CN2702298Y - Reciprocal and rotary type integral frictional wear experiment machine - Google Patents
Reciprocal and rotary type integral frictional wear experiment machine Download PDFInfo
- Publication number
- CN2702298Y CN2702298Y CN 200420066416 CN200420066416U CN2702298Y CN 2702298 Y CN2702298 Y CN 2702298Y CN 200420066416 CN200420066416 CN 200420066416 CN 200420066416 U CN200420066416 U CN 200420066416U CN 2702298 Y CN2702298 Y CN 2702298Y
- Authority
- CN
- China
- Prior art keywords
- rotary
- slide block
- drive unit
- rotary disk
- pedestal
- 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.)
- Expired - Lifetime
Links
Images
Landscapes
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The utility model discloses a reciprocal and rotary type integral frictional wear experiment machine, comprising a base, a reciprocal mechanism, a rotary mechanism and an upper sampling controller. Wherein, the reciprocal mechanism comprises a reciprocal drive motor, slide blocks, a slide track, a crank and a connecting rod. The rotary mechanism comprises a rotary drive motor and a rotary disk. The upper sampling controller comprises an elastic arm, a guide track and a sliding support base or comprises an elastic arm, a rotary element and a base. The utility model combines the compound frictional wearing research machine and the rotary type frictional wearing research machine into an integrative structure through the base and the upper sampling controller which are specially designed. After such a structure is adopted and in the process of carrying two kinds of friction experiment to the same upper sample, the sample element does not be disassembled and the usage is stable and reliable to ensure the accuracy of the experiment data and lighten the workload of the experimenter.
Description
Technical field
The utility model relates to friction and wear tester, relates in particular to back and forth and the integrated friction and wear tester of rotary type.
Background technology
No matter existing friction and wear tester is reciprocating type experimental machine, still the rotary type experimental machine all can only be carried out single frictional wear experiment, when needs carry out two kinds of frictional wear experiments, then two experimental machine must be set correspondingly, so not only increased equipment investment, strengthen equipment occupation space, and made whole experiment loaded down with trivial details tediously long, increased experimenter's workload.
The utility model content
At the deficiency that prior art exists, the purpose of this utility model is to provide and can carries out two kinds of frictional wear experiments to the same sample of going up, and need not the reciprocal and integrated friction and wear tester of rotary type of dismounting sample coupon in experimentation.
For achieving the above object, a kind of integrated friction and wear tester of rotary type that back and forth reaches of the present utility model comprises pedestal, reciprocating mechanism, rotary mechanism and last specimen control device, wherein reciprocating mechanism comprises drive unit, slide block, slide rail, crank, connecting rod, crank is installed on the drive unit output shaft and by connecting rod and links to each other with slide block, slide rail is horizontally fixed on the pedestal, it is reciprocating that slide block drives the lower edge slide rail at drive unit, has down the sample mounting groove on the slide block; Rotary mechanism comprises drive unit, bearing, rotary disk, and bearing is fixed on the pedestal, and rotary disk is installed on the bearing by its back shaft is rotatable, and can rotate under the driving of drive unit, and the axis of rotation of rotary disk vertically is provided with; Last specimen control device comprises elastic arm, base, base is fixed on the described pedestal, base is provided with can be around the supporting member of its Z-axis rotation, elastic arm one end is installed on the supporting member by transverse axis is rotatable, the elastic arm other end is provided with specimen holder and counterweight bearing, track when specimen holder rotates with supporting member passes the top of rotary disk in the rotary mechanism, is provided with locking device between supporting member and the base.
For achieving the above object, another kind of the present utility model back and forth reaches the integrated friction and wear tester of rotary type and comprises pedestal, reciprocating mechanism, rotary mechanism and last specimen control device, wherein reciprocating mechanism comprises drive unit, slide block, slide rail, crank, connecting rod, crank is installed on the drive unit output shaft and by connecting rod and links to each other with slide block, slide rail is horizontally fixed on the pedestal, it is reciprocating that slide block drives the lower edge slide rail at drive unit, has down the sample mounting groove on the slide block; Rotary mechanism comprises drive unit, bearing, rotary disk, and bearing is fixed on the pedestal, and rotary disk is installed on the bearing by its back shaft is rotatable, and can rotate under the driving of drive unit, and the axis of rotation of rotary disk vertically is provided with; Last specimen control device comprises elastic arm, sliding support, base, base is fixed on the described pedestal, it is provided with guide rail, guide rail is provided with perpendicular to reciprocating mechanism direction of motion, sliding support slidably is installed on the guide rail on the base, elastic arm one end is installed on the sliding support by transverse axis is rotatable, the elastic arm other end is provided with specimen holder and counterweight bearing, track when specimen holder moves with sliding support passes the top of rotary disk in the rotary mechanism, is provided with locking device between guide rail and the sliding support.
Further, described guide rail is provided with rule.
Further, described crank is provided with a plurality of stationary links pin-and-holes with different turning radius, by the movement travel of this pin-and-hole scalable reciprocating mechanism slide block.
Further, have on the following sample mounting groove on the described reciprocating mechanism slide block and unload oilhole, this unloads the oilhole place and is provided with by-pass valve control; It is more shallow cup-shaped that the rotary disk of described rotary mechanism is, and its sidewall is provided with pilot hole.
Further, the rotary disk outer periphery of described rotary mechanism is equipped with a retaining oil jacket tube, and this retaining oil jacket tube is fixed on the described pedestal, and its bottom has outage.
Further, described pedestal is provided with the friction, lubrication fueller, comprises lubricating cup and oil pipe, and lubricating cup has certain altitude, fuel feeding in downward sample mounting groove of oil pipe and the rotary disk, and oil pipe is provided with adjusting control valve.
The utility model by designed base and last specimen control device with composite friction wear test machine and the rotary type friction and wear tester formula structure that is combined into one, after adopting such structure, successively carrying out in the process of two kinds of frictional experiments to sample on same, need not the dismounting sample coupon, use reliable and stablely, guaranteed the degree of accuracy of experimental data.
Description of drawings
Fig. 1 is reciprocating type friction synoptic diagram;
Fig. 2 is rotary friction synoptic diagram;
Fig. 3 is the structural representation of first kind of experimental machine of the utility model;
Fig. 4 is the plan structure synoptic diagram of Fig. 3;
Fig. 5 is for offering the structural representation of mounting groove on the slide block of reciprocating mechanism;
Fig. 6 is that the B of Fig. 5 is to view;
Fig. 7 is the synoptic diagram when adjusting elastic arm;
Fig. 8 is the cut-open view when carrying out reciprocating type frictional experiment;
Fig. 9 is the structural representation of the rotary disk of rotary mechanism;
Figure 10 is the A-A view of Fig. 9;
Figure 11 is the partial schematic diagram of rotary mechanism;
Figure 12 is the schematic top plan view during leaving certain gaps uncovered by the economic plan on the pedestal;
Figure 13 is the structural representation that second kind of experimental machine carried out the reciprocating friction experiment;
Figure 14 is the structural representation that second kind of experimental machine is rotated frictional experiment.
Embodiment:
Be illustrated in figure 1 as reciprocating type friction synoptic diagram, last sample 1 is fixed, following sample 2 is made horizontal reciprocating movement, Fig. 2 is rotary friction synoptic diagram, last sample 3 is fixed, following sample 4 rotates, at last sample 1, apply certain normal load N on the last sample 3, produce friction force F during friction, its size is determined that by F=N*f f is a friction factor, under same working condition, the result who is surveyed between the different antithesis friction pairs has comparability, and so-called " same working condition " just is meant identical friction mode, identical normal load, identical speed, identical stroke and identical lubricating condition.
As Fig. 3, first kind of experimental machine shown in Figure 4, whole experimental machine is by pedestal 10, reciprocating mechanism, rotary mechanism and last specimen control device are formed, wherein reciprocating mechanism is by reciprocal drive motor 5, slide block 6, slide rail 7 and crank connecting link are formed, crank connecting link comprises disk 8 and connecting rod 9, back and forth drive motor 5 drives disk 8 motions, disk 8 is rotationally connected with connecting rod 9, connecting rod 9 is hinged with slide block 6, slide block 6 is reciprocating under the drive of reciprocal drive motor 5, connecting rod 9 and slide block 6 are along plane motion during use, disk 8 is provided with the crank pin hole 13 of a plurality of crank length, by using different crank pin hole 13, can regulate the stroke of reciprocating mechanism.For preventing that testing the midplane generation beats, slide rail 7 fixes with pedestal 10 and is parallel with the upper surface of pedestal 10, adds the plane that will guarantee slide block 6 man-hour and beats less than 0.1mm, and slide rail 7 can be selected rolling guide for use, and the resistance of can reducing friction improves measuring accuracy.The concrete structure of mounting groove such as Figure 10, shown in Figure 11 on the slide block 6, have down the sample mounting groove on the slide block 6, have the threaded hole 11 that is used for fastening sample down on the cell wall of mounting groove and unload oilhole 12, to play sample to put into mounting groove during use, to play the sample chucking from two ends with holding screw then, certainly also can adopt other fixed form, fixing as playing sample to tie tight with elastic steel sheet 14 and screw 15.
Rotary mechanism is made up of rotary drive motor 16 and rotary disk 17, vertical and the rotary disk 17 and coaxial fixing of the rotating shaft of rotary drive motor 16 with rotary disk 17, the plane of rotation of rotary disk 17 is parallel with the upper surface of pedestal 10, the center of rotary disk 17 roughly is positioned on the perpendicular bisector of reciprocating mechanism slide rail 7, can be convenient to the location in the operating process like this.
Last specimen control device is by guide rail 18, sliding support 19 and elastic arm 20 are formed, guide rail 18 is provided with perpendicular to reciprocating mechanism direction of motion, rule 21 has been installed on the guide rail 18, so that accurately locate the position of sliding support 19, sliding support 19 is arranged on the guide rail 18, can be along moving forward and backward in the groove of guide rail 18, be provided with slide lock device between guide rail 18 and the sliding support 19, can be after moving to the precalculated position with elastic arm 20 lockings, elastic arm 20 1 ends and sliding support 19 are hinged by rotation axis, the other end is provided with anchor clamps, be used to clamp sample, the top of anchor clamps is provided with the inserting column that is used to place counterweight, in the experiment, applying of different load is that quality by changing counterweight realizes that the clamping center of anchor clamps also roughly is positioned on the perpendicular bisector of slide rail 7 on the reciprocating mechanism, so that regulate the location, back and forth drive motor 5 and rotary drive motor 16 all are arranged in the pedestal 10.
As Fig. 7, shown in Figure 8, after finishing rotary friction test, at first elastic arm 20 is lifted, move forward along guide rail then, the position of sample is corresponding with following sample position in the position clamping of elastic arm top, both contact, again with sliding support and guide rail locking, by the test of counterweight loading carrying out reciprocating friction.
Foil gauge is pasted in utilization on elastic arm 20 method can record required experiment parameter, selecting reciprocal or rotary mechanism when elastic arm clamping sample end does relative motion, the dynamic strain tester is installed in the friction experiment, is measured friction and produce strain, can obtain friction co-efficient value by calculating.
In frictional experiment, mainly contain dry friction, the oil lubrication of instillation formula and complete lubricated three kinds of lubricating condition, the utility model is also configurable as Fig. 3 for this reason, friction, lubrication fueller shown in Figure 4, form by lubricating cup 22 and oil pipe 23, with fueller suitably, the rotary disk of rotary mechanism adopts as Fig. 9, structure shown in Figure 10, it is more shallow cup-shaped that rotary disk becomes, sidewall is provided with pilot hole 24, as shown in figure 11, the bearing of rotary disk 26 becomes two sleeve shaped, and its inner sleeve 29 cooperates with the rotating shaft of rotary disk, the diameter of outer sleeve 25 and highly all greater than rotary disk 26, the inside bending in its top, spatter outside the lubricating oil in rotation process preventing, rest base has and unloads oil hole 27, oil seal between rotating shaft and the pedestal.Lubricating cup 22 has certain altitude, two oil-outs of oil pipe 23 respectively with following sample mounting groove and rotary disk intracavity inter-connection, oil pipe 23 is provided with adjusting control valve.
The certain distance because reciprocating mechanism and rotary mechanism stagger, therefore pedestal of the present utility model can be designed to structure as shown in figure 12, so not only saves manufacturing materials, and erect-position also is convenient to operation.
As Figure 13, second kind of experimental machine shown in Figure 14, reciprocating mechanism is identical with first kind of experimental machine with rotary mechanism, the support member of last specimen control device is made up of tumbler 30 and rotating stand 31, tumbler 30 rotatable being installed on the rotating stand 31, rotating stand is installed on the pedestal 32, elastic arm 33 is installed on the tumbler 30 by rotation axis or cradle head, be provided with the corner locking device between tumbler 30 and the rotating stand 31, the rotary disk 33 of rotary mechanism is arranged on the rotary motion trace at clamping center of anchor clamps, can regulate sample position with respect to the center of circle on rotary disk so easily, carry out different pivoting friction experiments.
Claims (7)
1, a kind of integrated friction and wear tester of rotary type that back and forth reaches, it is characterized in that, comprise pedestal, reciprocating mechanism, rotary mechanism and last specimen control device, wherein reciprocating mechanism comprises drive unit, slide block, slide rail, crank, connecting rod, crank is installed on the drive unit output shaft and by connecting rod and links to each other with slide block, slide rail is horizontally fixed on the pedestal, and it is reciprocating that slide block drives the lower edge slide rail at drive unit, has down the sample mounting groove on the slide block; Rotary mechanism comprises drive unit, bearing, rotary disk, and bearing is fixed on the pedestal, and rotary disk is installed on the bearing by its back shaft is rotatable, and can rotate under the driving of drive unit, and the axis of rotation of rotary disk vertically is provided with; Last specimen control device comprises elastic arm, base, base is fixed on the described pedestal, base is provided with can be around the supporting member of its Z-axis rotation, elastic arm one end is installed on the supporting member by transverse axis is rotatable, the elastic arm other end is provided with specimen holder and counterweight bearing, track when specimen holder rotates with supporting member passes the top of rotary disk in the rotary mechanism, is provided with locking device between supporting member and the base.
2, a kind of integrated friction and wear tester of rotary type that back and forth reaches, it is characterized in that, comprise pedestal, reciprocating mechanism, rotary mechanism and last specimen control device, wherein reciprocating mechanism comprises drive unit, slide block, slide rail, crank, connecting rod, crank is installed on the drive unit output shaft and by connecting rod and links to each other with slide block, slide rail is horizontally fixed on the pedestal, and it is reciprocating that slide block drives the lower edge slide rail at drive unit, has down the sample mounting groove on the slide block; Rotary mechanism comprises drive unit, bearing, rotary disk, and bearing is fixed on the pedestal, and rotary disk is installed on the bearing by its back shaft is rotatable, and can rotate under the driving of drive unit, and the axis of rotation of rotary disk vertically is provided with; Last specimen control device comprises elastic arm, sliding support, base, base is fixed on the described pedestal, it is provided with guide rail, guide rail is provided with perpendicular to reciprocating mechanism direction of motion, sliding support slidably is installed on the guide rail on the base, elastic arm one end is installed on the sliding support by transverse axis is rotatable, the elastic arm other end is provided with specimen holder and counterweight bearing, track when specimen holder moves with sliding support passes the top of rotary disk in the rotary mechanism, is provided with locking device between guide rail and the sliding support.
3, a kind of integrated friction and wear tester of rotary type that back and forth reaches as claimed in claim 2 is characterized in that described guide rail is provided with rule.
4, a kind of integrated friction and wear tester of rotary type that back and forth reaches as claimed in claim 2, it is characterized in that, described crank is provided with a plurality of stationary links pin-and-holes with different turning radius, by the movement travel of this pin-and-hole scalable reciprocating mechanism slide block.
5, a kind of integrated friction and wear tester of rotary type that back and forth reaches as claimed in claim 2 is characterized in that have on the following sample mounting groove on the described reciprocating mechanism slide block and unload oilhole, this unloads the oilhole place and is provided with by-pass valve control; It is more shallow cup-shaped that the rotary disk of described rotary mechanism is, and its sidewall is provided with pilot hole.
6, a kind of integrated friction and wear tester of rotary type that back and forth reaches as claimed in claim 2 is characterized in that, the rotary disk outer periphery of described rotary mechanism is equipped with a retaining oil jacket tube, and this retaining oil jacket tube is fixed on the described bearing, and its bottom has outage.
7, a kind of integrated friction and wear tester of rotary type that back and forth reaches as claimed in claim 2, it is characterized in that, described pedestal is provided with the friction, lubrication fueller, comprise lubricating cup and oil pipe, lubricating cup has certain altitude, downward sample mounting groove of oil pipe and rotary disk fuel feeding, oil pipe is provided with adjusting control valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420066416 CN2702298Y (en) | 2004-06-18 | 2004-06-18 | Reciprocal and rotary type integral frictional wear experiment machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420066416 CN2702298Y (en) | 2004-06-18 | 2004-06-18 | Reciprocal and rotary type integral frictional wear experiment machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2702298Y true CN2702298Y (en) | 2005-05-25 |
Family
ID=34777769
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420066416 Expired - Lifetime CN2702298Y (en) | 2004-06-18 | 2004-06-18 | Reciprocal and rotary type integral frictional wear experiment machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2702298Y (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102213662A (en) * | 2010-04-07 | 2011-10-12 | 鸿富锦精密工业（深圳）有限公司 | Device and method for testing abrasion performance of abrasive paper |
| CN102680342A (en) * | 2011-03-10 | 2012-09-19 | 鸿富锦精密工业（深圳）有限公司 | Test device |
| CN102998103A (en) * | 2012-08-20 | 2013-03-27 | 昆山洺九机电有限公司 | Lift tester for laptop feet |
| CN103267459A (en) * | 2013-05-16 | 2013-08-28 | 国家电网公司 | Spacer rod cable clamp joint abrasion tester |
| CN104792546A (en) * | 2015-04-21 | 2015-07-22 | 苏州泰克诺机电有限公司 | Automobile seat slide rail running-in testing station |
| CN105115844A (en) * | 2015-09-24 | 2015-12-02 | 广东越联仪器有限公司 | Abrasion tester for testing abrasion performance of centralizer |
| CN105628537A (en) * | 2016-03-17 | 2016-06-01 | 中国石油大学(华东) | Experiment device for simulating sucker rod and oil pipe abrasion and corrosion environment |
| CN105806725A (en) * | 2014-12-29 | 2016-07-27 | 核工业西南物理研究院 | Metal shaft surface wear and fatigue test device |
| CN106353213A (en) * | 2016-09-29 | 2017-01-25 | 华南理工大学 | Friction abrasion testing machine |
| CN106908380A (en) * | 2017-03-31 | 2017-06-30 | 苏子昊 | A kind of use for laboratory frictional behaviour experimental rig |
| CN107598479A (en) * | 2017-10-24 | 2018-01-19 | 湖北航嘉麦格纳座椅***有限公司 | A kind of running-in machine and control method for sliding rail of automobile seat break-in |
| CN109443968A (en) * | 2018-12-20 | 2019-03-08 | 山东大学 | A kind of guiding rail friction wear testing machine and test method |
| CN109932264A (en) * | 2019-02-26 | 2019-06-25 | 天津大学 | Multifunction friction wear vacuum experiment machine |
-
2004
- 2004-06-18 CN CN 200420066416 patent/CN2702298Y/en not_active Expired - Lifetime
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102213662A (en) * | 2010-04-07 | 2011-10-12 | 鸿富锦精密工业（深圳）有限公司 | Device and method for testing abrasion performance of abrasive paper |
| CN102680342A (en) * | 2011-03-10 | 2012-09-19 | 鸿富锦精密工业（深圳）有限公司 | Test device |
| CN102998103A (en) * | 2012-08-20 | 2013-03-27 | 昆山洺九机电有限公司 | Lift tester for laptop feet |
| CN103267459A (en) * | 2013-05-16 | 2013-08-28 | 国家电网公司 | Spacer rod cable clamp joint abrasion tester |
| CN103267459B (en) * | 2013-05-16 | 2015-09-23 | 国家电网公司 | Spacer rod cable clamp joint abrasion tester |
| CN105806725A (en) * | 2014-12-29 | 2016-07-27 | 核工业西南物理研究院 | Metal shaft surface wear and fatigue test device |
| CN104792546A (en) * | 2015-04-21 | 2015-07-22 | 苏州泰克诺机电有限公司 | Automobile seat slide rail running-in testing station |
| CN104792546B (en) * | 2015-04-21 | 2017-09-29 | 苏州泰克诺机电有限公司 | Sliding rail of automobile seat break-in testing station |
| CN105115844A (en) * | 2015-09-24 | 2015-12-02 | 广东越联仪器有限公司 | Abrasion tester for testing abrasion performance of centralizer |
| CN105628537A (en) * | 2016-03-17 | 2016-06-01 | 中国石油大学(华东) | Experiment device for simulating sucker rod and oil pipe abrasion and corrosion environment |
| CN106353213A (en) * | 2016-09-29 | 2017-01-25 | 华南理工大学 | Friction abrasion testing machine |
| CN106353213B (en) * | 2016-09-29 | 2023-03-21 | 华南理工大学 | Friction wear testing machine |
| CN106908380A (en) * | 2017-03-31 | 2017-06-30 | 苏子昊 | A kind of use for laboratory frictional behaviour experimental rig |
| CN107598479A (en) * | 2017-10-24 | 2018-01-19 | 湖北航嘉麦格纳座椅***有限公司 | A kind of running-in machine and control method for sliding rail of automobile seat break-in |
| CN109443968A (en) * | 2018-12-20 | 2019-03-08 | 山东大学 | A kind of guiding rail friction wear testing machine and test method |
| CN109443968B (en) * | 2018-12-20 | 2023-11-14 | 山东大学 | Guide rail friction and wear testing machine and testing method |
| CN109932264A (en) * | 2019-02-26 | 2019-06-25 | 天津大学 | Multifunction friction wear vacuum experiment machine |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1267719C (en) | Reciprocal and rotary type incorporated frictional wear test machine | |
| CN2702298Y (en) | Reciprocal and rotary type integral frictional wear experiment machine | |
| CN203231962U (en) | End twist friction and abrasion tester for dynamically observing friction interface in real time | |
| CN2856976Y (en) | Testing tool for push-pull force | |
| CN211904967U (en) | Rotation type friction wear testing machine | |
| CN2849705Y (en) | Reciprocating friction wear tester for femur | |
| CN108534935B (en) | - three contact of incline plane simple sliding operating condition fretting wear of one bulb and measuring lubricating oil film device | |
| CN107063992B (en) | Low-speed light-load electrochemical friction testing machine | |
| CN108931453A (en) | Small-sized pin disk-type friction abrasion tester | |
| CN1916654A (en) | Testing device of magnetic suspension of high-temperature superconductor, and testing method for using the device | |
| CN109781570B (en) | High-frequency reciprocating friction wear testing machine | |
| CN111272535A (en) | Fretting sliding composite friction and wear test system and operation method thereof | |
| CN106813999A (en) | A kind of portable friction abrasion test device | |
| CN2460983Y (en) | Fabric lousiness pilling instrument | |
| CN110320124A (en) | A kind of reciprocating corrosion fretting apparatus | |
| CN108507480A (en) | A kind of slipper bearing lubricating oil film and frictional force real-time measurement apparatus | |
| CN2748904Y (en) | Rock direct shear test machine | |
| CN2826406Y (en) | Normal surface measuring friction wear testing machine | |
| CN110672321B (en) | Device for measuring radial load deformation of bearing | |
| CN115854817B (en) | Middle shell thread detection device and detection method | |
| CN2348377Y (en) | Test device for surface friction properties of wire | |
| CN109813239B (en) | Cam-tappet contact pair lubricating oil film measuring instrument and use method thereof | |
| CN2879170Y (en) | Direct cutting instrument | |
| CN109974650A (en) | Plain thrust bearing retainer clearance detector and method | |
| CN113820233B (en) | Low-temperature reciprocating tribology tester soaked by liquid nitrogen medium and testing method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Effective date of abandoning: 20040618 |
|
| AV01 | Patent right actively abandoned |
Effective date of abandoning: 20040618 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |