Lifting mechanism for continuous drawing vacuum packaging machine

Abstract

The invention provides a lifting mechanism for a continuous drawing vacuum packaging machine, and relates to the technical field of continuous drawing vacuum packaging machines. The lifting mechanism for the continuous drawing vacuum packaging machine comprises a fixing frame, an upper frame, a controller and two assembling machine wallboards. According to the invention, a worm gear and worm meshing transmission matching guide column precise sliding structure is adopted, the lifting precision is ensured, the action stroke of a driving part is obviously shortened, the mechanical dead point clamping stagnation risk is effectively eliminated, and the right-angle transmission layout of the worm and the worm gear is adopted, so that the transverse space occupation of the mechanical structure is small, and the large-stroke lifting action can be met; an electromagnetic clutch is arranged between a servo motor and a worm, a hand wheel is arranged at the other end of the worm, the hand wheel can be started for adjustment by cutting off power supply of the electromagnetic clutch when needed, a protection box with an electronic lock and a box cover are arranged outside the hand wheel, and a controller is matched to control the states of the electronic lock and the electromagnetic clutch to be mutually exclusive. And a good safety protection effect is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of continuous stretching vacuum packaging machines, and particularly to a lifting mechanism for a continuous stretching vacuum packaging machine. Background Art

[0002] The die lifting system of a continuous stretching vacuum packaging machine is a mechanical device for controlling the lifting of the die of the packaging machine. The lifting systems of the prior art drive the overall upper frame and lower frame to perform lifting movements by a lifting cylinder, thereby driving the two dies and the lower cutting knife installed on the upper frame to move up and down. Usually, a single cylinder directly drives the die to lift. This type of lifting method has a simple structure, but when the cylinder operates, it generates inertial force, produces a large amount of noise, and there is no self-locking after the cylinder extends, resulting in a retraction phenomenon under pressure.

[0003] For this reason, the prior art has proposed improvement solutions. For example, a lifting mechanism for a continuous stretching vacuum packaging machine is provided with a rotating arm and a swing arm on a first rotating shaft and a second rotating shaft respectively. Bearing seats are provided at both ends of the first rotating shaft and the second rotating shaft, and the bearing seats at the same end are connected by a connecting plate. A column is provided on the bearing seat, and a cross arm is installed at the upper end of the column; a cylinder fixing shaft is provided on the connecting plate, one end of the cylinder fixing shaft is connected to a cylinder, and the piston end of the cylinder is linked with the swing arm on the second rotating shaft through a piston joint; the swing arm on the second rotating shaft is linked with the swing arm on the first rotating shaft through a connecting rod. The moving beam is linked with the rotating arm through a double connecting plate and is connected to a sliding bearing seat sleeved on the column, and the moving beam is also connected through an upper connecting plate. This technology claims to have the advantages of low air consumption, small mold closing impact, and high production efficiency.

[0004] Another technology discloses an independent self-locking lifting device for a die of a continuous stretching vacuum packaging machine, including a wall panel, a guide groove, a guide block, and an upper frame. Two pairs of large bearing seats are installed on the wall panel, each pair of large bearing seats is provided with a large support shaft, and the large support shaft fixes a pair of rocker arms; the upper ends of the rocker arms are installed with lifting rollers through a connecting shaft, and a lower frame is arranged between the connecting shafts to form a parallelogram swing truss. An upper frame pulling block with a lower pulling roller is installed on the upper frame (the lower pulling roller abuts against the bottom surface of the lower frame), and a driving device is arranged on one of the pairs of rocker arms. This technology has the same principle as the aforementioned technology, and both drive the upper frame to lift by driving the rocker arms with a cylinder.

[0005] After analysis, the above-mentioned lifting structure driven by a cylinder has defects such as short stroke and easy occurrence of motion dead points. And the above-mentioned cylinder driving technologies cannot be quickly switched to the manual height adjustment mode, which is not conducive to machine adjustment and testing. In view of the above technical problems, it is urgent to further optimize the lifting mechanism of the continuous stretching vacuum packaging machine. Summary of the Invention

[0006] In view of the deficiencies of the prior art, the present invention provides a lifting mechanism for a continuous stretching vacuum packaging machine, which solves the problems of short stroke, easy occurrence of motion dead points, and inability to adapt to manual adjustment existing in the lifting mechanism for a continuous stretching vacuum packaging machine in the prior art.

[0007] To achieve the above objectives, the present invention is realized through the following technical solutions: A lifting mechanism for a continuous stretching vacuum packaging machine includes a fixed frame, an upper frame, a controller, and two sets of installation wallboards. The two sets of installation wallboards are respectively fixedly connected to the lower wall of the fixed frame through two sets of diagonal braces. The upper frame is slidably connected to the upper wall of the fixed frame through a guiding structure. A rotating seat is fixedly connected to the lower wall of the fixed frame. A threaded seat is rotatably connected to the inner side wall of the rotating seat. A worm gear is fixedly connected to the lower end of the threaded seat. A screw rod is threadedly connected to the inner side wall of the threaded seat. The upper and lower ends of the screw rod respectively penetrate through the upper and lower ends of the threaded seat, and the upper end of the screw rod is rotatably connected to the lower wall of the upper frame. On the lower wall of the fixed frame and on the left and right sides of the rotating seat, a first support and a second support are respectively fixedly connected. A first rotating shaft is rotatably connected to the inner side wall of the first support. A second rotating shaft is rotatably connected to the inner side wall of the second support. A worm is fixedly connected between the opposite ends of the first rotating shaft and the second rotating shaft. The axis of the worm and the axis of the worm gear are perpendicular in the front view projection. The worm and the outer wall of the worm gear are continuously enveloped and meshed with each other. A fourth support is fixedly connected to the lower wall of the fixed frame and on the left side of the first support. A servo motor is fixedly connected to the left wall of the fourth support. The output shaft of the servo motor penetrates through the inner wall of the fourth support and extends to the right side of the fourth support. The end of the output shaft of the servo motor is connected to the first rotating shaft through an electromagnetic clutch. The electromagnetic clutch is powered by a conductive slip ring. A handwheel is provided at the end of the second rotating shaft away from the worm for facilitating manual rotation of the worm.

[0008] Preferably, a third support is fixedly connected to the lower wall of the fixed frame and on the right side of the second support. A sliding sleeve is slidably connected to the inner side wall of the third support. The handwheel is fixedly connected to the end of the sliding sleeve away from the second rotating shaft. A magnetic adsorption structure for adsorption and fixation is provided between the sliding sleeve and the second rotating shaft. A protective box is fixedly connected to the lower wall of the fixed frame and near the right wall position. The third support and the sliding sleeve are both arranged inside the protective box. The right wall of the protective box is rotatably connected to a box cover through a hinge. The box cover and the protective box are locked through an electronic lock. A hanging bracket is fixedly connected to the lower wall of the fixed frame and near the left wall position. A heat dissipation structure for actively dissipating heat from the servo motor and the electromagnetic clutch is provided on the lower wall of the hanging bracket. A temperature detection structure for detecting the temperature rise of the servo motor and the electromagnetic clutch is provided on the lower wall of the fixed frame. A distance detection structure for detecting the distance between the upper frame and the fixed frame is provided on the upper wall of the fixed frame.

[0009] Preferably, the guiding structure includes four groups of guiding columns and guiding seats. The four groups of guiding columns are all fixedly connected to the lower wall of the upper frame and are respectively close to the four corners of the lower wall of the upper frame. The four groups of guiding seats are all fixedly connected to the upper wall of the fixed frame and are respectively aligned with a group of guiding columns up and down. The end of the guiding column away from the upper frame sequentially penetrates the inner wall of the guiding seat and the inner wall of the fixed frame. A polytetrafluoroethylene sleeve is arranged on the inner side wall of the guiding seat. The guiding column penetrates the inner side wall of the polytetrafluoroethylene sleeve and is slidably connected thereto.

[0010] Preferably, the magnetic attraction structure includes a first permanent magnet ring and a second permanent magnet ring. A retaining ring is fixedly connected to the outer wall of the end of the second rotating shaft away from the worm. The first permanent magnet ring is fixedly connected to the right wall of the retaining ring. The second permanent magnet ring is fixedly connected to the end of the sliding sleeve facing the second rotating shaft. The opposite sides of the first permanent magnet ring and the second permanent magnet ring have opposite magnetic polarities. The sliding sleeve and the second rotating shaft are fixedly adsorbed to each other through the first permanent magnet ring and the second permanent magnet ring.

[0011] Preferably, a square rod is fixedly connected to the end of the second rotating shaft away from the worm. The end of the square rod away from the second rotating shaft penetrates the inner side wall of the sliding sleeve and is slidably connected to the sliding sleeve. The cross section of the square rod is square. The shape of the inner side wall of the sliding sleeve matches the outer shape of the square rod. The square rod is coated with a vulcanized bonded damping rubber layer. The outer wall of the damping rubber layer is slidably connected to the inner side wall of the sliding sleeve.

