A clamp for lost foam casting

Abstract

The utility model relates to the field of lost foam casting technology discloses a kind of fixture for lost foam casting, through first motor, double shaft and corresponding rotation part cooperation, realize sand box sectional type controllable overturning, can accurately fixed sand box at each process optimum angle, without manual assistance, improve operating efficiency and overturning stability. Its hammer vibration device is matched by second motor, push plate, rammer and spring, realizes partial material vibration, can be targeted to compact weak area inside sand box, ensure sand material uniform, material vibration frequency is adjustable, and strong adaptability, effectively reduce casting reject rate, solve the defects that existing fixture overturning controllability is poor, and material vibration effect is not good.

Description

Technical Field

[0001] This utility model relates to the field of lost foam casting technology, specifically a fixture for lost foam casting. Background Technology

[0002] Lost foam casting is a casting process in which a foam plastic mold similar in size and shape to the casting is used to create the model instead of the original mold. The model remains in place as a solid mold, and molten metal is poured into it, causing it to vaporize and replace the foam model, thus forming the desired casting. In lost foam casting, the sand box, as the core component supporting the foam model and filling it with quartz sand, directly affects the casting quality and production efficiency due to its fixation, rotation, and sand compaction. The fixture is crucial equipment for ensuring stable operation of the sand box, and it must be equipped with functions such as sand box clamping and positioning, posture adjustment, and auxiliary sand compaction.

[0003] However, existing fixtures for lost foam casting have the following drawbacks: First, the controllability of the flipping mechanism is poor. Existing flipping devices mostly flip at a single angle or continuously, failing to achieve segmented controllable flipping. During processes such as sand filling, demolding, and sand recycling, it is difficult to fix the sand box at the optimal working angle, requiring manual adjustment, which is labor-intensive and inefficient. Insufficient flipping stability can also easily lead to sand spillage and foam mold damage. Second, there is a lack of targeted local vibration structures. Traditional fixtures rely solely on overall vibration to compact the sand, making it difficult to meet the sand requirements of different areas of the sand box. This can easily result in uneven sand compaction, localized sand mold collapse, and increased casting scrap rate. The force of some vibration devices is uncontrollable and can also damage the foam mold. Manual vibration is labor-intensive and has poor consistency. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a fixture for lost foam casting, which aims to solve the above-mentioned technical problems.

[0005] A fixture for lost foam casting includes a base frame, a controllable flipping device, a clamping part, and a sand box. The base frame is connected to the clamping part through the controllable flipping device. The clamping part is provided with a clamping device for clamping the sand box. The clamping part is also provided with a hammer vibration device for locally vibrating the sand box.

[0006] The controllable flipping device includes a first motor, a first rotating shaft, a second rotating shaft, a first rotating part, and a second rotating part. The first motor controls the rotation of the first rotating shaft. The first rotating shaft is coaxially and fixedly connected to the first rotating part. The first rotating part can control the rotation of the second rotating part. The second rotating part only rotates when the first rotating part rotates to a specific angle. One end of the second rotating shaft is coaxially and fixedly connected to the second rotating part, and the other end is fixedly connected to the clamping part. The first rotating shaft is rotatably connected to the base frame.

[0007] The clamping device includes a sleeve, a control board, and an electric telescopic cylinder;

[0008] The sleeve is fixedly connected to the clamping part and sleeved with the sand box, and an insert block is slidably connected to its inner side.

[0009] The elastic part has two elastic ends that are fixedly connected to the sleeve and the insert block, respectively.

[0010] The insert has a slanted protrusion at one end and a plug-in part at the other end, which is plugged into the sand box.

