CN102096421A - Electro-hydraulic proportional tension control system of purse line stranding machine based on redundancy fault tolerant control - Google Patents
Electro-hydraulic proportional tension control system of purse line stranding machine based on redundancy fault tolerant control Download PDFInfo
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- CN102096421A CN102096421A CN 201010551768 CN201010551768A CN102096421A CN 102096421 A CN102096421 A CN 102096421A CN 201010551768 CN201010551768 CN 201010551768 CN 201010551768 A CN201010551768 A CN 201010551768A CN 102096421 A CN102096421 A CN 102096421A
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Abstract
The invention discloses an electro-hydraulic proportional tension control system of a purse line stranding machine based on redundancy fault tolerant control, comprising a proportional direction valve (1), a balanced valve (2), a safety valve (3), an overflow valve (4), a first check valve (5-1), a second check valve (5-2), a third check valve (5-3), a fourth check valve (5-4), a first hydraulic motor (6-1), a second hydraulic motor (6-2), a controller (7), a gear case (8), a first pressure sensor (9-1), a second pressure sensor (9-2) and the like, wherein the output shaft of the first hydraulic motor (6-1) and the output shaft of the second hydraulic motor (6-2) are connected with the input end of the gear case (8); the first pressure sensor (9-1) and the second pressure sensor (9-2) are connected with the input terminal of the controller (7), and the output terminal of the controller (7) is connected with electromagnets a1 and b1 of the proportional direction valve (1). The system in the invention can be used for realizing proportional control on the tension of a purse line stranding machine of a purse seine fishing boat under complex working conditions.
Description
Technical field
The present invention relates to a kind of ocean purse seiner winch class fishing gear, relate in particular to a kind of purse seine purse line winch tension control system.
Background technology
When the ocean tuna seine vessel carries out fishing operation, purse line winch need be adjusted the retractable net spee according to operating mode characteristics and job requirements in good time, draw together the suitable tensile force of guiding principle maintenance thereby make, otherwise the sedimentation that may cause netting gear cross make catch reduce slowly or the netting gear sedimentation too fast and make etting with draw together guiding principle and tangle, and finally cause the purse seine failure, also can lead to massive losses such as fishing gear damage, hawser fracture when serious.Therefore, must carry out Tension Control to purse line winch, promote the catching rate of purse seine system and the security and the reliability of fishing operation according to the operating mode characteristics.Because during the purse seiner purse seine fishing of ocean, purse line winch work is frequent, working environment is very abominable, the load behavior complexity, and the netting gear quality is big, fishery harvesting heavy, and this makes that traditional tension closed-loop control method is difficult to carry out more.
The ocean tuna seine vessel is fished for the winch One's name is legion, and hydraulic system adopts constant pressure oil source to concentrate to the performance element fuel feeding, to reduce number of elements, to improve hydraulic system efficient.The Tension Control of purse line winch is fished at purse seine has crucial meaning in the process, and the many feedbacks based on tension signal of traditional Tension Control, the closed-loop control that compares and then realize to draw together guiding principle tension force by the tension value to the tension value gathered and setting.Yet, it is frequent that actual purse seine is fished for work, work under bad environment, it is low only to adopt single tension pick-up to carry out the reliability of Tension Control, in case sensor occurring breaks down and will directly have influence on the stability of closed-loop system, also can cause the irremediable loss of system when serious, simultaneously for some old-fashioned purse seiners, the difficult tension measuring device of installing, make purse seine fishing under the sensor fault situation, still have good control performance even therefore how to develop new control system, simultaneously control hardware cost preferably again has crucial meaning.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of purse seine purse line winch electro-hydraulic proportion tension control system based on redundancy fault-tolerant control, be used to realize the proportional control of purse seiner purse line winch tension force under the complex working condition, and overcome the problem of traditional purse line winch hydraulic system poor reliability under the sensor failure situation, improved the robustness and the reliability of drawing together the guiding principle Tension Control.
