CN102927078B - A kind of hydraulic jack and there is its pumping mechanism, engineering machinery - Google Patents
A kind of hydraulic jack and there is its pumping mechanism, engineering machinery Download PDFInfo
- Publication number
- CN102927078B CN102927078B CN201210428529.4A CN201210428529A CN102927078B CN 102927078 B CN102927078 B CN 102927078B CN 201210428529 A CN201210428529 A CN 201210428529A CN 102927078 B CN102927078 B CN 102927078B
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- cylinder barrel
- hydraulic jack
- end cap
- spacing
- moving bar
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Abstract
The invention discloses a kind of hydraulic jack, comprise cylinder barrel, moving bar piece, the first end cap and the second end cap, also comprise and be located at limiting piston in cylinder barrel and spacing cylinder barrel, spacing cylinder barrel is hollow structure, itself and cylinder barrel are coaxially arranged, and one end is fixed on described second end cap, moving bar piece is provided with the accommodating cavity for accommodating spacing cylinder barrel near the end of the second end cap; Limiting piston slides and is arranged between cylinder barrel and spacing cylinder barrel, and forms independently spacing chamber with cylinder barrel, spacing cylinder barrel, the second end cap; Second end cap is provided with and the spacing hydraulic fluid port of spacing chamber and the main hydraulic fluid port that is communicated with the center cavity of spacing cylinder barrel.This hydraulic jack stroke can adjust as required, it for some engineering machinery operation or safeguard can provide great convenience.The invention allows for a kind of pumping mechanism and the engineering machinery with this hydraulic jack.
Description
Technical field
The present invention relates to technical field of hydraulic pressure, in particular to a kind of hydraulic jack and pumping mechanism, the engineering machinery with this hydraulic jack.
Background technique
Hydraulic jack is a kind of conventional hydraulic actuator, and can be straight line motion by hydraulic energy transfer, it be extensive at the Application comparison of engineering machinery field.As shown in Figure 1, generally speaking, hydraulic jack comprises cylinder barrel 51, piston 53, piston rod 52 and end cap 54, and under the ordering about of hydraulic oil, piston driving piston rod slides relative to cylinder barrel.This oil cylinder only has a stroke L usually, and namely the mobilizable scope of piston rod can not adjust as required, and this makes troubles to the operation of engineering machinery under some special status of this kind of oil cylinder of application or maintenance.For concrete pumping equipment, the pumping mechanism on concrete pumping equipment comprises conveying cylinder 41, concrete piston 42, water tank 43, connecting rod 46 and hydraulic jack 44, with reference to figure 2; Pumping mechanism is when changing concrete piston, and need first to be removed by connecting rod 46, then crawl operated piston bar 45 advances, and makes piston rod 45 near concrete piston 42, then by piston rod 45 directly and concrete piston 42 be linked together, as shown in Figure 3; Last crawl operated piston bar 45 retreats, and makes concrete piston 42 be retracted in water tank 43, as shown in Figure 4; Install by above-mentioned inverse process again after having torn open, it is very inconvenient to operate, and needs the time long.
In sum, propose the adjustable hydraulic jack of a kind of stroke, be still those skilled in the art's technical problem urgently to be resolved hurrily with the operation or maintenance that facilitate relevant device.
Summary of the invention
In view of this, the present invention proposes a kind of hydraulic jack and has pumping mechanism, the engineering machinery of this hydraulic jack, causes the operation of relevant device or problem difficult in maintenance to solve because hydraulic jack stroke is unadjustable.
On the one hand, the invention provides a kind of hydraulic jack, comprise cylinder barrel, the moving bar piece be arranged in described cylinder barrel is slided in one end, the two ends of cylinder barrel are respectively equipped with the first end cap and the second end cap, and the other end of described moving bar piece is through described first end cap;
Also comprise and be located at limiting piston in described cylinder barrel and spacing cylinder barrel, described spacing cylinder barrel is hollow structure, itself and described cylinder barrel are coaxially arranged, and one end is fixed on described second end cap, and described moving bar piece is provided with the accommodating cavity for accommodating described spacing cylinder barrel near the end of the second end cap;
Described limiting piston slides and is arranged between cylinder barrel and spacing cylinder barrel, and forms independently spacing chamber with described cylinder barrel, spacing cylinder barrel, the second end cap, for adjusting the effective travel of described moving bar piece;
Described second end cap is provided with and the spacing hydraulic fluid port of described spacing chamber and the main hydraulic fluid port that is communicated with the center cavity of described spacing cylinder barrel;
Described accommodating cavity is circular groove, the supporting portion that the end of described moving bar piece is divided into mandrel and slidably coordinates with described cylinder barrel inner peripheral surface by described circular groove, under predetermined state, described mandrel outer circumferential face coordinates with spacing cylinder barrel inner peripheral surface and forms annular damping hole, and described annular damping hole is for alleviating the impact of described supporting portion and described limiting piston;
Described mandrel outer circumferential face is provided with the first annular relief near described second end caps, described spacing cylinder barrel inner peripheral surface is provided with the second annular relief near the first end caps, described first annular relief and the second annular relief form annular damping hole under predetermined state, and described annular damping hole is for alleviating the impact of described supporting portion and described limiting piston.
Further, described mandrel is provided with one-way flow valve, and the import of described one-way flow valve is opened in described mandrel on the end face of one end of described second end cap, and the outlet of described one-way flow valve is opened on the outer circumferential face of described mandrel.
Further, the one end away from described second end cap on described mandrel is located in the outlet of described one-way flow valve.
Further, described spacing cylinder barrel is provided with limited part away from the end of the second end cap, and described limited part is used for preventing described limiting piston from skidding off described spacing cylinder barrel.
Further, described spacing cylinder barrel and described second end cap are bolted.
The present invention propose hydraulic jack there is the adjustable limiting piston in a position, in the application, the stroke of hydraulic jack can be adjusted by the position adjusting this limiting piston, therefore it for some engineering machinery operation or safeguard can provide great convenience.In further technological scheme, by arranging annular damping hole, when making the moving bar piece of this oil cylinder be about to the position running to limiting piston, hydraulic oil can only be discharged by annular damping hole, the resistance that annular damping hole produces makes the motion speed of moving bar piece reduce, thus reaches the object of the impact alleviating supporting part and limiting piston.
On the other hand, the present invention also provides a kind of pumping mechanism, comprise conveying cylinder, concrete piston, water tank and hydraulic jack, described hydraulic jack is the hydraulic jack described in above-mentioned any one, described water tank is located between described conveying cylinder and described hydraulic jack, moving bar piece one end of described hydraulic jack is passed described water tank and is connected with described concrete piston, described hydraulic jack at least has the first stroke state and the second stroke state, for performing pumpdown when described hydraulic jack is in the first stroke state, described hydraulic jack moves back the operation of concrete piston for performing when being in the second stroke state.Because this hydraulic jack at least has two strokes, i.e. the first stroke and the second stroke, under the first stroke state, this hydraulic jack is used for pumpdown, and under the second stroke state, this hydraulic jack is used for moving back the operation of concrete piston.When moving back concrete piston, first hydraulic jack is adjusted to the second stroke state by the first stroke state, control piston bar retreats again, until concrete piston retreats in water tank, then change concrete piston, this shows that the operation of this pumping mechanism replacing concrete piston is simply more than existing pumping mechanism.
Another aspect, the present invention also provides a kind of engineering machinery, and described engineering machinery has the hydraulic jack described in above-mentioned any one.
Further, described engineering machinery is concrete pumping equipment.
The engineering machinery that the present invention proposes has the hydraulic jack described in above-mentioned any one, and the use of this hydraulic jack makes the operation of this project machinery more convenient, safeguards more convenient.In further technological scheme, by arranging annular damping hole in hydraulic jack, not only can alleviate the impact between hydraulic jack inner member, alleviating the noise and vibration causing whole engineering machinery to produce by this kind of impact simultaneously.
Accompanying drawing explanation
The accompanying drawing forming a part of the present invention is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the structural representation of hydraulic jack in correlation technique;
Fig. 2 is the structural representation of pumping mechanism in correlation technique;
Fig. 3 to dismantle the schematic diagram after connecting rod for the pumping mechanism shown in Fig. 2 in maintenance process;
The concrete piston that Fig. 4 is the pumping mechanism shown in Fig. 2 is retracted into the schematic diagram in water tank;
Fig. 5 is the structural representation of the hydraulic jack that the embodiment of the present invention proposes;
The schematic diagram under predetermined state that Fig. 6 is hydraulic jack shown in Fig. 5;
Fig. 7 is the enlarged view at A place in Fig. 6;
The schematic diagram of pumping mechanism under the first stroke state that Fig. 8 provides for the embodiment of the present invention;
Fig. 9 is the schematic diagram of pumping mechanism shown in Fig. 8 under the second stroke state.
Embodiment
It should be noted that, when not conflicting, the embodiment in the present invention and the feature in embodiment can combine mutually.Below in conjunction with accompanying drawing 5 to Fig. 9, specific embodiments of the invention are described in detail.
Fig. 5 is the structural representation of the hydraulic jack that the embodiment of the present invention proposes; The schematic diagram under predetermined state that Fig. 6 is hydraulic jack shown in Fig. 5; Fig. 7 is the enlarged view at A place in Fig. 6; The schematic diagram of pumping mechanism under the first stroke state that Fig. 8 provides for the embodiment of the present invention; Fig. 9 is the schematic diagram of pumping mechanism shown in Fig. 8 under the second stroke state.
The operation of engineering machinery or problem difficult in maintenance is caused because hydraulic jack stroke is unadjustable for solving, embodiments provide a kind of hydraulic jack, comprise cylinder barrel 2, slide the moving bar piece 1 be arranged in described cylinder barrel 2 in one end, the two ends of cylinder barrel 2 are respectively equipped with the first end cap 6 and the second end cap 10, the other end of described moving bar piece 1 is through described first end cap 6, this hydraulic jack also comprises is located at limiting piston 4 in described cylinder barrel 2 and spacing cylinder barrel 9, described spacing cylinder barrel 9 is hollow structure, itself and described cylinder barrel 2 are coaxially arranged, and one end is fixed on described second end cap 10, described moving bar piece 1 is provided with the accommodating cavity for accommodating described spacing cylinder barrel 9 near the end of the second end cap 10, and be provided with gap between described spacing cylinder barrel 9 and described accommodating cavity, described limiting piston 4 slides and is arranged between cylinder barrel 2 and spacing cylinder barrel 9, and with described cylinder barrel 2, spacing cylinder barrel 9, second end cap 10 forms independently spacing chamber 5, for adjusting the effective travel of described moving bar piece 1, described second end cap 10 is provided with the spacing hydraulic fluid port 12 be communicated with described spacing chamber 5 and the main hydraulic fluid port 13 be communicated with the center cavity of described spacing cylinder barrel 9.Compared with the hydraulic jack shown in Fig. 1, the moving bar piece 1 in this hydraulic jack can be understood as one and is similar to the assembly be made up of piston and piston rod, and the one end unlike this rod member has the accommodating cavity that can hold spacing cylinder barrel.Here accommodating cavity can be cross section be circular cavity also can be cross section is the circular groove 7 of annular, as long as this spacing cylinder barrel 9 can pass in and out smoothly.In addition, by spacing hydraulic fluid port 12 and main hydraulic fluid port 13 being opened on the second end cap 10, decrease the quantity offering hydraulic fluid port on cylinder barrel 2, make the processing of cylinder barrel 2 and sealing easier.Here main hydraulic fluid port 13 for hydraulic jack work time, as the communication port of the hydraulic oil of power source, another main hydraulic fluid port 11 can be located on the first end cap 6.
This hydraulic jack makes the effective travel of hydraulic jack to adjust as required by the limiting piston 4 that setting position is adjustable, in use, as needs extend effective travel, hydraulic oil in spacing chamber 5 can be released a part direction of limiting piston 4 toward the second end cap 10 can be moved, the removable length of moving bar piece 1 is extended, so just can extend the effective travel of this hydraulic jack; Otherwise, then its effective travel is shortened.
In further technological scheme, described accommodating cavity is circular groove 7, the supporting portion 3 that the end of described moving bar piece 1 is divided into mandrel 8 and slidably coordinates with described cylinder barrel 2 inner peripheral surface by described circular groove 7, under predetermined state, described mandrel 8 outer circumferential face coordinates with spacing cylinder barrel 9 inner peripheral surface and forms annular damping hole 30, and described annular damping hole 30 is for alleviating the impact of described supporting portion 3 and described limiting piston 4.Here predetermined state refers at moving bar piece 1 toward in the second end cap 10 direction movement process, state when supporting portion 3 is about to contact with limiting piston 4 residing for hydraulic jack.In this technological scheme, hydraulic jack can form annular damping hole 30 before supporting portion 3 contacts with limiting piston 4, annular damping hole 30 produces resistance when the hydraulic oil in circular groove 7 is flowed out, thus slow down the motion speed of moving bar piece 1, therefore, this technological scheme effectively can alleviate the impact of supporting portion 3 and limiting piston 4.
In further technological scheme, described accommodating cavity is circular groove 7, the supporting portion 3 that the end of described moving bar piece 1 is divided into mandrel 8 and slidably coordinates with described cylinder barrel inner peripheral surface by described circular groove 7, described mandrel 8 outer circumferential face is provided with the first annular relief 32 near described second end cap 10 place, described spacing cylinder barrel 9 inner peripheral surface is provided with the second annular relief 31 near the first end cap 6 place, described first annular relief 32 and the second annular relief 31 for forming annular damping hole 30 under predetermined state, described annular damping hole 30 is for alleviating the impact of described supporting portion 3 and described limiting piston 4.Here predetermined state refers in the process of moving toward the second end cap direction at moving bar piece 1, and state when supporting portion 3 is about to contact with limiting piston 4 residing for hydraulic jack, can with reference to figure 6.This technological scheme can bring the benefit of two aspects: 1) hydraulic jack can form annular damping hole 30 before supporting portion 3 contacts with limiting piston 4, annular damping hole 30 produces resistance when the hydraulic oil in circular groove is flowed out, thus slow down the motion speed of moving bar piece 1, therefore, this technological scheme effectively can alleviate the impact of supporting portion 3 and limiting piston 4; 2) when the first annular relief 32 crosses the mating area with the second annular relief 31, (supporting portion 3 contacts rear continuation with limiting piston 4 and moves toward the direction of the second end cap 10, when first annular relief and the second annular relief cannot form annular damping hole), because of the resistance not having annular damping hole to produce, resistance when hydraulic oil in circular groove 7 flows out diminishes, therefore, the operation of moving bar piece 1 is faster, laborsaving.
In further technological scheme, described mandrel 8 is provided with one-way flow valve 14, the import of described one-way flow valve 14 is opened in described mandrel 8 on the end face of one end of described second end cap 10, and the outlet of described one-way flow valve 14 is opened on the outer circumferential face of described mandrel 8.
In further technological scheme, the outlet of described one-way flow valve 14 is located on described mandrel 8 away from the outer circumferential face of one end of described second end cap 10.In this technological scheme, when hydraulic oil enters from main hydraulic fluid port 13, when driving described moving bar piece 1 toward the first end cap 6 direction motion, hydraulic oil can enter in circular groove 7 by one-way flow valve 14, add the area of contact of hydraulic oil and moving bar piece 1, the speed of response of moving bar piece 1 when starting can be promoted, and reduce the pressure of the hydraulic oil needed when starting.
In further technological scheme, described spacing cylinder barrel 9 is provided with limited part away from the end of the second end cap 10, and described limited part is used for preventing described limiting piston 4 from skidding off described spacing cylinder barrel 9.
In further technological scheme, described spacing cylinder barrel 9 is bolted with described second end cap 10.
Please refer to Fig. 8 and Fig. 9, the embodiment of the present invention additionally provides a kind of pumping mechanism, for pumping fluid, comprise conveying cylinder 21, concrete piston 22, water tank 23 and hydraulic jack 24, this hydraulic jack 24 adopts said structure, this hydraulic jack 24 at least has L1 and L2 two strokes, and hydraulic jack 24 is in for performing pumpdown when stroke is the state of L1, and hydraulic jack 24 is in when stroke is the state of L2 and moves back the operation of concrete piston for performing.
The specific works principle of this pumping mechanism is as follows:
1) pumpdown: the limiting piston 4 of hydraulic jack 24 is placed in predetermined restraining position, now the stroke of hydraulic jack 24 is L1, moving bar piece 1 drives concrete piston 22 to-and-fro motion in conveying cylinder 21 under the effect of the hydraulic oil alternately flowed into from main hydraulic fluid port 11 and 13, and fluid completes the process sucking and pump in the reciprocatory movement of concrete piston.
2) move back the operation of concrete piston: be communicated with fuel tank by spacing hydraulic fluid port 12, hydraulic oil enters from main hydraulic fluid port 11, and under hydraulic fluid pressure effect, moving bar piece 1 promotes limiting piston 4 and retreats to precalculated position, and now the stroke of hydraulic jack 24 is L2.Promote in the process of limiting piston 4 retrogressing at moving bar piece 1, concrete piston 22 is drawn out conveying cylinder 21 under the effect of moving bar piece 1, and arrives in water tank 23.
As can be seen from the above-mentioned working principle of this pumping mechanism, when changing concrete piston 22, first spacing hydraulic fluid port 12 is communicated with fuel tank, then controls moving bar piece 1 and retreat, until concrete piston 22 retreats in water tank 23, then replacing concrete piston 22.Compared with existing pumping mechanism, the operation that this pumping mechanism changes concrete piston wants simple many.
The embodiment of the present invention additionally provides a kind of engineering machinery, and this project machinery has the hydraulic jack described in above-mentioned any one.This project machinery can be concrete pumping equipment, and as concrete mixer, towed concrete pump etc., the employing of this hydraulic jack, brings great convenience to the operation of this type of engineering machinery and maintenance.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a hydraulic jack, comprise cylinder barrel (2), the moving bar piece (1) be arranged in described cylinder barrel is slided in one end, the two ends of cylinder barrel (2) are respectively equipped with the first end cap (6) and the second end cap (10), the other end of described moving bar piece (1) is through described first end cap (6), it is characterized in that, also comprise and be located at limiting piston (4) in described cylinder barrel (2) and spacing cylinder barrel (9);
Described spacing cylinder barrel (9) is hollow structure, itself and described cylinder barrel (2) are coaxially arranged, and one end is fixed on described second end cap (10), described moving bar piece (1) is provided with the accommodating cavity for accommodating described spacing cylinder barrel (9) near the end of the second end cap (10);
Described limiting piston (4) slides and is arranged between cylinder barrel (2) and spacing cylinder barrel (9), and form independently spacing chamber (5), for adjusting the effective travel of described moving bar piece (1) with described cylinder barrel (2), spacing cylinder barrel (9), the second end cap (10);
Described second end cap (10) is provided with the spacing hydraulic fluid port (12) be communicated with described spacing chamber (5) and the main hydraulic fluid port (13) be communicated with the center cavity of described spacing cylinder barrel;
Described accommodating cavity is circular groove (7), the supporting portion (3) that the end of described moving bar piece (1) is divided into mandrel (8) and slidably coordinates with described cylinder barrel (2) inner peripheral surface by described circular groove (7), under predetermined state, described mandrel (8) outer circumferential face coordinates with spacing cylinder barrel (9) inner peripheral surface and forms annular damping hole (30), and described annular damping hole (30) is for alleviating the impact of described supporting portion (3) and described limiting piston (4);
Described mandrel (8) outer circumferential face is provided with the first annular relief (32) near described second end cap (10) place, described spacing cylinder barrel (9) inner peripheral surface is provided with the second annular relief (31) near the first end cap (6) place, and described first annular relief (32) and the second annular relief (31) form annular damping hole (30) under predetermined state.
2. hydraulic jack according to claim 1, it is characterized in that, described mandrel (8) is provided with one-way flow valve (14), the import of described one-way flow valve (14) is opened in described mandrel (8) on the end face of one end of described second end cap (10), and the outlet of described one-way flow valve (14) is opened on the outer circumferential face of described mandrel (8).
3. hydraulic jack according to claim 2, is characterized in that, the one end away from described second end cap (10) on described mandrel (8) is located in the outlet of described one-way flow valve (14).
4. hydraulic jack according to claim 3, it is characterized in that, described spacing cylinder barrel (9) is provided with limited part away from the end of the second end cap (10), and described limited part is used for preventing described limiting piston (4) from skidding off described spacing cylinder barrel (9).
5. hydraulic jack according to claim 3, is characterized in that, described spacing cylinder barrel (9) and described second end cap (10) are bolted.
6. a pumping mechanism, comprise conveying cylinder (21), concrete piston (22), water tank (23) and hydraulic jack (24), it is characterized in that, described hydraulic jack (24) is the hydraulic jack described in any one of claim 1 to 5, described water tank (23) is located between described conveying cylinder (21) and described hydraulic jack (24), moving bar piece (1) one end of described hydraulic jack (24) is passed described water tank (23) and is connected with described concrete piston (22), described hydraulic jack (24) at least has the first stroke state and the second stroke state, for performing pumpdown when described hydraulic jack is in the first stroke state, described hydraulic jack moves back the operation of concrete piston for performing when being in the second stroke state.
7. an engineering machinery, is characterized in that, comprises the hydraulic jack described in any one of claim 1 to 5.
8. engineering machinery according to claim 7, is characterized in that, described engineering machinery is concrete pumping equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210428529.4A CN102927078B (en) | 2012-10-31 | 2012-10-31 | A kind of hydraulic jack and there is its pumping mechanism, engineering machinery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210428529.4A CN102927078B (en) | 2012-10-31 | 2012-10-31 | A kind of hydraulic jack and there is its pumping mechanism, engineering machinery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102927078A CN102927078A (en) | 2013-02-13 |
| CN102927078B true CN102927078B (en) | 2016-01-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210428529.4A Expired - Fee Related CN102927078B (en) | 2012-10-31 | 2012-10-31 | A kind of hydraulic jack and there is its pumping mechanism, engineering machinery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102927078B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105822620B (en) * | 2015-01-07 | 2018-09-04 | 富阳通力机械制造有限公司 | A kind of stroke limit oil cylinder of very heavy very useful with groove |
| WO2016127382A1 (en) * | 2015-02-13 | 2016-08-18 | National Oilwell Varco Petroleum Equipment (Shanghai) Co., Ltd. | Reciprocating pump |
| CN112832528B (en) * | 2020-08-12 | 2022-04-26 | 中联重科股份有限公司 | Pumping control method and device, material distribution method and device and material distribution equipment |
| CN112248500A (en) * | 2020-09-30 | 2021-01-22 | 南通锻压设备如皋有限公司 | Hybrid drive punching machine |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1213357B (en) * | 1986-10-13 | 1989-12-20 | Afros Spa | COAXIAL PISTON PUMPING UNIT. |
| DE19727103A1 (en) * | 1997-06-26 | 1999-01-07 | Putzmeister Ag | Piston pump for thick matter |
| CN2881144Y (en) * | 2005-12-26 | 2007-03-21 | 中集车辆（集团）有限公司 | Pumping structure capable of easy changing concrete piston |
| CN201310456Y (en) * | 2008-11-13 | 2009-09-16 | 福田雷沃重机股份有限公司 | Oil cylinder and concrete mixer for rapidly replacing concrete piston |
| CN201486790U (en) * | 2009-08-10 | 2010-05-26 | 福田雷沃重机股份有限公司 | Pumping mechanism capable of changing strokes and pump vehicle provided therewith |
| CN101705928A (en) * | 2009-12-01 | 2010-05-12 | 北汽福田汽车股份有限公司 | Concrete transfer pump |
| CN201851298U (en) * | 2010-03-16 | 2011-06-01 | 三一重工股份有限公司 | Concrete pumping structure |
| CN101776053B (en) * | 2010-03-16 | 2012-09-05 | 三一重工股份有限公司 | Concrete pumping structure |
| CN201908886U (en) * | 2010-12-28 | 2011-07-27 | 三一重工股份有限公司 | Engineering machine and hydraulic oil cylinder thereof |
| CN102588241B (en) * | 2011-10-14 | 2015-01-14 | 三一汽车制造有限公司 | Concrete pump and pumping mechanism thereof |
| CN202690570U (en) * | 2012-05-30 | 2013-01-23 | 三一重工股份有限公司 | Hydraulic cylinder, hydraulic circuit, material pumping system and engineering machinery |
-
2012
- 2012-10-31 CN CN201210428529.4A patent/CN102927078B/en not_active Expired - Fee Related
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