Three-station vertical pipe fitting injection molding mold structure

Abstract

The utility model belongs to the technical field of injection molds, and discloses a three-station vertical pipe fitting injection molding mold structure, which comprises a turntable, the turntable is fixedly arranged on a vertical injection molding machine and can rotate under the driving of a rotating motor, and three stations, namely an injection molding pressure maintaining station, a cooling station and a piece taking station, are arranged on the turntable. 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 realized, 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] This utility model belongs to the field of injection mold technology, and in particular relates to a three-station vertical pipe injection molding mold structure. Background Technology

[0002] Plastic pipe fittings with inserts are a type of pipe connected using threaded inserts made of plastic and metal materials. They are system components that enable plastic pipes to change direction, flow, open and close, regulate, assemble, disassemble, and maintain. Plastic pipe fittings with inserts are produced using overmolding injection molding. 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 pulling, part removal, and resetting. This is a large category of products in the plastic pipe manufacturing industry characterized by complex processes, long processes, long cycles, and high costs. Currently, the production of plastic pipe fittings with inserts still primarily uses horizontal injection molding machines, supplemented by other equipment.

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

[0004] 1. Raw material heating and plasticizing: Driven by the transmission system, the screw of the injection molding machine conveys and compacts the plastic from the hopper. Under the shearing and friction of the external heater, screw, and barrel, the material gradually melts. When the predetermined injection volume is reached, the screw stops rotating and retracts.

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

[0006] 3. Injection unit forward movement: After the mold is closed, the injection unit moves forward so that the nozzle is completely in contact with the main sprue of the mold.

[0007] 4. Injection and Holding Pressure: The injection cylinder pushes the screw forward, injecting molten plastic into the mold cavity with sufficient pressure. After injection, the injection molding 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: After the plastic product has completely cooled and solidified, the mold-locking mechanism opens the mold and ejects the product from the mold.

[0010] The moving mold plate of a horizontal injection molding machine is fixed on the mold opening and closing mechanism of the injection molding machine. The injection molding machine can only complete one cycle of production each time it operates, and then resets and starts the next cycle of production. It cannot achieve simultaneous flow of multiple processes. Since the molded products containing inserts and pipe fittings are diverse in variety and specifications, and market demand is constantly changing, this production method is inefficient and cannot meet production needs. Utility Model Content

[0011] The purpose of this utility model is to provide a three-station vertical pipe injection molding die structure to solve the above-mentioned technical problems.

[0012] To solve the above-mentioned technical problems, the specific technical solution of the three-station vertical pipe fitting injection molding die structure of this utility model is as follows:

[0013] 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 under the drive of the machine's rotary motor. The turntable has three equally spaced stations: an injection and holding station, a cooling station, and a part removal station. Each station has an injection mold fixedly installed, and each station has a corresponding mold opening and ejection cylinder and a pipe fitting ejection cylinder below it, which rotate simultaneously with the turntable to realize the opening, ejection, and resetting of the three injection molds, respectively. The injection mold includes a lower mold assembly, an upper mold assembly, and an opening and closing mechanism. The lower mold assembly is fixed on a station on the turntable, and the upper mold assembly is fixed above the lower mold assembly through the opening and closing mechanism. The opening and closing mechanism is connected to the mold opening and ejection cylinder below the turntable via an ejection rod passing under the turntable. The action of the mold opening and ejection cylinder drives the ejection rod to eject, realizing the rotation of the opening and closing mechanism and thus opening and closing the upper mold assembly. The three stations work simultaneously to achieve process flow.

[0014] Furthermore, the upper module includes an upper cover plate, an upper mold frame, and an upper cavity. The upper mold frame is fixedly installed on the lower surface of the upper cover plate, and the upper cavity is fixedly installed inside the upper mold frame. The lower module includes a lower mold frame, a lower cavity, mold feet, a lower cover plate, and a core assembly. The lower cover plate is fixedly installed on a turntable, the mold feet are fixedly installed on the lower cover 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 assembly is installed on both sides of the lower cavity and 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 ejector rods. The guide plate is fixedly installed on the left and right sides of the lower mold assembly. The lifting seat is installed around the lower cover plate above and on the outer periphery of the lower mold frame. Multiple ejector rods pass through through holes in the turntable and the lower cover 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 ejector cylinder. The upper end of the hinged connecting rod is connected to the shafts on both sides of the upper mold assembly, and the lower end is hinged to the guide plate and both sides of the lifting seat. When the mold is opened, the mold opening ejector cylinder pushes the ejector rod upward, causing the lifting seat to rise, thereby causing the hinged connecting rod to rotate and causing the upper mold assembly to flip.

[0016] Furthermore, the guide plate has a guide groove, the lower end of which is a vertically upward groove 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. The left and right side plates and the front and rear side plates are fixedly connected and surround the outer periphery of the lower mold frame. The left and right side plates have transverse guide grooves. The upper end of the hinged connecting rod is fixedly connected to both sides of the upper mold frame by a first pin, and the lower end is movably connected to the guide groove of the guide plate and the transverse guide groove of the left and right side plates by a second pin.

[0017] Furthermore, the mold opening and closing mechanism also includes a limiting component and a hinge base. Both ends of the guide plate have sliding grooves. The hinge base is fixed in the sliding groove at the rear end of the guide plate and can slide up and down within the sliding groove. The limiting component is fixed in the sliding groove at the front end of the guide plate and can slide up and down within the sliding groove. The upper end of the hinge base is connected to a connecting rod via a pin three. 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 pin three rotates, and the connecting rod tilts. The upper end of the limiting component has a notch and slot. The front ends of the upper mold frame of the upper mold assembly have pin four. When the mold is closed, the pin four engages with the notch and slot of the limiting component to achieve precise alignment.

[0018] Furthermore, the hinge base and the limiting member have a through hole in the middle, and a snap-fit ​​member is provided in the through hole. The snap-fit ​​member is inverted trapezoidal, and at least part of the snap-fit ​​member is exposed in the through hole. The exposed part of the snap-fit ​​member is one corner of the inverted trapezoid. The inner sides of the left and right side plates of the lifting seat have snap-fit ​​grooves that match the inclined part of the snap-fit ​​member. During the lifting stage, the front end of the snap-fit ​​member snaps into the snap-fit ​​groove of the left and right side plates. The hinge base and the limiting member rise together with the left and right side plates under the connection of the snap-fit ​​member, realizing the overall lifting of the upper module.

[0019] Furthermore, the guide plate has the same snap-fit ​​grooves (II) as the left and right side plates in the sliding grooves at both ends. The position of the snap-fit ​​grooves (II) corresponds to the highest point of the vertical groove of the guide plate. When the upper module is raised to the highest position, the snap-fit ​​part is aligned with the snap-fit ​​groove (II). At this time, when the lifting seat continues to rise under the action of the mold opening and ejection cylinder, the snap-fit ​​grooves (I) of the left and right side plates and the snap-fit ​​part are pushed into the snap-fit ​​groove (II) of the guide plate by the action of the inclined surface. The left and right side plates are disengaged from the hinge base and the limiting part. The hinge base and the limiting part remain stationary. The lifting seat continues to rise, pushing the pin shaft (II) to slide along the inclined groove of the guide groove. The hinge connecting rod rotates, flipping and opening the upper module.

[0020] Furthermore, the inner sides of the front and rear ends of the left and right side plates have core-pulling guide grooves. The core-pulling guide grooves are vertical grooves at the top and inclined grooves at the bottom. The core assembly is connected to a core-pulling shaft at the end. During the lifting process, the two ends of the core-pulling shaft enter the core-pulling guide groove. Under the action of the core-pulling guide groove, the core assembly enters the inclined groove when the upper module flips, thus realizing the synchronous extraction of the core assembly.

[0021] Furthermore, an ejector mechanism is provided between the lower cladding plate and the lower mold frame. The ejector mechanism is used to eject the product after it has cooled and solidified. The upper part of the ejector mechanism is connected to the injection molding channel through ejector pins, and the lower part is connected to the ejector plate on the upper surface of the lower cladding plate through a spring reset mechanism. The ejector outlet in the middle of the lower cladding plate and the pipe ejection cylinder below the turntable eject the pipe product by pushing against the ejector plate through the ejector outlet.

