping to ensure the precise adjustment of the tension of the packaging film.

[0024] Optionally, the frame is provided with an upper limiting member and a lower limiting member. The upper limiting member is located at the upper end face position near the slide rail above the movable roller, and the lower limiting member is located at the lower end face position near the slide rail below the movable roller. The upper limiting member and the lower limiting member jointly act to limit the movement range of the movable roller.

[0025] By adopting the above technical solution, the upper limiting member and the lower limiting member limit the maximum and minimum movement positions of the movable roller, further ensuring that the movable roller will not exceed the safe range when adjusting the tension of the packaging film, and further improving the stability of the packaging machine.

[0026] Optionally, adjusting bolts are threadedly connected to the mutually close sides of the upper limiting member and the lower limiting member. By adjusting the adjusting bolts, the movement range of the movable roller can be adjusted.

[0027] By adopting the above technical solution, by rotating the adjusting bolt, the relative positions between the upper limit member, the lower limit member and the movable roller can be conveniently changed, so as to accurately control the maximum and minimum movement ranges of the movable roller. This adjustment method is simple and intuitive, and the operation is convenient, enabling users to quickly adjust the movement range of the movable roller according to actual needs.

[0028] Optionally, a plurality of counterweight blocks are arranged at a position of the movable roller away from the frame, a counterweight groove is formed at a position of the movable roller corresponding to each counterweight block, and the counterweight block is detachably connected to the movable roller in the counterweight groove.

[0029] By adopting the above technical solution, since different materials and sizes of packaging films require different tension forces during packaging, by adjusting the counterweight blocks, the weight of the movable roller can be changed, and further the tension degree of the packaging film during the packaging process can be changed. Users can flexibly adjust the weight of the movable roller to adapt to different packaging requirements. The detachable connection design of the counterweight blocks enables users to adjust the weight of the movable roller according to actual needs.

[0030] In summary, the present application includes at least one of the following beneficial technical effects:

[0031] 1. The packaging machine realizes the automatic adjustment of the rotation speed of the unwinding roller by the servo motor through the up and down movement of the movable roller caused by the change of the tension degree of the packaging film, and then drives the rack to move through the sliding plate. The rack and the gear cooperate to transmit signals to the servo controller through the encoder, so as to ensure the appropriate tension degree of the packaging film during the packaging process and guarantee the packaging effect;

[0032] 2. The limiting plate can ensure that the sliding plate will not fall off the slide rail during the sliding process. When the sliding plate moves downward to the limit position, it will be blocked by the limiting plate, thereby reducing the risk of failures caused by the falling off or shaking of the sliding plate, and improving the overall performance and reliability of the packaging machine;

[0033] 3. The buffer member can absorb part of the impact energy when the sliding plate collides with the limiting plate, reduce the vibration and noise generated by direct collision, help protect the sliding plate, the limiting plate and other components from damage, and further extend the service lives of the sliding plate, the limiting plate and related parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a schematic structural diagram of Embodiment 1 of the present application.

[0035] Figure 2 is a schematic structural diagram of Embodiment 1 of the present application highlighting the servo motor and the encoder.

[0036] Figure 3 is a partial schematic diagram of Embodiment 1 of the present application highlighting the slide rail and the limiting plate.

[0037] Figure 4 It is a partial schematic diagram highlighting the sliding groove and the counterweight groove in Embodiment 1 of the present application.

[0038] Figure 5 It is a partial schematic diagram highlighting the counterweight block in Embodiment 2 of the present application.

[0039] Explanation of reference numerals: 1, frame; 11, slide rail; 12, limit plate; 13, auxiliary rail; 2, unwind roller; 21, servo motor; 22, servo controller; 3, tension roller; 4, movable roller; 41, counterweight groove; 42, counterweight block; 5, sliding plate; 51, sliding groove; 52, buffer member; 6, mounting plate; 61, rack; 62, auxiliary groove; 7, encoder; 71, gear; 8, upper limit member; 81, lower limit member; 82, adjusting bolt; 83, rubber pad. Detailed implementation manners

[0040] The following further elaborates on the present application in conjunction with the attached Figures 1-5 drawings.

[0041] In the present application, unless otherwise clearly defined and limited, terms such as "installed", "connected", "connected to", "fixed" and the like shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection, or a communication connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In the present application, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0043] Embodiment 1. An automatic tension-adjusting packaging machine is disclosed in an embodiment of the present application. Refer to Figure 1 and Figure 2, An automatic tension-adjusting packaging machine includes a frame 1. The frame 1 is rotatably connected to a unwind roller 2, and a packaging film for packaging is wound around the unwind roller 2. One end of the unwind roller 2 is equipped with a servo motor 21, and the servo motor 21 is fixedly connected to the frame 1 on the side of the frame 1 away from the unwind roller 2. The servo motor 21 is connected to a servo controller 22, and the servo controller 22 controls the servo motor 21 to drive the unwind roller 2 to rotate. The frame 1 is also rotatably connected to a plurality of tension rollers 3. The plurality of tension rollers 3 are parallel to the axis of the unwind roller 2, and the film on the unwind roller 2 can be tensioned and redirected through the plurality of tension rollers 3.

[0044] Referring to Figure 1 and Figure 3 , the frame 1 is provided with two movable rollers 4, and the two movable rollers 4 are movably connected to the frame 1. A sliding plate 5 is provided on the side of the frame 1 close to the movable rollers 4. An installation plate 6 is provided on the side of the sliding plate 5 away from the frame 1. The side of the installation plate 6 away from the sliding plate 5 is rotatably connected to the two movable rollers 4, and the installation plate 6 is located between the movable rollers 4 and the sliding plate 5. A vertical dovetail-shaped slide rail 11 is provided at the position of the frame 1 corresponding to the sliding plate 5, and a chute 51 matching the slide rail 11 is provided at the position of the sliding plate 5 corresponding to the slide rail 11. The installation plate 6 is connected to the sliding plate 5 by bolts, and the two movable rollers 4 are horizontally connected to the installation plate 6 at the same height and are located on both sides of the slide rail 11. When the two movable rollers 4 move vertically, the movable rollers 4 drive the installation plate 6 and the sliding plate 5 to make the chute 51 slide vertically along the slide rail 11.

[0045] Referring to Figure 1 , a rack 61 is provided on one side of the installation plate 6. The rack 61 meshes with a gear 71. An encoder 7 is coaxially installed on the side of the gear 71 close to the frame 1. The encoder 7 is fixedly connected to the frame 1 on the side of the frame 1 away from the gear 71, and the encoder 7 is electrically connected to the servo controller 22. The encoder 7 outputs a rotation value to the servo controller 22; the servo controller 22 presets an upper limit value and a lower limit value. The servo controller 22 receives the rotation value. When the rotation value is greater than the upper limit value, the servo controller 22 controls the servo motor 21 to reduce the speed. When the rotation value is less than the lower limit value, the servo controller 22 controls the servo motor 21 to increase the speed.

[0046] When the tension of the packaging film is within the normal range, the rotation value output by the encoder 7 is between the upper limit value and the lower limit value; when the packaging film is insufficiently tensioned, the gravity of the movable roller 4 is greater than the tension of the packaging film, and the movable roller 4 drives the mounting plate 6 to move downward, the gear 71 rotates, and the rotation value output by the encoder 7 increases. When the rotation value is greater than the upper limit value, the servo controller 22 controls the servo motor 21 to reduce the speed; when the packaging film is overly tensioned, the gravity of the movable roller 4 is less than the tension of the packaging film, and the movable roller 4 drives the mounting plate 6 to move upward, the gear 71 rotates reversely, and the rotation value output by the encoder 7 decreases. When the rotation value is less than the lower limit value, the servo controller 22 controls the servo motor 21 to increase the speed. The packaging machine causes the up and down movement of the movable roller 4 due to the change in the tension of the packaging film, and then drives the rack 61 to move through the sliding plate 5. The rack 61 and the gear 71 cooperate to transmit signals to the servo controller 22 through the encoder 7, realizing the automatic adjustment of the rotation speed of the unwinding roller 2 by the servo motor 21, thereby ensuring the appropriate tension of the packaging film during the packaging process and guaranteeing the packaging effect.

