Finishing mill inlet side middle guide plate convenient to replace quickly

Abstract

The utility model discloses a finishing mill inlet side middle guide plate convenient to replace quickly, which belongs to the technical field of finishing mill side guide plates and comprises a guide plate body. A plurality of groups of bolt holes penetrating through the upper surface and the lower surface of the body are formed in the body, the bolt holes comprise two bolt holes, each bolt hole comprises a countersunk bolt cap hole with the diameter being R and a countersunk bolt rod hole with the diameter being r, and the countersunk bolt cap hole and the countersunk bolt rod hole of each bolt hole are in a coaxial relation Rgt; r; the countersunk bolt cap hole is positioned above the countersunk bolt rod hole; an inner hexagon bolt is arranged in the bolt hole, a bolt cap of the inner hexagon bolt is located in the countersunk bolt cap hole, a bolt rod of the inner hexagon bolt is located in the countersunk bolt rod hole, and the diameter of the bolt cap is D and Rgt; dgt; r; the height of the countersunk bolt cap head hole is not less than that of the bolt cap; the diameters of the bolt rods are d and dlt; r, the length of the bolt bar is larger than the height of the countersunk bolt bar hole; the utility model solves the problem that the middle guide plate tilts.

Description

Technical Field

[0001] The utility model belongs to the technical field of side guide plates of a finishing mill, in particular to an intermediate guide plate at an inlet side of a finishing mill which is convenient for rapid replacement. Background Art

[0002] The finishing mill is a key piece of equipment in a hot strip production line, primarily used to further roll rough-rolled strip to the desired thickness and width. The finishing side guide is an essential auxiliary tool installed at the mill entrance. It guides and controls the strip's rolling direction in the finishing mill, ensuring optimal rolling results. It is an essential component in the rolling process.

[0003] Currently, the middle guide plate of the finishing mill side guide is fixed to the center of the mill guide plate using a wire connection method from bottom to top. This connection method ensures that the strip is rolled in a certain order and in the correct state between the rollers, reducing rollover accidents and ensuring personal and equipment safety.

[0004] However, the middle guide plate is connected and fixed from bottom to top by fixing screws using planting wire. In a high-temperature vibration environment, the middle guide plate fixing screws of the rolling mill side guide plate will be stretched and deformed, causing the middle guide plate to tilt, affecting the transportation of strip steel and easily leading to steel piling accidents; and the installation position of the middle guide plate is concealed and the working space is small, resulting in difficulty in replacement and installation; due to the difficulty in replacement and installation, it can only be replaced when the machine is shut down for a long time for maintenance, resulting in the finishing mill having to operate with the problem, posing a safety hazard to the equipment. Utility Model Content

[0005] The purpose of the present utility model is to provide an intermediate guide plate on the inlet side of a finishing mill that is easy to replace quickly, so as to solve the technical problems raised in the above-mentioned background technology that the intermediate guide plate fixing screws of the finishing mill side guide plate are easily elongated and deformed under a high-temperature vibration environment, causing the intermediate guide plate to tilt, and the original wire-planting connection method adopts bottom-up fixing, concealed installation position, and narrow working space, which makes replacement and maintenance difficult.

[0006] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0007] An intermediate guide plate at the inlet side of a finishing mill that is easy to replace quickly, comprising:

[0008] It includes a guide plate body; several groups of bolt holes penetrating the upper and lower surfaces of the guide plate body are provided on the guide plate body. Each group of bolt holes includes two bolt holes. Each bolt hole includes a countersunk bolt head hole with a diameter of R and a countersunk bolt shank hole with a diameter of r. The countersunk bolt head hole and the countersunk bolt shank hole of each bolt hole are coaxial, and R>r; the countersunk bolt head hole is located above the countersunk bolt shank hole; an internal hexagon bolt is arranged in the bolt hole. Among them, the bolt head of the internal hexagon bolt is located in the countersunk bolt head hole, the bolt shank of the internal hexagon bolt is located in the countersunk bolt shank hole, the diameter of the bolt head is D, and R>D>r; the height of the countersunk bolt head hole is not less than the height of the bolt head; the diameter of the bolt shank is d, d<r, and the length of the bolt shank is greater than the height of the countersunk bolt shank hole.

[0009] Preferably, the diameter of the countersunk bolt head hole is 48 mm and the depth is 30 mm; the specification of the internal hexagon bolt is M30×3.5.

[0010] Preferably, the size of the countersunk bolt shank hole is φ33; the diameter of the countersunk bolt shank hole is 33 mm.

[0011] Preferably, the internal hexagon bolt is a high-strength bolt of grade 10.9 or 12.9.

[0012] Preferably, there are three groups of bolt holes.

