A cyclic injection mold based on a plastic burr in-situ treatment structure

Abstract

This invention relates to the field of plastic injection molding technology, specifically to a circulating injection mold based on an in-situ deburring structure for plastics. It includes a frame and a moving mold and a fixed mold mounted on the top of the frame and distributed to the left and right. An injection molding mechanism is installed on the right side of the fixed mold. The mold also includes a deburring mechanism and a circulating mechanism. An ejector rod is installed inside the moving mold. When the moving mold and fixed mold separate, a flipping drive unit drives a rotating plate to flip downwards, causing the die holder to be positioned outside the plastic part. When the ejector rod pushes the plastic part to the right for demolding, the burrs on the edge of the plastic part will sequentially contact the second and first hot-cutting blades. The second hot-cutting blade separates the burrs on the edge of the plastic part, preventing them from merging together. Then, the first hot-cutting blade cuts off the burrs. By treating the burrs during demolding, no additional deburring process is needed, improving the processing efficiency of the plastic part.

Description

Technical Field

[0001] This invention relates to the field of plastic injection molding technology, specifically to a cyclic injection mold based on an in-situ burr treatment structure for plastics. Background Technology

[0002] Injection molding machines are the main molding equipment used to make various shapes of plastic products from thermoplastic or thermosetting materials using plastic molds. Injection molding is achieved through injection molding machines and molds.

[0003] After injection molding, plastic parts are prone to developing burrs and flash on their edges, mostly occurring at the mold's parting and closing points. These burrs and flash are largely caused by the failure of the mold or machine's clamping force. Generally speaking, due to various factors, it is impossible for plastic parts to be completely free of flash.

[0004] The existing method involves a separate deburring process after the plastic parts are cut to size, using manual hand-held scrapers or a robotic arm carrying a grinding blade to remove burrs. This method increases the number of processing steps in the plastic parts production process, leading to a longer production cycle and affecting production efficiency. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a circulating injection mold based on an in-situ plastic burr treatment structure, comprising a frame and a moving mold and a fixed mold mounted on the top of the frame and distributed to the left and right. An injection molding mechanism is mounted on the right side of the fixed mold, and the mold also includes a burr treatment mechanism for treating burrs and a circulating mechanism. An ejector rod is installed inside the moving mold.

[0006] The deburring mechanism includes a tool holder located on the right side of the moving mold. A hot cutting blade of the same shape as the edge of the plastic part is fixedly installed on the left side of the tool holder. Several hot cutting blades of the second type are evenly distributed around the circumference on the outer wall of the tool holder. A flipping mechanism for driving the tool holder to flip and move is installed on the moving mold. A clamping member for pressing the right side of the plastic part is provided on the right side of the tool holder.

[0007] The flipping mechanism includes a movable frame that is movably mounted on the right side of the moving mold. A rotating plate is rotatably mounted on the bottom of the movable frame via a rotating shaft. The bottom of the rotating plate is fixedly connected to the top of the tool holder. A flipping drive unit for driving the rotating plate to flip up and down is mounted on the movable frame. An electric push rod for pushing the movable frame to move left and right is mounted on the moving mold.

[0008] In one possible implementation, the cutting portion of the second hot cutter is located to the left of the first hot cutter, and one end of the second hot cutter near the center of the first hot cutter extends to be flush with the inner wall of the first hot cutter.

[0009] In one possible implementation, wing plates are fixedly connected to both the front and rear sides of the movable frame, and an elastic telescopic rod is fixedly connected between the left side of the wing plate and the right side of the movable mold.

[0010] In one possible implementation, the flipping drive unit includes gears fixedly connected to the front and rear sides of the rotating plate and coaxial with the rotating shaft. The bottom of the gears meshes with a rack, which is slidably mounted inside the movable frame. The left ends of the two racks are fixedly connected to a push plate, the top of which extends to the top of the movable frame. The right end of the telescopic section of the electric push rod is fixedly connected to the left side of the push plate.

