A comb-type splicing machine for veneer length extension

Abstract

The present invention provides a comb-tooth type splicing machine for veneer splicing. The machine includes a veneer feeding device. The veneer is fed from the veneer feeding device to a laser cutting device. After the veneer positioning device detects that the veneer reaches the first process position, the texture of the veneer strip to be spliced is scanned by an AR scanning device, and the image data is transmitted to a data processing center. The calculation of the data processing center controls the laser cutting device to cut out comb-tooth type joints of the required shape according to the calculated route, and moves the front and rear veneers to the second process position. The comb-tooth type joints of the front and rear veneers are pressed and connected with tape through a tape pasting device. Finally, the veneer is discharged by a veneer discharging device. When longitudinally splicing precious broad-leaved wood veneer, the present invention ensures the stability of splicing accuracy and the continuous and beautiful texture of the veneer strip after splicing, has a wide adaptability, and has strong creativity.

Description

[0001] This application is a divisional application of a comb-type splicing machine for longitudinally joining ultra-wide veneer sheets, and the filing date of the original application document is December 21, 2018, the application number is 201811571733.5, and the invention title is a comb-type splicing machine for longitudinally joining ultra-wide veneer sheets. Technical Field

[0002] The present invention relates to the field of wood veneer splicing, and more particularly, to a comb-type splicing machine for veneer joining. Background Art

[0003] Currently, precious broad-leaved wood veneer sheets are often used as the surface veneer of artificial boards to improve the appearance quality of the artificial boards and ultimately increase the economic value of the finished boards. Different from rotary-cut veneers, veneer sheets can often obtain more beautiful wood textures, but at the same time, it is difficult to meet the requirements of the continuity and width of the obtained veneers. Therefore, in order to: ① make the veneer adapt to the size of the common artificial board width, ② make the discontinuous veneers into whole sheets to meet some technological requirements, ③ continuously join small-sized veneers to be able to roll them into veneer rolls for easy storage and transportation, a splicing machine is often used to join and widen small-sized veneer sheets first to improve their utilization value.

[0004] However, common longitudinal joining machines for veneer sheets in the industry mostly work by first using a mold to press out comb-type joints and then longitudinally splicing two veneers. This method has the following disadvantages: ① During continuous processing, the pressing mold is easily worn, which easily affects the splicing accuracy; ② The "mold pressing and cutting" process is greatly affected by the elastic-plastic deformation of wood, and it is difficult to maintain stable accuracy; ③ For veneer sheets with different textures, using the same mold to process comb-type joints, it is difficult to ensure the continuous beauty of the texture of the joined veneer belt, ultimately affecting the economic value of the decorative panel; ④ Limited by the processing accuracy of the mold and the physical and mechanical properties of wood, the splicing accuracy will drop significantly when the traditional splicing method is used for longitudinally joining thin veneers with ultra-wide transverse dimensions, and the adaptability is narrow. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a comb-type splicing machine for veneer joining, which solves the problems of unstable splicing accuracy, difficulty in ensuring the continuous beauty of the texture of the joined veneer belt, difficulty in longitudinally joining thin veneers with ultra-wide transverse dimensions, narrow adaptability, etc. when longitudinally joining wood veneer sheets, especially precious broad-leaved wood thin veneer sheets.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A comb-tooth splicing machine for veneer splicing includes a workbench, a veneer feeding device. The veneer is fed from the veneer feeding device to a laser cutting device. After the veneer positioning device detects that the veneer reaches the first process position, the texture of the veneer strip to be spliced is scanned by an AR scanning device, and the image data is transmitted to the data processing center. The calculation of the data processing center controls the laser cutting device to cut out comb-tooth joints of the required shape according to the calculated preset route. The front and rear veneers are moved to the second process position, and the comb-tooth joints of the front and rear veneers are pressed and connected with tape by a tape pasting device. Finally, the veneer is discharged by a veneer discharging device.

[0008] Preferably, the first process position is the laser cutting position, which is located at the position where the front end of the feeding veneer and the rear end of the previous veneer overlap according to the process setting, and is respectively set at the front end of the feeding veneer and the rear end of the previous veneer; the second process position is the sticker tape position, that is, the position where the two veneers to be spliced after laser cutting are synchronously moved backward to the position below the tape pasting head on the workbench.

[0009] Preferably, an upper cover plate is arranged on the upper part of the workbench through a cover plate fixing device, and a machine base and a workbench support are arranged below it; the workbench includes a front workbench, a rear workbench and a rear workbench groove.

[0010] Preferably, the front workbench is higher than the rear workbench; a layer of polytetrafluoroethylene film is attached to the surfaces of the front workbench and the rear workbench; there is a rear workbench groove on one side of the rear workbench close to the front workbench, and the bottom of the groove does not contact the rear workbench surface, and the bottom of the groove is made of high-temperature resistant ceramic material.

[0011] Preferably, a nitrogen circulation device is installed at the first process position of the rear workbench groove.

[0012] Preferably, the AR scanning device includes a camera, a data processing center and a display control screen;

[0013] The veneer feeding device includes a feeding roller pressing cylinder, a feeding roller lifting guide rod, a feeding power roller and a feeding servo motor;

[0014] The veneer discharging device includes: a discharging power roller, a discharging servo motor, a discharging roller lifting guide rod, a discharging roller pressing cylinder;

[0015] The tape pasting device includes a tape pasting head lifting cylinder, a tape pasting head lifting guide rod, a guide rod fixing bracket, a tape, a pressing plate, a tape reel bracket, a tape reel and a tape pasting head, and the lower surface of the pressing plate is made of soft rubber material.

[0016] Preferably, the laser cutting device includes an X guiding rod, an X slider, a Y lead screw, a Y nut, an X nut, an X servo motor, a Y servo motor, an X lead screw, a laser cutting head, a Y guiding rod, and a bracket; the laser cutting head is fixed on the Y nut, and the laser cutting head is controlled to move in two orthogonal directions by a cutting servo motor; the cutting servo motor is controlled to start, stop, and rotate speed by a computer in a data processing center.

[0017] Preferably, the single-board positioning device is provided with a set of sensors. When the front end of the feeding single board reaches the set process position, the sensor sends a signal to control the feeding servo motor to stop accurately, so that the feeding power roller stops rotating; when the rear end of the discharging single board reaches the set process position, the single-board positioning device sends a signal to control the discharging servo motor to stop accurately, so that the discharging power roller stops rotating.

[0018] Preferably, the surfaces of the feeding power roller and the discharging power roller are wrapped with a rubber layer with mesh grooves.

[0019] According to the above technical solutions, it can be known that a comb-tooth type splicing machine for single-board splicing length of the present invention solves the problems of unstable splicing accuracy, difficulty in ensuring the continuous and beautiful texture of the single-board strip after splicing, difficulty in longitudinally splicing thin single boards with an over-wide transverse dimension, and narrow adaptability when longitudinally splicing wood single boards, especially precious broad-leaved wood thin veneer thin single boards.

[0020] The present invention laser cuts the joint shapes of the front and rear two single boards at one time, avoiding processing errors caused by separately processing the front and rear joints; the laser cutting has high precision, and there is no influence of die precision and die wear on the splicing precision; the cutting has good flexibility, and different joint shapes can be designed according to different texture image data, meeting both process performance and aesthetic performance; it can be used for the longitudinal splicing of thin veneer thin single boards with an over-wide transverse dimension without affecting the splicing precision, the feeding and discharging are controlled more precisely, and the safety is higher, with strong creativity. Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 It is a three-dimensional structure schematic diagram of the present invention;

[0023] Figure 2 It is a principle structure diagram of the laser cutting device of the present invention;

[0024] Figure 3 The schematic structural diagram of the tape sticking device of the present invention;

[0025] Figure 4 The schematic diagram of the planar structural principle of the present invention;

[0026] Figure 5 The top view of the first process position of the present invention;

[0027] Figure 6 The processing principle diagram when the single board (i.e., the front and rear single boards) is in the first process position;

[0028] Figure 7 The processing principle diagram when the single board (i.e., the front and rear single boards) is in the second process position;

[0029] Among them, the marks in the drawings are as follows:

[0030] 1 - upper cover plate; 2 - front workbench; 3 - machine base; 4 - display control screen; 5 - workbench groove; 6 - single board positioning device; 7 - cover plate fixing device; 8 - discharge power roller; 9 - rear workbench; 10 - workbench support; 11 - discharge servo motor; 12 - discharge roller lifting guide rod; 13 - discharge roller pressing cylinder; 14 - tape sticking device; 15 - laser cutting device; 16 - camera; 17 - data processing center; 18 - feed roller pressing cylinder; 19 - feed roller lifting guide rod; 20 - feed power roller; 21 - X - guide rod; 22 - X - slider; 23 - Y - lead screw; 24 - Y - nut; 25 - X - nut; 26 - X - servo motor; 27 - Y - servo motor; 28 - X - lead screw; 29 - laser cutting head; 30 - Y - guide rod; 31 - bracket; 32 - tape sticking head lifting cylinder; 33 - tape sticking head lifting guide rod; 34 - guide rod fixing bracket; 35 - tape; 36 - pressing plate; 37 - tape reel bracket; 38 - tape reel; 39 - nitrogen circulation device; 40 - high - pressure air jet device; 41 - bin; A - the first process position; B - the second process position. Specific embodiments

