Energy-saving heating sleeve for injection molding machine cylinder

Abstract

The utility model relates to industrial heating equipment technical field, concretely relates to a kind of injection molding machine barrel energy-saving heating jacket.The utility model provides a kind of injection molding machine barrel energy-saving heating jacket, including sleeve body, heating element in sleeve body and temperature sensor for monitoring temperature in sleeve body, the sleeve body includes substrate layer, heating layer, reflecting layer, heat preservation layer and protective shell from inside to outside in order;The substrate layer is flexible ceramic fiber cloth, tightly covered in the outer surface of injection molding machine barrel, the temperature sensor is buried in the contact interface of substrate layer and injection molding machine barrel;The heating layer is the heating element embedded substrate layer surface, and the heating element is serpentine distribution resistance wire;The reflecting layer is the metal foil of overlapping laying, and its reflecting surface is towards the direction of barrel axis;The heat preservation layer is nanometer aerogel composite felt;The protective shell is segmented stainless steel armoring, and each segment is detachably connected by connecting sleeve.

Description

Technical Field

[0001] This utility model relates to the field of industrial heating equipment technology, specifically to an energy-saving heating jacket for injection molding machine barrels. Background Technology

[0002] The injection molding machine barrel is one of the core components of plastic injection molding equipment. Its function is to melt plastic particles by heating and maintain a stable melt temperature to meet the process requirements of injection molding.

[0003] Traditional injection molding machine barrel heating jackets typically use a metal shell to enclose heating elements (such as resistance wires). While this provides basic heating, it suffers from several significant drawbacks: First, the insulation layer of traditional heating jackets often uses ordinary glass wool or rock wool, which has high thermal conductivity, allowing heat to easily dissipate into the environment, resulting in low heating efficiency and high energy consumption. Second, the heating elements are mostly arranged in a linear pattern, resulting in a small contact area with the barrel surface, which can easily lead to uneven local temperatures and affect melt quality. Third, the protective shell is usually a one-piece metal structure, requiring complete disassembly for installation and maintenance, making the process cumbersome. Therefore, there is an urgent need for a barrel heating jacket with optimized structure, high energy efficiency, and easy maintenance. Utility Model Content

[0004] The purpose of this utility model is to provide an energy-saving heating jacket for injection molding machine barrels. Through multi-layer composite structure design, dynamic temperature control module integration and detachable protective structure, it solves the problems of low heating efficiency, serious heat loss, lagging temperature control and inconvenient maintenance in the prior art.

[0005] The present invention provides an energy-saving heating jacket for injection molding machine barrels, comprising a jacket body, a heating element disposed within the jacket body, and a temperature sensor for monitoring the temperature within the jacket body. The jacket body, from the inside out, comprises a substrate layer, a heating layer, a reflective layer, a heat insulation layer, and a protective outer shell. The substrate layer is a flexible ceramic fiber cloth tightly covering the outer surface of the injection molding machine barrel. The temperature sensor is embedded at the interface between the substrate layer and the injection molding machine barrel. The heating layer consists of a heating element embedded in the surface of the substrate layer, which is a serpentine distribution of resistance wires. The reflective layer is an overlapping layer of metal foil, with its reflective surface facing the barrel axis. The heat insulation layer is a nano-aerogel composite felt. The protective outer shell is a segmented stainless steel armor, with each segment detachably connected via connecting sleeves.

[0006] As a preferred embodiment of this invention, the reflective layer is composed of alternating layers of aluminum foil and silicon dioxide coating.

[0007] As a preferred embodiment of this utility model, the temperature sensor is a K-type thermocouple, and its detection end contacts the outer wall of the injection molding machine barrel through a thermally conductive silicone pad.

[0008] As a preferred embodiment of this invention, the insulation layer is embedded with reinforcing fibers arranged in a grid pattern.

[0009] As a preferred embodiment of this utility model, the outer peripheral surface of the protective shell is provided with an annular heat dissipation groove, and multiple vertical heat dissipation fins are arranged circumferentially inside the annular heat dissipation groove.

[0010] As a preferred technical solution of this utility model, the connecting sleeve includes a plug-in sleeve and a sealing block disposed at both ends of the protective shell that can be plugged into and fixed to each other, and the plug-in sleeve and the sealing block are fixedly connected by multiple buckles.

[0011] As a preferred technical solution of this utility model, a sealing pressure plate is provided between the plug sleeve and the sealing plug, and high-temperature resistant silicone sealing strips are embedded on both sides of the sealing pressure plate. The high-temperature resistant silicone sealing strips are compressed and filled into the joint gap when fastened.

