CN105416265A - Driving braking protection valve and work vehicle - Google Patents
Driving braking protection valve and work vehicle Download PDFInfo
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- CN105416265A CN105416265A CN201510901736.0A CN201510901736A CN105416265A CN 105416265 A CN105416265 A CN 105416265A CN 201510901736 A CN201510901736 A CN 201510901736A CN 105416265 A CN105416265 A CN 105416265A
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- communication port
- service brake
- 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)
- Braking Systems And Boosters (AREA)
- Regulating Braking Force (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
Abstract
The invention discloses a driving braking protection valve and a work vehicle. The driving braking protection valve is provided with a first connecting opening used for being connected with a driving braking valve, and a second connecting opening used for being connected with a braking cylinder. The driving braking protection valve comprises a switching module and a pressure limiting module. The switching module is used for controlling the driving braking protection valve to be switched between a first work mode and a second work mode. In the first work mode, the first connecting opening is communicated with the second connecting opening through the switching module; and in the second work module, the first connecting opening is communicated with the second connecting opening through the pressure limiting module. According to the driving braking protection valve, the driving braking protection valve is controlled by the switching module to protect a driving braking system or not to protect the driving braking system. The driving braking protection valve switched to the first work mode barey influences the functions of the driving braking system, and the driving braking protection valve switched to the second work mode can prevent overthrow accidents caused by sudden braking through the pressure limiting module. The structure and the control process of the driving braking protection valve are easy to achieve.
Description
Technical field
The present invention relates to vehicular field, particularly a kind of service brake protective valve and working truck.
Background technology
The working truck that can carry weight walking is higher to stability requirement, carries in the process travelled may cause overthrow accident at band.
For empty container piling crane, it is applied to port and pier, freight container can rise and rise to tens meters by its special portal-framed structure, therefore higher to its stability requirement, and be usually in high-frequency operating condition due to it,, so may overthrow accident be there is when in use especially band carries traveling in easy generation maloperation.Such as, when suspender is in a high position in the process of moving, if it is too urgent to brake, easily there is overthrow accident.
In prior art, the anti-tipping safety method of empty container piling crane is Set scale reducing valve on brake fluid line.In empty container piling crane driving process, by detecting the information such as car load moving velocity, box weight, door frame angle of inclination, Forklift box height, maximum drag pressure requirements under control system real-time judge car load stability condition, control the proportional pressure-reducing valve that brake fluid line installs additional, thus control the maximum brake pressure of brake system, form a stable brake closed loop control system.As brake pressure reaches the maximum pressure of system stability condition, control system sends indicative sound and light alarm immediately, and telltale display dangerous information, carries out indicative warning to operator, otherwise disappearance automatically of reporting to the police.As control system judges that brake pressure is excessive, and have the danger of tumbling, then control ratio reducing valve reduces brake-pressure, and empty container piling crane reduction of speed is slided, and system prompt is reported to the police, and records precarious position.
Realizing in process of the present invention, designer of the present invention finds, above prior art has following weak point:
1, realize difficulty: prior art is comparatively difficult for the detection of key parameter, tumble model and result of calculation are difficult to ensure consistent.
2, cost is high: need increase proportional pressure-reducing valve and correlation detection element in brake circuits, cost is higher.
Summary of the invention
The object of the present invention is to provide a kind of service brake protective valve and working truck, be intended to propose a kind of working truck protected mode being easy to realize to avoid or to reduce because of the too urgent overthrow accident caused that brakes.
First aspect present invention provides a kind of service brake protective valve, described service brake protective valve has the first communication port for being connected with service brake valve and the second communication port for being connected with brake cylinder, described service brake protective valve comprises handover module and pressure limiting module, described handover module switches between the first mode of operation and the second mode of operation for controlling described service brake protective valve, at described first mode of operation, described first communication port is communicated with described second communication port by described handover module, at described second mode of operation, described first communication port is communicated with by described pressure limiting module with described second communication port.
Further, described handover module comprises change-over valve, described change-over valve comprises the first hydraulic fluid port and the second hydraulic fluid port and has the first control position and the second control position, first hydraulic fluid port of described change-over valve is connected with described first communication port, described second hydraulic fluid port is connected with described second communication port, wherein, be communicated with the second hydraulic fluid port at its first hydraulic fluid port of the first control position of described change-over valve, described service brake protective valve is in described first mode of operation; Disconnect at its first hydraulic fluid port of the second control position of described change-over valve and the second hydraulic fluid port, described service brake protective valve is in described second mode of operation.
Further, when the pressure of described first communication port is certain, described in when working under described second mode of operation, the rate of pressure increase of the second communication port is less than the rate of pressure increase of the second communication port described in when working in this first operative mode; Or when the pressure of described first communication port is certain, described in when working under described second mode of operation, the pressure of the second communication port is less than the pressure of the second communication port described in when working in this first operative mode.
Further, described handover module and described pressure limiting wired in parallel.
Further, described pressure limiting module comprises a pressure limiting submodule or the different multiple pressure limiting submodules of pressure limiting ability.
