CN111174998B - Running-in test bed of rotary tillage machine - Google Patents
Running-in test bed of rotary tillage machine Download PDFInfo
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- CN111174998B CN111174998B CN202010084426.5A CN202010084426A CN111174998B CN 111174998 B CN111174998 B CN 111174998B CN 202010084426 A CN202010084426 A CN 202010084426A CN 111174998 B CN111174998 B CN 111174998B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/022—Vibration control arrangements, e.g. for generating random vibrations
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/025—Measuring arrangements
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Abstract
The invention belongs to the technical field of rotary tillage machinery, and particularly relates to a running-in test bed of rotary tillage machinery, which aims at the problems that the existing test bed is frequently displayed by a sensor, the equipment cost is high, meanwhile, too many electronic devices are easy to damage, the production cost is increased, and the use requirement cannot be met. The invention has reasonable structure, can test the shake at different speeds, can quickly fix the rotary tillage machine, improves the working efficiency, avoids using a sensor, saves the production cost and meets the use requirement.
Description
Technical Field
The invention relates to the technical field of rotary tillage machinery, in particular to a running-in test bed of rotary tillage machinery.
Background
The rotary cultivator is a cultivator which is matched with a tractor to complete the operations of ploughing and harrowing. The soil breaking machine has the characteristics of strong soil breaking capacity, flat ground surface after ploughing and the like, so that the soil breaking machine is widely applied; meanwhile, the stubble buried below the ground surface can be cut up, the operation of the seeder is convenient, and a good seedbed is provided for later-stage seeding.
The rotary tillage cutter shaft is divided into a horizontal shaft type, a vertical shaft type and an inclined type according to the configuration mode of the rotary tillage cutter shaft. The correct use and adjustment of the rotary tiller is important to maintain its good technical state and to ensure the quality of cultivation.
The rotary cultivator needs to carry out the shake test in process of production, but the test bench that exists now passes through the sensor display more, and equipment cost is higher, and electron device is too much simultaneously, causes the damage easily, improves manufacturing cost, has not satisfied the demand of using.
Disclosure of Invention
The invention aims to solve the problems that the existing test bed is displayed by a sensor more frequently, the equipment cost is higher, and meanwhile, the electronic devices are too many, so that the damage is easily caused, the production cost is increased, and the use requirement cannot be met.
In order to achieve the purpose, the invention adopts the following technical scheme:
a running-in test bed for rotary tillage machinery comprises a test bed body, wherein a fixed seat is arranged at the top end of the test bed body, a mounting seat is movably arranged on one side, away from the test bed body, of the fixed seat, a rotating motor is connected to one side of the mounting seat, a through groove is formed in the mounting seat, a full-thread stud is arranged in the through groove and extends out of the mounting seat, a turntable is arranged on one side, away from the fixed seat, of the full-thread stud, a threaded concave hole is formed in one side, close to the mounting seat, of the fixed seat, the full-thread stud is movably arranged in the threaded concave hole and is matched with the threaded concave hole, a rotating shaft is connected to one side, away from the mounting seat, of the rotating motor through an output shaft, a driving gear is sleeved on the rotating shaft, a connecting piece is arranged on one side of the fixed seat, and the bottom end of the connecting piece is fixed on the test bed body, the top of connecting piece is equipped with the mounting, the mounting internalization is equipped with first pivot, and outside first pivot extended to the mounting, first pivot was hollow structure, first pivot internalization was equipped with the second pivot, and outside the second pivot extended to first pivot, the one end that the second pivot extended to outside the first pivot was connected with driven gear, and driven gear and driving gear meshing, fixing hole has been seted up in the first pivot, and has seted up fixed recess in the second pivot, be equipped with reset spring on the inner wall of fixed recess, and reset spring's top is connected with the card post, the card post activity is located in the fixing hole, one side that the fixing base was kept away from to the connecting piece is equipped with vibrating spring, and vibrating spring's quantity is two, vibrating spring symmetry is located on the test bench body.
Preferably, the top end of the vibration spring is provided with the same fixed table, the top end of the fixed table is provided with a first baffle plate and a second baffle plate, the second baffle is arranged on one side of the first baffle, the second baffle is movably arranged on a fixed platform, the fixed platform is of a hollow structure, the bottom end of the inner wall of the fixed platform is provided with a mounting piece, the top end of the mounting piece is provided with a moving piece, a screw rod is movably arranged in the movable part and extends out of the fixed platform, a crank is connected with one end of the screw rod extending out of the fixed platform, a movable groove is arranged on the screw rod, a sliding block is movably arranged in the movable groove and extends out of the screw rod, the top end of the sliding block is connected with a fixed column, a movable groove is arranged on the fixed table, and the fixed column extends to the outside of the fixed station through the movable groove, and the one end that the fixed column extends to the outside of the fixed station is located on the second baffle.
Preferably, a first through hole is formed in one side of the fixing table, the screw rod extends out of the fixing table through the first through hole, the screw rod is movably arranged in the first through hole, the crank is sleeved with an anti-skidding sleeve, and the anti-skidding sleeve is made of silica gel materials.
Preferably, one side of the fixed station is provided with an installation column, one side of the installation column, which is far away from the fixed station, is provided with an indication flag, and the indication flag is made of non-woven fabrics.
Preferably, the bottom symmetry of test bench body is equipped with the lower margin, the lower margin is extending structure, and one side that the test bench body was kept away from to the lower margin is equipped with the slipmat.
Preferably, the driven gear comprises a first gear, a second gear, a third gear and a fourth gear, the second gear is arranged on one side of the first gear, the third gear is arranged on one side, away from the first gear, of the second gear, the fourth gear is arranged on one side, away from the second gear, of the third gear, the first gear, the second gear, the third gear and the fourth gear are all sleeved on the second rotating shaft, and the radius ratio of the first gear to the second gear to the third gear to the fourth gear is 1:2:4: 8.
Preferably, the number of screw thread shrinkage pool is four, and equidistant seting up on the fixing base, fixing hole's quantity is four, and equidistant seting up in first pivot.
Preferably, a second through hole is formed in one side of the first rotating shaft, the second rotating shaft extends out of the first rotating shaft through the second through hole, and the second rotating shaft is movably arranged in the second through hole.
Preferably, the fixing member is provided with a first through hole, first bearings are symmetrically embedded in the first through hole, and the first rotating shaft is movably arranged in the first bearings.
Preferably, the moving part is provided with a second through hole, a second bearing is symmetrically embedded in the second through hole, and the screw rod is movably arranged in the second bearing.
According to the rotary cultivator, the driven gear is added, the first gear, the second gear, the third gear and the fourth gear are meshed with the driving gear in different radius ratios, so that the second rotating shaft is different in rotating speed, the first rotating shaft is driven to rotate through the clamping column by the second rotating shaft, the first rotating shaft is different in rotating speed, and different rotating speeds of the rotary cultivator are tested;
by adding the fixed table, the crank is utilized to drive the screw rod to rotate, the screw rod drives the sliding block to move through the movable groove, and the sliding block drives the second baffle to move in the movable groove, so that the rotary tillage machine can be quickly fixed on the fixed table, and the test is convenient;
by adding the vibrating spring, the rotary tillage machine shakes on the vibrating fixed table, and the shaking amplitude can be clearly observed through the indicating flag, so that the need of a sensor is avoided, the service life is prolonged, and the production cost is saved;
the invention has reasonable structure, can test the shake at different speeds, can quickly fix the rotary tillage machine, improves the working efficiency, avoids using a sensor, saves the production cost and meets the use requirement.
Drawings
FIG. 1 is a schematic structural view of a running-in test bed of a rotary tillage machine according to the present invention;
FIG. 2 is a schematic view of a top view of a fixing base of a running-in test bed of a rotary tillage machine according to the present invention;
FIG. 3 is a schematic view of an internal structure of a first rotating shaft of a running-in test bed of a rotary tillage machine according to the present invention;
FIG. 4 is a schematic view of a driven gear structure of a running-in test bed of a rotary tillage machine according to the present invention;
FIG. 5 is a schematic structural view of a fixing stand of a running-in test stand of a rotary tillage machine according to the present invention;
FIG. 6 is a schematic view of an internal structure of a fixing table of a running-in test bed of a rotary tillage machine according to the present invention.
In the figure: the test bed comprises a test bed body 1, a fixed seat 2, a mounting seat 3, a rotating motor 4, a penetrating groove 5, a full-thread stud 6, a rotary table 7, a thread concave hole 8, a rotating shaft 9, a driving gear 10, a connecting piece 11, a fixing piece 12, a first rotating shaft 13, a second rotating shaft 14, a driven gear 15, a first gear 151, a second gear 152, a third gear 153, a fourth gear 154, a fixing through hole 16, a fixing groove 17, a return spring 18, a clamping column 19, a vibrating spring 20, a fixing table 21, a first baffle 22, a second baffle 23, a mounting piece 24, a moving piece 25, a screw rod 26, a crank 27, a sliding block 28, a fixed column 29, a movable groove 30, a foot 31 and an indicating flag 32.
Detailed Description
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.
Referring to fig. 1-6, a running-in test bed for rotary tillage machinery comprises a test bed body 1, a fixed seat 2 is arranged at the top end of the test bed body 1, a mounting seat 3 is movably arranged at one side of the fixed seat 2 away from the test bed body 1, a rotating motor 4 is connected with one side of the mounting seat 3, a through groove 5 is arranged on the mounting seat 3, a full-thread stud 6 is arranged in the through groove 5, the full-thread stud 6 extends out of the mounting seat 3, a turntable 7 is arranged at one side of the full-thread stud 6 away from the fixed seat 2, a threaded concave hole 8 is arranged at one side of the fixed seat 2 close to the mounting seat 3, the full-thread stud 6 is movably arranged in the threaded concave hole 8, the full-thread stud 6 is matched with the threaded concave hole 8, a rotating shaft 9 is connected with one side of the rotating motor 4 away from the mounting seat 3 through an output shaft, a driving gear 10 is sleeved on the rotating shaft 9, a connecting piece 11 is arranged at one side of the fixed seat 2, the bottom end of the connecting piece 11 is fixed on the test bed body 1, the top end of the connecting piece 11 is provided with a fixing piece 12, a first rotating shaft 13 is movably arranged in the fixing piece 12, the first rotating shaft 13 extends out of the fixing piece 12, the first rotating shaft 13 is of a hollow structure, a second rotating shaft 14 is movably arranged in the first rotating shaft 13, the second rotating shaft 14 extends out of the first rotating shaft 13, one end of the second rotating shaft 14 extending out of the first rotating shaft 13 is connected with a driven gear 15, the driven gear 15 is meshed with a driving gear 10, a fixing through hole 16 is arranged on the first rotating shaft 13, a fixing groove 17 is arranged on the second rotating shaft 14, a return spring 18 is arranged on the inner wall of the fixing groove 17, the top end of the return spring 18 is connected with a clamping column 19, the clamping column 19 is movably arranged in the fixing through hole 16, one side of the connecting piece 11 far away from the fixing seat 2 is provided with a vibration spring 20, and the number of the vibration springs 20 is two, the vibration springs 20 are symmetrically arranged on the test bed body 1.
In the invention, the top end of the vibration spring 20 is provided with the same fixed platform 21, the top end of the fixed platform 21 is provided with a first baffle 22 and a second baffle 23, the second baffle 23 is arranged at one side of the first baffle 22, the second baffle 23 is movably arranged on the fixed platform 21, the fixed platform 21 is of a hollow structure, the bottom end of the inner wall of the fixed platform 21 is provided with a mounting part 24, the top end of the mounting part 24 is provided with a moving part 25, a screw rod 26 is movably arranged in the movable piece 25, the screw rod 26 extends out of the fixed platform 21, one end of the screw rod 26 extending out of the fixed platform 21 is connected with a crank 27, the screw rod 26 is provided with a movable groove, a slide block 28 is movably arranged in the movable groove, the slide block 28 extends out of the screw rod 26, the top end of the slide block 28 is connected with a fixed column 29, a movable groove 30 is arranged on the fixed platform 21, and the fixed column 29 extends to the outside of the fixed platform 21 through the movable groove 30, and one end of the fixed column 29 extending to the outside of the fixed platform 21 is arranged on the second baffle plate 23.
