CN107953874A - A kind of automatically controlled emergency braking system for pneumatic brake - Google Patents
A kind of automatically controlled emergency braking system for pneumatic brake Download PDFInfo
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- CN107953874A CN107953874A CN201711409089.7A CN201711409089A CN107953874A CN 107953874 A CN107953874 A CN 107953874A CN 201711409089 A CN201711409089 A CN 201711409089A CN 107953874 A CN107953874 A CN 107953874A
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- valve
- brake
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- gas
- switch
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/24—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being gaseous
- B60T13/26—Compressed-air systems
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/66—Electrical control in fluid-pressure brake systems
- B60T13/68—Electrical control in fluid-pressure brake systems by electrically-controlled valves
- B60T13/683—Electrical control in fluid-pressure brake systems by electrically-controlled valves in pneumatic systems or parts thereof
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Braking Systems And Boosters (AREA)
Abstract
The present invention relates to brake system technical field, disclose a kind of automatically controlled emergency braking system for pneumatic brake, including main brake valve, front axle brake gas circuit, rear axle braking gas circuit and trailer braking protection valve gas circuit, further include automatically controlled stacked switch, the end of main brake valve is equipped with foot pedal, and travel switch is correspondingly arranged on below foot pedal；Being internally provided between the first conversion gas chamber and the first conversion gas chamber and rear venthole for the upper valve body is connected with main conversion air valve switch；Proportion relay valve is equipped with front axle brake gas circuit, rear axle braking gas circuit and trailer braking protection valve gas circuit, urgent electromagnetic gas valve is connected between the air admission hole of proportion relay valve and its control hole；Being internally provided between the second conversion gas chamber and the second conversion gas chamber and the venthole of proportion relay valve for proportion relay valve is connected with secondary conversion air valve switch, a variety of driving models can freely be changed to adapt to different road conditions, improve the response time of skidding and by the automatically controlled purpose for directly controlling emergency braking.
Description
Technical field
The present invention relates to the technical field of brake system, and in particular, to a kind of automatically controlled emergency brake for pneumatic brake
System.
Background technology
The technology that existing commercial heavy vehicle uses is with reference to American-European countries and international brake system, brake
The export ratio of main valve is constant, and the work for the relay valve being connected with brake main valve is also constant.Wherein, brake main valve exists
Skidding is carried out to the wheel hub of automobile by its two internal brake gas circuit during use, during skidding,
Driver steps on mandril, top rod driving tip-lever support downlink by foot pedal, and tip-lever support connects front brake gas during downlink
Road, front brake gas circuit by wheel cylinder carry out skidding, front brake gas circuit connect after air pressure promote lower piston, lower piston therewith
The downlink under gas pressure, connects rear braking gas circuit, and rear braking gas circuit carries out skidding also by wheel cylinder；Relay valve belongs to vapour
A part for car gas braking system, in the braking system of truck, relay valve, which rises, shortens reaction time and pressure foundation
The effect of time.Relay valve air inlet connects gas receiver, and gas outlet connects brake chamber.When brake pedal, brake valve
Output pressure is inputted as the control pressure of relay valve, under control pressure effect, intake valve is pushed open, then compressed air is just
Brake chamber is directly entered by air inlet by gas receiver, and without flowing through brake valve, this substantially reduces filling for brake chamber
Air pipe, accelerates the gas replenishment process of gas chamber.
Technological deficiency existing for existing brake system is as follows：
(1) the use feel braked in existing brake system is heavy, reaction response is slow, foot valve stroke is big and brake away from
From big；
(2) existing brake can only be directed to certain road conditions and use, and the adaptability of corresponding complex road condition is poor, it is impossible to according to
Different road conditions carry out the conversion of adaptability；
(3) existing brake system causes pipeline due to during skidding, being influenced be subject to length of wagon
Longer, low-response, delay are serious in the case of emergency brake；
(4) existing brake system easily makes it produce maintenance mistaken diagnosis without self-test baric systerm；
(5) existing brake system is in the case of emergency brake, it is impossible to directly makes relay valve by electric control solenoid valve
Output pressure achievees the purpose that directly to brake.
The content of the invention
To improve above-mentioned technical problem, the present invention provides a kind of automatically controlled emergency braking system for pneumatic brake to reach
A variety of driving models can freely be changed to adapt to different road conditions, improve the response time of skidding and by automatically controlled direct
The purpose of emergency braking is controlled, it is heavier to improve existing brake system feel of foot pedal in braking procedure, brake
Low-response causes braking distance big and lacks by automatically controlled the problem of directly carrying out emergency braking.
In order to realize above-mentioned technique effect, technical solution provided by the present invention is：It is a kind of to be used for the automatically controlled tight of pneumatic brake
Emergency stopping system, including main brake valve, front axle brake gas circuit, rear axle braking gas circuit and trailer braking protection valve gas circuit, the main brake valve
Including upper valve body and lower valve body, the upper valve body is equipped with rear air admission hole and rear venthole, and lower valve body is equipped with preceding air admission hole and advance
Stomata, further includes automatically controlled stacked switch, and the end of the main brake valve is equipped with foot pedal, is correspondingly arranged on below foot pedal
Travel switch；Being internally provided between the first conversion gas chamber and the first conversion gas chamber and rear venthole for the upper valve body connects
There is main conversion air valve switch；Proportional servo is all provided with the front axle brake gas circuit, rear axle braking gas circuit and trailer braking protection valve gas circuit
Valve, is connected with urgent electromagnetic gas valve between the air admission hole of proportion relay valve and its control hole；The inside of the proportion relay valve is set
Have and secondary conversion air valve switch is connected between the second conversion gas chamber and the second conversion gas chamber and the venthole of proportion relay valve；
The travel switch and urgent electromagnetic gas valve are electrically connected with the automatically controlled stacked switch respectively.
Further, the inside of the upper valve body offers plunger shaft, and plunger shaft is set to the inside of stepped cavity and stepped cavity
Main piston is equipped with, stepped cavity includes superposed first stepped hole and the second stepped hole positioned at lower part, the main piston
Be set to ladder circle column structure, the enlarged diameter section of main piston matches with the first stepped hole, the end of reduced diameter section with it is described on
The end of valve is corresponding and reduced diameter section is equipped with the piston barrel to match with the second stepped hole；The one of the piston barrel
The first conversion gas chamber is formed between side and the larger diameter end of main piston, is formed between opposite side and the bottom of plunger shaft
Gas chamber；Connected between the first conversion gas chamber and rear venthole by pipeline, and pipeline is equipped with the main conversion gas
Threshold switch.
Further, the first return bullet is equipped between the bottom of the larger diameter end of the main piston and first stepped hole
Spring, and the internal diameter of the first return spring is more than the outside diameter of the piston barrel.
Further, the proportion relay valve includes servo upper valve body and servo lower valve body, the servo upper valve body it is interior
Portion is equipped with control piston chamber, and control piston chamber is connected with the control hole of servo upper valve body, and the mounted inside of control piston chamber has work
Font piston；The I-shaped piston includes piston rod, is connected to the big piston and valve piston at piston rod both ends, institute
State big piston with control piston chamber to match, the outer cover of valve piston is equipped with piston sleeve, and piston sleeve is assemblied in control piston
The inside of chamber；The second conversion gas chamber is formed between the piston sleeve and big piston, the second conversion gas chamber passes through pipe
Road is connected with the venthole of servo lower valve body and the pipeline is equipped with the secondary conversion air valve switch；The servo lower valve body into
Connected between stomata and the control hole of servo upper valve body by pipeline, and the pipeline is equipped with the urgent electromagnetic gas valve；It is described
The venthole of servo lower valve body is connected with Pressure monitoring table.
Further, the second return spring is equipped between the big piston and the piston sleeve, the second return spring
Internal diameter is more than the outside diameter of the valve piston.
Further, further include close to switch and vehicle anti-collision radar, the outer wall that upper valve body is assemblied in close to switch
On, brake indicating lamp is connected with close to one end of switch, the other end is electrically connected with the automatically controlled stacked switch；The vehicle anti-collision
Radar is connected with processor, and processor is electrically connected with the automatically controlled stacked switch.
Further, the proportion relay valve includes preceding proportion relay valve, rear proportion relay valve and trailer proportion relay valve,
The preceding proportion relay valve, rear proportion relay valve and trailer proportion relay valve brake gas circuit with front axle brake gas circuit, rear axle respectively
Connected with trailer braking protection valve gas circuit, the secondary conversion air valve switch include respectively with preceding proportion relay valve, rear proportion relay valve and extension
Preceding secondary conversion air valve switch, rear secondary conversion air valve switch and the secondary conversion air valve of trailer of car proportion relay valve assembly connection are opened
Close；The urgent electromagnetic gas valve, which includes assembling with preceding proportion relay valve, rear proportion relay valve and trailer proportion relay valve respectively, to be connected
Preceding urgent electromagnetic gas valve, rear urgent electromagnetic gas valve and the urgent electromagnetic gas valve of trailer connect.
Further, the front axle brake gas circuit includes front brake air accumulator, the venthole point of the front brake air accumulator
Do not connected with the preceding air admission hole of main brake valve and the air admission hole of preceding proportion relay valve；The preceding venthole of the main brake valve and preceding ratio
The control hole connection of example relay valve.
Further, the rear axle braking gas circuit includes rear braking air accumulator, the venthole point of the rear braking air accumulator
Do not connected with the rear air admission hole of main brake valve and the air admission hole of rear proportion relay valve；The rear venthole of the main brake valve and rear ratio
The control hole connection of example relay valve.
Further, the trailer braking protection valve gas circuit includes trailer brake gas tank, trailer control throttle valve, the trailer control
First air admission hole of throttle valve processed, the second air admission hole, the 3rd air admission hole respectively the preceding venthole with main brake valve, rear venthole with
And the venthole connection of trailer brake gas tank；The venthole of the trailer control throttle valve and the outlet of trailer brake gas tank
Hole is connected with the control hole of trailer proportion relay valve and the air admission hole of trailer proportion relay valve respectively.
Compared with the prior art, the beneficial effects of the invention are as follows：
1. using in emergency braking system provided by the present invention, main brake valve can be made by automatically controlled main conversion air valve switch
When gas circuit is connected, the area in stress recoil section switches over inside it, also can be by automatically controlled inside same proportion relay valve
Pair conversion air valve switch switches over the area in the stress recoil section of piston during the connection of its inner air path, by above-mentioned to master
Conversion air valve switch and secondary conversion air valve switch connect or disconnect, make automobile in driving procedure for sleet, empty wagons or
The switching of adaptability is carried out in the case of the difference road conditions such as person's heavy duty, can preferably use feel of the driver to foot pedal
It is adjusted, the stroke of foot pedal reduces, and braking distance also further shortens, and to the area in different stress recoil sections
Switch over, to lift the adaptability of whole brake system, strengthen the security performance of brake；
2. can directly it be connected with control hole by the air admission hole in automatically controlled urgent electromagnetic gas valve comparative example relay valve, to reach
Proportion relay valve provides air pressure with skidding to each wheel cylinder of automobile, reduces in the case of emergency brake, each ratio
The dependence of pipeline air pressure of the example relay valve to main brake valve, improves response speed of the whole brake system in braking procedure
Degree；
3. setting travel switch below the foot pedal of main brake valve, when being in an emergency, driver will ride
Plate steps on extreme position to touch travel switch, and travel switch will directly connect each urgent electromagnetic gas valve, so that each
Proportion relay valve connects gas circuit to carry out emergency brake braking to automobile, and due to being set on the venthole of each proportion relay valve
Pressure monitoring table is equipped with, can be assessed and be monitored with the performance to emergency brake by observing each Pressure monitoring table, it is convenient
Driver and maintenance personal are observed and overhaul.
Brief description of the drawings
Fig. 1 is the integral stop gas circuit connection relation provided by the present invention for the automatically controlled emergency braking system of pneumatic brake
Figure；
Fig. 2 is the structure diagram of upper valve body in the automatically controlled emergency braking system provided by the present invention for pneumatic brake；
Fig. 3 is the schematic cross-sectional view of upper valve body in the automatically controlled emergency braking system provided by the present invention for pneumatic brake；
Fig. 4 is the section view signal of proportion relay valve in the automatically controlled emergency braking system provided by the present invention for pneumatic brake
Figure；
Fig. 5 is the close-up schematic view of Fig. 3；
Fig. 6 is the close-up schematic view of Fig. 1.
Embodiment
The present invention is further described in detail with reference to specific embodiment, following word is intended to indicate that this hair
Protection domain that is bright, being not intended to limit the present invention.
As shown in figs 1 to 6, the present invention can be implemented as follows, a kind of automatically controlled emergency brake system for pneumatic brake
System, including main brake valve 17, front axle brake gas circuit, rear axle braking gas circuit and trailer braking protection valve gas circuit, the main brake valve 17 include
Upper valve body 1 and lower valve body, the internal activity of the main piston 3 are equipped with tip-lever support 15, the end and main piston 3 of tip-lever support 15 it
Between connected by rubber spring 16, brake pedal plate 18 pass through top rod driving tip-lever support 15 produce downward movement, the upper valve body 1
Equipped with rear air admission hole 4 and rear venthole 5, lower valve body is equipped with preceding air admission hole and preceding air admission hole, further includes automatically controlled stacked switch 43, institute
The end for stating main brake valve 17 is equipped with foot pedal, and travel switch 28 is correspondingly arranged on below foot pedal, when driver is by foot
Pedal step on extreme position when, foot pedal can touch the contact of travel switch 28；The upper valve body 1 is internally provided with
Main conversion air valve switch 11 is connected between first conversion gas chamber 9 and the first conversion gas chamber 9 and rear venthole 5；Before described
Is equipped with proportion relay valve in axis braking gas circuit, rear axle braking gas circuit and trailer braking protection valve gas circuit, the air admission hole of proportion relay valve with
Urgent electromagnetic gas valve is connected between its control hole, urgent electromagnetic gas valve can be by the air admission hole of proportion relay valve and ratio servo
The control hole of valve is connected, and the gas in the air admission hole of proportion relay valve pushes directly on the I-shaped piston inside proportion relay valve,
Reach directly braking purpose so as to which the air admission hole of proportion relay valve be connected with the venthole of proportion relay valve, it is not necessary to dependence from
The air pressure of main brake valve 17；The proportion relay valve be internally provided with the second conversion gas chamber and second conversion gas chamber with than
Secondary conversion air valve switch is connected between the venthole of example relay valve；In the present embodiment, using preferable mode, by main conversion gas
Threshold switch 11 and secondary conversion air valve switch are set to electromagnetic gas valve, the travel switch 28, main conversion air valve switch 11, urgent electromagnetism
Air valve and secondary conversion air valve switch are electrically connected with the automatically controlled stacked switch 43 respectively, and automatically controlled stacked switch 43 can be respectively to master
Conversion air valve switch 11, urgent electromagnetic gas valve and secondary conversion air valve switch are controlled, and in actual installation process, can also be turned main
Ventilation threshold switch 11 and secondary conversion air valve switch be set to Manual gas valve with instead of electromagnetic gas valve, and driver can directly manually
Mode is controlled main conversion air valve switch 11 and secondary conversion air valve switch.
The upper valve 2 being assemblied in inside upper valve body 1 is further included, the end of the upper valve 2 is equipped with to wrap and encloses, and bag circle is used to divide
Form exhaust valve port and intake valve port not between the end of main piston 3 and the mounting hole of upper valve body 1, the upper valve body 1 it is interior
Portion offers plunger shaft, and plunger shaft is set to stepped cavity and the mounted inside of stepped cavity has main piston 3, and main piston 3 can be in piston
The inside of chamber is free to slide along the progress of its axial direction, and stepped cavity includes superposed first stepped hole 6 and positioned at lower part
Second stepped hole 7, the main piston 3 are set to ladder circle column structure, the enlarged diameter section of main piston 3 and 6 phase of the first stepped hole
Match somebody with somebody and the enlarged diameter section outer cover of main piston 3 is equipped with sealing ring, the end of reduced diameter section is opposite with the end of the upper valve 2
Should, i.e. the end can offset tight fit with the bag circle of upper valve 2, and reduced diameter section with the second stepped hole 7 equipped with matching
Piston barrel 8, piston barrel 8 is by being shaped on the reduced diameter section of main piston 3；The side of the piston barrel 8 with
The first conversion gas chamber 9 is formed between the larger diameter end of main piston 3, upper gas is formed between opposite side and the bottom of plunger shaft
Chamber 10；Connected between the first conversion gas chamber 9 and rear venthole 5 by pipeline, and pipeline is equipped with the main conversion
Air valve switch 11, main conversion air valve switch 11, which can be realized, connects or disconnects pipeline.The larger diameter end of the main piston 3
The first return spring 12 is equipped between the bottom of first stepped hole 6, and the internal diameter of the first return spring 12 is more than described
The outside diameter of piston barrel 8, the first return spring 12 are used for the reset of main piston 3；The larger diameter end of the main piston 3 is along its periphery
Equipped with annular notch, baffle ring 13 is equipped with annular notch, the top of baffle ring 13 is equipped with mutually assembles with the inner wall of the plunger shaft
Opening clamp spring 14, opening clamp spring 14 be used for baffle ring 13 is carried out it is spacing, baffle ring 13 be used for main piston 3 is carried out it is spacing, ensure
Main piston 3 can stablize the inside for being installed on plunger shaft.
Its operation principle is as follows：
When automobile is under the operating status of heavily loaded high speed, driver is when carrying out skidding, it is necessary to brake foot-operated
The characteristics of feel of plate 18 is light, brake response is fast, main conversion air valve switch 11 is off, at this time, G mouthful and H mouths
Between mutually disconnect, H mouthfuls connect with I mouthfuls, and driver steps on foot pedal and braked, and foot pedal forces main piston 3 by tip-lever support
The elastic force of return spring is overcome to produce downward movement, during being somebody's turn to do, the gas inside the first conversion gas chamber 9 is subject to main piston 3
Larger diameter end compressing after, the first conversion 9 internal gas of gas chamber is emitted into air by second pipe through I mouthfuls, and main work
The smaller diameter end of plug 3 promotes upper valve 2, and the intake valve port d of upper valve 2 is opened at this time, and exhaust valve port e is closed, the pressure of air accumulator
Contracting gas air admission hole 4 after upper valve body 1 reaches the inside of supreme gas chamber 10, and the gas of upper gas chamber 10 is through stomata f after
Venthole 5, rear venthole 5 reach each wheel cylinder of rear braking, and each wheel cylinder carries out skidding, inside upper gas chamber 10
Air pressure gradually rise, air pressure produces the stress section of piston barrel 8 recoil active force, because of the stress section of piston barrel 8
Area is small, and under identical air pressure inside state, the recoil active force that main piston 3 is subject to is small, so that reaching driver steps on foot
The lighter purpose of the feel of pedal；Furthermore it is inflated after inside the upward gas chamber 10 of air admission hole 4, when master is pushed up in air pressure upwards
When the active force of piston 3 is equal with the precompression of rubber spring, main piston 3 starts to go back up to the flat of intake valve port d closings upwards
Weighing apparatus state, due to the 8 stress area of section of piston barrel inside upper gas chamber 10 it is small, it is necessary to the air pressure inside upper gas chamber 10 more
Height can be only achieved equilibrium state, i.e., for rear braking brake gas circuit air pressure higher, it is achieved thereby that the reaction of skidding
Speed is sensitiveer, the shorter effect of braking distance, reduces the muscle power output of driver.
When automobile is under unloaded or underloading low-speed run state, driver when carrying out skidding, it is necessary to
The feel weight of brake pedal plate 18, and it is of less demanding to brake response, by main conversion air valve switch 11 in an ON state, stress
The area increase in recoil section, under equal air pressure conditions, main piston 3 is subject to the recoil active force bigger of air pressure, drives at this time
The personnel of sailing, which step on foot pedal, has heavier feel, to be adapted to current driving states.
The proportion relay valve includes servo upper valve body 29 and servo lower valve body 30, and the inside of the servo upper valve body 29 is set
There is control piston chamber, control piston chamber is connected with the control hole 36 of servo upper valve body 29, and the mounted inside of control piston chamber has work
Font piston；The I-shaped piston includes piston rod 31, is connected to the big piston 32 at 31 both ends of piston rod and small
Piston 33, the big piston 32 match close to 36 side of control hole, big piston 32 with control piston chamber, valve piston 33
Outer cover is equipped with piston sleeve 34, and piston sleeve 34 is assemblied in the inside of control piston chamber, and the inside of the control piston chamber is opened
Equipped with the screw thread slot to match with piston sleeve 34, the internal diameter of screw thread slot is more than the internal diameter of the control piston chamber, piston
The end of sleeve 34 is pushed against on the bottom of the screw thread slot；Described the is formed between the piston sleeve 34 and big piston 32
Two conversion gas chamber 35, the second conversion gas chamber 35 are connected by pipeline with the venthole 40 of servo lower valve body 30 and on the pipeline
Equipped with the secondary conversion air valve switch；Between the air admission hole 39 of the servo lower valve body 30 and the control hole 36 of servo upper valve body 29
Connected by pipeline, and the pipeline is equipped with the urgent electromagnetic gas valve；The venthole of the proportion relay valve is communicated with air pressure
Table 27 is monitored, Pressure monitoring table 27 can be checked when carrying out emergency braking, and the venthole of each proportion relay valve can reach
To defined safe air pressure, to facilitate driver and maintenance personal to be observed and overhaul；The big piston 32 and the piston
It is equipped with the second return spring 38 between sleeve 34, the internal diameter of the second return spring 38 is more than the outside diameter of the valve piston 33, and second
Return spring 38 is used for the reset of I-shaped piston.
Its operation principle is as follows：
(1) for urgent electromagnetic gas valve：When urgent electromagnetic gas valve is connected (in the case of being used for emergency braking), compressed gas
Air admission hole 39 of the body through servo lower valve body 30 is directly entered to the control hole 36 of servo upper valve body 29, the control of servo upper valve body 29
Compressed gas is emitted into the inside of plunger shaft by hole 36, and I-shaped piston is subject to gas pressure to produce downward movement, I-shaped work
The end of plug promotes spool 37, and spool 37 produces downward movement, so that the air admission hole 39 and servo lower valve of servo lower valve body 30
The venthole 40 of body 30 connects, directly to be braked to each wheel cylinder；When urgent electromagnetic gas valve disconnects, proportion relay valve is extensive
Multiple normal working status is simultaneously acted by the output gas generation of main brake valve 17.
