Plastic product processing injection mold with quantity control conveying structure

Abstract

The invention relates to the technical field of injection molds, in particular to a plastic product processing injection mold with a quantity control conveying structure, which comprises a base, a fixed mold and a movable mold are arranged at the top of the base, a material conveying assembly is arranged at the top of the base, the material conveying assembly comprises a conveying pipe, and a material melting tank is arranged above the conveying pipe; the material conveying assembly is combined with the material melting tank and the air suction assembly, during injection molding, the adjustable quantity-controlled conveying effect is achieved, meanwhile, air in the injection molding cavity is extracted synchronously, and the injection efficiency of molten plastic is accelerated in an auxiliary mode; during material pumping, a negative pressure environment is formed in the conveying pipe, molten plastic is automatically and rapidly pumped, the problem that the injection molding quality of plastic products is low due to the fact that outside air and water vapor cooperate with the molten plastic to be injected into an injection molding cavity is solved, meanwhile, the pumped air is used for accelerating the cooling efficiency after injection molding in the discharging process, and the injection molding quality and efficiency are improved.

Description

Technical Field

[0001] The invention relates to the technical field of injection molds, in particular to a plastic product processing injection mold with a controlled quantity conveying structure. Background Art

[0002] During the injection molding process, molten plastic is injected into the mold injection cavity from the inlet. When the air at the end of the injection cavity cannot be discharged, the so-called "dead air" or "trapped air" will be formed. When the molten plastic continues to be injected, the air is compressed under the action of pressure. When the air is continuously compressed, the temperature is constantly rising, and the pressure will continue to increase, which may eventually cause the plastic to burn. No matter how much injection pressure is applied, the air cannot be completely removed, forcing the molten plastic to be unable to flow to the end of the injection cavity, making it difficult to ensure the dimensional accuracy of the product. Therefore, the exhaust structure in the mold plays a vital role.

[0003] For example, in the prior art, a home appliance housing injection molding mold with publication number CN117532805A is provided. Although the injection molding mold can realize the exhaust of gas in the injection cavity by means of an exhaust mechanism, when the top of the injection cavity has a plurality of uneven groove structures, the exhaust is only discharged by extrusion when the molten plastic is injected. Once the molten plastic blocks the communicating area of ​​the plurality of grooves, Fig.10 The top structure of the injection molding cavity shown in the figure cannot ensure the complete discharge of the "trapped air" inside, and cannot achieve high-quality injection molding processing;

[0004] In view of the above technical defects, a solution is now proposed. Summary of the invention

[0005] The purpose of the present invention is to provide a plastic product processing injection mold with a controlled quantity conveying structure. The material conveying component is combined with a melt tank and an air suction component. During the injection molding process, an adjustable controlled quantity conveying effect is achieved, and the air in the injection molding cavity is simultaneously extracted to assist in accelerating the injection efficiency of the molten plastic; and during the extraction process, a negative pressure environment is formed inside the conveying pipe, the feed pipe is automatically opened and the molten plastic is quickly extracted to avoid the problem of poor injection quality of plastic products caused by the injection of external air and water vapor into the injection molding cavity together with the molten plastic. At the same time, the extracted air is used to take away part of the heat on the active mold during the discharge process to accelerate the cooling efficiency after injection molding, thereby improving the overall injection molding quality and efficiency, and solving the above-mentioned technical defects.

[0006] The object of the present invention can be achieved by the following technical scheme: a plastic product processing injection mold with a controlled delivery structure comprises a base, a fixed mold and a movable mold are arranged on the top of the base, and an injection cavity is formed between the fixed mold and the movable mold;

[0007] A control panel is installed on the top bolt of the base, a material conveying assembly is arranged on the top of the base, the material conveying assembly includes a conveying pipe, a plunger rod is slidably connected inside the conveying pipe, and an arc-shaped material baffle plate is installed on the plunger rod, a push block is installed on one side of the plunger rod, and a screw rod threadedly connected to the push block is rotatably connected on the conveying pipe;

[0008] A melt tank is arranged above the conveying pipe, and a feed pipe is fixedly connected between the melt tank and the conveying pipe. A suction component matched with the plunger rod is arranged on the movable mold, and the suction component includes a suction hole opened at the top of the injection cavity, a suction cavity is opened on the top of the suction hole, and a blocking column matched with the suction hole is arranged inside the suction cavity.

