CN102966622A - Tester and hydraulic power device thereof - Google Patents
Tester and hydraulic power device thereof Download PDFInfo
- Publication number
- CN102966622A CN102966622A CN2012104570787A CN201210457078A CN102966622A CN 102966622 A CN102966622 A CN 102966622A CN 2012104570787 A CN2012104570787 A CN 2012104570787A CN 201210457078 A CN201210457078 A CN 201210457078A CN 102966622 A CN102966622 A CN 102966622A
- Authority
- CN
- China
- Prior art keywords
- hydraulic cylinder
- oil
- power unit
- oil hydraulic
- hydraulic power
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Abstract
The invention discloses a hydraulic power device, which comprises a machine frame, a motor, a lead screw nut pair composed of a turn-screw and a lead screw nut sleeved at the turn-screw, a first hydraulic cylinder whose of which a first cylinder body is fixedly connected to the machine frame; , and a control valve group connected to the first hydraulic cylinder, wherein the lead screw nut pair and the motor are connected to the upper end of the turn-screw; the lead screw nut pair is connected with the a first piston of the first hydraulic cylinder through the lead screw nut; an upper oil suction and an upper oil outlet are arranged on the top part of the first cylinder body of the first hydraulic cylinder; and the bottom of the first cylinder body is provided with a lower oil suction and a lower oil outlet. Compared with the prior art that adopts an oil pump as the power device, the hydraulic power device in disclosed by the invention is higher in working efficiency and smaller in noise. The invention further provides a tester including the hydraulic power device.
Description
Technical field
The present invention relates to the hydraulic power technical field, particularly a kind of testing machine and hydraulic power unit thereof.
Background technique
In static test-machine, the subcategory of clamping fixture is divided according to drive form and usually is divided into two kinds of mechanical type and hydraulic types.Wherein, hydraulic clamp can realize larger chucking power and automatic control etc., therefore uses more in than the large-tonnage testing machine.Different structural type is also arranged in hydraulic fixture, and to the folder anchor clamps, they are used in respectively on the different type of machines, respectively have its own characteristics such as wedge shape hydraulic fixture and horizontal sliding.
As depicted in figs. 1 and 2, Fig. 1 is the working state schematic representation that is applied to the wedge shape hydraulic fixture of testing machine in the prior art; Fig. 2 is applied to the horizontal sliding of testing machine to the working state schematic representation of folder anchor clamps in the prior art.Fig. 1 and Fig. 2 show respectively wedge shape hydraulic fixture and horizontal sliding to the working state of folder anchor clamps; Wedge shape hydraulic fixture 01 comprises on the wedge shape clamping part 012 under the clamping part 011 and wedge shape among Fig. 1; Horizontal sliding also is provided with the clamping part 021 peaceful clamping part 022 that pushes in the horizontal sliding to folder anchor clamps 02 among Fig. 2.
Above-mentioned two kinds of anchor clamps all rely on the anchor clamps oil cylinder that chucking power is provided, and in the situation of the higher chucking power of needs, just need the anchor clamps oil cylinder that higher hydraulic pressure is provided.For folder anchor clamps 02, as shown in Figure 2, because horizontal sliding does not have wedge shape from locking face to folder anchor clamps 02, so the anchor clamps oil cylinder must relatively export enough large power and come the clamping sample, overcomes the pulling force of master cylinder for horizontal sliding.Under limited piston cross-section, very large power to be produced, higher hydraulic pressure must be relied on.
Present testing machine all is to adopt oil pump as hydraulic power unit, produces ultrahigh pressure and be mostly to adopt high pressure oil pump in hydraulic system, and oil pump rotatablely moves to drive by motor and constantly high pressure oil flowed to system.
Although adopt high pressure oil pump can bring higher hydraulic pressure and flow, but adopt this mode consumed energy high, because anchor clamps are very little very little to the demand of flow in process of the test, and system will export by working flow, certainly will cause unnecessary flow overflow, cause energy dissipation.In addition, adopt high pressure oil pump, under the high-voltage high-speed motion, can produce larger noise, usually surpass 75dB, in some cases, the noise of ultrahigh pressure oil sources also may be lower than 75dB, for example be 72dB, the noise of above-mentioned decibel value can produce larger noise pollution to environment.Because continuous motion and the high-voltage operation of motor, system can produce a part of hot merit, normally moves for keeping system, and these conventional oil sources often are furnished with air-cooling device, and this has also increased power consumption and the noise of system.
