Runner structure for preventing valve needle from deviating and plastic injection molding device

Abstract

The utility model discloses a runner structure for preventing a valve needle from shifting and a plastic injection molding device. The runner structure comprises a runner main body, a discharging nozzle, a telescopic driver and a valve needle, the discharging nozzle is mounted on the runner main body; a discharging channel is arranged in the discharging nozzle; the movement of the valve needle in the discharging channel is used for blocking or separating from the output end of the discharging channel through one end of the valve needle; the discharging channel is provided with needle guide blocks which are distributed in a surrounding manner on the periphery of the valve needle, and a material passing gap is formed between every two adjacent needle guide blocks; the needle guide block is provided with guide faces abutting against the outer side face of the valve needle, a guide ring opening is defined by the multiple guide faces, and the guide ring opening is coaxially aligned with the output end of the discharging channel. According to the scheme, the position of the valve needle is limited through the guide ring opening formed by the multiple needle guide blocks, it can be ensured that the valve needle always moves towards the output end of the discharging channel under the guide effect of the guide face, the moving stability of the valve needle is improved, and the problem that an existing valve needle is low in front-back moving stability and prone to abrasion due to heating is solved.

Description

Technical Field

[0001] The utility model relates to the field of injection molding devices, in particular to a flow channel structure for preventing valve needle deviation and a plastic injection molding device. Background Art

[0002] The existing flow channel will have a valve needle installed in the nozzle, and the valve needle can move to block or detach from the nozzle to control the flow of materials. The existing flow channel needs to be heated when feeding, so that the temperature of the flow channel rises, and the flow channel will expand due to the heat. Since the nozzle and the valve needle have different expansion degrees, the valve needle may be pressed against the inner wall of the nozzle. When the valve needle moves and retracts, it may excessively rub the inner wall of the nozzle. The movement stability of the valve needle is insufficient, resulting in the problem that the nozzle or valve needle is easily damaged after long-term use, affecting the service life of the nozzle or valve needle. Utility Model Content

[0003] The purpose of the present utility model is to propose a flow channel structure that prevents the valve needle from deviating. A guide needle block is arranged in the discharge channel inside the discharge nozzle, and the position of the valve needle is limited by a guide ring formed by multiple guide needle blocks, which can ensure that the valve needle always moves toward the output end of the discharge channel under the guidance of the guide surface, thereby improving the activity stability of the valve needle.

[0004] The utility model also provides a plastic injection molding device, which uses the above-mentioned flow channel structure.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] A flow channel structure for preventing a valve needle from deflecting comprises: a flow channel body, a discharge nozzle, a telescopic driver and a valve needle;

[0007] The discharge nozzle is mounted on the flow channel body; a discharge channel is provided inside the discharge nozzle; the telescopic actuator is mounted on the flow channel body, and the output end of the telescopic actuator is connected to the valve needle, for driving the valve needle to retract and move resettingly; the movement of the valve needle in the discharge channel is used to block or detach from the output end of the discharge channel through one end of the valve needle;

[0008] The discharge channel is provided with guide needle blocks distributed around the outer periphery of the valve needle, and a material passing gap is formed between adjacent guide needle blocks; the guide needle block is provided with a guide surface that abuts against the outer side surface of the valve needle, and a guide ring opening is formed around multiple guide surfaces, and the guide ring opening is coaxially aligned with the output end of the discharge channel.

[0009] Optimally, the guide needle block is provided with a lower slope at one end away from the output end of the discharge channel, and an upper slope at the output end close to the discharge channel;

[0010] The lower slope transitions obliquely from the inner wall of the discharge channel to one end of the guide surface, and the upper slope transitions obliquely from the inner wall of the discharge channel to the other end of the guide surface.

[0011] Optimally, the discharge channel includes, from the input end to the output end, a feed section and a discharge section;

[0012] The feed section is coaxially aligned with the discharge section, and the inner diameter of the feed section is larger than the inner diameter of the discharge section; the discharge section and the feed section are transitioned by a guide curved surface; the lower inclined surface is butted against the guide curved surface at the end away from the guide surface.

