CN112696462A - Gear transmission device for pipeline cutting equipment - Google Patents
Gear transmission device for pipeline cutting equipment Download PDFInfo
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- CN112696462A CN112696462A CN202011536716.5A CN202011536716A CN112696462A CN 112696462 A CN112696462 A CN 112696462A CN 202011536716 A CN202011536716 A CN 202011536716A CN 112696462 A CN112696462 A CN 112696462A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Abstract
The invention discloses a gear transmission device for pipeline cutting equipment, which comprises a hydraulic motor, a gear reduction mechanism and an adjusting lifting mechanism, wherein a rigid sleeve is installed at the output end of the hydraulic motor, a coupler and a square shaft are installed in the rigid sleeve, and an output shaft of the hydraulic motor drives the square shaft to rotate through the coupler; the gear reduction mechanism comprises a shell, a worm gear shaft is arranged at the upper part in the shell, a worm gear is arranged on the worm gear shaft, a worm meshed with the worm gear is arranged at the lower part in the shell, and the worm is coaxially connected with a square shaft; the adjusting lifting mechanism comprises a guide lubricating sleeve arranged at the four corners of the lower box body, a guide rod is installed in the guide lubricating sleeve, a buffer spring is sleeved on the lower portion of the guide rod, and a spiral lifter is installed on the left side of the lower box body. The invention has compact structure, convenient disassembly and assembly, safety and reliability, stable transmission, high precision, good torsion resistance and long service life, and ensures the quality of the cutting and beveling of the pipeline cutting equipment.
Description
Technical Field
The invention belongs to the technical field of gear transmission, and particularly relates to a gear transmission device for pipeline cutting equipment.
Background
The pipeline is used as a main carrier of the energy transmission system, and the safe use of the pipeline is the key for ensuring the stable transmission and operation of energy. With the rapid development of economy in recent years, the speed of energy chemical production construction and urbanization construction in China is continuously accelerated, and the production and manufacturing industries of pipe fittings are unprecedentedly developed, so that the demand of the pipe fittings is continuously increased. However, during the use of the pipeline, leakage of the pipeline is often caused due to the problem of low laying quality, and the position which is most likely to cause leakage is the switching position of the pipe fittings, namely the welding position. Once a leak occurs, it not only causes difficulty in inspection and maintenance of the leak point, but also causes waste of resources and environmental pollution. Just so, national standard stipulates that when the nominal wall thickness of pipe fitting is more than or equal to 3 mm, except that need carry out the groove to the terminal surface of pipe fitting in the cutting of pipe fitting before the welding, the welding quality between assurance pipe fitting that like this can be better.
Climbing tubular cutting bevelling machine is the professional equipment in the pipe fitting cutting bevelling course of working, and current climbing tubular cutting bevelling machine product efficiency is still relatively low, and degree of automation is not high, needs manual operation start fixture to press from both sides tight back, begins processing, waits to process after, needs manual operation mobile device again, constantly repeats this process. Therefore, the processing difficulty is greatly increased, the labor cost is also increased, and the processing efficiency is also greatly reduced. The key device of the climbing pipe type cutting beveling machine is a gear transmission device which drives a cutter head to cut a pipeline, so that the key point of how to produce high-precision pipeline cutting equipment lies in the development of the gear transmission device.
Disclosure of Invention
Based on the defects of the prior art, the invention aims to provide the gear transmission device for the pipeline cutting equipment, which can realize stable transmission dual performance and meet the requirements of high-precision cutting and beveling of pipelines.
In order to achieve the purpose, the invention adopts the technical scheme that:
a gear transmission device for pipeline cutting equipment comprises a hydraulic motor, a gear reduction mechanism and an adjusting lifting mechanism, wherein a rigid sleeve is mounted at the output end of the hydraulic motor, a coupler and a square shaft are mounted in the rigid sleeve, and an output shaft of the hydraulic motor drives the square shaft to rotate through the coupler;
the gear reduction mechanism comprises a shell, and the shell comprises an upper box body and a lower box body which are integrally formed; worm wheel end covers are mounted on the front side and the rear side of the upper box body, a worm wheel shaft is mounted in the upper box body along the front-rear direction, a worm wheel is mounted on the rear portion of the worm wheel shaft, and the front portion of the worm wheel shaft extends forwards out of the upper box body; the left side of the lower box body is provided with a worm gland, the right side of the lower box body is fixedly connected with the rigid sleeve, a worm is arranged in the lower box body along the left-right direction, the worm is meshed with the worm wheel, and the right end of the worm is coaxially connected with the square shaft;
the adjusting lifting mechanism comprises a guide lubricating sleeve arranged at four corners of the lower box body, the guide lubricating sleeve extends along the vertical direction, a guide rod is arranged in the guide lubricating sleeve, a buffer spring is sleeved at the lower part of the guide rod, and the top of the buffer spring is abutted with the bottom of the guide lubricating sleeve; and a spiral elevator for adjusting the gear reduction mechanism to move up and down is arranged on the left side of the lower box body.
Preferably, the top of the upper box body is provided with an oil filling hole, and the bottom of the lower box body is provided with an oil unloading hole.
Preferably, a first bearing is installed at the rear part of the worm wheel shaft, a second bearing is installed in the middle of the worm wheel shaft, the second bearing and the first bearing are respectively located on the front side and the rear side of the worm wheel, and the worm wheel shaft is rotatably connected with the upper box body through the first bearing and the second bearing; the front side of the second bearing is provided with a first lip-shaped oil seal which is arranged between the worm wheel shaft and the upper box body.
Further, a first round nut is arranged on the rear side of the first bearing, the first round nut is mounted on a worm gear shaft, a first round nut retaining washer matched with the first round nut is mounted on the worm gear shaft, the first round nut retaining washer is abutted to the rear side face of the first bearing, and the outer edge of the rear side face of the first bearing is abutted to the inner side wall of the upper box body; a first hole check ring is arranged in the upper box body and is abutted against the front side surface of the first bearing; and the upper box body is also internally provided with a first hole elastic check ring, and the first hole elastic check ring is abutted against the front side surface of the second bearing.
Preferably, a third bearing is installed at the left end of the worm, and the worm is in rotary connection with the worm gland through the third bearing; the left part of the worm is provided with a fourth bearing, the fourth bearing is positioned on the right side of the third bearing, the right part of the worm is provided with a fifth bearing, and the worm is rotatably connected with the lower box body through the fourth bearing and the fifth bearing; a second lip-shaped oil seal is arranged between the right end of the worm and the inner wall of the lower box body.
Further, a second round nut is arranged on the left side of the fourth bearing, the second round nut is mounted on a worm, a second round nut backstop washer matched with the second round nut is mounted on the worm, the second round nut backstop washer is abutted against the left side face of the fourth bearing, a second hole check ring is mounted in the lower box body, the second hole check ring is abutted against the left side face of the fourth bearing, and the right side of the fourth bearing is abutted against the inner side wall of the lower box body; and a shaft check ring is sleeved at the right part of the worm and is abutted against the right side surface of the fifth bearing, and the left side of the fifth bearing is abutted against the inner side wall of the lower box body.
Preferably, a first O-shaped sealing ring is arranged between the worm wheel end cover positioned at the rear side and the upper box body; and a second O-shaped sealing ring is arranged between the worm gland and the lower box body.
Preferably, the square shaft is inserted into the right end of the worm so as to realize the linkage of the square shaft and the worm.
Preferably, the worm wheel is keyed to the worm wheel shaft.
Preferably, a second circlip for hole is installed in the guide lubrication sleeve.
The gear reduction mechanism adopts worm and gear transmission to realize the conversion from high rotating speed small torque to low rotating speed large torque, thereby reducing power sources and saving cost; the worm wheel shaft and the worm are accurately axially positioned, the concentricity is good, the lubrication is good, the stable transmission of the worm wheel and the worm is ensured, and the service life is prolonged; the hydraulic motor is connected with the gear reduction mechanism into a whole through the rigid sleeve, the adjusting lifting mechanism takes the guide lubricating sleeve and the guide rod as the guide, and the lifting of the gear reduction mechanism is adjusted through the thread pair (the spiral lifter). All parts of the gear transmission device are in modular design, so that the gear transmission device is compact in structure, convenient to disassemble and install, safe and reliable; the pipe cutter can be used as an actuating mechanism for power cutting of various creeping pipe cutters, has stable transmission and high precision, ensures the quality of cutting and beveling, and has good torsion resistance and long service life.
Drawings
FIG. 1 is a schematic view of a gear assembly according to the present invention;
FIG. 2 is a front view of FIG. 1;
FIG. 3 is a bottom view of FIG. 1;
FIG. 4 is a cross-sectional view taken along A-A of FIG. 3;
FIG. 5 is a schematic structural view of the gear reduction mechanism of FIG. 1;
FIG. 6 is a top view of FIG. 5;
FIG. 7 is a cross-sectional view taken along line B-B of FIG. 6;
fig. 8 is a cross-sectional view taken along line C-C of fig. 6.
Detailed Description
In order to make the technical purpose, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention are further described with reference to specific examples, which are intended to explain the present invention and are not to be construed as limiting the present invention, and those who do not specify a specific technique or condition in the examples follow the techniques or conditions described in the literature in the art or follow the product specification.
In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
As shown in figures 1-8, a gear transmission device for pipeline cutting equipment, including hydraulic motor 5, gear reduction mechanism 3 and regulation elevating system, rigid sleeve 4 is installed to hydraulic motor 5's output, installs rigid coupling 7 and square shaft 6 in proper order from the right side to the left side in the rigid sleeve 4, square shaft 6 extends along the left right direction, hydraulic motor 5's output shaft stretches out to the left, and hydraulic motor 5's output shaft passes through rigid coupling 7 drive square shaft 6 and rotates.
The gear reduction mechanism 3 comprises a casing 301, the casing 301 is made of aviation aluminum materials, the structure is light, the strength is guaranteed, and the heat dissipation performance is good. The casing 301 comprises an upper box body and a lower box body which are integrally formed, an oil filling hole 302 is formed in the top of the upper box body, an oil discharging hole 308 is formed in the bottom of the lower box body, the gear speed reducing mechanism 3 is lubricated and cooled by oil, and the service life of the device is prolonged.
Worm wheel end covers 323 are arranged on the front side and the rear side of the upper box body, and a first O-shaped sealing ring 325 is arranged between the worm wheel end cover 323 on the rear side and the upper box body. The upper box body is internally provided with a worm wheel shaft 324 along the front-back direction, the rear part of the worm wheel shaft 324 is provided with a worm wheel 303 through a key, and the front part of the worm wheel shaft 324 extends forwards out of the upper box body to be used as the output end of the gear transmission mechanism. A first bearing 320 is arranged at the rear part of the worm wheel shaft 324, the first bearing 320 is positioned at the rear side of the worm wheel 303, a first round nut 322 is arranged at the rear side of the first bearing 320, the first round nut 322 is arranged on the worm wheel shaft 324, a first round nut retaining washer 321 matched with the first round nut 322 is arranged on the worm wheel shaft 324, the first round nut retaining washer 321 is abutted against the rear side surface of the first bearing 320, and the outer edge of the rear side surface of the first bearing 320 is abutted against the inner side wall of the upper box body; a first hole retainer ring 319 is installed in the upper box body, and the first hole retainer ring 319 abuts against the front side surface of the first bearing 320; the first bearing 320 is axially positioned by a first hole retainer 319, and a worm wheel shaft 324 is fixed by a first round nut 322 and a first round nut retaining washer 321. Two second bearings 318 are installed in the middle of the worm wheel shaft 324, the second bearings 318 are located on the front side of the worm wheel 303, a first circlip for hole 326 is further installed in the upper box body, the first circlip for hole 326 abuts against the front side face of the second bearing 318 located on the front side, and the second bearings 318 are fixed in the upper box body through the first circlip for hole 326 to prevent the second bearings 318 from moving axially. The worm wheel shaft 324 is rotatably connected with the upper box body through the first bearing 320 and the second bearing 318, and the first round nut 322, the first round nut retaining washer 321, the first hole retainer ring 319 and the first hole retainer ring 326 ensure accurate axial positioning and good concentricity of the worm wheel shaft 324. The front side of the second bearing 318 is also provided with a first lip oil seal 317, the first lip oil seal 317 is installed between the worm wheel shaft 324 and the upper case, and a worm wheel end cover 323 at the front side presses the front end of the first lip oil seal 317.
The left side of the lower box body is provided with a worm gland 316, the worm gland 316 is installed through a jackscrew so as to be convenient to disassemble, and a second O-shaped sealing ring 310 is installed between the worm gland 316 and the lower box body. The right side and the rigid sleeve 4 fastening connection of lower box, install worm 304 along the left and right direction in the lower box, worm 304 meshes with worm wheel 303 mutually, the right-hand member of worm 304 is inserted to square shaft 6 to realize the linkage of square shaft 6 and worm 304. The left end of the worm 304 is provided with a third bearing 313, and the worm 304 is in rotary connection with a worm gland 316 through the third bearing 313; the left part of the worm 304 is provided with a fourth bearing 309, the fourth bearing 309 is positioned at the right side of the third bearing 313, the right part of the worm 304 is provided with a fifth bearing 307, and the worm 304 is rotatably connected with the lower box body through the fourth bearing 309 and the fifth bearing 307. A second round nut is arranged on the left side of the fourth bearing 309 and is mounted on the worm 304, a second round nut retaining washer 312 matched with the second round nut is mounted on the worm 304, the second round nut retaining washer 312 is abutted against the left side surface of the fourth bearing 309, a second hole retainer ring 311 is mounted in the lower box body, the second hole retainer ring 311 is abutted against the outer edge of the left side surface of the fourth bearing 309, and the right side of the fourth bearing 309 is abutted against the inner side wall of the lower box body; the worm 304 is sleeved with a shaft retainer 306 at the right part, the shaft retainer 306 abuts against the right side surface of a fifth bearing 307, the left side of the fifth bearing 307 abuts against the inner side wall of the lower case, and the fifth bearing 307 is axially positioned through the shaft retainer 306. Two second lip oil seals 305 which are arranged back to back are arranged between the right end of the worm 304 and the inner wall of the lower box body, and the left end of the rigid sleeve 4 is pressed against the right end of the second lip oil seals 305.
The adjusting lifting mechanism comprises guide lubricating sleeves 314 arranged at four corners of the lower box body, the guide lubricating sleeves 314 extend in the vertical direction, the guide lubricating sleeves 314 and the machine shell 301 are integrally formed, second hole elastic retainer rings 315 are installed in the guide lubricating sleeves 314, and guide rods 2 are inserted in the guide lubricating sleeves; the lower part of the guide rod 2 is sleeved with a buffer spring 8, the buffer spring 8 is a compression spring, and the top of the buffer spring 8 is in abutting connection with the bottom of the guide lubricating sleeve 314; the buffer spring 8 plays a role in buffering and damping, and particularly plays a great role in protecting the cutter in the process from the contact of the cutter with the steel pipe to the penetration of the steel pipe. The left side of the lower box body is provided with a spiral lifter 1 used for adjusting the gear speed reducing mechanism 3 to move up and down, the spiral lifter 1 adopts the conventional thread pair design in the field, the stable lifting is ensured, and meanwhile, the self-locking function is realized, which is not the innovation of the invention, so the details are not repeated.
