A lower mold structure for compression molding with high cooling efficiency

Abstract

The utility model discloses a lower mould structure for compression moulding with high cooling efficiency, including cavity mounting sleeve, lower mould gasket, lower mould cooling cavity, the lower mould cooling cavity includes cooling outer cavity, the cooling inner cavity is sleeved in cooling outer cavity, wherein, the cooling outer cavity is clamped between the upper end of cavity mounting sleeve and lower mould gasket and the lateral wall of this cooling outer cavity is provided with a plurality of outer cavity passageways, the lower surface of cooling inner cavity is provided with a plurality of horizontal channels and the outside of this cooling inner cavity is provided with a plurality of longitudinal channels, one end of horizontal channel is cooling liquid inlet and the other end of this horizontal channel is communicated with longitudinal channel, outer cavity passageway in proper order, be provided with upper die pressure surface on cooling outer cavity, when closing mould, the upper die pressure surface is in axial direction and is in contact with upper die. The utility model can consider rustproof performance and strength and heat treatment process performance when making, can also effectively guarantee cooling liquid flow along the specified route to improve the cooling efficiency.

Description

Technical Field

[0001] This utility model relates to the field of molded product manufacturing technology, and in particular to a compression molding lower mold structure with high cooling efficiency. Background Technology

[0002] With economic development, large domestic beverage companies are increasingly demanding bottle cap production lines with high-speed, high-efficiency, and high-stability production capabilities. Traditional bottle cap production involves injection molding, but this process is suitable for producing complex-shaped products. For simple, thin-walled, multi-cavity products, traditional injection molding offers limited advantages. In contrast, compression molding offers advantages such as ease of operation, easier mold changes, lower temperatures, lower overall energy consumption, no injection port, lower shrinkage coefficient compared to injection molding, greater dimensional accuracy, and better appearance quality. Therefore, compression molding is increasingly widely used in the field of simple, thin-walled products. Correspondingly, with the development of compression molding technology, manufacturers are placing increasingly higher demands on the production stability and efficiency of compression molding equipment.

[0003] To improve the production efficiency of compression molding equipment, it is necessary to shorten the product molding cycle. Existing compression molding equipment uses molds to shape products. When the mold receives the rubber granules, the upper and lower molds need to be closed quickly initially. As the mold closes, the load resistance increases due to the presence of the internal rubber material. At this point, the actuator needs to provide a large closing force, continuously applying high pressure to the internal rubber material at a slower speed to mold it. Simultaneously, the material cools rapidly under this high pressure. Only after the product has cooled and solidified can the mold be opened and the process moved to the next station. Therefore, the main limitation of the compression molding process's molding cycle is product cooling. This necessitates rapidly improving the mold's cooling efficiency, placing higher demands on the structural rigidity of the equipment, the precision of its components, and the cooling process itself, especially regarding the cooling of the compressed product.

[0004] The common structure of existing compression molding dies is as follows: Figure 1As shown, the mold includes an upper mold 500 and a lower mold 200. When the mold is closed, the lower part of the upper mold 500 is contained within the lower mold 200, and the gap between the upper mold 500 and the lower mold 200 is the space for the molded product 600 to be produced. The lower mold 200 includes a locking end cap 1, a lower mold water distribution block 2, a lower mold washer 4, a lower mold steel sleeve 6, a lower mold cover surface 5, and a lower mold cavity 7, which are sequentially fitted together. It also includes a cavity mounting sleeve 3, the upper and lower ends of which are respectively fitted to the lower mold cavity 7 and the locking end cap 1. The lower mold cavity 7 and the lower mold steel sleeve 6 are sandwiched from top to bottom between the upper end of the cavity mounting sleeve 3 and the lower mold washer 4. The lower mold water distribution block 2 is provided with a water distribution block center channel 201, a water distribution block top surface channel 202, and a water distribution block inclined channel 203. The cavity mounting sleeve 3 is provided with an annular mounting sleeve channel 301. The lower mold washer 4 is provided with a washer channel 401. The lower mold cover surface 5 is provided with a cover surface channel 501. The lower mold steel sleeve 6 is provided with an annular steel sleeve channel 601. The lower mold cavity 7 is provided with an annular cavity channel 701. During mold closing, the lower mold 200 is fixed to the mold closing piston rod (not shown) by the locking nut 1 and moves towards the upper mold 500 with the mold closing piston rod until the molded product 600 is pressed between the lower mold 200 and the upper mold 500. At this time, the coolant is transported from the water inlet pipe of the compression molding equipment to the center channel 201 of the water distribution block, and then flows sequentially through the gasket channel 401, the cover channel 501, the annular steel sleeve channel 601, the annular cavity channel 701, the annular mounting sleeve channel 301, the top surface channel 202 of the water distribution block, and the inclined channel 203 of the water distribution block. Finally, it flows to the external heat exchanger through the return water pipe of the compression molding equipment, so that the coolant, whose temperature has risen after cooling, can exchange heat and cool down. Since the lower mold cover surface 5 and the lower mold cavity 7 are in direct contact with the molded product 600, and one of their surfaces is the forming surface of the molded product 600, when the coolant passes through the cover surface channel 501 in the lower mold cover surface 5 as described above, the coolant contacts the lower mold cover surface 5 and exchanges heat. Similarly, when the coolant passes through the annular steel sleeve channel 601 and the annular cavity channel 701, the coolant contacts the lower mold cavity 7 and exchanges heat, thereby cooling the two parts, the lower mold cover surface 5 and the lower mold cavity 7, and further cooling the molded product 600, so that it drops to a specific temperature for rapid molding.

[0005] The above describes the known structure of the lower mold in existing compression molding dies and the water channel structure and principle for cooling the molded product 600. However, it should be noted that to improve production efficiency, the mold opening and closing time needs to be minimized. To ensure the mold closes within a short time, the closing speed needs to be accelerated. Therefore, the upper and lower molds need to open frequently, generating more heat per unit time. Furthermore, after the upper and lower molds are closed, the cooling efficiency of the molded product 600 needs to be ensured to allow for rapid product molding. The closing force during mold closing mainly acts on the contact surface between the lower mold 200 and the upper mold 500, combined with… Figure 1 It can be seen that the clamping force mainly acts on the upper surface of the lower mold cavity 7. The upper surface of the lower mold cavity 7 needs to frequently contact the corresponding parts of the upper mold 500, withstand the corresponding impacts, and play a role in stopping and axial positioning. This places higher demands on the structural strength and precision of the lower mold cavity 7. Therefore, in order to ensure the strength and life of the lower mold cavity 7, while ensuring cooling efficiency, the lower mold cavity 7 also needs to take into account its rust prevention performance, strength, and heat treatment process performance. When these performances are all taken into account, the selection of materials for the lower mold cavity 7 is limited, which in turn limits its thermal conductivity. As a result, in the existing lower mold 200, the thermal conductivity of the material of the lower mold cover 5 is much smaller than that of the material of the mold cover 25, which affects the cooling efficiency of the lower mold 200 and the product molding cycle.

[0006] In addition, such as Figure 1 As shown, the coolant flows in the direction indicated by the arrow. During the process of the coolant flowing from the cover channel 501 into the annular steel sleeve channel 601, its flow direction is turned 90° due to the obstruction of the lower mold steel sleeve 6. Since the mold steel sleeve 26 and the lower mold cavity 7 are sequentially clamped between the upper end of the cavity mounting sleeve 3 and the lower mold washer 4 from bottom to top, the structure is complex and has many parts. The sealing performance of the mating surfaces between these parts is easily affected by machining and assembly errors, as well as the clamping force applied in the axial direction by the cavity mounting sleeve 3 and the lower mold washer 4. There may be gaps between the mating surfaces of the lower mold steel sleeve 6 and the lower mold washer 4. This may cause the coolant to return directly from the annular steel sleeve channel 601 through the mating surfaces of the lower mold washer 4 and the lower mold steel sleeve 6 to the annular mounting sleeve channel 301 during the aforementioned coolant turning process. This results in a reduction of the coolant entering the annular cavity channel 701. Furthermore, the coolant entering the annular channel 601 simultaneously contacts both the surfaces of the lower mold steel sleeve 6 and the lower mold cavity 7, with only the lower mold cavity 7 cooling the product. All of these factors reduce the cooling effect of the lower mold cavity 7 to some extent, affecting the cooling efficiency of the lower mold 200 and the product molding cycle.

[0007] Therefore, how to accelerate the cooling efficiency of the lower mold based on the existing lower mold structure remains a problem. Utility Model Content

[0008] The purpose of this invention is to provide a compression molding lower mold structure with high cooling efficiency, which can be made of different materials to better balance rust prevention, strength and heat treatment performance, thereby effectively improving cooling efficiency. At the same time, it can also effectively ensure that the coolant flows along the designated path, further improving cooling efficiency.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] This utility model provides a high-cooling-efficiency compression molding lower mold structure, including a cavity mounting sleeve, a lower mold gasket, and a lower mold cooling cavity; the lower mold cooling cavity includes a cooling outer cavity, and a cooling inner cavity is sleeved inside the cooling outer cavity, wherein the cooling outer cavity is sandwiched between the upper end of the cavity mounting sleeve and the lower mold gasket, and the side wall of the cooling outer cavity is provided with multiple outer cavity channels, the lower surface of the cooling inner cavity is provided with multiple transverse channels, and the outer side surface of the cooling inner cavity is arranged with multiple longitudinal channels, one end of the transverse channel is a coolant inlet, and the other end of the transverse channel is connected to the longitudinal channels and the outer cavity channels in sequence; and, the cooling outer cavity is provided with an upper mold pressure surface, and when the mold is closed, the upper mold pressure surface abuts against the upper mold in the axial direction.

[0011] Furthermore, the lower surface of the cooling outer cavity is provided with a first positioning recess, the inner side of the first positioning recess is in contact with the outer side of the lower mold gasket, and the upper surface of the first positioning recess is in contact with the upper surface of the lower mold gasket.

[0012] Furthermore, a first O-ring is provided between the first positioning recess and the lower mold gasket.

[0013] Furthermore, the inner side of the cooling outer cavity is provided with a second positioning recess, and the outer side of the cooling inner cavity is provided with an inner cavity boss. The upper and lower surfaces of the inner cavity boss are respectively attached to the upper surface of the second positioning recess and the upper surface of the lower mold washer. The lower end of the longitudinal channel passes through the inner cavity boss and communicates with the transverse channel.

[0014] Furthermore, a guide recess is provided on the inner side of the cooling outer cavity, and the guide recess cooperates with the outer side of the cooling inner cavity to form an annular liquid flow space, and the lower end of the longitudinal channel is connected to the liquid flow space.

[0015] Furthermore, an annular distribution channel is provided on the inner side of the cooling outer cavity, and the end of each outer cavity channel near the cooling inner cavity is connected to the annular distribution channel, and the upper end of each longitudinal channel is connected to the annular distribution channel.

[0016] Furthermore, an O-ring groove is provided on the inner side of the cooling outer cavity or the outer side of the cooling inner cavity, and a fourth O-ring is fitted inside the O-ring groove. The fourth O-ring is located above the annular distribution channel.

[0017] Furthermore, the cooling cavity includes a stepped inner cavity cover and an annular inner cavity sleeve, wherein the upper and lower ends of the inner cavity cover are coaxially connected to the inner cavity boss and the inner cavity sleeve, respectively, the transverse channel is provided on the lower surface of the inner cavity cover, and the longitudinal channel and O-ring groove are provided on the outer side of the inner cavity sleeve.

[0018] Furthermore, the upper surface of the inner cavity cover is tightly fitted with the lower surface of the inner cavity sleeve, and a fifth O-ring is provided between the inner cavity cover and the inner cavity sleeve, the fifth O-ring being coaxially nested in the inner cavity cover or the inner cavity sleeve.

[0019] Furthermore, the cooling inner cavity is made of a material with good thermal conductivity, and the cooling outer cavity is made of a material with rust-proof properties and good comprehensive mechanical properties.

[0020] Due to the adoption of the above structure, the beneficial effects of this utility model are as follows:

[0021] 1. This utility model divides the lower mold cooling cavity into an outer cooling cavity and an inner cooling cavity, and sets an upper mold pressure surface on the outer cooling cavity. When the mold is closed, the upper mold pressure surface abuts against the upper mold in the axial direction. The mold closing force generated by the collision between the upper and lower molds can be directly applied to the lower mold gasket through the outer cooling cavity, effectively reducing the impact of the mold closing force on the inner cooling cavity. This allows the outer and inner cooling cavities to be made of different materials. For example, a material with good thermal conductivity can be used to make the inner cooling cavity that contacts the product, while a material with rust prevention and good comprehensive mechanical properties can be used to make the outer cooling cavity. There is no need to consider the thermal conductivity of the outer cooling cavity and the upper positioning boss. Thus, while ensuring the cooling function, the lower mold cooling cavity can also take into account its rust prevention, strength, and heat treatment process performance. While improving the service life of the lower mold cooling cavity, its cooling efficiency is greatly improved, effectively ensuring the cooling efficiency of the product and thus accelerating the product molding cycle.

[0022] 2. In this invention, during the process of the coolant flowing from the transverse channel to the longitudinal channel, the coolant is blocked by the cooling outer cavity at the turning point. Furthermore, since the cooling outer cavity is sandwiched between the upper end of the cavity mounting sleeve and the lower mold gasket, the mold structure and processing difficulty of the lower mold are simplified, assembly errors are reduced, and the sealing performance of the mating surfaces between the cooling outer cavity and the lower mold gasket is improved. This effectively prevents coolant leakage from the mating surfaces between the cooling outer cavity and the lower mold gasket, ensuring that most or even all of the coolant enters the longitudinal channel, thereby guaranteeing the cooling efficiency of the lower mold and the product molding cycle. Moreover, since the material of the cooling outer cavity is not limited by the cooling inner cavity, it can be made of materials with rust-proof properties and comprehensive mechanical properties. The use of high-performance materials further enhances the cooling cavity's ability to withstand the clamping force exerted by the cavity mounting sleeve and lower mold gasket. This improves the tightness and sealing of the mating surfaces between the cooling cavity and the lower mold gasket, reducing leakage and ensuring the cooling efficiency of the lower mold and the product molding cycle. Furthermore, by using a cooling cavity made of a rust-resistant material with excellent overall mechanical properties to withstand the impact of the mold closing force, long-term wear and deformation are effectively reduced. This reduces the decrease in the sealing performance of the mating parts caused by wear and deformation, allowing the coolant to flow along a designated path, further reducing leakage and ensuring the cooling efficiency of the lower mold and the product molding cycle.

