Hot melting machine for plastic processing

Abstract

The invention relates to the technical field of plastic processing equipment, in particular to a fuse machine for plastic processing. According to the technical scheme, a point-shaped hot melting device is installed in a working table and comprises a plurality of shells, the shells are located in a circular shell, each shell comprises a fan-shaped bearing plate, a working chamber is formed among the multiple fan-shaped bearing plates, magnetorheological fluid is injected into the shells, the shells are provided with pistons, and the pistons are connected with the working table. An electromagnetic coil arranged around the shells is installed in the circular shell, a plurality of conducting pieces which are evenly distributed and communicate with the shells are installed in the fan-shaped bearing plate, movable columnar heating pieces are arranged in the conducting pieces and comprise piston rods and heat insulation barrels, ceramic heating pipes are installed in the heat insulation barrels, and the piston rods are connected with the heat insulation barrels. And the ceramic heating pipe is provided with a heating plate facing the working chamber. Each columnar heating piece can make contact with the heating end of an irregular workpiece, so that a large number of columnar heating pieces distributed in a point shape can wrap the workpiece, and the problem that the columnar heating pieces cannot be fully attached to a complex contour is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of plastic processing equipment, in particular to a hot melt machine for plastic processing. Background Art

[0002] In the plastics processing industry, heating irregular and irregular workpieces has always presented numerous challenges. Traditional flat heating plates, due to their fixed shape, cannot fully conform to the complex contours of irregular workpieces (such as deep grooves or multi-boss structures). This can lead to insufficient or overheating of the workpiece, resulting in quality issues such as carbonization and incomplete melting of the weld surface, seriously affecting product quality and performance.

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

[0004] The purpose of the present invention is to provide a multi-columnar heating rod combined heating device for special-shaped and irregular workpieces. Through the combination of multi-columnar heating rods and adjustable design, contour-fitting heating of special-shaped and irregular workpieces can be achieved, 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 is as follows: a hot melt machine for plastic processing, comprising a dotted hot melt device installed in a workbench; The point-shaped hot melt device includes a plurality of shells, which are located in a circular outer shell. The shells include sector-shaped support plates. A working chamber is formed between the sector-shaped support plates. The shells are filled with magnetorheological fluid and provided with pistons. An electromagnetic coil arranged around the plurality of shells is installed in the circular outer shell. Several conductive parts evenly distributed and connected to the shell are installed in the fan-shaped carrier plate, and movable columnar heating parts are arranged in the conductive parts; The columnar heating element includes a piston rod and an insulating cylinder. A ceramic heating tube is installed in the insulating cylinder. The ceramic heating tube is equipped with a heating plate facing the working chamber. A control component integrated seat is also installed in the insulating cylinder.

[0006] Preferably, the conductive part includes a diverter tube close to the shell and a displacement tube close to the working chamber, the piston rod is located in the diverter tube, the insulation tube is located in the displacement tube, a sealing kit is provided between the diverter tube and the displacement tube, and a magnetic isolation shell is provided on the outer shell of the circular shell.

[0007] Preferably, a scanning device is fixedly installed on the workbench, and the scanning device includes a scanning frame and a scanning channel in the scanning frame. A laser scanner installed in the scanning frame is provided on the scanning channel side, and a thickness gauge is provided in the scanning channel. A control device is installed on the workbench side, and the thickness gauge, the laser scanner and the control device are electrically connected.

[0008] Preferably, the control component integrated seat includes a temperature sensor and a controller, the control component integrated seat and the ceramic heating tube are electrically connected to the control device, and an electric cylinder with a push end and a piston fixedly connected is installed on the workbench.

[0009] Preferably, an introduction platform is provided above the workbench, and a positioning platform is provided below the workbench. The introduction platform includes an introduction frame, and the positioning platform includes a positioning frame.

[0010] Preferably, a plurality of hydraulic cylinders are fixed between the working platform and the introduction platform, and a connecting rod is fixedly installed between the piston and the introduction platform.

[0011] Compared with the existing technology, the beneficial effects of the present invention are: 1. The present invention adopts a point-shaped hot melt device composed of multiple shells, and injects magnetorheological fluid into the shells. In addition, a number of conductive parts are installed in the fan-shaped support plate, and columnar heating parts are provided in the conductive parts. By pushing the movement of each columnar heating part through the magnetorheological fluid, each columnar heating part can contact the irregular workpiece and the heating end, so that a large number of point-distributed columnar heating parts can wrap the workpiece through the heating plate, solving the problem of not being able to fully fit the complex contour.

[0012] 2. The present invention can make the moving distance of the columnar heating element stable and controllable through the setting of magnetorheological fluid, and can prevent the problem of excessive heating damaging the heating end of the workpiece. When the piston moves into the shell, it will push the columnar heating element to move, so that the heating plate contacts the workpiece. After contacting the workpiece, the electromagnetic coil is energized. The energized electromagnetic coil generates magnetic force in the liquid chamber shell. The magnetic force causes the magnetorheological fluid to solidify. The solidified magnetorheological fluid can stabilize the thrust of the columnar heating element, so that it will not continue to push the columnar heating element in the future, so the problem of continuing to heat the workpiece will not occur, thereby improving the quality of hot melting. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a structural schematic diagram of the point-shaped hot-melt device of the present invention; Figure 3 for Figure 2 Schematic diagram of the local cross-section structure; Figure 4 Schematic diagram of the structure of the columnar heating element of the present invention; Figure 5 Schematic diagram of the installation structure of the columnar heating element of the present invention; Figure 6 Schematic diagram of the structure of the scanning device of the present invention; Figure 7 It is a structural diagram of another embodiment of the present invention.

[0014] Figure numerals: 1. workbench; 2. introduction table; 3. positioning table; 4. point hot melt device; 5. columnar heating element; 6. scanning device; 7. control device; 8. electric cylinder; 9. hydraulic cylinder; 10. connecting rod; 21. introduction frame; 31. positioning frame; 41. shell; 42. circular shell; 43. fan-shaped support plate; 44. piston; 45. conductive part; 451. diverter tube; 452. displacement tube; 51. piston rod; 52. thermal insulation tube; 53. ceramic heating tube; 54. heating plate; 55. control component integrated seat; 61. scanning frame; 62. scanning channel; 63. laser scanner; 64. thickness gauge; 100. electromagnetic coil; 200. magnetic insulation shell; 300. workroom. DETAILED DESCRIPTION

[0015] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0016] Example 1 Refer to the attached Figure 1-6 , a hot melt machine for plastic processing, comprising a workbench 1 in which a dotted hot melt device 4 is installed; The point-shaped hot melt device 4 includes a plurality of housings 41, which are located within a circular housing 42. The housings 41 include sector-shaped support plates 43, with a working chamber 300 formed between the sector-shaped support plates 43. The housings 41 are filled with magnetorheological fluid and provided with a piston 44. The circular housing 42 houses an electromagnetic coil 100 arranged around the plurality of housings 41. Several conductive members 45 are evenly distributed and connected to the housing 41 and installed in the fan-shaped support plate 43. A movable columnar heating member 5 is installed in the conductive member 45. The columnar heating element 5 includes a piston rod 51 and an insulating tube 52 , in which a ceramic heating tube 53 is installed. The ceramic heating tube 53 is equipped with a heating plate 54 facing the working chamber 300 , and a control component integrated seat 55 is also installed in the insulating tube 52 .

[0017] When processing irregular shaped workpieces, traditional flat heating plates cannot fully fit the complex contours of the workpieces due to their fixed shape, resulting in insufficient or excessive heating of the workpieces.

[0018] In the present invention, a plurality of fan-shaped support plates 43 form an operating chamber 300. When the heated end of a workpiece enters the operating chamber 300, the piston 44 moves into the housing 41, forcing the magnetorheological fluid into the plurality of conductive members 45. The magnetorheological fluid then pushes the piston rod 51 toward the operating chamber 300, thereby pushing the heat-insulating cylinder 52 to move, allowing the heating plate 54 to contact the heated end of the workpiece. A large number of point-distributed heating plates 54 are provided, and after each heating plate 54 contacts the heating end of the workpiece, the hydraulic pressure of the magnetorheological fluid causes the heating plate 54 to tightly fit the portion of the workpiece at that location. Therefore, the arrangement of the columnar heating element 5 achieves the effect of completely contacting the irregularities. In addition, the large number of point-distributed heating plates 54 can wrap the irregular heating end of the workpiece, so that all irregularities can be in uniform contact with the heating plate 54, thus solving the problem of not being able to fully fit the complex contours. Then, by starting the ceramic heating tube 53, the heating plate 54 is heated, so that the workpiece can be heated, so that each part of the irregular workpiece can receive heat with the same power, ensuring that there will be no problem of insufficient or excessive heating of the workpiece, thereby improving the effect and quality of hot melting.

[0019] It should also be noted that by injecting magnetorheological fluid into the shell 41, the problem of excessive heating damaging the heating end of the workpiece can be prevented. When the existing workpiece is heated, for example, its wall thickness is 10 mm, and the thickness required for hot melting is 5 mm to be connected to the external workpiece. However, the existing method of pushing by hydraulic oil, because the pressure always exists, when the hot melting is completed to 5 mm, the existence of pressure will push the heating plate 54 to continue moving a part, which will cause the workpiece to continue to be hot-melted, thereby reducing the quality of the hot melting and the strength of the workpiece after connection.

[0020] In the present solution, when the piston 44 moves into the shell 41, it pushes the columnar heating element 5 to move, so that the heating plate 54 contacts the workpiece. After contacting the workpiece, the electromagnetic coil 100 is energized. The energized electromagnetic coil 100 generates magnetic force in the liquid chamber shell 41. The magnetic force causes the magnetorheological fluid to solidify. The solidified magnetorheological fluid can stabilize the thrust on the columnar heating element 5, so that the columnar heating element 5 will not continue to be pushed in the future. Therefore, the problem of continuing to heat the workpiece will not occur, thereby improving the quality of hot melting.

[0021] In this embodiment, the magnetorheological fluid injected into the shell 41 is composed of a polydimethylsilicone oil-based liquid, carbonyl iron functional particles, a dispersant and a stabilizer. The specific model is Bohai A186 oil-based magnetorheological fluid, in which the polydimethylsilicone oil-based liquid has a viscosity of 100 cSt and can remain stable in the temperature range of -50°C to 200°C, and has a 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, and the addition amount is 1.5% of the total mass of the magnetorheological fluid to prevent particle sedimentation. The stabilizer is di-tert-butylparacresol, and the addition amount is 0.5%, which can inhibit the oxidation of the base fluid. The density of this magnetorheological fluid at 25°C is 2.8 g / cm 3 The initial viscosity in the unpowered state does not exceed 500mPa·s, and the response time for solidification when powered on and recovery to the fluid state when powered off is ≤0.1 second; it can reach a saturated state under a magnetic field strength of 0.8-1.0T, at which time the shear stress after solidification is not less than 15000Pa, and it can withstand a reverse pressure of 500N without displacement. The operating temperature range is -30℃ to 180℃, and it remains stable during short-term operation in the temperature range of 180-220℃ commonly used for plastic hot melt.

[0022] In this embodiment, the electromagnetic coil 100 installed in the circular housing 42 is wound in a multi-layer, densely wound manner on an insulating frame made of polytetrafluoroethylene, which can withstand high temperatures of 260°C. The total number of turns of the coil is 500, and the diameter of the enameled copper wire used is 0.8 mm. Each layer is wound with 50 turns, for a total of 10 layers. The coils are evenly distributed in a circular shape around the three housings 41, and the central angle of each coil relative to the housing 41 is 120°, ensuring that the magnetic field is evenly distributed within the housing cavity. The magnetic field direction of the electromagnetic coil 100 is set along the radial direction of the housing 41, that is, the magnetic field lines point from the coil to the center of the housing cavity. This direction can cause the ferromagnetic particles in the magnetorheological fluid to be arranged radially, forming a rigid network structure that can block the axial movement of the piston rod. When the electromagnetic coil 100 is working, direct current is applied, 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 the power supply module is 12V, and the current accuracy is controlled within the range of ±0.05A. The rated power of the coil is 18W, which can avoid overheating during long-term operation; the coil insulation grade is H class, and the insulation material is polyimide film, which can withstand a long-term working temperature of 180°C. After power is turned on, the magnetic field strength generated at the center of the shell cavity is 0.8-1.0T, and the deviation of the magnetic field strength at different positions in the shell cavity does not exceed 5%, ensuring that the degree of solidification of the magnetorheological fluid in each conductive component 45 is consistent.

[0023] The specific operating principle is that by energizing the electromagnetic coil 100 to generate a magnetic force within the housing 41, the magnetic particles are acted upon by the magnetic field, rapidly arranging themselves into chain-like or columnar structures along the magnetic field. 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 the fluid's viscosity and shear stress, and even exhibiting solid-like properties. The greater the magnetic field intensity, the denser 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.

[0024] Preferably, the conductive part 45 includes a diverter tube 451 close to the shell 41 and a displacement tube 452 close to the working chamber 300, the piston rod 51 is located in the diverter tube 451, the insulation tube 52 is located in the displacement tube 452, a sealing kit is provided between the diverter tube 451 and the displacement tube 452, and the circular shell 42 is provided with a magnetic isolation shell 200.

[0025] Specifically, during operation, the piston 44 pushes the magnetorheological fluid into the diverter tube 451, so that the piston rod 51 moves from the diverter tube 451 to the displacement tube 452. The sealing kit can ensure that the magnetorheological fluid does not overflow into the displacement tube 452, thereby ensuring that the ceramic heating tube 53 and the control component integrated seat 55 are not contaminated. In addition, the magnetic isolation shell 200 can ensure that the magnetic force does not overflow.

[0026] In this embodiment, 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 in the scanning frame 61. A laser scanner 63 installed in the scanning frame 61 is provided on the side of the scanning channel 62. A thickness gauge 64 is provided in 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. The control component integrated seat 55 includes a temperature sensor and a controller. The control component integrated seat 55 and the ceramic heating tube 53 are both electrically connected to the control device 7. An electric cylinder 8 with a pushing end and a piston 44 fixedly connected is installed on the workbench 1.

[0027] During specific operations, the workpiece passes through the introduction 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 of each part of the heating end. Then the workpiece passes through the scanning channel 62 and enters the working chamber 300 for hot melting operation.

[0028] Because the heating end of some workpieces is irregular in shape, this results in different wall thicknesses at different locations on the workpiece heating end, requiring different degrees of heat melting. Thicker wall thicknesses require high-power heating, while thicker wall thicknesses require low-power heating. Therefore, when each columnar heating element 5 heats the workpiece, the control device 7 can control the integrated control element base 55 to adjust the power, thereby better meeting the processing conditions of irregular workpieces.

[0029] Specifically, in this embodiment, the control component integrated seat 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°C and can provide real-time feedback of temperature data. The micro PID controller is used to receive sensor signals and adjust the heating power, and communicate with the main control system built into the control device 7 through RS485 or CAN bus.

[0030] In addition, in this embodiment, the movement of the piston 44 is controlled by the electric cylinder 8 .

[0031] This embodiment can be applied to operations requiring high precision, whereby the heating end of the workpiece can be scanned by the scanning device 6 first, and the heating power of each columnar heating element 5 can be controlled one by one in the subsequent hot melting stage based on the scanning result.

[0032] Example 2 Refer to the attached Figure 2-7 Based on the first embodiment, an introduction platform 2 is provided above the work platform 1, and a positioning platform 3 is provided below the work platform 1. The introduction platform 2 includes an introduction frame 21, and the positioning platform 3 includes a positioning frame 31. A plurality of hydraulic cylinders 9 are fixed between the work platform 1 and the introduction platform 2, and a connecting rod 10 is fixedly installed between the piston 44 and the introduction platform 2.

[0033] In this embodiment, the workpiece is input from the introduction frame 21, and the workpiece can be fixed by the introduction frame 21. Then the hydraulic cylinder 9 is started to make the introduction table 2 approach the workbench 1. At this time, the heating end of the workpiece enters the working chamber 300, and then it is heated by the columnar heating element 5, and the connected workpiece can be fixed at the positioning frame 31.

[0034] This embodiment can be used in hot melt processing environments with very high requirements. In addition, in this embodiment, the components within the multiple columnar heating elements 5 are connected in series, so the heating power generated by each columnar heating element 5 is the same. Most importantly, this embodiment is low in cost and meets the needs of most users.

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0036] 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 the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0037] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A hot melt machine for plastic processing, characterized in that: A dotted hot melt device (4) is installed in the workbench (1); The point-shaped hot melt device (4) includes a plurality of shells (41), the shells (41) are located in a circular shell (42), the shells (41) include fan-shaped support plates (43), and a working chamber (300) is formed between the plurality of fan-shaped support plates (43). The shells (41) are filled with magnetorheological fluid, the shells (41) are provided with pistons (44), and electromagnetic coils (100) arranged around the plurality of shells (41) are installed in the circular shell (42); A plurality of evenly distributed conducting members (45) in communication with the housing (41) are installed in the fan-shaped support plate (43), and a movable columnar heating member (5) is provided in the conducting member (45); The columnar heating element (5) comprises a piston rod (51) and a heat-insulating tube (52). A ceramic heating tube (53) is installed in the heat-insulating tube (52). The ceramic heating tube (53) is installed with a heating plate (54) facing the working chamber (300). A control component integrated seat (55) is also installed in the heat-insulating tube (52).

2. The hot melt machine for plastic processing according to claim 1, characterized in that: The conducting member (45) includes a shunt cylinder (451) close to the housing (41) and a displacement cylinder (452) close to the operating chamber (300), the piston rod (51) is located in the shunt cylinder (451), the heat insulating cylinder (52) is located in the displacement cylinder (452), a sealing kit is provided between the shunt cylinder (451) and the displacement cylinder (452), and a magnetic isolation shell (200) is provided on the outer shell of the circular housing (42).

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), and the scanning device (6) includes a scanning frame (61) and a scanning channel (62) in the scanning frame (61). A laser scanner (63) installed in the scanning frame (61) is provided on the side of the scanning channel (62), and a thickness gauge (64) is provided in the scanning channel (62). A control device (7) is installed on the side of the workbench (1), and 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 component integrated seat (55) includes a temperature sensor and a controller. The control component integrated seat (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 workbench (1).

5. The hot melt machine for plastic processing according to claim 1, characterized in that: An introduction platform (2) is provided above the workbench (1), and a positioning platform (3) is provided below the workbench (1). The introduction platform (2) includes an introduction 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: A plurality of hydraulic cylinders (9) are fixed between the operating platform (1) and the introduction platform (2), and a connecting rod (10) is fixedly installed between the piston (44) and the introduction platform (2).

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