A ductile cast iron casting device

Abstract

The application discloses a nodular cast iron casting device and relates to the technical field of casting, which comprises a centrifugal casting mechanism, a material uniformizing mechanism and a liquid injection mechanism. The centrifugal casting mechanism comprises a mold cylinder and a centrifugal driving assembly. The output end of the centrifugal driving assembly is in transmission connection with the mold cylinder. The centrifugal driving assembly is used for driving the horizontally arranged mold cylinder to rotate. The material uniformizing mechanism comprises a material uniformizing cylinder and a material uniformizing driving assembly. The output end of the material uniformizing driving assembly is in transmission connection with the material uniformizing cylinder. The material uniformizing driving assembly is used for driving the material uniformizing cylinder to rotate. A plurality of material uniformizing holes are formed in the cylinder wall of the material uniformizing cylinder. In a liquid injection state, the material uniformizing cylinder is located in the mold cylinder and coaxially arranged with the mold cylinder. The rotating direction of the material uniformizing cylinder is the same as that of the mold cylinder. The rotating speed of the material uniformizing cylinder is greater than that of the mold cylinder. The liquid injection mechanism is arranged in the material uniformizing cylinder. The liquid injection mechanism is used for delivering molten liquid into the material uniformizing cylinder. The casting device can realize uniform spraying of metal liquid and reduce wall thickness deviation.

Description

Technical Field

[0001] This invention belongs to the field of casting technology, and specifically relates to a casting device for ductile iron castings. Background Technology

[0002] In the field of modern industrial manufacturing, ductile iron is widely used in key industries such as automobile manufacturing, machinery and equipment, energy and power, and rail transportation due to its excellent mechanical properties, such as high strength, high toughness, good wear resistance and fatigue resistance.

[0003] Ductile iron casting processes include resin sand casting, wet foam sand casting, centrifugal casting, and lost foam casting. Each process must ensure the spheroidization rate, microstructure, and mechanical properties of the ductile iron. For example, resin sand casting involves pouring molten metal into a mold cavity that conforms to the shape of the part, and then allowing it to cool to obtain the part or blank. For tubular castings, centrifugal casting is currently the primary method, suitable for large-batch production of castings with little or no machining.

[0004] However, existing centrifugal casting devices directly inject molten metal into the high-speed rotating mold cavity from one side during casting. This causes the molten metal to first accumulate at the injection point and then diffuse outwards under centrifugal force. During the diffusion process, inertial accumulation (in the centrifugal casting environment, "inertial accumulation" refers to the local accumulation of molten metal during diffusion within the mold due to the combined effect of the initial momentum of the molten metal injected from one side and the centrifugal force of the rotating mold) can lead to uneven thickness of the molten metal in the circumferential direction of the mold. Ultimately, this results in wall thickness deviations in the casting, affecting dimensional accuracy and structural stability. Summary of the Invention

[0005] The purpose of this invention is to provide a simple and reasonably designed ductile iron casting device to solve the above-mentioned problems.

[0006] The present invention achieves the above objectives through the following technical solutions:

[0007] A casting apparatus for ductile iron castings, comprising:

[0008] A centrifugal casting mechanism includes a mold cylinder and a centrifugal drive assembly. The output end of the centrifugal drive assembly is connected to the mold cylinder for transmission. The centrifugal drive assembly is used to drive the mold cylinder to rotate. The cylinder axis of the mold cylinder is set horizontally.

[0009] The uniform material mechanism comprises a uniform material cylinder and a uniform material driving assembly, the output end of the uniform material driving assembly is in transmission connection with the uniform material cylinder, the uniform material driving assembly is used for driving the uniform material cylinder to rotate, a plurality of uniform material holes are formed in the cylinder wall of the uniform material cylinder, and in the liquid injection state, the uniform material cylinder is located in the mold cylinder and is coaxially arranged with the mold cylinder, wherein the rotating direction of the uniform material cylinder is the same as the rotating direction of the mold cylinder, and under the driving of the uniform material driving assembly, the rotating speed of the uniform material cylinder is greater than the rotating speed of the mold cylinder.

[0010] The liquid injection mechanism is arranged in the uniform material cylinder, and the liquid injection mechanism is used for conveying the molten liquid into the uniform material cylinder.

[0011] As a further optimization scheme of the application, the centrifugal driving assembly comprises a first driving gear, a first driven gear, a first motor, a supporting wheel and a limiting roller, the output end of the first motor is in transmission connection with the first driving gear, the first driving gear is in meshing transmission with the first driven gear, and the first driven gear is fixedly arranged on the outer periphery of the mold cylinder; the outer periphery of the mold cylinder is also fixedly provided with the supporting wheel, and the supporting wheel is in rolling connection with the limiting roller.

[0012] As a further optimization scheme of the application, the uniform material driving assembly comprises a second motor, a second driving gear and a second driven gear, the output end of the second motor is in transmission connection with the second driving gear, the second driving gear is in meshing transmission with the second driven gear, and the second driven gear is fixedly arranged on the uniform material cylinder; the uniform material cylinder is arranged on the second sliding seat.

[0013] As a further optimization scheme of the application, the liquid injection mechanism comprises a liquid injection pipe, the liquid injection pipe extends into the uniform material cylinder, a liquid injection port is formed in the side of the liquid injection pipe, and a sealing assembly is arranged on one side of the liquid injection port; the sealing assembly is used for sealing the liquid injection port after the liquid injection is completed.

