A continuous glue-keeping method for avoiding plastic deformation of special-shaped beam

Abstract

The application discloses a continuous gluing and pressure maintaining method for avoiding plastic deformation of a special-shaped beam, which comprises the following steps: providing continuous pressure on different parts of a plurality of single boards which have been coated with glue and are to be glued by a plurality of continuous gluing and pressure maintaining mechanisms; gradually making each part of the plurality of single boards reach a proper bending curvature of the special-shaped beam; and continuously maintaining pressure on the plurality of single boards for a period of time, so that the plurality of single boards are glued and the special-shaped beam with a certain bending curvature is formed. The application is based on the elastic deformation of wood, adjusts a locking and pressing device, and makes a pressing base provide suitable and stable pressure for the special-shaped beam plywood forming, so that the percentage of defective products is reduced and the quality of the special-shaped beam is improved.

Description

Technical Field

[0001] This invention relates to the field of plywood press technology, specifically a continuous bonding and pressure-holding method to prevent plastic deformation of irregularly shaped beams. Background Technology

[0002] Multi-layer gluing bending forming process involves assembling multiple layers of thin rotary veneers, molding, and heating to form the blank. This process is simple to operate, highly efficient, technically advanced, produces high mechanical strength, and results in smooth curved surfaces. It is suitable for small-batch, multi-variety bentwood production. Multi-layer gluing bentwood is made by laminating multiple layers of veneers together, which solves the problem of poor bending performance of wood, greatly increasing its curvature. It is a commonly used process in furniture factories for making bentwood.

[0003] Current traditional plywood presses include a tie rod, wedge pins, a pressure seat, and a support column. The tie rod passes through a gap between the pressure seat and the support column. The wedge pin is inserted into a hole in the tie rod and abuts against the side of the pressure seat. The bonding pressure method of this traditional plywood press is as follows: pulling the tie rod moves the wedge pin, which pushes the pressure seat, which then presses down on multiple veneers to be glued. The veneers are clamped between the pressure seat and the support column. During use, it was found that traditional gluing pressure methods are difficult to provide suitable and continuous pressure for veneers of different materials and irregularly shaped beams with varying degrees of curvature due to factors such as veneer thickness, moisture content, surface roughness, and unit pressure. Specifically, if the wedge pin is inserted too tightly into the hole of the pressure strip, the pressure will be too high, causing plastic deformation of the veneer; if the wedge pin is inserted too loosely, the pressure will be too low, resulting in poor veneer forming. The wedge pin is also easily squeezed out of the hole of the pressure strip during the veneer gluing and forming process (i.e., when pulling the pressure strip). This leads to a high defect rate and low quality of the finished plywood products with irregularly shaped beams. To address the above problems, a new continuous gluing pressure-maintaining method is proposed to avoid plastic deformation of irregularly shaped beams. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a continuous gluing and pressure-holding method and apparatus for avoiding plastic deformation of irregular beams, which addresses the shortcomings of the prior art. This method can provide suitable and continuous pressure to multiple veneers to be glued, gradually making each part of the multiple veneers achieve the required curvature of the irregular beam. After the multiple veneers are continuously pressed for a period of time, the gluing of the multiple veneers is completed, and an irregular beam with a certain curvature is formed; at the same time, it achieves the purpose of avoiding plastic deformation of the irregular beam and improving the quality of the irregular beam.

[0005] To achieve the above-mentioned technical objectives, the technical solution adopted by the present invention is as follows:

[0006] A continuous gluing and pressure-holding method to avoid plastic deformation of irregular beams involves multiple continuous gluing and pressure-holding mechanisms applying continuous pressure to different parts of multiple veneers that have been coated with glue and are to be glued; gradually bringing each part of the multiple veneers to the required curvature of the irregular beam; after the multiple veneers are continuously pressed for a period of time, the gluing of the multiple veneers is completed, forming an irregular beam plywood with a certain curvature;

[0007] The single continuous bonding and pressure holding mechanism includes a support column, a tie rod, a pressure seat, a rear elastic pin, a front pin, and a retractable lock.

[0008] Specifically, the following steps are included:

[0009] Step 1: Perform the following operations on multiple continuous bonding and pressure holding mechanisms:

[0010] Step 1.1: Adjust the position of the support columns so that the support columns in the multiple continuous bonding and pressure holding mechanisms are arranged along the curvature of the irregular beam; after the position of the support columns is adjusted, keep the position of the support columns fixed.

[0011] Step 1.2: Pass the pull bar through the through gaps in the pressure seat, support column and retractable lock in sequence, insert the rear elastic pin into the rear hole of the pull bar, and make the rear elastic pin abut against one side of the pressure seat.

[0012] Step 1.3: Place multiple veneers that have been coated with glue and are ready to be glued between the pressure base and the support column in the continuous gluing and pressure holding mechanism;

[0013] Step 2: First, pull the pull bar in the continuous gluing and pressure holding mechanism arranged in the middle position. The pull bar drives the rear elastic pin to move. The rear elastic pin pushes the pressure seat to move in the direction of the multiple veneers to be glued. Finally, the pressure seat abuts against the multiple veneers to be glued, and applies pressure to the veneers. This causes the pressure seat and the support column to work together to clamp the multiple veneers to be glued.

[0014] Step 3: Insert the front pin into the front hole of the pull bar mentioned in Step 2, and adjust the telescopic lock to a suitable length so that one end of it abuts against the round pin and the other end abuts against the support column, ensuring that the pressure is evenly distributed and providing uniform and continuous pressure to multiple veneers to be glued.

[0015] Step 4: Following the methods in Steps 2 and 3, operate the remaining continuous gluing and pressure holding mechanisms in sequence, so that the multiple continuous gluing and pressure holding mechanisms provide uniform and continuous pressure to different parts of the multiple veneers to be glued, and make each part of the multiple veneers achieve the bending curvature that the irregular beam should have. After holding the pressure for a period of time, an irregular beam plywood with a certain bending curvature is formed after gluing.

[0016] As a further improved technical solution of the present invention, the single continuous bonding and pressure holding mechanism also includes a slide rail, the bottom of the support column is provided with a base, the base is slidably connected to the slide rail, and a locking mechanism is provided between the base and the slide rail.

[0017] As a further improvement to the present invention, the following steps are included between steps 1.1 and 1.2:

[0018] Step 1.1a: Place the middle part of multiple veneers that have been coated with glue and are to be glued on the upper surface of the base of the support column in the continuous gluing and pressure holding mechanism arranged in the middle position; and the veneer is located between the pressure base and the support column;

[0019] The pull strip in step 1.2 is located above the single panel in step 1.1a;

[0020] Step 1.3 specifically includes:

[0021] Several other veneers that have been coated with glue and are ready to be glued are placed on the upper surface of the tie rods in several continuous gluing and pressure holding mechanisms, with the veneers located between the pressure base and the support column;

[0022] The single board in step 1.3 is located directly above the single board in step 1.1a.

[0023] As a further improvement of the present invention, the pull bar is pulled by a transmission system, the transmission system including a hydraulic cylinder, and the hydraulic rod of the hydraulic cylinder is connected to one end of the pull bar by bolts.

[0024] As a further improved technical solution of the present invention, in the transmission system, a hydraulic sleeve is fixedly connected to the outside of the hydraulic cylinder. The inside of the hydraulic sleeve is a cavity. The hydraulic rod of the hydraulic cylinder is located inside the hydraulic sleeve. One end of the pull bar extends from the opening at one end of the hydraulic sleeve into the inside of the hydraulic sleeve and is connected to the hydraulic rod by bolts. One end of the hydraulic sleeve abuts against the side of the support column facing away from the multiple veneers to be glued.

[0025] As a further improved technical solution of the present invention, a suspension rope slide rail is provided above the multiple continuous bonding and pressure holding mechanisms, and the hydraulic cylinder is slidably connected to the suspension rope slide rail through the suspension rope, and the hydraulic cylinder is swung in the air through the suspension rope;

[0026] Step 2 specifically refers to:

[0027] Move the hydraulic cylinder, manually connect the hydraulic rod of the hydraulic cylinder to the pull bar of the continuous adhesive pressure holding mechanism arranged in the middle position by bolts, and manually press one end of the hydraulic sleeve of the hydraulic cylinder against the side of the support column.

[0028] When the hydraulic cylinder is activated, the hydraulic rod pulls the pull bar, which in turn moves the rear elastic pin. The rear elastic pin then pushes the pressure seat toward the direction where the multiple veneers to be glued are located. Finally, the pressure seat abuts against the multiple veneers to be glued, exerting pressure on the veneers. This causes the pressure seat and the support column to work together to clamp the multiple veneers to be glued.

[0029] Step 4 further includes:

[0030] Disconnect the hydraulic rod of the hydraulic cylinder from the pull bar of the continuous bonding and pressure holding mechanism arranged in the middle position. Then move the hydraulic cylinder and connect the hydraulic rod of the hydraulic cylinder to the pull bars of different continuous bonding and pressure holding mechanisms in sequence from the middle position to the two sides, so as to pull the different pull bars.

[0031] As a further improved technical solution of the present invention, in the continuous bonding and pressure holding mechanism, the retractable lock includes an outer locking sleeve and an inner locking sleeve; the outer locking sleeve and the inner locking sleeve are threadedly connected; the inner locking sleeve is located inside the outer locking sleeve, and the pull bar passes through the inner locking sleeve in the retractable lock, and the retractable lock can extend into the inner side of one end of the hydraulic sleeve on the hydraulic cylinder.

[0032] As a further improved technical solution of the present invention, in the continuous bonding and pressure holding mechanism, the rear elastic pin is an elastic steel square pin, the middle of the elastic steel square pin is provided with a hollow structure, the multiple rear holes opened on the pull bar are square holes, and the elastic steel square pin is inserted into the square holes opened on the pull bar.

[0033] As a further improvement of the present invention, in the continuous bonding and pressure holding mechanism, the front pin is a circular pin, and the multiple front holes on the pull bar are circular holes, with the circular pin inserted into the circular holes on the pull bar.

[0034] As a further improvement of the present invention, in the continuous bonding and pressure holding mechanism, the support column, the pressure seat and the inner locking sleeve of the telescopic lock are all provided with a through gap for the pull bar to pass through.

[0035] As a further improvement of the present invention, a force sensor for measuring the pressure value of a single board is provided on the pressure base. The output of the force sensor is connected to a control device, and the control device controls the hydraulic cylinder to operate according to the pressure value of the single board measured by the force sensor.

[0036] This invention also provides a continuous bonding and pressure holding device to prevent plastic deformation of irregular beams. This device can provide suitable and continuous pressure to multiple veneers to be bonded, gradually making each part of the multiple veneers achieve the bending curvature that the irregular beam should have, and finally the bonding is completed to form an irregular beam with a certain bending curvature; at the same time, it can achieve the purpose of preventing plastic deformation of irregular beams and improving the quality of finished irregular beams.

[0037] To achieve the above objectives, the present invention provides a continuous bonding and pressure holding device for preventing plastic deformation of irregularly shaped beams, comprising multiple continuous bonding and pressure holding mechanisms and a transmission system.

[0038] The continuous bonding and pressure-holding mechanism includes a support column, a tie rod, a pressure seat, a slide rail, and a locking device; the locking device includes a rear elastic pin, a front pin, and a retractable lock.

[0039] The telescopic end of the transmission system is detachably connected to one end of the pull rod in the continuous gluing and pressure holding mechanism. The other end of the pull rod passes through the telescopic lock, the support column, and the pressure seat in sequence. A base is provided at the bottom of the support column, and the base is slidably connected to the slide rail. Multiple veneers that have been coated with glue and are to be glued are placed between the pressure seat and the support column. The rear elastic pin is inserted into the rear hole opened on the pull rod, and the rear elastic pin abuts against the side of the pressure seat facing away from the multiple veneers to be glued. The front pin is inserted into the front hole opened on the pull rod, and the two ends of the telescopic lock abut against the side of the support column facing away from the multiple veneers to be glued and the circular pin, respectively.

[0040] The support columns in the multiple continuous bonding and pressure holding mechanisms are arranged along the curvature of the irregular beam;

[0041] Multiple continuous gluing and pressure holding mechanisms are used to provide continuous pressure to different parts of multiple veneers to be glued, thereby forming a gluing completed irregular beam plywood with a certain curvature.

[0042] As a further improvement to the aforementioned continuous bonding and pressure-holding device, the transmission system includes a hydraulic cylinder, wherein the hydraulic rod of the hydraulic cylinder is bolted to one end of the pull bar.

[0043] As a further improvement to the aforementioned continuous bonding and pressure-holding device, a hydraulic sleeve is fixedly connected to the outside of the hydraulic cylinder. The inside of the hydraulic sleeve is a cavity. The hydraulic rod of the hydraulic cylinder is located inside the hydraulic sleeve. One end of the pull bar extends from the opening at one end of the hydraulic sleeve into the inside of the hydraulic sleeve and is connected to the hydraulic rod by bolts. One end of the hydraulic sleeve abuts against the side of the support column facing away from the multiple veneers to be bonded.

[0044] As a further improvement to the aforementioned continuous bonding and pressure-holding device, the retractable lock is a retractable cylindrical lock, comprising an outer lock sleeve and an inner lock sleeve; the outer lock sleeve and the inner lock sleeve are threaded together; the inner lock sleeve is located inside the outer lock sleeve, and a pull bar passes through the inner lock sleeve in the retractable lock.

[0045] As a further improvement to the aforementioned continuous bonding and pressure-holding device, the retractable lock is located inside one end of the hydraulic jacket.

[0046] As a further improvement to the above-mentioned continuous bonding and pressure holding device, the rear elastic pin is an elastic steel square pin, and the center of the elastic steel square pin has a hollow structure that penetrates the upper and lower surfaces. The multiple rear holes on the pull bar are square holes, and the elastic steel square pin is inserted into the square holes on the pull bar.

[0047] As a further improvement to the aforementioned continuous bonding and pressure-holding device, the front pin is a circular pin, and the multiple front holes on the pull bar are circular holes, with the circular pin inserted into the circular holes on the pull bar.

[0048] As a further improvement to the aforementioned continuous bonding and pressure-holding device, the support column, pressure seat, and inner locking sleeve of the retractable lock are all provided with a through gap for the pull bar to pass through.

[0049] As a further improvement to the aforementioned continuous bonding and pressure-holding device, a locking mechanism is provided between the base at the bottom of the support column and the slide rail.

[0050] As a further improvement to the above-mentioned continuous bonding and pressure holding device, the pressure base is equipped with a force sensor for measuring the pressure value of the veneer. The force sensor is connected to a control device, which controls the hydraulic cylinder to work based on the pressure value of the veneer detected by the force sensor.

[0051] Compared with the prior art, the beneficial effects of the present invention are:

[0052] This continuous gluing and pressure-holding method, which avoids plastic deformation of irregularly shaped beams, can adjust the retractable lock according to the elastic deformation of the corresponding wood, so that the pressure seat provides appropriate pressure for the forming of irregularly shaped beam plywood, reducing the defect rate of finished products and improving the quality of irregularly shaped beams. The position between the base of the support column and the slide rail can be changed according to the different curvature of the irregularly shaped beam. Different positions of the support column on the slide rail can produce irregularly shaped beam plywood with different curvatures.

[0053] This invention, based on existing technology, replaces the wedge-shaped pin with a flexible steel square pin. Due to the material and hollow structure of the flexible steel square pin, it deforms under pressure. This deformation translates into a uniform and gradually increasing supporting force on the pressure seat, slowly applying pressure to the veneer. This further prevents plastic deformation caused by rapidly applying excessive pressure. Finally, the positions of the flexible steel square pin and the pressure seat are locked by a telescopic cylindrical lock and a circular pin, stabilizing the pressure. At this point, the supporting force of the flexible steel square pin is sufficient to support the pressure seat and provide effective gluing pressure to the veneer without being too large, causing plastic deformation of the veneer. This ensures the gluing quality and uniformity of the irregular beam, resulting in uniform internal stress in the structural wood product and further improving its mechanical properties. When the tie rod is pulled, the square structure of the flexible steel square pin is less likely to be squeezed out of the hole in the tie rod. When the tie rod is stopped, a circular pin is inserted into the corresponding position in the circular hole of the tie rod, and the telescopic cylindrical lock is adjusted to a suitable length so that one end abuts against the circular pin and the other end abuts against the support column, ensuring uniform pressure distribution.

[0054] This invention incorporates a force sensor on the pressure base to detect the pressure value applied to the veneer in real time. This pressure is transmitted to the control device in real time. When a preset pressure is reached or a change in pressure is detected, the control device stops the hydraulic cylinder's hydraulic rod from contracting (pulling), further preventing excessive pressure from causing plastic deformation of the veneer. A circular pin is installed on the pull bar, and the length of the retractable cylindrical lock is adjusted to provide suitable and continuous pressure to the veneer. The control device can employ an intelligent hydraulic controller, which automatically controls the contraction (pulling) of the hydraulic cylinder through a control program system, maintaining the pressure on the veneer within a preset pressure range. After installing the circular pin and adjusting the length of the retractable cylindrical lock on the pull bar, the hydraulic cylinder is removed. The retractable cylindrical lock, circular pin, elastic steel square pin, and pressure base work together to provide suitable and continuous pressure to the veneer. At this point, the hydraulic cylinder can be connected to other pressure bars, allowing one hydraulic cylinder to operate multiple pull bars, achieving pressure application to different parts of the veneer and saving on the number of hydraulic cylinders required.

[0055] The stroke of the pressure seat of the present invention can also be controlled by an external time relay. The specific control method adopts the existing technology, and the specific time setting of the time relay can also be obtained through multiple experiments to obtain the optimal value.

[0056] The wall thickness (i.e., height) of the elastic steel square pin of the present invention was determined to be the optimal value through multiple experiments, so that it can provide the best support force for the pressure seat according to the characteristics of the irregular beam. The wall thickness of the elastic steel square pin can be changed according to the veneer of different materials, which solves the problem that the traditional method of gluing and pressing irregular beams is difficult to provide suitable and continuous pressure for veneers of different materials.

[0057] When the continuous bonding and pressure holding mechanism is working, multiple veneers pre-applied with adhesive and ready to be bonded can be transported to a suitable position by a conveyor belt. The pressure seat is moved to the appropriate position, and a flexible steel square pin is inserted. Pulling the pull rod allows the pressure seat and support column to work together, forming a stable clamping system to fix the multiple pre-applied veneers. At this time, the transmission system generates tension, which acts on the pull rod connected to the pressure seat. As the pull rod is pulled, the pressure seat begins to apply pressure to the veneers. Due to the material and hollow structure of the flexible steel square pin, it deforms under pressure. This deformation is converted into a uniform and gradually increasing support force on the pressure seat. The support force is sufficient to support the pressure seat in providing effective bonding pressure to the veneers without being too large and causing plastic deformation. A circular pin is inserted at the corresponding position of the circular opening in the pull rod, and the telescopic cylindrical lock is adjusted to a suitable length so that one end abuts against the circular pin and the other end against the support column, ensuring uniform pressure distribution and providing necessary reaction force support for the subsequent bending process. Afterwards, the bolts connecting the hydraulic rod and the tie rod can be removed. Due to the cooperation between the locking devices, the pressure on the veneer can remain constant, providing suitable and continuous pressure to the veneer. Move the transmission system to the tie rod at another location and reconnect the two with bolts. Repeat the above operation to gradually make each part of the veneer reach the bending degree that the irregular beam should have. After holding the pressure for a period of time, the gluing can be completed.

[0058] In summary, this invention can solve the problem that traditional methods of applying pressure to bond irregular beams are difficult to apply suitable and continuous pressure to veneers of different materials and irregular beams with different degrees of curvature, thereby avoiding plastic deformation of irregular beams and improving their quality. Attached Figure Description

[0059] Figures 1-2 This is a schematic diagram of the overall structure of the present invention.

[0060] Figure 3 This is a diagram showing the working state of the transmission system and the single continuous bonding and pressure holding mechanism applying pressure to the single board in this invention.

[0061] Figure 4 This is a schematic diagram of the pressure holding stage of a single continuous gluing and pressure holding mechanism for multiple single boards after the transmission system of the present invention is removed.

[0062] Figure 5 for Figure 4 A magnified sectional view of point a in the diagram.

[0063] Figure 6 for Figure 4 A magnified view of point b in the image.

[0064] Figure 7 This is a schematic diagram of the pressure holding stage of multiple single boards after the transmission system of the multiple continuous bonding and pressure holding mechanisms of the present invention is removed.

[0065] Figure 8 This is a comparison chart showing the internal stress changes of a single plate before and after using the device of this invention.

[0066] Figure 8 (a) in the figure shows the stress variation inside the single plate without using the device of the present invention.

[0067] Figure 8 (b) in the figure is a diagram showing the stress variation inside a single plate using the device of the present invention. Detailed Implementation

[0068] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings:

[0069] like Figure 1-2 As shown, this embodiment provides a continuous bonding and pressure-holding device to prevent plastic deformation of irregularly shaped beams, including multiple continuous bonding and pressure-holding mechanisms A and a transmission system B. The multiple continuous bonding and pressure-holding mechanisms A are arranged along the curvature of the irregularly shaped beam.

[0070] like Figure 1-2 As shown, each of the continuous bonding and pressure-holding mechanisms A includes a support column 3, a tie rod 4, a pressure seat 5, a slide rail 6, and a locking device; the locking device includes a rear elastic pin 7, a front pin 8, and a retractable lock 9. The slide rail 6 can be fixedly connected to a working platform by bolts, and the position and angle of the slide rail 6 can be changed according to actual needs.

[0071] The telescopic end of the transmission system B is detachably connected to one end of the pull rod 4 in the continuous gluing and pressure holding mechanism A via bolts. The other end of the pull rod 4 passes through the telescopic lock 9, the support column 3, and the pressure seat 5 in sequence. A base 12 is provided at the bottom of the support column 3. The base 12 is slidably connected to the slide rail 6 and can also be fixed to the slide rail 6 by a locking device. Multiple veneers C that have been coated with glue and are to be glued are placed between the pressure seat 5 and the support column 3. The rear elastic pin 7 is inserted into the rear hole 13 on the pull rod 4, and the rear elastic pin 7 abuts against the side of the pressure seat 5 facing away from the multiple veneers C to be glued. The front pin 8 is inserted into the front hole 14 on the pull rod 4. The two ends of the telescopic lock 9 abut against the side of the support column 3 facing away from the multiple veneers C to be glued and the circular pin 8, respectively.

[0072] The support columns 3 in the multiple continuous bonding and pressure holding mechanisms are arranged along the curvature of the irregular beam.

[0073] Multiple continuous gluing and pressure holding mechanisms are used to provide continuous pressure to different parts of multiple veneers C to be glued, thereby forming a glued irregular beam with a certain curvature.

[0074] In this embodiment, as Figure 3As shown, the transmission system includes a hydraulic cylinder 1, and the hydraulic rod of the hydraulic cylinder 1 is connected to one end of the pull bar 4 by bolts.

[0075] In this embodiment, as Figure 3 As shown, a hydraulic sleeve 2 is fixedly connected to the outside of the hydraulic cylinder 1. The inside of the hydraulic sleeve 2 is a cavity. The hydraulic rod of the hydraulic cylinder 1 is located inside the hydraulic sleeve 2. One end of the pull bar 4 extends into the inside of the hydraulic sleeve 2 from the opening at one end and is connected to the hydraulic rod by bolts. One end of the hydraulic sleeve 2 abuts against the side of the support column 3 facing away from the multiple single boards C to be glued.

[0076] In this embodiment, as Figure 4-5 As shown, the retractable lock 9 is a retractable cylindrical lock, including an outer lock sleeve 10 and an inner lock sleeve 11; the outer lock sleeve 10 and the inner lock sleeve 11 are threadedly connected; the inner lock sleeve 11 is located inside the outer lock sleeve 10, and the pull bar 4 passes through the inner lock sleeve 11 in the retractable lock 9.

[0077] In this embodiment, the retractable lock 9 is located inside one end of the hydraulic jacket 2.

[0078] In this embodiment, as Figure 6 As shown, the rear elastic pin 7 is an elastic steel square pin, and a hollow structure penetrating the upper and lower surfaces is provided in the middle of the elastic steel square pin. The multiple rear holes 13 on the pull bar 4 are square holes, and the elastic steel square pin is inserted into the square holes on the pull bar 4.

[0079] In this embodiment, as Figure 5 As shown, the front pin 8 is a circular pin, and the multiple front holes 14 on the pull bar 4 are circular holes, with the circular pin inserted into the circular holes on the pull bar 4.

[0080] In this embodiment, the support column 3, the pressure seat 5, and the inner locking sleeve 11 of the retractable lock 9 are all provided with a through gap 15 for the pull bar 4 to pass through.

[0081] In this embodiment, a force sensor for measuring the pressure value of the single board C is installed on the pressure base 5. The specific location of the force sensor is not limited; it can be placed on the side of the pressure base 5 facing the single board C, or at other locations on the pressure base 5, as long as the pressure received by the single board C can be detected. The output of the force sensor is connected to a control device. The control device controls the hydraulic cylinder 1 to work based on the pressure value of the single board C measured by the force sensor. The force sensor is used to detect the pressure value of the single board C in real time, and the pressure is transmitted to the control device in real time. When the preset pressure is reached or other changes in pressure are detected, the control device controls the hydraulic rod of the hydraulic cylinder 1 to stop pulling (the control method adopts existing technology). This further prevents the single board C from undergoing plastic deformation due to excessive pressure. A circular pin is installed on the pull bar 4, and the length of the retractable cylindrical lock is adjusted to provide suitable and continuous pressure to the single board C. The control device can be an intelligent hydraulic controller, which controls the contraction (pulling) amount of the hydraulic cylinder 1 through an automatic control program system, so that the pressure received by the single board C is maintained within the preset pressure range. Then, install the circular pin on the pull bar 4 and adjust the length of the telescopic cylindrical lock. After that, remove the hydraulic cylinder 1. The telescopic cylindrical lock, circular pin, elastic steel square pin, and pressure seat 5 work together to provide suitable and continuous pressure for the single plate C. At this time, the hydraulic cylinder 1 can be connected to another pressure bar 4. One hydraulic cylinder 1 can operate multiple pull bars 5 separately to apply pressure to different parts of the single plate C, saving the number of hydraulic cylinders 1 used.

[0082] In this embodiment, a locking mechanism is provided between the base 12 at the bottom of the support column 3 and the slide rail 6. The locking mechanism adopts existing technology and can be a bolt locking, screw and nut locking, or other methods.

[0083] In this embodiment, the stroke of the pressure seat 5 can also be controlled by an external time relay, and the specific control method adopts existing technology.

[0084] In this embodiment, the length of the telescopic cylindrical lock can be adjusted manually or by an external electrical automatic control device.

[0085] In this embodiment, the wall thickness (i.e., height) of the elastic steel square pin is determined to be the optimal value through multiple experiments, so that it can provide the best support force for the pressure seat 5 according to the characteristics of the irregular beam. The wall thickness of the elastic steel square pin can be changed according to the single plate of different materials.

[0086] In this embodiment, during operation, veneer C is transported to a suitable position by a conveyor belt. The pressure seat 5 is moved, and a flexible steel square pin is inserted, allowing the pressure seat 5 and support column 3 to work together to form a stable clamping system, fixing veneer C in place. At this time, the transmission system activates, generating tension that acts on the pull rod 4 connecting to the pressure seat 5. As the pull rod 4 is pulled, the pressure seat 5 begins to apply pressure to the veneer. Due to the material and hollow structure of the flexible steel square pin, it deforms under pressure. This deformation translates into a uniform and gradually increasing supporting force on the pressure seat 5, allowing the pressure seat 5 to slowly apply pressure to the veneer C, further preventing excessive pressure from being applied too quickly and causing plastic deformation of the veneer C. Once a certain pressure value is reached, the positions of the flexible steel square pin and the pressure seat are locked by a retractable cylindrical lock and a circular pin. At this point, the supporting force provided by the flexible steel square pin tends to stabilize, its magnitude being sufficient to support the pressure seat 5 in providing effective bonding pressure to the veneer C without being too large and causing plastic deformation of the veneer C. Figure 8 Figure (a) shows the internal stress variation of the veneer without the pressure-holding device of this invention. In actual plywood production, improper use of the pressure required for gluing with a traditional plywood press causes plastic deformation of the wood, damaging its internal structure and resulting in a decrease in the required gluing pressure. However, the pressure-holding device of this embodiment prevents veneer C from undergoing plastic deformation and maintains a constant stress during the gluing time. Its stress variation curve is shown in [reference needed]. Figure 8 (b) in the middle. Figure 8 In (a) and (b), the horizontal axis represents time (in seconds), and the vertical axis represents stress (in Pa). Insert the circular pin 8 into the corresponding position of the circular opening in the pull rod 4, and adjust the retractable cylindrical lock 9 to a suitable length. That is, rotate the outer lock sleeve 10 relative to the inner lock sleeve 11, changing the axial length of the inner lock sleeve 11 and the outer lock sleeve 10 (i.e., the length of the retractable cylindrical lock 9). This ensures that the two ends of the retractable cylindrical lock 9, which are far apart, abut against the circular pin 8 and the outer lock sleeve 10 respectively (e.g., one end of the inner lock sleeve 11 abuts against the circular pin 8, and one end of the outer lock sleeve 10 abuts against the support column 3, or one end of the inner lock sleeve 11 abuts against the support column 3, and one end of the outer lock sleeve 10 abuts against the circular pin 8). This ensures uniform pressure distribution and provides necessary reaction force support for the subsequent bending process. Figure 3 As shown.

[0087] After that, as Figure 4 As shown, the bolts connecting the hydraulic rod and the tie rod 4 can be removed. Due to the cooperation between the locking devices, the pressure on the single panel C remains constant, providing suitable and continuous pressure to the single panel. Move the transmission system to another tie rod location and reconnect the two with bolts. Repeat the above operation, as shown. Figure 7 As shown, gradually bring each part of the single board C to the bending degree that the irregular beam should have, and after holding the pressure for a period of time, the gluing can be completed.

[0088] This embodiment also provides a continuous bonding and pressure holding device to prevent plastic deformation of irregular beams, and a continuous bonding and pressure holding method. This method involves multiple continuous bonding and pressure holding mechanisms A applying continuous pressure to different parts of multiple veneers C that have been coated with glue and are to be bonded; gradually making each part of the multiple veneers C reach the bending curvature that the irregular beam should have; after the multiple veneers C are continuously pressed for a period of time, the bonding of the multiple veneers C is completed, and an irregular beam plywood with a certain bending curvature is formed;

[0089] Specifically, it includes:

[0090] Step 1: Perform the following operations on multiple continuous bonding and pressure holding mechanisms A:

[0091] Step 1.1: Adjust the position of the base 12 on the support column 3 on the slide rail 6 so that the support columns 3 in the multiple continuous bonding and pressure holding mechanisms A are arranged along the required curvature of the irregular beam; after the position of the support column 3 is adjusted, the position of the support column 3 is kept fixed by the locking mechanism.

[0092] Step 1.2: Transport multiple veneers C that have been coated with glue and are ready to be glued to a suitable position, so that the middle part of veneer C is placed on the upper surface of the base 12 of the support column 3 in the continuous gluing and pressure holding mechanism A arranged in the middle position; and veneer C is located between the pressure seat 5 and the support column 3.

[0093] Step 1.3: Pass the pull bar 4 through the through gap 15 in the middle of the pressure base 5, support column 3 and retractable lock 9 in sequence. Select a suitable rear side hole 13 from the multiple rear side holes 13 in the pull bar 4, and insert the rear elastic pin 7 into the rear side hole 13, with the rear elastic pin 7 abutting against one side of the pressure base 5; the pull bar 4 in step 1.3 is located above the single board C in step 1.2;

[0094] Step 1.4: Place several more veneers C that have been coated with glue and are ready to be glued on the upper surface of the pull strip 4 in the multiple continuous gluing and pressure holding mechanisms A, with the veneer C located between the pressure base 5 and the support column 3; the veneer C in step 1.4 is located directly above the veneer C in step 1.2.

[0095] Step 2: A suspension rope rail is installed above the multiple continuous bonding and pressure holding mechanisms A. The hydraulic cylinder 1 is slidably connected to the suspension rope rail via a suspension rope, and the hydraulic cylinder 1 is suspended in the air by the suspension rope. Move the hydraulic cylinder 1 and manually connect the hydraulic rod of the hydraulic cylinder 1 to the pull bar 4 of the continuous bonding and pressure holding mechanism A arranged in the middle position via bolts. Also, manually press one end of the hydraulic sleeve 2 of the hydraulic cylinder 1 against the side of the support column 3. Figure 3 As shown;

[0096] Start hydraulic cylinder 1. The hydraulic rod of hydraulic cylinder 1 pulls the pull bar 4. The pull bar 4 drives the rear elastic pin 7 to move. The rear elastic pin 7 pushes the pressure seat 5 to move in the direction of the multiple veneers C to be glued. Finally, the pressure seat 5 abuts against the multiple veneers C to be glued and applies pressure to the veneers C. This makes the pressure seat 5 and the support column 3 work together to clamp and apply pressure to the multiple veneers C to be glued.

[0097] Step 3: The force sensor detects the pressure on the single board in real time and sends a signal to the control device. The control device determines whether to control the hydraulic cylinder 1 to stop pulling based on the pressure value. When it is necessary to stop pulling, the control device controls the hydraulic cylinder 1 to stop pulling and manually inserts the front pin 8 into the front hole 14 of the pull bar 4 mentioned in step 2, and adjusts the telescopic lock 9 to a suitable length so that one end abuts against the round pin 8 and the other end abuts against the support column 3, ensuring that the pressure is evenly distributed and providing uniform and continuous stable pressure for multiple single boards C to be glued.

[0098] Step 4: Disconnect the hydraulic rod of hydraulic cylinder 1 from the pull bar 4 of the continuous bonding and pressure holding mechanism A in the middle position.

[0099] Then, by moving the hydraulic cylinder 1 with a hoisting rope, the hydraulic rods of the hydraulic cylinder 1 are sequentially connected to the pull rods 4 in different continuous bonding and pressure-holding mechanisms A through bolts, starting from the middle position and moving outwards to the sides. This allows for the pulling operation of different pull rods 4. That is, following steps 2 and 3, the remaining continuous bonding and pressure-holding mechanisms A are operated sequentially from the middle position outwards to the sides, so that multiple continuous bonding and pressure-holding mechanisms A provide uniform and continuous pressure to different parts of multiple veneers C to be bonded. Due to the different positions of the support columns 3, the various parts of the multiple veneers C achieve the required bending curvature of an irregularly shaped beam, such as... Figure 7 As shown ( Figure 7 The continuous bonding and pressure-holding mechanism A at the edge, as shown in the diagram, has not yet removed its transmission system B; the other continuous bonding and pressure-holding mechanisms A have removed their transmission systems B. When all continuous bonding and pressure-holding mechanisms A have removed their transmission systems B, and one end of the retractable lock 9 is pressed against the circular pin 8, and the other end against the support column 3, ensuring even pressure distribution, uniform and continuous pressure is provided to the multiple veneers C that have been coated with adhesive and are ready to be bonded. After a period of pressure holding, a bonded irregular beam plywood with a certain curvature is formed. The locking device can then be released, and the bonded irregular beam plywood with a certain curvature can be removed. Further hot pressing or other operations can be performed on the irregular beam plywood depending on the actual situation.

[0100] Of course, in this embodiment, multiple transmission systems B can also be set to pull the pull bar 4 in multiple continuous bonding and pressure holding mechanisms A, thereby achieving rapid operation. The transmission system B can slide on the suspension rope rail via a suspension rope, or it can be fixed by other existing fixing methods.

[0101] The scope of protection of this invention includes, but is not limited to, the above embodiments. The scope of protection of this invention is defined by the claims. Any substitutions, modifications, or improvements to this technology that are easily conceived by those skilled in the art fall within the scope of protection of this invention.

Claims

1. A continuous bonding and pressure-holding method for preventing plastic deformation of irregularly shaped beams, characterized in that, Multiple continuous gluing and pressure-holding mechanisms apply continuous pressure to different parts of multiple veneers that have been coated with glue and are ready to be glued; gradually, each part of the multiple veneers achieves the required curvature of the irregular beam. After the multiple veneers are continuously pressed for a period of time, the gluing of the multiple veneers is completed, forming an irregular beam plywood with a certain curvature. The single continuous bonding and pressure holding mechanism includes a support column, a tie rod, a pressure seat, a rear elastic pin, a front pin, and a retractable lock. The continuous bonding and pressure holding method specifically includes the following steps: Step 1: Perform the following operations on multiple continuous bonding and pressure holding mechanisms: Step 1.1: Adjust the position of the support columns so that the support columns in the multiple continuous bonding and pressure holding mechanisms are arranged along the curvature of the irregular beam; after the position of the support columns is adjusted, keep the position of the support columns fixed. Step 1.2: Pass the pull bar through the through gaps in the pressure seat, support column and retractable lock in sequence, insert the rear elastic pin into the rear hole of the pull bar, and make the rear elastic pin abut against one side of the pressure seat. Step 1.3: Place multiple veneers that have been coated with glue and are ready to be glued between the pressure base and the support column in the continuous gluing and pressure holding mechanism; Step 2: First, pull the pull bar in the continuous gluing and pressure holding mechanism arranged in the middle position. The pull bar drives the rear elastic pin to move. The rear elastic pin pushes the pressure seat to move in the direction of the multiple veneers to be glued. Finally, the pressure seat abuts against the multiple veneers to be glued, and applies pressure to the veneers. This causes the pressure seat and the support column to work together to clamp the multiple veneers to be glued. Step 3: Insert the front pin into the front hole of the pull bar described in Step 2, and adjust the telescopic lock to a suitable length so that one end of it abuts against the front pin and the other end abuts against the support column, ensuring that the pressure is evenly distributed and providing uniform and continuous pressure to multiple veneers to be glued. Step 4: Operate the remaining continuous gluing and pressure holding mechanisms in sequence according to the methods in Step 2 and Step 3, so that the multiple continuous gluing and pressure holding mechanisms provide uniform and continuous pressure to different parts of the multiple veneers to be glued, and make each part of the multiple veneers achieve the bending curvature that the irregular beam should have. After holding the pressure for a period of time, an irregular beam plywood with a certain bending curvature is formed after gluing. The rear elastic pin is a square elastic steel pin with a hollow structure in the middle. The multiple rear holes on the pull bar are square holes, and the square elastic steel pin is used to insert into the square holes on the pull bar. The front pin is a round pin, and the multiple front holes on the pull bar are round holes. The round pin is used to insert into the round holes on the pull bar. The pull bar is pulled by a transmission system, which includes a hydraulic cylinder and a hydraulic sleeve is fixedly connected to the outside of the hydraulic cylinder. The retractable lock includes an outer lock sleeve and an inner lock sleeve; the outer lock sleeve and the inner lock sleeve are threaded together; the inner lock sleeve is located inside the outer lock sleeve, and the pull bar passes through the inner lock sleeve in the retractable lock. The retractable lock can extend into the inner side of one end of the hydraulic sleeve on the hydraulic cylinder.

2. The continuous bonding and pressure holding method for avoiding plastic deformation of irregularly shaped beams according to claim 1, characterized in that, The single continuous bonding and pressure holding mechanism also includes a slide rail, and a base is provided at the bottom of the support column. The base is slidably connected to the slide rail, and a locking mechanism is provided between the base and the slide rail.

3. The continuous bonding and pressure holding method for avoiding plastic deformation of irregularly shaped beams according to claim 2, characterized in that, Between steps 1.1 and 1.2, the following steps are also included: Step 1.1a: Place the middle part of multiple veneers that have been coated with glue and are to be glued on the upper surface of the base of the support column in the continuous gluing and pressure holding mechanism arranged in the middle position; and the veneer is located between the pressure base and the support column; The pull strip in step 1.2 is located above the single panel in step 1.1a; Step 1.3 specifically includes: Several other veneers that have been coated with glue and are ready to be glued are placed on the upper surface of the tie rods in several continuous gluing and pressure holding mechanisms, with the veneers located between the pressure base and the support column; The single board in step 1.3 is located directly above the single board in step 1.1a.

4. The continuous bonding and pressure-holding method for avoiding plastic deformation of irregularly shaped beams according to claim 1, characterized in that, The hydraulic rod of the hydraulic cylinder is connected to one end of the pull bar by bolts.

5. The continuous bonding and pressure-holding method for avoiding plastic deformation of irregularly shaped beams according to claim 4, characterized in that, In the transmission system, the interior of the hydraulic sleeve is a cavity, the hydraulic rod of the hydraulic cylinder is located inside the hydraulic sleeve, one end of the pull bar extends into the interior of the hydraulic sleeve from the opening at one end of the hydraulic sleeve and is connected to the hydraulic rod by bolts, and one end of the hydraulic sleeve abuts against the side of the support column facing away from the multiple veneers to be glued.

6. The continuous bonding and pressure holding method for avoiding plastic deformation of irregularly shaped beams according to claim 5, characterized in that, A suspension rope slide rail is provided above multiple continuous bonding and pressure holding mechanisms. The hydraulic cylinder is slidably connected to the suspension rope slide rail via a suspension rope, and the hydraulic cylinder is suspended in the air via the suspension rope. Step 2 specifically includes: Move the hydraulic cylinder, manually connect the hydraulic rod of the hydraulic cylinder to the pull bar of the continuous adhesive pressure holding mechanism arranged in the middle position by bolts, and manually press one end of the hydraulic sleeve of the hydraulic cylinder against the side of the support column. When the hydraulic cylinder is activated, the hydraulic rod pulls the pull bar, which in turn moves the rear elastic pin. The rear elastic pin then pushes the pressure seat toward the direction where the multiple veneers to be glued are located. Finally, the pressure seat abuts against the multiple veneers to be glued, exerting pressure on the veneers. This causes the pressure seat and the support column to work together to clamp the multiple veneers to be glued. Step 4 further includes: Disconnect the hydraulic rod of the hydraulic cylinder from the pull bar of the continuous bonding and pressure holding mechanism arranged in the middle position. Then move the hydraulic cylinder and connect the hydraulic rod of the hydraulic cylinder to the pull bar of the different continuous bonding and pressure holding mechanisms in sequence from the middle position to the two sides, so as to pull the different pull bars.

7. The continuous bonding and pressure holding method for avoiding plastic deformation of irregularly shaped beams according to claim 1, characterized in that, A force sensor for measuring the pressure value of a single board is installed on the pressure base. The output end of the force sensor is connected to a control device. The control device controls the hydraulic cylinder to operate based on the pressure value of the single board measured by the force sensor.

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