CN102818663B - Indirect pressure measuring device of electronic pressure machine - Google Patents
Indirect pressure measuring device of electronic pressure machine Download PDFInfo
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- CN102818663B CN102818663B CN201210317177.5A CN201210317177A CN102818663B CN 102818663 B CN102818663 B CN 102818663B CN 201210317177 A CN201210317177 A CN 201210317177A CN 102818663 B CN102818663 B CN 102818663B
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- cylinder body
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Abstract
The invention discloses an indirect pressure measuring device of an electronic pressure machine, which is characterized in that a pair of symmetrically distributed sunk planes is arranged on an outer wall of a cylinder body; projections of the sunk planes on the axis of the cylinder body are within a working stroke of a working piston rod in the cylinder body; a pressure measurement component comprises a substrate, a strain gauge, a pressure strain sensor guard plate and a lead for outputting result which are laminated on the sunk planes of the cylinder body sequentially; when a front end of the working piston rod encounters resistance, a generated reacting force is conducted to the cylinder body and material mechanical stress mechanical deformations are generated on the sunk planes; a base material of a pressure sensor in the guard plate of the pressure measurement component generates a stress deformation synchronously; and simultaneously, the strain gauge generates deformation to change resistance, so that a voltage added to a resistor changes, the resistance is transmitted to a strain electric bridge through the lead and then is transmitted to a computer processing system through an amplifier, thus realizing automatic control of indirect pressure measurement.
Description
Technical field
this technology relates to the device for pressure measurement of a kind of electronic press machine in pressing equipment field, relates in particular to the pressure indirect measurement system of a kind of electronic press machine using on pressing equipment.
Background technology
electronic press machine claims again servo-pressing machine, electron pressure cylinder, electron pressure driver etc., by parts such as servo motor, cylinder body, accurate planetary roller screw or precision ball screws, formed, close structure is compact, and running high-speed smooth is to implement the accurate pressure driver that press-fits operation.This electronic press machine technology maturation, both can work alone by unit, and can mate and realize robotization with computer system again, software facilitates setup parameter, modular design is implemented to control, and possess the functions such as operation, monitoring, record, storage, self diagnosis, and man-machine interface is clear, and good in interactive function is good, under pressure program pattern environment, press-fit pattern, stamping press and displacement are adjustable, and speed is stepless adjustable, convenient, constant, precisely reliable.Electronic press machine is obtaining a large amount of application in extensive manufacturing, as industries such as automobile, electric, electronics, household electrical appliances; In other leading-edge fields, also playing the part of key player, as fields such as space flight, aviation, military project, equipment manufacture, precision optical machinery and instrument.
prior art is the effective control in the course of work to electronic press machine, it is the adjustable control to dynamic stamping press, displacement, speed, wherein the control of stamping press is that pressure directly acts on pressure transducer, pressure produces small deformation to pressure transducer diaphragm, according to deflection, be converted to the electric signal of gaging pressure, after sending out greatly, be delivered to computer system and precisely control in program.The electronic press machine of prior art is at the built-in pressure transducer of cylinder body, directly to measure electronic press machine output services piston applied force.Conventionally adopt the pressure mode of directly measuring piston rod, be arranged on the inside or working piston bar of cylinder body.Is arranged on this frame mode on electronic press machine inside and working piston bar, has dominated the existing pressure measurement technology of electronic press machine, be widely applied, but this direct metering system still exists defect and deficiency:
1,
this installation method in cylinder body brings a series of difficulty to production and construction, need to carry out type selecting to pressure transducer, calculate, need to mate design and installation mechanical fastener mechanism, connector mechanism need to guarantee accurate centering, avoids the impact of crooked moment of torsion on measuring accuracy;
2,
although be arranged on sensor on working piston, to belong to cylinder body external, and itself and the connector mechanism that mates of pressure transducer, need equally accurate centering to avoid the impact of crooked moment of torsion on measuring accuracy, and outside mobile cable is highly susceptible to damage;
3,
be arranged on the cylinder interior pressure transducer of electronics press, very inconvenient when installing, safeguard, changing, whenever pressure transducer breaks down, need to decompose and take electronics press apart, planetary lead-screw, working piston is separated with cylinder body, just can carry out the judgement of pressure transducer and replacing;
4,
be arranged on the external pressure sensor on piston rod, the feature of this frame mode is that pressure transducer must move back and forth together along with piston rod, therefore, the line of pressure transducer is to-and-fro movement thereupon also, of long duration, will cause fatigue between stube cable and sensor to go wrong, cause electrical signal transfer unstable, unreliable;
5,
the electronic press machine metering system of prior art is the formula of directly measuring, be that the working pressure that electronics press produces acts directly on gaging pressure sensor, regular, repeatability, force squeezed state frequently, add the difference of the anti-overload ability of pressure transducer, performance reduction, the serviceable life of pressure transducer are shortened, the precision that impact is measured;
6,
therefore and the cost of the maintenance producing increases accordingly to electron pressure cylinder periodic replacement pressure transducer, be necessary, conventional maintenance safeguard.