[0014] As a further optimization scheme of the application, the sealing assembly comprises a sealing driving assembly, a sealing plate, a clamping plate and a side baffle, the output end of the sealing driving assembly is in transmission connection with the sealing plate, the sealing plates are arranged in pairs, and along the axis direction of the liquid injection pipe, the sealing plates arranged in pairs are symmetrically arranged on the two sides of the liquid injection port; along the axis direction of the liquid injection pipe, the two ends of the liquid injection port are respectively fixedly connected with the side baffles, the two ends of the sealing plate are respectively fixedly provided with the clamping plates, the clamping grooves are formed in the clamping plates, and the clamping grooves are correspondingly arranged with the side baffles.

[0015] When the sealing plate is located at the initial position, the liquid injection port is opened, and the clamping plate is arranged in a spaced manner with the side baffle; when the sealing plate is located at the sealing position, the clamping plate is sealed and abuts against the side baffle through the clamping groove, and the accommodation area is formed between the side baffle and the sealing plate.

[0016] As a further optimization scheme of the present application, the sealing drive assembly comprises a third motor, a third driving gear, a third driven gear and a main shaft, the output end of the third motor is drivingly connected with the third driving gear, the third driven gears are arranged in pairs, the third driven gears arranged in pairs are in mesh with each other, and the third driving gear is in mesh transmission with one of the third driven gears, the third driven gears are fixedly arranged on the corresponding main shaft, the swing arm is fixedly connected with the main shaft, and the end of the swing arm away from the main shaft is fixedly connected with the sealing plate.

[0017] As a further optimization scheme of the present application, the sealing plate is embedded with a heating element, the heating element is used for heating and keeping warm the metal solution in the accommodation area, and the heating element is electrically connected with the temperature control element.

[0018] As a further optimization scheme of the present application, the limiting roller and the first motor are respectively arranged on the first sliding seat, the second motor and the second driving gear are arranged on the second sliding seat, the first sliding seat is arranged on the output end of the first linear displacement mechanism, the first linear displacement mechanism is used for driving the first sliding seat to reciprocate along the axis direction of the material uniformizing cylinder, and the second sliding seat is arranged on the output end of the second linear displacement mechanism, and the second linear displacement mechanism is used for driving the second sliding seat to reciprocate along the axis direction of the mold cylinder.

[0019] The inside of the mold cylinder is further provided with a material pulling plate, the circumferential side wall of the material pulling plate is attached to the circumferential inner wall of the mold cylinder, the side of the material pulling plate away from the feeding end of the mold cylinder is provided with a limiting block, the limiting block is in clamping cooperation with the bottom end of the mold cylinder, the inside of the material pulling plate is slidably installed with a guide rod, the outer end of the guide rod is fixedly connected with a pressing block, the inner end of the guide rod is fixedly connected with a locking rod, one end of the guide rod close to the locking rod is sleeved with a spring, the locking rod has a locking tooth at the outer position of the material pulling plate, and the shaft end of the material uniformizing cylinder is provided with a locking groove, and the locking tooth is connected with the material uniformizing cylinder through the locking groove.

[0020] The lower part of the mold cylinder is provided with a lifting assembly, when the first linear displacement mechanism drives the first sliding seat to move the mold cylinder to the unloading position away from the material uniformizing cylinder, the lifting part of the lifting assembly holds the centrifugal casting formed pipe; and under the driving of the driving part of the lifting assembly, the lifting part holds the pipe to move downward to press the pipe against the pressing block, and the locking tooth exits the locking groove.

[0021] As a further optimization scheme of the present application, the first linear displacement mechanism comprises a fourth motor, a first sliding rail, a first screw rod and a first sliding block, the output end of the fourth motor is drivingly connected with the first screw rod, the two ends of the first screw rod are rotatably connected on the first sliding rail, the first sliding block is threadedly connected on the first screw rod, and the first sliding block is slidingly connected with the first sliding rail, the first sliding seat is fixedly arranged on the first sliding block, the second linear displacement mechanism comprises a fifth motor, a second sliding rail, a second screw rod and a second sliding block, the output end of the fifth motor is drivingly connected with the second screw rod, the two ends of the second screw rod are rotatably connected on the second sliding rail, the second sliding block is threadedly connected on the second screw rod, and the second sliding block is slidingly connected with the second sliding rail, and the second sliding seat is fixedly arranged on the second sliding block.

[0022] As a further optimization scheme of the present application, the end plate is fixedly arranged on the material uniformizing cylinder, and when the material uniformizing cylinder is located at the material uniformizing position, the end plate frictionally abuts against the feeding end of the mold cylinder.

[0023] The present application has at least the following advantages: The ductile iron casting device provided by the present application comprises a centrifugal casting mechanism, a material uniformizing mechanism and a liquid injection mechanism, the centrifugal casting mechanism comprises a mold cylinder and a centrifugal driving assembly, the material uniformizing mechanism comprises a material uniformizing cylinder and a material uniformizing driving assembly, the material uniformizing cylinder is arranged in the mold cylinder, and the material uniformizing cylinder is controlled to rotate in the same direction as the mold cylinder, so that the metal liquid injected into the material uniformizing cylinder by the liquid injection mechanism is dispersed circumferentially through the material uniformizing holes of the material uniformizing cylinder first, and the metal liquid thrown onto the mold cylinder has an initial linear velocity, can overcome the surface tension and viscous resistance more quickly, spread along the inner surface of the mold cylinder, so that the metal liquid can cover the inner surface of the mold cylinder more uniformly, and the rotation speed of the material uniformizing cylinder is greater than that of the mold cylinder, so that the dispersed liquid with high initial speed can flow along the rotation direction of the mold cylinder more efficiently, and the relative speed difference with the inner wall of the mold cylinder is smaller (same direction movement), the impact and splashing are reduced, the local missing or oxidation on the mold cylinder caused by the splashing of the metal liquid is avoided, and the wall thickness deviation is reduced sufficiently.

