CN1598498A - Float weighing sensor and PID deviation control method for dynamic coeighing - Google Patents
Float weighing sensor and PID deviation control method for dynamic coeighing Download PDFInfo
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- CN1598498A CN1598498A CN 200410024519 CN200410024519A CN1598498A CN 1598498 A CN1598498 A CN 1598498A CN 200410024519 CN200410024519 CN 200410024519 CN 200410024519 A CN200410024519 A CN 200410024519A CN 1598498 A CN1598498 A CN 1598498A
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Abstract
The invention belongs to weight sensing technology field. The flotage weight sensor is made up of flotage balancer, weighing liquid leakage preventing mechanism, shit signal transmitting device and magnetic centering suspending mechanism. It converts the linear relation of gravity value based on the flotage theory into prominent shift value, and outputs with electric signal. It has no technology deficiencies such as slow change and zero point, and sensitivity excursion. The invention also provides a method for flotage weight sensor in PID error control when in dynamic weight metering. What is detected and controlled by the method is error of the weighted material to the set weight in dynamic weighing process. The positive and negative error value measured by the method, they counteracted in the dynamic weighing process, thus the accuracy of weighing can be upgraded greatly.
Description
Technical field
The invention belongs to weight sensing technology field, particularly a kind of buoyant force weighing sensing device that does not have the linear output of technological deficiencies such as creep and zero point, sensitivity drift; Also be particularly related to a kind ofly when being applied to dynamic weighing, be different from the PID deviation closed loop control method of resistance strain weighing transducer.
Background technology
At present, what in weighing technology field widespread usage is resistance strain type sensor, and its technological core is a sensitive element---strain ga(u)ge.Its principle of work is that resistance strain gage is sticked on the metallic elastic component, and when the flexible member gravitate produced distortion, then resistance strain gage changed because of deformation produces respective resistance values, produces voltage output, thereby records by the value of dynamometry.Resistance-strain is in respect of two kinds: metal strain chip and semiconductor strain formula, wherein: metal strain formula sensor application history is the longest.The characteristics of resistance strain type sensor are that dynamic perfromance is good, version is simpler, easy to use, therefore, obtained at present to use very widely in the weighing technology field.But the input of resistance strain type sensor, output function relation is non-linear, and uses tackifier to paste foil gauge, thus there be creep and the hysteresis that causes by tackifier, and technological deficiencies such as zero point, sensitivity drift.In addition, resistance strain type sensor has non-linearly increased cost to making the line design complexity for revising it, and has reduced its reliability and response speed.
Summary of the invention
At present, the resistance strain type sensor that the weighing technology field just in widespread usage, because its input, output relation are non-linear, and have technological deficiencies such as creep, hysteresis and zero point, sensitivity drift and long-time stability difference, weighing accuracy is difficult to improve and is difficult to obtain reliable and stable weighing result.Especially when being applied to dynamic weighing, weighing accuracy is difficult to reach 0.5 grade, and its actual systematic error often surpasses 3～5%, can't satisfy modern trade and the commercial production high request to weighing accuracy.In addition, resistance strain type sensor in actual applications, in order to carry out linearization process and the drift that suppresses its zero point, sensitivity, it is complicated that line design often is tending towards, so not only failing fundamentally, (on the principle) overcomes its technological deficiency, increase the error component of its system all the better, and increased manufacturing cost.
Purpose of the present invention is exactly in order to overcome the above-mentioned technological deficiency of resistance strain type sensor, and a kind of buoyant force weighing sensing device of innovating from the weighing principle that provides.Inventive principles of the present invention is called buoyancy weighing principle, and its technological core is to utilize the buoyancy of liquid principle---and the volume of the liquid that buoyancy and this object that liquid reacts on immersion object are wherein arranged is directly proportional, and is the relation of pure linearity.
The buoyant force weighing sensing device is to utilize the buoyancy of liquid principle to convert gravity value to displacement tangible shift value, and converts this shift value to export with linear relationship voltage signal, is used to detect or control a kind of sensor of gravimetric value.It not only overcome resistance strain type sensor non-linear, zero waft, technological deficiency such as creep, thereby greatly improved weighing accuracy, and reliability, stability are strong, simple in structure, cheap for manufacturing cost.
The technical scheme that technical solution problem of the present invention is adopted is:
The buoyant force weighing sensing device is by the buoyant equilibrium device that gravity value is converted to shift value, the weighing liquid leakage preventing mechanism of leaked liquid prevents to weigh, device is sent in the displacement signal change that shift value is converted to electric signal, bears, conducts the displacement activity assembly of gravity value and the magnetic centering hanger means of assurance displacement activity assembly fixing vertical axis direction displacement in no Frotteurism lower edge and form.
Concrete technical scheme is as follows:
The buoyant equilibrium device is made up of: cylinder body, weigh liquid and the float of weighing.Fill the quantitative liquid of weighing in the cylinder body, be in the displacement activity assembly float of weighing bottom and invade in the liquid of weighing by the deadweight of whole displacement activity assembly.When the buoyancy value that reacts on the float of weighing when the deadweight gravity value of displacement activity assembly and the liquid of weighing equated, the float of weighing was in equilibrium state.Weigh float when not bearing external force, and the position during this equilibrium state is called zero displacement point.After the displacement movable component had born gravity value, former balance state was broken, weigh float will from displacement zero point along its axis direction sinking displacement.When the buoyancy value of the liquid generation of weighing that is arranged owing to the float sinking displacement of weighing equates with its gravity value of being born, the float of then weighing will be in equilibrium state again on the position behind the sinking displacement.Also promptly, because the float of weighing has born the gravity value of surveying, will produce corresponding displacement, thereby realize gravity value is converted to the purpose of shift value.Because the liquid of weighing that is contained in the cylinder body is quantitative; Because cylinder body and the internal diameter of the liquid contact site of weighing and the external diameter of the weigh float and the liquid contact site of weighing, they separately the vertical cross-section area of cylinder equate, and the ratio relation between two areas is fixed, so the funtcional relationship between the gravity value that shift value and its bore of the float of weighing is linear.
In order to prevent to have influenced the setting of the buoyant force weighing sensing device limit of power of weighing because of the liquid of weighing leaks, the anti-plug made from permeability magnetic material of letting out that is fixedly connected with it is housed in the upper surface of the float of weighing, in the electromagnet casing that is fixed in the cylinder body upper end, be assembled with band and prevent letting out the closed type electromagnet in hole, thereby formed weighing liquid leakage preventing mechanism.When the anti-Kong Yufang that lets out lets out plug to be in mated condition following time be close-fitting, the liquid that can prevent to weigh leaks.Stop the work of weighing at the buoyant force weighing sensing device and be in non-power status following time, the closed type electromagnet works, to prevent letting out the plug adhesive by its magnetic force and let out in the hole, when the buoyant force weighing sensing device quits work, have the possible purpose that leaks thereby reached the liquid that prevents to weigh to anti-.
Displacement signal becomes and to send device by the capping that the center is porose, and coil case is assembled in the primary coil in the coil case, be assembled in being outside the primary coil oppositely to be concatenated into upper and lower two groups of secondary coils of differential type.Be assembled in can form in the primary coil endoporus along the magnetic core of the upper and lower free displacement of axis.The cylinder body of capping, coil case, electromagnet casing and buoyant equilibrium device is formed the monolithic case of buoyant force weighing sensing device together.The bottom of magnetic core combines as a whole with the float of weighing by the bar portion of the float upper end of weighing, when the float of weighing produces the displacement of axis direction, will drive magnetic core in the primary coil endoporus along the axis direction displacement.Primary coil is by the alternating current excitation, and its alternating current initial voltage is (U
0).Magnetic core is being weighed float when not bearing that gravity value is the same with the float of weighing also to be in zero displacement point, will be in the axis centre position of primary coil.In such cases, because upper and lower twice level coil magnetic equate that the voltage of mutual inductance effect equates that phase place is opposite, output voltage is zero.After the float of weighing is bearing gravity value, will drive magnetic core along axis direction to bottom offset, like this, following secondary coil increases with the coefficient of mutual inductance of primary coil coupling because air-gap reduces and magnetic resistance reduces, and then descend the induced voltage increase of secondary coil; In like manner, the induced voltage of last secondary coil reduces.The voltage difference (Δ e) of output this moment will be greater than zero.The size of output voltage difference will change by positive ratio along with the size of magnetic core shift value, but has realized shift value is converted to the purpose of the electric signal of observing and controlling.
For the bar portion of the float upper end that guarantees to weigh in greater than the closed type electromagnet endoporus of its diameter along the free displacement of vertical axis direction, and do not rub with its hole wall; For the magnetic core that guarantees to connect with the bar portion of the float upper end of weighing in the endoporus of primary coil along the free displacement of vertical axis direction, and do not rub with its hole wall.The parts that bear gravity value of buoyant force weighing sensing device of the present invention, must guarantee that the displacement activity assembly can be along the free displacement of vertical axis direction: these parts are called the magnetic centering hanger means.The magnetic centering hanger means by: in order to connect the connector of weighing device, be assembled in the permanent magnet in the connector, but place the interior free rolling spheroid of concave surface of permanent magnet lower surface, joint is hung in the magnetic work by the permeability magnetic material making of the concave surface containing spheroid of its upper surface of usefulness below spheroid and the displacement suspension rod is formed.Because the permanent magnet and the magnetic work that are assembled in the connector are hung between the joint by the mutual adhesive of magneticaction, being assembled in its middle spheroid can freely roll, the resultant direction of its magnetic line of force overlaps fully with the displacement axis direction of displacement activity assembly, therefore, magnetic core that is connected by the displacement suspension rod and the float of weighing that connects with magnetic core lean on its deadweight will be in the vertical state that is hung, will be during displacement along the displacement of vertical axis direction, thus the no Frotteurism when having guaranteed its displacement.Because the aperture of the capping of buoyant force weighing sensing device is greater than the diameter of displacement suspension rod, so the displacement suspension rod can not rub along the vertical axis displacement of the lines time and between the capping yet.Be carved with balance point midway groove on the displacement suspension rod, also be carved with minimal buoyancy position groove and maximum buoyancy position groove in the position of this line upper and lower respectively.It is movable the connection that the displacement suspension rod becomes between the magnetic core that send device with displacement signal, can adjust the upper and lower position of displacement suspension rod when being in stable state along axis direction in order to realization, thereby adjusts the zero setting position of the balance point midway groove on the displacement suspension rod.
