Explosion-proof detection device for actuator and use method of explosion-proof detection device

Abstract

The invention provides an actuator explosion-proof detection device and a use method thereof, and belongs to the field of actuator explosion-proof detection. Through holes are formed in at least two side surfaces of a shell of an actuator; the plug is arranged on the outer side of the through hole and tightly plugs the through hole; the housing covers the outer wall of the shell and covers the through hole and the plug, and a closed space is formed in the housing; one end of the cylinder is communicated with the interior of the housing; the two diaphragms are arranged in the cylinder body at intervals, the space between the two diaphragms is filled with a flowing medium, and the diaphragms are elastically deformed under the pressure change; and the optical fiber insertion core is aligned with one of the diaphragms, is connected with the detector and senses the deformation change of the diaphragms through the detector. The internal pressure of the housing is increased, so that the diaphragm in the cylinder is deformed, the distance between the optical fiber ferrule and the diaphragm is changed due to the deformation of the diaphragm, then the detector connected with the optical fiber ferrule senses the change of the reflection condition of an optical signal, and the situation that the plug does not effectively block the through hole can be inferred.

Description

Technical Field

[0001] The present invention relates to the technical field of explosion-proof detection of actuators, and particularly to an explosion-proof detection device for actuators and a using method thereof. Background Art

[0002] An actuator is an essential and important component in an automatic control system. Its function is to receive a control signal sent by a controller, change the magnitude of a controlled medium, so as to maintain the controlled variable at a required value or within a certain range. When an electric actuator is used in a hazardous environment, it needs to have properties such as explosion-proof, corrosion-proof, waterproof, and high-temperature resistance.

[0003] Generally, in addition to an axial hole for installing the actuator drive shaft being provided at the bottom of the actuator housing, through holes will also be provided on the other sides according to design requirements, so as to connect the internal components of the actuator with external devices through the through holes. The through holes on the actuator housing are generally fixed to the housing by a cap through fasteners. When detecting the explosion-proof performance of the actuator housing, the cap needs to be removed, and then the through holes on the actuator housing are blocked by plugs, and then pressurized liquid is filled into the housing through the axial hole at the bottom to simulate the instantaneous pressure generated when an explosion occurs inside the actuator (generally not less than 2 Mpa).

[0004] During the detection process, since the pressure inside the actuator housing is very high, when blocking the through holes on the actuator housing, if the plugs do not effectively block the through holes, it is not only difficult to determine whether it is the insufficient explosion-proof performance of the actuator housing itself or the detection failure caused by the plugs not blocking the through holes, but also it is easy to cause the internal pressure of the actuator to be too high and crush the plugs, resulting in a risk situation. Summary of the Invention

[0005] In view of this, the present invention provides an explosion-proof detection device for actuators and a using method thereof, which are used to solve the problem that it is difficult to determine whether the plugs effectively block the through holes when detecting the explosion-proof performance of the actuator housing at present.

[0006] The technical solution of the present invention is realized as follows: The present invention provides an explosion-proof detection device for actuators, including plugs, a housing, a cylinder, a diaphragm, and an optical fiber ferrule; at least two sides of the housing of the actuator are provided with through holes; the plugs are arranged outside the through holes and tightly block the through holes; the housing covers the outer wall of the housing and covers the through holes and the plugs, and a closed space is formed inside the housing; the cylinder is arranged on the housing, and one end of the cylinder is communicated with the inside of the housing; two diaphragms are arranged in the cylinder at intervals along the axial direction of the cylinder, a flowing medium is filled in the space between the two diaphragms, and the diaphragm undergoes elastic deformation under the change of pressure; the optical fiber ferrule is inserted into one end of the cylinder far from the housing and aligned with one of the diaphragms, and the optical fiber ferrule is connected to a detector and senses the deformation change of the diaphragm through the detector.

[0007] On the basis of the above technical solutions, preferably, the cylinder body includes a main body and a nozzle. The two ends of the main body are through; two nozzles are respectively inserted into the two ends of the main body. A diaphragm is attached to the end face of the inserted end of the nozzle. One end of one nozzle away from the main body is arranged on the housing and is in communication with the inside of the housing; the space of the main body between the two diaphragms forms a liquid cavity, and a flowing medium is filled in the liquid cavity.

