CN102678664A - Hydraulic support oil cylinder and crane - Google Patents
Hydraulic support oil cylinder and crane Download PDFInfo
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- CN102678664A CN102678664A CN2012101767736A CN201210176773A CN102678664A CN 102678664 A CN102678664 A CN 102678664A CN 2012101767736 A CN2012101767736 A CN 2012101767736A CN 201210176773 A CN201210176773 A CN 201210176773A CN 102678664 A CN102678664 A CN 102678664A
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Abstract
The invention provides a hydraulic support oil cylinder and a crane. The hydraulic support oil cylinder comprises a cylinder body and a piston rod matched with the cylinder body, wherein a rodless cavity oil port is formed on a rodless cavity of the cylinder body; a cylinder head is arranged at the end of the cylinder body; a cartridge hydraulic control one-way valve is arranged on the cylinder head and provided with a cartridge hydraulic control one-way valve inlet oil circuit channel, a cartridge hydraulic control one-way valve outlet oil circuit channel and a rod cavity oil circuit channel; the cartridge hydraulic control one-way valve inlet oil circuit channel is communicated with an oil pump; the cartridge hydraulic control one-way valve outlet oil circuit channel is communicated with the rodless cavity oil port through a rodless cavity channel arranged in the cylinder body; and the rod cavity oil circuit channel is communicated with a control oil circuit. Through the technical scheme, the cartridge hydraulic control one-way valve is directly integrated into the cylinder head, so that the using safety of the hydraulic support oil cylinder is ensured.
Description
Technical field
The present invention relates to the mechanical structure technology, relate in particular to a kind of hydraulic pressure support cylinder and hoist.
Background technique
The hoist of existing technology, like railway breakdown crane, the support when all adopting support device realization work, so when increasing work hoist support strength and improve the stability of hoist work, avoid working load excessive and cause hoist to overturn.Railway breakdown crane travels along the railway track, and is mainly used in that railway locomotive is overturned, the stand-by service of derailment accident, also have concurrently simultaneously lay a railway track, the purposes such as loading and unloading of bridge formation and heavy goods.Railway breakdown crane is in when work, bears the weight of the object that railway breakdown crane and quilt sling through hydraulic pressure support cylinder and supporting leg.The hydraulic pressure support cylinder need connect the oil pipe of hydraulic circuit, through inserting oil pipe to hydraulic pressure support cylinder fuel feeding in hydraulic pressure support cylinder outside.In order to guarantee the Security of hydraulic pressure support cylinder, also hydraulic lock need be set, with when using the work of hydraulic pressure support cylinder, cut off the oil circuit of locking hydraulic pressure support cylinder, so that piston remains on the position of setting, thereby make hydraulic pressure support cylinder realization state keep.
Introduce the structure of hydraulic pressure support cylinder below.Referring to Fig. 1 a, the hydraulic pressure support cylinder comprises that cylinder body 1 and part stretch into the piston rod 2 of this cylinder body 1.Cylinder body 1 comprises rod chamber 3 and rodless cavity 4, and rodless cavity 4 is welded with cylinder head 5 away from the end of rod chamber 3.Offer the rodless cavity hydraulic fluid port 45 that is communicated with rodless cavity 4 on the cylinder body 1.
Introduce the principle and the structure of hydraulic lock below.Referring to Fig. 1 b, Fig. 1 b is the principle schematic of hydraulic lock, and Fig. 1 c is the structural representation of hydraulic lock.This sentences model is that the hydraulic lock of 4CK90 is an example, and hydraulic lock 6 comprises the spool 36 that valve body 8 is inner with being installed in valve body 8.Be formed with hydraulic lock import asphalt channel 13, hydraulic lock outlet asphalt channel 14 and rod chamber asphalt channel 15 on the hydraulic lock 6.Above-mentioned hydraulic lock import asphalt channel 13 is used for being communicated with oil pump; Above-mentioned hydraulic lock outlet asphalt channel 14 is communicated with the rodless cavity 4 of hydraulic pressure support cylinder through external oil pipe; Particularly; Through rodless cavity hydraulic fluid port 45, and be provided with seal ring between hydraulic lock outlet asphalt channel 14 and the rodless cavity hydraulic fluid port 45.Above-mentioned rod chamber asphalt channel 15 is used to control hydraulic lock 6 and is in release or blocking as control end.
