Device for measuring long-term tensile strength of a recombinant bamboo structure beam-column

Abstract

The present invention relates to the technical field of green bamboo building materials, and specifically to a device for measuring the long-term tensile strength of a recombinant bamboo structure beam-column, which includes a base. A test frame is fixed on the base. A lifting plate is slidably connected to the test frame. A bottom plate parallel to the lifting plate is arranged below the lifting plate. Through holes for the beam-column to pass through are respectively formed in the middle parts of the lifting plate and the bottom plate. The lifting plate and the bottom plate are connected by a hydraulic cylinder. Two sets of symmetrically arranged positioning components are arranged between the lifting plate and the bottom plate. A connecting rope is connected between the two sets of positioning components. The two sets of positioning components are respectively connected to the lifting plate and the bottom plate. The present invention can perform segmented tensile strength measurement on different regions of a relatively long recombinant bamboo structure beam-column to obtain more detailed and specific strength measurement results, and there is no need to set up an additional power driving device, so that the tensile strength measurement work and the adjustment of the measurement position are linked and coordinated, which is beneficial to improving the measurement efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of green bamboo building materials, and specifically to a device for measuring the long-term tensile strength of a recombinant bamboo structure beam-column. Background Technique

[0002] Recombinant composite structural bamboo is a new type of bamboo composite material made from bamboo through rolling, drying, impregnating with glue, and pressing. Since recycled bamboo furniture has excellent material properties, natural wood grain texture, and easy processability, and is a sustainable green material, recycled bamboo will be more widely used in furniture, providing strong material support for the development of furniture. Since recombinant composite structural bamboo is a typical biomass material, its strength will decrease under long-term loads. Determining the long-term strength index of recombinant composite structural bamboo is a prerequisite for its application in the field of building structures.

[0003] Currently, for the device for measuring the long-term tensile strength of a recombinant bamboo structure beam-column, the uniaxial tension method is mostly used. Tensile stress is applied at both ends of the recombinant bamboo structure beam-column, and the tensile strength is calculated through the area of the fracture surface and the tensile stress at the time of fracture. However, there are problems such as stress concentration and eccentric force in the uniaxial tension method. Moreover, the recombinant bamboo structure beam-column is large in length and volume, and it is difficult to align its two ends with the pull rod, easily generating a large eccentric force and stress concentration points, which affect the test results. And in the prior art, there is no device for segmental measurement of different regions of the recombinant bamboo structure beam-column, and it is impossible to obtain the tensile strength data of different regions of the recombinant bamboo structure beam-column, making it difficult to obtain more detailed and specific measurement results. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides a device for measuring the long-term tensile strength of a recombinant bamboo structure beam-column. By fixing and positioning the position of the recombinant bamboo structure beam-column, problems such as concentrated stress and eccentric force are avoided. By performing segmented tensile strength measurement on different regions of the longer recombinant bamboo structure beam-column, more detailed and specific strength measurement results can be obtained, so as to solve the problems raised in the above background technique.

[0005] To achieve the above object, the present invention provides the following technical solution:

[0006] A device for measuring the long-term tensile strength of a recombinant bamboo structure beam-column, including a base, a test frame is fixed on the base, a lifting plate is slidably connected to the test frame, a bottom plate parallel to the lifting plate is arranged below the lifting plate, through holes for the beam-column to pass through are respectively opened in the middle parts of the lifting plate and the bottom plate, the lifting plate and the bottom plate are connected by a hydraulic cylinder, two groups of symmetrically arranged positioning components are arranged between the lifting plate and the bottom plate, a connecting rope is connected between the two groups of positioning components, and the two groups of positioning components are respectively connected to the lifting plate and the bottom plate;

[0007] The positioning assembly includes a fixed cylinder, an annular plate, a rotating collar, a first gear, a rotating shaft, a wire winding wheel and a number of fasteners. The fixed cylinder is fixedly connected to the lifting plate, the annular plate is fixedly connected to the end of the fixed cylinder, the rotating collar is rotatably connected to the annular plate, the rotating shaft is rotatably connected through the annular plate, the first gear and the wire winding wheel are respectively fixed to the upper end and the lower end of the rotating shaft, a tooth groove is provided on the outer peripheral side wall of the rotating collar, and the tooth groove meshes with the first gear. A number of the fasteners are arranged in an annular array on the fixed cylinder;

[0008] Both ends of the connecting rope are respectively wound around the wire winding wheels in two groups of positioning assemblies. The rotating shaft is connected to the annular plate through a disc spring, so that the connecting rope is always in a taut state;

[0009] A stepping assembly for adjusting the height of the lifting plate is provided on the test stand. The stepping assembly is connected to the rotating collar. By rotating the rotating collar, the lifting plate is intermittently lifted upward to achieve the purpose of adjusting the measurement position.