In view of this, providing testing machine and the hydraulic power unit thereof that a kind of working efficiency is higher, noise is less is the present technical issues that need to address of those skilled in the art.
Summary of the invention
The first purpose of the present invention aims to provide a kind of hydraulic power unit, compares as power plant with the available technology adopting oil pump, and this hydraulic power unit working efficiency is higher, noise is less.The second purpose of the present invention aims to provide a kind of testing machine that comprises above-mentioned hydraulic power unit.
For solving above-mentioned first technical problem, the invention provides a kind of hydraulic power unit, the screw pair that comprises frame, motor, formed by turn-screw and the feed screw nut that is connected described turn-screw, the first oil hydraulic cylinder that its first cylinder body is fixed in described frame, the control valve group that is connected with described the first oil hydraulic cylinder; Described screw pair is connected in the upper end of described turn-screw with described motor, described screw pair is connected by the first piston of described feed screw nut with described the first oil hydraulic cylinder; The top of described first cylinder body of described the first oil hydraulic cylinder is provided with inlet port and upper oil outlet, and the bottom of described the first cylinder body is provided with lower inlet port and lower oil outlet.
Preferably, described control valve group comprises four one-way valves that arrange in the same way, and described upper inlet port, described upper oil outlet, described lower inlet port and the lower oil outlet of being connected are connected with one of described four one-way valves that arrange in the same way respectively.
Preferably, also comprise the guiding connecting plate, the upper end of described guiding connecting plate is connected with described first piston with the lower end of affixed, the described guiding connecting plate of described feed screw nut.
Preferably, also comprise the second oil hydraulic cylinder, the second piston of described the second oil hydraulic cylinder is connected with the lower end of described guiding connecting plate, and the second cylinder body of described the second oil hydraulic cylinder is fixed in described frame.
Preferably, the active area of described the second oil hydraulic cylinder is less than the active area of described the first oil hydraulic cylinder.
Preferably, also comprise the 3rd oil hydraulic cylinder, the 3rd piston of described the 3rd oil hydraulic cylinder is connected with the lower end of described guiding connecting plate, and the 3rd cylinder body of described the 3rd oil hydraulic cylinder is fixed in described frame.
Preferably, the active area of described the 3rd oil hydraulic cylinder is less than the active area of described the first oil hydraulic cylinder.
Preferably, described motor is connected by elastic coupling flexible coupling with described turn-screw.
Preferably, described frame is the four column type framework.
For solving above-mentioned second technical problem, the present invention also provides a kind of testing machine, comprises the power plant of hydraulic fixture and the described hydraulic fixture of driving, and described power plant are each described hydraulic power unit of claim 1 to 9.
Hydraulic power unit provided by the invention utilizes oil hydraulic cylinder to replace operation of oil pump, with rotatablely moving of the straight line motion replacement oil pump of oil hydraulic cylinder.The driven by motor turn-screw is rotated motion during work, and turn-screw will rotatablely move by feed screw nut and change into straight line motion, and the drive first piston carries out straight line motion; When first piston moves downward, the first oil hydraulic cylinder is discharged the hydraulic oil of certain flow and pressure by lower oil outlet, simultaneously, become gradually large upper chamber in the first oil hydraulic cylinder and be oil sucting cavity, this chamber because the effect of atmospheric pressure by upper inlet port inhalant liquid force feed; When first piston moves upward, the first oil hydraulic cylinder is discharged the hydraulic oil of certain flow and pressure by upper oil outlet, simultaneously, become gradually large lower chamber in the first oil hydraulic cylinder and be oil sucting cavity, this chamber because the effect of atmospheric pressure by lower inlet port inhalant liquid force feed; The hydraulic oil of discharging in the first oil hydraulic cylinder enters the control valve group, controls its flow direction and pressure by the control valve group, thereby provides reliable hydraulic power for the action of needs; This process is a work cycle, and the first oil hydraulic cylinder moves repeatedly, constantly repeats above-mentioned do action.
