CN2409490Y - Capacitance grid type digital display lever meter - Google Patents

Abstract

The utility model relates to a capacitance grid type digital display lever meter, which is composed of a lever system which is arranged on a base and rotates around an AA shaft, a capacitance grid angular displacement sensor which rotates around a BB shaft, a spring back-zero system, and a measuring and displaying module. The AA shaft is parallel to the BB shaft to satisfy 2 nrlo/8 nli=0.635 mm (0.01 mm resolution) or 0.0635 mm (0.001 mm resolution), and 8N is the total number of electrode grids which a capacitance grid sensor emits. The digital display lever meter of the utility model is that a sensor have no contact friction to have the advantages of stabilization, reliability and long service life, and an LCD module can make 360 DEG rotation and regulates zero position to observe reading number from every direction.

Description

Capacitive grid type digital display lever meter

The utility model relates to a kind of digital display lever meter of measuring micro-displacement, refers to a kind of digital display lever meter of making of the capacitive angular position sensor principle especially.

Lever meter uses easily as a kind of nulling instrument of micro-displacement, is widely used.Gong Ying lever meter is based on mechanical pointer in the market, and pointer form lever meter has simple in structure, and reliable operation does not need power supply to get final product the advantage of work, and its fault is that reading is directly perceived inadequately, can not adapt to modern digitizing.The needs of the measurement control of robotization.For this reason, U.S. numerical check company limited takes the lead in having released a kind of digital display lever meter, the reading LCDs, and has a digital output interface, can be connected with microcomputer and carry out limnograph and condition monitoring, its principle of work is with potentiometer the angular displacement of lever to be transformed into the variable quantity of resistance value and magnitude of voltage, becomes digital quantity to measure demonstration through analog to digital conversion again.The shortcoming of making sensor with potentiometer is to need make metering circuit complicated through analog to digital conversion, and the sliding friction of potentiometer electric contact causes working sensor unstable and the life-span is shorter again easily.

The purpose of this utility model is the deficiency that will overcome existing lever meter, seeks the digital display lever meter of another kind of technical scheme, to simplify circuit and to improve the stability and the mission life of lever meter.Technical scheme of the present invention is:

A kind of digital display lever meter comprises the metering circuit plate, digital display screen and by the lever rotary middle spindle of Bearing Installation on pedestal, this a end is equipped with the measurement lever with measuring contacts, the other end is installed with has shift fork or the gear transmission levers as driving member, by the coupling of shift fork and driving lever or by gear and gear meshing, drive a angular displacement sensor with driving lever or gear, it is characterized in that: the angular displacement sensor by lever drives is the capacitance-grid type angular displacement sensor, and it is to be made of with the face-to-face parallel arranged concentric of certain clearance with moving grid as induction electrode the fixed grid with emitting electrode and receiving electrode.

Moving grid as induction electrode is positioned on the circle rotating disk, rotating disk can rotate relative to pedestal, mounting means has two kinds: a kind of mode is that bearing is housed on the rotating disk, allow rotating disk rotate around an axle that is fixed on the pedestal, its center of rotation axis is perpendicular to the moving grid and the fixed grid face of capacitor grid transducer and pass moving grid and the centre of figure of fixed grid; Another kind of mode is that rotating disk is fixed in the rotating shaft, and this rotating shaft can be rotated relative to pedestal, is mounted with bearing between rotating shaft and pedestal, and its center of rotation axis is perpendicular to the moving grid and the fixed grid face of capacitor grid transducer and pass moving grid and fixed grid and centre of figure.Preceding a kind of mode can only be settled driving lever or gear and transmission levers coupling on rotating disk, a kind of mode in back then both can also can settled the coupling of driving lever or gear and transmission levers in rotating shaft on the rotating disk.

The fixed grid that comprises capacitor grid transducer emitting electrode and receiving electrode is produced on the printed-wiring board (PWB), also make with metering circuit on this printed-wiring board (PWB) and integrated circuit (IC) is installed, crystal oscillator, components and parts such as electric capacity become the fixed grid plate with metering circuit, this has electric between the fixed grid plate of metering circuit and the digital display screen and has two kinds with connected mode machinery: the one, fuse rigidly, the 2nd, fuse flexibly, the 3rd, flexibly connect the fixed grid plate that makes digital display screen can have metering circuit relatively and stir, make things convenient for observer's reading so that regulate the visual angle.

