A stacking positioning machine and positioning method for melamine impregnated paper veneer panels

Abstract

This invention relates to a melamine-impregnated paper-faced sheet stacking and positioning machine and method, comprising a belt conveyor, a longitudinal positioning reference component, a transverse positioning reference component, a transverse alignment component, and a photoelectric switch component. The belt conveyor is equipped with four narrow flat belts, with the driving pulley at the front and the driven pulley at the rear. The operating speed is adjustable, and the narrow flat belts have a small contact area with the melamine-faced sheet, resulting in low frictional resistance. The longitudinal positioning reference component is located at the rear and works with the belt conveyor to achieve longitudinal positioning of the sheet. The transverse positioning reference component is located on the left side, and three transverse alignment components work with the transverse positioning reference component to achieve transverse positioning of the sheet. Three photoelectric switches are used to sense the position of the front end of the sheet during longitudinal feeding, sending signals to control the belt's fast / slow speed and the movement of the transverse alignment components. This achieves automatic and precise positioning of the melamine-faced sheet before automatic stacking, effectively preventing scratches on the surface of the melamine-faced sheet.

Description

Technical Field

[0001] The invention belongs to the field of wood processing, and relates to artificial board veneer processing technology and equipment, in particular to a melamine impregnated paper veneer board stacking positioning machine and positioning method. Background Art

[0002] The surface of wood-based panels needs to be finished before they can be used. Veneer processing is one of the main ways of finishing wood-based panels. Veneer wood-based panels are veneer panels that are made of melamine-impregnated paper, PVC film, sliced ​​veneer and other veneer materials that are attached to the surface of wood-based panels by hot pressing.

[0003] Melamine impregnated paper veneer panels have the advantages of clear and realistic patterns, stain resistance, heat resistance, wear resistance, UV resistance, fading resistance, green environmental protection, and high bonding strength. They can be used in the manufacture of furniture, flooring and other products, as well as interior decoration.

[0004] The production process of melamine impregnated paper veneer sheets mainly includes assembly, loading, hot pressing, unloading, trimming, cooling, stacking, etc. In order to improve production efficiency and reduce labor, the production process is required to be automated, and at the same time, it is required that the veneered sheets should avoid scratches on the surface during unloading, trimming, cooling and stacking.

[0005] For ordinary boards, when stacking, the boards are first transported one by one to the lifting platform through belts or rollers for stacking. After each board is transported, the boards are slid and aligned by beating in both directions. During the alignment process, there is relative sliding friction between the boards. However, for melamine impregnated paper veneer boards, if there is sliding friction between the board surfaces, scratches are easily generated, and the boards become waste. Therefore, the stacking method of ordinary boards is not suitable for melamine impregnated paper veneer boards.

[0006] When producing melamine impregnated paper veneer sheets, in order to avoid sliding friction between veneer sheets during the stacking process, the stacking of veneer sheets is usually carried out by vacuum adsorption. The cooled melamine impregnated paper veneer sheets are sucked, lifted, translated, and stacked to the specified position from the belt conveyor line by a CNC vacuum translation machine or a four-axis manipulator. In order to stack the sheets neatly, the melamine impregnated paper veneer sheets need to be automatically positioned in both directions before the CNC vacuum translation machine or the four-axis manipulator sucks the sheets. For this purpose, it is necessary to design a melamine impregnated paper veneer sheet stacking positioning machine. Summary of the invention

[0007] In order to solve the problem of automatic bidirectional positioning of melamine impregnated paper veneer panels before vacuum adsorption stacking, the present invention provides a melamine impregnated paper veneer panel stacking positioning machine and positioning method.

[0008] The technical solution adopted by the present invention to solve the technical problem is:

[0009] A melamine impregnated paper veneer board stacking and positioning machine, comprising a belt conveyor 1, a longitudinal positioning reference component 2, a transverse positioning reference component 3, a transverse alignment component 4, and a photoelectric switch component 5;

[0010] The belt conveyor 1 comprises a narrow flat belt group 11, a driving pulley shaft assembly 12, a driven tensioning pulley assembly 13, an upper idler group 14, an upper pressure roller group 15, a lower idler group 16, a front guide roller 17, a rear guide roller 18, a lower pressure roller 19, a variable frequency speed regulating motor drive unit 110, a multi-V belt 111, a safety cover 112, and a frame 113;

[0011] The narrow flat belt group 11 has a total of 4 narrow flat belts, which are arranged perpendicular to the sheet feeding direction. The spacing between two adjacent narrow flat belts is equal, and the contact area between the veneer sheet and the narrow flat belts is small, which is conducive to reducing the sliding friction resistance between the veneer sheet and the narrow flat belts when the veneer sheet is positioned and slid;

[0012] The driving pulley shaft assembly 12 is located at the rear end of the belt conveyor 1, and includes a driving shaft 121, four driving pulleys 122, two supporting wheels 123, three bearing seats 124, and a driven multi-V belt pulley 125; the driving pulley 122, the supporting wheel 123 and the driven multi-V belt pulley 125 are fixedly connected to the driving shaft 121 through a key; the driving shaft 121 is installed on the frame 113 through three bearing seats 124, and a bearing seat 124 is arranged at each end and the middle position of the driving shaft 121 to increase the rigidity of the driving shaft 121 and avoid bending due to the tension of the narrow flat belt; the two supporting wheels 123 are arranged at the two ends of the driving shaft 121, respectively, to support the two side edges of the veneer sheet material to prevent the two side edges of the veneer sheet material from sagging and deformation; along the feeding direction of the veneer sheet material, the driven multi-V belt pulley 125 is located at the left end of the driving shaft 121;

