CN203876526U - Hydraulic lifting control system for double-tire lifting bridge - Google Patents
Hydraulic lifting control system for double-tire lifting bridge Download PDFInfo
- Publication number
- CN203876526U CN203876526U CN201420217812.7U CN201420217812U CN203876526U CN 203876526 U CN203876526 U CN 203876526U CN 201420217812 U CN201420217812 U CN 201420217812U CN 203876526 U CN203876526 U CN 203876526U
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- valve
- oil
- load sensing
- hydraulic
- lift bridge
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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
- 239000000203 mixture Substances 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 3
- 239000003921 oil Substances 0.000 description 43
- 229910000831 Steel Inorganic materials 0.000 description 9
- 239000010959 steel Substances 0.000 description 9
- 230000001141 propulsive effect Effects 0.000 description 7
- 230000007423 decrease Effects 0.000 description 6
- 239000012530 fluid Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 230000007812 deficiency Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 241000272165 Charadriidae Species 0.000 description 1
- 230000009286 beneficial effect 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
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process 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
- 239000000243 solution Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
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- Vehicle Body Suspensions (AREA)
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 utility model relates to a kind of hydraulic lifting control system, relates in particular a kind of twins lift bridge hydraulic lifting control system, is mainly used in 6X2 vehicle.
Background technology
Lift bridge, refer to can free lifting vehicle bridge, after lifting, can make tire built on stilts.Existing lift bridge is the service bridge without propulsive effort mostly.Twins lift bridge vehicle has province's tire, fuel-efficient feature, has good economy, obtains widespread use on market.Its drive axle and lift bridge axle load are assigned geometric ratio and distribute and the preferential two kinds of patterns of propulsive effort, and the braking on vehicle and driveability impact are very large.Under geometric ratio allocation model, the ratio of drive axle and lift bridge axle load is fixed proportion, be generally 1.3 left and right, due to drive axle and lift bridge axle load difference little, drive axle and lift bridge can adopt the drg of same size, the braking force difference of two bridges is little, there will not be when braking lift bridge to shift to an earlier date locking and drag sliding phenomenon, is conducive to the performance of braking performance of vehicle; But in the time that smooth road and handling load weight are relatively light, drive axle there will be propulsive effort deficiency and skidding.Under propulsive effort mode of priority, in the time that smooth road and handling load weight are relatively light, part or all of lift bridge axle load can be transferred to drive axle, be conducive to improve vehicular drive performance; But in this case, due to drive axle and lift bridge axle load difference larger, if adopt the drg of same size, while braking, lift bridge can shift to an earlier date locking and drags cunning.
Lift bridge forms by carrying with lifting mechanism and lifting control system two parts, 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 cost is relatively low, the lift bridge of fluid control lifting is applied widely.Existing twins lift bridge hydraulic lifting control system concrete structure, referring to Fig. 1, comprises fuel tank 12, filter screen 13, motor 14, oil pump 15, check valve 16, change-over valve 17, one-way throttle valve 18, elevating ram 7, by pass 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 by pass 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, steel spring 2 middle parts are fixed on drive axle 3 by U-bolt, steel spring 2 front ends are fixed on vehicle frame 11 by fixed end support 1, steel spring 2 rear ends are connected in swing arm 5 by hanger 4, the cylinder bar of elevating ram 7 is connected with rocking arm 9, pressure arm 8, rocking arm 9 and trip shaft 10 three's weld togethers, composition switching mechanism; When work, stretch by the cylinder bar of controlling elevating ram 7, promote rocking arm 9, trip shaft 10 and pressure arm 8 and move, thereby realize lifting and the decline of lift bridge 6.But in the time that vehicle carrying lift bridge 6 lands, in order to protect elevating ram 7, pressure arm 8 departs from swing arm 5 completely, drive axle 3 and lift bridge 6 axle loads are fixing geometric ratio allocation model, and its ratio size is determined by steel spring 2 and swing arm 5 sizes and space arrangement relation; Under this mode, easily there is the tyre slip phenomenon that adhesive ability is not enough and cause in drive axle in the time that smooth road and handling load weight are relatively light.
Summary of the invention
The purpose of this utility model is easily to occur in the time that smooth road and handling load weight are relatively light for existing fluid control twins lift bridge vehicle driving hypodynamic problem, and a kind of twins lift bridge hydraulic lifting control system is provided.
For achieving the above object, technical solution of the present utility model is: a kind of twins lift bridge hydraulic lifting control system, comprise fuel tank, filter screen, motor, oil pump, check valve, change-over valve, one-way throttle valve, elevating ram, by pass 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 by pass valve are separately positioned on oily 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 pipe link being fixed on drive axle by Control arm.
Also include hydraulic lock, a Long-distance Control check valve of described hydraulic lock is arranged between one-way throttle valve and hydraulic pressure load sensing valve, and another Long-distance Control check valve of hydraulic lock is arranged between elevating ram rod chamber and change-over 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 pipe link upper end by the first rubber bodies, and described pipe link lower end is fixed on drive axle by the first support.
Between described pipe link and the first support, be provided with the second rubber bodies and bending thread rod, described bending thread rod one end is connected with the first support, and the bending thread rod other end is connected with pipe link lower end by the second rubber bodies.
The axis plane of described bending thread rod parallels while installation in longitudinal direction of car plane with the plane of Control arm, the first rubber bodies and pipe link composition.
Compared with prior art, the beneficial effects of the utility model are:
1, modern design, has improved car load and has driven and deceleration and stopping performance.Oil pipe in the utility model 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 pipe link being fixed on drive axle by Control arm, in the situation that keeping twins lift bridge carrying structure constant, in the time that smooth road drive axle skids, drive axle and lift bridge axle load are no longer distributed by geometric ratio, lift bridge axle load is shifted to drive axle, increase drive axle adhesive ability and improve car load driveability; In the time that pavement conditions is better, make drive axle and lift bridge axle load return to geometric ratio allocation model, improve braking performance of vehicle, thereby make the utility model have the advantage of geometric ratio distribution and the preferential two kinds of patterns of propulsive effort concurrently, overcome the deficiencies in the prior art.
2, in the utility model, 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 pipe link upper end by the first rubber bodies, pipe link lower end is fixed on drive axle by the first support, and between pipe link and the first support, be provided with the second rubber bodies and bending thread rod, bending thread rod one end is connected with the first support, and the bending thread rod other end is connected with pipe link lower end by the second rubber bodies; Gather drive axle axle load by Control arm and pipe link and increase and decrease height change between the vehicle bridge that causes and vehicle frame, as the opening and closing of incoming signal control load sensing valve, can ensure that in axle load transfer process, drive axle can not overload, can increase to greatest extent again propulsive effort.
Brief description of the drawings
Fig. 1 is existing twins lift bridge hydraulic lifting control system structural representation.
Fig. 2 is existing twins lift bridge carrying and lifting mechanism.
Fig. 3 is the utility model structural representation.
Fig. 4 is hydraulic pressure load sensing valve mounting structure schematic diagram in the utility model.
Fig. 5 is hydraulic pressure load sensing valve conducting state schematic diagram in the utility model.
Fig. 6 is hydraulic pressure load sensing valve closed condition schematic diagram in the utility model.
Fig. 7 is Control arm and the concrete connection structure schematic diagram of pipe link in the utility model.
In figure, fixed end support 1, steel 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, change-over valve 17, one-way throttle valve 18, by pass valve 19, hydraulic pressure load sensing valve 20, hydraulic lock 21, the first support 22, pipe link 23, the first rubber bodies 24, Control arm 25, oil pipe 26, the second supports 27, bending thread rod 28, the second rubber bodies 29, oil inlet 30, spool 31, valve seat 32, oil outlet 33.
Detailed description of the invention
Below in conjunction with brief description of the drawings and detailed description of the invention, the utility model is described in further detail.
Referring to Fig. 3-4, a kind of twins lift bridge hydraulic lifting control system, comprises fuel tank 12, filter screen 13, motor 14, oil pump 15, check valve 16, change-over valve 17, one-way throttle valve 18, elevating ram 7, by pass 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 by pass 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 cavities, hydraulic pressure load sensing valve 20 is made up of valve seat 32 and columniform spool 31, described spool 31 can rotate in the hole of valve seat 32, on described valve seat 32, be provided with oil inlet 30 and oil outlet 33, spool 31 is connected with the pipe link 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-distance Control check valves, and one of them Long-distance Control check valve 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 chambers and change-over valve 17.In the utility model, drive axle 3 is Leaf Spring Suspension, and steel spring 2 middle parts are fixed on drive axle 3 by U-bolt, and steel spring 2 front ends are fixed on vehicle frame 11 by fixed end support 1, and steel spring 2 rear ends are connected in swing arm 5 by hanger 4; The cylinder bar of elevating ram 7 is connected with rocking arm 9; Pressure arm 8, rocking arm 9 and trip shaft 10 three's weld togethers, composition switching mechanism.When work, starter motor 14 drives oil pump 15 to this hydraulic lifting control system fuel feeding, and the cylinder bar of controlling elevating ram 7 by handling change-over valve 17 stretches, and promotion rocking arm 9, trip shaft 10 and pressure arm 8 move, thereby realizes lifting and the decline of lift bridge 6.
Referring to Fig. 3, in the time that vehicle is unloaded, motor 14 drives oil pump 15 to work, and makes the hydraulic oil process filter screen 13 injection liquid hydraulic pipes in fuel tank 12; Driver control change-over valve 17 is connected its left valve position, fluid is through one-way throttle valve 18, hydraulic lock 21, enter elevating ram 7 rodless cavities in the hydraulic pressure load sensing valve 20 of conducting state, elevating ram 7 rod chamber oil returns simultaneously, the cylinder bar of elevating ram 7 stretches out and promotes switching mechanism work, and then realizes lift bridge 6 liftings.After lift bridge 6 liftings put in place, driver control change-over valve 17 makes its middle valve position enter mode of operation, elevating ram 7 enters, oil return line cuts off, the cylinder bar stop motion of elevating ram 7, hydraulic lock 21 locking elevating rams 7, avoid change-over valve 17 to bear for a long time elevated pressures and produce the problem such as leakages, lift bridge 6 liftings are put in place after all the time in clamped condition, avoid generation in Vehicle Driving Cycle process to rock.When vehicle at full load, driver control change-over valve 17 is connected its right valve position, hydraulic pressure load sensing valve 20 is in conducting state, fluid enters elevating ram 7 rod chambers through hydraulic lock 21, control elevating ram 7 rod chamber oil-feeds, rodless cavity oil return, the cylinder bar retraction of elevating ram 7 drives pressure arm 8 to depart from gradually swing arm 5, remove the lifting state of lift bridge 6, lift bridge 6 is realized lower jump area carrying by self gravitation, in this process, one-way throttle valve 18 starts to play a role, avoid lift bridge 6 to accelerate to decline, realize and steadily landing; In the time that lift bridge 6 lands carrying, now pressure arm 8 departs from completely with swing arm 5, and drive axle 3 and lift bridge 6 axle loads are fixing geometric ratio allocation model.In the time that drive axle 3 skids, part or all of lift bridge 6 axle load need to be transferred to drive axle 3 to increase adhesive ability, now driver control change-over valve 17 is connected its left valve position, fluid is through one-way throttle valve 18, hydraulic lock 21, enter elevating ram 7 rodless cavities in the hydraulic pressure load sensing valve 20 of conducting state, elevating ram 7 rod chamber oil returns simultaneously, elevating ram 7 cylinder bars stretch out the switching mechanism work that promotes, pressure arm 8 starts to contact gradually with swing arm 5 realizes lift bridge 6 axle loads minimizings, and drive axle 3 load increase gradually; When drive axle 3 axle loads reach after maxim allowable, the right valve position cut into operation of hydraulic pressure load sensing valve 20, cuts off oil piping system and stops to hydraulic actuating cylinder 7 fuel feeding, and the cylinder bar of hydraulic actuating cylinder stops stretching out, and lift bridge axle load shifts and stops.Change-over valve 17 is got back to midway location, and now this hydraulic lifting control system is entered, oil return line is all cut off, and pressure arm 8 is pressed in swing arm 5, and hydraulic lock 21 locking elevating rams 7 are avoided change-over valve 17 to bear for a long time elevated pressures and produced 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 31 of hydraulic pressure load sensing valve 20 is fixedly connected with Control arm 25 one end, described Control arm 25 other ends are connected with pipe link 23 upper ends by the first rubber bodies 24, and described pipe link 23 lower ends are fixed on drive axle 3 by the first support 22.In the time that the axle load of lift bridge 6 need to shift to drive axle 3, along with drive axle 3 axle loads increase, steel spring 2 is tending towards straight even anti-bow, and the distance h between vehicle frame 11 and drive axle 3 diminishes, hydraulic pressure load sensing valve 20 is along with vehicle frame 11 moves down together, the valve core rotation of Control arm 25 with hydrodynamic pressure load sensing valve 20.The size of the spool 31 rotational angle β of hydraulic pressure load sensing valve 20 determines 20 opening and closing of hydraulic pressure load sensing valve, is specially: the spool 31 of hydraulic pressure load sensing valve 20 is for cylindrical, and in the time that spool 31 turns to circular position just to oil inlet 30 or oil outlet 33, oil circuit is closed; In the time that spool 31 turns to non-circular position simultaneously just to oil inlet 30 and oil outlet 33, oil circuit conducting.Generally, hydraulic pressure load sensing valve 20 is normal open state; In the process that lift bridge 6 axle loads reduce, drive axle 3 axle loads increase, between drive axle 3 and vehicle frame 11, distance h diminishes gradually, Control arm 25 is with movable valve plug 31 to turn to after certain angle, oil inlet 30, the oil outlet 33 of hydraulic pressure load sensing valve 20 are closed gradually, the cylinder bar of oil cylinder 7 stops stretching out, and axle load shifts and stops.
