CN116008166B - A brake material testing device - Google Patents
A brake material testing device Download PDFInfo
- Publication number
- CN116008166B CN116008166B CN202211725798.7A CN202211725798A CN116008166B CN 116008166 B CN116008166 B CN 116008166B CN 202211725798 A CN202211725798 A CN 202211725798A CN 116008166 B CN116008166 B CN 116008166B
- Authority
- CN
- China
- Prior art keywords
- main shaft
- explosion
- box body
- proof box
- upper main
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
Compared with the prior art, the brake material testing equipment comprises a driving device, an upper main shaft, a lower main shaft, an explosion-proof box body, a rotating speed sensor, a calibration device, a friction torque measuring device, a pressure regulating device and a control system, wherein the driving device is connected with the upper main shaft, the rotating speed sensor is arranged on the upper main shaft, the upper main shaft and the lower main shaft are oppositely arranged, flammable gas with preset concentration is injected into the explosion-proof box body, the calibration device, the friction torque measuring device and the pressure regulating device are all arranged on the lower main shaft, the friction torque measuring device is used for measuring friction torque values of tested materials, the pressure regulating device is used for regulating positive pressure between the two tested materials, and the driving device is in communication connection with the control system so that the driving device can regulate driving force acting on the upper main shaft according to instructions of the control system. The scheme not only can carry out wear resistance test on various materials, but also can measure the friction coefficient of the tested materials.
Description
Technical Field
The application relates to the field of mining test equipment, in particular to brake material test equipment.
Background
The mining winch is generally used for underground operation, flammable gas is easily filled in underground environment, for example, when the mining winch brakes, the high temperature generated by the working of a braking component easily ignites the underground flammable gas to cause safety accidents, so that the mining winch braking equipment has higher requirements on braking materials, the underground environment needs to be simulated for friction coefficient measurement and abrasion test when the braking materials are selected, and in the prior art, no equipment special for end face sliding test is provided, and the application can test the wear resistance and the friction coefficient of various materials under the selected load.
Disclosure of Invention
It is an object of the present application to provide a brake material testing apparatus for obtaining a test of wear resistance and a measurement of friction coefficient between various materials.
The application provides a brake material testing device, which is used for measuring the friction coefficient and the wear degree of a tested material, and comprises the following components:
the device comprises a driving device, an upper main shaft, a lower main shaft, an explosion-proof box body, a rotating speed sensor, a calibration device, a friction torque measuring device, a pressure regulating device and a control system;
The driving device is connected with the upper main shaft and used for driving the upper main shaft to rotate, and the rotating speed sensor is arranged on the upper main shaft;
the upper main shaft and the lower main shaft are oppositely arranged, so that when tested materials are placed on the lower surface of the upper main shaft and the upper surface of the lower main shaft, the two tested materials are placed in the explosion-proof box body and are contacted with each other, friction is generated due to the rotation of the upper main shaft, and flammable gas with preset concentration is injected into the explosion-proof box body;
the calibration device, the friction torque measuring device and the pressure regulating device are arranged on the lower main shaft, the calibration device is used for calibrating the friction torque value measured by the friction torque measuring device before testing, the friction torque measuring device is used for measuring the friction torque value of the tested material, and the pressure regulating device is used for regulating the positive pressure between the two tested materials;
the driving device is in communication connection with the control system, so that the driving device adjusts the driving force acting on the upper spindle according to the instruction of the control system.
Preferably, the driving device includes:
The device comprises a motor, a first gear, a second gear and a transmission rod;
the transmission rod is provided with a first gear belt, the motor is connected with the first gear belt of the transmission rod through the first gear, and when the motor runs, the transmission rod is driven to rotate through the cooperation of the first gear and the first gear belt;
the transmission rod is provided with a second gear belt, the upper main shaft is connected with the second gear belt of the transmission rod through the second gear, and when the transmission rod rotates, the upper main shaft is driven to rotate through the cooperation of the second gear belt and the second gear.
Preferably, the calibration device comprises:
String disc, string, fixed pulley, first load;
The string wire disc is arranged on the lower main shaft, the string wire is wound on the string wire disc, and the first load is suspended through the fixed pulley fixed on the explosion-proof box body.
Preferably, the lower spindle includes:
a shaft housing, a shaft core;
The shaft core is sleeved in the shaft shell and is movably connected with the shaft shell, so that the shaft core drives the tested material placed on the lower main shaft to move along the axial direction;
The pressure regulating device includes:
balance bar, second load and support part;
The supporting part is fixedly connected with the explosion-proof box body, the balance bar is provided with a balance part and is arranged on the supporting part through the balance part, one end of the balance bar is provided with the second load object, the other end of the balance bar is movably connected with the shaft core, when one end of the balance bar is pressed down by the second load object, the other end of the balance bar is pressed up by the balance part, so that the tested material placed on the lower main shaft is pressed towards the tested material placed on the upper main shaft along the axial direction.
Preferably, the apparatus further comprises:
And the exhaust device is an opening which is formed by communicating the side wall of the explosion-proof box body with the inner space and the outer space of the box body.
Preferably, the exhaust apparatus further includes:
and the isolating part is used for isolating the inner space and the outer space of the explosion-proof box body and sealing inflammable gas in the explosion-proof box body, and when the inflammable gas in the explosion-proof box body explodes, the gas expanding in the explosion-proof box body breaks through the isolating part and is discharged out of the explosion-proof box body.
Preferably, the apparatus further comprises:
And the vacuum pump is connected with the exhaust device and is used for pumping out part of air in the explosion-proof box body.
Preferably, the explosion-proof box further includes:
and the air inlet device is used for injecting the inflammable gas into the explosion-proof box body.
Preferably, the apparatus further comprises:
and the temperature sensor is arranged on the upper main shaft or the lower main shaft and is used for measuring the temperature change of the tested material during friction.
Preferably, the flammable gas is methane.
Compared with the prior art, the device for testing the abrasion resistance and the friction coefficient of the tested materials comprises a driving device, an upper main shaft, a lower main shaft, an explosion-proof box body, a rotating speed sensor, a calibration device, a friction torque measuring device, a pressure regulating device and a control system, wherein the driving device is connected with the upper main shaft and used for driving the upper main shaft to rotate, the rotating speed sensor is arranged on the upper main shaft, the upper main shaft and the lower main shaft are oppositely arranged, when the tested materials are placed on the lower surface of the upper main shaft and the upper surface of the lower main shaft, the two tested materials are placed in the explosion-proof box body and are contacted with each other and generate friction due to the rotation of the upper main shaft, flammable gas with preset concentration is injected into the explosion-proof box body, the calibration device, the friction torque measuring device and the pressure regulating device are all arranged on the lower main shaft, the calibration device is used for calibrating friction torque values measured by the friction torque measuring device before testing, the friction torque measuring device is used for measuring the friction torque values measured by the friction torque measuring device, the tested materials are used for controlling the driving force regulating system and the driving force is used for controlling the system to be connected with the driving device. The scheme not only can carry out wear resistance test on various materials, but also can measure the friction coefficient of the tested materials.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the accompanying drawings in which:
FIG. 1 is a schematic view of one embodiment of an apparatus according to the present application;
FIG. 2 is an enlarged view of a portion of the device side view of the present application;
FIG. 3 is a schematic cross-sectional view of the lower spindle of the apparatus of the present application;
the same or similar reference numbers in the drawings refer to the same or similar parts.
Detailed Description
The application provides a brake material testing device, which is used for measuring the friction coefficient and the wear degree of a tested material, and comprises the following components:
the device comprises a driving device, an upper main shaft, a lower main shaft, an explosion-proof box body, a rotating speed sensor, a calibration device, a friction torque measuring device, a pressure regulating device and a control system;
The driving device is connected with the upper main shaft and used for driving the upper main shaft to rotate, and the rotating speed sensor is arranged on the upper main shaft;
the upper main shaft and the lower main shaft are oppositely arranged, so that when tested materials are placed on the lower surface of the upper main shaft and the upper surface of the lower main shaft, the two tested materials are placed in the explosion-proof box body and are contacted with each other, friction is generated due to the rotation of the upper main shaft, and flammable gas with preset concentration is injected into the explosion-proof box body;
the calibration device, the friction torque measuring device and the pressure regulating device are arranged on the lower main shaft, the calibration device is used for calibrating the friction torque value measured by the friction torque measuring device before testing, the friction torque measuring device is used for measuring the friction torque value of the tested material, and the pressure regulating device is used for regulating the positive pressure between the two tested materials;
the driving device is in communication connection with the control system, so that the driving device adjusts the driving force acting on the upper spindle according to the instruction of the control system.
The above-described apparatus of the present application is further described below in conjunction with fig. 1,2 and 3.
The upper spindle 2 may be a cylindrical object, the driving device 1 is disposed at one end of the upper spindle 2 to drive the upper spindle 2 to rotate, the other end of the upper spindle 2 is disposed with a tested material, i.e. the tested material is disposed on the lower surface of the upper spindle 2, the lower spindle 3 is disposed opposite to the upper spindle 2, another tested material is disposed on the upper surface of the lower spindle 3, when the upper spindle 2 or the lower spindle 3 receives force in opposite directions, the two tested materials are contacted and form positive pressure, when the upper spindle 2 is driven by the driving device 1 to rotate, the lower spindle 3 is fixed, friction can be generated between the two materials at this time, so as to determine the abrasion degree of the tested material.
The two tested materials can be placed into an explosion-proof box body, combustible gas with preset concentration is injected into the explosion-proof box body to simulate the underground environment, when friction is generated between the two tested materials, the temperature of the two tested materials is increased, and when the temperature reaches the ignition point of the combustible gas, the combustible gas is ignited.
When the lower spindle 3 can freely rotate, the friction coefficient of the tested materials can be measured through the calibration device 6 and the friction moment measuring device 4, and the pressure regulating device 5 can change the positive pressure between the two tested materials according to actual testing conditions, so that different measuring requirements can be met.
Other additional functions may be added to the control system, such as control using a PLC (programmable logic controller ). The system can also be added with curve recording and data processing functions to realize measurement display and data processing of various parameters, such as time, friction torque curve, time, friction coefficient curve, time, temperature curve and the like. The measurement data can be automatically saved and played back, the test data can be saved in real time, the printed measurement data, test reports and curves are output, and texts are provided. The system may also incorporate components that exhibit positive pressure, maximum friction torque, maximum coefficient of friction, average friction torque, average coefficient of friction, temperature, number of revolutions, time, etc.
In some embodiments of the present application, the driving device 1 comprises a motor 11, a first gear, a second gear and a transmission rod 12, wherein the transmission rod is provided with a first gear belt 121, the motor is connected with the first gear belt 121 of the transmission rod 12 through the first gear, when the motor 11 operates, the transmission rod 12 is driven to rotate through the cooperation of the first gear and the first gear belt 121, the transmission rod 12 is provided with a second gear belt 122, the upper main shaft 2 is connected with the second gear belt 122 of the transmission rod 12 through the second gear, and when the transmission rod 12 rotates, the upper main shaft 2 is driven to rotate through the cooperation of the second gear belt 122 and the second gear.
The driving device 1 can be driven by the motor 11, the driving device adopts the first gear, the second gear and the driving rod 12 with the gear belts 121 and 122 to drive, and the driving device 1 of some other equipment adopts the belt to drive, so that the accuracy of the test can be influenced due to the slipping of the belt when the test is carried out.
In some embodiments of the application, the calibrating device comprises a string disc 61, a string 62, a fixed pulley 63 and a first load 64, wherein the string disc 61 is arranged on the lower spindle 3, the string 62 is wound on the string disc 61, and the first load is suspended by the fixed pulley 63 fixed on the explosion-proof box body.
The calibration device 6 is used for calibrating the friction moment before the test starts, the string 62 generates a pulling force on the lower spindle 3 after the first load 64 is mounted, and the lower spindle 3 generates a acting force on the friction moment measuring device 4 due to the influence of the pulling force, so that the friction moment measuring device 4 displays a friction moment value.
The friction torque value is obtained by measuring the mass of the first load 64 and the radius of the string disc 61, and the measured friction torque value is consistent with or has a very small error with the friction torque value displayed by the friction torque measuring device 4, where P is the mass of the first load 64 and L is the radius of the string disc 61. And according to coulomb law, μ=f/N, where μ is a friction coefficient, F is a friction force, N is a positive pressure value between two materials under test, μ=m/r×n, where M is a friction torque value, and R is a friction radius of the materials under test.
In some embodiments of the present application, the lower spindle comprises a spindle shell 31 and a spindle core 32, wherein the spindle core 32 is sleeved in the spindle shell 31 and is movably connected with the spindle shell 32, so that the spindle core 32 drives a tested material placed on the lower spindle 3 to move along the axis direction;
The pressure adjusting device 5 comprises a balance rod 51, a second load 52 and a supporting part 54, wherein the supporting part 54 is fixedly connected with the explosion-proof box body, the balance rod 51 is provided with a balance part 53 and is arranged on the supporting part 54 through the balance part 53, one end of the balance rod 51 is used for mounting the second load 52, the other end of the balance rod is movably connected with the shaft core 32, and when one end of the balance rod 51 is pressed down by the second load 52, the other end of the balance rod 51 is pressed up through the balance part 53, so that a tested material placed on the lower spindle 3 is pressed towards a tested material placed on the upper spindle 2 along the axial direction.
As shown in fig. 2 and 3, the lower spindle 3 is provided with a pressure adjusting device 5, and the shaft housing 31 and the shaft center 32 of the lower spindle 3 may be nested in an irregular structure so that the shaft core 32 may move in the axial direction and the shaft core 32 is prevented from rotating about the axis relative to the shaft housing 31. The pressure adjusting device 5 is used for adjusting the positive pressure between two tested materials, and the device adopts the lever principle, and can adjust the positive pressure by changing the mass of the second load 52 or adjusting the lever proportion. That is, the adjusting support 53 is positioned at the position of the balance bar 51, and the arms of the lower and upper pressures of the balance bar 51 are increased or decreased.
In some embodiments of the application, the apparatus further comprises a vent 7, wherein the vent 7 is an opening of the side wall of the explosion-proof box body communicating with the internal and external space of the box body.
The exhaust device 7 is used for exhausting the expanded air by the exhaust device 7 when the temperature of the tested material is increased to cause the inflammable gas to ignite, so as not to damage devices in the explosion-proof box body.
In some embodiments of the present application, the exhaust apparatus further includes a separation part 71, the separation part 71 separating an inner space and an outer space of the explosion-proof housing to seal inflammable gas in the explosion-proof housing, and when the inflammable gas in the explosion-proof housing explodes, the gas expanded in the explosion-proof housing breaks through the separation part 71 to be exhausted out of the explosion-proof housing.
The preferable isolation part can be a layer of plastic film for isolating the air flow passage of the inner space and the outer space of the explosion-proof box body.
In some embodiments of the application, the apparatus further comprises a vacuum pump coupled to the exhaust for drawing a portion of the air within the explosion proof enclosure.
When the inflammable gas is injected, the air in the explosion-proof box body can be exhausted first, and the air and the inflammable gas can be exhausted simultaneously.
In some embodiments of the application, the explosion proof housing further comprises an air inlet means 7, said air inlet means 7 being adapted to inject said flammable gas into said explosion proof housing.
In some embodiments of the application, the apparatus further comprises a temperature sensor 8, the temperature sensor 8 being arranged on the upper spindle 2 or the lower spindle 3 for measuring the temperature change when the tested material is rubbed.
The temperature sensor 8 may be communicatively coupled to a control system for monitoring the temperature of the material under test as it rubs.
In some embodiments of the application, the flammable gas is methane.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned. Furthermore, it is evident that the word "comprising" does not exclude other elements or steps, and that the singular does not exclude a plurality. A plurality of units or means recited in the apparatus claims can also be implemented by means of one unit or means in software or hardware. The terms first, second, etc. are used to denote a name, but not any particular order.
Claims (7)
1. A brake material testing apparatus for determining the coefficient of friction and the degree of wear of a test material, the apparatus comprising:
the device comprises a driving device, an upper main shaft, a lower main shaft, an explosion-proof box body, a rotating speed sensor, a calibration device, a friction torque measuring device, a pressure regulating device and a control system;
The driving device is connected with the upper main shaft and used for driving the upper main shaft to rotate, and the rotating speed sensor is arranged on the upper main shaft;
the upper main shaft and the lower main shaft are oppositely arranged, so that when tested materials are placed on the lower surface of the upper main shaft and the upper surface of the lower main shaft, the two tested materials are placed in the explosion-proof box body and are contacted with each other, friction is generated due to the rotation of the upper main shaft, and flammable gas with preset concentration is injected into the explosion-proof box body;
the calibration device, the friction torque measuring device and the pressure regulating device are arranged on the lower main shaft, the calibration device is used for calibrating the friction torque value measured by the friction torque measuring device before testing, the friction torque measuring device is used for measuring the friction torque value of the tested material, and the pressure regulating device is used for regulating the positive pressure between the two tested materials;
The driving device is in communication connection with the control system so that the driving device can adjust the driving force acting on the upper spindle according to the instruction of the control system;
Wherein, the drive arrangement includes:
The device comprises a motor, a first gear, a second gear and a transmission rod;
the transmission rod is provided with a first gear belt, the motor is connected with the first gear belt of the transmission rod through the first gear, and when the motor runs, the transmission rod is driven to rotate through the cooperation of the first gear and the first gear belt;
the transmission rod is provided with a second gear belt, the upper main shaft is connected with the second gear belt of the transmission rod through the second gear, and when the transmission rod rotates, the upper main shaft is driven to rotate through the cooperation of the second gear belt and the second gear;
The calibration device comprises:
String disc, string, fixed pulley, first load;
the string wire disc is arranged on the lower spindle, the string wire is wound on the string wire disc, and the first load is suspended through the fixed pulley fixed on the explosion-proof box body;
the lower spindle includes:
a shaft housing, a shaft core;
The shaft core is sleeved in the shaft shell and is movably connected with the shaft shell, so that the shaft core drives the tested material placed on the lower main shaft to move along the axial direction;
The pressure regulating device includes:
balance bar, second load and support part;
The supporting part is fixedly connected with the explosion-proof box body, the balance bar is provided with a balance part and is arranged on the supporting part through the balance part, one end of the balance bar is provided with the second load object, the other end of the balance bar is movably connected with the shaft core, when one end of the balance bar is pressed down by the second load object, the other end of the balance bar is pressed up by the balance part, so that the tested material placed on the lower main shaft is pressed towards the tested material placed on the upper main shaft along the axial direction.
2. The apparatus of claim 1, wherein the apparatus further comprises:
And the exhaust device is an opening which is formed by communicating the side wall of the explosion-proof box body with the inner space and the outer space of the box body.
3. The apparatus of claim 2, wherein the exhaust device further comprises:
and the isolating part is used for isolating the inner space and the outer space of the explosion-proof box body and sealing inflammable gas in the explosion-proof box body, and when the inflammable gas in the explosion-proof box body explodes, the gas expanding in the explosion-proof box body breaks through the isolating part and is discharged out of the explosion-proof box body.
4. The apparatus of claim 2, wherein the apparatus further comprises:
And the vacuum pump is connected with the exhaust device and is used for pumping out part of air in the explosion-proof box body.
5. The apparatus of claim 1, wherein the explosion proof housing further comprises:
and the air inlet device is used for injecting the inflammable gas into the explosion-proof box body.
6. The apparatus of claim 1, wherein the apparatus further comprises:
and the temperature sensor is arranged on the upper main shaft or the lower main shaft and is used for measuring the temperature change of the tested material during friction.
7. The apparatus of claim 1 wherein the flammable gas is methane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211725798.7A CN116008166B (en) | 2022-12-30 | 2022-12-30 | A brake material testing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211725798.7A CN116008166B (en) | 2022-12-30 | 2022-12-30 | A brake material testing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116008166A CN116008166A (en) | 2023-04-25 |
| CN116008166B true CN116008166B (en) | 2025-05-27 |
Family
ID=86031409
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211725798.7A Active CN116008166B (en) | 2022-12-30 | 2022-12-30 | A brake material testing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116008166B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2994127A1 (en) * | 2018-02-07 | 2019-08-07 | Glen Brown | Apparatus for measurement of road surface friction |
| DE102018008949A1 (en) * | 2018-06-11 | 2019-12-12 | Karlsruher Institut für Technologie | Test device for rotary hammers |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0713585B2 (en) * | 1986-09-24 | 1995-02-15 | 日立化成工業株式会社 | Inertial brake testing machine |
| JP5001625B2 (en) * | 2006-10-30 | 2012-08-15 | トヨタ自動車株式会社 | Friction test equipment |
| JP4783816B2 (en) * | 2007-08-28 | 2011-09-28 | 長島鋳物株式会社 | Apparatus for measuring coefficient of friction on lid surface for underground structure and method of use |
-
2022
- 2022-12-30 CN CN202211725798.7A patent/CN116008166B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2994127A1 (en) * | 2018-02-07 | 2019-08-07 | Glen Brown | Apparatus for measurement of road surface friction |
| DE102018008949A1 (en) * | 2018-06-11 | 2019-12-12 | Karlsruher Institut für Technologie | Test device for rotary hammers |
Also Published As
| Publication number | Publication date |
|---|---|
| CN116008166A (en) | 2023-04-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR100426970B1 (en) | A Multi-functional Friction and Abrasion Tester of a Rotary Machine Component | |
| RU165648U1 (en) | TEST FOR TURBO-SCREW ENGINES TEST | |
| CN103528741A (en) | Device and method for testing friction torque of bearing under actual working condition | |
| US3505863A (en) | Method and apparatus for testing the acceleration of prime movers | |
| CN116008166B (en) | A brake material testing device | |
| CN109342060A (en) | The test device of axial bearing foil | |
| CN105865787A (en) | Dynamic performance tester for high-speed precise bearings | |
| US5661247A (en) | Rotational displacement apparatus with ultra-low torque and high thrust load capability | |
| US10613010B2 (en) | Intertial torque device for viscometer calibration and rheology measurements | |
| NO349192B1 (en) | Optical fluidic methods for a rheometer | |
| CN205748941U (en) | A kind of tyre last detection equipment | |
| CN103383342A (en) | Measuring device for rope friction coefficient and measuring method thereof | |
| CN219675468U (en) | Multi-working-condition removable sealing ring performance test device | |
| US5315864A (en) | Start/stop method to determine static gel strength | |
| CN102221435A (en) | Measuring apparatus of foil dynamic pressure air bearing resistance torque | |
| JP3283357B2 (en) | Thrust bearing life test equipment | |
| WO2019144625A1 (en) | Motor testing fixture | |
| CN116773385A (en) | Totally-enclosed electromagnetic loading type deep sea high-pressure friction testing machine | |
| CN207675447U (en) | A kind of braking automobile device for detecting performance | |
| CN107631709A (en) | A kind of detection means of sealing test | |
| CN113483999A (en) | Valve performance testing method and valve performance testing device | |
| CN209102378U (en) | The test device of axial bearing foil | |
| CN213543918U (en) | Multi-working-condition sealing leakage quantity online observation and evaluation device | |
| CN109708880B (en) | Static load fatigue test device for yaw speed reducer test bed | |
| CN219657665U (en) | Experimental device for testing critical rotation speed of rotary oil seal |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |