CN108399958B - Quick-changing device for horizontal motor for nuclear industry - Google Patents
Quick-changing device for horizontal motor for nuclear industry Download PDFInfo
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- CN108399958B CN108399958B CN201810447818.6A CN201810447818A CN108399958B CN 108399958 B CN108399958 B CN 108399958B CN 201810447818 A CN201810447818 A CN 201810447818A CN 108399958 B CN108399958 B CN 108399958B
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21D—NUCLEAR POWER PLANT
- G21D1/00—Details of nuclear power plant
- G21D1/02—Arrangements of auxiliary equipment
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
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- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Manipulator (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Abstract
The invention discloses a horizontal motor quick-change device for nuclear industry, which is characterized in that an inclined stop block, an electric socket, an output shaft and a positioning sleeve are fixed on a base, the side part of the base is movably connected with a pressing plate, the pressing plate is matched with the inclined stop block, the electric socket is positioned between the inclined stop block and the output shaft, the positioning sleeve is positioned at the top of the output shaft, the inclined stop block is movably connected with a sliding plate through an inclined plane, the electric socket is fixed with a positive stop block, one end of the sliding plate is matched with a reverse conical surface arranged on the positive stop block, the other end of the sliding plate is matched with the pressing plate, a motor, a guide sleeve and a movable electric plug are horizontally arranged on the sliding plate, the output end of the motor is connected with a coupling, the guide sleeve is positioned outside the coupling, one end of the coupling is internally connected with an elastic part, the other end of the elastic part is connected with the top of the quick-change part, the coupling is matched with the output shaft through the quick-change part, the guide sleeve is matched with the positioning sleeve, the electric plug is connected with the motor, and the electric plug is matched with the electric socket.
Description
Technical Field
The invention relates to a quick-changing device, in particular to a horizontal motor quick-changing device for nuclear industry.
Background
At present, in the nuclear industry field, the work site is required to be arranged in a closed space due to the influence of nuclear radiation and works through an automatic robot, at present, under the severe working condition, a mechanical part generally has a higher service life, a motor is used as a power source, and the work site is easy to damage due to the fact that the work site is required to work continuously for a long time, but workers cannot enter the work site to conduct routine maintenance, the workers can only know the work site until the motor is damaged, paralysis of the whole system is easy to be caused, the working efficiency is seriously influenced, and meanwhile, the work site has high dangerousness.
Disclosure of Invention
The invention aims to solve the technical problems that four sides of a slide plate are positioned in the butt joint process by designing a pressing plate, a slide plate, an inclined baffle and a positive baffle, a motor is accurately butt-jointed to a speed reducer, a butt joint structure consists of an inner gear sleeve, an upper outer gear, a lower outer gear and an elastic piece, the motor and an output shaft can synchronously rotate through mutual meshing between teeth of the inner gear sleeve and the upper outer gear and between teeth of the inner gear sleeve and the lower outer gear, the inner gear sleeve and the upper outer gear and between the inner gear sleeve and the lower outer gear are not fixedly connected, a force piece is embedded into an annular groove of the inner gear sleeve and is not fixedly connected with the annular groove, and the upper outer gear and the lower outer gear can achieve the function of automatic positioning by lifting the inner gear sleeve when being in butt joint, so that the rapid butt joint of the motor is realized, and the motor can be overhauled in a short time.
The invention provides a horizontal motor quick-changing device for nuclear industry for the technical problems.
The technical scheme of the invention is as follows:
the utility model provides a nuclear industry is with horizontal motor quick change device, includes electric plug, electric socket, base, clamp plate, slide, oblique stop, positive stop, motor, output shaft, elastic component, shaft coupling, uide bushing, spacer and quick change piece, fixed oblique stop, electric socket, output shaft and spacer on the base, base lateral part swing joint clamp plate, clamp plate and oblique stop cooperation, electric socket is located between oblique stop and the output shaft, the spacer is located output shaft top, oblique stop passes through the inclined plane swing joint slide that sets up, electric socket is fixed with positive stop, slide one end and the back taper face cooperation that positive stop set up, the slide other end and clamp plate cooperation, the motor that fixed level set up on the slide, uide bushing and swing joint electric plug, the motor output end is connected the shaft coupling, the uide bushing is located the shaft coupling outside, shaft coupling internal connection elastic component one end, elastic component other end is connected quick change piece top, the inside and the shaft coupling are through quick change piece and output shaft cooperation, the uide bushing and spacer cooperation, electric plug and motor connection, electric plug and electric socket cooperation. The inclined stop blocks arranged on two sides of the base position two sides of the slide plate through the inclined planes, so that the left and right movement of the slide plate is limited, the front part of the slide plate is positioned by the reverse conical surface of the positive stop block, the front and back movement and the up and down movement of the slide plate are limited, and the rear part of the slide plate is pressed downwards by the pressing plate, so that the fixation and the positioning of the slide plate are realized; the guide sleeve is used for coarse guiding, the position of the quick-change structure is preliminarily determined, the quick-change piece ensures quick separation and connection of the motor and the output shaft, and the elastic piece ensures that the quick-change piece can be adjusted up and down when the motor is connected with the output shaft, so that automatic positioning is realized.
Further quick change piece includes interior tooth cover, goes up external gear and lower external gear, goes up external gear and the coaxial fixedly connection of shaft coupling, goes up external gear lateral surface and is provided with the external tooth, and internal tooth is seted up to the inside cavity of internal tooth cover and inner wall, and the top sets up annular groove in the interior tooth cover, and elastic component movably embeds in the annular groove, and the elastic component other end movably embeds inside the shaft coupling, and lower external gear links firmly with the output shaft is coaxial, and lower external gear lateral surface is provided with the external tooth, goes up external gear, lower external gear respectively with the cooperation of internal tooth cover. The lower external gear is sleeved on the output shaft, the upper external gear is sleeved on the shaft of the coupler, the inner gear sleeve and the upper external gear and the inner gear sleeve and the lower external gear are meshed with each other through teeth, the synchronous rotation of the motor and the output shaft is ensured, the elastic piece is not fixedly connected between the inner gear sleeve and the upper external gear and between the inner gear sleeve and the lower external gear, the elastic piece is embedded into an annular groove of the inner gear sleeve and is not fixedly connected with the annular groove, the upper external gear and the lower external gear can achieve the automatic positioning function through lifting the inner gear sleeve when in butt joint, and the elastic piece is prevented from rotating when the inner gear sleeve rotates, so that the elastic piece is prevented from being damaged.
Preferably, the guide sleeve is provided with a positioning key, the side surface of the guide sleeve is provided with a guide groove, the top of the guide groove is a conical surface, the positioning key is matched with the guide groove, the bottom surface of the guide sleeve is provided with a chamfer, and the bottom of the guide sleeve is provided with a stepped platform with the chamfer. The chamfer on the bottom surface of the guide sleeve continuously corrects the position of the quick-change structure; the positioning key on the step surface of the guide sleeve is matched with the guide groove on the guide sleeve, the position of the quick-change structure is finally determined, and the position of the motor is determined through three-level positioning, so that the positioning accuracy of the quick-change structure is ensured.
Preferably, the electric plug further comprises a linear guide rail, wherein the linear guide rail is fixedly connected with the sliding plate, and the electric plug is fixed on the linear guide rail. The linear guide rail is used for giving the buffer space of the electric plug when the electric plug is automatically aligned, so that the electric plug is prevented from being damaged, and the electric plug is convenient to butt joint.
Preferably, the pressing plate comprises a handle, a cam and a spring, wherein the handle is movably connected with the base, the cam is fixedly connected with the handle in a clamping sleeve manner, the spring is arranged between the base and the handle, and the cam is provided with a spiral surface and is matched with the sliding plate through the spiral surface. The cam can rotate by rotating the handle, and the spiral surface of the cam can lock the sliding plate along with the rotation of the cam, so that the four sides of the sliding plate are positioned; the spring is fixed between the handle and the handle fixing block, plays a role in locking the handle, enables the handle not to rotate, and further ensures accurate positioning of the sliding plate.
Preferably, the device further comprises a speed reducer, a hand-operated interface and a lifting lug, wherein the speed reducer is connected with the output shaft, the hand-operated interface is connected with the speed reducer, the guide sleeve is fixedly connected with the top of the speed reducer, and the lifting lug is fixedly connected with the sliding plate. The speed reducer is used for being connected with subsequent mechanism, and manual maintenance operation can be carried out when hand interface guarantees to break down, guarantees when the lug is used for hoisting the slide, and the slide is in the horizontal position and does benefit to the matching of slide and oblique dog.
Compared with the prior art, the invention has the following advantages and effects:
1. according to the invention, the inclined stop blocks arranged on two sides of the base position two sides of the slide plate through the inclined surfaces, so that the slide plate is limited to move left and right, the front part of the slide plate is positioned by the reverse conical surface of the positive stop block, the front and back movement and the up and down movement of the slide plate are limited, the rear part of the slide plate is pressed down by the pressing plate, the fixing and the positioning of the slide plate are further realized, the mechanical arm only needs to place the slide plate on the inclined stop blocks, then the slide plate is pushed, and finally the accurate positioning can be completed by pulling the pressing plate, so that the positioning requirement on the mechanical arm is reduced.
2. The positioning keys on two sides of the guide sleeve designed by the invention are used for coarse guiding, and the position of the quick-change structure is primarily determined; the chamfer on the bottom surface of the guide sleeve continuously corrects the position of the quick-change structure; the positioning key on the step surface of the guide sleeve is matched with the guide groove on the guide sleeve, the position of the quick-change structure is finally determined, and the position of the motor is determined through three-level positioning, so that the positioning accuracy of the quick-change structure is ensured.
3. The invention relates to an inner gear sleeve, an upper external gear, a lower external gear and an elastic piece, wherein the lower external gear is sleeved on an output shaft, the upper external gear is sleeved on a shaft of a coupler, the inner gear sleeve and the upper external gear and the inner gear sleeve and the lower external gear are meshed with each other through teeth, the synchronous rotation of a motor and the output shaft is ensured, the inner gear sleeve and the upper external gear and the inner gear sleeve and the lower external gear are not fixedly connected, an inner force piece is embedded into an annular groove of the inner gear sleeve and is not fixedly connected with the annular groove, the upper external gear and the lower external gear can achieve the function of automatic positioning by lifting the inner gear sleeve when in butt joint, and the elastic piece is prevented from rotating when the inner gear sleeve rotates, so that the elastic piece is prevented from being damaged.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a cross-sectional view of the present invention.
FIG. 3 is an enlarged view of a portion of the quick change member of FIG. 2;
fig. 4 is a schematic rear view of the present invention.
Description of the reference numerals:
a base 1; a pressing plate 2; a motor 3; a guide sleeve 4; a positioning sleeve 5;
a positioning key 6; a linear guide rail 7; a slide plate 8; an inclined stopper 9; an electrical plug 10;
an electrical outlet 11; a positive stop 12; a speed reducer 13; an output shaft 14; a hand interface 15;
a coupling 16; a compression spring 17; an inner tooth cover 18; an upper external gear 19; a lower external gear 20;
a handle 21; a cam 22; a spring 23; lifting lugs 24; a slide rail 25; a slider 26.
Detailed Description
The present invention will be described in further detail with reference to the following examples, which are illustrative of the present invention and are not intended to limit the present invention thereto.
