Cast pipe residual core cleaning system

Abstract

The invention 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] The invention belongs to the technical field of finishing of ductile iron pipes, and in particular relates to a system for cleaning residual cores of cast pipes. Background Art

[0002] The traditional centrifugal casting process of ductile iron pipes is to add spheroidized molten iron into a horizontal centrifuge, and after centrifugal molding, the pipe is pulled out from the socket side by a pipe pulling pliers, similar to CN118808583A, a pipe pulling pliers operation control method for producing super-large diameter ductile iron pipes / CN110538979B, a pipe pulling machine for a centrifugal pipe casting machine, and CN219378917U, a pipe pulling mechanism for a centrifuge, all of which disclose the process or equipment for pulling ductile iron pipes during centrifugal casting.

[0003] However, the inventor discovered in the study of the prior art that, due to the need for mold casting, a sand core needs to be installed on the socket side of the ductile iron pipe. After centrifugal casting, the pipe pulling pliers will penetrate into the inner side of the socket and break the sand core at the end through the expansion action. The broken sand core will fall off naturally during the pipe pulling process. However, it is precisely because of the expansion action of the pipe pulling pliers that a part of the sand core will be compacted to the inner wall of the socket of the ductile iron pipe. If there is no external interference in a short period of time, this part of the 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. In addition, since the cast iron pipe needs to pass through the annealing station before finishing, the annealing station often uses a continuous annealing furnace, and the operation in the annealing furnace uses a chain, and the interior is high temperature and closed. The residual core adhered to the inside of the socket will appear in two states: 1) naturally fall off under the action of high temperature; 2) always adhere to the inner wall to the finishing station. The accumulation of core residues that fall off at the annealing station will have a negative impact on the furnace and is not conducive to the operation of the annealing station.

[0004] Therefore, there is an urgent need for a system for cleaning the residual core of the cast pipe after centrifugal forming and before entering the annealing furnace. Summary of the invention

[0005] In order to overcome the residual core that is relatively firmly adhered to the inner wall of the socket side of the ductile iron pipe during the pipe pulling process and reduce the impact on the annealing furnace, the present invention adopts high-pressure water gun cutting, high-pressure air stripping and blowing to the socket side for discharge, and uses the tubular and closed characteristics of the ductile iron pipe itself to achieve the cleaning of the residual core.

[0006] The technical solution adopted by the present invention is: a cast pipe residual core cleaning system, comprising:

[0007] Cast pipes are ductile iron pipes with sockets that are produced from the centrifugal casting station and transported to the annealing station;

[0008] A supporting and operating part, which supports, rotates and operates the casting pipe to the casting pipe residual core cleaning station;

[0009] Furthermore, it also includes a collecting assembly respectively arranged on both sides of the socket and the spigot of the cast pipe at the cast pipe residual core cleaning station, and the collecting assembly includes:

[0010] Support frame;

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

[0012] A collecting box, which is a box body opened toward the casting pipe side;

[0013] A linear drive drives the collecting box to reciprocate on the movable track so that the socket and the spigot end of the cast pipe enter or move away from the interior of the collecting box;

[0014] A waste suction part, connected to the collection box, sucking the waste collected in the collection box;

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

[0016] The slag cutting part is fixedly connected with the collecting box and moves with the collecting box to cut and peel off the residual core adhered inside the socket section of the casting pipe, blow it to the socket end of the casting pipe and discharge it.

[0017] Furthermore,

[0018] The slag cutting part comprises:

[0019] A slag cutting opening is opened perpendicularly to the inner wall of the socket section of the cast pipe, and a liquid medium is sprayed to cut off and peel off the residual core adhered inside the socket section of the cast pipe;

[0020] The slag blowing port has an opening at an acute angle to the inner wall of the socket section of the cast pipe, and sprays air toward the socket side of the cast pipe to blow the residual core adhered to the inside of the socket section of the cast pipe cut off and peeled off by the slag cutting port to the socket end of the cast pipe.

[0021] Furthermore,

[0022] The slag cutting opening and the slag blowing opening are opened in opposite directions.

