Multi-section delayed ejection mechanism for injection mold

Abstract

The invention provides a multi-section delayed ejection mechanism for an injection mold, and belongs to the technical field of injection products. The ejection mechanism comprises an upper mold, a lower mold and a delayed ejection assembly, and the upper mold and the lower mold are in butt joint in the first direction to form a cavity and an injection molding channel; the delayed ejection assembly comprises a first ejection rod, a second ejection rod and a discharging plate which are inserted into the lower mold in the first direction, the first ejection rod can extend to the cavity, the second ejection rod can extend to the injection molding channel, and a communicating hole is formed in the discharging plate; the first ejector rod, the second ejector rod and the discharging plate can be driven by external force to move towards the other side of the lower die in sequence. Under pushing of the second ejector rod, part of the waste is limited by the inner wall of the injection molding channel to deform so as to move out of the lower mold in the first direction, can be reset outside the lower mold and collides with the discharging plate in the reset process so as to move to the waste recycling position in the direction away from the discharging plate under the collision effect, and automatic recycling of the waste is achieved; and the waste recovery efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of injection molding products, and in particular relates to a multi-stage delayed ejection mechanism for an injection mold. Background Art

[0002] The injection mold includes a molding system and a pouring system. The melt is injected into the molding system through the pouring system. The melt forms the final product in the molding system, and the pouring system forms pouring agglomerate, also known as sprue material or waste. The waste does not belong to the final product. After molding, it needs to be separated from the product by manual or automated means and recycled.

[0003] In the prior art, a multi-stage delayed ejection mechanism is used to eject products. The ejector pin corresponding to the product is ejected first, and the mold's constraints are used to forcibly sever the connection between the waste material and the product. This separates the product from the waste material during the ejection process, and the waste material is then ejected and disposed of.

[0004] However, in different injection molding processes, after the waste is ejected from the mold, the position of the waste on the mold surface is uncertain. Therefore, manual picking of the waste is generally adopted and the waste is placed in a designated position, resulting in low waste disposal efficiency. Summary of the Invention

[0005] The purpose of this application is to provide a multi-stage delayed ejection mechanism for an injection mold to solve the above-mentioned technical problems existing in the prior art.

[0006] This application is implemented as follows: The embodiment of the present application provides a multi-stage delayed ejection mechanism for an injection mold, comprising an upper mold, a lower mold and a delayed ejection assembly, wherein the upper mold and the lower mold are butted together along a first direction to form a cavity and an injection channel, the injection channel comprising a first sub-segment located in the lower mold, the axis of the first sub-segment being inclined relative to the first direction and connected to the cavity; the delayed ejection assembly comprising a first ejector rod, a second ejector rod and a blanking plate which are plugged into the lower mold from a side of the lower mold away from the upper mold along the first direction, the first ejector rod being able to extend to the cavity, the second ejector rod being able to extend to the injection channel, and the first sub-segment being located at the opening end of the lower mold on the extension path of the second ejector rod, the blanking plate being provided with a connecting hole for connecting The hole can be connected with the first sub-segment so that the inner wall of the connecting hole is flush with the inner wall of the first sub-segment; the first push rod, the second push rod and the blanking plate can be moved toward the other side of the lower mold in sequence under the drive of external force, so that the product in the cavity and the waste in the injection channel are separated from the lower mold in sequence, and the blanking plate moves to the outside of the lower mold and blocks the product and the waste; under the push of the second push rod, part of the waste corresponding to the first sub-segment is deformed under the restriction of the inner wall of the first sub-segment to move to the outside of the lower mold along the first direction, and can be reset outside the lower mold, and collide with the blanking plate during the reset process, and thus move in the direction away from the blanking plate to the waste recovery area under the action of the collision.

[0007] The technical solution adopted by the present invention can achieve the following beneficial effects: In the present application, when the waste is ejected from the lower mold, the waste is restricted by the shape of the first sub-segment, and the waste will deform and store energy at the same time. After the waste leaves the lower mold, the deformed part rebounds and collides with the blanking plate. The waste rebounds under the action of the collision with the blanking plate and moves away from the blanking plate to the waste recovery area, thereby realizing automatic recycling of the waste and improving the recycling efficiency of the waste; and the blanking plate is provided with a connecting hole, which is connected to the injection molding channel to avoid the existence of the blanking plate affecting the normal injection molding of the product. At the same time, the blanking plate moves after the second ejector rod moves. After the second ejector rod pushes the waste out of the connecting hole, the blanking plate can be driven to move to avoid the waste affecting the movement of the blanking plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments of the present invention or the description of the prior art. 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.

