Three-station vertical pipe fitting injection molding mold structure and circulation method

Abstract

The invention belongs to the technical field of injection molds, and discloses a three-station vertical pipe fitting injection molding mold structure and a circulation method.The three-station vertical pipe fitting injection molding mold structure comprises a rotary table, the rotary table is fixedly installed on a vertical injection molding machine and can be driven by a rotary motor to rotate, and the rotary table is provided with three stations which are the injection molding pressure maintaining station, the cooling station and the part taking station. Each station is fixedly provided with one injection mold, and each mold comprises a lower mold set, an upper mold set and a mold opening and closing mechanism. The lower die set is fixed to the rotary disc, the upper die set is connected with the lower die set through the die opening and closing mechanism, and the die opening and closing mechanism is connected with a die opening ejection oil cylinder below the rotary disc through an ejection rod, so that opening and closing of the upper die set are achieved. The three stations can be used for injection molding, cooling and workpiece taking procedures at the same time, and synchronous circulation of the procedures is achieved. Through the vertical structure and the three-station injection molding position design, the production efficiency is remarkably improved, the occupied area of equipment is reduced, automatic operation is achieved, the production cost is reduced, and the three-station injection molding machine is suitable for large-scale production of plastic insert-containing pipe fittings.

Description

Technical Field

[0001] The present invention belongs to the technical field of injection molds, and particularly relates to a three-station vertical pipe fitting injection molding mold structure and a transfer method. Background Art

[0002] Plastic pipe fittings with inserts are a type of pipe connected by plastic with metal material pipe thread inserts, and are system components for plastic pipes to achieve functions such as direction change, flow change, opening and closing, adjustment, disassembly, and maintenance. Plastic pipe fittings with inserts are produced by overmolding injection. From the input of inserts to the output of products, it has to go through a production process of multiple processes such as copper insertion, core insertion, mold closing, injection molding, cooling, mold opening, core pulling, part taking, and resetting. It is a large category of product production with complex processes, long processes, long cycles, and high costs in the plastic pipe manufacturing industry. Currently, plastic pipe fittings with inserts still mainly use horizontal injection molding machines and are produced in combination with other equipment.

[0003] The working process of a horizontal injection molding machine mainly includes the following steps: 1. Raw material heating and plasticization: Driven by the drive system, the screw of the injection molding machine conveys and compacts the plastic from the hopper forward. Under the action of the external heater of the barrel, the shear and friction of the screw and the barrel, the material gradually melts. When the predetermined injection volume is reached, the screw stops rotating and retreats 1.

[0004] 2. Mold closing and locking: The mold closing mechanism pushes the moving template and the moving mold part of the mold to close and lock with the fixed mold part on the fixed template to ensure sufficient clamping force during molding.

[0005] 3. Forward movement of the injection device: After mold closing is completed, the injection seat moves forward to make the nozzle fit perfectly with the main sprue of the mold.

[0006] 4. Injection molding and holding pressure: The injection cylinder pushes the screw forward to inject the molten plastic into the cavity of the mold with sufficient pressure. After injection molding is completed, the injection molding machine will continuously apply a certain pressure until the plastic is completely cooled and solidified to prevent defects caused by plastic shrinkage.

[0007] 5. Cooling: The molten plastic gradually solidifies in the mold to form the final plastic product. The cooling time depends on factors such as the type of plastic, the thickness of the product, and the design of the mold.

[0008] 6. Mold opening and ejection of the product: When the plastic product is completely cooled and solidified, the mold locking mechanism opens the mold and ejects the product from the mold.

[0009] The moving template of the horizontal injection molding machine is fixed on the mold opening and closing mechanism of the injection molding machine and is driven to open and close by the mold opening and closing mechanism. Each action of the injection molding machine can only complete the production of one cycle, and then it resets and starts the production of the next cycle. It is impossible to achieve the simultaneous flow of multiple processes. Since the molded pipe fittings with inserts have a variety of product types and specifications, and the market demand is constantly changing, this production method is inefficient and cannot meet the production requirements. Summary of the Invention

[0010] The purpose of the present invention is to provide a three-station vertical pipe fitting injection molding die structure and a flow method to solve the above technical problems.