[0012] The advantages of this utility model compared with the prior art are as follows:

[0013] 1. High-efficiency thermal insulation and energy saving: The substrate layer uses flexible ceramic fiber cloth, which has good adhesion and high temperature resistance; the reflective layer uses an alternating layering structure of aluminum foil and silicon dioxide coating to effectively reflect the infrared radiation heat generated by the heating element and reduce the loss to the environment; the insulation layer uses nano aerogel composite felt (thermal conductivity ≤0.02W / (m·K)) and is combined with mesh-like reinforcing fibers to enhance mechanical strength, significantly reducing heat conduction loss, and improving the overall energy saving efficiency by more than 30% compared with the traditional structure.

[0014] 2. Uniform heating: The serpentine distribution of resistance wires increases the contact area with the barrel surface. Combined with the flexible bonding characteristics of the substrate layer, it improves the circumferential temperature uniformity of the barrel (temperature difference ≤5℃) and avoids local overheating or melt degradation.

[0015] 3. Convenient maintenance: The protective shell adopts a segmented stainless steel armor, and each segment is quickly connected by plug-in sleeves, sealing blocks and buckles. When disassembling, you only need to loosen the buckle to separate a single segment of the shell, without the need for complete disassembly, which improves maintenance efficiency by 50%.

[0016] 4. Excellent protective performance: The annular heat dissipation groove and heat sink work together to prevent local overheating of the protective shell; the sealing pressure plate and high-temperature resistant silicone strip compress and fill the gaps in the joints, achieving an IP54 protection level, which can adapt to dusty, humid and other harsh environments and extend service life. Attached Figure Description

[0017] Figure 1 This is a structural diagram of an energy-saving heating jacket for an injection molding machine barrel according to the present invention.

[0018] Figure 2This is a cross-sectional three-dimensional structural diagram of an energy-saving heating jacket for an injection molding machine barrel according to the present invention.

[0019] Figure 3 This is an enlarged view of section A of the energy-saving heating jacket for the injection molding machine barrel according to this utility model.

[0020] Figure 4 This is a layered structural diagram of the sleeve of an energy-saving heating sleeve for an injection molding machine barrel according to the present invention.

[0021] Figure 5 This is a schematic diagram showing the connection of multiple sleeves in an energy-saving heating sleeve for an injection molding machine barrel according to the present invention.

[0022] As shown in the figure:

[0023] 1. Sleeve body; 2. Heating element; 3. Temperature sensor; 4. Substrate layer; 5. Heating layer; 6. Reflective layer; 7. Insulation layer; 8. Protective shell; 9. Connecting sleeve; 10. Aluminum foil; 11. Silica coating; 12. Reinforcing fiber; 13. Annular heat dissipation groove; 14. Heat sink; 15. Insert sleeve; 16. Sealing block; 17. Fastener; 18. Sealing pressure plate; 19. High-temperature resistant silicone sealing strip. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] Example 1:

[0027] As per the instruction manual Figure 1-5 As shown, an energy-saving heating jacket for injection molding machine barrels includes a jacket body 1, a heating element 2 disposed inside the jacket body 1, and a temperature sensor 3 for monitoring the temperature inside the jacket body 1. The jacket body 1 includes, from the inside to the outside, a substrate layer 4, a heating layer 5, a reflective layer 6, a heat insulation layer 7, and a protective shell 8.

[0028] In this utility model, the substrate layer 4 is a flexible ceramic fiber cloth, which is tightly wrapped around the outer surface of the injection molding machine barrel. The temperature sensor 3 is embedded in the interface between the substrate layer 4 and the injection molding machine barrel. The temperature sensor 3 is a K-type thermocouple, and its detection end is in contact with the outer wall of the injection molding machine barrel through a thermally conductive silicone pad. The temperature sensor 3 is located on the outside of the sleeve 1 and is connected to a temperature control module that dynamically adjusts the power of the heating layer 5.

[0029] In this invention, the heating layer 5 is a heating element 2 embedded in the surface of the substrate layer 4, and the heating element 2 is a resistance wire with a serpentine distribution.

[0030] In this invention, the reflective layer 6 is an overlapping metal foil with its reflective surface facing the axis of the barrel. The reflective layer 6 is composed of multiple layers of aluminum foil 10 and silicon dioxide coating 11 stacked alternately.

[0031] In this invention, the insulation layer 7 is a nano-aerogel composite felt, and the interior of the insulation layer 7 is embedded with reinforcing fibers 12 distributed in a grid pattern.

[0032] In this utility model, the protective shell 8 is a segmented stainless steel armor. The outer peripheral surface of the protective shell 8 is provided with an annular heat dissipation groove 13. The interior of the annular heat dissipation groove 13 is provided with a plurality of vertical heat dissipation fins 14 arranged in the circumferential direction. Each segment is detachably connected by a connecting sleeve 9. The connecting sleeve 9 includes a plug-in sleeve 15 and a sealing plug 16 located at both ends of the protective shell 8 that can be plugged into each other for fixation. The plug-in sleeve 15 and the sealing plug 16 are fixedly connected by a plurality of buckles 17. A sealing pressure plate 18 is provided between the plug-in sleeve 15 and the sealing plug 16. High-temperature resistant silicone sealing strips 19 are embedded on both sides of the sealing pressure plate 18. When the high-temperature resistant silicone sealing strips 19 are fastened, they compress and fill the gap of the joint.

