Continuous gluing and pressure maintaining method for avoiding plastic deformation of special-shaped beam

Abstract

The invention discloses a continuous gluing and pressure maintaining method for avoiding plastic deformation of a special-shaped beam. The continuous gluing and pressure maintaining method comprises the following steps: a plurality of continuous gluing and pressure maintaining mechanisms respectively provide continuous pressure for different parts of a plurality of glued veneers to be glued; and gradually enabling each part of the plurality of veneers to reach the required bending radian of the special-shaped beam, and after the plurality of veneers are subjected to continuous pressure maintaining for a period of time, completing the gluing of the plurality of veneers and forming the special-shaped beam with a certain bending radian. On the basis of elastic deformation of wood, the locking and pressing device is adjusted, so that the pressing seat can provide appropriate and stable pressure for special-shaped beam plywood forming, the defective rate of finished products is reduced, and the quality of special-shaped beams is improved.

Description

Technical Field

[0001] The invention relates to the technical field of plywood presses, in particular to a continuous gluing and pressure-maintaining method for preventing special-shaped beams from undergoing plastic deformation. Background Art

[0002] The multi-layer glued bending process uses multiple layers of thin rotary slices to assemble, mold and heat. This process is simple to operate, efficient, high technical content, high mechanical strength, smooth curved surface, and is suitable for small batch and multi-variety bent wood production. Multi-layer glued bent wood is made of multiple layers of veneer laminated and glued together. It can solve the problem of poor bending performance of wood and greatly improve its curvature. It is a process commonly used by furniture factories to make bent wood.

[0003] The current traditional plywood press includes a tie bar, a wedge pin, a press seat and a support column. The tie bar passes through the front-to-back gaps on the press seat and the support column, the wedge pin is inserted into the hole of the tie bar, and the wedge pin abuts against the side of the press seat. The gluing pressure method based on the above-mentioned traditional plywood press is: pull the tie bar, the tie bar drives the wedge pin to move, the wedge pin pushes the press seat, and the press seat then presses multiple veneers to be glued, and the multiple veneers to be glued are clamped between the press seat and the support column. During use, it was found that due to the influence of multiple factors such as veneer thickness, veneer moisture content, veneer surface roughness, unit pressure, etc., the traditional gluing and pressurizing method is difficult to provide suitable and continuous pressure for veneers of different materials and special-shaped beams with different degrees of curvature: that is, when the wedge pin is inserted into the hole of the pressure strip, the wedge pin is inserted too tightly, which will cause excessive pressure and plastic deformation of the veneer; when the wedge pin is inserted too loosely, the pressure is too small and the veneer is poorly formed. The wedge pin is also easily squeezed out of the hole of the pull strip during the gluing and forming process of the veneer (that is, when the pull strip is pulled); resulting in a high defective rate and low quality of the finished plywood with special-shaped beams; in response to the above problems, a new continuous gluing and pressure-maintaining method is proposed to avoid plastic deformation of special-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-maintaining method and device for avoiding plastic deformation of special-shaped beams in view of the deficiencies of the above-mentioned prior art. The method can provide suitable and continuous pressure to multiple veneers to be glued, and gradually make various parts of the multiple veneers reach the required bending curvature of the special-shaped beam. After the multiple veneers are continuously pressure-maintained for a period of time, the gluing of the multiple veneers is completed, and a special-shaped beam with a certain bending curvature is formed; at the same time, the purpose of avoiding plastic deformation of the special-shaped beam and improving the quality of the special-shaped beam is achieved.

[0005] In order to achieve the above technical objectives, the technical solution adopted by the present invention is:

[0006] A continuous gluing and pressure-maintaining method for preventing plastic deformation of a special-shaped beam, wherein a plurality of continuous gluing and pressure-maintaining mechanisms respectively provide continuous pressure to different parts of a plurality of veneers that have been glued and are to be glued; each part of the plurality of veneers is gradually made to reach the curvature that the special-shaped beam should have; after the plurality of veneers are continuously pressure-maintained for a period of time, the plurality of veneers are glued together, and a special-shaped beam plywood with a certain curvature is formed;

[0007] The single continuous gluing and pressure-maintaining mechanism includes a support column, a pull bar, a pressure seat, a rear elastic pin, a front pin and a retractable lock;

[0008] The specific steps include:

[0009] Step 1: Perform the following operations on multiple continuous gluing and pressure-maintaining mechanisms:

[0010] Step 1.1: Adjust the positions of the support columns so that the support columns in the multiple continuous gluing and pressure-maintaining mechanisms are arranged along the curvature of the special-shaped beam; after the positions of the support columns are adjusted, keep the positions of the support columns fixed;

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

[0012] Step 1.3: placing a plurality of veneers to be glued and coated with glue between the pressure seat and the support column in the continuous gluing and pressure-maintaining mechanism;

[0013] Step 2: First, pull the pull rod in the continuous gluing and pressure-maintaining mechanism arranged in the middle position, the pull rod drives the rear elastic pin to move, and the rear elastic pin pushes the pressure seat to move in the direction where the multiple veneers to be glued are located, and finally the pressure seat contacts the multiple veneers to be glued, generating pressure on the veneers, so that the pressure seat and the support column work together to clamp the multiple veneers to be glued;

[0014] Step 3: Insert the front pin into the front hole of the tie bar mentioned in step 2, and adjust the retractable lock to a suitable length so that one end of it rests against the round pin and the other end rests against the support column to ensure that the pressure is evenly distributed and provide uniform and continuous pressure for multiple veneers to be glued;

[0015] Step 4: Operate the remaining continuous gluing and pressure-maintaining mechanisms in sequence according to the methods of step 2 and step 3, so that the multiple continuous gluing and pressure-maintaining mechanisms respectively provide uniform and continuous pressure to different parts of the multiple veneers to be glued, and make the various parts of the multiple veneers reach the required bending curvature of the special-shaped beam. After a period of pressure maintenance, a special-shaped beam plywood with a certain curvature and completed gluing is formed.

[0016] As a further improved technical solution of the present invention, the single continuous gluing and pressure maintaining mechanism also includes a slide rail, 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.

[0017] As a further improved technical solution of the present invention, the following steps are also included between step 1.1 and step 1.2:

[0018] Step 1.1a: placing the middle parts of a plurality of veneers to be glued and coated with glue on the upper surface of the base at the bottom of the support column in the continuous gluing and pressure-maintaining mechanism arranged in the middle position; and the veneer is located between the pressure seat and the support column;

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

[0020] The step 1.3 is specifically as follows:

[0021] Placing a plurality of other veneers that have been coated with glue and are to be glued on the upper surface of the tie bars in the plurality of continuous gluing and pressure-maintaining mechanisms, with the veneers being located between the pressure seat 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 improved technical solution of the present invention, the pull rod is pulled by a transmission system, and the transmission system includes a hydraulic cylinder, and a hydraulic rod of the hydraulic cylinder is connected to one end of the pull rod by bolts.

[0024] As a further improved technical solution of the present invention, in the transmission system, the outside of the hydraulic cylinder is fixedly connected to a hydraulic jacket, the interior of the hydraulic jacket is a cavity, the hydraulic rod of the hydraulic cylinder is located inside the hydraulic jacket, one end of the pull rod extends from an opening at one end of the hydraulic jacket into the interior of the hydraulic jacket and is connected to the hydraulic rod by bolts, and one end of the hydraulic jacket 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 rope slide rail is arranged above the multiple continuous gluing and pressure-maintaining mechanisms, the hydraulic cylinder is slidably connected to the rope slide rail through the rope, and the hydraulic cylinder is rotated in the air through the rope;

[0026] The step 2 is specifically as follows:

[0027] Move the hydraulic cylinder, manually connect the hydraulic rod of the hydraulic cylinder to the tie rod of the continuous gluing and pressure-maintaining mechanism arranged in the middle position through bolts, and manually make one end of the hydraulic jacket of the hydraulic cylinder contact the side of the support column;

[0028] The hydraulic cylinder is started, and the hydraulic rod of the hydraulic cylinder pulls the pull rod, and the pull rod drives the rear elastic pin to move, and the rear elastic pin pushes the pressing seat to move in the direction where the multiple veneers to be glued are located, and finally the pressing seat contacts the multiple veneers to be glued, and generates pressure on the veneers, so that the pressing seat and the support column work together to clamp the multiple veneers to be glued;

[0029] The step 4 further comprises:

[0030] The hydraulic rod of the hydraulic cylinder and the pull rod of the continuous gluing and pressure maintaining mechanism arranged in the middle position are disassembled, and then the hydraulic cylinder is moved, and the hydraulic rod of the hydraulic cylinder is respectively connected with the pull rods in different continuous gluing and pressure maintaining mechanisms by bolts in the order from the middle position to the positions on both sides, so as to realize the pulling of different pull rods.

[0031] As a further improved technical solution of the present invention, in the continuous gluing and pressure maintaining mechanism, the retractable lock includes an outer locking sleeve and an inner locking sleeve; the outer locking sleeve is threadedly connected to the inner locking sleeve; the inner locking sleeve is located on the inner side of the outer locking sleeve, and the pull rod 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 jacket on the hydraulic cylinder.

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

[0033] As a further improved technical solution of the present invention, in the continuous gluing and pressure maintaining mechanism, the front side pin is a circular pin, the multiple front side holes opened on the pull rod are circular holes, and the circular pin is inserted into the circular holes opened on the pull rod.

[0034] As a further improved technical solution of the present invention, in the continuous gluing and pressure-maintaining mechanism, the support column, the pressure seat and the inner locking sleeve in the retractable lock are all provided with a front-to-back through-gap for the pull rod to pass through.

[0035] As a further improved technical solution of the present invention, a force sensor for measuring the pressure value of the single plate is arranged on the pressure seat, and the output of the force sensor is connected to the control device. The control device controls the action of the hydraulic cylinder according to the pressure value of the single plate measured by the force sensor.

[0036] The present invention also provides a continuous gluing and pressure-maintaining device for preventing plastic deformation of special-shaped beams. The device can provide suitable and continuous pressure to multiple single plates to be glued, gradually making various parts of the multiple single plates reach the required bending curvature of the special-shaped beam, and finally completing the gluing to form a special-shaped beam with a certain bending curvature; at the same time, it can achieve the purpose of preventing plastic deformation of the special-shaped beam and improving the quality of the finished special-shaped beam.

