WO2001042734A1

WO2001042734A1 - Capacitive digital display type measuring instrument

Info

Publication number: WO2001042734A1
Application number: PCT/CN2000/000574
Authority: WO
Inventors: Qiliang Chen; Shaoguang Chen; Haiping Liu
Original assignee: Qiliang Chen; Shaoguang Chen; Haiping Liu
Priority date: 1999-12-12
Filing date: 2000-12-12
Publication date: 2001-06-14
Also published as: WO2001042734A8; CN1299955A

Abstract

This invention relates to a Capacitive Digital Display Type Measuring Instrument comprising a lever system. The lever system comprises a base, a rotary central spindle fixed on the base, a first lever provided the outside of the base, a second lever provided the inside of the base, a reset mechanism making the lever system reset, a measuring sensor coupled with the second lever, and a digital display. The measuring sensor has a rotary device which consists of a shift connecting with the base; a connector coupling with a drive device; and a movable plate with induced electrodes on it and a fixed plate with transmission and receive electrodes on it.

Description

Capacitive digital display measuring instrument

The invention relates to a digital display lever meter for measuring minute displacement, in particular to a digital display lever meter manufactured by using the principle of a capacitive angular displacement sensor. Background technique

Lever meter is a kind of zero displacement meter with small displacement. It is very convenient to use and has been widely used. At present, the lever meters on the market are mainly mechanical pointer type. The pointer type lever meter has the advantages of simple structure, reliable operation and no power supply. It has the disadvantages that the readings are not intuitive and cannot adapt to modern digitalization and The need for automated measurement control. For this reason, American Digital Inspection Co., Ltd. first introduced a digital display lever meter with a liquid crystal display for reading and a digital output interface. It can be connected to a microcomputer for automatic measurement recording and status monitoring. Its working principle is to use a potentiometer The amount of angular displacement of the lever is converted into the change amount of the resistance value and the voltage value, and then converted to a digital quantity by the analog to digital for measurement display. The disadvantage of using a potentiometer as a sensor is that the measurement circuit needs to be complicated by analog-to-digital conversion. The sliding friction of the potentiometer's electrical contacts can easily cause the sensor to be unstable and have a shorter life.

In addition, in this prior art digital display lever meter, the resistance plate of the potentiometer cannot be rotated arbitrarily. Therefore, in order to facilitate the observation of readings in various positions, two display screens are installed in different directions of a lever meter; at the same time, the numbers are inverted. Digital inversion of reading circuit and switch control display

180. To read the display. However, this is still not convenient for people to measure. Disclosure of invention

The purpose of the present invention is to provide a digital display lever meter with an angular displacement sensor. The mechanical transmission between the lever systems is used to drive the rotation of the grid turntable, so that the angular displacement sensor of the present invention can directly pick up the displacement signal. , Simplifies the circuit and improves the stability and working life of the lever meter. Another object of the present invention is to provide a digital display lever meter. The housing for fixing the digital display screen can be rotated relative to the base, which is convenient for observers of various positions to read.

The present invention is implemented through the following technical solutions:

According to one aspect of the present invention, since the capacitive grid sensor of the present invention rotates the moving grid turntable relative to the fixed grid, there is no triboelectric contact point of the potentiometer sensor, so that its stability and life are better than that of the potentiometer sensor; meanwhile, The invention directly converts a mechanical signal into a digital signal through an angular displacement sensor. The digital display lever meter of the present invention is simpler, more stable, and has a longer life than the mechanical crusts and circuits of the existing digital display lever meter.

According to another aspect of the present invention, after the fixed grid of the capacitive grid sensor is rotated through an arbitrary angle along the rotation axis of the moving grid, other characteristic parameters of the sensor will not be changed except for changing the zero position, which can not only be used to adjust the mechanical zero position, but also Combined with electrical zero adjustment, the LCD display integrated with the fixed grid can be rotated to any direction. In addition, the present invention can also separate the fixed grid plate from the measurement circuit board, so that the fixed grid plate and the moving grid turntable form an independent capacitive grid sensor, and the measurement circuit board and the digital display screen are integrated into an independent measurement display module. The two are electrically connected by a cable. The advantage of this solution is that the way the measurement display module is mounted on the base is not constrained by the sensor. The measurement display module can be installed on any position on the base and can be set around any set axis. Rotate to adjust the viewing direction, and flip in any set direction to adjust the viewing angle. In this way, the present invention facilitates reading by observers in various positions, and increases the practicability of the digital display lever meter of the present invention.

According to another aspect of the present invention, the present invention uses a double-sided or multi-layer printed circuit board technology to combine a fixed grid plate with a measurement circuit board, and is designed as a fixed grid plate with a measurement circuit. It has the characteristics of reliable line and simple structure, and can also reduce the influence of electromagnetic interference.

According to yet another aspect of the present invention, the digital display lever meter of the present invention can directly use an application specific integrated circuit (IC) of a general digital measuring tool to measure the lever meter by selecting an appropriate lever ratio and transmission ratio R / L i. The circuit IC can save the cost of developing a new IC, effectively reduce the production and development costs, and is used in industrial applications. The tube of the drawings is to be explained

The following describes the preferred embodiments of the present invention with reference to the accompanying drawings to make the foregoing advantages and technical solutions of the present invention obvious.

