A quick replacement device for AGC hydraulic cylinder of wide and thick plate rolling mill

Abstract

The utility model discloses a kind of wide and thick plate rolling mill AGC hydraulic cylinder quick replacement device, belong to metallurgical machinery equipment maintenance technical field, its technical scheme is, the device includes rectangle horizontal base plate, the base plate is arranged between the upper supporting roll of wide and thick plate rolling mill and AGC hydraulic cylinder, the bottom of base plate is equipped with the base plate positioning mechanism corresponding with the upper supporting roll equalizing plate of each bearing seat top of upper supporting roll of base plate, the top of base plate is equipped with the hydraulic cylinder positioning mechanism matched with each AGC hydraulic cylinder.The utility model realizes the quick positioning between base plate and AGC hydraulic cylinder by hydraulic cylinder positioning mechanism, realizes the quick positioning between base plate and upper supporting roll by base plate positioning mechanism, with simple structure, easy operation, safety, positioning precision higher advantage, using the device can prevent AGC hydraulic cylinder from deflection in installation process, reduce the replacement difficulty of AGC hydraulic cylinder, improve equipment maintenance efficiency.

Description

Technical Field

[0001] This utility model relates to a quick replacement device for the hydraulic cylinder of the AGC in a heavy plate rolling mill, belonging to the field of metallurgical machinery and equipment maintenance technology. Background Technology

[0002] The AGC hydraulic cylinder in a heavy plate rolling mill is the core actuator of its automatic thickness control system (see...). Figure 13 , Figure 14 and Figure 15 This system can precisely control the roll gap and steel plate thickness using sensor signals. It boasts advantages such as fast response speed and high control precision. It can dynamically compensate for disturbances during the rolling process, and in real time compensate for interference such as rolling force fluctuations, roll eccentricity, and thickness deviations at the beginning and end of the steel plate, ensuring uniform and stable thickness throughout the entire length of the steel plate. This plays a crucial role in improving product precision and yield.

[0003] During frequent use, the AGC hydraulic cylinder 001 may experience wear and oil leaks, which not only damages the oil system but also negatively impacts the control accuracy of the rolling mill. Therefore, the AGC hydraulic cylinder 001 must be replaced immediately upon damage. Because the AGC hydraulic cylinder 001 for heavy plate rolling mills is large and heavy, and is typically installed between the bearing housing of the upper support roll 002 and the pressing screw directly below the inside of the rolling mill stand 003 (the upper end of the AGC hydraulic cylinder 001 is fixedly connected to the rolling mill stand 003, and the lower end is opposite to the upper support roll 002), it cannot be directly hoisted. Furthermore, the installation location is high above the ground, and the working space is limited, making the replacement of the AGC hydraulic cylinder 001 difficult and time-consuming.

[0004] In existing methods for replacing AGC hydraulic cylinder 001, it is typically placed above the bearing seat of the upper support roller 002, and pulled out and pushed into the mill stand 003 by pulling and pushing the upper support roller 002. However, since there is no constraint on the AGC hydraulic cylinder 001 above the bearing seat of the upper support roller 002, there is a risk that the AGC hydraulic cylinder 001 may get stuck and fall during the pulling and pushing process. At the same time, the sliding plates 0011 on both sides of the AGC hydraulic cylinder 001 fit tightly with the mill stand 003. Due to the lack of circumferential positioning and positioning in the parallel and perpendicular directions to the sliding plates, the position of the old AGC hydraulic cylinder 001 cannot be determined when it is pulled out. During the process of pushing the new AGC hydraulic cylinder 001 in with the upper support roller 002, it is impossible to accurately position the relative positions of the two new AGC hydraulic cylinders 001 and their relative positions with the bearing seat of the upper support roller 002. Therefore, the AGC hydraulic cylinder 001 on the drive side and the AGC hydraulic cylinder 001 on the operating side are prone to skew and cannot be smoothly positioned. When encountering the above problems, the only solution is to pull out the AGC hydraulic cylinder 001 along with the upper support roller 002, readjust its position visually, and then push it back in. This repeated pulling and pushing process results in high labor intensity and low work efficiency for employees. Furthermore, the on-site work position is high and the space is confined, making personnel positioning and construction inconvenient and posing safety hazards. Therefore, a new technical solution is urgently needed to solve these problems. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a quick replacement device for AGC hydraulic cylinders in heavy plate rolling mills, thereby preventing the AGC hydraulic cylinders from tilting during installation, reducing the difficulty of replacing AGC hydraulic cylinders, and improving equipment maintenance efficiency.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A quick-change device for AGC hydraulic cylinders in a heavy plate rolling mill includes a rectangular horizontal base plate, which is disposed between the upper support roll of the heavy plate rolling mill and the AGC hydraulic cylinder. The bottom of the base plate is provided with a base plate positioning mechanism corresponding to the pressure plate of the upper support roll at the top of each bearing seat of the upper support roll, and the top of the base plate is provided with a hydraulic cylinder positioning mechanism matching each AGC hydraulic cylinder.

[0007] The aforementioned fast-change device for AGC hydraulic cylinders in a heavy plate rolling mill includes a positioning mechanism for each hydraulic cylinder, comprising a positioning cone pin and an upper positioning bolt. Multiple positioning cone pins are evenly distributed around the cylindrical surface of the AGC hydraulic cylinder. The lower end of each positioning cone pin is fixedly connected to a base plate. An upper positioning block is provided on the top of the base plate, corresponding to the sliding plates on both sides of the AGC hydraulic cylinder. The upper positioning block is provided with an upper positioning block threaded hole that matches the upper positioning bolt. The upper positioning bolt is screwed into the upper positioning block threaded hole and rests against the sliding plate.

[0008] The aforementioned fast replacement device for the hydraulic cylinder of the AGC of the wide and thick plate rolling mill includes a positioning cone pin comprising a lower cylinder and an upper cylinder that are coaxial with each other. The lower cylinder is fixed in a pin hole on the base plate. The diameter of the upper cylinder is larger than that of the lower cylinder. The lower end of the upper cylinder is fixedly connected to the upper end of the lower cylinder. The upper surface of the upper cylinder is a conical surface.

[0009] The aforementioned fast replacement device for AGC hydraulic cylinders in a heavy plate rolling mill has a baffle on the top of the upper positioning block, and a jack is provided between the baffle and the sliding plate of the AGC hydraulic cylinder.

[0010] The aforementioned quick-change device for the AGC hydraulic cylinder of the heavy plate rolling mill has a scale indicator line on the upper positioning bolt.

[0011] The aforementioned fast replacement device for the AGC hydraulic cylinder of the heavy plate rolling mill includes a base plate positioning mechanism comprising a lower positioning bolt and positioning bosses on both sides of the bottom of the base plate. The positioning bosses on both sides of the base plate are respectively attached to both sides of the upper support roller equalizing plate. A lower positioning block is provided at the bottom of the base plate, corresponding to both ends of the upper support roller equalizing plate. The lower positioning block is provided with a lower positioning block threaded hole that matches the lower positioning bolt. The lower positioning bolt is screwed into the lower positioning block threaded hole and presses against the end of the upper support roller equalizing plate.

[0012] The aforementioned quick-change device for AGC hydraulic cylinders in a heavy plate rolling mill has a guide angle on the inner side of the positioning boss.

[0013] The aforementioned fast replacement device for the hydraulic cylinder of the AGC of the heavy plate rolling mill has safety railings at the top of both ends of the base plate, and vertical railing sleeves at the top of both ends of the base plate, with the lower part of the safety railing inserted into the railing sleeves.

[0014] The aforementioned fast replacement device for the hydraulic cylinder of the AGC in a heavy plate rolling mill has inspection holes on its base plate corresponding to each lower positioning bolt.

[0015] The aforementioned fast-change device for AGC hydraulic cylinders in a heavy plate rolling mill has reinforcing ribs on both sides of the base plate.

[0016] This invention achieves rapid positioning between the base plate and the AGC hydraulic cylinder through a hydraulic cylinder positioning mechanism, and rapid positioning between the base plate and the upper support roller through a base plate positioning mechanism. It has the advantages of simple structure, convenient operation, safety, and high positioning accuracy. Using this device can prevent the AGC hydraulic cylinder from deviating during installation, reduce the difficulty of replacing the AGC hydraulic cylinder, and improve equipment maintenance efficiency. Attached Figure Description

