A hoisting method that can achieve safe and fast roll preparation on a roll changing cart

Abstract

The present invention discloses a hoisting method that can achieve safe and fast roll preparation on a roll changing cart. The distance between the two guide rails of the intermediate roll is 765 mm, the distance of the intermediate roll without installed guide rails and limit blocks is 835 mm, and the length is 1340 mm. The optimization method design is carried out according to the characteristics of the roll changing cart structure; the advantages of the present invention: improving the original working roll hoisting method, redesigning and improving the design deficiencies affecting hoisting, aiming to achieve safe and fast roll hoisting. The operating workers do not need to climb up and down on the roll changing cart, eliminating the existing safety hazards and realizing qualitative safety.

Description

Technical Field

[0001] The present invention relates to the field of machinery, and specifically to a hoisting method capable of safely and quickly preparing rolls on a roll-changing vehicle. Background Art

[0002] The five-stand six-high cold rolling mill of the third cold rolling mill of Benxi Steel was designed by SMS SIEMAG of Germany. The maximum rolling force is 3300T, the maximum rolling speed is 1500m / min, the annual designed output is 2.3 million tons, and the average monthly output is 180,000 - 200,000 tons. The average number of work roll changes per month is 400 - 500 times, that is, the work rolls need to be hoisted on the roll-changing vehicle 800 - 1000 times per month on average.

[0003] In order to increase the output of the rolling mill, this unit is equipped with a fast roll-changing vehicle, which can realize on-line roll change. On-line roll change means that the strip is still in the stand, and the roll-changing vehicle extracts the used intermediate roll and work roll from the stand into the roll-changing vehicle; the roll-changing vehicle horizontally traverses, and pushes the new intermediate roll and work roll into the stand. After the roll change is completed, the roll-changing vehicle drives backward to the original parking position. The entire roll-changing process has a high degree of automation and short time consumption, thus ensuring the stable and high output of the rolling mill.

[0004] When the used intermediate roll and work roll removed from the stand are clamped by the trolley clamp on the roll-changing vehicle and extracted onto the vehicle, under the traction of the extraction trolley, the gears on the trolley roll on the rack on the roll-changing vehicle and move backward, and the lower sliding plate of the bearing block contacts the guide rail of the roll-changing vehicle and slides backward along the guide rail. Limit blocks are respectively installed on the left and right guide rails at the rear of the roll-changing vehicle. After the roll moves backward for a certain distance, the bearing block touches the limit block and the roll stops moving. The extraction trolley continues to move backward. When it touches the electrical limit switch, the extraction trolley stops. The limit block of the intermediate roll blocks the front surface of the bearing block, and the work roll limit block blocks in front of the operating arm of the bearing block.

[0005] The dimensions of the upper and lower bearing blocks on the operating side in the width direction are different. The upper bearing block is 100mm wider than the lower bearing block. The widest part of the bearing block locking device (commonly known as the door-shaped frame and operating arm) on the operating side is 780mm, and the total length of the bearing block on the operating side is 1210mm. There are two grooves on the left and right of the operating arm respectively. The main function of the locking device: After the trolley on the roll-changing vehicle pushes the roll into the stand, the hydraulic cylinders on both sides of the operating side of the stand extend and insert into the grooves of the operating arm, so that the bearing block on the operating side is fixed in the stand, while the bearing block on the drive side has no locking device and is floating in the stand.

[0006] The weight of a pair of work rolls is 16.5T, and the hoisting onto the roll-changing car track is divided into 5 steps: ① First, hoist a pair of work rolls above the idle position of the roll-changing car and roughly adjust the roll axis to be at the center of the position. ② Horizontally move the work rolls backward towards the rear of the roll-changing car, and the moving distance must be greater than 1210mm. ③ Then, vertically lower the rolls, and the lowering distance is greater than 880mm. ④ Horizontally move the work rolls forward towards the front of the roll-changing car. After the operating arm crossbeam is located inside the work roll limit block, the rolls are vertically lowered again and land on the track of the roll-changing car. ⑤ Remove the wire rope hanging on the rolls and take out the spacer block between the upper and lower work roll bearing seats, and the standby operation of the work rolls ends.

[0007] Judging from the hoisting steps of the work roll standby, the hoisting process is cumbersome, time-consuming, and extremely unsafe. The inner width space of the roll-changing car position is limited. To accurately land a pair of rolls on the track, the overhead crane needs to repeatedly adjust the rolls horizontally and vertically. In addition, during the adjustment process, due to the swing of the lifted object, it is very difficult to quickly and correctly position the rolls. The roll-changing car was originally designed with a high degree of automation, but due to design defects during the standby process of the rolls, the standby efficiency is not high and it does not match the automated equipment.

[0008] The reason for this hoisting difficulty is caused by the two limit blocks on the middle roll track. The distance between the two limit blocks is 682mm, while the width of the upper work roll operating arm is 740mm, and with two stop blocks added, the widest part is 780mm. Therefore, it is impossible to vertically hoist a pair of work rolls into the roll-changing car. It is necessary to move forward and backward horizontally, lower, and other actions to avoid the limit blocks of the middle roll. After the work rolls fall onto the track, the operator jumps into the roll-changing car again to take out the spacer block between the upper and lower work rolls. Summary of the Invention

[0009] To solve the above technical problems, the purpose of the present invention is to improve this hoisting method to achieve safe and fast hoisting and standby of rolls; the specific technical solutions are as follows:

[0010] A hoisting method capable of achieving safe and fast standby of rolls on a roll-changing car. The distance between the two guide rails of the middle roll is 765mm, the distance of the middle roll without installing the guide rails and limit blocks is 835mm, and the length is 1340mm. The following optimization method design is carried out according to the characteristics of the roll-changing car structure;

[0011] ① The limit block a is the limit device on the guide rails of each roll of the roll-changing car before improvement; now remove the limit block a on the upper middle roll guide rail;

[0012] ② Design and manufacture a new limit block b, and install the new limit block b using the crossbeam at the rear of the roll-changing car, or weld the limit block b to the rear of the roll-changing car for the limiting function of the upper middle roll;

[0013] ③ After the height of the limit block b is appropriately increased, it blocks directly in front of the intermediate roll operating arm. After the optimized design, the position of the limit block b on the intermediate roll track has changed, but its function remains the same;

[0014] ④ Make a simple cross hook, and additionally weld M16 nuts at the centers on both sides of the work roll cushion block; after the work roll falls onto the roll changing car track, screw one end of the hook into the nut on the cushion block to extract the cushion block;

[0015] Make a simple inserting frame tool according to the cushion block installed between the upper and lower work roll bearing seats. When hoisting the work roll off the machine, first insert the inserting frame into the steel pipe screw holes on both sides of the cushion block, so as not to repeatedly jump into the roll changing car to extract or install the cushion block;

[0016] The preferred embodiment of the hoisting method capable of safely and quickly preparing the roll on the roll changing car is that the limit block b includes a connecting plate, an adjusting gasket, left and right guide rail support frames, a channel-shaped stop iron and screws;

[0017] The channel-shaped stop iron is stuck on the columns of the left and right guide rails, and the channel-shaped stop iron is flush with the crossbeam base;

[0018] The connecting plate is a T-shaped plate, which is arranged on the upper end surfaces of the channel-shaped stop iron and the crossbeam base; one side of the connecting plate is fixed to the guide rail through screws with the channel-shaped stop iron, and the other side is tightly fixed to the crossbeam base through bolts. The left and right guide rail support frames are installed on the guide rails;

[0019] Adjusting gaskets for adjusting the gap are arranged in the groove of the channel-shaped stop iron. By installing two M16 jackscrews below the channel-shaped stop iron and tightening them, the adjusting gaskets are fixed on the guide rail.

[0020] The preferred embodiment of the hoisting method capable of safely and quickly preparing the roll on the roll changing car is that the cross hook is made of φ16 steel bar, and a thread of M16×50 is sleeved on the front end of the hook. The hook is 1300 mm long, and the width of the cross handle at the back is 300 mm.

[0021] The preferred embodiment of the hoisting method capable of safely and quickly preparing the roll on the roll changing car is that the inserting frame is made of steel pipe, and a φ18×50 cylindrical pin is welded at the front end of the inserting frame, and the center distance is 510 mm.

[0022] The hoisting method capable of safely and quickly preparing the roll on the roll changing car is characterized in that: the appropriate height of the limit block b is the superimposed height of the channel-shaped stop iron and the connecting plate. The height of the channel-shaped stop iron is 162 mm, and the thickness of the connecting plate is 20 mm.

[0023] The preferred embodiment of the hoisting method capable of safely and quickly preparing the roll on the roll changing car is that the optimized roll changing steps are as follows:

[0024] 1) When extracting the used old intermediate rolls and work rolls from the rack to the roll changing car, the old single upper intermediate roll should be lifted away first.