[0011] The sand box is provided with a slot corresponding to the insertion part;

[0012] The top of the control panel is provided with a slope corresponding to the convex shape;

[0013] The two ends of the electric telescopic cylinder are respectively rotatably connected to the sleeve and the control plate;

[0014] The hammer vibration device includes a hammer, a spring, a second motor, and a push plate. The push plate is fixedly connected to the output shaft of the second motor. One end of the hammer is fixedly connected to one end of the spring, and the other end of the spring is fixedly connected to the clamping part. The other end of the hammer is used to impact the sand box. The hammer is provided with a protrusion corresponding to the push plate. The second motor is fixedly connected to the clamping part.

[0015] Optionally, the first rotating part includes two rings coaxial with the first rotating shaft. The rings are parallel to each other and have corresponding first and second notches. One end of the first notch and the other end corresponding to the second notch are fixedly connected to a middle plate. The second rotating part includes a cylindrical connecting part and a protruding column coaxial with the second rotating shaft. The protruding column is evenly distributed along the circumference of the side of the connecting part. The diameter of the protruding column corresponds to the distance between the two rings and can slide in the gap between the two rings.

[0016] Optionally, the hammer vibration device further includes a protective cover, which is fixedly connected to the clamping part and completely encloses the spring, the second motor and the push plate.

[0017] Optionally, the hammer vibration device further includes a guide rod, which is sleeved with a spring and fixedly connected to the hammer, and the guide rod is slidably connected to the protective cover.

[0018] Optionally, the inner wall of the slot in the sand box is provided with anti-slip texture.

[0019] Optionally, the impact end of the hammer is provided with a wear-resistant impact head, and the wear-resistant impact head is connected to the hammer by a thread.

[0020] This utility model has the following beneficial effects:

[0021] This device achieves segmented controllable rotation of the sand box through a controllable flipping mechanism. The first motor drives the first rotating shaft to rotate the first rotating part. The first rotating part only drives the second rotating part to rotate when it rotates to a specific angle. In turn, the second rotating shaft drives the clamping part and the sand box to rotate. The rotation angle of the sand box can be controlled, and the sand box can be stably fixed at the optimal angle required for different processes such as sand filling, demolding, and sand recycling, thereby improving work efficiency.

[0022] Furthermore, the hammer vibration device equipped in the clamping part enables local vibration of the sand box: the second motor drives the push plate to rotate, the push plate cooperates with the protrusion on the hammer to push the hammer to compress the spring, and when the spring returns to its original position, it drives the hammer to strike the sand box. Through repeated impact, the local sand material in the sand box is compacted, and the local area of ​​the sand material in the sand box is vibrated to reduce and avoid problems such as local sand mold collapse.

[0023] Of course, any product implementing this utility model does not necessarily need to achieve all of the above advantages at the same time. Attached Figure Description

[0024] 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.

[0025] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0026] Figure 2 This is a cross-sectional view of the internal structure of this utility model;

[0027] Figure 3 This is a schematic diagram of the controllable flipping device of this utility model;

[0028] Figure 4 This is a schematic diagram of the hammer vibration device of this utility model.

[0029] The attached diagram lists the components represented by each number as follows:

[0030] In the diagram: 1. Base frame; 2. Clamping part; 3. Sand box; 4. First motor; 5. First rotating shaft; 6. Second rotating shaft; 7. First rotating part; 71. Ring; 72. Middle plate; 73. First notch; 74. Second notch; 8. Second rotating part; 81. Cylindrical connecting part; 82. Protruding column; 9. Sleeve; 91. Electric telescopic cylinder; 10. Insert block; 101. Insertion part; 102. Oblique protrusion; 11. Elastic part; 12. Control board; 13. Hammer; 14. Spring; 15. Second motor; 16. Push plate; 17. Protrusion; 18. Guide rod; 19. Protective cover. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. 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.

[0032] Please see Figures 1-4 As shown, this utility model is a fixture for lost foam casting, including a base frame 1, a controllable flipping device, a clamping part 2 and a sand box 3. The base frame 1 is connected to the clamping part 2 through the controllable flipping device. The clamping part 2 is provided with a clamping device for clamping the sand box 3. The clamping part 2 is also provided with a hammer vibration device for locally vibrating the sand box 3.

