CN108088791A - Coefficient of sliding friction measuring device and measuring method between a kind of soil body and excavation equipment - Google Patents
Coefficient of sliding friction measuring device and measuring method between a kind of soil body and excavation equipment Download PDFInfo
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- CN108088791A CN108088791A CN201711144046.0A CN201711144046A CN108088791A CN 108088791 A CN108088791 A CN 108088791A CN 201711144046 A CN201711144046 A CN 201711144046A CN 108088791 A CN108088791 A CN 108088791A
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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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Abstract
The invention belongs to underground engineering construction fields, and in particular to coefficient of sliding friction measuring device and measuring method between a kind of soil body and excavation equipment, including testing stand, measurement mechanism and actuating unit；Testing stand includes test stand, dead axle and can lift feet；Measurement mechanism includes steel plate, casing, protractor dial, protractor pointer, spirit level, photoelectric door and lightweight annulus；When steel plate rotates, protractor pointer can realize the measurement to steel plate rotational angle with the cooperation of protractor dial；Spirit level is installed on steel plate；Photoelectric door is fixed on steel plate and positioned at the one side of protractor dial, and lightweight annulus is arranged on steel plate and is disposed adjacent with photoelectric door, while lightweight annulus can slide along steel plate and pass through photoelectric door.The continuity of measurement can be effectively ensured in it, and improves the accuracy of measurement result.
Description
Technical field
The invention belongs to underground engineering construction fields, and in particular to the coefficient of sliding friction is surveyed between a kind of soil body and excavation equipment
Measure device and measuring method.
Background technology
In the work progress of underground engineering, construction machinery utensil can generate rubbing action when interacting with the soil body, soil
Coefficient of friction between body and equipment etc. can have large effect to the type selecting and construction efficiency of construction machinery or material.Such as
Shield machine in the construction process, shield shell, cutterhead and soil output all can with the soil body generate friction, apply man-hour requirement obtain compared with
For the accurate soil body coefficient of sliding friction, to set construction parameter.Below with the soil body and earth pressure balanced shield, EPBS soil output
Between the coefficient of sliding friction measurement exemplified by, discuss the significance of soil body coefficient of sliding friction measurement.
Earth pressure balanced shield, EPBS is to adjust pressure by controlling the mass rate of emission of control dregs in driving speed and pressure chamber
The pressure in cabin, so as to balance the soil water pressure of excavation face.In shield machine tunneling process, controlled by the driving speed of shield machine
The excavated volume of the soil body before shield processed, while the rotating speed of spiral dumper is controlled to carry out the discharge capacity of control cabinet soil, when excavated volume and casting
When amount is consistent, shield machine could carry out phenomena such as normally construction is without backbreaking or owing to dig, and then influence stratum
Stability also ensures that the quality of construction.Therefore, through being cut into the soil body of pressure chamber in earth pressure shield tunneling machine work progress
It must is fulfilled for Plastic Flow state, i.e., relatively low permeability, good mobility, smaller coefficient of friction and torque.It is if discontented
These conditions of foot, cabin soil is usually present with molding, soil cabin occlusion and gushs etc. three kinds and causes earth pressure shield tunneling machine in the construction process
The accident that construction can not be normally carried out.
Soil improvement technology refers to add in additive in the dregs cut so as to improve the mechanical property of the soil body, makes
It reaches Plastic Flow state, and then the problems such as solve the molding that shield machine occurs in the construction process, soil cabin occlusion and gush.
Therefore, the soil body after digging dregs or improvement before not improveing either, is required for carrying out between the soil body and shield equipment etc.
Coefficient of friction.However, academic circles at present and the engineering circles unified generally acknowledged measurement for the soil body coefficient of sliding friction not yet
Apparatus and method, Most scholars are tested using simple slide plate come the angle of external friction of the soil body.
Utility model patent " a kind of soil body friction coefficient measuring apparatus " (application number 201620078879.6) is by hand
Rocking handle, draught line promote slide plate one end, can substantially measure the angle of external friction of sample to be tested, and the device is easily operated, but drive
Mode is manual drive, promotes speed stability and is difficult to ensure that experimental error is larger.
A kind of utility model patent " measuring device for simulating EPB shield tunneling soil output coefficient of friction " (application number
201220361657.7) using leading screw adjusting by the way of adjusting slider inclination angle, the increased stabilization of device vane obliquity
Property is relatively difficult to guarantee.
Utility model patent " a kind of friction coefficient measurement device " (application number 201020149263.6) is middle school physical experiment
Teaching aid, using fastening screw come the inclination angle of adjusting slider, the amplitude of accommodation is small, poor continuity, error are big, is not used to be tested
Research.
Above-mentioned known patent is driven using manpower, it is impossible to ensure the uniformly coherent of slide plate angular increment；In addition it is to be measured
Sample is not easy to be discovered by people when occurring small slip on slide plate, and more than reason all can bring error to measurement result.
The content of the invention
The present invention provides a kind of soil body and excavates coefficient of sliding friction measuring device and measuring method between equipment, can be effective
Ensure the continuity of measurement, and improve the accuracy of measurement result.
To realize above-mentioned technical purpose, the specific technical solution that the present invention takes is, sliding between a kind of soil body and excavation equipment
Dynamic friction coefficient measuring device, including testing stand, measurement mechanism and actuating unit；Testing stand includes test stand, dead axle and can rise
Feet drops；The bottom that feet is arranged on test stand can be lifted；Dead axle is arranged on the centre position at the top of test stand, and along test stand width
Direction is arranged；Measurement mechanism includes steel plate, casing, protractor dial, protractor pointer, spirit level, photoelectric door and lightweight circle
Ring；Casing is installed on dead axle and can be fixed under the drive of actuating unit around fixed-axis rotation, the centre position of the bottom of steel plate
In on casing, and it can rotate and rotate with casing；Protractor dial is fixed on the center of steel plate, and can turn with steel plate
It moves and rotates；Protractor pointer is fixed on dead axle, and protractor pointer is straight up；When steel plate rotates, protractor pointer
The measurement to steel plate rotational angle can be realized with the cooperation of protractor dial；Spirit level is installed on steel plate；Photoelectric door is fixed on
On steel plate and positioned at the one side of protractor dial, lightweight annulus is arranged on steel plate and is disposed adjacent with photoelectric door, while lightweight
Annulus can slide along steel plate and pass through photoelectric door.
As the improved technical solution of the present invention, actuating unit includes decelerator, single slot small belt pulley, single slot great Pi
Belt wheel and belt；Single slot big belt pulley is sequentially connected in casing, and single slot small belt pulley is sequentially connected in decelerating motor, and single slot is big
Belt pulley is connected with single slot small belt pulley using belt.
As the improved technical solution of the present invention, locking device is further included, locking device includes pedestal, pawl and spring,
Pedestal is arranged on test stand, and one end of spring is fixed on pedestal, and the other end is fixedly connected with pawl；It is matchingly set on casing
There is the ratchet being meshed with pawl, pawl can be stuck on ratchet, and spring is in tensional state；When decelerator stops turning
When dynamic, ratchet realizes the locking to casing with click-fit.
As the improved technical solution of the present invention, the edge of steel plate is equipped with enclosing.
As the improved technical solution of the present invention, photoelectric door is connected with decelerator conducting wire.
As the improved technical solution of the present invention, lightweight annulus is light plastic annulus.
Another object of the present invention is to provide a kind of soil body and excavate the survey of coefficient of sliding friction measuring device between equipment
Amount method, includes the following steps：
Step 1: opening decelerator, under the drive of actuating unit steel plate is promoted tentatively to reach horizontal level；It adjusts again
Energy-saving elevated feet makes the bubble in spirit level placed in the middle；
Step 2: filling dregs into lightweight annulus, and dregs is flattened, ensure the one side light that dregs is contacted with steel plate
It is sliding；Lightweight annulus equipped with dregs is put on steel plate, and ensures that it is adjacent with photoelectric door；
Step 3: starting decelerator, decelerator drives steel plate one-directional rotation, until position occurs for lightweight annulus
It moves, photoelectric door senses the variation of signal, while decelerating motor stops operating, and locking device realizes the locking to casing；
Step 4: reading the number of degrees of the protractor pointer on protractor dial, which rubs for dregs and the outer of steel plate
Angle is wiped, and the coefficient of sliding friction is calculated according to the angle of external friction.
As the improved technical solution of the present invention, the angle that decelerator drives steel plate to rotate is 0.1 °/s-0.5 °/s.
As the improved technical solution of the present invention, step 1, which is additionally included between casing and dead axle, inserts lubricating oil or axis
It holds.
Advantageous effect
Apparatus of the present invention and method, for measuring the angle of external friction of the improvement soil body, with this calculate after soil improvement with spiral
Go out the coefficient of friction of earthenware, result is accurate；
The apparatus structure is exquisite, it is affected by environment it is small, result is reliable and stable, easy to operate, highly practical, can be relatively accurate
The angle of external friction between soil output and then the coefficient of sliding friction is obtained after ground measurement soil improvement, can be laboratory test personnel
Or field technician provides reliable experimental result.
In addition, the application measuring device is driven using decelerating motor, the uniformly coherent of steel plate angular increment can guarantee；Simultaneously
Using the photoelectric door being connected with decelerating motor, when sample appearance small slip, motor will power off, these all ensure that
The accuracy of measurement result.
To sum up, compared with measuring device of the prior art, the application apparatus structure is simple, precision higher.
Description of the drawings
The structure diagram of Fig. 1 the application measuring devices；
The structure diagram of actuating unit in Fig. 2 the application measuring devices；
The overlooking the structure diagram of Fig. 3 the application measuring devices；
In figure, 10, testing stand；11st, test stand；12nd, dead axle；13rd, feet can be lifted；
20th, measurement mechanism；21st, steel plate；22nd, casing；23rd, protractor dial；24th, protractor pointer；25th, spirit level；
26th, photoelectric door；27th, light plastic annulus；
30th, transmission mechanism；31st, decelerator；32nd, single slot small belt pulley；33rd, single slot big belt pulley；34th, belt；
351st, ratchet；352nd, pawl；353rd, spring.
Specific embodiment
To make the purpose of the embodiment of the present application and technical solution clearer, below in conjunction with the embodiment of the present application to this Shen
Technical solution please is clearly and completely described.Obviously, described embodiment is the part of the embodiment of the application, and
The embodiment being not all of.Based on described embodiments herein, those of ordinary skill in the art are without creative labor
All other embodiments obtained on the premise of dynamic, shall fall in the protection scope of this application.
Those skilled in the art of the present technique are appreciated that unless otherwise defined all terms used herein are (including technology art
Language and scientific terminology) there is the meaning identical with the general understanding of the those of ordinary skill in the application fields.Should also
Understand, those terms such as defined in the general dictionary, which should be understood that, to be had and the meaning in the context of the prior art
The consistent meaning of justice, and unless defined as here, will not be with idealizing or the meaning of overly formal be explained.
The meaning of " connection " described herein can be between component to be directly connected to can also pass through between component
Other components are indirectly connected with.
In embodiment, testing stand 10, test stand 11, can lift feet 13, measurement mechanism 20, steel plate 21, casing at dead axle 12
22nd, protractor dial 23, protractor pointer 24, spirit level 25, photoelectric door 26, light plastic annulus 27, transmission mechanism 30, subtract
Electric motor with speed 31, single slot small belt pulley 32, single slot big belt pulley 33, belt 34, ratchet 351, pawl 352, spring 353.
As shown in Figs. 1-3, coefficient of sliding friction measuring device between a kind of soil body and excavation equipment, including testing stand, measures
Mechanism and actuating unit；
Testing stand includes test stand, dead axle and can lift feet；The bottom that feet is arranged on test stand can be lifted；Dead axle is arranged on
Centre position at the top of test stand, and arranged along test stand width；
Measurement mechanism includes steel plate, casing, protractor dial, protractor pointer, spirit level, photoelectric door and lightweight circle
Ring；Casing is installed on dead axle and can be fixed under the drive of actuating unit around fixed-axis rotation, the centre position of the bottom of steel plate
In on casing (in order to ensure the holding of steel plate energy prestissimo balance, it is preferred that steel plate is fixed in the central axes of length direction
In on casing), and can rotate and rotate with casing；Protractor dial is fixed on center (the protractor dial of steel plate
Length direction parallel to steel plate length direction), and can be rotated with the rotation of steel plate；Protractor pointer is fixed on dead axle
On, and protractor pointer is straight up；When steel plate rotates, protractor pointer can be realized to steel plate with the cooperation of protractor dial
The measurement of rotational angle；Spirit level is installed on steel plate；Photoelectric door is fixed on steel plate and is located at the one side of protractor dial,
Lightweight annulus is arranged on steel plate and is disposed adjacent with photoelectric door, at the same lightweight annulus can be slided along steel plate and pass through photoelectric door (for
Facilitating lightweight annulus, length, width and the height of photoelectric door are all higher than the diameter and height of lightweight annulus through photoelectric door
Degree).
As the improved technical solution of the present invention, actuating unit includes decelerator, single slot small belt pulley, single slot great Pi
Belt wheel and belt；Single slot big belt pulley is sequentially connected in casing, and single slot small belt pulley is sequentially connected in decelerating motor, and single slot is big
Belt pulley is connected with single slot small belt pulley using belt；Pass through single slot small belt pulley, single slot big belt when decelerator rotates
Wheel and belt, which are realized, drives casing to rotate；
Actuating unit also can use the coaxially connected casing of decelerator to realize in the present embodiment, but its stability is not upper
State actuating unit stabilization.
In the present embodiment, the high 1m of test stand, long 1.1m, wide 0.4m, material are wood.Steel plate long 1m, wide 0.3m, enclosing
High 0.05m, material are stainless steel plate；Photoelectric door width is 0.25m, is highly 0.15m；Light plastic circle diameter is 0.2m,
High 0.1m, bottom are smooth；Protractor scale precision is 1 °；It is total in decelerator, single slot small belt pulley, single slot big belt pulley
The rotational angular velocity of same-action lower steel plate is 0.1 °/s~0.5 °/s.
When stopping operating to improve decelerator, the stability of steel plate further includes locking device, and locking device includes
Pedestal, pawl and spring, pedestal are arranged on test stand, and one end of spring is fixed on pedestal, and the other end is fixedly connected with pawl；
The ratchet being meshed with pawl is matchingly provided on casing, pawl can be stuck on ratchet, and spring is in tensional state；When
When decelerator stops operating, ratchet realizes the locking to casing with click-fit.
Preferably, lightweight annulus is light plastic annulus in the present embodiment, and light plastic annulus is slipped to steel in order to prevent
Outside plate, the edge of steel plate is equipped with enclosing, and the preferably both ends in steel plate length direction are equipped with baffle.
In order to improve the precision of measurement, photoelectric door is connected with decelerator conducting wire, when photoelectric door detects signal,
Deceleration electric function timely responds to, and is stopped.
Another object of the present invention is to provide a kind of soil body and excavate the survey of coefficient of sliding friction measuring device between equipment
Amount method, includes the following steps：
Step 1: opening decelerator, under the drive of actuating unit steel plate is promoted tentatively to reach horizontal level；It adjusts again
Energy-saving elevated feet makes the bubble in spirit level placed in the middle；
Step 2: filling dregs into lightweight annulus, and dregs is flattened, ensure the one side light that dregs is contacted with steel plate
It is sliding；Lightweight annulus equipped with dregs is put on steel plate, and ensures that it is adjacent with photoelectric door；
Step 3: starting decelerator, decelerator drives steel plate one-directional rotation, until position occurs for lightweight annulus
It moves, photoelectric door senses the variation of signal, while decelerating motor stops operating, and locking device realizes the locking to casing；
Step 4: reading the number of degrees of the protractor pointer on protractor dial, which rubs for dregs and the outer of steel plate
Angle is wiped, and the coefficient of sliding friction is calculated according to the angle of external friction.
As the improved technical solution of the present invention, the angle that decelerator drives steel plate to rotate is 0.1 °/s-0.5 °/s.
As the improved technical solution of the present invention, step 1, which is additionally included between casing and dead axle, inserts lubricating oil or axis
It holds.
Specifically, in use, steel plate first is adjusted to substantially horizontal arrangement, then adjust the feet that can lift of bottom and make spirit level
Interior bubble is placed in the middle, and (improvement) dregs is then filled in light plastic annulus, is placed on steel plate, against photoelectric door, starting
Power supply, decelerator rotate and drive steel plate that it is made slowly to one-directionally rotate, until light plastic annulus has small slip, at this time
Photoelectric door senses the variation of signal, and decelerator is powered off and stopped operating immediately, and locking device is in the lock state immediately.
Read the number of degrees of protractor pointer at this time in protractor dial, when reading should ensure that sight and protractor pointer and dial
Vertically, estimate and read a decimal, number of degrees θ is the angle of external friction for improveing dregs and steel plate 21.Cunning between dregs and EPB shield tunneling
The coefficient of kinetic friction is calculated by μ=tan θ, and every group of experiment makees 3~5 samples of the same race and average.
Above-mentioned measuring device is not limited merely to the coefficient of sliding friction between the measurement soil body and EPB shield tunneling equipment, above-mentioned tool
Body embodiment is also only the preferred embodiment of the present invention, and it is not intended to limit the protection scope of the present invention, as long as using the present invention
Design principle and the variation for carrying out non-creative work on this basis and making, are within the scope of protection of the invention.
Claims (9)
1. coefficient of sliding friction measuring device between a kind of soil body and excavation equipment, which is characterized in that including testing stand, measurement mechanism
And actuating unit；Testing stand includes test stand, dead axle and can lift feet；The bottom that feet is arranged on test stand can be lifted；Dead axle
Centre position at the top of test stand, and arranged along test stand width；Measurement mechanism includes steel plate, casing, protractor
Dial, protractor pointer, spirit level, photoelectric door and lightweight annulus；Casing is installed on dead axle and can be in the band of actuating unit
It is fixed under dynamic around fixed-axis rotation, the centre position of the bottom of steel plate on casing, and can rotate and rotate with casing；Protractor is carved
Scale is fixed on the center of steel plate, and can be rotated with the rotation of steel plate；Protractor pointer is fixed on dead axle, and is measured
Angle device pointer is straight up；When steel plate rotates, protractor pointer can be realized with the cooperation of protractor dial to steel plate rotational angle
Measurement；Spirit level is installed on steel plate；Photoelectric door is fixed on steel plate and positioned at the one side of protractor dial, lightweight annulus
It is disposed adjacent on steel plate and with photoelectric door, while lightweight annulus can slide along steel plate and pass through photoelectric door.
2. coefficient of sliding friction measuring device between a kind of soil body according to claim 1 and excavation equipment, which is characterized in that
Actuating unit includes decelerator, single slot small belt pulley, single slot big belt pulley and belt；Single slot big belt pulley is sequentially connected
In casing, single slot small belt pulley is sequentially connected in decelerating motor, and single slot big belt pulley is connected with single slot small belt pulley using belt.
3. coefficient of sliding friction measuring device between a kind of soil body according to claim 2 and excavation equipment, which is characterized in that
Locking device is further included, locking device includes pedestal, pawl and spring, and pedestal is arranged on test stand, and one end of spring is fixed on
On pedestal, the other end is fixedly connected with pawl；The ratchet being meshed with pawl is matchingly provided on casing, pawl can be stuck in spine
On wheel, and spring is in tensional state；When decelerator stops operating, ratchet realizes the lock to casing with click-fit
It is fixed.
4. coefficient of sliding friction measuring device between a kind of soil body according to claim 1 and excavation equipment, which is characterized in that
The edge of steel plate is equipped with enclosing.
5. coefficient of sliding friction measuring device between a kind of soil body according to claim 2 and excavation equipment, which is characterized in that
Photoelectric door is connected with decelerator conducting wire.
6. coefficient of sliding friction measuring device between a kind of soil body according to claim 1 and excavation equipment, which is characterized in that
Lightweight annulus is light plastic annulus.
7. a kind of measurement side of coefficient of sliding friction measuring device between soil body and excavation equipment as described in claim 1-6 is arbitrary
Method, which is characterized in that include the following steps：
Step 1: opening decelerator, under the drive of actuating unit steel plate is promoted tentatively to reach horizontal level；Energy is adjusted again
Lifting feet makes the bubble in spirit level placed in the middle；
Step 2: filling dregs into lightweight annulus, and dregs is flattened, ensure the one-sided smooth that dregs is contacted with steel plate；It will
Lightweight annulus equipped with dregs is put on steel plate, and ensures that it is adjacent with photoelectric door；
Step 3: starting decelerator, decelerator drives steel plate one-directional rotation, until lightweight annulus is subjected to displacement, light
Electric switch senses the variation of signal, while decelerating motor stops operating, and locking device realizes the locking to casing；
Step 4: reading the number of degrees of the protractor pointer on protractor dial, which is the angle of external friction of dregs and steel plate,
And the coefficient of sliding friction is calculated according to the angle of external friction.
8. a kind of soil body according to claim 7 and the measuring method for excavating coefficient of sliding friction measuring device between equipment,
It is characterized in that, the angle that decelerator drives steel plate to rotate is 0.1 °/s-0.5 °/s.
9. a kind of soil body according to claim 7 and the measuring method for excavating coefficient of sliding friction measuring device between equipment,
It is characterized in that, step 1, which is additionally included between casing and dead axle, inserts lubricating oil or bearing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711144046.0A CN108088791A (en) | 2017-11-17 | 2017-11-17 | Coefficient of sliding friction measuring device and measuring method between a kind of soil body and excavation equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711144046.0A CN108088791A (en) | 2017-11-17 | 2017-11-17 | Coefficient of sliding friction measuring device and measuring method between a kind of soil body and excavation equipment |
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| Publication Number | Publication Date |
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| CN108088791A true CN108088791A (en) | 2018-05-29 |
Family
ID=62172753
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711144046.0A Pending CN108088791A (en) | 2017-11-17 | 2017-11-17 | Coefficient of sliding friction measuring device and measuring method between a kind of soil body and excavation equipment |
Country Status (1)
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| CN (1) | CN108088791A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110243585A (en) * | 2019-07-09 | 2019-09-17 | 九牧厨卫股份有限公司 | A kind of the smoothness test device and its method of sliding door |
| WO2023202088A1 (en) * | 2022-04-15 | 2023-10-26 | 盾构及掘进技术国家重点实验室 | Mud cake formation prevention steel plate for shield cutter head, and simulation test table and test method for characteristic testing thereof |
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| SU794438A1 (en) * | 1976-12-13 | 1981-01-07 | Dadashev Nazim G | Instrument for determining friction coefficient of filtration crust |
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| CN202814856U (en) * | 2012-07-25 | 2013-03-20 | 北京市轨道交通建设管理有限公司 | Experimental equipment for simulating friction coefficient of spiral unearthing device of earth pressure balance shield |
| CN103307959A (en) * | 2013-05-17 | 2013-09-18 | 中国科学院武汉岩土力学研究所 | Tilting testing device for measuring anisotropy of sliding friction angle of rock joint surface |
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| CN205483968U (en) * | 2016-01-27 | 2016-08-17 | 陕西铁路工程职业技术学院 | Soil body coefficient of friction measuring device |
| CN106179596A (en) * | 2016-08-20 | 2016-12-07 | 王杭花 | A kind of livestock breed aquatics efficient feed rate breaker |
| CN207379899U (en) * | 2017-11-17 | 2018-05-18 | 河海大学 | A kind of soil body coefficient of sliding friction measuring device |
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|---|---|---|---|---|
| SU794438A1 (en) * | 1976-12-13 | 1981-01-07 | Dadashev Nazim G | Instrument for determining friction coefficient of filtration crust |
| CN201667152U (en) * | 2010-04-02 | 2010-12-08 | 董华江 | Friction coefficient measuring device |
| CN202814856U (en) * | 2012-07-25 | 2013-03-20 | 北京市轨道交通建设管理有限公司 | Experimental equipment for simulating friction coefficient of spiral unearthing device of earth pressure balance shield |
| CN103307959A (en) * | 2013-05-17 | 2013-09-18 | 中国科学院武汉岩土力学研究所 | Tilting testing device for measuring anisotropy of sliding friction angle of rock joint surface |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110243585A (en) * | 2019-07-09 | 2019-09-17 | 九牧厨卫股份有限公司 | A kind of the smoothness test device and its method of sliding door |
| WO2023202088A1 (en) * | 2022-04-15 | 2023-10-26 | 盾构及掘进技术国家重点实验室 | Mud cake formation prevention steel plate for shield cutter head, and simulation test table and test method for characteristic testing thereof |
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Application publication date: 20180529 |