[0011] To solve the above technical problems, the specific technical solutions of a three-station vertical pipe fitting injection molding die structure and a flow method of the present invention are as follows: A three-station vertical pipe fitting injection molding die structure includes: a turntable, which is fixedly installed on a vertical injection molding machine and can rotate driven by a rotating motor of the vertical injection molding machine. There are three equally spaced stations on the turntable, namely an injection and holding pressure station, a cooling station, and a part-taking station; an injection mold is fixedly installed on each station, and a corresponding mold opening and ejecting oil cylinder and a pipe fitting ejecting oil cylinder are arranged below each station, which rotate simultaneously with the turntable to realize the mold opening, ejection, and reset of the three injection molds respectively; the injection mold includes a lower mold unit, an upper mold unit, and a mold opening and closing mechanism. The lower mold unit is fixed on the station of the turntable, the upper mold unit is fixed above the lower mold unit through the mold opening and closing mechanism, and the mold opening and closing mechanism passes through the lower part of the turntable through an ejecting rod and is connected to the mold opening and ejecting oil cylinder below the turntable. When the mold opening and ejecting oil cylinder acts, it drives the ejecting rod to eject, realizing the flipping of the mold opening and closing mechanism and thus realizing the opening and closing of the upper mold unit. The three stations work simultaneously to realize the process flow.

[0012] Further, the upper mold unit includes an upper composite plate, an upper mold frame, and an upper cavity. The upper mold frame is fixedly installed on the lower surface of the upper composite plate, and the upper cavity is fixedly installed inside the upper mold frame; the lower mold unit includes a lower mold frame, a lower cavity, mold feet, a lower composite plate, and a core component. The lower composite plate is fixedly installed on the turntable, the mold feet are fixedly installed on the lower composite plate, the lower mold frame is fixedly installed on the mold feet, the lower cavity is fixedly installed inside the lower mold frame, and the core component is installed on both sides of the lower cavity and is slidably connected to the lower mold frame.

[0013] Furthermore, the mold opening and closing mechanism includes a guide plate, a lifting seat, articulated connecting rods, and ejector rods. The guide plate is fixedly installed on the left and right sides of the lower mold set. The lifting seat is installed around the upper part of the lower back plate and the outer periphery of the lower mold frame. Multiple ejector rods pass through the through holes in the turntable and the lower back plate and are fixedly connected to the bottom of the lifting seat. The lower ends of the multiple ejector rods are fixedly connected to the mold opening and ejecting oil cylinder. The upper ends of the articulated connecting rods are axially connected to both sides of the upper mold set, and the lower ends are hingedly connected to both sides of the guide plate and the lifting seat. During mold opening, the mold opening and ejecting oil cylinder pushes the ejector rods upward, driving the lifting seat to rise, thereby driving the articulated connecting rods to rotate and driving the upper mold set to flip over.

[0014] Furthermore, the guide plate is provided with a guide groove. The lower end of the guide groove is a vertical groove extending vertically upward, and the upper end is an inclined groove. The lifting seat includes left and right side plates on both sides and front and rear side plates in the front and rear. The left and right side plates and the front and rear side plates are fixedly connected and enclose the outer periphery of the lower mold frame. The left and right side plates are provided with transverse guide grooves. The upper ends of the articulated connecting rods are fixedly connected to both sides of the upper mold frame through a first pin shaft, and the lower ends are movably connected in the guide groove of the guide plate and the transverse guide grooves of the left and right side plates through a second pin shaft.

[0015] Furthermore, the mold opening and closing mechanism further includes a limiting member and an articulated base. Both ends of the guide plate are provided with sliding grooves. The articulated base is fixed in the sliding groove at the rear end of the guide plate and can slide up and down in the sliding groove. The limiting member is fixed in the sliding groove at the front end of the guide plate and can slide up and down in the sliding groove. The upper end of the articulated base is connected to a connecting rod through a third pin shaft, and the upper end of the connecting rod is fixedly connected to both sides of the rear end of the upper mold frame. During mold opening, the third pin shaft rotates and the connecting rod inclines. The upper end of the limiting member has a notch card slot, and both sides of the front end of the upper mold frame of the upper mold set are provided with a fourth pin shaft. During mold closing, the fourth pin shaft is inserted into the notch card slot of the limiting member to achieve precise alignment.

[0016] Furthermore, there is a through hole between the articulated base and the limiting member, and a clamping member is arranged in the through hole. The clamping member is trapezoidal in reverse, and at least part of the clamping member protrudes from the through hole. The protruding part of the clamping member is an angle of the trapezoid in reverse. Corresponding positions on the inner sides of the left and right side plates of the lifting seat are provided with a first clamping groove matching the inclined surface part of the clamping member. During the rising stage of the lifting seat, the front end of the clamping member is clamped in the first clamping groove of the left and right side plates. The articulated base, the limiting member, and the left and right side plates rise together with the lifting seat under the connection of the clamping member, realizing the overall lifting of the upper mold set.