FIG. 1A shows an embodiment of a fixed grid of an angular displacement sensor according to the present invention, which has a ring-shaped receiving electrode and a certain-pattern emitter;

FIG. 1B shows a moving grid that cooperates with the fixed grid shown in FIG. 1A and has two sensing poles. FIG. 1C is another embodiment of the fixed grid of the angular displacement sensor of the present invention, which has a ring-shaped receiving pole and A certain pattern of emitters;

FIG. 1D is a movable grid matched with a fixed grid shown in FIG. 1C, which has four induction poles;

FIG. 1E is another embodiment of the fixed grid of the angular displacement sensor according to the present invention, which has a ring-shaped receiving electrode and a certain pattern of the emitter, wherein the receiving electrode is disposed inside the emitter; FIG. 1F is a view of the fixed electrode shown in FIG. 1E Grid-matching moving grid with four induction poles;

FIG. 2A is a schematic diagram of the internal structure of a first embodiment of a capacitive grid digital display lever meter according to the present invention; FIG.

FIG. 2B is a schematic diagram of the cooperation between the angular displacement sensor and the fork lever of the present invention shown in FIG. 2A;

2C is an external view of the lever meter shown in FIG. 2A, showing a digital display screen provided on the base;

FIG. 3A is a schematic diagram of the overall internal structure of a second embodiment of a capacitive grid digital display lever meter according to the present invention; FIG.

FIG. 3B is a schematic plan view of the cooperation between the angular displacement sensor and the gear lever of the present invention shown in FIG. 3A;

3C is an external view of the lever meter shown in FIG. 3A, showing a digital display screen provided on the base;

3D is a schematic diagram of a digital display screen arranged outside the housing by the lever meter shown in FIG. 3A, wherein the digital display screen is connected to the housing by a pivot;

FIG. 4A is the overall interior of a third embodiment of a capacitive grid digital display lever meter of the present invention Fig. 4B is a schematic plan view of the return-to-zero system of the embodiment shown in Fig. 4A;

4C is an external view of the lever meter shown in FIG. 4A, showing a digital display screen provided on the base;

FIG. 5A is a schematic diagram of the overall structure of a fourth embodiment of a capacitive grid-type digital display lever meter according to the present invention, wherein the rotation device of the angular displacement sensor is fixed to the base by using a support frame; A schematic plan view of the zero return system of the embodiment, in which a transmission post of an angular displacement sensor is used to form a dial;

FIG. 5C is a schematic view of a crust of a housing with a digital display screen fixed in the embodiment shown in FIG. 5A; FIG. 5D is an external view of the lever meter shown in FIG. 5A, showing the digital display screen provided on the base;

FIG. 6A is a schematic diagram of the overall structure of a fifth embodiment of a capacitive grid digital display lever meter according to the present invention, in which the digital display screen is tilted in the housing; FIG.

FIG. 6B is a schematic plan view of the zero return system of the embodiment shown in FIG. 6A, and a transmission post of the angular displacement sensor is used to form a shifting post;

6C is an external view of the lever meter shown in FIG. 6A, showing a digital display screen provided on the base;

FIG. 7A is a schematic diagram of the overall structure of a sixth embodiment of a capacitive grid type digital display lever meter according to the present invention, in which a digital display screen and a rotation surface of a lever system are disposed vertically;

7B is a schematic plan view of the zero return system of the embodiment shown in FIG. 7A;

FIG. 7C shows a digital display screen of the embodiment shown in FIG. 7A;

FIG. 8A is a schematic diagram of the overall structure of a seventh embodiment of a capacitive grid type digital display lever meter according to the present invention, in which a driven gear meshing with a lever gear is provided on a shaft member;

FIG. 8B is a schematic plan view of the cooperation between the angular displacement sensor and the gear lever of the present invention shown in FIG. 8A;

FIG. 8C is a schematic diagram of the embodiment shown in FIG. 8A, which shows a zero return system; FIG. 8D shows a digital display provided perpendicular to the rotation plane of the lever in the embodiment shown in FIG. 8A Screen;

FIG. 9A is a schematic diagram of the overall structure of an eighth embodiment of a capacitive grid-type digital display lever meter according to the present invention, in which a housing for fixing a digital display screen is disposed at an end of a base using a rotating shaft; FIG. 9B FIG. 9A is a schematic plan view showing that the angular displacement sensor of the present invention cooperates with a gear lever shown in FIG. 9A;

9C is a schematic plan view of a digital display screen of the embodiment shown in FIG. 9A;

Fig. 9D is an external view of the embodiment shown in Fig. 9A. The best way to implement the invention

Hereinafter, the present invention will be described in detail.

The capacitive grid angular displacement sensor includes a fixed grid of a certain number of transmitting and receiving electrodes, and a moving grid as a sensing electrode. In fact, the simplest and most practical shape of a moving grid and a fixed grid is circular. If there are N sensing electrodes, N is a positive integer. When the number of transmitting electrodes is 8N, the sector angle of each transmitting electrode grid is 2 7Γ / 8N. As shown in Figure 1B, the sensing electrodes 103 of the moving grid are distributed along its circumference, and the number of sensing poles is N = 2. At this time, the fixed grid shown in Figure 1A should include 16 transmitting electrodes 101, and the receiving electrode 102 should also be It is distributed along the circumference and corresponds to the sensing electrode 103.

Figure 1 (: ~ 1D shows the fixed grid and moving grid with the number of sensing poles N = 4, and the sensing grid 1 13 is still distributed along the circumference of the moving grid. At this time, the number of transmitting grids 1 1 1 should be 32. The grids 1 12 also need to be arranged along the circumference.

Figures 1 ~ 1F show fixed and moving grids of another shape with the number of sensing poles N = 4. The difference from the embodiment shown in FIG. 1 (~ 1D) is that the positions of the transmitting and receiving grids are exchanged. The transmitting grid 121 is arranged along the circumference, and then the receiving grid 122 needs to be disposed inside the transmitting grid, and 123 is an induction grid.

