CN102807168A - Hydraulic control system of single-cylinder telescoping mechanism of crane and crane - Google Patents
Hydraulic control system of single-cylinder telescoping mechanism of crane and crane Download PDFInfo
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- CN102807168A CN102807168A CN201210286921XA CN201210286921A CN102807168A CN 102807168 A CN102807168 A CN 102807168A CN 201210286921X A CN201210286921X A CN 201210286921XA CN 201210286921 A CN201210286921 A CN 201210286921A CN 102807168 A CN102807168 A CN 102807168A
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Abstract
The invention provides a hydraulic control system of a single-cylinder telescoping mechanism of a crane and the crane, wherein the hydraulic control system comprises a telescoping oil cylinder control oil path, a cylinder pin oil cylinder control oil path and an arm pin oil cylinder control oil path; the telescoping oil cylinder control oil path comprises a first reversing valve, a cartridge valve, a hydraulic control balance valve, a second reversing valve and a third reversing valve; a work oil port B of the first reversing valve is simultaneously communicated with an oil inlet of the second reversing valve and an oil inlet of the hydraulic control balance valve, an oil outlet of the hydraulic control balance valve is communicated with a rodless cavity of the telescoping oil cylinder, a rod cavity of the telescoping oil cylinder is simultaneously connected with a control oil port of the hydraulic control balance valve, an oil outlet of the second reversing valve and an oil port B of the cartridge valve, a control oil port X of the cartridge valve is communicated with a work oil port of the third reversing valve, and an oil port A of the cartridge valve is simultaneously communicated with an oil inlet and an outlet of the third reversing valve and an work oil port A of the first reversing valve. The hydraulic control system can rapidly telescope an arm, in addition, the control logic is relatively simple and has few fault points.
Description
Technical field
The present invention relates to engineering machinery field, particularly a kind of hydraulic control system and hoisting crane of hoisting crane single cylinder telescoping mechanism.
Background technology
Car hosit telescoping mechanism hydraulic efficiency pressure system has following several kinds of forms both at home and abroad at present: single cylinder bolt-type, two-stage telescopic oil cylinder formula, twin-tub rope row's formula and simple single cylinder are telescopic.Wherein, single cylinder bolt-type telescoping mechanism hydraulic control system utilize the switching-over of load-sensitive oil pump feed, electro-hydraulic reversing valve, hydraulic control Proportional Valve-controlled wet goods realize arm pin, cylinder pin on each joint arm alternately switch the flexible successively arm that respectively saves; Complex structure, cost is high, and is stretching when respectively saving arm; The telescopic oil cylinder piston rod needs repeatedly flexible between each joint arm tail; Required time is longer, and hydraulic principle and electrical control logic are complicated, and reliability is relatively low; Telescopic oil cylinder that includes the two-stage piston rod of balance cock control that two-stage telescopic oil cylinder hydraulic control system is made up of three one way sequence valves is realized poor stability; Twin-tub rope discharge opeing control system uses the flexible two joint arms of an oil cylinder and an oil cylinder to cooperate the flexible 345 joint arms of rope row mechanism, complex structure; And simple single cylinder telescoping mechanism hydraulic efficiency pressure system only is applied to four joint arm and following telescoping mechanisms.
Summary of the invention
In view of this, the objective of the invention is to propose a kind of hydraulic control system and hoisting crane of hoisting crane single cylinder telescoping mechanism, its hydraulic control system is simple in structure, and stretching speed is fast, and control logic is simple and reliable.
For achieving the above object, technical scheme of the present invention is achieved in that
On the one hand; The present invention provides a kind of hydraulic control system of hoisting crane single cylinder telescoping mechanism; Comprise the telescopic oil cylinder control oil channel that is used to control telescopic oil cylinder, the cylinder pin oil cylinder control oil channel that is used for control cylinder pin oil cylinder and the arm pin oil cylinder control oil channel that is used for Control arm pin oil cylinder; Said telescopic oil cylinder control oil channel comprises inserted valve, hydraulic control balance cock, second change-over valve and the 3rd change-over valve of first change-over valve, control direction; The actuator port B of said first change-over valve is communicated with the oil inlet of said second change-over valve and the oil inlet of said hydraulic control balance cock simultaneously; The oil outlet of said hydraulic control balance cock is communicated with the rodless cavity of said telescopic oil cylinder; The rod chamber of said telescopic oil cylinder is communicated with the oil outlet of the control port of said hydraulic control balance cock, said second change-over valve and the hydraulic fluid port B of said inserted valve simultaneously; The control port X of said inserted valve is communicated with the actuator port of said the 3rd change-over valve, and the hydraulic fluid port A while of said inserted valve is communicated with the actuator port A of oil inlet, oil outlet and said first change-over valve of said the 3rd change-over valve.
Further; Said cylinder pin oil cylinder control oil channel comprises the 4th change-over valve and first check valve, second check valve and the 3rd check valve; The oil inlet of said first check valve is communicated with the hydraulic fluid port A of the oil outlet of said second check valve, said inserted valve and the actuator port A of said first change-over valve simultaneously; The oil outlet of said first check valve is communicated with the oil inlet of said the 4th change-over valve; The oil inlet of said second check valve is communicated with the oil inlet of said the 3rd check valve and the oil outlet of the 4th change-over valve simultaneously; The oil outlet of said the 3rd check valve is communicated with the oil inlet of the oil inlet of said hydraulic control balance cock, said second change-over valve, the actuator port B of said first change-over valve simultaneously, and the actuator port of said the 4th change-over valve is communicated with the rod chamber of said cylinder pin oil cylinder.
Further; Said arm pin oil cylinder control oil channel comprises the 5th change-over valve and bidirectional hydraulic lock; Two actuator ports of said the 5th change-over valve are communicated with two oil inlets of said bidirectional hydraulic lock respectively, and two oil outlets of said bidirectional hydraulic lock are communicated with the rod chamber and the rodless cavity of said arm pin oil cylinder respectively.
Further; Also comprise first by pass valve; The oil inlet of said first by pass valve is communicated with the hydraulic fluid port B of said inserted valve, and the oil outlet of said first by pass valve is communicated with the hydraulic fluid port A of the actuator port A of said first change-over valve and said inserted valve simultaneously or takes back fuel tank.
Further, also comprise second by pass valve, the oil inlet of said second by pass valve is communicated with the actuator port A of said first change-over valve and the hydraulic fluid port A of said inserted valve simultaneously, and the oil outlet of said second by pass valve takes back fuel tank.
Further, also comprise the 3rd by pass valve, the oil inlet of said the 3rd by pass valve is communicated with the actuator port B of said first change-over valve and the oil inlet of said hydraulic control balance cock simultaneously, and the oil outlet of said the 3rd by pass valve takes back fuel tank.
Further, also include reel, said reel is arranged on the pipeline between said first change-over valve and said inserted valve and the hydraulic control balance cock.
Further, said first change-over valve is the 3-position 4-way electro-hydraulic reversing valve; Said second change-over valve is bi-bit bi-pass Solenoid ball valve or bi-bit bi-pass solenoid directional control valve;
Said the 3rd change-over valve is two-position three way Solenoid ball valve or two-position three way solenoid directional control valve;
Further, said the 4th change-over valve is two-position three way Solenoid ball valve or two-position three way solenoid directional control valve;
Said the 5th change-over valve is 3-position 4-way Solenoid ball valve or 3-position 4-way solenoid directional control valve.
On the other hand, the present invention also provides a kind of hoisting crane with above-mentioned hydraulic control system.
With respect to prior art, the present invention has following advantage:
1, the hydraulic control system of hoisting crane single cylinder telescoping mechanism of the present invention can constitute differential circuit through second change-over valve, can carry out quick stretch, and hydraulic control system control logic of the present invention is simple relatively, and the trouble point is few.
2, first by pass valve of the hydraulic control system of hoisting crane single cylinder telescoping mechanism of the present invention can provide electroless state or electric function to stretch the oil cylinder function under losing efficacy, with convenient for maintaining.
Description of drawings
The accompanying drawing that constitutes a part of the present invention is used to provide further understanding of the present invention, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, does not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the telescopic oil cylinder control oil channel and the cylinder pin oil cylinder control oil channel scheme drawing of hydraulic control system according to the invention;
Fig. 2 is the arm pin oil cylinder control oil channel scheme drawing of hydraulic control system according to the invention.
Description of reference numerals:
1-first change-over valve, 2-reel, 3-hydraulic control balance cock, 4-telescopic oil cylinder, 5-cylinder pin oil cylinder; 6-second change-over valve, 7-inserted valve, 8-the 3rd change-over valve, 9-the 4th change-over valve, 10-first check valve; 11-second check valve, 12-the 3rd check valve, 13-first by pass valve, 14-second by pass valve; 15-the 3rd by pass valve, 16-arm pin oil cylinder, 17-bidirectional hydraulic lock, 18-the 5th change-over valve.
The specific embodiment
Need to prove that under the situation of not conflicting, embodiment and the characteristic among the embodiment among the present invention can make up each other.Below with reference to accompanying drawing and combine embodiment to specify the present invention.
Fig. 1 and Fig. 2 are the relevant drawings of the embodiment of the invention; Shown in figure; The hydraulic control system of the described hoisting crane single cylinder of present embodiment telescoping mechanism comprises telescopic oil cylinder 4 control oil channel that are used to control telescopic oil cylinder 4, is used for cylinder pin oil cylinder 5 control oil channel of control cylinder pin oil cylinder 5 and is used for arm pin oil cylinder 16 control oil channel of Control arm pin oil cylinder 16.
These telescopic oil cylinder 4 control oil channel comprise first change-over valve 1, inserted valve 7, hydraulic control balance cock 3, second change-over valve 6, the 3rd change-over valve 8, first by pass valve 13, second by pass valve 14, the 3rd by pass valve 15 and reel 2; Wherein, First change-over valve 1 is the 3-position 4-way electro-hydraulic reversing valve; Second change-over valve 6 is the bi-bit bi-pass Solenoid ball valve, and the 3rd change-over valve 8 is the two-position three way Solenoid ball valve, and inserted valve 7 is the direction valve assembly;
These cylinder pin oil cylinder 5 control oil channel comprise the 4th change-over valve 9 and three check valves, and said three check valves are respectively first check valve 10, second check valve 11 and the 3rd check valve 12, and wherein, the 4th change-over valve 9 is the two-position three way Solenoid ball valve;
These arm pin oil cylinder 16 control oil channel comprise the 5th change-over valve 18 and a bidirectional hydraulic lock 17, and wherein, said the 5th change-over valve 18 is the 3-position 4-way solenoid directional control valve.
In above-mentioned three control oil channel; The actuator port B of this first change-over valve 1 is communicated with the oil inlet of this second change-over valve 6 and the oil inlet of this hydraulic control balance cock 3 simultaneously; The oil outlet of this hydraulic control balance cock 3 is communicated with the rodless cavity of this telescopic oil cylinder 4; The rod chamber of this telescopic oil cylinder 4 is communicated with the control port of this hydraulic control balance cock 3, the oil outlet of this second change-over valve 6 and the hydraulic fluid port B of this inserted valve 7 simultaneously; The control port X of this inserted valve 7 is communicated with the actuator port of the 3rd change-over valve 8; The hydraulic fluid port A while of this inserted valve 7 is communicated with the actuator port A of oil inlet, oil outlet and this first change-over valve 1 of the 3rd change-over valve 8; The oil inlet of this first by pass valve 13 is communicated with the hydraulic fluid port B of this inserted valve 7; The oil outlet of this first by pass valve 13 is communicated with the actuator port A of this first change-over valve 1 and the hydraulic fluid port A of this inserted valve 7 simultaneously, and the oil inlet of this second by pass valve 14 is communicated with the actuator port A of this first change-over valve 1 and the hydraulic fluid port A of this inserted valve 7 simultaneously, and the oil outlet of this second by pass valve 14 takes back fuel tank; The oil inlet of the 3rd by pass valve 15 is communicated with the actuator port B of this first change-over valve 1 and the oil inlet of this hydraulic control balance cock 3 simultaneously, and the oil outlet of the 3rd by pass valve 15 takes back fuel tank.The oil inlet of this first check valve 10 is communicated with the oil outlet of this second check valve 11, the hydraulic fluid port A of this inserted valve 7 and the actuator port A of this first change-over valve 1 simultaneously; The oil outlet of this first check valve 10 is communicated with the oil inlet of the 4th change-over valve 9; The oil inlet of this second check valve 11 is communicated with the oil inlet of the 3rd check valve 12 and the oil outlet of the 4th change-over valve 9 simultaneously; The oil outlet of the 3rd check valve 12 is communicated with the oil inlet of this hydraulic control balance cock 3, the oil inlet of this second change-over valve 6, the actuator port B of this first change-over valve 1 simultaneously, and the actuator port of the 4th change-over valve 9 is communicated with the rod chamber of this cylinder pin oil cylinder 5.Two actuator ports of the 5th change-over valve 18 are communicated with two oil inlets of this bidirectional hydraulic lock 17 respectively, and two oil outlets of this bidirectional hydraulic lock 17 are communicated with the rod chamber and the rodless cavity of this arm pin oil cylinder 16 respectively.
Position when making 4 work of tubing length coupling telescopic oil cylinder can also be provided with a tube coiling appts on the pipeline between first change-over valve 1 and inserted valve 7, the hydraulic control balance cock 3.
Specify the control process of the said hydraulic control system of present embodiment below in conjunction with the mode of operation of each electromagnetic valve; For ease of explanation; In the present embodiment, the electromagnet near actuator port B of first change-over valve 1 is labeled as DT17, another is labeled as DT18; The electromagnet of second change-over valve 6 is labeled as DT32; The electromagnet of the 3rd change-over valve 8 is labeled as DT31, the electromagnet of the 4th change-over valve 9 is labeled as DT30, two electromagnet of the 5th change-over valve 18 are labeled as DT28, DT29 respectively.See figures.1.and.2, its concrete control process is following:
1, stretches oil cylinder: the P mouth oil-feed of first change-over valve 1; DT18 opens, and high pressure oil is through the rodless cavity of the check valve entering oil cylinder of actuator port B in reel and hydraulic control balance cock 3 of first change-over valve 1, and the pressure oil of the rod chamber of oil cylinder gets into inserted valve 7; When DT31 gets; The oil of inserted valve 7 upper ends flows back to fuel tank, and inserted valve 7 is opened, and at this moment can carry out general stretch.On this oil circuit, when the DT31 dead electricity, the rod chamber pressure oil gets into inserted valve 7 upper ends closes inserted valve 7, and it is electric that DT32 is got, and is communicated with rod chamber and rodless cavity oil circuit, and then oil cylinder is connected because of differential circuit, can carry out quick stretch.
2, the oil cylinder that contracts: the P mouth oil-feed of first change-over valve 1; DT17 opens; The actuator port A of high pressure oil through first change-over valve 1 gets into inserted valve 7 through reel, this moment the DT31 dead electricity, then inserted valve 7 upper ends do not have pressure oil; Inserted valve 7 is opened; So a part of high pressure oil is opened the flow regulating valve of hydraulic control balance cock 3 left ends as guide oil, and high pressure oil makes the oil of rodless cavity get back to fuel tank through the actuator port B of first change-over valve 1 again through the flow regulating valve in the hydraulic control balance cock 3 after getting into rod chamber simultaneously, makes the oil cylinder arm action of contracting.
3, pull out the cylinder pin: DT17 gets electric, and high pressure oil gets into inserted valve 7 from the actuator port A of first change-over valve 1 through reel, at this moment; If it is electric that DT30 gets, pressure oil pulls pin cylinder pin oil cylinder 5 through first check valve 10, when pulling pin; DT31 gets; Make high pressure oil get into inserted valve 7 upper ends, inserted valve 7 is closed, the arm that stops to contract action.
4, insert the cylinder pin: the DT30 dead electricity, cylinder pin oil cylinder 5 gets into no pressure one side direction fuel tank draining from second check valve 11 and the 3rd check valve 12, and the spring of cylinder pin oil cylinder 5 ejects latch automatically with the cylinder pin.
5, plug arm pin: through control DT28, DT29 electric dead electricity situation, can independent Control arm pin oil cylinder 16 latches or pull pin.
As other embodiments of the foregoing description, the 3rd change-over valve 8, the 4th change-over valve 9 can also be common two-position three way magnetic valve or two-position four-way solenoid valve, and the 5th change-over valve 18 can also be the 3-position 4-way Solenoid ball valve.
Hydraulic control system except above-mentioned hoisting crane single cylinder telescoping mechanism; The present invention also provides a kind of hoisting crane that is provided with the hydraulic control system of above-mentioned mixed hoisting crane single cylinder telescoping mechanism; The structure of other each several part of this hoisting crane is with reference to prior art, and this paper repeats no more.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the hydraulic control system of a hoisting crane single cylinder telescoping mechanism; Comprise the telescopic oil cylinder control oil channel, cylinder pin oil cylinder control oil channel that is used for control cylinder pin oil cylinder (5) and the arm pin oil cylinder control oil channel that is used for Control arm pin oil cylinder (16) that are used to control telescopic oil cylinder (4); It is characterized in that said telescopic oil cylinder control oil channel comprises: inserted valve (7), hydraulic control balance cock (3), second change-over valve (6) and the 3rd change-over valve (8) of first change-over valve (1), control direction;
The actuator port B of said first change-over valve (1) is communicated with the oil inlet of said second change-over valve (6) and the oil inlet of said hydraulic control balance cock (3) simultaneously; The oil outlet of said hydraulic control balance cock (3) is communicated with the rodless cavity of said telescopic oil cylinder (4); The rod chamber of said telescopic oil cylinder (4) is communicated with the control port of said hydraulic control balance cock (3), the oil outlet of said second change-over valve (6) and the hydraulic fluid port B of said inserted valve (7) simultaneously; The control port X of said inserted valve (7) is communicated with the actuator port of said the 3rd change-over valve (8), and the hydraulic fluid port A while of said inserted valve (7) is communicated with the actuator port A of oil inlet, oil outlet and said first change-over valve (1) of said the 3rd change-over valve (8).
2. the hydraulic control system of hoisting crane single cylinder telescoping mechanism according to claim 1; It is characterized in that; Said cylinder pin oil cylinder control oil channel comprises the 4th change-over valve (9) and first check valve (10), second check valve (11) and the 3rd check valve (12); The oil inlet of said first check valve (10) is communicated with the hydraulic fluid port A of the oil outlet of said second check valve (11), said inserted valve (7) and the actuator port A of said first change-over valve (1) simultaneously; The oil outlet of said first check valve (10) is communicated with the oil inlet of said the 4th change-over valve (9); The oil inlet of said second check valve (11) is communicated with the oil inlet of said the 3rd check valve (12) and the oil outlet of the 4th change-over valve (9) simultaneously; The oil outlet of said the 3rd check valve (12) is communicated with the oil inlet of said hydraulic control balance cock (3), the oil inlet of said second change-over valve (6) and the actuator port B of said first change-over valve (1) simultaneously, and the actuator port of said the 4th change-over valve (9) is communicated with the rod chamber of said cylinder pin oil cylinder (5).
3. the hydraulic control system of hoisting crane single cylinder telescoping mechanism according to claim 2; It is characterized in that; Said arm pin oil cylinder control oil channel comprises the 5th change-over valve (18) and bidirectional hydraulic lock (17); Two actuator ports of said the 5th change-over valve (18) are communicated with two oil inlets of said bidirectional hydraulic lock (17) respectively, and two oil outlets of said bidirectional hydraulic lock (17) are communicated with the rod chamber and the rodless cavity of said arm pin oil cylinder (16) respectively.
4. the hydraulic control system of hoisting crane single cylinder telescoping mechanism according to claim 3; It is characterized in that; Also comprise first by pass valve (13); The oil inlet of said first by pass valve (13) is communicated with the hydraulic fluid port B of said inserted valve (7), and the oil outlet of said first by pass valve (13) is communicated with the hydraulic fluid port A of the actuator port A of said first change-over valve (1) and said inserted valve (7) simultaneously or takes back fuel tank.
5. the hydraulic control system of hoisting crane single cylinder telescoping mechanism according to claim 4; It is characterized in that; Also comprise second by pass valve (14); The oil inlet of said second by pass valve (14) is communicated with the actuator port A of said first change-over valve (1) and the hydraulic fluid port A of said inserted valve (7) simultaneously, and the oil outlet of said second by pass valve (14) takes back fuel tank.
6. the hydraulic control system of hoisting crane single cylinder telescoping mechanism according to claim 5; It is characterized in that; Also comprise the 3rd by pass valve (15); The oil inlet of said the 3rd by pass valve (15) is communicated with the actuator port B of said first change-over valve (1) and the oil inlet of said hydraulic control balance cock (3) simultaneously, and the oil outlet of said the 3rd by pass valve (15) takes back fuel tank.
7. the hydraulic control system of hoisting crane single cylinder telescoping mechanism according to claim 1; It is characterized in that; Also include reel (2), said reel (2) is arranged on the pipeline between said first change-over valve (1) and said inserted valve (7) and the hydraulic control balance cock (3).
8. according to the hydraulic control system of any described hoisting crane single cylinder telescoping mechanism of claim 1 to 7, it is characterized in that,
Said first change-over valve (1) is the 3-position 4-way electro-hydraulic reversing valve;
Said second change-over valve (6) is bi-bit bi-pass Solenoid ball valve or bi-bit bi-pass solenoid directional control valve;
Said the 3rd change-over valve (8) is two-position three way Solenoid ball valve or two-position three way solenoid directional control valve.
9. according to the hydraulic control system of any described hoisting crane single cylinder telescoping mechanism of claim 3 to 6, it is characterized in that,
Said the 4th change-over valve (9) is two-position three way Solenoid ball valve or two-position three way solenoid directional control valve;
Said the 5th change-over valve (18) is 3-position 4-way Solenoid ball valve or 3-position 4-way solenoid directional control valve.
10. a hoisting crane is characterized in that, said hoisting crane is provided with the hydraulic control system like any described hoisting crane single cylinder telescoping mechanism of claim 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210286921.XA CN102807168B (en) | 2012-08-13 | 2012-08-13 | Hydraulic control system of single-cylinder telescoping mechanism of crane and crane |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210286921.XA CN102807168B (en) | 2012-08-13 | 2012-08-13 | Hydraulic control system of single-cylinder telescoping mechanism of crane and crane |
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| CN102807168B CN102807168B (en) | 2014-09-10 |
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| CN103030065A (en) * | 2012-12-26 | 2013-04-10 | 三一重工股份有限公司 | Hydraulic locking control system, hydraulic assembly of crane, and crane |
| CN104495624A (en) * | 2014-12-15 | 2015-04-08 | 太原重工股份有限公司 | Super-lift winch lockpin device control system and crane |
| CN104692266A (en) * | 2015-02-05 | 2015-06-10 | 三一汽车起重机械有限公司 | Hydraulic system for telescopic buffer of crane boom and crane |
| CN108457917A (en) * | 2018-04-20 | 2018-08-28 | 武汉船用机械有限责任公司 | A kind of water tightness detection device and its hydraulic system |
| CN108483263A (en) * | 2018-06-25 | 2018-09-04 | 北汽福田汽车股份有限公司 | Hydraulic control valve, hydraulic system and crane |
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| CN103030065A (en) * | 2012-12-26 | 2013-04-10 | 三一重工股份有限公司 | Hydraulic locking control system, hydraulic assembly of crane, and crane |
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| CN108457917A (en) * | 2018-04-20 | 2018-08-28 | 武汉船用机械有限责任公司 | A kind of water tightness detection device and its hydraulic system |
| CN108483263A (en) * | 2018-06-25 | 2018-09-04 | 北汽福田汽车股份有限公司 | Hydraulic control valve, hydraulic system and crane |
| CN108483263B (en) * | 2018-06-25 | 2019-10-22 | 北汽福田汽车股份有限公司 | Hydraulic control valve, hydraulic system and crane |
| CN110905890A (en) * | 2018-09-14 | 2020-03-24 | 湖南双达机电有限责任公司 | Control loop of oil cylinder and continuous pipe injection head tower |
| CN110242229A (en) * | 2019-08-01 | 2019-09-17 | 湖南帅兴机械制造有限公司 | Horizontal drill changes bar auxiliary device |
| CN110242229B (en) * | 2019-08-01 | 2024-02-27 | 湖南迈通智能装备有限公司 | Rod replacing auxiliary device of horizontal drilling machine |
| CN112762032A (en) * | 2021-01-15 | 2021-05-07 | 三一汽车起重机械有限公司 | Telescopic hydraulic system and operation machine |
| CN113417909A (en) * | 2021-08-25 | 2021-09-21 | 湖南十开科技有限公司 | Hydraulic system, emergency guarantee equipment and mutual rescue equipment group |
| CN114412853A (en) * | 2021-12-31 | 2022-04-29 | 徐州重型机械有限公司 | Double-cylinder-head telescopic system and control method |
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| CN102807168B (en) | 2014-09-10 |
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