CN201363332Y - Large inertia variable frequency volume bypass throttling speed governing system - Google Patents
Large inertia variable frequency volume bypass throttling speed governing system Download PDFInfo
- Publication number
- CN201363332Y CN201363332Y CNU2009200359589U CN200920035958U CN201363332Y CN 201363332 Y CN201363332 Y CN 201363332Y CN U2009200359589 U CNU2009200359589 U CN U2009200359589U CN 200920035958 U CN200920035958 U CN 200920035958U CN 201363332 Y CN201363332 Y CN 201363332Y
- Authority
- CN
- China
- Prior art keywords
- valve
- way
- oil
- pump
- speed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000006243 chemical reaction Methods 0.000 claims abstract description 17
- 230000035939 shock Effects 0.000 claims abstract description 8
- 230000001105 regulatory effect Effects 0.000 claims description 16
- 230000002457 bidirectional effect Effects 0.000 claims description 11
- 239000002828 fuel tank Substances 0.000 claims description 10
- 239000000945 filler Substances 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 4
- 239000012530 fluid Substances 0.000 description 9
- 238000006073 displacement reaction Methods 0.000 description 4
- 230000004044 response Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
Images
Landscapes
- Fluid-Pressure Circuits (AREA)
Abstract
A large inertia variable frequency volume bypass throttling speed governing system is suitable for a hydraulic hoisting machine with relatively high requirements on large inertia, high power and startup and shutdown speed control, which comprises a hydraulic volume speed governing circuit, a bypass throttling speed governing circuit, an oil recharging heat interchange circuit and a shock resistance braking circuit. The bypass throttling speed governing is adopted to achieve a relatively good low speed control performance when the system starts and operates at low speed, after the speed reaches a certain degree, the variable frequency volume speed governing is adopted, the frequency converter controls the rotational speed of the frequency conversion motor, then by governing the output flow quantity of the two-way hydraulic pump and driving the hydraulic motor to control the running speed and direction of the loading, so as to achieve the required speed control regularity and the energy saving effect. The oil recharging heat interchange circuit is used in the closed type system to recharge oil and complete the heat interchange. The shock resistance braking circuit is used to release the peak pressure in the main circuit when the driving large inertia loading motor brakes or stops, so as to protect the two-way pump and the hydraulic motor.
Description
Technical field
The utility model relates to a kind of speed control system, and especially a kind of frequency conversion volume by-pass throttle speed control system of big inertia load is applicable to as big inertia such as hydraulic hoisting machine, high-power, occasion that the start and stop speed controlling is had relatively high expectations.
Background technique
For this big inertia of similar hydraulic hoisting machine, large-power hydraulic system, it is started acceleration performance, braking ability and efficient all the higher requirement of ratio.There are very big restriction loss in motion speed and direction that traditional throttle grverning system utilizes throttle valve to come control load, this kind mode of speed regulation, so energy consumption is big, efficient is low, are not suitable for high-power big inertia system.Adopt the Frequency Converter Control variable-frequency motor to drive the frequency conversion volumetric speed control of metering pump, can come the output flow of regulator solution press pump according to the need of work of load, no spill losses and restriction loss, system has higher efficient, has the energy conservation characteristic that general variance pump-control-motor speed control system with adjustable displacement is not had in high-power system.But the high-power metering pump in the frequency conversion speed control system with adjustable displacement all has a minimum regime flow, and is lower in executive component speed, and required flow is during less than the minimum regime flow of oil hydraulic pump, because oil hydraulic pump output flow and pressure instability, thereby the speed controlling poor-performing.Simultaneously for big inertia, high-power hydraulic system, oil hydraulic motor easily takes place to rotate slowly under big inertia load or action of gravity, can produce potential safety hazard, thereby need reliably brake, the anti-again simultaneously locking system phenomenon that caused pressure raises suddenly when braking it.
Summary of the invention
The purpose of this utility model provides a kind of system simple at the problem that prior art exists, and low speed control is reliable, and the throttle grverning response is fast, transmission efficiency height, the big inertia frequency conversion volume by-pass throttle speed control system of saving the energy.
The technical scheme in the invention for solving the technical problem is: it comprises variable-frequency motor, the bidirectional hydraulic pump that links to each other with variable-frequency motor, the bidirectional hydraulic pump links to each other through the two-way hydraulic motor of high low pressure oil circuit with the head roll rotation, be connected with the master cylinder of brake drum on the two-way hydraulic motor, be parallel with the 2/2-way pilot operated directional control valve of two pairs of opposite one-way valve groups of oil circuit direction, 3-position-3-way pilot operated directional control valve and serial connection throttle valve on the high low pressure oil circuit that bidirectional hydraulic pump and two-way hydraulic motor link to each other successively; Be connected with the repairing heat exchange loop on a pair of one-way valve group in the left side, the right company is connected with the safety valve that forms safety protection loop on a pair of one-way valve group, and is connected with the electrohydraulic proportional velocity regulating valve of the formation by-pass throttle flow control circuit that outlet and fuel tank communicate; The control oil channel of 2/2-way pilot operated directional control valve and the oil circuit of master cylinder are provided with the protecting against shock brake circuit; The duplex oil hydraulic pump links to each other by two one-way valves of the filter and the one-way valve group left side, is connected with the relief valve that forms the repairing heat exchange loop on the 3-position-3-way pilot operated directional control valve.
Described repairing heat exchange loop comprises the high-capacity pump in the duplex oil hydraulic pump left side that links to each other with motor, be connected with the relief valve of control oil-supplementing system maximum pressure between high-capacity pump and the one-way valve group oil circuit, high-capacity pump filler opening place is connected with oil purifier, and the oil outlet place is connected with fine filter; Described protecting against shock brake circuit comprises the low-capacity pump on duplex pump right side, and low-capacity pump connects the two-bit triplet solenoid directional control valve of control brake cylinder break-make, is provided with relief valve between low-capacity pump and the two-bit triplet solenoid directional control valve; Be provided with throttle valve between described two-bit triplet solenoid directional control valve and the master cylinder; The low-capacity pump filler opening on described duplex pump right side is connected with filter, and oil outlet is connected with fine filter.
Beneficial effect:
1) flow control circuit is the form that the frequency conversion volumetric speed control combines with electric-hydraulic proportion bypass speed adjusting technique.Because oil hydraulic pump has minimum stable engine speed, when the rotational speed regulation of pump was lower than its minimum stable engine speed, oil hydraulic pump output flow and pressure instability were so the frequency conversion volumetric speed control must could obtain good speed adjusting performance on the minimum stabilized (steady-state) speed of pump.Thereby when low speed start, adopt electrohydraulic proportional velocity regulating valve bypass mode of speed regulation, to realize the effect of low speed control preferably, because the throttle grverning response is fast, improved the low speed speed adjusting performance of oil hydraulic motor simultaneously; After the rotating speed of pump reaches certain value, automatically switch to frequency conversion volumetric speed control mode by control system, thereby this hydraulic speed regulation system has the transmission efficiency height simultaneously, saves characteristics such as the energy, more obvious for the high-power system energy-saving effect.Because major loop adopts closed system, by the Frequency Converter Control variable-frequency motor, the fluid that changes the bidirectional hydraulic pump is exported the sense of rotation that oily direction can change oil hydraulic motor, does not need selector valve and commutation loop can realize commutation, and system is simple.
2) for big inertia system if brake into and out of hydraulic fluid port by the locking oil hydraulic motor separately because the leakage of system, motor can slowly trackslip under the effect of big inertia-gravity load, is difficult to realize braking reliably, thereby is provided with brake circuit in the system.When the motor that drives big inertia load stops or braking; usually can produce high surge pressure in the major loop; though be provided with safety valve in the system; but its response is slower; damage two-way variable displacement pump and oil hydraulic motor in order to prevent too high pressure peak; be connected on the major loop high and low pressure oil circuit with a throttle valve and pilot operated directional control valve, when braking, connect major loop high and low pressure side, to discharge the peak value high pressure in the major loop by throttle valve.
3) be applicable to big inertia, occasion high-power and that start and stop section low-speed performance is had relatively high expectations, as hydraulic hoisting machine.Realization is to the reliable braking of big inertia load.
Description of drawings
Accompanying drawing is a hydraulic schematic diagram of the present utility model.
Among the figure: the 1-frequency variator; The 2-variable-frequency motor; The 3-coupling; 4-bidirectional hydraulic pump; 5-one-way valve group; 6-3-position-3-way pilot operated directional control valve; The 7-throttle valve; 8-2/2-way pilot operated directional control valve; The 9-master cylinder; The 10-two-way hydraulic motor; The 11-cylinder; The 12-throttle valve; 13-two-bit triplet solenoid directional control valve; The 14-relief valve; The 15-electrohydraulic proportional velocity regulating valve; The 16-safety valve; The 17-relief valve; The 18-motor; The 19-duplex pump; 20,22-coarse-grain filtering device; 21,23-fine filter; The 24-relief valve; The 25-fuel tank; The 26-PLC controller.
Embodiment
As shown in drawings, big inertia frequency conversion volume by-pass throttle speed control system of the present utility model, mainly by flow control circuit, safety protection, repairing heat exchange loop and protecting against shock brake circuit four parts constitute, and control with PLC controller 26.Wherein: flow control circuit comprises frequency variator 1, frequency variator 1 control variable-frequency motor 2 drives bidirectional hydraulic pump 4 through coupling 3, bidirectional hydraulic pump 4 drives two-way hydraulic motor 10, two-way hydraulic motor 10 drives cylinder 11 rotations, electrohydraulic proportional velocity regulating valve 15 is connected between one-way valve group 5 and the fuel tank 25, forms the by-pass throttle flow control circuit.Two one-way valve oil outlets on one-way valve group 5 the right link to each other with safety valve 16, the Maximum operating pressure of main oil hydraulic circuit is set up by safety valve 16, thereby make the pressure in 10 liang of chambeies of two-way hydraulic motor be no more than peak, reduced the use amount of safety valve simultaneously, simplified hydraulic system.Safety protection, repairing and heat exchange loop comprise motor 18; motor 18 drives duplex oil hydraulic pump 19; the high-capacity pump in duplex oil hydraulic pump 19 left sides through oil purifier 20 from fuel tank 25 oil suctions; oil outlet is connected with fine filter 21; oil circuit one tunnel is through relief valve 24 oil sump tanks, another road through one-way valve group 5 to the major loop repairing.6 two hydraulic fluid ports of pilot operated directional control valve are connected on respectively on the high and low pressure oil circuit of major loop, and another hydraulic fluid port takes back fuel tank through relief valve 14.Safety valve 16 is connected between one-way valve group 5 and the fuel tank 25.The annexation of each components and parts is as follows in the protecting against shock brake circuit: the little pump in the right side in the duplex pump 19 through filter 22 from fuel tank 25 oil suctions; little pump discharge connects fine filter 23; the one tunnel takes back fuel tank through relief valve 17; the one tunnel connects two-bit triplet solenoid directional control valve 13; two-bit triplet solenoid directional control valve 13 two hydraulic fluid ports one tunnel in addition directly takes back fuel tank; the one tunnel is connected to the hydraulic fluid port of master cylinder 9 through throttle valve 12; throttle valve 7 and 8 series connections of 2/2-way pilot operated directional control valve are at the major loop height; on the low pressure road, and the hydraulic control hydraulic fluid port of 2/2-way pilot operated directional control valve 8 is connected on the oil circuit between master cylinder 9 and the throttle valve 12.
System works principle: when system during at low speed start, frequency variator 1 output control signal works bidirectional hydraulic pump 4 by variable-frequency motor 2, coupling 3 under its minimum stable engine speed, oil hydraulic pump 4 outputs one minimum regime flow, removed by the fluid of oil hydraulic pump 4 output and to enter 10 rotations of two-way hydraulic motor drive motor, the one tunnel through one-way valve group 5, electrohydraulic proportional velocity regulating valve 15 by-pass oil sump tanks in addition.The aperture of electrohydraulic proportional velocity regulating valve 15 is by 26 controls of PLC controller.During startup, the aperture of electrohydraulic proportional velocity regulating valve 15 is transferred to maximum, the fluid of bidirectional hydraulic pump 4 outputs is all through one-way valve group 5, electrohydraulic proportional velocity regulating valve 15 oil sump tanks, thereby motor rotary speed is zero, the aperture of electrohydraulic proportional velocity regulating valve 15 requires to reduce gradually according to the control of system start-up speed then, flow by electrohydraulic proportional velocity regulating valve 15 reduces gradually, the flow that then enters oil hydraulic motor 10 is increasing, motor speed increases gradually, and its accelerating process is controlled by electrohydraulic proportional velocity regulating valve 15 fully.After electrohydraulic proportional velocity regulating valve 15 was closed fully, system's speed governing automatically switched to the frequency conversion volumetric speed control by PLC controller 26.After this, the flow of two-way variable displacement pump 4 outputs all enters oil hydraulic motor 10, the rule running that the rotating speed of motor is set according to frequency variator fully.Thereby realize the compound control that variable frequency hydraulic volumetric speed control and the speed governing of series flow control valve by-pass throttle combine.Owing to be provided with electrohydraulic proportional velocity regulating valve 15, increased the draining passage of system, the impact in the time of can effectively avoiding system start-up because the throttle grverning response is fast, has improved the low speed speed adjusting performance of oil hydraulic motor simultaneously.During system shutdown, as the low cruise speed when stopping higher control requirement is arranged, adopt frequency conversion volumetric speed control mode to allow motor 10 slow down earlier, after reducing to a certain degree, the rotating speed of oil hydraulic pump 4 no longer reduces, but increase the aperture of electrohydraulic proportional velocity regulating valve 15 as requested gradually by PLC controller 26, flow by electrohydraulic proportional velocity regulating valve 15 increases gradually, and the output flow of oil hydraulic pump 4 is constant, to reduce gradually so enter the flow of two-way hydraulic motor 10, motor speed reduces until parking.
Claims (5)
1. one kind big inertia frequency conversion volume by-pass throttle speed control system, it is characterized in that: it comprises variable-frequency motor (2), the bidirectional hydraulic pump (4) that links to each other with variable-frequency motor (2), bidirectional hydraulic pump (4) links to each other through the two-way hydraulic motor (10) of high low pressure oil circuit with head roll (11) rotation, be connected with the master cylinder (9) of brake drum (11) on the two-way hydraulic motor (10), be parallel with the opposite two pairs of one-way valve groups (5) of oil circuit direction successively on the high low pressure oil circuit that bidirectional hydraulic pump (4) and two-way hydraulic motor (10) link to each other, the 2/2-way pilot operated directional control valve (8) of 3-position-3-way pilot operated directional control valve (6) and serial connection throttle valve (7); Be connected with the repairing heat exchange loop on a pair of one-way valve group in the left side (5), be connected with the safety valve (16) that forms safety protection loop on the right a pair of one-way valve group (5), and be connected with the electrohydraulic proportional velocity regulating valve (15) of the formation by-pass throttle flow control circuit that outlet and fuel tank (25) communicate; The oil circuit of the control oil channel of 2/2-way pilot operated directional control valve (8) and master cylinder (9) is provided with the protecting against shock brake circuit; Duplex oil hydraulic pump (19) links to each other by two one-way valves of the filter (21) and one-way valve group (5) left side, is connected with the relief valve (14) that forms the repairing heat exchange loop on the 3-position-3-way pilot operated directional control valve (6).
2. big inertia frequency conversion volume by-pass throttle speed control system according to claim 1, it is characterized in that: described repairing heat exchange loop comprises the high-capacity pump in duplex oil hydraulic pump (19) left side that links to each other with motor (18), be connected with the relief valve (24) of control oil-supplementing system maximum pressure between high-capacity pump and one-way valve group (5) oil circuit, high-capacity pump filler opening place is connected with oil purifier (20), and the oil outlet place is connected with fine filter (21).
3. big inertia frequency conversion volume by-pass throttle speed control system according to claim 1, it is characterized in that: described protecting against shock brake circuit comprises the low-capacity pump on duplex pump (19) right side, low-capacity pump connects the two-bit triplet solenoid directional control valve (13) of control brake cylinder (9) break-make, is provided with relief valve (17) between low-capacity pump and the two-bit triplet solenoid directional control valve (13).
4. big inertia frequency conversion volume by-pass throttle speed control system according to claim 3 is characterized in that: be provided with throttle valve (12) between described two-bit triplet solenoid directional control valve (13) and the master cylinder (9).
5. big inertia frequency conversion volume by-pass throttle speed control system according to claim 3, it is characterized in that: the low-capacity pump filler opening on described duplex pump (19) right side is connected with filter (22), and oil outlet is connected with fine filter (23).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009200359589U CN201363332Y (en) | 2009-03-05 | 2009-03-05 | Large inertia variable frequency volume bypass throttling speed governing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009200359589U CN201363332Y (en) | 2009-03-05 | 2009-03-05 | Large inertia variable frequency volume bypass throttling speed governing system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201363332Y true CN201363332Y (en) | 2009-12-16 |
Family
ID=41473995
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2009200359589U Expired - Fee Related CN201363332Y (en) | 2009-03-05 | 2009-03-05 | Large inertia variable frequency volume bypass throttling speed governing system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201363332Y (en) |
Cited By (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102384120A (en) * | 2011-10-24 | 2012-03-21 | 江苏谷登工程机械装备有限公司 | Volume speed-regulation hydraulic system of unit head of core drill |
| CN103466047A (en) * | 2013-09-02 | 2013-12-25 | 中国船舶重工集团公司第七一〇研究所 | Reciprocating buoyancy regulating unit for autonomous profile buoy platform |
| CN103758805A (en) * | 2013-12-27 | 2014-04-30 | 北京市三一重机有限公司 | Main pushing hydraulic system and tube push bench |
| CN104595290A (en) * | 2014-12-30 | 2015-05-06 | 浙江大学台州研究院 | Hydraulic inerter with initiative and controllable inert coefficient |
| CN103352889B (en) * | 2013-07-08 | 2015-07-01 | 太原理工大学 | Method for buffering hydraulic system shock of crawler loader |
| CN105422094A (en) * | 2015-11-16 | 2016-03-23 | 中国矿业大学 | Direct-drive hydraulic transmission coal mining machine cutting rotary drum height regulating system and method |
| CN105483871A (en) * | 2016-01-26 | 2016-04-13 | 湖州南浔中兴丝织有限公司 | Hot press unit of silk winding and strip forming production device |
| CN105483870A (en) * | 2016-01-26 | 2016-04-13 | 湖州南浔中兴丝织有限公司 | Silk winding mechanical part of silk winding and strip forming production device |
| CN105483869A (en) * | 2016-01-26 | 2016-04-13 | 湖州南浔中兴丝织有限公司 | Silk winding unit of silk winding and strip forming production device |
| CN105525395A (en) * | 2016-01-26 | 2016-04-27 | 湖州南浔中兴丝织有限公司 | Hot pressing mechanism of linen silk winding and strip forming device |
| CN105525394A (en) * | 2016-01-26 | 2016-04-27 | 湖州南浔中兴丝织有限公司 | Winding mechanism of linen silk winding and strip forming device |
| CN105545839A (en) * | 2016-01-29 | 2016-05-04 | 贵阳海之力液压有限公司 | Oil cylinder reversing and volume speed adjusting hydraulic system |
| CN105696121A (en) * | 2016-01-26 | 2016-06-22 | 湖州南浔中兴丝织有限公司 | Production device for coiling silks into strips |
| CN106523453A (en) * | 2016-12-22 | 2017-03-22 | 天津好记科技发展有限公司 | Electromechanical actuator having cavity prevention function |
| CN106762992A (en) * | 2016-12-22 | 2017-05-31 | 天津好记科技发展有限公司 | Electromechanical actuator with pressure holding function |
| CN108397447A (en) * | 2017-12-27 | 2018-08-14 | 中国矿业大学 | A kind of valve-pump joint multi-mode hydraulic control system and its control method |
| CN108547809A (en) * | 2018-06-07 | 2018-09-18 | 北汽福田汽车股份有限公司 | Control system and trucd mixer with it |
| CN108869450A (en) * | 2018-09-12 | 2018-11-23 | 南通润邦重机有限公司 | A kind of low pressure huge discharge variable pump |
| CN110030304A (en) * | 2019-04-22 | 2019-07-19 | 太原理工大学 | A kind of coordinated drive and passive active brake method of large inertia load |
| CN110307193A (en) * | 2019-07-09 | 2019-10-08 | 中国矿业大学 | A kind of large-capacity valve-pump jointly controls emulsion power pack and its control method |
| CN110469551A (en) * | 2019-08-26 | 2019-11-19 | 北京航天发射技术研究所 | A kind of filling hydraulic system based on ratio bypass speed regulating control |
| CN110778552A (en) * | 2019-09-30 | 2020-02-11 | 长沙中联重科环境产业有限公司 | Closed hydraulic system, exhaust method of closed hydraulic system and washing and sweeping vehicle |
| CN113857248A (en) * | 2021-10-22 | 2021-12-31 | 太原理工大学 | Equipment for controlling warping of bimetal composite board plate shape by utilizing hydraulic speed regulation |
-
2009
- 2009-03-05 CN CNU2009200359589U patent/CN201363332Y/en not_active Expired - Fee Related
Cited By (32)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102384120A (en) * | 2011-10-24 | 2012-03-21 | 江苏谷登工程机械装备有限公司 | Volume speed-regulation hydraulic system of unit head of core drill |
| CN103352889B (en) * | 2013-07-08 | 2015-07-01 | 太原理工大学 | Method for buffering hydraulic system shock of crawler loader |
| CN103466047A (en) * | 2013-09-02 | 2013-12-25 | 中国船舶重工集团公司第七一〇研究所 | Reciprocating buoyancy regulating unit for autonomous profile buoy platform |
| CN103466047B (en) * | 2013-09-02 | 2015-10-21 | 中国船舶重工集团公司第七一〇研究所 | The reciprocating buoyancy regulating device of a kind of self-sustaining profile buoy platform |
| CN103758805A (en) * | 2013-12-27 | 2014-04-30 | 北京市三一重机有限公司 | Main pushing hydraulic system and tube push bench |
| CN103758805B (en) * | 2013-12-27 | 2016-03-23 | 北京市三一重机有限公司 | Main propulsion hydraulic system and push-bench |
| CN104595290A (en) * | 2014-12-30 | 2015-05-06 | 浙江大学台州研究院 | Hydraulic inerter with initiative and controllable inert coefficient |
| CN105422094B (en) * | 2015-11-16 | 2017-12-19 | 中国矿业大学 | A kind of direct drive type hydraulic transmission coal-winning machine cutting drum height-adjusting system and method |
| CN105422094A (en) * | 2015-11-16 | 2016-03-23 | 中国矿业大学 | Direct-drive hydraulic transmission coal mining machine cutting rotary drum height regulating system and method |
| CN105483871A (en) * | 2016-01-26 | 2016-04-13 | 湖州南浔中兴丝织有限公司 | Hot press unit of silk winding and strip forming production device |
| CN105483869A (en) * | 2016-01-26 | 2016-04-13 | 湖州南浔中兴丝织有限公司 | Silk winding unit of silk winding and strip forming production device |
| CN105525395A (en) * | 2016-01-26 | 2016-04-27 | 湖州南浔中兴丝织有限公司 | Hot pressing mechanism of linen silk winding and strip forming device |
| CN105525394A (en) * | 2016-01-26 | 2016-04-27 | 湖州南浔中兴丝织有限公司 | Winding mechanism of linen silk winding and strip forming device |
| CN105696121A (en) * | 2016-01-26 | 2016-06-22 | 湖州南浔中兴丝织有限公司 | Production device for coiling silks into strips |
| CN105483870A (en) * | 2016-01-26 | 2016-04-13 | 湖州南浔中兴丝织有限公司 | Silk winding mechanical part of silk winding and strip forming production device |
| CN105525394B (en) * | 2016-01-26 | 2017-12-01 | 湖州南浔中兴丝织有限公司 | Silk is around the coiling mechanism for being rolled into strip device |
| CN105525395B (en) * | 2016-01-26 | 2017-11-24 | 湖州南浔中兴丝织有限公司 | Flax filament winding is rolled into the hot pressing mechanism of strip device |
| CN105483871B (en) * | 2016-01-26 | 2017-11-24 | 湖州南浔中兴丝织有限公司 | Silk is around the heat-pressure unit for being rolled into bar process units |
| CN105545839A (en) * | 2016-01-29 | 2016-05-04 | 贵阳海之力液压有限公司 | Oil cylinder reversing and volume speed adjusting hydraulic system |
| CN106762992A (en) * | 2016-12-22 | 2017-05-31 | 天津好记科技发展有限公司 | Electromechanical actuator with pressure holding function |
| CN106523453A (en) * | 2016-12-22 | 2017-03-22 | 天津好记科技发展有限公司 | Electromechanical actuator having cavity prevention function |
| CN108397447A (en) * | 2017-12-27 | 2018-08-14 | 中国矿业大学 | A kind of valve-pump joint multi-mode hydraulic control system and its control method |
| CN108397447B (en) * | 2017-12-27 | 2019-10-15 | 中国矿业大学 | A kind of valve-pump joint multi-mode hydraulic control system and its control method |
| CN108547809A (en) * | 2018-06-07 | 2018-09-18 | 北汽福田汽车股份有限公司 | Control system and trucd mixer with it |
| CN108869450A (en) * | 2018-09-12 | 2018-11-23 | 南通润邦重机有限公司 | A kind of low pressure huge discharge variable pump |
| CN110030304A (en) * | 2019-04-22 | 2019-07-19 | 太原理工大学 | A kind of coordinated drive and passive active brake method of large inertia load |
| CN110307193A (en) * | 2019-07-09 | 2019-10-08 | 中国矿业大学 | A kind of large-capacity valve-pump jointly controls emulsion power pack and its control method |
| CN110469551A (en) * | 2019-08-26 | 2019-11-19 | 北京航天发射技术研究所 | A kind of filling hydraulic system based on ratio bypass speed regulating control |
| CN110469551B (en) * | 2019-08-26 | 2021-08-27 | 北京航天发射技术研究所 | Filling hydraulic system based on proportional bypass speed regulation control |
| CN110778552A (en) * | 2019-09-30 | 2020-02-11 | 长沙中联重科环境产业有限公司 | Closed hydraulic system, exhaust method of closed hydraulic system and washing and sweeping vehicle |
| CN110778552B (en) * | 2019-09-30 | 2021-06-01 | 长沙中联重科环境产业有限公司 | Closed hydraulic system, exhaust method of closed hydraulic system and washing and sweeping vehicle |
| CN113857248A (en) * | 2021-10-22 | 2021-12-31 | 太原理工大学 | Equipment for controlling warping of bimetal composite board plate shape by utilizing hydraulic speed regulation |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201363332Y (en) | Large inertia variable frequency volume bypass throttling speed governing system | |
| CN102912823B (en) | Rotary energy saving system of excavator | |
| CN201729610U (en) | Rotary hydraulic system of crane and crane | |
| CN100593646C (en) | Unpowered oil supplied direct drive displacement control electrohydraulic servo- closed type oil source system | |
| CN203868275U (en) | Hydraulic stepless speed change transmission mechanism | |
| CN102588358B (en) | High-performance energy saving type electro-hydraulic servo control oil line | |
| CN107965479B (en) | Quick compensation mechanism of mechanical-hydraulic composite energy and energy-saving electro-hydraulic system | |
| CN103267034A (en) | Load sensitive hydraulic system with compensation valve energy recovery function | |
| CN1439814A (en) | Frequency converter volume variable speed closed hydraulic control systems | |
| CN103807223A (en) | One-hydraulic-motor double-loop control system | |
| CN111649023B (en) | Buffering oil supplementing system and method for electro-hydraulic double-control motor driving rotation system | |
| CN103899724A (en) | Hydraulic stepless speed-change transmission mechanism | |
| CN104929992A (en) | Energy-saving design method for variable-load servo control system | |
| CN102913493A (en) | Hydraulic system capable of independently adjusting speed by adopting two pressure compensators | |
| CN104695852A (en) | Pneumatic multi-motor coal-bed drill with hybrid power device | |
| CN101788052A (en) | Motor driven CVT (continuously variable transmission) electro-hydraulic control system | |
| CN201620891U (en) | Variable frequency closed type hydraulic traction system of shearer | |
| CN1945026B (en) | Active hydraulic energy storage device loop | |
| CN102606550A (en) | Energy-saving hydraulic driving system | |
| WO2024139776A1 (en) | Hydraulic transmission gear box control system with hydraulic braking function | |
| CN203062948U (en) | Hydraulic pilot control system of oil-liquid hybrid power concrete mixer truck | |
| CN109026867A (en) | The energy-saving hydraulic system of large-tonnage storage battery forktruck | |
| CN218882981U (en) | Hydraulic transmission case control system with hydraulic braking function | |
| CN112238845A (en) | Brake valve bank for hydrostatic transmission system of railway engineering machinery vehicle | |
| CN208634147U (en) | A kind of driving motor directly drives the hydraulic energy-saving system of pump control cylinder with differential effect |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091216 Termination date: 20100305 |