Hydraulic expansion fastening structure of injection mold special-shaped insert

Abstract

The utility model relates to injection mold technical field discloses a kind of hydraulic expansion fastening structure of injection mold special-shaped insert, to solve the problems of low dismounting efficiency, vulnerable component, poor adaptability of existing special-shaped insert fastening mode exist. The structure includes injection mold, insert, hydraulic fastening mechanism and mould frame groove;Injection mold is equipped with the mould frame groove compatible with the profile of insert, and hydraulic fastening mechanism is arranged inside injection mold, and insert is detachably arranged in mould frame groove by hydraulic fastening mechanism;Hydraulic fastening mechanism includes pipeline assembly, plug-in slot, sealing cover plate, telescopic top block, telescopic slot cavity and telescopic plate, and the bottom of insert is equipped with the plug-in plate compatible with plug-in slot. The utility model realizes the quick and accurate dismounting of insert by hydraulic drive, without damaging insert structure, without stress concentration, and reliable fastening, not easy to damage component, adapt to the frequent replacement demand of special-shaped insert, significantly improve mould service life and plastic part forming precision.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, and more specifically, to a hydraulic expansion fastening structure for irregularly shaped inserts in injection molds. Background Technology

[0002] In the injection mold production process, irregular inserts (such as inserts with complex curved surfaces and non-standard contours) are the core functional components for molding special structure plastic parts. The reliability of their fastening with the injection mold frame directly determines the molding accuracy and surface quality of the plastic parts, and also affects the overall service life of the mold.

[0003] In existing technologies, the fastening methods between irregularly shaped inserts and mold frames are mainly divided into two categories, but both have obvious drawbacks: 1. Bolted Connection: Bolt holes need to be made on the irregularly shaped insert body to fix it to the mold frame. This method has two major problems: First, the bolt holes will destroy the structural integrity of the insert, causing stress concentration inside the insert, which is prone to cracking and deformation under long-term injection pressure; Second, the irregular contour of the irregularly shaped insert restricts the placement of bolts (which need to avoid the molding surface and critical stress areas), resulting in insufficient fastening stability. Moreover, the bolts need to be removed / installed one by one during disassembly and assembly, which is cumbersome and inefficient, and cannot meet the needs of rapid mold change in mass production.

[0004] 2. Interference Fit Type: This type relies on the interference fit between the mold frame groove and the insert to achieve a tight fit. During assembly, a press is needed to force the insert into the mold frame groove. This method is prone to scratching the mating surfaces of the mold frame groove and the insert, affecting the subsequent molding accuracy of the plastic part. Disassembly requires heating the mold frame (using the principle of thermal expansion and contraction to expand the mold frame groove size) or using external force such as hammering tools. This not only easily leads to permanent deformation of the mold frame but may also damage the insert, making it completely unsuitable for the frequent replacement of irregularly shaped inserts.

[0005] To address the pain points of the existing technology, there is an urgent need to design a fastening structure that adapts to the contours of irregular inserts, is efficient and convenient to assemble and disassemble, is reliable in fastening and does not damage the inserts and mold frame, so as to improve injection molding production efficiency and plastic part quality. Utility Model Content

[0006] To address the shortcomings of existing methods, the purpose of this utility model is to provide a hydraulic expansion fastening structure for irregularly shaped inserts in injection molds. This structure solves the problems of low disassembly and assembly efficiency, easy damage to components, and poor adaptability associated with existing bolt-connection and interference fit fastening methods. It enables rapid and accurate disassembly and assembly of irregularly shaped inserts and long-term reliable fastening, while protecting the structural integrity of the inserts and the mold frame.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A hydraulic expansion fastening structure for a non-standard insert in an injection mold includes an injection mold, an insert, a hydraulic fastening mechanism, and a mold frame groove; the injection mold has a mold frame groove adapted to the contour of the insert, the injection mold has a hydraulic fastening mechanism inside, and the insert is detachably disposed inside the mold frame groove through the hydraulic fastening mechanism. The hydraulic fastening mechanism includes a pipeline assembly, a plug groove, a sealing cover, a telescopic top block, a telescopic cavity, and a telescopic plate; the telescopic cavity and the plug groove are both opened at the bottom of the mold frame groove and are connected to each other; the telescopic cavity is provided with a telescopic top block that can be telescopically moved; a telescopic plate is fixed on the left side of the telescopic top block; and a sealing cover is installed on the upper side of the telescopic cavity. The insert has two sets of symmetrically distributed plug plates at its bottom, and the specifications of the plug plates are compatible with the specifications of the plug slots.

