Polypropylene high-strength composite injection molding equipment

Abstract

The application relates to the technical field of plastic processing, and discloses a polypropylene high-strength composite material injection molding equipment for injection molding, which comprises a heating box, a hot melting cavity and a push cavity are arranged in the heating box, a nozzle is arranged at one end of the heating box close to the push cavity, a valve seat is arranged in the push cavity, a valve plate is arranged on the valve seat to block, a piston is arranged on one side of the valve seat, and a hysteresis rod is sleeved on the piston. The hysteresis rod pushes the valve plate to open the valve seat, the piston can push the material out of the nozzle, the valve has a counterforce on the hysteresis rod, spring I is compressed, when the piston is retracted, the hysteresis rod moves in the same direction, but the speed of the hysteresis rod is smaller than that of the piston due to the influence of spring I, the valve is still in the open state within a certain time, the material at the nozzle can move a distance to the position of the valve, saliva flow is avoided, and air intake is reduced.

Description

Technical Field

[0001] This application relates to the field of plastic processing technology, and in particular to an injection molding equipment for high-strength polypropylene composite injection molded parts. Background Technology

[0002] Polypropylene, abbreviated as PP, is a polymer formed by the addition polymerization of propylene. Its melting point is 164 to 170°C. When using polypropylene as a raw material for injection molding, the polypropylene raw material needs to be added to the injection molding machine. One type of injection molding machine is the plunger-type injection molding machine. It mainly feeds the raw material into the barrel of the injection molding machine through the hopper and controls the temperature in the barrel at about 270°C to heat the solid polypropylene raw material into a molten state. At the same time, a torpedo-shaped diverter is added to the barrel. When the plunger pushes the molten polypropylene out of the barrel, the flowing molten polypropylene will flow through the outside of the diverter, so that the material is divided into thin layers, which diverts the material to accelerate heat transfer, increase flow rate, increase shear rate, and reduce viscosity. Then, the material re-enters after passing through the diverter and is injected into the mold from the nozzle.

[0003] In this process, since there is only one diversion shuttle in the barrel, the solid material in the barrel relies entirely on the heat transfer from the electric heating device on the outside of the barrel to melt within a unit of time. The melting effect is poor. When the plunger pushes the molten polypropylene material forward through the diversion shuttle, the material is in a mixed state of solid and molten. The material passes through the diversion shuttle for a short time, which means that to completely heat the solid material into a molten state, it is necessary to extend the time the material spends in the barrel. At the same time, the diversion shuttle only thins and accelerates the material without any additional stirring effect. This means that when other mixed materials are added to the material, they cannot be effectively mixed. Furthermore, as the plunger squeezes the material into the mold and then returns to its original position, the space inside the barrel will increase. At this time, the material at the nozzle will flow into the barrel under the suction of the plunger's return. Although this will prevent the molten material in the nozzle from flowing out of the nozzle after leaving the mold, a large amount of outside air will also be drawn into the nozzle and barrel, resulting in an increase in the gas content of the material in the barrel, which will affect the quality of the finished product. Summary of the Invention

[0004] This application proposes an injection molding equipment for high-strength polypropylene composite injection molded parts. It features a hysteresis rod that opens a valve, allowing material to exit the nozzle. The valve's reaction force compresses spring I on the hysteresis rod. When the piston moves backward, it drives the hysteresis rod to move synchronously. The compressed spring I causes the hysteresis rod to move slowly, causing the valve seat to close slowly. The piston's backward movement draws material from the nozzle and retracts a short distance. The piston's reciprocating motion causes the material to be divided within a diversion orifice, splitting large-volume material into smaller-volume streams for direct heating. A power protrusion and friction receiving protrusion on the hydraulic rod lift the mixing layer, which, in conjunction with spring III, causes adjacent mixing layers to bounce up and down alternately. This bouncing of the mixing layers causes the divided material to stratify, improving the shear mixing effect. The piston pushes the mixing layer, and spring IV alters the space between adjacent mixing layers. This design addresses the problems of poor heat melting effect, low mixing efficiency, and high gas content in existing plunger-type injection molding machines.