[0024] Moreover, the sealing assembly is arranged near the liquid injection opening of the liquid injection pipe, the sealing assembly comprises a sealing driving assembly, a sealing plate, a clamping plate and a side baffle, when the liquid injection is finished, the residual metal liquid near the liquid injection opening in the liquid injection pipe will gather to the liquid injection opening, therefore, the sealing plate is driven by the sealing driving assembly to swing to a sealing position, a storage area composed of the sealing plate and the side baffle is formed below the liquid injection opening, the residual metal liquid is temporarily stored, and the metal liquid is prevented from dropping onto the surface of the pipe part which has been centrifugally cast, so that the local wall thickness is increased.

[0025] In addition, the metal liquid received in the receiving area is always kept in a molten state under the heat preservation of the heating element in the sealing plate, and after the sealing plate returns to the initial position when the next pipe is subjected to centrifugal casting, the received metal liquid can continue to be used as the raw material of the casting, saving resources and avoiding the blockage problem caused by the exposure of the pouring port in the traditional way. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a schematic diagram of the overall structure of the present application;

[0027] Figure 2 is a schematic diagram of the overall structure of the present application Figure 1 is a schematic diagram of the front structure of the present application;

[0028] Figure 3 is a schematic diagram of the partial cross-sectional structure of the mold cylinder, the material uniformizing mechanism and the liquid injection pipe of the present application;

[0029] Figure 4 is an enlarged view of A in the present application Figure 3 ;

[0030] Figure 5 is an enlarged view of B in the present application Figure 3 ;

[0031] Figure 6 is a schematic diagram of the partial structure of the liquid injection pipe and the sealing assembly of the present application;

[0032] Figure 7 is an enlarged view of C in the present application Figure 6 ;

[0033] Figure 8 is a schematic diagram of the partial cross-sectional structure of the liquid injection pipe and the sealing assembly of the present application along the radial direction of the liquid injection pipe;

[0034] Figure 9 is a schematic diagram of the front structure of the overall structure of the present application when the pipe is taken out;

[0035] Figure 10 is a schematic diagram of the structure of the mold cylinder and the centrifugal driving assembly of the present application;

[0036] Figure 11 is a schematic diagram of the structure of the first linear displacement mechanism and the second linear displacement mechanism of the present application.

[0037] As shown in the figure: 1, the mold cylinder; 11, the first driven gear; 12, the first driving gear; 13, the first motor; 14, the limit gear; 15, the support wheel; 16, the limit roller; 2, the first linear displacement mechanism; 21, the fourth motor; 22, the first sliding rail; 23, the first screw; 24, the first sliding block; 25, the first sliding seat; 3, the material uniformizing mechanism; 31, the material uniformizing cylinder; 32, the second motor; 33, the second driving gear; 34, the second driven gear; 35, the end plate; 36, the material uniformizing hole; 37, the material pulling plate; 38, the limit block; 39, the pressing block; 310, the guide rod; 311, the spring; 312, the locking rod; 313, the locking gear; 314, the locking groove; 4, the liquid injection mechanism; 41, the rotating injection groove; 42, the liquid injection pipe; 421, the position giving groove; 422, the liquid injection port; 43, the third motor; 44, the third driving gear; 45, the third driven gear; 46, the main shaft; 47, the swing arm; 48, the sealing plate; 481, the heating piece; 482, the temperature control piece; 49, the side baffle; 410, the clamping plate; 411, the clamping groove; 5, the second linear displacement mechanism; 51, the fifth motor; 52, the second sliding rail; 53, the second screw; 54, the second sliding block; 55, the second sliding seat; 6, the lifting assembly. DETAILED DESCRIPTION

[0038] The application will be further described in details below with reference to the drawings, it is necessary to point out that the following detailed description is only used to further illustrate the application, and cannot be understood as limiting the protection scope of the application, the skilled in the art can make some non-essential improvements and adjustments to the application according to the above application content.

[0039] As shown in the figure, Figure 1 , Figure 2 and Figure 3 , the embodiment provides a ductile cast iron casting device, which comprises:

[0040] The centrifugal casting mechanism comprises a mold cylinder 1 and a centrifugal driving assembly, the output end of the centrifugal driving assembly is in transmission connection with the mold cylinder 1, and the centrifugal driving assembly is used for driving the mold cylinder 1 to rotate, wherein the cylinder axis of the mold cylinder 1 is horizontally arranged;

[0041] The material uniformizing mechanism 3 comprises a material uniformizing cylinder 31 and a material uniformizing driving assembly, the output end of the material uniformizing driving assembly is in transmission connection with the material uniformizing cylinder 31, and the material uniformizing driving assembly is used for driving the material uniformizing cylinder 31 to rotate, a plurality of material uniformizing holes 36 are formed in the cylinder wall of the material uniformizing cylinder 31, and in the liquid injection state, the material uniformizing cylinder 31 is located in the mold cylinder 1 and coaxially arranged with the mold cylinder 1, wherein the rotating direction of the material uniformizing cylinder 31 is the same as the rotating direction of the mold cylinder 1, and under the driving of the material uniformizing driving assembly, the rotating speed of the material uniformizing cylinder 31 is greater than the rotating speed of the mold cylinder 1;

[0042] The liquid injection mechanism 4 is arranged in the homogenizing cylinder 31, and is used to deliver the molten liquid into the homogenizing cylinder 31.

