A mold structure for multi-cavity synchronous injection molding

Abstract

The utility model provides a kind of mould structure of multiple cavity synchronous injection molding, it is related to injection mold technical field, including exhaust groove, one end of the exhaust groove is provided with air-tight block, air-tight block signal is connected with microprocessor, the air pressure sensor for detecting the air pressure inside injection molding cavity is connected with microprocessor signal.The utility model has the advantages that: the exhaust groove that is communicated with cavity is arranged inside the cavity plate of multiple cavity synchronous injection molding mould, and air-tight block for adjusting the exhaust area is arranged in the inside of exhaust groove, the position of air-tight block can be adjusted according to the difference value of air pressure in each cavity detected by cavity internal air pressure sensor, the area of corresponding exhaust groove is adjusted according to the air pressure inside each cavity, and then the adjustment of exhaust efficiency is realized, to ensure that each cavity can complete the exhaust of same time under different air pressure, improve the relative stability of exhaust inside each cavity, improve the stability of multiple cavity injection molding.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, and in particular to a mold structure for simultaneous injection molding of multiple cavities. Background Technology

[0002] With the rapid development of the plastics industry and the widespread application of plastic products in industries such as aviation, aerospace, electronics, machinery, shipbuilding, and automobiles, the proportion of plastic molds in the total number of molds is gradually increasing, and the requirements for plastic molds are also becoming more stringent. Injection molds, as an important process equipment for plastic products, have become the most common molding method in plastics. Multi-cavity synchronous injection molding mold structures, by setting multiple identical cavities in a single mold set, enable the molding of multiple products in a single injection, greatly improving production efficiency and reducing production costs. Therefore, they have been widely used in the plastics processing industry.

[0003] However, the existing multi-cavity synchronous injection molding mold structure requires the air in the cavity to be discharged in time during injection, which makes it inconvenient to detect the air pressure inside each cavity in real time and to adjust the venting efficiency of each cavity according to different air pressures. Utility Model Content

[0004] Therefore, the purpose of this utility model is to propose a mold structure for multi-cavity synchronous injection molding, so as to solve the problems mentioned in the background art and overcome the shortcomings of the existing technology.

[0005] To achieve the above objectives, one embodiment of this utility model provides a mold structure for multi-cavity synchronous injection molding, including an upper mold base and a lower mold base for support and fixation. A cavity plate with multiple cavities is fixedly installed inside the lower mold base. A core, fixedly installed above the cavity plate and corresponding to the upper mold base, is provided. A flow channel for guiding injection material is provided inside the core. Several venting grooves corresponding to the cavities are provided inside the cavity plate. An airtight block for adjusting the size of each venting groove is provided at one end. The airtight block is signal-connected to a microprocessor (STM32F103C8T6) for signal processing and automated control. The microprocessor is signal-connected to a pressure sensor for detecting the air pressure inside the injection cavity. One end of the venting groove is connected to an air passage for guiding air. An venting seat for venting protection is provided at one end of the air passage. An airtight connecting seat for sealing the air passage is fixedly installed inside the venting seat. An auxiliary venting pump for auxiliary venting is fixedly installed at one end of the airtight connecting seat.

[0006] Preferably, the lower mold base has an internal mounting groove for fixing the cavity plate, and an airtight layer is provided between the lower mold base and the cavity plate for sealing. The venting groove is configured as an inverted L-shaped structure, and one end of the venting groove has a movable groove located inside the cavity plate. The structural design of the venting groove is consistent with common mold cavity venting structures, which can effectively prevent raw material intrusion and ensure the stability of venting and injection molding.

[0007] The above technical solution is adopted as follows: the lower mold base (made of P20 mold steel) has an installation groove, the airtight layer (made of fluororubber) is set between the lower mold base and the cavity plate, the venting groove is set in the cavity plate, and a movable groove is set at one end to adapt to the airtight block. The installation groove ensures the precise positioning of the cavity plate and ensures the accuracy of simultaneous injection molding of multiple cavities. The fluororubber airtight layer has excellent sealing performance to prevent leakage of injection molding materials. The inverted L-shaped venting groove avoids the material from entering the venting channel. The movable groove provides adjustment space for the airtight block to achieve the adaptation of venting efficiency.

