A mold structure for preventing the retreat of an oil cylinder core

Abstract

The utility model relates to a kind of mould structure for preventing oil cylinder core-pulling retreat, belong to die casting mould technical field, including oil cylinder body, the outside of oil cylinder body is equipped with the locking assembly for preventing core-pulling retreat, the locking assembly includes the oil cylinder fixed plate fixedly connected in the outside of oil cylinder body, the left and right sides of the bottom of oil cylinder fixed plate are all fixedly connected with guide block, the opposite side between the left and right sides of guide block is slidably connected with slider block, the inside of slider block is provided with the wedge block of two, the one end of the oil cylinder body piston rod is fixedly connected with pressing plate.The mould structure for preventing oil cylinder core-pulling retreat, by the inclined plane of pressing plate drive two wedge block horizontal motion, make it wedge into the locking groove of guide block, using the mechanical self-locking principle of inclined plane mechanism, the force of core-pulling retreat is directly converted into greater normal pressure and friction force between wedge block and locking groove, to realize pure mechanical type rigid locking.

Description

Technical Field

[0001] This utility model relates to the field of die-casting mold technology, specifically a mold structure to prevent the hydraulic cylinder from retracting after core pulling. Background Technology

[0002] In the field of injection molding, hydraulic cylinder core-pulling mechanisms are widely used to form complex features such as side holes and undercuts in products. After completing the core-pulling action, the mechanism must remain in a stable position to withstand the enormous cavity pressure during injection molding and prevent the mandrel from accidentally retracting, which could lead to product dimensional deviations or molding defects.

[0003] Currently, the main method to prevent the hydraulic cylinder core from retracting still heavily relies on the continuous pressure maintenance of the hydraulic system. However, in actual production, the hydraulic system is prone to pressure fluctuations, internal leakage, or pressure decay due to temperature rise. Combined with external factors such as mechanical vibration, this often causes a slight retraction of the mandrel, resulting in batch quality accidents. To compensate for the shortcomings of pure hydraulic locking, the industry has tried various auxiliary measures: First, using a spring-assisted locking structure, utilizing spring force to provide additional locking force; however, springs are prone to fatigue relaxation or breakage under long-term alternating loads, making reliability difficult to guarantee and requiring frequent replacement. Second, using high-precision solenoid valves and complex hydraulic circuit control systems, controlling locking and releasing in real time via electrical signals; however, this system is costly, complex in structure, and has electrical response delays and failure risks, making maintenance difficult. Therefore, a mold structure to prevent the hydraulic cylinder core from retracting is proposed to solve the above problems. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a mold structure for preventing the hydraulic cylinder from retracting after core pulling, which has the advantages of reliable locking and no need for additional energy, thus solving the problems mentioned in the background technology.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A mold structure for preventing the hydraulic cylinder from retracting during core pulling includes a hydraulic cylinder body, wherein a locking component for preventing core pulling is provided on the outer side of the hydraulic cylinder body.

[0007] The locking assembly includes a cylinder fixing plate fixedly connected to the outside of the cylinder body. Guide blocks are fixedly connected to the left and right sides of the bottom of the cylinder fixing plate. A slider seat is slidably connected between the opposite sides of the guide blocks on the left and right sides. Two wedge blocks are provided on the inner side of the slider seat. A pressure plate is fixedly connected to one end of the piston rod of the cylinder body.

[0008] Furthermore, an insert positioning plate is fixedly connected to the bottom of the slider seat, and an insert body is fixedly connected to the bottom of the insert positioning plate.

[0009] Furthermore, the pressure plate is convex, and a receiving cavity adapted to the pressure plate is opened at the center of the inner side of the slider seat.

[0010] Furthermore, the left and right sides of the inner side of the slider seat are provided with grooves that communicate with the receiving cavity, and the two wedge blocks are respectively slidably connected to the inner side of the corresponding grooves.

[0011] Furthermore, the pressure plate is slidably connected between the inner left and right side walls of the receiving cavity, and the bottom of the pressure plate is provided with inclined surfaces on both the left and right sides.

[0012] Furthermore, the inclined surface on the left side of the bottom of the pressure plate is adapted to the wedge block on the left, and the inclined surface on the right side of the bottom of the pressure plate is adapted to the wedge block on the right.

[0013] Furthermore, each of the guide blocks on the left and right sides has a locking groove on its opposite side that is adapted to the wedge block.

[0014] Furthermore, the inner side of the cylinder fixing plate is provided with a piston rod extension port that is adapted to the piston rod of the cylinder body.

[0015] Compared with the prior art, this utility model provides a mold structure to prevent the hydraulic cylinder from retracting, which has the following beneficial effects:

[0016] This mold structure, designed to prevent the hydraulic cylinder from retracting its core, uses the inclined surface of the pressure plate to drive two wedge blocks to move horizontally, causing them to wedge into the locking groove of the guide block. Utilizing the mechanical self-locking principle of the inclined surface mechanism, the force of the core retraction is directly converted into greater positive pressure and friction between the wedge block and the locking groove, thus achieving a purely mechanical hard locking. This locking state does not depend on the continuous oil pressure of the hydraulic cylinder, avoiding the problem of core retraction caused by hydraulic system depressurization, and fundamentally improving the reliability and safety of the locking mechanism. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the cylinder body being ejected in the structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the retraction of the cylinder body in the structure of this utility model;

[0019] Figure 3 This is a perspective view of the slider seat in the structure of this utility model.

[0020] In the diagram: 1. Cylinder body; 2. Cylinder fixing plate; 3. Guide block; 4. Slider seat; 5. Wedge block; 6. Pressure plate; 7. Insert positioning plate; 8. Insert body; 9. Receiving cavity. Detailed Implementation

[0021] 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.

[0022] Please see Figures 1 to 3 The mold structure for preventing the hydraulic cylinder core puller from retracting in this embodiment includes a hydraulic cylinder body 1, and a locking component for preventing the core puller from retracting is provided on the outer side of the hydraulic cylinder body 1.

[0023] Please see Figure 1 In this embodiment, the locking assembly includes a cylinder fixing plate 2 fixedly connected to the outside of the cylinder body 1. Guide blocks 3 are fixedly connected to the left and right sides of the bottom of the cylinder fixing plate 2. A slider seat 4 is slidably connected between the opposite sides of the left and right guide blocks 3. Two wedge blocks 5 are provided on the inner side of the slider seat 4. A pressure plate 6 is fixedly connected to one end of the piston rod of the cylinder body 1.

[0024] Specifically, the bottom of the slider seat 4 is fixedly connected to the insert positioning plate 7, and the bottom of the insert positioning plate 7 is fixedly connected to the insert body 8.

[0025] Specifically, the pressure plate 6 is convex, and the center of the inner side of the slider seat 4 is provided with a receiving cavity 9 that is adapted to the pressure plate 6.

[0026] It should be noted that the receiving cavity 9 is not only used to receive and guide the convex pressure plate 6, but its precisely fitted structure ensures that the pressure plate 6 can only move linearly in the vertical direction without radial offset or rotation, providing a basis for the subsequent stable driving of the wedge block 5.

[0027] Specifically, the left and right sides of the inner side of the slider seat 4 are provided with grooves that communicate with the receiving cavity 9, and the two wedge blocks 5 are respectively slidably connected to the inner side of the corresponding grooves.

[0028] Specifically, the pressure plate 6 is slidably connected between the inner left and right side walls of the receiving cavity 9. The left and right sides of the bottom of the pressure plate 6 are provided with inclined surfaces. The inclined surface on the left side of the bottom of the pressure plate 6 is adapted to the wedge block 5 on the left side, and the inclined surface on the right side of the bottom of the pressure plate 6 is adapted to the wedge block 5 on the right side.

[0029] It should be noted that when the pressure plate 6 moves downward, the vertical downward force is effectively converted into a driving force that pushes the two wedge blocks 5 to move horizontally to the left and right sides through the inclined contact.

[0030] Specifically, each of the left and right guide blocks 3 has a locking groove on its opposite side that matches the wedge block 5.

[0031] Specifically, the inner side of the cylinder fixing plate 2 is provided with a piston rod extension port that is adapted to the piston rod of the cylinder body 1.

[0032] It should be noted that the piston rod extension port on the cylinder fixing plate 2 provides precise guidance and support for the cylinder piston rod, ensuring that the movement axis of the piston rod and the pressure plate 6 connected thereto is always consistent with the center line of the receiving cavity 9, preventing uneven wear or jamming caused by off-center load, and ensuring the reliability and repeatability of the entire action sequence.

[0033] The working principle of the above embodiments is as follows:

[0034] Oil flows through the cylinder body 1, and its piston rod extends downward, driving the pressure plate 6, which is fixedly connected to its end, to move downward synchronously. The pressure plate 6 slides downward in the receiving cavity of the slider seat 4. The inclined surfaces on the left and right sides of its bottom contact the inclined surfaces of the wedge blocks 5 on the left and right sides and apply a downward force. Under the action of the inclined surfaces of the pressure plate 6, the vertical downward force is decomposed into a vertical component and a horizontal component. The horizontal component pushes the left wedge block 5 to move horizontally to the left along its groove, while the right wedge block 5 moves horizontally to the right. The two wedge blocks 5 are pushed out in the horizontal direction and embedded in the locking groove on the corresponding guide block 3, thereby completing the locking. At the same time, the pressure plate 6 applies a resisting force to the two wedge blocks 5 to prevent the wedge blocks 5 from retracting, thereby strengthening the locking effect.

[0035] The installation, connection, or setting methods disclosed in this embodiment are all common mechanical connection methods, and any method that can achieve its beneficial effects can be implemented.

[0036] It should be noted that the orientations or positional relationships indicated herein are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the purpose of facilitating the description of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0037] 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 a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0038] 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 mold structure for preventing the hydraulic cylinder from retracting during core pulling, comprising a hydraulic cylinder body (1), characterized in that: The outer side of the cylinder body (1) is provided with a locking component to prevent the core puller from retracting. The locking assembly includes a cylinder fixing plate (2) fixedly connected to the outside of the cylinder body (1). Guide blocks (3) are fixedly connected to the left and right sides of the bottom of the cylinder fixing plate (2). A slider seat (4) is slidably connected between the opposite sides of the guide blocks (3) on the left and right sides. Two wedge blocks (5) are provided on the inner side of the slider seat (4). A pressure plate (6) is fixedly connected to one end of the piston rod of the cylinder body (1).

2. The mold structure for preventing the hydraulic cylinder from retracting during core pulling according to claim 1, characterized in that: The bottom of the slider seat (4) is fixedly connected to the insert positioning plate (7), and the bottom of the insert positioning plate (7) is fixedly connected to the insert body (8).

3. The mold structure for preventing the hydraulic cylinder from retracting during core pulling according to claim 1, characterized in that: The pressure plate (6) is convex, and the center of the inner side of the slider seat (4) is provided with a receiving cavity (9) that is adapted to the pressure plate (6).

4. The mold structure for preventing the hydraulic cylinder from retracting during core pulling according to claim 1, characterized in that: The left and right sides of the inner side of the slider seat (4) are provided with grooves that communicate with the receiving cavity (9), and the two wedge blocks (5) are respectively slidably connected to the inner side of the corresponding grooves.

5. The mold structure for preventing the hydraulic cylinder from retracting during core pulling according to claim 1, characterized in that: The pressure plate (6) is slidably connected between the inner left and right side walls of the receiving cavity (9), and the bottom left and right sides of the pressure plate (6) are provided with inclined surfaces.

6. The mold structure for preventing the hydraulic cylinder from retracting during core pulling according to claim 4, characterized in that: The inclined surface on the left side of the bottom of the pressure plate (6) is adapted to the wedge block (5) on the left side, and the inclined surface on the right side of the bottom of the pressure plate (6) is adapted to the wedge block (5) on the right side.

7. The mold structure for preventing the hydraulic cylinder from retracting during core pulling according to claim 1, characterized in that: The guide blocks (3) on both the left and right sides are provided with locking grooves that are compatible with the wedge blocks (5).

8. The mold structure for preventing the hydraulic cylinder from retracting after core pulling according to claim 1, characterized in that: The inner side of the cylinder fixing plate (2) is provided with a piston rod extension port that is compatible with the piston rod of the cylinder body (1).

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