Compaction device for sand mold casting

Abstract

The utility model belongs to the technical field of casting, and particularly relates to a compaction device for sand mold casting, which adopts the following scheme that the compaction device comprises a base, a supporting seat, two side plates and a top plate, the supporting seat is fixed on the base, a gap is formed between the base and the supporting seat, a supporting groove for supporting a sand box is formed in the top of the supporting seat, and the two side plates are fixed on the top plate. The two side plates are symmetrically arranged on the two sides of the supporting base and fixedly connected with the base, the top plate is fixed to the tops of the two side plates, and an intermittent compaction mechanism is arranged between the two side plates and located over the supporting base. According to the utility model, the flowability and the filling property of sand can be effectively improved, so that the sand can more tightly fill each corner of a model (especially a complex model), the finally obtained sand mold has higher vertical surface hardness and better uniformity, the casting molding quality of subsequent workpieces is further obviously improved, and the defects of castings are reduced.

Description

Technical Field

[0001] This utility model relates to the field of casting, and in particular to a compaction device for sand casting. 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. Currently, the production of workpieces using sand casting requires hammering and compacting the sand in the sand box to make the loose sand compacted in the sand box. If the compaction process is not handled properly, gaps will be left between the sand, which will cause noise in the cast workpiece, ultimately resulting in the workpiece not meeting the specifications and affecting sales.

[0003] A search revealed Chinese patent application CN216758079U, which discloses a compaction device for sand casting. The device is characterized by: a support frame and a hydraulic rod; upright plates on both sides of the support frame, with a horizontal plate fixedly connected between the upper surfaces of the two upright plates; a second sliding groove and a second screw on the upper horizontal plate, with a second motor sliding on the second sliding groove, the output shaft of the second motor fixedly connected to one end of the second screw, a second movable block screwed onto the second screw, and a first movable block connected to the other end of the second screw; a first motor, a bearing seat, and a first screw are fixedly mounted on the lower horizontal plate, with a bearing in the bearing seat, the output shaft of the first motor fixedly connected to one end of the first screw, and the other end of the first screw spirally passing through the first movable block and engaging with the bearing; a hydraulic rod is fixedly mounted at the lower end of the second movable block. This device avoids the drawbacks of frequently changing pressure plates to adapt to different sandbox sizes in existing technologies, thus accelerating work efficiency and improving productivity.

[0004] Existing equipment typically compacts sand by pressing it for an extended period. However, this continuous pressing process can create a "dense on top, sparse on the bottom" compaction gradient, with areas far from the pressure surface exhibiting lower compaction, which can negatively impact the casting and molding of workpieces. Utility Model Content

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

[0006] A compaction device for sand casting includes a base, a support base, two side plates, and a top plate. The support base is fixed on the base, and a gap is provided between the base and the support base. A support groove for supporting a sand box is provided on the top of the support base. The two side plates are symmetrically arranged on both sides of the support base and fixedly connected to the base. The top plate is fixed on the top of the two side plates. An intermittent compaction mechanism is provided between the two side plates, and the intermittent compaction mechanism is located directly above the support base.

[0007] The intermittent compaction mechanism includes a right rotating rod, a left rotating rod, a compaction motor, two turntables, a pin, a bushing, a push rod, and an extrusion plate. The right rotating rod and the left rotating rod are rotatably connected to the two side plates. The compaction motor is fixed to one side plate and driven by the right rotating rod. The two turntables are respectively fixed to the opposite inner sides of the right rotating rod and the left rotating rod. The pin is fixedly connected between the two turntables. The bushing is sleeved on the pin. The two ends of the push rod are movably connected to the bushing and the top of the extrusion plate, respectively.

[0008] Preferably, vertical guide grooves are provided on the inner sides of the two side plates, and guide blocks are slidably connected in the two guide grooves. The two guide blocks are respectively fixed on both sides of the extrusion plate.

[0009] Preferably, the support base has columns fixed on both sides of its top, a support plate detachably installed on the top of the column, a connecting plate fixed on the bottom of the support plate, and a pressure plate connected to the bottom of the connecting plate by an elastic element.

[0010] Preferably, the elastic element is a pressure plate spring.

[0011] Preferably, an intermittent vibration mechanism is provided at the bottom of the support base and on one side of one of the side plates, and the intermittent vibration mechanism is connected to the left rotating rod of the intermittent compaction mechanism.