Referring to Fig. 1 a, be presented in the position that is provided with on the hydraulic pressure support cylinder below.Hydraulic pressure support cylinder top is provided with cylinder head, and machined grooves 34 on cylinder head, and hydraulic lock is arranged in the groove 34, and groove 34 tops are provided with the cover plate of steel, and cover plate is connected with adopting bolt.The oil circuit mouth of hydraulic pressure support cylinder and pass through seal ring sealing, be fastened on the top of oil cylinder with 4 high-strength bolts.
There is following problem at least in existing technology, is connected through external oil pipe between hydraulic lock and the hydraulic pressure support cylinder, and the seal ring of joint receives the influence of ambient temperature to be prone to aging deliquescing, causes hydraulic jack to leak easily, influences the hoist proper functioning; Hydraulic pressure support hydraulic pressure oil cylinder leaks in the hoist work, can make hoist generation overthrow accident.
Summary of the invention
The present invention provides a kind of hydraulic pressure support cylinder and hoist, is used to improve the Security that existing hydraulic lock is used.
The invention provides a kind of hydraulic pressure support cylinder, comprise cylinder body, and the piston rod that cooperates with said cylinder body, offer the rodless cavity hydraulic fluid port on the rodless cavity of said cylinder body, wherein,
The end of said cylinder body is provided with cylinder head; Be formed with the plug-in type Pilot operated check valve on the said cylinder head; The plug-in type Pilot operated check valve has plug-in type Pilot operated check valve import asphalt channel, plug-in type fluid-control one-way valve outlet port asphalt channel and rod chamber asphalt channel; Said plug-in type Pilot operated check valve import asphalt channel is used for being communicated with oil pump; Said plug-in type fluid-control one-way valve outlet port asphalt channel and said rodless cavity hydraulic fluid port are through being arranged on the rodless cavity channel connection of said cylinder interior, and said rod chamber asphalt channel is used for being communicated with control oil channel.
Aforesaid hydraulic pressure support cylinder, preferably:
The rodless cavity hydraulic fluid port is opened in the end of cylinder body, said rodless cavity channel parallel in the axial direction of said cylinder body to be communicated with said plug-in type fluid-control one-way valve outlet port asphalt channel and rodless cavity hydraulic fluid port.
Aforesaid hydraulic pressure support cylinder, preferably: said plug-in type Pilot operated check valve comprises:
Valve body; Said cylinder head is as said valve body; Offer valve pocket on the said valve body, also offer the said plug-in type Pilot operated check valve import asphalt channel that is communicated with said valve pocket, said plug-in type fluid-control one-way valve outlet port asphalt channel and said rod chamber asphalt channel on the said valve body;
Spool; It is inner to be inserted into said valve pocket; Said spool is in primary importance, and feed fluid from said plug-in type Pilot operated check valve import asphalt channel this moment to said valve pocket, and fluid flows to plug-in type fluid-control one-way valve outlet port asphalt channel from said plug-in type Pilot operated check valve import asphalt channel; Said spool is in the second place, and feed fluid from said rod chamber asphalt channel this moment to said valve pocket, and fluid flows to plug-in type Pilot operated check valve import asphalt channel from said plug-in type fluid-control one-way valve outlet port asphalt channel.
Aforesaid hydraulic pressure support cylinder, preferably: the axial direction of said valve pocket is in the plane that is parallel to said cylinder body radial direction.
Aforesaid hydraulic pressure support cylinder, preferably: offer the rod chamber hydraulic fluid port on the rod chamber of said cylinder body, said rod chamber hydraulic fluid port is communicated with said rod chamber asphalt channel through the rod chamber passage.
Aforesaid hydraulic pressure support cylinder, preferably: between said plug-in type fluid-control one-way valve outlet port asphalt channel and the said rodless cavity hydraulic fluid port pressure transducer passage is set, and pressure transducer is installed at said pressure transducer access port place.
Aforesaid hydraulic pressure support cylinder, preferably:
Be formed with the right angle boss on the said cylinder head, the opening of said plug-in type Pilot operated check valve import asphalt channel, pressure transducer passage and rod chamber asphalt channel all is opened on one of them plane of said right angle boss.
The present invention also provides a kind of hoist, it is characterized in that, comprises the hydraulic pressure support cylinder that the present invention provides arbitrarily.
The hydraulic pressure support cylinder that technique scheme provides; Directly be integrated in the plug-in type Pilot operated check valve on the cylinder head; Because plug-in type fluid-control one-way valve outlet port asphalt channel and rodless cavity hydraulic fluid port are through being arranged on the rodless cavity channel connection of cylinder interior; Need not to re-use Sealing, guaranteed the Security that the hydraulic pressure support cylinder uses.
Description of drawings
Fig. 1 a is the structural representation of hydraulic pressure support cylinder in the existing technology;
Fig. 1 b is the principle schematic of hydraulic lock in the existing technology;
Fig. 1 c is the structural representation of hydraulic lock in the existing technology;
Fig. 2 a is the structural representation of the hydraulic pressure support cylinder that provides of the embodiment of the invention;
Fig. 2 b is the principle schematic that the hydraulic pressure support cylinder of Fig. 2 a is connected with oil pump;
Fig. 2 c be among Fig. 2 a cylinder body and cylinder head be connected schematic representation;
Fig. 2 d looks schematic representation for the master of cylinder head among Fig. 2 a;
Fig. 2 e is the schematic top plan view of Fig. 2 d;
Fig. 2 f looks schematic representation for the left side of Fig. 2 d.
Embodiment
Referring to Fig. 2 a and Fig. 2 b; The embodiment of the invention provides a kind of hydraulic pressure support cylinder, comprises cylinder body 16, and the piston rod 17 that cooperates with cylinder body 16; Offer rodless cavity hydraulic fluid port 18 on the rodless cavity of cylinder body 16; Wherein, the end of cylinder body 16 is provided with cylinder head 19, is formed with plug-in type Pilot operated check valve 20 on the cylinder head 19; Plug-in type Pilot operated check valve 20 has plug-in type Pilot operated check valve import asphalt channel 21, plug-in type fluid-control one-way valve outlet port asphalt channel 22 and rod chamber asphalt channel 23; Plug-in type Pilot operated check valve import asphalt channel 21 is used for being communicated with oil pump 37, and plug-in type fluid-control one-way valve outlet port asphalt channel 22 is communicated with through being arranged on cylinder body 16 inner rodless cavity passages 27 with rodless cavity hydraulic fluid port 18, and rod chamber asphalt channel 23 is used for being communicated with control oil channel.Here, cylinder body 16 end that is positioned at rod chamber is provided with guide sleeve 38.
In the technique scheme,, make cylinder head have enough spaces the plug-in type Pilot operated check valve is set through changing the thickness of cylinder body cylinder head; The rodless cavity hydraulic fluid port of plug-in type fluid-control one-way valve outlet port asphalt channel and hydraulic pressure support cylinder all is arranged on the cylinder body; Making can be through being arranged on the rodless cavity channel connection of cylinder interior between plug-in type fluid-control one-way valve outlet port asphalt channel and the rodless cavity hydraulic fluid port; So just need not between plug-in type fluid-control one-way valve outlet port asphalt channel and rodless cavity hydraulic fluid port, Sealing to be set; Thereby avoid having guaranteed the reliability of hydraulic pressure support cylinder usability because of the aging fluid leakage phenomenon that causes of Sealing.Need to prove; The trend of rodless cavity passage is arbitrarily, be communicated with as long as can realize plug-in type fluid-control one-way valve outlet port asphalt channel and rodless cavity hydraulic fluid port, but the size of rodless cavity passage should satisfy under the prerequisite of user demand; Little in order to avoid influence the rigidity of cylinder body as far as possible.The above-mentioned hydraulic pressure support cylinder that has a plug-in type Pilot operated check valve is safe and reliable and simple in structure.
Referring to Fig. 2 c; In order to make the rodless cavity passage be convenient to be processed to form; Optional is, rodless cavity hydraulic fluid port 18 is opened in the end of cylinder body 16, and rodless cavity passage 27 is parallel to the axial direction of cylinder body 16 to be communicated with plug-in type fluid-control one-way valve outlet port asphalt channel 22 and rodless cavity hydraulic fluid port 18.
In the present embodiment, the plug-in type Pilot operated check valve can adopt structure of the prior art, to reduce manufacture cost.Referring to Fig. 2 d-Fig. 2 f, the plug-in type Pilot operated check valve specifically comprises valve body and spool, and spool is referring to Fig. 1 c here; Cylinder head 19 offers valve pocket 26 as valve body on the valve body, also offer the plug-in type Pilot operated check valve import asphalt channel 21, plug-in type fluid-control one-way valve outlet port asphalt channel 22 and the rod chamber asphalt channel 23 that are communicated with valve pocket on the valve body; Spool is inserted into valve pocket 26 inside, offers tapped hole 34 on the valve pocket 26 particularly.Spool is in primary importance, and feed fluid from plug-in type Pilot operated check valve import asphalt channel 21 this moment to valve pocket 26, and fluid flows to plug-in type fluid-control one-way valve outlet port asphalt channel 22 from plug-in type Pilot operated check valve import asphalt channel 21.At this moment, stop in plug-in type Pilot operated check valve import asphalt channel 21 oil-filledly, plug-in type Pilot operated check valve 20 promptly is in blocking.Spool is in the second place; Feed fluid from rod chamber asphalt channel 23 this moment to valve pocket 26; Fluid flows to plug-in type Pilot operated check valve import asphalt channel 21 from plug-in type fluid-control one-way valve outlet port asphalt channel 22, and promptly plug-in type Pilot operated check valve 20 is in the locking released state, at this moment; Maintenance is oil-filled in rod chamber asphalt channel 23, and plug-in type Pilot operated check valve 20 promptly is in released state.Here, spool can be selected for use and have externally threaded standard plug-in mounting spool.
In the practical application, referring to Fig. 2 c or Fig. 2 e, be formed with the right angle boss on the cylinder head 19, the opening of plug-in type Pilot operated check valve import asphalt channel 21, pressure transducer passage and rod chamber asphalt channel 23 all is opened on one of them plane of right angle boss.Referring to Fig. 2 c; Here particularly, the right angle boss has mutual vertical plane W face and N face, and the opening of opening, pressure transducer hydraulic fluid port 33 and the rod chamber asphalt channel 23 of plug-in type Pilot operated check valve import asphalt channel 21 is opened on the N face of right angle boss; During installation; Two planes of right angle boss all lean against support beam and are difficult to the side of being touched by external component, and are promptly inboard, collide with preventing.
Referring to Fig. 2 a or Fig. 2 b or Fig. 2 c, for the ease of on cylinder head 19, offering valve pocket 26, can valve pocket 26 be arranged to following direction: the axial direction of valve pocket 26 is in the plane that is parallel to cylinder body 16 radial direction.
, further, offer rod chamber hydraulic fluid port 32 on the rod chamber of cylinder body 16 here, rod chamber hydraulic fluid port 32 is communicated with rod chamber asphalt channel 23 through rod chamber passage 24.
For the Security that guarantees that the hydraulic pressure support cylinder uses; Pressure transducer can be set, with the pressure in the real-time control cylinder body rodless cavity, referring to Fig. 2 c; So preferably; Be provided with the pressure transducer passage between plug-in type fluid-control one-way valve outlet port asphalt channel 22 and the rodless cavity hydraulic fluid port 18, and pressure transducer 35 be installed, referring to Fig. 2 b at this pressure transducer access port place.Pressure transducer 35 is set monitors and to control the working pressure value of the interior oil liquid pressure of rodless cavity with control hydraulic pressure support cylinder.
Technique scheme; Directly be integrated in the plug-in type Pilot operated check valve on the cylinder head; Because plug-in type fluid-control one-way valve outlet port asphalt channel and rodless cavity hydraulic fluid port need not to re-use Sealing through being arranged on the rodless cavity channel connection of cylinder interior, guaranteed the Security that the hydraulic pressure support cylinder uses; Between plug-in type fluid-control one-way valve outlet port asphalt channel and rodless cavity hydraulic fluid port, be provided with pressure transducer, be convenient to control the force value in the rodless cavity, improve the Security that the hydraulic pressure support cylinder uses.The hydraulic pressure support cylinder that technique scheme provides, safety reliability, and good social benefit is arranged; Above-mentioned hydraulic pressure support cylinder simple in structure, be convenient to install, easy to maintenance, good manufacturability, and low cost of manufacture.