[0025] 2) Then lift the old work rolls vertically in pairs. At this time, the cushion blocks should be placed between the upper and lower work roll bearing seats.

[0026] 3) Move the roll changing car to the 1 - 3rd layer and lift away the old single lower intermediate roll.

[0027] 4) When replacing the rolls, prepare a pair of work rolls first. Before entering the roll changing car, the work rolls are lifted in pairs. When lifting, the cushion blocks are placed between the upper and lower work rolls to prevent contact between them. At this time, a pair of work rolls can be vertically lifted onto the work roll track of the roll changing car at one time.

[0028] 5) After the work rolls are placed in position on the track of the roll changing car, the cushion blocks should be taken out.

[0029] 6) Prepare the upper intermediate roll and lift it singly above the roll changing car, then lower the upper intermediate roll onto the guide rail of the upper intermediate roll on the roll changing car.

[0030] 7) Move the 1 - 3rd layer of the roll changing car horizontally, prepare the lower intermediate roll, and lower the lower intermediate roll onto the guide rail of the lower intermediate roll on the roll changing car.

[0031] 8) Move the 1 - 3rd layer of the roll changing car horizontally in the reverse direction to return to its original position. Now, a pair of work rolls and a pair of intermediate rolls are ready on the roll changing car.

[0032] Advantages of the present invention: The present invention designs a new upper intermediate roll limit block b. The original limit block a of the intermediate roll obstructs the front surface of the intermediate roll box body. After removal, since there is no guide rail installed at the rear, its width is much larger than the width of the work roll operating arm. The present invention makes full use of the structural characteristics of the original roll changing car, with little modification, low cost for manufacturing the new block, and quick results. It realizes one - step lifting of the work rolls. The operator does not need to work at height and can command the overhead crane on the ground, eliminating potential safety hazards. The purpose of the present invention is to achieve safe and fast roll lifting, enabling the operator not to climb up and down on the roll changing car, eliminating existing safety hazards, and realizing quality - based safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 Schematic diagram of the situation where the upper intermediate roll is parked at the rear of the roll changing car before the improvement of the limit block a;

[0034] Figure 2 Schematic diagram of the position of the improved limit block b blocking in front of the operating arm of the upper intermediate roll after the position change;

[0035] Figure 3Schematic diagram of the connection parts between the groove-shaped stop in the limit block b and the connection plate;

[0036] Figure 4 Schematic diagram of the connection plate assembly structure;

[0037] Figure 5 Plan view of the roll layout on the roll changing car.

[0038] Wherein: 1 - limit block a, 2 - limit block b, 3 - connection plate, 4 - groove-shaped stop, 5 - guide rail support frame, 6 - adjusting shim, 7 - screw, 8 - column, 9 - crossbeam base. Specific implementation method

[0039] As Figures 1-5 It can be seen a hoisting method that can achieve safe and fast roll preparation on the roll changing car. The distance between the two guide rails of the intermediate roll is 765 mm, the distance of the intermediate roll without installing the guide rails and limit blocks is 835 mm, and the length is 1340 mm. The following optimization method design is carried out according to the characteristics of the roll changing car structure;

[0040] ① The limit block a1 is the limit device on the guide rails of each roll of the roll changing car before improvement; now the limit block a1 on the upper intermediate roll guide rail is removed;

[0041] ② Design and manufacture a new limit block b2, and use the crossbeam at the rear of the roll changing car to install the new limit block b2, or weld the limit block b2 to the rear of the roll changing car for the limit function of the upper intermediate roll;

[0042] ③ After increasing the appropriate height of the limit block b2, it blocks directly in front of the operating arm of the intermediate roll. The position of the optimized limit block b2 on the intermediate roll track has changed, but the function remains the same;

[0043] ④ Make a simple cross hook, and weld M16 nuts on the centers of both sides of the work roll pad respectively; after the work roll falls onto the roll changing car track, screw one end of the hook into the nut on the pad to extract the pad;

[0044] Make a simple plug-in tool according to the pads installed between the upper and lower work roll bearing seats. When hoisting the work roll off the machine, first insert the plug-in tool into the steel pipe screw holes on both sides of the pad, and there is no need to repeatedly jump into the roll changing car to extract or install the pad;

[0045] The described hoisting method that can achieve safe and fast roll preparation on the roll changing car, and its preferred scheme is that the limit block b2 includes a connection plate 3, an adjusting shim 6, left and right guide rail support frames 5, a groove-shaped stop 4 and screws 7;

[0046] The groove-shaped stop 4 is stuck on the column 8 of the left and right guide rails, and the groove-shaped stop 4 is flush with the crossbeam base 9;

[0047] The connecting plate 3 is a T-shaped plate and is arranged on the upper end surfaces of the channel-shaped stop 4 and the crossbeam base 9; one side of the connecting plate 3 is fixed to the channel-shaped stop 4 on the guide rail by screws 7, and the other side is tightly fixed to the crossbeam base 9 by bolts. The left and right guide rail supports 5 are installed on the guide rail;

[0048] Adjusting gaskets for adjusting the clearance are arranged in the groove of the channel-shaped stop 4. By installing two M16 setscrews below the channel-shaped stop 4 and tightening them, the adjusting gasket 6 is fixed on the guide rail.

[0049] The cross hook is made of a φ16 steel bar, and a thread of M16×50 is sleeved on the front end of the hook. The length of the hook is 1300 mm, and the width of the cross handle at the back is 300 mm.

[0050] The inserting frame is made of steel pipes, and a φ18×50 cylindrical pin is welded at the front end of the inserting frame, and the center distance is 510 mm.

[0051] The appropriate height of the limit block b is the superposed height of the channel-shaped stop and the connecting plate. The height of the channel-shaped stop is 162 mm, and the thickness of the connecting plate is 20 mm.

[0052] A hoisting method that can realize safe and fast roll preparation on the roll-changing vehicle. The preferred solution is that the optimized roll-changing steps are as follows:

[0053] 1) When the used old intermediate roll and work roll are extracted from the rack to the roll-changing vehicle, the old single upper intermediate roll should be lifted away first;

[0054] 2) Then the old work rolls are hoisted vertically in pairs. At this time, the cushion blocks need to be placed between the upper and lower work roll bearing seats;

[0055] 3) Move the roll-changing vehicle to the 1-3rd layer and lift away the old single lower intermediate roll;

[0056] 4) When replacing the new rolls, a pair of work rolls prepared in advance. Before entering the roll-changing vehicle, the work rolls are hoisted in pairs. When hoisting, the cushion blocks are placed between the upper and lower work rolls to prevent contact between the upper and lower work rolls; at this time, a pair of work rolls can be vertically hoisted onto the work roll track of the roll-changing vehicle at one time;

[0057] 5) After the work rolls are placed in place on the track of the roll-changing vehicle, the cushion blocks should be taken out;

[0058] 6) Prepare the upper intermediate roll and hoist it singly above the roll-changing vehicle, and lower the upper intermediate roll onto the guide rail of the upper intermediate roll on the roll-changing vehicle;

[0059] 7) Horizontally move the 1-3rd layer of the roll-changing vehicle, prepare the lower intermediate roll, and lower the lower intermediate roll onto the guide rail of the lower intermediate roll on the roll-changing vehicle;

[0060] 8) Move the roll changing car 1-3 layers in the opposite direction and return them to their original positions. Now a pair of working rolls and a pair of intermediate rolls are ready on the roll changing car.

[0061] Key points of the present invention

[0062] (1) After the position of the upper intermediate roll limit block is changed, the limit block's limiting function remains unchanged. The inner width of the intermediate roll track is 765 mm, the width of the upper work roll bearing seat operating arm is 740 mm, and the resulting spacing is 25 mm.

[0063] The maximum width of the working roll operating arm with iron stop is 780mm. However, the width of the upper intermediate roll, where the guide rail is not installed, is 835mm, resulting in a 55mm gap. This allows the pair of working rolls to be hoisted to the appropriate position above the roll-changing vehicle and then accurately lowered vertically onto the track. This eliminates the need for Tiancheng to move forward and backward in the horizontal direction, lower, and other movements to avoid the stop blocks of the intermediate rolls. This simplifies the hoisting process and allows for a one-step installation. The hoisting process is simpler and less time-consuming than before the improvement, and no manual labor is required to reach the stop blocks of the intermediate rolls.

[0064] (2) The newly designed limit block B has a simple structure and is easy to adjust. Using the beam at the rear of the roller changing vehicle, the limit block connecting plate is installed on the beam base and tightened with bolts.

[0065] (3) If you want the newly designed limit block to be permanently fixed on the roller changing vehicle, you can weld the slot limit block to the guide rail.

[0066] (4) The simple pad extraction tool and insert spanner are simple and practical. After using this tool to extract the pad, the operator does not need to repeatedly jump into the roller to remove or install the pad, achieving inherent safety and eliminating personal safety hazards.

