A large dual-speed, dual-disc radial feed device

Abstract

The present invention provides a large-scale dual-speed, dual-cutter radial feed device, wherein a first cutter disc and a second cutter disc are fixedly mounted on a boring bar, a first movable plate capable of radially feeding on the first cutter disc is mounted on the first cutter disc, and a second movable plate capable of radially feeding on the second cutter disc is mounted on the second cutter disc; a detachable gearbox cover is mounted on the end face of the front feeding section of the boring bar, and a gearbox cabin is provided between the gearbox cover and the end face of the front feeding section of the boring bar, and the axial rotation of the worm drives the radial feeding movement of the first screw rod, and the radial feeding movement of the screw rod drives the radial feeding of the movable plate. The device of the present invention is firstly used in horizontally sectioned turbine compressor casings, which solves the problem that the inner hole of a large casing cannot be processed, meets the installation accuracy requirements of the inner hole in the design drawings, and ensures the stable and reliable operation of the turbine compressor.

Description

Technical Field

[0001] The invention belongs to the field of turbine compressors, and relates to an inner hole machining device for a turbine compressor casing, and in particular to a large-scale double-speed, double-cutter disc radial feeding device. Background Art

[0002] The casing of a turbine compressor conventionally adopts a horizontal split structure. The horizontal split structure means that the casing has a horizontal center plane, that is, the casing is composed of an upper and lower halves. Its advantage is that this structure is easy to install and measure. The upper and lower casings are positioned with locating pins and connected with bolts. The lower casing is equipped with guide pillars for easy assembly and disassembly. The disadvantage is that it is difficult to process. If the upper and lower bodies are processed separately, misalignment is bound to occur, affecting the assembly and installation accuracy; if the upper and lower bodies are processed at the same time, special tooling needs to be designed. For this purpose, a large-scale dual-speed, dual-disc radial feed device with a length of 6 meters is designed. The existing inner hole processing device of the turbine compressor casing cannot meet the high efficiency and high quality requirements of large casings. The existing device cannot realize the processing of the Φ2300mm inner hole of the casing. Summary of the invention

[0003] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a large-scale dual-speed, dual-disc radial feed device to solve the technical problem that the prior art cannot achieve efficient and high-quality processing of large casings.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions to achieve the above problems:

[0005] A large-scale dual-speed, dual-cutter disc radial feed device comprises a boring bar, wherein the boring bar comprises an integrally arranged feeding front section, a first cutter disc mounting section, a second cutter disc mounting section and a mounting tail section;

[0006] The first cutter disc is fixedly mounted on the first cutter disc mounting section, the second cutter disc is fixedly mounted on the second cutter disc mounting section, the first cutter disc is mounted with a first movable plate capable of radially feeding on the first cutter disc, and the second cutter disc is mounted with a second movable plate capable of radially feeding on the second cutter disc;

[0007] The end surface of the feeding front section of the boring bar is axially inwardly processed with a gear shaft installation cavity, a first worm installation cavity and a second worm installation cavity arranged in parallel, and the boring bar is radially processed with a first worm wheel installation cavity and a second worm wheel installation cavity penetrating the boring bar, the first worm wheel installation cavity is perpendicular to and connected with the first worm installation cavity, and the second worm wheel installation cavity is perpendicular to and connected with the second worm installation cavity;

[0008] A detachable gearbox cover is installed on the end surface of the feeding front section of the boring bar, a gearbox compartment is provided between the gearbox cover and the end surface of the feeding front section of the boring bar, a through gear shaft mounting hole is provided on the end surface of the gearbox cover, and a first gearshift travel groove and a second gearshift travel groove are provided on the side wall of the gearbox cover;

[0009] The gear shaft is rotatably mounted in the gear shaft mounting cavity, the first worm is rotatably mounted in the first worm mounting cavity, the second worm is rotatably mounted in the second worm mounting cavity, the head end of the gear shaft passes through the transmission compartment and the gear shaft mounting hole and extends out of the gearbox cover and is mounted with a feed handwheel, and the head ends of the first worm and the second worm are both rotatably mounted on the end surface of the gearbox cover;