[0043] In the above embodiment, the liquid injection mechanism 4 delivers the molten metal liquid into the homogenizing cylinder 31, and the liquid is uniformly dispersed on the inner wall of the mold cylinder 1 by the rotation of the homogenizing cylinder 31 through the homogenizing holes 36. Compared with the traditional molten liquid column directly injected onto the inner wall of the mold cylinder 1 by relying on its own gravity, the dispersed metal liquid can more uniformly cover the inner surface of the mold cylinder 1, and the rotation speed of the homogenizing cylinder 31 is greater than the rotation speed of the mold cylinder 1, so that the metal liquid has a certain initial linear velocity when it is thrown by the homogenizing cylinder 31 onto the mold cylinder 1. When the metal liquid with high initial velocity contacts the inner wall of the mold cylinder 1, it can overcome the surface tension and viscous resistance more quickly, spread along the inner surface of the mold cylinder 1, and the rotation speed of the homogenizing cylinder 31 is greater than the rotation speed of the mold cylinder 1, so that the dispersed liquid with high initial velocity can flow more efficiently in the rotation direction of the mold cylinder 1, and the relative speed difference between the liquid and the inner wall of the mold cylinder 1 is smaller (moving in the same direction), reducing the impact and splashing, avoiding the local missing or oxidation of the mold cylinder 1 caused by the splashing of the metal liquid, and fully reducing the wall thickness deviation.

[0044] It should be noted that, continuing to refer to Figure 1 and Figure 10 , the centrifugal driving assembly includes a first driving gear 12, a first driven gear 11, a first motor 13, a supporting wheel 15 and a limiting roller 16, the output end of the first motor 13 is drivingly connected with the first driving gear 12, the first driving gear 12 is drivingly engaged with the first driven gear 11, and the first driven gear 11 is fixedly arranged on the outer periphery of the mold cylinder 1. The outer periphery of the mold cylinder 1 is also fixedly provided with the supporting wheel 15, and the supporting wheel 15 is rollingly connected with the limiting roller 16. The first motor 13 drives the first driving gear 12 to rotate by engaging the first driven gear 11, and finally realizes the rotation of the mold cylinder 1. In the rotation process, the supporting wheel 15 on the mold cylinder 1 is limited and constrained by the limiting roller 16, and the first driven gear 11 also drivingly engages with the limiting gear 14, thereby ensuring the stable rotation of the mold cylinder 1.

[0045] For example, continuing to refer to Figure 3 , the homogenizing driving assembly includes a second motor 32, a second driving gear 33 and a second driven gear 34, the output end of the second motor 32 is drivingly connected with the second driving gear 33, the second driving gear 33 is drivingly engaged with the second driven gear 34, and the second driven gear 34 is fixedly arranged on the homogenizing cylinder 31. The homogenizing cylinder 31 is rotatably arranged on the second sliding seat 55. By driving the second motor 32, the second driving gear 33 drivingly engages with the second driven gear 34 to realize the rotation of the homogenizing cylinder 31.

[0046] For example, continuing to refer to Figure 1 ,Figure 2 and Figure 6 The liquid injection mechanism 4 comprises a liquid injection pipe 42 extending into the homogenizing cylinder 31, and a liquid injection port 422 is formed on the side of the liquid injection pipe 42. A sealing assembly is arranged on one side of the liquid injection port 422 to seal the liquid injection port 422 when the liquid injection is completed.

[0047] It should be noted that the liquid injection pipe 42 is fixedly arranged on the second sliding seat 55, and the input end of the liquid injection pipe 42 is in communication with the rotating injection groove 41. When the liquid injection is performed, the required amount of metal liquid is first poured into the rotating injection groove 41. The liquid injection port 422 is provided with a plurality of ports which are uniformly distributed along the axis direction of the liquid injection pipe 42.

[0048] For example, referring to Figure 6 , Figure 7 and Figure 8 , the sealing assembly comprises a sealing driving assembly, a sealing plate 48, a clamping plate 410 and a side baffle 49. The output end of the sealing driving assembly is drivingly connected with the sealing plate 48. The sealing plate 48 is arranged in pairs and symmetrically arranged on both sides of the liquid injection port 422 along the axis direction of the liquid injection pipe 42. The two ends of the liquid injection port 422 are respectively fixedly connected with the side baffle 49 along the axis direction of the liquid injection pipe 42. The two ends of the sealing plate 48 are respectively fixedly provided with the clamping plate 410. The clamping plate 410 is provided with a clamping groove 411. The clamping groove 411 is correspondingly arranged with the side baffle 49.

[0049] When the sealing plate 48 is located at the initial position, as shown in Figure 6 and Figure 7 , the liquid injection port 422 is opened, and the clamping plate 410 is arranged in a spaced manner with the side baffle 49. When the sealing plate 48 is located at the sealing position, as shown in Figure 8 , the clamping plate 410 is sealingly abutted with the side baffle 49 through the clamping groove 411. The side baffle 49 and the sealing plate 48 form a receiving area.

[0050] By controlling the opening state of the liquid injection port 422 by the sealing plate 48, the liquid injection port 422 is closed by the sealing plate 48 when the liquid injection is completed, so as to prevent the metal solution possibly remaining in the liquid injection pipe 42 from dropping into the homogenizing cylinder 31 through the liquid injection port 422, as shown in Figure 8As shown, after the sealing plate 48 closes the liquid inlet 422, a receiving area is formed between the side baffle 49 and the sealing plate 48, that is, the residual metal solution is received in the receiving area under the aggregation of the liquid inlet 422, instead of being received in the liquid inlet 422. The sealing plate 48 arranged obliquely expands the receiving area below the liquid inlet 422 to increase the receiving space, so that when the casting is finished and the pouring pipe 42 is taken out of the homogenizing cylinder 31, the metal liquid dropped from the liquid inlet 422 will not drop to other working areas, and after cooling, a hard metal block is formed, which is not easy to clean and even scalds the workers. Moreover, when the next pipe is cast, the sealing plate 48 is opened, and the metal liquid collected in the receiving area can be continuously used, saving resources.

[0051] It should be noted that the amount of metal solution poured into the rotating pouring groove 41 includes the amount of residual metal solution in the pouring pipe 42, so as to ensure that the metal solution poured through the pouring pipe 42 meets the required solution amount for centrifugal casting of the pipe. Moreover, when the sealing plate 48 is in the sealing position, the end face of the sealing plate 48 facing the liquid inlet 422 is in sealing abutment with the edge of the liquid inlet 422, and the lower ends of the two sealing plates 48 are in sealing abutment with each other, thereby ensuring the sealing property of the receiving area.

[0052] For example, continuing to refer to Figure 5 、 Figure 6 and Figure 8 , the sealing drive assembly includes a third motor 43, a third driving gear 44, a third driven gear 45, and a main shaft 46. The output end of the third motor 43 is drivingly connected with the third driving gear 44. The third driven gears 45 are arranged in pairs and mesh with each other. One of the third driven gears 45 is drivingly meshed with the third driving gear 44. The third driven gears 45 are fixedly arranged on the corresponding main shafts 46. The main shafts 46 are fixedly connected with swing arms 47. The swing arms 47 are fixedly connected with the sealing plates 48 at the ends away from the main shafts 46. The third motor 43 and the third driving gear 44 are arranged on the second sliding seat 55.

[0053] For example, in the orientation shown in Figure 8 , under the driving of the third motor 43, the third driving gear 44 drivingly meshes with one of the third driven gears 45, so that the two third driven gears 45 mesh with each other and rotate in opposite directions, thereby realizing that the two main shafts 46 rotate in opposite directions. The main shafts 46 drive the corresponding sealing plates 48 through the swing arms 47 to realize synchronous rotation, so that the sealing plates 48 are switched between the initial position and the sealing position.

[0054] It should be noted that, considering the diameter size of the liquid injection pipe 42 and the size of the swing radius of the sealing plate 48, a clearance groove 421 can be formed on the circumferential side of the liquid injection port 422, so that the sealing plate 48 will not be interfered by the liquid injection pipe 42 when it swings.

[0055] As shown in Figure 5 and Figure 8 , the sealing plate 48 is embedded with a heating element 481, which is used to heat and keep warm the metal melt in the accommodation area, preventing the pipe from being blocked by the liquid injection port 422 during the solidification and forming process of the centrifugal casting pipe. The heating element 481 is electrically connected with a temperature control element 482, which is arranged on the second sliding seat 55, and is used to adjust the working temperature of the heating element 481.

[0056] For example, referring to Figure 10 , the limiting roller 16 and the first motor 13 are respectively arranged on the first sliding seat 25, referring to Figure 3 , the second motor 32 and the second driving gear 33 are arranged on the second sliding seat 55, referring to Figure 2 , the first sliding seat 25 is arranged on the output end of the first linear displacement mechanism 2, which is used to drive the first sliding seat 25 to reciprocate along the axis direction of the material uniformizing cylinder 31. The second sliding seat 55 is arranged on the output end of the second linear displacement mechanism 5, which is used to drive the second sliding seat 55 to reciprocate along the axis direction of the mold cylinder 1;

[0057] Referring to Figure 3 and Figure 4 , the inside of the mold cylinder 1 is further provided with a material pulling plate 37, and the circumferential side wall of the material pulling plate 37 is attached to the circumferential inner wall of the mold cylinder 1. The side of the material pulling plate 37 away from the feeding end of the mold cylinder 1 is provided with a limiting block 38, which is connected and matched with the bottom end of the mold cylinder 1 (such as the right end of the mold cylinder 1 shown in Figure 3 ). The inside of the material pulling plate 37 is slidably installed with a guide rod 310, the outer end of the guide rod 310 is fixedly connected with a pressing block 39, the inner end of the guide rod 310 is fixedly connected with a locking rod 312, and the end of the guide rod 310 close to the locking rod 312 is sleeved with a spring 311. The locking rod 312 has a locking tooth 313 at the outer position of the material pulling plate 37, and the shaft end of the material uniformizing cylinder 31 is provided with a locking groove 314, and the locking tooth 313 is connected with the material uniformizing cylinder 31 through the locking groove 314.

[0058] Among them, referring to Figure 9, the lower part of the mold cylinder 1 is provided with a lifting assembly 6, when the first linear displacement mechanism 2 drives the first sliding seat 25 to move the mold cylinder 1 to the unloading position away from the homogenizing cylinder 31, the lifting part of the lifting assembly 6 lifts the centrifugal casting formed pipe (the structure is shown by the dotted line) Figure 9 At this time, the pipe is completely separated from the mold cylinder 1; and under the driving of the driving part of the lifting assembly 6, the lifting part lifts the pipe to move downward to press the pipe against the pressing block 39, so that the lock tooth 313 exits the lock groove 314.