(2) air valve switch is changed for pair：When pair conversion air valve switch connect when, the venthole 40 of servo lower valve body 30 with
Second conversion gas chamber 35 of servo upper valve body 29 connects, control hole of the output pressure of main brake valve 17 through servo upper valve body 29
36 enter to gas chamber 41 on valve body (being made of the end of big piston 32 and the bottom of control piston chamber), and big piston 32 is in air pressure
Under the action of produce downward movement so that big piston 32 drives valve piston 33 to produce downward movement, valve piston 33 promotes spool 37
Downward movement is produced, the air admission hole 39 of servo lower valve body 30 is connected with the venthole 40 of servo lower valve body 30, at this time compressed gas
Air admission hole 39 of the body through servo lower valve body 30 enters to the valve body lower air chamber room 42 of proportion relay valve, at this point for proportion relay valve
The stress balance of internal I-shaped piston is：Pressure=the second turn that gas chamber 41 produces the section of big piston 32 on valve body
Take a breath what chamber 35 produced the section of valve piston 33 pressure+valve body lower air chamber room 42 that the ring section of big piston 32 produces
Pressure, at this time due to stress recoil section area it is larger, cause the movement reaction force of I-shaped piston larger, ratio after
Response speed is relatively slow during dynamic valve is connected, it is impossible to reaches the braking effect of high intensity；
When pair conversion air valve switch disconnects, the venthole 40 of servo lower valve body 30 and the second conversion of servo upper valve body 29
Gas chamber 35 disconnects, and control hole 36 of the output pressure through servo upper valve body 29 of main brake valve 17 enters to gas chamber 41 on valve body
(being made of the end of big piston 32 and the bottom of control piston chamber), big piston 32 produces downward movement under the influence of air pressure,
So as to which big piston 32 driving valve piston 33 produces downward movement, valve piston 33 promotes spool 37 to produce downward movement, by under servo
The air admission hole 39 of valve body 30 is connected with the venthole 40 of servo lower valve body 30, at this time air inlet of the compressed gas through servo lower valve body 30
Hole 39 enters to the valve body lower air chamber room 42 of proportion relay valve, at this point for the stress of the I-shaped piston inside proportion relay valve
Balance and be：Section of the gas chamber 41 to pressure=valve body lower air chamber room 42 that the section of big piston 32 produces to valve piston 33 on valve body
The pressure that face produces, at this time since the area in stress recoil section is smaller, causes the movement reaction force of I-shaped piston smaller,
Response speed is relatively fast during proportion relay valve is connected by the output gas of main brake valve 17, can reach high
The braking of intensity.
Close switch and vehicle anti-collision radar are further included, is equipped with the outer wall of the upper valve body 1 close to switch, described
1 side wall of upper valve body of main brake valve 17 offers notch, and notch is equipped with the end and upper valve body 1 close to switch and notch
Internal main piston 3 is corresponding, when stepping on foot pedal and being braked, 3 downward movement of main piston, so that the end close to switch is remote
From main piston 3, opened close to switch connect circuit at this time, brake indicating lamp 19, the other end are connected with close to one end of switch
It is electrically connected with the automatically controlled stacked switch 43；The vehicle anti-collision radar is connected with processor, processor and the automatically controlled combination
Switch be electrically connected, when reach in vehicle traveling process hazardous collision apart from when, vehicle anti-collision radar, vehicle anti-collision thunder will be triggered
Processor is fed back to up to by signal, and processor is converted to electric signal output to automatically controlled stacked switch, before automatically controlled stacked switch control
Urgent electromagnetic gas valve A1, rear urgent electromagnetic gas valve B1 and the urgent electromagnetic gas valve C1 of trailer carry out emergency brake braking.
The proportion relay valve includes preceding proportion relay valve 20, rear proportion relay valve 22 and trailer proportion relay valve 23, institute
Preceding proportion relay valve 20, rear proportion relay valve 22 and trailer proportion relay valve 23 is stated to brake with front axle brake gas circuit, rear axle respectively
Gas circuit is connected with trailer braking protection valve gas circuit, the secondary conversion air valve switch include respectively with preceding proportion relay valve 20, rear ratio servo
Preceding secondary conversion air valve switch A, rear secondary conversion air valve switch B and the trailer pair of 23 assembly connection of valve 22 and trailer proportion relay valve
Change air valve switch C；The urgent electromagnetic gas valve include respectively with preceding proportion relay valve 20, rear proportion relay valve 22 and trailer ratio
Preceding urgent electromagnetic gas valve A1, the rear urgent electromagnetic gas valve B1 and urgent electromagnetic gas valve C1 of trailer of example 23 assembly connection of relay valve.
The front axle brake gas circuit includes front brake air accumulator 25, the venthole of the front brake air accumulator 25 respectively with system
Connected between the preceding air admission hole of dynamic main valve 17 and the air admission hole of preceding proportion relay valve 20 by pipeline, preceding proportion relay valve 20 goes out
Stomata is connected with each front axle wheel cylinder respectively, and the premenstrual proportion relay valve 20 of venthole of front brake air accumulator 25 directly reaches front axle
Each front axle wheel cylinder；Pass through pipeline between the preceding venthole of the main brake valve 17 and the control hole 36 of preceding proportion relay valve 20
Connection, the gas of preceding venthole are used to be controlled preceding proportion relay valve 20.
Rear axle braking gas circuit includes rear braking air accumulator 24, the venthole of the rear braking air accumulator 24 respectively with system
Connected between the rear air admission hole 4 of dynamic main valve 17 and the air admission hole of rear proportion relay valve 22 by pipeline, rear proportion relay valve 22
Venthole is connected with each rear axle wheel cylinder respectively, and the venthole of rear braking air accumulator 24 is after proportion relay valve 22 directly reaches after
Each rear axle wheel cylinder of bridge；Pass through between the rear venthole 5 of the main brake valve 17 and the control hole 36 of rear proportion relay valve 22
Pipeline connects, and the gas of rear venthole 5 is used to be controlled rear proportion relay valve 22.
The trailer braking protection valve gas circuit includes trailer brake gas tank 23, trailer control throttle valve 26, the trailer control section
Flow the first air admission hole of valve 26, the second air admission hole, the 3rd the air admission hole preceding venthole with main brake valve 17, rear venthole 5 respectively
And connected between the venthole of trailer brake gas tank 23 by pipeline；The venthole and extension of the trailer control throttle valve 26
The venthole of car brake gas tank 23 respectively with the control hole 36 of trailer proportion relay valve 23 and trailer proportion relay valve 23 into
Connected between stomata by pipeline, the venthole of trailer control throttle valve 26 is controlled trailer proportion relay valve 23.