[0008] Preferably, in any of the above embodiments, the airtight block includes an electric telescopic rod that provides driving force and a sealing block that allows for movable adjustment. The electric telescopic rod is fixedly installed inside the cavity plate, and a sealing block that moves inside the cavity plate is fixedly installed at one end of the electric telescopic rod.

[0009] The above technical solution is adopted: the electric telescopic rod (mini electric push rod) of the airtight block drives the sealing block (made of stainless steel). The sealing block moves along the movable groove, adjusting the effective exhaust width of the exhaust groove. The electric telescopic rod realizes the precise displacement of the sealing block, dynamically adjusts the exhaust area of ​​the exhaust groove, adapts to the air pressure requirements of different cavities, and the stainless steel sealing block is wear-resistant and corrosion-resistant, and does not deform after long-term use. By adjusting the exhaust area, the exhaust rate is controlled to ensure the air pressure balance of multiple cavities.

[0010] Preferably, in any of the above embodiments, the pressure sensor is fixedly installed inside the cavity of the cavity plate, and the pressure sensor is located on one side of the exhaust groove.

[0011] The above technical solution involves fixing piezoelectric pressure sensors inside each cavity to detect cavity pressure in real time and transmitting the data to a microprocessor. Each cavity is equipped with an independent pressure sensor to accurately capture pressure changes in each cavity, providing data support for exhaust adjustment. The sensors respond quickly and can provide real-time feedback on pressure fluctuations during injection molding. Based on the detection data, the exhaust is dynamically adjusted to avoid uneven pressure caused by cavity differences and ensure consistent product molding quality.

[0012] Preferably, in any of the above embodiments, the air passage includes a built-in air groove for gas transmission and an external air groove for gas discharge. The built-in air groove is located inside the cavity plate and is connected to the exhaust groove. One end of the built-in air groove is connected to the external air groove located inside the lower mold base.

[0013] The above technical solution is adopted as follows: the built-in air groove (opened in the cavity plate) of the air passage connects the exhaust groove and the external air groove, and the external air groove (opened in the lower mold base) connects the exhaust seat. The air passage is in the form of an "L-shaped + straight line" combination to realize the directional transmission of gas. The built-in air groove connects the exhaust groove of each cavity with the external air groove to form a unified exhaust channel. The external air groove provides the main channel for gas discharge and avoids gas stagnation. The air passage size design ensures smooth gas flow and does not affect exhaust efficiency. The overall structure realizes the centralized discharge of gas from multiple cavities, which is convenient for subsequent auxiliary exhaust and protection.

[0014] Preferably, in any of the above solutions, the vent seat is fixedly installed at one end of the lower mold base, and one end of the vent seat has an opening that communicates with the external air groove for ventilation.

[0015] The above technical solution is adopted: the exhaust seat (aluminum alloy material) is fixed to one end of the lower mold base, and the notch is precisely connected with the external air groove to form a gas exhaust outlet. The exhaust seat provides an installation benchmark for the airtight connection seat and the auxiliary exhaust pump. The aluminum alloy exhaust seat is lightweight and rigid, and does not increase the overall load of the mold. The precise connection between the notch and the external air groove ensures that there is no gas leakage, provides a stable installation platform for the subsequent auxiliary exhaust components, and ensures the working stability of the auxiliary exhaust pump 9. The overall structure realizes the end convergence and protection of the exhaust channel.

[0016] Preferably, in any of the above embodiments, the airtight connection seat includes a pneumatic telescopic rod for driving and a movable air seat for guiding air. The pneumatic telescopic rod is fixedly installed inside the exhaust seat. One end of the pneumatic telescopic rod is fixedly installed with a movable air seat that moves inside the exhaust seat. One end of the movable air seat is fixedly installed with an auxiliary exhaust pump that moves inside the exhaust seat.