In the invention, one side of a fixed platform 21 is provided with a first through hole, a screw rod 26 extends out of the fixed platform 21 through the first through hole, the screw rod 26 is movably arranged in the first through hole, a crank 27 is sleeved with an anti-slip sleeve which is made of silica gel material, one side of the fixed platform 21 is provided with a mounting column, one side of the mounting column far away from the fixed platform 21 is provided with an indication flag 32, the indication flag 32 is made of non-woven fabric, the bottom end of a test platform body 1 is symmetrically provided with ground feet 31, the ground feet 31 are of a telescopic structure, one side of the ground feet 31 far away from the test platform body 1 is provided with an anti-slip pad, a driven gear 15 comprises a first gear 151, a second gear 152, a third gear 153 and a fourth gear 154, one side of the first gear 151 is provided with the second gear 152, one side of the second gear 152 far away from the first gear 151 is provided with the third gear 153, and one side of the third gear 153 far away from the second gear 152 is provided with the fourth gear 154, the first gear 151, the second gear 152, the third gear 153 and the fourth gear 154 are all sleeved on the second rotating shaft 14, the radius ratio of the first gear 151, the second gear 152, the third gear 153 and the fourth gear 154 is 1:2:4:8, the number of the threaded concave holes 8 is four, and are equidistantly arranged on the fixed seat 2, the number of the fixed through holes 16 is four, and the fixed through holes are equidistantly arranged on the first rotating shaft 13, one side of the first rotating shaft 13 is provided with a second through hole, the second rotating shaft 14 extends to the outside of the first rotating shaft 13 through the second through hole, the second rotating shaft 14 is movably arranged in the second through hole, the fixing member 12 is provided with a first through hole, and the first through hole is symmetrically embedded with a first bearing, the first rotating shaft 13 is movably arranged in the first bearing, the moving part 25 is provided with a second through hole, and a second bearing is symmetrically embedded in the second through hole, and the screw rod 26 is movably arranged in the second bearing.
In the invention, when in use, a rotary tillage machine is placed on a fixed platform 21, the rotary tillage machine is connected with a first rotating shaft 13 by using a flange, a crank 27 is rotated, the crank 27 drives a screw rod 26 to rotate, the screw rod 26 drives a slide block 28 to move through a movable groove, the slide block 28 drives a fixed column 29 to move, the fixed column 29 drives a second baffle 23 to move through a movable groove 30, the second baffle 23 extrudes and fixes the rotary tillage machine, a rotary motor 4 is connected with an external power supply, the rotary motor 4 is started, the rotary motor 4 drives a rotating shaft 9 to rotate through an output shaft, the rotating shaft 9 drives a driving gear 10 to rotate, the driving gear 10 drives a driven gear 15 to rotate, the driven gear 15 drives a second rotating shaft 14 and the first rotating shaft 13 to rotate, the first rotating shaft 13 drives the rotary tillage machine to work through the flange, the rotary tillage machine normally operates on the fixed platform 21, the fixed platform 21 shakes, and the vibration spring 20 elastically deforms, the fixed platform 21 drives the indication flag 32 to move, the moving amplitude of the indication flag 32 is observed, when the working speed of the rotary tillage machine needs to be adjusted, the external power supply is turned off, the rotary table 7 is rotated, the rotary table 7 drives the full-thread stud 6 to move, the full-thread stud 6 is separated from the thread concave hole 8, the mounting base 3 is moved, when the appropriate thread concave hole 8 is reached, the rotary table 7 is rotated, the rotary table 7 drives the full-thread stud 6 to move, the full-thread stud 6 enters the corresponding thread concave hole 8, the clamping column 19 is pressed, the clamping column 19 extrudes the reset spring 18, the clamping column 19 is separated from the fixed through hole 16, the second rotary shaft 14 is pulled, the driven gear 15 is driven to move, when the corresponding driven gear 15 is meshed with the driving gear 10, the clamping column 19 enters the matched fixed through hole 16, the external power supply is started, the test is continued, the structure is reasonable, and the shake test at different speeds can be carried out, simultaneously can fix rotary tillage machinery fast, improve work efficiency, avoid using the sensor simultaneously, practice thrift manufacturing cost, satisfy the demand of using.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (7)
1. A running-in test bed for rotary tillage machinery comprises a test bed body (1) and is characterized in that a fixing seat (2) is arranged at the top end of the test bed body (1), a mounting seat (3) is movably arranged on one side, far away from the test bed body (1), of the fixing seat (2), a rotating motor (4) is connected with one side of the mounting seat (3), a through groove (5) is formed in the mounting seat (3), a full-thread stud (6) is arranged in the through groove (5), the full-thread stud (6) extends out of the mounting seat (3), a turntable (7) is arranged on one side, far away from the fixing seat (2), of the full-thread stud (6), a threaded concave hole (8) is formed in one side, close to the mounting seat (3), of the fixing seat (2), the full-thread stud (6) is movably arranged in the threaded concave hole (8), and the full-thread stud (6) is matched with the threaded concave hole (8), one side of the rotating motor (4) far away from the mounting seat (3) is connected with a rotating shaft (9) through an output shaft, a driving gear (10) is sleeved on the rotating shaft (9), a connecting piece (11) is arranged on one side of the fixing seat (2), the bottom end of the connecting piece (11) is fixed on the test bed body (1), a fixing piece (12) is arranged at the top end of the connecting piece (11), a first rotating shaft (13) is arranged in the fixing piece (12) in a movable mode, the first rotating shaft (13) extends out of the fixing piece (12), the first rotating shaft (13) is of a hollow structure, a second rotating shaft (14) is arranged in the first rotating shaft (13) in a movable mode, the second rotating shaft (14) extends out of the first rotating shaft (13), one end of the second rotating shaft (14) extending out of the first rotating shaft (13) is connected with a driven gear (15), and the driven gear (15) is meshed with the driving gear (10), a fixing through hole (16) is formed in the first rotating shaft (13), a fixing groove (17) is formed in the second rotating shaft (14), a return spring (18) is arranged on the inner wall of the fixing groove (17), a clamping column (19) is connected to the top end of the return spring (18), the clamping column (19) is movably arranged in the fixing through hole (16), two vibration springs (20) are arranged on one side, away from the fixing seat (2), of the connecting piece (11), and the vibration springs (20) are symmetrically arranged on the test bed body (1);
the top end of the vibration spring (20) is provided with the same fixed platform (21), the top end of the fixed platform (21) is provided with a first baffle (22) and a second baffle (23), the second baffle (23) is arranged on one side of the first baffle (22), the second baffle (23) is movably arranged on the fixed platform (21), the fixed platform (21) is of a hollow structure, the bottom end of the inner wall of the fixed platform (21) is provided with an installation part (24), the top end of the installation part (24) is provided with a moving part (25), the moving part (25) is internally movably provided with a lead screw (26), the lead screw (26) extends out of the fixed platform (21), one end of the lead screw (26) extending out of the fixed platform (21) is connected with a crank (27), the lead screw (26) is provided with a movable groove, the movable groove is internally movably provided with a slide block (28), and the slide block (28) extends out of the lead screw (26), the top end of the sliding block (28) is connected with a fixed column (29), a movable groove (30) is formed in the fixed platform (21), the fixed column (29) extends out of the fixed platform (21) through the movable groove (30), and one end, extending out of the fixed platform (21), of the fixed column (29) is arranged on the second baffle (23);
an installation column is arranged on one side of the fixed table (21), an indication flag (32) is arranged on one side, far away from the fixed table (21), of the installation column, and the indication flag (32) is made of non-woven fabrics;
the driven gear (15) comprises a first gear (151), a second gear (152), a third gear (153) and a fourth gear (154), the second gear (152) is arranged on one side of the first gear (151), the third gear (153) is arranged on one side, away from the first gear (151), of the second gear (152), the fourth gear (154) is arranged on one side, away from the second gear (152), of the third gear (153), the first gear (151), the second gear (152), the third gear (153) and the fourth gear (154) are all sleeved on the second rotating shaft (14), and the radius ratio of the first gear (151), the second gear (152), the third gear (153) and the fourth gear (154) is 1:2:4: 8.
2. A rotary tillage machine running-in test bed according to claim 1, wherein one side of the fixed platform (21) is provided with a first through hole, the screw rod (26) extends out of the fixed platform (21) through the first through hole, the screw rod (26) is movably arranged in the first through hole, the crank (27) is sleeved with an anti-slip sleeve, and the anti-slip sleeve is made of silica gel material.
3. A running-in test bed for rotary tillage machinery according to claim 1, wherein the bottom end of the test bed body (1) is symmetrically provided with ground feet (31), the ground feet (31) are of a telescopic structure, and one side of the ground feet (31) away from the test bed body (1) is provided with a non-slip mat.
4. A rotary tillage machine running-in test bed according to claim 1, wherein the threaded recesses (8) are four in number and equally spaced apart on the fixed base (2), and the fixing through holes (16) are four in number and equally spaced apart on the first shaft (13).
5. A rotary tillage machine running-in test bed according to claim 1, wherein one side of the first rotating shaft (13) is provided with a second through hole, the second rotating shaft (14) extends out of the first rotating shaft (13) through the second through hole, and the second rotating shaft (14) is movably arranged in the second through hole.
6. A rotary tillage machine running-in test bed according to claim 1, wherein the fixing member (12) is provided with a first through hole, first bearings are symmetrically embedded in the first through hole, and the first rotating shaft (13) is movably arranged in the first bearings.
7. A rotary tillage machine running-in test bed according to claim 1, wherein the movable member (25) is provided with a second through hole, a second bearing is symmetrically embedded in the second through hole, and the screw rod (26) is movably arranged in the second bearing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010084426.5A CN111174998B (en) | 2020-02-10 | 2020-02-10 | Running-in test bed of rotary tillage machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010084426.5A CN111174998B (en) | 2020-02-10 | 2020-02-10 | Running-in test bed of rotary tillage machine |
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| CN111174998A CN111174998A (en) | 2020-05-19 |
| CN111174998B true CN111174998B (en) | 2021-09-21 |
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| CN202010084426.5A Active CN111174998B (en) | 2020-02-10 | 2020-02-10 | Running-in test bed of rotary tillage machine |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115979609B (en) * | 2022-12-30 | 2023-08-18 | 连云港九迁机械制造有限公司 | Rotary tillage mechanical property running-in inspection device |
| CN116465662B (en) * | 2023-04-26 | 2024-02-02 | 连云港市东堡旋耕机械有限公司 | Rotary tillage machinery running-in test equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP5164624B2 (en) * | 2008-03-21 | 2013-03-21 | 中国電力株式会社 | Vibration analysis system |
| CN204408857U (en) * | 2015-01-27 | 2015-06-24 | 重庆理工大学 | With the rotary cultivator attachment of mechanical type tilling depth regulating system |
| CN104568421B (en) * | 2015-01-27 | 2017-02-22 | 重庆理工大学 | Dynamic load testing testbed for agricultural mechanical rotary cultivation part |
| CN107046818B (en) * | 2017-05-05 | 2022-12-20 | 华中农业大学 | Hydraulic drive rotary cultivator with controllable speed ratio |
| CN209296339U (en) * | 2019-01-11 | 2019-08-23 | 郭伟丰 | A kind of rotary tillage machine run-in stand that soundproof effect is good |
| CN110702391B (en) * | 2019-10-14 | 2021-03-16 | 湖北工业大学 | Agricultural machinery rotating part vibration soil box experiment testing arrangement |
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