[0012] Preferably, the intermittent vibration mechanism includes a first bevel gear, a second bevel gear, two supports, a shaft, an upper top block, a lower top block, a top shaft, a swing plate, and an impact block. One end of the left-hand rotating rod extends to the outside of the side plate and is fixedly connected to the second bevel gear. The shaft is rotatably connected to the two supports. The first bevel gear is fixedly sleeved on the shaft and meshes with the second bevel gear. The upper top block is fixed to the bottom of the shaft. The lower top block is movably connected to one end of the swing plate through the top shaft. The upper top block and the lower top block are in intermittent contact. The impact block is fixed to the other end of the swing plate. A through hole is provided at the bottom of the support groove, and the impact end of the impact block corresponds to the area below the through hole.

[0013] Preferably, one of the side plates has an opening at its bottom, and the pivot of the swing plate passes through the opening and is rotatably connected to the side plate.

[0014] The beneficial effects of this utility model are as follows:

[0015] 1. This utility model utilizes an intermittent compaction mechanism to intermittently compress sand. This periodic application and release of pressure facilitates the rearrangement and filling of voids by sand particles under pressure, thereby improving the overall compaction effect of the sand. Simultaneously, the high-frequency micro-vibrations generated during the intermittent compaction process effectively enhance the fluidity and filling properties of the sand, allowing it to more tightly fill every corner of the model (especially complex models). This results in a sand mold with higher vertical surface hardness and better uniformity, significantly improving the casting quality of subsequent workpieces and reducing casting defects.

[0016] 2. This utility model, through the intermittent vibration mechanism and the mechanical linkage and spatiotemporal coordination between the intermittent compaction mechanism and the intermittent vibration mechanism, can simultaneously perform efficient and coordinated compaction of molding sand from the top and bottom of the sand box. This composite compaction method greatly enhances the sand compaction process, effectively improves the final compaction effect and uniformity of the sand, and lays a solid foundation for obtaining high-quality castings. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a compaction device for sand casting proposed in this utility model;

[0018] Figure 2 This is a side view of the compaction device for sand casting proposed in this utility model;

[0019] Figure 3 This is a schematic diagram of the support structure of a compaction device for sand casting proposed in this utility model;

[0020] Figure 4 This is a schematic diagram of the intermittent pressing mechanism of a compaction device for sand casting proposed in this utility model;

[0021] Figure 5 This is a schematic diagram of the intermittent vibration mechanism of a compaction device for sand casting proposed in this utility model.

[0022] In the attached diagram: 1. Base; 2. Support base; 3. Side plate; 4. Compaction motor; 5. Top plate; 6. Intermittent compaction mechanism; 7. Intermittent vibration mechanism; 8. Guide groove; 9. Through port; 10. Support groove; 11. Through hole; 12. Left rotating rod; 13. Turntable; 14. Right rotating rod; 15. Push rod; 16. Bushing; 17. Extrusion plate; 18. Guide block; 19. Pressure plate; 20. Support column; 21. Support plate; 22. Pressure plate spring; 23. Connecting plate; 24. First bevel gear; 25. Second bevel gear; 26. Support; 27. Shaft; 28. Upper top block; 29. ​​Lower top block; 30. Top shaft; 31. Swing plate; 32. Impact block. Detailed Implementation

[0023] Example 1, referring to Figures 1-4 A compaction device for sand casting includes a base 1, a support 2, two side plates 3, and a top plate 5. The support 2 is fixed to the base 1 by welding or bolting. There is a gap between the base 1 and the support 2. The top of the support 2 has a support groove 10 for supporting a sand box. The sand box can be stably placed in the support groove 10. The two side plates 3 are symmetrically arranged on both sides of the support 2. Their bottoms are fixedly connected to the base 1, for example, by anchor bolts. The top plate 5 is fixed to the top of the two side plates 3 to form a stable frame structure. An intermittent compaction mechanism 6 is provided between the two side plates 3. The intermittent compaction mechanism 6 is located directly above the support 2.

[0024] The core of this invention lies in the fact that the intermittent compaction mechanism 6 compacts the molding sand through intermittent extrusion. In specific operation, the intermittent compaction mechanism 6 can perform intermittent extrusion on the sand. This method of periodically applying and releasing pressure is conducive to the rearrangement of sand particles and filling of voids under pressure, thereby improving the overall compaction effect of the sand. At the same time, the high-frequency micro-vibrations generated during the intermittent compaction process can effectively improve the fluidity and filling properties of the sand, allowing the sand to fill the corners of the model (especially complex models) more tightly, so that the final sand mold has higher vertical surface hardness and better uniformity, thereby significantly improving the casting quality of subsequent workpieces and reducing casting defects.

[0025] In a preferred embodiment of this utility model, the intermittent compaction mechanism 6 includes a right rotating rod 14, a left rotating rod 12, a compaction motor 4, two turntables 13, a pin, a bushing 16, a push rod 15, and a pressing plate 17. The right rotating rod 14 and the left rotating rod 12 are rotatably connected to two side plates 3 respectively via bearings or other means. The compaction motor 4 is fixed on one of the side plates 3, and its output shaft is fixedly connected to one end of the right rotating rod 14 to provide power. The two turntables 13 are respectively fixedly installed on opposite sides of the right rotating rod 14 and the left rotating rod 12. The two ends of the pin are respectively fixed to the two... At the eccentric position of the turntable 13, the bushing 16 is fitted on the pin and can rotate relative to it. The upper end of the push rod 15 is connected to the bushing 16 by a hinge or ball joint, and its lower end is connected to the top center area of ​​the extrusion plate 17 by a movable connector. When the compaction motor 4 is started, it drives the right rotating rod 14, the left rotating rod 12 and the turntable 13 to rotate synchronously. The rotational motion of the motor is converted into the reciprocating linear motion of the extrusion plate 17 in the vertical direction through the eccentrically set pin, bushing 16 and push rod 15, thereby realizing the intermittent impact compaction of the sand in the sand box below.

[0026] To ensure the smoothness and directionality of the movement of the extrusion plate 17, vertical guide grooves 8 are further provided on the opposite sides of the two side plates 3. Guide blocks 18 are slidably connected inside the two guide grooves 8. The two guide blocks 18 are fixed on both sides of the extrusion plate 17 respectively. The cooperation between the guide grooves 8 and the guide blocks 18 forms a guiding mechanism, which effectively prevents the extrusion plate 17 from swaying or rotating during reciprocating motion, and ensures the verticality and precision of the compaction action.

[0027] To simultaneously assist in compacting the upper surface edge or specific areas of the sand mold during the compaction process, support columns 20 are fixed on both sides of the top of the support base 2. Support plates 21 are detachably installed on the top of the support columns 20 by means of threads or buckles. A connecting plate 23 is fixed to the bottom of the support plate 21. A pressure plate 19 is connected to the bottom of the connecting plate 23 by an elastic element, preferably a pressure spring 22. When the extrusion plate 17 is pressed down, the pressure plate 19 can adaptively press the edge of the upper surface of the sand mold under the action of the pressure spring 22 to prevent it from loosening, and automatically reset when the extrusion plate 17 rises. This structure is particularly suitable for complex sand molds that require multi-area coordinated compaction.

[0028] Example 2, refer to Figures 1-5 A compaction device for sand casting, compared with Embodiment 1, in order to enhance the compaction effect from the bottom of the sand mold, this utility model also sets up an intermittent vibration mechanism 7 linked with the intermittent compaction mechanism 6. The intermittent vibration mechanism 7 is set at the bottom of the support base 2 and on one side of one of the side plates 3, and forms a mechanical linkage with the intermittent compaction mechanism 6. Through this design, while the device performs intermittent compaction on the top of the sand through the intermittent compaction mechanism 6, it can also periodically knock or lift the sand at the bottom of the sand box through the intermittent vibration mechanism 7, thereby forming a composite compaction effect of upper and lower coordination, which further significantly improves the overall compaction density and uniformity of the sand.

[0029] Specifically, the intermittent vibration mechanism 7 includes a first bevel gear 24, a second bevel gear 25, two supports 26, a shaft 27, an upper top block 28, a lower top block 29, a swing plate 31, and an impact block 32. One end of the left-hand rotating rod 12 extends to the outside of one of the side plates 3 and is fixedly connected to the second bevel gear 25. The first bevel gear 24 is fixedly sleeved on the shaft 27 and meshes with the second bevel gear 25, thereby transmitting the rotational power of the horizontal shaft of the intermittent compaction mechanism 6 to the vertically arranged shaft 27. Two supports 26 are fixed to the outside of the side plate 3. The shaft 27 is rotatably connected to the two supports 26 through bearings. The upper top block 28 is fixed to the bottom of the shaft 27. One end of the swing plate 31 is hinged through a rotating shaft. The side of the swing plate 31 near the upper top block 28 is movably connected to the top shaft 30. The end of the top shaft 30 is connected to the lower top block 29 through a hinge, so that the lower top block 29 can move within a certain range with the top shaft 30. The contours of the upper top block 28 and the lower top block 29 are designed to fit each other, so that the upper top block 28 can periodically lift the lower top block 29 and the top shaft 30 when rotating. The impact block 32 is fixed on the other side of the swing plate 31 (i.e., the end away from the top shaft 30). To provide space for the swing plate 31 to swing, a through-hole 9 is provided on one side of the side plate 3 corresponding to the hinge position of the swing plate 31. The hinge shaft of the swing plate 31 passes through the through-hole 9. At the same time, a through hole 11 is provided through the bottom of the support groove 10. The position of the through hole 11 corresponds to the movement trajectory of the impact block 32 when the swing plate 31 swings. During operation, the rotation of the left rotating rod 12 drives the shaft 27 to rotate through the first bevel gear 24 and the second bevel gear 25. The upper top block 28 rotates accordingly and periodically pushes up the lower top block 29. Then, through the top shaft 30, the swing plate 31 is pushed to swing around its hinge point, so that the impact block 32 at the other end of the swing plate 31 periodically hits or bumps the bottom of the sand box placed in the support groove 10 through the through hole 11, generating vibration.

[0030] In summary, this invention, through the mechanical linkage and spatiotemporal coordination between the intermittent compaction mechanism 6 and the intermittent vibration mechanism 7, can simultaneously perform efficient and coordinated compaction of molding sand from the top and bottom of the sandbox. This composite compaction method greatly enhances the sand's densification process, effectively improves the final compaction effect and uniformity of the sand, and lays a solid foundation for obtaining high-quality castings.

[0031] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A compaction device for sand casting, comprising a base (1), a support seat (2), two side plates (3) and a top plate (5), the support seat (2) is fixed on the base (1), a gap is arranged between the base (1) and the support seat (2), a support groove (10) for supporting a sand box is arranged on the top of the support seat (2), the two side plates (3) are symmetrically arranged on the two sides of the support seat (2) and are fixedly connected with the base (1), and the top plate (5) is fixed on the top of the two side plates (3), characterized in that, Intermittent compaction mechanism (6) is arranged between two side plates (3), and is located directly above support seat (2); The intermittent compaction mechanism (6) comprises a right rotating rod (14), a left rotating rod (12), a compaction motor (4), two rotating discs (13), a pin shaft, a shaft sleeve (16), a push rod (15) and an extrusion plate (17), the right rotating rod (14) and the left rotating rod (12) are rotatably connected between two side plates (3), the compaction motor (4) is fixed on one side plate (3) and is drivingly connected with the right rotating rod (14), two rotating discs (13) are respectively fixed on the opposite inner sides of the right rotating rod (14) and the left rotating rod (12), the pin shaft is fixedly connected between two rotating discs (13), the shaft sleeve (16) is sleeved on the pin shaft, and the two ends of the push rod (15) are movably connected with the shaft sleeve (16) and the top of the extrusion plate (17) respectively.

2. A compacting device for sand mould casting according to claim 1, characterised in that Vertical guide grooves (8) are formed in the opposite inner sides of two side plates (3), and guide blocks (18) are slidably connected in two guide grooves (8), and two guide blocks (18) are respectively fixed on the two sides of the extrusion plate (17).

3. A compacting device for sand mould casting according to claim 2, characterised in that Two sides of the top of the support seat (2) are fixedly provided with support columns (20), the top of each support column (20) is detachably provided with a support plate (21), the bottom of the support plate (21) is fixedly provided with a connecting plate (23), and the bottom of the connecting plate (23) is connected with a pressing plate (19) through an elastic member.

4. A compacting device for sand mould casting according to claim 3, characterised in that The elastic member is a pressing plate spring (22).

5. A compacting device for sand mould casting according to claim 2, characterised in that The bottom of the support seat (2) and one side of one side plate (3) are provided with an intermittent vibration mechanism (7), and the intermittent vibration mechanism (7) is drivingly connected with the left rotating rod (12) of the intermittent compaction mechanism (6).

6. A compacting device for sand mould casting according to claim 5, characterised in that The intermittent vibration mechanism (7) comprises a first bevel gear (24), a second bevel gear (25), two support seats (26), a shaft rod (27), an upper top block (28), a lower top block (29), a top shaft (30), a swing plate (31) and a striking block (32), one end of the left rotating rod (12) extends to the outside of the side plate (3) and is fixedly connected with the second bevel gear (25), the shaft rod (27) is rotatably connected with two support seats (26), the first bevel gear (24) is fixedly sleeved on the shaft rod (27) and is in mesh with the second bevel gear (25), the upper top block (28) is fixed on the bottom of the shaft rod (27), the lower top block (29) is movably connected with one end of the swing plate (31) through the top shaft (30), the upper top block (28) and the lower top block (29) are intermittently connected, and the striking block (32) is fixed on the other end of the swing plate (31); a through hole (11) is formed in the bottom of the support groove (10), and the striking end of the striking block (32) corresponds to the lower side of the through hole (11).

7. A compacting device for sand mould casting according to claim 6, characterised in that The bottom of one side plate (3) is provided with a through opening (9), and the rotating shaft of the swing plate (31) penetrates through the through opening (9) and is rotatably connected with the side plate (3).

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