Hydraulic power unit of the present invention, in the repeatedly motion of upper and lower two directions of the first oil hydraulic cylinder, the hydraulic oil of certain flow and pressure all can be provided, providing under the identical hydraulic pressure, hydraulic power unit volumetric efficiency of the present invention is high, and pump oil flow is controlled easily, it does not waste power substantially, so the power of motor of selecting is also little, thus less energy intensive, and noise is lower.
Testing machine provided by the invention owing to have above-described hydraulic power unit, therefore, also has the useful technique effect of above-described hydraulic power unit, does not repeat them here.
Description of drawings
Fig. 1 is the working state schematic representation that is applied to the wedge shape hydraulic fixture of testing machine in the prior art; Fig. 2
Be the horizontal sliding that is applied to testing machine in the prior art working state schematic representation to the folder anchor clamps;
Fig. 3 is an angle perspective view of a kind of embodiment of hydraulic power unit provided by the present invention;
Fig. 4 is the perspective view of another angle of hydraulic power unit shown in Figure 3;
Fig. 5 is the perspective view of the another angle of hydraulic power unit shown in Figure 3;
Fig. 6 is the generalized section of hydraulic power unit shown in Figure 1;
Fig. 7 is the working state schematic representation when the first oil hydraulic cylinder moves downward in a kind of embodiment of hydraulic power unit provided by the present invention;
Working state schematic representation when the first oil hydraulic cylinder moves upward in the embodiment shown in Fig. 8 figure;
Fig. 9 is the structural representation of a kind of embodiment of testing machine provided by the invention.
Embodiment
The first core of the present invention is compared as power plant with the available technology adopting oil pump for a kind of hydraulic power unit is provided, and this hydraulic power unit working efficiency is higher, noise is less.The second core of the present invention is for providing a kind of testing machine that comprises above-mentioned hydraulic power unit.
In order to make those skilled in the art understand better technological scheme of the present invention, the present invention is described in further detail below in conjunction with the drawings and specific embodiments.
Please refer to Fig. 3 to Fig. 8, Fig. 3 is an angle perspective view of a kind of embodiment of hydraulic power unit provided by the present invention; Fig. 4 is the perspective view of another angle of hydraulic power unit shown in Figure 3; Fig. 5 is the perspective view of the another angle of hydraulic power unit shown in Figure 3; Fig. 6 is the generalized section of hydraulic power unit shown in Figure 1, Fig. 7 is the working state schematic representation when the first oil hydraulic cylinder moves downward in a kind of embodiment of hydraulic power unit provided by the present invention, the working state schematic representation when the first oil hydraulic cylinder moves upward in the embodiment shown in Fig. 8 figure.
Such as Fig. 3, Fig. 4, Fig. 5 and shown in Figure 6, hydraulic power unit provided by the invention, the screw pair 3 that comprises frame 1, motor 2, formed by turn-screw 31 and the feed screw nut 32 that is connected turn-screw 31, the first oil hydraulic cylinder 4 that its first cylinder body 41 is fixed in frame 1, the control valve group 5 that is connected with the first oil hydraulic cylinder 4; Screw pair 3 is connected with the first piston 42 of the first oil hydraulic cylinder 4 by feed screw nut 32 with upper end, screw pair 3 that motor 2 is connected in turn-screw 31; The bottom that the top of the first cylinder body 41 of the first oil hydraulic cylinder 4 is provided with inlet port 411 and upper oil outlet 413, the first cylinder bodies 41 is provided with lower inlet port 412 and lower oil outlet 414.
