CN104210408A - Combined hydraulic lifting machine - Google Patents
Combined hydraulic lifting machine Download PDFInfo
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- CN104210408A CN104210408A CN201410453117.5A CN201410453117A CN104210408A CN 104210408 A CN104210408 A CN 104210408A CN 201410453117 A CN201410453117 A CN 201410453117A CN 104210408 A CN104210408 A CN 104210408A
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Abstract
The invention discloses a combined hydraulic lifting machine, which is used for solving the technical problem of how to expand the oil storage space of an oil tank under the situation that the structure is kept compact. The combined hydraulic lifting machine comprises an integral base, wherein an oil cylinder and an oil pump are arranged on the base, the oil cylinder and the oil pump are communicated through an oil path, the oil path is installed and arranged in the base, one side surface of the base is provided with an oil storage groove, the oil pump is fixedly arranged above the oil storage groove to enable the oil pump and the oil storage groove to form a sealed first oil storage chamber, the same side surface of the base is further provided with a first fixing groove and a second fixing groove, the lower end of the cylinder body of the oil cylinder is fixedly arranged in the first fixing groove, and a sleeve with inner diameter which is larger than the outer diameter of the cylinder body of the oil cylinder is sheathed outside the cylinder body of the oil cylinder to enable the cylinder body of the oil cylinder and the sleeve to form a second oil storage chamber. The combined hydraulic lifting machine has the features that the oil storage space of the oil tank is expanded and the original structure is kept compact at the same time.
Description
Technical field
The present invention relates to lifting machine field, be specially a kind of hydraulic combined lifting machine, particularly a kind of as the lifting machine on the light-duty dumping cars such as gasoline motor-tricycle, electric motorcycle tricycle, compact tractor.
Background technology
Lifting machine in the market on the such as light-duty dumping car such as gasoline motor-tricycle, electric motorcycle tricycle, compact tractor is made up of Hydraulic Pump, fuel tank, oil pipe, control cock, oil cylinder usually, the goods on car can be made to unload by this structure.But these parts are all the parts of independent dispersion, these scattered parts are assembled and is fixed on to exist after on car body and arrange on the compact cars such as motor-tricycle, be then difficult to dispersion, bulky clumsy arrange.And the connecting portion of each parts is more, add the risk that oil leaks.
Therefore, the formula that is integrated into one by above-mentioned lifting machine and miniaturization are the technology be badly in need of.Retrieve through applicant, the Wang Shuge in Jilin obtains similar combination hydraulic lifting machine patent, the application number 200710055922.2 of this patent, patent name is that " integral type driver's cab turnover is with electronic, hand-hydraulic lifting machine ", specifically disclose integrated type electric pump, manual pump and operating mechanism, change-over valve and operating mechanism, manual pump check valve, one-way throttle valve, hydraulic control one-way valve, follow mechanism, to unblank oil cylinder, sealing member, oil circuit control, all be arranged within a body, elevating ram or can servo-actuated elevating ram, lifting piston, fuel tank, the component integrations such as suspension ring are integrated and are arranged on body, integrated type electric electric motor for pump is arranged on body and forms one-piece construction.The all parts installed at body are all connected by body interior oil circuit.
Applicant thinks after understanding such scheme that this product can not be applicable to the lifting machine of the loading of goods, the application is for Container Loading, need to use more hydraulic oil to drive the stroke of oil cylinder, and the Wang Shuge in Jilin for the opening and closing problem of operator's compartment internal lock, stroke is very short.Therefore the driving oil needed is few, and fuel tank can do less.And once be applied in the application, how to deposit more driving oil and do not affect the compact conformation of this lifting machine, it is insoluble technical matters that miniaturizations etc. require.
Summary of the invention
The object of the application is to provide a kind of knockdown hydraulic jack, and its technical matters to be solved is: how to ensure enough driving oil under the prerequisite of and miniaturization compact at holding structure and store for hydraulic oil cylinder driving.