[0005] To achieve the above objectives, this application adopts the following technical solution: an injection molding equipment for high-strength polypropylene composite injection molded parts, comprising a heating box, wherein a hot melt chamber and an injection chamber are provided inside the heating box, and a nozzle is provided at one end of the heating box near the injection chamber for extruding material into the injection chamber into the mold; a hydraulic cylinder is provided at one end of the heating box near the funnel, a hydraulic rod is sleeved inside the hydraulic cylinder, and a piston is provided at one end of the hydraulic rod located inside the injection chamber for driving the flow of material in the hot melt chamber and the injection chamber; a valve seat is provided inside the injection chamber, and the valve seat... The piston has a central through-hole section with a valve plate for sealing. The valve seat is located between the piston and the nozzle, dividing the injection chamber into two spaces. Two symmetrical positioning blocks are located in the middle of the valve seat. A spring II is connected to the end of the positioning block away from the piston, and the other end of the spring II is connected to the valve plate to pull the valve plate and block the valve seat. The piston has a movable cavity with a spring I and a hysteresis rod inside. The movable cavity provides space and elasticity for the hysteresis rod to return slowly. One end of the hysteresis rod passes through the piston and is close to the valve plate, pushing the valve plate to open the valve seat.

[0006] Preferably, both the hot-melt chamber and the ejection chamber are rectangular in shape, and the connection between the hot-melt chamber and the ejection chamber is stepped, which is used to connect the hot-melt chamber and the ejection chamber after the piston enters the hot-melt chamber.

[0007] Preferably, an electric heating jacket is fitted around the heating box and the nozzle to melt the solid material inside the heating box, and a funnel connected to the hot melting chamber is provided at the top of the heating box to input the solid material into the hot melting chamber.

[0008] Preferably, the inner cavity of the hydraulic cylinder is rectangular, the hydraulic rod is rectangular, the piston is rectangular, and the outer wall of the piston fits against the inner wall of the injection chamber to separate the hot melt chamber and the injection chamber.

[0009] Preferably, a mixing layer is sleeved inside the hot melt cavity, and a through hole is opened in the center of the mixing layer. The hydraulic rod passes through the through hole to prevent the mixing layer from hindering the movement of the hydraulic rod. The mixing layer has evenly distributed diversion holes for diverting large-volume materials into small-volume materials. A hot air cavity is opened inside the mixing layer for providing a heat source to the small-volume materials in the diversion holes.

[0010] Preferably, the top of the hot-melting cavity is provided with two symmetrical conveying pipes, and the conveying pipes are provided with evenly distributed connecting pipes. The connecting pipes are connected to the hot air cavity. One of the conveying pipes inputs hot air into the hot air cavity, and the other conveying pipe outputs hot air from the hot air cavity, so as to form a hot air flow state in the hot air cavity.

[0011] Preferably, a spring IV is provided between adjacent mixing layers, and a baffle plate is provided at the top of the hot melt cavity. The end of the spring IV away from the piston and away from the mixing layer is connected to the baffle plate to change the space between adjacent mixing layers.

[0012] Preferably, the top end of the hydraulic rod is provided with evenly distributed power protrusions, and the top end of the through hole is provided with evenly distributed receiving protrusions. The cross-sections of the power protrusions and the receiving protrusions are both semi-circular, which is used for the power protrusions to rub against the receiving protrusions and drive the mixing layer to rise. The power protrusions are grouped into groups of four, and the distance between two groups of power protrusions is four power protrusions, which is used for adjacent mixing layers to move up and down alternately.

[0013] Preferably, a spring III is fixedly connected to the top of the mixing layer to drive the raised mixing layer to move downward. The top of the spring III is not fixedly connected to the top of the hot melt cavity, so that the mixing layer can still move linearly when moving up and down.

[0014] Preferably, there is a gap between the top end of the mixing layer and the top end of the hot-melt cavity, and a gap between the bottom end of the mixing layer and the bottom end of the hot-melt cavity, to provide space for the mixing layer to bounce up and down and for the conveying pipe to move. The conveying pipe is a high-temperature resistant metal flexible tube, used to follow the mixing layer to move up and down and linearly.

[0015] This application has the following beneficial effects:

[0016] This application provides an injection molding equipment for high-strength polypropylene composite injection molded parts. When the piston pushes the material towards the nozzle, the hysteresis rod pushes the valve plate to open the valve seat. The reaction force of the valve plate on the hysteresis rod causes the hysteresis rod to move towards the piston, compressing and storing energy in spring I. This allows the material to be extruded from the nozzle through the valve seat. When the piston returns to its original position, the compressed spring I returns to its original position towards the valve plate, pushing the hysteresis rod to decelerate in the direction of the piston's movement. This causes the valve plate to decelerate and return to its original position under the resistance of the hysteresis rod. The molten material at the nozzle flows towards the valve seat under the suction of the piston, avoiding drooling. Simultaneously, as the hysteresis rod gradually moves away from the valve plate, the valve plate closes the valve seat, preventing the molten material at the nozzle from being affected by the piston's suction, thus reducing the amount of air drawn into the nozzle.

[0017] At the same time, through the reciprocating motion of the piston, the material in the hot melt chamber is drawn into multiple diversion holes on the mixing layer by the piston, so that the large volume of material is separated and the small volume of material in the diversion holes is directly heated by the heat source in the mixing layer, thereby improving the heating effect of the material.

[0018] At the same time, the reciprocating motion of the piston will cause the power protrusion on the hydraulic rod to rub against the receiving protrusion on the adjacent mixing layer intermittently. In conjunction with spring III, the adjacent mixing layers will bounce alternately, causing the material in the diversion holes of the adjacent mixing layers to stratify when it leaves the diversion holes. This will allow the stratified material to mix together under the suction motion of the piston, thereby improving the shearing and mixing effect of the material.

[0019] Simultaneously, as the piston moves towards the mixing layer, it presses against the mixing layer near the injection chamber, causing the piston to push the mixing layer in that direction. At the same time, through the transmission of springs IV between adjacent mixing layers, other mixing layers also move in the direction of the piston's movement. Taking one spring IV as an example, spring IV is first compressed. When the elastic force of the compressed spring IV exceeds the resistance provided by the next spring IV, it pushes the next mixing layer to compress the next spring IV, causing the next mixing layer to move to the next mixing layer. The next spring IV gradually compresses, while the spring IV in this case recovers a certain length. This process repeats, and due to the elastic force of spring IV, the space between adjacent mixing layers gradually decreases in the general direction. However, the shrinking space will increase when spring IV recovers a certain length. This causes the layered material between two adjacent mixing layers to be compressed and stretched during the process of the space increasing and decreasing, improving the mixing and heating effect of the material in this area.

[0020] Meanwhile, after the piston pushes the mixing layer near the ejection chamber to move, the hot melt chamber and the ejection chamber will be connected through the stepped section. Due to the closure of the valve seat and the movement of the piston, although there is material left in the space between the piston and the valve seat, a vacuum environment will still be formed. Under the pressure difference between the hot melt chamber and the ejection chamber and the push of the piston, the material in the ejection chamber will enter the space between the piston and the valve seat for the piston to extrude material in the next time. Attached Figure Description

[0021] The accompanying drawings, which form part of this specification, illustrate embodiments disclosed in this application and, together with the specification, serve to explain the principles disclosed in this application.

[0022] This application can be more clearly understood with reference to the accompanying drawings and the following detailed description, wherein:

[0023] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0024] Figure 2 This is a schematic diagram of the internal structure distribution of the hot melt cavity of the present invention;

[0025] Figure 3 This is a schematic diagram of the internal structure distribution of the ejection cavity of the present invention;

[0026] Figure 4 This is a schematic diagram of the internal structure of the heating box of the present invention;

[0027] Figure 5 This is a schematic diagram showing the position of the hysteresis rod structure of the present invention;

[0028] Figure 6 This is a schematic diagram showing the structural position of spring IV of the present invention;

[0029] Figure 7 This is a schematic diagram of the internal structure of the hybrid layer of the present invention.