By in this present embodiment by main conversion air valve switch 11, preceding secondary conversion air valve switch A, rear secondary conversion air valve switch B
Electromagnetic gas valve is set to the secondary conversion air valve switch C of trailer, and the circuit connection in the present invention in automatically controlled stacked switch 43 is as follows：
Automatically controlled stacked switch 43 includes No. 1 switch, No. 2 switches, No. 3 switches, No. 4 switches and urgent relay, wherein, 1
Number switch, No. 2 switches and No. 3 switches secondary conversion air valve switch A, rear secondary conversion air valve switch B and trailer before corresponding control respectively
Pair conversion air valve switch C；No. 4 switches are used to control main conversion air valve switch 11.
When No. 1 switch, No. 2 switches, No. 3 switches and No. 4 switches are in connecting, into the road conditions system of sleet pattern
Dynamic brake system；
When No. 1 switch, No. 2 switches and No. 3 switches are respectively turned on, No. 4 when switching off, into the braking of empty wagons pattern
Brake system；
When No. 1 switch, No. 2 switches, No. 3 switches and No. 4 switches are in disconnecting, the braking into heavily loaded pattern is stopped
Car system；
Will it is described before urgent electromagnetic gas valve A1, the rear urgent electromagnetic gas valve B1 and urgent electromagnetic gas valve C1 of trailer and in succession
Connect, and both ends in parallel are connected with the both ends of travel switch 28, meanwhile, both ends in parallel are also connected with the urgent relay,
When any one in travel switch 28 and urgent relay is triggered, can carry out emergency brake braking, travel switch 28 or
The urgent relay of person urgent electromagnetic gas valve A1, rear urgent electromagnetic gas valve B1 and the urgent electromagnetic gas valve of trailer before can controlling at the same time
C1, to carry out skidding, when travel switch 28, which is in, to be connected, for checking whether emergency brake is under normal condition.
Any one skilled in the art the invention discloses technical scope in, can readily occur in change or
Replace, should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with the guarantor described in claim
Protect subject to scope.
Claims (10)
1. a kind of automatically controlled emergency braking system for pneumatic brake, including main brake valve, front axle brake gas circuit, rear axle braking gas circuit
With trailer braking protection valve gas circuit, the main brake valve includes upper valve body and lower valve body, and the upper valve body is equipped with rear air admission hole and rear outlet
Hole, lower valve body are equipped with preceding air admission hole and preceding air admission hole, it is characterised in that automatically controlled stacked switch is further included, the main brake valve
End is equipped with foot pedal, and travel switch is correspondingly arranged on below foot pedal；The upper valve body is internally provided with the first conversion
Main conversion air valve switch is connected between gas chamber and the first conversion gas chamber and rear venthole；The front axle brake gas circuit, after
Bridge is braked in gas circuit and trailer braking protection valve gas circuit and is equipped with proportion relay valve, connects between the air admission hole of proportion relay valve and its control hole
It is connected to urgent electromagnetic gas valve；The proportion relay valve is internally provided with the second conversion gas chamber and the second conversion gas chamber and ratio
Secondary conversion air valve switch is connected between the venthole of relay valve；The travel switch and urgent electromagnetic gas valve respectively with the electricity
Stacked switch is controlled to be electrically connected.
2. the automatically controlled emergency braking system according to claim 1 for pneumatic brake, it is characterised in that the upper valve body
Inside offers plunger shaft, and plunger shaft is set to stepped cavity and the mounted inside of stepped cavity has main piston, and stepped cavity is included positioned at upper
First stepped hole in portion and the second stepped hole positioned at lower part, the main piston are set to ladder circle column structure, main piston it is big
Diameter segment matches with the first stepped hole, the end of reduced diameter section is corresponding with the end of the upper valve and reduced diameter section on set
There is the piston barrel to match with the second stepped hole；Institute is formed between the side of the piston barrel and the larger diameter end of main piston
The first conversion gas chamber is stated, upper gas chamber is formed between opposite side and the bottom of plunger shaft；The first conversion gas chamber is with after
Connected between venthole by pipeline, and pipeline is equipped with the main conversion air valve switch.
3. the automatically controlled emergency braking system according to claim 2 for pneumatic brake, it is characterised in that the main piston
The first return spring is equipped between the bottom of larger diameter end and first stepped hole, and the internal diameter of the first return spring is more than institute
State the outside diameter of piston barrel.
4. the automatically controlled emergency braking system according to claim 1 for pneumatic brake, it is characterised in that the ratio servo
Valve includes servo upper valve body and servo lower valve body, and the servo upper valve body is internally provided with control piston chamber, control piston chamber with
The control hole connection of servo upper valve body, the mounted inside of control piston chamber have I-shaped piston；The I-shaped piston includes living
Plug connecting rod, the big piston and valve piston for being connected to piston rod both ends, the big piston matches with control piston chamber, small
The outer cover of piston is equipped with piston sleeve, and piston sleeve is assemblied in the inside of control piston chamber；The piston sleeve and big piston
Between form the second conversion gas chamber, the second conversion gas chamber is connected with the venthole of servo lower valve body by pipeline and this
Pipeline is equipped with the secondary conversion air valve switch；Lead between the air admission hole of the servo lower valve body and the control hole of servo upper valve body
Piping connects, and the pipeline is equipped with the urgent electromagnetic gas valve；The venthole of the servo lower valve body is connected with air pressure prison
Survey table.
5. the automatically controlled emergency braking system according to claim 4 for pneumatic brake, it is characterised in that the big piston with
The second return spring is equipped between the piston sleeve, the internal diameter of the second return spring is more than the outside diameter of the valve piston.
6. the automatically controlled emergency braking system according to claim 1 for pneumatic brake, it is characterised in that further include close open
Close and vehicle anti-collision radar, the close switch are assemblied on the outer wall of upper valve body, being connected with brake close to one end of switch refers to
Show lamp, the other end is electrically connected with the automatically controlled stacked switch；The vehicle anti-collision radar is connected with processor, processor with it is described
Automatically controlled stacked switch is electrically connected.
7. the automatically controlled emergency braking system according to claim 1 for pneumatic brake, it is characterised in that the ratio servo
Valve includes preceding proportion relay valve, rear proportion relay valve and trailer proportion relay valve, the preceding proportion relay valve, rear proportion relay valve
Connected respectively with front axle brake gas circuit, rear axle braking gas circuit and trailer braking protection valve gas circuit with trailer proportion relay valve, the secondary conversion
Air valve switch includes the preceding secondary conversion with preceding proportion relay valve, rear proportion relay valve and trailer proportion relay valve assembly connection respectively
Air valve switch, rear secondary conversion air valve switch and the secondary conversion air valve switch of trailer；The urgent electromagnetic gas valve include respectively with it is preceding
Proportion relay valve, the preceding urgent electromagnetic gas valve of rear proportion relay valve and trailer proportion relay valve assembly connection, rear urgent electromagnetism gas
Valve and the urgent electromagnetic gas valve of trailer.
8. the automatically controlled emergency braking system according to claim 7 for pneumatic brake, it is characterised in that the front axle brake
Gas circuit includes front brake air accumulator, the venthole of the front brake the air accumulator preceding air admission hole with main brake valve and preceding ratio respectively
The air admission hole connection of relay valve；The preceding venthole of the main brake valve is connected with the control hole of preceding proportion relay valve.
9. the automatically controlled emergency braking system according to claim 7 for pneumatic brake, it is characterised in that the rear axle braking
Gas circuit includes rear braking air accumulator, the venthole of the rear braking the air accumulator rear air admission hole with main brake valve and rear ratio respectively
The air admission hole connection of relay valve；The rear venthole of the main brake valve is connected with the control hole of rear proportion relay valve.
10. the automatically controlled emergency braking system according to claim 7 for pneumatic brake, it is characterised in that the trailer system
Road of taking offence includes trailer brake gas tank, trailer control throttle valve, the first air admission hole of trailer control throttle valve, second into
Stomata, the 3rd air admission hole respectively the preceding venthole with main brake valve, rear venthole and trailer brake gas tank venthole connect
It is logical；The venthole control with trailer proportion relay valve respectively of the venthole and trailer brake gas tank of the trailer control throttle valve
Drilling is connected with the air admission hole of trailer proportion relay valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711409089.7A CN107953874A (en) | 2017-12-22 | 2017-12-22 | A kind of automatically controlled emergency braking system for pneumatic brake |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711409089.7A CN107953874A (en) | 2017-12-22 | 2017-12-22 | A kind of automatically controlled emergency braking system for pneumatic brake |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107953874A true CN107953874A (en) | 2018-04-24 |
Family
ID=61956830
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711409089.7A Pending CN107953874A (en) | 2017-12-22 | 2017-12-22 | A kind of automatically controlled emergency braking system for pneumatic brake |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107953874A (en) |
Citations (25)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB643059A (en) * | 1944-10-31 | 1950-09-15 | Bendix Westinghouse Automotive | Improvements in or relating to fluid pressure control devices |
| US3929381A (en) * | 1974-03-11 | 1975-12-30 | Midland Ross Corp | Pneumatic brake system for a tractor-trailer vehicle including an anti-lock control valve in the trailer brake system |
| US3994536A (en) * | 1974-12-31 | 1976-11-30 | Wabco Westinghouse Gmbh | Brake-release accelerating device and automatic gradual-discharge fluid brake |
| EP0046166A1 (en) * | 1980-08-16 | 1982-02-24 | WABCO Westinghouse Fahrzeugbremsen GmbH | Load-dependently controlled two-pipe trailer brake installation |
| DE3232836A1 (en) * | 1982-09-03 | 1984-03-08 | Knorr-Bremse GmbH, 8000 München | ELECTROPNEUMATIC CONTROL DEVICE FOR THE AIR BRAKES OF RAIL VEHICLES |
| US4575157A (en) * | 1983-06-15 | 1986-03-11 | Wabco Westinghouse Fahrzeugbremsen Gmbh | Pneumatically controlled relay valve arrangements |
| JPH08295214A (en) * | 1995-04-26 | 1996-11-12 | Mitsubishi Motors Corp | Brake device for tractor |
| DE19641028A1 (en) * | 1996-10-04 | 1998-04-09 | Wabco Gmbh | Brake force control device that can be controlled depending on the load |
| EP0863825A1 (en) * | 1995-11-30 | 1998-09-16 | Zeftron, Inc. | Electronic pneumatic brake system |
| JPH1120676A (en) * | 1997-07-02 | 1999-01-26 | Hino Motors Ltd | Braking device of tractor |
| US6247764B1 (en) * | 1999-04-22 | 2001-06-19 | Haldex Brake Corporation | Full function valve for heavy duty semi-trailer brake systems |
| DE10120319A1 (en) * | 2001-04-26 | 2002-10-31 | Knorr Bremse Systeme | Pilot operated valve with a pressure equalization channel |
| CN2605166Y (en) * | 2002-08-02 | 2004-03-03 | 李彦波 | Electric controlled booster relay valve and its brake pipe system |
| CN2754950Y (en) * | 2004-06-22 | 2006-02-01 | 李金龙 | Emergent relay valve and trailer brake controller therewith |
| KR20070027804A (en) * | 2005-08-29 | 2007-03-12 | 현대자동차주식회사 | Brake system of refraction vehicle |
| CN201086708Y (en) * | 2007-09-07 | 2008-07-16 | 山东明水汽车配件厂 | Buffering relay valve of front axle |
| CN101372227A (en) * | 2008-09-18 | 2009-02-25 | 瑞立集团瑞安汽车零部件有限公司 | Emergency servo and ABS two-chamber servo integrated valve |
| DE102009059811B3 (en) * | 2009-12-21 | 2011-09-01 | Knorr-Bremse Systeme für Nutzfahrzeuge GmbH | Multi-channel pressure control module with only one pressure sensor |
| CN103359102A (en) * | 2013-07-30 | 2013-10-23 | 瑞立集团瑞安汽车零部件有限公司 | Trailer valve with throttling function |
| CN204870981U (en) * | 2015-07-14 | 2015-12-16 | 广州科密汽车电子控制技术股份有限公司 | Automatically controlled braking system of EBS gas braking |
| CN205131222U (en) * | 2015-12-04 | 2016-04-06 | 铁岭陆平专用汽车有限责任公司 | Trailer driving interlock |
| US20160229384A1 (en) * | 2013-09-24 | 2016-08-11 | Wabco Gmbh | Valve apparatus |
| WO2016172858A1 (en) * | 2015-04-28 | 2016-11-03 | 浙江科力车辆控制系统有限公司 | Electromagnetic foot valve applied to energy recycling system of new energy commercial vehicle |
| JP2017149263A (en) * | 2016-02-24 | 2017-08-31 | ナブテスコオートモーティブ株式会社 | Air supply system |
| CN207842917U (en) * | 2017-12-22 | 2018-09-11 | 易孝威 | A kind of automatically controlled emergency braking system for pneumatic brake |
-
2017
- 2017-12-22 CN CN201711409089.7A patent/CN107953874A/en active Pending
Patent Citations (25)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB643059A (en) * | 1944-10-31 | 1950-09-15 | Bendix Westinghouse Automotive | Improvements in or relating to fluid pressure control devices |
| US3929381A (en) * | 1974-03-11 | 1975-12-30 | Midland Ross Corp | Pneumatic brake system for a tractor-trailer vehicle including an anti-lock control valve in the trailer brake system |
| US3994536A (en) * | 1974-12-31 | 1976-11-30 | Wabco Westinghouse Gmbh | Brake-release accelerating device and automatic gradual-discharge fluid brake |
| EP0046166A1 (en) * | 1980-08-16 | 1982-02-24 | WABCO Westinghouse Fahrzeugbremsen GmbH | Load-dependently controlled two-pipe trailer brake installation |
| DE3232836A1 (en) * | 1982-09-03 | 1984-03-08 | Knorr-Bremse GmbH, 8000 München | ELECTROPNEUMATIC CONTROL DEVICE FOR THE AIR BRAKES OF RAIL VEHICLES |
| US4575157A (en) * | 1983-06-15 | 1986-03-11 | Wabco Westinghouse Fahrzeugbremsen Gmbh | Pneumatically controlled relay valve arrangements |
| JPH08295214A (en) * | 1995-04-26 | 1996-11-12 | Mitsubishi Motors Corp | Brake device for tractor |
| EP0863825A1 (en) * | 1995-11-30 | 1998-09-16 | Zeftron, Inc. | Electronic pneumatic brake system |
| DE19641028A1 (en) * | 1996-10-04 | 1998-04-09 | Wabco Gmbh | Brake force control device that can be controlled depending on the load |
| JPH1120676A (en) * | 1997-07-02 | 1999-01-26 | Hino Motors Ltd | Braking device of tractor |
| US6247764B1 (en) * | 1999-04-22 | 2001-06-19 | Haldex Brake Corporation | Full function valve for heavy duty semi-trailer brake systems |
| DE10120319A1 (en) * | 2001-04-26 | 2002-10-31 | Knorr Bremse Systeme | Pilot operated valve with a pressure equalization channel |
| CN2605166Y (en) * | 2002-08-02 | 2004-03-03 | 李彦波 | Electric controlled booster relay valve and its brake pipe system |
| CN2754950Y (en) * | 2004-06-22 | 2006-02-01 | 李金龙 | Emergent relay valve and trailer brake controller therewith |
| KR20070027804A (en) * | 2005-08-29 | 2007-03-12 | 현대자동차주식회사 | Brake system of refraction vehicle |
| CN201086708Y (en) * | 2007-09-07 | 2008-07-16 | 山东明水汽车配件厂 | Buffering relay valve of front axle |
| CN101372227A (en) * | 2008-09-18 | 2009-02-25 | 瑞立集团瑞安汽车零部件有限公司 | Emergency servo and ABS two-chamber servo integrated valve |
| DE102009059811B3 (en) * | 2009-12-21 | 2011-09-01 | Knorr-Bremse Systeme für Nutzfahrzeuge GmbH | Multi-channel pressure control module with only one pressure sensor |
| CN103359102A (en) * | 2013-07-30 | 2013-10-23 | 瑞立集团瑞安汽车零部件有限公司 | Trailer valve with throttling function |
| US20160229384A1 (en) * | 2013-09-24 | 2016-08-11 | Wabco Gmbh | Valve apparatus |
| WO2016172858A1 (en) * | 2015-04-28 | 2016-11-03 | 浙江科力车辆控制系统有限公司 | Electromagnetic foot valve applied to energy recycling system of new energy commercial vehicle |
| CN204870981U (en) * | 2015-07-14 | 2015-12-16 | 广州科密汽车电子控制技术股份有限公司 | Automatically controlled braking system of EBS gas braking |
| CN205131222U (en) * | 2015-12-04 | 2016-04-06 | 铁岭陆平专用汽车有限责任公司 | Trailer driving interlock |
| JP2017149263A (en) * | 2016-02-24 | 2017-08-31 | ナブテスコオートモーティブ株式会社 | Air supply system |
| CN207842917U (en) * | 2017-12-22 | 2018-09-11 | 易孝威 | A kind of automatically controlled emergency braking system for pneumatic brake |
Non-Patent Citations (3)
| Title |
|---|
| 郝新平;孙国栋;杨阳;: "中重型汽车制动系统密封性能浅析", 汽车运用, no. 12 * |
| 金明新，张荣贵: "超越式紧急继动阀的试验研究", 专用汽车, no. 03 * |
| 陆艺;徐博文;施岩;郭斌;: "客车制动系统动态模型研究及试验验证", 液压与气动, no. 04 * |
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