Hot melt machine for plastic processing

Abstract

This invention relates to the field of plastic processing equipment technology, and more particularly to a hot melt machine for plastic processing. The technical solution includes: a dotted hot melt device installed inside the worktable; the dotted hot melt device comprises several shells located within a circular outer shell; each shell includes fan-shaped support plates, forming a working chamber between the fan-shaped support plates; the shell is filled with magnetorheological fluid; a piston is provided in the shell; electromagnetic coils are installed around the several shells within the circular outer shell; several evenly distributed conductive elements communicating with the shells are installed within the fan-shaped support plates; movable columnar heating elements are provided within the conductive elements; each columnar heating element includes a piston rod and a heat insulation cylinder; a ceramic heating tube is installed within the heat insulation cylinder; and a heating plate facing the working chamber is installed on the ceramic heating tube. This invention allows each columnar heating element to contact the irregular workpiece and its heating end, thus enabling the numerous dotted columnar heating elements to wrap around the workpiece, solving the problem of not being able to fully conform to complex contours.

Description

Technical Field

[0001] This invention relates to the field of plastic processing equipment technology, and more particularly to a hot melt machine for plastic processing. Background Technology

[0002] In the plastics processing industry, heating and processing irregularly shaped workpieces has always presented numerous challenges. Traditional flat heating plates, due to their fixed shape, cannot fully conform to the complex contours of irregularly shaped workpieces (such as deep grooves or multi-protrusion structures), resulting in insufficient or excessive heating of certain areas. This leads to quality problems such as carbonization and incomplete melting at the weld surface, severely impacting product yield and performance.

[0003] Although some improvements have emerged in existing technologies, such as segmented heating plates and flexible heating films, segmented heating plates are essentially still planar partitions and cannot solve the problem of fitting three-dimensional contours. While flexible heating films can fit curved surfaces to a certain extent, they have poor high-temperature resistance and cannot effectively heat complex concave structures, making it difficult to meet the high-precision and high-quality processing requirements of irregular and shaped workpieces. Summary of the Invention

[0004] The purpose of this invention is to provide a multi-column heating rod combination heating device for irregularly shaped workpieces. Through the combination and adjustable design of the multi-column heating rods, it can achieve contour-fitting heating of irregularly shaped workpieces, solving the problems of uneven heating and inability to adapt to complex contours in traditional heating methods, thereby improving the processing quality and production efficiency of workpieces.

[0005] The technical solution of the present invention: a hot melt machine for plastic processing, including a dotted hot melt device installed in the worktable;

[0006] The point-like hot melting device includes several shells, which are located inside a circular outer shell. Each shell includes a fan-shaped support plate, and the working chamber is formed between the fan-shaped support plates. The shell is filled with magnetorheological fluid, and the shell is equipped with a piston. An electromagnetic coil is installed inside the circular outer shell and arranged around the shells.

[0007] The fan-shaped support plate is equipped with several evenly distributed conductive components that communicate with the shell, and the conductive components are equipped with movable columnar heating elements.

[0008] The cylindrical heating element includes a piston rod and a heat insulation cylinder. A ceramic heating tube is installed inside the heat insulation cylinder, and a heating plate facing the working chamber is installed on the ceramic heating tube. A control unit integrated base is also installed inside the heat insulation cylinder.

[0009] Preferably, the conductive component includes a flow divider near the housing and a displacement cylinder near the working chamber, the piston rod is located inside the flow divider, the heat insulation cylinder is located inside the displacement cylinder, a sealing kit is provided between the flow divider and the displacement cylinder, and a magnetic shielding shell is provided outside the circular outer shell.

[0010] Preferably, a scanning device is fixedly installed on the worktable. The scanning device includes a scanning frame and a scanning channel within the scanning frame. A laser scanner is installed on the side of the scanning channel within the scanning frame. A thickness gauge is installed in the scanning channel. A control device is installed on the side of the worktable. The thickness gauge, the laser scanner, and the control device are electrically connected.

[0011] Preferably, the control unit integration base includes a temperature sensor and a controller. Both the control unit integration base and the ceramic heating tube are electrically connected to the control device. An electric cylinder with a push end and a piston fixedly connected is installed on the worktable.

[0012] Preferably, an inlet platform is provided above the workbench, and a positioning platform is provided below the workbench. The inlet platform includes an inlet frame, and the positioning platform includes a positioning frame.