[0010] A high-speed driving gear and a low-speed driving gear are fixedly mounted on the gear shaft in the speed change chamber, and a speed change gear capable of axially sliding on the first worm and the second worm is respectively provided on the first worm and the second worm, and the speed change gear comprises a sliding sleeve mounted on the first worm and the second worm, and a high-speed driven gear matched with the high-speed driving gear and a low-speed driven gear matched with the low-speed driving gear are respectively provided at both ends of the sliding sleeve;

[0011] A shift fork for speed adjustment is installed on the first speed change gear adjustment stroke groove through a shift fork bolt, and the shift fork is clamped on a sliding sleeve between a high-speed driven gear and a low-speed driven gear on the first worm gear; a shift fork for speed adjustment is installed on the second speed change gear adjustment stroke groove through a shift fork bolt, and the shift fork is clamped on a sliding sleeve between a high-speed driven gear and a low-speed driven gear on the second worm gear;

[0012] A first worm wheel capable of rotating in the first worm wheel mounting cavity is installed in the first worm wheel mounting cavity, the first worm wheel cooperates with the first worm, a screw drive threaded hole is provided in the radial center of the first worm wheel, a first screw that matches is installed in the screw drive threaded hole, and the axial rotation of the first worm drives the radial feed movement of the first screw; the radial ends of the first screw respectively pass through the radial ends of the first worm wheel mounting cavity and are respectively installed on the first movable plate, and the radial feed movement of the first screw drives the radial feed of the first movable plate;

[0013] The second worm gear installation cavity is provided with a second worm gear that can rotate in the second worm gear installation cavity, the second worm gear cooperates with the second worm, a screw drive threaded hole is provided in the radial center of the second worm gear, a second screw that matches is installed in the screw drive threaded hole, and the axial rotation of the second worm drives the radial feeding movement of the second screw; the radial ends of the second screw respectively pass through the radial ends of the second worm gear installation cavity and are respectively installed on the second movable plate, and the radial feeding movement of the second screw drives the radial feeding of the second movable plate;

[0014] The present invention also has the following technical features:

[0015] The first cutter disc and the second cutter disc are arranged opposite to each other. A first movable plate is arranged on the outer side of the first cutter disc, and a second movable plate is arranged on the outer side of the second cutter disc.

[0016] A first guard plate fixedly mounted on the boring bar is arranged on the outer side of the first movable plate, and a second guard plate fixedly mounted on the boring bar is arranged on the outer side of the second movable plate.

[0017] The first movable plate and the second movable plate are respectively provided with boring tool mounting seats.

[0018] The first cutter disc and the second cutter disc are both mounted on the boring bar via a cutter disc mounting sleeve seat.

[0019] The first worm gear and the second worm gear have the same structure; the first worm gear comprises an integrally formed meshing portion and a rotation support portion in sequence, the meshing portion cooperates with the first worm, and the two ends of the rotation support portion are respectively provided with a first one-way thrust ball bearing and a second one-way thrust ball bearing, the two ends of the first one-way thrust bearing are respectively pressed against the protruding end surface of the meshing portion and the first boss arranged in the first worm gear mounting cavity, one end of the second one-way thrust bearing is pressed against the second boss arranged in the first worm gear mounting cavity, and the other end of the second one-way thrust bearing is pressed against the nut installed on the rotation support portion.

[0020] The first worm gear installation cavity and the second worm gear installation cavity are both provided with cover plates at their ends close to the meshing portion.

[0021] A first gear shaft rotating bushing is arranged between the gear shaft installation cavity and the gear shaft; and a second gear shaft rotating bushing is arranged between the gear shaft installation hole and the gear shaft.

[0022] The boring bar is also provided with a plurality of supporting sleeves for supporting the first worm and the second worm.

[0023] Axial sliding is achieved between the first worm, the second worm and the speed change gear via an axially arranged guide key and a guide keyway.

[0024] Compared with the prior art, the present invention has the following technical effects:

[0025] (I) The device of the present invention has dual speed adjustment, i.e. two feed speeds and gear shifting, which can ensure high efficiency during rough machining and high quality during fine machining, combining fast and slow speeds.

