CN112249086B - Mining hydraulic reinforcement integrated direct-drive switch machine - Google Patents
Mining hydraulic reinforcement integrated direct-drive switch machine Download PDFInfo
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- CN112249086B CN112249086B CN202011113688.6A CN202011113688A CN112249086B CN 112249086 B CN112249086 B CN 112249086B CN 202011113688 A CN202011113688 A CN 202011113688A CN 112249086 B CN112249086 B CN 112249086B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L5/00—Local operating mechanisms for points or track-mounted scotch-blocks; Visible or audible signals; Local operating mechanisms for visible or audible signals
- B61L5/04—Fluid-pressure devices for operating points or scotch-blocks
- B61L5/045—Fluid-pressure devices for operating points or scotch-blocks using electrically controlled fluid-pressure operated driving means
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Abstract
A mining hydraulic reinforcement integrated direct-drive switch machine comprises a power device and a measurement feedback device, wherein the power device and the measurement feedback device are installed in an explosion-proof device; the explosion-proof device comprises a switch machine shell; the power device is a hydraulic force-increasing integrated electric cylinder and is divided into a driving part and a force-increasing part; the boosting part is a two-stage or three-stage boosting part, the outer wall of the cylinder barrel is provided with a through hole, and a high-pressure sealing oil plug is adopted for plugging during working; the measurement feedback device comprises a grating displacement sensor, an induction device of the grating displacement sensor is fixed with a working piston rod of a hydraulic reinforcement integrated electric cylinder, the hydraulic reinforcement integrated electric cylinder is fixed in the inner part of a switch machine shell through a V-shaped block, and the hydraulic reinforcement integrated electric cylinder drives the induction device of the grating displacement sensor and a rail action rod to do linear motion; the grating displacement sensor is connected with the wireless signal generator, and an antenna of the wireless signal generator extends to the outside of the point switch; the invention simplifies the structure of the switch machine, reduces the whole size and working voltage of the switch machine and has higher safety.
Description
Technical Field
The invention belongs to the technical field of rail transit switch machines, and particularly relates to a mining hydraulic reinforcement integrated direct-drive switch machine.
Background
The switch machine is the core and the main body of a railway turnout conversion system, but the size of a motor and a reducer inside the existing mining electric switch machine is large, and the switch machine is complicated in internal structure and large in overall size due to the fact that devices such as an automatic switch and a friction connector are added. In addition, most of the existing mining electric switch machines adopt gear meshing transmission, the rotary motion is converted into linear motion through gear and rack transmission, devices such as a friction coupler and a starting block are additionally arranged in the middle, and the transmission chain is long, so that the working efficiency of the switch machine is low.
One of the outstanding problems of the mining electric switch machine is the safety problem, and the larger the power of the mining electric switch machine is, the more easily the mining electric switch machine is subjected to explosion accidents, and serious loss is caused. The existing mining switch machine is generally high in voltage and power, and needs a special power supply line for power supply, for example, the rated voltage of a certain common mining switch machine is 160V, and the power of a motor reaches 250W. High cost, easy accident and low safety.
Because the mining switch machine generally needs the flame proof device, the external flame proof device of the too big switch machine not only influences the installation safety, still can cause the material waste, increases production manufacturing cost, and the structure of present mining switch machine is complicated, and transmission system is loaded down with trivial details, and the volume is generally great, and required external flame proof device is also great.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide the mining hydraulic boosting integrated direct-drive switch machine, which has the advantages that the structure of the switch machine is simplified, the overall size and the working voltage of the switch machine are reduced, a lighting power supply can be used for supplying power, and the safety is higher.
