Anti-explosion valve wave absorbing performance test tool

Abstract

The invention provides a test tool for the wave absorbing performance of an explosion-proof valve, and relates to the technical field of impact testing. The anti-explosion valve wave absorbing performance test tool comprises an impact detection module and an analysis module. The number of the impact detection modules is two, and the impact detection modules are arranged on the two sides of the anti-explosion valve respectively. The impact detection module comprises a square hollow bracket, a sensor fixing barrel, an impact sensor and a tension spring; the sensor fixing barrel is arranged in the middle of the square hollow support in a suspended mode. The analysis module is used for collecting and analyzing data collected by the impact sensor. The impact detection module is arranged in a suspended manner, so that the impact sensor can be prevented from being influenced by natural vibration after the valve is impacted, and the detection precision is improved.

Description

Technical Field

[0001] The invention relates to the technical field of impact testing, in particular to a test tool for wave-absorbing performance of explosion-proof wave valves. Background Art

[0002] In the process of testing the wave-dissipating performance of traditional explosion-proof valves, the impact sensor is usually directly installed on the valve. Since the valve will vibrate when it is impacted, it will affect the detection accuracy of the impact sensor on the one hand, and the self-vibration of the door body may cause damage to the sensor on the other hand. In addition, most existing impact sensors are single-range sensors that can only measure small or large impacts separately, and do not have functions such as large range and high precision. Therefore, how to improve the range of the impact sensor while preventing the impact of door body vibration is currently a technical difficulty. Summary of the invention

[0003] In view of the above technical problems, the present invention provides a test tool for the wave-absorbing performance of an explosion-proof wave valve, comprising: an impact detection module and an analysis module; the number of the impact detection modules is two, which are respectively arranged on both sides of the explosion-proof wave valve; the impact detection module comprises: a square hollow bracket, a sensor fixing barrel, an impact sensor and a tension spring; a plurality of first fixing hooks are arranged around the sensor fixing barrel, a plurality of second fixing hooks are arranged at the diagonal positions of the square hollow bracket, a tension spring connects the first fixing hooks and the second fixing hooks, and the sensor fixing barrel is suspended in the middle of the square hollow bracket; the impact sensor is fixedly arranged on the inner side of the sensor fixing barrel; the analysis module is used for collecting and analyzing data collected by the impact sensor.

[0004] Optionally, the impact sensor includes a sensor body, a pressure-sensitive body, a first fixing ring, a sealing circular plate, a front fixing ring, a guide ring, a guide hole and a pressure-sensitive optical fiber; the sensor body is a hollow cylinder with openings at both ends, and a cross beam is arranged inside; the middle part of the cross beam is a circular ring, and four elastic cantilever beams are equidistantly arranged outside; one end of the pressure-sensitive body passes through the circular ring in the middle part of the cross beam, and is fixed to the cross beam through the first fixing ring.

[0005] Optionally, a first annular groove and a second annular groove are provided on the pressure-sensitive side of the sensor body, and the diameter of the first annular groove is larger than the diameter of the second annular groove; the guide ring is a hollow circular ring and its outward side is provided with a transition surface with a central protrusion and flat on both sides, the inner diameter of the guide ring is loosely matched with the outer diameter of the pressure-sensitive body, and the outer diameter of the guide ring matches the inner diameter of the second annular groove; the guide ring is fixedly arranged on the inner side of the second annular groove; a plurality of guide holes are provided at the position of the second annular groove corresponding to the transition surface; the front fixing ring matches the size of the first annular groove and is fixedly arranged on the inner side of the first annular groove; the inner diameter of the front fixing ring is smaller than the inner diameter of the guide ring.

[0006] Optionally, the pressure-sensing body includes a first body, a second body, a pressure-sensing diaphragm, a first force transmission rod, a first elastic column, a pressure-bearing fixed column, a spring, a second fixing ring, a first disc and a second disc; the first body and the second body are both cylindrical and are integrally formed, and the diameter of the first body is greater than the diameter of the second body; the outer side of the second body is provided with a thread, and the inner side of the first fixing ring is provided with a matching thread; the interior of the first body is provided with a first body cavity, a first hollow limiting column and a first body groove; the interior of the second body is provided with a second body cavity, a second body groove and an optical fiber guide hole; the first body cavity and the second body cavity are coaxially arranged cylindrical cavities; the first hollow limiting column is provided inside the first body cavity, and the first body groove is provided on the outward side of the first body cavity; the second body groove is provided on the outward side of the second body cavity; a central guide hole is provided in the middle of the pressure-sensing body, and the central guide hole connects the first body cavity and the second body cavity and is coaxially arranged with the two.

[0007] Optionally, the pressure-sensitive diaphragm is sealed in the first main body groove by the second fixing ring; the first disc is provided in the middle of the pressure-sensitive diaphragm, the second disc is provided at the end of the first force transmission rod close to the pressure-sensitive diaphragm, and the first disc is fixedly connected to the second disc; the first force transmission rod is a solid cylinder and is gap-matched with the central guide hole; the first force transmission rod passes through the central guide hole and abuts against the first elastic column; the pressure-bearing fixed column is fixed in the second main body groove, the first elastic column is provided on the inner side of the pressure-bearing fixed column, and the first elastic column is arranged on the inner side of the second main body cavity; the first elastic column is provided with a through first optical fiber through hole inside; the second body is provided with a through optical fiber guide hole; the diameter of the optical fiber guide hole is larger than the diameter of the first optical fiber through hole and the two are coaxially arranged.

[0008] Optionally, a spring is disposed inside the first hollow limiting column, and the spring is sleeved on the outside of the first force transmission rod and abuts against the second disc and the inner wall of the first main body cavity.

[0009] Optionally, the sealing circular plate includes a first circular fixing plate, a second circular fixing plate, a second hollow limiting column, and a second elastic column; the diameter of the first circular fixing plate is larger than the diameter of the second circular fixing plate, and the diameter of the second circular fixing plate matches the inner diameter of the sensor body; the first circular fixing plate is fixedly arranged at one end of the sensor body; the second elastic column is arranged on the inner side of the second hollow limiting column; a second through optical fiber through-hole is arranged inside the second elastic column, and a through groove is opened at a position corresponding to the second hollow limiting column and the second optical fiber through-hole; a second force transmission rod is arranged on the outward side of the pressure-bearing fixing column; the second force transmission rod abuts against the second elastic column; a rectangular groove is arranged on the second circular fixing plate, and a fiber lead-in hole connected to the outside is arranged on the first circular fixing plate, and the rectangular groove is connected to the fiber lead-in hole.

[0010] Optionally, a first pressure-sensitive grating and a second pressure-sensitive grating are provided on the pressure-sensitive optical fiber; the first pressure-sensitive grating is provided in the first optical fiber perforation, and the second pressure-sensitive grating is provided in the second optical fiber perforation; the reflection wavelengths of the first pressure-sensitive grating and the second pressure-sensitive grating are different.

[0011] Compared with the prior art, the present invention has achieved the following technical effects: the impact detection module is suspended to prevent the self-vibration of the valve after the impact and affect the impact sensor, thereby improving the detection accuracy. The dual-range setting of the impact sensor increases the impact measurement range. The same light source setting can ensure the synchronization of the collected data and reduce the error caused by the delay in data collection. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 A schematic diagram of a test structure of a blast-proof wave valve wave-absorbing performance test tool provided in one embodiment of the present invention; Figure 2 A schematic diagram of the structure of a test tool for the wave-absorbing performance of an explosion-proof wave valve provided in one embodiment of the present invention; Figure 3 A schematic diagram of the explosion structure of an impact sensor in a test tool for the wave-absorbing performance of an explosion-proof wave valve provided in one embodiment of the present invention; Figure 4 A cross-sectional schematic diagram of an impact sensor in a tooling for testing the wave-absorbing performance of an explosion-proof wave valve provided in one embodiment of the present invention; Figure 5 A schematic diagram of the internal structure of an impact sensor in a tooling for testing the wave-absorbing performance of an explosion-proof valve provided by an embodiment of the present invention; Figure 6 A schematic diagram of the structure of a pressure-bearing fixed column inside an impact sensor in a tooling for testing the wave-absorbing performance of an explosion-proof wave valve provided in one embodiment of the present invention; Figure 7 A schematic structural diagram of a sensor body in an impact sensor in a tooling for testing the wave-absorbing performance of an explosion-proof wave valve provided in one embodiment of the present invention; Figure 8 A schematic structural diagram of a pressure-sensing body in an impact sensor in a tooling for testing the wave-absorbing performance of an explosion-proof wave valve provided in one embodiment of the present invention; Fig. 9 A schematic diagram of the structure of a sealing circular plate in an impact sensor in a tooling for testing the wave-absorbing performance of an explosion-proof wave valve provided in one embodiment of the present invention; Fig.10 A schematic diagram of the connection of a pressure-sensitive optical fiber in a test tool for the wave-absorbing performance of an explosion-proof wave valve provided in one embodiment of the present invention.

