A mobile assembly lathe for machining large rotary shaft parts

Abstract

This application provides a mobile assembly lathe for machining large rotary shaft parts. The lathe includes a power head and a hydrostatic support, as well as a coupling assembly, an axial limiting device, and a radial positioning device. The coupling assembly includes a coupling for connection to the power head, a connecting disc connected to the other end of the coupling, and a pressure plate assembly connecting the connecting disc and the rotary shaft part. The axial limiting device is arranged on the outer edge of the connecting disc and clamps a portion of the connecting disc body, limiting the movement of the connecting disc in the axial direction of the rotary shaft part. The radial positioning device is arranged on the hydrostatic support and includes a bearing and a clamping structure; the bearing has a curved support surface; the clamping structure includes two support surfaces with a preset inclined angle and symmetrically arranged on both sides of the bearing, which restrict the movement of the rotary shaft part in its radial direction. The lathe of this application can be quickly assembled on-site on any ground surface and has high machining accuracy.

Description

Technical Field

[0001] This application relates to the field of steam turbines, and more specifically, to a mobile assembly lathe for machining large rotating shaft parts. Background Technology

[0002] All rotating parts inside a steam turbine are called rotors. The rotors bear the rotational force of the steam on all the working blades and drive the generator rotor, main shaft pump, and other components to rotate. The rotor includes components such as the main shaft, steam seal teeth, and blades. In actual operation, faults such as journal damage, steam seal tooth abrasion, and blade damage may occur. Once a fault occurs, the rotor needs to be repaired to ensure the normal operation of the steam turbine.

[0003] However, considering the remote location of the power plant and the long maintenance cycle of the rotors, a large turning machine is currently set up on-site to perform rotor machining. However, the existing machine cannot position the rotor, which leads to easy backlash during radial machining and easy shaft movement during axial machining, and it is also impossible to machine the rotor end face. In addition, the components of the machine are usually assembled by splicing, which is complicated and makes it difficult to ensure the alignment between the components. Summary of the Invention

[0004] The purpose of this application is to provide a mobile assembly lathe for machining large rotary shaft parts. It solves the technical problem of how to design a lathe that can be installed, used, and disassembled immediately when the on-site installation conditions are difficult to meet the layout requirements of traditional large machine tools, while ensuring its own stability and machining accuracy.

[0005] This application provides a mobile assembly lathe for machining large rotary shaft parts, the lathe including a power head and a hydrostatic support, and further comprising:

[0006] The coupling assembly includes a coupling for connection to the power head, a connecting disc connected to the other end of the coupling, and a pressure plate assembly connecting the connecting disc and the rotary part;

[0007] An axial limiting device is arranged on the outer edge of the connecting disc and clamps a portion of the connecting disc body, used to limit the movement of the connecting disc in the axial direction of the rotary shaft part;

[0008] A radial positioning device, mounted on a hydrostatic bracket, includes a bearing and a clamping structure. The bearing is arranged on the contact surface between the hydrostatic bracket and the rotary shaft-like part, and forms a curved support surface. The clamping structure includes two support surfaces with a preset inclined angle and symmetrically arranged on both sides of the bearing. The two support surfaces are rotatably arranged relative to each other and restrict the rotary shaft-like part from moving in its radial direction when it is placed on the bearing.

[0009] In one embodiment, the line connecting the center of the two support surfaces and the center of the contact surface of the rotary shaft part is not higher than the center horizontal line of the rotary shaft part.

[0010] In one embodiment, the clamping structure further includes a support shaft and a screw. The support shaft is inclined at a preset angle, and the support surface is arranged at one end of the support shaft. The support shaft moves under the action of the screw and drives the support surface to move. When the support surface contacts the outer surface of the rotary shaft part, the support shaft is fixed to radially position the rotary shaft part.

[0011] In one embodiment, the axial limiting device includes a clamping assembly and a bracket, one end of which is fixedly connected to the power head, and the clamping assembly is fixed above the bracket and can be adjusted to a fixed position on the bracket to clamp the connecting disc.