Further; described pressure limiting module comprises described multiple pressure limiting submodule; described service brake protective valve also comprises selection module; at described second mode of operation, described selection module is used in described multiple pressure limiting submodule, select a pressure limiting submodule to be communicated with described first communication port and described second communication port by this selected pressure limiting submodule.
Further, described selection module comprises multiple chooser module, the described pressure limiting submodule connection that each described chooser module is corresponding with at least one.
Further, each described chooser module and a described pressure limiting submodule are connected in series formation pressure limiting branch road, each described pressure limiting branch circuit parallel connection correspondingly.
Further, described pressure limiting submodule comprises voltage-limiting element, and wherein, the entrance point of described voltage-limiting element is connected with described first communication port, and the exit end of described voltage-limiting element is connected with described second communication port.
Further, described voltage-limiting element comprises throttling device or pressure purger.
Further, described pressure limiting submodule also comprises the check valve be arranged in parallel with described voltage-limiting element, and wherein, the entrance point of described check valve is connected with described second communication port, and the exit end of described check valve is connected with described first communication port.
Second aspect present invention provides a kind of working truck; comprise service braking system; described service braking system comprises service brake valve and brake cylinder; wherein; described service braking system also comprises the service brake protective valve according to any one of first aspect present invention; first communication port of described service brake protective valve is connected with described service brake valve, and the second communication port of described service brake protective valve is connected with described brake cylinder.
Further, described service braking system also comprises protection decontrol, and described protection decontrol switches to described first mode of operation for controlling described service brake protective valve from described second mode of operation.
Further; described protection decontrol comprises protection and removes pedal; the driver seat front that pedal is arranged at described working truck is removed in described protection; the left side that pedal is positioned at the line of centers of described driver seat is removed in described protection; wherein, described protection releasing pedal can control described service brake protective valve and switch to described first mode of operation from described second mode of operation.
Further; described protection decontrol also comprises to be removed the protective valve that pedal is connected remove master cock with described protection; described protective valve is removed master cock and is coupled with described handover module, and described protection releasing pedal controls described service brake protective valve by control described protective valve releasing master cock and switches to described first mode of operation from described second mode of operation.
Further, described working truck is empty container piling crane.
Based on service brake protective valve provided by the invention and working truck; service brake protective valve comprises handover module and pressure limiting module; handover module controls service brake protective valve and switches between the first mode of operation and the second mode of operation; at the first mode of operation; first communication port is communicated with by service brake protective valve with the second communication port; at the second mode of operation, the first communication port is communicated with by pressure limiting module with the second communication port.This service brake protective valve devises two independently modules; control service brake protective valve by handover module whether to protect service braking system; after switching to the first mode of operation; service brake protective valve on the function of service braking system substantially without impact; after switching to the second mode of operation, prevent or avoid the overthrow accident that causes because anxious touching on the brake by pressure limiting module, its structure and control process are all easy to realize.This service brake protective valve is installed between the service brake valve of the service braking system of working truck and brake cylinder; when travelling in operation; service brake protective valve can be switched to the second mode of operation; the hydraulic oil then carrying out bicycle brake valve enters brake cylinder after the decompression of pressure limiting module; pressure limiting module changes brake-pressure output characteristic; Output pressure is made to become soft slow; thus can prevent or avoid the overthrow accident that causes because anxious touching on the brake, improve safety performance when working truck band carries traveling.
By referring to the detailed description of accompanying drawing to exemplary embodiment of the present invention, further feature of the present invention and advantage thereof will become clear.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the principle schematic of the service brake protective valve of first embodiment of the invention.
Fig. 2 is the brake-pressure time history plot of service brake protective valve hydraulic oil under the first mode of operation and the second mode of operation of first embodiment of the invention.
Fig. 3 has local structure schematic diagram in the service brake protective valve of first embodiment of the invention and the operator's compartment of the working truck of protection decontrol.
Fig. 4 is the principle schematic of the service brake protective valve of second embodiment of the invention.
Fig. 5 is the principle schematic of the service brake protective valve of third embodiment of the invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Illustrative to the description only actually of at least one exemplary embodiment below, never as any restriction to the present invention and application or use.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Unless specifically stated otherwise, otherwise positioned opposite, the numerical expression of the parts of setting forth in these embodiments and step and numerical value do not limit the scope of the invention.Meanwhile, it should be understood that for convenience of description, the size of the various piece shown in accompanying drawing is not draw according to the proportionate relationship of reality.May not discuss in detail for the known technology of person of ordinary skill in the relevant, method and apparatus, but in the appropriate case, described technology, method and apparatus should be regarded as a part of authorizing specification sheets.In all examples with discussing shown here, any occurrence should be construed as merely exemplary, instead of as restriction.Therefore, other example of exemplary embodiment can have different values.It should be noted that: represent similar terms in similar label and letter accompanying drawing below, therefore, once be defined in an a certain Xiang Yi accompanying drawing, then do not need to be further discussed it in accompanying drawing subsequently.
For convenience of description, here can usage space relative terms, as " ... on ", " in ... top ", " at ... upper surface ", " above " etc., be used for the spatial relation described as a device shown in the figure or feature and other devices or feature.Should be understood that, space relative terms is intended to comprise the different azimuth in use or operation except the described in the drawings orientation of device.Such as, " in other devices or structure below " or " under other devices or structure " will be positioned as after if the device in accompanying drawing is squeezed, being then described as the device of " above other devices or structure " or " on other devices or structure ".Thus, exemplary term " in ... top " can comprise " in ... top " and " in ... below " two kinds of orientation.This device also can other different modes location (90-degree rotation or be in other orientation), and relatively describe space used here and make respective explanations.
In the following description, alleged " front " refers to the side at working truck headstock place; " afterwards " refers to the side relative with " front ", and " left side " and " right side " refers to the left and right directions formed when front.
As shown in Figure 1, Figure 4 and Figure 5; the service brake protective valve of the embodiment of the present invention has the first communication port for being connected with service brake valve and the second communication port for being connected with brake cylinder; service brake protective valve comprises handover module and pressure limiting module; handover module switches between the first mode of operation and the second mode of operation for controlling service brake protective valve; at the first mode of operation; first communication port is communicated with by handover module with the second communication port; at the second mode of operation, the first communication port is communicated with by pressure limiting module with the second communication port.
This service brake protective valve devises two independently modules; control service brake protective valve by handover module whether to protect service braking system; after switching to the first mode of operation; service brake protective valve on the function of service braking system substantially without impact; after switching to the second mode of operation, prevent or avoid the overthrow accident that causes because anxious touching on the brake by pressure limiting module, its structure and control process are all easy to realize.This service brake protective valve is installed between the service brake valve of the service braking system of working truck and brake cylinder; when travelling in operation; service brake protective valve can be switched to the second mode of operation; the hydraulic oil then carrying out bicycle brake valve enters brake cylinder after the decompression of pressure limiting module; pressure limiting module changes brake-pressure output characteristic; Output pressure is made to become soft slow; thus can prevent or avoid the overthrow accident that causes because anxious touching on the brake, improve safety performance when working truck band carries traveling.
The embodiment of the present invention also provides a kind of working truck; comprise service braking system; service braking system comprises service brake valve, brake cylinder and aforesaid service brake protective valve; first communication port of service brake protective valve is connected with service brake valve, and the second communication port of service brake protective valve is connected with brake cylinder.
The present invention is directed to service braking system and change control thought; do not limit to and use detection technique to monitor slide-out critical conditions in real time in the process of moving; and first according to the mode of operation of key factor determination service brake protective valve affecting working truck stability; such as empty container piling crane; judge for spreader height, door frame angle of inclination etc.; if have the risk of tumbling, then service brake protective valve switched to the second mode of operation and carry out safety guard-safeguard.
Below with reference to Fig. 1 to Fig. 5, various embodiments of the present invention are specifically described.
First embodiment
Fig. 1 is the principle schematic of the service brake protective valve of first embodiment of the invention.
As shown in Figure 1, the service brake protective valve 100 of the first embodiment has the first communication port A, the second communication port B and comprises handover module and pressure limiting module.Wherein the first communication port A is used for being connected with the service brake valve of the service braking system of working truck, and the second communication port B is used for being connected with the brake cylinder of this service braking system.Wherein, handover module can control service brake protective valve and switches between the first mode of operation and the second mode of operation.At the first mode of operation, the first communication port A is communicated with by handover module with the second communication port B.At the second mode of operation, the first communication port A is communicated with by pressure limiting module with the second communication port B.
As shown in Figure 1; the handover module of the first embodiment comprises change-over valve 110; change-over valve 110 comprises the first hydraulic fluid port and the second hydraulic fluid port and has the first control position (the left working position in Fig. 1) and the second control position (the right working position in Fig. 1); first hydraulic fluid port of change-over valve 110 is connected with the first communication port A; second hydraulic fluid port of change-over valve 110 is connected with the second communication port B; wherein; be communicated with the second hydraulic fluid port at its first hydraulic fluid port of the first control position of change-over valve 110, service brake protective valve 100 is in the first mode of operation.Because the first hydraulic fluid port is communicated with the second hydraulic fluid port, the hydraulic oil therefore come by the first communication port A flows to the second communication port B through the first hydraulic fluid port and the second hydraulic fluid port, thus the first communication port A is communicated with by change-over valve 110 with the second communication port B.Disconnect at its first hydraulic fluid port of the second control position of change-over valve 110 and the second hydraulic fluid port, service brake protective valve 100 is in the second mode of operation.At the second mode of operation, because the first hydraulic fluid port and the second hydraulic fluid port disconnect, the hydraulic oil come from the first communication port A can only flow to the second communication port B by pressure limiting module, therefore, is communicated with the second communication port B at the second mode of operation first communication port A by pressure limiting module.
