Hot nozzle with guiding function
By setting guide grooves, guide holes and flow holes on the guide block of the hot nozzle, and using the drive device to move the valve needle back and forth in the runner, the damage to the core and product quality problems caused by the bending and tilting of the valve needle in the existing hot nozzle are solved, and a smoother casting process and higher product quality are achieved.
Patent Information
- Application Number
- CN202421816775.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-30
- Publication Date
- 2025-05-09
- Estimated Expiration
- 2034-07-30
AI Technical Summary
During the pouring process of the existing hot nozzle, the valve needle is bent and tilted during the sealing process, which causes the valve needle to shift and impact the core, causing the core pits and dead corners, affecting the product quality.
A heat nozzle with a guide function is designed. By providing a guide groove and a guide hole on the guide block, and an oblique wall and a plurality of flow holes are provided on the side of the guide groove. The guide block is in communication with the nozzle core flow channel, and the valve needle is moved reciprocatingly in the flow channel through the driving device. The guide block guides the valve needle to avoid direct collision with the nozzle core.
It effectively avoids direct collision between the valve needle and the core, protects the core structure, reduces the plastic retention time, avoids the product's blackening and yellowing, and improves the performance and product quality of the hot nozzle.
Smart Images
Figure CN222844652U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of plastic mold casting, in particular to a hot nozzle with a guiding function. Background Art
[0002] At present, as the precision industry's demand for the precision of injection molding products becomes more and more stringent, the precision requirements for the hot runner of the injection mold have also increased. Some existing hot nozzles control the opening and closing of the gate through a valve needle. After the valve needle is inserted into the runner of the hot nozzle, it is only guided by the hot nozzle core installed inside the runner. This method of guidance has the following shortcomings:
[0003] With a nozzle-guided structure, the valve needle will bend and tilt to a certain extent during the sealing process due to the resistance of the softened plastic in the hot nozzle and the injection pressure resistance, causing the valve needle to deviate and collide with the nozzle. Since the nozzle is usually made of stainless steel on the inside and beryllium copper on the outside, beryllium copper is softer than the valve needle. After the collision, pits and dead corners are easily formed, causing the plastic to be retained and decomposed here for a long time during production, which in turn causes the product to turn yellow or black, seriously affecting the product quality. Especially in some hot runner systems with longer hot nozzles, the risk of valve needle bending and tilting is greater, and it is more likely to come into contact and collide with the nozzle. Utility Model Content
[0004] In view of this, in order to solve the problems existing in the above-mentioned prior art, the utility model provides a hot nozzle with a guiding function.
[0005] A hot nozzle with a guiding function comprises a hot nozzle body, a flow channel is arranged inside the hot nozzle body, a guide block, a valve needle and a nozzle core are arranged in the flow channel, a guide groove is opened at one end of the guide block, a guide hole is arranged at the bottom of the guide groove, the guide hole passes through the guide block, the valve needle is inserted in the guide hole, the side of the guide groove is an inclined wall, a plurality of guide holes are arranged at intervals on the inclined wall, the guide holes pass through the guide block, the nozzle core is provided with a nozzle core flow channel, a discharge port is arranged at one end of the hot nozzle body, and the nozzle core flow channel is communicated with the discharge port.
