A method of assembling a gas turbine front shaft head with a center tie rod

Abstract

The application discloses a gas turbine front shaft head and center pull rod assembling method in the technical field of gas turbine rotor assembling, which comprises the following steps: S4: the center pull rod is turned over and hoisted through hoisting equipment, elastic reference element and rotating hanger ring, and the center pull rod is in a vertical state, and the length change amount of the elastic reference element is obtained; S6: the front shaft head is coaxially fixed below the center pull rod; S7: the center pull rod is rotated, and the threaded connection end of the center pull rod is screwed into the threaded blind hole of the front shaft head; during the screwing process, the length change amount of the elastic reference element is constant. The center pull rod and the front shaft head are screwed in the vertical state, the center pull rod is controlled to move towards the front shaft head while being rotated through the hoisting equipment, the elastic reference element and the rotating hanger ring, the rapid assembling of the center pull rod and the front shaft head is realized, and the assembling efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of gas turbine rotor assembly technology, specifically to a method for assembling the front shaft head and center tie rod of a gas turbine. Background Technology

[0002] The rotor of a gas turbine consists of a central tie rod, a front axle head, and several rotor discs. During the assembly of the gas turbine rotor, the central tie rod and the front axle head must first be assembled together. The AE64.3A gas turbine is a 75MW F-class heavy-duty gas turbine from Ansaldo Energia, Italy. The front axle head has a threaded blind hole at the center of the end face facing the rotor discs. The thread length of the blind hole is 165mm, and the thread parameter is M168*3. There are backing wheels at both ends of the front axle head, and a journal section in the middle. The total weight of the front axle head is 762kg. One end of the central tie rod of this gas turbine has an external thread with a thread length of 165mm and a parameter of M168*3. Excluding the threaded section, the central tie rod is 3.5m long and weighs 864kg.

[0003] The assembly method used abroad is as follows: First, the center tie rod is placed horizontally on the roller bracket. Simultaneously, a special adjustable roller bracket is used to support the axle head, and a high-precision overhead crane is used to lift and adjust the front axle head to be level. Then, the relative center positions of the front axle head and the center tie rod are precisely adjusted using the overhead crane before screwing them in. While rotating the front axle head, the overhead crane must coordinate with the feed along the travel axis. This method not only heavily relies on a finely adjustable overhead crane, but the thread engagement quality is also affected by the skill level of the overhead crane operator. Because the necessary finely adjustable overhead crane and the corresponding operators are lacking in China, this method cannot be used domestically.

[0004] Patent CN101633113A discloses a tool and assembly method for assembling a gas turbine shaft head and a central tie rod. This method involves supporting both ends of the front shaft head on V-shaped supports and using linear guides and a slide to move the front shaft head axially on the machine bed. The central tie rod is horizontally supported by two V-shaped supports. As the central tie rod rotates, it pushes the front shaft head towards the central tie rod, causing the threaded section of the central tie rod head to screw into the threaded blind hole of the front shaft head's engagement part, until the central tie rod and the front shaft head are fully engaged. This method achieves assembly through a combination of central tie rod rotation and horizontal movement of the front shaft head. However, in long-term production practice, this method still has some shortcomings:

[0005] 1. During the engagement process, the threaded section of the center tie rod engages with the front axle head by turning three full turns and then turning back half a turn. This engagement method requires the front axle head to frequently change its direction of movement, and the distance the front axle head moves each time is small, making it difficult to guarantee accuracy. As a result, the assembly success rate of the center tie rod and the front axle head is low.

[0006] 2. Fixing the front axle head on the V-shaped frame is quite complicated, and it is inconvenient to accurately adjust the forward and backward movement distance of the slide on the bed. Furthermore, the quality of thread engagement is easily affected by the operator's skill level. It takes 7 days to complete one horizontal assembly, which is too inefficient. Summary of the Invention

[0007] In view of this, the purpose of the present invention is to provide a method for assembling the front axle head and the center tie rod of a gas turbine, so as to solve the technical problem of low assembly efficiency in existing assembly methods.