Having first kind of mode that the fixed grid plate of metering circuit is installed on the pedestal is directly to be fixed on the pedestal, when digital display screen and have between the fixed grid plate of metering circuit for being rigidly connected, then the relative pedestal of digital display screen is fixed, when digital display screen and fixed grid plate with metering circuit for flexibly connecting, then digital display screen relatively pedestal stir and regulate the visual angle.Having the second way that the fixed grid plate of metering circuit is installed on the pedestal is to load onto on the pedestal by bearing, can do 360 ° relative to pedestal rotates, this bearing can just be installed in the rotating shaft of the moving grid circle rotating disk that is fixed on the pedestal, also can be contained on other positions of pedestal, but the center of rotation axis with fixed grid plate of metering circuit always will overlap with the center of rotation axis of moving grid circle rotating disk, the center of rotation axis that is to say the fixed grid plate should and pass moving grid and the centre of figure of fixed grid perpendicular to the moving grid and the fixed grid face of capacitor grid transducer, making the fixed grid plate turn to any position is that variation has taken place null position, and the performance parameter of holding gating angular displacement sensor still remains unchanged.Digital display screen and rotating fixed grid plate electric with machinery connected mode can be rigidity also can be flexible, when for being rigidly connected, digital display screen is done 360 ° with the central shaft of fixed grid plate moving grid together and fixed grid relative to pedestal and is rotated, be convenient to come reading from different orientation, when for flexibly connecting, then digital display screen can be done 360 ° with the fixed grid plate relative to pedestal and rotates, and pedestal stirs relatively again, the equal scalable in orientation and visual angle of observing, reading is just more convenient.

Two-sided or the multilayer printed circuit board technology of above-mentioned usefulness fixed grid plate and metering circuit plate the are united two into one scheme of (becoming fixed grid plate) with metering circuit, has sensor and the metering circuit electrical connecting wires is reliable, advantage of simple structure can also reduce the influence of electromagnetic interference (EMI).Another kind of scheme is that the fixed grid plate separates with the metering circuit plate, allow fixed grid plate and moving grid rotating disk form an independently capacitor grid transducer, metering circuit plate and digital display screen fuse and form one and independently measure display module, be electrically connected by cable between the two, the advantage of this scheme is to measure display module to be installed in the constraint that mode on the pedestal is not subjected to sensor, measure display module and can be installed in arbitrary position on the pedestal, can rotate around arbitrary setting shaft and regulate observed bearing, can overturn along arbitrary direction initialization and regulate the visual angle.

Hold gating angular displacement sensor the fixed grid that comprises emitting electrode and receiving electrode and as the shape of the moving grid of induction electrode the most simple and practical be circle, when emitting electrode is 8N, then induction electrode is N, N is a positive integer, the sector angle that each emitting electrode grid is opened is 2 π/8N, for the integrated circuit (IC) that makes common digital display calliper can be used for digital display lever meter, should satisfy 2 π RLo/8NLi=0.635mm (is the lever meter of 0.01mm to resolution) or 2 π RLo/8NLi=0.0635mm (is 0.001mm to resolution), wherein R is the distance of moving grid circle center of turntable to the transmission coupling contact point of transmission levers and angular displacement sensor, Lo is the lever center of rotation to the distance of measuring measuring head contact on the lever, and Li is the lever center of rotation to the be coupled distance of contact point of the transmission of transmission levers and angular displacement sensor.To the shift fork transmission, R is exactly the distance of center of turntable to the driving lever center, and Li is exactly the distance of lever center of rotation to the contact of wishbone lever and driving lever; To meshed transmission gear, R is exactly the reference radius of the follower gear on the sensor, and Li is exactly the reference radius of the driving gear on the transmission levers.

Fig. 1 is the example schematic of appearance of a park gate electrode shape, and the sensor that application appearance grid are made lever meter is a principal character of the present utility model.

Fig. 2 is the 1st embodiment of the present utility model, has illustrated lever in this lever meter, capacitor grid transducer, and the structure of time zero hairspring and LCD display and installation site and shift fork transmission and hairspring return zero the relation of intercoupling.

Fig. 3 is the 2nd embodiment of the present utility model, and the one-piece construction of the lever meter that gone out to anticipate out and gear drive and hairspring return zero the relation of intercoupling.

Fig. 4 be the 3rd embodiment of the present utility model by structural representation, it is characterized in that the shift fork transmission, cross spring returns zero, display screen pedestal relatively rotates any orientation.

Fig. 5 is the structural representation of the 4th embodiment of the present utility model, it is characterized in that the shift fork transmission, and cross spring returns zero, and LCD display is perpendicular to this face of rotation of fixed grid, moving grid plate and lever.

Fig. 6 is the structural representation of the 5th embodiment of the present utility model, it is characterized in that waterproof, grease proofing, the dust seal formula, its LCD display rotate this face relative to lever and have an angle and the relative pedestal of display screen can 360 ° of rotations, the transmission shift fork returns the small incidental expenses cross spring.

Fig. 7 is the structural representation of the 6th embodiment of the present utility model, it is characterized in that the shift fork transmission, and the cross spring with the prepackage of capacitor grid transducer one outside the chamber returns zero, and LCD display is perpendicular to the lever rotational plane.

Fig. 8 is the structural representation of the 7th embodiment of the present utility model, it is characterized by gear and rotates, and the cross spring with the prepackage of capacitor grid transducer one outside the chamber returns zero, and LCD display is perpendicular to the lever rotational plane.

Fig. 9 is the structural representation of the 8th embodiment of the present utility model, it is characterized by gear drive, and the cross spring with the prepackage of capacitor grid transducer one outside the chamber returns zero, and LCD display can be rotated in 270 ° of scopes, and rotating shaft is basically along measuring lever.

The electrode shape of appearance of a park gating angular displacement sensor as shown in Figure 1.Fig. 1 a is fixed grid and the moving grid of N=2, the 101st, and the emission grid, 102 is receiving grid, 103 are the induction grid.Fig. 1 b is fixed grid and the moving grid of N=4, and 111 are the emission grid, and 112 is receiving grid, and 113 are the induction grid.Fig. 1 c is the fixed grid and the moving grid of the another kind of shape of N=4.Be to launch with the place-exchange of receiving grid with Fig. 1 b difference, 121 are the emission grid, and 122 be receiving grid, and 123 for responding to grid.

1 of embodiment of the present utility model sees synoptic diagram 2.The lever system of lever meter can rotate around axle AA, and it cooperates and realize by being contained on the pedestal 203 the no gap of pair of bearings 208 and lever shaft 202.The right and left of lever rotation 202 is separately installed with measures lever 201 and declutch lever 204.The central axis BB of the angular displacement sensor of lever meter parallels with the center of rotation axis AA of lever.The moving grid garden rotating disk 205 of sensor is fixed in the rotating shaft 206, and rotating shaft 206 can be rotated in the precision-fit bearing 207 on being fixed in pedestal 203.Be coupled by the shift fork on driving lever in the rotating shaft 206 and the lever 204, the motion of lever 201 gauge heads just can drive sensor moving grid circle rotating disk 205 and on moving grid PCB2 rotate.Hairspring 209 is installed in the rotating shaft 206, and the other end of hairspring 209 is installed on the bearing seat 207, is used to provide the mechanical recovery force of rotating shaft 206, to keep the stability of moving grid PCB2 mechanical zero.The fixed grid PCB1 of sensor is installed on the pedestal 203, and moving grid PCB2 is bonded on the rotating disk 205, install fixed grid parallel face-to-face with moving grid (all perpendicular to axle BB) and concentric (axle BB passes the centre of figure of fixed grid and moving grid) and a little gap is arranged.The fixed grid of present embodiment and moving grid are the appearance of a park grid of the N=2 shown in Fig. 1 a, gap between moving grid and fixed grid is (0.1 ± 0.05) mm, Li=42mmLo=21mm, R=3.234mm. satisfy 2 π RLo/8NLi=0.635mm, lever meter resolution is 0.01mm, uses the special IC (IC) of common digital display calliper.Printed-wiring board (PWB) PCB1 is except that having made fixed grid, also be manufactured with metering circuit, components and parts such as integrated circuit (IC), crystal oscillator, electric capacity are installed, become fixed grid plate with metering circuit, it and LCDs LCD are electrically connected to connect and together be fixedly mounted on conductive adhesive tape becomes the measurement display module on the plastic housing 210, the relative pedestal 203 of this module is stationkeeping.

2 of embodiment of the present utility model sees synoptic diagram 3.Present embodiment is identical with the structure of lever meter shown in Figure 2, and lever system is made up of the bearing 308 of measuring lever 301, transmission levers 304, lever shaft 302 and cooperate with rotating shaft 302 no gaps.Bearing 308 is packed on the pedestal 303.Lever center of rotation axis AA parallels with angular displacement sensor central axis BB, and the position of both relative pedestals all is changeless.The moving grid garden rotating disk 305 of sensor is fixed in the rotating shaft 306, and rotating shaft 306 cooperates with bearing 307 no gaps on being fixed on pedestal 303, and the center of rotation axis BB of rotating shaft 306 is not drifted about.The two ends of hairspring 309 are contained in respectively on rotating shaft 306 and the bearing seat 307 so that mechanical return-to-zero power to be provided.Moving grid PCB2 is contained on the rotating disk 305, and fixed grid PCB1 is contained on the pedestal 303, installs to such an extent that have a little gap and parallel face-to-face (all perpendicular to BB) concentric (centre of figure is all on a BB line) to become angular displacement sensor between moving grid and fixed grid.By the transmission that is meshed with gear on the lever 304 of the gear in the rotating shaft 306.The motion of lever 301 gauge heads just can drive moving grid PCB2 and rotate.The present embodiment difference from Example 1 mainly is to replace the shift fork transmission with gear drive, makes nonlinearity erron littler, and the calibration garden radius R that rotating shaft 306 cogs can make forr a short time, helps lever meter resolution and improves.Present embodiment N=4, R=0.8, Li/Lo=2.46 satisfies 2 π RLo/8NLi=0.0635mm, and resolution is 0.001mm (LCDs LCD increases to 4-digit number).Another difference is being electrically connected to flexibly connecting (with flexible printed wiring or hot pressing connector) of LCD and the fixed grid plate PCB1 with metering circuit, plastic housing 310 is fixed on the pedestal 303 with PCB1, LCDs LCD is hinged and is contained on the plastic housing 301, make LCDs LCD relatively pedestal stir and transfer the visual angle.

