Ultrahigh thin-wall tin bronze sleeve centrifugal casting mold

Abstract

The utility model discloses an ultrahigh thin-wall tin bronze sleeve centrifugal casting mold, which belongs to the technical field of centrifugal casting and comprises a base, an outer mold, an inner mold and a pressure applying structure, the base is assembled on a vertical centrifugal casting machine, the outer mold and the inner mold are fixedly assembled on the base, the inner mold is positioned on the inner side of the outer mold, the outer mold is formed by splicing four outer molds, and the pressure applying structure is arranged on the outer mold. The outer mold and the inner mold are designed in a sectional mode, the height of the outer mold and the height of the inner mold are small, machining and manufacturing are convenient, stacking and splicing are convenient due to the modularized structure, meanwhile, a self-sealing structure is arranged, and the self-sealing structure is arranged on the outer mold and the inner mold. The inner walls of the outer molds can be guaranteed to be located on the same cylindrical surface, smoothness of the surface of a formed product is guaranteed, a pressure applying structure and a sealing ring are further designed, the pressure applying structure is used for applying pressure to the outer molds and matched with the sealing ring to improve the sealing effect between the outer molds, and then the qualification rate of the product is increased.

Description

Technical Field

[0001] The utility model belongs to the technical field of centrifugal casting, and in particular provides a centrifugal casting mold for an ultra-high thin-wall tin bronze sleeve. Background Art

[0002] As the global mining and aggregate processing industries continue to see growing demand for large-scale crushing equipment, gyratory crushers, with their high processing capacity, intelligent control, and exceptional stability, have become a core component of primary crushing. As a key load-bearing component, the lower frame bushing directly impacts the operating accuracy of the moving cone assembly and the overall machine lifespan. Its performance directly impacts crushing efficiency, maintenance costs, and equipment safety.

[0003] The lower frame bushing of a gyratory crusher has an outer diameter of 1358.77mm, a height of 1416.1mm, and a wall thickness of 29.88mm. This ultra-thin-wall structure is produced using centrifugal casting. Traditional production methods use a one-piece mold that is over 1.5 meters tall. This makes mold production difficult, and the mold's height and weight make installation and demolding difficult during bushing production, significantly impacting production efficiency. Therefore, a centrifugal casting mold for ultra-thin-wall tin bronze bushings is needed that is easy to install and demold, while ensuring product quality. Utility Model Content

[0004] In order to solve the above problems, the utility model provides a centrifugal casting mold for an ultra-high thin-wall tin bronze sleeve.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: an ultra-high thin-walled tin bronze sleeve centrifugal casting mold, comprising a base, an outer mold, an inner mold and a pressure structure, the base being assembled on a vertical centrifugal casting machine, the outer mold and the inner mold being fixedly assembled on the base, and the inner mold being located on the inner side of the outer mold, the outer mold being assembled by four outer molds and a backing plate, and the backing plate being assembled on the upper end face of the uppermost outer mold, the upper wall inner periphery of each outer mold being annularly provided with a connecting groove, the lower wall inner periphery of each outer mold and the lower wall inner periphery of the backing plate being integrally formed with a connecting ring matching the connecting groove, a self-sealing structure and a sealing ring being assembled between the connecting groove and the connecting ring, the pressure structure being fixedly assembled on the upper end of the inner mold, the pressure structure being an annular structure, and an annular cavity being provided inside the pressure structure, and hydraulic oil being added to the annular cavity;

[0006] A pressure chamber is integrally formed in an annular shape on the lower surface of the pressure structure, a push plate is movably installed in the pressure chamber, a connecting rod is fixedly installed on the lower surface of the push plate, the lower end of the connecting rod passes through the pressure chamber and is fixedly installed with a pressure plate, and the pressure plate is located directly above the pad, and a disc spring is installed between the inner wall of the pressure chamber and the push plate.

[0007] Furthermore, an outer mounting platform and an inner mounting platform are integrally formed on the upper surface of the base, the outer mold is assembled on the outer mounting platform, and the inner mold is assembled on the inner mounting platform.

