Sand charging device for a molding machine

Abstract

The utility model relates to the sand feeding technology field of moulding machine, concretely is a sand feeding device of moulding machine, including containing frame, placing groove, screening subassembly, stirring subassembly and moulding machine main part, two -layer screen mesh alternate cleaning mechanism has guaranteed that one layer screen mesh is in normal working condition at any time, continues to supply qualified sand for moulding machine, must stop and clean when traditional screen mesh is blocked, lead to production interruption, and this device passes through the alternate operation of two -layer screen mesh, completely eliminated the downtime caused by screen mesh cleaning, effectively guarantee the continuity of production process, especially suitable for the large -scale casting production line of extremely high production efficiency requirement, the continuous and stable screening process guarantees that the sand granularity that enters moulding machine is uniform, quality is stable, and the stable sand quality is important for the forming precision and quality of casting, can effectively reduce the casting defects caused by sand quality fluctuation.

Description

Technical Field

[0001] This utility model relates to the field of molding sand feeding technology for molding machines, specifically to a molding sand feeding device for molding machines. Background Technology

[0002] As is well known, a molding machine is a casting equipment used to manufacture sand molds. Its main function is to fill sand, put loose molding sand into the sand box, compact the molding sand, and compact the loose molding sand in the sand box through different methods such as vibration, compaction, vibration pressure, and injection pressure, so that the sand mold has the necessary strength during transportation and pouring. Demolding is the process of removing the pattern from the compacted sand mold using different mechanisms. During the use of the molding machine, the sand feeding work is required.

[0003] When the equipment is screening molding sand, the screen is easily clogged. Once the screen is clogged, the machine has to be stopped to clean it. Not only does stopping the machine for cleaning interrupt the production process, but the operators also have to manually remove the accumulated molding sand from the screen bit by bit. The process is very tedious and time-consuming. Frequent machine stops for cleaning make it difficult for the equipment to work continuously and stably, which greatly reduces the overall work efficiency. Summary of the Invention

[0004] Technical problems to be solved In order to overcome the problem that existing molding machine sand feeding devices require machine shutdown to clean the screen, this utility model provides a molding machine sand feeding device that can clean the screen without stopping the machine.

[0005] Technical solution To achieve the above objectives, this utility model provides the following technical solution: a molding sand feeding device for a molding machine, comprising: Container; A placement slot is provided on the side of the holding frame; A screening component is installed in the placement slot. The screening component includes a mounting frame that is slidably disposed in the placement slot. The mounting frame has two mounting slots, one above the other. A screen is slidably disposed in each mounting slot. Sleeves are fixedly disposed on both sides of the holding frame. Sleeve rods adapted to the sleeves are fixedly disposed on both sides of the mounting frame. The sleeve rods are slidably disposed with the sleeves. Limiting components are installed on both sides of the mounting frame. A stirring assembly, the stirring assembly being mounted on top of the container frame; and The main body of the shaping machine is installed at the bottom of the holding frame.

[0006] Preferably, the limiting component includes a first sliding groove, which is formed on both sides of the mounting frame. A sliding plate is slidably disposed in the first sliding groove, and limiting posts are slidably disposed on both sides of the sliding plate. A limiting rod is fixedly disposed on the side of the screen, and the limiting rod is slidably disposed with the limiting posts.

[0007] Furthermore, one end of a first spring is fixedly disposed in the first slide groove, and the other end of the first spring is fixedly disposed with the slide plate. One end of a second spring is fixedly disposed on the limiting post, and the other end of the second spring is fixedly disposed with the slide plate.

[0008] Furthermore, sliders are fixedly provided on both sides of the screen, and a third sliding groove adapted to the sliders is opened on the side of the sleeve, and the third sliding groove is slidably disposed with the sliders.

[0009] In a further embodiment, a support column is fixedly provided on the side of the screen, and a support hole is provided in the holding frame, with the support column and the support hole being slidably disposed.

[0010] Based on the aforementioned scheme, a fourth sliding groove is provided on both sides of the top of the holding frame, a sliding block is slidably arranged in the fourth sliding groove, a horizontal plate is fixedly arranged between the tops of the sliding blocks, and a stirring column is fixedly arranged at the bottom of the horizontal plate.

[0011] Furthermore, based on the aforementioned scheme, mounting blocks are fixedly installed on both sides of the top of the holding frame, and screws are rotatably installed on the mounting blocks, with the screws connected to the horizontal plate by threads.

[0012] Furthermore, based on the aforementioned solution, a mounting plate is fixedly installed on the side of the holding frame, a motor is fixedly installed on the mounting plate, and pulleys are fixedly installed on both the output shaft of the motor and the side of the screw, with a transmission belt connecting the pulleys.

[0013] Beneficial effects The molding sand feeding device of this molding machine features a double-layer screen alternating cleaning mechanism, ensuring that one layer of screen is always in normal working condition, continuously supplying qualified molding sand to the molding machine. Traditional screens require machine shutdown for cleaning when clogged, leading to production interruptions. However, this device, through the alternating operation of the two layers of screens, completely eliminates downtime caused by screen cleaning, effectively ensuring the continuity of the production process. It is particularly suitable for large-scale casting production lines with extremely high production efficiency requirements. The continuous and stable screening process ensures that the molding sand entering the molding machine has uniform particle size and stable quality. Stable molding sand quality is crucial for the molding accuracy and quality of castings, effectively reducing casting defects caused by fluctuations in molding sand quality, increasing casting yield, reducing scrap losses, and enhancing the company's product quality and market competitiveness. Attached Figure Description

[0014] Figure 1 This is a side view of the structure of this utility model; Figure 2 This is a schematic diagram of the structure of the stirring assembly of this utility model; Figure 3 This is a schematic diagram of the structure of the support column of this utility model; Figure 4 This is a schematic diagram of the slider of this utility model; Figure 5 This is a schematic diagram of the structure of the second spring of this utility model; Figure 6 This utility model Figure 5 A magnified schematic diagram of the local structure at point A; Figure 7 This is a schematic diagram of the limiting rod of this utility model.

[0015] In the diagram: 1. Container frame; 2. Placement slot; 3. Screening component; 4. Mounting frame; 5. Mounting slot; 6. Screen; 7. Sleeve; 8. Sleeve rod; 9. Limiting component; 10. Mixing component; 11. Molding machine body; 12. First slide; 13. Slide plate; 14. Limiting column; 15. Limiting rod; 16. First spring; 17. Second spring; 18. Sliding block; 19. Third slide; 20. Support column; 21. Support hole; 22. Fourth slide; 23. Sliding block; 24. Horizontal plate; 25. Mixing column; 26. Mounting block; 27. Screw; 28. Mounting plate; 29. ​​Motor; 30. Pulley; 31. Transmission belt. Detailed Implementation

[0016] 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.

[0017] See Figures 1-7 A molding sand feeding device for a molding machine includes a holding frame 1, a placement trough 2, a screening component 3, a mixing component 10, and a molding machine body 11.

[0018] The holding frame 1 adopts a metal frame structure (material Q235B or stainless steel), and is rectangular or cylindrical in shape. It forms a large-capacity cavity inside (the volume is customized according to the molding machine's production capacity). The top opening is used to pour in molding sand, and the bottom is connected to the molding machine body 11 through a flange. The conveying rhythm of molding sand to the molding machine is controlled by a gate valve. The side has a placement groove 2 (through opening) to provide installation space for the screening component 3. The molding sand enters the screening area through the placement groove 2, and after completing the particle size classification, it falls back to the bottom of the holding frame 1.

[0019] The sleeves 7 (hollow tubular structure) on both sides are welded together with the sleeve rods 8 of the screening component 3 to provide guide support for the up and down sliding of the screening component 3. The top is equipped with a stirring component 10 mounting platform, and the stirring motor 29 and the reducer are fixed by bolts to ensure vibration buffering during stirring operation.

[0020] The mounting frame 4 is a rectangular frame structure, the size of which matches the placement groove 2. It can slide up and down along the sleeve 7 of the holding frame 1. Two horizontal mounting grooves 5 are opened on the inner side of the frame for embedding and fixing the screen 6.

[0021] The sleeve rods 8 (cylindrical rods) are welded on both sides and inserted into the sleeve 7 of the holding frame 1 to form a "sliding pair". This allows the height of the mounting frame 4 to be flexibly adjusted (such as raising it when screening coarsely and lowering it when screening finely). The screen 6 is made of wear-resistant manganese steel and is used to intercept large impurities in the molding sand (such as sand clumps and metal fragments) to ensure that there are no obvious lumps in the molding sand entering the lower layer.

[0022] Limiting components 9 are set on both sides of the mounting frame 4 to lock the position of the screen 6. The mixing component 10 is installed on the top of the container frame 1. To address the problems of molding sand easily clumping and uneven moisture content, it achieves loosening and mixing through mechanical mixing.

[0023] First, refer to Figure 6 In this embodiment, the limiting component 9 is a key component in the screening component 3 that connects the mounting frame 4 and the screen 6. Through the "double spring linkage + sliding limit" design, the problems of cumbersome bolt fixing and disassembly of the traditional screen 6 and easy loosening due to vibration are solved. During the molding sand screening process, the elasticity of the first spring 16 keeps the screen 6 and the mounting frame 4 in close contact, preventing the screen 6 from shifting due to vibration. By manually operating the limiting post 14 to compress the first spring 16, the screen 6 can be quickly disassembled without tools, improving maintenance efficiency. The elastic deformation of the first spring 16 can compensate for the assembly gap between the screen 6 and the mounting frame 4, and adapt to the wear of parts after long-term use (such as slight deformation of the screen 6 frame).

[0024] The limiting component 9 is composed of a first sliding groove 12, a sliding plate 13, a limiting post 14, a limiting rod 15, a first spring 16, and a second spring 17. The two sides of the mounting frame 4 (the sides perpendicular to the mounting groove 5 of the screen 6) are rectangular through grooves (the length of which matches the mounting groove 5 of the screen 6). The groove wall of the first sliding groove 12 is polished to ensure that the sliding plate 13 slides smoothly and to provide a sliding track for the sliding plate 13, limiting it to move only along the height direction of the mounting frame 4 (the sliding direction is perpendicular to the insertion direction of the screen 6), thus preventing misalignment of the screen 6 during installation.

[0025] A rectangular metal plate (made of Q235 or aluminum alloy) has a thickness that matches the depth of the first slide groove 12. Circular through holes are opened on both sides for installing the limiting post 14. The bottom of the slide plate 13 is fixed to the top of the first spring 16 (compression spring). The bottom of the first spring 16 is fixed to the bottom of the first slide groove 12. When the screen 6 is inserted into the mounting groove 5, the slide plate 13 is pressed down by the screen 6 and compresses the first spring 16. When the screen 6 is removed, the elastic force of the first spring 16 pushes the slide plate 13 to reset (assisting the screen 6 to pop out).

[0026] A cylindrical metal rod (made of 45# steel, chrome-plated) has one end that passes through the through hole of the slide plate 13 and extends to the inside of the mounting frame 4 (the end that contacts the screen 6), while the other end is exposed on the outside of the mounting frame 4 (for easy manual operation). The middle part of the limiting post 14 is fixed to one end of the second spring 17 (tension spring), and the other end of the second spring 17 is fixed to the side of the slide plate 13. A cylindrical protrusion (with a diameter matching the limiting post 14) is welded to the side of the screen 6 and slides in cooperation with the blind hole opened on the inner end of the limiting post 14. When the limiting post 14 is inserted into the blind hole of the limiting rod 15, the screen 6 is locked. When the limiting post 14 is pulled out, the screen 6 is unlocked.

[0027] Manually pull the limiting post 14 outward (compressing the second spring 17) to disengage the inner end of the limiting post 14 from the inner plane of the mounting frame 4. Push the screen 6 horizontally into the mounting groove 5 of the mounting frame 4 (the edge of the screen 6 slides into the mounting groove 5). The bottom edge of the screen 6 contacts the top of the sliding plate 13, pushing the sliding plate 13 downward and compressing the first spring 16 (the spring force gradually increases, providing insertion resistance feedback). When the screen 6 is fully inserted into the mounting groove 5 (the edge of the screen 6 contacts the end of the mounting groove 5), release the limiting post 14. The second spring 17 pulls the limiting post 14 inward. The blind hole at the inner end of the limiting post 14 aligns with the limiting rod 15 on the side of the screen 6 and is inserted, completing the locking. At this time, the first spring 16 is in a compressed state (storing elastic force), and the second spring 17 is in a stretched state (providing continuous locking force).

[0028] Then, refer to Figure 4In this embodiment, the sliders 18 are welded to the two sides of the screen 6 (2-4 on each side), and are made of nylon or copper alloy (hardness HB80-120). The cross-section is T-shaped or rectangular. They slide in cooperation with the third sliding groove 19 (rectangular groove) on the side of the sleeve 7. The third sliding groove 19 is opened on the outside of the sleeve 7 (parallel to the sleeve rod 8), and its length covers the sliding stroke of the screen 6. The inner wall is polished to reduce frictional resistance, limit the lateral displacement of the screen 6, and ensure that the screen 6 moves vertically along the axis of the sleeve 7 when the mounting frame 4 slides, so as to avoid the screen 6 from getting stuck in the mounting groove 5 due to tilting.

[0029] The support hole 21 is opened on the inner wall of the holding frame 1 (corresponding to the position of the support column 20). The hole diameter is larger than that of the support column 20. Molybdenum disulfide grease is applied to the support hole 21. After the screen 6 is inserted into the mounting groove 5, the support column 20 is inserted into the support hole 21 to bear the vertical load of the screen 6 (reducing the load pressure of the mounting frame 4) and at the same time restricting the vertical movement of the screen 6.

[0030] Secondly, see Figure 2 In this embodiment, the fourth chute 22 is opened on both sides of the top of the container frame 1 (along the length direction), and a high-precision linear guide rail (such as HIWINHG20) is used. The width of the fourth chute 22 matches the guide rail slider 18 at the bottom of the sliding block 23 (fitting accuracy H7 / g6). The guide rail slider 18 is installed at the bottom, and the horizontal plate 24 is fixed at the top by bolts. The spacing of the sliding blocks 23 matches the length of the horizontal plate 24 to ensure that the horizontal plate 24 remains horizontal when it moves. The horizontal plate 24 is a rectangular steel plate (the length is consistent with the top width of the container frame 1). The bottom is evenly distributed with stirring columns 25. The stirring columns 25 are cylindrical and have spiral grooves on the surface. When rotating, they can generate axial pushing force to enhance the up-and-down movement of the molding sand. The horizontal plate 24 moves laterally in the fourth chute 22 through the sliding block 23, driving the stirring columns 25 to cover different areas of the container frame 1 (such as the edge or center), solving the problem of edge mixing dead corners in traditional fixed stirring.

[0031] The screw 27 (Tr20×4 trapezoidal thread) is mounted on the mounting block 26 (welded to the top of the holding frame 1) via a deep groove ball bearing. One end of the screw 27 is machined with a handwheel interface, and the other end is connected to the pulley 30 driven by the motor 29.

[0032] Finally, see Figure 2 In this embodiment, the motor 29 is a geared motor, which is installed on the mounting plate 28 on the side of the holding frame 1. The output shaft of the motor 29 is keyed to the drive pulley 30. The driven pulley 30 is fixed to the non-handwheel end of the screw 27. Its diameter is the same as that of the drive pulley. It is driven by a rubber synchronous belt (model T10-800) with a transmission ratio of 1:1 to ensure that the speed of the screws 27 on both sides is consistent. After the motor 29 starts, the drive pulley 30 drives the driven pulleys 30 on both sides through the synchronous belt. The screws 27 rotate synchronously, and the threaded holes on both sides of the horizontal plate 24 are evenly stressed and move smoothly along the slide groove.

[0033] The pulley 30 is equipped with a torque limiter (when the movement of the horizontal plate 24 is obstructed (such as when the molding sand clumps and jams the mixing column 25), the pulley 30 slips to protect the motor 29 and avoid overload damage).

[0034] Working principle: When using the molding sand feeding device of this molding machine, the first step is to slide the frame 4 in the placement groove 2 of the holding frame 1 through the sleeve rod 8 and the sleeve 7. The upper and lower screens 6 are respectively embedded in the installation grooves 5 of the frame 4 and locked by the limiting component 9.

[0035] Molding sand is poured from the top of the holding frame 1, enters the screening component 3 through the placement trough 2, and the upper screen 6 intercepts large impurities (such as sand lumps and metal fragments). Qualified molding sand falls through the screen 6 into the lower layer, and finally the molding sand that meets the particle size requirements falls into the bottom of the holding frame 1 and is received by the molding machine body 11.

[0036] When a certain layer of screen 6 is blocked, the limiting post 14 of the operating limiting component 9 is used to compress the second spring 17, causing the limiting post 14 to disengage from the limiting rod 15 of the screen 6, thus unlocking that layer of screen 6.

[0037] The first spring 16 pushes the slide plate 13 upward, pushing the blocked screen 6 out of the mounting frame 4 along the third slide groove 19 and the support hole 21. At the same time, the unblocked screen 6 on the other side remains in working condition, ensuring that the screening process is not interrupted.

[0038] After cleaning the impurities clogging the screen 6, reinsert it into the mounting slot 5 and lock it in place using the limiting component 9 to restore the double-layer screening.

[0039] The motor 29 on the mounting plate 28 drives the screws 27 on both sides to rotate through the pulley 30 and the transmission belt 31. The horizontal plate 24 moves laterally along the fourth slide groove 22, causing the bottom stirring column 25 to reciprocate within the container frame 1.

[0040] The spiral groove design of the mixing column 25 causes the molding sand to axially tumble, eliminating dead corners in edge mixing, ensuring uniform moisture and particle size of the molding sand, and avoiding screening blockage or molding defects caused by molding sand agglomeration.

[0041] 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 molding sand feeding device for a molding machine, characterized in that, include: Container (1); Placement slot (2), the placement slot (2) is opened on the side of the holding frame (1); Screening component (3), the screening component (3) is installed in the placement slot (2), the screening component (3) includes a mounting frame (4), the mounting frame (4) is slidably disposed in the placement slot (2), the mounting frame (4) has two mounting slots (5) on the upper and lower sides, a screen (6) is slidably disposed in the mounting slot (5), sleeves (7) are fixedly disposed on both sides of the holding frame (1), and sleeve rods (8) adapted to the sleeves (7) are fixedly disposed on both sides of the mounting frame (4), the sleeve rods (8) are slidably disposed with the sleeves (7), and limit components (9) are installed on both sides of the mounting frame (4); A stirring assembly (10) is mounted on top of the container (1); and The main body of the shaping machine (11) is installed at the bottom of the holding frame (1).

2. The molding sand feeding device for the molding machine according to claim 1, characterized in that, The limiting component (9) includes a first slide groove (12), which is opened on both sides of the mounting frame (4). A slide plate (13) is slidably arranged in the first slide groove (12). Limiting posts (14) are slidably arranged on both sides of the slide plate (13). A limiting rod (15) is fixedly arranged on the side of the screen (6). The limiting rod (15) is slidably arranged with the limiting post (14).

3. The molding sand feeding device for the molding machine according to claim 2, characterized in that, One end of a first spring (16) is fixedly disposed in the first slide groove (12), and the other end of the first spring (16) is fixedly disposed with the slide plate (13). One end of a second spring (17) is fixedly disposed on the limiting post (14), and the other end of the second spring (17) is fixedly disposed with the slide plate (13).

4. The molding sand feeding device for the molding machine according to claim 1, characterized in that, The screen (6) is fixedly provided with sliders (18) on both sides, and the sleeve (7) is provided with a third sliding groove (19) that is adapted to the sliders (18) on the side. The third sliding groove (19) is slidably arranged with the sliders (18).

5. The molding sand feeding device for the molding machine according to claim 1, characterized in that, The side of the screen (6) is fixedly provided with a support column (20), and the container (1) is provided with a support hole (21). The support column (20) and the support hole (21) are slidably arranged.

6. The molding sand feeding device for the molding machine according to claim 1, characterized in that, The top two sides of the holding frame (1) are provided with a fourth sliding groove (22), and a sliding block (23) is slidably arranged in the fourth sliding groove (22). A horizontal plate (24) is fixedly arranged between the tops of the sliding blocks (23), and a stirring column (25) is fixedly arranged at the bottom of the horizontal plate (24).

7. The molding sand feeding device for the molding machine according to claim 6, characterized in that, Mounting blocks (26) are fixedly installed on both sides of the top of the holding frame (1). A screw (27) is rotatably installed on the mounting block (26). The screw (27) is connected to the horizontal plate (24) by a thread.

8. The molding sand feeding device for the molding machine according to claim 7, characterized in that, A mounting plate (28) is fixedly installed on the side of the holding frame (1), and a motor (29) is fixedly installed on the mounting plate (28). A pulley (30) is fixedly installed on the output shaft of the motor (29) and the side of the screw (27). A transmission belt (31) is provided between the pulleys (30).

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