Rolling mill guard plate anti-overturning limiting protection device and implementation method thereof

Abstract

The invention discloses a rolling mill guard plate anti-overturning limiting protection device and an implementation method thereof.The rolling mill guard plate anti-overturning limiting protection device comprises a lower roller bearing seat base body, guard plates are arranged on the lower roller bearing seat base body, and the guard plates are arranged on the two sides of a lower roller bearing seat in pairs; the guard plate is hinged to the front end / rear end of the lower roll bearing seat through a rotating shaft and used for guiding a plate blank to enter a roll gap, a mechanical rigid limiting module and dynamic damping module double-stage protection body is constructed on a lower roll bearing seat base body, and the mechanical rigid limiting module controls the guard plate to move in the vertical direction of the lower roll bearing seat base body. Instant heat generated by impact is dissipated through the dynamic damping module, the mechanical rigid limiting module comprises protection plate bodies, and the protection plate bodies are arranged on the two sides of the lower roller bearing seat base body in pairs; the mechanical rigid limiting module further comprises a main positioning hole formed in the lower roller bearing seat base body, and displacement of the guard plate in the vertical direction is controlled through a fit clearance between the main positioning hole and a positioning shaft arranged on the guard plate.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of metallurgical rolling mill safety technology, and particularly relates to a rolling mill guard plate anti-overturning limiting protection device and an implementation method thereof. BACKGROUND

[0002] In the operation process of a hot rolling mill, the guard plate, as a key guiding component, is installed on the lower roll bearing seat through shaft hinging. When high-strength billets are rolled, the billets generate continuous friction force and instantaneous impact load on the guard plate. According to the measured data analysis, the friction force ranges from 8 to 12 kN (kilo Newton), and the impact load peak value exceeds 15 kN. The original design allows the guard plate to freely swing 360 degrees around the shaft, which causes the following technical problems: (1) abnormal overturning phenomenon: the impact force of the billet causes the guard plate to turn up, and the guard plate collides violently with the moving billet; (2) structural failure: the guard plate appears 45-degree angle shear fracture; (3) associated equipment damage: the guide roll is twisted and deformed by more than 5 mm, and the roll surface produces a 0.3 to 0.8 mm deep indentation; (4) system resonance problem: the natural frequency of the guard plate is 3.8 Hz (Hertz), which overlaps with the rolling frequency of 2 to 5 Hz.

[0003] Limitations of existing solutions

[0004] (1) Spring damping scheme: in a high-temperature environment of more than 300 degrees Celsius in the rolling area, the spring element will have a time-dependent failure phenomenon. (2) Counterweight balancing scheme: increasing the counterweight increases the inertial moment, aggravating the mechanical load of the bearing seat. (3) Hydraulic buffer scheme: the system structure is complex, and the daily maintenance cost increases.

[0005] In view of the above factors, a rolling mill guard plate anti-overturning limiting protection device and an implementation method thereof are provided to eliminate the fracture failure caused by abnormal overturning of the guard plate and block the conduction path of the impact force to the roll system. SUMMARY

[0006] The purpose of the present application is to provide a rolling mill guard plate anti-overturning limiting protection device and an implementation method thereof to solve the problems raised in the background.

[0007] The purpose of the present application is achieved by the following technical solution: a rolling mill guard plate anti-overturning limiting protection device, comprising a lower roll bearing seat base body, a guard plate arranged on the lower roll bearing seat base body, the guard plate being arranged on both sides of the lower roll bearing seat in pairs, the guard plate being hingedly installed on the front end / rear end of the lower roll bearing seat for guiding the slab into the roll gap, comprising a mechanical rigid limiting module and a dynamic damping module two-stage protection body constructed on the lower roll bearing seat base body;

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

[0009] Further, the mechanical rigid limiting module includes a guard plate body arranged on both sides of the lower roll bearing seat base.

[0010] The mechanical rigid limiting module further includes a main positioning hole provided on the lower roll bearing seat base, and the vertical displacement of the guard plate is controlled through the cooperation gap between the main positioning hole and the positioning shaft provided on the guard plate.

[0011] Further, the main positioning hole is provided on the bearing seat mounting surface of the lower roll bearing seat base, and the main positioning hole is symmetrically arranged, and the main positioning hole is gap-fitted with the positioning shaft fixedly provided on the guard plate.

[0012] Further, the dynamic damping module includes a first layer of energy dissipation structure directly contacting the mounting surface of the lower roll bearing seat base, and a second layer of energy dissipation structure attached to the back of the guard plate body.