[0012] In one embodiment, the axial limiting device further includes an oil pump assembly, the oil pump assembly including an oil pump body and an oil pump pipeline communicating with the oil pump body, the other end of the oil pump pipeline being disposed on the clamping assembly for injecting lubricating oil into the clamping assembly.

[0013] In one embodiment, the clamping assembly includes a fixing block, an adjusting block, and an adjusting screw; the fixing block is configured as a U-shaped structure, the connecting plate is placed inside the U-shaped structure, the adjusting block is arranged between the U-shaped structure and the connecting plate, and the adjusting screw is used to adjust the position of the adjusting block to clamp the connecting plate.

[0014] In one embodiment, a spherical pad and a spherical bearing base are provided between the bearing bush and the hydrostatic bracket. The spherical pad is arranged on the spherical bearing base, the bearing bush is fixed on the spherical structure, and the spherical bearing base is connected to the hydrostatic bracket. The bearing bush can rotate with the spherical pad on the spherical bearing base so that the bearing bush fits against the outer surface of the rotating shaft part.

[0015] In one embodiment, the connecting plate has a waist-shaped groove, which is opened along the circumference of the connecting plate at a preset interval. The pressure plate assembly is fixed to the connecting plate through the waist-shaped groove. By changing the position of the pressure plate assembly in the waist-shaped groove, it can clamp rotary shaft parts of different sizes.

[0016] In one embodiment, the system further includes a lathe base plate, on which the power head and the hydrostatic bracket are centered at a preset distance. Guide keys are arranged on the upper surface of the lathe base plate, and multiple jacks are spaced apart on both sides of the bottom of the lathe base plate along its length.

[0017] In one embodiment, the bottom of the static pressure bracket is provided with a first guide groove that matches the guide key, and the periphery of the static pressure bracket is provided with a roller assembly, which is used to raise the static pressure bracket and move the static pressure bracket to a predetermined position through the first guide groove.

[0018] In one embodiment, each roller assembly includes a first adjusting screw, a first fixing plate, a support block, and a roller; the bottom of the first fixing plate is provided with a concave structure, the support block is provided with a protruding structure embedded in the concave structure, and one end of the first adjusting screw is placed in the protruding structure for adjusting the distance between the first fixing plate and the support block.

[0019] In one embodiment, the system further includes a tool post assembly arranged at a preset position on the lathe base plate. The tool post assembly includes a tool post body and a support assembly. The support assembly includes an axial tool post and a base. The axial tool post is arranged parallel to the rotary shaft-like part axially close to the tool post body, and its surface is provided with multiple fixing holes. The base is arranged parallel to the rotary shaft-like part radially close to the lathe base plate, and its upper surface is provided with multiple radial keyways. The tool post body can adjust its radial position along the radial keyways.

[0020] In one embodiment, the lower surface of the base is provided with a plurality of second guide grooves, which are arranged in sequence radially along the rotary shaft-like part. A tool holder roller assembly is provided around the base, which raises the base and the radial position of the base is adjusted by placing different second guide grooves on the guide key.

[0021] In one embodiment, each of the tool holder roller assemblies includes a second fixing plate, a second adjusting screw, a support frame, and a tool holder roller, wherein the gap between the second fixing plate and the support frame is adjusted by the second adjusting screw.

[0022] In one embodiment, the tool post assembly further includes a tie rod symmetrically arranged on both sides of the base, one end of the tie rod being fixedly connected to the lathe base plate and the other end being connected to the base, so that the support assembly and the lathe base plate are connected as a whole.

[0023] The movable assembly lathe for machining large rotary shaft parts described in this application has the following advantages:

[0024] 1. This application achieves flexible connection between the power head and shaft parts by setting a coupling assembly and an axial limiting device, and axially positions the rotating shaft parts, thus solving the problem that shaft parts cannot be clamped by a fixed head chuck.

