CN110682241A - Novel mechanical torque wrench - Google Patents
Novel mechanical torque wrench Download PDFInfo
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- CN110682241A CN110682241A CN201911161907.5A CN201911161907A CN110682241A CN 110682241 A CN110682241 A CN 110682241A CN 201911161907 A CN201911161907 A CN 201911161907A CN 110682241 A CN110682241 A CN 110682241A
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- 230000005540 biological transmission Effects 0.000 claims abstract description 76
- 230000007246 mechanism Effects 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B13/00—Spanners; Wrenches
- B25B13/48—Spanners; Wrenches for special purposes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
- B25B23/0071—Abutment for screws or nuts
Abstract
A novel mechanical torque wrench comprises a driving part, a transmission part and a force application part, wherein the acting force of the driving part is transmitted to the force application part through the transmission part, and the transmission part comprises a first transmission part and a second transmission part which are separately arranged; when the force acts on the first transmission part, the driving part and the first transmission part form a whole body to transmit the lever; when the force acts on the second transmission part, the driving part is separated from the first transmission part and is in gear contact with the second transmission part, and the gear transmission for increasing the torsion is carried out. This novel mechanical type torque wrench through the setting of drive division, first transmission portion, second transmission portion and application of force portion for this mechanical type wrench possesses two kinds of structural condition, can realize the conversion of initial little torsion's demand and follow-up big torsion, has improved the work efficiency of screwing of treating lock nut.
Description
Technical Field
The invention belongs to the technical field of torque wrenches, and particularly relates to a novel mechanical torque wrench.
Background
The fixed bolt that all adopts big specification of iron tower usually strengthens in transmission line stringing construction process, and common bolt fastening mode mainly includes: the torque multiplier is fastened and the hydraulic torque wrench is fastened, the two fastening modes have good fastening effects, but the two fastening modes have the defects of high cost, large weight, complex operation and the like. At present main fastening mode still carries out artificial fastening operation through box spanner, and box spanner's tip is fixed knot and constructs, and the turned angle of artificial hand is limited, when adopting the spanner to fasten the nut, need separate spanner and nut after screwing to certain angle when the spanner, carries out repetitive operation afterwards. Because the force arm of the wrench is limited, the wrench is very laborious to use and has lower operating efficiency.
The Chinese invention patent 'planet gear torque-variable torque wrench' (publication number: CN104924248A) discloses a planet gear torque-variable torque wrench, which mainly comprises a handle, an inner gear ring, a planet carrier, a planet gear, a sun gear, a control gear ring and a joint, and is mainly characterized in that: the handle and the planet carrier are used as driving elements, the inner gear ring and the joint are used as driven elements, the sun gear is connected with the planet carrier through the control gear ring, and the gear ring is controlled to enable the transmission ratio between the planet carrier and the sun gear to be larger than 1; the control gear ring is fixedly connected to the handle, eccentrically arranged with the sun gear and internally meshed with the sun gear; the planet carrier is provided with a positioning block which is matched with the positioning hole on the handle, so that the planet carrier and the handle can rotate as a whole. The sun gear is meshed with the control gear on the handle and is also meshed with the planetary gear on the planet carrier; the inner gear ring is meshed with the planetary gear, is provided with a hole and can be connected with a hole on the connecting disc through a bolt so as to enable the inner gear ring and the connecting disc to axially rotate as a whole.
The Chinese invention patent 'a torque-variable torque wrench' (publication number: CN109514473A) discloses a torque-variable torque wrench, which mainly comprises a force application rod and an output piece, wherein a torque-variable component is arranged between the force application rod and the output piece. The torque conversion assembly is an improved differential assembly and particularly mainly comprises a shell, a planetary gear shaft, a planetary gear, an output gear and a torque conversion gear. The shell is a quadrilateral component, two opposite surfaces of the quadrilateral component are provided with planetary gear shaft holes, one surface of the other two surfaces is provided with an output gear hole, and the other opposite surface is provided with a torque-converting gear hole. The planet gear shaft penetrates through the planet gear shaft hole and is positioned in the shell, so that the degree of freedom of the planet gear shaft is 0. The two planetary gears are opposite in gear teeth, arranged in the shell and mounted on the planetary gear shaft; the planetary gear may rotate on the planetary gear shaft, or may be fixed so as not to rotate around the planetary gear shaft.
Although the above two patent documents can realize the torque wrench in a variable torque manner, they are not suitable for fastening iron tower bolts in the power transmission line stringing construction process related to the present application.