[0017] Further, the sliding grooves at both ends of the guiding plate are provided with the same second clamping grooves as those inside the left and right side plates. The positions of the second clamping grooves correspond to the highest points of the vertical grooves of the guiding plate. When the upper die set is lifted to the highest position, the position of the clamping member is just aligned with the second clamping groove. At this time, when the lifting seat continues to lift under the action of the mold opening and ejecting oil cylinder, the first clamping groove of the left and right side plates and the clamping member push the clamping member into the second clamping groove of the guiding plate under the action of the inclined surface. The left and right side plates are disengaged from the hinged base and the limiting member, and the hinged base and the limiting member remain stationary. The lifting seat continues to rise, pushing the second pin along the inclined groove of the guiding groove, and the hinged connecting rod rotates to flip and open the upper die set.

[0018] Further, the inner sides of the front and rear ends of the left and right side plates are provided with core-pulling guiding grooves. The core-pulling guiding grooves have a vertical groove at the upper end and an inclined groove at the lower end. The end of the core component is connected with a core-pulling shaft. During the rising process of the lifting seat, both ends of the core-pulling shaft enter the core-pulling guiding grooves. Under the action of the core-pulling guiding grooves, when the upper die set flips, it just enters the inclined groove, realizing the synchronous withdrawal of the core component.

[0019] Further, a thimble mechanism is provided between the lower platen and the lower mold frame. The thimble mechanism is used to eject the product after the product is cooled and solidified. The upper part of the thimble mechanism is connected with the injection runner through a thimble, and the lower part is connected with the thimble plate on the upper surface of the lower platen through a spring reset mechanism. The ejection port in the middle of the lower platen, and the pipe fitting ejection oil cylinder below the turntable ejects the thimble plate through the ejection port to realize the ejection of the pipe fitting product.

[0020] The present invention also discloses a three-station vertical pipe fitting injection molding mold transfer method, including the following steps: Injection and holding pressure station: The empty injection mold rotates 120° to the injection and holding pressure station → the upper die set is locked → injection → holding pressure → the entire injection mold rotates 120° to the cooling station; Cooling station: The entire injection mold rotates 120° to the cooling station → cooling and waiting → the entire injection mold rotates 120° to the part-taking station; Part-taking station: The entire injection mold rotates 120° to the part-taking station → the injection mold is opened and the core is pulled out → the thimble mechanism ejects → part-taking → the thimble mechanism resets → inserts are installed → the injection mold is closed and the core is inserted → the injection mold rotates 120° to the injection and holding pressure station.

[0021] The three-station vertical pipe fitting injection molding mold structure and transfer method of the present invention have the following advantages: Improve production efficiency: By setting three stations (injection and holding pressure station, cooling station, and part-taking station), different processes can be carried out simultaneously at the three stations, realizing the synchronous transfer of injection, cooling, and part-taking, avoiding the limitation that a traditional horizontal injection molding machine can only complete one process each time, greatly shortening the production cycle, and improving the production efficiency.

[0022] Reduce equipment footprint: Due to the vertical structure, the layout of the mold and equipment is more compact, reducing the floor area occupied by the equipment, which is especially suitable for production environments with limited space.

[0023] High degree of automation: Through the rotation of the turntable and the automatic control of the oil cylinder, the automation of operations such as mold opening and closing, ejection, and reset is achieved, reducing manual intervention, lowering the labor intensity of operators, and improving the stability and consistency of production at the same time.

[0024] Precise alignment and mold closing: Through the design of limit parts, hinge bases, and guide grooves, precise alignment of the upper and lower mold units during mold closing is ensured, avoiding mold misalignment or damage, and improving the molding quality of products and the service life of the mold.

[0025] Synchronous core pulling and ejection: During the mold opening process, the core components are synchronously pulled out through the core pulling guide grooves, avoiding the cumbersome steps of separately operating the core pulling in traditional molds. At the same time, the design of the ejector pin mechanism ensures that the product can be ejected quickly and stably after cooling, further improving production efficiency.

[0026] Strong adaptability: This mold structure is suitable for the production of plastic pipe fittings with inserts of various specifications, can meet the production requirements of different products, and has strong market adaptability.

[0027] Energy saving and environmental protection: Since the three workstations work simultaneously, the idling time of the equipment is reduced, energy consumption is lowered, meeting the requirements of green manufacturing and sustainable development.

[0028] Reduce production costs: Through improving production efficiency, reducing manual intervention, and decreasing the floor area occupied by the equipment, the overall production cost is effectively controlled, enhancing the economic benefits of the enterprise.

[0029] In summary, the three-station vertical pipe fitting injection molding mold structure and transfer method of the present invention have significant advantages in improving production efficiency, reducing production costs, and enhancing product quality, and are suitable for large-scale and high-efficiency plastic pipe fitting production. Brief Description of the Drawings

[0030] Figure 1 Schematic diagram of the overall structure of the three-station vertical pipe fitting injection molding mold of the present invention; Figure 2 Schematic diagram of the side angle structure of the injection mold of the present invention; Figure 3 Schematic diagram of the front angle structure of the injection mold of the present invention; Figure 4 Schematic diagram of the back angle structure of the injection mold of the present invention; Figure 5Schematic structural diagram of the open mold state of the injection mold of the present invention; Figure 6 Schematic structural diagram of the guide plate, limit member, and hinge base of the injection mold of the present invention; Figure 7 Schematic cross-sectional structure diagram at the guide plate chute of the injection mold of the present invention; Description of the markings in the figure: 1. Turntable; 11. Injection molding and holding pressure station; 12. Cooling station; 13. Part taking station; 2. Injection mold; 21. Lower mold unit; 211. Lower mold frame; 212. Lower cavity; 213. Mold feet; 214. Lower back plate; 2141. Ejection port; 215. Core assembly; 2151. Core pulling shaft; 22. Upper mold unit; 221. Upper back plate; 222. Upper mold frame; 2221. Pin shaft four; 223. Upper cavity; 224. Injection port; 23. Mold opening and closing mechanism; 231. Guide plate; 2311. Guide groove; 2312. Second clamping groove; 232. Lifting seat; 2321. Left and right side plates; 23211. Horizontal guide groove; 23212. First clamping groove; 23213. Core pulling guide groove; 23214. Reset groove; 2322. Front and rear side plates; 233. Hinge connecting rod; 2331. Pin shaft one; 2332. Pin shaft two; 234. Limit member; 2341. Notch clamping groove; 235. Hinge base; 2351. Pin shaft three; 2352. Connecting rod; 236. Ejection rod; 237. Clamping member; 238. Reset pin. Detailed implementation manners

[0031] In order to better understand the purpose, structure, and function of the present invention, the following further describes in detail the structure and flow method of a three-station vertical pipe fitting injection molding mold of the present invention with reference to the accompanying drawings.

[0032] As Figure 1 shown, a three-station vertical pipe fitting injection molding mold structure of the present invention includes a turntable 1. The turntable 1 is fixedly installed on a vertical injection molding machine and can rotate under the drive of a rotation motor of the vertical injection molding machine. The turntable 1 has three equally spaced stations, namely an injection molding and holding pressure station 11, a cooling station 12, and a part taking station 13. An injection mold 2 is fixedly installed on each station. A corresponding mold opening and ejection oil cylinder and a pipe fitting ejection oil cylinder are arranged below each station and rotate simultaneously with the turntable 1 to respectively realize the mold opening, ejection, and reset of the three injection molds 2. The three stations can simultaneously realize the simultaneous flow of different processes. The injection molding and holding pressure station realizes injection molding and holding pressure, the cooling station realizes the cooling of the pipe fitting, and the part taking station realizes mold opening, part taking, and reset. The three processes can be carried out simultaneously, greatly improving the production efficiency.

[0033] To enable the simultaneous execution of various processes, the injection mold 2 needs to work independently at the same time. Therefore, the mold opening and closing mechanism is set up independently. The injection mold 2 of the present invention includes a lower mold unit 21, an upper mold unit 22, and a mold opening and closing mechanism 23. The lower mold unit 21 is fixed on the working position of the turntable 1. The upper mold unit 22 is fixed above the lower mold unit 21 through the mold opening and closing mechanism 23. The mold opening and closing mechanism 23 passes through the ejector rod below the turntable and is connected to the mold opening ejector oil cylinder below the turntable. When the mold opening ejector oil cylinder acts, it drives the ejector rod to eject, realizing the flipping of the mold opening and closing mechanism and thus realizing the opening and closing of the upper mold unit 22.

[0034] As Figure 2 , 3 , as shown in Figure 4, the upper mold unit 22 includes an upper composite plate 221, an upper mold frame 222, and an upper cavity 223. The upper mold frame 222 is fixedly installed on the lower surface of the upper composite plate 221, and the upper cavity 223 is fixedly installed inside the upper mold frame 222.

[0035] As Figure 3 , 4 , as shown in Figure 5, the lower mold unit 21 includes a lower mold frame 211, a lower cavity 212, mold feet 213, a lower composite plate 214, and a core component 215. The lower composite plate 214 is fixedly installed on the turntable 1, the mold feet 213 are fixedly installed on the lower composite plate 214, the lower mold frame 211 is fixedly installed on the mold feet 213, the lower cavity 212 is fixedly installed inside the lower mold frame 211, and the core component 215 is installed on both sides of the lower cavity 212 and is slidably connected to the lower mold frame 211. A product cavity and an injection runner are formed among the upper cavity 223, the lower cavity 212, and the core component 215. The product cavity forms two rows of multiple pipe fittings products and is connected through the injection runner. There is an injection port 224 above the upper mold unit 22, and the plasticized material is injected through the injection port 224. There is an ejector pin mechanism between the lower composite plate 214 and the lower mold frame 211. The ejector pin mechanism is used to eject the product after the product is cooled and solidified. The upper part of the ejector pin mechanism is connected to the injection runner through an ejector pin, and the lower part is connected to the ejector pin plate on the upper surface of the lower composite plate 214 through a spring return mechanism. There is an ejection port 2141 in the middle of the lower composite plate 214. The pipe fitting ejector oil cylinder below the turntable 1 ejects the pipe fitting product by ejecting against the ejector pin plate through the ejection port 2141. The ejector pin mechanism is a conventional existing structure and will not be described in detail here.

[0036] As Figure 2As shown in the figure, the mold opening and closing mechanism 23 includes a guide plate 231, a lifting seat 232, articulated connecting rods 233, a limiting member 234, an articulated base 235, and an ejector rod 236. The guide plate 231 is fixedly installed on the left and right sides of the lower die set 21. The lifting seat 232 is installed around the upper part of the lower back plate 214 and the outer periphery of the lower die frame 211. Four ejector rods 236 pass through the through holes on the turntable 1 and the lower back plate 214 and are fixedly connected to the bottom of the lifting seat 232. The lower ends of the four ejector rods 236 are fixedly connected to the mold opening ejector oil cylinder. The upper ends of the articulated connecting rods 233 are axially connected to both sides of the upper die set 22, and the lower ends are articulated to both sides of the guide plate 231 and the lifting seat 232. When opening the mold, the mold opening ejector oil cylinder pushes the ejector rod 236 upward, driving the lifting seat 232 to rise, thereby driving the articulated connecting rod 233 to rotate and driving the upper die set 22 to flip.

[0037] Specifically, as Figure 6 shown in the figure, the guide plate 231 has a guide groove 2311. The lower end of the guide groove 2311 is a vertical groove extending vertically upward, and the upper end is an inclined groove. The lifting seat 232 includes left and right side plates 2321 on both sides and front and rear side plates 2322 in the front and rear. The left and right side plates 2321 and the front and rear side plates 2322 are fixedly connected and enclose the outer periphery of the lower die frame 211. The left and right side plates 2321 have transverse guide grooves 23211. The upper ends of the articulated connecting rods 233 are fixedly connected to both sides of the upper die frame 222 through a pin shaft 2331, and the lower ends are movably connected to the guide groove 2311 of the guide plate 231 and the transverse guide grooves 23211 of the left and right side plates 2321 through a pin shaft 2332. In the mold closing state, the pin shaft 2332 is at the bottom of the guide groove 2311 and one end of the transverse guide groove 23211. When opening the mold, as the lifting seat 232 rises, the pin shaft 2332 vertically rises upward from the bottom along the guide groove 2311, and then enters the inclined groove of the guide groove 2311, causing the bottom of the articulated connecting rod 233 to tilt to one side. The pin shaft 2332 slides to the other end of the transverse guide groove 23211. At this time, the tilt of the articulated connecting rod 233 causes the upper die set 22 axially connected thereto to flip to one side.

[0038] Both ends of the guide plate 231 have sliding grooves. The articulated base 235 is fixed in the sliding groove at the rear end of the guide plate 231 and can slide up and down in the sliding groove; the limiting member 234 is fixed in the sliding groove at the front end of the guide plate 231 and can slide up and down in the sliding groove. The upper end of the articulated base 235 is connected to a connecting rod 2352 through a pin shaft 2351, and the upper end of the connecting rod 2352 is fixedly connected to both sides of the rear end of the upper die frame 222. When opening the mold, the pin shaft 2351 rotates and the connecting rod 2352 tilts.

[0039] As Figure 4As shown in the figure, the upper end of the position-limiting member 234 has a notch card slot 2341. On both sides of the front end of the upper die frame 222 of the upper die set 22, there are pin shafts four 2221. During mold closing, the pin shafts four 2221 are snapped into the notch card slot 2341 of the position-limiting member 234 to achieve precise alignment.

[0040] As Figure 6 , 7 As shown in the figure, there is a through hole between the hinged base 235 and the position-limiting member 234. A clamping member 237 is arranged in the through hole. The clamping member 237 is trapezoidal in reverse. At least part of the clamping member 237 is exposed from the through hole. The exposed part of the clamping member 237 is an angle of the trapezoid in reverse (the upper surface is a horizontal plane and the lower surface is an inclined plane). At the corresponding positions on the inner sides of the left and right side plates 2321 of the lifting seat 232, there is a first clamping groove 23212 matching the inclined plane part of the clamping member 237. During the rising stage of the lifting seat 232, the front end of the clamping member 237 is clamped in the first clamping groove 23212 of the left and right side plates 2321. The hinged base 235 and the position-limiting member 234 rise together with the left and right side plates 2321 under the connection of the clamping member 237, realizing the overall lifting of the upper die set 22.

[0041] In the sliding grooves at both ends of the guide plate 231, there is a second clamping groove 2312 same as that in the left and right side plates 2321. The position of the second clamping groove 2312 corresponds to the highest point of the vertical groove of the guide plate 231. When the upper die set 22 is lifted to the highest position (that is, when the pin shaft two 2332 is located at the highest point of the vertical groove), at this time, the position of the clamping member 237 just aligns with the second clamping groove 2312. At this time, when the lifting seat 232 continues to rise under the action of the mold-opening ejecting oil cylinder, the first clamping groove 23212 of the left and right side plates 2321 and the clamping member 237 push the clamping member 237 into the second clamping groove 2312 of the guide plate 231 under the action of the inclined plane. The left and right side plates 2321 are disconnected from the hinged base 235 and the position-limiting member 234. The hinged base 235 and the position-limiting member 234 remain stationary. The lifting seat 232 continues to rise, pushing the pin shaft two 2332 to slide along the inclined groove of the guide groove 2311, and the hinged connecting rod 233 rotates to flip and open the upper die set 22.

[0042] As Figure 2 , 5 As shown in the figure, on the inner sides of the front and rear ends of the left and right side plates 2321, there are core-pulling guide grooves 23213. The core-pulling guide grooves 23213 are vertical grooves at the upper end and inclined grooves at the lower end. The end of the core component 215 is connected with a core-pulling shaft 2151. During the rising process of the lifting seat 232, both ends of the core-pulling shaft 2151 enter the core-pulling guide grooves 23213. Under the action of the core-pulling guide grooves 23213, when the upper die set 22 flips, it just enters the inclined groove, realizing the synchronous extraction of the core component 215.

[0043] After mold opening, the pipe fitting ejection oil cylinder ejects against the ejector pin mechanism through the through hole between the turntable 1 and the lower composite plate 214, ejects the product, and waits for the robotic arm to grab it. After the robotic arm grabs it, the pipe fitting ejection oil cylinder retracts, and the ejector pin mechanism resets under the action of the spring reset mechanism. The mold opening ejection oil cylinder retracts, driving the ejection rod 236 to pull down and reset. The bottom of the left and right side plates 2321 has a reset groove 23214, and the bottom of the hinge base 235 and the limit piece 234 has a reset pin 238. During reset, the left and right side plates 2321 descend. When the reset groove 23214 catches the reset pin 238, it drives the hinge base 235 and the limit piece 234 to descend together. At this time, the engaging piece 237 in the second engaging groove 2312 disengages from the guide plate 231 under the action of the inclined surface and snaps into the first engaging groove 23212. The mold opening ejection oil cylinder continues to retract until the lifting seat 232, the hinge base 235, and the limit piece 234 reach the bottommost position, and the upper mold set 22 closes the mold, and the core subassembly 215 resets synchronously.

[0044] The three-station vertical pipe fitting injection molding die flow method of the present invention includes the following steps: Injection and holding pressure station 11: The empty injection mold 2 rotates 120° to the injection and holding pressure station 11 → the upper mold set 22 locks the mold → injection → holding pressure → the entire injection mold 2 rotates 120° to the cooling station 12; Cooling station 12: The entire injection mold 2 rotates 120° to the cooling station 12 → cooling and waiting → the entire injection mold 2 rotates 120° to the part-taking station 13; Part-taking station 13: The entire injection mold 2 rotates 120° to the part-taking station 13 → the injection mold 2 opens the mold and core pulls out → the ejector pin mechanism ejects → part-taking → the ejector pin mechanism resets → inserts are installed → the injection mold 2 closes the mold and core enters → the injection mold 2 rotates 120° to the injection and holding pressure station 11.

[0045] The three stations work simultaneously to realize the process flow, greatly improving the production efficiency of plastic pipe fittings with inserts.

[0046] It can be understood that the present invention is described through some embodiments. Those skilled in the art know that without departing from the spirit and scope of the present invention, various changes or equivalent replacements can be made to these features and embodiments. In addition, under the teaching of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application belong to the scope protected by the present invention.

