Hydraulic ejection device for casting mold

Abstract

The utility model belongs to the technical field of mold ejection devices, and discloses a hydraulic ejection device for a casting mold, which comprises a bottom frame arranged below a sand mold placing table, and a multi-claw moving frame arranged between the bottom frame and the sand mold placing table, a driving piece used for driving the multi-claw moving frame to move in the vertical direction is jointly arranged between the top of the multi-claw moving frame and the sand mold containing table, a limiting assembly is jointly arranged between the bottom of the multi-claw moving frame and the bottom frame, and a plurality of ejector rods are annularly arranged on the outer side of the multi-claw moving frame at equal intervals. The ejector rods extend in the vertical direction and move up and down in the vertical direction, and each ejector rod and the multi-claw moving frame are jointly provided with a connecting assembly. According to the utility model, a linkage type hydraulic rod-shaped ejection structure is adopted, so that the sand mold can be damaged to the minimum extent on the basis of quickly ejecting the casting mold, and the problem that the sand mold is damaged during drawing of the casting mold is solved.

Description

Technical Field

[0001] This utility model relates to the technical field of mold ejection devices, and in particular to a hydraulic ejection device for casting molds. Background Technology

[0002] Sand casting involves pouring molten metal into a pre-prepared sand mold, allowing it to cool and solidify to obtain a casting of the desired shape. Specifically, sand casting typically includes an upper mold and a lower mold, with the mold placed within molding sand in both molds. Each sand casting process includes steps such as filling sand, vibrating and compacting, digging molten metal channels, pouring, and removing the sand.

[0003] Patent application number 201521045330.9 discloses a mold ejection mechanism, which includes a mold body, a linear bearing, a guide post connecting plate, a cylinder connecting plate, and an ejection cylinder. The main problem with this patent is that when using this ejection mechanism to remove the casting mold, it is very easy to damage the sand mold. Utility Model Content

[0004] The main technical problem to be solved by this utility model is to provide a hydraulic ejection device for casting molds, which adopts a linkage hydraulic rod-shaped ejection structure. While quickly ejecting the casting mold, it can minimize damage to the sand mold, thus solving the problem of sand mold being damaged when the casting mold is removed.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0006] A hydraulic ejection device for casting molds includes a base frame disposed below a sand mold placement platform. A multi-jaw moving frame is disposed between the base frame and the sand mold placement platform. A driving component for driving the multi-jaw moving frame to move vertically is disposed between the top of the multi-jaw moving frame and the sand mold placement platform. A limit component is disposed between the bottom of the multi-jaw moving frame and the base frame. Multiple ejection rods are arranged in a ring at equal intervals on the outer side of the multi-jaw moving frame. All ejection rods extend vertically and move up and down vertically. Each ejection rod and the multi-jaw moving frame are connected by a connecting component.

[0007] The following are further optimizations of the above technical solution by this utility model:

[0008] The connecting assembly includes a bracket fixedly installed at the bottom of the sand mold placement platform, a V-shaped connecting arm installed on the bracket, the middle part of the V-shaped connecting arm being hinged to the bracket, the lower end of the ejector rod being rotatably and slidably installed on one end of the V-shaped connecting arm, and the other end of the V-shaped connecting arm being rotatably and slidably installed on a multi-claw moving frame.

[0009] Further optimization: The V-shaped connecting arm is provided with a second long groove through one end near the ejector rod. The lower end of the ejector rod is fixed with a second U-shaped seat. The V-shaped connecting arm is inserted between the two ends of the second U-shaped seat. A second shaft is fixed on the second U-shaped seat. The second shaft extends along the axis of the hinge shaft between the V-shaped connecting arm and the bracket. The second shaft passes through the second long groove and is movably installed inside the second long groove.

[0010] Further optimization: The multi-claw moving frame includes a horizontally arranged moving base, a driving component fixed at the center of the top of the moving base, and multiple claw arms arranged in a ring at equal intervals on the outer side of the driving component. Each claw arm corresponds to an ejector rod, and the end of the claw arm closest to the driving component is fixed to the top of the moving base.

[0011] Further optimization: A first shaft is fixed to one end of the V-shaped connecting arm near the claw arm. The first shaft extends along the axis of the hinge shaft between the V-shaped connecting arm and the bracket. A first U-shaped seat is fixed to one end of the claw arm near the ejector rod. The end of the V-shaped connecting arm near the claw arm is inserted between the two ends of the first U-shaped seat. A first long groove is provided through both ends of the first U-shaped seat. The first long groove is adapted to the first shaft. Both ends of the first shaft pass through and are movably installed in the corresponding first long groove.

[0012] Further optimization: All claw arms are L-shaped.

[0013] Further optimization: The limiting component includes a limiting post coaxially arranged with the multi-claw moving frame. The bottom of the limiting post is fixed to the base frame, and a return spring is installed between the top of the limiting post and the bottom of the multi-claw moving frame.

[0014] Further optimization: The sand mold placement platform is provided with multiple evenly distributed slots, and the upper end of each ejector rod is inserted into the corresponding slot.

[0015] The present invention adopts the above technical solution and has the following beneficial effects: The present invention adopts the above technical solution, which is ingenious in conception and reasonable in structure. It adopts a rod-shaped linkage ejection structure. Multiple discretely arranged ejection rods can quickly eject the casting mold inside the sand mold with minimal damage to the sand mold, thereby solving the problem of the casting mold damaging the sand mold when it is demolded. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art 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.

[0017] Figure 1 This is a schematic diagram of the overall structure in an embodiment of the present utility model;

[0018] Figure 2 This is a schematic diagram of the structure of the multi-claw moving frame and the limiting component in an embodiment of this utility model;

[0019] Figure 3 This is a schematic diagram of the structure in the mold-removed state in an embodiment of this utility model;

[0020] Figure 4 for Figure 3 Enlarged view of the structure at point A in the middle.

[0021] In the diagram: 1. Sand mold placement platform; 101. Empty slot; 2. Base frame; 3. Multi-claw moving frame; 301. Moving seat; 302. Claw arm; 303. First U-shaped seat; 304. First long slot; 4. Driving component; 5. Limiting assembly; 501. Limiting post; 502. Return spring; 6. Ejector rod; 601. Second U-shaped seat; 602. Second shaft; 7. Connecting assembly; 701. Bracket; 702. V-shaped connecting arm; 703. First shaft; 704. Second long slot; 8. Casting mold. 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] like Figures 1-4 As shown in the figure, a hydraulic ejection device for casting molds includes a base frame 2 disposed below a sand mold placement table 1, and a multi-claw moving frame 3 is disposed between the base frame 2 and the sand mold placement table 1.

[0024] In this embodiment, the multi-claw moving frame 3 enables the linkage control of multiple ejector rods 6, ensuring the synchronicity of the ejection action of each ejector rod 6. This avoids the situation where the casting mold 8 tilts or shifts due to asynchronous ejection actions of the ejector rods 6. A tilted or shifted casting mold 8 is very likely to damage the shape and size of the mold cavity during the process of detaching from the sand mold.

[0025] Therefore, the multi-claw moving frame 3 ensures the vertical movement of the casting mold 8 during the release process, thereby minimizing the damage of the casting mold 8 to the inner cavity of the sand mold, thus ensuring the casting quality and minimizing material waste.

[0026] The multi-claw moving frame 3 includes a horizontally arranged moving base 301. A driving member 4 is fixed at the center of the top of the moving base 301. Multiple claw arms 302 are arranged in a ring at equal intervals on the outer side of the driving member 4. Each claw arm 302 corresponds to an ejector rod 6. The end of the claw arm 302 near the driving member 4 is fixed to the top of the moving base 301.

[0027] The driving component 4 is used to drive the multi-claw moving frame 3 to move in the vertical direction, and is located between the top of the multi-claw moving frame 3 and the sand mold placement table 1.

[0028] In this embodiment, the driving component 4 can be a hydraulic cylinder. The cylinder body of the hydraulic cylinder is fixed to the top of the movable seat 301, and the piston rod end of the hydraulic cylinder presses against the bottom of the sand mold placement table 1.

[0029] In this embodiment, the hydraulic cylinder can be a commercially available model.

[0030] like Figures 1-4 As shown, a limit assembly 5 is provided between the bottom of the multi-claw moving frame 3 and the base frame 2.

[0031] The limiting component 5 includes a limiting post 501 coaxially arranged with the movable seat 301. The bottom of the limiting post 501 is fixed on the base frame 2, and a return spring 502 is installed between the top of the limiting post 501 and the bottom of the movable seat 301.

[0032] In this embodiment, the return spring 502 can be a compression spring.

[0033] like Figure 1 and Figure 2 As shown, multiple ejector rods 6 are arranged in a ring at equal intervals on the outer side of the multi-claw moving frame 3. The ejector rods 6 extend vertically and move up and down in the vertical direction. Each ejector rod 6 and the multi-claw moving frame 3 are connected by a connecting component 7.

[0034] Compared to traditional ejection structures, this invention adopts a rod-shaped linkage ejection structure. Multiple discretely arranged ejection rods can quickly eject the casting mold 8 from the sand mold with minimal damage, thus solving the problem of the casting mold 8 damaging the sand mold during demolding.

[0035] The connecting component 7 includes a bracket 701 fixedly installed at the bottom of the sand mold placement table 1. A V-shaped connecting arm 702 is installed on the bracket 701. The middle part of the V-shaped connecting arm 702 is hinged to the bracket 701. The lower end of the ejector rod 6 is rotatably and slidably installed on one end of the V-shaped connecting arm 702. The other end of the V-shaped connecting arm 702 is rotatably and slidably installed on the multi-claw moving frame 3.

[0036] Furthermore, a first shaft 703 is fixed to one end of the V-shaped connecting arm 702 near the claw arm 302. The first shaft 703 extends along the axis of the hinge shaft between the V-shaped connecting arm 702 and the bracket 701. A first U-shaped seat 303 is fixed to one end of the claw arm 302 near the ejector rod 6. The end of the V-shaped connecting arm 702 near the claw arm 302 is inserted between the two ends of the first U-shaped seat 303. A first long groove 304 is provided through both ends of the first U-shaped seat 303. The first long groove 304 is adapted to the first shaft 703. The two ends of the first shaft 703 are respectively movably installed in the corresponding first long groove 304.

[0037] The V-shaped connecting arm 702 has a second long groove 704 through one end near the ejector rod 6. The lower end of the ejector rod 6 is fixed with a second U-shaped seat 601. The V-shaped connecting arm 702 is inserted between the two ends of the second U-shaped seat 601. A second shaft 602 is fixedly installed on the second U-shaped seat 601. The second shaft 602 extends along the axial direction of the first shaft 703 and is movably installed in the second long groove 704.

[0038] In this embodiment, the first long groove 304 allows one end of the V-shaped connecting arm 702 to rotate relative to the claw arm 302, while also allowing for a small relative displacement between the two ends.

[0039] Similarly, the second long slot 704 allows the ejector rod 6 to rotate relative to the other end of the V-shaped connecting arm 702, while also allowing for a small relative displacement between the ejector rod 6 and the V-shaped connecting arm 702.

[0040] In this way, even if the V-shaped connecting arm 702 deviates horizontally at both ends during rotation, the ejector rod 6 can still move smoothly and precisely along the pre-set vertical direction, thereby minimizing damage to the sand mold while successfully achieving the ejection function.

[0041] The sand mold placement platform 1 is provided with multiple evenly distributed slots 101, and the upper end of each ejector rod 6 is inserted into the corresponding slot 101.

[0042] In this embodiment, the empty slot 101 facilitates the passage and movement of the ejector rod 6.

[0043] The process of using this invention to eject the sand mold from the casting mold 8 is as follows:

[0044] S1. Place the two sand boxes on top of the sand mold placement platform 1, and place all the ejector rods 6 inside the lower sand box.

[0045] S2. Fill a portion of molding sand into the sand box located below, so that the molding sand can cover the ejector rod 6, and then place the casting mold 8 into the sand box. At this time, the upper and lower parts of the casting mold 8 are located inside the upper and lower sand boxes respectively.

[0046] S3. Fill the two sand boxes with molding sand again, so that the molding sand completely covers the casting mold 8 and is slightly higher than the top of the upper sand box.

[0047] S4. Use vibration compaction to compact the molding sand, and add an appropriate amount of molding sand into the sand box during the compaction process, so that the molding sand is flush with the top of the sand box above.

[0048] S5. Remove the sand box located above, and then control the piston rod of the drive unit 4 to extend upward. The piston rod of the drive unit applies a thrust to the bottom of the sand mold placement table 1, and feeds back a downward counter-thrust to the moving seat 301, so that the moving seat 301 moves away from the sand mold placement table 1.

[0049] S6. The downward movement of the movable seat 301 causes the V-shaped connecting arm 702 to rotate around the hinge axis, thereby causing the ejector rod 6 to move upward in the vertical direction, pushing the casting mold 8 located in the sand box below to move upward and causing its bottom to slowly detach from the mold cavity.

[0050] S7. The workers remove the casting mold 8, which has detached from the mold cavity at the bottom, from the sand box.

[0051] After the ejection operation is completed: First, the piston rod of the drive component 4 retracts inward and disengages from the bottom of the sand mold placement table 1;

[0052] Then, under the action of the spring force of the return spring 502 itself, the return spring 502 pushes the moving seat 301 to move upward and finally return to the initial position;

[0053] At the same time, as the movable seat 301 moves upward, it drives the ejector rod 6 to move downward back to its initial position via the V-shaped connecting arm 702, ready for the next ejection action.

[0054] 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 hydraulic ejection device for casting molds, comprising a base frame (2) disposed below a sand mold placement table (1), characterized in that, A multi-claw moving frame (3) is provided between the base frame (2) and the sand mold placement platform (1). A driving component (4) for driving the multi-claw moving frame (3) to move vertically is provided between the top of the multi-claw moving frame (3) and the sand mold placement platform (1). A limit component (5) is provided between the bottom of the multi-claw moving frame (3) and the base frame (2). Multiple ejector rods (6) are arranged in a ring at equal intervals on the outside of the multi-claw moving frame (3). The ejector rods (6) all extend vertically and move up and down vertically. A connecting component (7) is installed between each ejector rod (6) and the multi-claw moving frame (3).

2. The hydraulic ejection device for a casting mold according to claim 1, characterized by The connecting assembly (7) includes a bracket (701) fixedly installed at the bottom of the sand mold placement platform (1), a V-shaped connecting arm (702) installed on the bracket (701), the middle part of the V-shaped connecting arm (702) is hinged to the bracket (701), the lower end of the ejector rod (6) is rotatably and slidably installed on one end of the V-shaped connecting arm (702), and the other end of the V-shaped connecting arm (702) is rotatably and slidably installed on the multi-claw moving frame (3).

3. The hydraulic ejection device for a casting mold according to claim 2, characterized by The V-shaped connecting arm (702) has a second long groove (704) through one end near the ejector rod (6). The lower end of the ejector rod (6) is fixed with a second U-shaped seat (601). The V-shaped connecting arm (702) is inserted between the two ends of the second U-shaped seat (601). A second shaft (602) is fixed on the second U-shaped seat (601). The second shaft (602) extends along the axis of the hinge shaft between the V-shaped connecting arm (702) and the bracket (701). The second shaft (602) passes through the second long groove (704) and is movably installed inside the second long groove (704).

4. The hydraulic ejection device for a casting mold according to claim 2, characterized by The multi-claw moving frame (3) includes a horizontally arranged moving base (301), a driving member (4) fixed at the center of the top of the moving base (301), and multiple claw arms (302) arranged in a ring at equal intervals on the outer side of the driving member (4). The claw arms (302) are arranged one-to-one with the ejector rod (6), and the end of the claw arm (302) near the driving member (4) is fixed to the top of the moving base (301).

5. The hydraulic ejection device for a casting mold according to claim 4, wherein The V-shaped connecting arm (702) is fixed with a first shaft (703) at one end near the claw arm (302). The first shaft (703) extends along the axis of the hinge shaft between the V-shaped connecting arm (702) and the bracket (701). The claw arm (302) is fixed with a first U-shaped seat (303) at one end near the ejector rod (6). The V-shaped connecting arm (702) is inserted between the two ends of the first U-shaped seat (303). The two ends of the first U-shaped seat (303) are provided with a first long groove (304). The first long groove (304) is adapted to the first shaft (703). The two ends of the first shaft (703) pass through and are movably installed in the corresponding first long groove (304).

6. The hydraulic ejection device for a casting mold according to claim 4, wherein The claw arms (302) are all L-shaped.

7. The hydraulic ejection device for casting mold according to claim 1, wherein The limiting component (5) includes a limiting post (501) coaxially arranged with the multi-claw moving frame (3). The bottom of the limiting post (501) is fixed on the base frame (2). A reset spring (502) is installed between the top of the limiting post (501) and the bottom of the multi-claw moving frame (3).

8. A hydraulic ejection device for a casting mold according to any one of claims 1 to 7, characterized in that, The sand mold placement platform (1) is provided with multiple evenly distributed slots (101), and the upper end of each ejector rod (6) is inserted into the corresponding slot (101).

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