The present invention is realized by following technical proposal: the present invention by the following technical solutions: a kind of combination hydraulic lifting machine, comprise the base of integral type, base is provided with oil cylinder and oil pump, be communicated with by oil circuit between oil cylinder and oil pump, described oil circuit is all mounted in base, it is characterized in that, one side of described base is provided with oil storage grooves, described oil pump is fixed on above oil storage grooves and makes oil pump and oil storage grooves form the first shoe cream room of sealing, the same side of base is also provided with the first fixed groove and the second fixed groove, the cylinder body lower end of described oil cylinder is fixed in the first fixed groove, the sleeve having an internal diameter larger than cylinder block external diameter at described cylinder block overcoat makes to form the second shoe cream room between cylinder block and sleeve, base is also provided with the interface channel being communicated with oil storage grooves and the second shoe cream room, the lower end of described sleeve to be fixed in the second fixed groove and to be connected with base seal, the upper end of cylinder block is stretched out sleeve and between cylinder block and sleeve, is connected jam nut and cylinder block upper end and sleeve fixed and is formed to seal.
As further improvement, the upper end of described sleeve is the throat structure that end is formed to in-flanges, described jam nut outer peripheral face has flange and be provided with packing seal between flange and flange, and when jam nut is locked, packing seal is pressed on flange lateral surface by flange.
As further improvement, described jam nut inner peripheral surface is stepped hole, be respectively the first hole wall and the second hole wall, described cylinder block upper end has the step outer peripheral face matched with jam nut, be provided with seal ring between first hole wall and cylinder block, be threaded connection with cylinder block in the flange that the second hole wall extend into sleeve.
As further improvement, sleeve is provided with filler port, in described filler port, is plugged with plug cock, described plug cock has the air extractor vent of the connection external world and the second shoe cream room Q2 and in air extractor vent, is provided with the cavernous body preventing fluid from spilling.
As further improvement, the shape of the second described fixed groove is annular, and the outer peripheral face of described sleeve lower end to fix on the outer ring surface of the second fixed groove and arrange delta ring sealing gasket between outer peripheral face and outer ring surface.
As further improvement, described interface channel is L shape, and one end open is arranged on the bottom of the second fixed groove, and other end opening is arranged on the bottom of oil storage grooves.
As further improvement, described sleeve outer wall be provided with evagination hanger and by being welded to connect.
As further improvement, the degree of depth of described oil storage grooves is greater than the height of oil pump, and the bottom of oil pump distance oil storage grooves has a segment distance.As further improvement, described oil circuit comprises oil-feed oil circuit, oil return circuit and safety oil-way, and described oil-feed oil circuit comprises check valve and is arranged on being communicated with oil duct A, B, C, D, E of oil pump and check valve oil inlet and being communicated with oil duct F, G, H, K of one-way valved outlet and cylinder block in base; Described oil return circuit comprises two-position two-way solenoid valve, the import P1 of two-position two-way solenoid valve is communicated with oil duct F, the outlet T of two-position two-way solenoid valve is communicated with shoe cream room Q1, described safety oil-way comprises safety valve, the import of safety valve is communicated with oil duct H, and the outlet of safety valve is communicated with by oil duct S with between oil storage grooves.
Compared with prior art, the present invention has the following advantages: the second shoe cream room is arranged on outside cylinder block by the application, not only expand the space of oil storage, what meet oil cylinder Long Distances uses oily requirement, do not increase the volume of base or increase external fuel tank simultaneously, making this product can keep the feature of miniaturization and compact conformation yet.By the structure design of sleeve, not only increase fuel tank oil storage space and also make fixedly being strengthened of oil cylinder by sleeve and jam nut simultaneously.The application arranges multiple asphalt channel on thinner base, and two-position two-way solenoid valve, check valve is disposed on the same plane, and ensure that oil circuit realizes rear base and has enough intensity.
Accompanying drawing explanation
Fig. 1 is plan structure schematic diagram of the present invention.
Fig. 2 is the sectional structure schematic diagram of A-A in Fig. 1.
Fig. 3 is side-looking structural representation of the present invention.
Fig. 4 is the sectional structure schematic diagram of B-B in Fig. 1.
Fig. 5 is the sectional structure schematic diagram of (i.e. base) after C-C removes all parts in Fig. 1.
Fig. 6 is the sectional structure schematic diagram of (i.e. base) after D-D removes all parts in Fig. 1.
Fig. 7 is oil circuit schematic diagram.
Fig. 8 is the enlarged diagram of part A in Fig. 2.
In figure, base 1; Plane 11; Oil storage grooves 12; First fixed groove 13; Second fixed groove 14; Interface channel 15; Oil pump 2; Import 21; Outlet 22; First shoe cream room Q1; Motor 3; Storage battery 4; Oil cylinder 5; Packing seal 6; Sleeve 7; Flange 71; Hanger 72; Welding 73; Second shoe cream room Q2; Delta ring sealing gasket 8; Jam nut 9; Flange 91; First hole wall 92; Second hole wall 93; Packing seal 011; Oil sealing 012; Check valve 013; Two-position two-way solenoid valve 014; Oil duct A, B, C, D, E, F, G, H, K, M, N, S; Flow regulating valve 015; Safety valve 016; Filtering net 017.
Detailed description of the invention
As depicted in figs. 1 and 2, this knockdown hydraulic jack is an one-piece construction, can be applied on dumping car as light-duty in three-wheel vehicle, motor bike etc., comprise the base 1 of integral type, the bottom surface of base 1 is plane 11, be rectangle in the upper side left-half of base 1 and there is the oil storage grooves 12 surrounded by four pieces of risers, oil pump 2 is fixed on the first shoe cream room Q1 making oil pump 2 and oil storage grooves 12 form sealing above oil storage grooves 12, and be connected above oil pump 2 motor 3 storage battery 4 carried by light-duty vehicle rotate for electric drive motor 3 thus oil pump 2 is worked.The degree of depth of oil storage grooves 12 is greater than the height of oil pump 2, and oil pump 2 has a segment distance apart from the bottom of oil storage grooves 12.This vibrational power flow can make the oil of oil pump 2 that upper strata always can be used better oily, and some impurity can deposit to the stationarity that bottom ensure that driving.
The enlarged drawing of composition graphs 8, right half part on base 1 same side is circular and is provided with the first fixed groove 13 and the second fixed groove 14, first fixed groove 13 is circular and bottom is provided with oil duct K is communicated with (composition graphs 2 and Fig. 5) with the oil duct L of the cylinder body lower end of oil cylinder 5, the cylinder body lower end of oil cylinder 5 to be fixed in the first fixed groove 13 and to arrange packing seal 6 between the cylinder body lower end of oil cylinder 5 and the first fixed groove 13, ensures that oil can not let out the stability ensureing to drive from here by packing seal 6.The sleeve 7 that oil cylinder 5 cylinder body overcoat has an internal diameter larger than oil cylinder 5 cylinder body external diameter makes to form the second shoe cream room Q2 between oil cylinder 5 cylinder body and sleeve 7, base 1 is also provided with the interface channel 15 being communicated with oil storage grooves 12 and the second shoe cream room Q2, interface channel 15 is L shape, one end open is arranged on the bottom of the second fixed groove 14, and other end opening is arranged on the bottom of oil storage grooves 12.By arranging the capacity that the second shoe cream room Q2 can not only expand oil storage in this position, overall installing space can not be taken again, because the oil storage space increased utilizes original installing space, the container that this sleeve 7 is not only as fuel tank uses, use as the support of fixed oil cylinder 5 more, and as shown in Figure 3, sleeve 7 outer wall is provided with evagination hanger 72 and along the welding side seam 73 of evagination hanger 72, the intensity of overcoat is not only made to increase, simultaneously also as the handle portion moving whole lifting machine.First shoe cream room and the second shoe cream room Q2 form the oil storage space of sealing, make oil can not be leaked to outside, increase the service life.
As shown in Figure 2, the lower end of sleeve 7 to be fixed in the second fixed groove 14 and to be tightly connected with base 1, and the upper end of oil cylinder 5 cylinder body is stretched out sleeve 7 and between oil cylinder 5 cylinder body and sleeve 7, connected jam nut and makes oil cylinder 5 cylinder body upper end and sleeve 7 fix and be formed to seal.Specific as follows: the shape of the second fixed groove 14 is annular, the outer peripheral face of described sleeve 7 lower end to fix on the outer ring surface of the second fixed groove 14 and between outer peripheral face and outer ring surface, arranges delta ring sealing gasket 8.The upper end of sleeve 7 is the throat structure that end is formed to in-flanges 71, and jam nut 9 outer peripheral face has flange 91 and be provided with packing seal 011 between flange 91 and flange 71, and when jam nut 9 is locked, packing seal 011 is pressed on flange 71 lateral surface by flange 91.The lateral surface of flange 71 is arc transiting surface, and this arc transiting surface can the structure of arch (bridge) type thus the support strength be increased in when jam nut 9 is locked.Jam nut 9 inner peripheral surface is stepped hole, be respectively the first hole wall 92 and the second hole wall 93, oil cylinder 5 cylinder body upper end has the step outer peripheral face matched with jam nut 9, first hole wall 92 is connected by seal ring with oil cylinder 5 cylinder body, is threaded connection in the flange 71 that the second hole wall 93 extend into sleeve 7 with oil cylinder 5 cylinder body.Ensure that the sealing of the second shoe cream room Q2 by so seal approach, and under the effect of jam nut 9, gasket seal can realize sealing effectiveness more.Sleeve 7 is provided with filler port, drive the position of height lower than filler port of oil, and in filler port, be plugged with plug cock 012, for ensureing that fuel tank is in low-pressure state, plug cock 012 has the air extractor vent of the connection external world and the second shoe cream room Q2 and in air extractor vent, is provided with the cavernous body preventing fluid from spilling.Between plug cock 012 and sleeve 7, be provided with packing seal seal.This structure can ensure that oil leaks and can ensure again to keep shoe cream room to be in low-pressure state, compact conformation, and the intensity affecting sleeve 7 is little.
As shown in Figure 7, be communicated with between oil cylinder 5 and oil pump 2 by oil circuit, oil circuit is all mounted in base 1, comprises oil-feed oil circuit, oil return circuit and safety oil-way.
Composition graphs 4,5,6, oil-feed oil circuit comprises check valve 013 and sees Fig. 6 with the oil pump 2 that is communicated be arranged in base 1 with oil duct A, B, C, D, E(of check valve 013 oil inlet) and be communicated with check valve 013 and export and oil duct F, G, H, K(of oil cylinder 5 cylinder body are shown in Fig. 6 and Fig. 5); Oil pump 2 is electric gear wheel pump, and oil pump 2 import 21 is provided with filtering net 017, and import towards immediately below, prevent impurity from sucking.Oil pump 2 exports 22 and connects oil duct A by seal ring.
Composition graphs 4 and Fig. 7, oil return circuit comprises the two-position two-way solenoid valve 014 be arranged on oil duct F, the import P1 of two-position two-way solenoid valve 014 is communicated with oil duct F, the outlet T of two-position two-way solenoid valve 014 is communicated with shoe cream room Q1, when needs are unloaded, two-position two-way solenoid valve 014 power-off, import P1 ends with outlet T, and the oil of oil duct F enters oil cylinder by piston jack-up by oil duct G, H, K.During reset oil return, import P1 and outlet T conducting, the oil of oil duct F arrives oil duct P by M, N oil duct, then flows in shoe cream room Q1.The two position two-way valve of other structures is also fine.Flow regulating valve 015 is also provided with at the outlet T place of two-position two-way solenoid valve 014.Making oil slowly backflow by arranging flow regulating valve 015, the phenomenon of rapid drawdown can not be produced.
Safety oil-way comprises safety valve 016, and the import of safety valve 016 is communicated with oil duct H, and the outlet of safety valve 016 is communicated with by oil duct S with between oil storage grooves 12.
Principle of work of the present invention is as follows:
1, lifting process, when pressing lifting button, motor 3 driven gear pump rotates, the oil inlet of gear type pump is from oil suction in fuel tank, the high pressure oil flowed out from force feed mouth to enter the front end of check valve 013 by A, B, C, D, E oil duct, the steel ball that high pressure oil backs down check valve 013 enters F oil duct, then is entered in the L hole of oil cylinder 5 cylinder base by G, H, K oil duct, promotes oil cylinder 5 inner carrier and stretches out jack-up container.Spacing when oil cylinder 5 rises is realized by travel switch.Namely container touches the travel switch (not shown) of vehicle frame rear end after rotating to certain angle, and travel switch leads to motor 3 electricity after connecting is cut off, and motor 3 quits work, and oil cylinder 5 no longer rises.If the travel switch of container rear end has been broken under particularity condition, oil cylinder 5 goes up a joint most when rising to end position, because gear type pump is still in work, fluid is constantly had to enter in oil cylinder 5, cause the pressure in oil cylinder 5 constantly to rise, when pressure reaches the pressure of safety valve setting, steel ball 30 is opened, fluid flows out in gap from here, flows in oil pocket Q through P hole.Pressure now in oil cylinder 5 can not raise again, ensure that each part can not damage because of hypertonia.
2, pressure maintaining period, when rising to a certain position and needing to stop, unclamping lifting button and can realize stopping container action, the steel ball 21 in check valve 013 has sealed the fluid in oil cylinder 5, and therefore oil cylinder 5 can not decline, and container Absorbable organic halogens is in a certain position.
3, decline process, when container be raised to certain altitude unload goods need decline time, press decline button, two-position two-way solenoid valve 014 is opened after being energized, fluid in F oil duct enters M, N oil duct by the opening of two-position two-way solenoid valve 014 and flows back in Q1 oil pocket, therefore oil cylinder 5 falls back to initial position under container Action of Gravity Field, completes a working cycle like this.
In addition, except above oil circuit, the oil circuit mentioned in background technology is adopted also to be feasible.
Although schematically illustrating some specific embodiments to illustrate and describing the present invention above, and do not mean that the present invention is only confined to wherein each kind of details.On the contrary, the present invention's spirit can not be departed from the category being equivalent to claims and scope in various details, various amendment is made.The part do not write exactly in specification sheets is general knowledge known in this field, states in detail.
Claims (9)
1. a combination hydraulic lifting machine, comprise the base (1) of integral type, base (1) is provided with oil cylinder (5) and oil pump (2), be communicated with by oil circuit between oil cylinder (5) and oil pump (2), described oil circuit is all mounted in base (1), it is characterized in that, one side of described base (1) is provided with oil storage grooves (12), described oil pump (2) is fixed on oil storage grooves (12) top makes oil pump (2) and oil storage grooves (12) form first shoe cream room (Q1) of sealing, the same side of base (1) is also provided with the first fixed groove (13) and the second fixed groove (14), the cylinder body lower end of described oil cylinder (5) is fixed in the first fixed groove (13), the sleeve (7) having an internal diameter larger than oil cylinder (5) cylinder body external diameter at described oil cylinder (5) cylinder body overcoat makes to form the second shoe cream room (Q2) between oil cylinder (5) cylinder body and sleeve (7), base (1) is also provided with the interface channel (15) being communicated with oil storage grooves (12) and the second shoe cream room (Q2), the lower end of described sleeve (7) to be fixed in the second fixed groove (14) and to be tightly connected with base (1), the upper end of oil cylinder (5) cylinder body is stretched out sleeve (7) and between oil cylinder (5) cylinder body and sleeve (7), is connected jam nut (9) and makes oil cylinder (5) cylinder body upper end and sleeve (7) fix and be formed to seal.
2. combination hydraulic lifting machine according to claim 1, it is characterized in that, the upper end of described sleeve (7) is the throat structure that end is formed to in-flanges (71), described jam nut (9) outer peripheral face has flange (91) and be provided with packing seal (011) between flange (91) and flange (71), and when jam nut (9) is locked, packing seal (011) is pressed on flange (71) lateral surface by flange (91).
3. combination hydraulic lifting machine according to claim 1 and 2, it is characterized in that, described jam nut (9) inner peripheral surface is stepped hole, be respectively the first hole wall (92) and the second hole wall (93), described oil cylinder (5) cylinder body upper end has the step outer peripheral face matched with jam nut (9), be provided with seal ring between first hole wall (92) and oil cylinder (5) cylinder body, be threaded connection with oil cylinder (5) cylinder body in the flange (71) that the second hole wall (93) extend into sleeve (7).
4. combination hydraulic lifting machine according to claim 3, it is characterized in that, described is provided with filler port on sleeve (7), in described filler port, be plugged with plug cock (012), described plug cock (012) has the air extractor vent of the connection external world and the second shoe cream room Q2 and in air extractor vent, is provided with the cavernous body preventing fluid from spilling.
