CN105416265B - Valve and working truck are protected in service brake - Google Patents
Valve and working truck are protected in service brake Download PDFInfo
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- CN105416265B CN105416265B CN201510901736.0A CN201510901736A CN105416265B CN 105416265 B CN105416265 B CN 105416265B CN 201510901736 A CN201510901736 A CN 201510901736A CN 105416265 B CN105416265 B CN 105416265B
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- valve
- service brake
- connector
- protection
- pressure limiting
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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
- B60T15/00—Construction arrangement, or operation of valves incorporated in power brake systems and not covered by groups B60T11/00 or B60T13/00
- B60T15/02—Application and release valves
- B60T15/025—Electrically controlled valves
- B60T15/028—Electrically controlled valves in hydraulic systems
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
- Braking Systems And Boosters (AREA)
- Regulating Braking Force (AREA)
Abstract
The invention discloses a kind of service brake protection valve and working trucks.Service brake protects valve to have the first connector for being connect with service brake valve and the second connector for being connect with checking cylinder; it includes handover module and pressure limiting module that valve is protected in service brake; handover module switches for controlling service brake protection valve between the first operating mode and the second operating mode; in the first operating mode; first connector is connected to by handover module with the second connector; in the second operating mode, the first connector is connected to the second connector by pressure limiting module.The service brake protects valve to control service brake by handover module and protects whether valve is protected service braking system; switching to the first operating mode service brake protects valve on the function of service braking system substantially without influence; overthrow accident caused by due to suddenly touching on the brake can be prevented or be avoided by pressure limiting module by switching to the second operating mode, and structure and control process are easy to realize.
Description
Technical field
The present invention relates to vehicular field, more particularly to a kind of service brake protection valve and working truck.
Background technology
The working truck that weight walking can be carried is higher to stability requirement, may cause during belt carrying running and incline
Turn over accident.
By taking empty container piling crane as an example, it is applied to port and pier, special portal-framed structure can be by container
It rises and rises to more than ten meters, therefore is higher to its stability requirement, and since it is usually in high-frequency job state, is also easy to produce and accidentally grasps
Make, thus in use especially belt carrying running when overthrow accident may occur.For example, suspender is in the process of moving
When high-order, easily there is overthrow accident if brake is too urgent.
In the prior art, the anti-tipping safeguard measure of empty container piling crane is that Set scale depressurizes on brake fluid line
Valve.In empty container piling crane driving process, by detecting vehicle travel speed, hanging box weight, door frame angle of inclination, heap height
The information such as machine hanging box height, the maximum skidding pressure requirements under control system real-time judge vehicle stable condition, control are stopped
The proportional pressure-reducing valve installed additional on vehicle oil circuit forms one and stablizes brake closed loop to control the maximum brake pressure of brake system
Control system.If brake pressure reaches the maximum pressure of system stable condition, control system sends out indicative sound-light alarm immediately,
Display shows dangerous information, and indicative alarm is carried out to operator, and otherwise alarm is automatic disappears.As control system judges to brake
Pressure is excessive, and with the danger tumbled, then controlling proportional pressure-reducing valve reduces brake pressure, makes empty container piling crane
Reduction of speed slides, system prompt alarm, and records precarious position.
In the implementation of the present invention, designer of the invention has found, the above prior art has following deficiency
Place：
1, it realizes difficult：The prior art is more difficult for the detection of key parameter, tumbles model and result of calculation is difficult to
Ensure consistent.
2, of high cost：Proportional pressure-reducing valve need to be increased in brake circuits and coherent detection element, cost are higher.
Invention content
The purpose of the present invention is to provide a kind of service brake protection valve and working trucks, it is intended to propose that one kind is easily achieved
Working truck protected mode to avoid or reduce because brake it is too urgent caused by overthrow accident.
First aspect present invention provides a kind of service brake and protects valve, the service brake protection valve have for driving
First connector of brake valve connection and the second connector for being connect with checking cylinder, the service brake protection valve includes cutting
Block and pressure limiting module are changed the mold, the handover module protects valve in the first operating mode and the second work for controlling the service brake
Switch between operation mode, in first operating mode, first connector is connected by the handover module and described second
Orifice, in second operating mode, first connector is connected with second connector by the pressure limiting module
It is logical.
Further, the handover module includes reversal valve, and the reversal valve includes the first hydraulic fluid port and the second hydraulic fluid port and has
There are the first operating position and the second operating position, the first hydraulic fluid port of the reversal valve to be connect with first connector, described
Two hydraulic fluid ports are connect with second connector, wherein its first hydraulic fluid port and the second oil in the first operating position of the reversal valve
Mouth connection, the service brake protection valve are in first operating mode；The second operating position of the reversal valve its
One hydraulic fluid port and the second hydraulic fluid port disconnect, and the service brake protection valve is in second operating mode.
Further, it in the case where the pressure of first connector is certain, works under second operating mode
The rate of pressure increase of the second connectors of Shi Suoshu be less than when working in this first operative mode described in the second connector
Rate of pressure increase；Or it in the case where the pressure of first connector is certain, works under second operating mode
The pressure of the second connectors of Shi Suoshu be less than when working in this first operative mode described in the second connector pressure.
Further, the handover module and the pressure limiting wired in parallel.
Further, the pressure limiting module includes a pressure limiting submodule or the different multiple pressure limiting submodules of pressure limiting ability
Block.
