CN108155050B - Operating shaft interlocking device for load switch - Google Patents
Operating shaft interlocking device for load switch Download PDFInfo
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- CN108155050B CN108155050B CN201810161751.XA CN201810161751A CN108155050B CN 108155050 B CN108155050 B CN 108155050B CN 201810161751 A CN201810161751 A CN 201810161751A CN 108155050 B CN108155050 B CN 108155050B
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- interlocking
- shaft
- interlocking plate
- operation shaft
- plate
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- 230000005540 biological transmission Effects 0.000 claims description 6
- 230000033001 locomotion Effects 0.000 claims description 6
- 230000000903 blocking effect Effects 0.000 abstract description 2
- 238000009434 installation Methods 0.000 abstract description 2
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 238000002955 isolation Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H31/00—Air-break switches for high tension without arc-extinguishing or arc-preventing means
- H01H31/02—Details
- H01H31/04—Interlocking mechanisms
- H01H31/08—Interlocking mechanisms for interlocking two or more parts of the mechanism for operating contacts
Abstract
The invention relates to an operation shaft interlocking device, which realizes the locking of an operation shaft by blocking an operation hole or closing an installation path of an operation wrench in a mode that an operation shaft drives an interlocking plate; meanwhile, in a further technical scheme, through setting the first, second and third interlocking plates and controlling the interlocking sequence of the three interlocking plates, the three operation shaft interlocking rings are buckled, so that misoperation is avoided, and the triaxial interlocking device of the high-voltage load switch is simple in structure, reliable in operation and convenient to operate.
Description
Technical Field
The invention belongs to the technical field of high-voltage switch equipment, and particularly relates to an operation shaft interlocking device for multi-operation shaft five-prevention interlocking control.
Background
The group transmission and distribution electrical equipment (high-voltage switch equipment) is electrical equipment which is arranged in a metal or nonmetal insulation cabinet body or is made into an assembled interval type looped network power supply unit, and the core part of the group transmission and distribution electrical equipment adopts a breaker or a load switch, a disconnecting switch, a grounding switch load switch and a fuse, and has the advantages of simple structure, small volume, low price, capability of improving power supply parameters and performance, power supply safety and the like. It is widely used in distribution stations of load centers such as urban residential communities, high-rise buildings, large public buildings, factory enterprises and the like, and box-type substations.
The sequence of operation of the high voltage switch is subject to stringent requirements,
power-off sequence: the load switch is switched off, the isolating switch is switched off, and the grounding switch is switched on; power transmission sequence: the grounding switch is switched off, the isolating switch is switched on, and the load switch is switched on; breaking the control sequence, the equipment is damaged lightly, and the operator is injured heavily.
In the prior art, mutual limiting is adopted in the current market, misoperation is prevented by means of mechanical strength, but the triaxial interlocking device is poor in reliability, easy to cause misoperation, easy to cause safety accidents, complex in structure, low in process complex assembly efficiency and high in cost.
Disclosure of Invention
The invention aims to provide an operation shaft interlocking device for a load switch, which solves the problems that the prior high-voltage switch sequence control mechanism is poor in reliability and easy to cause misoperation.
The specific scheme is as follows: an operation shaft interlocking device for a load switch comprises an operation mechanism, wherein the operation mechanism is provided with a first operation shaft for operating the disconnection switch and a second operation shaft for operating the disconnection switch;
the operating mechanism is also movably provided with a first interlocking plate and a second interlocking plate: the upper end of the first interlocking plate is arranged at a position close to the first operation shaft, and the second interlocking plate is arranged at a position close to the second operation shaft;
the second interlocking plate can move towards the second operation shaft to close the second operation shaft; the first interlock plate is elastically fixed to its initial position; the locking crank arm is fixed on a closing maintaining shaft of the load switch, the lower end of the first interlocking plate and the second interlocking plate respectively abut against two ends of the locking crank arm to realize reverse linkage, and the first interlocking plate can move upwards under the driving of the locking crank arm to seal the first operating shaft;
the first operation shaft is provided with a driving part which can be in transmission connection with the first interlocking plate and is used for pressing down the first interlocking plate, and the second interlocking plate is pushed away from the second operation shaft through the locking crank arm.
Further, the operating mechanism further comprises a third operating shaft for operating the grounding switch to be opened and closed, and the operating mechanism is further movably provided with a third interlocking plate;
the third interlocking plate is elastically fixed at an initial position, and two ends of the third interlocking plate extend to positions close to the first operation shaft and the third operation shaft respectively; the first and third operating shafts are respectively provided with a first cam and a third cam, so that the third interlocking plate is driven to move through the first cam and the third cam, and one of the first operating shaft and the third operating shaft is closed, and the other is closed.
Further, the operating mechanism comprises an operating panel and an interlocking panel, the operating panel is arranged on the interlocking panel, the first, second and third interlocking plates are arranged between the operating panel and the interlocking panel, and the first, second and third operating shafts are arranged on one side of the interlocking panel, which is away from the operating panel; the operation panel is provided with a first operation hole, a second operation hole and a third operation hole at positions corresponding to the first operation shaft, the second operation shaft and the third operation shaft.
Further, the first, second and third operation shafts are sequentially arranged from top to bottom, and the first, second and third interlocking plates are arranged on the interlocking panel;
the upper end and the lower end of the third interlocking plate are respectively provided with a first compression bar and a second compression bar which penetrate through the interlocking panel corresponding to the positions of the first cam and the third cam;
the lower ends of the first interlocking plate and the second interlocking plate are respectively provided with a first contact rod and a second contact rod which penetrate through the interlocking panel at positions corresponding to the locking crank arms.
Further, the operating mechanism is provided with a first chute, a second chute and a third chute, and the first, second and third interlocking plates are respectively movably arranged in the first chute, the second chute and the third chute.
Further, the elastic component comprises two elastic pieces with opposite acting forces, wherein the elastic piece comprises a first elastic piece and a second elastic piece; the first and third interlocking plates are elastically fixed in the first and third sliding grooves respectively through an elastic component;
the second interlocking plate is provided with a second operation shaft, and the second interlocking plate is provided with a second elastic piece which is arranged on the operation mechanism and acts on the second interlocking plate to apply a force towards the second operation shaft.
Further, the driving part is a crank arranged on the first operation shaft.
Further, the control device also comprises a second display plate, wherein the second display plate is arranged on a closing maintaining shaft of the load switch, and a second observation window is arranged at a position, corresponding to the movement track of the second display plate, on the control mechanism.
Further, the first and third operation shafts are respectively provided with a first and third display panel, and the operation mechanism is also respectively provided with a first and third observation window at the position corresponding to the movement track of the first and third display panels.
The beneficial effects are that: according to the operation shaft interlocking device, the mode of shielding the operation hole or closing the installation path of the operation wrench is realized by driving the interlocking plate by the operation shaft, so that the operation shaft is locked, compared with the traditional locking mode, the action force cannot be applied after the interlocking, the problem that the interlocking mechanism is forcibly damaged by misoperation is avoided, the mechanism reliability is high, and the problem of misoperation is avoided; meanwhile, in a further technical scheme, through setting the first, second and third interlocking plates and controlling the interlocking sequence of the three interlocking plates, the three operation shaft interlocking rings are buckled, so that misoperation is avoided, and the triaxial interlocking device of the high-voltage load switch is simple in structure, reliable in operation and convenient to operate.
Drawings
FIG. 1 shows a schematic diagram of an embodiment of the present invention;
FIG. 2 shows an exploded view of FIG. 1;
FIG. 3 shows another angular exploded view of FIG. 1;
FIG. 4 shows a schematic view of the structure of FIG. 1 with the operator panel removed;
FIG. 5 shows a rear view of the brake release state of FIG. 1;
FIG. 6 illustrates a rear view of the third operating shaft of FIG. 1 in a closed state;
FIG. 7 illustrates a rear view of the second operating shaft of FIG. 1 in a closed state;
fig. 8 shows a rear view of the first and third operating shafts of fig. 1 in a closed state.