[0006] In the above technical solution, the valve needle is connected to a driving device, which drives the valve needle to reciprocate inside the flow channel. The guide block is installed in the flow channel to guide the valve needle inserted into the hot nozzle body. A guide groove is provided on the guide block. The side of the guide groove is an inclined wall, which is inclined downward toward the center of the guide groove. A guide hole is opened at the bottom center of the guide groove. The guide hole cooperates with the valve needle and runs through the entire guide block. After the valve needle enters the flow channel of the hot nozzle body, it is inserted into the guide hole. Since the side of the guide groove is an inclined wall, the process of the valve needle entering the guide hole can be smoother. Among them, when there is plastic inside the flow channel and the resistance of the valve needle after insertion is very large, the valve needle may produce a certain inclination or bending. The inclined wall can play a certain guiding role on the valve needle, so that the valve needle can slide smoothly into the guide hole, thereby ensuring the guiding effect on the valve needle. At the same time, in the process of the valve needle moving up and down, the guide The guidance and constraint of the valve needle by the guide block can effectively prevent the valve needle from directly colliding with the end face of the nozzle core, prevent pits and dead corners from appearing after the nozzle core hits, protect the nozzle core structure, and avoid affecting the performance of the hot nozzle; a plurality of guide holes are arranged at intervals on the inclined wall in the guide groove, and after the valve needle is inserted into the guide hole, the molten plastic can continue to move through the guide hole without affecting the normal passage, and due to the inclined inclined wall of the guide groove, the plastic can smoothly pass through the guide block, and avoid the plastic from staying in the hot nozzle for too long, alleviating the blackening and yellowing of the product; the nozzle core is provided with a nozzle core flow channel, and the molten plastic enters the nozzle core flow channel after passing through the guide block, and finally flows out from the discharge port at the end of the hot nozzle body and enters the mold cavity. The valve needle can be inserted into the nozzle core flow channel under the drive of the driving device, and by moving up and down, the connection between the nozzle core flow channel and the discharge port is blocked or given way, and whether the plastic can pass through the discharge port is controlled, so as to realize the switch control of the discharge port.
[0007] As an optional technical solution of the present application, the guide hole is U-shaped, and a plurality of the guide holes are distributed around the guide hole at the same angle and are connected to the peripheral side of the guide hole.
[0008] In the above technical solution, the cross-section of the guide hole is U-shaped, which is arranged around the circumference of the guide hole and is connected to the guide hole. The U-shaped shape can ensure the normal passage of plastic while ensuring that the valve needle will not be inserted into the guide hole, causing the valve needle to get stuck.
[0009] As an optional technical solution of the present application, the axis of the discharge port coincides with the axis of the valve needle.
[0010] In the above technical solution, the axis of the discharge port coincides with the axis of the valve needle, that is, the two are coaxially arranged to prevent the valve needle from having a gap when blocking the discharge port, thereby avoiding leakage.
[0011] As an optional technical solution of the present application, an adjustment groove is formed at one end of the guide block away from the guide groove, and the guide hole passes through the bottom of the adjustment groove.
[0012] In the above technical solution, by providing the adjustment groove, the distance that the molten plastic passes through the inside of the guide block can be shortened, the contact time can be shortened, the heat exchange and heat loss can be reduced, and the injection molding effect can be guaranteed.
[0013] As an optional technical solution of the present application, the side surface of the adjustment groove is an inclined wall, and the adjustment groove is connected to one end of the nozzle core flow channel.
[0014] In the above technical solution, the side of the adjustment groove is also an inclined wall, and its inclination direction is symmetrical with the inclination direction of the inclined wall of the guide groove. By setting the inclined wall, the plastic can be dispersed after passing through the guide hole, so that the plastic can flow more evenly. The adjustment groove is connected to the nozzle core flow channel, and the plastic enters the nozzle core flow channel after being dispersed through the adjustment groove.
[0015] As an optional technical solution of the present application, a mounting groove is provided at one end of the nozzle core close to the guide block, and the guide block is provided with a mounting protrusion matching with the mounting groove.
[0016] In the above technical solution, the mounting protrusion is inserted into the mounting groove, and the guide block is connected to the nozzle core through the mounting protrusion and the mounting groove.
[0017] As an optional technical solution of the present application, a gate is further provided in the flow channel, and the gate is sleeved on the outer side of the nozzle.
[0018] In the above technical solution, the gate sleeve is arranged on the outer side of the nozzle core to play the role of temperature insulation and pressure bearing to ensure the normal progress of the injection molding work.
[0019] As an optional technical solution of the present application, a sealing sleeve is provided on the inner side of the discharge port, one end of the sealing sleeve is connected to the discharge port, and the other end is located on the inner side of the nozzle core flow channel and is clamped with the nozzle core flow channel.