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0032] Such as Figure 1 And Figure 4A comb-tooth type splicing machine for veneer lengthening as shown, includes a workbench, and a veneer feeding device. The veneer is fed from the veneer feeding device to a laser cutting device 15. After detecting that the veneer reaches the first process position A by using a veneer positioning device 6, the texture of the veneer strip to be spliced is scanned by an AR scanning device, and the image data is transmitted to a data processing center 17. The calculation of the data processing center 17 controls the laser cutting device 15 to cut out a comb-tooth type joint with the required shape according to the calculated route. The front and rear veneers are moved to the second process position B, and the comb-tooth type joints of the front and rear veneers are pressed and joined with a tape 35 by a tape sticking device 14. Finally, it is discharged by a veneer discharging device.

[0033] An upper cover plate 1 is arranged on the upper part of the workbench through a cover plate fixing device 7, and a machine base 3 and a workbench support 10 are arranged below it; the workbench includes a front workbench 2, a rear workbench 9 and a rear workbench groove 5.

[0034] Among them, the workbench includes a front workbench 2, a rear workbench 9 and a rear workbench groove 5; the AR scanning device includes a camera 16, a data processing center 17 and a display control screen 4; the feeding device includes a feeding roller pressing cylinder 18, a feeding roller lifting guide rod 19, a feeding power roller 20 and a feeding servo motor (not marked in the figure); the discharging device includes: a discharging power roller 8, a discharging servo motor 11, a discharging roller lifting guide rod 12, a discharging roller pressing cylinder 13; the tape sticking device 14 includes a tape sticking head lifting cylinder 32, a tape sticking head lifting guide rod 33, a guide rod fixing bracket 34, a tape 35, a pressing plate 36, a tape reel bracket 37, a tape reel 38 and a tape sticking head (not marked in the figure).

[0035] As Figure 5 shown, the first process position A is the laser cutting position, which is located at a position where there is a certain overlap between the front end of the feeding veneer and the rear end of the previous veneer according to the process setting, and is respectively set at the front end of the feeding veneer and the rear end of the previous veneer; the processing principle when the veneer (i.e., the front and rear veneers) is in the first process position is as Figure 6 shown. The second process position is the sticker tape position, that is, the position where the two veneers to be spliced after laser cutting are synchronously moved to the position below the tape sticking head on the rear workbench. The processing principle when the veneer is in the second process position B is as Figure 7 shown.

[0036] Among them, one end of the veneer pointing in the positive direction of its feeding is the front end of the veneer, and one end pointing in the negative direction of its feeding is the rear end of the veneer.

[0037] As Figure 2The shown laser cutting device 15 includes an X guiding rod 21, an X slider 22, a Y lead screw 23, a Y nut 24, an X nut 25, an X servo motor 26, a Y servo motor 27, an X lead screw 28, a laser cutting head 29, a Y guiding rod 30 and a bracket 31. Among them, the laser cutting head 29 is fixed on the Y nut 24 to emit laser for cutting a single board; two sets of lead screw nut mechanisms are respectively controlled by two cutting servo motors, and respectively control the movement of the laser cutting head 29 in two orthogonal directions; the two cutting servo motors are controlled by a computer of the data processing center 17 for starting, stopping and rotation speed.

[0038] The above-mentioned laser cuts out the joint shapes of the front and rear single boards at one time, avoiding machining errors caused by separate machining of the front and rear joints; the laser cutting has high precision, and there is no influence of die precision and die wear on the splicing precision; the cutting flexibility is good, and different joint shapes can be designed according to different texture image data, meeting both process performance and aesthetic performance; it can be used for the longitudinal splicing of thin veneer with an ultra-wide transverse dimension without affecting the splicing precision.

[0039] When the front and rear single boards reach the first process position A, the AR scanning device works, the camera 16 takes pictures of the texture pattern of the single board strip to be spliced, and the image acquisition card transmits the image data to the data processing center 17. The computer of the data processing center 17 calculates the best comb-shaped cutting shape that meets the processability and aesthetic property according to the received image data, and controls the laser cutting device to cut out the comb-shaped joint of the required shape according to the calculated preset route.

[0040] This design has good cutting flexibility, and different joint shapes can be designed according to different texture image data, meeting both process performance and aesthetic performance.

[0041] The front workbench 2 is 1 mm higher than the rear workbench 9. When the feeding single board feeds from the higher front workbench 2, the front section of the single board is on the lower rear workbench 9, so that when the feeding single board reaches the first process position, its front end naturally overlaps partially with the rear end of the previous single board, enabling the laser cutting device to cut out the joint shapes of the front and rear single boards at one time, avoiding machining errors caused by separate machining of the front and rear joints.

[0042] A layer of polytetrafluoroethylene film is attached to the surfaces of the front and rear workbenches. This design improves the smoothness of the workbench surface, prevents the feeding power roller 20 and the discharging power roller 8 from slipping; reduces the wear of the veneer by the workbench surface; and improves the wear resistance of the workbench surface.

[0043] The rear workbench 9 has a rectangular groove 5 on the side close to the front workbench 2. The bottom of the groove is 10 cm away from the surface of the rear workbench 9, and the bottom of the groove is made of high-temperature resistant ceramic material. In this design, the front end of the feeding single board overlaps with the rear end of the previous single board above the groove 5, and the laser cutter cuts at the overlapping part, so that the waste cut from the previous single board naturally falls into the groove 5; the ceramic bottom of the groove is resistant to the high temperature of the laser ray and prevents being penetrated by the laser.

[0044] Such as Figure 3 The tape sticking device 14 shown in the figure includes a tape sticking head lifting cylinder 32, a tape sticking head lifting guide rod 33, a guide rod fixing bracket 34, a tape 35, a pressing plate 36, a tape reel bracket 37, a tape reel 38, and a tape sticking head (not marked in the figure).

[0045] The working principle of this structure is: when the front and rear single boards move to the second process position, the cylinder presses down, and the pressing plate presses the comb-shaped joint processed by the front and rear single boards, the tape sticking head sticks the tape at the joint, and after sticking, the tape is cut off, and the cylinder lifts up.

[0046] The lower surface of the pressing plate 36 is made of soft rubber material. This design avoids rigid contact between the lower surface of the pressing plate and the surface of the single board belt, avoids crushing and damaging the single board; avoids uneven force application of the pressing plate to the ultra-wide single board.

[0047] The single board positioning device 6 includes a set of sensors; when the front end of the feeding single board reaches the set process position, the sensor sends a signal to control the feeding servo motor to stop precisely, so that the feeding power roller 20 stops rotating; when the rear end of the discharging single board reaches the set process position, the single board positioning device 6 sends a signal to control the discharging servo motor to stop precisely, so that the discharging power roller 8 stops rotating. This design enables the front and rear single boards to stop precisely at the set process positions.

[0048] The surfaces of the feeding power roller 20 and the discharging power roller 8 are wrapped with a rubber layer with mesh grooves. This design avoids rigid contact between the roller and the surface of the single board belt, avoids crushing and damaging the single board; improves the contact friction between the roller surface and the single board belt surface, enables more precise control of the feeding and discharging of the single board, and enables the single board belt to stop precisely synchronously with the power roller.

[0049] At the first process position A, that is, at the groove 5 of the rear workbench, a nitrogen circulation device 39 is installed. This design of nitrogen cutting can prevent wood carbonization caused by laser high temperature; the nitrogen circulation device 39 enables nitrogen to be recycled and reduces production costs.

[0050] The chip removal device includes a high-pressure nitrogen gas flow jetting device 40, a dust suction filter, and a bin 41. The high-pressure nitrogen gas flow jetting device 40 is installed on one side of the recess 5 of the rear workbench, and the bin 41 is on the other side. The high-pressure nitrogen gas flow of this design blows the chips separated after cutting into the bin 41 under the workbench. After being purified by the dust suction filter, it is ejected again by the high-pressure nitrogen gas flow jetting device 40 through the nitrogen gas circulation device 39

[0051] In summary, the comb-tooth type splicing machine of the present invention solves the problems of unstable splicing accuracy, difficulty in ensuring the continuous and beautiful texture of the veneer strip after splicing, difficulty in longitudinally splicing thin veneers with an over-wide transverse dimension, and narrow adaptability when longitudinally splicing wood veneers, especially precious broad-leaved wood thin veneers

[0052] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein

Claims

1. A comb-tooth type splicing machine for veneer splicing, comprising a workbench, characterized in that, It includes a veneer feeding device. The veneer is fed by the veneer feeding device to the laser cutting device (15). After the veneer positioning device (6) detects that the veneer reaches the first process position (A), the texture of the veneer strip to be spliced is scanned by the AR scanning device, and the image data is transmitted to the data processing center (17). The calculation of the data processing center (17) controls the laser cutting device (15) to cut out the comb-shaped joints of the required shape according to the calculated route, moves the front and rear veneers to the second process position (B), presses and connects the comb-shaped joints of the front and rear veneers with the tape (35) through the tape sticking device (14), and finally discharges the veneer through the veneer discharging device; The first process position (A) is the laser cutting position, which is located at the position where the front end of the feeding veneer and the rear end of the previous veneer are overlapped according to the process setting, and are respectively set at the front end of the feeding veneer and the rear end of the previous veneer; the second process position (B) is the sticker tape position, and the sticker tape position is the position where the two veneers to be spliced after laser cutting are synchronously moved backward to the lower part of the tape sticking head on the workbench; The laser cutting device (15) includes an X guide rod (21), an X slider (22), a Y lead screw (23), a Y nut (24), an X nut (25), an X servo motor (26), a Y servo motor (27), an X lead screw (28), a laser cutting head (29), a Y guide rod (30) and a bracket (31); the laser cutting head (29) is fixed on the Y nut (24), and the laser cutting head (29) moves in two orthogonal directions under the control of the cutting servo motor; the cutting servo motor is controlled by the computer of the data processing center (17) to start, stop and rotate speed; The upper part of the workbench is provided with an upper cover plate (1) through the cover plate fixing device (7), and a machine base (3) and a workbench support (10) are arranged below it; the workbench includes a front workbench (2), a rear workbench (9) and a rear workbench groove (5); The front workbench (2) is higher than the rear workbench (9); a layer of polytetrafluoroethylene film is attached to the surfaces of the front workbench (2) and the rear workbench (9); the rear workbench (9) has a rear workbench groove (5) on the side close to the front workbench (2), and the bottom of the groove is not in contact with the surface of the rear workbench (9), and the bottom of the groove is made of high-temperature resistant ceramic material; The front workbench (2) is 1 mm higher than the rear workbench (9); when the feeding veneer is fed from the higher front workbench (2), the previous veneer is on the lower rear workbench (9), so that when the feeding veneer reaches the first process position (A), its front end and the rear end of the previous veneer naturally produce partial overlap, enabling the laser cutting device to cut out the joint shapes of the front and rear two veneers at one time.

2. The comb-type splicing machine for veneer elongation according to claim 1, characterized in that A nitrogen circulation device (39) is installed at the first process position (A) of the rear workbench groove (5).

3. The comb-tooth type splicing machine for veneer splicing according to claim 1, characterized in that, The bottom of the groove is 10 cm away from the surface of the rear workbench (9). The front end of the feeding veneer and the rear end of the previous veneer overlap above the groove (5), and the laser cutting device cuts at the overlapping part, so that the waste cut from the previous veneer naturally falls into the groove (5).

4. A comb-type splicing machine for splicing single boards according to claim 1, characterized in that, The AR scanning device includes a camera (16), a data processing center (17), and a display control screen (4); The single-board feeding device includes a feeding roller pressing cylinder (18), a feeding roller lifting guide rod (19), a feeding power roller (20), and a feeding servo motor; The single-board discharging device includes a discharging power roller (8), a discharging servo motor (11), a discharging roller lifting guide rod (12), and a discharging roller pressing cylinder (13); The tape sticking device (14) includes a tape sticking head lifting cylinder (32), a tape sticking head lifting guide rod (33), a guide rod fixing bracket (34), a tape (35), a pressing plate (36), a tape reel bracket (37), a tape reel (38), and a tape sticking head. The lower surface of the pressing plate (36) is made of soft rubber material.

5. A comb-tooth type splicing machine for veneer splicing according to claim 1, characterized in that, The single-board positioning device (6) is provided with a set of sensors. When the front end of the feeding single board reaches the set process position, the sensor sends a signal to control the feeding servo motor to accurately stop, so that the feeding power roller (20) stops rotating; when the rear end of the discharging single board reaches the set process position, the single-board positioning device (6) sends a signal to control the discharging servo motor to accurately stop, so that the discharging power roller (8) stops rotating.

6. A comb-type splicing machine for veneer elongation according to claim 4, characterized in that, The surfaces of the feeding power roller (20) and the discharging power roller (8) are wrapped with a rubber layer with mesh grooves.

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