CN100526822C - Method for measuring agricultural machine rotary part output horsepower - Google Patents
Method for measuring agricultural machine rotary part output horsepower Download PDFInfo
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- CN100526822C CN100526822C CNB2008101012388A CN200810101238A CN100526822C CN 100526822 C CN100526822 C CN 100526822C CN B2008101012388 A CNB2008101012388 A CN B2008101012388A CN 200810101238 A CN200810101238 A CN 200810101238A CN 100526822 C CN100526822 C CN 100526822C
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- rotary part
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- driving wheel
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Abstract
The invention relates to a measuring method of output power of an agricultural machinery rotating member. The method of the invention has the following steps that: a revolution transmitter measures the rotating speed signal of the rotating member, and the measured rotating speed signal is transmitted to an SCM through a cable; a pressure sensor measures the pressure signal of hydraulic liquid, and the measured pressure signal is transmitted to the SCM thorough the cable, wherein, the pressure of the hydraulic liquid is proportionate to a torque outputted by the agricultural machinery rotating member, after being calculated and processed by the SCM, the rotating speed signal and the pressure signal are transmitted to an LCD which displays the output power of the rotating member. The invention has the advantages that the power can be obtained accurately through measuring the oil pressure and the rotating speed by utilizing an SCM measuring system, a speed sensor, and an oil pressure sensor, and the cost is lower.
Description
Technical field
The present invention relates to agricultural machinery, specifically is a kind of measuring method of agricultural machinery rotary part output horsepower.
Background technology
Rotation working part is more in agricultural machinery, and easily produces fault, and for the agricultural machinery rotation working part, power is one of its important parameter.In the course of the work, will occur work efficiency such as complete machine such as fault effects such as obstruction grade,, cause waste if power can not be brought into play the ability to work of complete machine much smaller than rated power if power surpasses rated power.The working environment of agricultural machinery is more abominable, adds that China's agricultural machinery level of processing is not high, and the profit margin of agricultural machinery is little, this brings difficulty for the on-line monitoring of rotation working part power, make machine-spoiled rate higher, the monitoring level is lower, and influences the foundation of agricultural machinery automatic control system from now on.In the use of agricultural machinery, more satisfactory application conditions is exactly the power that tractor driver or control system can monitor crucial rotary part constantly, and then machine is carried out certain adjustment, and the maximum effect of performance machine reduces failure rate.
In actual applications, the power of agricultural machinery rotation working part judges that one is by tractor driver's estimating power by rule of thumb, yet agricultural machinery is used more and more generally now, and type is increasing, only judge that by experience the power difficulty is very big, and be unfavorable for from now on development to robotization control; The 2nd, directly represent power by rotating speed, the monitoring rotating speed is fairly simple, rotating speed can descend when rotary part power surpasses rated power, but when rotating speed is in allowed band, can not determine that rotary part is operated in its power much smaller than the rated power state or at the rated power state, therefore rotating speed can not really react the power of rotary part, just serves as warning; The 3rd, adopt dynamometer to measure, the principle of dynamometer is to measure the rotating speed and the moment of torsion of rotation working part, reflects the size of power with the product of rotating speed and moment of torsion.The measurement of moment of torsion is based on the distortion of rotating shaft, and the rotation working part axle also will bear moment of flexure except bearing torque usually, causes the rotating shaft distortion complicated, is difficult to calculate.And because the material hardness of rotation working part axle commonly used is big, distortion is very little at work, is difficult to measure.So dynamometer commonly used adopts the method for the external elastic shaft of rotation working part to overcome above-mentioned shortcoming, promptly by shaft coupling power is passed on the elastic shaft, by the another one shaft coupling transmission of power is arrived rotation working part again.Because the elastic shaft distortion is bigger, the distortion of measuring elastic shaft by foil gauge is relatively easy.The distortion that records is converted into moment of torsion, and multiplying each other with the moment of torsion that records to draw performance number.The dynamometer mechanism complexity of above-mentioned principle, installation dimension is big, to working environment susceptibility height, costs an arm and a leg, and is applicable to rotation working part power measurement in laboratory or the factory building, and is difficult to be implemented in online installing and using on the agricultural machinery.These make troubles for the measurement of the power of agricultural machinery rotation working part.Therefore at present need a kind of cheaply, method that can online accurate monitoring agricultural machinery rotary part power reduces the failure rate of agricultural machinery, improves the work efficiency of agricultural machinery, reduces tractor driver's labour intensity, and is the robotization control of the agricultural machinery condition that facilitates.