[0030] Figure label:

[0031] 1. Heating box; 2. Hot melt chamber; 3. Pushing chamber; 4. Nozzle; 5. Funnel; 6. Heating mantle; 7. Hydraulic cylinder; 8. Hydraulic rod; 9. Power protrusion; 10. Piston; 11. Moving chamber; 12. Spring I; 13. Hysteresis rod; 14. Valve seat; 15. Positioning block; 16. Spring II; 17. Valve plate; 18. Mixing layer; 181. Spring III; 19. Through hole; 20. Receiving protrusion; 21. Diverting hole; 22. Hot gas chamber; 23. Conveying pipe; 24. Spring IV; 25. Barrier plate. Detailed Implementation

[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0033] Example 1

[0034] Please see Figures 1 to 4 An injection molding machine for high-strength polypropylene composite injection molded parts includes a heating chamber 1, which has a hot melt chamber 2 and an injection chamber 3. Both the hot melt chamber 2 and the injection chamber 3 are rectangular. The connection between the hot melt chamber 2 and the injection chamber 3 is stepped, so that the mixing layer 18 near the injection chamber 3 can be pressed against the stepped part. When the piston 10 pushes this mixing layer 18 away from the stepped part, after the piston 10 enters the hot melt chamber 2, the material in the hot melt chamber 2 can enter the injection chamber 3 through the connecting channel formed by the stepped part to replenish the material in the injection chamber 3. A nozzle 4 is fixedly connected to one end of the heating chamber 1. The nozzle 4 is connected to the injection chamber 3, so that the material in the injection chamber 3 can be squeezed through the nozzle 4 under the push of the piston 10. The material is fed into the mold. Heating sleeves 6 are fitted around the heating box 1 and nozzle 4 to provide heat to the heating box 1 and nozzle 4, melting the material in the hot melt chamber 2 and keeping the material in the injection chamber 3 and nozzle 4 in a molten state. A funnel 5 is fixedly connected to the top of the heating box 1 and is connected to the hot melt chamber 2. When the material in the hot melt chamber 2 decreases, the material can fall into the hot melt chamber 2 through the funnel 5. When the piston 10 moves to one side of the funnel 5 in the injection chamber 3, it will squeeze the material in the hot melt chamber 2, so that the molten material in the hot melt chamber 2 can be squeezed into the funnel 5, forming a mixture of solid and molten state in the funnel 5. This preheats the material in the funnel 5 and accelerates the melting time after the material enters the hot melt chamber 2.

[0035] participate Figures 1 to 5A hydraulic cylinder 7 is fixedly connected to one end of the heating box 1 near the funnel 5. A hydraulic rod 8 is sleeved inside the hydraulic cylinder 7. The inner cavity of the hydraulic cylinder 7 is rectangular, and the hydraulic rod 8 is also rectangular, so that the hydraulic rod 8 fits into the through hole 19. When the mixing layer 18 bounces up and down, the side wall of the hydraulic rod 8 can fit against the side wall of the through hole 19, so that the material only flows through the top and bottom of the hydraulic rod 8. This allows the hydraulic rod 8 to squeeze the flowing material, improving the mixing effect and shear heating effect of the material. A piston 10 is fixedly connected to one end of the hydraulic rod 8 near the nozzle 4. The piston 10 is rectangular, and... The piston 10 is movably fitted inside the ejection chamber 3. The outer wall of the piston 10 is in contact with the inner wall of the ejection chamber 3, so that when the piston 10 moves inside the ejection chamber 3, the hot melt chamber 2 and the ejection chamber 3 are not connected. When the piston 10 moves in the direction of the nozzle 4, it can push the material in the ejection chamber 3 to be squeezed out through the nozzle 4. When the piston 10 moves in the direction of the hot melt chamber 2, it can push the material in the hot melt chamber 2 into the funnel 5. When the piston 10 continues to move in the direction of the hot melt chamber 2 and leaves the ejection chamber 3, it will cooperate with the low-pressure environment formed in the ejection chamber 3 to push the material in the hot melt chamber 2 into the ejection chamber 3.