[0013] Optimally, it further comprises: an annular partition;

[0014] The annular partition is connected to the input end of the discharge nozzle;

[0015] The annular partition includes: an outer baffle and a bottom plate;

[0016] The discharge nozzle is mounted on the bottom plate at the input end; the outer baffle is vertically mounted on the bottom plate and surrounds the outer periphery of the discharge nozzle; a U-shaped partition is formed between the outer side wall of the discharge nozzle, the outer baffle and the bottom plate;

[0017] The flow channel body is provided with a nozzle mounting groove, and the outer baffle is fixed to the nozzle mounting groove so that the discharge nozzle is limited to the flow channel body.

[0018] Optimally, an inner wall of the nozzle mounting groove is provided with an annular inner groove, and multiple outer side surfaces of the outer baffle are attached to multiple inner walls of the annular inner groove.

[0019] Optimally, the annular partition and the discharge nozzle are integrally formed, the bottom plate is arranged near the periphery of the input end of the discharge channel, and the output end of the discharge nozzle and the guide needle block are both located outside the nozzle mounting groove.

[0020] Preferably, the flow channel body is provided with a plurality of feed channels, a drive accommodating cavity and the nozzle mounting groove; each of the nozzle mounting groove, the feed channel and the drive accommodating cavity are aligned in a straight line; the input end of the discharge channel is connected to the output end of the feed channel, and the valve needle passes through the feed channel; the output end of the telescopic actuator passes through the drive accommodating cavity and is connected to the valve needle;

[0021] The plurality of feed channels are connected to each other through a feeding channel.

[0022] Optimally, the telescopic drive is a cylinder.

[0023] A plastic injection molding device is provided with the above-mentioned flow channel structure for preventing valve needle deviation.

[0024] Compared with the prior art, one of the above technical solutions has the following beneficial effects:

[0025] This solution provides a flow channel structure that prevents the valve needle from deviating. A guide needle block is arranged in the discharge channel inside the discharge nozzle. The position of the valve needle is limited by a guide ring formed by multiple guide needle blocks. This can ensure that the valve needle always moves toward the output end of the discharge channel under the guidance of the guide surface, thereby improving the activity stability of the valve needle and solving the problem that the existing valve needle has low movement stability before and after heating and is easy to wear. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 1 is a schematic cross-sectional view of one embodiment of the flow channel structure;

[0027] Figure 2 yes Figure 1 A magnified schematic diagram of the middle part A;

[0028] Figure 3 is a cross-sectional perspective schematic diagram of one embodiment of the flow channel structure;

[0029] Figure 4 It is a structural schematic diagram of one embodiment of the discharge channel of the discharge nozzle.

[0030] in:

[0031] Flow channel body 1, discharge nozzle 2, telescopic driver 3, valve needle 4; annular spacer 5;

[0032] Nozzle mounting groove 11; annular inner groove 12; feed channel 13; drive accommodating chamber 14; feeding channel 15;

[0033] Discharge channel 21; guide needle block 22; feeding gap 23;

[0034] Feeding section 211, discharging section 212; guide curved surface 213;

[0035] Guide surface 221; guide ring opening 222; lower inclined surface 223; upper inclined surface 224;

[0036] Outer baffle 51, bottom plate 52; U-shaped partition 53. DETAILED DESCRIPTION

[0037] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0038] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", "inner end", "outer end", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships 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, rather than indicating or implying 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. In addition, features defined as "first" or "second" may explicitly or implicitly include one or more such features, and are used to distinguish and describe features, without distinction of order or importance. In the description of the present invention, unless otherwise specified, "multiple" means more than two.

[0039] like Figure 1-4 , a flow channel structure for preventing valve needle deviation, comprising: a flow channel body 1, a discharge nozzle 2, a telescopic driver 3 and a valve needle 4;

[0040] The discharge nozzle 2 is mounted on the flow channel body 1; a discharge channel 21 is provided inside the discharge nozzle 2; the telescopic actuator 3 is mounted on the flow channel body 1, and the output end of the telescopic actuator 3 is connected to the valve needle 4, for driving the valve needle 4 to retract and move in a resetting manner; the movement of the valve needle 4 in the discharge channel 21 is used to block or detach the output end of the discharge channel 21 through one end of the valve needle 4;

[0041] The discharge channel 21 is provided with guide needle blocks 22 distributed around the outer periphery of the valve needle 4, and a material passing gap 23 is formed between adjacent guide needle blocks 22; the guide needle blocks 22 are provided with guide surfaces 221 that abut against the outer side surface of the valve needle 4, and a guide ring opening 222 is formed around multiple guide surfaces 221, and the guide ring opening 222 is coaxially aligned with the output end of the discharge channel 21.

[0042] This solution provides a flow channel structure that prevents the valve needle from shifting. A guide needle block 22 is set in the discharge channel 21 in the discharge nozzle 2. The position of the valve needle 4 is limited by the guide ring opening 222 formed by multiple guide needle blocks 22, which can ensure that the valve needle 4 always moves toward the output end of the discharge channel 21 under the guidance of the guide surface 221, thereby improving the activity stability of the valve needle 4 and solving the problem that the existing valve needle 4 has low movement stability before and after heating and is easy to wear.

[0043] Specifically, the flow channel body 1 is used to receive the injection molding material. The injection molding material enters the input end of the discharge channel 21 through the flow channel body 1, and then passes through the output end of the discharge channel 21 to be output to the outside to complete the injection molding. During this period, the output end of the telescopic driver 3 can drive the valve needle 4 to move telescopically in the discharge channel 21. When the valve needle 4 moves to extend, the valve needle 4 can rest against the output end of the discharge channel 21, thereby blocking the discharge channel 21 and limiting the output of the injection molding material. When the valve needle 4 moves to retract, the valve needle 4 can be detached from the output end of the discharge channel 21, thereby exposing the output end of the discharge channel 21, and the injection molding material can be output to the outside through the discharge channel 21. In this embodiment, guide needle blocks 22 are provided on the inner wall of the discharge channel 21. The guide needle blocks 22 are distributed around the outer circumference of the valve needle 4. The guide surfaces 221 of the guide needle blocks 22 abut the outer side surface of the valve needle 4. When the guide surfaces 221 of multiple guide needle blocks 22 abut the valve needle 4, the guide surfaces 221 surround and form a guide ring 222. The guide ring 222 is aligned with the output end of the discharge channel 21. Therefore, the guide ring 222 can provide guidance for the guide needle blocks 22, ensuring that the position of the valve needle 4 can be restricted by the guide needle blocks 22 whether the discharge nozzle 2 is heated or unheated, ensuring that the valve needle 4 is always aligned with the output end of the discharge channel 21. The material gap 23 between the guide needle blocks 22 allows the injection molding material to pass through the guide needle blocks 22 from bottom to top to reach the output end of the discharge channel 21.

[0044] More specifically, when the discharge nozzle 2 is in thermal expansion, since the guide needle block 22 is part of the discharge nozzle 2, the discharge nozzle 2 will still press against the guide needle block 22 through the guide needle block 22 in the expanded state, thereby ensuring that the guide needle block 22 is always aligned with the output end of the discharge channel 21, and the valve needle 4 always moves along the guide surface 221 toward the output end of the discharge channel 21, thereby improving the activity stability of the valve needle 4 and solving the problem of low movement stability and easy wear of the existing valve needle 4 before and after heating.

[0045] Optimally, the guide needle block 22 is provided with a lower inclined surface 223 at one end away from the output end of the discharge channel 21, and an upper inclined surface 224 at the output end close to the discharge channel 21;

[0046] The lower inclined surface 223 transitions obliquely from the inner wall of the discharge channel 21 to one end of the guide surface 221 , and the upper inclined surface 224 transitions obliquely from the inner wall of the discharge channel 21 to the other end of the guide surface 221 .

