A cold core rotating drop-off core box

Abstract

The utility model relates to cold -core machine sand core stripping technical field, the utility model provides a cold -core rotation falls off formula core box, it includes lower mould, has the recess, a plurality of loose pieces can be placed in the recess and can be dismantled, and a plurality of loose pieces are formed along the inner wall circumferential splicing of recess annular body, the inside of annular body is enclosed and is formed the mould cavity for forming sand core, the mould cavity inner wall has a plurality of vertical extension spiral guide groove, spiral guide groove can form the spiral convex edge of adaptation with spiral guide groove after sand core in mould cavity, and the outer peripheral wall of sand core corresponds, wherein, recess bottom is provided with through -hole, through -hole is connected with recess, through -hole is configured to pass through the top rod, the top rod can push sand core, to make sand core spiral convex edge push spiral guide groove, a plurality of loose pieces can rotate and fall off under the action of spiral guide groove and spiral convex edge after moving out recess. The technical problem that sand core is not easy to strip in the prior art is solved.

Description

Technical Field

[0001] This utility model relates to the field of core demolding technology for cold core machines, specifically to a rotating and detachable core box for cold cores. Background Technology

[0002] Cold core technology is widely used in the mass production of sand cores due to its advantages such as high core-making efficiency, high sand core strength, and good dimensional accuracy.

[0003] However, the cold core process currently used in foundries is limited by the inherent structure of the cold core machine, and its demolding method is relatively fixed. This results in many restrictions on the forming structure of sand cores, especially making it difficult to directly produce sand cores with complex structures, which greatly limits the application range of the cold core process in the production of complex castings. To overcome the above-mentioned limitations in sand core structure forming, for complex parts of the sand core that affect demolding, the industry generally adopts the method of setting up movable blocks in the cold core mold to assist demolding. That is, the movable block and the mold body form a complete sand core forming cavity. After the sand core is formed, the movable block is removed first, and then the entire sand core is demolded.

[0004] However, the cold core machine requires a high pressure of 0.4-0.6 MPa during the sand injection process to ensure the compactness of the sand core. Under this high pressure, the sand core exerts a tremendous clamping force on the mold block, greatly increasing the difficulty of manually removing and placing the mold block after the sand core is formed, and the process is also time-consuming. This problem not only significantly reduces the overall core-making efficiency and increases the labor intensity of operators, but also may cause damage to the sand core or mold block due to improper handling, further affecting production quality and cost control. Utility Model Content

[0005] To overcome the above-mentioned defects, the embodiments of this utility model provide a cold core rotating and detachable core box, which solves the technical problem that sand cores are not easy to demold in the prior art.

[0006] According to one aspect, at least one embodiment of the present invention provides a cold-core rotary release core box for sand core molding and demolding via an ejector pin, comprising: The lower mold has a groove; The device has several movable blocks, each of which can be detached and placed in the groove. The movable blocks are spliced ​​together along the inner wall of the groove to form an annular body. The inner side of the annular body encloses a mold cavity for forming a sand core. The inner wall of the mold cavity has several vertically extending spiral guide grooves. After the sand core is formed in the mold cavity, the spiral guide grooves can make the outer peripheral wall of the sand core corresponding to form a spiral protrusion that matches the spiral guide groove. The groove has a through hole at the bottom, which communicates with the groove. The through hole is configured to allow the push rod to pass through. The push rod can push the sand core so that the spiral protrusion of the sand core pushes the spiral guide groove. Several movable blocks can rotate and fall off under the action of the spiral guide groove and the spiral protrusion after moving out of the groove.

[0007] Optionally, the movable block includes multiple core-covered movable blocks and two main movable blocks. The multiple core-covered movable blocks are detachably spliced ​​onto the two main movable blocks. The splicing surface of the two main movable blocks is an inclined surface with an inclination angle of 35°.

[0008] Optionally, the through holes are of several kinds, and the through holes are divided into a first through hole for corresponding to the sand core and a second through hole for corresponding to the main body block.

[0009] Optionally, there are several push rods, and each push rod corresponds to one of the through holes. The push rods are divided into a first push rod for pushing the sand core and a second push rod for pushing the main movable block.

[0010] Optionally, the bottom surface of the annular body has an opening, which is arranged opposite to and communicates with the first through hole, and the first push rod can extend into the mold cavity through the opening to push the sand core.

