Orthodontic appliance injection molding device

Abstract

The present invention relates to the technical field of orthodontic appliance injection molding, and specifically discloses an orthodontic appliance injection molding device, comprising a machine body, a lifting mechanism, an upper feeding mechanism and a lower feeding mechanism, wherein the upper injection molding mechanism is installed on the lifting mechanism, and the lower injection molding mechanism is installed on the machine body, the upper injection molding mechanism comprises an upper mold and two groups of blocking components slidably connected in the upper mold, an upper mold cavity is provided on the upper mold, and storage grooves are provided at both ends of the upper mold cavity; the orthodontic appliance injection molding device of the present invention adds soft material into the upper mold cavity through the upper feeding mechanism and flows into the lower mold cavity, and adds hard material into the isolation frame through the lower feeding mechanism, so as to add materials of different hardness to different parts of the workpiece, so that the soft and hard materials in the workpiece can be tightly connected together, thereby ensuring the connection strength of the soft and hard materials in the workpiece, and the workpiece after injection molding can also avoid damage or deformation of the molar part of the workpiece.

Description

Technical Field

[0001] The invention relates to the technical field of orthodontic appliance injection molding, and in particular to an orthodontic appliance injection molding device. Background Art

[0002] An appliance is a device for treating malocclusion, and can be called an orthodontic appliance. It can generate force, or the functional force of the masticatory muscles and perioral muscles, to change the deformed jaw, misaligned teeth and periodontal supporting tissues through the appliance, so as to facilitate the normal growth and development of the maxillofacial region. An appliance is usually a mechanical device combined with an elastic metal wire and bracket, or a plastic base, which is worn in the mouth or maxillofacial region. During the production process, the appliance needs to be produced by an injection molding device. During production, a hydraulic cylinder is generally used to drive the upper mold to press on the lower mold, and then the material for producing the appliance is added to the mold through a feeder to form the appliance.

[0003] The Chinese patent document with authorization announcement number CN218053743U discloses a braces molding device for orthodontics. The braces molding device for orthodontics forms a corrective braces in a braces molding groove by extruding a sealing gasket between a first molding mold block and a second molding mold block, and by fixing an injection port at the middle of the front end between the first molding mold block and the second molding mold block, and then inserting a rubber plug into the injection port. The settings of the sealing gasket and the rubber plug can prevent the plastic material in the braces molding groove from overflowing.

[0004] However, the structural design of the above-mentioned related technology: during the injection molding process of the braces, although the yield rate of corrective braces is improved, during the use of the braces, since the material of the braces is relatively soft, and the molars inside the mouth exert greater pressure on the braces than other teeth, it is easy to cause deformation or damage to the parts located at the molars, thereby affecting the service life. If a harder material is uniformly used, it will affect the wearing comfort. The braces processed by secondary injection molding are prone to separation at the connection during long-term use, thereby affecting the service life.

[0005] Therefore, an orthodontic appliance injection molding device is proposed to solve the above-mentioned problems. Summary of the invention

[0006] The invention provides an orthodontic appliance injection molding device, aiming to solve the problem in the related art that the molar part of the orthodontic appliance is easily deformed or damaged by pressure.

[0007] The orthodontic injection molding device of the present invention comprises a machine body, a lifting mechanism, an upper feeding mechanism and a lower feeding mechanism, wherein the upper injection molding mechanism is installed on the lifting mechanism, and the lower injection molding mechanism is installed on the machine body;

[0008] The upper injection molding mechanism includes an upper mold and two groups of blocking components slidably connected to the upper mold. The upper mold is provided with an upper mold cavity, and both ends of the upper mold cavity are provided with a receiving groove 1; the blocking component includes a sealing plate elastically slidably connected to the receiving groove 1 along the length direction of the receiving groove 1;

[0009] The lower injection molding mechanism includes a lower mold and two isolation components located in the lower mold. The lower mold is provided with a lower mold cavity. The inner bottom walls at both ends of the lower mold cavity are provided with receiving grooves 2 for accommodating the isolation components. The isolation components include an isolation frame elastically slidably connected in the receiving grooves 2 along the vertical direction to mold the grinding teeth of the workpiece, and the isolation frame has a wavy edge.

