Sand casting bottom plate mold

Abstract

The utility model relates to the technical field of molds, discloses a sand mold casting bottom plate mold, and solves the problems that the stability is poor when an existing sand mold adopts a plug connector for plugging and fixing, a gap is formed between the plug connector and a plugging hole due to the tolerance between the plug connector and the plugging hole, and the mold is loosened due to buoyancy when molten iron or other liquid is injected into the mold, so that the mold is damaged. The mold comprises an upper mold, a lower mold is arranged on the lower portion of the upper mold, two supporting arms are fixedly installed on the two sides of the upper mold respectively, inserting rods are fixedly installed at the bottoms of the four supporting arms respectively, two butt joint blocks are fixedly installed on the upper portions of the two sides of the lower mold respectively, inserting holes are formed in the four butt joint blocks respectively, and the inserting rods are inserted into the inserting holes. The four inserting rods are inserted into the four inserting holes, and openings are formed in the lower parts of the four inserting rods; the connection mode of the sand mold can avoid a gap between the upper mold and the lower mold, so that looseness between the upper mold and the lower mold is avoided, and the forming quality of a product is guaranteed.

Description

Technical Field

[0001] This utility model belongs to the field of mold technology, specifically a sand casting base plate mold. Background Technology

[0002] Sand molds are casting molds made primarily of sand, bonded together with adhesives to form the desired shape. They are characterized by low cost, short production cycle, and wide applicability. Made of refractory materials, they can withstand the impact and high temperatures of molten metal. During the casting process, their cavity and core together constitute the external shape and internal structure of the casting. Sand molds can be classified into wet sand molds, dry sand molds, and chemically bonded sand molds, and are suitable for casting steel, iron, and most non-ferrous alloys. In terms of application, sand molds are widely used in machinery manufacturing, the automotive industry, and other fields; for example, in the production of machine tool beds, housings, bases, and other mechanical parts, as well as automotive engine blocks, intake manifolds, cylinder heads, and transmissions. They are an indispensable key tool in the sand casting process.

[0003] An existing patent (publication number: CN218361949U) discloses a sand casting mold. When using this sand casting mold, sand may be rubbed off when it is flipped or lifted, or when the mold is not placed flat, affecting the quality of the finished product and increasing the subsequent processes and costs. However, the stability of the sand mold is poor due to the use of plug-in fasteners. There is a tolerance between the plug-in and the plug hole, which creates a gap between the two, causing loosening between the upper and lower molds. Consequently, when molten iron or other liquids are injected into the mold, the buoyancy will cause the mold to loosen, affecting the molding quality of the product. Utility Model Content

[0004] In order to overcome the defects of the prior art, this utility model provides a sand casting base plate mold, which effectively solves the problems of poor stability of existing sand molds that use plug-in connectors for fixing, the tolerance between the plug-in connectors and the plug-in holes, which results in gaps between the two. When molten iron or other liquids are injected into the mold, the buoyancy will cause the mold to loosen, affecting the product molding quality.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a sand casting base plate mold, including an upper mold and a lower mold at the lower part of the upper mold. Two support arms are fixedly installed on both sides of the upper mold, and insert rods are fixedly installed at the bottom of each of the four support arms. Two docking blocks are fixedly installed on the upper part of both sides of the lower mold, and each of the four docking blocks has an insertion hole. The four insert rods are inserted into the four insertion holes. Each of the four insert rods has an opening at the lower part, and rollers are rotatably installed in the lower part of each of the four openings. Two pushing strips are respectively provided on the lower part of both sides of the lower mold. A handwheel is provided at the lower part of the front of the lower mold, and a transmission component is provided on one side of the handwheel. The transmission component is connected to the four pushing strips. When the handwheel rotates, the power is output to the four pushing strips through the transmission component, causing the four pushing strips to push the four rollers downward.

[0006] Preferably, the transmission assembly includes a shaft, which is fixedly installed on one side of the handwheel. Two bushings are rotatably installed on the surface of the shaft. Both bushings are fixedly connected to the bottom of the lower mold through a fixing rod. A driving bevel gear is fixedly installed at one end of the shaft, and a driven bevel gear is meshed with one side of the surface of the driving bevel gear.

[0007] Preferably, a rotating shaft is fixedly installed in the middle of the driven bevel gear. The surface of the rotating shaft is rotatably connected to the bottom of the lower mold through two bearings. Threaded rods are fixedly installed at both ends of the rotating shaft. Positioning frames are rotatably installed at the ends of the two threaded rods that are far apart from each other through a shaft seat. The sides of the two positioning frames that are close to each other are fixedly connected to the lower mold.

[0008] Preferably, each of the threaded rods has a threaded sleeve threaded to its surface, and the threads of the two threaded rods are in opposite directions. A support rod is fixedly installed on the top of each threaded sleeve, and a connecting arm is fixedly installed on the top of each support rod. The two ends of the two connecting arms that are far apart from each other are respectively fixedly connected to four push bars. Slide rods are movably inserted into both ends of the surfaces of the two connecting arms, and one end of each slide rod is fixedly connected to the lower mold.