[0025] 2. By setting up bearing bushes and two clamping structures, radial positioning of rotary shaft parts is achieved, solving the problem that it is impossible to center rotary shaft parts by holding them with the center pin of a traditional machine tool, thus improving the machining accuracy of rotary shaft parts.

[0026] 3. By setting up two 6-meter-long lathe base plates, each weighing 6 tons, and rigidly connecting the two base plates, the various components used for machining rotary shaft parts are fixed and aligned through the base plates. This solves both the overall stability of the machine tool and the problem of difficulty in ensuring the alignment between components during on-site assembly and the complexity of the installation process.

[0027] 4. By installing jacks on the lathe base plate, the technical problem of the machine tool being difficult to level due to insufficient flatness of the ground at the power plant site, and the unstable placement of the bottom, which further affected the overall rigidity of the machine tool, was solved.

[0028] 5. By setting up a tool post assembly, the tool post is fixed on the lathe, and two horizontal tie rods are set up to connect the tool post and the base plate, which improves the rigidity of the tool post and avoids the problems of significant tool post vibration and frequent tool damage during the machining process. In addition, by setting up an axial tool post and a base, the tool post can move along the axial and radial directions of the rotary shaft parts, which can meet the machining of large-sized rotary shaft parts. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of a movable assembly lathe for machining large rotary shaft parts according to an embodiment of this application;

[0031] Figure 2 This is a schematic diagram illustrating the structure of a coupling assembly according to an embodiment of this application;

[0032] Figure 3 This is a schematic diagram illustrating the structure of a connecting disk according to an embodiment of this application;

[0033] Figure 4 This is a schematic diagram of an axial limiting device according to an embodiment of this application;

[0034] Figure 5 This is a top view of an axial limiting device according to an embodiment of this application;

[0035] Figure 6This is a schematic diagram of a radial positioning device according to an embodiment of this application;

[0036] Figure 7 This is a cross-sectional view of a radial positioning device according to an embodiment of this application;

[0037] Figure 8 This is a schematic diagram of the structure of a roller assembly according to an embodiment of this application;

[0038] Figure 9 This is a schematic diagram illustrating the structure of a lathe base plate according to an embodiment of this application;

[0039] Figure 10 This is a schematic diagram illustrating the connection structure of a lathe base plate according to an embodiment of this application;

[0040] Figure 11 This is a schematic diagram of the structure of a tool holder assembly according to an embodiment of this application;

[0041] Figure 12 This is a schematic diagram of the structure of a tool holder roller according to an embodiment of this application.

[0042] 100. Power head; 210. Coupling; 211. Connecting disc; 2111. Waist-shaped groove; 212. Pressure plate assembly; 220. Axial limiting device; 221. Clamping assembly; 2211. Fixing block; 2212. Adjusting block; 2213. Adjusting screw; 2214. Pin; 222. Bracket; 223. Oil pump assembly; 2231. Oil pump body; 2232. Oil pump pipeline; 300. Static pressure bracket; 310. Roller assembly; 311. First adjusting screw; 312. Fastening screw; 313. First fixing plate; 314. Support block; 315. Roller; 316. First bearing; 317. First center pin; 320. Clamping assembly; 330. First guide groove; 400. Radial positioning device; 410. Bearing shell; 411. 412. Spherical pad; 423. Spherical bearing base; 424. Clamping structure; 425. Support surface; 426. Support shaft; 427. Screw; 428. Locking block; 500. Lathe base plate; 510. Jack; 520. Double-ended stud; 530. Positioning pin; 600. Tool post assembly; 610. Tool post body; 620. Axial tool post; 630. Base; 631. Radial keyway; 632. Second guide groove; 640. Tie rod; 650. Base plate pad; 660. Tool post roller assembly; 6601. Second fixing plate; 6602. Second adjusting screw; 6603. Second bearing; 6604. Connecting plate; 6605. Support frame; 6606. Second center pin; 6607. Tool post roller; 661. Upper pad; 662. Lower pad. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0044] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0045] Due to the remote location of the power plant and the long maintenance cycle of the rotors after leaving the factory, a lathe that can be installed and used immediately on-site is needed, while also possessing high rigidity and machining accuracy. The problems this machine tool needs to solve are: First, compared to traditional large lathes, this lathe cannot be pre-installed and fixed on-site; how to ensure the machine tool's rigidity and machining accuracy? Second, traditional large lathes have fixed headstock, chuck, center, and tailstock structures to ensure the rotational alignment and axial limit of large parts during clamping, and to provide the main turning rotation motion. However, for on-site mobile assembly lathes, to facilitate installation, pre-installed foundation components are not possible, making traditional lathe clamping methods infeasible. Third, on-site, the ground has uneven surfaces, and levelness is difficult to guarantee; how to ensure the stability of the machine tool during machining and provide its own leveling adjustment function? Fourth, the lathe has many components, and there are high-precision positioning dimensions between them; how to quickly and accurately install all components of the machine tool? Fifth, for machining large shaft-type parts, how can the tool post of an assembled lathe provide sufficient axial machining stroke while ensuring sufficient rigidity, especially when machining parts with high hardness after grinding? To solve the above problems, the inventors have invented a movable assembled lathe for machining large rotary shaft-type parts, which will be described in detail below:

[0046] Figure 1 This is a schematic diagram illustrating the structure of a movable assembly lathe for machining large rotary shaft parts according to an embodiment of this application. See also... Figure 1 The lathe includes a power head 100 and a hydrostatic support 300, as well as a coupling assembly, an axial limiting device 220 and a radial positioning device 400. Figure 2 See the schematic diagram of a coupling assembly according to an embodiment of this application. Figure 2The coupling assembly includes a coupling 210 for connection to the power head 100, a connecting disc 211 connected to the other end of the coupling 210, and a pressure plate assembly 212 connecting the connecting disc 211 and the rotating parts. An axial limiting device 220 is arranged on the outer edge of the connecting disc 211 and clamps a portion of the disc body, limiting the movement of the connecting disc 211 in the axial direction of the rotating shaft parts. A radial positioning device 400 is arranged on the hydrostatic bracket 300. Figure 2 This is a schematic diagram of a radial positioning device according to an embodiment of this application. See also... Figure 2 The radial positioning device 400 includes a bearing shell 410 and a clamping structure 420. The bearing shell 410 is arranged on the contact surface between the hydrostatic bracket 300 and the rotary shaft part, and forms a curved support surface. The clamping structure 420 includes two support surfaces 421 with a preset inclined angle and symmetrically arranged on both sides of the bearing shell 410. The two support surfaces 421 are rotatably arranged relative to each other and restrict the movement of the rotary shaft part in its radial direction when the rotary shaft part is placed on the bearing shell 410.

[0047] In the above implementation process, by setting up a coupling assembly connecting the power head 100 and an axial limiting device 220 for limiting the coupling assembly, the axial positioning of the rotary shaft parts is achieved, allowing the rotary shaft parts to rotate within the rotation area of ​​the connecting plate 211, thus preventing axial movement. Connecting the connecting plate and the power head using a coupling can meet the rotational requirements and installation accuracy of the 5mm eccentricity between the rotary shaft parts and the power head. Furthermore, by setting a clamping structure 420 on the hydrostatic bracket 300, with the support surface 421 of the clamping structure 420 inclined on both sides of the bearing shell 410, the rotary shaft parts are supported and limited, preventing radial backlash during turning. This achieves axial and radial limiting of the rotary shaft parts, improving machining accuracy and shortening the machining cycle.

[0048] In one embodiment, since the rotary shaft part is placed on the bearing shell 410 of the hydrostatic bracket 300, a very thin oil film will form on its surface during the operation of the rotary shaft part on the bearing shell 410. In order to avoid the downward pressure of the clamping structure 420 causing unstable force on the rotary shaft part and affecting the oil film clearance, when setting the clamping structure 420, the line connecting the center of the two support surfaces 421 and the contact surface of the rotary shaft part is not higher than the center horizontal line of the rotary shaft part, so as to ensure that the support force of the support surface 421 on the rotary shaft part is from bottom to top.

