Vertical thermoplastic material injection molding machine and operation method thereof

Abstract

The invention relates to the technical field of injection molding machines, and discloses a vertical thermoplastic material injection molding machine and an operation method thereof.The injection molding machine comprises a rack and an operation table, the operation table is installed at the upper end of the rack, and an injection molding mechanism used for processing plastic particle raw materials is installed at the upper end of the rack; a mold mechanism is installed on the operation table and located at the lower end of the injection molding mechanism, a power mechanism is installed at the lower end of the mold mechanism, the mold mechanism comprises an upper mold base and a lower mold base which correspond to each other, the lower mold base is located at the upper end of the rack, and the power mechanism drives the mold mechanism to replace the position and is matched with the injection molding mechanism to complete injection molding operation. According to the injection molding machine, the ejection linkage assembly and the power mechanism are in transmission logic combination, the transmission block is used for pushing the push-out sliding plate to drive the telescopic hinge rod to act, synchronous ejection of the multiple ejection rods is achieved in cooperation with the traction rope and the reset spring, and an independent driving unit does not need to be additionally arranged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of injection molding machines, in particular to a vertical thermoplastic material injection molding machine and an operating method thereof. BACKGROUND

[0002] Thermoplastic materials have the characteristics of heating melting and cooling setting, and are widely used in injection molding. Vertical thermoplastic material injection molding machines are often used for small and medium-sized plastic part production due to their small footprint and convenient operation. When such equipment is running, the molded plastic parts need to be ejected from the mold cavity through an ejection structure.

[0003] The ejection structure of the traditional device needs to be additionally configured with a separate driving unit (such as a motor or a pneumatic cylinder) to complete the demolding through "single push rod - multiple ejector rods" rigid connection or "cam - connecting rod" indirect transmission. There is a gap between the transmission components and the mold groove body, and the surface is not specially treated for wear resistance. The ejection action needs to rely on the control system to coordinate and switch the rhythm of the mold. Although some structures are equipped with springs, they can only realize single-direction buffering, and the adaptability of synchronous adjustment of multiple ejector rods is limited. The overall structure contains many independent components, and the assembly process and manufacturing cost are relatively high. SUMMARY

[0004] The purpose of the present application is to solve the problems of the prior art, such as the need for additional driving of the ejection structure of the existing injection molding machine, the transmission gap, the lack of wear resistance, the reliance on control coordination, the single spring buffering, the many components, and the high cost. A vertical thermoplastic material injection molding machine and an operating method thereof are proposed.

[0005] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme: a vertical thermoplastic material injection molding machine, comprising a rack and an operating table, the operating table is installed on the upper end of the rack, the rack upper end is installed with an injection mechanism for processing plastic particle raw materials, the operating table lower end is installed with a mold mechanism, and the mold mechanism lower end is installed with a power mechanism. The mold mechanism comprises four corresponding upper and lower mold bases, the lower mold base is located on the upper end of the rack, the lower mold base lower end is connected with the power mechanism, the upper mold base is detachably connected with the lower mold base and can realize mold closing, the upper mold base upper end is fixedly connected with a sprue bushing, the sprue bushing is connected with the injection mechanism, and the power mechanism drives the mold mechanism to replace the position and complete the injection molding operation in cooperation with the injection mechanism.

[0006] Preferably, the power mechanism comprises a power motor installed on the operating table, the power motor output end is fixedly connected with a power rotating wheel, the power rotating wheel is rotatably connected with four power rods arranged in a ring shape, each power rod is rotatably connected with an arc-shaped plate, and the arc-shaped plate is installed with a transmission member for transmission.

[0007] Preferably, the transmission member comprises a transmission rod rotatably mounted at one end of the arc-shaped plate, the operating table is provided with a first groove body adapted to the transmission rod, the first groove body is in sliding connection with the transmission rod, one end of the transmission rod is rotatably connected with a transmission block, the lower die seat is provided with a second groove body at the lower end, the transmission block is in sliding connection with the second groove body, the operating table is provided with a third groove body, the groove wall of the third groove body is in close contact with the end of the transmission rod away from the arc-shaped plate, and the third groove body and the first groove body are in communication on the surface of the operating table to jointly define the movement track of the transmission rod.

[0008] Preferably, the lower die seat of the mold mechanism is provided with a self-adaptive positioning assembly, the self-adaptive positioning assembly comprises guide sleeve blocks welded at four corners of the bottom of the lower die seat and pre-guide pins fixed at corresponding mold positions of the operating table, a compression spring is sleeved at the lower end of the pre-guide pin, and the inner diameter of the guide sleeve block is steppedly contracted from top to bottom.

[0009] Preferably, the self-adaptive positioning assembly further comprises an auxiliary member and a time-delay member. The auxiliary member comprises an auxiliary turntable rotatably mounted in the operating table, the auxiliary turntable is fixedly mounted on the output end of the power motor, four auxiliary push rods are fixedly mounted on the auxiliary turntable, an auxiliary rotating ring is fixedly connected in the operating table, and the end portions of the four auxiliary push rods are uniformly sleeved on the auxiliary rotating ring and in sliding connection with the auxiliary rotating ring.

[0010] Preferably, the time-delay member comprises four time-delay push blocks sleeved on the auxiliary rotating ring, the time-delay push blocks are in sliding connection with the auxiliary rotating ring, the time-delay push blocks and the end portions of the auxiliary push rods are connected through time-delay springs, and the time-delay springs are fixedly connected with the auxiliary push rods and the time-delay push blocks at both ends.

[0011] Preferably, the operating table is provided with an ejection linkage assembly at the position corresponding to the lower die seat. The ejection linkage assembly comprises a push-out sliding plate arranged in the lower die seat, a first push rod arranged in the lower die seat, two telescopic hinge rods connected between the first push rod and the push-out sliding plate, and an ejection member arranged on the telescopic hinge rod. The push-out sliding plate is located in the second groove body and in sliding connection with the second groove body, the push-out sliding plate is fixedly provided with a second push rod corresponding to the first push rod, the first push rod is arranged in parallel in the lower die seat, the first push rod is located in the lower die seat, the two telescopic hinge rods are arranged in symmetry, are in the initial state in the shape of "<", the sharp ends are movably connected, torsional springs are arranged at the sharp end connection positions, the two ends of the telescopic hinge rod are rotatably connected with the second push rod and the first push rod respectively, and the telescopic hinge rod is rotatably connected with the second push rod and the first push rod.

[0012] Preferably, the ejection member comprises four first ejecting rods fixedly installed on the lower die seat, a second ejecting rod is slidably connected to the first ejecting rod, a reset spring is installed inside the first ejecting rod, and a traction piston is also slidably connected inside the first ejecting rod, the upper end of the traction piston is fixedly connected with the lower end of the reset spring, and the upper end of the reset spring is fixedly connected with the bottom of the second ejecting rod; The first push rod and the second push rod are respectively connected with traction ropes, the traction ropes pass through the traction piston and are fixedly connected with the traction piston, and the two traction ropes are always in a taut state, wherein the two ends of the traction rope on the first push rod are respectively inserted into two first ejecting rods close to the second push rod and are in transmission connection with the bottom of the corresponding second ejecting rod through the traction piston, and the two ends of the traction rope on the second push rod are respectively inserted into two first ejecting rods close to the first push rod and are in transmission connection with the bottom of the corresponding second ejecting rod through the traction piston. The upper end of the second ejecting rod movably installs a top plate, the top plate is designed to be wide at the upper end and narrow at the lower end, and the second ejecting rod and the top plate are both provided with through holes and the through holes are in communication.

[0013] The application further provides an operation method of the vertical thermoplastic material injection molding machine, which comprises the following steps: S1, raw material preparation: thermoplastic plastic particles are added into a hopper, fall into a heating cylinder through a flange, the heating cylinder is heated by ceramic heating sheets in multiple temperature control zones, and a servo motor drives a gradually changing pitch screw rod to rotate, so that the particles are gradually pushed to the end of the heating cylinder to melt and stir and homogenize, forming an injection melt; S2, mold alignment: a power motor drives a power rotating wheel to rotate, an arc-shaped plate is driven to move through a power rod, a transmission rod slides along an L-shaped composite groove, and a transmission block is pushed along a second groove body (moving to realize mold group station switching), when switching, a guide sleeve block is first coarsely positioned with an upper segment of a pre-guide pin, then is finely positioned with a lower segment after being buffered by a compression spring, an auxiliary push rod extrudes a delay spring to push a delay block to abut against the transmission rod, and the transmission rod is stably positioned after being delayed; S3, injection operation: a mold locking mechanism drives an upper die seat and a lower die seat to be combined, a lifting frame drives an injection mechanism to descend, a laser sensor and a fine adjustment oil cylinder are precisely positioned with an injection nozzle and a gate sleeve, the injection mechanism injects the melt into a cavity, a mold locking oil cylinder adjusts mold locking force according to injection pressure, and pressure maintaining and cooling are completed; S4, plastic part ejection: after the mold is opened, the transmission block pushes the ejection slide plate, the second push rod extrudes the telescopic hinge rod to reduce the included angle, the first push rod and the second push rod are driven to move towards each other, the push rod pulls the traction rope to drive the traction piston to move upwards, the second ejecting rod is pushed to move upwards by the extruded reset spring, the top plate ejects the plastic part, and the compressed air in the first ejecting rod is discharged through the through hole to assist demolding; S5, cycle reset: after the plastic part is taken out, the torsional spring drives the telescopic hinge rod to expand, the push rod returns to the original position and pulls back the traction rope, the reset spring pushes the second ejector rod and the traction piston to reset, the power mechanism drives the module to switch to the next station, and S2-S4 is repeated to realize continuous production.

[0014] The present application has the following beneficial effects: 1、The vertical thermoplastic material injection molding machine provided by the present application combines the ejection linkage assembly with the transmission logic of the power mechanism, uses the transmission block to push the ejection slide plate to drive the telescopic hinge rod to act, and cooperates with the traction rope and the reset spring to realize synchronous ejection of multiple ejector rods, without the need for additional independent drive units.

[0015] 2、The vertical thermoplastic material injection molding machine provided by the present application precisely matches the transmission rod with the composite groove body, positions the assembly stepwise, and buffers with the delay spring, realizes the cooperation of mold switching and ejection action, reduces the number of independent components, simplifies the assembly process, improves the synchronization of multiple ejector rods and the wear resistance of transmission, reduces the manufacturing cost and maintenance demand. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a three-dimensional structure schematic diagram of the vertical thermoplastic material injection molding machine provided by the present application; Figure 2 It is a plane structure schematic diagram of the vertical thermoplastic material injection molding machine provided by the present application; Figure 3 It is a partial schematic diagram of the operation table provided by the present application; Figure 4 It is Figure 3 It is an enlarged view of part A; Figure 5 It is a bottom view structure schematic diagram of the lower mold base provided by the present application; Figure 6 It is a plane view of the operation table provided by the present application; Figure 7 It is a three-dimensional structure schematic diagram of the power mechanism provided by the present application; Figure 8 It is a three-dimensional structure schematic diagram of the lower mold base provided by the present application; Figure 9 It is an internal structure schematic diagram of the lower mold base provided by the present application; Figure 10 It is an internal structure schematic diagram of the ejector provided by the present application.

[0017] Figure 11 It is a sectional view of the second ejector rod provided by the present application.

[0018] Figure 12 It is a gas flow path diagram of the second ejector rod provided by the present application.

[0019] In the figure: 1, frame; 2, operation table; 3, injection mechanism; 31, hopper; 32, heating cylinder; 33, screw; 34, injection nozzle; 4, mold mechanism; 5, power mechanism; 41, upper mold base; 42, lower mold base; 411, sprue bushing; 51, power motor; 52, power rotating wheel; 53, power rod; 54, arc plate; 55, transmission part; 551, transmission rod; 552, first groove body; 553, transmission block; 554, second groove body; 555, third groove body; 61, guide sleeve block; 62, pre-guide pin; 63, auxiliary part; 631, auxiliary rotating disc; 632, auxiliary push rod; 633, auxiliary rotating ring; 64, time-delay part; 641, time-delay push block; 642, time-delay spring; 65, push-out sliding plate; 66, first push rod; 67, telescopic hinge rod; 68, ejection part; 651, second push rod; 681, first ejection rod; 682, second ejection rod; 683, reset spring; 684, traction rope; 685, traction piston; 686, through hole; 687, top plate; 7, mold locking mechanism; 71, lifting frame; 72, hydraulic plate; 711, guide column; 712, guide sleeve ring. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments of the present application.

[0021] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0022] REFERENCE Figures 1-12The utility model relates to a vertical thermoplastic material injection molding machine, including frame 1 and operating platform 2, in this embodiment, frame 1 is in the frame structure as a whole, for realizing the accurate fixing of operating platform 2 and injection molding mechanism 3, operating platform 2 is installed on the upper end of frame 1, in this embodiment, operating platform 2 is reserved with the mounting cavity inside, the mounting cavity inner wall is equipped with the reinforcing rib for accommodating part transmission parts of power mechanism 5, improve the structural strength of operating platform 2 itself simultaneously, the injection molding mechanism 3 for processing plastic particle raw materials is installed on the upper end of frame 1, in this embodiment, injection molding mechanism 3 is fixedly installed on the side of frame 1 mounting platform, including hopper 31, heating cylinder 32, screw 33 and injection nozzle 34, hopper 31 adopts transparent material, and the lower end is connected with the feeding port of heating cylinder 32 through flange, for storing plastic particle raw materials, the outer surface of heating cylinder 32 is wound with ceramic heating sheet, and the heating sheet is divided into a plurality of temperature control zones along the axial direction of heating cylinder 32, and each temperature control zone is equipped with independent thermocouple, can realize the accurate temperature control of different temperature ranges, meet the melting demand of a variety of thermoplastic materials, screw 33 is driven through servo motor, and the rotating speed can be adjusted as required, and the surface of screw 33 is equipped with gradually changing pitch thread, can gradually push the plastic particles falling from hopper 31 to the end of heating cylinder 32 and melt sufficiently, and injection nozzle 34 is located at the lower end of heating cylinder 32, and is coaxially corresponding with the sprue bush 411 of mold mechanism 4, and one-way valve is arranged at the outlet, prevents the backflow of molten plastic, and the mold mechanism 4 is installed on the lower end of injection molding mechanism 3 on operating platform 2, and the power mechanism 5 is installed at the lower end of mold mechanism 4.

[0023] The locking mechanism 7 that slides along the rectangular guide rail is arranged on the upper end of the frame 1, and includes a lifting frame 71 and a hydraulic plate 72.

[0024] When the mold base 42 is sent to the position by the power mechanism 5, the injection molding mechanism 3 is first roughly positioned, and then the injection nozzle 34 and the sprue bush 411 are precisely positioned by the laser sensor and the fine adjustment oil cylinder.

[0025] Reference Figure 3As shown, the mold mechanism 4 includes four corresponding upper die seats 41 and lower die seats 42, in this embodiment, a set of upper die seats 41 and lower die seats 42 are paired to form a complete mold module, through multi-module cycle operation to improve injection efficiency, the lower die seat 42 is located at the upper end of the rack 1, the lower end of the lower die seat 42 is connected with the power mechanism 5, the upper die seat 41 is detachably connected with the lower die seat 42 and can realize mold closing, the upper end of the upper die seat 41 is fixedly connected with a sprue bushing 411, the sprue bushing 411 is connected with the injection mechanism 3, the power mechanism 5 drives the mold mechanism 4 to change position, and the injection mechanism 3 is matched to complete the injection operation.

[0026] It should be noted that, as Figure 3 As shown, the four modules are evenly distributed along the annular guide rail of the operation table 2, and correspond to the injection station ①, the cooling station ②, the part taking station ③ and the standby station ④ respectively. In the initial state, the injection station ① is located directly below the injection mechanism 3. When the injection mechanism 3 completes the injection of molten plastic, the power mechanism 5 drives the lower die seat 42 to change position along the annular guide rail in the direction indicated by the arrow, thereby realizing the position switching of the mold module and completing the injection. The mold module that has completed injection is moved to the cooling station ② for plastic part shaping. The cooled mold module is moved to the part taking station ③ to wait for demolding. At the same time, the empty mold module in the standby station is moved to the injection station ① to cooperate with the injection mechanism 3 to start the next round of injection operation, forming a cycle process of "injection, cooling, part taking and standby", which greatly improves the overall production efficiency of the equipment.

[0027] Referring to Figures 3-7 As shown, the power mechanism 5 includes a power motor 51 mounted on the operation table 2. In this embodiment, the core of the power mechanism 5 is a power motor 51 mounted inside the operation table 2. The output end of the power motor 51 is fixedly connected with a power rotating wheel 52. In this embodiment, the power rotating wheel 52 is a circular metal rotating disc. Four power rods 53 are arranged in a ring array and are rotatably connected to the power rotating wheel 52. In this embodiment, each power rod 53 is rotatably connected with an arc plate 54. In this embodiment, the two ends of the power rod 53 are provided with circular holes, which are rotatably connected with the ear seat of the power rotating wheel 52 and the arc plate 54 respectively, to ensure smooth power transmission. The arc plate 54 is provided with a transmission member 55 for transmission. In this embodiment, the four arc plates 54 correspond to the four power rods 53 respectively, and move in an arc line synchronously with the rotation of the power rotating wheel 52, thereby driving the transmission member 55 to drive the displacement of the mold mechanism 4.

[0028] When the power mechanism 5 works, the power motor 51 mounted inside the operation table 2 outputs power to drive the power rotating wheel 52 to rotate. The power rotating wheel 52 drives one end of the power rod 53 to rotate, and the other end of the power rod 53 is rotatably connected with the arc plate 54, so that the four power rods 53 drive the corresponding arc plates 54 to move in an arc line synchronously. The arc plate 54 drives the transmission member 55 mounted thereon to act.

[0029] In summary, the power mechanism 5 drives the die holder 42 to switch the workstations through the linkage of the power runner 52, the arc plate 54 and the channel, and directly pushes the push-out slide 65 through the transmission block 553 to trigger the ejection linkage assembly to move, realizing the mechanical linkage of the die indexing and the plastic part ejection. No additional driving unit or complex control logic is needed, and the power mechanism 5 naturally has the function integration attribute, which can reduce the assembly and coordination of independent parts. The transmission rod 551 and the third groove 555 adopt surface contact matching, and the contact area is larger, which can uniformly disperse the radial load in the injection molding process, reduce the local pressure, and maintain stable transmission precision during long-term use. The power mechanism 5 synchronously integrates the self-adaptive positioning assembly and the delay piece 64, and can realize smooth transition of coarse positioning and fine positioning through the stepped guide sleeve block 61 during die switching, and buffer the transmission steering impact with the delay spring 642. No additional independent positioning and buffering components are needed, the overall structure is more compact, and the assembly error between multiple components can be reduced.

[0030] Reference Figure 6 and Figure 7 As shown in the figure, the transmission member 55 includes a transmission rod 551 rotatably installed at one end of the arc plate 54, and a first groove 552 is formed on the operation table 2 to match the transmission rod 551. The first groove 552 is in sliding connection with the transmission rod 551. In this embodiment, the first groove 552 has an l-shaped cross section, and the inner wall is polished smooth. The end of the transmission rod 551 away from the arc plate 54 is embedded in the first groove 552, and the transmission rod 551 and the first groove 552 form a sliding connection. When the arc plate 54 drives the transmission rod 551 to move, the transmission rod 551 can smoothly slide along the track of the first groove 552. The transmission rod 551 is rotatably connected to a transmission block 553 at one end. The lower end of the lower die holder 42 is provided with a second groove 554, and the transmission block 553 is in sliding connection with the second groove 554. In this embodiment, the second groove 554 is l-shaped, and the transmission block 553 is embedded in the second groove 554 to form a sliding fit. When the transmission rod 551 drives the transmission block 553 to move, the transmission block 553 can slide in the second groove 554, thereby pushing the lower die holder 42 to move along the annular guide rail of the operation table 2.

[0031] To further limit the movement trajectory of the transmission rod 551 and ensure transmission accuracy, a third groove 555 is also provided on the surface of the operation table 2, which is in communication with the first groove 552 on the surface of the operation table 2 to form an L-shaped composite groove. The groove wall of the third groove 555 closely fits the end of the transmission rod 551 away from the arc-shaped plate 54, which can limit the radial deviation of the transmission rod 551 during sliding to avoid displacement deviation of the lower mold base 42 due to shaking of the transmission rod 551. Through the cooperative constraint of the first groove 552 and the third groove 555, the transmission rod 551 always moves along a fixed trajectory, ensuring the accuracy of power transmission and realizing the precise switching of the mold mechanism 4 between different stations in cooperation with the injection mechanism 3 and the ejection assembly.

[0032] It should be noted that the surfaces of the first groove 552, the second groove 554, and the third groove 555 are treated by carburizing, nitriding, and DLC surface treatment processes, with a surface hardness of HRC 58 or above and a friction coefficient as low as ≤0.15, effectively improving the wear resistance and service life of the components.

[0033] When the transmission member 55 is working, in the process of sliding the transmission rod 551 along the first groove 552 driven by the arc-shaped plate 54, the transmission rod 551 preferentially drives the transmission block 553 to slide in the second groove 554. Until the transmission block 553 slides to the groove bottom of the second groove 554, the transmission rod 551 can continue to move along the first groove 552, thereby pushing the lower mold base 42 to move along the annular guide rail of the operation table 2. The surface of the operation table 2 is in communication with the first groove 552 to form an L-shaped composite groove, and the third groove 555 closely fits the transmission rod 551 to limit its radial deviation, and cooperatively constrain the movement trajectory of the transmission rod 551.

[0034] In summary, the power mechanism 5 and the transmission member 55 transmit power to accurately convert the rotation of the power motor 51 into displacement of the lower mold base 42, ensuring precise switching of the mold mechanism 4 station, cooperating with the injection mechanism 3 and the ejection assembly to reduce friction, prevent shaking, maintain the accuracy of plastic parts, realize multi-station circulation, and improve production efficiency.

[0035] Reference Figure 5 , Figure 6 and Figure 7The bottom of the lower die seat 42 of the mold mechanism 4 is provided with a self-adaptive positioning assembly, which comprises guide sleeve blocks 61 welded at the four corners of the bottom of the lower die seat 42 and pre-guide pins 62 fixed at the corresponding mold positions of the operation table 2. In this embodiment, the inner diameter of the guide sleeve blocks 61 is stepped from top to bottom, and the upper segment inner diameter is slightly larger than the diameter of the pre-guide pins 62, facilitating the initial insertion of the pins, and the lower segment inner diameter is accurately matched with the diameter of the pre-guide pins 62, achieving final positioning. The pre-guide pins 62 are correspondingly installed at the four corner positions of each mold position of the operation table 2, and a compression spring is sleeved at the lower end of the pre-guide pin 62. The inner diameter of the guide sleeve blocks 61 is stepped from top to bottom, and in this embodiment, the compression spring is initially in a slightly compressed state. When the guide sleeve blocks 61 move downward with the lower die seat 42, the pre-guide pins 62 are first inserted into the upper segment of the guide sleeve blocks 61 for rough positioning. As the lower die seat 42 continues to move, the spring is further compressed and generates an upward elastic force, which offsets the impact force of the downward movement of the lower die seat 42, and at the same time guides the accurate docking of the guide sleeve blocks 61 and the pre-guide pins 62, avoiding damage to the components caused by hard contact.

[0036] Referring to Figure 7 As shown, the self-adaptive positioning assembly further comprises an auxiliary part 63 and a time delay part 64. The auxiliary part 63 comprises an auxiliary turntable 631 rotatably installed inside the operation table 2, and the auxiliary turntable 631 is fixedly installed on the output end of the power motor 51. In this embodiment, the auxiliary turntable 631 is fixedly connected with the output end of the power motor 51 and rotates synchronously with the motor. Four auxiliary push rods 632 are fixedly installed on the auxiliary turntable 631, and an auxiliary rotating ring 633 is fixedly connected inside the operation table 2. The end portions of the four auxiliary push rods 632 are uniformly sleeved on the auxiliary rotating ring 633 and are in sliding connection with the auxiliary rotating ring 633. In this embodiment, when the auxiliary turntable 631 rotates, the auxiliary push rods 632 slide along the rotating ring synchronously, providing auxiliary guidance for the movement of the lower die seat 42 and avoiding radial deviation of the lower die seat 42 during switching.

[0037] Referring to Figure 7 As shown, the time delay part 64 comprises four time delay push blocks 641 sleeved on the auxiliary rotating ring 633, and the time delay push blocks 641 are in sliding connection with the auxiliary rotating ring 633. The time delay push blocks 641 and the end portions of the auxiliary push rods 632 are connected through time delay springs 642, and the two ends of the time delay springs 642 are fixedly connected with the auxiliary push rods 632 and the time delay push blocks 641. In this embodiment, the time delay springs 642 are in a natural elongation state in the initial state, and the length is slightly shorter than the initial distance between the auxiliary push rods 632 and the time delay push blocks 641, so that the time delay springs 642 maintain a slight pre-tightening force after assembly. This pre-tightening force allows the time delay push blocks 641 to lightly adhere to the auxiliary rotating ring 633 in the non-working state, avoiding shaking when idle.

[0038] When the power motor 51 is started, the power motor 51 drives the power rotating wheel 52 and the auxiliary rotating disc 631 to rotate synchronously: the power rotating wheel 52 drives the transmission rod 551 to move along the first groove body 552 through the power rod 53 and the arc-shaped plate 54, in this stage, the auxiliary push rod 632 is pre-moved with the auxiliary rotating disc 631, the elastic tension of the delay spring 642 is generated by extrusion, the delay push block 641 is pushed to face contact and fit the transmission rod 551, and the radial resistance force of the delay push block 641 disappears when the transmission rod 551 moves to the through part of the first groove body 552 and the third groove body 555 and turns into circular movement, the auxiliary push rod 632 stops extruding the delay spring 642, the delay spring 642 releases the elastic force, the delay push block 641 moves along the auxiliary rotating ring 633 synchronously with the transmission rod 551, the transmission rod 551 is smoothly turned, and the precision and stability of the position switching of the lower mold seat 42 are ensured.

[0039] Referring to Figures 8-12 As shown, the operation table 2 is provided with an ejection linkage assembly corresponding to the position of the lower mold seat 42, in this embodiment, the ejection linkage assembly is integrated in the inside of the lower mold seat 42, and the stable ejection of the plastic part is realized through mechanical linkage, avoiding the deformation problem of the plastic part caused by the traditional ejection mode.

[0040] Referring to Figure 5 As shown, the ejection linkage assembly includes a push-out sliding plate 65 arranged in the inside of the lower mold seat 42, a first push rod 66 arranged in the inside of the lower mold seat 42, two telescopic hinge rods 67 connected to the first push rod 66 and the push-out sliding plate 65, and an ejection piece 68 arranged on the telescopic hinge rod 67.

[0041] The push-out sliding plate 65 is located in the second groove body 554 and is in sliding connection with the second groove body 554, the push-out sliding plate 65 is fixedly installed with a second push rod 651 corresponding to the first push rod 66, the first push rod 66 is arranged in parallel in the inside of the lower mold seat 42, the first push rod 66 is located in the inside of the lower mold seat 42, the two telescopic hinge rods 67 are arranged in symmetry, in this embodiment, each telescopic hinge rod 67 is connected by a pin shaft through two rod bodies, forming a foldable "<" shape structure initial state, a torsional spring is sleeved at the connecting position of the two rod bodies, the torsional spring is in a natural relaxation state, providing a pre-tightening force of contraction tendency for the telescopic hinge rod 67, the two ends of the telescopic hinge rod 67 are rotatably connected with the second push rod 651 and the first push rod 66, and the telescopic hinge rod 67 is rotatably connected with the second push rod 651 and the first push rod 66, in this embodiment, the symmetrical layout enables the telescopic hinge rod 67 to drive the second push rod 651 and the first push rod 66 to move synchronously when the telescopic hinge rod 67 is stressed, avoiding the push rod jam caused by unilateral stress.

[0042] It should be noted that the telescopic hinge rod 67 has a length ratio of 1:1, an initial "<" shape included angle of 60°, a torsion spring made of 60Si2Mn material, a wire diameter of 2 mm, a free length of 30 mm, a pre-tightening torque of 1.5 N·m, a reset spring 683 made of 50CrVA material, a wire diameter of 3 mm, a free length of 40 mm, and a stiffness of 10 N / mm, which ensures that the ejection force of each second ejector rod 682 is consistent.

[0043] Referring to Figure 8 As shown, the ejector 68 includes four first ejector rods 681 fixedly installed on the lower mold base 42. In the embodiment, the first ejector rods 681 are fixed in a rectangular array at the bottom of the cavity of the lower mold base 42, and the rod bodies are hollow structures. The first ejector rods 681 are slidably connected with second ejector rods 682. In the embodiment, the second ejector rods 682 are adapted to be inserted into the interiors of the first ejector rods 681, and in the initial state, the top portions are flush with the bottom surface of the cavity. The interiors of the first ejector rods 681 are installed with reset springs 683 and traction pistons 685. The traction pistons 685 are in sliding fit with the inner walls of the first ejector rods 681. The upper ends of the reset springs 683 are fixedly connected with the bottoms of the second ejector rods 682, and the lower ends are fixedly connected with the upper ends of the traction pistons 685, forming a series connection structure of the second ejector rods 682, the reset springs 683, and the traction pistons 685.

[0044] Referring to Figure 9 As shown, the first push rod 66 and the second push rod 651 are respectively connected with traction ropes 684, which are equipped with automatic tensioners and corrugated tube protections, and the ejection synchronization error is ≤0.15 mm. The traction ropes 684 penetrate through the traction pistons 685 and are fixedly connected with the traction pistons 685. The two traction ropes 684 are always in a taut state.

[0045] The two ends of the traction rope 684 on the first push rod 66 respectively extend into two first ejector rods 681 close to the second push rod 651, and form indirect transmission through the traction piston 685 and the corresponding second ejector rod 682. The two ends of the traction rope 684 on the second push rod 651 respectively extend into two first ejector rods 681 close to the first push rod 66, and also form indirect transmission through the traction piston 685 and the corresponding second ejector rod 682. This symmetrical connection mode ensures that the four second ejector rods 682 can be synchronously stressed and ejected, avoiding warping or damage of the plastic parts due to uneven stress.

[0046] Referring to Figure 10As shown, the upper end of the second ejector rod 682 is movably connected with an ejector plate 687, the ejector plate 687 is designed to be wide at the upper end and narrow at the lower end, in this embodiment, the contact area with the plastic part is increased and the cavity space is reduced, the through hole 686 is arranged on the second ejector rod 682 and the ejector plate 687, and the through holes 686 of the two are in communication, in this embodiment, when the ejector pulling piston 685 moves upward, the air inside the first ejector rod 681 is compressed, the compressed air is discharged from the gap between the ejector plate and the plastic part through the through hole 686, the airflow assists the separation of the plastic part and the mold, and the demolding reliability is further improved.

[0047] Reference Figure 11 And Figure 12 As shown, the ejector 68 includes four first ejector rods 681 fixedly connected to the lower mold base 42, the first ejector rod 681 is movably connected with a second ejector rod 682, a return spring 683 is fixedly connected inside the first ejector rod 681, the upper end of the return spring 683 is fixedly connected with the bottom of the second ejector rod 682, the first push rod 66 and the second push rod 651 are respectively connected with a pulling rope 684, the two pulling ropes 684 are always in a taut state, it should be noted that the pulling rope 684 is provided with an automatic tensioner and a corrugated pipe protection, the ejection synchronization error is ≤0.15mm, wherein the two ends of the pulling rope 684 on the first push rod 66 extend into the two first ejector rods 681 close to the second push rod 651 and are fixedly connected with the bottoms of the corresponding second ejector rods 682, and the two ends of the pulling rope 684 on the second push rod 651 extend into the two first ejector rods 681 close to the first push rod 66 and are fixedly connected with the bottoms of the corresponding second ejector rods 682.

[0048] It should be noted that the pulling rope 684 is made of 304 stainless steel coated with Teflon composite pulling rope, the inner layer is a 304 stainless steel rope core with a diameter of 1.5mm, the breaking tension is ≥2000N, the initial elongation is ≤0.5%, the mechanical strength is ensured, the outer layer Teflon coating thickness is 0.02-0.03mm, the friction coefficient is ≤0.08, the temperature resistance range is -60-260℃, and the conventional working temperature of 200-250℃ around the mold cavity can be directly resisted, after 1000 hours of continuous work in a 250℃ constant temperature environment, the coating integrity rate is ≥95%, the rope body elongation is ≤0.1mm, and the heat environment use requirement of the injection molding machine is met.

[0049] When the plastic part is finished injection molding and cooling, the mold group switches to the part taking station ③, the transmission block 553 of the power mechanism 5 slides along the second groove body 554, pushes the ejection slide plate 65 to move, the ejection slide plate 65 drives the second push rod 651 to move close to the first push rod 66, extrudes the telescopic hinge 67 arranged symmetrically to reduce the "<" shape angle, and then drives the first push rod 66 and the second push rod 651 to move synchronously, the first push rod 66 and the second push rod 651 pull the traction rope 684 when moving, the traction rope 684 is always taut, the traction rope 684 drives the traction piston 685 fixed thereto to slide upward along the inner wall of the first top rod 681, the traction piston 685 moves upward to extrude the return spring 683, the return spring 683 stores elastic potential energy by compression and pushes the second top rod 682 to slide upward along the first top rod 681, the top plate 687 synchronously lifts the plastic part, at the same time, the compressed air in the first top rod 681 is discharged through the through hole 686, the airflow assists the plastic part to separate from the cavity, after the plastic part is taken out, the transmission block 553 resets to pull the ejection slide plate 65 back, the telescopic hinge 67 expands under the action of the torsional spring, drives the first push rod 66 and the second push rod 651 to separate and pull the traction rope 684, the traction piston 685 moves downward, the return spring 683 is stretched and reset, and the second top rod 682 falls back to the initial position flush with the bottom surface of the cavity, ready for the next ejection.

