CN107504140A - Rotating tensioning device for transmission chain and land leveller tandem-driving bogie - Google Patents
Rotating tensioning device for transmission chain and land leveller tandem-driving bogie Download PDFInfo
- Publication number
- CN107504140A CN107504140A CN201710833783.5A CN201710833783A CN107504140A CN 107504140 A CN107504140 A CN 107504140A CN 201710833783 A CN201710833783 A CN 201710833783A CN 107504140 A CN107504140 A CN 107504140A
- Authority
- CN
- China
- Prior art keywords
- chain
- hydraulic
- slide
- tensioning slide
- electromagnetic valve
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H7/00—Gearings for conveying rotary motion by endless flexible members
- F16H7/08—Means for varying tension of belts, ropes, or chains
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H7/00—Gearings for conveying rotary motion by endless flexible members
- F16H7/08—Means for varying tension of belts, ropes, or chains
- F16H2007/0802—Actuators for final output members
- F16H2007/0812—Fluid pressure
- F16H2007/0814—Fluid pressure with valves opening on surplus pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H7/00—Gearings for conveying rotary motion by endless flexible members
- F16H7/08—Means for varying tension of belts, ropes, or chains
- F16H2007/0889—Path of movement of the finally actuated member
- F16H2007/0891—Linear path
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
Abstract
The present invention relates to Chain conveyer, to solve the problems, such as that existing Chain conveyer easily occurs to jump tooth, de- chain；A kind of rotating tensioning device for transmission chain is provided, drive sprocket, driven sprocket including rotating in same direction connection by chain, slide and lower tensioning slide are tensioned characterized by further comprising upper tensioning slide, lower tensioning slide, in promotions make to be tensioned slide in the movement of vertical chain top vertical direction and compress chain top downwards or the lower slide that is tensioned is compressed the following double acting hydraulic ram of chain upwards, the hydraulic jack is connected with chain tension control system.Invention increases chain and drive sprocket engagement wrapping angle, add long with the sprocket wheel and the contact area of chain after abrasion, solve chain just or reversion transmission when, driving chain is rocked, skidded, floating, jumping phenomena such as tooth, de- chain, chaindriven reliability is greatly increased, extends the life-span of chain.
Description
Technical field
The present invention relates to a kind of chain drive, more specifically to a kind of rotating tensioning device for transmission chain and puts down
Ground machine tandem-driving bogie.
Background technology
Chain-drive mechanism is of wide application, in engineering machinery, agricultural machinery, forestry machinery, papermaking equipment, petroleum machinery
Deng having application on large scale equipment.Chain conveyer is to belong to a kind of engaged transmission with center flexing part, and it has gear drive concurrently
With the Some features of V belt translation：Sprocket stress is preferable, and bearing capacity is larger；There are certain buffering and damping property；Centre-to-centre spacing
Can portable construction, and have and can work in harsh environments greatly.
Land leveller be it is a kind of be mainly used to complete large area soil smooth and shaping earthmoving equipment, it into
For the special-purpose machinery of smooth construction in the infrastructural projects such as defence engineering, road performance, mine, water conservancy, farmland.Land leveller
Primary drive route is：Engine → torque-converters-transmission assembly → driving-shaft assembly → rear axle drive → tandem-driving bogie → wheel side
Driving → tire assembly.Tandem-driving bogie not only transmits moment of torsion and speed in complete machine, also acts as adjustment and the work of supported weight
With, it may ensure that land leveller complexity road traveling operation when will not run-off the straight, improve the steady of complete machine and work
Efficiency.