[0008] The technical solution adopted in this invention is: a method for assembling a gas turbine front axle head and a center tie rod, the assembly method comprising:

[0009] S4: The central tie rod is flipped and lifted using lifting equipment, an elastic reference component, and a rotating lifting ring, and the central tie rod is placed in a vertical state, while the length change of the elastic reference component is obtained.

[0010] S6: Coaxially fix the front axle head to the bottom of the central tie rod;

[0011] S7: Rotate the central tie rod so that the threaded connection end of the central tie rod is screwed into the threaded blind hole of the front axle head; during the engagement process, the length change of the elastic reference element remains constant.

[0012] Furthermore, the elastic reference component includes a sleeve, a spring, an extension rod, a movable end cap, and a fixed end cap. The fixed end cap is fixedly connected to the bottom end of the sleeve, and the movable end cap is slidably connected to the sleeve along the axial direction. One end of the extension rod is fixedly connected to the movable end cap, and the other end passes through the fixed end cap and extends out of the sleeve. The spring is sleeved on the extension rod and connected between the movable end cap and the fixed end cap.

[0013] Furthermore, the assembly method also includes S2: horizontally pre-lifting the central tie rod using lifting equipment, an elastic reference member, and slings, and marking the position of the protruding rod of the elastic reference member.

[0014] Furthermore, the assembly method also includes S5: checking whether the length change of the elastic reference member in S4 matches the mark position in step S2; if yes, then execute S6; otherwise, return to S2.

[0015] Furthermore, S4 includes:

[0016] S41: Screw one end of the rotating ring into the lifting threaded hole at the non-threaded end of the central tie rod;

[0017] S42: The lifting equipment and the rotating ring are connected by an elastic reference element, and the threaded connection end of the central tie rod is connected to the lifting equipment by a sling.

[0018] S43: The central tie rod is rotated counterclockwise by using different lifting speeds at both ends of the central tie rod with lifting equipment.

[0019] Furthermore, S6 includes: fixing the front axle head to the support base directly below the center tie rod, and adjusting the radial position of the front axle head so that the front axle head is coaxial with the center tie rod;

[0020] The parallelism between the central tie rod and the front axle head is no greater than 0.03 mm, and the axial deviation is no greater than 0.02 mm.

[0021] Furthermore, the support base includes a fixed base, a base plate, and an arc-shaped bearing plate. The base plate is provided with a clearance hole communicating with the inner cavity of the fixed base. At least two arc-shaped bearing plates are detachably connected to the base plate. An arc-shaped positioning platform is provided on the arc-shaped bearing plate. A shoulder for supporting the front axle head is formed between the arc-shaped bearing plate and the arc-shaped positioning platform. Positioning screws for adjusting the radial position of the front axle head are evenly distributed around the circumference of the arc-shaped positioning platform.

[0022] Furthermore, the assembly method also includes S1: applying lubricant to the threaded blind hole of the front axle head and the threaded connection end of the center tie rod.

[0023] Furthermore, the assembly method also includes S3: fixing a lightweight rotary tool to the central pull rod;

[0024] The rotating tool includes a first semi-circular tool, a second semi-circular tool, and a connector. The inner sides of both the first and second semi-circular tools are provided with semi-circular hoops that mate with the outer circumferential surface of the central pull rod. The connector is detachably connected between the first and second semi-circular tools.

[0025] Furthermore, S7 includes: rotating the center tie rod in a clockwise rotation of three turns plus a counterclockwise rotation of half a turn, so that the threaded connection end of the center tie rod is evenly and smoothly screwed into the threaded blind hole of the front axle head.

[0026] The beneficial effects of this invention are:

[0027] 1. This invention adopts a method in which the central tie rod and the front axle head are screwed together in a vertical state. By controlling the central tie rod to rotate and move towards the front axle head through lifting equipment, elastic reference parts and rotating lifting rings, the assembly of the central tie rod and the front axle head is realized quickly, which improves the assembly efficiency.

