CN201502580U - Multilevel internal tandem hydraulic pusher - Google Patents
Multilevel internal tandem hydraulic pusher Download PDFInfo
- Publication number
- CN201502580U CN201502580U CN2009201506636U CN200920150663U CN201502580U CN 201502580 U CN201502580 U CN 201502580U CN 2009201506636 U CN2009201506636 U CN 2009201506636U CN 200920150663 U CN200920150663 U CN 200920150663U CN 201502580 U CN201502580 U CN 201502580U
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- piston rod
- cylinder barrel
- short circuit
- piston
- hole
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Abstract
The utility model discloses a multilevel internal tandem hydraulic pusher, which comprises an upper contact used to be connected with other parts at the top part of the pusher, two or more than two cylinders, two or more than two pistons, at least one upper piston rod, and a lower piston rod in short connection with the two or more than two cylinders and is connected with the parts below the pusher. In the pusher, a plurality of fluid cylinders are connected sequentially in series through the upper piston rod and the through hole in the interior of the piston. And as a result, under the condition that the diameter of the multilevel internal tandem hydraulic pusher is identical with that of an ordinary hydraulic cylinder, the output power thereof is equal to the total sum of the output forces of a plurality of single-level hydraulic cylinders.
Description
Technical field
The utility model is about a kind of hydraulic machinery, more particularly, and about a kind of multistage internal series-connection formula hydraulic pusher.
Background technique
Propulsion device in the oil hydraulic cylinder is a kind of legacy equipment of routine in hydraulic pressure or pneumatic equipment system, being widely used in each engineering fields such as metallurgy, transportation, traffic, mine, oil, is a kind of very important executive component and power equipment in the hydraulics field.Traditional propulsion device has the single cylinder structure, and cascaded structure is also arranged, and the oil hydraulic cylinder of cascaded structure is to connect in order by exterior tubing to realize at present.But in oilfield applications because narrower and small in oil well inside dimension space, used propulsion device can only be made into thin long again cascaded structure when casing deformation was keeped in repair, if adopt traditional cascaded structure not only to exist to realize the problem that connects, and when the distortion of sleeve pipe is repaired, owing to need the above working pressure of 70MPa, make working pressure quite high, exist equipment such as dangerous, supporting pipeline and oil hydraulic pump to be difficult to problems such as realization again.
The model utility content
The purpose of this utility model is to provide does not all have the control pipeline inside and outside a kind of, and is realized the propulsion device of plural serial stage by internal structure.
Another purpose of the present utility model is to provide a kind of and realizes plural serial stage by internal structure, and can realize deciding the propulsion device of journey pressure release.
Multistage internal series-connection formula hydraulic pusher in the utility model includes the lower piston rod that is used for the upper connection that is connected with described propulsion device top miscellaneous part, two or more cylinder barrel, two or more piston, at least one upper piston rod, two or more cylinder barrel short circuit and is used to connect described propulsion device lower part, wherein:
Described cylinder barrel and described cylinder barrel short circuit are provided with at interval successively and are sealedly connected and fixed and form the middle part and have and be used to the straight-bar in hole all, cylinder barrel end sealing at described straight-bar top connects described upper connection, described straight-bar be used to all in the hole from the top be provided with described piston and the upper piston rod that sealing and fixing links into an integrated entity at interval to the bottom, the sealing that described each piston can slide up and down is arranged on the top of each corresponding cylinder barrel short circuit, described upper piston rod and sealing simultaneously slided and passed the cylinder barrel short circuit of described correspondence, the lower end of the piston below the described lower piston rod that directly is sealedly and fixedly connected, described lower piston rod sealing is slided and is extended described cylinder barrel short circuit bottom, lower end surface at described piston, the upper-end surface of cylinder barrel short circuit, the internal face of cylinder barrel, being formed with one or more between the outer wall of upper piston rod or lower piston rod is not communicated with but the external pressure chamber that is in communication with the outside respectively mutually, simultaneously in described upper connection, piston, be formed with an internal pressure chamber that is in communication with the outside by described upper connection between cylinder barrel short circuit and the upper piston rod, described internal pressure chamber is not communicated with mutually with described external pressure chamber.
The centre of described cylinder barrel short circuit is provided with the endoporus that supplies described upper piston rod or lower piston rod to pass, be provided with in outer wall and be used for the outside thread that is tightly connected with described cylinder barrel, described cylinder barrel short circuit is provided with the hole that is used to be communicated with described external pressure chamber and external pressure feeding mechanism simultaneously.
The hole that being used to of being provided with on the described cylinder barrel short circuit is communicated with described external pressure chamber and external pressure feeding mechanism is two, and vertical connection mutually.
Described cylinder barrel short circuit is dynamically connected via rod seal ring, rod seal circle gland and bolt and described upper piston rod or lower piston rod sealed sliding.
Be sealedly and fixedly connected by screw thread, seal ring between described piston and described upper piston rod, the described lower piston rod.
The bottom of described upper piston rod is provided with and is communicated with the inside and outside perforation of described upper piston rod, described internal pressure chamber is interconnected by through hole that is provided with respectively in the middle part of described piston, the upper piston rod and the perforation on the described upper piston rod sidewall, and is communicated with the internal pressure feeding mechanism by the through hole of described upper connection.
The middle part of described lower piston rod is provided with counterbore, be provided with the perforation that is communicated with inside and outside the described lower piston rod in the bottom of described counterbore, connect at described cylinder barrel short circuit lower seal below simultaneously and be used to control cylinder barrel and the following box cupling that described internal pressure chamber decide the journey pressure release.
Between described down box cupling and the described lower piston rod by rod seal ring and sealing steel rings slipper seal.
Between described inner wall of cylinder and the described piston by piston packing ring gland and piston packing ring slipper seal.
The series connection of the down stroke oil hydraulic circuit of multistage internal series-connection formula hydraulic pusher is to be realized by the through hole of upper piston rod, internal piston in the utility model, and promptly the through hole by upper piston rod, internal piston is with orderly being combined in series of a plurality of oil hydraulic cylinders.Make under the diameter of the multistage internal series-connection formula hydraulic pusher condition identical with the diameter of common oil hydraulic cylinder, ouput force is equivalent to the ouput force sum of a plurality of single stage hydraulic cylinder, and be one regularly in the system requirements ouput force, adopt the utility model can make the pressure rating decline several times of whole system, promptly can under low equal pressure condition, realize huge outputting power.
In addition, the utility model is by being provided with counterbore and perforation on lower piston rod, can realize deciding the journey pressure relief, thereby when well workover is constructed, can very clearly know that from ground down-hole actual working pressure and construction section finish, thereby make and utilize hydraulic method to realize that oil well casing Deformation Repair technology becomes possibility.
Description of drawings
Fig. 1 is an angle of rake structural representation among the utility model embodiment one;
Fig. 2 is the enlarged diagram of part shown in the A among Fig. 1;
Fig. 3 is the enlarged diagram of part shown in the B among Fig. 1;
Fig. 4 is the enlarged diagram of part shown in the C among Fig. 1;
Fig. 5 is the enlarged diagram of part shown in the D among Fig. 1;
Fig. 6 is an angle of rake structural representation among the utility model embodiment two;
Fig. 7 is the enlarged diagram of part shown in the E among Fig. 6;
Fig. 8 is an angle of rake structural representation among the utility model embodiment three;
Fig. 9 is the enlarged diagram of part shown in the E among Fig. 7.
Embodiment
The specific embodiment of the utility model is described in further detail below in conjunction with accompanying drawing.