The Chinese utility model discloses a torque wrench head and ratchet wrench reversing structure (publication number: CN208358662U), which relates to the technical field of ratchet wrench reversing. The structure comprises a wrench head, a gear, a tooth block and a reversing component. The wrench head is provided with a first opening and a second opening. The gear is arranged in the first opening. The reversing assembly comprises a reversing button, a reversing block and an elastic reversing piece, the reversing button is arranged in the second opening and is matched with the tooth block to be connected, one end of the elastic reversing piece is arranged on the reversing block, and the other end of the elastic reversing piece extends into the tooth block. When the reversing button is rotated, the reversing button can drive the reversing block to rotate, so that the elastic reversing piece is elastically deformed to drive the gear block to rotate, and multi-directional reversing is realized. The contact surface of this structure tooth piece and gear is big, and the torsion value is 30% ~ 50% than traditional structure greatly, and the torque wrench head is big owing to take place elastic deformation impact force, can avoid traditional ratchet structure because machining precision and assembly precision influence, and its focus is to the improvement to smooth tooth and the dead phenomenon of card, does not possess the function of two kinds of structural condition that this application can realize.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a novel mechanical torque wrench which has two structural states, can be quickly exchanged according to use occasions, and improves the working efficiency of a locking nut.
In order to solve the technical problems, the invention adopts the technical scheme that:
a novel mechanical torque wrench comprises a driving part, a transmission part and a force application part, wherein the acting force of the driving part is transmitted to the force application part through the transmission part, and the transmission part comprises a first transmission part and a second transmission part which are separately arranged;
when the force acts on the first transmission part, the driving part and the first transmission part form a whole body to transmit the lever;
when the force acts on the second transmission part, the driving part is separated from the first transmission part and is in gear contact with the second transmission part, and the gear transmission for increasing the torsion is carried out.
The driving part comprises a ratchet wrench and a ratchet rotating shaft which is vertical to the ratchet wrench;
the first transmission part comprises a stress application cantilever and a positioning shaft mechanism, the positioning shaft mechanism comprises a positioning rotating shaft, a rotating hand wheel fixedly arranged at the top of the positioning rotating shaft and a positioning lug fixedly arranged at the tail end of the positioning rotating shaft, the right end of the stress application cantilever is provided with a positioning hole corresponding to the positioning rotating shaft and the positioning lug, the tail end of the stress application cantilever is provided with a limiting groove for limiting the positioning lug, and the left end of the stress application cantilever is in rotating fit with the driving part;
the lower end part of the ratchet wheel rotating shaft penetrates through the stress application cantilever, and the tail end of the ratchet wheel rotating shaft is fixedly provided with a driving gear;
a rotating shaft support is also connected between the positioning shaft mechanism and the ratchet rotating shaft, two ends of the rotating shaft support are respectively sleeved on the positioning rotating shaft and the ratchet rotating shaft, and a buffer spring is further sleeved on the ratchet rotating shaft between the rotating shaft support and the stress application cantilever;
the second transmission part comprises sector teeth and a sector tooth backing plate, the sector teeth are arranged on the right side of the sector tooth backing plate and are meshed with the driving gear, the sector teeth and the force application part are arranged concentrically, and the left end of the sector tooth backing plate is in rotating fit with the force application cantilever; the left end of the fan-shaped tooth backing plate is also fixedly provided with a torsion resisting arm which is fixedly connected with a surrounding fixture;
when acting force is needed to act on the first transmission part, the positioning rotating shaft and the positioning lug penetrate through the positioning hole to reach the limiting groove at the bottom, the driving gear is driven to be downwards separated from the sector gear, then the rotating hand wheel is rotated to limit the positioning lug in the limiting groove, and the ratchet wrench and the stress application cantilever form a whole;
when the required acting force acts on the second transmission part, the hand wheel is rotated reversely to enable the positioning lug to correspond to the positioning hole and to exit from the positioning hole, and meanwhile, under the driving of the reset spring, the driving gear rises to be meshed with the fan-shaped teeth to carry out gear transmission and acts on the force application part through the fan-shaped tooth backing plate.
The force application part is a stepped nut sleeve, the upper end of the nut sleeve is provided with a right-side column body, the specifications of the right-side column body are fixed, the lower end of the nut sleeve is provided with a locking sleeve convenient for positioning a to-be-locked nut, and the locking sleeve is provided with various specifications.
The locking sleeve is of a plum blossom groove structure.
The left end of the stress application cantilever is provided with a connecting sleeve with a plum blossom groove, and the connecting sleeve is clamped on a right square column body at the upper end of the nut sleeve; the lower end part of the connecting sleeve is also provided with a boss for positioning the fan-shaped tooth backing plate.
The regular multi-square column body is an outer hexagonal column body.
The invention has the beneficial effects that:
(1) this novel mechanical type torque wrench through the setting of drive division, first transmission portion, second transmission portion and application of force portion for this mechanical type wrench possesses two kinds of structural condition, can realize the conversion of initial little torsion's demand and follow-up big torsion, has improved the work efficiency of screwing of treating lock nut.
(2) The outer hexagon at the upper end of the nut sleeve is matched with the connecting sleeve at the left end of the stress application cantilever to be rotationally arranged, the plum blossom grooves at the lower end of the nut sleeve are set to be different in specification, when nuts of different sizes are screwed, only the connecting sleeve needs to be replaced, and the universality of the mechanical torque wrench is improved.
(3) This novel mechanical type torque wrench links together each part through the mode of the lantern ring to realize the change of two kinds of structural condition of first transmission portion and second transmission portion through location axle mechanism, make lever transmission and gear transmission conversion convenient and fast, improve the locking effect to the nut.
Drawings
Fig. 1 is a structural state diagram of a first state of the torque wrench.
Fig. 2 is a structural state diagram of a first state of the torque wrench.
Fig. 3 is a partial three-dimensional schematic view of the present invention.
Figure 4 is a three-dimensional schematic of a force applying cantilever.
Fig. 5 is a bottom schematic view of a force applying cantilever.
Fig. 6 is a structural state diagram of the nut socket.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
The invention provides a novel mechanical torque wrench, which is shown in figures 1 to 6.
The novel mechanical torque wrench comprises a driving part, a transmission part and a force application part, wherein the acting force of the driving part is transmitted to the force application part through the transmission part, and the transmission part comprises a first transmission part and a second transmission part which are arranged separately;
when the force acts on the first transmission part, the driving part and the first transmission part form a whole body to transmit the lever; when the force acts on the second transmission part, the driving part is separated from the first transmission part and is in gear contact with the second transmission part, and the gear transmission for increasing the torsion is carried out.
The driving part comprises a ratchet wrench 1 and a ratchet rotating shaft 2 which is vertical to the ratchet wrench 1;
the first transmission part comprises a stress application cantilever 3 and a positioning shaft mechanism 4, the positioning shaft mechanism 4 comprises a positioning rotating shaft 41, a rotating hand wheel 42 fixedly arranged at the top of the positioning rotating shaft and a positioning lug 43 fixedly arranged at the tail end of the positioning rotating shaft, the right end of the stress application cantilever 3 is provided with a positioning hole 31 corresponding to the positioning rotating shaft 41 and the positioning lug 43, the tail end of the stress application cantilever is provided with a limiting groove 32 for limiting the positioning lug, and the left end of the stress application cantilever 3 is in running fit with the transmission part;
the lower end part of the ratchet wheel rotating shaft 2 passes through the stress application cantilever 3, and the tail end of the ratchet wheel rotating shaft is fixedly provided with a driving gear 5;
a rotating shaft support 44 is further connected between the positioning shaft mechanism 4 and the ratchet wheel rotating shaft 2, two ends of the rotating shaft support 44 are respectively sleeved on the positioning rotating shaft 41 and the ratchet wheel rotating shaft 2, and a buffer spring 21 is further sleeved on the ratchet wheel rotating shaft 2 between the rotating shaft support 44 and the stress application cantilever 3.
The second transmission part comprises a fan-shaped tooth 6 and a fan-shaped tooth backing plate 7, the fan-shaped tooth 6 is arranged on the right side of the fan-shaped tooth backing plate 7 and is meshed with the driving gear 5, the fan-shaped tooth 6 and the force application part 8 are arranged concentrically, and the left end of the fan-shaped tooth backing plate 7 is in running fit with the force application cantilever 3; the left end of the fan-shaped tooth backing plate 7 is further fixedly provided with a torsion resisting arm 9, the torsion resisting arm 9 is fixedly connected with surrounding fixed objects, the stability is improved, the fan-shaped tooth 6 is guaranteed to be in a fixed state, and the effect of increasing the torsion through gear transmission is achieved.