Embodiment 3 of the present utility model sees synoptic diagram 4.The characteristics of present embodiment are that LCDs can be rotated for 360 ° relative to pedestal, so that from different orientation observed reading.The lever system structure of present embodiment lever meter is: lever shaft 405 left and right, both sides are separately installed with measures lever 401 and declutch lever 406, be embedded with a pair of ball bearing 403 in the rotating shaft 405, bearing 403 rotates around being installed in pedestal 407 upper conical pivots 404, pivot 404 usefulness screw threads are installed on the pedestal 407, its depth-adjustment of packing into saves pivot not to be had the gap with ball bearing and cooperates, and guarantees that the relative pedestal of lever pivot center AA fixes.Measure between lever 401 and the lever shaft 405 with being threaded, the centre is separated with a length-adjustable sleeve 402, is accurately to satisfy 2 π RLo/8NLi=0.0635mm in order to guarantee, is used for finely tuning (the center of rotation axis is to the distance of gauge head contact) of Lo.The upper and lower end of the moving grid garden rotating disk 412 of sensor respectively has a taper pivot to cooperate with ball bearing 410,413 no gaps respectively, makes the pivot center BB of rotating disk 412 invariable in rotation process, and is parallel to lever pivot center AA.Bearing 413 is embedded among the fixed grid plate PCB1, the center of bearing 413 overlaps with the fixed grid centre of figure, bearing 410 is packed on the pedestal 407 by screw thread and clamp nut 411, realizes that by the adjusting that is threaded into the degree of depth bearing 410,413 cooperates with the no gap of the pivot of rotating disk 414.Moving grid PCB2 is installed on the rotating disk 412, makes the moving grid face perpendicular to axis BB, and the centre of figure of moving grid is on the BB line.Printed-wiring board (PWB) PCB1 goes up except that the fixed grid of making, and also is manufactured with metering circuit, and components and parts such as integrated circuit (IC), crystal oscillator, electric capacity are installed.This has the fixed grid plate of metering circuit and LCDs LCD and is electrically connected by conductive adhesive tape and connects and together be fixed on the plastic housing 416, moulding shell 416 is installed on the garden annular support 408, support 408 is packed in the pedestal 407, can rotate relative to pedestal, the center of rotation axis of support 408 is perpendicular to the fixed grid face and pass the centre of figure of fixed grid and coincide with the center of rotation axis BB of moving grid garden rotating disk 414.Moving grid and fixed grid hold gating angular displacement sensor parallel face-to-face the be made up of a little gap, and driving lever 409 is arranged on the rotating disk 412, and by driving lever 409 and shift fork 406 coupled drive, sensor just can be monitored the displacement of lever 401 gauge heads.The mechanical return-to-zero system of lever meter is made up of spring 414, two zero-bit levers 415 and reversed column 416, cross spring is clipped on the reversed column 416 during zero-bit, also be pressed in simultaneously on two levers 415, the restoring force of lever balancing spring and keep zero-bit, when rotating disk 414 rotates to any direction, reversed column just departs from zero-bit, and an end of spring 414 leaves reversed column 416, the other end leaves lever 415, just produces the return-to-zero restoring force.