The embodiment of the invention also provides a kind of hoist, wherein, comprises the hydraulic pressure support cylinder that any embodiment of the present invention provides.
Technique scheme; Directly be integrated with the plug-in type Pilot operated check valve on the hydraulic pressure support cylinder; And plug-in type fluid-control one-way valve outlet port asphalt channel and rodless cavity hydraulic fluid port are through being arranged on the rodless cavity channel connection of cylinder interior; Need not to re-use Sealing, guaranteed the Security that the hydraulic pressure support cylinder uses; Between plug-in type fluid-control one-way valve outlet port asphalt channel and rodless cavity hydraulic fluid port, be provided with pressure transducer, be convenient to control the force value in the rodless cavity, improve the Security that the hydraulic pressure support cylinder uses, and the Security of hoist lifting work.Technique scheme has solved the security hidden trouble that hoist exists in the existing technology, has effectively improved the safety reliability of hoist, has optimized structure, has simplified technology, has reduced cost, and expanded the function of use of hoist.
What should explain at last is: above each embodiment is only in order to explaining technological scheme of the present invention, but not to its restriction; Although the present invention has been carried out detailed explanation with reference to aforementioned each embodiment; Those of ordinary skill in the art is to be understood that: it still can be made amendment to the technological scheme that aforementioned each embodiment put down in writing, perhaps to wherein part or all technical characteristic are equal to replacement; And these are revised or replacement, do not make the scope of the essence disengaging various embodiments of the present invention technological scheme of relevant art scheme.
Claims (8)
1. a hydraulic pressure support cylinder comprises cylinder body, and the piston rod that cooperates with said cylinder body, offers the rodless cavity hydraulic fluid port on the rodless cavity of said cylinder body, it is characterized in that,
The end of said cylinder body is provided with cylinder head; Be formed with the plug-in type Pilot operated check valve on the said cylinder head; The plug-in type Pilot operated check valve has plug-in type Pilot operated check valve import asphalt channel, plug-in type fluid-control one-way valve outlet port asphalt channel and rod chamber asphalt channel; Said plug-in type Pilot operated check valve import asphalt channel is used for being communicated with oil pump; Said plug-in type fluid-control one-way valve outlet port asphalt channel and said rodless cavity hydraulic fluid port are through being arranged on the rodless cavity channel connection of said cylinder interior, and said rod chamber asphalt channel is used for being communicated with control oil channel.
2. hydraulic pressure support cylinder according to claim 1 is characterized in that:
The rodless cavity hydraulic fluid port is opened in the end of cylinder body, said rodless cavity channel parallel in the axial direction of said cylinder body to be communicated with said plug-in type fluid-control one-way valve outlet port asphalt channel and rodless cavity hydraulic fluid port.
3. hydraulic pressure support cylinder according to claim 1 and 2 is characterized in that, said plug-in type Pilot operated check valve comprises:
Valve body; Said cylinder head is as said valve body; Offer valve pocket on the said valve body, also offer the said plug-in type Pilot operated check valve import asphalt channel that is communicated with said valve pocket, said plug-in type fluid-control one-way valve outlet port asphalt channel and said rod chamber asphalt channel on the said valve body;
Spool; It is inner to be inserted into said valve pocket; Said spool is in primary importance, and feed fluid from said plug-in type Pilot operated check valve import asphalt channel this moment to said valve pocket, and fluid flows to plug-in type fluid-control one-way valve outlet port asphalt channel from said plug-in type Pilot operated check valve import asphalt channel; Said spool is in the second place, and feed fluid from said rod chamber asphalt channel this moment to said valve pocket, and fluid flows to plug-in type Pilot operated check valve import asphalt channel from said plug-in type fluid-control one-way valve outlet port asphalt channel.
4. hydraulic pressure support cylinder according to claim 3 is characterized in that: the axial direction of said valve pocket is in the plane that is parallel to said cylinder body radial direction.
5. hydraulic pressure support cylinder according to claim 1 and 2 is characterized in that: offer the rod chamber hydraulic fluid port on the rod chamber of said cylinder body, said rod chamber hydraulic fluid port is communicated with said rod chamber asphalt channel through the rod chamber passage.