[0010] Preferably, the fastener includes an arc-shaped plate, a spring, a connecting block and a wedge-shaped block. The arc-shaped plate is connected to the inner wall of the fixed cylinder through a spring. The connecting block penetrates and is slidably connected to the fixed cylinder and is fixed to the arc-shaped plate. The wedge-shaped block is fixed to the inner ring side wall of the rotating collar, and a slope matching the wedge-shaped block is provided on the connecting block.

[0011] Preferably, a fixed pulley is fixed on the annular plate, and the connecting rope is arranged bypassing the fixed pulley.

[0012] Preferably, a pressure sensor is installed at the output end of the hydraulic cylinder at the bottom of the bottom lifting plate.

[0013] Preferably, the stepping assembly includes racks fixed on both side walls of the test stand. The lifting plate is provided with a driving shaft, and second gears are fixed at both ends of the driving shaft. The second gears mesh with the racks.

[0014] Preferably, a rotating seat is fixed on the upper surface of the lifting plate, and the driving shaft is rotatably connected to the rotating seat.

[0015] Preferably, the stepping assembly further includes a worm rotatably connected through the lifting plate. A third gear is fixed to the lower end of the worm through a one-way bearing. The third gear meshes with the rotating collar. A worm gear is fixed on the driving shaft, and the worm gear meshes with the worm.

[0016] Preferably, a control console is provided on the base, and the hydraulic cylinder and the pressure sensor are both electrically connected to the control console.

[0017] Preferably, ratchet teeth are provided on the side wall of the test stand, and a toothed plate matching the ratchet teeth is connected to the lifting plate through a compression spring.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] 1. By providing a fixed cylinder and fasteners, during the measurement work, the fixed cylinder is sleeved on the beam-column, and each fastener synchronously approaches the beam-column and compresses and fixes it, so that the center line of the beam-column coincides with the axis of the fixed cylinder, which can fix and position the position of the laminated bamboo structure beam-column, avoid problems such as concentrated stress and eccentric force, and ensure the accuracy of the measurement results.

[0020] 2. By providing a rotating collar, a first gear, a wire winding wheel and a connecting rope, when the hydraulic cylinder pushes the bottom plate away from the lifting plate for tensile measurement, the moving collar can rotate synchronously, and then drive the fasteners to compress and fix the beam-column, realizing automatic fixing of the measurement position of the beam-column, without manual operation and positioning, with a compact structure and high automation degree.

[0021] 3. By providing a stepping component, with the rotating collar as the driving force, the lifting plate intermittently moves up a certain distance during the measurement process, and then the tensile strength of different regions of a longer laminated bamboo structure beam-column can be measured in a segmented manner, so as to obtain more detailed and specific strength measurement results, and there is no need to set up an additional power driving device, so that the tensile strength measurement work and the adjustment of the measurement position are linked and coordinated, which is beneficial to improving the measurement efficiency. Description of the Drawings

[0022] Figure 1 is a schematic structural diagram of the present invention;

[0023] Figure 2 is a schematic sectional structural diagram of the present invention;

[0024] Figure 3 is Figure 2 the enlarged view at A in

[0025] Figure 4 is Figure 3 the enlarged view at B in

[0026] Figure 5 is Figure 2 the enlarged view at C in

[0027] Figure 6 is a schematic top view structural diagram of the positioning component in the present invention.

[0028] In the figure: 1 base, 2 test stand, 3 lifting plate, 4 bottom plate, 5 through hole, 6 hydraulic cylinder, 7 positioning assembly, 8 connecting rope, 9 fixed cylinder, 10 annular plate, 11 rotating collar, 12 first gear, 13 rotating shaft, 14 wire winding wheel, 15 fastener, 16 disc spring, 17 stepping assembly, 18 arc plate, 19 spring, 20 connecting block, 21 wedge block, 22 fixed pulley, 23 pressure sensor, 24 rack, 25 drive shaft, 26 second gear, 27 rotating seat, 28 worm, 29 one-way bearing, 30 third gear, 31 worm gear, 32 ratchet teeth, 33 compression spring, 34 toothed plate, 35 control console. Specific implementation mode

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. The described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0030] Please refer to Figures 1 to 6 , the present invention provides a device for measuring the long-term tensile strength of a glued laminated bamboo structure beam column, and the technical solution is as follows:

[0031] A device for measuring the long-term tensile strength of a glued laminated bamboo structure beam column includes a base 1. A test stand 2 is fixed on the base 1. A lifting plate 3 is slidably connected to the test stand 2. It should be noted that ratchet teeth 32 are provided on the side wall of the test stand 2. A toothed plate 34 matching the ratchet teeth 32 is connected to the lifting plate 3 through a compression spring 33. The compression spring 33 presses the toothed plate 34 against the ratchet teeth 32. During the measurement work, the lifting plate 3 can only drive the toothed plate 34 to move upward along the ratchet teeth 32. After the measurement work is completed, the toothed plate 34 is squeezed by hand to separate the toothed plate 34 from the ratchet teeth, and the lifting plate 3 is pushed downward to reset for the next measurement work.

[0032] A bottom plate 4 parallel to the lifting plate 3 is provided below the lifting plate 3. Through holes 5 for the beam column to pass through are provided in the middle of the lifting plate 3 and the bottom plate 4. The lifting plate 3 and the bottom plate 4 are connected by a hydraulic cylinder 6. A pressure sensor 23 is installed at the output end of the hydraulic cylinder 6 at the bottom of the lifting plate 3. A control console 35 is provided on the base 1. The hydraulic cylinder 6 and the pressure sensor 23 are both electrically connected to the control console 35. Two groups of symmetrically arranged positioning assemblies 7 are provided between the lifting plate 3 and the bottom plate 4. A connecting rope 8 is connected between the two groups of positioning assemblies 7. The two groups of positioning assemblies 7 are respectively connected to the lifting plate 3 and the bottom plate 4.

[0033] The positioning assembly 7 includes a fixed cylinder 9, an annular plate 10, a rotating collar 11, a first gear 12, a rotating shaft 13, a wire winding wheel 14 and a number of fasteners 15. The fixed cylinder 9 is fixedly connected to the lifting plate 3. The annular plate 10 is fixedly connected to the end of the fixed cylinder 9. The rotating collar 11 is rotatably connected to the annular plate 10. The rotating shaft 13 passes through and is rotatably connected to the annular plate 10. The first gear 12 and the wire winding wheel 14 are respectively fixed to the upper end and the lower end of the rotating shaft 13. Tooth grooves are provided on the outer peripheral side wall of the rotating collar 11, and the tooth grooves are meshed with the first gear 12. A number of fasteners 15 are arranged in an annular array on the fixed cylinder 9. A fixed pulley 22 is fixed on the annular plate 10. The connecting rope 8 is arranged around the fixed pulley 22. The fixed pulley 22 is used for guiding the connecting rope 8. The two ends of the connecting rope 8 are respectively wound around the wire winding wheels 14 in the two groups of positioning assemblies 7. The rotating shaft 13 is connected to the annular plate 10 through a disc spring 16, so that the connecting rope 8 is always in a taut state. When the hydraulic cylinder 6 pushes the bottom plate 4 away from the lifting plate 3 for tensile measurement, the wire winding wheel 14 is driven to rotate through the connecting rope 8, and then the rotating collar 11 is driven to rotate synchronously through the first gear 12, and the fasteners 15 are driven to tightly fix the beam-column, realizing automatic fixation of the measurement position of the beam-column, without manual operation for positioning, with a compact structure and high automation degree;

[0034] The fastener 15 includes an arc-shaped plate 18, a spring 19, a connecting block 20 and a wedge-shaped block 21. The arc-shaped plate 18 is connected to the inner wall of the fixed cylinder 9 through the spring 19. The connecting block 20 passes through and is slidably connected to the fixed cylinder 9 and is fixed to the arc-shaped plate 18. The wedge-shaped block 21 is fixed to the inner ring side wall of the rotating collar 11, and a slope matching the wedge-shaped block 21 is provided on the connecting block 20. During the measurement work, the fixed cylinder 9 is sleeved on the beam-column. Through the rotation of the rotating collar 11, the wedge-shaped block 21 pushes the connecting block 20 to approach the beam-column. Each arc-shaped plate 18 synchronously approaches the beam-column and tightly fixes it, so that the center line of the beam-column coincides with the axis of the fixed cylinder 9, and the position of the beam-column of the laminated bamboo structure can be fixed and positioned, avoiding problems such as concentrated stress and eccentric force, and ensuring the accuracy of the measurement result.