[0008] Furthermore, multiple arc-shaped limiting protrusions are evenly distributed on the right side of the telescopic top block, and a limiting groove adapted to the limiting protrusion is opened on the side of the plug plate corresponding to the limiting protrusion.

[0009] Furthermore, a sealing groove is provided at the connection between the telescopic cavity and the insertion groove, and a sealing ring is installed inside the sealing groove. The sealing ring is sleeved on the outside of the telescopic top block and is slidably connected to it in a sealing manner.

[0010] Furthermore, the outer periphery of the telescopic plate is provided with a sealing edge; the sealing cover is fixedly connected to the injection mold by multiple sets of miniature hexagonal screws, and the connection surfaces of the two are coated with sealant.

[0011] Furthermore, a stop block is fixed on the left side of the telescopic plate, and two sets of stop bars are fixed on the front and rear sides near the edge of the right side of the telescopic plate. The thickness of the stop block is the same as the length of the stop bar.

[0012] Furthermore, the piping assembly includes a first pipe, a second pipe, a flow divider hydraulic valve, a first hydraulic pipe, a first three-way hydraulic valve, a second three-way hydraulic valve, a second hydraulic pipe, a sealing joint, a first hydraulic flow channel, and a second hydraulic flow channel; the first hydraulic flow channel and the second hydraulic flow channel are parallel to each other inside the injection mold, and their inner ends are connected to the telescopic groove cavity, while their outer ends are located on the outer surface of the injection mold; the outer end of the first hydraulic flow channel is connected to the second pipe through a sealing joint, and the second hydraulic flow channel is connected to the first pipe through a sealing joint; both the first pipe and the second pipe are connected to the flow divider hydraulic valve; the flow divider hydraulic valve is connected to the first three-way hydraulic valve and the second three-way hydraulic valve respectively through two sets of first hydraulic pipes; and the first three-way hydraulic valve and the second three-way hydraulic valve are respectively connected to an external hydraulic control system through second hydraulic pipes.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. This utility model uses an external hydraulic control system to drive the telescopic top block to move, thereby enabling the quick fastening and disassembly of inserts. It eliminates the need to operate the bolts one by one or to use a press, greatly improving the efficiency of disassembly and assembly and adapting to the needs of frequent mold changes.

[0014] 2. This utility model eliminates the need for bolt holes in the inserts, avoiding structural damage and stress concentration; at the same time, it eliminates the need for forced pressing or hammering disassembly, protecting the mating surfaces of the mold frame groove and the inserts, and extending the service life of the components.

[0015] 3. This utility model achieves a tight fit between the telescopic top block and the plug plate through hydraulic driving force. With the limiting effect of the limiting protrusion and the limiting groove, it can effectively prevent the insert from shifting laterally and moving longitudinally. The fastening stability is significantly better than the existing method.

[0016] 4. This utility model uses a multi-seal design of sealing ring, sealing edge, sealing cover plate and sealant to ensure that there is no leakage of hydraulic oil in the telescopic groove cavity and to ensure the long-term stable operation of the hydraulic fastening mechanism.

[0017] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0020] Figure 2 This is a schematic diagram of the disassembled structure of this utility model.

[0021] Figure 3 This is a schematic diagram of the injection mold in this utility model.

[0022] Figure 4 This is a partial sectional view of the injection mold in this utility model.

[0023] Figure 5 This is a partial structural diagram of the hydraulic fastening mechanism in this utility model.

[0024] Figure 6 This is a cross-sectional view of the hydraulic fastening mechanism in this utility model.

[0025] Figure 7 This is a schematic diagram of the telescopic top block in this utility model.

[0026] Figure 8 This is a schematic diagram of the telescopic top block from another angle in this utility model.

[0027] Figure 9 This is a schematic diagram of the insert structure in this utility model.

[0028] In the diagram: 1. Injection mold; 2. Insert; 21. Insert plate; 22. Limiting groove; 3. Hydraulic fastening mechanism; 31. Piping assembly; 311. First pipeline; 312. Second pipeline; 313. Diverting hydraulic valve; 314. First hydraulic pipe; 315. First three-way hydraulic valve; 316. Second three-way hydraulic valve; 317. Second hydraulic pipe; 318. Sealing joint; 319. First hydraulic flow channel; 3110. Second hydraulic flow channel; 32. Insert groove; 33. Sealing cover plate; 34. Telescopic top block; 35. Telescopic groove cavity; 36. Sealing ring; 361. Sealing groove; 37. Limiting protrusion; 38. Sealing edge; 381. Stop block; 39. Stop bar; 310. Telescopic plate; 4. Mold frame groove. Detailed Implementation

[0029] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0030] Example 1: As Figures 1 to 9 As shown, this embodiment provides a hydraulic expansion fastening structure for a non-standard insert of an injection mold, including an injection mold 1, an insert 2, a hydraulic fastening mechanism 3, and a mold frame groove 4.

[0031] Among them, the injection mold 1 is the installation base of the overall structure. Its surface has a mold frame groove 4. The outline of the mold frame groove 4 is completely matched with the outer outline of the insert 2, ensuring that the insert 2 can be initially positioned after being placed in, and avoiding lateral displacement.

[0032] As the core component of the plastic part molding, the insert 2 has two symmetrically distributed plug plates 21 integrally molded at the bottom. The thickness and width of the plug plates 21 are completely matched with the plug groove 32 at the bottom of the mold frame groove 4, and are used to connect the insert 2 with the hydraulic fastening mechanism 3.

[0033] The hydraulic fastening mechanism 3 is the core component for fastening and disassembling the insert 2, including the pipeline assembly 31, the insertion groove 32, the sealing cover plate 33, the telescopic top block 34, the telescopic groove cavity 35, and the telescopic plate 310. The insertion slot 32 and the telescopic cavity 35 are both located at the bottom of the mold frame slot 4 and are interconnected. The insertion slot 32 is used to accommodate the insertion plate 21 of the insert 2, and the telescopic cavity 35 provides telescopic movement space for the telescopic top block 34.

[0034] The telescopic top block 34 is located inside the telescopic groove cavity 35 and can move along the axis of the telescopic groove cavity 35. Its left side is fixedly connected to the telescopic plate 310. The outer circumferential surface of the telescopic plate 310 is provided with a sealing edge 38 to enhance the sealing performance of the telescopic groove cavity 35 and prevent hydraulic oil leakage.

[0035] The sealing cover 33 is fixed to the upper side of the telescopic cavity 35 by multiple sets of miniature hexagonal screws. The connection surface between the cover and the injection mold 1 is coated with sealant to further improve the sealing performance of the telescopic cavity 35 and prevent hydraulic oil from leaking from the top.

[0036] The piping assembly 31 is used to supply or recover hydraulic oil to the telescopic cavity 35 and drive the telescopic top block 34 to move. It includes a first pipe 311, a second pipe 312, a diverting hydraulic valve 313, a first hydraulic pipe 314, a first three-way hydraulic valve 315, a second three-way hydraulic valve 316, a second hydraulic pipe 317, a sealing joint 318, a first hydraulic flow channel 319, and a second hydraulic flow channel 3110. The first hydraulic flow channel 319 and the second hydraulic flow channel 3110 are opened parallel inside the injection mold 1, with their inner ends connected to the telescopic cavity 35 and their outer ends connected to the second pipe 312 and the first pipe 311 respectively through the sealing joint 318. The first pipe 311 and the second pipe 312 are both connected to the diverting hydraulic valve 313. The diverting hydraulic valve 313 is connected to the first three-way hydraulic valve 315 and the second three-way hydraulic valve 316 through the first hydraulic pipe 314, and finally connected to the external hydraulic control system through the second hydraulic pipe 317 to achieve precise control of the hydraulic oil.

[0037] Furthermore, multiple arc-shaped limiting protrusions 37 are evenly distributed on the right side of the telescopic top block 34, and the corresponding position of the plug plate 21 is provided with a limiting groove 22 that is adapted to the limiting protrusions 37; when the telescopic top block 34 is pressed against the plug plate 21, the limiting protrusions 37 are embedded in the limiting groove 22 to prevent the insert 2 from moving longitudinally and improve the fastening reliability.

