Wide-caliber heavy-film ultrasonic self-adaptive sealing device and control system

Abstract

The invention discloses a wide-caliber heavy-film ultrasonic self-adaptive sealing device and a control system, and relates to the technical field of ultrasonic sealing devices, and the wide-caliber heavy-film ultrasonic self-adaptive sealing device comprises an ultrasonic sealing device transmission module, a wide-caliber ultrasonic sealing module, a reconfigurable bottom film module, a supporting mounting plate and a sealing control system. The ultrasonic sealing device transmission module is responsible for moving the wide-caliber ultrasonic sealing module back and forth, and feeding, sealing and retracting of the device are achieved; an ultrasonic generating device in the wide-caliber ultrasonic sealing module is responsible for generating ultrasonic waves, meanwhile, the ultrasonic amplitude is expanded through an ultrasonic amplification rod, ultrasonic energy is transmitted to an ultrasonic sealing cutter, and an ultrasonic amplitude-change rod changes concentrated ultrasonic energy transmitted by the ultrasonic amplification rod; the ultrasonic sealing device is used for dispersing the amplitude of ultrasonic waves generated in a concentrated mode, so that mechanical vibration generated by the ultrasonic waves is more evenly distributed at the knife edge of the ultrasonic sealing knife, the ultrasonic sealing range is enlarged, and a wider bag opening can be effectively sealed.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of ultrasonic sealing devices, and particularly relates to a wide-aperture heavy-film ultrasonic self-adaptive sealing device and a control system. BACKGROUND

[0002] With the rapid development of modern packaging industry, higher requirements are put forward for the sealing quality and efficiency of packaging bags in the fields of food, medicine and chemical industry. Especially in the wide-aperture and heavy-film material packaging scene, the traditional sealing technology faces many challenges. The mainstream sealing devices on the market currently mostly adopt high-temperature heat sealing process, and the principle thereof is to melt the packaging material through a heating element. However, such technology has the following defects: firstly, high temperature easily causes deformation of the film material or damage to the heat-sensitive contents; secondly, the penetration force is insufficient for thick films or composite materials, and the sealing strength is difficult to guarantee; thirdly, the energy consumption is high and the equipment cooling time is long, which affects the production efficiency. In addition, when facing the packaging scene of overlapping or irregular shape of the bag opening edge, the traditional heat sealing device is difficult to realize uniform pressure, and the problems of loose sealing or leakage are easily caused. In recent years, ultrasonic sealing technology has gradually attracted attention due to its non-contact, low-temperature and high-efficiency characteristics. The technology realizes the intermolecular fusion of materials through high-frequency vibration friction, and is especially suitable for heat-sensitive materials.

[0003] For example, the ultrasonic sealing device for a packaging machine disclosed in the patent with the announcement number CN211167651U comprises a packaging machine body, a discharge port is inserted through the front side wall of the packaging machine body, a fixed plate is fixedly connected to the front side wall of the packaging machine body, first rotating rods are hinged to the both end side walls of the fixed plate, and supports are hinged to the other ends of the two first rotating rods. The utility model overcomes the defects of the prior art, has a reasonable design and compact structure, solves the problems of low efficiency, poor sealing quality and high material cost of manual packaging of the outer valve port bag, improves the working efficiency, improves the sealing effect and reduces the material cost, and the packaging bag can be smoothly discharged along the support plate without being easily damaged, so the utility model has strong practicability.

[0004] The above-mentioned patent has the following defects in the use process:

[0005] The upper mold is provided with a single ultrasonic generator to quickly melt and seal the valve port of the packaging bag, but the ultrasonic action range of the single ultrasonic generator is limited, which is difficult to adapt to the packaging demand of a wide caliber, resulting in uneven energy distribution in the sealing area, poor edge sealing effect, and the sealing process relies on the upper mold cylinder driving the upper mold downward when the lower mold is driven upward by the lower mold cylinder, which is a direct driving mode of the upper and lower molds, and when there is overlap or wrinkle at the edge of the packaging bag, the sealing reliability is reduced due to uneven contact pressure, and at the same time, the intelligent degree of the control system is insufficient, and there is a lack of real-time feedback adjustment of variables such as material thickness and tension fluctuation, resulting in process parameter solidification, which is difficult to adapt to the flexible production demand of multi-specification products, therefore, the present application provides a wide-caliber heavy-film ultrasonic self-adaptive sealing device and control system. SUMMARY

[0006] The present application provides a wide-caliber heavy-film ultrasonic self-adaptive sealing device and control system, wherein the ultrasonic sealing device transmission module is responsible for moving the wide-caliber ultrasonic sealing module forward and backward, realizing the feeding, sealing and withdrawing of the device; the ultrasonic generating device in the wide-caliber ultrasonic sealing module is responsible for generating ultrasonic waves, at the same time, the ultrasonic amplitude rod enlarges the ultrasonic amplitude, and transmits the ultrasonic energy to the ultrasonic sealing knife, and the ultrasonic amplitude rod changes the concentrated ultrasonic energy transmitted by the ultrasonic amplitude rod, which is used to disperse the concentrated ultrasonic amplitude, so that the mechanical vibration generated by the ultrasonic wave is more uniformly distributed at the knife edge of the ultrasonic sealing knife, the range of ultrasonic sealing is enlarged, which can effectively seal wider bag opening, and due to the uniform energy distribution, the problems of over-melting or insufficient melting in some areas caused by energy concentration are avoided, thereby improving the sealing quality of wide-caliber bag opening; the reconfigurable bottom film module adjusts the curvature according to the heavy film characteristics of the packaging bag to ensure that the ultrasonic knife edge is uniformly pressed, and the pressure sensor is integrated in the knife head of the ultrasonic sealing knife to monitor the pressure at the knife head in real time, and after sensing the instantaneous pressure fluctuation caused by the difference in bag material, thickness change, slight unevenness or overlapping part, it feeds back to the sealing control system in time for real-time adjustment to improve the adaptability to different packaging materials, realize higher quality and more reliable sealing, and solve the problems in the background art.

[0007] To solve the above technical problems, the present application is realized by the following technical scheme:

[0008] The wide-caliber heavy-film ultrasonic self-adaptive sealing device and control system of the present application comprises:

[0009] The ultrasonic sealing device transmission module, the wide-caliber ultrasonic sealing module, the reconfigurable bottom film module, the support installation plate and the sealing control system are electrically connected by wires respectively;

[0010] The ultrasonic sealing device transmission module comprises a servo motor, a planetary reducer, a shaft coupling, a bidirectional ball screw mechanism and a guide rail slider mechanism, the output end of the servo motor is connected with the planetary reducer, the bidirectional ball screw mechanism is composed of an upper fixed seat of a screw rod, a lower fixed seat of the screw rod, a ball screw rod and a ball screw nut, the output end of the planetary reducer is connected with one end of the ball screw rod through the shaft coupling, the support mounting plate is connected with the upper fixed seat of the screw rod and the lower fixed seat of the screw rod respectively, and the ball screw rod is rotatably connected between the upper fixed seat of the screw rod and the lower fixed seat of the screw rod, and the ball screw nut is threadedly connected with the ball screw rod.

[0011] Further, the guide rail slider mechanism is composed of a slider, a cylindrical guide rail and a guide rail fixed seat, the support mounting plate is fixedly connected with a pair of guide rail fixed seats, and a pair of cylindrical guide rails are fixedly connected on the pair of guide rail fixed seats, and a pair of sliders are sleeved on the outer walls of the cylindrical guide rails and are slidably connected with the outer walls.

[0012] Further, a first groove is excavated on one side of the support mounting plate, an L-shaped motor mounting plate is fixedly connected to the inner wall of the first groove, a positioning table is fixedly connected to the top end of the support mounting plate close to the middle, three through holes are excavated in the positioning table, and the positioning table is sleeved on the outer walls of the ball screw rod and the pair of cylindrical guide rails through the three through holes.

[0013] Further, the wide-caliber ultrasonic sealing module comprises an ultrasonic wave generating device, an ultrasonic wave amplification rod, an ultrasonic wave amplitude rod, an ultrasonic wave mounting plate and an ultrasonic wave sealing knife, the ultrasonic wave amplification rod and a pair of ultrasonic wave amplitude rods are fixed on the ultrasonic wave mounting plate, the ultrasonic wave mounting plate is vertically arranged with the support mounting plate and is rigidly connected with the pair of sliders and the ball screw nut through screws, one side of the ultrasonic wave generating device is fixedly connected with one end of the ultrasonic wave amplification rod, a pair of ultrasonic wave amplitude rods are arranged on both sides of the ultrasonic wave amplification rod, one end of the pair of ultrasonic wave amplitude rods is connected with the back of the ultrasonic wave sealing knife through a connecting piece, a shallow groove is excavated on the back of the ultrasonic wave sealing knife, and a pressure sensor is integrated on the head of the ultrasonic wave sealing knife.

[0014] Further, the reconfigurable bottom film module comprises a sheet-shaped bottom film composed of a plurality of bottom film pieces, the tail of each bottom film piece is dovetail-shaped, the outer side of the sheet-shaped bottom film is provided with a bottom film base, the bottom film base is provided with a second groove, a rubber pad and a support plate are respectively embedded in the second groove, the plurality of bottom film pieces are fixed in the bottom film base by the extrusion of the rubber pad and the support plate, the plurality of bottom film pieces are arranged in a close parallel manner in the bottom film base, a plurality of anti-skid convex particles are arranged on the side of the sheet-shaped bottom film close to the ultrasonic sealing knife, a group of first screws and second screws are respectively screwed on one side of the bottom film base, the first screws and the second screws are arranged in parallel along the bottom film base, one end of each of the first screws and the second screws is in contact with the side of the support plate away from the rubber pad, a bottom film mounting plate and a plurality of bottom film fixing bolts are respectively arranged on one side of the bottom film base, the bottom film base is connected to the bottom film mounting plate through the plurality of bottom film fixing bolts, the cutting edge of the ultrasonic sealing knife is aligned with the side of the sheet-shaped bottom film close to the ultrasonic sealing knife, and a plurality of jackscrews are screwed on one side of the bottom film mounting plate, the jackscrews are used to adjust the parallelism of the contact surface of the sheet-shaped bottom film and the ultrasonic sealing knife.

[0015] Further, the two sides of the sheet-shaped bottom film are provided with a pair of bottom film baffles, and the pair of bottom film baffles are respectively installed on the two sides of the bottom film base through screws.

[0016] Further, a pair of round through holes are drilled in the bottom film mounting plate, the bottom film mounting plate is sleeved on the outer wall of a pair of cylindrical guide rails through the pair of round through holes, the outer wall of the pair of cylindrical guide rails is processed with a shoulder close to the two ends and is threaded, a hexagonal nut is threadedly connected to the outer wall of the cylindrical guide rail close to the two ends, a pair of spacers are sleeved on the outer wall of the pair of cylindrical guide rails, and the pair of spacers are in contact with the bottom film mounting plate, one end of the pair of hexagonal nuts on one side is in close contact with the side of the positioning table close to the L-shaped motor mounting plate, and one end of the pair of hexagonal nuts on the other side is in close contact with the pair of spacers.

[0017] Further, the inside of the sealing control system is provided with a controller, and the controller stores a sealing control program, the sealing control program is specifically used to realize a sealing work control process, and the sealing work control process comprises the following steps:

[0018] Step one: setting the expected pressure value p of the ultrasonic sealing knife according to the characteristics of the sealing bag exp ;

[0019] Step two: outputting the servo motor current I0 according to the expected pressure to drive the bidirectional ball screw mechanism to drive the wide-caliber ultrasonic sealing module to move forward

[0020] Step three: the ultrasonic sealing knife is pressed tightly, and the pressure sensor monitors the pressure p of the knife edge in real time, and when the pressure exceeds 1.2p exp When the pressure exceeds 1.2p, the hardware level power-off protection is triggered;

[0021] Step four: the PID controller adjusts the servo motor current I in real time according to the pressure sensor reading;

[0022] Step five: when the desired pressure p is reached, the ultrasonic wave generating device starts to work, and the sealing action is performed; exp

[0023] Step six: the sealing is completed, and the servo motor is reversed to complete the tool withdrawal action.

[0024] Further, according to the characteristics of the servo motor and the mechanical principle, a mathematical model of the ultrasonic automatic sealing device is established, and the servo motor current I is adjusted to control the output torque T of the servo motor, wherein k t is the motor torque constant:

[0025]

[0026] The screw thrust F is represented as:

[0027]

[0028] Wherein η is the transmission efficiency, P is the lead of the screw,

[0029] Considering the rigidity and transmission structure of the device, the unit area pressure p of the ultrasonic sealing knife edge is:

[0030]

[0031] Wherein A is the area of the knife edge.

[0032] Further, the desired pressure controller adopts a fuzzy control algorithm, and the PID controller adjusts the output current according to the following formula:

[0033]

[0034] Wherein the proportional coefficient K p , the integral coefficient K i , and the differential coefficient K d are adjusted in the range of [0.5, 5], [0.01, 1], [0.001, 0.5] respectively.

[0035] The present application has the following beneficial effects compared with the prior art:

[0036] 1、The ultrasonic sealing device transmission module arranged in the technical solution is responsible for moving the wide-caliber ultrasonic sealing module forward and backward, realizing the tool feeding, sealing and tool withdrawal of the device. ​

[0037] 2、The wide-aperture ultrasonic sealing module sets the ultrasonic wave generating device responsible for the generation of ultrasonic waves, and at the same time expands the ultrasonic wave amplitude through the ultrasonic wave amplification rod, and transmits the ultrasonic wave energy to the ultrasonic sealing knife, and the ultrasonic wave amplitude rod changes the concentrated ultrasonic wave energy transmitted by the ultrasonic wave amplification rod, which is used to disperse the concentrated ultrasonic wave amplitude, so that the mechanical vibration generated by the ultrasonic wave is more evenly distributed at the knife edge of the ultrasonic sealing knife, which expands the range of ultrasonic sealing, and can effectively seal the wider bag opening, and because the energy is evenly distributed, the problem of over-melting or insufficient melting in some areas caused by energy concentration is avoided, thereby improving the sealing quality of the wide-aperture bag opening.

[0038] 3、The reconfigurable bottom film module is set according to the heavy film characteristics of the packaging bag to adjust the curvature, ensure that the ultrasonic knife edge is uniformly pressed, and the pressure sensor is integrated in the knife head of the ultrasonic sealing knife, which can monitor the pressure at the knife head in real time, and feedback to the sealing control system in time when the instantaneous pressure fluctuation caused by the difference in bag material, thickness change, slight unevenness or overlapping part is sensed, so as to make real-time adjustment, improve the adaptability to different packaging materials, and realize higher quality and more reliable sealing.

[0039] Of course, implementing any product of the present application does not necessarily require all the advantages described above. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0041] Figure 1 It is a perspective structural schematic diagram of a wide-aperture heavy film ultrasonic self-adaptive sealing device and control system of the present application.

[0042] Figure 2 It is a perspective structural schematic diagram of a wide-aperture heavy film ultrasonic self-adaptive sealing device and control system of the present application. Figure 1 It is an enlarged structural schematic diagram of A in the present application.

[0043] Figure 3 It is a perspective structural schematic diagram of a wide-aperture heavy film ultrasonic self-adaptive sealing device and control system of the present application.

[0044] Figure 4 It is a perspective structural schematic diagram of a wide-aperture heavy film ultrasonic self-adaptive sealing device and control system of the present application.

[0045] Figure 5The schematic diagram of the three-dimensional structure of the reconfigurable bottom film module in the application

[0046] Figure 6 The exploded view of the reconfigurable bottom film module in the application

[0047] Figure 7 The schematic diagram of the side view structure of the reconfigurable bottom film module in the application

[0048] Figure 8 The control system flow chart of the wide-aperture heavy film ultrasonic self-adaptive sealing device and control system in the application.

[0049] In the drawings, the components represented by each reference numeral are listed as follows:

[0050] 1, ultrasonic sealing device transmission module; 101, servo motor; 102, planetary reducer; 103, L-shaped motor mounting plate; 104, shaft coupling; 105, upper fixed seat of lead screw; 106, lower fixed seat of lead screw; 107, ball screw; 108, sliding block; 109, ball screw nut; 1010, cylindrical guide rail; 1011, guide rail fixed seat; 2, wide-aperture ultrasonic sealing module; 201, ultrasonic generating device; 202, ultrasonic amplification rod; 203, ultrasonic amplitude rod; 204, ultrasonic mounting plate; 205, ultrasonic sealing knife; 3, reconfigurable bottom film module; 301, sheet-shaped bottom film; 302, bottom film sheet; 303, bottom film baffle; 304, rubber pad; 305, support plate; 306, bottom film base; 307, first screw; 308, second screw; 309, bottom film mounting plate; 3010, jackscrew; 3011, bottom film fixing bolt; 4, support mounting plate. DETAILED DESCRIPTION

[0051] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the application.

[0052] In the description of the application, it should be understood that the terms "relative", "one end", "internal", "lateral", "end", "two ends", "two sides", "front", "one end surface", "the other end surface" and the like indicate the orientation or positional relationship, which are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the application. Specific embodiment 1

[0054] Please refer toFigures 1-8 The wide-aperture heavy-film ultrasonic self-adaptive sealing device and control system comprises:

[0055] The ultrasonic sealing device transmission module 1, the wide-aperture ultrasonic sealing module 2, the reconfigurable bottom film module 3, the support mounting plate 4, and the sealing control system are electrically connected through wires.

[0056] The ultrasonic sealing device transmission module 1 comprises a servo motor 101, a planetary reducer 102, a shaft coupling 104, a bidirectional ball screw mechanism, and a guide rail slider mechanism. The output end of the servo motor 101 is connected to the planetary reducer 102. The bidirectional ball screw mechanism is composed of an upper fixed seat 105, a lower fixed seat 106, a ball screw 107, and a ball screw nut 109. The output end of the planetary reducer 102 is connected to one end of the ball screw 107 through the shaft coupling 104. The support mounting plate 4 is connected to the upper fixed seat 105 and the lower fixed seat 106, and the ball screw 107 is rotatably connected between the upper fixed seat 105 and the lower fixed seat 106. The ball screw nut 109 is threadedly connected to the ball screw 107.

[0057] During the implementation process, under the control of the sealing control system, when ultrasonic sealing is required, the servo motor 101 is driven to rotate, and the planetary reducer 102 is used to reduce the speed and increase the torque. The planetary reducer 102 transmits the rotary motion to the ball screw 107 through the shaft coupling 104, drives the ball screw 107 to rotate, and drives the wide-aperture ultrasonic sealing module 2 installed on the ball screw nut 109 to move forward relative to the ball screw 107, clamping the bag opening. When the sealing is completed, the servo motor 101 is driven to rotate in the opposite direction, driving the wide-aperture ultrasonic sealing module 2 installed on the ball screw nut 109 to move backward relative to the ball screw 107, releasing the sealed bag, and achieving the functions of feeding, sealing, and retracting.

[0058] The guide rail slider mechanism is composed of a slider 108, a cylindrical guide rail 1010, and a guide rail fixed seat 1011. The support mounting plate 4 is fixedly connected to a pair of guide rail fixed seats 1011, and a pair of cylindrical guide rails 1010 are fixedly connected to the pair of guide rail fixed seats 1011. A pair of sliders 108 are sleeved on the outer walls of the cylindrical guide rails 1010 and are slidably connected thereto.

[0059] The slider 108 moves along the cylindrical guide rail 1010 together with the ball screw nut 109, assisting the movement of the wide-aperture ultrasonic sealing module 2, enabling it to accurately, smoothly, and quickly complete the actions of feeding, sealing, and retracting.

[0060] The one side of the support mounting plate 4 is excavated with a first groove, and the inner wall of the first groove is fixedly connected with an L-shaped motor mounting plate 103, and the top end of the support mounting plate 4 is fixedly connected with a positioning table close to the middle, the positioning table is excavated with three through holes, and the positioning table is respectively sleeved on the outer walls of the ball screw 107 and the pair of cylindrical guide rails 1010 through the three through holes.

[0061] Through the first groove and the L-shaped motor mounting plate 103, the reliable installation and accurate positioning of the servo motor 101 are realized, and through the positioning table and the three through holes thereon, the accurate axial and transverse positioning of the ball screw 107 and the cylindrical guide rail 1010 are realized.

[0062] The wide-caliber ultrasonic sealing module 2 includes an ultrasonic generating device 201, an ultrasonic amplification rod 202, an ultrasonic amplitude rod 203, an ultrasonic mounting plate 204 and an ultrasonic sealing knife 205, the ultrasonic amplification rod 202 and the pair of ultrasonic amplitude rods 203 are fixed on the ultrasonic mounting plate 204, the ultrasonic mounting plate 204 is vertically arranged with the support mounting plate 4, and is rigidly connected with the pair of sliding blocks 108 and the ball screw nut 109 through screws, one side of the ultrasonic generating device 201 is fixedly connected with one end of the ultrasonic amplification rod 202, the pair of ultrasonic amplitude rods 203 are arranged on the two sides of the ultrasonic amplification rod 202, and one end of the pair of ultrasonic amplitude rods 203 is connected with the back of the ultrasonic sealing knife 205 through a connecting piece, the back of the ultrasonic sealing knife 205 is excavated with a shallow groove, and the head of the ultrasonic sealing knife 205 is integrated with a pressure sensor.

[0063] When the ultrasonic sealing knife 205 clamps the bag opening, the ultrasonic generating device 201 starts to generate ultrasonic waves, expands the ultrasonic amplitude through the ultrasonic amplification rod 202, and transmits the ultrasonic energy to the ultrasonic sealing knife 205, and the ultrasonic amplitude rod 203 changes the concentrated ultrasonic energy transmitted by the ultrasonic amplification rod 202, so as to disperse the concentrated ultrasonic amplitude and make the mechanical vibration generated by the ultrasonic waves more uniformly distributed at the knife edge of the ultrasonic sealing knife 205, thereby expanding the range of ultrasonic sealing, effectively sealing wider bag openings, and due to the uniform energy distribution, avoiding the problems of over-melting in some areas or insufficient melting in some areas caused by energy concentration, thereby improving the sealing quality of the wide-caliber bag opening, and the pressure sensor integrated in the head of the ultrasonic sealing knife 205 can monitor the pressure received by the head in real time, and timely feedback to the sealing control system when the instantaneous pressure fluctuation caused by the difference in bag material, thickness change, slight unevenness or overlapping part is sensed, so as to adjust the ultrasonic sealing knife 205 through pressure feedback, so as to realize good sealing effect and improve safety.

[0064] The reconfigurable bottom film module 3 comprises a sheet-shaped bottom film 301, the sheet-shaped bottom film 301 is composed of a plurality of bottom film pieces 302, the tail of the bottom film piece 302 is dovetail-shaped, the outer side of the sheet-shaped bottom film 301 is provided with a bottom film base 306, the second groove is opened in the bottom film base 306, and the rubber pad 304 and the support plate 305 are respectively embedded in the second groove, the plurality of bottom film pieces 302 are fixed in the inside of the bottom film base 306 through the extrusion of the rubber pad 304 and the support plate 305, and the plurality of bottom film pieces 302 are arranged and distributed in a close parallel manner in the inside of the bottom film base 306, the side of the sheet-shaped bottom film 301 close to the ultrasonic sealing knife 205 is provided with a plurality of anti-skid convex particles, one side of the bottom film base 306 is respectively threadedly connected with a group of first screws 307 and a group of second screws 308, the first screws 307 and the second screws 308 are arranged in parallel along the bottom film base 306, one end of the first screws 307 and the second screws 308 is in contact with the side of the support plate 305 away from the rubber pad 304, one side of the bottom film base 306 is respectively provided with a bottom film mounting plate 309 and a plurality of bottom film fixing bolts 3011, the bottom film base 306 is connected with the bottom film mounting plate 309 through the plurality of bottom film fixing bolts 3011, the cutting edge of the ultrasonic sealing knife 205 is aligned with the side of the sheet-shaped bottom film 301 close to the ultrasonic sealing knife 205, and the side of the bottom film mounting plate 309 is threadedly connected with a plurality of jackscrews 3010, and the jackscrews 3010 are used for adjusting the parallelism of the contact surface of the sheet-shaped bottom film 301 and the ultrasonic sealing knife 205.

[0065] Before the ultrasonic sealing device is used, the support plate 305, the rubber pad 304 and the sheet-shaped bottom film 301 are sequentially loaded into the bottom film base 306 from the side, then a pair of bottom film baffles 303 are installed on both sides of the bottom film base 306 to prevent left and right shaking, then a group of first screws 307 and a group of second screws 308 are sequentially installed, the internal components are fixed, the jackscrews 3010 are adjusted according to the heavy film condition of the packaging bag, the parallelism of the contact surface of the sheet-shaped bottom film 301 and the ultrasonic sealing knife 205 is adjusted through the screwing in and screwing out of the jackscrews 3010, and it is ensured that the ultrasonic sealing knife 205 is in full contact with the sealing part of the packaging bag. When the ultrasonic sealing knife 205 moves downward under the drive of the transmission module 1 of the ultrasonic sealing device, the cutting edge contacts the bag opening of the packaging bag and also contacts the sheet-shaped bottom film 301. Under the monitoring of the pressure sensor, the cutting edge and the sheet-shaped bottom film 301 jointly press the bag opening of the packaging bag, and the anti-skid convex particles on the sheet-shaped bottom film 301 increase the friction with the bag opening to prevent the bag opening from sliding during sealing.

[0066] The two sides of the sheet-shaped bottom film 301 are provided with the bottom film baffles 303, and the pair of bottom film baffles 303 are respectively installed on the two sides of the bottom film base 306 through screws.

[0067] After the support plate 305, the rubber pad 304 and the sheet-shaped bottom film 301 are sequentially loaded into the bottom film base 306 from the side, a pair of bottom film baffle plates 303 are driven to be installed on both sides of the bottom film base 306 to prevent left and right shaking.

[0068] The bottom film mounting plate 309 is sleeved on the outer wall of the pair of cylindrical guide rails 1010 through the pair of round through holes, the outer wall of the pair of cylindrical guide rails 1010 is close to both ends and is processed with a shoulder and is threaded, the outer wall of the cylindrical guide rail 1010 is close to both ends and is threadedly connected with a hexagonal nut, the outer wall of the pair of cylindrical guide rails 1010 is sleeved with a gasket, and the pair of gaskets are in contact with the bottom film mounting plate 309, one end of the pair of hexagonal nuts on one side is in close contact with the side close to the L-shaped motor mounting plate 103 of the positioning table, and one end of the pair of hexagonal nuts on the other side is in close contact with the pair of gaskets.

[0069] The bottom film mounting plate 309 is sleeved on the cylindrical guide rail 1010 through the round through hole, so that the bottom film mounting plate 309 can move along the axis direction of the cylindrical guide rail 1010, ensuring that the ultrasonic sealing knife 205 and the sheet-shaped bottom film 301 can accurately move relative to each other to realize the feeding and retracting actions. Specific embodiment 2:

[0071] Please refer to Figures 1-8 In a preferred embodiment, the inside of the sealing control system is provided with a controller, and the controller stores a sealing control program, which is specifically used to realize a sealing work control process, and the sealing work control process includes the following steps:

[0072] Step one: set the expected pressure value p of the ultrasonic sealing knife 205 according to the characteristics of the sealing bag exp ;

[0073] Step two: control the servo motor 101 current I0 according to the expected pressure to drive the wide-caliber ultrasonic sealing module 2 to advance;

[0074] Step three: the ultrasonic sealing knife 205 presses the bag opening, and the pressure sensor monitors the knife edge pressure p in real time, and triggers the hardware level power-off protection when the pressure exceeds 1.2p exp ;

[0075] Step four: the PID controller adjusts the servo motor 101 current I in real time according to the pressure sensor reading;

[0076] Step five: when the expected pressure p exp is reached, the ultrasonic wave generating device 201 starts to work and performs sealing action;

[0077] Step six: the sealing is completed, the servo motor 101 is reversed to complete the tool withdrawal action.

[0078] According to the characteristics of the servo motor 101 and the mechanical principle, a mathematical model of the ultrasonic automatic sealing device is established, and the output torque T of the servo motor 101 is controlled by adjusting the current I of the servo motor 101, wherein k t is the motor torque constant, which can be obtained through the technical manual of the motor:

[0079]

[0080] The screw thrust F is represented as:

[0081]

[0082] Wherein η is the transmission efficiency, which can be obtained from the experience value range according to the specific type of the bidirectional ball screw mechanism and the guide rail slider mechanism by referring to the relevant mechanical design data; P is the lead of the screw, which is determined by the selected ball screw 107, and the value can be obtained from the product specification parameters;

[0083] Considering the rigidity and transmission structure of the device, the unit area pressure p of the knife edge of the ultrasonic sealing knife 205 is:

[0084]

[0085] Wherein A is the area of the knife edge, which can be calculated according to the actual size of the ultrasonic sealing knife 205.

[0086] In the present application, it is expected that the pressure controller adopts a fuzzy control algorithm to realize the initial motor current prediction, and the input is the heavy film coefficient R, the film thickness H and the sealing width W, and the output is the initial motor current I0; The heavy film coefficient R is defined as the ratio of the total number of film layers in the sealing area of the bag opening to the number of middle layer films, which reflects the compaction difficulty of the sealing part. When the R value is larger (such as ≥2.5), a larger thrust and current need to be applied; The larger the sealing width, the more uniform the required pressure, and the initial current is correspondingly adjusted; The thicker the film layer, the more ultrasonic energy is absorbed, and the initial pressure needs to be increased to achieve sufficient contact.

[0087] According to the experience of experts, the fuzzy rules are formulated, and the trigonometric function is selected as the membership function of each variable, and part of the core rules are shown in the following table:

[0088] Rule number Re-coating factor R (p / p) Film layer thickness H (mm) Sealing width W (cm) Output current I0 (A) R1 Low (<1.0) Thin (<0.08) Narrow (<40) Low (0.5~0.8) R2 Medium (1.0~3) Thin (<0.08) Narrow (<40) Medium (0.8~1.2) R3 High (>3) Thin (<0.08) Narrow (<40) Medium (1.0~1.5) R4 High (>3) Thick (>0.14) Wide (>80) High (1.8~2.5) R5 Medium Medium Medium Medium (1.0~1.5) R6 Low Thick Wide Medium (1.2~1.8) R7 Low Thin Wide Medium (1.0~1.3) R8 High Medium Narrow Medium (1.2~1.5) R9 High Thick Medium High (1.6~2.2)

[0089] After the input variables of the controller are fuzzed, the output level is judged by the fuzzy inference rule table, and finally the numerical form I0 is obtained by defuzzification through the center of gravity method, and the calculation formula is as follows:

[0090]

[0091] The method can adapt to the structural characteristics of different packaging bags, and improve the sealing stability and safety.

[0092] In the ultrasonic adaptive sealing control system of the application, the unit area pressure of the ultrasonic sealing knife 205 during the sealing process is a key control quantity affecting the sealing quality and safety. To realize accurate regulation of the pressure, a pressure sensor is integrated on the head of the ultrasonic sealing knife 205, and a PID controller is combined to realize real-time closed-loop adjustment of the driving current I of the servo motor 101.

[0093] Specifically, the system first sets a target sealing pressure p exp The value is determined according to the sealing material, structure and process parameters, and can be obtained through pre-experiment or empirical formula. Subsequently, during the sealing process, the pressure sensor collects the pressure value p(t) of the current ultrasonic sealing knife 205 in real time, and calculates the error with the set target value:

[0094]

[0095] The error is transmitted to the PID control module as the input quantity of the controller. The PID controller adjusts the current I(t) of the servo motor 101 using the following standard control law:

[0096]

[0097] Wherein, the proportional coefficient K p ∈[0.5,5], the control error response rate;

[0098] The integral coefficient K i ∈[0.01,1], used to eliminate steady-state error;

[0099] The differential coefficient K d ∈[0.001,0.5], used to suppress response oscillation;

[0100] The coefficient initial value can be selected by Ziegler-Nichols critical proportion method or test curve setting method.

[0101] The controller samples the feedback data of the pressure sensor every Δt milliseconds (typical sampling period is 5-20 ms), updates the motor driving current I(t) through the above algorithm, and changes the motor current to drive the bidirectional ball screw mechanism to fine-tune the position of the wide-aperture ultrasonic sealing module 2, thereby realizing real-time adjustment of the sealing pressure.

[0102] In actual implementation, to avoid current fluctuations caused by instantaneous errors, the following mechanism is introduced in the controller design:

[0103] Pressure tolerance band mechanism: when p(t)∈[0.95p exp ,1.05p exp ], it is considered stable, and the current is not adjusted;

[0104] Amplitude limiting protection mechanism: the motor current I(t) is set with upper and lower limits (such as [0.5A, 2.5A]), to avoid overcurrent risk;

[0105] Hardware power-off protection: when p(t)>1.2p exp for more than 0.2s, the system automatically performs power-off operation to protect the sealing film structure and the motor device.

[0106] The pressure regulation process can achieve millisecond-level response speed, is suitable for high-frequency sealing tasks, and has good robustness and adaptive performance. The above PID parameters can be pre-set by empirical tuning method or critical proportion method according to different bag body structures.

[0107] The circuits, electronic components and chip modules involved in the application are all prior art, and can be realized by those skilled in the art without further description. The content protected by the application does not involve improvement of software and methods.

[0108] The standard parts used in the application file can be purchased from the market. All components in the application file can be ordered according to the description and drawings. The specific connection mode of each part adopts the conventional screw, rivet, welding and other conventional means in the prior art. The mechanical parts and equipment adopt conventional types in the prior art. The electrical components in this paper are electrically connected with the main controller and power supply, and the main controller is a conventional known device that can play a control role.

[0109] The preferred embodiments of the application disclosed above are only used to help explain the application. The preferred embodiments do not describe all the details and do not limit the application to the specific embodiments described. Obviously, many modifications and changes can be made according to the content of the specification. The embodiments are selected and described in detail in order to better explain the principles and practical applications of the application, so that those skilled in the art can well understand and utilize the application. The application is limited by the claims and their entire scope and equivalents.

Claims

1. A wide mouth heavy gauge film ultrasonic self-adapting closure device, characterized by, The utility model relates to an ultrasonic sealing device drive module (1), a wide-caliber ultrasonic sealing module (2), a reconfigurable bottom film module (3), a support mounting plate (4) and a sealing control system, and the sealing control system is electrically connected with the ultrasonic sealing device drive module (1) and the wide-caliber ultrasonic sealing module (2) through wires respectively. The ultrasonic sealing device drive module (1) comprises a servo motor (101), a planetary reducer (102), a shaft coupling (104), a bidirectional ball screw mechanism and a guide rail slider mechanism, the output end of the servo motor (101) is connected with the planetary reducer (102), the bidirectional ball screw mechanism is composed of an upper fixed seat (105) of a screw rod, a lower fixed seat (106) of the screw rod, a ball screw rod (107) and a ball screw nut (109), the output end of the planetary reducer (102) is connected with one end of the ball screw rod (107) through the shaft coupling (104), the support mounting plate (4) is connected with the upper fixed seat (105) of the screw rod and the lower fixed seat (106) of the screw rod respectively, and the ball screw rod (107) is rotatably connected between the upper fixed seat (105) of the screw rod and the lower fixed seat (106) of the screw rod, and the ball screw nut (109) is threadedly connected with the ball screw rod (107). The guide rail slider mechanism is composed of a slider (108), a cylindrical guide rail (1010) and a guide rail fixed seat (1011), the support mounting plate (4) is fixedly connected with a pair of guide rail fixed seats (1011), and a pair of cylindrical guide rails (1010) are fixedly connected on the pair of guide rail fixed seats (1011), and a pair of sliders (108) are sleeved on the outer walls of the cylindrical guide rails (1010) and are slidably connected with the cylindrical guide rails (1010).

2. A wide aperture heavy film ultrasonic self-sealing closure device according to claim 1, wherein, One side of the support mounting plate (4) is provided with a first groove, and the inner wall of the first groove is fixedly connected with an L-shaped motor mounting plate (103), the top end of the support mounting plate (4) is fixedly connected with a positioning table, the positioning table is provided with three through holes, and the positioning table is sleeved on the outer walls of the ball screw rod (107) and the pair of cylindrical guide rails (1010) through the three through holes.

3. A wide aperture heavy film ultrasonic self-sealing closure device according to claim 2, wherein, ​ 4. The wide aperture heavy film ultrasonic self-sealing closure of claim 2, wherein, The wide-aperture ultrasonic sealing module (2) comprises an ultrasonic generating device (201), an ultrasonic amplification rod (202), an ultrasonic amplitude rod (203), an ultrasonic mounting plate (204) and an ultrasonic sealing knife (205), the ultrasonic amplification rod (202) and a pair of ultrasonic amplitude rods (203) are fixed on the ultrasonic mounting plate (204), the ultrasonic mounting plate (204) is vertically arranged with the support mounting plate (4), and is rigidly connected with a pair of sliding blocks (108) and ball screw nuts (109) through screws, one side of the ultrasonic generating device (201) is fixedly connected with one end of the ultrasonic amplification rod (202), a pair of the ultrasonic amplitude rods (203) are arranged on the two sides of the ultrasonic amplification rod (202), and one end of the pair of ultrasonic amplitude rods (203) is connected with the back of the ultrasonic sealing knife (205) through a connecting piece, the back of the ultrasonic sealing knife (205) is chiseled with a shallow groove, and the head of the ultrasonic sealing knife (205) is integrated with a pressure sensor.

5. A wide aperture heavy film ultrasonic self-sealing closure device according to claim 4, wherein, The reconfigurable bottom film module (3) comprises a sheet-shaped bottom film (301), the sheet-shaped bottom film (301) is composed of a plurality of bottom film pieces (302), the tail of the bottom film piece (302) is dovetail-shaped, the outer side of the sheet-shaped bottom film (301) is provided with a bottom film base (306), the bottom film base (306) is chiseled with a second groove, and the inner part of the second groove is respectively embedded with a rubber pad (304) and a support plate (305), a plurality of the bottom film pieces (302) are fixed in the inside of the bottom film base (306) through the extrusion of the rubber pad (304) and the support plate (305), and the plurality of bottom film pieces (302) are arranged and distributed in a close parallel manner in the inside of the bottom film base (306), the side of the sheet-shaped bottom film (301) close to the ultrasonic sealing knife (205) is provided with a plurality of anti-skid convex particles, one side of the bottom film base (306) is respectively threadedly connected with a group of first screws (307) and second screws (308), and the first screws (307) and the second screws (308) are arranged in parallel along the bottom film base (306), one end of the first screws (307) and the second screws (308) is in contact with the side of the support plate (305) away from the rubber pad (304), one side of the bottom film base (306) is respectively provided with a bottom film mounting plate (309) and a plurality of bottom film fixing bolts (3011), and the bottom film base (306) is connected with the bottom film mounting plate (309) through the plurality of bottom film fixing bolts (3011), the edge of the ultrasonic sealing knife (205) is aligned with the side of the sheet-shaped bottom film (301) close to the ultrasonic sealing knife (205), and one side of the bottom film mounting plate (309) is threadedly connected with a plurality of jackscrews (3010), and the jackscrews (3010) are used for adjusting the parallelism of the contact surface of the sheet-shaped bottom film (301) and the ultrasonic sealing knife (205).

6. A wide aperture heavy film ultrasonic self-sealing closure device according to claim 5, wherein, The sheet-shaped bottom film (301) is provided with a bottom film baffle (303) on both sides, and a pair of bottom film baffles (303) are respectively installed on both sides of the bottom film base (306) through screws.

7. A wide aperture heavy film ultrasonic self-sealing closure device according to claim 5, wherein, A pair of round through holes are drilled in the bottom film mounting plate (309), and the bottom film mounting plate (309) is sleeved on the outer wall of a pair of cylindrical guide rails (1010) through the pair of round through holes. The outer wall of the pair of cylindrical guide rails (1010) is processed with shaft shoulders near both ends and is threaded, and the outer wall of the cylindrical guide rail (1010) is threadedly connected with a hexagonal nut near both ends. A pair of cylindrical guide rails (1010) are sleeved with a gasket, and the pair of gaskets are in contact with the bottom film mounting plate (309). One end of the pair of hexagonal nuts on one side is in close contact with the side of the positioning table close to the L-shaped motor mounting plate (103), and one end of the pair of hexagonal nuts on the other side is in close contact with the pair of gaskets, respectively.

8. The control system of a wide-aperture heavy membrane ultrasonic self-adaptive sealing device according to any one of claims 1-7, characterized in that, The inside of the sealing control system is provided with a controller, and the controller internally stores a sealing control program, which is specifically used to realize a sealing work control process, and the sealing work control process includes the following steps: Step one: Set the desired pressure value p of the ultrasonic sealer (205) according to the characteristics of the sealing bag exp ; Step two: according to the expected pressure controller output servo motor (101) current I0, drive the wide caliber ultrasonic sealing module (2) forward; Step three: the ultrasonic sealing knife (205) compresses the bag opening, and the pressure sensor monitors the knife opening pressure p in real time. When the pressure exceeds 1.2p exp , the hardware level power-off protection is triggered; Step four: the PID controller adjusts the servo motor (101) current I in real time according to the pressure sensor reading; Step five: reaching the desired pressure p exp When the desired pressure p is reached, the ultrasonic wave generating device (201) is started to perform the sealing operation. Step six: sealing is completed, and the servo motor (101) is reversed to complete the tool withdrawal action.

9. The control system of a wide aperture heavy membrane ultrasonic self- adaptive sealing device according to claim 8, wherein, According to the servo motor (101) characteristics and mechanics principle to establish the mathematical model of ultrasonic automatic sealing device, adjust the servo motor (101) current I control servo motor (101) output torque T, wherein, k t The motor torque constant: The screw thrust F is represented as: Where η is the transmission efficiency, P is the lead of the screw, Considering the rigidity and transmission structure of the device, the unit area pressure p of the ultrasonic sealing knife (205) blade is: Where A is the blade area.

10. The control system of a wide aperture heavy membrane ultrasonic self- adaptive sealing device according to claim 8, wherein, The expected pressure controller adopts a fuzzy control algorithm, and the PID controller adjusts the output current according to the following formula: where the proportionality coefficient K p , the integral coefficient K i , the differential coefficient K d are respectively adjusted in the range [0.5, 5], [0.01, 1], [0.001, 0.5].

Images