CN211294896U - Large-torque three-station electric mechanism - Google Patents
Large-torque three-station electric mechanism Download PDFInfo
- Publication number
- CN211294896U CN211294896U CN202020319639.7U CN202020319639U CN211294896U CN 211294896 U CN211294896 U CN 211294896U CN 202020319639 U CN202020319639 U CN 202020319639U CN 211294896 U CN211294896 U CN 211294896U
- Authority
- CN
- China
- Prior art keywords
- transmission
- roller
- driving plate
- output
- torque
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000007246 mechanism Effects 0.000 title claims abstract description 26
- 230000005540 biological transmission Effects 0.000 claims abstract description 65
- 230000009471 action Effects 0.000 claims abstract description 13
- 238000012806 monitoring device Methods 0.000 claims abstract description 8
- 235000001674 Agaricus brunnescens Nutrition 0.000 claims description 6
- 238000006073 displacement reaction Methods 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 claims description 2
- 238000009434 installation Methods 0.000 abstract description 6
- 125000006850 spacer group Chemical group 0.000 description 13
- 230000033001 locomotion Effects 0.000 description 8
- 238000002955 isolation Methods 0.000 description 7
- 238000006467 substitution reaction Methods 0.000 description 3
- 230000003139 buffering effect Effects 0.000 description 2
- 244000309464 bull Species 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 235000012046 side dish Nutrition 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Landscapes
- Transmission Devices (AREA)
- Gear Transmission (AREA)
Abstract
The utility model provides a large-torque three-station electric mechanism, which relates to the field of combined electrical appliances, wherein a power input assembly, a transmission assembly and an output assembly are arranged on a framework, and the power input assembly is connected with the output assembly through the transmission assembly; the power input assembly comprises a motor, a transmission lead screw, a transmission nut and a roller, wherein the output end of the motor is connected with the transmission lead screw, the transmission nut is meshed with the transmission lead screw, the transmission nut is provided with an installation column, and the roller is installed on the installation column; the power input assembly is provided with a monitoring device, and the monitoring device comprises a travel switch, a switch mounting plate and a switch action plate; the transmission assembly comprises a driving plate, a driving plate shaft and a large gear, the driving plate and the large gear are installed on the driving plate shaft, and a driving groove matched with the roller is formed in the driving plate; the output assembly comprises an output gear, and the output gear is meshed with the large gear. The mechanical locking structure of the scheme is compact, the output torque is large, and the problem that the motor is burnt due to clamping stagnation of the switch body can be solved.
Description
Technical Field
The utility model belongs to the combined electrical apparatus field, concretely relates to three station electric machanisms of big moment of torsion.
Background
In recent years, with the development of gas insulated metal switchgear, especially in a 126kV common box GIS, a three-station isolation grounding switch has been increasingly adopted by various manufacturers, due to its advantages of small size, compact structure, high complexity, flexible and various configurations, and capability of realizing mechanical interlocking of the isolation switch and the grounding switch, thereby improving reliability.
However, the operating mechanism of the currently used three-position isolating grounding switch has poor reliability and high failure rate. The torque of the three-station isolation grounding switch is increased after the three-station isolation grounding switch is used for many years, and the phenomenon that a three-station mechanism cannot drive the switch often occurs, so that the progress of electric power construction is influenced, and the safety of personnel is influenced in severe cases. Obviously, new technical means are needed to solve the problem.
SUMMERY OF THE UTILITY MODEL
The aforesaid to prior art is not enough, the utility model provides a three station electric machanism of big moment of torsion to solve above-mentioned technical problem.
The utility model provides a large-torque three-station electric mechanism, which comprises a machine frame, a power input assembly, a transmission assembly and an output assembly, wherein the power input assembly, the transmission assembly and the output assembly are arranged on the machine frame, and the power input assembly is connected with the output assembly through the transmission assembly; the power input assembly comprises a motor, a transmission screw rod, a transmission nut and a roller, wherein the output end of the motor is connected with the transmission screw rod, the transmission nut is meshed with the transmission screw rod, the transmission nut is provided with an installation column, and the roller is installed on the installation column; the transmission assembly comprises a driving plate, a driving plate shaft and a large gear, the driving plate and the large gear are installed on the driving plate shaft, a driving groove matched with the roller is formed in the driving plate, and the distance between the outer edge of the driving groove and the axis of the driving plate shaft is larger than or equal to the distance between the transmission screw rod and the axis of the driving plate shaft; the output assembly comprises an output gear, and the output gear is meshed with the large gear.
Furthermore, a threaded hole is formed in the middle of the transmission nut, and the mounting column is located in the direction perpendicular to the threaded hole.
