Injection mold tunnel core-pulling mechanism with combined ejection structure

Abstract

The utility model discloses an injection mold tunnel core-pulling mechanism with combined ejection structure, and relates to the technical field of injection mold, and comprises front mould and back mould, and the back mould is detachably connected with the inclined guide rail, the tunnel slider is slidably assembled on the guide rail, the tunnel slider is transversely slidably connected on the top block, the product that is contacted with the tunnel slider and the top block is formed between the front mould and the back mould, when the hydraulic cylinder pulls the front mould to open, the connecting frame drives the adjusting mechanism to move, so that the moving mechanism gradually approaches the stop block mechanism, at this moment, the front mould has been separated from the back mould, and the product stripping is not affected, so when continuing to move the front mould, the moving mechanism can gradually push the stop block mechanism, so that the guide rod drives the top block to move forward, drives the tunnel slider to slide along the guide rail at the same time, realizes the tunnel core-pulling, compared with the prior art, can only need single hydraulic cylinder to realize the opening and closing of mould and the stripping of product, saves the production and maintenance cost.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, specifically to a tunnel core-pulling mechanism for injection molds with a combined ejector structure. Background Technology

[0002] In injection molding production, the demolding mechanism is an important component of plastic molds. Whether it can successfully eject the plastic part from the mold directly affects the production efficiency of the mold and the yield rate of the plastic part. In production, tunnel core pulling mechanism is often used to demold non-standard products.

[0003] Authorization announcement number CN217553016U discloses a tunnel slider core-pulling mechanism, which includes a guide block, a movable forming block, and a tunnel slider. The guide block is fixedly connected to the rear mold core. The guide block has a guide slope on the side facing the rear mold core, and a slide rail is provided on the guide slope. The slide rail extends along the inclined direction of the guide slope. The movable forming block is disposed between the guide block and the rear mold core. The movable forming block, the rear mold core, and the front mold core together form a cavity for molding injection molded products. The movable forming block can move in a direction parallel to the opening and closing of the injection mold. The movable forming block has a through-cavity inside, and the tunnel slider is slidably disposed in the through-cavity. One end of the tunnel slider extends to the outside of the through-cavity and is slidably connected to the slide rail through a slide groove. The other end of the tunnel slider extends into the cavity for molding holes on the injection molded products.

[0004] In existing technologies, the front and rear mold plates are first separated to separate the front and rear mold cores. Then, the output shaft of the hydraulic cylinder extends, driving the drive plate to move. The drive plate, through the drive rod, moves the movable molding block. During the movement of the movable molding block, the tunnel slider and the injection molded product move together. Furthermore, the tunnel slider, under the action of the guide block, moves and detaches from the injection molded product, thus completing the demolding action. In other existing technologies, the movable molding block and the tunnel slider are combined during product demolding. As the movable molding block moves upward, it drives the tunnel slider and the injection molded product together, achieving core pulling through the combined ejection method, thus quickly demolding the product. However, existing technologies require not only a hydraulic cylinder for mold opening and closing but also another hydraulic cylinder for demolding, resulting in higher costs and more complicated piping and control. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a core-pulling mechanism for injection molds with a combined ejector structure, which solves the problems existing in the prior art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a tunnel core-pulling mechanism for injection molds with a combined ejector structure, comprising a front mold and a rear mold. An inclined guide rail is detachably connected to the rear mold, and a tunnel slider is slidably mounted on the guide rail. The tunnel slider is laterally slidably connected to an ejector block. A product is formed between the front and rear molds, contacting both the tunnel slider and the ejector block. A guide rod penetrating the rear mold is provided on the rear side of the ejector block, and a stop mechanism is provided on the guide rod. A connecting frame is detachably connected to the front mold, and the distance between the moving mechanism and the stop mechanism is adjusted by an adjusting mechanism. The front mold is detachably connected to a hydraulic cylinder.

[0007] Preferably, the adjustment mechanism includes a slide groove formed on the connecting frame in the front-to-back direction, and a fixing block is detachably connected to the rear end of the connecting frame, with a screw threaded onto the fixing block.

[0008] Preferably, the moving mechanism includes a support plate slidably connected to the slide groove, and the support plate is rotatably connected to the screw via a bearing.

[0009] Preferably, the moving mechanism further includes a connecting rod that passes through the support plate in the front-rear direction, a buffer plate is provided at the front end of the connecting rod, and a buffer spring is provided between the buffer plate and the support plate.

[0010] Preferably, the stop mechanism includes a mounting block detachably connected to the rear end of the guide rod, a pull rod extending laterally through the mounting block, a stop block located in front of the buffer plate at the right end of the pull rod, and a return spring connecting the stop block and the mounting block.

[0011] Preferably, the rear side of the stop block has a recessed hole, and the front side of the buffer plate has a protrusion that can be inserted into the recessed hole.

