A gate structure for reducing gate residue

Abstract

The utility model discloses a kind of in-mold quick cutting gate structures of reducing gate residue, the utility model relates to die gate quick cutting technical field, including fixed mould, movable mould and moving assembly, the movable mould is opened with glue inlet, the fixed mould and movable mould between being provided with the cavity through with glue inlet, the fixed mould is provided with hydraulic cylinder, hydraulic cylinder drives cutter assembly to move up, vertical rod follows and moves up, so that elastic expansion piece moves up along slider, when cutter assembly cuts off gate and product, at this time, elastic expansion piece is just aligned with slot, under the action of elastic reset force, insert into slot, realize the fixation of vertical rod position, so that cutter assembly can be fixed, so that subsequent no longer only rely on hydraulic cylinder pressure maintaining, can reduce its load, and even pressure maintaining failure, cutter can also be avoided to back off, thereby solve the problem that gate is prone to residue.

Description

Technical Field

[0001] This utility model relates to the field of quick-cut gate technology for mold gates, specifically a quick-cut gate structure for in-mold injection gate that reduces gate residue. Background Technology

[0002] Injection molds are used to pour molten plastic into a mold, shape it into the required form, and then cool and solidify it. After the mold is opened, the gate and the product need to be cut off. The in-mold quick-cut gate structure is a hot-cutting operation performed when the mold is at the end of the holding pressure, before the plastic has cooled and solidified.

[0003] Existing technology, such as the authorization announcement number CN213353393U, discloses an in-mold hot cutting mechanism for injection molds, which includes a lower mold, a limiting hole groove provided at the upper end of the lower mold, a mold cavity provided on one side of the limiting hole groove, a forming groove provided inside the mold cavity, a gate provided on one side of the forming groove, a limiting stop installed at the upper end of the gate, a cutting groove provided inside the limiting stop, a base installed below the lower mold, an upper mold installed above the lower mold, a limiting slide groove provided inside the upper mold, a fixed mounting box installed at the upper end of the limiting slide groove, a hydraulic cylinder installed inside the fixed mounting box, a telescopic rod installed at the lower end of the hydraulic cylinder, a fixed seat installed at the lower end of the telescopic rod, a cutting blade mounting seat installed below the fixed seat, a cutting blade mounting groove provided inside the cutting blade mounting seat, and a cutting blade installed inside the cutting blade mounting groove.

[0004] Current technology typically uses a hydraulic cylinder to drive a cutter upwards to remove the gate. However, after removing the gate, the hydraulic cylinder needs to maintain pressure to prevent the cutter from moving downwards, thus avoiding the molten plastic from re-adheding together before it cools and solidifies. However, for large molds, relying solely on the hydraulic cylinder for pressure maintenance requires extremely high hydraulic pressure, which increases the load on the cylinder. Furthermore, prolonged pressure maintenance using only the hydraulic cylinder can lead to cutter retraction if the pressure holding fails, causing the gate to re-adhere to the product and resulting in gate residue. Utility Model Content

[0005] To address the shortcomings of existing technologies, this invention provides an in-mold quick-cut gate structure that reduces gate residue and solves the problems existing in the prior art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a quick-cut gate structure for reducing gate residue in a mold, comprising a fixed mold, a moving mold, and a moving assembly. The moving mold has a gate, and a cavity communicating with the gate is provided between the fixed mold and the moving mold. A hydraulic cylinder is provided on the fixed mold, and the piston rod of the hydraulic cylinder is connected to a slide cylinder slidably connected to the fixed mold. A cutter assembly is provided on the slide cylinder. A vertical rod is provided on the cutter assembly, and an elastic telescopic member is provided on the vertical rod. A slide rail is provided on the fixed mold, and a slider with a slot is slidably connected to the slide rail. The elastic telescopic member matches the slider, and the moving assembly is used to move the slider along the slide rail.

[0007] Preferably, the elastic telescopic member includes a guide rod disposed on the vertical rod, a plug that matches the slot is slidably sleeved on the guide rod, and a spring is disposed between the plug and the vertical rod.

[0008] Preferably, the elastic telescopic member further includes rollers disposed on the insert block.

[0009] Preferably, both the insert and the slot are provided with chamfers.

[0010] Preferably, the moving component includes a fixed rod disposed on the moving mold, a movable rod hinged to the fixed rod by a pin, and the movable rod is also hinged to the slider by a pin.

[0011] Preferably, the cutter assembly includes a second spring disposed inside the slide cylinder, the second spring being connected to a slide block slidably connected inside the slide cylinder, and a cutter being detachably connected to the slide block, the slide block also being connected to a vertical rod that extends vertically through the slide cylinder.

