A transparent plastic cup lid injection molding machine and operating method

Abstract

This invention relates to the field of cup lid injection molding machines, specifically a transparent plastic cup lid injection molding machine and its operating method. The machine includes a support base, with a screw injection molding machine body fixedly connected to the upper left side of the support base. A accumulator cylinder is fixedly connected to the right end of the screw injection molding machine body, and a one-way valve is fixedly connected between the top of the accumulator cylinder and the screw injection molding machine body. This transparent plastic cup lid injection molding machine consists of an extrusion adjustment mechanism and a mold switching mechanism. A motor drives the mold switching mechanism, causing the support plate to rotate four sets of upper and lower molds ninety degrees in stages, switching the positions of the four sets of upper and lower molds. After the upper and lower mold positions are switched, the upper and lower molds on the left side are pressed against the conical nozzle by a T-shaped pressure plate via a guide sleeve for injection molding. Meanwhile, the upper and lower molds on the right side of the support tube are opened and unloaded. This cyclical division of labor improves injection molding production efficiency.

Description

Technical Field

[0001] This invention relates to the field of cup lid injection molding machines, specifically to a transparent plastic cup lid injection molding machine and its operating method. Background Technology

[0002] Injection molding, also known as injection molding, is a molding method that combines injection and molding. It uses a screw to stir and completely melt plastic material, injects it into a mold cavity under high pressure, and obtains the molded product after cooling and solidification. The transparent plastic cup lid of a plastic cup is usually processed by an injection molding machine.

[0003] An existing patent (publication number: CN113370456B) discloses a semi-automatic plastic extrusion mechanism for cup lid molding, including a cup lid injection mold, an injection table, and a feeding structure. In implementing this solution, the invention discovered the following unresolved issues in the prior art: 1. During the use of this injection molding machine, the mold must first be closed, then injection molding, followed by mold opening and unloading, and then mold closing again for the next injection. This process involves numerous steps, affecting production efficiency; 2. Because the injection molding machine uses a screw to agitate and convey material, injecting it into the mold cavity under high pressure, and is under continuous pressure during injection, when the mold experiences wear and tear over time, excess material will be squeezed out from these gaps. Some existing injection molding machines adjust the injection volume, affecting injection quality. Summary of the Invention

[0004] The purpose of this invention is to provide a transparent plastic cup lid injection molding machine and its operating method to solve the problems mentioned in the background art: 1. Some existing injection molding equipment has low working efficiency during use; 2. Some existing injection molding machines are difficult to adjust the injection volume during use. When the mold has wear gaps, excess raw material will be squeezed out from the gaps, affecting the injection quality. To achieve the above objectives, this invention provides the following technical solution: A transparent plastic cup lid injection molding machine, including a support base, a screw injection molding machine body fixedly connected to the upper left side of the support base, a accumulator cylinder fixedly connected to the right end of the screw injection molding machine body, a one-way valve fixedly connected between the top of the accumulator cylinder and the screw injection molding machine body, and a material extrusion adjustment mechanism movably connected inside the accumulator cylinder;

[0005] A support tube is vertically fixed to the right side of the support base, and a mold switching mechanism that cooperates with the extrusion adjustment mechanism is movably connected between the upper part of the support tube and the top of the support base.

[0006] Preferably, the extrusion adjustment mechanism includes a support rod, which is fixedly connected to the inner bottom surface of the storage cylinder. A support ring is rotatably connected to the upper part of the support rod, and U-shaped hinge plates are fixedly connected to both sides of the support ring.

[0007] A main pressure plate is slidably connected to the left side of the inner wall of the storage cylinder, and a secondary pressure plate is slidably connected to the right side of the inner wall of the storage cylinder. An extrusion tube is fixedly connected to the right side of the secondary pressure plate. The middle part of the extrusion tube is movably inserted through the right side of the storage cylinder. A circular hole that mates with the extrusion tube is opened in the middle of the secondary pressure plate. A connecting rod is movably connected to the side opposite to the main pressure plate of the secondary pressure plate. The two connecting rods correspond one-to-one with the two U-shaped hinge plates. One end of each of the two connecting rods is hinged inside the two U-shaped hinge plates.

[0008] The left side of the storage cylinder is threaded with an adjusting screw, and the right end of the adjusting screw is fixedly connected with a pressing plate. The side wall of the pressing plate overlaps with the left side of the main pressing plate.

[0009] A conical nozzle is slidably connected to the right side of the extrusion tube. A retaining ring is fixedly sleeved on the outer wall of the extrusion tube. A compression spring is fixedly connected between the side wall of the retaining ring and the side wall of the conical nozzle. A pressure rod is fixedly connected to the inner wall of the conical nozzle. A support frame is fixedly connected to the right side of the inner wall of the extrusion tube. A conical sealing head is slidably connected to the middle of the support frame. The right side of the conical sealing head overlaps with the right side of the inner wall of the extrusion tube. A short spring is movably connected between the left side of the conical sealing head and the right side of the support frame.

[0010] Preferably, a crossbar is fixedly connected to the middle of the pressure plate, and a hinge block is fixedly connected to the middle of both the crossbar and the middle of the main pressure plate. The opposite ends of the two connecting rods are respectively hinged to the middle of the corresponding hinge block.

[0011] Preferably, a limiting block is symmetrically fixedly connected to the left side of the inner wall of the storage cylinder, and the left side of the main pressing plate overlaps with the side wall of the limiting block.

[0012] A perforation is provided on the right side of the storage cylinder, and the extrusion tube is movably inserted inside the perforation.

[0013] Preferably, the mold switching mechanism includes a motor, which is fixedly connected to the right side of the top of the support base. An adjusting rod is fixedly connected to the rotating end of the motor, and a convex limiting plate is fixedly connected to the top of the adjusting rod. An adjusting pin is rotatably connected to the top of the convex limiting plate.

[0014] A support plate is rotatably connected to the middle of the outer wall of the support tube, and a linkage plate is fixedly connected to the bottom of the support plate. The linkage plate has pin grooves around its perimeter that cooperate with the adjusting pins. The side wall of the linkage plate overlaps with the side wall of the upper part of the convex limiting plate.

[0015] A pad is fixedly connected to the top of the support base, a main loop guide sleeve is movably connected to the upper part of the pad, the middle part of the main loop guide sleeve is movably sleeved on the lower part of the support tube, a toothed plate is fixedly connected to the right side of the main loop guide sleeve, and a half toothed ring that cooperates with the toothed plate is fixedly sleeved on the lower part of the adjusting rod.

[0016] A transmission rod is vertically slidably connected inside the support tube. Guide shafts are fixedly connected to the upper and lower parts of the transmission rod. Guide grooves are symmetrically opened on the front and rear sides of the support tube. The two ends of the upper guide shaft of the transmission rod correspond one-to-one with the two guide grooves on the upper part of the support tube, and the two ends of the lower guide shaft of the transmission rod correspond one-to-one with the two guide grooves on the lower part of the support tube. The end of the guide shaft is slidably connected inside the corresponding guide groove. A limit ring is fixedly connected to the middle of the transmission rod, and a pressing spring is fixedly connected between the top of the limit ring and the inner wall of the support tube.

[0017] The upper part of the support tube is movably sleeved with a concave guide sleeve. The front and rear sides of the concave guide sleeve and the front and rear sides of the main concave guide sleeve are provided with inclined grooves. The two ends of the upper guide shaft of the transmission rod correspond one-to-one with the two inclined grooves on the concave guide sleeve, and the two ends of the lower guide shaft of the transmission rod correspond one-to-one with the two inclined grooves on the main concave guide sleeve. One end of the guide shaft extends through the guide groove to the interior of the corresponding inclined groove. A T-shaped pressure plate is fixedly connected to the left side of the concave guide sleeve.

[0018] The top of the support plate is equidistantly connected with four lower molds along the circumference. The top of the lower molds is movably connected with an upper mold that cooperates with a T-shaped pressure plate. The side wall of the upper mold is fixedly connected with a positioning sleeve that cooperates with the extrusion adjustment mechanism.

[0019] Four positioning blocks are fixedly connected at equal intervals along the circumference of the top of the support plate. The four positioning blocks correspond one-to-one with the four lower molds. A return spring is fixedly connected between the side wall of the positioning block and the side wall of the adjacent lower mold.

[0020] An adjusting plate is rotatably connected to the upper part of the support tube. Four rectangular slots are equidistantly opened on the surface of the adjusting plate along the circumference. A rectangular block is slidably connected inside the rectangular slot. A pull rod is movably inserted in the middle of the rectangular block. The four pull rods correspond one-to-one with the four upper dies. The bottom of the pull rod is fixedly connected to the top of the corresponding upper die. A guide roller is fixedly connected to the upper part of the pull rod. A main trapezoidal guide plate that cooperates with the guide roller is fixedly connected to the right side of the top of the support tube. A secondary trapezoidal guide plate that cooperates with the guide roller is fixedly connected to the left side of the top of the support tube.

[0021] Preferably, the linkage plate is provided with arc-shaped surfaces on all four sides, and the arc-shaped surface of the side wall of the linkage plate overlaps with the arc-shaped surface of the upper part of the convex limiting plate.

[0022] Both the linkage plate and the support plate have through holes in their middle sections that mate with the support tube. A support bearing is fixedly connected between the inner wall of the through hole and the surface of the support tube.

[0023] Preferably, a T-shaped slide rod is fixedly connected to the left side of the main guide sleeve, the T-shaped slide rod is movably inserted through the upper part of the pad, and a return spring is movably connected between the left side of the pad and the left end of the T-shaped slide rod.

[0024] A method for using a transparent plastic cup lid injection molding machine includes the following steps:

[0025] S1. When using this plastic cup lid injection molding machine, the injection material is first conveyed into the accumulator cylinder through the screw injection molding machine body. During the replenishment of the injection material, the main pressure plate on the left side of the inner wall of the accumulator cylinder moves to the left limit position, while the conical sealing head inside the extrusion tube seals the right end of the extrusion tube, causing the pressure plate to move to the right limit position along with the extrusion tube. At this time, the material inside the accumulator cylinder is full. At the same time, the motor is started and the adjusting rod rotates clockwise, causing the adjusting rod to rotate with the convex limit plate and the adjusting pin. When the adjusting pin rotates along the circular trajectory to the pin groove position opened on the side wall of the linkage plate, the adjusting pin is inserted into the corresponding pin groove and rotates synchronously with the linkage plate and the support plate on the surface of the support tube. After the adjusting pin rotates once, the linkage plate rotates ninety degrees with the support plate, switching the four lower mold positions on the top of the support plate.

[0026] S2. After the support plate rotates the lower mold 90 degrees, one of the lower molds and the corresponding upper mold rotate to the right end of the conical nozzle. Meanwhile, the continuously rotating adjusting rod, along with the semi-toothed ring, engages with the toothed plate on the main guide sleeve, causing the toothed plate to move the main guide sleeve to the right. During the sliding process between the inclined groove on the main guide sleeve and the guide shaft sliding on the support tube, the guide shaft carries the transmission rod upwards inside the support tube. At this time, the guide shaft at the top of the transmission rod engages with the inclined groove on the guide sleeve, causing the guide sleeve to move from right to left, carrying the T-shaped pressure plate, pressing the corresponding lower and upper molds towards the conical nozzle. Then, the positioning sleeve on the side wall of the upper mold engages with the position of the conical nozzle, causing the conical nozzle to... The nozzle moves to the left under pressure on the surface of the extrusion tube. At this time, the pressure rod inside the conical nozzle presses against the conical sealing head to release the seal on the right end of the extrusion tube. As the lower mold continues to move to the left, the extrusion tube moves from the pressure plate to the main pressure plate. With the cooperation of the connecting rod, support rod and support ring, the two connecting rods move at opposite ends, so that the main pressure plate and the secondary pressure plate are in a relative moving state. Under the action of the one-way valve, the raw material inside the accumulator will not enter the screw injection molding machine body. The raw material between the main pressure plate and the secondary pressure plate enters the upper mold and the lower mold in a metered manner from the position of the extrusion tube and the conical nozzle. The metered injection of raw material is determined according to the distance between the main pressure plate and the secondary pressure plate.

[0027] S3. After the upper and lower molds on the left side of the support plate have finished feeding, the rotating half-tooth ring disengages from the toothed plate on the side wall of the main guide sleeve. Under the elastic recovery of the pressing spring, the main guide sleeve, transmission rod, and the secondary guide sleeve, along with the T-shaped pressure plate, reset. At the same time, the return spring resets the corresponding lower and upper molds, disengaging them from the conical nozzle. At this time, the short spring inside the extrusion tube resets the conical sealing head to seal the position of the extrusion tube. Then, the one-way valve opens, and the raw material inside the screw injection molding machine body flows back into the space between the main pressure plate and the secondary pressure plate for replenishment. By rotating the adjusting screw, the pressing plate is pushed against the main pressure plate. At this time, with the cooperation of the connecting rod and the support ring, the main pressure plate and the secondary pressure plate move relative to or away from each other, adjusting the space between the main pressure plate and the secondary pressure plate to control the amount of material to be fed next time.

