Injection molding machine mold opening device and injection molding machine containing the same

Abstract

The present invention relates to the technical field of injection molding machines, and specifically discloses an injection molding machine mold opening device and an injection molding machine containing the device, comprising a support platform, a protective cover fixedly connected to the top of the support platform, a mold opening and closing assembly arranged inside the protective cover, the mold opening and closing assembly comprising a mold opening and closing mechanism and a blanking mechanism arranged in the protective cover, the mold opening and closing mechanism comprising a movable mold plate and a fixed mold plate; during injection molding, the movable mold plate slides in the guide seat along the guide rod, pushing the side molds on both sides to move toward each other and complete docking, then the movable mold plate continues to move, driving the side molds and the fixed mold plate to cooperate to form a complete mold cavity to meet the injection molding requirements of hollow products, after the product is formed, the movable mold plate and the side mold are reset synchronously, when the side molds are separated, the support plate drives the clamping mechanism to move to the bottom of the side mold, after the side molds are completely separated, the product falls on the side mold and slides naturally as it moves, thereby more conveniently realizing mold opening and blanking, reducing the risk of product collision, and ensuring blanking quality.

Description

Technical Field

[0001] The present invention relates to the technical field of injection molding machines, in particular to an injection molding machine mold opening device and an injection molding machine containing the device. Background Art

[0002] As the core equipment for plastic molding, the injection molding machine can transform thermoplastic or thermosetting plastics into various plastic products through plastic molding molds. During the injection molding process, the screw pushes the plasticized molten plastic into the closed mold cavity. After the plastic solidifies and takes shape in the mold cavity, the injection molding machine drive mechanism drives the movable template to move relative to the fixed template to open the mold. When the mold opens to the predetermined position, the ejection mechanism ejects the molded product from the mold cavity.

[0003] In the production process of injection-molded hollow products, the ejector structure and the robot arm are often linked to complete the product demolding operation. However, in the traditional collaborative operation mode, the timing of the ejection and robot movements is difficult to synchronize accurately. Once the timing of ejection and grasping is not properly coordinated, the product is very likely to fall or collide during the transfer process, which will not only damage the appearance of the product and reduce the yield rate, but also cause the injection molding machine to be unable to enter the next production cycle in time due to the slow removal speed, seriously restricting the injection molding work efficiency.

[0004] Therefore, it is necessary to provide a mold opening device for an injection molding machine and an injection molding machine containing the device, in order to solve the above problems. Summary of the Invention

[0005] The main purpose of the present invention is to provide a mold opening device for an injection molding machine and an injection molding machine containing the device, which can effectively solve the problems in the background technology.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] A mold opening device for an injection molding machine comprises a support platform, a protective cover fixedly connected to the top of the support platform, a mold opening and closing assembly arranged inside the protective cover, and the mold opening and closing assembly comprising a mold opening and closing mechanism and a material discharge mechanism arranged inside the protective cover;

[0008] The mold opening and closing mechanism includes a movable mold plate and a fixed mold plate, the movable mold plate is fixedly connected to the top of the support platform, the fixed mold plate is slidably connected to the top of the support platform via a slide rail, side molds are symmetrically arranged between the movable mold plate and the fixed mold plate, the side of the side molds away from each other is fixedly connected to a guide seat, the movable mold plate and the fixed mold plate are respectively fixedly connected to two guide bars on opposite sides thereof, the guide bars are both slidably connected to the inside of the guide seat, a guide rod is symmetrically fixed to one end of the guide bar located in the guide seat, and the guide rod is slidably connected to the inside of the guide seat;

[0009] The blanking mechanism includes a support plate and a dual-axis motor. The support platform is symmetrically and slidingly connected to a slider inside. The output shafts of the dual-axis motor are respectively fixedly connected to screw rods through couplings. A spiral pair transmission is formed between the screw rods and the sliders. The support plate is symmetrically and rotationally connected to a connecting seat inside. The side mold is slidably connected to the inside of the support platform. A push rod is rotationally connected between the slider and the connecting seat. The support plate is symmetrically and fixedly connected to a clamping mechanism inside.

[0010] As a further improvement of the above-mentioned solution, a hydraulic rod 1 is fixedly installed inside the protective cover, a safety door is slidably connected to the outside of the protective cover, the movable end of the hydraulic rod 1 is fixedly connected to the movable template, four limit rods are fixedly connected between the fixed template and the inner wall of the protective cover, and the movable template is slidably connected to the four limit rods.

[0011] As a further improvement of the above solution, the tops of the movable template and the fixed template are respectively slidably connected with sliding rods, the tops of the two side templates are slidably connected with top plates, and the sliding rods are fixedly connected to the top plates.

[0012] As a further improvement of the above solution, the top of the support platform is fixedly connected to a support block, the top of the support block is fixedly connected to a wedge block, and a torsion spring is fixedly connected between the top of the connecting seat and the inner wall of the support plate.

[0013] As a further improvement of the above solution, the clamping mechanism includes a mounting seat fixedly connected to the inside of the support plate, the inside of the mounting seat is fixedly connected to a mounting shaft, the outside of the mounting shaft is rotatably connected to a clamping block, and a torsion spring 2 is fixedly connected between the mounting shaft and the clamping block.

[0014] Another purpose of an embodiment of the present invention is to provide an injection molding machine, including a bracket and an injection molding component, wherein the bracket is fixedly connected to the top of the support platform, and the injection molding component includes a discharge barrel and a feed barrel, wherein the discharge barrel is fixedly installed on the top of the bracket, and the feed barrel is fixedly installed inside the bracket, and the discharge barrel and the feed barrel are fixedly connected, and a screw is rotatably connected inside the feed barrel, and an extrusion mechanism is provided inside the feed barrel.

[0015] As a further improvement of the above scheme, the extrusion mechanism includes a drive rod slidingly connected to the inside of the screw through a spline, and the inside of the bracket is symmetrically fixedly connected with a hydraulic rod 2, and the movable ends of the two hydraulic rods 2 are fixedly connected with a movable seat, and a stepper motor is fixedly installed on the outside of the movable seat. One end of the drive rod located in the bracket is rotatably connected to the movable seat, and the output shaft of the stepper motor is fixedly connected to the drive rod through a coupling.

[0016] As a further improvement of the above solution, a sealing plate is fixedly connected to the outer side of the driving rod, and the sealing plate is slidably connected to the nozzle via a connecting block, and through holes are evenly opened inside the nozzle.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] During injection molding, the movable template slides along the guide rod in the guide seat, pushing the side molds on both sides to move toward each other and complete the docking. Then the movable template continues to move, driving the side molds to cooperate with the fixed template to form a complete mold cavity to meet the injection molding requirements of hollow products. After the product is formed, the movable template and the side mold are reset synchronously. When the side molds are separated, the support plate drives the clamping mechanism to move to the bottom of the side mold. After the side molds are completely separated, the product falls on the side mold and slides naturally as it moves, thereby making it more convenient to open the mold and unload the material, reducing the risk of product collision, and ensuring the unloading quality.

[0019] During the injection molding operation, the movable seat drives the extrusion mechanism, causing the screw to rotate and pushing the hot-melt plastic to accumulate in the gap between the sealing plate and the screw. At this time, the second hydraulic rod is started to drive the movable seat to move horizontally. The movable seat separates the sealing plate from the nozzle through the driving rod, and the hot-melt plastic is injected into the end of the feed barrel near the protective cover through the inner through hole of the nozzle. When the second hydraulic rod drives the movable seat to reset, the sealing plate and the nozzle are fitted together, and the two continue to move, pushing the hot-melt plastic into the mold cavity composed of the movable platen, the fixed platen and the side mold, completing the injection molding filling. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 It is a structural schematic diagram of the mold opening and closing assembly and the injection molding assembly of the present invention;

[0023] Figure 3 Schematic diagram of the top structure of the support platform of the present invention;

[0024] Figure 4 It is a structural schematic diagram of the injection molding component of the present invention;

[0025] Figure 5 It is a structural schematic diagram of the opening and closing mold assembly of the present invention;

[0026] Figure 6 It is a structural schematic diagram of the blanking mechanism of the present invention;

[0027] Figure 7 It is a structural schematic diagram of the support block of the present invention;

[0028] Figure 8 It is a structural schematic diagram of the mounting base of the present invention;

[0029] Figure 9 It is a structural schematic diagram of the movable platen and the fixed platen of the present invention;

[0030] Figure 10 Schematic diagram of the cross-sectional structure of the movable platen and the fixed platen of the present invention;

[0031] Figure 11 Schematic diagram of the internal structure of the guide seat of the present invention.

