A veneer jointing machine for plywood production

Abstract

The present application relates to a kind of veneer production veneer jointer, mobile frame bottom rotation is equipped with work support, hot melt nozzle is set on work support, the bottom of work support is also hinged with press roll connecting rod, the bottom of press roll connecting rod is rotationally equipped with press roll;Mobile frame is rotationally equipped with transmission shaft, the rotation axis of transmission shaft is arranged with the rotation axis of work support collinearly, transmission shaft is drivingly connected with driving motor, transmission shaft is fixed with the first bevel gear of transmission shaft in work support, work support is rotationally equipped with the support bevel gear with the hinge axis of hot melt nozzle axis parallel arrangement, support bevel gear is meshed with transmission shaft first bevel gear transmission, support bevel gear is connected with hot melt nozzle by connecting rod mechanism and is hinged to drive hot melt nozzle to reciprocating swing when support bevel gear carries out circumferential rotary motion.The present application solves the technical problem in the prior art that veneer jointer can only be jointed in a single direction and affects the jointing efficiency of the whole machine.

Description

Technical Field

[0001] This invention relates to plywood production and processing equipment, and more particularly to a veneer splicing machine for plywood production. Background Technology

[0002] Plywood is made by gluing and hot pressing multiple layers of boards together, and each layer of plywood is made by gluing and splicing veneers together.

[0003] There are basically two types of veneer adhesive splicing. One is seamless splicing, which involves directly applying water-soluble or hot-melt adhesive to the side of the veneer, and then using the heated extrusion roller of the splicing machine to forcefully push and press the edges of the two veneers together. Under heating, the side adhesive is quickly cured, forming a joint that is almost invisible.

[0004] Another type is wired splicing, which utilizes high-strength hot melt adhesive threads. These threads include a central reinforcing thread made of glass fiber or industrial yarn, and an adhesive bonded to the periphery of the central reinforcing thread. In use, when the edges of two adjacent veneers are brought close together, the hot melt adhesive threads are ejected from a heating nozzle. The nozzle heats the threads, melting the adhesive around the central reinforcing thread. As the nozzle moves along the length of the splice, it oscillates back and forth, creating a zigzag (S-shaped) trajectory across the splice. Then, a cooling roller presses the molten adhesive, rapidly solidifying it and tightening the two veneers. This wired splicing method features high tensile strength and is suitable for splicing thicker middle or core veneers.

[0005] The existing veneer splicing machine for wired seams has a problem: due to the arrangement of the condensing roller and heating nozzle (the heating nozzle has a certain orientation, not vertically downward), the heating nozzle and condensing roller can only move in one direction to achieve splicing. For example, if the length of the seam extends in the left-right direction, the condensing roller is located to the left of the heating nozzle, and the heating nozzle can only move from left to right along the seam. When it reaches the right end of the seam, the hot melt adhesive thread needs to be cut, and then the heating nozzle is moved to the left end of the veneer again to move from left to right for the next seam. This process affects the splicing efficiency. Summary of the Invention

[0006] The purpose of this invention is to provide a veneer splicing machine for plywood production, which solves the technical problem in the prior art that veneer splicing machines can only splice in a single direction, thus affecting the overall splicing efficiency of the machine.

