A multi-station temperature-controlled injection molding machine

Abstract

The invention belongs to the field of injection molding, and specifically is a multi-station temperature-controlled injection molding machine. By arranging a shrinkage-feeding groove and a hydraulically controlled one-way valve on a fixed mold, the shrinkage-feeding groove and the hydraulically controlled one-way valve replace a screw to perform pressure-maintaining and shrinkage-feeding, so that after the mold is filled with raw materials, it is not necessary to continue to perform pressure-maintaining and shrinkage-feeding through the screw, and the screw does not need to wait until the raw materials in the molding cavity are completely condensed before filling the next mold, which greatly improves the working efficiency of the injection molding machine; by arranging an eccentric stirring roller, a fan blade, and an inclined shrinkage-feeding port, the fluidity of the liquid raw material in the molding cavity and the injection channel is improved, and the increased fluidity can prevent the finished product from being insufficiently filled, weld marks and bubbles, etc., thereby improving the quality of the finished product; by arranging a second heating layer, a third heating layer, and a heat insulation board, while ensuring that the raw materials in the shrinkage-feeding groove and the injection channel are not solidified, it can also prevent excess heat from being conducted to the molding cavity, which causes the molding raw materials to condense too slowly.

Description

Technical Field

[0001] The invention belongs to the field of injection molding, in particular to a multi-station temperature-controlled injection molding machine. Background Art

[0002] Injection molding machine is also known as injection molding machine or injection machine. Injection molding machine can heat plastic, apply high pressure to molten plastic, make it eject and fill the mold cavity. Many factories call it beer machine, and injection molded products are called beer parts. It is the main molding equipment that uses plastic molding molds to make plastic products of various shapes of thermoplastic plastics or thermosetting materials. Injection molding machine can be divided into vertical, horizontal and vertical-horizontal composite according to the arrangement of injection device and locking device. The working principle of injection molding machine is similar to that of syringe for injection. It uses the thrust of screw (or plunger) to inject plasticized molten state (i.e. viscous flow state) plastic into closed mold cavity, and obtains the product after solidification and shaping.

[0003] There is also a patent in the prior art about a multi-station temperature-controlled injection molding machine, such as a multi-station temperature-controlled injection molding machine with application number 201910192118.1, which includes a controller, a base, an injection nozzle, a fixing unit, a rotating platform, a motor, a molding mold and a temperature control unit; a telescopic rod is fixedly connected to the top of the column arranged on the rotating platform; the end of the telescopic rod is fixedly connected to the injection nozzle; the molding mold includes a fixed mold and a movable mold; a main flow channel for injection molding by the injection nozzle is opened on the fixed mold; a sealing valve is arranged at the entrance of the main flow channel; at least three groups of fixing units are arranged circumferentially on the rotating platform, and the rotation of the rotating platform is driven by a motor; the movable mold is arranged on the fixed unit; a reducing module is arranged on the fixed mold; the reducing module includes an arc-shaped spring piece, an electric push rod, an arc-shaped support plate and an auxiliary pushing unit; the present invention has a simple structure, is easy to operate, and the main flow channel is reduced in diameter through the reducing module, thereby avoiding blockage of the main flow channel and facilitating cleaning after blockage.

[0004] However, the above device has the following disadvantages: in the existing equipment, it is necessary to maintain the pressure and compensate for the shrinkage in the mold through the screw, so that the injection nozzle needs to wait for the current mold to condense before filling the next mold, resulting in low working efficiency of the injection molding machine and greatly increasing the production time. In the process of mass production, continuous injection molding cannot be achieved, the production efficiency is low, and it is not conducive to increasing output and reducing costs.

[0005] In view of this, the present invention solves the above technical problems by proposing a multi-station temperature-controlled injection molding machine. Summary of the invention

[0006] In order to make up for the shortcomings of the existing technology, the existing multi-station temperature-controlled injection molding machine needs to use a screw to maintain pressure and compensate for shrinkage in the mold, so that the injection nozzle needs to wait for the current mold to condense before filling the next mold, resulting in low working efficiency of the injection molding machine.

