CN105784387A - Device for detecting accident vehicle braking performance - Google Patents
Device for detecting accident vehicle braking performance Download PDFInfo
- Publication number
- CN105784387A CN105784387A CN201610330201.7A CN201610330201A CN105784387A CN 105784387 A CN105784387 A CN 105784387A CN 201610330201 A CN201610330201 A CN 201610330201A CN 105784387 A CN105784387 A CN 105784387A
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- claw
- chuck
- claw chuck
- rolling bearing
- load cells
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/28—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for testing brakes
- G01L5/282—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for testing brakes the vehicle wheels cooperating with rotatable rolls
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- General Physics & Mathematics (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The invention provides a device for detecting accident vehicle braking performance and belongs to the technical field of automobile braking performance detection devices. The device comprises a mechanical part and an electrical control part. The mechanical part comprises a pedestal, a supporting device, an electromotor, a speed reducer, a buffer device, a rigid transmission shaft, claw-type chuck assembly, a lifting device, a disc-type torque sensor and a weighting sensor; the electrical control part comprises a computer, a one-chip microcomputer, a detection indicating device and a printer. The claw-type chuck assembly and a rotating part inside the torque sensor rotate about an axis. The torque sensor converts the force which is conveyed by a claw-type rod piece and is proportional to the braking force in to electric signals and transfers the electric signal to the one-chip microcomputer. The device is convenient for disassembly and assembly, easy to operate, and is portable. By means of the device, braking performance of accident vehicles can be directly detected on-site to avoid a waste of time due to towing the accident vehicles to a check station so that detection efficiency is greatly increased and it is easy to realize.
Description
Technical field
The invention belongs to automobile brake perfrmance detection equipment technical field, especially relate to accident vehicle brake efficiency detecting device.
Background technology
The major way detecting brake efficiency at present both at home and abroad has the experiment of roller brake tester, Flat plate type brake laboratory table, fifth wheel instrument and road examination experiment.
Inspection body many employings roller brake tester of automobile brake perfrmance technology and flat Braking Test System, and indoor detection can only be carried out at measuring station or Automobile Service workshop, equipment price is expensive and has very big limitation.And although fifth wheel instrument experiment and road examination experiment are in outdoor detection, however it is necessary that specific experimental site and equipment, and the abrasion of automobile tire is bigger.Therefore, the accident vehicle that they are not all suitable for travelling carries out Site Detection in outdoor.
Therefore need badly in the middle of prior art and want a kind of novel technical scheme to solve this problem.
Summary of the invention
The technical problem to be solved is: provide a kind of accident vehicle brake efficiency detecting device, and the accident vehicle that the device for solving current detection brake efficiency is not all suitable for travelling carries out the technical problem of Site Detection in outdoor.
Accident vehicle brake efficiency detecting device, including mechanical part and automatically controlled part, it is characterized in that: described mechanical part includes base, a support arrangement, motor, decelerator, buffer unit, rigid shaft, claw chuck assembly, lowering or hoisting gear, disc type torque sensor and LOAD CELLS
Described claw chuck assembly includes rolling bearing I, standing screw, rolling bearing II, tensioning spring, rear claw chuck, claw rod member, front claw chuck and friction facing, one end of described claw rod member is provided with rolling bearing I, the other end of claw rod member is installed with friction facing, the middle part of claw rod member is provided with rolling bearing II, claw rod member is with rolling bearing II for axis rotation, and the quantity of claw rod member is three；Described front claw chuck and rear claw chuck lay respectively at the two ends of rolling bearing II, and the middle part of the middle part of front claw chuck and rear claw chuck is provided with power transmission shaft, front claw chuck is connected by fixing with rear claw chuck after standing screw traverse rolling bearing II；One end of described tensioning spring is fixing with rear claw chuck to be connected, and the other end of tensioning spring is connected to one end of the close friction facing of claw rod member；Being provided with chuck draw-in groove on described rear claw chuck, rear claw chuck is connected with rolling bearing I by chuck draw-in groove；Described front claw chuck is provided with rubber blanket on the one side of claw chuck after deviating from；
Described buffer unit includes shock-absorbing spring, damper disk, spline and clutch plate, the middle part of described damper disk is provided with spline, the quantity of damper disk is two, two damper disks are arranged symmetrically in the both sides of clutch plate, two damper disks are connected with clutch plate each through shock-absorbing spring, connect by bolt and nut is fixing between two damper disks；Described clutch plate is provided with the through hole I installing shock-absorbing spring and the through hole II installing bolt and nut；The quantity of described shock-absorbing spring is four；
Described lowering or hoisting gear is positioned at the side of base and lowering or hoisting gear is adjacent with claw chuck assembly, and lowering or hoisting gear is connected with automobile axle shaft；Tire is between three claw rod members with friction facing, and tire is adjacent with rubber blanket；Being provided with adjusting nut on described base, the top of base is installed with slide rail；The bottom of described support arrangement is connected with base by slide rail, and the top of a support arrangement is installed with motor and disc type torque sensor；Described motor is coaxially connected with decelerator；Described decelerator is coaxially connected with rigid shaft；Described rigid shaft is connected with buffer unit by spline；Described disc type torque sensor includes intermediate rotating member and fixing shell, there is bore screw at the two ends of intermediate rotating member, one end of intermediate rotating member is connected with buffer unit by bolt and nut, the other end of intermediate rotating member is connected with the power transmission shaft of claw chuck assembly by bolt and nut, and fixing shell is fixing with the top of a support arrangement to be connected；Described LOAD CELLS is fixedly mounted on the inside of base and LOAD CELLS is located close to the side of lowering or hoisting gear, LOAD CELLS be provided with electronic display；
Described electric control part is divided and is included computer, single-chip microcomputer, detection instruction device and printer, and described single-chip microcomputer includes transmission conditioning module, amplifies filtration module, A/D modular converter, information acquisition module and actuator control unit；Described computer is connected with single chip communication；Described single-chip microcomputer is connected with motor, disc type torque sensor, detection instruction device and printer respectively by wire, and single-chip microcomputer communicates to connect with LOAD CELLS.
The height of described adjusting nut adjusting base, adjusting nut quantity is four, and is evenly distributed on four angles of base.
Described support arrangement is that altitude mixture control formula props up support arrangement.
Described motor is by the storage battery power supply on automobile.
Described LOAD CELLS is wired LOAD CELLS or bluetooth-type LOAD CELLS.
By above-mentioned design, the present invention can bring following beneficial effect:
The present invention is easy to dismounting, easy to carry, simple to operate, can to accident vehicle Direct Test brake efficiency at the scene, it is easy to accomplish, thus avoiding, because hauling accident vehicle to measuring station, causing the problem lost time, substantially increasing detection efficiency.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is further illustrated:
Fig. 1 is the structural representation of accident vehicle brake efficiency detecting device of the present invention.
Fig. 2 is the structural representation of the claw chuck assembly of accident vehicle brake efficiency detecting device of the present invention.
Fig. 3 is the structural representation of the buffer unit of accident vehicle brake efficiency detecting device of the present invention.
Fig. 4 is the structural representation of the damper disk of accident vehicle brake efficiency detecting device of the present invention.
Fig. 5 is the structural representation of the clutch plate of accident vehicle brake efficiency detecting device of the present invention.
Fig. 6 is the structured flowchart of the automatically controlled part of accident vehicle brake efficiency detecting device of the present invention.
In figure, 1 is base, 2 is adjusting nut, 3 is a support arrangement, 4 is motor, 5 is decelerator, 6 is buffer unit, 7 is rigid shaft, 8 is bolt and nut, 9 is rolling bearing I, 10 is standing screw, 11 is rolling bearing II, 12 is tensioning spring, 13 is rear claw chuck, 14 is claw rod member, 15 is front claw chuck, 16 is friction facing, 17 is tire, 18 is rubber blanket, 19 is automobile axle shaft, 20 is lowering or hoisting gear, 21 is LOAD CELLS, 22 is disc type torque sensor, 23 is chuck draw-in groove, 24 is shock-absorbing spring, 25 is front and back damper disk, 26 is spline, 27 is clutch plate, 28 is slide rail, 2701 is through hole I, 2702 is through hole II.
Detailed description of the invention
Accident vehicle brake efficiency detecting device, including mechanical part and automatically controlled part, it is characterized in that: described mechanical part, as it is shown in figure 1, include base 1, a support arrangement 3, motor 4, decelerator 5, buffer unit 6, rigid shaft 7, claw chuck assembly, lowering or hoisting gear 20, disc type torque sensor 22 and LOAD CELLS 21.
Described claw chuck assembly includes rolling bearing I 9, standing screw 10, rolling bearing II 11, tensioning spring 12, rear claw chuck 13, claw rod member 14, front claw chuck 15 and friction facing 16, one end of described claw rod member 14 is provided with rolling bearing I 9, the other end of claw rod member 14 is installed with friction facing 16, the middle part of claw rod member 14 is provided with rolling bearing II 11, claw rod member 14 is with rolling bearing II 11 for axis rotation, the quantity of claw rod member 14 is three, and three claw rod members 14 are uniformly distributed on rear claw chuck 13；Described front claw chuck 15 and rear claw chuck 13 lay respectively at the two ends of rolling bearing II 11, and the middle part of the middle part of front claw chuck 15 and rear claw chuck 13 is provided with power transmission shaft, front claw chuck 15 is connected by fixing with rear claw chuck 13 after standing screw 10 traverse rolling bearing II 11；One end of described tensioning spring 12 is fixing with rear claw chuck 13 to be connected, and the other end of tensioning spring 12 is connected to one end of the close friction facing 16 of claw rod member 14；Being provided with chuck draw-in groove 23 on described rear claw chuck 13, rear claw chuck 13 is connected with rolling bearing I 9 by chuck draw-in groove 23；Described front claw chuck 15 is provided with rubber blanket 18 after deviating from the one side of claw chuck 13；
Described buffer unit 6 is as shown in Figure 3, including shock-absorbing spring 24, damper disk 25, spline 26 and clutch plate 27, the middle part of described damper disk 25 is provided with spline 26, the quantity of damper disk 25 is two, two damper disks 25 are arranged symmetrically in the both sides of clutch plate 27, two damper disks 25 are connected with clutch plate 27 each through shock-absorbing spring 24, connect by bolt and nut 8 is fixing between two damper disks 25；Described clutch plate 27 is provided with the through hole I 2701 installing shock-absorbing spring 24 and the through hole II 2702 installing bolt and nut 8；The quantity of described shock-absorbing spring 24 is four；
Described lowering or hoisting gear 20 is positioned at the side of base 1 and lowering or hoisting gear 20 is adjacent with claw chuck assembly, and lowering or hoisting gear 20 is connected with automobile axle shaft 19；Tire 17 is between three claw rod members 14 with friction facing 16, and tire 17 is adjacent with rubber blanket 18；Being provided with adjusting nut 2 on described base 1, the top of base 1 is installed with slide rail 28；The bottom of described support arrangement 3 is connected with base 1 by slide rail 28, and the top of a support arrangement 3 is installed with motor 4 and disc type torque sensor 22；Described motor 4 is coaxially connected with decelerator 5；Described decelerator 5 is coaxially connected with rigid shaft 7；Described rigid shaft 7 is connected with buffer unit 6 by spline 26；Described disc type torque sensor 22 includes intermediate rotating member and fixing shell, there is bore screw at the two ends of intermediate rotating member, one end of intermediate rotating member is connected with buffer unit 6 by bolt and nut 8, the other end of intermediate rotating member is connected with the power transmission shaft of claw chuck assembly by bolt and nut 8, and fixing shell is fixing with the top of a support arrangement 3 to be connected；Described LOAD CELLS 21 is fixedly mounted on the inside of base 1 and LOAD CELLS 21 is located close to the side of lowering or hoisting gear 20, LOAD CELLS 21 be provided with electronic display；
As shown in Figure 6, including computer, single-chip microcomputer, detection instruction device and printer, described single-chip microcomputer includes transmission conditioning module, amplifies filtration module, A/D modular converter, information acquisition module and actuator control unit described automatically controlled part；Described computer is connected with single chip communication；Described single-chip microcomputer is connected with motor 4, disc type torque sensor 22, detection instruction device and printer respectively by wire, and single-chip microcomputer and LOAD CELLS 21 communicate to connect.
The height of described adjusting nut 2 adjusting base 1, adjusting nut 2 quantity is four, and is evenly distributed on four angles of base 1.
Described support arrangement 3 props up support arrangement for altitude mixture control formula, and the slide rail 28 that can pass through in lower base 1 moves left and right, fixing after adjusting, very easy to use.
Described motor 4 is by the storage battery power supply on accident automobile or other automobiles.
Described LOAD CELLS 21 is wired LOAD CELLS or bluetooth-type LOAD CELLS.
Described chuck draw-in groove 23 is to narrow gradual change shape draw-in groove by width, and rolling bearing 9 internal ring in groove entangles fixing connection with claw rod member 14 bottom, it is achieved location, optional position in chuck draw-in groove 23.
Described LOAD CELLS 21 is placed in edge, base 1 axis, measures single wheel and places weights above.
Described buffer unit 6 plays cushioning effect, protection torsion torque sensor 22 and claw chuck assembly when power transmits.
Work process: single wheel propped by lowering or hoisting gear 20, step on predetermined brake pedal force, by the height that tire 17 is propped, adjust a support arrangement 3, the front claw chuck 15 having rubber blanket 18 is made to be close to wheel, making tire 17 be placed between three claw rod members 14 with friction facing 16, the active force of tensioning spring 12 makes claw rod member 14 slope inwardly by tire 17 " grabbing " wherein.Claw chuck assembly passes through disc type torque sensor 22, buffer unit 6, rigid shaft 7 and decelerator 5 are connected with motor 4, after actuating motor 4, motor 4 is regulated by based on frequency-converting speed-governing control system, decelerator 5 is driven to operate, the rear claw chuck 13 and the front claw chuck 15 that drive claw chuck assembly rotate, frictional force is produced between friction facing 16 and tire 17, rolling bearing II 11 in the middle part of claw rod member 14 is enclosed within standing screw 10 and rotates around it, claw rod member 14 bottom rolling bearing I 9 moves freely in chuck draw-in groove 23, the lower rolling bearing I 9 of power transmission is moved to narrow slot by sipes, three claw rod members 14 and tire 17 is made to grab tighter and tighter, until vehicle wheel rotation.When tested wheel starts to rotate, claw chuck assembly and disc type torque sensor 22 inner rotatable portion pivoting, the power proportional to brake force that claw rod member 14 is transmitted by disc type torque sensor 22 is transformed into the signal of telecommunication and is transported to single-chip microcomputer.The relation of the size and surface of tyre brake force that stress measured by disc type torque sensor 22 is: the measurement stress of surface of tyre brake force=disc type torque sensor × claw chuck assembly power transmission shaft horizontal length ÷ card disc assembly radius.
As it is shown on figure 3, automatically controlled part is by computer serial communication technical operation actuator control unit, it is achieved the speed regulating control to described motor 4 so that the accident vehicle vehicle wheel rotation that cannot travel.The signal of telecommunication recorded from disc type torque sensor 22 is through transmission conditioning module with after amplifying filtration module, it is sent to A/D modular converter and converts corresponding digital quantity to, after computer collection, storage and process, testing result is shown by detecting instruction device or is printed by printer, generally braking force-time curve and digital parameters can be printed in the lump.After maximum brake force such as 5000N being detected, realizing being automatically stopped the function of motor 4, thus reducing the power consumption of accumulator, being advantageously implemented Aulomatizeted Detect.By the moment parameter in torque sensor 22 each moment that information acquisition module will obtain, automatically generated data is stored in the memorizer in single-chip microcomputer.
After wheel braking force is measured, claw chuck assembly withdrawn from by shifting sledge 28, slowly putting down lowering or hoisting gear 20 makes tire 17 be placed on LOAD CELLS 21 measurement weight, the weight recorded can pass through the electronic display screen displays on LOAD CELLS 21, it is also possible to is transferred to Computer display by single-chip microcomputer.Lowering or hoisting gear 20 is jack-up tire 17 again, withdraws from detecting device, puts down tire 17, takes out lowering or hoisting gear 20, and detection completes.
Claims (5)
1. accident vehicle brake efficiency detecting device, including mechanical part and automatically controlled part, it is characterized in that: described mechanical part includes base (1), a support arrangement (3), motor (4), decelerator (5), buffer unit (6), rigid shaft (7), claw chuck assembly, lowering or hoisting gear (20), disc type torque sensor (22) and LOAD CELLS (21)
Described claw chuck assembly includes rolling bearing I (9), standing screw (10), rolling bearing II (11), tensioning spring (12), rear claw chuck (13), claw rod member (14), front claw chuck (15) and friction facing (16), one end of described claw rod member (14) is provided with rolling bearing I (9), the other end of claw rod member (14) is installed with friction facing (16), the middle part of claw rod member (14) is provided with rolling bearing II (11), claw rod member (14) is with rolling bearing II (11) for axis rotation, the quantity of claw rod member (14) is three；Described front claw chuck (15) and rear claw chuck (13) lay respectively at the two ends of rolling bearing II (11), and the middle part of the middle part of front claw chuck (15) and rear claw chuck (13) is provided with power transmission shaft, front claw chuck (15) is connected through rolling bearing II (11) is fixing with rear claw chuck (13) afterwards by standing screw (10)；One end of described tensioning spring (12) is fixing with rear claw chuck (13) to be connected, and the other end of tensioning spring (12) is connected to one end of the close friction facing (16) of claw rod member (14)；Being provided with chuck draw-in groove (23) on described rear claw chuck (13), rear claw chuck (13) is connected with rolling bearing I (9) by chuck draw-in groove (23)；Described front claw chuck (15) is provided with rubber blanket (18) after deviating from the one side of claw chuck (13)；
Described buffer unit (6) includes shock-absorbing spring (24), damper disk (25), spline (26) and clutch plate (27), the middle part of described damper disk (25) is provided with spline (26), the quantity of damper disk (25) is two, two damper disks (25) are arranged symmetrically in the both sides of clutch plate (27), two damper disks (25) are connected with clutch plate (27) each through shock-absorbing spring (24), connect by bolt and nut (8) is fixing between two damper disks (25)；Described clutch plate (27) is provided with the through hole I (2701) installing shock-absorbing spring (24) and the through hole II (2702) of bolt and nut (8) is installed；The quantity of described shock-absorbing spring (24) is four；
Described lowering or hoisting gear (20) is positioned at the side of base (1) and lowering or hoisting gear (20) is adjacent with claw chuck assembly, and lowering or hoisting gear (20) is connected with automobile axle shaft (19)；Tire (17) is positioned between three claw rod members (14) with friction facing (16), and tire (17) is adjacent with rubber blanket (18)；Being provided with adjusting nut (2) on described base (1), the top of base (1) is installed with slide rail (28)；The bottom of described support arrangement (3) is connected with base (1) by slide rail (28), and the top of a support arrangement (3) is installed with motor (4) and disc type torque sensor (22)；Described motor (4) is coaxially connected with decelerator (5)；Described decelerator (5) is coaxially connected with rigid shaft (7)；Described rigid shaft (7) is connected with buffer unit (6) by spline (26)；Described disc type torque sensor (22) includes intermediate rotating member and fixing shell, there is bore screw at the two ends of intermediate rotating member, one end of intermediate rotating member is connected with buffer unit (6) by bolt and nut (8), the other end of intermediate rotating member is connected with the power transmission shaft of claw chuck assembly by bolt and nut (8), and fixing shell is fixing with the top of a support arrangement (3) to be connected；Described LOAD CELLS (21) is fixedly mounted on the inside of base (1) and LOAD CELLS (21) is located close to the side of lowering or hoisting gear (20), and LOAD CELLS is provided with electronic display on (21)；
Described electric control part is divided and is included computer, single-chip microcomputer, detection instruction device and printer, and described single-chip microcomputer includes transmission conditioning module, amplifies filtration module, A/D modular converter, information acquisition module and actuator control unit；Described computer is connected with single chip communication；Described single-chip microcomputer is connected with motor (4), disc type torque sensor (22), detection instruction device and printer respectively by wire, and single-chip microcomputer communicates to connect with LOAD CELLS (21).
2. accident vehicle brake efficiency detecting device according to claim 1, it is characterized in that: the height of described adjusting nut (2) adjusting base (1), adjusting nut (2) quantity is four, and is evenly distributed on four angles of base (1).
3. accident vehicle brake efficiency detecting device according to claim 1, is characterized in that: described support arrangement (3) props up support arrangement for altitude mixture control formula.
4. accident vehicle brake efficiency detecting device according to claim 1, is characterized in that: described motor (4) is by the storage battery power supply on automobile.
5. accident vehicle brake efficiency detecting device according to claim 1, is characterized in that: described LOAD CELLS (21) is wired LOAD CELLS or bluetooth-type LOAD CELLS.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610330201.7A CN105784387B (en) | 2016-05-18 | 2016-05-18 | Accident vehicle brake efficiency detection means |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610330201.7A CN105784387B (en) | 2016-05-18 | 2016-05-18 | Accident vehicle brake efficiency detection means |
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| Publication Number | Publication Date |
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| CN105784387A true CN105784387A (en) | 2016-07-20 |
| CN105784387B CN105784387B (en) | 2018-01-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610330201.7A Expired - Fee Related CN105784387B (en) | 2016-05-18 | 2016-05-18 | Accident vehicle brake efficiency detection means |
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Cited By (6)
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| CN108180932A (en) * | 2018-02-09 | 2018-06-19 | 杜勉 | A kind of contamination accident emergency monitoring device |
| CN108344435A (en) * | 2018-02-09 | 2018-07-31 | 杜勉 | A kind of novel contamination accident emergency monitoring device |
| CN109605948A (en) * | 2019-01-29 | 2019-04-12 | 谢东 | A kind of portable printer and print system |
| CN110031144A (en) * | 2019-05-20 | 2019-07-19 | 江苏省特种设备安全监督检验研究院 | Multifunctional static braking moment test device and test method |
| CN110243612A (en) * | 2019-06-21 | 2019-09-17 | 武汉轻工大学 | Vehicle braking drags detection device |
| CN115901204A (en) * | 2022-11-01 | 2023-04-04 | 齐齐哈尔大学 | Elevator stopper body detection tool |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108180932A (en) * | 2018-02-09 | 2018-06-19 | 杜勉 | A kind of contamination accident emergency monitoring device |
| CN108344435A (en) * | 2018-02-09 | 2018-07-31 | 杜勉 | A kind of novel contamination accident emergency monitoring device |
| CN108180932B (en) * | 2018-02-09 | 2018-12-18 | 浙江华港染织集团有限公司 | A kind of contamination accident emergency monitoring device |
| CN109605948A (en) * | 2019-01-29 | 2019-04-12 | 谢东 | A kind of portable printer and print system |
| CN109605948B (en) * | 2019-01-29 | 2024-04-12 | 谢东 | Portable printer and printing system |
| CN110031144A (en) * | 2019-05-20 | 2019-07-19 | 江苏省特种设备安全监督检验研究院 | Multifunctional static braking moment test device and test method |
| CN110243612A (en) * | 2019-06-21 | 2019-09-17 | 武汉轻工大学 | Vehicle braking drags detection device |
| CN115901204A (en) * | 2022-11-01 | 2023-04-04 | 齐齐哈尔大学 | Elevator stopper body detection tool |
| CN115901204B (en) * | 2022-11-01 | 2023-08-18 | 齐齐哈尔大学 | Elevator brake body detects tool |
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| Publication number | Publication date |
|---|---|
| CN105784387B (en) | 2018-01-26 |
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