CN101215810B - Inserting type fishplate-free rail joint connector - Google Patents
Inserting type fishplate-free rail joint connector Download PDFInfo
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- CN101215810B CN101215810B CN2007101449802A CN200710144980A CN101215810B CN 101215810 B CN101215810 B CN 101215810B CN 2007101449802 A CN2007101449802 A CN 2007101449802A CN 200710144980 A CN200710144980 A CN 200710144980A CN 101215810 B CN101215810 B CN 101215810B
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Abstract
A plug-in steel rail joint connector with no buttcover plate of the invention relates to a steel rail joint connector, which aims at the problems of the buttcover plate connection type that the buttcover plate steel rail bolt holes can be easily cracked, the steel rail joint can be easily worn out, damaged, overlapped, collapsed and peeled off; and aims at the problems of large assembly work volume, bad weight-bearing and deformation ability of the joints of the vibration damping clampboard connection type and the symmetric inclined plane or inclined trapezohedron connection type with steel rail joint clampboards. Both ends of a static rail (1) of the invention are symmetrically provided with plug-in grooves (3), one end of a moving rail (2) is provided with a plug-in rod (4), the shape of the other end of the moving rail is the same with the section shape of a rail 60, plug-in grooves of two ends of the static rail (1)are internally provided with the plug-in rod (4) which is movably fit with the plug-in groove in transition, the lower end surface of the static rail (1) is provided with a base (5), and the relative positions of the static and moving rails are provided with conduction wires connection holes (7). The connector of the invention has strong weight-bearing ability, small work volume of adjusting and maintaining and good vibration damping ability, and is most suitable for high-speed railways, urban rails, subways, tunnels, bridges and cargo-passenger stations.
Description
Technical field
The present invention relates to a kind of rail joint connector.
Background technology
At present, the connection of railway track joint both domestic and external mainly is based on the splice bar ways of connecting, adopts connection of vibration damping clamping plate and symmetrical tapered plane or symmetrical inclined ladder to wear the form that the rail joint clamping plate connect in recent years in addition.Adopt splice bar to connect rail joint and have following problem: 1, there is crack problem in the splice bar rail bolt hole, begin by crack initiation, and down to fracture, be to expansion because rolling stock impacts due to the tired hurt that loads for several ten thousand times.Particularly after the railway speed increase heavy duty, this situation is more serious.Abovely the heavily loaded unit car of electrification is started back rail screw rhegma quantity statistics according to railway relevant department, through continuous 4 years analysis of statistical datas, severely injured rail (root) takes place in, the screw rhegma accounts for 40%~70.52% respectively, be year by year and increase progressively state, increase reaches 30.52 percentage points, and the general and horizon angle of cut at 45 of rhegma direction can be taken rail head off when serious.2, owing to be subjected to the tensile stress maximum around the bolt hole, the screw in the clamping plate scope is also perishable simultaneously, the fatigue damage of more having aggravated rail head.3, when rolling stock passes through rail joint, wheel is bigger to the rail joint impact force, make the rail joint place produce the button mouth, lowly problem such as collapse, peel off, also can cause the rail track frost boiling when serious, emit adverse consequences such as mud, strengthen the maintenance load of vehicle and rail track, also can influence passenger's comfort level of riding simultaneously.The type of attachment that adopts connection of vibration damping clamping plate and symmetrical tapered plane or symmetrical inclined ladder to wear the rail joint clamping plate exists the erection work amount big, the problem of joint distortion place bearing capacity difference.
Summary of the invention
The purpose of this invention is to provide a kind of inserting type fishplate-free rail joint connector, it can solve, and railway track joint adopts that the splice bar connected mode exists that splice bar rail bolt hole place is easy to crack, fatigue damage easily takes place rail joint, the button mouth, lowly problem such as collapse, peel off; The type of attachment that adopts connection of vibration damping clamping plate and symmetrical tapered plane or symmetrical inclined ladder to wear the rail joint clamping plate exists the erection work amount big, the problem of joint distortion place bearing capacity difference.