[0010] When the upper mold is pressed on the lower mold, the isolation frame moves up to the lower mold cavity, and the sealing plate enters the upper mold cavity and is located on the top of the isolation frame, isolating the grinding part of the workpiece so that materials with different hardness can be added to different parts of the workpiece.

[0011] The lifting mechanism drives the upper mold to press on the lower mold, and then moves the isolation frame up to the lower mold cavity. At the same time, the sealing plate enters the upper mold cavity and is located on the top of the isolation frame to isolate the grinding part of the workpiece. Then, the soft material is added into the upper mold cavity through the upper feeding mechanism and flows into the lower mold cavity. The hard material is added into the isolation frame through the lower feeding mechanism to add materials of different hardness to different parts of the workpiece.

[0012] Preferably, the blocking assembly further comprises a wedge block 1, on which a fixing plate connected to the sealing plate is mounted, and a sliding groove for the sliding movement of the wedge block 1 is provided inside the upper mold.

[0013] Pushing wedge block 1 can drive the fixed plate to move, and at the same time the fixed plate can drive the sealing plate to enter the upper mold cavity.

[0014] Preferably, a push assembly is installed at the bottom of the lower mold, and four limit assemblies are installed on the inner side of the lower mold close to the isolation frame, and the limit assemblies correspond to wedge block one to squeeze wedge block one.

[0015] Preferably, a plurality of vertical plates are installed at the bottom of the isolation frame, and a connecting strip is installed on each of the plurality of vertical plates.

[0016] Preferably, a connecting rod is provided below the isolation frame, and the plurality of connecting strips are mounted on the connecting rod. A connecting plate is mounted on the bottom end of the connecting rod, and a sliding column is mounted on the connecting plate. The bottom end of the sliding column passes through the lower mold and extends into the ejection assembly.

[0017] When the slide column is pushed upward, the slide column drives the isolation frame to move upward through the connecting strip on the connecting rod, so that the isolation frame can enter the lower mold cavity.

[0018] Preferably, a through slot for the limit assembly to extend out is provided on one side of the interior of the lower mold, and a mounting slot 1 connected to the through slot is also provided on the interior of the lower mold.

[0019] Preferably, the limiting assembly includes a wedge block 2 slidably connected in the through groove, a vertical rod is installed on the wedge block 2, the bottom end of the vertical rod passes through the lower mold and extends into the push assembly, and a mounting ring is installed on the outer side of the vertical rod and is elastically slidably connected in the mounting groove 1 along the vertical direction.

[0020] When the vertical rod is pushed upward, the vertical rod can drive the second wedge to extend out of the through slot and squeeze the first wedge.

[0021] Preferably, the push assembly includes a connecting seat installed on the top of the machine body and a push plate slidably connected to the connecting seat, and a telescopic member 2 for driving the push plate to slide is provided at the bottom of the push plate.

[0022] The push plate can be driven to move upward by the telescopic member 2, and when the push plate moves upward, the sliding column and the vertical rod can be driven to move upward.

[0023] By adopting the above technical scheme, the beneficial effects of the present invention are as follows: the lifting mechanism drives the upper mold to press on the lower mold, and then the isolation frame is moved up to the lower mold cavity, and at the same time the sealing plate enters the upper mold cavity and is located on the top of the isolation frame to isolate the grinding part of the workpiece, and then the soft material is added into the upper mold cavity through the upper feeding mechanism and flows into the lower mold cavity, and the hard material is added into the isolation frame through the lower feeding mechanism to add materials of different hardness to different parts of the workpiece, which can make the soft and hard materials in the workpiece tightly connected together, thereby ensuring the connection strength of the soft and hard materials in the workpiece, and the workpiece after injection molding can also avoid damage or deformation of the grinding part of the workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of a specific embodiment of the present invention.

[0025] Figure 2 It is a structural schematic diagram of a lifting mechanism in a specific embodiment of the present invention.

[0026] Figure 3 It is a schematic diagram of the internal structure of the upper mold in a specific embodiment of the present invention.

[0027] Figure 4 It is a schematic structural diagram of a blocking component in a specific embodiment of the present invention.

[0028] Figure 5 It is a schematic diagram of the internal structure of the lower mold and the connecting seat in a specific embodiment of the present invention.

[0029] Figure 6 It is a schematic structural diagram of an isolation component in a specific embodiment of the present invention.

[0030] Figure 7 It is a schematic structural diagram of a limit stop assembly according to a specific embodiment of the present invention.

[0031] Reference numerals:

[0032] 10. Body;

[0033] 20. Lifting mechanism; 21. Mounting seat; 22. Sliding rod; 23. Connecting block; 24. Mounting column; 25. Telescopic member 1;

[0034] 30. Upper feeding mechanism; 31. Upper feeder; 32. Upper hopper 1;

[0035] 40. Lower feeding mechanism; 41. Lower feeding machine; 42. Upper hopper 2;

[0036] 50, upper injection molding mechanism; 51, upper molding assembly; 511, upper mold; 512, upper mold cavity; 513, upper injection molding hole; 514, storage slot 1; 515, slide slot; 52, blocking assembly; 521, wedge block 1; 522, fixing plate; 523, sealing plate; 524, spring 1;

[0037] 60. Lower injection mechanism; 61. Lower molding assembly; 611. Lower mold; 612. Lower mold cavity; 613. Lower injection hole; 614. Through slot; 615. Mounting slot one; 616. Mounting slot two; 617. Storage slot two; 62. Push assembly; 621. Connecting seat; 622. Push plate; 623. Guide rod; 63. Telescopic member two; 64. Isolation assembly; 641. Isolation frame; 642. Through hole; 643. Vertical plate; 644. Connecting strip; 645. Connecting rod; 646. Connecting plate; 647. Sliding column; 648. Spring two; 65. Limit assembly; 651. Wedge block two; 652. Vertical rod; 653. Mounting ring; 654. Spring three. DETAILED DESCRIPTION

[0038] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0039] like Figures 1 to 7As shown, the orthodontic injection molding device of the present invention comprises a body 10, a lifting mechanism 20, an upper feeding mechanism 30, a lower feeding mechanism 40, an upper injection molding mechanism 50 and a lower injection molding mechanism 60. The lower injection molding mechanism 60 is arranged at the top of the body 10, the upper injection molding mechanism 50 is located above the lower injection molding mechanism 60, the lifting mechanism 20 is arranged at the top of the upper injection molding mechanism 50, the upper feeding mechanism 30 is installed at the top of the lifting mechanism 20 and is connected to the upper injection molding mechanism 50 to inject materials into the upper injection molding mechanism 50, and the lower feeding mechanism 40 is installed at one side of the lower injection molding mechanism 60 to inject materials into the lower injection molding mechanism 60.

[0040] When producing a workpiece, the lifting mechanism 20 drives the upper injection molding mechanism 50 to press on the lower injection molding mechanism 60, and then the upper feeding mechanism 30 and the lower feeding mechanism 40 are used to respectively inject materials into the upper injection molding mechanism 50 and the lower injection molding mechanism 60 to form the workpiece.

[0041] like Figure 1 to Figure 2 As shown, the lifting mechanism 20 includes a mounting seat 21, an upper feeding mechanism 30 is mounted on the top of the mounting seat 21, and an upper injection molding mechanism 50 is mounted on the bottom of the mounting seat 21. Connecting blocks 23 are mounted on both sides of the mounting seat 21, and mounting columns 24 are mounted on the top of the connecting blocks 23. The bottom end of the mounting columns 24 penetrates the connecting blocks 23 and extends to the inside of the machine body 10. A telescopic member 25 is mounted on the bottom end of the mounting columns 24, and the bottom end of the telescopic member 25 is mounted on the inner bottom wall of the machine body 10. Slide rods 22 are slidably connected at the four corners of the top of the mounting seat 21, and the bottom end of the slide rod 22 penetrates the mounting seat 21 and is mounted on the top of the machine body 10.

[0042] The mounting seat 21 can be driven to move up and down by the telescopic member 25. When the mounting seat 21 moves downward, it can drive the upper injection molding mechanism 50 to press on the top of the lower injection molding mechanism 60 to perform injection molding on the workpiece.

[0043] Continue to refer Figure 1 to Figure 2 As shown, the upper feeding mechanism 30 includes an upper feeder 31 mounted on the top of the mounting seat 21, the discharge end of the upper feeder 31 is mounted on the top of the upper injection molding mechanism 50, and an upper hopper 32 is installed on one side of the upper feeder 31.

[0044] Soft materials can be added to the upper feeder 31 through the upper hopper 32 , and the materials entering the upper feeder 31 are transported to the upper injection molding mechanism 50 after being heated.