[0020] In the above technical solution, the nozzle core flow channel and the discharge hole are connected through a sealing sleeve. The plastic in the nozzle core flow channel flows into the mold cavity from the discharge port after passing through the sealing sleeve. The sealing sleeve is used to ensure that all the plastic flows out from the discharge port and prevent the plastic from flowing into the gap between the hot nozzle body and the nozzle core.
[0021] The beneficial effects of this application are:
[0022] In the present application, a guide block is provided in the flow channel of the hot nozzle to guide the valve needle before the valve needle enters the nozzle core flow channel. A guide groove is provided on the guide block, and the side of the guide groove is an inclined wall, which can play a certain guiding role for the valve needle, so that the valve needle can smoothly slide into the guide hole, thereby ensuring the guiding effect on the valve needle. At the same time, the guidance and constraint of the valve needle by the guide block can effectively avoid the valve needle from directly colliding with the end face of the nozzle core, and prevent the nozzle core from having pits and dead corners after the collision, resulting in plastic retention, thereby avoiding affecting the performance of the hot nozzle; a plurality of guide holes are arranged at intervals on the inclined wall in the guide groove, and the plastic can pass through the guide block smoothly, thereby avoiding the plastic from staying inside the hot nozzle for too long and alleviating the blackening and yellowing of the product. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.
[0024] Figure 1 It is a schematic structural diagram of a hot nozzle with a guiding function according to an embodiment.
[0025] Figure 2 for Figure 1 Enlarged view of position A in the middle.
[0026] Figure 3 It is a cross-sectional schematic diagram of the guide block.
[0027] Figure 4 It is a top view of the guide block.
[0028] Description of reference numerals in the figures:
[0029] 1-hot nozzle body; 11-flow channel; 12-discharge port; 2-guide block; 21-guide groove; 211-inclined wall; 212-flow guide hole; 22-guide hole; 23-adjusting groove; 24-mounting protrusion; 3-valve needle; 4-nozzle core; 41-nozzle core flow channel; 42-mounting groove; 5-gate; 6-sealing sleeve. DETAILED DESCRIPTION
[0030] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.
[0031] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.
[0032] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.
[0033] Please refer to Figures 1 to 4 In a preferred embodiment of the present application, a hot nozzle is provided, which includes a hot nozzle body 1, a flow channel 11 is provided inside the hot nozzle body 1, a guide block 2, a valve needle 3 and a nozzle core 4 are provided in the flow channel 11, a guide groove 21 is opened at one end of the guide block 2, a guide hole 22 is provided at the bottom of the guide groove 21, the guide hole 22 penetrates the guide block 2, the valve needle 3 is inserted in the guide hole 22, the side of the guide groove 21 is an inclined inclined wall 211, a plurality of guide holes 212 are arranged on the inclined wall 211 at intervals, the guide holes 212 penetrate the guide block 2, the nozzle core 4 is provided with a nozzle core flow channel 4111, and a discharge port 12 is provided at one end of the hot nozzle body 1, and the nozzle core flow channel 4111 is connected with the discharge port 12.
[0034] In this embodiment, the valve needle 3 is connected to a driving device. Under the drive of the driving device, the valve needle 3 is inserted into the flow channel 11 from the top of the hot nozzle body 1 and can move up and down reciprocatingly. The guide block 2 is installed in the flow channel 11 to guide the inserted valve needle 3. The guide block 2 is provided with a guide groove 21. The side of the guide groove 21 is an inclined wall 211, which is inclined downward toward the center of the guide groove 21. When viewed from the side, a structure similar to an inverted cone is formed (such as Figure 1As shown in the figure, a guide hole 22 is formed at the bottom center of the guide groove 21. The guide hole 22 cooperates with the valve needle 3 and runs through the entire guide block 2. After the valve needle 3 enters the flow channel 11 of the hot nozzle body 1, it is inserted into the guide hole 22. Since the side of the guide groove 21 is an inclined wall 211, the process of the valve needle 3 entering the guide hole 22 can be smoother. When there is plastic inside the flow channel 11 and the resistance of the valve needle 3 after insertion is very large, the valve needle 3 may be tilted or bent to a certain extent. The inclined wall 211 can guide the valve needle 3 to a certain extent, so that the valve needle 3 can slide smoothly into the guide hole 22 to ensure the guiding effect on the valve needle 3. At the same time, in the process of the valve needle 3 moving up and down, the valve needle 3 is guided and constrained by the guide block 2, which can effectively avoid the valve needle 3 from directly colliding with the end face of the nozzle core 4, prevent the nozzle core 4 from having pits and dead angles after the collision, and protect the structure of the nozzle core 4. Avoid affecting the performance of the hot nozzle; a plurality of guide holes 212 are arranged at intervals on the inclined wall 211 in the guide groove 21. After the valve needle 3 is inserted into the guide hole 22, the molten plastic can continue to move through the guide hole 212 without affecting the normal passage. Moreover, due to the inclined inclined wall 211 of the guide groove 21, the plastic can smoothly pass through the guide block 2, avoiding the plastic from staying inside the hot nozzle for too long, and alleviating the blackening and yellowing of the product; the nozzle core 4 is provided with a nozzle core flow channel 4111. The molten plastic enters the nozzle core flow channel 4111 after passing through the guide block 2, and finally flows out from the discharge port 12 at the end of the hot nozzle body 1 and enters the mold cavity. The valve needle 3 can be inserted into the nozzle core flow channel 4111 under the drive of the driving device, and by moving up and down, the connection between the nozzle core flow channel 4111 and the discharge port 12 is blocked or given way, thereby controlling whether the plastic can pass through the discharge port 12 and realizing the switch control of the discharge port 12.
[0035] Specifically, if Figure 1 As shown, the width of the flow channel 11 is the same as the top width of the guide groove 21, thereby ensuring that all the plastic passes through the guide block 2 from the guide groove 21 to avoid plastic retention.
[0036] Please refer to Figure 3 and Figure 4 In this embodiment, the guide hole 212 is U-shaped when viewed from the top of the guide block 2. There are four guide holes 212, which are distributed around the guide hole 22 at the same angle (i.e., 90°) and are connected to the peripheral side of the guide hole 22. The closed end of the U-shaped guide hole 212 is connected to the guide hole 22, which ensures that the valve needle 3 will not be inserted into the guide hole 212 while ensuring the normal passage of the plastic, causing the valve needle 3 to be stuck. Figure 3 The guide hole 212 on the inclined wall 211 is omitted. Figure 4 .
[0037] In some embodiments, preferably, Figure 4As shown, the ends of both sides of the U-shaped opening of the guide hole 212 are widened to increase the passing speed of the plastic, and the specific setting is based on actual needs.
[0038] Please refer to Figure 1 and Figure 2 In this embodiment, the axis of the discharge port 12 coincides with the axis of the valve needle 3, that is, the two are coaxially arranged to prevent the valve needle 3 from being incompletely sealed when blocking the discharge port 12, resulting in a gap and avoiding leakage.
[0039] Please refer to Figure 1 and Figure 3 In this embodiment, an adjustment groove 23 is formed at one end of the guide block 2 away from the guide groove 21, and the guide hole 22 penetrates to the bottom of the adjustment groove 23. By setting the adjustment groove 23, the distance that the molten plastic passes through the inside of the guide block 2 can be shortened, the contact time can be shortened, the heat exchange and heat loss can be reduced, and the injection molding effect can be ensured.
[0040] Please refer to Figure 1 and Figure 3 In this embodiment, similar to the guide groove 21, the side of the adjustment groove 23 is also an inclined wall, and its inclination direction is symmetrical with the inclination direction of the inclined wall 211 of the guide groove 21 about the horizontal plane. By setting the inclined wall, the plastic can be quickly dispersed after passing through the guide hole 212, so that the plastic can flow more evenly. The bottom of the adjustment groove 23 is connected to the top of the nozzle core flow channel 4111, and the plastic directly enters the nozzle core flow channel 4111 after being dispersed through the adjustment groove 23.
[0041] Please refer to Figure 1 and Figure 3 In this embodiment, a mounting groove 42 is provided at one end of the nozzle core 4 close to the guide block 2, and the guide block 2 is provided with a mounting protrusion 24 matching the mounting groove 42. The mounting protrusion 24 is inserted into the mounting groove 42. The guide block 2 is connected to the nozzle core 4 through the mounting protrusion 24 and the mounting groove 42. This structure is easier to assemble.
[0042] Please refer to Figure 1 In this embodiment, a gate 5 is further provided in the runner 11. The gate 5 is provided at the bottom of the runner 11. The gate 5 is sleeved on the outer side of the nozzle 4 to play the role of temperature insulation and pressure bearing to ensure the normal progress of the injection molding work.
[0043] Please refer to Figure 1 and Figure 2In this embodiment, a sealing sleeve 6 is provided on the inner side of the discharge port 12, and the nozzle core flow channel 4111 and the discharge hole are communicated through the sealing sleeve 6. One end of the sealing sleeve 6 is connected to the discharge port 12, and the other end is clamped on the inner side of the bottom of the nozzle core flow channel 4111. The plastic in the nozzle core flow channel 4111 flows into the mold cavity from the discharge port 12 after passing through the sealing sleeve 6. The sealing sleeve 6 is used to ensure that all the plastic flows out from the discharge port 12 to prevent the plastic from flowing into the gap between the hot nozzle body 1 and the nozzle core 4.
[0044] In the description of the present invention, it should be understood that terms such as "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
[0045] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.
[0046] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0047] Although the utility model is described in conjunction with the above specific embodiments, it is obvious that those skilled in the art can make many substitutions, modifications and changes based on the above content. Therefore, all such substitutions, improvements and changes are included in the spirit and scope of the appended claims.
Claims
1. A hot nozzle with a guiding function, comprising a hot nozzle body, wherein a flow channel is provided inside the hot nozzle body, characterized in that: A guide block, a valve needle and a nozzle core are provided in the flow channel, a guide groove is provided at one end of the guide block, a guide hole is provided at the bottom of the guide groove, the guide hole penetrates the guide block, the valve needle is inserted in the guide hole, the side of the guide groove is an inclined wall, a plurality of guide holes are provided at intervals on the inclined wall, the guide holes penetrate the guide block, the nozzle core is provided with a nozzle core flow channel, a discharge port is provided at one end of the hot nozzle body, and the nozzle core flow channel is communicated with the discharge port.
2. The hot nozzle with guiding function according to claim 1, characterized in that: The guide hole is in a U-shape, and a plurality of the guide holes are distributed around the guide hole at the same angle and are connected to the peripheral side of the guide hole.
3. The hot nozzle with guiding function according to claim 1, characterized in that: The axis of the discharge port coincides with the axis of the valve needle.
4. The hot nozzle with a guiding function according to claim 1, characterized in that: An adjusting groove is formed at one end of the guide block away from the guide groove, and the guide hole passes through the groove bottom of the adjusting groove.
5. The hot nozzle with a guiding function according to claim 4, characterized in that: The side surface of the adjusting groove is an inclined wall, and the adjusting groove is connected to one end of the nozzle core flow channel.
6. The hot nozzle with guiding function according to claim 1, characterized in that: An end of the nozzle core close to the guide block is provided with a mounting groove, and the guide block is provided with a mounting protrusion matched with the mounting groove.
7. The hot nozzle with a guiding function according to claim 1, characterized in that: A gate is also provided in the flow channel, and the gate is sleeved on the outer side of the nozzle.
8. The hot nozzle with a guiding function according to claim 1, characterized in that: A sealing sleeve is provided on the inner side of the material outlet, one end of the sealing sleeve is connected to the material outlet, and the other end is located on the inner side of the nozzle core flow channel and is clamped with the nozzle core flow channel.