[0036] See Figures 2 to 5 A valve seat 14 is fixedly connected inside the injection chamber 3. The valve seat 14 is located between the piston 10 and the nozzle 4. The middle of the valve seat 14 is through, and two symmetrical positioning blocks 15 are fixedly connected to the middle of the valve seat 14, so that the positioning blocks 15 provide fixing points for the spring II 16. The end of the positioning block 15 away from the piston 10 is fixedly connected to the spring II 16, and the other end of the spring II 16 is fixedly connected to the valve plate 17. When the spring II 16 is in a stretched state, after the valve plate 17 loses external force, the spring II 16 can drive the valve plate 17 to close the through part of the valve seat 14. The valve plate 17 blocks the through part of the valve seat 14, so that the injection chamber 3 is divided into two parts by the valve seat 14 and the valve plate 17.

[0037] See Figure 5The piston 10 has a movable chamber 11. A spring I 12 is fixedly connected to one end of the movable chamber 11 near the hydraulic rod 8, and a hysteresis rod 13 is fixedly connected to the other end of the spring I 12. The hysteresis rod 13 has a T-shaped cross-section. One end of the hysteresis rod 13 passes through the piston 10 into the injection chamber 3, and this end is close to the valve plate 17. When the piston 10 pushes the material forward toward the nozzle 4, the hysteresis rod 13 pushes the valve plate 17 to open the valve seat 14. At this time, the spring II 16 is stretched, and the reaction force of the valve plate 17 on the hysteresis rod 13 causes the hysteresis rod 13 to move toward the piston 10, compressing and storing energy in the spring I 12, allowing the material to pass through the valve. When the piston 10 returns to its original position, the compressed spring I 12 will return to the direction of the valve plate 17, pushing the hysteresis rod 13 to decelerate in the direction of piston 10. This causes the valve plate 17 to decelerate and return to its original position under the resistance of the hysteresis rod 13. This allows the molten material at the nozzle 4 to flow towards the valve seat 14 under the suction of the piston 10, thus avoiding drooling. At the same time, as the hysteresis rod 13 gradually moves away from the valve plate 17, the valve plate 17 closes the valve seat 14, so that the molten material at the nozzle 4 is no longer affected by the suction of the piston 10, thereby reducing the amount of air drawn into the nozzle 4.

[0038] Example 2

[0039] Please see Figures 2 to 4 , Figures 6 to 7 Based on Embodiment 1, a uniformly distributed mixing layer 18 is movably fitted inside the hot-melt chamber 2. A through hole 19 is provided in the center of the mixing layer 18, through which a hydraulic rod 8 passes. This allows the mixing layer 18 to pass through the through hole 19 without obstructing the movement of the piston 10 driven by the hydraulic rod 8. Uniformly distributed diversion holes 21 are provided on the mixing layer 18, penetrating the mixing layer 18. This allows the piston 10 to drive the material flow within the hot-melt chamber 2 during reciprocating motion. Consequently, large volumes of material within the hot-melt chamber 2 are drawn into the multiple diversion holes 21 on the mixing layer 18 by the piston 10, thus separating the large volumes of material. The small volume material in the flow hole 21 is directly heated by the heat source in the mixing layer 18, thereby improving the heating effect of the material. A hot air chamber 22 is opened in the mixing layer 18, and the flow hole 21 passes through the hot air chamber 22. Two symmetrical conveying pipes 23 are fixedly connected to the top of the hot melting chamber 2. The conveying pipes 23 are provided with evenly distributed connecting pipes, which are connected to the hot air chamber 22. One of the conveying pipes 23 inputs hot air into the hot air chamber 22, and the other conveying pipe 23 outputs hot air from the hot air chamber 22, so that the material in the flow hole 21 can be directly heated by the hot air, thereby improving the heating effect of the small volume material in the flow hole 21.