[0009] Figure 1 It is a schematic diagram of the role of waste and products; Figure 2 is a schematic diagram of the overall structure of the ejection mechanism provided in some embodiments of the present application; Figure 3 This is a schematic diagram of the cooperation between the ejection mechanism, waste materials and products provided in some embodiments of the present application; Figure 4 This is a cross-sectional view of a portion of the ejection mechanism provided in some embodiments of the present application. Figure 1 ; Figure 5 This application is about Figure 4 Detailed view of point A; Figure 6 This is a schematic diagram of the cooperation between the lower mold, the blanking plate, and the bottom plate provided in some embodiments of the present application; Figure 7 It is a structural schematic diagram of a blanking plate provided in some embodiments of the present application; Figure 8 is a schematic diagram of the cooperation between the second push rod and the transmission assembly provided in some embodiments of the present application; Figure 9 is a schematic structural diagram of a cam provided in some embodiments of the present application; Figure 10 This is a cross-sectional view of a portion of the ejection mechanism provided in some embodiments of the present application. Figure 2 ; Figure 11This is a cross-sectional view of a portion of the ejection mechanism provided in some embodiments of the present application. Figure 3 ; Figure 12 This is a cross-sectional view of a portion of the ejection mechanism provided in some embodiments of the present application. Figure 4 ; Figure 13 This application is about Figure 12 Detail of point B; Figure 14 is a schematic diagram of the cooperation between the first push rod, the adjustment plate and the adjustment rod provided in some embodiments of the present application; Figure 15 This is a cross-sectional view of a portion of the ejection mechanism provided in some embodiments of the present application. Figure 5 .

[0010] In the figure: 110-upper mold, 120-lower mold, 121-adjusting groove, 130-mold cavity, 140-injection channel, 141-first sub-segment, 142-opening end, 200-buffer assembly, 210-buffer rod, 220-buffer spring, 310-first ejector rod, 320-second ejector rod, 321-first sub-rod, 322-second sub-rod, 330-blank plate, 331-connecting hole, 340-first protrusion, 350-second protrusion, 400-base, 500-bottom plate, 510-first movable cavity , 520-second active cavity, 530-third active cavity, 540-active channel, 550-fourth active cavity, 560-assembly groove, 600-support, 700-transmission assembly, 710-rotor, 720-cam, 721-protrusion, 722-sizing portion, 730-gear, 740-rack, 750-third protrusion, 810-adjustment plate, 820-first spring, 830-adjustment rod, 831-rod body, 832-sleeve, 833-second spring, 10-waste, 20-product. DETAILED DESCRIPTION

[0011] To make the objectives, technical solutions, and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other implementations obtained by those of ordinary skill in the art without inventive effort are within the scope of protection of the present invention.

[0012] In the prior art, after the waste is ejected from the mold, its position on the mold surface is uncertain. The position of the waste is different in different injection molding processes, and it is difficult to pick up the waste automatically. Therefore, manual picking of the waste is generally adopted.

[0013] The inventors have found that when the waste is ejected from the mold, it will be restricted by the inner wall of the pouring system. The waste will be squeezed and deformed while storing energy during the ejection process. After ejecting from the mold, the waste will rebound and collide with the product. Figure 1 As shown, Figure 1 In the figure, the thicker dashed line represents the scrap after rebound, the thinner dashed line represents the scrap's initial position during molding, and the solid line represents the scrap after deformation. The interaction between the two forces causes the scrap's position to change. Furthermore, after the part is moved out of the mold, its position is not fixed. The interaction between the part and the scrap is unstable, making its final position uncertain after the scrap collides with the part.

[0014] In view of this, the embodiment of the present application provides a multi-stage delayed ejection mechanism for an injection mold, referring to Figure 2 and Figure 3 As shown, it includes an upper mold 110, a lower mold 120 and a delayed ejection component.

[0015] The upper mold 110 and the lower mold 120 are the main structures of the injection mold. The upper mold 110 and the lower mold 120 are connected along a first direction to form a cavity 130 and an injection channel 140. The cavity 130 is part of the molding system, and the injection channel 140 is part of the pouring system. The melt is injected into the cavity 130 through the injection channel 140. Ultimately, the product 20 is molded in the cavity 130, and the melt in the injection channel 140 forms the waste 10. The injection channel 140 includes a first sub-segment 141 located in the lower mold 120. The axis of the first sub-segment 141 is inclined relative to the first direction and is connected to the cavity 130. The first sub-segment 141 is a part of the injection channel 140.

