CN108443268A - The overload protection hydraulic system and overload protection method of supporting leg for bridge inspection vehicle mechanism - Google Patents
The overload protection hydraulic system and overload protection method of supporting leg for bridge inspection vehicle mechanism Download PDFInfo
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- CN108443268A CN108443268A CN201810181305.5A CN201810181305A CN108443268A CN 108443268 A CN108443268 A CN 108443268A CN 201810181305 A CN201810181305 A CN 201810181305A CN 108443268 A CN108443268 A CN 108443268A
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- support cylinder
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- rodless cavity
- pressure
- overload protection
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
- F15B20/007—Overload
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
- F15B1/021—Installations or systems with accumulators used for damping
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/02—Servomotor systems with programme control derived from a store or timing device; Control devices therefor
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Vehicle Body Suspensions (AREA)
Abstract
The invention discloses the overload protection hydraulic systems and overload protection method of supporting leg for bridge inspection vehicle mechanism; in the overload protection hydraulic system; hydraulic lock connects the rod chamber and rodless cavity of support cylinder; rod chamber is connected separately with accumulator with rodless cavity bypass; support cylinder rodless cavity through throttle valve also respectively with electric proportional pressure-reducing valve and electric proportional pressure control valve piping connection; it is connected on the pipeline of throttle valve by electric proportional pressure-reducing valve and check valve is installed, electric proportional pressure control valve is also connected with controller；The overload protection method is based on principle of moment balance; and liquid oil keeper carries the conversion of pressure and support cylinder push rod carrying pressure in the rodless cavity for passing through support cylinder; the maximum carrying pressure signal of liquid oil in the rodless cavity for calculating the support cylinder obtained is sent to electric proportional pressure control valve by controller, the oil pressure relief as electric proportional pressure control valve.The present invention solves supporting leg for bridge inspection vehicle mechanism and works under different operating modes occurred overload problems, ensures that support leg mechanism securely and reliably works.
Description
Technical field
The invention belongs to the security protection technology fields of engineering truck, and in particular to the overload of supporting leg for bridge inspection vehicle mechanism
Protect hydraulic system and overload protection method.
Background technology
Bridge inspection vehicle is a kind of for bridge floor detection, the special-purpose vehicle of repair.Before bridge inspection vehicle starts operation,
Its support leg mechanism, complete vehicle weight is supported to combine support with tire by support leg mechanism first, the quantity of support leg mechanism is usually two
Or four.Support leg mechanism is flexible by support cylinder, realizes support part, after support leg mechanism support, bridge inspection vehicle it is upper
Mechanism of car movement is turned to bridge floor or less and works, and the unbalance loading weight of vehicle is mainly undertaken by support leg mechanism, i.e., by support leg mechanism
Support cylinder carries.
Due to support leg mechanism support cylinder at work, the hydraulic lock in hydraulic circuit can be by the hydraulic oil in oil circuit
Locked, therefore, upper mechanism of car is in the motion process of different operating modes, and the carrying of support leg mechanism can have a greater change, in the limit
Under operating mode, the bearing load of support leg mechanism will become very big, and since the fulcrum bearing capacity of carrying bridge floor is different, load is larger very
Extremely it will cause bridge floor that can be crushed.Meanwhile in bridge inspection vehicle traveling process, due to the ups and downs on ground, lead to supporting leg
Mechanism stress is unstable, and overloading happens occasionally, and support leg mechanism occurs and the phenomenon that weld cracking occurs, influences the stabilization of vehicle
Property and safety.
Invention content
For the above-mentioned prior art the problem of, the present invention provides the overload protections of supporting leg for bridge inspection vehicle mechanism
Hydraulic system and overload protection method solve the occurred overload that works under different operating modes of supporting leg for bridge inspection vehicle mechanism and ask
Topic, ensure support leg mechanism securely and reliably work, to ensure stability and the safety of vehicle, at the same avoid bridge pavement by
It destroys.In conjunction with specification, technical scheme is as follows：
The overload protection hydraulic system of supporting leg for bridge inspection vehicle mechanism, the supporting leg for bridge inspection vehicle mechanism by holder 10,
Support cylinder 8 and idler wheel mechanism 11 form, and the overload protection hydraulic system is by hydraulic lock 1, electric proportional pressure-reducing valve 2, unidirectional
Valve 3, electric proportional pressure control valve 4, controller 5, rodless cavity accumulator 6, throttle valve 7 and rod chamber accumulator 9 form；
The hydraulic lock 1 is connected between the rod chamber hydraulic fluid port of support cylinder 8 and rodless cavity hydraulic fluid port, rod chamber accumulator 9
It is connected in parallel on the pipeline that 8 rod chamber hydraulic fluid port of support cylinder is connect with hydraulic lock 1；
The throttle valve 7 is connected in parallel on the pipeline that 8 rodless cavity hydraulic fluid port of support cylinder is connect with hydraulic lock 1；The section
Flow the oil outlet of valve 7 respectively with 4 piping connection of rodless cavity accumulator 6, electric proportional pressure-reducing valve 2 and electric proportional pressure control valve；
It is mounted on to 3 one-way conduction of the check valve and is connected to by electric proportional pressure-reducing valve 2 on the pipeline of throttle valve 7；
The control signal receiving end of the electricity proportional pressure-reducing valve 2 is connected with the rodless cavity hydraulic fluid port of support cylinder 8；
The controller 5 is connect with electric 4 signal of proportional pressure control valve.
It is described electricity proportional pressure-reducing valve 2 be fixed pressure reducing valve, with ensure support cylinder 8 rodless cavity output outlet pressure be
Definite value.
The overload protection method of supporting leg for bridge inspection vehicle mechanism, the overload protection method is based on the overload protection liquid
Pressure system, the controller 5 is based on principle of moment balance, and carries pressure and branch by liquid oil keeper in the rodless cavity of support cylinder 8
The conversion for supportting 8 push rod of oil cylinder carrying pressure, calculates and obtains support cylinder corresponding with the maximum support load of support leg mechanism 8
The maximum carrying pressure of liquid oil in rodless cavity, and the maximum carrying pressure signal of liquid oil in the rodless cavity of support cylinder 8 is sent
It is real to limit the maximum support load of support leg mechanism as the oil pressure relief of electric proportional pressure control valve to electric proportional pressure control valve 4
Now to the overload protection of support leg mechanism.
The detailed process of the overload protection is as follows：
First, the maximum support load of support leg mechanism is input to by the maximum support load for calculating and setting support leg mechanism
Controller 5；
Then, branch corresponding with the maximum support load of support leg mechanism is calculated by the control module in controller 5
The maximum carrying pressure of liquid oil in the rodless cavity of oil cylinder 8 is supportted, specific calculating process is as follows：
According to principle of moment balance, square is taken as fulcrum using the hinge joint of holder 10 and vehicle frame 12, passes through calculation formula：
N × L1=F × L2
And the calculating in the rodless cavity of pressure and support cylinder 8 between liquid oil pressure is carried by the push rod of support cylinder 8
Formula：
F=P × π × d2/4
It establishes in the rodless cavity of support cylinder 8 between the maximum carrying pressure and the maximum support load of support leg mechanism of liquid oil
Functional relation：
P=4 × N × L1/ (π × d2×L2)
Wherein：
N is the maximum support load of support leg mechanism；
F is that the push rod end maximum of support cylinder carries pressure；
P is the maximum carrying pressure of liquid oil in the rodless cavity of support cylinder；
L1 is the arm of force of the maximum support load N of support leg mechanism；
L2 is that the push rod end maximum of support cylinder carries the arm of force of pressure F；
Geometric dimension when L1 and L2 is supported with supporting leg is related, is measurable known quantity；
D is the rodless cavity inner diameter of support cylinder 8, is measurable known quantity；
Finally, the maximum carrying pressure signal of liquid oil in the rodless cavity of support cylinder 8 is sent to electric proportional pressure control valve 4,
Oil pressure relief as electric proportional pressure control valve.
The overload protection method further includes：
When bridge inspection vehicle is travelled in fluctuating bumpy road, pass through the rod chamber being connected with the rod chamber of support cylinder 8
Accumulator and the rodless cavity accumulator 6 that is connected with the rodless cavity of support cylinder 8 by the shock loading suffered by support cylinder 8 into
Row recycling, and coordinate the throttle valve 7 being connect with the rodless cavity of support cylinder 8 so that the stress of support cylinder 8 is buffered and is become
In steady, to protect support cylinder to avoid damaging.
Compared with prior art, the beneficial effects of the present invention are：
1, in overload protection hydraulic system of the present invention, in the rodless cavity by electric proportional pressure control valve control support cylinder
The maximum value of pressure effectively prevent support leg mechanism overload phenomenon occur to limit the maximum load of support leg mechanism.
2, in overload protection hydraulic system of the present invention, the throttle valve being sequentially connected in series with support cylinder rodless cavity and accumulation of energy
Device is adjusted dynamic impact loads and tends to be steady, and can jolt steady operation on ground in fluctuating, avoid the close of support cylinder
Sealing is damaged because of impact.
3, in overload protection hydraulic system of the present invention, the oil pressure relief of electric proportional pressure control valve is controlled by controller,
To adjust the maximum support load of support leg mechanism, it ensure that support leg mechanism being capable of reliable and stable ground work under different operating modes
Make, while adapting to different road surfaces, operation road surface or support leg mechanism itself is avoided to be damaged.
Description of the drawings
Fig. 1 is the hydraulic circuit schematic diagram of overload protection arrangement of the present invention；
Fig. 2 is supporting leg for bridge inspection vehicle mechanism collapsed state schematic diagram；
Fig. 3 is that supporting leg for bridge inspection vehicle mechanism stretches and is supported in state of ground schematic diagram；
In figure：
1- hydraulic locks；2- electricity proportional pressure-reducing valves；3- check valves；4- electricity proportional pressure control valves；
5- controllers；6- rodless cavity accumulators；7- throttle valves；8- support cylinders；
9- rod chamber accumulators；10- holders；11- idler wheel mechanisms；12- vehicle frames.
Specific implementation mode
For the technical solution that the present invention is further explained and its caused advantageous effect, in conjunction with Figure of description, this hair
Bright specific implementation mode is as follows：
The invention discloses a kind of overload protection hydraulic systems of supporting leg for bridge inspection vehicle mechanism, as shown in Fig. 2, bridge is examined
Measuring car support leg mechanism is made of holder 10, support cylinder 8 and idler wheel mechanism 11.The cylinder body end and bridge of the support cylinder 8
12 lower front of vehicle frame for detecting vehicle is hinged, and the push rod end of support cylinder 8 and the middle part of the holder 10 are hinged；The holder
10 upper end and 12 bottom rear of vehicle frame of bridge inspection vehicle are hinged, and the lower end of holder 10 is hinged with the middle part of idler wheel mechanism 11.
As shown in Fig. 2, supporting leg for bridge inspection vehicle mechanism is in off working state, at this point, support cylinder 8 is in full reduced shape
The push rod of state, support cylinder 8 is reduced in cylinder body completely, and the push rod of support cylinder 8 drives holder 10 to be swung up, and holder 10 is in turn
The idler wheel mechanism 11 of lower section has been driven to move upwards, idler wheel mechanism 11 has hanged and far from ground；
As shown in figure 3, supporting leg for bridge inspection vehicle mechanism is in running order, at this point, support cylinder 8 is in stretches state entirely,
Outside the fully extended cylinder body of push rod of support cylinder 8, the push rod of support cylinder 8 drives holder 10 to lower swing, holder 10 and then band
The idler wheel mechanism 11 for having moved lower section moves downward, and idler wheel mechanism 11 falls and be supported in ground, at this point, support leg mechanism is supported on ground
On face, the unbalance loading weight of bridge inspection vehicle is mainly undertaken by support leg mechanism, and support leg mechanism subjects larger support loads.
As shown in Figure 1, the overload protection hydraulic system is by hydraulic lock 1, electric proportional pressure-reducing valve 2, check valve 3, electric ratio
Overflow valve 4, controller 5, rodless cavity accumulator 6, throttle valve 7 and rod chamber accumulator 9 form.The hydraulic lock 1 is connected to
Between the rod chamber hydraulic fluid port and rodless cavity hydraulic fluid port of support cylinder 8, rod chamber accumulator 9 is connected in parallel on 8 rod chamber hydraulic fluid port of support cylinder
On the pipeline being connect with hydraulic lock 1；The throttle valve 7 is connected in parallel on the pipeline that 8 rodless cavity hydraulic fluid port of support cylinder is connect with hydraulic lock 1
On；The oil outlet of the throttle valve 7 connects with rodless cavity accumulator 6, electric proportional pressure-reducing valve 2 and 4 pipeline of electric proportional pressure control valve respectively
It connects；Check valve 3 is connected on the pipeline that throttle valve 7 is connect with electric proportional pressure-reducing valve 2, and the check valve 3 is electric proportional pressure-reducing valve 2
To 7 one-way conduction of throttle valve, the control signal receiving end of electric proportional pressure-reducing valve 2 connects with the rodless cavity hydraulic fluid port pipeline of support cylinder 8
It connects, the electricity proportional pressure-reducing valve 2 is fixed pressure reducing valve, and the outlet pressure signal of electric proportional pressure-reducing valve 2 is by support cylinder 8 without bar
Cavity pressure provides, and electric proportional pressure-reducing valve 2 can ensure the outlet pressure of the rodless cavity output of support cylinder 8 using fixed pressure reducing valve
For definite value；The controller 5 is connect with the control end signal of electric proportional pressure control valve 4, and the maximum of support leg mechanism is inputted to controller 5
The maximum support load signal of support loads, support leg mechanism can be converted into pressure signal, and be delivered to electric proportional pressure control valve 4, from
And control the oil pressure relief of electric proportional pressure control valve 4.
According to the overload protection hydraulic system of above-mentioned supporting leg for bridge inspection vehicle mechanism, the present invention also provides bridge inspection vehicles
The detailed process of the overload protection method of support leg mechanism, the overload protection method is as follows：
As shown in Fig. 2, when support leg mechanism is under off working state, support leg mechanism is packed up, and the support cylinder 8 is in
The push rod of full reduced state, support cylinder 8 is reduced in cylinder body completely, and the push rod of support cylinder 8 drives holder 10 to be swung up, holder
10 have driven the idler wheel mechanism 11 of lower section to move upwards in turn, and idler wheel mechanism 11 has hanged and far from ground to highest point, at this point, whole
The oil feed line of a hydraulic system is closed, and 1 locking of hydraulic lock, the check valve 3 is closed, the support cylinder 8
Liquid oil pressure in rod chamber is used to undertake the gravity of holder 10 and idler wheel mechanism 11；
Support leg mechanism is under off working state, when bridge inspection vehicle traveling is on the road surface that fluctuating is jolted, support cylinder 8
By the rod chamber accumulator by the shock loading from ground, being connected with the rod chamber of support cylinder 8 and with support cylinder 8
Rodless cavity connected rodless cavity accumulator 6 shock loading suffered by support cylinder 8 is recycled, and be equipped with support cylinder
The throttle valve 7 of 8 rodless cavity connection so that the stress of support cylinder 8 is buffered and tended to be steady, to protect support cylinder
Sealing element avoid damaging.
When support leg mechanism is from off working state to when working condition transition, the oil feed line of hydraulic system is opened, hydraulic pressure system
System starts fuel feeding, and oil inlet of the high pressure liquid oil through hydraulic lock 1 starts to carry out fuel feeding, support cylinder 8 to the rodless cavity of support cylinder 8
Rodless cavity in high-voltage oil liquid push the push rod of support cylinder 8 to stretch out, the push rod of support cylinder 8 drives holder 10 downward
It swings, holder 10 has driven the idler wheel mechanism 11 of lower section to move downward in turn, and idler wheel mechanism 11 is fallen；During this, electric ratio
Pressure reducing valve 2 is closed, not outside not fuel feeding, the throttle valve 7 being connected with the rodless cavity of support cylinder 8, rodless cavity accumulation of energy
The bypass duct that device 6, electric proportional pressure control valve 4 and check valve 3 are formed is closed.
As shown in figure 3, when under support leg mechanism is in running order, support leg mechanism stretching, extension, support cylinder 8 is in stretches shape entirely
State, outside the fully extended cylinder body of push rod of support cylinder 8, under the promotion of the push rod of support cylinder 8, holder 10 drives idler wheel mechanism
11 drop down onto ground, and are supported in ground, at this point, the unbalance loading weight of bridge inspection vehicle is mainly undertaken by support leg mechanism, support leg mechanism
Support cylinder 8 subject larger support loads, at this point, the oil feed line of cut-out hydraulic lock 1, the locking again of hydraulic lock 1, electricity
The oil inlet of proportional pressure-reducing valve 2 starts throttle valve 7, rodless cavity accumulator 6, the electricity that fuel feeding is connected with the rodless cavity of support cylinder 8
The bypass duct that proportional pressure control valve 4 and check valve 3 are formed is opened；The push rod of support cylinder 8 is under the action of support loads
To the oily rodless cavity application pressure of support, the liquid oil pressure force signal that electric proportional pressure-reducing valve 2 is fed back by the rodless cavity of support cylinder 8,
Maintain the oil outlet pressure of electric proportional pressure-reducing valve 2 constant；
In above process, when being varied from such as the operating mode of the upper mechanism of car of bridge inspection vehicle, the carrying of support leg mechanism carries
Lotus will change therewith, the push rod of support cylinder 8 to the oily rodless cavity of support apply pressure also changes therewith, the pressure after variation
Signal feeds back to electric proportional pressure-reducing valve 2, and the oil outlet pressure of electric proportional pressure-reducing valve 2 will be adjusted to 8 rodless cavity of support cylinder therewith
Liquid oil pressure after variation, and keep constant.
When the bearing load of the support cylinder 8 of support leg mechanism changes suddenly, it is connected with the rodless cavity of support cylinder 8
Throttle valve 7 will slow down displacement amplitude of fluctuation of the support cylinder 8 under load catastrophe.
In above process, the maximum of liquid oil pressure in the rodless cavity of support cylinder 8 is controlled by electric proportional pressure control valve 4
Value, to limit the maximum load of support leg mechanism born, to prevent supporting leg from overload phenomenon occur；Controller 5 and electric proportional overflow
4 signal of valve connects, with the oil pressure relief of control electricity proportional pressure control valve 4, the fulcrum that it can bear due to different work road surfaces
Load is different, meanwhile, the difference of support leg mechanism structure size keeps the maximum load-carrying capacity of support leg mechanism also different, to ensure to make
Industry road surface is not destroyed or support leg mechanism itself is not damaged, and the overflow pressure of electric proportional pressure control valve 4 can be adjusted by controller 5
Power adjusts the maximum support load of support leg mechanism, to prevent the generation of overloading；
The method that the controller 5 adjusts the oil pressure relief of electric proportional pressure control valve 4 is as follows：
First, the maximum support load of support leg mechanism is input to by the maximum support load for calculating and setting support leg mechanism
Controller 5；
Then, branch corresponding with the maximum support load of support leg mechanism is calculated by the control module in controller 5
The maximum carrying pressure of liquid oil in the rodless cavity of oil cylinder 8 is supportted, specific calculating process is as follows：
As shown in figure 3, according to principle of moment balance, square is taken as fulcrum using the hinge joint of holder 10 and vehicle frame 12, passes through meter
Calculate formula：
N × L1=F × L2
And the calculating in the rodless cavity of pressure and support cylinder 8 between liquid oil pressure is carried by the push rod of support cylinder 8
Formula：
F=P × π × d2/4
It establishes in the rodless cavity of support cylinder 8 between the maximum carrying pressure and the maximum support load of support leg mechanism of liquid oil
Functional relation：
P=4 × N × L1/ (π × d2×L2)
Wherein：
N is the maximum support load of support leg mechanism；
F is that the push rod end maximum of support cylinder carries pressure；
P is the maximum carrying pressure of liquid oil in the rodless cavity of support cylinder；
L1 is the arm of force of the maximum support load N of support leg mechanism；
L2 is that the push rod end maximum of support cylinder carries the arm of force of pressure F；
Geometric dimension when L1 and L2 is supported with supporting leg is related, is measurable known quantity；
D is the rodless cavity inner diameter of support cylinder 8, is measurable known quantity.
Finally, the maximum carrying pressure signal of liquid oil in the rodless cavity of support cylinder 8 is sent to electric proportional pressure control valve 4,
Oil pressure relief as electric proportional pressure control valve.
Claims (5)
1. the overload protection hydraulic system of supporting leg for bridge inspection vehicle mechanism, the supporting leg for bridge inspection vehicle mechanism by holder (10),
Support cylinder (8) and idler wheel mechanism (11) composition, it is characterised in that：
The overload protection hydraulic system is by hydraulic lock (1), electric proportional pressure-reducing valve (2), check valve (3), electric proportional pressure control valve
(4), controller (5), rodless cavity accumulator (6), throttle valve (7) and rod chamber accumulator (9) composition；
The hydraulic lock (1) is connected between the rod chamber hydraulic fluid port and rodless cavity hydraulic fluid port of support cylinder (8), rod chamber accumulator
(9) it is connected in parallel on the pipeline that support cylinder (8) rod chamber hydraulic fluid port is connect with hydraulic lock (1)；
The throttle valve (7) is connected in parallel on the pipeline that support cylinder (8) rodless cavity hydraulic fluid port is connect with hydraulic lock (1)；It is described
The oil outlet of throttle valve (7) connects with rodless cavity accumulator (6), electric proportional pressure-reducing valve (2) and electric proportional pressure control valve (4) pipeline respectively
It connects；
It is mounted on to check valve (3) one-way conduction and is connected on the pipeline of throttle valve (7) by electric proportional pressure-reducing valve (2)；
The control signal receiving end of the electricity proportional pressure-reducing valve (2) is connected with the rodless cavity hydraulic fluid port of support cylinder (8)；
The controller (5) connect with electric proportional pressure control valve (4) signal.
2. the overload protection hydraulic system of supporting leg for bridge inspection vehicle mechanism as described in claim 1, it is characterised in that：
It is described electricity proportional pressure-reducing valve (2) be fixed pressure reducing valve, with ensure support cylinder (8) rodless cavity output outlet pressure be
Definite value.
3. the overload protection method of supporting leg for bridge inspection vehicle mechanism, it is characterised in that：
The overload protection method is based on the overload protection hydraulic system described in claim (1), and the controller (5) is based on power
Square equilibrium principle, and pressure is carried by liquid oil keeper in the rodless cavity of support cylinder (8) and carries pressure with support cylinder (8) push rod
Conversion calculates the maximum of liquid oil in the rodless cavity for obtaining support cylinder (8) corresponding with the maximum support load of support leg mechanism
Pressure is carried, and the maximum carrying pressure signal of liquid oil in the rodless cavity of support cylinder (8) is sent to electric proportional pressure control valve
(4), the oil pressure relief as electric proportional pressure control valve is realized to limit the maximum support load of support leg mechanism to support leg mechanism
Overload protection.
4. the overload protection method of supporting leg for bridge inspection vehicle mechanism as claimed in claim 3, it is characterised in that：
The detailed process of the overload protection is as follows：
First, the maximum support load of support leg mechanism is input to control by the maximum support load for calculating and setting support leg mechanism
Device (5)；
Then, support corresponding with the maximum support load of support leg mechanism is calculated by the control module in controller (5)
The maximum carrying pressure of liquid oil, specific calculating process are as follows in the rodless cavity of oil cylinder (8)：
According to principle of moment balance, square is taken as fulcrum using the hinge joint of holder (10) and vehicle frame (12), passes through calculation formula：
N × L1=F × L2
And the calculation formula in the rodless cavity of pressure and support cylinder 8 between liquid oil pressure is carried by the push rod of support cylinder 8：
F=P × π × d2/4
Establish the letter between the maximum carrying pressure and the maximum support load of support leg mechanism of liquid oil in the rodless cavity of support cylinder 8
Number relational expression：
P=4 × N × L1/ (π × d2×L2)
Wherein：
N is the maximum support load of support leg mechanism；
F is that the push rod end maximum of support cylinder carries pressure；
P is the maximum carrying pressure of liquid oil in the rodless cavity of support cylinder；
L1 is the arm of force of the maximum support load N of support leg mechanism；
L2 is that the push rod end maximum of support cylinder carries the arm of force of pressure F；
Geometric dimension when L1 and L2 is supported with supporting leg is related, is measurable known quantity；
D is the rodless cavity inner diameter of support cylinder (8), is measurable known quantity；
Finally, the maximum carrying pressure signal of liquid oil in the rodless cavity of support cylinder (8) is sent to electric proportional pressure control valve (4),
Oil pressure relief as electric proportional pressure control valve.
5. the overload protection method of supporting leg for bridge inspection vehicle mechanism as claimed in claim 3, it is characterised in that：
The overload protection method further includes：
When bridge inspection vehicle is travelled in fluctuating bumpy road, stored by the rod chamber being connected with the rod chamber of support cylinder (8)
Energy device and the rodless cavity accumulator (6) being connected with the rodless cavity of support cylinder (8) carry the impact suffered by support cylinder (8)
Lotus is recycled, and coordinates the throttle valve (7) being connect with the rodless cavity of support cylinder (8) so that the stress of support cylinder (8) obtains
It tends to be steady to buffering, to protect support cylinder to avoid damaging.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810181305.5A CN108443268B (en) | 2018-03-06 | 2018-03-06 | The overload protection hydraulic system and overload protection method of supporting leg for bridge inspection vehicle mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810181305.5A CN108443268B (en) | 2018-03-06 | 2018-03-06 | The overload protection hydraulic system and overload protection method of supporting leg for bridge inspection vehicle mechanism |
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| Publication Number | Publication Date |
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| CN108443268A true CN108443268A (en) | 2018-08-24 |
| CN108443268B CN108443268B (en) | 2019-04-05 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109612673A (en) * | 2018-12-29 | 2019-04-12 | 上海核工程研究设计院有限公司 | A kind of high energy pipeline whipping simulation test bench device |
| CN110285107A (en) * | 2019-08-01 | 2019-09-27 | 江苏集萃道路工程技术与装备研究所有限公司 | A kind of the passive type control valve group and thrust wheel system of thrust wheel |
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| CN109612673A (en) * | 2018-12-29 | 2019-04-12 | 上海核工程研究设计院有限公司 | A kind of high energy pipeline whipping simulation test bench device |
| CN110285107A (en) * | 2019-08-01 | 2019-09-27 | 江苏集萃道路工程技术与装备研究所有限公司 | A kind of the passive type control valve group and thrust wheel system of thrust wheel |
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