[0013] Compared with the prior art, the beneficial effects of the present utility model are:

[0014] The present utility model provides an intermediate guide plate on the entrance side of a finishing mill that is convenient for quick replacement, and solves the problem that after the intermediate guide plate of the side guide plate of the finishing mill is used for a period of time in a high-temperature vibration environment, the fixing screws are elongated and deformed, resulting in the intermediate guide plate warping. In particular, solutions are provided for technical problems such as the original thread planting being connected and fixed from bottom to top, the position being concealed, the operation space being narrow, and the replacement and installation being difficult.

[0015] The utility model can flexibly adapt to the existing intermediate guide plate by arranging countersunk bolt holes from top to bottom, without the need for large-scale modifications, thus reducing the cost and time of transformation; the countersunk bolt holes include countersunk bolt head holes (φ48mm deep 30mm) and countersunk bolt rod holes (φ33mm), and the depth of the bolt head countersunk hole is greater than the height of the nut, so that the nut is completely hidden inside the workpiece, maintaining the flatness of the connection surface and avoiding the impact on the transmission of the strip steel; high-strength bolts of grade 10.9 or 12.9 are used to improve the tensile strength, so that the bolts can withstand greater tension and shear force, effectively solving the problem of easy deformation of bolts in high temperature and vibration environments; by installing and tightening the bolts from top to bottom, the limitation of the narrow working space is overcome, and the convenience of installation and maintenance is greatly improved; the design of three groups of bolt holes ensures the flatness and stability of the installation of the intermediate plate, which is conducive to the smooth transmission of the strip steel.

[0016] These technical improvements not only significantly improve equipment maintenance efficiency and reduce replacement time, but also enhance the safety and reliability of equipment operation. More importantly, this design approach can be applied to other similar equipment maintenance scenarios in confined spaces, providing a new technical approach to solving similar problems in steel rolling mills, with significant economic benefits and promotional value. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of a preferred embodiment of the utility model;

[0018] Figure 2 In the preferred embodiment of the present utility model Figure 1 Top view of .

[0019] In the figure: 1. Countersunk bolt head hole; 2. Countersunk bolt shank hole. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0021] like Figures 1 and 2 As shown:

[0022] An intermediate guide plate at the inlet side of a finishing mill that is easy to replace quickly, comprising:

[0023] Guide plate body;

[0024] On the guide plate body, several groups of bolt holes penetrating the upper and lower surfaces of the guide plate body are provided. Each group of bolt holes includes two bolt holes. Each bolt hole includes a countersunk bolt head hole 1 with a diameter of R and a countersunk bolt rod hole 2 with a diameter of r. The countersunk bolt head hole 1 and the countersunk bolt rod hole 2 of each bolt hole are coaxially related, and R > r; the countersunk bolt head hole 1 is located above the countersunk bolt rod hole 2; An internal hexagon bolt is arranged in the bolt hole. Among them, the bolt head of the internal hexagon bolt is located in the countersunk bolt head hole 1, the bolt rod of the internal hexagon bolt is located in the countersunk bolt rod hole 2, the diameter of the bolt head is D, and R > D > r; the height of the countersunk bolt head hole 1 is not less than the height of the bolt head; the diameter of the bolt rod is d, d < r, and the length of the bolt rod is greater than the height of the countersunk bolt rod hole 2.

[0025] The diameter of the countersunk bolt head hole 1 is 48 mm and the depth is 30 mm; the specification of the internal hexagon bolt is M30×3.5.

[0026] The size of the countersunk bolt rod hole is φ33; the diameter of the countersunk bolt rod hole 2 is 33 mm.

[0027] There are three groups of bolt holes. There are a total of six bolt holes. Each bolt hole includes a countersunk bolt head hole 1 and a countersunk bolt rod hole 2. The six countersunk bolt holes are divided into two rows, with three holes in each row, arranged in a rectangle. The spacing between the two rows is equal to ensure the stability of the guide plate and uniform force. The spacing between adjacent two holes in each row is equal to ensure the symmetry of installation and the balance of the structure.

[0028] The internal hexagon bolt is a high-strength bolt of grade 10.9 or 12.9.

[0029] Specifically, the internal hexagon bolt is a bolt with an internal concave hexagon groove. This special design facilitates the installation and disassembly using a hexagon wrench or an internal hexagon wrench. There is a hexagonal internal groove in the center of the bolt head, and torque can be applied from the inside with a wrench instead of using an external wrench like a traditional bolt from the outside; it requires less installation space and is particularly suitable for precision equipment and machinery with a compact design.

[0030] The minimum tensile strength of a grade 10.9 bolt is 1040 MPa and the yield strength is 940 MPa; it is commonly used in mechanical structures with higher strength requirements. The minimum tensile strength of a grade 12.9 bolt is 1220 MPa and the yield strength is 1100 MPa. It has higher tensile strength and yield strength, is suitable for use under more severe conditions, can withstand greater loads and torques. Using high-strength bolts can improve the safety and reliability of the connection between components, reduce the risk of accidents caused by bolt breakage or failure, and ensure the stability of the device when承受 high loads.

[0031] The existing bottom-up bolt threading design requires operators to perform complex drilling and threading removal operations from the bottom of the equipment. This often requires operators to work in a cramped space in an uncomfortable position, increasing the difficulty and time required. However, hexagon socket bolts allow for direct and convenient tightening and removal using an allen wrench above the center guide plate, improving workspace utilization and significantly reducing equipment downtime.

[0032] By streamlining the disassembly and installation process, equipment maintenance time is significantly reduced. This savings not only improves productivity but also reduces the additional costs associated with extended equipment downtime, bringing tangible economic benefits to the company's operations. The increased working space provides a more flexible operating experience. Operators can easily access tools in a spacious and open environment, reducing the fatigue and risk of errors associated with working in confined spaces. This user-friendly design improves operational safety and reduces the likelihood of on-site accidents.

[0033] The depth of the countersunk bolt hole 1 is greater than the height of the nut, and the nut is completely hidden inside the middle guide plate to keep the connection surface flat.

[0034] Specifically, by making the depth of the countersunk bolt head hole (1) greater than the height of the nut, the nut can be completely positioned within the intermediate guide plate. This design maintains the flatness of the connection surface, eliminating the problem of protruding nut, thereby avoiding potential physical obstructions or interference during equipment operation. This not only improves equipment installation accuracy but also ensures a more effective and reliable connection during high-load operation. When the nut is completely concealed, the risk of accidental contact or snagging by operators or other equipment is reduced, significantly improving the safety of the operating environment. This is particularly important for equipment that requires frequent human contact and operation, minimizing accidents and operational errors. The resulting continuous, seamless surface makes cleaning and maintenance easier. Long-term use reduces wear and damage caused by protruding surface components, thereby extending the equipment's service life and improving its overall operational efficiency. This design helps ensure more consistent fastener connection force under high vibration or dynamic loads. The concealed nut will not loosen or damage due to external environmental challenges, thereby ensuring long-term system stability and strengthening the equipment's operational reliability. The concealed nut improves the overall visual appearance of the equipment, creating a cleaner appearance that conforms to industrial aesthetic standards. This design is particularly suitable for applications with strict requirements on appearance, such as high-precision instruments and modern industrial equipment, and can enhance the market competitiveness of the equipment.

[0035] Working principle:

[0036] Installation steps:

[0037] Align the new intermediate guide plate with the installation location and insert high-strength, grade 10.9 or 12.9, M30×3.5, 300mm long, hexagon socket head bolts from above into the countersunk bolt holes. The bolts must pass sequentially through the 48mm φ, 30mm deep countersunk bolt head hole 1 and the 33mm φ countersunk bolt shank hole 2. Tighten the six bolts diagonally from the outside inward, ensuring that all bolt heads are fully sunk into the workpiece and that the joint surface remains flat. The entire operation is performed from above, eliminating the need to access the mill floor, significantly improving efficiency.

[0038] Disassembly steps:

[0039] Use an Allen wrench to loosen the six Allen bolts from above the middle guide plate, starting from the outside and working diagonally inward. Then remove the middle guide plate.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An intermediate guide plate at the inlet side of a finishing mill that is easy to replace quickly, comprising a guide plate body; characterized in that: On the guide plate body, a number of groups of bolt holes penetrating the upper and lower surfaces of the guide plate body are provided. Each group of bolt holes includes two bolt holes. Each bolt hole includes a countersunk bolt head hole (1) with a diameter of R and a countersunk bolt rod hole (2) with a diameter of r. The countersunk bolt head hole (1) and the countersunk bolt rod hole (2) of each bolt hole are coaxial, and R > r; the countersunk bolt head hole (1) is located above the countersunk bolt rod hole (2); an internal hexagonal bolt is arranged in the bolt hole. Among them, the bolt head of the internal hexagonal bolt is located in the countersunk bolt head hole (1), the bolt rod of the internal hexagonal bolt is located in the countersunk bolt rod hole (2), the diameter of the bolt head is D, and R > D > r; the height of the countersunk bolt head hole (1) is not less than the height of the bolt head; the diameter of the bolt rod is d, d < r, and the length of the bolt rod is greater than the height of the countersunk bolt rod hole (2).

2. The intermediate guide plate at the inlet side of the finishing mill that is easy to replace quickly according to claim 1 is characterized in that: The diameter of the countersunk bolt head hole (1) is 48 mm and the depth is 30 mm; the specification of the internal hexagonal bolt is M30×3.

5.

3. The intermediate guide plate at the inlet side of the finishing mill that is easy to replace quickly according to claim 1 is characterized in that: The size of the countersunk bolt rod hole is φ33; the diameter of the countersunk bolt rod hole (2) is 33 mm.

4. The intermediate guide plate at the inlet side of the finishing mill that is easy to replace quickly according to claim 1, characterized in that: The internal hexagonal bolt is a high-strength bolt of grade 10.9 or 12.

9.

5. The intermediate guide plate at the inlet side of the finishing mill that is easy to replace quickly according to claim 1, characterized in that: There are three groups of the bolt holes.

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