[0016] The delayed ejection assembly includes a first ejector pin 310, a second ejector pin 320, and a blanking plate 330, which are inserted into the lower mold 120 along a first direction from a side of the lower mold 120 away from the upper mold 110. The first ejector pin 310 can extend into the mold cavity 130 to eject the product 20 in the mold cavity 130 from the lower mold 120. The second ejector pin 320 can extend to the injection channel 140, and the first subsection 141 is located at the open end 142 of the lower mold 120 on the extension path of the second ejector pin 320 to smoothly eject the waste material 10 in the injection channel 140 from the lower mold 120. Figure 7 As shown, the blanking plate 330 is provided with a connecting hole 331, which can be connected to the first sub-section 141, so that the inner wall of the connecting hole 331 is flush with the inner wall of the first sub-section 141. Figure 6 As shown, the blanking plate 330 is prevented from affecting the normal injection molding process.

[0017] The first ejector pin 310, the second ejector pin 320 and the blanking plate 330 can be driven by external force to move toward the other side of the lower mold 120 in sequence, so that the product 20 in the cavity 130 and the waste 10 in the injection channel 140 are separated from the lower mold 120 in sequence, and the blanking plate 330 moves to the lower mold 120 and blocks between the product 20 and the waste 10.

[0018] The positions of the first ejector pin 310, the second ejector pin 320, and the blanking plate 330 relative to the lower mold 120 are adjustable. Before injection molding begins, the positions of the three elements, especially the first ejector pin 310 and the blanking plate 330, need to be adjusted so that the first ejector pin 310 is positioned exactly at the edge of the product 20 and the inner wall of the communicating hole 331 of the blanking plate 330 is flush with the inner wall of the first sub-segment 141. The three elements move in the direction of their insertion, i.e., the first direction.

[0019] The other side of the lower mold 120 is the side of the lower mold 120 closest to the upper mold 110. The first ejector pin 310, second ejector pin 320, and blanking plate 330 are sequentially pushed. The first ejector pin 310 first drives the product 20 in the cavity 130 toward the outside of the lower mold 120. At this point, the second ejector pin 320 is not activated, and the position of the waste material 10 remains unchanged, forcibly severing the connection between the waste material 10 and the product 20. The second ejector pin 320 then begins to move, pushing the waste material 10 toward the outside of the lower mold 120. After the waste material 10 exits the connection hole, it begins to push the blanking plate 330, allowing it to smoothly move toward the outside of the lower mold 120.

[0020] Under the push of the second push rod 320, part of the waste 10 corresponding to the first sub-section 141 is deformed under the restriction of the inner wall of the first sub-section 141 to move to the outside of the lower mold 120 along the first direction, and can be reset outside the lower mold 120, and collide with the blanking plate 330 during the reset process, and thus move to the waste recovery area in the direction away from the blanking plate 330 under the action of the collision.

[0021] Since the axis of the first sub-segment 141 is inclined relative to the first direction, when the second push rod 320 pushes the waste 10 along the first direction, the waste 10 in the first sub-segment 141 cannot maintain its overall structure and directly separate from the lower mold 120 along the first direction. This part of the waste 10 can only separate from the lower mold 120 from the open end 142 of the first sub-segment 141 at the lower mold 120. Therefore, this part of the waste 10 needs to be deformed before it can move outside the lower mold 120 along the first direction. After this part of the waste 10 moves to the outside of the lower mold 120, the restrictive effect of the inner wall of the first sub-section 141 on the waste 10 disappears, and the waste 10 begins to rebound and reset. During the reset process, the waste 10 will collide with the blanking plate 330 located between the waste 10 and the product 20. Under the action of the collision, the waste 10 is bounced away. A waste recovery point is set at the final stopping position of the waste 10. Then, the technical effect of automatically moving the waste 10 to the waste recovery point can be achieved in the process of ejecting the waste 10 from the lower mold 120, thereby realizing automatic recycling of the waste 10 and improving the recycling efficiency of the waste 10.

[0022] Furthermore, the blanking plate 330 is located between the waste material 10 and the product 20 , which can prevent the blanking plate 330 from colliding with the product 20 during rebound, thereby preventing the surface structure of the product 20 from being affected.

[0023] The positions of the blanking plate 330 and the lower mold 120 are stable, the collision between the blanking plate 330 and the waste 10 is stable, the force and direction of action on the blanking plate 330 are also stable, and the waste 10 can bounce back to the same area after colliding with the blanking plate 330.

[0024] It should be noted that, because the blanking plate 330 is provided with a connecting hole 331, it is necessary to pay attention to the distance that the blanking plate 330 extends from the lower mold 120 and the area where the blanking plate 330 collides with the waste material 10, so that the waste material 10 can avoid the connecting hole 331 and collide with the blanking plate 330. In addition, before injection molding, it is necessary to adjust the position of the second ejector pin 320 within the injection channel 140 so that when the second ejector pin 320 pushes the waste material 10 toward the outside of the lower mold 120, the end of the second ejector pin 320 and the waste material 10 in the first subsection 141 can simultaneously separate from the lower mold 120.

[0025] For example, please refer to Figure 4 As shown, the second push rod 320 is located below the open end 142 of the lower mold 120 of the first sub-segment 141. Waste 10 will also be formed between the second push rod 320 and the open end 142. The second push rod 320 pushes this part of the waste 10 to move, thereby ejecting the waste 10 as a whole from the lower mold 120. The waste 10 between the second push rod 320 and the open end 142 and the waste 10 in the first sub-segment 141 are separated from the lower mold 120 at the same time, thereby ensuring that under the push of the second push rod 320, the waste 10 as a whole can move stably until it is separated from the lower mold 120.

[0026] In some preferred embodiments of the present application, when the communicating hole 331 is connected to the first subsection 141 and the inner wall of the communicating hole 331 is flush with the inner wall of the first subsection 141, the end of the blanking plate 330 is flush with the surface of the lower mold 120 near the upper mold 110. This ensures that the blanking plate 330 can extend a sufficient distance from the lower mold 120 even when it is finally raised, ensuring that the waste 10 can collide with the blanking plate 330.

[0027] In some embodiments, the first push rod 310 , the second push rod 320 , and the blanking plate 330 may be connected to driving mechanisms respectively, and the driving mechanisms are activated in sequence to achieve the sequential movement of the first push rod 310 , the second push rod 320 , and the blanking plate 330 .

[0028] In other embodiments, the three components can be provided on the same component, and the connection between the component and the three components can be restricted, so that when the component is pushed, the three components can be pushed in sequence to move out of the lower mold 120 .

[0029] For example, please refer to Figure 2 and Figure 3 As shown, the ejection mechanism further includes a base 400 and a bottom plate 500. The lower mold 120 is fixed to the base 400 via a support member 600. The bottom plate 500 is installed between the base 400 and the lower mold 120, and the height of the support member 600 is greater than the thickness of the bottom plate 500. The gap between the base 400 and the lower mold 120 is greater than that of the bottom plate 500, and the bottom plate 500 can move between the base 400 and the lower mold 120 to change its position.

[0030] refer to Figure 4 As shown, the first push rod 310, the second push rod 320 and the blanking plate 330 are all plugged into the bottom plate 500, the first push rod 310 is fixed to the bottom plate 500, the second push rod 320 and the blanking plate 330 both pass through the bottom plate 500 and contact the base 400, the second push rod 320 and the blanking plate 330 are both movably cooperated with the bottom plate 500, and in the process of the bottom plate 500 moving toward the lower mold 120 under the action of external force, the moving distance of the bottom plate 500 relative to the second push rod 320 is smaller than the moving distance of the bottom plate 500 relative to the blanking plate 330, and the bottom plate 500 pushes the first push rod 310, the second push rod 320 and the blanking plate 330 to move in turn.

[0031] The first ejector pin 310 is fixed to the base plate 500. When the base plate 500 is pushed, the first ejector pin 310 is simultaneously pushed to move, ejecting the product 20 in the cavity 130 from the lower mold 120. The base plate 500 can move relative to the second ejector pin 320 and the blanking plate 330. The relative movement distance between the base plate 500 and the second ejector pin 320 and the blanking plate 330 is limited. When the relative movement distance between the base plate 500 and the second ejector pin 320 reaches the limit, the base plate 500 can drive both to move. The movement distance of the base plate 500 relative to the second ejector pin 320 is less than the movement distance of the base plate 500 relative to the blanking plate 330. As a result, during the movement of the base plate 500, the second ejector pin 320 is driven first, followed by the blanking plate 330.

[0032] In some embodiments, a top shaft is provided below the bottom plate 500 , and the top shaft rises to drive the bottom plate 500 to move. Meanwhile, a through hole for the top shaft to pass through is provided on the base 400 .

[0033] In some specific embodiments of this application, reference is made to Figure 5 As shown, a first protrusion 340 can be provided on the peripheral side wall of the blanking plate 330, and a first movable cavity 510 is provided in the bottom plate 500. The first protrusion 340 is movably provided in the first movable cavity 510 along the first direction. The first protrusion 340 can move in the first movable cavity 510. When the bottom plate 500 moves relative to the blanking plate 330, the first movable cavity 510 moves relative to the first protrusion 340 until the end of the first movable cavity 510 abuts against the first protrusion 340. The first movable cavity 510 can no longer move relative to the first protrusion 340, and the bottom plate 500 continues to move to drive the blanking plate 330 to move synchronously.

[0034] A second protrusion 350 is provided on the peripheral side wall of the second push rod 320, and a second movable cavity 520 is provided in the bottom plate 500. The second protrusion 350 is movably provided in the second movable cavity 520 along the first direction. The second protrusion 350 can move in the second movable cavity 520. When the bottom plate 500 moves relative to the second push rod 320, the second movable cavity 520 moves relative to the second protrusion 350 until the end of the second movable cavity 520 abuts against the second protrusion 350. The second movable cavity 520 can no longer move relative to the second protrusion 350, and the bottom plate 500 continues to move to drive the second push rod 320 to move synchronously.

[0035] When the base plate 500 moves toward the lower mold 120, the moving distance of the first active cavity 510 relative to the first protrusion 340 is greater than the moving distance of the second active cavity 520 relative to the second protrusion 350, thereby achieving the effect that the base plate 500 first pushes the second push rod 320 to move and then pushes the blanking plate 330 to move.

[0036] In some preferred embodiments of the present application, the ejection mechanism further includes a transmission assembly 700, and the second ejector rod 320 includes a first sub-rod 321 and a second sub-rod 322. Figure 8 As shown, one end of the first sub-rod 321 is inserted into the bottom plate 500, and the other end is located between the bottom plate 500 and the lower mold 120. One end of the second sub-rod 322 is inserted into the lower mold 120, and the other end is located between the lower mold 120 and the bottom plate 500. The transmission assembly 700 is connected between the bottom plate 500 and the junction of the first push rod 310 and the second push rod 320. The transmission assembly 700 is connected between the bottom plate 500 and the second push rod 320, and the location where it is connected to the second push rod 320 is the junction of the first sub-rod 321 and the second sub-rod 322 of the second push rod 320.

[0037] After the base plate 500 moves toward the lower mold 120 and pushes the first ejector pin 310, the transmission assembly 700, driven by the base plate 500, drives the second sub-rod 322 away from the lower mold 120, thereby separating the second sub-rod 322 from the waste material 10 within the injection channel 140. As the second sub-rod 322 moves away from the lower mold 120, the waste material 10 cannot move downward within the injection channel 140, thus separating the second sub-rod 322 and the waste material 10. When the waste material 10 is ejected from the lower mold 120 and collides with the blanking plate 330 before being ejected, the resistance exerted by the second ejector pin 320 on the waste material 10 is almost negligible, resulting in a more accurate prediction of the distance the waste material 10 can move and a higher probability of it being moved to a waste recycling area.

[0038] In some embodiments of this application, reference may be made to Figure 8 As shown, the transmission assembly 700 includes a rotating wheel 710, a cam 720, a gear 730, and a rack 740. The end of the first sub-rod 321 is connected to one of the rotating wheel 710 and the cam 720, and the end of the second sub-rod 322 is connected to the other of the rotating wheel 710 and the cam 720. Here, the ends of the first sub-rod 321 and the second sub-rod 322 refer to the ends located between the base plate 500 and the lower mold 120. The circumferential sidewalls of the cam 720 abut against the circumferential sidewalls of the rotating wheel 710, and the two drive each other, so that rotation of one drives rotation of the other. The gear 730 is mounted coaxially with the cam 720 or the rotating wheel 710 at the end of the first sub-rod 321, so that rotation of one drives coaxial rotation of the other. The rack 740 is mounted between the base plate 500 and the lower mold 120, and the gear 730 and the rack 740 are meshed and arranged to drive each other. The cam 720 includes a protrusion 721 and a sizing portion 722 arranged along its circumference. Along the circumference of the cam 720, the radius of the sizing portion 722 remains unchanged, and the radius of the protrusion 721 gradually decreases to the same radius as the sizing portion 722. Figure 9 shown.

[0039] When the bottom plate 500 is in contact with the base 400, the raised portion 721 of the cam 720 abuts against the rotating wheel 710. After the bottom plate 500 moves toward the lower mold 120 and pushes the first push rod 310, the bottom plate 500 can drive the gear 730 to rotate through the engagement of the rack 740 and the gear 730. The cam 720 or the rotating wheel 710 rotates synchronously with the gear 730, so that the part where the cam 720 abuts against the rotating wheel 710 is switched from the raised portion 721 to the sizing portion 722, so that the second sub-rod 322 moves toward the bottom plate 500.

[0040] When the base plate 500 moves toward the lower mold 120, it will push one of the rack 740 and the gear 730 to move, so that the gear 730 rotates relative to the rack 740, and the cam 720 or the wheel 710 synchronously connected to the gear 730 also rotates. The position where the cam 720 abuts the wheel 710 can be switched from the protrusion 721 to the sizing portion 722. The radius of the sizing portion 722 is smaller, and the second sub-rod 322 moves toward the base plate 500, thereby realizing the separation of the second sub-rod 322 and the waste 10.

[0041] In some embodiments, reference may be made to Figure 10 As shown, the base plate 500 is provided with a movable channel 540 passing through its two axial end surfaces, one end of the rack 740 is fixed to the lower mold 120, and the other end of the rack 740 is provided in the movable channel 540. In the process of the base plate 500 pushing the second push rod 320 to move toward the lower mold 120, the driving gear 730 rotates along the rack 740.

[0042] The upward movement of the base plate 500 can push the gear 730 to move upward. Since the gear 730 is meshed with the rack 740, as the gear 730 moves upward, the gear 730 rotates along the rack 740, thereby driving the rotating wheel 710 or cam 720 coaxially fixed with the gear 730 to rotate, driving the part where the cam 720 and the rotating wheel 710 abut against each other to switch from the protrusion 721 to the sizing part 722.

[0043] In other embodiments, reference Figure 11 As shown, one end of the rack 740 is movably inserted into the lower mold 120, and the other end is movably set on the bottom plate 500 and contacts the base 400, and the peripheral side wall of the rack 740 is provided with a third protrusion 750, and a third movable cavity 530 is provided in the bottom plate 500, and the third protrusion 750 is movably set in the third movable cavity 530. In the process of the bottom plate 500 moving toward the lower mold 120 under the action of external force, the moving distance of the bottom plate 500 relative to the second push rod 320 is greater than the moving distance of the third protrusion 750 in the third movable cavity 530, and the bottom plate 500 pushes the rack 740 and the second push rod 320 to move in turn, and the bottom plate 500 rotates by pushing the rack 740 to move.

[0044] As the base plate 500 ascends, the third protrusion 750 first abuts against the end of the third movable cavity 530, followed by the synchronous rise of the rack 740, which then moves upward, driving the gear 730 meshing with it to rotate, which in turn drives the gear 730 or the wheel 710 coaxially fixed to the gear 730. When the base plate 500 reaches its end point relative to the second push rod 320, the base plate 500 pushes the second push rod 320 to move.

[0045] The first ejector pin 310 is used to eject the product 20 from the lower mold 120. The number of the first ejector pins 310 is generally not less than two, which makes it easier to eject the product 20 from the lower mold 120. Figure 12 and Figure 13 As shown, a fourth movable cavity 550 is provided in the base plate 500, and an adjustment groove 121 is provided on the surface of the lower mold 120 close to the base plate 500. An adjustment plate 810 and a first spring 820 are movably installed inside the fourth movable cavity 550. The first spring 820 is located on the side of the adjustment plate 810 away from the lower mold 120. An adjustment rod 830 is fixed to the adjustment plate 810, and the other end of the adjustment rod 830 is inserted into the adjustment groove 121, and one of the first push rods 310 is fixedly connected to the adjustment plate 810.

[0046] During the process of the base plate 500 pushing the first push rod 310 to move toward the lower mold 120, the adjusting rod 830 moves in the adjusting groove 121 until it abuts against the bottom of the adjusting groove 121, and the adjusting rod 830 cannot continue to move upward. As the base plate 500 continues to move upward, the adjusting rod 830 begins to compress the first spring 820, thereby driving the adjusting plate 810 and the first push rod 310 fixed to the adjusting plate 810 to move in a direction away from the product 20 in the cavity 130, so that the first push rod 310 is separated from the product 20.

[0047] After the adjustment rod 830 abuts the bottom of the adjustment slot 121, the adjustment rod 830 cannot move further upward. The other end of the adjustment rod 830 is connected to the adjustment plate 810. The adjustment plate 810 and the first push rod 310 fixed to the adjustment plate 810 cannot move further upward. However, since the first spring 820 is provided below the adjustment plate 810, the first spring 820 can be compressed to achieve the continued rise of the bottom plate 500. The other push rods fixed to the bottom plate 500 also continue to rise, lifting the product 20. With the product 20 as a reference, the adjustment plate 810 and the first push rod 310 fixed to the adjustment plate 810 move in a direction away from the product 20.

[0048] It should be noted that after the first spring 820 is compressed to the limit position, the base plate 500 will not be able to continue to rise. Therefore, it is necessary to pay attention to the compressibility of the first spring 820 to ensure that when the first spring 820 is compressed to the limit position, the product 20 has been ejected from the lower mold 120.

[0049] Since one of the first push rods 310 is separated from the product 20, after the product 20 is separated from the lower mold 120, the remaining first push rod 310 has poor support stability for the product 20, and the product 20 is easily tilted and falls directly under the action of its own gravity, thereby achieving the separation of the product 20 from the remaining first push rod 310.

[0050] In some preferred embodiments, reference Figure 13 and Figure 14 As shown, the adjustment rod 830 includes a rod body 831, a sleeve 832, and a second spring 833. One end of the rod body 831 is fixedly connected to the adjustment plate 810, and the sleeve 832 is sleeved outside the other end of the rod body 831 and inserted into the adjustment slot 121. The second spring 833 is sleeved outside the rod body 831 and is pressed tightly between the adjustment plate 810 and the end of the sleeve 832. There is a gap between the end of the sleeve 832 and the end of the rod body 831. After the sleeve 832 abuts the bottom of the adjustment slot 121, as the base plate 500 continues to move upward, the sleeve 832 can compress the second spring 833, thereby providing a buffering effect.

[0051] In some embodiments of the present application, at least one set of buffer components 200 is further provided between the lower mold 120 and the bottom plate 500. Figure 15 As shown, the buffer assembly 200 includes a buffer rod 210 and a buffer spring 220. The buffer rod 210 is fixedly mounted on the base 400 or the bottom plate 500 and is movably inserted into the lower mold 120. The buffer spring 220 is sleeved outside the buffer rod 210 and is pressed tightly between the lower mold 120 and the bottom plate 500. The buffer assembly 200 has a buffering effect and prevents the bottom plate 500 from directly colliding with the lower mold 120.

[0052] In some embodiments, the base plate 500 is provided with an assembly groove 560, and the support member 600 is disposed in the assembly groove 560, with the peripheral sidewall of the support member 600 contacting and engaging with the inner wall of the assembly groove 560. The support member 600, fixed between the base 400 and the lower mold 120, can guide the movement of the base plate 500, so that the base plate 500 moves toward or away from the lower mold 120 in a predetermined first direction.

[0053] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus 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 apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0054] Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of the present application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in reverse order depending on the functions involved. For example, the methods described may be performed in an order different from that described, and various steps may be added, omitted, or combined. Furthermore, features described with reference to certain examples may be combined in other examples.

[0055] The above description is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field can easily think of changes or replacements within the technical scope disclosed by the present invention, which should be covered by the scope of protection of the present invention.

Claims

1. A multi-stage delayed ejection mechanism for an injection mold, characterized in that: The mold comprises an upper mold, a lower mold, and a delayed ejection assembly, wherein the upper mold and the lower mold are butted together along a first direction to form a mold cavity and an injection channel, wherein the injection channel comprises a first subsection located in the lower mold, wherein the axis of the first subsection is inclined relative to the first direction and communicates with the mold cavity; The delayed ejection assembly includes a first ejector pin, a second ejector pin, and a blanking plate, which are inserted into the lower mold along a first direction from a side of the lower mold away from the upper mold, the first ejector pin can extend to the mold cavity, the second ejector pin can extend to the injection channel, and the first sub-segment is located on the extension path of the second ejector pin at the open end of the lower mold. The blanking plate is provided with a communicating hole, which can be communicated with the first sub-segment, so that the inner wall of the communicating hole is flush with the inner wall of the first sub-segment; The first ejector rod, the second ejector rod, and the blanking plate are capable of being sequentially moved toward the other side of the lower mold under the driving force of an external force, so that the product in the cavity and the waste material in the injection channel are sequentially separated from the lower mold, and the blanking plate is moved to the outside of the lower mold and blocked between the product and the waste material; Under the push of the second push rod, part of the waste corresponding to the first sub-segment is deformed under the restriction of the inner wall of the first sub-segment to move to the outside of the lower mold along the first direction, and can be reset outside the lower mold, and collide with the blanking plate during the reset process, and thus move away from the blanking plate to the waste recovery area under the action of the collision.

2. A multi-stage delayed ejection mechanism for an injection mold according to claim 1, characterized in that: The ejection mechanism further includes a base and a bottom plate, the lower mold is fixed to the base through a support member, the bottom plate is installed between the base and the lower mold, and the height of the support member is greater than the thickness of the bottom plate; The first push rod, the second push rod and the blanking plate are all inserted into the bottom plate, the first push rod is fixed to the bottom plate, the second push rod and the blanking plate pass through the bottom plate and contact the base, the second push rod and the blanking plate are movably cooperated with the bottom plate, and in the process of the bottom plate moving toward the lower mold under the action of external force, the moving distance of the bottom plate relative to the second push rod is smaller than the moving distance of the bottom plate relative to the blanking plate, and the bottom plate pushes the first push rod, the second push rod and the blanking plate to move in turn.

3. The multi-stage delayed ejection mechanism for an injection mold according to claim 2, characterized in that: A first protrusion is provided on the peripheral side wall of the blanking plate, a first movable cavity is provided in the bottom plate, the first protrusion is movably provided in the first movable cavity along a first direction, a second protrusion is provided on the peripheral side wall of the second push rod, a second movable cavity is provided in the bottom plate, and the second protrusion is movably provided in the second movable cavity along the first direction.