[0033] The controllable flipping device includes a first motor 4, a first rotating shaft 5, a second rotating shaft 6, a first rotating part 7, and a second rotating part 8. The first motor 4 controls the rotation of the first rotating shaft 5. The first rotating shaft 5 is coaxially and fixedly connected to the first rotating part 7. The first rotating part 7 can control the rotation of the second rotating part 8. The second rotating part 8 will only rotate when the first rotating part 7 rotates to a specific angle. One end of the second rotating shaft 6 is coaxially and fixedly connected to the second rotating part 8, and the other end is fixedly connected to the clamping part 2. The first rotating shaft 5 is rotatably connected to the base frame 1.

[0034] The clamping device includes a sleeve 9, a control board 12, and an electric telescopic cylinder 91;

[0035] Sleeve 9 is fixedly connected to clamping part 2 and sleeved with sand box 3, and insert block 10 is slidably connected to its inner side;

[0036] The elastic part 11 has two elastic ends that are fixedly connected to the sleeve 9 and the insert block 10, respectively.

[0037] One end of the insert block 10 has a slanted protrusion 101, and the other end has an insertion part 102, which is inserted into the sand box 3.

[0038] The sand box 3 has a slot corresponding to the insertion part 102;

[0039] The top of the control panel 12 is provided with an inclined surface corresponding to the inclined protrusion 101.

[0040] The two ends of the electric telescopic cylinder 91 are rotatably connected to the sleeve 9 and the control plate 12, respectively.

[0041] Using the above-mentioned device, sleeves 9 of different thicknesses can be selected according to the actual working intensity requirements. In one embodiment, the elastic part 11 is a compression spring.

[0042] During operation, when limiting the sand box 3, first place the sand box 3 inside the clamping part 2, and slide it down along the sleeve 9. In this embodiment, as shown... Figure 3 As shown, the side of the insertion part 102 facing the clamping part 2 is an inclined surface. During the downward movement of the sand box 3, a vertical force is applied to the insertion part 102. Due to the inclined surface of the insertion part 102, the vertical force is converted into a horizontal force, thereby driving the insertion block 10 to move towards the compression elastic part 11. After the insertion part 102 is completely removed from the movement path of the sand box 3, the sand box 3 continues to move downward. When the slot corresponding to the insertion part 102 moves to the position of the insertion part 102, the insertion block 10 is affected by the elastic force of the elastic part 11, and the insertion part 102 is inserted into the slot. At the same time, the top of the sand box 3... The top of the clamping part 2 and the top of the clamping part 2 are tightly pressed together to provide support for the sand box 3, thereby limiting the sand box 3. When the insertion part 102 is inserted into the slot at the corresponding position of the sand box 3, the sand box 3 is limited. When the sand box needs to be disassembled, the control plate 12 is moved towards the inclined protrusion 101 on the sleeve 9 by controlling the electric telescopic rod 91. Due to the existence of the inclined surface, the vertical upward resultant force is decomposed into a horizontal component force, causing the insertion block 10 to move towards the compression elastic part 11, thereby driving the insertion part 102 to disengage from the corresponding slot on the sand box 3 and canceling the limitation.

[0043] When the controllable flipping device is working, the first motor 4 is started, and the first motor 4 drives the first rotating shaft 5 connected to it to rotate. Since the first rotating shaft 5 is coaxially and fixedly connected to the first rotating part 7, the first rotating part 7 rotates synchronously with the first rotating shaft 5. During the rotation of the first rotating part 7, the second rotating part 8 will only be driven to rotate when it reaches a specific angle, so as to realize the controllable adjustment of the flipping angle. When the second rotating part 8 rotates, the second rotating shaft 6, which is coaxially and fixedly connected to it, rotates synchronously. The other end of the second rotating shaft 6 is fixedly connected to the clamping part 2. Therefore, the clamping part 2 rotates together with the second rotating shaft 6, thereby driving the sand box 3 clamped by the clamping part 2 to complete the controllable flipping.

