Explosion-proof safety inspection device for chemical pipeline
By installing a pipe body and marking rod in the outer shell of the chemical pipeline to form a closed chamber, the problem of small leaky bubbles being small and inconvenient to distinguish leakage is solved, and a method of effectively judging leakage in chemical pipelines is realized.
Patent Information
- Application Number
- CN202422392167.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-29
- Publication Date
- 2025-06-24
- Estimated Expiration
- 2034-09-29
AI Technical Summary
In the prior art, the bubbles emerging from the tiny leak holes are small in size, which is inconvenient to distinguish whether chemical pipelines are leaking.
A chemical pipeline explosion-proof safety inspection device is designed, and a closed chamber is formed by setting a pipe body in the outer shell of the chemical pipeline and setting a marking rod outside the pipe body. When chemical gas leaks, the leaking gas is stored in a closed chamber until the pressure in the chamber is stronger than the atmospheric pressure, the marking rod is pushed to slide, and the leakage situation is judged by observing the change in the length of the marking rod.
By observing the sliding condition of the marking rod, it is possible to effectively judge whether there is leakage in the chemical pipeline. When the leakage hole is small, the gas leakage speed is slow, and the sliding speed of the marking rod is also slow, which extends the observation period and facilitates to determine whether the pipeline is leaking.
Smart Images
Figure CN223020013U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of chemical pipelines, and particularly relates to an anti-explosion safety inspection device for chemical pipelines. Background Art
[0002] Chemical pipelines refer to a pipeline system that connects various chemical equipment and machines according to the requirements of the chemical process flow to transport various media. Chemical pipelines usually consist of components such as pipes, pipe fittings, pipeline accessories, and valves. Among them, the pipe, as the main part of the pipeline, its material and performance directly affect the safety and reliability of the pipeline system. There are many flammable and explosive substances in chemical gases, and special care is needed during storage, transportation, and use to ensure the safety of personnel and equipment;
[0003] During the long-term operation of chemical pipelines, due to reasons such as wear, corrosion, or design defects, aging or failures may occur, resulting in raw material leakage. Therefore, it is particularly important to detect chemical pipeline leakage.
[0004] In the prior art, the bubble test method is one of the commonly used methods for detecting chemical pipeline leakage. Usually, a display liquid (such as water, soapy water, alcohol, high-boiling fluorinated oil, etc.) is sprayed on the chemical pipeline. When there is a pressure difference on both sides of the leak hole, the gas will flow from the high-pressure side to the low-pressure side through the leak hole, and bubbles will emerge at the leak hole, thus indicating the position of the leak hole. However, the bubbles emerging from the tiny leak holes are small in size, making it inconvenient to distinguish whether the chemical pipeline is leaking. Content of the Utility Model
[0005] In view of this, the purpose of the utility model is to provide an anti-explosion safety inspection device for chemical pipelines to solve the problem in the prior art that the bubbles emerging from the tiny leak holes are small in size, making it inconvenient to distinguish whether the chemical pipeline is leaking.
[0006] The utility model is realized through the following technical solutions:
[0007] An anti-explosion safety inspection device for chemical pipelines includes a pipe body for sleeving outside the chemical pipeline. Both ends of the pipe body are in sealed cooperation with the chemical pipeline, and a sealed chamber is formed between the pipe body and the chemical pipeline;
[0008] A marking rod is arranged outside the pipe body. One end of the marking rod penetrates the outer wall of the pipe body and inserts into the sealed chamber, and the marking rod is in sliding and sealed cooperation with the outer wall of the pipe body.
[0009] Further, the aperture values of the two open ends of the pipe body are smaller than the aperture value in the middle of the pipe body.
[0010] Further, the pipe body is composed of two semi-cylindrical shells spliced together. Two sides of the same side of the two shells are hinged, and the two sides of the other side are detachably connected.
[0011] Further, a guide post coaxial with the marking rod is fixedly connected to the outside of one of the shells, and a guide hole is formed in the guide post and axially extends through the guide post and the outer wall of the corresponding shell in sequence;
[0012] The marking rod is embedded in the guide hole, and a piston is fixedly connected to one end of the marking rod facing the corresponding shell, and the piston is slidably and sealingly engaged with the guide hole.
