Rubber injection molding mold and temperature control method thereof

Abstract

The invention belongs to the technical field of rubber part production devices, and particularly relates to a rubber injection molding mold and a temperature control method thereof.The mold comprises a fixed mold plate and a movable mold plate, a plurality of straight-through runners are arranged in the fixed mold plate and the movable mold plate in parallel, opening and closing valves are arranged at the two ends of each straight-through runner, and a conduction runner with an opening and closing part is arranged between every two adjacent straight-through runners; wherein the flow directions of heat exchange media in every two adjacent straight-through flow channels are opposite, a plurality of conducting flow channels are alternately arranged, parallel straight-through flow channels, parallel U-shaped flow channels or single series flow channels can be formed by adjusting the opening and closing valves and the opening and closing pieces, and flexible switching is achieved so as to meet different temperature control requirements; the conduction runners are alternately arranged, so that the influence of switching on heat exchange can be reduced, runner switching and medium parameter adjustment are carried out cooperatively, temperature deviation can be responded in time, temperature change fluctuation is reduced, overshoot or lag is avoided, temperature control stability is improved, and the strict requirement of rubber vulcanization for the temperature is met.

Description

Technical Field

[0001] This invention belongs to the technical field of rubber parts production equipment, and particularly relates to a rubber injection molding die and its temperature control method. Background Technology

[0002] While both rubber injection molding and plastic injection molding involve temperature control requirements, rubber is more sensitive to temperature control than plastic. However, existing rubber injection molding molds mostly have fixed runner structures (such as series or parallel connections), which cannot dynamically adjust the flow pattern of the heat exchange medium within the mold runner according to the mold temperature, resulting in the following drawbacks: 1. Insufficient temperature control accuracy: Fixed flow channels cannot meet the full-stage requirements of "rapid heating / cooling-smooth transition-low-consumption heat preservation". For example, efficient heat exchange is required when heating / cooling, smooth heat exchange is required when approaching the target temperature, and low-consumption heat preservation is required when maintaining the temperature. Fixed flow channels cannot meet all these requirements. 2. Poor heat exchange uniformity: The heat exchange medium in adjacent channels is easily set to flow in the same direction, which leads to concentrated heat exchange in local areas and affects the consistency of vulcanization of rubber products; 3. Low adjustment flexibility: It cannot respond to temperature deviations by switching the flow channel state. For example, it can only adjust the heat exchange medium flow rate and heat exchange medium temperature. The response speed is slow and it is easy to overshoot or lag. Summary of the Invention

[0003] The purpose of this invention is to address the aforementioned technical problems by providing a rubber injection molding die and its temperature control method. This method enables flexible switching of the flow mode of the heat exchange medium within the die channel to adapt to the temperature control requirements of the entire rubber injection molding process, improve heat exchange uniformity, and enhance the adjustment response speed.

[0004] In view of this, the present invention provides a rubber injection molding die, including a fixed mold plate and a movable mold plate, wherein both the fixed mold plate and the movable mold plate are provided with a plurality of parallel straight flow channels, and both ends of the straight flow channels are provided with opening and closing valves; A connecting channel is provided between each pair of adjacent straight channels, and an opening and closing element is provided in the connecting channel for controlling its opening and closing. In this system, the heat exchange medium flows in opposite directions in two adjacent straight-through channels, multiple conductive channels are arranged alternately, and the opening and closing adjustment of the valves and components are used to form parallel straight-through channels, parallel U-shaped channels, or single series channels.

[0005] In the above technical solution, the opening and closing element further includes: The first annular protrusion is set on the inner wall of the guide channel and forms a sealing surface on both sides along the axial direction; Two valve cores are installed in the flow channel and respectively cooperate with the sealing surfaces on both sides of the first annular protrusion to form a sealing connection; A spring is installed inside the flow channel, and a second annular protrusion is provided on the inner wall of the flow channel. The two ends of the spring abut against the valve core and the second annular protrusion, respectively. The driving component is mounted on the injection molding die and extends into the flow channel to push the two valve cores away from each other to release the sealing connection with the sealing surface or to release the push on the two valve cores so that the two valve cores cooperate with the sealing surface to form a sealing connection.

[0006] In the above technical solution, further: The valve core includes a core body and an annular sealing block sleeved on the core body, and the annular sealing block is correspondingly arranged with the first annular protrusion. The two cores have spherical surfaces on the side that are close to each other.

[0007] In the above technical solution, the driving component further includes: The insert rod has guide holes adapted to the fixed template and the moving template, with one end of the guide hole penetrating the surface of the fixed template and the moving template, and the other end communicating with the flow channel. A sealing ring is fitted onto the surface of the insert rod and is used to form a seal between the insert rod and the inner wall of the guide hole; A drive cylinder is mounted on the surfaces of the fixed and moving templates and is used to push the insert rod along the guide hole to bring the two valve cores closer or further apart. The end of the insertion rod near the flow channel forms a tapered portion.

[0008] In the above technical solution, further: A cavity is formed between the fixed template and the moving template, and the cavity includes an inner area and an outer area; The outer region has at least two straight flow channels, the inner region has an even number of straight flow channels, and multiple temperature sensors are provided on the fixed template and the moving template respectively, which are used to detect the temperature of the cavity and the temperature of the outer surface of the fixed template and the moving template respectively.

[0009] This invention provides a temperature control method for rubber injection molding dies, comprising the following steps: S1: Set the target temperature for heating and cooling; S2: Introduce heat exchange medium into the straight flow channel to keep the opening and closing valves open and the opening and closing components closed; S3: The temperature sensor detects the temperature of the injection molding mold in real time, compares it with the target temperature, forms the first temperature difference, and determines whether the temperature control is abnormal. If normal, proceed to S5; if abnormal, proceed to S4. S4: Reduce the flow rate of the heat exchange medium or reduce the temperature of the heat exchange medium or adjust them simultaneously until it is normal. Then proceed to S5. If the abnormality is maintained, the machine will be shut down and an alarm will be triggered. S5: Based on the first temperature difference, adjust the opening and closing of the valve and the opening and closing parts to change the flow mode between multiple straight flow channels, and repeat S3-S5. In S3, the abnormality judgment is whether the first temperature difference is greater than 3℃. If it is, it is judged as abnormal; if not, it is judged as normal.

[0010] In the above technical solution, further, in S5: When the first temperature difference is greater than 10℃, repeat S3-S5; When 5℃ < |first temperature difference| ≤ 10℃, adjust the opening and closing of the valve and the opening and closing parts to form multiple U-shaped flow channels from all straight flow channels, and connect all U-shaped flow channels in parallel, repeating S3-S5. When the first temperature difference is ≤5℃, adjust the opening and closing of the valve and the opening and closing parts to make all straight-through channels form a single series channel, and repeat S3-S5.

[0011] In the above technical solution, further, S5 also includes: In the temperature control stage, the temperature sensor detects the temperature of the inner and outer zones in real time and compares the two to form a second temperature difference. Based on the magnitude of the second temperature difference, the flow mode of multiple straight channels corresponding to the outer zone is adjusted, or the flow rate of the heat exchange medium is adjusted, or the temperature of the heat exchange medium is adjusted, or both are adjusted simultaneously, and the temperature control method of S3-S5 is maintained. The temperature control stage includes a heating stage, a cooling stage, and a heat preservation stage.

[0012] In the above technical solution, further: When the second temperature difference is ≤2℃, maintain the temperature control method of S3-S5; When the second temperature difference value > 2℃: ①: When the second temperature difference is positive and the heating stage is in progress, adjust the straight flow channel in the outer zone to increase the flow rate of the heat exchange medium or increase the temperature of the heat exchange medium, or adjust both simultaneously. ②: When the second temperature difference is positive and the cooling stage is in progress, adjust the straight flow channel in the outer zone to form a single series flow path, reduce the flow rate of the heat exchange medium, increase the temperature of the heat exchange medium, or adjust both simultaneously. ③: When the second temperature difference is positive and the heat exchange medium is in the heat preservation stage, adjust the straight flow channel in the outer zone to form a parallel flow path, increase the flow rate of the heat exchange medium, increase the temperature of the heat exchange medium, or adjust both simultaneously. ④: When the second temperature difference is negative and the heating stage is in progress, adjust the straight flow channel in the outer zone to form a single series flow path, reduce the flow rate of the heat exchange medium, lower the temperature of the heat exchange medium, or adjust both simultaneously. ⑤: When the second temperature difference is negative and the cooling stage is in progress, adjust the straight flow channel in the outer zone to increase the flow rate of the heat exchange medium or decrease the temperature of the heat exchange medium, or adjust both simultaneously. ⑥: When the second temperature difference is negative and the heat exchange medium is in the heat preservation stage, adjust the straight flow channel in the outer zone to reduce the flow rate of the heat exchange medium or lower the temperature of the heat exchange medium, or adjust both simultaneously.

[0013] In the above technical solution, further: The S5 also includes real-time detection of the ambient temperature of the injection molding mold and a preset ambient temperature range: When the ambient temperature is within the preset ambient temperature range, maintain the temperature control method of S3-S5; When the ambient temperature is higher than the maximum value of the preset ambient temperature range: During the heating or heat preservation stage, the power of the heat exchange medium supply equipment is adjusted to reduce to the preset lower power limit. During the cooling phase, the power of the heat exchange medium supply equipment is increased to the preset power limit. When the ambient temperature is lower than the minimum value of the preset ambient temperature range: During the heating or heat preservation stage, adjust the power of the heat exchange medium supply equipment to increase to the preset power limit. During the cooling phase, the power of the heat exchange medium supply equipment is reduced to the preset lower power limit.

[0014] The beneficial effects of this invention are as follows: 1. By adjusting the opening and closing valves and components, flexible switching can be achieved. In the "parallel straight-through flow channel" state, it has efficient heat exchange and is suitable for the initial stage of heating and cooling. In the "parallel U-shaped flow channel" state, it has smooth heat exchange and is suitable for the gradual achievement of the target temperature. In the "single series flow channel" state, it has low-consumption heat exchange and is suitable for low-consumption heat preservation, covering the temperature control requirements of the entire process of rubber injection molding from heating, cooling to heat preservation. 2. The media flow direction is opposite in adjacent straight channels, which can avoid local heat accumulation or excessive local heat exchange, improve heat exchange uniformity, and, in conjunction with the alternating arrangement of the conductive channels, facilitate the switching of mold series or parallel channels without changing the flow direction of the heat exchange medium in the original channel, reducing the impact of channel state switching on heat exchange. 3. By coordinating the switching of flow channel states with the adjustment of medium parameters (flow rate and temperature), compared with the fixed flow channel relying solely on medium adjustment, the response to temperature deviations during the cooling stage is more timely, avoiding overshoot or lag. At the same time, due to the more efficient temperature adjustment, it can reduce temperature fluctuations during temperature change and improve temperature control stability. Attached Figure Description

[0015] Figure 1This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the present invention; Figure 3 This is the present invention. Figure 2 Enlarged view of point A in the middle; Figure 4 This is a flowchart of the present invention; The markings in the diagram represent: 1. Fixed template; 2. Moving template; 3. Straight flow channel; 4. On / off valve; 5. Flow channel; 6. On / off element; 60. First annular protrusion; 61. Sealing surface; 62. Valve core; 620. Core body; 621. Annular sealing block; 622. Spherical surface; 63. Spring; 64. Second annular protrusion; 65. Driving element; 650. Insert rod; 651. Guide hole; 652. Sealing ring; 653. Driving cylinder; 654. Conical part; 7. Cavity; 70. Inner area; 71. Outer area. Detailed Implementation

[0016] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0017] Example 1: This embodiment provides a rubber injection molding die, a fixed mold plate 1 and a moving mold plate 2. Both the fixed mold plate 1 and the moving mold plate 2 are provided with multiple parallel straight flow channels 3, and both ends of the straight flow channels 3 are provided with opening and closing valves 4. A connecting channel 5 is provided between each pair of adjacent straight channels 3, and an opening and closing element 6 for controlling its opening and closing is provided in the connecting channel 5. Among them, the heat exchange medium flows in opposite directions in the two adjacent straight-through channels 3, multiple conductive channels 5 are arranged alternately, and the opening and closing adjustment of the opening and closing valves 4 and the opening and closing components 6 are used to form parallel straight-through channels 3, parallel U-shaped channels or a single series channel. It also includes a controller, which is used to electrically connect with the on / off valve 4 and the on / off element 6 to control the opening and closing. These are all existing mature technologies and are routine operations for those skilled in the art, so they will not be described in detail here.

[0018] As can be seen from this embodiment, the opening and closing valve 4 and the opening and closing component 6 can be flexibly switched. In the state of "parallel straight flow channel 3", it has efficient heat exchange and is suitable for the initial stage of heating and cooling. In the state of "parallel U-shaped flow channel", it has smooth heat exchange and is suitable for the temperature to reach the target temperature smoothly. In the state of "single series flow channel", it has low heat exchange and is suitable for low heat maintenance, covering the temperature control requirements of the entire process of rubber injection molding from heating, cooling to heat preservation. The media flow direction is opposite in adjacent straight flow channels 3, which can avoid local heat accumulation or excessive local heat exchange, improve heat exchange uniformity, and, together with the alternating arrangement of the conductive flow channels 5, facilitate the switching of mold series or parallel flow channels without changing the flow direction of the heat exchange medium in the original flow channel, reducing the impact of flow channel state switching on heat exchange. By coordinating the switching of flow channel states with the adjustment of medium parameters (flow rate and temperature), compared with the method of relying solely on medium adjustment in a fixed flow channel, the response to temperature deviations during the cooling stage is more timely, avoiding overshoot or lag. At the same time, due to the more efficient temperature adjustment, it can reduce temperature fluctuations during the temperature change process and improve temperature control stability.

[0019] Example 2: This embodiment provides a rubber injection molding die, which, in addition to the technical solutions of the above embodiments, also has the following technical features, wherein the opening and closing component 6 includes: The first annular protrusion 60 is provided on the inner wall of the guide channel 5 and forms a sealing surface 61 on both sides along the axial direction; Two valve cores 62 are installed in the flow channel 5, and they respectively cooperate with the sealing surfaces 61 on both sides of the first annular protrusion 60 to form a sealed connection. Spring 63 is installed in the flow channel 5, and a second annular protrusion 64 is provided on the inner wall of the flow channel 5. The two ends of spring 63 abut against valve core 62 and the second annular protrusion 64 respectively. The drive component 65 is mounted on the injection molding die and extends into the flow channel 5 to push the two valve cores 62 away from each other to release the sealing connection with the sealing surface 61 or to release the push on the two valve cores 62 so that the two valve cores 62 cooperate with the sealing surface 61 to form a sealing connection.

[0020] As can be seen from this embodiment, by using two valve cores 62 and using the pushing and releasing of the driving component 65 to cause the two valve cores 62 to release and seal with the sealing surface 61 on the first annular protrusion 60, it is convenient to control the opening and closing of the flow channel 5. Furthermore, two valve cores 62 are used, with the first annular protrusion 60 located between the two valve cores 62. Thus, when the valve core 62 seals with the sealing surface 61, it not only relies on the elastic force provided by the spring 63, but also applies the pressure of the heat exchange medium in the mold flow channel to the valve core 62, making the valve core 62 and the sealing surface 61 more tightly contacted. This ensures the sealing effect of the two valve cores 62 at the same time, guarantees the series or parallel control of the flow channels inside the mold, and after adjustment, avoids mutual interference between two adjacent parallel flow channels, ensuring stability.

[0021] Example 3: This embodiment provides a rubber injection molding die, which, in addition to the technical solutions of the above embodiments, also has the following technical features: The valve core 62 includes a core body 620 and an annular sealing block 621 sleeved on the core body 620, and the annular sealing block 621 is correspondingly arranged with the first annular protrusion 60. Among them, the two cores 620 have a spherical surface 622 on the side that is close to each other; Meanwhile, the annular sealing block 621 is made of rubber, while the valve core 62 can be made of metal.

[0022] As can be seen from this embodiment, by using a core 620 and an annular sealing block 621 corresponding to the first annular protrusion 60 for the valve core 62, the rubber annular sealing block 621 can be pushed to abut against the first annular protrusion 60 to achieve a sealing connection during sealing. Furthermore, since the valve core 62 is pressed against the sealing surface 61 by the combined action of the spring 63 and the pressure of the heat exchange medium in the mold flow channel, that is, when the annular sealing block 621 is slightly aged after being immersed in the heat exchange medium for a long time, the aged valve core 62 will be closer to the first annular protrusion 60 under the same sealing condition. This will cause the spring 63 to be stretched axially and become longer, affecting the force of the spring 63. Therefore, the pressure of the heat exchange medium in the mold flow channel can prevent the sealing performance from declining due to the slight aging of the rubber annular sealing block 621, ensuring the contact strength between the annular sealing block 621 and the sealing surface 61, ensuring the performance of the aged seal, and thus extending the maintenance cycle and service life. By using a metal material for the core 620 and a spherical surface 622 on the side where the two valve cores 62 are close to each other, the contact area between the drive component 65 and the valve core 62 when the drive component 65 pushes the valve core 62 can be reduced, thus reducing wear during contact and extending service life.

[0023] Example 4: This embodiment provides a rubber injection molding die, which, in addition to the technical solutions of the above embodiments, also has the following technical features, wherein the driving component 65 includes: Insert rod 650, both the fixed template 1 and the moving template 2 are provided with guide holes 651 adapted to the insert rod 650, and one end of the guide hole 651 penetrates the surface of the fixed template 1 and the moving template 2, and the other end is connected to the flow channel 5; A sealing ring 652 is fitted onto the surface of the insert rod 650 and is used to form a seal between the insert rod 650 and the inner wall of the guide hole 651. A drive cylinder 653 is mounted on the surfaces of the fixed template 1 and the moving template 2, and is used to push the insert rod 650 to move along the guide hole 651 so that the two valve cores 62 move closer or further apart from each other; The insertion rod 650 has a tapered portion 654 at one end near the flow channel; Meanwhile, the insertion rod 650 is made of metal, while the sealing ring 652 is made of rubber, and the drive cylinder 653 can be a pneumatic cylinder, with a connecting plate at the output end connected to the insertion rod 650.

[0024] As can be seen from this embodiment, by using a drive rod to push the insert rod 650, the insert rod 650 moves inward along the guide block and pushes the two valve cores 62 away from each other, thereby opening the contact between the valve cores 62 and the sealing surface 61, realizing the opening of the flow channel 5, and also driving the insert rod 650 to move outward, thereby releasing the contact between the two valve cores 62, and then under the combined action of the spring 63 and the heat exchange medium pressure in the mold flow channel, the valve cores 62 and the sealing surface 61 form a sealed connection; The use of metal for the core 620 and the spherical surface 622 on the side of the two valve cores 62 that are close to each other not only reduces the sliding friction resistance when the rod 650 moves inward and contacts the two cores 620, reducing wear between them, but also reduces the occurrence of jamming. Meanwhile, the sealing ring 652 ensures the sealing performance between the insert rod 650 and the inner wall of the guide hole 651, preventing the heat exchange medium from leaking from the guide hole 651. The tapered part 654 at the end of the insert rod 650 facilitates the gradual insertion of the insert rod 650 between the two cores 620, ensuring a smooth opening effect on the flow channel 5, reducing interference with the heat exchange medium in the mold flow channel, and improving stability. Furthermore, to improve processing convenience, the fixed template 1 and the moving template 2 can be divided into two bolt-fastened parts along the axis of the straight flow channel 3 and the guide flow channel 5. Then, an installation cavity is processed on the side of these two parts that are close to each other and located at the guide flow channel 5, and an installation block is set in the installation cavity. The guide flow channel 5, the first annular protrusion 60, the second annular protrusion 64, and the end of the guide hole 651 near the valve core 62 are all set on the installation block, as shown in the attached figure. A sealing structure is provided between the two parts (not shown in the attached diagram). This is a conventional choice that those skilled in the art can make to improve the ease of processing and ensure sealing, and will not be elaborated here.

[0025] Example 5: This embodiment provides a rubber injection molding die, which, in addition to the technical solutions of the above embodiments, also has the following technical features: A cavity 7 is formed between the fixed template 1 and the moving template 2, and the cavity 7 includes an inner region 70 and an outer region 71; Among them, the number of straight flow channels 3 corresponding to the outer region 71 is at least two, the number of straight flow channels 3 corresponding to the inner region 70 is a positive even number, and multiple temperature sensors are respectively provided on the fixed template 1 and the moving template 2, which are used to detect the temperature of the cavity 7 and the temperature of the outer surface of the fixed template 1 and the moving template 2. The specific structure of the temperature sensor is based on existing mature technology, which is sufficient to obtain the temperature at the required location. This is a selection of traditional temperature sensors by those skilled in the art, and will not be elaborated here.

[0026] As can be seen from this embodiment, dividing the cavity 7 of the fixed template 1 and the moving template 2 into an inner region 70 and an outer region 71, and separately controlling the straight flow channels 3 corresponding to the inner region 70 and the outer region 71, can adapt to the regional temperature control requirements of rubber vulcanization, avoid the influence of external temperature on the outer region 71 of the mold, and avoid the temperature control contradiction of undertemperature in the outer region 71 and overtemperature in the inner region 70.

[0027] Example 6: This embodiment provides a temperature control method for rubber injection molding molds, including the following steps: S1: Set the target temperature for heating and cooling; S2: Introduce heat exchange medium into the straight flow channel 3, keeping the opening and closing valve 4 open and the opening and closing element 6 closed; S3: The temperature sensor detects the temperature of the injection molding mold in real time, compares it with the target temperature, forms the first temperature difference, and determines whether the temperature control is abnormal. If normal, proceed to S5; if abnormal, proceed to S4. S4: Reduce the flow rate of the heat exchange medium or reduce the temperature of the heat exchange medium or adjust them simultaneously until it is normal. Then proceed to S5. If the abnormality is maintained, the machine will be shut down and an alarm will be triggered. S5: Based on the first temperature difference, adjust the opening and closing of the opening and closing valve 4 and the opening and closing element 6 to change the flow mode between multiple straight flow channels 3, and repeat S3-S5. In S3, the abnormality judgment is whether the first temperature difference is greater than 3℃. If it is, it is judged as abnormal; if not, it is judged as normal. Meanwhile, the specific target temperatures for heating and cooling are selected according to different rubber products, and this application does not limit them. This is a routine operation for those skilled in the art, and will not be elaborated here. Furthermore, the first temperature difference is based on the temperature of the inner zone 70 detected in real time, that is, the first temperature difference is the difference between the temperature of the inner zone 70 and the target temperature.

[0028] As can be seen from this embodiment, efficient heat exchange is ensured by using parallel straight-through channels 3 in the early stage of temperature change, smooth heat exchange is ensured by using parallel U-shaped channels in the late stage of temperature change, and low energy consumption is ensured by using a single series channel in the heat preservation stage. The switching is flexible and adaptable to the temperature control requirements of the entire process of rubber injection molding from heating, cooling to heat preservation. The system provides feedback based on the first temperature difference obtained by comparing the actual temperature of the injection molding mold with the target temperature. This helps to determine whether the temperature control is abnormal and can also serve as a trigger condition for flow channel switching, thereby improving the accuracy of temperature control response and ensuring the stability of rubber product quality. Furthermore, in the abnormal judgment, by setting a threshold of "3℃" instead of zero deviation, combined with the tolerance range of rubber vulcanization to temperature fluctuations, we can avoid frequent triggering of abnormal responses due to small temperature differences, reduce ineffective temperature control, and reduce the mechanical wear of the opening and closing valve 4 and the opening and closing component 6. By coordinating the switching of flow channel states with the adjustment of medium parameters (flow rate and temperature), compared to the method of adjusting the medium alone in a fixed flow channel, the response to temperature deviations during the cooling stage is more timely, avoiding overshoot or lag. At the same time, due to the more efficient temperature adjustment, temperature fluctuations during the temperature change process can be reduced, and temperature control stability can be improved.

[0029] Example 7: This embodiment provides a temperature control method for rubber injection molding molds. In addition to the technical solutions of the above embodiments, it also has the following technical features, wherein in S5: When the first temperature difference is greater than 10℃, repeat S3-S5; When 5℃ < |first temperature difference| ≤ 10℃, adjust the opening and closing of the opening and closing valve 4 and the opening and closing element 6 to make all straight flow channels 3 form multiple U-shaped flow channels, and make all U-shaped flow channels in parallel, repeating S3-S5. When the first temperature difference is ≤5℃, adjust the opening and closing of the valve 4 and the opening and closing element 6 to make all the straight flow channels 3 form a single series flow channel, and repeat S3-S5.

[0030] As can be seen from this embodiment, by flexibly switching the mold flow channel state, in the state of "parallel straight flow channel 3", it has efficient heat exchange and is suitable for the initial stage of heating and cooling; in the state of "parallel U-shaped flow channel", it has smooth heat exchange and is suitable for the temperature to reach the target temperature smoothly; in the state of "single series flow channel", it has low heat exchange and is suitable for low heat maintenance, covering the temperature control requirements of the entire process of rubber injection molding from heating, cooling to heat maintenance. Furthermore, by selecting the aforementioned temperature steps, the mold flow channel state is adapted to the temperature. Setting the threshold of 10℃ for the target temperature provides sufficient switching time for smooth heat exchange. This avoids excessively long temperature change time due to an excessively high threshold, which would affect production efficiency. On the other hand, it avoids insufficient time to switch to smooth heat exchange due to an excessively low threshold, which would trigger anomaly detection and improve system stability. Setting the threshold of 5℃ for the target temperature avoids frequent switching of the mold flow channel state.

[0031] Example 8: This embodiment provides a temperature control method for rubber injection molding molds. In addition to the technical solutions described in the above embodiments, it also has the following technical features, and step S5 further includes: During the temperature control phase, the temperature sensor detects the temperature of the inner zone 70 and the outer zone 71 in real time, compares the two to form a second temperature difference, and adjusts the flow mode of the multiple straight channels 3 corresponding to the outer zone 71, or adjusts the flow rate of the heat exchange medium, or adjusts the temperature of the heat exchange medium, or adjusts them simultaneously, based on the magnitude of the second temperature difference, and maintains the temperature control method of S3-S5. The temperature control stage includes a heating stage, a cooling stage, and a heat preservation stage.

[0032] As can be seen from this embodiment, by selecting or simultaneously adjusting the flow mode of multiple straight-through channels 3 in the outer zone 71 and the flow rate and temperature of the heat exchange medium based on the magnitude of the second temperature difference during the temperature control stage, it is possible to ensure high adjustment flexibility, fast temperature response speed, and effectively avoid overshoot or lag. Furthermore, by adjusting the DC channel of the outer zone 71 while maintaining the DC channel of the inner zone 70, the temperature difference between the inner zone 70 and the outer zone 71 caused by environmental factors affecting the injection molding mold can be better addressed, thereby ensuring the temperature response speed and avoiding overshoot or lag.

[0033] Example 9: This embodiment provides a temperature control method for rubber injection molding molds, which, in addition to the technical solutions of the above embodiments, also has the following technical features: When the second temperature difference is ≤2℃, maintain the temperature control method of S3-S5; When the second temperature difference value > 2℃: ①: When the second temperature difference is positive and the heating stage is in progress, adjust the straight flow channel 3 of the outer zone 71 to increase the flow rate of the heat exchange medium or increase the temperature of the heat exchange medium, or adjust both simultaneously. ②: When the second temperature difference is positive and the cooling stage is in progress, adjust the straight flow channel 3 of the outer zone 71 to form a single series flow path, or reduce the flow rate of the heat exchange medium, or increase the temperature of the heat exchange medium, or adjust both simultaneously. ③: When the second temperature difference is positive and the heat exchange medium is in the heat preservation stage, adjust the straight flow channel 3 of the outer zone 71 to form a parallel flow path, or increase the flow rate of the heat exchange medium, or increase the temperature of the heat exchange medium, or adjust both simultaneously. ④: When the second temperature difference is negative and the heating stage is in progress, adjust the straight flow channel 3 of the outer zone 71 to form a single series flow path, reduce the flow rate of the heat exchange medium, lower the temperature of the heat exchange medium, or adjust both simultaneously. ⑤: When the second temperature difference is negative and the cooling stage is in progress, adjust the straight flow channel 3 of the outer zone 71 to increase the flow rate of the heat exchange medium, decrease the temperature of the heat exchange medium, or adjust both simultaneously. ⑥: When the second temperature difference is negative and the heat exchange medium is in the heat preservation stage, adjust the straight flow channel 3 of the outer zone 71 to reduce the flow rate of the heat exchange medium or lower the temperature of the heat exchange medium, or adjust both simultaneously. The specific methods for adjusting the flow rate and temperature of the heat exchange medium are all existing mature technologies, which have been learned by those skilled in the art from traditional heat exchange equipment, and will not be elaborated here.

[0034] As can be seen from this embodiment, by comparing and providing feedback on the second temperature difference value generated by the temperature difference between the inner side area 70 and the outer side area 71 of the mold cavity 7, it is convenient to control the mold flow channel separately. At the 2℃ threshold, the start-up is triggered, which can intervene when the temperature difference is small, ensuring the uniformity of mold temperature control. At the same time, it avoids large adjustments in the later stage, avoids the lag of adjustment, and gradually enhances the temperature adjustment for different degrees of temperature difference, which can avoid over-adjustment and avoid affecting the quality of rubber molding products. At the same time, by combining the flow mode of the mold flow channel with the flow rate and temperature adjustment of the heat exchange medium, the adjustment is highly flexible and the temperature response speed is fast, effectively avoiding overshoot or lag. Furthermore, the separate adjustment of flow rate and temperature for the straight-through channels 3 of the outer zone 71 and the inner zone 70 is achieved by setting flow regulating valves and heat exchange devices for the inner zone 70 and the outer zone 71 (not shown in the attached drawings) on the corresponding straight-through channels 3. These are all existing mature technologies and are conventional adjustment methods used by those skilled in the art. This application will not elaborate further.