In order to solve the problems of the technologies described above, the invention provides a kind of purse seine purse line winch electro-hydraulic proportion tension control system: comprise proportion directional valve, equalizing valve, safety valve, surplus valve, first retaining valve, second retaining valve, the 3rd retaining valve, the 4th retaining valve, first oil motor, second oil motor, controller, gear case, first pressure transducer and second pressure transducer based on redundancy fault-tolerant control;
The oil inlet P of proportion directional valve
1Be communicated with the oil-out A of proportion directional valve with the constant voltage in-line
1Oil-in A with equalizing valve
2Be communicated with the oil-out A of equalizing valve
3Be communicated with the oil-out of safety valve oil inlet P 3, first retaining valve, the oil-in of the 4th retaining valve, the high pressure chest a2 and the second oil motor high pressure chest a3 of first oil motor respectively, the oil inlet P 2 of surplus valve is communicated with the oil-out and the 4th retaining valve oil-out of the 3rd retaining valve respectively; The oil return inlet T of surplus valve
2Oil return inlet T 1 with the first retaining valve oil-in, the second retaining valve oil-in, safety valve oil return inlet T 3 and proportion directional valve is communicated with respectively, and be communicated with oil sump tank pipeline T by scavenge pipe, the oil-out B1 of proportion directional valve is communicated with the low-pressure cavity b2 of first oil motor, the low-pressure cavity b3 of second oil motor, the oil-out of second retaining valve, the oil-in of the 3rd retaining valve and the control port X1 of equalizing valve respectively;
First hydraulic motor output shaft is connected with the gear case input end respectively with second hydraulic motor output shaft, and the gear case output terminal links to each other with purse line winch, the high pressure chest a of first oil motor
2And the high pressure chest a of second oil motor
3Be communicated with the low-pressure cavity b of first oil motor with first pressure transducer jointly
2And the low-pressure cavity b of second oil motor
3Be communicated with second pressure transducer jointly; First pressure transducer, second pressure transducer are connected with the controller input end jointly, controller output end respectively with the electromagnet a of proportion directional valve
1And b
1Connect.
Improvement as the purse seine purse line winch electro-hydraulic proportion tension control system based on redundancy fault-tolerant control of the present invention: be used for sensing and be connected with the controller input end with the tension pick-up of drawing together tension force on the guiding principle that purse line winch links to each other.
Tension control system of the present invention generally need be provided with 2 covers when reality is used, wherein a cover is used to control first purse line winch, another set ofly be used to control second purse line winch (as shown in Figure 2, clear for drawing only shown that in Fig. 2 a cover is used to control the tension control system of first purse line winch).The working method unanimity of two cover tension control systems.First purse line winch is connected with an end of drawing together guiding principle, and second purse line winch is connected with the other end of drawing together guiding principle, draws together guiding principle and is connected with netting gear through first pulley, second pulley respectively.
The present invention has following beneficial effect:
(1) pressure signal and the tension signal of the drawing together guiding principle valve port opening of coming real-time resize ratio direction valve of the present invention by gathering oil motor two chambeies, and then realize the closed loop proportional control of purse line winch tension force.
(2) the present invention is reconstructed drawing together guiding principle tension force by the pressure signal that utilizes oil motor two chambeies of gathering, even at pressure transducer or when drawing together the guiding principle tension pick-up and break down, by the accurate control that the control algolithm of controller inside still can realize drawing together guiding principle tension force, significantly improved the reliability of system's control.
(3) the present invention is also applicable to the purse seiner that tension pick-up is not installed, by the reconstruct of pressure signal to tension force, the proportional control of guiding principle tension force is drawn together in realization, and only adopts pressure sensor realizes that the proportional control of tension force has also significantly improved reliability and reduced hardware cost simultaneously.
Description of drawings
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in further detail.
Fig. 1 is the hydraulic principle synoptic diagram of the purse seine purse line winch electro-hydraulic proportion tension control system based on redundancy fault-tolerant control of the present invention;
Fig. 2 is the hydraulic principle synoptic diagram (for drawing clear, only show the described tension control system of a cover Fig. 1 herein) of the actual user mode of Fig. 1;
To be Fig. 2 fish for hydraulic principle synoptic diagram when putting the net operation at purse seine to Fig. 3;
To be Fig. 3 fish for hydraulic principle synoptic diagram when receiving the net operation at purse seine to Fig. 4.
Among the figure: 1. proportion directional valve, 2. equalizing valve, 3. safety valve, 4. surplus valve, 5. retaining valve, 6. oil motor, 7. controller, 8. gear case, 9. pressure transducer, 10. tension pick-up, 11. purse line winch, 12. pulleys, 13. draw together guiding principle, 14. netting gear, 15,16,17,18,19,20,21,22,23,24,25,26 is pipeline.
Embodiment
The oil inlet P 1 of proportion directional valve 1 is communicated with system pressure oil pipe P by pipeline 15, the oil-out A1 of proportion directional valve 1 is communicated with the oil-in A2 of equalizing valve 2, the oil-out A3 of equalizing valve 2 respectively with safety valve 3 oil inlet P 3, the oil-out of the first retaining valve 5-1, the oil-in of the 4th retaining valve 5-4, the high pressure chest a2 of the first oil motor 6-1 and the second oil motor 6-2 high pressure chest a3 are communicated with, the oil inlet P 2 of surplus valve 4 is communicated with the oil-out of the 3rd retaining valve 5-3 and the 4th retaining valve 5-4 oil-out, the oil return inlet T 2 of surplus valve 4 and the first retaining valve 5-1 oil-in, the second retaining valve 5-2 oil-in, the oil return inlet T 1 of safety valve 3 oil return inlet T 3 and proportion directional valve 1 is communicated with, and be communicated with (promptly with oil sump tank pipeline T by scavenge pipe 26, the oil return inlet T 2 of surplus valve 4 respectively with the first retaining valve 5-1 oil-in, the second retaining valve 5-2 oil-in, the oil return inlet T 1 of safety valve 3 oil return inlet T 3 and proportion directional valve 1 is communicated with each other, and unified oil sump tank), the oil-out B1 of proportion directional valve 1 and the low-pressure cavity b2 of the first oil motor 6-1, the low-pressure cavity b3 in addition of the second oil motor 6-2, the oil-out of the second retaining valve 5-2, the control port X1 of the oil-in of the 3rd retaining valve 5-3 and equalizing valve 2 is communicated with.
Tension control system of the present invention need be provided with 2 covers when reality is used, wherein a cover is used to control the first purse line winch 11-1, another set ofly be used to control the second purse line winch 11-2 (as shown in Figure 2, clear for drawing only shown that in Fig. 2 a cover is used to control the tension control system of the first purse line winch 11-1).The working method unanimity of two cover tension control systems is an example with the tension control system that is used to control the first purse line winch 11-1 below, specifically is expressed as follows:
The output shaft of the first oil motor 6-1 is connected with gear case 8 input ends with the second oil motor 6-2 output shaft, and gear case 8 output terminals link to each other with the first purse line winch 11-1, the high pressure chest a of the first oil motor 6-1
2And the high pressure chest a of the second oil motor 6-2
3Be communicated with the low-pressure cavity b of the first oil motor 6-1 with the first pressure transducer 9-1 jointly
2And the low-pressure cavity b of the second oil motor 6-2
3Be communicated with the second pressure transducer 9-2 jointly, the first tension pick-up 10-1 links to each other with the first pulley 12-1, the first pressure transducer 9-1, the second pressure transducer 9-2, the first tension pick-up 10-1 are connected the electromagnet a of controller 7 output terminals and proportion directional valve 1 jointly with controller 7 input ends
1And b
1Connect.Controller 7 also can link to each other with alarm.
In like manner, gear case 8 output terminals of another set of tension control system link to each other with the second purse line winch 11-2.The second tension pick-up 10-2 links to each other with the second pulley 12-2, and the first pressure transducer 9-1 of another set of tension control system, the second pressure transducer 9-2, the second tension pick-up 10-2 are connected with controller 7 input ends of another set of tension control system jointly.
The first purse line winch 11-1 is connected with an end of drawing together guiding principle 13, and the second purse line winch 11-2 is connected with the other end of drawing together guiding principle 13, draws together guiding principle 13 and is connected with netting gear 14 through the first pulley 12-1, the second pulley 12-2 respectively.
During real work of the present invention, be divided into following two kinds of duties:
One, purse seine is fished for when putting the net operation, and the second purse line winch 11-2 does not participate in work under this state, and netting gear 14 is in to be put (as shown in Figure 3) in the net:
First purse line winch 11-1 work, netting gear 14 begins to sink under the action of gravity of the pulling force of canoe and base ring (be a kind of and netting gear 14 with draw together the fishing gear auxiliary that guiding principle 13 links to each other), pulling is simultaneously drawn together guiding principle 13 to moving away from purse line winch 11-1 direction, draw together guiding principle 13 and clockwise rotate the first oil motor 6-1a through pulley 12-1 drive purse line winch 11-1
2The chamber and the second oil motor 6-2a
3Be forced to be high pressure chest, the first oil motor 6-1b
2The chamber and the second oil motor 6-2b
3The chamber is a low-pressure cavity.The first oil motor 6-1a
2The chamber and the second oil motor 6-2a
3The chamber hydraulic oil by the road 20,21,22 and retaining valve 5-4 flow into the oil inlet P of surplus valve 4
2, again from the oil-out T of surplus valve 4
2Flow out; A hydraulic oil part that flows out is 25 oil sump tanks by the road, and another part is divided into following 2 the tunnel: the one road and 18 enters the first oil motor 6-1b by the road behind retaining valve 5-2 and pipeline 17
2The chamber, thus realize to the first oil motor 6-1b
2Chamber (being low-pressure cavity) repairing; Another road enters the second oil motor 6-2b through pipeline 19
3The chamber, thus realize to the second oil motor 6-2b
3(being low-pressure cavity) repairing.
Proportion directional valve 1 is in b at this moment
1The position, proportion directional valve 1 oil inlet P
1With oil-out B
1Be communicated with oil-out A
1And oil return inlet T
1Be communicated with; System pressure oil from Hydraulic Station 15 enters proportion directional valve 1 oil inlet P 1 by the road, flow out from proportion directional valve 1 oil-out B1, outflow pressure oil by the road 16 and pipeline 17 after be divided into following 2 the tunnel: the one road and 18 enter the first oil motor 6-1b by the road
2The chamber, thus realize to the first oil motor 6-1b
2Chamber (being low-pressure cavity) repairing; Another road enters the second oil motor 6-2b through pipeline 19
3The chamber, thus realize to the second oil motor 6-2b
3(being low-pressure cavity) repairing.The first tension pick-up 10-1 detects the first purse line winch 11-1 tension force in real time, and the first pressure transducer 9-1 detects the high pressure chest a of the first oil motor 6-1 in real time
2And the high pressure chest a of the second oil motor 6-2
3Pressure, the second pressure transducer 9-2 detects in real time the first oil motor 6-1b
2The chamber and the second oil motor 6-2b
3The pressure in chamber.Controller 7 is according to detecting tension force and pressure signal, and based on relational expression F=K between pressure and tension force
f(P
a-P
b) (wherein F is for drawing together guiding principle tension force, P to drawing together guiding principle tension force and calculating
a, P
bBe respectively the force value of oil motor high pressure chest and low-pressure cavity, K
fBe scale-up factor, discharge capacity by motor, the decision of parameters such as efficient, the known technology that is set at the industry of this scale-up factor), if the error of the tension value of tension value that calculates and collection within the specific limits, promptly, for example in the scope of the tension value of Cai Jiing=tension value that (1 ± 8%) calculates, then show tension pick-up 10-1 operational excellence, then controller 7 (is the personnel of fishing for according to the situation of the fishing for real time modifying of reality with tension signal of gathering and the tension value of fishing for personnel setting, promptly, the personnel that fish for are according to fishing for the experience gained) do difference operation, and the pid control modules in the operation result via controller 7 are regulated (promptly regulating through ratio/differentiation element) back export.If the difference of the tension value of tension value that calculates and collection surpasses preset range, then looking tension pick-up 10-1 breaks down, in the time of system alarm, and the tension signal that calculates is done difference as the tension value of actual value and setting compare, and the pid control modules in the operation result via controller 7 are regulated back output.This operation result is by resize ratio direction valve 1 valve port opening size, and valve port opening directly influences the pressure in oil motor high and low pressure chamber, and then realizes the proportional control of drawing together guiding principle 13 tension force.
