Nonmetal pipeline geometric deformation internal detector with automatic blockage removing function

Abstract

The invention relates to the technical field of pipeline geometric deformation inner detectors, in particular to a non-metal pipeline geometric deformation inner detector with an automatic blockage removing function, which comprises a self-adaptive module, the self-adaptive module comprises a head mandrel, a first leather cup is used for being in contact with and sealing the inner circumferential wall of a pipeline, and a second leather cup is used for being in contact with and sealing the inner circumferential wall of the pipeline. A first cavity and a second cavity which are separated from each other are formed in the front portion and the rear portion of the first leather cup, the first leather cup is provided with an auxiliary supporting mechanism which is used for making contact with the inner circumferential wall of the pipeline all the time and sealing the inner circumferential wall of the pipeline when the first leather cup deforms, and in use, the self-adaption module and the detection module can change along with changes of the pipeline when moving in the pipeline. The self-adaption module and the detection module are separated from each other to prevent the detector from being blocked, the two ends of the restoration mechanism are always connected to the self-adaption module and the detection module, the restoration mechanism can restore to the initial state under the assistance of the restoration mechanism, the blocking state of the detector in the pipeline is automatically relieved, and the applicability of the detector under the complex working condition is improved.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline geometric deformation internal detectors, in particular to a non-metallic pipeline geometric deformation internal detector with an automatic jam-releasing function. Background Art

[0002] Non-metallic pipes are widely used in oil and gas transportation due to their corrosion resistance, low friction, and energy saving. However, due to third-party damage, geological subsidence, and other reasons, pipe interfaces are prone to misalignment and pipe bodies are prone to deformation, leading to pipeline leakage and more serious fire and explosion accidents. Therefore, it is urgent to carry out deformation detection of non-metallic pipes.

[0003] At the same time, before conducting pipeline corrosion inspection, pipeline deformation inspection must be carried out first, that is, the deformation degree and position of straight pipe sections, elbows, miter joints and welds must be inspected. Only after confirming that the pipeline has good internal detector passing performance can the corrosion internal detector be deployed. However, the deformation of the pipeline is unknown before the geometric deformation internal detector is deployed. Once the geometric deformation internal detector is blocked in the pipeline, it may cause the pipeline to stop transporting, or even require the pipe to be cut off to remove the internal detector. Therefore, the pipeline geometric deformation detector needs higher passing performance in conditions prone to blocking.

[0004] In addition, most of the existing pipeline geometric deformation internal detectors are designed for steel pipelines, and the detection arm is in rigid contact with the pipeline wall, which is easy to scratch the pipeline wall and cause pipeline scratches, damaging the pipeline body; at the same time, the design of the existing pipeline geometric deformation internal detector does not fully consider the passing performance of the internal detector at elbows and deformations, and it is still easy to get stuck when used, especially in the field of non-metallic pipeline deformation detection. There are few related geometric deformation internal detectors on the market. In view of this, the present invention provides a non-metallic pipeline geometric deformation internal detector with a blocking condition adaptive function. Summary of the invention

[0005] The technical problem to be solved by the present invention is: in order to solve the problem that most of the existing pipeline geometric deformation internal detectors are designed for steel pipelines, the detection arm is in rigid contact with the pipeline wall, which is easy to scratch the pipe wall and cause pipeline scratches, damaging the pipeline body. The design of the pipeline geometric deformation internal detector does not fully consider the passing performance of the internal detector at elbows and deformations, and it is still easy to get stuck during use. Especially in the field of non-metallic pipeline deformation detection, there are few related geometric deformation internal detectors on the market. Now a non-metallic pipeline geometric deformation internal detector with an automatic unblocking function is provided.