[0035] Example 10: This embodiment provides a temperature control method for rubber injection molding molds, which, in addition to the technical solutions of the above embodiments, also has the following technical features: The S5 also includes real-time detection of the ambient temperature of the injection molding mold and a preset ambient temperature range: When the ambient temperature is within the preset ambient temperature range, maintain the temperature control method of S3-S5; When the ambient temperature is higher than the maximum value of the preset ambient temperature range: During the heating or heat preservation stage, the power of the heat exchange medium supply equipment is adjusted to reduce to the preset lower power limit. During the cooling phase, the power of the heat exchange medium supply equipment is increased to the preset power limit. When the ambient temperature is lower than the minimum value of the preset ambient temperature range: During the heating or heat preservation stage, adjust the power of the heat exchange medium supply equipment to increase to the preset power limit. During the cooling phase, the power of the heat exchange medium supply equipment is reduced to the preset lower power limit; The preset ambient temperature range can be adaptively adjusted according to different regions. This application does not limit this setting and is a routine operation for those skilled in the art. Meanwhile, the specific structure of the heat exchange medium supply equipment and how to adjust the power of the heat exchange medium supply equipment are existing mature technologies, which are known to those skilled in the art from traditional heat exchange medium supply equipment and usage methods, and will not be elaborated here.

[0036] As can be seen from this embodiment, by adjusting the power of the heat exchange medium supply equipment to the upper and lower limits in advance, it is easier to improve the efficiency of subsequent adjustments when the ambient temperature has a significant impact, ensuring the control effect on the temperature change of the mold and avoiding the situation where the adjustment is delayed due to the ambient temperature. Furthermore, the power regulation of the heat exchange medium supply equipment mentioned in this embodiment refers to the power regulation of the heat exchange medium supply equipment of the total straight-through flow channel 3.

[0037] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A rubber injection molding die, comprising a fixed mold plate (1) and a movable mold plate (2), characterized in that: Both the fixed template (1) and the moving template (2) are provided with multiple parallel straight channels (3), and both ends of the straight channels (3) are provided with opening and closing valves (4). A guide channel (5) is provided between each pair of adjacent straight channels (3), and an opening and closing element (6) is provided in the guide channel (5) for controlling its opening and closing. In this process, the heat exchange medium flows in opposite directions in the two adjacent straight channels (3), and multiple conductive channels (5) are arranged alternately. The opening and closing adjustment of the valve (4) and the opening and closing element (6) is used to form parallel straight channels (3), parallel U-shaped channels, or a single series channel.

2. The rubber injection molding die according to claim 1, characterized in that, The opening and closing element (6) includes: The first annular protrusion (60) is provided on the inner wall of the flow channel (5) and forms a sealing surface (61) on both sides along the axial direction. Two valve cores (62) are installed in the flow channel (5) and respectively cooperate with the sealing surfaces (61) on both sides of the first annular protrusion (60) to form a sealed connection; A spring (63) is installed in the flow channel (5), and a second annular protrusion (64) is provided on the inner wall of the flow channel (5). The two ends of the spring (63) abut against the valve core (62) and the second annular protrusion (64) respectively. The drive unit (65) is mounted on the injection molding die and is used to extend into the flow channel (5) to push the two valve cores (62) away from each other to release the sealing connection with the sealing surface (61) or to release the push on the two valve cores (62) so that the two valve cores (62) cooperate with the sealing surface (61) to form a sealing connection.

3. The rubber injection molding die according to claim 2, characterized in that: The valve core (62) includes a core body (620) and an annular sealing block (621) sleeved on the core body (620), and the annular sealing block (621) is correspondingly arranged with the first annular protrusion (60); Among them, the two cores (620) have a spherical surface (622) on the side that is close to each other.

4. The rubber injection molding die according to claim 2, characterized in that, The drive unit (65) includes: Insert rod (650), the fixed template (1) and the moving template (2) are both provided with guide holes (651) that are adapted to the insert rod (650), and one end of the guide hole (651) penetrates the surface of the fixed template (1) and the moving template (2), and the other end is connected to the flow channel (5); A sealing ring (652) is fitted onto the surface of the insert (650) and is used to form a seal between the insert (650) and the inner wall of the guide hole (651); A drive cylinder (653) is mounted on the surfaces of the fixed template (1) and the moving template (2) and is used to push the insert rod (650) to move along the guide hole (651) so that the two valve cores (62) move closer or further apart from each other; The insertion rod (650) has a tapered portion (654) at one end near the flow channel.

5. The rubber injection molding die according to claim 1, characterized in that: A cavity (7) is formed between the fixed template (1) and the moving template (2), and the cavity (7) includes an inner region (70) and an outer region (71). Among them, the number of straight flow channels (3) corresponding to the outer region (71) is at least two, the number of straight flow channels (3) corresponding to the inner region (70) is a positive even number, and multiple temperature sensors are provided on the fixed template (1) and the moving template (2) respectively, and are used to detect the temperature of the cavity (7) and the temperature of the outer surface of the fixed template (1) and the moving template (2) respectively.

6. A temperature control method applied to a rubber injection molding die according to any one of claims 1-5, characterized in that, Includes the following steps: S1: Set the target temperature for heating and cooling; S2: Introduce heat exchange medium into the straight flow channel (3) to keep the opening and closing valve (4) open and the opening and closing part (6) closed; S3: The temperature sensor detects the temperature of the injection molding mold in real time, compares it with the target temperature, forms the first temperature difference, and determines whether the temperature control is abnormal. If normal, proceed to S5; if abnormal, proceed to S4. S4: Reduce the flow rate of the heat exchange medium or reduce the temperature of the heat exchange medium or adjust them simultaneously until it is normal. Then proceed to S5. If the abnormality is maintained, the machine will be shut down and an alarm will be triggered. S5: Based on the first temperature difference, adjust the opening and closing of the valve (4) and the opening and closing element (6) to change the flow mode between multiple straight flow channels (3), and repeat S3-S5. In S3, the abnormality judgment is whether the first temperature difference is greater than 3℃. If it is, it is judged as abnormal; if not, it is judged as normal.

7. The temperature control method for rubber injection molding die according to claim 6, characterized in that, In S5: When the first temperature difference is greater than 10℃, repeat S3-S5; When 5℃ < |first temperature difference| ≤ 10℃, adjust the opening and closing of the opening and closing valve (4) and the opening and closing part (6) to make all straight flow channels (3) form multiple U-shaped flow channels and make all U-shaped flow channels in parallel, repeating S3-S5; When the first temperature difference is ≤5℃, adjust the opening and closing of the valve (4) and the opening and closing element (6) so that all straight flow channels (3) form a single series flow channel, and repeat S3-S5.

8. The temperature control method for rubber injection molding die according to claim 6, characterized in that, S5 also includes: During the temperature control phase, the temperature sensor detects the temperature of the inner zone (70) and the outer zone (71) in real time, compares the two to form a second temperature difference, and adjusts the flow mode of the multiple straight channels (3) corresponding to the outer zone (71) or adjusts the heat exchange medium flow rate or adjusts the heat exchange medium temperature or adjusts them simultaneously based on the magnitude of the second temperature difference, and maintains the temperature control method of S3-S5. The temperature control stage includes a heating stage, a cooling stage, and a heat preservation stage.

9. The temperature control method for rubber injection molding die according to claim 8, characterized in that: When the second temperature difference is ≤2℃, maintain the temperature control method of S3-S5; When the second temperature difference value > 2℃: ①: When the second temperature difference is positive and the heating stage is in progress, adjust the straight flow channel (3) of the outer zone (71) to increase the flow rate of the heat exchange medium or increase the temperature of the heat exchange medium or adjust it at the same time. ②: When the second temperature difference is positive and the cooling stage is in progress, adjust the straight flow channel (3) of the outer zone (71) to form a single series flow path, or reduce the flow rate of the heat exchange medium, or increase the temperature of the heat exchange medium, or adjust both simultaneously. ③: When the second temperature difference is positive and the heat exchange medium is in the heat preservation stage, adjust the straight flow channel (3) of the outer zone (71) to form a parallel flow path, or increase the flow rate of the heat exchange medium, or increase the temperature of the heat exchange medium, or adjust it at the same time. ④: When the second temperature difference is negative and the heating stage is in progress, adjust the straight flow channel (3) of the outer zone (71) to form a single series flow path, or reduce the flow rate of the heat exchange medium, or lower the temperature of the heat exchange medium, or adjust both simultaneously. ⑤: When the second temperature difference is negative and the cooling stage is in progress, adjust the straight flow channel (3) of the outer zone (71) to increase the flow rate of the heat exchange medium or decrease the temperature of the heat exchange medium or adjust both simultaneously. ⑥: When the second temperature difference is negative and the heat exchange medium is in the heat preservation stage, adjust the straight flow channel (3) of the outer zone (71) to reduce the flow rate of the heat exchange medium or lower the temperature of the heat exchange medium or adjust it at the same time.

10. The temperature control method for rubber injection molding die according to claim 8, characterized in that: The S5 also includes real-time detection of the ambient temperature of the injection molding mold and a preset ambient temperature range: When the ambient temperature is within the preset ambient temperature range, maintain the temperature control method of S3-S5; When the ambient temperature is higher than the maximum value of the preset ambient temperature range: During the heating or heat preservation stage, the power of the heat exchange medium supply equipment is adjusted to reduce to the preset lower power limit. During the cooling phase, the power of the heat exchange medium supply equipment is increased to the preset power limit. When the ambient temperature is lower than the minimum value of the preset ambient temperature range: During the heating or heat preservation stage, adjust the power of the heat exchange medium supply equipment to increase to the preset power limit. During the cooling phase, the power of the heat exchange medium supply equipment is reduced to the preset lower power limit.

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