CN106990037A - A kind of one side slides Multifunctional friction Material Testing Machine - Google Patents
A kind of one side slides Multifunctional friction Material Testing Machine Download PDFInfo
- Publication number
- CN106990037A CN106990037A CN201710287950.0A CN201710287950A CN106990037A CN 106990037 A CN106990037 A CN 106990037A CN 201710287950 A CN201710287950 A CN 201710287950A CN 106990037 A CN106990037 A CN 106990037A
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- friction material
- testing machine
- sliding stand
- slides
- material testing
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Classifications
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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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
- G01N3/36—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces generated by pneumatic or hydraulic means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- General Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
Multifunctional friction Material Testing Machine is slided the invention discloses a kind of one side, including frame (1), hydraulic system, slide assemblies and humidity control system, wherein, the hydraulic system includes vertical oil cylinder (2), cross cylinder (3), ring flange (6), vertical pressure sensor (7), vertical displacement sensor, connecting rod (18), horizontal pressure force sensor (19), horizontal displacement sensors and servo valve block；The slide assemblies are arranged on the upper surface of the frame (1) bedplate, including bearing base (16), guiding mechanism, sliding stand component, slide plate and sample frock (8)；The humidity control system includes temperature thermocouple, the temperature for monitoring the slide plate in real time, and then realizes the temperature control to friction material.The testing machine of the present invention, can be achieved frictional behaviour experiment of the friction material under the working conditions such as different face pressures, speed and temperature.
Description
Technical field
The invention belongs to friction material test machine field, Multifunctional friction material is slided more particularly, to a kind of one side
Testing machine.
Background technology
The frictional behaviour of friction material is directly connected to the overall performance of earthquake isolating equipment, and it mainly passes through detected materials and cunning
Plate carries out initial confficient of static friction, mean coefficient of kinetic sliding friction and the rate of wear of reciprocating sliding friction to obtain test material etc. and rubbed
Wipe performance parameter.
At present, existing sliding frictional wear testing equipment mostly use disk rotary friction mode, such as ball-disc type,
Pin-disc type and ring-block formula friction test device.Such experimental rig mainly passes through the frictional disk and fixed friction head of rotation
Slip is rotated, so as to measure the coefficient of friction of frictional disk, this has very big difference with earthquake isolating equipment reciprocating sliding friction mode,
Surveyed frictional behaviour parameter can not be scientifically and rationally as the design considerations of earthquake isolating equipment；Secondly, such experimental rig is vertical
Load capability is small, and depth of parallelism stability is poor when frictional disk is rotated, and lacks corresponding temperature-adjusting device, it is impossible to meet friction material
Carry out the frictional behaviour test requirements document under the earthquake working condition such as different face pressures, speed and temperature.
The content of the invention
For the disadvantages described above or Improvement requirement of prior art, the present invention provides a kind of one side and slides Multifunctional friction material
Testing machine, adjusts the surface pressure that friction material is born by vertical oil cylinder, the reciprocal of friction material is realized by cross cylinder
Sliding friction, the test temperature of friction material is adjusted by humidity control system, and friction material can be achieved in different face pressures, speed
And the frictional behaviour experiment under the working condition such as temperature.
To achieve the above object, the present invention provides a kind of one side and slides Multifunctional friction Material Testing Machine, including frame, liquid
Pressure system, slide assemblies and humidity control system, wherein,
The hydraulic system includes vertical oil cylinder, cross cylinder, vertical displacement sensor, horizontal displacement sensors, flange
Disk, vertical pressure sensor, connecting rod, horizontal pressure force sensor and servo valve block, the vertical oil cylinder are arranged on the frame
Top plate on, the vertical oil cylinder is internally provided with the vertical displacement sensor, and the pistons end of the vertical oil cylinder leads to
Cross the ring flange to be connected with the vertical pressure sensor, the cross cylinder is arranged on the crossbeam of the frame, described
The end of cross cylinder fixed by support frame and the base of the frame, and the cross cylinder is internally provided with the level
Displacement transducer, the cross cylinder pistons end is connected with one end of the horizontal pressure force sensor, and the horizontal pressure force is passed
The other end of sensor is fixed by screw thread with the connecting rod, and the servo valve block connects pumping plant by hydraulic oil pipe and erected to be described
Power is provided to oil cylinder and cross cylinder；
The slide assemblies are arranged on the upper surface of the frame ground seat board, including bearing base, guiding mechanism, slip
Platform component, slide plate and sample frock, the lower surface of the bearing base are connected by screw with the bedplate of the frame, described
Guiding mechanism is arranged on the upper surface of the bearing base, and the sample frock upper surface passes through screw thread and the vertical pressure
The lower surface connection of sensor, the sample frock lower surface is provided with groove, and friction material sample is embedded in the sample frock
In groove, and with the upper surface of the slide plate, the slide plate located at the sliding stand component upper surface on；
The humidity control system includes temperature thermocouple, the temperature for monitoring the slide plate in real time, and then realization pair
The temperature control of friction material.