[0044] In one embodiment, such as Figure 4 As shown, the first rotating part 7 includes two rings 71 coaxial with the first rotating shaft 5. The rings 71 are parallel to each other and have corresponding first notches 73 and second notches 74. One end of the first notch 73 and the other end corresponding to the second notch 74 are fixedly connected to a middle plate 72. The second rotating part 8 includes a cylindrical connecting part 81 and a protruding post 82 coaxial with the second rotating shaft 6. The protruding post 82 is evenly distributed along the circumference of the side of the connecting part 81. The diameter of the protruding post 82 corresponds to the distance between the two rings 71 and can slide in the gap between the two rings.

[0045] The aforementioned device is driven by a first motor 4 to rotate a first rotating shaft 5. The first rotating shaft 5 drives a first rotating part 7 to rotate synchronously. At this time, the protruding column 82 slides along the gap of the ring 71. When the first rotating part 7 rotates to a preset angle, the protruding column 82 will contact the middle plate 72 and move along the middle plate 72 with the rotation of the first rotating shaft 5. At this time, the second rotating part 8 will rotate accordingly. When the protruding column 82 moves further with the middle plate 72, it will reach the second notch 73. At this time, another protruding column 82, which is adjacent to the protruding column 82, rotates with the second rotating part 8 to the first notch 72. Then, the other protruding column 82 enters the gap of the ring 71 along the middle plate and slides along the gap until the first rotating shaft 5 rotates to the preset angle again and repeats the above steps. With the above device, not only can the second rotating shaft rotate intermittently, thereby controlling the tilt angle of the sand box 3 and completing the tilting unloading of the sand box 3, but it can also stop at different sand filling angles according to process requirements. Reversing the direction of rotation of the first rotating shaft 5 can reset the sand box 3. Furthermore, the cyclic vibration of the sand box 3 can be achieved by continuously adjusting the rotation direction of the first motor 4.

[0046] The hammer vibration device includes a hammer 13, a spring 14, a second motor 15, and a push plate 16. The push plate 16 is fixedly connected to the second motor 15. One end of the hammer 13 is provided with a protrusion 17 fixedly connected to the push plate 16, and the other end is used to impact the sand box 3. The second motor 15 is fixedly connected to the clamping part 2.

[0047] The hammer vibration device moves synchronously with the clamping part 2. The second motor 15 drives the push plate 16 to rotate periodically. The push plate 16 drives the protrusion 17 to compress the spring 14. When the push plate 16 disengages from the protrusion 17, the spring 14 drives the hammer 13 to strike. When the push plate 16 rotates back to the front of the protrusion 17, it drives the protrusion 17 to compress the spring again. This cycle repeats, so that the hammer 13 continuously and locally impacts the sand box 3 to vibrate the material. This specifically improves the density of the molding sand in local areas of the sand box 3, eliminates dead corners and gaps in the sand filling, and ensures the strength and molding quality of the lost foam casting sand mold.

[0048] Optionally, the hammer vibrating device also includes a protective cover 19, which is fixedly connected to the clamping part 2 and completely encloses the spring 14, the second motor 15 and the push plate 16 to prevent casting sand particles from entering the hammer vibrating device.

[0049] The protective cover 19 is used to prevent casting sand particles from entering the hammer vibration device.

[0050] Optionally, the hammer vibration device also includes a guide rod 18, which is sleeved with a spring 14 and fixedly connected to the hammer 13. The guide rod 18 is slidably connected to the protective cover 19.

[0051] The spring 14 extends and retracts along the guide rod 18 via the aforementioned device, which increases the stability of the device.

[0052] The inner wall of the slot in sand box 3 is provided with anti-slip texture.

[0053] The impact end of the hammer 13 is equipped with a wear-resistant impact head, which is connected to the hammer 13 by a thread.

