CN103470553B - A kind ofly subtract the precession speed limiting device shaking gyro - Google Patents
A kind ofly subtract the precession speed limiting device shaking gyro Download PDFInfo
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- CN103470553B CN103470553B CN201310408708.6A CN201310408708A CN103470553B CN 103470553 B CN103470553 B CN 103470553B CN 201310408708 A CN201310408708 A CN 201310408708A CN 103470553 B CN103470553 B CN 103470553B
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Abstract
The invention discloses and a kind ofly subtract the precession speed limiting device shaking gyro, for controlling the precessional evlocity subtracting the rotor frame shaking gyro, described rotor frame is around a precession axis precession, this precession speed limiting device comprises at least one hydraulic jack and speed limited valve, because boats and ships constantly wave with wave, hydraulic jack is constantly stretched.Because the pipeline of two oil hydraulic circuits formed is unilaterally connected, hydraulic oil always enters from the filler opening of speed limited valve, oil outlet flows out.By regulating the flow of speed limited valve, get final product the movement velocity of control piston assembly, and then control precessional evlocity.The present invention has following beneficial effect: the present invention can carry out speed limit to subtracting the precession of shaking gyro, expand subtract shake gyro effectively subtract the scope of shaking; Structure of the present invention is simple, cheap for manufacturing cost.
Description
Technical field
The invention belongs to stabilizer for reducing ship rocking technical field, be specifically related to a kind ofly subtract the precession arrangements for speed regulation shaking gyro.
Background technique
Subtract and shake gyro and belong to stabilizer for reducing ship rocking, effectively can alleviate ship rolling.Ships and light boats can wave under wave action, wherein maximum with rolling harm.Stabilizer for reducing ship rocking has stabilizer, tank stabilizer, subtracts and shake gyro etc., cuts both ways.Wherein, subtract the major advantage of shaking gyro be anti-rolling effect by the restriction of the ships and light boats speed of a ship or plane, and small volume, be convenient to install, such as, can be attached on the ships and light boats of being on active service (and other stabilizer is difficult to install additional).Subtract and shake gyro primarily of parts formations such as rotor and drive unit, rotor frame, rotor frame precession control gear, installing base frame.Wherein, when ships and light boats produce under wave action wave time, rotor is arranged in rotor frame, around an axis of rotation rotation; Rotor with rotor frame around a precession axis precession.Subtract the moment of reaction shaking and produce when gyro derives from rotor frame precession to the opplied moment that ships and light boats produce, only have when this moment and wave action moment about anti-phase time just can subtract and shake, during about homophase, effect increases and shakes.Out-of-control the subtracting of the precessional evlocity of rotor frame is shaken to gyro and be called that pure passive subtracting shakes gyro, is similar to pure passive tank stabilizer, shakes although can subtract within the scope of design conditions, likely can increase when exceeding design conditions scope and shake.Therefore, need to install precession control gear additional, the precessional evlocity of rotor frame is controlled.Current existing technology mainly uses damper to realize controlling (i.e. brake is also named in speed governing) the precession of rotor frame.Damper is connected with precession axis, and damping function can make precession amplitude reduce, and plays and subtracts the effect of shaking.But adopt the precession arrangements for speed regulation complex structure of damper, cost is higher.
Summary of the invention
In order to overcome the defect existed in prior art, the invention provides the precession speed limiting device that gyro is shaken in simple, with low cost the subtracting of a kind of structure, concrete technological scheme is as follows:
Subtract the precession speed limiting device shaking gyro, for controlling the precessional evlocity subtracting the rotor frame shaking gyro, rotor frame is around a precession axis precession, and this precession speed limiting device comprises the first hydraulic jack and speed limited valve,
The inside of the first hydraulic jack is provided with piston assembly, and piston assembly comprises interconnective piston and piston rod; The interior separation of the first hydraulic jack is the first cylinder chamber and the second cylinder chamber by piston, and wherein, the side that piston connects piston rod is the second cylinder chamber, and the opposite side of piston is the first cylinder chamber; First hydraulic jack is provided with the first oil inlet and outlet and the second oil inlet and outlet, and wherein, the first oil inlet and outlet is by the first cylinder chamber and oil cylinder ft connection, and the second oil inlet and outlet is by the second cylinder chamber and oil cylinder ft connection; Piston rod is connected with a connecting rod, and connecting rod is connected with the precession axis of rotor frame;
Speed limited valve comprises filler opening and oil outlet, and the first oil inlet and outlet unilaterally connected is to filler opening, and oil outlet unilaterally connected, to the second oil inlet and outlet, forms an oil hydraulic circuit; Second oil inlet and outlet unilaterally connected is to filler opening, and oil outlet unilaterally connected, to the first oil inlet and outlet, forms another oil hydraulic circuit;
The inside of speed limited valve is provided with the spool that longitudinal section is Ω type, spool by the inside division of speed limited valve for entering oil pocket and go out oil pocket; The longitudinal section entering oil pocket is inverted U-shaped, and the longitudinal section going out oil pocket is convex; The roof of spool is provided with leakage hole, and the sidewall of spool is provided with valve port, enters in oil pocket and is provided with spring.