[0006] The technical solution adopted by the present invention to solve its technical problem is: a non-metallic pipe geometric deformation internal detector with an automatic unblocking function, including an adaptive module, the adaptive module including a head core shaft, a first leather cup is arranged on the head core shaft, the first leather cup is used to contact and seal with the inner circumferential wall of the pipe, so as to form a first cavity and a second cavity separated from each other in front and behind the first leather cup, the first leather cup is provided with an auxiliary support mechanism for it to always contact and seal with the inner circumferential wall of the pipe when deformed, the head core shaft is provided with a first pressure relief hole for connecting the first cavity and the second cavity, and the first pressure relief hole is provided with a control mechanism for controlling the opening of the pressure relief hole and realizing speed control;

[0007] and a detection module, the detection module comprising a base, a power supply battery and a communication mechanism connected to an external device are arranged on the base, a second leather cup is arranged on the base, a detection mechanism is arranged between the second leather cup and the base, the communication mechanism is respectively connected to the detection mechanism and the control mechanism by signal, the power supply battery is respectively connected to the detection mechanism, the communication mechanism and the control mechanism, the second leather cup is used to contact the inner circumferential wall of the pipeline to realize forming a third cavity and a fourth cavity separated from each other by the front and back of the second leather cup, the second cavity and the third cavity are located between the first cavity and the fourth cavity, and the second cavity The first and second cavities are connected to each other, and the second pressure relief hole for connecting the third cavity and the fourth cavity is arranged on the base. A connecting hole is arranged at one end of the base close to the head core shaft, and the connecting hole is a frustum. The large end of the connecting hole is close to the head core shaft, and the connecting hole is arranged along the axial direction of the pipeline. One end of the head core shaft matches the connecting hole, and one end of the head core shaft is arranged in the connecting hole. A recovery mechanism is arranged between one end of the head core shaft and the base, and the recovery mechanism is used to assist one end of the head core shaft to be inserted into the connecting hole after one end of the head core shaft is separated from the connecting hole. Compared with the prior art, the adaptive module and the detection module in this scheme can change with the change of the pipeline when they are displaced in the pipeline, and the adaptive module and the detection module are disengaged from each other to prevent the detector from being blocked. The two ends of the recovery mechanism are always connected to the adaptive module and the detection module, and can be restored to the initial state with the assistance of the recovery mechanism, so as to automatically release the state of the detector being blocked in the pipeline, and improve the applicability of the detector under complex working conditions.

[0008] In order to realize the recovery mechanism, some embodiments are preferred, wherein the recovery mechanism includes a first spring, one end of which is fixed on the base, the other end of which is fixed on the head core shaft, and the first spring is located in the connecting hole. The recovery mechanism is the first spring, and since the spring itself has a certain elastic deformation capacity, it is stretched when the first spring is disengaged, and at the same time, the first spring recovers after the jam is removed. Since the spring is a common part, it is easy to purchase and easy to maintain later.

[0009] In order to realize the first leather cup, some preferred embodiments include a first fixed leather cup, which is annular and fixed on the outer circumferential surface of the head core shaft, and the outer ring of the first fixed leather cup is connected to a first sealing leather cup, which is an annular structure.

[0010] In order to realize the auxiliary support mechanism, in some preferred embodiments, the auxiliary support mechanism includes a second spring, one end of the second spring is fixed to the first fixed leather cup, and the other end of the second spring is fixed to the first sealing leather cup.

[0011] In order to realize the control mechanism, some embodiments are preferred, wherein the control mechanism includes a cover plate and a stopper, wherein the cover plate covers the first pressure relief hole at one end of the first cavity, a through hole is provided on the cover plate, and the through hole is used to connect the first cavity and the first pressure relief hole, and a driving mechanism for driving the stopper to move and make the stopper block or open the through hole is provided on the head core shaft. The driving mechanism drives the stopper to move, and can make the stopper block a part of the through hole, or not block the through hole, or completely block the through hole, so as to realize through holes with different openings, thereby controlling the amount of gas from the second cavity to the first cavity, and realizing the control of the displacement speed of the detector in the pipeline.

[0012] In some preferred embodiments, the cover plate has a plurality of through holes evenly and spaced apart in a circumferential direction, and the stoppers are arranged corresponding to the through holes.

[0013] In order to realize the second leather cup, in some preferred embodiments, the second leather cup includes a second sealing leather cup, the second sealing leather cup is an annular structure, and the second sealing leather cup is fixed on the outer peripheral surface of the base.

