KR102022797B1 - Apparatus for measuring the length of boom using strip type - Google Patents

Abstract

The present invention provides an apparatus for measuring a length of a boom using a strip, which comprises: a spring wound in a body connected to one side of a boom to have an elastic force; a strip of which one end is connected to the spring and the other end is connected to the other end of the boom; and a sensor unit measuring a length of the boom by detecting movement of the strip in accordance with a change in a length of the boom. According to the present invention, the strip can be conveniently stored in the body through the elastic force of the spring, and movement of the strip in accordance with a change in a length of the boom is detected by an optical sensor to measure the length. Therefore, an expensive potentiometer needs not to be used, and instead of a wire rope, drilling or marking such as a letter, a sign, and a mark are detected in a band-shaped strip to measure a length of the boom. In accordance with use of a potentiometer, an error of boom length measurement due to wire abrasion can be fundamentally prevented.

Description

Boom length measuring device using strip {APPARATUS FOR MEASURING THE LENGTH OF BOOM USING STRIP TYPE}

The present invention relates to a boom length measuring apparatus, and more particularly, to a boom length measuring apparatus using a strip capable of measuring the length of the boom by using the strip during the inlet or out of the boom consisting of a multi-stage used for cranes. .

Crane is a equipment that mainly carries heavy materials at the construction site and can carry heavy materials at a desired height by extending and contracting a boom consisting of multiple stages. The multi-stage boom is extended and contracted by a hydraulic cylinder and a wire, and a hook for hanging a load is connected to the end of the boom. The crane may overturn and cause a major accident if the weight of the boom is extended or the weight of the boom is lost when the boom is driven up and down in order to carry the heavy load to a desired position while the heavy hook is placed on the hook at the end of the boom. Therefore, the crane is equipped with a protective device using an AML (Automatic Moment Limiter) method or a pressure switch method that can control the rated load and the working radius using the boom length sensor and the angle sensor for safe operation.

Boom length measurement is made of a cable and a reel, it is possible to use a rotary sensor (rotary sensor) and a multi-rotation potentiometer (potentiometer) attached to the reel, but there is a problem that is very expensive. In the case of using a potentiometer, since the cable (wire rope) is wound around the bobbin in which the sensor is located in multiple layers, there is a fundamental problem that measurement errors due to the thickness or the wound state of the cable may occur. In addition, when the coating of the carbon coating is worn, the resistance value measured by the potentiometer is changed, it is difficult to accurately measure the length, there is a problem that the cable can be entangled or broken.

A hybrid boom length measuring apparatus of Korean Patent Laid-Open Publication No. 10-2016-0121064 is disclosed as a prior art related to the measurement of boom length of the present invention. The prior art measures the length of the wire used for measuring the boom length by using a sus wire, but installs only the interlocking section without installing the wire to the end of the boom, and removes unnecessary wiring by replacing the over winding device with a wireless type. can do. The prior art solves the problem that an error occurs due to peeling of the coating like a wire type using a sus wire, but there is a problem in that installation cost is still high by using a sustain type length sensor such as a potentiometer.

Therefore, there is no need for expensive rotary sensors (rotary sensors) and multi-rotation potentiometers (potentiometers), and it is necessary to develop a new boom length measuring device without using wires that cause measurement errors due to wear.

Republic of Korea Patent Publication No. 10-2016-0121064 (2016.10.19)

The present invention has been made to solve the above problems, an object of the present invention is to use a boom length measuring device using a strip that does not require expensive rotation sensors (rotary sensors) and potentiometers, and does not generate a measurement error due to wear It is to provide.

In order to solve the above problems, a boom length measuring apparatus using a strip according to an embodiment of the present invention is wound inside the body connected to one side of the boom has a spring force, one end is connected to the spring and the other end is the other side of the boom It may include a sensor unit for measuring the length of the boom by detecting the movement of the strip in accordance with the change in the length of the strip and the boom connected to.

According to an embodiment of the present invention, the strip is formed with a perforation, and the sensor unit is positioned above the first light emitting part 210a for emitting light and positioned at the top of the strip 100, and passes through the perforation. And a first light receiver 220a that detects light and outputs an electrical signal, and calculates a length according to the movement of the strip by multiplying the detected number of perforations by the interval d of the perforations.

Any one of letters, symbols, and marks is marked on the upper surface of the strip according to an embodiment of the present invention, and the sensor unit is an optical character reading device for converting the reflected light into an electrical signal by shining light on the letters, symbols, marks, etc. And multiplying the number of detected markings by the interval d of the marking to calculate the length according to the movement of the strip.

According to an embodiment of the present invention, the sensor part includes a first sensor including a first light emitting part 210a and a first light receiving part 220a, and a second sensor including a second light emitting part 210b and a second light receiving part 220b. Includes, the interval between the first sensor and the second sensor is set so as not to coincide with the interval (d) of the perforations formed in the strip, the first sensor signal output from the first sensor and the second output from the second sensor The sensor signal may be processed to determine a moving direction of the strip.

The sensor unit according to an embodiment of the present invention includes at least one guide roller for guiding the strip during sensing, and the guide roller surface is characterized in that the foreign material removal unit for removing the foreign matter on the strip is formed.

According to the present invention as described above, it is possible to easily accommodate the strip into the body by the elastic force of the mainspring, and to use the expensive potentiometer by measuring the length by detecting the movement of the strip according to the change of the length of the boom through an optical sensor no need.

In addition, the length of the boom is measured by detecting markings such as perforations or letters, symbols, and marks on strip-shaped strips instead of wire ropes, thereby preventing boom length measurement errors due to wire wear caused by potentiometers.

1 is a cross-sectional view of the boom length measuring apparatus using a strip according to an embodiment of the present invention.
2 is a view for explaining the operation of the sensor unit according to an embodiment of the present invention.
3A and 3B are diagrams for explaining a process of determining a moving direction of a strip using two sensors according to an embodiment of the present invention.
4 is a block diagram illustrating an operation unit according to an exemplary embodiment of the present invention.
5 is a perspective view of a portion of a strip having perforations according to one embodiment of the invention.

As the invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. Effects and features of the present invention, and methods of achieving them will be apparent with reference to the embodiments described below in detail together with the drawings. However, the present invention is not limited to the embodiments disclosed below but may be implemented in various forms. In the following embodiments, the terms first, second, etc. are used for the purpose of distinguishing one component from other components rather than a restrictive meaning. Also, the singular forms “a”, “an” and “the” include plural forms unless the context clearly indicates otherwise. In addition, the terms including or have means that the features or components described in the specification are present, and does not preclude the possibility of adding one or more other features or components. In addition, in the drawings, components may be exaggerated or reduced in size for convenience of description. For example, the size and thickness of each component shown in the drawings are arbitrarily shown for convenience of description, and thus the present invention is not necessarily limited to the illustrated.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, and the same or corresponding components will be denoted by the same reference numerals, and redundant description thereof will be omitted. .

1 is a cross-sectional view of a boom length measuring apparatus using a strip according to an embodiment of the present invention, Figure 2 is a view for explaining the operation of the sensor unit according to an embodiment of the present invention.

1 and 2, the boom length measuring apparatus 1000 is a strip 100, the mainspring 30 made of a spiral spring having an elastic force connected to one end of the strip and the mainspring are connected to one side of the spring, The other end of the strip is connected to the other side of the boom includes a sensor unit 200 for detecting the movement of the strip in accordance with the change in the length of the boom to measure the boom length.

The boom is composed of multiple stages such as the base boom, the intermediate boom inserted into the base boom, and the tip boom inserted into the intermediate boom, and may be extended or contracted by a hydraulic cylinder and a wire. The boom length measuring device 1000 may be mounted through a boom connecting portion 20 that may be screwed onto one surface of the non-stretched base boom. The strip 100 connected to the mainspring 30 wound around the fixed shaft 31 inside the body 10 may be connected to one surface of the sundam boom through a hook 150 formed at an end thereof. As the length of the boom changes, the strip 100 can be drawn in or drawn out from the body 10. The strip 100 is withdrawn from the inside of the body 10 when the intermediate boom and tip boom are extended. On the other hand, when the intermediate boom and the tip boom is contracted, the strip 100 is drawn back into the body 10 by the elastic force of the main spring 30 wound on the fixed shaft 31 of the body 10 is fixed shaft 31 ), It may be wound in the strip receiving space 40. Therefore, by measuring the moving length of the strip, it is possible to know the moving length of the boom, it is possible to work safely in consideration of the rated load and working radius when operating the crane using the measured moving length of the boom.

The sensor unit 200 may detect the movement of the strip according to the change in the length of the boom. The sensor unit 200 may be installed in the extension body 50 extending from the body 10, and sensing means 210 and 220 sensing the movement of the strip according to the movement of the boom and the sensing means 210 and 220. It may include an operation unit 300 for receiving the electrical signal output by the output unit to calculate the moving length of the strip. The sensor unit 200 may include a first roller 251, a second roller 252, a third roller 261, and a fourth roller 262 to guide the movement of the strip drawn in and drawn out from the extension body 50. And a plurality of guide rollers. The first roller 251 and the second roller 252 are respectively located on both sides of the sensing means to align the strip to the sensing position when sensing the movement of the strip by the sensing means. The third roller 261 may be located at the strip entrance 60 to guide the strip, and the fourth roller 261 may be located at the body 10 side to guide the strip received in the strip storage space 40. can do. The strip 100 may be made of a metal material, and the surface of the plurality of guide rollers is formed with a foreign material removing part such as a brush having a material such as nonwoven fabric, cloth, nylon, etc., to remove foreign matters on the strip in a poor working environment due to rotation. Can be removed.

The sensing means 210 and 220 may detect the movement of the strip through an optical sensor using a photoconductive cell, a photodiode, a phototransistor, a charge coupled device (CCD), or the like. Referring to FIG. 5 to detect the movement of the strip through the optical sensor, the strip 100 is formed in a band shape having a predetermined width and thickness, and has a plurality of perforations penetrating the strip with a predetermined distance d. 110 may be formed. In order to detect the movement of the strip in which the perforation 110 is formed, the sensing means is positioned above the strip 100 and positioned under the first light emitting part 210a and the strip 100 to emit light. It may include a first light receiving unit 220a for detecting light and outputting an electrical signal. On the other hand, the sensing means (210,220) is the second light emitting portion (210b) and the second light receiving portion (210b) in order to secure the continuity of strip movement detection when the first light emitting portion (210a) and the first light receiving portion (220a) is defective 220b) may be further included. Although the second light emitting unit 210b and the second light receiving unit 220b have been described for the duplication of the sensing means, they may be used to determine the moving direction of the strip, and a description of the operation of determining the moving direction of the strip is shown in FIG. 3A. It will be described in detail with reference to FIG. In order to determine the movement of the strip, the sensing means including the additional light emitting part 210b and the second light receiving part 220b has been described. However, the present invention is not limited thereto, and multiplexed sensing may be used by adding a plurality of sensing means.

Herein, although the strip 100 is described as having a perforation 110 formed therein, the present invention is not limited thereto, and letters, symbols, marks, etc. may be marked 111 at a predetermined interval d on the upper surface of the strip 100. Letters, symbol marks and the like can be marked with directionality (eg arrows). When letters, symbols, marks, etc. are marked on the upper surface of the strip, the sensing means is composed of an optical character reader (OCR) instead of the light emitting unit 210 and the light receiving unit 220 described above. Light may be reflected on the back, and the reflected light beam may be converted into an electrical signal and output to the calculation unit 300.

3A and 3B are diagrams for explaining a process of determining a moving direction of a strip using two sensors according to an embodiment of the present invention.

Referring to FIG. 3A, the sensing means includes a first sensor including a first light emitting unit 210a and a first light receiving unit 220a, and a second sensor including a second light emitting unit 210b and a second light receiving unit 220b. Can be. The gap between the first sensor and the second sensor is set so that it does not coincide with the gap d of the perforations formed in the strip 100 (the gap between both sensors is not 1/2 of the gap between the two heaven spaces, for example, In order to generate two OFF signals having different periods when arithmetic processing is performed using an AND operation or an OR operation, etc.) to detect light penetrating the puncturing 110 from one sensor according to the movement of the strip. In this case, the other sensor does not detect the light because the light does not penetrate the perforation 110. When the perforation 110 is aligned with the first sensor position, the first sensor signal 241 output from the first sensor senses light, but the second sensor signal 242 output from the second sensor senses light. It cannot be done. An interference prevention block 230 may be located between the first sensor and the second sensor in order to prevent the detection failure due to the interference of light between each sensor when driving both the first sensor and the second sensor. .

4 is a block diagram illustrating an operation unit according to an embodiment of the present invention. Referring to FIG. 4, the operation unit 300 is output by the light emitting unit 210 and the light receiving unit 220 for detecting a strip having a perforation formed therein. The receiver 301 for receiving at least one electrical signal 241 and 242 and the level of the received electrical signal are counted to calculate the number of punctures, and the strip is obtained by multiplying the calculated number of punctures by a predetermined interval d of the punctures. It may include a length calculation unit 302 for calculating the length according to the movement. On the other hand, when the operation unit 300 receives an image output by an OCR (Opitical Character Reader) for detecting a strip marked with characters, symbols, marks, etc., the operation unit 300 counts the number of the received images in advance. The length according to the strip movement may be calculated by multiplying the set interval d of the marking.

The calculation unit 300 may further include a direction determination unit 303 which may receive a first sensor signal and a second sensor signal respectively output from two sensors and determine a moving direction of the boom.

Referring to FIG. 3B, when the first sensor signal 241 and the second sensor signal 242 are input to the calculator 300, the direction determining unit 303 may input the first sensor signal 241 and the second sensor. An OR operation signal 243 for the signal 242 may be generated to determine the direction of the strip. The OR operation signal 243 generates two OFF signals having different periods, and the OFF signal of a short period always appears first with reference to a sensor that first meets in the direction of travel. That is, when the short period OFF signal first appears on the first sensor side reference, the direction determination unit 303 determines that the strip is drawn out as the boom is extended, and the short period OFF signal first on the second sensor side reference. If it appears, it can be determined that the strip is retracted by the spring force due to the contraction of the boom. Here, it has been described that the two signals generated by the two sensors can be OR-processed to determine the direction of movement of the boom. However, the present invention is not limited thereto and the two signals can be determined by various calculation signal processing such as AND and OR. It can be taken for granted. On the other hand, when a signal output from an optical character reader (OCR: Opitical Character Reader) (OCR) is input to the calculator 300, the direction determining unit 303 preliminarily outputs a signal output from the optical character reader (OCR). The orientation can be determined after reading (e.g., directional arrows, etc.) compared to the stored image.

The calculation unit 300 may be formed of a microcontroller having a predetermined program for measuring the length, and the main part of the crane through wireless communication such as short range communication or wired communication such as USB or serial communication based on the calculated length or moving direction of the strip. It can be transmitted to the control device and used to determine the rated load and working radius.

The present invention has been described in detail with reference to exemplary embodiments, but those skilled in the art to which the present invention pertains can make various modifications without departing from the scope of the present invention. Will understand.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the claims below and equivalents thereof.

10: body 20: boom connection
30: Winding 40: Storage space
50: extension body 60: strip doorway 100: strip 110: perforation
111: marking 200: sensor
210: light emitting unit 220: light receiving unit
230: interference prevention block 241: first sensor signal
242: second sensor signal 251: first roller
252: second roller 261: third roller
262: fourth roller 300: computing unit
301: receiver 302: length calculation
303: direction determination part 1000: boom length measuring device

Claims (5)

Winding spring having elastic force wound around a fixed shaft inside the body connected to one side of the boom,
One end is connected to the mainspring and the other end is connected to the front end boom through the hook 150 and
It includes a sensor unit for measuring the length of the boom by detecting the movement of the strip according to the change in the length of the boom
The sensor unit includes a first sensor including a first light emitting unit 210a and a first light receiving unit 220a, and a second sensor including a second light emitting unit 210b and a second light receiving unit 220b.
The distance between the first sensor and the second sensor is set so as not to coincide with the gap d of the perforations formed in the strip, and to prevent interference between the first sensor and the second sensor in order to prevent the detection failure due to the interference of light between the sensors. The block 230 is located, and determines the length and direction of movement according to the strip movement using the first sensor signal output from the first sensor and the second sensor signal output from the second sensor,
A first roller and a second roller positioned at both sides of the first sensor and the second sensor, respectively, to align the strip at a sensing position, and a third roller and the body 10 positioned at the side of the strip entrance 60 to guide the strip; A fourth roller for guiding the strip housed in the strip storage space 40, the roller surface of which is formed with a foreign material removal portion for removing foreign matters on the strip. Boom length measuring device.
delete The method of claim 1,
Any one of letters, symbols, and marks are marked on the upper surface of the strip, and the sensor unit includes an optical character reading device for converting the reflected rays into electrical signals by shining light on the letters, symbols, marks, etc. Boom length measuring apparatus using a strip, characterized in that to calculate the length of the strip movement by multiplying the number of intervals (d) of the marking.
delete delete

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