CN109932034B - Weighing method of middle-mounted shaft vehicle-mounted weighing mechanism - Google Patents
Weighing method of middle-mounted shaft vehicle-mounted weighing mechanism Download PDFInfo
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- CN109932034B CN109932034B CN201910154929.2A CN201910154929A CN109932034B CN 109932034 B CN109932034 B CN 109932034B CN 201910154929 A CN201910154929 A CN 201910154929A CN 109932034 B CN109932034 B CN 109932034B
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Abstract
A weighing method of a mid-set shaft vehicle-mounted weighing mechanism comprises the following steps that the weighing mechanism consists of a controller, a connecting plate frame assembly, a mid-set shaft traction pin, a force measuring sensor, a lever pin and a force transmission plate assembly on a vehicle, wherein the force measuring sensor is connected with the controller; the method is characterized in that: the distance between the force measuring sensor and the lever pin is A; the distance from the lever pin to the middle shaft traction pin is B; the stress at the force sensor is f; the actual kingpin force magnitude is F = F × (a/B). The invention has simple structure and convenient use, and further prevents the accident that the trailer is separated from the connecting part due to damage.
Description
Technical Field
The invention relates to the technical field of truck scales, in particular to a weighing method of a middle-axle vehicle-mounted weighing mechanism.
Background
At present, the middle-mounted axle trailer belongs to new things in China, and has the advantages that the center of gravity is reduced, the middle-mounted axle trailer is more stable than a full trailer when running at a high speed, and the middle-mounted axle trailer is more suitable for rapid throwing and hanging type logistics of a trunk line; the structure of the middle shaft trailer is simpler, the load is stable, and the lightweight design is easier to break through; the reversing principle of the semitrailer is approximately the same as that of a semitrailer, and the reversing problem is not needed to be worried about.
The central shaft trailer traction rod and the trailer are designed into a whole and are connected with a traction pin additionally arranged below the vehicle frame. Due to the special balance structure, when the central axle trailer is matched with the main vehicle to run, the main vehicle also bears smaller trailer weight, but GB/T3730.1-2001 mentions that the load weight is not more than 10% or 1000N. Because the draw bar is rigidly connected with the trailer, the draw bar cannot swing up and down, and if the vehicle runs on a road section with large fluctuation for a long time, the traction pin part has overlarge load, and the accident that the trailer is separated from the connection part by damage can occur.
Disclosure of Invention
In view of the above defects, the invention aims to provide a weighing method of a mid-axle vehicle-mounted weighing mechanism, which has a simple structure and is convenient to use, and further prevents the accident that a trailer is broken off due to damage of a connecting part.
The technical scheme adopted by the invention is as follows: a weighing method of a mid-set shaft vehicle-mounted weighing mechanism comprises the following steps that the weighing mechanism consists of a controller, a connecting plate frame assembly, a mid-set shaft traction pin, a force measuring sensor, a lever pin and a force transmission plate assembly on a vehicle, wherein the force measuring sensor is connected with the controller; the method is characterized in that: the distance between the force measuring sensor and the lever pin is A; the distance from the lever pin to the middle shaft traction pin is B; the stress at the force sensor is f; the actual towing pin force magnitude is F = F x (A/B); the right end of the connecting plate frame assembly is provided with a left supporting plate and a right supporting plate, the force measuring sensor and the lever pin are movably connected between the left supporting plate and the right supporting plate, the lever pin is positioned on the right side of the force measuring sensor, and the middle part of the force measuring sensor is provided with two strain areas; the force transmission plate assembly is fixed at the left end of the middle shaft traction pin, and is provided with a force transmission plate which is movably connected to the middle parts of the force sensor and the lever pin; when the traction rod of the central shaft trailer is connected with the trailer through the traction pin of the central shaft; the central shaft trailer traction rod drives the trailer to run; the connecting plate frame component is pressed down by the gravity of the trailer part; rotating the connecting plate carrier assembly about the lever pin; applying a downward force to the load cell; meanwhile, the traction pin of the middle shaft is pressed down by the gravity of the traction rod part of the trailer of the middle shaft; rotating the central shaft traction pin around the lever pin; applying an upward force to two strain zones of a load cell; the two strain zones are caused to change by two opposing forces; a chip assembly arranged in the force transducer is used for receiving and processing the strain area to generate an electric signal; then transmitting to a controller; and the controller calculates the stress value at the traction pin according to the electric signal.
The controller is also provided with an alarm device, a force value range to be monitored is set on the controller, and when the actual stress at the position of the central shaft traction pin exceeds the set force value range, the controller starts the alarm device to give an alarm.
The connecting plate frame assembly is provided with a front sealing plate, a left supporting plate and a right supporting plate, a sensor shaft sleeve I and a lever pin shaft sleeve I are arranged on the left supporting plate and the right supporting plate from left to right, and the left supporting plate and the right supporting plate are symmetrically fixed on the front sealing plate; the two force transmission plates are fixedly connected with each other through a sensor shaft sleeve II and a lever pin shaft sleeve II; the front sealing plate is provided with a connecting through hole, the two force transmission plates of the force transmission plate assembly penetrate through the connecting through hole and are positioned between the left supporting plate and the right supporting plate, the sensor shaft sleeve II on the force transmission plate assembly is positioned between the two sensor shaft sleeves I, and a gap is formed between the sensor shaft sleeve II and the sensor shaft sleeve I; the lever pin shaft sleeve II is positioned between the two lever pin shaft sleeves I, and a gap is formed between the lever pin shaft sleeve II and the lever pin shaft sleeve I; one end of the force sensor sequentially passes through the sensor shaft sleeve I, the sensor shaft sleeve II and the sensor shaft sleeve I and is fixed through a fixing piece arranged on one sensor shaft sleeve I; the two strain areas on the force sensor are respectively positioned at two ends of the sensor shaft sleeve II; one end of the lever pin sequentially passes through the lever pin shaft sleeve I, the lever pin shaft sleeve II and the lever pin shaft sleeve I, and the other end of the lever pin is fixed on the right supporting plate through a fixing piece.
The left support plate is provided with two through holes, the sensor shaft sleeve I is fixed in the through hole at the left end through a welding process, and the lever pin shaft sleeve I is fixed in the through hole at the right end through a welding process; the force transmission plate assembly is fixed at the left end of the middle shaft traction pin through a bolt, two force transmission plates are fixed through a welding process, triangular reinforcing feet are arranged on the outer sides of the two force transmission plates, and the force transmission plates are better in connection fastness through the triangular reinforcing feet; the sensor shaft sleeve II is connected between the through holes at the left ends of the two force transmission plates and is fixed through a welding process; the lever pin shaft sleeve I is connected between the through holes at the right ends of the two force transmission plates and fixed through a welding process, so that the production efficiency is improved, and meanwhile, the quality consistency is conveniently controlled.
The connecting plate frame assembly further comprises an upper sealing plate, a lower sealing plate and two side plates; the upper sealing plate is fixed above the front sealing plate, the lower sealing plate is fixed below the front sealing plate, the two side plates are respectively fixed on the left side and the right side of the front sealing plate, and the force measuring sensor and the lever pin are wrapped by the upper sealing plate, the lower sealing plate and the two side plates; the force measuring sensor and the lever pin are prevented from being collided and scratched in the using process, and the service life is further prolonged.
The upper sealing plate, the lower sealing plate and the two side plates are provided with dismounting holes which are convenient for dismounting the force measuring sensor and the lever pin, so that later-stage maintenance is facilitated.
The distance between the force measuring sensor and the lever pin is a multiple of the distance between the lever pin and the middle shaft traction pin, and calculation is convenient.
The method comprises the following steps: when the middle shaft trailer traction rod is connected with the trailer through the middle shaft traction pin, the middle shaft trailer traction rod drives the trailer to run, and the connecting plate frame assembly is pressed down by the gravity of the trailer part, so that the connecting plate frame assembly rotates around the lever pin and applies downward force to the force measuring sensor; meanwhile, the middle-mounted shaft traction pin is pressed down by the gravity of the traction rod part of the middle-mounted shaft trailer, so that the middle-mounted shaft traction pin rotates around the lever pin and exerts upward force on two strain areas of the force measuring sensor; the two strain areas are changed through two opposite forces, a chip assembly arranged in the force measuring sensor receives and processes the strain areas to generate electric signals, the electric signals are transmitted to a controller, the controller calculates the stress value of the traction pin according to the electric signals, and the calculation method comprises the following steps: the distance from the force measuring sensor to the lever pin is A, the distance from the lever pin to the middle shaft traction pin is B, the stress at the force measuring sensor is F, and the stress of the actual traction pin is F = F x (A/B).
The invention has simple structure and convenient use, and further prevents the accident that the trailer is separated from the connecting part due to damage.
Drawings
Fig. 1 is a front view of the present invention.
Fig. 2 is a perspective view of the present invention.
Fig. 3 is a perspective view of the present invention in an intact state connected to a pallet assembly.
In the figure: 1 is connecting plate frame subassembly, 2 is middle-placed axle towing pin, 3 is force cell, 4 is the lever round pin, 5 is the biography power board subassembly, 6 is sensor axle sleeve I, 7 is lever round pin axle sleeve I, 8 is sensor axle sleeve II, 9 is lever round pin axle sleeve II.
Detailed Description
As shown in fig. 1 and 2, a weighing method of a mid-axle vehicle-mounted weighing mechanism is provided, wherein the weighing mechanism consists of a controller on a vehicle, a connecting plate frame assembly 1, a mid-axle traction pin 2, a force sensor 3, a lever pin 4 and a force transmission plate assembly 5, and the force sensor 3 is connected with the controller; the distance from the force measuring sensor 3 to the lever pin 4 is A; the distance from the lever pin 4 to the middle shaft traction pin 2 is B; the stress at the force sensor 3 is f; the actual towing pin force magnitude is F = F x (A/B); the right end of the connecting plate frame assembly 1 is provided with a left supporting plate 12 and a right supporting plate 13, the force measuring sensor 3 and the lever pin 4 are movably connected between the left supporting plate 12 and the right supporting plate 13, the lever pin 4 is positioned on the right side of the force measuring sensor 3, and the middle part of the force measuring sensor 3 is provided with two strain areas; the force transmission plate assembly 5 is fixed at the left end of the middle shaft traction pin 2, a force transmission plate 51 is arranged on the force transmission plate assembly 5, and the force transmission plate 51 is movably connected to the middle parts of the force sensor 3 and the lever pin 4; when the traction rod of the central shaft trailer is connected with the trailer through the central shaft traction pin 2; the central shaft trailer traction rod drives the trailer to run; the connecting plate frame component 1 is pressed down by the gravity of the trailer part; causing the link plate carrier assembly 1 to rotate about the lever pin 4; applying a downward force to the load cell 3; meanwhile, the middle-mounted shaft traction pin 2 is pressed down by the gravity of the traction rod part of the middle-mounted shaft trailer; the middle shaft traction pin 2 rotates around the lever pin 4; applying an upward force to the two strain zones of the load cell 3; the two strain zones are caused to change by two opposing forces; a chip component arranged in the force transducer 3 receives and processes the strain area to generate an electric signal; then transmitting to a controller; and the controller calculates the stress value at the traction pin according to the electric signal. The controller on still be equipped with alarm device, set for the power value scope that needs the control on the controller, when the actual atress of central spindle towing pin 2 department exceeded the set power value scope, the controller starts alarm device and reports to the police. The connecting plate frame assembly 1 is provided with a front sealing plate 11, a left supporting plate 12 and a right supporting plate 13, the left supporting plate 12 and the right supporting plate 13 are respectively provided with a sensor shaft sleeve I6 and a lever pin shaft sleeve I7 from left to right, and the left supporting plate 12 and the right supporting plate 13 are fixed on the front sealing plate 11 in a structure symmetry manner; the two force transmission plates 51 are arranged on the force transmission plate assembly 5, and the two force transmission plates 51 are fixedly connected with each other through a sensor shaft sleeve II 8 and a lever pin shaft sleeve II 9; the front sealing plate 11 is provided with a connecting through hole, the two force transmission plates 51 of the force transmission plate assembly 5 penetrate through the connecting through hole and are positioned between the left supporting plate 12 and the right supporting plate 13, the sensor shaft sleeve II 8 on the force transmission plate assembly is positioned between the two sensor shaft sleeves I6, and a gap is formed between the sensor shaft sleeve II 8 and the sensor shaft sleeve I6; the lever pin shaft sleeve II 9 is positioned between the two lever pin shaft sleeves I7, and a gap is formed between the lever pin shaft sleeve II 9 and the lever pin shaft sleeve I7; one end of the force measuring sensor 3 sequentially passes through a sensor shaft sleeve I6, a sensor shaft sleeve II 8 and a sensor shaft sleeve I6 and is fixed through a fixing piece arranged on one sensor shaft sleeve I6; the two strain areas on the force measuring sensor 3 are respectively positioned at two ends of the sensor shaft sleeve II 8; one end of the lever pin 4 sequentially passes through the lever pin shaft sleeve I7, the lever pin shaft sleeve II 9 and the lever pin shaft sleeve I7, and the other end of the lever pin is fixed on the right supporting plate 13 through a fixing piece. The left support plate 12 on be equipped with two through-holes, sensor axle sleeve I6 passes through welding process to be fixed in the through-hole of left end, lever pin axle sleeve I7 passes through welding process to be fixed in the through-hole of right-hand member. The force transmission plate assembly 5 is fixed at the left end of the middle shaft traction pin 2 through a bolt, two force transmission plates 51 are fixed through a welding process, triangular reinforcing feet are arranged on the outer sides of the two force transmission plates 51, and the force transmission plates 51 are better in connection fastness through the triangular reinforcing feet; the force transmission plate 51 is provided with two through holes corresponding to the two through holes on the left support plate 12, and the sensor shaft sleeve II 8 is connected between the through holes at the left ends of the two force transmission plates 51 and is fixed through a welding process; the lever pin shaft sleeve I7 is connected between the through holes at the right ends of the two force transmission plates 51 and is fixed through a welding process, so that the production efficiency is improved, and meanwhile, the quality consistency is conveniently controlled. The connecting plate frame assembly 1 further comprises an upper sealing plate 14, a lower sealing plate 15 and two side plates 16; go up shrouding 14 and fix the top at preceding shrouding 11, lower shrouding 15 is fixed in the below of preceding shrouding 11, and two curb plates 16 are fixed respectively in the left side and the right side of preceding shrouding 11, wrap up load cell 3 and lever round pin 4 through last shrouding 14, lower shrouding 15, two curb plates 16.
The upper sealing plate 14, the lower sealing plate 15 and the two side plates 16 are provided with dismounting holes which are convenient for dismounting the force measuring sensor 3 and the lever pin 4. The distance between the load cell 3 and the lever pin 4 is a multiple of the distance between the lever pin 4 and the middle shaft traction pin 2.
The method comprises the following use processes: when the traction rod of the central shaft trailer is connected with the trailer through the traction pin 2 of the central shaft, the traction rod of the central shaft trailer drives the trailer to run, and the connecting plate frame assembly 1 is pressed down by the gravity of the trailer part, so that the connecting plate frame assembly 1 rotates around the lever pin 4 to apply downward force to the force measuring sensor 3; meanwhile, the middle-mounted shaft traction pin 2 is pressed down by the gravity of the traction rod part of the middle-mounted shaft trailer, so that the middle-mounted shaft traction pin 2 rotates around the lever pin 4 to apply upward force to two strain areas of the force measuring sensor 3; the two strain areas are changed through two opposite forces, a chip assembly arranged in the force measuring sensor 3 receives and processes the strain areas to generate electric signals, the electric signals are transmitted to a controller, the controller calculates the stress value of the traction pin according to the electric signals, and the calculation method comprises the following steps: the distance from the force measuring sensor 3 to the lever pin 4 is A, the distance from the lever pin 4 to the middle shaft traction pin 2 is B, the stress at the position of the force measuring sensor 3 is F, and the stress of the actual traction pin is F = fx (A/B); the real-time loading capacity of the truck can be obtained, when the real-time loading capacity calculated by the controller exceeds a value set in the controller, the controller starts the alarm device to give an alarm, and the accident that the trailer is broken away from the connecting part is further prevented.
The invention has simple structure and convenient use, and can further prevent the accident that the trailer is separated from the connecting part due to damage.
