Casting mold for valve casing of exhaust valve of marine diesel engine

Abstract

The invention relates to the field of casting, in particular to a casting mold for a valve casing of an exhaust valve of a marine diesel engine, which comprises a platform I and a platform II which are arranged on a bottom frame, sand boxes are rotatably arranged on the platform I and the platform II, the sand box positioned on the platform II can be overturned to be right above the other sand box to complete box closing, and a sand filling mechanism is slidably arranged on the bottom frame. A pressing mechanism for pressing the sand mold is arranged above the bottom frame; turnover shafts are arranged on the side face of the sand box, worms are rotationally arranged on the side face of the platform I and the side face of the platform II, and the two worms are in meshed transmission connection with worm wheels at the ends of the two turnover shafts respectively. Manual operation in the production process can be reduced, the production efficiency is improved, stable product quality is guaranteed, and the labor cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of casting, and in particular to a casting mold for a marine diesel engine exhaust valve housing. Background Technology

[0002] Marine diesel engine exhaust valve bodies are typically made of cast iron and have an internal exhaust passage. The outer cavity of the passage contains a cooling water circulation chamber to cool the exhaust valve. Marine diesel engine exhaust valve bodies are generally cast using a casting mold made of cast steel and furan resin self-hardening sand. In traditional casting methods, sand filling, mold clamping, and mold assembly all rely on manual operation, resulting in low production efficiency, poor product quality stability, and high labor costs. Therefore, an intelligent casting mold is needed to reduce manual operations in the production process, improve production efficiency, ensure stable product quality, reduce labor costs, and promote the intelligent and efficient development of marine diesel engine exhaust valve body casting. Summary of the Invention

[0003] This invention proposes a casting mold for the exhaust valve housing of a marine diesel engine, which reduces manual operations in the production process, improves production efficiency, ensures stable product quality, and reduces labor costs.

[0004] The present invention adopts the following technical solution: A casting mold for a marine diesel engine exhaust valve housing includes platforms I and II mounted on a base frame. Sand boxes rotate on both platforms I and II, and the sand box on platform II can be flipped to be directly above the other sand box to complete the mold assembly. A sand-filling mechanism slides on the base frame, and a clamping mechanism for pressing the sand mold is located above the base frame. By automatically controlling the flipping of the two sand boxes, the automatic sand-filling mechanism, and the automatic clamping mechanism, manual operations in the production process are reduced, production efficiency is improved, product quality is ensured to be stable, and labor costs are reduced.

[0005] Preferably, the sand box is provided with a tilting shaft on its side, and both platform I and platform II have worm gears rotating on their sides. The two worm gears are respectively connected to the worm wheels at the ends of the two tilting shafts. Through the meshing between the worm gears and worm wheels, the tilting of the sand box can be controlled, and the self-locking function between the two can precisely control the position of the sand box, ensuring the stability of the box closing and improving the automation and intelligence of the sand box tilting.

[0006] Preferably, the sand filling mechanism includes a hopper with an inclined bottom plate and a sand filling port at the lower end of the bottom plate. A blocking plate is slidably positioned on the lower end face of the bottom plate. A control screw is rotatably mounted on the bottom plate and threadedly connected to the blocking plate. Through the threaded engagement between the control screw and the blocking plate, the blocking plate moves along the control screw, thereby opening the sand filling port and allowing sand to be discharged from it, thus automatically filling the sand hopper. Simultaneously, the size of the sand filling port opening can be controlled, thus controlling the sand filling flow rate. Furthermore, by installing a motor on the bottom plate of the hopper to drive the control screw, the automation and intelligence of the casting mold can be improved.

[0007] Preferably, the lower ends of the material box are provided with support plates on both sides, and the lower ends of the two support plates are limited by sliding rails, and the two rails are respectively fixed on both sides of the base frame.

[0008] Preferably, a drive shaft rotates between the two support plates, and the drive shaft is meshed with two track bars for transmission. Through the meshing connection between the drive shaft and the two track bars, the material box can move above the base frame, thereby adjusting the position of the sand filling port at the lower end of the material box. This allows the sand to be spread evenly inside the sand box when filling it, thus improving the efficiency of layered sand filling.

[0009] Preferably, a stirring frame rotates inside the material box above the sand filling port. This stirs the sand in the material box, ensuring its fluidity and allowing it to flow out through the sand filling port.

[0010] Preferably, the clamping mechanism includes a gantry frame, a power telescopic rod is installed at the middle of the upper end of the gantry frame, a horizontal rail plate is fixed at the free end of the power telescopic rod, a pressure block is installed at the lower end of the horizontal rail plate, and a plurality of air jet holes are provided at the lower end of the pressure block.

[0011] Preferably, the base frame has two threaded rails that rotate in the same direction, and the lower end of the portal frame is threadedly connected to the two threaded rails.

[0012] Preferably, the portal frame has a transversely rotating horizontal screw, and a threaded block is threadedly connected to the horizontal screw, with the threaded block sliding within the pressure block. Through the cooperation of the power telescopic rod, the horizontal screw, and the threaded rail, the pressure block can move to any position above platform I and platform II, thereby ensuring that the pressure block quickly compacts the molding sand in the sand box, automatically and rapidly compacting the molding sand; further enhancing the automation and intelligence of the casting mold.

[0013] Preferably, platform I has a drain hole near the end of platform II, and a support plate slides within the drain hole to support and block the lower end of the sand box. A hinged screw rotates at the lower end of the base frame and is threadedly connected to the support plate. The support plate slides out of the drain hole along the hinged screw, causing the lower end of the sand box to lose its support. At this point, the pressure block descends, pushing the molding sand in the sand box downwards, thus allowing the molding sand to encase the casting and slide out through the drain hole, facilitating the repetition of the above operation with the casting mold.

[0014] The beneficial effects of this invention are as follows: 1. The meshing between the worm and the worm wheel can control the flipping of the sand box, and the self-locking function between the two can precisely control the position of the sand box, ensuring the stability of the sand box closing and improving the automation and intelligence of the sand box flipping. 2. By moving the material box above the base frame, the position of the sand filling port at the lower end of the material box can be adjusted, so that when filling the sand box, the sand can be spread evenly in the sand box, thereby improving the efficiency of layered sand filling and improving the automation and intelligence of the casting mold. 3. Through the cooperation of the power telescopic rod, horizontal screw rod and threaded rail rod, the pressure block can move at any position above platform I and platform II, thereby ensuring that the pressure block quickly compacts the molding sand in the sand box and automatically compacts the molding sand quickly; further improving the automation and intelligence of the casting mold. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a casting mold for filling sand into the valve body of a marine diesel engine exhaust valve; Figure 2 This is a cross-sectional structural schematic diagram of a casting mold for a marine diesel engine exhaust valve housing; Figure 3 This is a schematic diagram of the structure of a casting mold for a marine diesel engine exhaust valve housing when the mold is assembled. Figure 4 and Figure 5 This is a structural diagram of the base frame, platform I, and platform II; Figure 6 This is a structural diagram of the sandbox; Figure 7 This is a schematic diagram of the sand filling mechanism; Figure 8 This is a schematic diagram of the clamping mechanism.

[0016] In the picture: 1. Base frame; 2. Platform I; 3. Platform II; 4. Track bar; 5. Support plate; 6. Threaded rail; 7. Opening and closing screw; 8. Sand box; 9. Tilting shaft; 11. Support plate; 12. Power shaft; 13. Sand filling port; 14. Blocking plate; 15. Control screw; 16. Gantry frame; 17. Horizontal screw; 18. Power telescopic rod; 19. Horizontal rail plate; 20. Pressure block; 21. Threaded block; 22. Mixing rack. Detailed Implementation

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0018] Reference Figure 1-8 A casting mold for the exhaust valve housing of a marine diesel engine includes a platform I2 and a platform II3 set on a base frame 1. A sand box 8 is rotated on both platforms I2 and platform II3, and the sand box 8 located on platform II3 can be flipped to be directly above the other sand box 8 to complete the mold closing. A sand filling mechanism slides on the base frame 1, and a clamping mechanism for clamping the sand mold is provided above the base frame 1. During sand filling, first control the two sand boxes 8 to rotate away from each other on platforms I2 and II3 respectively, until both sand boxes 8 are in a water state and located on platforms I2 and II3 respectively. Then, seal the lower port of the sand box 8 on platform I2. Next, place the lower pattern into the sand box 8 on platform I2, and fill the sand box 8 in layers using the sand filling mechanism. At the same time, use the clamping mechanism to compact the sand mold in the sand box 8 and control the hardness of the sand mold. Then, control the sand box 8 on platform II3 to rotate above the other sand box 8, and then place the upper pattern into the sand box 8 located above it, and fill the sand box 8 using the sand filling mechanism. Sand is layered and filled into the sand box 8. At the same time, the sand mold inside the sand box 8 is compacted by the clamping mechanism to control the hardness of the sand mold. After venting holes and pouring cups are made on the sand mold, the upper sand box 8 is controlled to flip over for demolding and cavity coating. After cleaning and inspection, the upper sand box 8 is controlled to rotate again to be directly above the other sand box 8 to complete the mold closing. Thus, by automatically controlling the flipping of the two sand boxes 8, the automatic sand filling mechanism, and the automatic clamping mechanism to compact the sand mold, manual operation in the production process is reduced, production efficiency is improved, product quality is ensured to be stable, and labor costs are reduced.

[0019] Reference Figure 6 The sand box 8 is provided with a flipping shaft 9 on its side, and worm gears 10 are rotatably provided on the sides of both platform I2 and platform II3. The two worm gears 10 are respectively meshed with the worm wheels at the ends of the two flipping shafts 9 for transmission.

[0020] Rotating the worm gear 10 can engage the transmission worm wheel to drive the flipping shaft 9 to rotate on platform I2 or platform II3, thereby flipping the sand box 8. The self-locking function between the worm gear 10 and the worm wheel can precisely control the position of the sand box 8 to ensure the stability of the box closing. Moreover, by installing motors on platform I2 and platform II3 to drive the worm gear 10, the automation and intelligence of the flipping of the sand box 8 can be improved.

[0021] Based on the above examples, refer to Figure 7The sand filling mechanism includes a material box 9, the bottom plate of the material box 9 is inclined, and a sand filling port 13 is provided at the lower end of the bottom plate of the material box 9. A blocking plate 14 is slidably limited on the lower end face of the bottom plate of the material box 9. A control screw 15 is rotatably mounted on the bottom plate of the material box 9, and the control screw 15 is threadedly connected to the blocking plate 14.

[0022] The material bin 9 is used to hold sand, and the sand is guided by the inclined bottom plate below it, so that the sand gathers at the sand filling port 13 at the lower end of the bottom plate of the material bin 9. By rotating the control screw 15, the threaded engagement between the control screw 15 and the blocking plate 14 allows the blocking plate 14 to move along the control screw 15, thereby opening the sand filling port 13 and allowing the sand to be discharged from the sand filling port 13, forming an automatic sand filling of the sand box 8. At the same time, the size of the opening of the sand filling port 13 can be controlled to control the sand filling flow rate. Moreover, by installing a motor on the bottom plate of the material bin 9 to drive the control screw 15, the automation and intelligence of the casting mold can be improved.

[0023] Furthermore, the lower ends of the material box 9 are provided with support plates 11 on both sides, and the lower ends of the two support plates 11 are limited to sliding rails 4, and the two rails 4 are respectively fixed on both sides of the base frame 1.

[0024] A power shaft 12 rotates between the two support plates 11, and the power shaft 12 is connected to the two track bars 4 through a transmission.

[0025] The motor mounted on the support plate 11 drives the power shaft 12. Through the meshing connection between the power shaft 12 and the two track bars 4, the power shaft 12 moves along the two track bars 4, which in turn drives the two support plates 11 to slide on the two track bars 4, allowing the material box 9 to move above the base frame 1. This adjusts the position of the sand filling port 13 at the lower end of the material box 9, so that when filling sand into the sand box 8, the sand is spread evenly inside the sand box 8, thereby improving the efficiency of layered sand filling.

[0026] Furthermore, a mixing rack 22 rotates inside the material box 9 above the sand filling port 13.

[0027] The mixing frame 22 is driven by a motor installed on the side of the material box 9, so that the mixing frame 22 rotates inside the material box 9, thereby mixing the sand in the material box 9, ensuring the fluidity of the sand in the material box 9, and ensuring that the sand can flow out through the sand filling port 13.

[0028] Based on the above examples, refer to Figure 8 The pressing mechanism includes a gantry frame 16, a power telescopic rod 18 is installed at the middle of the upper end of the gantry frame 16, a horizontal rail plate 19 is fixed at the free end of the power telescopic rod 18, a pressure block 20 is installed at the lower end of the horizontal rail plate 19, and a plurality of air jet holes are provided at the lower end of the pressure block 20.

[0029] The base frame 1 has two threaded rails 6 that rotate clockwise, and the lower end of the portal frame 16 is threadedly connected to the two threaded rails 6.

[0030] A transverse screw 17 rotates laterally on the gantry frame 16, and a threaded block 21 is threadedly connected to the transverse screw 17. The threaded block 21 slides within the pressure block 20.

[0031] The pressure block 20 has an internal air passage, so that after the connecting pipe on the side of the pressure block 20 is connected to the air supply system, high-pressure gas can be controlled to be ejected from multiple air jet holes at the bottom, and the molding sand in the sand box is quickly compacted by the impact of instantaneous high-pressure airflow. By controlling the extension and retraction of the power telescopic rod 18, the horizontal rail plate 19 can be raised and lowered on the portal frame 16, which in turn drives the pressure block 20 to rise and fall. By controlling the rotation of the two threaded rail rods 6, the portal frame 16 can be moved along the two threaded rail rods 6 through the threaded engagement between the threaded rail rods 6 and the portal frame 16, forming the forward movement of the pressure block 20. By controlling the rotation of the horizontal screw rod 17, the threaded block 21 can be moved along the horizontal screw rod 17 through the threaded engagement between the horizontal screw rod 17 and the threaded block 21, which in turn drives the lateral movement of the pressure block 20, thus forming the movement of the pressure block 20 at any position above platform I2 and platform II3, thereby ensuring that the pressure block 20 quickly compacts the molding sand in the sand box 8, automatically compacting the molding sand quickly. Moreover, by installing motors on the base frame 1 and the portal frame 16 to synchronously drive the horizontal screw rod 17 or the two threaded rail rods 6, the automation and intelligence of the casting mold are further improved. It should be noted that the pressure block 20 is provided with a vertical through hole, and the threaded block 21 slides in the through hole, thereby ensuring that the horizontal screw 17 will not interfere with the lifting and lowering movement of the pressure block 20 when the power telescopic rod 18 extends and retracts. Moreover, the upper end of the pressure block 20 slides in a limiting fit with the horizontal rail plate 19, ensuring that the horizontal screw 17 can control the lateral movement of the pressure block 20 on the horizontal rail plate 19.