[0007] The technical solution adopted by the present invention to solve its technical problems is: a multi-station temperature-controlled injection molding machine, comprising an injection molding mechanism, a frame, a mold mounting mechanism, a fixed mold and a movable mold; the frame comprises a mounting frame, a base and a connecting frame, the mounting frame is fixedly connected to the top of the base through the connecting frame; the injection molding motor is mounted on the upper surface of the mounting frame, and the injection molding head is mounted on the lower surface of the mounting frame; the injection molding motor is connected to the screw in the injection molding head by a rotating shaft passing through the mounting frame, the hopper is mounted on the upper surface of the mounting frame, and is connected to the inside of the injection molding head through a feed pipe passing through the mounting frame, and a No. 1 heating layer is provided on the inner surface of the injection molding head; the mold mounting mechanism comprises a rotating plate, a mounting seat, a No. 1 telescopic rod and a fixed frame, the rotating plate is rotatably mounted on the upper surface of the base, a group of No. 1 telescopic rods are evenly arranged on the upper surface of the rotating plate around the central axis of the rotating plate, the end of the No. 1 telescopic rod is fixedly connected to the mounting seat, the top of the mounting seat is fixedly connected to the movable mold, and a cooling device is provided in the movable mold. , the movable mold cooperates with the upper fixed mold, the fixed mold is fixedly connected to the rotating plate through a fixed frame, the fixed mold is divided into a fixed part and a mounting part, the fixed part cooperates with the movable mold to form a molding cavity, an injection channel is provided in the fixed part, the injection channel vertically passes through the fixed mold, the upper opening of the injection channel corresponds to the position of the injection molding machine head, a hydraulically controlled one-way valve is provided at a position of the injection channel close to the upper surface of the fixed mold, the inner surface of the injection channel close to the movable mold is conical, and a second heating layer is provided on the outside of the injection channel; the mounting part is installed on one side of the injection channel in the fixed part, a cylindrical shrinkage feeding groove is provided in the mounting part, a third heating layer is provided on the outside of the shrinkage feeding groove, a push plate is provided in the shrinkage feeding groove, the push plate is sealingly and slidably connected to the inner surface of the shrinkage feeding groove, the push plate is connected to the rotating motor on the outside of the mounting part through a second telescopic rod, the shrinkage feeding groove is connected to the injection channel through a shrinkage feeding port arranged in the fixed part, and the shrinkage feeding port is located between the hydraulically controlled one-way valve and the lower surface of the fixed mold.

[0008] During operation, install all the mechanisms of the injection molding machine, rotate the rotating plate to align the injection molding head with the injection pipe of the fixed mold, turn on the injection molding motor, the screw in the injection molding head starts to rotate, and the No. 1 heating layer in the injection molding head is energized to heat the inside. At the same time, pour the injection molding raw material into the hopper. Under the action of the screw and the No. 1 heating layer, the raw material begins to melt and is pushed to fill the entire injection molding head. At this time, the fixed mold and the movable mold are in a coordinated state. When the raw material in the injection molding head melts and reaches the specified temperature, the screw rotates to apply pressure, and the raw material passes through the hydraulic one-way valve along the injection channel into the molding cavity, and part of it is poured into the hopper. The raw material enters the feeding groove through the feeding port. At this time, the extension amount of the No. 2 telescopic rod is the smallest. When the molding cavity is filled with raw materials, the pressure in the cavity increases. When the pressure in the molding cavity reaches the set value, the screw releases the pressure, and the rotating plate rotates to prepare for filling the next molding cavity. Because of the existence of the hydraulically controlled one-way valve, when the screw releases the pressure, the raw material in the mold is blocked in the mold by the hydraulically controlled one-way valve, and the pressure in the mold remains unchanged. Relying on the cooling device in the movable mold, the raw material in the molding cavity is gradually cooled, and the No. 2 telescopic rod pushes the push plate to press the raw material in the feeding groove into the molding cavity to ensure that the raw material is cooled and the volume shrinks. The pressure in the molding cavity remains unchanged for 2 hours, achieving the effect of shrinkage compensation and pressure maintenance. The No. 2 heating layer on the outside of the injection channel and the No. 3 heating layer on the outside of the shrinkage compensation groove heat the internal raw materials to prevent the raw materials in the injection channel and the shrinkage compensation groove from condensing and blocking the injection channel. The diameter of the injection channel on the side close to the movable mold gradually decreases and becomes a cone, which is convenient for separating the condensed plastic from the molten raw materials above. When the plastic inside the molding cavity is cooled and formed, the No. 2 telescopic rod drives the push plate to retract and restore the pressure to the normal level. The No. 1 telescopic rod moves downward to separate the fixed mold from the movable mold, take out the molded plastic, and the No. 1 telescopic rod is used to press the push plate to the mold. The shrink rod returns to its position again, waiting for the next filling work. The shrinkage feeding groove and the push plate replace the screw to maintain pressure and shrinkage, so that the screw does not have to wait until the raw material in the mold is cooled down before reducing the pressure to fill the next mold, which greatly shortens the injection time and improves the working efficiency of the injection molding machine; the fixed mold is divided into mounting parts and fixing parts. When necessary, the mounting parts can be removed to facilitate the installation, maintenance and replacement of the internal parts of the mounting parts, thereby increasing the service life of the mold; the No. 1 heating layer, the No. 2 heating layer and the No. 3 heating layer in this equipment are all heated by resistance wires, and the cooling device is a commonly used cooling device for molds in the prior art.

