Split bolt fixing type molten iron ladle trunnion block ring and trunnion assembly

Abstract

This utility model discloses a split-bolt fixed trunnion retaining ring and trunnion assembly for molten iron ladles. The trunnion retaining ring includes a pair of mating trunnion retaining ring bodies. One end of the outer circumference of the trunnion retaining ring body has an inwardly recessed countersunk area with a plurality of radial countersunk holes distributed within it. The other end of the outer circumference of the trunnion retaining ring body has a circumferentially extending through-hole area with a plurality of radial through holes distributed within it. When the pair of trunnion retaining ring bodies are connected, the through-hole area corresponds to the countersunk area, and the radial through holes correspond to the radial countersunk holes. An arc-shaped retaining ring sleeve extends outward along the end face of the trunnion retaining ring, so that the inner circumference of the trunnion retaining ring body forms an arc-shaped protrusion. The trunnion assembly includes a trunnion, one end of which has a working journal. A trunnion bushing is fitted on the working journal, and a trunnion retaining ring is connected near the end of the working journal. The end face of the trunnion retaining ring abuts against the end face of the trunnion bushing. This utility model can avoid the influence of welding process on the trunnion and extend the service life of the trunnion retaining ring.

Description

Technical Field

[0001] This utility model relates to the field of metallurgical equipment, specifically to a retaining ring structure for axial positioning of the trunnion bushing of the molten iron ladle in a casting machine, which is particularly suitable for working conditions where the bushing needs to be replaced. Background Technology

[0002] In the casting machine operation of the metallurgical industry, the trunnion of the molten iron ladle is a key load-bearing component that supports the weight of the ladle and the molten iron. The trunnion bushing, fitted onto the trunnion, serves to reduce friction and protect the trunnion body. Traditionally, the axial position of the trunnion bushing is fixed by welding retaining rings or baffles. This method has significant drawbacks: the high-temperature heat input generated during welding creates a heat-affected zone in the trunnion base material, potentially leading to changes in the local metallographic structure, decreased hardness, residual stress, and even microcracks, seriously threatening the structural integrity and load-bearing safety of the trunnion and shortening its service life. Furthermore, replacing the welded retaining ring requires cutting and re-welding, a complex and time-consuming process that prolongs equipment downtime for maintenance, impacting production efficiency. Additionally, some existing split-type trunnion retaining rings or baffles have unreasonable connection methods, resulting in weak connections or, under repeated loads, severely shortening the service life of the retaining ring and threatening the fixation of the trunnion bushing. Summary of the Invention

[0003] The purpose of this invention is to address the problems existing in the prior art by providing a cast iron ladle trunnion retaining ring that has a reasonable structure, is easy to assemble and disassemble, and causes no thermal damage to the trunnion body.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A split-type bolt-fixed trunnion retaining ring for molten iron ladles, comprising a pair of mating trunnion retaining ring bodies. One end of the outer circumference of each trunnion retaining ring body has an inwardly recessed countersunk area containing a plurality of radial countersunk holes. The other end of the outer circumference of each trunnion retaining ring body has a circumferentially extending through-hole area containing a plurality of radial through-holes. When a pair of trunnion retaining ring bodies are connected, the through-hole area mates with the countersunk area, and the radial countersunk holes correspond to the radial through-holes. An arc-shaped retaining ring sleeve extends outward along the end face of each trunnion retaining ring body, forming an arc-shaped protrusion on the inner circumference of the trunnion retaining ring body.

[0005] The trunnion retaining ring comprises a pair of mating trunnion retaining ring bodies. When the trunnion bushing needs to be replaced due to wear, only the fixing bolts need to be removed, and then the old trunnion bushing can be easily removed and the new trunnion bushing installed. This process does not require hot work (cutting, welding). Secondly, several bolt positions on the trunnion retaining ring are located on one side of the connection between the two trunnion retaining ring bodies. The advantage of this is that the lateral load applied at the connection is to the bolt shank, which is balanced by several bolt shanks, preventing the bolt nuts or caps from bearing dynamic loads, thus avoiding loosening or damage. In addition, the trunnion retaining ring has an arc-shaped retaining ring sleeve extending outward along the end face, so that the inner circumference of the trunnion retaining ring body forms an arc-shaped protrusion, which plays a role in preventing axial movement of the trunnion bushing and positioning the trunnion retaining ring during installation.

[0006] Preferably, the radial through hole is threaded, the radial countersunk hole is threaded into a hole corresponding to the radial through hole, a bolt is screwed into the radial countersunk hole and the radial through hole, the bottom of the bolt is screwed into the threaded hole, and the head of the bolt is recessed into the radial through hole.

[0007] The bolt is screwed into the threaded hole of the radial countersunk hole through the radial through hole, and a preload is applied to the bolt so that the two mating trunnion retaining ring bodies are installed and fixed, and the trunnion retaining rings are axially clamped and fixed in the annular groove position of the trunnion body; the bolt head is recessed into the radial through hole to avoid external interference.

[0008] Preferably, the radial recess thickness of the countersunk hole region is equal to the radial thickness of the through hole region.

[0009] The countersunk hole area is adapted to the through hole area, which facilitates the connection and mating of the two trunnion bodies.

[0010] Preferably, the countersunk hole area has two radial countersunk holes, and the through hole area has two radial through holes.

[0011] High-strength bolts are installed in the two radial countersunk holes and the radial through holes to share the dynamic load from the connection between the two retaining ring bodies.

[0012] Preferably, the present invention also includes a trunnion assembly for a split bolt-fixed trunnion retaining ring of a molten iron ladle. The trunnion assembly includes a trunnion, one end of which is provided with a working journal, and a trunnion bushing is fitted on the working journal. The trunnion retaining ring is connected to the working journal near its end, and the end face of the trunnion retaining ring abuts against the end face of the trunnion bushing.

[0013] The trunnion bushing is fitted onto the working journal, and the end face of the trunnion retaining ring is in close contact with the end face of the trunnion bushing. The trunnion retaining ring can restrict the axial movement of the trunnion bushing. As a wear part, the trunnion bushing often needs to be replaced. When replacing it, the fixing bolts on the trunnion retaining ring are removed, and the trunnion retaining rings on both sides can be easily removed. After replacement, the trunnion retaining rings are reinstalled and the bolts are tightened. No cutting or welding or other hot work is required, which greatly simplifies the operation process, significantly shortens the maintenance time, and the simplified disassembly and installation steps greatly reduce equipment downtime for maintenance, thereby improving the equipment utilization rate and production efficiency of the cast iron machine production line.

[0014] Preferably, the diameter of the working journal is smaller than the diameter of the trunnion, the inner diameter of the trunnion bushing is smaller than the outer diameter of the trunnion, and the outer diameter of the trunnion bushing is larger than the outer diameter of the trunnion.

[0015] The diameter of the working journal is smaller than the diameter of the trunnion, the inner diameter of the trunnion bushing is smaller than the outer diameter of the trunnion, and the outer diameter of the trunnion bushing is larger than the outer diameter of the trunnion. This can restrict the trunnion bushing from moving towards the trunnion side and further fix the trunnion bushing.

[0016] Preferably, the outer periphery of the working journal is provided with an annular groove near the end, the arc-shaped protrusion is disposed in the annular groove, and the retaining ring is sleeved on the outer periphery end of the working journal.

[0017] The arc-shaped protrusion is provided in the annular groove, which can restrict the axial movement of the trunnion bushing and achieve zero axial displacement constraint. At the same time, the annular groove also plays a positioning role when the trunnion retaining ring is installed. The retaining ring is sleeved on the outer peripheral end of the working journal, which can prevent the arc-shaped protrusion from not being fully engaged in the annular groove when the trunnion retaining ring is assembled.

[0018] Preferably, the axial width of the retaining ring sleeve is equal to the axial width of the outer peripheral end of the working journal.

[0019] The retaining ring sleeve fits tightly against the outer peripheral end of the working journal, further ensuring that the trunnion retaining ring is securely installed.

[0020] Compared with the prior art, the beneficial effects of this utility model are: 1. The split bolt-fixed trunnion retaining ring and trunnion assembly of this utility model completely eliminate the influence of welding. The trunnion retaining ring is fixed by mechanical bolt connection, which completely avoids the risks of heat-affected zone (HAZ), metallographic structure deterioration, residual stress and potential cracks caused by high welding temperature to the trunnion body material. It fundamentally ensures the structural strength and service life of the trunnion, improves the safety and reliability of the molten iron ladle operation, reduces maintenance costs, protects the expensive trunnion body, extends its replacement cycle, reduces welding-related labor, equipment and energy costs, shortens downtime, and brings significant economic benefits. 2. The arc-shaped protrusion on the trunnion retaining ring and the annular groove on the trunnion can provide precise axial and circumferential positioning. Multiple high-strength bolts provide uniform and reliable axial clamping force, ensuring that the trunnion retaining ring is stable and reliable during the operation of the molten iron ladle (including tilting and vibration), and effectively preventing the trunnion bushing from moving. 3. Several bolts on the trunnion retaining ring are positioned on one side of the connection between the two trunnion bodies. The dynamic load is directly applied to the bolt threads and is distributed and balanced by several bolts, which can prevent the nuts and nuts from loosening or being damaged by force, and further extend the service life of the trunnion retaining ring. 4. The trunnion bushing adopts a split annular structure on both sides of the trunnion retaining ring, which is circumferentially fixed by high-strength bolts. When the trunnion bushing is worn and replaced, the retaining rings on both sides can be removed after the fixing bolts are removed to replace the new bushing. No cutting or welding or other hot work is required, which greatly simplifies the installation process. Attached Figure Description

[0021] Figure 1 This is an isometric drawing of the trunnion retaining ring of this utility model; Figure 2 This is a schematic diagram of the overall assembly of the trunnion retaining ring of this utility model; Figure 3 This is a schematic diagram of the trunnion structure of this utility model; In the figure: 1. Trunnion; 101. Working journal; 102. Annular groove; 2. Trunnion bushing; 3. Trunnion retaining ring; 301. Trunnion retaining ring body; 302. Countersunk hole area; 303. Through hole area; 304. Arc-shaped protrusion; 305. Retaining ring sleeve. Detailed Implementation

[0022] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0023] The specific embodiments of this utility model adopt the following technical solutions, which will be further described below with reference to the accompanying drawings: A split-bolt-fixed trunnion retaining ring for molten iron ladles, comprising a pair of mating trunnion retaining ring bodies 301. One end of the outer circumference of each trunnion retaining ring body 301 has an inwardly recessed countersunk area 302, within which several radial countersunk holes are distributed. The other end of the outer circumference of each trunnion retaining ring body has a circumferentially extending through-hole area 303, within which several radial through-holes are distributed. When a pair of trunnion retaining ring bodies 301 are connected, the through-hole area 303 matches the countersunk area 302, and the radial countersunk holes correspond to the radial through-holes. The trunnion retaining ring 3 has an arc-shaped retaining ring sleeve 305 extending outward along its end face, so that an arc-shaped protrusion 304 is formed on the inner circumference of the trunnion retaining ring body 301.

[0024] The trunnion retaining ring includes a pair of mating trunnion retaining ring bodies 301. When the trunnion bushing 2 needs to be replaced due to wear, only the fixing bolts need to be removed, and then the old trunnion bushing can be easily removed and the new trunnion bushing installed. This process does not require hot work (cutting, welding). Secondly, several bolt positions on the trunnion retaining ring 3 are located on one side of the connection between the two trunnion retaining ring bodies 301. The advantage of this is that the lateral load applied at the connection is to the bolt shank, which is balanced by several bolt shanks, avoiding the bolt nuts or caps from bearing dynamic loads, thus preventing loosening or damage. In addition, the trunnion retaining ring 3 has an arc-shaped retaining ring sleeve 305 extending outward along the end face, so that the inner circumference of the trunnion retaining ring body 301 forms an arc-shaped protrusion 304, which plays a role in preventing axial movement of the trunnion bushing 2 and positioning the trunnion retaining ring 3 during installation.

[0025] Preferably, the radial through hole is threaded, and the radial countersunk hole is threaded with a corresponding threaded hole. A bolt is screwed into the radial countersunk hole and the radial through hole, with the bottom of the bolt screwed into the threaded hole and the head of the bolt recessed into the radial through hole. The threaded hole has a size of M20×2.5 and a depth of 30mm. The bolt is a high-strength bolt, grade 12.9, with a specification of M20×80.

[0026] The bolt passes through the radial through hole and is screwed into the threaded hole of the radial countersunk hole, applying a preload to the bolt. This secures the two mating trunnion retainer bodies 301, axially clamping and fixing the trunnion retainer 3 to the annular groove position on the trunnion 1. The bolt head is recessed into the radial through hole to avoid external interference. The high-strength bolt and the threaded hole engagement portion are coated with a high-temperature thread-locking agent. This agent further ensures the stability between the trunnion retainer 3, the trunnion bushing 2, and the molten iron pot, preventing the bolt from loosening under long-term load.

[0027] Preferably, the radial recess thickness of the countersunk hole region 302 is equal to the radial thickness of the through hole region 303.

[0028] The countersunk hole area 302 is adapted to the through hole area 303, which facilitates the connection and cooperation of the two trunnion retaining ring bodies 301.

[0029] Preferably, the countersunk hole area 302 is provided with two radial countersunk holes, and the through hole area 303 is provided with two radial through holes; the two radial through holes have a size of Φ22mm and a depth of 35mm.

[0030] High-strength bolts are installed in the two radial countersunk holes and the radial through holes to share the dynamic load from the connection between the two retaining ring bodies.

[0031] Preferably, the present invention also includes a trunnion assembly for a split bolt-fixed trunnion retaining ring of a molten iron ladle. The trunnion assembly includes a trunnion 1, one end of which is provided with a working journal 101. A trunnion bushing 2 is fitted on the working journal 101. The trunnion retaining ring 3 is connected to the working journal 101 near its end, and the end face of the trunnion retaining ring 3 abuts against the end face of the trunnion bushing 2.

[0032] The trunnion bushing 2 is fitted onto the working journal 101. The end face of the trunnion retaining ring 3 is in close contact with the end face of the trunnion bushing 2, and the trunnion retaining ring 3 can restrict the axial movement of the trunnion bushing 2. As a wear part, the trunnion bushing 2 often needs to be replaced. When replacing, the fixing bolts on the trunnion retaining ring 3 are removed, and the trunnion retaining rings 3 on both sides can be easily removed. After replacement, the trunnion retaining ring 3 is reinstalled and the bolts are tightened. No cutting or welding or other hot work is required, which greatly simplifies the operation process, significantly shortens the maintenance time, and the simplified disassembly and installation steps greatly reduce the equipment downtime for maintenance, thereby improving the equipment utilization rate and production efficiency of the cast iron machine production line.

[0033] Preferably, the diameter of the working journal 101 is smaller than the diameter of the trunnion 1, the inner diameter of the trunnion bushing 2 is smaller than the outer diameter of the trunnion 1, and the outer diameter of the trunnion bushing 2 is larger than the outer diameter of the trunnion 1.

[0034] The diameter of the working journal 101 is smaller than the diameter of the trunnion 1, the inner diameter of the trunnion bushing 2 is smaller than the outer diameter of the trunnion 1, and the outer diameter of the trunnion bushing 2 is larger than the outer diameter of the trunnion 1. This can restrict the trunnion bushing 2 from moving towards the trunnion side and further fix the trunnion bushing 2.

[0035] Preferably, the outer periphery of the working journal 101 near the end is provided with an annular groove 102, the arc-shaped protrusion 304 is disposed in the annular groove 102, and the retaining ring sleeve 305 is sleeved on the outer periphery end of the working journal 101.

[0036] The arc-shaped protrusion 304 is disposed in the annular groove 102, which can restrict the axial movement of the trunnion bushing 2 and achieve axial zero displacement constraint. At the same time, the annular groove 102 also plays a positioning role when the trunnion retaining ring 3 is installed. The retaining ring sleeve 305 is sleeved on the outer peripheral end of the working journal 101 to prevent the arc-shaped protrusion from not being fully inserted into the annular groove when the trunnion retaining ring 3 is assembled.

[0037] Preferably, the axial width of the retaining ring sleeve 305 is equal to the axial width of the outer peripheral end of the working journal 101.

[0038] The retaining ring sleeve 305 fits tightly against the outer peripheral end of the working journal 101, further ensuring that the trunnion retaining ring 3 is installed securely.

[0039] Trunnion 1 is forged from 42CrMo alloy steel and fixedly welded to both sides of the molten iron ladle. The working journal diameter is Φ270mm and the surface hardening hardness is HRC45-50.

[0040] Trunnion assembly and fixing process: Step 1: Cover the trunnion 1 with the two trunnion retaining rings 3 so that the annular groove 5 fits into the arc protrusion 304. After positioning by the arc protrusion 304, tighten it with a temporary clamp. Step 2: Use 12.9 grade high strength bolts (size M20×80) to pass through the radial through holes in sequence and screw them into the threaded holes inside the radial countersunk holes; use a torque wrench to tighten diagonally to ensure that the bolt heads are completely recessed into the radial through holes; apply high temperature thread locking agent to the threaded engagement part to prevent loosening.

[0041] Procedure for replacing trunnion bushing 2: Step 1: Remove the trunnion retaining ring 3. The specific operation method is to loosen all the bolts and remove the two pairs of trunnion retaining ring bodies 301. Step 2: Replace the trunnion bushing 2. The specific operation method is to lift out the worn trunnion bushing 2 and press in the new trunnion bushing. Step 3: Reset the trunnion retaining ring 3. The specific operation method is to reinstall the trunnion retaining ring 3 and tighten the bolts as in Step 2.

[0042] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A split bolted type trunnion ring for a ladle, characterized by, The trunnion retaining ring (3) includes a pair of mating trunnion retaining ring bodies (301). One end of the outer circumference of the trunnion retaining ring body (301) is provided with an inwardly recessed countersunk area (302), and a plurality of radial countersunk holes are distributed in the countersunk area (302). The other end of the outer circumference of the trunnion retaining ring body is provided with a circumferentially extending through-hole area (303), and a plurality of radial through-holes are distributed in the through-hole area (303). When a pair of trunnion retaining ring bodies (301) are connected, the through-hole area (303) is adapted to the countersunk area (302), and the radial countersunk holes correspond to the radial through-holes. The trunnion retaining ring (3) has an arc-shaped retaining ring sleeve (305) extending outward along the end face, so that the inner circumference of the trunnion retaining ring body (301) forms an arc-shaped protrusion (304).

2. The split bolted type trunnion ring for a ladle according to claim 1, wherein The radial through hole is threaded, and the radial countersunk hole is threaded to correspond to the radial through hole. A bolt is screwed into the radial countersunk hole and the radial through hole, with the bottom of the bolt screwed into the threaded hole and the head of the bolt recessed into the radial through hole.

3. The split bolted type trunnion ring for a ladle according to claim 1, wherein The radial recess thickness of the countersunk area (302) is equal to the radial thickness of the through-hole area (303).

4. The split bolted type trunnion ring for a ladle according to claim 1, wherein The countersunk hole area (302) is provided with two radial countersunk holes, and the through hole area (303) is provided with two radial through holes.

5. A split bolted ladle trunnion assembly using a split bolted ladle trunnion retainer ring as claimed in any one of claims 1 to 4, characterised in that, The trunnion assembly includes a trunnion (1), one end of which is provided with a working journal (101), and a trunnion bushing (2) is fitted on the working journal (101). The working journal (101) is connected to the trunnion retaining ring (3) near its end, and the end face of the trunnion retaining ring (3) abuts against the end face of the trunnion bushing (2).

6. A split bolted type ladle trunnion assembly as claimed in claim 5 wherein, The diameter of the working journal (101) is smaller than the diameter of the trunnion (1), the inner diameter of the trunnion bushing (2) is smaller than the outer diameter of the trunnion (1), and the outer diameter of the trunnion bushing (2) is larger than the outer diameter of the trunnion (1).

7. A split bolted type ladle trunnion assembly as claimed in claim 5 wherein, The working journal (101) has an annular groove (102) near its end on its outer periphery, the arc-shaped protrusion (304) is disposed in the annular groove (102), and the retaining ring sleeve (305) is sleeved on the outer periphery end of the working journal (101).

8. A split bolted type ladle trunnion assembly as claimed in claim 7 wherein, The axial width of the retaining ring sleeve (305) is equal to the axial width of the outer peripheral end of the working journal (101).

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