The schematic diagram of the digital display lever meter 20 of the first preferred embodiment of the present invention is shown in FIG. 2k. First, the lever system of the capacity grid digital display lever meter 20 includes a rotating central shaft 202, the ends of which are fixed to a base 203 with bearings 208, respectively; The outside of the base 203 has a measuring contact 21 1 on one end, and the other end is fixed to the rotation central shaft 202; and a transmission lever 204 is provided in the cavity of the base 203, using a An end portion is fixed to the rotation central shaft 202, and a transmission member 212 is provided on the other end portion thereof. The lever system of the lever meter 20 is rotatable around the axis A-A by the clearance-free cooperation of a pair of bearings 208 and the lever rotating shaft 202 mounted on the base 203.

The center axis line B-B of the angular displacement sensor 200 of the present invention is parallel to the rotation center axis A-A of the lever, as shown in FIG. 2A. The sensor 200 includes a rotating device, provided with a shaft member 206, fixed to the base 203 through a bearing 207, and a connecting member 216, which is coupled to the transmission member 212; a moving grid 215, and a shaft 206 through a rotating turntable 205 Coaxially fixed; and a certain grid plate 2U, concentrically opposed to the moving grid 215 at a certain distance. In this embodiment, the transmission member 212 of the transmission lever 204 is a fork member, which is coupled to the shift lever 216, as shown in FIG. 2B. The moving grid turntable 205 is fixed on a rotating shaft 206, and the rotating shaft 206 can rotate in a precision-fit bearing 207 fixed on the base 203. By coupling the shift lever 216 on the rotating shaft 206 with the shift fork 212 on the lever 204, the movement of the lever 201 and the probe 21 1 can drive the sensor moving grid disc 205 and the moving grid 215 thereon to rotate.

In the above-mentioned first preferred embodiment of the present invention, the return-to-zero system of the lever meter is arranged such that a hairspring 209 is installed on the rotating shaft 206, and the other end of the hairspring 209 is installed on the bearing seat 207 for providing the rotating shaft 206 mechanical restoring force to keep the moving grid 215 mechanical zero position stability.

A housing 210 for fixing the digital display screen 213 is disposed on the base 203, and at the same time covers the fixed grid plate. In this embodiment, in addition to the fixed grid, the printed circuit board is also manufactured with a measurement circuit. Components such as an integrated circuit (IC), a crystal oscillator, and a capacitor are installed to form a fixed grid board 214 having a measurement circuit. The digital display screen 213 is electrically connected with a conductive adhesive strip and is fixedly installed on the plastic case 210 to become a measurement display module. The module is fixed in position relative to the base 203, as shown in FIG. 2C.

A digital display lever meter 30 according to a second preferred embodiment of the present invention is shown in FIG. 3A. The result of the lever table shown in FIG. 3A is basically the same as that of the lever table 20 shown in FIG. 2A. The lever 301, the transmission lever 304, the lever rotating shaft 302, and the bearing 308 which cooperates with the rotating shaft 302 without any clearance. The bearing 308 is fixed on the base 303. The central axis A-A of the lever rotation is parallel to the central axis B-B of the angular displacement sensor 300, and their positions relative to the base are fixed. The moving grid turntable 305 of the sensor 300 is fixed on the rotating shaft 306, and the rotating shaft 306 and the bearing 307 fixed on the base 303 cooperate with each other without clearance, so that the rotation center axis B-B of the rotating shaft 306 does not drift. The two ends of the hairspring 309 are respectively mounted on the rotating shaft 306 and the bearing seat 307 to provide a mechanical resetting force. The moving grid 315 is mounted on the turntable 305, and the fixed grid 314 is mounted on the base 303, so that the moving grid 315 and the fixed grid 314 are concentrically opposed and maintain a small gap. In particular, in this embodiment, the gear 316 fixed on the rotating shaft 306 is meshed with the gear 312 on the lever 304, as shown in FIG. 3B. In this way, the movement of the probe of the lever 301 can drive the grid 315 to rotate. By adopting gear transmission in the present invention, the non-linear error can be smaller, and the indexing radius R of the gear on the rotating shaft 306 can be made smaller, which is conducive to improving the resolution of the lever meter, as shown in FIG. 3C. In addition, if the present invention changes the electrical connection between the digital display screen 313 and the fixed grid plate 314 with a measurement circuit to a flexible connection, for example, a flexible printed circuit or a thermocompression connector, the plastic case 310 and the fixed grid plate 314 are fixed on the base. On 303, the digital display screen 313 is hingedly mounted on the plastic case 310, so that the digital display screen 313 can be flipped relative to the base 303 to adjust the viewing angle.

The digital display lever meter 40 of the third preferred embodiment of the present invention is shown in FIG. 4A. According to the lever meter 40 of this embodiment, the digital display screen 418 can be rotated within a range of 360 relative to the base 407 so as to observe the readings from different directions. In the lever system of the lever meter 40, a measuring lever 401 and a fork lever 406 are installed on both sides of the lever rotating shaft 405, respectively. A pair of ball bearings 403 is embedded in the rotating shaft 405, and the bearings 403 rotate around a tapered shaft tip 404 mounted on the base 407. The shaft tip 404 is mounted on the base 407 by using a thread, and the installation depth can be adjusted to the shaft tip. No clearance fit with ball bearings to ensure that the axis of rotation of the lever A-A is fixed relative to the base. The measuring lever 401 and the lever rotating shaft 405 are connected by a screw thread, and there is an adjustable length sleeve ⁴ ⁰² in the middle interval. It is used to fine-tune the distance from the central axis of the transmission to the touch point of the probe, that is, the length of Lo. Guaranteed accuracy.

Even better, the upper and lower ends of the moving grid turntable 412 of the sensor 40 each have a tapered shaft The tip 421 cooperates with the ball bearings 410 and 413 without clearance, respectively, so that the rotation axis line B-B of the turntable 412 is constant during the rotation process, and is parallel to the lever rotation axis A-A line. In particular, the bearing 413 is embedded in the fixed grid plate 420, and the center of the bearing 413 coincides with the fixed grid pattern center. The bearing 410 is fixed on the base 407 through a screw and a fastening nut 411, and is adjusted by adjusting the depth of screw insertion. The bearings 410, 413 and the shaft tip of the turntable 412 are fitted without clearance. At the same time, the moving grid 419 is installed on the turntable 412 so that the moving grid surface is perpendicular to the axis B-B line, and the center of the figure of the moving grid is on the B-B line. In addition to the fixed grid, a printed circuit board 420 is also fabricated with a measurement circuit, and components such as an integrated circuit (IC), a crystal oscillator, and a capacitor are mounted.

Fixed grid plate with measuring circuit 420 digital display screen 4 1 8 is electrically connected by conductive rubber strips and fixed on plastic case 4 1 7 together. More specifically, the plastic case 417 is mounted on a circular ring-shaped bracket 408, which is adapted to the base 407 and can be rotated relative to the base 407. Refer to the schematic diagram of the lever table 40 shown in FIG. 4C. The center axis of rotation of the bracket 408 is perpendicular to the fixed grid surface and passes through the center of the figure of the fixed grid and coincides with the line B-B of the center axis of the moving grid circle turntable 414.

There is a small gap between the moving grid and the fixed grid facing each other to form a grid-capacitive angular displacement sensor. There is a lever 409 on the turntable 412. By coupling the lever 409 and the fork 406, the sensor can monitor the displacement of the lever 401 and the probe 422.

The mechanical zero reset system of the lever meter 40 is composed of a spring 414, two zero-position levers 415, and a shift post 416. At the zero position, the cross spring is clamped on the four-round post 416, and it is also pressed against the two gear levers 415 at the same time. The gear lever balances the restoring force of the spring and maintains the zero position, as shown in FIG. 4B. When the turntable 414 is turned in any direction, the plunger deviates from the zero position. One end of the spring 414 leaves the plunger 416, and the other end is away from the gear lever 415, and a resetting force is generated.

The internal structure of the lever meter 50 according to the fourth preferred embodiment of the present invention is shown in FIG. 5A. The digital display screen 517 in this embodiment is perpendicular to the rotation plane of the lever, as shown in FIG. 5D. The lever system is composed of a rotating shaft 505 and a probe lever 501 and a fork lever 506 installed on both sides of the rotating shaft 505. The rotating shaft 505 has a pair of tapered shaft tips and a pair of ball bearings 504. The bearings 504 are fastened to the base 507 with threads and fastening nuts 503. The screwing depth adjustment of the screw installation can make the shaft tips and The ball bearing realizes a clearance-free fit to ensure that the position of the rotation axis A-A line relative to the base 507 does not change when the shaft 505 rotates. The probe lever 501 is also mounted on the rotating shaft 505 with a thread, and an adjustable-length sleeve 502 is sleeved on the mounting thread of the 501 to finely adjust the distance Lo.

One end of the shaft 513 is provided with an umbrella cap 523, and the other end is fixed to a support frame 509 through a thread, and the support frame 509 is mounted on the base 507 so that the axis line B-B is parallel to the axis line A-A. In particular, the upper and lower surfaces of the center hole portion of the moving grid turntable 512 of the sensor 50 are recessed to form recessed portions 521 and 522. The recessed part 521 and the umbrella cap 523 are fitted into balls to become a pair of ball bearings; the recessed part 522 is fitted to the support frame 509 and fitted with balls to form a ball bearing, so the turntable 512 can rotate around the shaft 513. By adjusting the screw-in depth, the ball bearing and the shaft can achieve a clearance-free fit, so that when the turntable 512 rotates, the rotation axis B-B line is fixed to the support frame 509. The moving grid 519 is installed on the turntable 512, and the vertical grid line B-B is installed on the moving grid surface. The graphic center of the moving grid 519 is on the B-B axis. The fixed grid 520 is fixed on the shaft 513, and the axis B-B is vertical. It is located at the fixed grid 520 and passes through the center of the figure of the fixed grid. This ensures that the moving grid and the fixed grid are parallel and concentric, and then a small gap maintained face to face becomes a capacitive grid sensor.

There is a lever 508 on the turntable 512. Through the coupling of the lever 508 and the fork lever 506, the displacement of the probe of the lever 501 will be transmitted to the moving grid 519 of the sensor 500 and detected.

The mechanical zero return system of the lever meter 50 is formed by a zero return spring 514 mounted on a support frame 509, two eccentric stops 515 mounted on the base 507, and a lever 508 on the turntable 512, as shown in FIG. 5B. As shown, the lever 508 here is driven by both the fork and the spring. The eccentric baffle 515 is mounted on the base 507 with threads, and the mounting position of the eccentric blob 515 can be changed, for example, by rotating the thread. In the zero position, the cross spring 514 sandwiched between the levers 508 can be aligned with the two baffles 515. Cut to eliminate the mechanical zero position variation to ensure the accurate zero position of the lever meter. Components such as switches and batteries are installed on the third printed circuit board 518. Components such as integrated circuits (IC) and crystal capacitors can be mounted on the board 518 or on the fixed grid 520. The third printed circuit board 518 and the digital display screen 517 are electrically connected with a conductive adhesive strip and are fixed on a plastic case 516 to become a display module. As shown in FIG. 5C, the module is mounted on the base 507 to make 517 Display It is perpendicular to the rotation surface of the lever, so that the fixed grid 520 and the printed circuit board 518 have an angle of 90 °. The electrical connection methods of the fixed grids 520 and 518 can be flexible connections using flexible cables, flexible printed circuits or thermocompression connectors (zebra paper).