[0014] In order to realize the detection mechanism, some preferred embodiments include a plurality of detection arms, which are evenly distributed along the circumferential direction of the base, one end of the detection arm is hinged on the base, and the other end of the detection arm is against the position where the second sealing leather cup contacts the pipe, and the second sealing leather cup is located between the pipe and the other end of the detection arm, and a third spring is arranged between each detection arm and the base.

[0015] In order to prevent the detector from damaging its internal components when passing through an elbow, in some preferred embodiments, an anti-collision head is provided on the head core shaft to prevent the detector from damaging its internal components when passing through an elbow or at an excessively fast speed.

[0016] In some preferred embodiments, the anti-collision head is located at the front end of the displacement direction of the head core shaft, and the anti-collision head is made of explosion-proof metal or explosion-proof polyurethane material.

[0017] The beneficial effects of the present invention are as follows: when the non-metallic pipeline geometric deformation internal detector with the automatic unblocking function is in use, the adaptive module and the detection module can change with the change of the pipeline when they are displaced in the pipeline, the adaptive module and the detection module are disengaged from each other to prevent the detector from being blocked, and can be restored to the initial state with the assistance of the recovery mechanism. At the same time, the two ends of the recovery mechanism are always connected to the adaptive module and the detection module, so as to realize the automatic unblocking of the detector in the pipeline, improve the applicability of the detector under complex working conditions, and avoid the existing pipeline geometric deformation internal detectors. Most of them are designed for steel pipelines, the detection arm is in rigid contact with the pipeline wall, which is easy to scratch the pipe wall and cause pipeline scratches, damaging the pipeline body, and the design of the pipeline geometric deformation internal detector does not fully consider the passing performance of the internal detector at elbows and deformations, and it is still easy to get stuck when in use, especially in the field of non-metallic pipeline deformation detection, there are few related geometric deformation internal detectors on the market. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0019] Figure 1 The three-dimensional structure of the present invention is shown in FIG. Figure 1 ;

[0020] Figure 2 The three-dimensional structure of the present invention is shown in FIG. Figure 2 ;

[0021] Figure 3 It is a front view of the present invention;

[0022] Figure 4 is a top view of the present invention;

[0023] Figure 5 is a bottom view of the present invention;

[0024] Figure 6 yes Figure 4 Middle AA section view;

[0025] Figure 7 It is a structural schematic diagram of the control mechanism in the present invention.

[0026] In the figure: 1, adaptive module, 101, head mandrel, 102, first leather cup, 1021, first fixed leather cup, 1022, first sealing leather cup, 103, auxiliary support mechanism, 104, first pressure relief hole, 105, control mechanism, 1051, cover plate, 1052, stopper, 1053, through hole;

[0027] 2. Detection module, 201. base, 202. second leather cup, 203. second pressure relief hole, 204. connection hole, 205. recovery mechanism, 206. detection mechanism, 2061. detection arm, 2062. third spring;

[0028] 3. Prevent head collision. DETAILED DESCRIPTION

[0029] The present invention is further described in detail below in conjunction with embodiments:

[0030] The present invention is not limited to the following specific embodiments. A person skilled in the art can implement the present invention in various other specific embodiments according to the contents disclosed in the present invention, or any simple changes or modifications made to the design structure and ideas of the present invention fall within the protection scope of the present invention. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention 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 understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0033] like Figure 1-7As shown, a non-metallic pipe geometric deformation internal detector with an automatic unblocking function includes an adaptive module 1, the adaptive module 1 includes a head core shaft 101, a first leather cup 102 is arranged on the head core shaft 101, the first leather cup 102 is used to contact and seal with the inner circumferential wall of the pipe, so as to form a first cavity and a second cavity separated from each other before and after the first leather cup 102, an auxiliary support mechanism 103 is arranged on the first leather cup 102 so that it can always contact and seal with the inner circumferential wall of the pipe when deformed, a first pressure relief hole 104 for connecting the first cavity and the second cavity is arranged on the head core shaft 101, and a control mechanism 105 for controlling the opening of the pressure relief hole and realizing speed control is arranged in the first pressure relief hole 104;