[0040] See Figures 3 to 4 , Figure 6A spring IV 24 is fixedly connected between adjacent mixing layers 18. A baffle plate 25 is fixedly connected to the top of the hot melt cavity 2. The end of the spring IV 24 away from the piston 10 and away from the mixing layer 18 is fixedly connected to the baffle plate 25. When the piston 10 moves toward the mixing layer 18, the piston 10 will press against the mixing layer 18 near the injection cavity 3, causing the piston 10 to push the mixing layer 18 at this location to move in the same direction. At the same time, through the transmission of the spring IV 24 between adjacent mixing layers 18, other mixing layers 18 also move in the direction of movement of the piston 10. Taking one of the springs IV 24 as an example, the spring IV 24 is first compressed. When the elastic force of the compressed spring IV 24 is greater than the force of the spring IV 24, the spring IV 24 is compressed. After the resistance provided by the next spring IV 24, it will push the next mixing layer 18 to compress the next spring IV 24, causing the next mixing layer 18 to move to the next mixing layer 18. This causes the next spring IV 24 to gradually compress, while the spring IV 24 will recover a certain length. This process repeats, and under the influence of the elastic force of the spring IV 24, the space between adjacent mixing layers 18 gradually decreases in the general direction. However, the shrinking space will increase when the spring IV 24 recovers a certain length. As a result, the layered material between two adjacent mixing layers 18 is squeezed and stretched during the process of the space increasing and decreasing, thereby improving the mixing and heating effect of the material.

[0041] Example 3

[0042] Please see Figures 2 to 6 Based on Embodiment 2, the top end of the hydraulic rod 8 is fixedly connected with evenly distributed power protrusions 9, and the top end of the through hole 19 is fixedly connected with evenly distributed receiving protrusions 20. The cross-sections of the power protrusions 9 and the receiving protrusions 20 are both semi-circular. The power protrusions 9 are grouped into four groups, and the distance between the two groups of power protrusions 9 is four power protrusions 9 apart. The reciprocating motion of the piston 10 will cause the power protrusions 9 on the hydraulic rod 8 to rub against the receiving protrusions 20 on the adjacent mixing layer 18 intermittently. With the help of the spring Ⅲ181, the adjacent mixing layers 18 bounce alternately, so that the material in the diversion hole 21 of the adjacent mixing layer 18 will stratify when it leaves the diversion hole 21. Thus, the stratified material is mixed together under the suction motion of the piston 10, thereby improving the shearing and mixing effect of the material.

[0043] See Figure 4There is a gap between the top of the mixing layer 18 and the top of the hot melt cavity 2, and there is a gap between the bottom of the mixing layer 18 and the bottom of the hot melt cavity 2, so that the mixing layer 18 has enough space to bounce up and down. The delivery pipe 23 is a high-temperature resistant metal hose, so that when the mixing layer 18 is bouncing up and down and making linear movements in the direction of the hydraulic rod 8, the delivery pipe 23 can still be connected to the mixing layer 18, maintaining the airflow state in the hot air cavity 22. The top of the mixing layer 18 is fixedly connected to the spring Ⅲ181, and the top of the spring Ⅲ181 is not fixedly connected to the top of the hot melt cavity 2, so that the mixing layer 18 can still make linear movements in the direction of the hydraulic rod 8 while bouncing up and down.

Claims

1. An injection molding equipment for high-strength polypropylene composite material injection molded parts, characterized in that, It includes a heating box (1), which is provided with a hot melt chamber (2) and a push injection chamber (3). A nozzle (4) is provided at one end of the heating box (1) near the push injection chamber (3) for extruding material into the push injection chamber (3) into the mold. A hydraulic cylinder (7) is provided at one end of the heating box (1) near the funnel (5). A hydraulic rod (8) is sleeved inside the hydraulic cylinder (7). A piston (10) is provided at one end of the hydraulic rod (8) located in the injection chamber (3) to drive the material flow in the hot melt chamber (2) and the injection chamber (3). A valve seat (14) is provided inside the ejection chamber (3). The valve seat (14) is passed through the middle, and a valve plate (17) is provided at the passing part for sealing. The valve seat (14) is located between the piston (10) and the nozzle (4) to divide the ejection chamber (3) into two spaces. Two symmetrical positioning blocks (15) are provided in the middle of the valve seat (14). A spring II (16) is connected to one end of the positioning block (15) away from the piston (10). The other end of the spring II (16) is connected to the valve plate (17) to pull the valve plate (17) to block the valve seat (14). The piston (10) has a movable cavity (11) inside, and a spring I (12) and a hysteresis rod (13) are provided in the movable cavity (11) to provide space and elastic force for the hysteresis rod (13) to slowly return. One end of the hysteresis rod (13) passes through the piston (10) and is close to the valve plate (17) to push the valve plate (17) to open the valve seat (14). Both the hot melt cavity (2) and the ejection cavity (3) are rectangular in shape. The connection between the hot melt cavity (2) and the ejection cavity (3) is stepped, which is used to connect the hot melt cavity (2) and the ejection cavity (3) after the piston (10) enters the hot melt cavity (2). The inner cavity of the hydraulic cylinder (7) is rectangular, the hydraulic rod (8) is rectangular, the piston (10) is rectangular, and the outer wall of the piston (10) is attached to the inner wall of the injection cavity (3) to separate the hot melt cavity (2) and the injection cavity (3). A spring I (12) is fixedly connected to one end of the active cavity (11) near the hydraulic rod (8), and a hysteresis rod (13) is fixedly connected to the other end of the spring I (12). The cross section of the hysteresis rod (13) is T-shaped.

