CN1077926A

CN1077926A - Semi-automatic jack type multi-function weighing machine on vehicle

Info

Publication number: CN1077926A
Application number: CN 93112318
Authority: CN
Inventors: 姚信全; 姚波; 戴建平
Original assignee: YAN XINQUAN
Current assignee: YAN XINQUAN
Priority date: 1993-01-14
Filing date: 1993-01-14
Publication date: 1993-11-03

Abstract

The present invention is the multifunctional assembled vehicle electronics tonnage of an a kind of LOAD CELLS hydraulic jack instrument.Be that several LOAD CELLS hydraulic jack assemblies are actively connected on respectively on the vehicle bridge of front and back, preparation one cover S. A. gas (or liquid) control operation actuating device and weight display etc., truck is had can static whenever and wherever possible S. A. accurately weigh rapidly, manually jack realize traction engine S. A. fast aeration, change tire, the saving oneself when falling into car of keeping in repair, skid, tire, the unloading of leaf spring S. A. significantly improved functions such as scanning frequency and Tire ﹠ Tube, leaf spring life-span when stopped night.Be applicable to all kinds of trucies.

Description

Semi-automatic jack type multi-function weighing machine on vehicle

(1) general introduction: the invention discloses new mode and novel tonnage instrument product that a kind of truck is weighed.The present invention is the multifunctional assembled vehicle electronics tonnage of an a kind of S. A. LOAD CELLS hydraulic jack instrument.But the feature of half invention is LOAD CELLS hydraulic jack (compound type) assembly several semi-automatic operations (to be annotated: generally adorn three, also can only adorn two or only adorn this assembly in preceding sedan-chair center at sedan-chair two ends, back; Or adorn three hydraulic jacks, wherein have only one of two of back sedan-chairs or preceding sedan-chair that LOAD CELLS is arranged.) be movably arranged on respectively on the forward and backward car sedan-chair and (can turn round around the car sedan-chair; referring to accompanying drawing one, two), and dispose cover S. A. gas control (or hydraulic control) handling device, double acting solution-air sundstrand pump (or oil pump and driving device thereof), weight display, locking indicating device and tire leaf spring uninstall protection device etc.Its similar vehicle electronics ground weigher when weighing, truck is had can accurately weigh rapidly or weigh while freighting by static whenever and wherever possible S. A.; Overload indication or warning; And when making truck have heavy duty whenever and wherever possible (manually jack) carry out the tire S. A. rapidly and be inflated to best air pressure (air-pressure gauge display of tyre atmospheric pressure value is arranged), avoid the driver to inflate by rule of thumb; When heavy load truck is parked night, tire, steel spring (hereinafter to be referred as leaf spring) but the S. A. unloading protecting; Manually jack repairs, changes tire fast, transfers the saving oneself rapidly when falling into car of skidding in brake and the travelling truck way, makes the weighing of truck, moves, maintenance, tire leaf spring unloading protecting etc. are greatly convenient; Can improve the functions such as service life of the scanning frequency of truck and wheel, the inner tube of a tyre, leaf spring, car sedan-chair significantly, produce remarkable economic efficiency and social benefit, and can alleviate effectively that the driver inflates, repairs, changes tire on the way, the fatigue when transferring brake, remove driver's difficulty and bitter brain.Applicable to all kinds of trucies.

In order to safeguard the express highway that involves great expense, minimizing too much easily causes express highway pavement damage, the unusual damage of other parts of truck and the generation of traffic accident because of the truck overload, will carry out strict load carrying ability inspection to the truck at running on expressway.(establish check post on the way, first dynamic load generaI investigation is carried out static load check and severe overweight punishment to the overload car again).The management that comes to this of external express highway, so the truck automatic weighing will seem even more important.

Since the fifties, have both at home and abroad many mechanisms and expert develop diversified truck call oneself the refitting put.As: the patent No. of China is (CN2034274U, CN2036273U, CN2038229, CN2045847U, CN2047367U, CN2061686U, CN2064050U and number of patent application: 86107195A, 87201707,882172042 and U.S. Patent number: VSPatent4456084 etc.But weighing certainly of truck do not obtain general application so far, and especially at home, its major cause is behavior of structure and the member characteristic that the sensing system of all kinds of tonnage instrument mostly depends on truck self.Because these members of truck are big and coarse, cause when the marked change of the difference of the material of these members, geomery, condition of heat treatment, new and old usage degree etc., ground injustice, the unbalance loading when loading, load carrying ability, the work of truck auxiliary spring that the sudden change of rigidity of plate spring, truck operating mode are changeable, two auxiliary springs are not necessarily worked again simultaneously, influence of various factors such as the friction force influence between plate spring sheet, it is complicated and irregular to make it change.The tonnage instrument sensing system that has is in work (stressed) state etc. all the time once loading onto car, therefore error big for all kinds of tonnage instrument ubiquities, weighing precision is low, unstable properties, life-span is short, function singleness, shortcomings such as cost height, particularly because the truck compact conformation, it is again high-speed cruising, be subjected to sharp pounding and impact, cause all kinds of tonnage instrument that difficulty is installed mostly onboard, the assembling and the maintenance that also influence other parts of truck self that have, need change the local structure shape of some member of truck-this is again a very tall order concerning the truck manufacturing of large scale production, so truck is weighed and is still relied on a few fixed so far, expensive automobile ground weigher (mainly containing two kinds of mechanical type and electronic types), every time truck will be weighed, and must cross weighbridge twice, the need that have run many roads back and forth, some place also is difficult to find weight bridge weighing, weighs to truck and causes very big trouble and difficulty, and wasting time and energy increases oil consumption.

(2) the present invention's (tonnage instrument) principle (referring to accompanying drawing one, two, three, four, annotate: only draw among the figure one, two one be set in before the level Four cylinder 3 of sedan-chair center and S. A. jack 16 etc., A among the figure ₁-A ₇And B ₁-B ₇Should link with two

covers

5,3,16 that are loaded on the back sedan-chair respectively.) be that just the neutralizing leaf spring inboard at sedan-chair two ends, back of sedan-chair is installed respectively can carry out S. A. gas control (or hydraulic control) operation in operator's compartment before truck, the pressure oil that is promoted double acting solution-air sundstrand pump (or the oil pump that is driven by truck transmission shaft etc.) output by the truck pressurized air drives, three oil cylinders are carried out finger (or locking), revolution, three LOAD CELLS that the semiautomatic control realization S. A. that flexible (or lifting) waits is weighed and double acting telescopic cylinder of two stages formula hydraulic jack (compound type) assembly, the pressure type LOAD CELLS is housed in each jack, can be around the car sedan-chair by gas (or liquid) control revolution automatically, other disposes a cover semi-automatic operation system and a weight display, three hydraulic jacks rapidly before and after the jack-up car sedan-chair to equal height, make four wheels liftoff rapidly, close pneumatic stopping valve 4(then or make 26 separation), the closing automobile driving engine can be weighed.At this moment three LOAD CELLS pressure summation of bearing equals truck deadweight and loadage summation.By the arithmetical circuit in the weight display three measurement value sensor summations are removed the peel playback greatly, after A/D analogue to digital conversion and Microcomputer Detecting, correction etc. are handled, just goods nt wt net weight digital display in telltale is come out (or printing storage).

The similar vehicle electronics ground weigher of the sensing system of this tonnage instrument, do not rely on the characteristic of the behavior of structure and the member of truck self, be not subjected to the influence of truck structure, do not need to change shape and structure, assembly relation and the matching requirements of the original member of truck, its weighing precision depends primarily on the precision of its sensor and its supporting weight display, is not subjected to the influence of jack inner cylinder pressure and seal friction power.And effective measures in design, have been fully taken into account and have taked, improve weighing precision, architectural feature as part among the figure five 28,29,30,31, especially two hemisphere face structures of SRA, the SRB of the SRA hemisphere face of carrier head and part 30,31 under the LOAD CELLS, and the hemispherical centre of sphere of 30 and 31 SRB is on the intersection point of the axial line of the hemisphere surface of 30 SRA and 30, so just can eliminate because of the ground unfairness 31 the crooked and LOAD CELLS that produces is subjected to eccentric load and the weighting error that causes effectively.In addition as (9) a) described in, can eliminate effectively because the weighting error that the unbalance loading of freighting produces has improved weighing precision significantly.This LOAD CELLS does not stress when not working, and guarantees that its stable performance, life-span are long.This class LOAD CELLS now at home normalisation, seriation produce in enormous quantities, its precision height, stable performance, the life-span is long, price is low.This tonnage instrument is installed, adjusts, operates, keeps in repair all easier on truck, very little to automotive servicing maintenance influence, the crossing ability of truck, safety etc. there is not influence, especially it has to weigh etc. and ten plants unique utility function, and this tonnage instrument structure uniqueness, easy to manufacture, cost is low, being applicable to various types of trucies, is a kind of desirable supporting new product of high-tech truck that can generally apply.

(3) the use operating sequence of this tonnage instrument

Its operating sequence belongs to those skilled in the art can be according in principle of the present invention and the accompanying drawing scope to understand, the Therefore, omited.

(4) chief component of the present invention's tonnage instrument (seeing figure one to figure six), mainly comprise: double acting level Four telescopic cylinder (or oil cylinder) 3, pneumatic stopping valve 4,3 locking indicating device 5, eight tunnel distributions (or oil) valve 6, order distribution (or oil) valve 7, gas automatic control commutation double acting solution-air sundstrand pump 8, oil pump 8 ', fuel tank 9, limiting valve 10, two way selected valve 11, check valve 11 ', four-way change-over valve 12, No. three oil distributing valves 13, pivoted loop assembly 14, sensor connection box 15, two-stage double acting telescopic oil cylinder formula hydraulic jack 16(comprises LOAD CELLS and oil cylinder outside cylinder), wheel is liftoff indicating device 17, jack floor locking indicating device 18, support 19, oil pump shaft X type wheel 20, the outer V-arrangement castle wheel 21 of cliding seat, transmission shaft X-shaped wheel 22, stage clip 25, sliding seat and elastic draw bar assembly 26, leaf spring tire unloading push rod assembly 27, digital weighing telltale 28, (not drawing among 27 figure), (annotate: 23 truck frame the 4th crossbeam, 24 truck tween drive spindles.Figure one is the schematic diagram of pneumatic brake formula truck with the multi-function weighing machine on vehicle instrument, to be oil brake formula trucies be the scheme of installation of the constructional drawing of this

tonnage instrument parts

3,5,16,17,18 etc. and LOAD CELLS, the figure five structure enlarged drawing for the

part

28,29,30,31 in addition in the parts 16 etc. with the schematic diagram of multi-function weighing machine on vehicle instrument, figure four for figure two, figure three, and figure six is the schematic diagram of digital weighing telltale.(also available solenoid directional control valve and slug relay's combination automatic control commutation 8.）

(5) this tonnage instrument second method of weighing:

This method only needs to install at sedan-chair two ends behind the truck two (or only before truck the center of sedan-chair install one) LOAD CELLS hydraulic jack compound type assemblies and weighs or adorn three hydraulic jacks, (annotate :) when wherein having only one of two of back sedan-chairs or preceding sedan-chair that LOAD CELLS is arranged and also can weigh because sensor is somewhat expensive, the voltage signal that sensor is recorded demonstrates nt wt net weight through after certain correction computing, and these methods mainly are that the error that irregular front and back unbalance loading causes is difficult to eliminate.Can be used on the truck to the lower occasion work of the accuracy requirement of weighing.

(6) this tonnage instrument the third method of weighing

This method only needs the S. A. hydraulic fluid jacks of two bands of sedan-chair two ends installation hydraulic pressure sensors behind truck, figure one, the oil outlet pipe branch at gas automatic control commutation double acting solution-air sundstrand pump 8 two ends in two, separately back two hydraulic jacks of sedan-chair are supplied high pressure oil with two cover four-way change-over valves, separately after the jack-up two wheels of sedan-chair liftoff (ground clearance of two wheels is identical) to certain altitude, shutoff valve 4 is closed (must not close 4 in the past) at the big piston of hydraulic jack to the smallest limit position, this moment, two (jack) in-oil cylinder pressure were directly proportional with the load carrying ability that jack is born, can record and the corresponding magnitude of voltage of load carrying ability by hydraulic pressure sensor, demonstrate goods net weight value by telltale through summation correction computing of telltale etc.This method weighting error that the irregular unbalance loading phenomenon on goods (center of gravity is with respect to the railway carriage center) fore-and-aft direction is caused of weighing is difficult to eliminate, and is applicable to the truck that the not too high place of the accuracy requirement of weighing is used.

(7) the trailer first method of weighing:

Truck for the band trailer, weighing of its trailer can be gone up LOAD CELLS hydraulic jack (compound type) assembly (its oil cylinder stroke should be littler) in (2) etc. with one, be loaded on the center of the front axle (or rear axle) of trailer, connect each corresponding gas, oil-piping by figure one, two, just can weigh simultaneously except that tare weight with three LOAD CELLS hydraulic jack assemblies of main car, demonstrate the gross dry weight amount of institute's cargo in main car and the trailer at last by telltale, [see (9) b for details) described].This Weighing method of trailer is very easy, the shortcoming of this method is a commodity distribution inequality in trailer, the weighting error that produces irregular front and back unbalance loading and cause is difficult to eliminate, because trailer railway carriage center and antero posterior axis symmetry, accomplish that unbalance loading is accomplished (unbalance loading is very little before and after perhaps making it, can ignore) than being easier to before and after trailer when loading is not, therefore this Weighing method of trailer is easily practical, and the also comparable main car of the weighing precision of trailer is low.

(8) the trailer second method of weighing

Truck for the band trailer, also can be respectively before trailer, a LOAD CELLS hydraulic jack (compound type) assembly four and five is respectively adorned in the rear axle center, press figure one, two, before the main car 3 of sedan-chair, 5,13,16, each gas of 18, pick out pipeline to two of trailer in the oil pipe line and overlap 3 of parallel connection, 5,13,16, in 18, and from two oil pipes that 12 pick out, meeting a four-way change-over valve D, tell two oil circuits that divide in parallel from two interfaces in addition of D again, and respectively met a two way selected valve E and F in the oil circuit at two minutes, before main car is weighed, manually E is opened in operation earlier, close valve F, allow three LOAD CELLS of sensor four in main car weigh then.After weighing, manually make the D commutation, make on the jack cylinder and contract, close E again, open F, manually make the D commutation again, allow three LOAD CELLS of sensor five in main car weigh.The gross dry weight amount of averaging and being goods in main car and the trailer after removing the peel heavily by weight display to twice value of weighing summation.This method can be eliminated the weighting error that trailer cargo front and back unbalance loading produces, but operation increases by one more and overlaps LOAD CELLS hydraulic jack assembly, a four-way change-over valve and two two way selected valves etc. than trouble.(to two times of amplifications of voltage signal of sensor four, five, the plus-minus back is average more earlier).

(9) principle of digital weighing telltale

A) to the demonstration (shown in accompanying drawing six) of weighing of main car, the feature of its arithmetical circuit is to import the voltage signal that each sensor records at the inverting input of a high-precision op amp, import value signals such as main car deadweight voltage at its in-phase input end, remove the peel heavily computing with this op amp realization summation, output total voltage signal, through A/D A and D converter, memory device, send into processing backs such as 8031 Microcomputer Detecting and gamma correction are shown main car goods by telltale net weight value again.Before weighing at every turn, measure automatically power line voltage and zero point automatic tracking, to overcome the weighting error that produces by power line voltage and influence such as ring temperature etc.In sensor circuit, each sensor of same tonnage instrument is adopted the method that adds semifixed resistor or isolation resistance, make the S/R value equal (or differing very little) of each sensor, so just can eliminate unbalance loading effectively and the weighting error that produces.If desired, can also prepare the miniprinter value of weighing printing and storage at every turn, so as not to mismanagement, goods and materials lose not have midway and demonstrate,prove and can look into.

B) to the main car that has trailer and the demonstration of weighing (shown in figure six) of trailer, when weigh in front axle (or rear axle) center that is loaded on trailer with a LOAD CELLS four hydraulic jack assemblies, when trailer railway carriage loading fore-and-aft direction not during unbalance loading, (or unbalance loading is very little, in the time of can ignoring) load carrying ability that born of this sensor four should be half (comprising the loadage and the deadweight of trailer) of trailer total weight, in the in-phase amplifier in the frame of broken lines of figure six, when two R3 numerical value equate, be two times of amplifiers of homophase, can finish the computing of the voltage on duty two that LOAD CELLS four is measured, import the inverting input of another op amp more simultaneously with each measured voltage signal of three LOAD CELLS of main car, and import the equivalent voltage signal of total deadweight of main car and trailer at its in-phase input end, just can finish heavily computing is removed the peel in the summation of weighing of main car and trailer, again can be after A/D conversion and 8031 MICROCOMPUTER PROCESSING the master, the gross dry weight amount digital display of goods comes out in the trailer.(annotate: the arithmetical circuit of the second method that trailer is weighed omits).

(10) tire and leaf spring unloading protecting, fast S. A. inflation, change tire, repair, save oneself etc. the same (2) described; when extending nearly smallest limit position under three oil cylinders, unclamp 27,27 sagging automatically; operation 6 makes the oil cylinder release, and tire and leaf spring be all unloadings just.Make 13 to go to correspondence position on demand, just arbitrary trailing wheel of jack-up or two front-wheels separately, change tire, repair and save oneself etc. at quick S. A. inflation when carrying out heavy duty.

Claims

1; new mode that a kind of truck weighs and novel tonnage instrument product; it is the multifunctional assembled vehicle electronics tonnage of a kind of S. A. LOAD CELLS hydraulic jack instrument; feature of the present invention is that (main car is generally adorned three several; also can be only adorn two or only adorn one and weigh in preceding sedan-chair center at the back sedan-chair; or on main car, adorn three hydraulic jacks; wherein having only in jack of two of back sedan-chairs or preceding sedan-chair has LOAD CELLS to weigh; when trailer is arranged; adorning one or two on the trailer) LOAD CELLS hydraulic jack (compound type) assembly be movably arranged on respectively before and after on the car sedan-chair (can around the revolution of car sedan-chair); and dispose one and overlap S. A. gas control (or hydraulic control) handling device; double acting solution-air sundstrand pump (or oil pump and driving device thereof); weight display; locking indicating device and tire leaf spring uninstall protection device etc.; LOAD CELLS of the present invention system does not rely on the behavior of structure of truck self and the characteristic of truck component; can not be subjected to the influence of jack inner cylinder pressure and seal friction power etc., and adopt an effective measure eliminated when weighing since the unbalance loading when ground unfairness or loading to the influence of weighing precision.

2, LOAD CELLS hydraulic jack according to claim 1 (compound type) assembly, it is characterized in that hydraulic jack is generally secondary double acting telescopic ram (needs according to different trucies are selected), LOAD CELLS is generally cylinder pressure type resistance-strain LOAD CELLS, its top carrier head by one in (middle part have about in the of one supporting boss face) thru-bolt and the oil cylinder valve piston (screw at center, lower end) link, sensor is contained in (sequence number two words are following to be omitted) in (joining with valve piston lower end screw thread) pilot sleeve sequence number 28, it cooperates is H7/g6, the external diameter of pilot sleeve 28 is identical with the external diameter of valve piston, the sensor lower end is an outer SRA hemisphere face carrier head, link with the interior SRA hemisphere face of supporting base 30 upper ends, the lower end of supporting base is an outer SRB hemisphere face, link with the interior SRB hemisphere face above the jack lower shoe 31, the centre of sphere of the SRB sphere of supporting base and lower shoe must be on the intersection point of the ball of SRA surface and the axial line of supporting base, supporting base is by 29 movable connections of (with pilot sleeve lower end thread connection) swivel nut, and by pilot sleeve 28 and swivel nut 29 guiding, it cooperates is H7/g6, making supporting base 30 can make axial easy on and off slides, by serum cap and two ends respectively with 29,31 extension springs that connect connect, make the lower shoe 31 can be along turning an angle in the SRB face of supporting base 30, the upper end of jack and one is installed on the sedan-chair of truck front and back and can links around the rotating pivoted loop assembly of car sedan-chair, and the outside of jack is a single-acting cylinder.

3, cover S. A. gas control (or hydraulic control) handling device according to claim 1, it is characterized in that comprising the level Four double acting telescopic cylinder (or oil cylinder) 3 that drives the automatic upset of hydraulic jack, pneumatic stopping valve 4, eight tunnel distributions (or joining oil) valve 6, order distribution (or joining oil) valve 7, fuel tank 9, limiting valve 10, two way selected valve 11, four-way change-over valve 12, No. three oil distributing valves 13 etc., but the function of this handling device is semi-automatic operation eight tunnel distributions (or joining oil) valve 6(No. three oil distributing valves 13 locatees earlier on demand), just can finish finger to the locking indicating device of the base plate 31 of the locking indicating device 5 of level Four cylinder 3 and jack 16, locking and indication, automatically flexible (or lifting) of level Four cylinder (or oil cylinder) 3 and oil cylinder outside cylinder, two logical and four-way change-over valves 11,12 automatic reverse, the auto-supply of solution-air sundstrand pump 8 with stop, the automatic revolution of hydraulic jack 16 and lifting etc., and the overall process that each parts coordination of this tonnage instrument is finished like clockwork weigh etc.

4, double acting solution-air sundstrand pump according to claim 1, it is characterized in that being a gas automatic control commutation, solution-air combination expansion power double-action plunger type high pressure pump, and have two cover compound type double check valves to constitute, (also available solenoid directional control valve and slug relay's combination automatic control commutation).

5, oil pump according to claim 1 and driving device thereof, it is characterized in that oil pump be gear type pump or other structures oil pump 8 ', comprise oil pump shaft X-shaped wheel 20, cliding seat V-type castle wheel 21, transmission shaft X type wheel 22, stage clip 25, cliding seat and elastic draw bar assembly 26 in addition, driver's control operating rod 26 in operator's compartment can start (joint) or stop (separation) castle wheel 21, when the tonnage instrument system is not worked, cliding seat V-arrangement castle wheel 21 is under the effect of stage clip 25, automatically separate with 20,22, oil pump is not worked.

6, weight display according to claim 1, it is characterized in that its arithmetical circuit imports the voltage signal that each sensor records at the inverting input of a high-precision op amp, at value signals such as its in-phase input end input truck deadweight voltages, realize summation and remove the peel heavily computing with this op amp, output nt wt net weight voltage signal, again through the A/D analogue to digital conversion send into detect in 8031 microcomputers with processing such as gamma correction after demonstrate nt wt net weight numerical value by telltale, each sensor to same tonnage instrument, employing adds the method for semifixed resistor or isolation resistance, the S/R value of each sensor is equated, when having trailer, trailer can use a sensor four jack assemblies to weigh, the voltage signal that voltage signal after it is weighed records with three sensors of main car after two times of amplifiers of homophase amplify is again together sent into the heavy computing of peeling of suing for peace of another amplifier's inverting input, if two LOAD CELLS jack assemblies have been installed on the trailer weighs, then can be two sensors four, five weigh with three LOAD CELLS of main car respectively, twice value of weighing summation are averaged again.(V ₄, V ₅Two times of amplifications earlier)

7, locking indicating device according to claim 1 is characterized in that comprising stingy (or oil) the cylinder assembly of two kinds of double actings of locking and indication level Four gas (or oil) cylinder and hydraulic jack lower shoe 31 and being installed in the outer liftoff indicating device of wheel of jack.

8, a kind of LOAD CELLS hydraulic jack according to claim 1 (compound type) assembly, it is characterized in that this LOAD CELLS also comprises drum type brake other forms of pressure type LOAD CELLS in addition, as other versions with automatic hydraulic jack combination of the present invention such as sedan-chair formula, two curved posture, pressure resistance type carbon film sensor, sensor can be fixed between jack upper end cover and pivoted loop assembly or be installed in the pilot sleeve 28.

9, LOAD CELLS hydraulic jack according to claim 1 (compound type) assembly, it is characterized in that also available (hydraulic pressure) pressure sensor of this LOAD CELLS and hydraulic jack combination weighing of the present invention, make when weighing in this way, the outlet pipe at its gas automatic control commutation double acting solution-air sundstrand pump 8 two ends separately, separately back two hydraulic jacks of sedan-chair are supplied high pressure oil with two cover four-way change-over valves, separately after the jack-up two wheels of sedan-chair liftoff to equal certain altitude-must be at the big piston of hydraulic jack the pass shutoff valve 4 of holding one's breath in the past to the smallest limit position, make 8 stops control lever, the in-oil cylinder pressure of two hydraulic pressure (jack) this moment is directly proportional with the load carrying ability that jack is born.Can measure and digital display goods nt wt net weight after the processing such as summation correction of telltale by hydraulic pressure sensor.

10, the feature according to claim 1 and 2 described tonnage instrument is that operation 13,27,16 is to correspondence position, just tire and the leaf spring that can realize back sedan-chair (or front and back sedan-chair) all unload, separately arbitrary rear wheel of jack-up or two front vehicle wheels, the quick S. A. when manually jack just can carry out heavy duty are inflated, are changed tire, repair and save oneself etc.