Inlet guard plate for rolling Z-shaped steel

Abstract

The utility model belongs to the technical field of guard plate, especially is an entrance guard plate for Z steel rolling, including fixed base and small guard plate, the fixed base upper portion is inlayed with nut seat, a plurality of spacers are arranged on the fixed base, the spacer is arranged small guard plate, the small guard plate is in and is equipped with threaded pin shaft, the sidewall of a part in the spacer is fixed with the plug -in board, the sidewall of another part in the spacer is correspondingly provided with the plug -in groove, the movable small guard plate structure of the application can be set, can be in the rolling moment to long leg tip active, accurate flexible guide, forces it to enter the roll hole type stably, fundamentally avoids the violent scraping and cutting of long leg tip and hole type edge, completely eliminates the " pull iron wire " phenomenon, the guide surface of small guard plate can constrain the vertical and horizontal displacement of long leg tip from the side below, effectively inhibits the up and down shaking and lateral deviation due to the structure slender, low high temperature strength, guarantees the stability of the entry steel.

Description

Technical Field

[0001] This utility model belongs to the field of protective plate technology, specifically relating to an inlet protective plate for Z-shaped steel rolling. Background Technology

[0002] Z-shaped steel is a special type of steel, named for its Z-shaped shape. Currently, 310 Z-shaped steel is a special steel used in railway carriages. In particular, the successful development of YQ450 steel in recent years has further consolidated the application of 310 Z-shaped steel.

[0003] In the rolling production of 310 Z-shaped steel, especially high-strength steel grades such as YQ450, ensuring the stability and consistency of its "Z"-shaped long leg dimensions (especially the 174mm inner cavity dimension) is the key to improving the yield. The main quality defects currently existing are fluctuations in long leg length (long or short long leg) and folding of the long leg tip.

[0004] In existing technologies, the traditional guard plate at the entrance of a universal roughing mill is usually a fixed structure, which cannot effectively guide the long leg tip. At the moment when the red steel bites into the roll pass at high speed, the long leg tip is prone to vertical shaking or lateral displacement due to its slender structure, high temperature, and low strength. It cannot be accurately guided into the pass by the fixed guard plate, resulting in severe scraping and cutting between the long leg tip and the edge of the pass. The cut metal adheres to the surface of the billet and is rolled into the body in the subsequent universal finishing rolling, forming a fatal folding defect. Utility Model Content

[0005] To address the problem mentioned in the background art, the traditional guard plate at the entrance of a universal roughing mill is usually a fixed structure, which cannot effectively guide the long leg tip. At the moment the red-hot steel bites into the roll pass at high speed, the long leg tip, due to its slender structure, high temperature, and low strength, is prone to vertical vibration or lateral displacement, making it impossible for the fixed guard plate to accurately guide it into the pass. This results in severe scraping and cutting between the long leg tip and the edge of the pass, with the cut-off metal adhering to the surface of the billet and being rolled into the billet body during subsequent universal finishing rolling, forming a fatal folding defect. This utility model provides an entrance guard plate for Z-shaped steel rolling.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an inlet guard plate for rolling Z-shaped steel, comprising a fixed base and a small guard plate, wherein a nut seat is embedded in the upper part of the fixed base, a plurality of pads are placed on the fixed base, a small guard plate is placed on the pads, and a threaded pin passes through the small guard plate;

[0007] A plug-in plate is fixed to a portion of the side wall of the pad, and a corresponding plug-in groove is provided on the side wall of another portion of the pad.

[0008] As a preferred embodiment of the inlet guard plate for rolling Z-shaped steel according to this utility model, the small guard plate is hinged to the pad plate by the threaded pin, and the threaded pin passes through the corresponding holes on the small guard plate and the pad plate in sequence.

[0009] As a preferred embodiment of the inlet guard plate for rolling Z-shaped steel according to this utility model, the end of the threaded pin is screwed into the nut seat to press and fix the small guard plate and the pad onto the fixed base.

[0010] As a preferred embodiment of the inlet guard plate for rolling Z-shaped steel according to this utility model, the small guard plate is provided with an installation slot, and a wear-resistant plate is embedded in the installation slot. The wear-resistant plate is fixed to the small guard plate by bolts.

[0011] As a preferred embodiment of the inlet guard plate for rolling Z-shaped steel according to this utility model, the pad plate is composed of two symmetrical parts, and the two symmetrically distributed pad plates have a snap-fit ​​groove at the connection point corresponding to the position of the threaded pin shaft.

[0012] As a preferred embodiment of the inlet guard plate for Z-shaped steel rolling of this utility model, the plug-in plate is adapted to the plug-in groove so that the two parts of the pad plate can be plugged into each other and combined, and the pad plate after being plugged into each other is fastened together by bolts.

[0013] As a preferred embodiment of the inlet guard plate for Z-shaped steel rolling of this utility model, the number of the pads is multiple sets, and the pads have different thicknesses. The working height of the small guard plate can be adjusted by replacing the pads with different thickness combinations.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: By setting a movable small guard plate structure, the long leg tip can be actively and precisely flexibly guided during rolling, forcing it to enter the roll pass stably. This fundamentally avoids the severe scraping and cutting between the long leg tip and the edge of the roll pass, completely eliminating the "pulling iron wire" phenomenon. The guide surface of the small guard plate can simultaneously constrain the vertical and horizontal displacement of the long leg tip from the side and below, effectively suppressing the vertical shaking and lateral displacement caused by the slender structure and low high-temperature strength, ensuring the stability of the steel entry, and preventing the problem that the traditional guard plate with a fixed structure cannot effectively guide the long leg tip, which easily leads to severe scraping and cutting between the long leg tip and the edge of the roll pass, forming folding defects. Attached Figure Description

[0015] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the structure of the small protective board of this utility model;

[0018] Figure 3 This is a schematic diagram of the internal structure of the small protective board of this utility model;

[0019] Figure 4 This is a schematic diagram of the structure of the fixed base in this utility model;

[0020] Figure 5 This is a schematic diagram of the structure of the pad in this utility model.

[0021] In the diagram: 1. Fixed base; 2. Small protective plate; 3. Threaded pin; 4. Nut seat; 5. Washer plate; 6. Wear-resistant plate; 7. Positioning bolt; 8. Mounting slot; 9. Snap-fit ​​slot; 10. Insertion plate; 11. Insertion slot. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Example 1

[0024] like Figures 1-5 As shown;

[0025] An inlet guard plate for rolling Z-shaped steel includes a fixed base 1 and a small guard plate 2. A nut seat 4 is embedded in the upper part of the fixed base 1. Several pads 5 are placed on the fixed base 1, and the small guard plates 2 are placed on the pads 5. A threaded pin 3 passes through the small guard plate 2. A plug-in plate 10 is fixed to the side wall of a part of the pads 5, and a plug-in groove 11 is correspondingly opened on the side wall of another part of the pads 5.

[0026] In this implementation plan: by setting up a movable small guard plate 2 structure, the long leg tip can be actively and precisely flexibly guided during rolling, forcing it to enter the roll pass stably. This fundamentally avoids the severe scraping and cutting between the long leg tip and the edge of the roll pass, completely eliminating the "pulling iron wire" phenomenon. The guide surface of the small guard plate 2 can simultaneously constrain the vertical and horizontal displacement of the long leg tip from the side and below, effectively suppressing the vertical shaking and lateral displacement caused by the slender structure and low high-temperature strength, thus ensuring the stability of the steel entry.

[0027] In an optional embodiment, the small guard plate 2 is hinged to the pad plate 5 by a threaded pin 3, which passes through corresponding holes on the small guard plate 2 and the pad plate 5 in sequence.

[0028] In this implementation scheme: the hinged structure enables the small guard plate 2 to generate a slight adaptive oscillation when impacted by the steel billet, forming a flexible guiding mechanism rather than a rigid collision, thereby effectively reducing impact stress, protecting the guard plate and the surface of the steel billet, and improving the smoothness and fault tolerance of the guidance.

[0029] In an optional embodiment, the end of the threaded pin 3 is screwed into the nut seat 4 to press and fix the small guard plate 2 and the pad 5 onto the fixed base 1.

[0030] In this implementation scheme: This connection method constitutes a stable, reliable and detachable fastening structure, which can ensure that the small guard plate 2 and the pad plate 5 remain tightly fixed during rolling vibration, preventing them from loosening or moving, thereby ensuring the stability and safety of equipment operation.

[0031] In an optional embodiment, the small protective plate 2 is provided with a mounting slot 8, and a wear-resistant plate 6 is embedded in the mounting slot 8. The wear-resistant plate 6 is fixed to the small protective plate 2 by bolts.

[0032] In this implementation plan: the structure realizes modularization and quick replacement of vulnerable parts. When the wear plate 6 is worn, it is not necessary to replace the entire small guard plate 2, only the wear plate 6 needs to be replaced, which greatly reduces maintenance costs and downtime, and improves economic efficiency.

[0033] In an optional embodiment, the pad 5 is composed of two symmetrical parts, and the two symmetrically distributed pads 5 have a snap-fit ​​groove 9 at the connection point corresponding to the position of the threaded pin 3.

[0034] In this implementation scheme: This design allows the pad 5 to be installed and adjusted from both sides of the pin shaft, which facilitates precise alignment during adjustment and makes it easier to disassemble and replace individual pads 5, thus improving the convenience and accuracy of the adjustment operation.

[0035] In an optional embodiment, the plug plate 10 is adapted to the plug slot 11 so that the two parts of the pad 5 can be plugged into each other and combined, and the pad 5 after being plugged into each other is fastened together by bolts.

[0036] In this implementation plan, the connection method of plug-in and bolt locking ensures the integrity and structural strength of the symmetrical two-part pad 5 after assembly, prevents misalignment or separation under stress, and ensures the stability of the support height.

[0037] In one optional embodiment, there are multiple sets of pads 5, and the pads 5 have different thicknesses. The working height of the small guard plate 2 can be adjusted by replacing pads 5 with different thickness combinations.

[0038] In this implementation scheme: by selecting and combining pads 5 of different thicknesses, the working height of the small guard plate 2 can be precisely and gradedly adjusted, thereby flexibly adapting to changes caused by roller wear, die replacement or different product specifications, greatly enhancing the versatility and adaptability of the device.

[0039] Working principle:

[0040] Installation and pre-adjustment: First, the fixed base 1 is securely installed on the guide beam on the entrance side of the UR mill through the connecting structure on it, ensuring that its position is directly aligned with the long leg entrance channel of the roll. According to the current roll gap, roll wear and the specifications of the incoming steel billet, coarse and fine adjustments are made. Coarse adjustment can be achieved by selecting combinations of shims 5 of different thicknesses. During fine adjustment, the connecting bolts can be removed, and by adding, subtracting or replacing symmetrically distributed shims 5, the design of its plug-in plate 10 and plug-in groove 11 can be easily plugged and pulled to change the overall height and tilt angle of the small guard plate 2, thereby accurately setting the initial position of its guide surface.

[0041] Guidance and Protection: When the high-temperature 310 Z-shaped steel billet runs along the roller table towards the UR rolling mill, its long leg is suspended. In the instant before the billet is bitten by the roll, its trembling long leg tip first contacts the guide surface of the wear-resistant plate 6 at the front end of the small guard plate 2. The guide surface is a designed inclined or curved surface that can simultaneously contact the long leg tip from the side and below. Under the push of the red steel, the small guard plate 2 can generate a slight adaptive swing around the threaded pin 3, forming a "flexible guidance" effect rather than a rigid collision. This contact force is decomposed into two components: a downward component suppresses the upward tendency of the long leg tip due to vibration, and an inward component corrects its lateral deviation and straightens the posture of the long leg. Finally, under the constraint of the small guard plate 2, the long leg tip is smoothly and accurately "sent" into the roll pass, perfectly avoiding scraping with the edge of the pass, thus eliminating the occurrence of "pulling iron wire" and subsequent folding defects.

[0042] Maintenance and Replacement: When the wear-resistant plate 6, which rubs directly against the steel billet, is worn, there is no need to disassemble the entire device. Simply loosen the positioning bolts 7 to remove the old wear-resistant plate 6 from the mounting slot 8 and replace it with a new plate. This greatly saves maintenance time and costs. If a major adjustment is required, the threaded pin 3 can be loosened through the nut seat 4 to maintain the entire small guard plate module.

[0043] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An inlet guard plate for rolling Z-shaped steel, comprising a fixed base (1) and a small guard plate (2), characterized in that: The fixed base (1) is fitted with a nut seat (4) on the upper part, and several pads (5) are placed on the fixed base (1). Small guard plates (2) are placed on the pads (5), and threaded pins (3) are inserted in the small guard plates (2). A plug-in plate (10) is fixed to a portion of the side wall of the pad (5), and a plug-in groove (11) is correspondingly opened on the side wall of another portion of the pad (5).

2. The inlet guard plate for Z-shaped steel rolling according to claim 1, characterized in that: The small guard plate (2) is hinged to the pad plate (5) by the threaded pin (3), and the threaded pin (3) passes through the corresponding holes on the small guard plate (2) and the pad plate (5) in sequence.

3. The inlet guard plate for Z-shaped steel rolling according to claim 1, characterized in that: The end of the threaded pin (3) is screwed into the nut seat (4) to press and fix the small guard plate (2) and the pad (5) onto the fixed base (1).

4. The inlet guard plate for Z-shaped steel rolling according to claim 1, characterized in that: The small protective plate (2) is provided with an installation slot (8), and a wear-resistant plate (6) is embedded in the installation slot (8). The wear-resistant plate (6) is fixed to the small protective plate (2) by bolts.

5. The inlet guard plate for Z-shaped steel rolling according to claim 1, characterized in that: The pad (5) is composed of two symmetrical parts, and the two symmetrically distributed pads (5) have a snap-fit ​​groove (9) at the connection point corresponding to the position of the threaded pin (3).

6. The inlet guard plate for Z-shaped steel rolling according to claim 1, characterized in that: The plug plate (10) is adapted to the plug slot (11) so that the two pads (5) can be plugged into each other and combined, and the pads (5) after being plugged into each other are fastened together by bolts.

7. The inlet guard plate for Z-shaped steel rolling according to claim 1, characterized in that: The number of pads (5) is multiple sets, and the thickness of the pads (5) is different. The working height of the small guard plate (2) can be adjusted by replacing pads (5) with different thickness combinations.

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