2. The injection molding equipment for high-strength polypropylene composite injection molded parts according to claim 1, characterized in that, The heating box (1) and the nozzle (4) are fitted with an electric heating jacket (6) for melting solid materials in the heating box (1). The top of the heating box (1) is provided with a funnel (5) connected to the hot melting chamber (2) for feeding solid materials into the hot melting chamber (2).

3. The injection molding equipment for high-strength polypropylene composite injection molded parts according to claim 1, characterized in that, The hot melt cavity (2) is fitted with a mixing layer (18), and a through hole (19) is provided in the center of the mixing layer (18). The hydraulic rod (8) passes through the through hole (19) to prevent the mixing layer (18) from hindering the movement of the hydraulic rod (8). The mixing layer (18) is provided with evenly distributed diversion holes (21) for diverting large volume materials into small volume materials. The mixing layer (18) is provided with a hot air cavity (22) for providing a heat source to the small volume materials in the diversion holes (21).

4. The injection molding equipment for high-strength polypropylene composite injection molded parts according to claim 3, characterized in that, The top of the hot melt cavity (2) is provided with two symmetrical conveying pipes (23). The conveying pipes (23) are provided with evenly distributed connecting pipes. The connecting pipes are connected to the hot gas cavity (22). One of the conveying pipes (23) inputs hot gas into the hot gas cavity (22), and the other conveying pipe (23) outputs hot gas from the hot gas cavity (22) to form a hot gas flow state in the hot gas cavity (22).

5. The injection molding equipment for high-strength polypropylene composite injection molded parts according to claim 4, characterized in that, A spring IV (24) is provided between adjacent mixing layers (18), and a baffle plate (25) is provided at the top of the hot melt cavity (2). The end of the spring IV (24) away from the piston (10) is connected to the baffle plate (25) to change the space size between adjacent mixing layers (18).

6. The injection molding equipment for high-strength polypropylene composite injection molded parts according to claim 5, characterized in that, The top of the hydraulic rod (8) is provided with evenly distributed power protrusions (9), and the top of the through hole (19) is provided with evenly distributed receiving protrusions (20). The cross-sections of the power protrusions (9) and the receiving protrusions (20) are both semi-circular, which are used for the power protrusions (9) to rub against the receiving protrusions (20) and drive the mixing layer (18) to rise. The power protrusions (9) are in groups of four, and the distance between the two groups of power protrusions (9) is four power protrusions (9), which are used for the adjacent mixing layers (18) to move up and down alternately.

7. The injection molding equipment for high-strength polypropylene composite injection molded parts according to claim 6, characterized in that, A spring III (181) is fixedly connected to the top of the mixing layer (18) to drive the raised mixing layer (18) to move down. The top of the spring III (181) is not fixedly connected to the top of the hot melt cavity (2) so that the mixing layer (18) can still move in a straight line when it moves up and down.

8. The injection molding equipment for high-strength polypropylene composite injection molded parts according to claim 7, characterized in that, There is a gap between the top of the mixing layer (18) and the top of the hot melt cavity (2), and there is a gap between the bottom of the mixing layer (18) and the bottom of the hot melt cavity (2), which provides space for the mixing layer (18) to bounce up and down and for the conveying pipe (23) to move. The conveying pipe (23) is a high-temperature resistant metal hose, which is used to follow the mixing layer (18) to move up and down and to move in a straight line.

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