An intelligent continuous pressure maintaining control device and method for improving mechanical properties of CLT glued wood

Abstract

The application provides an intelligent continuous pressure maintaining control device and method for improving the mechanical property of CLT glued wood, which pressurizes and maintains the pressure of the glued wood, is efficient, saves time and labor, and makes the internal stress of the glued wood product uniform. The control device is characterized in that a pull rod extends through a column and a pressure seat, a locking baffle is connected to the rear end of the pull rod, the front and rear ends of the column are provided with front and rear side plates extending to both sides, the glued wood is placed between the rear side plate and the front part of the pressure seat, an eccentric wheel is eccentrically connected to the side of the pull rod, the outer circumferential surface of the eccentric wheel is in contact with the front part of the front side plate, a driving device drives the eccentric wheel to eccentrically rotate around a pin shaft, and the glued wood is pressed. A force sensor is arranged between the front and rear side plates, if the pressure at a later time is smaller than that at a previous time, the control driving device is reversely driven to reversely rotate the eccentric wheel, the pressure on the glued wood is reduced, and the pressure is kept unchanged during the gluing time.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of wood processing, and serves large-scale structural wood gluing process, and particularly relates to an intelligent continuous pressure maintaining control device for improving the mechanical properties of CLT glued wood, and aims to improve the mechanical properties of large-scale CLT structural wood finished products. BACKGROUND

[0002] Cross-laminated timber (CLT) is increasingly booming at home and abroad due to its advantages of low carbon energy saving, mechanical properties and industrialized prefabrication, which not only helps to solve the major negative impact of buildings on the environment, but also provides a new way for more economic and efficient structures with less resource consumption and easy reuse.

[0003] The feasibility of the effective promotion and application of cross-laminated timber (CLT) building materials lies in the feasibility of its mechanical properties. In order to ensure that CLT can maintain load transfer and durability during the service life, it is crucial to effectively evaluate the gluing quality of CLT glue layer, and the shear strength of the glue layer is an important indicator for evaluating the gluing quality of CLT.

[0004] Suppose that the curing time of the glue during the preparation of CLT is t, then the gluing pressure required by the CLT structural wood within t time is 74-93kN, but in the actual gluing production process of CLT cross-laminated timber, the pressure required for gluing is not used properly, which causes plastic deformation of wood, resulting in a sudden and significant decay of the pressure required for gluing (as shown in Figure 1 ), which cannot meet the gluing quality, and of course cannot guarantee the mechanical properties of CLT glued wood. In actual CLT production, artificial experience is used to re-press each section one by one, which is the current conventional way, which not only consumes time and labor, but also causes uneven gluing pressure in each section, which easily causes local cracking of the gluing surface of the structural wood finished product. SUMMARY

[0005] The technical problem to be solved by the present application is to solve the problem of uneven gluing pressure in each section caused by artificial experience for pressing the structural wood, which easily causes the gluing surface of the CLT glued wood finished product to crack, and to provide an intelligent continuous pressure maintaining control device for improving the mechanical properties of CLT glued wood, which drives the eccentric wheel to rotate eccentrically by using a driving device, pulls the pull rod, locking baffle and pressure seat forward, and pressurizes and maintains the pressure of the CLT glued wood, which is efficient, time-saving and labor-saving, and makes the internal stress of the CLT glued wood finished product uniform and has good mechanical properties.

[0006] To achieve the above technical purpose, the technical scheme adopted by the present application is as follows:

[0007] The application discloses an intelligent continuous pressure maintaining control device for improving the mechanical property of CLT glued wood, a pull rod 4 passes through a gap in front of and behind a stand 1, a pressing base 9 extends in front of and behind the stand 1, a rear end of the pull rod 4 located behind the pressing base 9 is connected with locking baffle plates 19 extending to the rear part of the pressing base 9, front side plates and rear side plates extending to both sides are arranged at the front end and the rear end of the stand 1, the CLT glued wood 8 is arranged between the rear side plate and the front part of the pressing base 9, eccentric wheels 31 are eccentrically connected to the side of the pull rod 4 through pin shafts, the outer circumferential surface of the eccentric wheel 31 is in contact with the front part of the front side plate, and a driving device connected with the eccentric wheel 31 is arranged on the stand so as to drive the eccentric wheel to eccentrically rotate around the pin shaft, and the CLT glued wood 8 between the rear side plate and the pressing base 9 is pressed.