Furthermore, the mounting column comprises a long column and a short column, the rollers comprise a large roller and a small roller, the long column is provided with the large roller and the small roller, the short column is provided with the two small rollers, and the small rollers are fixed through elastic check rings for shafts.
Further, the driving plates comprise two driving plates, wherein the driving plate close to the large gear side is matched with the large roller on the long column, and the driving plate far from the large gear side is matched with the small roller of the short column.
Furthermore, the drive plate is of a mushroom-shaped structure, the drive groove is located between the mushroom cap structure and the mushroom stem structure, and the edge of the mushroom stem structure, which is in contact with the roller, and the axis of the transmission screw form an included angle of 1-2 degrees.
Further, last tapered roller bearing, baffle, dish spring and the retaining ring of installing of drive screw, tapered roller bearing is located drive screw's tip, the baffle is adjacent with tapered roller bearing, the retaining ring includes little retaining ring and big retaining ring, little retaining ring is located and keeps away from motor one side, big retaining ring is located and is close to motor one side, the dish spring be located the baffle respectively with between the little retaining ring and the baffle with between the big retaining ring, drive nut is adjacent with big retaining ring.
Further, the power input subassembly is provided with monitoring devices, monitoring devices includes travel switch, switch mounting panel and switch action board, travel switch passes through the fix with screw on the switch mounting panel, the switch mounting panel passes through the fix with screw on the framework, the switch action board is installed on drive nut, travel switch monitors switch action board position to the position of monitoring drive nut.
Furthermore, a bearing, a small spacer bush, a driving plate, a large spacer bush, a driving plate, a small spacer bush, a bearing, a middle spacer bush and a large gear are sequentially arranged on the driving plate shaft, axial displacement of parts on the shaft is limited at two ends through elastic check rings for the shaft, and displacement of the bearings at the two ends is limited through a pressing plate fixed on the framework.
Furthermore, one end of the output gear is mounted on a bearing in the machine frame, the other end of the output gear is mounted on a bearing in the gear seat, and the gear seat is fixed on the machine frame through a screw.
The beneficial effects of the utility model reside in that, the utility model provides a pair of three station electric mechanism of big moment of torsion, compact structure, it is concrete, when drive nut along drive screw linear motion, the roller can insert in the drive groove of drive plate, makes the rotatory drive gear wheel rotation of drive plate, and the output of moment is carried out in the rotation of rethread bull gear and output gear.
In addition, the distance between the outer edge of the driving groove of the driving plate and the axis is larger than or equal to the distance between the transmission screw rod and the axis, so that the driving plate and the roller on the transmission nut are matched to form a mechanical lock, and the isolation side and the grounding side can not be switched on simultaneously from the mechanical aspect.
The electric mechanism has compact structure, safety and reliability, simple processing technology of the mechanism frame and low production cost; the stroke of the transmission nut is large, the output gear has low output rotating speed and large output torque while meeting the switching-on and switching-off time requirement, and the problem of motor burning caused by clamping stagnation of the three-position switch body can be effectively solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of the main structure of the present invention;
FIG. 2 is a schematic sectional view A-A of FIG. 1;
FIG. 3 is a schematic cross-sectional view B-B of FIG. 1;
FIG. 4 is a schematic view of FIG. 1 taken along line C;
FIG. 5 is a schematic front view of the drive nut;
FIG. 6 is a schematic top view of the drive nut;
FIG. 7 is a left side schematic view of the drive nut;
fig. 8 is a schematic view of the main structure of the utility model when the ground side is switched on;
fig. 9 is the schematic diagram of the main structure of the utility model when closing the switch on the isolation side.
Fig. 10 is a schematic diagram of the driving plate structure of the present invention.
In the figure, 1, a mechanism frame, 2, a bearing seat, 3, a tapered roller bearing, 4, a baffle plate, 5, a small retainer ring, 6, a travel switch, 7, a switch mounting plate, 8, a transmission nut, 9, a switch action plate, 10, a large retainer ring, 11, a disc spring, 12, a transmission lead screw, 13, a motor, 14, a coupler, 15, a mounting plate, 16, a spacer bush, 17, a large gear, 18, a middle spacer bush, 19, a driving plate shaft, 20, a bearing, 21, a small spacer bush, 22, a pressing plate, 23, a driving plate, 24, a large spacer bush, 25, a small roller, 26, a large roller, 27, an output gear, 28 and a gear seat.
Detailed Description
In order to make the technical solutions in the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.
A large-torque three-station electric mechanism comprises a machine frame 1, a power input assembly, a transmission assembly and an output assembly, wherein the power input assembly, the transmission assembly and the output assembly are arranged on the machine frame 1, and the power input assembly is connected with the output assembly through the transmission assembly; the power input assembly comprises a motor 13, a transmission screw rod 12, a transmission nut 8 and a roller, the output end of the motor 13 is connected with the transmission screw rod 12, the transmission nut 8 is meshed with the transmission screw rod 12, a mounting column is arranged on the transmission nut 8, and the roller is mounted on the mounting column; the transmission assembly comprises a driving plate 23, a driving plate shaft 19 and a gearwheel 17, the driving plate 23 and the gearwheel 17 are mounted on the driving plate shaft 19, a driving groove matched with the roller is formed in the driving plate 23, and the distance between the outer edge of the driving groove and the axis of the driving plate shaft 19 is greater than or equal to the distance between the transmission screw 12 and the axis of the driving plate shaft 19; the output assembly comprises an output gear 27, the output gear 27 being in mesh with the gearwheel 17.
As shown in fig. 2, 5, 6 and 7, the middle of the driving nut 8 has a threaded hole, and the mounting post is located in a direction perpendicular to the threaded hole.
The mounting column comprises a long column and a short column, the rollers comprise a large roller 26 and a small roller 25, the large roller 26 and the small roller 25 are mounted on the long column, and the two small rollers 25 are mounted on the short column and are fixed through elastic check rings for shafts.
Preferably, as shown in fig. 10, the driving plate 23 is a mushroom-shaped structure, the driving groove is located between the pileus structure and the stipe structure, and the edge of the stipe structure contacting the roller forms an included angle of 1-2 ° with the axis of the driving screw 12. The included angle of 1.5 degrees is preferred, no matter in the opening state or in the closing state, the inclined edge of the driving plate 23, the large roller 26 and the small roller 25 in contact with the axis of the transmission screw rod 12 forms the included angle of 1.5 degrees, the disc spring 11 can be prevented from being flattened by the transmission nut 8 due to movement inertia, and the problem that the motor 13 is easily burnt by a traditional three-station electric mechanism is effectively solved.
The driving plates 23 comprise two driving plates, wherein the driving plate 23 close to the large gear 17 is matched with a large roller 26 on the long column, and the driving plate 23 far away from the large gear 17 is matched with a small roller 25 of the short column.
The bearing seat 2 is fixed on the framework 1 through bolts; the motor 13 is bolted to the frame 1 via a mounting plate 15 and a spacer 16, and is coupled to the drive screw 12 via a coupling 14.
Tapered roller bearing 3, baffle 4, dish spring 11 and retaining ring are installed respectively to drive screw 12's both ends, tapered roller bearing 3 is located drive screw 12's tip, baffle 4 is adjacent with tapered roller bearing 3, the retaining ring includes little retaining ring 5 and big retaining ring 10, keeps away from motor 13 one side dish spring 11 be located baffle 4 with between the little retaining ring 5, be close to motor 13 one side dish spring 11 be located baffle 4 with between the big retaining ring 10, drive nut 8 is adjacent with big retaining ring 10.
The power input subassembly is provided with monitoring devices, monitoring devices includes travel switch 6, switch mounting panel 7 and switch action board 9, travel switch 6 passes through the fix with screw switch mounting panel 7 is last, and switch mounting panel 7 passes through the fix with screw on framework 1, switch action board 9 is installed on drive nut 8, travel switch 6 monitors switch action board 9 positions, monitors drive nut 8's position promptly.
The driving plate shaft 19 is sequentially provided with a bearing 20, a small spacer 21, a driving plate 23, a large spacer 24, a driving plate 23, a small spacer 21, a bearing 20, a middle spacer 18 and a large gear 17, the axial displacement of parts on the shaft is limited at two ends by shaft elastic check rings, and the displacement of the bearing 20 at two ends is limited by a pressing plate 22 fixed on the framework 1.
One end of the output gear 27 is mounted on a bearing in the frame 1, and the other end is mounted on a bearing in a gear seat 28, and the gear seat 28 is fixed on the frame 1 by screws.
As shown in fig. 8, the embodiment of the present invention will be specifically described by taking the ground-side closing as an example. After receiving a grounding side switching-on instruction, the grounding side motor 13 rotates forward to drive the side transmission nut 8 to move linearly along a matching groove on the mechanism frame 1 in the switching-on direction, when a switch action plate 9 fixed on the transmission nut 8 touches a travel switch 6 installed on a switch installation plate 7, the grounding side motor 13 is cut off, the transmission nut 8 continues to move in the switching-on direction due to motion inertia until touching a small check ring 5, braking is performed due to buffering of a disc spring 11 inside the transmission nut, at the moment, the drive plate 23 is driven by a small roller 25 and a large roller 26 on the transmission nut 8 to rotate by a fixed angle, and finally the mechanism outputs a fixed angle through meshing of a large gear 17 and an output gear 27 to drive a three-position switch to complete grounding switching-on.