Summary of the invention
Purpose of the present invention just is on the present agricultural machinery dynamometer being installed, the situation of making troubles for on-line measurement agricultural machinery rotation working part power, a kind of measuring method of agricultural machinery rotary part output horsepower is provided, this measuring method is more convenient, expense is cheap, and the information of abundance is provided for the supervisory system of complete machine.
For achieving the above object, technical scheme of the present invention is to adopt a kind of measuring method of agricultural machine rotary part output horsepower, and described method comprises the steps:
S1: measure the tach signal of described rotary part by speed probe, and the tach signal that measures is sent to single-chip microcomputer through cable;
S2: by the pressure signal of hydraulic oil in the hydraulic gear that pressure transducer is measured with described rotary part is connected, and the pressure signal that measures is sent to single-chip microcomputer through cable, wherein, the moment of torsion of the pressure of described hydraulic oil and described agricultural machinery rotary part output is proportional;
S3: described single-chip microcomputer is pressed following computing formula computing with described tach signal and described pressure signal:
P in the formula
w---agricultural machine rotary part output horsepower;
Friction factor between μ---triangular driving band and driving wheel or the follower;
The pressure of p--hydraulic oil;
The driving wheel radius that r---is connected with rotary part;
N---rotary part rotational speed;
Hydraulic fluid pressure acts on the area of piston end surface in the S---oil closed cavity;
The α---triangular driving band angle of wedge;
Wherein, μ, r, S, α are constant, and p, n are the sensor measurement data;
S4: the data of described single-chip microcomputer after with computing are delivered to LCD, and described liquid crystal display displays goes out rotary part output horsepower.
Wherein, described sensor is installed on the hydraulic valve, described hydraulic valve is parts in the hydraulic gear.
Wherein, described hydraulic gear comprises hydraulic cylinder that is installed in power wheel one side and the piston body that is installed in the power wheel opposite side.
Wherein, described piston body is a hollow sleeve, the outer wall of described hollow sleeve is fixedlyed connected with described power wheel, the oil transportation core that can rotate with hydraulic cylinder is housed at the center of described hollow sleeve, described oil transportation core and described hollow sleeve movingly, an end of described oil transportation core is connected with the inner chamber of hydraulic cylinder, the other end of described oil transportation core is connected with an end of adaptor, the other end of described adaptor is connected with an end of oil pipe, and the other end of described oil pipe is connected with hydraulic valve
Wherein, described oil transportation core is being positioned at the hole that is provided with turnover hydraulic oil on the hydraulic cylinder inner cavity chamber section.
Wherein, described power wheel is the driving wheel in the hydraulic gear, described driving wheel is divided into Moving plate and two parts of price fixing, the center of described price fixing is connected with an end of hydraulic cylinder, the center of described Moving plate is connected with the piston body outer wall, one end of the driving shaft in the other end of described hydraulic cylinder and the agricultural machinery gear train is connected, and the other end of described driving shaft is connected with driving wheel.
Wherein, the peripheral edge portion of described driving wheel is made dovetail groove, in described trapezoidal Cao triangular driving band is housed, described triangle travelling belt is connected driving wheel with follower, and the center of described follower is connected with the agricultural machinery rotary part.
Wherein, described agricultural machinery rotary part is output torque when work, described moment of torsion passes to described triangular driving band by follower, described triangular driving band passes to described driving wheel with described moment of torsion, on the dovetail groove inclined-plane of described driving wheel, described moment of torsion initiatively and on the follower is being converted into pressure and friction force, described pressure is broken down into radial pressure and axle pressure on the Moving plate of described driving wheel and price fixing, described axle pressure is applied respectively on described hydraulic cylinder and described piston body, the described radial pressure that acts on hydraulic cylinder and the piston body will cause the variation of oil pressure in the hydraulic cylinder, and the pressure signal of described oil pressure is measured by described pressure transducer.
Advantage of the present invention and beneficial effect are, utilize single chip computer measurement system, speed pickup, oil pressure sensor commonly used, just can accurately draw power by the mensuration to oil pressure, rotating speed, and cost is lower.This brings convenience not only for the measurement of rotation working part power, has also saved the expense of power measurement simultaneously, especially is applicable to the on-line measurement of agricultural machinery rotation working part power, therefore has better economic and is worth.
Description of drawings
Fig. 1 is the stressed schematic diagram of measuring method intermediate cam drive pulley of the present invention;
Fig. 2 is a system architecture schematic diagram of the present invention;
Fig. 3 is a system architecture schematic diagram of the present invention.
Among the figure: 1, hydraulic valve; 2, pressure transducer; 3, oil pipe; 4, cable; 5, single-chip microcomputer; 6, data line, 7, LCD; 8, hydraulic gear; 9, cable; 10, speed probe; 11, rotary part rotating shaft; 12, rotation working part; 13, price fixing; 14, Moving plate; 15, piston body, 16, adaptor; 17, oilhole; 18, oil transportation core, 19, sealing ring; 20, triangular driving band; 21, follower; 22, bearing; 23, driving wheel; 24, oil closed cavity; 25, pressure acting surface; 26, driving wheel; 27, bearing; 28, driving wheel; 29, hydraulic cylinder.
Embodiment
Following examples are used to illustrate the present invention, but are not used for limiting the scope of the invention.
As Fig. 2 and shown in Figure 3, the specific embodiment of the invention is that pressure transducer 2 is installed in the loop of hydraulic valve 1, link to each other with oil closed cavity 24 with oilhole 17 by oil pipe 3, pressure transducer 2 just can accurately measure the pressure of hydraulic oil in the oil closed cavity 24 like this.Hydraulic valve 1 and hydraulic gear 8 can be used to change the rotating speed of rotation working part 12, and speed probe 10 is installed in rotation working part rotating shaft 11 spindle noses, measures its rotary pulse signal rotating speed just.Pressure transducer 2 is joined with single-chip microcomputer 5 by cable 4 and cable 9 respectively with speed probe 10, and single-chip microcomputer 5 joins by data line 6 and LCD 7.
The driving wheel 23 of hydraulic gear of the present invention is installed on the driving shaft 28 by hydraulic cylinder 29 and piston body 15, link to each other with the follower 21 of hydraulic gear on being installed in rotary part rotating shaft 11 by triangular driving band 20, piston body 15 links together with Moving plate 14, can axially move with Moving plate, hydraulic cylinder 29 links together with price fixing 13, transmit triangular driving band and be used for transferring power, also pressure can be passed to hydraulic seal oil pocket 24 simultaneously, oil closed cavity 24 is formed by the grease chamber that forms between hydraulic cylinder 29 and the piston body 15, oilhole 17 is endoporus of oil transportation core 18, oil transportation core 18 is installed in the centre of piston body 15, links to each other with oil pipe 3 by rotatable adaptor 16.The oil mass of oil closed cavity 24 is adjusted by hydraulic valve 1.One side of piston body 15 is to bear the pressure acting surface 25 of hydraulic fluid pressure, the piston body 15 that how much can drive of oil mass moves vertically with Moving plate 14 in the oil closed cavity 24, thereby can change the gear ratio of hydraulic gear, so just can change the rotating speed of rotary part rotating shaft 11.
Measuring method of the present invention is as follows: during rotation working part 12 work, pressure transducer 2 is measured the pressure of the hydraulic oil in the oil closed cavity 24, speed probe 10 is measured rotary part rotating shaft 11 rotating speeds, and import the signal that measures into single-chip microcomputer 5, obtain the pressure P and the rotation speed n of hydraulic oil, the substitution formula
Calculate, finally can draw the output power P of accurate agricultural machinery rotation working part 12
w, and rotating speed and power be presented on the LCD 7.
In the formula: P
w---agricultural machine rotary part output horsepower;
Friction factor between μ---triangular driving band and driving wheel or the follower;
The pressure of p---hydraulic oil;
The driving wheel radius that r---is connected with rotary part;
N---rotary part rotational speed;
Hydraulic fluid pressure acts on the area of piston end surface in the S---oil closed cavity;
The α---triangular driving band angle of wedge.
Among Fig. 1, N is the normal pressure on the dovetail groove inclined-plane of 20 pairs of hydraulic gear driving wheels 23 of triangular driving band.The dovetail groove inclined-plane normal pressure of 20 pairs of Moving plates 14 of triangular driving band can be decomposed into radial component and axial thrust load, and axial thrust load wherein is: N
F=N * COS α.According to the triangular driving band transmission principle, 20 pairs of hydraulic gear driving wheels 23 of triangular driving band are identical with the normal pressure of hydraulic pressure hydraulic gear follower 21, then the axial thrust load and the N of 20 pairs of followers 21 of triangular driving band
FIdentical.The friction force f=μ * N of 20 pairs of hydraulic gear driving wheels 23 of triangular driving band, μ are friction factor.Torque T=f * r that triangular driving band 20 transmits, then
R is a triangular driving band wheel radius.And the power that triangular driving band 20 transmits
Wherein n is a hydraulic gear follower rotational speed.Rotation working part 12 power and rotation speed n and axial force N have so been set up
FBetween funtcional relationship.
Among Fig. 2, the power of rotary part rotating shaft 11 is imported into by driving wheel 26, and hydraulic gear driving wheel 23, the triangular driving band 20 of process hydraulic gear 8 pass to hydraulic gear follower 21.When rotation working part 12 consumed powers increased, moment of torsion increased, by formula
As can be known, the axial force N that bears of hydraulic gear driving wheel 23
FIncrease.
Measuring process of the present invention is to start rotation working part 12 earlier, power on for then single-chip microcomputer 5, open hydraulic valve 1, adjust the oil mass of oil closed cavity 24 according to rotary speed data shown on the LCD 7, when hydraulic oil is injected into oil pocket 24 by oil pipe 3, when perhaps hydraulic oil passes through oilhole 17 oil returns by oil pocket 24, driving piston body 15 moves axially, thereby Moving plate 14 is moved axially, adjust Moving plate 14, gap between the price fixing 13, change hydraulic gear driving wheel 23, ratio of gear between the follower 21 when LCD 7 shown rotating speeds are rotation working part 12 required working speeds, is closed hydraulic valve 1.Set up in Moving plate 14, price fixing 13 gaps at this moment, and hydraulic gear driving wheel 23, passive wheel disc 21 ratio of gear are set up, and hydraulic oil is sealed in the seal oil chamber 24.Pressure
Wherein S oil closed cavity pressure acts on the piston end surface area.As previously mentioned, when rotation working part 12 power increase, the axial force of 20 pairs of hydraulic gear driving wheels 23 of triangular driving band increases, and this axial force affacts on the oil closed cavity 24 by price fixing 13, piston body 15 and hydraulic cylinder cylinder 29, causes sealing hydraulic fluid pressure and increases.Vice versa.On hydraulic valve 1, connect pressure transducer 2, according to formula
Can measure change in torque.Speed probe 10 is installed on rotation working part 12, can measures rotational speed.According to formula
Can calculate rotation working part 12 consumed powers.
Single-chip microcomputer 5 adopts timer conters that the pulse signal of the speed probe 10 that collects is carried out computing among the present invention, measures hydraulic gear driving wheel 23 rotating speeds.Single-chip microcomputer 5 carries out AD conversion with the signal that collects among the present invention, and the rotating speed that collects and the signal of pressure transducer 2 are carried out computing, measures the moment of torsion of hydraulic gear driving wheel 23.5 pairs of single-chip microcomputers collect speed and pressure signal value among the present invention, according to formula
Calculate performance number, be sent on the LCD and show.
The present invention utilizes single chip computer measurement system commonly used, speed pickup, oil pressure pressure transducer, just can accurately draw power by the mensuration to oil pressure, rotating speed, and cost is lower.This brings convenience not only for the measurement of rotation working part power, has also saved the expense of power measurement simultaneously, especially is applicable to the on-line measurement of agricultural machinery rotation working part power, therefore has better economic and is worth.
More than be preferred forms of the present invention, according to content disclosed by the invention, some identical, replacement schemes that those of ordinary skill in the art can expect apparently all should fall into the scope of protection of the invention.
Claims (8)
1, a kind of measuring method of agricultural machine rotary part output horsepower is characterized in that, described method comprises the steps:
S1: measure the tach signal of described rotary part by speed probe, and the tach signal that measures is sent to single-chip microcomputer through cable;
S2: by the pressure signal of hydraulic oil in the hydraulic gear that pressure transducer is measured with described rotary part is connected, and the pressure signal that measures is sent to single-chip microcomputer through cable, wherein, the moment of torsion of the pressure of described hydraulic oil and described agricultural machinery rotary part output is proportional;
S3: described single-chip microcomputer is pressed following computing formula computing with described tach signal and described pressure signal:
P in the formula
W---agricultural machine rotary part output horsepower;
Friction factor between μ---triangular driving band and driving wheel or the follower;
The pressure of p---hydraulic oil;
The driving wheel radius that r---is connected with rotary part;
N---rotary part rotational speed;
Hydraulic fluid pressure acts on the area of piston end surface in the S---oil closed cavity;
The α---triangular driving band angle of wedge;
Wherein, μ, r, S, α are constant, and p, n are the sensor measurement data;
S4: the data of described single-chip microcomputer after with computing are delivered to LCD, and described liquid crystal display displays goes out rotary part output horsepower.