[0011] In one possible implementation, a telescopic assembly for guiding the clamping member to move to the left is mounted on the right side of the rotating plate. The telescopic assembly is equipped with a locking component for limiting the leftward movement of the clamping member and an unlocking component for releasing the restriction.

[0012] In one possible implementation, the telescopic assembly includes a fixed sleeve fixedly connected to the right side of the rotating plate, a movable rod slidably mounted on the right end of the fixed sleeve, a support rod fixedly connected to the right end of the movable rod, the bottom end of the support rod being fixedly connected to a clamping member, and a tension spring fixedly connected between the left side of the top of the support rod and the right side of the rotating plate.

[0013] In one possible implementation, the locking assembly includes a housing fixedly connected to the front side of the fixed sleeve, a movable block slidably mounted inside the housing, a wedge block fixedly connected to the rear end of the movable block, a plurality of triangular grooves evenly distributed to the left and right on the front side of the movable rod, the rear end of the wedge block sliding through the interior of the fixed sleeve and engaging with the triangular grooves, and a return spring fixedly connected between the front side of the movable block and the inner wall of the housing.

[0014] In one possible implementation, the unlocking component includes a groove formed at the front end of the movable block, a rotating rod rotatably mounted on the front side of the housing, the rear end of the rotating rod extending into and rotatably connected to the groove, a plurality of spirally distributed guide grooves on the inner wall of the groove, guide blocks corresponding one-to-one with the guide grooves fixedly connected to the outer ring wall of the rotating rod, the guide blocks slidingly connected to the corresponding guide grooves, a push rod located in front of the housing fixedly connected to the front end of the rotating rod, and a blocking unit mounted on the movable frame.

[0015] In one possible implementation, the blocking unit includes a stop bar rotatably mounted on the right side of the movable frame, a return spring 2 fixedly connected between the bottom of the stop bar and the right side of the movable frame, and a stop block fixedly connected to the top of the left end of the stop bar, the left side of the stop block abutting against the right side of the movable frame.

[0016] In one possible implementation, the circulation mechanism includes a receiving port located at the top of the frame, which is positioned just above a negative pressure feeding system mounted on the frame when the moving mold is now in its maximum position. The suction port of the negative pressure feeding system is connected to the receiving port, and the discharge port is located above the hopper of the injection molding mechanism.

[0017] The beneficial effects of this invention are as follows: 1. When the moving mold and the fixed mold are separated, the rotating plate is rotated downward by the flipping drive unit, and the knife holder is rotated to the right side of the plastic part. Then, the electric push rod drives the movable frame to move to the left, so that the knife holder is sleeved on the outside of the plastic part. When the ejector rod pushes the plastic part to the right for demolding, the burrs on the edge of the plastic part will come into contact with the second hot cutting knife and the first hot cutting knife in sequence. The second hot cutting knife is used to separate the burrs on the edge of the plastic part to prevent the burrs from forming a whole. Then the first hot cutting knife cuts off the burrs. By processing the burrs during the demolding process, there is no need to add an additional deburring process afterward, which improves the processing efficiency of the plastic part.

[0018] 2. In this invention, when the ejector rod ejects the plastic part, the clamping component and the ejector rod work together to clamp the plastic part, causing the plastic part to move to the right during clamping. This prevents the plastic part from shifting downwards due to gravity during demolding, which could lead to misalignment between the hot cutting blades and the edge of the plastic part, causing the hot cutting blades to scratch the plastic part. This improves the burr removal effect of the hot cutting blades.

[0019] 3. This invention limits the clamping component through the cooperation of the telescopic component, locking component, and unlocking component. The telescopic component gives the clamping component a tendency to move to the left, so that the clamping component can press against the right side of the plastic part. When the ejector rod moves to the left to reset after ejection, the telescopic component cannot drive the clamping component to move to the left under the restriction of the locking component. This avoids the clamping component pushing the plastic part to the left again under the drive of the telescopic component, which facilitates the discharge of the plastic part. When the burr treatment mechanism switches from the cutting station to the non-cutting station, the unlocking component can release the restriction of the locking component on the telescopic component, so that the telescopic component drives the clamping component to move towards the tool holder to reset. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0021] Figure 2 This is a three-dimensional structural diagram of the burr removal mechanism of the present invention in the cutting station.

