Auxiliary sand cleaning device and method for sand core forming

Abstract

The invention relates to an auxiliary sand cleaning device and method for sand core forming. The device comprises a fixed part, a rotating part and a flapping part. The fixing part comprises a connecting frame, and a rotary driving piece is arranged on the connecting frame; the rotating part comprises a cantilever beam, one end of the cantilever beam is connected with the output end of the rotating driving piece, and the other end is connected with the flapping part; the flapping part comprises a floating mechanism and a floating plate; the floating mechanism provides elastic restoring force for the floating plate, so that the floating plate can float relative to the cantilever beam after being subjected to external force; the area of the floating plate is larger than that of a sand shooting opening of the core making mold; in the working process, the connecting frame is used for being connected with sand shooting equipment, the rotating driving piece is used for providing rotating torque, the cantilever beam is used for converting the rotating torque into beating motion of the beating part, and therefore the floating plate can be aligned with a sand shooting opening for repeated beating. Uncured precoated sand in the sand core can be removed to the maximum extent, and the sand discharging effect is improved.

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 products made by curing coated sand at high temperature in a sand core mold, and are used to assist in molding during casting. When the sand core is formed, heat is transferred from the outer wall of the high-temperature core-making mold to the internal cavity. After the outer layer of the sand core solidifies into a hard shell, there is still a large amount of uncured coated sand inside (especially near the sand shooting port of the core-making mold). Coated sand is composed of quartz sand, resin, curing agent and other components. Chemical products such as resin will form a large amount of gas after heating. During the casting process, the more coated sand remains in the sand core, the more gas will be formed by heat. The escape of gas will affect the filling of the alloy liquid and thus seriously affect the quality of the casting product, and cause pollution and harm. Therefore, when making sand cores, it is necessary to remove as much uncured coated sand as possible from the sand core.

[0003] The current method of removing coated sand is to flip the sand shooting port of the core making mold to face downward and vibrate the core making mold so that the uncured coated sand in the sand core flows out from the sand shooting port under the action of gravity and vibration. However, the resin in the coated sand melts due to heat, causing the sand particles to stick to each other, resulting in poor sand cleaning effect and a large amount of sand remaining in the sand core. Summary of the invention

[0004] In view of the deficiencies in the prior art, 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 by 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 part comprises a connecting frame on which a rotating driving member is provided;

[0008] The rotating part comprises a cantilever beam, one end of the cantilever beam is connected to the output end of the rotating driving member, and the other end of the cantilever beam 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] When working, the connecting frame is used to connect with the sand shooting equipment, the rotating driving member is used to provide the rotating torque, and the cantilever beam is used to convert the rotating torque into the striking motion of the flapping part, so that the floating plate can align 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, and at least two sliding shaft assemblies are arranged between the two. 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 fixing plate, and a limiting member for axial limiting is provided at the portion extending out of the upper fixing plate, and a boss is provided at the second end of the sliding shaft;

[0016] The lower fixed plate is provided with a first step hole, which cooperates with the first step surface of the boss to axially position the sliding shaft; the floating plate is provided with a second step hole, which cooperates with the second step 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 attached to and firmly connected with the floating plate;

[0019] The wire spring is sleeved on the sliding shaft, and two ends of the wire spring are respectively abutted against the lower 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, and the protective sleeve is coaxially arranged outside the sliding shaft. The protective sleeve extends axially and is used 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 comprises a transverse plate and a longitudinal plate, wherein the transverse plate and the longitudinal plate are vertically connected to form an L shape;

[0023] The transverse plate is used to be connected to the output end of the rotary drive member;

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

[0025] The sliding shaft components are provided with four and are 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 device 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 device is located;

[0030] The sand shooting device adjusts the position of the core making mold so that the sand shooting port faces upwards, 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 downwards. The sand shooting device vibrates so that the uncured coated sand in the sand core flows out from the sand shooting port, thereby forming a semi-closed cavity in the sand core.

[0031] The rotating driving member is started, and it drives the beating part to rotate from the initial position to the striking position through the cantilever beam, so that the floating plate is aligned with the sand shooting port for striking;

[0032] The beating 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] The present invention uses the clapping action to squeeze air into the semi-enclosed cavity in the sand core to produce a cavity effect, thereby destroying the structure of the uncured but heat-adhered coated sand, causing it to loosen and peel off, thereby achieving auxiliary sand cleaning. On the basis of vibration sand cleaning, the residual coated sand in the sand core can be further removed to minimize the residual coated sand, thereby 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 stressed, so that the floating plate is attached to the sand shooting port to avoid being bounced off and causing ineffective striking.

[0038] The wire spring of the floating mechanism of the present invention reduces the recoil force received by the beating part when it hits the mold, and effectively protects the stability of the sand cleaning device structure.

[0039] The floating plate of the present invention can use a soft rubber plate, and utilize the toughness of the rubber plate 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, so that a pressure difference is formed between it and the semi-enclosed cavity in the sand core, thereby improving the sand discharge effect.

[0040] The invention has reasonable structural design, low production cost, high 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 member, and when corresponding to different molds, it can ensure that the sand shooting port of the mold is completely hit, and the versatility is strong.

[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 It is a 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 It is a top view of an embodiment of the present invention.

[0046] Figure 4 for Figure 3 Sectional view of section AA.

[0047] Figure 5 It is a schematic diagram of the installation structure when the embodiment of the present invention is used.

[0048] Figure 6 It is a schematic diagram of the state of the sand cleaning process in an embodiment of the present invention.

[0049] Figure 7 It is a schematic structural diagram 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. longitudinal plate; 31. upper fixed plate; 32. lower fixed plate; 33. floating plate; 34. wire spring; 35. limit 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 implementation of the present invention is described below with reference to the accompanying drawings.

[0052] Example 1

[0053] 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;

[0054] The fixing part 1 comprises a connecting frame 11 on which a rotating driving member 12 is provided;

[0055] 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 beating part 3;

[0056] 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 receiving an external force;

[0057] The area of ​​the floating plate 33 is larger than the sand shooting port area of ​​the core making mold;

[0058] When working, the connecting frame 11 is used to connect with the sand shooting equipment, and the rotating driving member 12 is used to provide a rotating torque, and its direction is shown in FIG. Figure 1 As shown by the middle arrow, the cantilever beam is used to convert the rotation torque into the striking motion of the striking part 3, so that the floating plate 33 can be aligned with the sand shooting port for repeated striking.

[0059] As a specific implementation, the structure of the floating mechanism includes an upper fixed plate 31, a lower fixed plate 32 and a sliding shaft assembly;

[0060] 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;

[0061] The first end of the sliding shaft 36 is passed through the upper fixing plate 31, and a stopper 35 for axial limiting is provided at the portion extending out of the upper fixing plate 31, and a boss 361 is provided at the second end of the sliding shaft 36;

[0062] 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;

[0063] 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 ;

[0064] The boss 361 is tightly attached to and firmly connected with the floating plate 33;

[0065] The wire spring 34 is sleeved on the sliding shaft 36 , and two ends of the wire spring 34 are respectively in contact with the lower fixing plate 32 and the lower fixing plate 32 to be pre-tightened.

[0066] 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 matched with the external thread. By adjusting the locking position of the nut, the preload force of the wire spring 34 can be adjusted.

[0067] In this embodiment, the beating part 3 beats the sand injection port, and the floating plate 33 is subjected to external force, and moves along the axial direction together with the lower fixed plate 32 and the sliding shaft 36. 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.

[0068] The first end of the sliding shaft 36 is limited in axial position by the stopper 35 to prevent it from slipping out of 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.

[0069] As a preferred embodiment, in order to protect the wire spring 34, a protective sleeve 37 is provided on the outer ring of the through hole of the upper fixed plate 31 for passing the sliding shaft 36. The protective sleeve 37 is coaxially arranged outside the sliding shaft 36. The protective sleeve 37 extends in the axial direction and can limit the compression stroke of the wire spring 34. When the bottom end of the protective sleeve 37 contacts the lower fixed plate 32, it is the shortest distance for the wire spring 34 to be compressed, thereby preventing the wire spring 34 from being over-compressed.

[0070] 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 strikes, the floating plate 33 can be completely fitted with the sand shooting port.

[0071] 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;

[0072] The horizontal plate 21 is used to connect with the output end of the rotary drive member 12;

[0073] The longitudinal plate 22 is used to be connected to the upper fixing plate 31 , and the upper fixing plate 31 is arranged parallel to the transverse plate 21 .

[0074] The rotary driving member 12 is a rotary cylinder.

[0075] 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 on the rotating surface of the rotating drive member 12, and the two rectangular sheet metals are installed on the outside of the long side.

[0076] As a preferred embodiment, four sliding shaft assemblies are provided, which are distributed at the four corners of the flapping part 3 to ensure that the upper and lower fixing plates are parallel to the greatest extent.

[0077] The connecting frame 11 is a T-shaped sheet metal part, the rotating driving 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.

[0078] Example 2

[0079] This embodiment provides an auxiliary sand cleaning method of the auxiliary sand cleaning device for sand core molding of embodiment 1, comprising the following steps:

[0080] 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;

[0081] Step 2: The sand shooting device 5 adjusts the position of the core making mold 4 so that the sand shooting port faces upward. Figure 6 As shown in (a), core making begins;

[0082] Step 3: After the core making is completed, 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;

[0083] Step 4: Start the rotating drive member 12, which drives the beating part 3 to rotate from the initial position to the striking position through the cantilever beam. The rotation direction is shown in Figure 6 As shown in (b), the floating plate 33 is aimed at the sand shooting port for striking. Figure 6 As shown in (c);

[0084] Step 5: The beating part 3 is controlled to rotate repeatedly by the rotating driving member 12, so that the floating plate 33 repeatedly strikes the sand shooting port, so that the remaining uncured coated sand in the semi-enclosed cavity 61 falls off and flows out from the sand shooting port.

[0085] The working principle of this embodiment is as follows:

[0086] The core-making mold is flipped so that the sand-shooting port faces downward, and the sand-shooting equipment vibrates, causing the uncured coated sand in the sand core to flow out from the sand-shooting port. A semi-enclosed cavity is formed in the sand core that is initially emptied in the mold. When the slapping part slaps, a large amount of air enters the narrow semi-enclosed cavity. Using the cavity effect, the uncured coated sand inside is loosened by the impact of the air. When the slapping part leaves, a lower pressure area is formed at the sand-shooting port due to the rapid withdrawal of the floating plate, forming a pressure difference with the semi-enclosed cavity, so that the coated sand in the semi-enclosed cavity that is loosened by the impact of the air can be quickly detached. After several reciprocating slaps, the sand core can be cleaned.

[0087] As a preferred embodiment, the angle through which the flapping 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 flapping, squeezing as much air as possible into the semi-enclosed cavity.

[0088] Specifically, the beating frequency and speed of the beating part can be adjusted according to actual needs.

[0089] Those skilled in the art can understand that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope 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 beating part (3); The fixing part (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 driving member (12), and the other end of the cantilever beam is connected to the beating part (3); The flapping part (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 area of ​​the sand shooting port of the core making mold; When in operation, the connecting frame (11) is used to connect with the sand-shooting equipment, the rotating driving member (12) is used to provide a rotating torque, and the cantilever beam is used to convert the rotating 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 comprises an upper fixing plate (31), a lower fixing plate (32) and a sliding shaft assembly; 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); The first end of the sliding shaft (36) is inserted into the upper fixing plate (31), and a limiting member (35) for axial limiting is provided at the portion extending out of the upper fixing plate (31), and a boss (361) is provided at the second end of the sliding shaft (36); The lower fixed plate (32) is provided with a first step hole, which cooperates with the first step surface (3611) of the boss (361) to axially position the sliding shaft (36); the floating plate (33) is provided with a second step hole, 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 attached to and firmly connected with the floating plate (33); The wire spring (34) is sleeved on the sliding shaft (36), and two ends of the wire spring (34) are respectively in contact with the lower fixing plate (32) and the lower fixing 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 out of the upper fixing plate (31) is provided with an external thread, and the limiting member (35) is a nut matched 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 fixing plate (31), and the upper fixing 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 components are provided with four and are distributed at the four corners of the beating part (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 through 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 upwards, 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 downwards. The sand shooting device vibrates so that the uncured coated sand in the sand core flows out from the sand shooting port, thereby forming a semi-closed cavity in the sand core. The rotating driving member (12) is started, and it drives the beating part (3) to rotate from the initial position to the striking position through the cantilever beam, so that the floating plate (33) is aligned with the sand shooting port for striking; The beating part (3) is controlled to rotate repeatedly by the rotating driving member (12), so that the floating plate (33) repeatedly strikes the sand shooting port, so that the remaining uncured coated sand in the semi-enclosed cavity falls off and flows out from the sand shooting port.

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

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