Injection molding machine and method for plastic valve well

Abstract

The invention relates to the technical field of injection molding machines, and provides an injection molding machine and method for a plastic valve well. The injection molding machine for the plastic valve well comprises an injection molding machine body, a fixed mold and a movable mold are further installed at the working position of the injection molding machine body, and the fixed mold is matched with the movable mold; the mold further comprises a female mold, a male mold and temperature control assemblies, the female mold is installed on the fixed mold, the male mold is installed on the movable mold, a forming cavity is formed when the male mold and the female mold are assembled, a cooling cavity is formed in the female mold, and the temperature control assemblies are installed on the male mold and the female mold. The technical problems that in the prior art, due to the fact that a plastic valve well is large in size and complex in structure, molten plastic is prone to being cooled too fast in the injection molding process, solidification is caused before complete filling, and the defects of short injection, shrinkage cavities, surface defects and the like occur to finished products are solved.

Description

Technical Field

[0001] Embodiments of the present disclosure relate to the technical field of injection molding machines, and more specifically, to an injection molding machine and method for plastic valve wells. Background Art

[0002] A plastic valve well is a well-shaped structure used to protect underground valves and related pipeline equipment. It is usually made of plastics such as high-density polyethylene or polypropylene through injection molding. Its main function is to prevent underground valves from being damaged by soil, water pressure, or external impacts. Since plastic valve wells are usually large in volume and complex in structure, special large injection molding machines are required to produce plastic valve wells.

[0003] During the injection molding process, due to the large volume and complex structure of the plastic valve well, that is, the molten plastic needs to flow through a long path to fill the entire cavity. If the plastic cools too quickly during the flow process, it will solidify prematurely, resulting in incomplete filling, such as short shots, shrinkage holes, or surface defects. This situation is relatively common in large injection molded parts.

[0004] To solve the problem of incomplete filling, during operation, generally, the injection speed and injection pressure are adjusted so that the filling time exceeds the material solidification time and overcomes the long-flow path resistance. However, when implementing this method, higher-specification injection molding equipment is required, thereby increasing production costs. And during high-speed injection, if the shear rate is too high, it will cause the local temperature of the molten plastic to rise rapidly, resulting in defects such as black spots in the local area of the finished product. Summary of the Invention

[0005] To overcome the above defects, embodiments of the present disclosure provide an injection molding machine and method for plastic valve wells, which solve the technical problem in the prior art that due to the large volume and complex structure of plastic valve wells, the molten plastic is prone to cool too quickly during the injection molding process, resulting in solidification before complete filling, and thus deficiencies such as short shots, shrinkage holes, and surface defects in the finished product.

[0006] The technical solution of the present disclosure is as follows: An injection molding machine for a plastic valve well includes an injection molding machine body. A fixed mold and a movable mold are also installed at the working position of the injection molding machine body. The fixed mold is adapted to the movable mold, and further includes: A female mold, which is installed on the fixed mold; A male mold, which is installed on the movable mold and is configured to be able to form a molding cavity with the female mold; Wherein, a cooling cavity is arranged inside the female mold; Heating and heat-conducting frames and cooling and heat-preserving frames. Inside the male mold, a number of heating and heat-conducting frames and a number of cooling and heat-preserving frames are fixedly installed at equal angles in a circumferential shape. The number of the heating and heat-conducting frames and the number of the cooling and heat-preserving frames are arranged alternately. Each of the heating and heat-conducting frames and each of the cooling and heat-preserving frames has a hollow structure inside. A tooth-shaped structure is provided and adapted between every two adjacent heating and heat-conducting frames and cooling and heat-preserving frames. Temperature control components. The temperature control components are installed on both the male mold and the female mold and are used to control the temperature in the forming cavity when processing plastic valve wells.

[0007] On the basis of the foregoing solution, the temperature control component includes: A heat supply part, which is installed on the moving mold and is used to provide heat for the injection molding process. A cooling part, which is installed on both the moving mold and the female mold and is used to cool the finished plastic valve well.

[0008] On the basis of the foregoing solution, there is a transition area for temperature transfer between every two adjacent cooling and heat-preserving frames and heating and heat-conducting frames.

[0009] On the basis of the foregoing solution, the heat supply part includes: A heat supply groove, which is opened inside the moving mold and is set in a C shape. A heat supply pipe, and one end of each heating and heat-conducting frame away from the female mold is communicated with the heat supply pipe, and each heat supply pipe is communicated with the heat supply groove. Among them, in the working state of the heating and heat-conducting frame, the temperature of the end close to the female mold is lower than the temperature of the end far from the female mold. An annular collecting groove, which is opened inside the moving mold and is arranged inside the heat supply groove. A return pipe, and one end of each heating and heat-conducting frame close to the female mold is communicated with the return pipe, and each return pipe is communicated with the annular collecting groove.

[0010] On the basis of the foregoing solution, the cooling part includes: A cooling groove, which is opened inside the moving mold and is set in a C shape. A liquid return pipe, and one end of each cooling and heat-preserving frame away from the female mold is communicated with the liquid return pipe, and each liquid return pipe is communicated with the cooling groove. Among them, in the working state of the cooling and heat-preserving frame, the temperature of the end close to the female mold is lower than the temperature of the end far from the female mold.

[0011] On the basis of the foregoing solution, it further includes: A collection cylinder, which is fixedly installed inside the moving mold, and the collection cylinder is located inside the cooling tank; A liquid supply pipe, and a liquid supply pipe is communicated between each end of the cooling and heat conduction frame close to the female mold and the collection cylinder; A cooling member, which is installed inside the female mold and is used for cooling the finished product.