Claims (8)
1. A weighing method of a mid-axle vehicle-mounted weighing mechanism comprises the steps that the weighing mechanism consists of a controller, a connecting plate frame assembly (1), a mid-axle traction pin (2), a force measuring sensor (3), a lever pin (4) and a force transmission plate assembly (5) which are arranged on a vehicle, wherein the force measuring sensor (3) is connected with the controller; the method is characterized in that: the distance from the force measuring sensor (3) to the lever pin (4) is A; the distance from the lever pin (4) to the middle shaft traction pin (2) is B; the stress at the force sensor (3) is f; the actual towing pin force magnitude is F = F x (A/B); a left support plate (12) and a right support plate (13) are arranged at the right end of the connecting plate frame assembly (1), the force measuring sensor (3) and the lever pin (4) are movably connected between the left support plate (12) and the right support plate (13), the lever pin (4) is positioned on the right side of the force measuring sensor (3), and two strain areas are arranged in the middle of the force measuring sensor (3); the force transmission plate assembly (5) is fixed at the left end of the middle shaft traction pin (2), a force transmission plate (51) is arranged on the force transmission plate assembly (5), and the force transmission plate is movably connected to the middle parts of the force sensor (3) and the lever pin (4) through the force transmission plate (51); when the traction rod of the central shaft trailer is connected with the trailer through the central shaft traction pin (2); the central shaft trailer traction rod drives the trailer to run; the connecting plate frame assembly (1) is pressed down by the gravity of the trailer part; rotating the link plate carrier assembly (1) about the lever pin (4); applying a downward force to the load cell (3); meanwhile, the middle-mounted shaft traction pin (2) is pressed down by the gravity of the traction rod part of the middle-mounted shaft trailer; the middle shaft traction pin (2) rotates around the lever pin (4); applying an upward force to the two strain zones of the load cell (3); the two strain zones are caused to change by two opposing forces; a chip component arranged in the force measuring sensor (3) is used for receiving and processing the strain area to generate an electric signal; then transmitting to a controller; and the controller calculates the stress value at the traction pin according to the electric signal.
2. The weighing method of the centrally-mounted axle vehicle-mounted weighing mechanism according to claim 1, characterized in that: the controller is also provided with an alarm device, a force value range needing to be monitored is set on the controller, and when the actual stress at the middle shaft traction pin (2) exceeds the set force value range, the controller starts the alarm device to give an alarm.
3. The weighing method of the centrally-mounted axle vehicle-mounted weighing mechanism according to claim 1, characterized in that: the connecting plate frame assembly (1) is provided with a front sealing plate (11), a left supporting plate (12) and a right supporting plate (13), the left supporting plate (12) and the right supporting plate (13) are respectively provided with a sensor shaft sleeve I (6) and a lever pin shaft sleeve I (7) from left to right, and the left supporting plate (12) and the right supporting plate (13) are symmetrically fixed on the front sealing plate (11); the force transmission plate assembly (5) is provided with two force transmission plates (51), and the two force transmission plates (51) are fixedly connected with each other through a sensor shaft sleeve II (8) and a lever pin shaft sleeve II (9); the front sealing plate (11) is provided with a connecting through hole, two force transmission plates (51) of the force transmission plate assembly (5) penetrate through the connecting through hole and are positioned between the left supporting plate (12) and the right supporting plate (13), a sensor shaft sleeve II (8) on the force transmission plate assembly is positioned between the two sensor shaft sleeves I (6), and a gap is formed between the sensor shaft sleeve II (8) and the sensor shaft sleeve I (6); the lever pin shaft sleeve II (9) is positioned between the two lever pin shaft sleeves I (7), and a gap is formed between the lever pin shaft sleeve II (9) and the lever pin shaft sleeve I (7); one end of the force measuring sensor (3) sequentially passes through the sensor shaft sleeve I (6), the sensor shaft sleeve II (8) and the sensor shaft sleeve I (6) and is fixed through a fixing piece arranged on one sensor shaft sleeve I (6); the two strain areas on the force measuring sensor (3) are respectively positioned at two ends of the sensor shaft sleeve II (8); one end of the lever pin (4) sequentially passes through the lever pin shaft sleeve I (7), the lever pin shaft sleeve II (9) and the lever pin shaft sleeve I (7), and the other end of the lever pin shaft sleeve is fixed on the right support plate (13) through a fixing piece.
