A method for replacing the hydraulic cylinder of the step-type cooling bed

Abstract

The present invention discloses a method for replacing a lifting hydraulic cylinder of a step-type cooling bed, which belongs to the technical field of metallurgical equipment maintenance, and aims to improve the equipment maintenance efficiency and ensure the safety of equipment and personnel. The technical scheme is that the tools used in the method include a baffle, an upper wire rope, a hand chain hoist, a lower wire rope, a jack, a hydraulic jack, a connector, a lower safety pin and an upper safety pin, and the replacement steps are as follows: A. Preparation before disassembling the lifting hydraulic cylinder; B. Disassembling the lifting hydraulic cylinder; C. Pre-installing a new lifting hydraulic cylinder; D. Installing the upper pin and the lower pin of the lifting hydraulic cylinder. The present invention uses the ingenious cooperation of the hand chain hoist, the hydraulic jack and the safety pin to accurately adjust the position of the lifting hydraulic cylinder and the longitudinal beam, eliminate the acting force between the longitudinal beam and the lifting hydraulic cylinder, and align the bearing holes of the front and rear ears of the lifting hydraulic cylinder with the pin holes on the support. It can not only improve the equipment maintenance efficiency, but also eliminate the potential safety of accidents, and ensure the safety of equipment and personnel.

Description

Technical Field

[0001] The invention relates to a method for replacing a lifting hydraulic cylinder of a stepping cooling bed of a continuous casting system, and belongs to the technical field of metallurgical equipment maintenance. Background Art

[0002] The function of the walking cooling bed of the continuous casting system of the steel plant is to make the hot castings evenly and fully cooled during the conveying process of the cooling bed. The walking cooling bed includes a fixed mechanism, a movable mechanism, four lifting hydraulic cylinders and two translation hydraulic cylinders. The fixed mechanism is composed of a fixed tooth plate bracket and a fixed tooth plate. The movable mechanism is composed of two longitudinal beams, five cross beams, a movable tooth plate bracket and a movable tooth plate. The fixed tooth plate bracket and the fixed tooth plate are fixedly installed along the direction of the billet movement. The five cross beams of the movable mechanism are arranged horizontally and parallel. The five cross beams are connected to the bottom of the fixed tooth plate bracket. The five cross beams are perpendicular to the fixed tooth plate bracket. The two longitudinal beams are connected in parallel to the bottom of the five cross beams. The two longitudinal beams are perpendicular to the five cross beams. Each longitudinal beam is connected to two lifting hydraulic cylinders and one translation hydraulic cylinder respectively. The cylinder bodies of the two lifting hydraulic cylinders are hinged to the foundation, and the hydraulic push rods are hinged to the longitudinal beams. The walking cooling bed of the continuous casting machine is in full load working state during continuous casting production. Once the lifting hydraulic cylinder of the cooling bed fails, it must be replaced in time. Since the cooling bed lifting hydraulic cylinder is heavy and is always under pressure from the longitudinal beam, it is very difficult to replace. The traditional replacement method not only has low work efficiency, but also cannot guarantee the safety of equipment and personnel. Summary of the invention

[0003] The purpose of the present invention is to provide a method for replacing a hydraulic cylinder for lifting a step cooling bed in order to improve the equipment maintenance efficiency and ensure the safety of equipment and personnel.

[0004] To achieve the above object, the present invention adopts the following technical solution:

[0005] A method for replacing a lifting hydraulic cylinder of a step-type cooling bed, wherein the tools used in the method include a baffle, an upper wire rope, a hand chain hoist, a lower wire rope, a top bar, a hydraulic jack, a connecting piece, a lower safety pin shaft and an upper safety pin shaft, and the replacement steps of the lifting hydraulic cylinder are as follows:

[0006] A. Preparation before removing the lifting hydraulic cylinder:

[0007] ① Stop the step-by-step cooling bed, stop the pump and release the pressure at the hydraulic station, close the valve leading to the lifting hydraulic cylinder, and remove the high-pressure oil pipe connected to the step-by-step cooling bed;

[0008] ② Weld a baffle plate on the upper part of the longitudinal beam and make it located obliquely above the lifting hydraulic cylinder. The upper end of the upper wire rope is bolted to the longitudinal beam and clamped to the baffle plate. The lower end is hung with a hand chain hoist. The lower wire rope is bolted to the middle of the lifting hydraulic cylinder and connected to the hook of the hand chain hoist. The hydraulic jack is placed just below the longitudinal beam. The lower end of the jack is placed on the hydraulic jack, and the upper end is pressed against the lower surface of the longitudinal beam.

[0009] ③ Weld the connector between the upper front ear and the cylinder barrel of the lifting hydraulic cylinder;

[0010] ④ Remove the accessories of the upper and lower pins of the lifting hydraulic cylinder (including the pin clamp, etc.);

[0011] B. Remove the lifting hydraulic cylinder:

[0012] ① Operate the hydraulic jack to lift the longitudinal beam with the jacking bar until the upper pin shaft is no longer under pressure from the longitudinal beam;

[0013] ②Remove the upper pin shaft;

[0014] ③ Release the hand chain hoist to tilt the lifting hydraulic cylinder to a certain angle, and the front ear of the lifting hydraulic cylinder leaves the upper support of the hydraulic cylinder;

[0015] ④ Remove the lower pin shaft. After removing the lower pin shaft from the lower support of the hydraulic cylinder, insert the lower safety pin shaft into the pin shaft hole of the lower support of the hydraulic cylinder;

[0016] ⑤ Use an overhead crane to lift out the lifting hydraulic cylinder;

[0017] C. Pre-install new lifting hydraulic cylinder

[0018] ① Use an overhead crane to lift the new lifting hydraulic cylinder, place the lower rear ear of the new lifting hydraulic cylinder into the lower support of the hydraulic cylinder, and insert the lower safety pin into the pin hole of the lower support of the hydraulic cylinder;

[0019] ② Bolt the lower wire rope to the middle of the new lifting hydraulic cylinder and connect it to the hook of the hand chain hoist, tighten the hand chain hoist, let the overhead crane unhook, and then tighten the hand chain hoist to make the front ear of the lifting hydraulic cylinder enter the upper support of the hydraulic cylinder, and insert the upper safety pin into the pin hole of the upper support of the hydraulic cylinder;

[0020] D. Install the upper and lower pins of the lifting hydraulic cylinder

[0021] ①Install the upper pin of the lifting hydraulic cylinder: first adjust the left and right position of the front ear bearing hole of the lifting hydraulic cylinder by hand chain hoist so that it is located directly below the pin hole of the upper support of the hydraulic cylinder, and then adjust the up and down position of the pin hole of the upper support of the hydraulic cylinder by hydraulic jack. When the front ear bearing hole of the lifting hydraulic cylinder is aligned with the pin hole of the upper support of the hydraulic cylinder, replace the upper safety pin with the upper pin;

[0022] ②Install the lower pin of the lifting hydraulic cylinder: Use the hand chain hoist to adjust the left and right position of the rear ear bearing hole of the lifting hydraulic cylinder so that it is located directly above the pin hole of the lower support of the hydraulic cylinder. Then use the hydraulic jack to adjust the up and down position of the rear ear bearing hole of the lifting hydraulic cylinder. When the rear ear bearing hole of the lifting hydraulic cylinder is aligned with the pin hole of the lower support of the hydraulic cylinder, replace the lower safety pin with the lower pin.

[0023] ③Install the accessories of the upper and lower pins (including pin clamps, etc.), install the high-pressure oil pipe connected to the step cooling bed, open the valve leading to the lifting hydraulic cylinder, and complete the replacement of the lifting hydraulic cylinder.

[0024] The above-mentioned method for replacing the hydraulic cylinder of the stepping cooling bed lifting, the method for removing the upper pin shaft and the lower pin shaft includes a sledgehammer knocking method and a destructive removal method. When removing, the sledgehammer knocking method is first used. If the operation of the sledgehammer knocking method cannot loosen the upper pin shaft or the lower pin shaft, the destructive removal method is used;

[0025] The sledgehammer striking method is:

[0026] Use a sledgehammer to hit the upper or lower pin. If the upper or lower pin is loose but the moving speed is less than the set value, apply lubricating oil or loosening fluid to the upper or lower pin to remove rust and increase the disassembly speed.

[0027] The destructive demolition method is:

[0028] Use an oxyacetylene flame to burn a through hole with a diameter smaller than that of the upper or lower pin along its axis starting from the center of the end face of one end of the upper or lower pin, so that the upper or lower pin becomes a "tube". Then use an oxyacetylene flame to burn off one quarter of the circumference of the "tube". Finally, use a sledgehammer to hit the remaining "tube" with a C-shaped cross-section until it is removed.

[0029] In the above-mentioned replacement method of the step-type cooling bed lifting hydraulic cylinder, when the upper pin or the lower pin is removed by the destructive removal method, the diameter of the through hole burned on the upper pin or the lower pin is 60%-80% of the diameter of the upper pin or the lower pin.

[0030] The above-mentioned method for replacing the hydraulic cylinder for lifting the step cooling bed, the tiger includes a push rod and a handle, the push rod is made of round steel, its diameter is smaller than the diameter of the upper pin shaft and the lower pin shaft, and its length is 120% of the length of the upper pin shaft and the lower pin shaft, the handle is in the shape of a long rod, its axis is perpendicular to the axis of the push rod, and one end of the handle is connected to 80% of the length of the push rod.

[0031] In the above-mentioned method for replacing the step-type cooling bed lifting hydraulic cylinder, the lower safety pin and the upper safety pin are made of round steel, the diameter of which is smaller than the diameter of the upper pin and the lower pin, and the length is times the length of the upper pin and the lower pin.

[0032] In the above-mentioned method for replacing the stepping cooling bed lifting hydraulic cylinder, contact plates are provided at both ends of the top bar, and the contact plates are made of round steel plates.

[0033] In the above-mentioned method for replacing the step cooling bed lifting hydraulic cylinder, the connecting piece is made of round steel or threaded steel.

[0034] The present invention uses the ingenious cooperation of the hand chain hoist, the hydraulic jack and the safety pin shaft to accurately adjust the position of the lifting hydraulic cylinder and the longitudinal beam, eliminate the acting force between the longitudinal beam and the lifting hydraulic cylinder, and align the bearing holes of the front and rear ears of the lifting hydraulic cylinder with the pin shaft holes on the support. This can not only improve the equipment maintenance efficiency, but also eliminate the potential safety hazards and ensure the safety of equipment and personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0036] Figure 1 — Figure 3 These are the three states during the removal of the cooling bed lifting hydraulic cylinder;

[0037] Figure 4 — Figure 6 These are the three states during the installation of the cooling bed lifting hydraulic cylinder;

[0038] Figure 7 It is a schematic diagram of the structure of the tiger being beaten.

[0039] The numbers in the figure are as follows: 1. Push bar, 2. Hand hoist, 3. Upper wire rope, 4. Baffle, 5. Upper support of hydraulic cylinder, 6. Hydraulic jack, 7. Lower support of hydraulic cylinder, 8. Lower wire rope, 9. Lower safety pin, 10. Upper safety pin, 11. Longitudinal beam, 12. Lifting hydraulic cylinder, 13. Upper pin, 14. Lower pin, 15. Connector; 16. Push rod; 17. Handle. DETAILED DESCRIPTION

[0040] The present invention aims at the drawbacks of the prior art and provides a safe and efficient method for replacing the lifting hydraulic cylinder of a step-type cooling bed, so as to improve the equipment maintenance efficiency and ensure the safety of equipment and personnel.

[0041] In the implementation process of the present invention, tools such as a top bar 1, a hand chain hoist 2, an upper wire rope 3, a baffle 4, a hydraulic jack 6, a lower wire rope 8, a lower safety pin 9, an upper safety pin 10, and a beating tiger are required. The present invention includes the following steps:

[0042] Step 1: Preparation before removing the cooling bed lifting hydraulic cylinder

[0043] 1. Stop the step-by-step cooling bed, stop the pump in the hydraulic station, release the pressure and close the valve leading to the lifting hydraulic cylinder. Remove the high-pressure oil pipe connected to the step-by-step cooling bed.

