CN109869477A - A kind of gearbox gear-shift protection system and engineering machinery - Google Patents
A kind of gearbox gear-shift protection system and engineering machinery Download PDFInfo
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- CN109869477A CN109869477A CN201910241399.5A CN201910241399A CN109869477A CN 109869477 A CN109869477 A CN 109869477A CN 201910241399 A CN201910241399 A CN 201910241399A CN 109869477 A CN109869477 A CN 109869477A
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Abstract
The invention discloses a kind of gearbox gear-shift protection system and engineering machinery, it includes: gear-shifting solenoid valve that gearbox gear-shift, which protects system, for realizing switching of the gearbox between I grades/II grades；Shift switch is two switches, connect with relay group；Relay group, for control the gear-shifting solenoid valve obtain it is electric/must not electricity；The relay group includes the first relay and the second relay, and S1, S2 of the shift switch are connect with the first relay, the second relay respectively, as the first relay, the circuit switch of the second relay；Gear-shifting solenoid valve is connected with a normally-closed contact in the second relay；Pressure switch, the signal input for acquiring brake system pressure signal, as the first relay, the second relay in relay group.System is protected in gear shift provided by the invention, is protected for engineering machinery chassis gearbox height gear shift；Vehicle in the process of moving, prevent driver's maloperation Gear-shift switch, cause gearbox and beat tooth.
Description
Technical field
The invention belongs to technical field of engineering machinery, in particular to a kind of gearbox gear-shift protection system and engineering machinery.
Background technique
The chassis walking of engineering machinery at present uses two grades of gearboxes, and gear shift form is parking gear shift.
Common two grades of the gearbox of engineering machinery at present can just be changed since gearbox designs determine that it needs to stop
Shelves, otherwise, are unable to complete gear shift, are easy to appear and beat tooth, or even damage gearbox.
Operator due to maloperation, easily appears in traveling during using the type chassis (two grades of gearboxes)
Gear shift in the process.After in-motion shifting, the failures such as tooth, gearbox damage are beaten in appearance, not only influence the normal use of equipment, and
It is long to repair replacing construction.
Product using parking shift transmission for the maloperation for preventing client's gear shift, causes gearbox in the prior art
Damage, there are three types of solutions:
(1) common form.It is nearby pasted in gear shift button (switch) and wakes up purpose mark (such as: " forbidding in vehicle travel process
Switch gear "), and by being clearly stated in product training and operation manual.
(2) corresponding controllers are input a signal into when travel speed is 0 by real-time detection Vehicle Speed, carried out
Logic judgment, at this point, gear shift can just be completed by pressing Gear-shift switch.
(3) hydraulic control system is used, by related hydraulic self-locking control, prevents gear shift in vehicle traveling.
The prior art has the following deficiencies:
In the prior art (1), since operator drives the habit (gear shift in traveling process) of non-engineering machinery vehicle, if do not had
It informs in time or note that the operation of gear shift in traveling easily occurs；In addition, engineering machinery working environment is severe, a period of time
Afterwards, related label (mark) obscures, is not easy to observe, and causes that operator can not be reminded in time.--- simple and easy, reliability is not
It is high.
In the prior art (2), the detection of travel speed can be detected by velocity sensor on gearbox, or detection passes
The revolving speed of moving axis.However, the velocity sensor above gearbox needs gearbox producer to be equipped with, (some gearboxes are not equipped with pair yet
Inductive sensing device and interface)；If using the method for detection rotating speed of transmission shaft, although simple possible, it is contemplated that sensor
Installation and applying working condition, reliability are also not very high.In addition, if using velocity sensor form, signal be pulse
Form (not being switching signal), needs to be linked into controller, realizes corresponding function, control with cooperation.--- it is at high cost, it is not easy reality
Existing or reliability is low.
It is using relevant hydraulic control, self-locking circuit, it can be achieved that relevant from lock control, reliability in the prior art (3)
Height, but corresponding at high cost, system complex.
Summary of the invention
Purpose: in order to overcome the deficiencies in the prior art, the present invention provide a kind of gearbox gear-shift protection system and
Engineering machinery.
Technical solution: in order to solve the above technical problems, the technical solution adopted by the present invention are as follows:
A kind of gearbox gear-shift protection system, comprising:
Gear-shifting solenoid valve, switching of the gear-shifting solenoid valve for realizing gearbox between I grades/II grades；Wherein, it obtains electric for height
Fast shelves must not electric be low or first gear；
Shift switch is two switches, and two are respectively S1 low-grade location, S2 high tap position, is connect with relay group, for controlling
The gear-shifting solenoid valve obtain it is electric/must not electricity；
Relay group, for control the gear-shifting solenoid valve obtain it is electric/must not electricity；The relay group includes the first relay and the
Two relays, S1, S2 of the shift switch are connect with the first relay, the second relay respectively, as the first relay,
The circuit switch of two relays；The gear-shifting solenoid valve is connected with a normally-closed contact in the second relay, the second relay obtain it is electric,
Then gear-shifting solenoid valve obtains electric；
Pressure switch, for acquiring brake system pressure signal, pressure signal reaches setting value, exports corresponding signal, as after
The signal input of first relay, the second relay in electric appliance group.
Preferably, the gearbox gear-shift protects system, and the gear-shifting solenoid valve is two position four-way hydraulics electricity
Magnet valve.
The signal output end of the pressure switch is divided into two-way, connect respectively with the first relay, the second relay.
As a wherein preferred embodiment, the gearbox gear-shift protects system, and the pressure switch setting is made in parking
On hydraulic circuit between the handle valve and vehicle bridge of dynamic system.Further, the pressure switch is closed type.
As wherein another program, the gearbox gear-shift protects system, and the pressure switch is arranged in service brake
On hydraulic circuit between the service braking pedal valve and vehicle bridge of system.Further, the pressure switch is open type.
Further, the gearbox gear-shift protects system, and the normally opened contact of the first relay K1 is K11, often
Closed contact is K12；The normally opened contact of second relay K2 is K22, K23, normally-closed contact K21；
Kp1 and Kp2 is the output signal of pressure switch, while exporting or not exporting；
S1 is that Gear-shift switch is in low-grade location, and S2 is that Gear-shift switch is in high tap position；
The normally opened contact K23 of second relay K2 connects with the electromagnetic valve coil Y of gearshift magnetic valve, and control gearshift magnetic valve obtains
Electricity, power loss；
Kp1, S1 series connection is switched as the control loop of the first relay K1；
Kp2, S2 series connection is switched as the control loop of the second relay K2；
It is connect after described K11, K21 are in parallel with Kp1, S1 with the first relay K1；
It is connect after described K22, K12 are in parallel with Kp2, S2 with the second relay K2.
On the other hand, the present invention also provides a kind of gearbox gear-shift guard methods, comprising:
Gear-shift switch signal is obtained, shift switch switching action is judged whether there is；
Obtain the pressure signal of parking brake system and/or service braking system hydraulic circuit；
According to the pressure signal of acquisition, judge whether engineering machinery vehicle is located at dead ship condition；
In response to judging that engineering machinery vehicle is located at dead ship condition, and there is shift switch switching action, output is to induction signal, control
Gearshift magnetic valve obtains electric/power loss and carries out gearbox-gear switching.
The present invention also provides a kind of engineering machinery, protect system including above-mentioned gearbox gear-shift.
It is portable construction, low in cost the utility model has the advantages that gearbox gear-shift provided by the invention protection system and engineering machinery,
It is reliable and stable and meet the requirements.It is mainly used in the concrete ejection trolley or similar projects vehicle of self-control engineering chassis, is realized
Gear shift protection in vehicle use process, prevents the problems such as vehicle does not stop and switches gear, gearbox is caused to damage.Tool
It has the advantage that
(1) by newly-increased two relays (pressure switch --- due to natively needing to acquire the signal, shown for instrument desk
Parking brake condition, not counting additional increase), it can realize that parking gear shift becomes on the basis of original gearbox gear-shift controls route
The gear shift of fast case is protected.
(2) operator's gear shift in vehicle traveling is effectively avoided, can prevent gearbox generation from beating tooth phenomenon.
(3) simultaneously, the newly-increased components of which are few, easy to accomplish, at low cost etc..
Detailed description of the invention
Fig. 1 is that the gearbox gear-shift of embodiment protects system construction drawing；
Fig. 2 is the electric control theory figure of embodiment；
In figure: preceding bridge 4, gearbox 5, rear axle 6, normally opened pressure switch 7, oil inlet pipe 11, service braking pedal valve 12, accumulator
13, oil return line 14, gear-shifting solenoid valve 15, handle valve 16, power supply 21, normally closed pressure switch 22, relay group 23.
Specific embodiment
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 description, 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 be it is illustrative, never as to the present invention and its application or make
Any restrictions.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Under every other embodiment obtained, 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, each portion shown in attached drawing
The size divided not is to draw 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 of book.In shown here and discussion all examples, any occurrence should be construed as merely illustratively, and
Not by way of limitation.Therefore, the other examples of exemplary embodiment can further include different values.It should also be noted that similar mark
Number and letter similar terms are indicated in following attached drawing, therefore, once be defined in a certain Xiang Yi attached drawing, then subsequent
It does not need that it is further discussed in attached drawing.
Embodiment 1
As shown in Figure 1, a kind of gearbox gear-shift protects system, including service braking system, parking brake system, electrical control system
System.
Wherein, service braking system includes: that braking oil sources (brake pump), service braking pedal valve, accumulator, pressure are opened
Pass, fluid pressure line and connector；
Parking brake system includes: handle valve, fluid pressure line and connector；
Electric control system includes: power supply, gear-shifting solenoid valve, relay group (control switch, including shift switch), pressure switch
And related harness.
System is protected in gear shift provided by the invention, is protected for engineering machinery chassis gearbox height gear shift；In vehicle
In the process of moving, driver's maloperation Gear-shift switch is prevented, causes gearbox and beats tooth.
Working principle:
Under normal circumstances, the type parking manual transmission, vehicle should press gearbox height gear in a stationary situation
Switching switch, corresponding gear-shifting solenoid valve obtains electric, and hydraulic oil pushes gear shifting oil cylinder movement, completes gear shift.
However, in some cases, since driver neglects (maloperation), Gear-shift switch is pressed in vehicle travel process,
Cause gearbox generation to beat tooth scene, damages gearbox.
It therefore, is that protection gearbox is answered in vehicle travel process while not yet stopping (or vehicle) if pressing Gear-shift switch
This is invalid.According to structural principle Fig. 1, Yao Shixian gear shift of the invention, firstly, pushing the handle valve of stopping brake to parking
On-position (that is: is in parking brake condition)；After parking brake system pressure drops to certain numerical value, pressure switch is beaten
It opens, corresponding relay control gear shift circuit is connected；At this point, after pressing Gear-shift switch, corresponding gear-shifting solenoid valve just electric, completion change
Fast case gear shift；Otherwise, if not under parking brake condition, corresponding shift switch is pressed, gearshift magnetic valve state remains unchanged.
Service braking system: in vehicle travel process, braking is provided.Indoor brake pedal is driven by stepping on, control
It makes and pressure oil is provided and act on vehicle bridge (can be rear service brake, be also possible to front and back wheel while braking), realize driving process
In braking.Specific implementation form can be all hydraulic braking system, be also possible to realize using brake fluid cylinder pressure (master cylinder)
Braking.
Service braking pedal valve: hydraulic control valve steps on different angles by foot, and corresponding output different pressures value mentions
For different brake force.
Parking brake system: after a stop of the vehicle, brake pressure systemic effect prevents vehicle in vehicle bridge or transfer case etc.
