Nozzle assembly and injection molding machine

Abstract

The utility model discloses a nozzle assembly and an injection molding machine, and relates to the technical field of injection molding equipment. The nozzle assembly comprises a nozzle head and a nozzle flange, and the nozzle head is mounted at the end part of the charging barrel through the nozzle flange; the alloy part is arranged between the nozzle head and the nozzle flange, and the alloy part is tightly pressed on the nozzle flange by the nozzle head; and the injection channel penetrates through the nozzle head, the alloy part and the nozzle flange. According to the technical scheme provided by the utility model, the probability that the alloy part is broken due to collision with the forming die can be reduced, and the replacement efficiency of the alloy part is improved.

Description

Technical Field

[0001] This utility model relates to the field of injection molding equipment technology, and in particular to a nozzle assembly and an injection molding machine. Background Technology

[0002] Injection molding machines are molding devices that use molds to form various shapes of plastic products from thermoplastic or thermosetting plastics. During operation, the plastic raw material is melted and injected at high speed into the mold under the pushing force of the screw, passing through the barrel and nozzle assembly. Common nozzle assemblies include a nozzle flange and a nozzle head, with the nozzle head connected to the barrel via the nozzle flange. The nozzle assembly contains embedded alloy parts with high wear resistance to prevent the plastic raw material from rubbing against the inner wall of the nozzle head's orifice during high-speed injection, which could cause the orifice diameter to expand and affect the molding accuracy of the plastic product.

[0003] In existing technologies, during the connection between the nozzle assembly and the molding die, the alloy parts frequently collide with the molding die, leading to breakage. Repairing and replacing these alloy parts is cumbersome and time-consuming. Therefore, there is an urgent need for a new type of nozzle assembly to reduce the probability of alloy parts breaking due to collisions with the molding die and to improve the efficiency of alloy part replacement.

[0004] It should be noted that the above content is only used to help understand the technical solution of this utility model, and does not represent an admission that the above content is prior art. Utility Model Content

[0005] The main purpose of this invention is to provide a nozzle assembly and an injection molding machine, which aims to reduce the probability of alloy parts breaking due to collision with the molding die and to improve the replacement efficiency of alloy parts.

[0006] To achieve the above objectives, this utility model proposes a nozzle assembly, which is applied to an injection molding machine, wherein the injection molding machine includes a barrel;

[0007] Specifically, the nozzle assembly includes:

[0008] The nozzle head and the nozzle flange are mounted to the end of the barrel via the nozzle flange.

[0009] An alloy component is disposed between the nozzle head and the nozzle flange, and the alloy component is pressed tightly against the nozzle flange by the nozzle head.

[0010] The injection channel extends through the nozzle head, the alloy component, and the nozzle flange.

[0011] In one embodiment, the end of the nozzle facing the molding die is defined as the first end face, and the end of the alloy part facing the molding die is defined as the second end face, the second end face being located on the side of the first end face away from the molding die; specifically, the distance between the first end face and the second end face is 0.1~0.3mm.

[0012] In one embodiment, the nozzle flange has an external thread on the side away from the nozzle head, and the end of the barrel has an internal thread. The external thread and the internal thread are threaded together to connect the nozzle flange and the barrel.

[0013] In one embodiment, the nozzle flange has at least two threaded holes on the side facing the nozzle head, and the at least two threaded holes are equidistantly distributed in a ring around the axis of the nozzle flange; the nozzle head has a plurality of mounting holes, and the mounting holes are correspondingly arranged with the threaded holes; the nozzle assembly further includes a fixing bolt, which is used to pass through the mounting holes and be threadedly connected to the threaded holes, so that the nozzle head and the nozzle flange are connected to each other.

[0014] In one embodiment, the mounting hole has a countersunk portion at one end away from the threaded hole, the countersunk portion being used to accommodate the bolt head of the fixing bolt.

[0015] In one embodiment, the nozzle flange has a recessed mounting portion in the middle, and at least a portion of the alloy component is embedded and connected to the mounting portion; the nozzle head is used to apply a force to the alloy component in the direction of the mounting portion.

[0016] In one embodiment, the alloy component has an abutment surface on the side facing the nozzle head; when the nozzle head is connected to the nozzle flange, the nozzle head abuts against the alloy component through the abutment surface, and the nozzle head applies a force to the alloy component in the direction of the mounting portion through the abutment surface.

[0017] In one embodiment, the alloy component is made of tungsten alloy.

[0018] In one embodiment, the nozzle flange is provided with a guide channel, and the injection channel is connected to the inner cavity of the barrel through the guide channel; wherein the injection channel and the guide channel are coaxially arranged.

[0019] In one embodiment, the guide channel has a tapered structure, with the end of the guide channel having a relatively large aperture connected to the material cylinder, and the end of the guide channel having a relatively small aperture connected to the injection channel.

[0020] To achieve the above objectives, this utility model proposes an injection molding machine, which includes the nozzle assembly described in any of the above claims.

[0021] The technical solution of this utility model involves placing the alloy component between the nozzle head and the nozzle flange, thus preventing the alloy component from being exposed. This avoids collisions between the alloy component and the molding die due to its lack of exposure, thereby reducing the probability of breakage. Furthermore, in this application, the alloy component is pressed tightly against the nozzle flange by the nozzle head. Understandably, when maintenance or replacement of the alloy component is required, simply separating the nozzle head and the nozzle flange is sufficient. The alloy component, lacking the clamping force of the nozzle head, naturally releases its fixed connection with both. Then, the operator can directly remove and replace the alloy component from either the nozzle head or the nozzle flange. This simple and time-saving operation significantly improves the efficiency of alloy component replacement. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A schematic diagram of the structure of an embodiment of the nozzle assembly provided by this utility model;

[0024] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

[0025] Figure 3 An exploded view of an embodiment of the nozzle assembly provided by this utility model;

[0026] Figure 4 A three-dimensional structural schematic diagram of an embodiment of the nozzle assembly provided by this utility model;

[0027] Figure 5 A stress analysis diagram of the alloy component in one embodiment of the nozzle assembly provided by this utility model.

[0028] Explanation of reference numerals in the attached figures:

[0029] 100. Nozzle assembly; 110. Nozzle flange; 111. Guide channel; 112. External thread; 113. Threaded hole; 114. Mounting part; 120. Nozzle head; 121. Mounting hole; 122. Countersunk part; 124. First end face; 130. Alloy part; 131. Injection channel; 132. Second end face; 133. Abutment surface; 200. Barrel; 210. Internal thread;

[0030] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0031] The technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, what is described is only a part of the embodiments of this utility model, and not all of the embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0032] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0033] Furthermore, it should be noted that the descriptions involving "first," "second," etc., in this utility model are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0034] In existing technologies, during the connection between the nozzle assembly and the molding die, the alloy parts frequently collide with the molding die, leading to breakage. Repairing and replacing these alloy parts is cumbersome and time-consuming. Therefore, there is an urgent need for a new type of nozzle assembly to reduce the probability of alloy parts breaking due to collisions with the molding die and to improve the efficiency of alloy part replacement.

[0035] To solve the above-mentioned technical problems, this utility model proposes a nozzle assembly.

[0036] Please see Figure 1-4 In one embodiment of the present invention, the nozzle assembly 100 is applied to an injection molding machine, wherein the injection molding machine includes a barrel 200;

[0037] Specifically, the nozzle assembly 100 includes:

[0038] The nozzle head 120 and the nozzle flange 110 are mounted on the end of the barrel 200 via the nozzle flange 110; the nozzle head 120 is used to connect with the molding die.

[0039] Alloy part 130 is disposed between nozzle head 120 and nozzle flange 110, and alloy part 130 is pressed tightly against nozzle flange 110 by nozzle head 12.

[0040] Injection channel 131 extends through nozzle head 120, alloy part 130 and nozzle flange 110 to allow plastic raw material to be injected into molding die through injection channel 131.

[0041] The technical solution of this utility model involves placing the alloy part 130 between the nozzle head 120 and the nozzle flange 110, thus preventing the alloy part 130 from being exposed. This avoids collisions between the alloy part 130 and the molding die due to its lack of exposure, thereby reducing the probability of breakage. Furthermore, in this application, the alloy part 130 is pressed tightly against the nozzle flange 110 by the nozzle head 120. Understandably, when maintenance or replacement of the alloy part 130 is required, simply separating the nozzle head 120 from the nozzle flange 110 will release the alloy part 130 from the fixed connection due to the absence of the pressing force from the nozzle head 120. Then, the operator can directly remove and replace the alloy part 130 from either the nozzle head 120 or the nozzle flange 110. This simple and time-saving operation improves the replacement efficiency of the alloy part 130.

[0042] The aforementioned alloy part 130 is made of tungsten alloy, which is an alloy composed of tungsten as the base material and other elements. Tungsten alloy, as a high-hardness, high-melting-point metallic material, has a hardness characteristic between HRC40 and HRC55, and some specific compositions of tungsten alloy can even reach HRC65. This gives it significant advantages in the manufacture of cemented carbides, special steels, and other fields. In this embodiment, tungsten alloy is used to manufacture alloy part 130 to ensure that the inner wall of the injection channel 131 of alloy part 130 will not be worn due to the high-speed injection of plastic raw materials.

[0043] As a preferred embodiment of the above, the end of the nozzle head 120 facing the molding die is defined as the first end face 124, and the end of the alloy part 130 facing the molding die is defined as the second end face 132. The second end face 132 is located on the side of the first end face 124 away from the molding die; specifically, the distance between the first end face 124 and the second end face 132 is 0.1~0.3mm. This configuration, by limiting the second end face 132 of the alloy part 130 to the side of the first end face 124 of the nozzle head 120 away from the molding die (i.e., the second end face 132 of the alloy part 130 is recessed within the first end face 124 of the nozzle head 120), ensures that the alloy part 130 will not collide with the molding die, thereby effectively reducing the probability of the alloy part 130 breaking due to collision with the molding die. In this embodiment, the distance between the first end face 124 and the second end face 132 is set to 0.1~0.3mm.

[0044] As a preferred embodiment, the nozzle flange 110 has an external thread 112 on the side away from the nozzle head 120, and the end of the barrel 200 has an internal thread 210. The external thread 112 and the internal thread 210 are threadedly connected to each other, so that the nozzle flange 110 and the barrel 200 are connected to each other. This arrangement, with the external thread 112 and the internal thread 210 threadedly connected to each other, makes the nozzle flange 110 and the barrel 200 simple in structure and highly practical.

[0045] As a preferred embodiment of the above, the nozzle flange 110 has at least two threaded holes 113 on the side facing the nozzle head 120, and the at least two threaded holes 113 are equidistantly distributed in a ring around the axis of the nozzle flange 110; the nozzle head 120 has a plurality of mounting holes 121, and the mounting holes 121 are correspondingly arranged with the threaded holes 113; the nozzle assembly 100 also includes fixing bolts, which are used to pass through the mounting holes 121 and be threadedly connected to the threaded holes 113, so that the nozzle head 120 and the nozzle flange 110 are connected to each other. This arrangement, using fixing bolts passing through the mounting holes 121 and being threadedly connected to the threaded holes 113 to connect the nozzle head 120 and the nozzle flange 110, results in a simple structure and strong practicality; at the same time, the presence of at least two threaded holes 113 equidistantly distributed in a ring around the axis of the nozzle flange 110 improves the firmness between the nozzle head 120 and the nozzle flange 110 after the fixing bolts are installed, preventing loosening between the nozzle head 120 and the nozzle flange 110 during the injection molding process. In this embodiment, the number of threaded holes 113 is set to four.

[0046] Furthermore, the end of the mounting hole 121 away from the threaded hole 113 is provided with a countersunk portion 122, which is used to accommodate the bolt head of the fixing bolt. This design is to prevent the bolt head of the fixing bolt from colliding with the molding die due to protrusion from the nozzle head 120 during the connection process between the nozzle head 120 and the molding die, thus avoiding damage to the molding die and its equipment. In this embodiment, the countersunk portion 122 is provided to accommodate the bolt head of the fixing bolt, thereby preventing the bolt head of the fixing bolt from colliding with the molding die due to protrusion from the nozzle head 120.

[0047] As a preferred embodiment of the above embodiment, the nozzle flange 110 has a recessed mounting portion 114 in the middle, and at least a portion of the alloy part 130 is embedded and connected to the mounting portion 114; the nozzle head 120 is used to apply a force to the alloy part 130 in the direction of the mounting portion 114. With this configuration, during the installation process of the alloy part 130, the alloy part 130 is first embedded into the mounting portion 114 of the nozzle flange 110, and the mounting portion 114 is used to pre-position the alloy part 130; then the nozzle head 120 is used to apply a force to the alloy part 130 in the direction of the mounting portion 114 to ensure that the alloy part 130 is firmly installed in the mounting portion 114, thereby realizing the installation and fixation of the alloy part 130. The above embodiment has a simple structure and strong practicality.

[0048] Furthermore, the alloy part 130 has an abutment surface 133 on the side facing the nozzle head 120. When the nozzle head 120 is connected to the nozzle flange 110, the nozzle head 120 abuts against the alloy part 130 through the abutment surface 133, and the nozzle head 120 applies a force to the alloy part 130 in the direction of the mounting portion 114 through the abutment surface 133. With this configuration, when the nozzle head 120 is connected to the nozzle flange 110, the abutment surface 133 of the nozzle head abuts against the alloy part 130, allowing the nozzle head 120 to apply a force to the alloy part 130 in the direction of the mounting portion 114 through the abutment surface 133. Since the installation of the alloy part 130 does not require the use of connecting screws or other fixing parts, this effectively simplifies the installation steps of the alloy part 130, thereby improving the installation efficiency of the alloy part 130.

[0049] In this embodiment, the contact surface 133 has a beveled structure, and the angle α between the contact surface 133 and the injection direction of the plastic material is set at an acute angle. This configuration ensures that the resultant force F exerted by the nozzle head 120 on the alloy part 130 through the contact surface 133 is... 合 The direction is perpendicular to the contact surface 133 and towards the inside of the alloy part 130, and the resultant force F is determined by trigonometric functions. 合By decomposing the components, we can obtain a first vertical force f1 and a second horizontal force f2. The direction of the second force f2 is towards the mounting part 114. Therefore, the second force f2 is the force applied to the alloy part 130 in the direction of the mounting part 114.

[0050] As a preferred embodiment of the above, the nozzle flange 110 is provided with a guide channel 111, and the injection channel 131 is connected to the inner cavity of the barrel 200 through the guide channel 111; wherein the injection channel 131 and the guide channel 111 are coaxially arranged. This arrangement allows the plastic raw material to flow smoothly from the guide channel 111 to the injection channel 131 along the same axis, reducing the pressure loss of the plastic raw material flowing from the guide channel 111 to the injection channel 131, thereby maintaining sufficient pressure for injection into the molding die.

[0051] Furthermore, the guide channel 111 has a tapered structure. The end of the guide channel 111 with a relatively large aperture is connected to the material cylinder 200, and the end of the guide channel 111 with a relatively small aperture is connected to the injection channel 131. With this configuration, when the plastic raw material flows through the tapered guide channel 111, the pressure value of the plastic raw material can be effectively increased, thereby ensuring that the plastic raw material is injected into the molding die under sufficient pressure, thus ensuring the molding quality of the plastic product.

[0052] This embodiment also discloses an injection molding machine, including the nozzle assembly of any of the above embodiments. The specific structure of the nozzle assembly can be found in the above embodiments. Since this injection molding machine adopts all the technical solutions of all the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be elaborated further here.

[0053] It should be noted that the nozzle assembly and other contents of the injection molding machine disclosed in this utility model are existing technologies and will not be described in detail here.

[0054] The above are merely optional embodiments of this utility model and do not limit the patent scope of this utility model. Any application of this utility model directly or indirectly in other related technical fields is included within the patent protection scope of this utility model.

Claims

1. A nozzle assembly for use in an injection molding machine, wherein the injection molding machine includes a barrel; characterized in that, The nozzle assembly includes: The nozzle head and the nozzle flange are mounted to the end of the barrel via the nozzle flange. An alloy component is disposed between the nozzle head and the nozzle flange, and the alloy component is pressed tightly against the nozzle flange by the nozzle head. The injection channel extends through the nozzle head, the alloy component, and the nozzle flange.

2. The nozzle assembly as claimed in claim 1, characterized in that: The end of the nozzle facing the molding die is defined as the first end face, and the end of the alloy part facing the molding die is defined as the second end face. The second end face is located on the side of the first end face away from the molding die. Specifically, the distance between the first end face and the second end face is 0.1~0.3mm.

3. The nozzle assembly as described in claim 1, characterized in that: The nozzle flange has an external thread on the side away from the nozzle head, and the end of the barrel has an internal thread. The external thread and the internal thread are threaded together to connect the nozzle flange and the barrel.

4. The nozzle assembly as claimed in claim 1, characterized in that: The nozzle flange has at least two threaded holes on the side facing the nozzle head, and the at least two threaded holes are equidistantly distributed in a ring around the axis of the nozzle flange; the nozzle head has a plurality of mounting holes, and the mounting holes are correspondingly arranged with the threaded holes; the nozzle assembly also includes a fixing bolt, which is used to pass through the mounting holes and be threadedly connected to the threaded holes, so that the nozzle head and the nozzle flange are connected to each other.

5. The nozzle assembly as described in claim 4, characterized in that: The mounting hole has a countersunk portion at one end away from the threaded hole, which is used to accommodate the bolt head of the fixing bolt.

6. The nozzle assembly as claimed in claim 1, characterized in that: The nozzle flange has a recessed mounting portion in the middle, and at least a portion of the alloy part is embedded and connected to the mounting portion; the nozzle head is used to apply a force to the alloy part in the direction of the mounting portion.

7. The nozzle assembly as claimed in claim 6, characterized in that: The alloy component has an abutment surface on the side facing the nozzle head; when the nozzle head is connected to the nozzle flange, the nozzle head abuts against the alloy component through the abutment surface, and the nozzle head applies a force to the alloy component in the direction of the mounting part through the abutment surface.

8. The nozzle assembly as claimed in claim 1, characterized in that: The alloy component is made of tungsten alloy.

9. The nozzle assembly as claimed in claim 1, characterized in that: The nozzle flange is provided with a guide channel, and the injection channel is connected to the inner cavity of the barrel through the guide channel; wherein the injection channel and the guide channel are coaxially arranged. Furthermore, the guide channel has a tapered structure, with the end of the guide channel having a relatively large aperture connected to the material cylinder, and the end of the guide channel having a relatively small aperture connected to the injection channel.

10. An injection molding machine, characterized in that: The injection molding machine includes the nozzle assembly as described in any one of claims 1 to 9.

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