Gate cut-off mechanism in a mold

Abstract

The application provides a gate cutting mechanism in a mold, which comprises a cutter assembly, a power assembly and an inductive switch. The cutter assembly comprises a cutter, which is slidably connected to a lower mold. One end of the cutter extends to a predetermined position, so that the cutter cuts off the gate. The power assembly comprises a driving member, a piston rod of the driving member being connected to the other end of the cutter, and a power end of the driving member being connected to a power source of an injection molding machine. The inductive switch is used for controlling the start and stop of the gate cutting mechanism in the mold. The gate cutting mechanism in the mold is controlled and driven by the original control system and power system of the injection molding machine to realize the cutting of the gate in the mold, so that the efficiency is improved and the quality is ensured without secondary processing.

Description

Technical Field

[0001] This application relates to the technical field of injection molds, and in particular to a gate cutting mechanism within a mold. Background Technology

[0002] In injection molding, the gate serves as a crucial channel for molten plastic to enter the mold cavity, and its removal is an indispensable post-processing step. Traditional gate removal methods mainly rely on two types of techniques: manual removal. Manual removal is typically performed by operators using simple tools such as pliers and blades based on experience. This method is inefficient, labor-intensive, and produces highly inconsistent removal quality, easily resulting in residues, cuts to the product, or obvious marks, making it difficult to guarantee the consistency of batch products.

[0003] To address the aforementioned issues, existing technologies typically employ specialized equipment for mechanical punching, which uses mechanical force to break off the gate in a single operation. This requires moving the product from the mold to the equipment for positioning, resulting in secondary positioning errors and making it difficult to ensure precise alignment with the punching die, thus affecting the cutting quality. Utility Model Content

[0004] The purpose of this application is to overcome the shortcomings of the prior art and provide a gate removal mechanism in a mold with high gate removal efficiency and stable removal quality.

[0005] The objective of this application is achieved through the following technical solution:

[0006] A gate cutting mechanism within a mold, disposed in the lower mold, comprises:

[0007] A cutting assembly, the cutting assembly including a cutting blade, the cutting blade being slidably connected to the lower mold, one end of the cutting blade extending out of the lower mold to a predetermined position, so as to cut off the gate;

[0008] A power assembly is disposed below the cutter assembly. The power assembly includes a drive component, the piston rod of which is connected to the other end of the cutter, and the power end of the drive component is connected to the power source of the injection molding machine.

[0009] A proximity switch is disposed on the side wall of the lower mold. The proximity switch is used to control the start and stop of the gate cutting mechanism in the mold. The control terminal of the proximity switch is electrically connected to the control system of the injection molding machine.

[0010] In one embodiment, the driving component is a hydraulic driving component, and the power assembly further includes hydraulic pipelines, with both ends of the hydraulic pipelines connected to the power end of the hydraulic driving component and the power source of the injection molding machine, respectively.

[0011] In one embodiment, the power assembly further includes a hydraulic connector disposed at one end of the hydraulic line, the hydraulic connector being used to connect to the power source of the injection molding machine.

[0012] In one embodiment, the cutter assembly further includes a mounting plate slidably disposed within the lower mold, the mounting plate having a mounting groove, the end of the cutter near the drive member being located within the mounting groove, and the piston rod of the drive member being connected to the side of the mounting plate opposite to the cutter.

[0013] In one embodiment, a fixing block is formed on the side wall of the mounting groove, and a fixing groove is provided at one end of the cutter near the drive member. The fixing block is located in the fixing groove so that the cutter is connected to the mounting plate.

[0014] In one embodiment, the cutter assembly further includes a positioning post, which is slidably disposed within the lower mold. One end of the positioning post has a positioning flange, and both ends of the positioning flange abut against the mounting plate and the lower mold, respectively.

[0015] In one embodiment, the cutting blade assembly further includes a limiting member, and the mounting plate has clearance grooves on both sides. One end of the limiting member is located in the limiting hole of the lower mold, and the other end of the limiting member is located in the clearance groove and movably abuts against the inner wall of the clearance groove.