It is mobile.Specific implementation form can be controlled by hydraulic handle valve, be also possible to through mechanical pull rod (bracing wire) or automatically controlled
The form of hydraulic valve is realized.
Vehicle bridge up train braking principle: press-brake, spring release.When brake pressure is 0, vehicle is not braking.
Stopping brake principle in vehicle bridge: pressure release, spring braking.When brake pressure is 0, vehicle, which is in, to be braked, is static
State.
Handle valve: two operating positions, one is in driving status position (at this point, parking brake system pressure is not
0), another is the position (at this point, parking brake system pressure is 0) after vehicle parking.
Pressure switch: after detection pressure reaches setting numerical value, corresponding signal is exported, as the defeated of other control loops
Enter.It is generally divided into open type and closed type, wherein open type when pressure rises to setting value, is closed the switch and exported corresponding
Signal.Closed type when pressure drops to setting value, closes the switch and exports corresponding signal.
In some embodiments, as shown in Figure 1, a kind of gearbox gear-shift protects system, comprising:
Gear-shifting solenoid valve, switching of the gear-shifting solenoid valve for realizing gearbox between I grades/II grades；Wherein, it obtains electric for height
Fast shelves must not electric be low or first gear；
Shift switch is two switches, and two are respectively S1 low-grade location, S2 high tap position, is located in driver's cabin on operation panel,
Connect with relay group, for control the gear-shifting solenoid valve obtain it is electric/must not electricity；
Relay group, for control the gear-shifting solenoid valve obtain it is electric/must not electricity；The relay group includes the first relay and the
Two relays, S1, S2 of the shift switch are connect with the first relay, the second relay respectively, as the first relay,
The circuit switch of two relays；The gear-shifting solenoid valve is connected with a normally-closed contact in the second relay, the second relay obtain it is electric,
Then gear-shifting solenoid valve obtains electric；
Pressure switch, signal output end are divided into two-way, connect respectively with the first relay, the second relay；It is braked for acquiring
System pressure signal, pressure signal reach setting value, export corresponding signal, as the first relay in relay group, second after
The signal of electric appliance inputs.
In some embodiments, as shown in Figure 1, wherein service braking system mainly includes service braking pedal valve 12, stores
It can device 13；Wherein, braking system oil sources is connected to the oil inlet of service braking pedal valve 12 by oil inlet pipe 11；Service brake
12 oil return opening of treadle valve takes back fuel tank by oil return line 14；Before the outlet of service braking pedal valve 12 is separately connected by pipeline
The braking hydraulic fluid port of bridge 4 and rear axle 6；Meanwhile electric, power loss is obtained by control gear-shifting solenoid valve 15, realize gearbox 5 in gear I, shelves
Switch between the II of position.
Parking brake system includes: handle valve 16；The outlet of handle valve 16 passes through the braking hydraulic fluid port of piping connection rear axle 6；
Normally closed pressure switch 22 is provided on hydraulic circuit between the handle valve 16 and vehicle bridge；It is for detecting handle valve 16
No to switch to parking brake condition, cooperation carries out the output action of signal output/not.Normally closed pressure switch 22 is arranged in stopping brake
Handle valve 16 and vehicle bridge between hydraulic circuit.In the present embodiment, the lower limit value that normally closed pressure switch 22 is set is 20bar.
It when pressure is greater than 20bar, disconnects, no signal output；When pressure is equal to, is lower than 20bar (parking brake condition), corresponding output
Signal.
Another alternative solution, pressure switch are mounted in service brake circuit, and the service braking pedal valve 12 goes out
Mouthful be provided with normally opened pressure switch 7 on the hydraulic circuit of preceding 4/ rear axle 6 of bridge, for acquiring pressure signal, detection service brake
Whether treadle valve 12 switches to parking brake condition.In the present embodiment, the upper limit value that normally opened pressure switch 7 is set is 5bar.Pressure
When the big Mr. Yu's numerical value of power (such as: 5bar) (service brake state), output signal.In brake pedal, and presses and accordingly change
After position switch, it just may be implemented to shift gears；Meanwhile after unclamping pedal, corresponding gear-shifting solenoid valve, which obtains electricity condition, to be kept.
Electric control system, including power supply 21, the normally opened pressure switch 7 of normally closed pressure switch 22/, relay group 23, gear shift
Solenoid valve 15.
The relevant control principle of relay group 23 is in detail as shown in Figure 2.Wherein, the normally opened contact of the first relay K1 is K11,
Normally-closed contact is K12；The normally opened contact of second relay K2 is K22, K23, normally-closed contact K21；Gearshift magnetic valve 15 includes
Electromagnetic valve coil Y.Kp1 and Kp2 is the output signal of normally closed pressure switch 22, while exporting or not exporting；S1 is Gear-shift switch
In low-grade location, S2 is that Gear-shift switch is in high tap position；
The normally opened contact K23 of second relay K2 connects with the electromagnetic valve coil Y of gearshift magnetic valve 15, controls gearshift magnetic valve 15
Obtain electric, power loss；
Kp1, S1 series connection is switched as the control loop of the first relay K1；
Kp2, S2 series connection is switched as the control loop of the second relay K2；
It is connect after described K11, K21 are in parallel with Kp1, S1 with the first relay K1；
It is connect after described K22, K12 are in parallel with Kp2, S2 with the second relay K2.
Only the second relay K2 is obtained electric, gearshift magnetic valve 15 just it is electric.First relay K1 obtains electric, gearshift magnetic valve 15
It must not electricity.
In some embodiments, as shown in Fig. 2, being provided on the hydraulic circuit between handle valve 16 and vehicle bridge with using
For normally closed pressure switch 22:
(1) after starts vehicle, Gear-shift switch is sitting at S1(low grade)
(1-1) does not also switch gear, at this time due to Kp1(Kp2 if does not switch handle valve 16 to parking brake condition) it does not export,
K1 and K2 must not be electric simultaneously, then gearshift magnetic valve 15 also must not be electric at this time, is in low-grade location.
(1-2) is directly switch into S2(top grade if does not switch handle valve 16 to parking brake condition), at this time due to Kp1
(Kp2) it does not export, while K1 and K2 must not be electric, then gearshift magnetic valve 15 also must not be electric at this time, is in low-grade location.
(1-3) is if has switched handle valve 16 to parking brake condition, and switches to S2(top grade), at this time due to Kp1
(Kp2) there is output, then K2 obtains electric (K1 power loss), then gearshift magnetic valve 15 obtains electric, gear switch to high tap position；K2 obtains electric, and K22 is closed
It closes, when restoring handle valve 16 to driving states, Kp2 is not exported, but is connected at this time by K22 with normally-closed contact K12, and K2 is still
Must be electric, gearshift magnetic valve 15 is still kept as electricity condition.
After starting vehicle, Gear-shift switch is sitting at S2(top grade)
(2-1) does not also switch gear, at this time due to Kp1(Kp2 if does not switch handle valve 16 to parking brake condition) it does not export,
K1 and K2 must not be electric simultaneously, then gearshift magnetic valve 15 also must not be electric at this time, is in low-grade location.
(2-2) is directly switch into S1(low grade if does not switch handle valve 16 to parking brake condition), at this time due to Kp1
(Kp2) it does not export, while K1 and K2 must not be electric, then gearshift magnetic valve 15 also must not be electric at this time, is in low-grade location.
(2-3) is if has switched handle valve 16 to parking brake condition, and switches to S1(low grade), at this time due to Kp1
(Kp2) there is output, then K1 obtains electric (K2 power loss), then gearshift magnetic valve 15 must not be electric, gear switch to low-grade location；K1 obtains electric, K11
Closure；12, the Kp1 that loosens the brake is not exported, but is connected to normally-closed contact K21 by K11 at this time, K1 still it is electric, shift gears
Solenoid valve 15 must not still keep electricity condition.
