CN112730218B - Vacuum energy storage mechanism of material friction abnormal sound test bed - Google Patents
Vacuum energy storage mechanism of material friction abnormal sound test bed Download PDFInfo
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- CN112730218B CN112730218B CN202110054265.XA CN202110054265A CN112730218B CN 112730218 B CN112730218 B CN 112730218B CN 202110054265 A CN202110054265 A CN 202110054265A CN 112730218 B CN112730218 B CN 112730218B
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- 238000004146 energy storage Methods 0.000 title claims abstract description 119
- 230000002159 abnormal effect Effects 0.000 title claims abstract description 30
- 239000000463 material Substances 0.000 title claims abstract description 24
- 230000007246 mechanism Effects 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 claims description 22
- 230000008569 process Effects 0.000 claims description 22
- 230000033001 locomotion Effects 0.000 claims description 20
- 230000009471 action Effects 0.000 claims description 13
- 238000003825 pressing Methods 0.000 claims description 8
- 230000008602 contraction Effects 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 238000001179 sorption measurement Methods 0.000 claims description 3
- 230000001133 acceleration Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 11
- 230000009286 beneficial effect Effects 0.000 description 7
- 238000006073 displacement reaction Methods 0.000 description 4
- 230000006872 improvement Effects 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/02—Measuring coefficient of friction between materials
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention relates to the technical field of friction abnormal sound experimental equipment, in particular to a vacuum energy storage mechanism of a material friction abnormal sound experimental bench, which comprises a supporting bench, a moving bench, an energy storage unit and an objective table, wherein the moving bench is arranged on the supporting bench in a sliding manner, the energy storage unit comprises an energy storage barrel, an energy storage plug, a traction piece and an energy storage block, the energy storage plug is arranged in the energy storage barrel in a sliding manner, the energy storage plug is connected with the energy storage block through the traction piece, and the energy storage block is positioned between the moving bench and the objective table. By adopting the technical scheme, the stick-slip phenomenon of the material during friction can be accurately measured.
Description
Technical Field
The invention relates to the technical field of friction abnormal sound experimental equipment, in particular to a vacuum energy storage mechanism of a material friction abnormal sound test bed.
Background
The abnormal sound is noise generated by the fact that the relative motion between two parts exceeds a critical value, and along with the improvement of the requirements of consumers on the quality of automobiles, the abnormal sound control of the automobiles becomes one of key contents of the automobile. The friction abnormal sound is a common abnormal sound problem which is difficult to solve on an automobile, the reason for the friction abnormal sound is the stick-slip phenomenon of the material during friction, and the risk of the friction abnormal sound of the material can be evaluated by evaluating the stick-slip phenomenon of the material during friction.
The existing test method is that one sample is fixed on an objective table, the other sample is fixed on a pressing block above, the pressing block presses the two samples, meanwhile, friction among the samples is realized through reciprocating motion of the objective table, parameters such as friction coefficient, noise and the like during friction are tested, and friction abnormal sound performance of a material pair is evaluated. As the stick-slip phenomenon cannot be effectively found in the characteristics such as the friction coefficient obtained by the test, the evaluation of the friction abnormal sound performance of the material is affected.
Disclosure of Invention
The invention aims to provide a vacuum energy storage mechanism capable of accurately measuring the stick-slip phenomenon of sample materials during friction.
In order to achieve the above purpose, the technical scheme of the invention provides a vacuum energy storage mechanism of a material friction abnormal sound test bed, which comprises a supporting table, a moving table, an energy storage unit and an objective table, wherein the moving table is arranged on the supporting table in a sliding manner, the energy storage unit comprises an energy storage barrel, an energy storage plug, a traction piece and an energy storage block, the energy storage plug is arranged in the energy storage barrel in a sliding manner, the energy storage plug is connected with the energy storage block through the traction piece, and the energy storage block is positioned between the moving table and the objective table.
The technical effect of this scheme is: when the material generates stick-slip to friction, the energy storage mechanism can gather energy in the viscous process, and can release energy in the sliding process, so that the friction coefficient tested when the stick-slip phenomenon occurs has obvious stick-slip characteristics, and the abnormal sound performance of the material in friction can be evaluated by evaluating the characteristics of the stick-slip phenomenon.
Further, the device also comprises a slow pushing unit, wherein the slow pushing unit comprises a supporting rod, a sleeve, an output shaft, a magnet and an elastic piece, the supporting rod is in a shape like a Chinese character 'ji', one end of the sleeve is closed, the end of the sleeve is connected with the moving table through the supporting rod, the output shaft is arranged in the sleeve in a sliding manner, and a clamping groove is formed in the output shaft; the inner side wall of the sleeve is provided with a concave cavity, a clamping block in a shape is arranged in the concave cavity in a sliding manner, and the clamping block is connected with the bottom of the concave cavity through an elastic piece; the magnet is connected with the traction piece, and the magnet can drive the clamping block to slide and separate the clamping block from the output shaft. The technical effect of this scheme is: when friction between sample pieces is tested, the output shaft is contacted with the clamping block in the extending process and pushes the sleeve, the supporting rod, the moving table, the energy storage block and the objective table to move through the clamping block, so that the sample pieces on the objective table and the sample pieces on the pressing block are uniformly rubbed, and abnormal sound displacement is accurately calculated;
the energy storage block is driven to move in the moving process of the moving table, so that the energy storage plug is driven to slide relative to the energy storage barrel through the traction piece, the negative pressure state is displayed in the energy storage barrel, and the magnet is driven to move in the moving process of the traction piece;
when the sleeve moves to the upper part of the magnet and the output shaft is about to extend to the limit state, the clamping block is separated from the output shaft under the adsorption action of the magnet, the output shaft does not act on the sleeve any more, the output shaft is in the sleeve to be in deceleration extension until the sleeve is extended to the limit state, and then the output shaft is in reverse acceleration contraction and gradually increases the speed to uniform speed contraction;
in the process of decelerating and elongating the output shaft in the sleeve, the output shaft is separated from the clamping block, so that the output shaft does not act on the motion platform any more, the transmission of the setback generated in the reversing process of the output shaft to the motion platform is avoided, the smooth movement of the motion platform is beneficial to accurately measuring the friction force between sample pieces, and the judgment of the friction performance of the sample pieces is facilitated to be improved, namely, the abnormal sound displacement is accurately calculated;
in the process that the output shaft is reversely contracted after the deceleration and the extension in the sleeve, the energy storage block and the moving table reversely move under the action of negative pressure in the energy storage barrel, the magnet on the traction piece reversely moves under the action of the energy storage plug, the magnet does not adsorb the clamping block any more, and the clamping block is reset under the action of the elastic piece; when the output shaft is contacted with the clamping block again, the output shaft and the clamping block are in a moving state, and after the output shaft is contacted, the output shaft can drive the sleeve, the support rod, the moving table, the energy storage block and the objective table to move reversely through the clamping block, so that friction between sample pieces is tested;
according to the invention, the energy storage unit and the buffer unit are matched, so that the invention concept of reverse movement relay is provided, the friction state between the sample pieces is ensured not to be changed drastically, and the judgment of the friction performance of the sample pieces is facilitated to be improved.
Further, the energy storage unit further comprises a pulley, one end of the traction piece is connected with the energy storage plug, and the other end of the traction piece bypasses the pulley and is connected with the energy storage block. The technical effect of this scheme is: the traction piece is beneficial to pulling the energy storage block in the horizontal direction, and meanwhile, the traction piece is beneficial to pulling the energy storage plug in the vertical direction.
Further, the cross section of the traction piece is square. The technical effect of this scheme is: the traction piece is relatively stable in the moving process, and the magnet is prevented from rotating around the traction piece in the circumferential direction.
Further, the pulley is I-shaped. The technical effect of this scheme is: the traction piece is limited through the pulley, so that the stability of the traction piece is further improved.
Further, the number of the energy storage units is two, and the two energy storage units are respectively positioned at two ends of the supporting table. The technical effect of this scheme is: the setting of one energy storage unit can satisfy the reciprocating stable movement of the supporting table for one time, and the setting of two energy storage units can satisfy the reciprocating stable movement of the supporting table for a plurality of times, thereby being more beneficial to the judgment of improving the friction performance of the sample.
Further, the device also comprises a frame and a gas spring, wherein the frame is positioned at two ends of the supporting table, and the two ends of the gas spring are respectively connected with the frame and the energy storage block. The technical effect of this scheme is: is convenient for improving the energy storage strength.
Further, the end face of the free end of the output shaft is provided with a graphite powder layer. The technical effect of this scheme is: the friction force between the end face of the free end of the output shaft and the clamping block is reduced.
Further, a sealing ring is sleeved on the energy storage plug. The technical effect of this scheme is: the sealing performance of the energy storage barrel is improved.
Further, a baffle is fixed on the frame and positioned on one side of the pulley, and the magnet can prop against the baffle. The technical effect of this scheme is: the magnet is convenient to limit.
Drawings
FIG. 1 is a schematic diagram of an energy storage mechanism according to an embodiment of the present invention;
FIG. 2 is a front cross-sectional view of an embodiment of the present invention before the cartridge is separated from the output shaft;
FIG. 3 is a front cross-sectional view of the embodiment of the invention with the cartridge separated from the output shaft;
fig. 4 is a partial enlarged view at a in fig. 2.
Detailed Description
The following is a further detailed description of the embodiments:
reference numerals in the drawings of the specification include: the device comprises a supporting table 1, an energy storage barrel 2, an energy storage plug 3, a pulley 4, a traction piece 5, a supporting rod 6, a sleeve 7, an output shaft 8, a magnet 9, an elastic piece 10, a clamping groove 11, a concave cavity 12, a clamping block 13, a baffle 14, a pressing block 15, a sample piece 16, a moving table 17, an objective table 18 and an energy storage block 19.
Embodiment one:
example one substantially as shown in figures 1 to 4: the vacuum energy storage mechanism of the material friction abnormal sound test bed shown in fig. 1 comprises a frame, a supporting table 1, a moving table 17, an energy storage unit and an objective table 18.
The number of the energy storage units is two, the two energy storage units are respectively positioned at the left end and the right end of the supporting table 1, each energy storage unit comprises an energy storage barrel 2, an energy storage plug 3, a pulley 4, a traction piece 5 and an energy storage block 19, the energy storage barrel 2 is fixedly arranged on the frame through bolts, and the energy storage plug 3 is arranged in the energy storage barrel 2 in a sliding manner; the pulley 4 is rotatably arranged on the frame, and the pulley 4 is I-shaped as seen from the top view direction of fig. 2 and 3; the cross-section of traction element 5 is square, and the lower extreme of traction element 5 passes through the screw connection with energy storage stopper 3, and motion platform 17 slides and sets up on supporting bench 1, and energy storage piece 19 is located between motion platform 17 and objective table 18, and energy storage piece 19 places on motion platform 17 promptly, and objective table 18 places on energy storage piece 19, and the other end of traction element 5 passes through the screw connection with energy storage piece 19 after bypassing pulley 4, and traction element 5 can select wire rope.
A pressing block 15 is vertically and fixedly arranged on the frame through bolts, one sample 16 is adhered to the pressing block 15, and the other sample 16 is adhered to the objective table 18.
Embodiment two:
on the basis of the first embodiment, as shown in fig. 2 and 4, the device further comprises a slow pushing unit, wherein the slow pushing unit comprises a supporting rod 6, a sleeve 7, an output shaft 8, a magnet 9 and an elastic piece 10, the top view of the supporting rod 6 is in a shape like a Chinese character 'ji', the right end of the sleeve 7 is closed, the right end of the sleeve 7 is connected with a moving table 17 through the supporting rod 6, namely, the right end of the supporting rod 6 is welded with the moving table 17, and the left end of the supporting rod 6 is welded with the right end of the sleeve 7; the output shaft 8 of the power mechanism, such as a cylinder, is arranged in the sleeve 7 in a sliding way, and a clamping groove 11 is formed on the output shaft 8.
The inner side wall of the sleeve 7 is provided with a concave cavity 12, a clamping block 13 in a shape of is arranged in the concave cavity 12 in a sliding manner, the clamping block 13 is connected with the bottom of the concave cavity 12 through an elastic piece 10, namely the lower end of the elastic piece 10 is welded with the bottom of the concave cavity 12, and the upper end of the elastic piece 10 is welded with the clamping block 13; wherein the elastic member 10 may be a leaf spring or a spring.
As shown in fig. 2, the magnet 9 is welded or bonded to the left side surface of the traction member 5; as shown in fig. 3, when the magnet 9 is located below the latch 13 and is close to the latch 13, the latch 13 can be attracted to slide downward and separate from the output shaft 8.
In contrast to the exemplary embodiment, in this exemplary embodiment the energy storage block 19 is fixedly connected to the motion stage 17, for example by means of adhesive bonding, welding or by means of screws.
The specific implementation process is as follows:
when friction between the sample pieces 16 is tested, the output shaft 8 contacts with the clamping block 13 shown in fig. 2 and 4 in the rightward extension process and pushes the sleeve 7, the support rod 6, the moving table 17, the energy storage block 19 and the objective table 18 to move through the clamping block 13, so that the sample pieces 16 on the objective table 18 and the sample pieces 16 on the pressing block 15 are uniformly rubbed, and abnormal sound displacement is accurately calculated.
The motion platform 17 drives the energy storage block 19 to move in the rightward moving process, so that the traction piece 5 drives the left energy storage plug 3 to slide upwards relative to the energy storage barrel 2, the energy storage barrel 2 is in a negative pressure state, and the traction piece 5 drives the magnet 9 to move upwards in the moving process.
As shown in fig. 3, when the sleeve 7 moves above the magnet 9 and the output shaft 8 is about to extend to the limit state, the clamping block 13 moves downward under the adsorption action of the magnet 9 and is separated from the output shaft 8, but of course, the clamping block 13 can be manually held by the magnet 9 to adsorb, the output shaft 8 does not act on the sleeve 7 any more, the output shaft 8 is decelerated and extends rightward in the sleeve 7 until extending to the limit state, and then is contracted reversely leftward and gradually increases the speed until contracting at a uniform speed.
In the process that the output shaft 8 stretches rightward in the sleeve 7 in a decelerating way, the output shaft 8 is separated from the clamping block 13, so that the output shaft 8 does not act on the moving table 17 any more, the fact that the output shaft 8 is transmitted to the moving table 17 in a stopping way in the reversing process is guaranteed, smooth movement of the moving table 17 is beneficial to accurately measuring friction force between the sample pieces 16, judgment of friction performance of the sample pieces 16 is facilitated, and accurate calculation of abnormal sound displacement is facilitated.
In the process that the output shaft 8 is contracted leftwards after being decelerated and stretched rightwards in the sleeve 7, under the action of negative pressure in the left energy storage barrel 2, the energy storage plug 3 and the traction piece 5 drive the energy storage block 19 and the moving table 17 to move leftwards and reversely to the position shown in fig. 3, in the process, the magnet 9 moves downwards under the action of the traction piece 5 and does not adsorb the clamping block 13 any more, and the clamping block 13 moves upwards and resets under the action of the elastic piece 10; when the output shaft 8 contacts the clamping block 13 again, the output shaft 8 and the clamping block 13 are in a moving state, and after the output shaft 8 contacts, the clamping block 13 drives the sleeve 7, the support rod 6, the moving table 17, the energy storage block 19 and the objective table 18 to move left and reverse smoothly, so that friction between the sample pieces 16 is tested.
Because the output shaft 8 and the clamping block 13 are in the same-direction movement and even move at the same speed when being contacted, compared with the contact of the moving output shaft 8 and the static clamping block 13, the contact impact force of the moving output shaft 8 and the moving clamping block 13 is smaller, the impact force transmitted to the moving table 17 can be well reduced, and the smooth movement of the moving table 17 is beneficial to accurately measuring the friction force between the sample pieces 16.
When the output shaft 8 contracts leftwards, negative pressure is formed in the right energy storage barrel 2, and when the output shaft 8 contracts leftwards to a limit state and then stretches rightwards, the right end of the output shaft 8 slides in the clamping groove 11, in the process, the output shaft 8 does not act on the clamping block 13, and the clamping block 13, the sleeve 7, the support rod 6 and the moving table 17 move rightwards under the action of the negative pressure in the right energy storage barrel 2; after the output shaft 8 moving rightward is contacted with the clamping block 13 moving rightward, the moving table 17 is driven to move rightward smoothly, and friction between the sample pieces 16 is tested.
By proposing the invention conception of reverse movement relay, the scheme ensures that the friction state between the sample pieces 16 cannot be changed drastically, thereby being beneficial to improving the judgment of the friction performance of the sample pieces 16.
Embodiment III:
on the basis of the second embodiment, the device also comprises four gas springs (not shown in the figure), wherein two gas springs are respectively arranged at the left end and the right end of the supporting table 1, one end of each gas spring is hinged with the rack through a pin roll, and the other end of each gas spring is hinged with the energy storage block 19 through a pin roll; of the two gas springs at the left end of the support table 1, one end of the two gas springs close to the support table 1 is close to the other end, and the two gas springs are in an eight shape when seen from the overlooking directions of fig. 2 and 3.
As shown in fig. 2 and 3, a baffle 14 is fixed on the frame through bolts, the baffle 14 is located at the left side of the pulley 4, the magnet 9 can prop against the baffle 14, the baffle 14 is made of plastic, and a sealing ring (not shown in the figure) is sleeved on the energy storage plug 3. As shown in fig. 4, the end face of the right end of the output shaft 8 is coated with a graphite powder layer.
The foregoing is merely exemplary embodiments of the present invention, and specific structures and features that are well known in the art are not described in detail herein. It should be noted that modifications and improvements can be made by those skilled in the art without departing from the structure of the present invention, and these should also be considered as the scope of the present invention, which does not affect the effect of the implementation of the present invention and the utility of the patent.
Claims (9)
1. The material friction abnormal sound test bench vacuum energy storage mechanism, its characterized in that: the device comprises a supporting table, a moving table, an energy storage unit and an objective table, wherein the moving table is arranged on the supporting table in a sliding manner, the energy storage unit comprises an energy storage barrel, an energy storage plug, a traction piece and an energy storage block, the energy storage plug is arranged in the energy storage barrel in a sliding manner, the energy storage plug is connected with the energy storage block through the traction piece, and the energy storage block is positioned between the moving table and the objective table;
the device comprises a sleeve, a motion platform, a support rod, an output shaft, a magnet and an elastic piece, wherein the support rod is in a shape like a Chinese character 'ji', one end of the sleeve is closed, the end of the sleeve is connected with the motion platform through the support rod, the output shaft is arranged in the sleeve in a sliding manner, and a clamping groove is formed in the output shaft; the inner side wall of the sleeve is provided with a concave cavity, a clamping block in a shape is arranged in the concave cavity in a sliding manner, and the clamping block is connected with the bottom of the concave cavity through an elastic piece; the magnet is connected with the traction piece, and the magnet can drive the clamping block to slide and separate the clamping block from the output shaft;
when friction between the sample pieces is tested, the output shaft is contacted with the clamping block in the extending process and pushes the sleeve, the supporting rod, the moving table, the energy storage block and the objective table to move through the clamping block, so that the sample pieces on the objective table and the sample pieces on the pressing block are uniformly rubbed;
the energy storage block is driven to move in the moving process of the moving table, so that the energy storage plug is driven to slide relative to the energy storage barrel through the traction piece, the negative pressure state is displayed in the energy storage barrel, and the magnet is driven to move in the moving process of the traction piece;
when the sleeve moves to the upper part of the magnet and the output shaft is about to extend to the limit state, the clamping block is separated from the output shaft under the adsorption action of the magnet, the output shaft does not act on the sleeve any more, the output shaft is in the sleeve to be in deceleration extension until the sleeve is extended to the limit state, and then the output shaft is in reverse acceleration contraction and gradually increases the speed to uniform speed contraction;
in the process that the output shaft is reversely contracted after the deceleration and the extension in the sleeve, the energy storage block and the moving table reversely move under the action of negative pressure in the energy storage barrel, the magnet on the traction piece reversely moves under the action of the energy storage plug, the magnet does not adsorb the clamping block any more, and the clamping block is reset under the action of the elastic piece; when the output shaft contacts the clamping block again, the output shaft and the clamping block are in a moving state, and after the output shaft contacts, the output shaft can drive the sleeve, the support rod, the moving table, the energy storage block and the objective table to move reversely through the clamping block, so that friction between sample pieces is tested.
2. The material friction abnormal sound test stand vacuum energy storage mechanism according to claim 1, wherein: the energy storage unit also comprises a pulley, one end of the traction piece is connected with the energy storage plug, and the other end of the traction piece bypasses the pulley and is connected with the energy storage block.
3. The material friction abnormal sound test stand vacuum energy storage mechanism according to claim 2, wherein: the cross section of the traction piece is square.
4. The material friction abnormal sound test stand vacuum energy storage mechanism according to claim 3, wherein: the pulley is I-shaped.
5. The material friction abnormal sound test stand vacuum energy storage mechanism according to claim 4, wherein: the number of the energy storage units is two, and the two energy storage units are respectively positioned at two ends of the supporting table.
6. The material friction abnormal sound test stand vacuum energy storage mechanism according to claim 5, wherein: the device also comprises a frame and a gas spring, wherein the frame is positioned at two ends of the supporting table, and the two ends of the gas spring are respectively connected with the frame and the energy storage block.
7. The material friction abnormal sound test stand vacuum energy storage mechanism of claim 6, wherein: the end face of the free end of the output shaft is provided with a graphite powder layer.
8. The material friction abnormal sound test stand vacuum energy storage mechanism of claim 7, wherein: the energy storage plug is sleeved with a sealing ring.
9. The material friction abnormal sound test stand vacuum energy storage mechanism of claim 8, wherein: a baffle is fixed on the frame and positioned on one side of the pulley, and the magnet can prop against the baffle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110054265.XA CN112730218B (en) | 2021-01-15 | 2021-01-15 | Vacuum energy storage mechanism of material friction abnormal sound test bed |
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| CN202110054265.XA CN112730218B (en) | 2021-01-15 | 2021-01-15 | Vacuum energy storage mechanism of material friction abnormal sound test bed |
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| CN112730218B true CN112730218B (en) | 2024-03-19 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1399174A (en) * | 1972-01-21 | 1975-06-25 | H W M Hemann Weh Maschinenfabr | Apparatus for delivering and stacking flat material |
| CN101832303A (en) * | 2010-05-12 | 2010-09-15 | 河北华北石油荣盛机械制造有限公司 | Piston-type deep sea water pressure compensation energy accumulator |
| CN209963908U (en) * | 2019-06-20 | 2020-01-17 | 中国汽车工程研究院股份有限公司 | Connecting structure of material sticking head and execution motor in automobile material stick-slip motion testing equipment |
| CN209961494U (en) * | 2019-07-19 | 2020-01-17 | 中国汽车工程研究院股份有限公司 | Abnormal sound friction test platform motion platform device |
| CN111766198A (en) * | 2020-07-09 | 2020-10-13 | 重庆大学 | Material dynamic friction force test method and device based on folding pendulum |
-
2021
- 2021-01-15 CN CN202110054265.XA patent/CN112730218B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1399174A (en) * | 1972-01-21 | 1975-06-25 | H W M Hemann Weh Maschinenfabr | Apparatus for delivering and stacking flat material |
| CN101832303A (en) * | 2010-05-12 | 2010-09-15 | 河北华北石油荣盛机械制造有限公司 | Piston-type deep sea water pressure compensation energy accumulator |
| CN209963908U (en) * | 2019-06-20 | 2020-01-17 | 中国汽车工程研究院股份有限公司 | Connecting structure of material sticking head and execution motor in automobile material stick-slip motion testing equipment |
| CN209961494U (en) * | 2019-07-19 | 2020-01-17 | 中国汽车工程研究院股份有限公司 | Abnormal sound friction test platform motion platform device |
| CN111766198A (en) * | 2020-07-09 | 2020-10-13 | 重庆大学 | Material dynamic friction force test method and device based on folding pendulum |
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