Detailed Description
For further illustration of the various embodiments, the invention is provided with the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments and together with the description, serve to explain the principles of the embodiments. With reference to these matters, one of ordinary skill in the art will understand other possible embodiments and advantages of the present invention. The components in the figures are not drawn to scale and like reference numerals are generally used to designate like components.
The invention will now be further described with reference to the drawings and detailed description.
As shown in fig. 1 to 4, this embodiment provides an operation shaft interlocking device for a load switch, comprising an operation mechanism which is mounted on a high-voltage load switch and which has a first operation shaft 6, a second operation shaft 11, and a third operation shaft 8 arranged in this order from top to bottom; in this embodiment, the first operating shaft 6 is drivingly connected to the isolating switch of the load switch for operating the isolating switch to be opened and closed, and likewise, the second operating shaft 11 and the third operating shaft 8 are drivingly connected to the load switch and the grounding switch, respectively, for controlling the opening and closing operations of the load switch and the grounding switch.
In this embodiment, the main body of the operating mechanism is a frame structure, and includes an operating panel 1 and an interlocking panel 2, the operating panel 1 is mounted on the interlocking panel 2 in parallel, the first, second and third operating shafts 6, 11, 8 are respectively disposed on one side of the interlocking panel 2 facing away from the operating panel 1, and the operating panel 1 is respectively provided with a first operating hole, a second operating hole and a third operating hole corresponding to the first, second and third operating shafts 6, 11, 8 for exposing the three operating shafts to mount the socket wrench thereon; wherein the outer ends of the first, second and third operation shafts 6, 11, 8 penetrate through the interlocking panel 2 and protrude between the operation panel 1 and the interlocking panel 2.
The first interlocking plate 16, the second interlocking plate 15 and the third interlocking plate 14 are further arranged between the interlocking plates 2 of the operation panel 1:
the first, second and third sliding grooves extending in the vertical direction are respectively arranged on the interlocking panel 2, and the first, second and third interlocking plates 16, 15 and 14 are respectively movably arranged in the first, second and third sliding grooves through two guiding sliding rods so as to be mounted on the interlocking panel 2; the first, second and third operation shafts 6, 11, 8 are all arranged in sequence from top to bottom in the vertical direction, and the second operation shaft 11 moves outwards in the horizontal position; it is thereby achieved that the first 16, second 15 and third 14 interlock plates can be moved in position between the first, second and third operating shafts 6, 11, 8.
In this embodiment, the first interlock plate 16 and the third interlock plate 14 are resiliently secured within the first and third runners, defining the position as the initial position of both; the upper end of the first interlocking plate 16 is arranged at a position close to the first operation shaft 6, and the upper end and the lower end of the third interlocking plate 14 respectively extend to a position close to the first operation shaft 6 and the third operation shaft 8; in addition, the second sliding groove is disposed vertically above the second operation shaft 11, i.e., the second interlock plate 15 is disposed above the second operation shaft 11 and near the second operation shaft 11.
In this embodiment, the operating mechanism further comprises a locking lever 13, and the locking lever 13 is fixed on the closing maintaining shaft 12 of the load switch and can rotate along with the closing maintaining shaft 12; the lower end of the first interlocking plate 16 and the lower end of the second interlocking plate 15 respectively abut against two ends of the locking crank arm 13, so that the two can be reversely linked when the closing holding shaft 12 rotates.
In this embodiment, the first interlocking plate 16, the second interlocking plate 15, and the third interlocking plate 14 are all elastically fixed in their initial positions:
specifically, two groups of two elastic components are also fixed on the outer side of the interlocking panel 2: each elastic component comprises two tension springs serving as a first elastic piece and a second elastic piece, the fixed ends of the two tension springs are identical, and the free ends of the tension springs are reversely arranged, so that the opposite acting forces of the tension springs are realized; the first interlocking plate 16 and the third interlocking plate 14 are respectively elastically fixed in the first sliding groove and the third sliding groove by a group of elastic components, and in the initial position, no internal tension exists between the two tension springs of the elastic components, and only the dead weight of the interlocking plates is needed to be balanced.
The interlocking panel 2 is further provided with a third elastic member, which is also a tension spring, acting on the second interlocking plate 15 to apply a pull-down force to the second interlocking plate 15 to drive it to move toward the second operating shaft 11.
The first operating shaft 6 and the third operating shaft 8 are respectively provided with a first cam and a third cam, wherein the first cam is an isolating cam 19, and the third cam is a ground knife cam 10; the upper and lower ends of the third interlocking plate 14 are respectively provided with a first compression bar and a second compression bar penetrating through the interlocking panel 2 corresponding to the positions of the isolation cam 19 and the ground knife cam 10, and then the third interlocking plate 14 is driven to move up and down through the isolation cam 19 and the ground knife cam 10, so that one of the first operation shaft and the third operation shaft is closed, and a socket wrench cannot be installed, namely cannot be operated.
In a free state, the second interlocking plate 15 moves downwards under the action of the tension spring and can move towards the second operation shaft 11 so as to seal the second operation shaft 11, so that a socket wrench cannot be installed and cannot rotate; the lower ends of the first interlocking plate 16 and the second interlocking plate 15 are respectively provided with a first contact rod and a second contact rod penetrating through the interlocking panel 2 and corresponding to the position of the locking crank arm 13 so as to be used for abutting against the locking crank arm 13.
Meanwhile, a driving part which can be in transmission connection with the upper end of the first interlocking plate 16 is arranged on the first operation shaft 6, in this embodiment, the driving part is a crank arranged on the first operation shaft 6, preferably, an isolating limit cam 9 is used for pressing down the first interlocking plate 16 in a closing state, and the second interlocking plate 15 is pushed away from the second operation shaft 11 through the locking crank arm 13, so that the release of the second operation shaft 11 is realized; after the second operation shaft 11 is switched on, the locking crank arm 13 rotates, and the first interlocking plate 16 is propped up, so that the first operation shaft 6 can be locked.
Referring again to fig. 5 to 8, the operating shaft interlocking device operates as follows:
in the disconnecting state of the isolating switch, the limit cam 9 presses down the upper end of the first interlocking plate 16, which drives the first interlocking plate 16 to move downwards, the initial position of the first interlocking plate 16 is arranged at a position close to the second operation shaft 11, and then the lower end of the first interlocking plate 16 moves downwards to shield the second operation hole. At this time, the isolation cam 19 is not pressed to the upper end of the third interlocking plate 14, the lower end of the third interlocking plate 14 is opened by the third operation hole 5, the third operation shaft 8 is operated clockwise, the grounding switch is closed, the grounding knife cam 10 on the third operation shaft presses the pin on the third interlocking plate 14 upwards, the pin drives the third interlocking plate 14 to move upwards, the upper end of the third interlocking plate 14 shields the first operation hole 3, and the closing of the grounding switch and the locking of the isolation switch are completed;
under the earthing switch separating brake state, the ground knife cam 10 on the third operating shaft 8 does not act on the third interlocking plate 14, the third interlocking plate 14 is reset automatically under the effect of extension spring, the first operating hole 3 is yielded to the upper end of the third interlocking plate 14, the first operating shaft 6 is operated clockwise, the isolating switch is closed, the isolating cam 19 on the first operating shaft 6 presses down the upper end of the third interlocking plate 14, the third interlocking plate 14 is driven to move downwards, the lower end of the third interlocking plate 14 shields the third operating hole, meanwhile, the limiting cam 9 is separated from the upper end of the first interlocking plate 16, the first interlocking plate 16 is reset under the effect of extension spring, the first interlocking plate 16 moves upwards, and the lower end of the first interlocking plate 1616 yields the second operating hole 4.
The grounding switch is opened, the second operation shaft 11 is operated clockwise under the closing state of the isolating switch, the load switch in the operation box is driven to be closed, the closing maintaining shaft 12 on the operation mechanism drives the locking crank arm 13, the locking crank arm 13 drives the first interlocking plate 16 to move upwards, the upper end of the first interlocking plate 16 shields the first operation hole, meanwhile, the second interlocking plate 15 moves downwards under the action of the reset spring, and the lower end of the second interlocking plate 15 shields the second operation hole 4.
In the closing state of the load switch, a brake release button on the panel is pressed, an operating mechanism in the operating box is driven to release the load switch, a brake release maintaining shaft 12 on the operating mechanism drives a locking crank arm 13, and the locking crank arm 13 drives a second interlocking plate 15 to move upwards, so that the lower end of the second interlocking plate 15 is free of a second operating hole 4. The first interlocking plate 16 moves under the action of the tension spring, and the upper end of the first interlocking plate 16 is away from the first operation hole 3.
In this embodiment, the operating mechanism further includes a second display panel, the second display panel is disposed on the closing maintaining shaft 12 of the load switch, and a second observation window is disposed on the operating mechanism at a position corresponding to the movement track of the second display panel; meanwhile, the first operating shaft 6 and the third operating shaft 8 are respectively provided with a first display board and a third display board, and the operating mechanism is also respectively provided with a first observation window and a third observation window at positions corresponding to the movement tracks of the first display board and the third display board, so as to be used for observing the opening and closing states of the gate during the period.
In the embodiment, two tension springs are adopted to automatically reset the third interlocking plate 14 without external force, the structure is simple, and the cam mechanism is used for controlling the stroke of the third interlocking plate 14; the grounding switch and the isolating switch are separated, and the two operations are suspended and can be operated; the cam idle stroke rotates one of the cam idle strokes, and the other one of the blocking holes is pressed downwards under the condition of rotating the cam idle stroke by a certain angle; can operate in both states; the load-opening-associated lock plate of the isolating switch is automatically reset without cam action by adopting two tension springs, and the structure is simple.
While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. An operating shaft interlocking device for a load switch, comprising an operating mechanism, wherein the operating mechanism is provided with a first operating shaft for operating the disconnection switch and a second operating shaft for operating the disconnection switch, and the operating shaft interlocking device is characterized in that:
the operating mechanism is also movably provided with a first interlocking plate and a second interlocking plate: the upper end of the first interlocking plate is arranged at a position close to the first operation shaft, and the second interlocking plate is arranged at a position close to the second operation shaft;
the second interlocking plate can move towards the second operation shaft to close the second operation shaft; the first interlock plate is elastically fixed to its initial position; the locking crank arm is fixed on a closing maintaining shaft of the load switch, the lower end of the first interlocking plate and the second interlocking plate respectively abut against two ends of the locking crank arm to realize reverse linkage, and the first interlocking plate can move upwards under the driving of the locking crank arm to seal the first operating shaft;
the first operation shaft is provided with a driving part which can be in transmission connection with the first interlocking plate and is used for pressing down the first interlocking plate, and the second interlocking plate is pushed away from the second operation shaft through the locking crank arm;
the operating mechanism also comprises a third operating shaft for operating the grounding switch to be opened and closed, and a third interlocking plate is movably arranged on the operating mechanism; the third interlocking plate is elastically fixed at an initial position, and two ends of the third interlocking plate extend to positions close to the first operation shaft and the third operation shaft respectively; a first cam and a third cam are respectively arranged on the first operation shaft and the third operation shaft so as to drive the third interlocking plate to move through the first cam and the third cam, and one of the first operation shaft and the third operation shaft is closed, and the other is closed;
the control mechanism comprises an operation panel and an interlocking panel, wherein the operation panel is arranged on the interlocking panel, the first interlocking plate, the second interlocking plate and the third interlocking plate are arranged between the operation panel and the interlocking panel, and the first operation shaft, the second operation shaft and the third operation shaft are arranged on one side, away from the operation panel, of the interlocking panel; the operation panel is provided with a first operation hole, a second operation hole and a third operation hole at positions corresponding to the first operation shaft, the second operation shaft and the third operation shaft.
2. The operating shaft interlocking device for a load switch according to claim 1, wherein: the first operation shaft, the second operation shaft and the third operation shaft are sequentially arranged from top to bottom, and the first interlocking plate, the second interlocking plate and the third interlocking plate are all arranged on the interlocking panel;
the upper end and the lower end of the third interlocking plate are respectively provided with a first pressing rod and a second pressing rod which penetrate through the interlocking panel corresponding to the positions of the first cam and the third cam;
the lower ends of the first interlocking plate and the second interlocking plate are respectively provided with a first contact rod and a second contact rod which penetrate through the interlocking panel at positions corresponding to the locking crank arms.
3. The operating shaft interlocking device for a load switch according to claim 1, wherein: the control mechanism is provided with a first chute, a second chute and a third chute, and the first interlocking plate, the second interlocking plate and the third interlocking plate are respectively movably arranged in the first chute, the second chute and the third chute.
4. The operating shaft interlocking device for a load switch according to claim 3, characterized in that: the elastic component comprises a first elastic piece and a second elastic piece with opposite acting forces; the first interlocking plate and the third interlocking plate are respectively and elastically fixed in the first chute and the third chute through an elastic component;
the second interlocking plate is provided with a second operation shaft, and the second interlocking plate is provided with a second elastic piece which is arranged on the operation mechanism and acts on the second interlocking plate to apply a force towards the second operation shaft.
5. The operating shaft interlocking device for a load switch according to claim 1, wherein: the driving part is a crank arranged on the first operation shaft.
6. The operating shaft interlocking device for a load switch according to any one of claims 1 to 5 characterized in that: the second display board is arranged on the closing maintaining shaft of the load switch and is provided with
The control mechanism is provided with a second observation window at a position corresponding to the motion track of the second display panel.
7. The operating shaft interlocking device for a load switch according to any one of claims 2 to 5 characterized in that: the first operation shaft and the third operation shaft are respectively provided with a first display plate and a third display plate, and the position of the operating mechanism corresponding to the movement track of the first display plate and the third display plate is also respectively provided with a first observation window and a third observation window.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810161751.XA CN108155050B (en) | 2018-02-26 | 2018-02-26 | Operating shaft interlocking device for load switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810161751.XA CN108155050B (en) | 2018-02-26 | 2018-02-26 | Operating shaft interlocking device for load switch |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108155050A CN108155050A (en) | 2018-06-12 |
| CN108155050B true CN108155050B (en) | 2024-04-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810161751.XA Active CN108155050B (en) | 2018-02-26 | 2018-02-26 | Operating shaft interlocking device for load switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108155050B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101557080A (en) * | 2009-05-18 | 2009-10-14 | 宁波天安（集团）股份有限公司 | Interlocking operating device used for high voltage switch cabinet |
| CN106449233A (en) * | 2016-11-16 | 2017-02-22 | 协成科技股份有限公司 | Triaxial interlocking device of high-voltage load switch and operation method of triaxial interlocking device of high-voltage load switch |
| CN207883590U (en) * | 2018-02-26 | 2018-09-18 | 厦门市凯禹开关有限公司 | A kind of on-load switch operation axle link lock device |
-
2018
- 2018-02-26 CN CN201810161751.XA patent/CN108155050B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101557080A (en) * | 2009-05-18 | 2009-10-14 | 宁波天安（集团）股份有限公司 | Interlocking operating device used for high voltage switch cabinet |
| CN106449233A (en) * | 2016-11-16 | 2017-02-22 | 协成科技股份有限公司 | Triaxial interlocking device of high-voltage load switch and operation method of triaxial interlocking device of high-voltage load switch |
| CN207883590U (en) * | 2018-02-26 | 2018-09-18 | 厦门市凯禹开关有限公司 | A kind of on-load switch operation axle link lock device |
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| Publication number | Publication date |
|---|---|
| CN108155050A (en) | 2018-06-12 |
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