[0011] Optionally, the length of the first push rod is 5 mm longer than the length of the second push rod.

[0012] Optional, also includes: The upper mold is detachably mounted on the lower mold, and the upper mold has a sand-shooting hole.

[0013] Optionally, both the core-head covering block and the main body block have splicing convex surfaces and splicing concave surfaces.

[0014] Optionally, the lower mold has a limiting groove at the corner of the inner wall of the groove.

[0015] The beneficial effects of this utility model are as follows: In this invention, during operation, several movable blocks are first placed sequentially according to the positions of the holes and grooves on the inner circumference of the groove and then assembled to form a ring. At this time, a complete mold cavity is formed inside the ring. Subsequently, sand is injected to form a sand core within the mold cavity. Through the reserved spiral guide groove, the outer peripheral wall of the sand core forms a spiral protrusion that matches the spiral guide groove. After the sand core is formed, it should be noted that the sand core has high strength at this time, so it will not be damaged during demolding. During demolding, the ejector rod passes through the through hole and pushes the sand core. The spiral protrusion on the sand core then pushes the spiral guide groove on the inner wall of the mold cavity. As the movable blocks move out of the groove, they rotate circumferentially under the combined action of the spiral guide groove and the spiral protrusion and fall off the sand core. After that, the sand core is completely demolded.

[0016] The combination of the spiral guide groove and the spiral convex edge allows the movable block to rotate and fall off automatically under the pushing action of the top rod, eliminating the need for manual handling of the movable block and effectively reducing the labor intensity of operators. It also avoids the problem of long time-consuming manual handling of the movable block, significantly improving the overall core-making efficiency. At the same time, it reduces the possibility of damage to the sand core or movable block caused by improper handling, ensuring production quality, facilitating cost control, and breaking through the limitations of complex sand core forming. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this utility model and these drawings without any creative effort.

[0018] Figure 1 This is a schematic diagram of the upper and lower molds in one embodiment of the present invention; Figure 2 for Figure 1 A schematic diagram of the structure of the sand core in the embodiment; Figure 3 for Figure 1 A schematic diagram of the structure of the lower mold, sand core, and ring body in the embodiment; Figure 4 for Figure 1 A schematic diagram of the structure of the bottom surface of the lower mold in the embodiment; Figure 5 for Figure 1 A schematic diagram of the top rod structure in the embodiment; Figure 6 for Figure 1 A schematic diagram of the internal structure of the groove in the embodiment; Figure 7 for Figure 1A schematic diagram of the structure with an opening at the bottom of the annular body in the embodiment; Figure 8 for Figure 1 A schematic diagram of the splicing surface in the embodiment; Figure 9 for Figure 1 The above is a schematic diagram of the upper mold in the embodiment.

[0019] In the diagram: 1. Sand core, 101. Spiral protrusion, 2. Ejector rod, 21. First ejector rod, 22. Second ejector rod, 3. Lower mold, 31. Groove, 32. Limiting groove, 33. Through hole, 331. First through hole, 332. Second through hole, 4. Protrusion, 5. Ring body, 50. Movable block, 51. Main movable block, 510. Splicing surface, 52. Core head covering movable block, 53. Splicing convex surface, 54. Splicing concave surface, 55. Opening, 6. Upper mold, 61. Sand injection hole. Detailed Implementation The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit its scope.

[0020] To keep the drawings concise, only the parts relevant to the utility model are shown schematically in each drawing; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of the components with the same structure or function is schematically shown, or only one is labeled. In this document, "a" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0021] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0023] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0025] like Figures 1-9 As shown, this invention illustrates a cold-core rotary detachable core box according to one embodiment of the present invention, used for molding sand core 1 and demolding via a push rod 2. It includes a lower mold 3 with a groove 31 inside; several movable blocks 50 are present, each detachably placed within the groove 31, and the movable blocks 50 are circumferentially joined along the inner wall of the groove 31 to form an annular body 5. The inner side of the annular body 5 encloses a mold cavity for molding the sand core 1, and the inner wall of the mold cavity has several vertically extending spiral guide grooves. After the spiral guide groove forms the sand core 1 in the mold cavity, it can make the outer peripheral wall of the sand core 1 form a spiral protrusion 101 that is compatible with the spiral guide groove. The bottom of the groove 31 is provided with a through hole 33, which is connected to the groove 31. The through hole 33 is configured to allow the push rod 2 to pass through. The push rod 2 can push the sand core 1 so that the spiral protrusion 101 of the sand core 1 pushes the spiral guide groove. Several movable blocks 50 can be moved out of the groove 31 and then rotated and fell off under the action of the spiral guide groove and the spiral protrusion 101.

[0026] In the above scheme, during operation, several movable blocks 50 are first placed sequentially according to the positions of the holes and grooves on the inner circumference of the groove 31 and then spliced ​​to form an annular body 5. At this time, a complete mold cavity is formed on the inner side of the annular body 5. Then, sand is shot to form the sand core 1 in the mold cavity. Through the reserved spiral guide groove, the outer peripheral wall of the sand core 1 is formed with a spiral protrusion 101 that matches the spiral guide groove. After the sand core 1 is formed, it should be noted that the sand core 1 has high strength at this time, so the sand core 1 will not be damaged during demolding. During demolding, the ejector rod 2 pushes the sand core 1 through the through hole 33. The spiral protrusion 101 on the sand core 1 pushes the spiral guide groove on the inner wall of the mold cavity. During the process of the several movable blocks 50 moving out of the groove 31, they rotate circumferentially under the cooperation of the spiral guide groove and the spiral protrusion 101 and fall off the sand core 1. Then the sand core 1 is demolded as a whole.

[0027] The cooperation between the spiral guide groove and the spiral protrusion 101 allows the movable block 50 to automatically rotate and fall off under the pushing action of the push rod 2, eliminating the need for manual handling of the movable block 50 and effectively reducing the labor intensity of operators; it avoids the problem of long time consumption of manual handling of the movable block 50, significantly improving the overall core-making efficiency; at the same time, it reduces the possibility of damage to the sand core 1 or the movable block 50 due to improper handling, ensuring production quality, facilitating cost control, and breaking through the limitations of complex sand core 1 molding.

[0028] Furthermore, the movable block 50 is composed of multiple core-head covered movable blocks 52 and two main movable blocks 51. The multiple core-head covered movable blocks 52 can be detachably spliced ​​onto the two main movable blocks 51. The splicing surface 510 where the two main movable blocks 51 are spliced ​​together is a slope, and the angle of inclination of the splicing surface 510 is 35°.

[0029] In the above scheme, during assembly, the two main movable blocks 51 are first placed at the bottom of the inner side of the groove 31. The side walls of the two main movable blocks 51 have inclined splicing surfaces 510. The splicing of the two main movable blocks 51 is completed by the interlocking of the inclined splicing surfaces 510. Then, multiple core-head covering movable blocks 52 are detachably spliced ​​onto the two main movable blocks 51 to form an annular body 5 and enclose the mold cavity. After sand injection molding, when the push rod 2 pushes the sand core 1, the spiral protrusion 101 drives the spiral guide groove to move the main movable block 51 and the core-head covering movable block 52 upward together. Under the action of the spiral, the two main movable blocks 51 naturally separate along the inclined splicing surfaces 510, and the core-head covering movable block 52 also separates from the main movable block 51 and falls off the sand core 1.

[0030] The movable block 50 is divided into a core-head covering movable block 52 and a main movable block 51. The main movable block 51 is spliced ​​with an inclined surface, which makes the splicing and separation of the movable block 50 smoother and further reduces the difficulty of detachment. The setting of the core-head covering movable block 52 can better adapt to the complex structure of the core head of the sand core 1 and improve the molding quality of the complex sand core 1. The detachable splicing method facilitates the replacement and maintenance of the movable block 50, increases the versatility of the device, and can adapt to the production needs of sand cores 1 with different structures.

[0031] Furthermore, several through holes 33 are provided. These through holes 33 are divided into two categories: first through holes 331 and second through holes 332. The position of the first through hole 331 corresponds to the sand core 1, and the position of the second through hole 332 corresponds to the main movable block 51. All through holes 33 are connected to the groove 31.

[0032] In the above scheme, after the assembled movable block 50 forms a mold cavity, sand is shot. After the sand core 1 is formed, the ejector rod 2 passes through the corresponding first through hole 331 and second through hole 332 respectively. The ejector rod 2 passing through the first through hole 331 acts on the sand core 1, and the ejector rod 2 passing through the second through hole 332 acts on the main movable block 51. Under the synchronous pushing action of the ejector rod 2, the sand core 1 and the main movable block 51 move upward together. After being freed from the restriction of the groove 31, the movable block 50 is rotated and detached in conjunction with the spiral guide groove and the spiral protrusion 101.

