CN108443268B - 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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- CN108443268B CN108443268B CN201810181305.5A CN201810181305A CN108443268B CN 108443268 B CN108443268 B CN 108443268B CN 201810181305 A CN201810181305 A CN 201810181305A CN 108443268 B CN108443268 B CN 108443268B
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- support cylinder
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- rodless cavity
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Classifications
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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
-
- 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; the rod chamber and rodless cavity of hydraulic lock connection support cylinder; rod chamber and rodless cavity bypass are connected separately with accumulator; 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 pressure in the rodless cavity for passing through support cylinder and support cylinder push rod carries the conversion of pressure; 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 conditions occurred overload problems, guarantees 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 technique
Bridge inspection vehicle is a kind of for bridge floor detection, the special-purpose vehicle of maintenance.Before bridge inspection vehicle starts operation,
Its support leg mechanism is supported first, and complete vehicle weight combines support with tire by support leg mechanism, and 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 carrying.
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 conditions, and the carrying of support leg mechanism can have a greater change, in the limit
Under operating condition, 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
It can be crushed to will lead to bridge floor.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.
Summary of the invention
For above-mentioned problems of the prior art, 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 conditions of supporting leg for bridge inspection vehicle mechanism and ask
Topic guarantees that support leg mechanism securely and reliably works, to guarantee the stability and safety of vehicle, while 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 bracket 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 check valve 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 is connect with electric 4 signal of proportional pressure control valve.
The electricity proportional pressure-reducing valve 2 is fixed pressure reducing valve, is with the outlet pressure for guaranteeing that the rodless cavity of support cylinder 8 exports
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 liquid oil keeper carries pressure and branch in the rodless cavity for passing through support cylinder 8
The conversion for supportting 8 push rod of oil cylinder carrying pressure, calculates and obtains support cylinder 8 corresponding with the maximum support load of support leg mechanism
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
To electric proportional pressure control valve 4, as the oil pressure relief of electric proportional pressure control valve, to limit the maximum support load of support leg mechanism, in fact
Now to the overload protection of support leg mechanism.
Detailed process is as follows for the overload protection:
Firstly, calculating and setting the maximum support load of support leg mechanism, the maximum support load of support leg mechanism is input to
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 bracket 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 include:
When bridge inspection vehicle traveling 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 being connected with the rodless cavity of support cylinder 8 by shock loading suffered by support cylinder 8 into
Row recycling, and cooperate the throttle valve 7 connecting with the rodless cavity of support cylinder 8, so that the stress of support cylinder 8 is buffered and is become
In steady, so that support cylinder be protected 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 conditions
Make, while adapting to different road surfaces, operation road surface or support leg mechanism itself is avoided to be damaged.
Detailed description of the invention
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 lock；2- electricity proportional pressure-reducing valve；3- check valve；4- electricity
Proportional pressure control valve；
5- controller；6- rodless cavity accumulator；7- throttle valve；8- branch
Support oil cylinder；
9- rod chamber accumulator；10- bracket；11- idler wheel mechanism；12- vehicle
Frame.
Specific embodiment
For the technical solution and its brought beneficial effect that the present invention is further explained, in conjunction with Figure of description, this hair
Bright specific embodiment 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 bracket 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 bracket 10 are hinged；The bracket
12 bottom rear of vehicle frame of 10 upper end and bridge inspection vehicle is hinged, and the lower end of bracket 10 and the middle part of idler wheel mechanism 11 are hinged.
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 bracket 10 to be swung up, and bracket 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, which is in, stretches state entirely,
Outside the fully extended cylinder body of the push rod of support cylinder 8, the push rod of support cylinder 8 drives bracket 10 to lower swing, bracket 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 biggish 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 electric 4 pipeline of 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 and the rodless cavity hydraulic fluid port pipeline of support cylinder 8 connect
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 guarantee 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 overload protection method of support leg mechanism, detailed process is as follows for the overload protection method:
As shown in Fig. 2, support leg mechanism is packed up when support leg mechanism is under off working state, 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 bracket 10 to be swung up, bracket
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 in close state, the support cylinder 8
Liquid oil pressure in rod chamber is used to undertake the gravity of bracket 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 high pressure liquid oil starts to carry out fuel feeding, support cylinder 8 to the rodless cavity of support cylinder 8 through the oil inlet of hydraulic lock 1
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 bracket 10 downward
It swings, bracket 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 in close state, not outside not fuel feeding, the throttle valve 7 being connected with the rodless cavity of support cylinder 8, rodless cavity accumulation of energy
Bypass duct composed by device 6, electric proportional pressure control valve 4 and check valve 3 is closed.
As shown in figure 3, support leg mechanism stretching, extension, support cylinder 8 is in Quan Shenzhuan when under support leg mechanism is in running order
State, outside the fully extended cylinder body of the push rod of support cylinder 8, under the promotion of the push rod of support cylinder 8, bracket 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 biggish support loads, at this point, the oil feed line of cutting 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
Bypass duct composed by proportional pressure control valve 4 and check valve 3 is opened；The push rod of support cylinder 8 is under the action of support loads
To supporting oily rodless cavity to apply pressure, electric proportional pressure-reducing valve 2 passes through the liquid oil pressure force signal that the rodless cavity of support cylinder 8 is fed back,
Maintain the oil outlet pressure of electric proportional pressure-reducing valve 2 constant；
In above process, when being varied such as the operating condition of the upper mechanism of car of bridge inspection vehicle, the carrying of support leg mechanism is carried
Lotus will change therewith, the push rod of support cylinder 8 to support oily rodless cavity 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 the receiving of support leg mechanism, to prevent supporting leg from overload phenomenon occur；Controller 5 and electric proportional overflow
4 signal of valve connection, to control the oil pressure relief of electric proportional pressure control valve 4, the fulcrum that it is able to 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 guarantee 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:
Firstly, calculating and setting the maximum support load of support leg mechanism, the maximum support load of support leg mechanism is input to
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, taking square according to principle of moment balance as fulcrum using the hinge joint of bracket 10 and vehicle frame 12, passing 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 (4)
1. the overload protection hydraulic system of supporting leg for bridge inspection vehicle mechanism, the supporting leg for bridge inspection vehicle mechanism by bracket (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)；The throttling
The oil outlet of valve (7) respectively with rodless cavity accumulator (6), electric proportional pressure-reducing valve (2) and electricity proportional pressure control valve (4) piping connection；
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:
The electricity proportional pressure-reducing valve (2) is fixed pressure reducing valve, is with the outlet pressure for guaranteeing that the rodless cavity of support cylinder (8) exports
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 overload protection hydraulic system described in claim 1, and the controller (5) is based on torque
Equilibrium principle, and changing for pressure and support cylinder (8) push rod carrying pressure is carried by liquid oil keeper in the rodless cavity of support cylinder (8)
It calculates, the maximum for calculating liquid oil in the rodless cavity for obtaining support cylinder (8) corresponding with the maximum support load of support leg mechanism is held
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),
As the oil pressure relief of electric proportional pressure control valve, to limit the maximum support load of support leg mechanism, the mistake to support leg mechanism is realized
Carry protection；
Detailed process is as follows for the overload protection:
Firstly, calculating and setting the maximum support load of support leg mechanism, the maximum support load of support leg mechanism is input to control
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 bracket (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.
4. 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 include:
When bridge inspection vehicle traveling is in fluctuating bumpy road, pass through the rod chamber that is connected with the rod chamber of support cylinder (8) storage
Energy device and the rodless cavity accumulator (6) being connected with the rodless cavity of support cylinder (8) carry impact suffered by support cylinder (8)
Lotus is recycled, and cooperates the throttle valve (7) connecting with the rodless cavity of support cylinder (8), so that the stress of support cylinder (8) obtains
It tends to be steady to buffering, so that support cylinder be protected 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 |
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| 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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| 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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| CN102425582B (en) * | 2011-12-27 | 2015-02-25 | 徐州重型机械有限公司 | Hydraulic control valve and getting-off support leg control system of firefighting vehicle with hydraulic control valve |
| CN103061255B (en) * | 2013-01-11 | 2015-05-20 | 中国矿业大学 | Vertical arm oil cylinder buckling-restrained device and vertical arm oil cylinder buckling-restrained method for bridge detecting vehicle |
| CN106544954B (en) * | 2016-03-04 | 2018-06-26 | 徐工集团工程机械股份有限公司 | A kind of leg control system, method and bridge inspection vehicle |
-
2018
- 2018-03-06 CN CN201810181305.5A patent/CN108443268B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN108443268A (en) | 2018-08-24 |
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