As optimized project, this precession speed limiting device also comprises solenoid directional control valve; Solenoid directional control valve comprises the first valve port, the second valve port, the 3rd valve port and the 4th valve port, wherein, first valve port is communicated with the first oil inlet and outlet of the first hydraulic jack, second valve port is communicated with filler opening, 3rd valve port is communicated with the second oil inlet and outlet of the first hydraulic jack, and the 4th valve port is communicated with oil outlet;
Solenoid directional control valve comprises the first mode of operation and the second mode of operation;
When being in the first mode of operation, the first valve port is to the 4th valve port unilaterally connected, and the second valve port, to the 3rd valve port unilaterally connected, forms an oil hydraulic circuit;
When being in the second mode of operation, the 3rd valve port is to the 4th valve port unilaterally connected, and the second valve port, to the first valve port unilaterally connected, forms another oil hydraulic circuit;
When the piston assembly of the first hydraulic jack shrinks, solenoid directional control valve is in the first mode of operation; When the piston assembly of the first hydraulic jack stretches out, solenoid directional control valve is in the second mode of operation.
As optimized project, this precession speed limiting device also comprises second hydraulic jack identical with the first oil cylinder structure of hydraulic; The piston rod of the second hydraulic jack is connected with connecting rod, and the first oil inlet and outlet of the second hydraulic jack is communicated with the 3rd valve port, and the second oil inlet and outlet of the second hydraulic jack is communicated with the second oil inlet and outlet of the first hydraulic jack.
As optimized project, this precession speed limiting device also comprises the first identical one-way valve of structure, the second one-way valve, the 3rd one-way valve and the 4th one-way valve, and the first one-way valve, the second one-way valve, the 3rd one-way valve and the 4th one-way valve are equipped with entrance and exit;
First oil inlet and outlet of the first hydraulic jack is communicated with the entrance of the first one-way valve, the outlet of the first one-way valve is communicated with filler opening, oil outlet is communicated with the entrance of the 4th one-way valve, and the outlet of the 4th one-way valve is communicated with the second oil inlet and outlet of the first hydraulic jack, forms an oil hydraulic circuit;
Second oil inlet and outlet of the first hydraulic jack is communicated with the entrance of the second one-way valve, the outlet of the second one-way valve is communicated with filler opening, oil outlet is communicated with the entrance of the 3rd one-way valve, and the outlet of the 3rd one-way valve is communicated with the first oil inlet and outlet of the first hydraulic jack, forms another oil hydraulic circuit.
Compared with prior art, the present invention has following beneficial effect:
(1) the present invention can carry out speed limit to subtracting the precession of shaking gyro, expand subtract shake gyro effectively subtract the scope of shaking;
(2) structure of the present invention is simple, cheap for manufacturing cost.
Accompanying drawing explanation
The structural representation of Fig. 1 embodiment of the present invention 1;
The structural representation of Fig. 2 embodiment of the present invention 2;
The structural representation of Fig. 3 embodiment of the present invention 3.
In upper figure, sequence number is: 11-first hydraulic jack, 12-second hydraulic jack, 2-connecting rod, 3-hydraulic pipe line, 4-speed limited valve, 41-filler opening, 42-oil outlet, 5-spring, 6-spool, 7-valve port, 8-leakage hole, 9-solenoid directional control valve, 91-first valve port, 92-second valve port, 93-the 3rd valve port, 94-the 4th valve port, 101-first one-way valve, 102-second one-way valve, 103-the 3rd one-way valve, 104-the 4th one-way valve.
Embodiment
The present invention is described in detail by way of example below in conjunction with accompanying drawing.
