Material nozzle assembly

Abstract

The material nozzle assembly is used for conveying forming materials to a mold through an injection machine and comprises a material nozzle shell and a material nozzle, the material nozzle shell is installed on the injection machine, an installation cavity is formed in the material nozzle shell and comprises a first cavity and a second cavity which are sequentially arranged from top to bottom, and at least part of the inner circumferential face of the first cavity is a spherical surface; the material nozzle comprises a mounting part and an injection part, the peripheral surface of the mounting part is matched with the spherical surface of the first cavity, and the mounting part is used for mounting the material nozzle in the material nozzle shell; and an injection cavity is further formed in the material nozzle, penetrates through the mounting part and the injection part and is used for conveying a forming material. According to the material nozzle assembly, the material nozzle can rotate by a certain angle in the material nozzle shell, the material nozzle and the sprue bush are in tight surface contact all the time, the sealing effect is guaranteed, and leakage of a forming material during injection is effectively prevented.

Description

Technical Field

[0001] The present application relates to the field of injection nozzles of rubber injection machines, and particularly to a nozzle assembly. Background Art

[0002] During the injection production process of rubber, the injection machine is connected to the sprue bushing of the mold through a nozzle assembly to inject the rubber in the injection machine into the mold. Traditional nozzle assemblies generally adopt a fixed structure, that is, including a nozzle and a nozzle housing connected by threads, and the nozzle assembly is installed by threadedly connecting the nozzle housing to the cold runner of the injection machine. When one end of the nozzle housing is screwed into the cold runner, due to production defects such as thread skew or operational errors such as misalignment of the threads, the installed nozzle and the cold runner will not be on the same axis, that is, the nozzle is skewed, which will further result in only point contact when the nozzle is assembled with the sprue bushing, unable to produce line contact and surface contact, and the sealing effect is poor, thus resulting in leakage of rubber from the connection between the nozzle and the sprue bushing during injection. At the same time, it is difficult to control the depth of the nozzle housing screwed into the cold runner. If the screwing depth is insufficient, the nozzle housing will loosen or fall off, resulting in connection failure; if the screwing depth is too large, the length of the nozzle housing extending out of the cold runner is insufficient, which will further result in the inability to tightly connect the nozzle and the sprue bushing, and leakage of glue is likely to occur during injection.

[0003] Currently, although the nozzle of the existing floating nozzle assembly can make a certain linear movement along the axial direction in the nozzle housing, the nozzle of this type of structure usually has point contact with the sprue bushing, and the sealing effect is poor, that is, the problem of nozzle skew cannot be solved, and leakage of glue is likely to occur during the injection process due to the influence of injection pressure. Summary of the Utility Model

[0004] Aiming at the deficiencies of the prior art, the main purpose of the present application is to provide a nozzle assembly in which the nozzle can rotate at a certain angle in the nozzle housing, ensuring that there is always tight surface contact between the nozzle and the sprue bushing, ensuring the sealing effect, and effectively preventing leakage of the molding material during injection.

[0005] To solve the above technical problems, the technical solution adopted by the present application is: a nozzle assembly for an injection machine to convey a molding material to a mold. The nozzle assembly includes a nozzle housing and a nozzle. The nozzle housing is installed on the injection machine. An installation cavity is provided in the nozzle housing. The installation cavity includes a first cavity and a second cavity that are communicated. At least part of the inner peripheral surface of the first cavity is a spherical surface. The nozzle includes an installation part and an injection part. The outer peripheral surface of the installation part matches the spherical surface of the first cavity and is used to install the nozzle in the nozzle housing. An injection cavity is also provided in the nozzle, and the injection cavity penetrates through the installation part and the injection part and is used to convey the molding material. The two spherical surfaces match each other, enabling the nozzle to rotate at a certain angle in the nozzle housing, thereby ensuring surface contact between the nozzle and the sprue bushing.

[0006] Among them, an external thread is provided on the outer wall of the nozzle housing, and an internal thread is provided on the inner wall of the cold runner of the injection molding machine. The nozzle housing and the cold runner are connected by threads.