[0059] For example, the lifting part of the lifting assembly 6 is a V-shaped lifting seat, and the driving part of the lifting assembly 6 is a telescopic pneumatic cylinder, an electric pneumatic cylinder, a hydraulic pneumatic cylinder, etc., which is not limited here.

[0060] In the above embodiment, the mold cylinder 1 is driven by the limiting block 38 to rotate synchronously with the drawing plate 37, at this time, the lock tooth 313 rotates in the lock groove 314, and in this process, the metal casting is formed on the left side of the drawing plate 37 (for example, in the direction shown by the arrow) Figure 3 For example, in the direction shown by the arrow Figure 9 For the centrifugal casting pipe, when it is taken out, the first linear displacement mechanism 2 drives the first sliding seat 25 to move the mold cylinder 1 to the right, the homogenizing cylinder 31 pulls the drawing plate 37 through the lock tooth 313, so that the pipe is limited on the left side of the drawing plate 37, and the pipe is pulled out of the mold cylinder 1, and in the process of being pulled out, the pipe is gradually not supported by the mold cylinder 1, therefore, the lifting assembly 6 is needed to assist in supporting;

[0061] When the mold cylinder 1 moves to the right to the unloading position, the pipe is completely supported by the lifting assembly 6, at this time, the driving part of the lifting assembly 6 drives the lifting part to move downward, so that the pipe moves downward synchronously to the inner wall of the pipe to abut against the pressing block 39, the guide rod 310 drives the lock rod 312 to move downward, so that the lock tooth 313 exits the lock groove 314, at this time, under the driving of the second linear displacement mechanism 5, the second sliding seat 55 drives the homogenizing cylinder 31 and the liquid injection pipe 42 to move to the left to exit outside the pipe, while the drawing plate 37 still stays in the mold cylinder 1; then the pipe can be taken away by the mechanical hand, and the taking-away process is not interfered by the homogenizing cylinder 31 and the mold cylinder 1;

[0062] The inlet end of the lock groove 314 has a circular arc convex part, and the lock tooth 313 has an inclined surface, when the next pipe casting is performed, the mold cylinder 1 is only needed to be repositioned to the casting position, and then the homogenizing cylinder 31 is repositioned to the casting position, when the homogenizing cylinder 31 just extends into the mold cylinder 1, the circular arc convex part of the lock groove 314 extrudes the inclined surface of the lock tooth 313, so that the lock rod 312 moves downward, until the lock tooth 313 enters the lock groove 314, the homogenizing cylinder 31 continues to extend, and then the drawing plate 37 is pushed to the right to abut against the bottom end of the mold cylinder 1, at this time, the limiting block 38 on the drawing plate 37 is limited and clamped with the bottom end of the mold cylinder 1.

[0063] It should be noted that, as shown in Figure 3 The end plate 35 is fixedly arranged on the material uniformizing cylinder 31. When the material uniformizing cylinder 31 is located at the material uniformizing position, the end plate 35 frictionally abuts against the feeding end of the mold cylinder 1, thereby closing the feeding end of the mold cylinder 1 and preventing the metal from splashing out of the mold cylinder 1.

[0064] For example, continuing to refer to Figure 2 and Figure 11 The first linear displacement mechanism 2 comprises a fourth motor 21, a first sliding rail 22, a first screw rod 23 and a first sliding block 24. The output end of the fourth motor 21 is drivingly connected with the first screw rod 23, the two ends of the first screw rod 23 are rotationally connected with the first sliding rail 22, the first sliding block 24 is threadedly connected with the first screw rod 23, and the first sliding block 24 is slidingly connected with the first sliding rail 22. The first sliding seat 25 is fixedly arranged on the first sliding block 24. The second linear displacement mechanism 5 comprises a fifth motor 51, a second sliding rail 52, a second screw rod 53 and a second sliding block 54. The output end of the fifth motor 51 is drivingly connected with the second screw rod 53, the two ends of the second screw rod 53 are rotationally connected with the second sliding rail 52, and the second sliding block 54 is threadedly connected with the second screw rod 53. The second sliding block 54 is slidingly connected with the second sliding rail 52. The second sliding seat 55 is fixedly arranged on the second sliding block 54.

[0065] It should be noted that, when the ductile cast iron casting device is used, the lifting assembly 6 is located at the initial position. At this time, under the driving of the first linear displacement mechanism 2, the first sliding seat 25 drives the mold cylinder 1 to move left to the casting position. Then, under the driving of the second linear displacement mechanism 5, the second sliding seat 55 drives the material uniformizing cylinder 31 and the liquid injection pipe 42 to move right to the casting position. During the right movement of the material uniformizing cylinder 31, the arc convex part of the lock groove 314 first extrudes the inclined surface of the lock tooth 313, so that the lock rod 312 moves downward. When the lock tooth 313 enters the lock groove 314, the material uniformizing cylinder 31 continues to extend, and the material pulling plate 37 is pushed right to abut against the bottom end of the mold cylinder 1. At this time, the limiting block 38 on the material pulling plate 37 is limitedly connected with the bottom end of the mold cylinder 1, and the end plate 35 abuts against the end face of the feeding end of the mold cylinder 1.

