A centrifugal casting apparatus for producing a drain pipe

Abstract

The application belongs to the technical field of centrifugal casting and specifically relates to a centrifugal casting equipment for producing a drain pipe. The centrifugal casting machine body is provided with a track on the bottom. A pipe mold is arranged in the centrifugal casting machine body. The pipe mold is in transmission connection with a driving mechanism. A pouring mechanism is arranged on the right side of the centrifugal casting machine body. The pouring mechanism comprises a containing bin. A ring disc is arranged on the left side of the containing bin. A pouring pipe is rotatably arranged in the ring disc. An inlet is arranged on the inner left side wall of the containing bin. Uniformly arranged pouring grooves are arranged on the outer surface of the pouring pipe. A push disc is slidably arranged in the pouring pipe. Uniformly arranged sliding shafts are fixed on the outer surface of the push disc. Uniformly arranged arc-shaped plates are fixed on the right side surface of the push disc. The pouring mechanism can shorten the total time length of the liquid metal covering the inner wall of the whole pipe mold, reduce the time difference between the landing and solidification of the liquid metal at different positions, and further reduce the probability of forming defects.

Description

Technical Field

[0001] This invention belongs to the field of centrifugal casting technology, specifically a centrifugal casting equipment for producing drainage pipes. Background Technology

[0002] In building indoor sewage and municipal underground pipe network systems, centrifugally cast alloy drainage pipes have become the core pipe material for high-rise drainage and municipal sewage applications due to their advantages such as dense structure, strong impermeability, and long service life. Traditional sand-cast alloy drainage pipes generally suffer from defects such as loose pipe walls, numerous pores and slag inclusions, and poor dimensional accuracy. In contrast, the centrifugal casting process relies on the centrifugal force field generated by high-speed rotation, which allows the liquid metal to automatically discharge slag and air during the forming process, and to achieve layer-by-layer densification and feeding, significantly improving the density and mechanical properties of the pipe material. At the same time, it can form smooth inner holes without the need for an internal core, and its production efficiency and finished product quality are significantly better than gravity casting. Therefore, it has become the mainstream process for the production of metal drainage pipes.

[0003] Currently, the industry widely uses horizontal water-cooled metal mold centrifugal casting equipment for the large-scale production of drainage pipes. This equipment mainly includes an inclined bed, a main machine traveling trolley that can reciprocate along the axial direction of the bed, a cylindrical pipe mold mounted on the traveling trolley, a roller friction transmission mechanism that drives the pipe mold to rotate at high speed, and a fixed cantilevered pouring channel. Its core casting principle is as follows: the pipe mold rotates at high speed around its own axis under the drive of the roller assembly to provide the stable centrifugal force field required for casting; the pouring channel extends into the inner cavity from the pipe mold's inlet end and maintains a fixed spatial position, and the pre-treated liquid metal is continuously transported into the pipe mold through the channel; at the same time, the main machine traveling trolley drives the pipe mold to move at a uniform speed along the axial direction towards the inlet end, so that the liquid metal landing point forms a continuous spiral trajectory relative to the inner wall of the pipe mold, and gradually fills the entire inner wall of the pipe mold in a spiral band; under the continuous action of centrifugal force, the liquid metal cools and solidifies tightly against the mold wall, finally forming a hollow tubular casting.

[0004] When liquid metal is sequentially laid in a spiral pattern, there is a natural time difference between the landing and initial solidification of adjacent spiral layers. The liquid metal that first contacts the mold wall is rapidly cooled by the water-cooled mold wall, causing it to solidify on the surface and form an oxide film within a short time. Subsequent liquid metal layers cannot completely remelt this oxide film, making it difficult to achieve sufficient metallurgical bonding. This results in continuous spiral cold shuts and overlapping defects inside the pipe wall, directly disrupting the continuity of the pipe wall structure, reducing the pipe's pressure-bearing capacity, and becoming a major cause of leakage during hydrostatic testing and subsequent corrosion failure. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies and solve the above-mentioned technical problems, this invention proposes a centrifugal casting equipment for producing drainage pipes. By setting up a pouring mechanism, the total time for liquid metal to cover the entire inner wall of the pipe mold can be shortened, the time difference between liquid metal landing and solidification at different locations can be reduced, thereby reducing the probability of forming defects. The specific structure is as follows.

