Hot rolling mill underneath type HGC hydraulic cylinder replacing device

Abstract

The utility model discloses a hot rolling mill underneath type HGC hydraulic cylinder replacing device which comprises a replacing sliding block unit and a cross beam unit, a chain block is arranged in the replacing sliding block unit, the chain block is movably connected with the cross beam unit, and the cross beam unit is hung below the replacing sliding block unit through the chain block and can be lifted up and down. The cross beam unit comprises a lifting beam and a hoisting piece connected with the lifting beam, the hoisting piece is used for being connected with the HGC hydraulic cylinder, and the HGC hydraulic cylinder is detached from a rolling mill housing through movement of the replacement sliding block unit. Through cooperation of the replacement sliding block unit and the cross beam unit, the problems that an underneath type HGC cylinder of a hot rolling mill is large in weight, limited in installation space and complex in disassembly and replacement are solved, and the device has the advantages of being small in size, safe, reliable, time-saving and labor-saving in disassembly and assembly of the HGC cylinder and the like.

Description

Technical Field

[0001] This utility model discloses a bottom-mounted HGC hydraulic cylinder replacement device for hot rolling mills, which relates to the field of metallurgical machinery and equipment installation technology. Background Technology

[0002] The HGC hydraulic cylinder in a hot rolling mill is a key actuator in the hydraulic automatic thickness control (HAGC) system. The lower-mounted HGC cylinder is installed at the bottom of the mill archway window, between the lower support roll bearing housing and the mill foundation, and is positioned on both the drive and operating sides. Due to the harsh working environment and heavy load on the HGC hydraulic cylinder, problems such as aging and wear of seals, damage to the piston and piston rod, internal hydraulic system malfunctions, and decreased accuracy can occur, affecting normal production and requiring timely replacement.

[0003] However, replacing HGC cylinders typically requires production to be halted, and mill shutdowns significantly impact the entire production line's schedule. Therefore, the replacement must be completed as quickly as possible. Furthermore, the lower-mounted HGC cylinder is installed on the base plate of the mill stand. Before removal, the protective cover, step pads, and other devices above it must be removed. Thus, the dismantling equipment must also be capable of lifting the protective cover and step pads. Additionally, the space around the mill stand is limited during HGC cylinder replacement, making it difficult to operate conventional overhead cranes and tooling, hindering lifting, dismantling, and installation. Therefore, the dismantling equipment must be small enough to enter the stand frame for lifting. Moreover, the lower-mounted hot rolling mill HGC cylinder is quite heavy, typically weighing 15 tons or even over 25 tons, requiring high lifting capacity and stability from the hoisting equipment. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a bottom-mounted HGC hydraulic cylinder replacement device for hot rolling mills, ensuring fast, safe, and stable cylinder replacement.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0006] A bottom-mounted HGC hydraulic cylinder replacement device for a hot rolling mill includes a replacement slide block unit and a crossbeam unit. The replacement slide block unit has a built-in hand chain hoist, which is movably connected to the crossbeam unit. The crossbeam unit is suspended below the replacement slide block unit by the hand chain hoist and can be raised and lowered. The crossbeam unit includes a lifting beam and a connected lifting component. The lifting component is used to connect with the HGC hydraulic cylinder. The HGC hydraulic cylinder is removed from the mill stand by moving the replacement slide block unit.

[0007] Furthermore, the slider replacement unit includes a car change frame, a hand chain hoist, and a fixed seat. The car change frame is connected to the hand chain hoist, and a crossbeam unit is hung directly below the hand chain hoist. The bottom of the car change frame has support legs, and the fixed seat is installed on the support legs of the car change frame to cooperate with the roller changing trolley. A connecting pin is provided on the support legs of the car change frame, and its position is matched with the pin hole of the maintenance platform.

[0008] Furthermore, the top of the car change frame is equipped with eye bolts, and wear-resistant plates are installed on the sliding surfaces on both sides of the car change frame support legs for guide rail fit.

[0009] Furthermore, the hand chain hoists are installed as a group, symmetrically on the vehicle changing frame, and the connecting pins are symmetrically installed on the support legs of the vehicle changing frame, with positioning holes provided on the connecting pins.

[0010] Furthermore, the fixing seat is installed on the support leg of the roller changing frame by screws. Its front end has a Y-shaped groove with an annular groove inside, so as to be used with the mushroom head of the roller changing trolley.

[0011] Furthermore, the top of the lifting beam is equipped with a pin for connection with a hand chain hoist. The lifting beam includes left and right crossbeams, and bolt through holes are opened on the left and right crossbeams to install screws 2.6 for connection with the lifting holes of the lower elevation adjustment device frame.

[0012] Furthermore, the lifting components connected to the lifting beam include chain hooks, with eye bolts connected to both ends of the chain hooks. One set of eye bolts is symmetrically installed on the lifting beam, and two sets of eye bolts are used to connect to the protective cover and the lifting hole of the step pad of the HGC cylinder lower elevation adjustment device.

[0013] This utility model discloses a replacement device for a bottom-mounted HGC hydraulic cylinder in a hot rolling mill, which solves the problems of large weight, limited installation space, and complex disassembly and replacement of bottom-mounted HGC cylinders in hot rolling mills. It has the advantages of small size, comprehensive functions, safety and reliability, and time and labor saving. This utility model is applicable to the disassembly and replacement of bottom-mounted HGC hydraulic cylinders in hot rolling mills in the field of metallurgical machinery and equipment installation technology, ensuring fast, safe and stable replacement of hydraulic cylinders. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the disassembly of the lower-mounted HGC hydraulic cylinder of this utility model.

[0015] Figure 2 This is a perspective view of the replaceable slider unit of this utility model.

[0016] Figure 3 This is a front view of the slider replacement unit of this utility model.

[0017] Figure 4 This is a schematic diagram of the crossbeam unit of this utility model.

[0018] Figure 5 This is a schematic diagram of the vehicle replacement frame of this utility model.

[0019] Figure 6 This is a perspective view of the fixing base of this utility model.

[0020] Figure 7 This is a schematic diagram of the fixing base of this utility model.

[0021] Figure 8 yes Figure 7 Sectional view along the AA direction.

[0022] Figure 9 This is a schematic diagram of a maintenance platform used during implementation.

[0023] In the diagram: 1. Replacement of the slider unit; 2. Crossbeam unit; 3. Maintenance platform;

[0024] 1.1 Replacement frame; 1.2 Hand chain hoist; 1.3 Mounting bracket; 1.4 Connecting pin; 1.5 Wear-resistant plate;

[0025] 2.1 Lifting beam; 2.2 A set of second eye bolts; 2.3 Chain hook; 2.4 Two sets of third eye bolts; 2.5 Pin; 2.6 Screw. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings:

[0027] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention and are mainly used to illustrate the embodiments, and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0028] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0030] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] Please see Figures 1 to 9 This embodiment discloses a bottom-mounted HGC hydraulic cylinder replacement device for hot rolling mills. Its main purpose is to achieve rapid, safe, and stable replacement of HGC hydraulic cylinders in rolling mills, thereby saving manpower and improving maintenance efficiency. This utility model discloses a bottom-mounted HGC hydraulic cylinder replacement device for hot rolling mills, comprising a replacement slider unit 1 and a crossbeam unit 2. The replacement slider unit 1 has a built-in hand chain hoist 1.2, which is movably connected to the crossbeam unit 2. The crossbeam unit 2 can be raised and lowered below the replacement slider unit via the hand chain hoist 1.2. The crossbeam unit 2 includes a lifting beam 2.1 and a connected lifting component. The lifting component is used to connect with the HGC hydraulic cylinder. The HGC hydraulic cylinder is disassembled from the rolling mill stand M by moving the replacement slider unit 1. The lifting component can be a chain hook-operated eye bolt, or it can be a bolt set on the left and right crossbeams. The lifting component can also be a connecting component with similar functions.

[0032] In one embodiment of this utility model, as follows: Figure 2 , Figure 3 , Figure 5 In this system, the slider replacement unit 1 includes a roller changing frame 1.1, a manual hoist 1.2, and a fixing seat 1.3. The roller changing frame 1.1 is connected to the manual hoist 1.2, and a crossbeam unit 2 is suspended directly below the manual hoist 1.2. The bottom of the roller changing frame 1.1 has support legs, and the fixing seat 1.3 is installed on the support legs of the roller changing frame to cooperate with the roller changing trolley. A connecting pin 1.4 is provided on the support legs of the roller changing frame, and its position is matched with the pin hole of the maintenance platform. The manual hoists 1.2 are arranged in a group and symmetrically installed on the roller changing frame 1.1. The connecting pins 1.4 are symmetrically installed on the support legs of the roller changing frame, and the connecting pins 1.4 are provided with positioning holes. The specific installation and function of each component are described in detail below.

[0033] In one embodiment of this utility model, as follows: Figure 4 As shown, the top of the lifting beam 2.1 is provided with a pin 2.5 for connecting with the hand chain hoist 1.2. The lifting beam 2.1 includes left and right crossbeams, and bolt through holes are opened on the left and right crossbeams to install screws 2.6 for connecting with the lower elevation adjustment device frame hoisting holes.

[0034] After completing the preparatory work, the disassembly of the hydraulic cylinder begins, such as... Figures 1 to 9 As shown:

[0035] First, the replacement device and maintenance platform 3 are hoisted to the rolling mill operating side by the workshop crane, and the front and rear support legs of the maintenance platform and the car changing frame 1.1 of the replacement slider unit 1 are accurately placed on the roll changing guide rail. The maintenance platform is located between the roll changing trolley and the replacement device, and plays the role of front and rear connection.

[0036] 2. Connect the roller changing trolley to the maintenance platform, and push the maintenance platform so that its pin hole mates with the connecting pin 1.4 of the roller changing frame 1.1. Then, push the changing device above the HGC cylinder using the roller changing trolley.

[0037] 3. Adjust the height of the crossbeam unit 2 using the hand chain hoist 1.2 so that the third lifting eye screw 2.4 on the crossbeam unit 2 can be connected to the protective cover and step pad of the HGC cylinder lower elevation adjustment device. Pull the hand chain hoist 1.2 to lift the step pad and protective cover in sequence, and then pull them out of the rolling mill stand in sequence by the roll changing trolley. Then disconnect them and finally lift them away by the workshop crane to complete the preparation work before the HGC cylinder replacement.

[0038] Fourth, push the replacement device above the HGC cylinder again, adjust the position of the crossbeam unit 2 by using the hand chain hoist 1.2, fix the crossbeam unit 2 to the lower elevation adjustment device frame with screws 2.6, then raise the crossbeam unit 2 to the height at which the HGC cylinder can be transported out of the mill window, and then pull it out of the mill mill through the roll changing trolley and maintenance platform, and transport it to the roll chamber.

[0039] 5. Adjust the height of the crossbeam unit 2 using the hand chain hoist 1.2 to smoothly lower the HGC cylinder onto the ground I-beam. Then disconnect the connection between the replacement device, the lower elevation adjustment device frame, and the HGC cylinder so that the workshop crane can lift the HGC cylinder to the maintenance position.

[0040] VI. The installation steps for the new hydraulic cylinder shall be performed in reverse order of the disassembly steps described above.

[0041] 7. If only the operating side HGC cylinder is being replaced, the replacement unit can be directly connected to the roll changing trolley, and the maintenance platform is not required in the above steps. (Due to the limited travel of the roll changing trolley, a maintenance platform is required for transitional connection when replacing the drive side HGC cylinder.) Figure 1The Chinese character is represented by the symbol N.

[0042] In order for the hydraulic cylinder disassembly and replacement device to achieve the above-described working process, such as Figures 1 to 9 As shown, the manufacturing and installation requirements for each component of this device are as follows:

[0043] 1. The replacement device includes replacing the slider unit 1 and the crossbeam unit 2. The replacement device is small enough to be installed inside the rolling mill stand.

[0044] II. The replacement slider unit 1 includes a car change frame 1.1, a hand chain hoist 1.2, a connecting pin 1.4, and a fixing seat 1.3. The top of the car change frame 1.1 is equipped with a first lifting eye screw 1.11 for crane lifting in the workshop. The bottom of the support legs of the car change frame 1.1 is equipped with wear-resistant plates 1.5 to allow it to slide smoothly on the guide rail. The hand chain hoist 1.2 is symmetrically installed inside the car change frame 1.1, and the crossbeam unit 2 is suspended directly below it. The position and height of the crossbeam unit 2 can be adjusted by the hand chain hoist 1.2.

[0045] 3. The fixed seat 1.3 is installed on the support leg of the roll changing frame 1.1 with screws. Its front end has a Y-shaped groove 1.31 and an annular groove 1.32 inside to cooperate with the mushroom head of the roll changing trolley. The connecting pins 1.4 are symmetrically installed on the support legs of the roll changing frame 1.1, and their positions are exactly matched with the pin holes 3.1 of the maintenance platform. They are connected with safety pins 3.2, so that the changing device can enter and exit the rolling mill stand through the maintenance platform.

[0046] IV. The crossbeam unit 2 includes a lifting beam 2.1, a second eye bolt 2.2, a chain hook 2.3, and a pin 2.5. The pins 2.5 are symmetrically mounted on the upper end of the lifting beam 2.1 for connection to the hand chain hoist 1.2. Bolt through holes are opened on the left and right crossbeams of the lifting beam 2.1, the position and size of which precisely match the hoisting holes of the lower elevation adjustment device frame, allowing the crossbeam unit 2 to lift the lower elevation adjustment device frame and the HGC cylinder via bolts 2.6. One end of the chain hook 2.3 connects to the second eye bolt 2.2, and the other end connects to the third eye bolt 2.4. A set of second eye bolts 2.2 are symmetrically mounted on the lifting beam 2.1, and two sets of third eye bolts 2.4 can connect to the hoisting holes of the protective cover and step pad of the HGC cylinder lower elevation adjustment device. The crossbeam unit 2 can be disassembled from the rolling mill stand using this connection method.

[0047] The above description is merely an embodiment of the invention's technical content. Any modifications or variations made by those skilled in the art using this invention are within the scope of the invention's claims, and are not limited to those disclosed in the embodiments.

Claims

1. A bottom-mounted HGC hydraulic cylinder replacement device for hot rolling mills, characterized in that: The system includes a slider replacement unit and a crossbeam unit. The slider replacement unit has a built-in hand chain hoist, which is movably connected to the crossbeam unit. The crossbeam unit is suspended below the slider replacement unit by the hand chain hoist and can be raised and lowered. The crossbeam unit includes a lifting beam and a connected lifting component. The lifting component is used to connect to the HGC hydraulic cylinder. The HGC hydraulic cylinder is removed from the rolling mill stand by moving the slider replacement unit.

2. The hot rolling mill bottom-mounted HGC hydraulic cylinder replacement device according to claim 1, characterized in that: The slider replacement unit includes a car change frame, a hand chain hoist, and a fixed seat. The car change frame is connected to the hand chain hoist, and a crossbeam unit is hung directly below the hand chain hoist. The bottom of the car change frame has support legs. The fixed seat is installed on the support legs of the car change frame to cooperate with the roller changing trolley. A connecting pin is provided on the support legs of the car change frame, and its position is matched with the pin hole of the maintenance platform.

3. The hot rolling mill bottom-mounted HGC hydraulic cylinder replacement device according to claim 2, characterized in that: The top of the frame is equipped with eye bolts, and wear-resistant plates are installed on the sliding surfaces on both sides of the frame support legs for guide rail fit.

4. The hot rolling mill bottom-mounted HGC hydraulic cylinder replacement device according to claim 2, characterized in that: The hand chain hoists are installed as a set, symmetrically on the vehicle changing frame. The connecting pins are symmetrically installed on the support legs of the vehicle changing frame, and the connecting pins are provided with positioning holes.

5. A hot rolling mill bottom-mounted HGC hydraulic cylinder replacement device according to claim 2, characterized in that: The mounting bracket is installed on the support leg of the roller changing frame with screws. It has a Y-shaped groove at the front end and an annular groove inside to match the mushroom head of the roller changing trolley.

6. The hot rolling mill bottom-mounted HGC hydraulic cylinder replacement device according to claim 1, characterized in that: The top of the lifting beam is equipped with a pin for connection with a hand chain hoist. The lifting beam includes left and right crossbeams, and bolt through holes are opened on the left and right crossbeams for installing screws for connection with the lower elevation adjustment device frame hoisting holes.

7. A hot rolling mill bottom-mounted HGC hydraulic cylinder replacement device according to claim 1 or 6, characterized in that: The lifting components connected to the lifting beam include chain hooks, with eye bolts connected to both ends of the chain hooks. One set of eye bolts is symmetrically installed on the lifting beam, and two sets of eye bolts are used to connect to the protective cover and the lifting hole of the step pad of the HGC cylinder lower elevation adjustment device.

Images