[0028] S4. Because the support plate will rotate the lower and upper molds at the top in stages by 90 degrees, when the lower and upper molds after injection are rotated to the right side of the support tube, the tie rod and guide roller at the top of the upper mold rotate to the position of the main trapezoidal guide plate on the right side of the top of the support tube. The guide roller slides along the trajectory of the main trapezoidal guide plate and carries the tie rod upward, so that the tie rod carries the upper mold upward to perform mold opening and unloading operations. The four continuously rotating lower molds and four upper molds are combined and sequentially cooperate with the conical nozzle to perform injection molding, avoiding mold opening and unloading operations at the injection position.

[0029] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0030] In this invention, the use of components such as a conical nozzle, a support tube, and a mold switching mechanism, along with the operation of the mold switching mechanism driven by a motor, causes the support plate to rotate 90 degrees in stages with four sets of upper and lower molds, switching their positions. After the upper and lower mold positions are switched, the upper and lower molds on the left side are pressed against the conical nozzle by the T-shaped pressure plate through the guide sleeve for injection molding, while the upper and lower molds on the right side of the support tube are opened and unloaded. This cyclical division of labor effectively improves injection molding production efficiency.

[0031] In this invention, through the coordinated use of components such as the accumulator, main pressure plate, and secondary pressure plate, when the positioning sleeve on the side wall of the upper mold presses against the conical nozzle, the conical nozzle moves under pressure on the surface of the extrusion tube, causing the conical sealing head inside the extrusion tube to release its seal. At the same time, the extrusion tube moves from the secondary pressure plate towards the main pressure plate. Under the action of the support ring and connecting rod, the main pressure plate and the secondary pressure plate move relative to each other, quantitatively extruding the raw material inside the accumulator from the extrusion tube into the interior of the upper mold. After injection molding is completed, the recovery guide sleeve promptly resets the upper and lower molds. At this time, the resetting conical sealing head seals the right end of the extrusion tube, preventing the mold cavity from being under pressure for a long time and improving the injection molding quality.

[0032] In this invention, by adjusting the screw sleeve, main pressure plate, and support ring, when the adjusting screw is rotated and the pressing plate is moved, the pressing plate will press against the main pressure plate and move towards the secondary pressure plate. With the cooperation of the support ring and the connecting rod, the secondary pressure plate will also move towards the main pressure plate, thereby adjusting the material storage space between the main pressure plate and the secondary pressure plate. Since the distance the upper mold moves towards the conical nozzle is fixed, the closer the conical nozzle on the extrusion tube is to the adjacent upper mold, the more raw material is injected, and vice versa, thus effectively controlling the amount of material injected. Attached Figure Description

[0033] Figure 1 This is a front view of a portion of the support base and support plate of the present invention;

[0034] Figure 2 For the present invention Figure 1 Enlarged view of the structure at point A in the middle;

[0035] Figure 3 This is a top sectional view of a portion of the material storage cylinder and the main pressure plate of the present invention;

[0036] Figure 4 This is a top sectional view of a portion of the extrusion tube and the conical nozzle of the present invention;

[0037] Figure 5 This is a top sectional view of a portion of the semi-toothed ring and the main guide sleeve of the present invention;

[0038] Figure 6 This is a top sectional view of a portion of the linkage plate and the convex limiting plate of the present invention;

[0039] Figure 7 This is a cross-sectional view of a portion of the support tube and transmission rod of the present invention;

[0040] Figure 8 This is a top view showing the positions of the adjusting plate and the main trapezoidal guide plate of the present invention;

[0041] Figure 9 This is a perspective view of a partial position of the main trapezoidal guide plate and guide roller of the present invention;

[0042] Figure 10 This is a cross-sectional view of a portion of the position of the adjusting plate and the rectangular groove in this invention.

[0043] In the diagram: 1. Support base; 2. Screw injection molding machine body; 3. Storage cylinder; 4. One-way valve; 5. Extrusion adjustment mechanism; 501. Support rod; 502. Support ring; 503. U-shaped hinge plate; 504. Main pressure plate; 505. Slave pressure plate; 506. Extrusion tube; 507. Round hole; 508. Connecting rod; 509. Adjusting screw; 510. Pressing plate; 511. Conical nozzle; 512. Retaining ring; 513. Extrusion spring; 514. Pressure rod; 515. Support frame; 516. Conical sealing head; 517. Short spring; 6. Support tube; 7. Mold switching mechanism; 701. Motor; 702. Adjusting rod; 703. Convex limit plate; 704. 705. Adjusting pin; 706. Support plate; 707. Linkage plate; 708. Pin groove; 709. Pad block; 7000. Main guide sleeve; 710. Toothed plate; 711. Half toothed ring; 712. Transmission rod; 713. Guide shaft; 714. Guide groove; 715. Limiting ring; 716. Pressing spring; 717. Follower guide sleeve; 718. Inclined groove; 719. T-shaped pressure plate; 720. Lower die; 721. Upper die; 722. Positioning sleeve; 723. Positioning block; 724. Return spring; 725. Adjusting plate; 726. Rectangular groove; 727. Rectangular block; 728. Pull rod; 729. Guide roller; 730. Main trapezoidal guide plate; 731. Follower trapezoidal guide plate. Detailed Implementation

[0044] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] Please see Figures 1 to 10 This invention provides a technical solution: a transparent plastic cup lid injection molding machine, including a support base 1. A screw injection molding machine body 2 is fixedly connected to the upper left side of the support base 1. A material storage cylinder 3 is fixedly connected to the right end of the screw injection molding machine body 2. A one-way valve 4 is fixedly connected between the top of the material storage cylinder 3 and the screw injection molding machine body 2. An extrusion adjustment mechanism 5 is movably connected inside the material storage cylinder 3. It should be noted that the one-way valve 4 is configured to allow the raw material inside the screw injection molding machine body 2 to enter the material storage cylinder 3, while preventing the raw material inside the material storage cylinder 3 from entering the screw injection molding machine body 2.

[0046] A support tube 6 is vertically fixedly connected to the right side of the support base 1, and a mold switching mechanism 7 that cooperates with the extrusion adjustment mechanism 5 is movably connected between the upper part of the support tube 6 and the top of the support base 1.

[0047] In this embodiment, as Figures 1 to 10As shown, the extrusion adjustment mechanism 5 includes a support rod 501, which is fixedly connected to the inner bottom surface of the storage cylinder 3. A support ring 502 is rotatably connected to the upper part of the support rod 501, and U-shaped hinge plates 503 are fixedly connected to both sides of the support ring 502. It should be noted that a connecting bearing is fixedly connected between the inner ring of the support ring 502 and the surface of the support rod 501.

[0048] A main pressure plate 504 is slidably connected to the left side of the inner wall of the storage cylinder 3, and a secondary pressure plate 505 is slidably connected to the right side of the inner wall of the storage cylinder 3. An extrusion pipe 506 is fixedly connected to the right side of the pressure plate 505. The middle part of the extrusion pipe 506 is movably inserted through the right side of the storage cylinder 3. A round hole 507 that matches the extrusion pipe 506 is opened in the middle of the pressure plate 505. A connecting rod 508 is movably connected to the side opposite to the main pressure plate 504 of the pressure plate 505. The two connecting rods 508 correspond one-to-one with the two U-shaped hinge plates 503. One end of the two connecting rods 508 is respectively hinged inside the two U-shaped hinge plates 503. It should be noted that the main pressure plate 504 and the slave pressure plate 505 are set as piston plates to ensure the sealing between the main pressure plate 504 and the slave pressure plate 505 and the inner wall of the storage cylinder 3; under the action of the round hole 507 in the middle of the slave pressure plate 505, the raw material inside the storage cylinder 3 can enter the interior of the extrusion pipe 506.

[0049] An adjusting screw 509 is threadedly connected to the left side of the accumulator 3. A pressing plate 510 is fixedly connected to the right end of the adjusting screw 509. The side wall of the pressing plate 510 overlaps with the left side of the main pressing plate 504. It should be noted that when the adjusting screw 509 is rotated to move the pressing plate 510, the pressing plate 510 presses against the main pressing plate 504 and moves it horizontally inside the accumulator 3. At this time, the connecting rod 508 on the main pressing plate 504 presses against the hinged U-shaped hinge plate 503 and the support ring 502 and rotates on the surface of the support rod 501. Meanwhile, the U-shaped hinge plate 503 on the other side of the support ring 502 pulls the secondary pressing plate 505 to move synchronously with the corresponding connecting rod 508. This allows the secondary pressing plate 505 to move synchronously during the movement of the main pressing plate 504, thus adjusting the space between the main pressing plate 504 and the secondary pressing plate 505.

[0050] A conical nozzle 511 is slidably connected to the right side of the extrusion tube 506. A retaining ring 512 is fixedly sleeved on the outer wall of the extrusion tube 506. A compression spring 513 is fixedly connected between the side wall of the retaining ring 512 and the side wall of the conical nozzle 511. A pressure rod 514 is fixedly connected to the inner wall of the conical nozzle 511. A support frame 515 is fixedly connected to the right side of the inner wall of the extrusion tube 506. A conical sealing head 516 is slidably connected to the middle of the support frame 515. The right side of the conical sealing head 516 overlaps with the right side of the inner wall of the extrusion tube 506. A short spring 517 is movably connected between the left side of the conical sealing head 516 and the right side of the support frame 515. It should be noted that the right side of the inner wall of the extrusion tube 506 is tapered. When the short spring 517 presses against the tapered sealing head 516 and fits against the right side of the inner wall of the extrusion tube 506, it can seal the position of the extrusion tube 506. The left end of the tapered sealing head 516 is fixedly connected to a plug rod, and the tapered sealing head 516 is slidably connected to the inside of the support frame 515 through the plug rod.

[0051] In this embodiment, as Figures 1 to 10 As shown, a crossbar is fixedly connected to the middle of the pressure plate 505. A hinge block is fixedly connected to the middle of both the crossbar and the middle of the main pressure plate 504. The opposite ends of the two connecting rods 508 are respectively hinged to the middle of the corresponding hinge block.

[0052] In this embodiment, as Figures 1 to 10 As shown, a limiting block is symmetrically fixedly connected to the left side of the inner wall of the material storage cylinder 3, and the left side of the main pressing plate 504 overlaps with the side wall of the limiting block.

[0053] A perforation is provided on the right side of the material storage cylinder 3, and the extrusion tube 506 is movably inserted inside the perforation. It should be noted that a sealing ring that mates with the outer wall of the extrusion tube 506 is fixedly connected to the inner wall of the perforation.

[0054] In this embodiment, as Figures 1 to 10 As shown, the mold switching mechanism 7 includes a motor 701, which is fixedly connected to the right side of the top of the support base 1. An adjusting rod 702 is fixedly connected to the rotating end of the motor 701. A convex limiting plate 703 is fixedly connected to the top of the adjusting rod 702. An adjusting pin 704 is rotatably connected to the top of the convex limiting plate 703.

[0055] A support plate 705 is rotatably connected to the middle of the outer wall of the support tube 6. A linkage plate 706 is fixedly connected to the bottom of the support plate 705. The linkage plate 706 has pin grooves 707 around its perimeter that mate with the adjusting pin 704. The side wall of the linkage plate 706 overlaps with the upper side wall of the convex limiting plate 703. It should be noted that the adjusting pin 704 is eccentrically positioned at the top of the convex limiting plate 703. During its circumferential rotation, the adjusting pin 704 can insert into the pin grooves 707 on the side wall of the linkage plate 706. When the adjusting pin 704 rotates one revolution, it engages with the pin grooves 707, causing the linkage plate 706 to rotate 90 degrees.

[0056] A pad 708 is fixedly connected to the top of the support base 1. A main guide sleeve 709 is movably connected to the upper part of the pad 708. The middle part of the main guide sleeve 709 is movably sleeved on the lower part of the support tube 6. A toothed plate 710 is fixedly connected to the right side of the main guide sleeve 709. A semi-toothed ring 711 that mates with the toothed plate 710 is fixedly sleeved on the lower part of the adjusting rod 702. It should be noted that the adjusting pin 704 and the semi-toothed ring 711 are set in a staggered manner. When the convex limiting plate 703 rotates clockwise with the adjusting pin 704 and disengages from the corresponding pin groove 707, the semi-toothed ring 711 on the adjusting rod 702 will engage with the toothed plate 710 during clockwise rotation, causing the toothed plate 710 to move to the right with the main guide sleeve 709.

