Method and tooling for replacing a hydraulic cylinder of a rolling mill

Abstract

The application discloses a method and a tool for replacing a hydraulic cylinder of a rolling mill, and the method and the tool for replacing the hydraulic cylinder replace the replacement scheme of arranging too many replacement auxiliary devices in a cramped operation space by utilizing the existing equipment of the rolling mill to a certain extent in the whole process, reduce operation steps, and the replacement tool body used in the replacement method is compact in structure, simple in operation and maintenance, automatic positioning in the process of replacing the hydraulic cylinder can be realized, and the replacement efficiency of the hydraulic cylinder is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rolling mill operating equipment, in particular to a method and tool for replacing a hydraulic cylinder of a screwdown rolling mill. BACKGROUND

[0002] At present, it is common to use AGC hydraulic cylinders as a means for adjusting the rolling line elevation and opening degree of a rolling mill. The screwdown AGC hydraulic cylinder is installed on the upper part of the mill stand opening. During the operation of the rolling mill, the AGC hydraulic cylinder is exposed to an extremely harsh working environment of high temperature radiation and cooling water mist dispersion. In order to ensure the accuracy of the hydraulic cylinder and control the product quality, the AGC hydraulic cylinder needs to be regularly overhauled and replaced.

[0003] At present, the replacement method of the AGC hydraulic cylinder of the rolling mill used in the steel plant is relatively complex. Most of them need to set up a cylinder replacement carriage separately. The replacement process often needs several operators to simultaneously control the hoisting mechanism, the carriage and the cage, and is completed by the cooperation of multiple stations and devices, which consumes a lot of manpower and time. In some places where the equipment is arranged compactly and the space is relatively cramped, the corresponding auxiliary replacement equipment is difficult to arrange, resulting in great difficulty in replacing the AGC hydraulic cylinder of the rolling mill. SUMMARY

[0004] In view of the defects in the prior art, the present application provides a method and tool for replacing a hydraulic cylinder of a screwdown rolling mill to solve the problems of difficulty and complexity in replacing the hydraulic cylinder in the working area of the rolling mill in the prior art.

[0005] The above-mentioned object of the present application is mainly achieved by the following technical solutions:

[0006] A method for replacing a hydraulic cylinder of a screwdown rolling mill, comprising the following steps:

[0007] Moving the rolling mill roll system out of the rolling mill working position and removing the upper roll system;

[0008] Installing a replacement platform on the lower roll system and moving the lower roll system into the rolling mill working position;

[0009] Dismounting the sensors connected to the upper part of the hydraulic cylinder and extending the hoisting rod into the sensor connection hole to connect with the sensor connecting rod;

[0010] Dismounting the fixing bolts on the hydraulic cylinder and operating the hoisting rod to lower the hydraulic cylinder onto the replacement platform, and separating the hoisting rod from the sensor connecting rod;

[0011] Moving the lower roll system out of the rolling mill working position and replacing the hydraulic cylinder.

[0012] Further, before dismounting the fixing bolts on the hydraulic cylinder, a pre-tension is applied to the hoisting rod.

[0013] Further, the rolling mill roller system comprises an upper roller system and a lower roller system, the lower roller system carries the upper roller system, and the lower roller system is driven to move by a roller changing trolley.

[0014] Further, one end of the lifting rod is connected with a lifting mechanism, and the lifting rod can be driven to move or lift by the lifting mechanism.

[0015] Further, the hydraulic cylinder after replacement or maintenance is placed on the replacement platform, and is moved into the rolling mill working position together with the lower roller system, is connected with the sensor connecting rod through the sensor connecting hole, is lifted to the rack installation position by operating the lifting mechanism, and the lifting rod is removed after the installation of the hydraulic cylinder fixing bolt, and the hydraulic cylinder is reset.

[0016] Based on the same inventive concept, the application further provides a tool for replacing a hydraulic cylinder, comprising the lifting rod and the replacement platform, one end of the lifting rod is used for connecting with the lifting mechanism, and the other end is used for being threadedly connected with the sensor connecting rod, and the two ends of the replacement platform are respectively provided with an installation position for connecting with the lower roller system and a supporting position for supporting the hydraulic cylinder.

[0017] Further, the replacement platform is fixed with the lower roller system bearing seat through bolts, and when the replacement platform is fixed on the lower roller system, the hydraulic cylinder can fall vertically onto the supporting position.

[0018] Further, the installation position is provided with a positioning hole, and the positioning hole is used for cooperating with a positioning column between the upper roller system and the lower roller system.

[0019] Further, the replacement platform is provided with a protection rod, the protection rod comprises a fixed section, an unfolding section and a locking rod, the fixed section is fixedly arranged on the replacement platform, the unfolding section is movably arranged on the fixed end and can move along the length direction of the fixed section, and the fixed section and the unfolding section are provided with a plurality of locking holes for the locking rod to pass through.

[0020] Further, the side wall of the lifting rod is provided with a clamping plane for clamping rotation.

[0021] Compared with the prior art, the application has the following advantages:

[0022] In the present application, when the hydraulic cylinder needs to be replaced, the mill roller system is first moved out of the mill working position, the upper roller system is removed, and a replacement platform is installed on the lower roller system. Then the lower roller system is moved into the mill working position, the sensor connecting rod on the upper part of the hydraulic cylinder is disassembled, the hoisting rod is extended into the sensor connecting hole and connected with the sensor connecting rod, after the fixing bolts on the hydraulic cylinder are disassembled, the hoisting rod is operated to drive the hydraulic cylinder to descend onto the replacement platform, the hoisting rod and the sensor connecting rod are separated, the lower roller system is moved out of the mill working position, and the hydraulic cylinder is replaced. The whole process replaces the replacement scheme of arranging too many replacement auxiliary equipment in a cramped working space by using the existing equipment of the mill to a certain extent, reduces the operation steps, and the replacement tool body used in the replacement method is compact in structure, easy to operate and maintain, can realize automatic positioning during the replacement of the hydraulic cylinder, improves the replacement efficiency of the hydraulic cylinder, and only two or three operators are needed to complete the whole replacement operation process. Compared with the traditional way of setting up a sliding frame to specific operation, the manpower investment is greatly saved. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0024] Fig. 1 The structural schematic diagram of the hydraulic cylinder replacement process provided by the embodiment of the present application is shown in the figure.

[0025] Fig. 2 The structural schematic diagram of the protection rod in the expanded state provided by the embodiment of the present application is shown in the figure.

[0026] In the figure: 1, hoisting rod; 2, replacement platform; 21, positioning hole; 22, bolt; 23, protection rod; 24, fixed section; 25, expanded section; 26, locking rod; 31, sensor connecting rod; 32, sensor connecting hole; 4, hydraulic cylinder; 5, hoisting mechanism; 6, rack. DETAILED DESCRIPTION

[0027] The present application will be further described below in combination with the drawings and specific embodiments. It should be noted that the description of these embodiment modes is used to help understand the present application, but does not constitute a limitation on the present application. The specific structural and functional details disclosed herein are only used to describe the example embodiments of the present application. However, the present application can be embodied in many alternative forms, and should not be understood as being limited in the embodiments described herein.

[0028] As shown in Figs. 1-2 A method for replacing a hydraulic cylinder 4 of a screwdown mill, comprising the following steps:

[0029] The mill roll system is moved out of the mill working position, and the upper roll system is removed, since the mill roll system is provided with operation equipment for moving out and moving in, therefore, no additional operation equipment is needed during the operation process of this step, which reduces the learning cost and operation cost of the operator, and the operator can quickly and safely move the mill roll system from the working position of the mill to the stop operation position outside the mill without additional learning, so that the operator can operate the mill roll system in a relatively safe and convenient working position, and after the mill roll system is moved out of the mill working position, the mill roll system is separated from the rack 6 of the mill, that is, the top of the mill roll system is no longer limited by the rack 6 or the pressing device, at this time, the upper roll system is removed by the dismounting equipment of the upper roll system, that is, the upper roll system is separated from the lower roll system.

[0030] The replacement platform 2 is installed on the lower roll system, and the lower roll system is moved into the mill working position, the replacement platform 2 serves as a support mechanism on one hand, providing support for the hydraulic cylinder 4 to be replaced and the hydraulic cylinder 4 after replacement, reducing the support responsibility of other mechanisms, avoiding manual intervention and direct contact with the hydraulic cylinder 4, improving operation safety, on the other hand, the replacement platform 2 serves as an operation standing platform for the operator, facilitating the operator to move and operate on the replacement platform 2, after the installation of the replacement platform 2, the operator can obtain a stable moving area on the lower roll system by using the replacement platform 2, avoiding the movement of the operator on the lower roll system and reducing the risk of falling of the operator.