[0008] The intelligent continuous pressure maintaining control device is provided with a force sensor 10 arranged between the front side plate and the rear side plate and used for reflecting the pressure value of the CLT glued wood 8, the output of the force sensor 10 is connected with a control device, the control device controls the driving device to act according to the pressure value of the CLT glued wood 8 measured by the force sensor 10, so that the CLT glued wood 8 is elastically deformed without plastic deformation.

[0009] The intelligent continuous pressure maintaining control device is provided with two same eccentric wheels 31 coaxially connected to the two sides of the pull rod 4, long arms 32 are fixed on the two eccentric wheels 31, and connecting rods 33 are connected between the two long arms, and the connecting rods 33 are hingedly connected with the driving device.

[0010] The intelligent continuous pressure maintaining control device is provided with a hydraulic cylinder or a gas cylinder as the driving device, and a hydraulic controller used for controlling the hydraulic cylinder or the gas cylinder as the control device.

[0011] The intelligent continuous pressure maintaining control device is provided with the eccentric wheel 31 with the same length in the axial direction as the width of the front side plate in contact with the eccentric wheel 31.

[0012] The intelligent continuous pressure maintaining control device is provided with the stand 1, the front side plate and the rear side plate being integrated and made of spring steel material.

[0013] The intelligent continuous pressure maintaining control device is provided with the pull rod 4 made of elastic steel material.

[0014] The intelligent continuous pressure maintaining control device is provided with a rectangular hole passing through the locking baffle plate 19 and arranged at the rear end of the pull rod 4.

[0015] The intelligent continuous pressure maintaining control device is provided with equidistant holes for inserting pin shafts and arranged at the front part of the pull rod 4.

[0016] The application also provides an intelligent continuous pressure maintaining control method for improving the mechanical properties of CLT glued wood, which can ensure that the pressure on the CLT glued wood during the gluing process does not exceed the pressure causing plastic deformation, ensure the consistency of the gluing pressure, and make the internal stress of the CLT glued wood product uniform as a whole.

[0017] The intelligent continuous pressure maintaining control method for improving the mechanical properties of CLT glued wood adopts the above-mentioned intelligent continuous pressure maintaining control device, drives the driving device to press the CLT glued wood, and the force sensor 10 detects the pressure on the CLT glued wood in real time and transmits it to the control device. If the pressure y2 on the CLT glued wood at the next moment t2 is smaller than the pressure y1 at the previous moment t1, the control device controls the driving device to reverse the action and drive the eccentric wheel to reverse rotation, so as to reduce the pressure on the CLT glued wood, so that the pressure on the CLT glued wood is slightly smaller than y1, and remains unchanged within the gluing time.

[0018] The application has the following beneficial effects:

[0019] The key to the feasibility of the effective popularization and application of orthogonal glued wood (CLT) building materials lies in whether the mechanical properties are uniform and reliable. In order to ensure that the CLT can maintain load transmission and durability during the service life, the application provides an intelligent continuous pressure maintaining control device for the structure wood product gluing surface prone to cracking caused by uneven gluing pressure at each section due to artificial pressing of the CLT relying on experience. The device adopts a driving device to press and maintain the pressure on the CLT glued wood, which is efficient, time-saving and labor-saving, and makes the internal stress of the CLT glued wood product uniform as a whole.

[0020] Especially when the force sensor is arranged, the control device controls the driving device in real time according to the pressure detected by the force sensor, adjusts the forward and reverse rotation of the eccentric wheel, ensures that the pressure is maintained in the interval (such as 74-93kN) where no plastic deformation occurs and the pressure is relatively high within the curing time of the glued wood glue layer, ensures the gluing quality and uniformity of the glued wood, makes the internal stress of the structure wood product uniform as a whole, and further improves the mechanical properties.

[0021] On the premise of arranging the eccentric pressing mechanism, the application transmits the pressure on the pressure surface of the CLT glued wood to the side wall surface (front side plate and rear side plate) of the column 1 according to the force conduction principle, installs a force sensor on the inner side of the wall surface (i.e. between the front side plate and the rear side plate) for real-time detection of the pressure value. Once the pressure decays, it is immediately transmitted to the control device to control the action of the driving device. For example, an intelligent hydraulic controller (a kind of control device) is used to control the extension amount of the hydraulic cylinder (a kind of driving device) through the pressure maintaining program, so that the pressure is maintained between 74-93kN within the curing time of the glue. Of course, special attention should be paid to the fact that each kind of glue has different curing time. The operator can input the curing time into the intelligent hydraulic controller according to the curing characteristics of the glue.

[0022] Of course, the driving device can be a cylinder or other driving device in addition to the hydraulic cylinder, as long as it can drive the eccentric wheel to rotate around the pin shaft.

[0023] The application applies the intelligent continuous pressing device to improve the standardized production scale of CLT and solve the pain point of uneven mechanical properties of existing CLT engineering materials, and has very important engineering value for the transformation and upgrading of the CLT manufacturing mode. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a pressure change graph of the pressure required for gluing due to plastic deformation of wood caused by improper use of the pressure required for gluing in the actual gluing production process of CLT glued wood, resulting in attenuation of the pressure required for gluing.

[0025] Figure 2 It is a pressure change graph of the pressure applied to the CLT glued wood by the intelligent continuous pressure maintaining control device of the application.

[0026] Figure 3 It is a schematic diagram of the intelligent continuous pressure maintaining control device in use.

[0027] Figure 4 It is another schematic diagram of the intelligent continuous pressure maintaining control device in use.

[0028] Figure 5 It is a perspective view of the stand.

[0029] Figure 6 It is a perspective view of the eccentric pressing rod.

[0030] Figure 7 It is a perspective view of the pull rod.

[0031] Figure 8 It is a perspective view of the pressing seat. DETAILED DESCRIPTION

[0032] The specific embodiments of the application will be further described below according to the accompanying drawings:

[0033] Referring to Figure 1 The intelligent continuous pressure maintaining control device for improving the mechanical properties of CLT glued wood shown in the figure comprises a stand 1, a hydraulic cylinder 2, an eccentric pressing rod 3, a pull rod 4, a supporting base 5, a hydraulic station 6, an intelligent hydraulic controller 7, CLT glued wood 8, a pressing seat 9, a force sensor 10, and a locking baffle 19.

[0034] The pull rod 4 is made of elastic steel material, the rear end of the pull rod 4 is provided with a plurality of different rectangular holes 41 through the locking baffle 19, and the front end is provided with equidistant circular holes 42 for inserting the pin shaft. The pull rod 4 extends through the front and rear gaps 11 in the column 1 and the front and rear of the pressing seat 9, and extends to the rear of the pressing seat 9 through the locking baffle 19 of the rectangular hole 41.

[0035] The column 1 is made of spring steel material, and the front and rear ends of the column 1 are integrally provided with front and rear side plates 12 and 13 extending to both sides. The CLT glued wood 8 is placed above and below the pull rod 4 between the rear side plate 13 and the front of the pressing seat 9.

[0036] Two symmetrical eccentric wheels 31 are connected to the two side faces of the pull rod 4 through a pin shaft passing through the circular hole 42, the outer circumferential surface of the eccentric wheel 31 is in contact with the front of the front side plate 12, and the length (or thickness) of each eccentric wheel 31 in the axial direction is the same as the width of the front side plate 12 in contact with it. Each eccentric wheel 31 is fixed with a long arm 32, and the connecting rod 33 is connected between the two long arms. The middle of the connecting rod 33 is hinged to the piston rod of the hydraulic cylinder 2, and the cylinder body of the hydraulic cylinder is hinged to the upper part of the column.

