CN108412921B - A kind of liquid braking device of perseverance braking moment - Google Patents
A kind of liquid braking device of perseverance braking moment Download PDFInfo
- Publication number
- CN108412921B CN108412921B CN201810083977.2A CN201810083977A CN108412921B CN 108412921 B CN108412921 B CN 108412921B CN 201810083977 A CN201810083977 A CN 201810083977A CN 108412921 B CN108412921 B CN 108412921B
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- China
- Prior art keywords
- abrasion loss
- unloads
- braking
- control valve
- bullet
- 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.)
- Expired - Fee Related
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D66/00—Arrangements for monitoring working conditions, e.g. wear, temperature
- F16D66/02—Apparatus for indicating wear
- F16D66/021—Apparatus for indicating wear using electrical detection or indication means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/14—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D66/00—Arrangements for monitoring working conditions, e.g. wear, temperature
- F16D2066/003—Position, angle or speed
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2121/00—Type of actuator operation force
- F16D2121/02—Fluid pressure
- F16D2121/04—Fluid pressure acting on a piston-type actuator, e.g. for liquid pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2125/00—Components of actuators
- F16D2125/02—Fluid-pressure mechanisms
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Braking Arrangements (AREA)
- Regulating Braking Force (AREA)
Abstract
The invention discloses a kind of liquid braking devices of permanent braking moment, mainly include equipment, power device, control device.Laser range sensor there are two being filled after the piston wall of rear cover one end, after single-chip microcontroller reads sensor institute measured data, it controls digital regulation resistance and exports corresponding voltage, this voltage is amplified and the error according to caused by each transmission stage compensates, then this voltage is accessed to the control terminal of proportional pressure control valve, hydraulic fluid pressure P in control piperIt unloads(oil pressure when brake is also off-load oil pressure), this pressure act on the upper (contrary with the spring force acted on piston) of piston, and the elastic force P with tripping springBulletDifference be a constant force N, i.e. N=PBullet‑PIt unloads.Type of the present invention can adjust P by proportional pressure control valve according to different abrasion lossesIt unloadsSize, work as PBulletWhen becoming smaller with abrasion loss, PIt unloadsAlso become smaller therewith, so that PBullet‑PIt unloadsEqual to steady state value N.
Description
Technical field
The invention belongs to power-equipment brake apparatus technical fields, are related to a kind of liquid of permanent braking moment for coalcutter
Press brake.
Background technique
The features such as liquid braking device has structure simple, small in size, and braking moment is big, is commonly pacified on coal mining machine equipment
The degree of reliability of full anti-skid device, performance is safely operated coalcutter and the personal safety of operator is most important." coal
Mine safety code " regulation, when coal work inclination angle is at 15 ° or more, coalcutter must have reliable anti-skid device.It adopts at present
Coal machine liquid braking device is to carry out braking operation by piston pressing friction pair by spring force, pushes and lives by the hydraulic coupling of hydraulic oil
Plug overcomes spring force to carry out braking release.When liquid braking device braking, hydraulic oil oil return box off-load in brake, off-load at this time
Pressure is zero, and brake pressing force is spring force.The braking moment of liquid braking device depends primarily on the friction of friction plate
Performance, and braking pressing force, when coalcutter works, the friction disc wear of brake is extremely serious, the spring pressure of liquid braking device
Clamp force with friction plate abrasion loss increase and reduce, in the case where other conditions are constant, the braking moment of brake also with
Reduction, friction disc wear amount is bigger, and the pressing force being applied on friction pairs of brake is smaller, and the braking moment of brake is also got over
It is small, necessarily cause the brake apparatus that cannot provide enough braking moments, the normal work for necessarily affecting coalcutter is braked, and band
Carry out the security risk of coalcutter work.