As shown in Figure 1, in the first embodiment particularly, change-over valve 110 is 2/2-way solenoid directional control valve.This setting makes the operation of service brake protective valve 100 quick, convenient.More preferably, change-over valve 110 is for often to drive solenoid directional control valve, and namely during power-off, change-over valve 110 is in the first control position, is in the second control position during energising.Change-over valve 110 is set to often to open solenoid directional control valve and is beneficial to and makes the service braking system of working truck in the cold situation of change-over valve 110, keep the first communication port A to be communicated with the second communication port B; as long as thus when not carrying out any control to service brake protective valve 100, service braking system is not substantially by the impact of service brake protective valve 100.
In first embodiment, handover module and pressure limiting wired in parallel are arranged.This setting make service brake protective valve 100 be easy to realize, be easy to control and be convenient to the maintenance of service brake protective valve 100.
Wherein, pressure limiting module can comprise a pressure limiting submodule, also can comprise multiple pressure limiting submodules that pressure limiting ability is different.In the present embodiment, pressure limiting module only comprises a pressure limiting submodule 120.
Pressure limiting submodule 120 comprises voltage-limiting element, and wherein, the entrance point of voltage-limiting element is connected with the first communication port A, and the exit end of voltage-limiting element is connected with the second communication port B.
Voltage-limiting element can be throttling device or pressure purger etc.In a first embodiment, voltage-limiting element is flow regulating valve 121.
In first embodiment; when change-over valve 110 switches to the second control position; first hydraulic fluid port of change-over valve 110 and the second hydraulic fluid port disconnect; now service brake protective valve 100 switches to the second mode of operation, and hydraulic oil will arrive the entrance point of flow regulating valve 121, exit end and the second communication port B outflow service brake protective valve 100 again through flow regulating valve 121 after flow regulating valve 121 pressure limiting from the first communication port A.
In addition preferably, pressure limiting submodule also comprises the check valve be arranged in parallel with voltage-limiting element.As shown in Figure 1, in the first embodiment, pressure limiting submodule comprises the check valve 122 be arranged in parallel with flow regulating valve 121, and the entrance point of check valve 122 is connected with the second communication port B, and the exit end of check valve 122 is connected with the first communication port A.This arranges and can make the smooth oil return of hydraulic oil when change-over valve 110 ends, but can not affect the normal work of pressure limiting module.
Fig. 2 is the brake-pressure time history plot of service brake protective valve hydraulic oil under the first mode of operation and the second mode of operation of first embodiment of the invention.In figure 3, abscissa represents the time, and ordinate represents the pressure of hydraulic oil.First pressure curve G represents hydraulic fluid pressure change curve when service brake protective valve 100 is in the first mode of operation after service brake protective valve 100, and the second pressure curve H represents hydraulic fluid pressure change curve when service brake protective valve 100 is in the second mode of operation after service brake protective valve 100.
Because change-over valve 110 ends in the second operation mode, hydraulic oil will all flow into flow regulating valve 121, under the restriction effect effect of flow regulating valve 121, pressurization delays than during direct the first control position by change-over valve 110, therefore, as shown in Figure 2, second pressure curve H is delayed in time compared with the first pressure curve G, thus the second mode of operation is more soft slow with the general that brakes compared with the first mode of operation, even if anxious step on the accelerator, also effectively can avoid or reduce generation overthrow accident.And when service brake is removed, hydraulic oil can pass through rapidly check valve 122 oil return, thus ensure that service brake can efficient solution remove.
Visible, in the first embodiment, when the pressure of the first communication port A is certain, when working in the second operation mode, the rate of pressure increase of the second communication port B is less than the rate of pressure increase of the second communication port B when working in a first operation mode.
First embodiment also provides a kind of working truck.This working truck comprises service braking system, and service braking system comprises service brake valve, brake cylinder and aforesaid service brake protective valve 100.First communication port A of service brake protective valve 100 is connected with service brake valve, and the second communication port B of service brake protective valve is connected with brake cylinder.This working truck can be such as the lifting class lifting vehicles such as empty container piling crane.
This working truck when driving, can according to the difference of applying working condition, change-over valve 110 hydraulic control oil is utilized to flow through handover module or pressure limiting module, the output characteristic of the brake-pressure of hydraulic oil can be changed when flowing through the flow regulating valve 121 of pressure limiting module, thus prevent or reduce the overthrow accident caused because of sudden stop.
Preferably, service braking system comprises protection decontrol, and protection decontrol can control service brake protective valve 100 and switch to the first mode of operation from the second mode of operation, thus the defencive function of satisfying compulsory commutation service brake protective valve 100.
Fig. 3 has local structure schematic diagram in the service brake protective valve of first embodiment of the invention and the operator's compartment of the working truck of protection decontrol.
As shown in Figure 3, preferably, decontrol is protected to comprise protection brake off pedal 30.Particularly; service braking system comprises brake pedal 10 and pedal 30 is removed in protection; brake pedal 10 and protection are removed pedal 30 and are all arranged on the cab floor 50 in the driver seat front of working truck; and brake pedal 10 is positioned at the right side of the line of centers X of driver seat, the left side that pedal 30 is positioned at the line of centers X of driver seat is removed in protection.Protection releasing pedal 30 can control service brake protective valve 100 and switch to the first mode of operation from the second mode of operation.Service brake valve 20 is positioned at the bottom of cab floor 50.
As shown in Figure 3, in the present embodiment more preferably, protect decontrol also to comprise protective valve and remove master cock 40.Protective valve is removed master cock 40 and is coupled with handover module, can control service brake protective valve 100 and switch to the first mode of operation from the second mode of operation.Wherein, protective valve releasing master cock 40 is removed pedal 30 with protection and is connected, and protection releasing pedal 30 controls service brake protective valve 100 by Control protection valve releasing master cock 40 and switches to the first mode of operation from the second mode of operation.
Under special operation condition; as needed good braking effect; chaufeur is not as possessed risk of tumbling with its micro-judgment working truck; then service brake protective valve 100 is switched to the second mode of operation, with the safety protection function of compulsory commutation service brake protective valve 100 by operation protection decontrol (step on protection in the present embodiment and remove pedal 30).When compulsory commutation safety protection function, working truck is because the effect of service brake protective valve 100 tends towards stability state, and risk of therefore tumbling can be effectively controlled.And the setting position that pedal 30 is removed in protection makes the operating process of the safety protection function removing service brake protective valve 100 in the present embodiment need be operated by left foot by chaufeur, and be different from normal running, that maloperation therefore can be avoided to cause tumbles.
The service braking operation of the working truck of first embodiment of the invention is described for empty container piling crane below.
During normal travelings not with carrying, change-over valve 110 must not be electric, and hydraulic oil can be passed through handover module (the first control position by change-over valve 110) and directly acts on brake cylinder, and now spacing module is inoperative, on service brake without impact.Now the brake-pressure of hydraulic oil changes by the first pressure curve G as shown in Figure 2, and brake-pressure can arrive maximum working pressure (MWP) rapidly, service brake safety when ensureing normally to travel.
When carrying out the operation of carrying stacking, spreader position and door frame inclination angle affect larger on whole vehicle stability.When detection suspender is in a high position, or grab door frame when case rows is sailed and do not tilt, then make change-over valve 110 electricly must be in the second control position, hydraulic oil will all flow into the flow regulating valve 121 of pressure limiting module, due to the restriction effect of flow regulating valve 121, pressure is set up and will be delayed when the change-over valve 110 than without flow regulating valve 121, and now the brake-pressure of hydraulic oil changes by the second pressure curve H as shown in Figure 2, brake will be more soft slow, not easily occur the overthrow accident caused because of sudden stop.
When service brake is removed, hydraulic oil can pass through check valve 122 oil return rapidly, thus ensures that service brake efficient solution is removed.
At some special operation condition; need to have higher requirements to service brake; experienced chaufeur is by the judgement to vehicle-state; the protective valve utilizing protection to remove pedal 30 and upper installation thereof removes master cock 40; in compulsory commutation service brake protective valve 100, change-over valve 110 obtains electricity condition; make service brake protective valve 100 switch to the first mode of operation from the second mode of operation, thus ensure good braking effect.In the process removed, owing to having carried out the protection of a period of time by service brake protective valve 100, working truck reality has tended towards stability state, therefore also reduces the risk of tumbling.And owing to adopting left foot operation, therefore avoid the maloperation of chaufeur.
Protect decontrol also can adopt other operation format in the present embodiment, such as hand push button etc.
Second embodiment
Fig. 4 is the principle schematic of the service brake protective valve of second embodiment of the invention.
The service braking control valve of the second embodiment and the difference of the first embodiment are, in the second embodiment, the voltage-limiting element of pressure limiting submodule is not throttling device, but pressure purger.
As shown in Figure 4, the service braking control valve 200 of the second embodiment has the first communication port C and the second communication port D, and the first communication port C is used for being connected with service brake valve, and the second communication port D is used for being connected with brake cylinder.Service brake valve protection valve 200 comprises handover module and pressure limiting module.Handover module and pressure limiting wired in parallel are arranged.Handover module comprises change-over valve 210.
Pressure limiting module only comprises a pressure limiting submodule 220.This pressure limiting submodule comprises the voltage-limiting element and check valve 222 that are arranged in parallel.
Voltage-limiting element is in particular reducing valve 221 in a second embodiment.The entrance point of reducing valve 221 is connected with the first communication port C, and the exit end of reducing valve 221 is connected with the second communication port D.
The entrance point of check valve 222 is connected with the second communication port D, and the exit end of check valve 222 is connected with the first communication port C.
In second embodiment, due to the depressurization of reducing valve 221, when the pressure of the first communication port C is certain, when working in the second operation mode, the pressure of the second communication port D is less than the pressure of the second communication port D when working in a first operation mode.Thus for hydraulic oil not-go end die block, the pressure limiting module with reducing valve 221 can change the output characteristic of the brake-pressure of hydraulic oil equally, make brake become soft slow, thus prevent or reduce the overthrow accident caused because of sudden stop.
In second embodiment, other unaccounted content all can with reference to the related content of the first embodiment.
3rd embodiment
Fig. 5 is the principle schematic of the service brake protective valve of third embodiment of the invention.
As shown in Figure 5, the service brake protective valve 300 of the 3rd embodiment has the first communication port E, the second communication port F and comprises handover module M1 and pressure limiting module M2.Wherein the first communication port E is used for being connected with the service brake valve of the service braking system of working truck, and the second communication port F is used for being connected with the brake cylinder of this service braking system.Wherein, handover module M1 can control service brake protective valve 300 and switches between the first mode of operation and the second mode of operation.At the first mode of operation, the first communication port E is communicated with by handover module M1 with the second communication port F, and at the second mode of operation, the first communication port E is communicated with by pressure limiting module M2 with the second communication port F.
As shown in Figure 5, the handover module M1 of the 3rd embodiment comprises change-over valve 310, change-over valve 310 comprises the first hydraulic fluid port and the second hydraulic fluid port and has the first control position (the left working position in Fig. 5) and the second control position (the right working position in Fig. 5), first hydraulic fluid port of change-over valve 310 is connected with the first communication port E, and the second hydraulic fluid port of change-over valve 310 is connected with the second communication port F.Wherein, be communicated with the second hydraulic fluid port at its first hydraulic fluid port of the first control position of change-over valve 310, service brake protective valve 300 is in the first mode of operation.Because the first hydraulic fluid port is communicated with the second hydraulic fluid port, the hydraulic oil come by the first communication port E flows to the second communication port F through the first hydraulic fluid port and the second hydraulic fluid port, thus the first communication port E is communicated with by change-over valve 310 with the second communication port F.Disconnect at its first hydraulic fluid port of the second control position of change-over valve 310 and the second hydraulic fluid port, service brake protective valve 300 is in the second mode of operation.At the second mode of operation, because the first hydraulic fluid port and the second hydraulic fluid port disconnect, the hydraulic oil come from the first communication port E can only flow to the second communication port F by pressure limiting module M2, therefore, is communicated with the second communication port F at the second mode of operation first communication port E by pressure limiting module M2.
In 3rd embodiment particularly, change-over valve 310 often drives solenoid directional control valve for 2/2-way.
In 3rd embodiment, handover module M1 and pressure limiting module M2 is arranged in parallel.The maintenance of service brake protective valve 100 is convenient in this setting.
Wherein, pressure limiting module M2 comprises the different multiple pressure limiting submodules of pressure limiting ability.As shown in Figure 5, in the present embodiment, pressure limiting module M2 comprises three pressure limiting submodules, is respectively the first pressure limiting submodule 320, second pressure limiting submodule 340 and the 3rd pressure limiting submodule 360.
As shown in Figure 5, each pressure limiting submodule comprises voltage-limiting element, and wherein, the entrance point of voltage-limiting element is connected with the first communication port E, and the exit end of voltage-limiting element is connected with the second communication port F.In the third embodiment, voltage-limiting element is reducing valve.In addition preferably, each pressure limiting submodule also comprises the check valve be arranged in parallel with voltage-limiting element.
In addition; in 3rd embodiment; service brake protective valve 300 also comprises selects module M3, at the second mode of operation, selects module M3 to be used in multiple pressure limiting submodule, select a pressure limiting submodule to be communicated with the first communication port E and the second communication port F by this selected pressure limiting submodule.
Select the way of realization of module M3 can have multiple.Preferably, module M3 is selected to comprise multiple chooser module, the pressure limiting submodule connection that each chooser module is corresponding with at least one.Further preferably, each chooser model calling is between the pressure limiting submodule and the first communication port E of correspondence.
In the present embodiment, each chooser module and a pressure limiting submodule are connected in series formation pressure limiting branch road, each pressure limiting branch circuit parallel connection correspondingly.
As shown in Figure 5, module is selected to comprise the first chooser module, the second chooser module and the 3rd chooser module totally three chooser modules.First chooser module comprises the first change-over valve 330, first change-over valve 330 and to connect with the first pressure limiting submodule 320 formation first pressure limiting branch road; Second chooser module comprises the second change-over valve 350, second change-over valve 350 and to connect with the second pressure limiting submodule 340 formation second pressure limiting branch road; 3rd chooser module the 3rd change-over valve the 370, three change-over valve 370 is connected with the 3rd pressure limiting submodule 360 formation the 3rd pressure limiting branch road.First pressure limiting branch road, the second pressure limiting branch road and the 3rd pressure limiting branch circuit parallel connection.
As shown in Figure 5, first pressure limiting submodule 320 comprises the first reducing valve 321 and the first check valve 322 be arranged in parallel, the entrance point of the first reducing valve 321 is connected with the first communication port E by the first change-over valve 330, the exit end of the first reducing valve 321 is connected with the second communication port F, the entrance point of the first check valve 322 is connected with the second communication port F, and the exit end of the first check valve 322 is connected by the first change-over valve 330 with the second communication port E.Second pressure limiting submodule 340 comprises the second reducing valve 341 and the second check valve 342 be arranged in parallel, the entrance point of the second reducing valve 341 is connected with the first communication port E by the second change-over valve 350, the exit end of the second reducing valve 341 is connected with the second communication port F, the entrance point of the second check valve 342 is connected with the second communication port F, and the exit end of the second check valve 342 is connected by the second change-over valve 350 with the first communication port E.3rd pressure limiting submodule 360 comprises the 3rd reducing valve 361 and the 3rd check valve 362 that are arranged in parallel, the entrance point of the 3rd reducing valve 361 is connected with the first communication port E by the 3rd change-over valve 370, the exit end of the 3rd reducing valve 361 is connected with the second communication port F, the entrance point of the 3rd check valve 362 is connected with the second communication port F, and the exit end of the 3rd check valve 362 is connected by the 3rd change-over valve 370 with the first communication port E.
In 3rd embodiment, in the second operation mode, when in each chooser module selecting module M3, the first change-over valve 330 is opened, the second change-over valve 350 ends, the 3rd change-over valve 370 ends, from the hydraulic oil of the first communication port E by flowing to the second communication port F after the first reducing valve 321 pressure limiting, and the first check valve 322 oil return can be passed through; When in each chooser module selecting module M3, the first change-over valve 330 ends, the second change-over valve 350 is opened, the 3rd change-over valve 370 ends, from the hydraulic oil of the first communication port E by flowing to the second communication port F after the second reducing valve 341 pressure limiting, and the second check valve 342 oil return can be passed through; When in each chooser module selecting module M3, the first change-over valve 330 ends, the second change-over valve 350 ends, the 3rd change-over valve 370 is opened, from the hydraulic oil of the first communication port E by flowing to the second communication port F after the 3rd reducing valve 361 pressure limiting, and the 3rd check valve 362 oil return can be passed through.
Wherein, each reducing valve can be uniform-pressure-drop valve, uniform-pressure-drop valve or proportional pressure reducing valve.In the present embodiment, first reducing valve 321, second reducing valve 341 and the 3rd reducing valve 361 are uniform-pressure-drop valve, wherein, the outlet pressures of the first reducing valve 321 is P1, the outlet pressures of the second reducing valve 341 is P2, the outlet pressures of the 3rd reducing valve 341 is that P3, P1, P2 and P3 are different, then the pressure limiting ability of the first pressure limiting submodule 320, the 3rd pressure limiting submodule 340 and the 3rd pressure limiting submodule 360 is different.Working truck work in the second operation mode time, can according to concrete working condition by select module M3 select optimal pressure limiting submodule to carry out pressure limiting.
Therefore; in the present embodiment; when change-over valve 310 action to the second control position; first hydraulic fluid port of change-over valve 310 and the second hydraulic fluid port are disconnected; now service brake protective valve 300 switches to the second mode of operation; hydraulic oil will arrive from the first communication port E and select module M3, after selecting module M3, flow out service brake protective valve 300 more again after the chosen pressure limiting submodule pressure limiting of pressure limiting module M2 through the second communication port F.
For empty container piling crane, can for different critical conditionss of tumbling, the reducing valve decompressed pressure that setting is corresponding, is subdivided into high, medium and low third gear to suspender present position, such as, can set P1 and be less than P2, P2 and be less than P3.Select module M3 to select the first change-over valve 321 to work when suspender is in a high position, restriction maximum brake pressure is P1, prevents sudden stop; Select module M3 to select the second change-over valve 341 to work when suspender is in meta, restriction maximum brake pressure is P2; Select module M3 to select the 3rd change-over valve 361 to work when suspender is in low level, restriction maximum brake pressure is P3.Therefore, the service brake protective valve 300 of the 3rd embodiment, for the first embodiment and the second embodiment, can be protected more targetedly, reduce the sacrifice to brake efficiency, ensures traffic safety.
In 3rd embodiment, other unaccounted part can with reference to the related content of the first embodiment and the second embodiment.
Known according to above description, more than the present invention each embodiment tool has the following advantages:
1, service brake protective valve can change the output characteristic of the brake-pressure of hydraulic oil when working truck band carries traveling; make it to become more soft slow; reduce and cause the risk of tumbling because of anxious touching on the brake; improve driving safety; increase the traveling comfort of driver's operation; and under normal traveling working condition, braking effect is substantially unaffected.
2, cost is lower, is easy to realize.
3, under special operation condition, as needed good braking effect, chaufeur can the defencive function of compulsory commutation service brake protective valve; Further, releasing process is different from normal running, and in this releasing process, vehicle has tended towards stability state, although therefore compulsory commutation defencive function, also can avoid because sudden stop is tumbled.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit; Although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the field are to be understood that: still can modify to the specific embodiment of the present invention or carry out equivalent replacement to portion of techniques feature; And not departing from the spirit of technical solution of the present invention, it all should be encompassed in the middle of the technical scheme scope of request of the present invention protection.