[0012] On the basis of the foregoing solution, the cooling member includes a female mold liquid inlet pipe and a female mold liquid discharge pipe. The female mold liquid inlet pipe and the female mold liquid discharge pipe are both fixedly installed on the fixed mold. The female mold liquid inlet pipe is communicated with the top of the cooling chamber, and the female mold liquid discharge pipe is communicated with the bottom of the cooling chamber.

[0013] On the basis of the foregoing solution, it further includes a liquid supply assembly, which is installed on the injection molding machine body and is used for providing liquid for the temperature control assembly. It further includes: A liquid storage tank, which is fixedly installed on the side of the injection molding machine body; A first water pump, which is fixedly installed on the liquid storage tank; A heater, the output end of the heater is communicated with the input end of the first water pump. The heater is fixedly installed on the liquid storage tank, and the input end of the heater is communicated with the liquid storage tank; A heat supply delivery pipe, which is communicated with the output end of the first water pump, and the heat supply delivery pipe is communicated with the heat supply tank through a heat supply liquid inlet pipe; A heat supply collection pipe, which is communicated with the top of the liquid storage tank, and the heat supply collection pipe is communicated with the annular collection tank through a heat supply liquid discharge pipe.

[0014] On the basis of the foregoing solution, it further includes: A box body, which is fixedly installed on the side of the injection molding machine body; A second water pump, which is fixedly installed on the box body, and the second water pump is communicated with the box body through a pipeline; A cooling delivery pipe, the output end of the second water pump is communicated with two cooling delivery pipes through joints. One of the cooling delivery pipes is communicated with the female mold liquid inlet pipe, and the other cooling delivery pipe is communicated with the collection cylinder through a cooling liquid inlet pipe; Cooling collection pipes, there are two cooling collection pipes. One cooling collection pipe is communicated between the top of the box body and the female mold liquid discharge pipe, and the other cooling collection pipe is communicated with the cooling tank through a cooling liquid discharge pipe and is communicated with the top of the box body at the other end.

[0015] An injection molding method for a plastic valve well, using an injection molding machine for a plastic valve well as described above, includes the following steps: First step, mold clamping. Start the injection molding machine body, drive the moving mold to drive the male mold to move through the mold clamping system until the male mold and the female mold are closed, and then switch to high-pressure locking; Second step, mold heating. Start the first water pump to deliver the medium in the liquid storage tank to the heater for heating, and then flow into the heating tank through the heat supply delivery pipe and the heat supply inlet pipe. The high-temperature heat-conducting medium is transported from the heating tank to the heating and temperature-guiding frame through the heat supply pipe to heat the male mold, thereby heating the molding cavity; Third step, high-temperature medium recovery. The return pipe guides the medium back to the annular collection tank, and the medium flowing through the heating and temperature-guiding frame is sent into the annular collection tank through the return pipe, and then sent into the heat supply collection pipe through the heat supply drain pipe, and finally the medium is guided back to the liquid storage tank; Fourth step, injection molding. Put the plastic raw material into the feeding end of the injection molding machine body, and drive the screw in the injection molding machine to rotate, melt the plastic particles and push them to the front end of the barrel, inject the molten plastic into the interior of the molding cavity for filling at a set speed, and then perform secondary compensation until the remaining filling is completed. After the injection molding is completed, turn off the first water pump and then hold the pressure; Fifth step, finished product cooling. Start the second water pump to deliver the medium in the box to the cooling delivery pipe, which flows into the female mold inlet pipe and the cooling inlet pipe respectively. The medium entering the cooling inlet pipe enters the interior of the collection cylinder, and enters the cooling and temperature-guiding frame through the liquid supply pipe to cool the male mold, and the return pipe guides the medium back to the cooling tank; Sixth step, female mold cooling. The female mold inlet pipe synchronously delivers the cooling medium to the cooling cavity in the female mold. The medium flows into the top of the cooling cavity from the female mold inlet pipe, fills the cooling cavity until the medium is discharged through the female mold drain pipe, and flows into the cooling collection pipe through the cooling drain pipe and returns to the box to form a cycle; Seventh step, mold opening. After cooling and shaping, the mold can be opened, and the finished product is pushed out through structures such as ejector pins. The finished product will fall into the discharging position of the injection molding machine body, and then the finished product is taken out.

[0016] The beneficial effects of the embodiments of the present disclosure are as follows: 1. In the present disclosure, the flow direction of the high-temperature medium is from the heating tank through the heat supply pipe to the heating and temperature-guiding frame, and then returns to the annular collection tank through the return pipe, so that the temperature at the end of the heat-conducting and temperature-guiding frame far from the female mold is higher than the temperature at the end close to the female mold, thereby realizing the gradient distribution of the temperature in the molding cavity, ensuring uniform cooling of the plastic melt during the filling process, avoiding internal stress concentration caused by excessive temperature difference, and at the same time reducing the phenomenon of incomplete filling caused by too fast cooling during the injection molding of larger-sized finished products, effectively improving the molding quality of the finished product.

[0017] 2. In the present disclosure, since tooth-shaped structures are provided on both sides of each heating and heat-conducting frame, and both sides of each cooling and heat-conducting frame are adapted to the tooth-shaped structures on both sides of the heating and heat-conducting frame, there is a transition region between every two adjacent cooling and heat-conducting frames and the heating and heat-conducting frame, making the temperature control more uniform. The heat exchange efficiency is improved through the cooperation of the tooth-shaped structures, enabling the finished product to maintain a temperature gradient during the cooling process and avoiding deformation caused by uneven cooling.

[0018] 3. In the present disclosure, through the setting of the temperature control assembly, the molding chamber is heated during injection molding. When forming large-sized components such as plastic valve wells, the phenomenon of incomplete filling can be effectively avoided. At the same time, the temperature can be accurately adjusted during cooling. Under the action of the cooling component, the temperature difference between the inside and outside of the finished product is minimized, the thermal stress is reduced, and the surface finish and structural stability of the finished product are further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following will briefly introduce the drawings required for the description of the embodiments of the present disclosure. Obviously, the following drawings are only some exemplary embodiments of the present disclosure. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the content of the exemplary embodiments of the present disclosure and these drawings.

[0020] Figure 1 It is a schematic structural diagram of the whole in the present invention; Figure 2 It is a schematic structural diagram of the whole from another angle in the present invention; Figure 3 It is a schematic structural diagram of the whole from another angle in the present invention; Figure 4 It is a schematic structural diagram of the cooperation between the female mold and the male mold in the present invention; Figure 5 It is a schematic cross-sectional structural diagram of the cooperation between the moving mold, the male mold and the temperature control assembly in the present invention; Figure 6 It is a schematic cross-sectional structural diagram of the temperature control assembly in the present invention; Figure 7 It is a schematic cross-sectional structural diagram of the temperature control assembly from another angle in the present invention; Figure 8 It is a schematic cross-sectional structural diagram of the cooperation between the heat supply groove and the annular collection groove and the moving mold in the present invention; Figure 9 It is a schematic cross-sectional structural diagram of the cooperation between the cooling groove and the collection cylinder and the moving mold in the present invention; Figure 10 It is a schematic cross-sectional structural diagram of the cooling component in the present invention.

[0021] In the figure: 1, the main body of the injection molding machine; 2, the fixed mold; 3, the movable mold; 4, the female mold; 5, the male mold; 6, the heating and temperature guiding frame; 7, the cooling and temperature guiding frame; 8, the heat supply tank; 9, the heat supply pipe; 10, the annular collection tank; 11, the return pipe; 12, the cooling tank; 13, the liquid return pipe; 14, the collection cylinder; 15, the liquid supply pipe; 16, the liquid inlet pipe of the female mold; 17, the liquid discharge pipe of the female mold; 18, the liquid storage tank; 19, the first water pump; 20, the heater; 21, the heat supply conveying pipe; 22, the heat supply liquid inlet pipe; 23, the heat supply collection pipe; 24, the heat supply liquid discharge pipe; 25, the box body; 26, the second water pump; 27, the cooling conveying pipe; 28, the cooling liquid inlet pipe; 29, the cooling collection pipe; 30, the cooling liquid discharge pipe. Specific implementation mode

[0022] The following further elaborates on the present disclosure in conjunction with the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present disclosure, rather than limiting the present disclosure.

[0023] To simplify the drawings, only the parts related to the disclosure are schematically shown in each figure, and they do not represent their actual structures as products. Additionally, to simplify the drawings for easy understanding, in some figures, components with the same structure or function are only schematically shown for one of them, or only one of them is labeled. In this article, "one" not only means "only this one", but also can mean "more than one" situation, and "several" includes "two" and "more than two".

[0024] In this article, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0025] In the present disclosure, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature can include the direct contact between the first and second features, or can also include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above", and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher horizontal height than the second feature. The first feature being "below", "below", and "under" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicating that the first feature is at a lower horizontal height than the second feature.

[0026] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "left", and "right" are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of description and simplifying operations, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present disclosure.

[0027] In addition, in the description of this application, the terms "first", "second", etc. are only used for distinguishing descriptions and cannot be construed as indicating or implying relative importance.

[0028] Embodiment 1, as Figures 1 to 10 shown, which shows an injection molding machine for a plastic valve well in an embodiment of the present disclosure. It includes an injection molding machine body 1. A fixed mold 2 and a movable mold 3 are also installed at the working position of the injection molding machine body 1. The fixed mold 2 is adapted to the movable mold 3. It also includes a female mold 4, a male mold 5, a heating and temperature guiding frame 6, a cooling and heat preservation frame 7, and a temperature control component. The female mold 4 is installed on the fixed mold 2, and the male mold 5 is installed on the movable mold 3. The male mold 5 is configured to be able to form a molding cavity with the female mold 4. Among them, a cooling cavity is provided inside the female mold 4. Inside the male mold 5, a number of heating and temperature guiding frames 6 and a number of cooling and temperature guiding frames 7 are fixedly installed at equal angles in a circumferential shape. The number of heating and temperature guiding frames 6 and the number of cooling and temperature guiding frames 7 are arranged alternately. Each of the heating and temperature guiding frames 6 and each of the cooling and temperature guiding frames 7 has a hollow structure inside. A toothed structure is provided and adapted between every two adjacent heating and temperature guiding frames 6 and the cooling and temperature guiding frames 7. Temperature control components are installed on both the male mold 5 and the female mold 4 for controlling the temperature inside the molding cavity during the processing of the plastic valve well. The temperature control component includes the heating and temperature guiding frame 6, the cooling and temperature guiding frame 7, a heat supply part, and a cooling part. The heat supply part is installed on the movable mold 3 for providing heat during the injection molding process. Cooling parts are installed on both the movable mold 3 and the female mold 4 for cooling the finished plastic valve well. There is a transition area for transferring temperature between every two adjacent cooling and temperature guiding frames 7 and heating and temperature guiding frames 6.

[0029] Specifically, before injection molding, first install the male mold 5 on the moving mold 3 and move it with the clamping system of the injection molding machine body 1. Then install the female mold 4 on the fixed mold 2 of the injection molding machine body 1, and connect the discharge end of the feeding system to the female mold 4. Then injection molding can start. At this time, heat the barrel part of the injection molding machine body 1 until the temperature rises to the process temperature and holds for a period of time. At the same time, start the injection molding machine body 1, drive the moving mold 3 through the clamping system to drive the male mold 5 to move until the male mold 5 closes with the female mold 4. Then switch to high-pressure locking, and then start the heating part to heat the multiple heating and heat-conducting frames 6, so that the male mold 5 is heated, and the molding cavity can be heated to the temperature required by the process. At this time, the injection molding process can start. Put the plastic raw material into the feeding end of the injection molding machine body 1, and drive the screw in the injection molding machine to rotate, melt the plastic particles and push them to the front end of the barrel, and inject the molten plastic into the molding cavity at a set speed for filling. Then reduce the speed to less than half of the original injection speed for secondary compensation shrinkage until the remaining filling is completed to avoid jetting marks. At this time, the heating part can be turned off, and then maintain about 70% of the injection pressure to compensate for shrinkage. The holding pressure time is wall thickness × 1.5 s / mm. Then start the cooling part, cool the male mold 5 through the cooling and heat-conducting frame 7, and cool the female mold 4 through the setting of the cooling cavity, so as to cool the finished product. After cooling and shaping, the mold can be opened, and the finished product can be pushed out through structures such as ejector pins. The finished product will fall into the discharge position of the injection molding machine body 1, and then the finished product can be taken out.

[0030] As described above, such as Figures 5 to 9 shown, the heating part includes a heating tank 8, a heating pipe 9, an annular collecting tank 10 and a return pipe 11. The heating tank 8 is opened inside the moving mold 3. The heating tank 8 is set in a C shape. One end of each heating and heat-conducting frame 6 away from the female mold 4 is communicated with a heating pipe 9, and each heating pipe 9 is communicated with the heating tank 8. Among them, in the working state of the heating and heat-conducting frame 6, the temperature of the end close to the female mold 4 is lower than the temperature of the end away from the female mold 4. The annular collecting tank 10 is opened inside the moving mold 3, and the annular collecting tank 10 is arranged inside the heating tank 8. One end of each heating and heat-conducting frame 6 close to the female mold 4 is communicated with a return pipe 11, and each return pipe 11 is communicated with the annular collecting tank 10.

[0031] Specifically, when heating the forming cavity, through the setting of the liquid supply component, the high-temperature heat-conducting medium is transported from the heat supply tank 8 to the heating and temperature-guiding frame 6 through the heat supply pipe 9, uniformly heating the male mold 5. The return pipe 11 then guides the medium back to the annular collection tank 10, and the medium is recycled through the return pipe 11, and the circulating heating ensures a stable temperature, ensuring that the forming cavity reaches a uniform process temperature. During the injection molding process, since the flow direction of the high-temperature medium is from the heat supply tank 8 through the heat supply pipe 9 to the heating and temperature-guiding frame 6, and then returns to the annular collection tank 10 through the return pipe 11, the temperature at the end of the heat-conducting and temperature-guiding frame far from the female mold 4 is higher than the temperature at the end close to the female mold 4, thereby realizing a gradient distribution of the temperature in the forming cavity, ensuring uniform cooling of the plastic melt during the filling process, avoiding stress concentration caused by excessive temperature difference, and effectively avoiding the problem of local overheating at the same time, ensuring the uniformity of the mold temperature, thereby improving the forming quality and surface finish of the finished product.

[0032] As described above, Figures 5 to 9 As shown in the figure, the cooling part includes a cooling tank 12 and a liquid return pipe 13. The cooling tank 12 is opened inside the moving mold 3. The cooling tank 12 is arranged in a C shape. One end of each cooling and temperature-guiding frame 7 far from the female mold 4 is communicated with a liquid return pipe 13, and each liquid return pipe 13 is communicated with the cooling tank 12. Among them, in the working state of the cooling and temperature-guiding frame 7, the temperature at the end close to the female mold 4 is lower than the temperature at the end far from the female mold 4. It also includes a collection cylinder 14, a liquid supply pipe 15 and a cooling component. The collection cylinder 14 is fixedly installed inside the moving mold 3. The collection cylinder 14 is located inside the cooling tank 12. A liquid supply pipe 15 is communicated between one end of each cooling and temperature-guiding frame 7 close to the female mold 4 and the collection cylinder 14. The cooling component is installed inside the female mold 4 for cooling the finished product.

[0033] Specifically, when it is necessary to cool and shape the finished product, the low-temperature cooling medium is transported to the collection cylinder 14 through the liquid supply component, and then flows into the cooling and temperature-guiding frame 7 through the liquid supply pipe 15, uniformly cooling the male mold 5. The liquid return pipe 13 guides the medium back to the cooling tank 12, and the circulating cooling ensures a stable temperature. At the same time, the cooling component synchronously sends the cooling medium into the cooling cavity inside the female mold 4, realizing the synchronous cooling of the female mold 4 and the male mold 5, further optimizing the cooling effect of the finished product, quickly cooling the finished product, ensuring the consistency of the internal and external temperatures of the finished product, and improving the cooling effect and structural stability of the finished product.

[0034] As described above, Figure 10 As shown in the figure, the cooling component includes a female mold liquid inlet pipe 16 and a female mold liquid discharge pipe 17. The female mold liquid inlet pipe 16 and the female mold liquid discharge pipe 17 are both fixedly installed on the fixed mold 2. The female mold liquid inlet pipe 16 is communicated with the top of the cooling cavity, and the female mold liquid discharge pipe 17 is communicated with the bottom of the cooling cavity.

[0035] Specifically, when delivering the low-temperature cooling medium to the master mold 4, the medium flows into the top of the cooling chamber from the master mold liquid inlet pipe 16, gradually fills the cooling chamber, and then sinks to the bottom and is discharged through the master mold liquid discharge pipe 17, forming a directional cooling flow, ensuring uniform temperature distribution inside the master mold 4, effectively preventing deformation caused by uneven cooling, and further improving the quality of the finished product.

[0036] As described above, such as Figure 2 , Figure 3 shown, it further includes a liquid supply assembly. The liquid supply assembly is installed on the injection molding machine body 1 and is used to provide liquid for the temperature control assembly. It also includes a liquid storage tank 18, a first water pump 19, a heater 20, a heat supply delivery pipe 21, and a heat supply collection pipe 23. The liquid storage tank 18 is fixedly installed on the side of the injection molding machine body 1. The first water pump 19 is fixedly installed on the liquid storage tank 18. The output end of the heater 20 is communicated with the input end of the first water pump 19. The heater 20 is fixedly installed on the liquid storage tank 18. The input end of the heater 20 is communicated with the liquid storage tank 18. The heat supply delivery pipe 21 is communicated with the output end of the first water pump 19. The heat supply delivery pipe 21 is communicated with the heat supply tank 8 through the heat supply liquid inlet pipe 22. The heat supply collection pipe 23 is communicated with the top of the liquid storage tank 18. The heat supply collection pipe 23 is communicated with the annular collection tank 10 through the heat supply liquid discharge pipe 24. It further includes a box body 25, a second water pump 26, a cooling delivery pipe 27, and a cooling collection pipe 29. The box body 25 is fixedly installed on the side of the injection molding machine body 1. The second water pump 26 is fixedly installed on the box body 25. The second water pump 26 is communicated with the box body 25 through a pipeline. The output end of the second water pump 26 is communicated with two cooling delivery pipes 27 through a joint. One of the cooling delivery pipes 27 is communicated with the master mold liquid inlet pipe 16. The other cooling delivery pipe 27 is communicated with the collection cylinder 14 through the cooling liquid inlet pipe 28. There are two cooling collection pipes 29. One cooling collection pipe 29 is communicated between the top of the box body 25 and the master mold liquid discharge pipe 17. The other cooling collection pipe 29 is communicated with the cooling tank 12 through the cooling liquid discharge pipe 30, and the other end is communicated with the top of the box body 25.

[0037] Specifically, when providing the high-temperature heat-conducting medium, start the first water pump 19. The first water pump 19 transports the medium in the liquid storage tank 18 to the heater 20 for heating, and then through the heat supply delivery pipe 21, it flows into the heat supply tank 8 through the heat supply inlet pipe 22, and then evenly heats the male mold 5 through the heating and temperature-guiding frame 6. The return pipe 11 sends the medium flowing through the heating and temperature-guiding frame 6 into the annular collection tank 10, and then through the heat supply drain pipe 24 into the heat supply collection pipe 23, and finally guides the medium back to the liquid storage tank 18. Just ensure the temperature stability through cyclic heat supply. When providing the low-temperature cooling medium, start the second water pump 26. The second water pump 26 transports the medium in the box body 25 to the cooling delivery pipe 27, and it flows into the female mold inlet pipe 16 and the cooling inlet pipe 28 respectively. The medium entering the cooling inlet pipe 28 enters the interior of the collection cylinder 14, and through the liquid supply pipe 15, it enters the cooling and temperature-guiding frame 7. The cooling and temperature-guiding frame 7 evenly distributes the medium to the male mold 5. The cooled medium enters the cooling tank 12 through the liquid return pipe 13, and then through the cooling drain pipe 30 into the cooling collection pipe 29 and returns to the box body 25. The female mold drain pipe 17 in the female mold 4 also returns to the box body 25 through the cooling collection pipe 29, thus forming a cycle to ensure a constant cooling effect and guarantee the precise control of the mold temperature.

[0038] The working principle or usage process of this application is as follows: Before injection molding, first install the male mold 5 on the moving mold 3 and move it along with the mold clamping system of the injection molding machine body 1. Then install the female mold 4 on the fixed mold 2 of the injection molding machine body 1, and connect the discharge end of the feeding system to the female mold 4, and then injection molding can start. At this time, heat the barrel part of the injection molding machine body 1 until it rises to the process temperature and keeps warm for a period of time. At the same time, start the injection molding machine body 1, drive the moving mold 3 to drive the male mold 5 to move through the mold clamping system until the male mold 5 closes with the female mold 4, and then switch to high-pressure locking. Then heat the multiple heating and temperature-guiding frames 6. At this time, start the first water pump 19 to transport the medium in the liquid storage tank 18 to the heater 20 for heating, and then through the heat supply delivery pipe 21, it flows into the heat supply tank 8 through the heat supply inlet pipe 22. The high-temperature heat-conducting medium is transported from the heat supply tank 8 to the heating and temperature-guiding frame 6 through the heat supply pipe 9 to evenly heat the male mold 5. The return pipe 11 then guides the medium back to the annular collection tank 10, and through the return pipe 11, the medium flowing through the heating and temperature-guiding frame 6 is sent into the annular collection tank 10, and then through the heat supply drain pipe 24 into the heat supply collection pipe 23, and finally guides the medium back to the liquid storage tank 18.

[0039] After the temperature of the molding chamber reaches the requirement, the injection molding process can start. Put the plastic raw material into the feeding end of the injection molding machine body 1, and drive the screw in the injection molding machine to rotate, melt the plastic particles and push them to the front end of the barrel. Inject the molten plastic into the interior of the molding chamber for filling at a set speed, and then reduce the speed to less than half of the original injection speed for secondary compensation shrinkage until the remaining filling is completed to avoid jetting marks. Since the flow direction of the high-temperature medium is from the heat supply tank 8 through the heat supply pipe 9 to the heating and temperature guiding frame 6, and then returns to the annular collection tank 10 through the return pipe 11, the temperature at the end of the heat conduction and temperature guiding frame far from the female mold 4 is higher than that at the end close to the female mold 4, thus realizing a gradient distribution of the temperature in the molding chamber, ensuring uniform cooling of the plastic melt during the filling process, avoiding stress concentration caused by excessive temperature difference, and effectively avoiding the problem of local overheating, ensuring the uniformity of the mold temperature, thereby improving the molding quality and surface finish of the finished product. After the injection molding is completed, turn off the first water pump 19, and then maintain about 70% of the injection pressure to compensate for shrinkage. The holding pressure time is wall thickness × 1.5 s / mm.

[0040] Then cool and shape the finished product. When providing low-temperature cooling medium, start the second water pump 26. The second water pump 26 transports the medium in the box body 25 to the cooling delivery pipe 27, which flows into the female mold inlet pipe 16 and the cooling inlet pipe 28 respectively. The medium entering the cooling inlet pipe 28 enters the interior of the collection cylinder 14, and enters the cooling and temperature guiding frame 7 through the liquid supply pipe 15 to uniformly cool the male mold 5. The return pipe 13 guides the medium back to the cooling tank 12 for circulating cooling to ensure temperature stability, ensuring the consistency of the internal and external temperatures of the finished product, improving the cooling effect and structural stability of the finished product. At the same time, the female mold inlet pipe 16 synchronously sends the cooling medium into the cooling chamber in the female mold 4. The medium flows into the top of the cooling chamber from the female mold inlet pipe 16, gradually fills the cooling chamber, and until it sinks to the bottom and is discharged through the female mold drain pipe 17 to form a directional cooling flow, ensuring uniform distribution of the temperature inside the female mold 4, realizing synchronous cooling of the female mold 4 and the male mold 5, effectively preventing deformation of the finished product caused by uneven cooling. The cooled medium flows into the cooling collection pipe 29 through the cooling drain pipe 30 and returns to the box body 25, and the female mold drain pipe 17 in the female mold 4 also returns to the box body 25 through the cooling collection pipe 29, thus forming a cycle to ensure a constant cooling effect and ensure precise control of the mold temperature. After cooling and shaping, the mold can be opened, and the finished product is pushed out through structures such as ejector pins. The finished product will fall into the discharging position of the injection molding machine body 1, and then the finished product can be taken out.

[0041] Embodiment 2: Based on an injection molding machine for a plastic valve well, this Embodiment 2 also proposes an injection molding method for a plastic valve well, including the following steps: The first step is to close the mold. Start the injection molding machine body 1, drive the moving mold 3 to drive the male mold 5 to move through the mold closing system until the male mold 5 is closed with the female mold 4, and then switch to high-pressure locking.

[0042] In the second step, the mold is heated. The first water pump 19 is started to convey the medium in the liquid storage tank 18 to the heater 20 for heating, and then through the heat supply conveying pipe 21, it flows into the heat supply tank 8 through the heat supply liquid inlet pipe 22. The high-temperature heat-conducting medium is conveyed from the heat supply tank 8 to the heating and temperature-guiding frame 6 through the heat supply pipe 9 to uniformly heat the male mold 5, thereby increasing the temperature of the forming cavity.

[0043] In the third step, the high-temperature medium is recycled. The return pipe 11 guides the medium back to the annular collecting tank 10, and the medium flowing through the heating and temperature-guiding frame 6 is sent into the annular collecting tank 10 through the return pipe 11, and then sent into the heat supply collecting pipe 23 through the heat supply drain pipe 24, and finally the medium is guided back to the liquid storage tank 18.

[0044] In the fourth step, injection molding is carried out. The plastic raw material is put into the feeding end of the injection molding machine body 1, and the screw inside the injection molding machine is driven to rotate to melt the plastic particles and push them to the front end of the barrel. The molten plastic is injected into the inside of the forming cavity for filling at a set speed, and then reduced to less than half of the original injection speed for secondary compensation shrinkage until the remaining filling is completed to avoid jetting marks. After the injection molding is completed, the first water pump 19 is turned off, and then about 70% of the injection pressure is maintained to compensate for shrinkage. The holding pressure time is wall thickness × 1.5 s / mm.

[0045] In the fifth step, the finished product is cooled. The second water pump 26 is started to convey the medium in the box body 25 to the cooling conveying pipe 27, which flows into the female mold liquid inlet pipe 16 and the cooling liquid inlet pipe 28 respectively. The medium entering the cooling liquid inlet pipe 28 enters the inside of the collecting cylinder 14 and enters the cooling and temperature-guiding frame 7 through the liquid supply pipe 15 to uniformly cool the male mold 5. The liquid return pipe 13 guides the medium back to the cooling tank 12, and the circulating cooling ensures a stable temperature, ensuring the consistency of the internal and external temperatures of the finished product and improving the cooling effect and structural stability of the finished product.

[0046] In the sixth step, the female mold is cooled. The female mold liquid inlet pipe 16 synchronously sends the cooling medium into the cooling cavity in the female mold 4. The medium flows into the top of the cooling cavity from the female mold liquid inlet pipe 16, gradually fills the cooling cavity, and until it sinks to the bottom and is discharged through the female mold drain pipe 17, forming a directional cooling flow to ensure uniform temperature distribution inside the female mold 4, realizing the synchronous cooling of the female mold 4 and the male mold 5, effectively preventing the deformation of the finished product caused by uneven cooling. The cooled medium flows into the cooling collecting pipe 29 through the cooling drain pipe 30 and returns to the box body 25, and the female mold drain pipe 17 in the female mold 4 also returns to the box body 25 through the cooling collecting pipe 29, thus forming a cycle to ensure a constant cooling effect and ensure precise control of the mold temperature.

[0047] In the seventh step, the mold is opened. After cooling and shaping, the mold can be opened, and the finished product is pushed out through structures such as ejector pins. The finished product will fall into the discharging position of the injection molding machine body 1, and then the finished product can be taken out.

[0048] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure rather than to limit them. Although the present disclosure has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present disclosure can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present disclosure, and they should all be covered by the scope of the claims of the present disclosure.

Claims

1. An injection molding machine for a plastic valve well, comprising an injection molding machine body (1), wherein a fixed mold (2) and a movable mold (3) are installed at a working position of the injection molding machine body (1), wherein the fixed mold (2) and the movable mold (3) are adapted to each other, and wherein: Also includes: A mother mold (4), the mother mold (4) being mounted on the fixed mold (2); A male mold (5), the movable mold (3) being provided with the male mold (5), the male mold (5) being configured to form a molding cavity with the female mold (4); Wherein, a cooling chamber is provided inside the mother mold (4); A heating temperature conducting frame (6) and a cooling temperature insulation frame (7), wherein a plurality of heating temperature conducting frames (6) and a plurality of cooling temperature conducting frames (7) are fixedly installed at equal angles in a circular shape inside the male mold (5), a plurality of the heating temperature conducting frames (6) and a plurality of the cooling temperature conducting frames (7) are arranged alternately, each of the heating temperature conducting frames (6) and each of the cooling temperature conducting frames (7) has a hollow structure inside, and a toothed structure is provided between each two adjacent heating temperature conducting frames (6) and cooling temperature conducting frames (7) and adapted to each other; A temperature control component is installed on both the male mold (5) and the female mold (4) and is used to control the temperature in the molding chamber when processing the plastic valve well.

2. An injection molding machine for a plastic valve well according to claim 1, characterized in that: The temperature control component comprises: A heating part, the heating part is installed on the movable mold (3) and is used to provide heat for the injection molding process; A cooling part is installed on both the movable mold (3) and the mother mold (4) and is used to cool the finished plastic valve well.

3. An injection molding machine for a plastic valve well according to claim 2, characterized in that: There is a transition area for transferring temperature between each two adjacent cooling temperature conducting racks (7) and the heating temperature conducting racks (6).

4. An injection molding machine for a plastic valve well according to claim 3, characterized in that: The heating unit comprises: A heat supply groove (8), the heat supply groove (8) being disposed inside the movable mold (3), and the heat supply groove (8) being configured to be C-shaped; A heating pipe (9), wherein one end of each heating temperature conducting frame (6) away from the mother mold (4) is connected to the heating pipe (9), and each heating pipe (9) is connected to the heating groove (8); Wherein, when the heating temperature conducting frame (6) is in a working state, the temperature at one end close to the mother mold (4) is lower than the temperature at one end away from the mother mold (4); an annular collecting groove (10), the annular collecting groove (10) being opened inside the movable mold (3), and the annular collecting groove (10) being arranged inside the heating groove (8); A reflux pipe (11), wherein one end of each of the heating and temperature conducting racks (6) close to the mother mold (4) is connected to the reflux pipe (11), and each of the reflux pipes (11) is connected to the annular collecting groove (10).

5. An injection molding machine for a plastic valve well according to claim 4, characterized in that: The cooling unit comprises: A cooling groove (12), the cooling groove (12) being opened inside the movable mold (3), and the cooling groove (12) being arranged in a C shape; A liquid return pipe (13), wherein one end of each cooling and temperature conducting frame (7) away from the mother mold (4) is connected to the liquid return pipe (13), and each liquid return pipe (13) is connected to the cooling tank (12); Wherein, when the cooling and temperature conducting frame (7) is in a working state, the temperature of an end close to the mother mold (4) is lower than the temperature of an end far from the mother mold (4).

6. An injection molding machine for a plastic valve well according to claim 5, characterized in that: Also includes: A collecting cylinder (14), the collecting cylinder (14) being fixedly mounted inside the movable mold (3), the collecting cylinder (14) being located inside the cooling groove (12); A liquid supply pipe (15), wherein the liquid supply pipe (15) is connected between one end of each cooling and temperature conducting frame (7) close to the mother mold (4) and the collecting cylinder (14); A cooling component is installed inside the mother mold (4) and is used to cool the finished product.

7. An injection molding machine for a plastic valve well according to claim 6, characterized in that: The cooling component comprises a mother mold liquid inlet pipe (16) and a mother mold liquid discharge pipe (17), wherein the mother mold liquid inlet pipe (16) and the mother mold liquid discharge pipe (17) are both fixedly mounted on the fixed mold (2), the mother mold liquid inlet pipe (16) is connected to the top of the cooling chamber, and the mother mold liquid discharge pipe (17) is connected to the bottom of the cooling chamber.

8. The injection molding machine for a plastic valve well according to claim 7, further comprising a liquid supply component, the liquid supply component being mounted on the injection molding machine body (1) and used to provide liquid to the temperature control component, characterized in that: Also includes: A liquid storage tank (18), the liquid storage tank (18) being fixedly mounted on the side of the injection molding machine body (1); a first water pump (19), the first water pump (19) being fixedly mounted on the liquid storage tank (18); a heater (20), wherein an output end of the heater (20) is in communication with an input end of the first water pump (19), the heater (20) is fixedly mounted on the liquid storage tank (18), and an input end of the heater (20) is in communication with the liquid storage tank (18); A heat supply delivery pipe (21), the heat supply delivery pipe (21) being connected to the output end of the first water pump (19), and the heat supply delivery pipe (21) being connected to the heat supply tank (8) via a heat supply liquid inlet pipe (22); A heat supply collecting pipe (23), the heat supply collecting pipe (23) being connected to the top of the liquid storage tank (18), and the heat supply collecting pipe (23) being connected to the annular collecting tank (10) via a heat supply liquid discharge pipe (24).

9. An injection molding machine for a plastic valve well according to claim 8, characterized in that: Also includes: A box body (25), the box body (25) being fixedly mounted on the side of the injection molding machine body (1); a second water pump (26), the second water pump (26) being fixedly mounted on the box (25), the second water pump (26) being in communication with the box (25) via a pipeline; A cooling delivery pipe (27), wherein the output end of the second water pump (26) is connected to two cooling delivery pipes (27) via a joint, wherein one of the cooling delivery pipes (27) is connected to the mother mold liquid inlet pipe (16), and the other cooling delivery pipe (27) is connected to the collecting cylinder (14) via a cooling liquid inlet pipe (28); A cooling collection pipe (29), wherein two cooling collection pipes (29) are provided, one cooling collection pipe (29) is connected between the top of the box body (25) and the mother mold drain pipe (17), and the other cooling collection pipe (29) is connected to the cooling tank (12) through a cooling drain pipe (30), and the other end is connected to the top of the box body (25).

10. An injection molding method for a plastic valve well, using the injection molding machine for a plastic valve well according to claim 9, characterized in that: The following steps are involved: The first step is to close the mold, start the injection molding machine body (1), drive the movable mold (3) through the mold closing system to drive the male mold (5) to move until the male mold (5) and the female mold (4) are closed, and then switch to high-pressure locking; The second step is to heat the mold. The first water pump (19) is started to transport the medium in the liquid storage tank (18) to the heater (20) for heating. The medium then flows into the heating tank (8) through the heating liquid inlet pipe (22) via the heating transport pipe (21). The high-temperature heat-conducting medium is transported from the heating tank (8) through the heating pipe (9) to the heating temperature-conducting rack (6) to heat the male mold (5), thereby heating the molding chamber. The third step is to recover the high-temperature medium. The reflux pipe (11) guides the medium back to the annular collection tank (10), and the medium flowing through the heating temperature conducting rack (6) is sent to the annular collection tank (10) through the reflux pipe (11), and then sent to the heating collection pipe (23) through the heating liquid discharge pipe (24), and finally the medium is guided back to the liquid storage tank (18); The fourth step is injection molding, in which the plastic raw material is fed into the feed end of the injection molding machine body (1), and the screw in the injection molding machine is driven to rotate, so that the plastic particles are melted and pushed to the front end of the barrel, and the molten plastic is injected into the molding chamber at a set speed for filling, and then the second stage of shrinkage is performed until the remaining filling is completed. After the injection molding is completed, the first water pump (19) is turned off, and then the pressure is maintained; Step 5: Cooling the finished product. Start the second water pump (26) to transport the medium in the box (25) to the cooling transport pipe (27), and then flow into the female mold liquid inlet pipe (16) and the cooling liquid inlet pipe (28). The medium entering the cooling liquid inlet pipe (28) enters the interior of the collecting cylinder (14), and enters the cooling temperature conducting frame (7) through the liquid supply pipe (15) to cool the male mold (5). The return pipe (13) guides the medium back to the cooling tank (12). The sixth step is cooling the master mold. The master mold liquid inlet pipe (16) simultaneously delivers the cooling medium to the cooling chamber in the master mold (4). The medium flows from the master mold liquid inlet pipe (16) into the top of the cooling chamber and fills the cooling chamber until the medium is discharged through the master mold liquid discharge pipe (17), flows into the cooling collection pipe (29) through the cooling liquid discharge pipe (30) and returns to the box (25), thus forming a cycle. The seventh step is to open the mold. After cooling and shaping, the mold can be opened. The finished product is pushed out through the ejector pin and other structures. The finished product will fall into the discharge position of the injection molding machine body (1), and then the finished product can be taken out.

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