[0047] In addition to providing a guide for the guide needle block 22, the guide needle block 22 can also avoid the problem of material accumulation in the guide area. Figure 2 The guide needle block 22 has a lower slope 223 below the guide surface 221. This lower slope 223 extends from the inner wall of the discharge channel 21 to the lower end of the guide surface 221, equivalent to the lower slope 223 extending from the bottom to the middle. Similarly, the guide needle block 22 has an upper slope 224 above the guide surface 221. This upper slope 224 extends from the inner wall of the discharge channel 21 to the upper end of the guide surface 221, equivalent to the upper slope 224 extending from the top to the middle. In this way, the lower slope 223 below the guide surface 221 can guide the injection molding material from the inner wall of the discharge channel 21 to the guide surface 221, preventing the injection molding material from accumulating below the guide needle block 22. At the same time, when the injection molding material is in the transition period between the guide surface 221 and the upper inclined surface 224, the upper inclined surface 224 can guide the injection molding material to transition from the guide ring mouth 222 to the inner wall of the discharge channel 21, and can also prevent the injection molding material from accumulating above the guide needle block 22, thereby providing a guiding effect on the valve needle 4 and preventing material accumulation.

[0048] Optimally, the discharge channel 21 includes, from the input end to the output end, a feed section 211 and a discharge section 212;

[0049] The feed section 211 is coaxially aligned with the discharge section 212, and the inner diameter of the feed section 211 is larger than the inner diameter of the discharge section 212; the discharge section 212 and the feed section 211 are transitioned by a guide curved surface 213; the lower inclined surface 223 is docked with the guide curved surface 213 at the end away from the guide surface 221.

[0050] The discharge channel 21 of this embodiment is designed to gradually narrow from bottom to top along its length, specifically from the larger inner diameter feed section 211 to the smaller inner diameter discharge section 212. This increases the pressure of the injection molding material as it flows toward the output end of the discharge channel 21, speeding up the flow of the injection molding material into the discharge section 212 and reducing the accumulation of injection molding material at the end of the guide needle block 22. Furthermore, the curved guide surface 213 is designed as an arcuate surface, which gradually narrows the feed section 211 to the discharge section 212, thus reducing material accumulation.

[0051] Optimally, it further comprises: an annular partition 5;

[0052] The annular spacer 5 is connected to the input end of the discharge nozzle 2;

[0053] The annular partition 5 includes: an outer baffle 51 and a bottom plate 52;

[0054] The discharge nozzle 2 is mounted on the bottom plate 52 at the input end; the outer baffle 51 is vertically mounted on the bottom plate 52 and surrounds the outer periphery of the discharge nozzle 2; a U-shaped partition 53 is formed between the outer wall of the discharge nozzle 2, the outer baffle 51 and the bottom plate 52;

[0055] The flow channel body 1 is provided with a nozzle mounting groove 11 , and the outer baffle 51 is fixed to the nozzle mounting groove 11 so that the discharge nozzle 2 is limited to the flow channel body 1 .

[0056] This solution preferably provides an annular partition 5 on the outer periphery of the discharge nozzle 2. The bottom plate 52 of the annular partition 5 serves as the mounting location for the discharge nozzle 2, while the outer baffle 51 is located on the outer periphery of the bottom plate 52. In this way, a U-shaped partition 53 is formed between the outer wall of the discharge nozzle 2, the outer baffle 51, and the bottom plate 52. The annular partition 5 only needs to be fixed to the outer baffle 51 to fix the annular partition 5 to the nozzle mounting groove 11, thereby indirectly fixing the discharge nozzle 2. In particular, because the nozzle mounting groove 11 is only fixed to the outer baffle 51, the U-shaped partition 53 can effectively separate the outer wall of the discharge nozzle 2 from the inner wall of the nozzle mounting groove 11. The flow channel body 1 will not directly contact the outer wall of the discharge nozzle 2, which can reduce the impact of the thermal expansion of the flow channel body 1 on the discharge channel 21, thereby maintaining the movable stability of the valve needle 4 and solving the problem of low stability and easy wear of the existing valve needle 4 when heated. At the same time, since the annular spacer 5 is located on the periphery of the input end of the discharge nozzle 2, that is, the output end of the discharge nozzle 2 and the guide needle block 22 are both far away from the nozzle mounting groove 11, the influence of the thermal expansion of the nozzle mounting groove 11 on the output end of the material nozzle and the guide needle block 22 can be reduced, thereby ensuring that the output end of the material nozzle and the guide needle block 22 remain evenly heated, and maintaining the activity stability of the valve needle 4.

