CN211285225U - Self-locking type connecting mechanism - Google Patents
Self-locking type connecting mechanism Download PDFInfo
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- CN211285225U CN211285225U CN201921367632.6U CN201921367632U CN211285225U CN 211285225 U CN211285225 U CN 211285225U CN 201921367632 U CN201921367632 U CN 201921367632U CN 211285225 U CN211285225 U CN 211285225U
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Abstract
The utility model discloses a from locking-type coupling mechanism, include: the device comprises a driving shaft, a driven shaft, a rotating arm assembly, a swing rod assembly, an oil cylinder assembly, an arc groove disc and a hook; the driving shaft and the driven shaft are parallel to each other, and two ends of the driving shaft and the driven shaft are supported on the main bridge section through bearings respectively; one end of the rotating arm assembly and one end of the oscillating bar assembly are respectively and coaxially fixed on the driving shaft, more than one hook is arranged on the driven shaft along the axial direction of the driven shaft, and the hook end of the driven shaft is matched with the auxiliary bridge section; the arc groove disc is fixed on the driven shaft, an arc groove is formed in the arc groove disc, the swing rod assembly is matched with the arc groove of the arc groove disc, and the swing rod assembly is used for pushing the arc groove disc to reach the end portion of the arc groove on the arc groove disc to form a mechanical dead point so as to achieve self-locking; when the driving shaft rotates, the swing rod assembly drives the driven shaft to rotate around the axial direction of the driven shaft through the arc groove disc, and the other end of the rotating arm assembly is matched with the oil cylinder assembly and used for converting the telescopic motion of the oil cylinder assembly into the rotation of the rotating arm assembly around the driving shaft.
Description
Technical Field
The utility model relates to a coupling mechanism technical field, concretely relates to from locking-type coupling mechanism.
Background
The connection of main bridge section and vice bridge section is crucial in the erection procedure of emergent bridge, has very big influence to the security and the stability of bridge. When the main bridge section is connected with the auxiliary bridge section, a set of connecting mechanism is needed to connect the main bridge section with the auxiliary bridge section through an external driving mechanism. When the bridge is erected, the driving mechanism is separated from the connecting mechanism, and the connecting mechanism keeps the connection of the main bridge section and the auxiliary bridge section by self-locking performance under the condition of no external driving force.
In the self-locking connecting mechanism of the main bridge section and the auxiliary bridge section in the prior art, a hydraulic motor is adopted to drive a screw to screw in, a connecting hook on the main bridge section is pushed to rotate around a fixed shaft until the hook hooks a connecting piece of the auxiliary bridge section, and meanwhile, the connecting mechanism keeps stable connection of the main bridge section and the auxiliary bridge section through self-locking of threaded connection.
The self-locking connecting mechanism in the prior art has the following defects: although the main bridge section and the auxiliary bridge section can be connected by using the structural form that the screw rod is driven by the hydraulic motor to push the connecting hook on the main bridge section, the hydraulic motor has higher use and maintenance cost and larger occupied space, and the repeated screwing of the screw rod can damage screw threads, so that the self-locking performance of the self-locking connecting mechanism is reduced.
Disclosure of Invention
In view of this, the utility model provides a from locking-type coupling mechanism, simple structure, with low costs, occupation space are little, can reach stable auto-lock, and the unblock is convenient.
The technical scheme of the utility model is that: a self-locking connection comprising: the device comprises a driving shaft, a driven shaft, a rotating arm assembly, a swing rod assembly, an oil cylinder assembly, an arc groove disc and a hook;
the driving shaft and the driven shaft are parallel to each other, and two ends of the driving shaft and the driven shaft are supported on the main bridge section through bearings respectively;
one end of the rotating arm assembly and one end of the oscillating bar assembly are respectively fixed on the driving shaft, more than one hook is arranged on the driven shaft along the axial direction of the driven shaft, and the hook end of the driven shaft is matched with the auxiliary bridge section; the arc groove disc is fixed on the driven shaft, an arc groove is formed in the arc groove disc, the other end of the swing rod assembly is matched with the arc groove of the arc groove disc, when the driving shaft rotates, the swing rod assembly pushes the arc groove disc to drive the driven shaft to rotate around the axial direction of the driven shaft, meanwhile, the swing rod assembly moves in the arc groove of the arc groove disc, when the swing rod assembly moves to the end portion of the arc groove disc, a mechanical dead point is formed to achieve self-locking, at the moment, the driven shaft rotates in place, and the hook end of the hook is hooked on the; the other end of the rotating arm assembly is matched with the oil cylinder assembly and used for converting the telescopic motion of the oil cylinder assembly into the rotation of the rotating arm assembly around the driving shaft.
As a preferred aspect, the swivel arm assembly includes: rocking arm main shaft, rocking arm gyro wheel, rocking arm bearing and apron, the oil cylinder subassembly includes: an oil cylinder and a guide groove;
the tumbler main shaft is Z-shaped, one horizontal end of the tumbler main shaft is axially provided with a mounting hole along the horizontal end, the tumbler main shaft is fixed on the driving shaft through the mounting hole, the other horizontal end of the tumbler main shaft is a mounting shaft, the tumbler roller is supported on the mounting shaft through a tumbler bearing, and the tumbler roller and the tumbler bearing are axially limited by the cover plate from the right end of the mounting shaft;
the oil cylinder is fixed on the rack, a guide block is fixed at the end part of a piston rod of the oil cylinder, the guide groove which is vertical to the axial direction of the piston rod is processed on the guide block, the outer circumference of the rotating arm roller is matched with the guide groove in a rolling manner, when the piston rod stretches, the rotating arm roller is pushed or pulled to drive the rotating arm assembly to rotate around the axial direction of the driving shaft, and at the moment, the rotating arm roller rolls in the guide groove.
As a preferable scheme, the swing link assembly includes: the swing rod A, the swing rod B, the pin shaft, the roller and the bearing, wherein the arc-shaped groove on the arc-shaped groove disc is a waist-shaped groove with the width same as the outer diameter of the roller;
the swing rod A and the swing rod B are coaxially fixed at two axial ends of a pin shaft, a roller is sleeved on the pin shaft between the swing rod A and the swing rod B through a bearing, the swing rod A abuts against a shaft shoulder at the end part of the pin shaft, and the pin shaft extends out of the end part of the swing rod B to be locked and is used for axially limiting the swing rod A, the roller and the swing rod B;
the swing rod A and the swing rod B are respectively positioned on two sides of the arc groove disc, and the idler wheels are in rolling fit with kidney-shaped holes in the arc groove disc, so that when the swing rod assembly rotates around the axial direction of the driving shaft, the arc groove disc is pushed to rotate around the axial direction of the driven shaft in the opposite direction.
As a preferred scheme, an annular boss is arranged on the driving shaft and used for axially limiting the swing rod A from the right end of the swing rod A; and the left end of the swing rod B axially limits the swing rod B through a limiting nut sleeved on the driving shaft.
As a preferred scheme, opposite ends of pin shaft mounting ends of the swing rod A and the swing rod B are respectively provided with a spline through hole for being in key connection with a driving shaft mounted in the swing rod A, and the right end part of the spline through hole of the swing rod A is coaxially provided with a blind hole with a diameter larger than that of the blind hole, so that an annular boss on the driving shaft is abutted against a step surface between the blind hole and the spline through hole.
As a preferable aspect, the cylinder assembly further includes: and one end of the oil cylinder pin shaft is fixed with a piston rod of the oil cylinder, and the other end of the oil cylinder pin shaft is fixed with the guide block.
As a preferred scheme, the hook end of the hook is arc-shaped, and the inner arc surface of the hook is matched with the outer arc surface of the corresponding connecting piece on the auxiliary bridge section.
Has the advantages that:
(1) the utility model discloses a from locking-type coupling mechanism, simple structure, with low costs, occupation space are little, can reach stable auto-lock, and the unblock is convenient.
Drawings
Fig. 1 is a schematic structural view of the self-locking type connecting mechanism to be locked.
Fig. 2 is the structural schematic diagram of the self-locking type connecting mechanism for waiting to unlock state.
Fig. 3 is a schematic structural diagram of the rotating arm assembly in the self-locking connecting mechanism of the present invention.
Fig. 4 is a schematic structural diagram of the swing link assembly in the self-locking connecting mechanism of the present invention.
Fig. 5 is a schematic structural view of the oil cylinder assembly in the self-locking connecting mechanism of the present invention.
Wherein, 1-driving shaft, 2-driven shaft, 3-rotating arm component, 31-rotating arm main body, 32-rotating arm roller, 33-sliding bearing, 34-cover plate, 4-oscillating bar component, 41-oscillating bar A, 42-oscillating bar B, 43-pin shaft, 44-roller, 45-bearing, 46-nut, 5-oil cylinder component, 51-oil cylinder, 52-guide groove, 53-oil cylinder pin shaft, 6-arc groove disc, 7-hook, 8-shaft connecting plate, 9-left shaft end bracket, 10-right shaft end bracket
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings by way of examples.
Example 1:
the embodiment provides a self-locking connecting mechanism, which has the advantages of simple structure, low cost, small occupied space, stable self-locking and convenient unlocking.
As shown in fig. 1 and 2, the connection mechanism includes: the device comprises a driving shaft 1, a driven shaft 2, a rotating arm assembly 3, a swing rod assembly 4, an oil cylinder assembly 5, an arc groove disc 6, a hook 7, a shaft connecting plate 8, a left shaft end support 9 and a right shaft end support 10; the left shaft end support 9 and the right shaft end support 10 are respectively fixed on two transverse sides of a main bridge section, shaft connecting plates 8 are further fixed on two transverse sides of the main bridge section, two ends of a driving shaft 1 are respectively supported on the left shaft end support 9 and the right shaft end support 10 through bearings, the driving shaft 1 has freedom degree of rotating around the self axial direction, two ends of a driven shaft 2 are respectively supported on the two shaft connecting plates 8 through bearings, the driven shaft 2 has freedom degree of rotating around the self axial direction, and the driving shaft 1 and the driven shaft 2 are axially parallel; one end of the rotating arm component 3 and one end of the oscillating bar component 4 are respectively arranged on the driving shaft 1 through splines, more than one hook 7 is arranged on the driven shaft 2 along the axial direction of the driven shaft, an installation handle arranged on the hook 7 is arranged on the driven shaft 2 through the splines, and the hook end of the hook 7 is used for being matched with the auxiliary bridge section to hook or release the auxiliary bridge section; the arc groove plate 6 is installed on the driven shaft 2 through a spline, the other end of the swing rod assembly 4 is matched with an arc groove formed in the arc groove plate 6, the driving shaft 1 rotates, the swing rod assembly 4 drives the driven shaft 2 to rotate around the axial direction of the driven shaft through the arc groove plate 6, and the other end of the rotating arm assembly 3 is matched with the oil cylinder assembly 5 and used for converting telescopic motion of the oil cylinder assembly 5 into rotation of the rotating arm assembly 3 around the driving shaft 1.
Specifically, the method comprises the following steps:
when viewed from left to right, the counterclockwise direction is the counterclockwise direction of the connecting mechanism, and the clockwise direction is the clockwise direction of the connecting mechanism.
When the main bridge section and the auxiliary bridge section are required to be butted, the oil cylinder assembly 5 drives the rotating arm assembly 3 to rotate anticlockwise around the driving shaft 1 to drive the driving shaft 1 to rotate anticlockwise around the axial direction of the driving shaft, the driving shaft 1 rotates anticlockwise to drive the swing rod assembly 4 to rotate anticlockwise, so that the arc groove disc 6 is driven to rotate clockwise around the driven shaft 2, the clockwise rotation of the arc groove disc 6 drives the driven rotating shaft 2 and the hook 7 to rotate clockwise around the axial direction of the driven shaft 2 together until the hook end of the hook 7 hooks the corresponding connecting piece on the auxiliary bridge section, at the moment, the swing rod assembly 4 and the arc groove disc 6 roll to a mechanical dead point (the swing rod assembly 4 rolls from one end of the arc groove to the other end in the arc groove on the arc groove disc 6 to enable the end points at the two ends of the arc groove to be an end point A and an end point B, when the hook 7 is separated from the connecting piece on, when the hook 7 hooks the connecting piece on the auxiliary bridge section, the swing rod component 4 is positioned at the end point B of the arc-shaped groove on the arc-shaped groove disc 6; mechanical dead point is that end point B) of the arc wall on the arc groove dish 6 is located to pendulum rod subassembly 4 promptly), this coupling mechanism couples together main bridge festival and auxiliary bridge festival, at this moment, under the effect that does not have the external force, because pendulum rod subassembly 4 has limiting displacement to couple 7 around the anticlockwise movement of driven shaft 2 with the position relation that arc groove dish 6 is in mechanical dead point, make coupling mechanism between main bridge festival and the auxiliary bridge festival be in mechanical auto-lock state, consequently, even after rocking arm subassembly 3 and oil cylinder subassembly 5 separate, couple 7 can not turn round by oneself yet, and then coupling mechanism's stability has been guaranteed, thereby firm the connection between main bridge festival and the auxiliary bridge festival.
When needing to be with main bridge section and vice bridge section separation, oil cylinder subassembly 5 drive rocking arm subassembly 3 rotates clockwise around driving shaft 1, drive driving shaft 1 and pendulum rod subassembly 4 and revolve clockwise around the axial of driving shaft 1, and then drive arc groove dish 6 and revolve around driven shaft 2 anticlockwise thereupon, arc groove dish 6 anticlockwise gyration drives driven spindle 2 and couple 7 and revolve anticlockwise around the axial of driven shaft 2, the hook end of couple 7 is thrown off with the connecting piece on the vice bridge section, gyration to initial position, coupling mechanism opens so far, thereby drive main bridge section and vice bridge section separation.
Example 2:
on the basis of embodiment 1, the boom assembly 3 includes: a boom main shaft 31, a boom roller 32, a boom bearing 33, and a cover plate 34, and the cylinder assembly 5 includes: the rotary arm main shaft 31 is Z-shaped, one horizontal end of the rotary arm main shaft 31 is provided with a mounting hole along the axial direction of the horizontal end, the rotary arm main shaft 31 is coaxially and fixedly connected (such as connected through a key) on the driving shaft 1 through the mounting hole, the other horizontal end of the rotary arm main shaft is a mounting shaft, the rotary arm roller 32 is supported on the mounting shaft through a rotary arm bearing 33, the outer circumference of the rotary arm roller 32 is in rolling fit with the guide groove 52, and the cover plate 34 axially limits the rotary arm roller 32 and the rotary arm bearing 33 from the right end of the mounting shaft; the oil cylinder 51 is fixed on the frame, the end of the piston rod of the oil cylinder 51 is fixed with a guide block, a guide groove 52 vertical to the axis of the piston rod is processed on the guide block, the rotating arm roller 32 can roll in the guide groove 52, when the piston rod stretches, the rotating arm roller 32 is pushed or pulled to drive the rotating arm assembly 3 to rotate around the axial direction of the driving shaft 1, and in the rotating process, the rotating arm roller 32 rolls in the guide groove 52.
Example 3:
on the basis of the embodiment 1 or 2, the swing link assembly 4 includes: the swing rod A41, the swing rod B42, the pin shaft 43, the roller 44 and the bearing 45, wherein the arc-shaped groove on the arc-shaped groove disc 6 is a waist-shaped groove with the width same as the outer diameter of the roller 44;
the swing rod A41 and the swing rod B42 are coaxially fixed at two axial ends of a pin shaft 43, a roller 44 is sleeved on the pin shaft 43 between the swing rod A41 and the swing rod B42 through a bearing 45, the other side of the adjacent side of the swing rod A41 and the roller 44 is abutted against a shaft shoulder at the end part of the pin shaft 43, and the pin shaft 43 extends out of the end part of the swing rod B42 to be locked and is used for limiting the axial movement of the swing rod A41, the roller 44 and the swing rod B42; the swing rod A41 and the swing rod B42 are respectively positioned at two sides of the arc groove disc 6, the roller 44 is positioned in a waist-shaped groove on the arc groove disc 6 and is in rolling fit with the waist-shaped groove on the arc groove disc 6, and the rolling fit of the roller 44 and the waist-shaped groove on the arc groove disc 6 enables the arc groove disc 6 to be pushed to rotate in the opposite direction around the axial direction of the driven shaft 2 when the swing assembly 4 rotates around the axial direction of the driving shaft 1; opposite ends of the installation ends of the pin shafts 43 on the swing rod A41 and the swing rod B42 are respectively provided with spline through holes for being connected with a driving shaft 1 key installed in the spline through holes.
Example 4:
on the basis of the embodiment 3, the driving shaft 1 is provided with an annular boss for axially limiting the swing rod A41 from the right end of the swing rod A41; the left end of the swing rod B42 axially limits the swing rod B42 through a limit nut sleeved on the driving shaft 1, and the limit nut and the annular boss on the driving shaft 1 are used for limiting the axial movement of the swing rod assembly 4 along the driving shaft 1.
Example 5:
on the basis of embodiment 4, the right end part of the spline through hole of the swing rod A41 is coaxially provided with a blind hole with the diameter larger than that of the spline through hole, so that the annular boss on the driving shaft 1 is abutted against the step surface between the blind hole and the spline through hole, the exposed annular boss on the driving shaft 1 is reduced, and the motion interference in the motion process is reduced.
Example 6:
on the basis of embodiment 2, the cylinder assembly 5 further includes: and an oil cylinder pin shaft 53, one end of the oil cylinder pin shaft 53 is fixed with a piston rod of the oil cylinder 51, the other end of the oil cylinder pin shaft 53 is fixed with the guide block, and the oil cylinder pin shaft 53 is used for increasing the length of the piston rod and is conveniently and fixedly connected with the guide block.
Example 7:
in example 3, the end of the rod end of the pin 43 is externally threaded and fastened by a nut 46.
Example 8:
on the basis of any one of the embodiments 1 to 7, the hook end of the hook 7 is arc-shaped, and the inner arc surface of the hook is matched with the outer arc surface of the corresponding connecting piece on the auxiliary bridge section, so that the main bridge section and the auxiliary bridge section are stably connected.
In summary, the above is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A self-locking connecting mechanism, comprising: the device comprises a driving shaft (1), a driven shaft (2), a rotating arm assembly (3), a swing rod assembly (4), an oil cylinder assembly (5), an arc groove disc (6) and a hook (7);
the driving shaft (1) and the driven shaft (2) are parallel to each other, and two ends of the driving shaft and the driven shaft are supported on the main bridge section through bearings respectively;
one end of the rotating arm assembly (3) and one end of the oscillating bar assembly (4) are respectively fixed on the driving shaft (1), more than one hook (7) is arranged on the driven shaft (2) along the axial direction of the driven shaft, and the hook end of the driven shaft is matched with the auxiliary bridge section; the arc groove disc (6) is fixed on the driven shaft (2), an arc groove is formed in the arc groove disc (6), the other end of the swing rod assembly (4) is matched with the arc groove of the arc groove disc (6), when the driving shaft (1) rotates, the swing rod assembly (4) pushes the arc groove disc (6) to drive the driven shaft (2) to rotate around the axial direction of the driven shaft, meanwhile, the swing rod assembly moves in the arc groove of the arc groove disc (6), when the swing rod assembly moves to the end portion of the arc groove, a mechanical dead point is formed to achieve self-locking, at the moment, the driven shaft (2) rotates in place, and the hook end of the hook (7) hooks the auxiliary bridge section; the other end of the rotating arm component (3) is matched with the oil cylinder component (5) and is used for converting the telescopic motion of the oil cylinder component (5) into the rotation of the rotating arm component (3) around the driving shaft (1).
2. Self-locking connecting mechanism according to claim 1, characterized in that the swivel arm assembly (3) comprises: rocking arm main shaft (31), rocking arm gyro wheel (32), rocking arm bearing (33) and apron (34), oil cylinder subassembly (5) include: an oil cylinder (51) and a guide groove (52);
the rotating arm main shaft (31) is Z-shaped, a mounting hole is axially formed in one horizontal end of the rotating arm main shaft (31) along the horizontal end, the rotating arm main shaft (31) is fixed on the driving shaft (1) through the mounting hole, the other horizontal end of the rotating arm main shaft is a mounting shaft, the rotating arm roller (32) is supported on the mounting shaft through a rotating arm bearing (33), and the cover plate (34) axially limits the rotating arm roller (32) and the rotating arm bearing (33) from the right end of the mounting shaft;
the oil cylinder (51) is fixed on the rack, a guide block is fixed at the end part of a piston rod of the oil cylinder (51), the guide groove (52) which is vertical to the axial direction of the piston rod is processed on the guide block, the outer circumference of the rotating arm roller (32) is matched with the guide groove (52) in a rolling manner, when the piston rod stretches, the rotating arm roller (32) is pushed or pulled to drive the rotating arm assembly (3) to rotate around the axial direction of the driving shaft (1), and at the moment, the rotating arm roller (32) rolls in the guide groove (52).
3. The self-locking connecting mechanism according to claim 1 or 2, characterized in that the pendulum assembly (4) comprises: the swing rod A (41), the swing rod B (42), the pin shaft (43), the roller (44) and the bearing (45), wherein the arc-shaped groove on the arc-shaped groove disc (6) is a waist-shaped groove with the width being the same as the outer diameter of the roller (44);
the swing rod A (41) and the swing rod B (42) are coaxially fixed at two axial ends of a pin shaft (43), a roller (44) is sleeved on the pin shaft (43) between the swing rod A (41) and the swing rod B (42) through a bearing (45), the swing rod A (41) abuts against a shaft shoulder at the end part of the pin shaft (43), and the pin shaft (43) extends out of the end part of the swing rod B (42) to be locked and is used for axially limiting the swing rod A (41), the roller (44) and the swing rod B (42);
the swing rod A (41) and the swing rod B (42) are respectively positioned on two sides of the arc groove disc (6), and the roller (44) is in rolling fit with a kidney-shaped hole in the arc groove disc (6) so that the arc groove disc (6) is pushed to rotate in the opposite direction around the axial direction of the driven shaft (2) when the swing rod assembly (4) rotates around the axial direction of the driving shaft (1).
4. The self-locking connecting mechanism according to claim 3, wherein the driving shaft (1) is provided with an annular boss for axially limiting the swing rod A (41) from the right end of the swing rod A (41); the left end of the swing rod B (42) axially limits the swing rod B (42) through a limiting nut sleeved on the driving shaft (1).
5. The self-locking connecting mechanism according to claim 4, wherein the opposite ends of the mounting ends of the pin shafts (43) on the swing link A (41) and the swing link B (42) are respectively provided with a spline through hole for being in key connection with the driving shaft (1) mounted therein, and the right end part of the spline through hole of the swing link A (41) is coaxially provided with a blind hole with a diameter larger than that of the blind hole, so that the annular boss on the driving shaft (1) is abutted against the step surface between the blind hole and the spline through hole.
6. The self-locking connecting mechanism according to claim 2, wherein the cylinder assembly (5) further comprises: and one end of the oil cylinder pin shaft (53) is fixed with a piston rod of the oil cylinder (51), and the other end of the oil cylinder pin shaft (53) is fixed with the guide block.
7. Self-locking connecting mechanism according to claim 1, characterised in that the hook end of the hook (7) is arc-shaped, the intrados of which co-operates with the extrados of the corresponding connecting piece on the secondary bridge segment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921367632.6U CN211285225U (en) | 2019-08-22 | 2019-08-22 | Self-locking type connecting mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921367632.6U CN211285225U (en) | 2019-08-22 | 2019-08-22 | Self-locking type connecting mechanism |
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| Publication Number | Publication Date |
|---|---|
| CN211285225U true CN211285225U (en) | 2020-08-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921367632.6U Active CN211285225U (en) | 2019-08-22 | 2019-08-22 | Self-locking type connecting mechanism |
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| Country | Link |
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| CN (1) | CN211285225U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110541348A (en) * | 2019-08-22 | 2019-12-06 | 中国船舶重工集团应急预警与救援装备股份有限公司 | Self-locking type connecting mechanism |
-
2019
- 2019-08-22 CN CN201921367632.6U patent/CN211285225U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110541348A (en) * | 2019-08-22 | 2019-12-06 | 中国船舶重工集团应急预警与救援装备股份有限公司 | Self-locking type connecting mechanism |
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