A sand core compacting device

Abstract

The utility model discloses a kind of sand core compactors, for the compacting of sand core in mould, compacting device includes mould cavity, the mould cavity bottom is set to mould block assembly and is set to the lower pressing cover plate assembly above mould block assembly, the lower pressing cover plate assembly is filled with core sand between mould block assembly, further include: split airbag assembly, it is arranged between the core sand upper end and the lower pressing cover plate assembly, including several airbags separately arranged, the airbag between adjacent each other is interconnected;Air source, for the split airbag assembly is inflated;Inflation connector, it is set on the lateral wall of the mould cavity, the inflation connector one end is communicated to the air source and another end is communicated to one of the airbag.The sand core compactor provided by the utility model can improve the uniformity of sand core compacting and improve the quality of sand core.

Description

Technical Field

[0001] This utility model belongs to the field of casting technology, and specifically relates to a sand core compaction device. Background Technology

[0002] Currently, the market typically uses 3D printing, manual core making, or subtractive processing to develop sample cores. The manual core making process is as follows: first, materials are prepared, then the mixed core sand is manually filled into the mold, then the pressure plate is pressed into the mold by equipment (or manually) to compact the core sand, then it is cured, and finally the sand core is removed from the mold after curing.

[0003] like Figure 1 As shown, there are often blocks 200 at the bottom of the mold 100. Depending on the shape of the required sand core, there is a certain height difference between the blocks 200 and the blocks 200. Existing manual core making usually uses manual or equipment to compact the core. Manual compaction is costly in terms of manpower and time. Furthermore, the force applied during each compaction is uneven, resulting in inconsistent compaction of the entire sand core. Equipment compaction typically uses a single pressure plate 300. If there are blocks 200 with significant height differences below the pressure plate 300, the pressure plate 300 may stop pressing at the higher block 200. This can easily lead to a situation where the core sand 400 at the higher part of the block 200 is extremely compacted, while the core sand 400 at the lower part remains uncompacted, as shown in Figure 2. When using the pressure plate 300 for compaction, because the pressure plate 300 is rigid, its downward movement is hindered at the block 200 position, affecting the compaction process of the core sand 400 on the side of the block 200.

[0004] The effects of uneven compaction caused by the above methods:

[0005] (1) This leads to inconsistent sand core strength. The sand core strength in some areas is poor, which will directly affect the quality of the casting, causing structural damage, porosity, sand adhesion and other quality problems.

[0006] (2) Increased scrap rate leads to waste of materials and energy;

[0007] (3) Low-strength sand cores will directly affect the collapsibility of the sand cores, increase the difficulty of subsequent sand cleaning processes of castings, extend the production cycle and increase labor costs. Utility Model Content

[0008] Based on the above problems, the purpose of this utility model is to provide a sand core compaction device that can improve the uniformity of sand core compaction.

[0009] To overcome the shortcomings of the existing technology, the technical solution provided by this utility model is as follows:

[0010] A sand core compaction device for compacting sand cores within a mold includes a mold cavity, a block assembly disposed at the bottom of the mold cavity, and a lower pressure cover plate assembly disposed above the block assembly. The space between the lower pressure cover plate assembly and the block assembly is filled with core sand. The device further includes:

[0011] The split-type airbag assembly is arranged between the upper end of the core sand and the lower pressure cover plate assembly, and includes several separately arranged airbags, with adjacent airbags interconnected.

[0012] An air source is used to inflate the split-type airbag assembly;

[0013] An inflation connector is provided on the side wall of the mold cavity, with one end connected to the air source and the other end connected to one of the air bags.

[0014] In one embodiment, the airbag includes an airbag body, two first interfaces disposed at both ends of the airbag body in a first direction, and two second interfaces disposed at both ends of the airbag body in a second direction, wherein the first direction and the second direction are perpendicular to each other.

[0015] In one embodiment, adjacent airbags are interconnected via a connector, which includes a body and two connecting parts disposed at both ends of the body. The two connecting parts and the body are sequentially connected to form an airflow channel, and the connecting parts are adapted to and connected to the first interface / second interface.

[0016] In one embodiment, when a riser clearance position is provided between two adjacent airbags, the adjacent airbags are connected by a connecting pipe.