2, the measuring method of agricultural machine rotary part output horsepower as claimed in claim 1 is characterized in that, described sensor is installed on the hydraulic valve in the described hydraulic gear.
3, the measuring method of agricultural machine rotary part output horsepower as claimed in claim 2 is characterized in that, described hydraulic gear comprises hydraulic cylinder that is installed in power wheel one side and the piston body that is installed in the power wheel opposite side.
4, the measuring method of agricultural machine rotary part output horsepower as claimed in claim 3, it is characterized in that, described piston body is a hollow sleeve, the outer wall of described hollow sleeve is fixedlyed connected with described power wheel, the oil transportation core that can rotate with hydraulic cylinder is housed at the center of described hollow sleeve, described oil transportation core and described hollow sleeve are movingly, one end of described oil transportation core is connected with the inner chamber of hydraulic cylinder, the other end of described oil transportation core is connected with an end of adaptor, the other end of described adaptor is connected with an end of oil pipe, and the other end of described oil pipe is connected with hydraulic valve.
5, the measuring method of agricultural machine rotary part output horsepower as claimed in claim 4 is characterized in that, described oil transportation core is being positioned at the hole that is provided with turnover hydraulic oil on the hydraulic cylinder inner cavity chamber section.
6, the measuring method of agricultural machine rotary part output horsepower as claimed in claim 3, it is characterized in that, described power wheel is the driving wheel in the hydraulic gear, described driving wheel is divided into Moving plate and two parts of price fixing, the center of described price fixing is connected with an end of hydraulic cylinder, the center of described Moving plate is connected with the piston body outer wall, and an end of the driving shaft in the other end of described hydraulic cylinder and the agricultural machinery gear train is connected, and the other end of described driving shaft is connected with the agricultural machinery driving wheel.
7, the measuring method of agricultural machine rotary part output horsepower as claimed in claim 6, it is characterized in that, the peripheral edge portion of described driving wheel is made dovetail groove, in described trapezoidal Cao, triangular driving band is housed, described triangle travelling belt is connected driving wheel with follower, the center of described follower is connected with the agricultural machinery rotary part.
8, measuring method as the described agricultural machine rotary part output horsepower of the arbitrary claim of claim 2 to 7, it is characterized in that, described agricultural machinery rotary part is output torque when work, described moment of torsion passes to described triangular driving band by follower, described triangular driving band passes to described driving wheel with described moment of torsion, on the dovetail groove inclined-plane of described driving wheel, described moment of torsion initiatively and on the follower is being converted into pressure and friction force, described pressure is broken down into radial pressure and axle pressure on the Moving plate of described driving wheel and price fixing, described axle pressure is applied respectively on described hydraulic cylinder and described piston body, the described radial pressure that acts on hydraulic cylinder and the piston body will cause the variation of oil pressure in the hydraulic cylinder, and the pressure signal of described oil pressure is measured by described pressure transducer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2008101012388A CN100526822C (en) | 2008-02-29 | 2008-02-29 | Method for measuring agricultural machine rotary part output horsepower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2008101012388A CN100526822C (en) | 2008-02-29 | 2008-02-29 | Method for measuring agricultural machine rotary part output horsepower |
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| Publication Number | Publication Date |
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| CN101231201A CN101231201A (en) | 2008-07-30 |
| CN100526822C true CN100526822C (en) | 2009-08-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2008101012388A Expired - Fee Related CN100526822C (en) | 2008-02-29 | 2008-02-29 | Method for measuring agricultural machine rotary part output horsepower |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103994891B (en) * | 2014-05-13 | 2016-08-17 | 安徽农业大学 | Moment of torsion and power detection device for air-powered motor |
| CN104089773B (en) * | 2014-07-23 | 2016-07-13 | 江苏大学 | Reel sprinkling irrigation machine transmission system efficiency assay device and method |
| CN104977622B (en) * | 2015-06-30 | 2018-02-27 | 江苏大学 | A kind of reel sprinkling irrigation machine PE tube layer number detection means |
| EP3118601B1 (en) * | 2015-07-15 | 2018-04-18 | Peng Cheng | Torque sensor |
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Granted publication date: 20090812 Termination date: 20120229 |