[0013] Preferably, multiple hydraulic cylinders are fixed between the worktable and the guide table, and a connecting rod is fixedly installed between the piston and the guide table.

[0014] Compared with existing technologies, the beneficial effects of this invention are:

[0015] 1. This invention uses a point-like hot-melting device composed of multiple shells, and injects magnetorheological fluid into the shells. Several conductive elements are installed in the fan-shaped support plate, and columnar heating elements are provided in the conductive elements. By pushing the movement of each columnar heating element with magnetorheological fluid, each columnar heating element can contact the irregular workpiece and the heating end. Thus, the workpiece can be wrapped by the heating plate through the large number of point-like distributed columnar heating elements, which solves the problem of not being able to fully fit the complex contour.

[0016] 2. By using magnetorheological fluid, this invention allows for stable and controllable movement of the columnar heating element, preventing overheating and damage to the workpiece's heating end. When the piston moves into the housing, it pushes the columnar heating element, causing the heating plate to contact the workpiece. Upon contact, the electromagnetic coil is energized, generating magnetic force within the liquid chamber. This magnetic force causes the magnetorheological fluid to solidify. The solidified magnetorheological fluid stabilizes the thrust on the columnar heating element, preventing it from continuing to push the element and thus avoiding further heating of the workpiece, thereby improving the quality of the hot melt. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention;

[0018] Figure 2 This is a schematic diagram of the structure of the dot-shaped hot-melting device of the present invention;

[0019] Figure 3 for Figure 2 A schematic diagram of a partial cross-sectional structure;

[0020] Figure 4 This is a schematic diagram of the columnar heating element of the present invention;

[0021] Figure 5 This is a schematic diagram of the installation structure of the columnar heating element of the present invention;

[0022] Figure 6 This is a schematic diagram of the scanning device of the present invention;

[0023] Figure 7 This is a schematic diagram of another embodiment of the present invention.

[0024] Reference numerals: 1. Workbench; 2. Inlet stage; 3. Positioning stage; 4. Point-shaped hot melt device; 5. Columnar heating element; 6. Scanning device; 7. Control device; 8. Electric cylinder; 9. Hydraulic cylinder; 10. Connecting rod; 21. Inlet frame; 31. Positioning frame; 41. Housing; 42. Circular outer shell; 43. Fan-shaped support plate; 44. Piston; 45. Conductor; 451. Diverter cylinder; 452. Displacement cylinder; 51. Piston rod; 52. Heat insulation cylinder; 53. Ceramic heating tube; 54. Heating plate; 55. Control component integrated base; 61. Scanning frame; 62. Scanning channel; 63. Laser scanner; 64. Thickness gauge; 100. Electromagnetic coil; 200. Magnetic shielding outer shell; 300. Work chamber. Detailed Implementation

[0025] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0026] Example 1

[0027] See attached document Figure 1-6 A hot melt machine for plastic processing, including a worktable 1 with a dotted hot melt device 4 installed inside;

[0028] The point-like hot melting device 4 includes several housings 41, which are located inside a circular outer shell 42. Each housing 41 includes a fan-shaped support plate 43, and a working chamber 300 is formed between the fan-shaped support plates 43. The housing 41 is filled with magnetorheological fluid, and a piston 44 is provided in the housing 41. An electromagnetic coil 100 is installed inside the circular outer shell 42 and arranged around the several housings 41.

[0029] A number of evenly distributed conductive elements 45 connected to the housing 41 are installed inside the fan-shaped support plate 43. A movable columnar heating element 5 is provided inside the conductive element 45.

[0030] The columnar heating element 5 includes a piston rod 51 and a heat insulation cylinder 52. A ceramic heating tube 53 is installed inside the heat insulation cylinder 52. A heating plate 54 facing the working chamber 300 is installed on the ceramic heating tube 53. A control component integrated seat 55 is also installed inside the heat insulation cylinder 52.

[0031] When processing irregularly shaped workpieces, traditional flat heating plates, due to their fixed shape, cannot fully conform to the complex contours of the workpieces, resulting in insufficient or excessive heating in certain areas.

[0032] In this invention, a working chamber 300 is formed by several fan-shaped support plates 43. When the heated end of the workpiece enters the working chamber 300, the piston 44 moves into the housing 41, causing the magnetorheological fluid to be squeezed into several conductive parts 45. The magnetorheological fluid can push the piston rod 51 to move towards the working chamber 300, thus causing the piston rod 51 to push the heat insulation cylinder 52 to move, so that the heating plate 54 can contact the heated end of the workpiece.

[0033] By using a large number of point-distributed heating plates 54, and because each heating plate 54, after contacting the heating end of the workpiece, will be tightly attached to a part of the workpiece due to the hydraulic pressure of the magnetorheological fluid, the setting of the columnar heating element 5 achieves the effect of complete contact with irregular areas. In addition, the large number of point-distributed heating plates 54 can wrap around the heating end of the irregular workpiece, so that the irregular areas can all contact the heating plate 54 equally, solving the problem of not being able to fully fit the complex contour.

[0034] Subsequently, by activating the ceramic heating tube 53, the heating plate 54 is heated, thus heating the workpiece. This ensures that every part of the irregular workpiece receives heat with the same power, preventing localized underheating or overheating of the workpiece and improving the effect and quality of hot melting.

[0035] It should also be noted that by injecting magnetorheological fluid into the housing 41, the problem of overheating damaging the heating end of the workpiece can be prevented. For example, when a workpiece with a wall thickness of 10mm is heated, a thickness of 5mm is required for heat melting to connect it to an external workpiece. However, in the existing method of using hydraulic oil to push, because the pressure is always present, after the heat melting reaches 5mm, the pressure will continue to push the heating plate 54 to move a part, which will cause the workpiece to continue to be heat-melted, thus reducing the quality of heat melting and reducing the strength of the workpiece after connection.

[0036] In this solution, when the piston 44 moves into the housing 41, it pushes the columnar heating element 5 to move, causing the heating plate 54 to contact the workpiece. After contacting the workpiece, the electromagnetic coil 100 is energized. The energized electromagnetic coil 100 generates a magnetic force in the liquid chamber housing 41. The magnetic force causes the magnetorheological fluid to solidify. The solidified magnetorheological fluid can stabilize the thrust on the columnar heating element 5, preventing it from continuing to push the columnar heating element 5. Therefore, the problem of continuing to heat the workpiece is avoided, and the quality of the hot melt is improved.

[0037] In this embodiment, the magnetorheological fluid injected into the shell 41 consists of polydimethyl silicone oil-based fluid, carbonyl iron functional particles, dispersant, and stabilizer. Specifically, it is Bohai A186 oil-based magnetorheological fluid. The polydimethyl silicone oil-based fluid has a viscosity of 100 cSt, remains stable within a temperature range of -50℃ to 200℃, and has low volatility. The carbonyl iron particles have a particle size of 5-10 μm and a purity of not less than 99.5%. The particle surface is modified with a silane coupling agent to effectively prevent agglomeration. The dispersant is polyethylene glycol monomethyl ether, added at 1.5% of the total mass of the magnetorheological fluid, to prevent particle sedimentation. The stabilizer is di-tert-butyl-p-cresol, added at 0.5%, to inhibit oxidation of the base fluid. The density of this magnetorheological fluid at 25℃ is 2.8 g / cm³. 3 The initial viscosity in the unenergized state does not exceed 500 mPa·s, and the response time for solidification upon energization and recovery from the fluid state upon de-energization is ≤0.1 seconds. It can reach saturation under a magnetic field strength of 0.8-1.0T, at which point the shear stress after solidification is not less than 15000Pa. It can withstand a reverse pressure of 500N without displacement. The working temperature range is -30℃ to 180℃, and it remains stable during short-term operation within the commonly used temperature range of 180-220℃ for plastic hot melt.

[0038] In this embodiment, the electromagnetic coil 100 installed inside the circular outer shell 42 is wound in a multi-layered, dense-winding manner on an insulating frame. The insulating frame is made of polytetrafluoroethylene (PTFE), which can withstand a high temperature of 260°C. The coil has a total of 500 turns, using enameled copper wire with a diameter of 0.8 mm. Each layer has 50 turns, for a total of 10 layers. The coil is evenly distributed in a ring around the three shells 41, with each coil corresponding to a central angle of 120° within the shell 41, ensuring a uniform magnetic field distribution within the shell cavity. The magnetic field direction of the electromagnetic coil 100 is radially arranged along the shell 41, meaning the magnetic field lines point from the coil towards the center of the shell cavity. This direction allows the ferromagnetic particles in the magnetorheological fluid to align radially, forming a rigid network structure that can prevent the axial movement of the piston rod. When the electromagnetic coil 100 is working, it is supplied with DC current, and the rated working current is 1.5A. It is powered by a dedicated power supply module of the control device 7. The output voltage of this power supply module is 12V, and the current accuracy is controlled within ±0.05A. The rated power of the coil is 18W, which can avoid overheating during long-term operation. The coil insulation class is H, and the insulation material is polyimide film, which can withstand a long-term working temperature of 180℃. After being energized, the magnetic field strength generated at the center of the inner cavity of the shell is 0.8-1.0T. The magnetic field strength deviation at different positions in the inner cavity of the shell does not exceed 5%, ensuring that the solidification degree of the magnetorheological fluid in each conductive part 45 is consistent.

[0039] The specific operating principle is as follows: by energizing the electromagnetic coil 100, a magnetic force is generated inside the casing 41. Magnetic particles, under the influence of the magnetic field, rapidly align themselves into chain-like or columnar structures along the magnetic field direction. The particles form a mechanical network through magnetic dipole interactions. This chain-like structure hinders the flow of the base fluid, causing a sharp increase in viscosity and shear stress, even exhibiting solid-like properties. The stronger the magnetic field, the tighter the particle arrangement, the more stable the chain-like structure, and the higher the shear stress and viscosity of the fluid. When the magnetic force is removed, the chain-like structure of the magnetic particles quickly disintegrates, the particles return to a random distribution, and the magnetorheological fluid returns to a low-viscosity fluid state.

[0040] Preferably, the conductor 45 includes a diverter 451 near the housing 41 and a displacement cylinder 452 near the working chamber 300. The piston rod 51 is located inside the diverter 451, the heat insulation cylinder 52 is located inside the displacement cylinder 452, a sealing kit is provided between the diverter 451 and the displacement cylinder 452, and a magnetic shielding shell 200 is provided on the circular housing 42.

[0041] Specifically, during operation, the piston 44 pushes the magnetorheological fluid into the distribution cylinder 451, causing the piston rod 51 to move from the distribution cylinder 451 into the displacement cylinder 452. The sealing kit ensures that the magnetorheological fluid does not overflow into the displacement cylinder 452, thus preventing contamination of the ceramic heating tube 53 and the control component integrated seat 55. In addition, the magnetic shielding shell 200 ensures that the magnetic force does not overflow.

[0042] In this embodiment, a scanning device 6 is fixedly installed on the worktable 1. The scanning device 6 includes a scanning frame 61 and a scanning channel 62 within the scanning frame 61. A laser scanner 63 is installed on the side of the scanning channel 62 within the scanning frame 61. A thickness gauge 64 is installed within the scanning channel 62. A control device 7 is installed on the side of the worktable 1. The thickness gauge 64, the laser scanner 63, and the control device 7 are electrically connected. The control component integrated base 55 includes a temperature sensor and a controller. The control component integrated base 55 and the ceramic heating tube 53 are both electrically connected to the control device 7. An electric cylinder 8 with a push end and a piston 44 fixedly connected is installed on the worktable 1.

[0043] In the specific operation, the workpiece enters the inlet table 2, and then its heating end is inserted into the scanning channel 62. The thickness gauge 64 enters the interior of the heating end, and the laser scanner 63 is located outside the heating end. The laser scanner 63 and the thickness gauge 64 scan the inside and outside of the heating end to obtain the wall thickness at each point of the heating end. Then the workpiece enters the working chamber 300 through the scanning channel 62 for hot melting operation.

[0044] Because some workpieces have irregularly shaped heating ends, the wall thickness varies at different points on the heating end, resulting in different degrees of heat melting required. Thicker wall sections require higher power heating, while thinner sections require lower power heating. Therefore, when each columnar heating element 5 is heating the workpiece, the power can be adjusted by controlling the integrated base 55 of each control element through the control device 7, which better suits the processing of irregular workpieces.

[0045] Specifically, in this embodiment, the control unit integration base 55 includes an armored K-type thermocouple temperature sensor and a micro PID controller. The armored K-type thermocouple temperature sensor has a temperature measurement accuracy of ±0.5℃ and can provide real-time temperature data feedback. The micro PID controller is used to receive sensor signals and adjust heating power, and communicates with the main control system built into the control device 7 via RS485 or CAN bus.

[0046] In addition, in this embodiment, the movement of piston 44 is controlled by electric cylinder 8.

[0047] This embodiment can be applied to operations requiring high precision. The scanning device 6 can first scan the heating end of the workpiece, and the scanning results can be used to control the heating power of each columnar heating element 5 in the subsequent hot melting stage.

[0048] Example 2

[0049] See attached document Figure 2-7 Based on Embodiment 1, an inlet platform 2 is provided above the workbench 1, and a positioning platform 3 is provided below the workbench 1. The inlet platform 2 includes an inlet frame 21, and the positioning platform 3 includes a positioning frame 31. Multiple hydraulic cylinders 9 are fixed between the workbench 1 and the inlet platform 2, and a connecting rod 10 is fixedly installed between the piston 44 and the inlet platform 2.

[0050] In this embodiment, the workpiece is input from the inlet frame 21 and can be fixed by the inlet frame 21. Then, the hydraulic cylinder 9 is activated, so that the inlet table 2 moves closer to the worktable 1. At this time, the heating end of the workpiece enters the work chamber 300 and is then heated by the columnar heating element 5. The workpiece with the connection can be fixed at the positioning frame 31.

[0051] This embodiment can be applied in working environments where high heat-melting requirements are necessary. Furthermore, in this embodiment, the components within the several columnar heating elements 5 are connected in series, so each columnar heating element 5 generates the same heating power. Most importantly, this embodiment has a low cost, making it suitable for most users.

[0052] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0053] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0054] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A hot melt machine for plastic processing, characterized in that, Including the installation of dotted hot melt device (4) inside the workbench (1); The point-like hot melting device (4) includes several shells (41), which are located inside a circular outer shell (42). The shell (41) includes a fan-shaped support plate (43), and a working chamber (300) is formed between the fan-shaped support plates (43). The shell (41) is filled with magnetorheological fluid, and the shell (41) is provided with a piston (44). An electromagnetic coil (100) is installed inside the circular outer shell (42) surrounding the several shells (41). A number of evenly distributed conductive elements (45) connected to the shell (41) are installed inside the fan-shaped support plate (43). The conductive elements (45) are provided with movable columnar heating elements (5). The columnar heating element (5) includes a piston rod (51) and a heat insulation cylinder (52). A ceramic heating tube (53) is installed inside the heat insulation cylinder (52). A heating plate (54) facing the working chamber (300) is installed on the ceramic heating tube (53). A control component integrated seat (55) is also installed inside the heat insulation cylinder (52).

2. The hot melt machine for plastic processing according to claim 1, characterized in that, The conductor (45) includes a flow divider (451) near the housing (41) and a displacement cylinder (452) near the working chamber (300). The piston rod (51) is located inside the flow divider (451), and the heat insulation cylinder (52) is located inside the displacement cylinder (452). A sealing kit is provided between the flow divider (451) and the displacement cylinder (452). The circular housing (42) is covered with a magnetic shielding housing (200).

3. The hot melt machine for plastic processing according to claim 1, characterized in that, A scanning device (6) is fixedly installed on the workbench (1). The scanning device (6) includes a scanning frame (61) and a scanning channel (62) inside the scanning frame (61). A laser scanner (63) installed inside the scanning frame (61) is provided on the side of the scanning channel (62). A thickness gauge (64) is provided inside the scanning channel (62). A control device (7) is installed on the side of the workbench (1). The thickness gauge (64), the laser scanner (63), and the control device (7) are electrically connected.

4. The hot melt machine for plastic processing according to claim 3, characterized in that, The control unit integration base (55) includes a temperature sensor and a controller. Both the control unit integration base (55) and the ceramic heating tube (53) are electrically connected to the control device (7). An electric cylinder (8) with a push end and a piston (44) fixedly connected is installed on the worktable (1).

5. The hot melt machine for plastic processing according to claim 1, characterized in that, An inlet platform (2) is provided above the workbench (1), and a positioning platform (3) is provided below the workbench (1). The inlet platform (2) includes an inlet frame (21), and the positioning platform (3) includes a positioning frame (31).

6. The hot melt machine for plastic processing according to claim 2, characterized in that, Multiple hydraulic cylinders (9) are fixed between the worktable (1) and the guide table (2), and a connecting rod (10) is fixedly installed between the piston (44) and the guide table (2).

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