[0016] In one embodiment, the cutter assembly further includes an elastic element, and the mounting plate has a receiving hole on the side opposite to the drive member. The elastic element is received in the receiving hole, and the two ends of the elastic element abut against the bottom of the receiving hole and the lower mold, respectively.

[0017] In one embodiment, the cutter includes a blade body and a handle connected together, with a transition slope formed between the handle and the blade body.

[0018] In one embodiment, the cutter has a shearing bevel and a stepped plane, both of which are located at the end of the cutter away from the drive member. The shearing bevel is disposed away from the cavity of the lower mold, and the stepped plane is located at the bottom of the shearing bevel. The stepped plane is used to be flush with the inner wall of the cavity when the cutter body extends to a predetermined position.

[0019] Compared with the prior art, this application has at least the following advantages:

[0020] 1. The gate cutting mechanism in the mold described above drives the cutter to extend to a predetermined position through the drive component of the power assembly to cut off the gate. No secondary processing of the product is required, which ensures the cutting accuracy and improves the processing efficiency.

[0021] 2. The induction switch of the gate cutting mechanism in the mold is electrically connected to the control system of the injection molding machine. The control system of the injection molded part controls the start and stop of the gate cutting mechanism in the mold, so that it performs the cutting action in accordance with the production rhythm of the injection molding machine, avoiding product sticking to the cutter and causing product deformation, and preventing the product from colliding with the cutter and damaging the cutter and the product.

[0022] 3. The power end of the drive component of the gate cutting mechanism in the mold is connected to the power source of the injection molding machine. That is, the gate cutting mechanism in the mold shares the power source with the injection molding machine, without the need to introduce a new power system, which simplifies the overall structure and facilitates control. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the gate cutting mechanism inside a mold according to one embodiment;

[0025] Figure 2 for Figure 1 A schematic diagram of the gate cutting mechanism inside the mold in another state;

[0026] Figure 3 for Figure 2 A cross-sectional view of the gate cutting mechanism inside the mold shown;

[0027] Figure 4 for Figure 3 A partial enlarged view of the gate cutting mechanism B inside the mold shown;

[0028] Figure 5 for Figure 3 A cross-sectional view of the gate cutting mechanism in the mold shown in the AA direction;

[0029] Figure 6 for Figure 5 A partial enlarged view of the gate cutting mechanism C inside the mold shown;

[0030] Figure 7 for Figure 1 A schematic diagram of the mounting plate of the gate cutting mechanism inside the mold shown;

[0031] Figure 8 for Figure 1 A schematic diagram of the cutter structure of the gate removal mechanism inside the mold shown;

[0032] Figure 9 This is a schematic diagram of the gate cutting mechanism in a mold according to one embodiment. Detailed Implementation

[0033] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings. Preferred embodiments of this application are shown in the drawings. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this application.

[0034] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0036] To better understand the technical solution and beneficial effects of this application, the following detailed description is provided in conjunction with specific embodiments:

[0037] Please see Figures 1 to 9This invention relates to a gate cutting mechanism 10 within a mold, as described in one embodiment of the present invention. The gate cutting mechanism 10 is disposed within the lower mold 20 and includes a cutter assembly 100, a power assembly 200, and a sensor switch 300. The cutter assembly 100 includes a cutter 110, which is slidably connected to the lower mold 20. One end of the cutter 110 extends to a predetermined position to cut off the gate. The power assembly 200 is disposed below the cutter assembly 100 and includes a drive member 210. The piston rod of the drive member 210 is connected to the other end of the cutter 110, and the power end of the drive member 210 is connected to the power source of the injection molding machine. The sensor switch 300 is disposed on the side wall of the lower mold 20 and is used to control the start and stop of the gate cutting mechanism 10 within the mold. The control end of the sensor switch 300 is electrically connected to the control system of the injection molding machine.