[0049] In one embodiment, the axial limiting device 220 includes a clamping assembly 221 and a bracket 222, see [link to previous embodiment]. Figure 2One end of the bracket 222 is fixedly connected to the power head 100. The clamping assembly 221 is fixed above the bracket 222 and can be adjusted along the bracket 222 to clamp the limiting connecting plate 211.

[0050] In one embodiment, since there is rotational friction between the clamping assembly 221 and the connecting disc 211, in order to reduce frictional resistance, the axial limiting device 220 further includes an oil pump assembly 223. The oil pump assembly 223 includes an oil pump body 2231 and an oil pump pipeline 2232 communicating with the oil pump body. The oil pump body 2231 is arranged on the power head 100, and the other end of the oil pump pipeline 2232 is arranged on the clamping assembly 221 for injecting lubricating oil into the clamping assembly 221.

[0051] In one embodiment, the clamping assembly 221 includes a fixing block 2211, an adjusting block 2212, an adjusting screw 2213, and a pin 2214. See also... Figures 4-5 The fixing block 2211 is designed as a U-shaped structure, the connecting plate 211 is placed inside the U-shaped structure, the adjusting block 2212 is arranged between the U-shaped structure and the connecting plate 211, and is connected to the fixing block 2211 by the pin 2214. One end of the adjusting screw 2213 is connected to the adjusting block 2212, and the position of the adjusting block 2212 is adjusted by the adjusting screw 2213 to clamp the connecting plate 211.

[0052] In one implementation scheme, see Figures 6-7 The clamping structure 420 also includes a support shaft 422 and a screw 423. The support shaft 422 is inclined at a preset angle, and the support surface 421 is arranged at one end of the support shaft 422. In order to accommodate the radial positioning of rotary shaft parts of different sizes, a screw 423 is provided at the end of the support shaft 422. The support shaft 422 can move under the action of the screw 423 and drive the support surface 421 to move. When the support surface 421 contacts the outer surface of the rotary shaft part, the support shaft 422 is fixed by the locking block 424 to achieve radial positioning of the rotary shaft part. The diameter range of the rotary shaft parts machined by the lathe in this application is 300mm-700mm. In order to ensure that the rotary shaft parts within this diameter range meet the stress requirements and form a stable oil film gap on the bearing 410, the angle between the support shaft 422 and the center horizontal line of the rotary shaft part can be set at 15-20 degrees.

[0053] In one embodiment, to make the bearing 410 suitable for a range of rotating shaft parts and avoid frequent replacement of the bearing 410, a spherical pad 411 and a spherical bearing base 412 are provided between the bearing 410 and the hydrostatic bracket 300. See [link to previous embodiment]. Figure 7The spherical pad 411 is arranged on the spherical bearing base 412, and the bearing 410 is fixed on the spherical pad 411. The spherical bearing base 412 is connected to the hydrostatic bracket 300. The bearing 410 rotates on the spherical bearing base 412 with the spherical pad 411 so that the bearing 410 fits against the outer surface of the rotating shaft part.

[0054] Figure 3 This is a schematic diagram of a connecting disk according to an embodiment of this application. See also... Figure 3 In order to enable the connecting plate 211 to clamp rotating shaft parts of different sizes, a waist-shaped groove 2111 is provided on the connecting plate 211. The waist-shaped groove 2111 is opened along the circumference of the connecting plate 211 at a preset interval. The pressure plate assembly 212 is fixed on the connecting plate 211 through the waist-shaped groove 2111. By changing the position of the pressure plate assembly 212 in the waist-shaped groove 2111, rotating shaft parts of different sizes can be clamped.

