CN107014599B - Follow-up type passive servo loading device and load acquisition method - Google Patents
Follow-up type passive servo loading device and load acquisition method Download PDFInfo
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- CN107014599B CN107014599B CN201710365420.3A CN201710365420A CN107014599B CN 107014599 B CN107014599 B CN 107014599B CN 201710365420 A CN201710365420 A CN 201710365420A CN 107014599 B CN107014599 B CN 107014599B
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- loaded object
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/161—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load
-
- 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
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention relates to a follow-up passive servo loading device and a load acquisition method, comprising a loaded object sliding rail and a base, wherein the loaded object sliding rail is fixedly arranged on the base, and the loaded object is arranged on the loaded object sliding rail and can slide on the loaded object sliding rail; the loaded object is always contacted with a follower mechanism which is used for acquiring displacement and synchronously moves along with the loaded object, and the follower mechanism is connected with a pressure output mechanism which is used for acquiring loading force. The follow-up mechanism obtains the displacement of the loaded object through close contact with the loaded object, drives the pressure output mechanism to move through the follow-up mechanism, and obtains the magnitude of the loading force through the pressure output mechanism, and has the advantages of timely and accurate pressure acquisition, and is sensitive to the displacement of the loaded object and the loading load. The response frequency of the system is far greater than the motion frequency of the loaded object, and the timeliness and accuracy of the system response can be improved.
Description
Technical Field
The invention belongs to the technical field of test platforms, and particularly relates to a follow-up passive servo loading device and a load acquisition method.
Background
Along with the increasing demands of society on large-scale high-precision equipment, the demands of part loading test tables are increased, and the requirements on timeliness and accuracy of obtaining loads are also improved continuously. The main problem of the conventional passive loading laboratory bench using a hydraulic cylinder with a flow valve is that the loading system can only be applied to the state of a small-rigidity loaded object.
F＝kx
For the state of a small stiffness loaded object, k is a finite value, and when F is fixed, x can be precisely controlled.
For the state of a large-rigidity loaded object, k is infinite, and when F is fixed, x is small and cannot be controlled accurately.
The performance of the pressure valve is only related to the size of the hydraulic cylinder cavity, the response bandwidth of the pressure valve is far smaller than the corresponding bandwidth of the flow valve, and the pressure valve cannot meet the requirement when the movement frequency of the loaded object is large.
Disclosure of Invention
The invention aims to overcome the problems in the prior art and provides a follow-up passive servo loading device and a load acquisition method, which can be sensitive to the displacement and loading load of a loaded object at the same time and meet the loading requirement.
In order to achieve the above purpose, the device of the invention adopts the following technical scheme:
the device comprises a loaded object sliding rail and a base, wherein the loaded object sliding rail is fixedly arranged on the base, and a loaded object is arranged on the loaded object sliding rail and can slide on the loaded object sliding rail; the loaded object is always contacted with a follower mechanism which is used for acquiring displacement and synchronously moves along with the loaded object, and the follower mechanism is connected with a pressure output mechanism which is used for acquiring loading force.
Further, the follow-up mechanism comprises a follow-up valve and a follow-up hydraulic cylinder, wherein the follow-up hydraulic cylinder is fixedly arranged on the base, and a piston rod of the follow-up hydraulic cylinder is fixedly connected with the pressure output mechanism; the piston of the follower valve is always in contact with the object to be loaded.
Further, the follower valve adopts a flow valve.
Further, the pressure output mechanism comprises a pressure hydraulic cylinder and a follow-up platform, the pressure hydraulic cylinder is fixed on the base, and the follow-up platform is arranged on the base and can slide relative to the base; the piston rod of the follow-up hydraulic cylinder is fixedly connected with the follow-up platform.
Further, the pressure hydraulic cylinder is a hydraulic cylinder with a pressure valve.
Further, the follower platform is mounted on the base by a follower platform sliding mechanism.
The method adopts the following technical scheme:
the method comprises the following steps:
step one: the method comprises the steps that a loaded object is mounted on a base through a loaded object sliding rail, the loaded object is always in contact with a follow-up valve for opening a follow-up hydraulic cylinder, a piston rod of the follow-up hydraulic cylinder is connected with a piston rod of a pressure hydraulic cylinder through a follow-up platform, the follow-up hydraulic cylinder and the pressure hydraulic cylinder are fixedly mounted on the base, and the pressure hydraulic cylinder is provided with a pressure valve;
step two: the loaded object slides, the follow-up valve is passively pulled and opened, and an oil way is conducted, so that hydraulic oil rapidly enters a containing cavity of the follow-up hydraulic cylinder, and a piston rod of the follow-up hydraulic cylinder moves and pushes a follow-up platform to move;
step three: the follow-up platform pushes a piston rod of the pressure hydraulic cylinder to move, the internal pressure of the pressure hydraulic cylinder changes, the internal pressure of the pressure hydraulic cylinder is balanced by opening the pressure valve, and a pressure value is output to obtain a follow-up passive servo loading load.
Compared with the prior art, the invention has the following beneficial technical effects:
the follow-up mechanism obtains the displacement of the loaded object through close contact with the loaded object, drives the pressure output mechanism to move through the follow-up mechanism, and obtains the magnitude of loading force through the pressure output mechanism. The response frequency of the system is far greater than the motion frequency of the loaded object, and the timeliness and accuracy of the system response can be improved. The system has high rigidity and avoids the damage of the system caused by insufficient rigidity. The system has simple structure, low cost, convenient popularization and wide application prospect, and can achieve instant pressure output.
Furthermore, the invention uses the mechanical-hydraulic servo mechanism, thereby greatly reducing the error of electric control transmission and improving the accuracy of obtaining the load.
The method adopts two hydraulic cylinders, which are respectively provided with a flow valve sensitive to displacement and a pressure valve sensitive to pressure, so that the two hydraulic cylinders are respectively sensitive to displacement and pressure, the two hydraulic cylinders are organically combined together through the follow-up platform similar to a lever, and the follow-up mechanism is always in close contact with a loaded object.
Drawings
Fig. 1 is a schematic view of the apparatus of the present invention.
1-a follower mechanism; 2-a loaded object sliding mechanism; 3-a pressure output mechanism; 4-a follower valve; 5-a follow-up hydraulic cylinder; 6-a loaded object; 7-a loaded object slide rail; 8-a pressure hydraulic cylinder; 9-a follow-up platform; 10-a follower platform sliding mechanism; 11-a base.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings.
Referring to fig. 1, the apparatus of the present invention comprises: a follower mechanism 1, a sliding mechanism 2 to be loaded, a pressure output mechanism 3, and a base 11.
The follower mechanism 1 includes a follower valve 4 and a follower hydraulic cylinder 5. The loaded object sliding mechanism 2 includes a loaded object 6 and a loaded object slide rail 7. The pressure output mechanism 3 includes a pressure hydraulic cylinder 8, a follower platform 9, and a follower platform sliding mechanism 10.
The slave cylinder 5 is a cylinder with a slave valve 4 and is sensitive to displacement. The follow-up valve 4 is a valve of the follow-up hydraulic cylinder 5, is directly connected with the follow-up hydraulic cylinder 5 and is fixedly arranged at the top of the follow-up hydraulic cylinder 5; the follower valve 4 adopts a flow valve, and the piston of the follower valve 4 is always in close contact with the loaded object 6; the displacement of the piston of the slave valve 4 is correlated with the displacement of the object 6 to be loaded and causes the piston rod of the slave cylinder 5 to move, i.e. the piston rod of the slave cylinder 5 moves with the movement of the object 6 to be loaded, forming a slave. The follow-up hydraulic cylinder 5 is fixed on the base 11; the piston rod of the follow-up hydraulic cylinder 5 drives the follow-up platform 9 to move.
The loaded object 6 is connected with the loaded object sliding rail 7 and can slide freely. The object slide rail 7 is fixed to the base 11. The relative movement of the loaded object 6 and the base 11 is achieved by the relative sliding of the loaded object 6 and the loaded object slide rail 7.
The pressure cylinder 8 is fixed to the base 11. The pressure cylinder 8 is a cylinder with a pressure valve, and is sensitive to pressure. The piston rod of the pressure hydraulic cylinder 8 is connected with the follow-up platform 9. The pressure cylinder 8 obtains the magnitude of the load applied to the object 6 to be loaded through the pressure valve. The follower platform 9 is connected to the base 11 by a follower platform sliding mechanism 10. The follower platform 9 is moved relative to the base 11 by a follower platform slide mechanism 10.
The follower mechanism 1 obtains the displacement amount of the object 6 by close contact with the object 6, the displacement amount is transmitted to the pressure cylinder 8 by the follower platform 9, and the magnitude of the load applied to the object 6 is obtained by the pressure cylinder 8. The following mechanism 1 obtains the displacement of the loaded object 6 through close contact with the loaded object 6, causes the following platform 9 to displace, the displacement of the following platform 9 causes the piston rod of the pressure hydraulic cylinder 8 connected with the following platform to displace, the pressure change occurs in the pressure hydraulic cylinder 8, the pressure hydraulic cylinder 8 is provided with a pressure valve, the pressure valve is sensitive to pressure and insensitive to displacement, so when the pressure change occurs in the hydraulic cylinder, the pressure valve is actively controlled to be opened, the pressure of the pressure hydraulic cylinder 8 is balanced, and then the pressure value is output.