Claims (16)
1. a service brake protective valve, it is characterized in that, described service brake protective valve has the first communication port for being connected with service brake valve and the second communication port for being connected with brake cylinder, described service brake protective valve comprises handover module and pressure limiting module, described handover module switches between the first mode of operation and the second mode of operation for controlling described service brake protective valve, at described first mode of operation, described first communication port is communicated with described second communication port by described handover module, at described second mode of operation, described first communication port is communicated with by described pressure limiting module with described second communication port.
2. service brake protective valve according to claim 1, it is characterized in that, described handover module comprises change-over valve, described change-over valve comprises the first hydraulic fluid port and the second hydraulic fluid port and has the first control position and the second control position, first hydraulic fluid port of described change-over valve is connected with described first communication port, described second hydraulic fluid port is connected with described second communication port, wherein, be communicated with the second hydraulic fluid port at its first hydraulic fluid port of the first control position of described change-over valve, described service brake protective valve is in described first mode of operation; Disconnect at its first hydraulic fluid port of the second control position of described change-over valve and the second hydraulic fluid port, described service brake protective valve is in described second mode of operation.
3. service brake protective valve according to claim 1, it is characterized in that, when the pressure of described first communication port is certain, described in when working under described second mode of operation, the rate of pressure increase of the second communication port is less than the rate of pressure increase of the second communication port described in when working in this first operative mode; Or when the pressure of described first communication port is certain, described in when working under described second mode of operation, the pressure of the second communication port is less than the pressure of the second communication port described in when working in this first operative mode.
4. service brake protective valve according to claim 1, is characterized in that, described handover module and described pressure limiting wired in parallel.
5. service brake protective valve according to any one of claim 1 to 4, is characterized in that, described pressure limiting module comprises a pressure limiting submodule or the different multiple pressure limiting submodules of pressure limiting ability.
6. service brake protective valve according to claim 5; it is characterized in that; described pressure limiting module comprises described multiple pressure limiting submodule; described service brake protective valve also comprises selection module; at described second mode of operation, described selection module is used in described multiple pressure limiting submodule, select a pressure limiting submodule to be communicated with described first communication port and described second communication port by this selected pressure limiting submodule.
7. service brake protective valve according to claim 6, is characterized in that, described selection module comprises multiple chooser module, the described pressure limiting submodule connection that each described chooser module is corresponding with at least one.
8. service brake protective valve according to claim 7, is characterized in that, each described chooser module and a described pressure limiting submodule are connected in series formation pressure limiting branch road, each described pressure limiting branch circuit parallel connection correspondingly.
9. service brake protective valve according to claim 5; it is characterized in that, described pressure limiting submodule comprises voltage-limiting element, wherein; the entrance point of described voltage-limiting element is connected with described first communication port, and the exit end of described voltage-limiting element is connected with described second communication port.
10. service brake protective valve according to claim 9, is characterized in that, described voltage-limiting element comprises throttling device or pressure purger.
11. service brake protective valves according to claim 9; it is characterized in that; described pressure limiting submodule also comprises the check valve be arranged in parallel with described voltage-limiting element; wherein; the entrance point of described check valve is connected with described second communication port, and the exit end of described check valve is connected with described first communication port.
12. 1 kinds of working trucks; comprise service braking system; described service braking system comprises service brake valve and brake cylinder; it is characterized in that; described service braking system also comprises the service brake protective valve according to any one of claim 1 to 11; first communication port of described service brake protective valve is connected with described service brake valve, and the second communication port of described service brake protective valve is connected with described brake cylinder.
13. working trucks according to claim 12; it is characterized in that; described service braking system also comprises protection decontrol, and described protection decontrol switches to described first mode of operation for controlling described service brake protective valve from described second mode of operation.
14. working trucks according to claim 13; it is characterized in that; described protection decontrol comprises protection and removes pedal; the driver seat front that pedal is arranged at described working truck is removed in described protection; the left side that pedal is positioned at the line of centers of described driver seat is removed in described protection; wherein, described protection releasing pedal can control described service brake protective valve and switch to described first mode of operation from described second mode of operation.
15. working trucks according to claim 14; it is characterized in that; described protection decontrol also comprises to be removed the protective valve that pedal is connected remove master cock with described protection; described protective valve is removed master cock and is coupled with described handover module, and described protection releasing pedal controls described service brake protective valve by control described protective valve releasing master cock and switches to described first mode of operation from described second mode of operation.
16., according to claim 12 to the working truck according to any one of 15, is characterized in that, described working truck is empty container piling crane.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510901736.0A CN105416265B (en) | 2015-12-09 | 2015-12-09 | Valve and working truck are protected in service brake |
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| 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 |
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| CN105416265B CN105416265B (en) | 2018-10-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106218618A (en) * | 2016-09-07 | 2016-12-14 | 王明中 | A kind of automobile oil pressure resistance device |
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| CN105416265B (en) | 2018-10-02 |
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