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CN-121847847-B - Drilling jig for processing steam balance hole of steam turbine rotor

CN121847847BCN 121847847 BCN121847847 BCN 121847847BCN-121847847-B

Abstract

The invention belongs to the technical field of steam turbine rotor machining, in particular to a drill jig for steam turbine rotor steam balance hole machining, which comprises a drill jig body, a bushing, a quick-change drill sleeve, a cylindrical pin and a set screw, wherein the drill jig body is provided with a drill hole; the drilling jig comprises a jig body, wherein a rectangular groove is formed in the thickness direction of the jig body, through holes are formed in two sides of the bottom of the jig body, a bushing is fixedly connected to the inside of the through hole on one side of the bushing, and a quick-change drill sleeve is arranged in the bushing. The drilling jig with the gate-shaped structure is matched with the rectangular groove, the preliminary positioning of the drilling jig at the edge of the impeller can be realized rapidly, the radial limiting is carried out on the outer circle of the impeller by matching with cylindrical pins which are symmetrically distributed, the accurate alignment of the circle center of the quick-change drilling jig and the positioning line is ensured, the problem of hole site deviation caused by positioning deviation in the traditional machining is avoided, meanwhile, the fastening screw at the bottom can be stably pressed on the spoke surface of the impeller through threaded connection, so that the drilling jig is kept stable in the drilling process, and the displacement caused by vibration is prevented.

Inventors

  • CHEN ZHIQIANG
  • CHEN PEIJUAN
  • YU BAOJUN
  • Guan Tiangege
  • QI HUIBIN

Assignees

  • 黑龙江华强动力有限公司

Dates

Publication Date
20260508
Application Date
20260317

Claims (6)

  1. 1. The drill jig for processing the steam balance hole of the steam turbine rotor is characterized by comprising a drill die body (1), a bushing (2), a quick-change drill sleeve (3), a cylindrical pin (4) and a fastening piece (5); Rectangular grooves are formed in the thickness direction of the drilling jig body (1), and through holes (6) are formed in two sides of the bottom of the drilling jig body (1); The bushing (2) is fixedly connected to the inside of the through hole (6) at one side, and a quick-change drill sleeve (3) is arranged in the bushing (2); the cylindrical pins (4) are arranged at two positions and are positioned at the top of the drilling die body (1); the fastening pieces (5) are arranged at two sides and are positioned at one side of the bottom of the drilling die body (1), and the fastening pieces (5) penetrate through the side wall of the drilling die body (1) and are detachably connected with the side wall of the drilling die body; the drilling jig comprises a plurality of drilling jig bodies (1), wherein two sides of each drilling jig body (1) are fixedly connected with a matching sleeve (7) and a matching column (8) respectively, and the end part of each matching column (8) is fixedly connected with a guide block (9); The drilling jig further comprises two mounting ring seats (11), wherein the two mounting ring seats (11) are arranged on two sides of the group of drilling jig bodies (1), annular grooves (12) are formed in the peripheries of the mounting ring seats (11), movable seats (13) are connected inside the annular grooves (12) in a sliding mode, the movable seats (13) are fixedly connected with one of the drilling jig bodies (1) through supporting arms (14), reinforcing members (15) are arranged on the surfaces of the movable seats (13), and the reinforcing members (15) penetrate through the movable seats (13) and are detachably connected with the movable seats; A supporting plate (20) is fixedly connected to the bottom of one drilling jig body (1) close to the mounting ring seat (11), an arc-shaped guide rail (21) is fixedly connected to the surface of the supporting plate (20), a centering plate (22) is connected to the surface of the guide rail (21) in a sliding mode, a pressing piece (23) is arranged between the centering plate (22) and the guide rail (21), a line drawing assembly is arranged on the surface of the centering plate (22), and the line drawing assembly is used for drawing locating lines of balance holes on the surface of the impeller; the surface of the supporting plate (20) is also fixedly connected with an arc-shaped indication strip (24), the surface of the indication strip (24) is provided with scale values, and one end, close to the indication strip (24), of the centering plate (22) is fixedly connected with a pointer (25).
  2. 2. The jig for processing steam balance holes of steam turbine rotor according to claim 1, wherein a dovetail groove (10) is formed on one side of the matching sleeve (7).
  3. 3. The jig for machining steam balance holes of a steam turbine rotor according to claim 1, wherein the mounting ring bases (11) are designed as a half-split structure, and the pair of half mounting ring bases (11) are detachably connected.
  4. 4. The drill jig for processing the steam balance hole of the steam turbine rotor according to claim 1 is characterized in that a sliding plate (16) is connected to the top of the drill jig body (1) in a sliding mode, a cylindrical pin (4) is located inside the sliding plate (16), an adjusting column (17) is connected to the top of the sliding plate (16) in a rotating mode, and the adjusting column (17) penetrates through the top of the drill jig body (1) and is detachably connected with the top of the drill jig body.
  5. 5. The jig for processing the steam balance hole of the steam turbine rotor according to claim 4 is characterized in that a pin shaft (18) is fixedly connected inside the cylindrical pin (4), guide grooves (19) are formed in two sides of the jig body (1), two ends of the pin shaft (18) penetrate through the sliding plate (16) and the guide grooves (19), and the pin shaft (18) is rotatably connected with the sliding plate (16).
  6. 6. The drill jig for processing the steam balance hole of the steam turbine rotor according to claim 1, wherein the line drawing assembly comprises a line drawing plate (26), a spring is fixedly connected between the line drawing plate (26) and a centering plate (22), one side of the line drawing plate (26) is fixedly connected with a push rod (27), the push rod (27) is in sliding connection with the centering plate (22), an X-shaped dyeing strip (28) is arranged on the other side of the line drawing plate (26), and the surface of the dyeing strip (28) is coated with a coloring agent.

Description

Drilling jig for processing steam balance hole of steam turbine rotor Technical Field The invention belongs to the technical field of processing of steam turbine rotors, and particularly relates to a drill jig for processing a steam balance hole of a steam turbine rotor. Background The turbine rotor is a turbine core component and mainly used for converting heat energy of steam into mechanical energy. The steam balance hole is arranged on the turbine rotor impeller, and the main function of the steam balance hole is to reduce the steam pressure difference at two sides of the impeller, thereby reducing the overlarge axial force generated by the rotor. The impellers of different stages of a turbine rotor are generally uniformly distributed with 5-7 steam balance holes with the diameter of more than 50 mm on the same pitch circle. A patent of China patent application CN102941370A discloses a steam balance hole machining method of a steam turbine rotor impeller, which is technically characterized in that a drill bit is aligned to a steam balance hole to be machined of a first rotor impeller to be machined, a steam balance hole drill jig is installed, the steam balance holes of the rotor impeller are machined until machining of all the steam balance holes of the rotor impeller to be machined, which are achieved by the travel of the drill bit, are started, a connecting rod is installed between the drill bit and a tail handle, machining of the steam balance holes of the rest rotor impellers to be machined is continuously completed, and a turning drill is withdrawn to align the drill bit to the steam balance hole to be machined of the next rotor impeller to be machined until machining of all the steam balance holes of the rotor impeller to be machined is completed. The technology is suitable for processing the steam balance hole of the rotor impeller. However, the technology has the following defects that as the steam balance holes are formed in the impeller spokes, and the impeller spokes are curved, the impeller spokes are easy to deflect during drilling, so that the steam balance holes of the impeller at the later stage generate larger deflection, and the processing quality of the steam balance holes is poor. Therefore, the invention provides a drill jig for processing a steam balance hole of a steam turbine rotor. Disclosure of Invention In order to overcome the deficiencies of the prior art, at least one technical problem presented in the background art is solved. The invention solves the technical problems by adopting the technical scheme that the drill jig for processing the steam balance hole of the steam turbine rotor comprises a drill jig body, a bushing, a quick-change drill sleeve, a cylindrical pin and a fastening piece; The drilling jig body is provided with a rectangular groove in the thickness direction, and two sides of the bottom of the drilling jig body are provided with through holes; the bushing is fixedly connected in the through hole at one side of the bushing, and a quick-change drill sleeve is arranged in the bushing; the cylindrical pins are arranged in two and are positioned at the top of the drilling jig body; The two fastening pieces are arranged on one side of the bottom of the drill jig body, and penetrate through the side wall of the drill jig body and are connected with the drill jig body through threads. Preferably, the drill jig bodies are provided with a group, two sides of each drill jig body are respectively and fixedly connected with a matching sleeve and a matching column, and the end parts of the matching columns are fixedly connected with guide blocks. Preferably, a dovetail groove is formed in one side of the matching sleeve. The drilling jig comprises a group of drilling jig bodies, and is characterized by further comprising two mounting ring seats, wherein the two mounting ring seats are arranged on two sides of the group of drilling jig bodies, an annular groove is formed in the periphery of each mounting ring seat, a movable seat is connected inside the annular groove in a sliding mode, the movable seat is fixedly connected with one of the drilling jig bodies through a supporting arm, a reinforcing member is arranged on the surface of each movable seat, and penetrates through the movable seat and is connected with the movable seat through threads. Preferably, the mounting ring seat is designed into a half-split structure, and the pair of half mounting ring seats are spliced and fixed through bolts. The drill jig is characterized in that the top of the drill jig body is slidably connected with a sliding plate, a cylindrical pin is positioned in the sliding plate, an adjusting column is rotatably connected to the top of the sliding plate, and the adjusting column penetrates through the top of the drill jig body and is connected with the top of the drill jig body through threads. The pin shaft is fixedly connected with the inside of the cylindrical pin, guide grooves are