A core supporting device for a sand mold

Abstract

The application discloses a moldless processing sand mold self-carrying core support device, which comprises a lower seat and an upper seat, a first screw rod is fixedly connected to the upper surface of the lower seat, a threaded cylinder is threadedly connected to the first screw rod, the threaded cylinder is rotationally connected to the upper seat through a bearing, and a fixing mechanism is arranged in the lower seat; the fixing mechanism comprises a mounting groove formed in the lower seat, a plug block is slidably connected to the lower seat through the mounting groove, the plug block is provided with a liquid passing hole and a cavity, the liquid passing hole is connected between the cavity and the outside, an annular plate is fixedly connected to the inner side wall of the liquid passing hole, a sliding plate is sealingly and slidably connected in the liquid passing hole, a plurality of springs are fixedly connected between the sliding plate and the annular plate, the plug block is provided with two third holes, and the third holes are connected between the cavity and the outside. The core support is more stable, the stable support of the sand core can be ensured, the internal components can be repeatedly used, and the manufacturing cost of the core support is lower.

Description

Technical Field

[0001] This invention relates to the field of casting technology, and in particular to a moldless sand mold with a built-in core support device. Background Technology

[0002] Sand casting is a casting method that produces castings in sand molds. Steel, iron, and most non-ferrous alloy castings can be obtained using sand casting. Because the molding materials used in sand casting are inexpensive and readily available, and the mold manufacturing is simple, it can adapt to single-piece production, batch production, and mass production of castings. For a long time, it has been a basic process in casting production. In the sand casting process, in the casting of some parts with a central hole, a sand core is generally required. The sand core is a casting component that gradually forms the central hole during the casting process. In order to ensure that the position of the sand core does not change and is stable, a core support device is generally required to support the sand core.

[0003] In existing technologies, the existing core supports are generally simple I-shaped support blocks whose height cannot be freely adjusted. Core supports of different heights need to be manufactured according to different sand core heights, which is extremely inconvenient to use. The core supports and sand molds are generally in direct contact without any connection. As a result, during the casting process, they are easily washed away by the molten metal and misaligned, which greatly reduces the support effect on the sand core. In severe cases, it can lead to the scrapping of the casting and cause unnecessary losses. Summary of the Invention

[0004] The purpose of this invention is to solve the problems in the prior art by proposing a moldless sand mold with a built-in core support device.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A moldless sand mold processing device with a self-supporting core includes a lower seat and an upper seat. A first screw is fixedly connected to the upper surface of the lower seat. A threaded cylinder is threadedly connected to the first screw. The threaded cylinder is rotatably connected to the upper seat through a bearing. A fixing mechanism is provided inside the lower seat.

[0007] The fixing mechanism includes a mounting groove in the lower seat, and a plug block is slidably connected to the lower seat through the mounting groove. The plug block has a liquid passage hole and a cavity. The liquid passage hole communicates the cavity with the outside. An annular plate is fixedly connected to the inner side wall of the liquid passage hole. A sliding plate is slidably and sealed inside the liquid passage hole. Several springs are fixedly connected between the sliding plate and the annular plate. The plug block has two third holes, which communicate the cavity with the outside. A plug rod is slidably and sealed to the lower seat through the third holes. A fixing block is fixedly connected to the bottom wall of the cavity. A second screw is fixedly connected to each of the two opposite side walls of the fixing block. The second screw is threadedly connected to the corresponding plug rod.

[0008] Furthermore, the fixing mechanism also includes two limiting grooves, which are respectively formed on two opposite inner sidewalls of the mounting groove. The lower seat is slidably connected to two limiting blocks through the limiting grooves. Each sidewall of the two limiting blocks on opposite sides is provided with a fixing groove. The limiting blocks are slidably connected to a second fixing block through the fixing groove. The lower seat has two functional cavities. A rotating shaft is rotatably connected between the two opposite inner sidewalls of the functional cavities through a bearing. The rotating shaft is interference-fitted with a toothed column. The toothed column meshes with a first rack and two second racks. The insert has two fourth holes. The fourth holes communicate the corresponding functional cavities with the outside. The first rack passes through the fourth holes, penetrates the sidewall of the insert, and extends into the fixing groove. The first rack is fixedly connected to the corresponding second fixing block. The second rack is slidably connected to the insert. An operating plate is fixedly connected to the end of the second rack located outside the insert.

[0009] Furthermore, the upper seat is provided with a force-applying mechanism, which includes a liquid chamber. The liquid chamber is opened inside the upper seat, and a pump plate is slidably connected to it in a sealed manner. Multiple connecting rods are slidably connected through the upper seat. One end of each connecting rod extends through the liquid chamber and is fixedly connected to the pump plate, while the other end extends through the outside of the upper seat and is fixedly connected to a pressure plate. The first screw has a first hole, and the lower seat has a second hole. The second hole connects the first hole to the liquid passage hole. The first screw is slidably connected to a sliding tube through the first hole. The sliding tube is fixedly connected through the upper seat and extends into the liquid chamber, which is filled with hydraulic oil.

[0010] Furthermore, an operating mechanism is provided inside the upper seat. The operating mechanism includes a drive cavity, which is opened inside the upper seat. The threaded cylinder passes through the drive cavity. A driven gear is interference-fitted to a section of the threaded cylinder located inside the drive cavity. An operating shaft is rotatably connected to the upper seat through a bearing. One end of the operating shaft extends through the drive cavity and is interference-fitted with a drive gear, while the other end extends through the outside of the upper seat and is fixedly connected to an operating block.

[0011] Furthermore, the number of teeth on the driving gear is less than the number of teeth on the driven gear.

[0012] Furthermore, the upper seat is provided with a balance hole, which connects the liquid chamber to the outside.

[0013] The present invention has the following advantages:

[0014] 1. The distance between the upper and lower seats can be freely adjusted by the cooperation of the first screw and the threaded cylinder, so that the core support can be used to support sand cores of different heights, making the use of the core support more convenient;

[0015] 2. During the placement of the core support, the pressure plate contacts the sand core, and the weight of the sand core causes the pressure plate to be pressed down, which in turn causes the pump plate to slide down. The hydraulic oil is then pumped into the mounting groove through the sliding pipe, the first hole, and the second hole, causing the insert block to slide out and insert into the sand core. Then, the hydraulic oil enters the cavity, causing the insert rod to rotate and slide out, inserting into the sand mold, thereby fixing the core support and preventing it from being knocked over or tilted during the casting process, which would affect the casting.

[0016] 3. By operating the control panel, the second rack slides down, and the first rack slides through the toothed column. This causes the first rack to slide the second fixing block out of the fixing groove, thereby releasing the fixation between the limiting block and the insert block. After casting, the limiting block and the insert block can be quickly removed, allowing the insert block and the limiting block to be reused, thus greatly reducing the manufacturing cost of the core support.

[0017] 4. By setting the drive gear and driven gear, and by setting the number of teeth of the two, the upper seat can be driven to contact the sand core and support it more easily through the control block;

[0018] 5. The insertion of the insert block and rod is achieved by applying force through the weight of the sand core itself. The insertion force can be automatically adjusted according to the weight of the sand core, thereby ensuring the stability of the core support. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a moldless sand mold with a built-in core support device proposed in this invention;

[0020] Figure 2 for Figure 1 Enlarged view of point A in the image;

[0021] Figure 3 for Figure 1 Enlarged view of point B in the image;

[0022] Figure 4 for Figure 1 A partial cross-sectional view at point CC.

[0023] In the diagram: 1 Lower seat, 2 Upper seat, 3 First screw, 4 Threaded cylinder, 5 First hole, 6 Sliding tube, 7 Liquid chamber, 8 Mounting groove, 9 Insert block, 10 Second hole, 11 Liquid passage hole, 12 Annular plate, 13 Sliding plate, 14 Spring, 15 Cavity, 16 Fixed block one, 17 Third hole, 18 Insert rod, 19 Second screw, 20 Limiting groove, 21 Limiting block, 22 Fixed groove, 23 Functional chamber, 24 Rotating shaft, 25 Gear column, 26 Fourth hole, 27 First rack, 28 Fixed block two, 29 Second rack, 30 Operating plate, 32 Connecting rod, 33 Pressure plate, 34 Pump plate, 35 Balance hole, 36 Drive chamber, 37 Driven gear, 38 Operating shaft, 39 Drive gear, 40 Operating block. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Reference Figures 1-4 A moldless sand mold processing device with a self-contained core support includes a lower seat 1 and an upper seat 2. A first screw 3 is fixedly connected to the upper surface of the lower seat 1. The first screw 3 is threadedly connected to a threaded cylinder 4. The thread rise and fall of the first screw 3 is less than the equivalent friction angle of the helical pair formed by the first screw 3 and the threaded cylinder 4, so that the threaded connection between the first screw 3 and the threaded cylinder 4 achieves self-locking and ensures the stability of the threaded connection. The threaded cylinder 4 is rotatably connected to the upper seat 2 through a bearing. A fixing mechanism is provided inside the lower seat 1. The core support lower seat 1 is placed in the cavity and in contact with the cavity wall, and then the sand core is placed. After placement, the control block 40 is operated by a wrench. The control block 40 drives the drive gear 39 to rotate through the control shaft 38. The drive gear 39 drives the driven gear 37 that meshes with it to rotate. The driven gear 37 drives the threaded cylinder 4 to rotate. The rotation of the threaded cylinder 4 is connected to the first screw 3 by a thread, which causes the upper seat 2 to move upward until the pressure plate 33 contacts the sand core. This allows the height of the core support to be freely adjusted, making the core support suitable for supporting sand cores of different heights, thus broadening the application range of the core support.