[0017] The above technical solution is adopted as follows: the pneumatic telescopic rod (mini cylinder) of the airtight connecting seat drives the movable air seat (rubber material), the auxiliary exhaust pump (micro vacuum pump) is fixed to the movable air seat to realize auxiliary negative pressure exhaust, the pneumatic telescopic rod drives the movable air seat to rise and fall, realizes the sealed docking of the auxiliary exhaust pump and the notch, the rubber movable air seat flexibly fits to avoid damage from hard contact, the auxiliary exhaust pump forms negative pressure in the air passage to accelerate the exhaust of multi-cavity gas, which is especially suitable for the gas exhaust of complex cavities.

[0018] Compared with the prior art, the advantages and beneficial effects of this utility model are as follows: 1. An venting groove connected to the cavity is set inside the cavity plate of the multi-cavity synchronous injection mold. An airtight block is set inside the venting groove to adjust its venting area. The position of the airtight block can be adjusted according to the pressure difference detected by the air pressure sensor in each cavity. The area of ​​the corresponding venting groove is adjusted according to the air pressure in each cavity, thereby realizing the adjustment of venting efficiency. This ensures that each cavity can complete venting in the same amount of time under different air pressures, improves the relative stability of venting in each cavity, and improves the stability of multi-cavity injection molding.

[0019] 2. An air passage connected to the venting groove is set inside the cavity plate and the lower mold base. The gas inside the cavity is discharged through the air passage. An airtight connecting seat that can be extended and adjusted is set on one side of the air passage. The position of the airtight connecting seat can be controlled according to the venting needs. A negative pressure is formed inside the air passage by an auxiliary venting pump to assist venting and improve the venting efficiency.

[0020] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0021] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is an exploded structural diagram according to an embodiment of the present utility model. Figure 2 According to the embodiments of this utility model Figure 1 Enlarged structural diagram at point A in the middle. Figure 3 This is a cross-sectional structural diagram of the lower mold base according to an embodiment of the present utility model. Figure 4 According to the embodiments of this utility model Figure 3 Enlarged structural diagram at point B; Figure 5 This is a cross-sectional structural diagram of the airway according to an embodiment of the present invention; Figure 6 According to the embodiments of this utility model Figure 5 A magnified structural diagram at point C. Among them: 1-lower mold base, 2-cavity plate, 3-venting groove, 4-airtight block, 41-electric telescopic rod, 42-sealing block, 5-pressure sensor, 6-air passage, 61-built-in air groove, 62-external air groove, 7-venting seat, 8-airtight connecting seat, 81-pneumatic telescopic rod, 82-movable air seat, 9-auxiliary venting pump. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited to the following description.

[0023] like Figure 1-6 As shown in the figure, a multi-cavity synchronous injection molding mold structure of this utility model includes an upper mold base and a lower mold base 1 for support and fixation. A cavity plate 2 with multiple cavities is fixedly installed inside the lower mold base 1. A core fixedly installed above the cavity plate 2 and fixedly installed with the upper mold base is provided. The core has a flow channel for guiding injection material. A plurality of venting grooves 3 corresponding to the cavities are provided inside the cavity plate 2. An airtight block 4 for adjusting the size of the venting groove 3 is provided at one end. The airtight block 4 is signal-connected to a microprocessor for signal processing and automatic control. The microprocessor is signal-connected to a pressure sensor 5 for detecting the air pressure inside the injection cavity. One end of the venting groove 3 is connected to an air passage 6 for guiding air. An venting seat 7 for venting protection is provided at one end of the air passage 6. An airtight connecting seat 8 for sealing the air passage 6 is fixedly installed inside the venting seat 7. An auxiliary venting pump 9 for auxiliary venting is fixedly installed at one end of the airtight connecting seat 8.

[0024] Preferably, the lower mold base 1 has an internal mounting groove for fixing the cavity plate 2, and an airtight layer is provided between the lower mold base 1 and the cavity plate 2 for sealing. The venting groove 3 is configured as an inverted L-shaped structure, and one end of the venting groove 3 has an movable groove located inside the cavity plate 2. The structural design of the venting groove 3 is consistent with the common mold cavity venting structure, which can effectively prevent raw material intrusion and ensure the stability of venting and injection molding.

[0025] The above technical solution is adopted as follows: the lower mold base 1 (made of P20 mold steel) has an installation groove, the airtight layer (made of fluororubber) is set between the lower mold base and the cavity plate 2, the venting groove 3 is set in the cavity plate 2, and one end is provided with a movable groove to adapt to the airtight block 4. The installation groove ensures the precise positioning of the cavity plate 2 and ensures the accuracy of simultaneous injection molding of multiple cavities. The fluororubber airtight layer has excellent sealing performance and prevents leakage of injection molding materials. The inverted L-shaped venting groove 3 avoids the material from entering the venting channel. The movable groove provides adjustment space for the airtight block 4 to achieve the adaptation of venting efficiency.

[0026] The dimensional accuracy of the mounting groove ensures the fitting accuracy between the cavity plate and the core. The sealing and protection principle is based on the elastic deformation of fluororubber, which fills the gaps to block leakage. The overflow and venting principle is based on the synergy of gravity and air pressure of the L-shaped structure to avoid material backflow. The space adaptation principle is based on the movable groove, which provides installation and movement space for the venting adjustment structure. The cavity plate 2 is installed in the mounting groove of the lower mold base 1, and the airtight layer fits and seals. During injection molding, the air in the cavity is discharged through the inverted L-shaped venting groove 3. The airtight block 4 in the movable groove adjusts the venting area according to the air pressure. After injection molding, the residual impurities in the venting groove are cleaned, and the aging of the airtight layer and the dimensional accuracy of the mounting groove are checked regularly.

[0027] Preferably, in any of the above embodiments, the airtight block 4 includes an electric telescopic rod 41 that provides driving force and a sealing block 42 that allows for adjustment. The electric telescopic rod 41 is fixedly installed inside the cavity plate 2, and one end of the electric telescopic rod 41 is fixedly installed with the sealing block 42 that moves inside the cavity plate 2.

[0028] The above technical solution is adopted: the electric telescopic rod 41 (mini electric push rod) of the airtight block 4 drives the sealing block 42 (stainless steel material), the sealing block 42 moves along the movable groove, adjusts the effective exhaust width of the exhaust groove 3, the electric telescopic rod 41 realizes the precise displacement of the sealing block 42, dynamically adjusts the exhaust area of ​​the exhaust groove 3, adapts to the air pressure requirements of different cavities, the stainless steel sealing block 42 is wear-resistant and corrosion-resistant, and does not deform after long-term use. By adjusting the exhaust area, the exhaust rate is controlled to ensure the air pressure balance of multiple cavities.

[0029] The closed-loop control of the electric telescopic rod achieves high-precision positioning of the sealing block. The exhaust adjustment principle is based on the proportion of the sealing block's obstruction of the exhaust groove, changing the effective exhaust cross-sectional area. The wear-resistant adaptation principle is based on the mechanical properties of stainless steel, adapting to the high-temperature and high-pressure environment of injection molding. The microprocessor receives the detection data from the air pressure sensor 5 and controls the extension and retraction of the electric telescopic rod 41, which drives the sealing block 42 to move. When the air pressure is too high, the sealing block 42 retracts to increase the exhaust area and accelerate exhaust. When the air pressure is too low, the sealing block 42 moves forward to reduce the exhaust area and prevent material overflow. The positioning accuracy of the telescopic rod is tested regularly, and the surface of the sealing block is cleaned regularly (no material residue).

[0030] Preferably, in any of the above schemes, the pressure sensor 5 is fixedly installed inside the cavity of the cavity plate 2, and the pressure sensor 5 is located on one side of the exhaust groove 3.

[0031] The above technical solution is adopted: the piezoelectric air pressure sensor 5 is fixed inside each cavity to detect the air pressure in the cavity in real time. The data is transmitted to the microprocessor. Each cavity is equipped with an independent air pressure sensor 5 to accurately capture the air pressure changes in each cavity, providing data support for exhaust adjustment. The sensor responds quickly and can provide real-time feedback on air pressure fluctuations during injection molding. Based on the detection data, the exhaust is dynamically adjusted to avoid uneven air pressure caused by differences in cavities and ensure the consistency of product molding quality.

[0032] The sensor converts the internal air pressure of the mold cavity into an electrical signal. The real-time monitoring principle is based on a high detection frequency to capture dynamic changes in air pressure. The data feedback principle is based on signal interaction with the microprocessor to form a closed-loop regulation. After injection begins, the air pressure sensor 5 collects the air pressure data of the mold cavity in real time and transmits it to the microprocessor. The microprocessor compares the air pressure values ​​of each mold cavity, calculates the adjustment difference, and controls the electric telescopic rod 41 of the corresponding airtight block 4 to adjust the exhaust efficiency. After injection ends, the sensor continues to monitor until the air pressure returns to normal. The sensor accuracy is calibrated regularly, and the temperature and pressure resistance performance of the sensor is tested regularly. The sensor data is transmitted to the microprocessor through the ADC interface. The microprocessor sets the air pressure threshold. When the threshold is exceeded, exhaust regulation is triggered. A digital filtering algorithm is used to process the data to reduce injection vibration interference.

[0033] Preferably, in any of the above schemes, the air passage 6 includes an internal air groove 61 for gas transmission and an external air groove 62 for gas discharge. The internal air groove 61 is opened inside the cavity plate 2 and is connected to the exhaust groove 3. One end of the internal air groove 61 is connected to the external air groove 62 opened inside the lower mold base 1.

[0034] The above technical solution is adopted: the built-in air groove 61 of the air passage 6 (opened in the cavity plate 2) connects the exhaust groove 3 and the external air groove 62. The external air groove 62 (opened in the lower mold base 1) connects the exhaust seat 7. The air passage 6 is in the form of an "L-shaped + straight line" combination to realize the directional transmission of gas. The built-in air groove 61 connects the exhaust groove 3 of each cavity with the external air groove 62 to form a unified exhaust channel. The external air groove 62 provides the main channel for gas discharge to avoid gas stagnation. The air passage size design ensures smooth gas flow and does not affect exhaust efficiency. The overall structure realizes the centralized discharge of gas from multiple cavities, which is convenient for subsequent auxiliary exhaust and protection.

[0035] The airway path design guides the directional flow of gas. The centralized exhaust principle is based on the combined design of multiple cavity airways, which simplifies the exhaust structure. The low-resistance transmission principle is based on the matching of the cross-sectional area and length of the airway, which reduces the gas flow resistance. The air in the cavity enters the built-in airway 61 through the exhaust groove 3, and after being collected, flows into the external airway 62, and is finally discharged through the exhaust seat 7. When the auxiliary exhaust pump 9 is started, a negative pressure is formed in the airway 6, which accelerates the gas flow. The airway is cleaned regularly (to prevent impurities from clogging it) and the airway size is checked regularly.

[0036] Preferably, in any of the above schemes, the vent seat 7 is fixedly installed at one end of the lower mold base 1, and one end of the vent seat 7 has an opening that communicates with the external air groove 62 for ventilation.

[0037] The above technical solution is adopted: the exhaust seat 7 (aluminum alloy material) is fixed to one end of the lower mold base 1, and the notch is precisely connected with the external air groove 62 to form a gas exhaust outlet. The exhaust seat 7 provides an installation benchmark for the airtight connection seat 8 and the auxiliary exhaust pump 9. The aluminum alloy exhaust seat is lightweight and rigid, and does not increase the overall load of the mold. The precise connection between the notch and the external air groove 62 ensures that there is no gas leakage, provides a stable installation platform for the subsequent auxiliary exhaust components, and ensures the working stability of the auxiliary exhaust pump 9. The overall structure realizes the end convergence and protection of the exhaust channel.

[0038] The aluminum alloy material balances structural strength and weight. The precise docking principle is based on the size matching of the notch and the external air groove to ensure smooth gas transmission. The installation benchmark principle is based on the flatness and verticality of the exhaust seat to ensure the installation accuracy of subsequent components. The exhaust seat 7 is fixed to the lower mold base 1 with bolts. The notch and the external air groove 62 are aligned and fit together. Gas flows into the notch through the external air groove 62 and then enters the auxiliary exhaust pump 9 through the airtight connecting seat 8. During the injection molding process, the exhaust seat 7 continuously bears the auxiliary exhaust component to maintain structural stability. The exhaust seat fixing bolts are checked regularly (no loosening) and the notch is cleaned regularly (no impurities accumulate).

[0039] Preferably, in any of the above embodiments, the airtight connection seat 8 includes a pneumatic telescopic rod 81 for driving and a movable air seat 82 for guiding air. The pneumatic telescopic rod 81 is fixedly installed inside the exhaust seat 7. One end of the pneumatic telescopic rod 81 is fixedly installed with the movable air seat 82 that moves inside the exhaust seat 7. One end of the movable air seat 82 is fixedly installed with an auxiliary exhaust pump 9 that moves inside the exhaust seat 7.

[0040] The above technical solution is adopted: the pneumatic telescopic rod 81 (mini cylinder) of the airtight connecting seat 8 drives the movable air seat 82 (rubber material), and the auxiliary exhaust pump 9 (micro vacuum pump) is fixed to the movable air seat 82 to realize auxiliary negative pressure exhaust. The pneumatic telescopic rod 81 drives the movable air seat 82 to rise and fall, realizing the sealed docking of the auxiliary exhaust pump 9 with the notch. The rubber movable air seat 82 is flexibly fitted to avoid damage from hard contact. The auxiliary exhaust pump 9 forms negative pressure in the air passage 6 to accelerate the exhaust of multi-cavity gas, which is especially suitable for the gas exhaust of complex cavities.

[0041] The cylinder achieves rapid positioning of the movable air seat through compressed air. The sealing and docking principle is based on the elastic deformation of rubber material to fill the docking gap. The negative pressure exhaust principle is based on the vacuum adsorption of the auxiliary exhaust pump to reduce the air pressure in the air passage and accelerate the gas flow. The microprocessor controls the pneumatic telescopic rod 81 to extend, causing the movable air seat 82 to fit and seal with the notch of the exhaust seat 7. The auxiliary exhaust pump 9 is started to form negative pressure in the air passage 6. After injection molding is completed, the exhaust pump is turned off, the pneumatic telescopic rod 81 retracts, and the movable air seat 82 resets. The air tightness of the cylinder and the vacuum degree of the exhaust pump are tested regularly, and the surface of the movable air seat is cleaned regularly (to ensure no impurities adhere).

[0042] The working principle of the multi-cavity synchronous injection molding mold structure of this utility model is as follows: The lower mold base 1 fixes the cavity plate 2 through the mounting groove. The fluororubber airtight layer between the two is sealed to prevent leakage. During injection molding, the flow channel of the upper mold base core injects raw material into the multiple cavities of the cavity plate 2. The air in the cavity is discharged through the inverted L-shaped exhaust groove 3 to initially balance the air pressure. After the microprocessor is started, the air pressure sensor 5 inside each cavity collects air pressure data in real time. If the air pressure of a certain cavity is higher than the threshold, the microprocessor controls the electric telescopic rod 41 of the corresponding airtight block 4 to drive the sealing block 42 to move backward, increase the effective area of ​​the exhaust groove 3 and accelerate the exhaust. If the air pressure is too low, the sealing block is controlled to move forward to reduce the area and avoid raw material overflow. Air enters the built-in air groove 61 of the cavity plate 2 through the exhaust groove 3, and flows into the external air groove 62 of the lower mold base 1 after being collected. Finally, it is guided to the exhaust seat 7. When the overall air pressure of the multi-cavity is too high, the microprocessor controls the pneumatic telescopic rod 81 in the exhaust seat 7 to drive the movable air seat 82 to fit the notch, start the auxiliary exhaust pump 9 to form negative pressure in the air passage 6, and accelerate the gas discharge. After the injection molding is completed, the exhaust pump stops, and each structure is reset, realizing the dynamic balance of air pressure in the multi-cavity and synchronous and efficient exhaust, ensuring consistent product molding quality.

[0043] Compared with the prior art, the present invention has the following advantages: 1. An venting groove 3 connected to the cavity is set inside the cavity plate 2 of the multi-cavity synchronous injection mold, and an airtight block 4 is set inside the venting groove 3 to adjust its venting area. The position of the airtight block 4 can be adjusted according to the air pressure difference detected by the air pressure sensor 5 inside the cavity, and the area of ​​the corresponding venting groove 3 can be adjusted according to the air pressure inside each cavity, thereby realizing the adjustment of venting efficiency, ensuring that each cavity can complete venting in the same time under different air pressures, improving the relative stability of venting inside each cavity, and improving the stability of multi-cavity injection molding.

[0044] 2. An air passage 6 connected to the venting groove 3 is provided inside the cavity plate 2 and the lower mold base 1. The gas inside the cavity is discharged through the air passage 6. An airtight connecting seat 8 that can be extended and adjusted is provided on one side of the air passage 6. The position of the airtight connecting seat 8 can be controlled according to the venting needs. A negative pressure is formed inside the air passage 6 by the auxiliary venting pump 9 to assist venting and improve the venting efficiency.

Claims

1. A mold structure for multi-cavity synchronous injection molding, comprising an upper mold base and a lower mold base (1) for support and fixation, wherein a cavity plate (2) with multiple cavities is fixedly installed inside the lower mold base (1), a core is correspondingly provided above the cavity plate (2) and fixedly installed with the upper mold base, the core has a flow channel for guiding injection material inside, and the cavity plate (2) has a plurality of venting grooves (3) corresponding to the cavities inside, characterized in that: One end of the exhaust groove (3) is provided with an airtight block (4) for adjusting its size. The airtight block (4) is connected to a microprocessor for signal processing and automatic control. The microprocessor is connected to a pressure sensor (5) for detecting the air pressure inside the injection molding cavity. One end of the exhaust groove (3) is connected to an air passage (6) for guiding air. One end of the air passage (6) is provided with an exhaust seat (7) for exhaust protection. An airtight connecting seat (8) for sealing the air passage (6) is fixedly installed inside the exhaust seat (7). An auxiliary exhaust pump (9) for auxiliary exhaust is fixedly installed at one end of the airtight connecting seat (8).

2. The mold structure for multi-cavity synchronous injection molding as described in claim 1, characterized in that: The lower mold base (1) has an installation groove for fixing the cavity plate (2) inside. An airtight layer is provided between the lower mold base (1) and the cavity plate (2) for sealing. The exhaust groove (3) is configured as an inverted L-shaped structure. One end of the exhaust groove (3) has an movable groove located inside the cavity plate (2).

3. The mold structure for multi-cavity synchronous injection molding as described in claim 2, characterized in that: The airtight block (4) includes an electric telescopic rod (41) that provides driving force and a sealing block (42) that allows for adjustment. The electric telescopic rod (41) is fixedly installed inside the cavity plate (2), and a sealing block (42) that moves inside the cavity plate (2) is fixedly installed at one end of the electric telescopic rod (41).

4. The mold structure for multi-cavity synchronous injection molding as described in claim 3, characterized in that: The pressure sensor (5) is fixedly installed inside the cavity of the cavity plate (2), and the pressure sensor (5) is located on one side of the exhaust groove (3).

5. The mold structure for multi-cavity synchronous injection molding as described in claim 4, characterized in that: The air passage (6) includes an internal air groove (61) for gas transmission and an external air groove (62) for gas discharge. The internal air groove (61) is located inside the cavity plate (2) and is connected to the exhaust groove (3). One end of the internal air groove (61) is connected to the external air groove (62) located inside the lower mold base (1).

6. The mold structure for multi-cavity synchronous injection molding as described in claim 5, characterized in that: The exhaust seat (7) is fixedly installed at one end of the lower mold base (1), and one end of the exhaust seat (7) has an opening that communicates with the external air groove (62) for ventilation.

7. The mold structure for multi-cavity synchronous injection molding as described in claim 6, characterized in that: The airtight connection seat (8) includes a pneumatic telescopic rod (81) for driving and a movable air seat (82) for guiding air. The pneumatic telescopic rod (81) is fixedly installed inside the exhaust seat (7). One end of the pneumatic telescopic rod (81) is fixedly installed with a movable air seat (82) that moves inside the exhaust seat (7). One end of the movable air seat (82) is fixedly installed with an auxiliary exhaust pump (9) that moves inside the exhaust seat (7).

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