CN108714938B - Raw edge sawing method based on photoelectric curtain wall - Google Patents
Raw edge sawing method based on photoelectric curtain wall Download PDFInfo
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- CN108714938B CN108714938B CN201810247863.7A CN201810247863A CN108714938B CN 108714938 B CN108714938 B CN 108714938B CN 201810247863 A CN201810247863 A CN 201810247863A CN 108714938 B CN108714938 B CN 108714938B
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 230000005540 biological transmission Effects 0.000 claims abstract description 7
- 238000012545 processing Methods 0.000 claims description 14
- 238000009966 trimming Methods 0.000 claims description 11
- 238000009826 distribution Methods 0.000 claims description 7
- 238000001514 detection method Methods 0.000 claims description 5
- 238000007493 shaping process Methods 0.000 claims description 4
- 230000001960 triggered effect Effects 0.000 claims description 2
- 239000002023 wood Substances 0.000 description 12
- 239000000463 material Substances 0.000 description 6
- 238000003754 machining Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
- B27B3/00—Gang saw mills; Other sawing machines with reciprocating saw blades, specially designed for length sawing of trunks
- B27B3/02—Gang saw mills; Other sawing machines with reciprocating saw blades, specially designed for length sawing of trunks with vertically-reciprocating saw frame
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
- B27B3/00—Gang saw mills; Other sawing machines with reciprocating saw blades, specially designed for length sawing of trunks
- B27B3/28—Components
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
- B27B31/00—Arrangements for conveying, loading, turning, adjusting, or discharging the log or timber, specially designed for saw mills or sawing machines
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27G—ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
- B27G19/00—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws
- B27G19/006—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws for reciprocating saws
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
- G01B11/04—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness specially adapted for measuring length or width of objects while moving
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Manufacture Of Wood Veneers (AREA)
Abstract
The invention provides a rough edge sawn timber sawing method based on a photoelectric curtain wall, which adopts computing equipment and a sawn timber scanning device to determine the narrowest position of the side edge of a sawn timber in the plane direction, and adjusts the sawing position of a saw blade through the computing equipment; the sawn timber scanning device comprises a conveyor belt and photoelectric curtain wall equipment, wherein the photoelectric curtain wall equipment comprises a sensor fixing frame and light curtain sensors fixed at the sensor fixing frame, and the light curtain sensors are arranged in a straight line and the arrangement direction is perpendicular to the conveying direction of the conveyor belt; each light curtain sensor comprises an infrared emission end and an infrared receiving end which are respectively arranged on and below the transmission surface of the conveyor belt; when the sawn timber is scanned, each transmitting end transmits infrared rays to form a sawn timber scanning light curtain; the method comprises the steps that a receiving end is shielded when sawn timber passes through a sawn timber scanning light curtain, the computing equipment collects identification codes of a shielded light curtain sensor according to preset frequency, and the narrowest position of the sawn timber on the side edge in the plane view direction is calculated according to the identification codes; the invention can automatically determine the narrow edge of the sawn timber and adjust the sawing position of the saw blade.
Description
Technical Field
The invention relates to the technical field of forestry machinery, in particular to a burr sawing method based on a photoelectric curtain wall.
Background
The forest products and wood industry are important fields of Chinese wood consumption. In recent years, the demand of domestic and foreign markets for forest products is greatly increased, the yield of forest products in China is continuously increased, and the yield of forest products in China is first in the world, so that severe tests are brought to the wood supply market in China, and huge market demands are met by stronger productivity and higher quality requirements.
In the actual production process, the wood is cut down and transported to a processing plant for rough machining and finish machining. The wood form also has corresponding requirements in terms of length, width and height (thickness) from log to final regular board, i.e. the board is cut down in terms of length to the required length, and then subjected to subsequent processing of width and height (thickness). Usually, the production line roughly removes the edge skin first, and the log is changed into a rectangular square log similar to a quadrangle when seen from the side. The wood is sawed into equal height (equal thickness) boards by an equally spaced multi-piece sawing machine. The plate formed at the moment meets the requirement of equal length and equal thickness, and further meets the requirement of width. The wood is similar to a trapezoid in the aspect of the width section, so that the bevel edge of the trapezoid is theoretically cut off in the aspect of the utilization rate of the wood, the wood is formed into a rectangular section, and the wood is used as a method for maximizing the utilization rate of the wood, so that the rejection rate of the board can be effectively reduced.
In this regard, conventional machining methods are manual alignment, or cutting methods with a fixed width are used. On the one hand, the two production modes can hardly ensure the processing quality of the product, and on the other hand, the utilization rate of the plate is reduced. One new sawing method is a machine with adjustable saw blade spacing, but the corresponding need is to provide maximum sawing width data for the sheet material. In this regard, a new method is needed to ensure that the sawing of the saw blade is based on the maximum sawing width data of the wood board.
Disclosure of Invention
The invention provides a rough edge sawn timber sawing method based on a photoelectric curtain wall, which can automatically determine the narrow edge of sawn timber and adjust the sawing position of a saw blade.
The invention adopts the following technical scheme.
The method adopts computing equipment and a sawn timber scanning device to determine the narrowest position of the sawn timber in the plane direction side edge, and adjusts the sawn position of a saw blade through the computing equipment; the sawn timber scanning device comprises a conveyor belt and photoelectric curtain wall equipment, wherein the photoelectric curtain wall equipment comprises a sensor fixing frame and light curtain sensors fixed at the sensor fixing frame, and the light curtain sensors are arranged in a straight line and the arrangement direction is perpendicular to the conveying direction of the conveyor belt; each light curtain sensor is provided with a unique identification code and comprises an infrared emission end and an infrared receiving end which are respectively arranged on and below the transmission surface of the conveyor belt; when the sawn timber is scanned, each transmitting end transmits infrared rays to form a sawn timber scanning light curtain which is intersected with a sawn timber transmission path and has a width larger than the maximum width of the sawn timber; the sawn timber is driven by the conveyor belt to shield the infrared receiving end of a part of the light curtain sensors when the sawn timber scans the light curtain, and the computing equipment collects the identification code of the shielded light curtain sensors according to the preset frequency and computes the narrowest position of the side edge of the sawn timber in the top view direction.
The sawn timber is driven by the conveyor belt to pass through the sawn timber scanning light curtain at a constant speed along the long side direction of the sawn timber.
The computing device stores spacing data of each light curtain sensor; the calculation equipment forms a sawn timber side edge acquisition point distribution shape chart according to sawn timber travelling distances in each acquisition interval time, wherein in the shape chart, the sawn timber travelling distance is a longitudinal coordinate, the sawn timber width is a transverse coordinate, and the calculation equipment uses the distribution length of a blocked light curtain sensor at a sensor fixing frame during acquisition as the width of the intersection part of the light curtain and sawn timber.
The computing equipment fits the collection points of the side edges of the sawn timber in the shape graph by a least square method, and calculates edge lines forming the side edges of the sawn timber for processing reference.
The computing equipment determines the narrowest positions of the two side edges of the sawn timber according to the edge lines of the sawn timber side edges formed by fitting calculation, and adjusts the saw blade position according to the narrowest positions of the two side edges of the sawn timber before sawing.
When the sawn timber is required to be processed into the shaping sawn timber with the trapezoid top view direction, the light curtain sensor is linearly arranged at the sensor fixing frame to form a first light curtain array and a second light curtain array, and the first light curtain array and the second light curtain array are respectively arranged above the two side edges of the sawn timber travelling path.
The first light curtain array and the second light curtain array extend from the upper part of the center shaft part of the conveying surface of the conveyor belt to the upper part of the side part of the conveying surface of the conveyor belt.
The light curtain sensors in the first light curtain array and the second light curtain array are uniformly arranged at equal intervals.
The device is characterized in that a part for repeatedly scanning the sawn timber is arranged between the emitting surfaces of the first light curtain array and the second light curtain array, and the part for repeatedly scanning the sawn timber is positioned above the center shaft part of the conveying surface of the conveyor belt.
When the sawn timber is required to be processed into a trimming sawn timber with a rectangular top view, the saw blade cuts into the sawn timber along the direction parallel to the central axis of the sawn timber; when the sawn timber is required to be processed into a trimming sawn timber with a trapezoid top view, the saw blade cuts into the sawn timber along a direction forming an angle with the central axis of the sawn timber.
Compared with the prior art, the invention has the following advantages: 1. the detection method has the advantages of few parts, good adaptability and good interchangeability; can be installed on other machine equipment; 2. the detection method uses the light curtain sensor, and has high measurement accuracy and high resolution. The detection speed is high, and the response speed is high; because an infrared correlation scheme is adopted, the adopted measuring medium can resist external strong light interference (can be assisted by a shading structure), and the data acquisition is faster and more accurate; 3. the whole structure is compact, the processing difficulty is lower, and the whole equipment cost is lower.
In the invention, when the sawn timber is required to be processed into the shaping sawn timber with a trapezoid top view direction, the light curtain sensor is linearly arranged into a first light curtain array and a second light curtain array at the sensor fixing frame, and the first light curtain array and the second light curtain array are respectively arranged above the two side edges of the sawn timber travelling path; the first light curtain array and the second light curtain array extend from the upper part of the center shaft part of the conveying surface of the conveyor belt to the upper part of the side part of the conveying surface of the conveyor belt; a part for repeatedly scanning the sawn timber is arranged between the emitting surfaces of the first light curtain array and the second light curtain array, and the part for repeatedly scanning the sawn timber is positioned above the center shaft part of the conveying surface of the conveyor belt; in the design, as a certain interval is arranged between the infrared emission parts of the first light curtain array and the second light curtain array above the central axis part of the conveying surface of the conveyor belt, a checking structure can be formed, when sawn timber is askew to be sent into the sawn timber scanning light curtain or sawn timber is not arranged at the central axis part of the conveyor belt, one of the first light curtain array and the second light curtain array can not be shielded, so that the board can be sent in an incorrect skew mode, and an alarm can be triggered to enable an operator to readjust the sending posture of the board.
Drawings
The invention is described in further detail below with reference to the attached drawings and detailed description:
FIG. 1 is a schematic illustration of the present invention;
FIG. 2 is an exploded view of the photovoltaic curtain wall apparatus of the present invention as it scans sawn timber;
FIG. 3 is another schematic illustration of the present invention;
FIG. 4 is a schematic illustration of a profile of a sawn timber side acquisition point in accordance with the present invention;
In the figure: 1-a conveyor belt; 2-sawing materials; 3-a photovoltaic curtain wall device; a 4-infrared emission end; 5-a sensor mount; 6-an infrared receiving end; 101-a first light curtain array; 102-a second light curtain array; 103-repeatedly scanning the sawn timber; 104-light curtain sensor.
Detailed Description
1-4, A raw edge sawn timber sawing method based on a photoelectric curtain wall is characterized in that computing equipment and a sawn timber scanning device are adopted to determine the narrowest position of the side edge of a sawn timber in the plane direction, and the sawing position of a saw blade is adjusted through the computing equipment; the sawn timber scanning device comprises a conveyor belt 1 and photoelectric curtain wall equipment 3, wherein the photoelectric curtain wall equipment 3 comprises a sensor fixing frame 5 and light curtain sensors 104 fixed at the sensor fixing frame 5, and the light curtain sensors 104 are arranged in a straight line and the arrangement direction is perpendicular to the conveying direction of the conveyor belt; each light curtain sensor 104 is provided with a unique identification code and comprises an infrared transmitting end 4 and an infrared receiving end 6 which are respectively arranged on and under the transmission surface of the conveyor belt; when the sawn timber 2 is scanned, each transmitting end transmits infrared rays to form a sawn timber scanning light curtain which is intersected with a sawn timber transmission path and has a width larger than the maximum width of sawn timber; the sawn timber 2 shields the infrared receiving end of a part of the light curtain sensor when the sawn timber passes through the sawn timber scanning light curtain under the drive of the conveyor belt 1, and the computing equipment collects the identification code of the shielded light curtain sensor according to the preset frequency and calculates the narrowest position of the sawn timber looking down to the side edge.
The sawn timber 2 is driven by a conveyor belt to scan the light curtain through the sawn timber at a constant speed along the long side direction of the sawn timber.
The computing device stores spacing data of each light curtain sensor; the computing equipment forms a sawn timber side edge acquisition point distribution shape chart according to sawn timber travelling distances in each acquisition interval time, wherein in the shape chart, the sawn timber travelling distance is a longitudinal coordinate, the sawn timber width is a transverse coordinate, and the computing equipment uses the distribution length of the shielded light curtain sensor 104 at the sensor fixing frame 5 during acquisition as the width of the intersection part of the light curtain and the sawn timber.
The computing equipment fits the collection points of the side edges of the sawn timber in the shape graph by a least square method, and calculates edge lines forming the side edges of the sawn timber for processing reference.
The computing equipment determines the narrowest positions of the two side edges of the sawn timber according to the edge lines of the sawn timber side edges formed by fitting calculation, and adjusts the saw blade position according to the narrowest positions of the two side edges of the sawn timber before sawing.
When the sawn timber is required to be processed into the shaping sawn timber with a trapezoid top view, the light curtain sensors are linearly arranged at the sensor fixing frame to form a first light curtain array 101 and a second light curtain array 102, and the first light curtain array 101 and the second light curtain array 102 are respectively arranged above the two side edges of the sawn timber travelling path.
The first light curtain array and the second light curtain array extend from the upper part of the center shaft part of the conveying surface of the conveyor belt to the upper part of the side part of the conveying surface of the conveyor belt.
The light curtain sensors in the first light curtain array and the second light curtain array are uniformly arranged at equal intervals.
The device is characterized in that a part for repeatedly scanning the sawn timber is arranged between the emitting surfaces of the first light curtain array and the second light curtain array, and the part for repeatedly scanning the sawn timber is positioned above the center shaft part of the conveying surface of the conveyor belt.
When the sawn timber is required to be processed into a trimming sawn timber with a rectangular top view, the saw blade cuts into the sawn timber along the direction parallel to the central axis of the sawn timber; when the sawn timber is required to be processed into a trimming sawn timber with a trapezoid top view, the saw blade cuts into the sawn timber along a direction forming an angle with the central axis of the sawn timber.
The conveyor belt in the embodiment is formed by horizontally and linearly arranging more than two conveyor belt mechanisms, and the photoelectric curtain wall equipment 3 is arranged at the juncture interval of the conveyor belt mechanisms; the conveying speeds of the conveying belt mechanisms on the two sides of the photoelectric curtain wall device 3 are the same.
As shown in fig. 3, when determining the position of processing the raw edge saw material into the whole edge saw material, referring to the minimum broadside dimension of the current raw edge saw material, and then retracting according to the blunt edge percentage of each saw material to obtain the sawing position.
If the saw blade cuts in the direction parallel to the central axis of the sawn timber, the sawn timber can be processed into a trimming sawn timber with rectangular top view, and if the saw blade cuts in the direction forming an angle with the central axis of the sawn timber, the sawn timber can be processed into a trimming sawn timber with trapezoidal top view.
When the saw blade is cut in the direction forming an angle with the center axis of the sawn timber, the raw edge sawn timber can be processed into a trapezoid trimming sawn timber in the top view direction; before operation, irregular shapes on the left and right sides of the sawn timber need to be fitted, and a straight line or curve which can be used as a basis for processing is found, so that the computing equipment can control the saw blade to cut the sawn timber according to the straight line or curve.
In the assembly line capable of processing the raw edge sawn timber into the trapezoid trimming sawn timber, the first light curtain array 101 and the second light curtain array 102 are respectively arranged at one end of the conveyor belt, are placed at the upper and lower positions of the conveyor belt for detection, and enable the two pairs of light curtains to have overlapping scanning positions.
As shown in fig. 4, the method can more conveniently fit a reference line used as a whole edge of a trapezoid by using the erection mode, the shapes of the left side and the right side of the sawn timber are not the same, and data points measured on the two sides are respectively fitted to obtain a processing reference. The sensor can measure the broadside size of the measured object in real time, and the broadside size can be set as X; the single chip microcomputer of the sensor and the computing equipment performs communication once at intervals to perform size measurement, so that the distance between each measured broadside size is fixed, and Y is set to be the sawn timber length corresponding to the broadside size; the measured data points are shown in fig. 4; after the data points are fitted by the computing equipment, a processing straight line or a processing curve is formed and used as a saw blade cutting path to control a saw blade to process the sawn timber.
In the above fitting, the data points shown in fig. 4 are measured and then fitted into a straight line. The least squares method is intended to be used for fitting the machining reference line.
The purpose of the fit is to find an approximation function f (x) in a function based on a given N data points (x i,yi). To approximate the set of data. The resulting approximation curve is required to run in the best response data. Curve fitting is the finding of a curve that allows the data points to be located just above or just below the curve. This can represent a general distribution of data points without a small fraction of a relatively large error.
Claims (3)
1. A rough edge sawing method based on a photoelectric curtain wall is characterized by comprising the following steps of: the sawing method adopts a computing device and a sawn timber scanning device to determine the narrowest position of the side edge of sawn timber in the plane direction, and adjusts the sawing position of a saw blade through the computing device; the sawn timber scanning device comprises a conveyor belt and photoelectric curtain wall equipment, wherein the photoelectric curtain wall equipment comprises a sensor fixing frame and light curtain sensors fixed at the sensor fixing frame, and the light curtain sensors are arranged in a straight line and the arrangement direction is perpendicular to the conveying direction of the conveyor belt; each light curtain sensor is provided with a unique identification code and comprises an infrared emission end and an infrared receiving end which are respectively arranged on and below the transmission surface of the conveyor belt; when the sawn timber is scanned, each transmitting end transmits infrared rays to form a sawn timber scanning light curtain which is intersected with a sawn timber transmission path and has a width larger than the maximum width of the sawn timber; the method comprises the steps that when sawn timber passes through a sawn timber scanning light curtain under the drive of a conveyor belt, the infrared receiving end of a part of light curtain sensors is shielded, the computing equipment collects identification codes of the shielded light curtain sensors according to preset frequency, and the narrowest position of the sawn timber looking down to the side edge is calculated according to the identification codes;
When the sawn timber is required to be processed into a shaping sawn timber with a trapezoid top view direction, the light curtain sensor is linearly arranged into a first light curtain array and a second light curtain array at the sensor fixing frame, and the first light curtain array and the second light curtain array are respectively arranged above the two side edges of the sawn timber travelling path;
A part for repeatedly scanning the sawn timber is arranged between the emitting surfaces of the first light curtain array and the second light curtain array, and the part for repeatedly scanning the sawn timber is positioned above the center shaft part of the conveying surface of the conveyor belt;
a checking structure is formed between the infrared emission parts of the first light curtain array and the second light curtain array above the central axis part of the conveying surface of the conveyor belt at preset intervals, when sawn timber is askew to be sent into sawn timber to scan the light curtain or sawn timber is not arranged at the central axis part of the conveyor belt, one of the first light curtain array and the second light curtain array can not be shielded, the down sawing method judges that the plate is sent in an incorrect askew mode, and an alarm is triggered to enable an operator to readjust the feeding posture of the plate;
The sawn timber is driven by a conveyor belt to pass through the sawn timber scanning light curtain at a constant speed along the long side direction of the sawn timber;
The computing device stores spacing data of each light curtain sensor; the calculation equipment forms a sawn timber side edge acquisition point distribution shape chart according to sawn timber travelling distances in each acquisition interval time, wherein in the shape chart, the sawn timber travelling distance is a longitudinal coordinate, the sawn timber width is a transverse coordinate, and the calculation equipment uses the distribution length of a blocked light curtain sensor at a sensor fixing frame during acquisition as the width of the intersection part of the light curtain and sawn timber;
The computing equipment fits the collection points of the side edges of each sawn timber in the shape graph by a least square method, and calculates edge lines of the side edges of the sawn timber for processing and reference;
The light curtain sensors in the first light curtain array and the second light curtain array are uniformly arranged at equal intervals;
When the sawn timber is required to be processed into a trimming sawn timber with a rectangular top view, the saw blade cuts into the sawn timber along the direction parallel to the central axis of the sawn timber; when the sawn timber is required to be processed into a trimming sawn timber with a trapezoid top view, the saw blade cuts into the sawn timber along a direction forming an angle with the center axis of the sawn timber;
In the assembly line for processing the raw edge sawn timber into the trapezoid trimming sawn timber, a first light curtain array and a second light curtain array are respectively arranged at one end of a conveyor belt, are placed at the upper and lower positions of the conveyor belt for detection, and enable two pairs of light curtains to have overlapping scanning positions.
2. The photoelectric curtain wall-based raw edge sawing method is characterized by comprising the following steps of: the computing equipment determines the narrowest positions of the two side edges of the sawn timber according to the edge lines of the sawn timber side edges formed by fitting calculation, and adjusts the saw blade position according to the narrowest positions of the two side edges of the sawn timber before sawing.
3. The photoelectric curtain wall-based raw edge sawing method is characterized by comprising the following steps of: the first light curtain array and the second light curtain array extend from the upper part of the center shaft part of the conveying surface of the conveyor belt to the upper part of the side part of the conveying surface of the conveyor belt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810247863.7A CN108714938B (en) | 2018-03-23 | 2018-03-23 | Raw edge sawing method based on photoelectric curtain wall |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810247863.7A CN108714938B (en) | 2018-03-23 | 2018-03-23 | Raw edge sawing method based on photoelectric curtain wall |
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| CN108714938A CN108714938A (en) | 2018-10-30 |
| CN108714938B true CN108714938B (en) | 2024-04-26 |
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| CN109968456B (en) * | 2019-04-12 | 2020-11-27 | 山东工业职业学院 | Automatic longitudinal cutting system for slope corrugated wood board |
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