6. hydraulic pressure support cylinder according to claim 3; It is characterized in that: between said plug-in type fluid-control one-way valve outlet port asphalt channel and the said rodless cavity hydraulic fluid port pressure transducer passage is set, and pressure transducer is installed at said pressure transducer access port place.
7. hydraulic pressure support cylinder according to claim 6 is characterized in that:
Be formed with the right angle boss on the said cylinder head, the opening of said plug-in type Pilot operated check valve import asphalt channel, pressure transducer passage and rod chamber asphalt channel all is opened on one of them plane of said right angle boss.
8. a hoist is characterized in that, comprises the arbitrary described hydraulic pressure support cylinder of claim 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101767736A CN102678664A (en) | 2012-05-31 | 2012-05-31 | Hydraulic support oil cylinder and crane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101767736A CN102678664A (en) | 2012-05-31 | 2012-05-31 | Hydraulic support oil cylinder and crane |
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| Publication Number | Publication Date |
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| CN102678664A true CN102678664A (en) | 2012-09-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012101767736A Pending CN102678664A (en) | 2012-05-31 | 2012-05-31 | Hydraulic support oil cylinder and crane |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103423233A (en) * | 2013-09-02 | 2013-12-04 | 戴慈科 | Hydraulic oil cylinder protective device |
| CN104632770A (en) * | 2014-12-31 | 2015-05-20 | 太原科技大学 | Supporting structure and method of large horizontal type heavy-load servo hydraulic cylinder |
| CN108649450A (en) * | 2018-06-19 | 2018-10-12 | 徐州卓纳科技服务有限公司 | A kind of transformer tank device of rain-proof dust-proof in for transformer |
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| EP0097739A1 (en) * | 1982-06-30 | 1984-01-11 | Hydro-Gerätebau GmbH & Co. KG Hebezeuge | Hydraulic support arrangements |
| DE20106762U1 (en) * | 2001-04-19 | 2001-09-20 | Schlutz, Heinz, 45770 Marl | Support cylinder |
| CN2916219Y (en) * | 2005-10-26 | 2007-06-27 | 长沙中联重工科技发展股份有限公司 | Built-in hydraulic oil cylinder |
| CN101224857A (en) * | 2008-02-25 | 2008-07-23 | 齐齐哈尔轨道交通装备有限责任公司 | Support cylinder as well as support means and crane having the same |
| CN201851423U (en) * | 2010-11-16 | 2011-06-01 | 韶关市西马克液压缸有限公司 | Small-axle supported oil cylinder |
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2012
- 2012-05-31 CN CN2012101767736A patent/CN102678664A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0097739A1 (en) * | 1982-06-30 | 1984-01-11 | Hydro-Gerätebau GmbH & Co. KG Hebezeuge | Hydraulic support arrangements |
| DE20106762U1 (en) * | 2001-04-19 | 2001-09-20 | Schlutz, Heinz, 45770 Marl | Support cylinder |
| CN2916219Y (en) * | 2005-10-26 | 2007-06-27 | 长沙中联重工科技发展股份有限公司 | Built-in hydraulic oil cylinder |
| CN101224857A (en) * | 2008-02-25 | 2008-07-23 | 齐齐哈尔轨道交通装备有限责任公司 | Support cylinder as well as support means and crane having the same |
| CN201851423U (en) * | 2010-11-16 | 2011-06-01 | 韶关市西马克液压缸有限公司 | Small-axle supported oil cylinder |
Non-Patent Citations (1)
| Title |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103423233A (en) * | 2013-09-02 | 2013-12-04 | 戴慈科 | Hydraulic oil cylinder protective device |
| CN103423233B (en) * | 2013-09-02 | 2016-03-23 | 戴慈科 | A kind of hydraulic oil cylinder protective device |
| CN104632770A (en) * | 2014-12-31 | 2015-05-20 | 太原科技大学 | Supporting structure and method of large horizontal type heavy-load servo hydraulic cylinder |
| CN108649450A (en) * | 2018-06-19 | 2018-10-12 | 徐州卓纳科技服务有限公司 | A kind of transformer tank device of rain-proof dust-proof in for transformer |
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Application publication date: 20120919 |