[0008] Furthermore, the outer diameter of the connecting ring is smaller than the diameter of the connecting groove, a self-sealing structure is provided between the connecting groove and the side wall of the connecting ring, corresponding sealing grooves are opened on the end faces of the connecting groove and the connecting ring, and a sealing ring is provided in the sealing groove.

[0009] Furthermore, the self-sealing structure is expanded metal or memory alloy, the side wall of the connecting ring is provided with a self-sealing slot, and the self-sealing structure is arranged in the self-sealing slot.

[0010] Furthermore, flanges are integrally formed at both upper and lower ends of the side wall of the outer mold, the connecting ring of the outer mold at the lowermost side is arranged on the inner wall of the outer mounting platform, and the flange is attached to the upper surface of the outer mounting platform.

[0011] Furthermore, a flange is integrally formed on the side wall of the backing plate, and the backing plate is assembled with the outer mold through the flange, the connecting ring, and the self-sealing structure.

[0012] Furthermore, the inner mold is composed of three inner molds and a transmission mold, and the transmission mold is located at the top. The upper surface of the inner mold and the upper surface of the inner mounting platform are both provided with slots, and the lower surface of the inner mold and the lower surface of the transmission mold are both integrally formed with plug-ins corresponding to the slots.

[0013] Furthermore, the upper end surface of the transmission mold is uniformly provided with mounting grooves, the inner side wall of the pressure structure is uniformly integrally formed with mounting blocks, and the mounting blocks are inserted into the mounting grooves, and the upper end of the transmission mold is equipped with an end cover.

[0014] Furthermore, the inner wall of the transmission mold is evenly provided with downwardly inclined conduit holes, and liquid guide tubes are provided in the conduit holes, and the molten metal flows into between the outer mold and the inner mold through the liquid guide tubes.

[0015] Furthermore, an inclined surface is provided on the upper end of the outer wall of the pressure structure.

[0016] The beneficial effects of using the utility model are:

[0017] The utility model designs the outer mold and the inner mold in sections. The height of the outer mold and the inner mold is low, which is convenient for processing and manufacturing. The modular structure is convenient for stacking and splicing. At the same time, a self-sealing structure is provided to ensure that the inner wall of the outer mold is on the same cylindrical surface, thereby ensuring a smooth surface of the product after molding.

[0018] The utility model also designs a pressure structure and a sealing ring. When the centrifugal casting machine is running, the hydraulic oil in the pressure structure flows outward under the action of centrifugal force and applies pressure to the push plate. Finally, pressure is applied to the outer mold through the pressure plate, and the sealing ring is cooperated to improve the sealing effect between the outer molds, thereby improving the qualified rate of the product.

[0019] The utility model adopts modular design for the outer mold and the inner mold, which can be spliced ​​and combined in different quantities, thereby being able to produce products of different heights and sizes, thereby improving applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional schematic diagram of the present utility model.

[0021] Figure 2 It is a main sectional view of the present utility model.

[0022] Figure 3 For this utility model Figure 2 A partial enlarged view of part a.

[0023] Figure 4 It is a three-dimensional schematic diagram of the base of the utility model.

[0024] Figure 5 It is a three-dimensional schematic diagram of the inner mold of the utility model.

