CN112816223B - Test bed for testing electric drive axle - Google Patents
Test bed for testing electric drive axle Download PDFInfo
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- CN112816223B CN112816223B CN202011634195.7A CN202011634195A CN112816223B CN 112816223 B CN112816223 B CN 112816223B CN 202011634195 A CN202011634195 A CN 202011634195A CN 112816223 B CN112816223 B CN 112816223B
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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
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
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Abstract
The invention discloses a test bed for testing an electric drive axle, which comprises a support table, wherein four corners below the support table are respectively connected with a height adjusting screw, the outer side of the height adjusting screw is connected with a screw cylinder in a meshing manner, the outer side of the screw cylinder is connected with a gear cylinder, a height driving motor is arranged below the support table and positioned between the four height adjusting screws, the output shaft end of the height driving motor is connected with a driving gear, and the driving gear is connected with the four gear cylinders in a meshing manner. The method is suitable for testing the electric drive axle.
Description
Technical Field
The invention belongs to the technical field of test beds, and particularly relates to a test bed for testing an electric drive axle.
Background
The electric drive axle, namely the drive axle, is made up of main reducer, differential mechanism, wheel drive unit and drive axle housing, etc., turn over 90 degrees with the power that the universal drive unit transmits, change the transmission direction of the force, and reduce the rotational speed by the main reducer, after increasing the torque, distribute to left and right semi-axles and drive wheel through the differential mechanism, before the electric drive axle is put into use, need to test its performance, in the course of testing, need to use the test bench, however, the existing test bench used for electric drive axle to test still has some defects.
The prior art has the following problems: 1. the height of the supporting table is inconvenient to adjust and is inconvenient for workers with different heights to operate; 2. the electric drive axle of different models is not convenient for fasten the centre gripping, and application scope is comparatively limited.
Disclosure of Invention
To solve the problems raised in the background art described above. The invention provides a test bed for testing an electric drive axle, which has the characteristics that the height of a support table is convenient to adjust, the electric drive axles of different models are convenient to fasten and clamp, a mounting plate is convenient to move, further, the electric drive axles of different positions are convenient to detect, and an L-shaped protective gasket is convenient to mount and dismount.
In order to achieve the purpose, the invention provides the following technical scheme: a test bed for testing an electric drive axle comprises a support table, wherein four corners below the support table are connected with height adjusting screws, the outer sides of the height adjusting screws are meshed with screw cylinders, the outer sides of the screw cylinders are connected with gear cylinders, height driving motors are arranged below the support table and between the four height adjusting screws, the output shaft ends of the height driving motors are connected with driving gears, the driving gears are meshed with the four gear cylinders, a base is connected below the screw cylinders, a mounting plate is connected above the support table, limiting chutes are formed in two sides of the interior of the mounting plate, clamping adjusting screws are rotatably connected to the insides of the limiting chutes, one sides, close to each other, of the two clamping adjusting screws are connected with driven bevel gears, driving bevel gears are meshed with the two driven bevel gears through the upper sides, clamping driving motors are arranged above the driving bevel gears and in the middle positions above the mounting plate, the output shafts of the clamping driving motors extend to the insides of the mounting plate and are connected with the driving bevel gears, the outer sides of the clamping adjusting screws are meshed with supporting screw blocks, and L-shaped clamping plates are connected above the supporting screw blocks; the lower end of the screw cylinder is rotatably connected inside the base through a first bearing, and the ends, far away from each other, of the two clamping adjusting screws are rotatably connected inside the mounting plate through a second bearing; the lower end of the driving conical gear and one side, far away from each other, of the two driven conical gears are connected with a supporting rotary column, and the supporting rotary column is rotatably connected to the inside of the mounting plate through a third bearing; and the upper surface of the L-shaped clamping plate is connected with an L-shaped protective gasket.
Preferably, two one side that L type protection gasket kept away from each other all is connected with T type guide block, T type guide slot has been seted up to the inside of L type clamp plate and the position department that corresponds T type guide block, the below of L type protection gasket evenly is connected with a plurality of elasticity fastener, the draw-in groove has been seted up to the inside of L type clamp plate and the position department that corresponds the elasticity fastener, elasticity fastener joint is in the inside of draw-in groove.
Preferably, the below intermediate position department of mounting panel is connected with the removal spiral shell piece, the shifting chute has been seted up to the inside of propping up supporting bench and the position department that corresponds the removal spiral shell piece, the inside of shifting chute is rotated and is connected with removal adjusting screw, remove the meshing of spiral shell piece and connect in the outside of removing adjusting screw, the one end of removing adjusting screw is passed through the fourth bearing and is rotated and connect in the inside of propping up supporting bench, the other end of removing adjusting screw runs through the outside that a supporting bench extends to a supporting bench, the removal driving motor is installed in the outside of a supporting bench, the output shaft end of removing driving motor extends to the inside of a supporting bench and is connected with removal adjusting screw.
Preferably, the below both sides of mounting panel all are connected with supporting slide, the inside of brace table and the position department that corresponds supporting slide have seted up balanced spout, supporting slide sliding connection is in the inside of balanced spout.
Preferably, the inside below of balanced spout evenly is connected with a plurality of concave frame, the outside of concave frame is rotated and is connected with the anti-grinding pearl, the inside of supporting slide block and the position department that corresponds a plurality of anti-grinding pearl have seted up spacing track.
Preferably, the lower surface of the base is connected with a silica gel gasket.
Preferably, the limiting rings are connected to the outer side of the screw cylinder and located on the upper side and the lower side of the gear cylinder.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, through arranging the height adjusting screw rod, the screw barrel, the moving driving motor, the height driving motor, the driving gear and the gear barrel base, under the mutual cooperation of the structures, the function of conveniently adjusting the height of the supporting platform is realized, so that the device is suitable for operators with different heights to operate, the automation degree is high, and the stability of the device is strong.
2. According to the invention, by arranging the limiting ring, an effective limiting effect is achieved under the action of the limiting ring, the driving gear is prevented from being separated from the toothed cylinder, the situation that the height adjusting screw rod is separated from the threaded cylinder is further avoided, and unnecessary troubles are avoided.
3. According to the invention, through arranging the clamping driving motor, the L-shaped clamping plate, the mounting plate, the clamping adjusting screw, the limiting chute, the supporting screw block, the driving bevel gear and the driven bevel gear, under the mutual cooperation of the structures, the function of fastening and clamping electric drive axles of different models is realized, the application range is wide, and the practicability is strong.
4. According to the invention, through arranging the L-shaped protective gasket, the T-shaped guide groove, the T-shaped guide block, the elastic clamping piece and the clamping groove, under the mutual cooperation of the structures, the electric drive axle can be effectively protected while being clamped, the L-shaped protective gasket is convenient to mount and dismount, and further can be replaced when being aged after long-term use, so that the guarantee efficiency of the electric drive axle in the subsequent use process is ensured.
5. According to the invention, through arranging the mobile driving motor, the mobile groove and the mobile adjusting screw rod, under the mutual cooperation of the structures, the function of enabling the mounting plate to move is realized, and further the function of testing different positions of the electric drive axle is realized.
6. The mounting plate is provided with the supporting slide block, the balance sliding groove, the limiting track, the concave frame and the anti-abrasion balls, under the mutual matching of the structures, the function of further ensuring the balanced movement and the placement of the mounting plate is realized, and the anti-abrasion balls can effectively reduce the abrasion between the supporting slide block and the inner side wall of the balance sliding groove when the supporting slide block moves, so that the service life of the mounting plate is effectively prolonged.