Magnetic centering hanger means, displacement signal become send the magnetic core of device, the float of weighing of buoyant equilibrium device to be connected as a single entity, and wholely carries out displacement along the vertical axis direction, is collectively referred to as the displacement activity assembly.It is the assembly that bears, conducts gravity value, also is the assembly that bears the buoyancy value, and gravity is opposite with buoyancy two direction vectors, and is in together on the vertical axis direction of displacement activity assembly.
The principle of work of buoyant force weighing sensing device is as follows:
When the buoyant force weighing sensing device is weighed work, the float of weighing immerses in the liquid of weighing by the deadweight of displacement activity assembly, when because weighing of weighing that float the arranges buoyancy value that liquid produced when equating with the gravity value of displacement activity assembly sole mass, because they are two the opposite vectors of direction that are on the same vertical axis, so the float of weighing will be in equilibrium state.The equilibrium position of the float of weighing when weighing work is a zero displacement point, and when weighing work, the gravity value of surveying puts on the magnetic centering hanger means by weighing device, and through the conduction of displacement activity assembly, the float of weighing is sunk by zero displacement point.When because the float of weighing sinks the buoyancy value of the new generation of the liquid of weighing institute arrange when equating with the survey gravity value by zero displacement point, the float of weighing will be in equilibrium state again.Also promptly, because the effect of the gravity value of surveying, the float of weighing has produced a certain amount of shift value with the big or small linear funtcional relationship of gravity value, and this shift value is become by displacement signal and send device to be converted to and can to export for the electric signal that detects, controls by positive ratio relation.
When the buoyant force weighing sensing device was applied to the weighing technology field, its electric signal of exporting sent analog to digital converter to, was digital signal by AD converter with this analog signal conversion, sent the EOC signal to computing machine when its EOC.Result after computing machine is changed it carries out processing such as filtering, quantification.Result after the processing is sent to display and shows, simultaneously this result is preserved, and for data statistics later on provides definite data, thereby has realized carrying out the purpose of weighing work.
As can be known, electric signal that the buoyant force weighing sensing device is exported and the funtcional relationship of being surveyed between the gravity value are linear from the description of above concrete technical scheme.
When carrying out actual weighing work; Often the suitable environment temperature there is certain area requirement.When variation of ambient temperature, because of the existence of thermal expansivity, the liquid level position of the liquid of weighing in the cylinder body of buoyant force weighing sensing device will change because of expanding with heat and contract with cold, and therefore must cause that also the axial location of float under equilibrium state of weighing changes thereupon.Cumulative volume amount when the thermal expansivity and the liquid of weighing in the cylinder body of the selected liquid of weighing, in the temperature range that requires, when the atomic little displacement variable that the float of weighing that causes because of expanding with heat and contract with cold produces along axis is not enough to influence the weighing accuracy requirement of its defined, promptly can be considered the buoyant force weighing sensing device and do not exist temperature to waft.
By the weighing principle of buoyant force weighing sensing device and structural principle as can be known, it is different from the resistance strain type sensor of present widespread usage, does not have the technical factor that produces creep, does not therefore have creep.
Because buoyant force weighing sensing device displacement when gravity value is converted to shift value is big, the ratio of displacement error and displacement is very little, so the good reliability of error control; Have fabulous receptivity because of liquid again, so its job stability is strong.
By above-mentioned description to buoyant force weighing sensing device structural principle also as can be known; It is simple in structure, and is cheap for manufacturing cost.
In order to become multiple to enlarge the limit of power of weighing of buoyant force weighing sensing device, or in order to reduce the physical dimension of buoyant force weighing sensing device as far as possible, the buoyant force weighing sensing device is on the apparatus that is applied to weigh the time, often be not to allow it directly bear weight (M) value of the material of surveying, but the gravity (G) that the buoyant force weighing sensing device is born by the lever ratio that becomes the multiple relation is worth into dwindling of multiple.
The LOAD CELLS of various principles is when being applied to the Dynamic Weighing Technology field, and the control method of its PID system will be different because of the principle of its sensing technology.The resistance strain type sensor that present widespread usage, the embodiment that uses in the Dynamic Weighing Technology field has: belt conveyer scale, weightless scale, bunker scale, helix balance etc.The observing and controlling principle of its PID system all is: what it was imported, exports is full dose (or equivalent) value of the material of its weighing.Like this, the various mechanical factors of weighing system, the error that the creep of external interference factor, especially sensor self, the zero factor of wafing etc. is caused all is reflected in the weighing result.Therefore, caused that systematic error is big, error correction systems is complicated, and the defective of wayward error amount, to making its system's weighing accuracy be difficult to improve.What widespread usage at present is all kinds of dynamic weighing systems of senser element with the resistance strain type sensor, the accuracy index of resistance strain weighing transducer self meets the relevant criterion requirement often, and systematic error (final weighing result) is because of the restriction of its PID system monitoring principle, far do not meet the requirement of weighing accuracy, generally greater than 3～5%.