[0025] The accompanying drawings include: 1. base, 11. outer mounting platform, 12. inner mounting platform, 2. outer mold, 21. connecting groove, 22. sealing groove, 3. inner mold, 31. slot, 32. plug-in block, 4. transmission mold, 41. catheter hole, 5. pressure structure, 51. pressure chamber, 52. push plate, 53. connecting rod, 54. pressure plate, 55. disc spring, 56. mounting block, 6. pad, 7. self-sealing structure, 8. sealing ring. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] Reference Figures 1 to 5, a super-high thin-walled tin bronze sleeve centrifugal casting mold, including a base 1, an outer mold, an inner mold and a pressure structure 5. The base 1 is assembled on a vertical centrifugal casting machine. The outer mold and the inner mold are fixedly assembled on the base 1, and the inner mold is located on the inner side of the outer mold. The outer mold is assembled by four outer molds 2 and a pad 6, and the pad 6 is assembled on the upper end face of the uppermost outer mold 2. The inner periphery of the upper wall of each of the outer molds 2 is annularly provided with a connecting groove 21, and the inner periphery of the lower wall of each of the outer molds 2 and the lower wall of the pad are integrally formed with a connecting ring matching the connecting groove 21. A self-sealing structure 7 and a sealing ring 8 are assembled between the connecting groove 21 and the connecting ring. The pressure structure 5 is fixedly assembled on the upper end of the inner mold. The pressure structure 5 is an annular structure, and an annular cavity is opened inside the pressure structure 5, and hydraulic oil is added to the annular cavity.

[0028] The vertical centrifugal casting machine drives the base 1 to rotate, thereby driving the outer mold and the inner mold to rotate, injecting molten metal into the space between the outer mold and the inner mold to perform centrifugal casting. While rotating, the pressure structure 5 converts the centrifugal force into pressure to apply pressure to the outer mold, which can ensure the close fit between the multiple outer molds 2 and ensure the sealing, thereby improving the qualified rate of the casting products.

[0029] The outer mold is composed of multiple outer molds 2 spliced ​​together, so the height of the outer mold 2 is low, the production difficulty is small, the weight of the outer mold 2 is low, and it is easy to move and stack, which facilitates the construction of the mold and the demolding work after casting is completed, and can effectively improve production work efficiency. The docking of two adjacent outer molds 2 is completed by docking the connecting ring and the connecting groove 21.

[0030] The backing plate 6 is provided to protect the outer mold 2 to prevent the outer mold 2 from being damaged by the downward pressure of the pressing plate 54 .

[0031] like Figure 1 and Figure 3 As shown, a pressure chamber 51 is integrally formed in an annular shape on the lower surface of the pressure structure 5, and a push plate 52 is movably installed in the pressure chamber 51. A connecting rod 53 is fixedly installed on the lower surface of the push plate 52. The lower end of the connecting rod 53 passes through the pressure chamber 51 and is fixedly installed with a pressure plate 54, and the pressure plate 54 is located directly above the pad 6. A disc spring 55 is installed between the inner wall of the pressure chamber 51 and the push plate 52, and the upper end of the outer wall of the pressure structure 5 is provided with an inclined surface.

[0032] The hydraulic oil added to the pressure structure 5 occupies 1 / 3 to 1 / 2 of the space, so that it has enough space to move. When the vertical centrifugal casting machine is running, under the action of the centrifugal force generated, the hydraulic oil will flow to the outer ring space within the pressure structure 5 and form a greater pressure. This pressure will push the push plate 52 to overcome the elastic force of the disc spring 55 and move, thereby driving the pressure plate 54 to contact the pad 6 and apply pressure, so that the outer molds 2 fit closely together, improve the sealing, and prevent the metal liquid from seeping into the gap between adjacent outer molds 2 during the molding process, thereby improving the qualified rate of product molding.

[0033] Setting a slope on the surface of the pressure structure 5 will make the upper side of the side wall of the internal annular cavity also a slope, thereby making the annular cavity form a shape with a larger inner cross-sectional area and a smaller outer cross-sectional area. When the hydraulic oil flows outward under the action of centrifugal force, it can provide greater pressure on the push plate 52, and then apply greater pressure to the outer mold through the pressure plate 54.

[0034] There are eight pressure chambers 51 in total, which are evenly distributed on the lower surface of the pressure structure 5 and can evenly apply pressure to the outer mold.

[0035] Specifically, if Figure 4 As shown, an outer mounting platform 11 and an inner mounting platform 12 are integrally formed on the upper surface of the base 1 , the outer mold is assembled on the outer mounting platform 11 , and the inner mold is assembled on the inner mounting platform 12 .

[0036] Specifically, if Figures 1 to 3 As shown, the outer diameter of the connecting ring is smaller than the diameter of the connecting groove 21, a self-sealing structure 7 is provided between the connecting groove 21 and the side wall of the connecting ring, corresponding sealing grooves 22 are opened between the connecting groove 21 and the end face of the connecting ring, and a sealing ring 8 is provided in the sealing groove 22.

[0037] A gap is left between the connecting ring and the connecting groove 21 , and the gap is filled by the self-sealing structure 7 , which is an annular structure.

[0038] When the pressure structure 5 applies pressure to the outer mold 2 , the connecting ring fits tightly against the connecting groove 21 to prevent the molten metal from flowing in.

[0039] The sealing ring 8 is provided to further improve the sealing between the outer molds 2 .

[0040] Specifically, if Figure 3 As shown, the self-sealing structure 7 is made of expanded metal or memory alloy, a self-sealing groove is provided on the side wall of the connecting ring, and the self-sealing structure 7 is arranged in the self-sealing groove.

[0041] The self-sealing structure 7 can use an expansion alloy to expand at high temperature to close the gap between the connecting ring, the connecting groove 21 and the self-sealing structure 7; or a ceramic wear-resistant layer can be coated on the alloy surface, and an initial pre-tightening force is set during installation to make the self-sealing structure 7 produce elastic deformation, and at high temperature, its cross-section is plastically deformed to further compress the connecting ring and the connecting groove 21; the above two situations will eventually fine-tune the position of the outer mold 2 to ensure that the inner walls of each outer mold 2 are smoothly fitted, thereby ensuring that the surface of the product is flat after molding.

[0042] The self-sealing structure 7 can adopt a NiTi memory alloy ring, which is in a pre-compressed state at room temperature. There is a gap between the self-sealing card slot and the surface of the connecting slot 21. When the temperature rises, its volume expands to compensate for the gap and fine-tune the position of the outer mold 2, so that the inner walls of multiple outer molds 2 fit smoothly, thereby ensuring that the surface of the product is flat after molding.

[0043] In this embodiment, no self-sealing slot is provided in the connecting groove 21, and a self-sealing slot is provided only on the connecting ring to facilitate the installation of the connecting ring and the self-sealing structure 7; in other embodiments, a self-sealing slot may also be provided in the connecting groove 21. In this case, in the vertical direction, the length of the self-sealing slot needs to be greater than the length of the self-sealing structure 7, so that when the pressure structure 5 applies pressure, the outer mold 2 can be fine-tuned to achieve a tight fit.

[0044] Specifically, flanges are integrally formed at both upper and lower ends of the side wall of the outer mold 2 , and the connecting ring of the lowermost outer mold 2 is arranged on the inner wall of the outer mounting platform 11 , and the flange is attached to the upper surface of the outer mounting platform 11 .

[0045] The outer molds 2 can be assisted in connection by flanges and bolts and nuts, and the installation of the outer mold 2 on the outer mounting platform 11 can be connected by flanges and bolts and nuts; in addition, a self-sealing structure 7 and a sealing ring 8 can also be set on the inner wall of the outer mounting platform and the upper surface of the base 1.

[0046] Specifically, if Figure 3 As shown, the side wall of the backing plate 6 is integrally formed with a flange, and the backing plate 6 is assembled with the outer mold 2 through the flange, the connecting ring, and the self-sealing structure 7.

[0047] Specifically, the inner mold is composed of three inner molds 3 and a transmission mold 4, and the transmission mold 4 is located at the top. The upper surface of the inner mold 3 and the upper surface of the inner mounting platform 12 are both provided with slots 31, and the lower surface of the inner mold 3 and the lower surface of the transmission mold 4 are both integrally formed with plug blocks 32 corresponding to the slots 31.

