Centrifugal casting device for ductile cast iron pipe

Abstract

This utility model discloses a centrifugal casting device for ductile iron pipes, relating to the field of centrifugal casting technology. It aims to solve the technical problem of unstable shaking during pipe mold rotation, affecting the stability of the pipe mold during casting. The device includes an outer shell pipe mounted on a base plate and a positioning mechanism mounted on the base plate outside the outer shell pipe. Rotating wheels are rotatably mounted in an array at the upper end of the base plate, with connecting shafts between adjacent rotating wheels. The outer shell pipe is mounted on the rotating wheels. The positioning mechanism includes a positioning plate, with a first fixing rod and a second fixing rod symmetrically mounted at the front end of the positioning plate. A positioning end cap is rotatably mounted at the end of the first fixing rod. This utility model has the advantages of limiting the outer surface and both ends of the outer shell pipe, effectively preventing shaking during rotation, and preventing splashing of molten material, thus improving the safety of the centrifugal casting device operation.

Description

Technical Field

[0001] This utility model relates to the field of centrifugal casting technology, and more specifically, to a centrifugal casting device for ductile iron pipes. Background Technology

[0002] Ductile iron pipes are widely used in water supply, drainage, and gas transmission. Made primarily of ductile iron through centrifugal casting and other processes, they possess advantages such as high strength, good toughness, and strong corrosion resistance. They can withstand high pressure, have a long service life, are easy and quick to install, and offer excellent joint sealing, effectively reducing the risk of leakage and ensuring the safe and stable operation of the transmission system.

[0003] The centrifugal casting device for ductile iron pipes is a key piece of equipment in the ductile iron pipe production process. During the production process, unstable shaking can occur when the pipe mold rotates. When the ductile iron raw material, which is in a high-temperature liquid phase, is poured into the rotating mold tube, splashing of the raw material at the end of the mold tube is very likely to occur. The splashed high-temperature molten metal is extremely dangerous and may seriously threaten the personal safety of the operators, affecting the stability of the pipe mold during the casting process. In view of this, we propose a centrifugal casting device for ductile iron pipes. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the existing technology, adapt to the needs of reality, and provide a centrifugal casting device for ductile iron pipes to solve the technical problem that unstable shaking occurs when the pipe mold rotates, affecting the stability of the pipe mold during the casting process.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a centrifugal casting device for ductile iron pipes, comprising an outer shell tube disposed on a base plate and a positioning mechanism mounted on the base plate outside the outer shell tube. Rotary wheels are rotatably mounted in an array at the upper end of the base plate, and a connecting shaft is provided between adjacent rotary wheels. The outer shell tube is disposed on the rotary wheels, and a mold tube is disposed inside the outer shell tube. Positioning rings are symmetrically arranged on the outer surface of the outer shell tube, and annular grooves are provided on the outer surface of the positioning rings. The positioning mechanism includes a positioning plate, and a first fixing rod and a second fixing rod are symmetrically mounted on the front end of the positioning plate. A positioning end cap is rotatably mounted at the end of the first fixing rod.

[0006] Preferably, a motor is provided on the base plate, a drive pulley is provided at the end of the motor's main shaft, a driven pulley is provided on the connecting shaft, and a transmission belt is provided between the driven pulley and the drive pulley.

[0007] Preferably, a support rod is welded to the lower end of the positioning plate, and a mounting plate is welded to the end of the support rod. The mounting plate is connected to the base plate by bolts.

[0008] Preferably, the positioning plate is semi-circular, located within an annular groove, and has a first ball groove on its inner wall, with a first ball inside the groove, the first ball contacting the inner wall of the annular groove.

[0009] Preferably, a fixing plate is provided at the end of the second fixing rod, and positioning holes are symmetrically provided on the fixing plate. A screw is installed on the side end of the positioning end cover, the screw passes through the positioning hole, and a nut is threaded at the end of the screw.

[0010] Preferably, the positioning end cap includes a limiting part, a closing part, and a variable diameter part. The rear end of the limiting part is provided with a second ball groove, in which a second ball is disposed. The second ball contacts the port of the outer shell tube. The closing part is disposed at the rear end of the limiting part, and the size of the closing part is adapted to the size of the outer shell tube. The variable diameter part is disposed at the end of the closing part, and the variable diameter part is gradually reduced in size. The end of the variable diameter part is bent outward to form a feeding part.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] 1. This utility model designs a positioning plate structure. The positioning plate is semi-circular and located in an annular groove. The first ball bearing contacts the inner wall of the annular groove. This design not only ensures the relative rotational flexibility between the positioning plate and the positioning ring, but also provides good radial positioning for the outer shell tube, reducing the offset caused by centrifugal force. Combined with the positioning end caps to limit the two ends of the outer shell tube, it can effectively prevent the outer shell tube from shaking and solve the problem of unstable shaking that occurs when the current tube mold rotates, which affects the stability of the tube mold during the casting process.

[0013] 2. This utility model also designs a positioning end cap structure. The limiting part of the positioning end cap can limit and fix both ends of the outer shell tube. With the second ball bearing, the outer shell tube can be rotated easily. The closing part of the positioning end cap can effectively seal the port of the outer shell tube. The variable diameter part of the positioning end cap gradually decreases in size and bends outward at the end to form a feeding part. During the rotation of the outer shell tube, the feeding tube can be easily inserted into the feeding part for feeding. At the same time, it can also prevent the added molten raw materials from splashing out, thus improving the safety of operation. Attached Figure Description

[0014] Figure 1 This is a front view structural diagram of the present utility model;

[0015] Figure 2 This is a diagram showing one usage state of the present invention;

[0016] Figure 3 This is a cross-sectional structural diagram of the present invention;

[0017] Figure 4 This is a schematic diagram of the outer shell tube structure of this utility model;

[0018] Figure 5 This is a front view structural diagram of the positioning mechanism of this utility model;

[0019] Figure 6 This is a rear view schematic diagram of the positioning mechanism of this utility model;

[0020] Figure 7 This is a cross-sectional view of the positioning end cap of this utility model.

[0021] The following are the labels in the diagram: 101, base plate; 102, rotating wheel; 103, connecting shaft; 104, outer casing tube; 105, motor; 106, driven pulley; 107, driving pulley; 108, positioning ring; 109, mold tube; 110, annular groove; 200, positioning mechanism; 201, positioning plate; 202, positioning end cover; 2021, limiting part; 2022, closing part; 2023, variable diameter part; 2024, feeding part; 203, first ball bearing; 204, support rod; 205, mounting plate; 206, first fixing rod; 207, second ball bearing; 208, second fixing rod; 209, fixing plate; 210, screw. Detailed Implementation

[0022] like Figures 1 to 7 As shown, the present invention relates to a centrifugal casting device for ductile iron pipes, comprising an outer shell tube 104 disposed on a base plate 101 and a positioning mechanism 200 disposed on the base plate 101 and located outside the outer shell tube 104. Rotary wheels 102 are rotatably mounted on the upper end of the base plate 101, and a connecting shaft 103 is provided between adjacent rotary wheels 102. The outer shell tube 104 is disposed on the rotary wheels 102, and a mold tube 109 is disposed inside the outer shell tube 104. Positioning rings 108 are symmetrically arranged on the outer surface of the outer shell tube 104, and annular grooves 110 are provided on the outer surface of the positioning rings 108. The positioning mechanism 200 includes a positioning plate 201, and a first fixing rod 206 and a second fixing rod 208 are symmetrically mounted on the front end of the positioning plate 201. A positioning end cap 202 is rotatably mounted at the end of the first fixing rod 206. This invention effectively prevents shaking during the rotation of the outer surface of the outer shell tube 104 and at both ends of the outer shell tube 104 by setting limits on the outer surface of the outer shell tube 104 and at both ends of the outer shell tube 104, and also prevents the added molten raw materials from splashing out, thereby improving the safety of the centrifugal casting device operation.

[0023] Specifically, a motor 105 is mounted on the base plate 101, a drive pulley 107 is mounted at the end of the motor 105's main shaft, a driven pulley 106 is mounted on the connecting shaft 103, and a transmission belt is installed between the driven pulley 106 and the drive pulley 107. The operation of the motor 105 causes the drive pulley 107 to rotate, which in turn drives the driven pulley 106 to rotate, thus causing the rotating wheel 102 to rotate. When the rotating wheel 102 rotates, it rubs against the outer surface of the outer casing tube 104, causing the outer casing tube 104 to rotate.

[0024] Furthermore, a support rod 204 is welded to the lower end of the positioning plate 201, and a mounting plate 205 is welded to the end of the support rod 204. The mounting plate 205 is connected to the base plate 101 by bolts. The mounting plate 205 is provided for mounting the positioning plate 201.

[0025] It is worth noting that the positioning plate 201 is semi-circular in shape and located within the annular groove 110. The inner wall of the positioning plate 201 has a first ball groove, within which a first ball 203 is positioned, contacting the inner wall of the annular groove 110. This semi-circular design, with the first ball 203 contacting the inner wall of the annular groove 110, ensures both relative rotational flexibility between the positioning plate 201 and the positioning ring 108, and provides good radial positioning of the outer casing tube 104, reducing displacement caused by centrifugal force. Combined with the positioning end cap 202, which limits the movement of both ends of the outer casing tube 104, this effectively prevents the outer casing tube 104 from shaking.

[0026] It is worth mentioning that a fixing plate 209 is provided at the end of the second fixing rod 208. The fixing plate 209 has symmetrically arranged positioning holes. A screw 210 is installed on the side end of the positioning end cover 202, passing through the positioning holes, and a nut is threaded onto the end of the screw 210. The positioning end cover 202 engages with the positioning holes on the fixing plate 209 via the screw 210 and is secured with a nut. Installation and disassembly are convenient and quick, facilitating operations before and after pouring.