[0026] The fixing mechanism includes a mounting groove 8 formed in the lower seat 1. A plug 9 is slidably connected to the lower seat 1 via the mounting groove 8. The plug 9 has a liquid passage hole 11 and a cavity 15. The liquid passage hole 11 connects the cavity 15 to the outside. Figure 2As shown, the diameter of the liquid passage 11 increases from top to bottom, allowing the sliding plate 13 to slide down to a certain extent, thus allowing hydraulic oil to enter the cavity 15. An annular plate 12 is fixedly connected to the inner wall of the liquid passage 11, and the sliding plate 13 is slidably connected inside the liquid passage 11. Several springs 14 are fixedly connected between the sliding plate 13 and the annular plate 12. The insert block 9 has two third holes 17, which connect the cavity 15 to the outside. The lower seat 1 is slidably connected to the insert rod 18 through the third holes 17. A fixing block 16 is fixedly connected to the bottom wall of the cavity 15. The two opposite side walls of the fixing block 16 are fixedly connected to the second screws 19, which are threadedly connected to the corresponding insert rods 18. The pumping in of hydraulic oil first causes the insert block 9 to slide down, allowing the insert block 9 to insert into the sand mold, while the limiting block 21 slides down with the insert block 9 until the limiting block 21. 1. The core support slides down to the inner wall of the limiting groove 20, thus limiting the insertion block 9 and preventing it from sliding further down. At this point, the pressure is applied to the sliding plate 13, causing it to overcome the elastic force of the spring 14 and slide down until the hydraulic oil can enter the cavity 15. The hydraulic oil causes the insertion rod 18 to slide out of the third hole 17. The insertion rod 18 is then connected to the second screw 19 by a thread, causing it to rotate and slide out of the third hole 17, thus inserting the insertion rod 18 into the sand mold. It is fixed laterally by the insertion block 9 and longitudinally by the insertion rod 18, thus stably fixing the core support to the sand mold. The fixing of the insertion block 9 and the insertion rod 18 makes the core support setting more stable, thus ensuring the stability of the core support and the sand core, preventing the casting from knocking over or tilting the core support.

[0027] The fixing mechanism also includes two limiting grooves 20, which are respectively opened on two opposite inner sidewalls of the mounting groove 8. The lower seat 1 is slidably connected to two limiting blocks 21 through the limiting grooves 20. Each sidewall of the two limiting blocks 21 has a fixing groove 22. The limiting blocks 21 are slidably connected to a fixing block 28 through the fixing groove 22. The lower seat 1 has two functional cavities 23. The two opposite inner sidewalls of the functional cavities 23 are rotatably connected to a rotating shaft 24 through a bearing. The rotating shaft 24 is interference-fitted with a gear 25. The gear 25 meshes with a first rack 27 and two second racks 29. The insert block 9 has two fourth holes 26. The fourth holes 26 connect the corresponding functional cavities 23 to the outside. The first rack 27 passes through the fourth holes 26, penetrates the sidewall of the insert block 9, and extends into the fixing groove 22. The first rack 27 meshes with the corresponding fixing... The fixed block 28 is fixedly connected, and the second rack 29 is slidably connected to the insert block 9. An operating plate 30 is fixedly connected to one end of the second rack 29 outside the insert block 9. After the casting is removed, the operating plate 30 is pulled. The second rack 29 slides due to the pulling of the operating plate 30. The sliding of the second rack 29 can drive the tooth column 25 that meshes with it to rotate. The rotation of the tooth column 25 drives the first rack 27 that meshes with it to slide. The sliding of the first rack 27 drives the fixed block 28 to slide out of the fixed groove 22 and into the fourth hole 26. At this time, the fixed block 28 slides out of the fixed groove 22 and can contact the fixing of the limiting block 21 and the insert block 9. After the insert block 9 is removed, the two limiting blocks 21 are also removed. In the next casting process, the insert block 9 and the limiting block 21 can be reused, thereby reducing the manufacturing cost of the core support.

[0028] The upper seat 2 is equipped with a force-applying mechanism, which includes a liquid chamber 7. The liquid chamber 7 is located inside the upper seat 2 and is sealed and slidably connected to a pump plate 34. Multiple connecting rods 32 are slidably connected through the upper seat 2. One end of the connecting rod 32 extends through into the liquid chamber 7 and is fixedly connected to the pump plate 34. The other end extends through into the outside of the upper seat 2 and is fixedly connected to a pressure plate 33. The first screw 3 has a first hole 5, and the lower seat 1 has a second hole 10. The second hole 10 connects the first hole 5 and the liquid passage hole 11. The first screw 3 is sealed and slidably connected to a sliding tube 6 through the first hole 5. The sliding tube 6 is fixedly connected through the upper seat 2 and extends into the liquid chamber 7. The liquid chamber 7 is filled with hydraulic oil. The insertion of the insert block 9 and the insert rod 18 is performed by applying force through the weight of the sand core itself. Thus, the insertion force can be automatically adjusted according to the weight of the sand core, thereby ensuring the stability of the core support.

[0029] An operating mechanism is provided inside the upper seat 2. The operating mechanism includes a drive cavity 36, which is opened inside the upper seat 2. A threaded cylinder 4 passes through the drive cavity 36. The section of the threaded cylinder 4 located inside the drive cavity 36 is interference-fitted with a driven gear 37. The upper seat 2 is rotatably connected to an operating shaft 38 through a bearing. One end of the operating shaft 38 extends through the drive cavity 36 and is interference-fitted with a drive gear 39. The other end extends through the upper seat 2 and is fixedly connected to an operating block 40.

[0030] The number of teeth on the drive gear 39 is less than the number of teeth on the driven gear 37. By setting the number of teeth on the drive gear 39 and the driven gear 37, the drive gear 39 can drive the driven gear 37 to rotate with less effort, thereby making it easier to support the sand core.

[0031] The upper seat 2 is provided with a balance hole 35, which connects the liquid chamber 7 to the outside. The balance hole 35 ensures that the pump plate 34, which is sealed and sliding, can slide freely up and down.

[0032] In this invention, the core support lower seat 1 is placed inside the cavity and in contact with the cavity wall. Then, the sand core is placed. After placement, the operating block 40 is operated by a wrench. The operating block 40 drives the drive gear 39 to rotate through the operating shaft 38. The drive gear 39 drives the driven gear 37 meshing with it to rotate. The driven gear 37 drives the threaded cylinder 4 to rotate. The rotation of the threaded cylinder 4 is connected to the first screw 3 by a thread, causing the upper seat 2 to move upward until the pressure plate 33 contacts the sand core.

[0033] After the pressure plate 33 comes into contact with the sand core, it slides down continuously. The connecting rod 32 drives the pump plate 34 to slide down. The pump plate 34 slides down and pushes the hydraulic oil through the sliding tube 6, the first hole 5, and the second hole 10 into the liquid passage hole 11.

[0034] The pumping of hydraulic oil first causes the insert block 9 to slide down, allowing it to insert into the sand mold. The limiting block 21 then slides down along with the insert block 9 until it contacts the inner wall of the limiting groove 20, thus limiting the insert block 9 and preventing it from sliding further down. At this point, pressure is applied to the sliding plate 13, causing it to overcome the elastic force of the spring 14 and slide down until the hydraulic oil can enter the cavity 15. The hydraulic oil then causes the insert rod 18 to slide out of the third hole 17. The insert rod 18 is then connected to the second screw 19 by a thread, allowing it to rotate while sliding out of the third hole 17, thus inserting it into the sand mold. The insert block 9 fixes it laterally, and the insert rod 18 fixes it longitudinally, thus stably fixing the core support to the sand mold.

[0035] Once the casting is fixed, it can be poured through the external gating system. After pouring, the casting can be removed from the box.

[0036] After the casting is removed, the operating plate 30 is pulled. The pulling of the operating plate 30 causes the second rack 29 to slide. The sliding of the second rack 29 drives the gear column 25 that meshes with it to rotate. The rotation of the gear column 25 drives the first rack 27 that meshes with it to slide. The sliding of the first rack 27 drives the fixing block 28 to slide out of the fixing groove 22 and into the fourth hole 26. At this time, the fixing block 28 slides out of the fixing groove 22 and can contact the fixing of the limiting block 21 and the insert block 9. After the insert block 9 is removed, the two limiting blocks 21 are also removed. In the next casting process, the insert block 9 and the limiting block 21 can be reused.

[0037] After the insert block 9 and the limiting block 21 are removed, the mounting groove 8, the limiting groove 20, the first hole 5, the second hole 10, and the liquid cavity 7 are filled a second time to fill the gaps in the core support. After the second casting is completed, the outer surface of the casting is polished.

[0038] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A moldless sand mold self-supporting device, comprising a lower seat (1) and an upper seat (2), characterized in that, The upper surface of the lower seat (1) is fixedly connected to a first screw (3), and the first screw (3) is threadedly connected to a threaded cylinder (4). The threaded cylinder (4) is rotatably connected to the upper seat (2) through a bearing. A fixing mechanism is provided inside the lower seat (1). The fixing mechanism includes an installation groove (8) formed in the lower seat (1). The lower seat (1) is slidably connected to an insert (9) through the installation groove (8). The insert (9) has a liquid passage hole (11) and a cavity (15). The liquid passage hole (11) communicates the cavity (15) with the outside. An annular plate (12) is fixedly connected to the inner wall of the liquid passage hole (11). A sliding plate (13) is slidably connected to the liquid passage hole (11). The sliding plate (13) and the annular plate (12) are fixedly connected. A number of springs (14) are fixedly connected. The insert block (9) has two third holes (17). The third holes (17) connect the cavity (15) to the outside. The lower seat (1) is slidably connected to the insert rod (18) through the third holes (17). The bottom wall of the cavity (15) is fixedly connected to a first fixing block (16). The two opposite side walls of the first fixing block (16) are fixedly connected to second screws (19). The second screws (19) are threadedly connected to the corresponding insert rods (18). The upper seat (2) is provided with a force-applying mechanism, which includes a liquid chamber (7). The liquid chamber (7) is opened in the upper seat (2). A pump plate (34) is sealed and slidably connected in the liquid chamber (7). Multiple connecting rods (32) are slidably connected through the upper seat (2). One end of the connecting rod (32) extends through into the liquid chamber (7) and is fixedly connected to the pump plate (34). The other end extends through into the outside of the upper seat (2) and is fixedly connected to a pressure plate (33). The first screw (3) has a first hole (5). The lower seat (1) has a second hole (10). The second hole (10) connects the first hole (5) to the liquid passage hole (11). The first screw (3) is sealed and slidably connected to a sliding tube (6) through the first hole (5). The sliding tube (6) is fixedly connected through the upper seat (2) and extends into the liquid chamber (7). The liquid chamber (7) is filled with hydraulic oil.

2. The moldless sand mold processing device with self-supporting core according to claim 1, characterized in that, The fixing mechanism also includes two limiting grooves (20), which are respectively opened on two opposite inner sidewalls of the mounting groove (8). The lower seat (1) is slidably connected to two limiting blocks (21) through the limiting grooves (20). Each sidewall of the two limiting blocks (21) on the opposite side is provided with a fixing groove (22). The limiting blocks (21) are slidably connected to a second fixing block (28) through the fixing groove (22). The lower seat (1) has two functional cavities (23). The two opposite inner sidewalls of the functional cavities (23) are rotatably connected to a rotating shaft (24) through a bearing. The rotating shaft (24) is interference-fitted with a tooth. The column (25) meshes with a first rack (27) and two second racks (29). The insert (9) has two fourth holes (26). The fourth holes (26) connect the corresponding functional cavity (23) to the outside. The first rack (27) passes through the fourth hole (26) through the side wall of the insert (9) and extends into the fixing groove (22). The first rack (27) is fixedly connected to the corresponding fixing block (28). The second rack (29) is slidably connected to the insert (9). An operating plate (30) is fixedly connected to one end of the second rack (29) outside the insert (9).

3. The moldless sand mold self-supporting device according to claim 1, characterized in that, An operating mechanism is provided inside the upper seat (2). The operating mechanism includes a drive cavity (36), which is located inside the upper seat (2). The threaded cylinder (4) passes through the drive cavity (36). A driven gear (37) is interference-fitted to a section of the threaded cylinder (4) located inside the drive cavity (36). An operating shaft (38) is rotatably connected to the upper seat (2) through a bearing. One end of the operating shaft (38) extends through the drive cavity (36) and is interference-fitted with a drive gear (39). The other end extends through the upper seat (2) and is fixedly connected to an operating block (40).

4. The moldless sand mold self-supporting device according to claim 3, characterized in that, The number of teeth of the drive gear (39) is less than the number of teeth of the driven gear (37).

5. The moldless sand mold self-supporting device according to claim 1, characterized in that, The upper seat (2) has a balance hole (35) that connects the liquid chamber (7) to the outside.

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