Embodiment 1:
As shown in Figure 1, subtract the precession speed limiting device shaking gyro, for controlling the precessional evlocity subtracting the rotor frame shaking gyro, rotor frame is around a precession axis precession, this precession speed limiting device comprises the first hydraulic jack 11 and speed limited valve 4, is communicated with between each components and parts by pipeline 3.
The inside of the first hydraulic jack 11 is provided with piston assembly, and piston assembly comprises interconnective piston and piston rod; The interior separation of the first hydraulic jack 11 is the first cylinder chamber and the second cylinder chamber by piston, and wherein, the side that piston connects piston rod is the second cylinder chamber, and the opposite side of piston is the first cylinder chamber; First hydraulic jack 11 is provided with the first oil inlet and outlet and the second oil inlet and outlet, and wherein, the first oil inlet and outlet is by the first cylinder chamber and oil cylinder ft connection, and the second oil inlet and outlet is by the second cylinder chamber and oil cylinder ft connection; Piston rod is connected with a connecting rod 2, and connecting rod 2 is connected with the precession axis of rotor frame.
Speed limited valve 4 comprises filler opening 41 and oil outlet 42, first oil inlet and outlet unilaterally connected to filler opening 41, and oil outlet 42 unilaterally connected, to the second oil inlet and outlet, forms an oil hydraulic circuit; Second oil inlet and outlet unilaterally connected is to filler opening 41, and oil outlet 42 unilaterally connected, to the first oil inlet and outlet, forms another oil hydraulic circuit.
In the present embodiment, the longitudinal section of speed limited valve 4 is rectangular, and the inside of speed limited valve 4 is provided with the spool 6 that longitudinal section is Ω type, and the inside division of speed limited valve 4 for entering oil pocket and going out oil pocket, is entered oil pocket and is communicated with filler opening 41, go out oil pocket and be communicated with oil outlet 42 by spool 6; The longitudinal section entering oil pocket is inverted U-shaped, and the longitudinal section going out oil pocket is convex.The roof of spool 6 is provided with leakage hole 8, and the hydraulic oil entered in oil pocket leaks into out in oil pocket by this leakage hole 8; The sidewall of spool 6 is provided with valve port 7, and when the flow velocity of hydraulic oil reaches default Peak Flow Rate, valve port 7 is closed by the hydraulic power of hydraulic oil.Enter in oil pocket to be equipped with spring 5, one end of spring 5 is connected with the top of speed limited valve 4, and the other end of spring 5 is connected with the end face bottom spool 6, and spring 5, for setting Peak Flow Rate, can reach the effect of limited flow rate by the pre compressed magnitude of adjustment adjustment spring 5.
Unilaterally connected of the present invention realizes by the combination of the components and parts such as solenoid directional control valve or one-way valve, adopts solenoid directional control valve in the present embodiment, but is not limited thereto.
Employing solenoid directional control valve realizes unilaterally connected scheme and is: as shown in Figure 1, precession speed limiting device also comprises solenoid directional control valve 9; Solenoid directional control valve comprises the first valve port 91, second valve port 92, the 3rd valve port 93 and the 4th valve port 94, wherein, first valve port 91 is communicated with the first oil inlet and outlet of the first hydraulic jack 11, second valve port 92 is communicated with filler opening 41,3rd valve port 93 is communicated with the second oil inlet and outlet of the first hydraulic jack 11, and the 4th valve port 94 is communicated with oil outlet 42.
Solenoid directional control valve 9 comprises the first mode of operation and the second mode of operation;
When being in the first mode of operation, the first valve port 91 to the four valve port 94 unilaterally connected, the second valve port 92 to the three valve port 93 unilaterally connected, forms an oil hydraulic circuit;
When being in the second mode of operation, the 3rd valve port 93 to the four valve port 94 unilaterally connected, the second valve port 92 to the first valve port 91 unilaterally connected, forms another oil hydraulic circuit.
When the piston assembly of the first hydraulic jack 11 shrinks, solenoid directional control valve 9 is in the first mode of operation; When the piston assembly of the first hydraulic jack 11 stretches out, solenoid directional control valve 9 is in the second mode of operation.
For the present embodiment, illustrate working principle of the present invention:
When boats and ships wave, subtract shake gyro rotor frame around precession axis precession, precession axis drives piston assembly in the first hydraulic jack 11 to stretch by connecting rod 2.