[0006] A centrifugal casting equipment for producing drainage pipes includes a centrifugal casting machine body; a track is laid at the bottom of the centrifugal casting machine body, and the centrifugal casting machine body moves along the track via a walking mechanism; a pipe mold is provided inside the centrifugal casting machine body; the pipe mold is connected to a driving mechanism and is used to drive the pipe mold to rotate. The centrifugal casting machine body is provided with a pouring mechanism on the right side; the pouring mechanism includes a hopper; an annular plate is installed on the left side of the hopper; a pouring pipe rotates within the annular plate and extends to the left. An inlet is provided on the left side wall inside the container, and the inlet is connected to the casting pipe; the outer surface of the casting pipe is provided with uniformly arranged casting grooves. Each of the casting grooves is provided with an arc-shaped guide groove on the left side, and the top and bottom of the arc-shaped guide groove are horizontal, while the middle part is arc-shaped; the arc-shaped guide groove is opened in the inner circle of the casting pipe and is connected to the adjacent casting groove, and the side of the arc-shaped guide groove that is connected to the casting groove is rounded. A pusher plate slides inside the casting pipe; a uniformly arranged sliding shaft is fixed on the outer ring surface of the pusher plate, and the sliding shaft cooperates with the arc-shaped guide groove; in the initial state, the pusher plate is located on the left side of the ring plate, and the sliding shaft is located in the casting groove. The right side surface of the push plate is fixed with evenly arranged arc-shaped plates, which fit against the inner ring of the pouring pipe and cover and seal the pouring groove in the initial state; the arc-shaped plates extend through the container to the right side of the container. The bottom of the container is provided with a mounting frame, and a support frame is installed on the right side of the mounting frame; a first hydraulic rod is installed on the support frame, and the other side of the extension rod of the first hydraulic rod passes through the container and is rotatably mounted on the push plate; A cylinder is provided on the right side of the container, and the extension rod of the first hydraulic rod passes through the inside of the cylinder; a first arc-shaped groove is evenly arranged in the inner wall of the outer ring of the cylinder, and an arc-shaped plate passes through the first arc-shaped groove; The left end of the cylinder is provided with a baffle plate, and the outer ring of the baffle plate is provided with a second arc-shaped groove, and the arc-shaped plates all pass through the second arc-shaped groove; the outer ring of the cylinder is provided with a sliding ring; the two sides of the sliding ring are provided with a first electric push rod, and the other side of the first electric push rod is provided on the side of the container. The ring disc and the left side of the centrifugal casting machine body are respectively equipped with transmission mechanisms.

[0007] In a preferred embodiment of the present invention, the transmission mechanism includes a drive roller; The tube mold is provided with uniformly arranged drive rollers on both sides; the drive roller located on the right side of the tube mold rotates on the ring disk and is driven by the first motor, which is installed inside the ring disk. The outer ring of the drive roller located on the left side of the tube mold is provided with a ring, and the drive roller rotates in the inner ring and is driven by a second motor; A drive block is fixed to the outer ring of the circular ring; a third motor is provided below the drive block and is installed inside the centrifugal casting machine body; the third motor is used to drive the drive block to rotate.

[0008] In a preferred embodiment of the present invention, the inner cavity of the ring facing the annular disk is rounded. The drive rollers located on the inner ring of the ring are all rounded on the side facing the ring disk.

[0009] In a preferred embodiment of the present invention, the ring disk is provided with uniformly arranged limiting rods, and the end of the limiting rod away from the ring disk is spherical. Each of the outer rings of the mold tubes located within the centrifugal casting machine body has a limiting groove, and the limiting groove corresponds one-to-one with the limiting rod.

[0010] In a preferred embodiment of the present invention, both sides of the arc-shaped plate are arc surfaces.

[0011] In a preferred embodiment of the present invention, the bottom surface of the inner cavity of the container is an arc surface that is high in the middle and low on both sides; The container has openings on both sides, and the openings are connected to the lowest point of the bottom surface of the container's inner cavity. Each of the opening sides is fitted with a baffle, and the baffle blocks the opening in the initial state; a second electric actuator is fixedly installed on the ring plate, and the extension rod of the second electric actuator is fixed to the baffle by a stop block.

[0012] In a preferred embodiment of the present invention, a flow chamber is fixed below each of the two openings; The baffle passes through one side of the flow chamber and is slidably connected to the flow chamber.

[0013] In a preferred embodiment of the present invention, the baffle is in contact with the cylinder in the initial state; The right side surface of the baffle has a rotating ring; the right side of the cylinder is provided with a second hydraulic rod, and the extension rod of the second hydraulic rod is fixed on the rotating ring; The second hydraulic rod has a mounting plate installed at its bottom; a slider is fixed at the bottom of the mounting plate; a groove is provided on the support frame, and the slider slides in the groove. The mounting plate near the rotating ring is fixed to the rotating ring by a connecting plate.

[0014] As a preferred embodiment of the present invention, the inner and outer ring surfaces of the casting pipe, the arc plate, the baffle, the cylindrical surface, the extension rod of the first hydraulic rod, and the inside of the casting groove are all coated with an anti-stick coating, and the coating is boron nitride paint. An electric heating wire is installed inside the pouring pipe; an electric heating wire is also installed in the side wall of the hopper.

[0015] The beneficial effects of this invention are as follows: 1. The centrifugal casting equipment for producing drainage pipes described in this invention, through its structural design of liquid metal inside the casting pipe and simultaneous discharge from multiple circumferential casting tanks, combined with the material distribution method of the casting pipe and the mold rotating in opposite directions, enables the liquid metal to be simultaneously distributed to multiple circumferential positions on the inner wall of the mold. This avoids the forming mode of liquid metal being laid out in a spiral strip in the prior art, helps to shorten the total time for liquid metal to cover the entire inner wall of the mold, reduces the time difference between liquid metal landing and solidification at different positions, thereby reducing the probability of forming defects and helping to improve the uniformity of the structure and the overall quality of the finished drainage pipe.

