Sand adding device and sand adding method for lost foam casting

Abstract

The application discloses a sand adding device and method for lost foam casting, and belongs to the technical field of casting processing. The sand adding device for lost foam casting comprises a hopper for storing molding sand, an upper sieve plate arranged at the bottom opening of the hopper and fixedly connected with the hopper, and a lower sieve plate arranged at the bottom of the upper sieve plate and capable of moving relative to the upper sieve plate in the plane where the lower sieve plate is located. When the first sieve holes on the upper sieve plate and the second sieve holes on the lower sieve plate are overlapped, the molding sand in the hopper can be released. When the lower sieve plate is moved along the direction X in FIG. 1 by a longitudinal driving unit, the number of the first sieve holes and the second sieve holes that are overlapped can be adjusted. Subsequently, when the lower sieve plate is moved along the direction Y in FIG. 1 by a transverse driving unit to align the first sieve holes and the second sieve holes, the range of sand dropping can be adjusted, thereby being beneficial to adapting to sand boxes of different sizes.

Description

Technical Field

[0001] This invention relates to the field of casting processing technology, and in particular to a sand-adding device and method for lost foam casting. Background Technology

[0002] Lost foam casting is a precision casting process based on "foam mold replacing the shape of the casting, the foam mold vaporizing and disappearing during pouring, and the molten metal filling the cavity". The sand adding device is one of the core auxiliary equipment in this process. Its core function is to uniformly and densely fill the cavity gap between the lost foam mold and the sand box with casting sand.

[0003] Currently, in industrial production, deluge sand feeders are commonly used to add molding sand into sand boxes. Their core working principle involves using a cylinder or other drive component to move one of the screen plates, causing the screen holes of two screen plates to overlap, thus allowing the molding sand to fall and exit the hopper. However, in practical applications, the coverage area of ​​the falling molding sand is difficult to adjust flexibly. When dealing with smaller sand boxes, it is necessary to disassemble and replace the screen plates with suitable ones, which is not only cumbersome and time-consuming but also limits the applicability of deluge sand feeders, failing to meet diverse sand feeding needs.

[0004] Therefore, it is necessary to provide a sand-adding device and sand-adding method for lost foam casting to solve the above-mentioned technical problems. Summary of the Invention

[0005] The purpose of this invention is to provide a sand-adding device and a sand-adding method for lost foam casting, so as to solve the technical problems mentioned in the background art.

[0006] Based on the above ideas, the present invention provides the following technical solution: a sand-adding device for lost foam casting, comprising: Hoppers are used to store molding sand. An upper screen plate is disposed at the bottom opening of the hopper and is fixedly connected to the hopper; The lower screen plate is located at the bottom of the upper screen plate and can move relative to the upper screen plate in the plane where the lower screen plate is located. When the first screen hole on the upper screen plate coincides with the second screen hole on the lower screen plate, it can release the molding sand in the hopper. The first sealing element is attached to the bottom of the lower sieve plate. Two sets of second sealing elements are provided on one side of the first sealing element. During the process of the first sealing element moving relative to the lower sieve plate to block the first sieve hole, the two sets of second sealing elements can move relative to each other to block the second sieve hole.

[0007] As a further aspect of the present invention: a transverse drive unit and a longitudinal drive unit are arranged on the outside of the hopper. The transverse drive unit and the longitudinal drive unit can move in mutually perpendicular directions in the horizontal plane, and the output ends of the transverse drive unit and the longitudinal drive unit are fixedly connected to the lower screen plate.

[0008] As a further aspect of the present invention: a top plate is provided on one side of the hopper, and the lower screen plate is connected to the top plate by a drive assembly. When the longitudinal drive unit drives the lower screen plate to move, the drive assembly can drive the first sealing member to move the same distance relative to the upper screen plate.

[0009] As a further aspect of the present invention: the second sealing member and the lower sieve plate are engaged by a guide component, and during the movement of the first sealing member relative to the lower sieve plate, the guide component can drive the two sets of second sealing members to move relative to each other.

[0010] As a further aspect of the present invention: the driving assembly includes an active rack fixedly connected to the lower sieve plate, a gear meshing at the top of the active rack, and a driven rack meshing with the gear fixed at the horizontal section of the top plate; the first sealing member is provided with a protrusion, and multiple sets of limiting strips are fixed at the top and bottom of the protrusion, and the limiting strips are attached to both sides of the top plate.

[0011] As a further aspect of the present invention: the guiding component includes a guided member fixed to the second sealing member. The guided member passes through a pre-set guiding portion on the lower sieve plate. During the movement of the first sealing member relative to the lower sieve plate, the cooperation between the guided member and the guiding portion can drive the second sealing member to move relative to the lower sieve plate to block the second sieve hole.

[0012] As a further embodiment of the present invention: a connector is fixedly provided on the top plate, and a guide plate is fixed on the side of the hopper, with the connector and the guide plate slidingly engaged.

[0013] As a further aspect of the present invention: a through groove is provided on the top plate, and the protrusion is provided through the through groove.

[0014] As a further aspect of the present invention: the guide portion is a strip groove opened on the lower sieve plate.

[0015] A sand-adding method using the aforementioned sand-adding device for lost foam casting includes the following steps: a longitudinal drive unit drives a lower screen plate to move, causing a first sealing element to block a first screen hole; when the first sealing element moves, a guide assembly drives two sets of second sealing elements to move relative to each other to block a second screen hole; a transverse drive unit drives a lower screen plate to move so that the first screen hole and the second screen hole coincide, allowing molding sand in the hopper to fall.

[0016] Compared with the prior art, the beneficial effect of the present invention is: when driven by the longitudinal driving unit along... Figure 1 When the lower sieve plate is moved in the X direction, the number of overlapping first and second sieve holes can be adjusted. Subsequently, when the transverse drive unit drives the lower sieve plate along... Figure 1 After the Y-direction is moved to align the first sieve hole with the second sieve hole, the range of sand falling can be adjusted, which is beneficial for adapting to sand boxes of different sizes. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the lower sieve plate connection structure of the present invention; Figure 3 This is a schematic diagram showing the positions of the first and second sealing elements of the present invention; Figure 4 This is a schematic diagram of the drive component structure of the present invention; Figure 5 This is a schematic diagram of the limiting component structure of the present invention; Figure 6 This is a schematic diagram showing the positions of the first and second sieve holes of the present invention; Figure 7 This is a schematic diagram of the structure of the guiding component of the present invention; Figure 8 This is a schematic diagram of the longitudinal drive unit of the present invention driving the lower sieve plate to move; Figure 9 This is a schematic diagram of the lateral drive unit of the present invention driving the lower sieve plate to move so that the first sieve hole and the second sieve hole coincide; Figure 10 This is the present invention. Figure 3 A magnified structural diagram at point A; Figure 11 This is the present invention. Figure 5 A magnified structural diagram at point B.

[0018] In the diagram: 1. Hopper; 2. Lower screen plate; 201. Second screen hole; 202. Guide part; 3. Horizontal drive unit; 4. Longitudinal drive unit; 5. Top plate; 501. Connector; 6. Guide plate; 7. Support part; 8. Slide rail; 9. Slider; 10. First seal; 1001. Limiting part; 11. Protrusion; 1101. Limiting strip; 12. Second seal; 1201. Slide bar; 13. Driven rack; 14. Gear; 15. Driving rack; 16. Upper screen plate; 1601. First screen hole; 17. Guided part; 1701. Boss; 18. Limiting roller. Detailed Implementation

[0019] like Figures 1-11 As shown, a sand feeding device for lost foam casting includes a hopper 1 and a sealing mechanism disposed at the bottom of the hopper 1. The hopper 1 is generally conical in shape and is arranged on the route of the casting sand box conveying. When the casting sand box moves to the bottom of the hopper 1, the sealing mechanism is opened so that the molding sand in the hopper 1 can fall into the sand box.

[0020] The sealing mechanism includes an upper screen plate 16 and a lower screen plate 2. Specifically, the upper screen plate 16 can be fixed at the bottom opening of the hopper 1, while the lower screen plate 2 is attached to the bottom of the upper screen plate 16. Figure 6 As shown, multiple sets of first screen holes 1601 are evenly arranged on the upper screen plate 16, while multiple sets of second screen holes 201 are correspondingly arranged on the lower screen plate 2. When the transverse drive unit 3 moves along... Figure 1 direction Y in ( Figure 1 The direction Y in Figure 8 , Figure 9 When the direction X in the middle is the same direction, the lower screen plate 2 is pushed to move so that the first screen hole 1601 is aligned with the second screen hole 201. The molding sand in the hopper 1 can fall in a "rain-like" manner. On the one hand, it is beneficial to spread the molding sand evenly in the sand box. On the other hand, it is beneficial to reduce the impact of the molding sand on the foam mold in the sand box, thereby protecting the foam mold.

[0021] In actual use, a longitudinal drive unit 4 is also installed at hopper 1 to drive the lower screen plate 2 along... Figure 1 The direction X in the middle ( Figure 1 The direction X in the middle and Figure 8 , Figure 9 (The direction Y in the middle is the same direction) move, combined Figure 6 As shown, initially, the first sieve hole 1601 and the second sieve hole 201 are along... Figure 1 The Y-direction is staggered to block the molding sand in hopper 1, when it is driven by the longitudinal drive unit 4 along... Figure 1 When the lower sieve plate 2 is moved in the X direction, the number of overlaps between the first sieve hole 1601 and the second sieve hole 201 can be adjusted. Subsequently, when the transverse drive unit 3 drives the lower sieve plate 2 along the direction of the X direction, the number of overlaps between the first sieve hole 1601 and the second sieve hole 201 can be adjusted. Figure 1 After the direction Y is moved to align the first screen hole 1601 with the second screen hole 201, the range of sand falling can be adjusted, which is beneficial for adapting to sand boxes of different sizes.

[0022] Furthermore, to facilitate the adjustment of the sand drop range, this design appropriately includes a plate-shaped first sealing element 10 and a second sealing element 12. Both the first sealing element 10 and the second sealing element 12 are attached to the bottom of the lower screen plate 2, as shown in the reference. Figure 3 As shown, the first sealing element 10 is disposed along the lower sieve plate 2. Figure 1The first seal 10 is located on the side that moves forward in the X direction, while the second seal 12 is positioned opposite to the first seal 10. Figure 1 On one side in the X direction, the second seal 12 and the first seal 10 are along Figure 1 The sliding mechanism in the Y direction and the locking mechanism in the X direction, along with the two sets of second seals 12, facilitate the sealing of the second screen holes 201 on both sides of the lower screen plate 2.

[0023] A top plate 5 is provided on one side of the hopper 1. The top plate 5 is configured such that when the longitudinal drive unit 4 drives the lower screen plate 2 along... Figure 1 When the center moves in the Y direction, it can prevent the first sealing element 10 from moving synchronously with the lower screen plate 2, and the lower screen plate 2 and the top plate 5 are connected by a drive assembly. Specifically, when the longitudinal drive unit 4 drives the lower screen plate 2 along the Y direction... Figure 1 The direction X is moved N times the hole spacing ( Figure 8 When the distance between two adjacent first screen holes 1601, the distance between two adjacent second screen holes 201, and the distance between the first screen hole 1601 and the second screen hole 201 when they do not overlap are all s), the driving assembly can drive the first sealing member 10 to move the same distance relative to the upper screen plate 16. Figure 8 As shown, in this way, when the lateral drive unit 3 moves along... Figure 1 When the lower sieve plate 2 is pushed in the direction Y to align the first sieve hole 1601 with the second sieve hole 201, the lower sieve plate 2 itself can block the bottom row of first sieve holes 1601, while the first sealing member 10 can block the top row of first sieve holes 1601. The second sealing member 12 cooperates with the lower sieve plate 2 through a guide assembly. During the movement of the first sealing member 10 relative to the lower sieve plate 2, the guide assembly can drive the two sets of second sealing members 12 to move relative to each other. Specifically, when the first sealing member 10 blocks multiple rows of first sieve holes 1601, the guide assembly can drive the second sealing members 12 to move and block the same number of second sieve holes 201. Figure 8 Detailed explanation, Figure 8 In this configuration, the first sealing element 10 blocks the first sieve hole 1601 in the first row, while two sets of second sealing elements 12 block a row of second sieve holes 201 on their sides. Figure 9 As shown, when the first sieve hole 1601 is aligned with the second sieve hole 201, the outermost part of the first sieve hole 1601 is blocked, which helps to change the sand drop range.

[0024] The driving assembly includes an active rack 15 fixedly connected to the lower screen plate 2, the active rack 15 along... Figure 1The hopper 1 is arranged in the X direction. The top of the active rack 15 is engaged with a gear 14. The gear 14 is mounted on one side of the hopper 1 by a bracket. The driven rack 13, which meshes with the gear 14, is fixed at the horizontal section of the top plate 5. The first sealing member 10 is fixed with a protrusion 11. The top and bottom of the protrusion 11 are fixed with multiple sets of limiting strips 1101. The limiting strips 1101 are attached to both sides of the top plate 5. The top plate 5 can drive the first sealing member 10 to move synchronously.

[0025] The guiding assembly includes a guided member 17 fixed to the second seal 12. The guided member 17 passes through a pre-set guide portion 202 on the lower screen plate 2. It should be noted that the guided member 17 is a rod-shaped structure, while the guide portion 202 is a strip-shaped groove opened on the lower screen plate 2. The guide portion 202 is inclined relative to the side of the lower screen plate 2, so that during the movement of the first seal 10 relative to the lower screen plate 2, the cooperation between the guided member 17 and the guide portion 202 can drive the second seal 12 along... Figure 1 The direction Y in the middle moves relative to the lower sieve plate 2 to block the second sieve hole 201.

[0026] Working principle: When the lower screen plate 2 is driven by the transverse drive unit 3 along... Figure 1 When the material moves in the Y direction, the first screen hole 1601 and the second screen hole 201 can be aligned with each other, so that the molding sand in the hopper 1 can fall in a "rain-like" manner and fill the sand box. When a smaller sand box is required, the lower screen plate 2 is first driven by the longitudinal drive unit 4 along the direction of the sand box. Figure 1 The device moves in the X direction. During this process, the driving rack 15 drives the gear 14 to rotate, and the gear 14, through meshing with the driven rack 13, drives the top plate 5 to move against the direction of travel of the lower screen plate 2. This allows the first sealing element 10 to move against the direction of travel of the lower screen plate 2 to seal the first screen hole 1601. Figures 5-9 As shown, the first seal 10 can synchronously drive the second seal 12 to move during its movement. Through the cooperation of the guided member 17 and the guide portion 202, the second seal 12 can move along the guide portion 202 as the first seal 10 moves. Figure 1 The lower sieve plate 2 moves in the Y direction to block the second sieve hole 201. Then, the lower sieve plate 2 is driven along the direction of the transverse drive unit 3. Figure 1 The first screen hole 1601 is moved in the Y direction to align with the second screen hole 201, which facilitates the discharge of molding sand from the sand box. Furthermore, the outer first screen hole 1601 is blocked, which facilitates the control of the sand drop range and can adapt to smaller sand boxes.

[0027] A slide rail 8 is fixed on the support frame for mounting the hopper 1, and sliders 9 are fixedly connected to the bottom of both the transverse drive unit 3 and the longitudinal drive unit 4. The sliders 9 slide within the slide rail 8. Through this structure, the transverse drive unit 3 can move along... Figure 1 The longitudinal drive unit 4 can move in the X direction, while the longitudinal drive unit 4 can move along the direction of the X direction. Figure 1 The Y-direction movement facilitates the movement of the lower screen plate 2 within the plane. Both the transverse drive unit 3 and the longitudinal drive unit 4 can be cylinders or hydraulic rods, etc.

[0028] Both sides of the lower screen plate 2 are provided with support members 7, and the two sides of the lower screen plate 2 are movably fitted to the inner side of the support members 7. The support members 7 are fixedly connected to the hopper 1. This structure is beneficial for... Figure 1 The lower sieve plate 2 is limited in the Z direction, so that the lower sieve plate 2 and the upper sieve plate 16 are in a state of mutual contact.

[0029] A connector 501 is fixedly installed on the top plate 5, and a guide plate 6 is fixed on the side of the hopper 1, so that the connector 501 slides in the guide groove at the bottom of the guide plate 6. It should be noted that both the guide groove and the connector 501 are T-shaped structures, thereby preventing the connector 501 from separating from the guide plate 6.

[0030] Reference Figure 4 As shown, the width of the active rack 15 is greater than the thickness of the gear 14, so that during the process of the transverse drive unit 3 driving the lower screen plate 2 to move so that the first screen hole 1601 and the second screen hole 201 coincide, the active rack 15 will not misalign with the gear 14. Furthermore, the top plate 5 is provided with a through slot for the protrusion 11 to pass through, so that during the process of the transverse drive unit 3 driving the lower screen plate 2 to move, the protrusion 11 will not interfere with the top plate 5. Of course, the top plate 5 can also be provided with a slot for the active rack 15 to pass through.

[0031] Combination Figure 5 As shown, a T-shaped limiting member 1001 is fixed on the first sealing member 10, and the limiting member 1001 passes through a pre-set positioning groove on the lower screen plate 2. Through the limiting member 1001, on the one hand, the first sealing member 10 can fit against the bottom of the lower screen plate 2; on the other hand, it can... Figure 1 The first seal 10 is limited in the Z direction. Combination Figure 3 , Figure 10 As shown, a slide bar 1201 is fixed at one end of the second sealing member 12 near the first sealing member 10. The slide bar 1201 slides in the T-shaped groove on the side of the first sealing member 10. Of course, the slide bar 1201 has a T-shaped structure, so that the first sealing member 10 can drive the second sealing member 12 to move synchronously.

[0032] Combination Figure 11 As shown, both sides of the guided member 17 are fixed with bosses 1701. The limiting rollers 18 mounted at the bottom of the bosses 1701 are in contact with the surface of the lower screen plate 2, while the limiting rollers 18 mounted on the guided member 17 are in contact with the side wall of the guide portion 202, thereby reducing the frictional force when the guided member 17 moves relative to the lower screen plate 2. Similarly, limiting rollers 18 can also be installed at the contact position between the limiting member 1001 and the lower screen plate 2 to reduce friction.

[0033] The above-disclosed examples are merely preferred embodiments of this application, intended to facilitate understanding and implementation by those skilled in the art. However, they cannot be used to limit the scope of this application. Therefore, equivalent variations made within the scope of this application are still within the scope of this application.

Claims

1. A sand-adding device for lost foam casting, characterized in that, include: Hopper (1) is used to store molding sand; The upper screen plate (16) is set at the bottom opening of the hopper (1) and is fixedly connected to the hopper (1); The lower screen plate (2) is located at the bottom of the upper screen plate (16) and can move relative to the upper screen plate (16) in the plane where the lower screen plate (2) is located. When the first screen hole (1601) on the upper screen plate (16) coincides with the second screen hole (201) on the lower screen plate (2), the molding sand in the hopper (1) can be released. The first sealing element (10) is attached to the bottom of the lower sieve plate (2). Two sets of second sealing elements (12) are provided on one side of the first sealing element (10). During the process of the first sealing element (10) moving relative to the lower sieve plate (2) to block the first sieve hole (1601), the two sets of second sealing elements (12) can move relative to each other to block the second sieve hole (201).

2. The sand-adding device for lost foam casting according to claim 1, characterized in that: The hopper (1) is provided with a transverse drive unit (3) and a longitudinal drive unit (4) on its outer side. The transverse drive unit (3) and the longitudinal drive unit (4) can move in mutually perpendicular directions in the horizontal plane, and the output ends of the transverse drive unit (3) and the longitudinal drive unit (4) are fixedly connected to the lower screen plate (2).

3. A sand-adding device for lost foam casting according to claim 2, characterized in that: The hopper (1) is provided with a top plate (5) on one side. The lower screen plate (2) and the top plate (5) are connected by a drive assembly. When the longitudinal drive unit (4) drives the lower screen plate (2) to move, the drive assembly can drive the first seal (10) to move the same distance relative to the upper screen plate (16).

4. A sand-adding device for lost foam casting according to claim 3, characterized in that: The second seal (12) and the lower sieve plate (2) are connected by a guide assembly. During the movement of the first seal (10) relative to the lower sieve plate (2), the guide assembly can drive the two sets of second seals (12) to move relative to each other.

5. A sand-adding device for lost foam casting according to claim 4, characterized in that: The drive assembly includes an active rack (15) fixedly connected to the lower screen plate (2), a gear (14) meshing at the top of the active rack (15), and a driven rack (13) meshing with the gear (14) fixed at the horizontal section of the top plate (5); a protrusion (11) is provided on the first seal (10), and multiple sets of limiting strips (1101) are fixed at the top and bottom of the protrusion (11), and the limiting strips (1101) are attached to both sides of the top plate (5).

6. A sand-adding device for lost foam casting according to claim 5, characterized in that: The guiding component includes a guided member (17) fixed to the second seal (12). The guided member (17) passes through the pre-set guide part (202) on the lower sieve plate (2). During the movement of the first seal (10) relative to the lower sieve plate (2), the cooperation between the guided member (17) and the guide part (202) can drive the second seal (12) to move relative to the lower sieve plate (2) to block the second sieve hole (201).

7. A sand-adding device for lost foam casting according to claim 3, characterized in that: A connector (501) is fixedly installed on the top plate (5), and a guide plate (6) is fixed on the side of the hopper (1). The connector (501) and the guide plate (6) are slidably engaged.

8. A sand-adding device for lost foam casting according to claim 5, characterized in that: The top plate (5) is provided with a through groove, and the protrusion (11) is provided through the through groove.

9. A sand-adding device for lost foam casting according to claim 6, characterized in that: The guide part (202) is a strip groove opened on the lower sieve plate (2).

10. A method for adding sand using a sand-adding device for lost foam casting as described in any one of claims 4-6, characterized in that, The process includes the following steps: the lower screen plate (2) is moved by the longitudinal drive unit (4) so ​​that the first sealing element (10) seals the first screen hole (1601); when the first sealing element (10) moves, the guide component can drive the two sets of second sealing elements (12) to move relative to each other to seal the second screen hole (201); the lower screen plate (2) is moved by the transverse drive unit (3) so that the first screen hole (1601) and the second screen hole (201) overlap, so that the molding sand in the hopper (1) can fall.

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