A high frequency heating device

Abstract

The utility model discloses a high frequency heating device in the field of steel drum manufacturing, including the rack of being located above heating station, the rack top sets up lifting drive arrangement, lifting drive arrangement is used for driving rack bar reciprocating movement in vertical direction, the rack bar bottom is provided with lifting plate, lifting plate is connected with upper horizontal board and lower horizontal board respectively through main connection subassembly, upper horizontal board and lower horizontal board center all are provided with the through -hole of steel drum passing, be provided with a plurality of connecting rods that are annular and equally spaced distribution outside the through -hole between upper horizontal board and lower horizontal board, a plurality of connecting rod outer circumferences are wound from below to above multilayer induction coil, induction coil is provided with the through -hole coaxial and is connected with heating control box electrically, heating control box is used for starting and stopping induction coil, adjusts the heating power and heating time of induction coil. The utility model has the advantages of small floor space, low in cost and high heating efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of steel drum manufacturing technology, and specifically relates to a high-frequency heating device. Background Technology

[0002] As a crucial process in the metal packaging industry, screen printing on steel drums directly impacts the adhesion, weather resistance, and packaging safety of the printed pattern through ink curing. Therefore, a stable heating method is essential to ensure curing quality. Currently, the industry commonly uses hot air circulating ovens for ink curing. These ovens uniformly heat the steel drums through a hot air circulation system, ensuring consistent heating temperature and time for each drum in mass production, meeting basic curing requirements. However, this traditional solution has several drawbacks: First, the oven itself has high installation costs, requires significant space, and necessitates complex connections with the production line, potentially disrupting the production process. Second, hot air curing requires a combustion engine and natural gas supply system, resulting in high natural gas consumption and low energy efficiency (due to substantial heat loss during hot air circulation), significantly increasing production costs. Utility Model Content

[0003] The purpose of this invention is to provide a high-frequency heating device that has the advantages of small footprint, low cost and high heating efficiency.

[0004] The purpose of this utility model is achieved as follows: A high-frequency heating device includes a frame located above the heating station. A lifting drive device is provided on the top of the frame. The lifting drive device is used to drive a rack to reciprocate in the vertical direction. A lifting plate is provided at the bottom of the rack. The lifting plate is connected to an upper horizontal plate and a lower horizontal plate respectively through a main connecting assembly. A through hole for a steel barrel to pass through is opened at the center of both the upper and lower horizontal plates. A plurality of connecting rods are arranged in a ring at equal intervals on the outside of the through hole between the upper and lower horizontal plates. Multiple layers of induction coils are wound around the outer periphery of the plurality of connecting rods from bottom to top. The induction coils are coaxially arranged with the through hole and electrically connected to a heating control box. The heating control box is used to start and stop the induction coils and adjust the heating power and heating time of the induction coils.

[0005] In use, the steel drum to be heated is transported to the heating station, aligning it with the through-hole on the same vertical axis. The lifting drive is activated, using a rack and pinion mechanism to lower the lifting plate and multi-layer induction coils vertically until the induction coils are positioned on the outside of the ink on the steel drum. The heating control box integrates a drive module with rectifier, filter, and inverter circuits. The rectifier circuit converts AC to DC, and the filter and inverter circuits convert the DC to high-frequency AC. This high-frequency AC is then applied to the induction coils, generating a high-frequency alternating magnetic field. This magnetic field induces eddy currents on the surface of the steel drum, heating it using the thermal effect of the eddy currents. During heating, the control box can adjust the coil power and time according to process requirements. After the ink has cured, the lifting drive mechanism moves the rack upwards, causing the lifting plate and multi-layer induction coils to rise and reset vertically.

[0006] Compared with existing technologies, the advantages of this utility model are as follows: This device can be used independently or integrated with existing conveyor lines. It adopts a modular frame and lifting drive structure, requiring only the installation of the frame above the heating station. Deployment is completed by adjusting the coil position via a rack-and-pinion driven lifting plate. No additional long-distance conveyor chains or complex pipelines are needed, resulting in a small footprint and effectively solving the problem of excessively large installation space required for ovens. It is also easy to connect to production lines. Only an initial investment in a high-frequency heating device is needed, significantly reducing costs compared to ovens. It consumes no natural gas, only electricity. The multi-layer coaxial coils can precisely match the shape of the steel drum, reducing ineffective heating areas and further lowering energy consumption. The overall structure of the device is simple, easy to maintain, and has a lower failure rate compared to ovens. Compared to traditional ovens that require approximately ten minutes of high-temperature baking to cure the ink, this device can heat a steel drum in just about 4 seconds, significantly improving production efficiency.

[0007] As a further improvement of this utility model, the lifting drive device includes a geared motor, and a gear is coaxially arranged at the output end of the geared motor. The gear meshes with a rack for transmission. The rack is slidably connected to a vertical track through a slider. The vertical track is fixedly connected to a mounting base.

[0008] As a further improvement of this utility model, the main connecting assembly includes four uprights arranged in a rectangular pattern. The top of each upright is fixedly connected to the lifting plate by fasteners, the middle and lower parts are fixedly connected to the upper horizontal plate by fasteners, and the bottom is fixedly connected to the lower horizontal plate by fasteners.

[0009] As a further improvement of this utility model, a secondary connecting assembly is also provided between the upper horizontal plate and the lower horizontal plate. The secondary connecting assembly is located between the connecting rod and the main connecting assembly and includes four support rods distributed in a rectangular shape. The top of the support rods is fixedly connected to the upper horizontal plate by fasteners, and the bottom is fixedly connected to the lower horizontal plate by fasteners.

[0010] As a further improvement of this utility model, the frame includes four rectangular columns, with a top plate at the top of the four columns. An upper crossbeam, a lower crossbeam, and a protective net are provided between the two columns on the left side, and an upper crossbeam, a lower crossbeam, and a protective net are provided between the two columns on the right side. The lifting drive device is located on the top plate.

[0011] As a further improvement of this utility model, the bottom of the frame is provided with a first barrel-blocking mechanism, a barrel detection mechanism, and a second barrel-blocking mechanism in sequence along the barrel conveying direction. When the barrel detection mechanism detects that the barrel has entered the heating station, the first barrel-blocking mechanism performs a barrel-blocking action to ensure that the barrel at the heating station and the induction coil are on the same vertical axis. The second barrel-blocking mechanism performs a barrel-blocking action to ensure that the next adjacent barrel is outside the heating station. After the barrel is heated, the first barrel-blocking mechanism and the second barrel-blocking mechanism perform a barrel-releasing action.

[0012] As a further improvement of this utility model, both the first and second barrel-blocking mechanisms include two symmetrically distributed three-axis cylinders. The cylinder body of the three-axis cylinder is fixed on the frame by a bracket. A nylon block is provided at the end of the piston rod of the three-axis cylinder, and the outward side of the nylon block is tangent to the outer periphery of the steel barrel.

[0013] As a further improvement of this utility model, the steel drum detection mechanism includes a photoelectric switch and a reflector arranged opposite to each other. The photoelectric switch is fixed to the right side of the frame by a bracket, and the reflector is fixed to the left side of the frame by a bracket.

[0014] As a further improvement of this utility model, the frame is provided with a starting point proximity switch, an ending point proximity switch and a limit proximity switch from top to bottom in the same vertical direction, and a metal sensing plate is provided on the side of the lifting plate. Attached Figure Description

[0015] Figure 1 This is the front view of the present invention.

[0016] Figure 2 for Figure 1 Sectional view at point AA.

[0017] Figure 3 This is a top view of the steel drum when it is located in the heating station.

[0018] Figure 4 This is a top view of the lifting drive device of this utility model.