[0013] Description of reference numerals: 1. square hollow bracket; 2. sensor fixing barrel; 3. impact sensor; 31. sensor body; 311. cross beam; 312. first annular groove; 313. second annular groove; 32. pressure-sensitive body; 321. first body; 3211. center guide hole; 3212. first body cavity; 3213. first hollow limit column; 3214. first body groove; 322. second body; 3221. second body cavity; 3222. second body groove; 3223. optical fiber guide hole; 323. pressure-sensitive diaphragm; 3231. first disc; 324. first force transmission rod; 3241. second disc; 325. first elastic column; 3251. first optical fiber perforation; 3252. first hemispherical groove; 326. pressure-bearing fixed column; 3261. second force transmission rod; 327. spring; 328. second fixing ring; 33. First fixing ring; 34. Sealing circular plate; 341. First circular fixing plate; 342. Second circular fixing plate; 343. Second hollow limiting column; 344. Second elastic column; 3441. Second optical fiber perforation; 3442. Second hemispherical groove; 35. Front fixing ring; 36. Guide ring; 37. Guide hole; 38. Pressure-sensitive optical fiber; 381. First pressure-sensitive grating; 382. Second pressure-sensitive grating; 4. Tension spring.

[0014] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0015] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0016] like Figure 1-Figure 10As shown, an embodiment of the present invention provides a test tool for the wave-absorbing performance of an explosion-proof wave valve, comprising: an impact detection module and an analysis module; the number of the impact detection modules is two, which are respectively arranged on both sides of the explosion-proof wave valve; the impact detection module comprises: a square hollow bracket 1, a sensor fixing barrel 2, an impact sensor 3 and a tension spring 4; a plurality of first fixing hooks are arranged around the sensor fixing barrel 2, a plurality of second fixing hooks are arranged at the diagonal positions of the square hollow bracket 1, and the tension spring 4 connects the first fixing hooks and the second fixing hooks, and the sensor fixing barrel 2 is suspended in the middle of the square hollow bracket 1; the impact sensor 3 is fixedly arranged on the inner side of the sensor fixing barrel 2; the analysis module is used for collecting and analyzing the data collected by the impact sensor 3.

[0017] Optionally, the impact sensor 3 includes a sensor body 31, a pressure-sensitive body 32, a first fixing ring 33, a sealing circular plate 34, a front fixing ring 35, a guide ring 36, a guide hole 37 and a pressure-sensitive optical fiber 38; the sensor body 31 is a hollow cylinder with openings at both ends, and a (integrated) cross beam 311 is arranged inside; the middle part of the cross beam 311 is a circular ring, and four elastic cantilever beams are equidistantly arranged outside; one end of the pressure-sensitive body 32 passes through the circular ring in the middle part of the cross beam 311, and is fixed to the cross beam 311 through the first fixing ring 33.

[0018] Optionally, a first annular groove 312 and a second annular groove 313 are provided on the pressure-sensing side of the sensor body 31, and the diameter of the first annular groove 312 is larger than the diameter of the second annular groove 313; the guide ring 36 is a hollow circular ring and its outward side is provided with a transition surface with a central protrusion and flat on both sides, the inner diameter of the guide ring 36 is loosely matched with the outer diameter of the pressure-sensing body 32, and the outer diameter of the guide ring 36 matches the inner diameter of the second annular groove 313; the guide ring 36 is fixedly arranged on the inner side of the second annular groove 313; a plurality of guide holes 37 are provided at the position of the second annular groove 313 corresponding to the transition surface; the front fixing ring 35 matches the size of the first annular groove 312 and is fixedly arranged on the inner side of the first annular groove 312; the inner diameter of the front fixing ring 35 is smaller than the inner diameter of the guide ring 36.