[0027] It is worth noting that the positioning end cap 202 includes a limiting part 2021, a closing part 2022, and a variable diameter part 2023. The rear end of the limiting part 2021 is provided with a second ball groove, in which a second ball 207 is provided. The second ball 207 contacts the port of the outer shell tube 104. The closing part 2022 is located at the rear end of the limiting part 2021. The size of the closing part 2022 is adapted to the size of the outer shell tube 104. The variable diameter part 2023 is located at the end of the closing part 2022. The variable diameter part 2023 is set from large to small. The end of the variable diameter part 2023 bends outward to form a feeding part 2024. The limiting part 2021 of the positioning end cap 202 can limit and fix both ends of the outer shell tube 104. With the second ball bearing 207, the outer shell tube 104 can be rotated easily. The closing part 2022 of the positioning end cap 202 can effectively close the port of the outer shell tube 104. The variable diameter part 2023 of the positioning end cap 202 gradually decreases in size and bends outward at the end to form the feeding part 2024. During the rotation of the outer shell tube 104, the feeding tube can be easily inserted into the feeding part 2024 for feeding. At the same time, it can also prevent the added molten raw materials from splashing out, thus improving the safety of operation.

[0028] Working principle: This embodiment provides a centrifugal casting device for ductile iron pipes. In use, rotating the positioning end cover 202 causes it to fit against the end of the outer casing pipe 104. The screw 210 can be inserted into the positioning hole, and a nut is installed at the end of the screw 210 to fix the positioning end cover 202. The motor 105 rotates the rotating wheel 102, causing the outer casing pipe 104 to rotate. The positioning plate 201 and the positioning ring 108 work together to limit the movement of the outer casing pipe 104. The second ball bearing 207 on 02 can rotate with the outer shell tube 104. The positioning end cap 202 can limit the two ends of the outer shell tube 104. The cooperation of the two can keep the outer shell tube 104 stable during rotation and prevent shaking. During the rotation of the outer shell tube 104, the feed pipe is inserted into the feed part 2024 of the positioning end cap 202, so that the mold tube 109 can be fed. The casting production of ductile iron pipe is completed under the centrifugal force of continuous rotation. When the ductile iron pipe is taken out, one of the positioning end caps 202 can be opened.

[0029] The embodiments disclosed herein are preferred embodiments, but are not limited thereto. Those skilled in the art can readily grasp the spirit of this utility model based on the above embodiments and make different extensions and variations. However, as long as they do not depart from the spirit of this utility model, they are all within the protection scope of this utility model.

Claims

1. A centrifugal casting device for ductile iron pipes, characterized in that, The device includes an outer shell tube (104) mounted on a base plate (101) and a positioning mechanism (200) mounted on the base plate (101) outside the outer shell tube (104). A rotating wheel (102) is rotatably mounted on the upper end of the base plate (101), and a connecting shaft (103) is provided between adjacent rotating wheels (102). The outer shell tube (104) is mounted on the rotating wheel (102), and a mold tube (109) is provided inside the outer shell tube (104). A positioning ring (108) is symmetrically arranged on the outer surface of the outer shell tube (104), and an annular groove (110) is provided on the outer surface of the positioning ring (108). The positioning mechanism (200) includes a positioning plate (201). A first fixing rod (206) and a second fixing rod (208) are symmetrically mounted on the front end of the positioning plate (201), and a positioning end cap (202) is rotatably mounted at the end of the first fixing rod (206).

2. The centrifugal casting device for ductile iron pipes according to claim 1, characterized in that, A motor (105) is provided on the base plate (101), and a drive pulley (107) is provided at the end of the main shaft of the motor (105). A driven pulley (106) is provided on the connecting shaft (103), and a transmission belt is provided between the driven pulley (106) and the drive pulley (107).

3. The centrifugal casting device for ductile iron pipes according to claim 2, characterized in that, A support rod (204) is welded to the lower end of the positioning plate (201), and an mounting plate (205) is welded to the end of the support rod (204). The mounting plate (205) is connected to the base plate (101) by bolts.

4. The centrifugal casting device for ductile iron pipes according to claim 3, characterized in that, The positioning plate (201) is semi-circular and located in the annular groove (110). The inner wall of the positioning plate (201) is provided with a first ball groove, and a first ball (203) is provided in the first ball groove. The first ball (203) is in contact with the inner wall of the annular groove (110).

5. The centrifugal casting device for ductile iron pipes according to claim 4, characterized in that, The second fixing rod (208) is provided with a fixing plate (209) at its end. The fixing plate (209) is provided with symmetrical positioning holes. The positioning end cover (202) is provided with a screw (210) at its side end. The screw (210) passes through the positioning hole and a nut is threaded at the end of the screw (210).

6. The centrifugal casting device for ductile iron pipes according to claim 5, characterized in that, The positioning end cap (202) includes a limiting part (2021), a closing part (2022), and a variable diameter part (2023). The rear end of the limiting part (2021) is provided with a second ball groove, and a second ball (207) is provided in the second ball groove. The second ball (207) contacts the port of the outer shell tube (104). The closing part (2022) is provided at the rear end of the limiting part (2021). The size of the closing part (2022) is adapted to the size of the outer shell tube (104). The variable diameter part (2023) is provided at the end of the closing part (2022). The variable diameter part (2023) is gradually reduced in size. The end of the variable diameter part (2023) is bent outward to form a feeding part (2024).

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