Device and method for detecting water absorption expansion rate of regenerated fiberboard

Abstract

The invention relates to the field of detection, in particular to a regenerated fiberboard water absorption expansion rate detection device and method.The regenerated fiberboard water absorption expansion rate detection device comprises an overturning plate rotationally arranged at the top of a water tank, and a plurality of containing devices for containing test pieces are arranged on the overturning plate at equal intervals; the supporting frame is arranged on the outer wall of the rear side of the water tank, a flat plate rotating shaft is rotationally arranged on the supporting frame, and a measuring mechanism is arranged on the flat plate rotating shaft and used for measuring thickness data of multiple point positions before the test piece is soaked in water and thickness data of the multiple point positions after the test piece is soaked in water; and the control system is arranged on the water tank and is in control connection with the measuring mechanism. According to the invention, except that the test piece needs to be manually placed, other operations are all automatically completed, so that the detection efficiency is high, and the detection consistency is also ensured. And during thickness measurement, multi-point measurement is adopted no matter before water absorption or after water absorption, so that the detection effect is ensured. In addition, the water absorption expansion test can be performed on a plurality of test pieces simultaneously.

Description

Technical Field

[0001] The present invention relates to the field of detection technology, and in particular to a device and method for detecting the water absorption expansion rate of a regenerated fiberboard. Background Art

[0002] As a new material that has emerged in recent years in building decoration, recycled fiberboard has been increasingly used due to its heat insulation, sound insulation, anti-static and other properties. The most important thing is its environmental protection characteristics. The use of a more natural manufacturing process can achieve unlimited durability of the material itself. It is mostly used in building decoration. The water absorption and expansion rate test of recycled fiberboard is an important indicator for evaluating its dimensional stability in a humid environment. The water absorption and expansion rate test process is roughly as follows: first prepare the test piece and the water tank and measure the thickness of the test piece, then place the test piece flat in the water, and a certain limiting structure is required to make the test piece completely immersed in the water. After a period of time (usually 24 hours), take out the test piece, wipe off the water at the measuring point, and measure the thickness of the original measuring point for a second time within ten minutes. The water absorption and expansion rate is calculated by the numerical value of the thickness before and after.

[0003] Chinese patent with announcement number CN213364537U discloses a water absorption expansion rate detection device for medium and high density fiberboard, which realizes the lateral and longitudinal movement of the measuring rod and ensures the accuracy of the measurement result.

[0004] However, the above-mentioned publicly available solutions have the following shortcomings: it is not convenient to carry out water absorption expansion rate tests on multiple specimens at the same time, and the entire process requires manual operation, which is inefficient and difficult to ensure detection consistency. Summary of the invention

[0005] The purpose of the present invention is to propose a device and method for detecting the water absorption expansion rate of recycled fiberboard in order to solve the problems in the background technology that it is difficult to carry out water absorption expansion rate tests on multiple specimens at the same time, and the test efficiency is low due to manual operation and it is difficult to ensure consistency.

[0006] In one aspect, the present invention provides a device for detecting water absorption expansion rate of a regenerated fiberboard, comprising a water tank and a plurality of test pieces; and further comprising:

[0007] A flip plate is rotatably arranged on the top of the water tank, and a plurality of accommodating devices for accommodating the test pieces are equidistantly arranged on the flip plate. The accommodating devices can be opened to take and place the test pieces, and sponge avoidance grooves are arranged on both sides of the accommodating devices;

[0008] The support frame is arranged on the outer wall of the rear side of the water tank, a flat plate rotating shaft is rotatably arranged on the support frame, and a measuring mechanism is arranged on the flat plate rotating shaft to measure the thickness data of multiple points of the test piece before immersion in water, and the thickness data of multiple points of the test piece after immersion in water. The flat plate rotating shaft drives the measuring mechanism to flip backward 90 degrees to release the rotation restriction of the flip plate;

[0009] And a control system, the control system is arranged on the water tank, and the control system is controlled and connected with the measuring mechanism.

[0010] Preferably, two support plates are arranged on the top right side of the water tank, and a flip plate shaft is arranged on the two support plates for longitudinal rotation, the flip plates are connected to the flip plate shaft, and a flip motor is arranged on the support plates.

[0011] Preferably, the accommodating device includes a specimen box vertically arranged on the flip plate, and a cover plate slidably arranged on the flip plate; the specimen is placed vertically in the specimen box, and a plurality of elastic members are arranged on the cross section of the cover plate facing the specimen box. During measurement, the elastic members press against the specimen, and when the specimen is immersed in water, the cover plate drives the elastic members to separate from the specimen by a set distance, and sponge avoidance grooves are arranged on both the specimen box and the cover plate.

[0012] Preferably, a motor mounting seat is provided on the flip plate, a screw motor a is provided on the motor mounting seat, a screw is rotatably provided on the flip plate, an end of the screw is connected to an output shaft of the screw motor a, and threaded holes for the screw to pass through are provided on multiple cover plates.

[0013] Preferably, a motor mounting frame is arranged on the support frame, a gear motor is arranged on the motor mounting frame, gears are arranged on the gear motor and the flat plate rotating shaft, and the two gears are meshed.

[0014] Preferably, the measuring mechanism includes a flat plate arranged transversely on the flat plate rotating shaft, a slide plate arranged on the flat plate and capable of approaching and moving away from each other, a sponge is arranged on the cross-section of the slide plate facing the accommodating device, a through hole is arranged at the center of the sponge, a distance measuring device is arranged on the end surface of the slide plate facing the accommodating device, the distance measuring device is located in the through hole, and the slide plates are arranged in groups of two, and the two slide plates in a group are respectively located on both sides of the accommodating device.

[0015] Preferably, a fixed plate is provided on the flat plate, and a plurality of coaxially connected double-threaded screws are rotatably provided on the fixed plate, the double-threaded screws have external threads with opposite thread directions at both ends, and two slide plates in a group are respectively provided with threaded holes matching the two external threads in opposite directions, a screw motor b is provided on the fixed plate, and the output shaft of the screw motor b is coaxially connected to the double-threaded screw.

[0016] On the other hand, the present invention provides a method for detecting the water absorption expansion rate of a regenerated fiberboard, comprising the following steps:

[0017] S1. Place the test piece in the containing device;

[0018] S2. Measure the initial thickness of the specimen by means of a measuring mechanism, and select a plurality of measuring points by means of the rotation of the plate shaft;

[0019] S3, turn the flip plate counterclockwise 90 degrees to immerse the containing device and the test piece in water for a set time;

[0020] S4, the flip plate flips clockwise by 90 degrees, and the measuring mechanism measures the thickness of the test piece after water absorption. Similarly, multiple measuring points are selected by rotating the plate shaft to calculate the water absorption expansion rate of the test piece;

[0021] S5. The plate axis flips backward to flip the measuring mechanism backward, the flip plate continues to flip 180 degrees clockwise, the containing device opens to automatically discharge the specimen, and the flip plate rotates 180 degrees in the opposite direction to reset.

[0022] Compared with the prior art, the present invention has the following beneficial technical effects: except for the manual operation of inserting the test piece, all other operations are completed automatically, the detection efficiency is high, and the consistency of the detection is guaranteed. When measuring the thickness, multi-point measurement is adopted both before and after water absorption to ensure the detection effect. In addition, water absorption and expansion tests can be carried out on multiple test pieces at the same time, and data can be compared. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 and Figure 2 Each of them is a stereogram of an embodiment of the present invention;

[0024] Figure 3 It is the structural diagram of the test organization;

[0025] Figure 4 It is a structural diagram of the measuring mechanism;

[0026] Figure 5 It is a schematic diagram of the immersion test;

[0027] Figure 6 Schematic diagram of automatic blanking of specimens.

[0028] Figure numerals: 1. water tank; 2. concave avoidance; 3. support plate; 4. flip plate shaft; 5. flip motor; 6. flip plate; 7. motor mounting seat; 8. screw motor a; 9. screw; 10. specimen box; 11. specimen; 12. cover plate; 13. sponge avoidance groove; 14. elastic member; 15. slide rail; 16. flat plate shaft; 17. support frame; 18. flat plate; 19. slide groove; 20. slide plate; 21. sponge seat; 22. sponge; 23. fixed plate; 24. double-threaded screw; 25. screw motor b; 26. gear motor; 27. gear; 28. motor mounting frame. DETAILED DESCRIPTION

[0029] Embodiment 1, as Figure 1-Figure 2 As shown, a device for detecting water absorption expansion rate of a regenerated fiberboard proposed by the present invention comprises a water tank 1 and a plurality of test pieces 11; and further comprises:

[0030] The flip plate 6 is rotatably arranged on the top of the water tank 1. A plurality of accommodating devices for accommodating the test piece 11 are equidistantly arranged on the flip plate 6. The accommodating devices can be opened to take and place the test piece 11. Sponge avoidance grooves 13 are arranged on both sides of the accommodating devices. The flip plate 6 is rotated 90 degrees counterclockwise to immerse the accommodating device and the test piece 11 in water. At this time, the test piece 11 is in a horizontal state. The flip plate 6 is rotated 180 degrees clockwise to discharge the material, and the test piece 11 can be automatically discharged from the accommodating device. The flip plate 6 and the related structures thereon, together with the structure that drives the flip plate 6 to rotate, are collectively referred to as a test mechanism. The right side of the water tank 1 Two support plates 3 are arranged on the top, and a flip plate shaft 4 is arranged on the two support plates 3 for longitudinal rotation. The flip plate 6 is connected to the flip plate shaft 4. A flip motor 5 is arranged on the support plate 3. The control system is connected to the flip motor 5. The flip motor 5 is an encoder motor that can accurately control the rotation angle. In an optional embodiment, the flip plate 6 includes a horizontal section and a vertical section. The vertical section is connected to the flip plate shaft 4. The horizontal section is used to install a receiving device. When the flip plate shaft 4 rotates counterclockwise by ninety degrees, the receiving device on the flip plate 6 is immersed in the water in the water tank 1 to perform a water absorption and expansion test.

[0031] A support frame 17 is arranged on the outer wall of the rear side of the water tank 1. A flat plate rotating shaft 16 is rotatably arranged on the support frame 17. A measuring mechanism is arranged on the flat plate rotating shaft 16 to measure the thickness data of multiple points of the test piece 11 before immersion in water, as well as the thickness data of multiple points after immersion in water. In addition, before measuring the thickness data after immersion in water, the water at the measuring points will be automatically wiped dry to ensure the measurement accuracy. The flat plate rotating shaft 16 drives the measuring mechanism to flip backward by ninety degrees to release the rotation restriction on the flip plate 6; a motor mounting frame 28 is arranged on the support frame 17, and a gear motor 26 is arranged on the motor mounting frame 28. Gears 27 are arranged on the gear motor 26 and the flat plate rotating shaft 16, and the two gears 27 are meshed; a control system is connected to the gear motor 26. In this embodiment, the gear motor 26 is an encoder motor that can accurately control the rotation angle, and is used to control the rotation angle of the flat plate rotating shaft 16 so that the measuring mechanism can enter and leave the measuring position;

[0032] And a control system, the control system is arranged on the water tank 1, and the control system is controlled and connected with the measuring mechanism.

[0033] Embodiment 2, as Figure 3 As shown, a device for detecting water absorption expansion rate of a regenerated fiberboard proposed by the present invention, compared with the first embodiment, this embodiment introduces the structure of the containing device in detail.

[0034] The accommodating device includes a specimen box 10 vertically arranged on the flip plate 6, and a cover plate 12 slidably arranged on the flip plate 6. Specifically, a slide rail 15 is arranged on the flip plate 6, and a slide groove for the slide rail 15 to pass through is arranged on the cover plate 12. The slide groove can be a dovetail groove or a T-shaped groove; the specimen 11 is vertically placed in the specimen box 10, and the internal space of the specimen box 10 needs to be larger than the size of the specimen 11 so that the specimen 11 can expand freely after being immersed in water. A plurality of elastic members 14 are arranged on the cross section of the cover plate 12 facing the specimen box 10. When measuring, the elastic members 14 The cover plate 12 pushes against the specimen 11. When the specimen 11 is immersed in water, the cover plate 12 drives the elastic member 14 to leave the specimen 11 by a set distance. The specimen box 10 and the cover plate 12 are both provided with a sponge avoidance groove 13. In this embodiment, when the specimen 11 is immersed in water, the distance between the elastic member 14 and the specimen 11 is half of the original thickness of the specimen 11. For a specimen 11 with a thickness of 5 mm, when the specimen 11 is immersed in water, the cover plate 12 drives the elastic member 14 to move 2.5 mm away from the specimen box 10, so that the specimen 11 can absorb water and expand freely without falling out of the specimen box 10. In an optional embodiment, the elastic member 14 includes a cylinder and a plug rod. The cylinder is provided on the cover plate 12. The plug rod is slidably provided on the inner wall of the cylinder. A spring is provided between the end of the plug rod and the cover plate 12. The spring is located in the cylinder. The other end of the plug rod contacts the specimen 11 or leaves the set distance.

[0035] Furthermore, a motor mounting seat 7 is provided on the flip plate 6, a screw motor a8 is provided on the motor mounting seat 7, a screw 9 is rotatably provided on the flip plate 6, the end of the screw 9 is connected to the output shaft of the screw motor a8, and a plurality of cover plates 12 are provided with threaded holes for the screw 9 to pass through; the screw motor a8 is an encoder motor, which can accurately control the rotation angle, thereby controlling the moving distance of the cover plate 12, and the control system is connected to the screw motor a8 control. In addition, when the flip plate is turned 270 degrees, the flip plate 6 is located on the right side outside the water tank 1, which is a blanking state, and is used to automatically discharge the test piece 11. At this time, the motor mounting seat 7 is located on the left side. In order to smoothly flip, an inner recessed avoidance 2 is provided on the right side of the water tank 1 for the motor mounting seat 7 to be inserted therein.

[0036] Embodiment three, as Figure 4 As shown, a device for detecting water absorption expansion rate of a regenerated fiberboard proposed by the present invention, compared with the first or second embodiment, this embodiment introduces the structure of the measuring mechanism in detail.

[0037] The measuring mechanism includes a flat plate 18 transversely arranged on the flat plate rotating shaft 16, a slide plate 20 arranged on the flat plate 18 and capable of approaching and moving away from each other, a sponge 22 is arranged on the cross-section of the slide plate 20 facing the accommodating device, a through hole is arranged at the center of the sponge 22, a distance measuring device is arranged on the end surface of the slide plate 20 facing the accommodating device, and the distance measuring device is located in the through hole, the slide plates 20 are arranged in groups of two, and the two slide plates 20 in a group are respectively located on both sides of the accommodating device; in an optional embodiment, a plurality of slide grooves 19 are transversely arranged on the flat plate 18, and a sliding block that is inserted into the slide groove 19 is arranged at the bottom of the slide plate 20. In this embodiment, since the elastic member 14 is provided on the cover plate 12, which is far away from the test piece 11, a sponge seat 21 is provided on the slide plate 20 on one side of the cover plate 12, and then a sponge 22 is provided on the sponge seat 21 to prevent the sponge 22 on this side from deforming and blocking the measuring point during the measurement process; when measuring the original thickness of the test piece 11, the two slide plates 20 are close to each other to a set distance, the elastic member 14 is against the test piece 11, and then the two distance measuring devices measure the distance from the surface of the test piece 11, and then the distance between the two slide plates 20 is calculated. When measuring the thickness, the flat plate shaft 16 rotates at multiple angles and takes multiple measuring points for measurement to improve the measurement accuracy. When measuring the thickness of the test piece 11 after being immersed in water, the two slides 20 approach each other to a set distance, and the elastic member 14 is against the surface of the test piece 11. The force applied by the elastic member 14 is not large and is only used to limit the test piece 11 to be in a vertical state. The sponge 22 contacts the two sides of the test piece 11. The flat plate shaft 16 rotates ten to twenty degrees, first wipes off a section of water with the sponge 22, and then rotates back in the opposite direction to take several points for measurement data, and finally calculates the thickness data after water absorption.

[0038] Furthermore, a fixed plate 23 is provided on the flat plate 18, and a plurality of coaxially connected double-threaded screws 24 are rotatably provided on the fixed plate 23. The double-threaded screw 24 has external threads with opposite thread directions at both ends. Two slide plates 20 in a group are respectively provided with threaded holes matching the external threads in opposite directions. A screw motor B25 is provided on the fixed plate 23, and an output shaft of the screw motor B25 is coaxially connected to the double-threaded screw 24. The control system is control-connected to the screw motor B25. The screw motor B25 is an encoder motor that can accurately control the rotation angle, so as to accurately control the position of the slide plate 20.

[0039] Embodiment 4, as Figure 5 and Figure 6 As shown, a method for detecting water absorption expansion rate of a regenerated fiberboard proposed by the present invention adopts the device for detecting water absorption expansion rate of a regenerated fiberboard of the fourth embodiment, and specifically comprises the following steps:

[0040] S1, placing the test piece 11 in a containing device;

[0041] S2, measuring the initial thickness of the test piece 11 by the measuring mechanism, and selecting a plurality of measuring points by the rotation of the flat plate rotating shaft 16;

[0042] S3, the flip plate 6 is rotated counterclockwise by 90 degrees to immerse the containing device and the test piece 11 in water for a set immersion time. According to the standard, the immersion time is 24 hours;

[0043] S4, the turning plate 6 turns clockwise by 90 degrees, and the measuring mechanism measures the thickness of the test piece 11 after water absorption. Similarly, multiple measuring points are selected by rotating the flat plate rotating shaft 16 to calculate the water absorption expansion rate of the test piece 11;

[0044] S5, the flat plate shaft 16 flips backward to flip the measuring mechanism backward, the flip plate 6 continues to flip 180 degrees clockwise, the accommodating device opens to automatically discharge the test piece 11, and the flip plate 6 rotates 180 degrees in the opposite direction to reset.

[0045] In summary, when the present invention is in use, in the initial state, the flip plate 6 is located above the water tank 1, the screw motor a8 controls the multiple cover plates 12 to move away from the specimen box 10, and then the specimen 11 is placed in the specimen box 10, the cover plate 12 moves back, and the elastic member 14 presses against the specimen 11, and then the slide plates 20 approach each other to a set distance, and the distance from the surface of the specimen 11 is measured by two distance measuring devices, and then the original thickness of the specimen 11 is calculated. Subsequently, the flip motor 5 drives the flip plate shaft 4 to rotate counterclockwise by 90 degrees, immersing the specimen box 10 and the specimen 11 in water, and the cover plate 12 is moved away for a distance to allow the specimen 11 to absorb water and expand freely, and the timing starts. After 24 hours, the flip plate 6 flips clockwise by 90 degrees to enter the initial position. At this time, the specimen 11 is removed from the water, and the screw motor b25 controls the slide plate 20 to approach each other to a set distance. At this time, the sponges 22 on both sides are attached to the specimen 11, and the flat plate shaft 16 first rotates an angle, and a dry surface is wiped out by the sponge 22, and then the flat plate shaft 16 rotates back in the opposite direction. In the process of rotating back, the distance measuring device selects several measuring points for distance measurement, and calculates the thickness after absorption, and then calculates the water absorption expansion rate. Next, the flat plate shaft 16 rotates more than ninety degrees, flips the slide plate 20 backward to pull a distance, and moves the slide plate 20 again close to the sponge 22 to squeeze the water on the sponge 22. For subsequent use, the flip plate 6 continues to flip one hundred and eighty degrees clockwise, the cover plate 12 is away from the specimen box 10, and the specimen 11 is discharged from the specimen box 10, completing the automatic discharge.

[0046] In the present invention, except for the manual operation of placing the test piece 11, all other operations are completed automatically, the detection efficiency is high, and the consistency of the detection is guaranteed. When measuring the thickness, multi-point measurement is adopted both before and after water absorption to ensure the detection effect. In addition, the water absorption expansion test can be performed on multiple test pieces 11 at the same time.

[0047] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto, and various changes can be made within the knowledge scope of technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A device for detecting water absorption expansion rate of recycled fiberboard, comprising a water tank (1) and a plurality of test pieces (11); characterized in that: Also includes: A flip plate (6) is rotatably arranged on the top of the water tank (1), and a plurality of accommodating devices for accommodating test pieces (11) are equidistantly arranged on the flip plate (6). The accommodating devices can be opened to take and place the test pieces (11), and sponge avoidance grooves (13) are arranged on both sides of the accommodating devices; A support frame (17) is arranged on the outer wall of the rear side of the water tank (1), a flat plate rotating shaft (16) is rotatably arranged on the support frame (17), and a measuring mechanism is arranged on the flat plate rotating shaft (16) for measuring the thickness data of multiple points of the test piece (11) before immersion in water and the thickness data of multiple points after immersion in water. The flat plate rotating shaft (16) drives the measuring mechanism to flip backwards by ninety degrees to release the rotation restriction of the flip plate (6); And a control system, which is arranged on the water tank (1) and is control-connected to the measuring mechanism.

2. The device for detecting water absorption expansion rate of regenerated fiberboard according to claim 1, characterized in that: Two support plates (3) are arranged on the top of the right side of the water tank (1), a flip plate rotating shaft (4) is arranged on the two support plates (3) to rotate in the longitudinal direction, a flip plate (6) is connected to the flip plate rotating shaft (4), and a flip motor (5) is arranged on the support plate (3).

3. The device for detecting water absorption expansion rate of regenerated fiberboard according to claim 1, characterized in that: The accommodating device comprises a specimen box (10) vertically arranged on a flip plate (6), and a cover plate (12) slidably arranged on the flip plate (6); a specimen (11) is vertically placed in the specimen box (10), a plurality of elastic members (14) are arranged on the cross section of the cover plate (12) facing the specimen box (10), during measurement, the elastic members (14) abut against the specimen (11), when the specimen (11) is immersed in water, the cover plate (12) drives the elastic members (14) to separate from the specimen (11) by a set distance, and sponge avoidance grooves (13) are arranged on both the specimen box (10) and the cover plate (12).

4. The device for detecting water absorption expansion rate of regenerated fiberboard according to claim 3, characterized in that: A motor mounting seat (7) is arranged on the flip plate (6), a screw motor a (8) is arranged on the motor mounting seat (7), a screw rod (9) is rotatably arranged on the flip plate (6), an end of the screw rod (9) is connected to an output shaft of the screw motor a (8), and a plurality of cover plates (12) are all provided with threaded holes for the screw rod (9) to pass through.

5. The device for detecting water absorption expansion rate of regenerated fiberboard according to claim 1, characterized in that: A motor mounting frame (28) is arranged on the support frame (17), a gear motor (26) is arranged on the motor mounting frame (28), and a gear (27) is arranged on the gear motor (26) and the flat rotating shaft (16), and the two gears (27) are meshed.

6. The device for detecting water absorption expansion rate of regenerated fiberboard according to claim 1, characterized in that: The measuring mechanism comprises a flat plate (18) arranged transversely on a flat plate rotating shaft (16), a slide plate (20) arranged on the flat plate (18) and capable of moving closer to and farther from each other, a sponge (22) arranged on the cross section of the slide plate (20) facing the receiving device, a through hole arranged at the center of the sponge (22), a distance measuring device arranged on the end surface of the slide plate (20) facing the receiving device, the distance measuring device being located in the through hole, and the slide plates (20) being arranged in groups of two, and the two slide plates (20) in a group being respectively located on both sides of the receiving device.

7. The device for detecting water absorption expansion rate of regenerated fiberboard according to claim 6, characterized in that: A fixing plate (23) is arranged on the flat plate (18), and a plurality of coaxially connected double-threaded screws (24) are rotatably arranged on the fixing plate (23), and the double-threaded screws (24) have external threads at both ends with opposite thread directions, and two slide plates (20) in one group are respectively provided with threaded holes matching the two external threads in opposite directions, and a screw motor b (25) is arranged on the fixing plate (23), and the output shaft of the screw motor b (25) is coaxially connected with the double-threaded screw (24).

8. A method for detecting the water absorption expansion rate of a regenerated fiberboard, using the device for detecting the water absorption expansion rate of a regenerated fiberboard according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. placing the test piece (11) in a containing device; S2, measuring the initial thickness of the test piece (11) by means of a measuring mechanism, and selecting a plurality of measuring points by means of the rotation of the flat plate rotating shaft (16); S3, turning the flip plate (6) counterclockwise by 90 degrees to immerse the containing device and the test piece (11) in water for a set immersion time; S4, the turning plate (6) turns clockwise by 90 degrees, and the measuring mechanism measures the thickness of the test piece (11) after water absorption. Similarly, multiple measuring points are selected by rotating the flat plate rotating shaft (16), and the water absorption expansion rate of the test piece (11) is calculated; S5, the flat plate rotating shaft (16) flips backward to flip the measuring mechanism backward, the flip plate (6) continues to flip 180 degrees clockwise, the containing device opens to automatically discharge the test piece (11), and the flip plate (6) rotates 180 degrees in the opposite direction to reset.

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