Inclined hole eccentric needle valve hot runner structure

Abstract

The invention relates to the field of needle valve hot runners, and discloses an inclined hole eccentric needle valve hot runner structure which comprises a top plate and a fixing plate, the top plate and the fixing plate are tightly attached, an inner runner is transversely formed between the top plate and the fixing plate, a nozzle body is vertically installed below one side of the fixing plate, the nozzle body penetrates through the lower surface of the fixing plate, and the nozzle body is connected with the inner runner. A pouring inclined hole is formed in the upper portion of one side in the nozzle body, the top of the pouring inclined hole communicates with one end of the inner flow channel, an inner channel is vertically formed in the nozzle body, a flow dividing lock is arranged at the bottom of the nozzle body, a plurality of auxiliary plates are arranged on the inner side of a cavity channel of the flow dividing lock, and a valve needle is limited through the auxiliary plates; the valve needle is located in the center of the cavity channel when moving up and down, friction between the valve needle and the bottom of the cavity channel is prevented, deviation caused by the influence of melt flowing is avoided, meanwhile, melt flows through gaps between the auxiliary plates, and it is guaranteed that internal melt flows smoothly in the working process.

Description

Technical Field

[0001] The invention relates to the technical field of needle valve hot runners, in particular to an oblique hole eccentric needle valve hot runner structure. Background Art

[0002] The needle valve hot runner is an advanced hot runner system for injection molds. The needle valve hot runner system drives the valve needle to move through a cylinder or an oil cylinder to control the opening and closing of the gate. During the injection molding process, after the plastic melt is injected into the hot runner system, the valve needle is in a closed state to prevent the melt from flowing into the cavity. When injection molding is required, the control system sends a signal to drive the valve needle to open, and the melt enters the cavity through the gate. After the injection molding is completed, the valve needle is closed again to prevent the melt from flowing back and wire drawing at the gate. In the prior art, the nozzle body inlet hole mostly adopts an inclined hole design to prevent dead material from forming on the back of the needle valve.

[0003] In order to ensure the smooth flow of the melt inside the nozzle, the cavity inside the nozzle must be larger than the size of the valve needle. This results in the bottom of the valve needle hanging inside the wall when the valve needle moves up to open. The flow of the melt will cause the bottom of the suspended valve needle to move and deviate, causing the coaxiality of the valve needle and the cavity to deviate. At this time, when the valve needle moves down to close, it will hit the bottom of the cavity, increasing friction. After long-term use, the sealing between the bottom of the nozzle and the needle valve is reduced, and leakage is likely to occur. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a hot runner structure of an inclined hole eccentric needle valve to solve the problem.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a hot runner structure of an inclined hole eccentric needle valve, comprising a top plate and a fixed plate, the top plate and the fixed plate are tightly fitted, an inner flow channel is horizontally opened between the top plate and the fixed plate, a nozzle body is vertically installed below one side of the fixed plate, the nozzle body passes through the lower surface of the fixed plate, an inclined pouring hole is opened above one side of the nozzle body, the top of the inclined pouring hole is connected with one end of the inner flow channel, an inner channel is vertically opened inside the nozzle body, the bottom of the inclined pouring hole is connected with the inner channel, a guide sleeve is screwed on the top of the nozzle body, a valve needle is vertically and slidably penetrated inside the nozzle body, a diverter lock is installed at the bottom of the nozzle body, an insert is embedded in the bottom of the diverter lock, the valve needle passes through the insert, at least three auxiliary plates are evenly arranged below the inside of the diverter lock, the valve needle is placed between the multiple auxiliary plates, and the top of the auxiliary plate is inclined downward near the center.

[0006] Furthermore, an inner concave ring is provided on the outer side of the insert, and the inner concave ring is placed below the outer side of the diverter lock.

[0007] Furthermore, an outer cylinder is installed outside the nozzle body, and a nozzle head sealing cap is screwed on the bottom of the outer cylinder. The nozzle head sealing cap seals the bottom of the outer cylinder, and the nozzle head sealing cap is in contact with the diverter lock and the nozzle body at the same time.

[0008] Furthermore, a heating sleeve is provided on the outer side of the nozzle body, the bottom of the heating sleeve is wrapped around the outer side of the diverter lock, and a notch is opened on one side of the heating sleeve.

[0009] Furthermore, locking sleeves are screwed on both the upper and lower ends of the heating sleeve, and a power cord is connected to one side of the top of the heating sleeve.

[0010] Furthermore, a driving unit is provided on one side of the top of the top plate, and the top of the valve needle is mounted on the driving unit.

[0011] Furthermore, a conical plug is provided on the surface of the valve needle, and the conical plug is placed inside the inner channel, and the upper surface of the conical plug is matched with the inner upper surface of the inner channel.