[0013] Further, a plurality of metal sheets are provided on one side of the marking rod, and the plurality of metal sheets are uniformly arranged along the axial direction of the marking rod;
[0014] The metal sheets are perpendicular to the marking rod, and one side edge of the metal sheets is fixedly connected to the marking rod.
[0015] Further, a dial is provided on the side of the metal sheet facing away from the marking rod and is parallel to the metal sheet, and one side edge of the dial is fixedly connected to the inner wall of the end of the guide hole facing away from the corresponding shell;
[0016] The other side edge of the dial extends towards the marking column and is inserted into the gap between two adjacent metal sheets, and the movement trajectories of the plurality of metal sheets all intersect with the dial.
[0017] Further, a chute extending axially is formed in the side wall of the marking rod facing away from the metal sheet, a limiting block is arranged in the opening at the end of the guide post facing away from the corresponding shell, one end of the limiting block is fixedly connected to the inner wall of the guide hole, and the other end is inserted into the chute and is slidably engaged.
[0018] Further, a compression spring is arranged in the chute, one end of the compression spring is fixedly connected to the piston, and the other end is fixedly connected to the limiting block;
[0019] The axial dimension value of the piston plus the axial dimension value of the marking rod is equal to the axial dimension value of the guide hole, and when the compression spring is in the natural stretching state, both the piston and the marking rod are completely embedded in the guide hole.
[0020] Further, convex blocks are provided on both sides of the other sides of the two shells, one side wall of the convex blocks is fixedly connected to the outer wall of the corresponding shell, and the other side wall extends away from the shell;
[0021] Notches are formed in the side walls of the two convex blocks facing away from the corresponding shells, a connecting rod is jointly embedded in the two notches, one end of the connecting rod is rotatably connected to the side walls of one of the notches, and the plane of the rotation trajectory is perpendicular to the hinge axis of the two shells;
[0022] The other end of the connecting rod is connected with a pressing block, and the outer dimension of the pressing block is larger than the dimension of the notch.
[0023] Further, the pressing block is sleeved outside the connecting rod and connected by thread fit.
[0024] The beneficial effects of the present utility model are as follows:
[0025] For this chemical pipeline explosion-proof safety inspection device, by sleeving the pipe body outside the chemical pipeline and making a sealed fit, a closed chamber is formed between the inside of the pipe body and the chemical pipeline. By setting a marking rod outside the pipe body and inserting the marking rod through the outer wall of the pipe body into the closed chamber, when leakage occurs in the area of the chemical pipeline covered by the pipe body, the leaked chemical gas is stored in the closed chamber. When the pressure in the closed chamber is greater than the atmospheric pressure, the marking rod is pushed to slide outside the pipe body. By observing the change in the length of the section of the marking rod protruding outside the pipe body, it can be determined whether there is a leakage in this section of the chemical pipeline covered by the pipe body.
[0026] When the leakage hole is small, the leakage speed of the chemical gas is slow, resulting in a slow sliding speed of the marking column. The observation period of the marking column can be appropriately extended. After a large amount of chemical gas is stored in the closed chamber, the marking rod slides a relatively long distance cumulatively, which is convenient for relevant technical personnel to observe the position change of the marking rod, and thus convenient for distinguishing whether the chemical pipeline is leaking.
[0027] Other advantages, objectives, and features of the present utility model will be described to some extent in the subsequent description, and to some extent, will be obvious to those skilled in the art based on the study of the following text, or can be taught from the practice of the present utility model. The objectives and other advantages of the present utility model can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] Figure 1 is a three-dimensional structural schematic diagram (state one) of an embodiment of the present utility model;
[0029] Figure 2 is a three-dimensional structural schematic diagram (state two) of an embodiment of the present utility model;
[0030] Figure 3 is a left view of an embodiment of the present utility model;
[0031] Figure 4 is a three-dimensional structural schematic diagram of the marking rod in an embodiment of the present utility model;
[0032] Figure 5 is a three-dimensional structural schematic diagram of the connecting rod in an embodiment of the present utility model;
[0033] Figure 6 position Figure 3 is a cross-sectional view taken along A-A in;
[0034] Figure 7 isFigure 6 An enlarged view at position B in the [device].
[0035] In the figure: pipe body 1, housing 11, bump 111, notch 112, guide post 12, guide hole 121, paddle 122, limit block 123, pressure relief hole 124, sealing strip 13, connecting rod 14, rotating shaft 141, pressing block 15;
[0036] Marking rod 2, piston 21, metal sheet 22, sliding groove 23, compression spring 24. Detailed implementation manners
[0037] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some but not all of the embodiments of the present utility model. Generally, the components of the embodiments of the present utility model described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.
[0038] Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the present utility model to be protected, but merely represents the selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts fall within the scope of protection of the present utility model.
[0039] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.
[0040] In the above description of the present utility model, it should be noted that the orientation or positional relationship indicated by terms such as "one side", "the other side", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present utility model is usually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present utility model. In addition, terms such as "first", "second", etc. are only used for descriptive distinction and cannot be construed as indicating or implying relative importance.
[0041] In addition, terms such as "identical" do not mean that the components must be absolutely identical, but there may be slight differences. The term "perpendicular" only means that the positional relationship between components is more perpendicular relative to "parallel", and does not mean that the structure must be completely perpendicular, but can be slightly inclined.
[0042] Please refer to Figure 1-7, the present utility model provides a technical solution: a chemical pipeline explosion-proof safety inspection device, including a pipe body 1 for sleeving outside the chemical pipeline, the two ends of the pipe body 1 are hermetically fitted with the chemical pipeline, and a sealed chamber is formed between the pipe body 1 and the chemical pipeline;
[0043] A marking rod 2 is arranged outside the pipe body 1, one end of the marking rod 2 penetrates the outer wall of the pipe body 1 and inserts into the sealed chamber, and the marking rod 2 is slidably and hermetically fitted with the outer wall of the pipe body 1.
[0044] By sleeving the pipe body 1 outside the chemical pipeline and hermetically fitting it, a sealed chamber is formed between the inside of the pipe body 1 and the chemical pipeline. By arranging the marking rod 2 outside the pipe body 1 and inserting the marking rod 2 through the outer wall of the pipe body 1 into the sealed chamber, when leakage occurs in the area where the chemical pipeline is covered by the pipe body 1, the leaked chemical gas is stored in the sealed chamber. When the pressure in the sealed chamber is greater than the atmospheric pressure, the marking rod 2 is pushed to slide out of the pipe body 1. By observing the change in the length of the section of the marking rod 2 protruding outside the pipe body 1, it can be determined whether there is a leakage in the section of the chemical pipeline covered by the pipe body 1.
[0045] When the leakage hole is small, the leakage speed of the chemical gas is slow, which makes the sliding speed of the marking column slow. The observation period of the marking column can be appropriately extended. After a large amount of chemical gas is stored in the sealed chamber, the marking rod 2 slides a relatively long distance cumulatively, so that relevant technical personnel can easily observe the position change of the marking rod 2, and then it is convenient to distinguish whether the chemical pipeline is leaking.
[0046] In this embodiment: the aperture values of the two openings at both ends of the pipe body 1 are smaller than the aperture value in the middle of the pipe body 1.
[0047] By setting the aperture values of the two openings at both ends of the pipe body 1 to be smaller than the aperture value in the middle of the pipe body 1, when the pipe body 1 is sleeved outside the chemical pipeline, the inner circular surfaces of the two openings at both ends of the pipe body 1 are in contact with and against the outer circular surface of the chemical pipeline, so that there is a gap between the inner circular surface in the middle of the pipe body 1 and the outer circular surface of the chemical pipeline; circular sealing strips 13 are pasted on the inner circular surfaces of the two openings at both ends of the pipe body 1, and the pipe body 1 and the chemical pipeline form a sealed chamber through the contact of the sealing strips 13 with the outer circular surface of the chemical pipeline, restricting the leaked chemical gas in the chemical pipeline from moving out of the pipe body 1.
[0048] In this embodiment: the pipe body 1 is composed of two semi-cylindrical shells 11 spliced together, and two sides of the same side of the two shells 11 are hinged, and the two sides of the other side are detachably connected.
[0049] By dividing the pipe body 1 into two shells 11 and hinging the two sides of the same side of the two shells 11, the two shells 11 can be rotated and opened, so as to facilitate the disassembly and installation of the pipe body 1.
[0050] In this embodiment: A guide post 12 coaxial with the marking rod 2 is fixedly connected to the outside of one of the shells 11. A guide hole 121 extending axially and penetrating through the guide post 12 and the outer wall of the corresponding shell 11 in sequence is formed in the guide post 12.
[0051] The marking rod 2 is embedded in the guide hole 121, and a piston 21 is fixedly connected to one end of the marking rod 2 facing the corresponding shell 11. The piston 21 is in sliding and sealing fit with the guide hole 121.
[0052] By arranging a guide post 12 extending radially toward the shell 11 outside one of the shells 11, and forming a guide hole 121 communicating the inside and outside of the pipe body 1 in the guide post 12, and embedding the piston 21 at one end of the marking rod 2 facing the corresponding shell 11 into the guide hole 121 and slidingly fitting, the piston 21 has a long sliding stroke to increase the movement range of the marking rod 2, so as to facilitate observing the position change of the marking rod 2 on the corresponding shell 11.
[0053] In this embodiment: A plurality of metal flakes 22 are arranged on one side of the marking rod 2, and the plurality of metal flakes 22 are uniformly arranged along the axial direction of the marking rod 2.
[0054] The metal flakes 22 are perpendicular to the marking rod 2, and one side edge of the metal flakes 22 is fixedly connected to the marking rod 2.
[0055] A plurality of metal flakes 22 are arranged along the axial direction of the marking rod 2 and uniformly arranged to form a structure similar to a scale. The metal flakes 22 are equivalent to the scale lines on the scale. By reading the number of metal flakes 22 protruding outside the guide hole 121 on the marking rod 2 and the change of the number, relevant information such as whether the chemical pipeline leaks and the leakage speed can be directly obtained.
[0056] In this embodiment: A dial 122 parallel to the metal flakes 22 is arranged on the side of the metal flakes 22 facing away from the marking rod 2. One side edge of the dial 122 is fixedly connected to the inner wall of one end of the guide hole 121 facing away from the corresponding shell 11.
[0057] The other side edge of the dial 122 extends toward the marking post and is inserted into the gap between two adjacent metal flakes 22, and the movement trajectories of the plurality of metal flakes 22 all intersect with the dial 122.
[0058] The metal sheet 22 has a certain elasticity, and the paddle 122 is made of plastic material to prevent sparks from being generated when the metal sheet 22 collides with the paddle 122. The paddle 122 and the metal sheet 22 form a structure similar to a bicycle bell. A bicycle bell usually consists of a metal sheet (or called a bell cover, bell bowl) and a triggering mechanism (such as a spring hammer, gears, etc.). These metal sheets are fixed to a frame, and the triggering mechanism is connected to the handle of the bell. When the cyclist presses or toggles the handle of the bell, the triggering mechanism starts to work. The handle drives the gear to rotate, causing the spring hammer to rotate. The spring hammer then strikes the metal sheet, causing the metal sheet to vibrate. The vibration of the metal sheet causes the surrounding air molecules to vibrate, thereby forming sound waves.
[0059] Among them, the metal sheet 22 is equivalent to the metal sheet, and the paddle 122 is equivalent to the spring hammer. During the movement of the marking rod 2 in the guiding hole 121, when the metal sheet 22 moves to contact and abut against the paddle 122, under the blocking action of the paddle 122, the metal sheet 22 bends and deforms until the metal sheet 22 slides over the paddle 122. The resistance of the paddle 122 to the metal sheet 22 disappears instantly, so that the elastic potential energy of the metal sheet 22 is released instantly, and then the metal sheet 22 vibrates and makes a sound, warning the relevant technical personnel audibly that there is a leakage problem in this section of the chemical pipeline.
[0060] In this embodiment: a chute 23 extending axially is formed on the side wall of the marking rod 2 facing away from the metal sheet 22, a limiting block 123 is arranged in the opening at one end of the guiding column 12 facing away from the corresponding housing 11, one end of the limiting block 123 is fixedly connected to the inner side wall of the guiding hole 121, and the other end is inserted into the chute 23 and is in sliding fit.
[0061] By forming a chute 23 on one side wall of the marking rod 2 and fixedly connecting a limiting block 123 that is in sliding fit with the chute 23 on the inner side wall of the guiding hole 121 to limit the free rotation of the marking rod 2 in the guiding hole 121, when the marking rod 2 slides axially with a single degree of freedom in the guiding hole 121, several metal sheets 22 contact the paddle 122 in sequence and make sounds in sequence, continuously reminding the relevant technical personnel. At the same time, the limiting block 123 blocks the piston 21 to prevent the piston 21 from sliding out and falling off from the opening at one end of the guiding hole 121 facing away from the corresponding housing 11.
[0062] In this embodiment: a compression spring 24 is arranged in the chute 23, one end of the compression spring 24 is fixedly connected to the piston 21, and the other end is fixedly connected to the limiting block 123;
[0063] The axial dimension value of the piston 21 plus the axial dimension value of the marking rod 2 is equal to the axial dimension value of the guiding hole 121, and when the compression spring 24 is in a natural extended state, both the piston 21 and the marking rod 2 are completely embedded in the guiding hole 121.
[0064] The piston 21 is flexibly supported by the set compression spring 24. When a chemical pipeline leaks, the pressure inside the pipe body 1 increases. Under the action of the pressure difference between the inside and outside of the pipeline, the piston 21 slides outward of the pipe body 1, causing the compression spring 24 to be squeezed and contracted. By measuring, the length dimension value of the marked rod 2 sliding out of the opening of the guiding hole 121 is obtained, which is the deformation amount of the compression spring 24, and thus the pressure value received by the compression spring 24 can be obtained. Since the end area of the piston 21 facing one end of the corresponding housing 11 can be measured in advance, and the pressure is equal to the pressure divided by the force-bearing area, the change value of the pressure inside the pipe body 1 can be obtained.
[0065] A pressure relief hole 124 communicating with both the inside and outside of the guiding column 12 is provided in the middle of the side wall of the guiding column 12. When the compression spring 24 is completely squeezed and contracted, the piston 21 just slides past the pressure relief hole 124, making the pressure relief hole 124 communicate with the inside of the pipe body 1, thereby releasing part of the chemical gas collected by the pipe body 1, reducing the pressure inside the pipe body 1. The compression spring 24 releases energy and stretches, pushing the piston 21 and the marked rod 2 to slide toward the housing 11. The metal sheet 22 is blocked again by the dial 122, and a sound is emitted again.
[0066] That is, when there is a leakage in a section of the chemical pipeline covered by the pipe body 1, the piston 21 and the marked rod 2 make a reciprocating linear motion in the guiding hole 121, continuously emitting a warning sound. However, the frequency of the emitted sound varies with the leakage speed of the chemical gas in the chemical pipeline, so as to facilitate relevant technical personnel to obtain information such as whether there is a leakage in the chemical pipeline and the leakage speed of the raw materials.
[0067] In this embodiment: on both sides of the other side of the two housings 11, there are convex blocks 111. One side wall of the convex block 111 is fixedly connected to the outer wall of the corresponding housing 11, and the other side wall extends away from the housing 11;
[0068] On the side walls of the two convex blocks 111 facing away from the corresponding housing 11, there are notches 112. A connecting rod 14 is jointly embedded in the two notches 112. One end of the connecting rod 14 is rotatably connected to the side walls on both sides of one of the notches 112, and the plane of the rotation trajectory is perpendicular to the hinge axis of the two housings 11;
[0069] The other end of the connecting rod 14 is connected with a pressing block 15, and the outer dimension of the pressing block 15 is larger than the dimension of the notch 112.
[0070] In this embodiment: the pressing block 15 is sleeved outside the connecting rod 14 and is connected by a threaded fit.
[0071] One end of the connecting rod 14 is fixedly connected with a perpendicular rotating shaft 141. Both ends of the rotating shaft 141 are respectively inserted into the two side walls of one of the notches 112 and are in rotational fit; an external thread is provided on the outer cylindrical surface of the other end of the connecting rod 14, and the pressing block 15 is strung on the connecting rod 14 and is in threaded fit connection, so that the position of the pressing block 15 on the connecting rod 14 can be changed.
[0072] During use, when it is necessary to fixedly sleeve the two shells 11 on the pipe body 1, the openings at both ends of one of the shells 11 are clamped on the chemical pipeline, the other shell 11 is rotated so that the two shells 11 are sleeved outside the chemical pipeline, the connecting rod 14 is rotated so that the connecting rod 14 is embedded in the two notches 112, and the pressing block 15 is rotated forward so that the pressing block 15 approaches the rotating shaft 141. Furthermore, the pressing block 15 and the rotating shaft 141 jointly squeeze the two convex blocks 111 to clamp and fix the two shells 11, so that the two shells 11 are stably sleeved outside the chemical pipeline.
[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.
Claims
1. A chemical pipeline explosion-proof safety inspection device, characterized by: It comprises a tube body (1) for being sleeved outside a chemical pipeline, wherein both ends of the tube body (1) are sealed with the chemical pipeline, and a sealed chamber is formed between the tube body (1) and the chemical pipeline; A marking rod (2) is arranged outside the tube body (1), one end of the marking rod (2) penetrates through the outer wall of the tube body (1) and is inserted into the sealed chamber, and the marking rod (2) and the outer wall of the tube body (1) are slidably and sealingly matched.
2. The chemical pipeline explosion-proof safety inspection device according to claim 1 is characterized in that: The aperture values of the openings at both ends of the tube body (1) are smaller than the aperture value of the middle portion of the tube body (1).
3. The chemical pipeline explosion-proof safety inspection device according to claim 1 is characterized in that: The tube body (1) is composed of two semi-circular tube-shaped shells (11) spliced together, wherein two sides of the two shells (11) on the same side are hinged, and two sides on the other side are detachably connected.
4. The chemical pipeline explosion-proof safety inspection device according to claim 3 is characterized in that: A guide column (12) coaxial with the marking rod (2) is fixedly connected to the outside of one of the shells (11), and a guide hole (121) extending axially and sequentially penetrating the guide column (12) and the outer wall of the corresponding shell (11) is provided on the guide column (12); The marking rod (2) is embedded in the guide hole (121), and a piston (21) is fixedly connected to one end of the marking rod (2) facing the corresponding housing (11), and the piston (21) is slidably and sealingly matched with the guide hole (121).
5. The chemical pipeline explosion-proof safety inspection device according to claim 4 is characterized in that: A plurality of metal sheets (22) are provided on one side of the marking rod (2), and the plurality of metal sheets (22) are evenly arranged along the axial direction of the marking rod (2); The metal sheet (22) is perpendicular to the marking rod (2), and one side of the metal sheet (22) is fixedly connected to the marking rod (2).
6. The chemical pipeline explosion-proof safety inspection device according to claim 5 is characterized in that: A paddle (122) parallel to the metal sheet (22) is provided on the side of the metal sheet (22) facing away from the marking rod (2), and one side of the paddle (122) is fixedly connected to the inner side wall of one end of the guide hole (121) facing away from the corresponding housing (11); The other side of the paddle (122) extends toward the marking column and is inserted into the gap between two adjacent metal sheets (22), and the movement tracks of a plurality of the metal sheets (22) intersect with the paddle (122).
7. The chemical pipeline explosion-proof safety inspection device according to claim 5 is characterized in that: A sliding groove (23) extending in the axial direction is provided on a side wall of the marking rod (2) facing away from the metal sheet (22); a limiting block (123) is provided in an opening at one end of the guide column (12) facing away from the corresponding shell (11); one end of the limiting block (123) is fixedly connected to the inner wall of the guide hole (121), and the other end is inserted into the sliding groove (23) and slidably matched.
8. The chemical pipeline explosion-proof safety inspection device according to claim 7 is characterized in that: A compression spring (24) is provided in the slide groove (23), one end of the compression spring (24) is fixedly connected to the piston (21), and the other end of the compression spring (24) is fixedly connected to the limit block (123); The axial dimension value of the piston (21) plus the axial dimension value of the marking rod (2) is equal to the axial dimension value of the guide hole (121), and when the compression spring (24) is in a naturally extended state, the piston (21) and the marking rod (2) are completely embedded in the guide hole (121).
9. The chemical pipeline explosion-proof safety inspection device according to claim 3 is characterized by: The two sides of the other side of the two shells (11) are both provided with protrusions (111), one side wall of the protrusion (111) is fixedly connected to the outer wall of the corresponding shell (11), and the other side wall extends in a direction away from the shell (11); A notch (112) is provided on the side wall of the two protrusions (111) facing away from the corresponding shell (11), and a connecting rod (14) is embedded in the two notches (112). One end of the connecting rod (14) is rotatably connected to the two side walls of one of the notches (112), and the plane of the rotation track is perpendicular to the hinge axis of the two shells (11); The other end of the connecting rod (14) is connected to a pressing block (15), and the outer dimensions of the pressing block (15) are larger than the dimensions of the notch (112).
10. The chemical pipeline explosion-proof safety inspection device according to claim 9, characterized in that: The pressing block (15) is sleeved outside the connecting rod (14) and is connected via threaded engagement.