During vehicle is advanced, Gear-shift switch is sitting at lower-speed state, and it is low-grade that switch is located at S1()
If under steam, being directly switch into S2(top grade), at this time due to Kp1(Kp2) do not export, K2 can not obtain electric, and K1 is in
Electricity condition is obtained, then gearshift magnetic valve 15 also must not be electric, keeps low-grade invariant position.
During vehicle is advanced, Gear-shift switch is sitting at fast state, and it is high-grade that switch is located at S2()
If under steam, being directly switch into S1(low grade), at this time due to Kp1(Kp2) do not export, K1 can not obtain electric, and K2 is in
Electricity condition is obtained, then gearshift magnetic valve 15 is kept as electricity, keeps high-grade invariant position.
During vehicle is advanced, Gear-shift switch is sitting at lower-speed state, and but maloperation is located at S2(top grade to switch)
(5-1) if under steam, directly S1(low grade) and S2(top grade) between switch when, since existing K1 and K2 can not be changed
Electricity condition, therefore can not directly switch gear；--- safety.
(5-2) if after stopping brake (handle valve 16 to parking brake condition), at this time due to Kp1(Kp2) have output, and by
S2(top grade is in shift switch), then gear automatically switches to high-grade state.It is off due to vehicle at this time --- peace
Entirely.
During vehicle is advanced, Gear-shift switch is sitting at fast state, and it is low-grade that switch is but located at S1()
(6-1) if under steam, directly S1(low grade) and S2(top grade) between switch when, since existing K1 and K2 can not be changed
Electricity condition, therefore can not directly switch gear --- safety.
(6-2) if after stopping brake (handle valve 16 to parking brake condition), at this time due to Kp1(Kp2) have output, and by
S1(low grade is in shift switch), then gear automatically switches to Low gear state.It is off due to vehicle at this time --- peace
Entirely.
Key point of the invention is:
(1) brake system pressure signal is detected, is believed using the output of pressure switch as the input of gearbox gear-shift control loop
Number；
(2) pressure switch output signal is two paths of signals；
(3) preferably, brake pressure signal is derived from the hydraulic circuit between the handle valve of stopping brake and vehicle bridge；
(4) handle valve is in parking brake condition, and presses gear shift button (Gear-shift switch) simultaneously, and gear shift just can be achieved；
(5) Gear-shift switch is pressed under parking brake condition by two relays and corresponding normally opened, normally-closed contact combination, realization
Afterwards, it can be achieved that gearbox gear-shift；Meanwhile after gear shift is completed and releases stopping brake, the shape of solenoid valve after gear shift can also be kept
State (does not change) with handle valve position to driving states.
In addition, a kind of gearbox gear-shift of the present embodiment protects system, it is all using replacement control using electric proportional control mode
Mode processed, such as hydraulic control mode, mechanical control method form equivalent transformation realize identical function gearbox gear-shift
Protection system, all falls within the scope of protection of the patent of the present invention；Overload oil compensating valve is arranged to load circuit in the application A/B load circuit
Carry out pressure limit and preventing from being emptied, it is all using replacement overload oil compensating valve, such as change overflow valve into, plug form sets the present invention
The simplification carried out is counted, the protection scope of the application is also belonged to.
On the other hand, the present invention also provides a kind of engineering machinery, protect system including above-mentioned gearbox gear-shift.
Embodiment 2
A kind of gearbox gear-shift guard method, comprising:
Gear-shift switch signal is obtained, shift switch switching action is judged whether there is；
Obtain the pressure signal of parking brake system and/or service braking system hydraulic circuit；
According to the pressure signal of acquisition, judge whether engineering machinery vehicle is located at dead ship condition；
In response to judging that engineering machinery vehicle is located at dead ship condition, and there is shift switch switching action, output is to induction signal, control
Gearshift magnetic valve obtains electric/power loss and carries out gearbox-gear switching.