[0037] In order to achieve the above-mentioned object, a continuous gluing and pressure-maintaining device for preventing a special-shaped beam from undergoing plastic deformation according to the present invention comprises a plurality of continuous gluing and pressure-maintaining mechanisms and a transmission system;

[0038] The continuous gluing and pressure-maintaining mechanism comprises a support column, a pull bar, a pressure seat, a slide rail and a locking device; the locking device comprises 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-maintaining mechanism, and 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; a plurality of 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 plurality of veneers to be glued; the front pin is inserted into the front hole opened on the pull rod, and the two end surfaces of the telescopic lock respectively abut between the side of the support column facing away from the plurality of veneers to be glued and the circular pin;

[0040] The supporting columns in the multiple continuous gluing and pressure-maintaining mechanisms are arranged along the curvature of the special-shaped beam;

[0041] The plurality of continuous gluing and pressure-maintaining mechanisms are used to respectively provide continuous pressure to different parts of the plurality of veneers to be glued, thereby forming a glued special-shaped beam plywood with a certain curvature.

[0042] As a further improvement to the above-mentioned continuous gluing and pressure-maintaining device, the transmission system includes a hydraulic cylinder, and a hydraulic rod of the hydraulic cylinder is connected to one end of the pull rod by bolts.

[0043] As a further improvement to the above-mentioned continuous gluing and pressure-maintaining device, a hydraulic jacket is fixedly connected to the outside of the hydraulic cylinder, the interior of the hydraulic jacket is a cavity, the hydraulic rod of the hydraulic cylinder is located inside the hydraulic jacket, one end of the pull rod extends from an opening at one end of the hydraulic jacket into the interior of the hydraulic jacket and is connected to the hydraulic rod by bolts, and one end of the hydraulic jacket is in contact with the side of the support column facing away from the multiple veneers to be glued.

[0044] As a further improvement to the above-mentioned continuous gluing and pressure maintaining device, the retractable lock is a retractable cylindrical lock, comprising an outer locking sleeve and an inner locking sleeve; the outer locking sleeve is threadedly connected to the inner locking sleeve; the inner locking sleeve is located on the inner side of the outer locking sleeve, and the pull rod passes through the inner locking sleeve in the retractable lock.

[0045] As a further improvement to the above-mentioned continuous gluing and pressure-maintaining device, the retractable lock is located on the inner side of one end of the hydraulic jacket.

[0046] As a further improvement of the above-mentioned continuous gluing and pressure maintaining device, the rear elastic pin is an elastic steel square pin, and a hollow structure penetrating the upper and lower surfaces is opened in the middle of the elastic steel square pin. The multiple rear holes opened on the pull rod are square holes, and the elastic steel square pin is inserted into the square holes opened on the pull rod.

[0047] As a further improvement to the above-mentioned continuous gluing and pressure-maintaining device, the front side pin is a circular pin, the multiple front side holes opened on the pull rod are circular holes, and the circular pin is inserted into the circular holes opened on the pull rod.

[0048] As a further improvement to the above-mentioned continuous gluing and pressure-maintaining device, the support column, the pressure seat and the inner locking sleeve in the retractable lock are all provided with a front-to-back through-gap for the pull rod to pass through.

[0049] As a further improvement to the above-mentioned continuous gluing and pressure-maintaining 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 gluing and pressure-maintaining device, a force sensor for measuring the pressure value of the single board is arranged on the pressure seat, and the force sensor is connected to the control device, and the control device is used to control the operation of the hydraulic cylinder according to the pressure value of the single board detected by the force sensor.

[0051] Compared with the prior art, the present invention has the following beneficial effects:

[0052] The continuous gluing and pressure-maintaining method for avoiding plastic deformation of the special-shaped beam can adjust the retractable lock according to the elastic deformation of the corresponding wood, so that the pressure seat provides appropriate pressure for the special-shaped beam plywood molding, reduces the defective rate of the finished product, and improves the quality of the special-shaped beam. The position between the base at the bottom of the support column and the slide rail can be changed according to the different bending degrees of the special-shaped beam. The position of the support column on the slide rail is different, and the special-shaped beam plywood with different bending degrees can be produced.

[0053] On the basis of the prior art, the present invention changes the wedge pin into an elastic steel square pin. Due to the material and hollow structure of the elastic steel square pin, it will deform when subjected to pressure. This deformation is converted into a uniform and gradually increasing supporting force on the pressure seat, slowly pressurizing the veneer, further preventing plastic deformation caused by rapid application of excessive pressure. Finally, the positions of the elastic steel square pin and the pressure seat are locked by a retractable cylindrical lock and a circular pin, and the pressure tends to be stable. At this moment, the supporting force of the elastic steel square pin is sufficient to support the pressure seat to provide effective gluing pressure for the veneer, but not too large to cause plastic deformation of the veneer, ensuring the gluing quality and uniformity of the special-shaped beam, making the internal stress of the structural wood product uniform as a whole, and further improving its mechanical properties; when the pull rod is pulled, the square structure of the elastic steel square pin is not easy to be squeezed out of the hole of the pull rod. When the pull rod is stopped, the present invention inserts a circular pin at the corresponding position of the circular hole of the pull rod, adjusts the retractable cylindrical lock to a suitable length, so that one end of it abuts against the circular pin and the other end abuts against the support column, ensuring uniform pressure distribution.

