CN114046989B - Gear durability experimental device and process method thereof - Google Patents
Gear durability experimental device and process method thereof Download PDFInfo
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Abstract
The invention provides a gear durability experimental device and a process method thereof, the device comprises a computer, a rack, a transmission shaft, a driving gear, a motor, an infrared thermometer, a torque sensor, a vibration sensor, two groups of induction heating assemblies and a torque applying assembly, wherein the gear to be tested is arranged on the transmission shaft and is meshed with the driving gear, the motor is connected with the driving gear, the two groups of induction heating assemblies are respectively positioned at two sides of the meshing part of the driving gear and the gear to be tested, and the torque applying assembly is connected with the middle lower end of the transmission shaft. The method comprises the following steps: firstly, inputting related parameters of temperature and torque into a computer, controlling an induction heating coil to enable the tooth profile temperature of a gear to be measured to reach a target temperature range, controlling an electromagnetic clutch to load an inertia rotor in a gradient manner to enable the gear to be in different heavy-load environments, and judging whether the gear fails or not. The variable load experiment device effectively solves the problem of variable load experiment of the gear in a high-temperature environment, improves the experiment efficiency, and reduces the manpower and financial resources consumed by the experiment.
Description
Technical Field
The invention relates to the technical field of metallurgical machinery, in particular to a gear durability experimental device and a gear durability experimental process.
Background
With the development of the manufacturing industry in China, gears are the most important transmission parts of engines, and are widely applied to mechanical equipment in the industries of aviation, transportation, engineering machinery and the like. Since the 21 st century, a great deal of high and new technologies, particularly information technologies, are applied to mechanical equipment, so that higher requirements are put forward on the reliability level of the mechanical equipment, and upgrading of basic component industries such as gears and the like is beneficial to improvement of the core competitiveness of the manufacturing industry of the mechanical equipment in China. With the steady promotion of the comprehensive national force in China, the faced safety situation is increasingly complex and changeable, the pressure of maintaining safety and benefits is continuously increased, and for the helicopter which plays a significant role in modern quick rescue, the reliability of a transmission system of the helicopter determines the level of the use performance of the helicopter. For the helicopter, the possibility of survival of search and rescue personnel and rescued personnel can be effectively improved by improving the reliability of a transmission system.
As for the gear serving as a core component in a gear transmission system, the guarantee of the durability of the gear has important practical significance for the normal work of the whole transmission system. Meanwhile, the durability of the gear is also one of the important indexes in gear production and manufacturing, the durability test of the gear must be strictly verified in the product development stage, and the durability test is the test which consumes most time and cost. Under the conventional service life experimental condition, the gear durability experiment under the high-temperature condition cannot be realized by adopting the room temperature experiment; the constant load simulation experiment is carried out by applying the balance weight load, the variable load experiment cannot be realized, in addition, the service life distribution of the gears in different working conditions is relatively discrete, a large amount of manpower and financial resources are required to be consumed, and the cost is high.
Disclosure of Invention
According to the above-mentioned conventional life test conditions, the gear durability test under the external high temperature condition cannot be realized by performing the test at room temperature; the gear durability experiment device and the gear durability experiment process have the technical problems that a fixed load simulation experiment is carried out by applying load, a variable load experiment cannot be realized, in addition, the service life distribution of gears in different working conditions is relatively discrete, a large amount of manpower and financial resources are consumed, and an enterprise is difficult to bear. The invention mainly carries out a variable load durability experiment under high temperature-heavy load on a gear to be tested through a rack, a driving gear, a transmission shaft, an electromagnetic brake valve which is positioned at the upper end of the rack and connected with the upper end of the transmission shaft, an infrared thermometer, a torque sensor, a vibration sensor, an induction heating assembly and a torque applying assembly which are connected with the upper end of the rack, and adopts the following process method: firstly, temperature and torque related parameters are input into a computer, a heating coil is controlled to enable the tooth profile temperature of a gear to be tested to reach a target temperature range, an electromagnetic clutch is controlled to load an inertia rotor in a gradient mode to enable the gear to be tested to be in different heavy load environments, whether the gear to be tested fails or not is judged, and therefore the problem that the gear is subjected to variable load experiments in a high-temperature environment is effectively solved, the experiment efficiency is improved, and manpower and financial resources consumed by the experiments are reduced.
The technical means adopted by the invention are as follows:
a gear durability test apparatus comprising: the device comprises a computer, a rack, a transmission shaft connected with the rack, a driving gear, a motor connected with the computer, an infrared thermometer, a torque sensor, a vibration sensor, two groups of induction heating assemblies and a torque applying assembly, wherein a gear to be measured is arranged on the transmission shaft and is meshed with the driving gear;
the two groups of induction heating assemblies are arranged on the rack, are respectively positioned on two sides of the meshing position of the driving gear and the gear to be measured and are used for heating the gear to be measured; the torque applying assembly is arranged on the rack, is connected with the middle lower end of the transmission shaft and is used for realizing that the gear to be tested is positioned in different heavy load environments; the combination of the two groups of induction heating assemblies and the torque applying assembly is used for carrying out a variable load durability test on the gear to be tested under high temperature-heavy load; the infrared thermometer is arranged on the rack and used for detecting the temperature of the heated tooth profile of the gear to be detected;
the torque sensor is connected with the bottom end of the transmission shaft through the coupler and used for measuring and calculating the torque of the transmission shaft in the experiment process; the two vibration sensors are symmetrically arranged on two sides of the rack and used for measuring and calculating the amplitude generated by the gear to be measured in the experimental process; and judging whether the gear to be detected fails or not through the torque sensor and the vibration sensor.
Furthermore, the upper part of the transmission shaft is connected with a top plate of the rack through a bearing, the upper end penetrating out of the rack is connected with an electromagnetic brake valve, the electromagnetic brake valve is fixedly connected with the upper end face of the top plate of the rack, and a friction plate of the electromagnetic brake valve is in clearance fit with the rough surface at the upper end of the transmission shaft when the electromagnetic brake valve is not in operation, so that emergency braking in the experimental process is realized.
Furthermore, the transmission shaft is connected with the middle plate of the rack through a thrust bearing, the transmission shaft is also connected with a flange shaft sleeve and a shaft sleeve, the flange shaft sleeve is fixed on the lower end face of the middle plate of the rack through a bolt, one side of the shaft sleeve is in contact connection with the bottom end of the flange shaft sleeve, and the other side of the shaft sleeve is in contact connection with the top of the torque application assembly; the transmission shaft positions the gear to be tested through the thrust bearing and the shaft sleeve.
Further, two sets of induction heating subassemblies are intermediate frequency heating subassembly and high frequency heating subassembly respectively, intermediate frequency heating subassembly comprises first drive assembly and the intermediate frequency heating coil of being connected with first drive assembly, high frequency heating subassembly comprises second drive assembly and the high frequency heating coil of being connected with the second drive assembly, high frequency heating coil and intermediate frequency heating coil distribute in the both sides of driving gear and the gear engagement department that awaits measuring, first drive assembly and second drive assembly are used for driving intermediate frequency heating coil and high frequency heating coil motion respectively, heat the gear flank profile that awaits measuring.
Furthermore, the first driving assembly and the second driving assembly have the same structure, each driving assembly consists of a servo motor, a lead screw, a movable table and a hydraulic cylinder, the servo motors on the two sides are fixedly connected with the upper surfaces of the two side plates of the rack respectively, an output shaft of the servo motor is connected with the upper end of the lead screw, the lower end of the lead screw is connected with the lower end surface of the side plate of the rack through a bearing, the movable table is connected on the lead screw and forms a screw pair with the lead screw, the side edge of the movable table and the side plate of the rack form a sliding pair, and the movable table is driven to move up and down through the rotation of the lead screw;
the hydraulic cylinders on two sides are respectively fixed on the mobile platforms on two sides and are respectively connected with the tail ends of the medium-frequency heating coil and the high-frequency heating coil to respectively drive the medium-frequency heating coil and the high-frequency heating coil to perform radial feeding motion; and the coil adjusting device of the medium-frequency heating coil is the same as the high-frequency heating coil and is respectively connected with a medium-frequency induction heating power supply and a high-frequency induction heating power supply. Through adopting high frequency induction heating and intermediate frequency induction heating to combine together, independently adjust both, it is even to realize gear profile temperature, and then realizes the durability experiment of gear under the high temperature condition for the experimental environment of gear more is close actual operating environment.
Furthermore, the torque applying assemblies are provided with a plurality of components, each component comprises an inertia rotor, a torque block, an electromagnetic clutch and a tray, the trays are fixed on the rack, the inertia rotors are arranged in the trays, the torque blocks are arranged in grooves of the inertia rotors, the surface of an inner hole of each inertia rotor is connected with the outer side of the corresponding electromagnetic clutch, and the inner side of each electromagnetic clutch is connected with the outer surface of the transmission shaft; after the electromagnetic clutch is unlocked, the inertia rotor is in contact friction with the rough surface of the tray through a roller arranged at the lower end of the inertia rotor, so that the inertia rotor is freely braked;
the number of inertia rotors applied to the transmission shaft is increased in sequence in a gradient manner, so that the heavy load applied to the gear to be tested is changed, multiple times of variable load of one-time test of the gear to be tested under the heavy load condition is realized, and the problem that the load cannot be changed in the durability test process can be solved.
The invention also provides a process method of the gear durability experimental device, which comprises the following steps:
s1: carrying out no-load transmission quality inspection on the gear to be tested, and setting the average value of the vibration amplitude of the gear to be tested as a vibration calibration parameter M 0 Setting a torque parameter M 1 、M 2 、M 3 Failure time parameter T, experimental preset temperature T of input gear tooth profile, tooth crest allowable temperature difference [ T [ ] 1 ]Allowable temperature difference at tooth bottom [ T ] 2 ]Load M, high frequency heating coil pitch addendum X 1 Pitch of mid-frequency heating coil and tooth bottom X 2 Unit distance of movement X 0 Destruction time threshold t 0 ；
S2: temperature loading: the computer controls the servo motor and the hydraulic cylinder to enable the high-frequency heating coil to move to a position which is away from the gear tooth crest X to be measured 1 The intermediate frequency heating coil moves to the gear bottom X to be measured 2 Simultaneously connecting a high-frequency induction heating power supply and a medium-frequency induction heating power supply, heating the tooth profile of the gear to be measured, and measuring and calculating the tooth top temperature T of the gear to be measured by an infrared thermometer 1 Tooth bottom temperature T 2 If | T 1 -T|≤[T 1 ]Keeping the position of the high-frequency heating coil unchanged, otherwise when T 1 when-T is more than 0, the high-frequency heating coil moves outwards by unit distance X 0 When T is 1 When T is less than 0, the high-frequency heating coil moves inward by unit distance X 0 Up to | T 1 -T|≤[T 1 ]If | T-T 2 |≤[T 2 ]Keeping the position of the medium-frequency heating coil unchanged, otherwise when T-T 2 When the temperature is more than 0 ℃, the medium-frequency heating coil moves inwards by a unit distance X 0 When T-T 2 ＜0When the medium-frequency heating coil moves outwards by a unit distance X 0 Up to | T-T 2 |≤[T 2 ]；
S3: stress loading: torque parameter M 1 Corresponds to n 1 An inertial rotor, torque parameter M 2 Corresponds to n 2 An inertial rotor, torque parameter M 3 Corresponds to n 3 After the temperature of the tooth profile of the gear to be measured is uniform, the computer controls the electromagnetic clutch to enable n to be measured 1 An inertial rotor is applied to the drive shaft and n is controlled if the applied torque is varied 2 An inertial rotor, n 3 The inertia rotors are sequentially applied to the transmission shaft, so that the gear to be tested is in different heavy load environments;
s4: judging the failure of the gear and stopping the test: measuring the amplitude M by means of a vibration sensor max And M min Measuring a time-varying torque curve through a torque sensor; if it is
When the curve of the torque changing along with the time does not have a sudden drop, the test is continued until M is more than M 0 (ii) a If M > M 0 ，t＞t 0 If the torque curve is suddenly reduced along with the time, judging that the gear sample to be tested is invalid, immediately controlling the electromagnetic clutch by the computer to enable the inertia rotor to be completely separated from the transmission shaft, and stopping the inertia rotor by using free friction of the rotating wheel at the bottom to stop the test; if M > M 0 ，t≤t 0 If the curve of the torque variation with time does not show a sudden drop, the test is continued until M is more than M 0 ，t＞t 0 。
Further, in step S1, the method for checking the no-load transmission quality of the gear to be tested includes: fixing the gear to be tested on an experimental device, idling at a speed of 400r/m under the condition of not setting a load, observing the vibration condition of the experimental device, and re-installing the gear to be tested if the unqualified countershaft condition occurs until the countershaft is qualified.
Compared with the prior art, the invention has the following advantages:
1. compared with the room temperature condition of a conventional life test, the durability test device and the process method thereof provided by the invention have the advantages that the high-frequency induction heating and the medium-frequency induction heating are combined and independently adjusted, so that the uniform temperature of the tooth profile of the gear is realized, the durability test of the gear under the high-temperature condition is further realized, and the test environment of the gear is closer to the actual working environment.
2. According to the gear durability experimental device and the gear durability experimental process, the number of the inertia rotors applied to the transmission shaft is increased in a sequential gradient mode, so that the heavy load applied to the tested gear is changed, multiple times of load change of one-time experiment of the tested gear under the heavy load condition is achieved, and the problem that the load cannot be changed in the durability experimental process can be solved.
In conclusion, the technical scheme of the invention can solve the problem that the durability test of the gear under the high-temperature condition cannot be realized by adopting the room temperature test under the conventional service life test condition; the method has the advantages that the constant load simulation experiment is carried out by applying the balance weight load, the variable load experiment cannot be realized, in addition, the service life distribution of the gears in different working conditions is relatively discrete, a large amount of manpower and financial resources are required to be consumed, and the problem that enterprises are difficult to bear is solved.
Based on the reasons, the invention can be widely popularized in the field of mechanical equipment in industries such as aviation, transportation, engineering machinery and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic view of the structure of the apparatus of the present invention.
FIG. 2 is a schematic view of an induction heating assembly of the apparatus of the present invention.
FIG. 3 is a schematic view of the torque application assembly of the apparatus of the present invention.
FIG. 4 is a schematic view of the inertial rotor of the torque application assembly of the apparatus of the present invention.
FIG. 5 is a cross-sectional view of the inertial rotor configuration of the torque application assembly of the apparatus of the present invention.
FIG. 6 is a schematic diagram showing the spacing between the coil and the heated gear in the induction heating assembly of the apparatus of the present invention.
FIG. 7 is a flow chart of the method of the present invention.
In the figure: 1. a torque sensor; 2. a vibration sensor; 3. a computer; 4. an induction heating assembly; 401. a high-frequency heating coil; 402. a medium-frequency heating coil; 403. a hydraulic cylinder; 404. a mobile station; 405. a lead screw; 406. a servo motor; 5. an infrared thermometer; 6. a medium-frequency induction heating power supply; 7. an electromagnetic brake valve; 8. a drive shaft; 9. a motor; 10. a driving gear; 11. a gear to be tested; 12. a frame; 13. a high-frequency induction heating power supply; 14. a torque application assembly; 141. an electromagnetic clutch; 142. a torque block; 143. an inertial rotor; 144. a roller; 15. a thrust bearing; 16. a flange shaft sleeve; 17. a shaft sleeve.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. Any specific values in all examples shown and discussed herein are to be construed as exemplary only and not as limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
As shown in the figure, the invention provides a gear durability test device, which comprises: the device comprises a computer 3, a rack 12, a transmission shaft 8 connected with the rack 12, a driving gear 10, a motor 9 electrically connected with the computer 3, an infrared thermometer 5, a torque sensor 1, a vibration sensor 2, two groups of induction heating assemblies 4 and a torque applying assembly 14, wherein a gear 11 to be tested is installed on the transmission shaft 8 through a key and is in meshed connection with the driving gear 10, and the motor 9 is installed on a back plate of the rack 12, is connected with the driving gear 10 and is used for driving the driving gear 10 and the gear 11 to be tested to rotate in a meshed mode;
the two groups of induction heating assemblies 4 are arranged on the rack 12, are respectively positioned at two sides of the meshing position of the driving gear 10 and the gear 11 to be measured and are used for heating the gear 11 to be measured; the torque applying assembly 14 is mounted on the frame 12, connected with the middle lower end of the transmission shaft 8, and used for realizing that the gear 11 to be tested is in different heavy load environments; the combination of the two groups of induction heating assemblies 4 and the torque applying assembly 14 is used for carrying out a variable load durability test on the gear 11 to be tested under high temperature and heavy load; the infrared thermometer 5 is arranged on the lower end face of the top plate of the frame 12 and is used for detecting the temperature of the heated tooth profile of the gear 11 to be detected;
the torque sensor 1 is connected with the bottom end of the transmission shaft 8 through a coupler and is used for measuring and calculating the torque of the transmission shaft 8 in the experimental process; the two vibration sensors 2 are symmetrically arranged on two sides of the rack 12, are positioned at the middle end of the rack 12 and are used for measuring and calculating the amplitude generated by the gear 11 to be measured in the experimental process; whether the gear 11 to be measured fails or not is judged by the torque sensor 1 and the vibration sensor 2.
As a preferred embodiment, the upper part of the transmission shaft 8 is connected with a top plate of the frame 12 through a bearing, the upper end penetrating out of the frame 12 is connected with an electromagnetic brake valve 7, the electromagnetic brake valve 7 is fixedly connected with the upper end face of the top plate of the frame 12, and a friction plate of the electromagnetic brake valve 7 is in clearance fit with a rough surface at the upper end of the transmission shaft 8, so that emergency braking in the experimental process is realized.
As a preferred embodiment, the transmission shaft 8 is connected with the middle plate of the frame 12 through a thrust bearing 15, the transmission shaft 8 is further connected with a flange shaft sleeve 16 and a shaft sleeve 17, the flange shaft sleeve 16 is fixed on the lower end surface of the middle plate of the frame 12 through a bolt, one side of the shaft sleeve 17 is in contact connection with the bottom end of the flange shaft sleeve 16, and the other side of the shaft sleeve 17 is in contact connection with the top of the torque applying assembly 14; the transmission shaft 8 positions the gear 11 to be tested through the thrust bearing 15 and the shaft sleeve 17 together.
In a preferred embodiment, the two groups of induction heating assemblies 4 are respectively a medium-frequency heating assembly and a high-frequency heating assembly, the medium-frequency heating assembly is composed of a first driving assembly and a medium-frequency heating coil 402 connected with the first driving assembly, the high-frequency heating assembly is composed of a second driving assembly and a high-frequency heating coil 401 connected with the second driving assembly, the high-frequency heating coil 401 and the medium-frequency heating coil 402 are distributed on two sides of the meshing position of the driving gear 10 and the gear 11 to be measured, and the first driving assembly and the second driving assembly are respectively used for driving the medium-frequency heating coil 402 and the high-frequency heating coil 401 to move to heat the tooth profile of the gear 11 to be measured.
As a preferred embodiment, the first driving assembly and the second driving assembly have the same structure, each driving assembly is composed of a servo motor 406, a lead screw 405, a moving table 404 and a hydraulic cylinder 403, the servo motors 406 on two sides are respectively fixedly connected with the upper surfaces of two side plates of the rack 12, the output shaft of the servo motor 406 is connected with the upper end of the lead screw 405, the lower end of the lead screw 405 is connected with the lower end surface of the side plate of the rack 12 through a bearing, the moving table 404 is connected on the lead screw 405 and forms a screw pair with the lead screw 405, the side edge of the moving table 404 forms a sliding pair with the side plate of the rack 12, and the moving table 404 is driven to move up and down through the rotation of the lead screw 405;
the hydraulic cylinders 403 on two sides are respectively fixed on the mobile platforms 404 on two sides, and are respectively connected with the tail ends of the intermediate-frequency heating coil 402 and the high-frequency heating coil 401 to respectively drive the intermediate-frequency heating coil 402 and the high-frequency heating coil 401 to perform radial feeding motion; coil adjusting means of the intermediate frequency heating coil 402 is the same as that of the high frequency heating coil 401, and is connected to the intermediate frequency induction heating power supply 6 and the high frequency induction heating power supply 13, respectively. Through adopting high frequency induction heating and intermediate frequency induction heating to combine together, independently adjust both, it is even to realize gear profile temperature, and then realizes the durability experiment of gear under the high temperature condition for the experimental environment of gear more is close actual operating environment.
In a preferred embodiment, the torque applying assembly 14 is provided with a plurality of components, including an inertia rotor 143, a torque block 142, an electromagnetic clutch 141 and a tray, the tray is fixed on the frame 12, the inertia rotor 143 is placed in the tray, the torque block 142 is placed in a groove of the inertia rotor 143, an inner hole surface of the inertia rotor 143 is connected with an outer side of the electromagnetic clutch 141, and an inner side of the electromagnetic clutch 141 is connected with an outer surface of the transmission shaft 8; after the electromagnetic clutch 141 is unlocked, the inertia rotor 143 is in contact friction with the rough surface of the tray through a roller 144 arranged at the lower end, so that the inertia rotor 143 is freely braked;
the number of inertia rotors 143 applied to the transmission shaft 8 is increased in sequence in a gradient manner, so that the heavy load applied to the gear 11 to be tested is changed, multiple times of load change of one-time test of the gear 11 to be tested under the heavy load condition is realized, and the problem that the load cannot be changed in the durability test process can be solved.
The invention also provides a process method of the gear durability experimental device, which comprises the following steps:
s1: carrying out no-load transmission quality inspection on the gear 11 to be tested, and setting the average value of the vibration amplitude of the gear 11 to be tested as a vibration calibration parameter M 0 Setting a Torque parameter M 1 、M 2 、M 3 Failure time parameter T, experimental preset temperature T of input gear tooth profile, tooth crest allowable temperature difference [ T [ ] 1 ]Allowable temperature difference at tooth bottom [ T ] 2 ]Load M, high frequency heating coil 401 pitch addendum X 1 Intermediate frequency heating coil 402 from tooth bottom X 2 Unit distance of movement X 0 Destruction time threshold t 0 ；
S2: temperature loading: the computer 3 controls the servo motor 406 and the hydraulic cylinder 403 to move the high-frequency heating coil 401 to a distance X from the addendum X of the gear 11 to be measured 1 The intermediate-frequency heating coil 402 moves to the distance X from the tooth bottom of the gear 11 to be measured 2 Simultaneously connecting a high-frequency induction heating power supply and a medium-frequency induction heating power supply, heating the tooth profile of the gear 11 to be measured, and measuring and calculating the tooth crest temperature T of the gear 11 to be measured by the infrared thermometer 5 1 Tooth bottom temperature T 2 If | T 1 -T|≤[T 1 ]Then the position of the high-frequency heating coil 401 is kept unchanged, otherwise when T 1 when-T > 0, the high-frequency heating coil 401 is moved outward by a unit distance X 0 When T is 1 when-T < 0, the high-frequency heating coil 401 is moved inward by a unit distance X 0 Up to | T 1 -T|≤[T 1 ]If | T-T 2 |≤[T 2 ]Then the position of the mid-frequency heating coil 402 is maintained, otherwise when T-T 2 When > 0, the intermediate frequency heating coil 402 moves inward by a unit distance X 0 When T-T 2 When < 0, the intermediate frequency heating coil 402 moves outward by a unit distance X 0 Up to | T-T 2 |≤[T 2 ]；
S3: stress loading: torque parameter M 1 Corresponds to n 1 An inertia rotor 143, a torque parameter M 2 Corresponds to n 2 An inertia rotor 143, a torque parameter M 3 Corresponds to n 3 After the temperature of the tooth profile of the gear 11 to be measured is uniform, the computer 3 controls the electromagnetic clutch 141 to drive the inertial rotor 143 to rotaten 1 An inertia rotor 143 is applied to the drive shaft 8, and n is controlled if the applied torque is changed 2 An inertia rotor 143, n 3 The inertia rotors 143 are sequentially applied to the transmission shaft 8, so that the gear 11 to be tested is in different heavy load environments;
s4: judging the failure of the gear and stopping the test: amplitude M is measured by vibration sensor 2 max And M min A time-varying torque curve is measured and calculated by the torque sensor 1; if it is
When the curve of the torque changing along with the time does not have a sudden drop, the test is continued until M is more than M 0 (ii) a If M > M 0 ，t＞t 0 If the torque curve suddenly drops along with the time, the failure of the sample of the gear 11 to be tested is judged, the computer 3 immediately controls the electromagnetic clutch 141 to enable the inertia rotor 143 to be completely separated from the transmission shaft 8, the inertia rotor 143 stops by free friction of a rotating wheel at the bottom, and the test stops; if M > M 0 ，t≤t 0 If the curve of the torque changing along with the time does not have a sudden drop, continuing the test until M is more than M 0 ，t＞t 0 。
In a preferred embodiment, in step S1, the method for checking the unloaded transmission quality of the gear 11 to be tested includes: fixing the gear 11 to be tested on an experimental device, idling at a speed of 400r/m under the condition of not setting a load, observing the vibration condition of the experimental device, and re-installing the gear 11 to be tested if the unqualified countershaft condition occurs until the countershaft is qualified.
Example 1
As shown in fig. 1 and 2, a gear durability test device for performing a variable load durability test on a gear to be tested under a high temperature and heavy load comprises a frame 12, a driving gear 10, an electromagnetic brake valve 7, a transmission shaft 8, an infrared thermometer 5, a torque sensor 1, a vibration sensor 2, an induction heating assembly 4 and a torque applying assembly 14. The electromagnetic brake valve 7 is fixedly connected with the upper end face of the top plate of the rack 12, and when the electromagnetic brake valve is not in operation, a friction plate of the electromagnetic brake valve 7 is in clearance fit with a rough surface at the upper end of the transmission shaft 8, so that emergency braking in an experimental process can be realized. The transmission shaft 8 is connected with a thrust bearing 15 and a flange shaft sleeve 16 and positioned at the middle end of a middle plate in the rack 12, the transmission shaft 8 is connected with the gear 11 to be tested through keys, and the thrust bearing 15, the flange shaft sleeve 16 and the shaft sleeve 17 are used for positioning the gear 11 to be tested together. Both sides of the gear 11 and the driving gear 10 meshing department that awaits measuring on the transmission shaft 8 are equipped with induction heating assembly 4, the gear 11 and the driving gear 10 meshing transmission that awaits measuring on the transmission shaft 8, driving gear 10 is connected with motor 9's output, motor 9 is connected with frame 12 backplate, subassembly 14 is applyed with the moment of torsion to the well lower extreme of transmission shaft 8, the lower extreme and the torque sensor 1 of transmission shaft 8 pass through the coupling joint, torque sensor 1 plays the positioning action to transmission shaft 8, infrared thermometer 5 is connected with the lower terminal surface of frame 12 roof, vibration sensor 2 is equipped with two, the symmetry is located the both sides of frame 12, vibration sensor and driving gear all are located the frame middle-end. This embodiment carries out the rigidity of gear that awaits measuring through the rigidity and the location of traditional axle, and when the transmission shaft is longer, the operation inevitable slightly rocks when appearing, consequently, the transmission shaft passes through footstep bearing 15, flange axle sleeve 16, axle sleeve 17 when fixing a position to can fix a position the gear that awaits measuring, reduce the gear that awaits measuring and rock, consequently fixed gear that awaits measuring can reduce as far as possible and disturb and rock.
In this embodiment, the infrared thermometer 5 may employ an MLX90614 non-contact infrared thermometry sensor.
In this embodiment, the vibration sensor 2 may be an M332088 vibration sensor calibrator, model number: ZH 62-JX-3B. The vibration sensor is used for measuring vibration generated by the gear to be measured, particularly, after the gear to be measured is damaged, slight vibration can be generated along with meshing transmission of the two gears in the experimental process, the vibration sensor only needs to be installed on the rack, vibration generated by the failure of the gear can be transmitted to the rack, and when the rack vibrates, the vibration sensor can measure and calculate the vibration amplitude of the gear to be measured.
In this embodiment, the torque sensor 1 may be a rotary torque sensor, and the model is: BW 42-CYB-803S. The torque sensor is used for directly measuring the torque of the transmission shaft in the experimental process, and the torque of the torque applying component is set in advance.
In this embodiment, as shown in fig. 3, two sets of induction heating assemblies 4 are provided, which are respectively located at the left and right sides of the meshing position of the driving gear and the gear to be measured, each set of induction heating assembly 4 includes a servo motor, a lead screw, a moving platform, a hydraulic cylinder, and an induction heating coil, the induction heating coils in the left and right induction heating assemblies 4 are respectively a medium frequency heating coil 402 and a high frequency heating coil 401, the servo motors 406 at the two sides are respectively and fixedly connected with the upper surfaces of the two side plates of the rack 12, the output shaft of each servo motor 406 is connected with the upper end of the lead screw 405, the lower end of the lead screw 405 is connected with the lower end surface of the side plate of the rack 12, the lead screw 405 and the moving platform 404 form a screw pair, the moving platform 404 can be driven to perform vertical linear motion, the moving platform 404 and the rack 12 form a sliding pair, the moving platform 404 is fixedly connected with the hydraulic cylinder 403, the two hydraulic cylinders 403 are respectively connected with the tail ends of the high frequency heating coils 401/medium frequency heating coils 402, the induction heating coils can be driven to perform radial feeding movement respectively, the coil adjusting device of the medium-frequency heating coil 402 is the same as the high-frequency heating coil 401, and the high-frequency heating coil 401 and the medium-frequency heating coil 402 are symmetrically distributed on two sides of the meshing position 11 of the driving gear 10 and the gear to be detected and are connected with the medium-frequency induction heating power supply 6 and the high-frequency induction heating power supply 13 respectively.
In this embodiment, as shown in fig. 4 and 5, the torque application assembly 14 is located at the lower end of the housing, and includes an inertia rotor, a torque block, an electromagnetic clutch, and a tray fixed to the housing, the inertia rotor 143 is placed in the tray, the torque block 142 is placed in the groove of the inertia rotor 143, the inner diameter surface of the inner bore of the inertia rotor 143 is connected to the outer side of the electromagnetic clutch 141, and the inner side of the electromagnetic clutch 141 is connected to the outer surface of the transmission shaft 8. After the electromagnetic clutch 141 is unlocked, the inertia rotor 143 is in contact with the rough surface via the roller 144 provided at the lower end thereof to be rubbed, thereby achieving free braking of the inertia rotor. The electromagnetic clutch 141 is a dry single-disc electromagnetic clutch.
In this embodiment, the electromagnetic clutch 141 may be of the inner bearing type electromagnetic clutch TJ-a2 type.
In the embodiment of the present invention, based on the gear durability test apparatus provided by the present invention, the present invention further provides a variable load gear durability process method using the gear durability test apparatus, as shown in fig. 7, the method includes the following steps:
in the embodiment, the gear 11 to be tested is fixed on a test bench, idling is carried out at a speed of 400r/m under the condition that no load is set, the vibration condition of the test bench is observed, and if the unqualified countershaft condition occurs, the gear to be tested needs to be installed again until the gear to be tested is qualified; if the axis is qualified, as shown in FIG. 7, the average value of the vibration amplitude is set as the vibration calibration parameter M 0 Setting a Torque parameter M 1 、M 2 、M 3 Failure time parameter T, experimental preset temperature parameter T of input gear tooth profile, and tooth top allowable temperature difference parameter [ T 1 ]Allowable tooth bottom temperature difference parameter [ T ] 2 ]Load parameter M, high-frequency heating coil pitch crest parameter X as shown in FIG. 6 1 Pitch parameter X of intermediate frequency heating coil 2 Parameter X of unit moving distance 0 Destruction time threshold parameter t 0 。
In this example, temperature loading was performed: the computer 3 controls the servo motor 406 and the hydraulic cylinder 403 to enable the high-frequency heating coil 401 to move to a distance X from the addendum X of the gear to be measured 1 The intermediate frequency heating coil 402 moves to the gear bottom X to be measured 2 Simultaneously connecting a high-frequency induction heating power supply 13 and an intermediate-frequency induction heating power supply 6 to heat the tooth profile of the gear 11 to be measured, and measuring and calculating the tooth crest temperature T of the gear 11 to be measured by using an infrared thermometer 5 1 Tooth bottom temperature T 2 If | T 1 -T|≤[T 1 ]The position of the high-frequency heating coil 401 is kept unchanged, otherwise when T 1 when-T > 0, the high-frequency heating coil 401 is moved outward by a unit distance X 0 When T is 1 when-T < 0, the high-frequency heating coil 401 is moved inward by a unit distance X 0 Up to | T 1 -T|≤[T 1 ]If | T-T 2 |≤[T 2 ]Then the position of the mid-frequency heating coil 402 is maintained, otherwise when T-T 2 When > 0, the intermediate frequency heating coil 402 moves inward by a unit distance X 0 When T-T 2 When the current is less than 0, the intermediate frequency heating coil 402 moves outward by a unit distanceFrom X 0 Up to | T-T 2 |≤[T 2 ]。
In this example, stress loading was performed: the computer 3 calculates a torque parameter M 1 Corresponds to n 1 An inertia rotor 143, a torque parameter M 2 Corresponds to n 2 An inertia rotor 143, a torque parameter M 3 Corresponds to n 3 After the temperature of the tooth profile of the gear 11 to be measured is uniform, the computer 3 controls the electromagnetic clutch 141 to enable n to be measured 1 When the inertia rotor 143 is applied to the transmission shaft 8 and the rotation speed of the transmission shaft 8 is stabilized, the computer 3 controls the electromagnetic clutch 141 to change the applied torque 2 An inertia rotor 143, n 3 The inertial rotors 143 are in turn applied to the drive shaft 8.
In this embodiment, gear failure determination and test stop are performed: the vibration sensor 2 measures the amplitude M max 、M min And the torque sensor 1 measures and calculates the time-varying curve of the torque, if M is less than or equal to M 0 (wherein
) When the curve of the torque changing along with the time does not have a sudden drop, the test is continued until M is more than M 0 (ii) a If M > M 0 ，t＞t 0 If the torque curve changes suddenly along with the time, the sample is judged to be invalid, the computer 3 immediately controls the electromagnetic clutch 141 to enable the inertia rotor 143 to be completely separated from the transmission shaft 8, the inertia rotor 143 is free to rub and stop by the rotating wheel 144 at the bottom, and the test is stopped; if M > M 0 ，t≤t 0 If the curve of the torque changing along with the time does not have a sudden drop, continuing the test until M is more than M 0 ，t＞t 0 。
Example 2
In this embodiment, based on the experimental apparatus for durability of a gear provided by the present invention, the present invention further provides a method for testing durability of a gear under constant load using the experimental apparatus for durability of a gear, as shown in fig. 6, the method includes the following steps:
in this embodiment, the gear 11 to be measured is fixed on a test table, and under the condition of not setting a load, the method is adoptedIdling is carried out at the speed of 400r/m, the vibration condition of the test bed is observed, and if the unqualified counter shaft condition occurs, the gear to be tested needs to be installed again until the gear is qualified; if the pair of shafts is qualified, setting the average value of the vibration amplitude as a vibration calibration parameter M 0 Setting a torque parameter M 1 、M 2 、M 3 Failure time parameter T, experimental preset temperature parameter T of input gear tooth profile, and tooth top allowable temperature difference parameter [ T 1 ]Allowable tooth bottom temperature difference parameter [ T ] 2 ]Load parameter M, high-frequency heating coil pitch crest parameter X as shown in FIG. 7 1 Pitch parameter X of intermediate frequency heating coil 2 Unit distance of movement parameter X 0 Destruction time threshold parameter t 0 。
In this example, temperature loading: the computer 3 controls the servo motor 406 and the hydraulic cylinder 403 to enable the high-frequency heating coil 401 to move to a distance X from the addendum X of the gear to be measured 1 The intermediate frequency heating coil 402 moves to a distance X from the gear bottom X to be measured 2 Simultaneously connecting a high-frequency induction heating power supply 13 and an intermediate-frequency induction heating power supply 6 to heat the tooth profile of the gear 11 to be measured, and measuring and calculating the tooth crest temperature T of the gear 11 to be measured by using an infrared thermometer 5 1 Tooth bottom temperature T 2 If | T 1 -T|≤[T 1 ]The position of the high-frequency heating coil 401 is kept unchanged, otherwise when T 1 when-T > 0, the high-frequency heating coil 401 is moved outward by a unit distance X 0 When T is 1 when-T < 0, the high-frequency heating coil 401 is moved inward by a unit distance X 0 Up to | T 1 -T|≤[T 1 ]If | T-T 2 |≤[T 2 ]Then the position of the mid-frequency heating coil 402 is maintained, otherwise when T-T 2 When the distance is more than 0, the intermediate-frequency heating coil 402 moves inward by a unit distance X 0 When T-T 2 When the temperature is less than 0, the intermediate frequency heating coil 402 moves outwards by a unit distance X 0 Up to | T-T 2 |≤[T 2 ]。
In this embodiment, the stress loading is: the computer 3 calculates a torque parameter M 1 Corresponds to n 1 After the temperature of the tooth profile of the gear 11 to be measured is uniform, the computer 3 controls the electromagnetic clutch 141 to drive n 1 An inertia rotor 143 are applied to the drive shaft 8.
In this embodiment, the gear failure determination and test stops: the vibration sensor 2 calculates the amplitude M max 、M min And the torque sensor 1 measures and calculates the time-varying curve of the torque, if M is less than or equal to M 0 (wherein
) When the curve of the torque changing along with the time does not have a sudden drop, the test is continued until M is more than M 0 (ii) a If M > M 0 ，t＞t 0 If the torque curve changes suddenly along with the time, the sample is judged to be invalid, the computer 3 immediately controls the electromagnetic clutch 141 to enable the inertia rotor 143 to be completely separated from the transmission shaft 8, the inertia rotor 143 is free to rub and stop by the rotating wheel 144 at the bottom, and the test is stopped; if M > M 0 ，t≤t 0 If the curve of the torque variation with time does not show a sudden drop, the test is continued until M is more than M 0 ，t＞t 0 。
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (5)
1. A gear durability test device, characterized by comprising: the device comprises a computer (3), a rack (12), a transmission shaft (8) connected with the rack (12), a driving gear (10), a motor (9) connected with the computer (3), an infrared thermometer (5), a torque sensor (1), a vibration sensor (2), two groups of induction heating assemblies (4) and a torque applying assembly (14), wherein a gear (11) to be tested is installed on the transmission shaft (8) and is in meshed connection with the driving gear (10), and the motor (9) is installed on the rack (12) and is connected with the driving gear (10) and used for driving the driving gear (10) and the gear (11) to be tested to rotate in a meshed mode;
the two groups of induction heating assemblies (4) are arranged on the rack (12), are respectively positioned on two sides of the meshing position of the driving gear (10) and the gear (11) to be measured and are used for heating the gear (11) to be measured; the torque applying assembly (14) is arranged on the rack (12), is connected with the middle lower end of the transmission shaft (8) and is used for realizing that the gear (11) to be tested is in different heavy load environments; the combination of the two groups of induction heating assemblies (4) and the torque applying assembly (14) is used for carrying out a variable load durability test on the gear (11) to be tested under high temperature and heavy load; the infrared thermometer (5) is arranged on the rack (12) and is used for detecting the temperature of the heated tooth profile of the gear (11) to be detected;
the torque sensor (1) is connected with the bottom end of the transmission shaft (8) through a coupler and is used for measuring and calculating the torque of the transmission shaft (8) in the experiment process; the two vibration sensors (2) are symmetrically arranged on two sides of the rack (12) and used for measuring and calculating the amplitude generated by the gear (11) to be measured in the experiment process; judging whether the gear (11) to be tested fails or not through the torque sensor (1) and the vibration sensor (2);
the two groups of induction heating assemblies (4) are respectively an intermediate frequency heating assembly and a high frequency heating assembly, the intermediate frequency heating assembly consists of a first driving assembly and an intermediate frequency heating coil (402) connected with the first driving assembly, the high frequency heating assembly consists of a second driving assembly and a high frequency heating coil (401) connected with the second driving assembly, the high frequency heating coil (401) and the intermediate frequency heating coil (402) are distributed on two sides of the meshing position of the driving gear (10) and the gear (11) to be tested, and the first driving assembly and the second driving assembly are respectively used for driving the intermediate frequency heating coil (402) and the high frequency heating coil (401) to move to heat the tooth profile of the gear (11) to be tested;
the structure of the first driving assembly is the same as that of the second driving assembly, each driving assembly consists of a servo motor (406), a lead screw (405), a moving platform (404) and a hydraulic cylinder (403), the servo motors (406) on two sides are fixedly connected with the upper surfaces of two side plates of the rack (12) respectively, an output shaft of the servo motor (406) is connected with the upper end of the lead screw (405), the lower end of the lead screw (405) is connected with the lower end surface of a side plate of the rack (12) through a bearing, the moving platform (404) is connected to the lead screw (405) and forms a screw pair with the lead screw (405), the side edge of the moving platform (404) forms a sliding pair with the side plate of the rack (12), and the moving platform (404) is driven to move up and down through the rotation of the lead screw (405);
the hydraulic cylinders (403) on the two sides are respectively fixed on the mobile platforms (404) on the two sides and respectively connected with the tail ends of the medium-frequency heating coil (402) and the high-frequency heating coil (401) to respectively drive the medium-frequency heating coil (402) and the high-frequency heating coil (401) to perform radial feeding motion; the coil adjusting device of the intermediate frequency heating coil (402) is the same as the high frequency heating coil (401), and is respectively connected with the intermediate frequency induction heating power supply (6) and the high frequency induction heating power supply (13);
the torque applying assemblies (14) are multiple and comprise inertia rotors (143), torque blocks (142), electromagnetic clutches (141) and trays, the trays are fixed on the rack (12), the inertia rotors (143) are arranged in the trays, the torque blocks (142) are arranged in grooves of the inertia rotors (143), the inner hole surfaces of the inertia rotors (143) are connected with the outer sides of the electromagnetic clutches (141), and the inner sides of the electromagnetic clutches (141) are connected with the outer surfaces of the transmission shafts (8); after the electromagnetic clutch (141) is unlocked, the inertia rotor (143) is in contact friction with the rough surface of the tray through a roller (144) arranged at the lower end of the inertia rotor (143), so that the inertia rotor (143) is freely braked;
the number of inertia rotors (143) applied to the transmission shaft (8) is increased in a gradient mode in sequence, so that the heavy load applied to the gear (11) to be tested is changed, and multiple times of variable load of one-time experiment of the gear (11) to be tested under the heavy load condition are achieved.
2. The gear durability test device according to claim 1, wherein the upper part of the transmission shaft (8) is connected with a top plate of the rack (12) through a bearing, the upper end penetrating out of the rack (12) is connected with an electromagnetic brake valve (7), and the electromagnetic brake valve (7) is fixedly connected with the upper end face of the top plate of the rack (12) to realize emergency braking in the test process.
3. The experimental device for the durability of the gears is characterized in that the transmission shaft (8) is connected with the middle plate of the rack (12) through a thrust bearing (15), the transmission shaft (8) is also connected with a flange shaft sleeve (16) and a shaft sleeve (17), the flange shaft sleeve (16) is fixed on the lower end surface of the middle plate of the rack (12) through a bolt, one side of the shaft sleeve (17) is in contact connection with the bottom end of the flange shaft sleeve (16), and the other side of the shaft sleeve (17) is in contact connection with the top of the torque application component (14); the transmission shaft (8) positions the gear (11) to be measured through the thrust bearing (15) and the shaft sleeve (17).
4. A process method of the gear durability test apparatus according to any one of claims 1 to 3, comprising the steps of:
s1: carrying out no-load transmission quality inspection on the gear (11) to be tested, and setting the average value of the vibration amplitude of the gear (11) to be tested as a vibration calibration parameter M 0 Setting a torque parameter M 1 、M 2 、M 3 The failure time parameter T, the experimental preset temperature T of the input gear tooth profile, the allowable temperature difference of the tooth top, the allowable temperature difference of the tooth bottom, the load M and the distance between the high-frequency heating coil (401) and the tooth top X 1 Medium frequency heating coil (402) pitch X 2 Unit distance of movement X 0 Destruction time threshold t 0 ；
S2: temperature loading: the computer (3) controls the servo motor (406) and the hydraulic cylinder (403) to enable the high-frequency heating coil (401) to move to a position which is far from the addendum X of the gear (11) to be measured 1 The intermediate frequency heating coil (402) moves to a distance X from the tooth bottom of the gear (11) to be measured 2 Meanwhile, a high-frequency induction heating power supply and a medium-frequency induction heating power supply are switched on to heat the tooth profile of the gear (11) to be measured, and the tooth top temperature T of the gear (11) to be measured is measured and calculated by an infrared thermometer (5) 1 Tooth bottom temperature T 2 If | T 1 -T ≦ permissible addendum temperature difference, keeping the position of the high-frequency heating coil (401) unchanged, otherwise when T is less than or equal to T 1 -T > 0, the high-frequency heating coil (401) is moved outward by a unit distance X 0 When T is 1 -T < 0, the high-frequency heating coil (401) is moved inward by a unit distance X 0 Up to | T 1 Allowable tooth tip temperature difference of-T |, if T-T | 2 If the allowable temperature difference of | ≦ tooth bottom, the position of the intermediate frequency heating coil (402) is kept unchanged, otherwise, when T-T is used 2 When the temperature is more than 0, the intermediate frequency heating coil (402) moves inwards by a unit distance X 0 When T-T 2 When less than 0, the intermediate frequency heating coil (402) moves outward by a unit distance X 0 Up to|T-T 2 Allowable temperature difference of tooth bottom is less than or equal to | the allowable temperature difference;
s3: stress loading: torque parameter M 1 Corresponds to n 1 An inertia rotor (143), a torque parameter M 2 Corresponds to n 2 An inertia rotor (143), a torque parameter M 3 Corresponds to n 3 After the temperature of the tooth profile of the gear (11) to be measured is uniform, the computer (3) controls the electromagnetic clutch (141) to enable n to be measured 1 An inertia rotor (143) is applied to the drive shaft (8), and n is controlled if the applied torque is changed 2 An inertia rotor (143), n 3 The inertia rotors (143) are sequentially applied to the transmission shaft (8) to enable the gear (11) to be tested to be in different heavy-load environments;
s4: judging the failure of the gear and stopping the test: the amplitude M is measured by the vibration sensor (2) max And M min Measuring and calculating a time-varying torque curve through a torque sensor (1); if it is
When the curve of the torque changing along with the time does not drop suddenly, the test is continued until M is larger than M 0 (ii) a If M > M 0 ，t＞t 0 If the torque suddenly drops along a time variation curve, judging that the sample of the gear (11) to be tested fails, immediately controlling the electromagnetic clutch (141) by the computer (3) to enable the inertia rotor (143) to be completely separated from the transmission shaft (8), enabling the inertia rotor (143) to stop by free friction of a rotating wheel at the bottom, and stopping the test; if M > M 0 ，t≤t 0 If the curve of the torque changing along with the time does not have a sudden drop, continuing the test until M is more than M 0 ，t＞t 0 。
5. The process of the gear durability test device according to claim 4, wherein in the step S1, the method for checking the no-load transmission quality of the gear (11) to be tested comprises the following steps: fixing the gear (11) to be tested on an experimental device, idling at a speed of 400r/m under the condition of not setting a load, observing the vibration condition of the experimental device, and if the condition of unqualified shaft alignment occurs, reinstalling the gear (11) to be tested until the shaft alignment is qualified.
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Effective date of registration: 20240527 Address after: 230000 b-1018, Woye Garden commercial office building, 81 Ganquan Road, Shushan District, Hefei City, Anhui Province Patentee after: HEFEI WISDOM DRAGON MACHINERY DESIGN Co.,Ltd. Country or region after: China Address before: 066004 No. 438 west section of Hebei Avenue, seaport District, Hebei, Qinhuangdao Patentee before: Yanshan University Country or region before: China |