[0050] In use, the following steps are included: S1, raw material preparation: add thermoplastic plastic particles into the hopper 31, fall into the heating cylinder 32 through the flange, heat the heating cylinder 32 by the multi-temperature control zone ceramic heating sheet, drive the gradual pitch screw rod 33 to rotate by the servo motor, gradually push the particles to the end of the heating cylinder 32 to melt and stir to form a melt that can be injection molded; S2, mold alignment: the power motor 51 drives the power gear 52 to rotate, drives the arc plate 54 to move through the power rod 53, makes the transmission rod 551 slide along the L-shaped composite channel, pushes the transmission block 553 to move along the second groove body 554 to realize the mold group station switching, when switching, the guide sleeve block 61 first positions the upper segment roughly, then positions the lower segment precisely after buffering by the compression spring, the auxiliary push rod 632 extrudes the delay spring 642 to push the delay push block 641 to fit the transmission rod 551, realizes the in-place delay stability after fitting; S3, injection molding operation: the mold locking mechanism 7 drives the upper mold base 41 and the lower mold base 42 to close, the lifting frame 71 drives the injection molding mechanism 3 to descend, adjusts the injection nozzle 34 and the gate sleeve 411 precisely by the laser sensor and the fine adjustment cylinder, the injection molding mechanism 3 injects the melt into the cavity, the mold locking cylinder adjusts the mold locking force according to the injection pressure, completes the pressure maintaining and cooling; S4, the plastic parts are ejected: after the mold is opened, the transmission block 553 pushes the ejection slide 65, so that the second push rod 651 extrudes the telescopic hinge 67 to reduce the included angle, drives the first push rod 66 and the second push rod 651 to move towards each other, the push rod pulls the traction rope 684 to drive the traction piston 685 to move upwards, extrudes the reset spring 683 to push the second ejector rod 682 to move upwards, the top plate 687 ejects the plastic parts, and the compressed air in the first ejector rod 681 is discharged through the through hole 686 to assist in demolding; S5, cycle reset: after the plastic parts are taken out, the torsional spring drives the telescopic hinge 67 to unfold, the push rod returns and pulls back the traction rope 684, the reset spring 683 pushes the second ejector rod 682 and the traction piston 685 to reset, the power mechanism 5 drives the mold group to switch to the next station, and S2-S4 are repeated to realize continuous production.

[0051] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can make equivalent replacements or changes according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A vertical thermoplastic material injection molding machine, comprising a frame (1) and an operating table (2), characterized in that: The operating table (2) is installed on the upper end of the frame (1). An injection molding mechanism (3) for processing plastic granule raw materials is installed on the upper end of the frame (1). A mold mechanism (4) is installed on the operating table (2) at the lower end of the injection molding mechanism (3). A power mechanism (5) is installed at the lower end of the mold mechanism (4). The mold mechanism (4) includes four corresponding upper mold bases (41) and lower mold bases (42). The lower mold base (42) is located at the upper end of the frame (1). The lower end of the lower mold base (42) is connected to the power mechanism (5). The upper mold base (41) and the lower mold base (42) are detachably matched and can achieve mold closing. The upper end of the upper mold base (41) is fixedly connected to the sprue sleeve (411). The sprue sleeve (411) is connected to the injection molding mechanism (3). The power mechanism (5) drives the mold mechanism (4) to change position and cooperate with the injection molding mechanism (3) to complete the injection molding operation.

2. A vertical thermoplastic material injection molding machine according to claim 1, characterized in that: The power mechanism (5) includes a power motor (51) mounted on the operating table (2). The output end of the power motor (51) is fixedly connected to a power wheel (52). Four power rods (53) arranged in a ring are rotatably connected to the power wheel (52). Each power rod (53) is rotatably connected to an arc plate (54). A transmission component (55) for transmission is installed on the arc plate (54).

3. A vertical thermoplastic material injection molding machine according to claim 2, characterized in that: The transmission component (55) includes a transmission rod (551) rotatably mounted on one end of the arc plate (54). The operating table (2) has a first groove (552) adapted to the transmission rod (551). The first groove (552) and the transmission rod (551) are slidably connected. One end of the transmission rod (551) is rotatably connected to a transmission block (553). The lower end of the lower mold base (42) has a second groove (554). The transmission block (553) and the second groove (554) are slidably connected. The operating table (2) has a third groove (555). The groove wall of the third groove (555) is in contact with the end of the transmission rod (551) away from the arc plate (54). The third groove (555) and the first groove (552) are interconnected on the surface of the operating table (2) to jointly limit the movement trajectory of the transmission rod (551).

4. A vertical thermoplastic material injection molding machine according to claim 3, characterized in that: The mold mechanism (4) has an adaptive positioning component at the bottom of the lower mold base (42). The adaptive positioning component includes guide sleeves (61) welded to the four corners of the bottom of the lower mold base (42) and pre-guide pins (62) fixed at the corresponding mold positions on the operating table (2). A compression spring is sleeved on the lower end of the pre-guide pins (62), and the inner diameter of the guide sleeves (61) shrinks in a stepped manner from top to bottom.

5. A vertical thermoplastic material injection molding machine according to claim 4, characterized in that: The adaptive positioning component also includes an auxiliary component (63) and a delay component (64). The auxiliary component (63) includes an auxiliary turntable (631) rotatably installed inside the operating table (2). The auxiliary turntable (631) is fixedly installed on the output end of the power motor (51). Four auxiliary push rods (632) are fixedly installed on the auxiliary turntable (631). An auxiliary rotating ring (633) is fixedly connected inside the operating table (2), and the ends of the four auxiliary push rods (632) are evenly sleeved on the auxiliary rotating ring (633) and are slidably connected to the auxiliary rotating ring (633).

6. A vertical thermoplastic material injection molding machine according to claim 5, characterized in that: The delay component (64) includes four delay push blocks (641) sleeved on the auxiliary rotating ring (633). The delay push blocks (641) are slidably connected to the auxiliary rotating ring (633). The delay push blocks (641) are connected to the ends of the auxiliary push rod (632) through delay springs (642). Both ends of the delay springs (642) are fixedly connected to the auxiliary push rod (632) and the delay push blocks (641).

7. A vertical thermoplastic material injection molding machine according to claim 6, characterized in that: The operating table (2) is provided with an ejection linkage component at the position corresponding to the lower mold base (42); The ejection linkage assembly includes an ejection slide plate (65) disposed inside the lower mold base (42), a first push rod (66) disposed inside the lower mold base (42), two telescopic hinge rods (67) connected to the first push rod (66) and the ejection slide plate (65), and an ejector (68) disposed on the telescopic hinge rods (67). The ejector plate (65) is located inside the second groove (554) and is slidably connected to the second groove (554). A second push rod (651) corresponding to the first push rod (66) is fixedly installed on the ejector plate (65). The first push rod (66) is arranged parallel inside the lower mold base (42). The two telescopic hinge rods (67) are arranged symmetrically and are initially shaped like "<". Their tips are movably connected and a torsion spring is provided at the tip connection. The two ends of the telescopic hinge rod (67) are rotatably connected to the second push rod (651) and the first push rod (66) respectively. The telescopic hinge rod (67) is rotatably connected to the second push rod (651) and the first push rod (66).

8. A vertical thermoplastic material injection molding machine according to claim 7, characterized in that: The ejector (68) includes four first ejector rods (681) fixedly installed on the lower mold base (42). A second ejector rod (682) is slidably connected to the first ejector rod (681). A return spring (683) is installed inside the first ejector rod (681). A traction piston (685) is also slidably connected inside the first ejector rod (681). The upper end of the traction piston (685) is fixedly connected to the lower end of the return spring (683). The upper end of the return spring (683) is fixedly connected to the bottom of the second ejector rod (682). The first push rod (66) and the second push rod (651) are respectively connected to traction ropes (684). The traction ropes (684) pass through the traction piston (685) and are fixedly connected to the traction piston (685). The two traction ropes (684) are always taut. The two ends of the traction ropes (684) on the first push rod (66) extend into the two first push rods (681) near the direction of the second push rod (651) and form a transmission connection with the bottom of the corresponding second push rod (682) through the traction piston (685). The two ends of the traction ropes (684) on the second push rod (651) extend into the two first push rods (681) near the direction of the first push rod (66) and form a transmission connection with the bottom of the corresponding second push rod (682) through the traction piston (685). A top plate (687) is movably installed on the upper end of the second top rod (682). The top plate (687) is designed to be wider at the top and narrower at the bottom. Both the second top rod (682) and the top plate (687) have through holes (686) that are connected to each other.

9. An operating method for a vertical thermoplastic material injection molding machine, as described in claim 8, characterized in that, Includes the following steps: S1. Raw material preparation: Add thermoplastic plastic granules to the hopper (31), and drop them into the heating cylinder (32) through the flange. The heating cylinder (32) is heated by a multi-temperature-controlled ceramic heating plate. The servo motor drives the gradually changing pitch screw (33) to rotate, gradually pushing the granules to the end of the heating cylinder (32) to melt and stir and homogenize, forming an injection-molten melt. S2, Mold Alignment: The power motor (51) drives the power wheel (52) to rotate, and drives the arc plate (54) to move through the power rod (53), so that the transmission rod (551) slides along the L-shaped composite channel, and pushes the transmission block (553) to move along the second groove (554) to realize the module station switching. During the switching, the guide sleeve (61) is first roughly positioned with the upper section of the pre-guide pin (62), and then finely positioned with the lower section after being buffered by the compression spring. The auxiliary push rod (632) squeezes the delay spring (642) to push the delay push block (641) to fit with the transmission rod (551) to achieve delayed stability after being in place. S3, Injection Molding Operation: The clamping mechanism (7) drives the upper mold base (41) and the lower mold base (42) to close the mold. The lifting frame (71) drives the injection mechanism (3) to descend. The injection nozzle (34) and the sprue sleeve (411) are precisely aligned through the laser sensor and the fine-tuning cylinder. The injection mechanism (3) injects the melt into the cavity. The clamping cylinder adjusts the clamping force according to the injection pressure to complete the pressure holding and cooling. S4, Plastic part ejection: After the mold is opened, the transmission block (553) pushes the ejection slide (65), causing the second push rod (651) to squeeze the telescopic hinge rod (67) to reduce the included angle, driving the first push rod (66) and the second push rod (651) to move towards each other. The push rod pulls the traction rope (684) to drive the traction piston (685) to move upward, squeezing the reset spring (683) to push the second ejector rod (682) to move upward, and the top plate (687) ejects the plastic part. At the same time, the compressed air in the first ejector rod (681) is discharged through the through hole (686) to assist in demolding. S5, Cyclic Reset: After the plastic part is removed, the torsion spring drives the telescopic hinge (67) to unfold, the push rod returns to its original position and pulls back the traction rope (684), the reset spring (683) pushes the second push rod (682) and the traction piston (685) to reset, the power mechanism (5) drives the module to switch to the next work station, and repeats S2-S4 to achieve continuous production.

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