A three-station vertical pipe fitting injection molding mold structure and flow method

Abstract

The present invention belongs to the technical field of injection molds, and discloses a three-station vertical pipe fitting injection molding mold structure and circulation method, including a turntable, which is fixedly installed on a vertical injection molding machine and can be rotated by a rotating motor. The turntable is provided with three stations, namely an injection pressure holding station, a cooling station and a pickup station. An injection mold is fixedly installed on each station, and the mold includes a lower mold group, an upper mold group and a mold opening and closing mechanism. The lower mold group is fixed on the turntable, and the upper mold group is connected to the lower mold group through the mold opening and closing mechanism. The mold opening and closing mechanism is connected to the mold opening and ejection cylinder below the turntable through the ejection rod to realize the opening and closing of the upper mold group. The three stations can perform injection molding, cooling and pickup processes simultaneously, realizing the synchronous flow of the processes. The present invention significantly improves production efficiency, reduces the equipment footprint, realizes automated operation, and reduces production costs through the vertical structure and three-station injection molding design. It is suitable for large-scale production of plastic pipe fittings containing inserts.

Description

Technical Field

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

[0002] Plastic pipe fittings with inserts are a type of pipe connected using threaded inserts made of plastic and metal. They are system components that enable plastic pipes to change direction, flow, open and close, adjust, assemble and disassemble, and perform maintenance. Plastic pipe fittings with inserts are produced using overmolding. From insert input to product output, the production process involves multiple steps, including copper insertion, core insertion, mold closing, injection molding, cooling, mold opening, core extraction, component removal, and resetting. This makes them a particularly complex product category in the plastic pipe manufacturing industry, characterized by lengthy processes, long cycle times, and high costs. Currently, the production of plastic pipe fittings with inserts relies primarily on horizontal injection molding machines, supplemented by other equipment.

[0003] The working process of the horizontal injection molding machine mainly includes the following steps:

[0004] 1. Raw material heating and plasticization: Driven by the drive system, the injection molding machine's screw conveys and compacts the plastic from the hopper. The material gradually melts due to the shearing and friction between the external heater, screw, and barrel. When the desired injection volume is reached, the screw stops and retreats.

[0005] 2. Clamp and lock the mold: The clamping mechanism pushes the movable platen and the movable mold part of the mold to close and lock the mold with the fixed mold part on the fixed platen to ensure sufficient clamping force during molding.

[0006] 3. Move the injection molding device forward: After the mold is closed, the injection molding seat moves forward so that the nozzle is completely aligned with the main runner gate of the mold.

[0007] 4. Injection and Pressure Holding: The injection cylinder pushes the screw forward, injecting the molten plastic into the mold cavity with sufficient pressure. After injection, the machine continues to apply pressure until the plastic completely cools and solidifies to prevent shrinkage and defects.

[0008] 5. Cooling: The molten plastic gradually solidifies in the mold, forming 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.

[0009] 6. Mold opening and product ejection: When the plastic product is completely cooled and solidified, the clamping mechanism opens the mold and ejects the product from the mold.

[0010] The movable platen of the horizontal injection molding machine is fixed on the mold opening and closing mechanism of the injection molding machine. The mold opening and closing mechanism drives the injection molding machine to open and close. Each action of the injection molding machine can only complete one cycle of production, and then reset to restart the next cycle of production. It is impossible to achieve the simultaneous flow of multiple processes. Since the molded products containing inserts are of various varieties and specifications and the market demand is constantly changing, this production method is inefficient and cannot meet production needs. Summary of the Invention

[0011] The object of the present invention is to provide a three-station vertical pipe fitting injection molding mold structure and a circulation method to solve the above-mentioned technical problems.

[0012] In order to solve the above technical problems, the specific technical solutions of the three-station vertical pipe fitting injection molding mold structure and flow method of the present invention are as follows:

[0013] A three-station vertical pipe fitting injection molding mold structure includes: a turntable, which is fixedly installed on a vertical injection molding machine and can rotate under the rotation motor of the vertical injection molding machine. The turntable has three equidistantly distributed stations, namely, an injection pressure holding station, a cooling station and a piece removal station; an injection mold is fixedly installed on each station, and a corresponding mold opening and ejection oil cylinder and a pipe fitting ejection oil cylinder are provided under each station, which rotate simultaneously with the turntable to respectively realize the mold opening, ejection and reset of the three injection molds; the injection mold includes a lower mold group, an upper mold group and a mold opening and closing mechanism, the lower mold group is fixed on the work station of the turntable, and the upper mold group is fixed above the lower mold group through the mold opening and closing mechanism, the mold opening and closing mechanism passes through the bottom of the turntable through the ejection rod and is connected to the mold opening and ejection oil cylinder under the turntable, the mold opening and ejection oil cylinder drives the ejection rod to eject, realizes the flipping of the mold opening and closing mechanism, and thus realizes the opening and closing of the upper mold group, the three stations work simultaneously, and realizes the process flow.

[0014] Furthermore, the upper mold group 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 group includes a lower mold frame, a lower cavity, a mold foot, a lower composite plate and a core assembly. The lower composite plate is fixedly installed on the turntable, the mold foot is fixedly installed on the lower composite plate, the lower mold frame is fixedly installed on the mold foot, the lower cavity is fixedly installed in the lower mold frame, and the core assembly is installed on both sides of the lower cavity and is slidably connected to the lower mold frame.

[0015] Furthermore, the mold opening and closing mechanism includes a guide plate, a lifting seat, a hinged connecting rod, and an ejector rod. The guide plates are fixedly installed on the left and right sides of the lower mold group, and the lifting seat is installed around the top of the lower composite plate and the outer periphery of the lower mold frame. Multiple ejector rods pass through the through holes on the turntable and the lower composite plate and are fixedly connected to the bottom of the lifting seat. The lower ends of multiple ejector rods are fixedly connected to the mold opening ejection cylinder; the upper ends of the hinged connecting rods are connected to the shafts on both sides of the upper mold group, and the lower ends are hingedly connected to the guide plates and both sides of the lifting seat. When the mold is opened, the mold opening ejection cylinder pushes the ejector rod upward, driving the lifting seat to rise, thereby driving the hinged connecting rod to rotate, and driving the upper mold group to flip.

[0016] Furthermore, the guide plate is provided with a guide groove, the lower end of the guide groove is a vertical groove pointing vertically upward, and the upper end is an inclined groove, the lifting seat includes left and right side panels on both sides and front and rear side panels, the left and right side panels and the front and rear side panels are fixedly connected and enclosed on the outer periphery of the lower mold frame; the left and right side panels are provided with transverse guide grooves, the upper end of the hinged connecting rod is fixedly connected to the two sides of the upper mold frame by pin shaft 1, and the lower end is movably connected to the guide groove of the guide plate and the transverse guide grooves of the left and right side panels by pin shaft 2.

[0017] Furthermore, the mold opening and closing mechanism also includes a limit piece and an articulated base. Both ends of the guide plate have a slide groove. The articulated base is fixed in the slide groove at the rear end of the guide plate and can slide up and down in the slide groove; the limit piece is fixed in the slide groove at the front end of the guide plate and can slide up and down in the slide groove; the upper end of the articulated base is connected to a connecting rod through a third pin, and the upper end of the connecting rod is fixedly connected to both sides of the rear end of the upper mold frame. When the mold is opened, the third pin rotates and the connecting rod tilts; the upper end of the limit piece has a notch slot, and the two sides of the front end of the upper mold frame of the upper mold group have a fourth pin. When the mold is closed, the fourth pin is inserted into the notch slot of the limit piece to achieve precise alignment.

[0018] Furthermore, there is a through hole between the hinged base and the limiter, and a clip is provided in the through hole. The clip is in an inverted trapezoid, and the clip is at least partially exposed in the through hole. The exposed portion of the clip is a corner of the inverted trapezoid. The corresponding positions on the inner sides of the left and right side panels of the lifting seat have a clipping groove 1 that matches the inclined portion of the clip. During the rising stage of the lifting seat, the front end of the clip is clipped in the clipping groove 1 of the left and right side panels. The hinged base and the limiter rise together with the left and right side panels under the connection of the clip, thereby realizing the overall lifting of the upper module.

[0019] Furthermore, the sliding grooves at both ends of the guide plate are provided with a second clamping groove which is the same as that in the left and right side plates. The position of the second clamping groove corresponds to the highest point of the vertical groove of the guide plate. When the upper mold assembly is lifted to the highest position, the position of the clamping part 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 clamping grooves 1 of the left and right side plates and the clamping part push the clamping part into the second clamping groove of the guide plate under the action of the inclined surface. The left and right side plates are disconnected from the hinge base and the limiter, the hinge base and the limiter remain stationary, and the lifting seat continues to rise, pushing the pin shaft 2 to slide along the oblique groove of the guide groove, and the hinged connecting rod rotates to flip the upper mold assembly open.

[0020] Furthermore, the inner sides of the front and rear ends of the left and right side plates are provided with core-pulling guide grooves, the upper end of the core-pulling guide grooves are vertical grooves, and the lower end is an inclined groove. The end of the core assembly is connected to a core-pulling shaft. During the rising process of the lifting seat, both ends of the core-pulling shaft enter the core-pulling guide grooves. Under the action of the core-pulling guide grooves, the core assembly enters the inclined grooves when the upper mold assembly is flipped, thereby realizing the synchronous extraction of the core assembly.

[0021] Furthermore, an ejector mechanism is provided between the lower composite plate and the lower mold frame, and the ejector mechanism is used to eject the product after the product is cooled and shaped. The upper part of the ejector mechanism is connected to the injection molding runner through an ejector, and the lower part is connected to the ejector plate on the upper surface of the lower composite plate through a spring return mechanism. The ejector outlet in the middle of the lower composite plate and the pipe ejection cylinder below the turntable push against the ejector plate through the ejector outlet to eject the pipe product.

[0022] The present invention also discloses a three-station vertical pipe fitting injection molding mold circulation method, comprising the following steps:

[0023] Injection and pressure holding station: The empty injection mold rotates 120° to the injection and pressure holding station → clamp the upper mold assembly → injection → pressure holding → the entire injection mold rotates 120° to the cooling station;

[0024] Cooling station: The entire injection mold rotates 120° to the cooling station → cooling and waiting → the entire injection mold rotates 120° to the removal station;

[0025] Part removal station: The entire injection mold rotates 120° to the part removal station → injection mold opens and cores are pulled → ejector mechanism ejects → part is removed → ejector mechanism resets → insert is installed → injection mold closes and cores are fed → injection mold rotates 120° to the injection holding pressure station.

[0026] The three-station vertical pipe fitting injection molding die structure and flow method of the present invention have the following advantages:

[0027] Improve production efficiency: By setting up three workstations (injection molding and pressure holding station, cooling station and pick-up station), the three workstations can carry out different processes at the same time, realizing the synchronous flow of injection molding, cooling and pick-up, avoiding the limitation of traditional horizontal injection molding machines that can only complete one process at a time, greatly shortening the production cycle and improving production efficiency.

[0028] Reduce equipment space occupation: Due to the adoption of vertical structure, the layout of mold and equipment is more compact, which reduces the equipment footprint and is particularly suitable for production environments with limited space.

[0029] High degree of automation: Through the rotation of the turntable and the automatic control of the oil cylinder, the opening and closing, ejection, and reset of the mold are automated, which reduces manual intervention and the labor intensity of operators, while improving the stability and consistency of production.

[0030] Precise alignment and mold closing: The design of limiters, articulated bases and guide grooves ensures precise alignment of the upper and lower mold assemblies during mold closing, avoiding mold misalignment or damage, and improving product molding quality and mold service life.

[0031] Synchronous core pulling and ejection: During the mold opening process, the core assembly is synchronously pulled out through the core pulling guide groove, avoiding the tedious steps of separate core pulling required in traditional molds. At the same time, the design of the ejector mechanism ensures that the product can be ejected quickly and stably after cooling, further improving production efficiency.

[0032] Strong adaptability: This mold structure is suitable for the production of various specifications of plastic pipe fittings containing inserts, can meet the production needs of different products, and has strong market adaptability.

[0033] Energy saving and environmental protection: Since the three workstations work at the same time, the idling time of the equipment is reduced, energy consumption is reduced, and it meets the requirements of green manufacturing and sustainable development.

[0034] Reduce production costs: By improving production efficiency, reducing manual intervention and reducing equipment footprint, the overall production costs have been effectively controlled, improving the company's economic benefits.

[0035] In summary, the three-station vertical pipe fitting injection molding mold structure and flow method of the present invention have significant advantages in improving production efficiency, reducing production costs, and improving product quality, and are suitable for large-scale, high-efficiency production of plastic pipe fittings. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a schematic diagram of the overall structure of the three-station vertical pipe fitting injection molding mold of the present invention;

[0037] Figure 2This is a schematic diagram of the side angle structure of the injection mold of the present invention;

[0038] Figure 3 This is a schematic diagram of the front angle structure of the injection mold of the present invention;

[0039] Figure 4 This is a schematic diagram of the back angle structure of the injection mold of the present invention;

[0040] Figure 5 This is a structural schematic diagram of the injection mold of the present invention in the mold opening state;

[0041] Figure 6 This is a schematic structural diagram of the guide plate, limiter, and hinged base of the injection mold of the present invention;

[0042] Figure 7 Schematic diagram of the cross-sectional structure of the guide plate slide groove of the injection mold of the present invention;

[0043] Explanation of the markings in the figure: 1. Turntable; 11. Injection molding and holding pressure station; 12. Cooling station; 13. Pick-up station; 2. Injection mold; 21. Lower mold assembly; 211. Lower mold frame; 212. Lower cavity; 213. Mold foot; 214. Lower plate; 2141. Ejector outlet; 215. Core assembly; 2151. Mandrel; 22. Upper mold assembly; 221. Upper plate; 222. Upper mold frame; 2221. Pin 4; 223. Upper cavity; 224. Injection port; 23. Mold opening and closing mechanism; 231. Guide plate; 2311. Guide plate 2312, snap-fit slot 2; 232, lifting seat; 2321, left and right side panels; 23211, horizontal guide groove; 23212, snap-fit slot 1; 23213, core-pulling guide groove; 23214, reset groove; 2322, front and rear side panels; 233, hinged connecting rod; 2331, pin 1; 2332, pin 2; 234, limiter; 2341, notch snap-fit slot; 235, hinged base; 2351, pin 3; 2352, connecting rod; 236, ejector rod; 237, snap-fit member; 238, reset pin. DETAILED DESCRIPTION

[0044] In order to better understand the purpose, structure and function of the present invention, the following is a further detailed description of the three-station vertical pipe fitting injection molding mold structure and flow method of the present invention in conjunction with the accompanying drawings.

[0045] like Figure 1As shown, a three-station vertical pipe fitting injection molding mold structure of the present invention includes a turntable 1, which is fixedly mounted on a vertical injection molding machine and can be rotated by the rotary motor of the vertical injection molding machine. The turntable 1 has three equidistantly distributed stations, namely an injection molding and pressure holding station 11, a cooling station 12 and a pickup station 13. An injection mold 2 is fixedly mounted on each station, and a corresponding mold opening and ejection oil cylinder and a pipe fitting ejection oil cylinder are provided under each station. They rotate simultaneously with the turntable 1 to realize the mold opening, ejection and reset of the three injection molds 2 respectively. The three stations can realize the simultaneous flow of different processes at the same time. The injection molding and pressure holding station realizes injection molding and pressure holding, the cooling station realizes cooling of the pipe fitting, and the pickup station realizes mold opening, pickup and reset. The three processes can be carried out simultaneously, greatly improving production efficiency.

[0046] The injection mold 2 needs to realize the simultaneous execution of various processes and needs to work independently at the same time. Therefore, the mold opening and closing mechanisms are independently set up. The injection mold 2 of the present invention includes a lower mold group 21, an upper mold group 22 and a mold opening and closing mechanism 23. The lower mold group 21 is fixed on the work station of the turntable 1, and the upper mold group 22 is fixed above the lower mold group 21 through the mold opening and closing mechanism 23. The mold opening and closing mechanism 23 passes through the bottom of the turntable through the ejector rod and is connected to the mold opening and closing cylinder under the turntable. The action of the mold opening and closing cylinder drives the ejector rod to eject, thereby realizing the flipping of the mold opening and closing mechanism and thus realizing the opening and closing of the upper mold group 22.