[0057] A transmission rod 712 is vertically slidably connected inside the support tube 6. Guide shafts 713 are fixedly connected to both the upper and lower parts of the transmission rod 712. Guide grooves 714 are symmetrically formed on both the front and rear sides of the support tube 6. The two ends of the upper guide shaft 713 of the transmission rod 712 correspond one-to-one with the two upper guide grooves 714 of the support tube 6, and the two ends of the lower guide shaft 713 of the transmission rod 712 correspond one-to-one with the two lower guide grooves 714 of the support tube 6. The ends of the guide shafts 713 are slidably connected inside the corresponding guide grooves 714. A limit ring 715 is fixedly connected to the middle of the transmission rod 712. A pressing spring 716 is fixedly connected between the top of the limit ring 715 and the inner wall of the support tube 6. It should be noted that the inner wall of the support tube 6 has a protrusion that cooperates with the limit ring 715, and the top of the pressing spring 716 is fixedly connected to the bottom of the protrusion.

[0058] The upper part of the support tube 6 is movably sleeved with a spiral guide sleeve 717. The front and rear sides of the spiral guide sleeve 717 and the front and rear sides of the main spiral guide sleeve 709 are provided with inclined grooves 718. The two ends of the upper guide shaft 713 of the transmission rod 712 correspond one-to-one with the two inclined grooves 718 on the spiral guide sleeve 717. The two ends of the lower guide shaft 713 of the transmission rod 712 correspond one-to-one with the two inclined grooves 718 on the main spiral guide sleeve 709. One end of the guide shaft 713 extends through the guide groove 714 into the interior of the corresponding inclined groove 718. A T-shaped pressure plate 719 is fixedly connected to the left side of the spiral guide sleeve 717. It should be noted that: a movable block is fixedly connected to the upper part of the support tube 6, and a movable groove is opened from the bottom of the loop guide sleeve 717. The movable block and the movable groove cooperate to ensure that the loop guide sleeve 717 can move stably on the upper part of the support tube 6; the inclined groove on the main loop guide sleeve 709 and the loop guide sleeve 717 are set in opposite directions. When the toothed plate 710 disengages from the half toothed ring 711, the pressing spring 716 presses the transmission rod 712 down, causing the guide shaft 713 on the transmission rod 712 to move down along the guide groove 714. During the sliding process of the guide shaft 713 and the inclined groove 718 on the main loop guide sleeve 709, the main loop guide sleeve 709 moves to the left to reset, while the loop guide sleeve 717 moves to the right to reset on the surface of the support tube 6.

[0059] The top of the support plate 705 is equidistantly connected with four lower molds 720. The top of the lower molds 720 is movably connected with an upper mold 721 that cooperates with the T-shaped pressure plate 719. The side wall of the upper mold 721 is fixedly connected with a positioning sleeve 722 that cooperates with the extrusion adjustment mechanism 5. It should be noted that: the top of the support plate 705 is provided with four grooves at equal intervals along the circumference, and the bottom of the lower mold 720 is slidably connected to the inside of the corresponding groove; when the lower mold 720 and the upper mold 721 on the right side of the support base 1 are pressed by the T-shaped pressure plate 719, the lower mold 720 and the upper mold 721 move to the left, so that the positioning sleeve 722 on the side wall of the upper mold 721 is fitted into the position of the conical nozzle 511, and presses the conical nozzle 511 to move to the left; since the distance that the lower mold 720 and the upper mold 721 move to the left is fixed, when the position of the pressure plate 505 and the extrusion tube 506 inside the accumulator 3 is adjusted, the positioning sleeve 722 on the side wall of the upper mold 721 can always press against the position of the conical nozzle 511 on the right side of the extrusion tube 506, and move the extrusion tube 506 into the accumulator 3 to the limit position to complete the injection molding operation.

[0060] Four positioning blocks 723 are fixedly connected at equal intervals along the circumference of the top of the support plate 705. Each of the four positioning blocks 723 corresponds to one of the four lower molds 720. A return spring 724 is fixedly connected between the side wall of each positioning block 723 and the side wall of the adjacent lower mold 720. It should be noted that a positioning rod is fixedly connected to the side wall of each lower mold 720. The lower mold 720 is slidably connected to the positioning block 723 via the positioning rod, and the return spring 724 is movably sleeved on the surface of the positioning rod.

[0061] An adjusting plate 725 is rotatably connected to the upper part of the support tube 6. Four rectangular grooves 726 are equidistantly opened on the surface of the adjusting plate 725 along the circumference. A rectangular block 727 is slidably connected inside the rectangular groove 726. A pull rod 728 is movably inserted in the middle of the rectangular block 727. The four pull rods 728 correspond one-to-one with the four upper molds 721. The bottom of the pull rod 728 is fixedly connected to the top of the corresponding upper mold 721. A guide roller 729 is fixedly connected to the upper part of the pull rod 728. A main trapezoidal guide plate 730 that cooperates with the guide roller 729 is fixedly connected to the right side of the top of the support tube 6. A secondary trapezoidal guide plate 731 that cooperates with the guide roller 729 is fixedly connected to the left side of the top of the support tube 6. It should be noted that the main trapezoidal guide plate 730 is set in the opposite direction to the secondary trapezoidal guide plate 731. When the support plate 705, lower mold 720, upper mold 721, and corresponding guide roller 729 rotate to the position of the main trapezoidal guide plate 730 on the right side of the support tube 6, the guide roller 729 moves along the trajectory of the main trapezoidal guide plate 730 and moves the pull rod 728 upward, causing the pull rod 728 to lift the corresponding upper mold 721 to perform the mold opening operation. At this time, the injection-molded bottle cap is then lifted from the mold by a mechanical suction cup. The lower mold 720 is sucked out. The mechanical suction cup here can be the limit hand of the existing technology, which will not be described in detail. When the support plate 705, the lower mold 720, the upper mold 721 and the corresponding guide roller 729 rotate to the position of the trapezoidal guide plate 731 on the left side of the support tube 6, the guide roller 729 moves along the trajectory of the trapezoidal guide plate 731 and moves down with the pull rod 728, so that the pressure rod 514 presses the upper mold 721 down and moves down to stably fit against the top position of the lower mold 720 for injection molding.

[0062] In this embodiment, as Figures 1 to 10 As shown, the linkage plate 706 has curved surfaces on all four sides, and the curved surfaces of the side walls of the linkage plate 706 overlap with the curved surfaces of the upper part of the convex limiting plate 703. It should be noted that the curved surfaces of the side walls of the linkage plate 706 are concave, and the curved surfaces of the side walls of the convex limiting plate 703 are convex. Through the cooperation of the concave and convex surfaces, when the adjusting pin 704 does not cooperate with the pin groove 707 on the linkage plate 706, and the convex limiting plate 703 is rotated clockwise by the motor 701, the linkage plate 706 will not rotate, thus having a certain self-locking effect.