[0012] Furthermore, a fixing ring is provided at the center of the top of the top plate, a main nozzle is installed inside the fixing ring, and the bottom of the main nozzle is connected to the inner flow channel.

[0013] The present invention provides a hot runner structure of an inclined hole eccentric needle valve, which has the following beneficial effects:

[0014] 1. The present invention sets a diverter lock at the bottom of the nozzle body and sets a plurality of auxiliary plates on the inner side of the diverter lock cavity. The valve needle is limited by the plurality of auxiliary plates so that the valve needle is located at the center of the cavity when moving up and down, thereby preventing the valve needle from rubbing against the bottom of the cavity and not being affected by the flow of the melt and being offset. At the same time, the melt flows through the gaps between the auxiliary plates to ensure smooth internal melt flow during operation.

[0015] 2. The present invention embeds an insert at the bottom of the diverter lock to cooperate with the valve needle to reduce wear and facilitate replacement. At the same time, the insert adopts low thermal conductivity material to reduce heat conduction between the nozzle and the mold cavity, and an inner concave ring is provided on the outer side of the insert to further reduce heat transfer.

[0016] 3. The present invention provides a conical plug on the surface of the needle valve, so that when the nozzle is opened, the conical plug moves upward and fits tightly on the upper part of the inner channel to increase the fitting area, improve the sealing performance, and prevent the melt from leaking through the top. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the installation cross-sectional structure of the present invention;

[0018] Figure 2 It is a schematic diagram of the cross-sectional structure of the nozzle body of the present invention;

[0019] Figure 3 It is a schematic diagram of the cross-sectional three-dimensional structure of the diverter lock of the present invention;

[0020] Figure 4 For the present invention Figure 1 A schematic diagram of the enlarged three-dimensional structure of region A;

[0021] Figure 5 It is a schematic diagram of the heating jacket structure of the present invention.

[0022] Among them, 1. top plate; 2. fixed plate; 3. fixed ring; 4. main nozzle; 5. inner flow channel; 6. drive unit; 7. nozzle body; 71. inclined pouring hole; 72. inner channel; 8. guide sleeve; 9. valve needle; 91. conical plug; 10. nozzle head sealing cap; 11. diverter lock; 111. auxiliary plate; 12. insert; 121. concave ring; 13. heating sleeve; 131. notch; 132. locking sleeve; 133. power cord; 14. outer cylinder. DETAILED DESCRIPTION

[0023] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] Embodiment 1:

[0025] Please refer to Figure 1-Figure 4As shown, a hot runner structure of an inclined hole eccentric needle valve includes a top plate 1 and a fixed plate 2. The top plate 1 and the fixed plate 2 are tightly fitted by bolts. An inner flow channel 5 is horizontally opened between the top plate 1 and the fixed plate 2. The upper and lower fitting can ensure the sealing of the inner flow channel 5 to form a sealed cavity. A nozzle body 7 is vertically installed below one side of the fixed plate 2. The nozzle body 7 passes through the lower surface of the fixed plate 2. The bottom of the nozzle body 7 is connected to the mold cavity. An inclined pouring hole 71 is opened above one side of the nozzle body 7. The top of the inclined pouring hole 71 is connected to one end of the inner flow channel 5. The inclined pouring hole can prevent dead material from forming on the back of the valve needle 9. An inner channel 72 is vertically opened inside the nozzle body 7. The bottom of the inclined pouring hole 71 is connected to the inner channel 72, so that the melt can flow into the inner channel 72 through the inclined pouring hole 71. A guide sleeve 8 is screwed on the top of the nozzle body 7 to seal the top of the nozzle body 7. At the same time, the valve needle 9 is limited so that the valve needle 9 can only slide in the vertical direction. 7 is penetrated by a valve needle 9 for vertical sliding inside, and a diverter lock 11 is installed at the bottom of the nozzle body 7. The diverter lock 11 fits tightly with the nozzle body 7 for better thermal conductivity. An insert 12 is embedded at the bottom of the diverter lock 11, and the valve needle 9 penetrates the insert 12 to limit the bottom of the valve needle 9 and facilitate replacement, thereby increasing the service life of the equipment, reducing the wear on the valve needle 9, and maintaining a small distance from the mold cavity to prevent heat from flowing to the mold. At least three auxiliary plates 111 are evenly arranged below the diverter lock 11, and the number of auxiliary plates 111 should not be too many, otherwise it will affect the flow of the melt and cause obstruction to the melt. The valve needle 9 is placed between multiple auxiliary plates 111 to limit the valve needle 9, improve the concentricity when sliding up and down, and prevent the flow channel of the melt from shifting. The side near the center of the top of the auxiliary plate 111 is tilted downward to facilitate the installation of the valve needle 9, and the inclined surface can be used to guide it during installation so that the valve needle 9 is placed between multiple auxiliary plates 111.

[0026] Embodiment 2:

[0027] In this embodiment, the size and number of the diverter lock 11 and the auxiliary plate 111 are optimized and designed according to different production requirements and material properties, so as to improve the stability of the valve needle 9 and the fluidity of the melt.

[0028] - Design of the diverter lock 11:

[0029] - Diameter: Designed in three specifications: Φ18mm, Φ20mm and Φ22mm.

[0030] - Height: Unified at 15 mm to ensure a close fit with the nozzle body 7.

[0031] - Material: Made of high strength alloy steel to improve wear resistance and thermal conductivity.

[0032] - Design of auxiliary board 111:

[0033] - Quantity: Set to 3, 4 and 6 respectively.

[0034] -Thickness: 2mm.

[0035] - Width: 5mm.

[0036] - Length: 10mm.

[0037] - Gap: Depending on the number of auxiliary plates, the gaps are 4mm, 3mm and 2mm.

[0038] - Inclined angle: The top of the auxiliary plate is tilted downward near the center at an angle of 30 degrees to facilitate the flow of the melt and the limiting of the valve needle.

[0039] Comparative data and effect analysis:

[0040] In order to evaluate the influence of different size and quantity designs on equipment performance, several groups of experiments were conducted to compare the stability of valve needle 9, melt fluidity and product quality.

[0041] 1. Option 1:

[0042] - Diverter lock diameter: Φ18mm

[0043] - Number of auxiliary boards: 3

[0044] - Auxiliary plate gap: 4mm

[0045] - Experimental results:

[0046] - Valve needle stability: The valve needle 9 has a slight deviation when moving up and down, which may cause a decrease in sealing.

[0047] - Melt fluidity: The melt flows smoothly and the injection cycle is normal.

[0048] - Product quality: The product surface finish is good, but there are small dimensional deviations.

[0049] 2. Option 2:

[0050] - Diverter lock diameter: Φ20mm

[0051] - Number of auxiliary boards: 4

[0052] - Auxiliary plate gap: 3mm

[0053] - Experimental results:

[0054] - Valve needle stability: The valve needle 9 maintains good coaxiality and the stability is significantly improved.

[0055] - Melt fluidity: Flows smoothly without obvious resistance.

[0056] - Product quality: The product has high dimensional accuracy and excellent surface quality.

[0057] 3. Option 3:

[0058] - Diverter lock diameter: Φ22mm

[0059] - Number of auxiliary boards: 6

[0060] - Auxiliary plate gap: 2mm

[0061] - Experimental results:

[0062] - Valve needle stability: The stability of the valve needle 9 is optimal and the coaxiality deviation is minimal.

[0063] - Melt fluidity: Due to the excessive number of auxiliary plates and the small gap, the melt flow is hindered to a certain extent and the injection molding cycle is prolonged.

[0064] - Product quality: The product has problems of insufficient filling and surface defects.

[0065] Effect comparison:

[0066] - Valve needle stability:

[0067] - Option 1: There is a slight deviation and needs to be improved.

[0068] - Option 2: Good stability, meeting production requirements.

[0069] - Option 3: The best stability, but has a negative impact on liquidity.

[0070] - Melt fluidity:

[0071] - Option 1: The smoothest.

[0072] - Option 2: Smooth, no obvious obstacles.

[0073] - Option 3: Flow is obstructed, affecting production efficiency.

[0074] - Product quality:

[0075] - Option 1: Basically qualified, but the accuracy and surface quality need to be improved.

[0076] - Option 2: Best quality, with high standards of dimensional accuracy and surface quality.

[0077] - Option 3: There are quality issues and it does not meet the requirements.

[0078] in conclusion:

[0079] By comparison, it can be seen that the number of auxiliary plates 111 and the size of the diverter lock 11 have a significant impact on the stability of the valve needle 9 and the fluidity of the melt.

[0080] - Option 2 achieves the best balance between valve needle stability and melt fluidity and is recommended for practical applications.

[0081] - Although the melt fluidity of Option 1 is good, the valve needle is not stable enough, which may affect the sealing and product quality.

[0082] - Although option 3 has the highest valve needle stability, the melt fluidity is hindered, resulting in reduced product quality and production efficiency.

[0083] - Number of auxiliary plates: Using 4 auxiliary plates can ensure the stability of the valve needle without affecting the fluidity of the melt.

[0084] - Diverter lock size: Choose a diverter lock diameter of Φ20mm to provide sufficient support and flow channel space.

[0085] - Auxiliary plate gap: The gap is set to 3mm to ensure smooth flow of the melt and effectively limit the valve needle.

[0086] Actual application effect:

[0087] - Improve product quality: Products have high dimensional accuracy and good surface finish, meeting high quality requirements.

[0088] - Improve production efficiency: The melt flows smoothly, the injection cycle is stable, and the production efficiency is improved.

[0089] - Extend equipment life: The stability of the valve needle 9 is improved, wear is reduced, and equipment maintenance costs are reduced.

[0090] Summarize:

[0091] This embodiment achieves a balance between the stability of the valve needle 9 and the fluidity of the melt by optimizing the design of the size and number of the diverter lock 11 and the auxiliary plate 111, significantly improves product quality and production efficiency, and provides an effective reference for the design of the hot runner system.

[0092] Embodiment 3:

[0093] Please refer to Figure 3 and Figure 4 As shown, an inner concave ring 121 is provided on the outer side of the insert 12 . The insert 12 is made of a heat-conducting material to reduce heat transfer with the mold cavity. The inner concave ring 121 is placed below the outer side of the diverter lock 11 .

[0094] In this embodiment, the material selection of the insert 12 is studied in depth to optimize its performance and reduce heat conduction and wear. At the same time, the size of the inner concave ring 121 is precisely designed to further reduce heat transfer and improve the efficiency of the hot runner system.

[0095] 1. Material selection of insert 12:

[0096] The insert 12 is a key component between the valve needle 9 and the diverter lock 11. Its material properties have an important impact on the stability and life of the entire hot runner system. In order to find the best material, the following experiments were conducted to compare the performance of three different materials:

[0097] 1. Material A: Stainless steel (SUS304)

[0098] - Thermal conductivity: 16 W / (m·K)

[0099] - Hardness: HB 200

[0100] - Wear resistance: Average

[0101] - Experimental results:

[0102] - Thermal conductivity: Higher thermal conductivity makes it easier for heat to be transferred to the mold cavity, affecting mold temperature control.

[0103] - Wear condition: After 5000 uses, the surface of insert 12 showed obvious wear and needed to be replaced.

[0104] - Sealing performance: Good at the beginning, but the sealing performance decreases after wear.

[0105] 2. Material B: Titanium alloy (Ti-6Al-4V)

[0106] - Thermal conductivity: 7 W / (m·K)

[0107] - Hardness: HB 340

[0108] - Wear resistance: Good

[0109] - Experimental results:

[0110] - Thermal conductivity: Low thermal conductivity effectively reduces heat transfer and stabilizes the mold temperature.

[0111] - Wear condition: After being used 10,000 times, the surface of insert 12 is only slightly worn and can still be used.

[0112] - Sealing performance: Maintains good sealing performance for a long time and the sealing effect is stable.

[0113] 3. Material C: Ceramic material (zirconia, ZrO 2 )

[0114] - Thermal conductivity: 2 W / (m·K)

[0115] - Hardness: HV 1200

[0116] - Wear resistance: Excellent

[0117] - Experimental results:

[0118] - Thermal conductivity: Very low thermal conductivity, minimal heat transfer and optimal mold temperature control.

[0119] - Wear condition: After being used 20,000 times, there is no obvious wear on the surface of insert 12.

[0120] - Sealing performance: Excellent, but attention should be paid to the brittleness of ceramic materials.

[0121] Effect comparison:

[0122] - Thermal conductivity:

[0123] - Material A (stainless steel): More heat transfer, not conducive to mold temperature control.

[0124] - Material B (titanium alloy): moderate heat transfer and good mold temperature stability.

[0125] - Material C (ceramic material): Minimum heat transfer and best mold temperature control.

[0126] - Wear resistance:

[0127] - Material A: Average wear resistance, needs to be replaced frequently.

[0128] - Material B: Better wear resistance and longer service life.

[0129] - Material C: Excellent wear resistance and longest service life.

[0130] - Comprehensive performance:

[0131] - Material A: Average performance, low cost, but high maintenance cost.

[0132] - Material B: Better performance, cost-effective, suitable for most applications.

[0133] - Material C: Best performance, but higher material cost, suitable for high precision requirements.

[0134] in conclusion:

[0135] - Preferred material: Considering the heat conduction and wear resistance as well as the cost factor, it is recommended to use material B (titanium alloy Ti-6Al-4V) to make the insert 12.

[0136] - Special applications: For applications that require extremely high temperature control and wear resistance, material C (ceramic material) can be selected.

[0137] 2. Dimensional design of the inner concave ring 121:

[0138] The design of the inner concave ring 121 plays an important role in reducing heat transfer and reducing the mass of the insert 12. By conducting experiments on inner concave rings of different sizes, the following data are obtained:

[0139] 1. Option 1:

[0140] - Concave ring width (W): 1 mm

[0141] - Depth of concave ring (D): 0.5 mm

[0142] - Experimental results:

[0143] - Heat transfer reduction: 5%

[0144] - Insert weight reduction: 2%

[0145] - Structural strength: No significant impact

[0146] 2. Option 2:

[0147] - Concave ring width (W): 2 mm

[0148] - Depth of concave ring (D): 1 mm

[0149] - Experimental results:

[0150] - Heat transfer reduction: 10%

[0151] - Insert weight reduction: 5%

[0152] - Structural strength: slightly reduced, but still meets the requirements of use

[0153] 3. Option 3:

[0154] - Concave ring width (W): 3 mm

[0155] - Depth of concave ring (D): 1.5 mm

[0156] - Experimental results:

[0157] - Heat transfer reduction: 15%

[0158] - Insert weight reduction: 8%

[0159] - Structural strength: Significantly reduced, with the risk of fracture

[0160] Effect comparison:

[0161] - Reduced heat transfer: As the size of the concave ring increases, the heat transfer decreases, but the magnitude gradually decreases.

[0162] - Structural strength: If the inner concave ring is too large and the wall thickness of the insert 12 is reduced, it may lead to insufficient mechanical strength.

[0163] - Processing difficulty: The smaller the size, the higher the processing accuracy required and the higher the cost.

[0164] in conclusion:

[0165] - Optimized size: It is recommended to use the size of option 2, that is, the concave ring width is 2 mm and the depth is 1 mm.

[0166] - Reason: Under the premise of ensuring the structural strength of insert 12, heat transfer is effectively reduced and the processing difficulty is moderate.

[0167] Actual application effect:

[0168] - Heat control: The insert 12 made of titanium alloy is matched with the optimized concave ring 121 design, which reduces heat transfer by about 10%, makes the mold temperature control more precise, and stabilizes the product quality.

[0169] - Wear resistance: The service life of insert 12 is more than doubled, and maintenance and replacement costs are reduced.

[0170] - Production efficiency: The mold temperature is stable, the injection cycle is shortened, and the production efficiency is improved.

[0171] Optimization suggestions:

[0172] - Material selection: Based on actual needs and cost budget, titanium alloy materials are preferred, and ceramic materials can be considered in special circumstances.

[0173] - Dimension design: The size of the concave ring 121 should strike a balance between reducing heat transfer and ensuring structural strength. A design with a width of 2 mm and a depth of 1 mm is recommended.

[0174] Summarize:

[0175] This embodiment significantly improves the performance of the hot runner system, reduces heat transfer and component wear, improves product quality and production efficiency by optimizing the material of the insert 12 and the size of the inner concave ring 121, and provides a practical reference for the design and improvement of the hot runner system.

[0176] Additional Notes:

[0177] - Trade-off between material cost and performance: Although ceramic materials have advantages in performance, they are difficult to process and have high costs, so they need to be selected based on actual conditions.

[0178] - Improved processing technology: Precision processing technology is used to ensure the dimensional accuracy of the inner concave ring 121 to achieve the best performance effect.

[0179] - Long-term benefits: Although the optimized design may increase the initial cost, in the long run it can reduce maintenance costs, improve production efficiency, and have economic benefits.

[0180] Among them, an outer cylinder 14 is installed on the outside of the nozzle body 7, and a nozzle sealing cap 10 is screwed on the bottom of the outer cylinder 14. The nozzle sealing cap 10 seals the bottom of the outer cylinder 14. The outer cylinder 14 cooperates with the nozzle sealing cap 10 at the bottom to protect the interior, and it also facilitates the overall installation or disassembly of the nozzle body 7. The nozzle sealing cap 10 is in contact with the diverter lock 11 and the nozzle body 7 at the same time to improve the sealing performance.

[0181] Please refer to Figure 2 and Figure 5 As shown, a heating sleeve 13 is provided on the outside of the nozzle body 7, and the bottom of the heating sleeve 13 is wrapped around the outside of the diverter lock 11, so that the melt flowing through the inside of the nozzle body 7 can be heated by the heating sleeve 13, so that the melt is injected into the mold cavity at a certain temperature to ensure the fluidity of the melt. A notch 131 is provided on one side of the heating sleeve 13 to facilitate the overall installation of the heating sleeve 13.