[0035] A stepper component 17 for adjusting the height of the lifting plate 3 is provided on the test stand 2. The stepper component 17 is connected to the rotating collar 11. By rotating the rotating collar 11, the lifting plate 3 is intermittently lifted upward, achieving the purpose of adjusting the measurement position. The stepper component 17 includes racks 24 fixed on both side walls of the test stand 2. The lifting plate 3 is provided with a driving shaft 25. Second gears 26 are fixed at both ends of the driving shaft 25. The second gears 26 mesh with the racks 24. A rotating seat 27 is fixed on the upper surface of the lifting plate 3. The driving shaft 25 is rotatably connected to the rotating seat 27. The stepper component 17 further includes a worm 28 rotatably connected through the lifting plate 3. A third gear 30 is fixed at the lower end of the worm 28 through a one-way bearing 29. The third gear 30 meshes with the rotating collar 11. A worm gear 31 is fixed on the driving shaft 25. The worm gear 31 meshes with the worm 28;

[0036] During operation, with the rotating collar 11 as the driving force, the lifting plate 3 intermittently moves upward a certain distance during the measurement process. Thus, the tensile strength of different regions of a relatively long glued laminated bamboo structure beam-column can be measured in a segmented manner, obtaining more detailed and specific strength measurement results. And there is no need to set up an additional power driving device, enabling the tensile strength measurement work and the adjustment of the measurement position to be linked and coordinated, which is beneficial to improving the measurement efficiency.

[0037] The working principle of the present invention is as follows:

[0038] The glued laminated bamboo structure beam-column to be measured is passed through two fixed cylinders 9 and vertically placed on the base 1. The hydraulic cylinder 6 is started to extend through the console 35. The hydraulic cylinder 6 pushes the bottom plate 4 away from the lifting plate 3. When performing the tensile measurement, the wire winding wheel 14 is driven to rotate by the connecting rope 8. The wire winding wheel 14 drives the first gear 12 to rotate synchronously through the rotating shaft 13. Since the first gear 12 meshes with the tooth grooves on the rotating collar 11, the rotating collar 11 is driven to rotate synchronously through the first gear 12. The wedge-shaped block 21 pushes the connecting block 20 closer to the beam-column. Each arc-shaped plate 18 approaches the beam-column synchronously and presses and fixes it, making the center line of the beam-column coincide with the axis of the fixed cylinder 9. The position of the glued laminated bamboo structure beam-column can be fixed and positioned, avoiding problems such as concentrated stress and eccentric force, ensuring the accuracy of the measurement results, achieving automatic fixation of the measurement position of the beam-column without manual operation for positioning, having a compact structure and a high degree of automation. The stress data applied by the hydraulic cylinder 6 at this time is recorded by the pressure sensor 23;

[0039] After cracks appear in the beam-column of the regional reorganized bamboo structure in this section and the damage time is recorded, the tensile strength of this section is calculated based on the stress and damage time data. Then, the hydraulic cylinder 6 is controlled to contract, so that the bottom plate 4 and the lifting plate 3 approach each other. At this time, the disc spring 16 drives the rotating shaft 13 to rotate reversely and reset, and then drives the rotating collar 11 to rotate reversely and reset through the first gear 12. Then, the wedge block 21 is separated from the connecting block 20, and the arc plate 18 is separated from the surface of the beam-column under the elastic force of the spring 19. The rotating collar 11 drives the third gear 30 to rotate. In this direction, the one-way bearing 29 is locked, and then drives the worm 28 to rotate. Since the worm gear 31 meshes with the worm 28, the second gear 26 is driven to rotate through the drive shaft 25. Since the second gear 26 meshes with the rack 24, the lifting plate 3 is moved upward by a certain distance, so that the two groups of positioning components 7 move to the next section area to be measured of the beam-column. By repeating the above operations, the segmented tensile strength measurement of different areas of the longer reorganized bamboo structure beam-column can be realized, so as to obtain more detailed and specific strength measurement results, and there is no need to set up an additional power driving device, so that the tensile strength measurement work and the adjustment of the measurement position are linked and coordinated, which is beneficial to the improvement of the measurement efficiency.

[0040] For those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An apparatus for measuring the long-term tensile strength of a recombinant bamboo structural beam-column, comprising a base (1), characterized in that, A test stand (2) is fixed on the base (1). A lifting plate (3) is slidably connected to the test stand (2). A bottom plate (4) parallel to the lifting plate (3) is arranged below the lifting plate (3). Through holes (5) for the beam-column to pass through are formed in the middle of the lifting plate (3) and the bottom plate (4). The lifting plate (3) and the bottom plate (4) are connected by a hydraulic cylinder (6). Two sets of symmetrically arranged positioning components (7) are arranged between the lifting plate (3) and the bottom plate (4). A connecting rope (8) is connected between the two sets of positioning components (7). The two sets of positioning components (7) are respectively connected to the lifting plate (3) and the bottom plate (4). The positioning component (7) includes a fixed cylinder (9), an annular plate (10), a rotating collar (11), a first gear (12), a rotating shaft (13), a winding wheel (14) and a plurality of fasteners (15). The fixed cylinder (9) is fixedly connected to the lifting plate (3). The annular plate (10) is fixedly connected to the end of the fixed cylinder (9). The rotating collar (11) is rotatably connected to the annular plate (10). The rotating shaft (13) is rotatably connected through the annular plate (10). The first gear (12) and the winding wheel (14) are respectively fixed to the upper end and the lower end of the rotating shaft (13). Tooth grooves are arranged on the outer peripheral side wall of the rotating collar (11), and the tooth grooves are meshed with the first gear (12). A plurality of the fasteners (15) are arranged in an annular array on the fixed cylinder (9). Both ends of the connecting rope (8) are respectively wound around the winding wheels (14) in the two sets of positioning components (7). The rotating shaft (13) is connected to the annular plate (10) through a disc spring (16), so that the connecting rope (8) is always in a taut state. A stepping component (17) for adjusting the height of the lifting plate (3) is arranged on the test stand (2). The stepping component (17) is connected to the rotating collar (11). By rotating the rotating collar (11), the lifting plate (3) intermittently moves upward to achieve the purpose of adjusting the measurement position.

2. The measuring device for the long-term tensile strength of a recombinant bamboo structure beam-column according to claim 1, wherein: The fastener (15) includes an arc-shaped plate (18), a spring (19), a connecting block (20) and a wedge-shaped block (21). The arc-shaped plate (18) is connected to the inner wall of the fixed cylinder (9) through a spring (19). The connecting block (20) is slidably connected through the fixed cylinder (9) and is fixed to the arc-shaped plate (18). The wedge-shaped block (21) is fixed to the inner ring side wall of the rotating collar (11), and an inclined surface matching the wedge-shaped block (21) is arranged on the connecting block (20).

3. The measuring device for the long-term tensile strength of a recombinant bamboo structural beam-column according to claim 1, characterized in that: A fixed pulley (22) is fixed on the annular plate (10). The connecting rope (8) is arranged bypassing the fixed pulley (22).

4. The measuring device for the long-term tensile strength of a recombinant bamboo structure beam-column according to claim 1, characterized in that: A pressure sensor (23) is installed at the output end of the hydraulic cylinder (6) at the bottom of the lifting plate (3).

5. The measuring device for the long-term tensile strength of a recombinant bamboo structure beam-column according to claim 1, wherein: The stepping component (17) includes racks (24) fixed on both side walls of the test stand (2). The lifting plate (3) is provided with a driving shaft (25). Second gears (26) are fixed at both ends of the driving shaft (25). The second gears (26) are meshed with the racks (24).

6. The measuring device for the long-term tensile strength of a recombinant bamboo structural beam-column according to claim 5, characterized in that: A rotating seat (27) is fixed on the upper surface of the lifting plate (3), and the driving shaft (25) is rotatably connected to the rotating seat (27).

7. The measuring device for the long-term tensile strength of a recombinant bamboo structure beam-column according to claim 5, characterized in that: The stepping component (17) further includes a worm (28) penetrating and rotatably connected to the lifting plate (3). A third gear (30) is fixed to the lower end of the worm (28) through a one-way bearing (29). The third gear (30) meshes with the rotating collar (11). A worm gear (31) is fixed on the driving shaft (25), and the worm gear (31) meshes with the worm (28).

8. The measuring device for the long-term tensile strength of a recombinant bamboo structural beam-column according to claim 4, characterized in that: A control console (35) is arranged on the base (1), and the hydraulic cylinder (6) and the pressure sensor (23) are both electrically connected to the control console (35).

9. The measuring device for the long-term tensile strength of a recombinant bamboo structure beam-column according to claim 1, wherein: A ratchet tooth (32) is arranged on the side wall of the test stand (2), and a toothed plate (34) matching the ratchet tooth (32) is connected to the lifting plate (3) through a compression spring (33).

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