[0017] In one embodiment, the inflation connector includes a fixing part fixed to the side wall of the mold cavity, a first connector part disposed at one end of the fixing part, and a second connector part disposed at the other end of the fixing part. The first connector part, the fixing part, and the second connector part are sequentially connected to form an airflow channel. The second connector part is adapted to be connected to the first interface / second interface. The outer diameter of the first connector part is larger than that of the second connector part.

[0018] In one embodiment, the first connector is connected to the gas source via a connecting pipe, and the connecting pipe is equipped with an inflation valve.

[0019] In one embodiment, the pressure cover assembly includes a cover and a drive component for moving the cover up and down.

[0020] In one embodiment, a sealing ring is provided between the cover plate and the upper end of the mold cavity.

[0021] Compared with the prior art, the advantages of this utility model are:

[0022] 1. Multiple airbags are used for compaction. The multiple airbags are flexible. After the airbags on the top of the mold block compact the core sand, the airbags on the side of the mold block will not stop because the airbags on the top of the mold block stop. They can continue to compact the core sand, thereby ensuring the uniformity of compaction.

[0023] 2. Multiple airbags are laid separately on top of the core sand. The core sand is compacted by inflating the airbags. The expansion and contraction of the airbags corresponding to the taller blocks can be reduced, while the expansion and contraction of the airbags corresponding to the shorter blocks can be increased. This allows for uniform compaction of the core sand, thereby improving the quality of the sand core.

[0024] 3. The structure of the airbag facilitates its connection with adjacent airbags in the first and second directions. The airbags are connected by connectors, which can ensure the tightness of the multiple airbags and improve the uniformity of compaction.

[0025] 4. When risers are provided between airbags to avoid them, the airbags are connected by a connecting pipe, which can improve the airflow speed and improve the compaction efficiency. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the following description of the embodiments will be briefly introduced. The drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of a pressure plate compacting core sand in the prior art;

[0028] Figure 2 This is a schematic diagram of a local state of core sand compaction by a pressure plate in the prior art;

[0029] Figure 3 This is a schematic diagram of the structure of a sand core compaction device according to an embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of the cooperation structure between the separate airbag assembly and the lower pressure cover plate assembly in an embodiment of this utility model;

[0031] Figure 5 This is a schematic diagram of the airbag structure in an embodiment of the present invention;

[0032] Figure 6 This is a schematic cross-sectional view of the airbag in an embodiment of the present invention;

[0033] Figure 7This is a schematic diagram of the connector structure in an embodiment of this utility model;

[0034] Figure 8 This is a cross-sectional structural diagram of the connector in an embodiment of the present invention;

[0035] Figure 9 This is a schematic diagram of the interconnection between airbags in an embodiment of the present invention;

[0036] Figure 10 This is a schematic diagram of the laying structure of the split airbag assembly in an embodiment of the present utility model;

[0037] Figure 11 This is a schematic diagram showing the state of the compacted sand core of the split airbag assembly in an embodiment of this utility model;

[0038] Figure 12 This is a schematic diagram of the compacted state in one embodiment of the present invention;

[0039] Figure 13 This is a schematic diagram of the secondary compaction state in an embodiment of this utility model;

[0040] in:

[0041] 100. Mold; 200. Molding block; 300. Pressure plate; 400. Core sand;

[0042] 1. Mold cavity;

[0043] 2. Molding blocks;

[0044] 3. Cover plate;

[0045] 4. Drive components;

[0046] 5. Sealing ring;

[0047] 6. Core sand;

[0048] 7. Split-type airbag assembly; 7-1. Airbag; 7-1a. Airbag body; 7-1b. First interface; 7-1c. Second interface; 7-2. Connector; 7-2a. Body part; 7-2b. Connecting part; 7-3. Connecting tube;

[0049] 8. Inflation connector;

[0050] 9. Gas source;

[0051] 10. Connecting pipe;

[0052] 11. Inflation valve. Detailed Implementation

[0053] The above solution will be further described below with reference to specific embodiments. It should be understood that these embodiments are for illustrating the present invention and are not intended to limit the scope of the present invention. The implementation conditions used in the embodiments can be further adjusted according to the conditions of specific manufacturers, and the implementation conditions not specified are usually the conditions in conventional experiments.