[0028] 2. This invention uses an elastic reference element to balance the gravity of the central tie rod, preventing excessive weight of the central tie rod from causing cutting motion between the threads and leading to thread seizing; the change in length of the elastic reference element displays the stress state of the central tie rod in real time, making it easy for operators to adjust the vertical height of the central tie rod in a timely manner.

[0029] 3. The present invention supports and positions the front axle head by means of a support base. By adjusting the radial position of the front axle head on the support base, the coaxiality of the front axle head and the center tie rod can be effectively ensured.

[0030] 4. The present invention uses a rotating tool to drive the central tie rod to rotate, which prevents the central tie rod from shifting or shaking during the rotation process.

[0031] 5. This invention innovatively adopts a method of vertically lifting the central tie rod with an elastic reference component. During the rotational feeding of the central tie rod in the direction of the thread axis, when the actual state of the elastic reference component is different from the marked position, the magnitude of the force on the elastic reference component is corrected by finely adjusting the position of the crane hook. This ensures that the force borne by the elastic reference component is always equal to the self-weight of the central tie rod, effectively avoiding the impact of low precision of the inherent equipment of the crane on the assembly quality, and ensuring the precision and accuracy of the assembly.

[0032] 6. This invention innovatively adopts a feeding method in which the front axle head is fixed and the central tie rod moves forward while rotating, which solves the problem of inconsistent thread engagement speed between the manual axial feed motion of the front axle head and the rotation of the central tie rod. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the assembly of the front axle head and the center tie rod of the present invention;

[0034] Figure 2 This is a schematic diagram of the horizontal pre-lifting of the central tie rod of the present invention;

[0035] Figure 3 This is a schematic diagram of the structure of the elastic reference component;

[0036] Figure 4 This is a schematic diagram of the rotating tool.

[0037] Figure 5 Schematic diagram of the connector;

[0038] Figure 6 This is a schematic diagram of the structure supporting the base;

[0039] Figure 7 This is a structural diagram of the fixed base;

[0040] Figure 8 This is a flowchart of the assembly method of the present invention.

[0041] In the picture:

[0042] 10-Flexible reference component;

[0043] 11-Sleeve;

[0044] 12-Modible end cap;

[0045] 13-Extend the rod;

[0046] 14-Spring;

[0047] 15-Fixed end cap;

[0048] 20 - Rotating ring;

[0049] 30-Center tie rod;

[0050] 40-Front axle head;

[0051] 50 - Lifting slings;

[0052] 60 - Support base;

[0053] 61-Fixed base;

[0054] 611 - Upper flange;

[0055] 612 - Support column;

[0056] 613 - Lower flange;

[0057] 62-Base plate;

[0058] 63-Arc-shaped bearing plate;

[0059] 64 - Arc-shaped positioning stage;

[0060] 641 - Locating screw;

[0061] 65-bolt;

[0062] 66-Conical sleeve;

[0063] 67-Arc-shaped bracing;

[0064] 70-Rotation tool,

[0065] 71 - First semi-circular tool;

[0066] 72 - Second semi-circular tool;

[0067] 73-Semi-circular hoop;

[0068] 74-U-shaped frame;

[0069] 75-Angle Iron;

[0070] 76 - Reinforcing rib;

[0071] 77-Hook bolt;

[0072] 78 - Connecting pin;

[0073] 79 - Wing nut. Detailed Implementation

[0074] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. These embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0075] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0076] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0077] Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0078] Examples, such as Figure 1 , Figure 2 , Figure 8 As shown, a method for assembling a front axle head and a center tie rod of a gas turbine is disclosed. This assembly method is used for assembling a front axle head 40 and a center tie rod 30. The assembly method includes:

[0079] S1: Apply lubricant to the threaded blind hole of the front axle head 40 and the threaded connection end of the center tie rod 30.

[0080] S2: The central tie rod 30 is pre-lifted horizontally using the lifting equipment, the elastic reference 10, and the sling 50, and the change in length of the elastic reference 10 is marked.

[0081] S3: Secure the lightweight rotating tool 70 to the central pull rod 30.

[0082] S4: The central tie rod 30 is flipped and lifted by the lifting equipment, the elastic reference 10 and the rotating lifting ring 20 so that the central tie rod 30 is in a vertical state, and at the same time the length change of the elastic reference 10 is obtained.

[0083] S5: Check if the length change of the elastic reference 10 in S4 matches the mark in S2. If yes, proceed to S6; otherwise, return to S2.

[0084] S6: Coaxially fix the front axle head 40 to the bottom of the center tie rod 30.

[0085] S7: Rotate the center tie rod 30 so that the threaded connection end of the center tie rod 30 is screwed into the threaded blind hole of the front axle head 40; during the engagement process, the length change of the elastic reference part 10 remains constant.

[0086] S8: Check the quality of thread engagement.

[0087] This application adopts a method in which the central tie rod 30 and the front axle head 40 are threadedly engaged in a vertical state. The central tie rod 30 is controlled to rotate and move toward the front axle head 40 by lifting equipment, elastic reference 10 and rotating lifting ring 20, which realizes the rapid assembly of the central tie rod 30 and the front axle head 40 and improves the assembly efficiency.

[0088] In one specific embodiment, S4 specifically includes:

[0089] S41: Screw one end of the rotating lifting ring 20 into the lifting threaded hole at the non-threaded end of the central tie rod 30.

[0090] S42: The lifting equipment and the rotating ring 20 are connected by the elastic reference 10, and the threaded connection end of the central tie rod 30 is connected to the lifting equipment by the sling 50.

[0091] S43: The central tie rod 30 is rotated counterclockwise by using different lifting speeds at both ends of the central tie rod 30 with the lifting equipment.

[0092] S44: When the central tie rod 30 is flipped to an angle of 80° with the horizontal plane, disconnect the threaded connection end of the central railing 30 from the lifting equipment, and rotate the lifting ring 20 to flip the central tie rod 30 to a vertical state.

[0093] S45: Obtain the length change of the elastic reference part 10.

[0094] Preferred, such as Figure 3As shown, the elastic reference component 10 includes a sleeve 11, a spring 14, an extension rod 13, a movable end cap 12, and a fixed end cap 15. The fixed end cap 15 is fixedly connected to the bottom end of the sleeve 11. The movable end cap 12 is disposed inside the sleeve 11 and is slidably connected to the sleeve 11 axially. The top end of the extension rod 13 is fixedly connected to the movable end cap 12, and the bottom end passes through the fixed end cap 15 and extends out from inside the sleeve 11. The spring 14 is sleeved on the extension rod 13 and connected between the movable end cap 13 and the fixed end cap 15. This arrangement allows the spring 14 to balance the weight of the central tie rod 30, preventing excessive weight of the central tie rod 30 from causing cutting motion between the threads and leading to thread seizure. At the same time, the extension length of the extension rod 13 displays the stress state of the central tie rod 30 in real time, facilitating timely adjustment of the vertical height of the central tie rod 30 by the operator.

[0095] In one specific embodiment, S6 specifically includes: fixing the front axle head 40 onto the support base 60 directly below the center tie rod 30, and adjusting the radial position of the front axle head 40 so that the front axle head 40 is coaxial with the center tie rod 30; wherein the parallelism between the center tie rod 30 and the front axle head 40 is not greater than 0.03mm, and the axial deviation is not greater than 0.02mm.

[0096] Preferred, such as Figure 5 , Figure 6 As shown, the support base 60 includes a fixed base 61, a base plate 62, and an arc-shaped support plate 63. The hollow fixed base 61 is fixedly mounted on the ground. The disc-shaped base plate 62 is fixedly mounted on the top of the fixed base 61. The base plate 62 has a clearance hole communicating with the inner cavity of the fixed base 61. At least two arc-shaped support plates 63 are detachably connected to the base plate 62. The arc-shaped support plate 63 has an arc-shaped positioning platform 64. A shoulder for supporting the front axle head 40 is formed between the arc-shaped support plate 63 and the arc-shaped positioning platform 64. Positioning screws 641 for adjusting the radial position of the front axle head 40 are evenly distributed around the circumference of the arc-shaped positioning platform 64. This arrangement not only achieves the support and fixation of the front axle head 40, but also facilitates the adjustment of the radial position of the front axle head 40 to ensure that the front axle head 40 is coaxial with the center tie rod 30.

[0097] In one specific embodiment, S7 specifically includes: rotating the central tie rod 30 by rotating it three turns clockwise and half a turn counterclockwise, so that the threaded connection end of the central tie rod 30 is evenly and smoothly screwed into the threaded blind hole of the front axle head 40; during the engagement process, the length change of the elastic reference member 10 remains constant.

[0098] Preferred, such as Figure 4As shown, the rotating tool 70 includes a first semi-circular tool 71, a second semi-circular tool 72, and a connecting piece. The inner sides of both the first and second semi-circular tools 71 and 72 are provided with semi-circular clamps 73 that mate with the outer circumferential surface of the central pull rod 30. The connecting piece is detachably connected between the first and second semi-circular tools 71 and 72. With this configuration, the central pull rod 30 can be rotated by the rotating tool 70 without shifting or wobbling during rotation.

[0099] It should be noted that the rotating tool 70 and the rotating ring 20 in this application weigh about 10 kg, which is negligible compared to the 864 kg weight of the central tie rod.

[0100] Specific embodiments, such as Figure 1-8 As shown, a method for assembling a front axle head and a center tie rod of a gas turbine is disclosed. This assembly method is used for assembling a front axle head 40 and a center tie rod 30. The assembly method includes:

[0101] S1: Apply lubricant to the threaded blind hole of the front axle head 40 and the threaded connection end of the center tie rod 30.

[0102] Specifically: S11: Use 50-grit sandpaper to polish the first 1 / 4 of the thread, reducing the thread size by 0.02-0.05mm; at the same time, thoroughly remove all oxide scale, dust, oil, rust spots and attachments to expose the metal color of the thread.

[0103] S12: Apply lubricant to the internal thread of the front axle head 40 and the external thread of the center tie rod 30. The material matrix is ​​ZrO2 and Ca3(PO4)2. Use a brush and a lint-free cloth to evenly apply a layer of lubricant to the thread surface.

[0104] S2: As Figure 2 As shown, with the central tie rod 30 in a horizontal position, the elastic reference element 10 is hung on the hook of the crane, and a sling 50 is tied to the bottom end of the elastic reference element 10. The sling 50 is generally in the shape of an isosceles triangle so that the center of gravity of the central tie rod 30 is directly below the elastic reference element 10, so as to facilitate the horizontal lifting of the central tie rod 30. After the central tie rod 30 is horizontally lifted, the change in length of the elastic reference element 10 is marked on the extension rod 13 of the elastic reference element 10 with a brightly colored marker.

[0105] like Figure 3As shown, the elastic reference component 10 includes a sleeve 11, a spring 14, an extension rod 13, a movable end cap 12, and a fixed end cap 15. The fixed end cap 15 is fixedly connected to the bottom end of the sleeve 11. The movable end cap 12 is disposed inside the sleeve 11 and is slidably connected to the sleeve 11 axially. The top end of the extension rod 13 is fixedly connected to the movable end cap 12, and the bottom end passes through the fixed end cap 15 and extends out of the sleeve 11. The spring 14 is sleeved on the extension rod 13 and connected between the movable end cap 13 and the fixed end cap 15. After the central tie rod 30 is horizontally lifted, the spring 14 is compressed under the gravity of the central tie rod 30, and the extension rod 13 moves downward. The corresponding positions of the extension rod 13 and the lower end face of the sleeve 11 are marked with a marker.

[0106] S3: Secure the lightweight rotating tool 70 to the central pull rod 30.

[0107] Specifically, the horizontal pre-lifting center tie rod 30 is first placed on the support, and then the aluminum rotating tool 70 is fixedly connected to the center tie rod 30. The rotating tool 70 includes two semi-circular structures, namely the first semi-circular tool 71 and the second semi-circular tool 72. Both the first semi-circular tool 71 and the second semi-circular tool 72 include an outer bend, a semi-circular hoop 73 and a reinforcing rib 76. The outer bend and the semi-circular hoop 73 are concentrically arranged, and the reinforcing rib 76 is radially connected between the outer bend and the semi-circular hoop 73. A rubber protective layer is provided on the inner side of both semi-circular hoops 73 to protect the center tie rod 30.

[0108] Four connectors are provided between the first semi-circular tool 71 and the second semi-circular tool 72 to connect the first semi-circular tool 71 and the second semi-circular tool into one unit. The connectors include a U-shaped frame 74, a hinge bolt 77, an angle iron 75, and a wing nut 79. The U-shaped frame 74 is fixedly installed on the side of the first semi-circular tool 71 near the second semi-circular tool 72. The angle iron 75 is fixedly installed on the side of the second semi-circular tool 72 near the first semi-circular tool 71. One end of the hinge bolt 77 is connected to the U-shaped frame 74 through a connecting pin 78, and the other end passes through the angle iron 75 and is threadedly connected to the wing nut 79.

[0109] S4: The central tie rod 30 is flipped and lifted by the lifting equipment, the elastic reference 10 and the rotating lifting ring 20 so that the central tie rod 30 is in a vertical state, and at the same time the length change of the elastic reference 10 is obtained.

[0110] Specifically: S41: The center of the non-threaded connection end of the center tie rod 30 is provided with a lifting threaded hole, into which the aluminum rotating lifting ring 20 is screwed.

[0111] S42: Hang the elastic reference 10 on the crane hook and connect the bottom end of the elastic reference 10 to the rotating ring 20. Connect the threaded end of the center tie rod 30 to the crane hook through the sling 50 and protect the bottom with a V-shaped wooden block.

[0112] S43: The center tie rod 30 is rotated counterclockwise by using different lifting speeds at both ends of the crane.

[0113] S44: When the central tie rod 30 is rotated to an angle of 80° with the horizontal plane, the threaded connection end of the central railing 30 is disconnected from the crane hook, and the central tie rod 30 is pulled up into a vertical state by rotating the lifting ring 20.

[0114] S45: Obtain the length change of the elastic reference part 10.

[0115] S5: Check if the length change of the elastic reference 10 in S45 is the same as the mark in S2. If yes, execute S6; otherwise, return to S2.

[0116] S6: Coaxially fix the front axle head 40 to the bottom of the center tie rod 30.

[0117] Specifically: S61: Fix the front axle head 40 to the support base 60.

[0118] like Figure 5 , Figure 6 As shown, the support base 60 includes a fixed base 61, a base plate 62, and an arc-shaped support plate 63. The hollow fixed base 61 is fixedly mounted on the ground. The disc-shaped base plate 62 is fixedly mounted on the top of the fixed base 61. The base plate 62 has a clearance hole communicating with the inner cavity of the fixed base 61. At least two arc-shaped support plates 63 are detachably connected to the base plate 62. The arc-shaped support plate 63 has an arc-shaped positioning platform 64. A shoulder for supporting the front axle head 40 is formed between the arc-shaped support plate 63 and the arc-shaped positioning platform 64. Positioning screws 641 for adjusting the radial position of the front axle head 40 are evenly distributed around the circumference of the arc-shaped positioning platform 64. This arrangement not only achieves the support and fixation of the front axle head 40, but also facilitates the adjustment of the radial position of the front axle head 40 to ensure that the front axle head 40 is coaxial with the center tie rod 30.

[0119] Preferably, the arc-shaped support plate 63 is a semi-circular plate, one of which is connected to the base plate 62 by bolts 65, and the other semi-circular plate is connected to the base plate 62 by a tapered sleeve 66 provided on the base plate 62. This arrangement facilitates the connection between the base plate 62 and the arc-shaped support plate 63, while preventing the arc-shaped support plate 63 from sliding.