[0008] More preferably, the cross-section of the liquid cavity along the axial direction of the cylinder body is trapezoidal, and the inner diameter of the liquid cavity towards the housing end is smaller than the inner diameter of the liquid cavity away from the housing end.

[0009] More preferably, it further includes a resisting part, a connecting rod and a screw rod; the resisting part is in resisting contact with the housing, and the resisting part and the plug clamp the housing; both ends of the connecting rod straddle the housing, one end of the connecting rod is connected to the resisting part, and the other end of the connecting rod extends to the side of the plug away from the housing; the screw rod is arranged at one end of the connecting rod close to the plug, one end of the screw rod is screwed to the end of the connecting rod, the other end of the screw rod is provided with a plug, and the screw rod rotates axially relative to the end of the connecting rod and drives the plug to resist or move away from the through hole; the housing is sleeved on the screw rod and is screwed to the screw rod, and the housing rotates axially relative to the screw rod and covers or moves away from the through hole.

[0010] More preferably, when the explosion-proof detection of the housing is carried out, the internal pressure of the housing is not less than 2 Mpa; the plug, the housing, the resisting part, the connecting rod and the screw rod are all made of metal materials, and the nozzle is made of glass tube.

[0011] More preferably, a protruding part is arranged on the outer wall of the housing, and a connecting hole is opened on the protruding part; one end of the nozzle connected to the housing passes through the connecting hole and is inserted into the protruding part. A matching block is arranged on the outer peripheral wall of the end of the nozzle inserted into the protruding part, and the matching block is in resisting contact with the inner wall of the protruding part and closes the connecting hole.

[0012] On the basis of the above technical solutions, preferably, the density and viscosity of the flowing medium are both less than that of water.

[0013] On the basis of the above technical solutions, preferably, the diaphragm includes a polymer layer, a chromium plating layer and a silver plating layer. The chromium plating layer is arranged between the polymer layer and the silver plating layer, and the silver plating layer faces the fiber optic ferrule.

[0014] More preferably, the thickness of the polymer layer is 250 nm to 500 nm, and the thickness of the silver plating layer is 150 nm to 250 nm.

[0015] On the other hand, the present invention also provides a method for using an actuator explosion-proof detection device. By using the above-mentioned actuator explosion-proof detection device, the method includes the following steps. Step 1: Select a plug and a housing according to the size of the through-hole to be blocked. Block the through-hole with the plug, cover the through-hole with the housing, and connect the cylindrical housing. Step 2: Deliver pressurized liquid into the housing through another unblocked through-hole to increase the internal pressure of the housing. Step 3: Connect the fiber optic ferrule to the detector and sense the deformation change of the diaphragm through the detector. If it is sensed that the diaphragm deforms, it is determined that the plug does not effectively block the through-hole, and repeat Step 1 to block the through-hole again.

[0016] The actuator explosion-proof detection device and its usage method of the present invention have the following

[0017] Advantages compared with the prior art:

[0018] (1) In the present invention, the housing covers the through-hole and the plug, so that a closed space is formed inside the housing. If the plug does not effectively block the through-hole, the internal pressure of the housing will increase, and then the diaphragm inside the cylinder will deform. The deformation of the diaphragm will change the distance between the fiber optic ferrule and the diaphragm, and further the detector connected to the fiber optic ferrule will sense the change in the reflection of the optical signal, and it can be judged that the internal pressure of the housing has changed and it is inferred that the plug does not effectively block the through-hole.

[0019] (2) In the present invention, a flowing medium is filled between two diaphragms. Compared with setting a single diaphragm to detect the deformation of a single diaphragm, after the pressure causes the inner diaphragm to deform, due to the instability of the pressure change, the deformation of the inner diaphragm will cause a resonance effect inside the flowing medium, and then conduct to the outer diaphragm, resulting in a more significant deformation, greatly improving the detection sensitivity.

[0020] (3) In the present invention, by designing the liquid cavity to be trapezoidal, the influence of the deformation of the inner diaphragm on the outer diaphragm can be amplified through the resonance effect of the flowing medium.

[0021] (4) In the present invention, through the sealing cooperation between the mating block and the convex part, on the one hand, it is convenient to reinstall the cylinder when replacing the housing according to the size of the through-hole, and on the other hand, it avoids the disconnection between the cylinder and the housing due to the increase in the internal pressure of the housing. Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1Stereogram of the housing of the present invention;

[0024] Figure 2 Side sectional view of the detection device of the present invention;

[0025] Figure 3 Of the present invention Figure 2 Enlarged view of part A in

[0026] Figure 4 Partial stereogram of the detection device of the present invention;

[0027] Figure 5 Partial three - dimensional exploded view of the detection device of the present invention;

[0028] Figure 6 Cross - sectional view of the diaphragm of the present invention.

[0029] In the figure: 1. Housing; 101. Through - hole; 2. Plug; 3. Cover shell; 31. Protruding part; 301. Connecting hole; 4. Cylinder; 40. Flowing medium; 41. Main body; 42. Connecting pipe; 401. Liquid cavity; 421. Fitting block; 5. Diaphragm; 51. Polymer layer; 52. Chromium - plated layer; 53. Silver - plated layer; 6. Fiber optic ferrule; 7. Supporting part; 8. Link; 9. Screw. Detailed implementation mode

[0030] Next, in combination with the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0031] As Figure 1 shown, in combination with Figure 2 and Figure 3 , an explosion - proof detection device for an actuator of the present invention includes a plug 2, a cover shell 3, a cylinder 4, a diaphragm 5 and a fiber optic ferrule 6.

[0032] Among them, at least two sides of the housing 1 of the actuator are provided with through - holes 101. Generally speaking, a total of three through - holes 101 are opened on the top and two adjacent sides of the housing 1 of the actuator. The shaft hole at the bottom of the actuator is used to set the drive shaft, and the actuator is connected to the valve shaft of the valve or regulator through the drive shaft. The housing 1 of the actuator is usually surrounded by a plurality of molded side plates and fixed by fastening bolts. During detection, after blocking the through - holes 101, pressurized liquid (such as brine) is poured into the housing 1 axially to rapidly increase the pressure inside the housing 1. If there is no water seepage or bursting of the housing 1 under high pressure, it means that the explosion - proof performance of the housing 1 meets the standard.

[0033] The plug 2 is arranged outside the through hole 101 and tightly blocks the through hole 101. Since the through hole 101 is blocked by the plug 2 during detection, and a sealing member such as a packing ring is filled between the plug 2 and the through hole 101. If the alignment between the plug 2 and the through hole 101 is inaccurate, or the packing ring is offset during installation, the large pressure inside the housing 1 during detection will squeeze open the packing ring, resulting in the plug 2 not being tightly blocked, and it will also be detected that water seeps into the housing 1. Even risks such as the housing 1 bursting may occur due to this.

[0034] The cover 3 covers the outer wall of the housing 1 and covers the through hole 101 and the plug 2. A closed space is formed inside the cover 3. At this time, if the plug 2 is not tightly blocked, the pressure inside the cover 3 will also increase accordingly.

[0035] The cylinder 4 is arranged on the cover 3, and one end of the cylinder 4 is communicated with the inside of the cover 3.

[0036] Two diaphragms 5 are arranged in the cylinder 4 at intervals along the axial direction of the cylinder 4. A flowing medium 40 is filled in the space between the two diaphragms 5. The diaphragms 5 undergo elastic deformation under the change of pressure.

[0037] The fiber optic ferrule 6 is inserted into one end of the cylinder 4 away from the cover 3 and aligned with one of the diaphragms 5. The fiber optic ferrule 6 is connected to a detector and senses the deformation change of the diaphragm 5 through the detector. The fiber optic ferrule 6 is usually used to transmit optical signals, and the detector can sense the deformation of the outer diaphragm 5 by measuring the change of the optical signal. Since when the outer diaphragm 5 deforms, the diaphragm 5 bulges into a shape similar to a hemisphere, and the distance between the diaphragm 5 and the fiber optic ferrule 5 changes, the detector actually senses the change in the time difference of the optical signal emitted by the fiber optic ferrule 5 and reflected back. At the same time, since the outer diaphragm 5 resonates with the flowing medium 40, its deformation will cause a small displacement of the diaphragm 5 relative to the fiber optic ferrule 6, thereby changing the characteristics of the optical signal, which is then sensed by the detector.

[0038] Relative to this technical solution, although a single diaphragm 5 can also be arranged in the cylinder body 4 so that the detector connected to the optical fiber ferrule 6 directly senses the deformation of the single diaphragm 5, it should be noted that although the pressure inside the housing 3 will gradually increase, due to the extrusion effect of the pressure inside the housing 1 on the sealing ring being discontinuous or unstable, the deformation amount of the single diaphragm 5 that occurs accordingly during the initial detection is substantially small and unstable. This will result in very low detection sensitivity of the detector and a delay in induction. In this technical solution, a flowing medium is filled between the two diaphragms 5. When the inner diaphragm 5 deforms, regardless of the strength of the deformation amount, or whether the diaphragm 5 will return from the deformed state to the non-deformed state due to unstable pressure changes, the deformation process will exert a pressure wave on the flowing medium 40. The conduction of the pressure wave in the flowing medium 40 will cause the diaphragm 5 located between the flowing medium 40 and the outer side to resonate. This resonance effect will not stop quickly as the deformation state of the diaphragm 5 stabilizes (because the medium will flow), so that the outer diaphragm 5 also undergoes continuous deformation under the action of this resonance effect and is then sensitively sensed by the detector.

[0039] Specifically, in this embodiment, it can be designed that the detector connected through the optical fiber ferrule 6 detects the resonance frequency f of the diaphragm 5 at the outer end of the cylinder body 4, and its calculation formula is

[0040] f =(c·E·h) / (2L·P·R 2 ) (1)

[0041] Among them, c represents the speed of sound propagation in the flowing medium 40, which reflects the conduction speed of the pressure wave in the flowing medium 40, E represents the elastic modulus of the diaphragm 5, h represents the thickness of the diaphragm 5, L represents the distance between the two diaphragms 5, R represents the radius of the diaphragm 5, and P represents the pressure exerted on the diaphragm 5 at the inner end of the cylinder body 4 by the inside of the housing 3. It can be seen from the above formula that the resonance frequency detected by the detector is inversely proportional to the elastic modulus and thickness of the diaphragm 5, and is inversely proportional to the pressure exerted on the diaphragm 5 by the inside of the housing 3, the radius of the diaphragm 5, and the length of the liquid cavity 401. It should be noted that when judging whether the plug 2 effectively seals the through hole 101 through this solution, it is not actually necessary to accurately detect the resonance frequency value of the diaphragm 5; through the above calculation formula of the present application, what is intended to be explained is that by adjusting these parameters, the detection sensitivity of the detection device can be optimized.

[0042] The derivation process of this calculation formula is as follows:

[0043] First of all, the calculation formula for the deformation amount of the diaphragm 5 is

[0044] Δx=(P·R 2 ) / (E·h) (2)

[0045] Then, consider the propagation of the pressure wave in the liquid chamber 401. The length L of the liquid chamber determines the propagation time t of the pressure wave, and its calculation formula is,

[0046] t = 2L / c (3)

[0047] Among them, 2L represents the total distance that the pressure wave travels from the inner diaphragm 5 to the outer diaphragm 5 and reflects back. Then, calculate the deformation amount caused by the pressure wave at the outer diaphragm 5 as,

[0048] Δx 外 = Δx 内 ·(c / 2L) -n (4)

[0049] Among them, n represents the exponent related to the system damping and energy transfer efficiency, and usually n ≥ 1

[0050] Therefore, the influence of the length L of the liquid chamber 401 on the deformation amount of the outer diaphragm 5 can be expressed as,

[0051] Δx 外 ∝(1 / L) n (5)

[0052] Combining formulas (2) to (5) can derive formula (1).

[0053] In Figure 4 In a preferred embodiment shown, the cylinder 4 includes a main body 41 and a nozzle 42.

[0054] Among them, both ends of the main body 41 are through. The main body 41 is printed by a ceramic material through an additive manufacturing technique. The reason for using the ceramic material is to avoid the influence of external temperature changes on the detection sensitivity and accuracy. At the same time, the ceramic material has a heat insulation effect and can also prevent the flowing medium 40 inside the cylinder 4 from being affected by temperature changes.

[0055] The two nozzles 42 are respectively inserted into both ends of the main body 41. The outer peripheral wall of the inserted end of the nozzle 42 and the inner wall of the main body 41 are sealed and connected by UV glue. A diaphragm 5 is attached to the end face of the inserted end of the nozzle 42, and the edge of the diaphragm 5 is attached to the end face of the nozzle 42 by photoresist; One end of one nozzle 42 away from the main body 41 is arranged on the housing 3 and is in communication with the inside of the housing 3, and it can also be connected to the housing 3 by UV glue; The space between the two diaphragms 5 in the main body 41 forms a liquid chamber 401, and the liquid chamber 401 is filled with a flowing medium 40. The above design is adopted to adjust the size or length of the main body 41 and the nozzle 42 as needed for easy assembly.

[0056] In Figure 3In a preferred embodiment shown, the cross-section of the liquid cavity 401 along the axial direction of the cylinder 4 is trapezoidal, and the inner diameter of the liquid cavity 401 at the end facing the cover 3 is smaller than the inner diameter of the liquid cavity 401 at the end far from the cover 3, so as to amplify the resonance effect inside the flowing medium 40, and further improve the sensitivity of the detector to sense the deformation of the outer diaphragm 5.

[0057] In Figure 2 In a preferred embodiment shown, since the internal pressure inside the housing 1 is very high during detection, the plug 2 cannot be directly fixed to the through hole 101 by fastening bolts, but the plug 2 needs to be pressed. Therefore, this embodiment further includes a holding part 7, a connecting rod 8 and a screw 9.

[0058] Among them, the holding part 7 is in abutting contact with the housing 1, and the holding part 7 and the plug 2 clamp the housing 1. An elastic pad can be provided on the contact surface between the holding part 7 and the surface of the housing 1 to increase the friction force and avoid damaging the housing 1.

[0059] The connecting rod 8 is similar to an inverted U shape. The two ends of the connecting rod 8 straddle the housing 1. One end of the connecting rod 8 is connected to the holding part 7, and the other end of the connecting rod 8 extends to the side of the plug 2 away from the housing 1; in order to improve the structural strength of the connecting rod 8, reinforcing ribs are provided at the turning position of the connecting rod 8.

[0060] The screw 9 is arranged at one end of the connecting rod 8 close to the plug 2. One end of the screw 9 is screwed to the end of the connecting rod 8, and the plug 2 is arranged at the other end of the screw 9. The plug 2 can be detachably connected to the end of the screw 9, such as by screwing or clamping, so as to be able to replace the size of the plug 2 according to the size of the through hole 101. The screw 9 rotates relative to the end of the connecting rod 8 and drives the plug 2 to abut against or away from the through hole 101, so as to ensure that the plug 2 can press the housing 1 to prevent the internal pressure of the housing 1 from pushing open the plug 2 during detection. The cover 3 is sleeved on the screw 9 and is screwed to the screw 9. The cover 3 rotates relative to the screw 9 and covers or moves away from the through hole 101; a sealing ring or gasket also needs to be provided at the contact part between the cover 3 and the housing 1.

[0061] In Figure 3 In a preferred embodiment shown, when performing an explosion-proof test on the housing 1, the internal pressure of the housing 1 is not less than 2 Mpa to simulate the instantaneous pressure generated when an explosion occurs inside the housing 1; the plug 2, the cover 3, the holding part 7, the connecting rod 8 and the screw 9 are all made of metal materials to ensure that they have sufficient structural strength to resist the internal pressure of the housing 1; the connecting pipe 42 is a glass tube.

[0062] In Figure 5In a preferred embodiment shown, since the connecting pipe 42 is a glass tube and the housing 3 is a metal shell, the connection strength and sealing of the two cannot be guaranteed by UV glue. Therefore, in this embodiment, a protrusion 31 is provided on the outer wall of the housing 3, and a connection hole 301 is provided on the protrusion 31; one end of the connecting pipe 42 connected to the housing 3 passes through the connection hole 301 and is inserted into the protrusion 31, and a matching block 421 is provided on the outer peripheral wall of the end of the connecting pipe 42 inserted into the protrusion 31, and the matching block 421 is in contact with the inner wall of the protrusion 31 and closes the connection hole 301. The surface of the matching block 421 facing the connection hole 301 can be connected to the protrusion 31 by UV glue, and at the same time, the increase in the internal pressure of the housing 3 will in disguise strengthen the force of the matching block 421 pressing and closing the connection hole 301.

[0063] exist Figure 3 In a preferred embodiment shown, the density and viscosity of the flowing medium 40 are both lower than those of water, so that the flowing medium 40 can flow even when the deformation of the inner diaphragm 5 is very small, thereby generating a resonance effect.

[0064] exist Figure 6 In a preferred embodiment shown, the diaphragm 5 includes a polymer layer 51, a chrome-plated layer 52 and a silver-plated layer 53, wherein the chrome-plated layer 52 is disposed between the polymer layer 51 and the silver-plated layer 53, and the silver-plated layer 53 faces the optical fiber ferrule 6. The polymer layer 51 is made of PMMA material, which has high elasticity, and makes the diaphragm 5 highly sensitive to deformation. The silver-plated layer 53 serves as a light reflection surface, and since the hardness of the polymer layer 51 is very low, the silver-plated layer 53 improves the rigidity of the diaphragm 5 and ensures the intensity of the reflected light by utilizing the high reflectivity of the silver-plated layer 53. The function of the chrome-plated layer 52 is to enhance the tightness of the connection between the polymer layer 51 and the silver-plated layer 53.

[0065] exist Figure 6 In a preferred embodiment shown, the thickness of the polymer layer 51 is 250nm-500nm, which ensures that it has good deformation performance while avoiding damage due to deformation; the thickness of the silver-plated layer 53 is 150nm-250nm, which helps to improve the hardness of the diaphragm 5 without affecting the deformation sensitivity of the diaphragm 5. Therefore, the diaphragm 5 under this design will not be too thick and difficult to deform.

[0066] like Figure 1 As shown, combined Figure 2 and Figure 3 The present invention provides a method for using an actuator explosion-proof detection device, which uses an actuator explosion-proof detection device of any of the above embodiments, and comprises the following steps:

[0067] Step 1: Select a plug 2 and a housing 3 according to the size of the through hole 101 to be blocked, so that the plug 2 blocks the through hole 101 and the housing 3 covers the through hole 101, and connect the cylinder body 4 to the housing 3. In this step, the selection of the plug 2 and the housing 3 is completed according to the size of the through hole 101, and the assembly of the detection device is completed.

[0068] Step 2: Convey pressurized liquid into the housing 1 through another unblocked through hole 101 to increase the internal pressure of the housing 1.

[0069] Step 3: Connect the optical fiber ferrule 6 to the detector and sense the deformation change of the sensing diaphragm 5 through the detector. If it is sensed that the diaphragm 5 generates deformation, it is determined that the plug 2 does not effectively block the through hole 101, and repeat Step 1 to block the through hole 101 again.

[0070] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An actuator explosion-proof detection device, characterized in that: It comprises a plug (2), a cover (3), a cylinder (4), a diaphragm (5) and an optical fiber insert (6); At least two side surfaces of the actuator housing (1) are provided with through holes (101); The plug (2) is arranged outside the through hole (101) and tightly blocks the through hole (101); The cover shell (3) is disposed on the outer wall of the housing (1) and covers the through hole (101) and the plug (2), and a closed space is formed inside the cover shell (3); The cylinder (4) is arranged on the cover (3), and one end of the cylinder (4) is connected to the interior of the cover (3); The two diaphragms (5) are arranged in the cylinder (4) at intervals along the axial direction of the cylinder (4), the space between the two diaphragms (5) is filled with a flowing medium (40), and the diaphragm (5) undergoes elastic deformation under pressure changes; The optical fiber insert (6) is inserted into one end of the barrel (4) away from the housing (3) and is aligned with one of the diaphragms (5). The optical fiber insert (6) is connected to a detector and senses the deformation change of the diaphragm (5) through the detector.