[0067] (5) The roll-changing car was designed by SMS Germany. The present invention has been improved based on actual production conditions. After the position of the intermediate roll pad is changed, the working roll can be safely and quickly lifted, which improves the working efficiency and reduces the labor intensity of the operator. It is worth promoting.

Claims

1. A hoisting method capable of achieving safe and rapid roll preparation on a roll-changing vehicle, characterized in that: The distance between the two guide rails of the intermediate roll is 765 mm. The distance of the intermediate roll without installing the guide rails and limit blocks is 835 mm, and the length is 1340 mm. The following optimization method design is carried out according to the characteristics of the roll changing car structure; ① The limit block a is the limit device on the guide rails of each roll of the roll changing car before improvement; now remove the limit block a on the upper intermediate roll guide rail; ② Design and manufacture a new limit block b, and install the new limit block b by using the cross beam at the rear of the roll changing car, or weld the limit block b to the rear of the roll changing car for the limit function of the upper intermediate roll; ③ After the height of the limit block b is increased, it blocks in the front of the operation arm of the intermediate roll. The position of the optimized limit block b on the intermediate roll track changes, but the function remains unchanged; The height of the limit block b is the superposition height of the channel-shaped stop and the connecting plate. The height of the channel-shaped stop is 162 mm, and the thickness of the connecting plate is 20 mm; ④ Make a simple cross hook, and weld M16 nuts on both sides of the center of the work roll pad respectively; after the work roll falls onto the roll changing car track, screw one end of the hook into the nut on the pad and extract the pad; Make a simple plug-in tool according to the pads installed between the upper and lower work roll bearing seats. When hoisting the work roll off the machine, first insert the plug-in into the steel pipe screw holes on both sides of the pad, and there is no need to repeatedly jump into the roll changing car to extract or install the pad; The limit block b includes a connecting plate, an adjusting gasket, left and right guide rail support frames, a channel-shaped stop and screws; The channel-shaped stop is stuck on the columns of the left and right guide rails, and the channel-shaped stop is flush with the cross beam base; The connecting plate is a T-shaped plate, which is arranged on the upper end surfaces of the channel-shaped stop and the cross beam base; and one side of the connecting plate is fixed to the guide rail with the channel-shaped stop by screws, and the other side is tightened and fixed to the cross beam base by bolts. The left and right guide rail support frames are installed on the guide rails; Adjusting gaskets for adjusting the gap are arranged in the groove of the channel-shaped stop. By installing two M16 jackscrews below the channel-shaped stop and tightening them, the adjusting gaskets are fixed on the guide rails.

2. A hoisting method capable of achieving safe and fast roll preparation on a roll-changing vehicle according to claim 1, characterized in that: The cross hook is made of φ16 steel bar, and the front end of the hook is sleeved with a thread of M16×50. The hook is 1300 mm long, and the width of the cross handle at the back is 300 mm.

3. A hoisting method for safely and quickly preparing rolls on a roll-changing vehicle according to claim 1, characterized in that: The plug-in is made of steel pipe, and a φ18×50 cylindrical pin is welded at the front end of the plug-in, and the center distance is 510 mm.

4. A hoisting method capable of safely and quickly preparing rolls on a roll-changing vehicle according to claim 1, characterized in that: The optimized roll changing steps are as follows: 1) When extracting the used old intermediate roll and work roll from the machine frame to the roll changing car, first lift the old single upper intermediate roll; 2) Then vertically lift and hoist the old work rolls in pairs. At this time, place the pads between the upper and lower work roll bearing seats; 3) Move the roll changing car to the 1-3rd layer and lift the old single lower intermediate roll; 4) When replacing the rolls, prepare a pair of work rolls. Before entering the roll changing car, the work rolls are hoisted in pairs. When hoisting, place the pads between the upper and lower work rolls to prevent contact between the upper and lower work rolls; at this time, a pair of work rolls are vertically hoisted onto the work roll track of the roll changing car at one time; 5) After the work rolls are placed in place on the roll changing car track, take out the pads; 6) Prepare the upper intermediate roll, hoist it singly above the roll changing car, and lower the upper intermediate roll onto the guide rail of the upper intermediate roll on the roll changing car; 7) Horizontally move the 1st - 3rd layers of the roll changing car, prepare the lower intermediate roll, and place the lower intermediate roll onto the guide rail of the lower intermediate roll of the roll changing car; 8) Horizontally move the 1st - 3rd layers of the roll changing car in the reverse direction to return to the original position. Now, a pair of work rolls and a pair of intermediate rolls are prepared on the roll changing car.

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