Referring to Fig. 7, between described pipe link 23 and the first support 22, be provided with the second rubber bodies 29 and bending thread rod 28, described bending thread rod 28 one end are fixed on the first support 22 by nut, and bending thread rod 28 other ends insert in the hole of the second rubber bodies 29 and are connected with pipe link 23 lower ends.The axis plane of described bending thread rod 28 is A
2b
2c
2, the plane A that Control arm 25, the first rubber bodies 24 and pipe link 23 form
1b
1c
1, described plane A
2b
2c
2with plane A
1b
1c
1while installation in longitudinal direction of car plane, parallel; When work, the second rubber bodies 29 can be around bending thread rod 28 at lateral direction of car rotation with in surface.Control arm 25 is connected with the first rubber bodies 24 by fastening screw screw bolt and nut and can rotates around rubber bodies 24, rotates, thereby make this control system can automatically adapt to the needs of the forward and backward and left and right direction play of drive axle 3 to adapt to drive axle in longitudinal plane.Between vehicle frame 11 and drive axle 3 when height change, hydraulic pressure load sensing valve 20 can rise or decline, band hydrodynamic pressure load sensing valve 20 spools 31 rotate, after turning to certain angle, open or close hydraulic pressure load sensing valve 20 oil circuits, between drive axle 3 and vehicle frame 11, high variable quantity stably passes to hydraulic pressure load sensing valve 20 as incoming signal thus, controls 20 opening and closing of hydraulic pressure load sensing valve.
The utility model 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 cavities, keeping twins lift bridge 6 carrying structures constant in the situation that, between the drive axle 3 that utilizes drive axle 3 axle loads to increase and decrease to cause and vehicle frame 11, variable quantity is as the opening and closing of incoming signal control hydraulic pressure load sensing valve 20, make the ratio of drive axle 3 and lift bridge 6 axle loads distribute between the preferential two kinds of patterns of propulsive effort and freely switch in geometric ratio, improved car load and driven and deceleration and stopping performance.
Above content is in conjunction with concrete preferred implementation further detailed description of the utility model, can not assert that concrete enforcement of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field, without departing from the concept of the premise utility, can also make some simple deduction or replace, said structure all should be considered as belonging to protection domain of the present utility model.
Claims (5)
1. a twins lift bridge hydraulic lifting control system, comprise fuel tank (12), filter screen (13), motor (14), oil pump (15), check valve (16), change-over valve (17), one-way throttle valve (18), elevating ram (7), by pass 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 by pass 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 pipe link (23) being fixed on drive axle (3) by Control arm (25).
2. a kind of twins lift bridge hydraulic lifting control system according to claim 1, it is characterized in that: also include hydraulic lock (21), a Long-distance Control check valve of described hydraulic lock (21) is arranged between one-way throttle valve (18) and hydraulic pressure load sensing valve (20), and another Long-distance Control check valve of hydraulic lock (21) is arranged between elevating ram (7) rod chamber and change-over valve (17).
3. a kind of twins lift bridge hydraulic lifting control system according to claim 1 and 2, it is characterized in that: 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 pipe link (23) upper end by the first rubber bodies (24), and described pipe link (23) lower end is fixed on drive axle (3) by the first support (22).
4. a kind of twins lift bridge hydraulic lifting control system according to claim 3, it is characterized in that: between described pipe link (23) and the first support (22), be provided with the second rubber bodies (29) and bending thread rod (28), described bending thread rod (28) one end is connected with the first support (22), and bending thread rod (28) other end is connected with pipe link (23) lower end by the second rubber bodies (29).
5. a kind of twins lift bridge hydraulic lifting control system according to claim 4, is characterized in that: the axis plane of described bending thread rod (28) parallels while installation in longitudinal direction of car plane with the plane of Control arm (25), the first rubber bodies (24) and pipe link (23) composition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420217812.7U CN203876526U (en) | 2014-04-30 | 2014-04-30 | Hydraulic lifting control system for double-tire lifting bridge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420217812.7U CN203876526U (en) | 2014-04-30 | 2014-04-30 | Hydraulic lifting control system for double-tire lifting bridge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203876526U true CN203876526U (en) | 2014-10-15 |
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ID=51677062
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420217812.7U Expired - Lifetime CN203876526U (en) | 2014-04-30 | 2014-04-30 | Hydraulic lifting control system for double-tire lifting bridge |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203876526U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103978864B (en) * | 2014-04-30 | 2016-06-08 | 东风商用车有限公司 | Hydraulic lifting control system for double-tire lifting bridge |
-
2014
- 2014-04-30 CN CN201420217812.7U patent/CN203876526U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103978864B (en) * | 2014-04-30 | 2016-06-08 | 东风商用车有限公司 | Hydraulic lifting control system for double-tire lifting bridge |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20141015 Effective date of abandoning: 20160608 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20141015 Effective date of abandoning: 20160608 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |