Auxiliary sand cleaning device and method for sand core molding

Abstract

The present invention relates to an auxiliary sand cleaning device and method for sand core molding, the device comprising a fixed portion, a rotating portion, and a slapping portion; the fixed portion comprising a connecting frame on which a rotary drive member is provided; the rotating portion comprising a cantilever beam, one end of the cantilever beam being connected to the output end of the rotary drive member and the other end being connected to the slapping portion; the slapping portion comprising a floating mechanism and a floating plate; the floating mechanism providing an elastic restoring force for the floating plate, enabling the floating plate to float relative to the cantilever beam after being subjected to an external force; the area of the floating plate being larger than the area of the sand shooting port of the core making mold; during operation, the connecting frame is used to connect to the sand shooting equipment, the rotary drive member is used to provide a rotational torque, and the cantilever beam is used to convert the rotational torque into a striking motion of the slapping portion, thereby enabling the floating plate to repeatedly strike the sand shooting port. The present invention can remove unsolidified coated sand in the sand core to the greatest extent, thereby improving the sand removal effect.

Description

Technical Field

[0001] The invention relates to the technical field of sand cleaning, in particular to an auxiliary sand cleaning device and method for sand core molding. Background Art

[0002] Sand cores are made from coated sand that has been cured at high temperatures within a core mold. They are used to aid in forming during casting. During sand core formation, heat is transferred from the outer wall of the hot core mold to the inner cavity. After the outer layer of the sand core solidifies into a hard shell, a large amount of uncured coated sand remains within the core (especially near the sand injection port of the core mold). Coated sand is composed of quartz sand, resin, and a curing agent. Chemicals like resins generate large amounts of gas when heated. During the casting process, the more coated sand remains within the core, the more gas is generated by heating. This gas escape can interfere with the filling of the alloy liquid, severely affecting the quality of the cast product and causing pollution and harm. Therefore, when making sand cores, it is important to remove as much uncured coated sand as possible from the core.

[0003] The current method for removing coated sand involves flipping the core mold's sand-shooting port downward and vibrating the mold. This forces the uncured coated sand in the core to flow out of the port under the influence of gravity and vibration. However, the resin in the coated sand melts due to heat, causing the sand grains to adhere to each other, resulting in poor sand removal and a large amount of sand remaining in the core. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the present invention provides an auxiliary sand cleaning device and method for sand core molding, the purpose of which is to remove the unsolidified coated sand in the sand core to the greatest extent and improve the sand removal effect.

[0005] The technical solution adopted in the present invention is as follows:

[0006] The present invention provides an auxiliary sand cleaning device for sand core molding, comprising a fixing part, a rotating part and a beating part;

[0007] The fixing portion includes a connecting frame on which a rotary driving member is provided;

[0008] The rotating part includes a cantilever beam, one end of the cantilever beam is connected to the output end of the rotating driving member, and the other end is connected to the slapping part;

[0009] The flapping part includes a floating mechanism and a floating plate; the floating mechanism provides an elastic restoring force for the floating plate, so that the floating plate can move relative to the cantilever beam after being subjected to an external force;

[0010] The area of the floating plate is larger than the sand shooting port area of the core making mold;

[0011] During operation, the connecting frame is used to connect with the sand-shooting equipment, the rotating drive member is used to provide a rotational torque, and the cantilever beam is used to convert the rotational torque into a striking motion of the flapping part, so that the floating plate can be aligned with the sand-shooting port for repeated striking.

[0012] Further technical solutions are:

[0013] The structure of the floating mechanism includes an upper fixed plate, a lower fixed plate and a sliding shaft assembly;

[0014] The upper fixed plate and the floating plate are arranged in parallel and spaced apart, with at least two sliding shaft assemblies arranged between them, and the structure of the sliding shaft assembly includes a sliding shaft and a wire spring;

[0015] The first end of the sliding shaft is passed through the upper fixed plate, and a limiting member for axial limiting is provided at the portion extending out of the upper fixed plate, and a boss is provided at the second end of the sliding shaft;

[0016] A first stepped hole is provided in the lower fixed plate, which cooperates with the first stepped surface of the boss to axially position the sliding shaft; a second stepped hole is provided in the floating plate, which cooperates with the second stepped surface of the boss to axially position the sliding shaft;

[0017] The first step surface is close to the first end of the sliding shaft, and the second step surface is close to the second end of the sliding shaft;

[0018] The boss is tightly fitted and firmly connected to the floating plate;

[0019] The wire spring is sleeved on the sliding shaft, and two ends of the wire spring are respectively in contact with the upper fixing plate and the lower fixing plate to be pre-tightened.

[0020] The outer ring of the through hole of the upper fixed plate for passing the sliding shaft is provided with a protective sleeve, which is coaxially arranged outside the sliding shaft and extends axially to limit the compression stroke of the wire spring.

[0021] The portion of the sliding shaft extending out of the upper fixing plate is provided with an external thread, and the limiting member is a nut matched with the external thread.

[0022] The cantilever beam includes a transverse plate and a longitudinal plate, and the transverse plate and the longitudinal plate are vertically connected to form an L shape;

[0023] The horizontal plate is used to connect with the output end of the rotary drive member;

[0024] The longitudinal plate is used to be connected to the upper fixing plate, and the upper fixing plate is arranged parallel to the transverse plate.

[0025] There are four sliding shaft assemblies distributed at the four corners of the beating part.

[0026] The floating plate is a rubber plate.

[0027] The rotary driving member is a rotary cylinder.

[0028] The present invention also provides an auxiliary sand cleaning method of the auxiliary sand cleaning device for sand core molding, comprising the following steps:

[0029] Connecting the sand cleaning device to the sand shooting equipment through the connecting frame so that the floating plate is perpendicular to the plane where the sand shooting port of the core making mold on the sand shooting equipment is located;

[0030] The sand shooting device adjusts the position of the core making mold so that the sand shooting port faces upward and starts core making. After the core making is completed, the sand shooting device drives the sand cleaning device and the core making mold to synchronously flip so that the sand shooting port faces downward. The sand shooting device vibrates to make the uncured coated sand in the sand core flow out from the sand shooting port, thereby forming a semi-closed cavity in the sand core.

[0031] The rotary drive member is started to drive the striking portion to rotate from the initial position to the striking position via the cantilever beam, so that the floating plate is aligned with the sand shooting port for striking;

[0032] The slapping part is controlled to rotate repeatedly by the rotary driving member, so that the floating plate repeatedly strikes the sand shooting port, so that the remaining unsolidified coated sand in the semi-enclosed cavity falls off and flows out from the sand shooting port.

[0033] Further technical solutions are:

[0034] The angle through which the slapping part rotates from the initial position to the striking position is greater than 90°.

[0035] The beneficial effects of the present invention are as follows:

[0036] This invention uses a clapping action to squeeze air into the semi-enclosed cavities within the sand core, creating a cavity effect. This structurally disrupts the uncured, but heat-adhered, coated sand, causing it to loosen and flake, thus assisting in sand cleaning. This method, in addition to vibration sand cleaning, further removes residual coated sand from the sand core, minimizing residual coated sand and effectively reducing gas emissions during the casting process.

[0037] The present invention uses a sliding shaft assembly to cause the floating plate to displace after being subjected to force, so that the floating plate is attached to the sand shooting port, thereby preventing the floating plate from being bounced away and causing ineffective striking.

[0038] The wire spring of the floating mechanism of the present invention reduces the recoil force received by the flapping part when flapping the mold, thereby effectively protecting the stability of the sand cleaning device structure.

[0039] The floating plate of the present invention can use a soft rubber plate, and the toughness of the rubber plate is used to ensure the sealing when it is in contact with the sand shooting port, so that a lower pressure area is formed in the sand shooting port area when it is quickly detached, forming a pressure difference between it and the semi-enclosed cavity in the sand core, thereby improving the sand discharge effect.

[0040] The invention has a reasonable structural design, low production cost, high degree of automation, and convenient operation. When used, it is installed on the sand shooting equipment without affecting the normal sand shooting core making process. The new device can more effectively clean the uncured coated sand in the mold cavity.

[0041] The present invention is driven by a rotating driving part, and can ensure that the sand shooting port of the mold is completely hit when corresponding to different molds, and has strong versatility.

[0042] Other features and advantages of the present invention will be set forth in the following description or may be learned by practicing the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 Schematic diagram of the three-dimensional structure of an embodiment of the present invention.

[0044] Figure 2 Schematic diagram of the structure of the sliding shaft according to an embodiment of the present invention.

[0045] Figure 3 2 is a top view of an embodiment of the present invention.

[0046] Figure 4 for Figure 3 Cross-sectional view of section AA.

[0047] Figure 5 This is a schematic diagram of the installation structure when using an embodiment of the present invention.

[0048] Figure 6 Schematic diagram of the state of the sand cleaning process in an embodiment of the present invention.

[0049] Figure 7 Schematic diagram of the structure of a semi-enclosed cavity formed during sand cleaning according to an embodiment of the present invention.

[0050] In the figure: 1. Fixed part; 2. Rotating part; 3. Beating part; 4. Core making mold; 5. Sand shooting equipment; 6. Sand core; 11. Connecting frame; 12. Rotating drive member; 21. Horizontal plate; 22. Vertical plate; 31. Upper fixed plate; 32. Lower fixed plate; 33. Floating plate; 34. Wire spring; 35. Limiting member; 36. Sliding shaft; 37. Protective cover; 41. Plane; 42. Sand shooting port; 61. Semi-enclosed cavity; 361. Boss; 3611. First step surface; 3612. Second step surface. DETAILED DESCRIPTION

[0051] The specific embodiments of the present invention are described below with reference to the accompanying drawings. Example 1

[0052] See also Figures 1 to 4 The auxiliary sand cleaning device for sand core molding of this embodiment includes a fixing part 1, a rotating part 2 and a beating part 3;

[0053] The fixing portion 1 comprises a connecting frame 11 on which a rotary driving member 12 is provided;

[0054] The rotating part 2 includes a cantilever beam, one end of which is connected to the output end of the rotating driving member 12, and the other end is connected to the slapping part 3;

[0055] The flapping part 3 includes a floating mechanism and a floating plate 33; the floating mechanism provides an elastic restoring force for the floating plate 33, so that the floating plate 33 can move relative to the cantilever beam after being subjected to an external force;

[0056] The area of the floating plate 33 is larger than the sand shooting port area of the core making mold;

[0057] During operation, the connecting frame 11 is used to connect with the sandblasting equipment, and the rotary drive member 12 is used to provide the rotary torque. Figure 1 As shown by the middle arrow, the cantilever beam is used to convert the rotational torque into the striking motion of the slapping part 3, so that the floating plate 33 can be aligned with the sand shooting port and strike repeatedly.

[0058] As a specific embodiment, the structure of the floating mechanism includes an upper fixed plate 31, a lower fixed plate 32 and a sliding shaft assembly;

[0059] The upper fixed plate 31 and the floating plate 33 are arranged in parallel and spaced apart, and at least two sliding shaft assemblies are arranged between the two. The structure of the sliding shaft assembly includes a sliding shaft 36 and a wire spring 34;

[0060] The first end of the sliding shaft 36 is passed through the upper fixed plate 31 , and a stopper 35 for axial limiting is provided at the portion extending out of the upper fixed plate 31 . The second end of the sliding shaft 36 is provided with a boss 361 .

[0061] A first stepped hole is provided in the lower fixed plate 32, which cooperates with the first stepped surface 3611 of the boss 361 to axially position the sliding shaft 36; a second stepped hole is provided in the floating plate 33, which cooperates with the second stepped surface 3612 of the boss 361 to axially position the sliding shaft 36;

[0062] The first step surface 3611 is close to the first end of the sliding shaft 36 , and the second step surface 3612 is close to the second end of the sliding shaft 36 ;

[0063] The boss 361 is tightly attached to and securely connected to the floating plate 33;

[0064] The wire spring 34 is sleeved on the sliding shaft 36 , and both ends of the wire spring 34 are respectively in contact with the upper fixing plate 31 and the lower fixing plate 32 to be pre-tightened.

[0065] like Figure 2 and Figure 4 As shown, the portion of the sliding shaft 36 extending from the upper fixing plate 31 is provided with an external thread, and the stopper 35 is a nut that cooperates with the external thread. By adjusting the locking position of the nut, the preload force of the wire spring 34 can be adjusted.

[0066] In this embodiment, the beating portion 3 beats the sand ejection port, and the floating plate 33 is subjected to external force, and together with the lower fixed plate 32 and the sliding shaft 36, it moves axially. The moving direction of the sliding shaft 36 is shown in FIG. Figure 4 As shown by the arrow in the middle. When the sliding shaft 36 moves, the wire spring 34 provides a restoring force to make the floating plate 33 reverse (i.e. Figure 4 The floating plate 33 moves in the opposite direction of the arrow in the middle, so that the floating plate 33 tightly covers the sand shooting port.

[0067] The first end of the sliding shaft 36 is limited in axial position by the stopper 35 to prevent it from falling off the upper fixed plate 31. The second end of the sliding shaft 36 is engaged with the lower fixed plate 32 and the floating plate 33 through the boss 361, so that the three are integrated.

[0068] In a preferred embodiment, to protect the wire spring 34, a protective sleeve 37 is provided around the outer ring of the through-hole in the upper fixing plate 31, through which the sliding shaft 36 passes. This sleeve 37 is coaxially disposed outside the sliding shaft 36 and extends axially to limit the compression stroke of the wire spring 34. When the bottom end of the sleeve 37 contacts the lower fixing plate 32, the wire spring 34 reaches its minimum compression distance, thereby preventing overcompression.

[0069] As a preferred embodiment, the floating plate 33 is made of a soft material, specifically a rubber plate. The soft rubber plate has toughness, and when the beating part 3 hits, the floating plate 33 can be completely fitted with the sand shooting port.

[0070] The cantilever beam includes a transverse plate 21 and a longitudinal plate 22, and the transverse plate 21 and the longitudinal plate 22 are vertically connected to form an L shape;

[0071] The horizontal plate 21 is used to connect to the output end of the rotary drive member 12;

[0072] The longitudinal plate 22 is used to connect with the upper fixing plate 31 , and the upper fixing plate 31 is arranged parallel to the transverse plate 21 .

[0073] The rotary driving component 12 is a rotary cylinder.

[0074] Specifically, the horizontal plate 21 is an L-shaped sheet metal, and the vertical plate 22 is a rectangular sheet metal. The short side of the L-shaped sheet metal is fixed to the rotating surface of the rotary drive member 12, and the two rectangular sheet metals are installed on the outside of the long side.

[0075] As a preferred embodiment, four sliding shaft assemblies are provided, distributed at the four corners of the flapping portion 3, to ensure that the upper and lower fixing plates are parallel to each other to the greatest extent.

[0076] Among them, the connecting frame 11 is a T-shaped sheet metal part, the rotating drive part 12 is fixed on one side of the connecting frame 11, and the other side of the connecting frame 11 can be used to connect with the sand shooting equipment.

[0077] Example 2

[0078] This embodiment provides an auxiliary sand cleaning method of the auxiliary sand cleaning device for sand core molding according to embodiment 1, comprising the following steps:

[0079] Step 1: See Figure 5 , connect the sand cleaning device to the sand shooting device 5 through the connecting frame 11, so that the floating plate 33 is perpendicular to the plane 41 where the sand shooting port 42 of the core making mold 4 on the sand shooting device 5 is located;

[0080] Step 2: Adjust the position of the core making mold 4 with the sand shooting equipment 5 so that the sand shooting port faces upwards. Figure 6 As shown in (a), core making begins;

[0081] Step 3: After the core is made, the sand shooting device 5 drives the sand cleaning device and the core making mold 4 to turn over synchronously so that the sand shooting port faces downward. Figure 6 As shown in (b); the sand shooting device 5 vibrates, causing the uncured coated sand in the sand core 6 to flow out from the sand shooting port, thereby forming a semi-enclosed cavity 61 in the sand core 6, as shown in FIG. Figure 7 As shown;

[0082] Step 4: Start the rotary drive 12, which drives the beating part 3 to rotate from the initial position to the striking position through the cantilever beam. The direction of rotation is shown in Figure 6 As shown in (b), the floating plate 33 is aligned with the sand shooting port and struck. Figure 6 As shown in (c);

[0083] Step 5: The slapping part 3 is controlled to rotate repeatedly by the rotary driving member 12 so that the floating plate 33 repeatedly strikes the sand shooting port, causing the remaining uncured coated sand in the semi-enclosed cavity 61 to fall off and flow out of the sand shooting port.

[0084] The working principle of this embodiment is as follows:

[0085] The core-making mold is flipped so that the sand-shooting port faces downward. The sand-shooting equipment vibrates, forcing the uncured coated sand in the sand core to flow out of the port. This creates a semi-enclosed cavity within the initially emptied sand core. As the flapping unit strikes, a large amount of air enters the narrow semi-enclosed cavity. This air impact, through the cavity effect, loosens the uncured coated sand within. As the flapping unit leaves, the rapid withdrawal of the floating plate creates a lower pressure area at the sand-shooting port, creating a pressure differential with the semi-enclosed cavity. This allows the loosened coated sand within the semi-enclosed cavity to escape quickly. Repeated reciprocating strokes complete the sand core cleaning process.

[0086] As a preferred embodiment, the angle through which the beating part rotates from the initial position to the striking position is greater than 90°, preferably 90° to 93°, thereby ensuring to the greatest extent that the floating plate is in close contact with the sand-shooting port during beating, squeezing as much air as possible into the semi-enclosed cavity.

[0087] Specifically, the flapping frequency and speed of the flapping part can be adjusted according to actual needs.

[0088] Those skilled in the art will understand that the foregoing descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will be able to modify the technical solutions described in the foregoing embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An auxiliary sand cleaning device for sand core molding, characterized in that: It comprises a fixing part (1), a rotating part (2) and a flapping part (3); The fixing portion (1) comprises a connecting frame (11) on which a rotating driving member (12) is provided; The rotating part (2) comprises a cantilever beam, one end of the cantilever beam is connected to the output end of the rotating drive member (12), and the other end is connected to the slapping part (3); The flapping portion (3) comprises a floating mechanism and a floating plate (33); the floating mechanism provides an elastic restoring force for the floating plate (33), so that the floating plate (33) can move relative to the cantilever beam after being subjected to an external force; The area of the floating plate (33) is larger than the sand shooting port area of the core making mold; During operation, the connecting frame (11) is used to connect to the sand-shooting equipment, the rotary drive member (12) is used to provide a rotary torque, and the cantilever beam is used to convert the rotary torque into a striking motion of the striking portion (3), so that the floating plate (33) can be aligned with the sand-shooting port for repeated striking.

2. The auxiliary sand cleaning device for sand core molding according to claim 1, characterized in that: The structure of the floating mechanism includes an upper fixed plate (31), a lower fixed plate (32) and a sliding shaft assembly; The upper fixed plate (31) and the floating plate (33) are arranged in parallel and spaced apart, with at least two sliding shaft assemblies provided between them. The structure of the sliding shaft assembly includes a sliding shaft (36) and a wire spring (34); The first end of the sliding shaft (36) is passed through the upper fixed plate (31), and a limiting member (35) for axial limiting is provided at the portion extending out of the upper fixed plate (31), and a boss (361) is provided at the second end of the sliding shaft (36); A first step hole is provided in the lower fixed plate (32), which cooperates with the first step surface (3611) of the boss (361) to axially position the sliding shaft (36); a second step hole is provided in the floating plate (33), which cooperates with the second step surface (3612) of the boss (361) to axially position the sliding shaft (36); The first step surface (3611) is close to the first end of the sliding shaft (36), and the second step surface (3612) is close to the second end of the sliding shaft (36); The boss (361) is tightly fitted and securely connected to the floating plate (33); The wire spring (34) is sleeved on the sliding shaft (36), and both ends of the wire spring (34) are respectively in contact with the upper fixed plate (31) and the lower fixed plate (32) to be pre-tightened.

3. The auxiliary sand cleaning device for sand core molding according to claim 2, characterized in that: The outer ring of the through hole of the upper fixed plate (31) for passing the sliding shaft (36) is provided with a protective sleeve (37). The protective sleeve (37) is coaxially arranged outside the sliding shaft (36). The protective sleeve (37) extends in the axial direction and is used to limit the compression stroke of the wire spring (34).

4. The auxiliary sand cleaning device for sand core molding according to claim 2, characterized in that: The portion of the sliding shaft (36) extending from the upper fixed plate (31) is provided with an external thread, and the limiting member (35) is a nut that cooperates with the external thread.

5. The auxiliary sand cleaning device for sand core molding according to claim 2, characterized in that: The cantilever beam comprises a transverse plate (21) and a longitudinal plate (22), wherein the transverse plate (21) and the longitudinal plate (22) are vertically connected to form an L-shape; The transverse plate (21) is used to be connected to the output end of the rotary drive member (12); The longitudinal plate (22) is used to be connected to the upper fixed plate (31), and the upper fixed plate (31) is arranged parallel to the transverse plate (21).

6. The auxiliary sand cleaning device for sand core molding according to claim 2, characterized in that: The sliding shaft assemblies are provided with four and are distributed at the four corners of the beating portion (3).

7. The auxiliary sand cleaning device for sand core molding according to claim 1, characterized in that: The floating plate (33) is a rubber plate.

8. The auxiliary sand cleaning device for sand core molding according to claim 1, characterized in that: The rotary drive member (12) is a rotary cylinder.

9. An auxiliary sand cleaning method for the auxiliary sand cleaning device for sand core molding according to any one of claims 1 to 8, characterized in that: The following steps are involved: The sand cleaning device is connected to the sand shooting equipment via the connecting frame (11), so that the floating plate (33) is perpendicular to the plane where the sand shooting port of the core making mold on the sand shooting equipment is located; The sand shooting device adjusts the position of the core making mold so that the sand shooting port faces upward and starts core making. After the core making is completed, the sand shooting device drives the sand cleaning device and the core making mold to synchronously flip so that the sand shooting port faces downward. The sand shooting device vibrates to make the uncured coated sand in the sand core flow out from the sand shooting port, thereby forming a semi-closed cavity in the sand core. The rotating driving member (12) is started, which drives the beating portion (3) to rotate from the initial position to the striking position via the cantilever beam, so that the floating plate (33) is aligned with the sand shooting port for striking; The slapping part (3) is controlled to rotate repeatedly by the rotary driving member (12), so that the floating plate (33) repeatedly strikes the sand shooting port, causing the remaining uncured coated sand in the semi-enclosed cavity to fall off and flow out of the sand shooting port.

10. The auxiliary sand cleaning method according to claim 9, characterized in that: The angle through which the slapping portion (3) rotates from the initial position to the striking position is greater than 90°.

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