A large-sized converter installation device and installation method

Abstract

This invention discloses a large converter installation device and method, belonging to the field of converter installation technology. The device includes a support mechanism and a moving mechanism, with the moving mechanism connected to an alignment mechanism. The support mechanism includes a support frame and a support ring fitted onto the middle of the converter, with the support ring located on the support frame. A bearing seat is connected to the side of the support ring, and a base is provided below the bearing seat. The support frame is connected to the moving mechanism. The moving mechanism moves the converter to an installation position corresponding to the base. The alignment mechanism fine-tunes the position of the moving mechanism to achieve precise positioning between the bearing seat and the base. This invention adjusts the position of the rail-guided trolley on the first guide rail through the alignment mechanism, thereby enabling rapid connection between the bolt holes at the bottom of the bearing seat on the support ring and the bolts on the base. This improves the construction efficiency of large converter installation and solves the problem of converter installation in confined spaces.

Description

Technical Field

[0001] This invention relates to the field of converter installation technology, and more specifically, to a large converter installation device and installation method. Background Technology

[0002] Converter equipment is a core process equipment in steelmaking engineering. Due to the heavy weight and large size of the furnace shell and support ring, and the constraint of the plant structure on the converter's installation location, installation is difficult. Currently, large converters are usually installed using a relatively mature assembly method. The most crucial aspects are the smooth lowering and positioning of the converter after it is moved into place, as well as the fine-tuning during the process.

[0003] The heavy weight of the converter and supporting rings exerts significant pressure on the laid tracks, making them prone to shifting. Furthermore, the center of gravity of the converter and supporting rings may deviate from the center of gravity of the trolley, causing lateral displacement of the trolley as it moves along the tracks. Consequently, during converter installation, there is a misalignment between the bolt holes at the bottom of the bearing housings on the supporting rings and the bolts on the base. This necessitates extensive manual intervention during construction, resulting in low efficiency and significant risks.

[0004] Patent CN201610236796.X discloses an installation method for an ultra-large converter assembly, which includes the following steps: S1, construction preparation; S2, hoisting and installation of bearing seat base and torsion bar base; S3, assembly of bearing seat and support ring; S4, hoisting of furnace bottom; S5, hoisting of support ring assembly; S6, hoisting of upper furnace shell; S7, assembly, positioning and welding of furnace bottom and furnace body;

[0005] S8. Assembly and hoisting of the tilting mechanism; S9. Installation using a combination method. This invention eliminates the need for large cranes, reducing costs and high-altitude operations. The combination method of trolley and emergency beam installation lowers safety risks. However, this patented solution still does not solve the problem of low installation accuracy of large converters in confined spaces, leading to low construction efficiency.

[0006] In summary, improving construction efficiency is a current challenge for the installation of large converters in confined spaces. Summary of the Invention

[0007] 1. The technical problem that the invention aims to solve

[0008] The purpose of this invention is to overcome the problem of low installation efficiency of large converters in the prior art, and to provide a large converter installation device and method. This solution uses an installation device to quickly connect the bolt holes at the bottom of the bearing seat to the bolts on the base, improving the construction efficiency of large converter installation and solving the problem of installing large converters in confined spaces.

[0009] 2. Technical Solution

[0010] To achieve the above objectives, the technical solution provided by the present invention is as follows:

[0011] The present invention provides a large converter installation device, comprising a support mechanism and a moving mechanism, wherein the moving mechanism is connected to an alignment mechanism;

[0012] The support mechanism includes a support frame and a support ring fitted in the middle of the converter, the support ring being located on the support frame; a bearing seat is connected to the side of the support ring, a base is provided below the bearing seat, and the support frame is connected to the moving mechanism;

[0013] The moving mechanism drives the converter to the installation position corresponding to the base, and the alignment mechanism fine-tunes the position of the moving mechanism to achieve precise positioning between the bearing seat and the base.

[0014] Furthermore, the moving mechanism includes a rail trolley and a first guide rail, the rail trolley being slidably mounted on the first guide rail, and the support frame being connected to the rail trolley.

[0015] Furthermore, the alignment mechanism includes a movable support and a drive assembly; the movable support includes a connecting part, and hooking parts are respectively connected to both ends of the connecting part, the hooking parts hooking into the inner side of the first guide rail; one end of the drive assembly is connected to the movable support, and the other end is fixed to the wheel of the rail trolley.

[0016] Furthermore, it includes an adjustable clamping assembly disposed on the connecting portion, the adjustable clamping assembly being used to clamp the driving assembly.

[0017] Furthermore, the drive assembly includes a push-pull hydraulic cylinder, a ball bearing clamp, and a push plate; the cylinder body of the push-pull hydraulic cylinder is fixed to the adjustable clamping assembly; the ball bearing clamp is disposed on the piston rod of the push-pull hydraulic cylinder, the front end of the ball bearing clamp is connected to the push plate, and the push plate is fixedly connected to the wheel of the rail trolley.

[0018] Furthermore, the ball clamp includes a clamping bushing, a steel ball, and a progressive bolt; the clamping bushing is sleeved on the piston rod, the clamping bushing is threadedly connected to the progressive bolt, the clamping bushing has a round hole for accommodating the steel ball; the bottom of the progressive bolt has a bevel for abutting the steel ball.

[0019] Furthermore, the adjustable clamping assembly includes a second guide rail and a movable clamping member slidably mounted on the second guide rail; the second guide rail is fixedly disposed on the connecting part, and the movable clamping member is used to fix the cylinder body of the push-pull hydraulic cylinder.

[0020] Furthermore, the movable clamping component includes a movable block and a clamping block; the movable block has a hollow groove, and the movable block is sleeved on the second guide rail through the hollow groove; the clamping block has a V-shaped structure, and the V-shaped openings of the two clamping blocks are arranged opposite each other, and the opening ends are detachably connected.

[0021] Furthermore, the support frame includes several steel columns, with a steel platform at the top of each column. A lifting assembly is mounted on the steel platform, and the lifting assembly includes a lifting hydraulic cylinder and a safety pad. The lifting hydraulic cylinders are interlocked and used to lift the support ring upwards.

[0022] A method for installing a large converter using any of the above-described devices according to the present invention includes the following steps:

[0023] S1. Place the support ring on the safety pad at the top of the steel column of the support frame, and place the converter inside the support ring;

[0024] S2. Start the rail-mounted trolley and move it to the converter installation position, so that the bearing seats on both sides of the support ring are respectively above the base.

[0025] S3. Control the lifting hydraulic cylinder to lift the support ring upwards. When the support ring separates from the safety pad, control the alignment mechanism to fine-tune the position of the moving mechanism to achieve precise matching between the bolt holes of the bearing seat and the bolts on the base.

[0026] S4. Remove the safety pad and control the lifting hydraulic cylinder to descend, so that the base of the bearing housing is precisely positioned on the base.

[0027] 3. Beneficial effects

[0028] Compared with the prior art, the technical solution provided by this invention has the following advantages:

[0029] (1) In this invention, all four wheels of the rail trolley are connected to an alignment mechanism. The hook part in the alignment mechanism is connected to the first guide rail. The alignment mechanism makes a fine adjustment to the position of the rail trolley on the first guide rail, thereby realizing the rapid connection between the bolt hole at the bottom of the bearing seat and the bolt on the base, which improves the construction efficiency of large converter installation and solves the problem of converter installation in a limited space.

[0030] (2) The alignment mechanism in this invention adopts an adjustable clamping assembly, which includes a second guide rail and two movable clamping parts. The two movable clamping parts are slidably disposed on the second guide rail, and a push-pull hydraulic cylinder is located between the two movable clamping parts. The two movable clamping parts are detachably connected. This adjustable clamping assembly can clamp different types of push-pull hydraulic cylinders, thereby improving the compatibility of the alignment mechanism.

[0031] (3) The alignment mechanism of this invention uses a ball bearing clamp, which is set on the piston rod of the push-pull hydraulic cylinder. The ball bearing clamp includes a clamping bushing, steel balls, a first progressive bolt and a second progressive bolt. The clamping bushing is set on the piston rod of the push-pull hydraulic cylinder. The two ends of the clamping bushing are provided with threads, and the middle part is provided with a round hole. The first progressive bolt and the second progressive bolt are respectively threaded to the threads at both ends of the clamping bushing. The steel balls are set in the round hole of the clamping bushing. The push plate is provided with a threaded round hole. The end of the clamping bushing is threaded to the push plate. This ball bearing clamp can fasten the piston rod of different models of push-pull hydraulic cylinders, which greatly improves the compatibility of the alignment mechanism. Attached Figure Description

[0032] Figure 1 A schematic diagram of the installation device for a large converter.