Drawings
FIG. 1 is a front view of the present invention;
FIG. 2 is a schematic structural view of a cross section of the present invention;
FIG. 3 isbase:Sub>A schematic view of the structure of the section A-A of FIG. 2 according to the present invention;
FIG. 4 is a schematic structural view of the base, the gear barrel, the screw barrel and the height adjusting screw of FIG. 2;
FIG. 5 is a schematic view of the structure of section B-B of FIG. 2 according to the present invention;
FIG. 6 is an enlarged view of the structure of FIG. 2 at C;
FIG. 7 is an enlarged schematic view of the structure of FIG. 2;
FIG. 8 is an enlarged schematic view of the invention at E of FIG. 2;
FIG. 9 is an enlarged schematic view of the invention at F of FIG. 7;
in the figure: 1. a support table; 2. a clamping drive motor; 3. a height adjusting screw; 4. a screw cylinder; 5. a limiting ring; 6. a movement driving motor; 7. a height drive motor; 8. a driving gear; 9. a gear cylinder; 10. a base; 11. an L-shaped clamping plate; 12. mounting a plate; 13. clamping an adjusting screw; 14. a limiting chute; 15. supporting the screw block; 16. moving the screw block; 17. a support slide block; 18. a moving groove; 19. moving the adjusting screw; 20. a driving bevel gear; 21. a driven bevel gear; 22. an L-shaped protective pad; 23. a T-shaped guide groove; 24. a T-shaped guide block; 25. a balancing chute; 26. a limiting track; 27. a concave frame; 28. anti-abrasion beads; 29. the elastic clamping piece; 30. a clamping groove.
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. 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.
Referring to fig. 1-9, the present invention provides the following technical solutions: the utility model provides a test bench for electric drive axle test, including brace table 1, four corners in the below of brace table 1 all are connected with high adjusting screw 3, high adjusting screw 3's outside meshing is connected with a barrel 4, the outside of barrel 4 is connected with a barrel 9, brace table 1's below and the position department that is located between four high adjusting screw 3 install high driving motor 7, high driving motor 7's output shaft end is connected with driving gear 8, driving gear 8 is connected with four barrel 9 meshing, the below of barrel 4 is connected with base 10, brace table 1's top is connected with mounting panel 12, spacing spout 14 has all been seted up to the inside both sides of mounting panel 12, the internal rotation of spacing spout 14 is connected with centre gripping adjusting screw 13, the one side that two centre gripping adjusting screw 13 are close to each other all is connected with driven bevel gear 21, be connected with initiative bevel gear 20 by the top meshing between two driven bevel gear 21, centre gripping driving bevel gear 20's top just is located mounting panel 12 installs centre gripping driving motor 2 in top, the output shaft end of centre gripping driving motor 2 extends to be connected with initiative bevel gear 20 and is connected with centre gripping adjusting screw 20, the top of support screw 15 type L11 that presss from both sides tight L11.
Specifically, the lower end of the screw cylinder 4 is rotatably connected to the inside of the base 10 through a first bearing, and the ends of the two clamping adjusting screws 13, which are far away from each other, are rotatably connected to the inside of the mounting plate 12 through a second bearing.
Through adopting above-mentioned technical scheme, guarantee the stable rotation and the placing of spiral shell 4 and centre gripping adjusting screw 13.
Specifically, the lower end of the driving bevel gear 20 and one side of the two driven bevel gears 21 away from each other are connected with a supporting rotary column, and the supporting rotary column is rotatably connected to the inside of the mounting plate 12 through a third bearing.
By adopting the technical scheme, the stable rotation and placement of the driving bevel gear 20 and the driven bevel gear 21 are convenient to ensure.
Specifically, an L-shaped protection pad 22 is connected to the upper surface of the L-shaped clamping plate 11.
Through adopting above-mentioned technical scheme, be convenient for effectively protect electric drive axle, avoid the clamp force too big, cause the damage to it, bring unnecessary economic loss.
Specifically, one side that two L type protection gaskets 22 kept away from each other all is connected with T type guide block 24, T type guide slot 23 has been seted up to the inside of L type clamp plate 11 and the position department that corresponds T type guide block 24, the below of L type protection gasket 22 evenly is connected with a plurality of elasticity fastener 29, draw-in groove 30 has been seted up to the inside of L type clamp plate 11 and the position department that corresponds elasticity fastener 29, elasticity fastener 29 joint in the inside of draw-in groove 30.
Through adopting above-mentioned technical scheme, be convenient for realize the function of centre gripping driving motor 2 installation and dismantlement to when L type protection gasket 22 used for a long time and appearing ageing, be convenient for change it, carry out better protection to electric drive axle in order to guarantee it in follow-up use.
Specifically, the below intermediate position department of mounting panel 12 is connected with removal spiral shell piece 16, supporting bench 1's inside and the position department that corresponds removal spiral shell piece 16 have seted up shifting chute 18, the inside of shifting chute 18 is rotated and is connected with removal adjusting screw 19, remove the meshing of spiral shell piece 16 and connect in the outside that removes adjusting screw 19, the one end of removing adjusting screw 19 is passed through the fourth bearing and is rotated and connect in supporting bench 1's inside, the other end that removes adjusting screw 19 runs through supporting bench 1 and extends to the outside of supporting bench 1, remove driving motor 6 in the outside of supporting bench 1 is installed, the output shaft end that removes driving motor 6 extends to the inside of supporting bench 1 and is connected with removal adjusting screw 19.
Through adopting above-mentioned technical scheme, the mounting panel 12 of being convenient for removes, and then is convenient for realize the change of electric drive axle position department to be convenient for test the different positions of electric drive axle.
Specifically, the below both sides of mounting panel 12 all are connected with supporting slide 17, prop up the inside of supporting bench 1 and have seted up balanced spout 25 corresponding supporting slide 17's position department, and supporting slide 17 sliding connection is in the inside of balanced spout 25.
By adopting the technical scheme, the balance of the mounting plate 12 in moving and placing is convenient to ensure.
Specifically, the inside below of balanced spout 25 evenly is connected with a plurality of concave frame 27, and the outside of concave frame 27 is rotated and is connected with anti-abrasion pearl 28, and the inside of supporting slide 17 and the position department that corresponds a plurality of anti-abrasion pearl 28 have seted up spacing track 26.
By adopting the technical scheme, the abrasion between the supporting slide block 17 and the inner wall of the balance slide groove 25 during moving is reduced conveniently.
Specifically, the lower surface of the base 10 is connected with a silica gel gasket.
Through adopting above-mentioned technical scheme, be convenient for guarantee that the holistic stability of the device is placed.
Specifically, the limiting rings 5 are connected to the outer side of the screw cylinder 4 and the upper and lower sides of the gear cylinder 9.
Through adopting above-mentioned technical scheme, be convenient for carry on spacingly to driving gear 8, avoid the driving gear 8 to break away from the condition of tooth section of thick bamboo 9 to appear to can carry on spacingly to height adjusting screw 3, avoid the condition that height adjusting screw 3 breaks away from barrel 4 to appear, it is troublesome to have reduced unnecessary.
The working principle and the using process of the invention are as follows: when the height adjusting device is used, firstly, a switch of the height driving motor 7 can be started, under the meshing action, the driving gear 8 drives the four tooth cylinders 9 to rotate, so that the screw cylinder 4 rotates along the height adjusting screw rods 3, and under the meshing action, the four height adjusting screw rods 3 drive the supporting table 1 to longitudinally move;
an operator places the electric drive axle between the two L-shaped clamping plates 11, starts a switch of the clamping driving motor 2, and enables the driving bevel gear 20 to drive the driven bevel gear 21 to rotate under the meshing action, so that the clamping adjusting screw 13 rotates inside the supporting screw block 15, and under the meshing action, the two supporting screw blocks 15 drive the L-shaped clamping plates 11 to move oppositely along the limiting sliding grooves 14, so that the electric drive axle is clamped under the action of an L-shaped protective gasket 22, and meanwhile, the electric drive axle is effectively protected;
when testing operation is carried out, if different positions of the electric drive axle need to be tested, only the switch of the movable drive motor 6 needs to be started, so that the movable adjusting screw 19 rotates in the movable screw block 16, the movable screw block 16 is driven to move along the inner part of the movable groove 18 under the meshing action, the mounting plate 12 drives the electric drive axle above the mounting plate to move, the electric drive axle moves to a specified position, and the switch of the movable drive motor 6 is closed;
in the moving process of the mounting plate 12, the supporting slide block 17 moves along the inside of the balance sliding groove 25, so that an effective balance effect is achieved on the mounting plate 12, and when the supporting slide block 17 moves, the anti-abrasion balls 28 slide along the inside of the limiting track 26 while rolling along the concave frame 27, so that abrasion between the supporting slide block 17 and the inner wall of the balance sliding groove 25 is effectively reduced;
after the device is used for a period of time, if the L-shaped protective gasket 22 is aged, the lower end of the L-shaped protective gasket 22 can be pulled under the action of external force, the elastic clamping piece 29 is separated from the clamping groove 30 under the action of the elastic force of the elastic clamping piece 29, the T-shaped guide block 24 is pulled upwards, the T-shaped guide block 24 moves along the T-shaped guide groove 23 until the T-shaped guide block 24 is completely separated from the T-shaped guide groove 23, the L-shaped protective gasket 22 is completely taken down, and a new L-shaped protective gasket 22 is installed again.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (3)
1. A test bench for electric drive axle testing, includes a supporting bench (1), its characterized in that: four corners below the supporting table (1) are connected with height adjusting screws (3), the outer side of each height adjusting screw (3) is meshed with a screw cylinder (4), the outer side of each screw cylinder (4) is connected with a gear cylinder (9), the position between the four height adjusting screws (3) below the supporting table (1) is provided with a height driving motor (7), the output shaft end of each height driving motor (7) is connected with a driving gear (8), the driving gear (8) is meshed with the four gear cylinders (9), the base (10) is connected below the screw cylinder (4), the mounting plate (12) is connected above the supporting table (1), limiting chutes (14) are respectively arranged on two inner sides of the mounting plate (12), the inner rotation of the limiting chutes (14) is connected with a clamping adjusting screw (13), one sides of the two clamping adjusting screws (13) close to each other are respectively connected with driven bevel gears (21), two driven bevel gears (21) are connected with driving bevel gears (20) by meshing of the upper part, the driving bevel gears (20) are arranged above the middle position of the mounting plate (12), and the driving bevel gears (2) extend to the output shaft end of the driving motor (12), the outer side of the clamping adjusting screw rod (13) is connected with a supporting screw block (15) in a meshed mode, and an L-shaped clamping plate (11) is connected above the supporting screw block (15); the lower end of the screw cylinder (4) is rotatably connected to the inside of the base (10) through a first bearing, and the ends, far away from each other, of the two clamping adjusting screws (13) are rotatably connected to the inside of the mounting plate (12) through a second bearing; the lower end of the driving conical gear (20) and one side, far away from each other, of each of the two driven conical gears (21) are connected with a supporting rotary column, and the supporting rotary column is rotatably connected to the inside of the mounting plate (12) through a third bearing; the upper surface of the L-shaped clamping plate (11) is connected with an L-shaped protective gasket (22);
one side, away from each other, of each of the two L-shaped protective gaskets (22) is connected with a T-shaped guide block (24), a T-shaped guide groove (23) is formed in the L-shaped clamping plate (11) and corresponds to the position of the T-shaped guide block (24), a plurality of elastic clamping pieces (29) are uniformly connected below the L-shaped protective gaskets (22), a clamping groove (30) is formed in the L-shaped clamping plate (11) and corresponds to the position of the elastic clamping piece (29), and the elastic clamping pieces (29) are clamped in the clamping groove (30);
the support structure is characterized in that a movable screw block (16) is connected to the middle position below the mounting plate (12), a movable groove (18) is formed in the support table (1) and corresponds to the position of the movable screw block (16), a movable adjusting screw rod (19) is rotatably connected to the inside of the movable groove (18), the movable screw block (16) is meshed and connected to the outer side of the movable adjusting screw rod (19), one end of the movable adjusting screw rod (19) is rotatably connected to the inside of the support table (1) through a fourth bearing, the other end of the movable adjusting screw rod (19) penetrates through the support table (1) and extends to the outer side of the support table (1), a movable driving motor (6) is mounted on the outer side of the support table (1), and the output shaft end of the movable driving motor (6) extends to the inside of the support table (1) and is connected with the movable adjusting screw rod (19);
two sides of the lower part of the mounting plate (12) are both connected with supporting sliding blocks (17), a balance sliding groove (25) is formed in the supporting table (1) and corresponds to the position of the supporting sliding blocks (17), and the supporting sliding blocks (17) are connected to the inside of the balance sliding groove (25) in a sliding manner;
the inside below of balanced spout (25) evenly is connected with a plurality of concave frame (27), the outside of concave frame (27) is rotated and is connected with anti-abrasion pearl (28), inside and the position department that corresponds a plurality of anti-abrasion pearl (28) of support slider (17) have seted up spacing track (26).
2. A test stand for electric transaxle testing in accordance with claim 1, wherein: the lower surface of the base (10) is connected with a silica gel gasket.
3. A test stand for electric drive axle testing according to claim 1, characterized in that: the limiting rings (5) are connected to the outer side of the screw cylinder (4) and the upper side and the lower side of the gear cylinder (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011634195.7A CN112816223B (en) | 2020-12-31 | 2020-12-31 | Test bed for testing electric drive axle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011634195.7A CN112816223B (en) | 2020-12-31 | 2020-12-31 | Test bed for testing electric drive axle |
Publications (2)
| Publication Number | Publication Date |
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| CN112816223A CN112816223A (en) | 2021-05-18 |
| CN112816223B true CN112816223B (en) | 2023-02-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011634195.7A Active CN112816223B (en) | 2020-12-31 | 2020-12-31 | Test bed for testing electric drive axle |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116698444B (en) * | 2023-06-07 | 2024-02-20 | 武汉博源通新能源实业有限公司 | Axle testing platform |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100494946C (en) * | 2006-06-26 | 2009-06-03 | 合肥工业大学 | Test stage for detecting noise of rear axle |
| CN108527206A (en) * | 2018-06-26 | 2018-09-14 | 陈姿红 | A kind of adjustable for height auto parts and components detection fixture |
| CN109202128A (en) * | 2018-10-26 | 2019-01-15 | 大连理工高邮研究院有限公司 | A kind of rear axle of electric automobile flange processing drilling equipment and method |
| CN209589497U (en) * | 2019-04-15 | 2019-11-05 | 江铃集团山东华岳车辆部件有限公司 | A kind of vehicle bridge platform frame testing clamp device |
| CN209802636U (en) * | 2019-04-23 | 2019-12-17 | 莆田城厢振达宸贸易有限公司 | Clamping device for detecting electromagnetic valve |
| CN110253467A (en) * | 2019-06-18 | 2019-09-20 | 徐州玉伟机械设备有限公司 | Bracket is used in a kind of production and processing of automobile axle |
| CN210037180U (en) * | 2019-07-01 | 2020-02-07 | 天津威捷力科技有限公司 | Rubber tube detection device |
| CN210524486U (en) * | 2019-08-19 | 2020-05-15 | 苏州联致盈精密机械有限公司 | Servo motor shell clamping device |
| CN210790454U (en) * | 2019-10-21 | 2020-06-19 | 山东辉鲁机械有限公司 | Drive axle housing grinding device |
| CN210982544U (en) * | 2019-11-04 | 2020-07-10 | 淮安金达太阳能科技有限公司 | Clamp for circuit board test |
| CN210893658U (en) * | 2019-12-11 | 2020-06-30 | 济源职业技术学院 | Axle assembly running-in test bench strutting arrangement |
| CN211540366U (en) * | 2020-01-16 | 2020-09-22 | 许金国 | Part machining tool |
| CN211841699U (en) * | 2020-04-13 | 2020-11-03 | 江西同盛机械有限责任公司 | Fixing device for automobile part detection |
| CN212136896U (en) * | 2020-05-20 | 2020-12-11 | 苏州隆宁电力工程有限公司 | Fusing equipment suitable for box-type substation |
| CN111632984B (en) * | 2020-05-26 | 2022-02-11 | 嘉兴职业技术学院 | Novel laboratory fume chamber |
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