[0054] The wear-resistant impact head connected by threads can be repeatedly disassembled and replaced using the above-mentioned device, thus extending the device's lifespan.

[0055] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A fixture for lost foam casting, characterized in that, It includes a base frame (1), a controllable flipping device, a clamping part (2) and a sand box (3). The base frame (1) is connected to the clamping part (2) through the controllable flipping device. The clamping part (2) is provided with a clamping device for clamping the sand box (3). The clamping part (2) is also provided with a hammer vibration device for locally vibrating the sand box (3). The controllable flipping device includes a first motor (4), a first rotating shaft (5), a second rotating shaft (6), a first rotating part (7), and a second rotating part (8). The first motor (4) controls the rotation of the first rotating shaft (5). The first rotating shaft (5) is coaxially and fixedly connected to the first rotating part (7). The first rotating part (7) can control the rotation of the second rotating part (8). The second rotating part (8) will only rotate when the first rotating part (7) rotates to a specific angle. One end of the second rotating shaft (6) is coaxially and fixedly connected to the second rotating part (8), and the other end is fixedly connected to the clamping part (2). The first rotating shaft (5) is rotatably connected to the base frame (1). The clamping device includes a sleeve (9), a control board (12), and an electric telescopic cylinder (91). The sleeve (9) is fixedly connected to the clamping part (2) and sleeved with the sand box (3), and the insert (10) is slidably connected to its inner side. The elastic part (11) has two elastic ends that are fixedly connected to the sleeve (9) and the insert (10) respectively; The insert (10) has a slanted protrusion (101) at one end and an insertion part (102) at the other end, and the insertion part (102) is inserted into the sand box (3); The sand box (3) is provided with a slot corresponding to the insertion part (102); The top of the control panel (12) is provided with an inclined surface corresponding to the inclined protrusion (101). The electric telescopic cylinder (91) is rotatably connected at both ends to the sleeve (9) and the control plate (12), respectively; The hammer vibration device includes a hammer (13), a spring (14), a second motor (15) and a push plate (16). The push plate (16) is fixedly connected to the output shaft of the second motor (15). One end of the hammer (13) is fixedly connected to one end of the spring (14), and the other end of the spring (14) is fixedly connected to the clamping part (2). The other end of the hammer (13) is used to strike the sand box (3). The hammer (13) is provided with a protrusion (17) corresponding to the push plate (16). The second motor (15) is fixedly connected to the clamping part (2).

2. The fixture for lost foam casting according to claim 1, characterized in that, The first rotating part (7) includes two rings (71) coaxial with the first rotating shaft (5). The rings (71) are parallel to each other and have corresponding first notches (73) and second notches (74) opened in parallel. One end of the first notch (73) and the other end corresponding to the second notch (74) are fixedly connected to a middle plate (72). The second rotating part (8) includes a cylindrical connecting part (81) and a protruding column (82) coaxial with the second rotating shaft (6). The protruding column (82) is evenly distributed along the circumference of the side of the connecting part (81). The diameter of the protruding column (82) corresponds to the distance between the two rings (71) and can slide in the gap between the two rings.

3. A fixture for lost foam casting according to claim 1, characterized in that, The hammer vibration device also includes a protective cover (19), which is fixedly connected to the clamping part (2) and completely encloses the spring (14), the second motor (15) and the push plate (16).

4. A fixture for lost foam casting according to claim 3, characterized in that, The hammer vibration device also includes a guide rod (18), which is sleeved with a spring (14) and fixedly connected to the hammer (13). The guide rod (18) is slidably connected to the protective cover (19).

5. A fixture for lost foam casting according to claim 1, characterized in that, The slot inner wall of the sand box (3) is provided with anti-slip texture.

6. A fixture for lost foam casting according to claim 1, characterized in that, The impact end of the hammer (13) is provided with a wear-resistant impact head, and the wear-resistant impact head is connected to the hammer (13) by a thread.

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