[0026] (II) The device of the present invention adopts double cutter discs, which can be equipped with a variety of cutter discs of different sizes and strokes, and can be freely combined to achieve various casing inner cavity processing. The movable plate is driven by the lead screw to slide on the cutter disc to achieve radial cutting. By changing the specifications of the cutter disc and the movable plate, the inner hole can be processed to Φ2300 mm and the end face can be processed to Φ1800 mm.

[0027] (III) The device of the present invention is used for the first time in a horizontally sectioned turbine compressor casing, which solves the problem that the inner hole of a large casing cannot be machined, meets the installation accuracy requirements of the inner hole in the design drawings, and ensures the smooth and reliable operation of the turbine compressor.

[0028] (IV) The device of the present invention has a unique structure and an ingenious design, which greatly expands the large-scale boring processing capabilities and solves the processing of the inner holes of the casing of a large turbine compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of the present invention, that is, a schematic diagram of the double cutter disc structure.

[0030] Figure 2 It is a schematic diagram of the worm gear assembly structure of the present invention.

[0031] Figure 3 The internal structure diagram of the boring bar of the present invention is a schematic diagram of a dual-speed structure, namely Figure 2 Schematic diagram of the rotation structure of the AA section.

[0032] Figure 4 It is a schematic diagram of the fork structure of the present invention, that is, Figure 3 Schematic diagram of the BB cross-section structure.

[0033] The meanings of the numbers in the figure are as follows: 1-boring bar, 2-first cutter disc, 3-second cutter disc, 4-first movable plate, 5-second movable plate, 6-gear shaft mounting cavity, 7-first worm mounting cavity, 8-second worm mounting cavity, 9-first worm gear mounting cavity, 10-second worm gear mounting cavity, 11-transmission cover, 12-speed shifting compartment, 13-gear shaft mounting hole, 14-first speed shifting travel groove, 15-second speed shifting travel groove, 16-gear shaft, 17-first worm, 18-second worm, 19-feed hand wheel, 20-high-speed driving gear, 21-low speed driving gear, 22-speed gear, 23-shift fork bolt, 24-shift fork, 25-first worm gear, 26-screw drive threaded hole, 27-first screw, 28-second screw, 29-first guard plate, 30-second guard plate, 31-boring tool mounting seat, 32-cutter head mounting sleeve seat, 33-first one-way thrust ball bearing, 34-second one-way thrust ball bearing, 35-nut, 36-cover plate, 37-first gear shaft rotating bushing, 38-second gear shaft rotating bushing, 39-support sleeve, 40-guide key, 41-guide keyway;

[0034] 101-feed front section, 102-first cutter disc installation section, 103-second cutter disc installation section, 104-installation tail section;

[0035] 901-first boss, 902-second boss;

[0036] 2201-sliding sleeve, 2202-high-speed driven gear, 2203-low-speed driven gear;

[0037] 2501-engaging portion, 2502-rotational support portion.

[0038] The specific contents of the present invention are further explained in detail below in conjunction with embodiments. DETAILED DESCRIPTION

[0039] It should be noted that, unless otherwise specified, all components in the present invention are components known in the prior art.

[0040] In accordance with the above technical scheme, specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical scheme of this application fall within the protection scope of the present invention.

[0041] Example:

[0042] In accordance with the above technical solution, this embodiment provides a large-scale dual-speed, dual-disc radial feeding device, such as Figures 1 to 4 As shown, the boring bar 1 includes a feeding front section 101, a first cutter disc mounting section 102, a second cutter disc mounting section 103 and a mounting tail section 104 which are integrally arranged;

[0043] A first cutter disc 2 is fixedly mounted on the first cutter disc mounting section 102, a second cutter disc 3 is fixedly mounted on the second cutter disc mounting section 103, a first movable plate 4 capable of radially feeding on the first cutter disc 2 is mounted on the first cutter disc 2, and a second movable plate 5 capable of radially feeding on the second cutter disc 3 is mounted on the second cutter disc 3;

[0044] The end surface of the feeding front section 101 of the boring bar 1 is axially inwardly processed with a gear shaft installation cavity 6, a first worm installation cavity 7 and a second worm installation cavity 8 arranged in parallel, and the boring bar 1 is radially processed with a first worm wheel installation cavity 9 and a second worm wheel installation cavity 10 penetrating the boring bar 1, the first worm wheel installation cavity 9 is perpendicular to and connected with the first worm wheel installation cavity 7, and the second worm wheel installation cavity 10 is perpendicular to and connected with the second worm wheel installation cavity 8;

[0045] A detachable gearbox cover 11 is installed on the end surface of the feeding front section 101 of the boring bar 1, and a gearbox compartment 12 is provided between the gearbox cover 11 and the end surface of the feeding front section 101 of the boring bar 1. A through gear shaft mounting hole 13 is provided on the end surface of the gearbox cover 11, and a first gearshift travel groove 14 and a second gearshift travel groove 15 are provided on the side wall of the gearbox cover 11;

[0046] A gear shaft 16 is rotatably mounted in the gear shaft mounting cavity 6, a first worm 17 is rotatably mounted in the first worm mounting cavity 7, and a second worm 18 is rotatably mounted in the second worm mounting cavity 8. The head end of the gear shaft 16 passes through the transmission compartment 12 and the gear shaft mounting hole 13 and extends to the outside of the gearbox cover 11 and is mounted with a feed handwheel 19. The head ends of the first worm 17 and the second worm 18 can be rotatably mounted on the end surface of the gearbox cover 11.

[0047] A high-speed driving gear 20 and a low-speed driving gear 21 are fixedly mounted on the gear shaft 16 in the transmission compartment 12. A speed change gear 22 capable of axially sliding on the first worm 17 and the second worm 18 is respectively provided on the first worm 17 and the second worm 18. The speed change gear 22 includes a sliding sleeve 2201 sleeved on the first worm 17 and the second worm 18. A high-speed driven gear 2202 matched with the high-speed driving gear 20 and a low-speed driven gear 2203 matched with the low-speed driving gear 21 are respectively provided at both ends of the sliding sleeve 2201.

[0048] A shift fork 24 for speed adjustment is installed on the first speed shifting stroke groove 14 through a shift fork bolt 23, and the shift fork 24 is clamped on a sliding sleeve 2201 between a high-speed driven gear 2202 and a low-speed driven gear 2203 on the first worm 17; a shift fork 24 for speed adjustment is installed on the second speed shifting stroke groove 15 through a shift fork bolt 23, and the shift fork 24 is clamped on a sliding sleeve 2201 between a high-speed driven gear 2202 and a low-speed driven gear 2203 on the second worm 18;

[0049] A first worm wheel 25 capable of rotating in the first worm wheel installation cavity 9 is installed in the first worm wheel installation cavity 9. The first worm wheel 25 cooperates with the first worm 17. A screw drive threaded hole 26 is opened in the radial center of the first worm wheel 25. A matching first screw 27 is installed in the screw drive threaded hole 26. The axial rotation of the first worm 17 drives the radial feeding movement of the first screw 27. The radial ends of the first screw 27 respectively pass through the radial ends of the first worm wheel installation cavity 9 and are respectively installed on the first movable plate 4. The radial feeding movement of the first screw 27 drives the radial feeding of the first movable plate 4.

[0050] A second worm wheel capable of rotating in the second worm wheel mounting cavity 10 is installed in the second worm wheel mounting cavity 10, the second worm wheel cooperates with the second worm 18, a screw drive threaded hole is opened in the radial center of the second worm wheel, a matching second screw 28 is installed in the screw drive threaded hole, the axial rotation of the second worm 18 drives the radial feed movement of the second screw 28; the radial ends of the second screw 28 respectively pass through the radial ends of the second worm wheel mounting cavity and are respectively installed on the second movable plate 5, the radial feed movement of the second screw 28 drives the radial feed of the second movable plate 5.

