Impeller sand core and mold thereof
The impeller sand core is formed by splicing and combining multiple active sand cores, which solves the problem of molded sand falling off during the removal of impeller sand cores in the prior art, and improves casting accuracy and molding efficiency.
Patent Information
- Application Number
- CN202420673222.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-02
- Publication Date
- 2025-03-14
- Estimated Expiration
- 2034-04-02
AI Technical Summary
During the removal process, existing impeller sand core molds are prone to cause mold sand to fall off, causing mold damage, and thus affecting the accuracy and shape of impeller casting.
Multiple movable sand core pieces are spliced and combined to form an impeller sand core. The impeller sand core includes a molding part and a positioning part, and the impeller cavity is formed by splicing the locking blocks, and the entire structure is fixed through the fixing part and the fixing groove.
The casting accuracy of the impeller sand core is improved, errors with the original design size and shape are reduced, defects such as shrinkage, sparse and air pores are avoided, and molding efficiency is increased.
Smart Images
Figure CN222607935U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of casting equipment, and particularly relates to an impeller sand core and a mold thereof. Background Art
[0002] As the core component of the pump, the impeller plays a vital role in the comprehensive performance of the entire equipment. The impeller is generally composed of a front cover plate, a hub and blades. The cover plate is a rotating body, and the blades are usually complex spatial distorted bodies. The closed impeller is composed of a front cover plate, a rear cover plate, a hub and blades. Sand casting is a common method for manufacturing impellers. The overmolding sand core used in the existing casting mold for forming pump impellers is an integrated structure. The processed impeller blade mold must be placed in the mold first. Due to the narrow, long and twisted shape of the impeller blade mold, the integrated overmolding sand core needs to be shaken left and right to remove the impeller blade mold when it is demolded. When the impeller blade mold is shaken, part of the molding sand will fall off, resulting in part of the molding sand being taken out when the overmolding sand core is taken out, which will cause the mold cavity of the blade on the overmolding sand core to be damaged, resulting in a large error between the actual size and shape of the pump impeller blade cast and the original design size and shape. Utility Model Content
[0003] The utility model aims to solve the above problems in the prior art and proposes an impeller sand core which can improve the precision of casting products.
[0004] The purpose of the utility model can be achieved through the following technical solutions: an impeller sand core, comprising a plurality of movably arranged sand core blocks, each of the sand core blocks comprising an integrally arranged forming part and a positioning part, in the horizontal direction, positioning blocks and positioning grooves are respectively arranged at both ends of the positioning part, a plurality of the positioning parts are sequentially spliced end to end to form a positioning ring, and the positioning blocks on the positioning parts are plugged and fixed with the positioning grooves on adjacent positioning parts, the forming part is arranged on the inner side of the positioning part, and the forming part comprises a locking block which extends toward one end of the positioning part and symmetrically extends toward both sides of the positioning part, and at least one blade cavity is arranged on the locking block, when the positioning parts are spliced to form a positioning ring, a plurality of the locking blocks are spliced and combined with each other, and an impeller cavity is formed inside the combined plurality of locking blocks.
[0005] In the above-mentioned impeller sand core, when the locking blocks are spliced, the blade cavity is also formed between the extended surfaces of two adjacent locking blocks.
[0006] In the above-mentioned impeller sand core, the end of the locking block is provided with a splicing surface, and when the locking blocks are spliced and combined with each other, a closed area is formed between the splicing surfaces.
[0007] In the above-mentioned impeller sand core, it also includes a fixed sealing block, a fixing groove is opened on the end face of the fixed sealing block, and a fixing part is integrally provided at the lower end of the locking block. When the locking blocks are spliced and combined, multiple pieces of the fixing parts are spliced to form a fixed block, and the fixed block is plugged and fixed in the fixing groove.
[0008] In the above-mentioned impeller sand core, a fastening groove is arranged at the outer end surface of the positioning ring, and a fastening steel bar is arranged in the fastening groove.
[0009] A mould comprises the impeller sand core mentioned above.
[0010] In the above-mentioned mold, it also includes a sand box, which includes an upper sand box and a lower sand box, and the upper sand box and the lower sand box are both provided with an installation cavity. The upper sand box and the lower sand box can be combined to form a closed box body for accommodating the impeller sand core. When the impeller sand core is installed in the lower sand box, the outer wall of the positioning ring is abutted against the inner wall of the installation cavity in the lower sand box, and the upper end face of the positioning ring is flush with the upper end face of the installation cavity.
[0011] In the above-mentioned mold, a limiting block is arranged on the outer wall of the positioning ring, and a limiting cavity connected with the installation cavity is arranged in the lower sand box. When the impeller sand core is installed in the lower sand box, the positioning block is located in the limiting cavity.
[0012] In the above-mentioned mold, the upper flask and the lower flask are symmetrically provided with lifting parts.
[0013] In the above-mentioned mold, a step surface is provided at the peripheral edge of the lower sand box, and a limit ring is provided at the edge of the lower end surface of the upper sand box. When the upper sand box is combined with the lower sand box, the outer wall of the limit ring abuts against the step surface.
[0014] Compared with the prior art, the beneficial effects of the utility model are:
[0015] (1) Multiple movable sand core blocks are spliced together to form an impeller sand core. Compared with the integrally formed impeller sand core, the separate processing of multiple sand core blocks is easier to form, so that the casting accuracy of the multiple independently set sand core blocks is higher. Then, when the impeller sand core is spliced together to form the impeller sand core, the error between the impeller sand core and the original design size and shape is smaller, and it is not easy to produce casting defects such as shrinkage holes, sparse holes and air holes;
[0016] (2) When the sand core blocks are spliced, the locking blocks on the sand core blocks can bite each other, making it difficult for the spliced impeller sand core to fall apart, thereby increasing the molding efficiency.
[0017] (3) When multiple locking blocks are spliced together to form an impeller sand core, in order to prevent it from spreading, a fixing part is provided at the end of the impeller sand core. After the impeller sand core is spliced and formed, multiple fixing parts are also combined to form a fixing block. The fixing block is plugged and fixed into the fixing groove, which can fix and restrict the entire impeller sand core. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is one of the three-dimensional structural diagrams of the impeller sand core;
[0019] Figure 2 This is the second schematic diagram of the three-dimensional structure of the impeller sand core;
[0020] Figure 3 yes Figure 1 A schematic diagram of the cross-sectional structure of;
[0021] Figure 4 It is one of the three-dimensional structural diagrams of the sand core block;
[0022] Figure 5 This is the second schematic diagram of the three-dimensional structure of the sand core block;
[0023] Figure 6 It is an exploded schematic diagram of the impeller sand core and the fixed seal block;
[0024] Figure 7 It is a schematic diagram of the explosion structure of the sand box;
[0025] Figure 8 It is a schematic diagram of the assembly connection between the impeller sand core and the lower sand box;
[0026] Fig. 9 It is a three-dimensional structural diagram of the sand box.
[0027] In the figure, there are impeller sand core 100; sand core block 101; positioning portion 102; positioning block 103; positioning groove 104; impeller cavity 105; locking block 106; blade cavity 107; extension surface 108; joint surface 109; fixed sealing block 110; fixed groove 111; fixed portion 112; fastening groove 113; upper sand box 114; lower sand box 115; installation cavity 116; limit block 117; lifting portion 118; step surface 119. DETAILED DESCRIPTION
[0028] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.
[0029] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.
[0030] like Figure 1-Figure 6 As shown, an impeller sand core 100 includes a plurality of movably arranged sand core blocks 101, each of which includes an integrally arranged forming portion and a positioning portion 102. In the horizontal direction, positioning blocks 103 and positioning grooves 104 are respectively provided at both ends of the positioning portion 102. The plurality of positioning portions 102 are sequentially spliced end to end to form a positioning ring, and the positioning blocks 103 on the positioning portions 102 are plugged and fixed with the positioning grooves 104 on the adjacent positioning portions 102. The forming portion is arranged on the inner side of the positioning portion 102, and the forming portion includes a locking block 106 which extends toward one end of the positioning portion 102 and symmetrically extends toward both sides of the positioning portion 102, and the locking block 106 is provided with at least one blade cavity 107. When the positioning portions 102 are spliced to form a positioning ring, the plurality of locking blocks 106 are spliced and combined with each other, and an impeller cavity 105 is formed inside the combined plurality of locking blocks 106.
[0031] In the present embodiment, a plurality of movably arranged sand core blocks 101 are spliced and combined to form an impeller sand core 100. Compared with the integrally formed impeller sand core 100, the separate processing of the plurality of sand core blocks 101 makes it easier to form, so that the casting accuracy of the plurality of independently arranged sand core blocks 101 is higher. Then, after the impeller sand core 100 is formed by splicing and combining, the error between the impeller sand core 100 and the original design size and shape is smaller, and it is not easy to produce casting defects such as shrinkage holes, sparse holes and air holes. Moreover, when the sand core blocks 101 are spliced, the locking blocks 106 on the sand core blocks 101 can bite each other, so that the impeller sand core 100 after the splicing and combination is not easy to fall apart, thereby increasing the molding efficiency.
[0032] Specifically, the positioning block 103 and the positioning groove 104 are both conical in shape, so that the positioning block and the positioning groove can be plugged and matched.
[0033] Further preferably, when the locking blocks 106 are spliced, a blade cavity 107 is also formed between the extension surfaces 108 of two adjacent locking blocks 106 .
[0034] In this embodiment, it is difficult to directly form the blade cavity 107 on the sand core block 101, but if all the blade cavities 107 are spliced and combined through the extension surface 108 on the locking block 106, the number of sand core blocks 101 will increase, thereby increasing the difficulty of splicing the impeller sand core 100, resulting in a decrease in its molding efficiency. Therefore, as shown in the figure, in this application, the number of sand core blocks 101 is set to three, each sand core block 101 is provided with a blade cavity 107, and a blade cavity 107 can also be formed between the extension surfaces 108 of two adjacent sand core blocks 101.
[0035] Preferably, a joint surface 109 is provided at the end of the locking block 106 , and when the locking blocks 106 are joined together, a closed area is formed between the joint surfaces 109 .
[0036] In this embodiment, in order to improve the positioning accuracy between the sand core blocks 101, a splicing surface 109 is provided on each locking block 106. Along the extension direction of the positioning ring, the edges at both ends of the splicing surface 109 are arc-shaped edges. After two adjacent sand core blocks 101 are spliced and combined, the arc-shaped edges at one end of their splicing surfaces 109 can be spliced with each other. When all the locking blocks 106 are spliced, their splicing surfaces 109 form a closed area.
[0037] It is worth mentioning that, after all the joint surfaces 109 are assembled and spliced together, the upper end surfaces of all the joint surfaces 109 are located on the same horizontal plane.
[0038] Further preferably, it also includes a fixed sealing block 110, a fixing groove 111 is opened on the end face of the fixed sealing block 110, and a fixing part 112 is integrally provided at the lower end of the locking block 106. When the locking blocks 106 are spliced and combined, multiple fixing parts 112 are spliced to form a fixed block, and the fixed block is plugged and fixed in the fixing groove 111.
[0039] In this embodiment, when multiple locking blocks 106 are spliced and combined to form the impeller sand core 100, in order to prevent it from dispersing, a fixing portion 112 is provided at the end of the impeller sand core 100. After the impeller sand core 100 is spliced and formed, the multiple fixing portions 112 are also combined to form a fixing block, and the fixing block is plugged and fixed to the fixing groove 111, which can fix and restrict the entire impeller sand core 100.
[0040] It is worth mentioning that the edge shapes of the multiple fixing portions 112 are different, and when they are spliced together, a complete fixing block is formed.
[0041] Further preferably, a fastening groove 113 is provided at the outer end surface of the positioning ring, and a fastening steel bar is provided in the fastening groove 113 .
[0042] In this embodiment, in order to further enhance the stable connection between the combined impeller sand cores 100 , a circle of fastening steel bars is wound around the positioning ring of the combined impeller sand core 100 to fasten the impeller sand core 100 .
[0043] like Figure 7-Figure 9 As shown, a mold includes an impeller sand core 100 and a sand box, the sand box includes an upper sand box 114 and a lower sand box 115, and the upper sand box 114 and the lower sand box 115 are both provided with an installation cavity 116. The upper sand box 114 and the lower sand box 115 can be combined to form a closed box body for accommodating the impeller sand core 100. When the impeller sand core 100 is installed in the lower sand box 115, the outer wall of the positioning ring is abutted against the inner wall of the installation cavity 116 in the lower sand box 115, and the upper end surface of the positioning ring is flush with the upper end surface of the installation cavity 116.
[0044] In this embodiment, the cavity wall size of the installation cavity 116 in the lower sand box 115 is the same as the outer wall size of the impeller sand core 100, which can ensure that when the impeller sand core 100 is placed in the lower sand box 115, the impeller sand core 100 will not shake. At the same time, the lower sand box 115 can also tighten the impeller sand core 100 again, and the upper end surface of the positioning ring is flush with the upper end surface of the installation cavity 116, so the installation position between the impeller sand core 100 and the lower sand box 115 in the vertical direction can be positioned.
[0045] Further preferably, a limit block 117 is provided at the outer wall of the positioning ring, and a limit cavity connected with the installation cavity 116 is provided in the lower sand box 115. When the impeller sand core 100 is installed in the lower sand box 115, the positioning block 103 is located in the limit cavity. The cooperation between the limit block 117 and the limit cavity can position the relative angle between the impeller sand core 100 and the lower sand box 115, so as to facilitate the subsequent process.
[0046] Further preferably, the upper sand box 114 and the lower sand box 115 are symmetrically provided with lifting parts 118, and the lifting parts 118 include lifting blocks. When the lower sand box 115 and the upper sand box 114 need to be moved, they can be connected with the lifting blocks by a crane.
[0047] Further preferably, a step surface 119 is provided at the peripheral edge of the lower sand box 115 , and a limit ring 120 is provided at the lower end surface edge of the upper sand box 114 . When the upper sand box 114 and the lower sand box 115 are combined, the outer wall of the limit ring abuts against the step surface 119 .
[0048] In this embodiment, in order to ensure the assembly and splicing accuracy of the upper flask 114 and the lower flask 115, a limiting ring is additionally provided to abut and fix the step surface 119.
[0049] It is worth mentioning that a plurality of through holes are provided on the upper sand box 114 for accommodating risers and air outlets.
[0050] It should be noted that in the present utility model, descriptions such as "first", "second", "one", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. The terms "connected", "fixed", etc. should be understood in a broad sense. For example, "fixed" can be a fixed connection, a detachable connection, or an integral whole; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.
[0051] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.
[0052] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.
Claims
1. An impeller sand core, characterized in that: It comprises a plurality of movably arranged sand core blocks, each of which comprises an integrally arranged forming part and a positioning part. In the horizontal direction, positioning blocks and positioning grooves are respectively arranged at both ends of the positioning part. The plurality of positioning parts are sequentially spliced end to end to form a positioning ring, and the positioning blocks on the positioning parts are plugged and fixed with the positioning grooves on the adjacent positioning parts. The forming part is arranged on the inner side of the positioning part, and the forming part comprises a locking block which extends toward one end of the positioning part and symmetrically extends toward both sides of the positioning part, and at least one blade cavity is arranged on the locking block. When the positioning parts are spliced to form a positioning ring, the plurality of locking blocks are spliced and combined with each other, and an impeller cavity is formed inside the combined plurality of locking blocks.
2. The impeller sand core according to claim 1, characterized in that: When the locking blocks are spliced, the blade cavity is also formed between the extended surfaces of two adjacent locking blocks.
3. The impeller sand core according to claim 1, characterized in that: The ends of the locking blocks are provided with joint surfaces, and when the locking blocks are joined together, a closed area is formed between the joint surfaces.
4. The impeller sand core according to claim 1, characterized in that: It also includes a fixed sealing block, a fixing groove is opened on the end surface of the fixed sealing block, and a fixing part is integrally provided at the lower end of the locking block. When the locking blocks are spliced and combined, multiple pieces of the fixing parts are spliced to form a fixed block, and the fixed block is plugged and fixed in the fixing groove.
5. The impeller sand core according to claim 1, characterized in that: A fastening groove is arranged at the outer end surface of the positioning ring, and a fastening steel bar is arranged in the fastening groove.
6. A mold, characterized in that: It comprises the impeller sand core as described in any one of claims 1 to 5.
7. A mold according to claim 6, characterized in that: It also includes a sand box, which includes an upper sand box and a lower sand box, and both the upper sand box and the lower sand box are provided with installation cavities. The upper sand box and the lower sand box can be combined to form a closed box for accommodating an impeller sand core. When the impeller sand core is installed in the lower sand box, the outer wall of the positioning ring formed by the positioning portion abuts against the inner wall of the installation cavity in the lower sand box, and the upper end surface of the positioning ring is flush with the upper end surface of the installation cavity.
8. A mold according to claim 7, characterized in that: A limiting block is arranged on the outer wall of the positioning ring, and a limiting cavity communicating with the installation cavity is arranged in the lower sand box. When the impeller sand core is installed in the lower sand box, the positioning block is located in the limiting cavity.
9. A mold according to claim 7, characterized in that: The upper flask and the lower flask are symmetrically provided with lifting parts.
10. A mold according to claim 7, characterized in that: A step surface is arranged at the peripheral edge of the lower flask, and a limiting ring is arranged at the edge of the lower end surface of the upper flask. When the upper flask is combined with the lower flask, the outer wall of the limiting ring abuts against the step surface.