Cooling type screw charging barrel assembly

Abstract

The utility model discloses a cooling type screw rod charging barrel assembly which comprises a charging barrel, a screw rod and an injection molding nozzle, a sectional type charging barrel cooling structure is arranged in the charging barrel, and the sectional type charging barrel cooling structure comprises a plurality of independent cooling cavities distributed in the axial direction of the charging barrel. Each independent cooling cavity is provided with a cooling liquid inlet and a cooling liquid outlet, and a temperature sensor in signal connection with an external control system is arranged in the cooling cavity. According to the cooling type screw charging barrel assembly, segmented independent cooling of all sections of the charging barrel is achieved through the multiple independent cooling cavities, the liquid temperature is controlled through the temperature sensor so that the temperatures of different positions of the charging barrel can be accurately controlled, raw materials in the charging barrel are in the original semi-liquid and semi-solid state all the time, and an injection molding machine can adapt to more physical properties of the raw materials; the injection molding requirements of different injection molding products are met. And through segmented independent cooling, the temperature of the charging barrel can be better controlled, the cooling effect is good, and the applicability is high.

Description

TECHNICAL FIELD

[0001] The utility model relates to injection molding machine technical field especially relates to a cooling type screw material cylinder subassembly. BACKGROUND

[0002] The injection molding machine is also called injection molding machine or injection machine, and most of the vertical injection molding machines at present need to heat raw materials, heat solid raw materials to liquid state and then extrude into a mold.

[0003] However, with the rapid development of the injection molding machine industry, some special materials cannot meet the use requirements, for example, BMC material, which is semi-liquid and semi-solid at room temperature and low temperature, but is a thermosetting material, which becomes solid immediately when encountering high temperature, in order to better meet the production requirements, a cooling type screw material cylinder subassembly needs to be developed to cope with this new type of injection material. The screw material cylinder subassembly needs to meet the semi-liquid and semi-solid material injection requirements, ensure that the semi-liquid and semi-solid state of the raw material in the screw material cylinder subassembly, and realize the liquidization in the mold to complete the molding of the injection product. UTILITY MODEL CONTENTS

[0004] The utility model discloses a kind of cooling type screw material cylinder subassembly, which can keep the semi-liquid and semi-solid state of raw material in the feeding process, no matter which position of screw material cylinder subassembly, after injecting mold through screw material cylinder subassembly, cooling type screw material cylinder subassembly is molded by high-temperature solidification in mold.

[0005] The utility model discloses the technical scheme adopted to achieve the purpose of the application: a cooling type screw material cylinder subassembly, including barrel, screw and injection nozzle, segmented type barrel cooling structure is arranged in the barrel, the segmented type barrel cooling structure includes multiple independent cooling cavities distributed along barrel axial direction, cooling liquid inlet and cooling liquid outlet are respectively arranged on each independent cooling cavity, temperature sensor connected with external control system signal is arranged in the independent cooling cavity. The cooling type screw material cylinder subassembly, by setting segmented type barrel cooling structure in barrel, multiple independent cooling cavities realize the segmented independent cooling of each section of barrel, at the same time, temperature sensor controls liquid temperature to control the temperature of different positions of barrel, so that the raw material in it is always in original semi-liquid and semi-solid state, so that injection molding machine can adapt to more raw material physical properties, meet the requirements of different injection products injection. Moreover, the segmented type cooling barrel structure can better control the temperature of barrel by segmented independent cooling, and has good cooling effect and strong applicability.

[0006] As a preferred, the segmented barrel cooling structure adopts an axial cooling circulation mode, and a plurality of axial circulation channels are arranged axially in each independent cooling cavity. The segmented barrel cooling structure adopts the axial cooling circulation mode, the axial circulation channels are arranged in each independent cooling cavity, axial circulation cooling of the barrel is realized, temperature consistency in each independent cooling cavity can be effectively ensured, the feeding front and rear segments are consistent, the cooling effect is better, temperature control is easier to realize, and the application range is wider.

[0007] As a preferred, the injection nozzle is internally provided with a nozzle cooling cavity, the nozzle cooling cavity is internally provided with a temperature sensor connected with a signal of an external control system, and the injection nozzle is provided with a nozzle liquid inlet and a nozzle liquid outlet. Since the injection nozzle is used to realize injection molding of the raw material by docking with the mold, the mold is in a high temperature state, in order to ensure that the raw material is still in the original semi-liquid and semi-solid state before entering the mold, as a preferred solution, the nozzle cooling cavity is arranged in the injection nozzle, the cooling of the injection nozzle is realized through the nozzle cooling cavity, the cooling of the raw material at the nozzle is realized, and the effective cooling is realized through the temperature sensor for accurate temperature control.

