High-density fiberboard strength detection device

Abstract

The invention 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 part, an outer cylinder, a side plate, a first sliding plate, a bottom plate, a first end plate and a first positioning plate and is used for calibrating the front-back distance of a fiberboard to enable the center of the fiberboard to correspond to the detection part. According to the high-density fiberboard strength detection device, a first rotating shaft rotates to drive a first sliding plate to slide in a first sliding opening, and the first sliding plate drives a first end plate and a first positioning plate to extrude a fiberboard through a bottom plate; therefore, workers can be replaced to automatically calibrate the front and back positions of the fiberboard, so that the center of the fiberboard corresponds to a detection piece, and errors generated during bending testing are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of fiberboard detection, and in particular to a high-density fiberboard strength detection device. Background Art

[0002] High-density fiberboard is a type of board made from wood fiber or other plant fiber, applied with urea-formaldehyde or other synthetic resins under heating and pressure conditions. This type of board has good physical properties, such as high hardness and strength, and has certain shaping capabilities. Therefore, it is often used as the main material for products such as furniture manufacturing, interior decoration, office facilities, and automobile interiors.

[0003] In the process of producing and processing high-density fiberboard, in order to ensure the performance of high-density fiberboard products, it is necessary to conduct strength testing on the high-density fiberboard. The strength test of high-density fiberboard mainly includes tests on flatness, density, wear resistance and bending resistance.

[0004] When conducting strength tests on fiberboards, fiberboard bending tests are used to detect the bending properties of the fiberboards. When conducting bending tests on fiberboards, the center of the fiberboard needs to correspond to the contact point of the test piece so that the lengths of both sides of the fiberboard are the same when bent. However, existing fiberboard bending test equipment usually relies on manual labor to place the fiberboard on a support seat when testing the fiberboard, making it difficult to ensure that the center of the fiberboard is accurately aligned with the contact point of the test piece. If the center is offset, the lengths of the two sides will be unequal when bent, which will lead to deviations in the test results.

[0005] Therefore, the present invention provides a high-density fiberboard strength detection device to solve the above problems. Summary of the Invention

[0006] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a high-density fiberboard strength testing device to solve the above-mentioned problem that it is difficult to ensure that the center of the fiberboard and the contact point of the testing piece are accurately aligned manually. If the center is offset, the lengths of the two sides will be unequal when bending, which will lead to deviation in the test results.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is:

[0008] A high-density fiberboard strength testing device includes a body, a detection assembly provided on the body, the detection assembly including a lower mounting seat and an upper mounting seat provided in a region of the body to be tested, a driving source provided on the upper mounting seat, a piston rod end of the driving source connected to a lifting column, and a detection member provided at the bottom of the lifting column;

[0009] A first adjustment assembly is provided on the outside of the lifting column. The first adjustment assembly includes an outer cylinder provided on the outside of the lifting column. Two side plates are symmetrically provided on the surface of the outer cylinder. A first sliding opening is provided on the side plates. A first sliding plate is slidably connected to the inside of the first sliding opening. A bottom plate is provided at the bottom of the first sliding plate. A first end plate is provided at the bottom of the bottom plate. A first positioning plate is provided on one side of the first end plate for calibrating the front-to-back distance of the fiberboard so that its center corresponds to the detection member.

[0010] The second adjusting component is arranged on the side panel and is used for calibrating the left and right inclination of the fiberboard.

[0011] Preferably, an outer ring is provided on the outside of the outer cylinder, 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, a top plate is provided on the top of the side plate, one side of the two top plates is rotatably connected to the first rotating shaft, the two first rotating shafts have threaded sections and spiral grooves, and the first sliding plate is threadedly connected to the threaded section of the first rotating shaft.