In order to achieve the purpose, the invention adopts the following technical scheme:
a mining hydraulic reinforcement integrated direct-drive switch machine comprises a power device and a measurement feedback device, wherein the power device and the measurement feedback device are installed in an explosion-proof device;
the explosion-proof device comprises a switch machine shell 28;
the power device is a hydraulic force-increasing integrated electric cylinder and is divided into a driving part and a force-increasing part; the driving part comprises a cylinder bottom 1, a cylinder barrel 4 is mounted on the cylinder bottom 1 through screws, a motor shell 5 arranged in the cylinder barrel 4 is mounted on the cylinder bottom 1, a motor stator 6 and the motor shell 5 arranged in the motor shell 5 are fixed through interference fit, a motor rotor 7 in the motor stator 6 is connected with the left end of a lead screw 10, the lead screw 10 is supported on a front bearing 2 and a rear bearing 8, the front bearing 2 and the rear bearing 8 are respectively mounted in bearing holes of the cylinder bottom 1 and a motor rear end cover 9, and the motor rear end cover 9 is mounted at the upper end of the motor shell 5; the motor rotor 7 is axially positioned on the screw rod 10 through a first shaft sleeve 23 and a first shaft sleeve 24; the left end of the screw rod 10 is connected with the inner ring of the rotating speed sensor 20 and is fixed by a snap ring 21, and the outer ring of the rotating speed sensor 20 is arranged in the inner hole of the cylinder bottom 1; the force increasing part is two-stage force increasing or three-stage force increasing.
The two-stage boosting comprises a trapezoidal nut 11, the trapezoidal nut 11 is matched with a lead screw 10 to form a lead screw nut pair, the trapezoidal nut 11 is connected with a boosting piston 12, a boosting piston rod 13 of the boosting piston 12 is connected with the trapezoidal nut 11 and locked through a first locking nut 14, the boosting piston rod 13 penetrates through a first piston cover plate 16 and extends into a first working piston rod 18, the first piston cover plate 16 and the boosting piston rod 13 are in clearance fit, the first piston cover plate 16 is installed on a first working piston 17, the first working piston 17 is connected onto a cylinder barrel 4, and the first working piston rod 18 of the first working piston 17 is locked through a second locking nut 19.
The three-stage reinforcement comprises a trapezoidal nut 11, the trapezoidal nut 11 is matched with a lead screw 10 to form a lead screw nut pair, the trapezoidal nut 11 is connected with a reinforcement piston 12, a reinforcement piston rod 13 of the reinforcement piston 12 is connected with the trapezoidal nut 11 and is locked through a first locking nut 14, the reinforcement piston rod 13 penetrates through a first piston cover plate 16 and extends into a first working piston rod 18, the first piston cover plate 16 and the reinforcement piston rod 13 are in clearance fit, the first piston cover plate 16 is installed on a first working piston 17, the first working piston 17 is connected onto a cylinder barrel 4, and the first working piston rod 18 of the first working piston 17 is locked through a second locking nut 19; the first working piston rod 18 passes through the second piston cover plate 31 and extends into the second working piston rod 33, the second piston cover plate 31 and the first working piston rod 18 are in clearance fit, the second piston cover plate 31 is installed on the second working piston 32, the second working piston 32 is connected to the cylinder barrel 4, and the second working piston rod 33 of the second working piston 32 is locked through the third locking nut 34.
The outer wall of the cylinder barrel 4 is provided with a through hole for injecting oil and discharging oil, an oil scale is matched to check whether the oil is sufficient, and a high-pressure sealing oil plug is adopted for plugging during working.
The leftmost end of the screw rod 10 is a section of spline shaft, and is in spline connection with a manual rocker 22.
The force-increasing piston 12 and the first working piston 17, and the first working piston 17 and the second working piston 32 are filled with hydraulic oil, and the difference between the hydraulic oil action areas of the force-increasing piston 12, the first working piston 17 and the second working piston 32 is large.
The measurement feedback device comprises a grating displacement sensor 25, an induction device of the grating displacement sensor 25 is fixed with a working piston rod of a hydraulic force-increasing integrated electric cylinder, the hydraulic force-increasing integrated electric cylinder is fixed in a switch machine shell 28 through a V-shaped block 27, and the hydraulic force-increasing integrated electric cylinder drives the induction device of the grating displacement sensor 25 and a rail action rod 26 to do linear motion; the signal line of the grating displacement sensor 25 is connected to the terminal of a wireless signal generator 29, and the antenna of the wireless signal generator 29 is extended to the outside of the switch machine through a small hole on the switch machine casing 28.
The invention has the following advantages:
the hydraulic force-boosting integrated electric cylinder with smaller volume is adopted as a power device to replace a motor, a reducer and the like in the existing mining switch machine, so that the size of the switch machine is reduced, the installation is simple, and the safety is high.