[0055] In one embodiment, the system further includes a lathe base plate 500, a power head 100, and a hydrostatic bracket 300, which are centered on the lathe base plate 500 at preset distances. The lathe base plate 500 has multiple miniature jacks 510 spaced at preset distances on both sides of its bottom along its length. (See also...) Figure 10 This is used to ensure that the top of the lathe base plate 500 is on the same horizontal plane. The lathe base plate 500 includes multiple segments. Figure 10 This is a schematic diagram of the connection structure of a lathe base plate according to an embodiment of this application. See also... Figure 10 The segments are positioned by locating pins 530 and then connected into one piece by double-ended studs 520.

[0056] In one embodiment, when the lathe base plate 500 is adjusted to a horizontal state by the miniature jack 510, the power head 100 and the hydrostatic bracket 300 are on the same horizontal plane. To fine-tune the power head 100 and the hydrostatic bracket 300 so that the centers of the supporting or connecting rotary shaft-like parts are aligned on a central line, a roller assembly 310, a clamping assembly 320, and a first guide groove 330 are provided at the bottom of the hydrostatic bracket 300. The roller assembly 310 can raise the height of the hydrostatic bracket 300. After the roller assembly 310 slightly raises the hydrostatic bracket 300 as a whole, the hydrostatic bracket 300 can move along the guide key on the lathe base plate 500 through the first guide groove 330 to adjust its position. Once the position is determined, the roller assembly 310 is loosened, and the clamping assembly 320 is tightened to fix the hydrostatic bracket 300 on the lathe base plate 500. Meanwhile, a roller assembly 310 is also provided at the bottom of the power head 100 to adjust the position and height of the power head 100.

[0057] Figure 8 This is a schematic diagram of a roller assembly according to an embodiment of this application. See also... Figure 8 The roller assembly 310 includes a first adjusting screw 311, a fastening screw 312, a first fixing plate 313, a support block 314, and a roller 315. The support block 314 and the roller 315 are connected by a first bearing 316 and a first center pin 317. The bottom of the first fixing plate 313 is recessed, and the support block 314 has a protruding structure that is embedded in the recessed structure. The first adjusting screw 311 passes through the first fixing plate 313 and is inserted into the protruding structure of the support block 314. The height of the hydrostatic bracket 300 is finely adjusted by adjusting the gap between the protruding structure and the recessed structure using the first adjusting screw 311.

[0058] In one embodiment, a tool holder assembly 600 is also included, see [link to previous embodiment]. Figure 11 The tool post assembly 600 includes a tool post body 610 and a support assembly. The tool post body 610 is fixed to the support assembly, which is connected to the lathe base plate 500. The support assembly includes an axial tool post 620, a base 630, an upper pad 661, a lower pad 662, and a base plate pad 650 arranged at the bottom of the base 630 and flush with the lathe base plate 500. The axial tool post 620 is arranged parallel to the axial direction of the rotating shaft-like parts and close to the tool post body 610. It has multiple fixing holes on its surface, allowing the tool post body 610 to change its axial position through these holes. The base 630 is parallel to the radial direction of the rotating shaft-like parts, with one end located on the top of the lathe base plate 500. The upper surface of the base 630 has multiple radial keyways 631. The lower pad 662 can move along the radial keyways 631 to radially change the position of the tool post body 610, adapting to the machining of rotating shaft-like parts of different sizes.

[0059] In one embodiment, the lower surface of the base 630 is provided with a plurality of second guide grooves 632 radially arranged along the rotary shaft-like parts, for adjusting the engagement position of the base 630 and the lathe base plate 500 to adjust the radial position of the tool post body 610.

[0060] In one embodiment, a tool holder roller assembly 660 is arranged around the base 630, see [reference]. Figure 12The tool post roller assembly 660 includes a second fixed plate 6601, a second adjusting screw 6602, a second bearing 6603, a connecting plate 6604, a support frame 6605, a second center pin 6606, and a tool post roller 6607. The second fixed plate 6601 is fixedly connected to the base 630. One end of the support frame 6605 is connected to the tool post roller 6607, and the other end of the support frame 6605 is provided with the connecting plate 6604 and the second bearing 6603. The second fixed plate 6601 is connected to the second bearing 6603 via the second adjusting screw 6602. By rotating the second adjusting screw 6602, the height of the second fixed plate 6601 can be adjusted, causing the base 630 to move accordingly. When the base 630 is slightly raised, the second guide groove 632 on the base 630 moves along the guide key of the lathe base plate 500, allowing the tool post assembly 600 to move to the machining position of the rotary shaft-type part.

[0061] In one embodiment, the tool post assembly 600 further includes a tie rod 640, which is symmetrically arranged on both sides of the base 630. One end of the tie rod 640 is fixedly connected to the lathe base plate 500, and the other end is connected to the base plate pad 650, so that the support assembly and the lathe base plate 500 are connected as a whole, thereby increasing the rigidity of the tool post assembly 600.

[0062] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A movable assembly lathe for machining large rotary shaft parts, the lathe comprising a power head (100) and a hydrostatic support (300), characterized in that, The lathe also includes: The coupling assembly includes a coupling (210) for connection to the power head, a connecting disc (211) connected to the other end of the coupling (210), and a pressure plate assembly (212) connecting the connecting disc (211) and the rotary shaft part. An axial limiting device (220) is arranged on the outer edge of the connecting disc (211) and clamps a portion of the disc body of the connecting disc (211), used to limit the movement of the connecting disc (211) in the axial direction of the rotary shaft part; the axial limiting device (220) includes a clamping assembly (221) and a bracket (222), one end of the bracket (222) is fixedly connected to the power head (100), and the clamping assembly (221) is fixed above the bracket (222) and can be positioned on the bracket (222). The clamping assembly (221) includes a fixing block (2211), an adjusting block (2212), and an adjusting screw (2213). The fixing block (2211) is U-shaped, the connecting disc (211) is placed inside the U-shaped structure, the adjusting block (2212) is arranged between the U-shaped structure and the connecting disc (211), and the adjusting screw (2213) is used to adjust the position of the adjusting block (2212) to clamp the connecting disc (211). A radial positioning device (400) is mounted on a hydrostatic bracket (300) and includes a bearing shell (410) and a clamping structure (420). The bearing shell (410) is arranged on the contact surface between the hydrostatic bracket (300) and the rotating shaft-like part, and forms a curved support surface. The clamping structure (420) includes two support surfaces (421) with a preset inclined angle and symmetrically arranged on both sides of the bearing shell (410). The two support surfaces (421) are rotatably arranged relative to each other and restrict the rotating shaft-like part when it is placed on the bearing shell (410). The rotary shaft-type part moves in its radial direction; the clamping structure (420) also includes a support shaft (422) and a screw (423). The support shaft (422) is inclined at a preset angle, and the support surface (421) is arranged at one end of the support shaft (422). The support shaft (422) moves under the action of the screw (423) and drives the support surface (421) to move. When the support surface (421) contacts the outer surface of the rotary shaft-type part, the support shaft (422) is fixed to radially position the rotary shaft-type part.

2. A movable assembly lathe for machining large rotary shaft parts according to claim 1, characterized in that, The connecting plate (211) has a waist-shaped groove (2111) with a preset spacing along the circumference of the connecting plate (211). The pressure plate assembly (212) is fixed on the connecting plate (211) through the waist-shaped groove (2111). By changing the position of the pressure plate assembly (212) in the waist-shaped groove (2111), it can clamp rotary shaft parts of different sizes.

3. A movable assembly lathe for machining large rotary shaft parts according to claim 1, characterized in that, The line connecting the center of the two support surfaces (421) and the center of the contact surface of the rotary shaft part is not higher than the center horizontal line of the rotary shaft part.

4. A movable assembly lathe for machining large rotary shaft parts according to claim 1, characterized in that, The axial limiting device (220) further includes an oil pump assembly (223), which includes an oil pump body (2231) and an oil pump pipeline (2232) connected to the oil pump body. The other end of the oil pump pipeline (2232) is arranged on the clamping assembly (221) for injecting lubricating oil into the clamping assembly (221).

5. A movable assembly lathe for machining large rotary shaft parts according to claim 1, characterized in that, A spherical pad (411) and a spherical bearing base (412) are provided between the bearing bush (410) and the hydrostatic bracket (300). The spherical pad (411) is arranged on the spherical bearing base (412). The bearing bush (410) is fixed on the spherical pad (411). The spherical bearing base (412) is connected to the hydrostatic bracket. The bearing bush (410) can rotate with the spherical pad (411) on the spherical bearing base (412) so that the bearing bush (410) fits against the outer surface of the rotating shaft part.

6. A movable assembly lathe for machining large rotary shaft parts according to claim 1, characterized in that, It also includes a lathe base plate (500), the power head (100) and the hydrostatic bracket (300) are arranged on the lathe base plate (500) at a preset distance, the upper surface of the lathe base plate (500) is provided with guide keys, and multiple jacks (510) are arranged at intervals on both sides of the bottom of the lathe base plate (500) along the length direction of the lathe base plate (500).

7. A movable assembly lathe for machining large rotary shaft parts according to claim 6, characterized in that, The bottom of the static pressure bracket (300) is provided with a first guide groove (330) matching the guide key, and the static pressure bracket (300) is provided with a roller assembly (310) around its perimeter. The roller assembly (310) is used to raise the static pressure bracket (300) and move the static pressure bracket (300) to a predetermined position through the first guide groove (330).

8. A movable assembly lathe for machining large rotary shaft parts according to claim 7, characterized in that, Each of the roller assemblies (310) includes a first adjusting screw (311), a first fixing plate (313), a support block (314), and a roller (315); the bottom of the first fixing plate (313) is provided with a concave structure, the support block (314) is provided with a protruding structure that is embedded in the concave structure, one end of the first adjusting screw (311) is placed in the protruding structure, and the distance between the first fixing plate (313) and the support block (314) is adjusted by rotating the first adjusting screw (311).

9. A movable assembly lathe for machining large rotary shaft parts according to claim 6, characterized in that, It also includes a tool post assembly (600), which is arranged on the lathe base plate (500) at a preset position; the tool post assembly (600) includes a tool post body (610) and a support assembly, the support assembly includes an axial tool post (620) and a base (630), the axial tool post (620) is arranged parallel to the rotary shaft part axially close to the tool post body (610), and its surface is provided with a plurality of fixing holes; the base (630) is arranged parallel to the rotary shaft part radially close to the lathe base plate (500), the upper surface of the base (630) is provided with a plurality of radial keyways (631), and the tool post body (610) can adjust its radial position along the radial keyways (631).

10. A movable assembly lathe for machining large rotary shaft parts according to claim 9, characterized in that, The lower surface of the base (630) is provided with a plurality of second guide grooves (632), which are arranged in sequence along the radial direction of the rotary shaft-like parts. Tool holder roller assemblies (660) are arranged around the base. The tool holder roller assemblies (660) are used to raise the base (630), and the radial position of the base (630) can be adjusted by placing different second guide grooves (632) on the guide key.

11. A movable assembly lathe for machining large rotary shaft parts according to claim 10, characterized in that, Each of the tool holder roller assemblies (660) includes a second fixing plate (6601), a second adjusting screw (6602), a support frame (6605), and a tool holder roller (6607), wherein the gap between the second fixing plate (6601) and the support frame (6605) is adjusted by the second adjusting screw (6602).

12. A movable assembly lathe for machining large rotary shaft parts according to claim 9, characterized in that, The tool post assembly (600) also includes a pull rod (640), which is symmetrically arranged on both sides of the base (630). One end of the pull rod (640) is fixedly connected to the lathe base plate (500), and the other end is connected to the base (630), so that the support assembly and the lathe base plate (500) are connected as a whole.

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