The above is only a preferred embodiment of the present invention, it should be pointed out that: for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (10)
1. a kind of gearbox gear-shift protects system characterized by comprising
Gear-shifting solenoid valve, switching of the gear-shifting solenoid valve for realizing gearbox between I grades/II grades；Wherein, it obtains electric for height
Fast shelves must not electric be low or first gear；
Shift switch is two switches, and two are respectively S1 low-grade location, S2 high tap position, is connect with relay group, for controlling
The gear-shifting solenoid valve obtain it is electric/must not electricity；
Relay group, for control the gear-shifting solenoid valve obtain it is electric/must not electricity；The relay group includes the first relay and the
Two relays, S1, S2 of the shift switch are connect with the first relay, the second relay respectively, as the first relay,
The circuit switch of two relays；The gear-shifting solenoid valve is connected with a normally-closed contact in the second relay, the second relay obtain it is electric,
Then gear-shifting solenoid valve obtains electric；
Pressure switch, the letter for acquiring brake system pressure signal, as the first relay, the second relay in relay group
Number input.
2. gearbox gear-shift according to claim 1 protects system, which is characterized in that the gear-shifting solenoid valve is two four
Logical hydraulic buttery valve.
3. gearbox gear-shift according to claim 1 protects system, which is characterized in that the signal of the pressure switch exports
End is divided into two-way, connect respectively with the first relay, the second relay.
4. gearbox gear-shift according to claim 1 protects system, which is characterized in that the pressure switch setting is stopped
On hydraulic circuit between the handle valve and vehicle bridge of braking system.
5. gearbox gear-shift according to claim 4 protects system, which is characterized in that the pressure switch is closed type.
6. gearbox gear-shift according to claim 1 protects system, which is characterized in that the pressure switch setting is being driven a vehicle
On hydraulic circuit between the service braking pedal valve and vehicle bridge of braking system.
7. gearbox gear-shift according to claim 6 protects system, which is characterized in that the pressure switch is open type.
8. gearbox gear-shift according to claim 4 protects system, which is characterized in that the first relay K1's is normally opened
Contact is K11, normally-closed contact K12；The normally opened contact of second relay K2 is K22, K23, normally-closed contact K21；
Kp1 and Kp2 is the output signal of pressure switch, while exporting or not exporting；
S1 is that Gear-shift switch is in low-grade location, and S2 is that Gear-shift switch is in high tap position；
The normally opened contact K23 of second relay K2 connects with the electromagnetic valve coil Y of gearshift magnetic valve, and control gearshift magnetic valve obtains
Electricity, power loss；
Kp1, S1 series connection is switched as the control loop of the first relay K1；
Kp2, S2 series connection is switched as the control loop of the second relay K2；
It is connect after described K11, K21 are in parallel with Kp1, S1 with the first relay K1；
It is connect after described K22, K12 are in parallel with Kp2, S2 with the second relay K2.
9. a kind of gearbox gear-shift guard method characterized by comprising
Gear-shift switch signal is obtained, shift switch switching action is judged whether there is；
Obtain the pressure signal of parking brake system and/or service braking system hydraulic circuit；
According to the pressure signal of acquisition, judge whether engineering machinery vehicle is located at dead ship condition；
In response to judging that engineering machinery vehicle is located at dead ship condition, and there is shift switch switching action, output is to induction signal, control
Gearshift magnetic valve obtains electric/power loss and carries out gearbox-gear switching.
10. a kind of engineering machinery, which is characterized in that protect system including the described in any item gearbox gear-shifts of claim 1-8.
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| CN112728067A (en) * | 2021-01-19 | 2021-04-30 | 厦门宇龙机械有限公司 | Wheel excavator and high-low gear shift protection system and method thereof |
| CN109869477B (en) * | 2019-03-28 | 2024-01-26 | 徐州徐工施维英机械有限公司 | Gear box gear shift protection system and engineering machinery |
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| CN109869477B (en) | 2024-01-26 |
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