[0038] It should be noted that the lower mold 20 has a cutter groove 21 and a fixing through hole 22. The cutter 110 is located in the cutter groove 21 and slides along the cutter groove 21. The driving component is located in the fixing through hole 22.

[0039] In this embodiment, the gate cutting mechanism 10 within the mold is driven by the drive component 210 of the power assembly 200 to extend the cutter 110 to a predetermined position, cutting off the gate. This eliminates the need for secondary processing of the product 30, ensuring both cutting accuracy and improved processing efficiency. Furthermore, the inductive switch 300 of the gate cutting mechanism 10 within the mold is electrically connected to the injection molding machine's control system. The control system controls the start and stop of the gate cutting mechanism 10, ensuring it operates in sync with the injection molding machine's production cycle. This prevents the product 30 from sticking to the cutter 110, causing deformation, and also prevents collisions between the product 30 and the cutter 110 that could damage both. Simultaneously, the drive component 210 is fixed via the fixing through hole 23 in the lower mold 20, eliminating the need for external connectors and simplifying the overall structure. In addition, the power end of the drive component 210 of the gate cutting mechanism 10 in the mold is connected to the power source of the injection molding machine. That is, the drive component 210 of the gate cutting mechanism 10 in the mold shares the power source with the injection molding machine. There is no need to introduce a new power system, which simplifies the overall structure and makes it easier to control.

[0040] like Figure 1 , Figure 2 and Figure 9As shown, in one embodiment, the drive component 210 is a hydraulic drive component, and the power assembly 200 also includes a hydraulic pipeline 220. The two ends of the hydraulic pipeline 220 are respectively connected to the power end of the drive component 210 and the power source of the injection molding machine. The two ends of the hydraulic pipeline 220 are connected to the oil port of the hydraulic drive component and the power source of the injection molding machine. It can be understood that the hydraulic drive component 210 shares the hydraulic control equipment with the injection molding machine, eliminating the need for an additional power system and simplifying the overall structure. Simultaneously, the hydraulic drive component 210 is controlled by the injection molding machine's hydraulic control system, facilitating the gate cutting mechanism 10 within the mold to perform the cutting action in coordination with the production cycle of the injection molding machine, ensuring the quality of the gate cutting.

[0041] like Figure 1 , Figure 2 and Figure 5 As shown, in one embodiment, the power assembly 200 further includes a hydraulic connector 230, which is disposed at one end of the hydraulic line 220 and is used to connect to the power source of the injection molding machine. Providing a hydraulic connector 230 at the end of the hydraulic line 220 facilitates quick connection to the external pipeline of the injection molding machine's power source, enhances the adaptability and maintenance convenience of the gate cutting mechanism 10 within the mold, reduces the risk of leakage, and ensures the long-term stable operation of the gate cutting mechanism 10 within the mold.

[0042] like Figure 1 , Figure 2 and Figure 5 As shown, in one embodiment, the hydraulic pipeline 220 is disposed within the base plate 23 of the lower mold 20. The base plate 23 has a connection hole 23a corresponding to the oil port of the hydraulic cylinder. The hydraulic pipeline 220 extends to the periphery of the base plate 23 to form an end hole (not shown). The hydraulic connector 230 is disposed on one of the end holes, and the remaining end holes are sealed with plugs 221. By integrating the hydraulic pipeline 220 into the base plate 23, the gate cutting mechanism 10 within the mold has a more compact overall structure, avoiding interference from the external hydraulic pipeline 220 with the operation of the gate cutting mechanism 10 within the mold. At the same time, the plugs 221 seal the end holes to prevent hydraulic oil leakage and ensure the pressure stability of the hydraulic drive component 210.

[0043] Furthermore, such as Figure 1 As shown, in other embodiments, the mold is equipped with three sets of cutting blade assemblies 100 and three sets of power assemblies 200, and there is one hydraulic connector 230. The power ends of the drive components 210 of the three sets of power assemblies 200 are all connected to the branches of the hydraulic pipeline 200. The multiple branches intersect with each other and finally converge on the main road connected to the hydraulic connector 230. The power source of the injection molding machine is connected through a single hydraulic connector 230. That is, a single hydraulic connector 230 can supply power to multiple sets of power assemblies 200, simplifying the overall structure and facilitating control.