[0063] Both the linkage plate 706 and the support plate 705 have through holes in the middle that cooperate with the support tube 6, and a support bearing is fixedly connected between the inner wall of the through hole and the surface of the support tube 6.

[0064] In this embodiment, as Figures 1 to 10As shown, a T-shaped slide rod is fixedly connected to the left side of the main guide sleeve 709. The T-shaped slide rod is movably inserted through the upper part of the pad 708. A return spring is movably connected between the left side of the pad 708 and the left end of the T-shaped slide rod. It should be noted that a support rod is fixedly connected to the right side of the main guide sleeve 709, and a support block is fixedly connected to the top of the support base 1. The support rod is movably inserted inside the support block. The stability of the main guide sleeve 709 during the translation process of the support tube 6 is improved through the cooperation of the pad 708 and the support block.

[0065] In this embodiment, as Figures 1 to 10 As shown, a method for using a transparent plastic cup lid injection molding machine includes the following steps:

[0066] S1. When using this plastic cup lid injection molding machine, the injection molding material is first conveyed into the accumulator cylinder 3 through the screw injection molding machine body 2. During the material replenishment process, the main pressure plate 504 on the left side of the inner wall of the accumulator cylinder 3 moves to the left to its limit position, while the conical sealing head 516 inside the extrusion tube 506 seals the right end of the extrusion tube 506, causing the pressure plate 505 to move the extrusion tube 506 to the right to its limit position. At this time, the material inside the accumulator cylinder 3 is full of material. At the same time, the motor 701 is started, driving the adjusting rod. 702 rotates clockwise, causing the adjusting rod 702 to rotate along with the convex limiting plate 703 and the adjusting pin 704. When the adjusting pin 704 rotates along the circular trajectory to the pin groove 707 opened on the side wall of the linkage plate 706, the adjusting pin 704 inserts into the corresponding pin groove 707 and rotates synchronously with the linkage plate 706 and the support plate 705 on the surface of the support tube 6. After the adjusting pin 704 rotates one revolution, the linkage plate 706 rotates ninety degrees with the support plate 705, switching the positions of the four lower molds 720 on the top of the support plate 705.

[0067] S2. After the support plate 705 rotates the lower mold 720 ninety degrees, one of the lower molds 720 and the corresponding upper mold 721 rotate to the right end position of the conical nozzle 511. Meanwhile, the continuously rotating adjusting rod 702, along with the half-tooth ring 711, engages with the toothed plate 710 on the main guide sleeve 709, causing the toothed plate 710 to move the main guide sleeve 709 to the right. The inclined groove 718 on the main guide sleeve 709 and the guide shaft 71 slidably set on the support tube 6... 3. During the sliding process, the guide shaft 713 carries the transmission rod 712 upward inside the support tube 6. At this time, the guide shaft 713 on the upper part of the transmission rod 712 slides with the inclined groove 718 on the guide sleeve 717, causing the guide sleeve 717 to move from right to left, carrying the T-shaped pressure plate 719 to press the corresponding lower mold 720 and upper mold 721 towards the conical nozzle 511. Then, the positioning sleeve 722 on the side wall of the upper mold 721 is fitted onto the conical nozzle 511. The position causes the conical nozzle 511 to be pressed against the surface of the extrusion tube 506 and move to the left. At this time, the pressure rod 514 inside the conical nozzle 511 presses against the conical sealing head 516 to release the seal on the right end of the extrusion tube 506. As the lower die 720 continues to move to the left, the extrusion tube 506 moves from the pressure plate 505 towards the main pressure plate 504. With the cooperation of the connecting rod 508, the support rod 501 and the support ring 502, the two connecting rods 508 are positioned opposite each other. The main pressure plate 504 and the secondary pressure plate 505 are moved relative to each other. Under the action of the one-way valve 4, the raw material inside the accumulator 3 will not enter the screw injection molding machine body 2. The raw material between the main pressure plate 504 and the secondary pressure plate 505 is quantitatively injected into the upper mold 721 and the lower mold 720 from the position of the extrusion tube 506 and the conical nozzle 511. The quantitative injection of raw material is determined according to the distance between the main pressure plate 504 and the secondary pressure plate 505.

[0068] S3. After the upper die 721 and lower die 720 on the left side of the support plate 705 have finished feeding, the continuously rotating semi-toothed ring 711 disengages from the toothed plate 710 on the side wall of the main guide sleeve 709. Under the elastic recovery of the pressing spring 716, the main guide sleeve 709, the transmission rod 712, and the guide sleeve 717, along with the T-shaped pressure plate 719, return to their original positions. At the same time, the return spring 724, along with the corresponding lower die 720 and upper die 721, returns to their original positions and disengages from the conical nozzle 511. At this time, the short spring 517 inside the extrusion tube 506, along with the conical sealing head 516,... The resetting seals the position of the extrusion tube 506, promptly releasing the injection state. Then, the one-way valve 4 opens, and the raw material inside the screw injection molding machine body 2 flows back into the space between the main pressure plate 504 and the secondary pressure plate 505 for replenishment. By rotating the adjusting screw 509, the pressing plate 510 is pushed against the main pressure plate 504 to move. At this time, with the cooperation of the connecting rod 508 and the support ring 502, the main pressure plate 504 and the secondary pressure plate 505 move relative to each other or away from each other, adjusting the space between the main pressure plate 504 and the secondary pressure plate 505, and controlling the amount of material to be fed next time.

[0069] S4. Since the support plate 705 will rotate the lower mold 720 and upper mold 721 at the top in stages by 90 degrees, when the lower mold 720 and upper mold 721 after injection are rotated to the right side of the support tube 6, the pull rod 728 and guide roller 729 at the top of the upper mold 721 rotate to the position of the main trapezoidal guide plate 730 on the right side of the top of the support tube 6. The guide roller 729 slides along the trajectory of the main trapezoidal guide plate 730 and carries the pull rod 728 up, so that the pull rod 728 carries the upper mold 721 to move up for mold opening and unloading. The four continuously rotating lower molds 720 and four upper molds 721 are combined and sequentially cooperate with the conical nozzle 511 for injection, avoiding mold opening and unloading operations at the injection position.