[0012] This invention provides an in-mold quick-cut gate structure that reduces gate residue. Compared with the prior art, it has the following advantages:

[0013] 1. This in-mold quick-cut gate structure reduces gate residue. A hydraulic cylinder drives the cutter assembly to move upward, and the vertical rod follows. This causes the elastic telescopic component to move upward along the slider. When the cutter assembly cuts the gate from the product, the elastic telescopic component is aligned with the slot and inserts into the slot under the action of elastic restoring force, thus fixing the position of the vertical rod. This fixes the cutter assembly, so that subsequent pressure holding is no longer solely dependent on the hydraulic cylinder, reducing its load. Even if pressure holding fails, the cutter will not retract, thus solving the problem of gate residue. When it is necessary to move the cutter assembly downward to reset, the slider can be moved away from the elastic telescopic component by moving the component.

[0014] 2. The quick-cut gate structure in the in-mold that reduces gate residue has a moving component consisting of a fixed rod and a movable rod. This allows the fixed rod to directly pull the slider during mold opening, eliminating the need for a separate power source and requiring no additional operation. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the product under pressure during the present invention.

[0017] Figure 3 This is a schematic diagram of a partial structure of the present invention;

[0018] Figure 4 This is a schematic diagram of the product after the gate has been die-cut.

[0019] Figure 5 This is a schematic diagram of the product after mold opening;

[0020] Figure 6 This is a schematic diagram of the product of this utility model and its removal after the gate is cut off.

[0021] In the diagram: 1. Fixed mold; 2. Moving mold; 3. Entrance; 4. Cavity; 5. Hydraulic cylinder; 6. Slide cylinder; 7. Vertical rod; 8. Elastic telescopic component; 81. Guide rod; 82. Insert block; 83. Spring 1; 84. Roller; 9. Slide rail; 10. Slider; 11. Fixed rod; 12. Movable rod; 13. Spring 2; 14. Slide base; 15. Cutting knife. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] See Figures 1-6 This utility model provides the following two technical solutions:

[0024] The first embodiment: A quick-cut gate structure in the mold for reducing gate residue includes a fixed mold 1, a moving mold 2, and a moving assembly. The fixed mold 1 is fixed, and the moving mold 2 is connected to a telescopic mechanism such as a cylinder for opening and closing. The moving mold 2 has a gate 3. During production, the injection machine injects molten plastic into the gate 3. A cavity 4 is provided between the fixed mold 1 and the moving mold 2, which is connected to the gate 3. The molten plastic enters the cavity 4 for molding, but at this time the product and the gate in the gate 3 are stuck together. A hydraulic cylinder 5 is provided on the fixed mold 1. The piston rod of the hydraulic cylinder 5 is connected to a slide cylinder 6 that is slidably connected to the fixed mold 1. A cutter assembly is provided on the slide cylinder 6. When the mold closing and holding pressure ends, the hydraulic cylinder 5 drives the slide cylinder 6 to move upward, driving the cutter assembly to cut the product and the gate. At this time, the product and the gate have not yet cooled and solidified, which is hot cutting.

[0025] The cutting assembly is provided with a vertical rod 7, and an elastic telescopic member 8 is provided on the vertical rod 7. The fixed mold 1 is provided with a slide rail 9, and a slider 10 with a slot is slidably connected on the slide rail 9. The elastic telescopic member 8 matches the slider 10. The moving component is used to move the slider 10 along the slide rail 9.

[0026] As the cutter assembly moves upward, the vertical rod 7 moves upward as well, causing the elastic telescopic member 8 to move upward along the slider 10. When the cutter assembly cuts the gate from the product, the elastic telescopic member 8 is aligned with the slot and inserted into the slot under the action of elastic restoring force, thus fixing the position of the vertical rod 7. This fixes the cutter assembly, so that subsequent pressure holding is no longer solely dependent on the hydraulic cylinder 5, reducing its load. Even if pressure holding fails, the cutter assembly can be prevented from retracting, thus solving the problem of gate residue. When it is necessary to move the cutter assembly downward to reset, the slider 10 can be moved away from the elastic telescopic member 8 by moving the component.

[0027] The elastic telescopic component 8 includes a guide rod 81 mounted on the vertical rod 7. A plug 82 that matches the slot is slidably sleeved on the guide rod 81. A spring 83 is provided between the plug 82 and the vertical rod 7. When the plug 82 moves vertically on the slider 10, it compresses the spring 83. When aligned with the slot, the spring 83 pushes the plug 82 to move on the guide rod 81 and insert it into the slot, thus fixing the plug 82 and preventing it from moving vertically, thereby preventing the vertical rod 7 from moving vertically.

[0028] When the cutter assembly is pushed upward, the friction between the insert block 82 and the slider 10 is too large due to the pushing force of the spring 83. Therefore, the elastic telescopic member 8 also includes a roller 84 set on the insert block 82. In this way, the friction can be reduced by the roller 84 rolling on the slider 10.

[0029] To facilitate the insertion of the insert 82 into the slot, both the insert 82 and the slot are chamfered.

[0030] Moving the slider 10 via the moving component requires additional operation, which is cumbersome. Therefore, the moving component includes a fixed rod 11 mounted on the moving mold 2, with a movable rod 12 hinged to the fixed rod 11 via a pin. The movable rod 12 is also hinged to the slider 10 via a pin. Figure 2 and Figure 4 During mold closing, pressure holding, and cutting, the position of slider 10 is fixed, such as... Figure 5 When the mold is opened, the fixed rod 11 moves upward and pulls the movable rod 12, so that the movable rod 12 pulls the slider 10 to slide on the slide rail 9, which can make the slider 10 automatically leave the insert block 82, so that no additional power source is needed and no additional operation is required.

[0031] When the hydraulic cylinder 5 drives the cutting assembly to move upward to complete the cutting, the cutting blade is prone to impacting the top inner wall of the cavity 4 of the moving mold 2, which can easily cause wear. In order to reduce this impact force, a second implementation method is provided. The main difference between the second and first implementation methods is that the cutting assembly includes a second spring 13 installed in the slide cylinder 6. The second spring 13 is connected to a slide block 14 slidably connected in the slide cylinder 6, and the cutting blade 15 is detachably connected to the slide block 14. The slide block 14 is also connected to a vertical rod 7 that runs vertically through the slide cylinder 6. The slide cylinder 6 pushes the slide block 14 upward through the second spring 13, so that the cutting blade 15 moves upward to perform the cutting. The impact force after the cutting blade 15 has completed the cutting can be buffered by the second spring 13. When the cutting blade 15 stops moving upward, the position of the vertical rod 7 can be fixed. Therefore, fixing the vertical rod 7 also fixes the cutting blade 15, preventing it from retracting.

[0032] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0033] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0034] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A quick-cut gate structure for reducing gate residue in the mold, characterized in that: The device includes a fixed mold (1), a moving mold (2), and a moving assembly. The moving mold (2) has a sprue (3). A cavity (4) communicating with the sprue (3) is provided between the fixed mold (1) and the moving mold (2). A hydraulic cylinder (5) is provided on the fixed mold (1). The piston rod of the hydraulic cylinder (5) is connected to a slide cylinder (6) that is slidably connected to the fixed mold (1). A cutting assembly is provided on the slide cylinder (6). The cutter assembly is provided with a vertical rod (7), the vertical rod (7) is provided with an elastic telescopic member (8), the fixed mold (1) is provided with a slide rail (9), and a slider (10) with a slot is slidably connected on the slide rail (9). The elastic telescopic member (8) matches the slider (10), and the moving component is used to move the slider (10) along the slide rail (9).

2. The in-mold quick-cut gate structure for reducing gate residue as described in claim 1, characterized in that: The elastic telescopic member (8) includes a guide rod (81) disposed on the vertical rod (7), a plug (82) matching the slot is slidably sleeved on the guide rod (81), and a spring (83) is disposed between the plug (82) and the vertical rod (7).

3. The in-mold quick-cut gate structure for reducing gate residue as described in claim 2, characterized in that: The elastic telescopic member (8) also includes a roller (84) disposed on the insert (82).

4. The in-mold quick-cut gate structure for reducing gate residue as described in claim 2, characterized in that: Both the insert (82) and the slot are chamfered.

5. The in-mold quick-cut gate structure for reducing gate residue as described in claim 1, characterized in that: The moving component includes a fixed rod (11) disposed on the moving mold (2), a movable rod (12) is hinged to the fixed rod (11) by a pin, and the movable rod (12) is also hinged to the slider (10) by a pin.

6. The in-mold quick-cut gate structure for reducing gate residue according to claim 1, characterized in that: The cutter assembly includes a second spring (13) disposed in the slide cylinder (6), the second spring (13) being connected to a slide block (14) slidably connected in the slide cylinder (6), and a cutter (15) being detachably connected to the slide block (14). The slide block (14) is also connected to a vertical rod (7) that runs vertically through the slide cylinder (6).

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