Further, the sliding stand component include sliding stand and sliding stand base, the sliding stand base lower surface with
The upper surface of the guiding mechanism is fixed, and the lower surface of the sliding stand, the slide plate are accepted in the sliding stand base upper surface
In the groove for being embedded in the sliding stand upper surface, and the upper surface of the slide plate will be higher by the upper surface of the sliding stand.
Further, the sliding stand includes column bedding core, heat conducting pipe and muff, and the side of the column bedding core is provided with
Helical connected in star, the heat conducting pipe is curled up in the groove of the column bedding core side, and the heat conducting pipe outer face is less than institute
The side of column bedding core is stated, the center of the muff is provided with cylindrical recesses, and the insertion for accepting the column bedding core is described
The upper surface of muff is provided with annular groove, the insertion for accepting the slide plate, the annular groove bottom surface and the column
Bedding core top surface is flushed, and the end of the muff is provided with two heat conduction pipe joints, for connecting the humidity control system, institute
State muff side upper end and be provided with thermometer hole, for installing the temperature thermocouple.
Further, the humidity control system also includes heating kind of refrigeration cycle device and return hose, the heating refrigeration
Circulator is connected by the return hose with the heat conduction pipe joint, constitutes return line, and the temperature thermocouple is placed in institute
State in thermometer hole.
Further, the front end of the sliding stand base is provided with bi-lug plate, passes through bearing pin and the connecting rod rod end
Oscillating bearing is hinged.
Preferably, the slide plate is mirror face stainless steel plate.
Preferably, the guiding mechanism is the less spherical guide guidance system of self-friction power, and is fixed by screws in
On the bearing base.
Preferably, the heat conducting pipe is copper tube.
Preferably, the muff is nylon muff.
Preferably, the space between the heat conducting pipe and the column bedding core lateral grooves is filled with heat-conducting silicone grease.
In general, by the contemplated above technical scheme of the present invention compared with prior art, it can obtain down and show
Beneficial effect：
(1) Multifunctional friction Material Testing Machine of the invention, the face pressure that friction material is born is adjusted by vertical oil cylinder
Power, the reciprocating sliding friction of friction material is realized by cross cylinder, and the experiment of friction material is adjusted by humidity control system
Temperature, can be achieved frictional behaviour experiment of the friction material under the working conditions such as different face pressures, speed and temperature.
(2) Multifunctional friction Material Testing Machine of the invention, single friction material sample is contacted with sled surface during test,
And slide-and-guide is carried out from the less guidance system of self-friction power, the parallel of frictional contact surface in sliding process can be effectively ensured
Degree.
Brief description of the drawings
Fig. 1 is that a kind of one side of the embodiment of the present invention slides Multifunctional friction Material Testing Machine structural representation；
Fig. 2 is the slide assemblies exploded pictorial that a kind of one side of the embodiment of the present invention slides Multifunctional friction Material Testing Machine
Figure；
Fig. 3 is that the sliding stand cross-section structure that a kind of one side of the embodiment of the present invention is slided in Multifunctional friction Material Testing Machine shows
It is intended to.
In all accompanying drawings, same reference represents identical structure and part, wherein：The vertical oil cylinder of 1- frames, 2-,
3- cross cylinders, 4- crossbeams, 5- support frames, 6- ring flanges, 7- vertical pressures sensor, 8- samples frock, the examination of 9- friction materials
Sample, 10- mirror face stainless steels slide plate, 11- sliding stands, 12- thermometer holes, 13- heat conduction pipe joint, 14- sliding stands base, 15- balls
Guide rail guidance system, 16- bearing bases, 17- bearing pins, 18- connecting rods, 19- horizontal pressure forces sensor, 20- copper tubes, 21- are not
Become rusty steel bedding core, 22- nylon muffs.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only to explain the present invention, not
For limiting the present invention.As long as in addition, technical characteristic involved in each embodiment of invention described below that
Not constituting conflict between this can just be mutually combined.
Fig. 1 is that a kind of one side of the embodiment of the present invention slides Multifunctional friction Material Testing Machine structural representation, and Fig. 2 is this hair
A kind of bright one side of embodiment slides the slide assemblies decomposing schematic representation of Multifunctional friction Material Testing Machine.As depicted in figs. 1 and 2,
The testing machine includes frame 1, hydraulic system, slide assemblies, humidity control system and computer control system, wherein,
Hydraulic system includes vertical oil cylinder 2, ring flange 6, vertical pressure sensor 7, vertical displacement sensor, cross cylinder
3rd, connecting rod 18, horizontal pressure force sensor 19, horizontal displacement sensors and servo valve block.Vertical oil cylinder 2 is arranged on the top of frame 1
On plate, the vertical inside of oil cylinder 2 is provided with vertical displacement sensor, and the end of the vertical piston of oil cylinder 2 passes through ring flange 6 and vertical pressure
Sensor 7 is connected, and cross cylinder 3 is arranged on housiung separator 4, and horizontal displacement sensors, level are provided with inside cross cylinder 3
The end of oil cylinder 3 is fixed by support frame 5 and the base of frame 1, the pistons end of cross cylinder 3 and the one of horizontal pressure force sensor 19
End connection, the other end of horizontal pressure force sensor 19 is threadably secured connecting rod 18, and the rod end end of connecting rod 18 is provided with
Oscillating bearing, it is that vertical oil cylinder 2 and cross cylinder 3 provide power that servo valve block connects pumping plant by hydraulic oil pipe.
As shown in Fig. 2 slide assemblies are arranged on the upper surface of the bedplate of frame 1, including bearing base 16, spherical guide
Under guidance system 15, sliding stand component, mirror face stainless steel slide plate 10, friction material sample 9, sample frock 8, bearing base 16
End face is connected by screw with the bedplate of frame 1, and spherical guide guidance system 15 is arranged on the upper surface of bearing base 16,
Sliding stand component includes sliding stand 11 and sliding stand base 14, lower surface and the spherical guide guidance system 15 of sliding stand base 14
Upper surface fix, the lower surface of sliding stand 11 is accepted in the upper surface of sliding stand base 14, and friction material sample 9 is embedded in sample
In the circular groove of frock 8, and contacted with the minute surface of mirror face stainless steel slide plate 10.
Fig. 3 is that the sliding stand cross-section structure that a kind of one side of the embodiment of the present invention is slided in Multifunctional friction Material Testing Machine shows
It is intended to.As shown in figure 3, sliding stand 11 is made up of stainless steel bedding core 21, copper tube 20 and nylon muff 22, stainless steel bedding core 21
Side is provided with helical connected in star, and copper tube 20 is curled up in the lateral grooves of stainless steel bedding core 21, and the outer face of copper tube 20 is less than
The side of stainless steel bedding core 21, nylon muff 22 is fixed by screws on the upper surface of sliding stand base 14, nylon muff
22 center is provided with a cylindrical recesses, the insertion for accepting stainless steel bedding core 21, and the top after the insertion of stainless steel bedding core 21
Face is flushed with the cylindrical recesses top surface of nylon muff 22, and the upper surface of nylon muff 22 is used for provided with a circular groove
Accept the insertion of mirror face stainless steel slide plate 10, the minute surface of mirror face stainless steel slide plate 10 outwardly and is higher by the upper end of nylon muff 22
Face.
In a preferred embodiment of the invention, the front end of sliding stand base 14 is provided with bi-lug plate, by bearing pin 17 with connecting
The oscillating bearing of the rod end of extension bar 18 is hinged, and the end of nylon muff 22 is provided with two heat conduction pipe joints 13, with temperature adjustment
System is connected, and the side upper end of nylon muff 22 is provided with a thermometer hole 12, for installing temperature thermocouple.
In a preferred embodiment of the invention, stainless steel bedding core 21 uses heat-conducting silicone grease before embedded nylon muff 22
Fill and the groove on the floating side of stainless steel bedding core 21, prevent from curling up the copper tube 20 in the lateral grooves of stainless steel bedding core 21
Steam is condensed between the cylindrical recesses inwall of nylon muff 22.
In a preferred embodiment of the invention, the appearance and size of the friction material sample 9 is 75 × 7mm of φ, sample work
The circular groove diameter for filling 8 isDepth is 4mm, and the slide plate selection is mirror face stainless steel plate, and appearance and size is φ
155×3mm。
In a preferred embodiment of the invention, the humidity control system is used to realize the temperature adjustment to sliding stand 11,
Including heating kind of refrigeration cycle device, return hose and temperature thermocouple, heating kind of refrigeration cycle device takes external, passes through return hose
It is connected with the heat conduction pipe joint 13 on nylon muff 22, temperature thermocouple is placed in the thermometer hole of sliding stand 11, in real time monitoring
The temperature of mirror face stainless steel slide plate 10.
In a preferred embodiment of the invention, the computer control system is used to control vertical oil cylinder 2 and cross cylinder 3
Motion, and realize and link with humidity control system, vertical pressure sensor 7 can be gathered in real time, horizontal pressure force sensor 19, perpendicular
To the signal of displacement transducer, horizontal displacement sensors and temperature thermocouple.
The Multifunctional friction Material Testing Machine of the present invention, the surface pressure that friction material is born is adjusted by vertical oil cylinder,
The reciprocating sliding friction of friction material is realized by cross cylinder, the experiment temperature of friction material is adjusted by humidity control system
Degree, can be achieved frictional behaviour experiment of the friction material under the working conditions such as different face pressures, speed and temperature.
The Multifunctional friction Material Testing Machine of the present invention, single friction material sample is contacted with sled surface during test, and
Slide-and-guide is carried out from the less guidance system of self-friction power, the parallel of frictional contact surface in sliding process can be effectively ensured
Degree.
As it will be easily appreciated by one skilled in the art that these are only presently preferred embodiments of the present invention, it is not limited to
The present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the invention etc., it should be included in this
Within the protection domain of invention.
Claims (10)
1. a kind of one side slides Multifunctional friction Material Testing Machine, it is characterised in that including frame (1), hydraulic system, Slide Group
Part and humidity control system, wherein,
The hydraulic system includes vertical oil cylinder (2), cross cylinder (3), vertical displacement sensor, horizontal displacement sensors, method
Blue disk (6), vertical pressure sensor (7), connecting rod (18), horizontal pressure force sensor (19) and servo valve block, the vertical oil
Cylinder (2) is arranged on the top plate of the frame (1), and the vertical oil cylinder (2) is internally provided with the vertical displacement sensor, institute
The pistons end for stating vertical oil cylinder (2) is connected by the ring flange (6) with the vertical pressure sensor (7), the level
Oil cylinder (3) is arranged on the crossbeam of the frame (1), and the cross cylinder (3) is internally provided with the horizontal displacement sensors,
The end of the cross cylinder (3) is fixed by support frame (5) and the base of the frame (1), cross cylinder (3) piston
End is connected with one end of the horizontal pressure force sensor (19), and the other end of the horizontal pressure force sensor (19) passes through screw thread
Fixed with the connecting rod (18), it is the vertical oil cylinder (2) and level that the servo valve block connects pumping plant by hydraulic oil pipe
Oil cylinder (3) provides power；
The slide assemblies are arranged on the upper surface of the frame (1) bedplate, including bearing base (16), guiding mechanism,
Sliding stand component, slide plate and sample frock (8), the lower surface of the bearing base (16) pass through screw and the frame (1)
Bedplate is connected, and the guiding mechanism is arranged on the upper surface of the bearing base (16), sample frock (8) upper surface
It is connected by screw thread with the lower surface of the vertical pressure sensor (7), sample frock (8) lower surface is provided with groove, rubs
Material sample (9) is wiped to be embedded in the groove of the sample frock (8), and with the upper surface of the slide plate, the slide plate sets
In on the upper surface of the sliding stand component；
The humidity control system includes temperature thermocouple, the temperature for monitoring the slide plate in real time, and then realizes to friction
The temperature control of material.
2. a kind of one side according to claim 1 slides Multifunctional friction Material Testing Machine, it is characterised in that the slip
Platform component includes sliding stand (11) and sliding stand base (14), sliding stand base (14) lower surface and the guiding mechanism
Upper surface is fixed, and the lower surface of the sliding stand (11) is accepted in sliding stand base (14) upper surface, and the slide plate is embedded in institute
In the groove for stating sliding stand (11) upper surface, and the upper surface of the slide plate will be higher by the upper surface of the sliding stand (11).
3. a kind of one side according to claim 2 slides Multifunctional friction Material Testing Machine, it is characterised in that the slip
Platform (11) includes column bedding core, heat conducting pipe and muff, and the side of the column bedding core is provided with helical connected in star, the heat conducting pipe
Curl up in the groove of the column bedding core side, and the heat conducting pipe outer face is less than the side of the column bedding core, it is described
The center of muff is provided with cylindrical recesses, and the insertion for accepting the column bedding core, the upper surface of the muff is provided with ring
Connected in star, the insertion for accepting the slide plate, the annular groove bottom surface is flushed with the column bedding core top surface, the insulation
The end of set is provided with two heat conduction pipe joints (13), for connecting the humidity control system, muff side upper end
Thermometer hole (12) is provided with, for installing the temperature thermocouple.
4. a kind of one side according to claim 1 or 3 slides Multifunctional friction Material Testing Machine, it is characterised in that described
Humidity control system also includes heating kind of refrigeration cycle device and return hose, and the heating kind of refrigeration cycle device passes through the return hose
It is connected with the heat conduction pipe joint (13), constitutes return line, the temperature thermocouple is placed in the thermometer hole (12).
5. a kind of one side according to claim 1 or 2 slides Multifunctional friction Material Testing Machine, it is characterised in that described
The front end of sliding stand base (14) is provided with bi-lug plate, is cut with scissors by the oscillating bearing of bearing pin (17) and the connecting rod (18) rod end
Connect.
6. a kind of one side according to claim 1 slides Multifunctional friction Material Testing Machine, it is characterised in that the slide plate
For mirror face stainless steel plate (10).
7. a kind of one side according to claim 1 slides Multifunctional friction Material Testing Machine, it is characterised in that the guiding
Mechanism is the less spherical guide guidance system (15) of self-friction power, and is fixed by screws on the bearing base (16).
8. a kind of one side according to claim 3 slides Multifunctional friction Material Testing Machine, it is characterised in that the heat conduction
Manage as copper tube (20).
9. a kind of one side according to claim 3 slides Multifunctional friction Material Testing Machine, it is characterised in that the insulation
Cover for nylon muff (22).
10. a kind of one side according to claim 3 slides Multifunctional friction Material Testing Machine, it is characterised in that described to lead
Space between heat pipe and the column bedding core lateral grooves is filled with heat-conducting silicone grease.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710287950.0A CN106990037B (en) | 2017-04-27 | 2017-04-27 | A kind of single side slides Multifunctional friction Material Testing Machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710287950.0A CN106990037B (en) | 2017-04-27 | 2017-04-27 | A kind of single side slides Multifunctional friction Material Testing Machine |
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| CN106990037A true CN106990037A (en) | 2017-07-28 |
| CN106990037B CN106990037B (en) | 2018-06-08 |
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ID=59418110
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| CN201710287950.0A Active CN106990037B (en) | 2017-04-27 | 2017-04-27 | A kind of single side slides Multifunctional friction Material Testing Machine |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112326288A (en) * | 2020-10-30 | 2021-02-05 | 瀚蓝绿电固废处理(佛山)有限公司 | Open hearth furnace riding wheel running-in device |
| CN113340804A (en) * | 2021-06-07 | 2021-09-03 | 北京理工大学 | Test device for accurately measuring static friction coefficient |
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| CN206945515U (en) * | 2017-04-27 | 2018-01-30 | 武汉海润工程设备有限公司 | A kind of one side slides Multifunctional friction Material Testing Machine |
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| JP2000171372A (en) * | 1998-12-03 | 2000-06-23 | Nissan Diesel Motor Co Ltd | Friction and abrasion testing device |
| CN101339112A (en) * | 2008-08-19 | 2009-01-07 | 东南大学 | Machine tool guiding rail friction wear testing machine |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112326288A (en) * | 2020-10-30 | 2021-02-05 | 瀚蓝绿电固废处理(佛山)有限公司 | Open hearth furnace riding wheel running-in device |
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| CN113340804A (en) * | 2021-06-07 | 2021-09-03 | 北京理工大学 | Test device for accurately measuring static friction coefficient |
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| Publication number | Publication date |
|---|---|
| CN106990037B (en) | 2018-06-08 |
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Effective date of registration: 20220209 Address after: No.88, Binhe North Road, hi tech Zone, Luoyang City, Henan Province Patentee after: LUOYANG SUNRUI SPECIAL EQUIPMENT Co.,Ltd. Address before: 430084 No. nine Wu Dong Street, Qingshan District, Hubei, Wuhan Patentee before: WUHAN HIRUN ENGINEERING EQUIPMENT Co.,Ltd. |
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Address after: No.88, Binhe North Road, hi tech Zone, Luoyang City, Henan Province Patentee after: CSSC Shuangrui (Luoyang) special equipment Co.,Ltd. Address before: No.88, Binhe North Road, hi tech Zone, Luoyang City, Henan Province Patentee before: LUOYANG SUNRUI SPECIAL EQUIPMENT Co.,Ltd. |