[0012] Preferably, a first limiting shaft is fixed on one side of each of the two first positioning plates, a first limiting hole adapted to the first limiting shaft is opened on the first end plate, and 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, a first sliding ring is provided on the threaded section of the first rotating shaft, a first driving block is fixed on the inner wall of the first sliding ring, the first driving block is slidably connected to the inside of the threaded section of the first rotating shaft, a first sleeve is provided on the outer wall of the first sliding ring, and the outer wall of the first sliding ring is rotatably connected to the inner wall of the first sleeve, a bottom groove is provided on the top of the side plate, and the bottom of the first sleeve is slidably connected to the inside of the corresponding bottom groove, a gear is fixed on the end of the first rotating shaft away from the top plate, a rack is fixed on the outer wall of the lifting column, and the rack is meshed with the gear.

[0014] Preferably, a linkage groove is provided on the inner wall of the outer cylinder, and the linkage groove consists of an arc segment and a vertical segment, and the top of the vertical segment is connected to the bottom end of the arc segment, and a linkage end block is fixed on 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 adjustment assembly includes side panels fixed on both sides of the side panels, a second ring is rotatably connected between each two side panels, a linkage support plate is fixed on the second ring, a second end plate is provided on the side of the linkage support plate away from the second ring, and a second positioning plate is provided on the side of the second end plate facing the side panel, and the second positioning plate is used to position the fiberboard.

[0016] Preferably, a second limiting shaft is fixed on the side of the second positioning plate facing the second end plate, a second limiting hole adapted to the second limiting shaft is opened on the side of the second end plate facing the second positioning plate, and the second limiting shaft is slidably connected inside the corresponding second limiting hole, and a second return 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 slidably connected to the second sliding plate, and one side of the second sliding plate is fixed to the 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 adapted to the third limiting shaft, and the third limiting shaft is slidably connected to the inside of the corresponding third limiting hole, the linkage support plate is provided with a accommodating hole, and the third limiting shaft also slides inside the corresponding accommodating hole, and a third return spring is fixed between one side of the second sliding plate and the inner wall of the first opening.

[0018] Preferably, a driving shaft is provided on one side of the side plate, and one end of the driving shaft passes through the side plate and is fixed on one end of the second sleeve ring. A second sliding ring is connected to the driving shaft, and a limiting groove is provided on the driving shaft, and the limiting groove is spiral-shaped. A linkage block is fixed on the inner wall of the second sliding ring, and the linkage block is slidably connected to the inside of the limiting groove. A push plate is fixed on the second sliding ring, and a support plate is fixed between the two push plates.

[0019] Preferably, a limiting slider is fixed on the surface of the second sliding ring, and limiting grooves adapted to the limiting slider are provided on both sides of the side plate, and the limiting slider is slidably connected in the corresponding limiting groove, and a fourth reset spring is fixed between the limiting slider and the limiting groove.

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

[0021] 1. The driving source drives the lifting column to descend, and the lifting column drives the detection part to move downward, so as to perform a bending test on the fiberboard on the lower mounting seat, so as to obtain the strength performance of the fiberboard.

[0022] 2. By rotating the first rotating shaft, the first sliding plate is driven to slide inside the first sliding port, and the first sliding plate drives the first end plate and the first positioning plate through the bottom plate to squeeze the fiberboard, thereby replacing the staff to automatically calibrate the front and rear positions of the fiberboard, so that the center of the fiberboard corresponds to the detection part, avoiding errors during the bending test.

[0023] 3. The second limit shaft rotates to drive the ring to rotate, and the ring drives the second positioning plate to be horizontal, and the push plate drives the second sliding plate to slide on the support plate, and the second sliding plate drives the second positioning plate to slide toward the limit plate through the second end plate, thereby replacing manual calibration of the left and right inclination of the fiberboard, thereby avoiding inaccurate measurement results when the fiberboard is tilted for bending testing.

[0024] 4. Through the cooperation of the first limiting shaft, the first limiting hole and the first return spring, the first positioning plate can be calibrated for fiberboards of different lengths. Through the cooperation of the third limiting shaft, the third limiting hole and the third return spring, the second positioning plate can be calibrated for fiberboards of different widths, thereby improving the practicality of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the present invention;

[0026] Figure 2 It is a structural schematic diagram of the detection component of the present invention;

[0027] Figure 3 is a schematic structural diagram of the first adjustment component of the present invention;

[0028] Figure 4 is a schematic structural diagram of the second adjustment component of the present invention;

[0029] Figure 5 It is a structural schematic diagram of the support plate of the present invention.

[0030] In the picture:

[0031] 10. Body;

[0032] 20. Detection assembly; 21. Lower mounting seat; 22. Upper mounting seat; 23. Drive source; 24. Lifting column; 25. Detection piece;

[0033] 30. First adjustment assembly; 31. Outer cylinder; 32. Outer ring; 33. Top limit shaft; 34. Side plate; 35. Top plate; 36. First rotating shaft; 37. First sliding plate; 38. First sliding opening; 39. Bottom plate; 310. First end plate; 311. First positioning plate; 312. First limit shaft; 314. First return spring; 315. First sliding ring; 316. First sleeve ring; 317. Bottom groove; 318. Gear; 319. Rack; 320. Linkage groove; 321. Linkage end block;

[0034] 40. Second adjustment assembly; 41. Side plate; 42. Second sleeve; 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 slide groove; 422. Fourth return spring. DETAILED DESCRIPTION

[0035] The following will describe various embodiments of the present invention in detail with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0036] As attached Figure 1-Figure 5 As shown, a high-density fiberboard strength detection device includes a body 10, on which a detection component 20 and a first adjustment component 30 are provided. The detection 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 to ensure that the middle part of the fiberboard corresponds to the bending detection position that is pressed down.

[0037] The detection assembly 20 includes a lower mounting seat 21 and an upper mounting seat 22 mounted on the area to be detected of the body 10, and the upper mounting seat 22 is located above the lower mounting seat 21. The top of the lower mounting seat 21 has two support arms for carrying the fiberboard, so as to facilitate the bending test of the fiberboard. A driving source 23 is installed on the upper mounting seat 22, and a lifting column 24 is provided on the lower side of the upper mounting seat 22. The top of the lifting column 24 is fixed to the piston rod end of the driving source 23. The bottom of the lifting column 24 is installed with a detection member 25 for pressing down the fiberboard, so that the fiberboard can be bent.

[0038] The first adjustment assembly 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 to limit 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 seat 22 to support the outer ring 32, thereby maintaining the stability of the outer ring 32.

[0039] Two side plates 34 are symmetrically fixed to the surface of the outer cylinder 31, and a top plate 35 is fixed to the top of the two side plates 34. One side of the two top plates 35 is rotatably connected to the first rotating shaft 36. The two first rotating shafts 36 have threaded sections and spiral grooves. The threaded sections of the two first rotating shafts 36 are threadedly connected to the first sliding plates 37. The tops of the two side plates 34 are provided with first sliding openings 38 that are compatible with the first sliding plates 37, and the two first sliding plates 37 are slidably connected to the corresponding first sliding openings 38. The bottoms of the two first sliding plates 37 are fixed with a bottom plate 39, and the bottoms of the two bottom plates 39 are fixed with a first end plate 310. One side of the two first end plates 310 is provided with a first positioning plate 311. When the two first positioning plates 311 approach each other, they can push the fiberboard on the lower mounting seat 21, so that the middle part of the fiberboard corresponds to the detection part 25.

[0040] A first limiting shaft 312 is fixed to one side of each of the two first positioning plates 311, and a first limiting hole that is compatible with the first limiting shaft 312 is opened on the first end plate 310, and the first limiting shaft 312 is slidably connected to the inside of the corresponding first limiting hole. The first limiting shaft 312 cooperates with the first limiting hole to limit the first positioning plate 311, thereby maintaining the stability of the first positioning plate 311 when sliding. 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, for supporting the first positioning plate 311, so that there is a buffer space when the first positioning plate 311 contacts the fiberboard.

[0041] A first sliding ring 315 is provided on the threaded section of the first rotating shaft 36, and a first driving block is fixed to the inner wall of the first sliding ring 315, which is slidably connected to the inside of the threaded section of the first rotating shaft 36. A first sleeve 316 is provided on the outer wall of the first sliding ring 315, and the outer wall of the first sliding ring 315 is rotatably connected to the inner wall of the first sleeve 316. A bottom groove 317 is provided on the top of the side plate 34, and the bottom of the first sleeve 316 is slidably connected to the inside of the corresponding bottom groove 317. A gear 318 is fixed to the end of the first rotating shaft 36 away from the top plate 35, and a rack 319 is fixed to the outer wall of the lifting column 24, and the rack 319 is meshed with the gear 318. The rack 319 cooperates with the gear 318 to drive the first rotating shaft 36 to rotate.

[0042] A linkage groove 320 is provided on the inner wall of the outer cylinder 31, and the linkage groove 320 consists of an arc segment and a vertical segment, and the top of the vertical segment is connected to the bottom end of the arc segment. A linkage end block 321 is fixed to the outer wall of the lifting column 24, and the linkage end block 321 is slidably connected to the inside of the linkage groove 320.

[0043] When performing a bending test on the fiberboard, the fiberboard is first placed on the two support arms, and then the driving source 23 is turned on through 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 trajectory of the linkage groove 320 through the linkage end block 321. When the linkage end block 321 slides along the first section of the arc segment of the linkage groove 320 to its tail end, the outer cylinder 31 rotates 90° inside the outer ring 32. At this time, the side plate 34 drives the first end plate 310 and the first positioning plate 311 on the bottom plate 39 to rotate to both sides of the fiberboard through the first rotating shaft 36 and the first sliding plate 37. As the lifting column 24 continues to descend, the linkage end block 321 slides from the arc segment of the linkage groove 320 to the inside of the vertical section.

[0044] When the lifting column 24 moves downward, the gear 318 cooperates with the rack 319 to drive the first rotating shaft 36 to rotate, and the first rotating shaft 36 drives the first sliding ring 315 to slide on its surface, and the first sliding ring 315 slides from the first section of the first rotating shaft 36 to its tail end, and the threaded section of the first rotating shaft 36 drives the first sliding plate 37 to slide inside the first sliding mouth 38. At this time, the first sliding plate 37 will first slide from the first section of the first sliding mouth 38 to its tail end, and the two first positioning plates 311 will move away from each other. When the linkage end block 321 slides from the arc section of the linkage groove 320 to the inside of the vertical section, the first sliding plate 37 slides from the tail end of the first sliding mouth 38 to its first section, and the first sliding plate 37 drives the first sliding ring 315 to slide on its surface. When the two first positioning plates 311 are close to each other, the first positioning plates 311 will push the fiberboard to slide on the support arm until the two first positioning plates 311 are against the fiberboard at the same time, so as to avoid the two first positioning plates 311 being stuck due to the fiberboard. At this time, the first positioning plate 311 will slide toward the corresponding first end plate 310, and the first limiting shaft 312 will slide inside the first limiting hole and compress the first return spring 314 to make avoidance space for the first positioning plate 311, thereby positioning the front and rear positions of the fiberboard, ensuring that the center of the first positioning plate 311 corresponds to the detection part 25, thereby preventing the deviation of the results when the fiberboard is bent.

[0045] A second adjustment assembly 40 is provided on the side panel 34 for adjusting the left and right position of the fiberboard, thereby preventing the fiberboard from tilting on the support arm.

[0046] The second adjustment assembly 40 includes side panels 41 fixed on both sides of the side panels 34, and a second ring 42 is rotatably connected between every two side panels 41. A linkage support plate 43 is fixed on the second ring 42. A second end plate 44 is provided on the side of the linkage support plate 43 away from the second ring 42, and a second positioning plate 45 is provided on the side of the second end plate 44 facing the side panel 34. The second positioning plate 45 is used to position the fiberboard to prevent the fiberboard from tilting left or right.

[0047] A second limiting shaft 46 is fixed on the side of the second positioning plate 45 facing the second end plate 44, and a second limiting hole that is compatible with the second limiting shaft 46 is opened on the side of the second end plate 44 facing the second positioning plate 45, and the second limiting shaft 46 is slidably connected inside the corresponding second limiting hole, and a second return spring 48 is fixed between the second end plate 44 and the second positioning plate 45.

[0048] A first opening 49 is provided on the linkage support plate 43, and a second sliding plate 410 is slidably connected to the inner wall of the first opening 49, and one side of the second sliding plate 410 is fixed to the side of the corresponding second end plate 44. A third limiting shaft 411 is fixed to the inner wall of the first opening 49, and a third limiting hole adapted to the third limiting shaft 411 is provided 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 accommodating hole is provided on the linkage support plate 43, and the third limiting shaft 411 also slides inside the corresponding accommodating 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.

[0049] 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, and a limiting groove 416 is provided on the drive shaft 414, and the limiting groove 416 is spiral. A linkage block is fixed to the inner wall of the second sliding ring 415, and the linkage block is slidably connected to the inside of the limiting 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.

[0050] A limiting slider 420 is fixed to the surface of the second sliding ring 415, and limiting grooves 421 adapted to the limiting slider 420 are provided on both sides of the side plate 34, and the limiting slider 420 is slidably connected in the corresponding limiting groove 421, and a fourth return spring 422 is fixed between the limiting slider 420 and the limiting groove 421.

[0051] When the first rotating shaft 36 rotates, the first sliding ring 315 slides from the front section of the first rotating shaft 36 to its rear end. At this time, the first ring 316 does not contact the support plate 418 until the linkage end block 321 slides from the arc section of the linkage groove 320 to the inside of the vertical section. The first ring 316 will press against the support plate 418, and the support plate 418 drives the connected second sliding ring 415 to slide on the surface of the drive shaft 414 through the push plate 417. The second sliding ring 415 drives the connected drive shaft 414 to rotate through the linkage block, and the drive shaft 414 drives the second ring 42 to rotate.

[0052] Since the limiting groove 416 has a positive spiral section, a transverse section and a reverse spiral section, when the linkage block slides from the positive spiral section to the inside of the transverse section, the second ring 42 drives the linkage support plate 43 from an inclined state to a horizontal state. As the linkage block slides inside the transverse section, the push plate 417 will press against the second sliding plate 410, and the second sliding plate 410 slides inside the first opening 49, and the second sliding plate 410 drives the second positioning plate 45 to slide toward the fiberboard through the second end plate 44, thereby calibrating the fiberboard left and right to prevent the fiberboard from tilting, and the cooperation of the second limiting shaft 46, the second limiting hole and the second return spring 48 also allows the second positioning plate 45 to have avoidance space to prevent the two second positioning plates 45 from getting stuck when calibrating the fiberboard, and can It can stir fiberboards of different widths and increase its practical performance. When the linkage block slides from the transverse section to the inside of its anti-spiral section, the drive shaft 414 drives the second ring 42 to rotate in the opposite direction, so that the linkage support plate 43 is unfolded into an inclined shape again, thereby making the fiberboard break away from the contact with the second positioning plate 45, avoiding the friction of the second positioning plate 45 during the bending test of the fiberboard. When the fiberboard inspection 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 in the opposite direction. The first sliding ring 315 slides from the tail end of the first rotating shaft 36 to its head section, and the support plate 418 is separated from the restriction of the first sliding ring 315, and the fourth reset spring 422 in a compressed state drives the second sliding ring 415 to reset.

[0053] Thus far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present invention.

Claims

1. A high-density fiberboard strength testing device, characterized in that: The invention comprises a machine body (10), wherein a detection assembly (20) is provided on the machine body (10), and the detection assembly (20) comprises a lower mounting seat (21) and an upper mounting seat (22) provided in a region to be detected of the machine body (10), a driving source (23) is provided on the upper mounting seat (22), a piston rod end of the driving source (23) is connected to a lifting column (24), and a detection member (25) is provided at the bottom of the lifting column (24); A first adjustment component (30) is provided on the outside of the lifting column (24). The first adjustment component (30) includes an outer cylinder (31) provided on the outside of the lifting column (24). Two side plates (34) are symmetrically provided on the surface of the outer cylinder (31). A first sliding opening (38) is provided on the side plates (34). The first sliding opening (38) is slidably connected to a first sliding plate (37) inside. 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-to-back distance of the fiberboard so that its center corresponds to the detection member (25). The second adjustment component (40) is arranged on the side plate (34) and is used to calibrate the left and right inclination of the fiberboard.

2. A high-density fiberboard strength detection device according to claim 1, characterized in that: An outer ring (32) is provided on the outside of the outer cylinder (31), 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 seat (22), a top plate (35) is provided on the top of the side plate (34), one side of each of the two top plates (35) is rotatably connected to a first rotating shaft (36), both of the two first rotating shafts (36) have a threaded section and a spiral groove, and the first sliding plate (37) is threadedly connected to the threaded section of the first rotating shaft (36).

3. A high-density fiberboard strength detection 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 to the inside of 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. A high-density fiberboard strength detection 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), and the first driving block is slidably connected to the inside of the threaded section of the first rotating shaft (36), a first sleeve (316) is provided on the outer wall of the first sliding ring (315), and the outer wall of the first sliding ring (315) is rotatably connected to the inner wall of the first sleeve (316), a bottom groove (317) is provided on the top of the side plate (34), and the bottom of the first sleeve (316) is slidably connected to the inside of the corresponding bottom groove (317), a gear (318) is fixed to 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), and 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 segment and a vertical segment, and the top of the vertical segment is connected to the bottom of the arc segment. A linkage end block (321) is fixed to the outer wall of the lifting column (24), and the linkage end block (321) is slidably connected to the inside of the linkage groove (320).

6. The high-density fiberboard strength testing device according to claim 5, characterized in that: The second adjustment assembly (40) includes side plates (41) fixed on both sides of the side plates (34), a second ring (42) is rotatably connected between each two side plates (41), a linkage support plate (43) is fixed on the second ring (42), a second end plate (44) is provided on the side of the linkage support plate (43) away from the second ring (42), and a second positioning plate (45) is provided on the side of the second end plate (44) facing the side plate (34), and the second positioning plate (45) is used to position the fiberboard.

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

8. The high-density fiberboard strength testing device according to claim 7, characterized in that: The linkage support plate (43) is provided with a first opening (49), the inner wall of the first opening (49) is slidably connected to the second sliding plate (410), and 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), the second sliding plate (410) is provided with a third limiting hole adapted to the third limiting shaft (411), and the third limiting shaft (411) is slidably connected to the inside of the corresponding third limiting hole, the linkage support plate (43) is provided with a receiving hole, and the third limiting shaft (411) also slides inside the corresponding receiving hole, and 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).

9. The high-density fiberboard strength testing device according to claim 8, characterized in that: A driving shaft (414) is provided on one side of the side plate (41), and one end of the driving shaft (414) passes through the side plate (41) and is fixed on one end of the second sleeve ring (42). A second sliding ring (415) is connected to the driving shaft (414), and a limiting groove (416) is provided on the driving shaft (414), and the limiting groove (416) is spiral-shaped. A linkage block is fixed on the inner wall of the second sliding ring (415), and the linkage block is slidably connected to the inside of the limiting groove (416). A pushing plate (417) is fixed on the second sliding ring (415), and a supporting plate (418) is fixed between the two pushing plates (417).

10. The high-density fiberboard strength testing device according to claim 9, characterized in that: A limiting slider (420) is fixed on the surface of the second sliding ring (415), and limiting grooves (421) adapted to the limiting slider (420) are provided on both sides of the side plate (34), and the limiting slider (420) is slidably connected in the corresponding limiting groove (421), and a fourth return spring (422) is fixed between the limiting slider (420) and the limiting groove (421).

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