Summary of the invention
In place of overcoming the shortcomings of the prior art, a kind of hydraulic system of permanent braking moment is provided
Dynamic device, the Hydraulic brake structure is reasonable, easy to operate
Its principle is that the secondary pressing force N (brake force) of the friction of the brake is spring force PBulletWith hydraulic coupling PBulletCollective effect
As a result, brake pressing force N is equal to spring force P when brakeBulletWith hydraulic coupling PIt unloadsThe difference of (pressure unloading when braking)
Value, i.e. N=PBullet-PIt unloads； PIt unloadsSize can be adjusted according to abrasion loss by proportional pressure control valve in real time, work as PBulletBecome smaller with abrasion loss
When, PIt unloadsAlso become smaller therewith, so that PBullet-PIt unloadsEqual to steady state value, brake pressing force N is always constant constant of a size
Power realizes permanent braking moment braking, to guarantee the effective torque and brake safe of brake.
The technical scheme is that a kind of disk brake of perseverance braking moment, in the rear cover close to two piston walls
Locate it is each fill a laser range sensor, the sensor surveyed away from being passed in the single-chip microcontroller in control cabinet by signal wire, it is single
Piece machine first judges received signal, if abrasion loss is greater than greatest wear amount, single-chip microcontroller controls proportional pressure control valve and produces
A raw lesser pressure PIt unloads, so that the brake force P of tripping springBulletThe hydraulic coupling P being far longer than in oil circuitIt unloads, spring will friction
Piece compresses, and brake enters fuel feeding band-type brake blocking.If abrasion loss is less than greatest wear amount, make even to surveyed abrasion loss
Mean value, and corresponding umber of pulse is exported, and then control digital regulation resistance and export different voltage, this voltage is amplified simultaneously
It is compensated according to error caused by each transmission stage, then by the control terminal of this voltage access proportional pressure control valve, is led to
Cross hydraulic fluid pressure P in proportional pressure control valve control piperIt unloads, this pressure acts on the another side of piston, and with tripping spring
Elastic force PBulletDifference be a constant force.
The present invention can adjust overflow valve pressure P according to different abrasion lossesIt unloads, when friction disc wear amount is bigger,
It controls proportional pressure control valve and generates a lesser pressure PIt unloads；When friction disc wear amount is smaller, so that proportional pressure control valve generates
Biggish pressure PIt unloads.Guarantee elastic force P provided by tripping springBulletWith pressure P caused by proportional pressure control valveIt unloadsDifference be one
Constant force N, i.e. N=PBullet-PIt unloads.To ensure that the constant moment of force braking of the brake.
In the brake real work, when 2/2-way solenoid directional control valve is in closed state, when hydraulic oil is through fuel feed hole
After in into cylinder body, piston is pushed to move backward, liquid braking device declutches；After being connected at 2/2-way solenoid directional control valve, ratio
Overflow valve directly unloads oilhole with first and is connected, and piston is in tripping spring power PBulletWith hydraulic fluid pressure PIt unloadsResultant force N (N=PBullet-PIt unloads)
Under the action of move forward, by friction shim, friction plate assembly is compressed, and generates moment of friction, brake enters band-type brake shape at this time
State, machine are braked.
After friction disc wear, the distance X that laser range sensor is surveyed changes, and the distance surveyed passes through data line
It is transferred in single-chip microcontroller, single-chip microcontroller adjusts the pulse signal number of output according to this variation, so as to adjust digital regulation resistance
The voltage of output, the voltage are linked into proportional pressure control valve after voltage amplifier amplification and the error compensation in each stage
Control terminal passes through hydraulic fluid pressure P in proportional pressure control valve control piperIt unloads, this pressure PIt unloadsAct on the another side of piston, and with
The elastic force P of tripping springBulletDifference be a constant force N, braked with this constant force N, to realize permanent braking moment system
It is dynamic.
Concrete implementation method is such, abrasion loss measured by single-chip microcontroller reading precision distance measurement sensor, by this
Abrasion loss is divided by with greatest wear amount, a ratio K ((see formula (1)) for available current abrasion loss and greatest wear amount.
Since resistance and voltage are a linear relationships in digital regulation resistance, we only need to control number to obtain a biggish voltage
Big resistance is inscribed in word resistor, and therefore, the voltage swing of output can be controlled by the resistance sizes accessed in digital regulation resistance
System.
K: the ratio of current abrasion loss and greatest wear amount
L1: current abrasion loss
L: greatest wear amount
Abrasion loss increase when, braking moment reduce, it would be desirable to reduce hydraulic coupling caused by proportional pressure control valve, due to than
Electric current and pressure are proportional in example overflow valve, and the pressure that reduce proportional pressure control valve will namely reduce overflow valve control terminal
Electric current, i.e. the voltage that is exported of reduction digital regulation resistance needs to reduce the resistance sizes being inscribed in digital regulation resistance.
We determine voltage value size corresponding to current abrasion loss using formula (2), obtain corresponding to current abrasion loss
Umber of pulse, single-chip microcontroller exports this umber of pulse to digital regulation resistance, and controlling digital regulation resistance, to export current abrasion loss institute right
The voltage answered, to obtain hydraulic coupling P corresponding to proportional pressure control valve corresponding to current abrasion lossIt unloads。
Y1=Y × (1-K) (2)
Y1: single-chip microcontroller corresponding to current abrasion loss exports umber of pulse
Y: single-chip microcontroller corresponding to greatest wear amount exports umber of pulse
K: the ratio of current abrasion loss and greatest wear amount
After abrasion loss reaches greatest wear amount (6mm), single-chip microcontroller can control the pressure that proportional pressure control valve generates very little
PIt unloads, allow hydraulic oil oil return box, oil pressure off-load；At this point, piston is in spring force PBulletBy friction shim, friction plate assembly pressure under effect
Tightly, brake enters fuel feeding band-type brake blocking, hydraulic cannot discharge, and ensure that constant moment of force brakes N, to guarantee braking peace
Entirely.
Detailed description of the invention
Fig. 1 is the structural block diagram of control section of the present invention.
Fig. 2 is the program flow diagram of control section of the present invention.
Fig. 3 is the structural schematic diagram of one specific implementation example of the present invention.
Fig. 4 is the structural schematic diagram of control section of the present invention, and dotted line indicates the connection line of each section.
Figure label: 1-- front cover, 2-- friction shim, 3-- friction plate assembly, 4-- brake spring, 5-- space ring, 6--
Internal tooth washer, 7-- cylinder body, 8-- bolt, 9-- tripping spring, 10-- rear cover, 11-- sealing ring, 12-- proportional pressure control valve, 13--
Voltage amplifier, 14-- digital regulation resistance, 15-- single-chip microcontroller, 16-- electric pressure converter, 17-- laser range sensor, 18--
Piston, 19-- 2/2-way solenoid directional control valve, 20-- control cabinet.
Specific embodiment
Summary of the invention is described further below with reference to attached drawing, but the present invention is not limited only to implementation model shown in the drawings
Example.
Referring to attached drawing 1, the control section of the hydraulic brake of permanent braking moment is mainly by swashing described in type of the present invention
The control terminal group of ligh-ranging sensor 17, single-chip microcontroller 15, digital regulation resistance 14, voltage amplifier 13 and proportional pressure control valve 12
At.
Wherein high-precision laser range-finding sensor 17 is using Wuhan letter really long-range Science and Technology Ltd. H- produced
The sensor of TP5027 model, precision 0.01mm, the power supply of 24V, applies current elder generation in the directly external coalcutter of power supply
Into Digitization Background suppression technology, substantially increase measurement accuracy and anti-interference ability, EMI shielding, stable output signal, knot
Real industrial plastic shell, the degree of protection of IP67, antivibration impact capacity is strong, and outer dimension is small, is easily installed, and setting function is neat
Entirely, easy to operate, RS485 numeral output function is had, which is suitble to use under the high-precision industrial occasions of short distance.
The CPU of single-chip microcontroller 15 uses STMicroelectronics company STM32F205 chip produced, coalcutter
Minimum voltage in system is 5V, therefore is converted into+5V using the 5V/3V high-performance voltage stabilizing chip TPS7333Q of TI company
+ 3.3V is used for single-chip microcontroller.
Digital regulation resistance 14 use X9313 model, X9313 be technical grade 32 tap digital potentiometers, by VH termination+
5V, VL ground connection.The adjustable voltage of 0~+5V is exported from the end VW.Its output voltage is determined by the umber of pulse that single-chip microcontroller is given.
The voltage that voltage amplifier 13 is exported digital regulation resistance 14 carries out a certain proportion of amplification, wherein this ratio
Error of the coefficient also with each transmission link before has relationship, is overflow by calculating to front links error and ratio
The voltage rating of stream 12 proportional amplifier of valve determines specific amplification factor.
The control terminal of proportional pressure control valve 12 is proportional amplifier, and the output parameter of proportional amplifier is electricity-mechanical transducer
Electric current, the electric current is directly proportional to amplifier input voltage (output voltage of voltage amplifier).
Referring to attached drawing 2, the program flow diagram of the liquid braking device control section of permanent braking moment described in type of the present invention is such as
Shown in Fig. 2.It after single-chip microcontroller starting, is initialized, relevant control register and data register is carried out initial first
Change setting, carry out the real-time acquisition of abrasion loss after setting up by high-precision laser range-finding sensor 17, single-chip microcontroller 15 will be ground
Damage amount is judged after reading, and is seen if there is abrasion loss and has been had reached maximum value.If not reaching greatest wear amount, then
Two abrasion losses of reading are averaged, it is corresponding to be inputted to the input terminal of digital regulation resistance according to this average abrasion amount
Voltage.
Referring to attached drawing 3, the liquid braking device of permanent braking moment described in type of the present invention includes front cover 1, and friction shim 2 rubs
Pad component 3, brake spring 4, space ring 5, ring gear 6, cylinder body 7, piston 18, tripping spring 9, rear cover 10, laser ranging pass
Sensor 17, single-chip microcontroller 15, the equal components of proportional pressure control valve 12.Wherein by friction shim 2, friction plate assembly 3 (with tractive unit motor tooth
Wheel shaft be connected) and ring gear 6 constitute the equipment of brake；System is constituted by two pistons 18, cylinder body 7, tripping spring 9
The power device of dynamic device；By be arranged in laser range sensor 17 inside control cabinet 20, single-chip microcontroller 15, electric pressure converter 16,
2/2-way solenoid directional control valve 19 on digital regulation resistance 14, voltage amplifier 13, proportional pressure control valve 12 and rear cover 10 is constituted
Control device.
18 outer diameter of piston has stairstepping wall surface, and one end is connected by friction shim 2 with friction plate assembly 3, the other end
Connected by tripping spring 9 with rear cover 10, for 7 coaxial package of cylinder body outside piston 18, inner wall has the ladder cooperated with piston
Type wall surface is radially provided with the oil inlet between piston and cylinder body step type facade in 7 upper end edge of cylinder body, leans on equipment in cylinder body 7
One section on be provided with a unloading port.This unloading port is connected to 2/2-way solenoid directional control valve 19, which changes
It is connected to the oil outlet of valve 19 with the oil inlet of proportional pressure control valve 12.
In the brake real work, when 2/2-way solenoid directional control valve 19 is in closed state, hydraulic oil through first into
After oilhole enters in cylinder body 7, piston 18 is pushed to move backward, liquid braking device declutches；The conducting of 19 reversal valve of 2/2-way electromagnetism
Afterwards, piston moves forward under the effect of tripping spring power, and by friction shim 2, friction plate assembly 3 is compressed, and generates moment of friction, this
When brake enter band-type brake state, machine is braked.
After friction disc wear, the distance X that laser range sensor 17 is surveyed changes, and the distance surveyed passes through data
Line is transferred in single-chip microcontroller 15, if abrasion loss is less than greatest wear amount, is averaged to surveyed abrasion loss, and export correspondence
Umber of pulse, so as to adjust digital regulation resistance 14 export voltage, the voltage by voltage amplifier 13 amplification and each stage
Error compensation after, be linked into the control terminal of proportional pressure control valve 12.Pass through hydraulic fluid pressure P in proportional pressure control valve control piperIt unloads,
PIt unloadsThe another side for acting on piston, by the monitoring to abrasion loss, to adjust hydraulic coupling P caused by proportional pressure control valveIt unloads, allow system
Move the brake force P of springBulletWith hydraulic coupling PIt unloadsDifference be a constant force N, i.e. N=PBullet-PIt unloads.It is made with this constant force N
It is dynamic, to realize permanent braking moment braking.
When abrasion loss reach greatest wear amount (6mm) after, single-chip microcontroller 15 can control proportional pressure control valve 12 generate it is lesser
Pressure PIt unloads, allow hydraulic oil oil return box, oil pressure off-load；At this point, spring force P of the piston 18 in tripping spring 9BulletBy friction pad under effect
Piece 2, friction plate assembly 3 compress, and brake enters fuel feeding band-type brake blocking, hydraulic cannot discharge, and ensure that constant moment of force is braked,
To guarantee brake safe.
Claims (2)
1. a kind of liquid braking device of perseverance braking moment, including equipment, power device and control device, characterized in that work
Make device to be made of friction shim (2), friction plate assembly (3) and the ring gear (6) after front cover (1) is arranged in；Power device by
Two pistons (18), cylinder body (7) and tripping spring (9) composition after equipment is set；Control device is controlled by being arranged in
The internal laser range sensor (17) of case (20), single-chip microcontroller (15), electric pressure converter (16), digital regulation resistance (14), voltage
2/2-way solenoid directional control valve (19) composition on amplifier (13), proportional pressure control valve (12) and rear cover (10)；
Two piston (18) outer diameters all have stairstepping wall surface, and one end passes through friction shim (2) and friction plate assembly (3) phase
Even, the other end is connected by tripping spring (8) with rear cover (10), and one is respectively filled at the rear cover close to two piston (18) walls and is swashed
Ligh-ranging sensor (17)；
Cylinder body (7) coaxial package piston (18) outside, inner wall has the stepped wall surface that cooperates with piston (18), in cylinder body
(7) upper end edge is radially provided with the first oil inlet between piston and cylinder body step type wall surface, in cylinder body (7) by equipment one end
On valve opening, be radially provided with one pass to cylinder body (7) outside first unload oilhole, first unloads oilhole by 2/2-way electromagnetism
After reversal valve (19), it is connected to the second oil inlet of proportional pressure control valve (12)；
The distance that two laser range sensors (17) are surveyed passes to the internal single-chip microcontroller (15) of control cabinet (20) by signal wire,
Single-chip microcontroller (15) first judges received signal, if abrasion loss is greater than greatest wear amount, single-chip microcontroller (15) controls ratio
Example overflow valve (12) generates a lesser braking oil pressure, so that the brake force P of tripping spring (9)BulletIt is far longer than in oil circuit
Braking oil pressure PIt unloads, tripping spring (9) compresses friction shim (2), and brake enters fuel feeding band-type brake blocking；
If abrasion loss is less than greatest wear amount, surveyed abrasion loss is averaged, single-chip microcontroller (15) adjusts and exports correspondence
Umber of pulse, and then control digital regulation resistance (14) and export different voltage, the voltage is by voltage amplifier amplification and each
After the error compensation in stage, it is linked into the control terminal of proportional pressure control valve (12), control proportional pressure control valve (12) generates braking oil pressure；
When abrasion loss is smaller, the brake force P of tripping spring (9)BulletIt is bigger, proportional pressure control valve (12) are controlled at this time generates one
A braking oil pressure, brake force P provided by tripping spring (9)BulletWith braking oil pressure P caused by proportional pressure control valveIt unloadsDifference be
One steady state value N, i.e. N=PBullet-PIt unloads；When abrasion loss increases, brake force PBulletReduce, at this time control proportional pressure control valve (12) generate compared with
The difference N of small braking oil pressure, brake force and hydraulic coupling provided by tripping spring (9) is constant all the time；Therefore, when abrasion loss is small
When greatest wear amount, realize no matter the abrasion loss of friction plate be it is how many, perseverance is realized by control proportional pressure control valve (12)
Dynamic braking realizes permanent braking moment braking.
2. the liquid braking device of perseverance braking moment as described in claim 1, characterized in that permanent braking moment braking method is:
Single-chip microcontroller (15) reads abrasion loss measured by precision distance measurement sensor (17), this abrasion loss and greatest wear amount are divided by,
Obtain a ratio K of current abrasion loss Yu greatest wear amount；
K: the ratio of current abrasion loss and greatest wear amount；L1: current abrasion loss；L: greatest wear amount；
Voltage value size corresponding to current abrasion loss is determined using formula (2), obtains umber of pulse corresponding to current abrasion loss,
Y1=Y × (1-K) (2)
Y1: single-chip microcontroller corresponding to current abrasion loss exports umber of pulse
Y: single-chip microcontroller corresponding to greatest wear amount exports umber of pulse
K: the ratio of current abrasion loss and greatest wear amount
This umber of pulse is exported and is given digital regulation resistance (14) by single-chip microcontroller (15), the current abrasion of control digital regulation resistance (14) output
The corresponding voltage of amount, to obtain hydraulic coupling P corresponding to proportional pressure control valve corresponding to current abrasion loss (12)It unloads；
After abrasion loss reaches greatest wear amount 6mm, single-chip microcontroller (15) can control the pressure that proportional pressure control valve (12) generate very little
Power PIt unloads, allow hydraulic oil oil return box, oil pressure off-load；At this point, piston (18) is in spring force PBulletBy friction shim (2) and friction under effect
Piece component (3) compresses, and brake enters fuel feeding band-type brake blocking, hydraulic cannot discharge, and ensure that constant moment of force brakes N, thus
Guarantee brake safe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810083977.2A CN108412921B (en) | 2018-01-29 | 2018-01-29 | A kind of liquid braking device of perseverance braking moment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810083977.2A CN108412921B (en) | 2018-01-29 | 2018-01-29 | A kind of liquid braking device of perseverance braking moment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108412921A CN108412921A (en) | 2018-08-17 |
| CN108412921B true CN108412921B (en) | 2019-06-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810083977.2A Expired - Fee Related CN108412921B (en) | 2018-01-29 | 2018-01-29 | A kind of liquid braking device of perseverance braking moment |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3893549A (en) * | 1974-03-25 | 1975-07-08 | Gen Motors Corp | Brake apply and release mechanism |
| BRPI0605236A (en) * | 2006-12-06 | 2008-07-22 | Weatherford Ind E Com Ltda | remote braking system |
| CN104443428B (en) * | 2014-11-27 | 2016-08-24 | 航宇救生装备有限公司 | Normally closed type controlled hydraulic brake gear |
| CN105151283B (en) * | 2015-09-15 | 2017-05-24 | 西安航空制动科技有限公司 | Control method for aircraft carbon-ceramic wheel braking system with adjustable maximum braking pressure |
| CN205639390U (en) * | 2016-05-13 | 2016-10-12 | 戴勤彬 | Automatic screw thread formula machinery disc -Brake device of compensation |
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2018
- 2018-01-29 CN CN201810083977.2A patent/CN108412921B/en not_active Expired - Fee Related
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| CN108412921A (en) | 2018-08-17 |
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