Summary of the invention
in order to overcome defect and the deficiency of the direct metering system of existing conventional art electronic press machine, the object of this technology be to provide a kind of structure very simple, detect very directly perceived, handling are very convenient, safeguard very economic indirect type device for pressure measurement.
the relation being directly proportional to pressure according to the mechanics of materials stress deformation of electronics press cylinder body, this technology changes indirect metering system into the direct pressure metering system of electronic press machine, and the key condition changing is the transformation to cylinder body external structure, in the lower end of cylinder body outside, with cylinder in the live corresponding scope position of impulse stroke of working piston, a pair of correspondence is set, the symmetrical depression plane that is parallel to cylinder body axial line, symmetry is installed two pressure transducers for detection of block distortion amount respectively, and be converted to electric signal according to the stack of each pressure transducer different distortion amount, through amplifying, be delivered in control system, block distortion amount to this electronics press is demarcated, obtain force value accurately.The error of indirect side amount is like this substantially the same with the direct survey sensor of conditional electronic press, the object that this technology that Here it is realizes.
in order to realize above object, the invention provides a kind of pressure indirect measurement system of electronic press machine, for the physical quantity of Cylinder block stress deformation is demarcated, and be converted to electric signal by obtaining force value stack after demarcation, after amplifying, be delivered in control system, described electronic press machine comprises screw mandrel shaft block, adapter flange, feed screw nut, piston shell, cylinder body, pressure survey assembly, depression plane, forward flange, sliding sleeve, working piston bar, buffering ring, planetary roller screw, servomotor, gearing, drive coupling arrangement, described servomotor drives described gearing and drives the upper end of the planetary roller screw in described screw mandrel shaft block to make its rotation by described driving coupling arrangement, via described adapter flange, drive described feed screw nut again and make to-and-fro movement in its piston shell being integrally connected and the sliding sleeve of working piston bar on described forward flange, the front end of feed screw nut in described cylinder body and the distance definition between buffering ring are the impulse stroke of described working piston bar, wherein, on the outer wall of described cylinder body, be provided with a pair of symmetrical depression plane, described depression plane is in the projection in cylinder body axle center drops on the impulse stroke of working piston bar of described cylinder interior, described pressure survey assembly comprises the substrate being cascading in the depression plane of described cylinder body, foil gauge, pressure-strain sensor backplate and for the lead-in wire of Output rusults, when described working piston bar front end meets obstructions, the reacting force producing conducts to cylinder body and in described depression plane, produces mechanics of materials stress mechanical deformation, the matrix material of the pressure transducer in the backplate of described pressure survey assembly synchronously produces stress deformation, thereby described foil gauge produces deformation simultaneously and its resistance is changed make to be added in ohmically voltage to change, by described lead-in wire, resistance is transported to strain bridge and is transferred to through amplifier the automatic control that computer processing system is measured indirectly to realize pressure.
as further technical scheme, described depression plane parallels and surfacing with the axle center of cylinder body, and described pressure survey assembly fits tightly mutually with depression plane.
as further technical scheme, the model of the strain pressure transducer in a pair of symmetrical depression plane is identical respectively.
as further technical scheme, described cylinder body comprises square cylinder body and circular cylinder body, and described depression plane layout is parallel to the tangent line place of diameter on the side opposite the angle place of square cylinder body or the external diameter of circular cylinder body.
as further technical scheme, described cylinder body is fixed on equipment by forward flange.
because be indirect measurement, greatly improved the serviceable life of pressure transducer, because pressure transducer is directly installed on the outside on cylinder body, can not produce motion, there is not the servo-actuated problem of cable, it is extremely convenient to install simultaneously, detect, dismantle, safeguard, does not relate to and affects the inner any parts of electronic press machine; The indirect metering system of this cylinder body outside at electronic press machine, also cylinder interior structure, mechanism have been changed, traditional bindiny mechanism of pressure transducer is closely dispensed, the simplification that complexity dismounting assembling process is become, greatly reduce production cost and later maintenance cost, realized economy, environmental protection, energy-conservation, practical beneficial effect.
Accompanying drawing explanation
accompanying drawing 1 is the one-piece construction schematic diagram according to electronic press machine of the present invention;
accompanying drawing 2 is the left view of accompanying drawing 1;
accompanying drawing 3 is the front end partial schematic diagram of the pressing machine of accompanying drawing 1;
accompanying drawing 4 is the left view of accompanying drawing 3;
accompanying drawing 5 is the rotation partial cutaway schematic of accompanying drawing 3
accompanying drawing 6 is the left view of accompanying drawing 5;
accompanying drawing 7 is the vertical view of accompanying drawing 5;
accompanying drawing 8 is the local enlarged diagram of accompanying drawing 7;
accompanying drawing 9 is square cylinder body partial cutaway schematic;
accompanying drawing 10 is the left pseudosection of accompanying drawing 9;
accompanying drawing 11 is the vertical view of accompanying drawing 9;
the circular cylinder body partial cutaway schematic that accompanying drawing 12 is another kind of embodiment;
accompanying drawing 13 is the left pseudosection of accompanying drawing 12;
accompanying drawing 14 is according to the indirect measuring principle figure of the pressure of electron pressure of the present invention;
wherein: 1, screw mandrel shaft block; 2, adapter flange; 3, feed screw nut; 4, piston shell; 5, cylinder body; 6, pressure survey assembly; 61, backplate; 62, pressure-strain sensor; 63, lead-in wire; 64, substrate; 65, foil gauge; 7, depression plane; 8, forward flange; 9, sliding sleeve; 10, working piston bar; 11, buffering ring; 12, planetary roller screw; 13, servomotor; 14, gearing; 15, drive coupling arrangement.
Embodiment
below in conjunction with accompanying drawing, preferred embodiment of the present invention is described in detail, thereby so that advantages and features of the invention can be easier to be it will be appreciated by those skilled in the art that, protection scope of the present invention is made to more explicit defining.
referring to accompanying drawing 1 to shown in accompanying drawing 11, a kind of pressure indirect measurement system of electronic press machine, it is for demarcating the physical quantity of Cylinder block stress deformation, and measure force value according to each pressure transducer different distortion, stack is converted to electric signal mutually, after amplifying, be delivered in control system, electronic press machine comprises screw mandrel shaft block 1, adapter flange 2, feed screw nut 3, piston shell 4, cylinder body 5, pressure survey assembly 6, depression plane 7, forward flange 8, sliding sleeve 9, working piston bar 10, buffering ring 11, planetary roller screw 12, servomotor 13, gearing 14, drive coupling arrangement 15.
in order to realize pressure transducer, in the outside of cylinder body, install and arrange, must transform by cylinder body contour structures, at the corresponding site of material production torsion stress deformation, place strain gauge pressure sensor; According to the application principle of pressure transducer, foil gauge is to be adsorbed on strain resistor on matrix material to produce change in resistance phenomenon with mechanical deformation, it is resistance strain effect, realize the basis of this resistance strain effect, must have corresponding mounting plane to be combined with the matrix plane of pressure transducer and fix formation one.As shown in Figure 3, on the outer wall of cylinder body 5, be provided with a pair of symmetrical depression plane 7, pressure survey assembly 6 is arranged in the front concave end plane 7 of cylinder body 5, this position is at cylinder body 5 internal piston shells 4, between the impulse stroke of working piston bar 10, depression plane 7 is in the projection in cylinder body axle center drops on the impulse stroke of working piston bar 10 of cylinder body 5 inside, if accompanying drawing 5 is with as shown in accompanying drawing 8, pressure survey assembly 6 comprises the substrate 64 being cascading in the depression plane 7 of cylinder body 5, foil gauge 65, pressure-strain sensor 62 backplates 61 and for the lead-in wire 63 of Output rusults.After rotating, servomotor 13 drives gearing 14, and by driving coupling arrangement 15, the upper end that power is transmitted to the planetary roller screw 12 in screw mandrel shaft block 1 makes its rotation, pass through again adapter flange 2, drive feed screw nut 3 and make its piston shell 4 being integrally connected and 10 working piston bars 10, the interior to-and-fro movement of sliding sleeve 9 on forward flange 8, front end and the distance between buffering ring 11 of feed screw nut 3 in cylinder body 5 are exactly the impulse stroke of working piston bar 10, and pressure survey assembly 6 is arranged between this trip segment distance.
by the following process of principle analysis of the indirect surveying work schematic diagram of Figure 14 electronic press machine pressure: because cylinder body 5 is to be fixed on equipment by forward flange 8, when working piston bar 10 motion front end heads meet obstructions, will produce reacting force conducts on cylinder body 5, will in depression plane 7, produce mechanics of materials stress mechanical deformation, will conduct on the matrix 64 of the pressure transducer 62 in the backplate 61 of pressure survey assembly 6 thereupon, make it matrix 64 material stress deformation, when producing mechanical change, foil gauge 65 also produces and produces deformation simultaneously its resistance is changed, thereby making to be added in ohmically voltage changes, the variation of this resistance is smaller, by go between 63 resistance flow to amplifier again via controller computing be transferred to computer system, realizing indirect pressure survey controls automatically.Because be indirect measurement, greatly improved the serviceable life of pressure transducer, because pressure transducer is directly installed on the outside on cylinder body, can not produce motion, there is not the servo-actuated problem of cable, it is extremely convenient to install simultaneously, detect, dismantle, safeguard, does not relate to and affects the inner any parts of electronic press machine; The indirect metering system of this cylinder body outside at electronic press machine, also cylinder interior structure, mechanism have been changed, traditional bindiny mechanism of pressure transducer is closely dispensed, the simplification that complexity dismounting assembling process is become, greatly reduce production cost and later maintenance cost, realized economy, environmental protection, energy-conservation, practical beneficial effect.
this technology difference with the prior art:
a. prior art is arranged on pressure transducer the inside of cylinder body, and this technology is arranged on pressure transducer the outside of cylinder body;
b. prior art directly acts on cylinder interior pressure sensor by pressure, and this technology is utilized the physical quantity of cylinder block material stress deformation, and the servo-actuated strain signal that is converted into pressure transducer indirectly carries out pressure and connects measurement in cylinder body outside;
c. prior art is arranged on pressure transducer the inside of cylinder body, and assembling, dismounting, maintenance need be decomposed complete machine, and operation is extremely complicated, and this technology is arranged on pressure transducer the outside of cylinder body, assembles, it is intuitively simply very convenient to dismantle, safeguard;
d. the pressure of the electronic press machine of prior art directly acts on pressure transducer, and pressure transducer short need in serviceable life regularly replaces.And the pressure of the electronic press machine of this technology is physical quantity by Cylinder block stress deformation, being transformed into pressure transducer output signal, is indirect measurement, and pressure transducer long service life is not fragile, without replacing;
e. the electronic press machine contour structures of prior art is smooth, and lines are smooth and easy, and the electronic press machine profile of this technology is for setting pressure sensor is ingenious and utilize the material stress of weak part to manifest, the corresponding depression plane arranging outside cylinder body;
f. in prior art electronic press machine cylinder body for arrange setting pressure sensor have a set of centering accurately, manufacture accurate bindiny mechanism's parts.And the pressure transducer of this technology is indirectly measured pressure outside cylinder body, cylinder is interior without any mechanism associated with it.
according to the stressed rear material stress deformation of cylinder body dynamically, to there will be one side be compression on the corresponding two sides of cylinder body, it is to extend that another side is certain to, and measures two variable quantities so simultaneously, through superposition, can guarantee its measuring accuracy.The cylinder body of general electronic press machine is two kinds of structures substantially, rectangular parallelepiped (accompanying drawing 12 and accompanying drawing 13) and right cylinder (accompanying drawing 9 and accompanying drawing 10).Material stress deformation under identical conditions, can obviously be reflected in the weak part of material, at the side opposite the angle place of square cylinder body profile or the tangent line place of the parallel diameter of external diameter of circular cylinder body, get two sections of depression planes that its corresponding position arranges symmetry, equates, is parallel to axle center, the bulk strength of so relative cylinder body in depression plane position is weak part, the matrix face of pressure transducer and its step surface is closely sturdy, and small strain responses is obvious.
can there is stress deformation in cylinder body material under the effect of power, one side is compressed and the deformation of another side extension like this, must be transformed on the matrix of pressure transducer, there is STRESS VARIATION in matrix thereupon, its inner resistance strain gage also produces deformation together, the resistance of foil gauge is changed, thereby make to be added in ohmically voltage, change.Foil gauge on pressure transducer, can experience the physical quantity of regulation, and can change exportable signal, the resistance producing when the servo-actuated reaction that is subject to Cylinder block stress, through signal, amplify and be transferred to controller computing, pass to again computer control system and process the transmission that meets information, store, show, record and control requirement, realize and automatically detect and automatically control.
for ensure electronic press machine external pressure transducer indirect measurement precisely, there is certain restriction condition pressure transducer and cylinder body installation position:
1, the depression plane of the outside setting pressure sensor of cylinder body should be parallel to each other, smooth with cylinder body axle center;
2, the installation of pressure transducer determines that position should be in cylinder body within the scope of the impulse stroke of working piston bar;
3, the depression planar profile of pressure transducer installation position should consistent size, positional structure should be symmetrical;
4, faying face should fit tightly when pressure transducer and depression Plane Installation, and the locking torque coupling of fastening point is corresponding, homogeneous phase is worked as, symmetry equivalent;
5, pressure transducer must be that same specification, same model are symmetrical arranged simultaneously and work.
the relation being directly proportional to pressure according to the mechanics of materials stress deformation of electronics press cylinder body, this technology changes indirect metering system into the direct pressure metering system of electronic press machine, and the key condition changing is the transformation to cylinder body external structure, in the lower end of cylinder body outside, with cylinder in the live corresponding scope position of impulse stroke of working piston, a pair of correspondence is set, the symmetrical depression plane that is parallel to cylinder body axial line, symmetry is installed two pressure transducers for detection of block distortion amount respectively, and be converted to electric signal according to the stack of each pressure transducer different distortion amount, through amplifying, be delivered in control system, block distortion amount to this electronics press is demarcated, obtain force value accurately.The error of indirect side amount is like this substantially the same with the direct survey sensor of conditional electronic press, but but has all beneficial effects that traditional approach cannot be reached, and this object that this technology realizes just.
above embodiment is only explanation technical conceive of the present invention and feature; its object is to allow person skilled in the art understand content of the present invention and implemented; can not limit the scope of the invention with this; all equivalences that Spirit Essence is done according to the present invention change or modify, and all should be encompassed in protection scope of the present invention.
Claims (5)
1. the pressure indirect measurement system of an electronic press machine, for the physical quantity of Cylinder block stress deformation is demarcated, and be converted to electric signal by obtaining force value stack after demarcation, and after amplifying, be delivered in control system, it is characterized in that: described electronic press machine comprises screw mandrel shaft block (1), adapter flange (2), feed screw nut (3), piston shell (4), cylinder body (5), pressure survey assembly (6), depression plane (7), forward flange (8), sliding sleeve (9), working piston bar (10), buffering ring (11), planetary roller screw (12), servomotor (13), gearing (14), drive coupling arrangement (15), described servomotor (13) drives described gearing (14) and drives the upper end of the planetary roller screw (12) in described screw mandrel shaft block (1) to make its rotation by described driving coupling arrangement (15), to-and-fro movement in the piston shell (4) that drives described feed screw nut (3) via described adapter flange (2) again and make to be integrally connected with described feed screw nut (3) and the sliding sleeve (9) of working piston bar (10) on described forward flange (8), the front end of the feed screw nut who is positioned at one end (3) in described cylinder body (5) and the distance definition being positioned between the buffering ring (11) of the other end are the impulse stroke of described working piston bar (10), wherein
On the outer wall of described cylinder body (5), be provided with a pair of symmetrical depression plane (7), the projection of described depression plane (7) in cylinder body axle center drops in the impulse stroke of the inner working piston bar (10) of described cylinder body (5), described pressure survey assembly (6) comprises the substrate (64) being cascading in the depression plane (7) of described cylinder body (5), foil gauge (65), pressure-strain sensor (62) backplate (61) and for the lead-in wire (63) of Output rusults, when described working piston bar (10) front end meets obstructions, the reacting force producing conducts to cylinder body (5) and above produces mechanics of materials stress mechanical deformation in described depression plane (7), substrate (64) material of the pressure-strain sensor (62) in the backplate (61) of described pressure survey assembly (6) synchronously produces stress deformation, described foil gauge (65) thus produce deformation changes its resistance to make to be added in ohmically voltage to change simultaneously, by described lead-in wire (63), resistance is transported to strain bridge and is transferred to through amplifier the automatic control that computer processing system is measured indirectly to realize pressure.
2. the pressure indirect measurement system of electronic press machine according to claim 1, it is characterized in that: described depression plane (7) parallels and surfacing with the axle center of cylinder body (5), described pressure survey assembly (6) fits tightly mutually with depression plane (7).
3. the pressure indirect measurement system of electronic press machine according to claim 1, is characterized in that: the model of the pressure-strain sensor (62) in a pair of symmetrical depression plane (7) is identical respectively.
4. the pressure indirect measurement system of electronic press machine according to claim 1, it is characterized in that: described cylinder body (5) comprises square cylinder body or circular cylinder body, described depression plane (7) is arranged at the tangent line place that is parallel to diameter on the side opposite the angle place of square cylinder body or the external diameter of circular cylinder body.
5. the pressure indirect measurement system of electronic press machine according to claim 1, is characterized in that: described cylinder body (5) is fixed on equipment by forward flange (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210317177.5A CN102818663B (en) | 2012-08-31 | 2012-08-31 | Indirect pressure measuring device of electronic pressure machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210317177.5A CN102818663B (en) | 2012-08-31 | 2012-08-31 | Indirect pressure measuring device of electronic pressure machine |
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| CN102818663A CN102818663A (en) | 2012-12-12 |
| CN102818663B true CN102818663B (en) | 2014-10-15 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110606443A (en) * | 2019-06-11 | 2019-12-24 | 蚌埠学院 | Hydraulic jack with weight display |
| WO2021003669A1 (en) * | 2019-07-09 | 2021-01-14 | 西安交通大学 | Device and method for monitoring oil pressure and air pressure of diaphragm compressor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE10317412A1 (en) * | 2002-04-15 | 2004-02-12 | Tox Pressotechnik Gmbh & Co. Kg | Hydraulic system has a number of hydraulic actuators supplied fro common pressure converter with electromechanical control stages coupled to central unit |
| JP2008290152A (en) * | 2007-05-25 | 2008-12-04 | Tox Pressotechnik Gmbh & Co Kg | Clinching joining method |
| CN201632810U (en) * | 2010-03-23 | 2010-11-17 | 一浦莱斯精密技术(深圳)有限公司 | Servo electronic press machine |
| CN201935761U (en) * | 2010-11-29 | 2011-08-17 | 重庆大学 | Press tonnage monitor |
| CN102632629A (en) * | 2012-04-17 | 2012-08-15 | 西安交通大学 | Miniature table press of ball screw driven by AC servo direct drive motor |
| CN202836840U (en) * | 2012-08-31 | 2013-03-27 | 苏州托克斯冲压设备有限公司 | Pressure indirect measuring device of electronic press |
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