Nozzle structure capable of preventing melt from flowing back

Abstract

The utility model discloses a nozzle structure for preventing melt backflow, which comprises a charging barrel spray pipe and a nozzle body, the nozzle body comprises a nozzle end and a connecting end, a connecting pipe is connected between the nozzle end and the connecting end, one end of the connecting end is welded with a mounting flange, and the other end of the connecting end is welded with a connecting pipe. A flow guide part is fixedly installed at the position, located on the inner ring of the installation flange, of one end of the connecting end, an installation groove is formed in the inner wall of the flow guide part, a fixing shaft is fixedly installed on the installation groove, a blocking block is installed at the bottom of the fixing shaft, and the blocking block and the fixing shaft are connected and installed through an overturning ring. In the flow guide process, melt pushes the blocking block to turn over, so that the melt circulates in the nozzle body, and when material guide is stopped, the melt flows back under the condition of negative pressure, extrudes the blocking block and blocks the backflow channel, so that the backflow condition is avoided.

Description

Technical Field

[0001] This utility model belongs to the field of injection molding machine technology, specifically relating to a nozzle structure that prevents molten material backflow. Background Technology

[0002] Injection molding machines, also known as injection molding machines or injection molding machines, are the main molding equipment used to produce various shapes of plastic products from thermoplastic or thermosetting plastics using plastic molds. They are classified as vertical, horizontal, and all-electric. Injection molding machines heat the plastic, apply high pressure to the molten plastic, and inject it to fill the mold cavity.

[0003] Domestic invention patent application number 201911345109.8 discloses a nozzle for injection molding machines that prevents backflow. The nozzle includes a connecting pipe, a spray head, a ball bearing, a fan blade, an auger, and a cast aluminum heating coil for the injection molding machine nozzle. A first limiting block is integrally formed on the outer side of the connecting pipe, and an external thread is integrally formed on the right outer side of the connecting pipe. A feed inlet is opened on the right side of the inner side of the connecting pipe, and the spray head is threaded to the left side of the connecting pipe. A slide rail is disposed inside a slide groove. The cast aluminum heating coil for the injection molding machine nozzle is nested on the outer side of both the connecting pipe and the spray head. This nozzle for injection molding machines that prevents backflow is equipped with a fan blade and an auger. During use, the fan blade is impacted by the liquid, causing the inner guide pipe to rotate, which in turn causes the inner guide pipe to drive the auger to rotate. This not only effectively stirs the plastic solution but also prevents blockage of the plastic solution. Furthermore, after injection molding, the auger design effectively prevents liquid backflow. The invention has a complex structure. The negative pressure generated by the reflow will affect the internal auger, causing it to rotate in the opposite direction, thereby accelerating the flow of the reflow melt. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a nozzle structure to prevent molten material backflow, including a material cylinder nozzle pipe and a nozzle body. The nozzle body includes a nozzle end and a connecting end, and a connecting pipe is installed between the nozzle end and the connecting end. A mounting flange is welded to one end of the connecting end, and a flow guide is fixedly installed on the inner ring of the mounting flange at one end of the connecting end. An installation groove is formed on the inner wall of the flow guide, and a fixed shaft is fixedly installed on the installation groove. A blocking block is installed at the bottom of the fixed shaft, and the blocking block and the fixed shaft are connected and installed through a flip ring.

[0005] As a further preferred technical solution of this utility model; the connecting pipe is provided with a movable end and a positioning end at both ends respectively, a connecting part is installed around the outer edge of the nozzle end, and a snap-fit ​​end is connected and installed around the inner edge of the connecting part, and a movable groove is opened on the inner side of the snap-fit ​​end, the movable end is installed inside the movable groove, a fixing part is installed around the outer edge of the connecting end, an auxiliary groove is opened inside the fixing part, the positioning end is installed inside the auxiliary groove, the outer wall of the movable end is fitted with the inner wall of the connecting part, and the outer wall of the positioning end is fitted with the fixing part.

[0006] During material feeding, the molten material is injected into the mold from the nozzle position of the nozzle body. When the molten material enters the nozzle body, the pressure inside the nozzle body increases, which increases the pressure between the nozzle end and the connecting end of the connecting pipe. The auxiliary groove plays a buffering role in this pressure to avoid affecting the position of the nozzle body. When the screw is pulled to stop feeding, the pressure inside the cavity causes the connecting pipe to be buffered in the movable groove, reducing the possibility of the molten material flowing back due to the negative pressure inside the cavity.

[0007] As a further preferred technical solution of this utility model, a spray hole is provided at the end of the nozzle body, and a nozzle cavity is provided inside the nozzle body.

[0008] The inner wall of the nozzle cavity is curved, which reduces the amount of flowing melt sticking to the inner wall of the nozzle body and reduces melt waste.

[0009] As a further preferred technical solution of this utility model, the mounting flange has multiple sets of mounting holes, and a docking flange is welded to one end of the material cylinder nozzle. The mounting flange is installed and docked with the docking flange by means of fixing bolts passing through the mounting holes.

[0010] Threaded connections may loosen under repeated thermal expansion and contraction, leading to leaks. Flange connections, on the other hand, are better able to adapt to such changes due to the tightness of the bolts and the elasticity of the gaskets.

[0011] As a further preferred technical solution of this utility model, a high-temperature resistant sealing ring is installed on the connecting end at the mounting flange position.

[0012] The high-temperature resistant sealing ring is made of high-temperature resistant ceramic material, which has excellent sealing performance.

[0013] As a further preferred technical solution of this utility model, a piston end is installed on one side of the blocking block, and the piston end is connected to the through-hole opened inside the guide section.

[0014] When the molten material is pushed to move inside the nozzle, the piston end pushes out towards the nozzle body end. The piston is mounted on the outside of the fixed shaft through a flipping ring, which causes the blocking block to flip, so that the molten material is ejected from the nozzle.

[0015] Beneficial effects

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] 1. During material feeding, the molten material is injected into the mold from the nozzle position of the nozzle body. When the molten material enters the nozzle body, the pressure in the inner cavity of the nozzle body increases, which increases the pressure between the nozzle end and the connecting end of the connecting pipe. The auxiliary groove plays a buffering role in this pressure to avoid affecting the position of the nozzle body. When the screw is pulled to stop feeding, the pressure in the inner cavity causes the connecting pipe to be buffered in the movable groove, reducing the backflow of molten material due to the negative pressure in the inner cavity.

[0018] 2. A fixed shaft is fixedly installed on the mounting groove, and a blocking block is installed at the bottom of the fixed shaft. The blocking block and the fixed shaft are connected by a flip ring. During the flow guiding process, the molten material pushes the blocking block to flip, so that the molten material flows in the nozzle body. When the material guiding stops, the molten material flows back under negative pressure, squeezing the blocking block and blocking it to block the backflow channel, thereby preventing backflow. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0021] Figure 3 for Figure 2 Enlarged structural diagram at point A;

[0022] Figure 4 for Figure 2 A magnified structural diagram at point B in the middle.

[0023] In the diagram: 1. Nozzle body; 11. Nozzle orifice; 12. Mounting flange; 13. Mounting hole; 14. Nozzle end; 141. Snap-fit ​​end; 142. Movable groove; 143. Connecting part; 15. Connecting end; 151. High-temperature resistant sealing ring; 152. Mounting groove; 153. Auxiliary groove; 154. Guide part; 155. Fixing part; 16. Nozzle chamber; 17. Connecting pipe; 171. Positioning end; 172. Movable end; 2. Material cylinder spray pipe; 21. Connecting flange; 3. Fixed shaft; 31. Barrier block; 32. Piston end; 33. Rotating ring. Detailed Implementation

[0024] This specific embodiment is a nozzle structure that prevents molten material from flowing back.

[0025] The invention has a complex structure. The negative pressure generated by the reflow will affect the internal auger, causing it to rotate in the opposite direction, thereby accelerating the flow of the reflow melt.

[0026] Its structural diagram is as follows Figures 1-4 As shown. A nozzle structure for preventing molten material backflow includes a barrel nozzle 2 and a nozzle body 1. The nozzle body 1 includes a nozzle end 14 and a connecting end 15. A connecting pipe 17 is installed between the nozzle end 14 and the connecting end 15. The connecting pipe 17 has a movable end 172 and a positioning end 171 at its two ends, respectively. A connecting portion 143 is installed around the outside of the nozzle end 14, and a snap-fit ​​end 141 is installed around the inside of the connecting portion 143. A movable groove 142 is formed on the inner side of the snap-fit ​​end 141. The movable end 172 is installed inside the movable groove 142. A fixing portion 155 is installed around the outside of the connecting end 15. An auxiliary groove 153 is formed inside the fixing portion 155. The positioning end 171 is installed inside the auxiliary groove 153. The outer wall of the movable end 172 fits against the inner wall of the connecting portion 143, and the outer wall of the positioning end 171 fits against the fixing portion 155. During material feeding, the molten material is injected into the mold from the nozzle position of the nozzle body 1. When the molten material enters the nozzle body 1, the pressure inside the nozzle body 1 increases, increasing the pressure between the connecting pipe 17 at the nozzle end 14 and the connecting end 15. The auxiliary groove 153 buffers this pressure, preventing it from affecting the position of the nozzle body 1. When the screw is pulled to stop feeding, the pressure inside the cavity causes the connecting pipe 17 to buffer within the movable groove 142, reducing the backflow of molten material due to the negative pressure inside the cavity. The nozzle body 1 has a spray hole 11 at one end and a nozzle cavity 16 inside. The inner wall of the nozzle cavity 16 is curved, reducing the amount of flowing molten material hanging on the inner wall of the nozzle body 1 and reducing molten material waste. A mounting flange 12 is welded to one end of the connecting end 15. The mounting flange 12 has multiple sets of mounting holes 13. A docking flange 21 is welded to one end of the material cylinder nozzle 2, and the mounting flange 12 is installed and docked with the docking flange 21 by fixing bolts through the mounting holes 13. Threaded connections may loosen under repeated thermal expansion and contraction, leading to leaks. Flange connections, due to the tightness of the bolts and the elasticity of the gasket, are better able to adapt to such changes. A high-temperature resistant sealing ring 151 is installed on the connection end 15 at the flange 12 position. The high-temperature resistant sealing ring 151 is made of high-temperature resistant ceramic material and has excellent sealing performance.

[0027] One end of the connecting end 15 is fixedly mounted with a flow guide 154 on the inner ring of the mounting flange 12. An installation groove 152 is formed on the inner wall of the flow guide 154, and a fixed shaft 3 is fixedly mounted on the installation groove 152. A blocking block 31 is mounted on the bottom of the fixed shaft 3, and the blocking block 31 and the fixed shaft 3 are connected by a flip ring 33. A piston end 32 is mounted on one side of the blocking block 31, and the piston end 32 is connected to a through-hole inside the flow guide 154. When the molten material is pushed to move inside the nozzle nozzle 2, the piston end 32 pushes out towards the end of the nozzle body 1. The flip ring 33, installed outside the fixed shaft 3, causes the blocking block 31 to flip, achieving the effect of the molten material being ejected from the nozzle. During the flow guiding process, the molten material pushes the blocking block 31 to flip, allowing the molten material to flow within the nozzle body 1. When the flow guiding stops, the molten material flows back under negative pressure, squeezing the blocking block 31 and blocking the backflow channel, thus preventing backflow.

[0028] During the flow guiding process, the molten material pushes the blocking block 31 to flip, allowing the molten material to flow into the nozzle body 1. When the molten material enters the nozzle body 1, the pressure inside the nozzle body 1 increases, increasing the pressure between the connecting pipe 17 at the nozzle end 14 and the connecting end 15. The auxiliary groove 153 acts as a buffer for this pressure. When the flow guiding stops, the molten material flows back under negative pressure, squeezing the blocking block 31 to block the backflow channel. The pressure inside the nozzle body 1 causes the connecting pipe 17 to buffer within the movable groove 142, reducing the backflow of molten material due to the negative pressure inside the cavity.

[0029] All technical features in this embodiment can be freely combined according to actual needs.

[0030] The above embodiments are preferred implementations of this utility model. In addition, this utility model can also be implemented in other ways. Any obvious substitutions without departing from the concept of this technical solution are within the protection scope of this utility model.

Claims

1. A nozzle structure for preventing molten material backflow, comprising a barrel nozzle (2), characterized in that, It also includes a nozzle body (1), which includes a nozzle end (14) and a connecting end (15). A connecting pipe (17) is installed between the nozzle end (14) and the connecting end (15). A mounting flange (12) is welded to one end of the connecting end (15). A guide part (154) is fixedly installed on the inner ring of the mounting flange (12) at one end of the connecting end (15). An installation groove (152) is opened on the inner wall of the guide part (154). A fixed shaft (3) is fixedly installed on the installation groove (152), and a blocking block (31) is installed at the bottom of the fixed shaft (3). The blocking block (31) and the fixed shaft (3) are connected and installed through a flip ring (33).

2. The nozzle structure for preventing molten material backflow according to claim 1, characterized in that: The connecting pipe (17) has a movable end (172) and a positioning end (171) at both ends. A connecting part (143) is installed around the outside of the nozzle end (14), and a snap-fit ​​end (141) is connected and installed around the inside of the connecting part (143). A movable groove (142) is opened on the inner side of the snap-fit ​​end (141), and the movable end (172) is installed inside the movable groove (142). A fixing part (155) is installed around the outside of the connecting end (15), and an auxiliary groove (153) is opened inside the fixing part (155). The positioning end (171) is installed inside the auxiliary groove (153). The outer wall of the movable end (172) is in contact with the inner wall of the connecting part (143), and the outer wall of the positioning end (171) is in contact with the fixing part (155).

3. The nozzle structure for preventing molten material backflow according to claim 1, characterized in that: The nozzle body (1) has a spray hole (11) at one end and a nozzle cavity (16) inside the nozzle body (1).

4. The nozzle structure for preventing molten material backflow according to claim 1, characterized in that: The mounting flange (12) has multiple sets of mounting holes (13). One end of the material cylinder spray pipe (2) is welded with a docking flange (21), and the mounting flange (12) is installed and docked with the docking flange (21) by means of fixing bolts passing through the mounting holes (13).

5. The nozzle structure for preventing molten material backflow according to claim 1, characterized in that: A high-temperature resistant sealing ring (151) is installed on the connection end (15) at the location of the mounting flange (12).

6. The nozzle structure for preventing molten material backflow according to claim 1, characterized in that: A piston end (32) is installed on one side of the barrier block (31), and the piston end (32) is connected to the through-hole opened inside the guide part (154).

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