A low-pressure cylinder chain-type lifting adjustment device and method

Abstract

The present invention belongs to the technical field of mechanical design, and specifically relates to a low-pressure cylinder chain-type lifting and adjusting device and method. The present invention includes an upper unloading clasp, an upper adjustment sleeve, an upper connecting block, a lower connecting block, a lower adjustment sleeve, a lower unloading clasp, a connecting web I, and a connecting web II. The lower end of the upper unloading clasp is connected to the upper end of the upper adjustment sleeve, and the lower end of the upper adjustment sleeve is connected to the upper end of the upper connecting block; the connecting web I and the connecting web II connect the lower end of the upper connecting block to the upper end of the lower connecting block; the lower end of the lower connecting block is connected to the upper end of the lower adjusting sleeve; the lower end of the lower adjusting sleeve is connected to the upper end of the lower unloading clasp. The present invention is used to solve the difficulty of lifting a low-pressure outer cylinder, reduce the safety risk of lifting large pieces such as a low-pressure outer cylinder, improve the success rate of lifting a low-pressure outer cylinder, reduce the lifting time, and improve the efficiency of overhaul.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical design, and in particular relates to a low-pressure cylinder chain-type lifting and adjusting device and method. Background Art

[0002] The steam turbine of a power station consists of four low-pressure cylinders and one high-pressure cylinder. The low-pressure cylinder is large in size and mass. During the maintenance process, the hoisting of the low-pressure outer cylinder is the most troublesome and difficult to level and adjust. The low-pressure cylinder has many matching positions with the inner cylinder and the partition, and the gap is small. If the low-pressure outer cylinder is not adjusted in place, it is difficult to hoist it out or install it in place. The special hoist provided by the manufacturer is a pair of steel wire ropes with an adjustment basket each. In order to prevent interference with the outer wall of the low-pressure cylinder, the upper hoisting point of the low-pressure cylinder is used. Due to the high position and weight offset of the adjustment device, it is necessary to stand on the top of the cylinder for adjustment during actual hoisting. The operation is difficult and was eventually abandoned; later, a pair of steel wire ropes without adjustment function were used, and the lower hoisting point of the low-pressure cylinder was used. Although it is easier to hook, the length of the steel wire rope itself is different, which makes it difficult to level the low-pressure outer cylinder during the hoisting process. In actual application, there have been many cases where it is difficult to hoist the cylinder out and to put it in place, causing great safety hazards.

[0003] Some units' steam turbines use wire ropes and chain hoists to lift the low-pressure outer cylinder during maintenance. Due to the heavy weight of the low-pressure cylinder, a chain hoist with a larger tonnage is selected. The adjustment of the chain hoist solves the problem of initial length consistency, but when the cylinder is opened, the lifting will exceed the rated lifting capacity of the chain hoist due to the jamming of the cylinder and the components inside the cylinder, creating a new safety hazard. Summary of the invention

[0004] The object of the present invention is to provide a chain-type lifting and adjusting device and method for a steam turbine low-pressure cylinder, which is used to solve the difficulty in lifting the low-pressure outer cylinder, reduce the safety risks of lifting large parts such as the low-pressure outer cylinder, increase the success rate of lifting the low-pressure outer cylinder, reduce the lifting time, and improve the overhaul efficiency.

[0005] The technical solution adopted by the present invention is:

[0006] A chain-type lifting and adjusting device for a low-pressure cylinder of a steam turbine comprises an upper unloading clasp, an upper adjusting sleeve, an upper connecting block, a lower connecting block, a lower adjusting sleeve, a lower unloading clasp, a connecting web I and a connecting web II. The upper adjusting sleeve and the lower adjusting sleeve are mutually symmetrical structures, the upper unloading clasp and the lower unloading clasp are mutually symmetrical structures, and the upper connecting block and the lower connecting block are mutually symmetrical structures; the lower end of the upper unloading clasp is connected to the upper end of the upper adjusting sleeve, and the lower end of the upper adjusting sleeve is connected to the upper end of the connecting block; the connecting web I and the connecting web II connect the lower end of the upper connecting block to the upper end of the lower connecting block; the lower end of the lower connecting block is connected to the upper end of the lower adjusting sleeve; the lower end of the lower adjusting sleeve is connected to the upper end of the lower unloading clasp.