[0048] Pin holes are provided at the slots 31 and the inserts 32 of the inner mold 3. The pin holes can be round holes or square holes. The outer opening area of ​​the pin holes is larger than the inner opening area. When the connection between the inner molds 3, the inner mold 3 and the transmission mold 4, and the inner mold 3 and the inner mounting platform 12 is completed, a pin can be inserted into the pin hole. The shape of the pin is thick outside and thin inside, which realizes the fixation of the inner mold 3 and the transmission mold 4. When the vertical centrifugal casting machine is running, the centrifugal force will cause the pin to be effectively inserted into the pin hole, ensuring the tightness of the connection between the inner mounting platform 12, the inner mold 3, and the transmission mold 4.

[0049] Specifically, if Figure 5 As shown, the upper end surface of the transmission mold 4 is uniformly provided with mounting grooves, the inner side wall of the pressure structure 5 is uniformly integrally formed with mounting blocks 56, and the mounting blocks 56 are inserted into the mounting grooves, and the upper end of the transmission mold 4 is equipped with an end cover.

[0050] When the transmission mold 4 rotates, it can drive the pressure structure 5 to rotate. The position of the pressure structure 5 can be limited by the end cover, wherein the end cover is not drawn in the drawings.

[0051] Specifically, if Figure 5 As shown, the inner wall of the transmission mold 4 is evenly provided with downwardly inclined conduit holes 41 , and a liquid guide tube is provided in the conduit hole 41 , and the molten metal flows into between the outer mold and the inner mold through the liquid guide tube.

[0052] A rotating tube is provided directly above the center of the base 1. The upper end of the rotating tube is rotatably assembled on the lower end of the molten metal conduit, and the two are connected. A plurality of liquid guide tubes are separated from the lower end of the rotating tube. The liquid guide tubes pass through the conduit holes 41 toward the space between the outer mold and the inner mold. The rotating tube and the liquid guide tube are metal tubes that can rotate with the rotation of the transmission mold 4, and guide the molten metal between the outer mold and the inner mold during the rotation process.

[0053] The steps for using this ultra-high thin-walled tin bronze sleeve centrifugal casting mold are as follows:

[0054] Step 1: Install the mold. Install four outer molds 2 and three inner molds 3 in sequence. Install a backing plate on the upper end of the outer molds 2, install a transmission mold 4 on the upper end of the inner molds 3, install a pressure structure 5 and an end cap on the upper end of the transmission mold 4, and then pass the catheter through the catheter hole 41.

[0055] Step 2: Sealing the mold. The vertical centrifugal casting machine is operated at a low speed to rotate the outer mold and the inner mold. The centrifugal force generated causes the hydraulic oil in the pressure structure 5 to flow outward, exerting pressure on the push plate 52 and causing it to move. Finally, the pressure plate 54 contacts the surface of the backing plate 6 and applies pressure, so that the outer mold 2 is tightly fitted and the seal is completed.

[0056] Step 3: Casting. Open the valve of the molten metal conduit. The molten metal flows into the space between the outer mold and the inner mold through the molten metal conduit, the rotating pipe, and the liquid guide pipe. The molten metal is rotated and formed under the action of the vertical centrifugal casting machine. At the same time, heat is transferred to the outer mold, causing the self-sealing structure 7 to deform, further improving the sealing effect. The position of the outer mold 2 is fine-tuned to ensure that the inner wall of the outer mold 2 is smoothly connected. Then, the speed of the vertical centrifugal casting machine is increased to the set speed.

[0057] Step 4: demoulding. After the pouring work is completed, first remove the end cover and the pressure structure 5, then remove the outer mold 2, the transmission mold 4, and the inner mold 3 in turn, and finally take out the cast product.

[0058] The above content is only a preferred embodiment of the present invention. For ordinary technicians in this field, many changes can be made in the specific implementation methods and application scope based on the concept of the present invention. As long as these changes do not deviate from the concept of the present invention, they all fall within the scope of protection of the present invention.

Claims

1. A centrifugal casting mold for an ultra-thin-walled tin bronze sleeve, characterized by: The invention comprises a base, an outer mold, an inner mold and a pressure structure, wherein the base is assembled on a vertical centrifugal casting machine, the outer mold and the inner mold are fixedly assembled on the base, and the inner mold is located on the inner side of the outer mold, the outer mold is assembled by four outer molds and a backing plate, and the backing plate is assembled on the upper end surface of the uppermost outer mold, the inner periphery of the upper wall of each outer mold is annularly provided with a connecting groove, the inner periphery of the lower wall of each outer mold and the inner periphery of the lower wall of the backing plate are integrally formed with a connecting ring matching the connecting groove, a self-sealing structure and a sealing ring are assembled between the connecting groove and the connecting ring, the pressure structure is fixedly assembled on the upper end of the inner mold, the pressure structure is an annular structure, and an annular cavity is opened inside the pressure structure, and hydraulic oil is added to the annular cavity; A pressure chamber is integrally formed in an annular shape on the lower surface of the pressure structure, a push plate is movably installed in the pressure chamber, a connecting rod is fixedly installed on the lower surface of the push plate, the lower end of the connecting rod passes through the pressure chamber and is fixedly installed with a pressure plate, and the pressure plate is located directly above the pad, and a disc spring is installed between the inner wall of the pressure chamber and the push plate.

2. The ultra-thin-wall tin bronze sleeve centrifugal casting mold according to claim 1, characterized in that: An outer mounting platform and an inner mounting platform are integrally formed on the upper surface of the base. The outer mold is assembled on the outer mounting platform, and the inner mold is assembled on the inner mounting platform.

3. The ultra-thin-wall tin bronze sleeve centrifugal casting mold according to claim 1, characterized in that: The outer diameter of the connecting ring is smaller than the diameter of the connecting groove. A self-sealing structure is provided between the connecting groove and the side wall of the connecting ring. Corresponding sealing grooves are provided on the end faces of the connecting groove and the connecting ring. A sealing ring is provided in the sealing groove.

4. The ultra-thin-wall tin bronze sleeve centrifugal casting mold according to claim 1, characterized in that: The self-sealing structure is made of expanded metal or memory alloy. A self-sealing slot is provided on the side wall of the connecting ring, and the self-sealing structure is arranged in the self-sealing slot.

5. The ultra-thin-wall tin bronze sleeve centrifugal casting mold according to claim 1, characterized in that: Flanges are integrally formed at both upper and lower ends of the side wall of the outer mold, and the connecting ring of the outer mold at the lowermost side is arranged on the inner wall of the outer mounting platform, and the flange is attached to the upper surface of the outer mounting platform.

6. The ultra-thin-wall tin bronze sleeve centrifugal casting mold according to claim 5, characterized in that: The side wall of the backing plate is integrally formed with a flange, and the backing plate is assembled with the outer mold through the flange, the connecting ring and the self-sealing structure.

7. The ultra-thin-wall tin bronze sleeve centrifugal casting mold according to claim 2, characterized in that: The inner mold is composed of three inner molds and a transmission mold, and the transmission mold is located at the top. The upper surface of the inner mold and the upper surface of the inner mounting platform are both provided with slots, and the lower surface of the inner mold and the lower surface of the transmission mold are both integrally formed with plug-ins corresponding to the slots.

8. The ultra-thin-wall tin bronze sleeve centrifugal casting mold according to claim 7, characterized in that: The upper end surface of the transmission mold is evenly provided with mounting grooves, the inner side wall of the pressure structure is evenly integrally formed with mounting blocks, and the mounting blocks are inserted into the mounting grooves, and the upper end of the transmission mold is equipped with an end cover.

9. The ultra-thin-wall tin bronze sleeve centrifugal casting mold according to claim 7, characterized in that: The inner wall of the transmission mold is evenly provided with downwardly inclined conduit holes, and liquid guide tubes are arranged in the conduit holes, and the molten metal flows into between the outer mold and the inner mold through the liquid guide tubes.

10. The ultra-thin-wall tin bronze sleeve centrifugal casting mold according to claim 1, characterized in that: An inclined surface is provided on the upper end of the outer wall of the pressure structure.

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