FIG. 6A is a schematic diagram of the overall structure of a capacitive grid-type digital display lever meter 60 according to a fifth embodiment of the present invention, in which a digital display screen 619 is tilted in a housing 616, that is, the digital display screen 619 has an included angle with respect to the rotation plane of the lever; In addition, according to the lever table 60 of this embodiment, the display screen 619 can be rotated within 360 ° relative to the base, so that the display screen can be adjusted to the optimal viewing angle when viewed from different directions.

Referring to FIG. 6A, the support frame 609 is provided with recessed portions 622 and 623 around its screw holes at two end surfaces, respectively. The shaft member 613 includes a first umbrella cap 624, which is disposed at the top portion and is fixed to the fixed grid plate 621; and a second umbrella cap 611, which is connected to the bottom end portion of the base plate through a screw hole, and is placed on the base. In the groove. The moving grid turntable 612 includes an upper recessed portion 625 on two end surfaces, which surrounds its central hole portion and is disposed on the upper end of the turntable 612. The upper recessed portion 625 cooperates with the first umbrella cap 624 of the shaft 613 for receiving. A plurality of balls; and a lower recessed portion 626 surrounding the central hole portion and disposed at the lower end of the turntable 612, the lower recessed portion 626 cooperates with the upper recessed portion 625 of the support frame 609 to receive a plurality of balls. Therefore, the combination of the upper and lower end balls of the turntable 612 can rotate relative to the rotation shaft 613; the rotation shaft 613 can rotate relative to the support frame 609 with the cooperation of the balls provided on the upper and lower end surfaces of the support frame 609. Of course, adjusting the screw-in depth of the umbrella cap 61 1 can make all of the ball bearings distributed in the axial direction fit without clearance, and ensure that the rotation center axis of the turntable 612 relative to the base 609 and the rotation center axis of the rotation shaft 613 relative to the base are The same line B-B line is parallel to the axis A-A line. According to this embodiment of the present invention, the fixed grid 621 is fixed on the rotating shaft 613, and is opposed to the moving grid plate 620 fixed on the turntable 612 with a certain gap, and the rotation center axis B-B line passes through the The center of the figure of the moving grid 620 and the fixed grid 62 1 forms a capacitive grid angular displacement sensor.

At the same time, the fixed grid 621 is fixed to the casing 616 for fixing the display screen 619. Since the rotating shaft 613 can rotate relative to the supporting frame 609 with the help of balls provided on the upper and lower end surfaces of the supporting frame 609, the fixed grid 62 1 of the sensor 600 fixed to the rotating shaft 613 Can be rotated 360 °. In this way, according to the lever meter 60 of the present invention, its housing 6 1 6 can rotate relative to the base 609, as shown in FIG. 6C. The rotation of the fixed grid 62 1 only changes the mechanical zero position of the sensor, and does not change any other characteristic parameters of the sensor.

In addition, the transmission between the lever system and the angular displacement sensor is realized by coupling the fork on the fork lever 606 and the lever 608 on the turntable 612. The zero return system of this embodiment is basically the same as the fourth embodiment. As shown in FIG. 6B, it is composed of a zero return spring 614, a shift lever 608, and two eccentric stops 615. In addition to the fixed grid, the fixed grid plate 621 is also manufactured with a measurement circuit, and can be equipped with components such as integrated circuits (ICs), crystals, capacitors and the like. The fixed grid plate 621 and the digital display screen 619 are electrically connected by a conductive tape with an inclined surface, and the two are fixed at a certain angle and fixed in a plastic case 616 to become a measurement display module.

The lever table 60 of the present invention is provided with a rubber bowl 618 of the lever table 60 of the present invention on the head of the base 607. More specifically, the lever meter 60 of the present invention is also provided with a sealing rubber ring 617 around the cavity on the base 607 for sealing the plastic case 616. In this way, the measurement display module provided in the housing 616 can not only rotate 360 ° relative to the base 607, but also because the housing itself is sealed, it can still prevent oil, water and dust when the housing 616 rotates or the lever 601 moves. Enter the inside of the lever meter 60 to ensure that the capacitive grid sensor composed of the fixed grid plate 621 and the moving grid 620 can reliably work in the environment with oil, water, dust and other pollutants.

FIG. 7A is a schematic diagram of the overall structure of a capacitive grid-type digital display lever meter 70 according to a sixth preferred embodiment of the present invention, in which the digital display screen 722 is disposed perpendicular to the rotation surface of the lever system, as shown in FIG. 7C. The lever system of the lever meter 70 of the present invention is basically the same as that of the fourth embodiment, that is, the fork on the fork lever 706 and the lever 708 on the turntable 712 are coupled to rotate, so that the movement of the measuring lever contact drives the grid. The turntable 712 rotates. At the same time, the structure of the angular displacement sensor is basically the same as that of the fourth embodiment, that is, the lower end of the umbrella shaft 713 is mounted on the support frame 709 by threads; the upper and lower sides of the turntable 712 have depressions, and the ball and the umbrella shaft 713 and The supporting frame 709 cooperates. The nut 711 plays a role of fastening and adjustment, so that the ball and the disc 712 and the shaft 713 cooperate with each other without a gap, so that the rotation center axis B-B of the turntable 712 is constant with respect to the base 707. The support frame 709 is fixed to the base 707 by screws 710 so as to be parallel to the line A-A of the center axis of rotation of the lever. The moving grid 720 and the fixed grid 719 face each other with a small gap of about 0.1mm and make the rotation center axis line B-B perpendicular to the surfaces of the moving grid 720 and the fixed grid 719 and pass through the center of the moving grid and the fixed grid. Capacitive grid angular displacement sensor. The mechanical zero return system of the lever meter 70 is shown in FIG. 7B. It consists of a zero return spring 714, a lever 708, and two stops 715. In particular, the stopper 715 is directly mounted on the support frame 709, and the stopper 715 can be rotated and adjusted around the center hole C, so that the round end of the front end of the stopper just contacts the spring 714 at the zero position. At (:, D, two holes, the stopper 715 is fastened to the support frame 709, and one end of the spring 714 is clamped to the support frame 709 with a pressure block 717. The zero return system can be adjusted outside the base 707, and then The sensor and the zero return system on the support frame 709 are integrated into the base 707, which is convenient for installation and adjustment. The fixed grid plate 719 of this embodiment has a measuring circuit and is equipped with components such as integrated circuits (ICs), crystal oscillators, capacitors, etc. The fixed grid plate 719 is fixed on the shaft 713. The printed circuit board 721 is mounted on the plastic case 716, and is equipped with components such as switches, batteries, and the like, and the digital display screen fixed on the housing 716 can be connected with the conductive rubber strip. 722 is electrically connected. The electrical connection between the fixed grid plate 719 and the printed wiring board 721 which are perpendicular to each other is by direct soldering at a 90 ° angle. Part of the area of the fixed grid plate 719 and the movable grid plate 720 is inserted into the circuit board 721. Inside the slot to reduce the overall lever meter Height, so that the effective area of the fixed grid and moving grid is not reduced to maintain the sensitivity of the sensor. The cover plate 718 is installed on the base 707, and the blind holes on the cover plate 718 are embedded in the umbrella cap of the shaft 713, so that the two ends of the shaft 713 are fixed It is not easy to shake, and at the same time, the cover plate 718 plays a role of protecting the capacity sensor.

FIG. 8A is a schematic diagram of the overall structure of a seventh embodiment of a capacitive grid digital display lever meter according to the present invention, in which a driven gear 810 meshing with a lever gear 806 is disposed on a rotating shaft 813, and a schematic diagram thereof is shown in FIG. 8B The digital display screen 822 is also perpendicular to the rotation plane of the lever, as shown in FIG. 8D. The turntable 812 is fixed on the rotating shaft 81 3 with a screw and rotates together. A pair of tapered ball bearing holders are made on the rotating shaft 81 3 and the supporting frame 809. The turntable 81 2 is screwed onto the rotating shaft 813 so that the ball bearings can be fitted without clearance, so that the center line B-B of the rotation is relative to the supporting frame 809 during rotation. Keep it constant. Support frame 809 by screws Fasten to the base 807 so that the B-B axis is parallel to the A-A axis. The moving grid 820 is fixed on the turntable 812, and the B-B axis is perpendicular to the moving grid 820 and passes through the center of the figure of the moving grid. The fixed grid plate 819 is fixed on the cover plate 818, and the cover plate 818 is fixed on the base 807, so that the fixed grid and the moving grid face to face maintain a small gap and the axis B-B passes through the fixed grid perpendicular to the fixed grid surface. The center of the graph is then formed into a capacitive grid angular displacement sensor. The zero return system of the lever meter is the same as that of the sixth embodiment, and is composed of a spring 814 pressed on the bracket 809 by a pressing block 817, a lever 808 on the turntable 812, and two adjustable stops 815 mounted on the support frame 809 It is only that the shift lever 808 now only shifts the spring 814 and is no longer used as a transmission member coupled to the lever, as shown in FIG. 8C. The printed circuit board 821 and the digital display screen 822 are electrically connected with a conductive adhesive strip and fixed on a plastic case 816 to become a display module. The mold is fixed on the base 807. A slot is formed on the printed circuit board 821, so that a part of the area of the turntable 812 and the moving grid 820 can enter the slot for rotation, and a part of the fixed grid plate 819 is also inserted into the slot. The electrical connections of the circuit boards 821 and 819 that are perpendicular to each other are directly soldered by using a 90 ° corner, and the lifting gate is installed on the fixed grid 819. Components such as batteries, integrated circuits (ICs), crystals, capacitors can be mounted on the fixed grid plate 819 or on the circuit board 821.

FIG. 9A is a schematic diagram of the overall structure of a capacitive grid digital display lever meter 90 according to an eighth embodiment of the present invention, in which a housing 916 for fixing a digital display screen 925 is disposed at a rear portion of a base 907 by a rotating shaft 920, The display screen 925 is approximately perpendicular to the probe lever 901. In some applications, for example, to go deep into the hole to measure, this crusted lever meter is more convenient to read. In this embodiment, a flexible cable 919 for electrical connection between the circuit board 924 and the fixed grid plate 922 is used. The housing 916 is fixed on the board 921, and the board 921 can be rotated relative to the base 907 with the shaft 920 as a rotating shaft. The flexible cable allows a rotation range of 270 °, and the display screen 925 can be easily viewed from various directions.

The present invention can make full use of the existing digital display measuring instrument IC and apply it to the measuring circuit of the digital display lever meter of the present invention, so that the production and development cost of the digital display lever meter of the present invention can be effectively reduced. Therefore, if the IC of the existing digital display measuring instrument is used, the structure of each part of the digital display lever table of the present invention should satisfy the following relationship:

ω R Lo / Li = c formula (l)

Among them, ω represents the radian of the sector angle of each transmitting electrode, and R represents the rotation of the moving grid turntable The distance from the center to the contact point of the transmission coupling of the transmission lever and the sensor, Lo is the distance from the center of the rotation of the lever to the contact point of the measuring head on the measurement lever, and Li is the distance from the center of the rotation of the lever to the contact point of the transmission lever and the sensor, C represents a constant.

If the IC is an inch-length IC, for a leverage meter with a resolution of 0.01mm or 0.001mm, it should meet:

2 7T RLo / 8NLi = 0.635mm formula (2)

Or,

27r RLo / 8NLi = 0.0635mm formula (3)

Among them, R is the distance from the rotation center of the moving grid to the contact point of the transmission coupling between the transmission lever and the angular displacement sensor, Lo is the distance from the rotation center of the lever to the contact point of the measuring head on the measurement lever, and Li is the rotation center of the lever to the transmission lever and angle. The distance of the transmission coupling contact point of the displacement sensor. For a fork drive, R is the distance from the center of the turntable to the center of the lever, and Li is the distance from the center of the lever's rotation to the contact point of the lever fork and the lever; for gear meshing transmission, R is the index of the driven gear on the sensor Circle radius, Li is the indexing circle radius of the driving gear on the transmission lever.

If the metric length IC is used as the calculation processing circuit of the digital display lever meter, for a lever meter with a resolution of 0.01mm or 0.001mm, it should meet:

or,

Among them, R is the distance from the rotation center of the moving grid to the contact point of the transmission coupling between the transmission lever and the angular displacement sensor, Lo is the distance from the rotation center of the lever to the contact point of the measuring head on the measurement lever, and Li is the rotation center of the lever to the transmission lever and angle. The distance of the transmission coupling contact point of the displacement sensor. For the fork drive, R is the distance from the center of the turntable to the center of the lever, and Li is the distance from the center of the lever to the contact between the lever fork and the lever. For gear meshing transmission, R is the component of the driven gear on the sensor. The circle radius, Li is the circle radius of the driving gear on the transmission lever. In addition to the calculation processing circuit of the digital display lever meter of the present invention, in addition to the existing metric or inch length measurement dedicated digital display IC, it can also directly use the angle measurement dedicated digital display IC. When measuring angle dedicated digital display IC with percentage Θ. Is the basic unit. For a lever table with a resolution of 0.01 mm or 0.001 mm, the relationship between the results should meet:

2 RG ₀ WLi 360 ⁰ = 0. 01mm Formula 6

or,

Formula seven

Among them, R is the distance from the center of the moving grid to the contact point of the transmission coupling between the transmission lever and the angular displacement sensor, Lo is the distance from the rotation center of the lever to the contact point of the measuring head on the measurement lever, and Li is the distance from the rotation center of the lever to the transmission lever and angle. The distance of the transmission coupling contact point of the displacement sensor. For the fork drive, R is the distance from the center of the turntable to the center of the lever, and Li is the distance from the center of the lever to the contact between the lever fork and the lever. For gear meshing transmission, R is the component of the driven gear on the sensor. Degree El radius, Li is the indexing circle radius of the driving gear on the transmission lever.

When measuring angle dedicated IC in radians φ. Is the basic unit. For a lever table with a resolution of 0.01 mm or 0.001 mm, the structural relationship should meet:

R φ. L. / Lj = 0 .01mm Formula 8

Or,

R φ ₀ L ₀ /

. 001mm formula 9

Among them, R is the distance from the center of the moving grid to the contact point of the transmission coupling between the transmission lever and the angular displacement sensor, Lo is the distance from the rotation center of the lever to the contact point of the measuring head on the measurement lever, and Li is the distance from the rotation center of the lever to the transmission lever and angle. The distance of the transmission coupling contact point of the displacement sensor. For the fork drive, R is the distance from the center of the turntable to the center of the pull rod, and Li is the distance from the center of the lever to the contact between the lever fork and the lever. For gear meshing transmission, R is the component of the driven gear on the sensor. The circle radius, Li is the circle radius of the driving gear on the transmission lever.

The digital display lever meter of the present invention can use the existing special digital display in length and angle measurement. Obviously, this can reduce the cost of developing and designing the IC circuit; of course, the present invention can also design and make a dedicated digital display IC for the lever meter.

Although the present invention specifically describes the technical solution of the present invention through the foregoing preferred embodiments, those skilled in the art can make changes and modifications based on the technical solution of the present invention, and they will all belong to the appended claims of the present invention. The required scope of protection. Industrial applicability

The digital display lever meter of the present invention is simpler in mechanical structure and circuit, higher in stability and longer in life than the existing digital display lever meter;

The measurement display module of the present invention can be installed at any position on its seat, can be rotated around any set axis to adjust the observation orientation, and can be turned in any set direction to adjust the viewing angle. In this way, the present invention facilitates reading by observers of various positions, and increases the practicability of the digital display lever meter of the present invention. The digital display lever meter of the present invention selects an appropriate leverage ratio Li / L. With the transmission ratio R / Li, you can directly use the application specific integrated circuit (IC) of a digital display measuring tool as the measuring circuit IC of the lever meter, which can save the cost of developing a new IC, and effectively reduce the production and development costs. For industrial applications.

Claims

0067 Fork profit requirement

1. A grid-type digital display lever meter, including

A leverage system, including

A rotating central shaft, the ends of which are respectively fixed to a base with bearings;

A first lever provided on the outside of the base, one end of which has a measuring contact, and the other end of which is fixed to the rotation central axis; and

A second lever, which is disposed in the cavity of the base and is fixed to the rotation central shaft by one end portion, and has a transmission member on the other end portion;

A zero return system is provided in the cavity of the base to reset the lever system, and a sensor is coupled to the transmission member of the second lever to monitor displacement from the lever system ; as well as,

A digital display unit, which is arranged on the base by using a housing, and includes:

A digital display screen; and

A measurement circuit board, characterized in that the sensor disposed in the cavity includes a rotating device provided with

A shaft member connected to the base; and

A connecting member coupled with the transmission member;

A moving grid as an induction electrode is linked with the connecting member and is coaxially arranged with the shaft member through a rotating turntable; and,

A fixed grid including a transmitting electrode and a receiving electrode is concentrically opposed to the moving grid at a fixed distance.

2. According to the leverage table as described in claim 1,

It is characterized in that the fixed grid is arranged on the measurement circuit board and is fixed to the base with the circuit board.

3. According to the leverage table according to the profit requirement 1,

It is characterized in that the digital display screen is arranged outside the casing by a pivot for flipping relative to the casing.

4. According to the leverage table as described in claim 1,

It is characterized in that the lever meter further comprises a ring-shaped bracket rotatable relative to the base, having a wall portion matched with the cavity; and a base portion matched with the base.

5. According to the leverage table as described in claim 4,

It is characterized in that the circuit board provided with the fixed grid is fixed on the annular support, and a bearing is provided, which is located at the center of the figure of the fixed grid.

6. According to the leverage table as described in claim 5,

It is characterized in that the shaft member of the sensor includes

A first shaft tip provided at one end of the rotating shaft to cooperate with the bearing provided on the annular bracket; and

The second shaft tip is disposed at the other end of the rotating shaft and cooperates with a bearing fixed on the base.

7. According to the leverage table as described in claim 6,

It is characterized in that the bearing matched with the second shaft tip is arranged in a nut passing through the base.

8. According to the leverage table as described in claim 1,

It is characterized in that the rotating device further comprises a support frame provided in the cavity, and is fixed to the base with a fastener.

9. According to the leverage table as described in claim 8,

It is characterized in that the shaft member is fixed to the support frame by one end and includes:

An umbrella cap is arranged at the other end and is fixed to the fixed grid plate.

10. According to the leverage table according to claim 9,

It is characterized in that the moving grid turntable includes

A first recessed portion surrounding the central hole portion and disposed at an upper end of the turntable, the first recessed portion cooperating with the umbrella cap for receiving a plurality of balls; and

A second recessed portion is provided around the central hole portion and is disposed at the lower end of the turntable. The second recessed portion cooperates with the support frame for receiving a plurality of balls.

11. According to the lever table described in the claim 1,

It is characterized in that the housing of the digital display unit is arranged parallel to the rotation surface of the lever system.

12. According to the leverage table as described in claim 8,

It is characterized in that the support frame contains

A first recessed portion that surrounds its screw hole and is disposed on the upper portion; and

The second recessed portion surrounds the screw hole and is disposed at the lower portion.

13. According to the leverage table according to claim 12,

It is characterized in that the shaft includes

A first umbrella cap, which is disposed at one end and is fixed to the fixed grid plate;

A second umbrella cap is disposed at the other end and is placed in the groove phase of the base. The second umbrella cap cooperates with the second recessed portion of the support frame for receiving Thousands of balls.

14. According to the leverage table according to claim 13,

It is characterized in that the moving grid turntable includes

A first recessed portion surrounding the central hole portion thereof and disposed at an upper end of the turntable, the first recessed portion cooperated with the first umbrella cap of the support base for receiving Ruoqiang balls; and

A second recessed portion is provided around the central hole portion and is disposed at the lower end of the turntable. The second recessed portion cooperates with the first recessed portion of the support frame for receiving Ruoqian balls.

15. According to the leverage table according to claim 14,

It is characterized in that the fixed grid is connected to a casing of the display unit.

16. According to the leverage table according to claim 15,

It is characterized in that the lever meter is provided with a seal ring between the cavity of the base and the housing for fixing the display screen.

17. According to the leverage table as described in claim 1,

It is characterized in that the display screen is arranged obliquely in the casing.

18. According to the leverage table as described in claim 1,

It is characterized in that the housing of the digital display unit is arranged perpendicular to the rotation surface of the lever system.

19. According to the leverage table as described in claim 1,

It is characterized in that the digital display screen is disposed at an end of the base.

20. According to the leverage table according to claim 19,

It is characterized in that the housing is fixed to the end of the base by a rotating shaft and is perpendicular to the rotation surface of the lever.

21. According to the leverage table according to claim 1,

It is characterized in that at least one end portion of the rotation central shaft is disposed in a fine adjustment nut disposed through the base.

22. According to the leverage table according to the claim 1,

It is characterized in that the fixed grid includes a circular receiving electrode and a Ruoqian transmitting electrode, and the number of the transmitting electrodes is 8 times the number of the sensing electrodes provided on the moving grid.

23. According to the leverage table as described in claim 1,

It is characterized in that the leverage table satisfies the following relationship

Among them, ω represents the radian of the sector angle of each transmitting electrode, R represents the distance from the center of rotation of the moving grid turntable to the contact point of the transmission coupling between the transmission lever and the sensor, and L ο is the contact point of the rotation center of the lever to the measurement head on the measurement lever The distance Li is the distance from the center of rotation of the lever to the coupling contact point between the transmission lever and the sensor, and C represents a constant.

24. According to the leverage table as described in claim 1,

It is characterized in that the axis of the rotation device is parallel to the axis of rotation of the lever.

25. According to the leverage table as described in claim 1,

It is characterized in that the transmission member is provided as a gear; the connecting member of the rotating device is a gear which is concentrically mounted with the shaft member.

26. According to the leverage table according to claim 25,

It is characterized in that, in the lever meter, an outer edge of the moving grid turntable is provided as a tooth portion as a transmission member connected to the transmission member.

27. According to the leverage table according to claim 1, It is characterized in that the transmission member is provided as a shift fork; the connecting member of the rotating device is a rod member and is disposed on the shaft member.

28. According to the leverage table as described in claim 1,

It is characterized in that the transmission member is provided as a shift fork, and the connecting member of the rotating device is a lever member provided on the movable grid turntable.