CN-115890178-B - Dismounting device and method for engine direct-current generator

CN115890178BCN 115890178 BCN115890178 BCN 115890178BCN-115890178-B

Abstract

The invention discloses a device and a method for dismounting a direct-current generator of an engine, relates to the technical field of maintenance of aero-engines, and aims to improve the dismounting efficiency and quality of the direct-current generator. The technical scheme includes that the dismounting device of the direct-current generator of the engine comprises a pressing plate, a switching rod, bolts and a sleeve, wherein a circular central hole is formed in the pressing plate, the switching rod is placed in the central hole and consists of an upper section and a lower section, the upper section is located in the central hole and is in clearance fit with the central hole, the outer diameter of the lower section is larger than the diameter of the central hole, a spanner connecting structure is arranged at the top end of the upper section, at least three claw heads are arranged at the bottom end of the lower section along the circumferential direction, at least three fixing holes are formed in the circular shape taking the central hole as the center of a circle, and at least three fixing holes are respectively provided with one bolt and are connected with the sleeve. The invention is used for disassembling and installing the fixing screw cap of the direct current generator, is also used for disassembling and installing the graphite sealing device, and has the characteristics of convenience and rapidness in disassembly, safety and reliability.

Inventors

ZHONG JIE
TANG SHENG
PENG HONGMEI
YI KUN
CHEN QINGJUN
HUANG SHAOHUA
TAN GUANGYI
PEI PEI
LIU HUAQING
CUI SHIWEI
GAO YAPENG
Du Ailei

Assignees

国营川西机器厂

Dates

Publication Date: 20260505
Application Date: 20221118

Claims (9)

1. The dismounting device of the engine direct-current generator is characterized by comprising a pressing plate (1), an adapter rod (2), bolts (3) and sleeves (4), wherein a circular center hole is formed in the pressing plate (1), the adapter rod (2) is placed in the center hole, the adapter rod (2) consists of an upper section and a lower section, the upper section is positioned in the center hole and is in clearance fit with the center hole, the outer diameter of the lower section is larger than the diameter of the center hole, a spanner connecting structure is arranged at the top end of the upper section, at least three claw heads (21) are arranged at the bottom end of the lower section along the circumferential direction, at least three fixing holes are formed in the circle with the center hole as the center of a circle, one bolt (3) is respectively arranged in the at least three fixing holes, each bolt (3) is respectively provided with one sleeve (4), the lengths of each sleeve (4) are equal, the two ends of each sleeve (4) are respectively provided with internal threads, and the bolts (3) are in fit with the internal threads at one end of each sleeve (4).
2. The assembling and disassembling device for the direct-current generator of the engine, as set forth in claim 1, is characterized in that the pressing plate (1) is circular, six fixing holes are formed in the pressing plate (1), and the angles of the central angles formed by any two adjacent fixing holes and the central hole are equal.
3. The assembly and disassembly device for the direct-current generator of the engine, as set forth in claim 1, is characterized in that the number of the claw heads (21) at the bottom end of the adapter rod (2) is four, and the central angle formed by any two adjacent claw heads (21) and the center of the bottom end is a right angle.
4. The assembly and disassembly device for the direct-current generator of the engine, as set forth in claim 1, is characterized in that the pressing plate (1), the switching rod (2), the bolt (3) and the sleeve (4) are all made of 45 # steel.
5. The assembly and disassembly device for the direct-current generator of the engine, as set forth in any one of claims 1 to 4, is characterized in that the wrench connecting structure is that a connecting hole (22) is formed in the top end of the connecting rod (2), the center line of the connecting hole (22) coincides with the center line of the connecting rod (2), and the connecting hole (22) is in a regular quadrangular shape.
6. The assembly and disassembly device for the direct-current generator of the engine, as set forth in claim 5, is characterized in that a through hole is arranged between the center of the top end and the center of the bottom end of the adapter rod (2), a section of the through hole close to the top end is in a regular quadrangular prism shape and is an adapter hole (22), a section of the through hole close to the bottom end is in a cylindrical shape, and the diameter of the cylinder is larger than the diagonal length of a square corresponding to the regular quadrangular prism.
7. The assembly and disassembly device of the direct-current generator of the engine, as set forth in claim 6, characterized in that a positioning tube (5) is arranged in a through hole at the bottom end of the transfer rod (2), the positioning tube (5) is composed of an upper section and a lower section, the outer diameter of the upper section is smaller than that of the lower section, and the outer diameter of the upper section is matched with the diameter of the cylindrical positioning tube (5).
8. A disassembly and assembly method of an engine direct current generator is characterized in that a fixing nut of the direct current generator is disassembled or assembled through the disassembly and assembly device of the engine direct current generator, which is characterized in that one end of a sleeve (4) is connected with a screw rod (6) around the direct current generator in a threaded mode, a claw head (21) of a conversion rod (2) is placed into a clamping groove of the fixing nut, a pressing plate is moved, a central hole of the pressing plate is located at a hanging table formed by the upper section and the lower section of the conversion rod (2), the pressing plate is rotated again, the fixing hole is aligned with the sleeve (4), one end of the sleeve (4) is fixedly connected with the pressing plate through a bolt (3), and finally, a spanner is matched with a spanner connecting structure at the top end of the conversion rod (2), and disassembly or assembly of the fixing nut is achieved through rotating the spanner.
9. The method for assembling and disassembling the direct-current generator of the engine, as set forth in claim 8, characterized in that before the claw head (21) of the adapter rod (2) is placed in the clamping groove of the fixing nut, the lower section of the positioning tube (5) is placed in the hole in the middle of the fixing nut, then the upper section of the positioning tube (5) is inserted into the through hole at the bottom end of the adapter rod (2), and meanwhile the claw head (21) at the bottom end of the adapter rod (2) is placed in the clamping groove of the fixing nut.

Description

Dismounting device and method for engine direct-current generator Technical Field The invention relates to the technical field of aero-engine maintenance, in particular to a device and a method for disassembling and assembling a direct-current generator on an engine. Background After the engine is started, in the flying process, the direct-current generator converts mechanical energy into electric energy to supply power to electric equipment of the aircraft, and meanwhile, the storage battery is charged. When the aircraft starts, the direct-current generator is powered by the storage battery and used as a motor to drive the engine to rise, and when the rotation speed of the engine reaches a certain specific rotation speed, the engine is ignited to work, so the direct-current generator is also a starter and is an important device for the engine. The direct current generator is connected with the aircraft accessory case, the connecting and combining surface is a graphite sealing device, and the lubricating oil sealing effect is achieved by utilizing the contact of the graphite ring and the rotor. The graphite sealing device is likely to generate the problems of incomplete assembly, concentricity deviation and the like in use, so that oil leakage is caused at the joint part, and the oil leakage directly causes the problems of reduced lubrication effect, reduced internal pressure, increased lubrication oil consumption and the like of the engine. After the failure occurs, a maintenance crew needs to detach a fixing nut of the direct-current generator, replace or repair the graphite sealing device, and reinstall the direct-current generator after the failure is removed. At present, the operation of troubleshooting needs two people to mutually cooperate, one person ensures that the rotation axis of the wrench is perpendicular to the corresponding plane of the fixed nut of the direct current generator, and the other person applies torque to the wrench. Because the rotation axis of spanner and the corresponding plane of DC generator's fixation nut are difficult to maintain relative fixed, DC generator's dismouting appears skidding easily, damage the engine even, and the installation leads to graphite sealing device to appear the deviation easily, not only reduces maintenance efficiency, and more importantly influences maintenance quality, appears DC generator oil leak trouble easily. Disclosure of Invention The invention firstly provides a disassembly and assembly device for an engine direct-current generator, and aims to improve the disassembly and assembly efficiency and quality of the direct-current generator. The technical scheme includes that the dismounting device of the direct-current generator of the engine comprises a pressing plate, a switching rod, bolts and sleeves, wherein a circular central hole is formed in the pressing plate, the switching rod is placed in the central hole and consists of an upper section and a lower section, the upper section is located in the central hole and is in clearance fit with the central hole, the outer diameter of the lower section is larger than the diameter of the central hole, a spanner connecting structure is arranged at the top end of the upper section, at least three claw heads are arranged at the bottom end of the lower section along the circumferential direction, at least three fixing holes are formed in the circular shape taking the central hole as the center of a circle, a bolt is arranged in each of the at least three fixing holes, each bolt is provided with a sleeve respectively, the lengths of the sleeves are equal, internal threads are respectively arranged at two ends of each sleeve, and the bolts are in fit with the internal threads of one end of each sleeve and are in threaded connection. The pressing plate is circular, six fixing holes are formed in the pressing plate, and the angles of the central angles formed by any two adjacent fixing holes and the central hole are equal. The number of the claw heads at the bottom end of the transfer rod is four, and the central angle formed by any two adjacent claw heads and the center of the bottom end is a right angle. Specifically, the materials of the pressing plate, the switching rod, the bolt and the sleeve are all 45 # steel. The wrench connecting structure is characterized in that the top end of the connecting rod is provided with a connecting hole, the central line of the connecting hole is coincident with the central line of the connecting rod, and the connecting rod is in a Kong Chengzheng quadrangular shape. Further, a through hole is arranged between the center of the top end of the adapter rod and the center of the bottom end, one section of the through hole close to the top end is in a regular quadrangular shape and is an adapter hole, one section of the through hole close to the bottom end is in a cylindrical shape, and the diameter of the cylinder is larger than the diagonal length of a square corres