The invention mainly works in the process and principle:
when the sliding device is used, the piston of the follow-up valve 4 is always in close contact with the loaded object 6, the loaded object 6 can freely slide through being connected with the loaded object sliding rail 7, the follow-up hydraulic cylinder 5 is connected with the pressure hydraulic cylinder 8 through the follow-up platform 9, displacement is transmitted to the pressure hydraulic cylinder 8, and the follow-up platform 9 is connected with the follow-up platform sliding mechanism 10 to realize free sliding.
When the loaded object 6 slides to generate displacement, the follow-up valve 4 is pulled passively, the follow-up valve 4 adopts a flow valve, the flow valve is sensitive to displacement and insensitive to pressure, so that when the follow-up valve 4 is pulled, the displacement of the loaded object 6 is obtained, the valve is opened immediately, the follow-up valve 4 is opened, an oil way is conducted, hydraulic oil rapidly enters a cavity of the follow-up hydraulic cylinder 5, a piston rod of the follow-up hydraulic cylinder 5 is caused to move, the piston rod of the follow-up hydraulic cylinder 5 pushes a follow-up platform 9 to move, the follow-up platform 9 drives the piston rod of the hydraulic cylinder 8 to move, the displacement is transmitted to the hydraulic cylinder 8, the piston rod of the hydraulic cylinder 8 is displaced, the pressure inside the hydraulic cylinder 8 is changed, and the pressure valve sensitive to the pressure inside the hydraulic cylinder 8 is opened at the moment, so that the load size loaded by the loaded object 6 can be obtained rapidly.
Aiming at various defects of the existing loading test bed, the invention provides a novel follow-up type passive servo loading device, which adopts a hydraulic cylinder with a pressure valve and a hydraulic cylinder with a flow valve respectively, and organically combines a follow-up hydraulic cylinder 5 and a pressure hydraulic cylinder 8 through a follow-up platform 9 similar to a lever, so that the purposes of being sensitive to displacement and rapidly obtaining load are achieved, the defect that a single hydraulic cylinder cannot effectively react to two different parameters at the same time in the prior loading system is overcome, the response frequency of the system is far greater than the motion frequency of an object to be loaded, the timeliness and the accuracy of the response of the system are improved, the rigidity of the system is higher, the system is prevented from being damaged due to insufficient rigidity, the device adopts a mechanical-hydraulic servo mechanism, the error of electric control transmission is greatly reduced, the accuracy of obtaining the load is improved, and the system has simple structure and low cost and is convenient to popularize.
According to the invention, the follow-up mechanism 1 is in close contact with the loaded object 6 to obtain the displacement of the loaded object 6, the follow-up platform 9 is driven to move by the follow-up hydraulic cylinder 5, the follow-up platform 9 is connected with the pressure output device, the displacement is transmitted to the pressure hydraulic cylinder 8 by the follow-up platform 9, and the magnitude of loading force is obtained by the pressure output mechanism.
Claims (4)
1. A follow-up type passive servo loading device is characterized in that: the device comprises a loaded object sliding rail (7) and a base (11), wherein the loaded object sliding rail (7) is fixedly arranged on the base (11), and a loaded object (6) is arranged on the loaded object sliding rail (7) and can slide on the loaded object sliding rail (7); the loaded object (6) is always contacted with a follower mechanism (1) which is used for acquiring displacement and synchronously moves along with the loaded object (6), and the follower mechanism (1) is connected with a pressure output mechanism (3) which is used for acquiring loading force;
the follow-up mechanism (1) comprises a follow-up valve (4) and a follow-up hydraulic cylinder (5), wherein the follow-up hydraulic cylinder (5) is fixedly arranged on the base (11), and a piston rod of the follow-up hydraulic cylinder (5) is fixedly connected with the pressure output mechanism (3); the piston of the follower valve (4) is always in contact with the object (6) to be loaded;
the pressure output mechanism (3) comprises a pressure hydraulic cylinder (8) and a follow-up platform (9), the pressure hydraulic cylinder (8) is fixed on the base (11), and the follow-up platform (9) is arranged on the base (11) and can slide relative to the base (11); a piston rod of the follow-up hydraulic cylinder (5) is fixedly connected with the follow-up platform (9);
the load acquisition method comprises the following steps:
step one: the method comprises the steps that a loaded object (6) is mounted on a base (11) through a loaded object sliding rail (7), the loaded object (6) and a follow-up valve (4) for opening a follow-up hydraulic cylinder (5) are always kept in contact, a piston rod of the follow-up hydraulic cylinder (5) is connected with a piston rod of a pressure hydraulic cylinder (8) through a follow-up platform (9), the follow-up hydraulic cylinder (5) and the pressure hydraulic cylinder (8) are fixedly mounted on the base (11), and the pressure hydraulic cylinder (8) is provided with a pressure valve;
step two: the loaded object (6) slides, the follow-up valve (4) is passively pulled and opened, and an oil way is conducted, so that hydraulic oil rapidly enters a containing cavity of the follow-up hydraulic cylinder (5), and a piston rod of the follow-up hydraulic cylinder (5) moves and pushes the follow-up platform (9) to move;
step three: the follow-up platform (9) pushes a piston rod of the pressure hydraulic cylinder (8) to move, the internal pressure of the pressure hydraulic cylinder (8) changes, the internal pressure of the pressure hydraulic cylinder (8) is balanced by opening the pressure valve, and a pressure value is output to obtain a follow-up passive servo loading load.
2. A passive servo loading device as recited in claim 1, wherein: the follow-up valve (4) adopts a flow valve.
3. A passive servo loading device as recited in claim 1, wherein: the pressure hydraulic cylinder (8) is a hydraulic cylinder with a pressure valve.
4. A passive servo loading device as recited in claim 1, wherein: the follow-up platform (9) is arranged on the base (11) through a follow-up platform sliding mechanism (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710365420.3A CN107014599B (en) | 2017-05-22 | 2017-05-22 | Follow-up type passive servo loading device and load acquisition method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710365420.3A CN107014599B (en) | 2017-05-22 | 2017-05-22 | Follow-up type passive servo loading device and load acquisition method |
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| Publication Number | Publication Date |
|---|---|
| CN107014599A CN107014599A (en) | 2017-08-04 |
| CN107014599B true CN107014599B (en) | 2023-08-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710365420.3A Active CN107014599B (en) | 2017-05-22 | 2017-05-22 | Follow-up type passive servo loading device and load acquisition method |
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| CN113465906B (en) * | 2021-07-30 | 2023-12-26 | 杭州高驰智能装备有限公司 | EOL test mechanism of door actuator and working method thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1425712A (en) * | 1973-01-24 | 1976-02-18 | Dewandre Co Ltd C | Apportioning valves for vehicle braking systems |
| JPH05172667A (en) * | 1991-12-20 | 1993-07-09 | Nippon Gear Co Ltd | Stem shaft thrust load measuring apparatus for valve actuator |
| JP2006192570A (en) * | 2006-04-14 | 2006-07-27 | Oks Co Ltd | Method for suppressing chatter of workpiece, and device for supporting workpiece |
| CN103543013A (en) * | 2013-10-17 | 2014-01-29 | 华中科技大学 | Static-pressure axial-radial loading mechanism |
| CN203534823U (en) * | 2013-10-17 | 2014-04-09 | 华中科技大学 | Hydrostatic bearing radial loading mechanism |
| CN206847920U (en) * | 2017-05-22 | 2018-01-05 | 西安交通大学 | A kind of passive servo-loading unit of trailing type |
-
2017
- 2017-05-22 CN CN201710365420.3A patent/CN107014599B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1425712A (en) * | 1973-01-24 | 1976-02-18 | Dewandre Co Ltd C | Apportioning valves for vehicle braking systems |
| JPH05172667A (en) * | 1991-12-20 | 1993-07-09 | Nippon Gear Co Ltd | Stem shaft thrust load measuring apparatus for valve actuator |
| JP2006192570A (en) * | 2006-04-14 | 2006-07-27 | Oks Co Ltd | Method for suppressing chatter of workpiece, and device for supporting workpiece |
| CN103543013A (en) * | 2013-10-17 | 2014-01-29 | 华中科技大学 | Static-pressure axial-radial loading mechanism |
| CN203534823U (en) * | 2013-10-17 | 2014-04-09 | 华中科技大学 | Hydrostatic bearing radial loading mechanism |
| CN206847920U (en) * | 2017-05-22 | 2018-01-05 | 西安交通大学 | A kind of passive servo-loading unit of trailing type |
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| CN107014599A (en) | 2017-08-04 |
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