[0054] See Figure 3 and Figure 4 The diagram below shows a structural schematic of an embodiment of the present invention. A sand core compaction device is provided for compacting the sand core inside a mold. The device includes a mold cavity 1, a block assembly disposed at the bottom of the mold cavity 1, a lower pressure cover plate assembly disposed above the block assembly, a separate airbag assembly 7, an air source 9, and an inflation connector 8. Core sand 6 is filled between the lower pressure cover plate assembly and the block assembly.

[0055] The split-type airbag assembly 7 is laid on top of the core sand 6 and located below the lower pressure cover assembly, and includes several airbags 7-1 that are separated and connected to each other.

[0056] like Figure 5 and Figure 6 As shown, the airbag 7-1 includes an airbag body 7-1a, two first interfaces 7-1b located at both ends of the airbag body 7-1a in a first direction, and two second interfaces 7-1c located at both ends of the airbag body 7-1a in a second direction. The first and second directions are perpendicular to each other. The airbag 7-1 is capsule-shaped. The two first interfaces 7-1b are arranged at both ends of the airbag body 7-1a in the axial direction, and the two second interfaces 7-1c are arranged on both sides of the airbag 7-1a in the radial direction. It should be understood that other shapes of airbags, such as cubic shapes, can also be used, and this invention does not impose any limitations. For ordinary subtractive core fabrication, multiple airbags 7-1 laid on top of the core sand 6 are arranged in a rectangular array and cover the upper surface of the core sand 6 to ensure the compaction of the core sand 6. For sand cores 6 requiring riser casting, a riser avoidance position can be reserved between two airbags 7-1 at corresponding positions.

[0057] To ensure the airbag 7-1 is tightly compressed, such as Figure 9 As shown, adjacent airbags 7-1 are interconnected via connector 7-2, as... Figure 7 and Figure 8 As shown, the connector 7-2 includes a body portion 7-2a and two connecting portions 7-2b disposed at both ends of the body portion 7-2a. The two connecting portions 7-2b and the body portion 7-2a are connected in sequence to form an airflow channel. The connecting portions 7-2b are adapted to connect with the first interface 7-1b / second interface 7-1c. The connecting portions 7-2b gradually taper outward from the body portion 7-2a and form multiple truncated cones arranged at intervals along the axial direction to improve the stability of the connection with the first interface 7-1b / second interface 7-1c.

[0058] like Figure 10 As shown, when riser clearance positions are set between airbags 7-1, in order to improve inflation efficiency, the two airbags 7-1 with riser clearance positions are connected by a connecting pipe 7-3. The connecting pipe 7-3 can be a flexible tube such as a silicone tube.

[0059] Air source 9 is used to inflate the split airbag assembly 7, and generally uses compressed air source, such as an air compressor.

[0060] An inflation connector 8 is disposed on the side wall of the mold cavity 1. One end of the inflation connector 8 is connected to the air source 9 and the other end is connected to one of the air bags 7-1. Specifically, the inflation connector 8 includes a fixing part fixed to the side wall of the mold cavity 1, a first connector part disposed at one end of the fixing part, and a second connector part disposed at the other end of the fixing part. The first connector part, the fixing part, and the second connector part are connected in sequence to form an airflow channel. The second connector part extends to the inner wall of the mold cavity 1 and is adapted to connect to the first interface 7-1b / second interface 7-1c. The outer diameter of the first connector part is larger than that of the second connector part and extends to the outside of the mold cavity 1 to facilitate connection with the air source 9.

[0061] In this example, the first connector is connected to the air source 9 via a connecting pipe 10, and an inflation valve 11 is installed on the connecting pipe 10 to control the on / off state of the air source 9.

[0062] The pressing cover assembly includes a cover plate 3 and a driving component 4 for moving the cover plate 3 up and down. The driving component 4 can be a cylinder. The cylinder drives the cover plate 3 to move closer to or away from the top of the split airbag assembly 7. In this example, after the pressing cover assembly moves down, it abuts against the upper end of the mold cavity 1. This makes it easier to control the distance the cover plate 3 moves, so as to control the inflation degree of the airbag 7-1. It should be understood that in other embodiments, the cover plate 3 can also extend into the mold cavity 1.