The present invention is made up of quiet rail and moving rail; The two ends of described quiet rail upper surface are symmetrically arranged with and move the inserting groove that rail is pegged graft, and inserting groove is arranged on the central axis of quiet rail, one end of described moving rail is provided with the grafting tenon that matches with inserting groove, described grafting tenon is arranged on the central axis of moving rail, be equipped with in the inserting groove at quiet rail two ends and its transition grafting tenon movingly, the shape of the cross section of the other end of moving rail is identical with the shape of the cross section of 60 rails, at least be provided with two bases on the lower surface of quiet rail along its length, the middle part of the lower surface of described base is an arc surface, and the corresponding position is horizontally arranged with wire connection hole on quiet rail and the moving rail; Described inserting groove is made up of inner end, leading flank, trailing flank, bottom face, outer inclined-plane; The inner end of described inserting groove is a V font end face, the leading flank of inserting groove is by first vertical guide, first inclined-plane and second inclined-plane are formed, the inner end on the inner end of described first vertical guide and first inclined-plane is connected with the front end of V font end face, the lower end of first vertical guide is connected with the upper end on first inclined-plane, the lower end on first inclined-plane is connected with the front end of bottom face, the outer end on the outer end of first vertical guide and first inclined-plane is connected with the inner end on second inclined-plane respectively, the lower end on second inclined-plane is connected with the front end on outer inclined-plane, the inner end on outer inclined-plane is connected with the outer end of bottom face, and the outer end on the outer end on second inclined-plane and outer inclined-plane is connected with a side end face of quiet rail; The trailing flank of described inserting groove is by second vertical guide, the 3rd inclined-plane and the 4th inclined-plane are formed, the inner end on the inner end of described second vertical guide and the 3rd inclined-plane is connected with the rear end of V font end face, the lower end of second vertical guide is connected with the upper end on the 3rd inclined-plane, the lower end on the 3rd inclined-plane is connected with the rear end of bottom face, the outer end on the outer end of second vertical guide and the 3rd inclined-plane is connected with the inner end on the 4th inclined-plane respectively, the lower end on the 4th inclined-plane is connected with the rear end on outer inclined-plane, the outer end on the 4th inclined-plane is connected with a side end face of quiet rail, first inclined-plane and the 3rd inclined-plane are symmetrical arranged and respectively to the front side and the rear side inclination of quiet rail, described second inclined-plane and the 4th inclined-plane are symmetrical arranged.
The present invention has following beneficial effect: 1, rail joint connector of the present invention has reasonable in design, supporting capacity is strong, the advantage that adjust, maintenance workload is little, also have the weakening function simultaneously, can satisfy rail in expanding with heat and contract with cold, the requirement that the joint expansion interstice coverage is big.2, because rail can produce the phenomenon of expanding with heat and contract with cold under different temperatures, make the rail joint telescopic variation produce the spacing that varies in size, when the present invention can make rail change, do not influence the normal operation of rolling stock in 0~20mm scope, can reduce maintenance, the adjustment number of times of rail joint like this.3, moving rail adopts transition to be connected movingly with quiet rail, can make dynamic and static rail joint synchronization lifting under the pressure of wheel changes, when wheel oversteps dynamic and static blank area, wheel is smoothly contacted with tread, guarantee safety when making wheel pass through rail joint, do not have and impact, can steadily cross continuously.This connector adapts to high-speed railway, city rail, subway, tunnel, bridge, field, passenger-cargo station most.
Description of drawings
Fig. 1 is a three-dimensional structure diagram of the present invention, Fig. 2 is the three-dimensional structure diagram of quiet rail 1, and Fig. 3 is the three-dimensional structure diagram of rail 2, and Fig. 4 is the front view of quiet rail 1, Fig. 5 is the vertical view of Fig. 4, Fig. 6 is the left view of Fig. 4, and Fig. 7 is the A-A sectional drawing of Fig. 4, and Fig. 8 is the upward view of Fig. 4, Fig. 9 is the front view of rail 2, Figure 10 is the vertical view of Fig. 9, and Figure 11 is the left view of Fig. 9, and Figure 12 is the right view of Fig. 9.