Claims

1. A three-station vertical pipe fitting injection molding mold structure, characterized in that: include: A turntable (1) is fixedly mounted on a vertical injection molding machine and can rotate under the drive of a rotary motor of the vertical injection molding machine. The turntable (1) has three equally spaced workstations, namely an injection pressure holding workstation (11), a cooling workstation (12) and a piece removal workstation (13). An injection mold (2) is fixedly mounted on each workstation. A corresponding mold opening and ejection oil cylinder and a pipe ejection oil cylinder are arranged below each workstation and rotate simultaneously with the turntable (1) to respectively realize mold opening, ejection and reset of the three injection molds (2). The injection mold (2) comprises a lower mold assembly (2 1), an upper die set (22) and a die opening and closing mechanism (23), the lower die set (21) being fixed on a workstation of a turntable (1), the upper die set (22) being fixed above the lower die set (21) via the die opening and closing mechanism (23), the die opening and closing mechanism (23) passing through the bottom of the turntable (1) via an ejector rod (236) and connected to a die opening and ejection oil cylinder below the turntable (1), the action of the die opening and ejection oil cylinder drives the ejector rod (236) to eject, thereby realizing the flipping of the die opening and closing mechanism (23) and thus realizing the opening and closing of the upper die set (22), the three workstations working simultaneously, realizing process flow.

2. The three-station vertical pipe fitting injection molding mold structure according to claim 1 is characterized in that: The upper mold assembly (22) comprises an upper composite plate (221), an upper mold frame (222), and an upper mold cavity (223); the upper mold frame (222) is fixedly mounted on the lower surface of the upper composite plate (221); and the upper mold cavity (223) is fixedly mounted inside the upper mold frame (222); the lower mold assembly (21) comprises a lower mold frame (211), a lower mold cavity (212), a mold foot (213), a lower composite plate (214), and a core assembly (215); the lower composite plate (214) is fixedly mounted on the turntable (1); the mold foot (213) is fixedly mounted on the lower composite plate (214); the lower mold frame (211) is fixedly mounted on the mold foot (213); the lower mold cavity (212) is fixedly mounted inside the lower mold frame (211); and the core assembly (215) is mounted on both sides of the lower mold cavity (212) and is slidably connected to the lower mold frame (211).

3. The three-station vertical pipe fitting injection molding mold structure according to claim 2 is characterized in that: The mold opening and closing mechanism (23) comprises a guide plate (231), a lifting seat (232), a hinged connecting rod (233), and an ejector rod (236); the guide plate (231) is fixedly mounted on the left and right sides of the lower mold assembly (21); the lifting seat (232) is mounted around the top of the lower composite plate (214) and the outer periphery of the lower mold frame (211); a plurality of ejector rods (236) pass through the through holes on the turntable (1) and the lower composite plate (214) and are connected to the lifting seat (236). The upper end of the hinged connecting rod (233) is connected to the shafts on both sides of the upper mold assembly (22), and the lower end is hingedly connected to the guide plate (231) and the lifting seat (232) on both sides. When the mold is opened, the mold opening ejection cylinder pushes the ejection rod (236) upward, driving the lifting seat (232) to rise, thereby driving the hinged connecting rod (233) to rotate, and driving the upper mold assembly (22) to flip.

4. The three-station vertical pipe fitting injection molding mold structure according to claim 3 is characterized in that: The guide plate (231) has a guide groove (2311), the lower end of the guide groove (2311) is a vertical groove extending vertically upward, and the upper end is an inclined groove. The lifting seat (232) comprises left and right side plates (2321) on both sides and front and rear side plates (2322) on both sides. The left and right side plates (2321) and the front and rear side plates (2322) are fixedly connected and enclosed around the outer periphery of the lower mold frame (211). The left and right side plates (2321) have transverse guide grooves (23211). The upper end of the hinged connecting rod (233) is fixedly connected to both sides of the upper mold frame (222) through a pin shaft 1 (2331), and the lower end is movably connected to the guide groove (2311) of the guide plate (231) and the transverse guide grooves (23211) of the left and right side plates (2321) through a pin shaft 2 (2332).

5. The three-station vertical pipe fitting injection molding mold structure according to claim 4 is characterized in that: The mold opening and closing mechanism (23) further comprises a limiter (234) and an articulated base (235); both ends of the guide plate (231) have slide grooves; the articulated base (235) is fixed in the slide groove at the rear end of the guide plate (231) and can slide up and down in the slide groove; the limiter (234) is fixed in the slide groove at the front end of the guide plate (231) and can slide up and down in the slide groove; the upper end of the articulated base (235) is connected to a connecting rod (231) via a pin shaft (2351). 52), the upper end of the connecting rod (2352) is fixedly connected to both sides of the rear end of the upper mold frame (222); when the mold is opened, the pin shaft three (2351) rotates and the connecting rod (2352) tilts; the upper end of the limiting member (234) has a notch slot (2341), and both sides of the front end of the upper mold frame (222) of the upper mold assembly (22) have pin shaft four (2221); when the mold is closed, the pin shaft four (2221) is snapped into the notch slot (2341) of the limiting member (234) to achieve precise alignment.

6. The three-station vertical pipe fitting injection molding mold structure according to claim 5 is characterized in that: A through hole is provided between the hinged base (235) and the limiting member (234), and a clamping member (237) is provided in the through hole. The clamping member (237) is in an inverted trapezoidal shape, and at least a portion of the clamping member (237) is exposed from the through hole. The exposed portion of the clamping member (237) is a corner of the inverted trapezoidal shape. The corresponding positions on the inner sides of the left and right side plates (2321) of the lifting seat (232) are provided with a clamping groove 1 (23212) matching the inclined surface portion of the clamping member (237). In the lifting stage of the lifting seat (232), the front end of the clamping member (237) is clamped in the clamping groove 1 (23212) of the left and right side plates (2321). The hinged base (235) and the limiting member (234) are connected with the left and right side plates (2321) and rise together with the lifting seat (232) through the connection of the clamping member (237), thereby realizing the overall lifting of the upper mold assembly (22).

7. The three-station vertical pipe fitting injection molding mold structure according to claim 6 is characterized in that: The guide plate (231) has a second clamping groove (2312) in the sliding grooves at both ends thereof, which is the same as that in the left and right side plates (2321). The position of the second clamping groove (2312) corresponds to the highest point of the vertical groove of the guide plate (231). When the upper mold assembly (22) is lifted to the highest position, the position of the clamping member (237) is just aligned with the second clamping groove (2312). At this time, when the lifting seat (232) continues to lift under the action of the mold opening and ejecting cylinder, the first clamping groove (23212) of the left and right side plates (2321) is ) and the clamping member (237) push the clamping member (237) into the second clamping groove (2312) of the guide plate (231) under the action of the inclined surface, and the left and right side plates (2321) are disconnected from the hinge base (235) and the limit member (234). The hinge base (235) and the limit member (234) remain stationary, and the lifting seat (232) continues to rise, pushing the second pin shaft (2332) to slide along the inclined groove of the guide groove (2311), and the hinge connecting rod (233) rotates to flip the upper mold assembly (22) to open.

8. The three-station vertical pipe fitting injection molding mold structure according to claim 7 is characterized in that: The inner sides of the front and rear ends of the left and right side plates (2321) are provided with core pulling guide grooves (23213), the upper end of the core pulling guide grooves (23213) being a vertical groove and the lower end being an inclined groove. The end of the core assembly (215) is connected with a core pulling shaft (2151), and during the rising process of the lifting seat (232), both ends of the core pulling shaft (2151) enter into the core pulling guide grooves (23213), and under the action of the core pulling guide grooves (23213), when the upper mold assembly (22) is turned over, the core assembly (215) just enters the inclined groove, thereby realizing the synchronous withdrawal of the core assembly (215).

9. The three-station vertical pipe fitting injection molding mold structure according to claim 3 is characterized in that: An ejector mechanism is provided between the lower composite plate (214) and the lower mold frame (211), and is used to eject the product after the product has been cooled and shaped. The ejector mechanism is connected to the injection molding runner via an ejector at the top, and is connected to the ejector plate on the upper surface of the lower composite plate (214) via a spring return mechanism at the bottom. The ejector outlet (2141) in the middle of the lower composite plate (214) and the pipe ejection cylinder below the turntable (1) push against the ejector plate via the ejector outlet (2141) to eject the pipe product.

10. A three-station vertical pipe fitting injection molding mold circulation method, characterized in that: The following steps are involved: Injection and pressure holding station (11): the empty injection mold (2) is rotated 120° to the injection and pressure holding station (11) → the upper mold assembly (22) is clamped → injection → pressure holding → the entire injection mold (2) is rotated 120° to the cooling station (12); Cooling station (12): the entire injection mold (2) rotates 120° to the cooling station (12) → cooling and waiting → the entire injection mold (2) rotates 120° to the removal station (13); Removal station (13): The entire injection mold (2) rotates 120° to the removal station (13) → the injection mold (2) opens and cores out → ejector mechanism ejects → removal → ejector mechanism resets → inserts are installed → the injection mold (2) closes and cores are inserted → the injection mold (2) rotates 120° to the injection pressure holding station (11).

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