Further with reference to figure 7 and Fig. 8, hydraulic power unit provided by the invention, during work, at first set the size of output flow by the rotating speed of setting motor 2, then starting electrical machinery 2 drives turn-screw 31 and is rotated motion, turn-screw 31 will rotatablely move by feed screw nut 32 and change into straight line motion, and drive first piston 42 carries out straight line motion; When first piston 42 moves downward, the first oil hydraulic cylinder 4 is discharged the hydraulic oil of certain flow and pressure by lower oil outlet 414, simultaneously, become gradually large upper chamber in the first oil hydraulic cylinder 4 and be oil sucting cavity, this chamber because the effect of atmospheric pressure by upper inlet port 411 inhalant liquid force feeds; When first piston 42 moves upward, the first oil hydraulic cylinder 4 is discharged the hydraulic oil of certain flow and pressure by upper oil outlet 413, simultaneously, become gradually large lower chamber in the first oil hydraulic cylinder 4 and be oil sucting cavity, this chamber because the effect of atmospheric pressure by lower inlet port 412 inhalant liquid force feeds; Enter control valve group 5 from the hydraulic oil of the first oil hydraulic cylinder 4 interior discharges, by control valve group 5 its flow direction of control and pressure, also can change by the rotating speed of adjusting motor 2 size of output flow, thereby provide reliable hydraulic power for the action of needs; This process is a work cycle, and the first oil hydraulic cylinder 4 moves repeatedly, constantly repeats above-mentioned do action.
Hydraulic power unit of the present invention, in the repeatedly motion of upper and lower two directions of the first oil hydraulic cylinder 4, the hydraulic oil of certain flow and pressure all can be provided, providing under the identical hydraulic pressure, hydraulic power unit volumetric efficiency of the present invention is high, and pump oil flow is controlled easily, it does not waste power substantially, so the power of motor of selecting is also little, thus less energy intensive, and noise is lower.The present invention is particularly suitable for the situation of testing machine hydraulic fixture working state, and the similar working state of other type lathes.
In a kind of embodiment, providing under the identical hydraulic pressure condition, in the prior art, adopt oil pump as power plant, its power demand is 2.2kW, the respective design power of hydraulic power unit of the present invention is 0.75kW.
The available technology adopting oil pump is about 75dB as the normal operation noise of power plant, and the about 60dB of normal operation noise of hydraulic power unit of the present invention.
In a kind of embodiment, the control valve group comprises four one-way valves 51 that arrange in the same way, and upper inlet port 411, upper oil outlet 413, lower inlet port 412 and lower oil outlet 414 are connected with one of four one-way valves 51 that arrange in the same way respectively.Upper inlet port 411 and lower inlet port 412 be connected in oil storage fuel tank 10, the first oil hydraulic cylinders 4 by upper inlet port 411, lower inlet port 412 from 10 oil suctions of oil storage fuel tank, the system liquid force feed through the circulation after oil return also flow into oil storage fuel tank 10.Can be provided with 52 pairs of fuel-displaced flows of solenoid valve in the control valve group regulates.
In a kind of embodiment, hydraulic power unit of the present invention is provided with guiding connecting plate 6, and the upper end of guiding connecting plate 6 is affixed with the feed screw nut, the lower end of guiding connecting plate 6 is connected with first piston 42.By the guiding connecting plate is set, can expand and connect a plurality of oil hydraulic cylinders, can realize that a plurality of oil hydraulic cylinder parallel connections control respectively, can realize a plurality of oil hydraulic cylinder co-operation or work respectively.The structural type of guiding connecting plate 6 can be dependent on Cylinder for Parallel Connection what and carry out different settings.In two following embodiments, realized respectively the parallel connection of two and three oil hydraulic cylinders by guiding connecting plate 6.
In a kind of embodiment, hydraulic power unit of the present invention also is provided with the structure setting of the second oil hydraulic cylinder 7, the second oil hydraulic cylinders 7 can be identical or approximate with the first oil hydraulic cylinder 4, and the working state of the second oil hydraulic cylinder 7 can be referring to Fig. 7 and Fig. 8.The second piston of the second oil hydraulic cylinder 7 is connected with the lower end of guiding connecting plate 6, and the second cylinder body of the second oil hydraulic cylinder 7 is fixed in frame 1.In this kind embodiment, hydraulic power unit provided by the invention, the to-and-fro motion of the first oil hydraulic cylinder 4 and the second oil hydraulic cylinder 7 all can provide hydraulic power, and whether it needs output to be controlled by the control valve group according to the operating mode needs.
