A ceramic fiber paper break test mechanism

By designing a ceramic fiber paper folding test mechanism and utilizing motor drive and automatic feeding technology, the problem of low testing efficiency in existing technologies has been solved, and rapid and accurate testing of the folding resistance of ceramic fiber paper has been achieved.

CN120404448BActive Publication Date: 2026-06-09JIANGSU DALI ENERGY SAVING TECH CO LTD

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
JIANGSU DALI ENERGY SAVING TECH CO LTD
Filing Date
2025-05-06
Publication Date
2026-06-09

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Abstract

The application is suitable for the field of testing mechanism, and provides a ceramic fiber paper breaking test mechanism, which comprises a feeding channel, a material collecting channel and a base plate, a rectangular gap matched with the base plate is arranged between the feeding channel and the material collecting channel, the feeding channel, the material collecting channel and the base plate are fixedly arranged respectively, and a round paper sheet conveying mechanism is arranged in the middle of the feeding channel and the material collecting channel. In use, the edge of the round aluminum silicate fiber paper sheet is folded into many wrinkles in the gap between the pressing cylinder and the pressing inner container, at this time, the pressing motor drives the driving disc to rotate by a certain angle, then the inclined groove drives all the vertical pressing rods to move inward, all the vertical pressing rods, the expanding guide rod and the folding pressing rod move inward along with the expanding sliding block until the folding pressing rod is attached to the pressing inner container, the pipe shaft, the driving disc and the pressing disc are back and forth twisted by thirty degrees by the twisting motor, and all the wrinkles of the edge of the round aluminum silicate fiber paper sheet are back and forth rolled by the folding pressing rod.
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Description

Technical Field

[0001] This invention belongs to the field of testing mechanisms, and specifically relates to a ceramic fiber paper breakage testing mechanism. Background Technology

[0002] With the development of industrial technology, modern testing institutions have become increasingly sophisticated. Alumina silicate fiber is a type of ceramic fiber. Ceramic fiber paper is made from selected alumina silicate ceramic fiber cotton as the main raw material using a wet forming process. Ceramic fiber is used in fields such as heat insulation and sealing materials for high-temperature equipment. During the production process, the tear resistance of ceramic fiber paper needs to be tested.

[0003] Existing testing methods for ceramic fiber paper require repeated folding of the paper and observation of whether the thickness of the paper thins or breaks at the folds. Ceramic fiber paper usually needs to be folded hundreds or even thousands of times at the folds to observe whether the folds thin or break, and many experiments are required to accurately determine the tear resistance of ceramic fiber paper. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a ceramic fiber paper folding test mechanism. During use, the edge of the circular aluminosilicate fiber paper sheet folds into numerous wrinkles within the gap between the pressing cylinder and the inner pressing chamber. At this time, the pressing motor drives the drive disc to rotate at a certain angle, which in turn drives all the vertical pressure rods to move inwards. All the expansion guide rods and folding pressure rods move inwards along the expansion slider until the folding pressure rods adhere to the inner pressing chamber. Simultaneously, the torsion motor drives the tube shaft, drive disc, and pressing disc to rotate back and forth by thirty degrees. All the wrinkles on the edge of the circular aluminosilicate fiber paper sheet are then repeatedly crushed by the folding pressure rods, thereby solving the problems mentioned in the background art.

[0005] To solve the above problems, the present invention provides the following technical solution: a ceramic fiber paper breaking test mechanism, comprising a feeding channel, a receiving channel, and a base plate, wherein a rectangular gap matching the base plate is provided between the feeding channel and the receiving channel; the feeding channel, the receiving channel, and the base plate are respectively fixedly arranged; a circular paper sheet conveying mechanism is provided between the feeding channel and the receiving channel; a telescopic channel is provided in the middle of the base plate, and a pressing cylinder is slidably arranged inside the telescopic channel; a lifting mechanism matching the pressing cylinder is provided below the pressing cylinder; a cantilever arm is provided on the side wall of the base plate, and the top end of the cantilever arm is fixedly installed. The device includes a torsion motor with a surrounding shaft on its output shaft. A tubular shaft is fixedly mounted at the end of the surrounding shaft, with its axis coinciding with the axis of the torsion motor's output shaft. A drive disc is rotatably mounted at the top of the tubular shaft, and a pressing disc is fixedly mounted at its bottom. Six expansion sliders in a circular array are fixedly mounted on the top surface of the pressing disc. An expansion guide rod is slidably mounted inside each expansion slider, and a folding pressure rod is mounted at the bottom of the outer end of each expansion guide rod. A pressing inner liner is rotatably mounted at the bottom of the pressing disc and can be inserted into the pressing cylinder. The expansion guide rods are connected to a closing mechanism.