[0044] 2. Weld the baffle 4 on the upper part of the longitudinal beam 11, bolt one end of the upper wire rope 3 to the longitudinal beam 11 and pass around the baffle 4, hang the hand winch 2 on the other end of the upper wire rope 3, bolt the lower wire rope 8 to the middle of the lifting hydraulic cylinder 12, lock it, and connect the lower wire rope 8 to the hook of the hand winch 2, place the hydraulic jack 6 and the push rod 1 on the left side of the lifting hydraulic cylinder 12 and directly below the longitudinal beam 11, put the push rod 1 on the hydraulic jack 6 and directly below the longitudinal beam 11, lock the hydraulic jack 6, and use a pressure rod to press the hydraulic jack 6 so that the hydraulic jack 6 and the push rod 1 can hold the longitudinal beam 11 tight.

[0045] 3. Weld the connecting piece 15 between the upper front ear and the cylinder barrel of the lifting hydraulic cylinder 12.

[0046] 4. Remove the accessories of the upper pin 13 and the lower pin 14 of the lifting hydraulic cylinder 12, and remove the pin clamping plate.

[0047] Step 2: Remove the lifting hydraulic cylinder:

[0048] The order is to first remove the pin 13, then remove the pin 14, and finally lift the lifting hydraulic cylinder 12 out.

[0049] 1. Operate the hydraulic jack 6 to make the top bar 1 lift up the longitudinal beam 11, so that the upper pin 13 does not bear the pressure from the longitudinal beam 11;

[0050] 2. Remove the upper pin 13:

[0051] There are two methods for removing the upper pin 13, which are performed in order.

[0052] The first sledgehammer method

[0053] Use a sledgehammer to strike the upper pin 13 with a hammer. If the upper pin 13 is loose and moves slowly, use lubricating oil to lubricate the upper pin 13 or use loosening fluid to remove rust to speed up the removal of the upper pin 13. If the upper pin 13 is struck several times without movement, the second method should be used.

[0054] The second method of destruction and demolition

[0055] The premise of this method is that the first method is ineffective and there are spare parts for the lifting hydraulic upper pin shaft 13. Use the oxygen hose connected to the oxygen pipeline to connect a thin oxygen tube (usually a steel pipe with an outer diameter of 10mm), and burn a through hole with a diameter smaller than the diameter of the upper pin shaft from the center of one end face of the upper pin shaft 13. At this time, the upper pin shaft 13 becomes a "pipe". Use the thin oxygen tube to burn off the upper left quarter of the "pipe". Use a sledgehammer and a tiger to knock the upper pin shaft 13 until only three quarters of the "pipe" remain, and complete the removal of the upper pin shaft 13.

[0056] 3. After removing the upper pin shaft 13, loosen the hand chain hoist 2 to make the upper front ear of the lifting hydraulic cylinder 12 leave the hydraulic cylinder upper support 5 and tilt at a certain angle.

[0057] 4. Remove the lower pin 14. Use the two methods to remove the upper pin 13 to remove the pin 14. After the lower pin 14 is removed from the lower support 7 of the hydraulic cylinder, quickly insert the lower safety pin 9 into the pin hole of the lower support 7 of the hydraulic cylinder;

[0058] 5. Re-tie the wire rope to the middle of the original lifting hydraulic cylinder 12, lock it and lift it out with the help of the overhead crane.

[0059] Step 3: Pre-install the new cooling bed lifting hydraulic cylinder

[0060] 1. Tie the middle part of the new cooling bed lifting hydraulic cylinder 12 with a wire rope, lock it and cooperate with the overhead crane, put the lower rear ear of the new cooling bed lifting hydraulic cylinder 12 into the lower support 7 of the hydraulic cylinder, and quickly insert the lower safety pin 9 into the pin hole of the lower support 7 of the hydraulic cylinder.

[0061] 2. Use the lower wire rope 8 to fasten the cooling bed lifting hydraulic cylinder 12 and connect it to the hook head of the hand chain hoist 2. Tighten the hand chain hoist 2 to unhook the overhead crane. By tightening the hand chain hoist 2, the upper front ear of the cooling bed lifting hydraulic cylinder 12 enters the upper support 5 of the hydraulic cylinder, and quickly insert the upper safety pin 10 into the pin hole of the upper support 5 of the hydraulic cylinder.

[0062] Step 4: Install the upper and lower pins of the lifting hydraulic cylinder

[0063] The order is to install the upper pin 13 of the lifting hydraulic cylinder 12 first, and then install the lower pin 14:

[0064] 1. Arrange personnel to hold the top bar 1 steady, loosen the oil drain valve of the hydraulic jack 6 by hand, lower the longitudinal beam 11 and the top bar 1 together, and then tighten the oil drain valve of the hydraulic jack 6 by hand, arrange personnel to use a pressure rod to press the hydraulic jack 6, observe the alignment of the pin shaft hole of the upper support 5 of the hydraulic cylinder and the upper front ear bearing hole of the lifting hydraulic cylinder 12, use the hand chain hoist 2 to control the left and right movement of the upper front ear bearing hole of the lifting hydraulic cylinder 12, and use the hydraulic jack 6 to control the longitudinal beam 11 and the upper support 5 of the hydraulic cylinder to move up and down. After the pin shaft hole of the upper support 5 of the hydraulic cylinder is aligned with the upper front ear bearing hole of the lifting hydraulic cylinder 12, remove the upper safety pin shaft 10 and install the upper pin shaft 13. Similarly, use the hydraulic jack 6 and the hand chain hoist 2 to control the alignment of the pin shaft hole of the lower support 7 of the hydraulic cylinder and the rear ear bearing hole of the lifting hydraulic cylinder 12. When the holes on both sides are aligned, remove the lower safety pin shaft 9 and install the upper and lower pin shafts 14.

[0065] When using a chain block 2 to control the left and right movement of the front ear bearing hole at the upper part of the lifting hydraulic cylinder 12, the height of the front ear bearing hole changes simultaneously. Therefore, it is necessary to first adjust the left and right positions of the front ear bearing hole, and then adjust the up and down positions of the pin shaft hole of the upper support of the hydraulic cylinder through a hydraulic jack. In this way, it only needs to be adjusted once to align the pin shaft hole of the upper support 5 of the hydraulic cylinder with the front ear bearing hole at the upper part of the lifting hydraulic cylinder 12, thus saving the adjustment time and improving the equipment maintenance efficiency.

[0066] 2. Install the accessories of the upper pin shaft 13 and the lower pin shaft 14, and install the pin shaft clamping plate. Install the high-pressure oil pipe connected to the walking cooling bed, and open the valve leading to the lifting hydraulic cylinder that is closed to complete the replacement of the lifting hydraulic cylinder.

[0067] After the replacement of the lifting hydraulic cylinder is completed, the production department and the maintenance department confirm that there is no error, start the pump, and the on-site operator operates the test run. After confirming that it is qualified, it is delivered to the production workshop for use.

[0068] The tools involved are as follows:

[0069] The beating tiger is composed of a push rod 16 and a handle 17 that are perpendicularly connected. The push rod 16 is generally made of round steel with a diameter of 40 mm or 50 mm and a length of 120% of the pin shaft length of the lifting hydraulic cylinder; the handle 17 is made of a 1-meter-long seamless steel pipe with a diameter of 20 mm. One end of the handle 17 is welded at 80% of the length of the push rod 16 to form a "T" shape.

[0070] The lower safety pin 9 or the upper safety pin 10 is generally made of round steel with a diameter of 40 mm or 50 mm and a length that is 2 times the actual length of the upper pin shaft 13 or the lower pin shaft 14, which is convenient for extraction from the pin hole.

[0071] The top bar 1 is made of a thick-walled steel pipe with a thickness of 60 mm - 80 mm, and two round steel plates are welded at both ends.

[0072] The connecting piece 15 is generally made of round steel or threaded steel with a diameter of 20 mm - 30 mm, and the length only needs to be able to connect to the front ear and the cylinder barrel.

[0073] The diameter of the upper pin shaft 13 or the lower pin shaft 14 of the lifting hydraulic cylinder 12 is generally between 100 mm and 150 mm.

[0074] The diameter of the through hole burned out on the end face of the upper pin shaft 13 or the lower pin shaft 14 of the lifting hydraulic cylinder 12 with an oxygen pipe is generally 60% - 80% of the diameter of the upper pin shaft 13 or the lower pin shaft 14.

Claims

1. A method for replacing a hydraulic cylinder for lifting a stepping cooling bed, characterized in that: The tools used in the method include a baffle (4), an upper steel wire rope (3), a hand chain hoist (2), a lower steel wire rope (8), a top bar (1), a hydraulic jack (6), a connecting piece (15), a lower safety pin (9) and an upper safety pin (10). The steps for replacing the lifting hydraulic cylinder are as follows: A. Preparation before removing the lifting hydraulic cylinder: ① Stop the step-by-step cooling bed, stop the pump and release the pressure at the hydraulic station, close the valve leading to the lifting hydraulic cylinder, and remove the high-pressure oil pipe connected to the step-by-step cooling bed; ② Weld a baffle (4) on the upper part of the longitudinal beam (11) and make the baffle (4) be located obliquely above the lifting hydraulic cylinder (12), the upper end of the upper wire rope (3) is bolted to the longitudinal beam (11) and clamped to the baffle (4), the lower end is hung with a hand chain hoist (2), the lower wire rope (8) is bolted to the middle part of the lifting hydraulic cylinder (12) and connected to the hook of the hand chain hoist (2), the hydraulic jack (6) is placed just below the longitudinal beam (11), the lower end of the jack (1) is placed on the hydraulic jack (6), and the upper end is pressed against the lower surface of the longitudinal beam (11); ③ Welding a connecting piece (15) between the upper front ear and the cylinder barrel of the lifting hydraulic cylinder (12); ④ Remove the attachments of the upper pin shaft (13) and the lower pin shaft (14) of the lifting hydraulic cylinder (12); B. Remove the lifting hydraulic cylinder: ① Operate the hydraulic jack (6) to make the jacking bar (1) lift up the longitudinal beam (11) until the upper pin (13) is no longer subject to pressure from the longitudinal beam (11); ② Remove the upper pin (13); ③ Release the hand chain hoist (2) to tilt the lifting hydraulic cylinder (12) to a certain angle, so that the front ear of the lifting hydraulic cylinder (12) leaves the hydraulic cylinder upper support (5); ④ Remove the lower pin (14). After the lower pin (14) is removed from the lower support (7) of the hydraulic cylinder, insert the lower safety pin (9) into the pin hole of the lower support (7) of the hydraulic cylinder. ⑤ Use an overhead crane to lift out the lifting hydraulic cylinder (12); C. Pre-install new lifting hydraulic cylinder ① Use an overhead crane to lift the new lifting hydraulic cylinder (12), place the lower rear ear of the new lifting hydraulic cylinder (12) into the lower support (7) of the hydraulic cylinder, and insert the lower safety pin (9) into the pin hole of the lower support (7) of the hydraulic cylinder; ② Bolt the lower wire rope (8) to the middle of the new lifting hydraulic cylinder (12) and connect it to the hook of the hand chain hoist (2), tighten the hand chain hoist (2), let the overhead crane unhook, and then tighten the hand chain hoist (2) to make the front ear of the lifting hydraulic cylinder (12) enter the hydraulic cylinder upper support (5), and insert the upper safety pin (10) into the pin hole of the hydraulic cylinder upper support (5); D. Install the upper and lower pins of the lifting hydraulic cylinder ① Install the upper pin of the lifting hydraulic cylinder: first, adjust the left and right position of the front ear bearing hole of the lifting hydraulic cylinder (12) by the hand chain hoist (2) so that it is located directly below the pin hole of the hydraulic cylinder upper support (5), and then adjust the up and down position of the pin hole of the hydraulic cylinder upper support (5) by the hydraulic jack (6). When the front ear bearing hole of the lifting hydraulic cylinder (12) is aligned with the pin hole of the hydraulic cylinder upper support (5), replace the upper safety pin (10) with the upper pin (13); ② Install the lower pin of the lifting hydraulic cylinder: adjust the left and right position of the rear ear bearing hole of the lifting hydraulic cylinder (12) by the hand chain hoist (2) so that it is located directly above the pin hole of the hydraulic cylinder lower support (7), and then adjust the up and down position of the rear ear bearing hole of the lifting hydraulic cylinder (12) by the hydraulic jack (6). When the rear ear bearing hole of the lifting hydraulic cylinder (12) is aligned with the pin hole of the hydraulic cylinder lower support (7), replace the lower safety pin (9) with the lower pin (14); ③ Install the accessories of the upper pin (13) and the lower pin (14), install the high-pressure oil pipe connected to the step-type cooling bed, open the valve leading to the lifting hydraulic cylinder, and complete the replacement of the lifting hydraulic cylinder.