[0038] In addition, a sealing groove 361 is provided at the connection between the telescopic groove cavity 35 and the insertion groove 32, and a sealing ring 36 is installed inside. The sealing ring 36 is sleeved on the outside of the telescopic top block 34 and is slidably connected to it to prevent hydraulic oil from leaking from the connection between the two.

[0039] Furthermore, a stop block 381 is fixed on the left side of the telescopic plate 310, and two sets of stop bars 39 are fixed at the front and rear edges of the right side, with the thickness of the stop block 381 being the same as the length of the stop bar 39; the stop block 381 can restrict the telescopic plate 310 from moving excessively to the left, and the stop bar 39 can restrict the telescopic plate 310 from moving excessively to the right, so as to avoid collision and wear between the telescopic top block 34 and the inner wall of the telescopic groove cavity 35, and extend the service life of the components.

[0040] Example 2: This example provides the working principle of a hydraulic expansion fastening structure for irregularly shaped inserts in injection molds: First, assemble the sealing ring 36 into the sealing groove 361 at the connection between the telescopic cavity 35 and the insertion groove 32; place the telescopic top block 34 into the telescopic cavity 35, ensuring that the outer side of the telescopic top block 34 is tightly fitted with the sealing ring 36, and ensuring that the sealing edge 38 on the outer periphery of the telescopic plate 310 is fitted with the inner wall of the telescopic cavity 35; apply sealant to the connection surface between the sealing cover plate 33 and the injection mold 1, and fix the sealing cover plate 33 to the upper side of the telescopic cavity 35 with multiple sets of miniature hexagonal screws; connect the outer end of the first hydraulic flow channel 319 through the sealing joint. 318 connects to the second pipeline 312, and the outer end of the second hydraulic flow channel 3110 is connected to the first pipeline 311 through the sealing joint 318; the first pipeline 311 and the second pipeline 312 are respectively connected to the two input ends of the diverting hydraulic valve 313; the two output ends of the diverting hydraulic valve 313 are respectively connected to the first three-way hydraulic valve 315 and the second three-way hydraulic valve 316 through two sets of first hydraulic pipes 314; the output ends of the first three-way hydraulic valve 315 and the second three-way hydraulic valve 316 are connected to the external hydraulic control system through the second hydraulic pipe 317; Align the insertion plate 21 at the bottom of insert 2 with the insertion slot 32 at the bottom of mold frame slot 4, and slowly insert insert 2 to complete the initial positioning. Start the external hydraulic control system. Hydraulic oil enters the first three-way hydraulic valve 315 and the second three-way hydraulic valve 316 through the second hydraulic pipe 317, and is then delivered to the diversion hydraulic valve 313 through the first hydraulic pipe 314. The diversion hydraulic valve 313 distributes the hydraulic oil to the second pipeline 312. The hydraulic oil enters the first hydraulic flow channel 319 through the sealing joint 318, and finally flows into the telescopic groove cavity 35. The hydraulic oil pressure in the telescopic groove cavity 35 increases, pushing the telescopic top block 34 to move towards the insertion groove 32 until the right side of the telescopic top block 34 is tightly fitted with the left side of the insertion plate 21. At the same time, the limiting protrusion 37 on the telescopic top block 34 is embedded in the limiting groove 22 of the insertion plate 21. The external hydraulic control system maintains stable pressure, and the insert 2 is reliably fastened, allowing the injection molding operation to begin.

[0041] After the injection molding operation is completed, the oil supply circuit of the external hydraulic control system is closed and the oil return circuit is opened; the hydraulic oil in the telescopic cavity 35 is injected into the telescopic cavity 35 through the second hydraulic flow channel 3110, and at the same time, the hydraulic oil inside the space on the left side of the telescopic plate 310 flows back to the external hydraulic control system through the first flow channel, and uses hydraulic pressure to push the telescopic top block 34 back, pushing the telescopic top block 34 to move to the left and reset to the inside of the telescopic cavity 35, and the limiting protrusion 37 is dislodged from the limiting groove 22; at this time, the insert 2 can be directly removed upwards to complete the disassembly.

[0042] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. For those skilled in the art, other variations or modifications can be made based on the above description. It is impossible to exhaustively list all the implementation methods here. Any obvious variations or modifications derived from the technical solutions of this utility model are still within the protection scope of this utility model.

Claims

1. A hydraulic expansion fastening structure for irregularly shaped inserts in injection molds, characterized in that, It includes an injection mold (1), an insert (2), a hydraulic fastening mechanism (3), and a mold frame groove (4); the injection mold (1) has a mold frame groove (4) that matches the contour of the insert (2), the injection mold (1) has a hydraulic fastening mechanism (3) inside, and the insert (2) is detachably located inside the mold frame groove (4) through the hydraulic fastening mechanism (3); The hydraulic fastening mechanism (3) includes a pipeline assembly (31), a plug groove (32), a sealing cover plate (33), a telescopic top block (34), a telescopic cavity (35), and a telescopic plate (310); the telescopic cavity (35) and the plug groove (32) are both opened at the bottom of the mold frame groove (4) and are connected to each other. The telescopic cavity (35) is provided with a telescopic top block (34) that can be telescopically moved. The telescopic top block (34) is fixed on the left side of the telescopic top block (34). The sealing cover plate (33) is installed on the upper side of the telescopic cavity (35). The insert (2) has two sets of symmetrically distributed plug plates (21) at its bottom, and the specifications of the plug plates (21) are compatible with the specifications of the plug slots (32).

2. The hydraulic expansion fastening structure for irregularly shaped inserts in injection molds according to claim 1, characterized in that: Multiple arc-shaped limiting protrusions (37) are evenly distributed on the right side of the telescopic top block (34), and a limiting groove (22) adapted to the limiting protrusion (37) is opened on the side of the plug plate (21) corresponding to the limiting protrusion (37).

3. The hydraulic expansion fastening structure for irregularly shaped inserts in injection molds according to claim 1, characterized in that: A sealing groove (361) is provided at the connection between the telescopic groove cavity (35) and the insertion groove (32). A sealing ring (36) is installed inside the sealing groove (361), and the sealing ring (36) is sleeved on the outside of the telescopic top block (34) and is slidably connected to it.

4. The hydraulic expansion fastening structure for irregularly shaped inserts in injection molds according to claim 1, characterized in that: The telescopic plate (310) has a sealing edge (38) on its outer periphery; the sealing cover plate (33) is fixedly connected to the injection mold (1) by multiple sets of miniature internal hexagon screws, and the connection surfaces of the two are coated with sealant.

5. The hydraulic expansion fastening structure for irregularly shaped inserts in injection molds according to claim 1, characterized in that: A stop block (381) is fixed on the left side of the telescopic plate (310), and two sets of stop bars (39) are fixed on the front and rear sides near the edge of the right side of the telescopic plate (310). The thickness of the stop block (381) is the same as the length of the stop bar (39).

6. The hydraulic expansion fastening structure for irregularly shaped inserts in injection molds according to claim 1, characterized in that: The piping assembly (31) includes a first pipe (311), a second pipe (312), a diverting hydraulic valve (313), a first hydraulic pipe (314), a first three-way hydraulic valve (315), a second three-way hydraulic valve (316), a second hydraulic pipe (317), a sealing joint (318), a first hydraulic flow channel (319), and a second hydraulic flow channel (3110); the first hydraulic flow channel (319) and the second hydraulic flow channel (3110) are parallel to each other inside the injection mold (1), and their inner ends are connected to the telescopic groove cavity (35), and their outer ends are located on the outer surface of the injection mold (1); the first hydraulic flow channel (319) The outer end is connected to a second pipeline (312) via a sealing joint (318). The second hydraulic flow channel (3110) is connected to a first pipeline (311) via a sealing joint (318). Both the first pipeline (311) and the second pipeline (312) are connected to a flow divider hydraulic valve (313). The flow divider hydraulic valve (313) is connected to a first three-way hydraulic valve (315) and a second three-way hydraulic valve (316) via two sets of first hydraulic pipes (314). The first three-way hydraulic valve (315) and the second three-way hydraulic valve (316) are connected to an external hydraulic control system via second hydraulic pipes (317).

Images