[0120] The fixed base 61 includes an upper flange 611, support columns 612 and a lower flange 613. The lower flange 613 is fixedly connected to the ground by anchor bolts. Four support columns 612 are fixedly connected between the upper flange 611 and the lower flange 613. At the same time, an arc-shaped support rib 67 is provided between the upper flange 611 and the lower flange 613.

[0121] S62: Check whether the center tie rod 30 and the front axle head 40 are coaxial.

[0122] Check the levelness of the end face of the center tie rod 30 in the vertical position, which should be within 0.05mm / m.

[0123] Check the levelness of the end face of the front axle head 40 in a vertical position; the requirement is 0.05 mm / m.

[0124] The crane moves the center tie rod 30 so that the external thread end face of the center tie rod 30 is close to the blind hole end face of the front axle head 40, and the radial position of the center tie rod 30 is initially adjusted.

[0125] Use an inside micrometer to check that the axial distance deviation between the four points on the end face of the center tie rod 30 and the end face of the front axle head 40 is no greater than 0.03mm.

[0126] The radial position of the front axle head 40 is finely adjusted by the positioning screw 641 so that the axial deviation between the center tie rod 30 and the front axle head 40 is no more than 0.02mm.

[0127] Check the radial runout of the center tie rod 30. The radial runout should not exceed 0.03mm.

[0128] S7: Rotate the center tie rod 30 so that the threaded connection end of the center tie rod 30 is screwed into the threaded blind hole of the front axle head 40; during the engagement process, the length change of the elastic reference part 10 remains constant.

[0129] Specifically: Screw the center tie rod 30 evenly and smoothly into the front axle head 40. During the screwing process, constantly observe whether the load on the elastic reference part 10 changes. If it does, lower the center tie rod 30 using a crane. During engagement, screw in the three-threaded shaft clockwise and then back out half a turn counterclockwise. If it becomes increasingly tight, stop immediately; do not use brute force to screw the center tie rod 30 into the front axle head 40. After eliminating the effects of load changes on the elastic reference part 10, the perpendicularity of the center tie rod 30, the perpendicularity of the front axle head 40, the center alignment of the center tie rod 30 and the front axle head 40, and any looseness between the rotating tool 70 and the center tie rod 30, completely withdraw and return to step S6.

[0130] S8: Check the thread engagement quality by whether the engagement length meets the requirements.

[0131] Compared with the prior art, this application has at least the following advantages:

[0132] 1. This application innovatively adopts a method of screwing the center tie rod and the front axle head together in a vertical state, which shortens the assembly time of the center tie rod and the front axle head from 7 days to 1 day, thereby improving the assembly efficiency of the center tie rod and the front axle head.

[0133] 2. This application uses an elastic reference component to fully support the weight of the central tie rod, preventing excessive weight of the central tie rod from causing cutting motion between the threads, which could lead to thread seizing and improve the thread engagement quality.

[0134] 3. This application uses a special fixing tool for the front axle head to quickly adjust the position of the front axle head and the center tie rod, so that the parallelism between the front axle head and the center tie rod is no more than 0.03mm and the axis deviation is no more than 0.02mm.

[0135] 4. This application allows for convenient rotation of the central pull rod using a rotating tool, preventing any shifting or shaking during rotation.

[0136] 5. This application innovatively adopts a method of vertically lifting the central tie rod with an elastic reference component. During the rotational feeding of the central tie rod in the direction of the thread axis, when the actual state of the elastic reference component is different from the marked position, the magnitude of the force on the elastic reference component is corrected by finely adjusting the position of the crane hook. This ensures that the force borne by the elastic reference component is always equal to the self-weight of the central tie rod, effectively avoiding the impact of low precision of the inherent equipment of the crane on the assembly quality, and ensuring the precision and accuracy of the assembly.

[0137] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A method of assembling a gas turbine front shaft head to a center tie rod, the method comprising: The assembly method includes: S1: Apply lubricant to the threaded blind hole of the front axle head (40) and the threaded connection end of the center tie rod (30); S2: The central tie rod (30) is pre-lifted horizontally using lifting equipment, elastic reference (10) and slings (50), and the position of the extension rod (13) of the elastic reference (10) is marked; S3: Secure the lightweight rotating tool (70) to the central pull rod (30); S4: The central tie rod (30) is flipped and lifted by the lifting equipment, the elastic reference (10) and the rotating lifting ring (20), and the central tie rod (30) is placed in a vertical state, while the length change of the elastic reference (10) is obtained. S5: Check whether the length change of the elastic reference (10) in S4 matches the mark position in S2. If yes, execute S6; otherwise, return to S2. S6: Coaxially fix the front axle head (40) to the underside of the central tie rod (30); S7: Rotate the central tie rod (30) so that the threaded connection end of the central tie rod (30) is screwed into the threaded blind hole of the front axle head (40); during the engagement process, the length change of the elastic reference element (10) remains constant, and the descent of the central tie rod (30) is controlled by the lifting equipment; Wherein, S4 includes: S41: Screw one end of the rotating lifting ring (20) into the lifting threaded hole at the non-threaded end of the central tie rod (30); S42: The lifting equipment and the rotating ring (20) are connected by the elastic reference (10), and the threaded end of the central tie rod (30) is connected to the lifting equipment by the sling (50); S43: The central tie rod (30) is rotated counterclockwise by using different lifting speeds at both ends of the central tie rod (30) through the lifting equipment; S45: Obtain the length change of the elastic reference element (10) when the central tie rod (30) is in a vertical state.

2. The method for assembling the front axle head and center tie rod of a gas turbine according to claim 1, characterized in that, The elastic reference component (10) includes a sleeve (11), a spring (14), an extension rod (13), a movable end cap (12), and a fixed end cap (15). The fixed end cap (15) is fixedly connected to the bottom end of the sleeve (11). The movable end cap (12) is slidably connected to the sleeve (11) along the axial direction. One end of the extension rod (13) is fixedly connected to the movable end cap (12), and the other end passes through the fixed end cap (15) and extends out from the sleeve (11). The spring (14) is sleeved on the extension rod (13) and is located between the movable end cap (12) and the fixed end cap (15).

3. The method for assembling the front axle head and center tie rod of a gas turbine according to claim 1, characterized in that, The S6 includes: fixing the front axle head (40) on the support base (60) directly below the center tie rod (30), and adjusting the radial position of the front axle head (40) so that the front axle head (40) is coaxial with the center tie rod (30); The parallelism between the central tie rod (30) and the front axle head (40) is no greater than 0.03 mm, and the axial deviation is no greater than 0.02 mm.

4. The method for assembling the front axle head and center tie rod of a gas turbine according to claim 3, characterized in that, The support base (60) includes a fixed base (61), a base plate (62) and an arc-shaped bearing plate (63). The base plate (62) is provided with a clearance hole communicating with the inner cavity of the fixed base (61). At least two arc-shaped bearing plates (63) are detachably connected to the base plate (62). The arc-shaped bearing plate (63) is provided with an arc-shaped positioning platform (64). A shoulder for supporting the front axle head (40) is formed between the arc-shaped bearing plate (63) and the arc-shaped positioning platform (64). The arc-shaped positioning platform (64) is circumferentially distributed with positioning screws (641) for adjusting the radial position of the front axle head (40).

5. The method for assembling the front axle head and center tie rod of a gas turbine according to claim 1, characterized in that, The rotating tool (70) includes a first semi-circular tool (71), a second semi-circular tool (72), and a connector. The inner sides of the first semi-circular tool (71) and the second semi-circular tool (72) are provided with semi-circular hoops (73) that cooperate with the outer circumferential surface of the central tie rod (30). The connector is detachably connected between the first semi-circular tool (71) and the second semi-circular tool (72).

6. The method for assembling the front axle head and center tie rod of a gas turbine according to claim 1, characterized in that, The S7 includes rotating the central pull rod (30) by rotating it three times clockwise and half a turn counterclockwise, so that the threaded connection end of the central pull rod (30) is evenly and smoothly screwed into the threaded blind hole of the front axle head (40).

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