[0022] The three-station vertical pipe fitting injection molding die structure of this utility model has the following advantages:

[0023] Improved production efficiency: By setting up three stations (injection and holding pressure station, cooling station, and part removal station), different processes can be performed simultaneously at the three stations, realizing the synchronous flow of injection molding, cooling, and part removal. This avoids 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.

[0024] Reduced equipment footprint: Due to the vertical structure, the layout of molds and equipment is more compact, reducing the equipment's floor space, making it particularly suitable for production environments with limited space.

[0025] High degree of automation: Through the rotation of the turntable and the automatic control of the hydraulic cylinder, the opening, closing, ejection and resetting of the mold are automated, reducing manual intervention, reducing the labor intensity of operators, and improving the stability and consistency of production.

[0026] Precise alignment and mold closing: The design of limiting components, hinged base and guide groove ensures precise alignment of the upper and lower mold groups during mold closing, avoiding mold misalignment or damage, improving product molding quality and mold life.

[0027] Synchronous core pulling and ejection: During the mold opening process, the core assembly is pulled out synchronously through the core pulling guide groove, avoiding the cumbersome steps of separate core pulling 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.

[0028] High adaptability: This mold structure is suitable for the production of various specifications of plastic tubing with inserts, which can meet the production needs of different products and has strong market adaptability.

[0029] Energy saving and environmental protection: Since the three workstations work simultaneously, the idle time of the equipment is reduced, energy consumption is lowered, and the requirements of green manufacturing and sustainable development are met.

[0030] Reduced production costs: By improving production efficiency, reducing manual intervention, and reducing equipment footprint, overall production costs have been effectively controlled, thereby improving the company's economic benefits.

[0031] In summary, the three-station vertical pipe fitting injection molding die structure of this utility model has significant advantages in improving production efficiency, reducing production costs, and improving product quality, and is suitable for large-scale, high-efficiency plastic pipe fitting production. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of the three-station vertical pipe fitting injection molding die of this utility model.

[0033] Figure 2 This is a schematic diagram of the side angle structure of the injection mold of this utility model;

[0034] Figure 3 This is a schematic diagram of the front angle structure of the injection mold of this utility model;

[0035] Figure 4 This is a schematic diagram of the angle structure of the back side of the injection mold of this utility model;

[0036] Figure 5 This is a schematic diagram of the injection mold in the mold opening state according to this utility model;

[0037] Figure 6 This is a schematic diagram of the guide plate, limiting component, and hinge base structure of the injection mold of this utility model;

[0038] Figure 7 This is a cross-sectional structural diagram of the guide plate groove of the injection mold of this utility model;

[0039] Explanation of markings in the diagram: 1. Turntable; 11. Injection and holding pressure station; 12. Cooling station; 13. Part removal station; 2. Injection mold; 21. Lower mold assembly; 211. Lower mold frame; 212. Lower cavity; 213. Mold foot; 214. Lower cover plate; 2141. Ejector outlet; 215. Core assembly; 2151. Core pulling shaft; 22. Upper mold assembly; 221. Upper cover plate; 222. Upper mold frame; 2221. Pin four; 223. Upper cavity; 224. Injection port; 23. Mold opening and closing mechanism; 231. Guide plate; 2311. Guide 2312, 23 ... Detailed Implementation

[0040] To better understand the purpose, structure, and function of this utility model, the following description, in conjunction with the accompanying drawings, provides a more detailed account of the structure of a three-station vertical pipe injection mold.

[0041] like Figure 1 As shown, this utility model discloses a three-station vertical pipe fitting injection molding die structure, including a turntable 1. The turntable 1 is fixedly installed on a vertical injection molding machine and can rotate under the drive of the vertical injection molding machine's rotary motor. The turntable 1 has three equally spaced stations, namely an injection and holding pressure station 11, a cooling station 12, and a part removal station 13. An injection mold 2 is fixedly installed on each station. A corresponding mold opening and ejection cylinder and a pipe fitting ejection cylinder are set below each station, which rotate simultaneously with the turntable 1 to realize the mold opening, ejection, and resetting of the three injection molds 2, respectively. The three stations can realize the simultaneous flow of different processes. The injection and holding pressure station realizes injection and holding pressure, the cooling station realizes cooling of the pipe fitting, and the part removal station realizes mold opening, part removal, and resetting. The three processes can be carried out simultaneously, which greatly improves production efficiency.

[0042] To enable simultaneous operation of each process, the injection mold 2 needs to work independently at the same time. Therefore, the mold opening and closing mechanisms are set up independently. The injection mold 2 of this utility model includes a lower mold assembly 21, an upper mold assembly 22, and an opening and closing mechanism 23. The lower mold assembly 21 is fixed on the work position of the turntable 1. The upper mold assembly 22 is fixed above the lower mold assembly 21 through the opening and closing mechanism 23. The opening and closing mechanism 23 is connected to the mold opening and ejection cylinder below the turntable by passing through the ejector rod. The action of the mold opening and ejection cylinder drives the ejector rod to eject, thereby realizing the rotation of the opening and closing mechanism and thus realizing the opening and closing of the upper mold assembly 22.

[0043] like Figure 2 , 3 As shown in Figure 4, the upper module 22 includes an upper cover 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 cover plate 221, and the upper cavity 223 is fixedly installed inside the upper mold frame 222.

[0044] like Figure 3 , 4 As shown in Figure 5, the lower mold assembly 21 includes a lower mold frame 211, a lower cavity 212, a mold foot 213, a lower cover plate 214, and a core assembly 215. The lower cover plate 214 is fixedly mounted on the turntable 1, the mold foot 213 is fixedly mounted on the lower cover plate 214, the lower mold frame 211 is fixedly mounted on the mold foot 213, the lower cavity 212 is fixedly mounted inside the lower mold frame 211, and the core assembly 215 is mounted on both sides of the lower cavity 212 and slidably connected to the lower mold frame 211. A product cavity and an injection flow channel are formed between the upper cavity 223, the lower cavity 212, and the core assembly 215. The product cavity forms two rows of multiple tubular products connected by the injection flow channel. The upper mold assembly 22 has an injection port 224 at its top, through which plasticized material is injected. An ejector mechanism is located between the lower cover plate 214 and the lower mold frame 211. This mechanism ejects the product after cooling and shaping. The upper part of the ejector mechanism connects to the injection molding channel via ejector pins, and the lower part connects to the ejector plate on the upper surface of the lower cover plate 214 via a spring return mechanism. The ejector outlet 2141 in the middle of the lower cover plate 214 allows the pipe ejection cylinder below the turntable 1 to push against the ejector plate through the ejector outlet 2141, thus ejecting the pipe product. The ejector mechanism is a conventional structure and will not be described in detail here.

[0045] like Figure 2As shown, the mold opening and closing mechanism 23 includes a guide plate 231, a lifting seat 232, a hinged connecting rod 233, a limiting member 234, a hinged base 235, and ejector rods 236. The guide plate 231 is fixedly installed on the left and right sides of the lower mold assembly 21. The lifting seat 232 is installed around the lower cover plate 214 above the lower mold frame 211. Four ejector rods 236 pass through the through holes on the turntable 1 and the lower cover 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 ejection 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 hinged to the guide plate 231 and the two sides of the lifting seat 232. When the mold is opened, the mold opening ejection cylinder pushes the ejector rods 236 upward, causing the lifting seat 232 to rise, thereby causing the hinged connecting rod 233 to rotate and causing the upper mold assembly 22 to flip.

[0046] Specifically, such as Figure 6 As shown, the guide plate 231 has a guide groove 2311, the lower end of which is a vertically upward groove, 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 at the front and rear. The left and right side plates 2321 and the front and rear side plates 2322 are fixedly connected and surround 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 by 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 by a second pin 2332. In the mold-closed state, pin 2332 is at the bottom of guide groove 2311 and one end of transverse guide groove 23211. When the mold opens, as the lifting seat 232 rises, pin 2332 rises vertically from the bottom along guide groove 2311 and then enters the inclined groove of guide groove 2311, causing the bottom of hinge link 233 to tilt to one side. Pin 2332 slides to the other end of transverse guide groove 23211. At this time, the tilt of hinge link 233 causes the upper mold assembly 22 connected to it to flip to one side.

[0047] Both ends of the guide plate 231 have grooves. The hinged base 235 is fixed in the groove at the rear end of the guide plate 231 and can slide up and down within the groove. The limiting member 234 is fixed in the groove at the front end of the guide plate 231 and can slide up and down within the groove. A connecting rod 2352 is connected to the upper end of the hinged base 235 via a pin 2351. 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 2351 rotates, and the connecting rod 2352 tilts.

[0048] like Figure 4As shown, the upper end of the limiting component 234 has a notch and slot 2341, and the front sides of the upper mold frame 222 of the upper module 22 have four pins 2221. When the mold is closed, the four pins 2221 are engaged with the notch and slot 2341 of the limiting component 234 to achieve precise alignment.

[0049] like Figure 6 , 7 As shown, the hinge base 235 and the limiting member 234 have a through hole, and a snap-fit ​​member 237 is provided in the through hole. The snap-fit ​​member 237 is an inverted trapezoid and at least part of the snap-fit ​​member 237 is exposed in the through hole. The exposed part of the snap-fit ​​member 237 is one corner of the inverted trapezoid (the upper surface is a horizontal plane and the lower surface is an inclined plane). The corresponding positions on the inner side of the left and right side plates 2321 of the lifting seat 232 have snap-fit ​​grooves 23212 that match the inclined part of the snap-fit ​​member 237. During the rising stage of the lifting seat 232, the front end of the snap-fit ​​member 237 snaps into the snap-fit ​​grooves 23212 of the left and right side plates 2321. The hinge base 235 and the limiting member 234 rise together with the left and right side plates 2321 under the connection of the snap-fit ​​member 237, realizing the overall lifting of the upper module 22.

[0050] The guide plate 231 has a second snap-fit ​​groove 2312 in the groove at both ends, which is the same as that in the left and right side plates 2321. The position of the second snap-fit ​​groove 2312 corresponds to the highest point of the vertical groove of the guide plate 231. When the upper module 22 is raised to the highest position (i.e., when the second pin 2332 is at the highest point of the vertical groove), the position of the snap-fit ​​part 237 is just aligned with the second snap-fit ​​groove 2312. At this time, when the lifting seat 232 continues to rise under the action of the mold opening and ejection cylinder, the left and right side plates The first snap-fit ​​groove 23212 of 2321 and the snap-fit ​​piece 237 are pushed into the second snap-fit ​​groove 2312 of the guide plate 231 by the inclined plane. The left and right side plates 2321 are disengaged from the hinge base 235 and the limiting piece 234. The hinge base 235 and the limiting piece 234 remain stationary. The lifting seat 232 continues to rise, pushing the second pin 2332 to slide along the inclined groove of the guide groove 2311. The hinge connecting rod 233 rotates, flipping and opening the upper module 22.

[0051] like Figure 2 , 5 As shown, the inner sides of the front and rear ends of the left and right side plates 2321 have core-pulling guide grooves 23213. The core-pulling guide grooves 23213 are vertical grooves at the top and inclined grooves at the bottom. The core assembly 215 is connected to a core-pulling shaft 2151 at the end. During the process of the lifting seat 232 rising, 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 215 enters the inclined grooves when the upper module 22 flips, realizing the synchronous extraction of the core assembly 215.

[0052] After the mold is opened, the pipe ejection cylinder pushes against the ejector pin mechanism through the through hole between the turntable 1 and the lower cover plate 214, ejecting the product and waiting for the robotic arm to grab it. After the robotic arm grabs it, the pipe ejection cylinder retracts, and the ejector pin mechanism is reset under the action of the spring reset mechanism. The mold opening ejection 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 limiting member 234 has a reset pin 238. When resetting, the left and right side plates 2321 descend until the reset groove 23214 is engaged with the reset pin 238, which drives the hinge base 235 and the limiting member 234 to descend together. At this time, the snap-fit ​​member 237 in the snap-fit ​​groove 2312 is disengaged from the guide plate 231 under the action of the inclined surface and snaps into the snap-fit ​​groove 23212. The mold opening and ejection cylinder continues to retract until the lifting seat 232, the hinge base 235 and the limiting member 234 reach the bottom. The upper module 22 achieves mold closing, and the core assembly 215 is reset synchronously.

[0053] The three-station vertical pipe fitting injection molding die transfer method of this utility model includes the following steps:

[0054] Injection and holding pressure station 11: The empty injection mold 2 rotates 120° to the injection and holding pressure station 11 → the upper mold assembly 22 locks the mold → injection → holding pressure → the entire injection mold 2 rotates 120° to the cooling station 12;

[0055] Cooling station 12: The entire injection mold 2 is rotated 120° to the cooling station 12 → cooling and waiting → the entire injection mold 2 is rotated 120° to the part removal station 13;

[0056] Part removal station 13: The entire injection mold 2 rotates 120° to the part removal station 13 → Injection mold 2 opens and pulls the core → Ejector mechanism ejects → Part removal → Ejector mechanism resets → Insertion → Injection mold 2 closes and inserts the core → Injection mold 2 rotates 120° to the injection pressure holding station 11.

[0057] With three workstations operating simultaneously, the process flow is realized, which greatly improves the production efficiency of plastic tubing containing inserts.

[0058] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.

Claims

1. A three-station vertical pipe fitting injection molding die structure, characterized in that, include: A turntable (1) is fixedly installed on a vertical injection molding machine and can rotate under the drive of the rotary motor of the vertical injection molding machine. The turntable (1) has three equally spaced stations, namely the injection and holding pressure station (11), the cooling station (12), and the part removal station (13). An injection mold (2) is fixedly installed on each station. A corresponding mold opening and ejection cylinder and a pipe ejection cylinder are set below each station. They rotate simultaneously with the turntable (1) to realize the mold opening, ejection, and resetting of the three injection molds (2). The injection mold (2) includes a lower mold assembly (2). 1) Upper module (22) and mold opening and closing mechanism (23). The lower module (21) is fixed on the station of the turntable (1). The upper module (22) is fixed above the lower module (21) through the mold opening and closing mechanism (23). The mold opening and closing mechanism (23) passes through the bottom of the turntable (1) through the ejector rod (236) and is connected to the mold opening ejector cylinder below the turntable (1). The action of the mold opening ejector cylinder drives the ejector rod (236) to eject, thereby realizing the opening and closing of the mold opening and closing mechanism (23) and thus realizing the opening and closing of the upper module (22). The three stations work at the same time to realize the process flow.

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

3. The three-station vertical pipe fitting injection molding die structure according to claim 2, characterized in that, The mold opening and closing mechanism (23) includes a guide plate (231), a lifting seat (232), a hinged connecting rod (233), and ejector rods (236). The guide plate (231) is fixedly installed on the left and right sides of the lower mold assembly (21). The lifting seat (232) is installed around the lower cover plate (214) above and around the outer periphery of the lower mold frame (211). Multiple ejector rods (236) pass through the through holes on the turntable (1) and the lower cover plate (214) and connect with the lifting seat (231). 32) The bottom is fixedly connected, and the lower ends of multiple ejector rods (236) are fixedly connected to the mold opening ejector cylinder; the upper end of the hinged connecting rod (233) is connected to the shafts on both sides of the upper mold (22), and the lower end is hinged to the guide plate (231) and the lifting seat (232). When the mold is opened, the mold opening ejector cylinder pushes the ejector rod (236) upward, which drives the lifting seat (232) to rise, thereby driving the hinged connecting rod (233) to rotate and driving the upper mold (22) to flip.

4. The three-station vertical pipe fitting injection molding die structure according to claim 3, characterized in that, The guide plate (231) has a guide groove (2311). The lower end of the guide groove (2311) is a vertical groove that extends vertically upwards, 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) at the front and back. The left and right side plates (2321) and the front and rear side plates (2322) are fixedly connected and surround the outer periphery of the lower mold frame (211). The left and right side plates (2321) have a transverse guide groove (23211). The upper end of the hinged connecting rod (233) is fixedly connected to both sides of the upper mold frame (222) by 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 groove (23211) of the left and right side plates (2321) by a second pin (2332).

5. The three-station vertical pipe fitting injection molding die structure according to claim 4, characterized in that, The mold opening and closing mechanism (23) also includes a limiting member (234) and a hinge base (235). Both ends of the guide plate (231) have sliding grooves. The hinge 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 hinge base (235) is connected to a connecting rod (2351) through a pin (2351). 52), the upper end of the connecting rod (2352) is fixedly connected to the two rear sides of the upper mold frame (222). When the mold is opened, the pin three (2351) rotates and the connecting rod (2352) tilts. The upper end of the limiting member (234) has a notch slot (2341). The upper mold frame (222) of the upper mold group (22) has pin four (2221) on both sides of the front end. When the mold is closed, the pin four (2221) is inserted into the notch slot (2341) of the limiting member (234) to achieve precise alignment.

6. The three-station vertical pipe fitting injection molding die structure according to claim 5, characterized in that, The hinge base (235) and the limiting member (234) have a through hole, and a snap-fit ​​member (237) is provided in the through hole. The snap-fit ​​member (237) is an inverted trapezoid and at least part of the snap-fit ​​member (237) is exposed in the through hole. The exposed part of the snap-fit ​​member (237) is one corner of the inverted trapezoid. The corresponding positions on the inner side of the left and right side plates (2321) of the lifting seat (232) have snap-fit ​​grooves (23212) that match the inclined part of the snap-fit ​​member (237). During the rising stage of the lifting seat (232), the front end of the snap-fit ​​member (237) is snapped into the snap-fit ​​grooves (23212) of the left and right side plates (2321). The hinge base (235) and the limiting member (234) and the left and right side plates (2321) rise together with the lifting seat (232) under the connection of the snap-fit ​​member (237), realizing the overall lifting of the upper module (22).

7. The three-station vertical pipe fitting injection molding die structure according to claim 6, characterized in that, The guide plate (231) has a second snap-fit ​​groove (2312) in the sliding groove at both ends, which is the same as the one in the left and right side plates (2321). The position of the second snap-fit ​​groove (2312) corresponds to the highest point of the vertical groove of the guide plate (231). When the upper module (22) is raised to the highest position, the position of the snap-fit ​​piece (237) is just aligned with the second snap-fit ​​groove (2312). At this time, when the lifting seat (232) continues to rise under the action of the mold opening and ejection cylinder, the first snap-fit ​​groove (23212) of the left and right side plates (2321) is aligned with the second snap-fit ​​groove (2312). The snap-fit ​​component (237) is pushed into the snap-fit ​​groove (2312) of the guide plate (231) by the inclined plane. The left and right side plates (2321) are disengaged from the hinge base (235) and the limiting component (234). The hinge base (235) and the limiting component (234) remain stationary. The lifting seat (232) continues to rise, pushing the pin shaft (2332) to slide along the inclined groove of the guide groove (2311). The hinge connecting rod (233) rotates, flipping and opening the upper module (22).

8. The three-station vertical pipe fitting injection molding die structure according to claim 7, characterized in that, The left and right side plates (2321) have core-pulling guide grooves (23213) on the inner sides of the front and rear ends. The core-pulling guide grooves (23213) are vertical grooves at the top and inclined grooves at the bottom. The core assembly (215) is connected to a core-pulling shaft (2151) at the end. During the process of the lifting seat (232) rising, the two ends of the core-pulling shaft (2151) enter the core-pulling guide groove (23213). Under the action of the core-pulling guide groove (23213), the core assembly (215) enters the inclined groove when the upper module (22) flips, so as to realize the synchronous extraction of the core assembly (215).

9. The three-station vertical pipe fitting injection molding die structure according to claim 3, characterized in that, There is an ejector mechanism between the lower cover plate (214) and the lower mold frame (211). 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 flow channel through the ejector pin, and the lower part is connected to the ejector plate on the upper surface of the lower cover plate (214) through the spring reset mechanism. The ejector outlet (2141) in the middle of the lower cover plate (214) and the pipe ejection cylinder below the turntable (1) push against the ejector plate through the ejector outlet (2141) to realize the ejection of the pipe product.

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