[0047] like Figure 2 、 3 As shown in , 4 , the upper mold assembly 22 includes 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 .

[0048] like Figure 3 、 4As shown in Figures 5 and 6, the lower mold assembly 21 includes a lower mold frame 211, a lower mold cavity 212, a mold foot 213, a lower doubler plate 214, and a core assembly 215. The lower doubler plate 214 is fixedly mounted on the turntable 1, the mold foot 213 is fixedly mounted on the lower doubler plate 214, the lower mold frame 211 is fixedly mounted on the mold foot 213, the lower mold cavity 212 is fixedly mounted in 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. A product cavity and an injection flow channel are formed between the upper mold cavity 223, the lower mold cavity 212, and the core assembly 215. The product cavity forms two rows of multiple pipe products and is connected by the injection flow channel. An injection port 224 is provided on the top of the upper mold assembly 22, through which plasticized material is injected. An ejector mechanism is located between the lower doubler plate 214 and the lower mold frame 211. This mechanism is used to eject the product after it has cooled and set. The ejector mechanism's upper portion is connected to the injection molding runner via an ejector pin, and its lower portion is connected to the ejector plate on the upper surface of the lower doubler plate 214 via a spring return mechanism. The ejector cylinder below the turntable 1 pushes against the ejector plate through an ejection port 2141 in the center of the lower doubler plate 214, ejecting the pipe product. This ejector mechanism is a conventional structure and will not be described in detail here.

[0049] like Figure 2 As shown, the mold opening and closing mechanism 23 includes guide plates 231, a lifting seat 232, a hinged connecting rod 233, a stopper 234, a hinged base 235, and an ejector rod 236. The guide plates 231 are fixedly mounted on the left and right sides of the lower mold assembly 21. The lifting seat 232 is mounted around the upper surface of the lower composite plate 214 and the outer periphery of the lower mold frame 211. Four ejector rods 236 pass through holes in the turntable 1 and the lower composite 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 and ejection cylinder. The upper ends of the hinged connecting rods 233 are connected to the shafts on both sides of the upper mold assembly 22, and the lower ends are hingedly connected to the guide plates 231 and the lifting seat 232. When the mold is opened, the mold opening and ejection cylinder pushes the ejector rods 236 upward, driving the lifting seat 232 to rise, thereby rotating the hinged connecting rods 233 and causing the upper mold assembly 22 to flip.

[0050] Specifically, such as Figure 6As shown, the guide plate 231 has a guide groove 2311. The lower end of the guide groove 2311 is a vertical groove extending upward, and the upper end is an inclined groove. The lifting seat 232 includes left and right side panels 2321 on both sides and front and rear side panels 2322 on both sides. The left and right side panels 2321 and the front and rear side panels 2322 are fixedly connected and enclose the outer periphery of the lower mold frame 211. The left and right side panels 2321 have transverse guide grooves 23211. The upper end of the hinged connecting rod 233 is fixedly connected to the two sides of the upper mold frame 222 via a pin 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 panels 2321 via a pin 2332. In the mold closing state, the second pin 2332 is at the bottom of the guide groove 2311 and one end of the transverse guide groove 23211. When the mold is opened, as the lifting seat 232 rises, the second pin 2332 rises vertically from the bottom to the top along the guide groove 2311, and then enters the inclined groove of the guide groove 2311, causing the bottom of the hinged link 233 to tilt to one side, and the second pin 2332 slides to the other end of the transverse guide groove 23211. At this time, the tilt of the hinged link 233 causes the upper mold assembly 22 axially connected to it to flip to one side.

[0051] Guide plate 231 has slide slots at both ends. A hinged base 235 is fixed in the slide slot at the rear end of guide plate 231 and can slide up and down within the slot. A stopper 234 is fixed in the slide slot at the front end of guide plate 231 and can slide up and down within the slot. The upper end of hinged base 235 is connected to a connecting rod 2352 via a third pin 2351. The upper ends of connecting rod 2352 are fixedly connected to both sides of the rear end of upper mold frame 222. When the mold is opened, pin 2351 rotates, causing connecting rod 2352 to tilt.

[0052] like Figure 4 As shown, the upper end of the limiting member 234 has a notch slot 2341, and the front ends of the upper mold frame 222 of the upper mold assembly 22 have four pins 2221 on both sides. When the mold is closed, the four pins 2221 are snapped into the notch slot 2341 of the limiting member 234 to achieve precise alignment.

[0053] like Figure 6 、 7 As shown, there is a through hole between the hinged base 235 and the limiting member 234, and a clip 237 is arranged in the through hole. The clip 237 is an inverted trapezoid, and the clip 237 is at least partially exposed from the through hole. The exposed part of the clip 237 is a corner of the inverted trapezoid (the upper surface is a horizontal plane, and the lower surface is an inclined surface). The corresponding positions on the inner sides of the left and right side plates 2321 of the lifting seat 232 are provided with a clip groove 23212 that matches the inclined surface of the clip 237. During the rising stage of the lifting seat 232, the front end of the clip 237 is clipped in the clip groove 23212 of the left and right side plates 2321. The hinged base 235 and the limiting member 234 rise together with the left and right side plates 2321 along with the lifting seat 232 under the connection of the clip 237, thereby realizing the overall lifting of the upper module 22.

[0054] The guide plate 231 has a second clamping groove 2312 in the chute at both ends, which is the same as 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 (that is, when the second pin 2332 is at the highest point of the vertical groove), 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 left and right side plates Under the action of the inclined surface, the first clamping groove 23212 of 2321 and the clamping piece 237 push the clamping piece 237 into the second clamping groove 2312 of the guide plate 231, and the left and right side plates 2321 are disconnected from the hinge base 235 and the limit piece 234. The hinge base 235 and the limit piece 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 open.

[0055] like Figure 2 、 5 As shown, 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 is a vertical groove, and the lower end is an inclined groove. The end of the core assembly 215 is connected to the 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 mold assembly 22 is flipped, it just enters the inclined groove, thereby realizing the synchronous extraction of the core assembly 215.

[0056] After the mold is opened, the pipe ejection cylinder pushes against the ejector mechanism through the through hole between the turntable 1 and the lower plate 214 to eject the product and wait for the robot arm to grab it. After the robot arm grabs it, the pipe ejection cylinder retracts and the ejector mechanism is reset under the action of the spring reset mechanism. The mold opening ejection cylinder retracts, driving the ejector rod 236 to pull down and reset. The left and right side plates 2321 have a reset groove 23214 at the bottom, and the hinged base 235 and the limit member 234 have a reset pin 238 at the bottom. When resetting, the left and right side plates 2321 drop down until the reset groove 23214 is engaged with the reset pin 238, driving the hinged base 235 and the limit member 234 to drop down together. At this time, the clamping member 237 in the second clamping groove 2312 is separated from the guide plate 231 under the action of the inclined surface and is engaged with the first clamping groove 23212. The mold ejection cylinder continues to retract until the lifting seat 232, the hinged base 235 and the limit member 234 reach the bottom, the upper mold assembly 22 is molded, and the core assembly 215 is reset synchronously.

[0057] The three-station vertical pipe fitting injection molding mold circulation method of the present invention comprises the following steps:

[0058] Injection and pressure holding station 11: The empty injection mold 2 rotates 120° to the injection and pressure holding station 11 → clamp the upper mold assembly 22 → injection → pressure holding → the entire injection mold 2 rotates 120° to the cooling station 12;

[0059] 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;

[0060] Pick-up station 13: The entire injection mold 2 rotates 120° to the pick-up station 13 → injection mold 2 opens and cores are pulled → ejector mechanism ejects → pick-up → ejector mechanism resets → inserts are installed → injection mold 2 closes and cores are fed → injection mold 2 rotates 120° to the injection holding pressure station 11.

[0061] The three workstations work simultaneously to realize process flow, greatly improving the production efficiency of plastic pipe fittings containing inserts.

[0062] It will be understood that the present invention is described by way of some embodiments, and it will be appreciated by those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are intended to be 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 be rotated by a rotary motor of the vertical injection molding machine. The turntable (1) has three equally spaced workstations, namely an injection and pressure holding workstation (11), a cooling workstation (12) and a piece removal workstation (13); an injection mold (2) is fixedly mounted on each workstation, and a corresponding mold opening and ejection oil cylinder and a pipe ejection oil cylinder are provided below each workstation, which 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 (21), an upper mold assembly (22) and a mold opening and closing mechanism (23); the lower mold assembly (21) is fixed on the workstation of the turntable (1), and the upper mold assembly (22) is fixed on the workstation of the turntable (1). 2) The mold opening and closing mechanism (23) is fixed on the upper part of the lower mold assembly (21). The mold opening and closing mechanism (23) passes through the lower part of the turntable (1) through the ejector rod (236) and is connected to the mold opening and ejection oil cylinder below the turntable (1). The mold opening and ejection oil cylinder drives the ejector rod (236) to eject, thereby realizing the flipping of the mold opening and closing mechanism (23) and the opening and closing of the upper mold assembly (22). The three workstations work simultaneously to realize the process flow. The upper mold assembly (22) includes 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) The mold opening and closing mechanism (23) comprises a lower mold frame (211), a lower mold cavity (212), a mold foot (213), a lower double plate (214) and a core assembly (215), wherein the lower double plate (214) is fixedly mounted on the turntable (1), the mold foot (213) is fixedly mounted on the lower double plate (214), the lower mold frame (211) is fixedly mounted on the mold foot (213), the lower mold cavity (212) is fixedly mounted in 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); 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), wherein the guide plate (231) The lifting seat (232) is fixedly mounted on the left and right sides of the lower mold assembly (21), and is mounted around the upper portion 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 fixedly connected to the bottom of the lifting seat (232). The lower ends of the plurality of ejector rods (236) are fixedly connected to the mold opening ejection oil cylinder. 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 both sides of the lifting seat (232). When the mold is opened, the mold opening ejection oil cylinder pushes the ejector 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.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) on the front and rear 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) via a first pin (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) via a second pin (2332).

2. The three-station vertical pipe fitting injection molding mold structure according to claim 1 is characterized in that: The mold opening and closing mechanism (23) further includes a limiter (234) and an articulated base (235). Both ends of the guide plate (231) have a slide groove. 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), and 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), and 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.

3. The three-station vertical pipe fitting injection molding mold structure according to claim 2 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 the clamping member (237) is at least partially 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 (23212) that matches the inclined surface portion 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 clamping groove (23212) of the left and right side plates (2321). The hinged base (235) and the limiting member (234) rise together with the left and right side plates (2321) under the connection of the clamping member (237) along with the lifting seat (232), thereby achieving the overall lifting of the upper module (22).

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 second clamping groove (2312) in the chute 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 oil cylinder, the clamping grooves (23212) of the left and right side plates (2321) are aligned. ) and the clamping member (237) push the clamping member (237) into the clamping groove 2 (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 pin shaft 2 (2332) to slide along the inclined groove of the guide groove (2311), and the hinge connecting rod (233) rotates to flip and open the upper mold assembly (22).

5. The three-station vertical pipe fitting injection molding mold structure according to claim 1 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), wherein the upper end of the core-pulling guide grooves (23213) is a vertical groove and the lower end is an inclined groove. The end of the core assembly (215) is connected to 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), the core assembly (2151) enters the inclined grooves when the upper die set (22) is turned over, thereby realizing the synchronous withdrawal of the core assembly (215).

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

7. A circulation method for the three-station vertical pipe fitting injection molding mold structure according to any one of claims 1 to 6, characterized in that: The following steps are involved: Injection molding and pressure holding station (11): The empty injection mold (2) rotates 120° to the injection molding and pressure holding station (11) → the upper mold assembly (22) is clamped → injection → pressure holding → 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 removal station (13); Pick-up station (13): The entire injection mold (2) rotates 120° to the pick-up station (13) → the injection mold (2) opens and cores are pulled → the ejector mechanism ejects → the part is picked up → the ejector mechanism resets → the insert is installed → the injection mold (2) closes and cores are fed → the injection mold (2) rotates 120° to the injection holding pressure station (11).

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