Rolling mill guard anti-overturning limiting protection device

Abstract

The utility model discloses a kind of rolling mill guard plate anti-overturning limit protection devices, including lower roll chock base body, work lower roll chock base body is provided with guard plate, guard plate is arranged in pairs in the two sides of lower roll chock, guard plate is hinged and installed in the front end / rear end of lower roll chock for guiding plate blank to enter roll gap, mechanical rigid limit module and dynamic damping module two-stage protective body are built on lower roll chock base body, guard plate is displaced in the vertical direction of lower roll chock base body by the mechanical rigid limit module control, and the instantaneous heat generated by dynamic damping module guide dissipates impact, the mechanical rigid limit module includes protective plate body, the protective plate body is arranged in pairs in the two sides of lower roll chock base body;The mechanical rigid limit module further includes the main positioning hole being set in lower roll chock base body, and the cooperation gap between the main positioning hole and the positioning shaft being set on guard plate controls guard plate vertical direction displacement.

Description

Technical Field

[0001] This utility model belongs to the field of safety technology of metallurgical rolling mill equipment, specifically relating to a rolling mill guard plate anti-overturning limit protection device. Background Technology

[0002] During the operation of the hot rolling mill, the guard plate, as a key guiding component, is mounted on the lower roll bearing seat via a pivot. When rolling high-strength steel billets, the billets generate continuous friction and instantaneous impact loads on the guard plate. According to the measured data analysis: friction range: 8 to 12 kN. peak impact load: over 15 kN. The original design allowed the guard plate to swing freely around the axis 360 degrees, which led to the following technical problems: (1) abnormal overturning phenomenon: the impact force of the billet caused the guard plate to flip up and collide violently with the moving billet. (2) structural failure: the guard plate underwent shear fracture at a 45-degree angle. (3) damage to related equipment: the torsional deformation of the guide roller exceeded 5 mm, and indentations with a depth of 0.3 to 0.8 mm were generated on the surface of the roll. (4) system resonance problem: the natural frequency of the guard plate of 3.8 Hz resonated with the rolling frequency of 2 to 5 Hz.

[0003] Limitations of existing solutions

[0004] (1) Spring damping scheme: In the high temperature environment of the rolling zone exceeding 300 degrees Celsius, the spring element will experience aging failure. (2) Counterweight balancing scheme: Increasing the counterweight will increase the inertial torque and aggravate the mechanical load on the bearing housing. (3) Hydraulic buffer scheme: The system structure is complex and the daily maintenance cost increases.

[0005] In view of the above factors, a mill guard plate anti-overturning limit protection device is provided to eliminate the fracture failure caused by abnormal overturning of the guard plate and block the transmission path of impact force to the rolling mill system. Utility Model Content

[0006] The purpose of this utility model is to provide a rolling mill guard plate anti-rollover limit protection device to solve the problems mentioned in the background art.

[0007] The purpose of this utility model is achieved through the following technical solution: a rolling mill guard plate anti-overturning limit protection device, including a lower roll bearing seat base, a guard plate is provided on the lower roll bearing seat base, the guard plates are arranged in pairs on both sides of the lower roll bearing seat, the guard plates are hinged to the front / rear end of the lower roll bearing seat through a rotating shaft to guide the slab into the roll gap, including a dual-level protection body consisting of a mechanical rigid limit module and a dynamic damping module built on the lower roll bearing seat base;

[0008] The mechanical rigid limiting module controls the vertical displacement of the guard plate on the lower roll bearing base, and the dynamic damping module dissipates the instantaneous heat generated by the impact.

[0009] Furthermore, the mechanical rigid limiting module includes a protective plate body, which is arranged in pairs on both sides of the lower roll bearing seat base;

[0010] The mechanical rigid limiting module also includes a main positioning hole set in the base of the lower roll bearing seat, and the vertical displacement of the guard plate is controlled by the fitting clearance between the main positioning hole and the positioning shaft set on the guard plate.

[0011] Furthermore, the main positioning holes are formed on the bearing seat mounting surface of the lower roll bearing seat base, the main positioning holes are symmetrically arranged, and the main positioning holes are clearance-fitted with the positioning shaft fixedly arranged on the guard plate.

[0012] Furthermore, the dynamic damping module includes a first energy dissipation structure that directly contacts the mounting surface of the lower roll bearing housing base. The dynamic damping module also includes a second energy dissipation structure that is attached to the back of the protective plate body.