[0013] Further, the first layer of energy dissipation structure is fixed on the mounting surface of the lower roll bearing seat base by bonding or bolt method, and the edge of the first layer of energy dissipation structure is aligned with the bearing seat.

[0014] The second layer of energy dissipation structure is attached to the back of the guard plate body by bonding.

[0015] Further, the material of the guard plate body is selected from NM450 grade wear-resistant steel plate, and the thickness of the guard plate body is 8 millimeters ± 0.5 millimeters tolerance.

[0016] The length of the guard plate body is 650 millimeters ± 0.2 millimeters, and the width of the guard plate body is 120 millimeters ± 0.3 millimeters, which matches the mounting surface of the lower roll bearing seat base.

[0017] The guard plate body is provided with bolt holes, and the bolt holes are provided with four holes with a diameter of 18 millimeters.

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

[0019] The first layer of energy dissipation structure is a silicone rubber damping layer with a thickness of 3-5 millimeters.

[0020] Further, the second layer of energy dissipation structure is a copper heat conduction foil, the second layer of energy dissipation structure is a copper heat conduction foil of 1-3 mm, and the copper heat conduction foil has a heat conduction coefficient of more than 380 W / m·K.

[0021] The implementation method of the rolling mill guard plate anti-overturning limiting protection device specifically includes the following steps.

[0022] First step: a first layer of energy dissipation structure, i.e., a silicone rubber damping layer, is laid on the mounting surface of the lower roll bearing seat base body, the first layer of energy dissipation structure is fixed on the bearing seat mounting surface by bonding or bolt means, the edge of the damping layer is strictly aligned with the bearing seat, and no wrinkles are ensured during laying;

[0023] Second step: a second layer of energy dissipation structure, i.e., a copper heat conduction foil, is bonded on the back of the guard plate body, and the interlayer bubbles are removed by light pressing;

[0024] Third step: main positioning holes are arranged on the bearing seat mounting surface of the lower roll bearing seat base body, the main positioning holes are symmetrically arranged, and the main positioning holes are in clearance fit with the positioning shafts fixedly arranged on the guard plate;

[0025] Fourth step: the guard plate body is installed, bolt holes are arranged on the guard plate body, and four holes with a diameter of 18 mm are arranged;

[0026] Bolt initial fastening: 30 N·m torque is used for diagonal pre-tightening, the installation flatness is detected to be less than or equal to 0.1 mm, bolt intermediate fastening: 80 N·m torque is used for crosswise sequential fastening, assembly clearance is eliminated, and bolt final fastening: 120 N·m torque is used for clockwise sequential fastening (the plastic deformation amount of the bolt is controlled to be less than 5%).

[0027] Compared with the prior art, the present application has the following beneficial effects:

[0028] The present application completely eliminates the fracture failure caused by abnormal overturning of the guard plate, blocks the conduction path of the impact force to the roll system, and accurately controls the swing amplitude of the guard plate within the physical safety threshold range.

[0029] The present application strictly limits the vertical displacement of the guard plate to be within 10 mm±1 mm (corresponding to a swing angle of less than or equal to 3 degrees) through the cooperation clearance between the inner wall of the main positioning hole and the guard plate shaft, and the range is only 10% of the original free swing angle (about 30 degrees). BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a schematic view of the connection between the guard plate and the lower roll bearing seat base body of the present application;

[0031] Figure 2 is a partial enlarged schematic view of the present application Figure 1 .

[0032] Figure 3 is a local enlarged schematic view of the first layer energy dissipation structure of the present application;

[0033] Figure 4 is a schematic view of the A-A section of the present application Figure 3 ;

[0034] Figure 5 is a schematic view of the guard plate body and the guard plate installation of the present application;

[0035] Figure 6 is a schematic view of the main positioning hole on the lower roll bearing seat base body of the present application;

[0036] Figure 7 is a schematic view of the guard plate and the guard plate body cooperation of the present application. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0038] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0039] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0040] As shown in Figures 1-7 A rolling mill guard plate anti-overturning limiting protection device, comprising a lower roll bearing seat base body 1, a guard plate 2 is arranged on the lower roll bearing seat base body 1, the guard plate 2 is arranged on both sides of the lower roll bearing seat in pairs, the guard plate 2 is hingedly installed on the front end / rear end of the lower roll bearing seat through a rotating shaft for guiding the entry of the slab into the roll gap, comprising a mechanical rigid limiting module 3 and a dynamic damping module 4 two-stage protection body constructed on the lower roll bearing seat base body 1;

[0041] The mechanical rigid limiting module 3 controls the vertical displacement of the guard plate 2 on 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 cooperation gap between the inner wall of the main positioning hole and the guard plate shaft in the use state, the vertical displacement of the guard plate is strictly limited within 10mm±1mm, the mechanical rigid limiting module 3 includes a protective plate body 5, which is arranged on both sides of the lower roll bearing seat base 1 in pairs.

[0043] Among them, the protective plate body 5 is fixed on the lower roll bearing seat base 1 along the rolling direction by bolts, and 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 arranged on the lower roll bearing seat base 1, which controls the vertical displacement of the guard plate 2 through the cooperation gap between the main positioning hole 6 and the positioning shaft 7 arranged on the guard plate 2.

[0045] The main positioning hole 6 is arranged on the bearing seat mounting surface of the lower roll bearing seat base 1, the main positioning hole 6 is arranged symmetrically, and the main positioning hole 6 is arranged in clearance fit with the positioning shaft 8 fixed on the guard plate 2.

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

[0047] In order to facilitate the dissipation of the instantaneous heat generated by the impact in the use state, the dynamic damping module 4 includes a first layer of energy dissipation structure 9, which directly contacts the mounting surface of the lower roll bearing seat base 1, and the dynamic damping module 4 also includes a second layer of 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 on the mounting surface of the lower roll bearing seat base 1 by bonding or bolt, and the edge of the first layer of energy dissipation structure 9 is aligned with the bearing seat.

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

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

[0051] The guard plate body 5 is 650 mm±0.2 mm in length and 120 mm±0.3 mm in width, matching the mounting surface of the lower roll bearing seat base 1;

[0052] Screw holes are formed in the guard plate body 5, and four holes with a diameter of 18 mm are provided.

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

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

[0055] The second layer of energy dissipation structure 10 is a purple copper heat-conducting foil, and the second layer of energy dissipation structure 10 is a purple copper heat-conducting foil with a thickness of 1-3 mm, and the heat-conducting coefficient of the purple copper heat-conducting foil is more than 380 W / m·K.

[0056] The implementation method of the rolling mill guard plate anti-overturning limiting protection device specifically includes the following steps:

[0057] First step: lay the first layer of energy dissipation structure, i.e., the silicone rubber damping layer, on the mounting surface of the lower roll bearing seat base, and fix the first layer of energy dissipation structure on the bearing seat mounting surface by adhesion or screwing, and ensure that the edge of the damping layer is strictly aligned with the bearing seat and there is no wrinkle during laying;

[0058] Second step: adhere the second layer of energy dissipation structure, i.e., the purple copper heat-conducting foil, to the back of the guard plate body, and press gently to remove air bubbles between the layers;

[0059] Third step: the main positioning hole is formed on the bearing seat mounting surface of the lower roll bearing seat base, and the main positioning hole is symmetrically arranged, and the main positioning hole is gap-fitted with the positioning shaft fixedly arranged on the guard plate;

[0060] Fourth step: install the guard plate body, and screw holes are formed in the guard plate body, and four holes with a diameter of 18 mm are provided.

[0061] Screw initial tightening, diagonal pre-tightening with a torque of 30 Nm, detection of installation flatness≤0.1 mm, screw intermediate tightening, crosswise sequential tightening with a torque of 80 Nm, elimination of assembly gap, and screw final tightening, technical points: clockwise sequential tightening with a torque of 120 Nm (control the plastic deformation amount of the screw <5%).

[0062] It will be obvious to a person skilled in the art that the application is not limited to the details of the foregoing exemplary embodiments and can be implemented in other concrete forms without departing from the spirit or essential characteristics of the application. The embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. No reference signs in the claims should be considered as limiting the scope of the claims to the identity of the reference signs therein.

[0063] Furthermore, it should be understood that although the description is made on the basis of the embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and 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 those skilled in the art can understand.

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-rollover limit protection device for rolling mill guard plates according to claim 1, 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 selected as 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.

9. The method for implementing the anti-overturning limit protection device for rolling mill guard plates according to claim 8, characterized in that: Specifically, the steps are as follows; 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. 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. 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. 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. For initial bolt tightening, use a diagonal pre-tightening torque of 30 N·m to check the flatness of the installation to be ≤0.1 mm. For intermediate bolt tightening, use a torque of 80 N·m to tighten in a cross-shaped sequence to eliminate assembly gaps. For final bolt tightening, use a torque of 120 N·m to tighten clockwise in sequence (control the amount of bolt plastic deformation to be <5%).

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