CN109795960B - High-order top of transporting - Google Patents
High-order top of transporting Download PDFInfo
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- CN109795960B CN109795960B CN201910117618.9A CN201910117618A CN109795960B CN 109795960 B CN109795960 B CN 109795960B CN 201910117618 A CN201910117618 A CN 201910117618A CN 109795960 B CN109795960 B CN 109795960B
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- descending valve
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- 238000003466 welding Methods 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims description 9
- 230000000903 blocking effect Effects 0.000 claims description 5
- 230000006835 compression Effects 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
- 230000005484 gravity Effects 0.000 claims description 2
- 239000012535 impurity Substances 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims 2
- 238000010521 absorption reaction Methods 0.000 abstract description 2
- 230000001174 ascending effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 210000000078 claw Anatomy 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Abstract
The invention provides a high-position conveying roof which is characterized by comprising a foot rest part, a bracket part, an oil cylinder part and a base; the foot rest part comprises a mounting plate, foot rest and universal wheels; the side wall of the mounting plate is provided with a mounting hole; the mounting plate is also provided with a guide groove; the foot rest is uniformly arranged around the mounting disc through welding; the universal wheels are arranged on the foot rest; the bracket component is provided with a tray and an adjusting screw; the tray adjusts the inclination angle through an adjusting screw; the oil cylinder part comprises an oil cylinder and an oil tank; a piston rod is arranged in the oil cylinder, and a handle and a pedal are arranged on the oil tank. The invention has simple structure, convenient operation, convenient and simple disassembly and assembly, the angle of the head tray can be adjusted according to the actual requirement, the device can also move by 360 degrees, the application range is wide, the descending speed of the piston rod is slow and stable through the arrangement of the slow descending valve, and the oil absorption speed and the ascending speed are unchanged when the piston rod is jacked; the operation is convenient and simple, and the safety is high.
Description
[ field of technology ]
The invention relates to the field of jacks, in particular to a high-position conveying jack.
[ background Art ]
The jack is a light and small lifting device which uses a rigid jacking piece as a working device and jacks up a heavy object in a small stroke of a top bracket or a bottom supporting claw. The jack is mainly used for departments such as factories and mines, transportation and the like to repair vehicles and work such as other lifting and supporting, and can be carried and operated by one person due to the light, firm, flexible and reliable structure; however, the lifting range of the common jack is limited, the lifting and supporting functions of the high-position object cannot be carried out, particularly, the engine is dismantled in the aspect of repairing the automobile, and because the engine is heavy, the engine is detached from the automobile and then placed on the jack, a worker needs to decompress the jack to enable the jack to fall so as to ensure stability in moving, but in the decompression process, the falling speed is too high due to the fact that the weight of the engine is too heavy, the engine is likely to fall, damage is caused, and potential safety hazards are caused for operators; when the high-order conveying top pressure relief, the oil-releasing pedal is stepped on by a worker to enable the high-order conveying top pressure relief to fall, the operation is troublesome, and if the experience of the operator is insufficient, the stepping mode is incorrect, the falling speed is likely to be unstable, so that the engine is easy to fall when falling. In the existing high-position conveying roof, the supporting part and the conveying part are matched together to finish the functions of lifting and supporting, and the work is difficult to finish in special terrains due to unstable placement positions. For this purpose, a high-level transport roof is proposed.
[ invention ]
The invention aims to provide two adjusting screws at the bracket part so that the angle of the head tray can be adjusted according to actual requirements; the universal wheels are arranged on the foot rest, so that time and labor are saved, and the foot rest can move by 360 degrees; the piston rod is lifted by adopting a pedal mode, so that the force application is convenient, the oil drain valve is arranged, the piston rod is lowered by stepping on the oil drain pedal, and the time and the labor are saved and the convenience is realized; the base and the foot rest part are fixedly connected through bolts, the dismounting is convenient and simple, the oil cylinder 4 can be selected to be directly placed on the ground or placed on the foot rest according to the situation at any time, therefore, the application range is wide, the slow-descending valve is arranged in the slow-descending valve, the purpose that the piston rod slowly descends at a uniform speed is achieved through the slow-descending valve, the descending mode is realized without the need of stepping on the oil drain valve by a worker, the operation is convenient and simple, and the safety is high.
Aiming at the problems, the invention provides a high-position conveying roof which is characterized by comprising a foot rest part, a bracket part, an oil cylinder part and a base; the foot rest part comprises a mounting plate, foot rest and universal wheels; the side wall of the mounting plate is provided with a mounting hole; the mounting plate is also provided with a guide groove; the foot rest is uniformly arranged around the mounting disc through welding; the universal wheels are arranged on the foot rest; the bracket component is provided with a tray and an adjusting screw; the tray adjusts the inclination angle through an adjusting screw; the oil cylinder part comprises an oil cylinder and an oil tank; a piston rod is arranged in the oil cylinder, and a handle and a pedal are arranged on the oil tank; the pedals and the handles are arranged on the oil tank through welding; a connecting rod is also arranged on the pedal; the oil cylinder and the oil tank are arranged on the base through welding, and an oil drain valve seat is also arranged on the base; an oil drain pedal is arranged on the oil drain valve seat; the oil drain valve seat is provided with an oil pump, and the oil pump is connected with a pedal through a connecting rod.
Preferably, the bracket member is mounted on top of the piston rod by means of a screw thread.
Preferably, oil ways are arranged on the base and the oil drain valve seat, a slow-descending valve is arranged on the base in the oil tank, and comprises a slow-descending valve body, a slow-descending valve core, a slow-descending valve cover, a self-locking nut, a bolt, a plug and a slow-descending spring; the slow descending valve body is provided with an oil hole; the slow-descending valve core is provided with an oil through hole; the valve is characterized in that a limit step is arranged on the inner wall of the slow-falling valve body, an internal thread is arranged in the slow-falling valve body, an external thread is arranged on the slow-falling valve core, the slow-falling valve core is mounted to the limit step in the slow-falling valve body through a threaded connection, a plug is mounted at one end of the slow-falling valve body, and a filter screen is further arranged in the slow-falling valve body.
Preferably, the slow-descending valve cover and the slow-descending spring are sleeved on a screw rod, the screw rod is installed on the slow-descending valve core through a self-locking nut, a blocking step is arranged in the slow-descending valve core, and an installation thread is further arranged at the bottom end of the slow-descending valve body.
The invention has simple structure, convenient operation, convenient and simple disassembly and assembly, the angle of the head tray can be adjusted according to the actual requirement, the device can also move by 360 degrees, the application range is wide, the descending speed of the piston rod is slow and stable through the arrangement of the slow descending valve, and the oil absorption speed and the ascending speed are unchanged when the piston rod is jacked; the operation is convenient and simple, and the safety is high.
[ description of the drawings ]
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a partial cross-sectional view of a cylinder according to the present invention;
FIG. 3 is a cross-sectional view of a slow down valve of the present invention;
FIG. 4 is a block diagram of a slow descent valve according to the present invention;
FIG. 5 is a cross-sectional view of a slow descent valve body according to the present invention;
FIG. 6 is a schematic diagram of the slow-descent valve core structure in the invention.
Legend description: 1. a foot rest member; 11. a foot rest; 12. a mounting plate; 13. a mounting hole; 14. a guide groove; 15. a universal wheel; 2. an oil cylinder part; 21. an oil tank; 22. foot pedal; 23. an oil drain valve seat; 24. an oil drain pedal; 25. a handle; 26. a pedal mounting plate; 3. a bracket member; 31. a tray; 32. adjusting a screw; 4. an oil cylinder; 41. a piston rod; 5. a slow-descending valve; 51. an oil hole; 52. a plug; 53. a filter screen; 54. a limit step; 55. installing a thread; 56. an internal thread; 6. slowly lowering the valve body; 61. a screw; 62. slowly lowering the valve cover; 63. a slow descending spring; 64. a self-locking nut; 65. oil holes; 66. a blocking step; 67. an external thread; 68. slowly lowering the valve core; 7. an oil path; 8. an oil pump; 9. a base; 10. and a connecting rod.
[ detailed description ] of the invention
Examples: with reference to fig. 1-6, the invention provides a high-level conveying roof, which is characterized by comprising a foot rest part 1, a bracket part 3, an oil cylinder part 2 and a base 9; the foot rest part 1 comprises a mounting disc 12, a foot rest 11 and a universal wheel 15; the side wall of the mounting plate 12 is provided with a mounting hole 13; the mounting plate 12 is also provided with a guide groove 14; the foot rest 11 is uniformly arranged around the mounting plate 12 through welding; the universal wheel 15 is arranged on the foot rest 11; the bracket part 3 is provided with a tray 31 and an adjusting screw 32; the tray 31 adjusts the inclination angle through an adjusting screw 32; the oil cylinder part 2 comprises an oil cylinder 4, an oil tank 21 and a pedal 22; a piston rod 41 is arranged in the oil cylinder 4, and a handle 25 and a pedal mounting plate 26 are arranged on the oil tank 21; the pedals 22 are mounted on a pedal mounting plate 26 through bolts, and the pedal mounting plate 26 and the handle 25 are mounted on the oil tank 21 through welding; the base 9 is also provided with an oil drain valve seat 23; the oil drain valve seat 23 is provided with an oil drain pedal 24; the oil drain valve seat 23 is provided with an oil pump 8, and the oil pump 8 is connected with a pedal 22 through a connecting rod 10; the bracket member 3 is mounted on top of the piston rod 41 by means of threads; the base 9 and the oil drain valve seat 23 are provided with an oil way 7, the base 9 in the oil tank 21 is provided with a slow-descending valve 5, and the slow-descending valve 5 comprises a slow-descending valve body 6, a slow-descending valve core 68, a slow-descending valve cover 62, a self-locking nut 64, a screw 61, a plug 52 and a slow-descending spring 63; the slow descending valve body 6 is provided with an oil hole; the slow descending valve core 68 is provided with an oil through hole 65; the inner wall of the slow descending valve body 6 is provided with a limit step 54, the slow descending valve body 6 is internally provided with an internal thread 56, the slow descending valve core 68 is provided with an external thread 67, the slow descending valve core 68 is installed at the limit step in the slow descending valve body 6 through threaded connection, the plug 52 is installed at one end of the slow descending valve body 6, and the inside of the slow descending valve body 6 is also provided with a filter screen 53; the slow-descending valve cover 62 and the slow-descending spring 63 are sleeved on the screw 61, the screw 61 is installed on the slow-descending valve core 68 through the self-locking nut 64, a blocking step 66 is arranged inside the slow-descending valve core 68, and the bottom end of the slow-descending valve body 6 is further provided with an installation thread 55.
In the installation process of the slow-down valve 5, firstly, a slow-down valve cover 62 and a slow-down spring 63 are sleeved on a screw 61, then the screw 61 passes through a slow-down valve core 68, the slow-down spring 63 is blocked in the slow-down valve core 68 by a blocking step 66 in the slow-down valve core 68, then a self-locking nut 64 is arranged at the head of the screw 61 to enable the self-locking nut to be arranged on the slow-down valve core 68, then the slow-down valve core 68 is matched with an internal thread 56 in a slow-down valve body 6 through an external thread 67 to be arranged in the slow-down valve body 6, then a filter screen 53 is arranged in the slow-down valve body 6, and finally a plug 52 is arranged at the end part of the slow-down valve body 6. The slow-descent valve 5 is installed.
In the use process of the invention, the high-level conveying top is pushed to the working position through the foot rest part 1, the angle of a required tray 31 is regulated through the regulating screw 32, the oil pump 8 is driven to work through the foot pedal 22 after completion, oil in the oil tank 21 enters the oil way 7 through the slow down valve 5, then the oil is pumped into the oil cylinder 4 through the oil pump 8, the piston rod 41 is lifted, so that the tray 31 is driven to lift, the working is carried out, after the working is completed, the oil in the oil cylinder 4 is returned to the oil tank 21 through the oil way 7 through the oil way valve 5, the oil in the oil way 7 enters the slow down valve core 68 through the orifice of the slow down valve 5 in the process of oil backflow to the oil tank 21, the speed of oil backflow is controlled by the weight of a support, the speed of the backflow is determined by the speed of the piston rod 41, the gravity of the support accelerates the speed of the oil backflow, the impact force of the oil backflow forms thrust to the slow down valve 62 in the slow down valve 5, only a gap is reserved between the slow down valve cover 62 through the compression slow down spring 63 and the slow down valve core 68, thus the path of the oil backflow is reduced, the oil backflow can only flow through the gap is enabled to flow into the slow down valve cover 68 through the oil through the vent hole 65, and the slow down valve cover 68, and the oil backflow can flow through the oil through the gap hole 6, and the side wall of the slow down valve body 51, and the valve body 51 is completed, and the valve body 51 is completely cooled. The foot rest part 1 can be selected to be used for supporting according to actual requirements; the foot rest parts can also be separated by removing bolts and can work in a mode of being directly supported by the base 9.
The invention has the beneficial effects of simple structure and convenient operation, and the two adjusting screws 32 are arranged on the bracket part 3 so that the angle of the head tray 31 can be adjusted according to actual requirements; the universal wheels 15 are arranged on the foot rest 11, so that the time and labor are saved, and the foot rest can move by 360 degrees; the oil cylinder 4 and the foot rest part 1 are connected and fixed by the stud, so that the dismounting is convenient and simple, and the base 9 can be directly placed on the ground or on the foot rest part 1 according to the situation at any time, so that the application range is wide. A handle 25 is also arranged on the oil cylinder 4, so that the push-pull is convenient; the piston rod 41 is lifted by adopting the pedal 22, so that the force application is convenient, the oil drain valve is arranged, and the jack is lowered by stepping on the oil drain pedal 24, so that the time and the labor are saved and the convenience is realized; the slow-down valve 5 is arranged at the oil suction port, oil is sucked from the oil hole of the slow-down valve body 6 in the oil suction process of the slow-down valve 5, impurities in the oil are prevented from entering the slow-down valve 5 and the oil path 7 through the filter screen 53 arranged between the slow-down valve core 68 and the plug 52 to cause blockage, then the oil enters the oil path 7 through the oil through hole 65 of the slow-down valve core 68, the oil moves downwards from top to bottom in the slow-down valve 5 in the oil suction process, so the slow-down valve 5 does not act in the oil suction process and does not need to be removed, the oil flows back through the oil release valve in the oil return process, the oil return speed is accelerated due to the weight of a support, the descending speed of the piston rod 41 is accelerated, the part on the tray 31 is easy to reversely shake and drop, damage is caused, the slow-down valve cover 62 in the slow-down valve core 5 is extruded by the impact force generated by the slow-down valve core 5 in the oil return process, the slow-down valve cover 62 is formed by the impact force of the oil return flow to the slow-down valve cover 62, and only can enter the gap 51 through the oil through hole 68, and only the slow-down valve core 68 can enter the gap 51 through the oil through hole 51 at the moment; the speed of oil reflux is reduced by reducing the oil path channel during oil reflux, so that the descending speed of the piston rod 41 is reduced to ensure that the parts on the tray 31 descend stably and safely; the original control of the descending speed of the piston rod 41 is to lower the oil discharge by stepping the pedal 22 by the foot of a worker, the operation technology is high, the operation experience is needed, the descending is only needed to step the pedal 22 by the setting of the descent control valve 5, the stepping is not needed, the loosening mode is not needed, the technology is not needed, and the operation is simple, convenient, stable and safe.
The above embodiments are illustrative of the present invention, and not limiting, and any simple modifications of the present invention fall within the scope of the present invention.
Claims (1)
1. A high-position conveying roof is characterized by comprising a foot rest part, a bracket part, an oil cylinder part and a base; the foot rest part comprises a mounting plate, foot rest and universal wheels; the side wall of the mounting plate is provided with a mounting hole; the mounting plate is also provided with a guide groove; the foot rest is uniformly arranged around the mounting disc through welding; the universal wheels are arranged on the foot rest; the bracket component is provided with a tray and an adjusting screw; the tray adjusts the inclination angle through an adjusting screw; the oil cylinder part comprises an oil cylinder, an oil tank and a pedal; a piston rod is arranged in the oil cylinder, and a handle and a pedal mounting plate are arranged on the oil tank; the pedals are arranged on the pedal mounting plate through bolts, and the pedal mounting plate and the handle are arranged on the oil tank through welding; a connecting rod is also arranged on the pedal; the oil cylinder and the oil tank are arranged on the base through welding, and the base is also provided with a valve block; the valve block is arranged on the base through a bolt, and an oil drain valve seat is arranged on the valve block; an oil drain pedal is arranged on the oil drain valve seat; the valve block is provided with an oil pump, the oil pump comprises a pump body and a pump core, and the pump core is connected with a pedal through a connecting rod; the bracket component is arranged at the top of the piston rod through threads; the base and the oil drain valve seat are provided with oil ways, the base in the oil tank is provided with a slow-descending valve, and the slow-descending valve comprises a slow-descending valve body, a slow-descending valve core, a slow-descending valve cover, a self-locking nut, a bolt, a plug and a slow-descending spring; the slow descending valve body is provided with an oil hole; the slow-descending valve core is provided with an oil through hole; the inner wall of the slow-descending valve body is provided with a limit step, the slow-descending valve body is internally provided with an internal thread, the slow-descending valve core is provided with an external thread, the slow-descending valve core is mounted at the limit step in the slow-descending valve body through threaded connection, the plug is mounted at one end of the slow-descending valve body, and a filter screen for preventing impurities in oil from entering the slow-descending valve and causing blockage of an oil way is further arranged in the slow-descending valve body; the slow-descending valve cover and the slow-descending spring are sleeved on a screw rod, the screw rod is mounted on a slow-descending valve core through a self-locking nut, a blocking step is arranged in the slow-descending valve core, and a mounting thread is further arranged at the bottom end of the slow-descending valve body;
the high-order top of transporting is when using: the oil pump is driven to work by stepping on the foot through the foot rest component after the angle of the tray required by the high-order conveying roof is adjusted through the adjusting screw, oil in the oil tank enters the oil path through the slow descending valve, then the oil is pumped into the oil cylinder through the oil pump, the piston rod is lifted, thereby driving the tray to ascend, work is carried out, after the work is completed, the oil in the oil cylinder returns to the oil tank through the oil path through the oil discharging valve by stepping on the oil discharging valve, the oil in the oil path enters the slow descending valve core through the orifice of the slow descending valve in the oil backflow process, the oil backflow speed is controlled by the weight of the support, the descending speed of the piston rod is determined by the backflow speed, the oil backflow speed is accelerated by the gravity of the support, the impact force of the oil backflow forms thrust to the slow descending valve cover in the slow descending valve, only a gap is reserved between the slow descending valve cover through compression, thus the path of the oil backflow is reduced, the oil can only flow into the oil through the gap on the oil through hole of the slow descending valve core, the oil return valve body on the side wall is reduced, and the work is completed through the slow descending of the piston rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910117618.9A CN109795960B (en) | 2019-02-15 | 2019-02-15 | High-order top of transporting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910117618.9A CN109795960B (en) | 2019-02-15 | 2019-02-15 | High-order top of transporting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109795960A CN109795960A (en) | 2019-05-24 |
| CN109795960B true CN109795960B (en) | 2024-03-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910117618.9A Active CN109795960B (en) | 2019-02-15 | 2019-02-15 | High-order top of transporting |
Country Status (1)
| Country | Link |
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| CN (1) | CN109795960B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110304574A (en) * | 2019-07-04 | 2019-10-08 | 嘉兴金日升工具有限公司 | The slow drop jack of vertical oil pressure |
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|---|---|---|---|---|
| CH305519A (en) * | 1952-09-15 | 1955-02-28 | Herzog Karl Fa | Lifting device. |
| DE1576088A1 (en) * | 1964-11-20 | 1969-10-02 | Gratzmuller Jean Louis | Quick relief valve for hydraulic power cylinders |
| FR2523659A1 (en) * | 1982-03-19 | 1983-09-23 | Legris | Control economiser for compressed air - has adjustable, double reduction valve controlling actuator operating cycle of actuator moving part |
| JPS63126394U (en) * | 1987-02-09 | 1988-08-18 | ||
| JP2003252578A (en) * | 2002-03-04 | 2003-09-10 | Kayaba Ind Co Ltd | Hydraulic jack |
| CN102052357A (en) * | 2010-12-22 | 2011-05-11 | 常熟通润汽车零部件股份有限公司 | Jack hydraulic part with function of automatically regulating descending speed |
| CN202914440U (en) * | 2012-11-09 | 2013-05-01 | 昆明中铁大型养路机械集团有限公司 | Pressure-adjustable and flow-adjustable buffering hydraulic cylinder and hydraulic system |
| CN203319628U (en) * | 2013-06-28 | 2013-12-04 | 常熟通润汽车修理设备有限公司 | Rapid oil-taking and slow oil-returning valve structure for lifting tool |
| CN203373078U (en) * | 2013-07-29 | 2014-01-01 | 奉化市南方机械制造有限公司 | Moving jacking type workpiece transmission rack |
| CN205634739U (en) * | 2016-05-24 | 2016-10-12 | 常熟通润汽车修理设备有限公司 | Pedal fuel feeding mechanism vertical top of transporting of modified hydraulic pressure |
| CN206738291U (en) * | 2017-04-17 | 2017-12-12 | 杭州富阳诺德液压技术有限公司 | A kind of integral type power source |
| CN209651784U (en) * | 2019-02-15 | 2019-11-19 | 杭州富阳诺德液压技术有限公司 | A kind of high-order transport top |
-
2019
- 2019-02-15 CN CN201910117618.9A patent/CN109795960B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH305519A (en) * | 1952-09-15 | 1955-02-28 | Herzog Karl Fa | Lifting device. |
| DE1576088A1 (en) * | 1964-11-20 | 1969-10-02 | Gratzmuller Jean Louis | Quick relief valve for hydraulic power cylinders |
| FR2523659A1 (en) * | 1982-03-19 | 1983-09-23 | Legris | Control economiser for compressed air - has adjustable, double reduction valve controlling actuator operating cycle of actuator moving part |
| JPS63126394U (en) * | 1987-02-09 | 1988-08-18 | ||
| JP2003252578A (en) * | 2002-03-04 | 2003-09-10 | Kayaba Ind Co Ltd | Hydraulic jack |
| CN102052357A (en) * | 2010-12-22 | 2011-05-11 | 常熟通润汽车零部件股份有限公司 | Jack hydraulic part with function of automatically regulating descending speed |
| CN202914440U (en) * | 2012-11-09 | 2013-05-01 | 昆明中铁大型养路机械集团有限公司 | Pressure-adjustable and flow-adjustable buffering hydraulic cylinder and hydraulic system |
| CN203319628U (en) * | 2013-06-28 | 2013-12-04 | 常熟通润汽车修理设备有限公司 | Rapid oil-taking and slow oil-returning valve structure for lifting tool |
| CN203373078U (en) * | 2013-07-29 | 2014-01-01 | 奉化市南方机械制造有限公司 | Moving jacking type workpiece transmission rack |
| CN205634739U (en) * | 2016-05-24 | 2016-10-12 | 常熟通润汽车修理设备有限公司 | Pedal fuel feeding mechanism vertical top of transporting of modified hydraulic pressure |
| CN206738291U (en) * | 2017-04-17 | 2017-12-12 | 杭州富阳诺德液压技术有限公司 | A kind of integral type power source |
| CN209651784U (en) * | 2019-02-15 | 2019-11-19 | 杭州富阳诺德液压技术有限公司 | A kind of high-order transport top |
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| CN109795960A (en) | 2019-05-24 |
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