[0016] 2. The centrifugal casting equipment for producing drainage pipes described in this invention, through a feeding method that combines silo storage with axial advancement by a pusher, enables liquid metal to smoothly fill the inner cavity of the casting pipe. During the filling process, gas inside the pipe can be gradually discharged, which helps to reduce gas entrapment defects in the liquid metal. At the same time, it is convenient to accurately control the total amount of liquid metal poured in a single pour. Combined with the scraping action of the inlet on the surface of the arc plate, it can reduce the adhesion and residue of liquid metal, and also avoid the problem of residual iron dripping and splashing when the casting mechanism is removed after the pouring is completed.

[0017] 3. The centrifugal casting equipment for producing drainage pipes described in this invention can scrape and gather the residual liquid metal on the inner wall of the pouring pipe and the surface of the arc plate during the movement of the baffle plate, so that the dispersed residual iron gradually gathers and is discharged outward through the pouring tank under the centrifugal force of the rotating pouring pipe. As the baffle plate continues to advance until it is in contact with the surface of the push plate, the remaining liquid metal in the gap is completely squeezed out, which can reduce the residual iron remaining in the inner cavity of the pouring pipe and the surface of the arc plate. This structure, by combining axial scraping and centrifugal discharge, can effectively reduce the amount of residual liquid metal on the inner wall of the pipe and the gap of the arc plate, avoid the residual iron from cooling and solidifying and agglomerating, affecting the sealing of subsequent pouring, reduce the risk of residual iron mixing with newly poured liquid metal and causing inclusion defects in the casting, and at the same time help to improve the utilization rate of liquid metal and reduce the workload of internal cleaning and maintenance of the equipment. Attached Figure Description

[0018] The invention will now be further described with reference to the accompanying drawings.

[0019] Figure 1 This is an overall diagram of the centrifugal casting equipment of the present invention; Figure 2This is a structural diagram of the centrifugal casting machine body in this invention; Figure 3 This is a structural diagram of the casting mechanism in this invention; Figure 4 This is a structural diagram showing the separation of the casting mechanism in this invention; Figure 5 This is a structural diagram showing the separation of the casting pipe, pusher plate, arc plate, baffle plate, and cylinder in this invention; Figure 6 This is the present invention. Figure 5 Enlarged view of a portion of point A in the middle; Figure 7 This is a top view of the centrifugal casting equipment of the present invention; Figure 8 This is the present invention. Figure 7 A cross-sectional view of section BB of a centrifugal casting equipment where liquid metal is about to enter the gating pipe; Figure 9 This is the present invention. Figure 8 Enlarged view of a section at point C; Figure 10 This is the present invention. Figure 7 Cross-sectional view of section BB when the centrifugal casting equipment is ready to pour; Figure 11 This is the present invention. Figure 10 Enlarged view of a section at point D; Figure 12 This is the present invention. Figure 10 Enlarged view of a section at point E in the middle; Figure 13 This is a diagram showing the state of the casting groove of the casting pipe in this invention as it changes from closed to open.

[0020] In the diagram: 1. Centrifugal casting machine body; 11. Tube mold; 12. Limiting slot; 2. Storage chamber; 21. Ring disc; 22. Casting pipe; 23. Casting trough; 24. Inlet; 25. Arc-shaped guide groove; 26. Limiting rod; 3. Push plate; 31. Sliding shaft; 32. Arc-shaped plate; 4. Mounting frame; 41. Support frame; 42. First hydraulic rod; 43. Cylinder; 44. First arc-shaped groove; 45. Baffle plate; 46. Second arc-shaped groove; 5. Slip ring; 51. First electric actuator; 6. Drive roller; 61. Circular ring; 62. Drive block; 7. Opening; 71. Baffle plate; 72. Second electric actuator; 73. Flow chamber; 8. Rotary ring; 81. Second hydraulic rod; 82. Mounting plate. Detailed Implementation

[0021] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0022] like Figures 1 to 13As shown, the centrifugal casting equipment for producing drainage pipes according to the present invention, as an embodiment of the present invention, includes a centrifugal casting machine body 1; a track is laid at the bottom of the centrifugal casting machine body 1, and the centrifugal casting machine body 1 is driven to move along the track by a walking mechanism; a pipe mold 11 is provided inside the centrifugal casting machine body 1; the pipe mold 11 is connected to a driving mechanism and is used to drive the pipe mold 11 to rotate; a pouring mechanism is provided on the right side of the centrifugal casting machine body 1; the pouring mechanism includes a hopper 2; an annular disk 21 is installed on the left side of the hopper 2; a pouring pipe 22 rotates inside the annular disk 21 and extends to the left; an inlet 24 is opened on the left side wall inside the hopper 2, and the inlet 24 is connected to the pouring pipe 22; and uniformly arranged pouring grooves 23 are opened on the outer surface of the pouring pipe 22. Each of the casting grooves 23 has an arc-shaped guide groove 25 on its left side, with the top and bottom of the arc-shaped guide groove 25 being horizontal and the middle being arc-shaped; the arc-shaped guide groove 25 is opened in the inner circle of the casting pipe 22 and communicates with the adjacent casting groove 23, and the side of the arc-shaped guide groove 25 that communicates with the casting groove 23 is rounded; a pusher plate 3 slides inside the casting pipe 22; a uniformly arranged sliding shaft 31 is fixed on the outer circle surface of the pusher plate 3, and the sliding shaft 31 cooperates with the arc-shaped guide groove 25; in the initial state, the pusher plate 3 is located on the left side of the ring plate 21, and the sliding shaft 31 is initially located inside the casting groove 23; The right side surface of the push plate 3 is fixed with uniformly arranged arc-shaped plates 32, and the arc-shaped plates 32 are in contact with the inner ring of the pouring pipe 22, covering and sealing the pouring groove 23 in the initial state; the arc-shaped plates 32 extend through the container 2 to the right side of the container 2. The bottom of the container 2 is provided with a mounting frame 4, and a support frame 41 is installed on the right side of the mounting frame 4; a first hydraulic rod 42 is installed on the support frame 41, and the other side of the extension rod of the first hydraulic rod 42 passes through the container 2 and is rotatably mounted on the push plate 3. The right side of the container 2 is provided with a cylinder 43, and the extension rod of the first hydraulic rod 42 passes through the inside of the cylinder 43; the inner wall of the outer ring of the cylinder 43 is provided with a uniformly arranged first arc-shaped groove 44, and the arc plate 32 passes through the first arc-shaped groove 44. The left end of the cylinder 43 is provided with a baffle 45, and the outer ring of the baffle 45 is provided with a second arc groove 46, and the arc plates 32 all pass through the second arc groove 46; the outer ring of the cylinder 43 is provided with a sliding ring 5; the two sides of the sliding ring 5 are provided with a first electric push rod 51, and the other side of the first electric push rod 51 is provided on the side of the container 2; the ring plate 21 and the left side of the centrifugal casting machine body 1 are respectively provided with a transmission mechanism.

