A high-density fiberboard strength detection device

Abstract

The application relates to the technical field of fiberboard detection, in particular to a high-density fiberboard strength detection device, which comprises a machine body, a lower mounting seat, an upper mounting seat, a driving source, a lifting column, a detection piece, an outer cylinder, a side plate, a first sliding plate, a bottom plate, a first end plate and a first positioning plate, is used for calibrating the front-rear distance of a fiberboard so that the center of the fiberboard corresponds to the detection piece. The high-density fiberboard strength detection device can automatically calibrate the front-rear position of the fiberboard by rotating the first rotating shaft, driving the first sliding plate to slide in the first sliding port, and extruding the fiberboard by the first sliding plate, the bottom plate, the first end plate and the first positioning plate, so that the center of the fiberboard corresponds to the detection piece, and errors in the bending test are avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fiberboard detection, and particularly relates to a high-density fiberboard strength detection device. BACKGROUND

[0002] The high-density fiberboard is a kind of board material which is made of wood fiber or other plant fiber as raw material, and is pressed under the condition of heating and pressing by applying urea-formaldehyde resin or other synthetic resin. The board material has good physical properties, such as high hardness, high strength, and certain modeling ability, and is often used as the main material of furniture manufacturing, indoor decoration, office facilities, and automotive interior products.

[0003] In the process of producing and processing the high-density fiberboard, in order to ensure the performance of the high-density fiberboard product, the strength of the high-density fiberboard needs to be tested. The strength test of the high-density fiberboard mainly includes the tests of flatness, density, wear resistance, and bending resistance.

[0004] When the fiberboard is tested for strength, the fiberboard bending test is used to detect the bending performance of the fiberboard. Since the center of the fiberboard needs to correspond to the contact point of the detection piece when the fiberboard is tested for bending, the lengths of the two sides are the same when the fiberboard is bent. However, the existing fiberboard bending test equipment usually relies on manual placement of the fiberboard on the bearing seat when testing the fiberboard, and it is difficult to ensure the precise alignment of the center of the fiberboard with the contact point of the detection piece. If the center is offset, the lengths of the two sides are not equal when the fiberboard is bent, which may cause deviation of the test results.

[0005] Therefore, the present application provides a high-density fiberboard strength detection device to solve the above problems. SUMMARY

[0006] In view of the above problems, the present application provides a high-density fiberboard strength detection device to solve the problem that it is difficult for manual operation to ensure the precise alignment of the center of the fiberboard with the contact point of the detection piece, and if the center is offset, the lengths of the two sides are not equal when the fiberboard is bent, which may cause deviation of the test results.

[0007] In order to achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0008] A high-density fiberboard strength detection device, comprising a machine body, a detection assembly is arranged on the machine body, the detection assembly comprises a lower mounting seat and an upper mounting seat arranged in a detection area of the machine body, a driving source is arranged on the upper mounting seat, a lifting column is connected to the piston rod end of the driving source, and a detection piece is arranged at the bottom of the lifting column.

[0009] The first adjusting assembly is arranged outside the lifting column, and comprises an outer cylinder arranged outside the lifting column, two side plates symmetrically arranged on the surface of the outer cylinder, a first sliding opening formed in the side plate, a first sliding plate slidably connected to the inside of the first sliding opening, a bottom plate arranged at the bottom of the first sliding plate, a first end plate arranged at the bottom of the bottom plate, a first positioning plate arranged on one side of the first end plate, and the first positioning plate is used for calibrating the front and back distance of the fiber plate so that the center of the fiber plate corresponds to the detection piece.

[0010] The second adjusting assembly is arranged on the side plate and is used for calibrating the left and right inclination of the fiber plate.

[0011] Preferably, the outer wall of the outer cylinder is provided with an outer ring, the top of the outer cylinder is rotatably connected to the bottom of the outer ring, a top limiting shaft is fixed between the top of the outer ring and the bottom of the upper mounting seat, the top of the side plate is provided with a top plate, a first rotating shaft is rotatably connected to one side of each of the two top plates, each of the two first rotating shafts has a threaded segment and a helical groove, and the first sliding plate is threadedly connected to the threaded segment of the first rotating shaft.

[0012] Preferably, the first limiting shaft is fixed on one side of each of the two first positioning plates, a first limiting hole matched with the first limiting shaft is formed in the first end plate, the first limiting shaft is slidably connected to the inside of the corresponding first limiting hole, a first return spring is fixed between the first end plate and the first positioning plate, and the first return spring is located outside the first limiting shaft.

[0013] Preferably, the threaded segment of the first rotating shaft is provided with a first sliding ring, the inner wall of the first sliding ring is fixed with a first driving block, the first driving block is slidably connected to the inside of the threaded segment of the first rotating shaft, the outer wall of the first sliding ring is provided with a first sleeve ring, the outer wall of the first sliding ring is rotatably connected to the inner wall of the first sleeve ring, a bottom groove is formed in the top of the side plate, the bottom of the first sleeve ring is slidably connected to the inside of the corresponding bottom groove, a gear is fixed to the end of the first rotating shaft away from the top plate, a rack is fixed to the outer wall of the lifting column, and the rack is meshingly connected with the gear.

[0014] Preferably, the inner wall of the outer cylinder is provided with a linkage groove, the linkage groove is composed of an arc segment and a vertical segment, the top of the vertical segment is in communication with the bottom end of the arc segment, a linkage end block is fixed to the outer wall of the lifting column, and the linkage end block is slidably connected to the inside of the linkage groove.

[0015] Preferably, the second adjusting assembly comprises side plates fixed on both sides of the side plate, a second sleeve ring rotatably connected between every two side plates, a linkage support plate fixed to the second sleeve ring, a second end plate arranged on the side of the linkage support plate away from the second sleeve ring, and a second positioning plate arranged on the side of the second end plate facing the side plate, and the second positioning plate is used for positioning the fiber plate.

[0016] Preferably, one side of the second positioning plate towards the second end plate is fixed with a second limiting shaft, the second end plate towards the second positioning plate is provided with a second limiting hole matched with the second limiting shaft, and the second limiting shaft is slidingly connected in the corresponding second limiting hole, and the second reset spring is fixed between the second end plate and the second positioning plate.

[0017] Preferably, the linkage support plate is provided with a first opening, the inner wall of the first opening is slidingly connected with a second sliding plate, one side of the second sliding plate is fixed on one side of the corresponding second end plate, the inner wall of the first opening is fixed with a third limiting shaft, the second sliding plate is provided with a third limiting hole matched with the third limiting shaft, and the third limiting shaft is slidingly connected in the corresponding third limiting hole, the linkage support plate is provided with an accommodating hole, and the third limiting shaft is also slidingly connected in the corresponding accommodating hole, and the third reset spring is fixed between one side of the second sliding plate and the inner wall of the first opening.

[0018] Preferably, one side of the side plate is provided with a driving shaft, one end of the driving shaft penetrates through the side plate and is fixed on one end of the second sleeve ring, the driving shaft is connected with a second sliding ring, the driving shaft is provided with a limiting groove, and the limiting groove is spiral, the inner wall of the second sliding ring is fixed with a linkage block, and the linkage block is slidingly connected in the limiting groove, the second sliding ring is fixed with a pushing plate, and the two pushing plates are fixed with a supporting plate.

[0019] Preferably, the surface of the second sliding ring is fixed with a limiting sliding block, both sides of the side plate are provided with a limiting sliding groove matched with the limiting sliding block, and the limiting sliding block is slidingly connected in the corresponding limiting sliding groove, and the fourth reset spring is fixed between the limiting sliding block and the limiting sliding groove.

[0020] The beneficial effects of the present application are:

[0021] 1. The driving source drives the lifting column to descend, and the lifting column drives the detection piece to move downward, so as to test the bending of the fiber plate on the lower mounting seat, thereby facilitating the strength performance of the fiber plate.

[0022] 2. The first rotating shaft is rotated to drive the first sliding plate to slide in the first sliding opening, and the first sliding plate drives the first end plate and the first positioning plate to extrude the fiber plate through the bottom plate, thereby automatically calibrating the front and rear positions of the fiber plate instead of the staff, so that the center of the fiber plate corresponds to the detection piece, and the error during the bending test is avoided.

[0023] 3, through the second limit axis rotation, drive the ring to rotate, the ring drive second positioning plate is horizontal, and the push plate is driven second sliding plate on the support plate sliding, and the second sliding plate is driven by the second end plate second positioning plate slides to the limiting plate, thereby replacing the manual fiberboard accurate left and right inclination calibration, thereby avoiding the fiberboard is inclined to bend test, resulting in inaccurate measurement results.

[0024] 4, through the cooperation of the first limiting shaft, the first limiting hole and the first return spring, the first positioning plate can calibrate fiberboards of different lengths, and through the cooperation of the third limiting shaft, the third limiting hole and the third return spring, the second positioning plate can calibrate fiberboards of different widths, thereby improving the practicability of the equipment. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a structural diagram of the present application;

[0026] Figure 2 is a structural diagram of the detection assembly of the present application;

[0027] Figure 3 is a structural diagram of the first adjusting assembly of the present application;

[0028] Figure 4 is a structural diagram of the second adjusting assembly of the present application;

[0029] Figure 5 is a structural diagram of the support plate of the present application.

[0030] In the figure:

[0031] 10, machine body;

[0032] 20, detection assembly; 21, lower mounting seat; 22, upper mounting seat; 23, driving source; 24, lifting column; 25, detection piece;

[0033] 30, first adjusting assembly; 31, outer cylinder; 32, outer ring; 33, top limiting shaft; 34, side plate; 35, top plate; 36, first rotating shaft; 37, first sliding plate; 38, first sliding port; 39, bottom plate; 310, first end plate; 311, first positioning plate; 312, first limiting shaft; 314, first return spring; 315, first sliding ring; 316, first ring; 317, bottom groove; 318, gear; 319, rack; 320, linkage groove; 321, linkage end block;

[0034] 40. Second adjusting component; 41. Side plate; 42. Second collar; 43. Linkage support plate; 44. Second end plate; 45. Second positioning plate; 46. Second limiting shaft; 48. Second return spring; 49. First opening; 410. Second sliding plate; 411. Third limiting shaft; 413. Third return spring; 414. Drive shaft; 415. Second sliding ring; 416. Limiting groove; 417. Push plate; 418. Support plate; 420. Limiting slider; 421. Limiting groove; 422. Fourth return spring. Detailed Implementation

[0035] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0036] As attached Figures 1-5 As shown, a high-density fiberboard strength testing device includes a body 10, on which a testing component 20 and a first adjustment component 30 are provided. The testing component 20 is used to perform bending detection on the fiberboard, and the first adjustment component 30 is used to adjust the position of the fiberboard so as to ensure that the middle part of the fiberboard corresponds to the bending detection point under pressure.

[0037] The testing assembly 20 includes a lower mounting base 21 and an upper mounting base 22 mounted on the testing area of ​​the machine body 10, with the upper mounting base 22 located above the lower mounting base 21. The top of the lower mounting base 21 has two support arms for supporting the fiberboard, thus facilitating bending testing of the fiberboard. A drive source 23 is mounted on the upper mounting base 22, and a lifting column 24 is provided on the lower side of the upper mounting base 22. The top of the lifting column 24 is fixed to the piston rod end of the drive source 23, and a testing element 25 is mounted on the bottom of the lifting column 24 for pressing down on the fiberboard, thereby facilitating bending testing of the fiberboard.

[0038] The first adjustment component 30 includes an outer cylinder 31 disposed outside the lifting column 24. An outer ring 32 is disposed outside the outer cylinder 31, and the top of the outer cylinder 31 is rotatably connected to the bottom of the outer ring 32 for limiting the outer cylinder 31, thereby maintaining the stability of the outer cylinder 31. A top limiting shaft 33 is fixed between the top of the outer ring 32 and the bottom of the upper mounting base 22 for supporting the outer ring 32, thereby maintaining the stability of the outer ring 32.

[0039] The surface of the outer cylinder 31 is symmetrically fixed with two side plates 34, the top of each of the two side plates 34 is fixed with a top plate 35, one side of each of the two top plates 35 is rotationally connected with a first rotating shaft 36, the first rotating shaft 36 is provided with a threaded segment and a helical groove, the threaded segment of the first rotating shaft 36 is threadedly connected with a first sliding plate 37, the top of each of the two side plates 34 is provided with a first sliding opening 38 matched with the first sliding plate 37, and the first sliding plate 37 is slidingly connected in the first sliding opening 38, the bottom of each of the two first sliding plates 37 is fixed with a bottom plate 39, the bottom of each of the two bottom plates 39 is fixed with a first end plate 310, one side of each of the two first end plates 310 is provided with a first positioning plate 311, when the two first positioning plates 311 are close to each other, the fiber plate on the lower mounting seat 21 can be pushed, so that the middle part of the fiber plate corresponds to the detection piece 25.

[0040] One side of each of the two first positioning plates 311 is fixed with a first limiting shaft 312, the first end plate 310 is provided with a first limiting hole matched with the first limiting shaft 312, and the first limiting shaft 312 is slidingly connected in the first limiting hole, the first limiting shaft 312 cooperates with the first limiting hole to limit the first positioning plate 311, so as to keep the stability of the first positioning plate 311 when sliding, the first end plate 310 and the first positioning plate 311 are fixed with a first return spring 314, and the first return spring 314 is located outside the first limiting shaft 312, for supporting the first positioning plate 311, so that the first positioning plate 311 has a buffer space when abutting against the fiber plate.

[0041] The threaded segment of the first rotating shaft 36 is provided with a first sliding ring 315, the inner wall of the first sliding ring 315 is fixed with a first driving block, the first driving block is slidingly connected in the threaded segment of the first rotating shaft 36, the outer wall of the first sliding ring 315 is provided with a first sleeve ring 316, and the outer wall of the first sliding ring 315 is rotationally connected with the inner wall of the first sleeve ring 316, the top of the side plate 34 is provided with a bottom groove 317, and the bottom of the first sleeve ring 316 is slidingly connected in the bottom groove 317, one end of the first rotating shaft 36 away from the top plate 35 is fixed with a gear 318, the outer wall of the lifting column 24 is fixed with a rack 319, and the rack 319 is meshingly connected with the gear 318, and the rack 319 cooperates with the gear 318 to drive the first rotating shaft 36 to rotate.

[0042] The inner wall of the outer cylinder 31 is provided with a linkage groove 320, and the linkage groove 320 is composed of an arc segment and a vertical segment, and the top of the vertical segment is in communication with the bottom end of the arc segment, the outer wall of the lifting column 24 is fixed with a linkage end block 321, and the linkage end block 321 is slidingly connected in the linkage groove 320.

[0043] When the fiberboard is subjected to the bending test, the fiberboard is placed on the two supporting arms, and then the driving source 23 is started by the control system, the piston rod of the driving source 23 drives the lifting column 24 to move downward, and the lifting column 24 slides along the track of the linkage groove 320 through the linkage end block 321. When the linkage end block 321 slides to the tail end of the first section of the arc-shaped section of the linkage groove 320, the outer cylinder 31 rotates 90° inside the outer ring 32, and the side plate 34 drives the first end plate 310 and the first positioning plate 311 on the bottom plate 39 to rotate to the two sides of the fiberboard through the first rotating shaft 36 and the first sliding plate 37. With the continuous downward movement of the lifting column 24, the linkage end block 321 slides into the vertical section of the linkage groove 320.

[0044] Since the first sliding port 38 and the first rotating shaft 36 are close to the outer cylinder 31, the tail end of the first sliding port 38 and the first rotating shaft 36 is away from the outer cylinder 31. With the downward movement of the lifting column 24, the gear 318 drives the first rotating shaft 36 to rotate through the rack 319, and the first rotating shaft 36 drives the first sliding ring 315 to slide on the surface of the first rotating shaft 36. The first sliding ring 315 slides from the first section to the tail end of the first rotating shaft 36, and the threaded section of the first rotating shaft 36 drives the first sliding plate 37 to slide inside the first sliding port 38. At this time, the first sliding plate 37 slides from the first section to the tail end of the first sliding port 38, and the two first positioning plates 311 move away from each other. When the linkage end block 321 slides into the vertical section of the linkage groove 320, the first sliding plate 37 slides from the tail end to the first section of the first sliding port 38, and the first sliding plate 37 drives the first end plate 310 and the first positioning plate 311 of the bottom plate 39 to slide to the fiberboard. If the fiberboard is placed on the front and rear positions of the lower mounting seat 21, it means that the center position of the fiberboard does not correspond to the detection piece 25. When the two first positioning plates 311 move close to each other, the first positioning plate 311 abuts against the fiberboard and pushes the fiberboard to slide on the supporting arm until the two first positioning plates 311 abut against the fiberboard at the same time to avoid the first positioning plate 311 from being stuck due to the fiberboard. At this time, the first positioning plate 311 slides to the corresponding first end plate 310, and the first limiting shaft 312 slides in the first limiting hole and compresses the first return spring 314 to provide a space for the first positioning plate 311, thereby positioning the front and rear positions of the fiberboard and ensuring that the center of the first positioning plate 311 corresponds to the detection piece 25, thereby preventing the result from deviating when the fiberboard is subjected to the bending test.

[0045] The second adjusting assembly 40 is arranged on the side plate 34 to adjust the left and right positions of the fiberboard, thereby preventing the fiberboard from tilting on the supporting arm.

[0046] The second adjusting assembly 40 comprises side plates 41 fixed on both sides of the side plate 34, a second sleeve ring 42 rotationally connected between every two side plates 41, a linkage support plate 43 fixed on the second sleeve ring 42, a second end plate 44 provided on the side away from the second sleeve ring 42 of the linkage support plate 43, a second positioning plate 45 provided on the side of the second end plate 44 facing the side plate 34, and the second positioning plate 45 is used for positioning the fiber plate to prevent the fiber plate from tilting left and right.

[0047] The second positioning plate 45 is fixed with a second limiting shaft 46 on the side facing the second end plate 44, the second end plate 44 is provided with a second limiting hole matched with the second limiting shaft 46 on the side facing the second positioning plate 45, and the second limiting shaft 46 is slidingly connected in the corresponding second limiting hole. The second end plate 44 and the second positioning plate 45 are fixed with a second return spring 48.

[0048] The linkage support plate 43 is provided with a first opening 49, and a second sliding plate 410 is slidingly connected to the inner wall of the first opening 49. One side of the second sliding plate 410 is fixed to the corresponding side of the second end plate 44. The inner wall of the first opening 49 is fixed with a third limiting shaft 411, and the second sliding plate 410 is provided with a third limiting hole matched with the third limiting shaft 411. The third limiting shaft 411 is slidingly connected in the corresponding third limiting hole. The linkage support plate 43 is provided with a receiving hole, and the third limiting shaft 411 is also slidingly connected in the corresponding receiving hole. The third return spring 413 is fixed between the one side of the second sliding plate 410 and the inner wall of the first opening 49.

[0049] One side of the side plate 41 is provided with a driving shaft 414, and one end of the driving shaft 414 penetrates through the side plate 41 and is fixed to one end of the second sleeve ring 42. The driving shaft 414 is connected with a second sliding ring 415. The driving shaft 414 is provided with a limiting groove 416, and the limiting groove 416 is in a spiral shape. The inner wall of the second sliding ring 415 is fixed with a linkage block, and the linkage block is slidingly connected in the limiting groove 416. The second sliding ring 415 is fixed with a push plate 417, and the two push plates 417 are fixed with a support plate 418.

[0050] The surface of the second sliding ring 415 is fixed with a limiting sliding block 420. The two sides of the side plate 34 are provided with limiting sliding grooves 421 matched with the limiting sliding block 420, and the limiting sliding block 420 is slidingly connected in the corresponding limiting sliding groove 421. The fourth return spring 422 is fixed between the limiting sliding block 420 and the limiting sliding groove 421.

[0051] When the first rotating shaft 36 rotates, the first sliding ring 315 slides from the first end to the tail end of the first rotating shaft 36, and at this time, the first sleeve 316 does not contact the support plate 418 until the linkage block 321 slides from the arc-shaped section to the inside of the vertical section of the linkage groove 320, and the first sleeve 316 abuts against the support plate 418, and the support plate 418 drives the second sliding ring 415 connected thereto to slide on the surface of the driving shaft 414, and the second sliding ring 415 drives the driving shaft 414 connected thereto to rotate, and the driving shaft 414 drives the second sleeve 42 to rotate.

[0052] Since the limiting groove 416 has a positive helical section, a horizontal section and a reverse helical section, when the linkage block slides from the positive helical section to the inside of the horizontal section, the second sleeve 42 drives the linkage support plate 43 to change from the inclined state to the horizontal state, and as the linkage block slides in the horizontal section, the pushing plate 417 abuts against the second sliding plate 410, and the second sliding plate 410 slides in the first opening 49, and the second sliding plate 410 drives the second positioning plate 45 connected thereto to slide to the fiber plate through the second end plate 44, thereby calibrating the fiber plate left and right to avoid the fiber plate from being inclined, and the cooperation of the second limiting shaft 46, the second limiting hole and the second return spring 48 also provides the second positioning plate 45 with a clearance to prevent the two second positioning plates 45 from being stuck when calibrating the fiber plate, and can stir the fiber plate of different widths to increase the practical performance, and when the linkage block slides from the horizontal section to the inside of the reverse helical section, at this time, the driving shaft 414 drives the second sleeve 42 to rotate reversely, so that the linkage support plate 43 is unfolded again to be inclined, thereby making the fiber plate separate from the contact of the second positioning plate 45 to avoid the fiber plate from being affected by the friction of the second positioning plate 45 when the fiber plate is bent for testing, and after the testing of the fiber plate is completed, the lifting column 24 rises, and the gear 318 cooperates with the rack 319 to drive the first rotating shaft 36 to rotate reversely, and the first sliding ring 315 slides from the tail end to the first end of the first rotating shaft 36, and the support plate 418 is separated from the limitation of the first sliding ring 315, and the fourth return spring 422 in the compressed state drives the second sliding ring 415 to reset.

[0053] The technical scheme of the present application has been described in combination with the preferred embodiments shown in the drawings, but those skilled in the art can easily understand that the protection scope of the present application is obviously not limited to these specific embodiments. Those skilled in the art can make equivalent changes or replacements to the related technical features without departing from the principles of the present application, and the technical schemes after the changes or replacements will fall within the protection scope of the present application.

Claims

1. A high-density fiberboard strength testing device, characterized in that, Includes a body (10), on which a detection component (20) is provided. The detection component (20) includes a lower mounting base (21) and an upper mounting base (22) located in the area to be detected on the body (10). A drive source (23) is provided on the upper mounting base (22). A lifting column (24) is connected to the piston rod end of the drive source (23). A detection element (25) is provided at the bottom of the lifting column (24). The first adjustment component (30) is located outside the lifting column (24). The first adjustment component (30) includes an outer cylinder (31) located outside the lifting column (24). Two side plates (34) are symmetrically arranged on the surface of the outer cylinder (31). A first sliding opening (38) is opened on the side plate (34). A first sliding plate (37) is slidably connected inside the first sliding opening (38). A bottom plate (39) is provided at the bottom of the first sliding plate (37). A first end plate (310) is provided at the bottom of the bottom plate (39). A first positioning plate (311) is provided on one side of the first end plate (310) for calibrating the front and rear distance of the fiberboard so that its center corresponds to the detection piece (25). The second adjustment component (40) is located on the side plate (34) and is used to calibrate the left and right tilt of the fiberboard. The second adjustment component (40) includes side plates (41) fixed on both sides of the side plate (34), a second collar (42) is rotatably connected between each pair of side plates (41), a linkage support plate (43) is fixed on the second collar (42), a second end plate (44) is provided on the side of the linkage support plate (43) away from the second collar (42), and a second positioning plate (45) is provided on the side of the second end plate (44) facing the side plate (34), the second positioning plate (45) is used to position the fiberboard; A drive shaft (414) is provided on one side of the side plate (41), and one end of the drive shaft (414) passes through the side plate (41) and is fixed on one end of the second ring (42). A second sliding ring (415) is connected to the drive shaft (414). A limit groove (416) is opened on the drive shaft (414), and the limit groove (416) is spiral. A linkage block is fixed on the inner wall of the second sliding ring (415), and the linkage block is slidably connected inside the limit groove (416). A push plate (417) is fixed on the second sliding ring (415), and a support plate (418) is fixed between the two push plates (417).

2. The high-density fiberboard strength testing device according to claim 1, characterized in that, The outer cylinder (31) is provided with an outer ring (32) on its outside. The top of the outer cylinder (31) is rotatably connected to the bottom of the outer ring (32). A top limiting shaft (33) is fixed between the top of the outer ring (32) and the bottom of the upper mounting base (22). The top of the side plate (34) is provided with a top plate (35). One side of each of the two top plates (35) is rotatably connected to a first rotating shaft (36). Both of the first rotating shafts (36) have threaded sections and helical grooves. The first sliding plate (37) is threadedly connected to the threaded section of the first rotating shaft (36).

3. The high-density fiberboard strength testing device according to claim 2, characterized in that, A first limiting shaft (312) is fixed on one side of each of the two first positioning plates (311). A first limiting hole adapted to the first limiting shaft (312) is opened on the first end plate (310), and the first limiting shaft (312) is slidably connected inside the corresponding first limiting hole. A first return spring (314) is fixed between the first end plate (310) and the first positioning plate (311), and the first return spring (314) is located outside the first limiting shaft (312).

4. The high-density fiberboard strength testing device according to claim 3, characterized in that, A first sliding ring (315) is provided on the threaded section of the first rotating shaft (36). A first driving block is fixed on the inner wall of the first sliding ring (315). The first driving block is slidably connected inside the threaded section of the first rotating shaft (36). A first sleeve ring (316) is provided on the outer wall of the first sliding ring (315). The outer wall of the first sliding ring (315) is rotatably connected to the inner wall of the first sleeve ring (316). A bottom groove (317) is opened on the top of the side plate (34). The bottom of the first sleeve ring (316) is slidably connected inside the corresponding bottom groove (317). A gear (318) is fixed on the end of the first rotating shaft (36) away from the top plate (35). A rack (319) is fixed on the outer wall of the lifting column (24). The rack (319) is meshed with the gear (318).

5. The high-density fiberboard strength testing device according to claim 4, characterized in that, The inner wall of the outer cylinder (31) is provided with a linkage groove (320), and the linkage groove (320) is composed of an arc-shaped section and a vertical section. The top of the vertical section is connected to the bottom of the arc-shaped section. The outer wall of the lifting column (24) is fixed with a linkage end block (321), and the linkage end block (321) is slidably connected inside the linkage groove (320).

6. The high-density fiberboard strength testing device according to claim 1, characterized in that, The second positioning plate (45) is fixed with a second limiting shaft (46) on the side facing the second end plate (44). The second end plate (44) is provided with a second limiting hole that matches the second limiting shaft (46) on the side facing the second positioning plate (45). The second limiting shaft (46) is slidably connected inside the corresponding second limiting hole. A second return spring (48) is fixed between the second end plate (44) and the second positioning plate (45).

7. The high-density fiberboard strength testing device according to claim 6, characterized in that, The linkage support plate (43) has a first opening (49), and a second sliding plate (410) is slidably connected to the inner wall of the first opening (49). One side of the second sliding plate (410) is fixed to one side of the corresponding second end plate (44). A third limiting shaft (411) is fixed to the inner wall of the first opening (49). A third limiting hole adapted to the third limiting shaft (411) is opened on the second sliding plate (410), and the third limiting shaft (411) is slidably connected to the inside of the corresponding third limiting hole. A receiving hole is opened on the linkage support plate (43), and the third limiting shaft (411) also slides inside the corresponding receiving hole. A third return spring (413) is fixed between one side of the second sliding plate (410) and the inner wall of the first opening (49).

8. The high-density fiberboard strength testing device according to claim 7, characterized in that, The surface of the second sliding ring (415) is fixed with a limiting slider (420). Both sides of the side plate (34) are provided with limiting grooves (421) that are adapted to the limiting slider (420). The limiting slider (420) is slidably connected in the corresponding limiting groove (421). A fourth return spring (422) is fixed between the limiting slider (420) and the limiting groove (421).

Images