In this embodiment, the force application portion 8 is a stepped nut sleeve, and the upper end of the nut sleeve is set as a right-polygonal column 81, preferably, the right-polygonal column is an outer hexagonal column, and the lower end thereof is set with a locking sleeve 82 for positioning a nut to be locked, where the locking sleeve 82 is a quincuncial groove structure. The left end of the stress application cantilever 3 is provided with a connecting sleeve 33 with a plum blossom groove structure, and the connecting sleeve 33 is rotatably sleeved on an outer hexagonal column body of the nut sleeve; the lower end of the connecting sleeve 33 is also provided with a boss 311 for positioning the sector-shaped tooth pad 7.
The specification of outer hexagonal cylinder body sets up with the cooperation of connecting sleeve 33, and the plum blossom groove structure of locking sleeve 82 establishes to different specifications, and convenient quick treating lock nut counterpoints to can realize locking the nut of not unidimensional, when the nut to different specifications is locked, only need change the nut sleeve can.
When acting force is needed to act on the first transmission part, namely initially, the locking nut does not need too much force, and the torque for increasing screwing is not needed to be transmitted by using a gear, so that the structural state of the first torque wrench state is used, namely; the positioning rotating shaft 41 and the positioning lug 43 only need to penetrate through the positioning hole 31 to the limiting groove 32 at the bottom, the angle is rotated, the positioning lug 43 is clamped in the limiting groove, the driving gear 5 is driven to be downwards separated from the sector-shaped teeth 6, then the rotating hand wheel 42 is rotated to limit the positioning lug 43 in the limiting groove 32, the ratchet wrench 1 and the stress application cantilever 3 form a whole, the effect of increasing the force arm is achieved, and the to-be-locked nut is screwed.
When rotating to the bottom and needing bigger screwing force, when needing the effort to act on the second transmission part, use the structural state of this torque wrench state two, promptly: the hand wheel 42 is rotated reversely to make the positioning lug 43 correspond to the positioning hole 31 and exit from the positioning hole 31, meanwhile, under the driving of the reset spring 21, the driving gear 5 rises to be meshed with the sector teeth 6 to perform gear transmission, and acts on the connecting sleeve 33 of the stress application cantilever 3 through the sector teeth backing plate 7, and then acts on the force application part 8 which is a nut sleeve concentrically arranged with the sector teeth 6, so that the amplification of the torsion is realized, and the higher locking effect of the nut to be locked is achieved.
When in specific use, the mechanical torque wrench has the following operation steps:
1) firstly, selecting a nut sleeve with a proper specification according to the size of a nut to be locked;
2) correspondingly matching the first transmission part and the second transmission part with the nut sleeve to form a mechanical torque wrench, sleeving the mechanical torque wrench on a nut to be locked through a plum blossom groove at the lower end of the nut sleeve, and then fixedly connecting the anti-torque arm 9 with surrounding fixtures;
firstly, the connecting sleeve 33 of the stressing cantilever 3 is sleeved on an outer hexagonal column at the upper end of the nut sleeve, then, the left end of the fan-shaped tooth backing plate 7 is correspondingly and rotatably arranged on a boss 311 at the lower end part of the stressing cantilever connecting sleeve 33, the fan-shaped teeth 6 and the nut sleeve are concentrically arranged, and finally, the nut to be locked is correspondingly sleeved on the nut to be locked through a plum blossom groove structure arranged at the lower end of the nut sleeve.
3) Aligning the positions, enabling a positioning rotating shaft 41 and a positioning lug 43 of the first transmission part to penetrate through a positioning hole 31 to a limiting groove 32 at the bottom, then rotating a rotating hand wheel 42 to enable the positioning lug 43 to be limited in the limiting groove 32, enabling a driving gear 5 to be separated from a sector-shaped tooth 6, enabling a ratchet wrench 1 and a stress application cantilever 3 to form a whole to form a structural state of a torque wrench state I, and then enabling the ratchet wrench 1 to be rotated to lock a nut to be locked;
4) when the handle of the ratchet wrench 1 is rotated laboriously, the hand wheel 42 is rotated reversely to enable the positioning lug 43 to correspond to the positioning hole 31 and to withdraw from the positioning hole 31, and the driving gear 5 rises to be meshed with the sector gear 6 to perform gear transmission, so that the structural state of a second torque wrench state is formed, the amplification of torque is realized, and a higher locking effect on the nut is achieved.
Where the words "first", "second", etc. are used in this patent to define parts, those skilled in the art will recognize that: the use of "first" and "second" is merely for convenience in describing the invention and to simplify the description, and the words are not intended to have a special meaning.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents.
In the description of the present invention, it is to be understood that the terms "front", "rear", "left", "right", "center", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the scope of the present invention.
Claims (6)
1. A novel mechanical torque wrench is characterized in that: the device comprises a driving part, a transmission part and a force application part, wherein the acting force of the driving part is transmitted to the force application part through the transmission part, and the transmission part comprises a first transmission part and a second transmission part which are separately arranged;
when the force acts on the first transmission part, the driving part and the first transmission part form a whole body to transmit the lever;
when the force acts on the second transmission part, the driving part is separated from the first transmission part and is in gear contact with the second transmission part, and the gear transmission for increasing the torsion is carried out.
2. The novel mechanical torque wrench as claimed in claim 1, wherein: the driving part comprises a ratchet wrench and a ratchet rotating shaft which is vertical to the ratchet wrench;
the first transmission part comprises a stress application cantilever and a positioning shaft mechanism, the positioning shaft mechanism comprises a positioning rotating shaft, a rotating hand wheel fixedly arranged at the top of the positioning rotating shaft and a positioning lug fixedly arranged at the tail end of the positioning rotating shaft, the right end of the stress application cantilever is provided with a positioning hole corresponding to the positioning rotating shaft and the positioning lug, the tail end of the stress application cantilever is provided with a limiting groove for limiting the positioning lug, and the left end of the stress application cantilever is in rotating fit with the driving part;
the lower end part of the ratchet wheel rotating shaft penetrates through the stress application cantilever, and the tail end of the ratchet wheel rotating shaft is fixedly provided with a driving gear;
a rotating shaft support is also connected between the positioning shaft mechanism and the ratchet rotating shaft, two ends of the rotating shaft support are respectively sleeved on the positioning rotating shaft and the ratchet rotating shaft, and a buffer spring is further sleeved on the ratchet rotating shaft between the rotating shaft support and the stress application cantilever;
the second transmission part comprises sector teeth and a sector tooth backing plate, the sector teeth are arranged on the right side of the sector tooth backing plate and are meshed with the driving gear, the sector teeth and the force application part are arranged concentrically, and the left end of the sector tooth backing plate is in rotating fit with the force application cantilever; the left end of the fan-shaped tooth backing plate is also fixedly provided with a torsion resisting arm which is fixedly connected with a surrounding fixture;
when acting force is needed to act on the first transmission part, the positioning rotating shaft and the positioning lug penetrate through the positioning hole to reach the limiting groove at the bottom, the driving gear is driven to be downwards separated from the sector gear, then the rotating hand wheel is rotated to limit the positioning lug in the limiting groove, and the ratchet wrench and the stress application cantilever form a whole;
when the required acting force acts on the second transmission part, the hand wheel is rotated reversely to enable the positioning lug to correspond to the positioning hole and to exit from the positioning hole, and meanwhile, under the driving of the reset spring, the driving gear rises to be meshed with the fan-shaped teeth to carry out gear transmission and acts on the force application part through the fan-shaped tooth backing plate.
3. The novel mechanical torque wrench as claimed in claim 2, wherein: the force application part is a stepped nut sleeve, the upper end of the nut sleeve is provided with a right-side column body, the specifications of the right-side column body are fixed, the lower end of the nut sleeve is provided with a locking sleeve convenient for positioning a to-be-locked nut, and the locking sleeve is provided with various specifications.
4. The novel mechanical torque wrench as claimed in claim 3, wherein: the locking sleeve is of a plum blossom groove structure.
5. The novel mechanical torque wrench as claimed in claim 3, wherein: the left end of the stress application cantilever is provided with a connecting sleeve with a plum blossom groove, and the connecting sleeve is clamped on a right square column body at the upper end of the nut sleeve; the lower end part of the connecting sleeve is also provided with a boss for positioning the fan-shaped tooth backing plate.
6. The novel mechanical torque wrench as claimed in claim 3, wherein: the regular multi-square column body is an outer hexagonal column body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911161907.5A CN110682241A (en) | 2019-11-25 | 2019-11-25 | Novel mechanical torque wrench |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911161907.5A CN110682241A (en) | 2019-11-25 | 2019-11-25 | Novel mechanical torque wrench |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110682241A true CN110682241A (en) | 2020-01-14 |
Family
ID=69117503
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911161907.5A Pending CN110682241A (en) | 2019-11-25 | 2019-11-25 | Novel mechanical torque wrench |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110682241A (en) |
-
2019
- 2019-11-25 CN CN201911161907.5A patent/CN110682241A/en active Pending
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