[0013] The driven tensioning pulley assembly 13 is located at the front end of the belt conveyor 1, and includes a driven pulley 131, a screw bearing seat 132, a nut 133, a guide support plate 134, and a driven pulley bracket 135; the driven pulley bracket 135 is installed on the frame 113; there are 4 driven pulleys 131, each driven pulley 131 is supported on the driven pulley bracket 135 by two screw bearing seats 132, and the position of the driven pulley 131 can be adjusted by adjusting the nut 133 to achieve the purpose of tensioning or loosening the narrow flat belt; the tension of each narrow flat belt can be adjusted separately to ensure that the tension of the 4 narrow flat belts is as consistent as possible; a guide support plate 134 is provided at both ends of the driven pulley bracket 135 to support and guide the front lower surface of the veneer sheet to prevent collision or jamming;

[0014] The upper roller group 14 has 11 upper rollers in total. The upper rollers are hollow structures. Rolling bearings are installed inside the two ends of the upper rollers, and the middle shaft does not rotate. The shafts at both ends of the upper rollers are installed on the 113 frame through supports, and are evenly arranged along the feeding direction of the veneer sheet material. The installation height is the same, supporting the narrow flat belt group 11 and the veneer sheet material.

[0015] The upper pressing roller group 15 has a total of 3 upper pressing rollers. Looking along the feeding direction of the veneer sheet material, the 3 upper pressing rollers are respectively arranged between the third upper roller and the fourth upper roller, between the seventh upper roller and the eighth upper roller, and between the ninth upper roller and the tenth upper roller of the upper roller group 14, so as to press the upper edge of the narrow flat belt downward for a distance to increase the wrap angle between the narrow flat belt and the two upper rollers adjacent to the upper pressing roller, and also make the narrow flat belt fit closely with the other upper rollers, so that all the upper rollers can rotate smoothly;

[0016] The structure of the upper pressure roller is the same as that of the upper support roller, and the shafts at both ends of the upper pressure roller are mounted on the frame 113 through supports;

[0017] The diameter of the upper pressure roller is smaller than that of the upper support roller. The three upper pressure rollers divide the upper edge of the narrow flat belt into four front and rear areas. The two areas near the rear end of the belt conveyor 1 are smaller. When the veneer sheet with a smaller length dimension is positioned laterally, the narrow flat belt can be prevented from being laterally offset.

[0018] The front guide roller 17 is arranged at the front end of the belt conveyor 1, and is located below the driven tension pulley assembly 13 and slightly inside. The rear guide roller 18 is arranged at the rear end of the belt conveyor 1, and is located below the driving pulley shaft assembly 12 and slightly inside. The lower roller group 16 includes two lower rollers, which are arranged between the front guide roller 17 and the rear guide roller 18. The structure and size of the lower rollers are the same as those of the upper rollers.

[0019] The lower pressure roller 19 is arranged between the driving pulley shaft assembly 12 and the eleventh upper pressure roller of the upper roller group 14, and the lower pressure roller 19 is installed on the frame 113, and presses the lower edge of the narrow flat belt between the driving pulley shaft assembly 12 and the rear guide roller 18 upward to increase the wrap angle of the narrow flat belt on the driving pulley 122, thereby improving the friction driving force of the narrow flat belt;

[0020] The structure and size of the lower pressing roller 19 are the same as those of the upper pressing roller;

[0021] The variable frequency speed regulating motor drive unit 110 is installed on the frame 113. A driving multi-V belt pulley is installed on the shaft of the variable frequency speed regulating motor drive unit 110. The multi-V belt 111 and the driven multi-V belt pulley 125 on the driving pulley shaft assembly 12 form a multi-V belt transmission pair, which drives the driving shaft 121 and the driving pulley 122 to rotate, so that the narrow flat belt group 11 runs, and the running can be steplessly adjusted; a safety cover 112 is arranged on the outer side of the multi-V belt transmission pair, and the safety cover 112 is fixed on the frame 113;

[0022] The frame 113 is welded by rectangular steel pipes and steel plates, and is used to install the belt conveyor 1, the longitudinal positioning reference component 2, the transverse positioning reference component 3, the transverse alignment component 4, and the photoelectric switch component 5.

[0023] Looking along the feeding direction of the veneer sheet material, the longitudinal positioning reference assembly 2 is arranged at the rear end of the belt conveyor 1, and includes a longitudinal positioning reference plate 21, three vertical brackets C22, and three bolts D23; the longitudinal positioning reference plate 21 is perpendicular to the feeding direction of the veneer sheet material; the longitudinal positioning reference plate 21 is installed on the vertical bracket C22 by means of bolts D23, and the vertical bracket C22 is fixed on the frame 113;

[0024] The longitudinal positioning reference assembly 2 cooperates with the belt conveyor 1 to complete the longitudinal positioning of the front end of the veneer sheet material.

[0025] Looking along the feeding direction of the veneer sheet material, the transverse positioning reference assembly 3 is arranged on the left side of the belt conveyor 1, and includes a transverse positioning reference plate 31, three vertical brackets E32, and three bolts F33; the transverse positioning reference plate 31 is parallel to the longitudinal feeding direction of the veneer sheet material; the transverse positioning reference plate 31 is installed on the vertical bracket E32 by bolts F33, and the vertical bracket E32 is fixed on the frame 113;

[0026] A series of semicircular grooves are formed at the lower part of the transverse positioning reference plate 31. The positions of the semicircular grooves match the positions of the upper roller, the upper pressure roller and the lower pressure roller. The radius of the semicircular grooves is slightly larger than the radius of the upper roller, so as to ensure that the side of the veneer sheet is in full contact with the transverse positioning reference plate 31 when the veneer sheet is positioned transversely.

[0027] The front end of the transverse positioning reference plate 31 has a small section bent to the left outside at a certain angle, which can guide the veneer material when it is fed longitudinally to prevent collision and jamming.

[0028] There are three groups of transverse alignment components 4, which are used to pull the veneer sheet toward the transverse positioning reference plate 31 to achieve transverse positioning of the veneer sheet; the transverse alignment components 4 are installed on the frame 113, and along the longitudinal feeding direction of the veneer sheet, the first group of transverse alignment components is located between the second upper roller and the third upper roller of the upper roller group 14, the second group of transverse alignment components is located between the sixth upper roller and the seventh upper roller of the upper roller group 14, and the third group of transverse alignment components is located between the tenth upper roller and the eleventh upper roller of the upper roller group 14;

[0029] Each set of transverse alignment components 4 includes a cylinder 41, an ear seat 42, a cylindrical guide rod 43, two guide rod slides 44, a guide rod protection cover 45, a block 46, a block slide 47, a block guide rail 48, and a transverse bracket 49. When viewed along the feeding direction of the veneer sheet material, the cylinder 41 is located on the left side, and the block 46 is located on the right side. The cylinder 41 adopts a single piston rod structure, and the rear end of the cylinder barrel of the cylinder 41 is installed on the transverse bracket 49 through the ear seat 42. The piston rod is connected to one end of the cylindrical guide rod 43, the other end of the cylindrical guide rod 43 is connected to the block slide 44, and the block guide rail 48 is fixed on the transverse bracket 49; the block 46 is a cylinder and is vertically fixed on the block slide 47; the block guide rail 48 has a rectangular cross section and cooperates with the block slide 47 to prevent the block 46 from deflecting and tilting; the upper surface of the block slide 47 and the upper surface of the guide rod protection cover 45 are slightly lower than the upper generatrix of the upper roller;

[0030] When compressed air is introduced into the rodless chamber of the cylinder 41, the piston rod extends, and the stopper 46 moves to the right side of the longitudinal feeding direction of the veneer sheet to the extreme position, away from the veneer sheet, so as to facilitate the unobstructed longitudinal feeding of the veneer sheet; when the front end of the veneer sheet contacts the longitudinal positioning reference plate 21, the narrow flat belt group 11 stops moving; compressed air is introduced into the rod chamber of the cylinder 41, and the stopper 46 moves to the left side of the longitudinal feeding direction of the veneer sheet, touches the right side surface of the veneer sheet, and pulls the veneer sheet to the left side, so that the left side surface of the veneer sheet contacts the transverse positioning reference plate 31, thereby realizing the transverse positioning of the veneer sheet; after the transverse positioning of the veneer sheet is completed, compressed air is introduced into the rodless chamber of the cylinder 41 again, the piston rod extends, and the stopper 46 returns to the right extreme position, waiting for the transverse positioning of the next veneer sheet.

[0031] The photoelectric switch assembly 5 includes a photoelectric switch H51, a switch bracket J52, a photoelectric switch K53, a switch bracket L54, a photoelectric switch M55, and a switch bracket N56; the photoelectric switch H51, the photoelectric switch K53, and the photoelectric switch M55 are respectively installed on the frame 113 through the switch bracket J52, the switch bracket L54, and the switch bracket N56, and are located in a straight line. The installation height is slightly lower than the upper busbar of the upper roller, and does not affect the movement of the veneer sheet; along the feeding direction of the veneer sheet, the photoelectric switch H51 is located at the axial position of the driven pulley 131, the photoelectric switch K53 is located between the fifth upper roller and the sixth upper roller of the upper roller group 14, and the photoelectric switch M55 is located between the eleventh upper roller of the upper roller group 14 and the longitudinal positioning reference plate 21.

[0032] A positioning method for a melamine impregnated paper veneer board stacking positioning machine comprises the following steps:

[0033] Step 1: After the melamine impregnated paper veneer sheet is cooled, it is transported to the front end of the belt conveyor 1 by the front roller conveyor or belt conveyor. When the photoelectric switch H51 senses the front end of the veneer sheet, it sends a signal to start the variable frequency speed regulating motor drive unit 110, driving the narrow flat belt group 11 to run quickly, and the veneer sheet is quickly fed longitudinally;

[0034] Step 2, when the photoelectric switch K53 senses the front end of the veneer sheet, it sends a signal to decelerate the variable frequency speed regulating motor drive unit 110, drive the narrow flat belt group 11 to run slowly, and feed the veneer sheet slowly longitudinally to prevent the front end of the veneer sheet from impacting the longitudinal positioning reference plate 21;

[0035] Step 3, when the photoelectric switch M55 senses the front end of the veneer sheet, it sends a signal to delay the control of the variable frequency speed regulating motor drive unit 110 to stop, so that the narrow flat belt group 11 continues to run for a short period of time, ensuring that the front end of the veneer sheet is close to the longitudinal positioning reference plate 21, so as to achieve precise longitudinal positioning of the veneer sheet;

[0036] Step 4, when the photoelectric switch M55 senses the front end of the veneer sheet, it also sends a signal to control the three groups of lateral alignment components 4 to act synchronously, and the rod chamber of the cylinder 41 is passed with compressed air, so that the stopper 46 moves to the left side of the veneer sheet feeding direction, and pulls the veneer sheet to move to the left side, so that the left side of the veneer sheet is close to the lateral positioning reference plate 31, so as to realize the lateral precise positioning of the veneer sheet;

[0037] Step 5: After the veneer sheet is transversely positioned, the cylinder 41 of the transverse alignment assembly 4 moves in the opposite direction, and the stopper 46 moves to the right side of the longitudinal feeding direction of the veneer sheet, waiting for the transverse positioning of the next veneer sheet;

[0038] Step 6: After the veneer sheet is positioned longitudinally and transversely, it is sucked away by the rear CNC vacuum translation machine or four-axis robot and the stack is removed, and then steps 1 to 5 are repeated.

[0039] The present invention has the following advantages:

[0040] (1) The automation level of the melamine impregnated paper veneer production line has been improved, laying the foundation for intelligent manufacturing.

[0041] (2) It can effectively prevent scratches on the surface of the melamine impregnated paper veneer board during the stacking process, ensuring that the quality of the veneer board is not affected.

[0042] (3) The veneer sheets are precisely positioned, ensuring that the edges of the stacks are flush after the veneer sheets are stacked using a CNC vacuum translation machine or a four-axis manipulator, making it easier to package and transport the veneer sheets. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 A structural diagram of a melamine impregnated paper veneer board stacking and positioning machine.

[0044] Figure 2 A structural diagram of the belt conveyor of the present invention.

[0045] Figure 3 Belt transmission component diagram of the belt conveyor of the present invention.

[0046] Figure 4 A diagram of the driving pulley shaft assembly of the belt conveyor of the present invention.

[0047] Figure 5 A diagram of a driven tensioning pulley assembly of a belt conveyor of the present invention.

[0048] Figure 6 A structural diagram of the frame of the belt conveyor assembly of the present invention.

[0049] Figure 7 Installation diagram of the longitudinal positioning reference assembly and the transverse positioning reference assembly of the present invention on a frame.

[0050] Figure 8 Layout and installation diagram of the lateral alignment assembly of the present invention on a frame.

[0051] Fig. 9 Structural diagram of the lateral alignment assembly of the present invention.

[0052] Fig.10 The layout and installation diagram of the photoelectric switch assembly of the present invention on the rack.

[0053] exist Figures 1 to 10 middle:

[0054] 1-belt transport device, 11-narrow flat belt group, 12-driving pulley shaft assembly, 13-driven tensioning pulley assembly, 14-upper roller group, 15-upper pressure roller group, 16-lower roller group, 17-front guide roller, 18-rear guide roller, 19-lower pressure roller, 110-frequency control motor drive unit, 111-multi-V belt, 112-safety cover, 113-frame;

[0055] 121-driving shaft, 122-driving pulley, 123-supporting pulley, 124-bearing seat, 125-driven multi-V belt pulley;

[0056] 131-driven pulley, 132-screw bearing seat, 133-nut, 134-guide support plate, 135-driven pulley bracket;

[0057] 2-longitudinal positioning reference assembly, 21-longitudinal positioning reference plate, 22-vertical bracket C, 23-bolt D;

[0058] 3-lateral positioning reference assembly, 31-lateral positioning reference plate, 32-vertical bracket E, 33-bolt F;

[0059] 4-lateral alignment assembly, 41-cylinder, 42-ear seat, 43-cylindrical guide rod, 44-guide rod slide, 45-guide rod protection cover, 46-stopper, 47-stopper slide, 48-stopper guide rail, 49-lateral bracket;

[0060] 5-photoelectric switch assembly, 51-photoelectric switch H, 52-switch bracket J, 53-photoelectric switch K, 54-switch bracket L, 55-photoelectric switch M, 56-switch bracket N. DETAILED DESCRIPTION

[0061] The following is combined with Figure 1 To Attachment Fig.10 , clearly and completely describe the technical solutions in the embodiments of the present invention.

[0062] A melamine impregnated paper veneer board stacking and positioning machine, comprising a belt conveyor 1, a longitudinal positioning reference component 2, a transverse positioning reference component 3, a transverse alignment component 4, and a photoelectric switch component 5;

[0063] The belt conveyor 1 comprises a narrow flat belt group 11, a driving pulley shaft assembly 12, a driven tensioning pulley assembly 13, an upper idler group 14, an upper pressure roller group 15, a lower idler group 16, a front guide roller 17, a rear guide roller 18, a lower pressure roller 19, a variable frequency speed regulating motor drive unit 110, a multi-V belt 111, a safety cover 112, and a frame 113;

[0064] The narrow flat belt group 11 has a total of 4 narrow flat belts, which are arranged perpendicular to the sheet feeding direction. The spacing between two adjacent narrow flat belts is equal, and the contact area between the veneer sheet and the narrow flat belts is small, which is conducive to reducing the sliding friction resistance between the veneer sheet and the narrow flat belts when the veneer sheet is positioned and slid;

[0065] The driving pulley shaft assembly 12 is located at the rear end of the belt conveyor 1, and includes a driving shaft 121, four driving pulleys 122, two supporting wheels 123, three bearing seats 124, and a driven multi-V belt pulley 125; the driving pulley 122, the supporting wheel 123 and the driven multi-V belt pulley 125 are fixedly connected to the driving shaft 121 through a key; the driving shaft 121 is installed on the frame 113 through three bearing seats 124, and a bearing seat 124 is arranged at each of the two ends and the middle position of the driving shaft 121 to enhance the rigidity of the driving shaft 124 and avoid bending due to the tension of the narrow flat belt; the two supporting wheels 123 are respectively arranged at the two ends of the driving shaft 121 to support the two side edges of the veneer sheet material to prevent the two side edges of the veneer sheet material from sagging and deformation; along the feeding direction of the veneer sheet material, the driven multi-V belt pulley 125 is located at the left end of the driving shaft 121;

[0066] The driven tensioning pulley assembly 13 is located at the front end of the belt conveyor 1, and includes a driven pulley 131, a screw bearing seat 132, a nut 133, a guide support plate 134, and a driven pulley bracket 135; the driven pulley bracket 135 is installed on the frame 113; there are 4 driven pulleys 131, each driven pulley 131 is supported on the driven pulley bracket 135 by two screw bearing seats 132, and the position of the driven pulley 131 can be adjusted by adjusting the nut 133 to achieve the purpose of tensioning or loosening the narrow flat belt; the tension of each narrow flat belt can be adjusted separately to ensure that the tension of the 4 narrow flat belts is as consistent as possible; a guide support plate 134 is provided at both ends of the driven pulley bracket 135 to support and guide the front lower surface of the veneer sheet to prevent collision or jamming;

[0067] The upper roller group 14 has 11 upper rollers in total. The upper rollers are hollow structures. Rolling bearings are installed inside the two ends of the upper rollers. The middle shaft does not rotate. The shafts at both ends of the upper rollers are installed on the frame 113 through supports. They are evenly arranged along the feeding direction of the veneer sheet material and have the same installation height to support the narrow flat belt group 11 and the veneer sheet material.

[0068] The upper pressing roller group 15 has a total of 3 upper pressing rollers. Looking along the feeding direction of the veneer sheet material, the 3 upper pressing rollers are respectively arranged between the third upper roller and the fourth upper roller, between the seventh upper roller and the eighth upper roller, and between the ninth upper roller and the tenth upper roller of the upper roller group 14, so as to press the upper edge of the narrow flat belt downward for a distance to increase the wrap angle between the narrow flat belt and the two upper rollers adjacent to the upper pressing roller, and also make the narrow flat belt fit closely with the other upper rollers, so that all the upper rollers can rotate smoothly;

[0069] The structure of the upper pressure roller is the same as that of the upper support roller, and the shafts at both ends of the upper support roller are mounted on the frame 113 through supports;

[0070] The diameter of the upper pressure roller is smaller than that of the upper support roller. The three upper pressure rollers divide the upper edge of the narrow flat belt into four front and rear areas. The two areas near the rear end of the belt conveyor 1 are smaller. When the veneer sheet with a smaller length dimension is positioned laterally, the narrow flat belt can be prevented from being laterally offset.

[0071] The front guide roller 17 is arranged at the front end of the belt conveyor 1, and is located below the driven tension pulley assembly 13 and slightly inside. The rear guide roller 18 is arranged at the rear end of the belt conveyor 1, and is located below the driving pulley shaft assembly 12 and slightly inside. The lower roller group 16 includes two lower rollers, which are arranged between the front guide roller 17 and the rear guide roller 18. The structure and size of the lower rollers are the same as those of the upper rollers.

[0072] The lower pressure roller 19 is arranged between the driving pulley shaft assembly 12 and the eleventh upper pressure roller of the upper roller group 14, and the lower pressure roller 19 is installed on the frame 113, and presses the lower edge of the narrow flat belt between the driving pulley shaft assembly 12 and the rear guide roller 18 upward to increase the wrap angle of the narrow flat belt on the driving pulley 122, thereby improving the friction driving force of the narrow flat belt;

[0073] The structure and size of the lower pressing roller 19 are the same as those of the upper pressing roller;

[0074] The variable frequency speed regulating motor drive unit 110 is installed on the frame 113. A driving multi-V belt pulley is installed on the shaft of the variable frequency speed regulating motor drive unit 110. The multi-V belt 111 and the driven multi-V belt pulley 125 on the driving pulley shaft assembly 12 form a multi-V belt transmission pair, which drives the driving shaft 121 and the driving pulley 122 to rotate, so that the narrow flat belt group 11 runs, and the running can be steplessly adjusted; a safety cover 112 is arranged on the outer side of the multi-V belt transmission pair, and the safety cover 112 is fixed on the frame 113;

[0075] The frame 113 is welded by rectangular steel pipes and steel plates, and is used to install the belt conveyor 1, the longitudinal positioning reference component 2, the transverse positioning reference component 3, the transverse alignment component 4, and the photoelectric switch component 5.

[0076] Looking along the feeding direction of the veneer sheet material, the longitudinal positioning reference assembly 2 is arranged at the rear end of the belt conveyor 1, and includes a longitudinal positioning reference plate 21, three vertical brackets C22, and three bolts D23; the longitudinal positioning reference plate 21 is perpendicular to the feeding direction of the veneer sheet material; the longitudinal positioning reference plate 21 is installed on the vertical bracket C22 by means of bolts D23, and the vertical bracket C22 is fixed on the frame 113;

[0077] The longitudinal positioning reference assembly 2 cooperates with the belt conveyor 1 to complete the longitudinal positioning of the front end of the veneer sheet material.

[0078] Looking along the feeding direction of the veneer sheet material, the transverse positioning reference assembly 3 is arranged on the left side of the belt conveyor 1, and includes a transverse positioning reference plate 31, three vertical brackets E32, and three bolts F33; the transverse positioning reference plate 31 is parallel to the longitudinal feeding direction of the veneer sheet material; the transverse positioning reference plate 31 is installed on the vertical bracket E32 by bolts F33, and the vertical bracket E32 is fixed on the frame 113;

[0079] A series of semicircular grooves are formed at the lower part of the transverse positioning reference plate 31. The positions of the semicircular grooves match the positions of the upper roller, the upper pressure roller and the lower pressure roller. The radius of the semicircular grooves is slightly larger than the radius of the upper roller, so as to ensure that the side of the veneer sheet is in full contact with the transverse positioning reference plate 31 when the veneer sheet is positioned transversely.

[0080] The front end of the transverse positioning reference plate 31 has a small section bent to the left outside at a certain angle, which can guide the veneer material when it is fed longitudinally to prevent collision and jamming.

[0081] There are three groups of transverse alignment components 4, which are used to pull the veneer sheet toward the transverse positioning reference plate 31 to achieve transverse positioning of the veneer sheet; the transverse alignment components 4 are installed on the frame 113, and along the longitudinal feeding direction of the veneer sheet, the first group of transverse alignment components is located between the second upper roller and the third upper roller of the upper roller group 14, the second group of transverse alignment components is located between the sixth upper roller and the seventh upper roller of the upper roller group 14, and the third group of transverse alignment components is located between the tenth upper roller and the eleventh upper roller of the upper roller group 14;

[0082] Each set of transverse alignment components 4 includes a cylinder 41, an ear seat 42, a cylindrical guide rod 43, two guide rod slides 44, a guide rod protection cover 45, a block 46, a block slide 47, a block guide rail 48, and a transverse bracket 49. When viewed along the feeding direction of the veneer sheet material, the cylinder 41 is located on the left side, and the block 46 is located on the right side. The cylinder 41 adopts a single piston rod structure, and the rear end of the cylinder barrel of the cylinder 41 is installed on the transverse bracket 49 through the ear seat 42. The piston rod is connected to one end of the cylindrical guide rod 43, and the other end of the cylindrical guide rod 43 is connected to the block slide 47. The block guide rail 48 is fixed on the transverse bracket 49; the block 46 is a cylinder and is vertically fixed on the block slide 47; the block guide rail 48 has a rectangular cross section and cooperates with the block slide 47 to prevent the block 46 from deflecting and tilting; the upper surface of the block slide 47 and the upper surface of the guide rod protection cover 45 are slightly lower than the upper generatrix of the upper roller;

[0083] When compressed air is introduced into the rodless chamber of the cylinder 41, the piston rod extends, and the stopper 46 moves to the right side of the longitudinal feeding direction of the veneer sheet to the extreme position, away from the veneer sheet, so as to facilitate the unobstructed longitudinal feeding of the veneer sheet; when the front end of the veneer sheet contacts the longitudinal positioning reference plate 21, the narrow flat belt group 11 stops moving; compressed air is introduced into the rod chamber of the cylinder 41, and the stopper 46 moves to the left side of the longitudinal feeding direction of the veneer sheet, touches the right side surface of the veneer sheet, and pulls the veneer sheet to the left side, so that the left side surface of the veneer sheet contacts the transverse positioning reference plate 31, thereby realizing the transverse positioning of the veneer sheet; after the transverse positioning of the veneer sheet is completed, compressed air is introduced into the rodless chamber of the cylinder 41 again, the piston rod extends, and the stopper 46 returns to the right extreme position, waiting for the transverse positioning of the next veneer sheet.

[0084] The photoelectric switch assembly 5 includes a photoelectric switch H51, a switch bracket J52, a photoelectric switch K53, a switch bracket L54, a photoelectric switch M55, and a switch bracket N56; the photoelectric switch H51, the photoelectric switch K53, and the photoelectric switch M55 are respectively installed on the frame 113 through the switch bracket J52, the switch bracket L54, and the switch bracket N56, and are located in a straight line. The installation height is slightly lower than the upper busbar of the upper roller, and does not affect the movement of the veneer sheet; along the feeding direction of the veneer sheet, the photoelectric switch H51 is located at the axial position of the driven pulley 131, the photoelectric switch K53 is located between the fifth upper roller and the sixth upper roller of the upper roller group 14, and the photoelectric switch M55 is located between the eleventh upper roller of the upper roller group 14 and the longitudinal positioning reference plate 21;

[0085] A positioning method for a melamine impregnated paper veneer board stacking positioning machine comprises the following steps:

[0086] Step 1: After the melamine impregnated paper veneer sheet is cooled, it is transported to the front end of the belt conveyor 1 by the front roller conveyor or belt conveyor. When the photoelectric switch H51 senses the front end of the veneer sheet, it sends a signal to start the variable frequency speed regulating motor drive unit 110, driving the narrow flat belt group 11 to run quickly, and the veneer sheet is quickly fed longitudinally;

[0087] Step 2, when the photoelectric switch K53 senses the front end of the veneer sheet, it sends a signal to decelerate the variable frequency speed regulating motor drive unit 110, drive the narrow flat belt group 11 to run slowly, and feed the veneer sheet slowly longitudinally to prevent the front end of the veneer sheet from impacting the longitudinal positioning reference plate 21;

[0088] Step 3, when the photoelectric switch M55 senses the front end of the veneer sheet, it sends a signal to delay the control of the variable frequency speed regulating motor drive unit 110 to stop, so that the narrow flat belt group 11 continues to run for a short period of time, ensuring that the front end of the veneer sheet is close to the longitudinal positioning reference plate 21, and the longitudinal precise positioning of the veneer sheet is achieved through the cooperation between the belt transport device 1 and the longitudinal positioning reference plate 21;

[0089] Step 4, when the photoelectric switch M55 senses the front end of the veneer sheet, it also sends a signal to control the three groups of lateral alignment components 4 to act synchronously, and the rod chamber of the cylinder 41 is passed with compressed air to move the stopper 46 to the left side of the veneer sheet feeding direction, and pull the veneer sheet to move to the left side, so that the left side of the veneer sheet is closely attached to the lateral positioning reference plate 31, so as to realize the lateral precise positioning of the veneer sheet;

[0090] Step 5: After the veneer sheet is transversely positioned, the cylinder 41 of the transverse alignment assembly 4 moves in the opposite direction, and the stopper 46 moves to the right side of the longitudinal feeding direction of the veneer sheet, waiting for the transverse positioning of the next veneer sheet;

[0091] Step 6: After the veneer sheet is positioned longitudinally and transversely, it is sucked away by the rear CNC vacuum translation machine or four-axis robot and the stack is removed, and then steps 1 to 5 are repeated.

[0092] The invention has been applied in production and has good effect.

[0093] The above describes the basic principles and main structural features of the present invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A melamine impregnated paper veneer board stacking and positioning machine, characterized in that: It comprises a belt transport device (1), a longitudinal positioning reference component (2), a transverse positioning reference component (3), a transverse alignment component (4), and a photoelectric switch component (5); A belt transport device (1) comprises a narrow flat belt group (11), a driving pulley shaft assembly (12), a driven tension pulley assembly (13), an upper idler roller group (14), an upper pressure roller group (15), a lower idler roller group (16), a front guide roller (17), a rear guide roller (18), a lower pressure roller (19), a variable frequency speed regulating motor drive unit (110), a multi-V belt (111), a safety cover (112), and a frame (113); The narrow flat belt group (11) has a total of 4 narrow flat belts, which are arranged perpendicular to the sheet material feeding direction, and the distance between two adjacent narrow flat belts is equal; The driving pulley shaft assembly (12) is located at the rear end of the belt conveyor (1), and comprises a driving shaft (121), four driving pulleys (122), two supporting rollers (123), three bearing seats (124), and a driven multi-V belt pulley (125); the driving pulley (122), the supporting roller (123), and the driven multi-V belt pulley (125) are fixedly connected to the driving shaft (121) via a key; the driving shaft (121) is mounted on the frame (113) via three bearing seats (124), and one bearing seat (124) is arranged at each end and middle position of the driving shaft (121); and the two supporting rollers (123) are arranged at each end of the driving shaft (121); The driven tension pulley assembly (13) is located at the front end of the belt conveyor (1), and comprises a driven pulley (131), a bearing seat with a screw (132), a nut (133), a guide support plate (134), and a driven pulley bracket (135); the driven pulley bracket (135) is installed on the frame (113); there are four driven pulleys (131), each driven pulley (131) is supported on the driven pulley bracket (135) by two bearing seats with a screw (132), and the position of the driven pulley (131) is adjusted by adjusting the nut (133); a guide support plate (134) is respectively provided at both ends of the driven pulley bracket (135); The upper roller group (14) has 11 upper rollers in total, which are evenly arranged along the feeding direction of the veneer sheet material and are mounted on the frame (113) through supports at the same installation height; The upper pressing roller group (15) has a total of 3 upper pressing rollers. When viewed along the feeding direction of the veneer sheet material, the 3 upper pressing rollers are respectively arranged between the third upper roller and the fourth upper roller, between the seventh upper roller and the eighth upper roller, and between the ninth upper roller and the tenth upper roller of the upper roller group (14), so as to press the upper edge of the narrow flat belt downward by a certain distance, so as to increase the wrap angle between the narrow flat belt and two upper rollers adjacent to the upper pressing roller, and at the same time make the narrow flat belt fit closely with the other upper rollers; The diameter of the upper pressure roller is smaller than that of the upper support roller. The three upper pressure rollers divide the upper edge of the narrow flat belt into four front and rear areas, and the two areas near the rear end of the belt conveyor (1) are smaller. The front guide roller (17) is arranged at the front end of the belt conveyor (1), and is located below the driven tension pulley assembly (13) and slightly inside. The rear guide roller (18) is arranged at the rear end of the belt conveyor (1), and is located below the driving pulley shaft assembly (12) and slightly inside. The lower roller group (16) includes two lower rollers, which are arranged between the front guide roller (17) and the rear guide roller (18); A lower pressure roller (19) is arranged between the driving pulley shaft assembly (12) and the eleventh upper roller of the upper roller group (14), and the lower pressure roller (19) is installed on the frame (113) to press the lower edge of the narrow flat belt between the driving pulley shaft assembly (12) and the rear guide roller (18) upward to increase the wrap angle of the narrow flat belt on the driving pulley (122); The variable frequency speed regulating motor drive unit (110) is mounted on a frame (113); a driving multi-V belt pulley is mounted on the shaft of the variable frequency speed regulating motor drive unit (110); a multi-V belt transmission pair is formed by a multi-V belt (111) and a driven multi-V belt pulley (125) on a driving belt pulley shaft assembly (12); the driving shaft (121) and the driving belt pulley (122) are driven to rotate, so that the narrow flat belt group (11) runs; Viewed along the feeding direction of the veneer sheet material, the longitudinal positioning reference assembly (2) is arranged at the rear end of the belt conveyor (1), and comprises a longitudinal positioning reference plate (21), three vertical brackets C (22), and three bolts D (23); the longitudinal positioning reference plate (21) is perpendicular to the feeding direction of the veneer sheet material; the longitudinal positioning reference plate (21) is mounted on the vertical bracket C (22) by means of bolts D (23), and the vertical bracket C (22) is fixed on the frame (113); Viewed along the feeding direction of the veneer sheet material, the transverse positioning reference assembly (3) is arranged on the left side of the belt conveyor (1), and comprises a transverse positioning reference plate (31), three vertical brackets E (32), and three bolts F (33); the transverse positioning reference plate (31) is parallel to the longitudinal feeding direction of the veneer sheet material; the transverse positioning reference plate (31) is mounted on the vertical bracket E (32) by means of bolts F (33), and the vertical bracket E (32) is fixed on the frame (113); There are three groups of transverse alignment components (4) installed on the frame (113). Looking along the longitudinal feeding direction of the veneer sheet material, the first group of transverse alignment components is located between the second upper roller and the third upper roller of the upper roller group (14), the second group of transverse alignment components is installed between the sixth upper roller and the seventh upper roller of the upper roller group (14), and the third group of transverse components is located between the tenth upper roller and the eleventh upper roller of the upper roller group (14); Each set of transverse alignment components (4) comprises a cylinder (41), an ear seat (42), a cylindrical guide rod (43), two guide rod slide seats (44), a guide rod protection cover (45), a stopper (46), a stopper slide seat (47), a stopper guide rail (48), and a transverse bracket (49); when viewed along the feeding direction of the veneer sheet material, the cylinder (41) is located on the left side, and the stopper (46) is located on the right side; the cylinder (41) adopts a single piston rod structure, and the rear end of the cylinder barrel of the cylinder (41) is installed on the transverse bracket (49) through the ear seat (42). The piston rod of (41) is connected to one end of the cylindrical guide rod (43), the other end of the cylindrical guide rod (43) is connected to the block slide (47), and the block guide rail (48) is fixed on the transverse bracket (49); the block (46) is a cylinder and is vertically fixed on the block slide (47); the block guide rail (48) has a rectangular cross section and cooperates with the block slide (47) to prevent the block (46) from deflecting and tilting; the upper surface of the block slide (47) and the upper surface of the guide rod protection cover (45) are slightly lower than the upper generatrix of the upper roller; The photoelectric switch assembly (5) comprises a photoelectric switch H (51), a switch bracket J (52), a photoelectric switch K (53), a switch bracket L (54), a photoelectric switch M (55), and a switch bracket N (56); the photoelectric switch H (51), the photoelectric switch K (53), and the photoelectric switch M (55) are respectively installed on the frame (113) through the switch bracket J (52), the switch bracket L (54), and the switch bracket N (56), and are located in a straight line, and the installation height is slightly lower than the upper generatrix of the upper roller; along the feeding direction of the veneer board material, the photoelectric switch H (51) is located at the axial position of the driven pulley (131), the photoelectric switch K (53) is located between the fifth upper roller and the sixth upper roller of the upper roller group (14), and the photoelectric switch M (55) is located between the eleventh upper roller of the upper roller group (14) and the longitudinal positioning reference plate (21); The front guide roller (17), the rear guide roller (18), and the lower roller group (16) are all installed on the frame (113), and the front guide roller (17), the rear guide roller (18), and the lower roller group (16) are all located below the upper roller group (14); All upper rollers of the upper roller group (14) are hollow structures, rolling bearings are installed inside the two ends of the upper rollers, and the middle shaft does not rotate; the structure and size of the lower rollers are the same as those of the upper rollers; A series of semicircular grooves are formed at the lower part of the transverse positioning reference plate (31), the positions of the semicircular grooves coincide with the positions of the upper roller, the upper pressure roller and the lower pressure roller, and the radius of the semicircular grooves is slightly larger than the radius of the upper roller; a small section of the front end of the transverse positioning reference plate (31) is bent toward the left outer side.

2. The positioning method of the melamine impregnated paper veneer board stacking positioning machine according to claim 1 comprises the following steps: Step 1: After the melamine impregnated paper veneer sheet is cooled, it is transported to the front end of the belt conveyor (1) by the front roller conveyor or belt conveyor. When the photoelectric switch H (51) senses the front end of the veneer sheet, it sends a signal to start the variable frequency speed regulating motor drive unit (110), driving the narrow flat belt group (11) to run quickly, so that the veneer sheet is fed vertically quickly; Step 2: When the photoelectric switch K (53) senses the front end of the veneer sheet, a signal is sent to decelerate the variable frequency speed regulating motor drive unit (110), drive the narrow flat belt group (11) to run slowly, and feed the veneer sheet longitudinally at a slow speed to prevent the front end of the veneer sheet from impacting the longitudinal positioning reference plate (21); Step 3, when the photoelectric switch M (55) senses the front end of the veneer sheet, a signal is sent to delay the stop of the variable frequency speed regulating motor drive unit (110) through delay control, so that the narrow flat belt group (11) continues to run for a short period of time, ensuring that the front end of the veneer sheet is in close contact with the longitudinal positioning reference plate (21), and the longitudinal precise positioning of the veneer sheet is achieved through the cooperation of the belt transport device (1) and the longitudinal positioning reference plate (21); Step 4, when the photoelectric switch M (55) senses the front end of the veneer sheet, it also sends a signal to control the three groups of lateral alignment components (4) to act synchronously, and the rod chamber of the cylinder (41) is introduced with compressed air, so that the stopper (46) moves to the left side of the veneer sheet feeding direction, and pulls the veneer sheet to move to the left side, so that the left side of the veneer sheet is closely attached to the lateral positioning reference plate (31), thereby realizing the lateral precise positioning of the veneer sheet; Step 5: After the veneer sheet is transversely positioned, the cylinder (41) of the transverse alignment assembly (4) moves in the opposite direction, and the stopper (46) moves to the right side of the longitudinal feeding direction of the veneer sheet, waiting for the transverse positioning of the next veneer sheet; Step 6: After the veneer sheet is positioned longitudinally and transversely, it is sucked away by the rear CNC vacuum translation machine or four-axis robot and the stack is removed, and then steps 1 to 5 are repeated.

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