[0063] To improve sealing and prevent the core sand 6 from being ejected from the mold cavity 1 due to damage to the airbag 7-1, a sealing ring 5 is provided at the upper end of the cover plate 3 and the mold cavity 1. Specifically, a limiting groove is provided at the lower end of the cover plate 3, and the sealing ring 5 is arranged in the limiting groove.

[0064] The working principle of this utility model is as follows:

[0065] After artificial sand mixing, the core sand 6 is filled into the mold cavity 1. Multiple airbags 7-1 are placed on top of the core sand 6 and interconnected. Then, one airbag 7-1 near the inflation connector 8 is connected to the inflation connector 8. The cover plate 3 is moved down to the upper end of the mold cavity 1 by the driving component 4, and air is inflated into the multiple airbags 7-1 to compact the core sand 6. Multiple airbags 7-1 are used for compaction. The multiple airbags 7-1 are flexible. Figure 11As shown, after the airbag 7-1 above the mold block 2 compacts the core sand 6, the airbag 7-1 on the left side of the mold block 2 will not stop because the airbag 7-1 above the mold block 2 stops, and can continue to compact the core sand 6, thus ensuring uniform compaction. After compaction is completed, the cover plate 3 is moved up and multiple airbags 7-1 are removed. For thicker sand cores, one compaction is completed (e.g., Figure 12 (As shown) Then, stack multiple mold cavities 1 one on top of the other, fill the mold cavity 1 with core sand 6 multiple times, and place multiple airbags 7-1 on top of the core sand 6 multiple times to compact the core sand 6 (as shown). Figure 13 The diagram shown illustrates the state of secondary compaction.

[0066] In summary, this compaction device and method can compact the core sand to different degrees at different locations according to the arrangement of the blocks, thereby ensuring the uniformity of the core sand compaction.

[0067] The above examples are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be used to limit the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A sand core compaction device for compacting sand cores within a mold, comprising a mold cavity, a block assembly disposed at the bottom of the mold cavity, and a lower pressure cover plate assembly disposed above the block assembly, wherein core sand is filled between the lower pressure cover plate assembly and the block assembly, characterized in that, Also includes: The split-type airbag assembly is arranged between the upper end of the core sand and the lower pressure cover plate assembly, and includes several separately arranged airbags, with adjacent airbags interconnected. An air source is used to inflate the split-type airbag assembly; An inflation connector is provided on the side wall of the mold cavity, with one end connected to the air source and the other end connected to one of the air bags.

2. The sand core compaction device according to claim 1, characterized in that: The airbag includes an airbag body, two first interfaces disposed at both ends of the airbag body in a first direction, and two second interfaces disposed at both ends of the airbag body in a second direction, wherein the first direction and the second direction are perpendicular to each other.

3. The sand core compaction device according to claim 2, characterized in that: Adjacent airbags are interconnected via a connector, which includes a main body and two connecting parts disposed at both ends of the main body. The two connecting parts and the main body are sequentially connected to form an airflow channel, and the connecting parts are adapted to and connected to the first interface / second interface.

4. The sand core compaction device according to claim 2, characterized in that: When a riser is provided between two adjacent airbags to avoid them, the adjacent airbags are connected by a connecting pipe.

5. The sand core compaction device according to claim 4, characterized in that: The inflation connector includes a fixing part fixed to the side wall of the mold cavity, a first connector part disposed at one end of the fixing part, and a second connector part disposed at the other end of the fixing part. The first connector part, the fixing part, and the second connector part are connected in sequence to form an airflow channel. The second connector part is adapted to be connected to the first interface / second interface. The outer diameter of the first connector part is larger than that of the second connector part.

6. The sand core compaction device according to claim 5, characterized in that: The first connector is connected to the air source via a connecting pipe, and the connecting pipe is equipped with an inflation valve.

7. The sand core compaction device according to claim 1, characterized in that: The pressing cover plate assembly includes a cover plate and a driving component for moving the cover plate up and down.

8. The sand core compaction device according to claim 7, characterized in that: A sealing ring is provided between the cover plate and the upper end of the mold cavity.

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