Wood sheet double-sided gluing machine

Abstract

A top gluing roller and a bottom gluing roller which are distributed up and down and arranged in parallel are arranged in the middle in a portal frame, the bottom surface of the top gluing roller is in extrusion contact with the top surface of the bottom gluing roller, a glue extrusion roller is arranged on one side of the top gluing roller in parallel, and the top gluing roller is provided with a rigid core roller A, a hard glue roller sleeve A and a sponge rubber roller sleeve A; the gluing bottom roller is provided with a rigid core roller B, a hard rubber roller B and a sponge rubber roller sleeve B, the hardness of the sponge rubber roller sleeve B is larger than that of the sponge rubber roller sleeve A, the rubber extrusion roller is in extrusion contact with the sponge rubber roller sleeve A, and the sponge rubber roller sleeve B extrudes the sponge rubber roller sleeve A to make contact with the hard rubber roller A. According to the structure, the double-sided gluing machine for the wood sheets has the advantages that glue liquid can be uniformly dispersed in the sponge rubber roller sleeve A on the surface of the top gluing roller and the sponge rubber roller sleeve B on the surface of the bottom gluing roller, so that the top surfaces and the bottom surfaces of the wood sheets can be uniformly glued at the same time.

Description

Technical Field

[0001] This invention relates to the technical field of wood veneer gluing, and more specifically to a wood veneer double-sided gluing machine. Background Technology

[0002] Multi-layer solid wood boards are made by gluing and hot-pressing multiple layers of wood veneers. Compared to ordinary plywood, multi-layer solid wood boards have less deformation, higher strength, better internal quality (smaller holes and no delamination after cutting and sawing), better flatness, and can be produced in different thicknesses. Multi-layer solid wood boards use cross-laminated plywood as the base material; the surface is covered with high-quality solid wood veneer or engineered wood to serve as wood veneer.

[0003] In existing technologies, the preparation of multi-layer solid wood boards involves drying wood veneers, splicing them into larger or continuous veneers, cutting them into uniform veneer units, applying glue to the surface of the veneer units, stacking them into a certain number of layers, and then hot-pressing them into shape.

[0004] Due to increasingly stringent environmental regulations, the formaldehyde content requirements for multi-layer solid wood boards are particularly high. Therefore, water-based adhesives are now primarily used in the production of multi-layer solid wood boards to reduce or even eliminate formaldehyde release. However, water-based adhesives have relatively low viscosity, requiring a certain amount of adhesive to be applied to the surface of the wood veneer using a specific pressure to ensure effective coating. Existing glue coating equipment uses glue rollers. However, due to the characteristics of the glue rollers, the thickness of the glue that can be carried on their surface is related to the viscosity of the glue. If the viscosity of the glue is high, the amount of glue carried by the glue roller before contacting the wood veneer is sufficient to meet the glue coating thickness of the wood veneer. However, if the viscosity of the glue is low, the amount of glue that the glue roller can carry will be less, resulting in insufficient glue coating thickness on the surface of the wood veneer. This leads to poor hot pressing effect of the wood veneer, which in turn causes gaps, hollows, or even delamination between multiple layers of solid wood boards during subsequent use. Even if the amount of glue carried on the surface of the glue roller is increased, the low viscosity and low surface tension will cause the glue to drip directly before contacting the wood veneer or fly off during the rotation of the glue roller.

[0005] Furthermore, to achieve better heat-pressing results after stacking adjacent wood veneers, the top and bottom surfaces of the veneers need to be coated with glue separately. However, existing glue-coating equipment typically carries the glue onto the surface of the glue rollers above the veneers, making it impossible to simultaneously coat both surfaces. Some glue-coating equipment requires two glue tanks, one for each roller in contact with the top and bottom surfaces of the veneers. This type of equipment requires separate glue supply to the rollers, and operators must monitor the glue levels in both tanks individually. It's impossible to ensure that a single glue supply evenly carries the appropriate amount of glue to each roller in contact with the top and bottom surfaces. Any issue with the glue level in even one tank will affect the glue-coating quality, increasing operator workload and the likelihood of glue-coating defects.

[0006] To this end, the applicant, in collaboration with Jiangsu Chaoneng New Material Technology Co., Ltd., developed a device for simultaneously and uniformly applying glue to both sides of wood veneer. The applicant was primarily involved in the research and development of the overall structure and glue application function of the glue applicator. Summary of the Invention

[0007] The purpose of this invention is to overcome the shortcomings of the prior art and provide a double-sided glue coating machine for wood veneers, which enables the sponge rubber roller sleeve A on the surface of the top glue coating roller and the sponge rubber roller sleeve B on the surface of the bottom glue coating roller to be evenly dispersed with glue, thereby achieving simultaneous and uniform glue coating on the top and bottom surfaces of the wood veneers.

[0008] The technical solution adopted in this invention is: A double-sided wood veneer gluing machine includes a gantry frame. A set of gluing rollers is located in the center of the gantry frame. The gluing roller set includes a top gluing roller and a bottom gluing roller arranged vertically and in parallel. The bottom surface of the top gluing roller and the top surface of the bottom gluing roller are in contact. A glue-extruding roller is also arranged parallel to the top gluing roller within the gantry frame, on one side of the top gluing roller. The glue-extruding roller is in contact with the opposing surfaces of the top gluing roller. The top gluing roller is driven by a motor. The top gluing roller is also driven by the bottom gluing roller and the glue-extruding roller. A glue-gathering groove is formed in the upper region between the top gluing roller and the glue-extruding roller. The contact surfaces of the top gluing roller and the glue-extruding roller rotate downwards at the same linear velocity, and simultaneously move away from the glue-extruding roller at the same linear velocity. The top roller is rotated, and from the inside out, it is coaxially fixed with a rigid core roller A, a hard rubber roller sleeve A, and a sponge rubber roller sleeve A. The bottom roller is coaxially fixed from the inside out with a rigid core roller B, a hard rubber roller B, and a sponge rubber roller sleeve B. The hardness of the sponge rubber roller sleeve B is greater than that of the sponge rubber roller sleeve A. The side of the extrusion roller facing the top roller is pressed into contact with the sponge rubber roller sleeve A and is spaced apart from the side edge where the hard rubber roller A is located. The side of the sponge rubber roller sleeve B facing the top roller presses the sponge rubber roller sleeve A until it contacts the hard rubber roller A. A glue collection trough is also fixedly provided inside the gantry below the bottom roller. The top roller, bottom roller, and extrusion roller are all located directly above the glue collection trough.

[0009] A further improvement of the present invention is that when the sponge rubber roller sleeve B is pressed against the side of the glue-applying top roller until it contacts the hard rubber roller A, the remaining thickness of the sponge rubber roller sleeve B on the side that is pressed against the hard rubber roller A is still greater than or equal to the thickness of the wood veneer being glued.

[0010] A further improvement of the present invention is that, inside the gantry frame, on the side where the extrusion roller is located between the top and bottom rollers of the glue coating, a glue feeding guide plate is also provided. The bottom edge of the glue feeding guide plate on the side away from the bottom roller of the glue coating is swayingly connected to the gantry frame via a hinge. The edge of the glue feeding guide plate facing the bottom roller of the glue coating is pressed and placed on the upper surface of the bottom roller facing the extrusion roller. The hinge is arranged parallel to the axis of the bottom roller of the glue coating.

[0011] A further improvement of the present invention is that the adhesive coating and feeding guide plate is connected to the gantry frame by a spring with a pre-acting force, and the restoring force of the spring causes the adhesive coating and feeding guide plate to squeeze the sponge rubber roller sleeve B it contacts.

[0012] A further improvement of the present invention is that the bottom edge of the adhesive coating guide plate that contacts the sponge rubber roller sleeve B is provided with a strip-shaped protrusion extending downwards along the side edge.

[0013] A further improvement of the present invention is that the bottom of the glue-applying guide plate is further provided with a glue-guiding vertical plate, the glue-guiding vertical plate is arranged parallel to the axis of the glue-applying bottom roller, and the bottom of the glue-guiding vertical plate extends downward to be located in the glue collection groove.

[0014] A further improvement of the present invention is that a negative pressure box is fixedly installed inside the gantry frame, between the glue-applying guide plate and the extrusion roller. The negative pressure box extends below the contact point between the glue-applying top roller and the extrusion roller, and is open at the contact point between the glue-applying top roller and the extrusion roller. The edge of the open side facing the glue-applying top roller is set along the surface of the glue-applying top roller and has a gap with it. A flexible scraper is fixed to the top edge of the open side facing the extrusion roller. The bottom edge of the flexible scraper is fixed to the inner wall of the negative pressure box, and the top edge of the flexible scraper is in contact with the lower surface of the extrusion roller. The bottom of the negative pressure box is provided with a connecting pipe that communicates with the negative pressure pipe.

[0015] A further improvement of the present invention is that the bottom plate of the glue-applying guide plate and the bottom plate of the negative pressure box are both inclined downwards in the direction away from the glue-applying bottom roller, and the bottom plate of the negative pressure box extends downwards from the edge of the glue-applying top roller to provide a glue-applying guide top plate, and the distance between the glue-applying guide top plate and the glue-applying guide bottom plate increases in the direction away from the glue-applying top roller.

[0016] A further improvement of the present invention is that the connecting pipes are symmetrically arranged at the bottom of the two side walls of the negative pressure box on the side where the glue-coating and feeding guide top plate is located. The negative pressure pipes are respectively inserted through and fixed to the corresponding side plates of the gantry frame. The end of the connecting pipe away from the negative pressure box and the end of the negative pressure pipe inside the gantry frame extend downward from the top of the glue collection tank into the glue collection tank. The glue collection tank is fixed to the side plate. The bottom of the glue collection tank is respectively connected to a glue collection pipe. The bottom end of the glue collection pipe extends downward to below the glue liquid surface in the glue collection tank.

[0017] A further improvement of the present invention is that a downwardly arranged glue discharge pipe is connected to the bottom of the glue collection tank, and a glue discharge valve is provided at the bottom of the glue discharge pipe. One side of the glue discharge pipe, above the glue discharge valve, is connected to the inlet of the liquid pump. The outlet of the liquid pump is connected to the glue supply pipe. A glue tank is fixedly arranged in the gantry frame directly above the glue collection tank. The end of the glue supply pipe away from the liquid pump extends downward into the upper part of the glue tank. A glue dripping pipe is provided at the bottom of the glue tank. The lower opening of the glue dripping pipe is a strip tube corresponding to the extension direction of the glue collection tank. The bottom opening of the glue dripping pipe is a strip hole corresponding to the extension direction of the glue collection tank. The two ends of the strip hole are respectively located at corresponding end positions within the range of the glue collection tank, and the length of the strip hole is less than the length of the glue collection tank.

[0018] The beneficial effects of this invention are as follows: First, the wood veneer double-sided gluing machine of this application has a rigid core roller A, a hard rubber roller sleeve A, and a sponge rubber roller sleeve A on the top gluing roller, and a rigid core roller B, a hard rubber roller B, and a sponge rubber roller sleeve B on the bottom gluing roller. The hardness of the sponge rubber roller sleeve B is greater than that of the sponge rubber roller sleeve A. The extrusion roller and the sponge rubber roller sleeve A are in extrusive contact, and the sponge rubber roller sleeve B extrudes the sponge rubber roller sleeve A until it comes into contact with the hard rubber roller A. This allows the glue to be evenly dispersed on the surface of the sponge rubber roller sleeve A on the top gluing roller and the surface of the sponge rubber roller sleeve B on the bottom gluing roller, thereby achieving uniform gluing on the top and bottom surfaces of the wood veneer simultaneously.

[0019] Secondly, in the wood veneer double-sided gluing machine of this application, when the sponge rubber roller sleeve B squeezes the sponge rubber roller sleeve A until it contacts the hard rubber roller A, the thickness of the sponge rubber roller sleeve B in contact with the hard rubber roller A is greater than or equal to the thickness of the wood veneer to be glued, thereby ensuring that there is sufficient squeezing allowance when the wood veneer passes between the top and bottom gluing rollers, which facilitates the smooth passage and gluing of the top and bottom surfaces of the wood veneer.

[0020] Third, the wood veneer double-sided gluing machine of this application, through the setting of the gluing and feeding guide plate, facilitates the feeding of wood veneer between the gluing top roller and the gluing bottom roller.

[0021] Fourth, the wood veneer double-sided gluing machine of this application uses strip-shaped protrusions on the gluing and feeding guide plate to press and contact the sponge rubber roller sleeve B of the gluing bottom roller under the action of springs. This ensures the consistency of the amount of glue when the sponge rubber roller sleeve B contacts the wood veneer, and avoids excessive glue on the surface of the sponge rubber roller sleeve B, which would result in excessive glue being applied to the bottom surface of the wood veneer, leading to an increase in the thickness of the glue layer between adjacent layers of wood veneer, or even excessive glue dripping from the bottom surface of the wood veneer, polluting the surrounding environment and wasting glue.

[0022] Fifth, in the wood veneer double-sided gluing machine of this application, the glue guiding plate at the bottom of the glue feeding guide plate extends downward into the glue collection tank, thereby smoothly returning the excess glue squeezed out by the strip protrusion of the glue feeding guide plate to the glue collection tank, avoiding glue dripping and polluting the surrounding environment and glue waste.

[0023] Sixth, in the wood veneer double-sided gluing machine of this application, the negative pressure box is open at the contact point between the gluing top roller and the extrusion roller. A flexible scraper is provided on the top edge of the open side facing the extrusion roller, which can make the glue in the sponge rubber sleeve A of the gluing top roller more evenly dispersed, ensuring uniform gluing of the wood veneer. In addition, the glue on the surface of the extrusion roller is scraped off to prevent residual glue on the surface of the extrusion roller from dripping and polluting the surrounding environment.

[0024] Seventh, in the wood veneer double-sided gluing machine of this application, the bottom plate of the negative pressure box extends downward from the edge of the gluing top roller and is provided with a gluing feeding guide top plate. The distance between the gluing feeding guide top plate and the gluing feeding guide bottom plate increases in the direction away from the gluing top roller, thereby further facilitating the feeding and guiding of the wood veneer.

[0025] Eighth, in the wood veneer double-sided gluing machine of this application, the connecting pipe is connected to the negative pressure pipe through the glue collection tank. The bottom of the glue collection tank extends downward through the glue collection pipe to below the glue liquid surface in the glue collection tank, so as to collect the glue liquid in the negative pressure box and let it fall back into the glue collection tank. At the same time, it is connected to the negative pressure device to ensure the negative pressure effect of the negative pressure box.

[0026] Ninth, the wood veneer double-sided gluing machine of this application, through the structural design of the glue collection tank, can not only discharge the glue in the glue collection tank when not in use, but also supply the glue in the glue collection tank to the glue mixing tank as required by the liquid pump, and match the dripping speed of the glue in the glue mixing tank and the required amount of glue in the glue mixing tank, so as to achieve the technical effect of automatic glue supply and automatic return of excess glue to the glue collection tank.

[0027] Tenth, the wood veneer double-sided gluing machine of this application, through the position and structure of the gluing top roller, gluing bottom roller and extrusion roller, and the connection between the glue collection tank and the glue collection box through the liquid pump, realizes that only one glue collection box is needed to achieve separate gluing of the gluing top roller and the gluing bottom roller. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the front sectional view of this application.

[0029] Figure 2 This is a side view of the side where the feed side of this application is located. Detailed Implementation

[0030] Combination Figures 1-2It is known that the wood veneer double-sided gluing machine includes a gantry frame 1. A set of gluing rollers is arranged in the middle of the gantry frame 1. The gluing roller set includes a top gluing roller 4 and a bottom gluing roller 5 arranged vertically and in parallel. The bottom surface of the top gluing roller 4 and the top surface of the bottom gluing roller 5 are in contact. A glue extrusion roller 6 is also arranged parallel to the top gluing roller 4 on one side of the gantry frame 1. The glue extrusion roller 6 is in contact with the opposing surfaces of the top gluing roller 4. The top gluing roller 4 is driven by a motor. The top gluing roller 4 is driven by the bottom gluing roller 5 and the glue extrusion roller 6 respectively. A glue-gathering groove is formed in the upper area between the top gluing roller 4 and the glue extrusion roller 6. The contact surfaces of the top gluing roller 4 and the glue extrusion roller 6 rotate downwards at the same linear speed, and the contact surfaces of the top gluing roller 4 and the bottom gluing roller 5 rotate away from the glue extrusion roller 6 at the same linear speed. The top roller 4 is coaxially fixed with a rigid core roller A15, a hard rubber roller sleeve A16, and a sponge rubber roller sleeve A17 from the inside out. The bottom roller 5 is coaxially fixed with a rigid core roller B18, a hard rubber roller B19, and a sponge rubber roller sleeve B20 from the inside out. The hardness of the sponge rubber roller sleeve B20 is greater than that of the sponge rubber roller sleeve A17. The side of the extrusion roller 6 facing the top roller 4 is in contact with the sponge rubber roller sleeve A17 and is spaced from the side edge of the hard rubber roller A16. The side of the sponge rubber roller sleeve B20 facing the top roller 4 is used to press the sponge rubber roller sleeve A17 until it contacts the hard rubber roller A16. A glue collection trough 8 is also fixedly provided inside the gantry frame 1 below the bottom roller 5. The top roller 4, the bottom roller 5, and the extrusion roller 6 are all located directly above the area of ​​the glue collection trough 8.

[0031] When the sponge rubber roller sleeve B20 presses the sponge rubber roller sleeve A17 against the glue-applying top roller 4 until it contacts the hard rubber roller A16, the remaining thickness of the sponge rubber roller sleeve B20 on the side that is pressed and in contact with the hard rubber roller A16 is still greater than or equal to the thickness of the wood veneer being glued.

[0032] The through-hole density in the sponge rubber roller sleeve B20 is less than the through-hole density in the sponge rubber roller sleeve A17.

[0033] The diameter of the through hole in the sponge rubber roller sleeve B20 is smaller than the diameter of the through hole in the sponge rubber roller sleeve A17.

[0034] When the side of the sponge rubber roller sleeve B20 facing the glue-applying top roller 4 is pressed into contact with the sponge rubber roller sleeve A17, the remaining total compressible thickness of the side of the sponge rubber roller sleeve B20 and the sponge rubber roller sleeve A17 that is pressed into contact is still greater than or equal to the thickness of the wood veneer being glued.

[0035] Inside the gantry frame 1, on one side where the extrusion roller 6 is located between the top glue-coating roller 4 and the bottom glue-coating roller 5, there is also a glue-coating and feeding guide plate 13. The bottom edge of the glue-coating and feeding guide plate 13 on the side away from the bottom glue-coating roller 5 is swayed and connected to the gantry frame 1 by a hinge 28. The edge of the glue-coating and feeding guide plate 13 facing the bottom glue-coating roller 5 is pressed and placed on the upper surface of the bottom glue-coating roller 5 facing the extrusion roller 6. The hinge 28 is arranged parallel to the axis of the bottom glue-coating roller 5.

[0036] The adhesive coating and feeding guide plate 13 is connected to the gantry frame 1 via a spring 31 with a pre-acting force. The restoring force of the spring 31 causes the adhesive coating and feeding guide plate 13 to squeeze the sponge rubber roller sleeve B20 it contacts.

[0037] The bottom edge of the adhesive coating and feeding guide plate 13 that contacts the sponge rubber roller sleeve B20 also has a strip-shaped protrusion extending downwards along the side edge.

[0038] Inside the gantry frame 1, between the glue-applying guide plate 13 and the glue collection trough 8, a base rod 30 is fixedly arranged parallel to the axis of the glue-applying roller 5. One end of the spring 31 is connected to the base rod 30, and the other end of the spring 31 is connected to the glue-applying guide plate 13.

[0039] Multiple springs 31 are provided and are arranged symmetrically along the length of the base rod 30 with the central axis of the adhesive application guide plate 13 as the axis of symmetry.

[0040] The bottom of the glue-applying guide plate 13 is also provided with a glue-guiding upright plate 32. The glue-guiding upright plate 32 is arranged parallel to the axis of the glue-applying bottom roller 5, and the bottom of the glue-guiding upright plate 32 extends downward into the glue collection trough 8.

[0041] A negative pressure box 14 is fixedly installed inside the gantry frame 1, between the glue coating and feeding guide plate 13 and the extrusion roller 6. The negative pressure box 14 extends below the contact point between the glue coating top roller 4 and the extrusion roller 6. The negative pressure box 14 is open at the contact point between the glue coating top roller 4 and the extrusion roller 6. The edge of the open side facing the glue coating top roller 4 is set along the surface of the glue coating top roller 4 and there is a gap between the open side and the glue coating top roller 4. A flexible scraper 26 is fixed to the top edge of the open side facing the extrusion roller 6. The bottom edge of the flexible scraper 26 is fixed to the inner wall of the negative pressure box 14. The top edge of the flexible scraper 26 is in contact with the lower surface of the extrusion roller 6. The bottom of the negative pressure box 14 is provided with a connecting pipe 22 that communicates with the negative pressure pipe 23.

[0042] The bottom plates of the glue-applying guide plate 13 and the negative pressure box 14 are both inclined downwards in the direction away from the glue-applying bottom roller 5, and the bottom plate of the negative pressure box 14 extends downwards from the edge of the glue-applying top roller 4 to provide a glue-applying guide plate 27. The distance between the glue-applying guide plate 27 and the glue-applying guide bottom plate 13 increases in the direction away from the glue-applying top roller 4.

[0043] The edge of the glue-applying top plate 27, away from the glue-applying top roller 4, bends upward to form the glue-applying inlet 29.

[0044] The connecting pipes 22 are symmetrically arranged at the bottom of the two side walls of the negative pressure box 14 on the side where the glue application guide plate 27 is located. The negative pressure pipes 23 are respectively inserted through and fixed to the corresponding side plates 2 of the gantry frame 1. The end of the connecting pipe 22 away from the negative pressure box 14 and the end of the negative pressure pipe 23 inside the gantry frame 1 extend downward from the top of the glue collection tank 24 into the glue collection tank 24. The glue collection tank 24 is fixed to the side plate 2. The bottom of the glue collection tank 24 is respectively connected to the glue collection pipe 25. The bottom end of the glue collection pipe 25 extends downward to below the glue liquid surface in the glue collection tank 8.

[0045] The negative pressure pipe 23 extends out of the side plate 2 and is connected to the negative pressure device.

[0046] The surface circumference of the glue-applying roller 5 is greater than or equal to the length of the wood veneer in the conveying direction.

[0047] The bottom of the adhesive collection tank 8 is connected to a downwardly arranged adhesive discharge pipe 9. The bottom of the adhesive discharge pipe 9 is equipped with an adhesive discharge valve 10. One side of the adhesive discharge pipe 9, above the adhesive discharge valve 10, is connected to the inlet of the liquid pump 11. The outlet of the liquid pump 11 is connected to the adhesive supply pipe 12. The gantry frame 1 is fixedly arranged above the adhesive collection tank along the adhesive collection tank. The end of the adhesive supply pipe 12 away from the liquid pump 11 extends downward into the upper part of the adhesive collection tank 7. The bottom of the adhesive collection tank 7 is equipped with an adhesive dripping pipe 21. The lower opening of the adhesive dripping pipe 21 is a strip tube corresponding to the extension direction of the adhesive collection tank. The bottom opening of the adhesive dripping pipe 21 is a strip hole corresponding to the extension direction of the adhesive collection tank. The two ends of the strip hole are respectively located at corresponding end positions within the range of the adhesive collection tank, and the length of the strip hole is less than the length of the adhesive collection tank.

[0048] The glue supply pipe 12 is fixed to the bottom of the corresponding side plate 2 and top plate 3 inside the gantry frame 1, and the two ends of the glue box 7 are fixed to the corresponding side plate 2 inside the gantry frame 1.

[0049] The shaft A, which is coaxially arranged at both ends of the top roller 4, the shaft B, which is coaxially arranged at both ends of the bottom roller 5, and the shaft C, which is coaxially arranged at both ends of the extrusion roller 6, are rotatably connected to the side plate 2 on the corresponding side of the gantry frame 1. The shafts A, B, and C connected to the side plate 2 on one side extend out of the side plate 2 and are connected to the drive motor through a transmission device.

[0050] In this application, the adhesive is added to the adhesive collection tank 8 so that the liquid level of the adhesive in the adhesive collection tank 8 is higher than the bottom opening of the adhesive collection pipe 25; then the negative pressure device generates negative pressure through the negative pressure pipe 23, and the drive motor drives the top roller 4, the bottom roller 5, and the extrusion roller 6 to rotate simultaneously. In addition, the liquid pump 11 transfers the adhesive in the adhesive collection tank 8 to the polymer tank 7 through the glue supply pipe 12. The adhesive in the polymer tank 7 drips evenly from the bottom opening of the drip pipe 21 into the polymer tank. The adhesive in the polymer tank wets the sponge rubber roller sleeve A17 that it contacts, so that the sponge rubber roller sleeve A17 at the corresponding position is filled with adhesive. The pumping rate or time of the liquid pump 11 is adjusted so that the amount of adhesive in the polymer tank 7 is relatively dynamically stable, and the amount of adhesive in the polymer tank is also kept stable.

[0051] As the top roller 4 and the extrusion roller 6 rotate, the sponge rubber sleeve A17, filled with adhesive, rotates until it contacts and is squeezed by the extrusion roller 6. The portion of adhesive squeezed by the extrusion roller 6 is expelled from the sponge rubber sleeve A17, while the portion not squeezed remains inside. As it continues to rotate downwards and separates from the extrusion roller 6, the sponge rubber sleeve A17 returns to its original state, simultaneously bringing it closer to the hard rubber roller A1. The remaining adhesive on the side not squeezed by the extrusion roller 6 disperses towards the location where the sponge rubber roller sleeve A17 has just returned to its original state. Although the elastic recovery of the sponge rubber roller sleeve A17 after leaving the extrusion roller 6 allows the adhesive to disperse towards the outer surface of the sponge rubber roller sleeve A17, the amount of remaining adhesive inside the sponge rubber roller sleeve A17 is greatly reduced after being squeezed by the extrusion roller 6, which still results in uneven adhesive density inside the sponge rubber roller sleeve A17, with the adhesive density decreasing along the direction away from the hard rubber roller A16. Through the open structure of the negative pressure box 14 facing the sponge rubber roller sleeve A17, the adhesive inside the sponge rubber roller sleeve A17 near the hard rubber roller A16 is further effectively dispersed to the outside of the sponge rubber roller sleeve A17 by the negative pressure. The adhesive sucked out by the negative pressure directly enters the negative pressure box 14. At the same time, adhesive will inevitably remain on the surface of the extrusion roller 6 after it separates from the sponge rubber roller sleeve A17. After the extrusion roller 6 separates from the sponge rubber roller sleeve A17, it continues to rotate downwards through the negative pressure box 14. The adhesive scraped off by the flexible scraper 26 at the top edge of the 4-opening is scraped off by the flexible scraper 26, and the adhesive scraped off the surface of the extrusion roller 6 enters the negative pressure box 14 under the action of negative pressure. The adhesive entering the negative pressure box 14 flows downward along the inner wall of the negative pressure box 14 and under the action of negative pressure, and enters the adhesive collection tank 24 through the connecting pipe 22. The negative pressure device is connected to the negative pressure pipe 23 connected to the adhesive collection tank 24 and maintains the negative pressure in the negative pressure box 24. The adhesive remaining in the adhesive collection tank 24 flows downward along the adhesive collection tank 24 through the adhesive collection pipe 25 and enters the adhesive collection trough 8.

[0052] As the top roller 4 continues to rotate downwards, the adhesive is evenly distributed on the sponge rubber roller sleeve A17 under the negative pressure of the negative pressure box 14. When the top roller 4 rotates to contact the bottom roller 5, the sponge rubber roller sleeve B20 of the bottom roller 5 further squeezes and deforms the sponge rubber roller sleeve A17, and the sponge rubber roller sleeve B20 contacts the hard rubber roller A16 of the top roller 4, thereby squeezing out all the adhesive in the sponge rubber roller sleeve A17 and dispersing it into the sponge rubber roller sleeve B20. The sponge rubber roller sleeve A17 continues to rotate and separates from the sponge rubber roller sleeve B20. The separated sponge rubber roller sleeve A17... Returning to its original state, the adhesive inside the sponge rubber roller sleeve A17 is completely transferred to the outer edge of the sponge rubber roller sleeve B20. After separating from the sponge rubber roller sleeve A17, the sponge rubber roller sleeve B20 continues to rotate until it contacts the adhesive coating guide plate 13. Due to the restoring force of the spring 31, the strip-shaped protrusions on the adhesive coating guide plate 13 squeeze the surface of the sponge rubber roller sleeve B20 at the corresponding position, thereby dispersing the adhesive on the surface of the sponge rubber roller sleeve B20 towards the hard rubber roller B19. The adhesive, after being squeezed by the strip-shaped protrusions on the adhesive coating guide plate 13, is then... The surface of the rubber roller sleeve B20 returns to its original state; the sponge rubber roller sleeve A17, after separating from the sponge rubber roller sleeve B20, continues to rotate until it passes through the rubber pool again, where the rubber liquid in the pool fully wets the sponge rubber roller sleeve A17 again; repeating the above process, the sponge rubber roller sleeve A17 continuously disperses the rubber liquid into the sponge rubber roller sleeve B20, which has returned to its original state after being squeezed by the strip-shaped protrusions on the adhesive coating and feeding guide plate 13, until the sponge rubber roller sleeve B20 is full of rubber liquid. When the sponge rubber roller sleeve B20 is full of rubber liquid, it rotates to contact the adhesive coating and feeding guide plate 13. Upon contact, due to the restoring force of the spring 31, the strip-shaped protrusions on the glue-applying guide plate 13 squeeze the surface of the sponge rubber roller sleeve B20 at the corresponding position, thereby squeezing out excess glue from the surface of the sponge rubber roller sleeve B20. The squeezed-out excess glue flows downward along the bottom surface of the glue-applying guide plate 13 to the glue-guiding vertical plate 32, and continues to flow downward along the glue-guiding vertical plate 32 into the glue collection tank 8. After the surface of the sponge rubber roller sleeve B20, squeezed by the strip-shaped protrusions on the glue-applying guide plate 13, returns to its original state, the remaining glue in the sponge rubber roller sleeve B20 is evenly dispersed.