[0007] The technical solution of the present invention is as follows: A veneer splicing machine for plywood production includes a frame, a frame beam extending laterally on the frame, a hot melt nozzle movable laterally along the frame beam, and a veneer conveying table on the frame for conveying veneers from back to front. A movable frame is mounted on the frame beam and guided to move in the left and right directions. The movable frame is equipped with a drive motor for moving the movable frame left and right. The bottom of the mobile frame is rotatably equipped with a working bracket whose rotation axis extends in the vertical direction. The hot melt nozzle is set on the working bracket, and the working bracket is also equipped with a glue-dispensing roller for winding hot melt adhesive threads. The hot melt nozzle is hinged to the working bracket, and the hinge axis of the hot melt nozzle extends in the horizontal direction. The bottom of the working bracket is also hinged with a pressure roller connecting rod, and the bottom of the pressure roller connecting rod is rotatably equipped with a pressure roller for rolling the hot melt adhesive threads at the joint. A locking mechanism is provided between the working support and the movable frame for locking the working support after it has rotated 180° relative to the movable frame; A drive shaft is rotatably mounted on the movable frame. The rotation axis of the drive shaft is collinear with the rotation axis of the working support. The drive shaft is connected to the drive motor. A first bevel gear of the drive shaft is fixed on the drive shaft and located inside the working support. A support bevel gear is rotatably mounted on the working support, with its axis arranged parallel to the hinge axis of the hot melt nozzle. The support bevel gear meshes with the first bevel gear of the drive shaft. The support bevel gear is hinged to the hot melt nozzle through a linkage mechanism so as to drive the hot melt nozzle to reciprocate when the support bevel gear performs circumferential rotation.

[0008] According to claim 1, a veneer splicing machine for plywood production is characterized in that nozzle hinge shafts are fixed on the left and right sides of the hot melt nozzle and are hinged to the working support; the linkage mechanism includes a first connecting rod fixedly connected to the bevel gear of the support along the same axis and a third connecting rod fixedly connected to the nozzle hinge shaft along the same axis; the linkage mechanism also includes a second connecting rod connected between the first connecting rod and the third connecting rod, one end of the second connecting rod being hinged to the first connecting rod and the other end of the second connecting rod being hinged to the third connecting rod.

[0009] According to claim 1, a veneer splicing machine for plywood production is characterized in that: a glue-dispensing roller bracket is fixed on the working support, the glue-dispensing roller bracket includes a glue-dispensing roller mounting arm suspended above the hot melt nozzle, and the glue-dispensing roller is rotatably mounted on the glue-dispensing roller mounting arm.

[0010] Furthermore, the bottom of the movable frame is provided with a push surface surrounding the working support, and the locking mechanism includes electric push rods evenly spaced around the working support in the circumferential direction. The electric push rods are vertically arranged, and a friction locking plate for contacting and engaging with the push surface is fixed on the actuating rod of the electric push rod.

[0011] Furthermore, a return spring is provided between the pressure roller connecting rod and the working support.

[0012] Furthermore, a second bevel gear of the transmission shaft is fixed on the transmission shaft and located inside the movable frame. The power output end of the drive motor is connected to a motor shaft bevel gear whose axis extends in the left-right direction. The motor shaft bevel gear meshes with the second bevel gear of the transmission shaft for transmission.

[0013] Furthermore, a third bevel gear is fixed on the upper side of the second bevel gear on the drive shaft, and a bevel gear extending along the front-back direction on the moving frame is rotatably mounted on the moving frame. The moving frame bevel gear meshes with the third bevel gear on the drive shaft for transmission. A traveling gear is fixed coaxially on the third bevel gear on the drive shaft, and a crossbeam rack extending in the left-right direction is fixed on the frame crossbeam for transmission with the bottom of the traveling gear.

[0014] Furthermore, the upper end of the mobile frame is guided and moved by the frame beam through the traveling wheels.