Further, the pressure limiting module includes the multiple pressure limiting submodule, and the service brake protection valve further includes
Selecting module, in second operating mode, the selecting module is used to select a limit in the multiple pressure limiting submodule
Submodule is pressed to be connected to first connector and second connector by the selected pressure limiting submodule.
Further, the selecting module includes multiple selection submodules, each selection submodule with it is at least one
The corresponding pressure limiting submodule connection.
Further, each selection submodule is connected in series to form correspondingly with a pressure limiting submodule
One pressure limiting branch, each pressure limiting branch circuit parallel connection.
Further, the pressure limiting submodule includes voltage-limiting element, wherein the input end of the voltage-limiting element and described the
One connector connects, and the outlet end of the voltage-limiting element is connect with second connector.
Further, the voltage-limiting element includes throttling set or decompressor.
Further, the pressure limiting submodule further includes the check valve being arranged in parallel with the voltage-limiting element, wherein described
The input end of check valve is connect with second connector, and the outlet end of the check valve is connect with first connector.
Second aspect of the present invention provides a kind of working truck, including service braking system, the service braking system include
Service brake valve and checking cylinder, wherein the service braking system further includes the row described in any one of first aspect present invention
Vehicle braking protection valve, the first connector of the service brake protection valve are connect with the service brake valve, the service brake
Second connector of protection valve is connect with the checking cylinder.
Further, the service braking system further includes that protection releases device, and the protection releases device for controlling
The service brake protection valve switches to first operating mode from second operating mode.
Further, it includes that protection releases pedal that the protection, which releases device, and the protection releasing pedal is set to described
In front of the driver seat of working truck, the protection releases the left side that pedal is located at the center line of the driver seat, wherein institute
It states protection and releases pedal and can control the service brake and valve is protected to switch to first work from second operating mode
Pattern.
Further, it further includes releasing the protection valve releasing that pedal is connect with the protection to control that the protection, which releases device,
Switch, the protection valve release control switch and are coupled with the handover module, and the protection releases pedal by controlling the guarantor
Shield valve releases the control switch control service brake protection valve and switches to first Working mould from second operating mode
Formula.
Further, the working truck is empty container piling crane.
Protect valve and working truck based on service brake provided by the invention, service brake protection valve include handover module and
Pressure limiting module, handover module control service brake protection valve switches between the first operating mode and the second operating mode, the
One operating mode, the first connector protect valve to be connected to the second connector by service brake, connect in the second operating mode, first
Interface is connected to the second connector by pressure limiting module.Service brake protection valve devises two independent modules, by cutting
Whether mold changing block control service brake protection valve is protected service braking system, after switching to the first operating mode, row
Vehicle braking protection valve, substantially without influence, can pass through pressure limiting mould to the function of service braking system after switching to the second operating mode
Block prevents or avoids overthrow accident caused by due to suddenly touching on the brake, and structure and control process are easy to realize.By the driving system
Between the service brake valve and checking cylinder of the service braking system that dynamic protection valve is installed on working truck, in operation when driving,
Vavle switching can be protected to the second operating mode service brake, then the hydraulic oil for carrying out bicycle brake valve subtracts by pressure limiting module
Enter checking cylinder after pressure, pressure limiting module changes brake pressure output characteristics, so that pressure output is become soft slow, so as to prevent
Or overthrow accident caused by due to suddenly touching on the brake is avoided, improve security performance when working truck belt carrying running.
By referring to the drawings to the detailed description of exemplary embodiment of the present invention, other feature of the invention and its
Advantage will become apparent.
Description of the drawings
Attached drawing described herein is used to provide further understanding of the present invention, and is constituted part of this application, this hair
Bright illustrative embodiments and their description are not constituted improper limitations of the present invention for explaining the present invention.In the accompanying drawings：
Fig. 1 is that the principle schematic of valve is protected in the service brake of first embodiment of the invention.
Fig. 2 is that valve liquid under the first operating mode and the second operating mode is protected in the service brake of first embodiment of the invention
The brake pressure time history plot of pressure oil.
Fig. 3 is that driving for the working truck of valve and protection releasing device is protected in the service brake with first embodiment of the invention
Sail indoor partial structural diagram.
Fig. 4 is that the principle schematic of valve is protected in the service brake of second embodiment of the invention.
Fig. 5 is that the principle schematic of valve is protected in the service brake of third embodiment of the invention.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Below
Description only actually at least one exemplary embodiment is illustrative, is never used as to the present invention and its application or makes
Any restrictions.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Lower obtained every other embodiment, shall fall within the protection scope of the present invention.
Unless specifically stated otherwise, positioned opposite, the digital table of the component and step that otherwise illustrate in these embodiments
It is not limited the scope of the invention up to formula and numerical value.Simultaneously, it should be appreciated that for ease of description, attached each portion shown in the drawings
The size divided not is to be drawn according to actual proportionate relationship.For technology, side known to person of ordinary skill in the relevant
Method and equipment may be not discussed in detail, but in the appropriate case, and the technology, method and apparatus should be considered as authorizing explanation
A part for book.In shown here and discussion all examples, any occurrence should be construed as merely illustrative, and
Not by way of limitation.Therefore, the other examples of exemplary embodiment can have different values.It should be noted that：Similar label
Similar terms are indicated in following attached drawing with letter, therefore, once it is defined in a certain Xiang Yi attached drawing, then subsequent attached
It need not be further discussed in figure.
For ease of description, herein can with use space relative terms, as " ... on ", " in ... top ",
" ... upper surface ", " above " etc., for describing such as a device shown in the figure or feature and other devices or spy
The spatial relation of sign.It should be understood that spatially relative term is intended to comprising the orientation in addition to device described in figure
Except different direction in use or operation.For example, if the device in attached drawing is squeezed, it is described as " in other devices
It will be positioned as " under other devices or construction after part or construction top " or the device of " on other devices or construction "
Side " or " under other devices or construction ".Thus, exemplary term " ... top " may include " ... top " and
" in ... lower section " two kinds of orientation.The device can also other different modes positioning (be rotated by 90 ° or be in other orientation), and
And respective explanations are made to the opposite description in space used herein above.
In the following description, so-called " preceding " side referred to where working truck headstock；" rear " refers to and " preceding "
Opposite side, " left side " and " right side " refer to the left and right directions in face of being formed when front.
As shown in Figure 1, Figure 4 and Figure 5, the service brake protection valve of the embodiment of the present invention has for connecting with service brake valve
The first connector connect and the second connector for being connect with checking cylinder, it includes handover module and pressure limiting that valve is protected in service brake
Module, handover module switches for controlling service brake protection valve between the first operating mode and the second operating mode, the
One operating mode, the first connector are connected to the second connector by handover module, in the second operating mode, the first connector with
Second connector is connected to by pressure limiting module.
Service brake protection valve devises two independent modules, and controlling service brake protection valve by handover module is
No to be protected to service braking system, after switching to the first operating mode, service brake protects valve to service braking system
Function substantially without influence, can prevent from or avoid by pressure limiting module after switching to the second operating mode to make due to suddenly touching on the brake
At overthrow accident, structure and control process are easy to realize.Service brake protection valve is installed on to the row of working truck
Between the service brake valve and checking cylinder of vehicle braking system, in operation when driving, service brake can be protected Vavle switching extremely
Second operating mode, the then hydraulic oil for carrying out bicycle brake valve enter checking cylinder after the decompression of pressure limiting module, and pressure limiting module changes
Brake pressure output characteristics is become, pressure output is made to become soft slow, caused by preventing or avoiding due to suddenly touching on the brake
Overthrow accident improves security performance when working truck belt carrying running.
The embodiment of the present invention also provides a kind of working truck, including service braking system, and service braking system includes driving
Brake valve, checking cylinder and service brake above-mentioned protect valve, service brake that the first connector of valve is protected to connect with service brake valve
It connects, the second connector of service brake protection valve is connect with checking cylinder.
The present invention changes control thought for service braking system, is not limited in driving process real-time with detection technique
Slide-out critical condition is monitored, and determines service brake according to an important factor for influencing working truck stability first
The operating mode of valve is protected, such as empty container piling crane, for progress such as spreader height, door frame angles of inclination
Judge, if with the risk tumbled, service brake protection Vavle switching is subjected to safe guarantor to the second operating mode
Shield.
Various embodiments of the present invention are specifically described below with reference to Fig. 1 to Fig. 5.
First embodiment
Fig. 1 is that the principle schematic of valve is protected in the service brake of first embodiment of the invention.
As shown in Figure 1, the service brake protection valve 100 of first embodiment has the first connector A, the second connector B simultaneously
Including handover module and pressure limiting module.Wherein the first connector A is for the service brake with the service braking system of working truck
Valve connects, and the second connector B with the checking cylinder of the service braking system for connecting.Wherein, handover module can control driving
Braking protection valve switches between the first operating mode and the second operating mode.In the first operating mode, the first connector A and
Two connector B are connected to by handover module.In the second operating mode, the first connector A and the second connector B pass through pressure limiting module
Connection.
As shown in Figure 1, the handover module of first embodiment includes reversal valve 110, reversal valve 110 includes the first hydraulic fluid port and the
Two hydraulic fluid ports simultaneously have the first operating position (the left working position in Fig. 1) and the second operating position (the right working position in Fig. 1), commutation
First hydraulic fluid port of valve 110 is connect with the first connector A, and the second hydraulic fluid port of reversal valve 110 is connect with the second connector B, wherein
Its first hydraulic fluid port of first operating position of reversal valve 110 is connected to the second hydraulic fluid port, and service brake protects valve 100 to be in the first work
Pattern.Since the first hydraulic fluid port is connected to the second hydraulic fluid port, by the first connector A Lai hydraulic oil through the first hydraulic fluid port and second oil
Mouth flows to the second connector B, to which the first connector A and the second connector B is connected to by reversal valve 110.In reversal valve 110
Its first hydraulic fluid port of second operating position and the second hydraulic fluid port disconnect, and service brake protection valve 100 is in the second operating mode.Second
Operating mode, since the first hydraulic fluid port and the second hydraulic fluid port disconnect, the hydraulic oil come from the first connector A can only pass through pressure limiting module stream
To the second connector B, therefore, it is connected to by pressure limiting module with the second connector B in second operating mode the first connector A.
As shown in Figure 1, in first embodiment specifically, reversal valve 110 is 2/2-way solenoid directional control valve.The setting makes pair
Service brake protects the operation of valve 100 quick, convenient.It is highly preferred that reversal valve 110 is normally opened solenoid directional control valve, that is, when powering off
Reversal valve 110 is in the first operating position, and when energization is in the second operating position.Reversal valve 110 is set as normally opened electromagnetic switch
Valve is conducive to make the service braking system of working truck to keep the first connector A and second in the case that reversal valve 110 is cold
Connector B connection, if when to protect valve 100 without any control to service brake, service braking system substantially not by
The influence of valve 100 is protected in service brake.
In first embodiment, handover module is arranged with pressure limiting wired in parallel.The setting makes the easy of service brake protection valve 100
In realization, maintenance that is easily controllable and protecting valve 100 convenient for service brake.
Wherein, pressure limiting module may include a pressure limiting submodule, can also include the different multiple pressure limitings of pressure limiting ability
Submodule.In the present embodiment, pressure limiting module only includes a pressure limiting submodule 120.
Pressure limiting submodule 120 includes voltage-limiting element, wherein the input end of voltage-limiting element is connect with the first connector A, pressure limiting
The outlet end of element is connect with the second connector B.
Voltage-limiting element can be throttling set or decompressor etc..In the first embodiment, voltage-limiting element is throttle valve
121。
In first embodiment, when reversal valve 110 switches to the second operating position, the first hydraulic fluid port of reversal valve 110 and
Two hydraulic fluid ports disconnect, and the protection valve 100 of service brake at this time switches to the second operating mode, and hydraulic oil will be reached from the first connector A
The input end of throttle valve 121, the outlet end after 121 pressure limiting of throttle valve again through throttle valve 121 and the second connector B outflow drivings
Braking protection valve 100.
Additionally preferably, pressure limiting submodule further includes the check valve being arranged in parallel with voltage-limiting element.As shown in Figure 1, first
In embodiment, pressure limiting submodule includes the check valve 122 being arranged in parallel with throttle valve 121, the input end of check valve 122 and second
Connector B connections, the outlet end of check valve 122 are connect with the first connector A.The feelings that the setting can end in reversal valve 110
Make the smooth oil return of hydraulic oil under condition, but does not interfere with the normal work of pressure limiting module.
Fig. 2 is that valve liquid under the first operating mode and the second operating mode is protected in the service brake of first embodiment of the invention
The brake pressure time history plot of pressure oil.In figure 3, abscissa represents the time, and ordinate represents the pressure of hydraulic oil
Power.First pressure curve G is represented and is protected valve 100 by service brake when service brake protection valve 100 is in the first operating mode
Hydraulic fluid pressure change curve afterwards, second pressure curve H are represented when service brake protection valve 100 is in the second operating mode and are passed through
Cross the hydraulic fluid pressure change curve after service brake protection valve 100.
Since reversal valve 110 ends in the second operation mode, hydraulic oil will all flow into throttle valve 121, in throttle valve
Under 121 restriction effect effect, pressurization by than directly by delaying when the first operating position of reversal valve 110, because
This, as shown in Fig. 2, second pressure curve H is lagged in time compared with first pressure curve G, to the second operating mode with
More soft it will delay compared to brake in the first operating mode, even if anxious step on the gas, it is possibility to have avoid or reduce to effect and tumble
Accident.And when service brake releases, hydraulic oil can run through 122 oil return of check valve, to ensure that service brake can be effective
It releases.
As it can be seen that in first embodiment, in the case where the pressure of the first connector A is certain, work in the second operation mode
The rate of pressure increase of the second connector B is less than the pressure increase of the second connector B when working in the first operation mode when making
Speed.
First embodiment also provides a kind of working truck.The working truck includes service braking system, service braking system
Valve 100 is protected including service brake valve, checking cylinder and service brake above-mentioned.The first connector A of valve 100 is protected in service brake
It is connect with service brake valve, the second connector B of service brake protection valve is connect with checking cylinder.The working truck for example can be
Empty container piling crane etc. lifts class lifting vehicle.
The working truck when driving, can control hydraulic oil according to the difference of applying working condition using reversal valve 110
Handover module or pressure limiting module are flowed through, the brake pressure of hydraulic oil can be changed when flowing through the throttle valve 121 of pressure limiting module
Output characteristics, overthrow accident caused by prevent or reduce due to bringing to a halt.
Preferably, service braking system includes that protection releases device, and protection, which releases device, can control service brake protection
Valve 100 switches to the first operating mode from the second operating mode, to the protection of satisfying compulsory commutation service brake protection valve 100
Function.
Fig. 3 is that driving for the working truck of valve and protection releasing device is protected in the service brake with first embodiment of the invention
Sail indoor partial structural diagram.
As shown in Figure 3, it is preferable that it includes that protection releases brake pedal 30 that protection, which releases device,.Specifically, service brake
System includes brake pedal 10 and protection releases pedal 30, and brake pedal 10 and protection release pedal 30 and may be contained within working truck
On cab floor 50 in front of driver seat, and brake pedal 10 is located at the right side of the center line X of driver seat, and protection releases
Pedal 30 is located at the left side of the center line X of driver seat.Protection, which releases pedal 30 and can control service brake, protects valve 100 from the
Two operating modes switch to the first operating mode.Service brake valve 20 is located at the bottom of cab floor 50.
As shown in figure 3, it is highly preferred that it further includes that protection valve releases control switch 40 that protection, which releases device, in the present embodiment.
Protection valve releases control switch 40 and is coupled with handover module, can control service brake and valve 100 is protected to switch from the second operating mode
To the first operating mode.Wherein, protection valve releases control switch 40 and is connect with protection releasing pedal 30, and it is logical that protection releases pedal 30
It crosses the control protection valve releasing control control service brake protection valve 100 of switch 40 and switches to the first Working mould from the second operating mode
Formula.
Under special operation condition, if you need to preferable braking effect, driver, which does not have with its micro-judgment working truck such as, to incline
Risk is turned over, then can release device (step on protection in the present embodiment and release pedal 30) by operation protection and protect service brake
Shield valve 100 switches to the second operating mode, and the safety protection function of valve 100 is protected with compulsory commutation service brake.It is forcing to solve
When safety protection function, working truck is because service brake protects the effect of valve 100 to tend towards stability state, therefore wind of tumbling
Danger can be effectively controlled.Moreover, the installation position that protection releases pedal 30 so that releasing service brake in the present embodiment protects
The operating process for protecting the safety protection function of valve 100 need to be operated by driver by left foot, be different from normal operating, therefore can keep away
Exempt to tumble caused by maloperation.
Illustrate the service brake of the working truck of first embodiment of the invention by taking empty container piling crane as an example below
Journey.
When carrying out the normally travel without load, reversal valve 110 must not be electric, and hydraulic oil (can pass through commutation by handover module
First operating position of valve 110) checking cylinder is directly acted on, module is limited at this time and is not worked, on service brake without influence.This
When hydraulic oil brake pressure by first pressure curve G variations as shown in Figure 2, brake pressure can reach rapidly maximum working pressure
Power ensures service brake safety when normally travel.
When carrying out carrying stacking operation, spreader position and door frame inclination angle are affected to whole vehicle stability.When detection is hung
Tool is in a high position, or grabs case door frame does not tilt when driving, then make reversal valve 110 it is electric be in the second operating position, hydraulic oil will
The throttle valve 121 for all flowing into pressure limiting module, due to the restriction effect of throttle valve 121, pressure foundation will be than without throttle valve
121 and while passing through reversal valve 110, delays, the brake pressure of hydraulic oil is by second pressure curve H variations as shown in Figure 2 at this time,
Brake will be more soft slow, be less prone to the overthrow accident because caused by bringing to a halt.
When service brake releases, hydraulic oil can run through 122 oil return of check valve, to ensure that service brake effectively solves
It removes.
It in certain special operation conditions, needs to have higher requirements to service brake, experienced driver can be by vehicle shape
The judgement of state releases pedal 30 using protection and the protection valve installed thereon releases control switch 40, compulsory commutation service brake
Protect valve 100 in reversal valve 110 electricity condition, make service brake protection valve 100 switch to the first work from the second operating mode
Operation mode works, to ensure there is preferable braking effect.During releasing, due to protecting valve by service brake
100 have carried out the protection of a period of time, the practical state that tended towards stability of working truck, therefore also reduce the risk tumbled.And
And due to being operated using left foot, avoid the maloperation of driver.
Protection, which releases device, in the present embodiment can also use other operation formats, such as hand push button etc..
Second embodiment
Fig. 4 is that the principle schematic of valve is protected in the service brake of second embodiment of the invention.
Service braking control valve and the first embodiment of second embodiment the difference is that, in second embodiment, limit
Press the voltage-limiting element not instead of throttling set of submodule, decompressor.
As shown in figure 4, the service braking control valve 200 of second embodiment has the first connector C and the second connector D,
First connector C with service brake valve for connecting, and the second connector D with checking cylinder for connecting.Service brake valve protection valve
200 include handover module and pressure limiting module.Handover module and the setting of pressure limiting wired in parallel.Handover module includes reversal valve 210.
Pressure limiting module only includes a pressure limiting submodule 220.The pressure limiting submodule include the voltage-limiting element that is arranged in parallel and
Check valve 222.
Voltage-limiting element is in particular pressure reducing valve 221 in a second embodiment.The input end of pressure reducing valve 221 and the first connector
C connections, the outlet end of pressure reducing valve 221 are connect with the second connector D.
The input end of check valve 222 is connect with the second connector D, and the outlet end of check valve 222 connects with the first connector C
It connects.
In second embodiment, due to the depressurization of pressure reducing valve 221, in the case where the pressure of the first connector C is certain,
The pressure of the second connector D is less than the second connector D when working in the first operation mode when working in the second operation mode
Pressure.To which for hydraulic oil not-go end die block, the pressure limiting module with pressure reducing valve 221 can equally change
The output characteristics for becoming the brake pressure of hydraulic oil makes brake become soft slow, inclines caused by prevent or reduce due to bringing to a halt
Turn over accident.
Other unaccounted contents can refer to the related content of first embodiment in second embodiment.
3rd embodiment
Fig. 5 is that the principle schematic of valve is protected in the service brake of third embodiment of the invention.
As shown in figure 5, the service brake protection valve 300 of 3rd embodiment has the first connector E, the second connector F simultaneously
Including handover module M1 and pressure limiting module M2.Wherein the first connector E is for the driving with the service braking system of working truck
Brake valve connects, and the second connector F with the checking cylinder of the service braking system for connecting.Wherein, handover module M1 can be controlled
Service brake protection valve 300 processed switches between the first operating mode and the second operating mode.Connect in the first operating mode, first
Interface E is connected to the second connector F by handover module M1, in the second operating mode, the first connector E and the second connector F
It is connected to by pressure limiting module M2.
As shown in figure 5, the handover module M1 of 3rd embodiment includes reversal valve 310, reversal valve 310 include the first hydraulic fluid port and
Second hydraulic fluid port simultaneously has the first operating position (the left working position in Fig. 5) and the second operating position (the right working position in Fig. 5), changes
It is connect to the first hydraulic fluid port of valve 310 with the first connector E, the second hydraulic fluid port of reversal valve 310 is connect with the second connector F.Wherein,
In the first operating position of reversal valve 310, its first hydraulic fluid port is connected to the second hydraulic fluid port, and service brake protection valve 300 is in the first work
Operation mode.Since the first hydraulic fluid port is connected to the second hydraulic fluid port, by the first connector E Lai hydraulic oil through the first hydraulic fluid port and the second hydraulic fluid port
The second connector F is flowed to, to which the first connector E and the second connector F is connected to by reversal valve 310.The of reversal valve 310
Its first hydraulic fluid port of two operating positions and the second hydraulic fluid port disconnect, and service brake protection valve 300 is in the second operating mode.In the second work
Operation mode, since the first hydraulic fluid port and the second hydraulic fluid port disconnect, the hydraulic oil come from the first connector E can only be flowed by pressure limiting module M2
To the second connector F, therefore, it is connected to by pressure limiting module M2 with the second connector F in second operating mode the first connector E.
In 3rd embodiment specifically, reversal valve 310 is the normally opened solenoid directional control valve of 2/2-way.
In 3rd embodiment, handover module M1 is arranged in parallel with pressure limiting module M2.The setting protects valve convenient for service brake
100 maintenance.
Wherein, pressure limiting module M2 includes the different multiple pressure limiting submodules of pressure limiting ability.As shown in figure 5, in the present embodiment
In, pressure limiting module M2 includes three pressure limiting submodules, respectively the first pressure limiting submodule 320, the second pressure limiting submodule 340 and the
Three pressure limiting submodules 360.
As shown in figure 5, each pressure limiting submodule includes voltage-limiting element, wherein the input end of voltage-limiting element and the first connector E
Connection, the outlet end of voltage-limiting element is connect with the second connector F.In the third embodiment, voltage-limiting element is pressure reducing valve.In addition excellent
Selection of land, each pressure limiting submodule further include the check valve being arranged in parallel with voltage-limiting element.
In addition, in 3rd embodiment, it further includes selecting module M3 that valve 300 is protected in service brake, in the second operating mode, choosing
Module M3 is selected for selecting a pressure limiting submodule in multiple pressure limiting submodules to connect by the selected pressure limiting submodule
Logical first connector E and the second connector F.
The way of realization of selecting module M3 can there are many.Preferably, selecting module M3 includes multiple selection submodules, often
A selection submodule is connected at least one corresponding pressure limiting submodule.It is further preferred that each selection submodule is connected to
Between corresponding pressure limiting submodule and the first connector E.
It is each that submodule and a pressure limiting submodule is selected to be connected in series to form a limit correspondingly in the present embodiment
Press branch, each pressure limiting branch circuit parallel connection.
As shown in figure 5, selecting module includes that first choice submodule, the second selection submodule and third selection submodule are total
Three selection submodules.First choice submodule includes the first reversal valve 330, the first reversal valve 330 and the first pressure limiting submodule
320 series connection form the first pressure limiting branch；Second selection submodule includes the second reversal valve 350, the second reversal valve 350 and second limit
The series connection of submodule 340 is pressed to form the second pressure limiting branch；Third selects submodule third reversal valve 370, third reversal valve 370 and the
The series connection of three pressure limiting submodules 360 forms third pressure limiting branch.First pressure limiting branch, the second pressure limiting branch and third pressure limiting branch are simultaneously
Connection.
As shown in figure 5, the first pressure limiting submodule 320 includes the first pressure reducing valve 321 and the first check valve being arranged in parallel
322, the input end of the first pressure reducing valve 321 is connect by the first reversal valve 330 with the first connector E, and the first pressure reducing valve 321 goes out
Mouth end is connect with the second connector F, and the input end of the first check valve 322 is connect with the second connector F, the first check valve 322
Outlet end is connect with the second connector E by the first reversal valve 330.Second pressure limiting submodule 340 includes second be arranged in parallel
The input end of pressure reducing valve 341 and the second check valve 342, the second pressure reducing valve 341 passes through the second reversal valve 350 and the first connector E
Connection, the outlet end of the second pressure reducing valve 341 are connect with the second connector F, the input end and the second connector of the second check valve 342
F connections, the outlet end of the second check valve 342 are connect with the first connector E by the second reversal valve 350.Third pressure limiting submodule
360 include that the third pressure reducing valve 361 being arranged in parallel and third check valve 362, the input end of third pressure reducing valve 361 are changed by third
It is connect to valve 370 with the first connector E, the outlet end of third pressure reducing valve 361 is connect with the second connector F, third check valve 362
Input end connect with the second connector F, the outlet end of third check valve 362 and the first connector E pass through third reversal valve 370
Connection.
In 3rd embodiment, in the second operation mode, when the first reversal valve in each selection submodule of selecting module M3
When 330 open, the second reversal valve 350 ends, third reversal valve 370 ends, the hydraulic oil from the first connector E passes through first
It flow to the second connector F after 321 pressure limiting of pressure reducing valve, and 322 oil return of the first check valve can be passed through；It is each as selecting module M3
When the first reversal valve 330 cut-off in submodule, the second reversal valve 350 opening, third reversal valve 370 being selected to end, first is come from
The hydraulic oil of connector E can pass through the second check valve by flowing to the second connector F after 341 pressure limiting of the second pressure reducing valve
342 oil returns；When the cut-off of the first reversal valve 330, the cut-off of the second reversal valve 350, third in each selection submodule of selecting module M3
When reversal valve 370 is opened, the hydraulic oil from the first connector E after 361 pressure limiting of third pressure reducing valve by flowing to the second connector
F, and 362 oil return of third check valve can be passed through.
Wherein, each pressure reducing valve can be constant pressure pressure-reducing valve, uniform-pressure-drop valve or proportional pressure reducing valve.In the present embodiment,
One pressure reducing valve 321, the second pressure reducing valve 341 and third pressure reducing valve 361 are constant pressure pressure-reducing valve, wherein the first pressure reducing valve 321 goes out
Mouthful end pressure is P1, and the outlet pressures of the second pressure reducing valve 341 are P2, and the outlet pressures of third pressure reducing valve 341 are P3, P1,
P2 and P3 are different, then the pressure limiting of the first pressure limiting submodule 320, third pressure limiting submodule 340 and third pressure limiting submodule 360
Ability is different.When working truck works in the second operation mode, it can be passed through according to specific working condition and select mould
Block M3 selects most suitable pressure limiting submodule to carry out pressure limiting.
Therefore, in the present embodiment, when reversal valve 310 is acted to the second operating position, make the first hydraulic fluid port of reversal valve 310
It is disconnected with the second hydraulic fluid port, the protection valve 300 of service brake at this time switches to the second operating mode, and hydraulic oil will be from the first connector E
It is passed through again after a chosen pressure limiting submodule pressure limiting of pressure limiting module M2 again after reaching selecting module M3, chosen module M3
Valve 300 is protected in second connector F outflow service brakes.
By taking empty container piling crane as an example, it can be directed to different critical conditions of tumbling, corresponding pressure reducing valve is set and subtract
Pressure pressure is subdivided into high, medium and low third gear to suspender present position, for example, can set P1 is less than P3 less than P2, P2.Work as suspender
Selecting module M3 selects the work of the first reversal valve 321 when in a high position, limits maximum brake pressure as P1, prevents from bringing to a halt；When
Selecting module M3 selects the work of the second reversal valve 341 when suspender is in middle position, limits maximum brake pressure as P2；When suspender is in
Selecting module M3 selects third reversal valve 361 to work when low level, limits maximum brake pressure as P3.Therefore, 3rd embodiment
Service brake protects valve 300 for first embodiment and second embodiment, more targeted can be protected, and reduces
To the sacrifice of brake efficiency, ensure traffic safety.
Other unaccounted parts can refer to the related content of first embodiment and second embodiment in 3rd embodiment.
From the above description, it can be seen that the above various embodiments of the present invention has the following advantages that：
1, service brake protection valve can change the output spy of the brake pressure of hydraulic oil in working truck belt carrying running
Property, it is allowed to become more soft slow, reduces and cause the risk tumbled due to suddenly touching on the brake, improve driving safety, increase driver
The comfort of operation, and under normally travel working condition, braking effect is substantially unaffected.
2, cost is relatively low, it is easy to accomplish.
3, under special operation condition, if you need to preferable braking effect, driver can compulsory commutation service brake protection valve guarantor
Protective function；Further, releasing process is different from normal operating, and vehicle has tended towards stability state during the releasing, because
Although this compulsory commutation defencive function, is also avoided that and tumbles because bringing to a halt.
Finally it should be noted that：The above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof；To the greatest extent
The present invention is described in detail with reference to preferred embodiments for pipe, those of ordinary skills in the art should understand that：Still
It can modify to the specific implementation mode of the present invention or equivalent replacement is carried out to some technical characteristics；Without departing from this hair
The spirit of bright technical solution should all cover within the scope of the technical scheme claimed by the invention.
Claims (16)
1. valve is protected in a kind of service brake, which is characterized in that the service brake protection valve has for connecting with service brake valve
The first connector connect and the second connector for being connect with checking cylinder, service brake protection valve include handover module and
Pressure limiting module, the handover module for control service brake protection valve the first operating mode and the second operating mode it
Between switch, in first operating mode, first connector is connected to by the handover module with second connector,
In second operating mode, first connector is connected to second connector by the pressure limiting module.
2. valve is protected in service brake according to claim 1, which is characterized in that the handover module includes reversal valve, institute
It states reversal valve to include the first hydraulic fluid port and the second hydraulic fluid port and there is the first operating position and the second operating position, the of the reversal valve
One hydraulic fluid port is connect with first connector, and second hydraulic fluid port is connect with second connector, wherein in the reversal valve
Its first hydraulic fluid port of the first operating position be connected to the second hydraulic fluid port, service brake protection valve is in first Working mould
Formula；In the second operating position of the reversal valve, its first hydraulic fluid port and the second hydraulic fluid port disconnect, and the service brake protection valve is in
Second operating mode.