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0018] Figure 1This is a three-dimensional structural diagram of the top of this utility model; Figure 2 This is a three-dimensional structural schematic diagram of the present invention from another perspective (bottom). Figure 3 This is a schematic diagram of the (top) structure of the AGC replacement platform; Figure 4 This is a structural diagram of the AGC platform from another perspective (bottom). Figure 5 This is a schematic diagram of the positioning tapered pin; Figure 6 This is a structural diagram of the upper positioning bolt; Figure 7 This is a schematic diagram of the assembly of this utility model with the AGC hydraulic cylinder and the upper support roller; Figure 8 yes Figure 7 Top view; Figure 9 yes Figure 7 Main view; Figure 10 This is a schematic diagram illustrating the positioning of the AGC hydraulic cylinder using this invention; Figure 11 yes Figure 10 A three-dimensional structural diagram; Figure 12 This is a schematic diagram of disassembling the AGC hydraulic cylinder using this utility model; Figure 13 This is a structural schematic diagram of the AGC hydraulic cylinder; Figure 14 This is a schematic diagram showing the installation position of the AGC hydraulic cylinder inside the rolling mill; Figure 15 This is a schematic diagram of replacing the AGC hydraulic cylinder using traditional methods.

[0019] The labels in the diagram are as follows: 001, AGC hydraulic cylinder; 0011, slide plate; 002, upper support roll; 0021, upper support roll equalizing plate; 003, mill stand; 0031, AGC intermediate platform; 004, lower support roll; 005, roll changing bracket.

[0020] 1. AGC replacement platform; 2. Positioning cone pin; 3. Upper positioning bolt, 301, scale indicator line; 4. Lower positioning bolt; 5. Safety railing 101. Base plate; 102. Positioning boss; 1021. Guide angle; 103. Pin hole; 104. Upper positioning block; 1041. Upper positioning block threaded hole; 1042. Baffle; 105. Lower positioning block; 1051. Lower positioning block threaded hole; 106. Inspection hole; 107. Reinforcing rib; 108. Guardrail sleeve.

[0021] 201. Lower cylinder; 202. Upper cylinder; 2021. Conical surface; 2022. Cylindrical surface. Detailed Implementation

[0022] This utility model addresses the problems existing in the prior art by providing a quick replacement device for AGC hydraulic cylinders in a heavy plate rolling mill. This device uses the guiding effect of the conical surface of the positioning pin and the constraint effect of the cylindrical surface to quickly position two AGC hydraulic cylinders. Simultaneously, it uses upper and lower positioning bolts to adjust the positioning, achieving precise positioning and constraint of each degree of freedom of the AGC hydraulic cylinders in the horizontal direction. It has advantages such as simple structure, high positioning accuracy, and convenient operation, enabling rapid replacement of AGC hydraulic cylinders and improving equipment maintenance efficiency.

[0023] See Figure 1 and Figure 2 This utility model mainly includes an AGC replacement platform 1, a positioning cone pin 2, an upper positioning bolt 3, a lower positioning bolt 4, and a safety railing 5.

[0024] See Figure 3 and Figure 4 The AGC replacement platform 1 includes a base plate 101, a positioning boss 102, a pin hole 103, an upper positioning block 104, a lower positioning block 105, an inspection hole 106, a reinforcing rib 107, and a railing sleeve 108.

[0025] The base plate 101 is a rectangular steel plate with a certain thickness, located below the AGC hydraulic cylinder 001. Its length is greater than the distance between the two AGC hydraulic cylinders 001 of the rolling mill and leaves a certain space for maintenance operations. Its width is consistent with the width of the bearing seat of the upper support roll 002. Its thickness can be controlled within a certain range to give the base plate 101 a certain strength, while ensuring that the AGC hydraulic cylinder 001 above it and the internal components of the rolling mill frame 003 have a certain gap in the vertical direction.

[0026] The substrate 101 is horizontally mounted on the upper support roller equalizing plate 0021 (the upper support roller equalizing plate 0021 is mounted above the bearing seat of the upper support roller 002). Positioning bosses 102 are provided on both sides of the substrate 101 at positions corresponding to each upper support roller 002. Guide angles 1021 are provided on the inner sides of the positioning bosses 102. The outer spacing of the two positioning bosses 102 along the width direction of the substrate 101 is consistent with the width of the substrate 101; the inner spacing of the two positioning bosses 102 along the width direction of the substrate 101 is consistent with the width of the upper support roller equalizing plate 0021; the length of the positioning bosses 102 is consistent with the length of the upper support roller equalizing plate 0021; and the thickness of the positioning bosses 102 is consistent with the distance between the upper surface of the upper support roller equalizing plate 0021 and the upper surfaces of both ends of the bearing seat of the upper support roller 002. The center distance between the two positioning bosses 102 along the length direction of the substrate 101 is consistent with the center distance between the bearing seats of the two upper support rollers 002.

[0027] The base plate 101 has two sets of circumferentially distributed pin holes 103, which correspond to two AGC hydraulic cylinders 001 respectively. The centers of each set of pin holes 103 are evenly distributed on a concentric circle. The center distance between the two concentric circles is consistent with the center distance between the two AGC hydraulic cylinders 001.

[0028] Both sides of the substrate 101 are provided with upper positioning blocks 104 corresponding to the sliding plates 0011 on both sides of each AGC hydraulic cylinder 001. The upper positioning blocks 104 are provided with baffles 1042 and through upper positioning block threaded holes 1041. The upper positioning block threaded holes 1041 are matched with upper positioning bolts 3. The baffles 1042 are rectangular plates and are located above the upper positioning blocks 104. The bottom of the substrate 101 is provided with lower positioning blocks 105 corresponding to the two ends of each upper support roller equalizing plate 0021. The lower positioning blocks 105 are provided with through lower positioning block threaded holes 1051. The lower positioning block threaded holes 1051 are matched with lower positioning bolts 4. The lower positioning bolts 4 are screwed into the lower positioning block threaded holes 1051 and press against the end of the upper support roller equalizing plate 0021 to position the substrate 101.

[0029] The base plate 101 is provided with inspection holes 106 corresponding to each lower positioning bolt 4. A reinforcing rib 107 is provided between the two upper positioning blocks 104 on the same side of the base plate 101. Vertically installed railing sleeves 108 are provided at both ends of the upper part of the base plate 101 for inserting safety railings 5. The railing sleeves 108 are made of thin-walled round tubes.

[0030] See Figure 5 The positioning cone pin 2 consists of two cylinders with different diameters and coaxiality. The diameter of the lower cylinder 201 matches the pin hole 103 of the base plate 101, and the diameter of the upper cylinder 202 is larger than that of the lower cylinder 201. The lower end surface of the upper cylinder 202 is a cylindrical surface 2022, and the upper end surface is a conical surface 2021. The positioning cone pin 2 is installed in the pin hole 103 of the base plate 101, and the diameter of the inscribed circle formed by the cylindrical surfaces 2022 of the multiple positioning cone pins 2 is consistent with the outer diameter of the cylinder body of the AGC hydraulic cylinder 001.

[0031] See Figure 7 The AGC hydraulic cylinder 001 can be guided by the conical surface 2021 of the positioning pin 2 and constrained by the cylindrical surface 2022. In the circumferential direction, the positioning pin 2 leaves a certain gap with the body of the AGC hydraulic cylinder 001 and its accessories.

[0032] See Figure 1 , Figure 2 , Figure 6The upper positioning bolt 3 is threadedly connected to the threaded hole 1041 of the upper positioning block 104, and the lower positioning bolt 4 is threadedly connected to the threaded hole 1051 of the lower positioning block 105. Both the upper positioning bolt 3 and the lower positioning bolt 4 have a scale indicator 301 at their front ends to indicate the bolt engagement length. Operators can tighten the lower positioning bolt 4 through the inspection hole 106 on the base plate 101.

[0033] See Figure 1 The safety railing 5 is inserted into the railing sleeve 108 at the end of the base plate 101 via its lower insert rod, thus providing safety protection.

[0034] See Figures 7-9 The substrate 101 is mounted on the upper support roller equalizing plate 0021. Its width direction is constrained and positioned by the positioning bosses 102 on both sides of the upper support roller equalizing plate 0021. As the AGC replacement platform 1 rises or the old AGC hydraulic cylinder 001 falls, the substrate 101 is guided by the conical surface 2021 of the positioning pin 2 and constrained by the cylindrical surface 2022, so that the substrate 101 adaptively adjusts its position in the length direction. Then, the lower positioning bolt 4 is pressed against the end of the upper support roller equalizing plate 0021 to achieve the constrained positioning of the substrate 101 in the length direction.

[0035] The center positions of the two AGC hydraulic cylinders 001 can be positioned by multiple positioning cone pins 2. The position of the slide plate 0011 of the old AGC hydraulic cylinder 001 can be determined by pressing the upper positioning bolt 3 against the side of the slide plate 0011 on both sides of the AGC hydraulic cylinder 001. Then, the upper positioning bolt 3 drives the new AGC hydraulic cylinder 001 to rotate, thereby adjusting the circumferential position of the new AGC hydraulic cylinder 001 so that the center position and circumferential position of the new AGC hydraulic cylinder 001 are consistent with those of the old AGC hydraulic cylinder 001.

[0036] The upper positioning block 104 maintains a certain distance from the AGC hydraulic cylinder 001. If the upper positioning bolt 3 cannot adjust the circumferential position of the AGC hydraulic cylinder 001 through the threaded connection, a hydraulic jack can be placed between the upper positioning block 104 and the AGC hydraulic cylinder 001 or between the baffle 1042 of the upper positioning block 104 and the AGC hydraulic cylinder 001. The circumferential position of the AGC hydraulic cylinder 001 can be adjusted with the help of the hydraulic jack.

[0037] See Figures 7-12 The specific operating steps for replacing the hydraulic cylinder of the rolling mill AGC using this utility model are as follows: (1) Adjust the old AGC hydraulic cylinder 001 to the maintenance position by operation, pull out the upper support roller 002 and place this device on the upper support roller equalizing plate 0021 (visually check that the outer end face of the positioning boss 102 of the base plate 101 is basically flush with the outer end face of the upper support roller equalizing plate 0021), lift it away from the AGC intermediate platform 0031, and push it into the mill frame 003 along with the upper support roller 002.

[0038] (2) Slowly lift the bearing seat of the upper support roller 002 and the upper support roller equalizing plate 0021 so that the positioning cone pin 2 on the base plate 101 contacts the bottom of the AGC hydraulic cylinder. As the upper support roller equalizing plate 0021 rises continuously, the AGC replacement platform 1 is positioned by the guidance of the conical surface 2021 of the positioning cone pin 2 and the constraint of the cylindrical surface 2022. At the same time, the AGC replacement platform 1 is positioned by the constraint of the positioning boss 102 of the base plate 101 and the two sides of the upper support roller equalizing plate 0021 along the width direction, so that the base plate 101 adaptively adjusts the position in the length direction.

[0039] (3) Adjust the positions of the upper positioning bolt 3 and the lower positioning bolt 4 so that the upper positioning bolt 3 contacts the slide plates 0011 on both sides of the old AGC hydraulic cylinder 001. The upper positioning bolt 3 records the position of the slide plates 0011, thereby determining the circumferential position of the old AGC hydraulic cylinder 001. The lower positioning bolt 4 contacts the upper support roller equalizing plate 0021 to position the base plate 101 in the length direction.

[0040] (4) After disassembling the relevant connections of the old AGC hydraulic cylinder 001, slowly lower the bearing seat of the upper support roller 002 and the pressure equalizing plate of the upper support roller 0021, so that the AGC hydraulic cylinder 001 descends with the pressure equalizing plate of the upper support roller 0021 to the roller changing bracket 005 above the lower support roller 004.

[0041] (5) The AGC hydraulic cylinder 001 is pulled out as the upper support roller pressure plate 0021 descends.

[0042] (6) Lift the old AGC hydraulic cylinder 001 away, reinstall the new AGC hydraulic cylinder 001 and use the positioning cone pin 2 and the upper positioning bolt 3 for positioning constraint.

[0043] (7) The new AGC hydraulic cylinder 001 is pushed into the window along with the bearing seat of the upper support roller 002 and the pressure plate 0021 of the upper support roller (during which the circumferential position of the AGC hydraulic cylinder 001 can be adjusted by using the upper positioning bolt 3 or hydraulic jack).

[0044] (8) Slowly raise the bearing seat of the upper support roller 002 and the pressure plate 0021 of the upper support roller, so that the new AGC hydraulic cylinder 001 rises with the pressure plate 0021 of the upper support roller to the installation position. After making the relevant connections, lower the bearing seat of the upper support roller 002 to the roller changing bracket 005, reinstall the upper support roller 002 and lift it away from this device, and reinstall the AGC intermediate platform 0031.

[0045] (9) Push the upper and lower support rollers into place and perform routine operations such as subsequent roller reinstallation to complete the quick replacement of AGC hydraulic cylinder 001.

[0046] The beneficial effects of adopting the above technical solution are as follows: the device can accurately position and quickly adjust the AGC hydraulic cylinder, while providing a safe and convenient maintenance platform, which is convenient for maintenance personnel to operate. It has the advantages of simple structure, high positioning accuracy and convenient operation, and can effectively solve the problem of replacing AGC hydraulic cylinders in heavy plate rolling mills.

Claims

1. A quick-change device for AGC hydraulic cylinders in a heavy plate rolling mill, characterized in that, The system includes a rectangular horizontal base plate (101), which is disposed between the upper support roll (002) and the AGC hydraulic cylinder (001) of the heavy plate rolling mill. The bottom of the base plate (101) is provided with a base plate positioning mechanism corresponding to the upper support roll equalizing plate (0021) at the top of each bearing seat of the upper support roll (002), and the top of the base plate (101) is provided with a hydraulic cylinder positioning mechanism that matches each AGC hydraulic cylinder (001).

2. The quick-change device for AGC hydraulic cylinders in a heavy plate rolling mill according to claim 1, characterized in that, Each hydraulic cylinder positioning mechanism includes a positioning cone pin (2) and an upper positioning bolt (3). Multiple positioning cone pins (2) are evenly distributed around the cylindrical surface of the AGC hydraulic cylinder (001). The lower end of each positioning cone pin (2) is fixedly connected to the base plate (101). An upper positioning block (104) corresponding to the sliding plates (0011) on both sides of the AGC hydraulic cylinder (001) is provided on the top of the base plate (101). The upper positioning block (104) is provided with an upper positioning block threaded hole (1041) that matches the upper positioning bolt (3). The upper positioning bolt (3) is screwed into the upper positioning block threaded hole (1041) and presses against the sliding plate (0011).

3. The quick-change device for AGC hydraulic cylinders in a heavy plate rolling mill according to claim 2, characterized in that, The positioning cone pin (2) includes a lower cylinder (201) and an upper cylinder (202) that are coaxial with each other. The lower cylinder (201) is fixed in a pin hole (103) on the base plate (101). The diameter of the upper cylinder (202) is larger than the diameter of the lower cylinder (201). The lower end of the upper cylinder (202) is fixedly connected to the upper end of the lower cylinder (201). The upper surface of the upper cylinder (202) is a conical surface (2021).

4. The quick-change device for AGC hydraulic cylinders in a heavy plate rolling mill according to claim 3, characterized in that, The top of the upper positioning block (104) is provided with a baffle (1042), and a jack is provided between the baffle (1042) and the slide plate (0011) of the AGC hydraulic cylinder (001).

5. The quick-change device for AGC hydraulic cylinders in a heavy plate rolling mill according to claim 4, characterized in that, The upper positioning bolt (3) is provided with a scale indicator line (301).

6. A quick-change device for AGC hydraulic cylinders in a heavy plate rolling mill according to any one of claims 1-5, characterized in that, The substrate positioning mechanism includes a lower positioning bolt (4), and positioning bosses (102) are provided on both sides of the bottom of the substrate (101). The positioning bosses (102) on both sides of the substrate (101) are respectively attached to the two sides of the upper support roller equalizing plate (0021). A lower positioning block (105) is provided at the bottom of the substrate (101) corresponding to the two ends of the upper support roller equalizing plate (0021). The lower positioning block (105) is provided with a lower positioning block threaded hole (1051) that matches the lower positioning bolt (4). The lower positioning bolt (4) is screwed into the lower positioning block threaded hole (1051) and presses against the end of the upper support roller equalizing plate (0021).

7. A quick-change device for AGC hydraulic cylinders in a heavy plate rolling mill according to claim 6, characterized in that, The inner side of the positioning boss (102) is provided with a guide angle (1021).

8. A quick-change device for AGC hydraulic cylinders in a heavy plate rolling mill according to claim 7, characterized in that, Safety railings (5) are provided at the top of both ends of the substrate (101), and vertical railing sleeves (108) are provided at the top of both ends of the substrate (101). The lower part of the safety railing (5) is inserted into the railing sleeve (108).

9. A quick-change device for AGC hydraulic cylinders in a heavy plate rolling mill according to claim 8, characterized in that, The substrate (101) has inspection holes (106) corresponding to each lower positioning bolt (4).

10. A quick-change device for AGC hydraulic cylinders in a heavy plate rolling mill according to claim 9, characterized in that, The substrate (101) is provided with reinforcing ribs (107) on both sides.

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