Material returning mechanism of die

Abstract

The utility model discloses a material returning mechanism of a die, which comprises a bottom plate and a lower die plate arranged above the bottom plate, the top end of the lower die plate is provided with a convex die, two sides of the top end of the bottom plate are respectively provided with a support, the inner part of each support is provided with an inner concave cavity, and the convex die is arranged in the inner concave cavity. Elastic guiding pieces elastically connected with the top end of the support are installed at the corners of the bottom end of the lower die plate, a plurality of material returning rods are installed in the male die in a sliding mode, and the bottom ends of the material returning rods penetrate out of the lower die plate and are provided with double-slope-face sliding tables. Through the synergistic effect of the lower die plate, the male die, the support, the elastic guide piece, the double-slope sliding table, the material returning rod and other components, the material returning action of the die can be efficiently and stably completed, the hydraulic horizontal type single-side material returning structure can meet the higher thrust requirement through hydraulic force, the hydraulic horizontal type single-side material returning structure is particularly suitable for workpieces with large weight and complex sizes, and the working efficiency is improved. And long-time stable output can be maintained.

Description

Technical Field

[0001] This utility model relates to the field of mold technology, specifically to a mold ejection mechanism. Background Technology

[0002] The ejection mechanism of a casting mold is a key component that ensures the smooth removal of the molded workpiece from the mold. Its main functions are to improve production efficiency, protect the mold and the workpiece, and adapt to complex mold designs. The ejection mechanism, through the coordinated work of a series of components such as the ejector plate, push rod, ejector pin, slider, and springs, ensures that the workpiece can be ejected quickly and effectively after the casting process is completed. Specifically, the ejector plate, as the core component, pushes the push rod through a drive device, which in turn transmits the force to the ejector pin, directly acting on the molded workpiece to complete demolding. The design of the slider and slider guide provides additional support for workpieces with complex shapes, ensuring that they can be demolded smoothly. The spring helps the ejection mechanism reset, ensuring that the mold is in normal working condition before the next round of casting. However, at present, the ejection mechanism that relies on the spring to provide ejection power is difficult to provide enough power to lift the push rod, ejector pin and workpiece upward when facing heavy and large molded workpieces. That is, when it is necessary to lift thick or complex workpieces, the spring will be unable to overcome the static friction of the workpiece, gravity and mold adhesion resistance, resulting in incomplete ejection or failure. Utility Model Content

[0003] The purpose of this utility model is to provide a mold ejection mechanism. When the external hydraulic cylinder separates the punch on the upper mold and the lower mold plate, the cast workpiece remains on the punch. As the pressure of the hydraulic cylinder is removed, the left and right symmetrical hydraulic horizontal single-sided ejection structure causes the double-slope slide and ejection rod to move upward. Then the ejection rod pushes the workpiece remaining on the punch upward to achieve the ejection purpose, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a mold ejection mechanism, comprising a base plate and a lower template disposed above the base plate, wherein a punch is mounted on the top of the lower template, supports are mounted on both sides of the top of the base plate, and the supports are provided with concave cavities, and elastic guide members that are elastically connected to the top of the supports are installed at the corners of the bottom end of the lower template, wherein a plurality of ejection rods are slidably mounted inside the punch, the bottom ends of the plurality of ejection rods penetrate to the outside of the lower template and are mounted with double-slope slides, and a hydraulic horizontal single-sided ejection structure is provided inside the concave cavity, which slides and cooperates with the double-slope slides and forces the double-slope slides and ejection rods to move upward.

[0005] Preferably, the elastic guide includes a guide post fixed at the corner of the bottom end of the lower template and a helical spring wound around one end of the guide post surface.

[0006] Preferably, both sides of the support are provided with column cavities for the guide column to slide into, and the bottom end of the helical spring is fixedly connected to the top end of the support.

[0007] Preferably, the hydraulic horizontal single-sided ejection structure includes a pusher platform slidably installed inside the concave cavity, a baffle integrally formed on one side of the bottom end of the pusher platform, and a cross-section provided on one side of the outer wall of the pusher platform. The hydraulic horizontal single-sided ejection structure also includes hydraulic dampers installed on both sides inside the concave cavity. One end of the hydraulic damper is fixedly connected to one side of the outer wall of the baffle. The pusher platform is in contact with one side of the outer wall of the double-slope slide through the cross-section.

[0008] Preferably, a protruding tongue is provided on the outer wall of the baffle near the hydraulic damper, and a through hole is provided inside the protruding tongue. A fisheye connector is installed at the top of the piston rod of the hydraulic damper, and an internally threaded rod is installed inside the fisheye connector. The bottom end of the internally threaded rod extends through to the outside of the through hole and is fitted with a nut.

[0009] Preferably, the push platform is made of stainless steel.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows: The ejection mechanism of this mold can efficiently and stably complete the ejection action of the mold through the coordinated action of components such as the lower template, punch, support, elastic guide, double-slope slide and ejection rod. Among them, the hydraulic horizontal single-sided ejection structure can meet the higher thrust requirements through hydraulic pressure, which is especially suitable for workpieces with large weight and complex size, and can maintain stable output for a long time, avoiding the weakening of thrust due to fatigue of springs in the past. The hydraulic horizontal single-sided ejection structure only requires good maintenance, such as regular inspection of hydraulic oil and seals, and its service life is much longer than that of springs. This allows the ejection structure to work continuously under high load and high intensity conditions. Especially when facing complex mold structures and heavy workpieces, the hydraulic ejection mechanism can continuously provide reliable ejection action, avoiding downtime or failure due to spring fatigue.

[0011] The thrust of the hydraulic horizontal single-sided ejection structure can be efficiently output within a small space, thus enabling a compact design through reasonable layout. Especially when the internal space of the mold is relatively limited, the hydraulic horizontal single-sided ejection structure offers greater design flexibility. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0013] Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 1 ;

[0014] Figure 3 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 2 ;

[0015] Figure 4 This is a three-dimensional cross-sectional structural diagram of the present invention;

[0016] Figure 5 This is a three-dimensional structural diagram of the support of this utility model.

[0017] In the diagram: 1. Base plate; 2. Lower template; 3. Elastic guide; 301. Guide post; 302. Helical spring; 4. Punch; 5. Ejector rod; 6. Double-slope slide; 7. Support; 701. Concave cavity; 8. Hydraulic horizontal single-sided ejector structure; 801. Pushing platform; 802. Sectional section; 803. Baffle; 804. Hydraulic damper. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0019] Please see Figure 1-5 An embodiment of this utility model provides a mold ejection mechanism, including a base plate 1 and a lower template 2 disposed above the base plate 1. A punch 4 is installed at the top of the lower template 2. Supports 7 are installed on both sides of the top of the base plate 1. An inner cavity 701 is provided inside the support 7. An elastic guide 3 is installed at the corner of the bottom end of the lower template 2 and is elastically connected to the top of the support 7. A plurality of ejection rods 5 are slidably installed inside the punch 4. The bottom ends of the plurality of ejection rods 5 penetrate to the outside of the lower template 2 and are installed with a double-slope slide table 6. A hydraulic horizontal single-sided ejection structure 8 is provided inside the inner cavity 701, which slides and cooperates with the double-slope slide table 6 and forces the double-slope slide table 6 and ejection rods 5 to move upward.

[0020] After the punch 4 contacts and overlaps with the cavity of the upper mold, the hydraulic cylinder will cause the upper mold, punch 4, and lower template 2 to move down. Then the elastic guide 3 between the lower template 2 and the support 7 will be in a compressed state, and the double-slope slide table 6 will force the hydraulic horizontal single-sided ejection structure 8 to gradually enter the inner cavity 701.

[0021] The elastic guide 3 includes a guide post 301 fixed at the corner of the bottom end of the lower template 2 and a spiral spring 302 wound around one end of the surface of the guide post 301. Both sides of the support 7 are provided with column cavities for the guide post 301 to slide into. The bottom end of the spiral spring 302 is fixedly connected to the top end of the support 7. When the punch 4 and the upper mold are separated, the spiral spring 302 will restore its deformation and cause the lower template 2, punch 4 and guide post 301 to move upward, so as to cause the lower template 2 and the elastic guide 3 to move away from each other.

[0022] Example 2, based on Example 1, is... Figure 4 and Figure 5 The hydraulic horizontal single-sided ejection structure 8 includes a pusher 801 slidably installed inside the concave cavity 701, a baffle 803 integrally formed on one side of the bottom end of the pusher 801, and a cross-section 802 provided on one side of the outer wall of the pusher 801. The hydraulic horizontal single-sided ejection structure 8 also includes hydraulic dampers 804 installed on both sides inside the concave cavity 701. One end of the hydraulic damper 804 is fixedly connected to one side of the outer wall of the baffle 803. The pusher 801 is in contact with one side of the outer wall of the double-slope slide table 6 through the cross-section 802.

[0023] A protruding tongue is provided on the outer wall of the baffle 803 near the hydraulic damper 804. A through hole is provided inside the protruding tongue. A fisheye joint is installed at the top of the piston rod of the hydraulic damper 804. An internal thread rod is installed inside the fisheye joint. The bottom end of the internal thread rod passes through to the outside of the through hole and is fitted with a nut. The push table 801 is made of stainless steel.

[0024] Since the external force is removed from the lower template 2 and the punch 4, the hydraulic damper 804 is no longer under force, which will cause the pusher 801 to slide out of the inner cavity 701. During the sliding process of the pusher 801, the pusher 801 contacts the slope wall of the double slope slide 6 through the cross section 802, and causes the double slope slide 6 and the ejector rod 5 to move upward. In this way, the ejector rod 5 pushes out the workpiece stuck on the punch 4, thereby achieving efficient ejection action.

[0025] In this embodiment, after the lower mold plate 2 and elastic guide 3 are cast and formed with the upper mold, the pressure of the hydraulic cylinder connected to the upper mold is removed, and the hydraulic cylinder drives the upper mold to move upward, so that the downward pressure of the external hydraulic cylinder on the elastic guide 3 and lower mold plate 2 disappears. At this time, the design of the support 7, the hydraulic horizontal single-sided ejection structure 8, and the double-slope slide 6 begins to play its role. Since the two sides of the double-slope slide 6 have a certain inclined structure, the combined use of the hydraulic horizontal single-sided ejection structure 8 and the double-slope slide 6 will enable the double-slope slide 6 to effectively push the ejector rod 5 upward during the upward process. At this time, the ejector rod 5 lifts the workpiece stuck on the punch. The movement of the double-slope slide 6 and the ejector rod 5 is linear in the Z-axis direction. This mechanism ensures the workpiece remains stable during demolding, preventing damage or deformation due to excessive thrust. Simultaneously, the hydraulic horizontal single-sided ejection structure 8 provides sufficient thrust when the ejector rod 5 lifts the workpiece, until the workpiece is completely ejected from the punch 4. Finally, the double-slope slide 6 and ejector rod 5 move to their initial positions under the action of the elastic guide 3 and the hydraulic horizontal single-sided ejection structure 8, preparing for the next cycle. Compared to traditional spring ejection mechanisms, this ejection mechanism offers stronger thrust, higher control precision, longer service life, and greater adaptability. When dealing with larger and more complex workpieces, the hydraulic system provides a more stable and reliable ejection effect, reducing the risk of mold damage and incomplete workpiece demolding.

Claims

1. A material withdrawal mechanism for a mold, characterized by: The utility model provides a horizontal hydraulic unilateral material withdrawing structure, which comprises a bottom plate (1) and a lower die plate (2) arranged above the bottom plate (1), and the top end of the lower die plate (2) is provided with a punch (4); the two sides of the top end of the bottom plate (1) are provided with supports (7), and the inside of the support (7) is provided with an inner cavity (701); the corner positions of the bottom end of the lower die plate (2) are provided with elastic guide elements (3) elastically connected to the top end of the support (7); the inside of the punch (4) is slidably provided with a plurality of material withdrawing rods (5), the bottom end of the material withdrawing rod (5) penetrates to the outside of the lower die plate (2) and is provided with a double-slope surface sliding table (6), and the inside of the inner cavity (701) is provided with a hydraulic horizontal unilateral material withdrawing structure (8) which is in sliding cooperation with the double-slope surface sliding table (6) and forces the double-slope surface sliding table (6) and the material withdrawing rod (5) to move upwards.

2. A material withdrawal mechanism for a mold as defined in claim 1, wherein: The elastic guide element (3) comprises a guide column (301) fixed at the corner position of the bottom end of the lower die plate (2) and a helical spring (302) wound at one end of the surface of the guide column (301).

3. A material withdrawal mechanism for a mold as defined in claim 2, wherein: The inside of the support (7) is provided with column cavities on the two sides for the sliding entry of the guide column (301), and the bottom end of the helical spring (302) is fixedly connected to the top end of the support (7).

4. The material withdrawal mechanism of claim 1, wherein: The hydraulic horizontal unilateral material withdrawing structure (8) comprises a pushing table (801) slidably arranged in the inner cavity (701), a baffle (803) integrally formed on one side of the bottom end of the pushing table (801), a section part (802) arranged on one side of the outer wall of the pushing table (801), a hydraulic damper (804) arranged on the two sides in the inner cavity (701), one end of the hydraulic damper (804) fixedly connected to one side of the outer wall of the baffle (803), and the pushing table (801) in mutual contact with one side of the outer wall of the double-slope surface sliding table (6) through the section part (802).

5. A material withdrawal mechanism for a mold as defined in claim 4, wherein: The baffle (803) is provided with a tongue on one side of the outer wall close to the hydraulic damper (804), the inside of the tongue is provided with a through hole, the top end of the piston rod of the hydraulic damper (804) is provided with a fish eye joint, the inside of the fish eye joint is provided with an internally threaded rod, and the bottom end of the internally threaded rod penetrates to the outside of the through hole and is provided with a nut.

6. A material withdrawal mechanism for a mold as defined in claim 4, wherein: The pushing table (801) is made of a stainless steel component.

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