CN103978864B - Hydraulic lifting control system for double-tire lifting bridge - Google Patents
Hydraulic lifting control system for double-tire lifting bridge Download PDFInfo
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- CN103978864B CN103978864B CN201410179929.5A CN201410179929A CN103978864B CN 103978864 B CN103978864 B CN 103978864B CN 201410179929 A CN201410179929 A CN 201410179929A CN 103978864 B CN103978864 B CN 103978864B
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- 230000003028 elevating effect Effects 0.000 claims description 35
- 238000005452 bending Methods 0.000 claims description 17
- 239000002828 fuel tank Substances 0.000 claims description 10
- 239000003921 oil Substances 0.000 description 33
- 238000010586 diagram Methods 0.000 description 6
- 230000007423 decrease Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 239000000725 suspension Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000009428 plumbing Methods 0.000 description 1
- MFOUDYKPLGXPGO-UHFFFAOYSA-N propachlor Chemical compound ClCC(=O)N(C(C)C)C1=CC=CC=C1 MFOUDYKPLGXPGO-UHFFFAOYSA-N 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
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Abstract
A hydraulic lifting control system of a double-tire lifting bridge comprises an oil tank (12), a filter screen (13), a motor (14), an oil pump (15), a one-way valve (16), a reversing valve (17), a one-way throttle valve (18), a lifting oil cylinder (7), an overflow valve (19) and an oil pipe (26), the motor (14) is connected with the oil pump (15), the filter screen (13) is arranged between the oil tank (12) and the oil pump (15), the check valve (16) and the overflow valve (19) are respectively arranged at the outlet of the oil pump (15), the one-way throttle valve (18) is arranged on an oil path of a rod cavity of the lifting oil cylinder (7), a hydraulic load sensing valve (20) is arranged on an oil pipe (26) between the one-way throttle valve (18) and the rodless cavity of the lifting oil cylinder (7), and a valve core (31) of the hydraulic load sensing valve (20) is connected with a connecting rod (23) fixed on the drive axle (3) through a control arm (25). The novel design improves the driving and braking performance of the whole vehicle.
Description
Technical field
The present invention relates to a kind of hydraulic lifting and control system, control system more specifically to a kind of twins lift bridge hydraulic lifting, be used primarily in 6X2 vehicle.
Background technology
Lift bridge, namely refers to the vehicle bridge that can be freely lifted, and tire can be made after lifting to leave ground. Existing lift bridge is the service bridge without driving force mostly. Twins lift bridge vehicle has province's tire, fuel-efficient feature, has good economy, commercially obtains extensive use. Its drive axle and lift bridge axle load are assigned geometric ratio distribution and the preferential both of which of driving force, and braking and driveability impact on vehicle are very big. Under geometric ratio allocation model, the ratio of drive axle and lift bridge axle load is fixed proportion, it is generally about 1.3, owing to drive axle and lift bridge axle load difference are little, drive axle and lift bridge can adopt the brake of same size, the brake force difference of two bridges is little, and when not havinging braking, lift bridge shifts to an earlier date locking and drags sliding phenomenon, is conducive to the performance of braking performance of vehicle; But when smooth road and freight weight are relatively light, drive axle there will be that driving force is not enough and skidding. Under driving force mode of priority, when smooth road and freight weight are relatively light, it is possible to lift bridge part axle load is transferred to drive axle, is conducive to improving vehicular drive capability; But in this case, owing to drive axle and lift bridge axle load difference are relatively big, if adopting the brake of same size, then during braking, lift bridge can shift to an earlier date locking and drags cunning.
Lift bridge forms with lifting mechanism and lifting control system two parts by carrying, and according to the difference of lifting control system, can be divided into pneumatic, hydraulic pressure, several forms such as electronic;Owing to manufacturing the features such as simple, easy to maintenance and advantage of lower cost, the lift bridge of hydraulic control lifting is applied widely. Existing twins lift bridge hydraulic lifting controls system concrete structure referring to Fig. 1, including fuel tank 12, filter screen 13, motor 14, oil pump 15, check valve 16, reversal valve 17, one-way throttle valve 18, elevating ram 7, overflow valve 19; Motor 14 is connected with oil pump 15, and filter screen 13 is arranged between fuel tank 12 and oil pump 15, and check valve 16 and overflow valve 19 are separately positioned on the outlet of oil pump 15, and one-way throttle valve 18 is arranged on the rodless cavity oil circuit of elevating ram 7. In existing twins lift bridge hydraulic lifting system, drive axle is Leaf Spring Suspension, concrete structure is shown in Fig. 2, it is fixed on drive axle 3 by U-bolt in the middle part of leaf spring 2, leaf spring 2 front end is fixed on vehicle frame 11 by fixing end support 1, leaf spring 2 rear end is connected in swing arm 5 by hanger 4, the cylinder rod of elevating ram 7 is connected with rocking arm 9, and pressure arm 8, rocking arm 9 and trip shaft 10 three weld together, and forms switching mechanism; During work, the cylinder rod by controlling elevating ram 7 is flexible, promotes rocking arm 9, trip shaft 10 and pressure arm 8 to move, thus realizing lifting and the decline of lift bridge 6. But, vehicle carry lift bridge 6 land time, in order to protect elevating ram 7, it is fixing geometric ratio allocation model that pressure arm 8 completely disengages from swing arm 5, drive axle 3 and lift bridge 6 axle load, and its ratio size is determined by leaf spring 2 and swing arm 5 size and space arrangement relation; Under this control mode, when smooth road and freight weight are relatively light, easily there is the tyre slip phenomenon that adhesive force is not enough and causes in drive axle.
Summary of the invention
Present invention aims to existing hydraulic control twins lift bridge vehicle easily occur driving hypodynamic problem time relatively light in smooth road and freight weight, it is provided that a kind of twins lift bridge hydraulic lifting controls system.
For achieving the above object, the technical solution of the present invention is: a kind of twins lift bridge hydraulic lifting controls system, including fuel tank, filter screen, motor, oil pump, check valve, reversal valve, one-way throttle valve, elevating ram, overflow valve and oil pipe, described motor is connected with oil pump, described filter screen is arranged between fuel tank and oil pump, described check valve and overflow valve are separately positioned on oil delivery side of pump, described one-way throttle valve is arranged on the rodless cavity oil circuit of elevating ram, between described one-way throttle valve and elevating ram rodless cavity, oil pipe is provided with hydraulic pressure load sensing valve, the spool of described hydraulic pressure load sensing valve is connected with the connecting rod being fixed on drive axle by control arm, also including hydraulic lock, a long-range control check valve of described hydraulic lock is arranged between one-way throttle valve and hydraulic pressure load sensing valve, and another long-range check valve of hydraulic lock is arranged between elevating ram rod chamber and reversal valve, described hydraulic pressure load sensing valve is fixed on vehicle frame by the second support, the spool of hydraulic pressure load sensing valve is connected with control arm one end, the described control arm other end is connected with connecting rod upper end by the first rubber bodies, and described connecting rod lower end is fixed on drive axle by the first support, being provided with the second rubber bodies and bending threaded rod between described connecting rod and the first support, described bending threaded rod one end is connected with the first support, and the bending threaded rod other end is connected with connecting rod lower end by the second rubber bodies, the plane that the axial plane of described bending threaded rod forms with control arm, the first rubber bodies and connecting rod is paralleled when installing in longitudinal direction of car plane.
Compared with prior art, the invention has the beneficial effects as follows:
1, novel in design, improve car load and drive and braking ability.In the present invention, the oil pipe between one-way throttle valve and elevating ram rodless cavity is provided with hydraulic pressure load sensing valve, hydraulic pressure load sensing valve is connected with the connecting rod being fixed on drive axle by control arm, when keeping twins lift bridge carrying structure constant, when smooth road drive axle skids, drive axle and lift bridge axle load is made no longer to distribute by geometric ratio, lift bridge axle load is shifted to drive axle, increases drive axle adhesive force and improve car load driveability; When pavement conditions is better, makes drive axle and lift bridge axle load return to geometric ratio allocation model, improve braking performance of vehicle, so that the present invention has the advantage of geometric ratio distribution and the preferential both of which of driving force concurrently, overcome the deficiencies in the prior art.
2, in the present invention, hydraulic pressure load sensing valve is fixed on vehicle frame by the second support, the spool of hydraulic pressure load sensing valve is connected with control arm one end, the control arm other end is connected with connecting rod upper end by the first rubber bodies, connecting rod lower end is fixed on drive axle by the first support, and between connecting rod and the first support, it is provided with the second rubber bodies and bending threaded rod, bending threaded rod one end is connected with the first support, and the bending threaded rod other end is connected with connecting rod lower end by the second rubber bodies; Height change between vehicle bridge and the vehicle frame that the increase and decrease of drive axle axle load causes is gathered by control arm and connecting rod, the opening and closing of load sensing valve are controlled as input signal, both can guarantee that in axle load transfer process, drive axle will not overload, driving force can have been increased again to greatest extent.
Accompanying drawing explanation
Fig. 1 is existing twins lift bridge hydraulic lifting Control system architecture schematic diagram.
Fig. 2 is the carrying of existing twins lift bridge and lifting mechanism.
Fig. 3 is present configuration schematic diagram.
Fig. 4 is hydraulic pressure load sensing valve mounting structure schematic diagram in the present invention.
Fig. 5 is hydraulic pressure load sensing valve conducting state schematic diagram in the present invention.
Fig. 6 is hydraulic pressure load sensing valve closed mode schematic diagram in the present invention.
Fig. 7 is control arm and the concrete attachment structure schematic diagram of connecting rod in the present invention.
In figure, fixing end support 1, leaf spring 2, drive axle 3, hanger 4, swing arm 5, lift bridge 6, elevating ram 7, pressure arm 8, rocking arm 9, trip shaft 10, vehicle frame 11, fuel tank 12, filter screen 13, motor 14, oil pump 15, check valve 16, reversal valve 17, one-way throttle valve 18, overflow valve 19, hydraulic pressure load sensing valve 20, hydraulic lock 21, first support 22, connecting rod 23, the first rubber bodies 24, control arm 25, oil pipe 26, the second support 27, bending threaded rod 28, the second rubber bodies 29, oil-in 30, spool 31, valve seat 32, oil-out 33.
Detailed description of the invention
Illustrate that the present invention is described in further detail with detailed description of the invention below in conjunction with accompanying drawing.
Referring to Fig. 3-4, a kind of twins lift bridge hydraulic lifting controls system, including fuel tank 12, filter screen 13, motor 14, oil pump 15, check valve 16, reversal valve 17, one-way throttle valve 18, elevating ram 7, overflow valve 19, oil pipe 26 and hydraulic pressure load sensing valve 20; Described motor 14 is connected with oil pump 15, and described filter screen 13 is arranged between fuel tank 12 and oil pump 15, and described check valve 16 and overflow valve 19 are separately positioned on the outlet of oil pump 15, and described one-way throttle valve 18 is arranged on the rodless cavity oil circuit of elevating ram 7. Described hydraulic pressure load sensing valve 20 is arranged on the oil pipe 26 between one-way throttle valve 18 and elevating ram 7 rodless cavity, hydraulic pressure load sensing valve 20 is made up of valve seat 32 and cylindrical spool 31, described spool 31 can rotate in the hole of valve seat 32, being provided with oil-in 30 and oil-out 33 on described valve seat 32, spool 31 is connected with the connecting rod 23 being fixed on drive axle 3 by control arm 25.Preferably, also include hydraulic lock 21, described hydraulic lock 21 is made up of 2 long-range control check valves, and one of them remotely controls check valve and is arranged between one-way throttle valve 18 and hydraulic pressure load sensing valve 20, and another long-range check valve is arranged between elevating ram 7 rod chamber and reversal valve 17. In the present invention, drive axle 3 is Leaf Spring Suspension, is fixed on drive axle 3 by U-bolt in the middle part of leaf spring 2, and leaf spring 2 front end is fixed on vehicle frame 11 by fixing end support 1, and leaf spring 2 rear end is connected in swing arm 5 by hanger 4; The cylinder rod of elevating ram 7 is connected with rocking arm 9; Pressure arm 8, rocking arm 9 and trip shaft 10 three weld together, and form switching mechanism. During work, starting motor 14 and drive oil pump 15 to control system fuel feeding to this hydraulic lifting, the cylinder rod controlling elevating ram 7 by handling reversal valve 17 is stretched, and promotes rocking arm 9, trip shaft 10 and pressure arm 8 to move, thus realizing lifting and the decline of lift bridge 6.
Referring to Fig. 3, when the vehicle is unladen, motor 14 drives oil pump 15 to work, and makes the hydraulic oil in fuel tank 12 inject hydraulic plumbing system through drainage screen 13; Driver control reversal valve 17 makes its left valve position connect, fluid enters elevating ram 7 rodless cavity through one-way throttle valve 18, hydraulic lock 21, hydraulic pressure load sensing valve 20 in the conduction state, elevating ram 7 rod chamber oil return simultaneously, the cylinder rod of elevating ram 7 stretches out promotion switching mechanism work, and then realizes lift bridge 6 and lift. After lift bridge 6 lifting puts in place, driver control reversal valve 17 makes its intermediate valve position enter duty, elevating ram 7 enters, return line cuts off, the cylinder rod stop motion of elevating ram 7, hydraulic lock 21 locking elevating ram 7, avoid reversal valve 17 to bear elevated pressures for a long time and produce the problems such as leakage, make lift bridge 6 lifting be in clamped condition all the time after putting in place, it is to avoid vehicle travel process to produce rock. When the vehicle is fully laden, driver control reversal valve 17 makes its right valve position connect, hydraulic pressure load sensing valve 20 is in the conduction state, fluid enters elevating ram 7 rod chamber through hydraulic lock 21, control elevating ram 7 rod chamber oil-feed, rodless cavity oil return, the cylinder rod retraction of elevating ram 7 drives pressure arm 8 to progressively disengage swing arm 5, release the lifting state of lift bridge 6, lift bridge 6 realizes lower jump area carrying by self gravitation, one-way throttle valve 18 starts to play a role in the process, lift bridge 6 is avoided to accelerate to decline, it is achieved steadily to land; When lift bridge 6 lands carrying, now pressure arm 8 and swing arm 5 completely disengages from, and drive axle 3 and lift bridge 6 axle load are fixing geometric ratio allocation model. When drive axle 3 skids, need lift bridge 6 part axle load is transferred to drive axle 3 to increase adhesive force, now driver control reversal valve 17 makes its left valve position connect, fluid enters elevating ram 7 rodless cavity through one-way throttle valve 18, hydraulic lock 21, hydraulic pressure load sensing valve 20 in the conduction state, elevating ram 7 rod chamber oil return simultaneously, elevating ram 7 cylinder rod stretches out promotion switching mechanism work, and pressure arm 8 and swing arm 5 start to come into contact with and realize lift bridge 6 axle load and reduce, and drive axle 3 load is gradually increased; After drive axle 3 axle load reaches maximum allowable, the right valve position cut-in operation of hydraulic pressure load sensing valve 20, to cut off oil piping system and stop to hydraulic cylinder 7 fuel feeding, the cylinder rod of hydraulic cylinder stops stretching out, and the transfer of lift bridge axle load stops. Reversal valve 17 returns to centre position, and system is entered, oil return line all cuts off fuel feeding in now this hydraulic lifting control, and pressure arm 8 is pressed in swing arm 5, hydraulic lock 21 locking elevating ram 7, it is to avoid reversal valve 17 bears elevated pressures for a long time and produces the problems such as leakage.
Referring to Fig. 4-6, described hydraulic pressure load sensing valve 20 is fixed on vehicle frame 11 by the second support 27, the spool of hydraulic pressure load sensing valve 20 is fixing with control arm 25 one end to be connected, described control arm 25 other end is connected with connecting rod 23 upper end by the first rubber bodies 24, and described connecting rod 23 lower end is fixed on drive axle 3 by the first support 22. When the axle load of lift bridge 6 needs to shift to drive axle 3, along with drive axle 3 axle load increases, leaf spring 2 tends to straight and even counter bends, and the distance h between vehicle frame 11 and drive axle 3 diminishes, hydraulic pressure load sensing valve 20 moves down together along with vehicle frame 11, the control arm 25 valve core rotation with hydrodynamic pressure load sensing valve 20. The size of the valve core rotation angle beta of hydraulic pressure load sensing valve 20 determines that hydraulic pressure load sensing valve 20 opens and closes, particularly as follows: the spool 31 of hydraulic pressure load sensing valve 20 is cylindrical, when spool 31 turns to circular position just to oil-in 30 or oil-out 33, then oil circuit is closed; When spool 31 turns to non-circular position simultaneously just to oil-in 30 and oil-out 33, then oil circuit conducting. Generally, hydraulic pressure load sensing valve 20 is normal open state; In the process that the minimizing of lift bridge 6 axle load, drive axle 3 axle load increase, the spacing h of drive axle 3 and vehicle frame 11 tapers into, after control arm 25 band movable valve plug 31 turns to certain angle, the oil-in 30 of hydraulic pressure load sensing valve 20, oil-out 33 are progressively closed off, the cylinder rod of oil cylinder 7 stops stretching out, and axle load transfer stops.
Referring to Fig. 7, it is provided with the second rubber bodies 29 and bending threaded rod 28 between described connecting rod 23 and the first support 22, described bending threaded rod 28 one end is fixed on the first support 22 by nut, and bending threaded rod 28 other end inserts in the hole of the second rubber bodies 29 and is connected with connecting rod 23 lower end. The axial plane of described bending threaded rod 28 is A2B2C2, the plane A of control arm the 25, first rubber bodies 24 and connecting rod 23 composition1B1C1, described plane A2B2C2With plane A1B1C1In longitudinal direction of car plane install time parallel; During work, the second rubber bodies 29 can around bending threaded rod 28 at lateral direction of car rotation with in surface. Control arm 25 is connected by fastening screw screw bolt and nut and the first rubber bodies 24 and can be rotated around rubber bodies 24, rotates adapting to drive axle in fore-and-aft plane, so that this control system can adapt to automatically, drive axle 3 is forward and backward and the needs of left and right direction play. Between vehicle frame 11 and drive axle 3 during height change, hydraulic pressure load sensing valve 20 can rise or fall, band hydrodynamic pressure load sensing valve 20 valve core rotation, hydraulic pressure load sensing valve 20 oil circuit is opened or closed after turning to certain angle, thus high variable quantity between drive axle 3 and vehicle frame 11 is passed to hydraulic pressure load sensing valve 20 as input signal stabilization, control hydraulic pressure load sensing valve 20 and open and close.
The present invention is by being provided with hydraulic pressure load sensing valve 20 on the oil pipe 26 between one-way throttle valve 18 and elevating ram 7 rodless cavity, when keep twins lift bridge 6 carry structure constant, utilize drive axle 3 axle load to increase and decrease variable quantity between drive axle 3 and the vehicle frame 11 caused and control the opening and closing of hydraulic pressure load sensing valve 20 as input signal, the ratio making drive axle 3 and lift bridge 6 axle load freely switches between geometric ratio distribution and the preferential both of which of driving force, improves car load and drives and braking ability.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, it is impossible to assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, it is also possible to make some simple deduction or replace, said structure all should be considered as belonging to protection scope of the present invention.
Claims (1)
1. a twins lift bridge hydraulic lifting controls system, including fuel tank (12), filter screen (13), motor (14), oil pump (15), check valve (16), reversal valve (17), one-way throttle valve (18), elevating ram (7), overflow valve (19) and oil pipe (26), described motor (14) is connected with oil pump (15), described filter screen (13) is arranged between fuel tank (12) and oil pump (15), described check valve (16) and overflow valve (19) are separately positioned on the outlet of oil pump (15), described one-way throttle valve (18) is arranged on the rodless cavity oil circuit of elevating ram (7), it is characterized in that: between described one-way throttle valve (18) and elevating ram (7) rodless cavity, oil pipe (26) is provided with hydraulic pressure load sensing valve (20), the spool (31) of described hydraulic pressure load sensing valve (20) is connected with the connecting rod (23) being fixed on drive axle (3) by control arm (25), also include hydraulic lock (21), one long-range control check valve of described hydraulic lock (21) is arranged between one-way throttle valve (18) and hydraulic pressure load sensing valve (20), another long-range check valve of hydraulic lock (21) is arranged between elevating ram (7) rod chamber and reversal valve (17), described hydraulic pressure load sensing valve (20) is fixed on vehicle frame (11) by the second support (27), the spool (31) of hydraulic pressure load sensing valve (20) is connected with control arm (25) one end, described control arm (25) other end is connected with connecting rod (23) upper end by the first rubber bodies (24), described connecting rod (23) lower end is fixed on drive axle (3) by the first support (22), the second rubber bodies (29) and bending threaded rod (28) it is provided with between described connecting rod (23) and the first support (22), described bending threaded rod (28) one end is connected with the first support (22), bending threaded rod (28) other end is connected with connecting rod (23) lower end by the second rubber bodies (29), the axial plane of described bending threaded rod (28) and control arm (25), the plane that first rubber bodies (24) and connecting rod (23) form is parallel when installing in longitudinal direction of car plane.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410179929.5A CN103978864B (en) | 2014-04-30 | 2014-04-30 | Hydraulic lifting control system for double-tire lifting bridge |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410179929.5A CN103978864B (en) | 2014-04-30 | 2014-04-30 | Hydraulic lifting control system for double-tire lifting bridge |
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| CN103978864A CN103978864A (en) | 2014-08-13 |
| CN103978864B true CN103978864B (en) | 2016-06-08 |
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| CN201410179929.5A Active CN103978864B (en) | 2014-04-30 | 2014-04-30 | Hydraulic lifting control system for double-tire lifting bridge |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105539394B (en) * | 2015-12-28 | 2018-03-27 | 郑州大学 | The fast stop system of compact car emergency brake |
| CN114670934B (en) * | 2022-04-15 | 2023-08-25 | 山推工程机械股份有限公司 | Vehicle control system and vehicle |
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2014
- 2014-04-30 CN CN201410179929.5A patent/CN103978864B/en active Active
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| US4448132A (en) * | 1981-09-17 | 1984-05-15 | Beatty William T | Convertible railway-highway vehicle |
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