[0066] The first motor 13 is started to drive the mold cylinder 1 to rotate, and the second motor 32 is started to drive the material uniformizing cylinder 31 to rotate. At this time, the rotation directions of the material uniformizing cylinder 31 and the mold cylinder 1 are the same, and the rotation speed of the material uniformizing cylinder 31 is greater than that of the mold cylinder 1. Then, the metal liquid is poured into the rotating injection groove 41. At this time, the sealing plates 48 on both sides of the liquid injection opening 422 are located at the initial position, i.e., the liquid injection opening 422 is in the open state. The metal liquid is injected into the material uniformizing cylinder 31 through the liquid injection pipe 42 and the liquid injection opening 422, and is uniformly sprayed on the inner wall of the mold cylinder 1 through the material uniformizing holes 36 on the material uniformizing cylinder 31.

[0067] After the injection of the metal solution required for the pipe casting is completed, the third motor 43 is driven, and the main shaft 46 drives the sealing plate 48 to swing through the swing arm 47 under the meshing transmission of the third driving gear 44 and the third driven gear 45, so that the pair of sealing plates 48 are close to each other, as shown in the figure, the sealing plate 48 drives the clamping plate 410 to make the clamping groove 411 clamped with the side baffle 49, so as to form a receiving area between the sealing plate 48 and the side baffle 49, so that the residual metal liquid in the liquid injection pipe 42 is gathered into the receiving area below the liquid injection port 422; Figure 8

[0068] After the casting is completed, the mold cylinder 1 and the material uniformizing cylinder 31 stop rotating, and the pressing block 39 is located at a position above the radial direction of the material pulling plate 37, at this time, the first linear displacement mechanism 2 drives the first sliding block 25 to move the mold cylinder 1 to the right, and the material uniformizing cylinder 31 pulls the material pulling plate 37 through the locking teeth 313, so that the pipe is limited on the left side of the material pulling plate 37, so that the pipe is pulled out of the mold cylinder 1, and in the process of being pulled out, the pipe is gradually not supported by the mold cylinder 1, therefore, the lifting assembly 6 needs to be used for auxiliary support;

[0069] When the mold cylinder 1 moves to the right to the unloading position, the pipe is completely supported by the lifting assembly 6, at this time, the driving part of the lifting assembly 6 drives the lifting part to move downward, so that the pipe moves downward synchronously to the inner wall of the pipe abutting the pressing block 39, the guide rod 310 drives the locking rod 312 to move downward, so that the locking teeth 313 exit the locking groove 314, at this time, under the driving of the second linear displacement mechanism 5, the second sliding block 55 drives the material uniformizing cylinder 31 and the liquid injection pipe 42 to move to the left and exit to the outside of the pipe, while the material pulling plate 37 still stays in the mold cylinder 1; then the pipe can be taken away by the mechanical hand, and the taking-away process is not interfered by the material uniformizing cylinder 31 and the mold cylinder 1;

[0070] The above-mentioned actions can be repeated to realize the centrifugal casting of the batch of pipes.

[0071] The above-mentioned embodiments only express several embodiments of the present application, the description is more specific and detailed, but it cannot be understood as the limitation of the patent scope of the present application. It should be pointed out that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which belong to the protection scope of the present application.​

Claims

1. A casting apparatus for ductile iron castings, characterized in that, The centrifugal casting mechanism comprises a mold barrel (1) and a centrifugal driving assembly, the output end of the centrifugal driving assembly is in transmission connection with the mold barrel (1), the centrifugal driving assembly is used for driving the mold barrel (1) to rotate, wherein the barrel axis of the mold barrel (1) is horizontally arranged; The material uniformizing mechanism (3) comprises a material uniformizing barrel (31) and a material uniformizing driving assembly, the output end of the material uniformizing driving assembly is in transmission connection with the material uniformizing barrel (31), the material uniformizing driving assembly is used for driving the material uniformizing barrel (31) to rotate, a plurality of material uniformizing holes (36) are formed in the barrel wall of the material uniformizing barrel (31), and the material uniformizing barrel (31) is coaxially arranged in the mold barrel (1) in a liquid injection state, wherein the rotating direction of the material uniformizing barrel (31) is the same as that of the mold barrel (1), and the rotating speed of the material uniformizing barrel (31) is greater than that of the mold barrel (1) under the driving of the material uniformizing driving assembly; The liquid injection mechanism (4) is arranged in the material uniformizing barrel (31) and is used for delivering the molten liquid into the material uniformizing barrel (31); The liquid injection mechanism (4) comprises a liquid injection pipe (42) which extends into the material uniformizing barrel (31), a liquid injection port (422) is formed in the side of the liquid injection pipe (42), and a sealing assembly is arranged on one side of the liquid injection port (422) and is used for sealing the liquid injection port (422) after the liquid injection is completed; The sealing assembly comprises a sealing driving assembly, sealing plates (48), clamping plates (410) and side baffles (49), the output end of the sealing driving assembly is in transmission connection with the sealing plates (48), the sealing plates (48) are arranged in pairs, the pair of sealing plates (48) are symmetrically arranged on the two sides of the liquid injection port (422) along the axis direction of the liquid injection pipe (42), the two ends of the liquid injection port (422) are respectively fixedly connected with the side baffles (49) along the axis direction of the liquid injection pipe (42), the two ends of the sealing plates (48) are respectively fixedly provided with the clamping plates (410), the clamping grooves (411) are formed in the clamping plates (410), and the clamping grooves (411) are correspondingly arranged with the side baffles (49); When the sealing plates (48) are located at the initial position, the liquid injection port (422) is opened, and the clamping plates (410) are arranged at intervals with the side baffles (49); when the sealing plates (48) are located at the sealing position, the clamping plates (410) are sealingly abutted with the side baffles (49) through the clamping grooves (411), and the accommodation area is formed between the side baffles (49) and the sealing plates (48). The centrifugal driving assembly comprises a first driving gear (12), a first driven gear (11), a first motor (13), a supporting wheel (15) and a limiting roller (16), the output end of the first motor (13) is in transmission connection with the first driving gear (12), the first driving gear (12) is in meshing transmission with the first driven gear (11), the first driven gear (11) is fixedly arranged on the outer periphery of the mold barrel (1), the outer periphery of the mold barrel (1) is further fixedly provided with the supporting wheel (15), and the supporting wheel (15) is in rolling connection with the limiting roller (16).