[0053] Then, one side of the wood veneer extends from one end of the glue-applying inlet 29 of the glue-applying top plate 27 into the space between the glue-applying top plate 27 and the glue-applying guide bottom plate 13, so that the top and bottom surfaces of the wood veneer extending between the glue-applying top plate 27 and the glue-applying guide bottom plate 13 correspond to the glue-applying top roller 4 and the glue-applying bottom roller 5. At this time, under the rotation of the glue-applying top roller 4 and the glue-applying bottom roller 5, the wood veneer is automatically conveyed forward while the top and bottom surfaces of the wood veneer are evenly coated with glue. During the glue-applying process, the glue in the sponge rubber sleeve A17 of the glue-applying top roller 4 is squeezed and applied to the top surface of the wood veneer it passes through, and the glue on the surface of the sponge rubber sleeve B20 of the glue-applying bottom roller 5 is squeezed and applied to the bottom surface of the wood veneer it passes through.

[0054] After one wood veneer is conveyed, and another wood veneer is placed between the glue-feeding top plate 27 and the glue-feeding guide bottom plate 13, the rapidly rotating glue-feeding top roller 4 has already completed at least one cycle of squeezing and transferring the glue onto the surface of the glue-feeding bottom roller 5; thus achieving rapid and continuous glue application to the wood veneer.

[0055] By adjusting the negative pressure force in the negative pressure box 14 and the force of the spring 31 respectively, the amount of glue on the surface of the sponge rubber roller sleeve A17 and the amount of glue on the sponge rubber roller sleeve B20 can be adjusted, thereby adjusting the amount of glue applied to the top and bottom surfaces of the wood veneer.

Claims

1. A double-sided wood veneer gluing machine, characterized in that: The system includes a gantry frame (1), in which a set of glue-applying rollers is provided in the middle. The glue-applying rollers include a top glue-applying roller (4) and a bottom glue-applying roller (5) arranged vertically and in parallel. The bottom surface of the top glue-applying roller (4) and the top surface of the bottom glue-applying roller (5) are in contact. Inside the gantry frame (1), on one side of the top glue-applying roller (4), a glue-squeezing roller (6) is also provided in parallel. The glue-squeezing roller (6) is in contact with the opposing surfaces of the top glue-applying roller (4). The top roller (4) is connected to the bottom roller (5) and the extrusion roller (6) via a drive motor. A glue-gathering groove is formed in the upper area between the top roller (4) and the extrusion roller (6). The contact surfaces of the top roller (4) and the extrusion roller (6) rotate downwards at the same linear speed. The contact surfaces of the top roller (4) and the bottom roller (5) rotate away from the extrusion roller (6) at the same linear speed. The top roller (4) rotates from the inside out. A rigid core roller A (15), a hard rubber roller sleeve A (16), and a sponge rubber roller sleeve A (17) are coaxially fixed in sequence. The glue-applying bottom roller (5) is coaxially fixed from the inside to the outside with a rigid core roller B (18), a hard rubber roller B (19), and a sponge rubber roller sleeve B (20). The hardness of the sponge rubber roller sleeve B (20) is greater than that of the sponge rubber roller sleeve A (17). The side of the extrusion roller (6) facing the glue-applying top roller (4) is connected to the sponge rubber roller sleeve A. (17) The sponge rubber roller sleeve B (20) is squeezed to contact the hard rubber roller A (16) and there is a gap between the sponge rubber roller sleeve B (20) and the side facing the top roller (4) of the glue coating. The sponge rubber roller sleeve A (17) is squeezed to contact the hard rubber roller A (16). The gantry frame (1) is also fixedly provided with a glue collection groove (8) below the bottom roller (5). The top roller (4), the bottom roller (5) and the extrusion roller (6) are all located directly above the range of the glue collection groove (8).

2. The wood veneer double-sided gluing machine as described in claim 1, characterized in that: When the sponge rubber roller sleeve B (20) presses the sponge rubber roller sleeve A (17) against the side facing the glue-coating top roller (4) until it contacts the hard rubber roller A (16), the remaining thickness of the sponge rubber roller sleeve B (20) on the side that is pressed and in contact with the hard rubber roller A (16) is still greater than or equal to the thickness of the wood veneer being glued.

3. The wood veneer double-sided gluing machine as described in claim 1, characterized in that: Inside the gantry frame (1), on one side of the extrusion roller (6) located between the top roller (4) and the bottom roller (5), there is also a glue feeding guide plate (13). The bottom edge of the glue feeding guide plate (13) away from the bottom roller (5) is swayed and connected to the gantry frame (1) by a hinge (28). The edge of the glue feeding guide plate (13) facing the bottom roller (5) is pressed and placed on the upper surface of the bottom roller (5) facing the extrusion roller (6). The hinge (28) is set parallel to the axis of the bottom roller (5).

4. The wood veneer double-sided gluing machine as described in claim 3, characterized in that: The adhesive coating and feeding guide plate (13) is connected to the gantry (1) through a spring (31) with a pre-acting force. The restoring force of the spring (31) causes the adhesive coating and feeding guide plate (13) to squeeze the sponge rubber roller sleeve B (20) it contacts.

5. The wood veneer double-sided gluing machine as described in claim 4, characterized in that: The bottom edge of the adhesive coating guide plate (13) that contacts the sponge rubber roller sleeve B (20) also has a strip-shaped protrusion along the side edge.

6. The wood veneer double-sided gluing machine as described in claim 3, characterized in that: The bottom of the glue-applying guide plate (13) is also provided with a glue-guiding plate (32) which is parallel to the axis of the glue-applying roller (5), and the bottom of the glue-guiding plate (32) extends downward into the glue collection trough (8).

7. The wood veneer double-sided gluing machine as described in claim 3, characterized in that: A negative pressure box (14) is fixedly installed inside the gantry frame (1) between the glue coating and feeding guide plate (13) and the extrusion roller (6). The negative pressure box (14) extends to the area below the glue coating top roller (4) and the extrusion roller (6) where they are in contact. The negative pressure box (14) is open at the area where the glue coating top roller (4) and the extrusion roller (6) are in contact. The edge of the open opening facing the glue coating top roller (4) is set along the surface of the glue coating top roller (4) and there is a gap between it and the glue coating top roller (4). A flexible scraper (26) is fixed on the top edge of the open opening facing the extrusion roller (6). The bottom edge of the flexible scraper (26) is fixed to the inner wall of the negative pressure box (14). The top edge of the flexible scraper (26) is in contact with the lower surface of the extrusion roller (6). The bottom of the negative pressure box (14) is provided with a connecting pipe (22) that is connected to the negative pressure pipe (23).

8. The wood veneer double-sided gluing machine as described in claim 7, characterized in that: The bottom plates of the glue-applying guide plate (13) and the negative pressure box (14) are both inclined downwards in the direction away from the glue-applying bottom roller (5), and the bottom plate of the negative pressure box (14) extends downwards from the edge away from the glue-applying top roller (4) with a glue-applying guide plate (27). The distance between the glue-applying guide plate (27) and the glue-applying guide plate (13) increases in the direction away from the glue-applying top roller (4).

9. The wood veneer double-sided gluing machine as described in claim 8, characterized in that: The connecting pipes (22) are symmetrically arranged at the bottom of the two side walls of the negative pressure box (14) on the side where the glue feeding guide plate (27) is located. The negative pressure pipes (23) are respectively inserted through and fixed to the corresponding side plates (2) of the gantry frame (1). The end of the connecting pipe (22) away from the negative pressure box (14) and the end of the negative pressure pipe (23) inside the gantry frame (1) extend downward from the top of the glue collection tank (24) into the glue collection tank (24). The glue collection tank (24) is fixed to the side plate (2). The bottom of the glue collection tank (24) is respectively connected to the glue collection pipe (25). The bottom end of the glue collection pipe (25) extends downward to below the glue liquid surface in the glue collection tank (8).

10. The wood veneer double-sided gluing machine as described in claim 1, characterized in that: The bottom of the glue collection tank (8) is connected to a downwardly arranged glue discharge pipe (9). The bottom of the glue discharge pipe (9) is provided with a glue discharge valve (10). One side of the glue discharge pipe (9), above the glue discharge valve (10), is connected to the inlet of the liquid pump (11). The outlet of the liquid pump (11) is connected to the glue supply pipe (12). The gantry frame (1) is located directly above the glue collection tank and is fixedly arranged along the glue collection tank. The end of the glue supply pipe (12) away from the liquid pump (11) extends downward into the top of the glue collection tank (7). The bottom of the glue collection tank (7) is provided with a glue dripping pipe (21). The lower opening of the glue dripping pipe (21) is a strip tube arranged in the direction of extension of the glue collection tank. The bottom opening of the glue dripping pipe (21) is a strip hole arranged in the direction of extension of the glue collection tank. The two ends of the strip hole are located at the corresponding end positions within the range of the glue collection tank, and the length of the strip hole is less than the length of the glue collection tank.

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