Material protection testing device

Abstract

The utility model relates to a material protection testing device. The material protection testing device comprises a fixed rack; the test mold is arranged on the fixed rack, is used for generating impact on the protective material sample, and comprises an impact bullet; the sample fixing assembly is arranged on the fixed rack, is arranged below the test mold, and is used for fixing the protective material sample and detecting the protective performance of the protective material sample; and the speed measuring assembly is arranged on the fixed rack and is used for measuring the falling speed of the test mold. The test mold can be repeatedly utilized, the test mold is suitable for protection tests of different materials through structural arrangement, and the impact bullet head with the same shape as the special bullet is adopted, so that the impact effect is close to that of the special bullet, and the effect of reducing the special bullet in a formal test is achieved; the test cost is reduced; and the formal test period is shortened.

Description

Technical Field

[0001] The present application relates to the technical field of product testing, and in particular to a material protection testing device. Background Art

[0002] The V50 test is a test method for quantitatively analyzing the protective capabilities of materials. By conducting a V50 test, the average impact velocity of simulated fragments or specific projectiles when the material penetration probability is 50% can be obtained, and the protective performance of materials can be compared through the different V50 velocities of each material.

[0003] In the conventional technology, it is generally necessary to perform at least six bullet impact tests on the test sample, and if the V50 velocity is not measured after six tests, it is necessary to perform multiple bullet impact tests to ensure that the V50 velocity can be measured.

[0004] However, with traditional technology, the bullets used in bullet impact tests are special bullets, which generally cost several times more than ordinary bullets, and the test cycle of the V50 test is relatively long, which leads to a higher test cost for the V50 test. Utility Model Content

[0005] Based on this, it is necessary to provide a material protection testing device that can shorten the test cycle and thus improve efficiency and reduce costs in response to the above technical problems.

[0006] In a first aspect, the present application provides a material protection testing device, comprising:

[0007] Fixed stand;

[0008] The test mold is placed on a fixed stand and is used to impact the protective material sample. The test mold includes an impact bullet. The impact bullet has the same shape as the V50 test characteristic bullet.

[0009] A sample fixing assembly is arranged on a fixed stand and placed below the test mold, and is used to fix the protective material sample and test the protective performance of the protective material sample;

[0010] The speed measuring component is placed on a fixed stand and is used to measure the falling speed of the test mold.

[0011] In one embodiment, the test mold comprises:

[0012] The round tube is connected with the impact bullet and the impact bullet is arranged at the bottom of the round tube, so as to enhance the impact strength of the impact bullet.

[0013] In one embodiment, the test mold further comprises:

[0014] A plurality of counterweight blocks are connected to the round tube and are used to adjust the impact strength of the impact warhead.

[0015] In one embodiment, the device further comprises:

[0016] A first fixing hole is provided on the side of the circular tube;

[0017] The counterweight block is provided with a connecting through hole and a second fixing hole, and the counterweight block is also provided with a fixing strip, and the connecting through hole and the second fixing hole are perpendicular to each other;

[0018] The counterweight block is sleeved on the round tube through the connecting through hole, and the fixing bar passes through the second fixing hole and is embedded in the first fixing hole.

[0019] In one embodiment, the device further comprises:

[0020] An isolation component is arranged between the sample fixing component and the test mold, and is used to stop the movement of the test mold after the impact bullet impacts the protective material sample, and includes an isolation fixing seat and an isolation plate, and the isolation plate is connected to the isolation fixing seat, and the connection method is a detachable connection;

[0021] The isolation plate is provided with an impact through hole, the diameter of which is larger than the diameter of the round tube and smaller than the maximum diameter of the cross section of the test mold.

[0022] In one embodiment, the device further comprises:

[0023] The clamping assembly is connected to the test mold and is used for fixing the test mold and releasing the test mold to allow the test mold to fall freely.

[0024] In one embodiment, the clamping assembly includes:

[0025] The electromagnetic acceleration component is connected to the round tube and is used to provide acceleration to the test mold to increase the impact strength of the test mold.

[0026] In one embodiment, the fixed stand comprises:

[0027] A fixed stand for supporting a sample fixing assembly;

[0028] A support plate, arranged above the fixed pedestal, for connecting the test mold;

[0029] The bracket is vertically arranged on the top of the fixed pedestal and connected to the support plate, and is used for fixing the support plate.

