An electric heating ring device for injection molding machine

Abstract

The present invention relates to the technical field of injection molding machine accessories, and proposes an electric heating coil device for an injection molding machine, comprising a housing, a heat insulation layer, a heating component, and an auxiliary lead wire group, wherein the housing and the heating component are provided with a through hole for passing through a heating cylinder of the injection molding machine; the auxiliary lead wire group is arranged between the inner side of the heat insulation layer and the outer side of the heating component; the heating component comprises a plurality of tubes, and a heating wire arranged in each tube; the heating wire is provided with an extension section extending onto the auxiliary lead wire group and extending outwardly from the tube body, the auxiliary lead wire group is wound around the heating wire extension section to form a winding section, and the winding section and the extension section are fixedly connected by pressing, so that the auxiliary lead wire group and the heating wire are fixedly matched and form a composite connection structure for carrying high-power current. By arranging the auxiliary lead wire group and the extension section of the heating wire to form a winding section, a composite connection structure is formed, which significantly improves the current carrying capacity.

Description

Technical Field

[0001] The invention relates to the technical field of injection molding machine accessories, in particular to an electric heating ring device for an injection molding machine. Background Art

[0002] Currently, the heating components of coil heaters used in injection molding machines typically consist of a heating wire, a metal support plate, and a quartz tube. The heating wire, serving as the heating core, is typically made of nickel-chromium (NiCr) or iron-chromium-aluminum (FeCrAl) alloy and is wound into a spiral to increase the heating surface area. The metal support plate secures the quartz tube, which then inserts the heating wire. Lead wires are located at the ends of the heating wires. During heating, these lead wires absorb heat from the wires. Heat damage can cause the lead wires to become loose. Summary of the Invention

[0003] This invention proposes a coil heater for injection molding machines. By providing an auxiliary lead wire assembly and an extension of the heating wire to form a winding segment, a composite connection structure significantly improves current carrying capacity. This design effectively solves the problem of traditional heating wire lead wires loosening or thermal damage caused by high temperatures, thereby extending the service life.

[0004] An electric heating ring device for an injection molding machine designed for this purpose includes a hollow shell, a heat insulation layer, a heating component and an auxiliary lead wire group arranged in the shell, and the shell and the heating component are provided with a through hole for passing through the heating cylinder of the injection molding machine;

[0005] The auxiliary lead wire group is arranged between the inner side of the heat insulation layer and the outer side of the heating component;

[0006] The heating component includes a plurality of tubes for forming a ring-shaped electric heating ring, and a heating wire arranged in each tube;

[0007] The heating wire is provided with an extension section extending to the auxiliary lead wire group and extending outward from the tube body. The auxiliary lead wire group is wound on the extension section of the heating wire to form a winding section, and the winding section and the extension section are fixedly connected by pressing. The auxiliary lead wire group and the heating wire are fixedly matched to form a composite connection structure for carrying high-power current.

[0008] The auxiliary lead wire group is made of nickel-manganese alloy with high thermal stability; the heating wire is made of nickel alloy.

[0009] A number of porcelain beads for heat dissipation and heat insulation are provided on the outside of the auxiliary lead wire group. The porcelain beads are sleeved on the outside of the auxiliary lead wire group. The porcelain beads are provided with through holes for passing through the auxiliary lead wire group. A heat dissipation gap is formed between the through holes and the auxiliary lead wire group. The outside of the porcelain beads forms an insulation layer between the auxiliary lead wire group and the heating component.

[0010] The heating component includes a bracket for cooperating in positioning and installing several tube bodies. A first outlet hole and a second outlet hole are respectively provided at the ends of the auxiliary lead-out wire group at both ends of the bracket. The outlet hole at one end of the bracket serves as the positive electrode outlet hole, and the outlet hole at the other end of the bracket serves as the negative electrode outlet hole.

[0011] The heat insulation layer covers the outer side of the bracket, and the heat insulation layer is used to reduce heat loss when the heating component is working;

[0012] The heat-insulating layer is adapted to the outer contour of the bracket and presents a split arc-shaped structure.

[0013] The thermal insulation layer material is aerogel.

[0014] The bracket is provided with positioning blocks at both ends, one side of the positioning block extends toward the outside of the bracket, and an external open cavity for accommodating the installation of the thermal insulation layer and the auxiliary lead-out wire group is formed between the positioning block and the outside of the bracket; the wire outlet hole is provided on the positioning block.

[0015] The other side of the positioning block extends toward the inside of the bracket to position the pipe body. A heat insulating piece and a heat insulating positioning piece are provided on the outside of the positioning block. The heat insulating piece is located between the heat insulating positioning piece and the positioning block.

[0016] The shell is provided with blocking limit edges at both ends of the heat insulation layer to prevent the heat insulation layer from escaping from the electric heating coil device; the outer side of the shell is provided with a lead-out seat corresponding to the auxiliary lead-out wire group, and the lead-out seat is provided with a threading hole connected to the inner cavity of the shell;

[0017] A pressing piece is provided between the blocking limit edge and the upper portion of the heat insulation layer.

[0018] The housing comprises a first shell and a second shell, a hinge is provided between one end of the first shell and the second shell, and a locking assembly is provided between the other end of the first shell and the second shell.

[0019] The beneficial technical effects of the present invention are as follows:

[0020] By integrating an auxiliary lead wire assembly with the extended section of the heating wire to form a winding segment, a composite connection structure significantly improves current-carrying capacity. This design effectively eliminates the problem of traditional heating wire lead wires becoming loose or thermally damaged due to high temperatures, thereby extending their service life. The hollow structure of the housing, combined with a thermal insulation layer, reduces heat loss and improves thermal efficiency. The heating element utilizes a split tube design for easy assembly and installation, while through-holes ensure compatibility with the heating cylinder of the injection molding machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the three-dimensional structure of the electric heating coil device in the locked state according to one embodiment of the present invention.

[0022] Figure 2 Schematic diagram of the three-dimensional structure of the electric heating ring device in the unlocked state according to one embodiment of the present invention.

[0023] Figure 3 This is a schematic diagram of the exploded three-dimensional structure of the thermal insulation layer and the bracket assembly according to one embodiment of the present invention.

[0024] Figure 4 Schematic diagram of the three-dimensional structure of a tube body according to an embodiment of the present invention.

[0025] Figure 5 Schematic diagram of the three-dimensional structure of a bracket according to an embodiment of the present invention.

[0026] Figure 6 Schematic diagram of the three-dimensional structure of a housing according to an embodiment of the present invention.

[0027] Figure 7 Schematic diagram of the three-dimensional structure of the auxiliary lead wire group and the heating wire according to an embodiment of the present invention.

[0028] Figure 8 This is a schematic diagram of the three-dimensional structure in which porcelain beads are provided on the outside of the auxiliary lead wire group according to one embodiment of the present invention.

[0029] Figure 9 Schematic diagram of the cross-sectional structure of an electric heating ring device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, many specific details are set forth in the following description to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0031] See also Figures 1-9 An electric heating ring device for an injection molding machine includes a hollow shell 10, a heat insulation layer 8, a heating component 2, and an auxiliary lead wire group 4 arranged in the shell 10. The shell 10 and the heating component 2 are provided with a through hole 2.1 for passing through the heating cylinder of the injection molding machine;

[0032] The auxiliary lead wire group 4 is arranged between the inner side of the heat insulation layer 8 and the outer side of the heating component 2;

[0033] The heating component 2 includes a plurality of tubes 1 for forming a ring-shaped electric heating ring, and a heating wire 3 arranged in each tube 1;

[0034] The heating wire 3 is provided with an extension section 3.1 extending onto the auxiliary lead wire assembly 4 and extending outward from the tube body 1. The auxiliary lead wire assembly 4 is wound around the extension section 3.1 of the heating wire 3 to form a winding section 5. The winding section 5 and the extension section 3.1 are fixedly connected by pressing (it can be understood that after the winding section 5 is tightened, it is pressed between the extension section 3.1 to further fix the two). The auxiliary lead wire assembly 4 and the heating wire 3 are fixedly matched to form a composite connection structure capable of carrying high-power current. The combination of nickel-manganese alloy and highly conductive nickel alloy (such as nickel-copper) can carry high-power current.

[0035] The nickel-manganese alloy auxiliary lead wire assembly 4 is tightly wound around the extension section 3.1 of the nickel alloy heating wire 3, creating multiple points of contact and significantly reducing contact resistance. The nickel-manganese alloy's oxidation resistance matches that of nickel alloy, and the winding structure maintains a reliable connection even under the long-term high-temperature operation of the injection molding machine, thus enabling the assembly to carry high-power currents without burning out. The nickel-manganese alloy auxiliary lead wire assembly 4 and the nickel alloy heating wire 3, through their material compatibility (thermal expansion matching and oxidation resistance) and structural design (multiple winding points), ensure stable transmission of high currents.

[0036] The material of the heating wire 3 is nickel alloy.

[0037] The electric heating coil device for the injection molding machine forms a winding section 5 by setting an auxiliary lead-out wire group 4 and an extension section 3.1 of the heating wire 3, forming a composite connection structure, which significantly improves the current carrying capacity. This design effectively solves the problem of looseness or heat damage caused by high temperature of the traditional heating wire lead-out wire, and prolongs the service life. The hollow structure of the shell 10 combined with the heat insulation layer 8 reduces heat loss and improves thermal efficiency. The heating component 2 adopts a split tube body 1 design, which is easy to assemble and install into the heating component 2. At the same time, the through hole 2.1 ensures compatibility with the heating cylinder of the injection molding machine.

[0038] The auxiliary lead wire group 4 is made of nickel-manganese alloy with high thermal stability. Nickel-manganese alloy has excellent high temperature resistance and oxidation resistance, and can work stably for a long time in a high temperature environment. The resistivity of nickel-manganese alloy is moderate, which can effectively share the current and avoid excessive heating. After this material is combined with the extension section 3.1 of the heating wire 3, the mechanical strength and electrical conductivity of the composite connection structure are further enhanced, the contact resistance is reduced, and the energy loss is reduced. In addition, the nickel-manganese alloy has good flexibility and is easy to be wound into the winding section 5. Nickel-manganese alloy has good thermal stability and avoids the phenomenon of high-temperature wire burning.

[0039] A number of porcelain beads 6 for heat dissipation and heat insulation are provided on the outside of the auxiliary lead-out group 4. The porcelain beads 6 are sleeved on the outside of the auxiliary lead-out group 4. The porcelain beads 6 are provided with a through-hole 6.1 for passing through the auxiliary lead-out group 4. A heat dissipation gap is formed between the through-hole 6.1 and the auxiliary lead-out group 4. The outside of the porcelain beads 6 forms a heat insulation layer between the auxiliary lead-out group 4 and the heating component 2.

[0040] The setting of the porcelain bead 6 realizes the dual functions of heat dissipation and heat insulation of the auxiliary lead wire group 4. The heat dissipation gap between the perforation 6.1 and the auxiliary lead wire group 4 promotes heat diffusion and prevents local excessive temperature. The thermal insulation layer formed on the outside of the porcelain bead 6 reduces the transfer of heat to the heating component 2. The high-temperature stability of the porcelain bead 6 ensures that it will not fail in a long-term high-temperature environment, while its insulation properties avoid the risk of short circuit. This design optimizes thermal management, extends the service life of the auxiliary lead wire group 4 and the heating wire 3, and improves the reliability and energy efficiency of the device.

[0041] The heating component 2 includes a bracket 7 for cooperating in positioning and installing a plurality of tube bodies 1. A first outlet hole 7.1 and a second outlet hole 7.2 are respectively provided at the ends of the auxiliary lead-out wire group 4 at both ends of the bracket 7. The outlet hole at one end of the bracket 7 serves as the positive electrode outlet hole, and the outlet hole at the other end of the bracket 7 serves as the negative electrode outlet hole.

[0042] The bracket 7 may be additionally provided with a perforation for passing the auxiliary lead wire group 4 to the outer side of the bracket 7. Alternatively, the auxiliary lead wire group 4 passes through the corresponding lead hole and then reaches the outer side of the bracket 7 along the positioning block 7.3 of the bracket 7.

[0043] Bracket 7 separates the positive and negative poles of auxiliary lead-out group 4 through first and second outlet holes 7.1 and 7.2, simplifying the wiring structure and reducing installation difficulty. The annular design of bracket 7 ensures uniform distribution of tube body 1, making the heat distribution of heating component 2 more uniform. The clear distinction between the positive and negative outlet holes avoids wiring errors and improves safety. The rigid structure of bracket 7 provides stable support for tube body 1, preventing it from being displaced due to thermal deformation or vibration, and ensuring the long-term stable operation of the electric heating coil device. This design also facilitates modular assembly and maintenance, reducing production costs.

[0044] The heat insulation layer 8 covers the outer side of the bracket 7, and the heat insulation layer 8 is used to reduce the heat loss of the heating component 2 when it is working;

[0045] The heat-insulating layer 8 is adapted to the outer contour of the bracket 7 and has a split arc-shaped structure.

[0046] The ceramic beads 6 are located between the bracket 7 and the thermal insulation layer 8 .

[0047] The thermal insulation layer 8 wraps around the outside of the bracket 7, significantly reducing heat loss and improving energy efficiency. The split curved structure adapts to the outer contour of the bracket 7, ensuring a tight fit and preventing heat leakage. The ultra-low thermal conductivity of the aerogel material further enhances the thermal insulation effect, while its lightweight properties reduce the overall weight of the device. The split design of the thermal insulation layer 8 facilitates disassembly and replacement, reducing maintenance costs. This structure also prevents the outer shell 10 from aging due to high temperatures, extending the service life of the device.

[0048] The thermal insulation layer 8 is made of aerogel.

[0049] The thermal insulation layer 8 is made of aerogel. Its high-temperature resistance ensures its stability even in long-term high-temperature environments, avoiding the sintering or degradation issues associated with traditional insulation materials. Its lightweight design reduces the overall weight of the heating coil assembly, facilitating installation and transportation. The aerogel's flexibility also adapts to the thermal expansion and contraction of the bracket 7, preventing cracking due to stress concentration. This environmentally friendly and non-toxic material meets the green manufacturing requirements of modern industry.

[0050] The bracket 7 is provided with a positioning block 7.3 at both ends, and one side of the positioning block 7.3 extends toward the outside of the bracket 7. An external open cavity for accommodating the installation of the thermal insulation layer 8 and the auxiliary lead wire group 4 is formed between the positioning block 7.3 and the outside of the bracket 7; the wire outlet hole is set on the positioning block 7.3.

[0051] The open cavity formed between the positioning block 7.3 and the outer side of the bracket 7 provides installation space for the thermal insulation layer 8 and the auxiliary lead wire assembly 4, simplifying the assembly process. The extended design of the positioning block 7.3 enhances the structural strength of the bracket 7 and prevents its deformation. The outlet hole is integrated into the positioning block 7.3 to ensure the fixation and guidance of the auxiliary lead wire assembly 4, avoiding cable clutter. The open cavity design provides operating space for subsequent installation. This structure optimizes the space utilization within the device and improves the overall compactness and aesthetics.

[0052] The other side of the positioning block 7.3 extends toward the inside of the bracket 7 for positioning the tube body 1. A heat insulating member 9 and a heat insulating positioning member 18 are provided on the outside of the positioning block 7.3. The heat insulating member 9 is located between the heat insulating positioning member 18 and the positioning block 7.3. The heat insulating positioning member 18 is used to position the heat insulating member 9. The upper and lower limits of the heat insulating member 9 are between the heat insulating positioning member 18 and the positioning block 7.3.

[0053] The inner extension of the positioning block 7.3 realizes the precise positioning of the tube body 1 and ensures the annular uniformity of the heating component 2.

[0054] The heat insulating member 9 is a gypsum board.

[0055] The shell 10 is provided with blocking limit edges 11 at both ends of the heat insulation layer 8 to prevent the heat insulation layer 8 from escaping from the electric heating coil device; the outer side of the shell 10 is provided with a lead-out seat 12 corresponding to the auxiliary lead-out wire group 4, and the lead-out seat 12 is provided with a threading hole 13 communicating with the inner cavity of the shell 10;

[0056] A pressing piece 14 is provided between the blocking and limiting edge 11 and the upper portion of the heat insulation layer 8 .

[0057] The shielding and limiting edge 11 prevents the thermal insulation layer 8 from accidentally falling off, ensuring the long-term stability of the device. The through-hole 13 of the outlet socket 12 provides a safe outlet path for the auxiliary lead wire assembly 4, preventing cable wear. The press-fit member 14 further secures the position of the thermal insulation layer 8, preventing it from shifting due to vibration. The segmented design of the housing 10 facilitates installation and maintenance of internal components.

[0058] The housing 10 includes a first shell 15 and a second shell 16 . A hinge is provided between one end of the first shell 15 and the second shell 16 , and a lock assembly 17 is provided between the other end of the first shell 15 and the second shell 16 .

[0059] The first shell 15 and the second shell 16 are quickly opened and closed by a hinge and a lock assembly 17, so that the outer shell 10 can be easily placed on the outside of the barrel of the injection molding machine.

[0060] In this embodiment, the tube body 1 is a quartz glass tube.

[0061] The plurality of tubes 1 of the electric heating ring device are sleeved on the outside of the barrel of the injection molding machine to heat the plastic in the barrel to make the plastic form a molten state, which is convenient for the screw in the barrel to extrude and mix.

[0062] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An electric heating ring device for an injection molding machine, characterized in that: The invention comprises a hollow shell (10), a heat-insulating layer (8), a heating component (2), and an auxiliary lead wire group (4) arranged in the shell (10); the shell (10) and the heating component (2) are provided with a through hole (2.1) for passing through a heating cylinder of an injection molding machine; The auxiliary lead wire group (4) is arranged between the inner side of the heat insulation layer (8) and the outer side of the heating component (2); The heating component (2) comprises a plurality of tubes (1) for forming a ring-shaped electric heating ring, and a heating wire (3) arranged in each tube (1); The heating wire (3) is provided with an extension section (3.1) extending to the auxiliary lead wire group (4) and extending outward from the tube body (1); the auxiliary lead wire group (4) is wound on the extension section (3.1) of the heating wire (3) to form a winding section (5); and the winding section (5) and the extension section (3.1) are fixedly connected by pressing; the auxiliary lead wire group (4) and the heating wire (3) are fixedly matched to form a composite connection structure for carrying high-power current; A plurality of porcelain beads (6) for heat dissipation and heat insulation are provided on the outside of the auxiliary lead wire group (4), the porcelain beads (6) are sleeved on the outside of the auxiliary lead wire group (4), the porcelain beads (6) are provided with through holes (6.1) for passing through the auxiliary lead wire group (4), a heat dissipation gap is formed between the through holes (6.1) and the auxiliary lead wire group (4), and the outside of the porcelain beads (6) forms a heat insulation layer between the auxiliary lead wire group (4) and the heating component (2); The heating component (2) includes a bracket (7) for cooperating with and positioning a plurality of tube bodies (1). A first outlet hole (7.1) and a second outlet hole (7.2) are respectively provided at two ends of the bracket (7) corresponding to the ends of the auxiliary lead wire group (4). The outlet hole at one end of the bracket (7) serves as a positive electrode outlet hole, and the outlet hole at the other end of the bracket (7) serves as a negative electrode outlet hole.

2. The electric heating ring device for injection molding machine according to claim 1, characterized in that: The auxiliary lead wire group (4) is made of nickel-manganese alloy lead wires with high thermal stability; the heating wire (3) is made of nickel alloy.

3. The electric heating ring device for injection molding machine according to claim 1, characterized in that: The heat-insulating layer (8) covers the outer side of the bracket (7), and the heat-insulating layer (8) is used to reduce heat loss when the heating component (2) is working; The heat-insulating layer (8) is adapted to the outer contour of the bracket (7) and presents a split arc-shaped structure.

4. The electric heating ring device for injection molding machine according to claim 1, characterized in that: The thermal insulation layer (8) is made of aerogel.

5. The electric heating ring device for injection molding machine according to claim 1, characterized in that: Positioning blocks (7.3) are respectively provided at both ends of the bracket (7), one side of the positioning block (7.3) is extended toward the outside of the bracket (7), and an external open cavity for accommodating the installation of the thermal insulation layer (8) and the auxiliary lead-out wire group (4) is formed between the positioning block (7.3) and the outside of the bracket (7); the lead-out hole is provided on the positioning block (7.3).

6. The electric heating ring device for injection molding machine according to claim 5, characterized in that: The other side of the positioning block (7.3) is extended toward the inside of the bracket (7) to position the tube body (1). A heat insulating member (9) and a heat insulating positioning member (18) are provided on the outside of the positioning block (7.3). The heat insulating member (9) is located between the heat insulating positioning member (18) and the positioning block (7.3).

7. The electric heating ring device for injection molding machine according to claim 1, characterized in that: The shell (10) is provided with blocking limit edges (11) at both ends of the heat insulation layer (8) to prevent the heat insulation layer (8) from escaping from the electric heating coil device; the outer side of the shell (10) is provided with a lead-out seat (12) corresponding to the auxiliary lead-out wire group (4), and the lead-out seat (12) is provided with a threading hole (13) communicating with the inner cavity of the shell (10); A pressing piece (14) is provided between the shielding limiting edge (11) and the upper portion of the heat-insulating layer (8).

8. The electric heating ring device for an injection molding machine according to claim 1, characterized in that: The housing (10) comprises a first shell (15) and a second shell (16), a hinge is provided between one end of the first shell (15) and the second shell (16), and a lock assembly (17) is provided between the other end of the first shell (15) and the second shell (16).

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