CN108714938A - Method is sawed under a kind of unedged sawn timber based on photoelectric curtain wall - Google Patents
Method is sawed under a kind of unedged sawn timber based on photoelectric curtain wall Download PDFInfo
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- CN108714938A CN108714938A CN201810247863.7A CN201810247863A CN108714938A CN 108714938 A CN108714938 A CN 108714938A CN 201810247863 A CN201810247863 A CN 201810247863A CN 108714938 A CN108714938 A CN 108714938A
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- sawn timber
- light curtain
- curtain wall
- sensor
- timber
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 230000005540 biological transmission Effects 0.000 claims abstract description 11
- 238000012545 processing Methods 0.000 claims description 10
- 238000009826 distribution Methods 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 5
- 238000007493 shaping process Methods 0.000 claims description 4
- 238000004364 calculation method Methods 0.000 claims description 3
- 238000003860 storage Methods 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000035611 feeding Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 238000003491 array Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000009021 linear effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000032258 transport Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 239000002023 wood Substances 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
-
- 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
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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
- 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
Abstract
The present invention proposes to saw method under a kind of unedged sawn timber based on photoelectric curtain wall, determines that sawn timber overlooks the most narrow position to side using computing device and sawn timber scanning means, and the lower saw position of saw blade is adjusted by computing device；The sawn timber scanning means includes conveyer belt and photoelectric curtain wall equipment, the photoelectric curtain wall equipment includes fixing rack for sensor and the picking sensor that is fixed at fixing rack for sensor, and the picking sensor is arranged in a straight line and orientation is perpendicular to transmission tape feeding direction；Each picking sensor includes infrared emitting end and the infrared receiver end for being divided into conveyer belt transmission surface upper and lower；When scanning sawn timber, each transmitting terminal transmitting infrared ray forms sawn timber and scans light curtain；Sawn timber blocks receiving terminal when scanning light curtain by sawn timber, the identification code of picking sensor that the computing device is blocked by predeterminated frequency acquisition, and calculates sawn timber with this and overlook most narrow position to side；The present invention can automatically determine sawn timber narrow side and adjust saws position under saw blade.
Description
Technical field
The present invention relates to forest machine technology field, method is sawed under especially a kind of unedged sawn timber based on photoelectric curtain wall.
Background technology
Forestry products, timber industry are China's timber consumption key areas.Recent domestic market is to forestry products demand
It increases, the yield of China's forestry products constantly increases, and the yield of the wherein forestry products in China has ranked the first in the world, in thus also giving
State's timber supply market brings baptism, and the huge market demand needs stronger productivity to meet, while also to expire
Sufficient higher quality requirement.
In the process of actual production, timber transports processing factory and carries out roughing finishing from cutting down.The form of timber
Also the regular plank from round log to the end, that is, the length, width and height in plank（Thickness）Aspect has corresponding requirement, long in plank
In terms of degree, round log is cut down with desired length, then is carried out subsequently to Width x Height（Thickness）Processing.Usual production line is first rough
Flaw-piece is removed, round log becomes the rectangular timber of approximate quadrangle from the side.By equidistant multiple blade saw machine, by timber
The height such as it is sawed into（Equal thickness）Plank.The plank formed at this time meets isometric uniform thickness requirement, needs further exist for meeting width
Requirement.Since timber at this time is to be similar to trapezoidal in width section, in terms of the utilization rate of timber, theoretically cut off
Trapezoidal bevel edge, it is a kind of method for maximally utilizing timber to make wood formation rectangular section, can effectively reduce the useless of plank
Product rate.
In this regard, traditional processing method is artificial alignment, or the cutting mode using fixed width.Both producers
On the one hand formula cannot be difficult to ensure that the processing quality of product, the utilization rate of another aspect plank decline.A kind of novel sawing side
Formula is the machine of adjustable saw blade spacing, but needs to provide the maximum sawing width data of plank accordingly.In this regard, just needing one
The novel method of kind, can guarantee that the lower saw of saw blade is the maximum sawing width data according to plank.
Invention content
The present invention proposes to saw method under a kind of unedged sawn timber based on photoelectric curtain wall, can automatically determine sawn timber narrow side and adjust
Position is sawed under saw blade.
The present invention uses following technical scheme.
Method is sawed under a kind of unedged sawn timber based on photoelectric curtain wall, the lower saw method is scanned using computing device and sawn timber
Device determines that sawn timber overlooks the most narrow position to side, and the lower saw position of saw blade is adjusted by computing device；The sawn timber
Scanning means includes conveyer belt and photoelectric curtain wall equipment, and the photoelectric curtain wall equipment includes fixing rack for sensor and is fixed on sensing
Picking sensor at device fixed frame, the picking sensor is arranged in a straight line and orientation is perpendicular to transmission tape feeding direction；
Each picking sensor with exclusive identification code and include be divided into conveyer belt transmission surface upper and lower infrared emitting end and
Infrared receiver end；When scanning sawn timber, each transmitting terminal transmitting infrared ray formation is intersected with sawn timber transmission path and width is more than
The sawn timber of sawn timber maximum width scans light curtain；Part light curtain is sensed when sawn timber scans light curtain under belt-driven by sawn timber
The infrared receiver end of device is blocked, the mark for the picking sensor that the computing device is blocked by predeterminated frequency acquisition
Code, and sawn timber is calculated with this and overlooks most narrow position to side.
The sawn timber is under belt-driven, by sawn timber long side direction at the uniform velocity to scan light curtain by sawn timber.
The computing device storage has the spacing data of each picking sensor；When the computing device is with each secondary acquisition interval
In sawn timber travel distance form sawn timber side collection point distribution shape figure, in the shape graph, sawn timber travel distance is
Longitudinal coordinate, sawn timber width are lateral coordinates, and the picking sensor being blocked when computing device is to acquire is in fixing rack for sensor
The distribution length at place is the width of light curtain and sawn timber intersection area.
The computing device is fitted each sawn timber side collection point in shape graph with least square method, calculates and is formed
The edge line of sawn timber side is for processing reference.
The computing device according to the Fitting Calculation formed sawn timber side edge line judge sawn timber both sides edge most narrow position, and
Saw blade position is adjusted along most narrow position position according to sawn timber both sides before lower saw.
When that need to be to overlook to trapezoidal shaping sawn timber sawing, the picking sensor be in fixing rack for sensor
Locate arranged in a straight line to be the first light curtain array and the second light curtain array, the first light curtain array, the second light curtain array are respectively arranged on sawn timber
The both sides of travel path are along top.
First light curtain array, the second light curtain array extend to conveyer belt by conveyer belt conveyor surface axis position top
Above conveyor surface side.
Picking sensor in first light curtain array, the second light curtain array is equidistantly evenly distributed.
First light curtain array, the second light curtain array the surface of emission between be equipped with to sawn timber carry out multiple scanning portion
Position, the position that multiple scanning is carried out to sawn timber are located above conveyer belt conveyor surface axis position.
When that need to be to overlook to rectangular treating selvedge sawn timber sawing, saw blade be sawed along parallel with sawn timber axis to incision
Material；When that need to be to overlook to trapezoidal treating selvedge sawn timber sawing, saw blade be cut along the direction at an angle with sawn timber axis
Enter sawn timber.
Patent of the present invention is compared with existing technology and is had the following advantages：1, the detection method part is few, can suitability it is good,
Interchangeability is good；It may be mounted in other machinery equipment；2, the detection method uses picking sensor, high certainty of measurement to differentiate
Rate is also higher.Detection speed is fast, fast response time；Due to using infrared radiation program, the measurement medium of use that can resist the external world
Strong light interference（Light-shielding structure can be aided with）, data acquire faster, more precisely；3, compact overall structure, difficulty of processing is relatively low, whole
It is relatively low that body equips cost.