Buoyant force weighing sensing device and the PID Deviation Control Method when being applied to dynamic weighing thereof promptly are to invent at the above-mentioned defective of resistance strain type sensor and its dynamic weighing system.Its observing and controlling principle is: the weight of material value with institute's weighing is zero by the leverage balance earlier, and what its PID system was controlled only is the deviate that departs from detection, control initial point.This control method is that principle of work and the architectural characteristic thereof by the buoyant force weighing sensing device determined, is that resistance strain type sensor institute is irrealizable.
PID Deviation Control Method when the buoyant force weighing sensing device is applied to dynamic weighing, the technical scheme that is adopted is as follows:
When the buoyant force weighing sensing device was applied to dynamic weighing, its system was called buoyancy gamut dynamic weighing system, was made up of machinery and automatic control two large divisions.Its mechanical part is made up of the magnetic centering hanger means of the fulcrum of the belt feeder of weighing (or other apparatuses of weighing), balanced weight and counterweight, buoyant force weighing sensing device, leverage, leverage, buoyant force weighing sensing device and batcher etc.One side of leverage fulcrum is balanced weight and counterweight, and opposite side is weigh belt feeder and buoyant force weighing sensing device, and wherein, the arm of force of buoyant force weighing sensing device becomes the arm of force greater than the belt feeder of weighing of integral multiple.The arm of force of the arm of force of the arm of force of balanced weight and counterweight, the belt feeder of weighing, buoyant force weighing sensing device becomes fixing ratio relation between the three.The gravitational vector direction of the gravitational vector direction of balanced weight and counterweight and the belt feeder of weighing all is that vertical is downward, and the buoyancy direction vector of buoyant force weighing sensing device is that vertical makes progress.
Under the empty scale state before not carrying out weighing work, by adjusting the quality that balance is wasted time, making leverage is to be in equilibrium state under zero the prerequisite at the output electric signal of buoyant force weighing sensing device.At this moment, the displacement signal change send the magnetic core in the device to be in the zero displacement point position, then, adjusts the displacement suspension rod and makes its balance point midway groove aim at pointer.Because when magnetic core is near the zero displacement point, its electric signal of exporting is weak, poor anti jamming capability.In order to improve the antijamming capability of electric signal, after pointer is to quasi-equilibrium point midway groove, under the prerequisite that keeps the leverage equilibrium state, continue the quality of fine setting balanced weight again, make magnetic core depart from zero displacement point, until pointer to quasi-equilibrium point midway groove and maximum buoyancy position groove or and minimal buoyancy position groove between a certain desired location.Displacement signal becomes the value of electrical signals of sending device to be exported when this desired location, be detection, control initial point when carrying out dynamic weighing.
Before buoyancy gamut dynamic weighing system carries out weighing work,, calculate setting weight (M) value of the delay inventory on the belt of weighing earlier according to the ability of weighing of desired unit interval of technology.When buoyancy gamut dynamic weighing system carries out weighing work, the M value will be added on the belt of weighing, constant for the original equilibrium state of leverage that keeps weighing, on balanced weight, increase a certain amount of counterweight that calculates by ratio again, cross into M value in the journey with the balance dynamic weighing.At this moment, the electric signal exported of buoyant force weighing sensing device is still the value of electrical signals of detection, control initial point.
The weighing accuracy of dynamic weighing system is decided by the control to M value and belt speed.Buoyancy gamut dynamic weighing system is when weighing work, after the actual weight value of the delay inventory on the belt of weighing departs from the M value of calculating setting in advance, gravity (G) value that the buoyant force weighing sensing device is born and play buoyancy (F) value of equilibrium activity with it will change according to the variation of actual weight value thereupon.The near value of electrical signals that the buoyant force weighing sensing device is exported of the variation of buoyancy value changes.At this moment, form closed loop by the PID deviation control, the linear velocity of belt thereby the feeding coal of change batcher or change are weighed, make the gravimetric value of the delay inventory on the belt of weighing that is under the dynamic weighing state, always tend to and reach calculate target value set (M) in advance, thus, realized guaranteeing the purpose of weighing accuracy by the control of deviate that the M value is departed from detection, control initial point.
For guaranteeing buoyant force weighing sensing device no Frotteurism in the course of the work, be this value relation between the displacement that guarantees electric signal that it is exported and displacement activity assembly, must guarantee that when mounted the axis of displacement activity assembly is in the plumb position, be on the same vertical axis to guarantee gravitational vector and buoyancy vector.