[0009] Compared with the prior art, the beneficial effects of this utility model are as follows: When in use, the operator closes the upper mold onto the lower mold, and at the same time inserts the four rods into the four holes on the four mating blocks through the four support arms. Then, the handwheel drives the shaft to rotate inside the two bushings. When the shaft rotates, the active bevel gear drives the driven bevel gear to rotate. When the driven bevel gear rotates, it drives the rotating shaft to rotate inside the four bearings. When the rotating shaft rotates, it drives the two threaded rods to rotate along the two shaft seats on the two positioning frames. Since the thread directions of the two threaded rods are opposite, the rotation of the two threaded rods will drive the two threaded sleeves to move in opposite directions.

[0010] When the two threaded sleeves move in opposite directions, they drive the two connecting arms to move in opposite directions via two support rods. Both connecting arms slide along the surface of the slide bar during movement, increasing stability. As the two connecting arms move in opposite directions, they extend into the opening via a pushing strip, allowing the rollers to smoothly compress the insert rods downwards. When the four insert rods move downwards, they drive the upper mold to press firmly against the upper part of the lower mold via four support arms, preventing gaps between the upper and lower molds and ensuring the quality of the molded product. Attached Figure Description

[0011] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.

[0012] In the attached diagram:

[0013] Figure 1 This is a schematic diagram of the sand casting base plate mold structure of this utility model. Figure 1 ;

[0014] Figure 2 This is a schematic diagram of the sand casting base plate mold structure of this utility model. Figure 2 ;

[0015] Figure 3 This is a schematic diagram of the sand casting base plate mold structure of this utility model. Figure 3 ;

[0016] Figure 4 This is a schematic diagram of the sand casting base plate mold structure of this utility model. Figure 4 ;

[0017] In the diagram: 1. Upper mold; 2. Lower mold; 3. Support arm; 4. Insert rod; 5. Connecting block; 6. Insertion hole; 7. Opening; 8. Roller; 9. Push bar; 10. Handwheel; 11. Slide rod; 12. Shaft; 13. Bushing; 14. Fixing rod; 15. Driving bevel gear; 16. Driven bevel gear; 17. Rotating shaft; 18. Bearing; 19. Threaded rod; 20. Shaft seat; 21. Positioning frame; 22. Threaded sleeve; 23. Support rod; 24. Connecting arm. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0019] Depend on Figures 1 to 4 The present invention includes an upper mold 1, a lower mold 2 at the lower part of the upper mold 1, two support arms 3 fixedly installed on both sides of the upper mold 1, and insertion rods 4 fixedly installed at the bottom of each of the four support arms 3. Two docking blocks 5 are fixedly installed on the upper part of both sides of the lower mold 2, and insertion holes 6 are opened on each of the four docking blocks 5. The four insertion rods 4 are inserted into the four insertion holes 6. The lower part of each of the four insertion rods 4 has an opening 7. Rollers 8 are rotatably installed in the lower part of each of the four openings 7. Two pushing strips 9 are respectively provided on the lower part of both sides of the lower mold 2. A handwheel 10 is provided at the lower part of the front of the lower mold 2. A transmission component is provided on one side of the handwheel 10. The transmission component is connected to the four pushing strips 9. When the handwheel 10 rotates, the power is output to the four pushing strips 9 through the transmission component, causing the four pushing strips 9 to push the four rollers 8 downward. A material valve for material injection is provided at the upper part of the front of the upper mold 1.

[0020] In use, the operator closes the upper mold 1 onto the lower mold 2, and simultaneously inserts the four insert rods 4 into the four insertion holes 6 on the four mating blocks 5 via the four support arms 3. Then, the handwheel 10 drives the transmission component to rotate. When the transmission component rotates, it drives the pushing strip 9 to extend into the opening 7, thereby smoothly pressing the insert rods 4 downward through the roller 8. When the four insert rods 4 move downward, the four support arms 3 drive the upper mold 1 to press tightly against the upper part of the lower mold 2, avoiding any gaps between the upper mold 1 and the lower mold 2 that could cause loosening. This connection method of the sand mold can avoid gaps between the upper and lower molds, thus preventing loosening and ensuring the molding quality of the product.

[0021] The transmission assembly includes a shaft 12, which is fixedly installed on one side of the handwheel 10. Two bushings 13 are rotatably mounted on the surface of the shaft 12. Both bushings 13 are fixedly connected to the bottom of the lower mold 2 via a fixing rod 14. A driving bevel gear 15 is fixedly mounted on one end of the shaft 12. A driven bevel gear 16 is meshed on one side of the surface of the driving bevel gear 15. A rotating shaft 17 is fixedly mounted in the middle of the driven bevel gear 16. The surface of the rotating shaft 17 is rotatably connected to the bottom of the lower mold 2 via two bearings 18. Threaded rods 19 are fixedly mounted on both ends of the rotating shaft 17. Positioning brackets 21 are rotatably mounted on the ends of the two threaded rods 19 that are far apart from each other via a bearing seat 20. The sides of the two positioning brackets 21 that are close to each other are fixedly connected to the lower mold 2.