[0051] As a preferred solution of this embodiment, the first cutter disc 2 and the second cutter disc 3 are arranged opposite to each other, and a first movable plate 4 is arranged on the outer side of the first cutter disc 2, and a second movable plate 5 is arranged on the outer side of the second cutter disc 3. Further, a first guard plate 29 fixedly mounted on the boring bar 1 is arranged on the outer side of the first movable plate 4, and a second guard plate 30 fixedly mounted on the boring bar 1 is arranged on the outer side of the second movable plate 5. This facilitates better realization of double-knife operation.

[0052] Specifically, a boring tool mounting seat 31 is respectively provided on the first movable plate 4 and the second movable plate 5. The boring tool mounting seat 31 is used to mount a tool in the boring process.

[0053] As a preferred solution of this embodiment, the first cutter disc 2 and the second cutter disc 3 are both mounted on the boring bar 1 through the cutter disc mounting sleeve seat 32. This makes the first cutter disc 2 and the second cutter disc 3 more stably installed, easy to disassemble and assemble, and easy to process.

[0054] As a preferred solution of this embodiment, the first worm gear 25 and the second worm gear have the same structure; the first worm gear 25 includes an integrally formed meshing portion 2501 and a rotation support portion 2502 in sequence, the meshing portion 2501 cooperates with the first worm 17, and the two ends of the rotation support portion 2502 are respectively provided with a first one-way thrust ball bearing 33 and a second one-way thrust ball bearing 34, and the two ends of the first one-way thrust bearing 33 are respectively pressed against the protruding end surface of the meshing portion 2501 and the first boss 901 set in the first worm gear mounting cavity 9, one end of the second one-way thrust bearing 34 is pressed against the second boss 902 set in the first worm gear mounting cavity 9, and the other end of the second one-way thrust bearing 34 is pressed against the nut 35 installed on the rotation support portion 2502.

[0055] Furthermore, the ends of the first worm gear installation cavity 9 and the second worm gear installation cavity 10 close to the meshing portion are both provided with cover plates 36 to better protect the worm gear and avoid contamination.

[0056] As a preferred solution of this embodiment, a first gear shaft rotating bushing 37 is provided between the gear shaft installation cavity 6 and the gear shaft 16; a second gear shaft rotating bushing 38 is provided between the gear shaft installation hole 13 and the gear shaft 16. The gear shaft 16 can be installed better, so that the gear shaft 16 is more stable during the rotation process.

[0057] As a preferred solution of this embodiment, a plurality of support sleeves 39 for supporting the first worm 17 and the second worm 18 are also provided on the boring bar 1. The first worm 17 and the second worm 18 are better installed, so that the first worm 17 and the second worm 18 are more stable during the rotation process.

[0058] As a preferred solution of this embodiment, the first worm 17, the second worm 18 and the speed change gear 22 are axially slidable by means of an axially arranged guide key 40 and a guide key slot 41. This prevents the speed change gear 22 from rotating around the axial direction during the high and low speed shifting process, and ensures accurate meshing of the driving gear and the driven gear.

[0059] When the large-scale dual-speed, dual-cutting disc radial feed device of the present invention is in use, the mounting tail section 104 of the boring bar 1 is mounted on the boring shaft of the boring machine, and the tool used in the boring process is mounted on the boring tool mounting seat 31 on the first movable plate 4 and the second movable plate 5. Driven by the boring machine, the boring bar 1 rotates to drive the tool to perform boring processing on the workpiece.

[0060] When the radial feed of the tool is adjusted, the feed handwheel 19 provided at the end of the feed front section 101 of the boring bar 1 is turned by the handle, and the feed handwheel 19 drives the gear shaft 16 to rotate. The gear shaft 16 engages with the speed change gear 22 through the high-speed driving gear 20 or the low-speed driving gear 21 to drive the axial rotation of the first worm 17 and / or the second worm 18. The axial rotation of the first worm 17 and / or the second worm 18 drives the radial rotation of the first worm wheel 25 and / or the second worm wheel. The radial rotation of the first worm wheel 25 and / or the second worm wheel is matched with the thread of the first screw rod 27 and / or the second screw rod 28 through the screw driving threaded hole 26, so that the first screw rod 27 and / or the second screw rod 28 can realize radial feeding, thereby driving the radial feeding of the first movable plate 4 and / or the second movable plate 5, thereby realizing radial feeding of the tool.

[0061] The axial movement of the shift fork 24 in the first speed-shifting stroke groove 14 and the second speed-shifting stroke groove 15 drives the speed-shifting gear 22 to move axially on the first worm 17 and the second worm, thereby realizing the meshing of the high-speed driven gear 2202 with the high-speed driving gear 20 for high-speed radial feed adjustment, or the low-speed driven gear 2203 with the core of the low-speed driving gear 21 for low-speed radial feed adjustment, thereby realizing dual-speed adjustment, realizing two different transmission ratios, and thus realizing the feed of the cutter head at two different speeds. Fast feeding during roughing improves work efficiency, and slow feeding during fine processing improves the surface roughness of the workpiece and ensures product quality.

Claims

1. A large-scale dual-speed, dual-disc radial feed device, comprising a boring bar (1), It is characterized in that The boring bar (1) comprises an integrally arranged front feeding section (101), a first cutter disc mounting section (102), a second cutter disc mounting section (103) and a mounting rear section (104); The first cutter disc (2) is fixedly mounted on the first cutter disc mounting section (102), the second cutter disc (3) is fixedly mounted on the second cutter disc mounting section (103), the first cutter disc (2) is mounted with a first movable plate (4) capable of radially feeding on the first cutter disc (2), and the second cutter disc (3) is mounted with a second movable plate (5) capable of radially feeding on the second cutter disc (3); The end surface of the feeding front section (101) of the boring bar (1) is axially inwardly processed with a gear shaft mounting cavity (6), a first worm mounting cavity (7) and a second worm mounting cavity (8) arranged in parallel, and the boring bar (1) is radially processed with a first worm wheel mounting cavity (9) and a second worm wheel mounting cavity (10) penetrating the boring bar (1), the first worm wheel mounting cavity (9) is arranged perpendicularly to and in communication with the first worm wheel mounting cavity (7), and the second worm wheel mounting cavity (10) is arranged perpendicularly to and in communication with the second worm wheel mounting cavity (8); A detachable gearbox cover (11) is installed on the end surface of the feeding front section (101) of the boring bar (1); a gearbox compartment (12) is provided between the gearbox cover (11) and the end surface of the feeding front section (101) of the boring bar (1); a through gear shaft mounting hole (13) is provided on the end surface of the gearbox cover (11); and a first gearshift travel groove (14) and a second gearshift travel groove (15) are provided on the side wall of the gearbox cover (11); A gear shaft (16) is rotatably mounted in the gear shaft mounting cavity (6), a first worm (17) is rotatably mounted in the first worm mounting cavity (7), and a second worm (18) is rotatably mounted in the second worm mounting cavity (8); a head end of the gear shaft (16) passes through the transmission chamber (12) and the gear shaft mounting hole (13), extends out of the transmission cover (11) and is mounted with a feed hand wheel (19); and the head ends of the first worm (17) and the second worm (18) are both rotatably mounted on the end surface of the transmission cover (11); A high-speed driving gear (20) and a low-speed driving gear (21) are fixedly mounted on the gear shaft (16) in the speed change chamber (12); a speed change gear (22) capable of axially sliding on the first worm (17) and the second worm (18) is respectively arranged on the first worm (17) and the second worm (18); the speed change gear (22) comprises a sliding sleeve (2201) sleeved on the first worm (17) and the second worm (18); a high-speed driven gear (2202) matched with the high-speed driving gear (20) and a low-speed driven gear (2203) matched with the low-speed driving gear (21) are respectively arranged at both ends of the sliding sleeve (2201); A shift fork (24) for speed adjustment is mounted on the first speed shifting stroke groove (14) via a shift fork bolt (23), and the shift fork (24) is mounted on a sliding sleeve (2201) between a high-speed driven gear (2202) and a low-speed driven gear (2203) on the first worm gear (17); a shift fork (24) for speed adjustment is mounted on the second speed shifting stroke groove (15) via a shift fork bolt (23), and the shift fork (24) is mounted on a sliding sleeve (2201) between a high-speed driven gear (2202) and a low-speed driven gear (2203) on the second worm gear (18); A first worm wheel (25) capable of rotating in the first worm wheel installation cavity (9) is installed in the first worm wheel installation cavity (9); the first worm wheel (25) cooperates with the first worm (17); a screw drive threaded hole (26) is provided at the radial center of the first worm wheel (25); a first screw (27) that matches the screw drive threaded hole (26) is installed in the screw drive threaded hole (26); the axial rotation of the first worm (17) drives the radial feeding movement of the first screw (27); the radial ends of the first screw (27) respectively pass through the radial ends of the first worm wheel installation cavity (9) and are respectively installed on the first movable plate (4); the radial feeding movement of the first screw (27) drives the radial feeding of the first movable plate (4); A second worm wheel capable of rotating in the second worm wheel mounting cavity (10) is mounted in the second worm wheel mounting cavity (10); the second worm wheel cooperates with the second worm (18); a screw drive threaded hole is provided in the radial center of the second worm wheel; a second screw (28) cooperating therewith is mounted in the screw drive threaded hole; the axial rotation of the second worm (18) drives the radial feed movement of the second screw (28); the radial ends of the second screw (28) respectively pass through the radial ends of the second worm wheel mounting cavity and are respectively mounted on the second movable plate (5); the radial feed movement of the second screw (28) drives the radial feed of the second movable plate (5); The first cutter disc (2) and the second cutter disc (3) are arranged opposite to each other, a first movable plate (4) is arranged on the outer side of the first cutter disc (2), and a second movable plate (5) is arranged on the outer side of the second cutter disc (3); The first movable plate (4) and the second movable plate (5) are respectively provided with a boring tool mounting seat (31).

2. The large-scale dual-speed, dual-disc radial feed device according to claim 1, It is characterized in that A first guard plate (29) fixedly mounted on the boring bar (1) is arranged on the outer side of the first movable plate (4), and a second guard plate (30) fixedly mounted on the boring bar (1) is arranged on the outer side of the second movable plate (5).

3. The large-scale dual-speed, dual-disc radial feed device according to claim 1, It is characterized in that The first cutter disc (2) and the second cutter disc (3) are both mounted on the boring bar (1) via a cutter disc mounting sleeve seat (32).

4. The large-scale dual-speed, dual-disc radial feed device according to claim 1, It is characterized in that The first worm gear (25) and the second worm gear have the same structure; the first worm gear (25) comprises an integrally formed meshing portion (2501) and a rotation support portion (2502) in sequence; the meshing portion (2501) cooperates with the first worm (17); the two ends of the rotation support portion (2502) are respectively provided with a first one-way thrust ball bearing (33) and a second one-way thrust ball bearing (34); the two ends of the first one-way thrust bearing (33) are respectively pressed against the protruding end surface of the meshing portion (2501) and a first boss (901) provided in the first worm gear mounting cavity (9); one end of the second one-way thrust bearing (34) is pressed against the second boss (902) provided in the first worm gear mounting cavity (9); and the other end of the second one-way thrust bearing (34) is pressed against a nut (35) installed on the rotation support portion (2502).

5. The large-scale dual-speed, dual-disc radial feed device as claimed in claim 4, It is characterized in that Cover plates (36) are provided at the ends of the first worm gear installation cavity (9) and the second worm gear installation cavity (10) close to the meshing portion.

6. The large-scale dual-speed, dual-disc radial feed device according to claim 1, It is characterized in that A first gear shaft rotating bushing (37) is provided between the gear shaft mounting cavity (6) and the gear shaft (16); and a second gear shaft rotating bushing (38) is provided between the gear shaft mounting hole (13) and the gear shaft (16).

7. The large-scale dual-speed, dual-disc radial feed device according to claim 1, It is characterized in that The boring bar (1) is also provided with a plurality of support sleeves (39) for supporting the first worm (17) and the second worm (18).

8. The large-scale dual-speed, dual-disc radial feed device according to claim 1, It is characterized in that Axial sliding is achieved between the first worm (17), the second worm (18) and the speed change gear (22) via an axially arranged guide key (40) and a guide keyway (41).

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