Type of belt drive inside tandem-driving bogie is a kind of Chain conveyer, and it by chain-driving by the drive sprocket of a double strand chain
The driven sprocket of arranged on left and right sides, the transmission of moment of torsion and speed is realized, drive land leveller to advance or retreat by tire and made
Industry.Chain conveyer is to belong to a kind of engaged transmission with center flexing part, and it has the Some features of gear drive and V belt translation concurrently：
Sprocket stress is preferable, and bearing capacity is larger；There are certain buffering and damping property；Centre-to-centre spacing can portable construction, and having greatly
It can work in harsh environments.But its shortcoming is mainly：Instantaneous transmission ratio can not be kept constant；There are noise, chain during work
Phenomena such as bar and sprocket wheel odontotripsis rear chain easily occur to jump tooth, de- chain, chain easily de- chain during reverse drive.Passed based on tandem-driving bogie
The arrangement form of dynamic chain, two driving chains in tandem-driving bogie, either complete machine is in advance job state, or retreats and make
In industry state, there are chain rotating forward, the state that another chain reversion coexists.
The content of the invention
The technical problem to be solved in the present invention is easily to occur to jump tooth for existing Chain conveyer, take off the problem of chain, and provides one
Kind rotating tensioning device for transmission chain and the land leveller tandem-driving bogie with the transmission device.
The present invention is such to realize the technical scheme of its purpose：A kind of rotating tensioning device for transmission chain is provided,
Drive sprocket, driven sprocket including rotating in same direction connection by chain, it is characterised in that also including upper tensioning slide, lower tensioning
Slide and lower tensioning slide are tensioned on slide, promotion makes tensioning slide compress downwards in the movement of vertical chain top vertical direction
Chain top makes lower tensioning slide compress the following double acting hydraulic ram of chain, the hydraulic jack and chain upwards
Tight control system connection.
In above-mentioned rotating tensioning device for transmission chain, double acting hydraulic ram is double rod cylinder, the dual-active
The two-piston bar of rod cylinder is fixedly connected with upper tensioning slide and lower tensioning slide respectively, and the upper tensioning slide is located at chain
The upside of top, lower tensioning slide are located at the following downside of chain.
In above-mentioned rotating tensioning device for transmission chain, the chain tension control system include three position four-way electromagnetic valve,
Hydraulic oil container and hydraulic pump, the P hydraulic fluid ports of the three position four-way electromagnetic valve are connected with hydraulic pump, the oil inlet and hydraulic oil of hydraulic pump
Case is connected, and the T hydraulic fluid ports of three position four-way electromagnetic valve are connected with hydraulic oil container, two actuator ports and liquid of three position four-way electromagnetic valve
Compressing cylinder connects.
In above-mentioned rotating tensioning device for transmission chain, accumulation of energy is connected with the P hydraulic fluid port oil circuits of three position four-way electromagnetic valve
Device and or pressure gauge.
In above-mentioned rotating tensioning device for transmission chain, connected between the P hydraulic fluid ports and hydraulic oil container of three position four-way electromagnetic valve
Have overflow valve and or stop valve.
The present invention is such to realize the technical scheme of its purpose：A kind of land leveller tandem-driving bogie, including double strand chain are disclosed
Drive sprocket and rotate in same direction each via chain with drive sprocket and be connected two driven sprockets, it is characterised in that also include pair
Should every chain upper tensioning slide, lower tensioning slide, two promote slide and lower tensioning slide are tensioned on corresponding corresponding
The vertical direction movement of vertical chain top makes tensioning slide on corresponding compress corresponding chain top downwards or slide corresponding lower tensioning
Seat compresses the following double acting hydraulic ram of corresponding chain upwards, and the hydraulic jack is connected with chain tension control system.
During above-mentioned land leveller tandem-driving bogie is put, two double acting hydraulic rams are double rod cylinder, each described double
The two-piston bar of piston rod oil cylinder is fixedly connected with corresponding upper tensioning slide and lower tensioning slide respectively, each upper tensioning
Slide is located at the upside of corresponding chain top, and each lower tensioning slide is located at the following downside of corresponding chain, wherein double piston-rod
The epicoele of oil cylinder and cavity of resorption respectively it is corresponding with the cavity of resorption of another double rod cylinder with epicoele is corresponding connects.