[0008] As a preferred, the nozzle cooling cavity adopts an integrated independent cooling structure or a segmented cooling structure. The nozzle cooling cavity can be provided with an integrated independent cooling structure according to the length of the injection nozzle and cooling needs, or a segmented cooling structure can be adopted to axially arrange a plurality of cooling cavities.

[0009] As a preferred, the nozzle cooling cavity is internally provided with a plurality of nozzle axial cooling channels. The nozzle cooling cavity also adopts an axial cooling channel to realize an axial circulation cooling mode.

[0010] As a preferred, a plunger and a nozzle seat are further included. In another solution, the screw barrel assembly further includes a plunger and a nozzle seat.

[0011] As a preferred, the plunger is internally provided with a plunger cooling cavity, the plunger cooling cavity is independently arranged axially as one or a plurality of independent ones, the plunger cooling cavity is internally provided with a plurality of plunger axial cooling channels, and the plunger cooling cavity is internally provided with a temperature sensor connected with a signal of an external control system. In order to realize better cooling, the plunger cooling cavity is also arranged in the plunger, the plunger cooling cavity can be adjusted to one or a plurality of segmented independent ones. The plunger cooling cavity is preferably an axial cooling mode, a plurality of plunger axial cooling channels are arranged in the plunger cooling cavity, the plunger is cooled through reciprocating circulation of the plunger axial cooling channels. The cooling temperature is accurately controlled through the temperature sensor, and effective cooling is realized.

[0012] As a preferred, the plunger is provided with a plunger liquid inlet and a plunger liquid outlet connected with the plunger cooling cavity.

[0013] As preferred, the nozzle seat is internally provided with a nozzle seat cooling cavity, the nozzle seat cooling cavity is internally provided with a plurality of nozzle seat axial cooling channels, and the nozzle cavity is internally provided with a temperature sensor connected with an external control system signal.

[0014] As preferred, the nozzle seat is provided with a nozzle seat liquid inlet and a nozzle seat liquid outlet connected with the nozzle seat cooling cavity.

[0015] The cooling screw barrel assembly has the advantages that: the cooling screw barrel assembly is provided with a plurality of independent cooling cavities to achieve segmented independent cooling of each section of the barrel, the temperature sensor is used to control the liquid temperature to accurately control the temperature of different positions of the barrel, the raw material in the barrel is always in the original semi-liquid and semi-solid state, the injection molding machine can adapt to more physical properties of raw materials, and the requirements of different injection molding products for injection molding are met. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a structural schematic view of the cooling screw barrel assembly.

[0017] Figure 2 is a structural schematic view of the cooling screw barrel assembly from another angle.

[0018] Figure 3 is an exploded view of the cooling screw barrel assembly.

[0019] Figure 4 is a sectional view of the cooling screw barrel assembly.

[0020] Figure 5 is a sectional view of the cooling screw barrel assembly from another angle.

[0021] Figure 6 is a sectional view of the cooling screw barrel assembly from another direction.

[0022] Figure 7 is a structural schematic view of the cooling screw barrel assembly from another angle.

[0023] Figure 8 is a structural schematic view of the cooling screw barrel assembly from another angle.

[0024] Figure 9 is a sectional view of the cooling screw barrel assembly in Example 2.

[0025] Figure 10 is a schematic view of the application structure of the cooling screw barrel assembly in Example 2.

[0026] In the figure: 1, barrel, 11, barrel injection end, 12, barrel cooling section, 13, barrel connecting end, 14, feed seat, 15, barrel internal thread, 16, barrel connecting flange, 17, feed hole;

[0027] 2, screw, 21, screw feeding end, 22, screw connecting end, 23, internal thread hole;

[0028] 3, screw head, 31, screw head connecting end, 32, screw head feeding end, 33, external thread, 34, push material arc groove;

[0029] 4, injection nozzle, 40, nozzle cooling cavity, 401, nozzle axial cooling channel, 42, nozzle mounting part, 43, nozzle injection end, 44, nozzle external thread, 45, feeding cavity, 46, injection hole, 47, nozzle liquid inlet, 48, nozzle liquid outlet, 49, axial partition plate,

[0030] 5, sectional barrel cooling structure, 51, independent cooling cavity, 52, cooling liquid inlet, 53, cooling liquid outlet, 54, axial circulation channel, 55, partition plate;