2. The device for casting a ductile iron casting according to claim 1, wherein ​ 3. The device for casting a ductile iron casting according to claim 2, wherein The uniform material driving assembly comprises a second motor (32), a second driving gear (33) and a second driven gear (34), the output end of the second motor (32) is transmissionally connected with the second driving gear (33), the second driving gear (33) is transmissionally meshed with the second driven gear (34), and the second driven gear (34) is fixedly arranged on the uniform material cylinder (31), and the uniform material cylinder (31) is rotatably arranged on the second sliding base (55).

4. The device for casting a ductile iron casting according to claim 3, wherein The sealing driving assembly comprises a third motor (43), a third driving gear (44), a third driven gear (45) and a main shaft (46), the output end of the third motor (43) is transmissionally connected with the third driving gear (44), the third driven gears (45) are arranged in pairs, the third driven gears (45) arranged in pairs are meshed with each other, one of the third driven gears (45) is transmissionally meshed with the third driving gear (44), the third driven gears (45) are fixedly arranged on the corresponding main shafts (46), the main shafts (46) are fixedly connected with the swing arms (47), the swing arms (47) are fixedly connected with the sealing plates (48) at the ends away from the main shafts (46), and the third motor (43) and the third driving gear (44) are arranged on the second sliding base (55) respectively.

5. The device for casting a ductile iron casting according to claim 4, wherein The sealing plate (48) is inlaid with a heating element (481), and the heating element (481) is used for heating and keeping warm the metal melt in the accommodation area, and the heating element (481) is electrically connected with a temperature control element (482).

6. The device for casting a ductile iron casting according to claim 5, wherein The limiting roller (16) and the first motor (13) are arranged on the first sliding base (25), the second motor (32) and the second driving gear (33) are arranged on the second sliding base (55), the first sliding base (25) is arranged at the output end of the first linear displacement mechanism (2), the first linear displacement mechanism (2) is used for driving the first sliding base (25) to reciprocally move along the axis direction of the uniform material cylinder (31), and the second sliding base (55) is arranged at the output end of the second linear displacement mechanism (5), the second linear displacement mechanism (5) is used for driving the second sliding base (55) to reciprocally move along the axis direction of the mold cylinder (1). The inside of the mold cylinder (1) is further provided with a material pulling plate (37), the circumferential side wall of the material pulling plate (37) is attached to the circumferential inner wall of the mold cylinder (1), one side of the material pulling plate (37) away from the feeding end of the mold cylinder (1) is provided with a limiting block (38), the limiting block (38) is clamped and matched with the bottom end of the mold cylinder (1), the inside of the material pulling plate (37) is slidably installed with a guide rod (310), the outer end of the guide rod (310) is fixedly connected with a pressing block (39), the inner end of the guide rod (310) is fixedly connected with a locking rod (312), one end of the guide rod (310) close to the locking rod (312) is sleeved with a spring (311), the locking rod (312) has locking teeth (313) at the outer position of the material pulling plate (37), and the shaft end of the uniform material cylinder (31) is provided with a locking groove (314), and the locking teeth (313) are connected with the uniform material cylinder (31) through the locking groove (314). The mold cylinder (1) is provided with a lifting assembly (6) below, when the first linear displacement mechanism (2) drives the first sliding seat (25) to move the mold cylinder (1) to the discharging position away from the material uniformizing cylinder (31), the lifting part of the lifting assembly (6) holds the centrifugal casting formed pipe; and under the driving of the driving part of the lifting assembly (6), the lifting part lowers to press the pipe on the pressing block (39), and the locking tooth (313) exits the locking groove (314).

7. The device for casting a ductile iron casting according to claim 6, wherein The first linear displacement mechanism (2) comprises a fourth motor (21), a first sliding rail (22), a first screw rod (23) and a first sliding block (24), the output end of the fourth motor (21) is transmissionally connected with the first screw rod (23), the two ends of the first screw rod (23) are rotationally connected on the first sliding rail (22), the first sliding block (24) is threadedly connected on the first screw rod (23), and the first sliding block (24) is slidingly connected with the first sliding rail (22), the first sliding seat (25) is fixedly arranged on the first sliding block (24), the second linear displacement mechanism (5) comprises a fifth motor (51), a second sliding rail (52), a second screw rod (53) and a second sliding block (54), the output end of the fifth motor (51) is transmissionally connected with the second screw rod (53), the two ends of the second screw rod (53) are rotationally connected on the second sliding rail (52), the second sliding block (54) is threadedly connected on the second screw rod (53), and the second sliding block (54) is slidingly connected with the second sliding rail (52), the second sliding seat (55) is fixedly arranged on the second sliding block (54).

8. The device for casting a ductile iron casting according to claim 1, wherein The end plate (35) is fixedly arranged on the material uniformizing cylinder (31), when the material uniformizing cylinder (31) is located at the material uniformizing position, the end plate (35) frictionally abuts against the feeding end of the mold cylinder (1).

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