[0033] Figure 2 A schematic diagram of the alignment mechanism;

[0034] Figure 3 This is a schematic diagram of the adjustable clamping assembly.

[0035] Figure 4 This is a cross-sectional view of the ball bearing clamp;

[0036] Figure 5 This is a schematic diagram of the lifting assembly.

[0037] Figure 6 This is a schematic diagram showing the distribution of multiple alignment mechanisms.

[0038] Explanation of the labels in the diagram:

[0039] 1. Support mechanism; 101. Support ring; 102. Support frame; 1021. Safety pad; 1022. Lifting hydraulic cylinder; 1023. Steel platform; 1024. Steel column; 103. Bearing seat; 104. Base;

[0040] 2. Moving mechanism; 201. Rail trolley; 2011. Wheel; 202. First guide rail;

[0041] 3. Alignment mechanism; 301. Casters; 302. Moving bracket; 3021. Connecting part; 3022. Hooking part; 303. Second guide rail; 304. Movable clamping part; 3041. Movable block; 3042. Clamping block; 305. Push-pull hydraulic cylinder; 3051. Piston rod; 306. Ball bearing clamp; 3061. Pressing bushing; 3062. Steel ball; 3063. First progressive bolt; 3064. Second progressive bolt; 307. Push plate; 4. Converter. Detailed Implementation

[0042] To further understand the content of this invention, a detailed description of the invention will be provided in conjunction with the accompanying drawings and embodiments.

[0043] The structures, proportions, and sizes illustrated in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art in understanding and reading the invention. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and not intended to limit the scope of implementation. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0044] Example 1

[0045] like Figure 1 and Figure 5 As shown, a large converter installation device in this embodiment includes a support mechanism 1, a moving mechanism 2, and an alignment mechanism 3. The support mechanism 1 includes a support ring 101 and a support frame 102. The support ring 101 is fitted in the middle of the converter 4. Bearing seats 103 are provided on both sides of the support ring 101. The support ring 101 is set on the support frame 102, and the support frame 102 is set on the moving mechanism 2. The alignment mechanism 3 is connected to the moving mechanism 2. The moving mechanism 2 drives the converter 4 to move to the converter installation position corresponding to the base 104. The alignment mechanism 3 makes fine adjustments to the position of the moving mechanism 2 to achieve precise calibration of the bearing seats 103 and the base 104.

[0046] The mobile mechanism 2 includes a rail trolley 201 and a first guide rail 202. The support frame 102 is fixedly mounted on the rail trolley 201, and the rail trolley 201 is slidably mounted on the first guide rail 202. A lifting component is mounted on the support frame 102.

[0047] Specifically, the support frame 102 includes four steel columns 1024 arranged in a rectangular pattern. The bottom of each steel column 1024 is fixedly connected to the rail trolley 201, and a steel platform 1023 is provided on the top of each steel column 1024. A lifting component is provided on the steel platform 1023.

[0048] The lifting assembly includes a lifting hydraulic cylinder 1022 and a safety pad 1021. The four sets of lifting hydraulic cylinders 1022 are interlocked and can achieve simultaneous lifting and lowering.

[0049] Furthermore, such as Figure 6As shown, all four wheels 2011 of the rail trolley 201 are equipped with an alignment mechanism 3, which helps to quickly connect the bolt holes of the bearing housing 103 with the bolts on the base 104.

[0050] like Figure 2 and Figure 3 As shown, the alignment mechanism 3 includes casters 301, a movable bracket 302, and a drive assembly. The movable bracket 302 includes a connecting part 3021 and a hooking part 3022, which can be connected by a pin. The movable bracket 302 has an overall U-shaped structure. The hooking part 3022 hooks onto the inner side of the first guide rail 202. The casters 301 are located at the four ends of the bottom surface of the connecting part 3021, and the casters 301 and the connecting part 3021 can be connected by bolts.

[0051] like Figure 4 As shown, the drive assembly includes a push-pull hydraulic cylinder 305, a ball bearing clamp 306, and a push plate 307. The cylinder body of the push-pull hydraulic cylinder 305 is fixedly mounted on the connecting part 3021 of the movable bracket 302. The ball bearing clamp 306 is sleeved on the piston rod 3051. The ball bearing clamp 306 is connected to the push plate 307, and the push plate 307 is fixedly connected to the wheel 2011 of the rail trolley 201.

[0052] Specifically, the ball clamp 306 includes a clamping bushing 3061, a steel ball 3062, a first progressive bolt 3063, and a second progressive bolt 3064. The clamping bushing 3061 has threads machined at both ends and two rows of circular holes machined in the middle. The clamping bushing 3061 is fitted onto the piston rod 3051 of the push-pull hydraulic cylinder 305. The first progressive bolt 3063 and the second progressive bolt 3064 are threadedly connected to the threads at both ends of the clamping bushing 3061. The steel ball 3062 is disposed within the circular hole in the middle of the clamping bushing 3061.

[0053] By rotating the first progressive bolt 3063 and the second progressive bolt 3064 toward the center of the clamping bushing 3061, the first progressive bolt 3063 and the second progressive bolt 3064 respectively squeeze the steel ball 3062. This ball clamp 306 can fasten the piston rod 3051 of different types of push-pull hydraulic cylinders 305.

[0054] Since the inner diameter of the clamping bushing 3061 is larger than the diameter of the piston rod 3051, and the outer surface hole diameter of the round hole on the clamping bushing 3061 is larger than the inner surface hole diameter, the inner sides of the first progressive bolt 3063 and the second progressive bolt 3064 are provided with bevels. When the first progressive bolt 3063 and the second progressive bolt 3064 are rotated, their bevels squeeze the steel ball 3062.

[0055] The smaller the diameter of the piston rod 3051, the deeper the steel ball 3062 penetrates into the clamping sleeve 3061; conversely, the deeper the penetration, the shallower the penetration. This structure serves two purposes: firstly, the contact between the steel ball 3062 and the piston rod 3051 fixes the push plate 307 to the piston rod 3051 of the push-pull hydraulic cylinder 305; secondly, the ball clamp 306 offers good compatibility, accommodating hydraulic cylinders with similar thrust but different models.

[0056] like Figure 2 As shown, the push plate 307 can adopt a square structure. The center of the push plate 307 is provided with a round hole with internal threads. The push plate 307 is threadedly connected to the external thread at the end of the clamping bushing 3061. The push plate 307 is fixedly connected to the wheel 2011 of the rail trolley 201.

[0057] In this embodiment, the position of the rail trolley 201 on the first guide rail 202 is adjusted by setting the alignment mechanism 3, thereby realizing the rapid connection between the bolt holes at the bottom of the bearing seat 103 and the bolts on the base 104, which improves the construction efficiency of large converter installation and effectively solves the problem of large converter installation in limited space.

[0058] Example 2

[0059] To accommodate converters 4 of different weights, different models of push-pull hydraulic cylinders 305 are required. Therefore, compared with embodiment 1, the alignment mechanism 3 in this embodiment uses an adjustable clamping component, which can clamp the cylinder body of different models of push-pull hydraulic cylinders 305, and has strong compatibility.

[0060] like Figure 3 As shown, the adjustable clamping assembly is fastened to the cylinder body of the push-pull hydraulic cylinder 305. The adjustable clamping assembly includes a second guide rail 303 and two movable clamping parts 304. The second guide rail 303 is fixedly installed on the inner wall of the connecting part 3021 of the movable bracket 302. The two movable clamping parts 304 are slidably installed on the second guide rail 303 respectively. The push-pull hydraulic cylinder 305 is located between the two movable clamping parts 304. The two movable clamping parts 304 are detachably connected.

[0061] Each movable clamping member 304 includes a movable block 3041 and a clamping block 3042 that are integrated together. The movable block 3041 has a hollow groove for passing through the second guide rail 303. The movable block 3041 is slidably disposed on the second guide rail 303 through the hollow groove, thereby adjusting the distance between the two movable clamping members 304.

[0062] Preferably, the clamping block 3042 can adopt a V-shaped structure, with the V-shaped openings of the clamping blocks 3042 of the two movable clamping members 304 arranged opposite to each other for clamping the cylinder body of the push-pull hydraulic cylinder 305, and the opening ends of the two clamping blocks 3042 are locked together.

[0063] Specifically, the second guide rail 303 is fastened to the connecting part 3021 of the movable bracket 302 by bolts. The movable blocks 3041 of the two movable clamping members 304 are all machined with dovetail grooves, and the movable blocks 3041 are in contact with the second guide rail 303 through the dovetail grooves. The open ends of the clamping blocks 3042 of the two movable clamping members 304 are fastened together by bolts.

[0064] The distance between the two movable clamping members 304 is adjusted by moving the movable block 3041 of the two movable clamping members 304 on the second guide rail 303. This distance adjustment fastening assembly can fasten the cylinder body part of different models of push-pull hydraulic cylinders 305.

[0065] Example 3

[0066] This embodiment provides a method for installing a large converter using the above-described device, specifically including the following steps:

[0067] S1. Assemble the large converter installation device of the above embodiment, place the support ring 101 on the safety pad 1021 of the steel platform 1023, and provide bearing seats 103 on both sides of the support ring 101. Then place the converter 4 in the support ring 101, and set the support frame 102 on the rail trolley 201.

[0068] S2. Slowly start the rail trolley 201. The rail trolley 201 drives the support frame 102, the support ring 101, the converter 4 and the bearing seat 103 to move along the length of the first guide rail 202 to the converter installation position corresponding to the base 104. The rail trolley 201 stops working. At this time, the bearing seats 103 on both sides are located above the base 104 respectively.

[0069] S3. Control the four sets of lifting hydraulic cylinders 1022 to lift them up simultaneously, lifting the support ring 101 upwards. When the support ring 101 separates from the safety pad 1021, the position of the moving mechanism 2 is finely adjusted by controlling the alignment mechanism 3, so as to achieve precise matching between the bolt holes of the bearing seat 103 and the bolts on the base 104.

[0070] Specifically, such as Figure 6 As shown, each of the four wheels 2011 of the rail trolley 201 is equipped with a corresponding alignment mechanism 3, and the hooking part 3022 of the alignment mechanism 3 hooks into the inner side of the first guide rail 202.

[0071] By controlling the piston rod 3051 of the push-pull hydraulic cylinder 305 in the four sets of alignment mechanisms 3 to extend and retract, the force of the push-pull hydraulic cylinder 305 is applied to the wheel 2011 of the rail trolley 201 by the push plate 307, so as to realize the positional offset and small-angle rotation of the rail trolley 201 in the left and right directions on the first guide rail 202.

[0072] S4. When the bolt holes at the bottom of the bearing housing 103 are precisely aligned with the bolt positions at the top of the base 104, the safety pad 1021 is pulled out and the four sets of lifting hydraulic cylinders 1022 are controlled to descend simultaneously to position the support ring 101 and the converter 4 on the base 104.

[0073] This invention adjusts the posture of the rail-mounted trolley 201 through the alignment mechanism 3, enabling the bolt holes at the bottom of the bearing seat 103 to quickly connect with the bolts at the top of the base 104, thus improving the construction efficiency of large converter installation and solving the problem of converter installation in confined spaces. Simultaneously, the adjustable clamping assembly used in the alignment mechanism 3 can clamp different models of push-pull hydraulic cylinders 305, and the ball bearing clamp 306 used in the alignment mechanism 3 can clamp the piston rods 3051 of different models of push-pull hydraulic cylinders 305, greatly improving the compatibility of the alignment mechanism 3.

[0074] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited to this. To avoid repetition, repeated content in each embodiment has been omitted, but this should not be construed as meaning that the corresponding embodiment does not include features from other embodiments. Features that cooperate with each other in different embodiments can also be combined with each other. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A large converter installation device, characterized in that, It includes a support mechanism (1) and a moving mechanism (2), wherein the moving mechanism (2) is connected to an alignment mechanism (3); The support mechanism (1) includes a support frame (102) and a support ring (101) fitted in the middle of the converter (4). The support ring (101) is located on the support frame (102). A bearing seat (103) is connected to the side of the support ring (101). A base (104) is provided below the bearing seat (103). The support frame (102) is connected to the moving mechanism (2). The moving mechanism (2) drives the converter (4) to move to the installation position corresponding to the base (104), and the alignment mechanism (3) finely adjusts the position of the moving mechanism (2) to achieve precise positioning between the bearing seat (103) and the base (104); The moving mechanism (2) includes a rail trolley (201) and a first guide rail (202). The rail trolley (201) is slidably disposed on the first guide rail (202), and the support frame (102) is connected to the rail trolley (201). The alignment mechanism (3) includes a movable support (302) and a drive assembly; the movable support (302) includes a connecting part (3021), and hooking parts (3022) are respectively connected to both ends of the connecting part (3021), and the hooking parts (3022) hook into the inner side of the first guide rail (202); one end of the drive assembly is connected to the movable support (302), and the other end is fixed to the wheel (2011) of the rail trolley (201); It also includes a distance adjustment fastening assembly disposed on the connecting part (3021), the distance adjustment fastening assembly being used to clamp the driving assembly; The drive assembly includes a push-pull hydraulic cylinder (305), a ball clamp (306), and a push plate (307); the cylinder body of the push-pull hydraulic cylinder (305) is fixed to the adjustable clamping assembly; the ball clamp (306) is disposed on the piston rod (3051) of the push-pull hydraulic cylinder (305), the front end of the ball clamp (306) is connected to the push plate (307), and the push plate (307) is fixedly connected to the wheel (2011) of the rail trolley (201).

2. The large converter installation device according to claim 1, characterized in that, The ball clamp (306) includes a clamping bushing (3061), a steel ball (3062), and a progressive bolt; the clamping bushing (3061) is sleeved on the piston rod (3051), the clamping bushing (3061) is threadedly connected to the progressive bolt, the clamping bushing (3061) is provided with a round hole for accommodating the steel ball (3062); the bottom of the progressive bolt is provided with a bevel, the bevel is used to abut against the steel ball (3062).

3. The large converter installation device according to claim 1, characterized in that, The adjustable clamping assembly includes a second guide rail (303) and a movable clamping member (304) slidably mounted on the second guide rail (303); the second guide rail (303) is fixedly mounted on the connecting part (3021), and the movable clamping member (304) is used to fix the cylinder body of the push-pull hydraulic cylinder (305).

4. A large converter installation device according to claim 3, characterized in that, The movable clamping component (304) includes a movable block (3041) and a clamping block (3042); the movable block (3041) has a hollow groove, and the movable block (3041) is sleeved on the second guide rail (303) through the hollow groove; the clamping block (3042) has a V-shaped structure, and the V-shaped openings of the two clamping blocks (3042) are arranged opposite to each other, and the opening ends are detachably connected.

5. A large converter installation device according to any one of claims 1-4, characterized in that, The support frame (102) includes several steel columns (1024), and a steel platform (1023) is provided at the top of the steel columns (1024). A lifting assembly is provided on the steel platform (1023). The lifting assembly includes a lifting hydraulic cylinder (1022) and a safety pad (1021). The several lifting hydraulic cylinders (1022) are interlocked and used to lift the support ring (101) upward.

6. A method for installing a large converter using the large converter installation device according to any one of claims 1-5, characterized in that, Includes the following steps: S1. Place the support ring (101) on the safety pad (1021) at the top of the steel column (1024) of the support frame (102), and place the converter (4) inside the support ring (101); S2. Start the rail trolley (201) and move it to the installation position of the converter (4) so ​​that the bearing seats (103) on both sides of the support ring (101) are respectively above the base (104); S3. Control the lifting hydraulic cylinder (1022) to lift up the support ring (101) upward. When the support ring (101) separates from the safety pad (1021), control the alignment mechanism (3) to finely adjust the position of the moving mechanism (2) to achieve precise matching between the bolt hole of the bearing seat (103) and the bolt on the base (104). S4. Remove the safety pad (1021) and control the lifting hydraulic cylinder (1022) to descend so that the base of the bearing seat (103) is precisely positioned on the base (104).

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