When piston assembly shrinks, solenoid directional control valve 9 is in the first mode of operation, first cylinder chamber of the first hydraulic jack 11 is shunk, hydraulic oil enters filler opening 41 by the first oil inlet and outlet via solenoid directional control valve 9, the flow velocity of speed limited valve 4 pairs of hydraulic oil controls, hydraulic oil through speed limited valve 4 flows into the second oil inlet and outlet by oil outlet 42 via solenoid directional control valve 9, and the second cylinder chamber expansion of the first hydraulic jack 11, forms an oil hydraulic circuit.
When piston assembly stretches out, solenoid directional control valve 9 is in the second mode of operation, second cylinder chamber of the first hydraulic jack 11 is shunk, hydraulic oil enters filler opening 41 by the second oil inlet and outlet via solenoid directional control valve 9, the flow velocity of speed limited valve 4 pairs of hydraulic oil controls, hydraulic oil through speed limited valve 4 flows into the first oil inlet and outlet by oil outlet 42 via solenoid directional control valve 9, and the first cylinder chamber expansion of the first hydraulic jack 11, forms another oil hydraulic circuit.
Because boats and ships constantly wave with wave, make precession axis drive the piston assembly in the first hydraulic jack 11 constantly to stretch by connecting rod 2, said process moves in circles.Because the pipeline of two oil hydraulic circuits formed is unilaterally connected, hydraulic oil always enters from the filler opening 41 of speed limited valve 4, oil outlet 42 flows out.By regulating the flow of speed limited valve 4, get final product the movement velocity of control piston assembly, and then control precessional evlocity.
The control principle of speed limited valve 4 pairs of hydraulic fluid flow rates is: the Peak Flow Rate of hydraulic oil
by formula
determine, wherein,
for the elasticity coefficient of spring 5,
for the pre compressed magnitude of spring 5,
for the density of mass of hydraulic oil,
for the maximum cross-section area of the spool 6 of speed limited valve 4.When the flow velocity of hydraulic oil reaches
after, the hydraulic power of hydraulic oil will make valve port 7 close, and after this, hydraulic oil flows through from leakage hole 8 in the mode of leaking always.The size of leakage flow is relevant with factors such as the pressure reduction before and after the flow area of leakage hole 8, leakage hole 8.The pre compressed magnitude of spring 5 can assemble front setting at speed limited valve 4, also on speed limited valve 4, regulating handle can be installed, after speed limited valve 4 assembles, by the pre compressed magnitude of regulating handle adjustment spring 5, to reach the object adjusting speed limited valve 4 Peak Flow Rate as required in real time.The effect of this restriction hydraulic oil Peak Flow Rate of speed limited valve 4 is by the stretching speed of restriction hydraulic jack, thus restriction precessional evlocity, make the scope of shaking that effectively subtracts of gyro obtain expansion.
Embodiment 2:
The present invention needs at least one hydraulic jack, can as in Example 1, and only adopt a hydraulic jack, also can increase other hydraulic jacks as required, embodiment 2 is the embodiment of employing two hydraulic jacks.
As shown in Figure 2, the present embodiment is with the difference of embodiment 1: precession speed limiting device also comprises second hydraulic jack 12 identical with the first hydraulic jack 11 structure; The piston rod of the second hydraulic jack 12 is connected with connecting rod 2, and the first oil inlet and outlet of the second hydraulic jack 12 is communicated with the 3rd valve port 93, and the second oil inlet and outlet of the second hydraulic jack 12 is communicated with the second oil inlet and outlet of the first hydraulic jack 11.The present embodiment adopts the advantage of two oil cylinders to be, the design of two oil cylinder is symmetric the radial forces of precession axis bearing, is conducive to improving bearing working life.The other technologies scheme of the present embodiment is all identical with embodiment 1, and working principle is also substantially identical, does not repeat them here.
Embodiment 3:
As previously mentioned, unilaterally connected of the present invention realizes by the combination of the components and parts such as solenoid directional control valve or one-way valve, and the present embodiment is the scheme adopting some one-way valves, but is not limited thereto.
As shown in Figure 3, the present embodiment is with the difference of embodiment 1: precession speed limiting device also comprises the first identical one-way valve 101, second one-way valve 102 of structure, the 3rd one-way valve 103 and the 4th one-way valve 104, first one-way valve 101, second one-way valve 102, the 3rd one-way valve 103 and the 4th one-way valve 104 and is equipped with entrance and exit.
First oil inlet and outlet of the first hydraulic jack 11 is communicated with the entrance of the first one-way valve 101, the outlet of the first one-way valve 101 is communicated with filler opening 41, oil outlet 42 is communicated with the entrance of the 4th one-way valve 104, the outlet of the 4th one-way valve 104 is communicated with the second oil inlet and outlet of the first hydraulic jack 11, forms an oil hydraulic circuit;
Second oil inlet and outlet of the first hydraulic jack 11 is communicated with the entrance of the second one-way valve 102, the outlet of the second one-way valve 102 is communicated with filler opening 41, oil outlet 42 is communicated with the entrance of the 3rd one-way valve 103, the outlet of the 3rd one-way valve 103 is communicated with the first oil inlet and outlet of the first hydraulic jack 11, forms another oil hydraulic circuit.
The other technologies scheme of the present embodiment is all identical with embodiment 1, and working principle is also substantially identical, does not repeat them here.
Several specific embodiments of the application being only above, but the not limited thereto the changes that any person skilled in the art can think of of the application, all should drop in the protection domain of the application.
Claims (4)
1. one kind subtracts the precession speed limiting device shaking gyro, for controlling the precessional evlocity subtracting the rotor frame shaking gyro, described rotor frame, around a precession axis precession, is characterized in that, this precession speed limiting device comprises the first hydraulic jack (11) and speed limited valve (4)
The inside of described first hydraulic jack (11) is provided with piston assembly, and described piston assembly comprises interconnective piston and piston rod; The interior separation of described first hydraulic jack (11) is the first cylinder chamber and the second cylinder chamber by described piston, and wherein, the side that described piston connects described piston rod is the second cylinder chamber, and the opposite side of described piston is the first cylinder chamber; Described first hydraulic jack (11) is provided with the first oil inlet and outlet and the second oil inlet and outlet, and wherein, described first oil inlet and outlet is by described first cylinder chamber and oil cylinder ft connection, and described second oil inlet and outlet is by described second cylinder chamber and oil cylinder ft connection; Described piston rod is connected with a connecting rod (2), and described connecting rod (2) is connected with the precession axis of described rotor frame;
Described speed limited valve (4) comprises filler opening (41) and oil outlet (42), and described first oil inlet and outlet unilaterally connected is to described filler opening (41), and described oil outlet (42) unilaterally connected, to described second oil inlet and outlet, forms an oil hydraulic circuit; Described second oil inlet and outlet unilaterally connected is to described filler opening (41), and described oil outlet (42) unilaterally connected, to described first oil inlet and outlet, forms another oil hydraulic circuit;
The inside of described speed limited valve (4) is provided with the spool (6) that longitudinal section is Ω type, described spool (6) by the inside division of described speed limited valve (4) for entering oil pocket and go out oil pocket; Described enter the longitudinal section of oil pocket be inverted U-shaped, described in go out oil pocket longitudinal section be convex; The roof of described spool (6) is provided with leakage hole (8), and the sidewall of described spool (6) is provided with valve port (7), described in enter in oil pocket to be provided with spring (5).
2. according to claim 1ly a kind ofly subtract the precession speed limiting device shaking gyro, it is characterized in that, also comprise solenoid directional control valve (9); Described solenoid directional control valve comprises the first valve port (91), the second valve port (92), the 3rd valve port (93) and the 4th valve port (94), wherein, described first valve port (91) is communicated with the first oil inlet and outlet of described first hydraulic jack (11), described second valve port (92) is communicated with described filler opening (41), described 3rd valve port (93) is communicated with the second oil inlet and outlet of described first hydraulic jack (11), and described 4th valve port (94) is communicated with described oil outlet (42);
Described solenoid directional control valve (9) comprises the first mode of operation and the second mode of operation;
When being in the first mode of operation, described first valve port (91) is to described 4th valve port (94) unilaterally connected, and described second valve port (92), to described 3rd valve port (93) unilaterally connected, forms an oil hydraulic circuit;
When being in the second mode of operation, described 3rd valve port (93) is to described 4th valve port (94) unilaterally connected, and described second valve port (92), to described first valve port (91) unilaterally connected, forms another oil hydraulic circuit;
When the piston assembly of described first hydraulic jack (11) shrinks, described solenoid directional control valve (9) is in the first mode of operation; When the piston assembly of described first hydraulic jack (11) stretches out, described solenoid directional control valve (9) is in the second mode of operation.
3. according to claim 2ly a kind ofly subtract the precession speed limiting device shaking gyro, it is characterized in that, also comprise second hydraulic jack (12) identical with described first hydraulic jack (11) structure; The piston rod of described second hydraulic jack (12) is connected with described connecting rod (2), first oil inlet and outlet of described second hydraulic jack (12) is communicated with described 3rd valve port (93), and the second oil inlet and outlet of described second hydraulic jack (12) is communicated with the second oil inlet and outlet of described first hydraulic jack (11).