[0015] The beneficial effects of this application are as follows: To more clearly illustrate the problem, three adjacent panels are defined as the front panel, middle panel, and rear panel. In use, the joint between the middle panel and the front panel is first constructed. The locking mechanism locks the working support and the moving frame. At this time, the working support and the moving frame act as a single unit, and the working support cannot rotate relative to the moving frame. The power of the drive motor is used to move the moving frame from left to right, and simultaneously, the power of the drive motor can also cause the hot melt nozzle to swing back and forth. Thus, during the movement of the moving frame from left to right, the "cycloidal" operation of the joint between the middle panel and the front panel is completed. When the moving frame moves to the right end of the joint, the locking between the working support and the moving frame is released, and only the working support needs to be rotated... When the support rotates 180°, the orientation of the hot melt nozzle and the layout of the pressure roller and the hot melt nozzle change. The pressure roller is located to the right of the hot melt nozzle. Since the axis of the drive shaft coincides with the axis of the working support, and the first bevel gear of the drive shaft meshes with the bevel gear of the support, even after the working support rotates 180°, the first bevel gear of the drive shaft and the bevel gear of the support are still meshed and can still maintain normal transmission. Then the locking structure locks the working support and the moving frame, and the working support and the moving frame become a whole again. The moving frame carries the hot melt nozzle from right to left to complete the splicing between the middle single board and the rear single board. During the posture change, the hot melt glue thread can be left uncut (or cut), realizing bidirectional splicing and improving splicing efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a structure according to an embodiment of the present invention; Figure 2 for Figure 1 A schematic diagram showing the connection between the moving frame and the working support; Figure 3 for Figure 2 A schematic diagram showing the connection between the moving frame and the frame beam; Figure 4 This is a schematic diagram of the cooperation between the single board and the single board conveyor table in the top view of the present invention; Figure 5 This is a schematic diagram of the linkage mechanism in this invention; In the diagram: 1. Crossbeam rack; 2. Frame crossbeam; 3. Moving frame; 4. Drive motor; 5. Electric push rod; 6. Working support; 7. Pressure roller; 8. Hot melt nozzle; 9. Single board; 10. Conveyor belt; 11. Conveyor belt support plate; 12. Support plate spring; 13. Conveyor roller; 14. Single board conveyor table; 15. Moving frame bevel gear; 16. Third bevel gear of drive shaft; 17. Motor shaft bevel gear; 18. Second bevel gear of drive shaft; 19. Drive shaft; 20. First bevel gear of drive shaft 21. Linkage mechanism; 22. Bracket bevel gear; 23. Friction locking plate; 24. Glue dispensing roller; 25. Nozzle hinge shaft; 26. Glue dispensing roller bracket; 27. Hot melt glue filament; 28. Outlet end of hot melt nozzle; 29. ​​Pressure roller connecting rod; 30. Return spring; 31. Traveling gear; 32. Ventilation and heat dissipation holes; 33. Traveling wheel; 34. Track of hot melt glue filament; 35. Worktable; 36. First connecting rod; 37. Second connecting rod; 38. Third connecting rod; 39. Shaft of bracket bevel gear. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention; that is, the described embodiments are merely some embodiments of the invention, and not all embodiments. The components of the embodiments of the invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0018] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0019] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0020] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0021] A specific embodiment of a veneer splicing machine for plywood production according to the present invention is as follows: Figures 1-5 As shown, The system includes a frame with a frame beam 2 extending in the left-right direction, and a hot melt nozzle 8 that can move left and right along the frame beam 2. The frame is equipped with a single board conveyor table 14 for conveying single boards 9 from back to front. A worktable 35 is provided on the front side of the single board conveyor table 14. After the single boards 9 are joined on the single board conveyor table 14, they can be conveyed to the worktable 35 from back to front.

[0022] In this embodiment, the single-board conveyor table 14 has a conveyor belt 10 structure, which includes conveyor rollers 13 arranged at intervals and a conveyor belt 10 wound around the conveyor rollers 13. A conveyor belt support plate 11 is provided at the bottom of the upper conveyor belt 10. The upper end of the conveyor belt support plate 11 is in sliding contact with the conveyor belt 10, and the bottom of the conveyor belt support plate 11 is floatingly provided by a support plate spring 12. The conveyor belt support plate 11 allows the upper conveyor belt 10 to provide planar support for the single board 9. The single-board conveyor table 14 can move the single board 9 from back to front in a step-by-step manner.

[0023] A movable frame 3 is mounted on the frame beam 2 and guided to move in the left and right directions. The movable frame 3 is equipped with a drive motor 4 for moving the movable frame 3 left and right. In this embodiment, the upper end of the movable frame 3 is guided to move in the left and right directions with the frame beam 2 through the traveling wheel 33. A vertical beam is provided on one side of the frame beam 2, and a support beam is provided at the bottom of the vertical beam. A crossbeam rack 1 arranged in the left and right directions is fixed at the upper end of the support beam.

[0024] The bottom of the movable frame 3 is rotatably equipped with a working support 6 whose rotation axis extends in the vertical direction. The hot melt nozzle 8 is set on the working support 6. The working support 6 is also equipped with a glue-dispensing roller 24 for winding the hot melt adhesive filament 27. The hot melt nozzle 8 is hinged to the working support 6. The hinge axis of the hot melt nozzle 8 extends in the horizontal direction. The bottom of the working support 6 is also hinged with a pressure roller connecting rod 29. The bottom of the pressure roller connecting rod 29 is rotatably equipped with a pressure roller 7 for rolling the hot melt adhesive filament 27 at the joint.

[0025] A reset spring 30 is provided between the pressure roller connecting rod 29 and the working support 6, as shown in Figure 2. When the moving frame 3 moves from left to right, the pressure roller connecting rod 29 is inclined from right to left, and the outlet end 28 of the hot melt nozzle is inclined from right to left. The hot melt nozzle 8 is heated by an electric heating wire. When the hot melt adhesive filament 27 passes through the hot melt nozzle 8, the adhesive around the hot melt adhesive filament 27 can be heated and melted. The heating and melting mechanism of the hot melt adhesive filament 27 is existing technology and will not be described in detail here.

[0026] A glue-dispensing roller bracket 26 is fixed on the working bracket 6. The glue-dispensing roller bracket 26 includes a glue-dispensing roller mounting arm suspended above the hot melt nozzle 8. The glue-dispensing roller 24 is rotatably mounted on the glue-dispensing roller mounting arm.

[0027] A locking mechanism is provided between the working support 6 and the movable frame 3 for locking the working support 6 after it rotates 180° relative to the movable frame 3. In this embodiment, the bottom of the movable frame 3 is provided with a pushing surface surrounding the working support 6. The locking mechanism includes electric push rods 5 evenly spaced around the periphery of the working support 6. The electric push rods 5 are vertically arranged, and a friction locking plate 23 for contacting and engaging with the pushing surface is fixed on the actuating rod of the electric push rod 5. When the actuating rod of the electric push rod 5 extends, the upper end of the friction locking plate 23 contacts the pushing surface at the bottom of the movable frame 3, and the working support 6 cannot rotate relative to the movable frame 3 at this time. When the actuating rod of the electric push rod 5 retracts, the friction locking plate 23 disengages from the pushing surface at the bottom of the movable frame 3, and the working support 6 can rotate relative to the movable frame 3. The operator can manually push the working support 6 to rotate 180° to achieve posture adjustment. Of course, in other embodiments of the present invention, the 180° rotation of the working support 6 can also be achieved by a rotary motor.

[0028] A drive shaft 19 is rotatably mounted on the movable frame 3. The rotation axis of the drive shaft 19 is collinear with the rotation axis of the working bracket 6. The drive shaft 19 is connected to the drive motor 4. A first bevel gear 20 located inside the working bracket 6 is fixed on the drive shaft 19. A bracket bevel gear 22 with its axis parallel to the hinge axis of the hot melt nozzle 8 is rotatably mounted on the working bracket 6. The bracket bevel gear 22 meshes with the first bevel gear 20 of the drive shaft. The bracket bevel gear 22 is hinged to the hot melt nozzle 8 through a linkage mechanism 21 so as to drive the hot melt nozzle 8 to reciprocate when the bracket bevel gear 22 performs circumferential rotation.

[0029] In this embodiment, nozzle hinge shafts 25, which are hinged to the working bracket 6, are fixed on the left and right sides of the hot melt nozzle 8. The linkage mechanism 21 includes a first link 36, which is fixedly connected to the bracket bevel gear 22 on the same axis, and a third link 38, which is fixedly connected to the nozzle hinge shaft 25 on the same axis. The linkage mechanism 21 also includes a second link 37 connected between the first link 36 and the third link 38. One end of the second link 37 is hinged to the first link 36, and the other end of the second link 37 is hinged to the third link 38.