[0019] Optionally, the pressure-sensing body 32 includes a first body 321, a second body 322, a pressure-sensing diaphragm 323, a first force-transmitting rod 324, a first elastic column 325, a pressure-bearing fixed column 326, a spring 327, a second fixed ring 328, a first disc 3231 and a second disc 3241; the first body 321 and the second body 322 are both cylindrical and are integrally formed, and the diameter of the first body 321 is greater than the diameter of the second body 322; the outer side of the second body 322 is provided with a thread, and the inner side of the first fixed ring 33 is provided with a matching thread; the interior of the first body 321 is provided with a first body cavity 3212, a first hollow limiting column 3213 and a first body groove 321 4; the interior of the second body 322 is provided with a second body cavity 3221, a second body groove 3222 and an optical fiber guide hole 3223; the first body cavity 3212 and the second body cavity 3221 are coaxial cylindrical cavities; the first body cavity 3212 is provided with the first hollow limiting column 3213, and the outward side of the first body cavity 3212 is provided with an annular first body groove 3214; the outward side of the second body cavity 3221 is provided with an annular second body groove 3222; the middle part of the pressure-sensing body 32 is provided with a central guide hole 3211, and the central guide hole 3211 connects the first body cavity 3212 and the second body cavity 3221 and is coaxially arranged with the two.

[0020] Optionally, the pressure-sensitive diaphragm 323 is sealed and arranged in the first main body groove 3214 through the second fixing ring 328; the first round piece 3231 is arranged in the middle of the pressure-sensitive diaphragm 323, and the second round piece 3241 is arranged at the end of the first force-transmitting rod 324 close to the pressure-sensitive diaphragm 323, and the first round piece 3231 is fixedly connected with the second round piece 3241; the first force-transmitting rod 324 is a solid cylinder and is clearance-matched with the central guide hole 3211; the first force-transmitting rod 324 passes through the central guide hole 3211 And abuts the first elastic column 325; the pressure-bearing fixed column 326 is fixed in the second main body groove 3222, and the first elastic column 325 is arranged on the inner side of the pressure-bearing fixed column 326, and the first elastic column 325 is arranged on the inner side of the second main body cavity 3221; the interior of the first elastic column 325 is provided with a through first optical fiber through hole 3251; the second body 322 is provided with a through optical fiber guide hole 3223; the diameter of the optical fiber guide hole 3223 is larger than the diameter of the first optical fiber through hole 3251 and the two are coaxially arranged.

[0021] Optionally, a spring 327 is disposed inside the first hollow limiting column 3213 , and the spring 327 is sleeved on the outside of the first force transmission rod 324 and abuts against the second disc 3241 and the inner wall of the first main body cavity 3212 .

[0022] Optionally, the sealing circular plate 34 includes a first circular fixing plate 341, a second circular fixing plate 342, a second hollow limiting column 343, and a second elastic column 344; the diameter of the first circular fixing plate 341 is larger than the diameter of the second circular fixing plate 342, and the diameter of the second circular fixing plate 342 matches the inner diameter of the sensor body 31; the first circular fixing plate 341 is fixedly arranged at one end of the sensor body 31; the second elastic column 344 is arranged on the inner side of the second hollow limiting column 343; the interior of the second elastic column 344 is provided with a through second optical fiber through hole 3441, and a through groove is provided at a position corresponding to the second hollow limiting column 343 and the second optical fiber through hole 3441; a second force transmission rod 3261 is arranged on the outward side of the pressure-bearing fixing column 326; the second force transmission rod 3261 abuts against the second elastic column 344.

[0023] Optionally, a rectangular groove 345 is provided on the second circular fixing plate 342 , and a fiber guide hole 346 communicating with the outside is provided on the first circular fixing plate 341 , and the rectangular groove 345 is communicated with the fiber guide hole 346 .

[0024] Optionally, one end of the first force transmission rod 324 and the second force transmission rod 3261 that abuts against the elastic column is a hemispherical ball head; the position where the first elastic column 325 and the second elastic column 344 abut against the force transmission rod is respectively provided with a first hemispherical groove 3252 and a second hemispherical groove 3442.

[0025] Optionally, a first pressure-sensitive grating 381 and a second pressure-sensitive grating 382 are provided on the pressure-sensitive optical fiber 38; the first pressure-sensitive grating 381 is arranged in the first optical fiber perforation 3251, and the second pressure-sensitive grating 382 is arranged in the second optical fiber perforation 3441; the reflection wavelengths of the first pressure-sensitive grating 381 and the second pressure-sensitive grating 382 are different (when the grating is subjected to external force, its reflection wavelength will change and wavelength drift will occur, and the external force can be monitored by monitoring the wavelength drift).

[0026] Optionally, the pressure-sensitive optical fibers in the two impact detection modules share the same laser light source, and the reflection wavelengths of the four pressure-sensitive gratings are different (the connection method can be: light source → coupler → 1x2 beam splitter → different pressure-sensitive optical fibers 38; the coupler return light end is connected to the analysis module); the two pressure-sensitive optical fibers have the same length.

[0027] Optionally, the pressure-sensitive diaphragm 323 , the first round piece 3231 , and the second round piece 3241 are all elastic metal sheets, which are connected by welding.

[0028] Optionally, the impact detection module can be fixedly installed on both sides of the explosion-proof valve, including welding, bolts, connecting plates and other fixing methods.

[0029] Working principle of the explosion-proof valve wave-absorbing performance test tooling: shock detection modules are set on both sides of the explosion-proof valve, and the shock wave intensity on both sides of the valve is detected through the shock detection module. The value collected at the rear side of the valve is divided by the value collected at the front side of the valve to obtain the valve wave-absorbing information. The shock detection module is suspended to prevent the self-vibration of the valve after the impact on the impact sensor and improve the detection accuracy.

[0030] The impact sensor adopts a dual-range setting method. The first range is the structure related to the pressure-sensitive body 32. Specifically, the pressure-sensitive diaphragm 323, the first force transmission rod 324, the spring 327, and the first elastic column 325 constitute the first elastic force structure; the second range is the structure related to the cross beam 311. Specifically, the cross beam 311, the second force transmission rod 3261, and the second elastic column 344 constitute the second elastic force structure; the elastic modulus of the first elastic structure is smaller than the elastic modulus of the second elastic structure (the larger the elastic modulus, the smaller the deformation against the same external force); when impacted, the pressure-sensitive diaphragm 323 and the spring 327 move synchronously, driving the first force transmission rod 324 to press against the second The first elastic column 325 is sensed by the first pressure-sensitive grating 381 for deformation. When the first range is exceeded, the first hollow limit column 3213 abuts against the pressure-sensitive diaphragm 323, and the pressure-sensitive diaphragm 323 and the first force-transmitting rod 324 no longer produce inward displacement. The cross beam 311 related structure of the second range is in a state of being constantly stressed when impacted. The pressure-sensitive body 32 drives the second force-transmitting rod 3261 to move, and the second force-transmitting rod 3261 presses against the second elastic column 344 and senses the deformation by the second pressure-sensitive grating 382. When the second range is exceeded, the second hollow limit column 343 abuts against the pressure-bearing fixed column 326, and the second force-transmitting rod 3261 no longer produces inward displacement. The dual-range setting method increases the impact measurement range.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention.

Claims

1. A test tool for the wave-absorbing performance of explosion-proof valves, comprising: Impact detection module, analysis module; There are two impact detection modules, which are respectively arranged on both sides of the explosion-proof valve; The impact detection module includes: a square hollow bracket, a sensor fixing barrel, an impact sensor and a tension spring; a plurality of first fixing hooks are arranged around the sensor fixing barrel, a plurality of second fixing hooks are arranged at the diagonal positions of the square hollow bracket, a tension spring connects the first fixing hooks and the second fixing hooks, and the sensor fixing barrel is suspended in the middle of the square hollow bracket; the impact sensor is fixed on the inner side of the sensor fixing barrel; the analysis module is used to collect and analyze the data collected by the impact sensor.

2. The test tool as claimed in claim 1, characterized in that: in, The impact sensor includes a sensor body, a pressure-sensitive body, a first fixing ring, a sealing circular plate, a front fixing ring, a guide ring, a guide hole and a pressure-sensitive optical fiber; the sensor body is a hollow cylinder with openings at both ends, and a cross beam is arranged inside; the middle part of the cross beam is a circular ring, and four elastic cantilever beams are equidistantly arranged outside; one end of the pressure-sensitive body passes through the circular ring in the middle part of the cross beam, and is fixed to the cross beam through the first fixing ring.

3. The test tool as claimed in claim 2, characterized in that: in, A first annular groove and a second annular groove are provided on the pressure-sensitive side of the sensor body, and the diameter of the first annular groove is larger than the diameter of the second annular groove; the guide ring is a hollow circular ring and a transitional curved surface with a central protrusion and flat sides is provided on its outward side, the inner diameter of the guide ring is loosely matched with the outer diameter of the pressure-sensitive body, and the outer diameter of the guide ring is matched with the inner diameter of the second annular groove; the guide ring is fixedly arranged on the inner side of the second annular groove; a plurality of guide holes are provided at the position of the second annular groove corresponding to the transitional curved surface; the front fixing ring matches the size of the first annular groove and is fixedly arranged on the inner side of the first annular groove; the inner diameter of the front fixing ring is smaller than the inner diameter of the guide ring.

4. The test tool as claimed in claim 3, characterized in that: in, The pressure-sensing body comprises a first body, a second body, a pressure-sensing diaphragm, a first force-transmitting rod, a first elastic column, a pressure-bearing fixed column, a spring, a second fixed ring, a first disc and a second disc; the first body and the second body are both cylindrical and are integrally formed, and the diameter of the first body is greater than the diameter of the second body; a thread is arranged on the outer side of the second body, and a thread matching the thread is arranged on the inner side of the first fixed ring; a first body cavity, a first hollow limiting column and a first body groove are arranged inside the first body; a second body cavity, a second body groove and an optical fiber guide hole are arranged inside the second body; the first body cavity and the second body cavity are coaxial cylindrical cavities; the first hollow limiting column is arranged inside the first body cavity, and the first body groove is arranged in an annular shape on the outward side of the first body cavity; the second body groove is arranged in an annular shape on the outward side of the second body cavity; a central guide hole is arranged in the middle of the pressure-sensing body, and the central guide hole connects the first body cavity and the second body cavity and is coaxially arranged with the two.

5. The test tool as claimed in claim 4, characterized in that: in, The pressure-sensitive diaphragm is sealed and arranged in the first main body groove through the second fixing ring; the first disc is arranged in the middle of the pressure-sensitive diaphragm, and the second disc is arranged at the end of the first force transmission rod close to the pressure-sensitive diaphragm, and the first disc is fixedly connected with the second disc; the first force transmission rod is a solid cylinder and is gap-matched with the central guide hole; the first force transmission rod passes through the central guide hole and abuts against the first elastic column; the pressure-bearing fixed column is fixed in the second main body groove, and the first elastic column is arranged on the inner side of the pressure-bearing fixed column, and the first elastic column is arranged on the inner side of the second main body cavity; the first elastic column is provided with a through first optical fiber through hole inside; the second body is provided with a through optical fiber guide hole; the diameter of the optical fiber guide hole is larger than the diameter of the first optical fiber through hole and the two are coaxially arranged.

6. The test tool as claimed in claim 5, characterized in that: in, A spring is arranged inside the first hollow limiting column. The spring is sleeved on the outside of the first force transmission rod and abuts against the second disc and the inner wall of the first main body cavity.

7. The test tool as claimed in claim 6, characterized in that: in, The sealing circular plate includes a first circular fixing plate, a second circular fixing plate, a second hollow limiting column, and a second elastic column; the diameter of the first circular fixing plate is larger than the diameter of the second circular fixing plate, and the diameter of the second circular fixing plate matches the inner diameter of the sensor body; the first circular fixing plate is fixedly arranged at one end of the sensor body; the second elastic column is arranged on the inner side of the second hollow limiting column; a through second optical fiber through hole is arranged inside the second elastic column, and a through groove is opened at a position corresponding to the second hollow limiting column and the second optical fiber through hole; a second force transmission rod is arranged on the outward side of the pressure-bearing fixing column; the second force transmission rod abuts against the second elastic column; a rectangular groove is arranged on the second circular fixing plate, and a fiber lead-in hole connected to the outside is arranged on the first circular fixing plate, and the rectangular groove is connected to the fiber lead-in hole.

8. The test tool as claimed in claim 7, characterized in that: in, The pressure-sensitive optical fiber is provided with a first pressure-sensitive grating and a second pressure-sensitive grating; the first pressure-sensitive grating is arranged in the first optical fiber perforation, and the second pressure-sensitive grating is arranged in the second optical fiber perforation; the reflection wavelengths of the first pressure-sensitive grating and the second pressure-sensitive grating are different.

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