In one embodiment, the second oil hydraulic cylinder 7 is small cylinders in parallel with the first oil hydraulic cylinder 4, under identical input power because this oil hydraulic cylinder active area is little, so it will export higher pressure, be the high pressure liquid cylinder pressure, the high pressure liquid cylinder pressure can bear higher pressure.
In another kind of embodiment, hydraulic power unit of the present invention also is provided with the structure setting of the 3rd oil hydraulic cylinder 8, the three oil hydraulic cylinders 8 can be identical or approximate with the first oil hydraulic cylinder 4, and the working state of the 3rd oil hydraulic cylinder 8 can be referring to Fig. 7 and Fig. 8.The 3rd piston of the 3rd oil hydraulic cylinder 8 is connected with the lower end of guiding connecting plate 6, and the 3rd cylinder body of the 3rd oil hydraulic cylinder 8 is fixed in frame 1.The 3rd oil hydraulic cylinder 8 is in this kind embodiment, hydraulic power unit provided by the invention, the to-and-fro motion of the first oil hydraulic cylinder 4, the second oil hydraulic cylinder 7 and the 3rd oil hydraulic cylinder 8 all can provide hydraulic power, and whether it needs output to be controlled by the control valve group according to the operating mode needs.
In one embodiment, the second oil hydraulic cylinder 7 and the 3rd oil hydraulic cylinder 8 are the small cylinders that are connected in parallel on the first oil hydraulic cylinder 4 both sides, under identical input power because the second oil hydraulic cylinder 7 and the 3rd oil hydraulic cylinder 8 active areas are little, so they will export higher pressure, be the high pressure liquid cylinder pressure, the high pressure liquid cylinder pressure can bear higher pressure.In one embodiment, the active area of the second oil hydraulic cylinder 7 is with identical with the active area of three oil hydraulic cylinders.Hydraulic power unit provided by the invention can also adopt more oil hydraulic cylinder parallel operation according to need of work, thereby the realization instantaneous large flow of low pressure and ultrahigh pressure guarantor are carried.
In a kind of embodiment, motor 2 is connected by elastic coupling flexible coupling 9 with turn-screw 31, and elastic coupling flexible coupling 9 can play buffer function, further reduces noise.
In a kind of embodiment, motor 2 is actuating motor.By selecting the output flow that actuating motor can the stepless change hydraulic power unit.Other dissimilar motors can certainly be selected, by selecting dissimilar motors, output flow and whole output parameter can be conveniently controlled.
In a kind of embodiment, such as Fig. 3, Fig. 4 and shown in Figure 5, frame 1 is the four column type framework.This four column type framework has two effects, and the one, for whole components and parts provide the mounting arrangements space, the 2nd, the reaction force that can provide hydraulic pressure to export.
Further with reference to figure 9, Fig. 9 is the structural representation of a kind of embodiment of testing machine provided by the invention.
The present invention also provides testing machine, comprises the power plant (not shown) of hydraulic fixture 02 ' and this hydraulic fixture 02 ' of driving.In a kind of preferred embodiment, hydraulic fixture 02 ' is that horizontal sliding is to the folder anchor clamps, this horizontal sliding also is provided with clamping part 021 ' the peaceful clamping part 022 ' that pushes in the horizontal sliding to the folder anchor clamps, and testing machine provided by the invention can show higher working efficiency in the situation that adopts horizontal sliding to the folder anchor clamps.Among the present invention, the power plant that drive hydraulic fixture 02 ' are above-described any hydraulic power unit.Testing machine provided by the invention is used the above hydraulic power unit and is finished test or auxiliary finish test.
Testing machine provided by the invention owing to have above-described hydraulic power unit, therefore, also has the useful technique effect of above-described hydraulic power unit, does not repeat them here.
Used specific case herein principle of the present invention and mode of execution are set forth, above embodiment's explanation just is used for helping to understand method of the present invention and core concept thereof.Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention, can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of claim of the present invention.
Claims (10)
1. hydraulic power unit, it is characterized in that the screw pair (3) that comprises frame (1), motor (2), formed by turn-screw (31) and the feed screw nut that is connected described turn-screw (31) (32), the first oil hydraulic cylinder (4) that its first cylinder body (41) is fixed in described frame (1), the control valve group (5) that is connected with described the first oil hydraulic cylinder (4);
Described screw pair (3) is connected in the upper end of described turn-screw (31) with described motor (2), described screw pair (3) is connected with the first piston (42) of described the first oil hydraulic cylinder (4) by described feed screw nut (32);
The top of described first cylinder body (41) of described the first oil hydraulic cylinder (4) is provided with inlet port (411) and upper oil outlet (413), and the bottom of described the first cylinder body (41) is provided with lower inlet port (412) and lower oil outlet (414).
2. hydraulic power unit according to claim 1, it is characterized in that, described control valve group (5) comprises four one-way valves (51) that arrange in the same way, and described upper inlet port (411), described upper oil outlet (413), described lower inlet port (412) and the lower oil outlet (414) of being connected are connected with one of described four one-way valves (51) that arrange in the same way respectively.
3. hydraulic power unit according to claim 1, it is characterized in that, also comprise guiding connecting plate (6), the upper end of described guiding connecting plate (6) is connected with described first piston (42) with the lower end of affixed, the described guiding connecting plate of described feed screw nut (32) (6).
4. hydraulic power unit according to claim 3, it is characterized in that, also comprise the second oil hydraulic cylinder (7), the second piston of described the second oil hydraulic cylinder (7) is connected with the lower end of described guiding connecting plate (6), and the second cylinder body of described the second oil hydraulic cylinder (7) is fixed in described frame (1).
5. hydraulic power unit according to claim 4 is characterized in that, the active area of described the second oil hydraulic cylinder (7) is less than the active area of described the first oil hydraulic cylinder (4).
6. according to claim 4 or 5 described hydraulic power units, it is characterized in that, also comprise the 3rd oil hydraulic cylinder (8), the 3rd piston of described the 3rd oil hydraulic cylinder (8) is connected with the lower end of described guiding connecting plate (6), and the 3rd cylinder body of described the 3rd oil hydraulic cylinder (8) is fixed in described frame (1).
7. hydraulic power unit according to claim 6 is characterized in that, the active area of described the 3rd oil hydraulic cylinder (8) is less than the active area of described the first oil hydraulic cylinder (4).
8. hydraulic power unit according to claim 1 is characterized in that, described motor (2) is connected by elastic coupling flexible coupling (9) with described turn-screw (31).
9. hydraulic power unit according to claim 1 is characterized in that, described frame (1) is the four column type framework.
10. testing machine comprises hydraulic fixture (02 ') and drives the power plant of described hydraulic fixture (02 '), it is characterized in that described power plant are each described hydraulic power unit of claim 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104570787A CN102966622A (en) | 2012-11-14 | 2012-11-14 | Tester and hydraulic power device thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104570787A CN102966622A (en) | 2012-11-14 | 2012-11-14 | Tester and hydraulic power device thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102966622A true CN102966622A (en) | 2013-03-13 |
Family
ID=47796977
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012104570787A Pending CN102966622A (en) | 2012-11-14 | 2012-11-14 | Tester and hydraulic power device thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102966622A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000346008A (en) * | 1999-06-04 | 2000-12-12 | Kumamoto Technopolis Foundation | Hydraulic-pneumatic pressure hybrid actuator and two- degree freedpom hydraulic-pneumatic pressure hybrid actuator in combination thereof |
| KR20070009022A (en) * | 2005-07-15 | 2007-01-18 | 강기철 | Oilpressure power motor |
| CN101571150A (en) * | 2009-05-27 | 2009-11-04 | 张明芳 | Booster cylinder and booster pump adopting booster cylinder |
| CN201568393U (en) * | 2009-04-25 | 2010-09-01 | 孙家茂 | Hydraulic system without pump |
| CN101943647A (en) * | 2010-09-02 | 2011-01-12 | 西安美泰电气科技有限公司 | Pneumatic hydraulic pressure fixture |
| CN202418098U (en) * | 2011-12-04 | 2012-09-05 | 江苏华商企业管理咨询服务有限公司 | Speed and pressure control system of hydraulic cylinder |
| CN102721609A (en) * | 2012-07-03 | 2012-10-10 | 济南科汇试验设备有限公司 | Universal test machine |
| CN202914430U (en) * | 2012-11-14 | 2013-05-01 | 美特斯工业系统（中国）有限公司 | Testing machine and hydraulic power unit thereof |
-
2012
- 2012-11-14 CN CN2012104570787A patent/CN102966622A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000346008A (en) * | 1999-06-04 | 2000-12-12 | Kumamoto Technopolis Foundation | Hydraulic-pneumatic pressure hybrid actuator and two- degree freedpom hydraulic-pneumatic pressure hybrid actuator in combination thereof |
| KR20070009022A (en) * | 2005-07-15 | 2007-01-18 | 강기철 | Oilpressure power motor |
| CN201568393U (en) * | 2009-04-25 | 2010-09-01 | 孙家茂 | Hydraulic system without pump |
| CN101571150A (en) * | 2009-05-27 | 2009-11-04 | 张明芳 | Booster cylinder and booster pump adopting booster cylinder |
| CN101943647A (en) * | 2010-09-02 | 2011-01-12 | 西安美泰电气科技有限公司 | Pneumatic hydraulic pressure fixture |
| CN202418098U (en) * | 2011-12-04 | 2012-09-05 | 江苏华商企业管理咨询服务有限公司 | Speed and pressure control system of hydraulic cylinder |
| CN102721609A (en) * | 2012-07-03 | 2012-10-10 | 济南科汇试验设备有限公司 | Universal test machine |
| CN202914430U (en) * | 2012-11-14 | 2013-05-01 | 美特斯工业系统（中国）有限公司 | Testing machine and hydraulic power unit thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR20130125757A (en) | Hybrid hydraulic systems for industrial processes | |
| US9623463B2 (en) | Hydraulic press brake | |
| CN1815040A (en) | Concrete pump hydraulic system auxiliary energy-storage flow-increasing device (2) | |
| CN204849060U (en) | Full -automatic urgent device of generating line lift frame and generating line hoisting device | |
| CN202914430U (en) | Testing machine and hydraulic power unit thereof | |
| CN102528543A (en) | Hydraulic balancing loop and hydraulic balancing device | |
| CN107571139B (en) | Dual-workpiece alternating abrasive flow polishing machine | |
| CN102155453A (en) | Switching valve and double-motive power closed hydraulic system with switching valve | |
| CN103831493A (en) | Special electrolysis machine structure for burring plunger collar oil grooves | |
| CN102966622A (en) | Tester and hydraulic power device thereof | |
| CN202645426U (en) | Push-and-pull hydraulic system for horizontal directional drilling machine | |
| CN102168696A (en) | High-low pressure switching control system, concrete pumping system and device | |
| CN105855958B (en) | Universal pneumatic self-locking clamping device | |
| CN202021357U (en) | Special numerical control floor type boring machine with seven shafts in linkage | |
| CN107839750A (en) | A kind of servo steering system and automobile | |
| CN202241218U (en) | Reciprocating motion working table | |
| CN203906417U (en) | Air-driven and liquid-operated power system on corner combining machine | |
| CN107013509B (en) | A kind of iron driller hydraulic clamping system | |
| CN106735394B (en) | A kind of dual sided porous drilling hydraulic system of modular machine tool | |
| CN202031822U (en) | Integral-type concrete pump high-low-pressure switching device | |
| CN201906997U (en) | Hydraulic clamping device for NC rotary table | |
| CN103506879A (en) | Pneumatic part clamping device used for machining center | |
| CN210756584U (en) | Locomotive frame end shock absorber seat adds clamping apparatus | |
| CN110253323B (en) | Hydraulic tool changing system of machining center and tool changing method thereof | |
| CN201913822U (en) | Control device for clamping and jacking movable working platform |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C05 | Deemed withdrawal (patent law before 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20130313 |