4 of embodiment of the present utility model sees synoptic diagram 5.The LCDs of present embodiment is vertical mutually with the rotational plane of lever.Lever system is made up of with declutch lever 506 rotating shaft 505 and the gauge head lever 501 that is installed in rotating shaft 505 the right and lefts.Rotating shaft 505 has a pair of taper pivot to cooperate with a pair of ball bearing 504, bearing 504 usefulness screw threads and clamp nut 503 are fixed tightly on the pedestal 507, the screw-in depth that screw thread is installed is regulated and can be made pivot and ball bearing realize that no gap cooperates, and guarantees that the position of the relative pedestal of its pivot center AA when rotating shaft 505 is rotated can not become.Gauge head lever 501 also is contained in the rotating shaft 505 with screw thread, and length-adjustable sleeve 502 is enclosed within on 501 the installation screw thread in order to fine setting distance L o, makes and accurately satisfies 2 π RLo/8NLi=0.0635mm.The moving grid garden rotating disk 512 center pit above and below of sensor are taper, and loading onto ball just becomes a pair of ball bearing, and the stationary shaft 513 of packing in the bearing can rotate dish 512 around axle 513.Axle 513 1 ends have umbrella hat, and the other end has nut to be used for being packed on the bearing support 509, by regulating the screw-in depth of screw thread, can realize that not having the gap cooperates between ball bearing and the axle, and when making rotating disk 512 rotations, pivot center BB immobilizes to bearing support.Bearing support 509 is contained on the pedestal 507, makes axis BB parallel with axis AA.Moving grid plate PCB2 is contained on the rotating disk 512, install moving grid face vertical axis BB, the centre of figure of moving grid is on the BB axis, fixed grid PCB1 is fixed on the axle 513, install axis BB perpendicular to the fixed grid face and pass the centre of figure of fixed grid.This just guarantees that moving grid and fixed grid are parallel and concentric, and the gap little that makes it again to keep face-to-face constitutes capacitor grid transducer.One driving lever 508 is arranged on the rotating disk 512, by driving lever 508 coupling with declutch lever 506, the moving grid that the displacement of lever 501 gauge heads will transmission sensors and being monitored.The machinery of lever meter goes back to zero system by being installed in the clear spring 514 on the bearing support 509 and being contained in two eccentric shelves posts 515 on the pedestal 507, and the driving lever on the rotating disk 512 508 constitutes.The driving lever 508 had here not only been driven but also had stirred spring by shift fork.Eccentric shelves post 515 is to be contained on the pedestal 507 with screw thread, change the installation position (rotation screw thread) of biasing post, can make the cross spring 514 that is clipped in driving lever 508 just in time tangent during zero-bit, guarantee the accurate zero-bit of lever meter with the variation of eliminating mechanical zero with two shelves posts 515.On the 3rd bar printing wiring board PCB3 switch is installed, no device such as battery, components and parts such as integrated circuit (IC), crystal oscillator electric capacity both can be contained on the PCB3, also can be contained on the fixed grid PCB1.PCB3 and LCDs LCD are electrically connected to connect to be packed in the lump to mould on the shell on 516 with conductive adhesive tape becomes display module, this module is contained in and makes LCD display vertical with the lever plane of rotation on the pedestal 507, thereby PCB1 and PCB3 two printed-wiring board (PWB)s have 90 ° of angles, the electric connecting mode of PCB1 and PCB3 can be used flexible cable, and flexible printed wiring or hot pressing connector (zebra paper) etc. flexibly connects.

5 of embodiment of the present utility model sees synoptic diagram 6, and the characteristics of present embodiment are that the relative lever motion face of LCDs has an angle, and display screen can 360 rotates relative to pedestal, makes that observing display screen from different directions all can be transferred to optimal viewing angle.The lever system of the lever system of present embodiment and embodiment 4 is identical, and Fig. 6 sign 601～606 is corresponding diagram 5 signs 501～506 one by one.Present embodiment and embodiment 4 great differences.Be: axle 513 is to be fixed on the bearing support 509, and axle 613 can rotate relative to bearing support 609.Three ball bearing in upper, middle and lower are housed on axle 613.Two ball bearing cooperate with rotating disk 612 upward,, in, following two ball bearing cooperate with bearing support 609, make rotating disk 612 can be around the shaft 613 rotations, rotating shaft 613 again can be around bearing support 609 rotations that are fixed on screw 611 on the pedestal 607, the adjusting of nut 611 screw-in depths can make three ball-bearings with taper bore in upper, middle and lower all realize not having the gap cooperation, guarantee that the center of rotation axis that center of rotation axis that rotating disk 612 rotates relative to pedestal and rotating shaft 613 are rotated relative to pedestal is with single line BB, BB parallels with AA.Fixed grid plate PCB1 is packed on the rotation axis 613, moving grid plate PCB2 is packed on the rotating disk 612, fixed grid and the moving grid installed have one gap face-to-face, and center of rotation axis BB is perpendicular to moving grid and fixed grid face and pass moving grid and the centre of figure of fixed grid, constitute one and hold gating angular displacement sensor, the fixed grid of this sensor can 360 ° of rotations change mechanical zero, and does not change any other characterisitic parameter of sensor.Transmission between lever system and the angular displacement sensor is to realize satisfying 2 π LoR/8NLi=0.635mm by 608 couplings of the driving lever on shift fork on the declutch lever 606 and the rotating disk 612, be distinguished as 0.01mm, present embodiment returns that zero system and example example 4 are identical to be made of clear spring 614, driving lever 608 and two eccentric grade posts 615.Fixed grid plate PCB1 goes up and also is manufactured with metering circuit except that being manufactured with fixed grid, and components and parts such as integrated circuit (IC), crystal oscillator, electric capacity are installed, and becomes to have metering circuit the fixed grid plate is arranged.This fixed grid plate and LCDs LCD be with there being the conductive adhesive tape on an inclined-plane to be electrically connected, and both keep certain included angle to be packed in the lump moulding becoming the measurement display module in the shell 616.Present embodiment with embodiment 4 another differences is: mould measurement display module in the shell 616 and not only can do 360 ° relative to pedestal and rotate but also module itself seals, on the pedestal 607 packer ring 617 and caulking gum bowl 618 are arranged again simultaneously, when module 616 rotations and lever 601 motions, can prevent that still oil, water, dust from entering lever meter inside, guarantee in the environment that pollutants such as oil, water, dust are arranged, to work reliably by the capacitor grid transducer that PCB1 and PCB2 form.

6 of embodiment of the present utility model sees synoptic diagram 7.701～706 is lever system, identical with the lever system 501～506 of embodiment 4.Driving lever 708 coupled drive on shift fork on the declutch lever 706 and the rotating disk 712 make the motion of measuring the lever contact drive moving grid garden rotating disk 712 and rotate.Rotating disk 712 upper and lower surfaces respectively have bellmouth, cooperate with umbrella shape axle 713 through ball, the screw thread of axle 713 lower ends is contained on the bearing support 709,711 fastening and regulating actions of nut, make ball cooperate with dish 712 and axle 713 no gaps, guarantee that the relative pedestal of the center of rotation axis BB of rotating disk 712 707 is invariable and BB bearing support 709 is contained on the pedestal 707 by screw 710, and parallel with the center of rotation axis AA of lever, satisfy 2 π RLo/8NLi=0.635mm, the resolution of lever meter is 0.01mm.Moving grid and fixed grid keep an about 0.1mm in little gap face-to-face and make center of rotation axis BB pass the centre of figure of moving grid and fixed grid perpendicular to moving grid and fixed grid face, hold gating angular displacement sensor thereby constitute.The machinery of lever meter goes back to zero system and is made up of clear spring 714, driving lever 708 and two link stoppers 715.5 differences are that link stopper 715 is not directly to be contained on the pedestal 707 with implementing then with embodiment 4, but be contained on the bearing support 709, link stopper can rotate around center pit C and regulate, the knob that makes the link stopper front end when zero-bit just with spring 714 tangent contacts, link stopper 715 is fastened on the bearing support 709 with screw in C, D two holes again after mixing up, spring 714 1 ends are clipped on the bearing support 709 with briquetting 717, this time zero system can regulate earlier outside pedestal, then bearing support upper sensor and time zero entire system are put into the basis seat, installation is regulated more convenient.On the fixed grid plate PCB1 of present embodiment metering circuit is arranged and components and parts such as integrated circuit (IC), crystal oscillator, electric capacity are installed, fixed grid plate PCB1 is packed on the axle 713.Printed-wiring board (PWB) PCB3 is contained in and moulds on the shell 716, and components and parts such as switch, battery are installed on the PCB3, and LCDs LCD also is installed in and moulds on the shell 716, and PCB3 and LCD are electrically connected with conductive adhesive tape and connect.Being electrically connected between orthogonal PCB1 and the PCB3 is the direct soldering of adopting 90 ° of corners.A part of area of PCB1 and PCB2 is the interior height with reduction lever meter integral body of opening slot that has been inserted into PCB3, and the useful area that can not reduce fixed grid and moving grid like this is to keep the sensitivity of sensor.Cover plate 718 is installed on the pedestal 707, and the sound hole on the cover plate 718 embeds the umbrella hat of axle 713, makes axle 713 two ends fixedly be difficult for rocking, and cover plate 718 plays the protection capacitor grid transducer simultaneously.

7 of embodiment of the present utility model sees synoptic diagram 8.The one-piece construction of present embodiment and example 6 is basic identical.Lever system 701～706 differences of lever system 801～806 and Fig. 7 are 706 to be shifting fork bar, and 806 is lever gear.Be produced in the rotating shaft 813 with the follower gear 810 of lever and gear wheel engagement, rotating disk 812 usefulness screw threads are packed in the rotating shaft 813 and rotate with rotating shaft.Be manufactured with a pair of conical surface ball-bearing housing on rotating shaft 813 and the bearing support 809 and screw rotating disk 812 and can make ball bearing not have the gap to the rotating shaft 813 to cooperate, the center of rotation axis BB of rotating shaft 813 in rotation process relatively bearing support 809 positions keep invariable.Bearing support 809 is fastened on the pedestal 807 by screw, makes the BB parallel axes satisfy 2 π RLo/8NLi=0.0635mm in the AA axis, and resolution is 0.001mm.Moving grid plate PCB2 is packed on the rotating disk 812, and axis BB is perpendicular to the moving grid face and pass the centre of figure of moving grid.Fixed grid plate PCB1 is packed on the cover plate 818, and cover plate 818 is packed on the pedestal 807, makes fixed grid and moving grid keep face-to-face a little gap and allows axis BB pass the centre of figure of fixed grid perpendicular to the fixed grid face, holds gating angular displacement sensor thereby constitute.Time zero system of lever meter is identical with embodiment 6, form by be pressed in the spring 814 on the support 809, the driving lever 808 on the rotating disk 812 and two adjustable link stoppers 815 that are contained on the bearing support 809 with briquetting 817, just driving lever 808 is only stirred spring 814 now, is not re-used as the driving member with the lever coupling.Printed-wiring board (PWB) PCB3 and LCDs LCD are electrically connected to be packed in the lump to mould with conductive adhesive tape to be become this module of display module and is fixed on the pedestal 807 on the shell 816.Have groove on the printed-wiring board (PWB) PCB3, can allow the part area of rotating disk and moving grid PCB2 enter in the groove and rotate, the part area of fixed grid plate PCB1 is also in the insertion groove.Being electrically connected with 90 ℃ of direct soldering switches of corner of mutually perpendicular PCB3 and PCB1 is contained on the PCB3, and components and parts such as battery, integrated circuit (IC), crystal oscillator, electric capacity both can be installed on the PCB1 and also can be installed on the PCB3.

8 of the utility model embodiment sees synoptic diagram 9.The lever system of present embodiment, it is all identical with enforcement 7 that capacitor grid transducer measuring system and machinery go back to zero system, satisfies 2 π RLo/8NLi=0.0635mm equally, and resolution also is 0.001mm.Difference is just different with the installation site of moulding the measurement display module that shell 916 forms by PCB3 LCDs LCD, the display module of present embodiment is installed in the rear portion of pedestal, make display screen be approximately perpendicular to gauge head lever 901, the lever meter read-around ratio of (as be deep in the hole slot measure) this structure is more convenient in some application scenarios.Present embodiment wiring board PCB3 and fixed grid plate PCB1 are electrically connected with flexible cable 919.Module 916 is fixed on the plate 921, and plate 921 can be that rotating shaft is rotated relative to pedestal 907 with axle 920, and flexible cable fills perhaps that its slewing area is 270 °, can observe display screen from each orientation easily.

Capacitive grid type digital display lever meter of the present utility model is to existing potentiometer type digital display lever meter And improvement, its advantage is: 1, because capacitor grid transducer does not have the friction electricity of potentiometer pick-off to connect The contact so that its stability and the life-span all be better than potentiometric transducer; 2, appearance of a park gate sensor Fixed grid arbitrarily angled along the rotating shaft of moving grid after, except other characteristics ginsengs that change the zero-bit outer sensor Number can not change, and this not only can be used to regulate mechanical zero, and combines with electricity zeroing position, Can be so that the LCD display that is connected with the fixed grid plate rotates to any direction, so that each orientation Observer's reading. Existing potentiometer type digital display lever meter, the resistance stator of potentiometer can not Careless rotation, each orientation observed reading is the different directions peace at a lever meter for convenience Fill two display screens. Fall with the numeral of numeral reversing reading circuit and switch control display screen simultaneously Turn to 180 ° of demonstrations. Obviously, the method for rotary display screen wants much simple and practical; 3, of the present invention Capacitive grid type digital display lever meter is by selecting suitable lever ratio Li/Lo and gearratio R/Li satisfies 2 π RLo/8NLi=0.635mm or 0.0635mm, just can directly use usually The measuring circuit IC that the special IC of digital display calliper (IC) is made lever meter can save out The expense of sending out IC new. In sum, digital display lever meter of the present utility model is than existing digital display lever The table frame for movement and circuit all simpler, stability is higher, the life-span is longer, production and development Cost is lower, is suitable for commercial Application.

Claims (11)

1, a kind of digital display shows lever meter, have angular displacement sensor, digital display screen, metering circuit plate and by the lever rotary middle spindle of Bearing Installation on pedestal, lever rotary middle spindle one end is equipped with the measurement lever with measuring contacts, the other end is equipped with the transmission levers with mechanical transmissioning piece, is used for driving angular displacement sensor.It is characterized in that: the angular displacement sensor by lever drives is the capacitance-grid type angular displacement sensor, and it constitutes with the face-to-face parallel arranged concentric of certain clearance by the fixed grid that comprises emitting electrode and receiving electrode with as the moving grid of induction electrode.

2, digital display lever meter according to claim 1 is characterized in that: moving grid is arranged on the round rotating disk by lever drives, this rotating disk rotates around an axle that is fixed on the pedestal, be mounted with bearing between rotating disk and the axle, its center of rotation axis is perpendicular to moving grid and fixed grid face and pass moving grid and the centre of figure of fixed grid.

3, digital display lever meter according to claim 1 is characterized in that: moving grid is arranged on the round rotating disk by lever drives, this rotating disk is fixed in the rotating shaft, this rotating shaft can be rotated relative to pedestal, be mounted with bearing between rotating shaft and the pedestal, its center of rotation axis is perpendicular to moving grid and fixed grid face and pass moving grid and the centre of figure of fixed grid.