4. according to claim 1ly a kind ofly subtract the precession speed limiting device shaking gyro, it is characterized in that, also comprise identical the first one-way valve (101) of structure, the second one-way valve (102), the 3rd one-way valve (103) and the 4th one-way valve (104), described first one-way valve (101), described second one-way valve (102), described 3rd one-way valve (103) and described 4th one-way valve (104) are equipped with entrance and exit;
First oil inlet and outlet of described first hydraulic jack (11) is communicated with the entrance of described first one-way valve (101), the outlet of described first one-way valve (101) is communicated with described filler opening (41), described oil outlet (42) is communicated with the entrance of described 4th one-way valve (104), the outlet of described 4th one-way valve (104) is communicated with the second oil inlet and outlet of described first hydraulic jack (11), forms an oil hydraulic circuit;
Second oil inlet and outlet of described first hydraulic jack (11) is communicated with the entrance of described second one-way valve (102), the outlet of described second one-way valve (102) is communicated with described filler opening (41), described oil outlet (42) is communicated with the entrance of described 3rd one-way valve (103), the outlet of described 3rd one-way valve (103) is communicated with the first oil inlet and outlet of described first hydraulic jack (11), forms another oil hydraulic circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310408708.6A CN103470553B (en) | 2013-09-10 | 2013-09-10 | A kind ofly subtract the precession speed limiting device shaking gyro |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310408708.6A CN103470553B (en) | 2013-09-10 | 2013-09-10 | A kind ofly subtract the precession speed limiting device shaking gyro |
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| CN103470553A CN103470553A (en) | 2013-12-25 |
| CN103470553B true CN103470553B (en) | 2015-10-14 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106907362B (en) * | 2017-04-14 | 2018-08-21 | 中国船舶重工集团公司第七0四研究所 | Subtracting based on magnetorheological fluid shakes gyroscopic procession control system |
| CN114263642B (en) * | 2021-12-23 | 2023-06-30 | 上海新跃联汇电子科技有限公司 | Device and method for controlling precession speed of anti-rolling gyroscope |
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|---|---|---|---|---|
| US4350078A (en) * | 1979-01-02 | 1982-09-21 | Akermans Verkstad Ab | Apparatus for restricting the velocity of a hydraulic piston in its end positions |
| JPH09119405A (en) * | 1995-09-12 | 1997-05-06 | Caterpillar Inc | Snap device for hydraulic cylinder |
| CN2518893Y (en) * | 2002-01-10 | 2002-10-30 | 三一重工股份有限公司 | Left and right lifting oil cylinder synchronous device for asphalt concrete paver mangle |
| CN201040701Y (en) * | 2007-04-20 | 2008-03-26 | 天津港第四港埠公司 | Fork lift hydraulic driving device |
| CN203476860U (en) * | 2013-09-10 | 2014-03-12 | 上海羽翼船舶设备有限公司 | Precession speed limiting device of stabilization gyro |
-
2013
- 2013-09-10 CN CN201310408708.6A patent/CN103470553B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4350078A (en) * | 1979-01-02 | 1982-09-21 | Akermans Verkstad Ab | Apparatus for restricting the velocity of a hydraulic piston in its end positions |
| JPH09119405A (en) * | 1995-09-12 | 1997-05-06 | Caterpillar Inc | Snap device for hydraulic cylinder |
| CN2518893Y (en) * | 2002-01-10 | 2002-10-30 | 三一重工股份有限公司 | Left and right lifting oil cylinder synchronous device for asphalt concrete paver mangle |
| CN201040701Y (en) * | 2007-04-20 | 2008-03-26 | 天津港第四港埠公司 | Fork lift hydraulic driving device |
| CN203476860U (en) * | 2013-09-10 | 2014-03-12 | 上海羽翼船舶设备有限公司 | Precession speed limiting device of stabilization gyro |
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Address after: 201612 Shanghai City, Songjiang District New Town Road No. 201 Shen Xu 1 Building 2 layer Applicant after: Shanghai Yoyeah Marine Equipment Co., Ltd. Address before: 201109, D27 building, building 2, building 988, eleventh middle spring road, Shanghai, Minhang District Applicant before: Shanghai Yoyeah Marine Equipment Co., Ltd. |
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