When two, purse line winch was received the net operation, the first purse line winch 11-1 and the second purse line winch 11-2 all participated in work under this state, and netting gear 14 is in to be received in the net (as shown in Figure 4):
1) it is as follows, to be used to control the action of tension control system of the first purse line winch 11-1:
Proportion directional valve 1 is operated in a
1The position, proportion directional valve 1 oil inlet P
1With oil-out A
1Be communicated with oil-out B
1And oil return inlet T
1Be communicated with, system pressure oil 15 enters proportion directional valve 1 oil inlet P by the road
1, from proportion directional valve 1 oil-out A
1Flow out, the pressure oil of outflow flows into equalizing valve 2 oil-in A
2, by-pass valve arrives oil-out A internally
3, oil-out A
3Outflow pressure oil by the road 23 and pipeline 22 after be divided into 2 tunnel: one road 20 first oil motor 6-1a by the road
2Chamber, another road 21 enter the second oil motor 6-2a by the road
3Rotate thereby drive the first purse line winch 11-1 in the chamber, and the first purse line winch 11-1 receives netting gear 14 realization receipts net operations through drawing together guiding principle 13 strands.The first oil motor 6-1b
2Chamber hydraulic oil is 18, the second oil motor 6-2b by the road
3The hydraulic oil in chamber 19 gathers to pipeline 17 by the road, 16 flows into proportion directional valves 1 oil-out B by the road again
1, then from proportion directional valve 1 oil return inlet T
1Flow out, 26 flow back to fuel tank by the road at last.The first tension pick-up 10-1 detects the first purse line winch 11-1 tension force in real time, and the first pressure transducer 9-1 detects the high pressure chest a of the first oil motor 6-1 in real time
2And the high pressure chest a of the second oil motor 6-2
3Pressure, the second pressure transducer 9-2 detects in real time the first oil motor 6-1b
2The chamber and the second oil motor 6-2b
3The pressure in chamber.Controller 7 detects tension force and pressure signal, and based on relational expression F=K between pressure and tension force
f(P
a-P
b) (wherein F is for drawing together guiding principle tension force, P to drawing together guiding principle tension force and calculating
a, P
bBe respectively the force value of oil motor high pressure chest and low-pressure cavity, K
fBe scale-up factor, by the decision of parameters such as the discharge capacity of motor, efficient), if the error of the tension value of tension value that calculates and collection within the specific limits, then show tension pick-up 10-1 operational excellence, then the tension signal of gathering is done difference operation with the tension value of setting, and export after the pid control modules in the operation result via controller 7 are regulated (promptly regulating through ratio/differentiation element).If the difference of the tension value of tension value that calculates and collection surpasses preset range, then looking tension pick-up 10-1 breaks down, in the time of system alarm, and will calculate tension signal and do difference relatively, and the pid control modules in the operation result via controller 7 are regulated back output as the tension value of actual value and setting.This operation result is by resize ratio direction valve 1 valve port opening size, and valve port opening directly influences the pressure in oil motor high and low pressure chamber, and then realizes the proportional control of drawing together guiding principle tension force.
The above-mentioned first purse line winch 11-1 twists receipts by the end through drawing together guiding principle 13 to an end of netting gear 14.
2), the action that is used to control the tension control system of the second purse line winch 11-2 is: the second purse line winch 11-2 twists receipts by the other end through drawing together guiding principle 13 to the other end of netting gear 14.
The second tension pick-up 10-2 detects the second purse line winch 11-2 tension force in real time, and all the other contents are equal to above-mentioned action 1).
What above-mentioned two cover tension control systems were separate controls the second purse line winch 11-2 and the first purse line winch 11-1 separately separately.
Be provided with safety valve 3 in the tension control system, when two kinds of working methods (above-mentioned) hydraulic system maximum pressure when being used to limit the operation of retractable net, when the pressure of the first oil motor 6-1 high pressure chest a2 and the second oil motor 6-2 high pressure chest a3 is higher than safety valve 3 set pressures, safety valve 3 is opened, hydraulic oil 22,23 flows into safety valve 3 oil inlet P 3 by the road from a2 and a3 chamber, and, 24 flow back to fuel tank by the road at last through oil return inlet T 3 outflows.
At last, it is also to be noted that what more than enumerate only is several specific embodiments of the present invention.Obviously, the invention is not restricted to above embodiment, many distortion can also be arranged.All distortion that those of ordinary skill in the art can directly derive or associate from content disclosed by the invention all should be thought protection scope of the present invention.