[0023] Furthermore,

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

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

[0026] A sedimentation bin is fixedly connected to the support frame, is located at the lower side of the collection assembly when in operation, is communicated with the collection box at the upper part, and is communicated with the waste suction part at the peripheral side;

[0027] Or, it is fixedly connected and communicated with the collection box, and its peripheral side is communicated with the waste suction part.

[0028] Furthermore,

[0029] The lower part of the waste outlet is provided with an openable and closable waste outlet.

[0030] Furthermore,

[0031] When the deposition bin is fixedly connected to the collection box, a diameter-changing portion is provided between the deposition bin and the waste suction portion. The diameter-changing portion is a cone, and the top of the cone is always located inside the waste suction portion when the collection box moves.

[0032] The beneficial effects of the present invention compared with the prior art are: overcoming the prejudice that liquid media (such as water) cannot be used to treat ductile iron pipes between centrifugal and annealing stations, and using high-pressure water and air, combined with dust extraction and external discharge designs, to achieve cleaning of the residual core on the inner wall of the socket. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a front view of a specific embodiment of the present invention (including the perspective view between the collecting box and the casting pipe);

[0034] Figure 2 It is a detailed structural diagram of the collecting assembly of a specific embodiment of the present invention (socket side);

[0035] Figure 3 A top view of a collection assembly according to a specific embodiment of the present invention;

[0036] Figure 4 This is a detailed structural diagram of the slag cutting part of a specific embodiment of the present invention;

[0037] The annotations are:

[0038] 100-casting pipe; 200-supporting operation part;

[0039] 300-support frame; 310-collection box; 311-movable door; 312-movable track; 320-deposition chamber; 321-waste discharge port; 330-linear drive; 340-waste suction part; 341-diameter reducing part;

[0040] 400- slag cutting part; 410- slag cutting port; 420- slag blowing port. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. In the description of the present invention, it should be understood that the orientations or positional relationships indicated by the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0042] In order to overcome the residual core that is relatively firmly adhered to the inner wall of the socket side of the ductile iron pipe during the pipe pulling process and reduce the impact on the annealing furnace, the present invention adopts high-pressure water gun cutting, high-pressure air stripping and blowing to the socket side for discharge, and uses the tubular and closed characteristics of the ductile iron pipe itself to achieve the cleaning of the residual core.

[0043] It should be noted that since the temperature of the cast pipe 100 coming out of the centrifugal station is usually between 600-800 degrees Celsius, and the temperature before entering the push-through station may still be above 500 degrees Celsius, it is not feasible to use liquid media for cleaning in the routine operation of technicians in this field, which will cause a sharp drop in the local temperature and affect the internal quality of the cast pipe. The inventors have found through a large number of experiments that since the thickness of the socket side of the cast pipe is usually much greater than the wall thickness of the pipe body, and after rotating cleaning, it enters the annealing station for heating, it has no obvious effect on the overall quality of the cast pipe. This technical solution overcomes the prejudice of the prior art and realizes water cleaning in specific sections. Please refer to Figures 1 to 4 The technical solution of the specific implementation of the present invention is: a cast pipe residual core cleaning system, comprising:

[0044] The cast pipe 100 is a ductile iron pipe with a socket and a spigot which is produced from a centrifugal casting station and transported to an annealing station;

[0045] The supporting and operating part 200 supports, rotates and operates the casting pipe 100 to the casting pipe residual core cleaning station; generally, the supporting and operating part 200 can be in the form of a supporting wheel, which is transported to this station by stepping or chain, and then the supporting wheel lifts and rotates the casting pipe 100.

[0046] Furthermore, it also includes a collecting assembly provided at the casting pipe residual core cleaning station, at both sides of the socket and the spigot of the casting pipe 100, respectively, and the collecting assembly includes:

[0047] Support frame 300;

[0048] The movable track 312 is a track fixed to the upper part of the support frame 300 and parallel to the axis of the casting pipe 100;

[0049] The collecting box 310 is a box body opened toward the casting pipe 100;

[0050] The linear drive 330 drives the collection box 310 to reciprocate on the movable track 312, so that the socket and the spigot end of the casting pipe 100 enter or move away from the interior of the collection box 310; the linear drive 330 can be driven by a gear rack, or the collection box 310 can be self-powered.

[0051] The waste suction part 340 is connected to the collection box 310 to absorb the waste collected in the collection box 310 ; negative pressure or suction is generated inside the waste suction part 340 to discharge the dust generated during the cleaning process of the residual core in the collection box 310 .

[0052] Furthermore, the collecting assembly located at the socket side of the cast pipe 100 further includes:

[0053] The slag cutting part 400 is fixedly connected to the collecting box 310 and moves with the collecting box 310 to cut and peel off the residual core adhered inside the socket section of the casting pipe 100, blow it to the socket end of the casting pipe 100 and discharge it.

[0054] In some embodiments, preferably, see Figure 4 ,

[0055] The slag cutting part 400 includes:

[0056] The slag cutting opening 410 is opened perpendicularly to the inner wall of the socket section of the cast pipe 100, and a liquid medium is sprayed to cut off and peel off the residual core adhered inside the socket section of the cast pipe 100; the medium is usually water, and it is pressurized water.

[0057] The slag blowing port 420 has an acute angle with the inner wall of the socket section of the casting pipe 100, and sprays air toward the socket side of the casting pipe 100 to blow the residual core adhered inside the socket section of the casting pipe 100 cut and peeled off by the slag cutting port 410 to the socket end of the casting pipe 100. High-pressure air is usually used.

[0058] In some embodiments, see Figure 4 In order to avoid interference between the slag cutting port 410 and the slag blowing port 420 .

[0059] The slag cutting opening 410 and the slag blowing opening 420 open in opposite directions.

[0060] In some embodiments, see Figure 2 and Figure 3 ;

[0061] The linear drive 330 is a cylinder, oil cylinder or electric cylinder fixed on the support frame 300, and the telescopic end is connected to the collection box 310;

[0062] In some embodiments, see Figure 1The collection box 310 and the waste suction unit 340 further include:

[0063] The sedimentation bin 320 is fixedly connected to the support frame 300, is located at the lower side of the collection assembly when in operation, is communicated with the collection box 310 at the upper part, and is communicated with the waste suction part 340 at the peripheral side;

[0064] Or, it is fixedly connected and communicated with the collection box 310, and the peripheral side is communicated with the waste suction part 340; in the present embodiment, there are two technical solutions, one is that the deposition bin 320 is fixedly connected with the support frame 300, and there is a channel on the upper side that can be docked with the collection box 310, and the other is that the deposition bin 320 is fixedly connected with the collection box 310 and moves synchronously with the collection box 310.

[0065] In some other implementations, preferably,

[0066] The lower part of the waste outlet 321 is provided with a waste outlet 321 that can be opened and closed.

[0067] In some embodiments, see Figure 1 and Figure 2 ,

[0068] When the deposition bin 320 is fixedly connected to the collection box 310 , a diameter reducing portion 341 is provided between the deposition bin 320 and the waste suction portion 340 . The diameter reducing portion 341 is a cone, and the top of the cone is always located inside the waste suction portion 340 when the collection box 310 moves.

[0069] In some other embodiments, see Figure 1 The collection assembly may also include an openable and closable lifting door. Since the collection assembly needs to be adapted to cast pipes of a certain specification span, usually DN80-DN350 / DN300-800 / DN900-1200, etc., the collection box 310 in the collection assembly must meet the maximum specification requirements, and there will be a gap on the upper part of the cast pipe 100, causing dust to overflow. In order to overcome the dust overflow, a movable openable and closable lifting door can be used to reduce the dust overflow.

[0070] During the specific operation: the casting pipe 100 moves to this station, the collection assembly is driven by the linear drive 330, the collection box 310 is inserted into the two ends of the socket of the casting pipe 100, the slag cutting part 400 starts to work, the slag cutting port 410 sprays high-pressure water to cut and peel off the residual core adhering to the inner wall of the socket of the casting pipe 100, the slag blowing port 420 peels off the residual core remaining after the slag cutting port 410 cuts, and at the same time, the slag blowing port 420 blows the removed residual core to the socket end, which is captured by the deposition bin 320 on the socket side, and the casting pipe 100 of the supporting operation part 200 is synchronously supported, and the residual core is cleaned when the slag cutting part 400 does not move. Of course, it should be noted that the slag cutting part 400 can also rotate, and the technical solution that supports the operating part 200 while it does not move is also achievable, which should belong to the equivalent conception of the present invention.

[0071] The beneficial effect is: overcoming the prejudice that liquid media (such as water) cannot be used to treat ductile iron pipes between centrifugal and annealing stations, using high-pressure water and air, combined with dust extraction and external discharge designs, to achieve cleaning of the residual core on the inner wall of the socket.

[0072] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A cast pipe residual core cleaning system, characterized in that: include: The cast pipe (100) is a ductile iron pipe having a socket and a spigot which is produced from a centrifugal casting station and transported to an annealing station; A supporting and operating part (200) supports, rotates and operates the casting pipe (100) to the casting pipe residual core cleaning station; Furthermore, it also includes a collecting assembly respectively arranged on both sides of the socket and the spigot of the cast pipe (100) at the cast pipe residual core cleaning station, and the collecting assembly includes: Support frame (300); The movable track (312) is a track fixed on the upper part of the support frame (300) and parallel to the axis of the casting pipe (100); A collecting box (310) is a box body opened toward the casting pipe (100); A linear drive (330) drives the collection box (310) to reciprocate on the movable track (312) so that the socket and the spigot end of the casting pipe (100) enter or move away from the interior of the collection box (310); A waste suction part (340) is connected to the collection box (310) and sucks the waste collected in the collection box (310); Furthermore, the collecting assembly located at the socket side of the casting pipe (100) further comprises: The slag cutting part (400) is fixedly connected to the collecting box (310) and moves with the collecting box (310) to cut off and peel off the residual core adhered inside the socket section of the casting pipe (100), blow it to the socket end of the casting pipe (100) and discharge it.

2. The cast pipe residual core cleaning system according to claim 1, characterized in that: The slag cutting part (400) comprises: A slag cutting opening (410) is opened perpendicularly to the inner wall of the socket section of the casting pipe (100), and a liquid medium is sprayed to cut off and peel off the residual core adhered inside the socket section of the casting pipe (100); The slag blowing port (420) has an opening at an acute angle to the inner wall of the socket section of the casting pipe (100), and sprays air toward the socket side of the casting pipe (100) to blow the residual core adhered to the inside of the socket section of the casting pipe (100) cut off and peeled off by the slag cutting port (410) to the socket end of the casting pipe (100).

3. The cast pipe residual core cleaning system according to claim 2, characterized in that: The slag cutting port (410) and the slag blowing port (420) open in opposite directions.

4. The cast pipe residual core cleaning system according to claim 1, characterized in that: The linear drive (330) is a pneumatic cylinder, an oil cylinder or an electric cylinder fixed on the support frame (300), and the telescopic end of the cylinder is connected to the collection box (310).

5. The cast pipe residual core cleaning system according to claim 1, characterized in that: The collection box (310) and the waste suction unit (340) further include: A sedimentation bin (320) is fixedly connected to the support frame (300), is located at the lower side of the collection assembly when in operation, is communicated with the collection box (310) at the top, and is communicated with the waste suction unit (340) at the circumference; Alternatively, it is fixedly connected to and communicated with the collection box (310), and its peripheral side is communicated with the waste suction part (340).

6. The cast pipe residual core cleaning system according to claim 5, characterized in that: The lower part of the waste outlet (321) is provided with a waste outlet (321) which can be opened and closed.

7. The cast pipe residual core cleaning system according to claim 5, characterized in that: When the deposition bin (320) is fixedly connected to the collection box (310), a diameter-changing portion (341) is further provided between the deposition bin (320) and the waste suction portion (340); the diameter-changing portion (341) is a cone, and when the collection box (310) moves, the top of the cone is always located inside the waste suction portion (340).

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