Embodiment one
As shown in Figure 1, the multistage internal series-connection formula of the journey pressure release hydraulic pusher of deciding in the present embodiment includes a upper connection 1, four cylinder barrels 2, three pistons 3, two upper piston rods 4, three cylinder barrel short circuits 5, a plurality of rod seal ring 6, a plurality of rod seal circle gland 7, a plurality of bolt 8, a plurality of seal ring 9, a plurality of piston packing ring gland 14, a plurality of piston packing ring 15, following box cupling 11, a plurality of sealing steel rings 12 and a lower piston rod 13, wherein:
As shown in Figure 2, the upper end of upper connection 1 is provided with internal thread 100, utilizes this internal thread 100 to connect with propulsion device top miscellaneous part, as: exterior tubing or equipment.The centre of upper connection 1 is provided with through hole 101, and lower end, the outside is provided with outside thread 102, is provided with circular groove 103 in the top of this outside thread 102, utilizes this circular groove 103 to be provided with seal ring 9, thereby upper connection 1 and cylinder barrel 2 are sealedly and fixedly connected.
As Fig. 1, Fig. 2 and shown in Figure 3, cylinder barrel 2 is a tubular-shaped structures that bore area is smooth, be equipped with internal thread 201,202 at upper/lower terminal, wherein Shang Duan internal thread 201 connects with the outside thread 102 of upper connection 1, and by seal ring 9 sealings, the outside thread 202 of lower end is tightly connected with the outside thread 501 of cylinder barrel short circuit 5 upper ends, can be sealing gasket or seal ring (not shown).
As shown in Figure 3, on the cylinder barrel short circuit 5, following two ends are equipped with outside thread 501,502, top at the outside thread 502 of lower end is provided with circular groove 503, in this circular groove 503, be provided with the seal ring 9 of next cylinder barrel 2 that is used to be tightly connected, the centre of this cylinder barrel short circuit 5 is provided with the endoporus 504 that is used to wear upper piston rod 4 or lower piston rod 13, inboard, lower end at this endoporus 504 is provided with circular groove 505, be provided with several bolts hole 509 vertically upward in the lower end surface of circular groove 505, in circular groove 505, inserted rod seal ring 6, the lower end of circular groove 505 is provided with internal thread 506, this internal thread 506 is used to screw rod seal circle gland 7, rod seal ring 6 is fixing, the circular periphery of rod seal circle gland 7 has several holes 701, in hole 701, screw in bolt 8, this bolt 8 and then be screwed in the bolt hole 509 of cylinder barrel short circuit 5 end faces is further fixed rod seal circle gland 7 to rod seal ring 6 fixing the time.Middle outer side surface at cylinder barrel short circuit 5 is provided with a vertical inside hole 507, is provided with a hole 508 vertically downward on the upper-end surface, and these two holes 507,508 are interconnected, as shown in Figure 3.
The outside thread 501 of cylinder barrel short circuit 5 upper ends connects with the internal thread 202 of cylinder barrel 2 lower ends that are positioned at cylinder barrel short circuit 5 tops, the outside thread 502 of lower end connects with the internal thread 202 of cylinder barrel 2 upper ends that are positioned at its below, equally, following cylinder barrel 2 is connected with another cylinder barrel short circuit 5 of below, as shown in Figure 1, connect next cylinder barrel 2 again by cylinder barrel short circuit 5 again, be linked in sequence so successively, present embodiment has 4 with cylinder barrel 2, cylinder barrel short circuit 5 has 3 to be example, a cylinder barrel short circuit 5 is tightly connected between per two cylinder barrels 2, but cylinder barrel 2 is not limited to this with the quantity of cylinder barrel short circuit 5, can increase and delete according to different demands, as long as be in turn connected to form direct rod shape, and be formed with one in cylinder barrel 2 and cylinder barrel short circuit 5 inside and vertically be used to the through hole that leads to by said structure.
Be connected with box cupling 11 down in the bottom of bottom cylinder barrel 2, as shown in Figure 5, the inside of following box cupling 11 is provided with the manhole 110 that passes for lower piston rod 13, in the downside of this manhole 110, be provided with circular groove 111, in circular groove 111, be provided with rod seal ring 6 and sealing steel rings 12, the below of circular groove 111 is provided with internal thread 112, and rod seal circle gland 7 has been screwed at these internal thread 112 places, and by bolt 8 that rod seal circle gland 7 is further fixing.
As Fig. 2 and shown in Figure 4, the centre of piston 3 is provided with the through hole 300 that is communicated with upper connection 1 through hole 101, outer side surface at piston 3 is provided with annular table 301, inserted piston packing ring 15 between the inwall of these annular table 301 tops and cylinder barrel 2, and by outside thread 302 and two cylinder barrel seal ring glands 14 piston packing ring 15 is fixed, the piston 3 and the inner wall sealing of cylinder barrel 2 are slidingly connected.Piston 3 is equipped with internal thread 303 and straight mouthful 304 in the upper and lower both sides of through hole 300, be used to be threaded upper piston rod 4 or lower piston rod 13, and be tightly connected by the seal ring 9 of inserting in upper piston rod 4 or the lower piston rod 13 outer surface circular grooves.In addition, place piston 3 topmost can not to be provided with, as shown in Figure 2, processing is simplified more at the internal thread of through hole 300 upsides.
As shown in figures 1 and 3, upper piston rod 4 is a ganoid straight-bar, inside middle is provided with through hole 400, the internal thread 303 that cylinder barrel short circuit 5 backs and another piston 3 through holes 300 upsides are passed in the lower end is tightly connected, upper/lower terminal at upper piston rod 4 is provided with outside thread 402 and circular groove 401 equally, outside thread 402 connects with piston 3, and circular groove 401 is used to be provided with seal ring 9.Upper piston rod 4 is provided with inwardly vertical perforation 403 near circular groove 401 tops of lower end, communicate with the through hole 400 of upper piston rod 4 inside, utilize this perforation 403 to be communicated with the through hole 400 of upper piston rod 4 inside and the room (internal pressure chamber) that between piston 3 and cylinder barrel short circuit 5, forms.
As Fig. 1, Fig. 4 and shown in Figure 5, lower piston rod 13 is consistent with upper piston rod 4, it also is a ganoid straight-bar, be provided with outside thread and the circular groove that is used to be provided with seal ring 9 in the upper end, but the centre is provided with a counterbore that does not penetrate 1300, be provided with a perforation 1302 that penetrates lower piston rod 13 walls at the bottom of counterbore 1300 side, be used to be communicated with the counterbore 1300 of lower piston rod 13 inside and the room 16 that between cylinder barrel short circuit 5 and following box cupling 11, forms.Extending down at lower piston rod 13, an end of box cupling 11 is provided with the outside thread 1301 that is used to connect the parts that driven by propulsion device.
As depicted in figs. 1 and 2, in upper connection 1, cylinder barrel 2, cylinder barrel short circuit 5 and form one down between the box cupling 11 and vertically be used to the through hole that leads to, in this through hole, be positioned at each cylinder barrel short circuit 5 above be provided with a piston 3 that can slide up and down along cylinder barrel 2 inner wall sealings, lower end at preceding two pistons 3 all is connected with upper piston rod 4, this upper piston rod 4 is sealedly and fixedly connected with the upper end of next piston 3 simultaneously, the lower end of the 3rd piston 3 of the below lower piston rod 13 that directly is sealedly and fixedly connected, this lower piston rod 13 further passes down box cupling 11 after passing bottom cylinder barrel short circuit 5, need to be connected with the below by the parts (not shown) that propulsion device drives, wherein upper piston rod 4, lower piston rod 13 and cylinder barrel short circuit 5, between the following box cupling 11 by rod seal ring 6, and slidably, thereby can make piston 3, upper piston rod 4, inner hole wall sealing along cylinder barrel 2 inwalls and cylinder barrel short circuit 5 in the through hole that lower piston rod 13 forms above the cylinder barrel short circuit 5 of correspondence is slided, and at piston 3, cylinder barrel short circuit 5, the outer wall of upper piston rod 4 or lower piston rod 13, be formed with three annular spaces between the inwall of cylinder barrel 2, these three annular spaces are the hole 508 of cylinder barrel short circuit 5 respectively, 507 are in communication with the outside, and are called external pressure chamber or perimeter.
Simultaneously between upper connection 1 and piston 3, bottom at cylinder barrel short circuit 5, the top of piston 3 or following box cupling 11, the inwall of the outer wall of upper piston rod 4 or lower piston rod 11 and cylinder barrel 2 is formed with four and above-mentioned three disconnected annular spaces in outside area field, these four annular spaces pass through the endoporus of upper connection 1 respectively, the endoporus 300 of piston 3, the perforation 1302 of the endoporus 400 of upper piston rod 4 and the endoporus 1300 of lower piston rod 13 and sidewall communicates, become same identical pressure span, abbreviate internal pressure chamber or inner region as, this inner region is not communicated with mutually with the perimeter, and divide with separately the external world and be communicated with, be formed with pressure separately.
The internal surface of the cylinder barrel 2 in the utility model has than higher degree of finish, and the outer surface of piston 3 also has than higher degree of finish, and the seal action of piston packing 15 is arranged again, and piston 3 seals when mobile in cylinder barrel 2.The outer surface of upper piston rod 4 and lower piston rod 13 also has than higher degree of finish, and the bore area of cylinder barrel short circuit 5 also has than higher degree of finish, and the seal action of rod seal circle 6 is arranged again, guarantees equally to seal when mobile.
When the propulsion device in the utility model is higher than perimeter pressure at the pressure when inner region, the pressure of inner region acts on the area of the upper end face of three pistons 3 respectively, propulsion device inside this moment movably three pistons 3 and upper piston rod 4, lower piston rod 13 stressed moving down make lower piston rod 13 stretch downwards.
When the pressure of perimeter is higher than inner region, the area of external pressure action is the rear surface area of three pistons 3, piston 3, upper piston rod 4, lower piston rod 13 up move at this moment, lower piston rod 13 is upwards regained, moved up and down thereby can drive the parts that drive by propulsion device.
As the above analysis, propulsion device in the utility model is three grades of piston structures, the area that external pressure acted on is the rear surface area sum of three pistons 3 substantially, in like manner, when increasing the quantity of cylinder barrel 2, piston 3, upper piston rod 4, cylinder barrel short circuit 5, the corresponding increase of the progression of the oil hydraulic cylinder of formed perimeter, the also corresponding increase of ouput force.Thereby the utility model can be extended to the multi-level piston structure, then the area that external pressure acted on is a plurality of piston end face surface sum substantially, so progression is many more, the gross area of effect is big more, and is also just big more in the resulting ouput force in the lower end of lower piston rod 13.
Compare with present common oil hydraulic cylinder, under the diameter of piston 3 condition identical with pressure, the area that pressure acted on is than the big several times of area of common oil hydraulic cylinder, the also big several times of resulting ouput force on the lower piston rod 13.In like manner, require under the identical condition in resulting ouput force on the piston 3, external pressure can reduce several times.
In addition, propulsion device in the utility model is a counterbore 1300 in lower piston rod 13 inside, near the lower end surface of the position of side perforation 1302 cylinder barrel short circuit 5 below, by cylinder barrel short circuit 5 lower end surfaces, cylinder barrel 2 inside, the annular space that following box cupling 11 upper-end surfaces and lower piston rod 13 outsides form seals, so whole piston guarantees not reveal in this annular space, when the side perforation 1302 that is moved down into lower piston rod 13 when piston is lower than down box cupling 11 lower end surfaces, the internal high pressure liquid of whole piston is revealed through the perforation of lower piston rod 13 sides, whole piston no longer moves down, at this moment, the pressure of external pressure chamber is greater than the pressure of internal pressure chamber, upwards promote the lower end of piston 3, whole piston is pushed back original state, can repeat said process then, so can make the distance that moves under the propulsion device is a definite distance, promptly as long as when descent of piston exceeds the lower end surface that perforation 1302 walks to following box cupling 11, can realize deciding the function of journey pressure release, thereby when well workover is constructed, just can very clearly know that from ground down-hole actual working pressure and construction section finish, make and utilize hydraulic method to realize that oil well casing Deformation Repair technology becomes possibility.
Embodiment two
As shown in Figure 6 and Figure 7, structure among structure in the present embodiment two and the embodiment one is basic identical, and having same structure is illustrated by identical label with the parts of function, therefore explanation no longer separately, its difference is, rod seal circle gland 7 among the embodiment one and bolt 8 are equipped with cap 18 by sealing and fixing ring 17 and locking and substitute, and can play fixing sealed function equally.Wherein sealing and fixing ring 18 is that an inside is the original shape hole, the outside is the loop configuration of Full Thread FT, it is tightened on down on the internal thread 112 of box cupling 11 lower ends, rod seal ring 6 is compressed, it is the annular solids that inside is screw thread that locking is equipped with cap 18, it is screwed on the outside thread of sealing and fixing ring 17, and assurance sealing and fixing ring 18 is not threaded off.
Embodiment three
As Fig. 8 and shown in Figure 9, structure among structure in the present embodiment three and the embodiment one is basic identical, and having same structure is illustrated by identical label with the parts of function, therefore explanation no longer separately, its difference is, lower piston rod 13 is not provided with counterbore 1300 and perforation 1302 in the present embodiment, saves bottom cylinder barrel 2 and following box cupling 11 simultaneously, directly by cylinder barrel short circuit 5 structures yet.Though the propulsion device in the present embodiment three has saved a cylinder barrel 1 and following box cupling 11, bottom directly by cylinder barrel short circuit 5 fixing seals, but also saved the function of deciding the journey pressure release, but still can realize this practical obstructed inside and outside pipeline of control that do not have, and realized the purpose of plural serial stage by internal structure.In addition, the cylinder barrel short circuit 5 that is used for bottom also can be simplified some procedures, as saves outside thread, the internal thread of lower end, and a straight hole directly can be processed in hole 507,508.
Claims (9)
1. multistage internal series-connection formula hydraulic pusher, it is characterized in that, it includes the lower piston rod that is used for the upper connection that is connected with described propulsion device top miscellaneous part, two or more cylinder barrel, two or more piston, at least one upper piston rod, two or more cylinder barrel short circuit and is used to connect described propulsion device lower part, wherein:
Described cylinder barrel and described cylinder barrel short circuit are provided with at interval successively and are sealedly connected and fixed and form the middle part and have and be used to the straight-bar in hole all, cylinder barrel end sealing at described straight-bar top connects described upper connection, described straight-bar be used to all in the hole from the top be provided with described piston and the upper piston rod that sealing and fixing links into an integrated entity at interval to the bottom, the sealing that described each piston can slide up and down is arranged on the top of each corresponding cylinder barrel short circuit, described upper piston rod and sealing simultaneously slided and passed the cylinder barrel short circuit of described correspondence, the lower end of the piston below the described lower piston rod that directly is sealedly and fixedly connected, described lower piston rod sealing is slided and is extended described cylinder barrel short circuit bottom, lower end surface at described piston, the upper-end surface of cylinder barrel short circuit, the internal face of cylinder barrel, being formed with one or more between the outer wall of upper piston rod or lower piston rod is not communicated with but the external pressure chamber that is in communication with the outside respectively mutually, simultaneously in described upper connection, piston, be formed with an internal pressure chamber that is in communication with the outside by described upper connection between cylinder barrel short circuit and the upper piston rod, described internal pressure chamber is not communicated with mutually with described external pressure chamber.
2. multistage internal series-connection formula hydraulic pusher according to claim 1, it is characterized in that, the centre of described cylinder barrel short circuit is provided with the endoporus that supplies described upper piston rod or lower piston rod to pass, be provided with in outer wall and be used for the outside thread that is tightly connected with described cylinder barrel, described cylinder barrel short circuit is provided with the hole that is used to be communicated with described external pressure chamber and external pressure feeding mechanism simultaneously.
3. multistage internal series-connection formula hydraulic pusher according to claim 2 is characterized in that, the hole that being used to of being provided with on the described cylinder barrel short circuit is communicated with described external pressure chamber and external pressure feeding mechanism is two, and vertical connection mutually.
4. multistage internal series-connection formula hydraulic pusher according to claim 2 is characterized in that, described cylinder barrel short circuit is dynamically connected via rod seal ring, rod seal circle gland and bolt and described upper piston rod or lower piston rod sealed sliding.
5. multistage internal series-connection formula hydraulic pusher according to claim 1 is characterized in that, is sealedly and fixedly connected by screw thread, seal ring between described piston and described upper piston rod, the described lower piston rod.
6. multistage internal series-connection formula hydraulic pusher according to claim 5, it is characterized in that, the bottom of described upper piston rod is provided with and is communicated with the inside and outside perforation of described upper piston rod, described internal pressure chamber is interconnected by through hole that is provided with respectively in the middle part of described piston, the upper piston rod and the perforation on the described upper piston rod sidewall, and is communicated with the internal pressure feeding mechanism by the through hole of described upper connection.
7. multistage internal series-connection formula hydraulic pusher according to claim 1, it is characterized in that, the middle part of described lower piston rod is provided with counterbore, be provided with the perforation that is communicated with inside and outside the described lower piston rod in the bottom of described counterbore, connect at described cylinder barrel short circuit lower seal below simultaneously and be used to control cylinder barrel and the following box cupling that described internal pressure chamber decide the journey pressure release.
8. multistage internal series-connection formula hydraulic pusher according to claim 7 is characterized in that, between described down box cupling and the described lower piston rod by rod seal ring and sealing steel rings slipper seal.
9. multistage internal series-connection formula hydraulic pusher according to claim 1 is characterized in that, between described inner wall of cylinder and the described piston by piston packing ring gland and piston packing ring slipper seal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201506636U CN201502580U (en) | 2009-05-18 | 2009-05-18 | Multilevel internal tandem hydraulic pusher |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201506636U CN201502580U (en) | 2009-05-18 | 2009-05-18 | Multilevel internal tandem hydraulic pusher |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201502580U true CN201502580U (en) | 2010-06-09 |
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ID=42453514
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201506636U Expired - Lifetime CN201502580U (en) | 2009-05-18 | 2009-05-18 | Multilevel internal tandem hydraulic pusher |
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| Country | Link |
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| CN (1) | CN201502580U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104832491A (en) * | 2015-05-26 | 2015-08-12 | 张晓义 | Multistage hydraulic cylinder inside serial connection type drawing device |
| CN106321002A (en) * | 2016-09-12 | 2017-01-11 | 西安物华巨能爆破器材有限责任公司 | Driving device and driving method for hydraulic multiplying of bridge plug tool |
-
2009
- 2009-05-18 CN CN2009201506636U patent/CN201502580U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104832491A (en) * | 2015-05-26 | 2015-08-12 | 张晓义 | Multistage hydraulic cylinder inside serial connection type drawing device |
| CN106321002A (en) * | 2016-09-12 | 2017-01-11 | 西安物华巨能爆破器材有限责任公司 | Driving device and driving method for hydraulic multiplying of bridge plug tool |
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| GR01 | Patent grant | ||
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Granted publication date: 20100609 |
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| CX01 | Expiry of patent term |