In the present invention, when that need to be to overlook to trapezoidal shaping sawn timber sawing, the picking sensor passing
Arranged in a straight line at sensor fixed frame is the first light curtain array and the second light curtain array, the first light curtain array, the second light curtain array point
Not She Yu sawn timber travel path both sides along top；First light curtain array, the second light curtain array are by conveyer belt conveyor surface
It is extended to above axis position above conveyer belt conveyor surface side；The surface of emission of first light curtain array, the second light curtain array
Between be equipped with to sawn timber carry out multiple scanning position, it is described to sawn timber carry out multiple scanning position be located at conveyer belt conveyor surface
Above axis position；In this design, due to the first light curtain array, the second light curtain array above conveyer belt conveyor surface axis position
Infrared emitting position between there are certain intervals, verification structure can be formed, when sawn timber crooked feedings sawn timber scanning light curtain
Or sawn timber is not disposed in conveyer belt axis position constantly, and one in the first light curtain array, the second light curtain array may can not
Be blocked, in this way it is determined that plank be by it is incorrect it is crooked in a manner of be sent into, can trigger alert so that operating personnel weight
New adjustment plank is sent into posture.
Description of the drawings
The present invention is described in more detail with reference to the accompanying drawings and detailed description：
Attached drawing 1 is the schematic diagram of the present invention；
Attached drawing 2 is decomposition diagram of the photoelectric curtain wall equipment of the present invention when scanning sawn timber；
Attached drawing 3 is another schematic diagram of the present invention；
Attached drawing 4 is the schematic diagram of the sawn timber side collection point distribution shape figure of the present invention；
In figure：1- conveyer belts；2- sawn timbers；3- photoelectric curtain wall equipment；4- infrared emittings end；5- fixing rack for sensor；6- is infrared
Line receiving terminal；The first light curtain arrays of 101-；The second light curtain arrays of 102-；103- carries out sawn timber at the position of multiple scanning；104-
Picking sensor.
Specific implementation mode
As shown in Figs 1-4, method is sawed under a kind of unedged sawn timber based on photoelectric curtain wall, the lower saw method is set using calculating
Standby and sawn timber scanning means determines that sawn timber overlooks the most narrow position to side, and the lower saw position of saw blade is adjusted by computing device
It sets；The sawn timber scanning means includes conveyer belt 1 and photoelectric curtain wall equipment 3, and the photoelectric curtain wall equipment 3 is fixed including sensor
Frame 5 and the picking sensor 104 being fixed at fixing rack for sensor 5, the picking sensor 104 is arranged in a straight line and orientation
Perpendicular to transmission tape feeding direction；Each picking sensor 104 with exclusive identification code and includes being divided into conveyer belt transmission
The infrared emitting end 4 and infrared receiver end 6 of face upper and lower；When scanning sawn timber 2, each transmitting terminal transmitting infrared ray is formed
Intersect with sawn timber transmission path and width scans light curtain more than the sawn timber of sawn timber maximum width；Sawn timber 2 leads under the driving of conveyer belt 1
The infrared receiver end of part picking sensor is blocked when crossing sawn timber scanning light curtain, the computing device presses predeterminated frequency
It acquires the identification code of picking sensor being blocked, and sawn timber is calculated with this and overlooks most narrow position to side.
The sawn timber 2 is under belt-driven, by sawn timber long side direction at the uniform velocity to scan light curtain by sawn timber.
The computing device storage has the spacing data of each picking sensor；When the computing device is with each secondary acquisition interval
In sawn timber travel distance form sawn timber side collection point distribution shape figure, in the shape graph, sawn timber travel distance is
Longitudinal coordinate, sawn timber width are lateral coordinates, and the picking sensor 104 being blocked when computing device is to acquire is fixed in sensor
Distribution length at frame 5 is the width of light curtain and sawn timber intersection area.
The computing device is fitted each sawn timber side collection point in shape graph with least square method, calculates and is formed
The edge line of sawn timber side is for processing reference.
The computing device according to the Fitting Calculation formed sawn timber side edge line judge sawn timber both sides edge most narrow position, and
Saw blade position is adjusted along most narrow position position according to sawn timber both sides before lower saw.
When that need to be to overlook to trapezoidal shaping sawn timber sawing, the picking sensor be in fixing rack for sensor
Locate arranged in a straight line to be the first light curtain array 101 and the second light curtain array 102, the first light curtain array 101, the second light curtain array 102
The both sides of sawn timber travel path are respectively arranged on along top.
First light curtain array, the second light curtain array extend to conveyer belt by conveyer belt conveyor surface axis position top
Above conveyor surface side.
Picking sensor in first light curtain array, the second light curtain array is equidistantly evenly distributed.
First light curtain array, the second light curtain array the surface of emission between be equipped with to sawn timber carry out multiple scanning portion
Position, the position that multiple scanning is carried out to sawn timber are located above conveyer belt conveyor surface axis position.
When that need to be to overlook to rectangular treating selvedge sawn timber sawing, saw blade be sawed along parallel with sawn timber axis to incision
Material；When that need to be to overlook to trapezoidal treating selvedge sawn timber sawing, saw blade be cut along the direction at an angle with sawn timber axis
Enter sawn timber.
Conveyer belt in this example is rearranged by more than two conveyer mechanism horizontal linears, and photoelectric curtain wall equipment 3 is set
In the boundary interval of conveyer mechanism；The conveying speed of the conveyer mechanism of 3 both sides of photoelectric curtain wall equipment is identical.
As shown in figure 3, by unedged sawn timber be processed into treating selvedge sawn timber location determination when, with reference to current unedged sawn timber
Then minimum broadside size is retracted according to each equal sawn timbers wane percentage as sawing position.
Then can be to overlook to rectangular treating selvedge sawn timber sawing if saw blade edge is parallel with sawn timber axis to incision,
Then can be to overlook to trapezoidal treating selvedge sawn timber sawing if saw blade is cut along with sawn timber axis direction at an angle.
When saw blade is along the direction incision at an angle with sawn timber axis, unedged sawn timber can also be processed as overlooking to trapezoidal
Treating selvedge sawn timber；It needs the irregular shape to sawn timber the right and left to be fitted before being operated, finds out and can be used as foundation
The straight line or curve being processed make computing device that can control blade cutting saw material according to this straight line or curve.
Unedged sawn timber can be processed into the assembly line of trapezoidal treating selvedge sawn timber, by the first light curtain array 101 and the second light
In conveyer belt one end, the position for being put in conveyer belt or more is detected curtain 102 each frame of array, and two pairs of light curtains is made to be swept in the presence of coincidence
The position retouched.
As shown in figure 4, this method can be fitted conveniently using this erection mode as the ginseng for processing trapezoidal treating selvedge
The shape of directly line, sawn timber the right and left can't be identical, and the data point measured respectively to both sides is fitted to obtain
Process reference.Sensor can measure the broadside size of measured object in real time, can broadside size be set as X；Sensor and calculating are set
Standby microcontroller, which carries out once communicating at regular intervals, carries out dimensional measurement, therefore the spacing between the broadside size each measured is
It is fixed, Y is set as the corresponding length of broadside size；The data point measured is as shown in Figure 4；Computing device is to these data
After point is fitted, processing linear or processing curve are formed, sawn timber is processed as saw blade cutting path control saw blade.
In fitting above, measures to be fitted after data point as shown in Figure 4 and be in line.It is quasi- to use least square
Method is processed the fitting with reference to straight line.
The purpose of fitting is with given N number of data point（xi, yi）On the basis of an approximate function is found out in a kind of function
f（x）.Carry out this group of data of approximate expression.Need the trend for the response data that finally obtained curve of approximation can be best.Curve is quasi-
Conjunction be exactly find out a curve by data point can above or below this curve nearby.It in this way can be with body
Reveal the general distribution of data point, and is not in the bigger error of fraction.
Claims (10)
1. sawing method under a kind of unedged sawn timber based on photoelectric curtain wall, it is characterised in that：The lower saw method uses computing device
It determines that sawn timber overlooks the most narrow position to side with sawn timber scanning means, and adjusts the lower saw position of saw blade by computing device
It sets；The sawn timber scanning means includes conveyer belt and photoelectric curtain wall equipment, and the photoelectric curtain wall equipment includes fixing rack for sensor
With the picking sensor being fixed at fixing rack for sensor, the picking sensor is arranged in a straight line and orientation is perpendicular to transmission
Tape feeding direction；Each picking sensor with exclusive identification code and includes being divided into the red of conveyer belt transmission surface upper and lower
Outside line transmitting terminal and infrared receiver end；When scanning sawn timber, each transmitting terminal transmitting infrared ray is formed and sawn timber transmission path phase
It hands over and width scans light curtain more than the sawn timber of sawn timber maximum width；Sawn timber passes through when sawn timber scanning light curtain pairs under belt-driven
The infrared receiver end of part picking sensor is blocked, and the computing device is passed by the light curtain that predeterminated frequency acquisition is blocked
The identification code of sensor, and sawn timber is calculated with this and overlooks most narrow position to side.