[0007] The upper unloading cleat is of U-shaped structure, the lower end of the upper unloading cleat is screwed into the upper adjusting sleeve through a thread, the length of the thread is used to adjust the length of the sling, and the thread in the upper adjusting sleeve is a left-hand thread.

[0008] The lower part of the upper adjusting sleeve is provided with a groove, and the two walls of the groove are provided with through holes. The two ends of the upper connecting block are respectively provided with through holes. The through hole of the upper adjusting sleeve is connected with the upper through hole of the upper connecting block through a connecting pin shaft I. After the connection, the connecting pin shaft I is screwed onto the connecting pin shaft I nut, and the connecting pin shaft I cotter pin is used to prevent loosening.

[0009] The connecting webs I and II are provided with through holes at relative positions, and the lower through holes of the upper connecting block are connected to the connecting webs I and II through connecting pins II. After connection, the connecting pins II are screwed onto the connecting pins II nuts, and the connecting pins II cotter pins are used to prevent loosening.

[0010] The two ends of the lower connecting block are respectively provided with through holes, and the upper through hole is connected with the connecting web I and the connecting web II through the connecting pin III. After the connection, the connecting pin III is screwed onto the connecting pin III nut, and the connecting pin III cotter pin is used to prevent loosening.

[0011] The lower through hole of the lower connecting block is connected with the lower adjusting sleeve via a connecting pin IV. The connected connecting pin IV is screwed onto a connecting pin IV nut, and a connecting pin IV cotter pin is used to prevent loosening.

[0012] The lower unloading clasp is screwed into the lower adjusting sleeve through a thread, and the length of the thread is used to adjust the length of the sling, and the thread in the lower adjusting sleeve is a right-hand thread.

[0013] It also includes a lower rope loop and an upper rope loop, one end of the upper rope loop is connected to the upper unloading key through an upper unloading key pin shaft, the upper unloading key pin shaft after connection is screwed on the upper unloading key nut, and the upper unloading key cotter pin is used to prevent loosening, and the other end of the upper rope loop is connected to the crane hook; the lower rope loop is connected to the lower unloading key through the lower unloading key pin shaft, the lower unloading key pin shaft after connection is screwed on the upper and lower unloading key nuts, and the lower unloading key cotter pin is used to prevent loosening, and the other end of the lower rope loop is connected to the lifting protrusion on the low-pressure outer upper cylinder.

[0014] A chain-type lifting and adjusting method for a low-pressure cylinder of a steam turbine comprises the following steps: four assembled adjusting devices are hung on a crane hook through an upper rope loop, with two sets hung on one side;

[0015] Lift the hook head until the adjusting device leaves the ground, check the length of each set of adjusting devices, and rotate the upper and lower adjusting sleeves and the middle chain part clockwise or counterclockwise to adjust, control the length of the threads of the upper and lower unloading clasps in the upper and lower adjusting sleeves, so that the length of each set of adjusting devices is consistent;

[0016] Move the crane to the top of the low-pressure outer upper cylinder, find the center, hang the four lower rope loops of the adjusting device on the four hanging ears of the low-pressure outer upper cylinder respectively, and adjust the position of the crane according to the tightness of the adjusting device;

[0017] After hooking, if you need to adjust the length of one of the adjusting devices, you can move the hook head downward to make the adjusting device in a stress-free state, and at the same time rotate the upper adjusting sleeve, the lower adjusting sleeve and the middle chain part to adjust;

[0018] After hooking, the cotter pins of the connecting pins of the four sets of adjustment devices must be checked to prevent the nuts from rotating and falling off;

[0019] During the process of the hook being stressed, check that the part in contact with the cylinder wall should be the chain part of the adjusting position of the adjusting device. The chain part is bent into an arc according to the shape of the cylinder wall to ensure that the adjusting threaded parts at both ends of the adjusting device fully bear the axial force.

[0020] After lifting, separate the adjusting device from the rope loop and apply butter to the adjusting device to prevent rust.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] (1) The present invention provides a chain-type lifting and adjusting device and method for a steam turbine low-pressure cylinder, which is easy to operate and can be tightly attached to the cylinder like a wire rope, thereby reducing the height of the adjusting device. When adjusting, there is no need to climb to the top of the cylinder and the operation can be performed while standing on a platform. When hooking, the four hoists can be adjusted to the same length through the adjusting device, thus solving the problem of inconsistent length when hoisting with a wire rope.

[0023] (2) The present invention provides a chain-type lifting and adjustment device and method for a steam turbine low-pressure cylinder, which saves lifting time and can relatively accurately adjust four lifting devices to the same length before lifting. The lifting center point position of the crane is adjusted by the tightness of the annular rope loop, so that each lifting point is in a uniform force state at the beginning of lifting, reducing process adjustments and improving the success rate of one-time lifting.

[0024] (3) The present invention provides a chain-type lifting and adjusting device and method for a low-pressure cylinder of a steam turbine. The middle part of the traditional basket bolt adjusting device is a whole, and the screws at both ends are screwed on the basket in the middle. Different from the traditional integral adjustment of the basket bolt, the present adjusting device adopts split adjustment, and the middle part adopts a chain type, which can rotate with the connecting pin shaft. The advantage is that the interference between the hanger and the cylinder surface causes the hanger to keep the adjusting bolt under vertical force even when the force is not in a straight line, ensuring that the mating thread is not damaged, and ensuring the long-term use of the adjusting device.

[0025] (4) The chain-type lifting and adjusting device and method for the low-pressure cylinder of a steam turbine provided by the present invention are beneficial to life safety. No matter whether it is length adjustment before lifting or adjustment after hooking, there is no need to climb high to make adjustments, thus reducing the risk of people falling from heights.

[0026] (5) The chain-type lifting and adjusting device and method for the low-pressure cylinder of a steam turbine provided by the present invention have a wide range of applications. The lifting and adjusting device has the advantages of a wire rope sling and an adjustable basket sling, and can be applied to the lifting of other large equipment with similar lifting difficulties. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A front view of a chain-type lifting and adjusting device for a low-pressure cylinder of a steam turbine provided by the present invention;

[0028] Figure 2 A left view of a chain-type lifting and adjusting device for a low-pressure cylinder of a steam turbine provided by the present invention;

[0029] Figure 3 A working schematic diagram of a chain-type lifting and adjusting device for a low-pressure cylinder of a steam turbine provided by the present invention;

[0030] In the figure: 1—upper unloading nut; 2—upper unloading pin; 3—upper unloading cotter pin; 4—upper unloading; 5—upper adjustment sleeve; 6—upper connecting block; 7—lower connecting block; 8—lower adjustment sleeve; 9—lower unloading; 10—lower unloading cotter pin; 11—lower unloading pin; 12—lower unloading nut; 13—connecting web I; 14—connecting web II; 15—connecting pin I nut; 16—connecting pin I cotter pin; 17— Connecting pin shaft I; 18—connecting pin shaft II nut; 19—connecting pin shaft II cotter pin; 20—connecting pin shaft II; 21—connecting pin shaft III nut; 22—connecting pin shaft III cotter pin; 23—connecting pin shaft III; 24—connecting pin shaft IV nut; 25—connecting pin shaft IV cotter pin; 26—connecting pin shaft IV; 27—low-pressure outer upper cylinder; 28—lower rope loop; 29—adjusting device; 30—upper rope loop; 31—crane hook. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] like Figure 1 and Figure 2 As shown, a chain-type lifting and adjusting device for a low-pressure cylinder of a steam turbine provided by the present invention comprises an upper unloading clasp 4, an upper adjusting sleeve 5, an upper connecting block 6, a lower connecting block 7, a lower adjusting sleeve 8, a lower unloading clasp 9, a connecting web Ⅰ 13, and a connecting web Ⅱ 14.

[0035] The upper adjusting sleeve 5 and the lower adjusting sleeve 8 are symmetrical structures, the upper unloading clasp 4 and the lower unloading clasp 9 are symmetrical structures, and the upper connecting block 6 and the lower connecting block 7 are symmetrical structures; the upper unloading clasp 4 is a U-shaped structure, and the lower end of the upper unloading clasp 4 is screwed into the upper adjusting sleeve 5 through a thread, and the length of the thread is used to adjust the length of the sling, and the thread in the upper adjusting sleeve 5 is a left-handed thread;

[0036] A groove is formed at the lower part of the upper adjusting sleeve 5, through holes are formed at both walls of the groove, through holes are formed at both ends of the upper connecting block 6, the through hole of the upper adjusting sleeve 5 is connected with the upper through hole of the upper connecting block 6 through a connecting pin shaft Ⅰ 17, the connected connecting pin shaft Ⅰ 17 is screwed onto the connecting pin shaft Ⅰ nut 15, and the connecting pin shaft Ⅰ cotter pin 16 is used to prevent loosening;

[0037] The connecting webs Ⅰ13 and Ⅱ14 are provided with through holes at relative positions, and the lower through hole of the upper connecting block 6 is connected with the connecting webs Ⅰ13 and Ⅱ14 through the connecting pin Ⅱ20. The connected connecting pin Ⅱ20 is screwed with the connecting pin Ⅱ nut 18, and the connecting pin Ⅱ cotter pin 19 is used to prevent loosening;

[0038] Through holes are respectively opened at both ends of the lower connecting block 7, and the upper through hole is connected with the connecting web Ⅰ13 and the connecting web Ⅱ14 through the connecting pin Ⅲ23. The connected connecting pin Ⅲ23 is screwed onto the connecting pin Ⅲ nut 21, and the connecting pin Ⅲ cotter pin 22 is used to prevent loosening;

[0039] The lower through hole of the lower connecting block 7 is connected to the lower adjusting sleeve 8 through the connecting pin shaft IV 26. The connected connecting pin shaft IV 26 is screwed onto the connecting pin shaft IV nut 24, and the connecting pin shaft IV cotter pin 25 is used to prevent loosening.

[0040] The lower unloading clasp 9 is screwed into the lower adjusting sleeve 8 through a thread, and the length of the thread is used to adjust the length of the sling. The thread in the lower adjusting sleeve 8 is a right-hand thread;

[0041] like Figure 3 As shown, it also includes a lower rope loop 28 and an upper rope loop 30, one end of the upper rope loop 30 is connected to the upper unloading 4 through the upper unloading pin shaft 2, the upper unloading pin shaft 2 after connection is screwed onto the upper unloading nut 1, and the upper unloading cotter pin 3 is used to prevent loosening, and the other end of the upper rope loop 30 is connected to the crane hook 31;

[0042] The lower rope ring 28 is connected to the lower unloading 9 through the lower unloading pin shaft 11. The connected lower unloading pin shaft 11 screws on the upper and lower unloading nut 12 and is prevented from loosening by the lower unloading cotter pin 10. The other end of the lower rope ring 28 is connected to the lifting protrusion on the low-pressure outer upper cylinder 27.

[0043] The present invention provides a chain-type lifting and adjusting method for a low-pressure cylinder of a steam turbine, comprising the following steps: four assembled groups of adjusting devices 29 are hung on a crane hook 31 through an upper rope loop 30, with two groups hung on one side.

[0044] Lift the hook head until the adjusting device 29 leaves the ground, check the length of each group of adjusting devices 29, and rotate the upper adjusting sleeve 5 and the lower adjusting sleeve 8 and the middle chain part clockwise or counterclockwise to adjust, control the length of the threads of the upper unloading clasp 4 and the lower unloading clasp 9 in the upper adjusting sleeve 5 and the lower adjusting sleeve 8, so that the length of each group of adjusting devices 29 is consistent.

[0045] The length of the thread in the adjusting sleeve is checked through the observation holes on the surface of the upper adjusting sleeve 5 and the lower adjusting sleeve 8 to prevent the upper unloading clasp 4 and the lower unloading clasp 9 from being screwed out of the upper adjusting sleeve 5 and the lower adjusting sleeve 8.

[0046] Move the crane to the top of the low-pressure outer upper cylinder, and after centering, hang the four lower rope loops 28 of the adjusting device 29 on the four hanging ears of the low-pressure outer upper cylinder respectively. Since the four adjusting devices 29 are of the same length, the position of the crane can be adjusted according to the tightness of the adjusting devices 29.

[0047] After hooking, if the length of one of the adjusting devices 29 needs to be adjusted, the hook head can be moved downward to make the adjusting device 29 in a stress-free state, and the upper adjusting sleeve 5 and the lower adjusting sleeve 8 and the middle chain part can be rotated to adjust. If the upper unloading clasp 4 and the lower unloading clasp 9 rotate with them during the adjustment process, they can be fixed by a pry bar.

[0048] After hooking, the cotter pins of the connecting pins of the four sets of adjustment devices must be checked to prevent the nuts from rotating and falling off.

[0049] During the process of lifting hook force, check that the part in contact with the cylinder wall should be the chain part of the adjusting position 29 of the adjusting device 29. The chain part is bent into an arc according to the shape of the cylinder wall to ensure that the adjusting threaded parts at both ends of the adjusting device fully bear the axial force. If the middle chain part of the adjusting device is short, causing the upper adjusting sleeve 5 and the upper unloading block 4 to be close to the surface of the cylinder, replace the upper connecting block 6 and the lower connecting block 7 in the adjusting device to increase the length of the middle chain.

[0050] The upper rope loop 28 and the lower rope loop 30 are both wire rope loops. For ease of adjustment, the lower rope loop 30 is a short rope loop and the upper rope loop 28 is a long rope loop. The length of the long rope loop is selected according to the actual situation on site.

[0051] After the lifting is completed, separate the adjusting device 29 from the rope loop and apply butter to the adjusting device 29 for maintenance to prevent rust.

[0052] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0053] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A chain-type lifting and adjusting device for a low-pressure cylinder of a steam turbine, characterized in that: The invention comprises an upper unloading clasp (4), an upper adjustment sleeve (5), an upper connecting block (6), a lower connecting block (7), a lower adjustment sleeve (8), a lower unloading clasp (9), a connecting web plate I (13), and a connecting web plate II (14); the upper adjusting sleeve (5) and the lower adjusting sleeve (8) are mutually symmetrical structures, the upper unloading clasp (4) and the lower unloading clasp (9) are mutually symmetrical structures, and the upper connecting block (6) and the lower connecting block (7) are mutually symmetrical structures; the lower end of the upper unloading clasp (4) is connected to the upper end of the upper adjustment sleeve (5), and the lower end of the upper adjustment sleeve (5) is connected to the upper end of the connecting block (6); the connecting web plate I (13) and the connecting web plate II (14) connect the lower end of the upper connecting block (6) to the upper end of the lower connecting block (7); the lower end of the lower connecting block (7) is connected to the upper end of the upper connecting block (6); the lower end of the lower connecting block (7) is connected to the upper end of the upper connecting block (6); the lower end of the lower connecting block (7) is connected to the upper end of the upper connecting block (6); the lower end of the upper connecting block (6) is connected to the upper end of the upper connecting block (7); the lower end of the upper connecting block (7) is connected to the upper end of the upper connecting block (6); the lower end of the upper connecting block (6) is connected to the upper end of the upper connecting block (6); the lower end of the upper connecting block (7 ...6) is connected to the upper end of the upper connecting block (6); The upper end of the lower adjusting sleeve (8) is connected; the lower end of the lower adjusting sleeve (8) is connected to the upper end of the lower unloading clasp (9); the upper unloading clasp (4) is a U-shaped structure, the lower end of the upper unloading clasp (4) is screwed into the upper adjusting sleeve (5) through a thread, the length of the thread screwed in is used to adjust the length of the sling, and the thread in the upper adjusting sleeve (5) is a left-hand thread; the lower part of the upper adjusting sleeve (5) is provided with a groove, the two walls of the groove are provided with through holes, and the two ends of the upper connecting block (6) are respectively provided with through holes, the through hole of the upper adjusting sleeve (5) is connected to the upper through hole of the upper connecting block (6) through a connecting pin shaft I (17), the connected connecting pin shaft I (17) is screwed onto the connecting pin shaft I nut (15), and the connecting pin shaft I cotter pin (16) is used to prevent loosening.