[0047] Refer to Figure 1 , a limit plate 12 is provided at the position of the frame 1 corresponding to the slide rail 11. The limit plate 12 is horizontally arranged below the sliding plate 5, and the upper surface of the limit plate 12 is not lower than the lower end surface of the slide rail 11. In this embodiment, the upper surface of the limit plate 12 is flush with the lower end surface of the slide rail 11. When the sliding plate 5 moves downward, it can abut against the surface of the limit plate 12. A buffer member 52 is provided on the end surface of the sliding plate 5 that abuts against the limit plate 12. The buffer member 52 can absorb part of the impact energy when the sliding plate 5 collides with the limit plate 12, reducing the vibration and noise generated by direct collision, and helping to protect the sliding plate 5, the limit plate 12 and other components from damage.

[0048] Refer to Figure 3 , an auxiliary rail 13 is fixedly connected to the frame 1 at the position corresponding to the mounting plate 6. The auxiliary rail 13 is arranged parallel to the slide rail 11 on the side away from the rack 61 of the slide rail 11; an auxiliary groove 62 is provided in the mounting plate 6 at the position corresponding to the auxiliary rail 13. The two side walls of the auxiliary groove 62 are respectively in contact with the two side walls of the auxiliary rail 13, and the bottom of the auxiliary groove 62 is not in contact with the auxiliary rail 13. The mounting plate 6 can move vertically under the cooperation of the auxiliary groove 62 and the auxiliary rail 13.

[0049] Refer to Figure 3 and Figure 4The provision of the auxiliary rail 13 and the auxiliary groove 62 enhances the stability of the mounting plate 6 and the sliding plate 5 during vertical movement, provides additional support and guidance for the mounting plate 6, and reduces the possibility of the mounting plate 6 shifting due to the different positions of the two movable rollers 4 during the sliding process. A non-contact gap is formed between the auxiliary rail 13 and the mounting plate 6, reducing the friction caused by contact and making the mounting plate 6 move more smoothly on the auxiliary rail 13.

[0050] Reference Figure 3 The frame 1 is provided with an upper limit member 8 and a lower limit member 81. The upper limit member 8 is located above the auxiliary rail 13, and the lower limit member 81 is located below the auxiliary rail 13. Adjustment bolts 82 are threadedly connected to the sides of the upper and lower limit members 8 and 81 that are close to each other. The two adjustment bolts 82 are arranged opposite each other, and a rubber pad 83 is fixed to the ends of the two adjustment bolts 82 that are close to each other. A clearance portion is formed on the mounting plate 6 at the position corresponding to the lower limit member 81. The adjustment bolt 82 connected to the lower limit member 81 can abut against the clearance portion, thereby limiting the further downward movement of the movable roller 4. The adjustment bolt 82 connected to the upper limit member 8 can abut against the top of the mounting plate 6, thereby limiting the further upward movement of the movable roller 4.

[0051] The upper and lower limiters 8 and 81 work together to limit the range of movement of the movable roller 4. Adjusting the adjustment bolt 82 allows for precise control of the range of movement of the movable roller 4. The rubber pad 83 connected to the adjustment bolt 82 also provides a certain cushioning effect. When the movable roller 4 moves to its limit position, the rubber pad 83 absorbs some of the impact energy, reducing vibration caused by direct collision. When the adjustment bolt 82 connected to the lower limiter 81 is adjusted to the position where the adjustment bolt 82 contacts the movable roller 4 when the sliding plate 5 contacts the limiter plate 12, the lower limiter 81 can partially absorb the impact force exerted on the limiter plate 12, making the movable roller 4 more stable during sliding.

[0052] The implementation principle of the packaging machine with automatically adjustable tension in Embodiment 1 of this application is as follows: During the packaging process of the packaging machine, the tension of the packaging film on the movable roller 4 and the weight of the movable roller 4 determine the height of the movable roller 4. When the tension of the packaging film is within the normal range, the rotation value output by the encoder 7 fluctuates between the upper limit value and the lower limit value, and the servo controller 22 controls the servo motor 21 to continuously operate at a set speed; when the packaging film is insufficiently tensioned, the gravity of the movable roller 4 is greater than the tension of the packaging film it receives, the movable roller 4 drives the mounting plate 6 to move downward, the gear 71 rotates, and the rotation value output by the encoder 7 increases. When the rotation value is greater than the upper limit value, the servo controller 22 controls the servo motor 21 to reduce the speed; when the packaging film is overly tensioned, the gravity of the movable roller 4 is less than the tension of the packaging film it receives, the movable roller 4 drives the mounting plate 6 to move upward, the gear 71 rotates reversely, and the rotation value output by the encoder 7 decreases. When the rotation value is less than the lower limit value, the servo controller 22 controls the servo motor 21 to increase the speed, realizing the automatic adjustment of the rotation speed of the unwinding roller 2 by the servo motor 21, thereby ensuring the appropriate tension of the packaging film during the packaging process and guaranteeing the packaging effect. The limiting plate 12 can prevent the movable roller 4 from accidentally slipping during the movement. During the up and down movement of the movable roller 4, the upper limiting member 8 and the lower limiting member 81 can limit the movement range of the movable roller 4. At the same time, the lower limiting member 81 can share part of the impact force received by the limiting plate 12, making the movable roller 4 more stable.

[0053] Embodiment 2 is different from Embodiment 1 in that, referring to Figure 5 , a plurality of detachable counterweight blocks 42 are threadedly connected to the movable roller 4. Since different materials and sizes of packaging films require different tension forces during packaging, by adjusting the counterweight blocks 42, the weight of the movable roller 4 can be changed, and thus the tension of the packaging film during the packaging process can be changed. The user can flexibly adjust the weight of the movable roller 4 to adapt to different packaging requirements. Adjusting the weight of the movable roller 4 through the counterweight blocks 42 enables the operator to adjust the tension without frequently changing the preset value of the servo controller 22.

[0054] Furthermore, referring to Figure 5 , counterweight grooves 41 are provided at the positions of the movable roller 4 corresponding to each of the counterweight blocks 42. The counterweight grooves 41 are located at the position of the movable roller 4 away from the machine frame 1. The counterweight blocks 42 are connected to the movable roller 4 within the counterweight grooves 41, and the size of the counterweight blocks 42 is smaller than the size of the counterweight grooves 41. When the counterweight blocks 42 are made of the same material as the movable roller 4 and the number of the counterweight blocks 42 is less than the number of the counterweight grooves 41 or the density of the counterweight blocks 42 is less than the density of the movable roller 4, the center of gravity of the movable roller 4 is closer to the machine frame 1, the force arm is shorter, the generated torque is smaller, and the stability of the movable roller 4 is better.

[0055] The embodiments of the present application have the effect of automatically adjusting the tension of the packaging film during the packaging process.

