Low-gravity-center hydraulic precise hoisting method for extra-heavy rolling mill stand

Abstract

The embodiment of the invention discloses a low-gravity-center hydraulic precise hoisting method for an extra-heavy rolling mill stand. The low-gravity-center hydraulic precise hoisting method comprises the following steps that a hoisting tool is designed; reinforcing a sliding track bearing foundation; the rack is unloaded from the transport vehicle; preparation work before sliding is carried out; horizontally sliding; the rolling mill stand is lowered in place, after the rolling mill stand reaches the installation position and is overturned from the horizontal state to the completely vertical state in the low gravity center state, the hydraulic lifting system is lowered stably at a constant speed till the rolling mill stand is completely located on the rolling mill bottom plate, and the rolling mill stand is fastened through bolts after being located. And the risk and the labor intensity of operators are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of installation of rolling mill frames in steel mills, and in particular to a low-center-of-gravity hydraulic precision lifting method for an extra-heavy rolling mill frame. Background Art

[0002] In metallurgical engineering projects, the installation quality and accuracy of the extra-heavy plate rolling mill rack and heavy equipment directly affect production stability and product quality. Therefore, the construction unit pays more attention to it, and the construction unit also attaches great importance to the research and development of new construction methods.

[0003] The rolling mill frames of general metallurgical steel plant production lines are usually hoisted into place by bridge cranes, and the cranes in the production line workshop can only meet the production needs; in the implementation of the previous installation methods such as double-machine lifting and traditional rotation balancing method, the lifting and lowering are adjusted by stepped pads. As the equipment size increases, the lifting and lowering stroke also increases. It is found that during the lifting and lowering of the frame, the pad lifting and lowering adjustment synchronization is poor, and the stability is difficult to control. That is, the higher the center of gravity of the equipment, the worse the stability, and there are unfavorable factors such as safety hazards. In addition, the rotation balancing method has a complex process, requires many matching assembly parts, and requires a long period of preparation and assembly in the early stage, which is very time-consuming and labor-intensive. The details are as follows:

[0004] 1. Disadvantages of using cranes in the factory: 1. The lifting capacity of the crane is limited. Even the commonly used double-machine lifting mode cannot meet the lifting capacity of the wide and thick plate rolling mill frame; 2. The wide and thick plate rolling mill frame has large dimensions, with a maximum height of 18 meters. Due to the limited lifting height of the crane,

[0005] 2. Disadvantages of the construction process using the rotation balance method: In the installation process, due to the increase in the overall dimensions of the equipment (16320×5200×2200), after the rack slides into place, the hydraulic jack is used to lift the rack in a horizontal state to a certain height and then rotate the rack to a vertical state, and then gradually lower it and install it on the base; this process has certain safety risks and disadvantages, which are mainly manifested in: 1. During the descent process, the hydraulic jack is manually operated to achieve a step-by-step descent of the rack stroke. The four hydraulic jacks are controlled by four people respectively. The descent speed and synchronization are difficult to control, and the stability of the frame is poor; 2. When the rack is lowered to the base, the inertia of the rack has a certain impact load on the base, which affects the installation accuracy of the base; 3. During the jacking and descent process of the rack, as the jacking (descent) drop increases, the higher the center of gravity, the worse the stability. The column tilt out of tolerance has occurred, which brings great safety hazards to the installation process and operators. Summary of the invention

[0006] The purpose of the present invention is to solve the problems raised in the above-mentioned background technology. The present invention provides a low-center-of-gravity hydraulic precision lifting method for a super-heavy rolling mill frame, which realizes the requirements of synchronous and smooth lifting and reduces the risks and labor intensity of operators.

[0007] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions:

[0008] The method for hydraulic precision lifting of a heavy-duty rolling mill frame with a low center of gravity comprises the following steps:

[0009] (1) Design lifting tools

[0010] The lifting tool includes a hydraulic lifting system, a ladder bracket and a split rotary fixed frame. The hydraulic lifting system is installed on the ladder bracket, and the split rotary fixed frame is installed at the bottom of the hydraulic lifting system. The hydraulic lifting system is used to lift the split rotary fixed frame, and the split rotary fixed frame is used to install the rolling mill.

[0011] (2) Strengthening the bearing foundation of the sliding track

[0012] Lay the translation rails from the unloading position of the rolling mill frame to the installation position;

[0013] (3) Unload the rack from the transport vehicle

[0014] The rolling mill frame is loaded on the transport vehicle in a predetermined state, and enters the predetermined position in the middle of the sliding track of the grinding roller room. The rolling mill frame is placed on the stool through the self-lifting switch of the transport vehicle;

[0015] (4) Preparation work before sliding

[0016] Move the translation trolley to the bottom of the rolling mill frame via the sliding track, remove the pads, place the frame on the main sliding trolley, and support the eccentric tail of the rolling mill frame with another auxiliary sliding trolley, adjust the relative position of the rolling mill frame and the transverse center line, and complete other preparations before translation;

[0017] (5) Slip

[0018] After the hydraulic station is started and operates normally, the horizontal hydraulic cylinder is operated through the sensor remote control device, and the stepping reaction force support of the horizontal hydraulic cylinder is set on the sliding track to push the sliding vehicle forward and move the frame from the unloading position to the installation position;

[0019] (6) Rotating rolling mill frame

[0020] The tail of the rolling mill frame is slowly lowered by a crane, and the rotation center of the rolling mill frame and the split rotary frame rotates under the support of the hydraulic cylinder hinge point;

[0021] (7) Lower the rolling mill frame into place

[0022] After the rolling mill frame reaches the installation position, it is in a low center of gravity state and flipped from a horizontal state to a completely vertical state. The hydraulic lifting system descends at a uniform and stable speed until the rolling mill frame is completely seated on the rolling mill bottom plate. After positioning, it is fastened with bolts.

[0023] Furthermore, in step (5), the tail of the rolling mill frame is hung with a wire rope, and is hoisted and held with an in-span crane, and the auxiliary skid vehicle at the tail is removed.

[0024] Furthermore, in step (6), when the rear end of the frame descends, the hydraulic lifting system is gradually lifted to keep the rear end of the frame from interfering with the bottom plate of the rolling mill.

[0025] Furthermore, in step (5), when the skid vehicle is pushed forward, the horizontal hydraulic cylinders on both sides accurately control the sliding distance and keep the two sides synchronized during the pushing process.

[0026] Furthermore, in step (3), the rolling mill frame is transported by a self-unloading heavy-duty transport vehicle.

[0027] Furthermore, the sliding track is formed by laying and connecting multiple sections of welded H-shaped steel, and the length is determined according to the actual distance; the laying direction of the sliding track is on both sides of the transverse center line of the roughing mill and parallel to the transverse center direction, and the distance between the two tracks is 8800mm.

[0028] Furthermore, ingots are used to pave the bottom of the sliding track to ensure even load transfer and levelness of the track surface; 100 channel steel supports and reinforcements are used on both sides of the single-sided track to ensure stability; the uneven positions of holes or channels on the equipment foundation are filled; temporary supports and reinforcements are set under the translation track across the slag ditch; the foundation of the rolling mill and peripheral equipment is a BOX structure, and temporary supports and reinforcements are adopted for the hollow areas under the translation route track of the rolling mill frame.

[0029] Beneficial effects:

[0030] (1) It realizes the requirements of synchronous and smooth lifting, reducing the risk and labor intensity of operators;

[0031] (2) High working efficiency, shortening the installation period of the rolling mill frame;

[0032] (3) The hydraulic lifting system performs smoothly, greatly reducing the impact load caused by the inertia of the rolling mill frame and ensuring the installation accuracy of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 It is a schematic diagram of the arrangement of the present invention during hoisting;

[0035] Figure 2 A top view of the lifting tool of the present invention;

[0036] Figure 3 It is a left side view of the lifting tool of the present invention;

[0037] Figure 4 It is the front view of the lifting tool of the present invention. DETAILED DESCRIPTION

[0038] To make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0039] The present invention discloses a method for hydraulic precision hoisting of a super heavy rolling mill frame with a low center of gravity, comprising the following steps:

[0040] (1) Design lifting tools

[0041] The lifting tool includes a hydraulic lifting system 1, a trapezoidal bracket 2 and a split rotary fixed frame 3. The hydraulic lifting system 1 is installed on the trapezoidal bracket 2, and the split rotary fixed frame 3 is installed at the bottom of the hydraulic lifting system 1. The hydraulic lifting system 1 is used to lift the split rotary fixed frame 3, and the split rotary fixed frame 3 is used to install a rolling mill; both ends of a rolling mill are installed at two split rotary fixed frames 3.

[0042] Specifically, two trapezoidal brackets 2 are provided and arranged in parallel. The trapezoidal brackets 2 serve as the main bearing frame. Each trapezoidal bracket 2 is composed of an upper bearing beam 21, two legs 22 and a lower sliding beam 23. The two hydraulic lifting systems 1 are respectively installed in the middle of the bearing beam 21.

[0043] A reinforcing beam 4 is installed on the bearing cross beam 21 of the two trapezoidal brackets 2, and both sides of the reinforcing beam 4 are connected to the supporting legs 22 through tie rods 5. The reinforcing beam 4 and the tie rods 5 both play a reinforcing role.

[0044] The rolling mill frame is firmly connected by 10.9 grade high-strength bolts. There are concentric cantilever rotary shafts 31 on both sides of the split rotary fixed frame 3, which can be combined with the hinge point of the hydraulic lifting system 1 to form a rotary device; its function is: the center of gravity of the rolling mill frame is slightly eccentric with the rotation center of the split rotary fixed frame. When the rolling mill frame is suspended by the hydraulic lifting system 1, it can be rotated from a horizontal state to a vertical state in cooperation with the crane in the span.

[0045] (2) Strengthening the bearing foundation of the sliding track

[0046] A translation track is laid from the unloading position of the rolling mill frame to the installation position; the unloading position is the grinding roller room.

[0047] (3) Unload the rack from the transport vehicle

[0048] The rolling mill frame is loaded on the transport vehicle in a predetermined state, and enters the predetermined position in the middle of the sliding track of the grinding roller room. The rolling mill frame is placed on the stool through the self-lifting switch of the transport vehicle;

[0049] (4) Preparation work before sliding

[0050] Move the translation trolley to the bottom of the rolling mill frame via the sliding track, remove the pads, place the frame on the main sliding trolley, and support the eccentric tail of the rolling mill frame with another auxiliary sliding trolley, adjust the relative position of the rolling mill frame and the transverse center line, and complete other preparations before translation;

[0051] (5) Slip

[0052] After the hydraulic station is started and operates normally, the horizontal hydraulic cylinder 6 is operated by the sensor remote control device to use the stepping reaction force support 7 of the horizontal hydraulic cylinder 6 set on the sliding track to push the sliding vehicle forward and move the frame from the unloading position to the installation position;

[0053] (6) Rotating rolling mill frame

[0054] The tail of the rolling mill frame is slowly lowered by a crane, and the rolling mill frame and the rotation center of the split rotary frame 3 rotate under the support of the hydraulic cylinder hinge point;

[0055] (7) Lower the rolling mill frame into place

[0056] After the rolling mill frame reaches the installation position, it is in a low center of gravity state and flipped from a horizontal state to a completely vertical state. The hydraulic lifting system descends at a uniform and stable speed until the rolling mill frame is completely seated on the rolling mill bottom plate. After positioning, it is fastened with bolts.

[0057] In one embodiment of the present invention, in step (5), the tail of the rolling mill frame is hung with a wire rope, hoisted and held with an in-span crane, and the auxiliary sliding vehicle at the tail is removed.

[0058] In one embodiment of the present invention, in step (6), when the rear end of the frame descends, the hydraulic lifting system is gradually lifted to keep the rear end of the frame from interfering with the bottom plate of the rolling mill.

[0059] In one embodiment of the present invention, in step (5), when the skid vehicle is pushed forward, the horizontal hydraulic cylinders on both sides accurately control the sliding distance and keep the two sides synchronized during the pushing process.

[0060] In one embodiment of the present invention, in step (3), the rolling mill frame is transported by a self-unloading heavy-duty transport vehicle.

[0061] In one embodiment of the present invention, the sliding track is formed by laying and connecting multiple sections of welded H-shaped steel, and the length is determined according to the actual distance; the laying direction of the sliding track is parallel to the transverse center line of the roughing mill and the distance between the two tracks is 8800mm. The size of the H-shaped steel is H600*450*25*30.

[0062] In one embodiment of the present invention, a casting billet is used for padding under the sliding track, and the size of the casting billet is 12m*1.8m*0.2m. To ensure even load transmission and horizontality of the upper surface of the track, 100 channel steel support and reinforcement are used on both sides of the single-side track to ensure stability, and the uneven positions of the holes or channels on the equipment foundation are filled; temporary support reinforcement is set under the translation track across the slag flushing groove; the foundation of the rolling mill and peripheral equipment is a BOX structure, and temporary support reinforcement is adopted for the hollow parts under the translation route track of the rolling mill frame.

[0063] The present invention controls the synchronous lifting and lowering of two hydraulic lifting systems and the synchronous translation of the translation hydraulic cylinder, and overcomes the shortcomings of the previous scheme that the four-person control is not synchronous and the high center of gravity of the load-bearing frame is poor in stability, realizes the requirements of synchronous and stable lifting, and reduces the risk and labor intensity of the operators;

[0064] In addition, the present invention has the following advantages:

[0065] 1) High working efficiency, shortening the installation period of the rolling mill frame;

[0066] 2) The hydraulic cylinder performs smoothly, which greatly reduces the impact load caused by the inertia of the rolling mill frame and ensures the installation accuracy of the equipment.

[0067] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for high-heavy rolling mill frame with low center of gravity hydraulic precision lifting, characterized in that: The following steps are involved: (1) Design lifting tools The lifting tool includes a hydraulic lifting system, a ladder bracket and a split rotary fixed frame. The hydraulic lifting system is installed on the ladder bracket, and the split rotary fixed frame is installed at the bottom of the hydraulic lifting system. The hydraulic lifting system is used to lift the split rotary fixed frame, and the split rotary fixed frame is used to fix the rolling mill frame. (2) Strengthening the bearing foundation of the sliding track Lay the translation rails from the unloading position of the rolling mill frame to the installation position; (3) Unload the rack from the transport vehicle The rolling mill frame is loaded on the transport vehicle in a predetermined state, and enters the predetermined position in the middle of the sliding track of the grinding roller room. The rolling mill frame is placed on the stool through the self-lifting switch of the transport vehicle; (4) Preparation work before sliding Move the translation trolley to the bottom of the rolling mill frame via the sliding track, remove the pads, place the frame on the main sliding trolley, and support the eccentric tail of the rolling mill frame with another auxiliary sliding trolley, adjust the relative position of the rolling mill frame and the transverse center line, and complete other preparations before translation; (5) Slip After the hydraulic station is started and operates normally, the horizontal hydraulic cylinder is operated through the sensor remote control device, and the stepping reaction force support of the horizontal hydraulic cylinder is set on the sliding track to push the sliding vehicle forward and move the frame from the unloading position to the installation position; (6) Rotating rolling mill frame The tail of the rolling mill frame is slowly lowered by a crane, and the rotation center of the rolling mill frame and the split rotary frame rotates under the support of the hydraulic cylinder hinge point; (7) Lower the rolling mill frame into place After the rolling mill frame reaches the installation position, it is in a low center of gravity state and flipped from a horizontal state to a completely vertical state. The hydraulic lifting system descends at a uniform and stable speed until the rolling mill frame is completely seated on the rolling mill bottom plate. After positioning, it is fastened with bolts.

2. The method for high-heavy rolling mill frame low-center-of-gravity hydraulic precision hoisting according to claim 1 is characterized in that: In step (5), the tail of the rolling mill frame is hung with a wire rope, and is hoisted and held with an in-span crane, and the auxiliary skid car at the tail is removed.

3. The method for high-heavy rolling mill frame low-center-of-gravity hydraulic precision hoisting according to claim 1 is characterized in that: In step (6), when the rear end of the frame descends, the hydraulic lifting system is gradually lifted to keep the rear end of the frame from interfering with the bottom plate of the rolling mill.

4. The method for high-heavy rolling mill frame low-center-of-gravity hydraulic precision hoisting according to claim 1 is characterized in that: In step (5), when the skid steer is pushed forward, the horizontal hydraulic cylinders on both sides accurately control the sliding distance and keep the two sides synchronized during the pushing process.

5. The method for accurate hydraulic lifting of a super heavy rolling mill frame with a low center of gravity according to claim 1 is characterized in that: In step (3), the rolling mill frame is transported by a self-unloading heavy-duty transport vehicle.

6. The method for accurate hydraulic lifting of a super heavy rolling mill frame with a low center of gravity according to claim 1, characterized in that: The sliding track is made of multiple sections of welded H-shaped steel laid and connected, and the length is determined according to the actual distance; the sliding track is laid on both sides of the transverse center line of the roughing mill and parallel to the transverse center direction, and the distance between the two tracks is 8800mm.

7. The method for accurate hydraulic lifting of a super heavy rolling mill frame with a low center of gravity according to claim 1, characterized in that: Cast billets are used to pave the bottom of the sliding track to ensure even load transfer and levelness of the track surface. 100 channel steel supports and reinforces are used on both sides of the single-sided track to ensure stability, and the uneven positions of holes or channels on the equipment foundation are filled; temporary supports and reinforcements are set under the translation track across the slag ditch; the foundation of the rolling mill and peripheral equipment is a BOX structure, and temporary supports and reinforcements are adopted for the hollow areas under the translation route track of the rolling mill frame.

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