Strength testing device and method for wood composite board

Abstract

The invention relates to the technical field of wood strength detection, in particular to a strength testing device for a wood composite board and a detection method.The strength testing device comprises a base table and a driving base fixed to the base table, and is characterized by further comprising symmetrical supporting mechanisms; a driving mechanism is arranged in the driving base so as to drive the two sets of supporting frames to be close to or away from each other. A centering roller and first pressure sensor cooperation mechanism of the transverse centering mechanism is adopted, a roller driving mechanism is combined to drive a driving roller to rotate, a plate is driven to transversely move through friction force, two sets of first pressure sensors detect the pressure bearing value of the roller in real time, and rotation is stopped when the numerical values on the two sides are equal; the transverse center of the plate is aligned with the axis of the driving roller, and personal errors are eliminated.

Description

Technical Field

[0001] The present invention relates to the technical field of wood strength detection, and particularly to a strength testing device and method for wood composite boards. Background Art

[0002] The core purpose of pressure testing of wood is to verify the mechanical property limits of the boards, including key parameters such as flexural strength, elastic modulus, and failure load. In the current strength testing process of wood composite boards, it generally relies on manual placement and calibration. The operator needs to manually adjust the position of the board to align its center with the pressing device, but there is a risk of subjective error in manual visual positioning, which easily leads to deviation of test data; although existing automated testing equipment adopts an end clamping centering mechanism, it cannot effectively position long-sized boards that exceed the clamping distance.

[0003] CN202420451622.5 discloses a wood strength detection device, including a bottom plate, a support plate is arranged above the bottom plate, two groups of sliding grooves are opened on the upper surface of the support plate, a first bearing is fixedly embedded on one side of each of the two groups of sliding grooves close to each other, a second bearing is fixedly embedded on one side of each of the two groups of sliding grooves away from each other, the inner ring of each first bearing is fixedly connected with a threaded rod, and one end of each of the two threaded rods away from each other penetrates through the second bearing and extends to the outside of the support plate, and a threaded cylinder is threadedly connected to the outer surface of each threaded rod.

[0004] When the above device is in use, it cannot effectively position long-sized boards that exceed the clamping distance, thus unable to solve the problems raised above. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a strength testing device and method for wood composite boards to solve the problems of poor positioning efficiency in wood strength detection and difficulty in positioning long-sized boards that exceed the clamping distance.

[0006] Based on the above purpose, the present invention provides a strength testing device for wood composite boards, including a base platform and a driving base fixed thereon, characterized by further comprising:

[0007] Symmetrical support mechanism: Two groups of support frames are movably arranged on the driving base, and a driving mechanism is built in the driving base to drive the two groups of support frames to move closer to or away from each other;

[0008] Lateral centering mechanism: Two groups of centering mechanisms are respectively fixed on both sides of the two groups of support frames, and each centering mechanism includes:

[0009] An electric push rod slidably mounted on the driving base;

[0010] A first pressure sensor fixed on the top of the electric push rod;

[0011] The centering roller set on the top of the first pressure sensor;

[0012] Pressurization test mechanism:

[0013] The column vertically fixed to one side of the base;

[0014] The hydraulic actuator installed on the top of the column;

[0015] The second pressure sensor connected to the output end of the hydraulic actuator;

[0016] The pressing unit fixedly connected to the bottom of the second pressure sensor, and the pressing unit includes:

[0017] The second roller bracket connected to the second pressure sensor;

[0018] The driving main shaft rotatably installed between the second roller brackets;

[0019] The driving roller sleeved and fixed on the outer periphery of the driving main shaft;

[0020] The roller driving mechanism arranged on the second roller bracket to drive the driving main shaft to rotate.

[0021] Furthermore, the roller driving mechanism includes:

[0022] The driven gear ring fixed on the outer periphery of the driving main shaft;

[0023] The driving gear rotatably arranged on the inner side wall of the second roller bracket and meshing with the driven gear ring;

[0024] The driving motor installed on the outer side wall of the second roller bracket to drive the driving gear.

[0025] Furthermore, both axial ends of the driving main shaft respectively extend out of the second roller bracket, and longitudinal centering mechanisms are arranged at both ends.

[0026] Furthermore, the longitudinal centering mechanism includes:

[0027] The guiding auxiliary rod coaxially arranged at the end of the driving main shaft, and the guiding auxiliary rod is detachably connected to the driving main shaft through an electromagnetic clutch;

[0028] The second telescopic driver fixed on the outer side wall of the second roller bracket, and its output end is connected to the vertical plate;

[0029] The vertical plate is rotatably sleeved on the outer wall of the guiding auxiliary rod, and an adjusting screw is arranged at its bottom;

[0030] The adjusting component installed on the vertical plate to drive the adjusting screw to axially move.

[0031] Furthermore, the adjusting component includes:

[0032] Rotate the driving pulley and the driven pulley respectively provided at the upper end and the lower end of the vertical plate;

[0033] A synchronous belt sleeved between the driving pulley and the driven pulley;

[0034] A limiting block provided on the inner wall of the driving pulley, and a guiding chute axially opened on the surface of the guiding sub-rod for sliding cooperation with the limiting block;

[0035] The inner wall of the driven pulley is in threaded engagement with the adjusting screw;

[0036] Stop blocks fixed at both ends of the adjusting screw, and a stop rod connecting the two stop blocks, the stop rod is slidably engaged with the vertical plate.

[0037] Furthermore, the driving base includes:

[0038] A hollow matrix fixed on the base;

[0039] A bidirectional screw rotatably installed in the inner cavity of the matrix;

[0040] A servo motor provided at one end of the matrix for driving the bidirectional screw to rotate;

[0041] Two moving blocks screwed on the reverse threaded sections of the bidirectional screw;

[0042] Sliding holes opened on both side surfaces of the matrix, and sliders slidably arranged in the sliding holes and connected to the moving blocks.

[0043] Furthermore, the support frame includes:

[0044] A moving plate fixed on the slider;

[0045] A column vertically fixed on the outside of the moving plate;

[0046] A support shaft horizontally connecting the tops of the two columns.

[0047] Furthermore, both ends of the support shaft are respectively hinged with foldable side support rods, and both axial ends of the support shaft extend outwards through the columns.

[0048] Furthermore, it further includes:

[0049] A guiding sliding frame slidably sleeved on the column;

[0050] A connecting rod with both ends respectively hinged to the bottom of the side support rod and the guiding sliding frame;

[0051] A first telescopic driver fixed on the column, and its output end is connected to the guiding sliding frame for driving it to lift and lower.

[0052] A testing method for a strength testing device for wood composite boards, comprising the following steps:

[0053] S1. Initial positioning:

[0054] Extend the electric push rod of the lateral centering mechanism to lift the centering roller above the support shaft of the support frame.

[0055] Place the wood composite board to be measured horizontally on the two lateral centering rollers.

[0056] S2. Longitudinal centering and positioning:

[0057] Start the hydraulic actuator of the pressure testing mechanism to move downward, so that the stop blocks at both ends of the adjusting screw of the pressing unit are arranged on the front and back sides of the board.

[0058] Control the electromagnetic clutch to be energized to connect the driving main shaft and the guiding auxiliary rod.

[0059] Start the roller driving mechanism to drive the driving main shaft to rotate, and drive the synchronous belt to move through the guiding auxiliary rod.

[0060] Drive the adjusting screw to rotate, so that the two stop blocks move towards each other along the stop rod to clamp both sides of the board. After clamping, drive the driving main shaft to rotate in the reverse direction to reset the clamping stop blocks.

[0061] The electromagnetic clutch is de-energized to separate the driving main shaft and the guiding auxiliary rod.

[0062] S3. Lateral centering and positioning:

[0063] Keep the hydraulic actuator in the downward pressing state so that the driving roller contacts the upper surface of the board.

[0064] Start the roller driving mechanism to drive the driving roller to rotate and drive the board to move horizontally.

[0065] Compare the values of the two groups of first pressure sensors in real time, and stop rotating when the values on both sides are equal.

[0066] S4. Support adjustment and pressure testing:

[0067] Shrink the electric push rod to lower the board to the support shaft.

[0068] Start the first telescopic driver to lift the guiding carriage.

[0069] Control the hydraulic actuator to pressurize to the set value and record the test data through the second pressure sensor.

[0070] The beneficial effects of the present invention: By adopting the cooperation mechanism of the centering roller of the lateral centering mechanism and the first pressure sensor, combined with the roller driving mechanism to drive the driving roller to rotate, the board is driven to move horizontally through the frictional force. The two groups of first pressure sensors detect the bearing pressure value of the roller in real time. When the values on both sides are equal, the rotation stops, realizing the alignment of the horizontal center of the board with the axis of the driving roller, eliminating human errors, and having no size limit, and being able to position long-sized boards. Brief Description of the Drawings

[0071] The disclosure of the present invention will be described with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of the present invention. In the drawings, the same reference numerals are used to refer to the same components. Among them:

[0072] Figure 1 is a schematic structural diagram of the first perspective of an embodiment of the present invention;

[0073] Figure 2 is a schematic structural diagram of the first perspective of the pressing unit of an embodiment of the present invention;

[0074] Figure 3 is of an embodiment of the present invention Figure 2 an enlarged structural diagram of A therein;

[0075] Figure 4 is a schematic structural diagram of the second perspective of the pressing unit of an embodiment of the present invention;

[0076] Figure 5 is a schematic structural diagram of the installation structure of the support frame of an embodiment of the present invention;

[0077] Figure 6 is a schematic structural diagram of the internal structure of the drive base of an embodiment of the present invention;

[0078] Figure 7 is a schematic front view structural diagram of the support frame of an embodiment of the present invention.

[0079] The markings in the figure are:

[0080] 1, base; 2, drive base; 21, base body; 211, sliding hole; 212, slider; 22, bidirectional screw; 23, servo motor; 24, moving block; 3, support frame; 31, moving plate; 32, column; 33, support shaft; 34, side support rod; 35, guiding sliding frame; 36, connecting rod; 37, first telescopic driver; 4, centering mechanism; 41, sliding seat; 42, electric push rod; 43, first pressure sensor; 44, centering roller; 441, first roller bracket; 442, first adjusting roller; 5, side column; 6, hydraulic actuator; 61, second pressure sensor; 7, pressing unit; 71, second roller bracket; 72, driving main shaft; 721, electromagnetic clutch; 73, driving roller; 74, roller driving mechanism; 741, driving motor; 742, driving gear; 743, driven toothed ring; 75, second telescopic driver; 76, vertical plate; 761, driving pulley; 762, driven pulley; 763, synchronous belt; 77, guiding auxiliary rod; 771, guiding chute; 78, adjusting screw; 781, stop block; 782, stop rod. Detailed Description of the Invention

[0081] It is easy to understand that according to the technical solution of the present invention, without changing the essential spirit of the present invention, a person skilled in the art can propose a variety of interchangeable structural modes and implementation modes. Therefore, the following specific embodiments and drawings are only exemplary descriptions of the technical solution of the present invention and should not be regarded as the entire invention or as a limitation or restriction of the technical solution of the present invention.

[0082] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 As shown, a strength testing device for wood composite panels includes a base 1 and a driving base 2 fixed thereon, and is characterized in that it also includes:

[0083] Symmetrical support mechanism: two sets of support frames 3 are movably arranged on the driving base 2, and the driving base 2 has a built-in driving mechanism to drive the two sets of support frames 3 to move closer or farther away from each other;

[0084] Horizontal centering mechanism: Two sets of centering mechanisms 4 are fixed on both sides of the two sets of support frames 3, and each centering mechanism 4 includes:

[0085] An electric push rod 42 slidably mounted on the driving base 2;

[0086] A first pressure sensor 43 fixed to the top of the electric push rod 42;

[0087] A centering roller 44 is provided on top of the first pressure sensor 43; the centering roller 44 includes a first roller bracket 441 fixed to the top of the first pressure sensor 43, and a first adjusting roller 442 rotates between the first roller bracket 441;

[0088] Pressure testing organization:

[0089] A column 32 fixed vertically to one side of the base 1;

[0090] A hydraulic actuator 6 mounted on top of the column 32;

[0091] A second pressure sensor 61 connected to the output end of the hydraulic actuator 6;

[0092] The pressing unit 7 is fixed to the bottom of the second pressure sensor 61, and the pressing unit 7 includes:

[0093] A second roller bracket 71 connected to the second pressure sensor 61;

[0094] Rotate the drive spindle 72 mounted between the second roller brackets 71;

[0095] A driving roller 73 is sleeved and fixed on the outer periphery of a driving main shaft 72, and a friction rubber pad is arranged on the outer periphery of the driving roller 73;

[0096] A roller driving mechanism 74 is arranged on the second roller bracket 71 to drive the driving main shaft 72 to rotate.

[0097] In this embodiment, in the initial state, the electric push rod 42 of the lateral centering mechanism is extended to push the first pressure sensor 43 and the centering roller 44 to lift, so that its height exceeds the support surface of the support frame 3; at this time, the wood composite board to be tested is horizontally placed on the two centering rollers 44 on both sides; the hydraulic actuator 6 of the pressurization test mechanism is started to drive the second pressure sensor 61 and the pressing unit 7 to move down as a whole, so that the driving roller 73 contacts the upper surface of the board; then the lateral centering is started: the roller driving mechanism 74 drives the driving roller 73 to rotate, and drives the board to move horizontally through friction. The two groups of first pressure sensors 43 detect the bearing pressure value of the roller in real time. When the values on both sides are equal, the rotation stops, and the horizontal center of the board is aligned with the axis of the driving roller 73; then the electric push rod 42 contracts to lower the board to the support shaft 33 of the support frame 3. Finally, the hydraulic actuator 6 pressurizes to the set value, and the driving roller 73 applies a vertical load to the board, and the second pressure sensor 61 continuously records the pressure data until the test is completed.

[0098] Preferably, the roller driving mechanism 74 includes:

[0099] A driven gear ring 743 fixed on the outer periphery of the driving main shaft 72;

[0100] A driving gear 742 rotatably arranged on the inner side wall of the second roller bracket 71 and meshing with the driven gear ring 743;

[0101] A driving motor 741 installed on the outer side wall of the second roller bracket 71 to drive the driving gear 742;

[0102] When it is necessary to drive the driving roller 73 to rotate, the driving motor 741 installed on the outer side wall of the second roller bracket 71 is started, and its output shaft drives the driving gear 742 to rotate; the driving gear 742 is rotatably arranged on the inner side wall of the second roller bracket 71 and forms a gear meshing transmission with the driven gear ring 743 fixed on the outer periphery of the driving main shaft 72, so as to transmit the torque to the driving main shaft 72 and drive the driving roller 73 sleeved and fixed thereon to rotate synchronously.

[0103] Preferably, both axial ends of the driving main shaft 72 extend out of the second roller bracket 71, and longitudinal centering mechanisms are arranged at both ends;

[0104] The longitudinal centering mechanism includes:

[0105] A guiding secondary rod 77 coaxially arranged at the end of the driving main shaft 72, and the guiding secondary rod 77 is detachably connected to the driving main shaft 72 through an electromagnetic clutch 721;

[0106] A second telescopic driver 75 fixed on the outer wall of the second roller bracket 71, and its output end is connected to a vertical plate 76;

[0107] The vertical plate 76 is rotatably sleeved on the outer wall of the guiding secondary rod 77, and an adjusting screw rod 78 is arranged at its bottom;

[0108] An adjusting assembly installed on the vertical plate 76 to drive the axial movement of the adjusting screw rod 78;

[0109] The adjusting assembly includes:

[0110] A driving pulley 761 and a driven pulley 762 respectively rotatably arranged at the upper end and the lower end of the vertical plate 76;

[0111] A synchronous belt 763 sleeved between the driving pulley 761 and the driven pulley 762;

[0112] A limiting block arranged on the inner wall of the driving pulley 761, and a guiding chute 771 axially opened on the surface of the guiding secondary rod 77 for sliding cooperation with the limiting block;

[0113] The inner wall of the driven pulley 762 is in threaded engagement with the adjusting screw rod 78;

[0114] Stop blocks 781 fixed at both ends of the adjusting screw rod 78, and a stop rod 782 connecting the two stop blocks 781, and the stop rod 782 is in sliding cooperation with the vertical plate 76.

[0115] When longitudinal positioning is required, the second telescopic driver 75 drives the entire vertical plate 76 to move downward, so that the stop blocks 781 at both ends of the adjusting screw rod 78 are respectively located on both sides in the width direction of the plate. At this time, the electromagnetic clutch 721 is energized and attracted to connect the power of the guiding secondary rod 77 and the driving main shaft 72. The roller driving mechanism 74 is started and drives the driving main shaft 72 to rotate, driving the guiding secondary rod 77 to rotate synchronously. The guiding chute 771 on its surface is in sliding cooperation with the limiting block on the inner wall of the driving pulley 761, forcing the driving pulley 761 to rotate accordingly. The driven pulley 762 is driven to rotate through the synchronous belt 763. Since the inner wall of the driven pulley 762 is in threaded engagement with the adjusting screw rod 78, the rotational motion is converted into the axial movement of the adjusting screw rod 78. At the same time, the stop blocks 781 at both ends of the adjusting screw rod 78 are restricted by the sliding cooperation between the stop rod 782 and the vertical plate 76, and move linearly towards each other along the stop rod 782 until the two ends of the plate are clamped. After longitudinal centering is completed, the roller driving mechanism 74 immediately reverses, driving the adjusting screw rod 78 to rotate back to reset the stop blocks 781, and the electromagnetic clutch 721 is de-energized to disconnect the power transmission.

[0116] Preferably, the driving base 2 includes:

[0117] A hollow base 21 fixed on the base 1;

[0118] Rotate the bidirectional screw 22 installed in the inner cavity of the base 21;

[0119] The servo motor 23 is provided at one end of the base 21 and is used to drive the bidirectional screw 22 to rotate;

[0120] Two moving blocks 24 screwed onto the opposite threaded sections of the bidirectional screw 22;

[0121] Sliding holes 211 are formed on both sides of the base 21, and sliding blocks 212 are slidably disposed in the sliding holes 211 and connected to the moving block 24;

[0122] The support frame 3 includes:

[0123] A movable plate 31 fixed to the slider 212, the movable plate 31 being connected to the sliding seat 41;

[0124] A column 32 fixed vertically to the outside of the movable plate 31;

[0125] A support shaft 33 horizontally connecting the tops of the two columns 32;

[0126] The two ends of the support shaft 33 are respectively hinged to the foldable side support rods 34, and the support shaft 33 extends outward from both ends to pass through the column 32;

[0127] Also includes:

[0128] A guide carriage 35 slidably mounted on the column 32;

[0129] A connecting rod 36 having two ends hinged to the bottom of the side support rod 34 and the guide slide 35;

[0130] The first telescopic driver 37 fixed to the column 32 has its output end connected to the guide slide 35 for driving the guide slide 35 to move up and down.

[0131] The servo motor 23 drives the bidirectional screw 22 to rotate in the hollow base 21, forcing the two moving blocks 24 screwed on its reverse threaded segments to move synchronously in opposite directions, driving the slider 212 fixed to the moving block 24 to slide along the sliding hole 211 on the side of the base 21, and then driving the moving plate 31 fixed on the slider 212 and the column 32 on its outer side to move closer or farther away, thereby realizing the width adjustment of the support frame 3; when the plate to be measured is in place, whether to use the side support rod 34 can be selected according to the width of the plate to be measured. When it is needed, the first telescopic drive 37 starts and pushes the guide slide 35 to rise along the column 32, and the side support rod 34 is pulled to expand around the hinge point of the support shaft 33 through the connecting rod 36 hinged at both ends to the bottom of the side support rod 34 and the guide slide 35, thereby expanding the support surface to adapt to plates of different widths.

[0132] A testing method for a strength testing device of a wood composite board, comprising the following steps:

[0133] S1. Initial positioning:

[0134] Control the electric push rod 42 of the lateral centering mechanism to extend, so that the centering roller 44 is lifted above the support shaft 33 of the support frame 3;

[0135] Horizontally place the wood composite board to be tested on the two lateral centering rollers 44;

[0136] S2. Longitudinal centering and positioning:

[0137] Start the hydraulic actuator 6 of the pressure testing mechanism to move downward, so that the stop blocks 781 at both ends of the adjusting screw 78 of the pressing unit 7 are arranged on the front and back sides of the board;

[0138] Control the electromagnetic clutch 721 to be energized to connect the driving main shaft 72 and the guiding auxiliary rod 77;

[0139] Start the roller driving mechanism 74 to drive the driving main shaft 72 to rotate, and drive the synchronous belt 763 to move through the guiding auxiliary rod 77;

[0140] Drive the adjusting screw 78 to rotate, so that the two stop blocks 781 move towards each other along the stop rod 782 to clamp both sides of the board, and after clamping, reversely drive the driving main shaft 72 to rotate to reset the stop blocks 781;

[0141] The electromagnetic clutch 721 is de-energized to separate the driving main shaft 72 and the guiding auxiliary rod 77;

[0142] S3. Lateral centering and positioning:

[0143] Keep the hydraulic actuator 6 in the downward pressing state, so that the driving roller 73 contacts the upper surface of the board;

[0144] Start the roller driving mechanism 74 to drive the driving roller 73 to rotate, and drive the board to move horizontally;

[0145] Compare the values of the two groups of first pressure sensors 43 in real time, and stop rotating when the values on both sides are equal;

[0146] S4. Support adjustment and pressure testing:

[0147] Contract the electric push rod 42 to lower the board to the support shaft 33;

[0148] Start the first telescopic driver 37 to lift the guiding carriage 35;

[0149] Control the hydraulic actuator 6 to pressurize to the set value, and record the test data through the second pressure sensor 61.

[0150] Working principle: In the initial state, the electric push rod 42 of the horizontal centering mechanism extends and lifts the centering roller 44 above the height of the support shaft 33. The operator horizontally places the wood composite board to be tested on the two centering rollers 44 on both sides. At this time, the hydraulic actuator 6 of the pressure testing mechanism drives the pressing unit 7 to move downward. The stop blocks 781 at both ends of the adjusting screw 78 are arranged on the front and rear sides of the board. At this time, the electromagnetic clutch 721 is energized to connect the driving main shaft 72 and the guiding auxiliary rod 77 in power. The roller driving mechanism 74 drives the driving gear 742 to engage with the driven toothed ring 743 to rotate through the driving motor 741. The driving main shaft 72 rotates and drives the synchronous belt 763 through the cooperation of the guiding chute 771 and the limiting block of the driving pulley 761, so that the adjusting screw 78 that is threadedly engaged with the driven pulley 762 moves axially, and the two stop blocks 781 slide towards each other along the stop rod 782 to clamp the longitudinal end face of the board. After the clamping is completed, the roller driving mechanism 74 reverses to reset the stop blocks 781, and the electromagnetic clutch 721 is de-energized and disengaged. Subsequently, the hydraulic actuator 6 drives the driving roller 73 to contact the upper surface of the board, and at the same time, the roller driving mechanism 74 drives the driving roller 73 to rotate, and drives the board to move horizontally by using the peripheral friction rubber pad, and compares the values of the two groups of first pressure sensors 43 in real time until they are equal to achieve horizontal centering. Then the electric push rod 42 contracts to lower the board to the support shaft 33. Finally, the hydraulic actuator 6 pressurizes to the set value, and the driving roller 73 applies a load to the board, and the second pressure sensor 61 continuously collects pressure data until the test ends.

[0151] The technical scope of the present invention is not limited to the content described in the above description. Those skilled in the art can make various deformations and modifications to the above embodiments without departing from the technical idea of the present invention, and these deformations and modifications should all fall within the protection scope of the present invention.

Claims

1. A strength testing device for a wood composite board, comprising a base table (1) and a driving base (2) fixed thereon, characterized in that, It further includes: Symmetrical support mechanism: Two groups of support frames (3) are movably arranged on the driving base (2), and a driving mechanism is built in the driving base (2) to drive the two groups of support frames (3) to approach or move away from each other relatively; Lateral centering mechanism: Two groups of centering mechanisms (4) are respectively fixed on both sides of the two groups of support frames (3), and each centering mechanism (4) includes: An electric push rod (42) slidably mounted on the driving base (2); A first pressure sensor (43) fixed on the top of the electric push rod (42); A centering roller (44) arranged on the top of the first pressure sensor (43); Pressurization test mechanism: A column (32) vertically fixed on one side of the base (1); A hydraulic actuator (6) installed on the top of the column (32); A second pressure sensor (61) connected to the output end of the hydraulic actuator (6); A pressing unit (7) fixedly connected to the bottom of the second pressure sensor (61), and the pressing unit (7) includes: A second roller bracket (71) connected to the second pressure sensor (61); A driving main shaft (72) rotatably installed between the second roller brackets (71); A driving roller (73) sleeved and fixed on the outer periphery of the driving main shaft (72); A roller driving mechanism (74) arranged on the second roller bracket (71) to drive the driving main shaft (72) to rotate.

2. The strength testing device for wood composite boards according to claim 1, characterized in that, The roller driving mechanism (74) includes: A driven gear ring (743) fixed on the outer periphery of the driving main shaft (72); A driving gear (742) rotatably arranged on the inner side wall of the second roller bracket (71) and meshing with the driven gear ring (743); A driving motor (741) installed on the outer side wall of the second roller bracket (71) to drive the driving gear (742).

3. The strength testing device for wood composite boards according to claim 1 or 2, characterized in that, Axial ends of the driving main shaft (72) respectively extend out of the second roller bracket (71), and longitudinal centering mechanisms are arranged at both ends.

4. The strength testing device for wood composite boards according to claim 3, characterized in that, The longitudinal centering mechanism includes: A guiding sub-rod (77) coaxially arranged at the end of the driving main shaft (72), and the guiding sub-rod (77) is detachably connected to the driving main shaft (72) through an electromagnetic clutch (721); A second telescopic driver (75) fixed on the outer side wall of the second roller bracket (71), and its output end is connected to a vertical plate (76); The vertical plate (76) is rotatably sleeved on the outer wall of the guiding sub-rod (77), and an adjusting screw rod (78) is arranged at its bottom; An adjusting component installed on the vertical plate (76) to drive the axial movement of the adjusting screw rod (78).

5. The strength testing device for wood composite boards according to claim 4, characterized in that, The adjusting component includes: A driving pulley (761) and a driven pulley (762) respectively rotatably arranged at the upper end and the lower end of the vertical plate (76); A synchronous belt (763) sleeved between the driving pulley (761) and the driven pulley (762); A limiting block arranged on the inner wall of the driving pulley (761), and a guiding chute (771) axially opened on the surface of the guiding sub-rod (77) for sliding cooperation with the limiting block; The inner wall of the driven pulley (762) is in threaded engagement with the adjusting screw rod (78); Stopping blocks (781) fixed at both ends of the adjusting screw rod (78), and a stopping rod (782) connecting the two stopping blocks (781), and the stopping rod (782) is in sliding cooperation with the vertical plate (76).

6. The strength testing device for wood composite boards according to claim 1, characterized in that, The driving base (2) includes: a hollow matrix (21) fixed on the base table (1); a bidirectional screw (22) rotatably installed in the inner cavity of the matrix (21); a servo motor (23) provided at one end of the matrix (21) for driving the bidirectional screw (22) to rotate; two moving blocks (24) screwed on the reverse threaded sections of the bidirectional screw (22); sliding holes (211) opened on both side surfaces of the matrix (21), and sliders (212) slidably arranged in the sliding holes (211) and connected to the moving blocks (24).

7. The strength testing device for wood composite boards according to claim 6, characterized in that, The support frame (3) includes: a moving plate (31) fixed on the slider (212); upright columns (32) vertically fixed on the outer side of the moving plate (31); a support shaft (33) horizontally connecting the tops of the two upright columns (32).

8. The strength testing device for wood composite boards according to claim 7, characterized in that, Both ends of the support shaft (33) are respectively hinged with foldable side support rods (34), and both axial ends of the support shaft (33) extend outwards through the upright columns (32).

9. The strength testing device for wood composite boards according to claim 8, wherein, It further includes: a guiding sliding frame (35) slidably sleeved on the upright column (32); a connecting rod (36) with both ends respectively hinged to the bottom of the side support rod (34) and the guiding sliding frame (35); a first telescopic driver (37) fixed on the upright column (32), with its output end connected to the guiding sliding frame (35) for driving it to lift and lower.

10. The testing method using the strength testing device for wood composite boards according to any one of claims 1-9, characterized in that, It includes the following steps: S1. Initial positioning: Control the electric push rod (42) of the lateral centering mechanism to extend, so that the centering roller (44) is lifted above the support shaft (33) of the support frame (3); Horizontally place the wood composite board to be tested on the two side centering rollers (44); S2. Longitudinal centering positioning: Start the hydraulic actuator (6) of the pressure testing mechanism to move downwards, so that the stop blocks (781) at both ends of the adjusting screw (78) of the pressing unit (7) are arranged on the front and rear sides of the board; Control the electromagnetic clutch (721) to be energized to connect the driving main shaft (72) and the guiding auxiliary rod (77); Start the roller driving mechanism (74) to drive the driving main shaft (72) to rotate, and drive the synchronous belt (763) to move through the guiding auxiliary rod (77); Drive the adjusting screw (78) to rotate, so that the two stop blocks (781) move towards each other along the stop rod (782) to clamp both sides of the board, and after clamping, reversely drive the driving main shaft (72) to rotate to reset the clamping stop blocks (781); The electromagnetic clutch (721) is de-energized to separate the driving main shaft (72) and the guiding auxiliary rod (77); S3. Lateral centering positioning: Keep the hydraulic actuator (6) in the downward pressing state, so that the driving roller (73) contacts the upper surface of the board; Start the roller driving mechanism (74) to drive the driving roller (73) to rotate, driving the board to move horizontally; Compare the values of the two groups of first pressure sensors (43) in real time, and stop rotating when the values on both sides are equal; S4. Support adjustment and pressure testing: Contract the electric push rod (42) to lower the board to the support shaft (33); Start the first telescopic driver (37) to lift the guiding sliding frame (35); Control the hydraulic actuator (6) to pressurize to the set value, and record the test data through the second pressure sensor (61).

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