[0022] The operator drives the shaft 12 to rotate inside the two bushings 13 via the handwheel 10. When the shaft 12 rotates, it drives the driven bevel gear 16 to rotate via the driving bevel gear 15. When the driven bevel gear 16 rotates, it drives the rotating shaft 17 to rotate inside the four bearings 18. When the rotating shaft 17 rotates, it drives the two threaded rods 19 to rotate along the two bearing seats 20 on the two positioning frames 21.

[0023] The surface of each threaded rod 19 is threaded with a threaded sleeve 22, and the threads of the two threaded rods 19 are opposite in direction. A support rod 23 is fixedly installed on the top of each threaded sleeve 22, and a connecting arm 24 is fixedly installed on the top of each support rod 23. The two ends of the two connecting arms 24, which are far apart from each other, are fixedly connected to four push bars 9 respectively. A slide rod 11 is movably inserted into both ends of the surface of the two connecting arms 24, and one end of the slide rod 11 is fixedly connected to the lower mold 2.

[0024] Since the threads of the two threaded rods 19 are opposite in direction, when the two threaded rods 19 rotate, they will drive the two threaded sleeves 22 to move in opposite directions. When the two threaded sleeves 22 move in opposite directions, they will drive the two connecting arms 24 to move in opposite directions through the two support rods 23. When the two connecting arms 24 move, they will slide along the surface of the slide rod 11, which will increase the stability of the two connecting arms 24 when they move in opposite directions. When the two connecting arms 24 move in opposite directions, they will extend into the opening 7 through the push bar 9, so that the insert rod 4 will be smoothly squeezed down through the roller 8. When the four insert rods 4 move down, they will drive the upper mold 1 to press against the upper part of the lower mold 2 through the four support arms 3, so as to avoid the gap between the upper mold 1 and the lower mold 2 and the loosening.

Claims

1. A sand casting base plate mold, comprising an upper mold (1), characterized in that: The lower part of the upper mold (1) is provided with a lower mold (2). Two support arms (3) are fixedly installed on both sides of the upper mold (1). Insert rods (4) are fixedly installed at the bottom of the four support arms (3). Two docking blocks (5) are fixedly installed on the upper part of both sides of the lower mold (2). Insert holes (6) are opened on the four docking blocks (5). The four insert rods (4) are inserted into the four insert holes (6). The lower part of the four insert rods (4) is opened with an opening (7). Rollers (8) are rotatably installed in the lower part of the four openings (7). Two pushing strips (9) are respectively provided on the lower part of both sides of the lower mold (2). A handwheel (10) is provided at the lower part of the front of the lower mold (2). A transmission component is provided on one side of the handwheel (10). The transmission component is connected to the four pushing strips (9). When the handwheel (10) rotates, the power is output to the four pushing strips (9) through the transmission component, so that the four pushing strips (9) push the four rollers (8) down.

2. The sand casting base plate mold according to claim 1, characterized in that: The transmission assembly includes a shaft (12), which is fixedly installed on one side of the handwheel (10). Two bushings (13) are rotatably installed on the surface of the shaft (12). Both bushings (13) are fixedly connected to the bottom of the lower mold (2) through a fixing rod (14). A drive bevel gear (15) is fixedly installed at one end of the shaft (12), and a driven bevel gear (16) is meshed on one side of the surface of the drive bevel gear (15).

3. The sand casting base plate mold according to claim 2, characterized in that: A rotating shaft (17) is fixedly installed in the middle of the driven bevel gear (16). The surface of the rotating shaft (17) is rotatably connected to the bottom of the lower mold (2) through two bearings (18). Threaded rods (19) are fixedly installed at both ends of the rotating shaft (17). Positioning brackets (21) are rotatably installed at the ends of the two threaded rods (19) that are far apart from each other through a bearing seat (20). The sides of the two positioning brackets (21) that are close to each other are fixedly connected to the lower mold (2).

4. The sand casting base plate mold according to claim 3, characterized in that: The threaded rods (19) are all threaded with threaded sleeves (22), and the threads of the two threaded rods (19) are opposite. The top of the threaded sleeves (22) is fixedly installed with support rods (23), and the top of the support rods (23) is fixedly installed with connecting arms (24). The two ends of the two connecting arms (24) on the opposite side are fixedly connected to four push bars (9). The two ends of the surfaces of the two connecting arms (24) are movably inserted with slide rods (11), and one end of the slide rods (11) is fixedly connected to the lower mold (2).

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