The gear transmission device is ingenious in structural design, flexible in movement, and convenient to assemble, disassemble and transport, and all parts can be detachably connected. When the pipeline cutting device is used, the up-down position is adjusted through the spiral lifter 1, the hydraulic motor 5 is used as a power source, the worm 304 is driven to rotate through the rigid coupling 7 and the square shaft 6, the worm 304 is transmitted to the worm wheel 303, the worm wheel 303 drives the worm wheel shaft 324 to rotate, and finally the front end of the worm wheel shaft 324 is used as an output end and serves as an execution mechanism for power cutting of pipeline cutting equipment to drive a cutter to cut.
The foregoing embodiments and description have been provided merely to illustrate the principles of the invention and various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A gear assembly for a pipe cutting apparatus, comprising: the hydraulic lifting device comprises a hydraulic motor, a gear reduction mechanism and an adjusting lifting mechanism, wherein a rigid sleeve is arranged at the output end of the hydraulic motor, a coupler and a square shaft are arranged in the rigid sleeve, and an output shaft of the hydraulic motor drives the square shaft to rotate through the coupler;
the gear reduction mechanism comprises a shell, and the shell comprises an upper box body and a lower box body which are integrally formed; worm wheel end covers are mounted on the front side and the rear side of the upper box body, a worm wheel shaft is mounted in the upper box body along the front-rear direction, a worm wheel is mounted on the rear portion of the worm wheel shaft, and the front portion of the worm wheel shaft extends forwards out of the upper box body; the left side of the lower box body is provided with a worm gland, the right side of the lower box body is fixedly connected with the rigid sleeve, a worm is arranged in the lower box body along the left-right direction, the worm is meshed with the worm wheel, and the right end of the worm is coaxially connected with the square shaft;
the adjusting lifting mechanism comprises a guide lubricating sleeve arranged at four corners of the lower box body, the guide lubricating sleeve extends along the vertical direction, a guide rod is arranged in the guide lubricating sleeve, a buffer spring is sleeved at the lower part of the guide rod, and the top of the buffer spring is abutted with the bottom of the guide lubricating sleeve; and a spiral elevator for adjusting the gear reduction mechanism to move up and down is arranged on the left side of the lower box body.
2. The gear assembly for a pipe cutting apparatus of claim 1, wherein: an oil filling hole is formed in the top of the upper box body, and an oil unloading hole is formed in the bottom of the lower box body.
3. The gear assembly for a pipe cutting apparatus of claim 1, wherein: the rear part of the worm wheel shaft is provided with a first bearing, the middle part of the worm wheel shaft is provided with a second bearing, the second bearing and the first bearing are respectively positioned at the front side and the rear side of the worm wheel, and the worm wheel shaft is rotatably connected with the upper box body through the first bearing and the second bearing; the front side of the second bearing is provided with a first lip-shaped oil seal which is arranged between the worm wheel shaft and the upper box body.
4. The gear assembly for a pipe cutting apparatus of claim 3, wherein: the rear side of the first bearing is provided with a first round nut which is arranged on a worm wheel shaft, the worm wheel shaft is provided with a first round nut retaining washer matched with the first round nut, the first round nut retaining washer is abutted against the rear side surface of the first bearing, and the outer edge of the rear side surface of the first bearing is abutted against the inner side wall of the upper box body; a first hole check ring is arranged in the upper box body and is abutted against the front side surface of the first bearing; and the upper box body is also internally provided with a first hole elastic check ring, and the first hole elastic check ring is abutted against the front side surface of the second bearing.
5. The gear assembly for a pipe cutting apparatus of claim 1, wherein: the left end of the worm is provided with a third bearing, and the worm is in rotary connection with the worm gland through the third bearing; the left part of the worm is provided with a fourth bearing, the fourth bearing is positioned on the right side of the third bearing, the right part of the worm is provided with a fifth bearing, and the worm is rotatably connected with the lower box body through the fourth bearing and the fifth bearing; a second lip-shaped oil seal is arranged between the right end of the worm and the inner wall of the lower box body.
