A plate cutting mode switching method of an intelligent edge trimming saw machine

Abstract

The present application relates to a kind of intelligent edge sawing machine plate cutting mode switching mode, before wood is transported to visual scanning area, the length of wood is detected;According to the length of wood, corresponding delay time is set;After the wood is transported to the most front deviation roller in visual scanning area, start timing, after reaching delay time, deviation roller stops conveying;Visual identification system acquires the surface image of wood in detection area, and the preset cutting line between the maximum cutting width of two inner contour curves is calculated;According to the deviation distance between preset cutting line and actual cutting line, different delay time is set for different length of wood board, the stop position of wood board is different, customers can process shorter wood board, improve the yield of wood, improve production benefit;Mobile wood board is once in place, only deviation is carried out once, mobile precision is increased, the service life of mobile module is increased, and the use frequency of camera and industrial computer is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of intelligent edge sawing machine plate cutting mode switching mode, belongs to timber processing technical field. BACKGROUND

[0002] The shortest wood that can be sawn by the intelligent edge sawing machine on the market is more than 420 mm, and wood boards below 400 mm cannot be sawn. In conventional feeding sawing, the length of the wood board must be greater than 420 mm.

[0003] There are many types of intelligent edge sawing machines on the market, and the principles of wood board deviation correction movement are different. Currently, the wheel pressing wood board deviation correction movement is more common, but the principles of movement deviation correction are different.

[0004] Currently, some intelligent edge sawing machines use the wheel pressing wood board deviation correction movement, and most of them use the first deviation correction angle, the second or second / third deviation correction distance, which requires multiple deviation corrections.

[0005] The first deviation correction angle movement causes a certain error in the angle deviation due to the pixel error of visual imaging, resulting in a large error in the movement of the corrected wood board.

[0006] The first deviation correction angle is followed by a second or second / third deviation correction distance by taking a photo, which increases the time and efficiency of taking two or three photos.

[0007] The two or three times of photographing and deviation correction increase the burden on the camera and industrial computer memory, which can easily cause memory overflow or malfunction.

[0008] The two or three times of photographing and deviation correction increase the number of times the deviation correction module moves back and forth and the frequency of servo motor action, reducing the service life of the movement module. SUMMARY

[0009] The present application aims to provide an intelligent edge sawing machine plate cutting mode switching method to solve the problems raised in the background art.

[0010] The technical solution of the present application is as follows:

[0011] An intelligent edge sawing machine plate cutting mode switching method includes the following steps:

[0012] Detect the length of the wood before it is transported to the visual scanning area;

[0013] Set the corresponding delay time according to the length of the wood;

[0014] Start timing after the wood is transported to the deviation correction roller at the front of the visual scanning area, and stop the deviation correction roller after the delay time is reached.

[0015] The visual recognition system collects the surface image of the wood in the detection area, and extracts the inner contour curve of the wood board in the image;

[0016] The maximum cutting width between the two inner contour curves of the wood board is calculated;

[0017] The preset cutting line of the maximum cutting width between the two inner contour curves is calculated;

[0018] According to the deviation distance between the preset cutting line and the actual cutting line, the wood board is moved by the corresponding deviation distance driven by the deviation roller.

[0019] Preferably, the two irregular inner contour curves are fitted through a certain number of points respectively;

[0020] The distance between the connecting lines of the two points from the two inner contour curves respectively is calculated, and the connecting line with the shortest distance is taken;

[0021] Two parallel preset cutting lines are preset between the two inner contour curves, and the preset cutting line is perpendicular to the connecting line with the shortest distance;

[0022] The intersection point of the rotation axis of each deviation roller and the preset cutting line is extracted, and the deviation distance between the corresponding intersection point of each deviation roller and the cutting line to be cut is calculated.

[0023] Preferably, the distance between the two adjacent points on the irregular inner contour curve is the same.

[0024] Preferably, the visual recognition system calculates the inner and outer contour curves of the wood board through a deep learning algorithm.

[0025] Preferably, the deviation roller comprises an upper roller, a lower roller, a horizontal moving assembly and an elastic member, the upper roller is driven to tend to approach the lower roller through the elastic member, and the horizontal moving assembly pushes the upper roller and the lower roller to displace along the direction of the rotation axis thereof synchronously.

[0026] Preferably, the outer surface of the upper roller and / or the lower roller is provided with a friction pattern.

[0027] Preferably, a position sensor is further comprised, and the position sensor is used for monitoring the relative position between the upper roller and the lower roller.

[0028] Preferably, a sawing conveying compression roller group is arranged between the deviation roller and the saw blade group.

[0029] Preferably, the wood is conveyed to the visual scanning area through a feeding conveying compression roller group, and a length measuring sensor is arranged at the feeding conveying compression roller group.

[0030] The present application has the following beneficial effects:

[0031] Different length of wood board sets different time delay, realizes that wood board parking position is different, makes the customer be able to process shorter wood board, saves the artificial cost, improves the out material rate of wood, improves the production benefit;

[0032] Mobile wood board is once in place, only carries out once deviation correction, moves accurately, increases the service life of mobile module, reduces the use frequency of camera and industrial computer, improves work efficiency.

[0033] Feeding conveying frame transports wood board to visual scanning area, after being photographed by the industrial camera of visual identification system, enters visual software, calculates the optimal cutting scheme, and draws cutting line.

[0034] Through the given virtual origin line position, the distance between the center line of the pressure wheel and the cutting line is measured by software, and then the moving distance of the two deviation correction rollers is calculated according to the position relationship between the origin line at the saw blade and the saw blade group, and the moving distance is transmitted to the PLC control servo motor to move to the corresponding position according to the given value.

[0035] This moving mode is simple, easy to understand, the image recognition data amount is small, the calculation speed is fast, and the moving position is once formed. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 It is a working state structure schematic view of the conventional plate wood cutting machine of the application;

[0037] Figure 2 It is a working state structure schematic view of the short and thin plate wood cutting machine of the application;

[0038] Figure 3 It is a deviation correction principle structure schematic view;

[0039] Figure 4 It is a deviation correction roller structure schematic view.

[0040] 1, saw blade group;2, sawing conveying pressure wheel group;3, wood board parking position A;4, deviation correction front roller sensor;5, deviation correction rear roller sensor;6, feeding inlet roller sensor;7, deviation correction front roller;8, deviation correction rear roller;9, wood board at visual scanning area;10, feeding inlet waiting wood board;11, visual scanning area;12, feeding conveying pressure wheel group;13, wood board parking position B;14, length measurement inductor;

[0041] 71, upper roller;72, lower roller;73, transverse moving assembly;74, elastic member. DETAILED DESCRIPTION

[0042] The application will be described in detail below in combination with the drawings and specific embodiments.

[0043] Embodiment: as Figures 1-4As shown in the drawings:

[0044] When the wood board enters the feeding port, the feeding conveying roller group 12 is lifted, and the feeding port roller sensor 6 detects that the wood board passes through the feeding conveying roller group 12 to cause lifting to send a signal to the processor (PLC or single-chip microcomputer), and after the processor receives the signal, the length measurement sensor 14 starts to calculate the walking distance of the roller in the feeding conveying roller group 12. When a wood board passes, the length measurement sensor 14 calculates the length of the wood board and transmits the calculation result to the processor. The wood board is divided into three categories: the wood board with a length of 420mm-630mm is a regular board, the wood board with a length of 330mm-420mm is a short and thin board, and the wood board with a length longer than 630mm or shorter than 330mm is an excessively long or short board.

[0045] As shown in the drawings: Figure 1 When the regular board (420mm-630mm) is transported to the visual scanning area 11 by the feeding conveying roller group 12, the processor sets a delay time of 150ms when the length measurement sensor 14 judges that it is a regular board. When the wood board 9 at the visual scanning area enters the visual scanning area 11, the post-correction roller 8 is lifted first, and at this time, the corresponding post-correction roller sensor 5 detects that the wood board 9 at the visual scanning area passes through the post-correction roller 8 to cause lifting to send a signal to the processor. Then, the pre-correction roller 7 is lifted, and at this time, the corresponding pre-correction roller sensor 4 detects that the wood board 9 at the visual scanning area passes through the pre-correction roller 7 to cause lifting to send a signal to the processor. After the processor receives the signal sent by the pre-correction roller sensor 4, the timing starts, and after the set delay time of 150ms is reached, the feeding of the pre-correction roller 7, the post-correction roller 8 and the feeding conveying roller group 12 is stopped, and the sawing conveying roller group 2 does not stop. At this time, the front side of the wood board 9 at the visual scanning area is stopped at the wood board stopping position A3 (close to the edge of the visual scanning area), and the wood board 10 at the feeding port waits behind;

[0046] The wood board 9 at the visual scanning area is moved to the corresponding specification for correction, and at the same time, the pre-correction roller 7 and the post-correction roller 8 are started to transport the wood board 9 at the visual scanning area into the sawing conveying roller group 2. After the post-correction roller sensor 5 detects that the post-correction roller 8 is returned, the feeding conveying roller group 12 is started to forwardly transport the wood board 10 at the feeding port to the visual scanning area 11 to become the wood board 9 at the visual scanning area. This work is cycled to realize that the wood boards enter the sawing group 1 one by one for cutting.

[0047] As shown in the drawings: Figure 2As shown, the short board (330mm-420mm) is transported to the vision scanning area 11 by the feeding conveying pressure roller group 12, and the processor sets a delay time of 30ms when the length measuring sensor 14 judges that it is a short board; the delay time is reduced by the disengagement signal of the pre-correction roller sensor 4, the processor starts timing after receiving the signal sent by the pre-correction roller sensor 4, and stops the transportation of the pre-correction roller 7, the post-correction roller 8, and the feeding conveying pressure roller group 12 after reaching the set delay time of 30ms, while the sawing conveying pressure roller group 2 does not stop; at this time, the front side of the board 9 at the vision scanning area is stopped at the board stopping position B13, and the pre-correction roller 7 and the post-correction roller 8 can still press the board at the same time; the correction is followed by the cutting action.

[0048] The excessively long or short board cannot enter the machine in principle due to mechanism limitations, but the machine automatically stops when the excessively long or short board is detected, and the board needs to be manually removed.

[0049] The board is transported to the vision scanning area 11, and the industrial camera of the visual recognition system is located directly above the vision scanning area 11, which takes a picture of the board 9 at the vision scanning area 11 to obtain the image of the board 9 at the vision scanning area 11.

[0050] The visual software of the visual recognition system calculates the inner and outer contours of the board 9 at the vision scanning area 11 through a deep learning algorithm, and the part between the inner and outer contours of the board 9 at the vision scanning area 11 is the part that is not needed. Figure 3 As shown, the inner contour is two irregular curves composed of a certain number of equally spaced points, and the distance of each line is calculated and compared according to the line connecting different points on the two curves, and the line with the smallest distance is taken as the center point of the two preset cutting lines (such as the two dashed lines in Figure 3 ) in the length direction of the board 9 at the vision scanning area 11, which are symmetrically arranged, and the distance between the two preset cutting lines is the maximum cuttable width of the inner contour. The actual cutting width obtained from the saw blade group 1 is less than or equal to the maximum cuttable width, that is, the cutting line of the board 9 at the vision scanning area 11.

[0051] The pre-correction roller 7 and the post-correction roller 8 are both correction rollers, the front part of the board 9 at the vision scanning area 11 is clamped by the pre-correction roller 7, and the rear part of the board 3 is clamped by the post-correction roller 8. Figure 4As shown, the wood board 9 at the visual scanning area is clamped between the upper roller 71 and the lower roller 72, the upper roller 71 is pushed to be close to the lower roller 72 due to the elastic force of the elastic member 74, the wood board 9 at the visual scanning area is clamped between the upper roller 71 and the lower roller 72; the wood board 9 at the visual scanning area has a large friction force between the upper roller 71 and the lower roller 72, and can clamp the wood board 9 at the visual scanning area to move; the horizontal moving assembly 73 adopts a screw rod transmission structure driven by a servo motor, the upper roller 71 and the lower roller 72 are driven to rotate by corresponding motors, the moving direction of the horizontal moving assembly 73 is consistent with the rotation axis of the upper roller 71 and the lower roller 72, and the upper roller 71, the lower roller 72 and the wood board 9 at the visual scanning area clamped by the upper roller 71 and the lower roller 72 are moved by the horizontal moving assembly 73.

[0052] As shown in Figure 3 , the intersection point of the rotation axis of the pre-correction roller 7 and the projection of one of the preset cutting lines on the horizontal plane is set as A2, and the intersection point of the rotation axis of the post-correction roller 8 and the projection of one of the preset cutting lines on the horizontal plane is set as B2; an initial comparison line is also preset, the intersection point of the rotation axis of the pre-correction roller 7 and the initial comparison line is set as A1, and the intersection point of the rotation axis of the post-correction roller 8 and the initial comparison line is set as B1; it is assumed that the point C2 is the point of the position to be cut.

[0053] The rotation axes of the pre-correction roller 7 and the post-correction roller 8 and the cutting lines of the saw blade group 1 can be pre-built in the visual software of the visual identification system to form a background image, and the image of the wood board 9 at the visual scanning area obtained by shooting is compared and calculated with the background image. The rotation axes of the pre-correction roller 7 and the post-correction roller 8 can also be obtained by shooting the pre-correction roller 7 and the post-correction roller 8 in real time.

[0054] According to the preset cutting line of the wood board 9 at the visual scanning area, the moving distance of the pre-correction roller 7 clamping the front part of the wood board 9 at the visual scanning area is LC-LA, and the moving distance of the post-correction roller 8 clamping the rear part of the wood board 9 at the visual scanning area is LC-LB, the pre-correction roller 7 and the post-correction roller 8 are controlled to move corresponding distances along the axis direction by the processor, and the wood board 9 clamped at the visual scanning area is moved to the corresponding specification at one time, so that the wood board 9 at the visual scanning area is moved to the position.

[0055] As shown in Figure 1 , the saw blade group 1 can cut the wood board 9 at the visual scanning area into 32MM, 42MM, 52MM, 62MM, 72MM and other specifications.

[0056] The pre-correction roller sensor 4 can be a transmitting photoelectric sensor. When the wood board is inserted between the upper roller 71 and the lower roller 72 of the pre-correction roller 7, the upper roller 71 is away from the lower roller 72 by a distance, at this time, the pre-correction roller sensor 4 cannot detect the upper roller 71, thus sending a lifting signal to the processor; when the wood board is separated from the upper roller 71 and the lower roller 72, the upper roller 71 is pushed to be close to the lower roller 72 by the elastic member 74 to reset, at this time, the pre-correction roller sensor 4 can detect the upper roller 71; the cooperation principle of the other post-correction roller sensor 5, the post-correction roller 8 and the feed inlet roller sensor 6 and the feed conveying pressure roller set 12 is the same as above, and will not be repeated here.

[0057] The structures of the feed conveying pressure roller set 12, the pre-correction roller 7 and the post-correction roller 8 are the same, and the difference is that the feed conveying pressure roller set 12 does not need to drive the wood board to move along the rotation axis direction.

[0058] The above is only an embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent process transformation using the content of the present application specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A switching mode of plate cutting of a smart edgebanding saw, characterized in that, The method comprises the following steps: Detecting the length of the wood before the wood is transported to the visual scanning area; Setting a corresponding delay time according to the length of the wood; Timing starts after the wood is transported to the frontmost deviation roller in the visual scanning area, and the deviation roller stops the transportation after the delay time is reached; The visual recognition system collects the surface image of the wood in the detection area and extracts the inner contour curve of the wood in the image; Calculating the maximum cutting width between the two inner contour curves of the wood; Calculating the preset cutting line of the maximum cutting width between the two inner contour curves; According to the deviation distance between the preset cutting line and the actual cutting line, each deviation roller drives the wood to move the corresponding deviation distance; Fitting each of the two irregular inner contour curves through a certain number of points; Calculating the distance between the connecting lines of two points from the two inner contour curves respectively, and taking the connecting line with the shortest distance; Pre-setting two parallel preset cutting lines between the two inner contour curves, and the preset cutting line is perpendicular to the connecting line with the shortest distance; Extracting the intersection point of the rotation axis of each deviation roller and the preset cutting line, and calculating the deviation distance between the corresponding intersection point of each deviation roller and the actual cutting line. The deviation roller comprises an upper roller (71), a lower roller (72), a horizontal moving assembly (73) and an elastic member (74), the upper roller (71) is driven by the elastic member (74) to tend to approach the lower roller (72), and the horizontal moving assembly (73) pushes the upper roller (71) and the lower roller (72) to synchronously displace along the direction of the rotation axis thereof.

2. The switching mode of plate cutting of the intelligent edge trimming sawing machine according to claim 1, characterized in that: The distance between two adjacent points on the irregular inner contour curve is the same.

3. The switching mode of plate cutting of the intelligent edging saw machine according to claim 1, characterized in that: The visual recognition system calculates the inner contour curve of the wood through a deep learning algorithm.

4. The switching mode of plate cutting of the intelligent edging saw machine according to claim 1, characterized in that: The outer surface of the upper roller (71) and / or the lower roller (72) is provided with friction lines.

5. The switching mode of plate cutting of the intelligent edging saw machine according to claim 1, characterized in that: There is also a position sensor for monitoring the relative position between the upper roller (71) and the lower roller (72).

6. The switching mode of plate cutting of the intelligent edging saw machine according to claim 1, characterized in that: A sawing and conveying pressure roller group (2) is arranged between the deviation roller and the saw blade group (1).

7. The switching mode of plate cutting of the intelligent trimmer saw machine according to claim 1, characterized in that: The wood is transported to the visual scanning area by the feeding conveying pressure roller group (12), and a length measuring sensor (14) is installed at the feeding conveying pressure roller group (12).

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