[0034] And a detection module 2, the detection module 2 includes a base 201, a power supply battery and a communication mechanism connected to an external device are arranged on the base 201, a second leather cup 202 is arranged on the base 201, a detection mechanism 206 is arranged between the second leather cup 202 and the base 201, the communication mechanism is respectively connected to the detection mechanism 206 and the control mechanism 105 for signal, the power supply battery is respectively connected to the detection mechanism 206, the communication mechanism and the control mechanism 105, the second leather cup 202 is used to contact the inner wall of the pipeline, so as to form a third cavity and a fourth cavity separated from each other before and after the second leather cup 202, the second cavity and the third cavity are located between the first cavity and the fourth cavity, the second cavity and the third cavity are connected to each other, and a communication mechanism for connecting the second leather cup 202 to the base 201 is provided. The third chamber and the fourth chamber are connected to a second pressure relief hole 203, and a connecting hole 204 is provided at one end of the base 201 close to the head core shaft 101. The connecting hole 204 is in a cone shape, and the large end of the connecting hole 204 is close to the head core shaft 101. The connecting hole 204 is arranged along the axial direction of the pipeline, and one end of the head core shaft 101 matches the connecting hole 204. One end of the head core shaft 101 is arranged in the connecting hole 204, and a restoring mechanism 205 is provided between one end of the head core shaft 101 and the base 201. The restoring mechanism 205 is used to keep the head core shaft 101 connected to the base 201 at all times, and can assist one end of the head core shaft 101 to be inserted into the connecting hole 204 after one end of the head core shaft 101 is detached from the connecting hole 204.

[0035] The restoring mechanism 205 includes a first spring, one end of which is fixed on the base 201 , the other end of which is fixed on the head core shaft 101 , and the first spring is located in the connecting hole 204 .

[0036] The first leather cup 102 includes a first fixed leather cup 1021, which is annular and fixed on the outer circumferential surface of the head core shaft 101. The outer ring of the first fixed leather cup 1021 is connected to the first sealing leather cup 1022. The first sealing leather cup 1022 is an annular structure. The auxiliary support mechanism 103 includes a second spring, one end of the second spring is fixed on the first fixed leather cup 1021, and the other end of the second spring is fixed on the first sealing leather cup 1022. The material of the first leather cup 102 is a highly wear-resistant and highly elastic polyurethane material.

[0037] The control mechanism 105 includes a cover plate 1051 and a stopper 1052. The cover plate 1051 covers the first pressure relief hole 104 at one end of the first cavity. A through hole 1053 is opened on the cover plate 1051. The through hole 1053 is used to connect the first cavity and the first pressure relief hole 104. A driving mechanism for driving the stopper 1052 to move and block or open the through hole 1053 is provided on the head core shaft 101. In this embodiment, the driving mechanism is a motor. A plurality of through holes 1053 are evenly distributed and spaced apart in a circumferential direction on the cover plate 1051, and the stopper 1052 is arranged corresponding to the through hole 1053.

[0038] The second leather cup 202 includes a second sealing leather cup, which is an annular structure and is fixed on the outer circumferential surface of the base 201. The detection mechanism 206 includes a plurality of detection arms 2061 and a data acquisition card. The plurality of detection arms 2061 are evenly distributed along the circumferential direction of the base 201. One end of the detection arm 2061 is hinged on the base 201, and the other end of the detection arm 2061 is arranged against the position where the second sealing leather cup contacts the pipeline. The second sealing leather cup is located between the pipeline and the other end of the detection arm 2061. A third spring 2062 is arranged between each detection arm 2061 and the base 201. The data acquisition card is used to collect pipeline deformation information detected by the detection arm 2061.

[0039] The head core shaft 101 is provided with an anti-collision head 3 for preventing the detector from damaging its internal components when the detector speed is too fast or passes through a bend. The anti-collision head 3 is located at the front end of the displacement direction of the head core shaft 101 and is made of explosion-proof metal or explosion-proof polyurethane.