2. The method for replacing a stepping cooling bed lifting hydraulic cylinder according to claim 1 is characterized in that: Methods for removing the upper pin shaft (13) and the lower pin shaft (14) include a sledgehammer knocking method and a destructive demolition method. When removing, the sledgehammer knocking method is first used. If the sledgehammer knocking method cannot loosen the upper pin shaft (13) or the lower pin shaft (14), the destructive demolition method is used. The tiger-beating device comprises a push rod (16) and a handle (17), wherein the push rod (16) is made of round steel, and its diameter is smaller than the diameter of the upper pin shaft (13) and the lower pin shaft (14), and its length is 120% of the length of the upper pin shaft (13) and the lower pin shaft (14), and the handle (17) is in the shape of a long rod, and its axis is perpendicular to the axis of the push rod (16), and one end of the handle (17) is connected to 80% of the length of the push rod (16); The sledgehammer striking method is: Use a sledgehammer to hit the upper pin shaft (13) or the lower pin shaft (14) with a hammer. If the upper pin shaft (13) or the lower pin shaft (14) is loose but the moving speed is less than the set value, apply lubricating oil or use loosening fluid to remove rust on the upper pin shaft (13) or the lower pin shaft (14) to increase the disassembly speed; The destructive demolition method is: Using an oxyacetylene flame, a through hole having a diameter smaller than that of the upper pin (13) or the lower pin (14) is burned out along its axis from the center of the end face of one end of the upper pin (13) or the lower pin (14), so that the upper pin (13) or the lower pin (14) becomes a "tube". Then, using an oxyacetylene flame, a quarter of the circumference of the "tube" is burned off. Finally, a sledgehammer is used to hit the remaining "tube" with a C-shaped cross section until it is removed.

3. The method for replacing a hydraulic cylinder for lifting a stepping cooling bed according to claim 2 is characterized in that: When the upper pin (13) or the lower pin (14) is removed by the destructive removal method, the diameter of the through hole burned on the upper pin (13) or the lower pin (14) is 60%-80% of the diameter of the upper pin (13) or the lower pin (14).

4. A method for replacing a stepping cooling bed lifting hydraulic cylinder according to any one of claims 1 to 3, characterized in that: The lower safety pin (9) and the upper safety pin (10) are made of round steel, have a diameter smaller than that of the upper pin (13) and the lower pin (14), and a length twice that of the upper pin (13) and the lower pin (14).

5. The method for replacing a stepping cooling bed lifting hydraulic cylinder according to claim 4 is characterized in that: Both ends of the top bar (1) are provided with contact plates, and the contact plates are made of round steel plates.

6. A method for replacing a stepping cooling bed lifting hydraulic cylinder according to claim 5, characterized in that: The connecting piece (15) is made of round steel or threaded steel.

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