5. combination hydraulic lifting machine according to claim 4, it is characterized in that, the shape of described the second fixed groove (14) is annular, and the outer peripheral face of described sleeve (7) lower end fixes and arrange delta ring sealing gasket (8) on the outer ring surface of the second fixed groove (14) and between outer peripheral face and outer ring surface.
6. combination hydraulic lifting machine according to claim 5, is characterized in that, described interface channel (15) is L shape, and one end open is arranged on the bottom of the second fixed groove (14), and other end opening is arranged on the bottom of oil storage grooves (12).
7. combination hydraulic lifting machine according to claim 6, is characterized in that, described sleeve (7) outer wall is provided with the hanger (72) of evagination and is connected by welding (73).
8. combination hydraulic lifting machine according to claim 7, is characterized in that, the degree of depth of described oil storage grooves (12) is greater than the height of oil pump (2), and the bottom of oil pump (2) distance oil storage grooves (12) has a segment distance.
9. combination hydraulic lifting machine according to claim 8, it is characterized in that, described oil circuit comprises oil-feed oil circuit, oil return circuit and safety oil-way, and described oil-feed oil circuit comprises check valve (011) and oil duct A, B, C, D, E of being communicated with oil pump (2) and check valve (011) oil inlet of being arranged in base (1) and oil duct F, G, H, K of being communicated with check valve (011) outlet and oil cylinder (5) cylinder body; Described oil return circuit comprises two-position two-way solenoid valve (014), oil return circuit comprises the two-position two-way solenoid valve (014) be arranged on oil duct F, the import P1 of two-position two-way solenoid valve (014) is communicated with oil duct F, the outlet T of two-position two-way solenoid valve (014) is communicated with shoe cream room Q1, described safety oil-way comprises safety valve (016), the import of safety valve (016) is communicated with oil duct H, and the outlet of safety valve (016) is communicated with by oil duct S with between oil storage grooves (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410453117.5A CN104210408A (en) | 2014-09-05 | 2014-09-05 | Combined hydraulic lifting machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410453117.5A CN104210408A (en) | 2014-09-05 | 2014-09-05 | Combined hydraulic lifting machine |
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| CN104210408A true CN104210408A (en) | 2014-12-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410453117.5A Pending CN104210408A (en) | 2014-09-05 | 2014-09-05 | Combined hydraulic lifting machine |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2232433Y (en) * | 1995-06-20 | 1996-08-07 | 时文华 | Double-stage hydraulic lifter |
| CN1709760A (en) * | 2005-06-07 | 2005-12-21 | 金建平 | Electric/manual lifting device for driver's cab turnover |
| CN101100200A (en) * | 2007-08-02 | 2008-01-09 | 王树革 | Entirety type electric and manual hydraulic lifter for overturning driving cab |
| CN202029957U (en) * | 2011-05-09 | 2011-11-09 | 重庆动霸机械制造有限公司 | Tricycle with self-discharging packing case |
| CN202029730U (en) * | 2011-03-28 | 2011-11-09 | 重庆动霸机械制造有限公司 | Hydraulic system for lifting packing box of small-sized motor vehicle |
| CN204020669U (en) * | 2014-09-05 | 2014-12-17 | 刘永祯 | A kind of combination hydraulic lifting machine |
-
2014
- 2014-09-05 CN CN201410453117.5A patent/CN104210408A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2232433Y (en) * | 1995-06-20 | 1996-08-07 | 时文华 | Double-stage hydraulic lifter |
| CN1709760A (en) * | 2005-06-07 | 2005-12-21 | 金建平 | Electric/manual lifting device for driver's cab turnover |
| CN101100200A (en) * | 2007-08-02 | 2008-01-09 | 王树革 | Entirety type electric and manual hydraulic lifter for overturning driving cab |
| CN202029730U (en) * | 2011-03-28 | 2011-11-09 | 重庆动霸机械制造有限公司 | Hydraulic system for lifting packing box of small-sized motor vehicle |
| CN202029957U (en) * | 2011-05-09 | 2011-11-09 | 重庆动霸机械制造有限公司 | Tricycle with self-discharging packing case |
| CN204020669U (en) * | 2014-09-05 | 2014-12-17 | 刘永祯 | A kind of combination hydraulic lifting machine |
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Application publication date: 20141217 |