[0040] To use the detector, follow these steps:

[0041] S1. Place the detector in the valve chamber through a portable ball launcher;

[0042] S2, the detector is driven to move by the driving pressure difference formed by the first leather cup 102 on the detector, and at the same time, the displacement speed of the detector is realized and kept stable by the control mechanism 105;

[0043] S3, the detector moves continuously along the pipeline along with the medium in the pipeline, and uses the swingable detection arm 2061 on the detection mechanism 206 to record the change of the angle between the detection arm 2061 and the pipeline axis, so as to obtain the distance between the deformation detection arm 2061 and the pipe wall when it is pressed down or relaxed, and then calculate the deformation size. At the same time, the ultra-low frequency transmitter of the communication mechanism communicates with the outside of the pipeline to realize the movement mileage positioning of the detector;

[0044] S4. Recover the detector in the valve chamber through a portable ball collecting cylinder, and import the data in the data acquisition card in the detection mechanism 206 on the detector into a computer for data analysis.

[0045] When the non-metallic pipeline geometric deformation internal detector with automatic unblocking function is used, due to the medium transported in the pipeline, such as natural gas or water, the detector is placed in the pipeline in the initial state, and the first leather cup 102 is interference-fitted with the inner wall of the pipeline and sealed to form a driving pressure difference, so that the detector can be self-driven.

[0046] When the diameter of the pipeline suddenly increases, the pressure in the first cavity in front of the detector will decrease instantly, and the first leather cup 102 will be blocked by the auxiliary support mechanism 103, or when the pipeline geometric deformation detector is blocked at the elbow, the driving pressure difference of the detector before and after the first leather cup 102 will increase, that is, the pressure difference between the first cavity and the second cavity will increase. Since the detector is blocked and cannot move, the pressure of the first leather cup 102 in the second cavity will continue to increase under the action of the medium in the pipeline. The first leather cup 102 will be pulled out of the connecting hole 204, and the adaptive module 1 will be displaced in the pipeline, and the detection module 2 behind will be driven by the recovery mechanism 205 to enter the blocked part of the pipeline. When the detector passes through the pipeline jam, After being blocked, under the action of the first spring in the restoration mechanism 205, one end of the head core shaft 101 is inserted into the connecting hole 204, so that the adaptive module 1 and the detection module 2 are restored to the initial state, and the adaptation of different pipe deformation sizes is realized. At the same time, the detection arm 2061 drives the second leather cup 202 to contact and detect the inner wall of the pipe under the action of the third spring 2062. Since the control mechanism 105 is set at the first pressure relief hole 104, the control mechanism 105 controls the opening of the pressure relief hole. Therefore, the first pressure relief hole 104 forms a pressure difference between the first cavity and the second cavity, and the pressure difference can drive the detector to move in the pipeline. There are no components at the second pressure relief hole 203, so the pressures between the second cavity, the third cavity and the fourth cavity are basically the same.

