A method for correcting the position of the hanging shaft in the sector segment when the slide rail is deformed.

Abstract

This invention discloses a method for correcting the position of the hanging shaft of a sector segment when the slide rail deforms. Before lowering the lifting device, the hydraulic connection pipeline and electrical control connection cable of the sector segment are removed. Then, the lifting device is lowered. If the lifting device encounters obstruction during lowering, the obstruction position of the gantry connector groove of the lifting device is observed. Hanging shafts #1 and #2 are obstructed on the lower side of the hanging groove. At this time, the two fastening anchor bolts fixing the outlet position of the sector segment can be loosened. Then, two hydraulic jacks are erected on the upper frame position of the adjacent lower sector segment to push the replaced sector segment upward. While pushing, the jacks are observed. When the two obstructed sector segment hanging shafts are completely disengaged from the edge of the hanging groove and no longer interfere, the upward pushing of the sector segment is stopped, and the crane is directed to continue lowering the lifting device. If there is still obstruction and interference during the descent of the lifting device, the lifting height of the jacks on both sides is adjusted to achieve the final downward movement of the lifting device. The gantry lifting device pin is installed, and then the sector segment is lifted.

Description

Technical Field

[0001] This invention relates to a method for correcting the position of the hanging shaft in the sector section when the slide rail deforms, belonging to the field of steelmaking continuous casting technology. Background Technology

[0002] Most slab continuous casting machines are arc-shaped, with the arc section and straightening section arranged on a quarter-circle arc surface. The entire arc base is called a banana base, and the sector segment is mounted on it. Because of its weight and its location on the arc surface, the sector segment is replaced via slide rails on either side of the banana base, with the plane of the slide rails perpendicular to the plane of the sector segment. A crane with a special lifting device for the sector segment is used for replacement.

[0003] The sector segment lifting device consists of lifting lugs, roller assembly, ladder-shaped hanger, portal frame connector, and pins. Before replacing the sector segment, disconnect the hydraulic pipes and connecting cables of the sector segment to be replaced. Then, align the lifting device with the slide rail of the sector segment to be replaced, allowing the lifting device to slide down along the slide rail to the bottom, ensuring that the four hanging shafts of the sector segment are fully inserted into the hanging grooves on both sides of the portal frame connector. Pin holes are opened at the bottom of the hanging grooves. Insert the pins into the pin holes to support the two hanging shafts at the bottom. Then, remove the four anchor bolts of the sector segment and lift it out with the crane. During installation, use the lifting device to lift the spare sector segment, slide it down the slide rail to the bottom, and place it on the banana seat. Secure the four corners with anchor bolts to complete the replacement of the sector segment.

[0004] When replacing a sector segment in a slab continuous casting machine, the two adjacent sector segments before and after the segment to be replaced must first be pressed to their lowest positions to prevent collision and interference during segment removal. The four clamping cylinders of the sector segment to be replaced should be kept at the same height. This ensures that the upper and lower frames of the sector segment remain balanced, meaning that the four hanging shafts of the sector segment are all on the same three-dimensional plane perpendicular to the sector segment. The replacement slide rail for the sector segment is located at the plane of the four hanging shafts on both sides of the sector segment. Therefore, after the lifting device slides down the slide rail to the bottom, the pin hole of the portal connector is inserted to support the two lower hanging shafts, and then the crane lifts the sector segment normally along the slide rail. This is the usual operating procedure for replacing sector segments other than the first and second segments. When the continuous casting machine has been in operation for a long time and the lifting device slide rail is significantly deformed, this method often fails to allow the lifting device to slide down properly, especially when replacing a single segment. Because the horizontal inclination angle of a section of the slide rail is between 15° and 20°, the force analysis of the object sliding down the inclined plane when the lifting device is lowered shows that the downward force G2 = G × sinα. The smaller the angle α, the smaller the downward force G2. Especially when the slide rail is deformed, the frictional resistance of the lifting device will increase. The trapezoidal lifting device of the sector section is flexible as a whole, and the chain links can be bent, so it will still overcome the resistance and descend along the deformed guide roller. However, the entire lifting device is deformed during the descent. When the lower portal joint of the lifting device reaches the upper hanging shaft position of the sector section, because the size of the hanging shaft is only slightly smaller than the size of the hanging groove of the portal joint, the deformed portal lifting device is blocked by the upper hanging shaft of the sector section and cannot continue to descend to the position. In this situation, the usual practice of maintenance workers is to raise the lifting device to a certain height and then quickly lower the crane hook, relying on the downward force of the lifting device's gravity to try to get the gantry connector to the lower part of the fan-shaped section's hanging shaft position. However, the actual effect is very poor, often wasting time and frequently damaging equipment, causing greater losses.

[0005] Literature search: A patent (CN104190888B) titled "A Slab Segment and Slab Segment Replacement System" was found. This invention describes a sector segment and its replacement system, including a crane, lifting devices, slide rails, and lifting device pins, primarily focusing on the equipment. While this paper also includes the aforementioned equipment, it describes a unique method for quickly lowering the lifting device into position when the slide rail deforms, thus smoothly lifting out the sector segment for replacement. The main content of the two patents is completely different. Another patent (CN109128069A) titled "A Binary Lifting System and Method for Slab Segments in a Slab Continuous Casting Machine" was also found. This patent describes a method for freely switching between long and short lifting devices to replace sector segments in different positions when converting a small billet continuous casting machine to a slab continuous casting machine under existing plant conditions due to insufficient plant height. The content of this patent is entirely different from the content of this paper. Summary of the Invention

[0006] The purpose of this invention is to provide a method for correcting the position of the hanging shaft of the sector segment when the slide rail is deformed. During the process of replacing the sector segment when the slide rail is deformed, the position of the two hanging shafts at the top of the sector segment is compensated and adjusted so that the hanging groove of the gantry connector can smoothly reach the bottom of the sector segment, thereby allowing the hanging pin to be inserted to complete the lifting of the sector segment and realize the operation method of quickly replacing the sector segment.

[0007] The technical solution adopted in this invention is a method for correcting the position of the hanging shaft of the sector section when the slide rail is deformed. Before lowering the lifting device, the hydraulic connection pipeline and electrical control connection cable of the sector section are removed. Then the lifting device is lowered. After the lifting device encounters obstruction during the lowering, the obstruction position of the gantry connector groove of the lifting device is observed. The hanging shafts #1 and #2 are obstructed on the lower side of the hanging groove. At this time, the two fastening anchor bolts fixing the outlet position of the sector section can be loosened. Then, two hydraulic jacks are supported at the upper frame position of the adjacent lower sector section to push the replaced sector section upward. While pushing, the jacks are observed. When the two obstructed sector section hanging shafts are completely separated from the edge of the hanging groove and no longer interfere, the upward pushing of the sector section is stopped, and the crane is directed to continue lowering the lifting device. If there is still obstruction and interference in the hanging lugs during the descent of the lifting device, the lifting height of the jacks on both sides is adjusted to achieve the final downward movement of the lifting device. The gantry lifting device pin is installed and then the sector section is lifted.

[0008] If the #1 and #2 hanging shafts are stuck on the upper side of the hanging groove, first use a hydraulic jack to tighten the sector section. This is to facilitate loosening the two anchor bolts at the entrance of the sector section. Then loosen the two anchor bolts that fix the entrance of the sector section. Then slowly release the pressure with the hydraulic jack. The arc-shaped sector section will tilt backward under the action of gravity. Observe the position of the two hanging shafts during the pressure release process. After they are completely away from the side of the gantry hanger without interference, continue to lower the hanger. Observe the interference between the hanging lugs and the hanger groove during the lowering process. Use the hydraulic jack to adjust the position of the two hanging lugs of the sector section in time so that the hanger finally slides into place. Install the gantry hanger pin and then lift the sector section.

[0009] The characteristic of this method is that when replacing sector segments 1, 2, and 3, hydraulic jacks are used to compensate and correct the position of the sector segments, so as to quickly complete the disassembly, hoisting, and installation of the sector segments.

[0010] This invention is applicable to the replacement of sector sections in slab continuous casting machines that have been in production for a long time and have significant deformation of the sector section slide rails. The method is practical and reliable, and it is particularly effective when replacing arc-shaped sector sections 1, 2, and 3. It can significantly increase the replacement speed, greatly shorten the maintenance time of the continuous casting machine, and reduce the labor intensity of employees. Attached Figure Description

[0011] Figure 1 This is a schematic diagram showing the positional relationship between the sector-shaped lifting device and the sector-shaped hanging shaft in this invention. Implementation

[0012] A method for correcting the position of the hanging shaft in the sector segment when the slide rail deforms, such as... Figure 1 As shown, before lowering the lifting device 3, first disconnect the hydraulic connection pipeline and electrical control connection cable of the sector section, and then lower the lifting device. If the lifting device encounters obstruction during lowering, observe the obstruction position of the gantry connector groove of the lifting device. The hanging shafts 1# and 2# are obstructed on the lower side of the hanging groove. At this time, the two fastening anchor bolts at the outlet position of the fixed sector section can be loosened. Then, two hydraulic jacks are supported at the upper frame position of the adjacent lower sector section to push the replaced sector section upward. While pushing, observe. When the two obstructed sector section hanging shafts are completely separated from the edge of the hanging groove and no longer interfere, stop pushing the sector section and direct the crane to continue lowering the lifting device. If there is still obstruction and interference in the hanging lugs during the descent of the lifting device, continue to adjust the lifting height of the jacks on both sides to achieve the final downward movement of the lifting device. Install the gantry lifting device pin and then lift the sector section.

[0013] If the hanging shafts 1 and 2 are stuck on the upper side of the hanging groove, first use a hydraulic jack to tighten the sector section. This is to facilitate loosening the two anchor bolts at the entrance of the sector section. Then loosen the two anchor bolts that fix the entrance of the sector section. Then slowly release the pressure with the hydraulic jack. The arc-shaped sector section will tilt backward under the action of gravity. Observe the position of the two hanging shafts during the pressure release process. After they are completely away from the side of the gantry hanger without interference, continue to lower the hanger. Observe the interference between the hanging lugs and the hanger groove during the lowering process. Use the hydraulic jack to adjust the position of the two hanging lugs of the sector section in time so that the hanger finally slides into place. Install the gantry hanger pin and then lift the sector section.

Claims

1. A method for correcting the position of the hanging shaft in a sector segment when a slide rail deforms, characterized in that: Before the hoist is lowered, the hydraulic connection pipeline and the electric control connection cable of the sector segment are removed, and then the hoist is lowered. When the hoist is stuck during the lowering, the stuck position of the door type connector slot of the hoist is observed. The 1# and 2# hanging shafts are stuck on the lower side of the hanging groove. At this time, the two fastening foot bolts at the outlet position of the fixed sector segment are loosened, and then two hydraulic jacks are erected on the adjacent lower sector segment frame position to change the sector segment upward. The sector segment is observed while being jacked up. When the two sector segment hanging shafts are completely separated from the hanging groove side without interference, the jacking up of the sector segment is stopped, the crane is commanded to continue to lower the hoist, and the door type hoist pin is installed to then lift the sector segment. If the 1# and 2# hanging shafts are stuck on the upper side of the hanging groove, the sector segment is first jacked up by the hydraulic jack. The purpose is to facilitate the loosening of the two foot bolts at the inlet of the sector segment. Then the two foot bolts at the inlet of the fixed sector segment are loosened. Then the hydraulic jack is slowly depressurized. The arc sector segment will be tilted backward under the action of gravity. The position of the two hanging shafts is observed during the depressurization process. After the two hanging shafts completely separate from the side of the door type hoist without interference, the hoist is continued to be lowered. The interference between the hanging ear and the hoist slot is observed during the lowering of the hoist. The position of the two hanging ears of the sector segment is adjusted in time by the hydraulic jack to make the hoist finally slide into place. The door type hoist pin is installed to then lift the sector segment.

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