4. The weighing method of the centrally-mounted axle vehicle-mounted weighing mechanism according to claim 3, characterized in that: the left support plate (12) on be equipped with two through-holes, sensor axle sleeve I (6) pass through welding process and fix in the through-hole of left end, lever pin axle sleeve I (7) pass through welding process and fix in the through-hole of right-hand member.
5. The weighing method of the centrally-mounted axle vehicle-mounted weighing mechanism according to claim 3, characterized in that: the force transmission plate assembly (5) is fixed at the left end of the middle shaft traction pin (2) through a bolt, two force transmission plates (51) are fixed through a welding process, triangular reinforcing feet are arranged on the outer sides of the two force transmission plates (51), and the force transmission plates (51) are better in connection fastness through the triangular reinforcing feet; the force transmission plate (51) is provided with two through holes corresponding to the two through holes on the left support plate (12), and the sensor shaft sleeve II (8) is connected between the through holes at the left ends of the two force transmission plates (51) and is fixed through a welding process; the lever pin shaft sleeve I (7) is connected between the through holes at the right ends of the two force transmission plates (51) and is fixed through a welding process.
6. The weighing method of the centrally-mounted axle vehicle-mounted weighing mechanism according to claim 3, characterized in that: the connecting plate frame assembly (1) further comprises an upper sealing plate (14), a lower sealing plate (15) and two side plates (16); the upper sealing plate (14) is fixed above the front sealing plate (11), the lower sealing plate (15) is fixed below the front sealing plate (11), the two side plates (16) are respectively fixed on the left side and the right side of the front sealing plate (11), and the force measuring sensor (3) and the lever pin (4) are wrapped by the upper sealing plate (14), the lower sealing plate (15) and the two side plates (16).
7. The weighing method of the centrally-mounted axle vehicle-mounted weighing mechanism according to claim 6, characterized in that: the upper sealing plate (14), the lower sealing plate (15) and the two side plates (16) are provided with dismounting holes which are convenient for dismounting the force measuring sensor (3) and the lever pin (4).
8. The weighing method of the centrally-mounted axle vehicle-mounted weighing mechanism according to claim 1, characterized in that: the distance between the force measuring sensor (3) and the lever pin (4) is a multiple of the distance between the lever pin (4) and the middle shaft traction pin (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910154929.2A CN109932034B (en) | 2019-03-01 | 2019-03-01 | Weighing method of middle-mounted shaft vehicle-mounted weighing mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910154929.2A CN109932034B (en) | 2019-03-01 | 2019-03-01 | Weighing method of middle-mounted shaft vehicle-mounted weighing mechanism |
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| CN109932034A CN109932034A (en) | 2019-06-25 |
| CN109932034B true CN109932034B (en) | 2021-02-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910154929.2A Active CN109932034B (en) | 2019-03-01 | 2019-03-01 | Weighing method of middle-mounted shaft vehicle-mounted weighing mechanism |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110696571B (en) * | 2019-11-07 | 2022-11-01 | 驻马店广大鸿远车业有限公司 | Coupler connecting device and middle-mounted axle trailer using same |
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| DE102004029295A1 (en) * | 2004-06-17 | 2006-02-02 | Deere & Company, Moline | Device for detecting a vertical load |
| US10106002B2 (en) * | 2013-05-22 | 2018-10-23 | Kevin McAllister | Hitch receiver |
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| US10309824B2 (en) * | 2015-02-05 | 2019-06-04 | R. Douglas Fredrickson | Weight sensing vehicle hitch |
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| US3700053A (en) * | 1971-12-06 | 1972-10-24 | Advanced Management Eng & Res | Weight-indicating trailer coupler |
| JPS54142719A (en) * | 1978-04-21 | 1979-11-07 | Golze Richard R | Car body extension mechanism |
| US5306037A (en) * | 1993-03-29 | 1994-04-26 | Robertson Robert L | Mobile home trailer under-vehicle hitch |
| AU2008264181A1 (en) * | 2007-12-24 | 2009-07-09 | Michael Maud | Releasable Tow Hitch |
| CN101549620A (en) * | 2008-04-03 | 2009-10-07 | 中国国际海运集装箱(集团)股份有限公司 | Vehicle train and traction apparatus thereof |
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| CN109932034A (en) | 2019-06-25 |
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