Contactless power transmission device for heat-sealed packaging, packaging machine

Abstract

The present invention discloses a contactless power transmission device and a packaging machine for heat-sealed packaging, the device comprises a fixed module and a mobile module, the fixed module comprises a fixed magnet and a fixed electrode, the fixed magnet is provided with a primary magnetic field gathering area, the fixed electrode is located in the primary magnetic field gathering area and connected to a power supply end; the mobile module comprises a mobile magnet and a mobile electrode; the mobile magnet is provided with a secondary magnetic field gathering area, which is fixed on a mobile frame of the heat-sealed packaging machine; the mobile electrode is fixed on the mobile frame and is electrically connected to a heating element of the heat-sealed packaging machine; the mobile magnet is located in the primary magnetic field gathering area and moves, and there is a gap between the mobile magnet and the fixed magnet; when the fixed electrode is energized, a closed magnetic field is formed in the space located in the primary magnetic field gathering area and the secondary magnetic field gathering area, and the mobile electrode moves in the closed magnetic field to generate a coupling current. The device of the present invention has low energy consumption, low maintenance cost, high stability and reliability, and does not pollute the production environment.

Description

Technical Field

[0001] The invention relates to the technical field of packaging equipment, in particular to a contactless power transmission device for heat-sealed packaging, and a packaging machine using the contactless power transmission device to transmit power for heat-melt sealed packaging. Background Art

[0002] At present, the transverse sealing of packaging boxes in liquid food filling machines (or "packaging machines") adopts high-frequency electromagnetic heating. Multiple transverse sealing units work continuously and cyclically to seal the sealing area of ​​the packaging box, and a brush device is used to intermittently power each transverse sealing unit at a specific position. Its basic structure is that the primary brush and slide rail are fixed on the fixed frame of the filling machine and connected to the high-frequency power supply. The secondary slider is installed on each moving transverse sealing unit and connected to the high-frequency heating element installed on the same transverse sealing unit through a connecting line. When the filling machine is running, when the slider on a moving transverse sealing unit moves to contact the fixed slide rail area, the high-frequency power supply starts to supply power, and the electric energy is transmitted to the slider through the contact surface between the slide rail and the slider, and then transmitted to the high-frequency heating element by the connecting line to heat the sealing area of ​​the packaging box, so that the hot melt material in the sealing area melts to achieve sealing. When the slider on the moving transverse sealing unit leaves the fixed slide rail area, the high-frequency power supply stops supplying power to the high-frequency heating element, completing a working cycle. This continuous cycle achieves continuous transverse sealing of packaging boxes in the liquid food filling machine.

[0003] The above-mentioned method of transmitting electric energy through the contact between the slider and the slide rail will generate friction and heat, which not only requires the addition of a lubrication system and a cooling system, but also causes wear on the contact surface of the slider and the slide rail, reducing the service life of the slider and the slide rail; due to the limitations of the manufacturing accuracy of the slider and the slide rail and the vibration generated when the two move relative to each other at high speed, the slider and the slide rail will have instantaneous poor contact during electric energy transmission, and a contact arc will be generated on the contact surface, causing erosion of the contact surface of the slider and the slide rail, and may also damage the high-frequency power supply, affecting the stability and service life of the transverse sealing unit; and when electric energy is transmitted between the slider and the slide rail, a large electric energy loss will be generated on the contact surface between the two, causing the slide rail to heat up, thereby affecting the electric energy transmission effect of the brush device, reducing the electric energy transmission efficiency, and increasing the working energy consumption of the transverse sealing unit.

[0004] Based on this, the existing liquid food packaging machine has the following shortcomings in the power transmission method for transverse sealing of packaging boxes: 1. The contact surfaces of the brushes and the slide rails wear out quickly, have a short service life, high maintenance costs, and poor working stability of the power transmission; 2. It is necessary to add a lubrication system and a cooling system, which have a complex structure and are easy to pollute the production environment, and have high manufacturing and use costs; 3. The contact surface of the slider and the slide rail is prone to contact arcing and causing ablation, and the failure rate of the components of the entire high-frequency electromagnetic heating system is high, the service life is short, and the working reliability is poor; 4. The power transmission loss between the slider and the slide rail is large, the slide rail heats up seriously, the power transmission efficiency is low, and the energy consumption of the transverse sealing unit is high. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a contactless power transmission device for heat-sealed packaging, and a packaging machine using the contactless power transmission device. The power transmission device is designed based on the principle of electromagnetic induction, and the power at the power supply end is transferred to the heating element by means of contactless transmission. The stability and reliability of power transmission can be effectively improved, while the service life of the device can be extended, and the maintenance cost of the packaging machine and the production cost of product sealing can be reduced.

[0006] In order to solve the above technical problems, the present invention provides a contactless power transmission device for heat-sealed packaging, comprising:

[0007] A fixed module, comprising a fixed magnet and a fixed electrode, wherein the fixed magnet is provided with a primary magnetic field gathering area, and the fixed electrode is located in the primary magnetic field gathering area and connected to a power supply end;

[0008] A moving module, comprising a moving magnet and a moving electrode; the moving magnet is provided with a secondary magnetic field gathering area and is fixed on a moving frame of a heat sealing packaging machine; the moving electrode is fixed on the moving frame and is electrically connected to a heating element of the heat sealing packaging machine;

[0009] The movable magnet moves in the primary magnetic field concentration area and has a gap between it and the fixed magnet; when the fixed electrode is energized, a closed magnetic field is formed in the space between the primary magnetic field concentration area and the secondary magnetic field concentration area, and the movable electrode moves in the closed magnetic field to generate a coupling current.

[0010] In a preferred embodiment of the present invention, the fixed magnet further includes a fixed magnetic core, the fixed magnetic core is provided with a middle groove separated by a convex part, and two side grooves respectively located on both sides of the middle groove, the middle groove and the side grooves form the primary magnetic field gathering area.

[0011] In a preferred embodiment of the present invention, the fixed electrode further includes first and second electrode arms and a connector, the connector connects one end of the first and second electrode arms, and the other ends of the first and second electrode arms are used to connect to the power supply end; the first and second electrode arms are respectively arranged in the grooves on both sides.

[0012] In a preferred embodiment of the present invention, parts of the first and second electrode arms extend into the secondary magnetic field concentration region.

[0013] In a preferred embodiment of the present invention, the movable magnet further comprises a movable magnetic core, and the movable magnetic core is provided with a first groove and a second groove separated by a boss; the first groove and the second groove form the secondary magnetic field gathering area.

[0014] In a preferred embodiment of the present invention, the movable electrode further includes a first and a second electrode plate and a connecting head, the connecting head is connected to one end of the first and the second electrode plates, the other end of the first and the second electrode plates are used to connect the heating element, and an annular groove is provided in the connecting head; the annular groove is sleeved on the outer side of the boss, and is partially located in the first groove and partially located in the second groove.

[0015] In a preferred embodiment of the present invention, an insulating portion is further provided between the first and second electrode plates.

[0016] In a preferred embodiment of the present invention, the movable magnetic core is further inserted into the primary magnetic field gathering area, the fixed magnetic core is inserted into the secondary magnetic field gathering area, and there is an end face gap and a side face gap between the movable magnetic core and the fixed magnetic core.

[0017] In a preferred embodiment of the present invention, the boss of the movable magnetic core is further inserted into the middle groove, and its side portions located on both sides of the boss are respectively inserted into the side grooves; the convex portion of the fixed magnetic core is inserted into the first groove and the second groove; there is an end face gap and a side face gap between the side groove; there is an end face gap and a side face gap between the boss and the middle groove; there is an end face gap and a side face gap between the convex portion and the first groove and the second groove.

[0018] In order to solve the above technical problems, the present invention also provides a heat-sealing packaging machine, including a power supply and a heater. The packaging machine uses the contactless power transmission device to transmit the power of the power supply to the heater, and uses the heater to hot-melt seal the package.

[0019] Beneficial effects of the present invention:

[0020] The contactless power transmission device of the present invention, and the packaging machine using the contactless power transmission device, adopt the electromagnetic induction principle to design the power transmission device, and transfer the electric energy from the power supply end to the heating element by means of contactless transmission, which can effectively improve the stability and reliability of power transmission, while extending the service life of the device, reducing the maintenance cost of the packaging machine and the production cost of product sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural diagram of a contactless power transmission device in a preferred embodiment of the present invention;

[0022] Figure 2 It is a schematic diagram of the structure of the initial state of operation of the contactless power transmission device;

[0023] Figure 3 It is a schematic diagram of the structure of a contactless power transmission device operating in one cycle;

[0024] Figure 4 yes Figure 2 A top view of

[0025] Figure 5 yes Figure 4 A partial enlarged view of position A shown;

[0026] Figure 6 is a schematic structural diagram of a fixed magnet in a preferred embodiment of the present invention;

[0027] Figure 7 is a schematic structural diagram of a moving magnet in a preferred embodiment of the present invention;

[0028] Figure 8 is a schematic diagram of the structure of the fixed electrode in a preferred embodiment of the present invention;

[0029] Fig. 9 It is a schematic diagram of the structure of the movable electrode in a preferred embodiment of the present invention.

[0030] Description of the numbers in the figure:

[0031] 1-fixed magnet, 11-fixed magnetic core, 12-convex part, 13-middle groove, 14-side groove;

[0032] 2-moving magnet, 21-moving magnetic core, 22-boss, 23-first groove, 24-second groove;

[0033] 3-fixed electrode, 31-positive electrode arm, 32-negative electrode arm, 33-connector;

[0034] 4-movable electrode, 41-positive electrode plate, 42-negative electrode plate, 43-connector, 44-annular groove, 45-insulating part;

[0035] 5-movable frame, 6-heating element, 7-fixed frame, 8-end face gap, 9-side gap, 10-closed magnetic field. DETAILED DESCRIPTION

[0036] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0037] Embodiment 1

[0038] This embodiment discloses a contactless power transmission device, which is used to transmit power from a power source to a load through a contactless transmission method. In one embodiment, the device is used to transmit power in a hot melt sealing packaging machine, referring to Figures 1 to 5 As shown, the device includes a fixed module and a movable module, the fixed module includes a fixed magnet 1 and a fixed electrode 3, the fixed magnet 1 is provided with a primary magnetic field gathering area, the fixed electrode 3 is located in the primary magnetic field gathering area and is connected to the power supply end; the movable module includes a movable magnet 2 and a movable electrode 4; the movable magnet 2 is provided with a secondary magnetic field gathering area, the movable magnet 2 is fixed on a movable frame 5 of a heat sealing packaging machine; the movable electrode 4 is fixed on the movable frame 5 and is electrically connected to a heating element 6 of the heat sealing packaging machine; the movable magnet 2 is located in the primary magnetic field gathering area and moves, and there is a gap between it and the fixed magnet 1.

[0039] Reference Figure 1 The heating element 6 is installed on the movable frame 5 in a transversely extending manner, the movable magnet 2 is fixed near the end of the movable frame 5, the movable electrode 4 is fixedly connected to the heating element 6, and the two are electrically connected after being fixedly connected. The fixed magnet 1 is installed on the fixed frame 7, and the fixed magnet 1 is extended longitudinally as a whole. Figure 2 As shown, when the transmission device is in the initial state of operation, the moving frame 5 is located at one end of the longitudinal extension of the fixed magnet 1. Figure 3 As shown, when the device is running, the moving frame 5 moves toward the other end of the fixed magnet 1 under the action of external force, thereby driving the moving magnet 2 and the moving electrode 3 to move. During the operation, the fixed electrode 3 is energized, and a magnetic field is generated around the fixed electrode 3 when energized. The above-mentioned primary magnetic field gathering area and secondary magnetic field gathering area are used to gather and guide the magnetic field to form a closed magnetic field 10. During the movement of the mobile electrode 4, the magnetic lines of force of the closed magnetic field 10 are cut to generate coupling current, and the electric energy is transferred to the heating element 6 conductively connected to the mobile electrode 4. In this way, the electric energy transmission device is designed using the principle of electromagnetic induction, and the electric energy connected to the power supply end through the fixed electrode 3 is transferred to the heating element 6 by means of contactless transmission.

[0040] Specifically, refer to Figure 6As shown, the fixed magnet 1 is an integral or combined structure made of soft magnetic material, which includes a fixed magnetic core 11, on which is provided a middle groove 13 separated by a convex portion 12, and side grooves 14 respectively located on both sides of the middle groove 13, the middle groove 13 and the side grooves 14 form the primary magnetic field gathering area.

[0041] Reference Figure 7 As shown, the movable magnet 2 is an integral or combined structure made of soft magnetic material, which includes a movable magnetic core 21, on which a first groove 23 and a second groove 24 separated by a boss 22 are provided; the first groove 23 and the second groove 24 form the secondary magnetic field gathering area.

[0042] Reference Figure 8 As shown, the fixed electrode 3 is an integral or combined structure made of a conductive material, which includes the first and second electrode arms 31, 32 and a connector 33. The connector 33 connects one end of the first and second electrode arms 31, 32, and the other end of the first and second electrode arms 31, 32 is used to connect to the power supply end. The first and second electrode arms 31, 32 are respectively arranged in the grooves on both sides. When the first and second electrode arms 31, 32 are energized, a magnetic field is generated around them. Among them, parts of the first and second electrode arms 31, 32 extend into the secondary magnetic field gathering area, reducing the distance between the first and second electrode arms 31, 32 and the secondary magnetic field gathering area, and improving the magnetic field gathering effect.

[0043] Reference Fig. 9 As shown, the movable electrode 4 is an integral or combined structure made of a conductive material, which includes a first and a second electrode plate 41, 42 and a connecting head 43. An insulating portion 45 is provided between the first and the second electrode plates 41, 42. The connecting head 43 connects one end of the first and the second electrode plates 41, 42. The other ends of the first and the second electrode plates 41, 42 are used to connect the heating element 6. An annular groove 44 is provided in the connecting head 43. The annular groove 44 is sleeved on the outer side of the boss 22, and is partially located in the first groove 23 and partially located in the second groove 24.

[0044] In the technical solution of this embodiment, the moving magnetic core 2 maintains a gap with the fixed magnetic core 1 throughout the entire cycle, wherein the moving magnetic core 21 is inserted into the primary magnetic field gathering area, the fixed magnetic core 11 is inserted into the secondary magnetic field gathering area, and there is an end face gap 8 and a side face gap 9 between the moving magnetic core 21 and the fixed magnetic core 11. Specifically, the boss 22 of the moving magnetic core 21 is inserted into the middle groove 13, and its edges located on both sides of the boss 22 are respectively inserted into the two side grooves 14; the convex portion 12 of the fixed magnetic core 11 is inserted into the first groove 23 and the second groove 24; there is an end face gap 8 and a side face gap 9 between the edge and the side groove 14; there is an end face gap 8 and a side face gap 9 between the boss 22 and the middle groove 13; there is an end face gap 8 and a side face gap 9 between the convex portion 12 and the first groove 23 and the second groove 24.

[0045] As described above, in the technical solution of this embodiment, the optimized structure of the fixed magnet 1, the movable magnet 2, the fixed electrode 3 and the movable electrode 4 has the technical advantages of simple structural design, easy production and high consistency while realizing contactless transmission of electric energy.

[0046] Compared with the contact-type power transmission in the prior art, the contactless power transmission device of the present invention has the following technical advantages:

[0047] 1. The contactless power transmission device adopts the electromagnetic induction power transmission method without increasing the manufacturing difficulty, manufacturing cost and use cost, creatively solving many defects and shortcomings of the power transmission method in the existing high-speed filling machine.

[0048] 2. There is no mechanical contact between the moving magnet and the fixed magnet of the contactless power transmission device, and no friction is generated, which effectively solves the technical problem of wear on the contact surface of the slider and the slide rail in the prior art. The device is wear-free, maintenance-free, has low maintenance costs and high stability.

[0049] 3. The contactless power transmission device relies on the principle of electromagnetic induction to achieve contactless power transmission, effectively solving the technical problem of contact arcing and ablation on the surface of the slider and the rail in the prior art. The service life of the components is longer and the high-frequency electromagnetic heating system works more reliably.

[0050] 4. The contactless power transmission device effectively solves the abnormal power loss at the contact surface between the slider and the slide rail in the prior art, and has high power transmission efficiency and low energy consumption.

[0051] 5. The components in the contactless power transmission device are simple in structure, easy to manufacture, and highly consistent. They do not require a cooling system or a lubrication system, do not pollute the production environment, and have low manufacturing and use costs.

[0052] 6. The contactless power transmission device has no contact between the moving magnet and the fixed magnet, is wear-free, maintenance-free, has high power transmission efficiency, and high working reliability. It is more suitable for power transmission at the transverse sealing of packaging boxes in high-speed filling machines.

[0053] Embodiment 2

[0054] This embodiment discloses a heat-sealing packaging machine, comprising a power supply, a heater and the contactless power transmission device in embodiment one. The packaging machine uses the contactless power transmission device to transmit the power of the power supply to the heater, and uses the heater to perform hot-melt sealing packaging.

[0055] The packaging machine in the technical solution of this embodiment has the following technical advantages compared to the packaging machines in the prior art: low use and maintenance cost, high stability, high reliability, and no pollution to the production environment.

[0056] The above-described embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or changes made by those skilled in the art based on the present invention are within the protection scope of the present invention. The protection scope of the present invention shall be subject to the claims.

Claims

1. A contactless power transmission device for heat-sealed packaging, characterized in that: include, A fixed module, comprising a fixed magnet and a fixed electrode, wherein the fixed magnet is provided with a primary magnetic field gathering area, and the fixed electrode is located in the primary magnetic field gathering area and connected to a power supply end; A moving module, comprising a moving magnet and a moving electrode; the moving magnet is provided with a secondary magnetic field gathering area and is fixed on a moving frame of a heat sealing packaging machine; the moving electrode is fixed on the moving frame and is electrically connected to a heating element of the heat sealing packaging machine; The movable magnet is located in the primary magnetic field concentration area and moves, and there is a gap between the movable magnet and the fixed magnet; when the fixed electrode is energized, a closed magnetic field is formed in the space between the primary magnetic field concentration area and the secondary magnetic field concentration area, and the movable electrode moves in the closed magnetic field to generate a coupling current; The fixed magnet comprises a fixed magnetic core, the fixed magnetic core is provided with a middle groove separated by a convex part, and two side grooves respectively located on both sides of the middle groove, the middle groove and the side grooves form the primary magnetic field gathering area; The fixed electrode comprises a first electrode arm, a second electrode arm and a connector, the connector connects one end of the first electrode arm and the second electrode arm, and the other end of the first electrode arm and the second electrode arm is used to connect to the power supply end; the first electrode arm and the second electrode arm are respectively arranged in the grooves on the two sides; The moving magnet comprises a moving magnetic core, on which a first groove and a second groove separated by a boss are provided; the first groove and the second groove form the secondary magnetic field gathering area; The movable electrode includes a first electrode plate, a second electrode plate and a connecting head, wherein the connecting head is connected to one end of the first electrode plate and the second electrode plate, and the other end of the first electrode plate and the second electrode plate are used to connect the heating element, and an annular through groove is provided in the connecting head; the annular through groove is sleeved on the outer side of the boss, and is partially located in the first groove and partially located in the second groove.

2. The contactless power transmission device for heat-sealed packaging according to claim 1, characterized in that: Parts of the first and second electrode arms extend into the secondary magnetic field concentration area.

3. The contactless power transmission device for heat-sealed packaging according to claim 1, characterized in that: An insulating portion is provided between the first and second electrode plates.

4. The contactless power transmission device for heat-sealed packaging according to claim 1, characterized in that: The movable magnetic core is inserted into the primary magnetic field gathering area, the fixed magnetic core is inserted into the secondary magnetic field gathering area, and there is an end face gap and a side face gap between the movable magnetic core and the fixed magnetic core.

5. The contactless power transmission device for heat-sealed packaging according to claim 4, characterized in that: The boss of the movable magnetic core is inserted into the middle groove, and its sides located on both sides of the boss are respectively inserted into the two side grooves; the convex part of the fixed magnetic core is inserted into the first groove and the second groove; there is an end face gap and a side face gap between the side groove; there is an end face gap and a side face gap between the boss and the middle groove; there is an end face gap and a side face gap between the convex part and the first groove and the second groove.

6. A heat-sealing packaging machine, comprising a power supply and a heater, characterized in that: The packaging machine uses the contactless power transmission device as described in any one of claims 1 to 5 to transmit the power of the power source to the heater, and uses the heater to heat-melt seal the package.

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