[0037] When the piston rod of the hydraulic cylinder is extended, the eccentric wheel 31 is driven to rotate clockwise, the pull rod 4 moves forward, and the locking baffle 19 and the pressing seat 9 are driven by the pull rod 4 to move forward to press the CLT glued wood 8 between the rear side plate and the pressing seat 9. When the piston rod of the hydraulic cylinder is retracted, the eccentric wheel 31 is driven to rotate counterclockwise, and the CLT glued wood 8 is loosened.

[0038] A force sensor 10 for reflecting the pressure of the CLT glued wood 8 is arranged between the front side plate 12 and the rear side plate 13, the output of the force sensor 10 is connected to the intelligent hydraulic controller 7, and the intelligent hydraulic controller 7 controls the action of the hydraulic cylinder 2 according to the pressure value of the CLT glued wood 8 measured by the force sensor 10, so that the pressure of the CLT glued wood 8 causes elastic deformation without plastic deformation, that is, the pressure range is 74-93kN.

[0039] When the pressure on the CLT glued wood starts to be applied, the intelligent hydraulic controller 7 controls the action of the hydraulic cylinder 2 to gradually pressurize the CLT glued wood 8, the force sensor 10 detects the pressure of the CLT glued wood in real time and transmits it to the intelligent hydraulic controller 7, if the pressure y2 received by the CLT glued wood at the next time t2 is smaller than the pressure y1 received at the previous time t1, it indicates that the CLT glued wood begins to deform plastically, at this time the intelligent hydraulic controller 7 controls the piston rod of the hydraulic cylinder to retract slightly, drives the eccentric wheel to rotate counterclockwise, reduces the pressure of the CLT glued wood, so that the pressure of the CLT glued wood is slightly smaller than y1, the CLT glued wood no longer deforms plastically, and remains unchanged within the gluing time. The pressure change curve is shown in Figure 2 .

[0040] The column 1 is fixedly connected with the support base 5, the column 1 is made of spring steel material, high yield point and fatigue resistance are ensured under pressure, the side of the column 1 needs to be designed as a groove structure, the force sensor 10 is arranged, and the groove edge has a certain thickness, which should satisfy that the yield point is higher than that of the CLT structure wood. The stress surface of the column 1 is provided with a long strip-shaped gap 11, the pull rod 4 passes through the gap, and the top of the column 1 is connected with the hydraulic cylinder 2 in a hinged form. The column 1 and the support base 5 can be fixed as a whole through welding, or the column 1 and the support base 5 can be relatively fixed in the working state through cooperation of threads and screws, and the column 1 can move on the support base 5 in the non-working state.

[0041] As shown in Figure 3 and 6 , the eccentric compression rod 3 is composed of an eccentric wheel 31 and a long arm 32, the eccentric wheel 31 is hinged with the pull rod 4 through a pin shaft, and the top end of the long arm 32 is connected with the hydraulic cylinder 2 in a hinged form through a connecting rod. The thickness (the size in the axis direction of the eccentric wheel 31) of the eccentric wheel 31 of the eccentric compression rod 3 is greater than the thickness of the long arm 32, and the side surface of the eccentric wheel 31 is flush with the side edge of the column 1, so that the pressure generated by the eccentric wheel 31 can make the side edge of the column 1 effectively elastically deform;

[0042] As shown in Figure 3 and 7 , the pull rod 4 is made of elastic steel material, a rectangular hole 41 is formed at the root of the pull rod 4, the pull rod 4 is arranged at equal intervals, and a circular hole 42 is formed in the main body of the pull rod 4 to satisfy the demand of different thicknesses of CLT structure wood glue.

[0043] As shown in Figure 2 , 3 , the intelligent hydraulic controller 7 is connected with the force sensor 10 and the hydraulic station 6 respectively, the force value obtained by the force sensor 10 can be collected in real time, the force value is input into a pressure maintaining program, the output value of the pressure maintaining program is used to control the adjustment of the hydraulic pressure of the hydraulic cylinder 2 by the hydraulic station 6, the hydraulic cylinder 2 is elongated, the eccentric compression rod 3 starts to extrude the column 1, and force is transmitted to the 8 CLT structure wood, so that the stress interval of the 8 CLT structure wood is kept at 74-93 kN within t time.

[0044] As shown in Figure 3 and 8 , the pressure seat 9 is provided with a hole in the pressure surface, the pull rod 4 is arranged, and the 8 CLT structure wood is subjected to gluing pressure under the pressing and clamping of the pull rod 4 and the locking baffle 19.

[0045] The application can improve the standardized production scale of CLT by using the intelligent continuous pressing device, solve the pain points of uneven mechanical properties of existing CLT engineering materials, and promote the transformation and upgrading of the CLT manufacturing mode.

[0046] The protection scope of the present application includes but is not limited to the above embodiments, the protection scope of the present application is subject to the claims, any replacement, method, deformation, improvement of the present technology that is easily thought of by the skilled in the art falls within the protection scope of the present application.

Claims

1. An intelligent sustained pressure control method for improving the mechanical properties of CLT glued laminated wood, characterized in that: The intelligent continuous pressure maintaining control device comprises a pull rod (4), a stand (1), a pressure seat (9), a locking baffle (19), an eccentric wheel (31) and a force sensor (10). The pull rod (4) passes through the front-to-rear gap in the stand (1) and extends forward and backward in the pressure seat (9). The rear end of the pull rod (4) located behind the pressure seat (9) is connected with the locking baffle (19) extending to the rear part of the pressure seat (9) on both sides. The stand (1) has front and rear side plates extending to both sides at the front and rear ends. The CLT glued wood (8) is placed between the rear side plate and the front part of the pressure seat (9). The eccentric wheel (31) is eccentrically connected to the side of the pull rod (4) through a pin shaft. The outer periphery of the eccentric wheel (31) is in contact with the front part of the front side plate. A driving device is arranged on the stand to drive the eccentric wheel (31) to eccentrically rotate around the pin shaft. The driving device drives the eccentric wheel (31) to eccentrically rotate, and the pull rod (4) moves forward to press the CLT glued wood (8) between the rear side plate and the pressure seat (9). Two identical eccentric wheels (31) are coaxially connected to the two sides of the pull rod (4). The two eccentric wheels (31) are fixed with long arms (32). The connecting rods (33) are connected between the two long arms. The connecting rods (33) are hingedly connected with the driving device. The force sensor (10) is arranged between the front and rear side plates to reflect the pressure of the CLT glued wood (8). The output of the force sensor (10) is connected to the control device. The control device controls the driving device to act according to the pressure value of the CLT glued wood (8) measured by the force sensor (10), so that the CLT glued wood (8) is elastically deformed without plastic deformation. The intelligent continuous pressure maintaining control method drives the driving device to press the CLT glued wood. The force sensor (10) detects the pressure of the CLT glued wood in real time and transmits the pressure to the control device. If the pressure y2 of the CLT glued wood at the next time t2 is smaller than the pressure y1 at the previous time t1, the control device controls the driving device to reverse the action, drives the eccentric wheel to reverse the rotation, reduces the pressure of the CLT glued wood, and makes the pressure of the CLT glued wood slightly smaller than y1 and keeps unchanged during the gluing time.

2. The intelligent hold pressure control method of claim 1, wherein: The driving device is a hydraulic cylinder or a gas cylinder, and the control device is a hydraulic controller for controlling the hydraulic cylinder or the gas cylinder.

3. The intelligent hold pressure control method of claim 1, wherein: The length of the eccentric wheel (31) in the axial direction is the same as the width of the front side plate in contact with the eccentric wheel (31).

4. The intelligent hold pressure control method of claim 1, wherein: The stand (1), the front side plate and the rear side plate are integrated and made of spring steel.

5. The intelligent hold pressure control method of claim 1, wherein: The pull rod (4) is made of elastic steel.

6. The intelligent hold pressure control method of claim 1, wherein: The rear end of the pull rod (4) is provided with a rectangular hole passing through the locking baffle (19).

7. The intelligent hold pressure control method of claim 1, wherein: The front part of the pull rod (4) is provided with equidistant holes for inserting the pin shaft.

Images