[0012] This utility model provides a tunnel core-pulling mechanism for injection molds with a combined ejector structure. Compared with the prior art, it has the following advantages:

[0013] 1. This injection mold tunnel core-pulling mechanism with a combined ejector structure first determines the distance between the front and rear molds after product demolding based on the product's size and shape. Then, the distance between the moving mechanism and the stop mechanism is adjusted by the adjusting mechanism to reduce the problem of excessive mold opening driven by the hydraulic cylinder. When the hydraulic cylinder pulls the front mold open, the connecting frame drives the adjusting mechanism to move, causing the moving mechanism to gradually approach the stop mechanism. At this time, the front mold has already separated from the rear mold and does not affect product demolding. As the front mold continues to move, the moving mechanism can gradually push the stop mechanism, thereby causing the guide rod to move the ejector block forward, which in turn moves the tunnel slider forward while sliding along the guide rail to achieve tunnel core pulling. Compared with the existing technology, only a single hydraulic cylinder is needed to achieve mold opening and closing and product demolding, saving production and maintenance costs.

[0014] 2. The injection mold tunnel core-pulling mechanism with combined ejector structure has a stop block on the stop block mechanism connected by a pull rod and a return spring. This allows for easy assembly or disassembly of the front or rear mold in the front-to-back direction by simply pulling the pull rod, without the need for laborious and time-consuming removal of the connecting frame. It also ensures that the stop block and buffer plate do not obstruct each other. Attached Figure Description

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

[0016] Figure 2 This utility model Figure 1 A cross-sectional schematic diagram;

[0017] Figure 3 This is a schematic diagram of the tunnel slider, guide rail, top block, guide rod, and stop block mechanism of this utility model;

[0018] Figure 4 This is a cross-sectional view of the moving mechanism and the stop block of this utility model when they are in contact.

[0019] In the diagram: 1. Front mold; 2. Rear mold; 3. Product; 4. Guide rail; 5. Tunnel slider; 6. Top block; 7. Guide rod; 8. Stopping mechanism; 81. Mounting block; 82. Tie rod; 83. Stopping block; 84. Return spring; 85. Recessed hole; 9. Connecting frame; 10. Adjusting mechanism; 101. Slide groove; 102. Fixing block; 103. Screw; 11. Moving mechanism; 111. Support plate; 112. Connecting rod; 113. Buffer plate; 114. Buffer spring; 115. Protrusion. Detailed Implementation

[0020] 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.

[0021] See Figures 1-4 This utility model provides the following three technical solutions:

[0022] The first implementation: A tunnel core-pulling mechanism for an injection mold with a combined ejector structure, including a front mold 1 and a rear mold 2. The front mold 1 is detachably connected to a hydraulic cylinder via a front connecting seat. The rear mold 2 is fixed at the desired location via a left connecting seat, and guide pillars guiding the front mold 1 are provided around the rear mold 2. An inclined guide rail 4 is detachably connected to the rear mold 2, and a tunnel slider 5 is slidably mounted on the guide rail 4. The tunnel slider 5 is laterally slidably connected to an ejector block 6. A product 3 is formed between the front mold 1 and the rear mold 2, which contacts both the tunnel slider 5 and the ejector block 6. A guide rod 7 is provided on the rear side of block 6, which passes through the rear mold 2. A stop mechanism 8 is provided on the guide rod 7. A connecting frame 9 is detachably connected to the front mold 1. The distance between the moving mechanism 11 and the stop mechanism 8 is adjusted by the adjusting mechanism 10. The distance between the front mold 1 and the rear mold 2 after the product 3 is demolded is determined according to the size and shape of the product. Then, the distance between the moving mechanism 11 and the stop mechanism 8 is adjusted by the adjusting mechanism 10. In this way, it can be determined when to demold the product 3 when the mold is opened, so as to reduce the problem of the hydraulic cylinder driving the front mold to over-open the mold.

[0023] When the hydraulic cylinder pulls the front mold 1 to open the mold, the connecting frame 9 drives the adjusting mechanism 10 to move, so that the moving mechanism 11 gradually approaches the stop mechanism 8. At this time, the front mold 1 has already separated from the rear mold 2, which does not affect the demolding of the product 3. When the front mold 1 continues to move, the moving mechanism 11 can gradually push the stop mechanism 8, so that the guide rod 7 drives the top block 6 to move forward, and drives the tunnel slider 5 to move forward while sliding along the guide rail 4 to realize the tunnel core pulling. Compared with the existing technology, only a single hydraulic cylinder is needed to realize the opening and closing of the mold and the demolding of the product, saving production and maintenance costs. When the mold is closed, the front mold 1 pushes the top block 6 to reset backward.

[0024] The adjusting mechanism 10 includes a slide groove 101 formed on the connecting frame 9 in the front-to-back direction. A fixing block 102 is detachably connected to the rear end of the connecting frame 9, and a screw 103 is screwed onto the fixing block 102. The moving mechanism 11 includes a support plate 111 slidably connected to the slide groove 101. The support plate 111 is rotatably connected to the screw 103 via a bearing. Rotating the handwheel on the screw 103 causes the screw 103 to move on the fixing block 102, thereby causing the support plate 111 to slide on the slide groove 101 to adjust the distance between the support plate 111 and the stop mechanism 8.

[0025] Each contact results in a hard collision, which can easily cause wear between the screw 103 and the fixed block 102. Therefore, the moving mechanism 11 also includes a connecting rod 112 that passes through the support plate 111 in the front-back direction. A buffer plate 113 is provided at the front end of the connecting rod 112. A buffer spring 114 is provided between the buffer plate 113 and the support plate 111. When the buffer plate 113 contacts the stop mechanism 8, the buffer plate 113 moves the connecting rod 112, causing the buffer spring 114 to be compressed, thereby achieving the purpose of buffer protection.

[0026] Since the front mold 1 and the rear mold 2 are guided by guide pillars, when it is necessary to disassemble and move forward and backward, the stop mechanism 8 will obstruct the buffer plate 113. At this time, it is necessary to remove the connecting frame 9 to avoid affecting the disassembly and assembly, which is troublesome, time-consuming and laborious. Therefore, a second implementation method is set up. The main difference between the second and third implementation methods is that the stop mechanism 8 includes a mounting block 81 detachably connected to the rear end of the guide rod 7. A pull rod 82 runs horizontally through the mounting block 81. A stop 83 located in front of the buffer plate 113 is set at the right end of the pull rod 82. A return spring 84 is connected between the stop 83 and the mounting block 81. The buffer plate 113 and the stop 83 are opposite to each other to ensure the demolding of the product. When the front mold 1 and the rear mold 2 are needed, the pull rod 82 can be pulled to move the stop 83 and compress the return spring 84 to avoid obstruction with the buffer plate 113.

[0027] Since the stop block 83 can move laterally using a return spring 84 and a pull rod 82, under long-term impact and wear, once the rear side of the stop block 83 is worn into a slope, it may be pushed to the left when pushed forward by the buffer plate 113. Once it moves to the left and can no longer be pushed by the buffer plate 113, it will affect the demolding of the product. Therefore, a third implementation method is provided. The main difference between the third and fourth implementation methods is that the rear side of the stop block 83 is provided with a recessed hole 85, and the front side of the buffer plate 113 is provided with a protrusion 115 that can be inserted into the recessed hole 85. After the buffer plate 113 contacts the stop block 83, the protrusion 115 enters the recessed hole 85. In this way, when the stop block 83 moves to the left, the recessed hole 85 is blocked by the protrusion 115, which can prevent the stop block 83 from moving to the left during demolding.

[0028] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0029] 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.

[0030] 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 tunnel core-pulling mechanism for injection molds with a combined ejector structure, characterized in that: The device includes a front mold (1) and a rear mold (2). The rear mold (2) is detachably connected to an inclined guide rail (4). A tunnel slider (5) is slidably mounted on the guide rail (4). The tunnel slider (5) is laterally slidably connected to a top block (6). A product (3) is formed between the front mold (1) and the rear mold (2) and contacts both the tunnel slider (5) and the top block (6). A guide rod (7) penetrating the rear mold (2) is provided on the rear side of the top block (6). A stop mechanism (8) is provided on the guide rod (7). A connecting frame (9) is detachably connected to the front mold (1). The connecting frame (9) adjusts the distance between the moving mechanism (11) and the stop mechanism (8) through an adjusting mechanism (10). The front mold (1) is detachably connected to a hydraulic cylinder.

2. The injection mold tunnel core-pulling mechanism with a combined ejector structure according to claim 1, characterized in that: The adjustment mechanism (10) includes a slide groove (101) opened on the connecting frame (9) in the front-rear direction. A fixing block (102) is detachably connected to the rear end of the connecting frame (9), and a screw rod (103) is screwed onto the fixing block (102).

3. The injection mold tunnel core-pulling mechanism with a combined ejector structure according to claim 2, characterized in that: The moving mechanism (11) includes a support plate (111) slidably connected to the slide groove (101), and the support plate (111) is rotatably connected to the screw (103) via a bearing.

4. The injection mold tunnel core-pulling mechanism with a combined ejector structure according to claim 3, characterized in that: The moving mechanism (11) also includes a connecting rod (112) that passes through the support plate (111) in the front-back direction. A buffer plate (113) is provided at the front end of the connecting rod (112), and a buffer spring (114) is provided between the buffer plate (113) and the support plate (111).

5. The injection mold tunnel core-pulling mechanism with a combined ejector structure according to claim 4, characterized in that: The stop mechanism (8) includes a mounting block (81) detachably connected to the rear end of the guide rod (7). A pull rod (82) extends laterally through the mounting block (81). A stop block (83) located in front of the buffer plate (113) is provided at the right end of the pull rod (82). A return spring (84) is connected between the stop block (83) and the mounting block (81).

6. The injection mold tunnel core-pulling mechanism with a combined ejector structure according to claim 5, characterized in that: The stop block (83) has a recessed hole (85) on its rear side, and the buffer plate (113) has a protrusion (115) on its front side that can be inserted into the recessed hole (85).

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