PID Deviation Control Method when the buoyant force weighing sensing device is used for dynamic weighing, its M value by the weighing material of controlling depart from the deviate of detection, control initial point.Analyze from funtcional relationship, time horizon coordinate and with respect to the weight vertical coordinate of representing with value of electrical signals, in the whole dynamic weighing process, the value of electrical signals at detection, control initial point that the buoyant force weighing sensing device is exported is the horizontal function straight line of an endless.What PID deviation control system was controlled is the deviate that departs from this horizontal function straight line, makes it always to trend towards this horizontal function straight line.Therefore:, controlled when the small error of M value generation first because buoyant force weighing sensing device highly sensitive; Second because the deviate that is produced in the dynamic weighing process is to be the undulating quantity of two-way (positive and negative) variation of center line with horizontal function straight line.Along with the continuity of time, the positive and negative deviation value will constantly be cancelled out each other, and when stopping to weigh work, only remainder stops the preceding last error amount of the work of weighing, and the general name value is ever-increasing accumulating value along with the continuity of time.So the various dynamic weighing systems that the weighing accuracy of buoyancy gamut dynamic weighing system far above present common application can reach 0.5 grade, also, its error can be controlled in 0.25%.
Description of drawings
Be further described as follows below in conjunction with drawings and Examples again to the present invention:
The structural principle synoptic diagram of Fig. 1, core of the present invention---buoyant force weighing sensing device
Fig. 2, displacement signal become the circuit theory diagrams that send device
Fig. 3, the specific embodiment when the buoyant force weighing sensing device is applied to dynamic weighing---buoyancy gamut dynamic weighing system principle schematic
In Fig. 1, among Fig. 2: 1-cylinder body, the 2-liquid of weighing, the 3-float of weighing, 4-closed type electromagnet, 5-electromagnet casing, 6-primary coil, 7-magnetic core, 8-upward secondary coils, 9-coil case, 10-capping, 11-displacement suspension rod, 12-connector, 13-permanent magnet, 14-spheroid, joint is hung in the work of 15-magnetic, 16-maximum buoyancy position groove, 17-pointer, 18-balance point midway groove, 19-minimal buoyancy position groove, 20-following secondary coil, the 21-anti-hole of letting out, the 22-anti-plug of letting out.U
0-alternating current initial voltage, Δ e-voltage difference.
In Fig. 3: 23-(on the belt of weighing) the delay material, 24-the belt feeder of weighing, 25-fulcrum, 26-counterweight, 27-balanced weight, 28-batcher, 29-leverage, the magnetic centering hanger means of 30-buoyant force weighing sensing device, 31-buoyant force weighing sensing device, the setting weight value of M-delay inventory, G-gravity value, F-buoyancy value, the DC-data acquisition system (DAS) of weighing, IPC-microsystem, VC-batcher automatic control system, MC-motor frequency conversion control device, CRT-display, PRT-printer.
Embodiment
Fig. 1 is the specific embodiment of buoyant force weighing sensing device, among the figure:
The monolithic case of buoyant force weighing sensing device is formed in cylinder body (1), electromagnet casing (5), coil case (9), capping (10), is fixed with pointer (17) in the upper surface of capping (10).
The magnetic work made from permeability magnetic material of lonely face was hung joint (15), is placed permanent magnet (13) and magnetic work to hang the spheroid (14) of the corresponding lonely face centre of joint (15) two, be fixed in the displacement suspension rod (11) that joint (15) lower end is hung in magnetic work, composition magnetic centering hanger means in permanent magnet (13), its upper surface of lonely face had in web member (12), the central axis position of being fixed in its lower surface of web member (12) lower end had.Connector (12) connects with the device of weighing of conduction gravity.
In coil case (9), be assembled with the last secondary coil (8) and the following secondary coil (20) of stationkeeping, in twice level coils, be assembled with the primary coil (6) of the stationkeeping that is same axis with it, being equipped with in the endoporus of primary coil (6) can be along the magnetic core (7) of the free upper and lower displacement of axis, capping (10) is packaged in the upper port of coil case (9), send device thereby form the displacement signal change.By Fig. 2 (displacement signal becomes the circuit theory diagrams that send device) as can be known: displacement signal becomes the primary coil (6) that send device and is encouraged by alternating current, and initial voltage is (U
0); Twice level coils are and oppositely are concatenated into differential type, when magnetic core (7) when axis produces displacement, the pressure difference of will transmitting electricity (Δ e).
By cylinder body (1), be contained in the quantitative liquid of weighing (2) in the cylinder body (1), along weigh the float of weighing (3) in the liquid (2) of the immersion of buoyant force weighing sensing device axis displacement, form the buoyant equilibrium device.
The magnetic centering hanger means, with the displacement suspension rod (11) of magnetic centering hanger means with the magnetic core (7) of thread connection, the bar portion of its upper end and the float of weighing (3) that magnetic core (7) is fixedly connected, composition can be along the displacement activity assembly of axis integral body displacement.
When the buoyant force weighing sensing device was weighed work, its axis was in the vertical state.The magnetic centering hanger means can guarantee the axis free displacement of displacement activity assembly along the buoyant force weighing sensing device.Because the aperture of capping (10) is greater than the external diameter of displacement suspension rod (11), the internal orifice dimension of primary coil (6) is greater than the external diameter of magnetic core (7), the internal orifice dimension of closed type electromagnet (4) is greater than the external diameter of the bar portion of the float of weighing (3) upper end, so the displacement activity assembly is in no Frotteurism along the axis displacement of buoyant force weighing sensing device the time.