[0023] In this embodiment, the transmission mechanism includes a drive roller 6; drive rollers 6 are evenly arranged on both sides of the tube mold 11; the drive roller 6 located on the right side of the tube mold 11 rotates on the ring disk 21 and is driven by a first motor, which is installed inside the ring disk 21; the drive roller 6 located on the left side of the tube mold 11 has a ring 61 on its outer ring, and the drive roller 6 rotates on the inner ring of the ring 61 and is driven by a second motor; a drive block 62 is fixed on the outer ring of the ring 61; a third motor is provided below the drive block 62 and is installed inside the centrifugal casting machine body 1; the third motor is used to drive the drive block 62 to rotate.

[0024] In this embodiment, the inner cavity of the ring 61 facing the ring disk 21 is rounded; the drive roller 6 located on the inner ring of the ring 61 is also rounded on the side facing the ring disk 21.

[0025] During the casting of the drainage pipe, the centrifugal casting machine body 1 is first controlled to move along the track via the traveling mechanism, causing the centrifugal casting machine body 1 to gradually move the pipe mold 11 closer to the pouring pipe 22 on the side of the pouring mechanism, so that the pouring pipe 22 is gradually inserted into the pipe mold 11; when the pouring groove 23 opened on the pouring pipe 22 is fully inserted into the corresponding position inside the pipe mold 11, the centrifugal casting machine body 1 is controlled to stop axial movement via the traveling mechanism; during the process of the pouring pipe 22 being inserted into the pipe mold 11, the third motor is synchronously controlled to drive the drive block 62 to rotate, and the drive block 62 drives the ring 61 to rotate synchronously. When the ring 61 rotates... Once the axis of the ring 61 is aligned with the axis of the casting pipe 22, the ring 61 and the casting pipe 22 are aligned. Then, the casting pipe 22 continues to be inserted into the inner cavity of the ring 61 along the axial direction and enters the space enclosed by multiple sets of drive rollers 6 inside the ring 61. Since the inner edge of the ring 61 facing the ring disk 21 is rounded, it can guide the insertion of the casting pipe 22, making the casting pipe 22 insert into the ring 61 more smoothly. At the same time, the drive rollers 6 on the inner ring of the ring 61 facing the ring disk 21 are also rounded, which can guide the casting pipe 22 to be smoothly embedded between the multiple sets of drive rollers 6.

[0026] Specifically, after the casting pipe 22 is inserted into the ring 61 and aligned, the first hydraulic rod 42 is retracted, pulling the pusher 3 to move to the left of the ring 21. Simultaneously, the pusher 3 drives the sliding shaft 31 on its outer ring to slide along the casting groove 23 until the sliding shaft 31 reaches the rightmost position of the casting groove 23. At the same time, the pusher 3 drives multiple evenly arranged arc-shaped plates 32 to move synchronously. The arc-shaped plates 32 pass sequentially through the second arc-shaped groove 46 on the outer ring of the baffle 45 and the first arc-shaped groove 44 on the inner wall of the cylinder 43, finally moving to the right side of the cylinder 43. Then, the molten metal is introduced into the container 2. A heating and insulation unit is installed in the side wall of the container 2 to continuously heat and insulate the molten metal inside, preventing the molten metal from cooling too quickly and affecting its fluidity. The molten metal in the container 2 flows into the casting pipe through the inlet 24 opened in the side wall. The liquid metal enters the pouring tube 22 and contacts the left side surface of the pusher plate 3. After the liquid metal fills the inner cavity of the pouring tube 22 on the right side of the pusher plate 3, it continuously replenishes the container 2 with liquid metal. Then, the first hydraulic rod 42 is controlled to extend at a uniform speed, gradually pushing the pusher plate 3 to move to the left along the inner cavity of the pouring tube 22. The pusher plate 3 simultaneously drives multiple arc plates 32 to move to the left. The arc plates 32 will pass through the inlet 24 of the container 2 in sequence. When the arc plates 32 enter the pouring tube 22, the edge of the inlet 24 will scrape the surface of the arc plates 32, scraping off the liquid metal adhering to the surface of the arc plates 32 and letting it fall back into the container 2. After the arc plates 32 gradually enter the inner cavity of the pouring tube 22, the outer arc surface of the arc plates 32 is tightly attached to the inner wall of the pouring tube 22, and at the same time, it forms a cover and seal on the pouring tank 23 to prevent the liquid metal from flowing out of the pouring tank 23 in advance.