The specific embodiment
The specific embodiment one: in conjunction with Fig. 1~Fig. 4 present embodiment is described, present embodiment is made up of quiet rail 1 and moving rail 2; The two ends of described quiet rail 1 upper surface are symmetrically arranged with and move the inserting groove 3 that rail 2 is pegged graft, and inserting groove 3 is arranged on the central axis of quiet rail 1, one end of described moving rail 2 is provided with the grafting tenon 4 that matches with inserting groove 3, described grafting tenon 4 is arranged on the central axis of moving rail 2, be equipped with in the inserting groove 3 at quiet rail 1 two ends and its transition grafting tenon 4 movingly, the shape of the cross section of the other end of moving rail 2 is identical with the shape of the cross section of 60 rails, at least be provided with two bases 5 on the lower surface of quiet rail 1 along its length, the middle part of the lower surface of described base 5 is an arc surface 6, and the corresponding position is horizontally arranged with wire connection hole 7 on quiet rail 1 and the moving rail 2.Rail strength adopts new steel material 60-75 kilogram 880MPa; Rigidity is 1300MPa.
The specific embodiment two: in conjunction with Fig. 2, Fig. 4, Fig. 6 present embodiment is described, the inserting groove 3 of present embodiment is made up of inner end 8, leading flank, trailing flank, bottom face 11, outer inclined-plane 12; The inner end 8 of described inserting groove 3 is a V font end face, the leading flank of inserting groove 3 is by first vertical guide 13, first inclined-plane 14 and second inclined-plane 15 are formed, the inner end on the inner end of described first vertical guide 13 and first inclined-plane 14 is connected with the front end of V font end face, the lower end of first vertical guide 13 is connected with the upper end on first inclined-plane 14, the lower end on first inclined-plane 14 is connected with the front end of bottom face 11, the outer end on the outer end of first vertical guide 13 and first inclined-plane 14 is connected with the inner end on second inclined-plane 15 respectively, the lower end on second inclined-plane 15 is connected with the front end on outer inclined-plane 12, the inner end on outer inclined-plane 12 is connected with the outer end of bottom face 11, and the outer end on the outer end on second inclined-plane 15 and outer inclined-plane 12 is connected with a side end face of quiet rail 1; The trailing flank of described inserting groove 3 is by second vertical guide 16, the 3rd inclined-plane 17 and the 4th inclined-plane 18 are formed, the inner end on the inner end of described second vertical guide 16 and the 3rd inclined-plane 17 is connected with the rear end of V font end face, the lower end of second vertical guide 16 is connected with the upper end on the 3rd inclined-plane 17, the lower end on the 3rd inclined-plane 17 is connected with the rear end of bottom face 11, the outer end on the outer end of second vertical guide 16 and the 3rd inclined-plane 17 is connected with the inner end on the 4th inclined-plane 18 respectively, the lower end on the 4th inclined-plane 18 is connected with the rear end on outer inclined-plane 12, the outer end on the 4th inclined-plane 18 is connected with a side end face of quiet rail 1, first inclined-plane 14 and the 3rd inclined-plane 17 are symmetrical arranged and respectively to the front side and the rear side inclination of quiet rail 1, described second inclined-plane 15 and the 4th inclined-plane 18 are symmetrical arranged.So be provided with, have easy to assembly, connect reliable advantage.Other composition and annexation are identical with the specific embodiment one.
The specific embodiment three: in conjunction with Fig. 5 present embodiment is described, first vertical guide 13 of the inserting groove 3 of present embodiment and the distance H 1 between second vertical guide 16 are 30mm, and the width W 1 of the bottom face 11 of inserting groove 3 is 50mm.So be provided with, have the good advantage of connective stability.Other composition and annexation are identical with the specific embodiment two.
The specific embodiment four: present embodiment is described in conjunction with Fig. 4~Fig. 8, the leading flank of the quiet rail 1 of present embodiment and trailing flank are the stairstepping of symmetry, the exterior contour of the cross section of the last cascaded surface 19 of quiet rail 1 is long narrow square, the exterior contour of the cross section of the middle cascaded surface 20 of quiet rail 1 is wide rectangle, the exterior contour of the cross section of the downstairs face 21 of quiet rail 1 is trapezoidal, the height H 2 of the last cascaded surface 19 of described quiet rail 1 is 50mm, the height H 3 of the middle cascaded surface 20 of quiet rail 1 is 96mm, the height H 4 of the downstairs face 21 of quiet rail 1 is 30mm, the overall height H 5 of quiet rail 1 is 236mm, the total length L 1 of quiet rail 1 is 1070mm, the width W 2 of base 5 is 100mm, the length L 2 of inserting groove 3 is 100~120mm, and the depth H 6 of inserting groove 3 is 146mm, and described wire connection hole 7 is arranged on the middle cascaded surface 20 of quiet rail 1.So be provided with, have working stability, connect reliable advantage.Other composition and annexation are identical with the specific embodiment one.
The specific embodiment five: present embodiment is described in conjunction with Fig. 7, the equal rounding of each drift angle of each drift angle in each drift angle of the long narrow square-section 30 of the quiet rail 1 of present embodiment, wide rectangle cross section 31 and trapezoid cross section 32, the junction in the long narrow square-section 30 of quiet rail 1 and wide rectangle cross section 31 and the wide rectangle cross section 31 of quiet rail 1 and trapezoid cross section 32 are connected by transition arc.So be provided with, can be maintenance and provide convenience.Other composition and annexation are identical with the specific embodiment four.
The specific embodiment six: in conjunction with Fig. 3, Fig. 9~Figure 12 illustrates present embodiment, the moving rail 2 of present embodiment is by the grafting tenon 4 of making one, middle bearing part 22 is formed with the rail 23 that is connected identical with the shape of cross section of 60 rails, the leading flank of the intermediate supports part 22 of moving rail 2 and trailing flank are the stairstepping of symmetry, the shape of the cross section of the last cascaded surface 24 of moving rail 2 and size are identical with size with the shape of the cross section of the last cascaded surface 19 of quiet rail 1, the shape of the cross section of the middle cascaded surface 25 of moving rail 2 and size are identical with size with the shape of the cross section of the middle cascaded surface 20 of quiet rail 1, the shape of the cross section of the downstairs face 26 of moving rail 2 and size are identical with size with the shape of the cross section of the downstairs face 21 of quiet rail 1, be connected by the 5th inclined-plane 27 between the last cascaded surface 24 of moving rail 2 and the grafting tenon 4, the middle bearing part 22 of moving rail 2 is made up of perpendicular end surface 28 and angled end-face 29 near the end face that connects rail 23 1 sides, perpendicular end surface 28 connects with the inner end that is connected rail 23 by angled end-face 29, and described wire connection hole 7 is arranged on the middle cascaded surface 25 of moving rail 2.So be provided with, moving rail 2 is used with quiet rail 1, can prevent that dynamic and static rail joint from fatigue damage, button mouth taking place, lowly phenomenon such as collapse, peel off.Other composition and annexation are identical with the specific embodiment one.
The specific embodiment seven: in conjunction with Figure 10 present embodiment is described, the total length L 3 of the moving rail 2 of present embodiment is 500mm.So be provided with, can satisfy the needs of rail joint stability.Other composition and annexation are identical with the specific embodiment one or six.
During use, quiet rail is fixed on the sleeper by the traditional securing member of rail, the plug tenon of two moving rails is inserted into respectively in the slot at quiet rail two ends, again with the other end (promptly connecting the rail end) of two moving rails and the rail head welding that will be connected.Also be fixed on the corresponding sleeper for dynamic and static rail joint by the rail conventional fastener.