[0057] Optimally, an inner annular groove 12 is provided on the inner wall of the nozzle mounting groove 11 , and multiple outer side surfaces of the outer baffle 51 are attached to multiple inner walls of the annular groove 12 .

[0058] The inner wall of the nozzle mounting groove 11 is provided with an annular inner groove 12 at a certain position; Figure 3The annular inner groove 12 has an inverted L-shape in cross section, and the outer baffle 51 has multiple outer side surfaces, such as a vertical outer side wall and a horizontal top wall. When the multiple outer side surfaces of the outer baffle 51 respectively abut against the inner wall of the annular inner groove 12, the contact position of the outer baffle 51 in the annular inner groove 12 can be increased, thereby improving the fixing stability of the annular spacer 5 in the annular inner groove 12 and reducing the impact of the annular inner groove 12 on the valve needle 4 of the discharge channel 21 during thermal expansion. Similarly, a groove body can also be provided on the inner wall of the annular inner groove 12 to fix the multiple surfaces of the outer side surface of the outer baffle 51 and improve the fixing stability.

[0059] Optimally, the annular partition 5 and the discharge nozzle 2 are integrally formed, the bottom plate 52 is arranged near the periphery of the input end of the discharge channel 21, and the output end of the discharge nozzle 2 and the guide needle block 22 are both located outside the nozzle mounting groove 11.

[0060] The annular partition 5 and the discharge nozzle 2 of this solution can be a split-type detachable combination; and in the optimal embodiment, the annular partition 5 and the discharge nozzle 2 are integrally formed and combined, and the two can be installed in the nozzle mounting groove 11 as a whole. Based on the fact that the output end and the guide needle block 22 of the discharge nozzle 2 both extend out of the nozzle mounting groove 11, the bottom plate 52 is close to the periphery of the input end of the discharge channel 21, and the thermal expansion of the flow channel body 1 only affects the outer baffle 51 of the annular partition 5, and the outer baffle 51 is separated from the outer side wall of the discharge nozzle 2 by a U-shaped partition groove 53. The U-shaped partition groove 53 can provide a buffering effect and an air-isolating effect, thereby maintaining the activity stability of the valve needle 4, solving the problem that the existing valve needle 4 has low stability in moving before and after heating and is easy to wear.

[0061] Optimally, the flow channel body 1 is provided with a plurality of feed channels 13, a drive accommodating cavity 14 and the nozzle mounting groove 11; each of the nozzle mounting groove 11, the feed channel 13 and the drive accommodating cavity 14 are aligned in a straight line; the input end of the discharge channel 21 is connected to the output end of the feed channel 13, and the valve needle 4 passes through the feed channel 13; the output end of the telescopic actuator 3 passes through the drive accommodating cavity 14 and is connected to the valve needle 4;

[0062] The plurality of feed channels 13 are connected to each other through a delivery channel 15 .

[0063] A single flow channel body 1 of the present scheme can be provided with multiple nozzle mounting grooves 11, and a feed channel 13 and a drive accommodating cavity 14 are correspondingly provided in each nozzle mounting groove 11; therefore, a single flow channel body 1 of the present scheme can simultaneously install multiple discharge nozzles 2, and each nozzle mounting groove 11, feed channel 13 and drive accommodating cavity 14 are aligned in a straight line, that is, each valve needle 4 can be independently extended and retracted, thereby independently controlling the switching state of the corresponding discharge nozzle 2, realizing large-area injection molding while ensuring the activity stability of multiple valve needles 4 under thermal expansion of the flow channel body 1; specifically, the injection molding raw material is output from the feeding channel 15 to the feed channel 13, passes between the inner wall of the feed channel 13 and the outer wall of the valve needle 4, and is then output to the discharge channel 21.

[0064] Optimally, the telescopic driver 3 is a cylinder.