[0030] In one embodiment, the speed measuring assembly is disposed on a bracket, and the speed measuring assembly is provided with two speed measuring units, one speed measuring unit is at the same horizontal position as the starting position of the test mold, and the other speed measuring unit is at the same horizontal position as the protective material sample.

[0031] In one embodiment, the sample fixing assembly includes a sample fixing frame, and the protective material sample is connected to the sample fixing frame in a detachable manner.

[0032] In the above-mentioned material protection test device, the protective material sample is fixedly mounted on the sample fixing component, and then the test mold is placed directly above the protective material sample and temporarily fixed by a fixed stand. After that, when the test is carried out, the test mold is released so that the test mold impacts the protective material sample in a free fall manner. While releasing the test mold, the speed of the test mold is measured using the speed measuring component to determine the speed of the impact bullet. After each impact, the number of impacts of the test mold is recorded, and parameters such as the impact depth of the protective material sample are obtained until the protective material sample is penetrated, and then the simulated V50 speed can be calculated based on the recorded relevant data. Through the above-mentioned material protection test device, the test mold can be reused and the structural setting can be used for protection tests of different materials, and the impact bullet with the same shape as the special bullet is used, so that the impact effect is close to the special bullet, so as to achieve the effect of reducing the special bullet during the formal test, reducing the test cost and shortening the formal test cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the related technical descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] FIG1 is a schematic structural diagram of a material protection testing device in one embodiment;

[0035] FIG2 is a schematic front view of the structure of a circular tube in one embodiment;

[0036] FIG3 is a schematic front view of the structure of a counterweight block in one embodiment;

[0037] FIG4 is a schematic top view of the structure of an isolation assembly in one embodiment;

[0038] FIG. 5 is a schematic front view of the structure of a sample fixing assembly in one embodiment.

[0039] Description of reference numerals:

[0040] 10. Fixed stand; 20. Test mold; 30. Sample fixing assembly; 40. Speed ​​measuring assembly; 50. Isolation assembly; 60. Electromagnetic acceleration assembly;

[0041] 110, fixed base; 120, support plate; 130, bracket;

[0042] 210, impact bullet; 220, round tube; 230, counterweight;

[0043] 221, first fixing hole;

[0044] 231, second fixing hole;

[0045] 310. Protective material sample; 320. Sample holder;

[0046] 410, speed measuring unit;

[0047] 510, isolation fixing seat; 520, isolation plate; 530, impact through hole. DETAILED DESCRIPTION

[0048] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0049] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0050] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0051] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0052] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0053] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0054] Referring to FIG. 1 , FIG. 1 shows a schematic diagram of the structure of a material protection test device in one embodiment of the utility model. The material protection test device provided by one embodiment of the utility model includes a fixed stand 10, a test mold 20, a sample fixing assembly 30 and a speed measuring assembly 40. The test mold 20 is used to impact a protective material sample 310, the test mold 20 includes an impact bullet 210, and the speed measuring assembly 40 is used to measure the falling speed of the test mold 40. The impact bullet 210 has the same shape as the V50 test characteristic bullet. The sample fixing assembly 30 is arranged on the fixed stand 10, the sample fixing assembly 30 is placed directly below the test mold 20, and the protective material sample 310 is fixedly arranged on the sample fixing assembly 30. When it is necessary to perform a protection test on the protective material sample 310, the test mold 20 is controlled to be separated from the fixed stand 10, and the test mold 20 approaches the sample fixing assembly 30 in a free-falling manner until the impact bullet 210 of the test mold 20 impacts. During each impact test, the speed measuring assembly 40 is used to measure the speed of the test mold 20 during the impact test, and then the protective material sample 310 after the impact is monitored to obtain relevant parameters of the impact test.

[0055] Specifically, the sample fixing assembly 30 is arranged on the base of the fixed stand 10, and the fixed stand 10 places the test mold 20 above the sample fixing assembly 30. Optionally, the material protection testing device is configured with a control system. Optionally, the fixed stand 10 can be provided with a support assembly, and a release unit is provided on the support assembly, and the release unit is communicatively connected with the control system. At the same time, the release unit is connected to the test mold 20 and the connection method is a detachable connection. Therefore, during the material protection test, the release unit is separated from the test mold 20 by controlling the control system, and the test mold 20 causes an impact on the protective material sample 310 on the sample fixing assembly 30 in a free fall manner based on gravity.

[0056] In the above-mentioned material protection test device, the protective material sample is fixedly mounted on the sample fixing component, and then the test mold is placed directly above the protective material sample and temporarily fixed by a fixed stand. After that, when the test is carried out, the test mold is released so that the test mold impacts the protective material sample in a free fall manner. While releasing the test mold, the speed of the test mold is measured using the speed measuring component to determine the speed of the impact bullet. After each impact, the number of impacts of the test mold is recorded and parameters such as the impact depth of the protective material sample are obtained until the protective material sample is penetrated, and then the simulated V50 speed can be calculated based on the recorded relevant data. Through the above-mentioned material protection test device, the test mold can be reused and the structural setting can be used for protection tests of different materials, and the impact bullet with the same shape as the special bullet is used, so that the impact effect is close to the special bullet, so as to achieve the effect of reducing the special bullet during the formal test, reducing the test cost and shortening the formal test cycle.

[0057] 1 , in an exemplary embodiment, the test mold 20 includes a round tube 220, and the round tube 220 is used to enhance the impact strength of the impact bullet 210. The round tube 220 is connected to the impact bullet 210, and the impact bullet is placed at the bottom of the round tube 220.

[0058] Specifically, in order to test the effect, the impact bullet 210 generally needs to be specially customized to simulate the shape of the V50 idiosyncratic bullet. Optionally, the impact bullet 210 is made into a projectile of a specific weight and a specific diameter. However, due to the weight of the impact bullet 210 itself, the free-falling impact bullet 210 cannot cause an effective impact on the protective material sample 310. The impact bullet 210 is placed at the bottom of the round tube 220 to increase the impact strength by increasing the mass. In this embodiment, since the impact bullet 210 is specially customized, and the shape of the impact bullet 210 is the same as that of the V50 idiosyncratic bullet, the impact effect of simulating the V50 idiosyncratic bullet can be achieved. And compared with the V50 idiosyncratic bullet, the impact bullet 210 is simpler to make, so that the test cost can be reduced in the test of the material protection performance, and the test cycle can be shortened because the impact bullet 210 is simple to make.

[0059] 1 , in an exemplary embodiment, the test mold 20 further includes a plurality of weight blocks 230, and the weight blocks 230 are used to adjust the impact strength of the impact bullet 210. Each weight block 230 is connected to the round tube 220, and the connection method is a detachable connection.

[0060] Specifically, when performing the protection test, the protective effect of the components of the protective material sample 310 can be roughly determined, and then different numbers and sizes of counterweights 230 can be selected for use in combination with the circular tube 220. Optionally, the counterweights 230 can be fixed on the side of the circular tube 220 in a uniformly spaced manner. In this embodiment, the number of counterweights 230 set on the side of the circular tube 220 is adjusted based on the protective material samples 310 with different protective effects to adjust the impact strength of the test mold 20.

[0061] Referring to FIG. 2 and FIG. 3 at the same time, FIG. 2 shows a schematic front view of the structure of a circular tube in an embodiment, and FIG. 3 shows a schematic front view of the structure of a counterweight in an embodiment. In an exemplary embodiment, the counterweight 230 is sleeved on the circular tube 220. The circular tube 220 is provided with first fixing holes 221 evenly spaced in the axial direction, and the counterweight is provided with a connecting through hole and a second fixing hole 231 penetrating therethrough, wherein the connecting through hole and the second fixing hole 231 are perpendicular to each other. At the same time, the counterweight 230 is also provided with a fixing strip in the second fixing hole 231.

[0062] Specifically, when adjusting the impact strength of the test mold 20, take increasing the impact strength as an example. The end of the round tube 220 is embedded in the connecting through hole of the counterweight block 230, and the counterweight block 230 is moved along the axial direction of the round tube 220 until the second fixing hole 231 of the counterweight block 230 is aligned with the first fixing hole 221 of the round tube 220, and then the fixing bar in the second fixing hole 231 is pushed to be embedded in the first fixing hole 221. Optionally, the fixing bar is interference fit with the first fixing hole 221. Optionally, the fixing bar can adopt a screw structure, and the first fixing hole 221 and the second fixing hole 231 both adopt a threaded structure.

[0063] Continuing to refer to FIG. 1 , the material protection test device further includes an isolation assembly 50, which is used to stop the movement of the test mold 20 after the impact bullet 210 impacts the protective material sample 310. The isolation assembly includes an isolation fixing seat 510 and an isolation plate 520, wherein the isolation plate 520 is fixed on the isolation fixing seat 510, and the isolation plate 520 is connected to the isolation fixing seat 510 in a detachable connection manner. Referring to FIG. 4 , FIG. 4 shows a schematic diagram of a top view of the structure of the isolation assembly in an embodiment. In an exemplary embodiment, the isolation plate 520 is a square structure, and the four corners of the isolation plate 520 are fixed by the isolation fixing seat 510, for example, by a snap-fit ​​structure. The isolation plate 520 is provided with an impact through hole 530. Optionally, the impact through hole 530 is a circular hole. Based on the function of the isolation assembly 50, the diameter of the impact through hole 530 is greater than the diameter of the round tube, and the diameter of the impact through hole 530 is less than the maximum diameter of the cross section of the test mold 20.

[0064] Continuing to refer to FIG. 1, after the impact strength is increased by the counterweight 230, if the impact strength still cannot reach the protective effect of the test protective material sample 310, it is necessary to contact the external force to increase the initial falling speed of the test mold. In an exemplary embodiment, the material protection test device also includes an electromagnetic acceleration component 60, which is connected to the round tube 220. The electromagnetic acceleration component 60 is used to provide acceleration to the test mold 20 to increase the impact strength of the test mold 20. The working principle of the electromagnetic acceleration component 60 is to generate a magnetic field through an electric current, and then use this magnetic field to apply force to the object to achieve the purpose of acceleration. Optionally, the electromagnetic acceleration component 60 can use a coil accelerator. Among them, the coil accelerator usually includes a plurality of coils, which work together to provide a continuous acceleration effect. When current is passed through the coil, they attract magnetic materials, such as iron, cobalt, nickel, etc., and accelerate the object in this way. In order to maintain the acceleration effect, the shell needs to pass through the coil multiple times, and each time it passes through the coil, it will be accelerated once. At the same time, different acceleration effects can be achieved by adjusting the number and position of the coils.

[0065] Continuing to refer to FIG. 1 , in an exemplary embodiment, the fixed stand 10 includes a fixed stand 110, a support plate 120 and a bracket 130, wherein the support plate 120 is used to connect the test mold 20, the bracket 130 is perpendicular to the top of the fixed stand 110 and is arranged on the edge of the fixed stand 110, and the top of the bracket 130 is connected to the support plate 120. Optionally, a clamping assembly is provided on the support plate 120, and the clamping assembly is used to fix the test mold 20 and release the test mold 20 to allow it to fall freely.

[0066] Continuing to refer to 1, in an exemplary embodiment, the speed measuring assembly 4 is provided with two speed measuring units 410, and the two speed measuring units 410 are used in combination to measure the speed of the test mold 20 during the impact test. Both speed measuring units 410 are arranged on the bracket 130, and the two speed measuring units are respectively arranged at the release height of the test mold 20 and the height at which the test mold 20 impacts the protective material sample 310. That is, one speed measuring unit 410 is at the same horizontal position as the starting position of the test mold 20, and the other speed measuring unit 410 is at the same horizontal position as the protective material sample 310. The speed measuring assembly can select radar speed measurement or laser speed measurement.

[0067] Among them, radar speed measurement uses the Doppler effect. When an object (such as a vehicle) moves at a speed relative to the radar, it sends an echo to the radar. The radar receives these echoes and determines the speed of the object by comparing the time difference between the transmitted and received signals. If the object is stationary, the frequency of the reflected signal remains unchanged; conversely, if the object is moving, the frequency of the reflected signal will be lower than the frequency when it was transmitted. By calculating the change in this frequency, the speed of the object can be obtained.

[0068] Laser speed measurement technology is based on the time-distance principle. The speed measuring instrument emits a very narrow beam of light. When the beam hits an object, part of the beam is reflected back by the object. By measuring the round-trip time of the light and the knowledge of the speed of light, the distance between the object and the speed meter can be calculated, and then the speed of the object can be calculated based on the change in time. Laser speed measurement technology is generally used for short-distance and low-speed speed measurement.

[0069] The speed measuring unit 410 may be a light sensor, that is, the speed measuring assembly 40 uses the technical principle of laser speed measurement. When the speed measuring unit 410 located at the top is blocked by the impact bullet 210, the detection starts, and the speed measuring unit 410 located at the bottom is blocked by the impact bullet 210 and the detection ends, the speed of the test mold 20 can be obtained by calculation.

[0070] Meanwhile, referring to FIG5 , FIG5 shows a schematic front view of the structure of a sample fixing assembly in an embodiment, wherein the sample fixing assembly 30 includes a sample fixing frame 320, and the protective material sample 310 is connected to the sample fixing frame 320 in a detachable manner. Optionally, a buckle structure is provided on the sample fixing frame 320, and the protective material sample 310 is fixed by the buckle structure.

[0071] In the description of this specification, the descriptions with reference to the terms "some embodiments", "other embodiments", "ideal embodiments", etc., mean that the specific features, structures, materials, or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the utility model. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.

[0072] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0073] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A material protection testing device, characterized in that: include: Fixed stand (10); A test mold (20) is placed on the fixed stand (10) and is used to produce an impact on the protective material sample (310), wherein the test mold (20) comprises an impact bullet (210); wherein the impact bullet (210) has the same shape as a V50 test characteristic bullet; a sample fixing assembly (30), arranged on the fixing stand (10) and disposed below the test mold (20), and used for fixing the protective material sample (310) and detecting the protective performance of the protective material sample (310); The speed measuring component (40) is placed on the fixed stand (10) and is used to measure the falling speed of the test mold (20).

2. The material protection testing device according to claim 1, characterized in that: The test mold (20) comprises: A round tube (220) is connected to the impact bullet (210) and the impact bullet (210) is arranged at the bottom of the round tube (220) to enhance the impact strength of the impact bullet (210).

3. The material protection testing device according to claim 2, characterized in that: The test mold (20) further comprises: A plurality of counterweight blocks (230) are connected to the circular tube (220) and are used to adjust the impact strength of the impact bullet (210).

4. The material protection testing device according to claim 3, characterized in that: The device also includes: A first fixing hole (221) is formed on the side surface of the circular tube (220); The counterweight block (230) is provided with a connecting through hole and a second fixing hole (231) extending therethrough, and the counterweight block (230) is also provided with a fixing bar, and the connecting through hole and the second fixing hole (231) are perpendicular to each other; The counterweight block (230) is sleeved on the circular tube (220) through the connecting through hole, and the fixing bar passes through the second fixing hole (231) and is embedded in the first fixing hole (221).

5. The material protection testing device according to claim 4, characterized in that: The device also includes: an isolation assembly (50), arranged between the sample fixing assembly (30) and the test mold (20), and used for stopping the movement of the test mold (20) after the impact bullet (210) impacts the protective material sample (310), comprising an isolation fixing seat (510) and an isolation plate (520), wherein the isolation plate (520) is connected to the isolation fixing seat (510) in a detachable manner; The isolation plate (520) is provided with an impact through hole (530), the diameter of the impact through hole (530) is greater than the diameter of the round tube, and the diameter of the impact through hole (530) is smaller than the maximum diameter of the cross section of the test mold (20).

6. The material protection testing device according to claim 1, characterized in that: The device comprises: A clamping assembly is connected to the test mold (20) and is used to fix the test mold (20) and release the test mold (20) so that the test mold (20) falls freely.

7. The material protection testing device according to claim 6, characterized in that: The clamping assembly comprises: The electromagnetic acceleration component (60) is connected to the circular tube (220) and is used to provide acceleration to the test mold (20) to increase the impact strength of the test mold (20).

8. The material protection testing device according to claim 1, characterized in that: The fixed stand (10) comprises: A fixed base (110) used to support the sample fixing assembly (30); A support plate (120), arranged above the fixed base (110) and used for connecting the test mold (20); A bracket (130) is vertically arranged on the top of the fixing base (110) and connected to the supporting plate (120), and is used to fix the supporting plate (120).

9. The material protection testing device according to claim 8, characterized in that: The speed measuring component (40) is arranged on the bracket (130), and the speed measuring component (40) is provided with two speed measuring units (410), one of the speed measuring units (410) is at the same horizontal position as the starting position of the test mold (20), and the other of the speed measuring units (410) is at the same horizontal position as the protective material sample.

10. The material protection testing device according to claim 1, characterized in that: The sample fixing assembly (30) comprises a sample fixing frame (320), and the protective material sample (310) is connected to the sample fixing frame (320) in a detachable manner.

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