When weighing work, the float of weighing (3) is invaded in the liquid (2) of weighing because of the gravity that sole mass produced of displacement activity assembly.When the buoyancy value (F) that the liquid of weighing (2) that arranges when the float of weighing (3) is produced equates with the gravity value of displacement activity assembly, because of they are two opposite vectors of direction that are on the same axis, the displacement activity group will be in the balance stationary state, at this moment, the weigh position of float (3) and magnetic core (7) will be its zero displacement point separately respectively.The volume of the liquid of weighing (2) in the buoyant equilibrium device cylinder body (1) is with the weigh position of zero displacement point on axis of float (3) and magnetic core (7) of decision.When magnetic core (7) is in the centre position of primary coil (6), also be the volume of the weigh liquid (2) of its voltage difference (Δ e) when being zero, be the quantitative values that should inject cylinder body (1).
There is certain clearance between the bar portion of the float because weigh (3) upper end and the endoporus of closed type electromagnet (4), liquid leaks in order to prevent to weigh, by: electromagnetism shell (5), the male-tapered made from permeability magnetic material that is assembled in that interior tapered anti-on closed type electromagnet (4) in the electromagnet casing (5), closed type electromagnet (4) lower surface lets out hole (21), the bar portion of the float of weighing (3) upper surface and its upper end of being fixed in combines as a whole is anti-lets out plug (22), formed the liquid of weighing and prevented letting out structure.When the buoyant force weighing sensing device stops to weigh work, to be under the non-power status, the closed type electromagnet is let out plug (22) adhesive to its anti-letting out in the hole (21) anti-, the anti-hole (21) of letting out is let out plug (22) and closely cooperated with anti-, and is possible thereby the liquid (2) that prevented to weigh leaks when the buoyant force weighing sensing device quits work.
Fig. 3 is specific embodiment---the principle schematic of buoyancy gamut dynamic weighing system of buoyant force weighing sensing device when being applied to dynamic weighing.
Buoyancy gamut dynamic weighing system is made up of machinery, automatic control two large divisions.In its principle schematic:
Mechanical part is made up of the magnetic centering hanger means (30) of: the fulcrum (25) of the belt feeder of weighing (24), batcher (28), leverage (29), leverage, balanced weight (27), counterweight (26), buoyant force weighing sensing device (31) and the buoyant force weighing sensing device that connects with the leverage end.
One side of leverage fulcrum (25) is balanced weight (27) and counterweight (26), and opposite side is weigh belt feeder (24) and buoyant force weighing sensing device (31).In the leverage: the arm of force of buoyant force weighing sensing device (31) becomes the arm of force greater than the belt feeder of weighing (24) of multiple; The arm of force of the arm of force of the arm of force of balanced weight (27) and counterweight (26), the belt feeder of weighing (24), buoyant force weighing sensing device (31) becomes fixing ratio relation between the three; The gravitational vector direction of the gravitational vector direction of balanced weight (27) and counterweight (26), the belt feeder of weighing (24) all is that vertical is downward, and the buoyancy direction vector of buoyant force weighing sensing device (31) is that vertical makes progress.
The gravity rule of the belt feeder (24) of weighing deadweight in the equilibrium state process of adjusting leverage (29), has been balanced the gravitational torque of stone roller (27) and buoyancy (F) the square institute balance of buoyant force weighing sensing device (31).Be detained the weight torque balance of gravity (M) square of material (23) by counterweight (26), when the M value changes, buoyancy (F) value will change thereupon, thereby guarantee that leverage (24) keeps equilibrium state in whole weighing process.
Automatic control part by: the data acquisition system (DAS) of weighing (DC) microsystem (IPC), batcher automatic control system (VC), motor frequency conversion control device (MC), display (CRT), printer (PRT) are formed.
Delay material (23) amount of weighing on the belt is precalculated setting weight (M) value, and in whole dynamic weighing process, M value is the variable of continuous variation.When the M value changes, buoyancy (F) value will change thereupon accordingly, and buoyant force weighing sensing device (31) is exported corresponding electric signal (Δ e).After the data acquisition system (DAS) of weighing (DC) is gathered electric signal, handle through microsystem (IPC), or change the feeding coal of feed by batcher automatic control system (VC), or change the belt speed of the belt of weighing by motor frequency conversion control device (MC), thereby make the M value always tend to the setting weight value, to guarantee weighing accuracy.
Claims (7)
- Buoyant force weighing sensing device and the PID Deviation Control Method when being used for dynamic weighing1, a kind of buoyancy of liquid principle of utilizing converts gravity value to shift value, and the buoyant force weighing sensing device that is used to detect or control the weight of material value of linear output, and its technical characterictic is:(1), by the liquid of weighing (2) in the cylinder body (1), cylinder body, immerses the buoyant equilibrium device that gravity value is converted to shift value that the float of weighing (3) in the liquid of weighing is formed along the cylinder body axis.(2), by the electromagnet casing (5) that is combined into one with cylinder body, be assembled in the electromagnet casing having the anti-closed type electromagnet (4) of letting out hole (21), the bar portion of weigh float upper surface and the float upper end of weighing of being fixed in combines as a whole anti-ly lets out the weighing liquid leakage preventing mechanism that plug (22) is formed with what permeability magnetic material was made(3), by with electromagnet casing, cylinder body is combined into the coil case (9) of buoyant force weighing sensing device monolithic case together, capping (10) that the center is porose and the initial voltage by the alternating current excitation that is assembled in the coil case are the primary coil (6) of (U0), being assembled in being outside the primary coil oppositely is concatenated into the last secondary coil (8) and the following secondary coil (20) of differential type, be assembled in can become in the primary coil endoporus and send device along the displacement signal that shift value is converted to electric signal (Δ e) that the magnetic core (7) of the free displacement of axis is formed(4), by connector (12), be assembled in permanent magnet (13) in the connector, place spheroid (14) in the concave surface of permanent magnet lower surface, joint (15) is hung in magnetic work that the concave surface of its upper surface of usefulness below spheroid contains spheroid is made by permeability magnetic material and hang with magnetic work respectively and save and magnetic centering hanger means that displacement suspension rod (11) that magnetic core connects is formed(5), by the magnetic centering hanger means, by displacement suspension rod and the joining magnetic core of magnetic centering hanger means, the bar portion of upper end and the displacement activity assembly that bears, conducts gravity value that the joining float of weighing of magnetic core is formed.PID Deviation Control Method when a kind of buoyant force weighing sensing device is used for dynamic weighing:When the buoyant force weighing sensing device is applied to dynamic weighing, its system is called buoyancy gamut dynamic weighing system, form by machinery and automatic control two large divisions, its mechanical part is by the belt feeder of weighing (or other machineries of weighing) (24), balanced weight (27) and counterweight (26), buoyant force weighing sensing device (31), leverage (29), fulcrum (25), the magnetic centering hanger means (30) of buoyant force weighing sensing device and batcher compositions such as (28), its automatic control part is by the data acquisition system (DAS) of weighing (D.C), microsystem (IPC), batcher automatic control system (V.C), motor frequency conversion control system (M.C) and display (CRT), printer compositions such as (PRT), before carrying out weighing work, will be according to the ability of weighing of desired unit interval of technology, calculate setting weight (M) value of delay material (23) amount on the belt of weighing in advance, the technical characterictic of its PID Deviation Control Method is: buoyancy gamut dynamic weighing system is when carrying out weighing work, after the actual weight value of the delay inventory on the belt of weighing departs from the M value of calculating setting in advance, gravity (G) value that the buoyant force weighing sensing device is born and play buoyancy (F) value of equilibrium activity with it, to change according to the variation of actual weight value thereupon, the near value of electrical signals that the buoyant force weighing sensing device is exported of the variation of buoyancy value changes, at this moment, form closed loop by the PID deviation control, the linear velocity of belt thereby the feeding coal of change batcher or change are weighed, make the gravimetric value of the delay inventory on the belt of weighing that is under the dynamic weighing state, always tend to and reach predefined desired value.
- 2, according to the buoyant force weighing sensing device described in the claim 1, its technical characterictic is: the liquid of weighing in the cylinder body of its buoyant equilibrium device is quantitative, its cylinder body equates with each vertical cross-section area of the internal diameter cylinder of the liquid contact site of weighing, its float of weighing equates with each vertical cross-section area of the external diameter cylinder of the liquid contact site of weighing, and above-mentioned cylinder diameter cross-sectional area and the ratio of weighing between the float external diameter cross-sectional area are fixed.
- 3, according to the buoyant force weighing sensing device described in the claim 1, its technical characterictic is: the anti-Kong Yufang of letting out of its weighing liquid leakage preventing mechanism lets out between the plug, under situation about being in contact with one another by adhesive is close-fitting, and does not exist and can cause the gap of leaking the liquid of weighing.
- 4, according to the buoyant force weighing sensing device described in the claim 1, its technical characterictic is: the resultant direction of the magnetic line of force of its magnetic centering hanger means overlaps fully with the displacement axis direction of displacement activity assembly, the displacement activity assembly is along the upper and lower displacement of axis the time, between the endoporus of displacement suspension rod and capping, between the endoporus of magnetic core and primary coil, the bar portion of float upper end and closed type electromagnet anti-of weighing lets out between the hole all contactless, is in no Frotteurism.
- 5, according to the buoyant force weighing sensing device described in the claim 1, its technical characterictic is: it is movable the connection that the displacement suspension rod of magnetic centering hanger means becomes between the magnetic core that send device with its displacement signal, can adjust the upper and lower position of displacement suspension rod when being in stable state along axis direction in order to realization, thereby adjust the zero setting position of the balance point midway groove (18) on the displacement suspension rod.
- 6, according to the buoyant force weighing sensing device described in the claim 1, its technical characterictic is: the direction vector of the gravitational vector that its displacement activity assembly bears, conducts overlaps fully with the displacement axis of displacement activity assembly, and is opposite with buoyancy direction vector on being in same axis.
- Control method when 7, being used for dynamic weighing according to the buoyant force weighing sensing device described in the claim 1, its technical characterictic is: under the empty scale state before not carrying out weighing work, by adjusting the quality of balanced weight (27), making leverage is to be in equilibrium state under zero the prerequisite at the output electric signal of buoyant force weighing sensing device.At this moment, the displacement signal change send the magnetic core in the device to be in the zero displacement point position, then, adjusting the displacement suspension rod makes its balance point midway groove aim at pointer (17), after pointer is to quasi-equilibrium point midway groove, under the prerequisite that keeps the leverage equilibrium state, continue the quality of fine setting balanced weight again, make magnetic core depart from zero displacement point, until pointer to quasi-equilibrium point midway groove and maximum buoyancy position groove (16) or and minimal buoyancy position groove (19) between a certain desired location, displacement signal becomes the value of electrical signals of sending device to be exported when this desired location, be the detection when carrying out dynamic weighing, the control initial point.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB200410024519XA CN1297803C (en) | 2004-07-23 | 2004-07-23 | Float weighing sensor and PID deviation control method for dynamic coeighing |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB200410024519XA CN1297803C (en) | 2004-07-23 | 2004-07-23 | Float weighing sensor and PID deviation control method for dynamic coeighing |
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| CN1598498A true CN1598498A (en) | 2005-03-23 |
| CN1297803C CN1297803C (en) | 2007-01-31 |
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| CNB200410024519XA Expired - Fee Related CN1297803C (en) | 2004-07-23 | 2004-07-23 | Float weighing sensor and PID deviation control method for dynamic coeighing |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102879064A (en) * | 2012-10-30 | 2013-01-16 | 孔令宇 | Variable speed feeding quantitative weighing system based on buoyant weighing and sensing principle |
| CN104390681A (en) * | 2014-10-24 | 2015-03-04 | 安徽恒源煤电股份有限公司 | Continuous weighing system used for coal mine belt conveyor |
| CN104820109A (en) * | 2015-05-19 | 2015-08-05 | 南京信息工程大学 | Wind speed meter |
| CN107884115A (en) * | 2016-09-30 | 2018-04-06 | 中国石油天然气股份有限公司 | The measuring method and device of aerostatic buoyancy change |
| CN108225656A (en) * | 2018-01-25 | 2018-06-29 | 杨曙铭 | A kind of buoyancy size measurement |
| CN110440881A (en) * | 2019-07-17 | 2019-11-12 | 徐明远 | A kind of single-point weighing system, weighing device and weighing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH648122A5 (en) * | 1980-07-09 | 1985-02-28 | Vyzk Ustav Keramiky | Sedimentation balance |
| DE3543607A1 (en) * | 1985-12-10 | 1987-06-11 | Karl Ing Grad Speidel | High-accuracy weighing machine as a beam scale with arms of equal length |
| CN2121681U (en) * | 1992-05-06 | 1992-11-11 | 刘德润 | Electromagnetic induction hydraulic level sensor and automatic balance float |
| CN2138289Y (en) * | 1992-08-10 | 1993-07-14 | 张传新 | Magnetic floating water level needle |
| CN2189737Y (en) * | 1993-06-23 | 1995-02-15 | 陕西省计量测试研究所 | Floating-tube metering device for the liquid in vertical tank |
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2004
- 2004-07-23 CN CNB200410024519XA patent/CN1297803C/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102879064A (en) * | 2012-10-30 | 2013-01-16 | 孔令宇 | Variable speed feeding quantitative weighing system based on buoyant weighing and sensing principle |
| CN102879064B (en) * | 2012-10-30 | 2015-03-04 | 孔令宇 | Variable speed feeding quantitative weighing system based on buoyant weighing and sensing principle |
| CN104390681A (en) * | 2014-10-24 | 2015-03-04 | 安徽恒源煤电股份有限公司 | Continuous weighing system used for coal mine belt conveyor |
| CN104390681B (en) * | 2014-10-24 | 2016-09-21 | 安徽恒源煤电股份有限公司 | A kind of continuous weighting system for coal mine leather belt conveyer |
| CN104820109A (en) * | 2015-05-19 | 2015-08-05 | 南京信息工程大学 | Wind speed meter |
| CN107884115A (en) * | 2016-09-30 | 2018-04-06 | 中国石油天然气股份有限公司 | The measuring method and device of aerostatic buoyancy change |
| CN107884115B (en) * | 2016-09-30 | 2019-11-12 | 中国石油天然气股份有限公司 | The measurement method and device of aerostatic buoyancy variation |
| CN108225656A (en) * | 2018-01-25 | 2018-06-29 | 杨曙铭 | A kind of buoyancy size measurement |
| CN110440881A (en) * | 2019-07-17 | 2019-11-12 | 徐明远 | A kind of single-point weighing system, weighing device and weighing method |
| CN113818067A (en) * | 2021-09-17 | 2021-12-21 | 温州市万荣电镀有限公司 | Novel electroplating equipment |
| CN113818067B (en) * | 2021-09-17 | 2022-12-13 | 温州市万荣电镀有限公司 | Electroplating equipment |
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| CN1297803C (en) | 2007-01-31 |
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