[0009] Preferably, a heat insulation layer is installed in the fixing member, and the heat insulation layer is placed horizontally and located between the fixing member and the molding cavity.

[0010] During operation, the heat insulation layer installed in the fixing part is located between the fixing part and the molding cavity, preventing the heat generated by the fixing part and the second and third heating layers from being transferred to the molding cavity, causing slow condensation of the plastic in the molding cavity, and affecting the efficiency and quality of the injection molding work. At the same time, the heat insulation layer also ensures that the heat dissipation of the molten raw material in the injection channel and the shrinkage feeding groove above the heat insulation layer is slowed down, preventing the raw material from condensing in the injection channel and the shrinkage feeding groove to block the pipeline and affect the work, and can also lock the heat of the second and third heating layers to improve thermal efficiency and thermal utilization.

[0011] Preferably, a stirring roller is eccentrically provided on one side of the push plate close to the injection pipe, the stirring roller is a cone, and the large end of the stirring roller is connected to the push plate.

[0012] During operation, the rotating motor drives the telescopic rod and the push plate to rotate. A stirring roller is eccentrically provided on one side of the push plate close to the injection pipe. The stirring roller is fixedly connected to the push plate. When the push plate rotates, the stirring roller moves eccentrically to stir the molten plastic inside, thereby increasing the fluidity of the plastic liquid. The enhanced fluidity of the raw materials can prevent insufficient filling, welding marks and bubbles in the finished product, and also enable the molten liquid to flow better from the feeding groove into the molding cavity. At the same time, the stirring roller is set to be conical, and the large end is connected to the push plate. When rotating, it will provide a force in the direction of the feeding port to the internal raw material, so that the molten raw material has a tendency to move out of the feeding groove when being stirred. When the molding cavity needs to be fed, the raw material in the feeding groove can be quickly fed, and the molding effect is improved; the maximum distance moved by the push plate will not cause the end of the stirring roller to collide with the inner wall of the feeding groove.

[0013] Preferably, a group of blades are evenly arranged on the outer surface of the stirring roller around the central axis of the stirring roller, and the blades adjacent to the push plate extend toward the rotating plate, and the ends of the extended parts are flush with the side walls of the push plate.

[0014] During operation, the rotating motor drives the telescopic rod and the push plate to rotate, and drives the stirring roller to rotate eccentrically. The fan blades arranged on the stirring roller can increase the stirring effect. The fan blades close to the push plate extend toward the rotating plate, and the end of the extended part is flush with the side wall of the push plate to prevent the raw materials close to the surface of the push plate from being not stirred. As a result, part of the raw materials remain in the gap between the fan blades and the push plate in the shrinkage feeding groove, and are not replaced or supplemented with raw materials from the outside. As a result, this part of the raw materials are in a molten state but are not used. After a long time, the quality of the material will decline, and it will be mixed into the finished product, affecting the quality of the finished product.

[0015] Preferably, the side of the fan blade close to the push plate is a vertical plane, and the side away from the push plate is a curved surface.

[0016] When working, the vertical plane of the fan blade is close to the push plate. When rotating, it will not exert force on the raw material in the direction of the push plate, and the liquid raw material will not be squeezed onto the surface of the push plate. The side of the fan blade away from the push plate is a curved surface. When rotating, it has a strong effect on the liquid raw material in the direction of the injection channel, further improving the shrinkage compensation speed and ensuring the quality of the finished product.

[0017] Preferably, the end of the feeding port close to the injection channel is inclined downward.

[0018] During operation, the raw material pressed out of the feeding groove by the push plate enters the injection channel along the feeding port. The end of the feeding port close to the injection channel is inclined downward, with a tendency to move downward, and drives the raw material in the injection channel, accelerating the raw material to enter the molding cavity for feeding, reducing the pressure loss during the feeding process, ensuring that most of the pressure is transmitted to the molding cavity, and ensuring the quality of the finished product.

[0019] The beneficial effects of the present invention are as follows:

[0020] 1. The multi-station temperature-controlled injection molding machine described in the present invention provides a feeding groove and a hydraulically controlled one-way valve on the fixed mold. The feeding groove and the hydraulically controlled one-way valve replace the screw for pressure-maintaining and shrinkage-compensation. After the mold is filled with raw materials, there is no need to continue to use the screw for pressure-maintaining and shrinkage-compensation. The screw does not need to wait until the raw materials in the molding cavity are condensed before filling the next mold, which greatly improves the working efficiency of the injection molding machine. At the same time, the fixed mold is divided into an installation part and a fixing part, which is convenient for replacing and repairing the parts in the feeding groove, thereby improving the service life of the fixed mold.

[0021] 2. The multi-station temperature-controlled injection molding machine described in the present invention improves the fluidity of the liquid raw material in the molding cavity and the injection channel by arranging an eccentric stirring roller, fan blades, and an inclined shrinkage feeding port. Increasing the fluidity can prevent the finished product from being insufficiently filled, having weld marks and bubbles, and improve the quality of the finished product. By arranging a second heating layer, a third heating layer, and a heat insulation board, while ensuring that the raw material in the shrinkage feeding groove and the injection channel does not solidify, it can also prevent excess heat from being conducted to the molding cavity, causing the molding raw material to condense too slowly. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below in conjunction with the accompanying drawings.

[0023] Figure 1 is a stereogram of the present invention;

[0024] Figure 2 is a front cross-sectional view of the present invention;

[0025] Figure 3 yes Figure 2 A partial enlarged view of the middle A;

[0026] Figure 4 yes Figure 3A partial enlarged view of point B in the middle;

[0027] In the figure: injection molding mechanism 1, injection molding head 11, hopper 12, injection molding motor 13, rotating shaft 14, feed pipe 15, screw 16, No. 1 heating layer 17, frame 2, mounting frame 21, base 22, connecting frame 23, mold mounting mechanism 3, rotating plate 31, mounting seat 32, No. 1 telescopic rod 33, fixed frame 34, fixed mold 4, fixing part 41, mounting part 42, injection molding channel 43, hydraulically controlled one-way valve 44, No. 2 heating layer 45, shrinkage compensation groove 46, push plate 461, No. 2 telescopic rod 462, rotating motor 463, shrinkage compensation port 464, stirring roller 465, fan blade 466, No. 3 heating layer 47, thermal insulation layer 48, movable mold 5, cooling device 51, molding cavity 6. DETAILED DESCRIPTION

