Vertical rolling mill AWC cylinder replacing device

Abstract

The utility model discloses an AWC cylinder replacing device of a vertical rolling mill. The AWC cylinder replacing device comprises a push-out mechanism capable of pushing an AWC cylinder out of a mounting hole and a suspension mechanism capable of hoisting and transferring the AWC cylinder. The push-out mechanism comprises a push-out trolley capable of being placed in the rolling mill rack and walking, a push-out rod capable of penetrating through a mounting hole and pull rings distributed and mounted on the rolling mill rack, the push-out trolley is provided with a lifting point, a mounting position of the push-out rod and a chain block, and the chain block of the push-out trolley is used for driving the push-out trolley and the push-out rod to push out the AWC cylinder after being correspondingly connected with the pull rings; the front portion of the suspension rail is overhung, the rear portion of the suspension rail is arranged on a rolling mill rack, the suspension trolleys are distributed on the suspension rail in a front-back mode and can walk, the supporting beam is used for supporting and being connected with the rear end of an AWC cylinder body, chain blocks are arranged on the suspension trolleys, and the chain blocks of the suspension trolleys in the front and the rear are used for lifting the front end of the AWC cylinder body and the supporting beam respectively. According to the device, the AWC cylinder can be quickly and conveniently disassembled and assembled, and the occupied space is small.

Description

TECHNICAL FIELD

[0001] The utility model belongs to metallurgy rolling field, concretely relates to a kind of AWC cylinder replacement device of vertical roll mill. BACKGROUND

[0002] Vertical roll mill is widely used in the production of hot-rolled strip, and the roll gap control precision has a crucial influence on the yield, edge and surface quality of the strip. The roll gap of the vertical roll mill is adjusted by two AWC cylinders (Automatic Width Control Cylinder) above and below. The working condition of the AWC cylinder must be kept in good condition to ensure the precision of the roll gap. However, in the long-term use and under the harsh environment, the wear of the internal parts or the aging of the sealing parts of the AWC cylinder can cause the failure of the AWC cylinder, which cannot meet the precision requirement of the roll gap control. Therefore, it needs to be replaced in time.

[0003] Currently, there are the following difficulties in the loading and unloading of the AWC cylinder replacement of the vertical roll mill: 1) the space around the roll mill is limited, and large and complex loading and unloading devices cannot be used; 2) the AWC cylinder is horizontally installed in the mounting hole of the vertical roll mill rack, and it needs to be pushed out of the mounting hole first. The conventional hoisting and dismounting cannot meet the requirement and cannot provide enough pushing force; 3) the AWC cylinder is large in size and heavy in weight, and the dismounting cannot be completed by manpower alone. UTILITY MODEL CONTENTS

[0004] The utility model aims to provide an AWC cylinder replacement device of vertical roll mill, which can quickly and conveniently complete the dismounting and installation of the AWC cylinder and occupies small space.

[0005] The technical solution adopted by the utility model is as follows:

[0006] An AWC cylinder replacement device of vertical roll mill includes a pushing-out mechanism capable of pushing the AWC cylinder out of the mounting hole and a suspension mechanism capable of hoisting and transferring the AWC cylinder. The pushing-out mechanism includes a pushing-out trolley capable of being put into the roll mill rack and walking, a pushing-out rod capable of passing through the mounting hole, and pull rings distributed and installed on the roll mill rack. The pushing-out trolley is provided with a lifting point, a mounting position of the pushing-out rod and a hand-operated hoist. The front and rear ends of the pushing-out rod are used for being connected with the piston rod end of the AWC cylinder and the mounting position respectively. The hand-operated hoist of the pushing-out trolley is used for being connected with each pull ring after being connected to drive the pushing-out trolley and the pushing-out rod to push out the AWC cylinder. The suspension mechanism includes a suspension rail provided with a front overhang and a rear part on the roll mill rack, suspension trolleys distributed and provided on the suspension rail and capable of walking, and a supporting beam used for supporting and connecting the rear end of the cylinder body of the AWC cylinder. The suspension trolleys are provided with hand-operated hoists, and the hand-operated hoists of the front and rear suspension trolleys are used for hoisting the front end of the cylinder body of the AWC cylinder and the supporting beam respectively. The supporting beam is provided with a lifting point and a connecting point of the rear end of the cylinder body of the AWC cylinder.

[0007] Preferably, the push-out trolley is provided with a pull rope, and the push-out rod is provided with a balance ring, the pull rope is used to pull the balance ring to keep the push-out rod horizontal after the push-out rod is installed.

[0008] Preferably, one end of the pull rope is arranged on the ratchet assembly, and the other end of the pull rope is arranged downwards after passing through the fixed pulley, the pull rope can be freely wound upwards and limited downwards when the ratchet assembly is locked, and the pull rope can be freely wound upwards and downwards when the ratchet assembly is unlocked.

[0009] Preferably, the main body of the push-out trolley is a vertical frame, walking wheels for cooperating with guide rails on the rolling mill rack are arranged on both sides of the upper end of the frame, the lifting points of the push-out trolley are arranged on both sides of the upper end of the frame, the mounting positions are arranged on the upper and lower parts of the middle part of the frame and correspond to the positions of the mounting holes respectively, the pull rope is arranged on the middle part of the upper end of the frame, and the hand-operated hoists of the push-out trolley are arranged on both sides of the upper and lower ends of the frame.

[0010] Preferably, the main body of the push-out rod is a long rod with a cross-shaped section, a long groove is formed around the long rod, a sleeve with a screw hole is arranged at the front end of the long rod, and a connecting block with a bolt hole is arranged at the rear end of the long rod, the screw hole and the bolt hole are located in the long groove region, the sleeve can be matched with the end part of the piston rod of the AWC cylinder and connected through a screw, and the connecting block can be connected with the mounting position through a bolt.

[0011] Preferably, the suspension rail has an I-shaped section along a line, the top plate of the suspension rail is arranged on the rolling mill rack along a line at the rear part, the suspension trolley surrounds the bottom plate of the suspension rail in a C shape, the walking wheels of the suspension trolley are supported on the bottom plate of the suspension rail and located on both sides of the web of the suspension rail, and the anti-falling plates are arranged at both ends of the suspension rail and used for preventing the suspension trolley from falling out.

[0012] Preferably, a pair of wedge blocks for centering the cylinder body of the AWC cylinder are arranged on the upper side of the joist.

[0013] Preferably, the main body of the joist is a tubular beam body, the lifting point positions of the joist are arranged on both ends of the upper side of the beam body, and the connecting points are arranged on the middle part of the joist and are through holes.

[0014] Preferably, bosses with screw holes are arranged at the lifting point positions of the joist to increase the installation depth of the lifting points of the joist.

[0015] The beneficial effects of the utility model are as follows:

[0016] The device can quickly and conveniently complete dismounting and mounting of the AWC cylinder, and occupies small space: the force required for pushing the AWC cylinder out of the mounting hole is much greater than the force required for pushing the AWC cylinder into the mounting hole, in order to realize pushing the AWC cylinder out of the mounting hole in limited space, a hand chain hoist and a pull ring of the pushing trolley are utilized, since the pull ring is fixed, pushing the hand chain hoist of the pushing trolley can drive the pushing trolley and the pushing rod to push the AWC cylinder forward, the mounting of the pushing trolley, the pushing rod and the pull ring utilizes the space of the rolling mill stand itself, and no space is additionally occupied on the transmission side of the rolling mill stand; the suspension trolley can lift the suspended part of the AWC cylinder body and move in the process of pushing and pulling the AWC cylinder into and out of the mounting hole, so that the AWC cylinder is guaranteed to be horizontal, and on the other hand, the suspension trolley can lift the front and rear ends of the AWC cylinder body to realize overall transfer, and the suspension trolley is arranged on the operation side, so that no space of the rolling mill stand is occupied. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a sectional view of the AWC cylinder replacement device of the stand roll rolling mill in the utility model when pushing the upper AWC cylinder.

[0018] Figure 2 is Figure 1 is a side view of the suspension trolley lifting the AWC cylinder on the suspension rail.

[0019] Figure 3 is a perspective view of the pushing trolley in the utility model.

[0020] Figure 4 is a front view of the pushing trolley in the utility model.

[0021] Figure 5 is a side view of the pushing trolley in the utility model.

[0022] Figure 6 is a perspective view of the pushing rod in the utility model.

[0023] Figure 7 is a front view of the pushing rod in the utility model.

[0024] Figure 8 is a perspective view of the joist in the utility model.

[0025] Figure 9 is a side view of the joist in the utility model.

[0026] In the figure: 1 - push-out trolley; 1.1 - hand chain block; 1.2 - ratchet assembly; 1.3 - fixed pulley; 1.4 - walking wheel; 1.5 - frame; 1.6 - mounting position; 1.7 - lifting point; 2 - pull ring; 3 - suspension trolley; 4 - hand chain block; 5 - suspension rail; 6 - push-out rod; 6.1 - screw; 6.2 - long rod; 6.3 - balance ring; 6.4 - bolt; 7 - joist; 7.1 - beam body; 7.2 - wedge block; 7.3 - boss; 8 - connecting point; 9 - lifting point; A - upper AWC cylinder; B - lower AWC cylinder. DETAILED DESCRIPTION

[0027] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the following will be combined with the accompanying drawings for the embodiments of the present application to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the accompanying drawings can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0029] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0030] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the application is usually placed, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the indicated device or element 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.

[0031] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components must be absolutely horizontal or overhanging, but can be slightly inclined.

[0032] In the description of the application, it is necessary to explain that, unless otherwise explicitly specified and limited, the terms "set", "install", "connect", "connect" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0033] In this application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0034] The features and performance of the application are further described in detail below in conjunction with the embodiments.

[0035] The embodiment discloses a vertical roll mill AWC cylinder replacement device, which comprises a pushing mechanism and a suspension mechanism; wherein:

[0036] The pushing mechanism can push the AWC cylinder out of the installation hole, which comprises a pushing trolley 1, a pushing rod 6 and a pull ring 2. The pushing trolley 1 can be put into the mill stand and walk, and the pushing trolley 1 is provided with a lifting point 1.7, an installation position 1.6 of the pushing rod 6 and a hand-operated hoist 1.1. The pushing rod 6 can pass through the installation hole, and the front and rear ends of the pushing rod 6 are used for horizontal connection with the piston rod end of the AWC cylinder and the installation position 1.6 respectively. The pull ring 2 is distributed and installed on the mill stand, and the hand-operated hoist 1.1 of the pushing trolley 1 is used for corresponding connection with each pull ring 2 to drive the pushing trolley 1 and the pushing rod 6 to push out the AWC cylinder, as shown in Figure 1 、 Figures 3 to 5 ;

[0037] The suspension mechanism can lift and transfer the AWC cylinder, which comprises a suspension rail 5, a suspension trolley 3 and a joist 7. The front part of the suspension rail 5 is cantilevered, and the rear part is arranged on the mill stand. The suspension trolley 3 is arranged on the suspension rail 5 and can walk. The suspension trolley 3 is provided with a hand-operated hoist 4. The joist 7 is used to support and connect the rear end of the AWC cylinder body. The joist 7 is provided with a lifting point 9 and a connecting point 8 of the rear end of the AWC cylinder body. The hand-operated hoists 4 of the front and rear suspension trolleys 3 are used to lift the front end of the AWC cylinder body and the joist 7 respectively, as shown in Figure 1 、 Figure 2 、 Figure 8 and Figure 9 .

[0038] Regarding the pushing-out mechanism, in the present embodiment, preferably:

[0039] As shown in Figure 1 , Figures 3 to 5 , the main body of the pushing-out trolley 1 is a vertical frame 1.5, walking wheels 1.4 for cooperating with guide rails on the rolling mill stand are arranged on both sides of the upper end of the frame 1.5, lifting points 1.7 of the pushing-out trolley 1 are arranged on both sides of the upper end of the frame 1.5, mounting positions 1.6 are arranged on the upper and lower parts of the middle part of the frame 1.5 and correspond to the positions of the mounting holes respectively, a pulling rope is arranged on the middle part of the upper end of the frame 1.5, and hand-operated hoists 1.1 of the pushing-out trolley 1 are distributed on both sides of the upper and lower ends of the frame 1.5. This arrangement can provide a good force structure when the pushing-out trolley 1 is hoisted and the AWC cylinder is pushed out. When the pushing-out trolley 1 is hoisted, the pushing-out trolley 1 is in a vertical state under the action of its own weight. When the AWC cylinder is pushed out, the AWC cylinder is in the middle part, and the hand-operated hoists 1.1 of the pushing-out trolley 1 are distributed around the AWC cylinder, so that a stable pushing-out force can be applied. The lifting points 1.7 of the pushing-out trolley 1 can be lifting ring screws.

[0040] As shown in Figure 1 , Figures 3 to 5 , a pulling rope is arranged on the pushing-out trolley 1, and a balance ring 6.3 is arranged on the pushing-out rod 6. The pulling rope is used to pull the balance ring 6.3 to keep the pushing-out rod 6 horizontal after the pushing-out rod 6 is installed. Since the pushing-out rod 6 must be able to pass through the mounting hole, the size of the pushing-out rod 6 is relatively long, and when it is only installed at the rear end on the mounting position 1.6, there will be a large deviation in the levelness under the action of the disturbance. In order to facilitate the subsequent horizontal connection with the end part of the piston rod of the AWC cylinder, the pulling rope and the balance ring 6.3 are used to keep the pushing-out rod 6 horizontal. The lower end of the pulling rope can be provided with a pull hook, and the balance ring 6.3 can be a shackle.

[0041] As shown in Figure 1 , Figures 3 to 5 , one end of the pulling rope is arranged on the ratchet assembly 1.2, and the other end is wound around the fixed pulley 1.3 and then downward. When the ratchet assembly 1.2 is locked, the pulling rope can be freely wound upward and limited downward. When the ratchet assembly 1.2 is unlocked, the pulling rope can be freely wound upward and downward. When the ratchet assembly 1.2 is unlocked, the length of the pulling rope can be freely adjusted according to the installation position of the pushing-out rod 6. When the rear end of the pushing-out rod 6 is installed on the mounting position 1.6, the pulling rope is pulled to pull the balance ring 6.3, and the ratchet assembly 1.2 is locked. In this way, reliable pulling force can be applied to the pushing-out rod 6.

[0042] As shown in Figure 1 , Figures 3 to 5 , the mounting position 1.6 is a thickened channel steel, and bolt holes are arranged on the channel steel.

[0043] As shown in Figure 1 , the pull ring 2 adopts a load screw, which is fastened and installed on the rolling mill stand during use and can be removed during non-use.

[0044] As shown in Figure 6 , Figure 7 , the main body of the push rod 6 is a long rod 6.2 with a cross-section, the long rod 6.2 is formed with a long groove along the circumference, the front end is provided with a sleeve with a screw hole, and the rear end is provided with a connecting block with a bolt hole. The screw hole and the bolt hole are in the long groove area, the sleeve can be matched with the end of the AWC cylinder piston rod and connected through the screw 6.1, and the connecting block can be connected with the installation position 1.6 through the bolt 6.4. The setting of the long groove on the long rod 6.2 facilitates the dismounting operation of the screw 6.1 and the bolt 6.4 when the two ends of the push rod 6 are connected, and the long rod 6.2 only transmits axial force and does not need to bear supporting force, so multiple long grooves can be set, and the self-weight can also be reduced.

[0045] Regarding the suspension mechanism, in the present embodiment, it is preferable that:

[0046] As shown in Figure 1 and Figure 2 , the suspension rail 5 has an I-shaped cross-section along the line, the top plate of the suspension rail 5 is installed on the rolling mill stand through a screw at the rear, the suspension trolley 3 surrounds the bottom plate of the suspension rail 5 in a C shape, the running wheels of the suspension trolley 3 are supported on the bottom plate of the suspension rail 5 and located on both sides of the web of the suspension rail 5, and the two ends of the suspension rail 5 are provided with anti-falling plates for preventing the suspension trolley from falling out. The suspension rail 5 can be removed when not in use.

[0047] As shown in Figure 1 and Figure 2 , the suspension rail 5 is located on both sides of the AWC cylinder and provided with two front and rear suspension trolleys 3 on each side.

[0048] As shown in Figure 8 and Figure 9 , the main body of the joist 7 is a tubular beam body 7.1, the lifting points 9 of the joist 7.1 are located at the two ends of the upper side of the beam body 7.1, and the connecting points 8 are located in the middle of the joist 7.1 and are through holes.

[0049] As shown in Figure 8 and Figure 9 , a boss 7.3 with a threaded hole is arranged at the position of the lifting point 9 of the joist 7 to increase the installation depth of the lifting point 9 of the joist 7. The lifting point 9 of the joist 7 can adopt a lifting ring screw.

[0050] As shown in Figure 8 and Figure 9 , a pair of wedge blocks 7.2 for centering the AWC cylinder body are arranged on the upper side of the joist 7. The wedge blocks 7.2 can directly center the AWC cylinder body, facilitating the subsequent connection of the joist 7 and the AWC cylinder body.

[0051] In the present embodiment: the AWC cylinder body is provided with an external tangent hole for installing the lifting point on both sides of the front and rear ends, the lower side of the rear end is provided with a threaded hole matched with the connecting point 8, and the end of the AWC cylinder piston rod is provided with a threaded hole for connecting with the push rod 6.

[0052] When the AWC cylinder needs to be replaced, the working method of the above-mentioned stand roll mill AWC cylinder replacement device is:

[0053] When the AWC cylinder is disassembled: first, use the workshop crane and the lifting point 1.7 of the push-out trolley 1 to lift the push-out trolley 1 into the mill stand, then use the workshop crane to lift the push-out rod 6 to the front of the push-out trolley 1, and connect the rear end of the push-out rod 6 with the installation position 1.6 on the push-out trolley 1, so that the push-out rod 6 is horizontally aligned with the AWC cylinder to be disassembled; then connect the hand-operated hoist 1.1 of the push-out trolley 1 with each pull ring 2 respectively, and then operate the hand-operated hoist 1.1 of the push-out trolley 1 to move the push-out rod 6 forward to the AWC cylinder, and connect the front end of the push-out rod 6 with the end of the piston rod of the AWC cylinder, and then connect the hand-operated hoist 4 of the front suspension trolley 3 with the front end of the AWC cylinder body and keep it in a lifted state; then operate the hand-operated hoist 1.1 of the push-out trolley 1 to drive the push-out trolley 1 and the push-out rod 6 to push the AWC cylinder out of the installation hole, and the suspension trolley 3 lifting the front end of the AWC cylinder body moves forward synchronously to ensure the horizontal sliding of the AGC cylinder; when the AWC cylinder is completely out of the installation hole, first connect the connection point 8 of the joist 7 with the rear end of the AWC cylinder body, and then connect the hand-operated hoist 4 of the rear suspension trolley 3 with the lifting point 9 of the joist 7 to make the joist 7 support the rear end of the AWC cylinder body, and then disconnect the front end of the push-out rod 6 from the end of the piston rod of the AWC cylinder; then use the front and rear suspension trolleys 3 to transfer the AWC cylinder outside the mill stand, and then connect the workshop crane with the AWC cylinder body and bear the weight, and then disconnect the joist 7 from the AWC cylinder body and the hand-operated hoist 4 of the suspension trolley 3 from the AWC cylinder body, and then use the workshop crane to lift away the AWC cylinder, which can be directly lifted to the repair workshop;

[0054] When the AWC cylinder is installed: first, use the workshop crane to lift the AWC cylinder under the overhanging part of the suspension rail 5, then connect the hand-operated hoist 4 of the front suspension trolley 3 with the front end of the AWC cylinder body, connect the hand-operated hoist 4 of the rear suspension trolley 3 with the lifting point 9 of the joist 7, and connect the connection point 8 of the joist 7 with the rear end of the AWC cylinder body to keep the AWC cylinder horizontal and aligned with the installation hole to be installed, and then use the front and rear suspension trolleys 3 to transfer the AWC cylinder to the vicinity of the installation hole inside the mill stand; then connect the end of the piston rod of the AWC cylinder with the front end of the push-out rod 6, and then disconnect the joist 7 from the AWC cylinder body, and then push the AWC cylinder horizontally into the installation hole and fasten it;

[0055] After replacement: remove the stand roll mill AWC cylinder replacement device.

[0056] The device can quickly and conveniently complete the dismounting and installation of the AWC cylinder, and occupies small space: the force required for the AWC cylinder to push out the installation hole is much greater than the force required for the AWC cylinder to push into the installation hole, in order to realize the AWC cylinder to push out the installation hole in the limited space, the hand chain block 1.1 of the pushing-out trolley 1 and the pull ring 2 are used, since the pull ring 2 is fixed, the hand chain block 1.1 of the pushing-out trolley 1 can drive the pushing-out trolley 1 and the pushing-out rod 6 to push out the AWC cylinder forward, the installation of the pushing-out trolley 1, the pushing-out rod 6 and the pull ring 2 utilizes the space of the rolling mill stand itself, and does not occupy the space of the transmission side of the rolling mill stand additionally; the suspension trolley 3 can lift the suspended part of the AWC cylinder body and move in the process of the AWC cylinder pushing out and pushing into the installation hole, and can ensure the AWC cylinder to be horizontal, and can also lift the front and rear ends of the AWC cylinder body to realize the overall transfer, and is arranged at the operation side, and does not occupy the space of the transmission side of the rolling mill stand.

[0057] The embodiments described above are part of the embodiments of the present application, rather than all the embodiments. The detailed description of the embodiments of the present application is not intended to limit the scope of the claimed application, but only represents selected 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 are within the scope of protection of the present application.

Claims

1. An AWC cylinder changing device for an edger mill, characterized in that: The push-out mechanism can push the AWC cylinder out of the installation hole, and the suspension mechanism can lift and transfer the AWC cylinder; the push-out mechanism comprises a push-out trolley capable of being put into the rolling mill stand and walking, a push-out rod capable of passing through the installation hole, and pull rings distributed and installed on the rolling mill stand; the push-out trolley is provided with a lifting point, a mounting position of the push-out rod, and a hand-operated hoist; the front and rear ends of the push-out rod are used for being connected with the piston rod end of the AWC cylinder and the mounting position respectively; the hand-operated hoist of the push-out trolley is used for being connected with the pull rings correspondingly, and then driving the push-out trolley and the push-out rod to push out the AWC cylinder; the suspension mechanism comprises a suspension rail provided with a front overhang and a rear part on the rolling mill stand, suspension trolleys distributed and provided on the suspension rail and capable of walking, and a supporting beam used for supporting and connecting the rear end of the cylinder body of the AWC cylinder; the suspension trolleys are provided with hand-operated hoists; the hand-operated hoists of the front and rear suspension trolleys are used for lifting the front end of the cylinder body of the AWC cylinder and the supporting beam respectively; the supporting beam is provided with a lifting point and a connecting point of the rear end of the cylinder body of the AWC cylinder.

2. The stand roll mill AWC cylinder replacement device according to claim 1, characterized by: The push-out trolley is provided with a lifting rope, and the push-out rod is provided with a balance ring; the lifting rope is used for lifting the balance ring to keep the push-out rod horizontal after the push-out rod is installed.

3. The stand roll mill AWC cylinder changing device according to claim 2, characterized in that: One end of the lifting rope is arranged on a ratchet assembly, and the other end of the lifting rope passes through a fixed pulley and then goes downward; when the ratchet assembly is locked, the lifting rope can be freely wound upward and is limited to go downward; when the ratchet assembly is unlocked, the lifting rope can be freely wound upward and downward.

4. The stand roll mill AWC cylinder changing device according to claim 2, characterized in that: The main body of the push-out trolley is a vertical frame; walking wheels for cooperating with guide rails on the rolling mill stand are arranged on both sides of the upper end of the frame; the lifting points of the push-out trolley are located on both sides of the upper end of the frame; the mounting positions are located on the upper and lower parts of the middle part of the frame and correspond to the positions of the installation holes respectively; the lifting rope is arranged on the middle part of the upper end of the frame; and the hand-operated hoists of the push-out trolley are distributed on both sides of the upper and lower ends of the frame.

5. The stand roll mill AWC cylinder changing device as recited in claim 1, characterized by: The main body of the push-out rod is a long rod with a cross-shaped cross section; a long groove is formed around the long rod along a line; a sleeve with a screw hole is arranged at the front end of the long rod; and a connecting block with a bolt hole is arranged at the rear end of the long rod; the screw hole and the bolt hole are located in the long groove region; the sleeve can be sleeved on the piston rod end of the AWC cylinder and connected through a screw; and the connecting block can be connected with the mounting position through a bolt.

6. The stand roll mill AWC cylinder changing device according to claim 1, characterized in that: The suspension rail has an I-shaped cross section along a line; the top plate of the suspension rail is arranged on the rolling mill stand along a line at the rear part; the suspension trolleys surround the bottom plate of the suspension rail in a C shape; the walking wheels of the suspension trolleys are supported on the bottom plate of the suspension rail and located on both sides of the web of the suspension rail; and the both ends of the suspension rail are provided with anti-extrusion plates for preventing the suspension trolleys from extruding out.

7. The stand roll mill AWC cylinder changing device as recited in claim 1, characterized by: The main body of the supporting beam is a tubular beam body; the lifting point positions of the supporting beam are arranged on both ends of the upper side of the beam body; and the connecting point is arranged on the middle part of the supporting beam and is a through hole.

8. The stand roll mill AWC cylinder replacement device according to claim 1 or 7, characterized by: A pair of wedge blocks for centering the cylinder body of the AWC cylinder are arranged on the upper side of the supporting beam.

9. The stand roll mill AWC cylinder changing device according to claim 7, characterized in that: A boss with a threaded hole is arranged at the lifting point position of the supporting beam to increase the installation depth of the lifting point of the supporting beam.

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