4, digital display lever meter according to claim 1 is characterized in that: comprise the emitting electrode of capacitor grid transducer and the fixed grid of receiving electrode, be produced on the bar printing wiring board, also be manufactured with metering circuit on this printed-wiring board (PWB) and components and parts such as integrated circuit (IC), crystal oscillator, electric capacity are installed, the fixed grid plate of this band metering circuit and digital display screen be electric to be gone up and mechanically fuses and be fixed on the pedestal.

5, digital display lever meter according to claim 1 is characterized in that: comprise the emitting electrode of capacitor grid transducer and the fixed grid of receiving electrode, be produced on the bar printing wiring board, also be manufactured with metering circuit on this printed-wiring board (PWB) and components and parts such as integrated circuit (IC), crystal oscillator, electric capacity are installed, the fixed grid plate of this band metering circuit is fixedly mounted on the pedestal, the fixed grid plate of digital display screen and this band metering circuit electric with machinery connected mode be to flexibly connect, make digital display screen relatively the fixed grid plate of this band metering circuit stir.

6, digital display lever meter according to claim 1 is characterized in that: comprise the emitting electrode of capacitor grid transducer and the fixed grid of receiving electrode, be produced on the bar printing wiring board, also be produced on metering circuit on this printed-wiring board (PWB) and integrated circuit (IC) is installed, crystal oscillator, components and parts such as electric capacity, mechanically fuse on the fixed grid plate of this band metering circuit and digital display screen are electric and become the measurement display module, this module can be done 360 ° relative to pedestal and rotate, and its center of rotation axis is perpendicular to the moving grid and the fixed grid face of capacitor grid transducer and pass moving grid and the centre of figure of fixed grid.

7, digital display lever meter according to claim 1 is characterized in that: the fixed grid that comprises capacitor grid transducer emitting electrode and receiving electrode, be produced on the bar printing wiring board, also be manufactured with metering circuit on this printed-wiring board (PWB) and components and parts such as integrated circuit (IC), crystal oscillator, electric capacity are installed, fixed grid plate and the digital display screen of this band metering circuit electric with mechanically be connected with flexible way, make digital display screen relatively this band metering circuit fixed grid plate stir.It is can do 360 ° relative to pedestal together rotate that the fixed grid plate and the digital display screen of this band metering circuit is installed in mode on the pedestal, and its center of rotation axis is perpendicular to the moving grid and the fixed grid face of capacitor grid transducer and pass moving grid and the centre of figure of fixed grid.

8, digital display lever meter according to claim 1, it is characterized in that: the metering circuit plate of components and parts such as integrated circuit (IC), crystal oscillator, electric capacity and digital display screen are installed form a measurement module independently, this module is to be connected as flexible electric with cable with being electrically connected of gating angular displacement sensor of appearance.This module is installed in the constraint that mode on the pedestal is not subjected to sensor, can be installed in arbitrary position on the pedestal, rotates around arbitrary setting shaft, stirs along arbitrary direction initialization.

9, digital display lever meter according to claim 1 is characterized in that: the fixed grid of capacitance-grid type angular displacement sensor and moving grid are garden shape, comprise a garden ring-type receiving electrode and 8N fan-shaped emitting electrode on the face of fixed grid garden.The sector angle that each emitting electrode grid is opened is 2 π/8N, N induction electrode arranged on the face of moving grid garden, the sector angle of being opened with the corresponding part of receiving electrode on the induction electrode is 2 π/N, the sector angle of being opened with the corresponding part of emitting electrode on the induction reward electrode is 2 pi/2 N, N is a positive integer, for the lever meter of resolution 0.01mm, satisfies 2 π RLo/8NLi=0.635mm, be the lever meter of 0.001mm for explanation, satisfy 2 π RLo/8Nli=0.0635mm.Wherein Lo is that the lever center of rotation is to the distance of measuring measuring head contact point on the lever, Li is the distance of lever center of rotation to transmission levers and angular displacement transmission coupling contact point, and R is the distance of dial rotation center, moving grid garden to the transmission coupling contact point of transmission levers and angular displacement sensor.

10, digital display lever meter according to claim 2 is characterized in that: the driving member on the lever of driving angular displacement sensor is a shift fork, on moving grid circle rotating disk a driving lever that cooperates with this shift fork is installed, the pivot center of moving grid garden rotating disk is parallel to lever center of rotation axis.

11, digital display according to claim 3 shows that lever meter is characterized in that: the driving member on the transmission levers of drive angular displacement sensor is a driving gear, the rotating shaft that is fixed with moving grid circle rotating disk is provided with the follower gear that meshes with this driving gear, and the pivot center that is fixed with the rotating shaft of moving grid garden rotating disk is parallel to the center of rotation axis of lever.

Images