[0028] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0029] like Figures 1 to 4As shown, a multi-station temperature-controlled injection molding machine according to the present invention comprises an injection molding mechanism 1, a frame 2, a mold mounting mechanism 3, a fixed mold 4 and a movable mold 5; the frame 2 comprises a mounting frame 21, a base 22 and a connecting frame 23, the mounting frame 21 is fixedly connected to the top of the base 22 through the connecting frame 23; the injection molding motor 13 is mounted on the upper surface of the mounting frame 21, and the injection molding head 11 is mounted on the lower surface of the mounting frame 21; the injection molding motor 13 is connected to the screw 16 in the injection molding head 11 by means of a rotating shaft 14 passing through the mounting frame 21, the hopper 12 is mounted on the upper surface of the mounting frame 21, and the hopper 12 is connected to the upper surface of the mounting frame 21. The feeding pipe 15 passing through the mounting frame 21 is connected to the inside of the injection molding machine head 11, and a No. 1 heating layer 17 is provided on the inner surface of the injection molding machine head 11; the mold mounting mechanism 3 includes a rotating plate 31, a mounting seat 32, a No. 1 telescopic rod 33 and a fixed frame 34, the rotating plate 31 is rotatably mounted on the upper surface of the base 22, and a group of No. 1 telescopic rods 33 are evenly arranged on the upper surface of the rotating plate 31 around the central axis of the rotating plate 31, the end of the No. 1 telescopic rod 33 is fixedly connected to the mounting seat 32, and the top of the mounting seat 32 is fixedly connected to the movable mold 5, and a cooling device 51 is provided in the movable mold 5, and the movable mold 5 is connected to the upper fixed mold 4, the fixed mold 4 is fixedly connected to the rotating plate 31 through a fixing frame 34, the fixed mold 4 is divided into a fixing part 41 and a mounting part 42, the fixing part 41 cooperates with the movable mold 5 to form a molding cavity 6, an injection channel 43 is arranged in the fixing part 41, the injection channel 43 vertically passes through the fixed mold 4, the upper opening of the injection channel 43 corresponds to the position of the injection molding machine head 11, a hydraulically controlled one-way valve 44 is arranged near the upper surface of the fixed mold 4, the inner surface of the injection channel 43 near the movable mold 5 is conical, and a second heating layer 45 is arranged on the outer side of the injection channel 43; the mounting part 42 is installed on one side of the injection channel 43 in the fixing part 41, and a cylindrical shrinkage-feeding groove 46 is provided in the fixing part 42, and a third heating layer 47 is provided on the outer side of the shrinkage-feeding groove 46, and a push plate 461 is provided in the shrinkage-feeding groove 46, and the push plate 461 is sealed and slidably connected with the inner surface of the shrinkage-feeding groove 46, and the push plate 461 is connected to the rotating motor 463 on the outer side of the fixing part 42 through a second telescopic rod 462, and the shrinkage-feeding groove 46 is connected to the injection channel 43 through a shrinkage-feeding port 464 provided in the fixing part 41, and the shrinkage-feeding port 464 is located between the hydraulically controlled one-way valve 44 and the lower surface of the fixed mold 4.

[0030] During operation, the various mechanisms of the injection molding machine are installed, the rotating plate 31 is rotated to align the injection molding head 11 with the injection molding pipe of the fixed mold 4, the injection molding motor 13 is turned on, the screw 16 in the injection molding head 11 starts to rotate, and the No. 1 heating layer 17 in the injection molding head 11 is energized to heat the interior, and the injection molding raw material is poured into the hopper 12 at the same time. Under the action of the screw 16 and the No. 1 heating layer 17, the raw material begins to melt and is pushed to fill the entire injection molding head 11. At this time, the fixed mold 4 and the movable mold 5 are in a matching state. When the raw material in the injection molding head 11 melts and reaches the specified temperature, the screw 16 rotates to apply pressure, and the raw material passes through the hydraulic one-way valve 44 along the injection channel 43 and enters the molding cavity 6. Part of the raw material enters the feeding groove 46 through the feeding port 464. At this time, the second telescopic rod 462 has the smallest extension amount. When the molding cavity 6 is filled with raw materials, the pressure in the cavity increases. When the pressure in the molding cavity 6 reaches the set value, the screw 16 releases the pressure, and the rotating plate 31 rotates to prepare for filling the next molding cavity 6. Because of the existence of the hydraulically controlled one-way valve 44, when the screw 16 releases the pressure, the raw material in the mold is blocked in the mold by the hydraulically controlled one-way valve 44, and the pressure in the mold remains unchanged. Relying on the cooling device 51 in the movable mold 5, the raw material in the molding cavity 6 is gradually cooled, and the second telescopic rod 462 pushes the push plate 461, so that the raw material in the feeding groove 46 is pressed into the molding cavity 6, ensuring that the raw material When the cooling volume is reduced, the pressure in the molding cavity 6 remains unchanged, achieving the effect of shrinkage compensation and pressure maintenance. The second heating layer 45 arranged on the outside of the injection channel 43 and the third heating layer 47 arranged on the outside of the shrinkage compensation groove 46 heat the internal raw materials to prevent the raw materials in the injection channel 43 and the shrinkage compensation groove 46 from condensing and blocking the injection channel 43. The diameter of the injection channel 43 on one side close to the movable mold 5 gradually decreases to form a cone shape, which is convenient for separating the condensed plastic from the molten raw materials above. When the plastic inside the molding cavity 6 is cooled and formed, the second telescopic rod 462 drives the push plate 461 to retract, and the pressure is restored to a normal level. The first telescopic rod 33 moves downward to separate the fixed mold 4 from the movable mold 5, and the formed plastic is taken out. The No. 1 telescopic rod 33 returns to its position again, waiting for the next charging work. The pressure-maintaining and shrinkage-compensating groove 46 and the push plate 461 replace the screw 16, so that the screw 16 does not have to wait until the raw material in the mold is completely cooled before reducing the pressure to fill the next mold, which greatly shortens the injection time and improves the working efficiency of the injection molding machine; the fixed mold 4 is divided into a mounting part 42 and a fixing part 41. When necessary, the mounting part 42 can be removed to facilitate the installation, maintenance and replacement of the internal parts of the mounting part 42, thereby increasing the service life of the mold. The No. 1 heating layer 17, the No. 2 heating layer 45 and the No. 3 heating layer 47 in the equipment are all heated by resistance wires, and the cooling device 51 is a commonly used cooling device for molds in the prior art.