[0031] 6, temperature sensor;

[0032] 7, plunger, 70, plunger cooling cavity, 701, plunger axial cooling channel, 71, plunger liquid inlet, 72, plunger liquid outlet, 73, feed inlet;

[0033] 8, nozzle seat, 80, nozzle seat cooling cavity, 801, nozzle seat axial cooling channel, 81, nozzle seat liquid inlet, 82, nozzle seat liquid outlet;

[0034] 10, check ring, 20, check ring,

[0035] 100, barrel fixing seat assembly, 200, injection cylinder assembly. DETAILED DESCRIPTION

[0036] The technical scheme of the present application will be further described in detail below by specific examples and in combination with the drawings.

[0037] Example 1:

[0038] In Figure 1 , Figure 2 , Figure 3In the shown embodiment, a cooling screw barrel assembly includes a barrel 1, a screw 2, a screw head 3 and an injection nozzle 4.

[0039] The screw 2 includes a screw feeding end 21 and a screw connecting end 22, and the end of the screw feeding end 21 is provided with an internally threaded hole 23.

[0040] The screw head 3 includes a screw head connecting end 31 and a screw head feeding end 32, and the screw head connecting end 31 is provided with an externally threaded hole 33, and the screw head connecting end 31 is integrally connected with the screw feeding end 21 through the threaded hole.

[0041] The screw head feeding end 32 is integrally provided with a conical structure, and a plurality of pushing arc grooves 34 are arranged on the outer wall of the screw head feeding end 32. The screw head feeding end and the screw head connecting end are further provided with a non-return ring 10 and a non-return ring 20.

[0042] The barrel 1 includes a barrel injection end 11, a barrel cooling section 12, a barrel connecting end 13 and a feeding seat 14, and the barrel injection end 11 is internally provided with a barrel internal thread 15, and the barrel connecting end 13 is provided with a barrel connecting flange 16. The barrel cooling section 12 is arranged close to the barrel injection end 11, and the feeding seat 14 is arranged close to the barrel cooling section 12 on the side facing the barrel connecting end.

[0043] In this embodiment, the feeding seat 14 is integrally arranged with the barrel 1, and the feeding seat 14 is provided with an inclined feeding hole 17. In other embodiments, the feeding seat 14 is arranged in a split type with the barrel 1, and then integrally connected through a fixed connection.

[0044] As shown in the figure, Figure 4 The barrel cooling section 12 is provided with a segmented barrel cooling structure 5, which includes a plurality of independent cooling cavities 51 distributed along the axial direction of the barrel cooling section 12, and each independent cooling cavity 51 is respectively provided with a cooling liquid inlet 52 and a cooling liquid outlet 53 communicating with the independent cooling cavity 51, and the independent cooling cavity 51 is internally provided with a temperature sensor 6 connected with an external control system signal.

[0045] In use, the cooling liquid inlet 52 and the cooling liquid outlet 53 are respectively connected with an external cooling liquid circulating system. The cooling liquid circulating system can adopt a water cooling system, or a refrigerant cooling liquid system, or different cooling modes can be selected according to actual needs. In this embodiment, the cooling liquid circulating system adopts a water cooling circulating system.

[0046] The segmented barrel cooling structure 5 adopts an axial cooling circulation mode. In other embodiments, the segmented barrel cooling structure 5 adopts a mixed cooling circulation mode.

[0047] Each independent cooling cavity 51 is internally provided with a plurality of axial circulation channels 54. The cooling liquid sequentially passes through the plurality of axial circulation channels 54 through the cooling liquid inlet 52 and is discharged from the cooling liquid outlet 53 after being cooled, thereby achieving cooling of the barrel cooling section 12. The axial cooling circulation mode and the segmented barrel cooling structure can effectively and accurately control the semi-liquid and semi-solid material inside the barrel to be in an original state at all times, without causing changes in the material state due to heat generated during screw conveying, thereby ensuring the physical properties of the semi-liquid and semi-solid material.

[0048] As a preferred solution, the axial circulation channels 54 are formed by internally providing the independent cooling cavity 51 with a partition plate 55 along the axial direction. The independent cooling cavity 51 is divided into a plurality of axial circulation channels 54 with multiple turns of circulation by the partition plate 55. The cooling liquid inlet 52 and the cooling liquid outlet 53 are respectively arranged at different positions of the same end of the barrel cooling section 12, thereby achieving axial cooling circulation of the cooling liquid. In this embodiment, the cooling liquid inlet 52 and the cooling liquid outlet 53 are arranged at different positions of the end facing the injection nozzle.

[0049] The independent cooling cavities 51 are arranged along the axial direction on the barrel cooling section, thereby forming an axial segmented cooling structure. In this embodiment, two independent cooling cavities 51 are arranged on the barrel cooling section 12. As shown in Figure 5 Each independent cooling cavity 51 is internally provided with an axial circulation channel 54 and a temperature sensor 6.

[0050] In other embodiments, the independent cooling cavities 51 can be arranged in three, four, or N, which can be arranged according to the length of the screw barrel and the cooling requirements.

[0051] The injection nozzle 4 integrally includes a nozzle connecting end 41, a nozzle mounting portion 42, and a nozzle injection end 43. The nozzle connecting end 41 is provided with a nozzle external thread 44, and the injection nozzle 4 is threadedly connected with the barrel injection end 11. The nozzle connecting end 41 is internally provided with a feeding cavity 45 that cooperates with the screw head 3. The nozzle injection end 43 is internally provided with an injection hole 46 that communicates with the feeding cavity 45.

[0052] The nozzle mounting portion 42 is arranged at the connection between the nozzle connecting end 41 and the nozzle injection end 43. The nozzle injection end 43 is provided with a nozzle liquid inlet 47 and a nozzle liquid outlet 48 near the nozzle mounting portion 43.

[0053] As shown in Figure 6As shown, the nozzle cooling cavity 40 is provided outside the nozzle injection end 43, and the nozzle cooling cavity 40 is internally provided with an axial partition plate 49, which separates the nozzle cooling cavity 40 into a nozzle axial cooling channel 401. The nozzle cooling cavity 40 is respectively communicated with the nozzle liquid inlet 47 and the nozzle liquid outlet 48. The nozzle cooling cavity 40 is internally provided with a temperature sensor 6 connected with the external control system signal.

[0054] The nozzle cooling cavity 40 adopts an integrated independent cooling structure or a segmented cooling structure. In the embodiment, the nozzle cooling cavity 40 adopts an integrated independent cooling structure. That is, the nozzle cooling cavity 40 is provided on the injection nozzle, and the nozzle cooling cavity 40 is internally provided with multiple folded nozzle axial cooling channels 401. In other embodiments, multiple independent nozzle cooling cavities 40 can be provided on the injection nozzle in an axial direction, for example, two, three or more.

[0055] During the injection molding process, the liquid temperature, for example, the water temperature, of each independent cooling cavity 51 and the nozzle cooling cavity 40 is controlled by the temperature sensor, so as to control the barrel temperature, so that the injection molding machine can adapt to more physical properties of raw materials and meet the needs of injection molding different products.

[0056] Embodiment 2:

[0057] In Figure 7 , Figure 8 , Figure 9 In the embodiment shown, a cooling screw barrel assembly includes a barrel 1, a screw 2, a screw head 3 and an injection nozzle 4. It also includes a plunger 7 and a nozzle seat 8.

[0058] The plunger 7 is internally provided with a plunger cooling cavity 70, and the plunger 7 is provided with a plunger liquid inlet 71 and a plunger liquid outlet 72 communicated with the plunger cooling cavity 70. The plunger cooling cavity 70 is independently provided in an axial direction as one or multiple. The plunger cooling cavity 70 is internally divided into multiple folded plunger axial cooling channels 701. The plunger 7 is provided with a feed inlet 73. The plunger cooling cavity 70 is internally provided with a temperature sensor connected with the external control system signal.

[0059] The injection nozzle 4 is connected with the barrel 1 through the nozzle seat 8. The nozzle seat 8 and the barrel 1 are sealingly connected through a flange.

[0060] The nozzle seat 8 is internally provided with a nozzle seat cooling cavity 80, and the nozzle seat 8 is provided with a nozzle seat liquid inlet 81 and a nozzle seat liquid outlet 82 which are in communication with the nozzle seat cooling cavity 80. The nozzle seat cooling cavity 80 is internally divided into a plurality of nozzle seat axial cooling channels 801, and the nozzle seat cooling cavity 80 is internally provided with a temperature sensor which is signal-connected to an external control system.

[0061] The screw 2 comprises a screw feeding end 21 and a screw connecting end 22, and the screw feeding end 21 is provided with an internally threaded hole 23 at the end thereof.

[0062] The screw head 3 comprises a screw head connecting end 31 and a screw head feeding end 32, and the screw head connecting end 31 is provided with an externally threaded hole 33, and the screw head connecting end 31 is integrally connected to the screw feeding end 21 through the threaded connection.

[0063] The screw head feeding end 32 is integrally provided in a conical structure, and a plurality of pushing arc grooves 34 are arranged on the outer wall of the screw head feeding end 32.

[0064] The barrel 1 comprises an integrally arranged barrel injection end 11, a barrel cooling section 12 and a barrel connecting end 13, and the barrel connecting end 13 is connected to the plunger 7.

[0065] The barrel injection end 11 is connected to the nozzle seat 8 through a flange.

[0066] The barrel cooling section 12 is provided with a segmented barrel cooling structure 5, the segmented barrel cooling structure 5 comprises a plurality of independent cooling cavities 51 which are distributed along the axial direction of the barrel cooling section 12, each independent cooling cavity 51 is respectively provided with a cooling liquid inlet 52 and a cooling liquid outlet 53 which are in communication with the independent cooling cavity 51, and the independent cooling cavity 51 is internally provided with a temperature sensor 6 which is signal-connected to an external control system. In other embodiments, the barrel cooling section 12 is provided with a segmented barrel cooling structure 5, and a double-layer cooling structure of a segmented barrel cooling structure 5 and a spiral cooling channel can also be arranged in the barrel, and the segmented cooling structure is formed together with the plunger 7, the nozzle seat 8 and the injection nozzle 4.

[0067] In use, the cooling liquid inlet 52 and the cooling liquid outlet 53 are respectively connected to an external cooling liquid circulation system. The cooling liquid circulation system can adopt a water cooling system, a refrigerant cooling liquid system or different cooling modes according to actual needs. In this embodiment, the cooling liquid circulation system adopts a water cooling circulation system.

[0068] The segmented barrel cooling structure 5 adopts an axial cooling circulation mode. In other embodiments, the segmented barrel cooling structure 5 adopts a mixed cooling circulation mode.

[0069] Each independent cooling cavity 51 is provided with a plurality of axial circulation channels 54 arranged axially inside. The cooling liquid passes through the plurality of axial circulation channels 54 in sequence to be cooled and then discharged from the cooling liquid outlet 53 through the cooling liquid inlet 52, so as to cool the barrel cooling section 12. The axial cooling circulation mode and the segmented barrel cooling structure can effectively and accurately control the semi-liquid and semi-solid material inside the barrel to be always in the original state, so as to prevent the change of the material state due to the heat generated in the screw conveying process, and to ensure the physical properties of the semi-liquid and semi-solid material.

[0070] As a preferred solution, the axial circulation channel 54 is formed by arranging a partition plate 55 axially inside the independent cooling cavity 51. The independent cooling cavity 51 is divided into a plurality of axial circulation channels 54 with multiple turns of circulation by the partition plate 55. The cooling liquid inlet 52 and the cooling liquid outlet 53 are respectively arranged at different positions of the same end of the barrel cooling section 12, so as to realize the axial cooling circulation of the cooling liquid.

[0071] The independent cooling cavity 51 is arranged along the axis on the barrel cooling section, forming an axial segmented cooling structure. In this embodiment, two independent cooling cavities 51 are arranged on the barrel cooling section 12. Each independent cooling cavity 51 is provided with an axial circulation channel 54 and a temperature sensor 6, respectively.

[0072] In other embodiments, the independent cooling cavity 51 can be provided in three, four or N, which can be set according to the length of the screw barrel and the cooling requirement.

[0073] The injection molding nozzle 4 comprises a nozzle connecting end 41, a nozzle mounting portion 42 and a nozzle injection end 43 arranged integrally, the nozzle connecting end 41 is provided with a nozzle external thread 44, and the injection molding nozzle 4 is threadedly connected with the nozzle seat 8. The inside of the nozzle seat 8 is provided with a feeding cavity 45 matched with the screw head 3. The inside of the nozzle injection end 43 is provided with an injection hole 46 communicating with the feeding cavity 45.

[0074] The nozzle mounting portion 42 is arranged at the connection between the nozzle connecting end 41 and the nozzle injection end 43. The nozzle liquid inlet 47 and the nozzle liquid outlet 48 are arranged at the nozzle injection end 43 close to the nozzle mounting portion 43.

[0075] A nozzle cooling chamber 40 is provided on the injection nozzle 4 outside the nozzle injection end 43. An axial partition 49 is provided inside the nozzle cooling chamber 40, dividing the nozzle cooling chamber 40 into a nozzle axial cooling channel 401. The nozzle cooling chamber 40 is connected to both the nozzle inlet 47 and the nozzle outlet 48. A temperature sensor 6, which is connected to an external control system signal, is provided inside the nozzle cooling chamber 40.

[0076] The nozzle cooling chamber 40 can be an integral, independent cooling structure or a segmented cooling structure. In this embodiment, the nozzle cooling chamber 40 is an integral, independent cooling structure. That is, an independent nozzle cooling chamber 40 is provided on the injection molding nozzle, and multiple folded-back axial cooling channels 401 are provided inside the nozzle cooling chamber 40. In other embodiments, multiple independent nozzle cooling chambers 40 can be provided separately along the axial direction on the injection molding nozzle, for example, two, three or more.

[0077] During the injection molding process, the liquid temperature, such as water temperature, of each plunger cooling chamber 70, independent cooling chamber 51, nozzle seat cooling chamber 80, and nozzle cooling chamber 40 is controlled by temperature sensors, thereby controlling the barrel temperature. This allows the injection molding machine to adapt to more physical properties of raw materials and meet the needs of a wider range of injection-molded products.

[0078] like Figure 10 As shown, the cooled screw barrel assembly is installed in the injection unit via a barrel fixing seat assembly 100 and connected to the injection cylinder assembly 200 to achieve the injection function.

[0079] This cooled screw and barrel assembly is designed to eliminate the need for traditional heating coils. Coolant can be introduced into the barrel assembly, and the barrel temperature is controlled by sensors to regulate the water temperature. This allows the injection molding machine to adapt to a wider range of raw material physical properties, broadening its application range and meeting the injection molding requirements of different products.

[0080] By controlling the water temperature through sensors, and thus the barrel temperature, this method is applied to semi-liquid and semi-solid raw materials. It ensures that the raw material entering the mold maintains its original state and is heated and molded within the mold. The raw material will not lose its required physical and chemical properties due to changes in state within the screw and barrel assembly. This allows the injection molding machine to adapt to a wider range of raw material physical properties.

[0081] The above embodiments are only some embodiments of this utility model, and not all embodiments. Furthermore, based on the embodiments described in this utility model, all other embodiments obtained by those skilled in the art without creative effort and based on the technical solutions of this application should fall within the protection scope of this utility model.

Claims

1. A cooled screw barrel assembly comprising a barrel (1), a screw (2) and an injection nozzle (4), characterized in that: The segmented barrel cooling structure (5) is arranged in the barrel (1), and comprises a plurality of independent cooling cavities (51) distributed along the barrel axis.

2. The cooled screw-cylinder assembly of claim 1, wherein: The segmented barrel cooling structure (5) adopts an axial cooling circulation mode, and each independent cooling cavity (51) is axially provided with a plurality of axial circulation channels (54).

3. The cooled screw-cylinder assembly of claim 1, wherein: The injection nozzle (4) is internally provided with a nozzle cooling cavity (40), and the nozzle cooling cavity (40) is internally provided with a temperature sensor connected with an external control system.

4. The cooled screw-cylinder assembly of claim 3, wherein: The nozzle cooling cavity (40) adopts an integrated independent cooling structure or a segmented cooling structure.

5. The cooled screw-cylinder assembly of claim 3, wherein: The nozzle cooling cavity (40) is internally provided with a plurality of nozzle axial cooling channels (401).

6. The cooled screw barrel assembly of any of claims 1 to 5, wherein: Further comprising a plunger (7) and a nozzle seat (8).

7. The cooled screw-cylinder assembly of claim 6, wherein: The plunger (7) is internally provided with a plunger cooling cavity (70), and the plunger cooling cavity (70) is independently arranged along the axial direction as one or a plurality of independent plunger cooling cavities.

8. The cooled screw-cylinder assembly of claim 7, wherein: The plunger (7) is provided with a plunger liquid inlet (71) and a plunger liquid outlet (72) connected with the plunger cooling cavity (70).

9. The cooled screw-cylinder assembly of claim 6, wherein: The nozzle seat (8) is internally provided with a nozzle seat cooling cavity (80), and the nozzle seat cooling cavity (80) is internally provided with a plurality of nozzle seat axial cooling channels (801).

10. The cooled screw-cylinder assembly of claim 9, wherein: The nozzle seat (8) is provided with a nozzle seat liquid inlet (81) and a nozzle seat liquid outlet (82) connected with the nozzle seat cooling cavity (80).

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