[0031] The sensor connected to the upper part of the hydraulic cylinder 4 is dismounted, and the lifting rod 1 is extended into the sensor connecting hole 32 to be connected with the sensor connecting rod 31, the sensor is connected to the top of the hydraulic cylinder 4 for monitoring the operation state of the hydraulic cylinder 4 and the pressure data of the mill roll system, in order to facilitate the dismounting and data transmission of the sensor, a through sensor connecting hole 32 is opened in the rack 6 area of the upper part of the sensor, and a sensor connecting rod 31 is installed in the sensor connecting hole 32, the sensor connecting rod 31 is fixedly connected with the sensor, and the sensor connecting rod 31 is detachably connected with the sensor, the sensor is installed in the sensor connecting hole 32 in the working state, the specific operation is to dismount the sensor first, install the lifting rod 1 at the installation position of the sensor, and fix the lifting rod 1 with the sensor connecting rod 31.

[0032] The fixing bolt between the hydraulic cylinder 4 and the rack is dismounted, and the lifting rod 1 is operated to lower the hydraulic cylinder 4 to the replacement platform 2, and the lifting rod 1 is separated from the sensor connecting rod 31, at this time, the hydraulic cylinder 4 is dismounted and placed on the replacement platform 2.

[0033] The lower roll system is moved out of the mill working position, and the hydraulic cylinder 4 is replaced, by moving the lower roll system, the replacement platform 2 and the hydraulic cylinder 4 are also moved.

[0034] The working principle of the embodiment is that when the hydraulic cylinder 4 needs to be replaced, the rolling mill roll system is first moved out of the rolling mill working position, the replacement platform 2 is installed on the lower roll system after the upper roll system is removed, the lower roll system is moved into the rolling mill working position, the sensor connected to the upper part of the hydraulic cylinder 4 is disassembled, the hoisting rod 1 is extended into the sensor connecting hole 32 and connected with the sensor connecting rod 31, after the fixing bolts on the hydraulic cylinder 4 are disassembled, the hoisting rod 1 is operated to drive the hydraulic cylinder 4 to descend to the replacement platform 2, the lower roll system is moved out of the rolling mill working position after the hoisting rod 1 is separated from the sensor connecting rod 31, and the hydraulic cylinder 4 is replaced, the whole process replaces the replacement scheme of arranging too many replacement auxiliary devices in a cramped working space to a certain extent by using the existing equipment of the rolling mill, reduces the operation steps, in large rolling equipment, each component is very heavy, and the manually intervened component can only be a small and easily operated part, correspondingly, it is very difficult to manually install auxiliary disassembly equipment on or around the rolling mill, and the installed equipment needs to have the structural performance of bearing the roll system and the hydraulic cylinder 4, which has very high requirements for the stability of the disassembly and assembly of the auxiliary equipment, the rigidity of the structure itself, and the convenience of the connection with the rolling mill, the replacement method provided in the application uses a compact replacement tool body structure, is simple to operate and maintain, can realize automatic positioning in the replacement process of the hydraulic cylinder 4, improves the replacement efficiency of the hydraulic cylinder 4, and in addition, only two or three operators are needed to successfully complete the whole replacement operation process, compared with the traditional way from setting up a sliding frame to specific operation, the human input is greatly saved.

[0035] Further, on the basis of the above embodiment, a pre-tension is applied to the hoisting rod 1 before the fixing bolts on the hydraulic cylinder 4 are disassembled, in order to improve the ability of the hoisting rod 1 to stably hoist the hydraulic cylinder 4 and avoid unpredictable falling of the hydraulic cylinder 4 in the process of disassembling the hydraulic cylinder 4, by applying the pre-tension in advance, the hoisting rod 1 drives the hydraulic cylinder 4 to tightly adhere to the installation position of the hydraulic cylinder 4 upward, under the premise of maintaining the pre-tension, the disassembly of the fixing bolts can be more labor-saving, and the stability of the hydraulic cylinder 4 can also be maintained, avoiding a certain degree of falling and improving the operation safety.

[0036] Further, on the basis of the above embodiment, the rolling mill roll system includes an upper roll system and a lower roll system, the lower roll system bears the upper roll system, and the lower roll system moves under the drive of a roll changing trolley, in order to improve the stability of the installation of the upper roll system on the lower roll system and avoid displacement between the upper roll system and the lower roll system, the stability is improved.

[0037] Further, on the basis of the above embodiment, one end of the hoisting rod 1 is connected with a hoisting mechanism 5 and moves or rises and falls under the drive of the hoisting mechanism 5, so as to hoist or disassemble the upper roll system, the replacement platform 2 or operate the hoisting rod 1 to rise and fall.

[0038] Further, on the basis of the above-mentioned embodiments, the replaced or overhauled hydraulic cylinder 4 moves with the replacement platform 2 and the lower roller system until the lower roller system moves into the rolling mill working position, is connected to the sensor connecting rod 31 again through the hoisting rod 1 passing through the sensor connecting hole 32, the hoisting rod 1 is operated to lift the hydraulic cylinder 4 and fix the hydraulic cylinder 4 on the rack 6, then the hoisting rod 1 is removed, the lower roller system is driven to move out of the rolling mill working position, and after the upper roller system is installed on the lower roller system, the rolling mill roller system is moved into the rolling mill working position, and the operation preparation after replacing the hydraulic cylinder 4 is completed.

[0039] Based on the same inventive concept, the application also provides a tool for replacing the hydraulic cylinder 4, which comprises the above-mentioned hoisting rod 1 and replacement platform 2, one end of the hoisting rod 1 is used to connect the hoisting mechanism 5, the other end is used to be screwed with the sensor connecting rod 31, and the two ends of the replacement platform 2 are respectively provided with a mounting position for connecting the lower roller system and a supporting position for supporting the hydraulic cylinder 4.

[0040] Further, on the basis of the above-mentioned embodiments, the replacement platform 2 is fixed between the lower roller system bearing seat through the positioning bolt 22, and when the replacement platform 2 is fixed on the lower roller system bearing seat and follows the lower roller system into the rolling mill working position, the supporting position of the replacement platform 2 is directly below the hydraulic cylinder 4 mounting position. Further, on the basis of the above-mentioned embodiments, the mounting position is provided with a positioning hole 21, which is used to cooperate with the positioning column between the upper roller system and the lower roller system to improve the stability and accuracy of the connection.

[0041] Further, on the basis of the above-mentioned embodiments, the replacement platform 2 is provided with a protective rod 23, the protective rod 23 comprises a fixed section 24, an unfolding section 25 and a locking rod 26, the fixed section 24 is fixedly arranged on the replacement platform 2, the unfolding section 25 is movably arranged on the fixed end and can move along the length direction of the fixed section 24, and a plurality of locking holes are arranged on the fixed section 24 and the unfolding section 25 for the locking rod 26 to pass through. The replacement platform 2 needs manual operation, which has certain risk of falling. In order to maintain the safety of operation, the protective fence is added on the replacement platform 2 to prevent the operator from accidentally falling.

[0042] Due to the certain limitation of the height position of the rolling mill roller system, and the certain limitation of the height position of the rack 6 of the rolling mill in the process of moving the lower roller system in and out, the movable connection relationship between the fixed end and the unfolding section 25 makes it possible to directly unfold the unfolding section 25 from the fixed end when the space condition is limited, and the unfolding section 25 can be folded onto the fixed section 24 in the process of moving the lower roller system, which maintains the stable passability and can also improve the overall height of the protective rod 23, further ensuring the safety of the operator's operation.

[0043] Specifically, a containing space can be arranged in the fixed section 24, and the unfolding section 25 can move along the length direction in the containing space.

[0044] Further, on the basis of the above embodiment, the hoisting rod 1 side wall has a clamping plane for clamping rotation.

[0045] It should be understood that the terms first, second, etc. are only used to distinguish descriptions, and cannot be understood as indicating or implying relative importance. Although the terms first, second, etc. can be used herein to describe various units, these units should not be limited by these terms. These terms are only used to distinguish one unit from another unit. For example, the first unit can be called the second unit, and similarly the second unit can be called the first unit, without departing from the scope of the example embodiments of the present application.

[0046] It should be understood that the term "and / or" herein only describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases of A alone, B alone, and A and B together. The term "and" herein describes another association relationship of the associated objects, which means that there can be two relationships, for example, A and B, which means that there are two cases of A alone and A and B together. In addition, the character " / " herein generally indicates that the associated objects before and after are an "or" relationship.

[0047] It should be understood that in the description of the present application, the terms "upper", "vertical", "inner", "outer" and the like indicate the orientation or positional relationship of the disclosed product when it is commonly placed, or the orientation or positional relationship commonly understood by those skilled in the art, 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.

[0048] In the description of the present application, it should be further pointed out that, unless otherwise explicitly specified and limited, the terms "arrangement", "installation", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0049] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments of the application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises", "comprising", "includes" and / or "including" when used herein, specify the presence of stated features, integers, steps, operations, elements, and / or components but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0050] In the following description, specific details are set forth to provide a thorough understanding of example embodiments. However, persons having ordinary skill in the art will appreciate that example embodiments can be practiced without some or all of the specific details. In other instances, well known process steps have not been described in detail in order to avoid obscuring the example embodiments.

[0051] The particular embodiments described herein illustrate the application more fully. Many modifications and variations will be apparent to those skilled in the art upon reading this disclosure. It is intended that all such modifications and variations be included with this disclosure and covered by the appended claims. The particular embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the application.

Claims

1. A method of replacing a hydraulic cylinder of a rolling mill, characterized in that, It comprises the following steps: Moving the roll system out of the rolling mill working position and removing the upper roll system; Assembling the replacement platform on the lower roll system and moving the lower roll system into the rolling mill working position; Dismantling the sensor connected to the upper part of the hydraulic cylinder and connecting the hoisting rod to the sensor connecting rod through the sensor connecting hole, one end of the hoisting rod being connected to the hoisting mechanism and being movable or liftable under the drive of the hoisting mechanism; Dismantling the fixing bolt on the hydraulic cylinder and lowering the hydraulic cylinder onto the replacement platform under the drive of the hoisting rod, and disconnecting the hoisting rod from the sensor connecting rod; Moving the lower roll system out of the rolling mill working position and replacing the hydraulic cylinder; the replaced or repaired hydraulic cylinder is placed on the replacement platform and moved into the rolling mill working position together with the lower roll system, connected to the sensor connecting rod through the hoisting rod passing through the sensor connecting hole, and lifted to the rack mounting position under the drive of the hoisting mechanism, the hoisting rod being removed after the installation of the fixing bolt of the hydraulic cylinder, and the hydraulic cylinder being reset.

2. The method of replacing a hydraulic cylinder of a rolling mill according to claim 1, characterized in that: A pre-tension is applied to the hoisting rod before the fixing bolt on the hydraulic cylinder is dismantled.

3. The method of replacing a hydraulic cylinder of a screw-down mill as claimed in claim 1, characterized in that: The rolling mill roll system comprises an upper roll system and a lower roll system, the lower roll system bearing the upper roll system, and the lower roll system being movable under the drive of the roll changer trolley.

4. A tooling for replacing a hydraulic cylinder, characterized by: The tooling is applied to the method according to any one of claims 1-3, the tooling comprising a hoisting rod and a replacement platform, one end of the hoisting rod being used to connect to the hoisting mechanism and the other end being used to threadedly connect to the sensor connecting rod, and the replacement platform being provided with a mounting position for connecting to the lower roll system and a supporting position for supporting the hydraulic cylinder at two ends thereof.

5. The tooling for replacing a hydraulic cylinder of claim 4, wherein: The replacement platform is fixed to the lower roll system bearing seat through bolts, and when the replacement platform is fixed to the lower roll system, the hydraulic cylinder can fall vertically onto the supporting position.

6. The tooling for replacing a hydraulic cylinder of claim 4, wherein: The mounting position is provided with a positioning hole for cooperating with the positioning column between the upper roll system and the lower roll system.

7. The tooling for replacing a hydraulic cylinder of claim 4, wherein: The replacement platform is provided with a protection rod, the protection rod comprising a fixed section, an unfolding section and a locking rod, the fixed section being fixedly arranged on the replacement platform, the unfolding section being movably arranged on the fixed section and being movable along the length direction of the fixed section, and the fixed section and the unfolding section being provided with a plurality of locking holes for the locking rod to pass through.

8. The tooling for replacing a hydraulic cylinder of claim 4, wherein: The side wall of the hoisting rod is provided with a clamping plane for clamping rotation.

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