[0032] Furthermore, the platform I2 is provided with a drain hole near the end of the platform II3, and a support plate 5 slides in the drain hole to support and block the lower end of the box. The lower end of the base frame 1 is provided with an opening and closing screw 7, which is threadedly connected to the support plate 5.

[0033] After the pouring is completed, rotate the opening and closing screw 7. Through the threaded engagement between the opening and closing screw 7 and the support plate 5, the support plate 5 slides out of the vent along the opening and closing screw 7, so that the lower end of the sand box 8 loses the support of the support plate 5. At this time, control the pressure block 20 to descend, push the molding sand in the sand box 8 downward, so that the molding sand wraps the casting and slides out of the vent, making it easy for the casting mold to repeat the above operation.

[0034] It should be noted that, based on the above embodiments, a sand mold hardness tester, temperature and humidity sensor, pressure sensor, and visual inspection device can also be installed on the casting mold to collect parameters such as sand mixing parameters, sand mold hardness, mold closing gap, and cavity status parameters, thereby further improving the automation and intelligence of the casting mold, reducing manual operation in the production process, improving production efficiency, ensuring stable product quality, and reducing labor costs.

[0035] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A casting mold for a marine diesel engine exhaust valve housing, characterized in that, It includes platforms I (2) and II (3) set on the base frame (1). Sand boxes (8) rotate on both platforms I (2) and II (3). The sand box (8) on platform II (3) can be flipped to be directly above another sand box (8) to complete the box closing. A sand filling mechanism slides on the base frame (1). A pressing mechanism for pressing the sand mold is provided above the base frame (1).

2. The casting mold according to claim 1, characterized in that, The sand box (8) is provided with a flip shaft (9) on its side. Both platform I (2) and platform II (3) are provided with worm gears (10) that rotate on their sides. The two worm gears (10) are respectively connected to the worm wheels at the ends of the two flip shafts (9) for transmission.

3. The casting mold according to claim 1, characterized in that, The sand filling mechanism includes a material box (9), the bottom plate of the material box (9) is inclined, and a sand filling port (13) is provided at the lower end of the bottom plate of the material box (9). A blocking plate (14) is slidably limited on the lower end face of the bottom plate of the material box (9). A control screw (15) is rotatably mounted on the bottom plate of the material box (9), and the control screw (15) is threadedly connected to the blocking plate (14).

4. The casting mold according to claim 3, characterized in that, The material box (9) is provided with support plates (11) on both sides of the lower end. The lower ends of the two support plates (11) are limited to sliding rails (4). The two rails (4) are fixed on both sides of the base frame (1).

5. The casting mold according to claim 4, characterized in that, A power shaft (12) rotates between the two support plates (11), and the power shaft (12) is connected to the two track bars (4) for transmission.

6. The casting mold according to claim 3, characterized in that, A mixing rack (22) rotates inside the material box (9) above the sand filling port (13).

7. The casting mold according to claim 1, characterized in that, The pressing mechanism includes a gantry frame (16), a power telescopic rod (18) is installed at the middle of the upper end of the gantry frame (16), a horizontal rail plate (19) is fixed at the free end of the power telescopic rod (18), a pressure block (20) is installed at the lower end of the horizontal rail plate (19), and multiple air jet holes are provided at the lower end of the pressure block (20).

8. The casting mold according to claim 7, characterized in that, The base frame (1) has two threaded rails (6) that rotate in the same direction, and the lower end of the portal frame (16) is threadedly connected to the two threaded rails (6).

9. The casting mold according to claim 7, characterized in that, The portal frame (16) has a transverse screw (17) that rotates laterally. A threaded block (21) is threaded through the transverse screw (17) and slides within the pressure block (20).

10. The casting mold according to claim 7, characterized in that, Platform I (2) has a drain hole near the end of platform II (3). A support plate (5) slides in the drain hole to support and block the lower end of the box. The lower end of the base frame (1) has an opening and closing screw (7) that rotates and is threadedly connected to the support plate (5).

Images