[0044] like Figure 3 and Figure 7 As shown, in one embodiment, the cutter assembly 100 further includes a mounting plate 120, which is slidably disposed within the receiving groove 24 of the lower mold 20. The mounting plate 120 has a mounting groove 121, and the end of the cutter 110 near the drive member 210 is located within the mounting groove 121, allowing the cutter 110 to connect with the mounting plate 120. The piston rod of the drive member 210 is connected to the side of the mounting plate 120 opposite to the cutter 110. It is understood that the cutter 110 can slide along the mounting groove 121, facilitating adjustment of the relative position of the cutter 110 and the mounting plate 120 according to actual needs, thus improving the adaptability of the mounting plate 120. Simultaneously, the mounting plate 120 enhances the overall rigidity and motion stability of the cutter assembly 100, ensuring the quality and consistency of gate removal. The receiving groove 24 communicates with the cutter return groove 21.

[0045] Furthermore, such as Figure 1 As shown, in this embodiment, a mounting plate 120 is provided with two driving members 210. The two driving members 210 are symmetrically arranged on both sides of the mounting plate 120 to ensure uniform distribution of thrust, prevent the mounting plate 120 and the cutter 110 from tilting or jamming, enhance the stability of the cutter 110's movement, and ensure the quality of gate removal. At the same time, it reduces the load on a single driving member 210 and extends its service life.

[0046] like Figure 3 and Figure 7 As shown, in one embodiment, a fixing block 1211 is formed on the sidewall of the mounting groove 121. A fixing groove 1101 is formed at the end of the cutter 110 near the drive member 210. The fixing block 1211 is located in the fixing groove 1101 so that the cutter 110 is connected to the mounting plate 120. It can be understood that the overall stability of the connection is enhanced by the snap-fit ​​cooperation between the fixing block 1211 and the fixing groove 1101, preventing the cutter 110 from coming out of the mounting plate 120 during use, while simplifying the assembly of the cutter assembly 100.

[0047] like Figures 4 to 6 As shown, in one embodiment, the cutter assembly 100 further includes a positioning post 130, which is slidably disposed within the auxiliary hole 24a of the lower mold 20. One end of the positioning post 130 has a positioning flange 131, and both ends of the positioning flange 131 abut against the inner walls of the mounting plate 120 and the positioning groove 24b of the lower mold 20, respectively. For details, please refer to... Figure 1In one embodiment, there are two positioning pins 130, located on opposite sides of the mounting plate 120. These positioning pins 130 limit the travel of the mounting plate 130, preventing the cutter 110 from overextending and improving the safety of the gate cutting mechanism 10 within the mold. Simultaneously, during the reset process, the positioning pins 130 protruding from the surface of the lower mold 20 are pressed back to their initial positions, ensuring that the mounting plate 120 and the cutter 110 accurately return to their initial positions.

[0048] The receiving groove 24 is located at the bottom of the retracting groove 21. The auxiliary hole 24a of the lower die 20 is opened on the inner wall of the receiving groove 24 and is parallel to the retracting groove 21. The positioning groove 24b of the lower die 20 is set along the periphery of the end of the auxiliary hole 24a near the drive member 210.

[0049] like Figure 1 , Figure 3 and Figure 7 As shown, in one embodiment, the cutter assembly 100 further includes a limiting member 140. The mounting plate 120 has clearance grooves 122 on both sides. One end of the limiting member 140 is located within the limiting hole 25 of the lower mold 20, and a portion of the other end of the limiting member 140 is located within the clearance groove 122 of the lower mold 20 and movably abuts against the inner wall of the clearance groove 122. In this embodiment, the other end of the limiting member 140 forms a limiting flange 141, a portion of which is located within the clearance groove 122. The limiting flange 141 abuts against the inner wall of the clearance groove 122, preventing the mounting plate 120 from retracting. This ensures that the cutter 110 accurately reaches its initial and predetermined positions each time it cuts, thereby avoiding gate residue, improving the gate removal quality, and enhancing the stability of the gate removal mechanism 10 within the mold.