[0033] Working principle

[0034] 1. Heating process: After power is applied, the serpentine resistance wire of heating layer 5 generates heat due to the current heating effect (power density 500W / m). 2 Some of the heat is transferred directly to the barrel through heat conduction, while some of the heat diffuses to the surroundings in the form of infrared radiation.

[0035] 2. Thermal Insulation: The aluminum foil 10 and silicon dioxide coating 11 of the reflective layer 6 have high reflectivity (≥90%) for infrared radiation, reflecting most of the radiant heat back to the direction of the material cylinder; the nano-aerogel composite felt of the thermal insulation layer 7 blocks heat conduction through internal nanopores (≤50nm) (thermal conductivity ≤0.02W / (m·K)), and with the glass fiber mesh reinforcement structure, effectively reduces heat loss to the environment; the annular heat dissipation groove 13 and heat sink 14 form heat dissipation channels on the surface of the protective shell 8 to avoid excessive local temperature of the shell (≤80℃).

[0036] 3. Temperature control: The K-type thermocouple monitors the surface temperature of the barrel in real time via a thermally conductive silicone pad (response time ≤ 1s), and the signal is transmitted to the temperature control module (PID controller). If the measured temperature is lower than the set value, the module increases the power supply of heating element 2; if it is higher than the set value, the power is reduced or heating is paused, and the barrel temperature is finally stabilized within ±2℃ to meet the requirements of high-precision injection molding process.

[0037] The present invention and its embodiments have been described above. This description is not restrictive, and the specific embodiments shown are only one of the embodiments of the present invention. The actual structure is not limited to this. In short, if a person skilled in the art is inspired by this description and designs a similar structure and embodiment without departing from the inventive spirit of the present invention, such design should fall within the protection scope of the present invention.

Claims

1. An energy-saving heating jacket for injection molding machine barrels, comprising a jacket body (1), a heating element (2) disposed within the jacket body (1), and a temperature sensor (3) for monitoring the temperature within the jacket body (1), characterized in that: The sleeve (1) consists of, from the inside out, a base material layer (4), a heating layer (5), a reflective layer (6), a heat insulation layer (7), and a protective outer shell (8); The substrate layer (4) is a flexible ceramic fiber cloth, which is tightly wrapped around the outer surface of the injection molding machine barrel. The temperature sensor (3) is embedded in the interface between the substrate layer (4) and the injection molding machine barrel. The heating layer (5) is a heating element (2) embedded in the surface of the substrate layer (4), and the heating element (2) is a resistance wire with a serpentine distribution; The reflective layer (6) is an overlapping metal foil with its reflective surface facing the axis of the barrel. The insulation layer (7) is a nano-aerogel composite felt; The protective shell (8) is a segmented stainless steel armor, and each segment can be detachably connected by a connecting sleeve (9).

2. The energy-saving heating jacket for injection molding machine barrels according to claim 1, characterized in that: The reflective layer (6) is composed of alternating layers of aluminum foil (10) and silicon dioxide coating (11).

3. The energy-saving heating jacket for injection molding machine barrels according to claim 1, characterized in that: The temperature sensor (3) is a K-type thermocouple, and its detection end is in contact with the outer wall of the injection molding machine barrel through a thermally conductive silicone pad.

4. The energy-saving heating jacket for injection molding machine barrels according to claim 1, characterized in that: The insulation layer (7) is embedded with reinforcing fibers (12) arranged in a grid pattern.

5. The energy-saving heating jacket for injection molding machine barrels according to claim 1, characterized in that: The outer peripheral surface of the protective shell (8) is provided with an annular heat dissipation groove (13), and multiple vertical heat dissipation fins (14) are arranged circumferentially inside the annular heat dissipation groove (13).

6. The energy-saving heating jacket for injection molding machine barrels according to claim 1, characterized in that: The connecting sleeve (9) includes a plug-in sleeve (15) and a sealing block (16) located at both ends of the protective shell (8) and can be plugged into each other for fixation. The plug-in sleeve (15) and the sealing block (16) are fixedly connected by multiple buckles (17).

7. The energy-saving heating jacket for injection molding machine barrels according to claim 6, characterized in that: A sealing plate (18) is provided between the plug sleeve (15) and the sealing plug (16). High-temperature resistant silicone sealing strips (19) are embedded on both sides of the sealing plate (18). The high-temperature resistant silicone sealing strips (19) are compressed and filled in the joint gap when fastened.

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