[0056] The above are all the preferred embodiments of the present application, and do not limit the protection scope of the present application accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. An automatic tension-adjusting packaging machine, characterized in that, Including: A frame (1); An unwinding roller (2) around which a packaging film for packaging is wound; one end of the unwinding roller (2) is provided with a servo motor (21), the servo motor (21) is fixedly connected to the frame (1), the servo motor (21) is provided with a servo controller (22), and the servo controller (22) controls the servo motor (21) to drive the unwinding roller (2) to rotate; A tensioning roller (3) rotatably connected to the frame (1), and the tensioning roller (3) is parallel to the axis of the unwinding roller (2); A movable roller (4) movably connected to the frame (1), a vertical dovetail-shaped slide rail (11) is provided at the position of the frame (1) corresponding to the movable roller (4), a sliding plate (5) is provided at one end of the movable roller (4) close to the frame (1), and a chute (51) matching the slide rail (11) is provided at the position of the sliding plate (5) corresponding to the slide rail (11), and the chute (51) slides vertically along the slide rail (11); A rack (61) is provided on one side of the sliding plate (5), the rack (61) meshes with a gear (71), an encoder (7) is coaxially installed on the side of the gear (71) close to the frame (1), the encoder (7) is fixedly connected to the frame (1), and the encoder (7) is electrically connected to the servo controller (22), and the encoder (7) outputs a rotation value to the servo controller (22); The servo controller (22) presets an upper limit value and a lower limit value, the upper limit value is greater than the lower limit value, the servo controller (22) receives the rotation value, when the rotation value is greater than the upper limit value, the servo controller (22) controls the servo motor (21) to reduce the speed, and when the rotation value is less than the lower limit value, the servo controller (22) controls the servo motor (21) to increase the speed.

2. The packaging machine for automatically adjusting the tension according to claim 1, wherein: An installation plate (6) is provided at one end of the movable roller (4) close to the sliding plate (5), the installation plate (6) is located between the movable roller (4) and the sliding plate (5), and the installation plate (6) is bolted to the sliding plate (5).

3. The packaging machine with automatically adjustable tension according to claim 1, characterized in that: A limiting plate (12) is provided at the position of the frame (1) corresponding to the slide rail (11), the limiting plate (12) is horizontally arranged below the sliding plate (5), and the upper surface of the limiting plate (12) is not lower than the lower end surface of the slide rail (11).

4. An automatic tension-adjusting packaging machine according to claim 3, wherein: The sliding plate (5) can abut against the surface of the limiting plate (12), and a buffer member (52) is provided on the end surface of the sliding plate (5) abutting against the limiting plate (12).

5. An automatic tension-adjusting packaging machine according to claim 2, characterized in that: An auxiliary rail (13) is installed at a position of the frame (1) corresponding to the mounting plate (6). The auxiliary rail (13) is arranged on one side of the slide rail (11) and is parallel to the slide rail (11); an auxiliary groove (62) is formed at a position of the mounting plate (6) corresponding to the auxiliary rail (13). Two side walls of the auxiliary groove (62) are respectively abutted against two side walls of the auxiliary rail (13), and the mounting plate (6) can move vertically under the cooperation of the auxiliary groove (62) and the auxiliary rail (13).

6. The packaging machine for automatically adjusting the tension according to claim 5, wherein: The bottom of the auxiliary groove (62) is not in contact with the auxiliary rail (13).

7. An automatic tension-adjusting packaging machine according to claim 1, wherein: The frame (1) is provided with an upper limit member (8) and a lower limit member (81). The upper limit member (8) is located above the movable roller (4) and close to the upper end face position of the slide rail (11), and the lower limit member (81) is located below the movable roller (4) and close to the lower end face position of the slide rail (11). The upper limit member (8) and the lower limit member (81) act together to limit the movement range of the movable roller (4).

8. An automatic tension-adjusting packaging machine according to claim 7, characterized in that: Adjusting bolts (82) are threadedly connected to one side of the upper limit member (8) and the lower limit member (81) close to each other. By adjusting the adjusting bolts (82), the movement range of the movable roller (4) can be adjusted.

9. An automatic tension-adjusting packaging machine according to claim 1, characterized in that: A plurality of counterweight blocks (42) are arranged at a position of the movable roller (4) far from the frame (1). Counterweight grooves (41) are formed at positions of the movable roller (4) corresponding to each counterweight block (42). The counterweight blocks (42) are detachably connected to the movable roller (4) in the counterweight grooves (41).

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