Example 1: as shown in fig. 1 to 3, the quick-change device for the horizontal motor for the nuclear industry comprises a pressing plate 2, an electric plug 10, a linear guide rail 7, an inclined stop block 9, a positive stop block 12, a lifting lug 24, a sliding plate 8, an electric socket 11, a positioning key 6, a base 1, a motor 3, a speed reducer 13, an output shaft 14, a pressure spring 17, a coupler 16, a guide sleeve 4, a positioning sleeve 5, an inner gear sleeve 18, an upper outer gear 19 and a lower outer gear 20, wherein the base 1 is a steel platform, the sliding plate 8 is a platform with inclined surfaces at the front side, the rear side and the right side, the sliding plate 8 is matched with the inclined surface of the inclined stop block 9, the right side of the sliding plate 8 is matched with the inclined surface of the positive stop block 12, the motor 3 adopts an existing servo motor, the speed reducer 13 adopts a conventional speed reducer, the electric plug 10 and the electric socket 11 adopt an existing motor plug and socket, the coupler 16 adopts a conventional coupler, the pressure spring 17 and the spring 23 are an existing compression spring, the linear guide rail 7 consists of a slide rail 25 and a slide block 26, the slide rail 25 and the slide block 26 are of the existing slide rail slide block structure, the speed reducer 13 is fixed on the right side of the upper surface of the base 1 through bolts, the pressing plate 2 is fixed on the left side surface of the base, the pressing plate 2 comprises a handle 21, a cam 22 and a spring 23, a rotating shaft of the handle 21 penetrates through a bracket at the bottom of the base 1, the front end of the rotating shaft of the handle 21 is provided with threads and is connected with two round nuts, the spring 23 is arranged between the round nuts and the rotating shaft of the handle 21, the cam 22 is arranged between the handle 21 and the bracket at the bottom of the base 1, the two inclined baffle blocks 9 are respectively fixed on the front end and the rear end of the upper surface of the base 1 through bolts, the inclined surfaces of the inclined baffle blocks 9 are inclined upwards, the electric socket 11 is fixed on the bracket at the middle position of the upper surface of the base 1 through bolts, the two ends of the positive baffle block 12 are respectively fixed on the bracket at the front side and the rear side of the middle position of the base 1 through bolts, the inclined plane of the positive stop block 12 is inclined downwards, the sliding plate 8 is arranged on the inclined stop block 9, the motor 3 is fixed at the middle part of the sliding plate 8 through a bolt, the output end of the motor 3 is connected with the coupler 16, the output end of the coupler 16 passes through the inner gear sleeve 18 and is coaxially connected with the upper outer gear 19 and is in interference fit, annular inner grooves are formed in the coupler 16 and the inner gear sleeve 18, two ends of the pressure spring 17 are embedded into the two annular inner grooves and are not fastened with the inner grooves, the pressure spring 17 can rotate relative to the inner grooves, the lower outer gear 19 is coaxially connected with the speed reducer 13 and in interference fit, the upper outer gear 19 and the lower outer gear 20 are all existing circular gears, the inner gear sleeve 18 is hollow and is internally provided with inner teeth matched with the outer teeth of the upper outer gear 19 and the lower outer gear 20, the speed reducer 13 is connected with the output shaft 14, the guide sleeve 4 is connected with the bottom of the base and is positioned outside the coupler 16, the guide sleeve side is fixed with the positioning key 6 through a bolt, the positioning sleeve 5 is fixed on the left side of the speed reducer 13 through a bolt, the side face of the positioning sleeve 5 is provided with a square groove, the positioning key 6 can be inserted into the square groove, the sliding rail 25 is fixed on the upper side of the sliding plate 8, the sliding block 26 is sleeved on the sliding rail 25, the sliding block 26 is fixed on the sliding rail 25, the bottom surface of the motor 10 is fixed on the electric wire harness 10 and the electric wire harness 10 is matched with the electric wire harness 10, and the electric wire harness 11 is fixed on the electric plug 11.
When the automatic electric power jack is used, the lifting lug 24 is clamped by a mechanical arm, the sliding plate 8 is moved to a motor quick-change area, the mechanical arm places the sliding plate 8 in the inclined stop 9, the right side of the sliding plate 8 is pushed to be in contact with the positive stop 12, then the lifting lug 23 is loosened by the mechanical arm and the handle 21 is rotated, the cam 22 rotates to push the left side of the sliding plate 8, the right side of the sliding plate 8 is positioned by means of the inclined surface of the positive stop 12, the front side and the rear side of the sliding plate 8 are positioned by means of the inclined surface of the inclined stop 9, finally the cam 22 is clamped with the left side of the sliding plate 8 to finish four-side positioning, the handle 21 is loosened by the mechanical arm, the handle 21 realizes self-locking under the pressure of the spring 23, in the positioning process, the positioning key 6 on the side of the guide sleeve 4 firstly makes rough guide by means of the conical surface of the positioning sleeve 5, then the step under the guide sleeve 4 continues to correct the position of the motor 1, finally the positioning key 6 enters the square groove, finally the position of the motor 1 is determined, in the butting process, the upper external gear 19 is positioned in the internal gear 20 and meshed with the internal gear 18, the internal gear 18 is gradually approaches the lower gear 20, when the external gear 20 contacts the internal gear 20, the external gear 20 is in contact with the external gear 20, the internal gear 20 is in contact with the internal gear 20, the internal gear 20 is gradually rotates, the internal gear 20 is meshed with the internal gear 20, and then the internal gear 20 is gradually rotates under the internal gear 20, and the internal gear 20 is meshed with the internal gear 20, and the internal gear 20 is gradually and the internal gear 20 is meshed under the internal gear and the internal gear 20.
Example 2:
this embodiment is substantially the same as embodiment 1 except that: in embodiment 2, the bottom of the guide sleeve 4 is provided with a stepped platform, the stepped part is provided with a chamfer, the step of the guide sleeve 4 can be inserted into the positioning sleeve 5, the chamfer can enable the step to slide into the positioning sleeve 5, the guide sleeve 4 is inserted into the positioning sleeve, the upper part of the square groove on the side surface of the positioning sleeve 5 is provided with a conical chamfer, the positioning key 6 is initially positioned through the conical surface, and then the positioning key 6 is inserted into the square groove to finish accurate positioning.
Example 3:
this embodiment is substantially the same as embodiment 4 except that: in embodiment 5, the speed reducer 13 is externally connected with the hand-operated interface 15, and the speed reducer can be manually pushed to rotate through the hand-operated interface 15.
In addition, the specific embodiments described in the present specification may differ in terms of parts, shapes of components, names, and the like. All equivalent or simple changes of the structure, characteristics and principle according to the inventive concept are included in the protection scope of the present invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions in a similar manner without departing from the scope of the invention as defined in the accompanying claims.
Claims (6)
1. The utility model provides a nuclear industry is with horizontal motor quick change device, its characterized in that includes electric plug, electric socket, base, clamp plate, slide, oblique stop, positive stop, motor, output shaft, elastic component, shaft coupling, uide bushing, spacer sleeve and quick change piece, fixed oblique stop, electric socket, output shaft and spacer sleeve on the base, base lateral part swing joint clamp plate, clamp plate and oblique dog cooperation, electric socket is located between oblique stop and the output shaft, the spacer sleeve is located output shaft top, oblique stop passes through the inclined plane swing joint slide that sets up, electric socket is fixed with positive stop, slide one end and the back taper face cooperation that positive stop set up, the slide other end and clamp plate cooperation, fixed level set up motor, uide bushing and swing joint electric plug on the slide, the motor output connection shaft coupling is located the shaft coupling outside to the uide bushing, shaft coupling internal connection elastic component one end, elastic component other end connects quick change piece top, the inside and coupling, the shaft coupling passes through quick change piece and output shaft cooperation, the uide bushing and spacer sleeve cooperation, electric plug and motor connection, electric plug and electric socket cooperation.
The quick-change piece comprises an inner gear sleeve, an upper external gear and a lower external gear, wherein the upper external gear is coaxially and fixedly connected with the coupler, the lower external gear is coaxially and fixedly connected with the output shaft, and the upper external gear and the lower external gear are respectively matched with the inner gear sleeve.
2. The horizontal motor quick-change device for nuclear industry according to claim 1, wherein the outer side surface of the upper external gear is provided with external teeth, the interior of the internal gear sleeve is hollow, the inner wall of the internal gear sleeve is provided with internal teeth, the inner top of the internal gear sleeve is provided with an annular groove, the elastic piece is movably embedded in the annular groove, the other end of the elastic piece is movably embedded in the coupler, and the outer side surface of the lower external gear is provided with external teeth.
3. The horizontal motor quick-change device for nuclear industry according to claim 2, wherein the guide sleeve is provided with a positioning key, the side surface of the guide sleeve is provided with a guide groove, the top of the guide groove is a conical surface, the positioning key is matched with the guide groove, the bottom surface of the guide sleeve is provided with a chamfer, and the bottom of the guide sleeve is provided with a step table with the chamfer.
4. The vertical motor quick-change device for nuclear industry according to claim 3, further comprising a linear guide rail fixedly connected to the slide plate and an electrical plug fixed to the linear guide rail.
5. The device for quickly changing a vertical motor for nuclear industry according to claim 4, wherein the pressing plate comprises a handle, a cam and a spring, the handle is movably connected with the base, the cam is fixedly connected with the handle in a clamping sleeve manner, the spring is arranged between the base and the handle, and the cam is provided with a spiral surface and is matched with the sliding plate through the spiral surface.
6. The horizontal motor quick-change device for nuclear industry according to any one of claims 2 to 5, further comprising a speed reducer, a hand-operated interface and a lifting lug, wherein the speed reducer is connected with the output shaft, the hand-operated interface is connected with the speed reducer, the guide sleeve is fixedly connected with the top of the speed reducer, and the lifting lug is fixedly connected with the sliding plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810447818.6A CN108399958B (en) | 2018-05-11 | 2018-05-11 | Quick-changing device for horizontal motor for nuclear industry |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810447818.6A CN108399958B (en) | 2018-05-11 | 2018-05-11 | Quick-changing device for horizontal motor for nuclear industry |
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| CN108399958A CN108399958A (en) | 2018-08-14 |
| CN108399958B true CN108399958B (en) | 2023-07-21 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114483810A (en) * | 2020-10-27 | 2022-05-13 | 核工业理化工程研究院 | Rapid butt joint structure and method for motor and speed reducer |
| CN112240353B (en) * | 2020-12-18 | 2021-03-16 | 杭州景业智能科技股份有限公司 | Coupling for flexibly positioning and connecting motor power system in nuclear industry |
| CN112253638A (en) * | 2020-12-18 | 2021-01-22 | 杭州景业智能科技股份有限公司 | Coupling structure capable of being rapidly assembled in nuclear industrial equipment |
| CN114523442B (en) * | 2022-02-24 | 2024-04-19 | 北京半导体专用设备研究所（中国电子科技集团公司第四十五研究所） | Docking device and semiconductor device |
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| US6478587B2 (en) * | 2001-03-06 | 2002-11-12 | Stanley S. Sharples | Retractable electric wall outlet assembly |
| DE102009024724A1 (en) * | 2009-06-12 | 2010-12-16 | Westinghouse Electric Germany Gmbh | Gear for core enclosure screw manipulator, particularly for inserts in nuclear plants, has drive shaft, two output shafts and housing enclosing gear |
| CN206172525U (en) * | 2016-10-25 | 2017-05-17 | 杭州景业智能科技有限公司 | Robot is transported to external product container for nuclear of motor |
| CN107055646A (en) * | 2017-05-15 | 2017-08-18 | 嵊州市晟祥盈净水设备有限公司 | A kind of domestic water processing equipment for being easy to quick separating |
| CN107497897B (en) * | 2017-09-25 | 2024-03-08 | 新乡天丰机械制造有限公司 | Novel intelligent width-adjusting cold roll forming device for through shaft |
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| 中部槽推移耳与液压支架连接方式的结构分析与改进;宁波;杨绍雷;;矿山机械(08);全文 * |
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