2. A chain-type lifting and adjusting device for a low-pressure cylinder of a steam turbine according to claim 1, characterized in that: The connecting webs I (13) and the connecting webs II (14) are provided with through holes at relative positions, and the lower through hole of the upper connecting block (6) is connected to the connecting webs I (13) and the connecting webs II (14) via a connecting pin shaft II (20). After the connection, the connecting pin shaft II (20) is screwed onto the connecting pin shaft II nut (18), and the connecting pin shaft II cotter pin (19) is used to prevent loosening.

3. A chain-type lifting and adjusting device for a low-pressure cylinder of a steam turbine according to claim 2, characterized in that: The two ends of the lower connecting block (7) are respectively provided with through holes, and the upper through hole is connected to the connecting web I (13) and the connecting web II (14) through a connecting pin III (23). After the connection, the connecting pin III (23) is screwed onto the connecting pin III nut (21), and the connecting pin III cotter pin (22) is used to prevent loosening.

4. A chain-type lifting and adjusting device for a low-pressure cylinder of a steam turbine according to claim 1, characterized in that: The lower through hole of the lower connecting block (7) is connected to the lower adjusting sleeve (8) via a connecting pin shaft IV (26). The connected connecting pin shaft IV (26) is screwed onto a connecting pin shaft IV nut (24) and is prevented from loosening by a connecting pin shaft IV cotter pin (25).

5. The chain-type lifting and adjusting device for a low-pressure cylinder of a steam turbine according to claim 1, characterized in that: The lower unloading nut (9) is screwed into the lower adjusting sleeve (8) through a thread, and the length of the thread is used to adjust the length of the sling, and the thread in the lower adjusting sleeve (8) is a right-hand thread.

6. A chain-type lifting and adjusting device for a low-pressure cylinder of a steam turbine according to claim 1, characterized in that: The utility model also comprises a lower rope loop (28) and an upper rope loop (30), one end of the upper rope loop (30) is connected to the upper unloading nut (1) through the upper unloading pin shaft (2), the upper unloading pin shaft (2) is screwed onto the upper unloading nut (1) after the connection, and the upper unloading cotter pin (3) is used to prevent loosening, and the other end of the upper rope loop (30) is connected to the crane hook (31); the lower rope loop (28) is connected to the lower unloading nut (9) through the lower unloading pin shaft (11), the lower unloading pin shaft (11) is screwed onto the upper unloading nut (12) after the connection, and the lower unloading cotter pin (10) is used to prevent loosening, and the other end of the lower rope loop (28) is connected to the lifting protrusion on the low-pressure outer upper cylinder (27).

7. The method for chain-type lifting and adjusting a low-pressure cylinder of a steam turbine according to claim 6, characterized in that: The method comprises the following steps: hanging four assembled adjustment devices (29) on a crane hook (31) through an upper rope loop (30), with two groups hanging on each side; Lift the hook head until the adjusting device (29) leaves the ground, check the length of each group of adjusting devices (29), and simultaneously rotate the upper adjusting sleeve (5) and the lower adjusting sleeve (8) and the middle chain part clockwise or counterclockwise to adjust, control the length of the threads of the upper unloading clasp (4) and the lower unloading clasp (9) in the upper adjusting sleeve (5) and the lower adjusting sleeve (8), so that the length of each group of adjusting devices (29) is consistent; Move the crane to the top of the low-pressure outer upper cylinder, find the center, hang the four lower rope loops (28) of the adjusting device (29) on the four hanging ears of the low-pressure outer upper cylinder respectively, and adjust the position of the crane according to the tightness of the adjusting device (29); After hooking, if the length of one of the adjusting devices (29) needs to be adjusted, the hook head can be moved downward to make the adjusting device (29) in a stress-free state, and the upper adjusting sleeve (5) and the lower adjusting sleeve (8) and the middle chain part can be rotated to adjust at the same time; After hooking, the cotter pins of the connecting pins of the four sets of adjusting devices (29) must be checked to prevent the nuts from rotating and falling off; During the process of the hook being stressed, check that the part in contact with the cylinder wall should be the chain part of the adjustment position of the adjustment device (29). The chain part is bent into an arc according to the shape of the cylinder wall to ensure that the adjustment threaded parts at both ends of the adjustment device fully bear the axial force. After the hoisting is finished, the adjusting device (29) is separated from the rope loop, and the adjusting device (29) is greased for maintenance to prevent rust.

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