3. valve is protected in service brake according to claim 1, which is characterized in that certain in the pressure of first connector
In the case of, when working under second operating mode described in the second connector rate of pressure increase be less than described first
The rate of pressure increase of second connector described in when working under operating mode；Or it is certain in the pressure of first connector
In the case of, when working under second operating mode described in the second connector pressure be less than in this first operative mode
The pressure of second connector described in when work.
4. valve is protected in service brake according to claim 1, which is characterized in that the handover module and the pressure limiting module
It is in parallel.
5. valve is protected in service brake according to any one of claim 1 to 4, which is characterized in that the pressure limiting module packet
Include a pressure limiting submodule or the different multiple pressure limiting submodules of pressure limiting ability.
6. valve is protected in service brake according to claim 5, which is characterized in that the pressure limiting module includes the multiple limit
Submodule is pressed, the service brake protection valve further includes selecting module, and in second operating mode, the selecting module is used for
A pressure limiting submodule is selected in the multiple pressure limiting submodule to be connected to described the by the selected pressure limiting submodule
One connector and second connector.
7. valve is protected in service brake according to claim 6, which is characterized in that the selecting module includes multiple selection
Module, each selection submodule are connected at least one corresponding pressure limiting submodule.
8. valve is protected in service brake according to claim 7, which is characterized in that each selection submodule and an institute
It states pressure limiting submodule and is connected in series to form a pressure limiting branch, each pressure limiting branch circuit parallel connection correspondingly.
9. valve is protected in service brake according to claim 5, which is characterized in that the pressure limiting submodule includes pressure limiting member
Part, wherein the input end of the voltage-limiting element is connect with first connector, the outlet end of the voltage-limiting element and described the
Two connectors connect.
10. valve is protected in service brake according to claim 9, which is characterized in that the voltage-limiting element includes throttling set
Or decompressor.
11. valve is protected in service brake according to claim 9, which is characterized in that the pressure limiting submodule further includes and institute
State the check valve that voltage-limiting element is arranged in parallel, wherein the input end of the check valve is connect with second connector, the list
It is connect to the outlet end of valve with first connector.
12. a kind of working truck, including service braking system, the service braking system includes service brake valve and checking cylinder,
It is characterized in that, the service braking system further includes service brake protection according to any one of claim 1 to 11
First connector of valve, service brake protection valve is connect with the service brake valve, and the of valve is protected in the service brake
Two connectors are connect with the checking cylinder.
13. working truck according to claim 12, which is characterized in that the service braking system further includes that protection releases
Device, the protection release device and protect valve to switch to described the from second operating mode for controlling the service brake
One operating mode.
14. working truck according to claim 13, which is characterized in that it includes that protection releasing is stepped on that the protection, which releases device,
Plate, the protection release pedal and are set in front of the driver seat of the working truck, and the protection releases pedal positioned at described
The left side of the center line of driver seat, wherein the protection, which releases pedal and can control the service brake, protects valve from described
Second operating mode switches to first operating mode.
15. working truck according to claim 14, which is characterized in that the protection releases device and further includes and the guarantor
The protection valve that shield releases pedal connection releases control switch, and the protection valve releases control switch and coupled with the handover module,
The protection, which releases pedal and releases control switch by controlling the protection valve, controls the service brake protection valve from described the
Two operating modes switch to first operating mode.
16. according to working truck described in any one of claim 12 to 15, which is characterized in that the working truck is packaging
Case empty container stacking machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510901736.0A CN105416265B (en) | 2015-12-09 | 2015-12-09 | Valve and working truck are protected in service brake |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510901736.0A CN105416265B (en) | 2015-12-09 | 2015-12-09 | Valve and working truck are protected in service brake |
Publications (2)
| Publication Number | Publication Date |
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| CN105416265A CN105416265A (en) | 2016-03-23 |
| CN105416265B true CN105416265B (en) | 2018-10-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510901736.0A Active CN105416265B (en) | 2015-12-09 | 2015-12-09 | Valve and working truck are protected in service brake |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106218618A (en) * | 2016-09-07 | 2016-12-14 | 王明中 | A kind of automobile oil pressure resistance device |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3551221B2 (en) * | 1996-09-10 | 2004-08-04 | 日清紡績株式会社 | Hydraulic pressure control valve device in hydraulic brake device |
| JP3458695B2 (en) * | 1997-03-14 | 2003-10-20 | トヨタ自動車株式会社 | Vehicle hydraulic brake system |
| CN1265994A (en) * | 1999-02-02 | 2000-09-13 | 马洪沛 | Method for vehicle running hydraulic braking system |
| CN2892814Y (en) * | 2006-04-27 | 2007-04-25 | 中国国际海运集装箱(集团)股份有限公司 | Stacker hydraulic system |
| EA019456B1 (en) * | 2010-09-20 | 2014-03-31 | Кнорр-Бремзе Зюстеме Фюр Шиненфарцойге Гмбх | Control valve comprising switching means for switching between characteristic curves of brake pressure |
| CN201941752U (en) * | 2010-11-03 | 2011-08-24 | 韩硬金 | Liquid breaking control system |
| CN203187367U (en) * | 2013-02-28 | 2013-09-11 | 奇瑞重工股份有限公司 | Lifting hydraulic system of container empty container stacking machine |
| CN205256322U (en) * | 2015-12-09 | 2016-05-25 | 徐州重型机械有限公司 | Service brake protective valve and operation vehicle |
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| CN105416265A (en) | 2016-03-23 |
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