2. sawing method under a kind of unedged sawn timber based on photoelectric curtain wall according to claim 1, it is characterised in that：The saw
Material is under belt-driven, by sawn timber long side direction at the uniform velocity to scan light curtain by sawn timber.
3. sawing method under a kind of unedged sawn timber based on photoelectric curtain wall according to claim 2, it is characterised in that：The meter
Calculating equipment storage has the spacing data of each picking sensor；The computing device is advanced with the sawn timber in each secondary acquisition interval time
Distance forms sawn timber side collection point distribution shape figure, and in the shape graph, sawn timber travel distance is longitudinal coordinate, sawn timber is wide
Degree is lateral coordinates, and distribution length of the picking sensor being blocked when computing device is to acquire at fixing rack for sensor is light
The width of curtain and sawn timber intersection area.
4. sawing method under a kind of unedged sawn timber based on photoelectric curtain wall according to claim 3, it is characterised in that：The meter
It calculates equipment to be fitted each sawn timber side collection point in shape graph with least square method, calculates the edge for forming sawn timber side
Line is for processing reference.
5. sawing method under a kind of unedged sawn timber based on photoelectric curtain wall according to claim 4, it is characterised in that：The meter
It calculates equipment and the most narrow position that sawn timber side edge line judges sawn timber both sides edge is formed according to the Fitting Calculation, and according to sawn timber before lower saw
Both sides are adjusted saw blade position along most narrow position position.
6. sawing method under a kind of unedged sawn timber based on photoelectric curtain wall according to claim 1, it is characterised in that：When needing handle
Sawing is when overlooking to trapezoidal shaping sawn timber, and it is that the picking sensor is arranged in a straight line at fixing rack for sensor
One light curtain array and the second light curtain array, the first light curtain array, the second light curtain array are respectively arranged on the both sides of sawn timber travel path
Along top.
7. sawing method under a kind of unedged sawn timber based on photoelectric curtain wall according to claim 6, it is characterised in that：Described
One light curtain array, the second light curtain array are extended to by conveyer belt conveyor surface axis position top on conveyer belt conveyor surface side
Side.
8. sawing method under a kind of unedged sawn timber based on photoelectric curtain wall according to claim 6, it is characterised in that：Described
Picking sensor in one light curtain array, the second light curtain array is equidistantly evenly distributed.
9. sawing method under a kind of unedged sawn timber based on photoelectric curtain wall according to claim 6, it is characterised in that：Described
One light curtain array, the second light curtain array the surface of emission between be equipped with to sawn timber carry out multiple scanning position, it is described to sawn timber into
The position of row multiple scanning is located above conveyer belt conveyor surface axis position.
10. sawing method under a kind of unedged sawn timber based on photoelectric curtain wall according to claim 6, it is characterised in that：When need
It is when overlooking to rectangular treating selvedge sawn timber sawing, saw blade is along parallel with sawn timber axis to incision sawn timber；When need to be saw
When material is processed as overlooking to trapezoidal treating selvedge sawn timber, saw blade cuts sawn timber along with sawn timber axis direction at an angle.
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 |
Applications Claiming Priority (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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108714938A true CN108714938A (en) | 2018-10-30 |
| CN108714938B CN108714938B (en) | 2024-04-26 |
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| CN201810247863.7A Active CN108714938B (en) | 2018-03-23 | 2018-03-23 | Raw edge sawing method based on photoelectric curtain wall |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109968456A (en) * | 2019-04-12 | 2019-07-05 | 山东工业职业学院 | A kind of automatic longitudinal sectional system of the stupefied plank in slope |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109968456A (en) * | 2019-04-12 | 2019-07-05 | 山东工业职业学院 | A kind of automatic longitudinal sectional system of the stupefied plank in slope |
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