[0054] The present invention adds a force sensor on the pressure seat to detect the pressure value of the single board 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 the pressure are found, the control device controls the hydraulic rod of the hydraulic cylinder to stop contracting (pulling), and further prevents the single board from being plastically deformed due to excessive pressure, and installs a round pin on the pull bar and adjusts the length of the retractable cylindrical lock, so as to provide suitable and continuous pressure for the single board. The control device can adopt an intelligent hydraulic controller to control the contraction (pulling) amount of the hydraulic cylinder through an automatic control program system, so that the pressure on the single board is maintained within the preset pressure range. Then, a round pin is installed on the pull bar and the length of the retractable cylindrical lock is adjusted, and then the hydraulic cylinder is removed. The retractable cylindrical lock, the round pin, the elastic steel square pin, and the pressure seat work together to provide suitable and continuous pressure for the single board. At this time, the hydraulic cylinder can be connected with another pressure bar for operation, and one hydraulic cylinder can operate multiple pull bars to achieve pressure on different parts of the single board, saving the number of hydraulic cylinders.

[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 obtain the optimal value through multiple experiments.

[0056] The wall thickness (i.e., height) of the elastic steel square pin of the present invention is determined to be the optimal value through multiple experiments, so that it can provide the best supporting force for the pressure seat according to the characteristics of the special-shaped beam. The wall thickness of the elastic steel square pin can be replaced according to single plates of different materials, solving the problem that the traditional special-shaped beam gluing and pressing method is difficult to provide suitable and continuous pressure for single plates of different materials.

[0057] When the continuous gluing and pressure-maintaining mechanism is working, multiple veneers that have been coated with glue and are to be glued can be transported to a suitable position by the conveyor belt, the press seat is moved to a suitable position, and the elastic steel square pin is inserted. If the pull bar is pulled, the press seat and the support column can work together to form a stable clamping system to fix multiple veneers that have been coated with glue and are to be glued; at this time, when the transmission system is started, a pulling force is generated, which acts on the pull bar connected to the press seat. As the pull bar is pulled, the press seat begins to apply pressure to the veneer. Due to the material and hollow structure of the elastic steel square pin, it will deform when subjected to pressure. This deformation is converted into a uniform and gradually increasing support force on the press seat. The size of the support force is sufficient to support the press seat to provide effective gluing pressure for the veneer, but not too large to cause plastic deformation of the veneer; insert a circular pin at the corresponding position of the circular empty space of the pull bar, adjust the retractable cylindrical lock to a suitable length, so that one end of it is against the circular pin and the other end is against the support column, to ensure that the pressure is evenly distributed, and also provide the necessary reaction force support for the subsequent bending process. After that, the bolts at the connection between the hydraulic rod and the tie rod can be removed. Due to the cooperation between the locking and pressing devices, the pressure on the single board can remain unchanged at this time, providing suitable and continuous pressure for the single board; move the transmission system to the tie rod at another point, and reconnect the two with bolts; repeat the above operations, gradually making each part of the single board reach the desired bending degree of the special-shaped beam, and the gluing can be completed after maintaining the pressure for a period of time.

[0058] In summary, the present invention can solve the problem that the traditional method of gluing and applying pressure to special-shaped beams is difficult to provide suitable and continuous pressure for single plates of different materials and special-shaped beams with different bending degrees, thereby achieving the purpose of avoiding plastic deformation of special-shaped beams and improving the quality of special-shaped beams. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0060] Figure 3 This is a working state diagram of the transmission system and a single continuous gluing and pressure-maintaining mechanism in the present invention applying pressure to a single board.

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

[0062] Figure 5 for Figure 4 A partial enlarged cross-sectional view at point a in FIG.

[0063] Figure 6 for Figure 4 A local enlarged view of point b in FIG.

[0064] Figure 7 It is a schematic diagram of the pressure-maintaining stage of multiple single boards after the transmission systems of multiple continuous gluing and pressure-maintaining mechanisms of the present invention are removed.

[0065] Figure 8 It is a comparison diagram of the internal stress change of a single plate before and after using the device of the present invention.

[0066] Figure 8 (a) is a diagram showing the change in internal stress of a single plate without using the device of the present invention.

[0067] Figure 8 (b) is a diagram showing the change in internal stress of a single plate using the device of the present invention. DETAILED DESCRIPTION

[0068] The specific embodiments of the present invention are further described below according to the accompanying drawings:

[0069] like Figure 1-2 As shown, this embodiment provides a continuous gluing and pressure-maintaining device for preventing plastic deformation of a special-shaped beam, comprising a plurality of continuous gluing and pressure-maintaining mechanisms A and a transmission system B. The plurality of continuous gluing and pressure-maintaining mechanisms A are arranged along the curvature of the special-shaped beam.

[0070] like Figure 1-2 As shown, each of the continuous gluing and pressure-maintaining mechanisms A comprises a support column 3, a pull bar 4, a pressure seat 5, a slide rail 6 and a locking device; the locking device comprises a rear elastic pin 7, a front pin 8 and a retractable lock 9. The slide rail 6 can be fixedly connected to a certain working platform by bolts, and the position and angle of the slide rail 6 can also 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 maintaining mechanism A by bolts, and 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, and the base 12 is slidably connected to the slide rail 6, and the base 12 can also be fixed to the slide rail 6 by a locking device; a plurality of 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 opened on the pull rod 4, and the rear elastic pin 7 abuts against the side of the pressure seat 5 facing away from the plurality of veneers C to be glued; the front pin 8 is inserted into the front hole 14 opened on the pull rod 4, and the two end faces of the telescopic lock 9 respectively abut between the side of the support column 3 facing away from the plurality of veneers C to be glued and the circular pin 8.

[0072] The supporting columns 3 in the multiple continuous gluing and pressure-maintaining mechanisms are arranged along the curvature of the special-shaped beam.

[0073] The plurality of continuous gluing and pressure-maintaining mechanisms are used to respectively provide continuous pressure to different parts of the plurality of veneers C to be glued, thereby forming a glued special-shaped beam having a certain curvature.

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

[0075] In this embodiment, Figure 3 As shown, the outside of the hydraulic cylinder 1 is fixedly connected to a hydraulic jacket 2, the interior of the hydraulic jacket 2 is a cavity, the hydraulic rod of the hydraulic cylinder 1 is located inside the hydraulic jacket 2, one end of the pull rod 4 extends from an opening at one end of the hydraulic jacket 2 into the interior of the hydraulic jacket 2 and is connected to the hydraulic rod by bolts, and one end of the hydraulic jacket 2 is in contact with the side of the support column 3 facing away from the multiple veneers C to be glued.

[0076] In this embodiment, Figure 4-5 As shown, the retractable lock 9 is a retractable cylindrical lock, comprising an outer locking sleeve 10 and an inner locking sleeve 11; the outer locking sleeve 10 is threadedly connected to the inner locking sleeve 11; the inner locking sleeve 11 is located on the inner side of the outer locking sleeve 10, and the pull rod 4 passes through the inner locking sleeve 11 in the retractable lock 9.

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

[0078] In this embodiment, 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 opened in the middle of the elastic steel square pin. The multiple rear holes 13 opened on the pull rod 4 are square holes, and the elastic steel square pin is inserted into the square holes opened on the pull rod 4.

[0079] In this embodiment, Figure 5 As shown, the front side pin 8 is a round pin, and the multiple front side holes 14 opened on the pull rod 4 are round holes, and the round pin is inserted into the round holes opened on the pull rod 4.

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

[0081] In this embodiment, a force sensor for measuring the pressure value of the single board C is arranged on the pressure seat 5. The specific location of the force sensor is not limited. It can be arranged on the side of the pressure seat 5 facing the single board C, or at other locations of the pressure seat 5, as long as the pressure received by the single board C can be detected. The output of the force sensor is connected to the control device, and the control device controls the hydraulic cylinder 1 to work according to 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 the pressure are found, the control device controls the hydraulic rod of the hydraulic cylinder 1 to stop pulling (the control method adopts the existing technology), and further prevents the single board C from plastic deformation due to excessive pressure, and installs a round pin on the pull rod 4 and adjusts the length of the retractable cylindrical lock, so as to provide a suitable and continuous pressure for the single board C. The control device can adopt an intelligent hydraulic controller to control 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 kept within the preset pressure range. Then install the round pin on the pull rod 4 and adjust the length of the retractable cylindrical lock, then remove the hydraulic cylinder 1, the retractable cylindrical lock, the round pin, the elastic steel square pin, and the pressure seat 5 work together to provide suitable and continuous pressure for the single board C, at this time, the hydraulic cylinder 1 can be connected with another pressure strip 4 for operation, and one hydraulic cylinder 1 can operate multiple pull rods 5 separately to achieve pressure on different parts of the single board C, saving the use of the number of hydraulic cylinders 1.

[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 the existing technology, which can be bolt locking, screw nut locking, etc.

[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 the existing technology.

[0084] In this embodiment, the length of the retractable 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 special-shaped beam. The wall thickness of the elastic steel square pin can be replaced according to the single plate of different materials.

[0086] When this embodiment is working, the single board C is transported to a suitable position by the conveyor belt, the pressure seat 5 is moved, and the elastic steel square pin is inserted, so that the pressure seat 5 and the support column 3 can work together to form a stable clamping system to fix the single board C. At this time, the transmission system starts to generate tension, which acts on the pull rod 4 connected to the pressure seat 5. As the pull rod 4 is pulled, the pressure seat 5 begins to apply pressure to the single board. Due to the material and hollow structure of the elastic steel square pin, it will deform when subjected to pressure. This deformation is converted into a uniform and gradually increasing supporting force on the pressure seat 5, so that the pressure seat 5 slowly applies pressure to the single board C, further preventing the rapid application of excessive pressure and causing plastic deformation of the single board C. After reaching a certain pressure value, the position of the elastic steel square pin and the pressure seat is locked by the retractable cylindrical lock and the round pin. At this moment, the supporting force provided by the elastic steel square pin tends to be stable, and its size is sufficient to support the pressure seat 5 to provide effective gluing pressure for the single board C, but not too large to cause plastic deformation of the single board C. Figure 8 (a) is a graph showing the internal stress change of the veneer without the pressure-maintaining device of the present invention. In the actual gluing production process, the use of a conventional plywood press causes plastic deformation of the wood and damage to the internal structure due to improper use of the pressure required for gluing, resulting in a pressure change graph showing a decrease in the pressure required for gluing. However, the pressure-maintaining device of this embodiment prevents the veneer C from undergoing plastic deformation and remains unchanged during the gluing time. The stress change curve is shown in FIG. Figure 8 (b) in . Figure 8 In (a) and (b), the horizontal axis is time (unit s) and the vertical axis is stress (unit pa). Insert the round pin 8 into the corresponding position of the round space of the pull rod 4, adjust the telescopic cylindrical lock 9 to a suitable length, that is, rotate the outer locking sleeve 10 relative to the inner locking sleeve 11, change the axial length of the inner locking sleeve 11 and the outer locking sleeve 10 (that is, the length of the telescopic cylindrical lock 9), so that the inner locking sleeve 11 and the outer locking sleeve 10 of the telescopic cylindrical lock 9, which are far away from each other, respectively abut the round pin 8 and the outer locking sleeve 10 (such as one end of the inner locking sleeve 11 abuts the round pin 8, and one end of the outer locking sleeve 10 abuts the support column 3, or one end of the inner locking sleeve 11 abuts the support column 3, and one end of the outer locking sleeve 10 abuts the round pin 8), ensure the pressure is evenly distributed, and also provide the necessary reaction force support for the subsequent bending process, such as Figure 3 shown.

[0087] Afterwards, if Figure 4 As shown, the bolts at the connection between the hydraulic rod and the tie rod 4 can be removed. Due to the cooperation between the locking and pressing devices, the pressure on the single board C can remain unchanged at this time, providing a suitable and continuous pressure for the single board; move the transmission system to another point of the tie rod, and reconnect the two with bolts; repeat the above operation, as shown in FIG. Figure 7 As shown, each part of the single plate C is gradually made to reach the required bending degree of the special-shaped beam, and the gluing can be completed after maintaining the pressure for a period of time.

[0088] This embodiment also provides a continuous gluing and pressure-maintaining device for preventing plastic deformation of a special-shaped beam, and provides a continuous gluing and pressure-maintaining method. In this method, multiple continuous gluing and pressure-maintaining mechanisms A respectively provide continuous pressure to different parts of multiple veneers C that have been glued and are to be glued; gradually make each part of the multiple veneers C reach the curvature that the special-shaped beam should have. After the multiple veneers C are continuously pressure-maintained for a period of time, the gluing of the multiple veneers C is completed, and a special-shaped beam plywood with a certain curvature is formed;

[0089] Specifically include:

[0090] Step 1: Perform the following operations on the multiple continuous gluing and pressure-maintaining 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 gluing and pressure-maintaining mechanisms A are arranged along the required curvature of the special-shaped beam; after the position of the support column 3 is adjusted, the position of the support column 3 is kept fixed by a locking mechanism;

[0092] Step 1.2: transport multiple veneers C that have been coated with glue and are to be glued to a suitable position, so that the middle part of the veneer C is placed on the upper surface of the base 12 of the support column 3 in the continuous gluing and pressure-maintaining mechanism A arranged in the middle position; and the 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 press seat 5, the support column 3 and the retractable lock 9 in sequence, select a suitable rear hole 13 from the multiple rear holes 13 in the pull bar 4, insert the rear elastic pin 7 into the rear hole 13, and the rear elastic pin 7 abuts against one side of the press seat 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 multiple other veneers C that have been coated with glue and are to be glued on the upper surface of the pull rods 4 in the multiple continuous gluing and pressure-maintaining mechanisms A, and the veneer C is located between the pressure seat 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 rope slide is provided above the plurality of continuous gluing and pressure-maintaining mechanisms A, and the hydraulic cylinder 1 is slidably connected to the rope slide by the rope, and the hydraulic cylinder 1 is rotated in the air by the rope; the hydraulic cylinder 1 is moved, and the hydraulic rod of the hydraulic cylinder 1 is manually connected to the tie rod 4 of the continuous gluing and pressure-maintaining mechanism A arranged in the middle position by bolts, and one end of the hydraulic jacket 2 of the hydraulic cylinder 1 is manually pressed against the side of the support column 3, as shown in FIG. Figure 3 As shown;

[0096] The hydraulic cylinder 1 is started, and the hydraulic rod of the hydraulic cylinder 1 pulls the pull rod 4, and the pull rod 4 drives the rear elastic pin 7 to move, and the rear elastic pin 7 pushes the pressure seat 5 to move in the direction where the plurality of veneers C to be glued are located, and finally the pressure seat 5 contacts the plurality of veneers C to be glued, and applies pressure to the veneers C, so that the pressure seat 5 and the support column 3 work together to clamp and apply pressure to the plurality of 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 according to 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 described in step 2, and adjusts the retractable lock 9 to a suitable length so that one end of the retractable lock 9 abuts against the round pin 8 and the other end abuts against the support column 3 to ensure that the pressure is evenly distributed, providing uniform and continuous stable pressure for the multiple single boards C to be glued;

[0098] Step 4: Disassemble the hydraulic rod of the hydraulic cylinder 1 and the tie bar 4 of the continuous gluing and pressure-maintaining mechanism A at the middle position.

[0099] Then, the hydraulic cylinder 1 is moved by the lifting rope, and the hydraulic rods of the hydraulic cylinder 1 are sequentially connected with the tie bars 4 in different continuous bonding and pressure-maintaining mechanisms A by bolts in the order from the middle position to the positions on both sides, so as to realize the pulling operation of different tie bars 4. That is, the remaining continuous bonding and pressure-maintaining mechanisms A are operated in sequence from the middle position to the positions on both sides according to the methods of step 2 and step 3, so that the multiple continuous bonding and pressure-maintaining mechanisms A respectively provide uniform and continuous pressure to different parts of the multiple veneers C to be bonded. Due to the different positions of the support columns 3, the various parts of the multiple veneers C can achieve the curvature that the special-shaped beam should have, such as Figure 7 As shown ( Figure 7 The continuous gluing and pressure-maintaining mechanism A at the edge shown in the figure has not yet removed the transmission system B, and the other continuous gluing and pressure-maintaining mechanisms A have removed the transmission system B). When all the continuous gluing and pressure-maintaining mechanisms A have removed the transmission system B, and one end of the retractable lock 9 has been pressed against the circular pin 8, and the other end has been pressed against the support column 3, it is ensured that the pressure is evenly distributed, and a uniform and continuous stable pressure is provided for multiple veneers C that have been coated with glue and are to be glued; after a period of pressure maintenance, a special-shaped beam plywood with a certain curvature after gluing is formed. The locking device can be released to take out the special-shaped beam plywood with a certain curvature after gluing. The special-shaped beam plywood will then be subjected to hot pressing and other operations according to actual conditions.

[0100] Of course, in this embodiment, multiple transmission systems B can also be set to realize the pulling of the pull strips 4 in multiple continuous gluing and pressure-maintaining mechanisms A to achieve rapid operation. The transmission system B can slide on the suspension rope slide rail through the suspension rope, and of course, the transmission system B can also be fixed by other existing fixing methods.

[0101] The protection scope of the present invention includes but is not limited to the above embodiments. The protection scope of the present invention shall be based on the claims. Any replacement, deformation, and improvement of the technology that can be easily thought of by technicians in this field shall fall within the protection scope of the present invention.

Claims

1. A continuous gluing and pressure-maintaining method for preventing plastic deformation of a special-shaped beam, characterized in that: A plurality of continuous gluing and pressure-maintaining mechanisms (A) respectively provide continuous pressure to different parts of a plurality of veneers (C) that have been glued and are to be glued; gradually, each part of the plurality of veneers (C) reaches the curvature that the special-shaped beam should have; after the plurality of veneers (C) are continuously pressure-maintained for a period of time, the gluing of the plurality of veneers (C) is completed, and a special-shaped beam plywood with a certain curvature is formed; Wherein, a single continuous gluing and pressure-maintaining mechanism (A) comprises a support column (3), a pull bar (4), a pressure seat (5), a rear elastic pin (7), a front pin (8) and a retractable lock (9); The specific steps include: Step 1: Perform the following operations on the multiple continuous gluing and pressure-maintaining mechanisms (A): Step 1.1: Adjust the position of the support column (3) so that the support columns (3) in the plurality of continuous gluing and pressure-maintaining mechanisms (A) are arranged along the curvature of the special-shaped beam; after the position of the support column (3) is adjusted, keep the position of the support column (3) fixed; Step 1.2: The pull bar (4) is passed through the through gap (15) in the pressure seat (5), the support column (3) and the retractable lock (9) in sequence, and the rear elastic pin (7) is inserted into the rear hole (13) of the pull bar (4), and the rear elastic pin (7) abuts against one side of the pressure seat (5); Step 1.3: placing a plurality of veneers (C) that have been coated with glue and are to be glued between the pressure seat (5) and the support column (3) in the continuous gluing and pressure-maintaining mechanism (A); Step 2: First, pull the pull bar (4) in the continuous gluing and pressure-maintaining mechanism (A) arranged in the middle position, the pull bar (4) drives the rear elastic pin (7) to move, and the rear elastic pin (7) pushes the pressure seat (5) to move in the direction where the plurality of veneers (C) to be glued are located, and finally the pressure seat (5) contacts the plurality of veneers (C) to be glued, exerting pressure on the veneers (C), so that the pressure seat (5) and the support column (3) work together to clamp the plurality of veneers (C) to be glued; Step 3: Insert the front pin (8) into the front hole (14) of the tie bar (4) described in step 2, and adjust the retractable lock (9) to a suitable length so that one end of the retractable lock abuts against the round pin (8) and the other end abuts against the support column (3), ensuring that the pressure is evenly distributed, thereby providing even and continuous pressure for the plurality of veneers (C) to be glued; Step 4: Operate the remaining continuous gluing and pressure-maintaining mechanisms (A) in sequence according to the methods of steps 2 and 3, so that the multiple continuous gluing and pressure-maintaining mechanisms (A) respectively provide uniform and continuous pressure to different parts of the multiple veneers (C) to be glued, and make each part of the multiple veneers (C) reach the required bending curvature of the special-shaped beam. After a period of pressure maintenance, a special-shaped beam plywood with a completed gluing and a certain bending curvature is formed.

2. The continuous gluing and pressure-maintaining method for preventing plastic deformation of a special-shaped beam according to claim 1, characterized in that: The single continuous gluing and pressure-maintaining mechanism (A) also includes a slide rail (6), 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 a locking mechanism is provided between the base (12) and the slide rail (6).

