CN110005658A - The detection device and detection method of piston turning moment - Google Patents
The detection device and detection method of piston turning moment Download PDFInfo
- Publication number
- CN110005658A CN110005658A CN201910156436.2A CN201910156436A CN110005658A CN 110005658 A CN110005658 A CN 110005658A CN 201910156436 A CN201910156436 A CN 201910156436A CN 110005658 A CN110005658 A CN 110005658A
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- China
- Prior art keywords
- baffle
- piston rod
- pressure detecting
- detecting assembly
- rod
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
- F15B19/005—Fault detection or monitoring
Abstract
The invention discloses the detection devices and detection method of a kind of piston turning moment, belong to instrument detection field.The detection device includes guide rod, guide support seat and pressure detecting assembly；The both ends of guide rod are separately fixed on two oil cylinders, and guide rod is arranged in parallel with piston rod；Guide support seat is located between two oil cylinders, and one end of guide support seat is fixed on the piston rod, the other end of guide support seat is equipped with the first baffle and second baffle of parallel interval setting, and opening is formed between first baffle and second baffle, and guide rod passes through opening；Pressure detecting assembly is separately positioned in the opposite one side of first baffle and second baffle, for detecting the pressure between guide rod and first baffle or second baffle.Using detection device provided by the invention, the turning moment of piston rod can be accurately determined according to the distance of the axis at the midpoint of the measured value of pressure detecting assembly and pressure detecting assembly to piston rod.
Description
Technical field
The present invention relates to instrument detection field, in particular to a kind of the detection device and detection method of piston turning moment.
Background technique
The executing agency of Large Hydraulic System generally includes piston rod and oil cylinder, and the both ends of piston rod are separately positioned on two
In oil cylinder, reciprocal fortune is done in two oil cylinders by the i.e. controllable piston rod of the flow for the hydraulic oil being passed through in two oil cylinders of control
It is dynamic.Oil cylinder inner wall is additionally provided with bushing, and bushing is set in outside piston rod, play the role of sealing, it is antiwear.
Since the outer wall of piston rod and the inner wall of bushing are always there is the helical form trace formed is machined, when work
When stopper rod moves reciprocatingly in oil cylinder, turning moment can be generated.Piston rod rotation in order to prevent leads to mechanical breakdown, it will usually
Limit assembly for preventing piston rod from rotating is set in executing agency.
In the implementation of the present invention, the inventor finds that the existing technology has at least the following problems:
When limit assembly is arranged, the turning moment according to piston rod is needed, selects the limit assembly of respective intensities.But
The turning moment of piston is without method quantitative measurement at present, and therefore, the Strength co-mputation that will lead to limit assembly can not calculate, thus can not
Suitable limit assembly is chosen to limit the rotation of piston rod.
Summary of the invention
The embodiment of the invention provides the detection devices and detection method of a kind of piston turning moment, can accurately measure work
The turning moment of plug.The technical solution is as follows:
In a first aspect, provide a kind of detection device of piston turning moment, in the executing agency of hydraulic system, institute
Stating executing agency includes piston rod and oil cylinder, and the both ends of the piston rod are separately positioned in two oil cylinders, the detection
Device includes guide rod, guide support seat and pressure detecting assembly；
The both ends of the guide rod are separately fixed on two oil cylinders, and the guide rod is parallel with the piston rod
Setting；
The guide support seat is located between two oil cylinders, and one end of the guide support seat is fixed on the work
On stopper rod, the other end of the guide support seat is equipped with the first baffle and second baffle of parallel interval setting, the first gear
Opening is formed between plate and the second baffle, the guide rod passes through the opening；
The pressure detecting assembly is separately positioned in the opposite one side of the first baffle and the second baffle, is used
Pressure between the detection guide rod and the first baffle or the second baffle.
Further, the middle part of the piston rod is equipped at least one threaded hole, the guide support seat and the piston
It is bolted to connection between bar.
Further, the one side opposite with the second baffle of the first baffle is equipped with for accommodating the pressure
The one side opposite with the first baffle of first groove of detection components, the second baffle is equipped with for accommodating the pressure
Second groove of power detection components, the pressure detecting assembly are fixed on the first baffle and the second gear by fastener
On plate.
Further, the pressure detecting assembly is plane stress bellows sensor.
Further, the detection device further includes connector and display component, the display component by connector with
The pressure detecting assembly connection, the pressure value that the display component is used to detect the pressure detecting assembly digitizes aobvious
Show.
Second aspect provides a kind of detection method of piston turning moment, is filled using detection as described in relation to the first aspect
It sets, the detection method includes:
The executing agency of hydraulic system to be detected is provided, the executing agency includes piston rod and oil cylinder, the piston
The both ends of bar are separately positioned in two oil cylinders；
The detection device is installed in the executing agency；
When the piston rod moves reciprocatingly in two oil cylinders, the measurement of the pressure detecting assembly is recorded
Value；
According to the midpoint of the measured value of the pressure detecting assembly and the pressure detecting assembly to the axis of the piston rod
The distance of line determines the turning moment of the piston rod.
It is further, described that the detection device is installed in the executing agency, comprising:
The both ends of the guide rod are separately fixed on two oil cylinders, keep the guide rod and the piston rod flat
Row setting；
The pressure detecting assembly is respectively installed on the first baffle and second baffle of the guide support seat；
One end of guide support seat is assembled on the piston rod；
The distance between the guide rod and the first baffle and second baffle are adjusted, until the guide rod is to described
The distance of first baffle and the second baffle is setting value；
The guide support seat is fixed with the piston rod.
Further, the distance between the guide rod and the first baffle and second baffle are adjusted, until described lead
It is setting value to bar to the distance of the first baffle and the second baffle, comprising:
Adjust the guide rod being equidistant to the first baffle and second baffle, and the guide rod is to described
The distance of one baffle and the second baffle is no more than 0.15mm.
Further, the detection method further include:
Measure the distance between the guide rod and the first baffle and second baffle respectively using clearance gauge.
Further, described according to the measured value of the pressure detecting assembly and midpoint to the institute of the pressure detecting assembly
The distance for stating the axis of piston rod determines the turning moment of the piston rod, comprising:
Obtain the maximum value in the measured value of the pressure detecting assembly；
The midpoint of maximum value in the measured value of the pressure detecting assembly and the pressure detecting assembly is calculated to described
The product of the distance of the axis of piston rod；
The product is determined as to the turning moment of the piston rod.
Technical solution provided in an embodiment of the present invention has the benefit that
By the way that detection device is arranged, which includes guide rod, guide support seat and pressure detecting assembly, wherein
One end of guide support seat is fixed on the piston rod, and when piston rod rotation, guide support seat can also follow piston rod to turn together
It is dynamic.The other end of guide support seat is equipped with the first baffle and second baffle of parallel interval setting, first baffle and second baffle
Between be formed with opening, guide rod passes through the opening, then when guide support seat rotates, first baffle and second baffle also can be with
Rotation, and guide rod is fixed on oil cylinder, therefore first baffle or second baffle can be contacted with guide rod, generate pressure, this
When the pressure detecting assembly that is arranged on first baffle and second baffle can be detected guide rod and first baffle or second gear
Pressure size between plate, finally according to the midpoint of the measured value of pressure detecting assembly and pressure detecting assembly to piston rod
The distance of axis is that can determine that the turning moment of piston rod, so that it is determined that the intensity size of limit assembly.The detection device knot
Structure is simple, at low cost, is easily installed, uses.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is a kind of structural schematic diagram of the executing agency of hydraulic device provided in an embodiment of the present invention；
Fig. 2 is a kind of part-structure sectional view of executing agency provided in an embodiment of the present invention；
Fig. 3 is a kind of structural schematic diagram of the detection device of piston turning moment provided in an embodiment of the present invention；
Fig. 4 is the structural schematic diagram of the detection device of another piston turning moment provided in an embodiment of the present invention；
Fig. 5 is a kind of structural schematic diagram of piston rod provided in an embodiment of the present invention
Fig. 6 and Fig. 7 is a kind of structural schematic diagram of guide support seat provided in an embodiment of the present invention；
Fig. 8 is the structural schematic diagram of another guide support seat provided in an embodiment of the present invention；
Fig. 9 is a kind of method flow diagram of the detection method of piston turning moment provided in an embodiment of the present invention.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to embodiment party of the present invention
Formula is described in further detail.