[0019] The components include: 1. Frame, 101. Column, 102. Top plate, 103. Lower crossbeam, 104. Protective net, 105. Intermediate column, 2. Rack, 3. Lifting plate, 4. Upper horizontal plate, 5. Lower horizontal plate, 6. Through hole, 7. Connecting rod, 8. Induction coil, 9. Heating control box, 10. Gear motor, 11. Gear, 12. Vertical rail, 13. Mounting base, 14. Upright pole, 15. Slider, 16. Support rod, 17. Starting point proximity switch, 18. End point proximity switch, 19. Limit proximity switch, 20. Metal induction plate, 21. Existing conveyor line, 22. First stop mechanism, 23. Second stop mechanism, 24. Three-axis cylinder, 25. Bracket, 26. Nylon block, 27. Photoelectric switch, 28. Reflector, 29. Fastener, 30. Steel drum. Detailed Implementation

[0020] like Figure 1-4 As shown, a high-frequency heating device includes a frame 1 located above the heating station; a lifting drive device is provided on the top of the frame 1, which is used to drive a rack 2 to reciprocate in the vertical direction. The rack 2 is preferably made of aluminum alloy and has a lifting plate 3 welded to its bottom. The lifting plate 3 is connected to an upper horizontal plate 4 and a lower horizontal plate 5 of a square structure through a main connecting component. Both the upper horizontal plate 4 and the lower horizontal plate 5 have through holes 6 at their centers to allow a steel barrel 30 to pass through. Multiple connecting rods 7 are arranged in a ring and evenly spaced outside the through holes 6 between the upper horizontal plate 4 and the lower horizontal plate 5. Multiple layers of induction coils 8 are wound around the outer periphery of the multiple connecting rods 7 from bottom to top. The induction coils 8 are coaxially arranged with the through holes 6 and electrically connected to a heating control box 9. The heating control box 9 is used to start and stop the induction coils 8 and adjust the heating power and heating time of the induction coils 8.

[0021] In this embodiment, the lifting drive device includes a 3KW geared motor 10 with a braking function. A gear 11 is coaxially arranged at the output end of the geared motor 10. The gear 11 meshes with the rack 2 for transmission. The rack 2 is slidably connected to one side of the vertical rail 12 through a slider 15. The other side of the vertical rail 12 is fixedly connected to the mounting base 13. The 3KW geared motor 10 amplifies the output torque through the reduction ratio, which can provide strong power at low speed to ensure the smooth lifting of the lifting plate 3 and the coil assembly.

[0022] The main connecting assembly includes four rectangular uprights 14. The top of each upright 14 is fixedly connected to the lifting plate 3 via fasteners 29, the middle and lower parts are fixedly connected to the upper horizontal plate 4 via fasteners 29, and the bottom is fixedly connected to the lower horizontal plate 5 via fasteners 29. A secondary connecting assembly is also provided between the upper horizontal plate 4 and the lower horizontal plate 5. The secondary connecting assembly is located between the connecting rod 7 and the main connecting assembly and includes four rectangular support rods 16. The top of each support rod 16 is fixedly connected to the upper horizontal plate 4 via fasteners 29, and the bottom is fixedly connected to the lower horizontal plate 5 via fasteners 29. Both the main and secondary connecting assemblies are rectangularly distributed, forming a "main-secondary" double-layer support system. This improves the overall rigidity of the structure, effectively suppresses deformation of the horizontal plate caused by uneven load or driving impact during lifting, and ensures the coaxiality of the coil and the steel drum 30.

[0023] The frame 1 includes four rectangular columns 101. A top plate 102 is provided on the upper end of the four columns 101. An upper crossbeam, a lower crossbeam 103 and a protective net 104 are provided between the two columns 101 on the left side. An upper crossbeam, a lower crossbeam 103 and a protective net 104 are provided between the two columns 101 on the right side. The geared motor 10 is fixed to the top plate 102 by a mounting base 13. The protective net 104 is composed of metal mesh, which effectively protects the boundary of the equipment and prevents personal injury caused by personnel accidentally entering the equipment.

[0024] To facilitate the control of the starting point, ending point and limit of the lifting of the induction coil 8, and to prevent the induction coil 8 from slipping and causing damage due to improper operation, the frame 1 also includes a middle column 105. The middle column 105 is provided with a starting point proximity switch 17, an ending point proximity switch 18 and a limit proximity switch 19 in the same vertical direction from top to bottom. A metal induction plate 20 is provided on the side of the lifting plate 3.

[0025] This device can also be used with the existing conveyor line 21. At the bottom of the frame 1, along the conveying direction of the steel drum 30, a first drum blocking mechanism 22, a steel drum detection mechanism, and a second drum blocking mechanism 23 are sequentially arranged. When the steel drum 30 detection mechanism detects that the steel drum 30 has entered the heating station, the first drum blocking mechanism 22 performs a drum blocking action to ensure that the steel drum 30 located at the heating station and the induction coil 8 are on the same vertical axis. The second drum blocking mechanism 23 performs a drum blocking action to ensure that the next adjacent steel drum 30 is outside the heating station. After the steel drum 30 has been heated, the first drum blocking mechanism 22 and the second drum blocking mechanism 23 perform a drum releasing action.

[0026] Specifically, both the first stop mechanism 22 and the second stop mechanism 23 include two symmetrically distributed triaxial cylinders 24. The cylinder body of the triaxial cylinder 24 is fixed to the upper side of the lower crossbeam 103 by a bracket 25. A nylon block 26 is provided at the end of the piston rod of the triaxial cylinder 24, and the outward side of the nylon block 26 is tangentially arranged with the outer periphery of the steel barrel 30. This device controls the flow of compressed air to the triaxial cylinder 24 by switching the air passage on and off using a solenoid valve, thereby driving the extension and retraction of its piston rod. The steel barrel 30 detection mechanism includes a photoelectric switch 27 and a reflector 28 arranged opposite to each other. The photoelectric switch 27 is fixed to the lower crossbeam 103 on the right side of the frame 1 by a bracket 25, and the reflector 28 is fixed to the lower crossbeam 103 on the left side of the frame 1 by a bracket 25.

[0027] The aforementioned geared motor 10, heating control box 9, solenoid valve, photoelectric switch 27, starting proximity switch 17, ending proximity switch 18, and limit proximity switch 19 are all electrically connected to the Mitsubishi FX3G-24M programmable controller.

[0028] In use, the steel drum 30 moves towards the heating station via the existing conveyor chain. When the steel drum 30 blocks the light path of the photoelectric switch 27 and the reflector 28, the photoelectric switch 27 sends a signal to the controller. The controller then sends a energizing command to the solenoid valve. The two- and three-axis cylinders 24 of the first drum-blocking mechanism 22 extend synchronously to perform the drum-blocking action. The nylon block 26 at the end of the piston rod makes tangential contact with the outer periphery of the steel drum 30, stopping the steel drum 30 at the heating station. At the same time, the two- and three-axis cylinders 24 of the second drum-blocking mechanism 23 extend synchronously to stop subsequent steel drums 30, preventing them from overlapping into the station. The controller sends a forward rotation command to the reduction motor 10, causing the lifting plate 3 to descend along with the multi-layer induction coil 8 until the metal induction plate 20 triggers the endpoint proximity switch 18. The controller then sends a stop command to the reduction motor 10 and a start command to the heating control box 9, energizing the induction coil 8. Electricity is applied, and after about 4 seconds, the temperature instantly rises to about 180 degrees Celsius, heating the cylinder body. When the set heating time is reached, the controller sends a stop command to the heating control box 9 and a reverse command to the geared motor 10, driving the lifting plate 3 to raise the coil. When the metal induction plate 20 triggers the starting point proximity switch 17, the controller sends a stop command to the geared motor 10 and a power-off command to the solenoid valve. The induction coil 8 returns to its initial high position, and the three-axis cylinders 24 of the first and second barrel-blocking mechanisms 23 retract synchronously. The nylon block 26 moves away from the steel barrel 30, and the heated steel barrel 30 is removed from the original conveyor chain. At the same time, the next steel barrel 30 is transported to the heating station, and the above process is repeated. If an accidental fall occurs during the lifting process, the metal induction plate 20 triggers the ending point proximity switch 18, and the controller sends an alarm signal to remind the staff to come to the scene in time.

[0029] The advantages of this utility model are as follows: This device can quickly adjust the relative position of the induction coil 8 and the steel drum 30 through the lifting drive device, which can adapt to steel drums 30 of different heights and support uniform heating of steel drums 30 of different diameters, thus improving the versatility of the equipment; the multi-layer coil layout coaxial with the steel drum 30 can optimize the uniformity of the magnetic field and the concentration of energy, thereby improving the eddy current heating efficiency and shortening the heating time; the annular connecting rod 7 can stably support the coil, avoid the deformation or displacement of the coil due to uneven force at a single point, ensure the coaxiality of the coil and the steel drum 30, thereby maintaining the stability of the magnetic field distribution, reducing heating deviation, and ensuring the consistency of the heating process.

[0030] This utility model is not limited to the above embodiments. Based on the technical solutions disclosed in this utility model, those skilled in the art can make some substitutions and modifications to some of the technical features without creative labor, and these substitutions and modifications are all within the protection scope of this utility model.

Claims

1. A high-frequency heating device, comprising a frame located above a heating station, characterized in that, A lifting drive device is installed at the top of the frame. The lifting drive device is used to drive the rack to move back and forth in the vertical direction. A lifting plate is installed at the bottom of the rack. The lifting plate is connected to the upper horizontal plate and the lower horizontal plate respectively through the main connecting assembly. A through hole for the steel barrel to pass through is opened at the center of the upper horizontal plate and the lower horizontal plate. Several connecting rods are arranged in a ring and evenly spaced outside the through hole between the upper horizontal plate and the lower horizontal plate. Multiple layers of induction coils are wound around the outer circumference of the connecting rods from bottom to top. The induction coils are coaxially arranged with the through hole and electrically connected to the heating control box. The heating control box is used to start and stop the induction coils and adjust the heating power and heating time of the induction coils.

2. The high-frequency heating device according to claim 1, characterized in that, The lifting drive device includes a geared motor, and a gear is coaxially arranged at the output end of the geared motor. The gear meshes with a rack for transmission. The rack is slidably connected to a vertical track through a slider. The vertical track is fixedly connected to a mounting base.

3. The high-frequency heating device according to claim 1, characterized in that, The main connecting assembly includes four uprights arranged in a rectangular pattern. The top of each upright is fixedly connected to the lifting plate by fasteners, the middle and lower parts are fixedly connected to the upper horizontal plate by fasteners, and the bottom is fixedly connected to the lower horizontal plate by fasteners.

4. The high-frequency heating device according to claim 1, characterized in that, A secondary connecting assembly is also provided between the upper horizontal plate and the lower horizontal plate. The secondary connecting assembly is located between the connecting rod and the main connecting assembly and includes four support rods arranged in a rectangular shape. The top of the support rods is fixedly connected to the upper horizontal plate by fasteners, and the bottom is fixedly connected to the lower horizontal plate by fasteners.

5. The high-frequency heating device according to claim 1, characterized in that, The frame includes four rectangular columns, with a top plate at the top of each column. An upper crossbeam, a lower crossbeam, and a protective net are arranged between the two columns on the left and between the two columns on the right. The lifting drive device is mounted on the top plate.

6. The high-frequency heating device according to claim 1, characterized in that, The bottom of the frame is sequentially equipped with a first drum-blocking mechanism, a drum detection mechanism, and a second drum-blocking mechanism along the drum conveying direction. When the drum detection mechanism detects that a drum has entered the heating station, the first drum-blocking mechanism performs a drum-blocking action to ensure that the drum at the heating station and the induction coil are on the same vertical axis. The second drum-blocking mechanism performs a drum-blocking action to ensure that the next adjacent drum is outside the heating station. After the drum is heated, the first drum-blocking mechanism and the second drum-blocking mechanism perform a drum-releasing action.

7. A high-frequency heating device according to claim 6, characterized in that, Both the first and second barrel-stopping mechanisms include two symmetrically distributed three-axis cylinders. The cylinder bodies of the three-axis cylinders are fixed to the frame by a bracket. A nylon block is provided at the end of the piston rod of the three-axis cylinder, and the outward side of the nylon block is tangent to the outer periphery of the steel barrel.

8. A high-frequency heating device according to claim 6, characterized in that, The steel drum detection mechanism includes a photoelectric switch and a reflector arranged opposite to each other. The photoelectric switch is fixed to the right side of the frame by a bracket, and the reflector is fixed to the left side of the frame by a bracket.

9. A high-frequency heating device according to claim 1, characterized in that, The frame is equipped with a starting proximity switch, an ending proximity switch, and a limit proximity switch from top to bottom in the same vertical direction, and a metal sensing plate is provided on the side of the lifting plate.

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