Compression molding mold

Abstract

The invention discloses a compression molding mold which comprises an upper mold and a lower mold, a cover core cooling water channel and a cover wall cooling water channel are arranged in the upper die, part of the cover core cooling water channel and part of the cover wall cooling water channel pass through the lower end of the upper die, and the part, located at the lower end of the upper die, of the cover wall cooling water channel surrounds the outer side of the cover core cooling water channel. The bottom face and the side face of the bottle cap can be cooled at the same time, and the cooling device has the advantages of being large in cooling area, wide in range, short in period and high in product forming quality.

Description

Technical Field

[0001] The present invention relates to the technical field of bottle cap manufacturing, in particular to a compression molding die. Background Art

[0002] With economic development, plastic packaging is increasing, and the majority of plastic packaging, such as liquid packaging, comes in the form of bottles or cans. Liquid packaging requires not only bottles but also caps for sealing. As fast-moving consumer goods (FMCGs), the demand for drinking water and other beverages is extremely high, and the demand for bottle caps, a corresponding packaging material, is also growing.

[0003] Currently, there are two main methods for producing bottle caps: injection molding, which requires more space and a long molding cycle, making it suitable for products with large diameters and low production capacity requirements. Compression molding, using upper and lower molds, is suitable for products with medium diameters and high production capacity requirements, and is currently primarily used for drinking water bottle caps. However, compression molding, due to its very short molding cycle, places high demands on the cooling of both the product and the mold.

[0004] In order to achieve the effect of rapid cooling, the prior art generally sets a cooling system on the forming mold. For example, Chinese invention patent application number CN201420524180.9 discloses a bottle cap molding machine upper mold assembly, which is provided with a cooling device in the core mold shaft, the cooling device including a water diverter shaft, a water diverter block, a cooling water inlet pipe and a cooling water outlet pipe, and a water inlet and a water outlet are provided on the water diverter block. Cooling water flows in from the water inlet, flows to the cooling water outlet pipe through the cooling water inlet pipe, and then flows out from the water outlet, thereby cooling the bottle cap molding machine upper mold assembly. However, the diameters of the cooling water inlet pipe and the cooling water outlet pipe of the bottle cap molding machine upper mold assembly remain unchanged from top to bottom. The heat exchange area when the cooling water and the bottle cap are heat exchanged is limited by the size of the cooling water inlet pipe and the cooling water outlet pipe. Often, only the central area of ​​the bottle cap can be cooled, and the effective cooling range is small. In particular, the cooling speed of the threaded side of the bottle cap is slow, which affects the molding efficiency of the product and the molding quality of the inner thread of the bottle cap. In addition, during the compression molding process of the bottle cap, the bottle cap is placed on the outer side of the bottom of the upper mold. The upper mold assembly of the above-mentioned bottle cap molding machine can only cool the bottle cap from the inside to the outside of the bottle cap, and the cooling effect on the outside of the bottle cap is poor. In particular, the outer side of the existing bottle cap is usually provided with anti-slip grooves. If the cooling effect on the outside of the bottle cap is not good, problems such as tearing of the edge are likely to occur when the cap is removed, affecting the molding quality of the product. Summary of the Invention

[0005] The object of the present invention is to provide a compression molding die, which has a large cooling area and a wide cooling range for the product, can effectively shorten the cooling cycle of the product, and at the same time ensure the molding quality of the product.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] The present invention provides a compression molding mold, comprising an upper mold and a lower mold; a cover core cooling water channel and a cover wall cooling water channel are arranged inside the upper mold, and parts of the cover core cooling water channel and the cover wall cooling water channel pass through the lower end of the upper mold, and the above-mentioned cover wall cooling water channel is located at the lower end of the upper mold and surrounds the outside of the cover core cooling water channel, and a plurality of bottom cooling channels and a plurality of side cooling channels are arranged inside the lower mold, wherein each of the bottom cooling channels diverges along the radial direction of the lower mold, and each of the side cooling channels surrounds the outside of the axis of the lower mold in parallel.

[0008] Furthermore, the upper mold includes an upper mold shell, and the inner side of the upper mold shell is sequentially sleeved with an upper mold cooling cylinder core, an upper mold core tube, and a cooling core tube from the outside to the inside, wherein the upper mold core tube and the cooling core tube are clearance-matched to form an inner water inlet channel, and both ends of the upper mold core tube are connected to form an inner water outlet channel, and the lower end of the inner water inlet channel is connected to the lower end of the inner water outlet channel to form the cover core cooling water path, and the upper mold cooling cylinder core is provided with an outer water inlet channel and an outer water outlet channel, and the lower end of the upper mold cooling cylinder core is provided with a wall cooling channel arranged around its outer side wall, and the two ends of the wall cooling channel are respectively connected with the outer water inlet channel and the outer water outlet channel to form the cover wall cooling water path, and the cover wall cooling water path is connected to the cover core cooling water path through a return pipe.

[0009] Furthermore, the wall cooling channel includes a plurality of cooling water grooves, which are distributed around the outer side wall of the lower end of the upper mold cooling cylinder core, and water diversion grooves are opened on both sides of the outer side wall of the lower end of the upper mold cooling cylinder core, and an annular water groove is opened on the outer side wall of the lower end of the upper mold cooling cylinder core. The annular water groove is connected to one of the diversion grooves through a part of the cooling water groove, and the above-mentioned annular water groove is connected to the other diversion groove through another part of the cooling water groove. The two diversion grooves are respectively connected to the external water inlet channel and the external water outlet channel through two lower cooling water holes.

[0010] Furthermore, the upper mold also includes an upper mold shaft core with two ends passing through, the top of the cooling core tube is fixedly sleeved with the upper mold shaft core and the rest of the cooling core tube is gap-matched with the upper mold shaft core, the upper end of the above-mentioned cooling core tube is connected to the return pipe through the upper end of the upper mold shaft core, the upper end of the upper mold core tube is fixedly sleeved with the lower end of the upper mold shaft core and the upper mold core tube is connected to the side water inlet pipe through the gap between the cooling core tube and the upper mold shaft core.

[0011] Furthermore, a core water inlet hole and a core water outlet hole are provided on the side wall of the upper end of the upper mold cooling core, and the core water inlet hole and the core water outlet hole are connected to the external water inlet channel and the external water channel respectively, and the lower end of the return pipe is connected to the core water inlet hole, and the external water channel is connected to a return water joint through the core water outlet hole.

[0012] Furthermore, the lower mold includes a cavity mounting sleeve, the lower end of the inner side of the cavity mounting sleeve is provided with a lower mold water dividing block and the upper end of the inner side of the cavity mounting sleeve is provided with a cooling outer cavity and a cooling inner cavity in sequence from the outside to the inside, wherein the side wall of the cooling outer cavity is penetrated by a plurality of outer cavity channels and the lower end of the cooling outer cavity is gap-matched with the cavity mounting sleeve to form an annular cavity, a plurality of side cooling channels are arranged around the outer side wall of the cooling inner cavity and the length direction of each side cooling channel is parallel to the axial direction of the cooling inner cavity, a plurality of bottom cooling channels are divergently arranged on the bottom surface of the cooling inner cavity, and a lower mold cover is sandwiched between the lower mold water dividing block and the cooling inner cavity, a lower mold water inlet hole and a lower mold water outlet channel are provided on the lower mold water dividing block, a cover through hole is provided on the lower mold cover, and the lower mold water inlet hole, the cover through hole, the bottom cooling channel, the side cooling channel, the outer cavity channel, the annular cavity and the lower mold water outlet channel are connected in sequence.

[0013] Furthermore, it also includes an upper mold demoulding mechanism, which includes a demoulding guide shaft that can be raised and lowered, the lower end of the demoulding guide shaft is connected to a demoulding claw, and the end of the demoulding claw away from the demoulding guide shaft is connected to a demoulding shell, the demoulding shell is slidably mounted on the outside of the upper mold shell and the lower end of the demoulding shell can be against the formed bottle cap.

[0014] Furthermore, the upper mold shell includes an anti-loosening nut, a water air block, a support sleeve, and an internal thread forming cylinder, and the anti-loosening nut, water air block, support sleeve, and internal thread forming cylinder are sequentially sleeved on the outer side of the upper mold cooling cylinder core from top to bottom to form a core-de-coupling mechanism that can slide relative to the upper mold core tube, wherein the anti-loosening nut and water air block are fixedly connected to the upper mold cooling cylinder core, and the two ends of the support sleeve are respectively in conflict with the water air block and the internal thread forming cylinder, and the outer side of the support sleeve is sleeved with an upper mold thread return spring, the upper end of the upper mold thread return spring is connected / in conflict with the water air block and the lower end of the upper mold thread return spring is connected / in conflict with the upper mold shaft sleeve, the upper mold shaft sleeve is fixedly connected to the upper mold turntable of the injection molding machine, and the upper mold cooling cylinder core is provided with at least one upper mold cooling cylinder core positioning block for limiting the rotational freedom and axial movement distance of the support sleeve, and at least one upper mold cover internal thread positioning block for limiting the rotational freedom and axial movement distance of the internal thread forming cylinder.

[0015] Furthermore, the demoulding shell includes an inner sleeve and a large upper mold ejection and reset spring, wherein the inner sleeve sliding sleeve is arranged on the outside of the upper mold shell and the outer fixed sleeve of the inner sleeve is provided with a demoulding device, the lower end of the demoulding device can be abutted against the formed bottle cap and the side wall of the demoulding device is provided with a slot, the slot is clamped with the end of the demoulding claw away from the demoulding guide shaft, and the two ends of the upper mold ejection and reset spring are respectively connected to the inner sleeve and the upper mold shaft sleeve.

[0016] Furthermore, the upper mold demoulding mechanism also includes a bearing, a guide shaft mounting flange, and a demoulding spring, wherein the bearing is arranged at the upper end of the demoulding guide shaft, and the demoulding spring is slidably sleeved on the outside of the demoulding guide shaft, the lower end of the above-mentioned demoulding spring is connected / interfered with the upper mold turntable of the injection molding machine and the upper end of the demoulding spring is fixedly connected to the demoulding guide shaft through a clamp, the guide shaft mounting flange is fixed on the upper mold turntable of the injection molding machine and the bottom surface of the guide shaft mounting flange is interfering with the clamp, and the upper end of the demoulding guide shaft is connected to the power mechanism of the injection molding machine via the bearing.

[0017] Due to the adoption of the above structure, the present invention has the following beneficial effects:

[0018] 1. The present invention provides a cap core cooling water channel and a cap wall cooling water channel inside the upper mold. When the coolant flows through the cap core cooling water channel, the inner bottom surface of the bottle cap can be cooled. When the coolant flows through the cap wall cooling water channel, the inner side surface of the bottle cap can be cooled. Thus, the bottom and side surfaces of the bottle cap are cooled simultaneously from the inside out. The cooling area is large and the cooling range is wide, which can effectively shorten the cooling cycle of the product while ensuring the molding quality of the product.

[0019] 2. The present invention provides multiple bottom cooling channels and multiple side cooling channels inside the lower mold. When the coolant flows through the bottom cooling channels, it can cool the outer bottom surface of the bottle cap, and when the coolant flows through the side cooling channels, it can cool the outer side surface of the bottle cap, thereby achieving the effect of cooling the bottom and side surfaces of the bottle cap from the outside to the inside at the same time, cooling more comprehensively, further shortening the cooling cycle of the product and further ensuring the molding quality of the product.

[0020] The present invention will become more apparent from the following description taken in conjunction with the accompanying drawings, which are used to illustrate embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention when the mold is closed;

[0023] Figure 2 This is a schematic diagram of the overall structure of the present invention before mold closing;

[0024] Figure 3 This is a schematic structural diagram of the upper mold during mold closing of the present invention;

[0025] Figure 4 It is a structural schematic diagram of the core stripping mechanism of the present invention;

[0026] Figure 5 This is a partial enlarged view of the bottom surface of the upper mold core tube and the bottom surface of the bottle cap of the present invention when they are separated;

[0027] Figure 6 This is a partial enlarged view of the present invention before the bottom surface of the upper mold core tube is separated from the bottom surface of the bottle cap;

[0028] Figure 7 It is a structural schematic diagram of the upper mold of the present invention;

[0029] Figure 8 It is a front view of the upper mold cooling cylinder core of the present invention;

[0030] Figure 9 A side view of the upper mold cooling cylinder core of the present invention

[0031] Figure 10 It is a structural schematic diagram of the lower mold of the present invention.

[0032] Reference numerals:

[0033] Lower mold 1; cavity mounting sleeve 101; cooling outer cavity 102, outer cavity channel 1021, annular cavity 1022; cooling inner cavity 103; lower mold water block 104, lower mold water inlet hole 1041, lower mold water outlet channel 1042; lower mold cover 105, cover through hole 1051;

[0034] Upper mold 2; upper mold shell 201, locknut 2011, water block 2012, support sleeve 2013, internal thread forming cylinder 2014, upper mold thread return spring 2015, upper mold shaft sleeve 2016, upper mold adapter flange 2017; upper mold cooling cylinder core 202, cylinder core water inlet hole 2021, cylinder core water outlet hole 2022, return water joint 2023, upper mold cover internal thread positioning block 2025, upper mold cooling cylinder core positioning block 2 024; upper die core tube 203; cooling core tube 204; inner water inlet channel 205; inner water outlet channel 206; outer water inlet channel 207; outer water outlet channel 208; wall cooling channel 209, cooling water trough 2091, water distribution trough 2092, annular water trough 2093, lower cooling water hole 2094; upper die shaft 210; upper die nut 211; upper die mounting flange 212, side water inlet pipe 213, locking nut 214;

[0035] Upper mold release mechanism-3, bearing-301, guide shaft mounting flange-302, demolding guide shaft-303, demolding spring-304, demolding claw-305, demolding shell-306, inner sleeve-3061, upper mold ejection and reset spring-3062, demolding device-3063, slot-3064;

[0036] Cap core cooling water channel-4, cap wall cooling water channel-5, bottom cooling channel-6, side cooling channel-7, compression molding machine upper mold turntable-8, bottle cap-9, plastic block-9', return pipe-10. DETAILED DESCRIPTION

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0038] Please refer to Figures 1 to 10The present invention provides a compression molding mold, comprising an upper mold 2 and a lower mold 1, wherein the upper mold 2 is suspended above the lower mold 1 by an upper mold turntable 8 of a compression molding machine (only a portion is shown in the drawings of the specification), and the lower mold 1 is fixedly connected to the piston rod of the compression molding machine (not shown in the figure). When the mold is closed, the piston rod of the compression molding machine pushes the lower mold 1 upward, so that the lower end of the upper mold 2 cooperates with the lower mold 1, and the molten plastic block 9' can be pressed into a bottle cap 9; a cap core cooling water channel 4 and a cap wall cooling water channel 5 are provided inside the upper mold 2, and part of the cap core cooling water channel 4 and the cap wall cooling water channel 5 pass through the lower end of the upper mold 2, and the above-mentioned cap wall cooling water channel 5 is located at the lower end of the upper mold 2 and surrounds the outside of the cap core cooling water channel 4. When in use, the cooling water channel of the compression molding machine transports coolant to the internal water channel of the upper mold 2; when the coolant flows through the cap core cooling water channel 2, the coolant can cool the inner bottom surface of the bottle cap 9; when the coolant flows through the cap wall cooling water channel 5, the coolant can cool the inner side surface of the bottle cap 9, so that the coolant can cool the bottom and side surfaces of the bottle cap 9 from the inside to the outside at the same time, with a large cooling area, a wide cooling range, and more comprehensive cooling, which can effectively shorten the cooling cycle of the product and ensure the molding quality of the product.

[0039] In the present invention, the upper mold 2 includes an upper mold shell 201, and the inner side of the upper mold shell 201 is sequentially sleeved with an upper mold cooling cylinder core 202, an upper mold core tube 203, and a cooling core tube 204 from the outside to the inside, wherein the upper mold core tube 203 and the cooling core tube 204 are clearance-matched to form an inner water inlet channel 205, and the upper end of the inner water inlet channel 205 is the water inlet end of the coolant; the two ends of the upper mold core tube 203 are connected to form an inner water outlet channel 206, and the upper end of the inner water outlet channel 206 is connected to the upper end of the return pipe 10; the lower end of the inner water inlet channel 205 is connected to the lower end of the inner water outlet channel 206 to form the cover core cooling water path 4, and the upper mold cooling cylinder core 202 is provided with an outer water inlet channel 207 and an outer water outlet channel 208, and the outer water inlet channel 207 and the outer water outlet channel The channels 208 extend along the length direction of the upper mold cooling cylinder core 102, the upper end of the external water inlet channel 207 is connected to the lower end of the return pipe 10, and the upper end of the external water channel 208 is connected to the return water joint 2023; the lower end of the upper mold cooling cylinder core 202 is provided with a cooling channel 33 arranged around its outer side wall, and the two ends of the wall cooling channel 209 are respectively connected to the external water inlet channel 207 and the external water channel 208 to form the cover wall cooling water channel 5, so as to cool the side and threaded part of the bottle cap 9; the cover wall cooling water channel 5 is connected to the cover core cooling water channel 4 through the return pipe 10, and the coolant in the cover core cooling water channel 4 can flow into the cover wall cooling water channel 5 through the return pipe 10, thereby extending the flow path of the coolant in the upper mold 2 and enabling the coolant to fully absorb heat.

[0040] Please refer to Figure 8 and Figure 9The wall cooling channel 209 includes a plurality of cooling water grooves 2091, and the plurality of cooling water grooves 2091 are distributed around the outer side wall of the lower end of the upper mold cooling cylinder core 202, and both sides of the outer side wall of the lower end of the upper mold cooling cylinder core 202 are provided with a water distribution groove 2092 and the outer side wall of the lower end of the upper mold cooling cylinder core 202 is provided with an annular water groove 2093, the annular water groove 2093 is connected to one of the water distribution grooves 2092 through a part of the cooling water groove 2091, and the annular water groove 2093 is connected to the other water distribution groove 2092 through another part of the cooling water groove 2091. The water trough 2092 is connected, and the two water branch troughs 2092 are respectively connected to the external water inlet channel 207 and the external water channel 208 through the two lower cooling water holes 2094, so that the coolant can flow through the external water inlet channel 207, one of the lower cooling water holes 2094, one of the water branch troughs 2092, a part of the cooling water trough 2091, the annular water trough 2093, another part of the cooling water trough 2091, another water branch trough 2092, another lower cooling water hole 2094, and the external water channel 208 in sequence, which can effectively cool the side and threaded parts of the bottle cap 9.

[0041] Preferably, the two water diversion grooves 2092 and the two lower cooling water holes 2094 are symmetrically arranged on both sides of the upper mold cooling cylinder core 102, the number of the cooling water grooves 2091 is an even number and is divided into two halves and connected to the two water diversion grooves 2092 respectively, and the lower cooling water holes 2094, the water diversion grooves 2092, the cooling water groove 2091, and the annular water groove 2093 are connected in sequence from top to bottom.

[0042] Please refer to Figure 7 The upper mold 2 also includes an upper mold shaft core 210 with two ends passing through. The top of the cooling core tube 204 is fixedly sleeved with the upper mold shaft core 210 and the rest of the cooling core tube 204 is in clearance with the upper mold shaft core 210. The upper end of the cooling core tube 204 is connected to the return pipe 10 through the upper end of the upper mold shaft core 210, so that the coolant can flow through the cooling core tube 104, the upper end of the upper mold shaft core 105, and the return pipe 10 in sequence, that is, flow into the inner water outlet channel 206. Return pipe 10; the upper end of the upper mold core tube 203 is fixedly connected to the lower end of the upper mold shaft core 210 and the upper mold core tube 203 is connected to the side water inlet pipe 213 through the gap between the cooling core tube 204 and the upper mold shaft core 210, so that the coolant can flow through the side water inlet pipe 213, the gap between the cooling core tube 104 and the upper mold shaft core 105, and the gap between the cooling core tube 104 and the upper mold core tube 103 in sequence, that is, flow from the side water inlet pipe 213 into the inner water inlet channel 205.

[0043] Preferably, the upper mold shaft core 210 is installed together with the upper mold mounting flange 212 through the upper mold nut 211, the upper mold mounting flange 212 is fixed on the upper mold turntable 8 of the injection molding machine, and the cooling core tube 204, the upper mold core tube 203, and the side water inlet pipe 213 are all threadedly connected to the upper mold shaft core 210, so that the cooling core tube 204, the upper mold core tube 203, and the side water inlet pipe 213 are all suspended above the lower mold 1 and the height remains unchanged when the mold is closed.

[0044] Please refer to Figure 4 、 Figure 8 and Figure 9 The side wall of the upper end of the upper mold cooling cylinder core 202 is provided with a cylinder core water inlet hole 2021 and a cylinder core water outlet hole 2022. The cylinder core water inlet hole 2021 and the cylinder core water outlet hole 2022 are respectively connected to the external water inlet channel 207 and the external water channel 208. In addition, the lower end of the return pipe 10 is connected to the cylinder core water inlet hole 2021, and the external water channel 208 is connected to a return water joint 2023 through the cylinder core water outlet hole 2022. The coolant in the return pipe 10 can flow into the external water inlet channel 207 through the cylinder core water inlet hole 1021; the return water joint 2023 is used to connect to the return cooling water circuit of the compression molding machine. The coolant in the external water channel 208 can flow to the return cooling water circuit of the compression molding machine through the cylinder core water outlet hole 1022 and the return water joint 2023 in sequence.

[0045] Please refer to Figure 10The lower mold 1 includes a cavity mounting sleeve 101, which is used to connect the piston rod of the compression molding machine so that the lower mold 1 can move synchronously with the piston rod of the compression molding machine; the lower end of the inner side of the cavity mounting sleeve 101 is sleeved with a lower mold water block 104 and the upper end of the inner side of the cavity mounting sleeve 101 is sleeved with a cooling outer cavity 102 and a cooling inner cavity 103 in sequence from the outside to the inside, wherein the side wall of the cooling outer cavity 102 is penetrated by a plurality of outer cavity channels 1021 and the lower end of the cooling outer cavity 102 is connected to the cooling cavity 103. The cavity mounting sleeve 101 is clearance-fitted to form an annular cavity 1022. A plurality of side cooling channels 7 are arranged around the outer side wall of the cooling inner cavity 103, and the length direction of each side cooling channel 7 is parallel to the axial direction of the cooling inner cavity 103. A plurality of bottom cooling channels 6 are divergently arranged on the bottom surface of the cooling inner cavity 103. A lower mold cover 105 is sandwiched between the lower mold water block 104 and the cooling inner cavity 103. A lower mold water inlet hole 104 is opened on the lower mold water block 104. 1. The lower mold water outlet channel 1042 is used to connect the cooling water supply channel and the cooling water return channel of the compression molding machine respectively; the lower mold cover 105 is provided with a cover through hole 1051, the lower mold water inlet hole 1041, the cover through hole 1051, the bottom cooling channel 6, the side cooling channel 7, the outer cavity channel 1021, the annular cavity 1022, and the lower mold water outlet channel 1042 are connected in sequence. When the coolant flows into the bottom cooling channel 6 through the lower mold water inlet hole 1041 and the cover through hole 1051 in sequence, When the coolant is dispersed in the entire bottom surface of the cooling inner cavity 103, the coolant can cool the bottom surface of the bottle cap 9 from the outside to the inside. When the coolant in the bottom cold channel 6 continues to flow and flows into the cold channels 7 on each side and is evenly distributed in an annular shape on the entire side of the cooling inner cavity 103, the coolant can cool the side surface and the anti-slip groove part of the bottle cap 9 from the outside to the inside, which has a better cooling effect on the bottle cap 9, especially can effectively avoid the problem of tearing when removing the cap, thereby improving the molding quality of the product.

[0046] Please refer to Figure 1 and Figure 2 The present invention also includes an upper mold demoulding mechanism 3, which includes a demoulding guide shaft 303 that can be lifted up and down, and the lower end of the demoulding guide shaft 303 is connected to a demoulding claw 305, and the end of the demoulding claw 305 away from the demoulding guide shaft 303 is connected to a demoulding shell 306, and the demoulding shell 306 is slidably mounted on the outer side of the upper mold shell 201 and the lower end of the demoulding shell 306 can be against the formed bottle cap 9. The demoulding guide shaft 303 is slidably mounted on the upper mold turntable 8 of the injection molding machine. When the demoulding guide shaft 303 moves downward, it can sequentially drive the demoulding claws 305 and the demoulding shell 306 to move downward synchronously, so that the lower end of the demoulding shell 306 can abut against the formed bottle cap 9, and when the demoulding guide shaft 303 moves downward to a preset distance, the demoulding shell 306 can squeeze the bottle cap 9 away from the upper mold shell 201, and the bottle cap 9 falls under the action of gravity, thereby achieving the purpose of the bottle cap 9 being separated from the upper mold 2.

[0047] Please refer to Figure 3 and Figure 4 , the upper mold shell 201 includes a lock nut 2011, a water block 2012, a support sleeve 2013, and an internal thread forming cylinder 2014. The lock nut 2011, the water block 2012, the support sleeve 2013, and the internal thread forming cylinder 2014 are sequentially sleeved on the outer side of the upper mold cooling cylinder core 202 from top to bottom to form a core-removing mechanism that can slide relative to the upper mold core tube 203, wherein the lock nut 2011 and the water block 2012 are fixedly connected to the upper mold cooling cylinder core 202, and the two ends of the support sleeve 2013 are respectively in conflict with the water block 2012 and the internal thread forming cylinder 2014, and the support sleeve 2013 The outer sleeve is provided with an upper mold threaded return spring 2015, the upper end of the upper mold threaded return spring 2015 is connected / interfered with the water block 2012 and the lower end of the upper mold threaded return spring 2015 is connected / interfered with the upper mold shaft sleeve 2016, the upper mold shaft sleeve 2016 is fixedly connected to the upper mold turntable 8 of the injection molding machine, and the upper mold cooling cylinder core 202 is provided with at least one upper mold cooling cylinder core positioning block 2024 for limiting the rotational freedom and axial movement distance of the support sleeve 2013, and at least one upper mold cover internal thread positioning block 2025 for limiting the rotational freedom and axial movement distance of the internal thread forming cylinder 2014.

[0048] Specifically, the internal thread forming cylinder 2014 and the support sleeve 2013 are both provided with a strip side opening of a preset length, and the upper mold cover internal thread positioning block 2025 and the upper mold cooling cylinder core positioning block 2024 respectively extend into the corresponding strip side openings, thereby limiting the rotational freedom and axial movement distance of the internal thread forming cylinder 2014 and the support sleeve 2013.

[0049] The water block 206 is provided with two water holes. The core water inlet 2021 is connected to the return pipe 10 via one of the water holes. The core water outlet 2022 is connected to the return water joint 2023 via the other water hole.

[0050] The upper mold sleeve 2016 is relatively slidably sleeved on the outside of the support sleeve 2013, and the upper mold sleeve 2016 is fixedly connected to the upper mold turntable 8 of the injection molding machine through the upper mold adapter flange 2017, and the upper mold adapter flange 2017 is fixedly connected to the upper mold turntable 8 of the injection molding machine through the locking nut 214.

[0051] The outer side wall of the lower end of the internal thread forming cylinder 2014 is provided with a pattern for forming an internal thread on the inner side wall of the bottle cap 7. When the bottle cap 7 is formed, the bottle cap 7 can be connected to the lower end of the internal thread forming cylinder 2014 through the internal thread. At this time, the demoulding shell 306 needs to move downward to squeeze the bottle cap 9 away from the internal thread forming cylinder 2014 to achieve complete demoulding of the bottle cap 9.

[0052] Please refer to Figures 1 to 5 The demoulding shell 306 includes an inner sleeve 3061 and a large upper mold ejection and reset spring 3062. The inner sleeve 3061 is slidably sleeved on the outer side of the upper mold shell 201 and the outer side of the inner sleeve 3061 is fixedly sleeved with a demoulding device 3063, that is, at the lower end of the upper mold 2, the demoulding device 3063, the inner sleeve 3061, the internal thread forming cylinder 2014, the upper mold cooling cylinder core 202, the upper mold core tube 203, and the cooling core tube 205 are sequentially sleeved from the outside to the inside, and the demoulding device 3063 and the inner sleeve 3061 can move relative to the demoulding device 3063 and the inner sleeve 3061 in the axial direction, and the upper mold cooling cylinder core 202 can move relative to the upper mold core tube 203 in the axial direction;

[0053] The lower end of the demoulding device 3063 can abut against the formed bottle cap 9, and the side wall of the demoulding device 3063 is provided with a clamping groove 3064, and the clamping groove 3064 is clamped with the end of the demoulding claw 305 away from the demoulding guide shaft 303; when the demoulding claw 305 drives the demoulding shell 306 to move downward through the clamping groove 3064, the lower end of the demoulding shell 306 can abut against the formed bottle cap 9 and squeeze the bottle cap 9 downward and off the internal thread molding cylinder 2014;

[0054] The two ends of the upper die ejection and reset large spring 3062 are respectively connected to the inner sleeve 3061 and the upper die shaft sleeve 2016. When the demoulding shell 306 moves axially, the upper die ejection and reset large spring 3062 can drive the demoulding shell 306 to reset.

[0055] In the present invention, the upper mold cover removal mechanism 3 also includes a bearing 301, a guide shaft mounting flange 302, and a demolding spring 304, wherein the bearing 301 is mounted on the demolding guide shaft 303, and the demolding spring 304 is slidably sleeved on the outside of the demolding guide shaft 303, the lower end of the above-mentioned demolding spring 304 is connected / interfered with the upper mold turntable 8 of the injection molding machine and the upper end of the demolding spring 304 is fixedly connected to the demolding guide shaft 303 through a clamp, the guide shaft mounting flange 302 is fixed on the upper mold turntable 8 of the injection molding machine and the bottom surface of the guide shaft mounting flange 302 is interfering with the clamp, and the upper end of the demolding guide shaft 303 is connected to the power mechanism of the injection molding machine through the bearing 301.

[0056] Specifically, the power mechanism of the molding machine is an oil cylinder or an air cylinder or other device that can push the demoulding guide shaft 303 to move axially; a decapping mechanism mounting hole is provided on the molding machine turntable 8, and the demoulding guide shaft 303 is slidably sleeved in the decapping mechanism mounting hole and the two ends of the demoulding guide shaft 303 are respectively exposed at the upper and lower sides of the molding machine turntable 8; the guide shaft mounting flange 302 is slidably sleeved on the outer side of the demoulding guide shaft 303 and the guide shaft mounting flange 302 closes the upper end of the decapping mechanism mounting hole; the demoulding spring 304 and the clamp are both located in the cavity formed by the guide shaft mounting flange 302 closing the decapping mechanism mounting hole, and the demoulding spring 304 and the clamp are both slidably sleeved between the demoulding guide shaft 303 and the decapping mechanism mounting hole.

[0057] After the bottle cap 9 is cooled and formed, the turntable 8 of the compression molding machine rotates and drives the upper mold 2 to move onto the cap receiving plate of the compression molding machine. At this time, the power mechanism of the compression molding machine applies a downward force to the demoulding guide shaft 303, pushing the demoulding guide shaft 303 and the demoulding claw 305 to move downward synchronously and the demoulding spring 304 is compressed. Since the demoulding device 3063 is connected to the demoulding claw 305 through the card slot 3064, the demoulding device 3063 will move downward synchronously under the drive of the demoulding claw 305 until the demoulding device 3063 pushes the bottle cap 9 to separate from the upper mold 2 and fall into the cap receiving plate of the compression molding machine, thereby completing the process of the bottle cap 9 separating from the upper mold 2. Finally, the power mechanism of the compression molding machine stops applying force to the demoulding guide shaft 303, the demoulding spring 304 stretches and resets, and drives the demoulding guide shaft 303 to move upward to the initial position before the mold is closed through the clamp, waiting for the next decapping.

[0058] Working principle:

[0059] When the compression molding machine is running, the cutting knife puts the molten plastic block 9' into the center of the cooling cavity 103 (such as Figure 2 As shown), the piston rod of the compression molding machine pushes the lower mold 1 upwards, closing the lower mold 1 and the upper mold 2 together, and the demoulder 3063 and the inner sleeve 3061 are pushed upwards to a preset height (as shown Figure 1 As shown), at this time, the upper mold ejection reset spring 3062 will be in a compressed working state, and the molten plastic block 9' is pressed into the shape of the bottle cap 9 under the action of pressure.

[0060] During the process of the bottle cap 9 being pressed and formed, the coolant in the cooling water supply path of the compression molding machine flows along the side water inlet pipe 213, the gap between the cooling core tube 104 and the upper mold shaft core 105, and the gap between the cooling core tube 104 and the upper mold core tube 103 to the lower end of the upper mold core tube 103, and performs heat exchange cooling on the bottom surface of the bottle cap 9 from the inside to the outside. After the first heat exchange, the flow direction of the coolant turns back and flows into the cooling core tube 104, and flows along the inner water outlet channel 206 to the upper mold. The upper end of the shaft core 105 enters the return pipe 10, and then flows into the cover wall cooling water channel 5 through the cylinder core water inlet hole 1021 in sequence. The coolant entering the cover wall cooling water channel 5 flows through the external water inlet channel 207, one of the lower cooling water holes 2094, one of the water diversion grooves 2092, one part of the cooling water groove 2091, the annular water groove 2093, and another part of the cooling water groove 2091 in sequence, which can replace the side and internal thread of the bottle cap 9 from the inside to the outside. After heat cooling, the coolant after heat exchange again flows into the outgoing water channel 208 from another water branch trough 2092 and another lower cooling water hole 2094, and then flows to the cooling water return channel of the compression molding machine through the core water outlet 1022 and the return water joint 2023 in sequence; at the same time, the coolant in the cooling water supply channel of the compression molding machine flows into each bottom cooling channel 6 through the lower mold water inlet hole 1041 and the cover surface through hole 1051 through the branch pipeline in sequence and is distributed on the entire bottom surface of the cooling inner cavity 103, which can cool the bottom surface of the bottle cap 9 from the outside to the inside, and then the coolant in the bottom cooling channel 6 flows into the side cooling channels 7 and is equidistantly distributed in a ring shape on the entire side surface of the cooling inner cavity 103, which can cool the side surface and anti-slip groove part of the bottle cap 9 from the outside to the inside, so that the coolant can cool the bottom and side surfaces of the bottle cap 9 from the inside to the outside and from the outside to the inside at the same time, with a large cooling area, a wide cooling range, and more comprehensive cooling, which can effectively shorten the cooling cycle of the product and ensure the molding quality of the product.

[0061] After the bottle cap 9 is cooled and formed, the piston rod of the compression molding machine moves downward with the lower mold 1, and the upper mold 2 and the lower mold 1 are separated. At this time, the upper mold ejection reset spring 3062 is reset, and under the action of the elastic force, the demoulder 3063 and the inner sleeve 3061 move downward and apply a downward force to the bottle cap 9; because the internal thread of the bottle cap 9 after molding clamps the lower end of the internal thread forming cylinder 2014, the demoulder 3063 and the inner sleeve 3061 move downward, and at the same time, the bottle cap 9 drives the core stripping structure (such as the core stripping structure) composed of the anti-loosening nut 2011, the water block 2012, the support sleeve 2013, the internal thread forming cylinder 2014, and the upper mold cooling cylinder core 202. Figure 4 As shown in the figure, the bottle cap 9 moves downward relative to the upper mold core tube 203 until the bottom surface of the bottle cap 9 is separated from the bottom surface of the upper mold core tube 203 and the inner sealing plug ring of the bottle cap 9 is separated from the encirclement of the upper mold core tube 203. At this time, the bottle cap 9 has the conditions for forced removal (as shown in the figure). Figure 5After the mold is removed, the mold guide shaft 303 is pushed downward by the power mechanism of the molding machine, pushing the mold guide shaft 303 and the mold removal claw 305 to move downward synchronously and compressing the mold removal spring 304. Since the mold stripper 3063 and the mold removal claw 305 are connected together, the mold stripper 3063 will move downward again under the drive of the mold removal claw 305 until the mold stripper 3063 pushes the bottle cap 9 out of the mold of the molding machine and reaches the cap receiving plate of the molding machine. Then, the power mechanism of the molding machine stops applying force, the mold removal spring 304 stretches and resets, and drives the mold stripping guide shaft 303 to move upward to the initial position before the mold is closed through the clamp. At the same time, the mold removal spring 211 drives the whole composed of the anti-loosening nut 2011, the water block 2012, the support sleeve 2013, the internal thread forming cylinder 2014, and the upper mold cooling cylinder core 202 as shown in FIG. Figure 4 The core tube 203 of the upper mold moves upward to the initial position before mold closing.

[0062] The above describes the preferred embodiments of the present invention. It should be understood that the present invention is not limited to the above-mentioned specific embodiments, and the devices and structures that are not described in detail should be understood to be implemented in a common manner in the art; any technician familiar with the art can use the above-mentioned disclosed methods and technical contents to make many possible changes and modifications to the technical solutions of the present invention without departing from the scope of the technical solutions of the present invention, or modify them into equivalent embodiments of equivalent changes, which does not affect the essential content of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention that do not depart from the content of the technical solutions of the present invention are still within the scope of protection of the technical solutions of the present invention.

Claims

1. A compression molding die, comprising an upper die (2) and a lower die (1); characterized in that: A cover core cooling water channel (4) and a cover wall cooling water channel (5) are provided inside the upper mold (2); parts of the cover core cooling water channel (4) and the cover wall cooling water channel (5) pass through the lower end of the upper mold (2); and the cover wall cooling water channel (5) is located at the lower end of the upper mold (2) and surrounds the outer side of the cover core cooling water channel (4).

2. A compression molding die according to claim 1, characterized in that: The upper mold (2) includes an upper mold shell (201), and the inner side of the upper mold shell (201) is sequentially sleeved with an upper mold cooling cylinder core (202), an upper mold core tube (203), and a cooling core tube (204) from the outside to the inside, wherein the upper mold core tube (203) and the cooling core tube (204) are clearance-matched to form an inner water inlet channel (205), and the two ends of the upper mold core tube (203) are connected to form an inner water outlet channel (206), and the lower end of the inner water inlet channel (205) is connected to the lower end of the inner water outlet channel (206) to form the cover core. A cooling water channel (4), and an external water inlet channel (207) and an external water outlet channel (208) are provided on the upper mold cooling cylinder core (202), and a wall cooling channel (209) arranged around the outer side wall thereof is provided at the lower end of the upper mold cooling cylinder core (202), and both ends of the wall cooling channel (209) are respectively connected to the external water inlet channel (207) and the external water outlet channel (208) to form the cover wall cooling water channel (5), and the cover wall cooling water channel (5) is connected to the cover core cooling water channel (4) through a return pipe (10).

3. A compression molding die according to claim 2, characterized in that: The wall cooling channel (209) includes a plurality of cooling water grooves (2091), and the plurality of cooling water grooves (2091) are distributed around the outer side wall of the lower end of the upper mold cooling cylinder core (202), and water diversion grooves (2092) are provided on both sides of the outer side wall of the lower end of the upper mold cooling cylinder core (202), and an annular water groove (2093) is provided on the outer side wall of the lower end of the upper mold cooling cylinder core (202), and the annular water groove (2093) is connected to one of the diversion grooves (2092) through a part of the cooling water grooves (2091), and the above-mentioned annular water groove (2093) is connected to the other diversion groove (2092) through another part of the cooling water grooves (2091), and the two diversion grooves (2092) are respectively connected to the external water inlet channel (207) and the external water outlet channel (208) through two lower cooling water holes (2094).

4. A compression molding die according to claim 2 or 3, characterized in that: The upper mold (2) also includes an upper mold shaft core (210) with two ends extending therethrough. The top of the cooling core tube (204) is fixedly sleeved with the upper mold shaft core (210), and the remaining portion of the cooling core tube (204) is clearance-matched with the upper mold shaft core (210). The upper end of the cooling core tube (204) is connected to the return flow pipeline (10) via the upper end of the upper mold shaft core (210). The upper end of the upper mold core tube (203) is fixedly sleeved with the lower end of the upper mold shaft core (210), and the upper mold core tube (203) is connected to the side water inlet pipe (213) via the gap between the cooling core tube (204) and the upper mold shaft core (210).

5. A compression molding die according to claim 2 or 3, characterized in that: The side wall of the upper end of the upper mold cooling cylinder core (202) is provided with a cylinder core water inlet hole (2021) and a cylinder core water outlet hole (2022), and the cylinder core water inlet hole (2021) and the cylinder core water outlet hole (2022) are respectively connected to the external water inlet channel (207) and the external water channel (208), and the lower end of the return pipe (10) is connected to the cylinder core water inlet hole (2021), and the external water channel (208) is connected to a return water joint (2023) through the cylinder core water outlet hole (2022).

6. The compression molding die according to any one of claims 1 to 3, characterized in that: The lower mold (1) includes a mold cavity mounting sleeve (101), the lower end of the inner side of the mold cavity mounting sleeve (101) is provided with a lower mold water block (104), and the upper end of the inner side of the mold cavity mounting sleeve (101) is provided with a cooling outer cavity (102) and a cooling inner cavity (103) in sequence from the outside to the inside, wherein the side wall of the cooling outer cavity (102) is penetrated by a plurality of outer cavity channels (1021), and the lower end of the cooling outer cavity (102) and the mold cavity mounting sleeve (101) are clearance-matched to form an annular cavity (1022), and a plurality of side cooling channels (7) are arranged around the outer side wall of the cooling inner cavity (103), and the length direction of each side cooling channel (7) is aligned with the cooling inner cavity (103). ), a plurality of bottom cooling channels (6) are divergently arranged on the bottom surface of the cooling inner cavity (103), and a lower mold cover surface (105) is sandwiched between the lower mold water dividing block (104) and the cooling inner cavity (103), the lower mold water dividing block (104) is provided with a lower mold water inlet hole (1041) and a lower mold water outlet channel (1042), the lower mold cover surface (105) is provided with a cover surface through hole (1051), and the lower mold water inlet hole (1041), the cover surface through hole (1051), the bottom cooling channel (6), the side cooling channel (7), the outer cavity channel (1021), the annular cavity (1022), and the lower mold water outlet channel (1042) are sequentially connected.

7. The compression molding die according to claim 5, wherein: The upper mold decapping mechanism (3) is also included. The upper mold decapping mechanism (3) includes a demoulding guide shaft (303) that can be lifted up and down. The lower end of the demoulding guide shaft (303) is connected to a demoulding claw (305). The end of the demoulding claw (305) away from the demoulding guide shaft (303) is connected to a demoulding shell (306). The demoulding shell (306) is slidably mounted on the outer side of the upper mold shell (201), and the lower end of the demoulding shell (306) can abut against the formed bottle cap (9).

8. The compression molding die according to claim 7, wherein: The upper mold shell (201) includes a locking nut (2011), a water block (2012), a support sleeve (2013), and an internal thread forming tube (2014), wherein the locking nut (2011), the water block (2012), the support sleeve (2013), and the internal thread forming tube (2014) are sequentially sleeved on the outer side of the upper mold cooling tube core (202) from top to bottom to form a core-removing mechanism capable of sliding relative to the upper mold core tube (203), wherein the locking nut (2011) and the water block (2012) are both fixedly connected to the upper mold cooling tube core (202), and the two ends of the support sleeve (2013) are respectively in contact with the water block (2012) and the internal thread forming tube (2014), and the support sleeve ( The outer sleeve of the upper mold thread return spring (2013) is provided with an upper mold thread return spring (2015), the upper end of the upper mold thread return spring (2015) is connected / interfered with the water gas block (2012) and the lower end of the upper mold thread return spring (2015) is connected / interfered with the upper mold shaft sleeve (2016), the upper mold shaft sleeve (2016) is fixedly connected to the upper mold turntable (8) of the injection molding machine, and the upper mold cooling cylinder core (202) is provided with at least one upper mold cooling cylinder core positioning block (2024) for limiting the rotational freedom and axial movement distance of the support sleeve (2013), and at least one upper mold cover internal thread positioning block (2025) for limiting the rotational freedom and axial movement distance of the internal thread forming cylinder (2014).

9. The compression molding die according to claim 8, wherein: The demoulding shell (306) comprises an inner sleeve (3061) and an upper mold ejection and reset spring (3062), wherein the inner sleeve (3061) is slidably sleeved on the outer side of the upper mold shell (201) and the outer fixed sleeve of the inner sleeve (3061) is provided with a demoulding device (3063), the lower end of the demoulding device (3063) can be abutted against the formed bottle cap (9) and the side wall of the demoulding device (3063) is provided with a card slot (3064), the card slot (3064) is engaged with the end of the demoulding claw (305) away from the demoulding guide shaft (303), and the two ends of the upper mold ejection and reset spring (3062) are respectively connected to the inner sleeve (3061) and the upper mold shaft sleeve (2016).

10. The compression molding die according to claim 5, wherein: The upper mold release mechanism (3) further comprises a bearing (301), a guide shaft mounting flange (302), and a demoulding spring (304), wherein the bearing (301) is arranged at the upper end of the demoulding guide shaft (303), the demoulding spring (304) is slidably sleeved on the outer side of the demoulding guide shaft (303), the lower end of the demoulding spring (304) is connected / collided with the upper mold turntable (8) of the injection molding machine, and the upper end of the demoulding spring (304) is fixedly connected to the demoulding guide shaft (303) through a clamp, the guide shaft mounting flange (302) is fixed on the upper mold turntable (8) of the injection molding machine, and the bottom surface of the guide shaft mounting flange (302) is collided with the clamp, and the upper end of the demoulding guide shaft (303) is connected to the power mechanism of the injection molding machine through the bearing (301).

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