The trapezoidal nut pair adopted by the invention has a self-locking function, can replace a locking device in the existing mining point switch, prevents external force from converting a turnout, and reduces the volume of the point switch.
Thirdly, the power device of the invention adopts a pressurization structure with a screw rod and a piston connected in series in the front and back, and can reduce the torque output of the motor under the condition of meeting the load requirement, so that the voltage and the power of the direct current torque motor used by the invention are smaller, for example, in the embodiment 1, the voltage only needs 12V, the power only needs 42W, in the embodiment 2, the voltage only needs 12V, the power only needs 18W, and the voltage and the power are far smaller than the voltage and the power of the motor used by the existing mining switch machine, and the lighting power supply can be used for directly supplying power.
And oil is adopted between the hydraulic force-increasing integrated electric cylinder force-increasing piston and the working piston for force transmission, so that compared with the traditional electric cylinder, the impact vibration when the piston moves to the extreme position is greatly reduced, and the impact of the tramcar on the electric cylinder of the rutting machine can be reduced.
Drawings
Fig. 1 is a top view of the present invention.
FIG. 2 is a schematic structural view of two-stage force amplification in embodiment 1 of the present invention.
FIG. 3 is a schematic structural diagram of the two-stage power-increasing hand-operated rocker according to embodiment 1 of the present invention.
Fig. 4 is a partial sectional view of a rotor portion of a motor according to embodiment 1 of the present invention.
FIG. 5 is a schematic view showing the structure of the two-stage booster of embodiment 1 of the present invention when fully deployed.
FIG. 6 is a schematic structural view of three-stage force amplification in embodiment 2 of the present invention.
FIG. 7 is a schematic structural diagram of embodiment 2 of the present invention after a manual rocker is installed in a three-stage force-increasing manner.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
referring to fig. 1, the explosion suppression device includes a switch machine housing 28, and the switch machine housing 28 has high strength and can bear the explosion pressure of the explosive substances inside and prevent the explosive mixture inside from spreading to the surrounding of the housing;
referring to fig. 2, 3, 4 and 5, the power device is a hydraulic force-increasing integrated electric cylinder which is divided into a driving part and a force-increasing part; the driving part comprises a cylinder bottom 1, a cylinder barrel 4 is installed on the cylinder bottom 1 through screws, a through hole is processed on the cylinder bottom 1 to facilitate the passing of a motor circuit, a motor shell 5 arranged inside the cylinder barrel 4 is installed on the cylinder bottom 1 through screws, a motor stator 6 arranged inside the motor shell 5 and the motor shell 5 are fixed through interference fit, a motor rotor 7 inside the motor stator 6 is connected with the left end of a lead screw 10 through a flat key 3, threads are not processed on the connection part of the lead screw 10 and the motor rotor 7, the lead screw 10 is supported on a front bearing 2 and a rear bearing 8, the front bearing 2 and the rear bearing 8 are respectively installed in bearing holes of the cylinder bottom 1 and a motor rear end cover 9, and the motor rear end cover 9 is installed at the upper end of the motor shell 5 through screws; the motor rotor 7 is axially positioned on the screw rod 10 through a first shaft sleeve 23 and a first shaft sleeve 24; the left end of the screw rod 10 is connected with the inner ring of the rotating speed sensor 20 and is fixed by a snap ring 21, and the outer ring of the rotating speed sensor 20 is arranged in the inner hole of the cylinder bottom 1.
The boosting part adopts two-stage boosting and comprises a trapezoidal nut 11, the trapezoidal nut 11 is matched with a lead screw 10 to form a lead screw nut pair, the trapezoidal nut 11 is connected with a boosting piston 12 through a screw, a boosting piston rod 13 of the boosting piston 12 is connected with the trapezoidal nut 11 and locked through a first locking nut 14, the boosting piston rod 13 penetrates through a first piston cover plate 16 to extend into a first working piston rod 18, the first piston cover plate 16 is in clearance fit with the boosting piston rod 13, the first piston cover plate 16 is installed on a first working piston 17 through a screw, the first working piston 17 is connected onto a cylinder barrel 4, and the first working piston rod 18 of the first working piston 17 is locked through a second locking nut 19.
The outer wall of the cylinder barrel 4 is provided with a through hole for injecting oil and discharging oil, an oil scale is matched to check whether the oil is sufficient, and a first high-pressure sealing oil plug 15 is adopted for plugging during work.
The left end of the screw rod 10 is a section of spline shaft, and is in spline connection with the manual rocker 22.
The space between the force-increasing piston 12 and the first working piston 17 is filled with hydraulic oil, and the difference between the acting areas of the hydraulic oil of the force-increasing piston 12 and the first working piston 17 is large.
Referring to fig. 1, the measurement feedback device includes a grating displacement sensor 25, a sensing device of the grating displacement sensor 25 and a working piston rod 18 of a hydraulic force-increasing integrated electric cylinder are fixed together by bolts, the hydraulic force-increasing integrated electric cylinder is fixed inside a switch machine shell 28 by a screw and a V-shaped block 27, and the hydraulic force-increasing integrated electric cylinder drives the sensing device of the grating displacement sensor 25 and a rail action rod 26 to make linear motion; the signal line of the grating displacement sensor 25 is connected to the terminal of a wireless signal generator 29, and the antenna of the wireless signal generator 29 is extended to the outside of the switch machine through a small hole on the switch machine casing 28.
The working principle of the embodiment is as follows:
when the power device works, a motor power supply is switched on, the motor rotor 7 rotates, torque is transmitted to the screw rod 10 through the flat key 3, the screw rod 10 is driven to rotate, the screw rod 10 cannot move axially, the trapezoidal nut 11 rotates and advances through thread matching, the boosting piston 12 is driven to advance, the boosting piston rod 13 is pushed out, the boosting piston rod 13 moves forwards and is inserted into an inner cavity of the first working piston rod 18, the boosting piston 12 and the first working piston 17 have different hydraulic oil action areas, at the moment, a boosting stage is carried out, the first working piston 17 and the first working piston rod 18 are pushed to advance through the action of oil, the rotating motion of the first working piston rod 18 is eliminated, the output force which is multiple times of the original output force is obtained, and the rotating speed of the motor is monitored by the rotating speed sensor 20 in real time. During the return motion, the motor rotor 7 rotates reversely to drive the screw rod 10 to rotate reversely, the trapezoidal nut 11 also moves backwards in the opposite direction, and drives the boosting piston 12 and the boosting piston rod 13 to move backwards, so that the first working piston 17 and the first working piston rod 18 move backwards under the action of the oil, and the retraction force is the same as the output force during the forward motion. When no power supply is input, the manual rocker 22 is shaken to drive the screw rod 10 to rotate, so that the boosting output of the hydraulic boosting integrated electric cylinder is realized.
When the mining hydraulic boosting integrated direct-drive switch machine works, the first working piston rod 18 drives the sensing device of the grating displacement sensor 25 and the rail action rod 26 to do linear motion, the switch position conversion is completed, the grating displacement sensor 25 monitors the displacement of the first working piston rod 18 in real time, the switch position is reflected, and the displacement is directly sent to a central control room signal receiver through the wireless signal generator 29, so that the switch machine is controlled.
In example 1, the voltage is only 12V, and the power is only 42W.
The outer wall of the cylinder barrel 4 is provided with two through holes for injecting oil and discharging oil, an oil scale is matched to check whether the oil is sufficient, and the first high-pressure sealing oil plug 15 and the second high-pressure sealing oil plug 30 are used for plugging during working.
The force-increasing piston 12 and the first working piston 17, and the first working piston 17 and the second working piston 32 are filled with hydraulic oil, and the difference between the hydraulic oil action areas of the force-increasing piston 12, the first working piston 17 and the second working piston 32 is large.
In the embodiment 2, the voltage is only 12V, and the power is only 18W.
The working principle of the embodiment is as follows:
when the power device works, a motor power supply is switched on, the motor rotor 7 rotates, torque is transmitted to the screw rod 10 through the flat key 3 to drive the screw rod 10 to rotate, the screw rod 10 cannot move axially, so the trapezoidal nut 11 rotates and advances through thread matching to drive the boosting piston 12 to advance, the boosting piston rod 13 is pushed out, the boosting piston rod 13 moves forwards and is inserted into the inner cavity of the first working piston rod 18, the boosting piston 12 and the working piston 17 have different hydraulic oil action areas, a two-stage boosting stage is started at the moment, the first working piston 17 and the first working piston rod 18 are pushed to advance through the action of oil, the rotary motion of the working piston rod is eliminated, the first working piston rod 18 moves forwards and is inserted into the inner cavity of the second working piston rod 33, and the first working piston 17 and the second working piston 32 have different hydraulic oil action areas, and then a three-stage boosting stage is started, the second working piston 32 and the second working piston rod 33 are pushed to advance under the action of oil, so that the output force which is multiplied by the original output force or even multiplied by ten is obtained, and the rotating speed of the motor is monitored by the rotating speed sensor 20 in real time. During the return movement, the motor rotor 7 rotates reversely to drive the screw rod 10 to rotate reversely, the trapezoidal nut 11 also moves backwards in the opposite direction, and drives the boosting piston 12 and the boosting piston rod 13 to move backwards, under the action of the oil, the first working piston 17 and the first working piston rod 18 move backwards, so as to drive the second working piston 32 and the second working piston rod 33 to move backwards, and the retraction force is the same as the output force during the forward movement. When no power supply is input, the manual rocker 22 is shaken to drive the screw rod 10 to rotate, so that the boosting output of the electric cylinder is realized.
Claims (4)
1. The utility model provides a mining hydraulic pressure reinforcement integration directly drives goat which characterized in that: the device comprises a power device and a measurement feedback device which are arranged in an explosion-proof device;
the explosion-proof device comprises a switch machine shell (28);
the power device is a hydraulic force-increasing integrated electric cylinder and is divided into a driving part and a force-increasing part; the driving part comprises a cylinder bottom (1), a cylinder barrel (4) is installed on the cylinder bottom (1), a motor shell (5) arranged inside the cylinder barrel (4) is installed on the cylinder bottom (1), a motor stator (6) and the motor shell (5) arranged inside the motor shell (5) are fixed through interference fit, a motor rotor (7) inside the motor stator (6) is connected with the left end of a lead screw (10), the lead screw (10) is supported on a front bearing (2) and a rear bearing (8), the front bearing (2) and the rear bearing (8) are installed in bearing holes of the cylinder bottom (1) and a motor rear end cover (9) respectively, and the motor rear end cover (9) is installed at the upper end of the motor shell (5); the motor rotor (7) is axially positioned on the screw rod (10) through a first shaft sleeve (23) and a second shaft sleeve (24); the left end of the screw rod (10) is connected with the inner ring of the rotating speed sensor (20) and is fixed by a snap ring (21), and the outer ring of the rotating speed sensor (20) is arranged in the inner hole of the cylinder bottom (1); the force increasing part is two-stage force increasing or three-stage force increasing;
the two-stage reinforcement comprises a trapezoidal nut (11), the trapezoidal nut (11) is matched with a lead screw (10) to form a lead screw nut pair, the trapezoidal nut (11) is connected with a reinforcement piston (12), a reinforcement piston rod (13) of the reinforcement piston (12) is connected with the trapezoidal nut (11) and locked through a first locking nut (14), the reinforcement piston rod (13) penetrates through a first piston cover plate (16) to extend into a first working piston rod (18), the first piston cover plate (16) is in clearance fit with the reinforcement piston rod (13), the first piston cover plate (16) is installed on the first working piston (17), the first working piston (17) is connected onto a cylinder barrel (4), and the first working piston rod (18) of the first working piston (17) is locked through a second locking nut (19);
the three-stage reinforcement comprises a trapezoidal nut (11), the trapezoidal nut (11) is matched with a lead screw (10) to form a lead screw nut pair, the trapezoidal nut (11) is connected with a reinforcement piston (12), a reinforcement piston rod (13) of the reinforcement piston (12) is connected with the trapezoidal nut (11) and locked through a first locking nut (14), the reinforcement piston rod (13) penetrates through a first piston cover plate (16) to extend into a first working piston rod (18), the first piston cover plate (16) is in clearance fit with the reinforcement piston rod (13), the first piston cover plate (16) is installed on the first working piston (17), the first working piston (17) is connected onto a cylinder barrel (4), and the first working piston rod (18) of the first working piston (17) is locked through a second locking nut (19); the first working piston rod (18) penetrates through the second piston cover plate (31) and extends into the second working piston rod (33), the second piston cover plate (31) is in clearance fit with the first working piston rod (18), the second piston cover plate (31) is installed on the second working piston (32), the second working piston (32) is connected to the cylinder barrel (4), and the second working piston rod (33) of the second working piston (32) is locked through the third locking nut (34);
the measurement feedback device comprises a grating displacement sensor (25), an induction device of the grating displacement sensor (25) is fixed with a working piston rod of a hydraulic force-increasing integrated electric cylinder, the hydraulic force-increasing integrated electric cylinder is fixed in a switch machine shell (28) through a V-shaped block (27), and the hydraulic force-increasing integrated electric cylinder drives the induction device of the grating displacement sensor (25) and a rail action rod (26) to do linear motion; the signal wire of the grating displacement sensor (25) is connected with the terminal of a wireless signal generator (29), and the antenna of the wireless signal generator (29) extends to the outside of the switch machine through a small hole on the switch machine shell (28).