4. The multi-stage delayed ejection mechanism for an injection mold according to claim 2, characterized in that: The ejection mechanism further includes a transmission assembly, the second ejector rod includes a first sub-rod and a second sub-rod, one end of the first sub-rod is inserted into the bottom plate, and the other end is located between the bottom plate and the lower mold, one end of the second sub-rod is inserted into the lower mold, and the other end is located between the lower mold and the bottom plate, and the transmission assembly is connected between the bottom plate and the connecting position of the first ejector rod and the second ejector rod; After the bottom plate moves toward the lower mold and pushes the first push rod, the transmission assembly can drive the second sub-rod to move away from the lower mold under the push of the bottom plate, thereby separating the second sub-rod from the waste in the injection channel.

5. The multi-stage delayed ejection mechanism for an injection mold according to claim 4, characterized in that: The transmission assembly includes a rotating wheel, a cam, a gear and a rack; The end of the first sub-rod is connected to one of the rotating wheel and the cam, the end of the second sub-rod is connected to the other of the rotating wheel and the cam, the peripheral side wall of the cam is in abutment with the peripheral side wall of the rotating wheel, the gear is coaxially fixed with the cam or the rotating wheel mounted on the end of the first sub-rod, the rack is mounted between the base plate and the lower mold, and the gear is meshed with the rack; The cam includes a raised portion and a sizing portion arranged along its circumference, wherein the radius of the sizing portion remains constant along the circumference of the cam, and the radius of the raised portion gradually decreases to be the same as the radius of the sizing portion; When the bottom plate is in contact with the base, the raised portion of the cam abuts against the rotary wheel. After the bottom plate moves toward the lower mold and pushes the first push rod, the bottom plate can drive the gear to rotate through the engagement of the rack and the gear. The cam or the rotary wheel rotates synchronously with the gear, so that the part where the cam abuts against the rotary wheel is switched from the raised portion to the sizing portion, so that the second sub-rod moves toward the bottom plate.

6. The multi-stage delayed ejection mechanism for an injection mold according to claim 5, characterized in that: The bottom plate is provided with movable channels running through both axial end surfaces thereof, one end of the rack is fixed to the lower die, and the other end of the rack is movably provided in the movable channel; when the bottom plate pushes the second push rod toward the lower die, the gear is driven to rotate along the rack; Or one end of the rack is movably inserted into the lower mold, and the other end is movably set on the bottom plate, the peripheral side wall of the rack is provided with a third protrusion, and a third movable cavity is provided in the bottom plate, and the third protrusion is movably set in the third movable cavity. In the process of the bottom plate moving toward the lower mold under the action of external force, the moving distance of the bottom plate relative to the second push rod is greater than the moving distance of the third protrusion in the third movable cavity, and the bottom plate pushes the rack and the second push rod to move in turn, and the bottom plate causes the gear to rotate by pushing the rack to move.

7. The multi-stage delayed ejection mechanism for an injection mold according to claim 2, characterized in that: There are at least two first push rods, a fourth movable cavity is provided inside the base plate, an adjustment groove is provided on the surface of the lower mold close to the base plate, an adjustment plate and a first spring are movably installed inside the fourth movable cavity, the first spring is located on a side of the adjustment plate away from the lower mold, an adjustment rod is fixed to the adjustment plate, the other end of the adjustment rod is inserted into the adjustment groove, and one of the first push rods is fixedly connected to the adjustment plate; In the process of the base plate pushing the first push rod to move toward the lower mold, the adjustment rod moves in the adjustment groove until it abuts against the bottom of the adjustment groove, and the adjustment rod compresses the first spring, thereby causing the adjustment plate and the first push rod fixed to the adjustment plate to move in a direction away from the product in the cavity, so that the first push rod is separated from the product.

8. The multi-stage delayed ejection mechanism for an injection mold according to claim 7, characterized in that: The adjusting rod includes a rod body, a sleeve and a second spring. One end of the rod body is fixedly connected to the adjusting plate. The sleeve is sleeved outside the other end of the rod body and inserted into the adjusting groove. The second spring is sleeved outside the rod body, and the second spring is pressed between the adjusting plate and the end of the sleeve. There is a gap between the end of the sleeve and the end of the rod body.

9. The multi-stage delayed ejection mechanism for an injection mold according to claim 2, characterized in that: At least one buffer assembly is further provided between the lower die and the base plate, the buffer assembly comprising a buffer rod and a buffer spring, the buffer rod being fixedly mounted on the base plate or the pedestal and movably plugged into the lower die, the buffer spring being sleeved outside the buffer rod and pressed tightly between the lower die and the base plate; And / or, the bottom plate is provided with an assembly groove, the support member is passed through the assembly groove, and the peripheral side wall of the support member is in contact with and fits with the inner wall of the assembly groove.

10. The multi-stage delayed ejection mechanism for an injection mold according to claim 1, characterized in that: When the communicating hole is connected to the first subsection and the inner wall of the communicating hole is flush with the inner wall of the first subsection, the end of the blanking plate is flush with the surface of the lower mold close to the upper mold.

Images