6. The gear assembly for a pipe cutting apparatus of claim 5, wherein: a second round nut is arranged on the left side of the fourth bearing, the second round nut is arranged on a worm, a second round nut retaining washer matched with the second round nut is arranged on the worm, the second round nut retaining washer is abutted against the left side face of the fourth bearing, a second hole retaining ring is arranged in the lower box body, the second hole retaining ring is abutted against the left side face of the fourth bearing, and the right side of the fourth bearing is abutted against the inner side wall of the lower box body; and a shaft check ring is sleeved at the right part of the worm and is abutted against the right side surface of the fifth bearing, and the left side of the fifth bearing is abutted against the inner side wall of the lower box body.
7. The gear assembly for a pipe cutting apparatus of claim 1, wherein: a first O-shaped sealing ring is arranged between the worm wheel end cover positioned at the rear side and the upper box body; and a second O-shaped sealing ring is arranged between the worm gland and the lower box body.
8. The gear assembly for a pipe cutting apparatus of claim 1, wherein: the square shaft is inserted into the right end of the worm so as to realize linkage of the square shaft and the worm.
9. The gear assembly for a pipe cutting apparatus of claim 1, wherein: the worm wheel is connected with a worm wheel shaft through a key.
10. The gear assembly for a pipe cutting apparatus according to any one of claims 1 to 9, wherein: and a second hole elastic retainer ring is arranged in the guide lubricating sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011536716.5A CN112696462B (en) | 2020-12-23 | 2020-12-23 | Gear transmission device for pipeline cutting equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011536716.5A CN112696462B (en) | 2020-12-23 | 2020-12-23 | Gear transmission device for pipeline cutting equipment |
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| Publication Number | Publication Date |
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| CN112696462A true CN112696462A (en) | 2021-04-23 |
| CN112696462B CN112696462B (en) | 2022-08-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011536716.5A Active CN112696462B (en) | 2020-12-23 | 2020-12-23 | Gear transmission device for pipeline cutting equipment |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2762922Y (en) * | 2005-01-10 | 2006-03-08 | 中国海洋石油总公司 | Climbing tube type bevelling cutting machine |
| US20120227522A1 (en) * | 2011-03-11 | 2012-09-13 | Timotion Technology Co., Ltd | High-load linear actuator |
| CN103335064A (en) * | 2013-07-04 | 2013-10-02 | 济南若泰数控科技有限公司 | Automatic clearance-removing double-worm speed reducer |
| CN205226312U (en) * | 2015-12-08 | 2016-05-11 | 浙江午马减速机有限公司 | Skewed tooth - worm gear reducer |
| CN110202429A (en) * | 2019-05-23 | 2019-09-06 | 佛山市尊聚自动化设备有限公司 | Automatic sander |
| CN209452886U (en) * | 2018-11-01 | 2019-10-01 | 苏州博合雅工程材料科技有限公司 | Pipeline processing automation equipment |
-
2020
- 2020-12-23 CN CN202011536716.5A patent/CN112696462B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2762922Y (en) * | 2005-01-10 | 2006-03-08 | 中国海洋石油总公司 | Climbing tube type bevelling cutting machine |
| US20120227522A1 (en) * | 2011-03-11 | 2012-09-13 | Timotion Technology Co., Ltd | High-load linear actuator |
| CN103335064A (en) * | 2013-07-04 | 2013-10-02 | 济南若泰数控科技有限公司 | Automatic clearance-removing double-worm speed reducer |
| CN205226312U (en) * | 2015-12-08 | 2016-05-11 | 浙江午马减速机有限公司 | Skewed tooth - worm gear reducer |
| CN209452886U (en) * | 2018-11-01 | 2019-10-01 | 苏州博合雅工程材料科技有限公司 | Pipeline processing automation equipment |
| CN110202429A (en) * | 2019-05-23 | 2019-09-06 | 佛山市尊聚自动化设备有限公司 | Automatic sander |
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| Title |
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| 唐晋: "《检修机具与特殊加工》", 31 March 1983, 水利电力出版社 * |
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