[0009] Preferably, a plurality of electric push rods distributed in a rectangular array are fixedly connected between the movable mold and the base, the fixed mold is fixedly connected to the base through a bracket, a serpentine cavity is opened inside the movable mold, and both ends of the serpentine cavity pass through to the outside of the movable mold.

[0010] Preferably, the delivery pipe is fixedly connected to the base through bracket 2, an injection pipe is fixedly connected between one side of the delivery pipe and the fixed mold, and an injection one-way valve is fixedly provided on the injection pipe, and an insulation sleeve is fixedly installed on the outer wall of the delivery pipe.

[0011] Preferably, a heating sleeve is fixedly mounted on the outer wall of the melting tank, a rotating motor is bolted to the top of the melting tank, and an output shaft of the rotating motor passes through the interior of the melting tank and is fixedly connected to a stirring frame.

[0012] Preferably, a piston cavity is provided on one side of the plunger rod close to the push block, the free end of the screw rod is rotatably connected to a piston block slidably connected to the piston cavity, and a servo motor for driving the screw rod to rotate is bolted to the delivery pipe.

[0013] Preferably, the plunger rod is provided with an active cavity connected to the piston cavity, and the active cavity is slidably connected with an active tube that movably penetrates the pushing block, the active tube is fixedly connected with a limit plate, and the conveying tube is provided with an arc-shaped give way groove that is slidably connected to the limit plate.

[0014] Preferably, an exhaust one-way valve communicating with the serpentine cavity is installed on the movable mold, a connecting air pipe is fixedly connected between the exhaust one-way valve and the movable tube, and an intake pipe is fixedly connected between the connecting air pipe and the intake cavity.

[0015] Preferably, the top bolt of the movable mold is installed with an electric push rod 2, and the piston rod of the electric push rod 2 movably penetrates the air suction cavity and is fixedly connected to the blocking column.

[0016] Preferably, one side of the pushing block is rotatably connected to three groups of screws distributed in a circular array, and the screws are threadedly connected to the plunger rod, a sprocket is fixedly connected to the screw, and the sprockets are connected by a chain transmission, and one end of the screw located at the arc-shaped give way groove passes through the pushing block and is fixedly connected to a knob.

[0017] Preferably, linear limit grooves are symmetrically opened on the inner walls on both sides of the conveying tube, and an arc-shaped limit groove is opened on one side of the linear limit groove, a limit block slidably connected to the linear limit groove is fixedly connected to the push block, and an installation groove slidably connected to the arc-shaped material baffle plate is opened on the annular outer wall of the plunger rod, and a spring is fixedly connected between the installation groove and the arc-shaped material baffle plate.

[0018] The beneficial effects of the present invention are as follows:

[0019] (1) The present invention fully melts the plastic particles through a melting tank, and then drives the push block to carry the plunger rod to move in the conveying pipe with the help of a screw rod, and the injection one-way valve on the injection pipe first causes a negative pressure environment to be formed inside the conveying pipe, and combines with an arc-shaped baffle plate to stabilize the pressure inside the conveying pipe, and then drives the plunger rod to carry the arc-shaped baffle plate to rotate, automatically opens the feed pipe and quickly extracts the molten plastic in the melting tank, and effectively avoids the problem of low injection quality of plastic products caused by the injection of external air and water vapor generated by heating undried raw materials into the injection cavity during injection molding;

[0020] (2) The present invention also uses the deflection of the plunger rod before the linear movement to prompt the arc-shaped baffle plate to block the feed pipe, thereby preventing the molten plastic in the conveying pipe from partially flowing back to the melt tank during injection, so as to achieve the effect of controlled delivery; and then the distance between the push block and the plunger rod is adjusted by the screw rod, so as to adjust the size of the conveying space in the conveying pipe according to the size of the injection cavity, so as to achieve the purpose of adjustable controlled delivery of injection;

[0021] Then, the moving distance of the plunger rod is set as the initial injection displacement and the pressurized injection displacement through the controller in the control panel, so that after the plunger rod completes the movement of the initial injection displacement, the injection cavity can be completely filled with molten plastic, and after the suction component is driven to close, the plunger rod is moved for the secondary pressurized injection displacement, and the remaining small part of the molten plastic is pressurized and injected into the injection cavity, thereby improving the quality of the injection-molded plastic products;

[0022] (3) In the present invention, during the injection process by means of the movement of the plunger rod, a negative pressure environment is formed inside the piston cavity, and the air in the injection cavity can be extracted synchronously, thereby achieving efficient exhaust and helping to accelerate the injection efficiency of the molten plastic; then, during the extraction process by means of the movement of the plunger rod, the air extracted from the piston cavity is injected into the serpentine cavity in the movable mold and then discharged, which can drive part of the heat in the movable mold, accelerate the cooling efficiency of the injection-molded plastic product, and thus improve the overall injection molding quality and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below in conjunction with the accompanying drawings;

[0024] Figure 1 It is a schematic diagram of the structure of the present invention;

[0025] Figure 2 It is a schematic diagram of the internal structure of the delivery pipe of the present invention;

[0026] Figure 3 It is a schematic diagram of the structure of the delivery pipe of the present invention;

[0027] Figure 4 It is a schematic structural diagram of the plunger rod of the present invention;

[0028] Figure 5 It is a schematic diagram of the connection between the plunger rod and the push block of the present invention;

[0029] Figure 6 It is a structural schematic diagram of the push block of the present invention;

[0030] Figure 7 It is a schematic structural diagram of the air intake assembly of the present invention;

[0031] Figure 8 It is a structural schematic diagram of the movable mold of the present invention;

[0032] Fig. 9 It is a structural schematic diagram of the movable tube of the present invention;

[0033] Fig.10 It is a schematic diagram of injection molding where the existing molten plastic is located in the mold.

[0034] Legend:

[0035] 1. Base; 11. Fixed mold; 12. Movable mold; 13. Control panel; 14. Electric push rod 1; 15. Serpentine cavity; 16. Injection pipe; 17. Injection check valve;

[0036] 2. Feeding assembly; 21. Delivery pipe; 22. Plunger rod; 23. Arc-shaped baffle plate; 24. Pushing block; 25. Screw rod; 26. Insulation sleeve; 27. Piston chamber; 28. Piston block; 29. ​​Servo motor; 210. Active chamber; 211. Arc-shaped clearance groove; 212. Screw rod; 213. Linear limit groove; 214. Arc-shaped limit groove; 215. Limit block; 216. Mounting groove; 217. Spring;

[0037] 3. Melting tank; 31. Feeding pipe; 32. Heating jacket; 33. Rotating motor; 34. Stirring frame;

[0038] 4. Suction assembly; 41. Suction hole; 42. Suction cavity; 43. Blocking column; 44. Movable pipe; 45. Limit plate; 46. Exhaust one-way valve; 47. Connecting air pipe; 48. Suction pipe; 49. Electric push rod 2. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments 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.

[0040] Example 1: Please refer to Figure 1-Figure 6 As shown, in the injection molding process, the same pipe is used to melt and transport plastic particles, so that external air will enter the pipe during the injection of raw materials, and when the undried raw materials are heated, water vapor will be generated, which will then help the molten plastic to be injected into the injection cavity, reducing the injection molding quality of plastic products. The following solution can be used to solve the problem;

[0041] The plastic product processing injection mold with a controlled delivery structure in this embodiment includes a base 1, a fixed mold 11 and a movable mold 12 are arranged on the top of the base 1, and an injection cavity is formed between the fixed mold 11 and the movable mold 12, a control panel 13 is bolted on the top of the base 1, and a feeding assembly 2 is arranged on the top of the base 1 for conveying molten plastic to the injection cavity, and the feeding assembly 2 includes a delivery pipe 21, a plunger rod 22 is slidably connected inside the delivery pipe 21, and an arc-shaped material baffle plate 23 is installed on the plunger rod 22;

[0042] The arc-shaped baffle plate 23 is slidably connected to the inner wall of the delivery tube 21, and the arc-shaped baffle plate 23 and the plunger rod 22 can be combined into a complete cylindrical structure. There is a small sliding gap between the arc-shaped baffle plate 23, the plunger rod 22 and the inner wall of the delivery tube 21, and the molten plastic cannot enter the gap, so that the molten plastic can be completely discharged;

[0043] And when the plunger rod 22 does not block the feed pipe 31, the plunger rod 22 carries the arc-shaped baffle plate 23 to rotate, and the arc-shaped baffle plate 23 with a changed position can block the feed pipe 31, so that the plastic particles can be fully melted in the melt tank 3, and the feed pipe 31 is blocked during the injection and conveying process, and the molten plastic in the conveying pipe 21 is prevented from partially flowing back to the melt tank 3 when the material is injected, so as to achieve the effect of controlled delivery. A push block 24 is installed on one side of the plunger rod 22, and a screw rod 25 threadedly connected to the push block 24 is rotatably connected to the conveying pipe 21;

[0044] A melt tank 3 is arranged above the delivery pipe 21 to provide a separate carrier for melting plastic particles, and a feed pipe 31 is fixedly connected between the melt tank 3 and the delivery pipe 21. An air suction component 4 matched with the plunger rod 22 is arranged on the movable mold 12. The air suction component 4 includes an air suction hole 41 opened at the top of the injection cavity, and an air suction cavity 42 is opened at the top of the air suction hole 41.

[0045] The gas in the injection cavity can be discharged through the suction hole 41 and the suction cavity 42, and the interior of the suction cavity 42 is provided with a blocking column 43 adapted to the suction hole 41. The size of the suction cavity 42 is larger than that of the suction hole 41. When the injection cavity is completely filled with molten plastic, the blocking column 43 slides into the interior of the suction hole 41 to seal the suction hole 41, so as to prevent the molten plastic from being discharged through the suction hole 41.

[0046] A plurality of electric push rods 14 distributed in a rectangular array are fixedly connected between the movable mold 12 and the base 1. The base 1 is an L-shaped structure. One end of the electric push rod 14 is installed on the vertical side wall of the base 1 to achieve the horizontal movement effect of the movable mold 12, so as to facilitate the removal of the plastic product after injection molding. The fixed mold 11 is fixedly connected to the base 1 through a bracket 1. A serpentine cavity 15 is opened inside the movable mold 12, and both ends of the serpentine cavity 15 pass through the outside of the movable mold 12. Through the set serpentine cavity 15, when there is airflow inside the cavity, it can take away part of the heat on the movable mold 12, thereby accelerating the cooling efficiency after injection molding.

[0047] The delivery pipe 21 is fixedly connected to the base 1 through the bracket 2, and an injection pipe 16 is fixedly connected between one side of the delivery pipe 21 and the fixed mold 11, and an injection check valve 17 is fixedly provided on the injection pipe 16. The injection check valve 17 provided on the injection pipe 16 prevents the plunger rod 22 from withdrawing the molten plastic in the injection cavity through the injection pipe 16 during the resetting movement. An insulation sleeve 26 is fixedly installed on the outer wall of the delivery pipe 21, which can insulate the molten plastic entering the next stage in the delivery pipe 21, thereby preventing the fluidity of the molten plastic in the delivery pipe 21 from being reduced, thereby making it difficult to achieve a high-quality injection molding effect.

[0048] A heating sleeve 32 is fixedly installed on the outer wall of the melting tank 3, and an electric heating wire is arranged inside the heating sleeve 32. The melting tank 3 is heated by the electric heating wire, so as to achieve the melting effect of the plastic particles. A rotating motor 33 is installed on the top bolt of the melting tank 3, and the output shaft of the rotating motor 33 penetrates into the melting tank 3 and is fixedly connected with a stirring frame 34. The stirring frame 34 is slidably connected to the inner wall of the melting tank 3, so that the stirring frame 34 can synchronously scrape the plastic on the inner wall of the melting tank 3 during the rotation process, so as to avoid the problem of overheating and burning of local plastic.

[0049] The plastic particles are placed inside the melting tank 3, and the electric heating wire in the heating sleeve 32 is controlled to be energized and heated to heat the plastic particles to melt them into a molten state. During this process, the water vapor generated when the undried raw materials are heated will be directly discharged. While heating, the rotating motor 33 is started to drive the stirring frame 34 to rotate inside the melting tank 3, so that the plastic particles are evenly heated and melted. During the melting process, the arc-shaped baffle plate 23 blocks the feed pipe 31 to prevent the incompletely melted plastic from entering the conveying pipe 21.

[0050] The top bolt of the movable mold 12 is installed with an electric push rod 49, and the piston rod of the electric push rod 49 movably penetrates the suction chamber 42 and is fixedly connected to the blocking column 43. The moving distance of the plunger rod 22 is set as the initial injection displacement and the pressurized injection displacement through the controller in the control panel 13. After the plunger rod 22 completes the movement of the initial injection displacement, most of the molten plastic in the delivery pipe 21 is injected into the injection cavity and completely fills it. The controller in the control panel 13 controls the electric push rod 49 to drive the blocking column 43 to move, seal the suction hole 41, and at the same time, the plunger rod 22 is moved for the secondary pressurized injection displacement, and the remaining small part of the molten plastic is pressurized and injected into the injection cavity, thereby improving the quality of the injection molded plastic products.

[0051] One side of the push block 24 is rotatably connected with three groups of screw rods 212 distributed in a circular array, and the screw rods 212 are threadedly connected to the plunger rod 22, a sprocket is fixedly connected to the screw rod 212, and the sprockets are connected by a chain transmission. One end of the screw rod 212 located at the arc-shaped clearance groove 211 penetrates the push block 24 and is fixedly connected to a knob;

[0052] By turning the knob to drive the corresponding screw rod 212 to rotate, the other screw rods 212 rotate synchronously with the cooperation of the sprocket and the chain, so as to adjust the distance between the push block 24 and the plunger rod 22. The size of the conveying space in the conveying pipe 21 can be adjusted according to the size of the injection cavity, so as to achieve the purpose of adjustable controlled delivery of injection material.

[0053] Linear limiting grooves 213 are symmetrically provided on the inner walls of both sides of the delivery pipe 21, and an arc-shaped limiting groove 214 is provided on one side of the linear limiting groove 213. The linear limiting groove 213 and the arc-shaped limiting groove 214 are combined into an L-shaped structure, and a limiting block 215 slidably connected to the linear limiting groove 213 is fixedly connected to the push block 24;

[0054] After the plastic particles are fully melted into a molten state, they are quantitatively injected into the conveying pipe 21 through the feeding pipe 31, and the electric push rod 14 is controlled to push the movable mold 12 to move and engage with the fixed mold 11, and the screw rod 25 is controlled to rotate. The limit block 215 slides in the linear limit groove 213 to prevent the push block 24 from rotating with the rotation of the screw rod 25, so that the rotating screw rod 25 moves in the conveying pipe 21 away from the fixed mold 11 through the push block 24 and the plunger rod 22;

[0055] Combined with the injection check valve 17 on the injection pipe 16, a negative pressure environment is formed in the conveying space in the conveying pipe 21, until the limit block 215 moves into the arc limit groove 214, the rotation of the push block 24 will not be restricted, and the screw rod 25 drives the push block 24 and the plunger rod 22 to rotate, so that the arc baffle plate 23 no longer blocks the feed pipe 31. With the help of the negative pressure environment formed in the conveying space, the molten plastic in the melting tank 3 is quickly extracted, and the plastic particles are fully melted independently outside by the melting tank 3. With the negative pressure extraction of the conveying pipe 21, it can effectively avoid the problem of low quality of plastic products caused by the injection of external air and water vapor generated by the heating of undried raw materials into the injection molding cavity during injection molding;

[0056] After the extraction is completed, the rotating screw rod 25 moves inside the conveying pipe 21 close to the fixed mold 11 through the pushing block 24 and the plunger rod 22. During this process, the cooperation between the limit block 215 and the arc-shaped limit groove 214 causes the push column to carry the plunger rod 22 to rotate 90 degrees first, and causes the arc-shaped baffle plate 23 to rotate to the bottom of the feed pipe 31 for blocking, so as to prevent the molten plastic in the conveying pipe 21 from flowing back to the melt tank 3 when injecting the material, and then the conveying and injection process is carried out;

[0057] A mounting groove 216 is provided on the annular outer wall of the plunger rod 22, which is slidably connected to the arc-shaped baffle plate 23. The side of the mounting groove 216 close to the push block 24 is communicated with the inside of the delivery pipe 21, and is used to communicate with the outside world in combination with the arc-shaped give-way groove 211 on the delivery pipe 21. A spring 217 is fixedly connected between the mounting groove 216 and the arc-shaped baffle plate 23. When a negative pressure environment is formed inside the delivery pipe 21, when the negative pressure value increases to a certain range, the arc-shaped baffle plate 23 will be pushed to stretch the spring 217 to move under the action of the external atmospheric pressure, so as to stabilize the negative pressure value in the delivery space.

[0058] To avoid excessive negative pressure, the molten plastic in the melting tank 3 is forced to enter the gap between the conveying pipe 21 and the arc-shaped baffle plate 23 or the plunger rod 22. In the process of drawing materials after the arc-shaped baffle plate 23 is separated from the feeding pipe 31, the arc-shaped baffle plate 23 is reset under the stretching action of the spring 217 to complete the quantitative drawing and thus achieve the purpose of controlled quantity delivery. In the process of conveying and filling, when the arc-shaped baffle plate 23 collides with one side of the conveying pipe 21, the spring 217 is compressed synchronously to ensure the smooth discharge of the molten plastic in the conveying pipe 21.