[0027] More specifically, when the pusher plate 3 moves the sliding shaft 31 to the left end of the casting groove 23, the sliding shaft 31 smoothly enters the horizontal section at the top of the arc-shaped guide groove 25. At this time, the first hydraulic rod 42 is controlled to stop its extension action; then the first electric push rod 51 is controlled to retract. The retracted first electric push rod 51 pulls the slip ring 5 to move axially. Since the slip ring 5 is rotated and sleeved on the outer ring of the cylinder 43, it will drive the cylinder 43 to extend into the container 2 synchronously, and at the same time drive the baffle plate 45 to move axially together; when the cylinder 43 and the baffle plate 45 are in contact... During the movement, the first arc-shaped groove 44 on the inner wall of the cylinder 43 and the second arc-shaped groove 46 on the outer ring of the baffle 45 will slide along the surface of the arc plate 32, ensuring that the arc plate 32 only undergoes axial displacement and does not have circumferential displacement; when the left end face of the cylinder 43 is in contact with the inner side wall of the container 2, the side wall of the cylinder 43 completely blocks the inlet 24, and at the same time, the baffle 45 enters the right inner cavity of the pouring pipe 22, blocking the right end of the pouring pipe 22, completing the sealing preparation before pouring, and then the formal casting process can be entered.

[0028] Furthermore, during the casting process, the mold 11 is first driven to rotate around its own axis by the drive mechanism. Then, the first motor and the second motor control the drive rollers 6 on both sides of the casting pipe 22 to rotate. The rotating drive rollers 6 drive the casting pipe 22 to rotate synchronously by friction, and the rotation direction of the casting pipe 22 is opposite to the rotation direction of the mold 11. During the rotation of the casting pipe 22, since the sliding shaft 31 is fitted into the horizontal section at the top of the arc-shaped guide groove 25, the sliding shaft 31 will drive the push plate 3 to rotate synchronously. The push plate 3 is rotatably connected to the extension rod of the first hydraulic rod 42, and the first hydraulic rod 42 itself remains stationary and does not rotate. The rotating push plate 3 drives multiple arc-shaped plates 32 to rotate circumferentially together. The rotating arc-shaped plates 32 synchronously drive the baffle 45 and the cylinder 43 to rotate together. Then, the first hydraulic rod 42 is controlled to continue to extend, and the push plate 3 continues to move to the left. The push plate 3 drives the sliding shaft 31 to move along the arc section of the arc-shaped guide groove 25. Under the trajectory limit of the arc-shaped guide groove 25, the rotating push plate 3 will be driven to deflect circumferentially within the casting pipe 22. During the deflection process, the push plate 3 drives the arc-shaped plates 32 to rotate circumferentially along the inner cavity of the casting pipe 22. At the same time, the arc-shaped plates 32 drive the baffle 45 and the cylinder 43 to rotate circumferentially synchronously. As the arc plate 32 rotates circumferentially, the originally blocked pouring trough 23 gradually opens. Therefore, under the centrifugal force generated by the high-speed rotation of the pouring pipe 22, the liquid metal in the pouring pipe 22 will be thrown outwards through multiple pouring troughs 23 simultaneously, and act on the inner wall of the rotating mold 11. Subsequently, under the centrifugal force generated by the rotation of the mold 11 itself, the liquid metal quickly and evenly covers the inner wall of the mold 11 until all the liquid metal in the pouring pipe 22 is thrown out and distributed. At the same time, the liquid metal in the mold 11 cools and solidifies tightly against the mold wall under the continuous action of centrifugal force, and finally forms a hollow tubular casting. After casting is completed, the centrifugal casting machine body 1 is controlled to drive the mold 11 to gradually move away from the pouring pipe 22. At the same time, the pusher plate 3 is pulled by the first hydraulic rod 42 to gradually return to the initial state, and the pouring trough 23 is blocked again. After all components are reset, the machine waits for the next casting process.

[0029] Furthermore, through the structural design of liquid metal built into the casting pipe 22 and multiple circumferential casting grooves 23 for simultaneous material discharge, combined with the material distribution method of the casting pipe 22 and the pipe mold 11 rotating in opposite directions, the liquid metal can be simultaneously distributed to multiple circumferential positions on the inner wall of the pipe mold 11. This avoids the forming mode of liquid metal being laid out in a spiral strip in the prior art, which helps to shorten the total time for liquid metal to cover the entire inner wall of the pipe mold 11, reduces the time difference between liquid metal landing and solidification at different positions, thereby reducing the probability of forming defects and helping to improve the uniformity of the structure and the overall quality of the finished drainage pipe.

[0030] By using the material storage in the hopper 2 and the axial feeding method of the pusher plate 3, the liquid metal can be smoothly filled into the inner cavity of the pouring pipe 22. During the filling process, the gas in the pipe can be gradually discharged, which helps to reduce the air entrapment defects in the liquid metal. At the same time, it is easy to accurately control the total amount of liquid metal poured in a single pour. In addition, the scraping action of the inlet 24 on the surface of the arc plate 32 can reduce the adhesion and residue of liquid metal, and also avoid the problem of residual iron dripping and splashing when the pouring mechanism is removed after the pouring is completed.

[0031] As an embodiment of the present invention; the ring disk 21 has uniformly arranged limiting rods 26 rotating on it, and the end of the limiting rod 26 away from the ring disk 21 is spherical; the outer ring of the tube mold 11 is provided with limiting grooves 12 inside the centrifugal casting machine body 1, and the limiting grooves 12 correspond one-to-one with the limiting rods 26; both sides of the arc plate 32 are arc surfaces.

[0032] Because the annular disk 21 is equipped with evenly arranged limiting rods 26, when the centrifugal casting machine body 1 drives the mold 11 to gradually approach the pouring pipe 22, the evenly arranged limiting rods 26 will align and insert into the corresponding limiting slots 12 on the outside of the mold 11. Since the end of the limiting rod 26 away from the annular disk 21 is spherical, it can be inserted into the limiting slot 12 more smoothly, reducing the jamming problem caused by alignment deviation. When the pouring pipe 22 is fully inserted into the preset position inside the mold 11, the limiting rods 26 are simultaneously fully inserted into the corresponding limiting slots 12. Therefore, in... During the high-speed rotation of the pipe mold 11, the evenly arranged limiting rods 26 rotate synchronously with the pipe mold 11. The multiple limiting rods 26 together form a circumferential multi-point limiting support for the outer ring of the pipe mold 11. Relying on the fitting constraint of the limiting rods 26 and the limiting through grooves 12, the radial displacement of the pipe mold 11 can be effectively limited, avoiding radial runout during the high-speed rotation of the pipe mold 11. This structure can improve the coaxiality and stability of the rotation of the pipe mold 11, reduce forming defects such as wall thickness fluctuation and uneven material distribution caused by the runout of the pipe mold 11, and help ensure the dimensional accuracy and forming quality of the drainage pipe casting.

[0033] Specifically, since both sides of the arc plate 32 are arc-shaped structures, when the casting tank 23 is gradually opened and the casting pipe 22 is in a high-speed rotating state, the liquid metal inside the casting pipe 22 flows towards the pipe wall under the action of centrifugal force. When the liquid metal flows through the two sides of the arc plate 32, it will smoothly flow and converge along the side arc surface, and finally be thrown out through the casting tank 23, which can further promote the smooth discharge of the liquid metal inside the casting pipe 22. This arc-shaped flow guiding structure can reduce the retention and adhesion of liquid metal on the side of the arc plate 32, reduce the residual iron in the casting pipe 22, help improve the utilization rate of liquid metal in a single casting and the uniformity of material distribution, and at the same time reduce the adverse effects of residual iron solidification and agglomeration on the sealing performance of the subsequent sealing structure.

[0034] As an embodiment of the present invention; the bottom surface of the inner cavity of the container 2 is an arc surface that is high in the middle and low on both sides; the container 2 is provided with openings 7 on both sides, and the openings 7 are connected to the lowest point of the bottom surface of the inner cavity of the container 2; baffles 71 are attached to the sides of the openings 7, and the baffles 71 block the openings 7 in the initial state; a second electric push rod 72 is fixedly installed on the ring disk 21, and the extension rod of the second electric push rod 72 is fixed to the baffle 71 by a stop block; flow chambers 73 are fixed below the two openings 7; the baffles 71 pass through one side of the flow chambers 73 and are slidably connected to the flow chambers 73.

[0035] Because the bottom surface of the inner cavity of the container 2 is designed as an arc-shaped structure with a high center and low sides, when the cylinder 43 moves into the container 2 and fits tightly against the inlet 24, the introduction of liquid metal into the container 2 stops. Then, the second electric push rod 72 is controlled to retract. The second electric push rod 72 drives the baffle 71 to move synchronously through the stop block, so that the baffle 71 gradually releases the blockage of the opening 7. As the opening 7 gradually opens, the liquid metal remaining in the container 2 will flow naturally to both sides along the arc-shaped bottom wall with a high center and low sides, and finally be discharged outward through the openings 7 on both sides. This structure can effectively prevent the molten liquid metal from remaining in the container 2 for a long time and cooling and solidifying, reduce the problem of residual iron accumulating at the bottom of the container 2, help maintain the cleanliness of the container 2, reduce the risk of residual iron mixing into the subsequent liquid metal pouring and causing casting defects, and at the same time reduce the workload of equipment cleaning and maintenance.

[0036] Specifically, since flow chambers 73 are fixedly installed below both openings 7, baffles 71 penetrate from one side wall of flow chamber 73 and form a sliding connection with flow chamber 73. During the reciprocating movement of baffles 71 with the second electric push rod 72, flow chambers 73 can limit and guide the sliding trajectory of baffles 71, ensuring the smoothness of the blocking and opening action of baffles 71. When opening 7 is opened, the liquid metal flowing out from the container 2 will directly enter the interior of the flow chamber 73 below, and be orderly discharged and collected outwards by the guidance of flow chamber 73.

[0037] In one embodiment of the present invention, the baffle 45 is initially attached to the cylinder 43; a rotating ring 8 is rotatably mounted on the right side surface of the baffle 45; a second hydraulic rod 81 is provided on the right side of the cylinder 43, and the extension rod of the second hydraulic rod 81 is fixed on the rotating ring 8; a mounting plate 82 is installed at the bottom of the second hydraulic rod 81; a slider is fixed at the bottom of the mounting plate 82; a sliding groove is provided on the support frame 41, and the slider slides in the sliding groove; the mounting plate 82 near the rotating ring 8 is fixed to the rotating ring 8 by a connecting plate. In this embodiment, the inner and outer ring surfaces of the casting pipe 22, the arc plate 32, the baffle 45, the surface of the cylinder 43, the extension rod of the first hydraulic rod 42, and the interior of the casting groove 23 are all coated with an anti-stick coating, and the coating is boron nitride paint; an electric heating wire is installed inside the casting pipe 22; an electric heating wire is also installed in the side wall of the container 2.

[0038] Since the baffle 45 and cylinder 43 are initially in close contact, a rotating ring 8 is rotatably mounted on the right side surface of the baffle 45, and the extension rod of the second hydraulic rod 81 is fixedly connected to the rotating ring 8. During the pouring operation, when the arc plate 32 drives the baffle 45 to rotate synchronously in the circumferential direction, the baffle 45 can rotate relative to the rotating ring 8 on its right side, ensuring that the baffle 45 rotates smoothly with the arc plate 32 while the second hydraulic rod 81 and the mounting plate 82 maintain axial stability. When the rotating ring 8 moves axially towards the hopper 2 with the cylinder 43, it will pull the mounting plate 82 to move synchronously through the connecting plate, causing the slider to... Sliding smoothly along the chute, the second hydraulic rod 81 and the baffle 45 move axially synchronously, ensuring the synchronicity and stability of the overall structural displacement. After the rotating casting pipe 22 finishes throwing out the liquid metal, the second hydraulic rod 81 is extended to push the baffle 45 along the surface of the arc plate 32 and the inner cavity of the casting pipe 22 toward the push plate 3. During the movement of the baffle 45, the liquid metal remaining on the inner wall of the casting pipe 22 and the surface of the arc plate 32 can be scraped and gathered, so that the dispersed residual iron gradually gathers up and is discharged outward through the casting groove 23 under the centrifugal force of the rotating casting pipe 22. As the baffle 45 continues to advance until it is in contact with the surface of the pusher 3, the remaining liquid metal in the gap is completely squeezed out, which can reduce the residual iron remaining in the inner cavity of the pouring pipe 22 and the surface of the arc plate 32. This structure, through the combination of axial scraping and centrifugal discharge, can effectively reduce the amount of liquid metal remaining on the inner wall of the pipe and in the gap of the arc plate 32, avoid the residual iron from cooling and solidifying into lumps, affecting the sealing of subsequent pouring, reduce the risk of residual iron mixing into the newly poured liquid metal and causing casting inclusion defects, and at the same time help to improve the utilization rate of liquid metal and reduce the workload of internal cleaning and maintenance of the equipment.

[0039] Specifically, since electric heating wires are installed inside the pouring pipe 22 and also in the side wall of the container 2, the electric heating wires continuously release heat throughout the pouring process to heat and maintain the liquid metal inside the pouring pipe 22 and the container 2, respectively. This maintains the molten flow state of the liquid metal, prevents it from solidifying prematurely due to rapid temperature drop, and prevents blockage of the pouring tank 23 due to solidified residual iron. This ensures the smoothness and uniformity of the liquid metal being thrown out and distributed. Furthermore, the inner and outer ring surfaces of the pouring pipe 22, the arc plate 32, the baffle 45, the surface of the cylinder 43, and the extension rod of the first hydraulic rod 42 are all affected. The interior of the casting tank 23 is coated with a boron nitride anti-stick coating. This coating has excellent high-temperature resistance and non-wetting properties, which can effectively reduce the adhesion of molten liquid metal to the surface of each component, and reduce the phenomenon of liquid metal hanging on the wall and forming nodules. Combined with the heat preservation effect of the electric heating wire and the pushing and scraping cleaning effect of the baffle 45, the adhesion strength of residual iron can be further reduced, making it easier for residual liquid metal to be pushed, scraped and centrifuged out. This can not only extend the service life of each component and reduce the loss caused by high-temperature liquid metal adhesion corrosion, but also reduce the difficulty and time of residual iron cleaning, and ensure the long-term stability of equipment operation and the consistency of casting forming.

[0040] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the appendix. Figure 1 The orientations or positional relationships shown are for the convenience of describing the present invention and simplifying the description only, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and should not be construed as indicating or implying relative importance.

[0041] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A centrifugal casting equipment for producing drainage pipes, comprising a centrifugal casting machine body (1); a track is laid at the bottom of the centrifugal casting machine body (1); a pipe mold (11) is provided inside the centrifugal casting machine body (1); the pipe mold (11) is connected to a drive mechanism for transmission. Its features are, The centrifugal casting machine body (1) is provided with a pouring mechanism on the right side; the pouring mechanism includes a hopper (2); a ring disc (21) is installed on the left side of the hopper (2); a pouring pipe (22) rotates in the inner ring of the ring disc (21); An inlet (24) is provided on the left side wall inside the container (2); and uniformly arranged casting grooves (23) are provided on the outer surface of the casting pipe (22). Each of the casting grooves (23) is provided with an arc-shaped guide groove (25) on the left side; the arc-shaped guide groove (25) is opened in the inner circle of the casting pipe (22); A pusher plate (3) slides inside the pouring pipe (22); a uniformly arranged sliding shaft (31) is fixed on the outer ring surface of the pusher plate (3); The right side surface of the push plate (3) is fixed with evenly arranged arc-shaped plates (32), and the arc-shaped plates (32) are in contact with the inner ring of the pouring pipe (22); The bottom of the container (2) is provided with a mounting frame (4), and a support frame (41) is installed on the right side of the mounting frame (4); a first hydraulic rod (42) is installed on the support frame (41), and the other side of the extension rod of the first hydraulic rod (42) passes through the container (2) and is rotatably mounted on the push plate (3); The container (2) is provided with a cylinder (43) on the right side; the inner wall of the outer ring of the cylinder (43) is provided with a uniformly arranged first arc-shaped groove (44), and the arc plate (32) passes through the first arc-shaped groove (44); The left end of the cylinder (43) is provided with a baffle (45), and the outer ring of the baffle (45) is provided with a second arc groove (46), and the arc plates (32) all pass through the second arc groove (46); the outer ring of the cylinder (43) is provided with a sliding ring (5); the two sides of the sliding ring (5) are provided with first electric push rods (51); The ring disk (21) and the centrifugal casting machine body (1) are respectively equipped with transmission mechanisms on the left side.

2. The centrifugal casting equipment for producing drainage pipes according to claim 1, characterized in that: The transmission mechanism includes a drive roller (6); The tube mold (11) is provided with uniformly arranged drive rollers (6) on both sides; the drive roller (6) located on the right side of the tube mold (11) rotates on the ring disk (21) and is driven by the first motor, and the first motor is installed inside the ring disk (21); The drive roller (6) located on the left side of the tube mold (11) has a ring (61) on its outer ring, and the drive roller (6) rotates in the inner ring (61) and is driven by a second motor. A drive block (62) is fixed to the outer ring of the ring (61); a third motor is provided below the drive block (62), and the third motor is installed inside the centrifugal casting machine body (1); the third motor is used to drive the drive block (62) to rotate.

3. The centrifugal casting equipment for producing drainage pipes according to claim 2, characterized in that: The inner cavity of the ring (61) facing the ring disk (21) is rounded. The drive roller (6) located on the inner ring (61) facing the ring disk (21) has rounded corners on the side.

4. The centrifugal casting equipment for producing drainage pipes according to claim 3, characterized in that: The ring disk (21) has uniformly arranged limiting rods (26) rotating on it, and the end of the limiting rod (26) away from the ring disk (21) is spherical. The outer ring of the tube mold (11) is provided with a limiting groove (12) inside the centrifugal casting machine body (1), and the limiting groove (12) corresponds one-to-one with the limiting rod (26).

5. The centrifugal casting equipment for producing drainage pipes according to claim 4, characterized in that: Both sides of the curved plate (32) are curved surfaces.

6. The centrifugal casting equipment for producing drainage pipes according to claim 5, characterized in that: The bottom surface of the inner cavity of the container (2) is an arc surface that is high in the middle and low on both sides; The container (2) has openings (7) on both sides, and the openings (7) are connected to the lowest point of the bottom surface of the inner cavity of the container (2); The sides of the opening (7) are all fitted with baffles (71), and in the initial state, the baffles (71) block the opening (7); a second electric push rod (72) is fixedly installed on the ring disc (21), and the extension rod of the second electric push rod (72) is fixed on the baffle (71) by a stop block.

7. The centrifugal casting equipment for producing drainage pipes according to claim 6, characterized in that: Below each of the two openings (7) is a flow chamber (73); The baffle (71) passes through one side of the flow chamber (73) and is slidably connected to the flow chamber (73).

8. The centrifugal casting equipment for producing drainage pipes according to claim 7, characterized in that: In the initial state, the baffle (45) is in contact with the cylinder (43); The right side surface of the baffle (45) has a rotating ring (8); the right side of the cylinder (43) is provided with a second hydraulic rod (81), and the extension rod of the second hydraulic rod (81) is fixed on the rotating ring (8); The second hydraulic rod (81) is fitted with a mounting plate (82) at its bottom; a slider is fixed to the bottom of the mounting plate (82); a groove is provided on the support frame (41), and the slider slides in the groove. The mounting plate (82) near the rotating ring (8) is fixed to the rotating ring (8) by a connecting plate.

9. The centrifugal casting equipment for producing drainage pipes according to claim 8, characterized in that: The inner and outer ring surfaces of the casting pipe (22), the arc plate (32), the baffle (45), the surface of the cylinder (43), the extension rod of the first hydraulic rod (42), and the inside of the casting groove (23) are all coated with an anti-stick coating, and the coating is boron nitride paint. An electric heating wire is installed inside the casting pipe (22); an electric heating wire is also installed in the side wall of the container (2).

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