Claims (2)
1. based on the purse seine purse line winch electro-hydraulic proportion tension control system of redundancy fault-tolerant control, it is characterized in that: comprise proportion directional valve (1), equalizing valve (2), safety valve (3), surplus valve (4), first retaining valve (5-1), second retaining valve (5-2), the 3rd retaining valve (5-3), the 4th retaining valve (5-4), first oil motor (6-1), second oil motor (6-2), controller (7), gear case (8), first pressure transducer (9-1) and second pressure transducer (9-2);
The oil inlet P of proportion directional valve (1)
1Be communicated with the oil-out A of proportion directional valve (1) with constant voltage in-line (15)
1Oil-in A with equalizing valve (2)
2Be communicated with the oil-out A of equalizing valve (2)
3Be communicated with the oil-out of safety valve (3) oil inlet P 3, first retaining valve (5-1), the oil-in of the 4th retaining valve (5-4), the high pressure chest a2 and second oil motor (6-2) the high pressure chest a3 of first oil motor (6-1) respectively, the oil inlet P 2 of surplus valve (4) is communicated with the oil-out and the 4th retaining valve (5-4) oil-out of the 3rd retaining valve (5-3) respectively; The oil return inlet T of surplus valve (4)
2Oil return inlet T 1 with first retaining valve (5-1) oil-in, second retaining valve (5-2) oil-in, safety valve (3) oil return inlet T 3 and proportion directional valve (1) is communicated with respectively, and be communicated with oil sump tank pipeline T by scavenge pipe (26), the oil-out B1 of proportion directional valve (1) is communicated with the low-pressure cavity b2 of first oil motor (6-1), the low-pressure cavity b3 of second oil motor (6-2), the oil-out of second retaining valve (5-2), the oil-in of the 3rd retaining valve (5-3) and the control port X1 of equalizing valve (2) respectively;
The output shaft of first oil motor (6-1) is connected with gear case (8) input end respectively with second oil motor (6-2) output shaft, and gear case (8) output terminal links to each other with purse line winch, the high pressure chest a of first oil motor (6-1)
2And the high pressure chest a of second oil motor (6-2)
3Be communicated with the low-pressure cavity b of first oil motor (6-1) with first pressure transducer (9-1) jointly
2And the low-pressure cavity b of second oil motor (6-2)
3Be communicated with second pressure transducer (9-2) jointly; First pressure transducer (9-1), second pressure transducer (9-2) are connected with controller (7) input end jointly, controller (7) output terminal respectively with the electromagnet a of proportion directional valve (1)
1And b
1Connect.
2. the purse seine purse line winch electro-hydraulic proportion tension control system based on redundancy fault-tolerant control according to claim 1 is characterized in that: the guiding principle (13) of drawing together that is used for that sensing links to each other with purse line winch is gone up the tension pick-up of tension force and is connected with controller (7) input end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010551768 CN102096421A (en) | 2010-11-19 | 2010-11-19 | Electro-hydraulic proportional tension control system of purse line stranding machine based on redundancy fault tolerant control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010551768 CN102096421A (en) | 2010-11-19 | 2010-11-19 | Electro-hydraulic proportional tension control system of purse line stranding machine based on redundancy fault tolerant control |
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| Publication Number | Publication Date |
|---|---|
| CN102096421A true CN102096421A (en) | 2011-06-15 |
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ID=44129547
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010551768 Pending CN102096421A (en) | 2010-11-19 | 2010-11-19 | Electro-hydraulic proportional tension control system of purse line stranding machine based on redundancy fault tolerant control |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105836648A (en) * | 2016-06-07 | 2016-08-10 | 中国水产科学研究院渔业机械仪器研究所 | Fishing boat trawl winch tension control system |
| CN111664135A (en) * | 2020-04-23 | 2020-09-15 | 武汉船用机械有限责任公司 | Hydraulic system of gear rack lifting platform |
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| CN101717052A (en) * | 2009-11-09 | 2010-06-02 | 浙江大学 | Pressure and flow composite controlled electro-hydraulic proportion tension control system for towing winch of trawl |
| CN101871848A (en) * | 2010-04-02 | 2010-10-27 | 浙江大学 | Semi-physical simulation test platform for trawler warp winch |
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| US6481378B1 (en) * | 2000-09-11 | 2002-11-19 | Fishfarm Tech Ltd. | Fish farming system and method |
| CN101403910A (en) * | 2008-10-23 | 2009-04-08 | 浙江海洋学院 | Gravity force type deep water grille box prediction type control method and its special apparatus |
| CN101717052A (en) * | 2009-11-09 | 2010-06-02 | 浙江大学 | Pressure and flow composite controlled electro-hydraulic proportion tension control system for towing winch of trawl |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105836648A (en) * | 2016-06-07 | 2016-08-10 | 中国水产科学研究院渔业机械仪器研究所 | Fishing boat trawl winch tension control system |
| CN105836648B (en) * | 2016-06-07 | 2018-05-08 | 中国水产科学研究院渔业机械仪器研究所 | A kind of fishing boat trawl winch tension control system |
| CN111664135A (en) * | 2020-04-23 | 2020-09-15 | 武汉船用机械有限责任公司 | Hydraulic system of gear rack lifting platform |
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Application publication date: 20110615 |