[0070] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A transparent plastic cup lid injection molding machine, comprising a support base (1), characterized in that: The upper left side of the support base (1) is fixedly connected to the screw injection molding machine body (2), the right end of the screw injection molding machine body (2) is fixedly connected to the accumulator cylinder (3), the top of the accumulator cylinder (3) is fixedly connected to the screw injection molding machine body (2), and the inside of the accumulator cylinder (3) is movably connected to the extrusion adjustment mechanism (5). A support tube (6) is vertically fixed to the right side of the support base (1), and a mold switching mechanism (7) that cooperates with the extrusion adjustment mechanism (5) is movably connected between the upper part of the support tube (6) and the top of the support base (1). The extrusion adjustment mechanism (5) includes a support rod (501), which is fixedly connected to the inner bottom surface of the storage cylinder (3). A support ring (502) is rotatably connected to the upper part of the support rod (501), and U-shaped hinge plates (503) are fixedly connected to both sides of the support ring (502). A main pressure plate (504) is slidably connected to the left side of the inner wall of the storage cylinder (3), and a secondary pressure plate (505) is slidably connected to the right side of the inner wall of the storage cylinder (3). An extrusion tube (506) is fixedly connected to the right side of the secondary pressure plate (505). The middle part of the extrusion tube (506) is movably inserted through the right side of the storage cylinder (3). A round hole (507) that matches the extrusion tube (506) is opened in the middle of the secondary pressure plate (505). A connecting rod (508) is movably connected to the side opposite to the main pressure plate (504) of the secondary pressure plate (505). The two connecting rods (508) correspond one-to-one with the two U-shaped hinge plates (503). One end of the two connecting rods (508) is respectively hinged inside the two U-shaped hinge plates (503). The left side of the storage cylinder (3) is threaded with an adjusting screw (509), and the right end of the adjusting screw (509) is fixedly connected with a pressing plate (510). The side wall of the pressing plate (510) overlaps with the left side of the main pressing plate (504). A conical nozzle (511) is slidably connected to the right side of the extrusion tube (506). A retaining ring (512) is fixedly sleeved on the outer wall of the extrusion tube (506). A compression spring (513) is fixedly connected between the side wall of the retaining ring (512) and the side wall of the conical nozzle (511). A pressure rod (514) is fixedly connected to the inner wall of the conical nozzle (511). A support frame (515) is fixedly connected to the right side of the inner wall of the extrusion tube (506). A conical sealing head (516) is slidably connected to the middle of the support frame (515). The right side of the conical sealing head (516) overlaps with the right side of the inner wall of the extrusion tube (506). A short spring (517) is movably connected between the left side of the conical sealing head (516) and the right side of the support frame (515).

2. The transparent plastic cup lid injection molding machine according to claim 1, characterized in that: A crossbar is fixedly connected to the middle of the pressure plate (505), and a hinge block is fixedly connected to the middle of both the crossbar and the middle of the main pressure plate (504). The opposite ends of the two connecting rods (508) are respectively hinged to the middle of the corresponding hinge block.

3. The transparent plastic cup lid injection molding machine according to claim 2, characterized in that: A limiting block is symmetrically fixedly connected to the left side of the inner wall of the storage cylinder (3), and the left side of the main pressing plate (504) overlaps with the side wall of the limiting block. The storage cylinder (3) has a perforation on its right side, and the extrusion tube (506) is movably inserted inside the perforation.

4. The transparent plastic cup lid injection molding machine according to claim 3, characterized in that: The mold switching mechanism (7) includes a motor (701), which is fixedly connected to the right side of the top of the support base (1). An adjusting rod (702) is fixedly connected to the rotating end of the motor (701). A convex limiting plate (703) is fixedly connected to the top of the adjusting rod (702). An adjusting pin (704) is rotatably connected to the top of the convex limiting plate (703). A support plate (705) is rotatably connected to the middle of the outer wall of the support tube (6). A linkage plate (706) is fixedly connected to the bottom of the support plate (705). Pin grooves (707) that cooperate with the adjusting pin (704) are provided around the linkage plate (706). The side wall of the linkage plate (706) overlaps with the side wall of the upper part of the convex limiting plate (703). A pad (708) is fixedly connected to the top of the support base (1). A main guide sleeve (709) is movably connected to the upper part of the pad (708). The middle part of the main guide sleeve (709) is movably sleeved on the lower part of the support tube (6). A toothed plate (710) is fixedly connected to the right side of the main guide sleeve (709). A semi-toothed ring (711) that cooperates with the toothed plate (710) is fixedly sleeved on the lower part of the adjusting rod (702). The support tube (6) is vertically slidably connected to a transmission rod (712). The upper and lower parts of the transmission rod (712) are fixedly connected to guide shafts (713). The front and rear sides of the support tube (6) are symmetrically provided with guide grooves (714). The two ends of the upper guide shaft (713) of the transmission rod (712) correspond one-to-one with the two guide grooves (714) of the upper part of the support tube (6). The two ends of the lower guide shaft (713) of the transmission rod (712) correspond one-to-one with the two guide grooves (714) of the lower part of the support tube (6). The end of the guide shaft (713) is slidably connected to the interior of the corresponding guide groove (714). The middle part of the transmission rod (712) is fixedly connected to a limit ring (715). The top of the limit ring (715) is fixedly connected to the inner wall of the support tube (6) with a pressing spring (716). The upper part of the support tube (6) is movably sleeved with a spiral guide sleeve (717). The front and rear sides of the spiral guide sleeve (717) and the front and rear sides of the main spiral guide sleeve (709) are provided with inclined grooves (718). The two ends of the upper guide shaft (713) of the transmission rod (712) correspond one-to-one with the two inclined grooves (718) on the spiral guide sleeve (717). The two ends of the lower guide shaft (713) of the transmission rod (712) correspond one-to-one with the two inclined grooves (718) on the main spiral guide sleeve (709). One end of the guide shaft (713) extends through the guide groove (714) to the interior of the corresponding inclined groove (718). A T-shaped pressure plate (719) is fixedly connected to the left side of the spiral guide sleeve (717). The top of the support plate (705) is equidistantly connected with four lower molds (720) along the circumference. The top of the lower molds (720) is movably connected with an upper mold (721) that cooperates with the T-shaped pressure plate (719). The side wall of the upper mold (721) is fixedly connected with a positioning sleeve (722) that cooperates with the extrusion adjustment mechanism (5). The top of the support plate (705) is fixedly connected with four positioning blocks (723) at equal intervals along the circumference. The four positioning blocks (723) correspond one-to-one with the four lower molds (720). A return spring (724) is fixedly connected between the side wall of the positioning block (723) and the side wall of the adjacent lower mold (720). An adjusting plate (725) is rotatably connected to the upper part of the support tube (6). Four rectangular grooves (726) are equidistantly opened on the surface of the adjusting plate (725) along the circumference. A rectangular block (727) is slidably connected inside the rectangular groove (726). A pull rod (728) is movably inserted in the middle of the rectangular block (727). The four pull rods (728) correspond one-to-one with the four upper molds (721). The bottom of the pull rod (728) is fixedly connected to the top of the corresponding upper mold (721). A guide roller (729) is fixedly connected to the upper part of the pull rod (728). A main trapezoidal guide plate (730) that cooperates with the guide roller (729) is fixedly connected to the right side of the top of the support tube (6). A secondary trapezoidal guide plate (731) that cooperates with the guide roller (729) is fixedly connected to the left side of the top of the support tube (6).

5. The transparent plastic cup lid injection molding machine according to claim 4, characterized in that: The linkage plate (706) is provided with arc-shaped surfaces on all four sides, and the arc-shaped surface of the side wall of the linkage plate (706) overlaps with the arc-shaped surface of the upper part of the convex limiting plate (703). Both the linkage plate (706) and the support plate (705) have through holes in the middle that cooperate with the support tube (6), and a support bearing is fixedly connected between the inner wall of the through hole and the surface of the support tube (6).

6. The transparent plastic cup lid injection molding machine according to claim 5, characterized in that: A T-shaped slide rod is fixedly connected to the left side of the main guide sleeve (709). The T-shaped slide rod is movably inserted through the upper part of the pad (708). A return spring is movably connected between the left side of the pad (708) and the left end of the T-shaped slide rod.

7. The operating method of the transparent plastic cup lid injection molding machine according to claim 6 includes the following steps: S1. When using this plastic cup lid injection molding machine, firstly, the injection molding material is conveyed into the accumulator cylinder (3) through the screw injection molding machine body (2). During the replenishment of the injection molding material, the main pressure plate (504) pressing against the left side of the inner wall of the accumulator cylinder (3) moves to the left limit position, while the conical sealing head (516) inside the extrusion tube (506) seals the right end of the extrusion tube (506), causing the pressure plate (505) to move to the right limit position along with the extrusion tube (506). At this time, the material inside the accumulator cylinder (3) is in a full state. At the same time, the motor (701) is started, and the adjusting rod (702) is moved smoothly. The clockwise rotation causes the adjusting rod (702) to rotate along with the convex limiting plate (703) and the adjusting pin (704). When the adjusting pin (704) rotates along the circular trajectory to the pin groove (707) on the side wall of the linkage plate (706), the adjusting pin (704) is inserted into the corresponding pin groove (707) and rotates synchronously with the linkage plate (706) and the support plate (705) on the surface of the support tube (6). After the adjusting pin (704) rotates once, the linkage plate (706) rotates ninety degrees with the support plate (705) to switch the positions of the four lower molds (720) on the top of the support plate (705). S2. After the support plate (705) rotates the lower mold (720) ninety degrees, one of the lower molds (720) and the corresponding upper mold (721) rotate to the right end position of the conical nozzle (511), while the continuously rotating adjusting rod (702) engages with the toothed plate (710) on the main guide sleeve (709) with the half toothed ring (711), causing the toothed plate (710) to move to the right with the main guide sleeve (709). The inclined groove (718) on the main guide sleeve (709) and the guide shaft (710) slidably set on the support tube (6) are connected. 13) During the sliding process, the guide shaft (713) carries the transmission rod (712) upward inside the support tube (6). At this time, the guide shaft (713) on the upper part of the transmission rod (712) slides with the inclined groove (718) on the guide sleeve (717), so that the guide sleeve (717) carries the T-shaped pressure plate (719) from right to left to press the corresponding lower mold (720) and upper mold (721) towards the conical nozzle (511). Then, the positioning sleeve (722) on the side wall of the upper mold (721) is fitted onto the conical nozzle (511). Position 11) causes the conical nozzle (511) to be pressed against the surface of the extrusion tube (506) and move to the left. At this time, the pressure rod (514) inside the conical nozzle (511) presses against the conical sealing head (516) to release the seal on the right end of the extrusion tube (506). As the lower die (720) continues to move to the left, the extrusion tube (506) moves from the pressure plate (505) towards the main pressure plate (504). With the cooperation of the connecting rod (508), the support rod (501) and the support ring (502), the two connecting rods (508) move relative to each other. One end is moved in a staggered manner, so that the main pressure plate (504) and the secondary pressure plate (505) are in a relative moving state. Under the action of the one-way valve (4), the raw material inside the accumulator (3) will not enter the screw injection molding machine body (2), so that the raw material between the main pressure plate (504) and the secondary pressure plate (505) enters the upper mold (721) and the lower mold (720) from the position of the extrusion tube (506) and the conical nozzle (511). The raw material for this quantitative injection is determined according to the distance between the main pressure plate (504) and the secondary pressure plate (505). S3. After the upper die (721) and lower die (720) on the left side of the support plate (705) have finished feeding, the rotating half-tooth ring (711) disengages from the toothed plate (710) on the side wall of the main guide sleeve (709). Under the elastic recovery of the pressing spring (716), the main guide sleeve (709), the transmission rod (712), and the T-shaped pressure plate (719) carried by the guide sleeve (717) return to their original positions. At the same time, the return spring (724) carries the corresponding lower die (720) and upper die (721) to return to their original positions and disengage from the conical nozzle (511). At this time, the short spring (517) inside the extrusion tube (506) carries the conical nozzle... The sealing head (516) is reset to seal the position of the extrusion tube (506). Then the one-way valve (4) is opened, and the raw material inside the screw injection molding machine body (2) flows back into the space between the main pressure plate (504) and the slave pressure plate (505) to replenish it. By rotating the adjusting screw (509), the pressing plate (510) is pushed against the main pressure plate (504) to move. At this time, with the cooperation of the connecting rod (508) and the support ring (502), the main pressure plate (504) and the slave pressure plate (505) move relative to each other or away from each other to adjust the space between the main pressure plate (504) and the slave pressure plate (505) and control the amount of material to be fed next time. S4. Since the support plate (705) will rotate the lower mold (720) and upper mold (721) at the top in stages by 90 degrees, when the lower mold (720) and upper mold (721) after injection are rotated to the right side of the support tube (6), the pull rod (728) and guide roller (729) at the top of the upper mold (721) rotate to the position of the main trapezoidal guide plate (730) on the right side of the top of the support tube (6). The guide roller (729) slides along the trajectory of the main trapezoidal guide plate (730) and carries the pull rod (728) up, so that the pull rod (728) carries the upper mold (721) to move up for mold opening and unloading. The four continuously rotating lower molds (720) and four upper molds (721) are combined and sequentially cooperate with the conical nozzle (511) for injection, avoiding mold opening and unloading operations at the injection position.

Images