[0031] As an embodiment of the present invention, a heat insulating layer 48 is installed in the fixing member 41 . The heat insulating layer 48 is placed horizontally and is located between the mounting member 42 and the molding cavity 6 .

[0032] During operation, the heat insulation layer 48 installed in the fixing part 41 is located between the mounting part 42 and the molding cavity 6, preventing the heat of the mounting part 42 and the second heating layer 45 and the third heating layer 47 from being transferred to the molding cavity 6 during heating, resulting in slow condensation of the plastic in the molding cavity 6, affecting the efficiency and quality of the injection molding work. At the same time, the heat insulation layer 48 also ensures that the heat dissipation of the molten raw material in the injection channel 43 and the shrinkage feeding groove 46 above the heat insulation layer 48 is slowed down, preventing the raw material from condensing in the injection channel 43 and the shrinkage feeding groove 46 to block the pipeline and affect the work, and can also lock the heat of the second heating layer 45 and the third heating layer 47 to improve thermal efficiency and thermal utilization.

[0033] As an embodiment of the present invention, a stirring roller 465 is eccentrically provided on one side of the push plate 461 close to the injection pipe. The stirring roller 465 is a cone, and the large end of the stirring roller 465 is connected to the push plate 461 .

[0034] When working, the rotating motor 463 drives the telescopic rod and the push plate 461 to rotate. A stirring roller 465 is eccentrically provided on one side of the push plate 461 close to the injection molding pipe. The stirring roller 465 is fixedly connected to the push plate 461. When the push plate 461 rotates, the stirring roller 465 makes an eccentric movement to stir the internal molten plastic, thereby increasing the fluidity of the plastic liquid. The enhanced fluidity of the raw material can prevent the finished product from being insufficiently filled, having welding marks and bubbles, and at the same time, it also enables the molten liquid to flow better from the feeding groove 46 into the molding cavity 6. At the same time, the stirring roller 465 is set to be conical, and the large end is connected to the push plate 461. When rotating, it will provide a force to the internal raw material in the direction of the feeding port 464, so that the molten raw material has a tendency to move out of the feeding groove 46 when being stirred. When the molding cavity 6 needs to be fed, the raw material in the feeding groove 46 can be quickly fed, and the molding effect is improved; the maximum distance moved by the push plate 461 will not cause the end of the stirring roller 465 to collide with the inner wall of the feeding groove 46.

[0035] As an embodiment of the present invention, a group of fan blades 466 are evenly arranged on the outer surface of the stirring roller 465 around the central axis of the stirring roller 465, and the fan blades 466 adjacent to the push plate 461 extend toward the rotating plate 31, and the end of the extended part is flush with the side wall of the push plate 461.

[0036] During operation, the rotating motor 463 drives the telescopic rod and the push plate 461 to rotate, and drives the stirring roller 465 to rotate eccentrically. The fan blades 466 arranged on the stirring roller 465 can increase the stirring effect. The fan blades 466 close to the push plate 461 extend toward the rotating plate 31, and the end of the extended part is flush with the side wall of the push plate 461 to prevent the raw materials close to the surface of the push plate 461 from not being stirred, causing part of the raw materials to remain in the gap between the fan blades and the push plate in the shrinkage feeding groove 46, without being replaced and supplemented with external raw materials, causing this part of the raw materials to be in a molten state but not being used. After a long time, the quality of the material will decline, and it will be mixed into the finished product and affect the quality of the finished product.

[0037] As an implementation manner of the present invention, the side of the fan blade 466 close to the push plate 461 is a vertical plane, and the side away from the push plate 461 is a curved surface.

[0038] When working, the vertical plane of the fan blade 466 is close to the push plate 461. When rotating, it will not exert force on the raw material in the direction of the push plate 461, and the liquid raw material will not be squeezed onto the surface of the push plate 461. The side of the fan blade 466 away from the push plate 461 is a curved surface. When rotating, it has a strong effect on the liquid raw material in the direction of the injection channel 43, further improving the shrinkage compensation speed and ensuring the quality of the finished product.

[0039] As an embodiment of the present invention, the end of the feeding port 464 close to the injection channel 43 is inclined downward.

[0040] During operation, the raw material pressed out of the feeding groove 46 by the push plate 461 enters the injection channel 43 along the feeding port 464. The end of the feeding port 464 close to the injection channel 43 is inclined downward, with a tendency to move downward, and drives the raw material in the injection channel 43, accelerating the raw material to enter the molding cavity 6 for feeding, reducing the pressure loss during the feeding process, ensuring that most of the pressure is transmitted to the molding cavity 6, and ensuring the quality of the finished product.

[0041] The specific workflow is as follows:

[0042] During operation, the mechanism of the injection molding machine is installed, the rotating plate 31 is rotated to align the injection molding head 11 with the injection molding pipe of the fixed mold 4, the injection molding motor 13 is turned on, the screw 16 in the injection molding head 11 starts to rotate, and the No. 1 heating layer 17 in the injection molding head 11 is energized to heat the interior. At the same time, the injection molding raw material is poured into the hopper 12. Under the action of the screw 16 and the heating layer, the raw material begins to melt and is pushed to fill the entire injection molding head 11. At this time, the fixed mold 4 and the movable mold 5 are in a matching state. When the raw material in the injection molding head 11 When the material melts and reaches the specified temperature, the screw 16 rotates and applies pressure, and the raw material passes through the hydraulically controlled one-way valve 44 along the injection pipe and enters the molding cavity 6. Part of the raw material enters the shrinkage feeding groove 46 through the shrinkage feeding port 464. At this time, the second telescopic rod 462 has the smallest expansion amount. When the molding cavity 6 is filled with raw materials, the pressure in the cavity increases. When the pressure in the molding cavity 6 reaches the set value, the screw 16 releases the pressure, and the rotating plate 31 rotates to prepare for filling the next mold. Because of the existence of the hydraulically controlled one-way valve 44, when the screw 16 releases the pressure, the mold The raw material is blocked in the mold by the hydraulic one-way valve 44, and the pressure in the mold remains unchanged. Relying on the cooling device 51 in the movable mold 5, the raw material in the molding cavity 6 is gradually cooled. The second telescopic rod 462 pushes the push plate 461, so that the raw material in the shrinkage feeding groove 46 is pressed into the molding cavity 6, ensuring that the pressure in the molding cavity 6 remains unchanged when the raw material is cooled and the volume is reduced. The second heating layer 45 arranged on the outside of the injection channel 43 and the third heating layer 47 on the outside of the shrinkage feeding groove 46 heat the internal raw material. The injection channel 43 is close to the movable mold 5. The diameter of one side gradually decreases to form a cone shape, which is convenient for separating the condensed plastic from the molten raw material above. When the plastic is condensed, the second telescopic rod 462 drives the push plate 461 to retract, and the pressure is restored to a normal level. The first telescopic rod 33 moves downward to separate the fixed mold 4 from the movable mold 5, and the molded plastic is taken out. The telescopic rod returns to its original position again, waiting for the next filling work; the fixed mold 4 is divided into a mounting part 42 and a fixing part 41. When necessary, the mounting part 42 can be removed to facilitate the installation, maintenance and replacement of the internal parts of the mounting part 42.

[0043] The above-mentioned front, back, left, right, top and bottom are all based on the figures in the specification. Figure 1 As a benchmark, according to the person's observation perspective, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0044] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the scope of protection of the present invention.

[0045] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A multi-station temperature-controlled injection molding machine, characterized in that: The invention comprises an injection molding mechanism (1), a frame (2), a mold mounting mechanism (3), a fixed mold (4) and a movable mold (5); the frame (2) comprises a mounting frame (21), a base (22) and a connecting frame (23); the mounting frame (21) is fixedly connected to the top of the base (22) through the connecting frame (23); an injection molding motor (13) is mounted on the upper surface of the mounting frame (21); an injection molding machine head (11) is mounted on the lower surface of the mounting frame (21); the injection molding motor (13) is connected to a screw (16) in the injection molding machine head (11) by means of a rotating shaft (14) penetrating the mounting frame (21); a hopper (12) is mounted on the upper surface of the mounting frame (21); the hopper (12) is connected to the injection molding machine head (11) by means of a rotating shaft (14) penetrating the mounting frame (21); 1) is connected to the inside of the injection molding machine head (11), and the inner surface of the injection molding machine head (11) is provided with a first heating layer (17); the mold mounting mechanism (3) comprises a rotating plate (31), a mounting seat (32), a first telescopic rod (33) and a fixing frame (34), the rotating plate (31) is rotatably mounted on the upper surface of the base (22), a group of first telescopic rods (33) are evenly arranged on the upper surface of the rotating plate (31) around the central axis of the rotating plate (31), the end of the first telescopic rod (33) is fixedly connected to the mounting seat (32), the top of the mounting seat (32) is fixedly connected to a movable mold (5), the movable mold (5) is provided with a cooling device (51), and the movable mold (5) cooperates with the upper fixed mold (4) The fixed mold (4) is fixedly connected to the rotating plate (31) through a fixing frame (34), the fixed mold (4) is divided into a fixing part (41) and a mounting part (42), the fixing part (41) cooperates with the movable mold (5) to form a molding cavity (6), an injection channel (43) is provided in the fixing part (41), the injection channel (43) vertically passes through the fixed mold (4), the upper opening of the injection channel (43) corresponds to the position of the injection molding machine head (11), a hydraulically controlled one-way valve (44) is provided at a position close to the upper surface of the fixed mold (4), the inner surface of the injection channel (43) close to the movable mold (5) is conical, and a second heating layer (45) is provided on the outer side of the injection channel (43); the mounting part (4 2) is installed on one side of the injection channel (43) in the fixing member (41), the fixing member (42) is provided with a cylindrical shrinkage-compensating groove (46), the outer side of the shrinkage-compensating groove (46) is provided with a third heating layer (47), the shrinkage-compensating groove (46) is provided with a push plate (461), the push plate (461) is sealingly and slidably connected to the inner surface of the shrinkage-compensating groove (46), the push plate (461) is connected to the rotating motor (463) on the outer side of the fixing member (42) through a second telescopic rod (462), the shrinkage-compensating groove (46) is connected to the injection channel (43) through a shrinkage-compensating port (464) provided in the fixing member (41), and the shrinkage-compensating port (464) is located between the hydraulically controlled one-way valve (44) and the lower surface of the fixed mold (4).

2. A multi-station temperature-controlled injection molding machine according to claim 1, characterized in that: A heat insulation layer (48) is installed in the fixing member (41); the heat insulation layer (48) is placed horizontally and is located between the mounting member (42) and the molding cavity (6).

3. A multi-station temperature-controlled injection molding machine according to claim 2, characterized in that: A stirring roller (465) is eccentrically provided on one side of the push plate (461) close to the injection molding pipe. The stirring roller (465) is a cone, and the large end of the stirring roller (465) is connected to the push plate (461).

4. A multi-station temperature-controlled injection molding machine according to claim 3, characterized in that: A group of fan blades (466) are evenly arranged on the outer surface of the stirring roller (465) around the central axis of the stirring roller (465), and the fan blades (466) adjacent to the push plate (461) extend toward the rotating plate (31), and the ends of the extended parts are flush with the side walls of the push plate (461).

5. A multi-station temperature-controlled injection molding machine according to claim 4, characterized in that: The side of the fan blade (466) close to the push plate (461) is a vertical plane, and the side away from the push plate (461) is a curved surface.

6. A multi-station temperature-controlled injection molding machine according to claim 5, characterized in that: The end of the shrinkage feeding port (464) close to the injection channel (43) is inclined downward.

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