[0047] The above-mentioned ideal embodiments of the present invention are for inspiration. Through the above-mentioned description, relevant staff can make various changes and modifications without departing from the technical idea of ​​the present invention. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A non-metallic pipeline geometric deformation internal detector with automatic jam-releasing function, characterized in that: The adaptive module includes a head core shaft, a first leather cup is arranged on the head core shaft, the first leather cup is used to contact and seal with the inner circumferential wall of the pipe, so as to form a first cavity and a second cavity separated from each other in the front and back of the first leather cup, an auxiliary support mechanism is arranged on the first leather cup so that it can always contact and seal with the inner circumferential wall of the pipe when deformed, a first pressure relief hole is arranged on the head core shaft for connecting the first cavity and the second cavity, and a control mechanism for controlling the opening of the pressure relief hole and realizing speed control is arranged in the first pressure relief hole; and a detection module, the detection module comprising a base, a power supply battery and a communication mechanism connected to an external device are arranged on the base, a second leather cup is arranged on the base, a detection mechanism is arranged between the second leather cup and the base, the communication mechanism is respectively connected to the detection mechanism and the control mechanism by signal, the power supply battery is respectively connected to the detection mechanism, the communication mechanism and the control mechanism, the second leather cup is used to contact the inner peripheral wall of the pipeline to realize forming a third cavity and a fourth cavity separated from each other by the front and back of the second leather cup, the second cavity and the third cavity are located between the first cavity and the fourth cavity, and the second cavity and the third cavity are connected to each other A second pressure relief hole for connecting the third chamber and the fourth chamber is provided on the base, a connecting hole is provided at one end of the base close to the head core shaft, the connecting hole is frustum-shaped, the large end of the connecting hole is close to the head core shaft, the connecting hole is arranged along the axial direction of the pipeline, one end of the head core shaft matches the connecting hole, one end of the head core shaft is arranged in the connecting hole, a recovery mechanism is provided between one end of the head core shaft and the base, the recovery mechanism is used to keep the head core shaft connected to the base at all times, and can assist one end of the head core shaft to be inserted into the connecting hole after one end of the head core shaft is detached from the connecting hole.

2. The non-metallic pipeline geometric deformation internal detector with automatic jam-releasing function according to claim 1 is characterized in that: The restoring mechanism comprises a first spring, one end of which is fixed on the base, the other end of which is fixed on the head core shaft, and the first spring is located in the connecting hole.

3. The non-metallic pipeline geometric deformation internal detector with automatic jam-releasing function according to claim 1, characterized in that: The first leather cup includes a first fixed leather cup, which is annular and fixed on the outer peripheral surface of the head core shaft. The outer ring of the first fixed leather cup is connected to a first sealing leather cup, and the first sealing leather cup is an annular structure.

4. The non-metallic pipeline geometric deformation internal detector with automatic jam-releasing function according to claim 3 is characterized in that: The auxiliary support mechanism comprises a second spring, one end of the second spring is fixed on the first fixed leather cup, and the other end of the second spring is fixed on the first sealing leather cup.

5. The non-metallic pipeline geometric deformation internal detector with automatic jam-releasing function according to claim 1, characterized in that: The control mechanism includes a cover plate and a stopper, wherein the cover plate covers the first pressure relief hole at one end of the first cavity, a through hole is opened on the cover plate, and the through hole is used to connect the first cavity and the first pressure relief hole, and a driving mechanism for driving the stopper to move and make the stopper block or open the through hole is arranged on the head core shaft.

6. The non-metallic pipeline geometric deformation internal detector with automatic jam-releasing function according to claim 4, characterized in that: The cover plate is provided with a plurality of through holes evenly and spaced apart in the circumferential direction, and the stoppers are arranged corresponding to the through holes.

7. The non-metallic pipeline geometric deformation internal detector with automatic jam-releasing function according to claim 1, characterized in that: The second leather cup includes a second sealing leather cup, the second sealing leather cup is an annular structure, and the second sealing leather cup is fixed on the outer peripheral surface of the base.

8. The non-metallic pipeline geometric deformation internal detector with automatic jam-releasing function according to claim 7, characterized in that: The detection mechanism includes a plurality of detection arms, which are evenly distributed along the circumferential direction of the base. One end of the detection arm is hinged on the base, and the other end of the detection arm is arranged at a position where the second sealing leather cup contacts the pipeline. The second sealing leather cup is located between the pipeline and the other end of the detection arm, and a third spring is arranged between each detection arm and the base.

9. The non-metallic pipeline geometric deformation internal detector with automatic jam-releasing function according to claim 1, characterized in that: The head core shaft is provided with an anti-collision head for preventing the detector from damaging its internal parts when the detector is too fast or passes through a bend.

10. The non-metallic pipeline geometric deformation internal detector with automatic jam-releasing function according to claim 9, characterized in that: The anti-collision head is located at the front end of the displacement direction of the head core shaft, and the material of the anti-collision head is explosion-proof metal or explosion-proof polyurethane material.

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