A cooling structure of an injection molding machine cylinder and an injection molding machine

Abstract

The utility model discloses a cooling structure and injection molding machine of injection molding machine cylinder, wherein, cooling structure includes cylinder, annular water jacket, front sealing ring cover, rear sealing ring cover and spiral spring, annular water jacket gap is covered on the outer ring circumference of cylinder, and front sealing ring cover and rear sealing ring cover are fixed at the front and rear two ends of annular water jacket respectively, and all are sealedly connected with the outer ring circumference of cylinder, and the annular cooling cavity is formed between cylinder, annular water jacket, front sealing ring cover and rear sealing ring cover, and spiral spring is located in annular cooling cavity, and the axial two ends of annular cooling cavity are respectively opened to liquid inlet and liquid outlet, so that the cooling liquid that enters by liquid inlet flows to liquid outlet along the spiral direction of spiral spring in annular cooling cavity. The cooling structure has the advantages of good cooling uniformity, simple structure, easy cleaning and maintenance.

Description

Technical Field

[0001] This utility model belongs to the field of injection molding machine cooling technology, and specifically relates to a cooling structure for the barrel of an injection molding machine and an injection molding machine. Background Technology

[0002] When thermosetting materials are processed in the plasticizing unit of an injection molding machine, the barrel, as the core component for material conveying and plasticizing, needs to maintain a specific temperature environment to ensure the fluidity of the molten material. Because thermosetting materials are prone to solidification, improper barrel temperature control can cause the molten material to solidify and clump inside the barrel. This not only affects the normal conveying of materials and the quality of injection molding but may also cause equipment jamming, malfunctions, and downtime. Therefore, targeted cooling treatment of the barrel is necessary.

[0003] In existing technologies, the common cooling solution for the barrel of a thermosetting material injection molding machine is to install a cooling water jacket on the outside of the barrel. This cooling water jacket has spiral grooves machined into its inner or outer wall. Cooling water enters through the inlet of the cooling water jacket, flows along the spiral grooves, and exits through the outlet, forming a spiral circulating cooling water path to achieve circumferential cooling of the barrel. However, this existing cooling structure has significant drawbacks in practical applications: First, the machining process of the spiral grooves is complex, requiring custom-made cutting tools, resulting in high machining difficulty, low production efficiency, and significantly increased manufacturing costs. Second, to meet the machining allowance and structural strength requirements of the spiral grooves, the cooling water jacket needs to use thicker raw materials, further increasing raw material costs. Third, the water quality in the user's environment is often difficult to control. When the water quality is poor, scale easily accumulates at the bottom and around the spiral grooves of the cooling water jacket after long-term use. The structural characteristics of the spiral grooves make subsequent scale removal difficult, affecting not only the flow efficiency and cooling effect of the cooling water path but also significantly increasing equipment maintenance costs.

[0004] It is evident that the existing barrel cooling structure of the thermosetting material plasticizing unit in injection molding machines is inadequate in terms of processing cost, raw material cost, and ease of maintenance, making it difficult to meet the actual needs of low-cost, easy-to-maintain, and efficient cooling in industrial production. Therefore, an optimized barrel cooling solution is urgently needed to solve the above-mentioned technical problems. Utility Model Content

[0005] To address the aforementioned problems, this utility model discloses a cooling structure for the barrel of an injection molding machine and an injection molding machine, in order to overcome or at least partially solve the aforementioned problems.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: This utility model discloses a cooling structure for the barrel of an injection molding machine, the cooling structure including a barrel, an annular water jacket, a front sealing ring, a rear sealing ring, and a helical spring; The annular water jacket is fitted around the outer circumference of the barrel. The front sealing ring and the rear sealing ring are fixed at the front and rear ends of the annular water jacket, respectively, and are sealed to the outer circumference of the barrel. An annular cooling cavity is formed between the barrel, the annular water jacket, the front sealing ring, and the rear sealing ring. The helical spring is located inside the annular cooling cavity. The annular cooling cavity has an inlet and an outlet at its axial ends, respectively, so that the coolant entering through the inlet flows along the helical direction of the helical spring to the outlet within the annular cooling cavity.

[0007] Furthermore, a compression preload is formed on the helical spring, and the two ends of the helical spring abut against the front sealing ring and the rear sealing ring, respectively.

[0008] Furthermore, the diameter of the coil spring wire is the same as the distance between the outer circumferential surface of the barrel and the inner circumferential surface of the annular water jacket.

[0009] Furthermore, the coil spring has multiple water-dividing holes along its axial direction on the spring wire.

[0010] Furthermore, in the helical spring, the spacing between two adjacent turns of spring wire is 8 to 12 times the diameter of the spring wire.

[0011] Furthermore, both the inner circumferential surface of the water jacket and the outer circumferential surface of the barrel are provided with a chrome-plated coating.

[0012] Furthermore, the cooling structure also includes a front fixing screw / bolt and a rear fixing screw / bolt; The inner circumferential surface of the front end of the annular water jacket is recessed to form a front step. The front sealing ring is inserted from the front end of the annular water jacket between the barrel and the annular water jacket, and is located at the front step. The front fixing screw / bolt passes through the annular water jacket and the front sealing ring in sequence along the radial direction of the barrel and is screwed into the front threaded hole on the barrel. The inner circumferential surface of the rear end of the annular water jacket is recessed to form a rear step. The rear sealing ring is inserted from the rear end of the annular water jacket between the barrel and the annular water jacket, and is located at the rear step. The rear fixing screw / bolt passes through the annular water jacket and the rear sealing ring in sequence along the radial direction of the barrel and is screwed into the rear threaded hole on the barrel.

[0013] Furthermore, both the front sealing ring and the rear sealing ring have an outer annular groove formed on their outer circumferences, and an outer sealing ring is provided in the outer annular groove. The outer sealing ring abuts against the inner circumferential surface of the annular water jacket. Both the front sealing ring and the rear sealing ring have an inner annular groove formed on their inner circumferences, and an inner sealing ring is provided in the inner annular groove. The inner sealing ring abuts against the outer circumferential surface of the barrel.

[0014] Furthermore, threaded holes are provided on the outer end face of both the front sealing ring and the rear sealing ring along the radial direction of the barrel.

[0015] Another aspect of this utility model discloses an injection molding machine having the cooling structure for the injection molding machine barrel described above.

[0016] The advantages and beneficial effects of this utility model are: Excellent cooling effect, ensuring stable equipment operation: This invention replaces the traditional machined spiral groove structure by setting a spiral spring in the annular cooling chamber to form a spiral cooling water channel, achieving the same circumferential cooling effect as the spiral cooling water channel. This cooling water channel allows the cooling water to flow evenly along the outer circumference of the barrel, ensuring a uniform temperature distribution in the barrel and effectively preventing thermosetting molten material from solidifying and agglomerating inside the barrel. This, in turn, ensures the stability and reliability of the injection and metering process in the plasticizing unit of the injection molding machine, ensuring that the molded product meets the quality standards.

[0017] Simplified processing and reduced manufacturing costs: Compared to traditional cooling water jackets that require custom-made special tools to machine spiral grooves, this utility model utilizes a spiral spring to directly form a spiral cooling channel, eliminating the need for complex machining of the annular water jacket. This not only significantly reduces processing difficulty and improves production efficiency but also saves on the cost of custom-made special tools, resulting in substantial savings in processing and manufacturing costs. At the same time, the annular water jacket does not require a pre-reserved machining allowance for the spiral groove, allowing for a relatively thinner material wall thickness, effectively reducing the amount of raw materials used and further lowering raw material costs.

[0018] Easy maintenance and reduced operating costs: Addressing the issue of scale buildup and difficult cleaning in traditional spiral groove structures, this new cooling structure is easy to disassemble. When poor water quality leads to scale buildup, components such as the annular water jacket and spiral springs can be easily disassembled for cleaning. This not only simplifies the descaling process and reduces maintenance time but also lowers subsequent maintenance labor and time costs, providing customers with significant convenience and enhancing product reputation. Attached Figure Description

[0019] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 This is a three-dimensional structural diagram of the cooling structure of the injection molding machine barrel in one embodiment of the present invention; Figure 2 This is a right view of the cooling structure of the injection molding machine barrel in one embodiment of the present invention; Figure 3 This is an axial cross-sectional view of the cooling structure of the injection molding machine barrel in one embodiment of the present invention; Figure 4 This is a three-dimensional structural diagram of the front sealing ring sleeve in one embodiment of the present invention; Figure 5 This is an axial cross-sectional view of the cooling structure of the injection molding machine barrel in a specific embodiment of the present invention.

[0020] In the diagram: 1. Barrel; 2. Annular water jacket; 3. Front sealing ring; 4. Rear sealing ring; 5. Helical spring; 6. Annular cooling chamber; 7. Liquid inlet; 8. Liquid outlet; 9. Front fixing screw; 10. Rear fixing screw; 11. Outer annular groove; 12. Outer sealing ring; 13. Inner annular groove; 14. Inner sealing ring; 15. Threaded hole; 16. Temperature sensing element; 17. Nozzle; 18. Screw. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0022] The terms "before" and "after" in the specification and claims of this utility model may explicitly or implicitly include one or more of the features. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0023] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0024] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of 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.

[0025] To facilitate understanding and description of the technical solution of this utility model, it is hereby ordered that... Figure 3 The left side is the front or front end, let Figure 3 The right side is the rear side or rear end.

[0026] The technical solutions provided by the various embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0027] One embodiment of this utility model provides a cooling structure for the barrel 1 of an injection molding machine, such as... Figures 1 to 3 As shown, the cooling structure includes a barrel 1, an annular water jacket 2, a front sealing ring 3, a rear sealing ring 4, and a helical spring 5.

[0028] Specifically, the annular water jacket 2 is fitted onto the outer circumference of the barrel 1 with a gap, creating a predetermined distance between the inner circumferential surface of the annular water jacket 2 and the outer circumferential surface of the barrel 1, providing space for coolant flow. The front sealing ring 3 and the rear sealing ring 4 are fixed to the front and rear ends of the annular water jacket 2, respectively, and both are sealed to the outer circumference of the barrel 1. Ultimately, the outer circumferential surface of the barrel 1, the inner circumferential surface of the annular water jacket 2, the end face of the front sealing ring 3, and the end face of the rear sealing ring 4 together form a closed annular cooling cavity 6. The annular cooling cavity 6 has an inlet 7 and an outlet 8 at its axial ends, respectively. The inlet 7 is used to receive external coolant, and the outlet 8 is used to discharge the cooled coolant after heat exchange. A helical spring 5 is fitted and installed within the annular cooling cavity 6, allowing the coolant to flow orderly along the helical direction of the helical spring 5 within the annular cooling cavity 6, forming a spiral cooling water path.

[0029] The helical spring 5, after assembly, forms a compression preload. Its two ends abut against the inner walls of the front sealing ring 3 and the rear sealing ring 4, respectively. This preload ensures the positional stability of the helical spring 5 within the annular cooling chamber 6, preventing axial displacement due to coolant impact and ensuring the continuity and stability of the cooling water path. Furthermore, the diameter of the helical spring 5's wire is the same as the distance between the outer circumference of the barrel 1 and the inner circumference of the annular water jacket 2. This ensures a tight fit between the inner surface of the wire and the outer surface of the barrel 1, and between the outer surface and the inner surface of the annular water jacket 2. This effectively divides the annular cooling chamber 6 into continuous spiral channels, ensuring coolant flow along the spiral trajectory and improving cooling uniformity. In addition, the spacing between adjacent turns of the helical spring 5 is set to 8-12 times the wire diameter. This optimized spacing range ensures both sufficient coolant flow velocity within the spiral channels to prevent insufficient heat exchange due to slow flow, and prevents excessive spacing from affecting cooling uniformity, ensuring consistent temperature across all areas of the barrel 1.

[0030] In addition, the inner circumferential surface of the annular water jacket 2 and the outer circumferential surface of the barrel 1 in this embodiment are provided with a chrome-plated coating. The chrome-plated coating has the characteristics of high hardness, wear resistance and corrosion resistance. On the one hand, it can reduce the friction loss between the helical spring 5 and the contact surface and extend the service life of the components; on the other hand, it can resist the corrosion of the coolant and prevent scale from directly adhering to the surface of the barrel 1 and the annular water jacket 2, further reducing the difficulty of maintenance.

[0031] In other embodiments, the coil spring 5 has multiple water-dividing holes (not shown in the figure) along its axial direction on the spring wire. The water-dividing holes are evenly distributed around the circumference of the spring wire, which can divide the coolant in the spiral channel, so that most of the coolant flows through the spiral channel and a small part of the coolant flows through the water-dividing holes. When the two coolants with different flow directions merge, they will collide, which will enhance the turbulence effect of the coolant and further improve the heat exchange efficiency of the coolant.

[0032] In this embodiment, as Figure 1 and Figure 3 As shown, the cooling structure also includes a front fixing screw 9 / bolt and a rear fixing screw 10 / bolt, used to fix the annular water jacket 2, the front sealing ring 3 and the rear sealing ring 4 to the barrel 1.

[0033] Specifically, the inner circumferential surface of the front end of the annular water jacket 2 is sunk to form a front step. The front sealing ring 3 is inserted from the front end of the annular water jacket 2 into the space between the barrel 1 and the annular water jacket 2, and is limited to abutting against the front step. The front fixing screw 9 / bolt passes through the side wall of the annular water jacket 2 and the side wall of the front sealing ring 3 in sequence along the radial direction of the barrel 1, and finally screws into the pre-set front screw hole on the outer circumferential surface of the barrel 1 to achieve a fixed connection of the three. When the front sealing ring 3 is inserted into the space between the barrel 1 and the annular water jacket 2, it abuts against the stepped surface of the front step, and the insertion depth of the front sealing ring 3 is limited by the front step. The inner circumferential surface of the rear end of the annular water jacket 2 is recessed to form a rear step. The rear sealing ring 4 is inserted from the rear end of the annular water jacket 2 between the barrel 1 and the annular water jacket 2, and is limited to abutting against the rear step. The rear fixing screw 10 / bolt passes through the side wall of the annular water jacket 2 and the side wall of the rear sealing ring 4 in sequence along the radial direction of the barrel 1, and is screwed into the pre-set rear screw hole on the outer circumferential surface of the barrel 1, thus completing the fixation of the overall structure. When the rear sealing ring 4 is inserted between the barrel 1 and the annular water jacket 2, it abuts against the stepped surface of the rear step, and the rear step limits the insertion depth of the rear sealing ring 4. This fixing method is easy to assemble, reliable in connection, and can withstand the impact force from the coolant flow, preventing loosening after long-term use.

[0034] And, as Figure 4 As shown, both the front sealing ring 3 and the rear sealing ring 4 have an outer annular groove 11 on their outer circumference. An outer sealing ring 12 is fitted inside the outer annular groove 11, and the outer sealing ring 12 abuts tightly against the inner circumferential surface of the annular water jacket 2, achieving radial sealing between the annular water jacket 2 and the sealing ring. Both the front sealing ring 3 and the rear sealing ring 4 have an inner annular groove 13 on their inner circumference. An inner sealing ring 14 is fitted inside the inner annular groove 13, and the inner sealing ring 14 abuts tightly against the outer circumferential surface of the barrel 1, achieving radial sealing between the sealing ring and the barrel 1. Through this double sealing structure, coolant leakage from the assembly gap is effectively prevented, ensuring the sealing performance and operational stability of the cooling system.

[0035] In addition, such as Figure 2 and Figure 4 As shown, threaded holes 15 are provided radially on the outer end face of the front sealing ring 3 (i.e., the end face away from the annular water jacket 2) and the outer end face of the rear sealing ring 4 (i.e., the end face away from the annular water jacket 2) of the barrel 1. When disassembly and maintenance are required, screws or bolts can be screwed into the threaded holes 15, and the front sealing ring 3 and the rear sealing ring 4 can be easily pulled out from the annular water jacket 2 by pulling the screws or bolts. This eliminates the need for complicated disassembly procedures, greatly improving disassembly and assembly efficiency and facilitating the cleaning and descaling of the annular cooling chamber 6 and the helical spring 5. The number of threaded holes 15 on the outer end faces of the front sealing ring 3 and the rear sealing ring 4 is multiple and centrally symmetrically arranged, facilitating the uniform application of tension to the front sealing ring 3 and the rear sealing ring 4.

[0036] like Figure 1 and Figure 2 As shown, the cooling structure also includes a temperature detection element 16; the temperature detection element 16 passes through the annular water jacket 2 and extends into the annular cooling cavity 6 to detect the temperature of the coolant in the annular cooling cavity 6, thereby facilitating the adjustment of the coolant flow rate according to the temperature of the coolant in the annular cooling cavity 6, so as to improve the cooling and heat dissipation effect of the cooling structure.

[0037] And, as Figure 1 and Figure 3 As shown, the inlet 7 and outlet 8 are located on the circumference of the annular water jacket 2, and the inlet 7 and outlet 8 are respectively connected to the two ends of the spiral channel formed by the spiral spring 5. This structure facilitates the processing and formation of the inlet 7 and outlet 8.

[0038] In one specific embodiment of this utility model, such as Figure 5 As shown, the specific application of this cooling structure on a silicone injection molding machine is as follows: The annular water jacket 2, the front sealing ring 3, and the rear sealing ring 4 are fixed to the barrel 1 of the silicone injection molding machine by two fixing screws (front fixing screw 9 and rear fixing screw 10). A screw 18 is installed inside the barrel 1, and a nozzle 17 is installed at the front end of the barrel 1. The inlet 7 and outlet 8 of the cooling structure are connected to water pipes to supply cooling water. The molten silicone material is conveyed forward by the rotation of the injection molding machine screw 18. Thanks to the cooling effect of the cooling structure, the silicone material in the conveying process is kept in a molten state and gradually conveyed forward to the nozzle 17. Then, the molten silicone material is injected into the mold by the injection force generated by the injection cylinder.

[0039] Another embodiment of this utility model provides an injection molding machine having the cooling structure of the injection molding machine barrel in the above embodiment, which has the advantages of good cooling uniformity, simple structure, and convenient cleaning.

[0040] It is understandable that the cooling structure in this utility model has the following advantages: Excellent cooling effect ensures stable equipment operation: By setting a spiral spring in the annular cooling chamber to form a spiral cooling water channel, replacing the traditional machined spiral groove structure design, the same circumferential cooling effect of the spiral cooling water channel is achieved. Furthermore, this cooling water channel allows the cooling water to flow evenly along the outer circumference of the barrel, ensuring a uniform temperature distribution within the barrel and effectively preventing thermosetting molten material from solidifying and agglomerating inside the barrel. This, in turn, ensures the stability and reliability of the injection and metering process in the plasticizing unit of the injection molding machine, guaranteeing that the molded product quality meets standards.

[0041] Simplified processing and reduced manufacturing costs: Compared to traditional cooling water jackets that require custom-made special tools to machine spiral grooves, this utility model utilizes a spiral spring to directly form a spiral cooling channel, eliminating the need for complex machining of the annular water jacket. This not only significantly reduces processing difficulty and improves production efficiency but also saves on the cost of custom-made special tools, resulting in substantial savings in processing and manufacturing costs. At the same time, the annular water jacket does not require a pre-reserved machining allowance for the spiral groove, allowing for a relatively thinner material wall thickness, effectively reducing the amount of raw materials used and further lowering raw material costs.

[0042] Easy maintenance and reduced operating costs: Addressing the issue of scale buildup and difficult cleaning in traditional spiral groove structures, this new cooling structure is easy to disassemble. When poor water quality leads to scale buildup, components such as the annular water jacket and spiral springs can be easily disassembled for cleaning. This not only simplifies the descaling process and reduces maintenance time but also lowers subsequent maintenance labor and time costs, providing customers with significant convenience and enhancing product reputation.

[0043] The above description is merely a specific embodiment of this utility model. Under the teachings of this utility model, those skilled in the art can make other improvements or modifications based on the above embodiments. Those skilled in the art should understand that the above specific description is only to better explain the purpose of this utility model, and the scope of protection of this utility model should be determined by the scope of the claims.

Claims

1. A cooling structure for the barrel of an injection molding machine, characterized in that, The cooling structure includes a barrel, an annular water jacket, a front sealing ring, a rear sealing ring, and a helical spring; The annular water jacket is fitted around the outer circumference of the barrel. The front sealing ring and the rear sealing ring are fixed at the front and rear ends of the annular water jacket, respectively, and are sealed to the outer circumference of the barrel. An annular cooling cavity is formed between the barrel, the annular water jacket, the front sealing ring, and the rear sealing ring. The helical spring is located inside the annular cooling cavity. The annular cooling cavity has an inlet and an outlet at its axial ends, respectively, so that the coolant entering through the inlet flows along the helical direction of the helical spring to the outlet within the annular cooling cavity.

2. The cooling structure of the injection molding machine barrel according to claim 1, characterized in that, The helical spring has a compression preload, and its two ends abut against the front sealing ring and the rear sealing ring, respectively.

3. The cooling structure of the injection molding machine barrel according to claim 1, characterized in that, The diameter of the coil spring wire is the same as the distance between the outer circumferential surface of the barrel and the inner circumferential surface of the annular water jacket.

4. The cooling structure of the injection molding machine barrel according to claim 1, characterized in that, The coil spring has multiple water-dividing holes along its axial direction on the spring wire.

5. The cooling structure for the injection molding machine barrel according to claim 1, characterized in that, In the helical spring, the spacing between two adjacent turns of spring wire is 8 to 12 times the diameter of the spring wire.

6. The cooling structure of the injection molding machine barrel according to claim 1, characterized in that, Both the inner circumferential surface of the water jacket and the outer circumferential surface of the barrel are provided with chrome plating.

7. The cooling structure of the injection molding machine barrel according to claim 1, characterized in that, The cooling structure also includes front fixing screws / bolts and rear fixing screws / bolts; The inner circumferential surface of the front end of the annular water jacket is recessed to form a front step. The front sealing ring is inserted from the front end of the annular water jacket between the barrel and the annular water jacket, and is located at the front step. The front fixing screw / bolt passes through the annular water jacket and the front sealing ring in sequence along the radial direction of the barrel and is screwed into the front threaded hole on the barrel. The inner circumferential surface of the rear end of the annular water jacket is recessed to form a rear step. The rear sealing ring is inserted from the rear end of the annular water jacket between the barrel and the annular water jacket, and is located at the rear step. The rear fixing screw / bolt passes through the annular water jacket and the rear sealing ring in sequence along the radial direction of the barrel and is screwed into the rear threaded hole on the barrel.

8. The cooling structure for the injection molding machine barrel according to claim 7, characterized in that, Both the front sealing ring and the rear sealing ring have an outer annular groove formed on their outer circumferences. An outer sealing ring is provided in the outer annular groove and abuts against the inner circumferential surface of the annular water jacket. Both the front sealing ring and the rear sealing ring have an inner annular groove formed on their inner circumferences. An inner sealing ring is provided in the inner annular groove and abuts against the outer circumferential surface of the barrel.

9. The cooling structure for the injection molding machine barrel according to claim 7, characterized in that, Both the outer end face of the front sealing ring and the outer end face of the rear sealing ring have threaded holes along the radial direction of the barrel.

10. An injection molding machine, characterized in that, The injection molding machine has a cooling structure for the injection molding machine barrel as described in any one of claims 1 to 9.

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