WO2021026960A1 - Bande de mesure numérique, dispositif de codage pour bande de mesure numérique et procédé de mesure correspondant - Google Patents

Bande de mesure numérique, dispositif de codage pour bande de mesure numérique et procédé de mesure correspondant Download PDF

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Publication number
WO2021026960A1
WO2021026960A1 PCT/CN2019/102099 CN2019102099W WO2021026960A1 WO 2021026960 A1 WO2021026960 A1 WO 2021026960A1 CN 2019102099 W CN2019102099 W CN 2019102099W WO 2021026960 A1 WO2021026960 A1 WO 2021026960A1
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code
center
metal
metal contacts
group
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PCT/CN2019/102099
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English (en)
Chinese (zh)
Inventor
胡文亮
彭圣
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珠海市易迅科技有限公司
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Publication of WO2021026960A1 publication Critical patent/WO2021026960A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B3/00—Measuring instruments characterised by the use of mechanical techniques
    • G01B3/10—Measuring tapes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means

Definitions

  • the invention relates to the field of digital measurement, in particular to a digital measuring tape, an encoding device for the digital measuring tape, and a corresponding measuring method.
  • a tape measure is a tool for measuring length often used in daily life. Because it is soft and can be rolled up, it is also a tape measure.
  • a digital measuring tape has appeared in recent years. Through a certain digital method, the rotation of the code wheel is converted into the length of the measured object and displayed on the LCD screen.
  • some existing digital tape measures are convenient for reading, they have the problem of insufficient measurement accuracy. Such tape measures are not suitable for applications requiring high measurement accuracy. Therefore, it is necessary to design a digital measuring tape that can facilitate reading and improve measurement accuracy to meet the requirements of high measurement accuracy.
  • the application number is 201611240444.8, a Chinese invention patent entitled “Smart tape measure and its measuring method", discloses a smart tape measure and its measuring method.
  • a counting roller is set at the exit of the tape measure. When the tape measure is pulled out, the roller rotates. The number of laps and the circumference of the roller can be calculated and displayed on the display screen.
  • a counting roller is also set in the lower part of the tape measure box to facilitate measuring the length of the concave surface.
  • the data When the data is confirmed, it will be automatically uploaded to the mobile terminal through the wireless network. After processing on the mobile terminal, it is automatically uploaded to the cloud and saved.
  • it requires two counting rollers, and the structure is more complicated.
  • the present invention provides a digital tape measure, an encoding device for the digital tape measure, and a corresponding measurement method.
  • an encoding device for digital tape measure including:
  • Code disc said code disc is circular and has a central through hole
  • a roller matched with the code wheel the center of the roller wheel has a rotating shaft matched with the central through hole, so that the roller can be fixed above the code wheel, contact with the code wheel and relative to the code wheel Disk rotation;
  • a metal elastic member fixed on the roller A metal elastic member fixed on the roller;
  • each of the plurality of sets of metal contacts includes one or more metal contacts
  • the metal elastic member is distributed in the 1/4 circle of the roller, and includes the same number as the number of the groups of the plurality of metal contact pieces, and the metal contact pieces are matched with each other and spaced apart from each other.
  • One or more strip-shaped metal elastic contact bodies so that when the roller rotates relative to the code wheel, it can contact only one metal contact piece in the same group of the multiple sets of metal contact pieces at the same time.
  • the contact relationship between the metal elastic contact body in the metal elastic member and the multiple sets of metal contacts is unique.
  • the radial distance from the center of each of the metal contacts belonging to the same group to the center of the code wheel is equal, and belongs to different The radial distances from the centers of any two metal contact pieces in the group to the center of the code wheel are not equal.
  • each of the metal contacts is a circular ring segment with a certain radial width, which has a first arc surface and a second arc surface in the radial direction, wherein, The distance from the first arc surface to the center of the code wheel is smaller than the distance from the second arc surface to the center of the circle.
  • each of the metal contacts belonging to the same group is evenly distributed in the circumferential direction of a circle formed at the same radial distance, so that they belong to The center angle formed by the center of two adjacent contact members in the same group and the center of the code wheel is equal.
  • the number of the groups of the plurality of metal contacts is 4 groups.
  • the through hole closest to the center of the code disc, and the first arc surface of the first group of metal connection components is at the center of the code disc.
  • the central angle of the composition is 26°; the second group of metal contacts is close to the first group of metal contacts and farther away from the center of the code wheel, and the first arc of the first group of metal contacts is The center angle formed by the center of the code wheel is 30°; the third group of metal contacts is close to the second group of metal contacts and farther away from the center of the code disk, and the first group of metal contacts
  • the central angle formed by the first arc of the piece and the center of the code wheel is 13°; the fourth group of metal contacts is close to the third group of metal contacts and farther away from the center of the code wheel, and The central angle formed by the first arc surface of the fourth group of metal contacts and the center of the code wheel is 6°.
  • the diameters of the code wheel and the roller are both ⁇ 41, the diameter of the central through hole of the code disk is ⁇ 10; the diameter of the rotating shaft of the roller is ⁇ 10.6.
  • the present invention provides a digital measuring tape including the encoding device as described above, and further includes a processor, a decoding device, a communication device, and a display device; wherein,
  • the processor is connected to the encoding device, the decoding device, the communication device and the display device of the digital tape measure, and is used to send control instructions to the above-mentioned device and perform displacement calculation;
  • the decoding device is connected to the processor and the encoding device, and is used to decode the code generated by the encoding device;
  • the communication device is connected to the processor, and is used to send the displacement calculated by the processor;
  • the display device is connected to the processor and is used for displaying the displacement calculated by the processor.
  • the present invention proposes a method for measuring displacement using the above-mentioned digital tape measure, which includes the following steps:
  • the metal elastic contact body is respectively the code group formed by the metal contact or not contacting;
  • the present invention proposes a computer-readable storage medium on which a computer program is stored, and when the computer program is executed by a processor, the steps of the above method are realized.
  • the beneficial result of the present invention is that a simple encoding device can be provided, and the accuracy that can be provided is the tenth of a centimeter, that is, 0.1 centimeter.
  • Figure 1 shows a code wheel of a digital measuring tape according to the present invention
  • Figure 2 shows a roller of a digital tape measure according to the present invention
  • Fig. 3 is a schematic diagram showing the cooperation of the code disc and the roller of a digital measuring tape according to the present invention
  • Figure 4 shows a system frame diagram of a digital tape measure according to the present invention
  • Figure 5 shows a working schematic diagram of a digital tape measure according to the present invention
  • Fig. 6 shows a flow chart of a digital tape measuring method according to the present invention.
  • first, second, third, etc. may be used in this application to describe various elements, these elements should not be limited to these terms. These terms are only used to distinguish elements of the same type from each other.
  • first element may also be referred to as the second element, and similarly, the second element may also be referred to as the first element.
  • word "if” as used herein can be interpreted as "when” or "when”.
  • the method steps may be executed in another order.
  • the present invention is not limited to the sequence determined by the described method steps.
  • the present invention provides an encoding device for a digital measuring tape, including: a code wheel, the code wheel is circular and has a central through hole; a roller matched with the code wheel, the The center of the roller has a rotating shaft matched with the central through hole, so that the roller can be fixed above the code disc, contact with the code disc and rotate relative to the code disc; and fixed on the roller A metal elastic member; on one side of the code wheel, a plurality of sets of metal contacts protruding from the side are staggered along the radial direction of the one side, and the plurality of sets of metal contacts are not completely covered The one side surface of the code wheel; wherein each of the multiple sets of metal contacts includes one or more metal contacts; the metal elastic members are distributed in a 1/4 circle of the roller, And it includes one or more strip-shaped metal elastic contact bodies that
  • the metal elastic member is a spring leaf, as shown in FIG. 2.
  • the structure composed of the code disc and the spring of the roller is used for level detection.
  • the signal detection pin and the signal trigger pin have the same level, so there will be periodicity after the roller rotates once.
  • the level of signal can be judged according to the periodic signal change.
  • the radial distance from the center of each of the metal contacts belonging to the same group to the center of the code wheel is equal, and belongs to different groups.
  • the radial distances from the centers of any two metal contact pieces to the center of the code wheel are not equal. That is, the metal contacts with the same distance to the center of the code wheel belong to the same group.
  • each of the metal contacts is a circular ring segment with a certain radial width, which has a first arc surface and a second arc surface in the radial direction, wherein The distance from the first arc surface to the center of the code wheel is smaller than the distance from the second arc surface to the center of the code wheel. That is, just because the ring segment has a certain width in the radial direction, the ring segment defines two arc surfaces in the radial direction, and the first arc surface is closer to the code than the second arc surface. The center of the disc, the second arc is farther away from the center of the code disc than the first arc.
  • first and second expressions are only used to distinguish between different arcs, and do not limit the sequence.
  • first arc or the second arc can be closer The center of the code wheel.
  • each of the metal contacts belonging to the same group is evenly distributed in the circumferential direction of a circle formed at the same radial distance, so that they belong to the same group.
  • the center angle formed by the center of the two adjacent contact pieces in the group and the center of the code wheel is equal. It should be understood that the above arrangement is only a preferred embodiment of the present invention, and is not intended to limit the present invention. Under the premise of not departing from the spirit of the present invention, the two adjacent contact members in the same group The center may also be unequal to the central angle formed by the center of the code wheel.
  • the number of the groups of the multiple sets of metal contacts is 4 groups, which is the situation as shown in FIG. 1. It should be understood that the provision of 4 sets of metal contacts is only a preferred embodiment of the present invention. Under the premise of not violating the spirit of the present invention, more sets of metal contacts or fewer sets of metal contacts can be provided. It depends on the accuracy and the ease of processing.
  • the center through hole of the first group of metal contacts closest to the code wheel, and the first arc of the first group of metal contact components is at the center of the code wheel.
  • the central angle of the composition is 26°; the second group of metal contacts is close to the first group of metal contacts and farther away from the center of the code wheel, and the first arc of the first group of metal contacts is
  • the center angle formed by the center of the code wheel is 30°; the third group of metal contacts is close to the second group of metal contacts and farther away from the center of the code disk, and the first group of metal contacts
  • the central angle formed by the first arc of the piece and the center of the code wheel is 13°; the fourth group of metal contacts is close to the third group of metal contacts and farther away from the center of the code wheel, and
  • the central angle formed by the first arc surface of the fourth group of metal contacts and the center of the code wheel is 6°.
  • the diameters of the code wheel and the roller are both ⁇ 41, the diameter of the central through hole of the code disk is ⁇ 10; the diameter of the rotating shaft of the roller is ⁇ 10.6, It should be understood that such a setting method is only a preferred embodiment of the present invention, and other diameter sizes can be set without violating the spirit of the present invention, depending on factors such as the size and range of the measuring tape.
  • the processing The device is connected to the encoding device, the decoding device, the communication device and the display device of the digital tape measure, and is used to send control instructions to the above-mentioned device and perform displacement calculation;
  • the decoding device is connected to the processor and the encoding device, Is used to decode the code generated by the encoding device;
  • the communication device is connected to the processor and used to send the displacement calculated by the processor;
  • the display device is connected to the processor to display the The displacement calculated by the processor.
  • the structure of the code disc device is mainly composed of a rotation level detection sensor composed of a code disc circuit board, a roller and a spring fixed on the roller, which is pre-installed on the code disc circuit board. It is equipped with signal source and signal detection pins.
  • the measuring tape drives the roller to rotate during the pulling process, the spring plate on the roller will sweep across the copper plane of the code disc.
  • the signal detection pin corresponding to the place where the spring leaf passes will be short-circuited with the signal generation source, so that the signal returned by the detection pin to the main control CPU will generate the same signal as the signal generation source.
  • the main control CPU calculates the number of repetitions of these serial codes to determine the number of turns of the roller and the current serial code to determine the The angular displacement of the last rotation of the roller.
  • very precise dimensions can be obtained.
  • the accuracy of the tape gauge reading to the tenths of centimeters that is, 0.1 cm, can solve the error value caused by using the number of roller rotations and the circumference to convert the size.
  • the accuracy of reading the value on the master MCU depends on the accuracy of the exposed copper plane spacing on the code disc.
  • the figure shows the situation when the spring sheet sweeps the code disc at a detection moment, and each circle on the code disc represents a signal Detect the pin.
  • the roller rotates, the spring fixed on the roller is driven to rotate.
  • the 4 electrical signals generated by the place where the spring is swept will be transmitted to the processor at the same time, and at a certain moment, when the spring contacts When it reaches a certain metal contact of the code disc, it is indicated by the code "1".
  • the spring leaf does not touch a certain metal contact of the code disc, it is indicated by the code "0".
  • a 4-bit encoding signal will be generated, such as 1001 and 1110 in the figure.
  • the processor converts the received electrical signal into corresponding displacement information.
  • the physical quantity measured by the encoding device will be converted into an electrical signal based on these four pins, and the processor will calculate and process the electrical signal and then convert it into the digital quantity of the current measuring tape for display or transmission through the communication device.
  • the figure shows the signal source pins and the signal test pins of PA1, PA2, PA3, and PA4. Among them, the signal test pins of PA1, PA2, PA3, and PA4 correspond to a set of metal contacts, as shown in the figure.
  • PA1 is on the outermost circle
  • PA4 is on the innermost circle
  • the single-chip microcomputer presets PA0 to always output a square wave signal
  • PA1, PA2, PA3, and PA4 are used as signal input capture pins, when the spring is scanned on the code disc , If the spring leaf is in contact with one of the metal contacts, such as PA1 and the metal contact, the PA0 pin and PA1 pin will be short-circuited, thus generating a contact signal, if the spring leaf is not with any metal contact Contact, no short circuit occurs, no contact signal is generated.
  • the position of the spring leaf leaves four level signals (such as 1001) on the four test pins on the code wheel, and the measuring tape is pulled from 0 to 3 meters.
  • a series of serial codes from 1001 to 1110 can be measured from these four signal pins, and then the serial codes obtained from 1001 to 1110 after the tape is drawn are calculated how many times are repeated in total. Cycle string code.
  • the spring leaf will return to the point of 1001 when it rotates one circle and repeats again, and then it loops the last string code number again. According to this rule, 3000 serial codes are obtained, and a total of 50 laps are repeated. That is, 60 serial codes in a circle.
  • the preset signal serial code will be measured on these four pins every time the tape is pulled out 1 cm, that is, the one-to-one corresponding value can be obtained by looking up the table. According to this rule, we can Determine the size of the tape we pulled out.
  • the table form diagram is as follows:
  • the measuring tape proposed by the present invention can also be designed according to the required accuracy.
  • the required accuracy is centimeters
  • the measuring tape of the present invention When 1 cm is pulled out, only one changing signal string code is needed to correspond to it. In this way, we can find out the position of the tape after pulling it out by looking up the table.
  • the total length of the measuring tape is 3 meters, and the corresponding measuring tape rotates for a total of 50 cycles, and 60 signal strings are needed on the code disc (that is, the four signal pins are from 1001 to 1110 at the same time). Therefore, the code disc It is necessary to design correspondingly 60 sets of signal strings. Therefore, according to this signal set, a code disk with 60 sets of signal strings or 70 sets of signal strings can be designed.
  • the metal elastic contact body is respectively the metal contact and the generating The code group formed by contact or no contact
  • B According to the size of the code disc, the setting method of the metal contact, and the detection time interval, the corresponding angular displacement corresponding to two adjacent codes in the code group is obtained Relationship
  • C Determine the displacement based on the above-mentioned corresponding relationship and the number of codes in the received code group.
  • the above-mentioned step C can also calculate the displacement according to the law of period as discussed above.
  • a computer-readable storage medium on which a computer program is stored, characterized in that the computer program is executed by a processor to implement the steps of the above method.
  • the embodiments of the present invention can be realized or implemented by computer hardware, a combination of hardware and software, or by computer instructions stored in a non-transitory computer-readable memory.
  • the method can be implemented in a computer program using standard programming techniques, including a non-transitory computer-readable storage medium configured with a computer program, wherein the storage medium so configured enables the computer to operate in a specific and predefined manner-according to specific embodiments
  • Each program can be implemented in a high-level process or object-oriented programming language to communicate with the computer system. However, if necessary, the program can be implemented in assembly or machine language. In any case, the language can be a compiled or interpreted language. Furthermore, the program can be run on a programmed application specific integrated circuit for this purpose.
  • the method can be implemented in any type of computing platform that is operably connected to a suitable computing platform, including but not limited to personal computers, minicomputers, main frames, workstations, network or distributed computing environments, separate or integrated computer platforms , Or communicate with charged particle tools or other imaging devices, etc.
  • Aspects of the present invention can be implemented by machine-readable codes stored on non-transitory storage media or devices, whether removable or integrated into a computing platform, such as hard disks, optical reading and/or writing storage media, RAM, ROM, etc., so that they can be read by a programmable computer, and when the storage medium or device is read by the computer, it can be used to configure and operate the computer to perform the processes described herein.
  • machine-readable code or part thereof, can be transmitted through a wired or wireless network.
  • machine-readable media include instructions or programs that implement the steps described above in combination with a microprocessor or other data processors
  • the invention described herein includes these and other different types of non-transitory computer-readable storage media.
  • the present invention also includes the computer itself.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)

Abstract

L'invention concerne un dispositif de codage pour bande de mesure numérique, comportant un disque codé, un galet; le disque codé présentant un trou débouchant central, un arbre de rotation étant disposé au centre du galet et étant complémentaire du trou débouchant central; un élément élastique métallique étant disposé de façon fixe sur le galet; de multiples groupes de pièces métalliques de contact étant disposés sur une surface latérale du disque codé de manière échelonnée suivant une direction radiale de la surface latérale et faisant saillie hors de la surface latérale, les multiples groupes de pièces métalliques de contact ne recouvrant pas entièrement une surface latérale du disque codé; chaque groupe parmi les multiples groupes de pièces métalliques de contact comportant une ou plusieurs pièces métalliques de contact; l'élément élastique métallique étant disposé sur un quart de cercle du galet, et comportant un ou plusieurs corps élastiques métalliques de contact en forme de bandes, qui sont en nombre égal à celui des multiples groupes de pièces métalliques de contact, sont appariés avec les pièces métalliques de contact et sont espacés les uns par rapport aux autres de manière saillante.
PCT/CN2019/102099 2019-08-12 2019-08-23 Bande de mesure numérique, dispositif de codage pour bande de mesure numérique et procédé de mesure correspondant WO2021026960A1 (fr)

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CN201910739014.8 2019-08-12
CN201910739014.8A CN110608757A (zh) 2019-08-12 2019-08-12 一种数字皮尺、用于数字皮尺的编码装置及相应的测量方法

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CN113237497A (zh) * 2021-04-29 2021-08-10 海信（山东）冰箱有限公司 一种绝对值编码器及洗衣机

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GB2088561A (en) * 1980-10-30 1982-06-09 Bally Mfg Corp Ratio encoder for slot machine reels
US5060394A (en) * 1989-04-20 1991-10-29 Homestar International Inc. Measuring apparatus with readout display
US5142793A (en) * 1989-06-02 1992-09-01 Contek Corporation Digital linear measuring device
CN2679638Y (zh) * 2003-08-25 2005-02-16 李亚兰 双传感器数显卷尺
CN2705776Y (zh) * 2004-05-18 2005-06-22 海欧科技股份有限公司 电子式长度量测装置
CN204479010U (zh) * 2015-03-13 2015-07-15 东莞捷荣技术股份有限公司 一种电子软尺
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