CN101713424A - Support cylinder disjunction preventing device and support cylinder - Google Patents
Support cylinder disjunction preventing device and support cylinder Download PDFInfo
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- CN101713424A CN101713424A CN200910225677A CN200910225677A CN101713424A CN 101713424 A CN101713424 A CN 101713424A CN 200910225677 A CN200910225677 A CN 200910225677A CN 200910225677 A CN200910225677 A CN 200910225677A CN 101713424 A CN101713424 A CN 101713424A
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- support cylinder
- piston rod
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- drop device
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Abstract
The invention provides a support cylinder disjunction preventing device and a support cylinder. The invention has the structure that an installation block is provided with a first through hole and a second through hole which are arranged coaxially, the first through hole is communicated with the second through hole, the diameter of the first through hole is smaller than that of the second through hole, and the end of the second through hole far from the first through hole is provided with a screw thread; a locating column is in a boss structure, and the top of the boss structure is provided with a spherical structure; the locating column penetrates through the second through hole and is inserted in the first through hole; a spring is inserted in the second through hole, and one end of the spring is contacted with the locating column; a spring base is in a cylindrical structure, the side face of the spring base is provided with a screw thread, the spring base is connected with the second through hole through the screw threads, and the first end of the spring base is contacted the other end of the spring; and the spherical structure is used for abutting against the lower end of an external piston rod, thereby preventing the piston rod in the contraction state from extending out of the cylinder under the action of gravity due to vibrations. Since the locating column abuts against the lower end of the piston rod, the piston rod is firmly fixed in the cylinder, thereby enhancing the reliability of the support cylinder.
Description
Technical field
The embodiment of the invention relates to machinery, relates in particular to a kind of support cylinder anti-drop device and support cylinder.
Background technique
Locomotive crane needs to use support cylinder when not using supporting leg to carry out the lift heavy operation.Support cylinder the be rigidly connected curb girder of hoist bogie and axle wheel etc., transmitted load can guarantee crane body level to rail and roadbed, and the lift heavy job safety is carried out reliably.
In the prior art, the support cylinder in the locomotive crane adopts the double action support cylinder usually.As shown in Figure 1, the double action support cylinder comprises: parts such as oil cylinder 1 ', piston rod 2 ' and oil cylinder seat 3 '.Wherein, the double action support cylinder offers first filler opening 11 ' and second filler opening 12 ' on oil cylinder.When needs stretched out piston rod 2 ' oil cylinder 1 ', the 11 ' oil-feed of first filler opening made piston rod 2 ' stretch out oil cylinder 1 '; When the piston rod 2 ' that will stretch out when needs was regained oil cylinder 1 ', the 12 ' oil-feed of second filler opening made in piston rod 2 ' the withdrawal oil cylinder 1 '.
As mentioned above, when the piston rod in the double action support cylinder was in contraction state, after the double action support cylinder was vibrated, piston rod can stretch out oil cylinder under action of gravity, thereby security incident takes place easily.Therefore, the reliability of support cylinder of the prior art is low.
Summary of the invention
Technical problem to be solved by this invention is: a kind of support cylinder anti-drop device and support cylinder are provided, support cylinder is after being vibrated in the solution prior art, piston rod stretches out the defective of oil cylinder easily, when the piston rod that is implemented in support cylinder is in contraction state, piston rod can be firm be fixed in the oil cylinder, thereby improve the reliability of support cylinder.
Technological scheme provided by the invention is that a kind of support cylinder anti-drop device comprises:
Mounting blocks, be provided with first through hole and second through hole of coaxial setting, described first through hole and described second through hole are communicated with, and the diameter of described first through hole is less than the diameter of described second through hole, and described second through hole is provided with screw thread away from an end of described first through hole;
Locating column is boss structure, and the top of described boss structure is set to the ball-type structure; Described locating column passes described second through hole, is plugged in described first through hole;
Spring is plugged in described second through hole, and an end of described spring contacts with described locating column;
Spring seat is round column structure, and the side of described spring seat is provided with screw thread, and described spring seat and described second through hole are spirally connected, and the first end of described spring seat contacts with the other end of described spring;
Described ball-type structure is used for against the lower end of outer piston bar, to prevent to be in the piston rod of contraction state, because vibration is stretched out oil cylinder under action of gravity.
Embodiment of the invention support cylinder anti-drop device, by locating column is set in mounting blocks, and locating column is applied spring force by spring, make locating column can be resisted against the lower end of the piston rod of support cylinder, effectively prevent to be in the piston rod of contraction state because vibration is stretched out oil cylinder under action of gravity, when the piston rod that is implemented in support cylinder was in contraction state, what piston rod can be firm was fixed in the oil cylinder, thereby has improved the reliability of support cylinder.
Aforesaid support cylinder anti-drop device, spring is assembled in the support cylinder anti-drop device for convenience, make the more firm fixed installation of spring, the bottom of described locating column boss structure is provided with first spring stack, and first end face of described spring seat is provided with second spring stack; The two ends of described spring are set in respectively on described first spring stack and described second spring stack.
Aforesaid support cylinder anti-drop device, Regulation spring is to the spring force that locating column applied for convenience, and second end face of described spring seat offers the screw-driver groove.
Aforesaid support cylinder anti-drop device, the support cylinder anti-drop device is installed and fixed on the support cylinder for convenience, described mounting blocks offers at least one mounting hole, the axis normal of the axis of described mounting hole and described first through hole.
Aforesaid support cylinder anti-drop device, for the more firm support cylinder anti-drop device is installed and fixed on the support cylinder, described mounting blocks offers two described mounting holes, and two described mounting holes lay respectively at the both sides of the axis of described first through hole.
Technological scheme provided by the invention is that a kind of support cylinder comprises oil cylinder, is slidingly installed in piston rod and the oil cylinder seat that is installed in described oil cylinder bottom in the described oil cylinder, also comprises: above-mentioned support cylinder anti-drop device; Described support cylinder anti-drop device is installed on the described oil cylinder seat, and the locating column in the described support cylinder anti-drop device is resisted against on the described piston rod; When described piston rod was in contraction state, the ball-type structure of described locating column was resisted against the lower end of described piston rod, was used to prevent described piston rod because vibration is stretched out under action of gravity.
Embodiment of the invention support cylinder, by the support cylinder anti-drop device is set, in the mounting blocks in support oil cylinder anti-drop device locating column is set, and locating column is applied spring force by spring, make locating column can be resisted against the lower end of the piston rod of support cylinder, effectively prevent to be in the piston rod of contraction state because vibration is stretched out oil cylinder under action of gravity, when the piston rod that is implemented in support cylinder is in contraction state, piston rod can be firm be fixed in the oil cylinder, thereby improved the reliability of support cylinder.
Aforesaid support cylinder, at piston rod when stretching out oil cylinder, make piston rod can be easy to overcome the resistance of locating column, the lower end of described piston rod is provided with the circular arc step; When described piston rod was in contraction state, the ball-type structure of described locating column was resisted against on the circular arc step of described piston rod.
Aforesaid support cylinder, for the convenient firm support cylinder anti-drop device is installed on the support cylinder, support cylinder also comprises tray, is installed on the described oil cylinder seat, described piston rod is located in the through hole that described tray offers; Described support cylinder anti-drop device is installed on the described tray.
Aforesaid support cylinder, uniformly piston rod is exerted pressure in order to make locating column, reduce the suffered total radial force of piston rod, the piston rod in the support cylinder can be stretched stably, described oil cylinder seat evenly is installed with three described support cylinder anti-drop devices.
Aforesaid support cylinder can shrink the piston rod that stretches out fast in order to make support cylinder, and the more effective piston rod of contraction state that prevents stretches out oil cylinder, and support cylinder also comprises Returnning spring, is set on the described piston rod; One end of described Returnning spring is resisted against on the described piston rod, and the other end of described Returnning spring is resisted against on the described oil cylinder seat.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technological scheme of the prior art, to do one to the accompanying drawing of required use in embodiment or the description of the Prior Art below introduces simply, apparently, accompanying drawing in describing below is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural representation of support cylinder in the prior art;
Fig. 2 is the structural representation of support cylinder anti-drop device of the present invention;
Fig. 3 be among Fig. 2 A-A to sectional view;
Fig. 4 is mounting blocks sectional view in the support cylinder anti-drop device of the present invention;
Fig. 5 is the plan view of support cylinder of the present invention;
Fig. 6 is the worm's eye view of support cylinder of the present invention.
Embodiment
For the purpose, technological scheme and the advantage that make the embodiment of the invention clearer, below in conjunction with the accompanying drawing in the embodiment of the invention, technological scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiments.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment who is obtained under the creative work prerequisite.
Fig. 2 is the structural representation of support cylinder anti-drop device of the present invention, and Fig. 3 is that A-A is to sectional view among Fig. 2, and Fig. 4 is mounting blocks sectional view in the support cylinder anti-drop device of the present invention.As Fig. 2, Fig. 3 and shown in Figure 4, present embodiment support cylinder anti-drop device comprises: mounting blocks 1, locating column 2, spring 3 and spring seat 4.
Locating column 2 is a boss structure, and the top of boss structure is set to ball-type structure 21; Locating column 2 passes second through hole 12, is plugged in first through hole 11.Concrete, the locating column 2 in the present embodiment is the piston rods that are used for preventing being in the support cylinder of contraction state, is vibrated the back and stretch out oil cylinder under its action of gravity, causes security incident.Locating column 2 thinner front ends are plugged in first through hole 11, and thicker rear end is plugged in second through hole 12.The step surface that forms between first through hole 11 and second through hole 12 and the step surface effect of locating column 2 will be played position-limiting action to locating column 2.In addition, the top of locating column 2 is set to ball-type structure 21, in the time of can making piston rod stretch out oil cylinder under the effect of pressure oil, can be easy to overcome the restriction of locating column 2, by extruding ball-type structure 21 locating column 2 is pressed in the mounting blocks 1.
Ball-type structure 21 is used for against the lower end of outer piston bar, to prevent the outside piston rod that is in contraction state, because vibration is stretched out oil cylinder under action of gravity.Concrete, apply spring force by 3 pairs of locating columns 2 of spring, make locating column 2 be resisted against the lower end of piston rod, under action of gravity, stretch out oil cylinder owing to vibrating to prevent piston rod.
Embodiment of the invention support cylinder anti-drop device, by locating column is set in mounting blocks, and locating column is applied spring force by spring, make locating column can be resisted against the lower end of the piston rod of support cylinder, effectively prevent to be in the piston rod of contraction state because vibration is stretched out oil cylinder under action of gravity, when the piston rod that is implemented in support cylinder was in contraction state, what piston rod can be firm was fixed in the oil cylinder, thereby has improved the reliability of support cylinder.
Based on technique scheme, optionally, spring 3 is assembled in the support cylinder anti-drop device for convenience, make the more firm fixed installation of spring 3, the bottom of locating column 2 boss structures in the present embodiment is provided with first spring stack 22, and first end face of spring seat 4 is provided with second spring stack 41; The two ends of spring 3 are set in respectively on first spring stack 22 and second spring stack 41.
Particularly, by first spring stack 22 and second spring stack 41 are set, the two ends of spring 3 are set in respectively on first spring stack 22 and second spring stack 41, can easily spring 3 be assembled in the mounting blocks 1, and, because the two ends of spring 3 are subjected to the positioning action of first spring stack 22 and second spring stack 41, spring 3 can be stretched between first spring stack 22 and second spring stack 41, thereby prevent that effectively the generation of the phenomenon of spring 3 torsional deformations from appearring in spring 3 in compression process, avoid causing spring 3 because of torsional deformation lost efficacy, more help improving the reliability of support cylinder.
Based on technique scheme, optionally, for convenience of the spring force that 3 pairs of locating columns 2 of Regulation spring are applied, second end face of the spring seat 4 in the present embodiment offers the screw-driver groove.Concrete, the horizontal vertical screw-driver groove of present embodiment can be yi word pattern, cross, interior hexangle type, interior four jiaos of types or interior trigonometric form screw-driver groove etc., the present invention does not limit the concrete structure of screw-driver groove.
Particularly, it is example that present embodiment offers yi word pattern screw-driver groove 42 with second end face of spring seat 4, and support cylinder anti-drop device of the present invention is described.Second end face at spring seat 4 is provided with yi word pattern screw-driver groove 42, screw-driver can be inserted in the yi word pattern screw-driver groove 42, come the position of Regulation spring seat 4 in second through hole 12 by the rotary screw cutter, the spring force that applied of 3 pairs of locating columns 2 of Regulation spring easily, thereby can realize present embodiment support cylinder anticreep dress by locating column 2, effectively the piston rod to contraction state limits.
Based on technique scheme, optionally, the support cylinder anti-drop device is installed and fixed on the support cylinder for convenience, the mounting blocks 1 in the present embodiment offers at least one mounting hole 13, the axis normal of the axis of mounting hole 13 and first through hole 11.Further, for the more firm support cylinder anti-drop device is installed and fixed on the support cylinder, mounting blocks 1 can offer the both sides that 13, two mounting holes 13 of two mounting holes lay respectively at the axis of first through hole 11.
Particularly, present embodiment support cylinder anti-drop device need be assembled on the support cylinder, so that the piston rod that is in contraction state is limited.By offering mounting hole 13, bolt can be passed mounting hole 13 and be fixed on the support cylinder at mounting blocks 1.In addition, offer two mounting holes 13, can make more firm being fixed on the support cylinder of support cylinder anti-drop device, make the support cylinder anti-drop device stressed uniformly by both sides at the axis of first through hole 11.
Fig. 5 is the plan view of support cylinder of the present invention, and Fig. 6 is the worm's eye view of support cylinder of the present invention.As shown in Figure 5 and Figure 6, the present embodiment support cylinder, comprise oil cylinder 51, be slidingly installed in piston rod 52 and the oil cylinder seat 53 that is installed in oil cylinder 51 bottoms in the oil cylinder 51, also comprise: support cylinder anti-drop device 54, this support cylinder anti-drop device 54 is the support cylinder anti-drop device among the support cylinder anti-drop device embodiment of the present invention.
Support cylinder anti-drop device 54 is installed on the oil cylinder seat 53, and the locating column in the support cylinder anti-drop device 54 (not shown) is resisted against on the piston rod 52; When piston rod 52 was in contraction state, the ball-type structure of locating column was resisted against the lower end of piston rod 52, was used to prevent piston rod 52 because vibration is stretched out under action of gravity.
Particularly, support cylinder anti-drop device 54 in the present embodiment need be fixed on the oil cylinder seat 53, thereby the locating column in the support cylinder anti-drop device 54 is resisted against on the piston rod 52, thereby prevents to be in the piston rod 52 of contraction state under action of gravity owing to vibration is stretched out.For convenient firm support cylinder anti-drop device 54 is installed on the support cylinder, support cylinder can also comprise tray 55, this tray 55 is installed on the oil cylinder seat 53, and piston rod 52 is located in the through hole (not shown) that tray 55 offers; Support cylinder anti-drop device 54 is installed on the tray 55.Concrete, tray 55 can directly be fixed on the oil cylinder seat 53, also can fixedly connected with the present embodiment support cylinder by tray 55 being fixed on the bogie curb girder that is used to install support cylinder.
In addition, support cylinder anti-drop device in the present embodiment can be provided with a plurality of, uniformly piston rod 52 is exerted pressure in order to make locating column, reduce the suffered total radial force of piston rod 52, piston rod 52 in the support cylinder can be stretched stably, and the oil cylinder seat 53 in the present embodiment can evenly be installed with three support cylinder anti-drop devices 54.Concrete, three equally distributed support cylinder anti-drop devices 54 are exerted pressure to piston rod 52 simultaneously, can each locating column of balance to the horizontal force of piston rod 52, thereby effectively guarantee piston rod 52 when stretching out oil cylinder 51, piston rod 52 can be partial to.
Embodiment of the invention support cylinder, by the support cylinder anti-drop device is set, in the mounting blocks in support oil cylinder anti-drop device locating column is set, and locating column is applied spring force by spring, make locating column can be resisted against the lower end of the piston rod of support cylinder, effectively prevent to be in the piston rod of contraction state because vibration is stretched out oil cylinder under action of gravity, when the piston rod that is implemented in support cylinder is in contraction state, piston rod can be firm be fixed in the oil cylinder, thereby improved the reliability of support cylinder.And single-acting formula support cylinder of the prior art, because single-acting formula support cylinder has only one to be used to hydraulic fluid port that piston rod is stretched out, piston rod is that the spring force by Returnning spring is contracted in the oil cylinder.With respect to single-acting formula support cylinder of the prior art, the support cylinder in the present embodiment has at first solved the problem that piston rod stretches out voluntarily under vibration and action of gravity, guarantee traffic safety; Secondly, stretch out and the withdrawal of piston rod still are all-hydraulic action, under the prerequisite that guarantees safe handling, increase work efficiency.
Based on technique scheme, optionally, at piston rod 52 when stretching out oil cylinder 51, make piston rod 52 can be easy to overcome the resistance of locating column, the lower end of the piston rod 52 in the present embodiment is provided with circular arc step 521; When piston rod 52 was in contraction state, the ball-type structure of locating column was resisted against on the circular arc step 521 of piston rod 52.
Particularly, when piston rod 52 was in contraction state, the locating column of support cylinder anti-drop device 54 was resisted against on the circular arc step 521 of piston rod 52, thereby prevented that effectively piston rod 52 from being vibrated the back and stretching out under action of gravity; When piston rod 52 need stretch out, because the lower end of piston rod 52 is a circular arc step 521, circular arc step 521 can be easy to overcome the resistance that the ball-type structure of locating column produces piston rod 52, thereby makes the restriction that overcomes support cylinder anti-drop device 54 that piston rod 52 can be more or less freely.
Based on technique scheme, optionally, can shrink the piston rod 52 that stretches out fast, and the more effective piston rod 52 of contraction state that prevents stretches out oil cylinder 51 in order to make support cylinder, the present embodiment support cylinder can also comprise Returnning spring 56, and this Returnning spring 56 is set on the piston rod 52; One end of Returnning spring 56 is resisted against on the piston rod 52, and the other end of Returnning spring 56 is resisted against on the oil cylinder seat 53.
Particularly, when piston rod 52 stretched out oil cylinder 51, Returnning spring 56 was in compressive state; When piston rod 52 will be retracted in the oil cylinder 51, Returnning spring 56 can push piston rod 52 in the oil cylinder 51 fast, thereby had improved the working efficiency of support cylinder.In addition, Returnning spring 56 can play the effect that limited piston bar 52 stretches out to the piston rod 52 that is in contraction state, thereby effectively prevent to be in the piston rod 52 of contraction state, thereby improved the reliability of support cylinder because vibration is stretched out oil cylinder under action of gravity.
It should be noted that at last: above embodiment only in order to technological scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, 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, and perhaps part technical characteristics wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technological scheme.
Claims (10)
1. a support cylinder anti-drop device is characterized in that, comprising:
Mounting blocks, be provided with first through hole and second through hole of coaxial setting, described first through hole and described second through hole are communicated with, and the diameter of described first through hole is less than the diameter of described second through hole, and described second through hole is provided with screw thread away from an end of described first through hole;
Locating column is boss structure, and the top of described boss structure is set to the ball-type structure; Described locating column passes described second through hole, is plugged in described first through hole;
Spring is plugged in described second through hole, and an end of described spring contacts with described locating column;
Spring seat is round column structure, and the side of described spring seat is provided with screw thread, and described spring seat and described second through hole are spirally connected, and the first end of described spring seat contacts with the other end of described spring;
Described ball-type structure is used for against the lower end of outer piston bar, to prevent to be in the piston rod of contraction state, because vibration is stretched out oil cylinder under action of gravity.
2. support cylinder anti-drop device according to claim 1 is characterized in that the bottom of described locating column boss structure is provided with first spring stack, and first end face of described spring seat is provided with second spring stack; The two ends of described spring are set in respectively on described first spring stack and described second spring stack.
3. support cylinder anti-drop device according to claim 1 and 2 is characterized in that, second end face of described spring seat offers the screw-driver groove.
4. support cylinder anti-drop device according to claim 1 and 2 is characterized in that described mounting blocks offers at least one mounting hole, the axis normal of the axis of described mounting hole and described first through hole.
5. support cylinder anti-drop device according to claim 4 is characterized in that, described mounting blocks offers two described mounting holes, and two described mounting holes lay respectively at the both sides of the axis of described first through hole.
6. a support cylinder comprises oil cylinder, is slidingly installed in piston rod and the oil cylinder seat that is installed in described oil cylinder bottom in the described oil cylinder, it is characterized in that, also comprises: as the arbitrary described support cylinder anti-drop device of claim 1 to 5; Described support cylinder anti-drop device is installed on the described oil cylinder seat, and the locating column in the described support cylinder anti-drop device is resisted against on the described piston rod; When described piston rod was in contraction state, the ball-type structure of described locating column was resisted against the lower end of described piston rod, was used to prevent described piston rod because vibration is stretched out under action of gravity.
7. support cylinder according to claim 6 is characterized in that the lower end of described piston rod is provided with the circular arc step; When described piston rod was in contraction state, the ball-type structure of described locating column was resisted against on the circular arc step of described piston rod.
8. according to claim 6 or 7 described support cylinders, it is characterized in that, also comprise tray, be installed on the described oil cylinder seat, described piston rod is located in the through hole that described tray offers; Described support cylinder anti-drop device is installed on the described tray.
9. support cylinder according to claim 8 is characterized in that, described oil cylinder seat evenly is installed with three described support cylinder anti-drop devices.
10. according to claim 6 or 7 described support cylinders, it is characterized in that, also comprise Returnning spring, be set on the described piston rod; One end of described Returnning spring is resisted against on the described piston rod, and the other end of described Returnning spring is resisted against on the described oil cylinder seat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910225677A CN101713424A (en) | 2009-11-27 | 2009-11-27 | Support cylinder disjunction preventing device and support cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910225677A CN101713424A (en) | 2009-11-27 | 2009-11-27 | Support cylinder disjunction preventing device and support cylinder |
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| Publication Number | Publication Date |
|---|---|
| CN101713424A true CN101713424A (en) | 2010-05-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910225677A Pending CN101713424A (en) | 2009-11-27 | 2009-11-27 | Support cylinder disjunction preventing device and support cylinder |
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| CN (1) | CN101713424A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103010977A (en) * | 2012-12-27 | 2013-04-03 | 徐州重型机械有限公司 | Crane and supporting mechanism thereof |
| CN103043092A (en) * | 2013-01-21 | 2013-04-17 | 北京理工大学 | Hydraulic centering cylinder with mechanical lockup function |
| CN104976181A (en) * | 2015-06-26 | 2015-10-14 | 中国铁建重工集团有限公司 | Structure for avoiding deflection of single propulsion oil cylinder piston rod of shield tunneling machine |
| CN110424914A (en) * | 2019-06-28 | 2019-11-08 | 中国石油集团长城钻探工程有限公司 | Hydraulic support device for cased well |
| CN113153860A (en) * | 2021-05-08 | 2021-07-23 | 潍坊力创电子科技有限公司 | Telescopic reciprocating mechanism |
-
2009
- 2009-11-27 CN CN200910225677A patent/CN101713424A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103010977A (en) * | 2012-12-27 | 2013-04-03 | 徐州重型机械有限公司 | Crane and supporting mechanism thereof |
| CN103043092A (en) * | 2013-01-21 | 2013-04-17 | 北京理工大学 | Hydraulic centering cylinder with mechanical lockup function |
| CN103043092B (en) * | 2013-01-21 | 2015-04-22 | 北京理工大学 | Hydraulic centering cylinder with mechanical lockup function |
| CN104976181A (en) * | 2015-06-26 | 2015-10-14 | 中国铁建重工集团有限公司 | Structure for avoiding deflection of single propulsion oil cylinder piston rod of shield tunneling machine |
| CN104976181B (en) * | 2015-06-26 | 2017-08-25 | 中国铁建重工集团有限公司 | A kind of structure for preventing shield machine list propelling cylinder piston rod from deflecting |
| CN110424914A (en) * | 2019-06-28 | 2019-11-08 | 中国石油集团长城钻探工程有限公司 | Hydraulic support device for cased well |
| CN110424914B (en) * | 2019-06-28 | 2021-10-26 | 中国石油天然气集团有限公司 | Hydraulic support device for cased well |
| CN113153860A (en) * | 2021-05-08 | 2021-07-23 | 潍坊力创电子科技有限公司 | Telescopic reciprocating mechanism |
| CN113153860B (en) * | 2021-05-08 | 2022-07-08 | 潍坊力创电子科技有限公司 | Telescopic reciprocating mechanism |
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Application publication date: 20100526 |