2. The mining hydraulic boosting integrated direct-drive switch machine according to claim 1, characterized in that: the outer wall of the cylinder barrel (4) is provided with a through hole for injecting oil and discharging oil, an oil scale is matched to check whether the oil is sufficient, and a high-pressure sealing oil plug is adopted for plugging during work.
3. The mining hydraulic boosting integrated direct-drive switch machine according to claim 1, characterized in that: the leftmost end of the screw rod (10) is provided with a section of spline shaft which is in spline connection with the manual rocker.
4. The mining hydraulic boosting integrated direct-drive switch machine according to claim 1, characterized in that: hydraulic oil is filled between the boosting piston (12) and the first working piston (17) and between the first working piston (17) and the second working piston (32), and the difference between the action areas of the hydraulic oil of the boosting piston (12), the first working piston (17) and the second working piston (32) is large.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011113688.6A CN112249086B (en) | 2020-10-17 | 2020-10-17 | Mining hydraulic reinforcement integrated direct-drive switch machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011113688.6A CN112249086B (en) | 2020-10-17 | 2020-10-17 | Mining hydraulic reinforcement integrated direct-drive switch machine |
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| Publication Number | Publication Date |
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| CN112249086A CN112249086A (en) | 2021-01-22 |
| CN112249086B true CN112249086B (en) | 2021-09-03 |
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| CN202011113688.6A Active CN112249086B (en) | 2020-10-17 | 2020-10-17 | Mining hydraulic reinforcement integrated direct-drive switch machine |
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Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT403462B (en) * | 1995-05-03 | 1998-02-25 | Vae Ag | DEVICE FOR MOVING SWITCHES |
| CN2525114Y (en) * | 2002-04-28 | 2002-12-11 | 王进武 | Multiple step booster full distance automatic stepless speed changing hydraulic rail jack device |
| CN1225603C (en) * | 2003-08-19 | 2005-11-02 | 焦让 | Hydraulic reinforcement electric cylinder |
| USRE48026E1 (en) * | 2004-01-02 | 2020-06-02 | Vossloh Signaling Usa, Inc. | Hydraulic switch machine for railroads |
| CN201276131Y (en) * | 2008-10-16 | 2009-07-22 | 王俊哲 | Electrohydraulic master control railroad switch executor |
| CN202641739U (en) * | 2012-04-11 | 2013-01-02 | 北京中铁通电务技术开发有限公司 | Multi-grade oil cylinder applied to point switch |
| CN204020915U (en) * | 2014-08-06 | 2014-12-17 | 刘明霞 | Electrohydraulic switch machine |
| CN204020913U (en) * | 2014-08-09 | 2014-12-17 | 济宁东达机电有限责任公司 | A kind of mining explosion-proof type electric switch machine |
| CN106274984B (en) * | 2016-08-28 | 2018-10-30 | 西安煤矿机械有限公司 | Electric cabinet is controlled in a kind of mining switch rotation department |
| CN109677457A (en) * | 2019-01-09 | 2019-04-26 | 北京全路通信信号研究设计院集团有限公司 | A kind of Fibre Optical Sensor point machine state monitoring apparatus and method |
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2020
- 2020-10-17 CN CN202011113688.6A patent/CN112249086B/en active Active
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