[0012] Preferably, both the electronic lock and the electromagnetic clutch are controlled by a controller. When the electronic lock is opened, the controller forcibly cuts off the power supply of the electromagnetic clutch.

[0013] Preferably, the heat dissipation structure includes two groups of heat dissipation fans. Two openings are sequentially arranged on the lower wall of the hanging frame in a left-right distribution. A filter net is clamped on the inner side wall of each opening. The two groups of heat dissipation fans are respectively fixedly connected to the upper wall of a group of filter nets. The two groups of heat dissipation fans are respectively corresponding to the servo motor and the electromagnetic clutch up and down.

[0014] Preferably, the two groups of heat dissipation fans are both magnetic levitation fans.

[0015] Preferably, the temperature detection structure includes two groups of temperature sensors. A group of connecting brackets are respectively fixedly connected to the lower wall of the fixed frame and on the left and right sides of the fourth support. The two groups of temperature sensors are respectively fixedly connected to the ends of a group of connecting brackets away from the fixed frame. The probes of the two groups of temperature sensors are respectively aligned with the top surface of the heat dissipation shell of the servo motor and the top surface of the electromagnetic clutch housing. The two groups of temperature sensors are both non-contact temperature measurement sensors.

[0016] Preferably, the distance detection structure includes two groups of distance sensors. The two groups of distance sensors are both fixedly connected to the upper wall of the fixed frame and are respectively close to the left wall and the right wall of the fixed frame. The detection ends of the two groups of distance sensors both face the lower wall of the upper frame.

[0017] The present invention provides a lifting mechanism for a continuous stretching vacuum packaging machine. It has the following beneficial effects: Compared with the prior art, the lifting mechanism for the continuous stretching vacuum packaging machine adopts a worm and worm gear meshing drive in cooperation with a precision sliding structure of a guide post. While ensuring the lifting precision, it significantly shortens the action stroke of the driving component, effectively eliminates the risk of mechanical dead point jamming, and has less lateral space occupation of the mechanical structure through the right-angle drive layout of the worm and the worm gear. Selecting a screw with an appropriate length can meet the lifting action with a large stroke.

[0018] Compared with the prior art, for the lifting mechanism of the continuous stretching vacuum packaging machine, an electromagnetic clutch is arranged between the servo motor and the worm, and a handwheel is arranged at the other end of the worm. It can be adjusted by enabling the handwheel by cutting off the power supply of the electromagnetic clutch when needed, and can quickly switch between mechanical actions and manual adjustments.

[0019] Compared with the prior art, for the lifting mechanism of the continuous stretching vacuum packaging machine, a protective box and a box cover with an electronic lock are arranged outside the handwheel, and the controller is coordinated to control the mutual exclusion of the states of the electronic lock and the electromagnetic clutch, playing a good safety protection role. Description of the Drawings

[0020] Figure 1 It is a schematic structural diagram of the present invention; Figure 2 For the present invention Figure 1 A partial enlarged view at A in the figure; Figure 3 It is a partial cross-sectional view of the connection structure of the fixed frame, screw, worm gear and worm of the present invention; Figure 4 It is a partial cross-sectional view of the connection structure of the fixed frame, sliding sleeve, second rotating shaft and protective box of the present invention; Figure 5 It is a partial cross-sectional view of the connection structure of the second rotating shaft and the sliding sleeve of the present invention; Figure 6 It is a schematic diagram of the end face structure of the square rod of the present invention; Figure 7 It is a partial cross-sectional view of the connection structure of the fixed frame, hanging frame, servo motor and electromagnetic clutch of the present invention; Figure 8 It is a side view of the hanging frame of the present invention.

[0021] Among them, 1. Fixed frame; 2. Machine-installed wall panel; 3. Diagonal brace; 4. Guide seat; 5. Guide post; 6. Upper frame; 7. Screw rod; 8. Distance sensor; 9. Protection box; 10. Box cover; 11. Electronic lock; 12. Rotating seat; 13. Threaded seat; 14. Worm gear; 15. First support; 16. First rotating shaft; 17. Second support; 18. Second rotating shaft; 19. Worm; 20. Retaining ring; 21. Square rod; 22. Sliding sleeve; 23. Handwheel; 24. Third support; 25. First permanent magnet ring; 26. Second permanent magnet ring; 27. Fourth support; 28. Servo motor; 29. Conductive slip ring; 30. Electromagnetic clutch; 31. Hanger; 32. Filter screen; 33. Cooling fan; 34. Connecting bracket; 35. Temperature sensor. Detailed implementation manners

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention. Embodiment

[0023] As Figures 1 to 8 shown, the embodiment of the present invention provides a lifting mechanism for a continuous stretching vacuum packaging machine, including a fixed frame 1, an upper frame 6, a controller, and two groups of machine-installed wall panels 2. The two groups of machine-installed wall panels 2 are respectively fixedly connected to the lower wall of the fixed frame 1 through two groups of diagonal braces 3. The upper frame 6 is used to install the lower die of the continuous stretching vacuum packaging machine; In order to achieve high-precision guidance and reduce frictional resistance during the lifting process, the upper frame 6 is slidably connected to the upper wall of the fixed frame 1 through a guiding structure. The guiding structure includes four groups of guide posts 5 and guide seats 4. The four groups of guide posts 5 are all fixedly connected to the lower wall of the upper frame 6 and are respectively close to the four corners of the lower wall of the upper frame 6. The four groups of guide seats 4 are all fixedly connected to the upper wall of the fixed frame 1 and are respectively aligned with a group of guide posts 5 up and down. The end of the guide post 5 away from the upper frame 6 sequentially penetrates the inner wall of the guide seat 4 and the inner wall of the fixed frame 1. A polytetrafluoroethylene sleeve is provided on the inner side wall of the guide seat 4. The guide post 5 penetrates the inner side wall of the polytetrafluoroethylene sleeve and is slidably connected thereto; The linear sliding of the guide post 5 in the guide seat 4 combined with the low-friction characteristics of the polytetrafluoroethylene sleeve ensures the vertical accuracy and smoothness of the lifting action of the upper frame 6, eliminates the stroke redundancy and jamming risks caused by multi-stage conversion of the traditional link mechanism, directly shortens the driving path, and solves the technical problem of too long action stroke; In order to achieve efficient transmission in a compact space and eliminate mechanical dead points, a rotating seat 12 is fixedly connected to the lower wall of the fixed frame 1. The inner side wall of the rotating seat 12 is rotatably connected to a threaded seat 13. The lower end of the threaded seat 13 is fixedly connected to a worm gear 14. A screw rod 7 is threadedly connected to the inner side wall of the threaded seat 13. The upper and lower ends of the screw rod 7 respectively penetrate through the upper and lower ends of the threaded seat 13, and the upper end of the screw rod 7 is rotatably connected to the lower wall of the upper frame 6. On the lower wall of the fixed frame 1 and on the left and right sides of the rotating seat 12, a first support 15 and a second support 17 are respectively fixedly connected. The inner side wall of the first support 15 is rotatably connected to a first rotating shaft 16. The inner side wall of the second support 17 is rotatably connected to a second rotating shaft 18. A worm 19 is fixedly connected between the opposite ends of the first rotating shaft 16 and the second rotating shaft 18. The axis of the worm 19 is perpendicular to the axis of the worm gear 14 in the front view projection. The worm 19 and the outer wall of the worm gear 14 are continuously enveloped and meshed with each other. On the lower wall of the fixed frame 1 and on the left side of the first support 15, a fourth support 27 is fixedly connected. A servo motor 28 is fixedly connected to the left wall of the fourth support 27. The output shaft of the servo motor 28 penetrates through the inner wall of the fourth support 27 and extends to the right side of the fourth support 27; By driving the worm 19 to act through the servo motor 28, the worm 19 drives the worm gear 14 to rotate. The worm gear 14 drives the screw rod 7 to lift and lower through the threaded seat 13, thereby realizing the lifting action of the upper frame 6. The right-angle meshing layout of the worm 19 and the worm gear 14 reduces the occupation of lateral space. At the same time, the continuous envelope meshing design avoids the instantaneous dead point jamming of traditional gear transmission, ensuring that the lifting action is continuous without interruption, and solving the technical problem of equipment locking caused by the motion dead point; In order to quickly switch to the manual operation mode when manual adjustment is required, the end of the output shaft of the servo motor 28 is connected to the first rotating shaft 16 through an electromagnetic clutch 30. The electromagnetic clutch 30 is powered by a conductive slip ring 29. A handwheel 23 for conveniently manually rotating the worm 19 is provided at the end of the second rotating shaft 18 away from the worm 19; When manual adjustment is required, the electromagnetic clutch 30 is powered off, the connection between the servo motor 28 and the worm 19 is disconnected, and after opening the box cover 10, the sliding sleeve 22 and the handwheel 23 are pulled out and can be immediately adjusted manually; To provide a convenient adsorption and fixation function and a quick connection function for the handwheel 23, a third support 24 is fixedly connected to the lower wall of the fixing frame 1 and on the right side of the second support 17. A sliding sleeve 22 is slidably connected to the inner side wall of the third support 24. The handwheel 23 is fixedly connected to one end of the sliding sleeve 22 away from the second rotating shaft 18. A magnetic adsorption structure for adsorption and fixation is arranged between the sliding sleeve 22 and the second rotating shaft 18. The magnetic adsorption structure includes a first permanent magnet ring 25 and a second permanent magnet ring 26. A retaining ring 20 is fixedly connected to the outer wall of one end of the second rotating shaft 18 away from the worm 19. The first permanent magnet ring 25 is fixedly connected to the right wall of the retaining ring 20. The second permanent magnet ring 26 is fixedly connected to one end of the sliding sleeve 22 facing the second rotating shaft 18. The opposite sides of the first permanent magnet ring 25 and the second permanent magnet ring 26 have opposite magnetic polarities. The sliding sleeve 22 and the second rotating shaft 18 are adsorbed and fixed to each other through the first permanent magnet ring 25 and the second permanent magnet ring 26; The magnetic adsorption effect of the first permanent magnet ring 25 and the second permanent magnet ring 26 enables the sliding sleeve 22 to be quickly adsorbed onto the second rotating shaft 18, simplifying the fixing method. When switching from the manual mode to the mechanical action mode, the sliding sleeve 22 and the second rotating shaft 18 are fixed through the magnetic adsorption effect, which can prevent the sliding sleeve 22 from axially moving during rotation. When switching from the mechanical action mode to the manual mode, only need to slightly pull the handwheel 23 towards the side away from the worm 19 with a force greater than the suction force between the first permanent magnet ring 25 and the second permanent magnet ring 26, then the sliding sleeve 22 and the handwheel 23 can be pulled out from the protective box 9 for manual adjustment operation. The second permanent magnet ring 26 plays a limiting role during the pulling out process of the sliding sleeve 22 to prevent the sliding sleeve 22 from separating from the square rod 21; To buffer the impact and vibration during the transmission process, a square rod 21 is fixedly connected to one end of the second rotating shaft 18 away from the worm 19. One end of the square rod 21 away from the second rotating shaft 18 penetrates through the inner side wall of the sliding sleeve 22 and is slidably connected to the sliding sleeve 22. The cross-section of the square rod 21 is square, and the shape of the inner side wall of the sliding sleeve 22 matches the outer shape of the square rod 21. The square rod 21 is coated with a vulcanized and bonded damping rubber layer, and the outer wall of the damping rubber layer is slidably connected to the inner side wall of the sliding sleeve 22; The damping rubber layer coated on the outer surface of the square rod 21 absorbs the instantaneous impact during rotation, reduces vibration noise, and at the same time plays a damping role between the square rod 21 and the sliding sleeve 22, further supplementing the fixing force of the magnetic adsorption structure; To achieve operation safety protection and electrical interlock, a protective box 9 is fixedly connected to the lower wall of the fixing frame 1 and near the right wall position. The third support 24 and the sliding sleeve 22 are both arranged inside the protective box 9. The right wall of the protective box 9 is rotatably connected with a box cover 10 through a hinge. The box cover 10 and the protective box 9 are locked through an electronic lock 11. Both the electronic lock 11 and the electromagnetic clutch 30 are controlled by a controller. When the electronic lock 11 is opened, the controller forcibly disconnects the power supply of the electromagnetic clutch 30; The electronic lock 11 is interlocked with the electromagnetic clutch 30 to ensure that the electromagnetic clutch 30 is automatically powered off when the protective box 9 is opened, preventing electrical misstart during manual operation, and providing dual protection of physical isolation and electrical safety; In order to actively dissipate heat for the servo motor 28 and the electromagnetic clutch 30 to extend the life of the components, a hanger 31 is fixedly connected to the lower wall of the fixed frame 1 and close to the left wall. The lower wall of the hanger 31 is provided with a heat dissipation structure for actively dissipating heat for the servo motor 28 and the electromagnetic clutch 30. The heat dissipation structure includes two groups of cooling fans 33. The lower wall of the hanger 31 is distributed on the left and right and is sequentially provided with two groups of openings. The inner wall of each group of openings is clamped with a group of filter screens 32. The two groups of cooling fans 33 are respectively fixedly connected to the upper wall of a group of filter screens 32. The two groups of cooling fans 33 correspond to the servo motor 28 and the electromagnetic clutch 30 above and below, respectively. Both groups of cooling fans 33 are magnetic levitation fans. The cooling fan 33 draws clean air through the filter 32, forming a forced airflow that covers the heat dissipation shell of the servo motor 28 and the outer shell of the electromagnetic clutch 30. The magnetic suspension design reduces self-vibration interference and noise, effectively lowering the operating temperature of the servo motor 28 and the electromagnetic clutch 30, and preventing overheating failures. In order to monitor the temperature abnormalities of key components in real time, a temperature detection structure for detecting the temperature rise of the servo motor 28 and the electromagnetic clutch 30 is provided on the lower wall of the fixing frame 1. The temperature detection structure includes two groups of temperature sensors 35. A group of connecting brackets 34 are fixedly connected to the lower wall of the fixing frame 1 and are located on the left and right sides of the fourth support 27. The two groups of temperature sensors 35 are respectively fixedly connected to the end of the group of connecting brackets 34 away from the fixing frame 1. The probes of the two groups of temperature sensors 35 are respectively aimed at the top surface of the heat dissipation shell of the servo motor 28 and the top surface of the shell of the electromagnetic clutch 30. Both groups of temperature sensors 35 are non-contact temperature measurement sensors. The temperature sensor 35 detects temperature changes in a non-contact manner. When an over-temperature signal is detected, the controller can activate the cooling fan 33 or trigger shutdown protection, thereby preventing the servo motor 28 or electromagnetic clutch 30 from performance degradation or damage due to overheating; In order to accurately feedback the lifting position of the upper shelf 6 to maintain packaging accuracy, a distance detection structure for detecting the distance between the upper shelf 6 and the fixed shelf 1 is provided on the upper wall of the fixed shelf 1. The distance detection structure includes two sets of distance sensors 8. The two sets of distance sensors 8 are fixedly connected to the upper wall of the fixed shelf 1 and are respectively close to the left wall and the right wall of the fixed shelf 1. The detection ends of the two sets of distance sensors 8 are both facing the lower wall of the upper shelf 6; The distance sensor 8 measures the distance change between the upper rack 6 and the fixed rack 1 in real time, and provides position feedback data to the controller to ensure that the lifting height is controlled within the set tolerance and meet the packaging machine's process requirements for film stretching accuracy.

[0024] Working principle: The linear sliding of the guide column 5 in the guide seat 4 cooperates with the low friction characteristics of the polytetrafluoroethylene sleeve to ensure the vertical accuracy and smoothness of the lifting action of the upper shelf 6, eliminates the stroke redundancy and jamming risk caused by the multi-stage conversion of the traditional connecting rod mechanism, directly shortens the drive path, and solves the technical problem of excessive stroke; the servo motor 28 drives the worm 19 to move, the worm 19 drives the worm wheel 14 to rotate, and the worm wheel 14 drives the screw 7 to move up and down through the threaded seat 13, thereby realizing the lifting action of the upper shelf 6. The right-angle meshing layout of the worm 19 and the worm wheel 14 reduces the lateral space occupation. At the same time, the continuous enveloping meshing design avoids the instantaneous dead point jamming of the traditional gear transmission, ensuring continuous and uninterrupted lifting action. , which solves the technical problem of the equipment being locked due to the dead point of movement; when manual adjustment is required, the electromagnetic clutch 30 is powered off, the connection between the servo motor 28 and the worm 19 is disconnected, and the handwheel 23 is pulled out after the box cover 10 is opened for immediate manual adjustment; the magnetic attraction of the first permanent magnet ring 25 and the second permanent magnet ring 26 enables the sleeve 22 to be quickly adsorbed onto the second rotating shaft 18, simplifying the fixing method. When switching from manual mode to mechanical action mode, the sleeve 22 and the second rotating shaft 18 are fixed by magnetic attraction, which can avoid axial movement of the sleeve 22 during rotation. When switching from mechanical action mode to manual mode, it is only necessary to pull the handwheel 23 toward the side away from the worm 19 with a little force, and the pulling force is greater than that of the first permanent magnet ring 25 The suction force between the second permanent magnetic ring 26 and the sleeve 22 can pull the hand wheel 23 out of the protective box 9 for manual adjustment operation. The second permanent magnetic ring 26 plays a limiting role in the process of pulling out the sleeve 22 to prevent the sleeve 22 from separating from the square rod 21; the shock-absorbing rubber layer coated on the outside of the square rod 21 absorbs instantaneous impact during rotation, reduces vibration noise, and at the same time plays a damping role between the square rod 21 and the sleeve 22, further supplementing the fixing force of the magnetic structure; the state of the electronic lock 11 and the electromagnetic clutch 30 is interlocked, ensuring that the electromagnetic clutch 30 is automatically powered off when the protective box 9 is opened, preventing electrical error startup during manual operation, and providing dual protection of physical isolation and electrical safety; the cooling fan 33 passes through the filter 32 Clean air is inhaled to form a forced airflow covering the heat dissipation shell of the servo motor 28 and the outer shell surface of the electromagnetic clutch 30. The magnetic levitation design reduces its own vibration interference, reduces noise, and effectively reduces the operating temperature of the servo motor 28 and the electromagnetic clutch 30 to prevent overheating failures; the temperature sensor 35 detects temperature changes in a non-contact manner. When an over-temperature signal is detected, the controller can link the cooling fan 33 or trigger shutdown protection, avoiding performance degradation or damage of the servo motor 28 or the electromagnetic clutch 30 due to overheating; the distance sensor 8 measures the distance change between the upper shelf 6 and the fixed frame 1 in real time, and provides position feedback data to the controller to ensure that the lifting height is controlled within the set tolerance, meeting the packaging machine's process requirements for film stretching accuracy.

[0025] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art will appreciate that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A lifting mechanism for a continuous stretching vacuum packaging machine, characterized in that: It includes a fixing frame (1), an upper frame (6), a controller, and two groups of installation wallboards (2). The two groups of installation wallboards (2) are respectively fixedly connected to the lower wall of the fixing frame (1) through two groups of diagonal braces (3). The upper frame (6) is slidably connected to the upper wall of the fixing frame (1) through a guiding structure. A rotating seat (12) is fixedly connected to the lower wall of the fixing frame (1). A threaded seat (13) is rotatably connected to the inner side wall of the rotating seat (12). A worm gear (14) is fixedly connected to the lower end of the threaded seat (13). A screw rod (7) is threadedly connected to the inner side wall of the threaded seat (13). The upper and lower ends of the screw rod (7) respectively penetrate through the upper and lower ends of the threaded seat (13), and the upper end of the screw rod (7) is rotatably connected to the lower wall of the upper frame (6). A first support (15) and a second support (17) are respectively fixedly connected to the lower wall of the fixing frame (1) and on the left and right sides of the rotating seat (12). A first rotating shaft (16) is rotatably connected to the inner side wall of the first support (15). A second rotating shaft (18) is rotatably connected to the inner side wall of the second support (17). A worm (19) is fixedly connected between the opposite ends of the first rotating shaft (16) and the second rotating shaft (18). The axis of the worm (19) is perpendicular to the axis of the worm gear (14) in the front view projection. The outer walls of the worm (19) and the worm gear (14) are continuously enveloped and meshed with each other. A fourth support (27) is fixedly connected to the lower wall of the fixing frame (1) and on the left side of the first support (15). A servo motor (28) is fixedly connected to the left wall of the fourth support (27). The output shaft of the servo motor (28) penetrates through the inner wall of the fourth support (27) and extends to the right side of the fourth support (27). The end of the output shaft of the servo motor (28) is connected to the first rotating shaft (16) through an electromagnetic clutch (30). The electromagnetic clutch (30) is powered by a conductive slip ring (29). A handwheel (23) for conveniently manually rotating the worm (19) is provided at the end of the second rotating shaft (18) away from the worm (19).

2. The lifting mechanism for a continuous stretching vacuum packaging machine according to claim 1, wherein: A third support (24) is fixedly connected to the lower wall of the fixing frame (1) and on the right side of the second support (17). A sliding sleeve (22) is slidably connected to the inner side wall of the third support (24). A handwheel (23) is fixedly connected to one end of the sliding sleeve (22) away from the second rotating shaft (18). A magnetic attraction structure for adsorbing and fixing is arranged between the sliding sleeve (22) and the second rotating shaft (18). A protective box (9) is fixedly connected to the lower wall of the fixing frame (1) and near the right wall. The third support (24) and the sliding sleeve (22) are both arranged inside the protective box (9). A box cover (10) is rotatably connected to the right wall of the protective box (9) through a hinge. The box cover (10) and the protective box (9) are locked through an electronic lock (11). A hanging frame (31) is fixedly connected to the lower wall of the fixing frame (1) and near the left wall. A heat dissipation structure for actively dissipating heat from the servo motor (28) and the electromagnetic clutch (30) is arranged on the lower wall of the hanging frame (31). A temperature detection structure for detecting the temperature rise of the servo motor (28) and the electromagnetic clutch (30) is arranged on the lower wall of the fixing frame (1). A distance detection structure for detecting the distance between the upper frame (6) and the fixing frame (1) is arranged on the upper wall of the fixing frame (1).

3. The lifting mechanism for a continuous stretching vacuum packaging machine according to claim 2, characterized in that: The guiding structure includes four guiding columns (5) and guiding seats (4). The four guiding columns (5) are all fixedly connected to the lower wall of the upper frame (6) and near the four corners of the lower wall of the upper frame (6) respectively. The four guiding seats (4) are all fixedly connected to the upper wall of the fixing frame (1) and are respectively aligned with a guiding column (5) up and down. One end of the guiding column (5) away from the upper frame (6) sequentially penetrates the inner wall of the guiding seat (4) and the inner wall of the fixing frame (1). A polytetrafluoroethylene sleeve is arranged on the inner side wall of the guiding seat (4). The guiding column (5) penetrates the inner side wall of the polytetrafluoroethylene sleeve and is slidably connected thereto.

4. The lifting mechanism for a continuous stretching vacuum packaging machine according to claim 3, characterized in that: The magnetic attraction structure includes a first permanent magnetic ring (25) and a second permanent magnetic ring (26). A retaining ring (20) is fixedly connected to the outer wall of one end of the second rotating shaft (18) away from the worm (19). The first permanent magnetic ring (25) is fixedly connected to the right wall of the retaining ring (20). The second permanent magnetic ring (26) is fixedly connected to one end of the sliding sleeve (22) facing the second rotating shaft (18). The opposite sides of the first permanent magnetic ring (25) and the second permanent magnetic ring (26) have opposite magnetic polarities. The sliding sleeve (22) and the second rotating shaft (18) are mutually adsorbed and fixed through the first permanent magnetic ring (25) and the second permanent magnetic ring (26).

5. The lifting mechanism for a continuous stretching vacuum packaging machine according to claim 4, wherein: One end of the second rotating shaft (18) away from the worm (19) is fixedly connected to a square rod (21). One end of the square rod (21) away from the second rotating shaft (18) penetrates the inner side wall of the sliding sleeve (22) and is slidably connected to the sliding sleeve (22). The cross section of the square rod (21) is square. The shape of the inner side wall of the sliding sleeve (22) matches the outer shape of the square rod (21). The square rod (21) is coated with a vulcanized and bonded damping rubber layer. The outer wall of the damping rubber layer is slidably connected to the inner side wall of the sliding sleeve (22).

6. The lifting mechanism for a continuous stretching vacuum packaging machine according to claim 5, characterized in that: The electronic lock (11) and the electromagnetic clutch (30) are both controlled by a controller. When the electronic lock (11) is opened, the controller forcibly cuts off the power supply of the electromagnetic clutch (30).

7. The lifting mechanism for a continuous stretching vacuum packaging machine according to claim 6, characterized in that: The heat dissipation structure includes two sets of cooling fans (33). Two openings are sequentially arranged on the lower wall of the hanger (31) in a left-right distribution. A filter screen (32) is clamped on the inner side wall of each opening. The two sets of cooling fans (33) are respectively fixedly connected to the upper walls of a set of filter screens (32). The two sets of cooling fans (33) are respectively vertically aligned with the servo motor (28) and the electromagnetic clutch (30).

8. The lifting mechanism for a continuous stretching vacuum packaging machine according to claim 7, characterized in that: The two sets of cooling fans (33) are both magnetic levitation fans.

9. The lifting mechanism for a continuous stretching vacuum packaging machine according to claim 8, characterized in that: The temperature detection structure includes two sets of temperature sensors (35). A connecting bracket (34) is fixedly connected to the lower wall of the fixing frame (1) and on the left and right sides of the fourth support (27). The two sets of temperature sensors (35) are respectively fixedly connected to one end of a set of connecting brackets (34) away from the fixing frame (1). The probes of the two sets of temperature sensors (35) are respectively aligned with the top surface of the heat dissipation shell of the servo motor (28) and the top surface of the outer shell of the electromagnetic clutch (30). The two sets of temperature sensors (35) are both non-contact temperature measurement sensors.

10. The lifting mechanism for a continuous stretching vacuum packaging machine according to claim 9, characterized in that: The distance detection structure includes two sets of distance sensors (8). The two sets of distance sensors (8) are both fixedly connected to the upper wall of the fixing frame (1) and are respectively close to the left wall and the right wall of the fixing frame (1). The detection ends of the two sets of distance sensors (8) both face the lower wall of the upper frame (6).

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