[0065] The pneumatic cylinder is the optimal embodiment of the telescopic actuator 3 in this solution. It has two output states: extended and retracted, precisely ensuring the retractable and retractable valve needle 4. Furthermore, the cylinder's fast response speed, allowing for rapid extension and retraction, reduces switching time and prevents material residue during switching.

[0066] A plastic injection molding device is provided with a flow channel structure for preventing valve needle deviation according to any of the above embodiments.

[0067] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A flow channel structure for preventing valve needle deviation, characterized in that: include: Runner body, discharge nozzle, telescopic actuator and valve needle; The discharge nozzle is installed on the flow channel body; a discharge channel is provided inside the discharge nozzle; The telescopic driver is mounted on the flow channel body, and the output end of the telescopic driver is connected to the valve needle, for driving the valve needle to retract and move reliably; the movement of the valve needle in the discharge channel is used to block or detach from the output end of the discharge channel through one end of the valve needle; The discharge channel is provided with guide needle blocks distributed around the outer periphery of the valve needle, and a material passing gap is formed between adjacent guide needle blocks; the guide needle block is provided with a guide surface that abuts against the outer side surface of the valve needle, and a guide ring opening is formed around multiple guide surfaces, and the guide ring opening is coaxially aligned with the output end of the discharge channel.

2. A flow channel structure for preventing valve needle deviation according to claim 1, characterized in that: The guide needle block is provided with a lower slope at one end away from the output end of the discharge channel, and an upper slope at the output end close to the discharge channel; The lower slope transitions obliquely from the inner wall of the discharge channel to one end of the guide surface, and the upper slope transitions obliquely from the inner wall of the discharge channel to the other end of the guide surface.

3. A flow channel structure for preventing valve needle deviation according to claim 2, characterized in that: The discharge channel includes, from the input end to the output end, a feed section and a discharge section; The feed section is coaxially aligned with the discharge section, and the inner diameter of the feed section is larger than the inner diameter of the discharge section; the discharge section and the feed section are transitioned by a guide curved surface; the lower inclined surface is butted against the guide curved surface at the end away from the guide surface.

4. The flow channel structure for preventing valve needle deviation according to claim 1, characterized in that: Also includes: Ring partition; The annular partition is connected to the input end of the discharge nozzle; The annular partition includes: an outer baffle and a bottom plate; The discharge nozzle is mounted on the bottom plate at the input end; the outer baffle is vertically mounted on the bottom plate and surrounds the outer periphery of the discharge nozzle; a U-shaped partition is formed between the outer side wall of the discharge nozzle, the outer baffle and the bottom plate; The flow channel body is provided with a nozzle mounting groove, and the outer baffle is fixed to the nozzle mounting groove so that the discharge nozzle is limited to the flow channel body.

5. A flow channel structure for preventing valve needle deviation according to claim 4, characterized in that: An annular inner groove is provided on the inner wall of the nozzle mounting groove, and multiple outer side surfaces of the outer baffle are attached to multiple inner walls of the annular inner groove.

6. The flow channel structure for preventing valve needle deviation according to claim 4, characterized in that: The annular partition and the discharge nozzle are integrally formed, the bottom plate is arranged near the periphery of the input end of the discharge channel, and the output end of the discharge nozzle and the guide needle block are both located outside the nozzle mounting groove.

7. A flow channel structure for preventing valve needle deviation according to claim 6, characterized in that: The flow channel body is provided with a plurality of feed channels, a drive accommodating cavity and the nozzle mounting groove; each of the nozzle mounting groove, the feed channel and the drive accommodating cavity is aligned in a straight line; the input end of the discharge channel is connected to the output end of the feed channel, and the valve needle passes through the feed channel; The output end of the telescopic actuator passes through the drive accommodating cavity and is connected to the valve needle; The plurality of feed channels are connected to each other through a feeding channel.

8. The flow channel structure for preventing valve needle deviation according to claim 6, characterized in that: The telescopic driver is a cylinder.

9. A plastic injection molding device, characterized in that: A flow channel structure for preventing valve needle deviation according to any one of claims 1 to 8 is provided.

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