In order to better understand the present invention, the structure of the executing agency of hydraulic device is briefly described below:
Fig. 1 is a kind of structural schematic diagram of the executing agency of hydraulic device provided in an embodiment of the present invention, as shown in Figure 1,
The executing agency 100 includes piston rod 110 and oil cylinder 120, and the both ends of piston rod 110 are separately positioned in two oil cylinders 120.
Fig. 2 is a kind of part-structure sectional view of executing agency provided in an embodiment of the present invention, as shown in Fig. 2, oil cylinder 120
Inner wall be additionally provided with bushing 121, bushing 121 is set in outside piston rod 110, play the role of sealing, it is antiwear.
The embodiment of the invention provides a kind of detection devices of piston turning moment, suitable for holding for above-mentioned hydraulic system
Row mechanism.Fig. 3 is a kind of structural schematic diagram of the detection device of piston turning moment provided in an embodiment of the present invention, and Fig. 4 is this
The structural schematic diagram of the detection device for another piston turning moment that inventive embodiments provide, as shown in Figure 3 and Figure 4, the inspection
Surveying device 200 includes guide rod 210, guide support seat 220 and pressure detecting assembly 230.
The both ends of guide rod 210 are separately fixed on two oil cylinders 120, and guide rod 210 is parallel with piston rod 110 sets
It sets.
Figure guide support seat 220 is located between two oil cylinders 120, and one end of guide support seat 220 is fixed on piston rod
On 110, the other end of guide support seat 220 is equipped with the first baffle 221 and second baffle 222 of parallel interval setting, first gear
Opening A is formed between plate 221 and second baffle 222, guide rod 210 passes through opening A.
Pressure detecting assembly 230 is separately positioned in the opposite one side of first baffle 221 and second baffle 222, is used for
Detect the pressure between guide rod 210 and first baffle 221 or second baffle 222.
For the embodiment of the present invention by setting detection device, which includes guide rod, guide support seat and pressure inspection
Survey component, wherein one end of guide support seat is fixed on the piston rod, and when piston rod rotation, guide support seat can also be followed
Piston rod rotates together.The other end of guide support seat is equipped with the first baffle and second baffle of parallel interval setting, first gear
It is formed with opening between plate and second baffle, guide rod passes through the opening, then when guide support seat rotates, first baffle and the
Two baffles also can be with rotation, and guide rod is fixed on oil cylinder, therefore first baffle or second baffle can be contacted with guide rod,
Pressure is generated, the pressure detecting assembly being arranged on first baffle and second baffle at this time can be detected guide rod and first gear
Pressure size between plate or second baffle, finally according to the midpoint of the measured value of pressure detecting assembly and pressure detecting assembly
Distance to the axis of piston rod is that can determine that the turning moment of piston rod, so that it is determined that the intensity size of limit assembly.It should
Structure of the detecting device is simple, at low cost, is easily installed, uses.
Fig. 5 is a kind of structural schematic diagram of piston rod provided in an embodiment of the present invention, as shown in figure 5, in piston rod 110
Portion is equipped at least one threaded hole 110a, can be fixedly connected by bolt 211 between guide support seat 220 and piston rod 110
(referring to fig. 4).It is threadedly coupled easy to disassemble, is conducive to subsequent adjustment guide rod 210 and first baffle 221 and second baffle 222
The distance between.
Optionally, the middle part of piston rod 110 is equipped with multiple groups threaded hole, axially spaced-apart of the multiple groups threaded hole along piston rod 110
Arrangement.Every group of threaded hole includes multiple threaded holes, circumferentially-spaced arrangement of multiple threaded holes along piston rod 110.It is more by being arranged
A threaded hole, can be in order to adjusting fixation position of the guide support seat 220 on piston rod 110.
In the present embodiment, the cross section at the both ends of piston rod 110 being set in oil cylinder 120 is cylinder, piston rod 110
Middle part cross section be non-full-circle spray pattern.
Illustratively, the one side S1 for installing guide support seat 220 at 110 middle part of piston rod is plane, at least one
Threaded hole 110a is arranged on plane S1, in order to install guide support seat 220.The middle part of piston rod 110 is additionally provided with two
Idler wheel (not shown) can be arranged on plane S2 and plane S3, play by the plane S2 and S3 (referring to fig. 4) being oppositely arranged
Guiding role.
Fig. 6 and Fig. 7 is a kind of structural schematic diagram of guide support seat provided in an embodiment of the present invention, as shown in fig. 6, guiding
One end of support base 220 is equipped with bulge-structure 223, and bulge-structure 223 is equipped with the threaded hole 223a for installing bolt.
Fig. 8 is the structural schematic diagram of another guide support seat provided in an embodiment of the present invention, as shown in figure 8, first gear
The one side opposite with second baffle 222 of plate 221 is equipped with the first groove 221a for accommodating pressure detecting assembly 230, the
The one side opposite with first baffle 221 of two baffles 222 is equipped with the second groove for accommodating pressure detecting assembly 230
222a, pressure detecting assembly 230 are fixed on first baffle 221 and second baffle 222 by fastener.By pressure detecting assembly
230 are arranged in groove, can lead to avoid the frictional force generated between guide rod 210 and first baffle 221 and second baffle 222
It causes pressure detecting assembly 230 to tumble along 210 direction of guide rod, damages pressure detecting assembly 230.
Illustratively, multiple threaded holes are equipped on first baffle 221 and second baffle 222, pressure detecting assembly 230 is logical
Bolt is crossed to be fixed on first baffle 221 and second baffle 222.
Optionally, pressure detecting assembly 230 is plane stress bellows sensor.Plane stress bellows sensor is that one kind is adopted
With flat diaphragm pressure-sensitive, the sensor of shell and diaphragm integral structure, plane stress bellows sensor have high-precision, anti-bias load,
The advantages that small in size, stable and reliable for performance.
Further, detection device further includes connector 240 and display component 250, and display component 250 passes through connector
240 connect with pressure detecting assembly 230, and the pressure value that display component 250 is used to detect pressure detecting assembly 230 digitizes
It has been shown that, in order to which testing staff intuitively checks.
Illustratively, connector 240 can be electric wire.
Fig. 9 is a kind of method flow diagram of the detection method of piston turning moment provided in an embodiment of the present invention, such as Fig. 9 institute
Show, which uses above-mentioned detection device, which includes:
Step 901 provides the executing agency of hydraulic system to be detected.
Specifically, referring to Fig. 1, executing agency 100 may include piston rod 110 and oil cylinder 120, the both ends of piston rod 110
It is separately positioned in two oil cylinders 120.
Step 902 will test device and be installed in executing agency.
Illustratively, referring to fig. 4, step 902 may include:
Step a, the both ends of guide rod are separately fixed on two oil cylinders, guide rod is arranged in parallel with piston rod；
Step b, pressure detecting assembly is respectively installed on the first baffle and second baffle of guide support seat；
Step c, one end of guide support seat is assembled on piston rod；
Step d, adjustment guide rod and the distance between first baffle and second baffle, until guide rod to first baffle and
The distance of second baffle is setting value；
Illustratively, step d may include:
Adjustment guide rod is equidistant to first baffle and second baffle, and guide rod is to first baffle and second baffle
Distance be no more than 0.15mm, to prevent guide rod excessive to the distance of first baffle and second baffle, and piston rod rotate
Torque is too small, and pressure detecting assembly can not accurately detect the turning moment of piston rod.
It is alternatively possible to guide rod and the distance between first baffle and second baffle be measured respectively using clearance gauge, to adjust
Whole guide rod and the distance between first baffle and second baffle.
Step e, guide support seat is fixed with piston rod.
Step 903, when piston rod moves reciprocatingly in two oil cylinders, record the measured value of pressure detecting assembly.
Step 904, according to the axis at the midpoint of the measured value of pressure detecting assembly and pressure detecting assembly to piston rod
Distance determines the turning moment of piston rod.
Illustratively, step 904 may include:
Obtain the maximum value F in the measured value of pressure detecting assemblymax；It calculates in the measured value of pressure detecting assembly most
Big value FmaxWith the product of the axis distance L at the midpoint of pressure detecting assembly to piston rod；Product is determined as to the rotation of piston rod
Torque M.That is M=Fmax*L。
For the embodiment of the present invention by setting detection device, which includes guide rod, guide support seat and pressure inspection
Survey component, wherein one end of guide support seat is fixed on the piston rod, and when piston rod rotation, guide support seat can also be followed
Piston rod rotates together.The other end of guide support seat is equipped with the first baffle and second baffle of parallel interval setting, first gear
It is formed with opening between plate and second baffle, guide rod passes through the opening, then when guide support seat rotates, first baffle and the
Two baffles also can be with rotation, and guide rod is fixed on oil cylinder, therefore first baffle or second baffle can be contacted with guide rod,
Pressure is generated, the pressure detecting assembly being arranged on first baffle and second baffle at this time can be detected guide rod and first gear
Pressure size between plate or second baffle, finally according to the midpoint of the measured value of pressure detecting assembly and pressure detecting assembly
Distance to the axis of piston rod is that can determine that the turning moment of piston rod, so that it is determined that the intensity size of limit assembly.It should
Structure of the detecting device is simple, at low cost, is easily installed, uses.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of detection device of piston turning moment, in the executing agency of hydraulic system, the executing agency to include living
Stopper rod and oil cylinder, the both ends of the piston rod are separately positioned in two oil cylinders, which is characterized in that the detection device packet
Include guide rod, guide support seat and pressure detecting assembly；
The both ends of the guide rod are separately fixed on two oil cylinders, and the guide rod is parallel with the piston rod sets
It sets；
The guide support seat is located between two oil cylinders, and one end of the guide support seat is fixed on the piston rod
On, the other end of the guide support seat is equipped with the first baffle and second baffle of parallel interval setting, the first baffle and
Opening is formed between the second baffle, the guide rod passes through the opening；
The pressure detecting assembly is separately positioned in the opposite one side of the first baffle and the second baffle, for examining
Survey the pressure between the guide rod and the first baffle or the second baffle.
2. detection device according to claim 1, which is characterized in that the middle part of the piston rod is equipped at least one screw thread
Hole is bolted to connection between the guide support seat and the piston rod.
3. detection device according to claim 1, which is characterized in that the first baffle it is opposite with the second baffle
One side be equipped with the first groove for accommodating the pressure detecting assembly, the second baffle with the first baffle phase
Pair one side be equipped with the second groove for accommodating the pressure detecting assembly, the pressure detecting assembly is solid by fastener
It is scheduled on the first baffle and the second baffle.
4. detection device according to claim 1, which is characterized in that the pressure detecting assembly is plane stress bellows biography
Sensor.
5. detection device according to claim 1, which is characterized in that the detection device further includes connector and display group
Part, the display component are connect by connector with the pressure detecting assembly, and the display component is for examining the pressure
Survey the pressure value digitlization display that component detection arrives.
6. a kind of detection method of piston turning moment, described using detection device as claimed in any one of claims 1 to 5
Detection method includes:
There is provided the executing agency of hydraulic system to be detected, the executing agency includes piston rod and oil cylinder, the piston rod
Both ends are separately positioned in two oil cylinders；
The detection device is installed in the executing agency；
When the piston rod moves reciprocatingly in two oil cylinders, the measured value of the pressure detecting assembly is recorded；
According to the axis at the midpoint of the measured value of the pressure detecting assembly and the pressure detecting assembly to the piston rod
Distance determines the turning moment of the piston rod.
7. detection method according to claim 6, which is characterized in that described that the detection device is installed to the execution
In mechanism, comprising:
The both ends of the guide rod are separately fixed on two oil cylinders, make the guide rod is parallel with the piston rod to set
It sets；
The pressure detecting assembly is respectively installed on the first baffle and second baffle of the guide support seat；
One end of guide support seat is assembled on the piston rod；
The distance between the guide rod and the first baffle and second baffle are adjusted, up to the guide rod to described first
The distance of baffle and the second baffle is setting value；
The guide support seat is fixed with the piston rod.
8. detection method according to claim 7, which is characterized in that adjust the guide rod and the first baffle and the
The distance between two baffles, until the guide rod to the distance of the first baffle and the second baffle is setting value, packet
It includes:
Adjust the guide rod being equidistant to the first baffle and second baffle, and the guide rod is to the first gear
The distance of plate and the second baffle is no more than 0.15mm.
9. detection method according to claim 7, which is characterized in that the detection method further include:
Measure the distance between the guide rod and the first baffle and second baffle respectively using clearance gauge.
10. detection method according to claim 6, which is characterized in that the measurement according to the pressure detecting assembly
It is worth the distance with the axis at the midpoint of the pressure detecting assembly to the piston rod, determines the turning moment of the piston rod,
Include:
Obtain the maximum value in the measured value of the pressure detecting assembly；
The midpoint of maximum value in the measured value of the pressure detecting assembly and the pressure detecting assembly is calculated to the piston
The product of the distance of the axis of bar；
The product is determined as to the turning moment of the piston rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910156436.2A CN110005658B (en) | 2019-03-01 | 2019-03-01 | Detection device and detection method for piston rotation torque |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910156436.2A CN110005658B (en) | 2019-03-01 | 2019-03-01 | Detection device and detection method for piston rotation torque |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110005658A true CN110005658A (en) | 2019-07-12 |
| CN110005658B CN110005658B (en) | 2020-11-24 |
Family
ID=67166224
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910156436.2A Active CN110005658B (en) | 2019-03-01 | 2019-03-01 | Detection device and detection method for piston rotation torque |
Country Status (1)
| Country | Link |
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| CN (1) | CN110005658B (en) |
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| CN101158609A (en) * | 2007-10-22 | 2008-04-09 | 浙江金华自动化仪表有限公司 | Force moment testing device of corner type electric actuating mechanism |
| CN102003381A (en) * | 2010-12-02 | 2011-04-06 | 长沙中联重工科技发展股份有限公司 | Device and method for monitoring stroke of pumping cylinder and optimal arrangement method of cushion hole |
| CN202362134U (en) * | 2011-12-01 | 2012-08-01 | 机化阀门(沈阳)有限公司 | Valve pressure and torque comprehensive testing device |
| CN103527563A (en) * | 2013-09-30 | 2014-01-22 | 天津工程机械研究院 | Hydraulic motor starting performance testing device and method |
-
2019
- 2019-03-01 CN CN201910156436.2A patent/CN110005658B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2844893Y (en) * | 2005-11-08 | 2006-12-06 | 张先和 | A kind of rotary torque proving installation of farinograph |
| CN200975933Y (en) * | 2006-06-30 | 2007-11-14 | 中国船舶重工集团公司第七一一研究所 | Servo motor type dynamic torque moment generating system |
| CN101158609A (en) * | 2007-10-22 | 2008-04-09 | 浙江金华自动化仪表有限公司 | Force moment testing device of corner type electric actuating mechanism |
| CN102003381A (en) * | 2010-12-02 | 2011-04-06 | 长沙中联重工科技发展股份有限公司 | Device and method for monitoring stroke of pumping cylinder and optimal arrangement method of cushion hole |
| CN202362134U (en) * | 2011-12-01 | 2012-08-01 | 机化阀门(沈阳)有限公司 | Valve pressure and torque comprehensive testing device |
| CN103527563A (en) * | 2013-09-30 | 2014-01-22 | 天津工程机械研究院 | Hydraulic motor starting performance testing device and method |
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| Publication number | Publication date |
|---|---|
| CN110005658B (en) | 2020-11-24 |
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