[0023] The present invention will become clearer from the following description and in conjunction with the accompanying drawings, which are used to explain the embodiments of the present invention. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a cross-sectional view of the existing upper and lower molds when they are joined together.

[0026] Figure 2 This is a perspective view of Embodiment 1 of the present invention;

[0027] Figure 3 This is a half-sectional view of the O-ring groove in the cooling cavity according to Embodiment 1 of the present invention.

[0028] Figure 4 This is a half-sectional view of the O-ring groove in the cooling outer cavity according to Embodiment 1 of the present invention;

[0029] Figure 5This is one of the perspective views of the cooling cavity in Embodiment 1 of the present invention;

[0030] Figure 6 This is a second perspective view of the cooling cavity in Embodiment 1 of the present invention;

[0031] Figure 7 This is a front view of the cooling cavity in Embodiment 1 of the present invention;

[0032] Figure 8 This is a bottom view of the cooling cavity in Embodiment 1 of the present invention;

[0033] Figure 9 This is a perspective view of the cooling outer cavity according to Embodiment 1 of the present invention;

[0034] Figure 10 This is a half-sectional view of the cooling outer cavity in Embodiment 1 of the present invention;

[0035] Figure 11 This is a half-sectional view of the O-ring groove in the cooling cavity according to Embodiment 2 of the present invention;

[0036] Figure 12 This is a half-sectional view of the O-ring groove in the cooling outer cavity according to Embodiment 2 of the present invention.

[0037] Reference numerals: Lower mold-200, Molded part-600, Upper mold-500, Locking end cap-1, Lower mold water divider-2, Water divider center channel-201, Water divider top surface channel-202, Water divider inclined channel-203, Cavity mounting sleeve-3, Annular mounting sleeve channel-301, Lower mold washer-4, Washer channel-401, Lower mold cover-5, Cover channel-501, Lower mold steel sleeve-6, Annular steel sleeve channel-601, Lower mold cavity-7, Annular cavity channel-701, Lower mold cooling cavity-8, Cooling inner cavity-801, Inner cavity cover-80101, Inner cavity sleeve-80102, Inner cavity Boss-8011, Longitudinal Channel-8012, O-ring Groove-8013, Transverse Channel-8014, Anti-slip Teeth-8015, Cavity Bottom-8016, Cooling Outer Cavity-802, First Positioning Recess-8021, Second Positioning Recess-8022, Guide Recess-8023, Outer Cavity Channel-8024, Annular Distribution Channel-8025, Upper Positioning Boss-8026, Fourth O-ring Seal-803, First O-ring Seal-804, Second O-ring Seal-805, Third O-ring Seal-806, Upper Mold Pressure Surface-807, Positioning Surface-808, Fifth O-ring Seal-809. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0039] Example 1

[0040] Please refer to Figures 1 to 10 This embodiment provides a high-cooling-efficiency compression molding lower mold structure, including a cavity mounting sleeve 3, a lower mold gasket 4, and a lower mold cooling cavity 8. The lower mold cooling cavity 8 includes a cooling outer cavity 802, within which a cooling inner cavity 801 is fitted. The cooling outer cavity 802 is sandwiched between the upper end of the cavity mounting sleeve 3 and the lower mold gasket 4, and its sidewalls are provided with multiple outer cavity channels 8024. The lower surface of the cooling inner cavity 801 is provided with multiple transverse channels 8014, and the outer surface of the cooling inner cavity 801 is surrounded by multiple longitudinal channels 8012. One end of the transverse channel 8014 is a coolant inlet, and the other end of the transverse channel 8014 is connected to the longitudinal channel 8012 and the outer cavity channel 8024 in sequence. The cooling outer cavity 802 is provided with an upper mold pressure surface 807. When the mold is closed, the upper mold pressure surface 807 abuts against the upper mold in the axial direction. The mold closing force generated by the collision between the upper and lower molds is directly applied to the lower mold washer 4 through the upper positioning boss 8026 and the cooling outer cavity 802 in sequence. This effectively reduces the impact of the mold closing force on the cooling inner cavity 801, so that the cooling outer cavity 802 and the cooling inner cavity 801 can be made of different materials.

[0041] Specifically, as the coolant is blocked by the cooling outer cavity 802 and then flows from the transverse channel 8014 into the longitudinal channel 8012, the cooling outer cavity 802 is sandwiched between the upper end of the cavity mounting sleeve 3 and the lower mold gasket 4. This single-part design simplifies the mold structure and processing difficulty of the lower mold, reduces assembly errors, and improves the sealing of the mating surface between the cooling outer cavity 802 and the lower mold gasket 4. This effectively prevents the coolant from leaking from the mating surface between the cooling outer cavity 802 and the lower mold gasket 4, ensuring that most or even all of the coolant enters the longitudinal channel 8012, thereby ensuring the cooling efficiency of the lower mold 200 and the product molding cycle.

[0042] Specifically, both the transverse channel 8014 and the longitudinal channel 8012 are groove-shaped structures. When the cooling inner cavity 801, the cooling outer cavity 802, and the lower mold gasket 4 are assembled as a whole, the lower surface of the cooling inner cavity 801 is in contact with the upper surface of the lower mold gasket 4, which can effectively prevent coolant from leaking into the mating surface between the cooling inner cavity 801 and the lower mold gasket 4, ensuring that the coolant flows along the transverse channel 8014. At the same time, the outer surface of the cooling inner cavity 801 is in contact with the inner surface of the cooling outer cavity 802, which can effectively prevent coolant from leaking into the mating surface between the cooling inner cavity 801 and the cooling outer cavity 802, ensuring that the coolant flows along the longitudinal channel 8012.

[0043] Preferably, the outer cavity channel 8024 is inclined downward along the liquid flow direction and its end away from the cooling inner cavity 801 is connected to the annular mounting sleeve channel 301, so that the coolant can flow out of the lower mold cooling cavity 8; the length direction of the longitudinal channel 8012 is parallel to the axis of the cooling inner cavity 801, and multiple transverse channels 8014 are arranged from the center of the lower surface of the cooling inner cavity 801 outward to improve the uniformity of cooling.

[0044] It should be noted that this embodiment also includes a locking end cap 1, a lower mold water distribution block 2, and a cavity mounting sleeve 3; wherein, the upper and lower ends of the lower mold water distribution block 2 are respectively sleeved with the lower mold gasket 4 and the locking end cap 1, and the upper and lower ends of the cavity mounting sleeve 3 are respectively sleeved with the lower mold cooling cavity 8 and the locking end cap 1, and the lower mold cooling cavity 8 is sandwiched between the upper end of the cavity mounting sleeve 3 and the lower mold gasket 4; furthermore, the lower mold water distribution block 2 is provided with a water distribution block central channel 201, and the lower mold gasket 4 is provided with a gasket channel 401, the water distribution block central channel 201 and the gasket channel 401 are coaxially connected, and the upper end of the water distribution block central channel 201 is connected to the inner cavity channel through the gasket channel 401 and the water distribution block central channel 201 is connected to the inner cavity channel. The lower end of channel 201 is connected to the water inlet pipe of the compression molding equipment, so that the coolant can flow into the inner cavity channel to cool the lower mold cooling cavity 8; and, the inner side of the cavity mounting sleeve 3 is provided with an annular mounting sleeve channel 301, the upper surface of the lower mold water distribution block 2 is provided with a water distribution block top surface channel 202, and the lower mold water distribution block 2 is provided with a water distribution block inclined channel 203. The outer cavity channel 8024 is connected in sequence to the annular mounting sleeve channel 301, the water distribution block top surface channel 202, and the water distribution block inclined channel 203, and the water distribution block inclined channel 203 is connected to the return water pipe of the compression molding equipment, so that the coolant whose temperature rises after cooling can flow through the return water pipe to the external heat exchanger for heat exchange and cooling.

[0045] A second O-ring 805 is provided between the cavity mounting sleeve 3 and the cooling outer cavity 802, which can improve the sealing performance of the mating surfaces between the cavity mounting sleeve 3 and the cooling outer cavity 802.

[0046] A third O-ring 806 is fitted between the cavity mounting sleeve 3 and the lower mold water distribution block 2, which can improve the sealing performance of the mating surfaces between the cavity mounting sleeve 3 and the lower mold water distribution block 2.

[0047] In this embodiment, a first positioning recess 8021 is provided on the lower surface of the cooling outer cavity 802. The inner side of the first positioning recess 8021 is in contact with the outer side of the lower mold washer 4. This can restrict the radial degree of freedom between the cooling outer cavity 802 and the lower mold washer 4, realize the coaxial sleeve connection between the cooling outer cavity 802 and the lower mold washer 4, and at the same time, it can play a sealing role between the inner side of the first positioning recess 8021 and the outer side of the lower mold washer 4.

[0048] The upper surface of the first positioning recess 8021 is in contact with the upper surface of the lower mold gasket 4, which restricts the axial freedom between the cooling outer cavity 802 and the lower mold gasket 4, while also providing a sealing effect between the upper surface of the first positioning recess 8021 and the upper surface of the lower mold gasket 4.

[0049] In this embodiment, a first O-ring 804 is sandwiched between the first positioning recess 8021 and the lower mold gasket 4, which can further improve the sealing of the mating surface between the first positioning recess 8021 and the lower mold gasket 4 and reduce leakage.

[0050] Optionally, the first O-ring 804 is coaxially sleeved between the inner side of the first positioning recess 8021 and the outer side of the lower mold washer 4, or the first O-ring 804 is coaxially sleeved between the upper surface of the first positioning recess 8021 and the upper surface of the lower mold washer 4.

[0051] In this embodiment, the inner side of the cooling outer cavity 802 is provided with a second positioning recess 8022, and the outer side of the cooling inner cavity 801 is provided with an inner cavity boss 8011. The upper and lower surfaces of the inner cavity boss 8011 are respectively attached to the upper surface of the second positioning recess 8022 and the upper surface of the lower mold washer 4. The lower end of the longitudinal channel 8012 passes through the inner cavity boss 8011 and communicates with the transverse channel 8014.

[0052] Since the upper and lower surfaces of the inner cavity boss 8011 are respectively attached to the upper surface of the second positioning recess 8022 and the upper surface of the lower mold washer 4, on the one hand, the relative degree of freedom of the inner cavity boss 8011 in the axial direction can be restricted; on the other hand, the lower surface of the inner cavity boss 8011 is attached to the upper surface of the lower mold washer 4, which can also effectively intercept the coolant when it turns from the transverse channel 8014 to the longitudinal channel 8012, further reducing the leakage of coolant during the turning process.

[0053] The lower surface of the inner cavity boss 8011 is on the same horizontal plane as the lower surface of the cooling inner cavity 801, and the inner cavity boss 8011 and the cooling inner cavity 801 are coaxial and fixedly connected.

[0054] In this embodiment, a guide recess 8023 is provided on the inner side of the cooling outer cavity 802. The guide recess 8023 and the outer side of the cooling inner cavity 801 cooperate to form an annular liquid flow space. The lower end of the longitudinal channel 8012 is connected to the liquid flow space.

[0055] As the coolant flows from the transverse channel 8014 into the longitudinal channel 8012, it first enters the liquid flow space and fills the entire annular liquid flow space before flowing into each longitudinal channel 8012. On the one hand, this achieves a redistribution effect, so that the number and position of each longitudinal channel 8012 do not need to correspond one-to-one with each transverse channel 8014, effectively reducing the processing difficulty and the uniformity of cooling. On the other hand, the process of the coolant filling the liquid flow space can play a certain buffering role for the coolant, effectively reducing the impact force of the liquid flow on the mating surface between the cooling outer cavity 802 and the cooling inner cavity 801, further reducing leakage.

[0056] Preferably, the inner diameters of the first positioning recess 8021, the second positioning recess 8022, and the guide recess 8023 are successively reduced to form a stepped structure.

[0057] In this embodiment, an annular distribution channel 8025 is provided on the inner side of the cooling outer cavity 802. The end of each outer cavity channel 8024 near the cooling inner cavity 801 is connected to the annular distribution channel 8025, and the upper end of each longitudinal channel 8012 is connected to the annular distribution channel 8025.

[0058] Specifically, the annular distribution channel 8025 is open on the side away from the outer cavity channel 8024, so that the coolant in the multiple longitudinal channels 8012 can flow into the annular distribution channel 8025 and fill the entire annular distribution channel 8025, and then flow out of the lower mold cooling cavity 8 through each outer cavity channel 8024, achieving the effect of redistribution. Thus, the number and position of each longitudinal channel 8012 do not need to correspond one-to-one with each outer cavity channel 8024, effectively reducing the difficulty of processing and assembling each component.

[0059] In this embodiment, an O-ring groove 8013 is provided on the inner side of the cooling outer cavity 802 or the outer side of the cooling inner cavity 801. A fourth O-ring seal 803 is sleeved inside the O-ring groove 8013. The fourth O-ring seal 803 is located above the annular distribution channel 8025. The fourth O-ring seal 803 being located above the annular distribution channel 8025 can improve the sealing performance between the cooling outer cavity 802 and the cooling inner cavity 801, effectively preventing the coolant in the longitudinal channel 8012 from leaking from the mating surface between the cooling outer cavity 802 and the cooling inner cavity 801. This ensures that most or even all of the coolant in the longitudinal channel 8012 can enter the outer cavity channel 8024 through the annular distribution channel 8025, ensuring that the coolant flows along the designated route.

[0060] Among them, such as Figure 4 As shown, when the fourth O-ring 803 is nested on the cooling outer cavity 802 through the O-ring groove 8013, it can ensure that the upper mold pressure surface 807 has a large area, while effectively reducing the thickness of the inner cavity cover surface 80101. This avoids the impact on the cooling effect of the product caused by the cooling inner cavity 801 needing a large thickness to open the O-ring groove 8013 when the fourth O-ring 803 is nested on the cooling inner cavity 801.

[0061] As a further improvement of this embodiment, an upper positioning boss 8026 is coaxially sleeved on the top of the cooling outer cavity 802. The upper positioning boss 8026 is integrally formed with the cooling outer cavity 802 and has a positioning surface 808. When the mold is closed, the positioning surface 808 abuts against the upper mold in the radial direction, which can position the relative position of the upper positioning boss 8026 and the upper mold in the radial direction, realizing the coaxial sleeve of the upper positioning boss 8026 and the upper mold when the mold is closed. This ensures the coaxiality of the upper mold and the cooling outer cavity 802, and the cooling outer cavity 802, thereby reducing the deviation between the cooling inner cavity 801 and the upper mold and the mold wear when the mold is closed, improving the accuracy of the molded product and the service life of the mold. In particular, when the upper positioning boss 8026 is made of a material with anti-rust properties and good comprehensive mechanical properties, the long-term service life of the mold can be further improved.

[0062] As a further improvement of this embodiment, the inner surface of the cooling cavity 801 is provided with anti-slip teeth 8015, and the inner bottom surface of the cooling cavity 801 is the cavity bottom 8016. When the mold is closed, the cooling cavity 801 and the upper mold are fitted with a clearance, which can press the rubber material located between the inner surface of the cooling cavity 801 and the outer surface of the upper mold into a thin-walled product with anti-slip teeth 8015.

[0063] In this embodiment, the cooling inner cavity 801 is made of a material with good thermal conductivity, and the cooling outer cavity 802 is made of a material with rust-proof properties and good comprehensive mechanical properties. The plastic material is compressed and molded by the gap fit between the cooling inner cavity 801 and the upper mold. The heat generated during mold closing is exchanged with the coolant through the cooling inner cavity 801, which has good thermal conductivity, effectively improving cooling efficiency and shortening the product molding cycle. The cooling outer cavity 802, which has rust-proof properties and good comprehensive mechanical properties, withstands the impact force generated during mold closing, effectively ensuring the service life of the lower mold cooling cavity 8. Furthermore, the cooling outer cavity 802, with its good comprehensive mechanical properties, withstands the clamping force applied by the cavity mounting sleeve 3 and the lower mold gasket 4, further improving the tightness and sealing of the mating surfaces between the cooling outer cavity 802 and the lower mold gasket 4, thereby reducing leakage and ensuring the cooling efficiency of the lower mold and the product molding cycle. In addition, by using a cooling outer cavity 802 made of a material with rust-proof properties and good comprehensive mechanical properties to withstand the impact of the mold closing force, it can effectively reduce wear and deformation caused by long-term operation, thereby reducing the decrease in the sealing performance of the parts due to wear and deformation, allowing the coolant to flow along the designated path, further reducing leakage, and ensuring the cooling efficiency of the lower mold and the product molding cycle.

[0064] Example 2

[0065] Please refer to Figure 11 and Figure 12 The difference between this embodiment and Embodiment 1 is that:

[0066] In this embodiment, the cooling cavity 801 includes a stepped inner cavity cover 80101 and an annular inner cavity sleeve 80102. The upper and lower ends of the inner cavity cover 80101 are coaxially sleeved with the inner cavity boss 8011 and the inner cavity sleeve 80102, respectively. The transverse channel 8014 is disposed on the lower surface of the inner cavity cover 80101, and the longitudinal channel 8012 and the O-ring groove 8013 are disposed on the outer side of the inner cavity sleeve 80102.

[0067] Specifically, the inner cavity cover 80101 and the inner cavity boss 8011 are integrally formed, and the inner cavity cover 80101 is sleeved with the inner cavity sleeve 80102 by interference fit, thread or snap-fit; by splitting the cooling inner cavity 801 into the inner cavity cover 80101 and the inner cavity sleeve 80102, the difficulty of production and assembly can be reduced.

[0068] In this embodiment, the upper surface of the inner cavity cover 80101 is in close contact with the lower surface of the inner cavity sleeve 80102, and a fifth O-ring seal 809 is provided between the inner cavity cover 80101 and the inner cavity sleeve 80102. The fifth O-ring seal 809 is coaxially nested in the inner cavity cover 80101 or the inner cavity sleeve 80102, thereby effectively improving the sealing performance of the mating surface between the inner cavity cover 80101 and the inner cavity sleeve 80102 and preventing coolant leakage from the mating surface between the inner cavity cover 80101 and the inner cavity sleeve 80102.

[0069] The preferred embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above. Devices and structures not described in detail herein should be understood as being implemented in a conventional manner within the art. Any person skilled in the art can make many possible variations and modifications to the technical solutions of this utility model using the disclosed methods and techniques, or modify them into equivalent embodiments with equivalent changes, without departing from the scope of the technical solution of this utility model. This does not affect the essential content of this utility model. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model, without departing from the content of the technical solution of this utility model, still fall within the protection scope of the technical solution of this utility model.

Claims

1. A compression molding lower mold structure with high cooling efficiency, comprising a cavity mounting sleeve (3), a lower mold gasket (4), and a lower mold cooling cavity (8); characterized in that: The lower mold cooling cavity (8) includes a cooling outer cavity (802), and a cooling inner cavity (801) is provided inside the cooling outer cavity (802). The cooling outer cavity (802) is sandwiched between the upper end of the cavity mounting sleeve (3) and the lower mold gasket (4), and the side wall of the cooling outer cavity (802) is provided with multiple outer cavity channels (8024). The lower surface of the cooling inner cavity (801) is provided with multiple transverse channels (8014), and the outer side surface of the cooling inner cavity (801) is surrounded by multiple longitudinal channels (8012). One end of the transverse channel (8014) is a coolant inlet, and the other end of the transverse channel (8014) is connected to the longitudinal channel (8012) and the outer cavity channel (8024) in sequence. The cooling outer cavity (802) is provided with an upper mold pressure surface (807). When the mold is closed, the upper mold pressure surface (807) abuts against the upper mold in the axial direction.

2. The compression molding lower mold structure with high cooling efficiency according to claim 1, characterized in that: The lower surface of the cooling outer cavity (802) is provided with a first positioning recess (8021), the inner side of the first positioning recess (8021) is in contact with the outer side of the lower mold gasket (4), and the upper surface of the first positioning recess (8021) is in contact with the upper surface of the lower mold gasket (4).

3. The compression molding lower mold structure with high cooling efficiency according to claim 2, characterized in that: A first O-ring (804) is sandwiched between the first positioning recess (8021) and the lower mold gasket (4).

4. A compression molding lower mold structure with high cooling efficiency according to any one of claims 1 to 3, characterized in that: The inner side of the cooling outer cavity (802) is provided with a second positioning recess (8022), and the outer side of the cooling inner cavity (801) is provided with an inner cavity boss (8011). The upper and lower surfaces of the inner cavity boss (8011) are respectively attached to the upper surface of the second positioning recess (8022) and the upper surface of the lower mold washer (4). The lower end of the longitudinal channel (8012) passes through the inner cavity boss (8011) and communicates with the transverse channel (8014).

5. A compression molding lower mold structure with high cooling efficiency according to any one of claims 1 to 3, characterized in that: The inner side of the cooling outer cavity (802) is provided with a guide recess (8023), which cooperates with the outer side of the cooling inner cavity (801) to form an annular liquid flow space. The lower end of the longitudinal channel (8012) is connected to the liquid flow space.

6. The compression molding lower mold structure with high cooling efficiency according to claim 4, characterized in that: The inner side of the cooling outer cavity (802) is provided with an annular distribution channel (8025). The end of each outer cavity channel (8024) near the cooling inner cavity (801) is connected to the annular distribution channel (8025), and the upper end of each longitudinal channel (8012) is connected to the annular distribution channel (8025).

7. The compression molding lower mold structure with high cooling efficiency according to claim 6, characterized in that: An O-ring groove (8013) is provided on the inner side of the cooling outer cavity (802) or the outer side of the cooling inner cavity (801). A fourth O-ring seal (803) is fitted inside the O-ring groove (8013). The fourth O-ring seal (803) is located above the annular distribution channel (8025).

8. The compression molding lower mold structure with high cooling efficiency according to claim 7, characterized in that: The cooling cavity (801) includes a stepped inner cavity cover (80101) and an annular inner cavity sleeve (80102). The upper and lower ends of the inner cavity cover (80101) are coaxially connected to the inner cavity boss (8011) and the inner cavity sleeve (80102), respectively. The transverse channel (8014) is provided on the lower surface of the inner cavity cover (80101), and the longitudinal channel (8012) and the O-ring groove (8013) are provided on the outer side of the inner cavity sleeve (80102).

9. A compression molding lower mold structure with high cooling efficiency according to claim 8, characterized in that: The upper surface of the inner cavity cover (80101) is in close contact with the lower surface of the inner cavity sleeve (80102), and a fifth O-ring (809) is provided between the inner cavity cover (80101) and the inner cavity sleeve (80102). The fifth O-ring (809) is coaxially nested in the inner cavity cover (80101) or the inner cavity sleeve (80102).

10. A compression molding lower mold structure with high cooling efficiency according to any one of claims 1 to 3, characterized in that: The cooling inner cavity (801) is made of a material with good thermal conductivity, and the cooling outer cavity (802) is made of a material with rust prevention and good comprehensive mechanical properties.

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