[0030] A second bevel gear 18 is fixed on the drive shaft 19 and located inside the movable frame 3. The power output end of the drive motor 4 is connected to a motor shaft bevel gear 17 whose axis extends in the left-right direction. The motor shaft bevel gear 17 meshes with the second bevel gear 18 of the drive shaft for transmission. A third bevel gear 16 is fixed on the drive shaft 19 above the second bevel gear 18. A movable frame bevel gear 15 with its rotation axis extending in the front-back direction is rotatably mounted on the movable frame 3. The movable frame bevel gear 15 meshes with the third bevel gear 16 of the drive shaft for transmission. A traveling gear 31 is fixed coaxially on the third bevel gear 16 of the drive shaft. A crossbeam rack 1 extending in the left-right direction and meshing with the bottom of the traveling gear 31 is fixed on the frame crossbeam 2.

[0031] The power of the drive motor 4 is transmitted to the second bevel gear 18 of the transmission shaft via the motor shaft bevel gear 17, and then to the transmission shaft 19. It is then transmitted to the travel gear 31 via the third bevel gear 16 of the transmission shaft, enabling the moving frame 3 to move left and right along the frame beam 2. The power of the transmission shaft 19 can be transmitted to the support bevel gear 22 via the first bevel gear 20 of the transmission shaft. The support bevel gear 22, through the linkage mechanism 21, causes the nozzle hinge shaft 25, i.e., the hot melt nozzle 8, to reciprocate. In this invention, the transmission shaft 19 is coaxially arranged with the working support 6, and the bevel gear engagement between the first bevel gear 20 of the transmission shaft and the support bevel gear 22 ensures that even after the working support 6 rotates 180°, the power of the drive motor 4 can still be smoothly transmitted to the support bevel gear 22, thus enabling the normal reciprocating oscillation of the hot melt nozzle 8.

[0032] To clarify the issue, we define three adjacent panels as the front panel, middle panel, and rear panel. In use, the joint between the middle panel and the front panel is first constructed. The locking mechanism locks the working support 6 and the moving frame 3. At this point, the working support 6 and the moving frame 3 function as a single unit, and the working support 6 cannot rotate relative to the moving frame 3. The power of the drive motor 4 is used to move the moving frame 3 from left to right, and simultaneously, the power of the drive motor 4 can also cause the hot melt nozzle 8 to swing back and forth. During the movement of the moving frame 3 from left to right, the trajectory 34 of the hot melt adhesive thread between the middle panel and the front panel is "cycloided." The pressure roller 7 serves two purposes: firstly, the pressure roller 7 is made of metal, which has a lower temperature, facilitating rapid solidification of the molten adhesive; secondly, the pressure roller 7 applies pressure to the adhesive, facilitating its penetration into the panel 9. The pressure roller 7 itself is existing technology and will not be described in detail here. The difference between this invention and existing technology is that the pressure roller 7 is mounted on a rotatable working support 6. When the moving frame 3 moves to the right end of the seam, the lock between the working support 6 and the moving frame 3 is released. Simply rotate the working support 6 180°. At this time, the orientation of the hot melt nozzle 8 and the layout of the pressure roller 7 and the hot melt nozzle 8 change. The pressure roller 7 is located to the right of the hot melt nozzle 8. Since the axis of the drive shaft 19 coincides with the axis of the working support 6, and the first bevel gear 20 of the drive shaft meshes with the bevel gear 22 of the support, even after the working support 6 rotates 180°, the first bevel gear 20 of the drive shaft and the bevel gear 22 of the support are still meshed and can still maintain normal transmission. Then the locking structure locks the working support 6 and the moving frame 3, and the working support 6 and the moving frame 3 become a whole again. The moving frame 3 carries the hot melt nozzle 8 from right to left to complete the seam between the middle single board and the rear single board. During the posture change, the hot melt adhesive thread 27 can be left uncut (or cut), realizing bidirectional seam reciprocation and improving seam efficiency.

[0033] In the diagram, item 32 represents a ventilation and heat dissipation hole; item 39 represents the shaft of the bevel gear of the support.

[0034] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present invention shall also be included within the scope of protection of the present invention.

Claims

1. A veneer splicing machine for plywood production, comprising a frame, a frame beam extending laterally on the frame, and a hot melt nozzle movable laterally along the frame beam, characterized in that: The frame is equipped with a PCB conveyor for transporting PCBs from back to front. A movable frame is mounted on the frame beam and guided to move in the left and right directions. The movable frame is equipped with a drive motor for moving the movable frame left and right. The bottom of the mobile frame is rotatably equipped with a working bracket whose rotation axis extends in the vertical direction. The hot melt nozzle is set on the working bracket, and the working bracket is also equipped with a glue-dispensing roller for winding hot melt adhesive threads. The hot melt nozzle is hinged to the working bracket, and the hinge axis of the hot melt nozzle extends in the horizontal direction. The bottom of the working bracket is also hinged with a pressure roller connecting rod, and the bottom of the pressure roller connecting rod is rotatably equipped with a pressure roller for rolling the hot melt adhesive threads at the joint. A locking mechanism is provided between the working support and the movable frame for locking the working support after it has rotated 180° relative to the movable frame; A drive shaft is rotatably mounted on the movable frame. The rotation axis of the drive shaft is collinear with the rotation axis of the working support. The drive shaft is connected to the drive motor. A first bevel gear of the drive shaft is fixed on the drive shaft and located inside the working support. A support bevel gear is rotatably mounted on the working support, with its axis arranged parallel to the hinge axis of the hot melt nozzle. The support bevel gear meshes with the first bevel gear of the drive shaft. The support bevel gear is hinged to the hot melt nozzle through a linkage mechanism so as to drive the hot melt nozzle to reciprocate when the support bevel gear performs circumferential rotation.

2. The veneer splicing machine for plywood production according to claim 1, characterized in that, The hot melt nozzle has nozzle hinge shafts fixed on its left and right sides and hinged to the working support. The linkage mechanism includes a first link fixedly connected to the support bevel gear on the same axis and a third link fixedly connected to the nozzle hinge shaft on the same axis. The linkage mechanism also includes a second link connected between the first link and the third link. One end of the second link is hinged to the first link and the other end of the second link is hinged to the third link.

3. The veneer splicing machine for plywood production according to claim 1, characterized in that: A glue-dispensing roller bracket is fixed on the working support. The glue-dispensing roller bracket includes a glue-dispensing roller mounting arm suspended above the hot melt nozzle. The glue-dispensing roller is rotatably mounted on the glue-dispensing roller mounting arm.

4. A veneer splicing machine for plywood production according to claim 1, characterized in that: The bottom of the movable frame is provided with a push surface that is arranged around the periphery of the working support. The locking mechanism includes electric push rods that are evenly distributed around the periphery of the working support in the circumferential direction. The electric push rods are arranged vertically, and a friction locking plate for contacting and cooperating with the push surface is fixed on the actuating rod of the electric push rod.

5. The veneer splicing machine for plywood production according to claim 1, characterized in that: A reset spring is installed between the pressure roller connecting rod and the working support.

6. The veneer splicing machine for plywood production according to any one of claims 1 to 5, characterized in that: A second bevel gear is fixed on the drive shaft and located inside the movable frame. The power output end of the drive motor is connected to a motor shaft bevel gear whose axis extends in the left and right direction. The motor shaft bevel gear meshes with the second bevel gear of the drive shaft for transmission.

7. The veneer splicing machine for plywood production according to claim 6, characterized in that: A third bevel gear is fixed on the upper side of the second bevel gear on the drive shaft. A bevel gear with its rotation axis extending in the front-back direction is rotatably mounted on the moving frame. The bevel gear of the moving frame meshes with the third bevel gear of the drive shaft for transmission. A traveling gear is fixed coaxially on the third bevel gear of the drive shaft. A crossbeam rack extending in the left-right direction and meshing with the bottom of the traveling gear is fixed on the frame crossbeam.

8. The veneer splicing machine for plywood production according to claim 7, characterized in that: The upper end of the mobile frame is guided and moved by the crossbeam of the frame via wheels.

Images