CN114485361B - Flatness measuring tool for driving disc - Google Patents
Flatness measuring tool for driving disc Download PDFInfo
- Publication number
- CN114485361B CN114485361B CN202210238161.9A CN202210238161A CN114485361B CN 114485361 B CN114485361 B CN 114485361B CN 202210238161 A CN202210238161 A CN 202210238161A CN 114485361 B CN114485361 B CN 114485361B
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- 238000005259 measurement Methods 0.000 claims abstract description 21
- 230000007246 mechanism Effects 0.000 claims description 35
- 230000005540 biological transmission Effects 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 7
- 238000004140 cleaning Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/28—Measuring arrangements characterised by the use of mechanical techniques for measuring roughness or irregularity of surfaces
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- A Measuring Device Byusing Mechanical Method (AREA)
Abstract
The invention belongs to the technical field of flatness measuring devices, in particular to a flatness measuring tool for a driving disc, which aims at the problems that three coordinates are usually used for measuring the professional size at present, the measurement is not accurate enough, the operation efficiency is low and the production process is seriously lagged, and the flatness measuring tool is provided with an operating table, wherein the top of the operating table is rotationally connected with a placing disc, the bottom of the placing disc is fixedly provided with a positioning shaft, the bottom of the operating table is fixedly provided with a motor, an output shaft of the motor is in transmission connection with the positioning shaft, the bottom of the operating table is fixedly provided with four symmetrically arranged supporting legs, two symmetrically arranged positioning rods are slidingly connected to the operating table, and the top of each positioning rod is rotationally connected with a fixing rod. The invention has simple operation and convenient use, can be convenient for clamping and fixing the driving disk, and can also measure the positions of the driving disk in different directions, thereby being convenient for people to use.
Description
Technical Field
The invention relates to the technical field of flatness measuring devices, in particular to a flatness measuring tool for a driving disc.
Background
The automobile driving disc is an important driving disc part for connecting an engine crankshaft and a hydraulic torque converter in an automobile and is used for automatic transmission type vehicles. The driving disk is connected with the engine crankshaft and two transmission parts of the hydraulic torque converter of the automatic gearbox, transmits torque to the hydraulic torque converter, and can be driven by the motor to rotate the crankshaft when the automobile is started. During operation, the driving disc is required to bear radial torque of the crankshaft driving the hydraulic torque converter to act on the driving disc during automobile running and radial torque generated by the motor driving the outer ring gear during automobile starting, and flatness measurement is required to be carried out on the automobile driving disc during machining in order to ensure accuracy of the automobile driving disc.
At present, for measurement of the professional size, three coordinates are usually used for measurement, so that the measurement is not accurate enough, the operation efficiency is low, and the production process is seriously lagged.
Disclosure of Invention
The invention aims to solve the defects that the prior art aims at the measurement of the professional size, usually three coordinates are used for measurement, the measurement is not accurate enough, the operation efficiency is low, and the production process is seriously lagged.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
The utility model provides a driving disc flatness measurement frock, includes the operation panel, the top rotation of operation panel is connected with places the dish, the bottom fixed mounting of placing the dish has the locating shaft, the bottom fixed mounting of operation panel has the motor, and the output shaft and the locating shaft transmission of motor are connected, the bottom fixed mounting of operation panel has four supporting legs that the symmetry set up, sliding connection has two locating levers that the symmetry set up on the operation panel, the top rotation of locating lever is connected with the dead lever, be equipped with positioning mechanism on the locating lever, positioning mechanism and dead lever mutually support, fixed mounting has the bracing piece on two dead levers, installs the amesdial on one bracing piece in two bracing pieces, the amesdial mutually support with placing the dish, the bottom of operation panel is equipped with reciprocating mechanism, and reciprocating mechanism mutually support with the locating lever that corresponds, reciprocating mechanism is connected with the locating shaft transmission, the top fixed mounting of placing the dish has the fixing base, be equipped with clamping mechanism on the fixing base, clamping mechanism mutually support with placing the dish.
Preferably, the reciprocating mechanism comprises two rotating shafts, the two rotating shafts are rotatably arranged at the bottom of the operating platform, the cams are fixedly arranged at the bottom ends of the rotating shafts, a jacking column is fixedly arranged at one side of the positioning shaft, a baffle is fixedly arranged at one end of the jacking column, the baffle is mutually matched with the corresponding cams, a driving gear is fixedly arranged on the positioning shaft, driven gears are fixedly arranged on the rotating shafts, the driving gear is mutually meshed with the two driven gears, two symmetrically arranged sliding holes are formed in the operating platform, sliding rods are fixedly arranged on the inner walls of the sliding holes, the sliding rods are in sliding connection with the corresponding positioning rods, a reset spring is fixedly arranged on one side inner wall of the sliding holes, one end of the reset spring is fixedly connected with the corresponding positioning rods, the rotating positioning shaft can drive the two rotating shafts to rotate through the mutual meshing of the driving gear and the two driven gears, and the rotating shaft can drive the positioning rods to move back and forth through the mutual matching of the cams, so that a dial indicator is driven to measure a driving disc on a placing disc.
Preferably, the positioning mechanism comprises two rotating plates, the two rotating plates are respectively and fixedly arranged on the positioning rod and the fixing rod, positioning holes are formed in the two rotating plates, the two positioning holes are movably connected with the same positioning pin, and the positioning rod and the fixing rod can be fixed through the positioning holes on the two rotating plates and the positioning pin.
Preferably, the clamping mechanism comprises two symmetrically arranged wedge-shaped clamping blocks, positioning grooves are formed in two sides of the fixing base, the wedge-shaped clamping blocks are in sliding connection with the corresponding positioning grooves, a top spring is fixedly mounted on one side inner wall of the positioning grooves, one end of the top spring is fixedly connected with the corresponding wedge-shaped clamping blocks, a sliding cavity is formed in the fixing base, a movable plate is slidably connected to the inner wall of the sliding cavity, a push rod is fixedly mounted at the top of the movable plate, two symmetrically arranged conical ejector rods are fixedly mounted at the bottom of the movable plate, grooves are formed in the tops of the wedge-shaped clamping blocks, the conical ejector rods are matched with the corresponding grooves, the wedge-shaped clamping blocks can clamp and fix a driving disc under the action of the top spring, and meanwhile the movable conical ejector rods can drive the wedge-shaped clamping blocks to move through the mutual matching of the grooves, so that the driving disc is separated from the clamping and fixed.
Preferably, the output shaft of the motor is fixedly provided with a first sprocket, the positioning shaft is fixedly provided with a second sprocket, the first sprocket and the second sprocket are engaged with one chain, the output shaft of the motor can drive the positioning shaft to rotate through the mutual engagement of the first sprocket, the second sprocket and the chain, and then the placing disc can be driven to rotate.
Compared with the prior art, the invention has the advantages that:
(1) According to the scheme, due to the fact that the first chain wheel, the second chain wheel and the chain are meshed with each other, the output shaft of the motor can drive the placing disc to rotate, and then the driving disc can be comprehensively measured;
(2) Because the driving gear is meshed with the driven gear, and the cam is matched with the baffle, the rotating positioning shaft can drive the positioning rod to move back and forth, and then the dial indicator on the fixed rod is driven to measure different positions back and forth;
(3) Because the effect of two wedge fixture blocks, and the jacking spring is to the roof pressure effect of wedge fixture block to can carry out the clamping to the driving disk of placing on the dish and fix, and through the cooperation of toper ejector pin and recess, dismantle the driving disk, be convenient for install.
The invention has simple operation and convenient use, can be convenient for clamping and fixing the driving disk, and can also measure the positions of the driving disk in different directions, thereby being convenient for people to use.
Drawings
FIG. 1 is a schematic diagram of a flatness measurement tool for a driving disc according to the present invention;
FIG. 2 is a schematic side view of a flatness measurement tool for a driving disc according to the present invention;
FIG. 3 is a schematic cross-sectional view of a driving gear and a driven gear of a driving disc flatness measuring tool according to the present invention;
FIG. 4 is a schematic structural view of part A of a driving disc flatness measurement tool according to the present invention;
fig. 5 is a schematic diagram of a B part structure of a driving disc flatness measurement tool according to the present invention.
In the figure: 1. an operation table; 2. placing a tray; 3. positioning a shaft; 4. a motor; 5. a rotating shaft; 6. a positioning rod; 7. a fixed rod; 8. a support rod; 9. a dial gauge; 10. a cleaning brush; 11. a sliding hole; 12. a slide bar; 13. a return spring; 14. a cam; 15. a baffle; 16. a top column; 17. a drive gear; 18. a driven gear; 19. a rotating plate; 20. positioning holes; 21. a positioning pin; 22. a fixing seat; 23. a positioning groove; 24. wedge-shaped clamping blocks; 25. a sliding chamber; 26. a movable plate; 27. a push rod; 28. a conical ejector rod; 29. a groove; 30. and (5) pushing the spring.
Detailed Description
The technical solutions of the present embodiment will be clearly and completely described below with reference to the drawings in the present embodiment, and it is apparent that the described embodiments are only some embodiments of the present embodiment, not all embodiments.
Example 1
Referring to fig. 1-5, a driving disc flatness measurement tool comprises an operation table 1, a placing disc 2 is rotatably connected to the top of the operation table 1, a positioning shaft 3 is fixedly installed at the bottom of the placing disc 2, a motor 4 is fixedly installed at the bottom of the operation table 1, an output shaft of the motor 4 is in transmission connection with the positioning shaft 3, four symmetrically-arranged supporting legs are fixedly installed at the bottom of the operation table 1, two symmetrically-arranged positioning rods 6 are slidably connected to the operation table 1, fixing rods 7 are rotatably connected to the top ends of the positioning rods 6, positioning mechanisms are arranged on the positioning rods 6 and are mutually matched with the fixing rods 7, supporting rods 8 are fixedly installed on the two fixing rods 7, a dial indicator 9 is installed on one supporting rod 8 of the two supporting rods 8, the dial indicator 9 is mutually matched with the placing disc 2, a reciprocating mechanism is arranged at the bottom of the operation table 1 and is mutually matched with the corresponding positioning rods 6, the reciprocating mechanism is in transmission connection with the positioning shaft 3, fixing seats 22 are fixedly installed at the top of the placing disc 2, and clamping mechanisms are arranged on the fixing seats 22.
In this embodiment, the reciprocating mechanism includes two pivots 5, two pivots 5 rotate the bottom of installing at operation panel 1, and the bottom fixed mounting of pivot 5 has cam 14, one side fixed mounting of locating lever 6 has jack post 16, the one end fixed mounting of jack post 16 has baffle 15, baffle 15 and corresponding cam 14 mutually support, fixed mounting has driving gear 17 on the locating shaft 3, fixed mounting has driven gear 18 in the pivot 5, driving gear 17 and two driven gear 18 intermesh, two slide holes 11 that symmetry set up have been seted up on the operation panel 1, fixed mounting has slide bar 12 on the inner wall of slide hole 11, slide bar 12 and corresponding locating lever 6 sliding connection, fixed mounting has reset spring 13 on the one side inner wall of slide hole 11, reset spring 13's one end and corresponding locating lever 6 fixed connection, pivoted locating shaft 3 can drive two pivots 5 through the intermeshing of driving gear 17 and two driven gears 18, pivoted pivot 5 passes through the intermeshing of cam 14 and baffle 15, thereby can drive locating lever 6 removal, and then drive micrometer 9 and make a round trip to drive the measuring to place the driving disk on the micrometer gauge 2 and make a round trip.
In this embodiment, the positioning mechanism includes two rotating plates 19, the two rotating plates 19 are respectively and fixedly mounted on the positioning rod 6 and the fixing rod 7, positioning holes 20 are formed in the two rotating plates 19, the two positioning holes 20 are movably connected with the same positioning pin 21, and the positioning rod 6 and the fixing rod 7 can be fixed through the positioning holes 20 and the positioning pins 21 on the two rotating plates 19.
In this embodiment, clamping mechanism includes two wedge fixture blocks 24 that symmetry set up, constant head tank 23 has all been seted up to the both sides of fixing base 22, wedge fixture block 24 and corresponding constant head tank 23 sliding connection, and fixed mounting has a top spring 30 on the inner wall of one side of constant head tank 23, the one end and the wedge fixture block 24 fixed connection that correspond of top spring 30, sliding chamber 25 has been seted up on the fixing base 22, sliding connection has fly leaf 26 on the inner wall of sliding chamber 25, the top fixed mounting of fly leaf 26 has push rod 27, the conical ejector rod 28 of two symmetry settings of bottom fixed mounting of fly leaf 26, recess 29 has been seted up at the top of wedge fixture block 24, conical ejector rod 28 and the cooperation of corresponding recess 29 each other, wedge fixture block 24 can carry out the clamping to the driving disk under the effect of top spring 30 and fix, the conical ejector rod 28 that removes simultaneously can drive wedge fixture block 24 through the cooperation with recess 29 and remove, and then make the driving disk break away from the clamping fixedly.
In this embodiment, fixed mounting has first sprocket on the output shaft of motor 4, and fixed mounting has the second sprocket on the locating shaft 3, and the meshing has same chain on first sprocket and the second sprocket, and the output shaft of motor 4 can drive locating shaft 3 through the intermeshing of first sprocket, second sprocket and chain and rotate, and then can drive and place dish 2 and rotate.
The theory of operation, in operation, place the driving disk on placing the dish 2, and carry out the clamping with wedge fixture block 24 through top spring 30 and fixed, restart motor 4 switch, the output shaft of motor 4 drives locating shaft 3 through the intermeshing of first sprocket, second sprocket and chain and rotates, pivoted locating shaft 3 drives two pivots 5 through the intermeshing of driving gear 17 and two driven gears 18 and rotates, pivoted pivot 5 drives locating lever 6 through the mutually supporting of cam 14 and baffle 15 and removes, and form the effect of round trip movement through reset spring 13's effect, thereby make locating lever 6 drive the dial gauge 9 round trip movement on the dead lever 7, each position on the driving disk of removal is measured, thereby can guarantee comprehensive and the degree of accuracy of measurement, after the measurement is accomplished, take out locating pin 21 in two locating holes 20, at rotation dead lever 7, dead lever 7 drives dial gauge 9 and carries out the angle variation, thereby can be convenient for dismantle the driving disk, push rod 27 is pressed down again, push rod 27 drives fly leaf 26 and removes, fly leaf 26 passes through the taper groove 28 and the mutual supporting groove 29, thereby can break away from the fixed disk of drive 23, and make the effect of wedge fixture block 23, and make the inside the drive plate is broken away from the fixed.
Example two
Referring to fig. 1-5, a driving disc flatness measurement tool comprises an operation table 1, a placing disc 2 is rotatably connected to the top of the operation table 1, a positioning shaft 3 is fixedly installed at the bottom of the placing disc 2, a motor 4 is fixedly installed at the bottom of the operation table 1, an output shaft of the motor 4 is in transmission connection with the positioning shaft 3, four symmetrically-arranged supporting legs are fixedly installed at the bottom of the operation table 1, two symmetrically-arranged positioning rods 6 are slidably connected to the operation table 1, fixing rods 7 are rotatably connected to the top ends of the positioning rods 6, positioning mechanisms are arranged on the positioning rods 6, the positioning mechanisms are mutually matched with the fixing rods 7, supporting rods 8 are fixedly installed on the two fixing rods 7, a dial indicator 9 is installed on one supporting rod 8 of the two supporting rods 8, the dial indicator 9 is mutually matched with the placing disc 2, a reciprocating mechanism is arranged at the bottom of the operation table 1 and is mutually matched with the corresponding positioning rod 6, the reciprocating mechanism is in transmission connection with the positioning shaft 3, a fixing seat 22 is fixedly installed at the top of the placing disc 2, a clamping mechanism is arranged on the fixing seat 22, the clamping mechanism is mutually matched with the placing disc 2, and a cleaning brush 10 is mutually matched with the other supporting rod 8.
In this embodiment, the reciprocating mechanism includes two pivots 5, two pivots 5 rotate the bottom of installing at operation panel 1, and the bottom fixed mounting of pivot 5 has cam 14, one side fixed mounting of locating lever 6 has jack post 16, the one end fixed mounting of jack post 16 has baffle 15, baffle 15 and corresponding cam 14 mutually support, fixed mounting has driving gear 17 on the locating shaft 3, fixed mounting has driven gear 18 in the pivot 5, driving gear 17 and two driven gear 18 intermesh, two slide holes 11 that symmetry set up have been seted up on the operation panel 1, fixed mounting has slide bar 12 on the inner wall of slide hole 11, slide bar 12 and corresponding locating lever 6 sliding connection, fixed mounting has reset spring 13 on the one side inner wall of slide hole 11, reset spring 13's one end and corresponding locating lever 6 fixed connection, pivoted locating shaft 3 can drive two pivots 5 through the intermeshing of driving gear 17 and two driven gears 18, pivoted pivot 5 passes through the intermeshing of cam 14 and baffle 15, thereby can drive locating lever 6 removal, and then drive micrometer 9 and make a round trip to drive the measuring to place the driving disk on the micrometer gauge 2 and make a round trip.
In this embodiment, the positioning mechanism includes two rotating plates 19, the two rotating plates 19 are respectively and fixedly mounted on the positioning rod 6 and the fixing rod 7, positioning holes 20 are formed in the two rotating plates 19, the two positioning holes 20 are movably connected with the same positioning pin 21, and the positioning rod 6 and the fixing rod 7 can be fixed through the positioning holes 20 and the positioning pins 21 on the two rotating plates 19.
In this embodiment, clamping mechanism includes two wedge fixture blocks 24 that symmetry set up, constant head tank 23 has all been seted up to the both sides of fixing base 22, wedge fixture block 24 and corresponding constant head tank 23 sliding connection, and fixed mounting has a top spring 30 on the inner wall of one side of constant head tank 23, the one end and the wedge fixture block 24 fixed connection that correspond of top spring 30, sliding chamber 25 has been seted up on the fixing base 22, sliding connection has fly leaf 26 on the inner wall of sliding chamber 25, the top fixed mounting of fly leaf 26 has push rod 27, the conical ejector rod 28 of two symmetry settings of bottom fixed mounting of fly leaf 26, recess 29 has been seted up at the top of wedge fixture block 24, conical ejector rod 28 and the cooperation of corresponding recess 29 each other, wedge fixture block 24 can carry out the clamping to the driving disk under the effect of top spring 30 and fix, the conical ejector rod 28 that removes simultaneously can drive wedge fixture block 24 through the cooperation with recess 29 and remove, and then make the driving disk break away from the clamping fixedly.
In this embodiment, fixed mounting has first sprocket on the output shaft of motor 4, and fixed mounting has the second sprocket on the locating shaft 3, and the meshing has same chain on first sprocket and the second sprocket, and the output shaft of motor 4 can drive locating shaft 3 through the intermeshing of first sprocket, second sprocket and chain and rotate, and then can drive and place dish 2 and rotate.
The working principle is that the second embodiment is different from the first embodiment in that the cleaning brush 10 is arranged to facilitate cleaning of the driving disc on the placing disc 2, so that the accuracy of measurement can be ensured, and the cleaning brush is convenient for people to use.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art will be able to apply equally to the technical solution of the present invention and the inventive concept thereof, within the scope of the present invention.
Claims (3)
1. The utility model provides a driving disc flatness measurement tool, includes operation panel (1), its characterized in that, the top rotation of operation panel (1) is connected with places dish (2), the bottom fixed mounting of placing dish (2) has locating shaft (3), the bottom fixed mounting of operation panel (1) has motor (4), and the output shaft and the drive of locating shaft (3) of motor (4) are connected, the bottom fixed mounting of operation panel (1) has four supporting legs that symmetry set up, sliding connection has two locating levers (6) that symmetry set up on operation panel (1), the top rotation of locating lever (6) is connected with dead lever (7), be equipped with positioning mechanism on locating lever (6), positioning mechanism and dead lever (7) mutually support, install on two dead levers (7) bracing piece (8), install amesdial (9) on one bracing piece (8) in two bracing pieces (8), amesdameter (9) mutually support plate (2), the bottom of operation panel (1) is equipped with the supporting leg of symmetry setting, reciprocating mechanism and the corresponding reciprocating mechanism (6) is equipped with fixing base (22) mutually support plate (2), the reciprocating mechanism is equipped with fixing base (22) mutually supporting seat (22) mutually, the clamping mechanism is matched with the placing disc (2);
The reciprocating mechanism comprises two rotating shafts (5), the two rotating shafts (5) are rotatably arranged at the bottom of the operating platform (1), a cam (14) is fixedly arranged at the bottom end of each rotating shaft (5), a jacking column (16) is fixedly arranged at one side of each positioning rod (6), a baffle (15) is fixedly arranged at one end of each jacking column (16), and the baffles (15) are mutually matched with the corresponding cams (14);
The positioning mechanism comprises two rotating plates (19), the two rotating plates (19) are respectively and fixedly arranged on the positioning rod (6) and the fixed rod (7), positioning holes (20) are formed in the two rotating plates (19), and the two positioning holes (20) are movably connected with the same positioning pin (21);
the clamping mechanism comprises two symmetrically arranged wedge-shaped clamping blocks (24), positioning grooves (23) are formed in two sides of the fixing seat (22), the wedge-shaped clamping blocks (24) are in sliding connection with the corresponding positioning grooves (23), a top spring (30) is fixedly arranged on the inner wall of one side of each positioning groove (23), and one end of each top spring (30) is fixedly connected with the corresponding wedge-shaped clamping block (24);
The output shaft of the motor (4) is fixedly provided with a first chain wheel, the positioning shaft (3) is fixedly provided with a second chain wheel, and the first chain wheel and the second chain wheel are meshed with one another;
The positioning shaft (3) is fixedly provided with a driving gear (17), the rotating shaft (5) is fixedly provided with a driven gear (18), and the driving gear (17) is meshed with the two driven gears (18).
2. The driving disc flatness measurement tool according to claim 1, characterized in that two symmetrically arranged sliding holes (11) are formed in the operating table (1), sliding rods (12) are fixedly mounted on the inner walls of the sliding holes (11), the sliding rods (12) are in sliding connection with corresponding positioning rods (6), a reset spring (13) is fixedly mounted on one side inner wall of the sliding holes (11), and one end of the reset spring (13) is fixedly connected with the corresponding positioning rods (6).
3. The driving disc flatness measurement tool according to claim 1, characterized in that the fixing seat (22) is provided with a sliding cavity (25), a movable plate (26) is connected to the inner wall of the sliding cavity (25) in a sliding manner, a push rod (27) is fixedly arranged at the top of the movable plate (26), two symmetrically arranged conical push rods (28) are fixedly arranged at the bottom of the movable plate (26), grooves (29) are formed in the top of the wedge-shaped clamping blocks (24), and the conical push rods (28) are matched with the corresponding grooves (29).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210238161.9A CN114485361B (en) | 2022-03-11 | 2022-03-11 | Flatness measuring tool for driving disc |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210238161.9A CN114485361B (en) | 2022-03-11 | 2022-03-11 | Flatness measuring tool for driving disc |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114485361A CN114485361A (en) | 2022-05-13 |
| CN114485361B true CN114485361B (en) | 2024-05-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210238161.9A Active CN114485361B (en) | 2022-03-11 | 2022-03-11 | Flatness measuring tool for driving disc |
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| CN (1) | CN114485361B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117029616B (en) * | 2023-10-10 | 2024-01-12 | 烟台美丰机械集团有限公司 | Brake disc size detection equipment |
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| CN114485361A (en) | 2022-05-13 |
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