Valve needle and hot runner system
By setting an insert with low thermal conductivity on the valve needle end face, the problem of material sticking to the valve needle due to excessive temperature is solved, achieving both aesthetic appeal of the gate and flexibility in process adjustment.
Patent Information
- Application Number
- CN202520052075.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-09
- Publication Date
- 2025-12-30
- Estimated Expiration
- 2035-01-09
AI Technical Summary
Material sticking to the tip of the valve needle due to excessive temperature affects the appearance of the gate and narrows the process adjustment window.
An insert with low thermal conductivity is provided on the valve needle end face. It is made of PLAVIS material and fixed to the body by threaded connection. The insert only covers the middle part of the sealant end face to ensure that the thermal conductivity is reduced but the strength is not affected.
It effectively reduces the risk of material sticking to the valve needle, maintains the aesthetics of the gate, and does not affect the wear resistance and rigidity of the valve needle.
Smart Images
Figure CN223735361U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of hot runner systems, in particular to a valve needle and a hot runner system provided with the valve needle. BACKGROUND
[0002] At present, the temperature of the needle head of the needle valve type hot runner is too high due to excessive shearing, which often causes the needle to stick to the material at the product gate, resulting in an unattractive gate. Controlling the temperature of the mold and the hot nozzle will cause other problems in the product, making the process adjustment window narrow. SUMMARY
[0003] The purpose of the present application is to provide a valve needle with a low thermal conductivity insert on the end face, which solves the problem of sticking of the valve needle caused by too high temperature of the end of the valve needle in the prior art.
[0004] In order to achieve one of the above-mentioned purposes, an embodiment of the present application provides a valve needle comprising a body and an insert, the body is provided with a receiving groove on the end face of the glue sealing end, the insert is arranged in the receiving groove, and the end face of the body for sealing glue and the end face of the insert are smoothly connected to form the glue sealing end face of the valve needle, and the thermal conductivity of the insert is lower than that of the body.
[0005] As a further improvement of the embodiment of the present application, the insert is made of PLAVIS material.
[0006] As a further improvement of the embodiment of the present application, the glue sealing end face is a curved surface, the projection of the valve needle in the length direction, and the ratio of the diameter of the insert to the diameter of the body near the end of the insert is (0.65-0.85):1.
[0007] As a further improvement of the embodiment of the present application, the inner wall of the receiving groove is provided with internal threads, the insert is provided with external threads, and the insert is connected to the body through threaded connection.
[0008] As a further improvement of the embodiment of the present application, the receiving groove comprises a first receiving groove and a second receiving groove, the inner diameter of the first receiving groove is smaller than that of the second receiving groove, and the inner wall of the first receiving groove is provided with the aforementioned internal threads.
[0009] The insert comprises a connecting part and a filling part with outer diameters matched with the inner diameters of the first receiving groove and the second receiving groove, respectively, and the connecting part is provided with the aforementioned external threads.
[0010] As a further improvement of the embodiment of the present application, the body comprises a sealing head provided with inserts on the end face, a pressure reducing part with a diameter larger than that of the sealing head, and a transition section connecting the sealing head and the pressure reducing part, the diameter of the transition section at the end connected with the pressure reducing part is the same as that of the pressure reducing part, and gradually decreases to the same diameter as that of the sealing head in the direction extending to the sealing head.
[0011] As a further improvement of the embodiment of the present application, the ratio of the diameter of the sealing head to that of the pressure reducing part is (0.65-0.80):1.
[0012] As a further improvement of the embodiment of the present application, the valve needle is provided with a material returning groove extending along the length direction of the valve needle at the end close to the end provided with inserts.
[0013] As a further improvement of the embodiment of the present application, the material returning groove is provided with three, which are uniformly arranged along the circumference of the valve needle.
[0014] The embodiment of the present application also provides a hot runner system comprising a distribution plate, a hot nozzle connected with the distribution plate, and a valve needle arranged in the hot nozzle, wherein the valve needle is the valve needle as described above.
[0015] The one or more technical solutions provided by the present application have at least the following technical effects or advantages:
[0016] In the valve needle provided by the present application, the body end is slotted, and the inserts are arranged in the slot, the thermal conductivity of the inserts is lower than that of the body, that is, the body is made of the material of the conventional valve needle, and the inserts are made of the material with relatively low thermal conductivity, thereby reducing the possibility of material sticking to the valve needle and keeping the gate beautiful. BRIEF DESCRIPTION OF DRAWINGS
[0017] Figure 1 is a side view of the valve needle in the embodiment of the present application.
[0018] Figure 2 is Figure 1 is a sectional view along line A-A in FIG. 1.
[0019] Figure 3 is Figure 2 is an enlarged view of B in FIG. 1.
[0020] Figure 4 is Figure 1 is an end face view of the valve needle in FIG. 1.
[0021] Figure 5 is a machining reference drawing of the valve needle in the embodiment of the present application.
[0022] Figure 6 is another machining reference drawing of the valve needle in the embodiment of the present application.
[0023] 1, body; 11, glue head; 111, containing groove; 1111, first containing groove; 1112, second containing groove; 12, transition section; 13, pressure reduction part; 14, material return groove; 2, insert; 21, connecting part; 22, filling part; 3, operation part. DETAILED DESCRIPTION
[0024] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.
[0025] The terms such as "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like used herein to indicate spatial relative positions are for the purpose of facilitating description to describe the relationship of one unit or feature relative to another unit or feature as shown in the drawings. The spatial relative position terms can be intended to include different orientations of the device in use or in operation in addition to the orientation shown in the drawings.
[0026] For example, if the device in the drawing is turned over, the unit described as being "below" or "under" the other unit or feature will be "above" the other unit or feature. Therefore, the exemplary term "below" can encompass both upward and downward orientations. The device can be oriented in other ways (rotated 90 degrees or other orientations), and the spatially-related descriptions used herein are interpreted accordingly.
[0027] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0028] And it should be understood that although the terms first, second, etc. can be used herein to describe various elements or structures, these described objects should not be limited by these terms. These terms are only used to distinguish these described objects from each other. For example, the first containing groove can be called the second containing groove, and similarly the second containing groove can also be called the first containing groove, which does not deviate from the scope of protection of the present application.
[0029] The embodiments of the present application provide a valve needle, such asFigures 1 to 6 As shown, the valve needle comprises a body 1 and an insert 2, the body 1 is provided with a receiving groove 111 at the end surface of the glue sealing end, the insert 2 is arranged in the receiving groove 111, and the end surface of the glue sealing end of the body 1 and the end surface of the insert 2 are smoothly connected to form the glue sealing end surface of the valve needle, and the thermal conductivity of the insert 2 is lower than that of the body 1.
[0030] When the valve needle is glued, the glue sealing end surface of the valve needle is in contact with the plastic. The present application opens a receiving groove 111 at the end surface of the body 1, and the receiving groove 111 is arranged in the middle of the end surface of the glue sealing end of the body 1, and is coaxially arranged with the body 1. A low-thermal-conductivity insert 2 is arranged in the receiving groove 111. The insert 2 does not cover the entire glue sealing end surface, but only the middle part of the glue sealing end surface. However, under the action of the surface tension of the glue, the glue tends to concentrate in the middle part when the mold is demolded away from the glue sealing end surface of the valve needle after gluing. The middle part of the glue sealing end surface of the valve needle of the present application is the insert 2 with low thermal conductivity, so that the valve needle end surface is not easy to stick to the glue, and the beauty of the gate is not affected. Figure 3 、 4 The insert 2 does not cover the entire glue sealing end surface, but only the middle part of the glue sealing end surface. However, under the action of the surface tension of the glue, the glue tends to concentrate in the middle part when the mold is demolded away from the glue sealing end surface of the valve needle after gluing. The middle part of the glue sealing end surface of the valve needle of the present application is the insert 2 with low thermal conductivity, so that the valve needle end surface is not easy to stick to the glue, and the beauty of the gate is not affected.
[0031] In addition, when the valve needle is glued close to the gate, the valve needle is elongated, and there is a possibility of deviating from the gate. Since the insert 2 does not occupy the entire end surface, the outer periphery of the glue sealing end surface and the side adjacent to the glue sealing end surface of the valve needle still belong to part of the body 1, and the material used is the high-hardness steel material used by conventional valve needles. When the valve needle collides with the gate, the body 1 is rigid and wear-resistant, so that the valve needle of the present application can improve the problem of sticking to the glue without reducing the original performance of the valve needle.
[0032] Preferably, the insert 2 is made of PLAVIS material. PLAVIS has better thermal expansion coefficient than conventional metal materials used as valve needles. The valve needle works at high temperature, and PLAVIS uses its high thermal expansion coefficient to tightly press against the inner wall of the receiving groove 111 of the body 1 to avoid the formation of a gap between the body 1 and the insert 2 to store glue.
[0033] In some embodiments, the glue sealing end surface is a curved surface, and the ratio of the diameter of the insert 2 to the diameter of the end of the body 1 close to the insert 2 in the projection of the valve needle in the length direction is (0.65-0.85):1. The curved glue sealing end surface can better reduce the resistance of the glue, and controlling the ratio of the diameter of the insert 2 to the diameter of the end of the body 1 close to the insert 2 can ensure that the wall thickness of the receiving groove 111 can maintain the strength required by the valve needle during gluing, and on this basis, the insert 2 can have a larger area to prevent sticking to the glue.
[0034] Regarding the connection relationship between the body 1 and the insert 2, the present application is provided with an internal thread on the inner wall of the receiving groove 111, and the insert 2 is provided with an external thread. The insert 2 is connected with the body 1 through threaded connection.
[0035] Specifically, as shown in Figure 5 , the accommodating groove 111 includes a first accommodating groove 1111 and a second accommodating groove 1112, the inner diameter of the first accommodating groove 1111 is smaller than that of the second accommodating groove 1112, and the inner wall of the first accommodating groove 1111 is provided with the inner thread; the insert 2 includes a connecting part 21 and a filling part 22, the outer diameter of the connecting part 21 matches the inner diameter of the first accommodating groove 1111 and the second accommodating groove 1112, and the connecting part 21 is provided with the outer thread.
[0036] For the connection between the body 1 and the insert 2, please refer to Figure 5 , a valve needle body 1 made of a conventional material is adopted, the first accommodating groove 1111 and the second accommodating groove 1112 are formed in the end face of the valve needle body 1, and the inner thread is formed on the inner wall of the first accommodating groove 1111. The processing piece as shown in Figure 5 is adopted, wherein the processing piece includes the connecting part 21 and the filling part 22 of the insert 2, and the operation part 3 connected to the end of the filling part 22 away from the connecting part 21, the outer thread is formed on the outer part of the connecting part 21, and the operation part 3 can be polygonal to assist workers in tightening the processing piece and the body 1. Please refer to Figure 6 , the processing piece is partially removed, and the valve needle with the insert 2 can be processed into a desired structure (such as the structure shown in the shadow part of Figure 6 ) on the outer surface as a conventional valve needle.
[0037] In some embodiments of the present application, the body 1 includes the sealing head 11 provided with the insert 2, the pressure reducing part 13 with a diameter larger than that of the sealing head 11, and the transition section 12 connecting the sealing head 11 and the pressure reducing part 13, the diameter of the end of the transition section 12 connected to the pressure reducing part 13 is the same as that of the pressure reducing part 13, and gradually decreases to the same diameter as that of the sealing head 11 in the direction extending to the sealing head 11.
