Cast pipe residual core cleaning system

Abstract

The utility model relates to a cast pipe residual core cleaning system which comprises a cast pipe. A supporting operation part; the collecting assemblies are arranged on the cast pipe residual core cleaning station and the two sides of the cast pipe bellmouth and the two sides of the cast pipe spigot respectively. The movable track is a track which is fixed at the upper part of the support frame and is parallel to the axis of the cast pipe; the collecting box is a box body which is opened towards the cast pipe side; linear driving; the waste sucking part is communicated with the collecting box and is used for sucking the waste collected in the collecting box; the device comprises a collecting box and a collecting assembly located on the bell mouth side of the cast pipe, and further comprises a slag cutting part which is fixedly connected with the collecting box, moves along with the collecting box, cuts off and peels off residual cores adhering to the interior of the bell mouth section of the cast pipe, blows the residual cores to the spigot end of the cast pipe and discharges the residual cores out of the spigot end of the cast pipe. And the residual core on the inner wall of the socket is cleaned.

Description

Technical Field

[0001] This utility model belongs to the field of finishing technology of ductile iron pipes, specifically relating to a pipe core cleaning system. Background Technology

[0002] The traditional centrifugal casting process for ductile iron pipes involves pouring spheroidized molten iron into a horizontal centrifuge. After centrifugation, the pipe is pulled out from the socket side by a pipe puller. This is similar to CN118808583A, a method for controlling the operation of pipe pullers used in the production of ultra-large diameter ductile iron pipes; CN110538979B, a pipe puller for centrifugal casting machines; and CN219378917U, a pipe puller mechanism for centrifuges. All of these disclose the process or equipment for pulling ductile iron pipes during centrifugal casting.

[0003] However, the inventors discovered during their research on existing technologies that, due to the requirements of mold casting, a sand core needs to be installed on the socket side of the ductile iron pipe during molding. After centrifugal casting, the pipe puller will penetrate deep into the socket and, through its expanding action, break the sand core located at the end. The broken sand core will naturally fall off during the pipe pulling process. However, precisely because of the expanding action of the pipe puller, a portion of the sand core will be compacted against the inner wall of the ductile iron pipe socket. If there is no external interference in a short period of time, this broken sand core (also known as the residual core) will gradually fall off during the operation of the ductile iron pipe, or be removed at the finishing and grinding station. Furthermore, since the cast iron pipe needs to go through an annealing station before finishing, the annealing station often uses a continuous annealing furnace. The annealing furnace operates using a chain, and the interior is high-temperature and enclosed. The residual core adhering to the inside of the socket will have two states: 1) it will fall off naturally under the action of high temperature; 2) it will remain adhered to the inner wall until the finishing station. The accumulation of residual cores that fall off at the annealing station will have a negative impact on the furnace and will be detrimental to the operation of the annealing station.

[0004] Therefore, there is an urgent need for a system for cleaning residual cores of cast pipes after centrifugal forming and before they enter the annealing furnace. Summary of the Invention

[0005] To overcome the problem of residual cores that are relatively firmly adhered to the inner wall of the socket side of the ductile iron pipe during the pipe pulling process and to reduce the impact on the annealing furnace, this utility model adopts high-pressure water gun cutting, high-pressure air peeling and blowing to the spigot side for discharge. By taking advantage of the tubular and closed characteristics of the ductile iron pipe itself, the residual cores can be cleaned up.

[0006] The technical solution adopted in this utility model is: a system for cleaning residual cores in cast iron pipes, comprising:

[0007] Ductile iron pipes, which are ductile iron pipes with sockets, are transported from the centrifugal casting station to the annealing station.

[0008] The support and rotating unit supports, rotates, and moves the cast pipe to the cast pipe residual core cleaning station.

[0009] Furthermore, it also includes collection assemblies respectively provided on both sides of the socket and spigot of the cast pipe at the cast pipe core cleaning station, the collection assemblies comprising:

[0010] Support frame;

[0011] The movable track is a track fixed to the upper part of the support frame and parallel to the axis of the cast pipe;

[0012] The collection box is a box that opens towards the side of the cast pipe;

[0013] Linear drive drives the collection box to reciprocate on the movable track, so that the socket and spigot ends of the cast pipe enter or move away from the interior of the collection box;

[0014] The waste suction unit is connected to the collection box and sucks up the waste collected inside the collection box;

[0015] And, the collecting assembly located on the socket side of the cast pipe further includes:

[0016] The slag-cutting section is fixedly connected to the collection box and moves with the collection box to cut off and peel off the residual core adhering inside the socket section of the cast pipe, blow it to the spigot end of the cast pipe and discharge it.

[0017] Furthermore,

[0018] The slag cutting section includes:

[0019] The slag cutting nozzle, with its opening perpendicular to the inner wall of the casting pipe socket section, sprays liquid medium to cut off and peel off the residual core adhering to the inside of the casting pipe socket section;

[0020] The slag blowing port has an opening at an acute angle to the inner wall of the casting pipe socket section, facing the casting pipe spigot side. Air is sprayed to blow the residual core that is cut and peeled off by the slag cutting port from the inside of the casting pipe socket section to the casting pipe spigot end.

[0021] Furthermore,

[0022] The opening directions of the slag cutting port and the slag blowing port are opposite to each other.

[0023] Furthermore,

[0024] The linear drive is a cylinder, hydraulic cylinder, or electric cylinder fixed on the support frame, with its telescopic end connected to the collection box.

[0025] Furthermore, the collection box and waste suction unit also include:

[0026] The sedimentation chamber is fixedly connected to the support frame and is located on the lower side of the collection component during operation. Its upper part is connected to the collection box and its periphery is connected to the waste suction section.

[0027] Alternatively, it can be fixedly connected and communicated with the collection box, and its periphery can communicate with the waste suction section.

[0028] Furthermore,

[0029] The sedimentation chamber is equipped with an openable waste discharge port at the bottom.

[0030] Furthermore,

[0031] When the sedimentation chamber is fixedly connected to the collection box, a variable diameter section is also provided between the sedimentation chamber and the waste suction section. The variable diameter section is a cone, and the apex of the cone is always located inside the waste suction section when the collection box moves.

[0032] The advantages of this invention over the prior art are: overcoming the prejudice that liquid media (such as water) cannot be used to treat ductile iron pipes between the centrifugation and annealing stations, and using high-pressure water and air, combined with dust extraction and external discharge design, to achieve the cleaning of residual cores on the inner wall of the socket. Attached Figure Description

[0033] Figure 1 This is a front view of a specific embodiment of the present utility model (including a perspective view between the collection box and the casting pipe).

[0034] Figure 2 Detailed structural diagrams of the components (socket side) are collected for specific embodiments of this utility model.

[0035] Figure 3 Top views of the components are collected for specific embodiments of this utility model;

[0036] Figure 4 This is a detailed structural diagram of the slag-cutting part according to a specific embodiment of the present utility model;

[0037] The annotation is represented as follows:

[0038] 100 - Cast iron pipe; 200 - Support and moving parts;

[0039] 300-Support frame; 310-Collection box; 311-Moving door; 312-Moving track; 320-Sedimentation chamber; 321-Waste discharge port;

[0040] 330 - Linear drive; 340 - Waste suction section; 341 - Variable diameter section;

[0041] 400 - Slag cutting section; 410 - Slag cutting opening; 420 - Slag blowing opening. Detailed Implementation

[0042] The technical solutions in the embodiments are clearly and completely described. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not 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 limitations on this utility model.

[0043] To overcome the problem of residual cores that are relatively firmly adhered to the inner wall of the socket side of the ductile iron pipe during the pipe pulling process and to reduce the impact on the annealing furnace, this utility model adopts high-pressure water gun cutting, high-pressure air peeling and blowing to the spigot side for discharge. By taking advantage of the tubular and closed characteristics of the ductile iron pipe itself, the residual cores can be cleaned up.

[0044] It should be noted that since the temperature of the cast pipe 100 exiting the centrifugal stage is typically between 600-800 degrees Celsius, and may still be above 500 degrees Celsius before entering the push-through stage, cleaning with a liquid medium is not feasible in conventional operations for those skilled in the art, as it would cause a rapid localized temperature drop, affecting the internal quality of the cast pipe. Through extensive experimentation, the inventors discovered that since the thickness of the socket side of the cast pipe is usually much greater than the wall thickness, and that cleaning by rotation followed by heating in the annealing stage has no significant impact on the overall quality of the cast pipe. This technical solution overcomes the biases of existing technologies and achieves water cleaning in specific sections. Please refer to... Figures 1 to 4 The technical solution of this utility model is as follows: a system for cleaning residual cores in cast iron pipes, comprising:

[0045] 100 is a ductile iron pipe with a socket that is transported from the centrifugal casting station to the annealing station.

[0046] The support and operation unit 200 supports, rotates, and moves the cast pipe 100 to the cast pipe core cleaning station. Generally, the support and operation unit 200 can be in the form of a roller, which is used to transport the pipe to the station by step or chain, and then the roller lifts and rotates the cast pipe 100.

[0047] Furthermore, it also includes collection assemblies respectively provided on both sides of the socket and spigot of the cast pipe 100 at the cast pipe residual core cleaning station, the collection assemblies comprising:

[0048] Support frame 300;

[0049] The movable track 312 is a track fixed to the upper part of the support frame 300 and parallel to the axis of the cast pipe 100;

[0050] The collection box 310 is a box that opens toward the side of the cast pipe 100;

[0051] A linear drive 330 drives the collection box 310 to reciprocate on the movable track 312, so that the socket and spigot ends of the cast pipe 100 enter or move away from the interior of the collection box 310; the linear drive 330 can be a gear and rack drive or the collection box 310 can be powered by itself.

[0052] The waste suction unit 340 is connected to the collection box 310 and sucks up the waste collected inside the collection box 310; negative pressure or suction is generated inside the waste suction unit 340 to discharge the dust generated during the cleaning process of the residual core inside the collection box 310.

[0053] And, the collecting assembly located on the socket side of the cast pipe 100 further includes:

[0054] The slag cutting section 400 is fixedly connected to the collection box 310 and moves with the collection box 310. It cuts off and peels off the residual core adhering inside the socket section of the cast pipe 100, blows it to the spigot end of the cast pipe 100 and discharges it.

[0055] In some embodiments, preferably, please refer to Figure 4 ,

[0056] The slag cutting section 400 includes:

[0057] The slag cutting port 410 is perpendicular to the inner wall of the socket section of the cast pipe 100. Liquid medium is sprayed to cut off and peel off the residual core adhering inside the socket section of the cast pipe 100. The medium is usually water, and it is pressurized water.

[0058] The slag blowing port 420 has an acute angle between its opening and the inner wall of the socket section of the cast pipe 100, facing the spigot side of the cast pipe 100. Air is sprayed to blow the residual core adhering to the inside of the socket section of the cast pipe 100, which has been cut off and peeled off by the slag cutting port 410, to the spigot end of the cast pipe 100. High-pressure air is usually used.

[0059] In some embodiments, please refer to Figure 4 To avoid interference between the slag cutting port 410 and the slag blowing port 420.

[0060] The opening directions of the slag cutting port 410 and the slag blowing port 420 are opposite.

[0061] In some embodiments, please refer to Figure 2 and Figure 3 ;

[0062] The linear drive 330 is a cylinder, hydraulic cylinder, or electric cylinder that is fixed on the support frame 300 and whose telescopic end is connected to the collection box 310.

[0063] In some embodiments, please refer to Figure 1 The collection box 310 and the waste suction unit 340 further include:

[0064] The sedimentation chamber 320 is fixedly connected to the support frame 300 and is located on the lower side of the collection component during operation. Its upper part is connected to the collection box 310 and its circumference is connected to the waste suction part 340.

[0065] Alternatively, it can be fixedly connected to and communicate with the collection box 310, and its periphery can communicate with the waste suction part 340. In this embodiment, there are two technical solutions: one is that the sedimentation chamber 320 is fixedly connected to the support frame 300, and there is a channel on the upper side that can dock with the collection box 310; the other is that the sedimentation chamber 320 is fixedly connected to the collection box 310 and moves synchronously with the collection box 310.

[0066] In other implementations, preferred,

[0067] The sedimentation chamber 320 is provided with an openable waste discharge port 321 at the bottom.

[0068] In some embodiments, please refer to Figure 1 and Figure 2 ,

[0069] When the sedimentation chamber 320 is fixedly connected to the collection box 310, a variable diameter section 341 is also provided between the sedimentation chamber 320 and the waste suction section 340. The variable diameter section 341 is a cone, and when the collection box 310 moves, the cone tip is always located inside the waste suction section 340.

[0070] In other embodiments, please refer to Figure 1 The collection assembly may also include an openable and closable lifting door. Since the collection assembly needs to accommodate cast iron pipes of a certain span, typically DN80-DN350 / DN300-800 / DN900-1200, the collection box 310 in the collection assembly must meet the maximum size requirement, which will result in a gap at the top of the cast iron pipe 100, causing dust to overflow. To overcome the dust overflow, an openable and closable lifting door can be used to reduce dust overflow.