[0182] Among them, locking sleeves 132 are screwed on the upper and lower ends of the heating sleeve 13. During installation, the heating sleeve 13 can be locked by the locking sleeves 132 at both ends. The locking sleeves 132 and the heating sleeve 13 cooperate with each other through tapered threads, which makes the heating sleeve 13 shrink inward when the locking sleeve 132 is screwed inward to improve the tightness with the nozzle body 7. A power cord 133 is connected to one side of the top of the heating sleeve 13 to facilitate its connection with an external power supply.

[0183] Please refer to Figure 1 As shown, a driving unit 6 is provided on one side of the top of the top plate 1. The driving unit 6 can be a device such as a cylinder, an oil cylinder, a linear motor, etc. that can perform linear positioning movement. The top of the valve needle 9 is installed on the driving unit 6 to drive the valve needle 9 to move axially.

[0184] Embodiment 4:

[0185] Please refer to Figure 2As shown, a conical plug 91 is provided on the surface of the valve needle 9, and the upper liquid inside the inner channel 72 is set to a conical structure. The conical plug 91 is placed inside the inner channel 72, and the upper surface of the conical plug 91 is matched with the inner upper surface of the inner channel 72. When the valve needle 9 is opened, the conical plug 91 fits tightly against the upper part of the inner channel 72, which can limit the maximum upward position of the valve needle 9 on the one hand, and increase the sealing performance on the other hand to prevent the internal melt from overflowing through the upper part.

[0186] In this embodiment, in order to further improve the sealing performance and durability of the valve needle 9, the conical plug 91 arranged on the surface of the valve needle 9 is optimized, its size parameters are specified in detail, and the conical plugs 91 made of different materials are experimentally compared to select the best material combination.

[0187] 1. Dimensional design of tapered plug 91:

[0188] The tapered plug 91 is a key component at the top of the valve needle 9. Its size design directly affects the sealing performance and the fluidity of the melt. Through multiple experiments and simulation analysis, the following sets of size parameters are determined:

[0189] 1. Option 1:

[0190] - Cone Angle (α): 60 degrees

[0191] - Large end diameter (D1): 5 mm

[0192] - Small end diameter (D2): 2 mm

[0193] - Height (H): 5 mm

[0194] - Experimental results:

[0195] - Sealing performance: Good, can effectively prevent melt leakage.

[0196] - Melt fluidity: Flows smoothly without obvious resistance.

[0197] - Needle movement: Smooth up and down movement without sticking.

[0198] 2. Option 2:

[0199] - Cone Angle (α): 70 degrees

[0200] - Large end diameter (D1): 6 mm

[0201] - Small end diameter (D2): 2 mm

[0202] - Height (H): 4 mm

[0203] - Experimental results:

[0204] - Sealing performance: Excellent, the sealing effect is further improved.

[0205] - Melt fluidity: Slight resistance, but does not affect normal flow.

[0206] - Valve needle movement: Smooth, but the contact area between the tapered plug and the upper part of the inner channel 72 increases, and the processing accuracy needs to be improved.

[0207] 3. Option 3:

[0208] - Cone Angle (α): 50 degrees

[0209] - Large end diameter (D1): 4 mm

[0210] - Small end diameter (D2): 2 mm

[0211] - Height (H): 6 mm

[0212] - Experimental results:

[0213] - Sealing performance: Generally, a small amount of melt leakage may exist.

[0214] - Melt Flow: Very smooth with minimal flow resistance.

[0215] - Needle movement: Smooth, with little resistance.

[0216] Effect comparison:

[0217] - Sealing performance:

[0218] - Option 1: The sealing performance is good and can meet general needs.

[0219] - Option 2: The best sealing performance, suitable for occasions with high sealing requirements.

[0220] - Option 3: The sealing performance is average and there may be a risk of leakage.

[0221] - Melt fluidity:

[0222] - Option 1: Good liquidity, no obvious obstacles.

[0223] - Option 2: Liquidity will decrease slightly, but it will not affect production.

[0224] - Option 3: The fluidity is optimal, which is conducive to improving production efficiency.

[0225] - Needle movement:

[0226] - Option 1 and Option 3: The valve needle moves smoothly and the resistance is moderate.

[0227] - Option 2: Due to the larger taper angle and the larger contact area, it is necessary to improve the processing accuracy to avoid jamming.

[0228] in conclusion:

[0229] - Preferred size: Taking into account the sealing performance and melt fluidity, it is recommended to adopt the size design of Option 1, that is, the cone angle is 60 degrees, the large end diameter is 5 mm, the small end diameter is 2 mm, and the height is 5 mm.

[0230] - Reason: Option 1 achieves a good balance between sealing performance and melt fluidity, the valve needle moves smoothly, and it is relatively easy to manufacture and process.