[0013] Furthermore, the first layer of energy dissipation structure is fixed to the mounting surface of the lower roll bearing housing by adhesive bonding or bolting, and the edge of the first layer of energy dissipation structure is aligned with the bearing housing.

[0014] The second layer of energy dissipation structure is bonded to the back of the protective plate body.

[0015] Furthermore, the protective plate body material is selected from NM450 grade wear-resistant steel plate, and the thickness of the protective plate body is 8 mm ± 0.5 mm tolerance;

[0016] The protective plate body has a length of 650 mm ± 0.2 mm and a width of 120 mm ± 0.3 mm, and is mounted on the mounting surface of the lower roll bearing seat base;

[0017] The protective plate body has bolt holes, with four bolt holes of 18 mm in diameter.

[0018] Furthermore, the first energy dissipation structure is a silicone rubber damping layer, which has a temperature resistance of 350 degrees Celsius and a hardness index of 70A ± 5 units on the Shore A scale.

[0019] The first energy dissipation structure is a 3-5 mm thick silicone rubber damping layer.

[0020] Furthermore, the second energy dissipation structure is a copper thermally conductive foil, which is 1-3 mm thick and has a thermal conductivity exceeding 380 W / m·K.

[0021] The implementation method of the anti-overturning limit protection device for rolling mill guard plates specifically includes the following steps;

[0022] Step 1: Lay the first layer of energy dissipation structure, namely the silicone rubber damping layer, on the mounting surface of the lower roll bearing housing base. The first layer of energy dissipation structure is fixed to the bearing housing mounting surface by adhesive or bolts. The edge of the damping layer is strictly aligned with the bearing housing, and it is ensured that there are no wrinkles during the laying process.

[0023] Step 2: In the second layer of energy dissipation structure, namely copper thermal conductive foil, the copper thermal conductive foil is bonded to the back of the protective plate body and gently pressed to remove interlayer air bubbles.

[0024] Step 3: The main positioning holes are opened on the bearing seat mounting surface of the lower roll bearing seat base. The main positioning holes are symmetrically arranged, and the main positioning holes are clearance-fitted with the positioning shaft fixedly set on the guard plate.

[0025] Step 4: Install the main body of the protective plate. The main body of the protective plate has bolt holes, with 4 bolt holes of 18 mm in diameter.

[0026] For initial bolt tightening, use a diagonal pre-tightening torque of 30 N·m and check the flatness of the installation to be ≤0.1 mm. For intermediate bolt tightening, use a torque of 80 N·m and tighten in a cross-shaped sequence to eliminate assembly gaps. For final bolt tightening, use a torque of 120 N·m and tighten clockwise in sequence (control the amount of bolt plastic deformation <5%).

[0027] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0028] This invention completely eliminates the fracture failure caused by abnormal overturning of the guard plate, blocks the transmission path of impact force to the rolling mill system, and precisely controls the swing amplitude of the guard plate within the physical safety threshold range.

[0029] This invention strictly limits the vertical displacement of the guard plate to within 10 mm ± 1 mm (corresponding to a swing angle ≤ 3 degrees) by the fit gap between the inner wall of the main positioning hole and the guard plate shaft. This range is only 10% of the original free swing angle (about 30 degrees). Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the connection between the protective plate and the lower roll bearing seat base of this utility model;

[0031] Figure 2 This is a utility model Figure 1 A magnified view of a portion of the image;

[0032] Figure 3 This is a partially enlarged schematic diagram of the first-layer energy dissipation structure of this utility model;

[0033] Figure 4 This is a schematic diagram of the connection between the lower roll bearing seat base and the mechanical rigid limiting module of this utility model;

[0034] Figure 5 This is a schematic diagram of the installation of the protective plate body and the guard plate of this utility model;

[0035] Figure 6 This is a schematic diagram of the main positioning hole on the base of the lower roll bearing seat of this utility model;

[0036] Figure 7 This is a schematic diagram of the cooperation between the protective plate and the protective plate body of this utility model. Detailed Implementation

[0037] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0038] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0039] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0040] like Figure 1-7 As shown, a mill guard plate anti-overturning limit protection device includes a lower roll bearing seat base 1, a guard plate 2 is provided on the lower roll bearing seat base 1, the guard plates 2 are arranged in pairs on both sides of the lower roll bearing seat, and the guard plates 2 are hinged to the front / rear end of the lower roll bearing seat through a rotating shaft to guide the slab into the roll gap. The device includes a dual-level protection body consisting of a mechanical rigid limit module 3 and a dynamic damping module 4 built on the lower roll bearing seat base 1.