[0071] In specific operation: the casting pipe 100 moves to this station, and under the action of the linear drive 330, the collection box 310 is fitted into both ends of the socket of the casting pipe 100. The slag cutting part 400 starts working, and the slag cutting port 410 sprays high-pressure water to cut and peel off the residual cores adhering to the inner wall of the socket of the casting pipe 100. The slag blowing port 420 peels off the residual cores remaining after being cut by the slag cutting port 410. At the same time, the slag blowing port 420 blows the removed residual cores to the spigot end, where they are captured by the sedimentation chamber 320 on the spigot side. Simultaneously, the supporting rotating part 200 supports the casting pipe 100. The residual cores are cleaned while the slag cutting part 400 remains stationary. Of course, it should be noted that the slag cutting part 400 can also rotate while the supporting rotating part 200 remains stationary, which is also a technical solution that can be achieved and should be considered an equivalent concept of this utility model.

[0072] The beneficial effects are: overcoming the prejudice that liquid media (such as water) cannot be used to treat ductile iron pipes between the centrifugation and annealing stations, by using high-pressure water and air, combined with dust extraction and external discharge design, to achieve the cleaning of residual cores on the inner wall of the socket. The above description is only a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the protection scope of this utility model.

Claims

1. A cast pipe core cleaning system, characterized by, The system comprises: a cast pipe (100) which is a ductile cast iron pipe with a socket and spigot, cast by a centrifugal casting station, transported to an annealing station; a support and rotation unit (200) which supports, rotates and transports the cast pipe (100) to a cast pipe core cleaning station; and further comprises a collection assembly arranged on both sides of the socket and spigot of the cast pipe (100) at the cast pipe core cleaning station, the collection assembly comprising: a support frame (300); a movable track (312) which is a track fixed on the upper part of the support frame (300) and parallel to the axis of the cast pipe (100); a collection box (310) which is a box open to the side of the cast pipe (100); a linear drive (330) which drives the collection box (310) to reciprocate on the movable track (312) so that the socket and spigot end of the cast pipe (100) enters or moves away from the inside of the collection box (310); a waste suction unit (340) which communicates with the collection box (310) and sucks the waste collected in the collection box (310); and the collection assembly on the socket side of the cast pipe (100) further comprises: a slag cutting unit (400) which is fixedly connected with the collection box (310) and moves with the collection box (310), cuts and peels the residual core adhered in the socket section of the cast pipe (100), and blows to the spigot end of the cast pipe (100) and discharges.

2. The cast pipe core cleaning system according to claim 1, wherein the slag cutting unit (400) comprises: a slag cutting port (410) which is open perpendicular to the inner wall of the socket section of the cast pipe (100), sprays liquid medium, and cuts and peels the residual core adhered in the socket section of the cast pipe (100); a slag blowing port (420) which is open at an acute angle with the inner wall of the socket section of the cast pipe (100), faces the spigot side of the cast pipe (100), sprays air, and blows the residual core adhered in the socket section of the cast pipe (100) cut and peeled by the slag cutting port (410) to the spigot end of the cast pipe (100).

3. The cast pipe core cleaning system according to claim 2, wherein the opening directions of the slag cutting port (410) and the slag blowing port (420) are opposite.

4. The cast pipe core cleaning system according to claim 1, wherein the linear drive (330) is a pneumatic cylinder, hydraulic cylinder or electric cylinder fixed on the support frame (300) and connected with the collection box (310) at the telescopic end.

5. The cast tube core knockout system of claim 1, wherein, the collection box (310) and the waste suction unit (340) further comprise: a deposition bin (320) which is fixedly connected with the support frame (300), located at the lower side during operation of the collection assembly, and communicates with the collection box (310) at the upper part and communicates with the waste suction unit (340) at the peripheral side; or, fixedly connected with the collection box (310) and communicating with the waste suction unit (340) at the peripheral side.

6. The cast pipe core cleaning system according to claim 5, wherein the lower part of the deposition bin (320) is provided with an openable and closable waste discharge port (321).

7. The cast pipe core cleaning system according to claim 5, wherein When the deposit bin (320) is fixedly connected with the collecting box (310), a variable-diameter part (341) is further arranged between the deposit bin (320) and the waste suction part (340), the variable-diameter part (341) is a cone, and the top of the cone is always located inside the waste suction part (340) when the collecting box (310) moves.

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