After receiving a grounding side brake-separating instruction, a grounding side motor 13 rotates reversely to drive the side transmission nut 8 to linearly move along a matching groove on the machine frame 1 in the brake-separating direction, when a switch action plate 9 fixed on the transmission nut 8 touches a travel switch 6 installed on a switch installation plate 7, the grounding side motor 13 is cut off, the transmission nut 8 continues to move in the brake-separating direction due to motion inertia until touching a large retainer ring 10, braking is performed due to buffering of an internal disc spring 11, at the moment, a driving plate 23 is driven by a small roller 25 and a large roller 26 on the transmission nut 8 to rotate by a fixed angle, and finally the mechanism outputs a fixed angle through meshing of a large gear 17 and an output gear 27 to drive a three-position switch to complete grounding brake-separating.
As shown in fig. 9, the isolation-side switching-on state is a state in which the principle of motion of the isolation-side switching-on and the principle of motion of the ground-side switching-on and the principle of motion of the isolation-side switching-off are the same.
The utility model provides a pair of three station electric mechanism of big moment of torsion, compact structure, it is concrete, when drive nut 8 was followed transmission screw 12 linear motion, the roller can insert the drive groove of drive plate 23, made the rotatory gear wheel 17 rotation that drives of drive plate 23, rethread bull gear 17 and output gear 27's rotation, carried out the output of moment.
In addition, the distance between the outer edge of the driving groove of the driving plate 23 and the center of the driving plate shaft 19 is greater than or equal to the distance between the transmission screw rod 12 and the center of the driving plate shaft 19, so that the driving plate 23 and the roller on the transmission nut 8 are matched to form a mechanical lock, and the isolation side and the grounding side can not be switched on simultaneously from the mechanical aspect.
The electric mechanism has compact structure, safety and reliability, simple processing technology of the mechanism frame 1 and low production cost; the stroke of the transmission nut 8 is large, the output gear 27 is low in output rotating speed and large in output torque while meeting the switching-on and switching-off time requirement, and the problem of motor burning caused by clamping stagnation of the three-position switch body can be effectively solved.
Although the present invention has been described in detail by referring to the drawings in conjunction with the preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and substance of the present invention, and these modifications or substitutions are intended to be within the scope of the present invention/any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. The utility model provides a three station electric machanisms of big moment of torsion which characterized in that: the power input assembly, the transmission assembly and the output assembly are mounted on the machine frame (1), and the power input assembly is connected with the output assembly through the transmission assembly;
the power input assembly comprises a motor (13), a transmission lead screw (12), a transmission nut (8) and a roller, the output end of the motor (13) is connected with the transmission lead screw (12), the transmission nut (8) is meshed with the transmission lead screw (12), a mounting column is arranged on the transmission nut (8), and the roller is mounted on the mounting column;
the transmission assembly comprises a driving plate (23), a driving plate shaft (19) and a large gear (17), the driving plate (23) and the large gear (17) are installed on the driving plate shaft (19), a driving groove matched with the roller is formed in the driving plate (23), and the distance between the outer edge of the driving groove and the axis of the driving plate shaft (19) is larger than or equal to the distance between the transmission screw rod (12) and the axis of the driving plate shaft (19);
the output assembly comprises an output gear (27), and the output gear (27) is meshed with the large gear (17).
2. The high-torque three-position electric mechanism as claimed in claim 1, wherein: the middle part of the transmission nut (8) is provided with a threaded hole, and the mounting column is positioned in the direction vertical to the threaded hole.
3. The high-torque three-position electric mechanism as claimed in claim 1, wherein: the mounting column comprises a long column and a short column, the rollers comprise a large roller (26) and a small roller (25), one large roller (26) and one small roller (25) are mounted on the long column, and two small rollers (25) are mounted on the short column.
4. The high-torque three-position electric mechanism as claimed in claim 3, wherein: the driving plates (23) comprise two driving plates, the driving plate (23) close to the side of the large gear (17) is matched with the large roller (26) on the long column, and the driving plate (23) far away from the side of the large gear (17) is matched with the small roller (25) of the short column.
5. The high-torque three-position electric mechanism as claimed in any one of claims 1 to 4, wherein: the driving plate (23) is of a mushroom-shaped structure, the driving groove is located between the mushroom cap structure and the mushroom stem structure, and the edge, in contact with the roller, of the mushroom stem structure and the axis of the transmission screw rod (12) form an included angle of 1-2 degrees.