[0032] In the figure: 1. Support platform; 2. Bracket; 3. Protective cover; 4. Mold opening and closing assembly; 41. Safety door; 42. Mold opening and closing mechanism; 421. Moving mold plate; 422. Fixed mold plate; 423. Side mold; 424. Guide seat; 425. Slide rail; 426. Top plate; 427. Guide bar; 428. Slide rod; 429. Guide rod; 43. Unloading mechanism; 431. Support plate; 432. Connecting seat; 433. Dual-axis motor; 434. Torsion spring 1; 435. Screw rod; 436. Slider ; 437. Push rod; 438. Support block; 439. Wedge block; 44. Hydraulic rod one; 45. Limit rod; 46. Clamping mechanism; 461. Mounting seat; 462. Mounting shaft; 463. Clamping block; 464. Torsion spring two; 5. Injection molding component; 51. Discharge barrel; 52. Feed barrel; 53. Movable seat; 54. Stepper motor; 55. Hydraulic rod two; 56. Screw; 57. Extrusion mechanism; 571. Drive rod; 572. Sealing plate; 573. Connecting block; 574. Nozzle. DETAILED DESCRIPTION

[0033] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0034] See also Figures 1 to 11 As shown, the present invention provides an embodiment:

[0035] A mold opening device for an injection molding machine includes a support platform 1, a protective cover 3 is fixedly connected to the top of the support platform 1, a mold opening and closing assembly 4 is arranged inside the protective cover 3, and the mold opening and closing assembly 4 includes a mold opening and closing mechanism 42 and a material discharge mechanism 43 arranged inside the protective cover 3;

[0036] The mold opening and closing mechanism 42 includes a movable mold plate 421 and a fixed mold plate 422. The fixed mold plate 422 is fixedly connected to the top of the support platform 1. The movable mold plate 421 is slidably connected to the top of the support platform 1 through a slide rail 425. Side molds 423 are symmetrically arranged between the movable mold plate 421 and the fixed mold plate 422. A guide seat 424 is fixedly connected to the side away from the side mold 423. Two guide bars 427 are fixedly connected to the opposite sides of the movable mold plate 421 and the fixed mold plate 422 respectively. The guide bars 427 are all slidably connected to the inside of the guide seat 424. A guide rod 429 is symmetrically fixed to one end of the guide bar 427 located in the guide seat 424. The guide rod 429 is slidably connected to the inside of the guide seat 424.

[0037] The unloading mechanism 43 includes a support plate 431 and a dual-axis motor 433. The support platform 1 is symmetrically and slidingly connected to a slider 436 inside. The output shafts of the dual-axis motor 433 are fixedly connected to screw rods 435 through couplings. A spiral pair transmission is formed between the screw rods 435 and the sliders 436. The support plate 431 is symmetrically and rotationally connected to a connecting seat 432 inside. The side mold 423 is slidingly connected to the inside of the support platform 1. A push rod 437 is rotationally connected between the slider 436 and the connecting seat 432. The support plate 431 is symmetrically and fixedly connected to a clamping mechanism 46 inside.

[0038] In practical application, if Figure 2 、 Figure 3 、 Figure 9 、 Figure 10 and Figure 11 As shown, in the mold closing stage: the movable mold plate 421 moves toward the fixed mold plate 422 along the slide rail 425 on the top of the support platform 1. At this time, the side mold 423 slides along the guide strips 427 on the movable mold plate 421 and the fixed mold plate 422 through the guide seat 424. The guide rod 429 slides in the guide seat 424 to further guide and stabilize the movement of the side mold 423 until the mold is closed and the injection cavity is formed.