2. The actuator explosion-proof detection device according to claim 1, characterized in that: The cylinder (4) comprises a main body (41) and a connecting pipe (42). The main body (41) has two ends connected; The two connecting pipes (42) are respectively inserted into the two ends of the main body (41), and the end surfaces of the insertion ends of the connecting pipes (42) are covered with a diaphragm (5), and one end of one of the connecting pipes (42) away from the main body (41) is arranged on the cover (3) and communicated with the inside of the cover (3); The space between the main body (41) and the two diaphragms (5) forms a liquid chamber (401), and the liquid chamber (401) is filled with a flowing medium (40).

3. The actuator explosion-proof detection device according to claim 2, characterized in that: The cross-section of the liquid cavity (401) along the axial direction of the cylinder (4) is trapezoidal, and the inner diameter of the end of the liquid cavity (401) facing the housing (3) is smaller than the inner diameter of the end of the liquid cavity (401) away from the housing (3).

4. The actuator explosion-proof detection device according to claim 2, characterized in that: It also includes a supporting portion (7), a connecting rod (8) and a screw rod (9); The abutting portion (7) is in abutting contact with the housing (1), and the abutting portion (7) and the plug (2) clamp the housing (1); Both ends of the connecting rod (8) are straddled on the housing (1), one end of the connecting rod (8) is connected to the supporting portion (7), and the other end of the connecting rod (8) extends to a side of the plug (2) away from the housing (1); The screw rod (9) is arranged on one end of the connecting rod (8) close to the plug (2), one end of the screw rod (9) is threadedly connected to the end of the connecting rod (8), and the plug (2) is arranged on the other end of the screw rod (9). The screw rod (9) rotates relative to the end of the connecting rod (8) and drives the plug (2) to abut against or move away from the through hole (101); The cover shell (3) is sleeved on the screw rod (9) and is threadedly connected to the screw rod (9); the cover shell (3) rotates relative to the screw rod (9) axis and covers or is away from the through hole (101).

5. The actuator explosion-proof detection device according to claim 4, characterized in that: When the shell (1) is subjected to explosion-proof testing, the internal pressure of the shell (1) is not less than 2 Mpa; the plug (2), the cover shell (3), the abutment portion (7), the connecting rod (8) and the screw rod (9) are all made of metal materials, and the connecting pipe (42) is a glass tube.

6. The actuator explosion-proof detection device according to claim 5, characterized in that: The outer wall of the housing (3) is provided with a protruding portion (31), and the protruding portion (31) is provided with a connecting hole (301); One end of a connecting pipe (42) connected to the housing (3) passes through the connecting hole (301) and is inserted into the protruding portion (31); a matching block (421) is provided on the outer peripheral wall of the end portion of the connecting pipe (42) inserted into the protruding portion (31); the matching block (421) is in contact with the inner wall of the protruding portion (31) and closes the connecting hole (301).

7. The actuator explosion-proof detection device according to claim 1, characterized in that: The density and viscosity of the flow medium (40) are both lower than those of water.

8. The actuator explosion-proof detection device according to claim 1, characterized in that: The diaphragm (5) comprises a polymer layer (51), a chrome-plated layer (52) and a silver-plated layer (53); the chrome-plated layer (52) is arranged between the polymer layer (51) and the silver-plated layer (53); and the silver-plated layer (53) faces the optical fiber ferrule (6).

9. An actuator explosion-proof detection device according to claim 8, characterized in that: The thickness of the polymer layer (51) is 250nm to 500nm, and the thickness of the silver-plated layer (53) is 150nm to 250nm.

10. A method for using an actuator explosion-proof detection device, characterized in that: An actuator explosion-proof detection device according to any one of claims 1 to 9 is used, comprising the following steps: Step 1: Select a plug (2) and a cover (3) according to the size of the through hole (101) to be blocked, so that the plug (2) blocks the through hole (101), and the cover (3) covers the through hole (101), and connect the cylinder (4) and the cover (3); Step 2: delivering pressurized liquid into the housing (1) through the other blocked through hole (101) to increase the internal pressure of the housing (1); In step three, the optical fiber ferrule (6) is connected to a detector and the deformation change of the diaphragm (5) is sensed by the detector. If the diaphragm (5) is sensed to be deformed, it is determined that the plug (2) has not effectively blocked the through hole (101), and step one is repeated to block the through hole (101) again.

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