6. The high-torque three-position electric mechanism of claim 5, wherein: tapered roller bearing (3), baffle (4), dish spring (11) and retaining ring are installed respectively to the both ends of drive screw (12), tapered roller bearing (3) are located the tip of drive screw (12), baffle (4) are adjacent with tapered roller bearing (3), the retaining ring includes little retaining ring (5) and big retaining ring (10), little retaining ring (5) are located and keep away from motor one side, big retaining ring (10) are located and are close to motor one side, dish spring (11) are located respectively between baffle (4) and little retaining ring (5) and between baffle (4) and big retaining ring (10), drive nut (8) are adjacent with big retaining ring (10).
7. The high-torque three-position electric mechanism of claim 5, wherein: the power input assembly is provided with monitoring devices, monitoring devices includes travel switch (6), switch mounting panel (7) and switch action board (9), travel switch (6) are fixed through the screw switch mounting panel (7) are last, and switch mounting panel (7) are fixed on framework (1) through the screw, install on drive nut (8) switch action board (9), travel switch (6) monitoring switch action board (9) position.
8. The high-torque three-position electric mechanism of claim 5, wherein: the axial displacement of parts on the shaft is limited by the elastic retainer ring for the shaft at two ends, and the displacement of the bearings (20) at two ends is limited by the pressing plate (22) fixed on the machine frame (1).
9. The high-torque three-position electric mechanism of claim 5, wherein: one end of the output gear (27) is installed on a bearing in the machine frame (1), the other end of the output gear is installed on a bearing in the gear seat (28), and the gear seat (28) is fixed on the machine frame (1) through a screw.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020319639.7U CN211294896U (en) | 2020-03-13 | 2020-03-13 | Large-torque three-station electric mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020319639.7U CN211294896U (en) | 2020-03-13 | 2020-03-13 | Large-torque three-station electric mechanism |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211294896U true CN211294896U (en) | 2020-08-18 |
Family
ID=72012683
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020319639.7U Active CN211294896U (en) | 2020-03-13 | 2020-03-13 | Large-torque three-station electric mechanism |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211294896U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111354579A (en) * | 2020-03-13 | 2020-06-30 | 山东泰开电器机构有限公司 | Motor direct-drive type large-torque three-station electric mechanism for common box |
-
2020
- 2020-03-13 CN CN202020319639.7U patent/CN211294896U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111354579A (en) * | 2020-03-13 | 2020-06-30 | 山东泰开电器机构有限公司 | Motor direct-drive type large-torque three-station electric mechanism for common box |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202736814U (en) | Motor-driven operating mechanism of disconnecting switch | |
| CN211294896U (en) | Large-torque three-station electric mechanism | |
| CN203607267U (en) | A double power supply automatic change-over switch transmission mechanism and a double power supply automatic change-over switch | |
| CN102931002B (en) | Energy storing device of breaker | |
| CN201601040U (en) | Three-position opening and closing electric operating mechanism | |
| CN211828602U (en) | Three-station isolating switch operating mechanism | |
| CN111354579A (en) | Motor direct-drive type large-torque three-station electric mechanism for common box | |
| CN105185618A (en) | GIS switch opening and closing indicating device | |
| CN103646801B (en) | A kind of three station compound isolation earthing switch | |
| CN110010385A (en) | The transmission mechanism of auxiliary switch | |
| CN203690139U (en) | Three-station composite isolation grounding switch | |
| CN102426969B (en) | Three-station isolating switch three-position interlocking device | |
| CN101064220A (en) | Quick electric operation mechanism | |
| CN102110535B (en) | Electric spring operating mechanism | |
| CN209526014U (en) | The transmission mechanism of auxiliary switch | |
| CN201348970Y (en) | Revolving switch device and high voltage switch with revolving switch device | |
| CN110535057B (en) | GIS equipment provided with isolating/grounding switch opening and closing in-place indicating device | |
| CN212735825U (en) | Tool for maintaining network database | |
| CN202349164U (en) | Square shaft output worm and worm gear reducer with stop block | |
| CN203134658U (en) | Three-position switch operating mechanism | |
| CN206468765U (en) | A kind of YE crosses torque protection mechanism | |
| CN210984590U (en) | Large-torque 126KV common-box GIS isolating grounding switch operating mechanism | |
| CN218004758U (en) | Multi-chain wheel driving mechanism | |
| CN202905569U (en) | Linear-motion-type isolation grounding switch | |
| CN210272168U (en) | Three-station mechanism auxiliary switch hysteresis switching device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |