Centrifugal casting device for inner flange metal pipe

Abstract

The utility model discloses a centrifugal casting device for an inner flange metal pipe. The centrifugal casting device comprises a pipe die, a threaded conical brazing block, a resin sand check ring, a pipe die check ring, a resin sand core, a fixed casting launder, a core bar round pipe assembly, a chilling block, a movable casting trolley and a wood three-ply board check ring. The resin sand core, the resin sand check ring and the pipe mold check ring are all arranged between the pipe mold and the wood three-ply board check ring, the resin sand core, the resin sand check ring and the pipe mold check ring are sequentially arranged outwards, the resin sand core is connected with the pipe mold through the threaded conical brazing block, and the movable casting trolley is located on one side of the wood three-ply board check ring. The fixed casting launder is located on the other side of the wood three-ply board check ring, and two molten iron runners A and B are arranged in the launder of the movable casting trolley. According to the utility model, the product quality is improved, the cost is reduced, and the yield is improved; the flange is quickly formed; and the cast pipe does not have a hot crack phenomenon.

Description

Technical Field

[0001] The utility model relates to the technical field of inner flange metal pipe manufacturing devices, in particular to a centrifugal casting device for inner flange metal pipes. Background Art

[0002] At present, most of the equipment for producing flange metal pipes in China adopts sand casting. The metal pipes produced by this equipment have problems such as high deformation, large processing allowance, long production cycle, and high material consumption. Utility Model Content

[0003] The technical problem to be solved by the utility model is to overcome the defects of the above-mentioned technology and provide a centrifugal casting device for an inner flange metal pipe.

[0004] In order to solve the above technical problems, the technical solution provided by the utility model is a centrifugal casting device for an inner flange metal pipe: comprising a pipe mold, a threaded conical brazing block, a resin sand retaining ring, a pipe mold retaining ring, a resin sand core, a fixed casting flow channel, a core bone round tube assembly, a chiller, a movable casting car, and a wooden plywood retaining ring; the resin sand core, the resin sand retaining ring, and the pipe mold retaining ring are all arranged between the pipe mold and the wooden plywood retaining ring, the resin sand core, the resin sand retaining ring, and the pipe mold retaining ring are arranged outward in sequence, the resin sand core is connected to the pipe mold through a threaded conical brazing block, the movable casting car is located on one side of the wooden plywood retaining ring, the fixed casting flow channel is located on the other side of the wooden plywood retaining ring, and two molten iron flow channels A and B are provided in the flow channel of the movable casting car.

[0005] Furthermore, a pipe mold fixing hole is provided on the pipe mold, and a pipe mold fixing pin is provided in the pipe mold fixing hole.

[0006] Furthermore, one end of the movable casting car is provided with a fixed molten iron ladle and left and right movable guide ladles.

[0007] Furthermore, a nut is fixedly connected to the inside of one end of the round tube of the core bone round tube assembly, and a spring washer, a spring, an asbestos gasket, and a threaded conical brazing block are arranged in sequence inside the core bone round tube assembly from the end close to the nut to the other end, and the nut is connected with a bolt.

[0008] The advantages of this utility model compared with the prior art are:

[0009] 1. Changed the old traditional sand casting method, effectively improved product quality, reduced costs and increased output;

[0010] 2. A flange cavity is formed using a resin sand core and fixed with a threaded tapered brazing block. When the pipe mold is just being cast, the spring can firmly connect the brazing block to the pipe mold due to its expansion, and the asbestos gasket can extend the validity period of the spring. The tapered shape allows the incoming molten iron to solidify quickly, interacting with the chilled iron to form a liquid molten iron flange cavity, allowing the flange to be quickly formed.

[0011] 3. Since the brazing block is threaded, its length and diameter are determined by the wall thickness, diameter and flange height of the cast pipe. Therefore, when the molten iron is poured, the external thread will quickly dissolve with the cast pipe, forming a state of external dissolution and internal support.

[0012] 4. Due to the heat preservation effect of the resin sand retaining ring and the second spraying, the molten iron remains liquid, which is conducive to the formation of the flange;

[0013] 5. Excess molten iron flows into the inner cavity of the cast pipe through the overflow port. Since the core bone and chill of the resin sand core are fixed with resin sand, the sand core has a certain degree of yielding, so that the cast pipe will not produce thermal cracking. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The utility model is a structural schematic diagram of a centrifugal casting device for an inner flange metal pipe.

[0015] Figure 2 The utility model is a structural schematic diagram of a device used for manufacturing a resin sand core of a centrifugal casting device for an inner flange metal pipe.

[0016] Figure 3 The utility model is a structural schematic diagram of a centrifugal casting device for an inner flange metal pipe when a core bone round pipe assembly and a chiller are matched.

[0017] Figure 4 The utility model is a structural schematic diagram of a centrifugal casting device for an inner flange metal pipe during installation of a core bone round pipe, a chiller and reinforcing ribs.

[0018] Figure 5 The utility model is a structural schematic diagram of the assembly and fastening of a resin sand core of a centrifugal casting device for an inner flange metal pipe.

[0019] Figure 6 The utility model is a structural schematic diagram of a resin sand core box and a resin sand retaining ring core box of a centrifugal casting device for an inner flange metal pipe.

[0020] Figure 7 The utility model is a schematic diagram of the installation of a resin sand core of a centrifugal casting device for an inner flange metal pipe.

[0021] Figure 8The utility model is a schematic diagram of the installation and positioning of a resin sand core of a centrifugal casting device for an inner flange metal pipe.

[0022] As shown in the figure:

[0023] 1. Pipe mold, 2. Pipe mold fixing hole, 3. Threaded tapered brazing block, 4. Resin sand retaining ring, 5. Pipe mold retaining ring, 6. Resin sand core, 7. Fixed casting flow channel, 8. Pipe mold fixing pin, 9. Molten iron fixed ladle, 10. Left and right movable guide ladle, 11. Core bone round tube assembly, 12. Chill, 13. Asbestos gasket, 14. Spring, 15. Spring washer, 16. Nut, 17. Bolt one, 18. Bolt two, 19. Overflow hole model rod, 20. Resin sand core box, 21. Resin sand retaining ring core box, 22. Movable casting cart, 23. Bolt three, 24. Wooden plywood retaining ring. DETAILED DESCRIPTION

[0024] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0025] Example 1, combined with the attached Figure 1-8 A centrifugal casting device for an inner flange metal pipe comprises a pipe mold 1, a threaded tapered brazing block 3, a resin sand retaining ring 4, a pipe mold retaining ring 5, a resin sand core 6, a fixed casting flow channel 7, a core bone round tube assembly 11, a cold iron 12, a movable casting car 22, and a wooden plywood retaining ring 24; the resin sand core 6, the resin sand retaining ring 4, and the pipe mold retaining ring 5 are all arranged between the pipe mold 1 and the wooden plywood retaining ring 24, the resin sand core 6, the resin sand retaining ring 4, and the pipe mold retaining ring 5 are arranged outward in sequence, the resin sand core 6 is connected to the pipe mold 1 through a threaded tapered brazing block 3, the movable casting car 22 is located on one side of the wooden plywood retaining ring 24, the fixed casting flow channel 7 is located on the other side of the wooden plywood retaining ring 24, and two molten iron flow channels A and B are provided in the flow channel of the movable casting car 22.

[0026] The pipe mold 1 is provided with a pipe mold fixing hole 2, and a pipe mold fixing pin 8 is provided in the pipe mold fixing hole 2.

[0027] One end of the movable casting car is provided with a fixed molten iron ladle 9 and left and right movable guide ladles 10.

[0028] A nut 16 is fixedly connected to the inside of one end of the round tube of the core bone round tube assembly 11, and a spring washer 15, a spring 14, an asbestos gasket 13, and a threaded tapered brazing block 3 are arranged in sequence inside the core bone round tube assembly 11 from the end close to the nut 16 to the other end, and the nut 16 is connected with a bolt 17.

[0029] When implementing it, follow these steps:

[0030] Step 1: Making resin sand core

[0031] a. Place the resin sand core box on the vibration platform and align the three oil top holes with the oil top;

[0032] b. With an iron tube, a nut 16 is welded to the inner wall at one end, a piece of iron plate is welded at each end, and holes are punched up and down to form a core bone tube assembly 11;

[0033] c. Making a chill 12 and welding a plurality of connecting bars on it;

[0034] d. Make a threaded tapered brazing block 3. Its diameter, length and number on each resin sand core are determined according to the diameter and wall thickness of the cast pipe. An asbestos gasket 13, a spring 14 and a spring washer 15 are arranged in sequence between the threaded tapered brazing block 3 and the nut 16. A bolt 17 is screwed onto the nut 16. Figure 2 ;

[0035] e. Insert the chill 12 into one end of the core bone round tube assembly 11, place multiple chills 12 into the resin sand core box 20 in sequence, and fix them to the resin sand core box 20 in sequence with the second bolt 18. Then, string the reinforcement ribs into the holes of the iron block and tighten them, and then connect them to the reinforcement ribs on the chill 12. After the connection is completed, put the overflow hole model rod 19, pour the resin sand into the resin sand core box 20 and vibrate it. After the completion, loosen the second bolt 18 and pull it out, push it out with an oil jack, apply refractory paint on the chill surface and flange surface of the sand core, and then perform dynamic balancing correction; see attached. Figure 3 , Attachment Figure 4 .

[0036] Step 2:

[0037] Use resin sand retaining ring core box 21 to make resin sand retaining ring 4 with the same outer diameter and inner diameter as pipe mold baffle 5, and apply refractory paint on the flange surface after it is done. Figure 6 .

[0038] Step 3:

[0039] 1. Make a fixed casting chute 7 and a movable casting car 22;

[0040] 2. A fixed molten iron ladle 9 and left and right movable guide ladles 10 are provided on the movable casting car 22, and two molten iron flow channels A and B are provided in the chute.

[0041] Step 4: Installation of resin sand core and resin sand retaining ring

[0042] a. First, screw the bolt 17 into the nut 16, then sequentially place the spring washer 15, spring 14, and asbestos washer 13 into the core bone round tube assembly 11. Finally, place the threaded tapered brazing block 3, which has been pickled and coated with brazing agent, into the area flush with the round tube diameter and secure it with a weak adhesive to prevent it from falling off during installation.

[0043] b. Hang the resin sand core into the pipe mold 1, then put the positioning blocks C and D into the pipe mold 1, fix the position, and place the sand core on the positioning blocks C and D. After placing them, place the positioning block E on the sand core; see Figure 7 、 Figure 8 ;

[0044] c. After the sand core is placed, use bolt 3 23 to adjust it so that the sand core and the pipe mold 1 are concentric. Then tighten bolt 17 step by step and symmetrically to fix the sand core firmly in the pipe mold 1. Then loosen bolt 3 23 and pull it out. Then nail the wooden plywood retaining ring 24 to the sand core. Repeat the same process on both sides. See attached. Figure 5 ;

[0045] d. Place the resin sand retaining ring 4 and the pipe mold retaining ring 5 into the pipe mold 1 in sequence, and insert the pipe mold fixing pin 8 into the pipe mold fixing hole 2 and tighten it. Repeat the same process on both sides.

[0046] e. Then rotate the pipe mold 1 and spray the flange cavity for the second time. Due to the obstruction of the wooden plywood retaining ring 24, the paint can be prevented from being sprayed onto the threaded tapered brazing block 3, affecting the dissolution of the threaded tapered brazing block 3.

[0047] Step 5: Casting of cast pipe

[0048] a. Place the fixed casting trough 7 in front of the pipe mold 1 so that the casting port is vertically aligned with the pipe mold flange cavity;

[0049] b. When the speed reaches the specified value, the movable casting car 22 starts casting using the flow channel A in the chute. At the same time, the fixed molten iron ladle 9 also casts at a small flow rate. Due to the rapid cooling of the chill 12 and the threaded tapered brazing block 3, and the secondary spraying of the thermal insulation coating on the flange cavity, the sand core solidifies quickly, forming a flange high-temperature molten iron cavity. After the flange is formed, the excess molten iron flows from the overflow port to the inner cavity of the cast pipe;

[0050] c. When the movable casting car 22 retreats to the rear of the pipe mold 1 and the runner B is aligned with the flange cavity, stop the movable casting car 22 and quickly push the left and right movable guide ladles 10 to cast the two runners A and B simultaneously. The distance between the runners A and B depends on the retreat speed of the movable casting car 22, the flow rate and flow rate of the molten iron. Similarly, after the flange is formed, the excess molten iron flows into the cast pipe from the overflow port. To reduce the deformation of the cast pipe, the cast pipe temperature is lowered to 200-180 degrees. Then the pipe mold 1 stops rotating, the fixed casting trough 7 is pulled away, and the cast pipe is pulled out. See attached. Figure 1 .

[0051] In the description of the embodiments of the present invention, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the product of the utility model is usually placed when in use. It is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it should not be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and should not be understood as indicating or implying relative importance.

[0052] Furthermore, the use of terms such as "horizontal," "vertical," and "overhanging" does not necessarily imply that the component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," not that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0053] In the description of the embodiments of the present invention, “a plurality of” means at least 2.

[0054] In the description of the embodiments of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0055] The above description of the present invention and its embodiments is non-limiting. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if a person skilled in the art is inspired by the above, and does not deviate from the purpose of the present invention, without inventive design, a structure and embodiment similar to the technical solution should fall within the scope of protection of the present invention.

Claims

1. A centrifugal casting device for an inner flange metal pipe, characterized in that: It includes a pipe mold, a threaded tapered brazing block, a resin sand retaining ring, a pipe mold retaining ring, a resin sand core, a fixed casting flow trough, a core bone round tube assembly, a chiller, a movable casting car, and a wooden plywood retaining ring; The resin sand core, resin sand retaining ring, and tube mold retaining ring are all arranged between the tube mold and the wooden plywood retaining ring. The resin sand core, resin sand retaining ring, and tube mold retaining ring are arranged outward in sequence. The resin sand core is connected to the tube mold through a threaded tapered brazing block. The movable casting car is located on one side of the wooden plywood retaining ring, and the fixed casting flow channel is located on the other side of the wooden plywood retaining ring. Two molten iron flow channels A and B are provided in the flow channel of the movable casting car.

2. The centrifugal casting device for an inner flange metal pipe according to claim 1, characterized in that: A pipe mold fixing hole is provided on the pipe mold, and a pipe mold fixing pin is provided in the pipe mold fixing hole.

3. The centrifugal casting device for an inner flange metal pipe according to claim 1, characterized in that: One end of the movable casting car is provided with a fixed molten iron ladle and left and right movable guide ladles.

4. The centrifugal casting device for an inner flange metal pipe according to claim 1, characterized in that: A nut is fixedly connected to the inside of one end of the round tube of the core bone round tube assembly, and a spring washer, a spring, an asbestos gasket, and a threaded tapered brazing block are arranged in sequence inside the core bone round tube assembly from the end close to the nut to the other end, and the nut is connected with a bolt.

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