[0041] The mechanical rigid limiting module 3 controls the vertical displacement of the guard plate 2 in the lower roll bearing seat base 1, and the dynamic damping module 4 dissipates the instantaneous heat generated by the impact.

[0042] In order to facilitate the vertical displacement of the guard plate within 10 mm ± 1 mm by means of the fit clearance between the inner wall of the main positioning hole and the guard plate shaft during use, the mechanical rigid limiting module 3 includes a guard plate body 5, which is arranged in pairs on both sides of the lower roll bearing seat base 1.

[0043] The protective plate body 5 is fixed along the rolling direction along the lower roll bearing seat base 1 by bolts. The protective plate body 5 is fixed on the lower roll bearing seat base 1 by bolts.

[0044] The mechanical rigid limiting module 3 also includes a main positioning hole 6 provided in the lower roll bearing seat base 1, and the vertical displacement of the guard plate 2 is controlled by the fit clearance between the main positioning hole 6 and the positioning shaft 7 provided on the guard plate 2.

[0045] The main positioning hole 6 is opened on the bearing seat mounting surface of the lower roll bearing seat base 1. The main positioning holes 6 are symmetrically arranged, and the main positioning hole 6 is clearance-fitted with the positioning shaft 8 fixedly arranged on the guard plate 2.

[0046] Among them, the guard plates 2 are arranged in pairs on both sides of the lower roll bearing seat, the upper end face of the guard plate 2 is in contact with the bottom end face of the guard plate body 5, and the guard plates 2 are set at the end of the roller table near the lower roll bearing seat.

[0047] In order to facilitate the rapid dissipation of instantaneous heat generated by impact under operating conditions, the dynamic damping module 4 includes a first energy dissipation structure 9, which directly contacts the mounting surface of the lower roll bearing base 1. The dynamic damping module 4 also includes a second energy dissipation structure 10, which is attached to the back of the protective plate body 5.

[0048] The first layer of energy dissipation structure 9 is fixed to the mounting surface of the lower roll bearing housing base 1 by adhesive or bolt, and the edge of the first layer of energy dissipation structure 9 is aligned with the bearing housing.

[0049] The second layer of energy dissipation structure 10 is bonded to the back of the protective plate body 5.

[0050] The protective plate body 5 is made of NM450 grade wear-resistant steel plate, and the thickness of the protective plate body 5 is 8 mm ± 0.5 mm tolerance;

[0051] The protective plate body 5 has a length of 650 mm ± 0.2 mm and a width of 120 mm ± 0.3 mm, and is mounted on the mounting surface of the lower roll bearing seat base 1.

[0052] The protective plate body 5 has bolt holes, with four bolt holes of 18 mm in diameter.

[0053] The first energy dissipation structure 9 is a silicone rubber damping layer. The silicone rubber damping layer has a temperature resistance of 350 degrees Celsius and a working capacity. Its hardness index is Shore hardness 70A±5 units.

[0054] The first energy dissipation structure 9 is a 3-5 mm thick silicone rubber damping layer.

[0055] The second energy dissipation structure 10 is a copper thermally conductive foil of 1-3 mm thickness, and the thermal conductivity of the copper thermally conductive foil exceeds 380 W / m·K.

[0056] The implementation method of the anti-overturning limit protection device for rolling mill guard plates specifically includes the following steps;

[0057] Step 1: Lay the first layer of energy dissipation structure, namely the silicone rubber damping layer, on the mounting surface of the lower roll bearing housing base. The first layer of energy dissipation structure is fixed to the bearing housing mounting surface by adhesive or bolts. The edge of the damping layer is strictly aligned with the bearing housing, and it is ensured that there are no wrinkles during the laying process.

[0058] Step 2: In the second layer of energy dissipation structure, namely copper thermal conductive foil, the copper thermal conductive foil is bonded to the back of the protective plate body and gently pressed to remove interlayer air bubbles.