[0039] like Figure 2 and Figure 3 As shown, injection molding stage: after the mold is closed, the molten material is injected into the injection cavity, and the material is cooled and solidified to form;

[0040] like Figure 2 、 Figure 3 、 Figure 5 、 Figure 6 and Figure 8As shown, in the mold opening stage: the movable mold plate 421 moves in the opposite direction along the slide rail 425, driving the fixed mold plate 422 to separate from the side mold 423. When the side molds 423 on both sides begin to separate, the dual-axis motor 433 is started, and its output shaft drives the screw rod 435 to rotate. The screw rod 435 and the slider 436 are driven by a spiral pair, so that the slider 436 slides in a predetermined direction inside the support platform 1. The slider 436 pushes the connecting seat 432 through the push rod 437, thereby driving the support plate 431 to move. The clamping mechanism 46 on the support plate 431 approaches and clamps the molded plastic part.

[0041] like Figure 3 and Figure 6 As shown, in the unloading stage: the dual-axis motor 433 runs continuously, and through the spiral pair transmission of the screw rod 435 and the slider 436 and the connection of the push rod 437, the support plate 431 and the plastic part clamped by the clamping mechanism 46 are moved to the unloading position, so that the plastic part is unloaded under the action of gravity.

[0042] like Figure 2 、 Figure 3 、 Figure 5 and Figure 9 As shown, a hydraulic rod 44 is fixedly installed inside the protective cover 3, a safety door 41 is slidably connected to the outside of the protective cover 3, the movable end of the hydraulic rod 44 is fixedly connected to the movable template 421, four limit rods 45 are fixedly connected between the fixed template 422 and the inner wall of the protective cover 3, and the movable template 421 is slidably connected to the four limit rods 45.

[0043] During actual application of this embodiment, before the injection molding machine starts to operate, the safety door 41 is in a closed state to ensure the safety of the operator. After starting the equipment, the hydraulic rod 44 in the protective cover 3 starts to work, and the movable end of the hydraulic rod 44 drives the movable template 421 to move. During the movement of the movable template 421, the fixed template 422 limits and guides the movable template 421 through the limiting rod 45 fixedly connected to the inner wall of the protective cover 3, so that the movable template 421 slides smoothly along the limiting rod 45, thereby realizing the mold closing or mold opening action with the fixed template 422.

[0044] like Figure 10 As shown, the tops of the movable template 421 and the fixed template 422 are slidably connected to slide rods 428 respectively, and the tops of the two side templates 423 are slidably connected to top plates 426 , and the slide rods 428 are fixedly connected to the top plates 426 .

[0045] When the mold is opened, the side mold 423 slides away from the center of the cavity along the slide of the top plate 426. During the whole process, the stable sliding of the slide bar 428 on the movable mold plate 421 and the fixed mold plate 422 provides guidance for the movement of the top plate 426 and the side mold 423, ensuring that the side mold 423 maintains a precise position and movement trajectory during the mold opening and closing process, preventing the side mold 423 from deviating, ensuring the accuracy and stability of the injection mold opening and closing action, and improving the molding quality of the injection molded product.

[0046] like Figure 6 and Figure 7 As shown, the top of the support platform 1 is fixedly connected to a support block 438 , the top of the support block 438 is fixedly connected to a wedge block 439 , and a torsion spring 434 is fixedly connected between the top of the connecting seat 432 and the inner wall of the support plate 431 .

[0047] When this embodiment is actually used, when the connecting seat 432 moves to above the wedge block 439 along with the support plate 431, the inclined surface of the wedge block 439 contacts the connecting seat 432. As the support plate 431 continues to move, the wedge block 439 gradually generates an upward thrust on the connecting seat 432. During this process, the torsion spring 1 434 is stretched or squeezed to store elastic potential energy. At this time, the support plate 431 is tilted to facilitate the unloading of plastic parts, thereby improving the stability and efficiency of unloading and ensuring the continuous and stable operation of the injection molding machine. When the support plate 431 is separated from the wedge block 439, the support plate 431 is reset under the action of the torsion spring 1 434.

[0048] like Figure 8 As shown, the clamping mechanism 46 includes a mounting seat 461 fixedly connected to the inside of the support plate 431, the inside of the mounting seat 461 is fixedly connected to a mounting shaft 462, the outside of the mounting shaft 462 is rotatably connected to a clamping block 463, and a torsion spring 464 is fixedly connected between the mounting shaft 462 and the clamping block 463.

[0049] In actual application of this embodiment, when the support plate 431 approaches the injection-molded plastic part driven by the dual-axis motor 433, the clamping block 463 first contacts the plastic part. As the support plate 431 continues to approach, the plastic part falls between the two clamping blocks 463, ensuring stable clamping of the plastic part. When the support plate 431 moves to the unloading position, the plastic part is unloaded under the action of the wedge block 439, and the torsion spring 464 prevents the support plate 431 from being affected by the movement of the movable plate 421.

[0050] like Figure 2 、 Figure 3 and Figure 4 As shown, the present invention provides another embodiment:

[0051] An injection molding machine includes a bracket 2 and an injection molding assembly 5. The bracket 2 is fixedly connected to the top of the support platform 1. The injection molding assembly 5 includes a lower barrel 51 and a feed barrel 52. The lower barrel 51 is fixedly installed on the top of the bracket 2. The feed barrel 52 is fixedly installed inside the bracket 2. The lower barrel 51 and the feed barrel 52 are fixedly connected. The feed barrel 52 is internally connected to a screw 56 for rotation. An extrusion mechanism 57 is provided inside the feed barrel 52. The extrusion mechanism 57 includes a drive rod 571 that is slidably connected to the inside of the screw 56 through a spline. The inside of the frame 2 is symmetrically fixedly connected with hydraulic rods 55, the movable ends of the two hydraulic rods 55 are fixedly connected with the movable seat 53, and the outside of the movable seat 53 is fixedly installed with a stepper motor 54. The end of the driving rod 571 located in the bracket 2 is rotatably connected to the movable seat 53, and the output shaft of the stepper motor 54 is fixedly connected to the driving rod 571 through a coupling. The outside of the driving rod 571 is fixedly connected with a sealing plate 572, and the sealing plate 572 is slidably connected to the nozzle 574 through a connecting block 573, and the nozzle 574 is evenly provided with through holes.

[0052] In actual application of this embodiment, the material first enters the discharge barrel 51 and naturally falls into the feed barrel 52 fixedly connected thereto by gravity. At the same time, the stepper motor 54 is started, and its output shaft drives the drive rod 571 to rotate through the coupling. Since the drive rod 571 is slidingly connected to the screw 56 through the spline, the screw 56 starts to rotate under the drive rod 571. During the rotation of the screw 56, the material in the feed barrel 52 is pushed from one end close to the discharge barrel 51 to the other end;

[0053] While the feed barrel 52 is conveying and heating the material, the hydraulic rod 2 55 starts to work, and its movable end pushes the movable seat 53 connected to it to move. The movable seat 53 drives the sealing plate 572 to separate from the nozzle 574 through the driving rod 571, so that the hot melt plastic can move through the through hole in the nozzle 574 to the end of the feed barrel 52 close to the protective cover 3. When the hydraulic rod 2 55 drives the movable seat 53 to reset, the sealing plate 572 and the nozzle 574 resume fitting. At this time, the sealing plate 572 and the nozzle 574 that continue to move will push the hot melt plastic into the mold composed of the movable template 421, the fixed template 422 and the side mold 423.

[0054] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or device comprising the element.

[0055] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A mold opening device for an injection molding machine, comprising a support platform (1), wherein a protective cover (3) is fixedly connected to the top of the support platform (1), characterized in that: A mold opening and closing assembly (4) is provided inside the protective cover (3), and the mold opening and closing assembly (4) comprises a mold opening and closing mechanism (42) and a material discharge mechanism (43) provided inside the protective cover (3); The mold opening and closing mechanism (42) includes a movable mold plate (421) and a fixed mold plate (422), wherein the fixed mold plate (422) is fixedly connected to the top of the support platform (1), and the movable mold plate (421) is slidably connected to the top of the support platform (1) via a slide rail (425), and side molds (423) are symmetrically arranged between the movable mold plate (421) and the fixed mold plate (422), and a guide seat (424) is fixedly connected to the side away from the side mold (423), and the movable mold plate (421) and the fixed mold plate (422) are respectively fixedly connected to two guide bars (427) on opposite sides thereof, and the guide bars (427) are both slidably connected to the inside of the guide seat (424), and a guide rod (429) is symmetrically fixed to one end of the guide bar (427) located in the guide seat (424), and the guide rod (429) is slidably connected to the inside of the guide seat (424); The blanking mechanism (43) includes a support plate (431) and a dual-axis motor (433), the support platform (1) is symmetrically slidably connected to a slider (436), the output shafts of the dual-axis motor (433) are respectively fixedly connected to screw rods (435) through couplings, a spiral pair transmission is formed between the screw rods (435) and the sliders (436), the support plate (431) is symmetrically rotationally connected to a connecting seat (432), the side mold (423) is slidably connected to the inside of the support platform (1), a push rod (437) is rotationally connected between the slider (436) and the connecting seat (432), and the support plate (431) is symmetrically fixedly connected to a clamping mechanism (46).

2. The mold opening device for an injection molding machine according to claim 1, characterized in that: A hydraulic rod (44) is fixedly installed inside the protective cover (3), a safety door (41) is slidably connected to the outside of the protective cover (3), a movable end of the hydraulic rod (44) is fixedly connected to a movable plate (421), four limiting rods (45) are fixedly connected between the fixed plate (422) and the inner wall of the protective cover (3), and the movable plate (421) is slidably connected to the four limiting rods (45).

3. The mold opening device for an injection molding machine according to claim 2, characterized in that: The tops of the movable mold plate (421) and the fixed mold plate (422) are respectively slidably connected to slide rods (428), and the tops of the two side molds (423) are slidably connected to top plates (426), and the slide rods (428) are fixedly connected to the top plates (426).

4. The mold opening device for an injection molding machine according to claim 2, characterized in that: The top of the support platform (1) is fixedly connected to a support block (438), the top of the support block (438) is fixedly connected to a wedge block (439), and a torsion spring (434) is fixedly connected between the top of the connecting seat (432) and the inner wall of the support plate (431).

5. The mold opening device for an injection molding machine according to claim 2, characterized in that: The clamping mechanism (46) includes a mounting seat (461) fixedly connected to the inside of the support plate (431), a mounting shaft (462) fixedly connected to the inside of the mounting seat (461), a clamping block (463) rotatably connected to the outside of the mounting shaft (462), and a second torsion spring (464) fixedly connected between the mounting shaft (462) and the clamping block (463).

6. An injection molding machine, comprising a mold opening device for an injection molding machine according to any one of claims 1 to 5, characterized in that: The invention also includes a bracket (2) and an injection molding assembly (5), wherein the bracket (2) is fixedly connected to the top of the support platform (1), and the injection molding assembly (5) includes a discharge barrel (51) and a feed barrel (52), wherein the discharge barrel (51) is fixedly installed on the top of the bracket (2), and the feed barrel (52) is fixedly installed inside the bracket (2), and the discharge barrel (51) and the feed barrel (52) are fixedly connected, and a screw (56) is rotatably connected inside the feed barrel (52), and an extrusion mechanism (57) is provided inside the feed barrel (52).

7. The injection molding machine according to claim 6, characterized in that: The extrusion mechanism (57) includes a driving rod (571) slidingly connected to the inside of the screw (56) through a spline, and the inside of the bracket (2) is symmetrically fixedly connected with a hydraulic rod (55), and the movable ends of the two hydraulic rods (55) are fixedly connected to a movable seat (53), and a stepping motor (54) is fixedly installed on the outside of the movable seat (53). One end of the driving rod (571) is located in the bracket (2) and is rotatably connected to the movable seat (53), and the output shaft of the stepping motor (54) is fixedly connected to the driving rod (571) through a coupling.

8. The injection molding machine according to claim 7, characterized in that: The outer side of the driving rod (571) is fixedly connected to a sealing plate (572), and the sealing plate (572) is slidably connected to a nozzle (574) via a connecting block (573). Through holes are evenly formed inside the nozzle (574).

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