[0231] 2. Material selection and experimental comparison of tapered plug 91:

[0232] The material selection of the tapered plug 91 has a direct impact on its wear resistance, sealing performance and service life. In order to find the best material, the following experiments were conducted to compare the performance of three different materials:

[0233] 1. Material A: High Speed ​​Steel (HSS)

[0234] - Hardness: HRC 62

[0235] - Wear resistance: Excellent

[0236] - Thermal conductivity: 24 W / (m·K)

[0237] - Experimental results:

[0238] - Wear resistance: No noticeable wear after 10,000 uses.

[0239] - Sealing performance: Maintains good sealing performance for a long time.

[0240] - Processing performance: The processing is difficult and the cost is high.

[0241] 2. Material B: Cemented carbide (tungsten steel, WC-Co)

[0242] - Hardness: HRA 89

[0243] - Wear resistance: Very good

[0244] - Thermal conductivity: 60 W / (m·K)

[0245] - Experimental results:

[0246] - Wear resistance: After 20,000 uses, there is no sign of wear on the surface.

[0247] - Sealing performance: Excellent, long-term stable.

[0248] - Processing performance: It is difficult to process and requires precision grinding, which is costly.

[0249] 3. Material C: Stainless steel (SUS440C)

[0250] - Hardness: HRC 58

[0251] - Wear resistance: Good

[0252] - Thermal conductivity: 24 W / (m·K)

[0253] - Experimental results:

[0254] - Wear resistance: After 5000 times of use, the surface shows slight wear.

[0255] - Sealing performance: Good at the beginning, but the sealing performance decreases after wear.

[0256] - Processing performance: Easy to process and low cost.

[0257] Effect comparison:

[0258] - Wear resistance:

[0259] - Material A: Excellent wear resistance, suitable for high frequency use.

[0260] - Material B: Best wear resistance and longest service life.

[0261] - Material C: Moderate wear resistance, suitable for light load applications.

[0262] - Sealing performance:

[0263] - Materials A and B: Long-term stable sealing performance.

[0264] - Material C: Sealing performance deteriorates over time.

[0265] - Processing cost:

[0266] - Materials A and B: Difficult to process and high cost.

[0267] - Material C: Easy to process and low cost.

[0268] in conclusion:

[0269] - Preferred materials: It is recommended to use material A (high speed steel) to make tapered plug 91.

[0270] - Reason: High-speed steel has excellent wear resistance and sealing performance. Although the processing cost is high, it has a high cost-effectiveness considering the service life and performance.

[0271] - Alternative materials: For occasions with extremely high frequency of use and extremely high requirements for wear resistance, material B (hard alloy) can be selected, but the processing cost and difficulty must be considered.

[0272] Actual application effect:

[0273] - Improved sealing performance: The optimized tapered plug 91 is used to significantly improve the sealing performance, prevent melt leakage and improve product quality.

[0274] - Extended service life: After adopting high-speed steel material, the wear resistance of the tapered plug 91 is improved, the service life is extended by more than double, and the frequency of maintenance and replacement is reduced.

[0275] - Improved production efficiency: The movement of the valve needle 9 is smoother, the melt fluidity is good, the injection cycle is stable, and the production efficiency is improved.

[0276] Optimization suggestions:

[0277] - Dimensional accuracy control: When manufacturing the tapered plug 91 , the dimensional accuracy, especially the taper angle and the large end diameter, should be strictly controlled to ensure a close fit with the inner channel 72 .

[0278] - Material heat treatment: The tapered plug 91 made of high-speed steel is subjected to appropriate heat treatment to further improve its hardness and wear resistance.

[0279] - Surface treatment: The surface of the tapered plug 91 may be subjected to surface treatment such as titanium plating to further improve wear resistance and corrosion resistance.

[0280] Summarize:

[0281] This embodiment optimizes the size and material of the tapered plug 91 provided on the surface of the valve needle 9, significantly improving the sealing performance and durability of the hot runner system, and improving product quality and production efficiency. By comparing experimental data, the optimal size parameters and material selection are determined, providing strong technical support for practical applications.

[0282] Additional Notes:

[0283] - Improvement of processing technology: Use high-precision CNC processing equipment to ensure the dimensional accuracy and surface quality of the tapered plug 91.

[0284] - Cost-benefit analysis: Although the use of high-speed steel materials and precision machining may increase the initial cost, the overall cost will be reduced in terms of long-term service life and performance improvement.

[0285] - Regular maintenance: It is recommended to regularly check the status of the valve needle 9 and the tapered plug 91, and perform maintenance and replacement in a timely manner to ensure long-term stable operation of the equipment.

[0286] Please refer to Figure 1 As shown, a fixing ring 3 is arranged at the top center of the top plate 1, a main nozzle 4 is installed inside the fixing ring 3, and the bottom of the main nozzle 4 is connected with the inner flow channel 5 to facilitate the connection of the device with the melt injection device.

[0287] Working principle: When in use, the top plate 1 and the fixed plate 2 are sealed and connected by bolts, and the equipment is connected to the raw material machine, so that the raw material can flow into the inner flow channel 5 through the main nozzle 4, and then flow into the inner channel 72 through the pouring inclined hole 71. The valve needle 9 is controlled to move up and down by the driving unit 6 on the top. When the valve needle 9 is placed at the bottom and exceeds the lower end surface of the insert 12, its bottom can be sealed. When it is necessary to discharge the material, the valve needle 9 is controlled to move up to make it higher than the insert 12. Since the bottom of the diverter lock 11 is funnel-shaped, when the valve needle 9 moves up The raw material can flow downward to realize the discharging operation. When the valve needle 9 moves up and down, the bottom is always limited by multiple auxiliary plates 111 to ensure that the valve needle 9 always maintains coaxiality with the inner channel 72 when moving up and down, to prevent the valve needle 9 from hitting the bottom due to eccentricity. At the same time, an inner concave ring 121 is provided on the outer surface of the insert 12 to prevent heat from being easily transferred to the mold cavity. When discharging, the upward movement of the valve needle 9 can make the conical plug 91 close to the upper part of the inner channel 72, thereby increasing the close fitting area, improving the sealing and preventing leakage.

[0288] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A hot runner structure of an inclined hole eccentric needle valve, comprising a top plate (1) and a fixed plate (2), wherein the top plate (1) and the fixed plate (2) are tightly fitted, and characterized in that: An inner flow channel (5) is horizontally opened between the top plate (1) and the fixed plate (2); a nozzle body (7) is vertically installed below one side of the fixed plate (2); the nozzle body (7) penetrates the lower surface of the fixed plate (2); an inclined pouring hole (71) is opened above one side of the inside of the nozzle body (7); the top of the inclined pouring hole (71) is connected to one end of the inner flow channel (5); an inner channel (72) is vertically opened inside the nozzle body (7); the bottom of the inclined pouring hole (71) is connected to the inner channel (72); the nozzle body (7) A guide sleeve (8) is screwed on the top, a valve needle (9) is vertically slidably penetrated inside the nozzle body (7), a diverter lock (11) is installed at the bottom of the nozzle body (7), an insert (12) is embedded in the bottom of the diverter lock (11), the valve needle (9) penetrates the insert (12), at least three auxiliary plates (111) are evenly arranged below the inside of the diverter lock (11), the valve needle (9) is placed between the multiple auxiliary plates (111), and the top of the auxiliary plate (111) is tilted downward near the center.

2. The hot runner structure of an inclined hole eccentric needle valve according to claim 1, characterized in that: An inner concave ring (121) is provided on the outer side of the insert (12), and the inner concave ring (121) is placed below the outer side of the diverter lock (11).

3. The hot runner structure of an inclined hole eccentric needle valve according to claim 1, characterized in that: An outer cylinder (14) is installed on the outside of the nozzle body (7), and a nozzle head sealing cap (10) is screwed onto the bottom of the outer cylinder (14). The nozzle head sealing cap (10) is sealed to the bottom of the outer cylinder (14), and the nozzle head sealing cap (10) is in contact with the diverter lock (11) and the nozzle body (7) at the same time.

4. The hot runner structure of an inclined hole eccentric needle valve according to claim 1, characterized in that: The outer side of the nozzle body (7) is provided with a heating sleeve (13), the bottom of the heating sleeve (13) is wrapped around the outer side of the diverter lock (11), and a notch (131) is provided on one side of the heating sleeve (13).

5. The hot runner structure of an inclined hole eccentric needle valve according to claim 4, characterized in that: The upper and lower ends of the heating sleeve (13) are both screwed with locking sleeves (132), and one side of the top of the heating sleeve (13) is connected to a power line (133).

6. The hot runner structure of an inclined hole eccentric needle valve according to claim 1, characterized in that: A drive unit (6) is provided on one side of the top of the top plate (1), and the top of the valve needle (9) is mounted on the drive unit (6).

7. The hot runner structure of an inclined hole eccentric needle valve according to claim 1, characterized in that: A conical plug (91) is provided on the surface of the valve needle (9), and the conical plug (91) is placed inside the inner channel (72). The upper surface of the conical plug (91) is matched with the inner upper surface of the inner channel (72).

8. The hot runner structure of an inclined hole eccentric needle valve according to claim 1, characterized in that: A fixing ring (3) is arranged at the top centre of the top plate (1), a main nozzle (4) is installed inside the fixing ring (3), and the bottom of the main nozzle (4) is connected to the inner flow channel (5).

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