[0050] like Figure 6 and Figure 7 As shown, in one embodiment, the cutter assembly 100 further includes an elastic element 150. A receiving hole 123 is provided on the side of the mounting plate 120 facing away from the drive member 210. The elastic element 150 is housed within the receiving hole 123, with its two ends abutting against the bottom of the receiving hole 123 and the lower mold 20, respectively. Specifically, the piston rod of the drive member 210 extends, and the mounting plate 120 abuts against the inner wall of the receiving groove 24 of the lower mold 20, causing the elastic element 150 to compress and store compressive potential energy. After the cut is completed, the drive member 210 retracts, the mounting plate 120 moves away from the receiving groove 24, and the elastic element 150 releases its elastic potential energy, pushing the mounting plate 120 away from the receiving groove 120, allowing the mounting plate 120 to quickly reset. This ensures that the mounting plate 120 is in the same position before each cycle, thereby guaranteeing the quality of the gate cut and improving the reliability of the gate cut mechanism 10 within the mold. Furthermore, in this embodiment, the elastic element 150 is a spring. In other embodiments, the elastic element 150 may also be a polyurethane block, a rubber elastomer, or other element that can provide elastic restoring force.

[0051] like Figure 4 and Figure 8 As shown, in one embodiment, the cutter 110 includes a blade body 111 and a handle 112 connected together, with a transition slope 113 formed between the handle 112 and the blade body 111. It is understood that the thickness of the handle 112 is greater than that of the blade body 111, and the transition slope 113 between the handle 112 and the blade body 111 avoids stress concentration and extends the lifespan of the cutter 110.

[0052] It should be noted that, as Figure 4 As shown, in one embodiment, the lower mold 20's cutter groove 21 includes a first cutter groove 21a and a second cutter groove 21b. The cutter body 111 is located within the first cutter groove 21a, and the first cutter groove 21a conforms to the contour of the cutter body 111. The cutter handle 112 and the transition slope 113 are located within the second cutter groove 21b. It is understood that the first cutter groove 21a conforms to the contour of the cutter body 111 to prevent the cutter body 111 from shaking during use, thus improving the quality and consistency of gate removal. Simultaneously, there is a gap between the cutter handle 112 and the groove wall of the second cutter groove 21b, meaning that the outer surface of the cutter handle 112 does not contact the groove wall of the second cutter groove 21b. This reduces the running resistance of the cutter 110, allowing the cutter 110 to run smoothly.

[0053] like Figure 8 As shown, in one embodiment, the blade body 111 has a shearing bevel 1111 and a stepped plane 1112. The shearing bevel 1111 and the stepped plane 1112 are located at the end of the blade body 111 away from the drive member 120. The shearing bevel 1111 is disposed away from the cavity 26 of the lower mold 20. The stepped plane 1112 is located at the bottom of the shearing bevel 1111 and is used to be flush with the inner wall of the cavity 25 when the cutter 110 extends to a predetermined position. It can be understood that the cutter 110 achieves progressive shearing through the shearing bevel 1111, preventing product 30 from deforming and extending the service life of the cutter 110. At the same time, the stepped plane 1112 is located on one side of the cavity, and both the vertical plane of the cutter 110 facing the cavity 25 and the stepped plane 112 are flush with the inner wall of the cavity 26, together serving as support and sealing. This ensures that the surface of product 30 is free of indentations and flash, and that the gate position is flat, thereby improving the quality of gate removal and the quality of product 30.

[0054] Compared with the prior art, this application has at least the following advantages:

[0055] 1. The gate cutting mechanism in the mold described above drives the cutter to extend to a predetermined position through the drive component of the power assembly to cut off the gate. No secondary processing of the product is required, which ensures the cutting accuracy and improves the processing efficiency.

[0056] 2. The induction switch of the gate cutting mechanism in the mold is electrically connected to the control system of the injection molding machine. The control system of the injection molded part controls the gate cutting mechanism in the mold to perform the cutting action in accordance with the production rhythm of the injection molding machine, so as to avoid the product sticking to the cutter and causing product deformation, and to prevent the product from colliding with the cutter and damaging the cutter and the product.

[0057] 3. The power end of the drive component of the gate cutting mechanism in the mold is connected to the power source of the injection molding machine. That is, the gate cutting mechanism in the mold shares the power source with the injection molding machine, without the need to introduce a new power system, which simplifies the overall structure and facilitates control.

[0058] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the disclosed patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A gate cutting mechanism for a mold, disposed within the lower mold, characterized in that, include: A cutting assembly, comprising a cutting blade slidably connected to the lower mold, one end of the cutting blade extending out of the lower mold to a predetermined position to cut off the gate; A power assembly is disposed below the cutter assembly. The power assembly includes a drive component, the piston rod of which is connected to the other end of the cutter, and the power end of the drive component is connected to the power source of the injection molding machine. A proximity switch is disposed on the side wall of the lower mold. The proximity switch is used to control the start and stop of the gate cutting mechanism in the mold. The control terminal of the proximity switch is electrically connected to the control system of the injection molding machine.

2. The gate cutting mechanism within the mold according to claim 1, characterized in that, The driving component is a hydraulic driving component, and the power assembly also includes a hydraulic pipeline, the two ends of which are respectively connected to the power end of the driving component and the power source of the injection molding machine.

3. The gate cutting mechanism within the mold according to claim 2, characterized in that, The power assembly also includes a hydraulic connector, which is located at one end of the hydraulic pipeline and is used to connect to the power source of the injection molding machine.

4. The gate cutting mechanism within the mold according to claim 1, characterized in that, The cutter assembly also includes a mounting plate, which is slidably disposed within the lower mold. The mounting plate has a mounting groove, and the end of the cutter near the drive member is located within the mounting groove. The piston rod of the drive member is connected to the side of the mounting plate opposite to the cutter.

5. The gate cutting mechanism within the mold according to claim 4, characterized in that, A fixing block is formed on the side wall of the mounting groove, and a fixing groove is opened at the end of the cutter near the drive member. The fixing block is located in the fixing groove so that the cutter is connected to the mounting plate.

6. The gate cutting mechanism within the mold according to claim 4, characterized in that, The cutting assembly also includes a positioning post, which is slidably disposed within the lower mold. One end of the positioning post has a positioning flange, and the two ends of the positioning flange abut against the mounting plate and the lower mold, respectively.

7. The gate cutting mechanism within the mold according to claim 4, characterized in that, The cutting blade assembly also includes a limiting member. The mounting plate has clearance grooves on both sides. One end of the limiting member is located in the limiting hole of the lower mold, and the other end of the limiting member is located in the clearance groove and moves against the inner wall of the clearance groove.

8. The gate cutting mechanism within the mold according to claim 4, characterized in that, The cutting assembly also includes an elastic element. The mounting plate has a receiving hole on the side facing away from the driving element. The elastic element is housed in the receiving hole, and its two ends abut against the bottom of the receiving hole and the lower mold, respectively.

9. The gate cutting mechanism within the mold according to claim 1, characterized in that, The cutter includes a blade body and a handle connected together, with a transition slope formed between the handle and the blade body.

10. The gate cutting mechanism within the mold according to claim 1, characterized in that, The cutter has a shearing bevel and a stepped plane. Both the shearing bevel and the stepped plane are located at the end of the cutter away from the drive member. The shearing bevel is disposed away from the cavity of the lower mold. The stepped plane is located at the bottom of the shearing bevel. The stepped plane is used to be flush with the inner wall of the cavity when the cutter extends to the predetermined position.

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