[0007] Among them, both the first cavity and the second cavity are cylindrical cavities. The diameter of the first cavity is larger than that of the second cavity, and the inner peripheral surface of the bottom of the first cavity is a spherical surface. The spherical surface enables a smooth transition between the first cavity and the second cavity.

[0008] Among them, the injection cavity includes a connected third cavity and a fourth cavity. The third cavity is an inverted frustum-shaped cavity, and the fourth cavity is a cylindrical cavity. The diameter of the lower end of the third cavity is equal to the diameter of the fourth cavity, so that the injection cavity has no stepped structure as a whole, the molding material is smoothly conveyed, and it is not easy to get stuck in the injection cavity.

[0009] Among them, the nozzle assembly further includes a sprue bushing. The sprue bushing is provided with a fifth cavity, and the end of the injection part extending out of the nozzle housing is connected to the sprue bushing in a matching manner.

[0010] Among them, the lower end surface of the injection part is a plane, and the upper end surface of the sprue bushing is a plane. The lower end surface of the injection part abuts against the upper end surface of the sprue bushing, and the injection cavity is aligned with the fifth cavity.

[0011] Among them, a part of the outer peripheral surface at the lower end of the injection part is a first conical surface, and a part of the inner peripheral surface at the upper end of the fifth cavity is a second conical surface. The lower end of the injection part extends into the fifth cavity and the first conical surface abuts against the second conical surface. This makes the injection part and the sprue bushing always located on the same axis, effectively preventing the injection part from shifting during the injection process, resulting in the molding material overflowing from the nozzle assembly.

[0012] Among them, the nozzle assembly further includes a snap ring. An installation groove is provided on the outer peripheral surface of the first cavity, and the installation groove is located above the spherical surface. The snap ring is clamped in the installation groove. The snap ring is used to limit the nozzle in the nozzle housing.

[0013] Among them, the nozzle assembly further includes a buffer member. The buffer member is arranged in the first cavity, and the buffer member is arranged between the snap ring and the nozzle.

[0014] Among them, the buffer member is made of polytetrafluoroethylene or aramid.

[0015] The beneficial effect of this application is that in the nozzle assembly of this application, the installation part can be closely attached to the spherical surface of the first cavity, and the matching spherical surface enables the nozzle to rotate at a certain angle in the nozzle housing, so that the nozzle always maintains a vertical state and has a close surface contact with the sprue bushing, effectively avoiding the molding material from overflowing from the connection between the nozzle and the sprue bushing, thereby avoiding material waste and increased production costs.

[0016] Meanwhile, a snap ring is provided above the nozzle tip, and there is a certain distance between the upper end of the nozzle tip and the snap ring, allowing the nozzle tip to have space for vertical movement within the nozzle housing. As a result, the nozzle tip can adaptively adjust its axial height within a certain range according to the depth change of the nozzle housing screwed into the cold runner, ensuring that the nozzle tip always maintains a tight connection with the sprue bushing. The snap ring can limit the maximum upward movement distance of the nozzle tip, preventing the large injection reaction force during abnormal injection from causing the nozzle tip to continuously move upward and fail to press tightly against the sprue bushing, thus avoiding more material waste.

[0017] In addition, through the cooperation of the first conical surface and the second conical surface, the injection part of the nozzle tip can extend into the sprue bushing and make full contact with the sprue bushing, achieving line sealing and effectively preventing the molding material from overflowing from the connection between the nozzle tip and the sprue bushing due to the offset of the injection part during the injection process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings. Among them:

[0019] Figure 1 is a schematic structural diagram of the nozzle assembly 100 in an embodiment of the present application;

[0020] Figure 2 is a cross-sectional view of the nozzle assembly 100 in an embodiment of the present application;

[0021] Figure 3 is Figure 2 an enlarged view of part A in

[0022] Figure 4 is a schematic structural diagram of the nozzle 300 installed in the nozzle housing 200 in an embodiment of the present application;

[0023] Figure 5 is a cross-sectional view of the nozzle assembly 100 in another embodiment of the present application;

[0024] Figure 6 is Figure 5 an enlarged view of part B in

[0025] Figure 7 is a schematic structural diagram of the nozzle 300 installed in the nozzle housing 200 in another embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0027] Referring to Figures 1 to 4 , a nozzle assembly 100 is used for an injection molding machine to convey molding materials to a mold. The nozzle assembly 100 includes a nozzle housing 200 and a nozzle 300. During injection, the molding materials flow through the cold runner of the injection molding machine and the nozzle assembly 100 in sequence and then flow to the mold. For the convenience of description, the injection flow direction of the molding materials is defined as the X direction. In the actual application process of the nozzle assembly 100, the injection flow direction X is usually from top to bottom, that is Figure 1 the left side in corresponds to the upper side in actual application, and the right side corresponds to the lower side in actual application. The following description will directly use the directions in actual application. The nozzle housing 200 is installed on the injection molding machine. An installation cavity is formed in the nozzle housing 200. The installation cavity includes a first cavity 210 and a second cavity 220 that are communicated. And the first cavity 210 is close to the upper end of the nozzle assembly 100. At least part of the inner peripheral surface of the first cavity 210 is a spherical surface. The nozzle 300 includes an installation portion 310 and an injection portion 320. The outer peripheral surface of the installation portion 310 matches the spherical surface of the first cavity 210 and is used to install the nozzle 300 in the nozzle housing 200. The injection portion 320 extends out of the second cavity 220; an injection cavity is also formed in the nozzle 300. The injection cavity penetrates through the installation portion 310 and the injection portion 320 and is used to convey the molding materials. The injection cavity of the nozzle 300 includes a communicated third cavity 330 and a fourth cavity 340. The third cavity 330 is a frustum-shaped cavity with a larger top and a smaller bottom, and the fourth cavity 340 is a cylindrical cavity. The third cavity 330 is located above the fourth cavity 340 so that the injection cavity as a whole has a funnel structure.

[0028] The nozzle assembly 100 further includes a sprue bushing 400. The injection part 320 extends out of the end of the nozzle housing 200 and is cooperatively connected with the sprue bushing 400. The sprue bushing 400 is provided with a fifth cavity 410 which penetrates through the sprue bushing 400 vertically. The fifth cavity 410 is a conical cavity, the diameter of its upper end is smaller than that of its lower end, and the diameter of the fifth cavity 410 gradually increases from top to bottom. After injection, the fifth cavity 410 is likely to remain with the solidified molding material. The conical cavity has a larger diameter at its lower end, which is convenient for quickly cleaning the molding material. The diameter of the uppermost end of the fifth cavity 410 is larger than that of the fourth cavity 340, so that the opening of the fourth cavity 340 can be completely butted within the opening range of the fifth cavity 410, that is, the injection cavity is aligned with the fifth cavity 410, which is convenient for all the molding material to be conveyed from the nozzle 300 to the sprue bushing 400, and avoids the overflow of the molding material from the interface, resulting in material waste; the diameter of the uppermost end of the fifth cavity 410 is smaller than the outer diameter of the injection part 320, so that the injection part 320 can abut against the upper end of the sprue bushing 400; the lower end surface of the injection part 320 and the upper end surface of the sprue bushing 400 are both smooth planes, so that when the injection part 320 abuts against the sprue bushing 400, the two can achieve a close surface contact, that is, there is no gap between the lower end surface of the nozzle 300 and the upper end surface of the sprue bushing 400. Compared with point contact, the sealing area of surface contact is larger and the sealing effect is better, which can effectively prevent the molding material from overflowing from the connection between the two, resulting in material waste.

[0029] In the nozzle assembly 100, the installation part 310 can be closely attached to the spherical surface of the first cavity 210, and the mutually matching spherical surfaces enable the nozzle 300 to rotate at a certain angle in the nozzle housing 200. Even if the nozzle housing 200 is skewed, the nozzle 300 can rotate in the nozzle housing 200 to adjust the angle and maintain the vertical state of the nozzle 300.

[0030] The nozzle housing 200 is fixedly connected to the cold runner of the injection molding machine. Specifically, a part of the nozzle housing 200 is inserted into the cold runner. The outer wall of the top of one end of the nozzle housing 200 located in the cold runner is provided with an external thread, and the inner wall of the cold runner is correspondingly provided with a matching internal thread. The nozzle housing 200 and the cold runner are fixedly connected by threads, and the other end of the nozzle housing 200 extends out of the cold runner.

[0031] The main structures of the first cavity 210 and the second cavity 220 of the nozzle housing 200 are both cylindrical cavities. The first cavity 210 and the second cavity 220 communicate with each other and penetrate through the nozzle housing 200 along the axial direction of the nozzle housing 200. The diameter of the first cavity 210 is larger than that of the second cavity 220. The inner peripheral surface of the bottom of the first cavity 210 is a spherical surface, and the spherical surface makes the outer peripheral surfaces of the first cavity 210 and the second cavity 220 transition smoothly.

[0032] The installation part 310 of the nozzle 300 is hemispherical, and its outer peripheral surface matches the spherical surface of the first cavity 210, that is, the installation part 310 can be closely attached to the spherical surface at the bottom of the first cavity 210. In this way, when the nozzle 300 is installed in the nozzle housing 200, the installation part 310 can be tightly connected to the nozzle housing 200 under the action of gravity, so that the nozzle 300 is embedded in the nozzle housing 200. At this time, there is a certain distance between the upper end surface of the installation part 310 and the upper end surface of the nozzle housing 200, that is, the nozzle 300 has a certain up and down movement space in the nozzle housing 200. Furthermore, the nozzle 300 can adaptively adjust the axial height within a certain range according to the change in the depth of the nozzle housing 200 screwed into the cold runner, so that the nozzle 300 and the sprue bushing 400 are always kept in tight connection.

[0033] In this embodiment, the diameters of the cross-sections of the installation part 310 at different horizontal heights are different. Among them, the diameter of the cross-section at the uppermost end of the installation part 310 is the largest and is equal to the upper end diameter of the spherical surface of the first cavity 210. That is, when the nozzle 300 is installed in the nozzle housing 200, the outer periphery of the installation part 310 can be closely attached to the inner wall of the first cavity 210, so that all the molding materials flowing into the nozzle housing 200 in the injection machine flow into the nozzle 300, avoiding the leakage of the molding materials from the connection between the nozzle housing 200 and the upper end of the nozzle 300 and causing material waste. At the same time, it also further avoids the leakage pressure generated at the connection between the nozzle housing 200 and the nozzle 300 from causing the nozzle 300 to move upward, resulting in the inability of the lower end of the nozzle 300 to be tightly connected to the sprue bushing 400 and causing more material waste. In other embodiments, the largest cross-sectional diameter of the installation part may not be located at the uppermost end of the installation part, as long as it can avoid the leakage of the molding materials from the connection between the nozzle housing and the upper end of the nozzle, and there is no limitation here.

[0034] The injection part 320 of the nozzle 300 is a cylindrical tubular structure, and its outer diameter is smaller than the diameter of the second cavity 220, so that one end of the injection part 320 that is not connected to the installation part 310 can penetrate the nozzle housing 200; the length of the injection part 320 is greater than the length of the second cavity 220, so that one end of the injection part 320 that is not connected to the installation part 310 can extend out of the nozzle housing 200, and the end of the injection part 320 extending out of the nozzle housing 200 is used for mating connection with the sprue bushing 400.

[0035] During the injection process, when the molding material passes through the third cavity 330 from top to bottom in the X direction, the injection area gradually decreases from top to bottom, so that the injection pressure gradually increases, which can firmly press the lower end of the injection part 320 of the nozzle 300 against the upper end of the sprue bushing 400, effectively preventing the leakage of the molding material from the connection between the nozzle 300 and the sprue bushing 400 and avoiding material waste. The diameter of the lower end of the third cavity 330 is equal to the diameter of the fourth cavity 340, so that the overall injection cavity has no stepped structure, the molding material is smoothly transported, and it is not easy to appear jamming phenomena.

[0036] In the present embodiment, since the mounting portion 310 and the first cavity 210 both include spherical surfaces, and the outer diameter of the injection portion 320 is smaller than the diameter of the second cavity 220, that is, the nozzle 300 can rotate at a certain angle in the nozzle shell 200, even if the nozzle 300 is tilted so that it is in point contact with the gate sleeve 400, when the molding material is injected through the frustum-shaped third cavity 330, the injection pressure gradually increases, prompting the nozzle 300 to gradually rotate and adjust in the nozzle shell 200 so that the mounting portion 310 is tightly fitted with the spherical surface of the first cavity 210, thereby restoring the nozzle 300 to a vertical state, thereby restoring the nozzle 300 and the gate sleeve 400 from point contact to surface contact, thereby avoiding more material waste.

[0037] The nozzle assembly 100 further includes a circlip 110. A mounting groove 211 is provided on the outer circumferential surface of the first cavity 210. The circlip 110 can be clamped in the mounting groove 211 using circlip pliers. The circlip 110 is a semi-enclosed annular structure with one side open. The outer diameter of the semi-enclosed annular structure is larger than the inner diameter of the mounting groove 211. The circlip 110 has a certain elastic deformation capacity. After the circlip 110 is clamped, a closed annular structure can be formed. The outer diameter of the closed annular structure is smaller than the inner diameter of the first cavity 210. The ring width of the circlip 110 is slightly larger than the groove depth of the mounting groove 211. Through holes are provided at the two ends of the opening side of the circlip 110 for cooperating with the circlip pliers to realize the installation of the circlip. When installing the circlip 110, insert the pliers of the circlip pliers into the corresponding through hole on the circlip and tighten the circlip pliers, the circlip 110 is compressed from a semi-closed state to form a closed ring structure, and then the compressed circlip pliers are used to install the circlip 110 into the installation groove 211, and finally the circlip pliers are loosened, and the circlip 110 restores the semi-closed ring structure, so that the circlip 110 is stuck in the installation groove 211 and partially protrudes from the installation groove 211, so as to provide an axial limit for the first cavity 210. The circlip 110 is installed above the nozzle 300, which can limit the maximum height of the nozzle 300 moving upward, and prevent the leaked molding material from generating an upward reaction force on the nozzle 300 when the molding material leaks from the connection between the injection part 320 and the sprue bushing 400 during the injection process, causing the nozzle 300 to continue to move upward, and even causing the nozzle 300 to separate from the nozzle shell 200, affecting the injection production process. In addition, since the retaining spring 110 has a certain elastic deformation ability and its outer diameter in the semi-closed state is larger than the inner diameter of the mounting groove 211, when the retaining spring 110 is clamped in the mounting groove 211, the retaining spring 110 cannot completely restore its initial semi-closed state. It will generate radial extrusion force on the mounting groove 211 and form a close surface contact with the bottom of the mounting groove 211, so that the retaining spring 110 can be firmly clamped in the mounting groove 211, ensuring the limiting effect, and the assembly and disassembly are convenient and quick.

[0038] In this embodiment, the installation groove 211 is located above the spherical surface of the first cavity 210, and there is a certain distance between the installation groove 211 and the spherical surface of the first cavity 210, so that there is a certain distance between the upper end of the nozzle 300 and the snap ring 110. Furthermore, there is a space for the nozzle 300 to move up and down in the nozzle housing 200, enabling the nozzle 300 to adapt to the axial height. That is, when the depth of screwing the nozzle housing 200 into the cold runner is insufficient, resulting in the nozzle 300 extending too long from the nozzle housing 200, at this time, the nozzle 300 can move up a corresponding height in the nozzle housing 200, thereby shortening the extending length of the nozzle 300, so that the nozzle 300 maintains a close surface contact with the sprue bushing 400, avoiding material waste caused by the molding material overflowing between the nozzle 300 and the sprue bushing 400.

[0039] Furthermore, the nozzle assembly 100 further includes a buffer member 120. The buffer member 120 is disposed in the first cavity 210 and is located between the snap ring 110 and the nozzle 300. The buffer member 120 is a buffer ring, which can buffer the impact force of the nozzle 300 suddenly moving up on the snap ring 110, playing a pressure-reducing role, avoiding direct collision and wear between the two, and extending the service life of the nozzle 300 and the snap ring 110. The buffer member 120 is made of polytetrafluoroethylene or aramid, with stable performance and excellent heat resistance, corrosion resistance and self-lubrication.

[0040] Refer to Figures 5 to 7 , in another embodiment, a part of the outer peripheral surface at the lower end of the injection part 320 is a conical surface, that is, the outer diameter of a part of the structure at the lower end of the injection part 320 gradually decreases from top to bottom. That is, the outer diameter of the lowermost end of the injection part 320 is smaller than the outer diameter of the upper end of the injection part 320. This conical surface is defined as the first conical surface 321, and the first conical surface 321 is an external conical surface; a part of the inner peripheral surface of the upper end of the fifth cavity 410 that cooperates with the injection part 320 is also a conical surface, that is, the inner diameter of a part of the structure at the upper end of the fifth cavity 410 gradually decreases from top to bottom. The inner diameter of the opening at the uppermost end of the fifth cavity 410 is larger than the inner diameter of the lower end of the fifth cavity 410. This conical surface is defined as the second conical surface 411, and the second conical surface 411 is an internal conical surface; the inner diameter at the lower end of the second conical surface of the fifth cavity 410 matches the outer diameter at the lower end of the first conical surface 321 of the injection part 320, so that the injection part 320 can extend into the fifth cavity 410 and the first conical surface 321 abuts against the second conical surface 411. When the injection part 320 is assembled with the sprue bushing 400, the lower end of the injection part 320 can extend into the fifth cavity 410 along the second conical surface 411 until the lower end of the first conical surface 321 of the injection part 320 completely abuts against the lower end of the second conical surface 411 of the fifth cavity 410 on a certain horizontal plane. Through the cooperation of the first conical surface 321 and the second conical surface 411, the injection part 320 and the sprue bushing 400 achieve line sealing, effectively preventing the injection part 320 from shifting during injection, resulting in the molding material overflowing from the nozzle assembly 100.

[0041] The specific assembly process of the nozzle assembly 100 is as follows: First, put the nozzle 300 into the upper end of the nozzle housing 200. Due to the gravity of the nozzle 300, the spherical surface of the mounting portion 310 is tightly connected to the spherical surface of the first cavity 210. At this time, the lower end of the injection portion 320 extends out of the nozzle housing 200. Second, put the buffer 120 into the nozzle housing 200 and make the buffer 120 abut against the upper end face of the nozzle 300. Then, use a circlip pliers to clamp the circlip 110 in the mounting groove 211, so that the circlip 110, the buffer 120, and the nozzle 300 are installed in the nozzle housing 200 from top to bottom in sequence. Then, fix the nozzle housing 200 in the cold runner by screwing it tightly. Finally, if the lower end face of the injection portion 320 is a plane and the upper end face of the sprue bushing 400 is a plane, adjust the nozzle 300 so that the injection cavity is aligned with the fifth cavity 410, and make the lower end face of the injection portion 320 tightly abut against the top surface of the sprue bushing 400, so as to form a tight surface contact between the two and prevent the molding material from leaking from this place; if a part of the outer peripheral surface at the lower end of the injection portion 320 is a conical surface and a part of the inner peripheral surface at the upper end of the fifth cavity 410 is a conical surface, align the lower end of the injection portion 320 and insert it into the fifth cavity 410, so that a part of the first conical surface 321 of the injection portion 320 abuts against the second conical surface 411 of the fifth cavity 410, so that the injection portion 320 and the sprue bushing 400 achieve line sealing and avoid the molding material from leaking from this place. So far, the nozzle assembly 100 is assembled. Among them, the cold runner, the first cavity 210, the third cavity 330, the fourth cavity 340, and the fifth cavity 410 are connected to form a runner for the molding material. During injection, the molding material passes through the cold runner, the first cavity 210, the third cavity 330, the fourth cavity 340, and the fifth cavity 410 in sequence, and then enters the mold to complete the injection.

[0042] The beneficial effects of the present application are as follows: In the nozzle assembly of the present application, the spherical surface of the mounting portion can be tightly fitted with the spherical surface of the first cavity, and the matching spherical surfaces enable the nozzle to rotate at a certain angle in the nozzle housing, so that the nozzle always remains vertical and has a tight surface contact with the sprue bushing, effectively avoiding the overflow of the molding material from the connection between the nozzle and the sprue bushing, thereby avoiding material waste and increased production costs.

[0043] At the same time, a circlip is provided above the nozzle, and there is a certain distance between the upper end of the nozzle and the circlip, so that the nozzle can have a space for up and down movement in the nozzle housing. Furthermore, the nozzle can adaptively adjust the axial height within a certain range according to the change in the depth of the nozzle housing screwed into the cold runner, so that the nozzle and the sprue bushing always maintain a tight connection; the setting of the circlip can limit the maximum upward movement distance of the nozzle, avoiding that when injection is abnormal, a large injection reaction force causes the nozzle to continuously move upward and cannot press the sprue bushing tightly, resulting in more material waste.

[0044] In addition, through the cooperation of the first conical surface and the second conical surface, the injection part of the nozzle can extend into the sprue bushing, and the injection part and the sprue bushing are in complete contact to achieve line sealing, effectively preventing the molding material from overflowing from the connection between the nozzle and the sprue bushing due to the offset of the injection part during the injection process.

[0045] The above are only the embodiments of the present application, and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, shall be similarly included in the patent protection scope of the present application.

Claims

1. A nozzle assembly, used for an injection machine to deliver molding material to a mold, characterized in that: The nozzle assembly comprises: A nozzle shell, the nozzle shell is installed on the injection machine, and a mounting cavity is opened in the nozzle shell, the mounting cavity includes a first cavity and a second cavity which are connected, and at least a part of the inner circumference of the first cavity is a spherical surface; The nozzle comprises a mounting portion and an injection portion, wherein the outer peripheral surface of the mounting portion matches the spherical surface of the first cavity and is used to mount the nozzle in the nozzle shell; an injection cavity is also provided in the nozzle, and the injection cavity passes through the mounting portion and the injection portion and is used to convey the molding material.

2. The nozzle assembly according to claim 1, characterized in that: The outer wall of the nozzle shell is provided with an external thread, the inner wall of the cold runner of the injection machine is provided with an internal thread, and the nozzle shell is connected to the cold runner through threads.

3. The nozzle assembly according to claim 1, characterized in that: The first cavity and the second cavity are both cylindrical cavities, the diameter of the first cavity is greater than the diameter of the second cavity, and the inner circumferential surface of the bottom of the first cavity is a spherical surface.

4. The nozzle assembly according to claim 1, characterized in that: The injection cavity comprises a third cavity and a fourth cavity which are connected, the third cavity is an inverted truncated cone cavity, the fourth cavity is a cylindrical cavity, and the diameter of the lower end of the third cavity is equal to the diameter of the fourth cavity.

5. The nozzle assembly according to claim 1, characterized in that: The nozzle assembly also includes a sprue sleeve, which is provided with a fifth cavity, and the end of the injection portion extending out of the nozzle shell is cooperatively connected with the sprue sleeve.

6. The nozzle assembly according to claim 5, characterized in that: The lower end surface of the injection portion is a plane, the upper end surface of the sprue bushing is a plane, the lower end surface of the injection portion abuts against the upper end surface of the sprue bushing, and the injection cavity is aligned with the fifth cavity.

7. The nozzle assembly according to claim 5, characterized in that: Part of the outer circumference of the lower end of the injection part is a first conical surface, and part of the inner circumference of the upper end of the fifth cavity is a second conical surface. The lower end of the injection part extends into the fifth cavity and the first conical surface abuts against the second conical surface.

8. The nozzle assembly according to claim 1, characterized in that: The nozzle assembly also includes a retaining spring. A mounting groove is provided on the outer peripheral surface of the first cavity. The mounting groove is located above the spherical surface. The retaining spring is clamped in the mounting groove.

9. The nozzle assembly according to claim 8, characterized in that: The nozzle assembly further includes a buffer component, which is disposed in the first cavity and between the clamping spring and the nozzle.

10. The nozzle assembly according to claim 9, characterized in that: The buffer is made of polytetrafluoroethylene or aramid.

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