3. The continuous gluing and pressure-maintaining method for preventing plastic deformation of a special-shaped beam according to claim 2, characterized in that: The following steps are also included between step 1.1 and step 1.2: Step 1.1a: placing the middle parts of a plurality of veneers (C) coated with glue and to be glued on the upper surface of the base (12) at the bottom of the support column (3) in the continuous gluing and pressure-maintaining mechanism (A) arranged in the middle position; and the veneer (C) is located between the pressure seat (5) and the support column (3); The bracing strip (4) in step 1.2 is located above the single board (C) in step 1.1a; The step 1.3 is specifically as follows: Placing a plurality of other veneers (C) that have been coated with glue and are to be glued on the upper surface of the pull bars (4) in the plurality of continuous gluing and pressure-maintaining mechanisms (A), with the veneers (C) being located between the pressure seat (5) and the support column (3); The single board (C) in step 1.3 is located directly above the single board (C) in step 1.1a.

4. The continuous gluing and pressure-maintaining method for preventing plastic deformation of a special-shaped beam according to claim 1, characterized in that: The pull rod (4) is pulled by a transmission system (B), and the transmission system (B) comprises a hydraulic cylinder (1), and a hydraulic rod of the hydraulic cylinder (1) is connected to one end of the pull rod (4) by bolts.

5. The continuous gluing and pressure-maintaining method for preventing plastic deformation of a special-shaped beam according to claim 4, characterized in that: In the transmission system (B), the outside of the hydraulic cylinder (1) is fixedly connected to a hydraulic jacket (2), the interior of the hydraulic jacket (2) is a cavity, the hydraulic rod of the hydraulic cylinder (1) is located inside the hydraulic jacket (2), one end of the pull rod (4) extends from an opening at one end of the hydraulic jacket (2) into the interior of the hydraulic jacket (2) and is connected to the hydraulic rod by bolts, and one end of the hydraulic jacket (2) is in contact with the side of the support column (3) facing away from the plurality of veneers (C) to be glued.

6. The continuous gluing and pressure-maintaining method for preventing plastic deformation of a special-shaped beam according to claim 5, characterized in that: A suspension rope slide rail is arranged above the plurality of continuous gluing and pressure-maintaining mechanisms (A), the hydraulic cylinder (1) is slidably connected to the suspension rope slide rail via a suspension rope, and the hydraulic cylinder (1) is rotated in the air via the suspension rope; The step 2 is specifically as follows: Move the hydraulic cylinder (1), manually connect the hydraulic rod of the hydraulic cylinder (1) to the tie bar (4) of the continuous bonding and pressure-maintaining mechanism (A) arranged in the middle position through bolts, and manually make one end of the hydraulic jacket (2) of the hydraulic cylinder (1) contact the side of the support column (3); The hydraulic cylinder (1) is started, and the hydraulic rod of the hydraulic cylinder (1) pulls the pull rod (4), and the pull rod (4) drives the rear elastic pin (7) to move, and the rear elastic pin (7) pushes the pressure seat (5) to move in the direction where the plurality of veneers (C) to be glued are located, and finally the pressure seat (5) contacts the plurality of veneers (C) to be glued, and generates pressure on the veneers (C), so that the pressure seat (5) and the support column (3) work together to clamp the plurality of veneers (C) to be glued; The step 4 further comprises: The hydraulic rod of the hydraulic cylinder (1) and the pull rod (4) of the continuous gluing and pressure maintaining mechanism (A) arranged in the middle position are disassembled, and then the hydraulic cylinder (1) is moved, and the hydraulic rod of the hydraulic cylinder (1) is respectively connected with the pull rods (4) in different continuous gluing and pressure maintaining mechanisms (A) in the order from the middle position to the positions on both sides by bolts, so as to realize the pulling of different pull rods (4).

7. The continuous gluing and pressure-maintaining method for preventing plastic deformation of a special-shaped beam according to claim 1, characterized in that: In the continuous gluing and pressure-maintaining mechanism (A), the retractable lock (9) comprises an outer locking sleeve (10) and an inner locking sleeve (11); the outer locking sleeve (10) is threadedly connected to the inner locking sleeve (11); the inner locking sleeve (11) is located on the inner side of the outer locking sleeve (10), the pull rod (4) passes through the inner locking sleeve (11) in the retractable lock (9), and the retractable lock (9) can extend to the inner side of one end of the hydraulic jacket (2) on the hydraulic cylinder (1).

8. The continuous gluing and pressure-maintaining method for preventing plastic deformation of a special-shaped beam according to claim 1, characterized in that: In the continuous gluing and pressure-maintaining mechanism (A), the rear elastic pin (7) is an elastic steel square pin, a hollow structure is provided in the middle of the elastic steel square pin, and the multiple rear holes (13) opened on the pull rod (4) are square holes, and the elastic steel square pin is inserted into the square holes opened on the pull rod (4).

9. The continuous gluing and pressure-maintaining method for preventing plastic deformation of a special-shaped beam according to claim 1, characterized in that: In the continuous gluing and pressure-maintaining mechanism (A), the front side pin (8) is a circular pin, the plurality of front side holes (14) opened on the pull rod (4) are circular holes, and the circular pin is inserted into the circular holes opened on the pull rod (4).

10. The continuous gluing and pressure-maintaining method for preventing plastic deformation of a special-shaped beam according to claim 1, characterized in that: A force sensor for measuring the pressure value of the single plate (C) is arranged on the pressure seat (5), and the output of the force sensor is connected to a control device. The control device controls the action of the hydraulic cylinder (1) according to the pressure value of the single plate (C) measured by the force sensor.

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