[0059] Step 3: The main positioning holes are opened on the bearing seat mounting surface of the lower roll bearing seat base. The main positioning holes are symmetrically arranged, and the main positioning holes are clearance-fitted with the positioning shaft fixedly set on the guard plate.

[0060] Step 4: Install the main body of the protective plate. The main body of the protective plate has bolt holes, with 4 bolt holes of 18 mm in diameter.

[0061] For initial bolt tightening, use a diagonal pre-tightening torque of 30 N·m and check the flatness of the installation to be ≤0.1 mm. For intermediate bolt tightening, use a torque of 80 N·m and tighten in a cross-shaped sequence to eliminate assembly gaps. For final bolt tightening, use a torque of 120 N·m and tighten clockwise in sequence (control the amount of bolt plastic deformation <5%).

[0062] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0063] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A rolling mill guard plate anti-overturning limit protection device, comprising a lower roll bearing seat base (1), a guard plate (2) is provided on the lower roll bearing seat base (1), the guard plates (2) are arranged in pairs on both sides of the lower roll bearing seat, and the guard plates (2) are hinged to the front / rear end of the lower roll bearing seat via a rotating shaft to guide the slab into the roll gap, characterized in that: The system includes a dual-stage protective structure consisting of a mechanical rigid limiting module (3) and a dynamic damping module (4) built on the lower roll bearing housing base (1); The mechanical rigid limiting module (3) controls the vertical displacement of the guard plate (2) in the lower roll bearing base (1), and the dynamic damping module (4) dissipates the instantaneous heat generated by the impact.

2. The anti-overturning limit protection device for rolling mill guard plates according to claim 1, characterized in that: The mechanical rigid limiting module (3) includes a protective plate body (5), which is arranged in pairs on both sides of the lower roll bearing seat base (1); The mechanical rigid limiting module (3) also includes a main positioning hole (6) set in the lower roll bearing seat base (1), and the vertical displacement of the guard plate (2) is controlled by the fit clearance between the main positioning hole (6) and the positioning shaft (7) set on the guard plate (2).

3. The anti-overturning limit protection device for rolling mill guard plates according to claim 2, characterized in that: The main positioning hole (6) is opened on the bearing seat mounting surface of the lower roll bearing seat base (1). The main positioning holes (6) are symmetrically arranged, and the main positioning hole (6) is clearance-fitted with the positioning shaft (7) fixed on the guard plate (2).

4. The anti-overturning limit protection device for rolling mill guard plates according to claim 3, characterized in that: The dynamic damping module (4) includes a first energy dissipation structure (9), which directly contacts the mounting surface of the lower roll bearing seat base (1). The dynamic damping module (4) also includes a second energy dissipation structure (10), which is attached to the back of the protective plate body (5).

5. The anti-rollover limit protection device for rolling mill guard plates according to claim 4, characterized in that: The first layer of energy dissipation structure (9) is fixed to the mounting surface of the lower roll bearing housing base (1) by adhesive or bolt, and the edge of the first layer of energy dissipation structure (9) is aligned with the bearing housing. The second layer of energy dissipation structure (10) is bonded to the back of the protective plate body (5) by an adhesive method.

6. The anti-overturning limit protection device for rolling mill guard plates according to claim 5, characterized in that: The material of the protective plate body (5) is NM450 grade wear-resistant steel plate, and the thickness of the protective plate body (5) is 8 mm ± 0.5 mm tolerance; The protective plate body (5) has a length of 650 mm ± 0.2 mm and a width of 120 mm ± 0.3 mm, which is matched on the mounting surface of the lower roll bearing seat base (1); The protective plate body (5) has bolt holes, with four bolt holes of 18 mm in diameter.

7. The anti-rollover limit protection device for rolling mill guard plates according to claim 6, characterized in that: The first energy dissipation structure (9) is a silicone rubber damping layer. The silicone rubber damping layer has a temperature resistance of 350 degrees Celsius and a working capacity. Its hardness index is Shore hardness 70A ± 5 units. The first energy dissipation structure (9) is a 3-5 mm silicone rubber damping layer.

8. The anti-overturning limit protection device for rolling mill guard plates according to claim 7, characterized in that: The second energy dissipation structure (10) is a copper thermally conductive foil of 1-3 mm, and the thermal conductivity of the copper thermally conductive foil exceeds 380 W / m·K.

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