[0059] Example 2: Please refer to Figure 3-Figure 9 As shown, in the prior art, it is difficult to efficiently discharge the air in the injection molding cavity, which leads to the problem of low production quality of plastic products. This problem can be solved by the following solution;

[0060] In this embodiment, a piston cavity 27 is provided on one side of the plunger rod 22 near the push block 24, which is used to provide a space for the screw rod 25 to make way when the plunger rod 22 moves away from the fixed mold 11. The free end of the screw rod 25 is rotatably connected to a piston block 28 that is slidably connected to the piston cavity 27. The piston block 28 provided at the free end of the screw rod 25 is used to increase the stability of the screw rod 25 during rotation, and when the plunger rod 22 moves close to the fixed mold 11, a negative pressure environment is formed inside the piston cavity 27 to provide traction for the suction of the injection cavity. A servo motor 29 for driving the screw rod 25 to rotate is bolted to the delivery pipe 21.

[0061] An active cavity 210 connected to the piston cavity 27 is provided inside the plunger rod 22, and an active tube 44 that movably penetrates the push block 24 is slidably connected inside the active cavity 210. A sealing ring that slides with the active cavity 210 is provided on the outer side of one end of the active tube 44 to increase the sliding sealing between the active tube 44 and the active cavity 210. A limiting plate 45 is fixedly connected to the active tube 44, and an arc-shaped clearance groove 211 that is slidably connected to the limiting plate 45 is provided on the delivery tube 21. The limiting plate 45 and the arc-shaped clearance groove 211 are provided to prevent the linear motion of the plunger rod 22 from driving the movement of the active tube 44, and do not interfere with the rotation of the plunger rod 22. At the same time, the arc-shaped clearance groove 211 is provided to facilitate the rotation of the operating knob to achieve the regulation of the molten plastic delivery amount.

[0062] An exhaust check valve 46 connected to the serpentine cavity 15 is installed on the movable mold 12 to prevent the exhaust of gas inside the injection cavity from being performed through the serpentine cavity 15 when a negative pressure environment is formed inside the piston cavity 27. A connecting air pipe 47 is fixedly connected between the exhaust check valve 46 and the movable pipe 44, and an air suction pipe 48 is fixedly connected between the connecting air pipe 47 and the air suction cavity 42.

[0063] As the plunger rod 22 moves to inject material, combined with the fixed position of the piston block 28, the space of the piston chamber 27 is continuously enlarged, and with the cooperation of the exhaust check valve 46, the air in the injection cavity is synchronously extracted through the movable cavity 210, the movable pipe 44, the connecting air pipe 47, the suction pipe 48, the suction cavity 42 and the suction hole 41 in sequence, so as to achieve efficient exhaust of gas and help accelerate the injection efficiency of the molten plastic;

[0064] With the help of the linear return movement of the plunger rod 22 and the fixed position of the piston block 28, the space in the piston cavity 27 is continuously reduced, and the air extracted in the piston cavity 27 is injected into the serpentine cavity 15 in the movable mold 12 through the movable cavity 210, the movable tube 44, the connecting air pipe 47 and the exhaust one-way valve 46 in sequence, and then discharged, thereby driving part of the heat in the movable mold 12, accelerating the cooling efficiency of the injection molded plastic product, and thereby improving the overall injection quality and efficiency.

[0065] Example 3: Please refer to Figure 1-Figure 9 As shown, the present invention also provides a method for using a plastic product processing injection mold with a controlled delivery structure, comprising the following steps:

[0066] Step 1: Place plastic particles in the melting tank 3, control the electric heating wire in the heating sleeve 32 to be energized and heated, heat the plastic particles to melt into a molten state, and while heating, start the rotating motor 33 to drive the stirring frame 34 to rotate in the melting tank 3, so that the plastic particles are evenly heated and melted, avoiding excessive heating of the plastic on the inner wall of the melting tank 3;

[0067] Step 2: After the plastic particles are fully melted into a molten state, they are quantitatively injected into the conveying pipe 21 through the feed pipe 31, and the electric push rod 14 is controlled to push the movable mold 12 to move and engage with the fixed mold 11. The servo motor 29 is controlled to drive the screw rod 25 to rotate, and the rotating screw rod 25 moves inside the conveying pipe 21 through the push block 24 and the plunger rod 22. In this process, through the cooperation of the limit block 215 and the arc-shaped limit groove 214, the push column carrying the plunger rod 22 is first rotated 90°, and the arc-shaped baffle plate 23 is rotated to the bottom of the feed pipe 31 for blocking, so as to prevent the molten plastic in the conveying pipe 21 from flowing back to the melt tank 3 when injecting. This process can be used simultaneously for blocking the feed pipe 31 when the plastic particles are melted;

[0068] When the limit block 215 slides into the linear limit groove 213, the push block 24 will not be able to continue to rotate with the rotation of the screw rod 25, so as to limit the linear motion of the push block 24, and carry the plunger rod 22 to push the molten plastic inside the delivery tube 21, and inject it into the injection cavity formed between the fixed mold 11 and the movable mold 12 through the injection pipe 16;

[0069] Step 3: With the movement of the plunger rod 22, the material is injected. Combined with the fixed position of the piston block 28, the space of the piston chamber 27 is continuously increased. With the cooperation of the exhaust check valve 46, the air in the injection cavity is extracted synchronously through the movable cavity 210, the movable tube 44, the connecting air pipe 47, the suction pipe 48, the suction cavity 42 and the suction hole 41 in sequence, and the injection efficiency of the molten plastic is accelerated. When the arc-shaped baffle plate 23 contacts one side of the delivery pipe 21, the spring 217 is compressed synchronously to ensure the smooth discharge of the molten plastic in the delivery pipe 21.

[0070] When the screw rod 25 drives the plunger rod 22 to completely discharge the molten plastic, that is, when the moving range of the plunger rod 22 is reached as set by the controller in the control panel 13, the injection cavity is completely filled with molten plastic. The controller in the control panel 13 controls the electric push rod 49 to drive the blocking column 43 to move, and the suction hole 41 is blocked. The continuous movement of the plunger rod 22 pressurizes the remaining small part of the molten plastic into the injection cavity, thereby improving the quality of the injection-molded plastic product.

[0071] Step 4: After the pressure injection molding is completed, the servo motor 29 is controlled to drive the screw 25 to rotate in the opposite direction, and the push block 24 is combined to drive the plunger rod 22 to reset linearly, and the injection check valve 17 on the injection pipe 16 is combined to form a negative pressure environment in the conveying space of the conveying pipe 21. When the negative pressure value increases to a certain range, the arc-shaped baffle plate 23 will be pushed to stretch the spring 217 under the action of the external atmospheric pressure to stabilize the negative pressure value in the conveying space;

[0072] In the process of entering the arc-shaped limit groove 214 from the linear limit groove 213 through the limit block 215, the plunger rod 22 carries the arc-shaped material baffle plate 23 to reset and rotate, automatically opens the feed pipe 31, and uses the negative pressure environment formed by the conveying space to quickly extract the molten plastic in the melt tank 3. At the same time of extracting the material, the arc-shaped material baffle plate 23 resets and moves under the stretching action of the spring 217 to complete the quantitative extraction.

[0073] Step 5: With the help of the linear return movement of the plunger rod 22 and the fixed position of the piston block 28, the space in the piston cavity 27 is continuously reduced, and the air extracted from the piston cavity 27 is injected into the serpentine cavity 15 in the movable mold 12 through the movable cavity 210, the movable pipe 44, the connecting air pipe 47 and the exhaust check valve 46 in sequence, and then discharged, thereby driving part of the heat in the movable mold 12, accelerating the cooling efficiency of the injection molded plastic product, and thus improving the overall injection quality and efficiency;

[0074] Step six: By turning the knob, the corresponding screw rod 212 is driven to rotate, and the other screw rods 212 rotate synchronously with the cooperation of the sprocket and the chain, so as to adjust the distance between the push block 24 and the plunger rod 22. The size of the conveying space in the conveying pipe 21 can be adjusted according to the size of the injection cavity, so as to achieve the purpose of adjustable controlled delivery of injection material.

[0075] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A plastic product processing injection mold with a controlled delivery structure, comprising a base (1), a fixed mold (11) and a movable mold (12) are arranged on the top of the base (1), and an injection cavity is formed between the fixed mold (11) and the movable mold (12), characterized in that: A control panel (13) is bolted to the top of the base (1); a material conveying assembly (2) is arranged on the top of the base (1); the material conveying assembly (2) comprises a conveying pipe (21); a plunger rod (22) is slidably connected to the inside of the conveying pipe (21); an arc-shaped material baffle plate (23) is installed on the plunger rod (22); a push block (24) is installed on one side of the plunger rod (22); and a screw rod (25) threadedly connected to the push block (24) is rotatably connected to the conveying pipe (21); A melt tank (3) is arranged above the delivery pipe (21), and a feed pipe (31) is fixedly connected between the melt tank (3) and the delivery pipe (21). An air suction component (4) matched with the plunger rod (22) is arranged on the movable mold (12), and the air suction component (4) includes an air suction hole (41) opened at the top of the injection cavity, an air suction cavity (42) is opened at the top of the air suction hole (41), and a material blocking column (43) matched with the air suction hole (41) is arranged inside the air suction cavity (42).

2. The plastic product processing injection mold with a controlled delivery structure according to claim 1, characterized in that: A plurality of electric push rods (14) distributed in a rectangular array are fixedly connected between the movable mold (12) and the base (1); the fixed mold (11) is fixedly connected to the base (1) via a bracket; a serpentine cavity (15) is provided inside the movable mold (12), and both ends of the serpentine cavity (15) extend through the outside of the movable mold (12).

3. The plastic product processing injection mold with a controlled delivery structure according to claim 1, characterized in that: The delivery pipe (21) is fixedly connected to the base (1) via a second bracket; an injection pipe (16) is fixedly connected between one side of the delivery pipe (21) and the fixed mold (11); an injection check valve (17) is fixedly provided on the injection pipe (16); and a heat preservation sleeve (26) is fixedly installed on the outer wall of the delivery pipe (21).

4. The plastic product processing injection mold with a controlled delivery structure according to claim 1, characterized in that: A heating sleeve (32) is fixedly mounted on the outer wall of the melting pot (3), a rotating motor (33) is bolted to the top of the melting pot (3), and an output shaft of the rotating motor (33) passes through the inside of the melting pot (3) and is fixedly connected to a stirring frame (34).

5. The plastic product processing injection mold with a controlled delivery structure according to claim 1, characterized in that: A piston cavity (27) is provided on one side of the plunger rod (22) close to the push block (24); a free end of the screw rod (25) is rotatably connected to a piston block (28) slidably connected to the piston cavity (27); and a servo motor (29) for driving the screw rod (25) to rotate is bolted to the delivery pipe (21).

6. The plastic product processing injection mold with a controlled delivery structure according to claim 2, characterized in that: The plunger rod (22) is provided with an active cavity (210) in communication with the piston cavity (27), and the active cavity (210) is slidably connected with an active tube (44) that movably penetrates the push block (24), the active tube (44) is fixedly connected with a limit plate (45), and the delivery tube (21) is provided with an arc-shaped clearance groove (211) that is slidably connected with the limit plate (45).

7. The plastic product processing injection mold with a controlled delivery structure according to claim 6, characterized in that: An exhaust check valve (46) communicating with the serpentine cavity (15) is installed on the movable mold (12); a connecting air pipe (47) is fixedly connected between the exhaust check valve (46) and the movable tube (44); and an intake pipe (48) is fixedly connected between the connecting air pipe (47) and the intake cavity (42).

8. The plastic product processing injection mold with a controlled delivery structure according to claim 1, characterized in that: The top bolt of the movable mold (12) is equipped with an electric push rod 2 (49), and the piston rod of the electric push rod 2 (49) movably penetrates the air suction cavity (42) and is fixedly connected to the material blocking column (43).

9. The plastic product processing injection mold with a controlled delivery structure according to claim 6, characterized in that: One side of the push block (24) is rotatably connected to three groups of screw rods (212) distributed in a ring array, and the screw rods (212) are threadedly connected to the plunger rod (22). A sprocket is fixedly connected to the screw rod (212), and the sprockets are connected via a chain transmission. One end of the screw rod (212) located at the arc-shaped clearance groove (211) passes through the push block (24) and is fixedly connected to a knob.

10. The plastic product processing injection mold with a controlled delivery structure according to claim 1, characterized in that: The inner walls of both sides of the conveying tube (21) are symmetrically provided with linear limit grooves (213), and one side of the linear limit groove (213) is provided with an arc-shaped limit groove (214), the push block (24) is fixedly connected with a limit block (215) slidably connected to the linear limit groove (213), the annular outer wall of the plunger rod (22) is provided with a mounting groove (216) slidably connected to the arc-shaped baffle plate (23), and a spring (217) is fixedly connected between the mounting groove (216) and the arc-shaped baffle plate (23).

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