[0038] The diameter of the valve needle is reduced by the transition section 12 near the end of the sealing head 11, which can reduce the resistance and the shear heat when the valve needle operates, and further reduce the risk of the valve needle sticking to the glue. The processing of the sealing head 11, the transition section 12 and the pressure reducing part 13 can be referred to Figure 6 , which is processed together with the operation part 3 of the processing piece after the processing piece is installed.
[0039] Preferably, the ratio of the diameter of the sealing head 11 to the diameter of the pressure reducing part 13 is (0.65-0.80):1.
[0040] In some embodiments, the valve needle is provided with the material return groove 14 extending along the length direction of the valve needle near the end provided with the insert 2. When the valve needle is sealed, the excess glue will flow back, and the material return groove 14 provides space for the backflowing glue.
[0041] Preferably, three material return grooves 14 are provided, and the three material return grooves 14 are uniformly arranged along the circumference of the valve needle. Figure 3 In particular, the material return groove 14 extends from the transition section 12 to the middle of the body 1 in the length direction through the pressure reduction section 13.
[0042] The embodiment of the present application also provides a hot runner system, which comprises a distribution plate, a hot nozzle connected with the distribution plate, and a valve needle arranged in the hot nozzle, wherein the valve needle is the valve needle described above.
[0043] It should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the specification is described in this way only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand.
[0044] The series of detailed descriptions listed above are only specific descriptions of the feasible embodiments of the present application, and are not used to limit the protection scope of the present application, and equivalent embodiments or changes made without departing from the spirit of the present application should be included in the protection scope of the present application.
Claims
1. A valve needle, characterized in that The valve needle comprises a body and an insert, the body is used for sealing glue and has an accommodating groove on the end face, the insert is arranged in the accommodating groove, and the end face of the body and the end face of the insert are smoothly connected to form a sealing glue end face of the valve needle, and the thermal conductivity of the insert is lower than that of the body.
2. The valve needle of claim 1, wherein The insert is made of PLAVIS material.
3. The valve needle of claim 1, wherein The sealing glue end face is a curved surface, the projection of the valve needle in the length direction is a circle, and the ratio of the diameter of the insert to the diameter of the body near the end of the insert is (0.65-0.85):
1.
4. The valve needle of claim 1, wherein The inner wall of the accommodating groove is provided with an internal thread, the insert is provided with an external thread, and the insert is connected with the body through thread connection.
5. The valve needle of claim 4, wherein The accommodating groove comprises a first accommodating groove and a second accommodating groove, the inner diameter of the first accommodating groove is smaller than that of the second accommodating groove, and the inner wall of the first accommodating groove is provided with the internal thread. The insert comprises a connecting part and a filling part, the connecting part is matched with the inner diameter of the first accommodating groove and the second accommodating groove, and the filling part is matched with the inner diameter of the first accommodating groove and the second accommodating groove.
6. The valve needle of claim 1, wherein The body comprises a sealing head provided with the insert on the end face, a pressure reducing part with a diameter larger than that of the sealing head, and a transition section connecting the sealing head and the pressure reducing part, the diameter of the transition section at the end connected with the pressure reducing part is the same as that of the pressure reducing part, and the diameter gradually decreases to the same as that of the sealing head in the direction extending to the sealing head.
7. The valve needle of claim 6, wherein The ratio of the diameter of the sealing head to that of the pressure reducing part is (0.65-0.80):
1.
8. The valve needle of claim 1, wherein The valve needle is provided with a material returning groove extending along the length direction of the valve needle near the end provided with the insert.
9. The valve needle of claim 8, wherein, The material returning groove is provided with three, and the three material returning grooves are uniformly arranged along the circumference of the valve needle.
10. A hot runner system, comprising a manifold, a hot nozzle connected to the manifold, and a valve needle disposed within the hot nozzle, characterized in that, The valve needle is the valve needle according to any one of claims 1-9.