Claims (6)
1. inserting type fishplate-free rail joint connector is characterized in that it is made up of quiet rail (1) and moving rail (2); The two ends of described quiet rail (1) upper surface are symmetrically arranged with and move the inserting groove (3) that rail (2) is pegged graft, and inserting groove (3) is arranged on the central axis of quiet rail (1), one end of described moving rail (2) is provided with the grafting tenon (4) that matches with inserting groove (3), described grafting tenon (4) is arranged on the central axis of moving rail (2), be equipped with in the inserting groove (3) at quiet rail (1) two ends and its transition grafting tenon (4) movingly, the shape of the cross section of the other end of moving rail (2) is identical with the shape of the cross section of 60 rails, at least be provided with two bases (5) on the lower surface of quiet rail (1) along its length, the middle part of the lower surface of described base (5) is arc surface (6), and quiet rail (1) and moving rail (2) are gone up the corresponding position and be horizontally arranged with wire connection hole (7); Described inserting groove (3) is made up of inner end (8), leading flank, trailing flank, bottom face (11), outer inclined-plane (12); The inner end (8) of described inserting groove (3) is a V font end face, the leading flank of inserting groove (3) is by first vertical guide (13), first inclined-plane (14) and second inclined-plane (15) are formed, the inner end of the inner end of described first vertical guide (13) and first inclined-plane (14) is connected with the front end of V font end face, the lower end of first vertical guide (13) is connected with the upper end of first inclined-plane (14), the lower end on first inclined-plane (14) is connected with the front end of bottom face (11), the outer end of the outer end of first vertical guide (13) and first inclined-plane (14) is connected with the inner end of second inclined-plane (15) respectively, the lower end on second inclined-plane (15) is connected with the front end of outer inclined-plane (12), the inner end on outer inclined-plane (12) is connected with the outer end of bottom face (11), and the outer end on the outer end of second inclined-plane (15) and outer inclined-plane (12) is connected with a side end face of quiet rail (1); The trailing flank of described inserting groove (3) is by second vertical guide (16), the 3rd inclined-plane (17) and the 4th inclined-plane (18) are formed, the inner end of the inner end of described second vertical guide (16) and the 3rd inclined-plane (17) is connected with the rear end of V font end face, the lower end of second vertical guide (16) is connected with the upper end of the 3rd inclined-plane (17), the lower end on the 3rd inclined-plane (17) is connected with the rear end of bottom face (11), the outer end of the outer end of second vertical guide (16) and the 3rd inclined-plane (17) is connected with the inner end of the 4th inclined-plane (18) respectively, the lower end on the 4th inclined-plane (18) is connected with the rear end of outer inclined-plane (12), the outer end on the 4th inclined-plane (18) is connected with a side end face of quiet rail (1), first inclined-plane (14) and the 3rd inclined-plane (17) are symmetrical arranged and respectively to the front side and the rear side inclination of quiet rail (1), described second inclined-plane (15) and the 4th inclined-plane (18) are symmetrical arranged.
2. inserting type fishplate-free rail joint connector according to claim 1, first vertical guide (13) and the distance H between second vertical guide (16) 1 that it is characterized in that described inserting groove (3) are 30mm, and the width W 1 of the bottom face (11) of inserting groove (3) is 50mm.
3. inserting type fishplate-free rail joint connector according to claim 1, it is characterized in that the leading flank of described quiet rail (1) and the stairstepping that trailing flank is symmetry, the exterior contour of the cross section of the last cascaded surface (19) of quiet rail (1) is long narrow square, the exterior contour of the cross section of the middle cascaded surface (20) of quiet rail (1) is wide rectangle, the exterior contour of the cross section of the downstairs face (21) of quiet rail (1) is trapezoidal, the height H 2 of the last cascaded surface (19) of described quiet rail (1) is 50mm, the height H 3 of the middle cascaded surface (20) of quiet rail (1) is 96mm, the height H 4 of the downstairs face (21) of quiet rail (1) is 30mm, the overall height H 5 of quiet rail (1) is 236mm, the total length L 1 of quiet rail (1) is 1070mm, the width W 2 of base (5) is 100mm, the length L 2 of inserting groove (3) is 100~120mm, the depth H 6 of inserting groove (3) is 146mm, and described wire connection hole (7) is arranged on the middle cascaded surface (20) of quiet rail (1).
4. inserting type fishplate-free rail joint connector according to claim 3, it is characterized in that each drift angle of the long narrow square-section (30) of described quiet rail (1), each drift angle in wide rectangle cross section (31) and the equal rounding of each drift angle of trapezoid cross section (32), the long narrow square-section 30 of quiet rail (1) is connected by transition arc with trapezoid cross section (32) with the junction in wide rectangle cross section (31) and the wide rectangle cross section (31) of quiet rail (1).
5. inserting type fishplate-free rail joint connector according to claim 3, it is characterized in that described moving rail (2) is by the grafting tenon (4) of making one, middle bearing part (22) is formed with the rail (23) that is connected identical with the shape of cross section of 60 rails, the leading flank of the intermediate supports part (22) of moving rail (2) and trailing flank are the stairstepping of symmetry, the shape of the cross section of the last cascaded surface (24) of moving rail (2) and size are identical with size with the shape of the cross section of the last cascaded surface (19) of quiet rail (1), the shape of the cross section of the middle cascaded surface (25) of moving rail (2) and size are identical with size with the shape of the cross section of the middle cascaded surface (20) of quiet rail (1), the shape of the cross section of the downstairs face (26) of moving rail (2) and size are identical with size with the shape of the cross section of the downstairs face (21) of quiet rail (1), be connected by the 5th inclined-plane (27) between the last cascaded surface (24) of moving rail (2) and the grafting tenon (4), the middle bearing part (22) of moving rail (2) is made up of perpendicular end surface (28) and angled end-face (29) near the end face that connects rail (23) one sides, perpendicular end surface (28) connects with the inner end that is connected rail (23) by angled end-face (29), and described wire connection hole (7) is arranged on the middle cascaded surface (25) of moving rail (2).
6. inserting type fishplate-free rail joint connector according to claim 1 or 5 is characterized in that the total length L 3 of described moving rail (2) is 500mm.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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CN2007101449802A CN101215810B (en) | 2007-12-29 | 2007-12-29 | Inserting type fishplate-free rail joint connector |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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CN2007101449802A CN101215810B (en) | 2007-12-29 | 2007-12-29 | Inserting type fishplate-free rail joint connector |
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CN101215810A CN101215810A (en) | 2008-07-09 |
CN101215810B true CN101215810B (en) | 2011-01-05 |
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CN2007101449802A Expired - Fee Related CN101215810B (en) | 2007-12-29 | 2007-12-29 | Inserting type fishplate-free rail joint connector |
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Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
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CN102587229B (en) * | 2012-04-10 | 2013-11-27 | 莱芜美澳冶金科技有限公司 | Joint for track panel and manufacturing and installing method |
CN105158279B (en) * | 2015-10-10 | 2017-10-20 | 东北石油大学 | The rail mechanism of pipe welding line detecting device |
CN108978363B (en) * | 2018-07-06 | 2023-09-22 | 中铁二院工程集团有限责任公司 | Unfixed rail joint |
EP3636576A1 (en) | 2018-10-11 | 2020-04-15 | Otis Elevator Company | Elevator guide rail support assemblies |
CN109778605A (en) * | 2019-03-22 | 2019-05-21 | 上海应用技术大学 | A kind of Novel inserting connection type rail joint |
CN111074700A (en) * | 2019-12-31 | 2020-04-28 | 安阳嘉和机械有限公司 | Dip tank miter joint type quick-change track assembly |
CN111215822B (en) * | 2020-03-16 | 2024-04-26 | 固伦轩霖轨道交通科技有限公司 | Welding seam clamping plate |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB260120A (en) * | 1925-12-07 | 1926-10-28 | Arnold Slade | Improvements in and relating to railway rail joints |
CN2074775U (en) * | 1990-08-09 | 1991-04-10 | 代绍杰 | Rail track joggling machine |
CN2089020U (en) * | 1991-05-30 | 1991-11-20 | 邵德彬 | Special-shaped vibration-free rail joint |
CN1099831A (en) * | 1993-09-01 | 1995-03-08 | 戴坚忍 | Collision-proof shock-absorbing device for railway track |
CN2666983Y (en) * | 2003-06-13 | 2004-12-29 | 伍天星 | Railway |
CN201148578Y (en) * | 2007-12-29 | 2008-11-12 | 陈力求 | Inserted type non-fish plate rail joint connector |
-
2007
- 2007-12-29 CN CN2007101449802A patent/CN101215810B/en not_active Expired - Fee Related
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB260120A (en) * | 1925-12-07 | 1926-10-28 | Arnold Slade | Improvements in and relating to railway rail joints |
CN2074775U (en) * | 1990-08-09 | 1991-04-10 | 代绍杰 | Rail track joggling machine |
CN2089020U (en) * | 1991-05-30 | 1991-11-20 | 邵德彬 | Special-shaped vibration-free rail joint |
CN1099831A (en) * | 1993-09-01 | 1995-03-08 | 戴坚忍 | Collision-proof shock-absorbing device for railway track |
CN2666983Y (en) * | 2003-06-13 | 2004-12-29 | 伍天星 | Railway |
CN201148578Y (en) * | 2007-12-29 | 2008-11-12 | 陈力求 | Inserted type non-fish plate rail joint connector |
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