[0022] Figure 3 This is a front sectional view of the burr removal mechanism of the present invention.

[0023] Figure 4This is a three-dimensional structural diagram of the hot cutting blade one and hot cutting blade two of the present invention.

[0024] Figure 5 This is a three-dimensional structural schematic diagram of the hot cutting blade II of the present invention.

[0025] Figure 6 This is a three-dimensional structural diagram of the flipping mechanism of the present invention.

[0026] Figure 7 This is a partial cross-sectional view of the telescopic component of the present invention.

[0027] Figure 8 This is a partial cross-sectional view of the locking component of the present invention.

[0028] Figure 9 This is a three-dimensional structural diagram of the burr removal mechanism of the present invention when it is in a non-cutting position.

[0029] In the diagram: 1. Frame; 2. Moving mold; 21. Ejector rod; 3. Fixed mold; 4. Deburring mechanism; 41. Tool holder; 42. Hot cutting knife one; 43. Hot cutting knife two; 44. Tilting mechanism; 441. Movable frame; 442. Wing plate; 443. Elastic telescopic rod; 444. Turning plate; 445. Tilting drive unit; 4451. Gear; 4452. Rack; 4453. Push plate; 446. Electric push rod; 45. Clamping part; 46. Telescopic assembly; 461. Fixed sleeve; 462. Movable rod; 463. 464. Support rod; 47. Tension spring; 48. Locking assembly; 49. Housing; 40. Movable block; 41. Wedge block; 42. Triangular groove; 43. Return spring one; 44. Unlocking assembly; 45. Groove; 46. Rotating rod; 47. Guide groove; 48. Guide block; 49. Push rod; 40. Blocking unit; 41. Stop bar; 42. Return spring two; 43. Stop block; 44. Circulation mechanism; 55. Material inlet; 56. Negative pressure feeding system; 57. Injection molding mechanism. Detailed Implementation

[0030] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be implemented in many other ways different from those described below, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0031] Please see Figure 1 - Figure 9A circulating injection mold based on a plastic burr in-situ treatment structure includes a frame 1 and a moving mold 2 and a fixed mold 3 installed on the top of the frame 1 and distributed on the left and right. An injection mechanism 6 is installed on the right side of the fixed mold 3. The mold also includes a burr treatment mechanism 4 and a circulating mechanism 5. An ejector rod 21 is installed inside the moving mold 2.

[0032] The deburring mechanism 4 includes a tool holder 41 located on the right side of the moving mold 2. A hot cutting blade 42 with the same shape as the edge of the plastic part is fixedly installed on the left side of the tool holder 41. Several hot cutting blades 43 are evenly distributed around the circumference on the outer wall of the tool holder 41. A flipping mechanism 44 for driving the tool holder 41 to flip and move is installed on the moving mold 2. A clamping member 45 for pressing the right side of the plastic part is provided on the right side of the tool holder 41.

[0033] The flipping mechanism 44 includes a movable frame 441 that is movably mounted on the right side of the moving mold 2. A rotating plate 444 is rotatably mounted on the bottom of the movable frame 441 via a rotating shaft. The bottom of the rotating plate 444 is fixedly connected to the top of the tool holder 41. A flipping drive unit 445 for driving the rotating plate 444 to flip up and down is mounted on the movable frame 441. An electric push rod 446 for pushing the movable frame 441 to move left and right is mounted on the moving mold 2. A notch is provided on the top of the fixed mold 3 for horizontal placement of the tool holder 41, hot cutting blade 1 42 and hot cutting blade 2 43 to avoid affecting the mold closing of the moving mold 2 and the fixed mold 3.

[0034] In actual use, in the initial state, the moving mold 2 and the fixed mold 3 are closed together, the deburring mechanism 4 is in the non-cutting position, the rotating plate 444 is in the horizontal position, and the tool holder 41, hot cutting blade 1 42 and hot cutting blade 2 43 are located at the notch at the top of the fixed mold 3. After injection molding is completed, the moving mold 2 moves to the left to open the mold. The moving mold 2 drives the deburring mechanism 4 to move to the left together. When the tool holder 41 moves to the left side of the fixed mold 3, the rotating plate 444 is rotated down 90 degrees by the flipping drive unit 445, so that the tool holder 41 rotates to the right side of the plastic part. Then the electric push rod 446 drives the movable frame 441 to move to the left, so that the tool holder 41 is sleeved on the outside of the plastic part, and the clamping part 45 is pressed on the right side of the plastic part. At this time, the deburring mechanism 4 switches to the cutting position.

[0035] Then, the ejector rod 21 pushes the plastic part to the right, and the clamping part 45 moves to the right together while keeping the plastic part pressed. The burrs on the edge of the plastic part first come into contact with the second hot cutting blade 43. The second hot cutting blade 43 is used to cut the burrs to prevent them from connecting into one piece, which would cause the burrs to stick on the moving mold 2 and not fall off. Then the burrs come into contact with the first hot cutting blade 42. The first hot cutting blade 42 is used to cut the burrs off the plastic part. The cut burrs fall off naturally under the action of gravity. When the plastic part is completely separated from the moving mold 2 and moves to the right side of the blade holder 41, the ejector rod 21 moves to the left to reset. At this time, the plastic part is removed manually or by an existing robot.

[0036] Then, the electric push rod 446 pushes the movable frame 441 to the right, causing the rotating plate 444 to drive the tool holder 41, hot cutting blade 1 42 and hot cutting blade 2 43 to move to the right. Then, the flip drive unit 445 drives the rotating plate 444 to flip upward, rotating the tool holder 41, hot cutting blade 1 42 and hot cutting blade 2 43 to the top of the fixed mold 3, so that the burr treatment mechanism 4 switches to the non-cutting station. Finally, the moving mold 2 moves to the right and closes with the fixed mold 3 to perform subsequent injection molding of plastic parts.

[0037] Please see Figure 4 - Figure 5 The cutting part of the second hot cutting blade 43 is located on the left side of the first hot cutting blade 42. The end of the cutting part of the second hot cutting blade 43 near the center of the first hot cutting blade 42 extends to be flush with the inner wall of the first hot cutting blade 42.

[0038] In practical use, by setting the cutting part of the second hot cutting blade 43 to the left of the first hot cutting blade 42, the second hot cutting blade 43 can cut the burrs on the plastic part before the first hot cutting blade 42. The end of the second hot cutting blade 43 is flush with the inner wall of the first hot cutting blade 42, which can ensure that the second hot cutting blade 43 cuts the burrs into multiple segments and does not leave cut marks on the plastic part.

[0039] Please see Figure 2 and Figure 6 The front and rear sides of the movable frame 441 are fixedly connected with wing plates 442, and the left side of the wing plate 442 and the right side of the movable mold 2 are fixedly connected with elastic telescopic rods 443.

[0040] In practical use, the elastic telescopic rod 443 is in a compressed state. The elastic telescopic rod 443 provides a rightward elastic force to the wing plate 442, causing the wing plate 442 and the movable frame 441 to tend to move to the right. When the flipping drive unit 445 drives the rotating plate 444 to flip downward, the elastic telescopic rod 443 can push the movable frame 441 to the right, preventing the movable frame 441 from moving to the left.

[0041] Please see Figure 1 , Figure 2 , Figure 3 and Figure 6 The flipping drive unit 445 includes gears 4451 fixedly connected to the front and rear sides of the rotating plate 444 and coaxial with the rotating shaft. The bottom of the gears 4451 meshes with racks 4452. The racks 4452 are slidably installed inside the movable frame 441. The left ends of the two racks 4452 are fixedly connected to push plates 4453. The top of the push plates 4453 extends to the top of the movable frame 441. The right end of the telescopic section of the electric push rod 446 is fixedly connected to the left side of the push plates 4453.

[0042] In practical use, when the rotating plate 444 needs to be flipped downwards, the electric push rod 446 drives the push plate 4453 to move to the left. When the push plate 4453 moves to the left, the elastic telescopic rod 443 supports the movable frame 441 to the right, preventing the movable frame 441 from moving to the left together with the push plate 4453. Then, the push plate 4453 drives the rack 4452 to move to the left, causing the rack 4452 to drive the gear 4451 to rotate clockwise. The gear 4451 drives the rotating plate 444 to flip downwards, switching the rotating plate 444 from a horizontal state to a vertical state. At this time, the knife holder 41 rotates to the right side of the plastic part, while the left side of the push plate 4453 moves to the side of the movable frame 441 and comes into contact with it. Then, the electric push rod 446 continues to drive the push plate 4453 to move to the left, causing the push plate 4453 to drive the movable frame 441 to move to the left, so that the knife holder 41 is fitted over the outside of the plastic part, making it easy to cut the burrs on the plastic part.

[0043] When the rotating plate 444 is to be flipped upwards, the electric push rod 446 drives the push plate 4453 to move to the right. When the push plate 4453 moves to the left, the elastic telescopic rod 443 pushes the movable frame 441 to the right, causing the movable frame 441 and the push plate 4453 to move to the right together. The movable frame 441 drives the rotating plate 444 and the tool holder 41 to move to the right, so that the tool holder 41, the first hot cutting blade 42, and the second hot cutting blade 43 are completely moved to the right side of the moving mold 2. When the elastic telescopic rod... When 443 is extended to its maximum state, the movable frame 441 stops moving to the right. Then, the electric push rod 446 pushes the push plate 4453 to continue moving to the right, causing the rack 4452 to move to the right relative to the movable frame 441. The rack 4452 drives the gear 4451 to rotate counterclockwise, causing the gear 4451 to drive the rotating plate 444 to rotate counterclockwise, switching the rotating plate 444 from a vertical state to a horizontal state, so as to avoid affecting the subsequent mold closing of the moving mold 2 and the fixed mold 3.

[0044] Please see Figure 1 - Figure 4 On the right side of the rotating plate 444, a telescopic assembly 46 is installed to guide the clamping member 45 to move to the left. The telescopic assembly 46 is equipped with a locking assembly 47 to limit the leftward movement of the clamping member 45 and an unlocking assembly 48 to release the restriction.

[0045] Please see Figure 2 , Figure 4 and Figure 7 The telescopic assembly 46 includes a fixed sleeve 461 fixedly connected to the right side of the rotating plate 444. A movable rod 462 is slidably installed on the right end of the fixed sleeve 461. A support rod 463 is fixedly connected to the right end of the movable rod 462. The bottom end of the support rod 463 is fixedly connected to the clamping member 45. A tension spring 464 is fixedly connected between the left side of the top end of the support rod 463 and the right side of the rotating plate 444.

[0046] In practical use, the tension spring 464 provides elastic force to the support rod 463 to move to the left. When the clamping member 45 moves to the right side of the plastic part, the clamping member 45 clamps the plastic part from the right side. This prevents the plastic part from shifting downwards under its own weight when the ejector rod 21 pushes the plastic part to the right, causing misalignment between the hot cutting blade 1 42, hot cutting blade 2 43 and the edge of the plastic part, which could result in the hot cutting blade 1 42 and hot cutting blade 2 43 scratching the plastic part. The fixed sleeve 461 and the movable rod 462 support and guide the support rod 463, improving the stability of the clamping member 45 when it moves left and right.

[0047] Please see Figure 4 , Figure 7 and Figure 8 The locking assembly 47 includes a housing 471 fixedly connected to the front side of the fixed sleeve 461. A movable block 472 is slidably installed inside the housing 471. A wedge block 473 is fixedly connected to the rear end of the movable block 472. A plurality of triangular grooves 474 are equidistantly distributed on the front side of the movable rod 462. The rear end of the wedge block 473 slides through the interior of the fixed sleeve 461 and engages with the triangular grooves 474. The rear end of the inclined side of the wedge block 473 is tilted to the right. A return spring 475 is fixedly connected between the front side of the movable block 472 and the inner wall of the housing 471.

[0048] In practical use, the return spring 475 provides elastic force to the movable block 472 to move backward, so that the movable block 472 and the wedge block 473 have a tendency to move backward. When the tension spring 464 pulls the movable rod 462 to move to the left, the wedge block 473 is engaged with the triangular groove 474 to restrict the movable rod 462 and prevent the movable rod 462 from driving the support rod 463 and the clamping member 45 to move to the left. When the ejector rod 21 moves to the left to reset, the clamping member 45 will not move to the left under the action of the tension spring 464, preventing the clamping member 45 from pushing the plastic part to the left and fitting it onto the moving mold 2, which facilitates the unloading of the plastic part.

[0049] Please see Figure 2 , Figure 6 , Figure 7 and Figure 8The unlocking component 48 includes a groove 481 formed at the front end of the movable block 472. A rotating rod 482 is rotatably mounted on the front side of the housing 471. The rear end of the rotating rod 482 extends into the interior of the groove 481 and is rotatably connected thereto. A plurality of spirally distributed guide grooves 483 are formed on the inner wall of the groove 481. A guide block 484 corresponding to the guide groove 483 is fixedly connected to the outer ring wall of the rotating rod 482. The guide block 484 is slidably connected to the corresponding guide groove 483. A push rod 485 located in front of the housing 471 is fixedly connected to the front end of the rotating rod 482. A blocking unit 486 is installed on the movable frame 441.

[0050] Please see Figure 2 , Figure 4 , Figure 6 , Figure 7 and Figure 8 The blocking unit 486 includes a stop bar 4861 rotatably mounted on the right side of the movable frame 441. A return spring 4862 is fixedly connected between the bottom of the stop bar 4861 and the right side of the movable frame 441. A stop block 4863 is fixedly connected to the top of the left end of the stop bar 4861. The left side of the stop block 4863 abuts against the right side of the movable frame 441. The stop bar 4861 and the push rod 485 are coplanar.

[0051] In practical use, the return spring 4862 continues the upward force of the stop lever 4861, causing the stop lever 4861 to have a tendency to rotate counterclockwise. When the stop lever 4861 is in a horizontal state, the stop block 4863 blocks the stop lever 4861, preventing the stop lever 4861 from continuing to rotate counterclockwise.

[0052] When the rotating plate 444 rotates counterclockwise, it drives the telescopic assembly 46, locking assembly 47, and unlocking assembly 48 to rotate counterclockwise together. During the counterclockwise rotation, the push rod 485 will come into contact with the stop rod 4861, which will block the push rod 485. As the telescopic assembly 46 and locking assembly 47 continue to rotate counterclockwise, the push rod 485 will deflect counterclockwise under the obstruction of the stop rod 4861. The push rod 485 drives the rotating rod 482 and the guide rod 486 to rotate counterclockwise. The guide block 484 rotates counterclockwise. When the guide block 484 rotates, it moves along the guide groove 483. The mutual cooperation between the guide block 484 and the guide groove 483 drives the movable block 472 and the wedge block 473 to move forward, so that the wedge block 473 releases the lock on the movable rod 462. At this time, the tension spring 464 drives the support rod 463 and the movable rod 462 to move towards the tool holder 41. The support rod 463 drives the clamping member 45 to move towards the tool holder 41 to reset.

[0053] When the push rod 485 rotates to be perpendicular to the end of the stop rod 4861, the push rod 485 is no longer blocked by the stop rod 4861. At this time, the push rod 485 can move together with the housing 471 to the top of the stop rod 4861. Then, the return force of the return spring 475 pushes the movable block 472 to move backward, so that the wedge block 473 re-locks the triangular groove 474. When the movable block 472 moves backward, the guide groove 483 guides the rotating rod 482 to rotate in the opposite direction and reset.

[0054] When the rotating plate 444 rotates clockwise, the push rod 485 will abut against the top of the stop rod 4861. The push rod 485 will push the stop rod 4861 to deflect clockwise. At this time, the second return spring 4862 is compressed and contracts to prevent the stop rod 4861 from blocking the push rod 485 from deflecting downward. When the push rod 485 moves to below the stop rod 4861, the stop rod 4861 will rotate counterclockwise under the push of the return spring 4862, so that the stop rod 4861 returns to the horizontal state.

[0055] Please see Figure 1 The circulation mechanism 5 includes a receiving port 51 located on the top of the frame 1. When the moving mold 2 is now moved to its maximum position, the receiving port 51 is located on the frame 1 where a negative pressure feeding system 52 is installed. The suction port of the negative pressure feeding system 52 is connected to the receiving port 51, and the discharge port is located above the hopper of the injection molding mechanism 6.

[0056] In practical use, the negative pressure feeding system 52 generates a negative pressure attraction at the receiving port 51. The cut burrs will fall under the action of gravity. When the burrs approach the receiving port 51, the negative pressure attraction will suck the burrs into the receiving port 51. Then, the negative pressure feeding system 52 will transport the burrs into the hopper of the injection molding mechanism 6, which will facilitate the recycling of waste materials and reduce material waste.

[0057] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "connected," "installed," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, an integral connection, or a sliding connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0058] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made based on the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A circulating injection mold based on a plastic burr in-situ treatment structure, comprising a frame (1) and a moving mold (2) and a fixed mold (3) mounted on the top of the frame (1) and distributed to the left and right, wherein an injection molding mechanism (6) is mounted on the right side of the fixed mold (3), characterized in that: It also includes a burr processing mechanism (4) for burr removal and a circulation mechanism (5), wherein an ejector rod (21) is installed inside the moving mold (2); The burr removal mechanism (4) includes a knife holder (41) located on the right side of the moving mold (2). A hot cutting knife (42) with the same shape as the edge of the plastic part is fixedly installed on the left side of the knife holder (41). Several hot cutting knives (43) are evenly distributed around the circumference on the outer wall of the knife holder (41). A flipping mechanism (44) for driving the knife holder (41) to flip and move is installed on the moving mold (2). A clamping member (45) for pressing the right side of the plastic part is provided on the right side of the knife holder (41). The flipping mechanism (44) includes a movable frame (441) that is movably mounted on the right side of the moving mold (2). A rotating plate (444) is rotatably mounted on the bottom of the movable frame (441) via a rotating shaft. The bottom of the rotating plate (444) is fixedly connected to the top of the tool holder (41). A flipping drive unit (445) for driving the rotating plate (444) to flip up and down is mounted on the movable frame (441). An electric push rod (446) for pushing the movable frame (441) to move left and right is mounted on the moving mold (2).

2. A circulating injection mold based on an in-situ plastic burr treatment structure according to claim 1, characterized in that: The cutting part of the second hot cutter (43) is located on the left side of the first hot cutter (42), and one end of the second hot cutter (43) near the center of the first hot cutter (42) extends to be flush with the inner wall of the first hot cutter (42).

3. A circulating injection mold based on an in-situ plastic burr treatment structure according to claim 1, characterized in that: The movable frame (441) is fixedly connected to both the front and rear sides with wing plates (442), and an elastic telescopic rod (443) is fixedly connected between the left side of the wing plate (442) and the right side of the movable mold (2).

4. A circulating injection mold based on an in-situ plastic burr treatment structure according to claim 1, characterized in that: The flipping drive unit (445) includes gears (4451) fixedly connected to the front and rear sides of the rotating plate (444) and coaxial with the rotating shaft. The bottom of the gears (4451) meshes with racks (4452). The racks (4452) are slidably installed inside the movable frame (441). The left ends of the two racks (4452) are fixedly connected to push plates (4453). The top of the push plates (4453) extends to the top of the movable frame (441). The right end of the telescopic section of the electric push rod (446) is fixedly connected to the left side of the push plates (4453).

5. A circulating injection mold based on an in-situ plastic burr treatment structure according to claim 1, characterized in that: The right side of the rotating plate (444) is equipped with a telescopic assembly (46) for guiding the clamping member (45) to move to the left. The telescopic assembly (46) is equipped with a locking assembly (47) for restricting the clamping member (45) from moving to the left and an unlocking assembly (48) for releasing the restriction.

6. A circulating injection mold based on an in-situ plastic burr treatment structure according to claim 5, characterized in that: The telescopic assembly (46) includes a fixed sleeve (461) fixedly connected to the right side of the rotating plate (444). A movable rod (462) is slidably installed on the right end of the fixed sleeve (461). A support rod (463) is fixedly connected to the right end of the movable rod (462). The bottom end of the support rod (463) is fixedly connected to the clamping member (45). A tension spring (464) is fixedly connected between the left side of the top of the support rod (463) and the right side of the rotating plate (444).

7. A circulating injection mold based on an in-situ plastic burr treatment structure according to claim 6, characterized in that: The locking assembly (47) includes a housing (471) fixedly connected to the front side of the fixed sleeve (461). A movable block (472) is slidably installed inside the housing (471). A wedge block (473) is fixedly connected to the rear end of the movable block (472). A plurality of triangular grooves (474) are equidistantly distributed on the front side of the movable rod (462). The rear end of the wedge block (473) slides through the interior of the fixed sleeve (461) and engages with the triangular grooves (474). A return spring (475) is fixedly connected between the front side of the movable block (472) and the inner wall of the housing (471).

8. A circulating injection mold based on an in-situ plastic burr treatment structure according to claim 7, characterized in that: The unlocking component (48) includes a groove (481) formed at the front end of the movable block (472). A rotating rod (482) is rotatably mounted on the front side of the housing (471). The rear end of the rotating rod (482) extends into the interior of the groove (481) and is rotatably connected thereto. A plurality of spiral and circumferentially distributed guide grooves (483) are formed on the inner wall of the groove (481). A guide block (484) corresponding to the guide groove (483) is fixedly connected to the outer ring wall of the rotating rod (482). The guide block (484) is slidably connected to the corresponding guide groove (483). A push rod (485) located in front of the housing (471) is fixedly connected to the front end of the rotating rod (482). A blocking unit (486) is installed on the movable frame (441).

9. A circulating injection mold based on an in-situ plastic burr treatment structure according to claim 8, characterized in that: The blocking unit (486) includes a stop bar (4861) rotatably mounted on the right side of the movable frame (441). A return spring (4862) is fixedly connected between the bottom of the stop bar (4861) and the right side of the movable frame (441). A stop block (4863) is fixedly connected to the top of the left end of the stop bar (4861). The left side of the stop block (4863) abuts against the right side of the movable frame (441).

10. A circulating injection mold based on an in-situ plastic burr treatment structure according to claim 1, characterized in that: The circulation mechanism (5) includes a receiving port (51) opened on the top of the frame (1). When the moving mold (2) is now moved to the maximum position, the receiving port (51) is just located on the frame (1) where a negative pressure feeding system (52) is installed. The suction port of the negative pressure feeding system (52) is connected to the receiving port (51), and the discharge port is located above the hopper of the injection molding mechanism (6).

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