[0006] During use, the circular aluminum silicate fiber paper is pushed between the pressing cylinder and the pressing liner. The pressing cylinder is pushed up to fit the pressing liner. The exposed edges of the circular aluminum silicate fiber paper will fold into many wrinkles in the gap between the pressing cylinder and the pressing liner. At this time, all the expansion guide rods and folding pressure rods will move inwards in the expansion slider until the folding pressure rods fit against the pressing liner. At the same time, the torsion motor drives the tube shaft, drive plate, and pressing plate to rotate back and forth by 30 degrees. All the wrinkles on the edges of the circular aluminum silicate fiber paper will be rolled back and forth by the folding pressure rods. After thousands of folding and rolling, the staff can observe the thinning or breakage at the creases. After multiple tests, the physical properties of the aluminum silicate fiber paper's folding resistance can be determined.

[0007] Furthermore, the lifting mechanism includes a fixed frame at the bottom of the base plate, an electric push rod at the bottom of the fixed frame, and the bottom of the pressing cylinder is connected to the telescopic rod of the electric push rod.

[0008] When in use, the electric push rod drives the pressing cylinder to rise and fit the pressing inner liner. The edges of the circular aluminum silicate fiber paper will fold into many folds in the gap between the pressing cylinder and the pressing inner liner.

[0009] Furthermore, the circular paper sheet conveying mechanism includes a feeding roller rotatably disposed at the left end of the feeding channel, a winding roller rotatably disposed at the right end of the receiving channel, the winding roller being connected to the output shaft of a stepper motor, the outer side of the feeding roller pulling out the paper material and connecting it to the winding roller, a continuing channel matching the paper material being disposed in the middle of the feeding channel and the receiving channel, the paper material passing through the gap between the pressing inner liner and the pressing cylinder, and a circular paper sheet punching mechanism matching the paper material being disposed at the top end of the feeding channel.

[0010] When in use, the stepper motor drives the winding roller and pulls the paper material forward step by step. The paper material will be conveyed in the feeding channel and the receiving channel.

[0011] Furthermore, the circular paper sheet punching mechanism includes a support bridge at the top of the feeding channel, a hydraulic press at the top of the support bridge, a punching disc on the telescopic rod of the hydraulic press, a ring array of punching blades at the bottom of the punching disc, and a punching groove matching the punching blades on the top surface of the feeding channel.

[0012] During use, as the hydraulic press drives the punching disc and punching blade downwards, the punching blade inserts into the punching groove to cut the paper. The punching seam left on the paper will form a tear groove. When the pressing cylinder and the pressing inner liner intersect each other, the circular aluminum silicate fiber paper will break at the tear groove. This allows for automatic feeding to achieve multiple tests.

[0013] Furthermore, the closing mechanism includes a pressing motor fixedly installed inside the tube shaft, the driving disk is connected to the output shaft of the pressing motor, the side wall of the driving disk is provided with six annular array of inclined slots, and the top of the inner end of the expansion guide rod is provided with a vertical pressure rod, which is inserted into the interior of the inclined slot.

[0014] During use, the pressing motor drives the drive plate to rotate at a certain angle, which in turn drives all the vertical pressing rods to move inward. All the vertical pressing rods, expansion guide rods, and folding pressing rods will move inward on the expansion slider until the folding pressing rods fit against the pressing inner liner.

[0015] Furthermore, a circular shell is rotatably fitted onto the outer side of the folding pressure rod.

[0016] When in use, the round shell on the outside of the folding bar reduces the friction between it and the aluminum silicate fiber paper, which makes repeated folding operations smoother.

[0017] Furthermore, the bottom outer edge of the pressed inner liner is provided with a rounded chamfer, and the top inner edge of the pressed cylinder is provided with a mating rounded chamfer.

[0018] When in use, the bottom outer edge rounded chamfer of the press-fit inner liner and the top inner edge rounded chamfer of the press-fit cylinder can be more smoothly interlocked, which can prevent the press-fit inner liner and the press-fit cylinder from shifting in the vertical direction.

[0019] Furthermore, the side wall of the pressing cylinder is provided with a ring-shaped array of vent holes.

[0020] When in use, as the inner liner and the pressing cylinder are interlocked, excess air inside the pressing cylinder will be expelled through the vent.

[0021] Compared with the prior art, the embodiments of this application have the following main advantages:

[0022] Firstly, when using this device, the circular aluminosilicate fiber paper is pushed between the pressing cylinder and the pressing liner. The electric push rod drives the pressing cylinder to lift up and fit the pressing liner. The exposed edges of the circular aluminosilicate fiber paper will fold into many wrinkles in the gap between the pressing cylinder and the pressing liner. At this time, the pressing motor drives the drive plate to rotate at a certain angle, and then the inclined groove drives all the vertical pressure rods to move inward. All the vertical pressure rods, expansion guide rods, and folding pressure rods will move inward on the expansion slider until the folding pressure rods fit into the pressing liner. At the same time, the torsion motor drives the tube shaft, drive plate, and pressing plate to rotate back and forth by 30 degrees. All the wrinkles on the edges of the circular aluminosilicate fiber paper will be rolled back and forth by the folding pressure rods. After thousands of folding and rolling, the staff can observe the thinning or breakage at the creases. After multiple tests, the physical properties of the aluminosilicate fiber paper's folding resistance can be determined.

[0023] Secondly, the stepper motor drives the winding roller and pulls the paper material forward step by step. As the hydraulic press drives the punching disc and punching blade downward, the punching blade inserts into the punching groove to cut. The punching seam left on the paper material will form a tearing groove. When the pressing cylinder and the pressing inner liner intersect each other, the circular aluminum silicate fiber paper will break at the tearing groove. This allows for automatic feeding to achieve multiple tests. Attached Figure Description

[0024] Figure 1 This is a frontal view of the present invention.

[0025] Figure 2 This is a schematic diagram of the punching disc of the present invention.

[0026] Figure 3 This is a schematic diagram of the base plate of the present invention.

[0027] Figure 4 This is a schematic diagram of the base plate of the present invention from a second perspective.

[0028] Figure 5This is a schematic diagram of the press-fit inner liner of the present invention.

[0029] Figure 6 This is a schematic diagram of the expansion guide rod of the present invention.

[0030] Explanation of reference numerals in the attached figures:

[0031] Feeding channel 1, receiving channel 101, feeding roller 102, winding roller 103, paper material 104, stepper motor 105, base plate 2, support bridge 3, hydraulic press 301, punching disc 302, punching knife 303, punching groove 304, cantilever arm 4, torsion motor 401, wrapping shaft 402, drive disc 5, inclined groove 501, pressing inner liner 6, pressing disc 601, expansion guide rod 602, expansion slider 603, vertical pressure rod 604, folding pressure rod 605, fixed frame 7, electric push rod 701, pressing cylinder 702, vent hole 703, pressing motor 8, tube shaft 801. Detailed Implementation

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings of this application are used to distinguish different objects, not to describe a particular order.

[0033] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0034] This invention provides a ceramic fiber paper breakage testing mechanism, such as... Figure 1-6As shown, the system includes a feeding channel 1, a receiving channel 101, and a base plate 2. A rectangular gap matching the base plate 2 is provided between the feeding channel 1 and the receiving channel 101. The feeding channel 1, the receiving channel 101, and the base plate 2 are fixedly installed. A circular paper sheet conveying mechanism is provided between the feeding channel 1 and the receiving channel 101. A telescopic channel is provided in the middle of the base plate 2. A pressing cylinder 702 is slidably installed inside the telescopic channel. A lifting mechanism matching the pressing cylinder 702 is provided below the pressing cylinder 702. A cantilever arm 4 is provided on the side wall of the base plate 2. A torsion motor 401 is fixedly installed at the top of the cantilever arm 4. A circumferential shaft is provided on the output shaft of the torsion motor 401. 402, a tube shaft 801 is fixedly installed at the end of the surrounding shaft 402, and the axis of the tube shaft 801 coincides with the axis of the output shaft of the torsion motor 401; a drive disk 5 is rotatably installed at the top of the tube shaft 801, and a pressing disk 601 is fixedly installed at the bottom of the tube shaft 801. Six expansion sliders 603 in a ring array are fixedly installed on the top surface of the pressing disk 601. An expansion guide rod 602 is slidably installed inside each expansion slider 603. A folding pressure rod 605 is provided at the bottom of the outer end of the expansion guide rod 602. A pressing inner liner 6 is rotatably installed at the bottom of the pressing disk 601. The pressing inner liner 6 can be inserted into the inside of the pressing cylinder 702; the expansion guide rod 602 is connected to the closing mechanism.

[0035] In this embodiment, the circular aluminum silicate fiber paper is pushed between the pressing cylinder 702 and the pressing inner liner 6. The pressing cylinder 702 is pushed upwards to fit the pressing inner liner 6. The exposed edges of the circular aluminum silicate fiber paper will fold into many wrinkles in the gap between the pressing cylinder 702 and the pressing inner liner 6. At this time, all the expansion guide rods 602 and folding pressure rods 605 will move inwards in the expansion slider 603 until the folding pressure rods 605 are in contact with the pressing inner liner 6. At the same time, the torsion motor 401 drives the tube shaft 801, the drive disk 5, and the pressing disk 601 to rotate back and forth by thirty degrees. All the wrinkles on the edges of the circular aluminum silicate fiber paper will be rolled back and forth by the folding pressure rods. After thousands of folding and rolling, the workers can observe the thinning or breakage at the creases. After multiple tests, the physical properties of the aluminum silicate fiber paper's folding resistance can be determined.

[0036] In further embodiments of the present invention, such as Figure 1-4 As shown, the lifting mechanism includes a fixed frame 7 at the bottom of the base plate 2, an electric push rod 701 is provided at the bottom of the fixed frame 7, and the bottom of the pressing cylinder 702 is connected to the telescopic rod of the electric push rod 701.

[0037] In this embodiment, the electric push rod 701 drives the pressing cylinder 702 to rise and fit the pressing inner liner 6. The edge of the circular aluminum silicate fiber paper will fold into many folds in the gap between the pressing cylinder 702 and the pressing inner liner 6.

[0038] In further embodiments of the present invention, such as Figure 1-2 As shown, the circular paper sheet conveying mechanism includes a feeding roller 102 rotatably disposed at the left end of the feeding channel 1, and a winding roller 103 rotatably disposed at the right end of the receiving channel 101. The winding roller 103 is connected to the output shaft of the stepper motor 105. The outer side of the feeding roller 102 pulls out the paper material 104 and connects it to the winding roller 103. A feeding channel matching the paper material 104 is disposed in the middle of the feeding channel 1 and the receiving channel 101. The paper material 104 passes through the gap between the pressing inner liner 6 and the pressing cylinder 702. A circular paper sheet punching mechanism matching the paper material 104 is disposed at the top of the feeding channel 1.

[0039] In this embodiment, the stepper motor 105 drives the take-up roller 103 and pulls the paper material 104 forward step by step. The paper material 104 will be conveyed in the feeding channel 1 and the take-up channel 101.