[0045] Continue to refer Figure 1 to Figure 2 As shown, the lower feeding mechanism 40 includes a lower feeder 41, the bottom of which is mounted on the top of the machine body 10 through a support block, the discharge end of the lower feeder 41 is mounted on one side of the lower injection molding mechanism 60, and an upper hopper 42 is mounted on the top of the lower feeder 41.

[0046] The second upper hopper 42 can be used to add hard material into the lower feeder 41 , and the material entering the lower feeder 41 is transported to the lower injection molding mechanism 60 after being heated.

[0047] like Figures 1 to 3 As shown, the upper injection molding mechanism 50 includes an upper molding assembly 51 disposed on the mounting seat 21 and two groups of blocking assemblies 52 slidably connected to the upper molding assembly 51 , and each group of blocking assemblies 52 has two members.

[0048] like Figures 2 to 3 As shown, the upper molding assembly 51 includes an upper mold 511 mounted on the bottom of the mounting seat 21, an upper mold cavity 512 is provided at the bottom of the upper mold 511, an upper injection hole 513 connected to the upper mold cavity 512 is provided at the top of the upper mold 511, and the feed end of the upper injection hole 513 is connected to the discharge end of the upper feeder 31. Two receiving grooves 1 514 for accommodating the blocking assembly 52 are provided at both ends of the upper mold cavity 512, a slide groove 515 is provided on one side of the upper mold 511 near the receiving groove 1 514, the receiving groove 1 514 is connected to the slide groove 515, and the bottom side of the slide groove 515 is connected to the outside.

[0049] like Figure 3 to Figure 4 As shown, the blocking assembly 52 includes a wedge block 521 and a sealing plate 523. The wedge block 521 is slidably connected to the inside of the slide groove 515, a spring 524 fixed to the inner wall of the slide groove 515 is installed on the top of one side of the wedge block 521, and a fixing plate 522 is installed on the bottom of one side of the wedge block 521, one side of the fixing plate 522 is fixed to one end of the sealing plate 523, and in the initial position, the sealing plate 523 is located in the receiving groove 514.

[0050] When the wedge block 1 521 is squeezed, the spring 1 524 is compressed, and at the same time the wedge block 1 521 drives the sealing plate 523 to enter the upper mold cavity 512 through the fixing plate 522 .

[0051] like Figures 1 to 3 As shown, the lower injection molding mechanism 60 includes a lower molding assembly 61 and two isolation assemblies 64 located in the lower molding assembly 61. A push assembly 62 is installed at the bottom of the lower molding assembly 61, and the push assembly 62 is installed at the top of the machine body 10. Four stopper assemblies 65 are installed on one side of the lower molding assembly 61 near the isolation assembly 64, and the four stopper assemblies 65 correspond to the four blocking assemblies 52 respectively to squeeze the blocking assemblies 52.

[0052] like Figure 2 and Figure 5As shown, the lower molding component 61 includes a lower mold 611, a lower mold cavity 612 is provided on the top of the lower mold 611, a lower injection hole 613 connected to the lower mold cavity 612 is provided on one side of the lower mold 611, and the feed end of the lower injection hole 613 is connected to the discharge end of the lower feeder 41, which is used to inject the grinding part of the workpiece. A through groove 614 for the limit assembly 65 to extend is provided on the side of the lower mold cavity 612 inside the lower mold 611, and a mounting groove 1 615 connected to the through groove 614 is also provided inside the lower mold 611. Receiving grooves 2 617 are provided on the inner bottom walls at both ends of the lower mold cavity 612, which are used to accommodate the isolation assembly 64. A mounting groove 2 616 is provided inside the lower mold 611 and near the bottom of the receiving groove 2 617, and the two receiving grooves 2 617 are respectively connected to the two mounting grooves 2 616.

[0053] like Figure 2 and Figure 5 to Figure 6 As shown, the isolation assembly 64 includes an isolation frame 641 located in the second receiving slot 617. The isolation frame 641 is U-shaped, and one side of the isolation frame 641 has a wavy edge to enhance the connection strength between the grinding part and other parts of the workpiece. Through holes 642 are opened on both sides of the isolation frame 641. When the isolation frame 641 enters the lower mold cavity 612, the through holes 642 correspond to the lower injection hole 613 to allow the material to flow into the isolation frame 641. A plurality of vertical plates 643 are installed at the bottom of the isolation frame 641, and a connecting strip 644 is installed on one side of the plurality of vertical plates 643.

[0054] A connecting rod 645 is provided below the isolation frame 641, one end of each of the connecting strips 644 is mounted on the outside of the top end of the connecting rod 645, a connecting plate 646 located in the second mounting groove 616 is mounted on the bottom end of the connecting rod 645, a sliding column 647 is mounted on the bottom end of the connecting plate 646, and the bottom end of the sliding column 647 passes through the lower mold 611 and extends to the inside of the ejection assembly 62. A second spring 648 is sleeved on the outside of the sliding column 647, the top end of the second spring 648 is mounted on the bottom end of the connecting plate 646, and the bottom end of the second spring 648 is mounted on the inner bottom wall of the second mounting groove 616.

[0055] When the slide column 647 is pushed upward, the slide column 647 drives the isolation frame 641 to move upward through the connecting strip 644 on the connecting rod 645, so that the isolation frame 641 enters the lower mold cavity 612 to isolate the area in the lower mold cavity 612 used for injection molding of the molar, so that the interior of the isolation frame 641 can be separately injected with hard material.

[0056] like Figure 2 , Figure 5 and Figure 7As shown, the limiting assembly 65 includes a wedge block 651 slidably connected in the through slot 614, a vertical rod 652 is installed at the bottom of the wedge block 651, and the bottom end of the vertical rod 652 passes through the lower mold 611 and extends to the inside of the push assembly 62. A mounting ring 653 located in the mounting slot 1 615 is installed on the outer side of the middle part of the vertical rod 652, and a spring 3 654 is sleeved on the outer side of the bottom end of the vertical rod 652, the top end of the spring 3 654 is installed on the bottom end of the mounting ring 653, and the bottom end of the spring 3 654 is installed on the inner bottom wall of the mounting slot 1 615.

[0057] When the vertical rod 652 is pushed upward, the vertical rod 652 can drive the second wedge 651 to enter the chute 515 to squeeze the first wedge 521, so that the sealing plate 523 is blocked on both sides of the top of the isolation frame 641 to prevent materials from entering the isolation frame 641 from the top of the isolation frame 641.

[0058] like Figure 1 to Figure 2 and Figures 5 to 7 As shown, the push assembly 62 includes a connection seat 621 installed on the top of the body 10 and a push plate 622 slidably connected to the connection seat 621, and the bottom ends of the sliding column 647 and the vertical rod 652 are both located above the push plate 622. Guide rods 623 penetrating the push plate 622 are installed on both sides of the inner bottom wall of the connection seat 621, and the push plate 622 is slidably connected to the guide rods 623. A telescopic member 2 63 is provided at the bottom of the push plate 622, and the telescopic member 2 63 is installed on the inner bottom wall of the body 10. The telescopic end of the telescopic member 2 63 penetrates the body 10 and is installed at the bottom of the push plate 622. The structures of the telescopic member 1 25 and the telescopic member 2 63 are the same. In this embodiment, the telescopic member 1 25 is a hydraulic cylinder, and in other embodiments, the telescopic member 1 25 is a cylinder or an electric telescopic rod.

[0059] The second telescopic member 63 can drive the sliding column 647 and the vertical rod 652 to move upward through the push plate 622, so that the isolation frame 641 enters the lower mold cavity 612, and at the same time, the second wedge block 651 moves upward and squeezes the first wedge block 521.

[0060] Working principle: When the workpiece is injected, the mounting seat 21 is driven downward by the telescopic member 25, so that the upper mold 511 is pressed on the lower mold 611. Then the telescopic member 2 63 drives the sliding column 647 and the vertical rod 652 upward through the push plate 622, so that the isolation frame 641 enters the lower mold cavity 612, and at the same time, the wedge block 2 651 moves upward and squeezes the wedge block 1 521. At this time, the wedge block 1 521 drives the sealing plate 523 to enter the upper mold cavity 512 through the fixed plate 522 to block the top two sides of the isolation frame 641, so that the grinding part of the workpiece is isolated.

[0061] Then start the upper feeder 31 and the lower feeder 41, and the soft material in the upper feeder 31 enters the upper mold cavity 512 through the upper injection hole 513 and fills the upper mold cavity 512 and the unisolated lower mold cavity 612. At the same time, the lower feeder 41 enters the lower mold cavity 612 isolated by the isolation frame 641 through the lower injection hole 613 and fills the isolation frame 641.

[0062] When the isolation frame 641 is filled, the lower feeder 41 stops feeding, and the telescopic part 2 63 drives the push plate 622 to move downward. At this time, the sealing plate 523 is reset to enter the storage groove 1 514, and the isolation frame 641 is reset to enter the storage groove 2 617, and then the upper feeder 31 continues to feed. At this time, the soft material fills the gap between the sealing plate 523 and the isolation frame 641 after they are folded. When the injection molding is completed, the telescopic part 1 25 drives the upper mold 511 to reset through the mounting seat 21 to take out the workpiece. The soft and hard materials in the workpiece after injection molding can be tightly connected together, ensuring the connection strength of the soft and hard materials in the workpiece, and the workpiece after injection molding can also avoid damage or deformation of the grinding teeth in the workpiece.

[0063] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A device for injection molding of an orthodontic appliance, comprising a body, a lifting mechanism, an upper feeding mechanism and a lower feeding mechanism, characterized in that: An upper injection molding mechanism is installed on the lifting mechanism, and a lower injection molding mechanism is installed on the machine body; The upper injection molding mechanism includes an upper mold and two groups of blocking components slidably connected to the upper mold. The upper mold is provided with an upper mold cavity, and both ends of the upper mold cavity are provided with a receiving groove 1; the blocking component includes a sealing plate elastically slidably connected to the receiving groove 1 along the length direction of the receiving groove 1; The lower injection molding mechanism includes a lower mold and two isolation components located in the lower mold. The lower mold is provided with a lower mold cavity. The inner bottom walls at both ends of the lower mold cavity are provided with receiving grooves 2 for accommodating the isolation components. The isolation components include an isolation frame elastically slidably connected in the receiving grooves 2 along the vertical direction to mold the grinding teeth of the workpiece, and the isolation frame has a wavy edge. The plugging assembly also includes a wedge block 1, on which a fixing plate connected to the sealing plate is installed, and a sliding groove for the wedge block 1 to slide is provided inside the upper mold; A push assembly is installed at the bottom of the lower mold, and four limit assemblies are installed on one side of the lower mold near the isolation frame, and the limit assemblies correspond to wedge block 1 to squeeze wedge block 1; The push assembly includes a connecting seat installed on the top of the machine body and a push plate slidably connected to the connecting seat. The bottom of the push plate is provided with a telescopic part 2 for driving the push plate to slide. When the upper mold is pressed on the lower mold, the isolation frame moves up to the lower mold cavity, and the sealing plate enters the upper mold cavity and is located on the top of the isolation frame to isolate the grinding part of the workpiece so as to fill different parts of the workpiece with materials of different hardness. An upper injection hole connected to the upper mold cavity is opened on the top of the upper mold, and the feed end of the upper injection hole is connected to the discharge end of the upper feeding mechanism; a lower injection hole connected to the lower mold cavity is opened on one side of the lower mold, and the feed end of the lower injection hole is connected to the discharge end of the lower feeding mechanism, and through holes are opened on both sides of the isolation frame. When the isolation frame is located in the lower mold cavity, the through holes correspond to the lower injection holes.

2. The orthodontic appliance injection molding device according to claim 1, characterized in that: A plurality of vertical plates are installed at the bottom of the isolation frame, and a connection bar is installed on each of the plurality of vertical plates.

3. The orthodontic appliance injection molding device according to claim 2, characterized in that: A connecting rod is provided below the isolation frame, and a plurality of connecting strips are mounted on the connecting rod. A connecting plate is mounted on the bottom end of the connecting rod, and a sliding column is mounted on the connecting plate. The bottom end of the sliding column passes through the lower mold and extends into the ejection assembly.

4. The orthodontic appliance injection molding device according to claim 1, characterized in that: The interior of the lower mold is also provided with a mounting groove 1 which is connected with the through groove.

5. The orthodontic appliance injection molding device according to claim 4, characterized in that: The limiting assembly includes a wedge block 2 slidably connected in the through groove, a vertical rod is installed on the wedge block 2, the bottom end of the vertical rod passes through the lower mold and extends into the push assembly, and a mounting ring is installed on the outer side of the vertical rod and elastically slidably connected in the mounting groove 1 along the vertical direction.

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