In above-mentioned land leveller tandem-driving bogie, the chain tension control system include three position four-way electromagnetic valve, hydraulic oil container and
Hydraulic pump, the P hydraulic fluid ports of the three position four-way electromagnetic valve are connected with hydraulic pump, and the oil inlet of hydraulic pump is connected with hydraulic oil container, and three
The T hydraulic fluid ports of position four-way solenoid valve are connected with hydraulic oil container, and two actuator ports of three position four-way electromagnetic valve are connected with hydraulic jack.
In above-mentioned land leveller tandem-driving bogie, be connected with the P hydraulic fluid port oil circuits of three position four-way electromagnetic valve accumulator and or pressure
Table.
In above-mentioned land leveller tandem-driving bogie, be connected between the P hydraulic fluid ports and hydraulic oil container of three position four-way electromagnetic valve overflow valve and
Or stop valve.
Compared with prior art, invention increases chain and drive sprocket engagement wrapping angle, adds long with mill by the present invention
The contact area of sprocket wheel and chain after damage, solve chain just or reversion transmission when, driving chain is rocked, skids, floats, jumped
Phenomena such as tooth, de- chain, chaindriven reliability is improved to Mrs, extends the life-span of chain.
Brief description of the drawings
Fig. 1 is the schematic diagram of rotating tensioning device for transmission chain of the present invention.
Fig. 2 is the chaindriven schematic diagram of land leveller tandem-driving bogie in the present invention.
Parts title and sequence number in figure：
Hydraulic oil container 1, oil filter 2, hydraulic pump 3, pressure gauge 4, accumulator 5, stop valve 6, overflow valve 7, three-position four-way valve
Magnetic valve 8, driven sprocket 9, upper tensioning slide 10, lower tensioning slide 11, chain 12, drive sprocket 13, hydraulic jack 14.
Embodiment
Illustrate specific embodiment below in conjunction with the accompanying drawings.
Embodiment one.
As shown in figure 1, rotating tensioning device for transmission chain in the present embodiment include drive sprocket 13, driven sprocket 9,
Double acting hydraulic ram 14；Drive sprocket 13 and driven sprocket 9 rotate in same direction connection by chain 12.In the top of chain 12
Upside is provided with tensioning slide 10, and lower tensioning slide 11 is provided with the following downside of chain 12.Double acting hydraulic ram
14 be double rod cylinder, and the two-piston bar of double rod cylinder is fixed and connected with upper tensioning slide 10 and lower tensioning slide 11 respectively
Connect, the piston moving direction of double acting hydraulic ram and the top of chain 12 or chain are vertical below.Double acting hydraulic ram
Piston when moving down, the upper piston rod of double acting hydraulic ram drives tensioning slide 10 to move down, and upper tensioning is slided
Seat 10, which moves down, compresses chain top.When the piston of double acting hydraulic ram moves up, double acting hydraulic ram
Lower piston rod drives lower tensioning slide 11 to move up, and it is following that lower tensioning slide 11 moves up compression chain.Hydraulic jack with
Chain tension control system connects.
As shown in figure 1, chain tension control system includes three position four-way electromagnetic valve 8, hydraulic oil container 1 and hydraulic pump 3, three
The P hydraulic fluid ports of four way solenoid valve 8 are connected with hydraulic pump 3, and the oil inlet of hydraulic pump 3 is connected with hydraulic oil container 1, three position four-way electromagnetic valve
8 T hydraulic fluid ports are connected with hydraulic oil container 1, two actuator ports of three position four-way electromagnetic valve 8 it is corresponding with the epicoele of hydraulic jack 14 and
Cavity of resorption connects；Accumulator 5, pressure gauge 4, overflow valve 7, stop valve 6 are connected with the P hydraulic fluid port oil circuits of three position four-way electromagnetic valve 8
Deng.Hydraulic pump 3 draw oil and flows through oil filter 2 and entered in accumulator 5 and stored from hydraulic oil container 1, works as pressure
When table numerical value reaches certain design requirement value, you can to stop the work of hydraulic pump 3；When hypertonia, stop valve 6 can be passed through
Carry out pressure release.
In above-mentioned rotating tensioning device for transmission chain, (it that is to say chain just when drive sprocket 13 rotates counterclockwise
Turn), the top of chain 12 is pilled-in selvedge, is slack list below, is now moved towards by three position four-way electromagnetic valve 8 to change pressure oil, three
Position four-way solenoid valve 8 is in right position, and three position four-way electromagnetic valve 8 connects the epicoele of hydraulic jack 14 with hydraulic oil container 1, hydraulic oil
The cavity of resorption of cylinder connects with accumulator 5, and hydraulic oil promotes the piston of hydraulic jack 14 to move up, the lower end piston of hydraulic jack 14
Bar shrinks, and upper end piston rod extends, and drives lower tensioning slide 11 to compress the following of driving chain 12 and makes tensioning slide 10 de-
From the top of driving chain 12, because fluid has demarcated certain pressure value, when the lower tensioning slide of the lower end of hydraulic jack 14 connection
Compression driving chain is tensioned the slack list of driving chain, increases chain and bag is engaged with drive sprocket to stopping after certain position
Angle, the contact area of sprocket wheel and chain after abrasion is added, rock, skidding, improve so as to solve chain rotating forward transmission
Chaindriven reliability, extend the life-span of chain；
(it that is to say that chain inverts) equally when drive sprocket 13 rotates clockwise, now the top of chain 12 is in pine
Side, pilled-in selvedge state being in below, then being moved towards by two-position four-way solenoid valve to change pressure oil, three position four-way electromagnetic valve is in a left side
Position, three position four-way electromagnetic valve connect the cavity of resorption of hydraulic jack with hydraulic oil container, and the epicoele of hydraulic jack connects with accumulator, liquid
Force feed promotes the piston of hydraulic jack to move down, and the upper end piston rod of hydraulic jack shrinks, the elongation of lower end piston rod, in drive
Tensioning slide compresses the top of driving chain and lower tensioning slide is departed from the following of driving chain, when hydraulic jack upper end connects
Upper tensioning slide compress driving chain to stopping after certain position, be tensioned the slack list of driving chain, increase chain and master
Movable sprocket engagement wrapping angle, add the contact area of sprocket wheel and chain after abrasion.
Embodiment two.
Chain conveyer in land leveller tandem-driving bogie is as shown in Fig. 2 its drive sprocket 13 is double strand chain sprocket wheel, in drive sprocket 13
Front side and rear side be each provided with a driven sprocket 9, each driven sprocket 9 is each via a chain 12 and drive sprocket 13
Rotate in same direction connection.Tensioning slide is provided with above the top of front side chain, following lower section is provided with lower tensioning slide,
Upper tensioning slide with it is lower be tensioned slide respectively with the upper piston rod of the double piston-rod hydraulic jack of front side and lower piston rod is corresponding connects
Connect.
Equally it is provided with above the top of rear side chain and is tensioned slide, following lower section is provided with lower tensioning and slided
Seat, upper tensioning slide and lower tensioning slide are corresponding with the upper piston rod and lower piston rod of the double piston-rod hydraulic jack of rear side respectively
Connection.
The epicoele of front side hydraulic jack is connected by pipeline with the cavity of resorption of rear side hydraulic jack, the cavity of resorption of front side hydraulic jack
Connected by pipeline with the epicoele of rear side hydraulic jack, the epicoele and cavity of resorption of front side hydraulic jack and rear side hydraulic jack correspondingly connect
It is connected after connecing with chain tension control system, structural principle and the chain tension in embodiment one of chain tension control system
Control system is identical, and the chain tension process in land leveller tandem-driving bogie is identical with the tensioning process in embodiment one.