[0040] In further embodiments of the present invention, such as Figure 1-2 As shown, the circular paper punching mechanism includes a support bridge 3 at the top of the feeding channel 1, a hydraulic press 301 at the top of the support bridge 3, a punching disc 302 on the telescopic rod of the hydraulic press 301, a ring array of punching blades 303 at the bottom of the punching disc 302, and a punching groove 304 matching the punching blades 303 on the top surface of the feeding channel 1.

[0041] In this embodiment, as the hydraulic press 301 drives the punching disc 302 and the punching blade 303 downward, the punching blade 303 inserts into the punching groove 304 to cut, and the punching seam left on the paper material 104 will form a tear groove. When the pressing cylinder 702 and the pressing inner liner 6 intersect each other, the circular aluminum silicate fiber paper will break at the tear groove. This allows for automatic feeding to achieve multiple tests.

[0042] In further embodiments of the present invention, such as Figure 1-6 As shown, the closing mechanism includes a pressing motor 8 fixedly installed inside the tube shaft 801, and the driving disk 5 is connected to the output shaft of the pressing motor 8. The side wall of the driving disk 5 is provided with six annular arrays of inclined grooves 501. The top of the inner end of the expansion guide rod 602 is provided with a vertical pressure rod 604, and the vertical pressure rod 604 is inserted into the interior of the inclined groove 501.

[0043] In this embodiment, the pressing motor 8 drives the drive disk 5 to rotate at a certain angle, and then the inclined groove 501 drives all the vertical pressing rods 604 to move inward. All the vertical pressing rods 604, expansion guide rods 602, and folding pressing rods 605 will move inward in the expansion slider 603 until the folding pressing rods 605 fit against the pressing inner liner 6.

[0044] In further embodiments of the present invention, such as Figure 5-6 As shown, a circular shell is rotatably fitted on the outer side of the folding pressure rod 605.

[0045] In this embodiment, the circular shell on the outside of the folding pressure bar 605 reduces the friction between it and the aluminum silicate fiber paper, which makes repeated folding operations smoother.

[0046] In further embodiments of the present invention, such as Figure 5-6 As shown, the bottom outer edge of the pressed inner liner 6 is provided with a rounded chamfer, and the top inner edge of the pressed cylinder 702 is provided with a mating rounded chamfer.

[0047] In this embodiment, the bottom outer edge chamfer of the press-fit inner liner 6 and the top inner edge chamfer of the press-fit cylinder can be more smoothly interlocked, which can prevent the press-fit inner liner 6 and the press-fit cylinder 702 from shifting in the vertical direction.

[0048] In further embodiments of the present invention, such as Figure 1-4 As shown, the side wall of the pressing cylinder 702 is provided with an annular array of vent holes 703.

[0049] In this embodiment, when the inner liner 6 and the pressing cylinder 702 are interlocked, excess air inside the pressing cylinder 702 will be discharged through the vent hole 703.

[0050] It should be noted that, for the sake of simplicity, the foregoing embodiments are all described as a series of actions. However, those skilled in the art should understand that the present invention is not limited to the described order of actions, as some steps may be performed in other orders or simultaneously according to the present invention. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to the present invention.

[0051] It should be understood that the disclosed apparatus can be implemented in other ways, given the several embodiments provided in this application. For example, the apparatus embodiments described above are merely illustrative. For instance, the division of units described above may be implemented in other ways in practice. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or communication connections shown or discussed may be through some interfaces; indirect coupling or communication connections between devices or units may be telecommunications or other forms.

[0052] The units described above as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0053] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the scope of protection of the invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on these embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can still combine, add, delete, or otherwise adjust the features of the various embodiments of the present invention according to the circumstances without conflict or creative effort, thereby obtaining different technical solutions that do not fundamentally depart from the concept of the present invention. These technical solutions also fall within the scope of protection of the present invention.

Claims

1. A ceramic fiber paper breaking test mechanism, characterized in that: It includes a feeding channel (1), a receiving channel (101) and a base plate (2). A rectangular gap matching the base plate (2) is provided between the feeding channel (1) and the receiving channel (101). The feeding channel (1), the receiving channel (101) and the base plate (2) are fixedly set respectively. A circular paper sheet conveying mechanism is provided in the middle of the feeding channel (1) and the receiving channel (101). The base plate (2) has a telescopic channel in the middle, and a pressing cylinder (702) is slidably arranged inside the telescopic channel. A lifting mechanism matching the pressing cylinder (702) is arranged below the pressing cylinder (702). A cantilever arm (4) is provided on the side wall of the base plate (2). A torsion motor (401) is fixedly installed at the top of the cantilever arm (4). A surrounding shaft (402) is provided on the output shaft of the torsion motor (401). A tube shaft (801) is fixedly installed at the end of the surrounding shaft (402). The axis of the tube shaft (801) coincides with the axis of the output shaft of the torsion motor (401). A drive disk (5) is rotatably provided at the top end of the tube shaft (801), and a pressing disk (601) is fixedly provided at the bottom end of the tube shaft (801). Six expansion sliders (603) in a ring array are fixedly provided on the top surface of the pressing disk (601). An expansion guide rod (602) is slidably installed inside each expansion slider (603). A folding pressure rod (605) is provided at the bottom of the outer end of the expansion guide rod (602). A pressing inner liner (6) is rotatably provided at the bottom of the pressing disk (601). The pressing inner liner (6) can be inserted into the inside of the pressing cylinder (702). The expansion guide rod (602) is connected to the closing mechanism.

2. The ceramic fiber paper breaking test mechanism according to claim 1, characterized in that: The lifting mechanism includes a fixed frame (7) at the bottom of the base plate (2), and an electric push rod (701) is provided at the bottom of the fixed frame (7). The bottom of the pressing cylinder (702) is connected to the telescopic rod of the electric push rod (701).

3. The ceramic fiber paper breaking test mechanism according to claim 1, characterized in that: The circular paper sheet conveying mechanism includes a feeding roller (102) rotatably disposed at the left end of the feeding channel (1), and a winding roller (103) rotatably disposed at the right end of the receiving channel (101). The winding roller (103) is connected to the output shaft of the stepper motor (105). The outer side of the feeding roller (102) pulls out the paper material (104) and connects it to the winding roller (103). A feeding channel matching the paper material (104) is disposed in the middle between the feeding channel (1) and the receiving channel (101). The paper material (104) passes through the gap between the pressing inner liner (6) and the pressing cylinder (702). A circular paper sheet punching mechanism matching the paper material (104) is disposed at the top end of the feeding channel (1).

4. The ceramic fiber paper breaking test mechanism according to claim 3, characterized in that: The circular paper punching mechanism includes a support bridge (3) at the top of the feeding channel (1), a hydraulic press (301) is provided at the top of the support bridge (3), a punching disc (302) is provided on the telescopic rod of the hydraulic press (301), a ring array of punching blades (303) is provided at the bottom of the punching disc (302), and a punching groove (304) matching the punching blades (303) is provided on the top surface of the feeding channel (1).

5. The ceramic fiber paper breaking test mechanism according to claim 1, characterized in that: The closing mechanism includes a pressing motor (8) fixedly installed inside the tube shaft (801), and the driving disk (5) is connected to the output shaft of the pressing motor (8). The side wall of the driving disk (5) is provided with six annular array of inclined grooves (501). The top of the inner end of the expansion guide rod (602) is provided with a vertical pressure rod (604), and the vertical pressure rod (604) is inserted into the interior of the inclined groove (501).

6. The ceramic fiber paper breaking test mechanism according to claim 1, characterized in that: The outer side of the folding pressure bar (605) is fitted with a round shell.

7. The ceramic fiber paper breaking test mechanism according to claim 1, characterized in that: The bottom outer edge of the press-fit inner liner (6) is provided with a rounded chamfer, and the top inner edge of the press-fit cylinder (702) is provided with a mating rounded chamfer.

8. The ceramic fiber paper breaking test mechanism according to claim 1, characterized in that: The side wall of the pressing cylinder (702) is provided with an annular array of vent holes (703).