[0033] Dividing the through hole 33 into two categories corresponding to the sand core 1 and the main movable block 51 allows the push rod 2 to act precisely on the sand core 1 and the main movable block 51, ensuring the accurate transmission of the pushing force. This avoids the problem of uneven force that may be caused by pushing through a single through hole 33, making the movement of the sand core 1 and the movable block 50 more synchronized and stable, reducing the risk of damage to the sand core 1 or the movable block 50 during the movement, and further improving the stability and reliability of core making.

[0034] Furthermore, there are several push rods 2, and each push rod 2 corresponds to a certain number of through holes 33. The push rods 2 are divided into a first push rod 21 and a second push rod 22. The first push rod 21 is used to push the sand core 1, and the second push rod 22 is used to push the main body movable block 51. The first push rod 21 is adapted to the first through hole 331, and the second push rod 22 is adapted to the second through hole 332.

[0035] In the above scheme, after the sand core 1 is formed, the jacking mechanism, such as a hydraulic cylinder, is activated, causing the first jacking rod 21 to pass through the first through hole 331 and the second jacking rod 22 to pass through the second through hole 332. The first jacking rod 21 directly contacts the sand core 1 and applies a jacking force, while the second jacking rod 22 directly contacts the main movable block 51 and applies a jacking force. The two types of jacking rods 2 move synchronously, jointly driving the sand core 1 and the main movable block 51 upward. Under the action of the spiral guide groove and the spiral protrusion 101, the movable block 50 rotates and falls off. The jacking rods 2 correspond one-to-one with the through holes 33 and are classified, making the target of each jacking rod 2 clear and the jacking more targeted; it can ensure that the sand core 1 and the main movable block 51 receive a balanced jacking force, avoiding damage caused by excessive local force, while ensuring the coordination of their movement, making the process of the movable block 50 rotating and falling off smoother, and further improving the core-making efficiency and quality.

[0036] Furthermore, the bottom surface of the annular body 5 is provided with an opening 55, the position of which corresponds to the first through hole 331, and the opening 55 is connected to the first through hole 331. The first push rod 21 can pass through the first through hole 331 and then extend into the mold cavity inside the annular body 5 through the opening 55, thereby contacting the sand core 1.

[0037] In the above scheme, after the spliced ​​movable block 50 forms an annular body 5, the opening 55 on the bottom surface of the annular body 5 is aligned with the first through hole 331 on the lower mold 3. After sand injection molding, the first ejector rod 21 extends from the first through hole 331, passes through the opening 55, directly enters the mold cavity and contacts the sand core 1, applying a pushing force. At the same time, the second ejector rod 22 pushes the main movable block 51, jointly driving the sand core 1 and the movable block 50 to move upward, so that the movable block 50 can rotate and fall off. The setting of the opening 55 allows the first ejector rod 21 to directly extend into the mold cavity and contact the sand core 1, shortening the force transmission path of the ejector rod 2, making the pushing force more direct and efficient, avoiding the force loss or unstable pushing problems that may be caused by indirect pushing; ensuring the reliability of the first ejector rod 21 pushing the sand core 1, further improving the smoothness of the movable block 50 rotating and falling off, and ensuring core making efficiency.

[0038] Furthermore, the length of the first push rod 21 is greater than the length of the second push rod 22, and there is a fixed length difference between them. This length difference allows the first push rod 21 and the second push rod 22 to form a specific action sequence during the jacking process. Specifically, the length of the first push rod 21 is 260mm, and the length of the second push rod 22 is 255mm.

[0039] In the above scheme, after the jacking mechanism is started, since the first jacking rod 21 is longer, it will first pass through the first through hole 331 and the opening 55 to contact the sand core 1 and begin to apply jacking force, causing the sand core 1 to first produce a slight displacement and form a force with the spiral structure of the movable block 50; then the second jacking rod 22 will contact the main movable block 51 and apply jacking force, causing the movable block 50 to move upward with the sand core 1, and rotate and fall off under the spiral guidance.

[0040] By setting the length difference of the push rod 2 to form a sequential pushing order, the sand core 1 first interacts with the movable block 50, creating the initial conditions for the rotation and detachment of the movable block 50, avoiding the jamming problem that may be caused by the two being subjected to force at the same time; making the rotation and detachment of the movable block 50 more stable and smooth, reducing friction and collision during the movement, reducing the risk of damage to the sand core 1 or the movable block 50, and improving production stability.

[0041] Specifically, the main movable block 51 and the sand core 1 are simultaneously pushed out by the push rod 2 and the hydraulic cylinder. The movable block 50 and the sand core 1 are pushed out by the different heights of the second push rod 22 and the first push rod 21. The pushing speed is adjusted by the guide groove of the sand core 1 itself, so that the main movable block 50 on the surface of the sand core 1 rotates and falls off, saving the time of removing the movable block 50 and improving production efficiency.

[0042] Furthermore, it also includes an upper mold 6, which has a protruding edge 4 that abuts against the lower mold 3. The upper mold 6 is detachably mounted on the lower mold 3. The upper mold 6 has sand-shooting holes 61. The upper mold 6 is used to contact the upper core plate and sand-shooting plate of the cold core machine. Several sand-shooting holes 61 on the upper mold 6 are evenly arranged to facilitate sand shooting.

[0043] Furthermore, both the core-head covering block 52 and the main block 51 have splicing convex surfaces 53 and splicing concave surfaces 54, which not only facilitates firm splicing but also makes it easy to rotate and separate.

[0044] Furthermore, the lower mold 3 has a limiting groove 32 at the corner of the inner wall of the groove 31. The limiting groove 32 facilitates the placement of the main body block 51.

[0045] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A cold-core rotary release core box, used for sand core (1) molding and demolding via a push rod (2), characterized in that, include: The lower mold (3) has a groove (31); The movable block (50) has several, and each of the movable blocks (50) can be detached and placed in the groove (31). The movable blocks (50) are spliced ​​together along the inner wall of the groove (31) to form an annular body (5). The inner side of the annular body (5) surrounds and forms a mold cavity for forming a sand core (1). The inner wall of the mold cavity has several vertically extending spiral guide grooves. After the sand core (1) is formed in the mold cavity, the spiral guide grooves can make the outer peripheral wall of the sand core (1) corresponding to form a spiral protrusion (101) that matches the spiral guide groove. The groove (31) has a through hole (33) at the bottom, which is connected to the groove (31). The through hole (33) is configured to allow the push rod (2) to pass through. The push rod (2) can push the sand core (1) so that the spiral protrusion (101) of the sand core (1) pushes the spiral guide groove. Several movable blocks (50) can rotate and fall off under the action of the spiral guide groove and the spiral protrusion (101) after moving out of the groove (31).

2. The cold-core rotary detachable core box according to claim 1, characterized in that, The movable block (50) includes multiple core-head covered movable blocks (52) and two main movable blocks (51). The multiple core-head covered movable blocks (52) are detachably spliced ​​on the two main movable blocks (51). The splicing surface (510) of the two main movable blocks (51) is an inclined surface with an inclination angle of 35°.

3. A cold-core rotary detachable core box according to claim 2, characterized in that, The through holes (33) are a plurality of, and the through holes (33) are divided into a first through hole (331) for corresponding to the sand core (1) and a second through hole (332) for corresponding to the main body block (51).

4. A cold-core rotary detachable core box according to claim 3, characterized in that, There are several top rods (2), and each top rod (2) corresponds to a through hole (33). The top rods (2) are divided into a first top rod (21) for pushing the sand core (1) and a second top rod (22) for pushing the main movable block (51).

5. A cold-core rotary detachable core box according to claim 4, characterized in that, The bottom surface of the annular body (5) has an opening (55), which is arranged opposite to and connected to the first through hole (331). The first push rod (21) can extend into the mold cavity through the opening (55) to push the sand core (1).

6. A cold-core rotary detachable core box according to claim 4, characterized in that, The length of the first push rod (21) is 5 mm longer than the length of the second push rod (22).

7. A cold-core rotary detachable core box according to claim 1, characterized in that, Also includes: The upper mold (6) is detachably mounted on the lower mold (3), and the upper mold (6) has a sand-shooting hole (61).

8. A cold-core rotary detachable core box according to claim 2, characterized in that, Both the core-head covering block (52) and the main block (51) have splicing convex surfaces (53) and splicing concave surfaces (54).

9. A cold-core rotary detachable core box according to claim 1, characterized in that, The lower mold (3) has a limiting groove (32) at the corner of the inner wall of the groove (31).

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