In the present embodiment, can after the Electromagnetic Control of three position four-way electromagnetic valve 8 is associated with the forward-reverse shelves of land leveller
Realize the top or following that auto-tensioning chain is corresponded to during sprocket wheel rotating.
Claims (10)
1. a kind of rotating tensioning device for transmission chain, including drive sprocket, the driven sprocket of connection are rotate in same direction by chain,
Characterized by further comprising slide and lower tensioning slide are tensioned in upper tensioning slide, lower tensioning slide, promotion on vertical chain
Side vertical direction movement makes tensioning slide compress chain top downwards or lower tensioning slide is compressed following pair of chain upwards
To acting hydraulic actuator, the hydraulic jack is connected with chain tension control system.
2. rotating tensioning device for transmission chain according to claim 1, it is characterised in that double acting hydraulic ram is
Double rod cylinder, the two-piston bar of the double rod cylinder are fixedly connected with upper tensioning slide and lower tensioning slide respectively,
The upper tensioning slide is located at the upside of chain top, and lower tensioning slide is located at the following downside of chain.
3. rotating tensioning device for transmission chain according to claim 1 or 2, it is characterised in that the chain tension control
System includes three position four-way electromagnetic valve, hydraulic oil container and hydraulic pump, and P hydraulic fluid ports and the hydraulic pump of the three position four-way electromagnetic valve connect
Connecing, the oil inlet of hydraulic pump is connected with hydraulic oil container, and the T hydraulic fluid ports of three position four-way electromagnetic valve are connected with hydraulic oil container, 3-position 4-way
Two actuator ports of magnetic valve are connected with hydraulic jack.
4. rotating tensioning device for transmission chain according to claim 3, it is characterised in that in the P of three position four-way electromagnetic valve
Be connected with hydraulic fluid port oil circuit accumulator and or pressure gauge.
5. rotating tensioning device for transmission chain according to claim 4, it is characterised in that the P oil of three position four-way electromagnetic valve
Mouthful and hydraulic oil container between be connected with overflow valve and or stop valve.
6. a kind of land leveller tandem-driving bogie, including the drive sprocket of double strand chain and rotate in same direction company each via chain and drive sprocket
Connect two driven sprockets, it is characterised in that also include upper tensioning slide, the lower tensioning slide of corresponding every chain, two promotions pair
Should go up to be tensioned slide and lower tensioning slide and move in corresponding vertical chain top vertical direction makes tensioning slide on corresponding downward
Compress corresponding chain top or corresponding lower tensioning slide is compressed the following double acting hydraulic ram of corresponding chain upwards, it is described
Hydraulic jack is connected with chain tension control system.
7. land leveller tandem-driving bogie according to claim 6, it is characterised in that two double acting hydraulic rams are dual-active
Rod cylinder, the two-piston bar of each double rod cylinder are fixed with corresponding upper tensioning slide and lower tensioning slide respectively
Connection, each upper tensioning slide are located at the upside of corresponding chain top, and it is following that each lower tensioning slide is located at corresponding chain
Downside, the wherein epicoele of double rod cylinder and cavity of resorption be corresponding with the cavity of resorption of another double rod cylinder and epicoele pair respectively
It should connect.
8. the land leveller tandem-driving bogie according to claim 6 or 7, it is characterised in that the chain tension control system includes three
Position four-way solenoid valve, hydraulic oil container and hydraulic pump, the P hydraulic fluid ports of the three position four-way electromagnetic valve are connected with hydraulic pump, hydraulic pump
Oil inlet is connected with hydraulic oil container, and the T hydraulic fluid ports of three position four-way electromagnetic valve are connected with hydraulic oil container, two of three position four-way electromagnetic valve
Actuator port is connected with hydraulic jack.
9. land leveller tandem-driving bogie according to claim 8, it is characterised in that on the P hydraulic fluid port oil circuits of three position four-way electromagnetic valve
Be connected with accumulator and or pressure gauge.
10. land leveller tandem-driving bogie according to claim 9, it is characterised in that the P hydraulic fluid ports and hydraulic pressure of three position four-way electromagnetic valve
Be connected between fuel tank overflow valve and or stop valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710833783.5A CN107504140A (en) | 2017-09-15 | 2017-09-15 | Rotating tensioning device for transmission chain and land leveller tandem-driving bogie |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710833783.5A CN107504140A (en) | 2017-09-15 | 2017-09-15 | Rotating tensioning device for transmission chain and land leveller tandem-driving bogie |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107504140A true CN107504140A (en) | 2017-12-22 |
Family
ID=60697410
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710833783.5A Pending CN107504140A (en) | 2017-09-15 | 2017-09-15 | Rotating tensioning device for transmission chain and land leveller tandem-driving bogie |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107504140A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108240435A (en) * | 2018-01-05 | 2018-07-03 | 李涛涛 | A kind of adjustable contactless tensioning apparatus of electromagnetism for chain drive |
| CN108421908A (en) * | 2018-03-13 | 2018-08-21 | 襄阳龙思达智控技术有限公司 | A kind of automation equipment based on fine machine more mold exchange automatically |
| CN112324730A (en) * | 2020-12-22 | 2021-02-05 | 上海神舟精宜汽车测控技术有限公司 | Constant force adjusting and controlling device |
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| CN101941030A (en) * | 2010-09-28 | 2011-01-12 | 无锡洲翔重工科技有限公司 | Chain tensioning device of section bending machine |
| CN202579861U (en) * | 2012-05-30 | 2012-12-05 | 郑州宇通重工有限公司 | Floating type chain tensioning device with self-adaptive positive and negative rotation for stack-turning machine |
| CN203222299U (en) * | 2013-04-16 | 2013-10-02 | 安徽恒源煤电股份有限公司 | Hydraulic tensioning device of belt conveyor |
| CN204385795U (en) * | 2014-12-15 | 2015-06-10 | 湖南三一路面机械有限公司 | A kind of land leveller and rear bridge mechanism thereof |
| CN106762879A (en) * | 2016-12-27 | 2017-05-31 | 青岛中汽特种汽车有限公司 | A kind of helicopter tractor wheel compresses hydraulic system |
-
2017
- 2017-09-15 CN CN201710833783.5A patent/CN107504140A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101941030A (en) * | 2010-09-28 | 2011-01-12 | 无锡洲翔重工科技有限公司 | Chain tensioning device of section bending machine |
| CN202579861U (en) * | 2012-05-30 | 2012-12-05 | 郑州宇通重工有限公司 | Floating type chain tensioning device with self-adaptive positive and negative rotation for stack-turning machine |
| CN203222299U (en) * | 2013-04-16 | 2013-10-02 | 安徽恒源煤电股份有限公司 | Hydraulic tensioning device of belt conveyor |
| CN204385795U (en) * | 2014-12-15 | 2015-06-10 | 湖南三一路面机械有限公司 | A kind of land leveller and rear bridge mechanism thereof |
| CN106762879A (en) * | 2016-12-27 | 2017-05-31 | 青岛中汽特种汽车有限公司 | A kind of helicopter tractor wheel compresses hydraulic system |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108240435A (en) * | 2018-01-05 | 2018-07-03 | 李涛涛 | A kind of adjustable contactless tensioning apparatus of electromagnetism for chain drive |
| CN108240435B (en) * | 2018-01-05 | 2021-04-16 | 巢湖市华鑫输送设备有限公司 | Electromagnetic adjustable non-contact tensioning device for chain transmission |
| CN108421908A (en) * | 2018-03-13 | 2018-08-21 | 襄阳龙思达智控技术有限公司 | A kind of automation equipment based on fine machine more mold exchange automatically |
| CN112324730A (en) * | 2020-12-22 | 2021-02-05 | 上海神舟精宜汽车测控技术有限公司 | Constant force adjusting and controlling device |
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Application publication date: 20171222 |
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