Bending Stiffness Test Device for Building Paper Honeycomb Composite Wallboard

Abstract

The present invention belongs to the technical field of product testing, and particularly relates to a bending stiffness test device for a building paper honeycomb composite wallboard. The present invention uses a plurality of electric control telescopic rods and a PLC controller to achieve automatic detection, greatly improving the accuracy and efficiency of the test, eliminating the interference of human factors, realizing the automation of the test, and the present invention uses a positioning plate and a horizontal support plate to accurately position the specimen, ensuring the accuracy of the operation and the quality of the test. The specimen is supported by a rotating support rod and a non-rotating support rod, so that the deformation of the specimen is not restricted during the test, and the obtained test results are more accurate.

Description

Technical Field

[0001] The present invention belongs to the technical field of product testing, and particularly relates to a bending stiffness test device for a building paper honeycomb composite wallboard. Background Art

[0002] The building paper honeycomb composite wallboard is a new type of wall material, which is made by bonding and pressing a fireproof board and a honeycomb paper core for indoor wallboards. Its outstanding advantages are energy conservation, light weight, and good wallboard structure. It can save construction time during construction such as laying wires and pre-burying pipes in the wallboard and painting the outer surface of the wallboard. The outer surface of this kind of wallboard is flat and does not crack, and its thickness is smaller than that of conventional wallboards such as clay bricks, hollow bricks, and aerated blocks, which can save the effective use area. This wallboard also has outstanding moisture-proof, sound-insulating, fire-proof, and environmental protection characteristics, and is one of the key indoor wall materials selected for high-rise buildings in recent years. Many advantages of this wallboard can only be realized on the premise of ensuring quality performance, among which the bending stiffness performance of this wallboard is one of the important quality indicators. The current test process for the bending stiffness performance of this wallboard is as follows: Take 5 specimens with a length of 900 mm × a width of 150 mm from the paper honeycomb composite wallboard, measure and mark the center line on each specimen, apply a certain force value to the middle of each specimen on the testing machine, use a displacement dial indicator to measure the deformation values of the specimens warping at a specified distance on both sides, take the average value of the left and right sides and substitute it into the stiffness calculation formula to obtain the bending stiffness of 1 specimen. After such tests on 5 specimens, take the arithmetic average of the bending stiffness of the 5 specimens as the final test result. During the test process, since it is manually measured, marked, and placed in the testing machine one by one, and then the marking on the specimen is manually aligned with the center line of the testing machine indenter for alignment, the loading is manually controlled, the data of the displacement dial indicator is measured and read, and the bending stiffness of 1 specimen is calculated by substituting it into the formula. In this way, the bending stiffness of 5 specimens is obtained, and then the arithmetic average of the bending stiffness of these 5 specimens is calculated as the bending stiffness test result of this batch of samples. During the test process, since many steps are manually operated and measured, it is inevitable to have human interference factors, which will inevitably affect the test results and lead to low test quality and efficiency. At present, there is no automatic test device and method that can eliminate human interference factors. Summary of the Invention

[0003] The problem to be solved by the present invention is to overcome the deficiencies of the background art and provide a bending stiffness test device for a building paper honeycomb composite wallboard.

[0004] The present invention is realized through the following technical solutions:

[0005] A bending stiffness test device for a building paper honeycomb composite wallboard, comprising a rotating support rod and a non-rotating support rod that are parallel. Both ends of the rotating support rod and the non-rotating support rod are fixed on a bracket. The upper surfaces of the rotating support rod and the non-rotating support rod are on the same horizontal plane. The rotating support rod can rotate relative to the bracket, and the non-rotating support rod cannot rotate relative to the bracket. It also includes a positioning plate and a horizontal support plate located outside the rotating support rod and the non-rotating support rod. A plurality of positioning grooves A are evenly arranged on the right side surface of the positioning plate. The left side surface of the positioning plate is fixed at the end of the horizontal telescopic rod C of an electric control telescopic rod C, and the electric control telescopic rod C is fixed on a bench. The positioning groove A is a horizontal groove, and the bottom of the positioning groove A matches the specimen. The upper surface of the horizontal support plate is evenly provided with positioning grooves B corresponding to the positioning grooves A. The bottom of the horizontal support plate is fixed at the upper end of the vertical telescopic rod B of an electric control telescopic rod B. The positioning groove B is a vertical groove, and the bottom of the positioning groove B matches the specimen. It also includes a frame, which includes two columns and a cross beam connecting the columns. The cross beam is perpendicular to the specimen and is located above the middle position of the specimen. On both sides of the inner sides of the two columns, a servo motor D is respectively fixed. A coupling is installed on the motor shaft D of the servo motor D. A lead screw is installed upward on the coupling. A nut is screwed on the lead screw. A bearing is installed at the top of the lead screw, and the bearing is embedded in the bottom surface of the cross beam. A horizontal beam is connected between the two nuts. A plurality of electric control telescopic rods A are fixed downward on the bottom surface of the horizontal beam corresponding to the middle position of the specimen. The end of the telescopic rod A of the electric control telescopic rod A is installed with a pressure sensor. A vertical connecting rod is installed below the pressure sensor, and a pressing rod is welded at the lower end of the connecting rod. It also includes a laser displacement sensor. The laser displacement sensor is located below the specimen, and laser displacement sensors are symmetrically installed on the left and right for each specimen. The power sources of the electric control telescopic rod C, the electric control telescopic rod B, and the electric control telescopic rod A are respectively a servo motor C, a servo motor B, and a servo motor A. The servo motor C, the servo motor B, the servo motor A, the servo motor D, the laser displacement sensor, and the pressure sensor are all connected to a PLC controller through control wires.

[0006] Preferably, the horizontal cross-section of the positioning groove A is an isosceles trapezoid, and the vertical cross-section of the positioning groove B is an isosceles trapezoid.

[0007] Preferably, the structure for the rotating support rod to rotate relative to the bracket is: the rotating support rod includes a support rod shaft and a sleeve sleeved on the support rod shaft. The sleeve can rotate around the support rod shaft, and the support rod shaft is fixed on the bracket.

[0008] Preferably, the structure for the rotating support rod to rotate relative to the bracket is: rolling bearings are installed at both ends of the rotating support rod, the rolling bearings are fixed on the bracket, and the rotating support rod can rotate within the rolling bearings.

[0009] Preferably, an arched reinforcing rib is welded on the top of the horizontal beam.

[0010] Preferably, reinforcing ribs are provided at the bottom of the columns.

[0011] Furthermore, the distances from the rotating support rod and the non-rotating support rod to the center of the pressure rod are both 200 mm.

[0012] Furthermore, the distance from the laser displacement sensor to the center of the pressure rod is 400 mm.

[0013] Furthermore, a short horizontal rod is fixed in the middle of the cross beam, and a monitoring camera is installed at the end of the short horizontal rod. The monitoring camera is connected to the PLC controller.

[0014] The device of the present invention automatically conducts the bending stiffness test of the paper honeycomb composite wallboard, greatly improving the accuracy and efficiency of the test, eliminating the interference of human factors, and realizing the automation of the test. The present invention uses an isosceles trapezoid structure for the vertical positioning plate and the horizontal support plate in contact with the specimen to conveniently position the specimen, ensuring the accuracy of the operation and the test quality. The rotating support rod and the non-rotating support rod are used to support the specimen, so that the deformation of the specimen is not restricted during the test, and the obtained test results are more accurate. Description of the Drawings

[0015] Figure 1 is the front view of the present invention.

[0016] Figure 2 is Figure 1 the top view of

[0017] Figure 3 is Figure 1 the side view of

[0018] Figure 4 is Figure 1 the A-A sectional view of

[0019] Figure 5 is Figure 2 the enlarged view of part I of

[0020] Figure 6 Figure 1 The position state diagram of relevant components after applying force in

[0021] In the figure, 1 is the column, 4 is the bracket, 6 is the laser displacement sensor, 7 is the laser beam, 8 is the ground, 9 is the bench, 11 is the electric control telescopic rod C, 12 is the servo motor C, 13 is the PLC controller, 14 is the telescopic rod C, 16 is the positioning plate, 17 is the specimen, 18 is the non-rotating support rod, 19 is the servo motor D, 21 is the monitoring camera, 22 is the short horizontal rod, 23 is the cross beam, 24 is the rotating support rod, 25 is the horizontal support plate, 26 is the telescopic rod B, 27 is the electric control telescopic rod B, 28 is the servo motor B, 29 is the lead screw, 30 is the pressure rod, 31 is the connecting rod, 32 is the pressure sensor, 33 is the telescopic rod A, 34 is the electric control telescopic rod A, 35 is the servo motor A, 36 is the nut, 38 is the horizontal beam, 39 is the arched reinforcing rib, 40 is the positioning groove A, 41 is the positioning groove B, 42 is the motor shaft D. Specific Embodiments

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without making creative efforts fall within the protection scope of the present invention. In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "inner", "outer", "upper", "lower", "front", "rear", etc. is based on the positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0023] Through the attached Figure 1 to the attached Figure 6 The embodiments of the present invention will be introduced in detail. The device of the present invention includes a frame, and the frame includes two parallel columns 1. The tops of the two columns 1 are connected by a crossbeam 23. Reinforcing ribs are provided at the bottoms of the columns 1, and the columns 1 are fixed to the ground 8 by anchor bolts. On the inner sides of the two columns 1 near the ground 8 of the columns 1, a servo motor D19 is fixed by anchor bolts respectively. A coupling is installed on the motor shaft D42 of the servo motor D19, and a vertical lead screw 29 is installed at the upper end of the coupling. A nut 36 is screwed on the lead screw 29, and a bearing is installed at the top of the lead screw 29, and the bearing is embedded in the bottom surface of the crossbeam 23. The two nuts 36 on the lead screw 29 are at the same height, and the two nuts 36 are connected by a horizontal beam 38. An arched reinforcing rib 39 is welded on the top of the horizontal beam 38, and the arch of the arched reinforcing rib 39 can increase the strength. A number of electro-controlled telescopic rods A34 that apply force vertically downward are evenly fixed on the bottom surface of the horizontal beam 38 by bolts. In this embodiment, there are 5 specimens 17, so 5 electro-controlled telescopic rods A34 are provided, and the servo motor A35 is the power source of the electro-controlled telescopic rods A34. A pressure sensor 32 is installed at the end of the telescopic rod A33 of the electro-controlled telescopic rod A34. A vertical connecting rod 31 is installed at the lower end of the pressure sensor 32, and a pressing rod 30 is welded at the lower end of the connecting rod 31. The pressing rod 30 is cylindrical, the diameter of the pressing rod 30 is slightly longer than the width of the specimen 17, and the center of the pressing rod 30 is directly opposite to the middle position of the specimen 17.

[0024] In this embodiment, the specimen 17 used has a width of 150 mm and a length of 900 mm. Taking the center of the pressure bar 30 as the reference, rotating support bars 24 and non-rotating support bars 18 are provided at 200 mm on each side of the specimen 17 in the length direction, that is, the distances from the rotating support bar 24 and the non-rotating support bar 18 to the center of the pressure bar 30 are both 200 mm. The rotating support bar 24 and the non-rotating support bar 18 are parallel to each other and perpendicular to the specimen 17. The upper surfaces of the rotating support bar 24 and the non-rotating support bar 18 are on the same horizontal plane. The rotating support bar 24 and the non-rotating support bar 18 are cylindrical support bars with the same dimensions. Both ends of the rotating support bar 24 and the non-rotating support bar 18 are fixed on the bracket 4. Among them, the rotating support bar 24 can rotate relative to the bracket 4, and the non-rotating support bar 18 cannot rotate relative to the bracket 4. The non-rotating support bar 18 is fixed on the bracket 4 so that it cannot rotate relative to the bracket 4. For example, both ends of the non-rotating support bar 18 are fixed on the bracket 4 by bolts, or directly welded to the bracket 4. There are various structures for the rotating support bar 24 to be able to rotate relative to the bracket 4, and no special restrictions are imposed here. For example, the rotating support bar 24 includes a support bar shaft and a sleeve sleeved on the support bar shaft, and the sleeve can rotate around the support bar shaft, and the support bar shaft is fixed on the bracket 4; another example is that rolling bearings are installed at both ends of the rotating support bar 24, the rolling bearings are fixed on the bracket 4, and the rotating support bar 24 can rotate within the rolling bearings

[0025] A positioning plate 16 is provided at the left end of the specimen 17. The positioning plate 16 is parallel to the rotating support bar 24 and the non-rotating support bar 18. Five positioning grooves A40 are evenly distributed on the side of the positioning plate 16 facing the end of the specimen 17. The positioning grooves A40 are horizontal grooves, and the bottom of the positioning grooves A40 matches the specimen 17. Placing the specimen 17 horizontally in the positioning grooves A40 can realize the positioning of the specimen 17 in the length and width directions. The five positioning grooves A40 can evenly separate five horizontal specimens 17. Preferably, the horizontal cross-section of the positioning grooves A40 is an isosceles trapezoid, or can also be a rectangle, etc. Preferably, the isosceles trapezoid is convenient for automatically positioning the specimen 17, so that there is no resistance when the specimen 17 is stressed and warped and deformed. The left side of the positioning plate 16 is fixed to the end of the horizontal telescopic rod C14 of the electric control telescopic rod C11. The electric control telescopic rod C11 is fixed to the bench 9 by bolts. The servo motor C12 provides power for the electric control telescopic rod C11. The bench 9 is fixed to the ground 8 by anchor bolts

[0026] A horizontal support plate 25 is provided below and near the end on the right side of the specimen 17. The horizontal support plate 25 is also parallel to the rotating support rod 24 and the non-rotating support rod 18. Five positioning grooves B41 corresponding to the positioning grooves A40 are evenly provided on the upper surface of the horizontal support plate 25. The bottom of the positioning groove B41 matches the specimen 17. The five positioning grooves B41 evenly separate the five horizontal specimens 17. The positioning groove B41 is a vertical groove. Similarly, in this embodiment, the vertical section of the preferably positioning groove B41 is an isosceles trapezoid. The vertical section being an isosceles trapezoid facilitates the automatic positioning of the specimen 17 being placed, so that there is no resistance when the specimen 17 is stressed and warped and deformed. The horizontal support plate 25 is fixed to the top of the telescopic rod B26 of the electric control telescopic rod B27. The electric control telescopic rod B27 is fixed to the ground 8 through anchor bolts. The servo motor B28 provides power for the electric control telescopic rod B27.

[0027] The laser displacement sensor 6 is located below the specimen 17, and the laser displacement sensors 6 are symmetrically installed on the left and right for each specimen 17. The distances from the laser displacement sensors 6 on both the left and right sides to the center of the pressure rod 30 are both 400 mm. When a certain force value is applied to the middle part of the upper surface of the specimen 17 by the pressure rod 30, both sides of the specimen 17 will warp a certain distance. The laser displacement sensor 6 measures the changed distance value and transmits the measured data to the PLC controller 13 through electric wires. The PLC controller 13 calculates the bending stiffness of the specimen 17 based on the downward pressure value on the middle part of the specimen 17 by the pressure rod 30 and the displacement data of the left and right sides of the specimen 17 measured by the laser displacement sensor 6. The PLC controller 13 obtains the arithmetic mean of the bending stiffnesses of the 5 specimens 17, and this arithmetic mean is the test result of the bending stiffness of this batch of samples.

[0028] A short horizontal rod 22 is also provided in the middle of the frame crossbeam 23. A monitoring camera 21 is installed at the end of the short horizontal rod 22. The monitoring camera 21 transmits the image data of the inspection process to the PLC controller 13 in real time. The PLC controller 13 analyzes and stores these images as evidence for tracing back in case of objections.

[0029] The electric control wires of the above-mentioned monitoring camera 21, laser displacement sensor 6, five servo motors A35, servo motor B28, servo motor C12, two servo motors D19, and five pressure sensors 32 are all connected to the PLC controller 13.

[0030] Usage method of the device: Place 5 specimens 17 on the non-rotating support rod 18 and the rotating support rod 24 respectively. At the same time, place the left end face of each specimen 17 in the positioning groove A40 of the positioning plate 16, and place the right end of the specimen 17 on the positioning groove B41 of the horizontal support plate 25. In this way, the specimens 17 are horizontally placed, evenly separated and parallel to each other. Press the test start button in the PLC controller 13, and each electric control component enters the working state. The PLC controller 13 controls the servo motor B28 to work so that the horizontal support plate 25 moves downward by a certain distance, controls the servo motor C12 to work so that the positioning plate 16 moves leftward by a certain distance, and controls the laser displacement sensor 6 to emit a laser beam 7. The distance data reached by each measured laser beam 7 is transmitted to the PLC controller 13. The PLC controller 13 controls the two servo motors D19 to work simultaneously. The lead screw 29 rotates, the nut 36 moves downward, the horizontal beam 38 connecting the two nuts 36 moves downward, and all the components fixed below the horizontal beam 38 also move downward synchronously. When the pressure rod 30 is about to contact the specimen 17, the two servo motors D19 stop working, and the 5 servo motors A35 work to make the 5 pressure rods 30 move downward and contact the middle parts of the specimens 17 below them respectively. When the pressure sensor 32 on a certain pressure rod 30 senses that the specified value is reached, the PLC controller 13 controls the servo motor A35 of the electric control telescopic rod A34 connected to this pressure sensor 32 to stop working. At the same time, the laser displacement sensors 6 on both sides below the specimen 17 transmit the measured displacement data of both ends of the specimen 17 after being stressed to the PLC controller 13. The PLC controller 13 calculates the flexural rigidity of this specimen 17 according to the displacement values of the specimen 17 before and after being stressed. Applying force, measuring and calculating for the 5 specimens 17 are all the same control procedures as above. The PLC controller 13 calculates the arithmetic mean according to the flexural rigidities of the 5 specimens 17 as the test result of the flexural rigidity of this sample. After the PLC controller 13 obtains the test result, each electric control component automatically returns to its original position and waits for the next batch of tests.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the above embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of each embodiment of the present invention.

Claims

1. An experimental device for the flexural stiffness of a building paper honeycomb composite wall panel, comprising parallel rotating support rods (24) and non-rotating support rods (18). Both ends of the rotating support rods (24) and the non-rotating support rods (18) are fixed on a bracket (4). The upper surfaces of the rotating support rods (24) and the non-rotating support rods (18) are on the same horizontal plane. The rotating support rods (24) can rotate relative to the bracket (4), and the non-rotating support rods (18) cannot rotate relative to the bracket (4). It is characterized in that: It also includes a positioning plate (16) and a horizontal support plate (25) located outside the rotating support rod (24) and the non-rotating support rod (18). A number of positioning grooves A (40) are evenly provided on the right side surface of the positioning plate (16). The left side surface of the positioning plate (16) is fixed to the end of the horizontal expansion rod C (14) of an electric control expansion rod C (11), and the electric control expansion rod C (11) is fixed on the bench (9); the positioning groove A (40) is a horizontal groove, and the bottom of the positioning groove A (40) matches the specimen (17); on the upper surface of the horizontal support plate (25), positioning grooves B (41) corresponding to the positioning grooves A (40) are evenly provided. The bottom of the horizontal support plate (25) is fixed to the upper end of the vertical expansion rod B (26) of an electric control expansion rod B (27); the positioning groove B (41) is a vertical groove, and the bottom of the positioning groove B (41) matches the specimen (17); it also includes a frame, the frame includes two columns (1) and a cross beam (23) connecting the columns (1). The cross beam (23) is perpendicular to the specimen (17) and is located above the middle position of the specimen (17). On both inner sides of the two columns (1), servo motors D (19) are respectively fixed. A coupling is installed on the motor shaft D (42) of the servo motor D (19). A lead screw (29) is installed upward on the coupling. A nut (36) is screwed on the lead screw (29). A bearing is installed at the top of the lead screw (29), and the bearing is embedded in the bottom surface of the cross beam (23). A horizontal beam (38) is connected between the two nuts (36). A number of electric control expansion rods A (34) are fixed downward on the bottom surface of the horizontal beam (38) corresponding to the middle position of the specimen (17). A pressure sensor (32) is installed at the end of the expansion rod A (33) of the electric control expansion rod A (34). A vertical connecting rod (31) is installed below the pressure sensor (32), and a pressing rod (30) is welded at the lower end of the connecting rod (31); it also includes a laser displacement sensor (6). The laser displacement sensor (6) is located below the specimen (17), and the laser displacement sensors (6) are symmetrically installed on the left and right for each specimen (17); the power sources of the electric control expansion rod C (11), the electric control expansion rod B (27), and the electric control expansion rod A (34) are respectively a servo motor C (12), a servo motor B (28), and a servo motor A (35). The servo motor C (12), the servo motor B (28), the servo motor A (35), the servo motor D (19), the laser displacement sensor (6), and the pressure sensor (32) are all connected to a PLC controller (13) through control wires; the horizontal cross-section of the positioning groove A (40) is an isosceles trapezoid, and the vertical cross-section of the positioning groove B (41) is an isosceles trapezoid; the distances from the rotating support rod (24) and the non-rotating support rod (18) to the center of the pressing rod (30) are both 200 mm; a short horizontal rod (22) is fixed in the middle of the cross beam (23), and a monitoring camera (21) is installed at the end of the short horizontal rod (22). The monitoring camera (21) is connected to the PLC controller (13).

2. The bending stiffness test device for the building paper honeycomb composite wallboard according to claim 1, characterized in that: The structure for the rotating support rod (24) to rotate relative to the bracket (4) is as follows: The rotating support rod (24) includes a support rod shaft and a sleeve sleeved on the support rod shaft. The sleeve can rotate around the support rod shaft, and the support rod shaft is fixed on the bracket (4).

3. The bending stiffness test device for the building paper honeycomb composite wallboard according to claim 1, wherein: The structure for the rotating support rod (24) to rotate relative to the bracket (4) is as follows: Rolling bearings are installed at both ends of the rotating support rod (24). The rolling bearings are fixed on the bracket (4), and the rotating support rod (24) can rotate within the rolling bearings.

4. The bending stiffness test device for the building paper honeycomb composite wallboard according to claim 1, wherein: An arched reinforcing rib (39) is welded to the top of the horizontal beam (38).

5. The bending stiffness test device for the building paper honeycomb composite wallboard according to claim 1, characterized in that: The distance from the laser displacement sensor (6) to the center of the pressure rod (30) is 400 mm.

6. The bending stiffness test device for the building paper honeycomb composite wallboard according to claim 1, wherein: Reinforcing ribs are provided at the bottom of the column (1).

Images