CN111642859A - Protective helmet capable of spraying air - Google Patents
Protective helmet capable of spraying air Download PDFInfo
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- CN111642859A CN111642859A CN202010706097.3A CN202010706097A CN111642859A CN 111642859 A CN111642859 A CN 111642859A CN 202010706097 A CN202010706097 A CN 202010706097A CN 111642859 A CN111642859 A CN 111642859A
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- air
- helmet
- air supply
- pipeline
- supply pipeline
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- A—HUMAN NECESSITIES
- A42—HEADWEAR
- A42B—HATS; HEAD COVERINGS
- A42B3/00—Helmets; Helmet covers ; Other protective head coverings
- A42B3/04—Parts, details or accessories of helmets
- A42B3/28—Ventilating arrangements
- A42B3/281—Air ducting systems
- A42B3/283—Air inlets or outlets, with or without closure shutters
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- Helmets And Other Head Coverings (AREA)
Abstract
The invention relates to a protective helmet capable of spraying air, which comprises a helmet shell, an air inlet pipe and an air supply pipeline, wherein one or more air inlet holes and air outlet holes are formed in the helmet shell, and the air outlet holes are formed in the front end or two side ends of the helmet shell; an air supply pipeline is arranged in the helmet shell, one end of the air supply pipeline is communicated with the air inlet, and the other end of the air supply pipeline is communicated with the air outlet; one end of the air inlet pipe is connected with an external air source, and the other end of the air inlet pipe is connected with the air supply pipeline and sprays air outwards through the air supply pipeline. This helmet can provide reaction force for the pilot helmet, alleviates to a certain extent because the pilot head that gravity and inertial force brought leans forward, and can be for the head heat dissipation, increases the comfort level.
Description
Technical Field
The invention belongs to the technical field of human body protection equipment, and particularly relates to a protective helmet capable of spraying air.
Background
Helmets are very important protective equipment for fighter pilots and are also carriers of various instruments and are worn during flight. When a pilot drives a fighter plane to cruise, carry out heavy overload maneuver, land (ship) and other working conditions, the helmet system (including instruments) is heavy, the gravity center is close to the front, and the extrusion to the head is aggravated under the influence of gravity, so that the problems of head pressure pain, neck fatigue or damage, forward leaning and sliding of the helmet and the like of the pilot can be caused. Particularly, in the process of landing, because the existing carrier aircraft carrier is dependent on the arresting cable in order to avoid accidents when landing, the aircraft still has higher speed before landing and the pilot steps on the accelerator to accelerate, so that the head and the neck of the pilot can be greatly inclined due to inertia factors in the deceleration stage after the arresting cable is hooked, particularly a helmet mask system has heavy damage to the cervical vertebra of the pilot due to large inertia caused by large weight. Meanwhile, the inside of the helmet matched with the pilot for a long time is overheated and sweaty, so that the head of the pilot is uncomfortable. At present, aiming at the problems of helmet extrusion, forward tilt slippage and neck fatigue caused by long-time cruising and large overload of a pilot when the pilot drives a fighter plane, and the problems of forward tilt and cervical vertebra injury caused by inertia of the head and neck of the pilot when a carrier-based aircraft lands on a ship, individual protective equipment, effective means or methods are lacked, most of efforts made on the equipment level are equipment weight reduction and gravity center backward movement, however, due to multi-aspect limitation, the problem improvement condition is limited.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a protective helmet capable of spraying air.
A protective helmet capable of spraying air comprises a helmet shell and an air inlet pipe, wherein one or more air inlet holes and air outlet holes are formed in the helmet shell, and the air outlet holes are formed in the front end or two side ends of the helmet shell; an air supply pipeline is arranged in the helmet shell, one end of the air supply pipeline is communicated with the air inlet, and the other end of the air supply pipeline is communicated with the air outlet; one end of the air inlet pipe is connected with an external air source, and the other end of the air inlet pipe is connected with the air supply pipeline and sprays air outwards through the air supply pipeline.
The air supply pipeline arranged in the helmet shell is formed in the helmet shell and is integrally formed with the helmet shell.
The intake pipe other end can take three kinds of modes to be connected with the air supply line, outwards jets gas through the air supply line, is respectively: the mode is that the air inlet pipe is connected with an air inlet of an air supply pipeline or the inside of the air supply pipeline through a pipeline joint; the air inlet pipe enters the air supply pipeline through the air inlet hole and extends to the air outlet hole; in the third mode, the air inlet pipe enters the air supply pipeline through the air inlet hole, penetrates out of the air outlet hole and extends to the outside of the helmet shell.
The air outlet hole is externally connected with an air outlet pipe.
The top of the helmet shell is provided with a ventilation pipeline or a cavity, and the inner surface of the ventilation pipeline or the cavity is provided with a ventilation channel which is communicated with the inside of the helmet; the helmet is internally provided with a ventilation passage, when the air inlet pipe injects air outwards through the air supply pipeline in a first mode, the ventilation passage is opened inside the helmet shell and integrally formed with the helmet or adopts an independent pipeline, one end of the ventilation passage is connected with the ventilation pipeline or the cavity through a pipeline joint, and the other end of the ventilation passage is communicated with the air supply pipeline through a pipeline joint; when the air inlet pipe adopts a second mode or a third mode to jet air outwards through the air supply pipeline, the air permeable passage adopts an independent pipeline, one end of the air permeable passage is connected with the air vent pipeline or the cavity through a pipeline joint, and the other end of the air permeable passage is connected with the air inlet pipe in the air supply pipeline through a pipeline joint.
And a control device for controlling the cross-sectional area or pressure and flow is arranged in the air outlet hole or the air supply pipeline.
The air supply line may alternatively be provided directly outside the helmet shell.
The invention has the beneficial effects that:
1. the helmet shell is provided with one or more air inlets, and the position is not limited, so the connection mode of the air inlet pipe and the helmet can be a single pipe or a plurality of pipes; the air supply pipeline inside or outside the helmet shell can be a single pipe which is directly communicated to the air outlet holes, or a plurality of air outlet holes which are connected with the air outlet holes can be formed in a dividing way, the positions of the air outlet holes can be changed, and the modes are various;
2. the air supply pipeline can be arranged inside the helmet shell and integrally formed with the helmet shell along the appearance of the helmet shell, and the currently commonly used air inlet pipe is connected to the air inlet hole, the inside of the air supply pipeline and the air outlet hole or extends to the outside of the helmet shell, so that high-pressure air can be drained in a mode of completely utilizing the air supply pipeline or combining the air supply pipeline and the air inlet pipe, the basic layout of the original helmet is not influenced, and the weight and the cost are not increased;
3. the air supply pipeline can be arranged outside the helmet shell, namely the air supply pipeline arranged inside the helmet shell is replaced by the air supply pipeline arranged outside the helmet shell, so that the basic layout of the original helmet is not influenced, and the weight and the cost are not increased;
4. each air outlet can be set to be in a closed or opened state according to the situation, the air outlet pressure can be adjusted to achieve the optimal protection effect, and the problems of extrusion, forward leaning and sliding of a helmet of a pilot, fatigue of the neck and cervical vertebra injury during forward leaning can be relieved to different degrees;
5. the helmet is characterized in that a ventilation pipeline or a cavity is arranged at the top of a helmet shell of the helmet and is communicated with an air supply pipeline, and a ventilation channel is arranged on the inner surface of the ventilation pipeline or the cavity and can be used for dissipating heat of the helmet by introduced air;
6. the helmet can be connected with different air sources, and can be an onboard device or other air sources.
Drawings
Fig. 1 is a front view of a sprayable protective helmet provided in example 1;
FIG. 2 is a top view of FIG. 1
FIG. 3 is a side view of FIG. 1;
FIG. 4 is a side view of the sprayable protective helmet provided in example 2;
FIG. 5 is a side view of the sprayable protective helmet provided in example 3;
FIG. 6 is a side view of the sprayable protective helmet provided in example 4;
wherein:
the helmet comprises a helmet shell, 2 air inlet holes, 3 air outlet holes, 4 air supply pipelines, 5 cavities, 6 ventilation channels, 7 air inlet pipes, 8 pipeline joints, 9 air outlet pipes and 10 ventilation channels.
Detailed Description
For better understanding of the present invention, the technical solutions and effects of the present invention will be described in detail by the following embodiments with reference to the accompanying drawings.
As shown in fig. 1-5, a protective helmet capable of spraying air comprises a helmet shell 1 and an air inlet pipe 7, wherein the helmet shell 1 is provided with one or more air inlet holes 2 and air outlet holes 3, the air outlet holes 3 are arranged at the front end or two side ends of the helmet shell 1, and the positions of the air inlet holes 2 are not limited; an air supply pipeline 4 is arranged in the helmet shell 1, one end of the air supply pipeline 4 is communicated with the air inlet hole 2, and the other end of the air supply pipeline 4 is communicated with the air outlet hole 3, namely, the air inlet hole 2 is an air inlet port of the air supply pipeline 4, and the air outlet hole 3 is an air outlet port of the air supply pipeline 4; one end of the air inlet pipe 7 is connected with an external air source, and the other end of the air inlet pipe is connected with the air supply pipeline 4 and sprays air outwards through the air supply pipeline 4. The air supply pipeline 4 arranged inside the helmet shell 1 is formed inside the helmet shell 1 and is integrally formed with the helmet shell 1.
The other end of the air inlet pipe 7 can be connected with the air supply pipeline 4 in three modes, and the air is sprayed outwards through the air supply pipeline 4, and the three modes are as follows: the mode is that the air inlet pipe 7 is connected with the air inlet hole 2 of the air supply pipeline 4 or the inside of the air supply pipeline 4 through the pipeline joint 8, when the air inlet pipe 7 is connected with the air inlet hole 2 or the inside of the air supply pipeline 4, air enters the air supply pipeline 4 from the air inlet pipe 7 and is sprayed out from the air outlet hole 3; secondly, the air inlet pipe 7 enters the air supply pipeline 4 through the air inlet hole 2 and extends to the air outlet hole 3; the third mode is that the air inlet pipe enters the air supply pipe through the air inlet hole, penetrates out of the air outlet hole and extends to the outside of the helmet shell; when the air inlet pipe 7 injects air outwards through the air supply pipe 4 in the second mode or the third mode, that is, when the air inlet pipe 7 extends from the inside of the air supply pipe 4 to the air outlet hole 3 or the outside of the helmet shell 1, the air supply pipe 4 serves as a guide path of the air inlet pipe 7 and guides the air to flow, and the air is sprayed out from an outlet of the air inlet pipe 7. Because the air outlet holes 3 are formed at the front end or two side ends of the helmet shell 1, air can be sprayed forwards, downwards or in the direction between the front end and the two sides, and counterforce is provided for the helmet of a pilot.
Preferably, the air outlet hole 3 is externally connected with an air outlet pipe 9 as an extension of the air supply pipeline 4, at this time, the other end of the air inlet pipe 7 can extend to an air outlet of the air outlet pipe 9 or penetrate out of the air outlet pipe 9 to extend outside the helmet shell 1, and air is sprayed out of the air outlet pipe 9.
The air supply pipeline 4 arranged inside the helmet shell 1 can be replaced by arranging the air supply pipeline 4 outside the helmet shell 1, so that the direction of air injection is ensured to face to the front side, the lower side or the direction between the front side and the lower side of the helmet shell 1, and the counterforce is provided for the helmet of a pilot.
As a preferable technical scheme, the top of the helmet shell 1 is provided with a ventilation pipeline or cavity 5, and the inner surface of the ventilation pipeline or cavity 5 is provided with a ventilation channel 6 communicated with the interior of the helmet; the ventilation channel 6 can be in various shapes including ventilation holes, ventilation grooves and ventilation seams; the inside of the helmet is provided with a ventilation passage 10, when the air inlet pipe 7 injects air outwards through the air supply pipeline 4 in a first mode, the ventilation passage 10 is opened inside a helmet shell and integrally formed with the helmet or adopts an independent pipeline, one end of the ventilation passage is connected with the ventilation pipeline or the cavity 5 through a pipeline joint 8, and the other end of the ventilation passage is communicated with the air supply pipeline 4 through the pipeline joint 8; when the air inlet pipe 7 injects air outwards through the air supply pipeline 4 in the second mode or the third mode, the air permeable passage 10 adopts an independent pipeline, one end of the air permeable passage is connected with the air vent pipeline or the cavity 5 through the pipeline joint 8, and the other end of the air permeable passage is connected with the air inlet pipe 7 in the air supply pipeline 4 through the pipeline joint 8. The ventilation pipeline or the cavity 5 is communicated with the air supply pipeline 4 through the ventilation passage 10, and air in the air supply pipeline 4 is sprayed into the ventilation pipeline or the cavity 5 simultaneously and sprayed into the helmet shell 1 from the ventilation passage 6, so that the head of a pilot is cooled, and the comfort level is increased.
Preferably, a control device for controlling the cross-sectional area, the pressure and the flow rate is arranged in the air outlet 3 or the air supply pipeline 4.
The air supply pipeline 4 can be directly arranged outside the helmet shell and can be arranged inside the helmet shell 1 and integrated with the helmet, the independent pipeline is directly arranged outside the helmet, the air injection direction is ensured to face to the front side, the lower side or the direction between the front side and the lower side of the helmet shell 1, and the counterforce is provided for the helmet of a pilot.
Example 1
In order to clearly show the structure of the helmet, the present embodiment provides a form of a protection helmet capable of spraying air, as shown in fig. 1-3, the positions of the air inlet holes 2 are selectively opened on the lower end surface of the rear portion of the helmet shell 1, the air outlet holes 3 are opened on the two side surfaces of the front portion of the helmet shell 1, the air outlet direction faces the front of the helmet shell 1 and obliquely downward at a certain angle with the horizontal direction, the left and right sides of the helmet shell 1 are respectively provided with air supply pipes 4, the air supply pipes 4 are opened inside the helmet shell 1 and are integrally formed with the helmet shell 1, as shown in fig. 3, the air inlet pipe 7 in the present embodiment adopts a mode that air is sprayed outwards through the air supply pipe 4, and one end of the air inlet pipe 7; the other end of the air inlet pipe 7 is connected with an air source, air enters the air inlet pipe 7 and is guided along the air supply pipeline 4, and the air outlet holes 3 are formed in the two side faces of the front portion of the helmet shell 1 in the embodiment, so that the air is sprayed out through the air outlet holes 3 at last, the angle adjusting device is arranged at the air outlet holes through the air outlet holes, the air spraying direction of the air outlet holes 3 is manually adjusted, the air spraying direction of the air outlet holes is controlled, the sprayed air provides reaction force for the helmet, and the forward tilting of the head of a pilot caused by gravity and inertia force is relieved to.
Preferably, the top of the helmet shell 1 is provided with a ventilation pipeline or a cavity 5, the cavity 5 is provided in the embodiment, the inner surface of the cavity 5 is provided with a ventilation channel 6, and the ventilation channel 6 is a ventilation hole; because the air inlet pipe 7 adopts the mode that one air is sprayed outwards through the air supply pipeline 4, the air ventilation passage 10 is opened inside the helmet shell 1 and integrally formed with the helmet, the cavity 5 is communicated with the air supply pipeline 4 through the air ventilation passage 10, high-pressure air in the air supply pipeline 4 is sprayed into the cavity 5 at the same time, and is sprayed into the helmet shell 1 from the air ventilation passage 6 of the cavity 5, so that the head of a pilot is cooled, and the comfort level is increased.
The use method of the sprayable protective helmet comprises the following steps: when a pilot drives a fighter plane to cruise, and the like, or a carrier-based aircraft lands on a ship, the air source is started, so that high-pressure air is sprayed into the air supply pipeline 4 through the air inlet pipe 7 and the air inlet holes 2 and is sprayed out through the air outlet holes 3 to form upward and backward reaction force, the inertia force and the gravity on the head of the pilot are reduced to a certain extent, and the cervical vertebra is protected.
Example 2
The difference between the present embodiment and the present embodiment lies in the position and number of the air inlet holes 2 being different, and in the present embodiment, a form of the protection helmet capable of spraying air is provided, as shown in fig. 4, the air inlet holes 2 are formed on the curved surface and the lower end surface of the rear portion of the helmet shell 1, the air outlet holes 3 are formed on the two side surfaces of the front portion of the helmet shell 1, the air outlet direction faces the front of the helmet shell 1 and is obliquely downward at a certain angle with the horizontal direction, air supply pipelines 4 are respectively provided on the left and right sides of the helmet shell 1, the air supply pipelines 4 are arranged inside the helmet shell 1 and are integrally formed with the helmet shell 1, as shown in fig. 4, in the present embodiment, the air inlet pipe 7 is used to inject air outwards through the air supply pipeline 4; the other end of the air inlet pipe 7 is connected with an air source, air enters the air inlet pipe 7 and is guided along the air supply pipeline 4, and the air outlet holes 3 are formed in the two side faces of the front portion of the helmet shell 1 in the embodiment, so that the air is sprayed out through the air outlet holes 3 at last, the angle adjusting device is arranged at the air outlet holes through the air outlet holes, the air spraying direction of the air outlet holes 3 is manually adjusted, the air spraying direction of the air outlet holes is controlled, the sprayed air provides reaction force for the helmet, and the forward tilting of the head of a pilot caused by gravity and inertia force is relieved to.
Preferably, the top of the helmet shell 1 is provided with a ventilation pipeline or a cavity 5, the cavity 5 is provided in the embodiment, the inner surface of the cavity 5 is provided with a ventilation channel 6, and the ventilation channel 6 is a ventilation hole; because the air inlet pipe 7 adopts the mode that one air is sprayed outwards through the air supply pipeline 4, the air ventilation passage 10 is opened inside the helmet shell 1 and integrally formed with the helmet, the cavity 5 is communicated with the air supply pipeline 4 through the air ventilation passage 10, high-pressure air in the air supply pipeline 4 is sprayed into the cavity 5 at the same time, and is sprayed into the helmet shell 1 from the air ventilation passage 6 of the cavity, so that the head of a pilot is cooled, and the comfort level is increased.
The use method of the sprayable protective helmet comprises the following steps: when a pilot drives a fighter plane to cruise, and the like, or a carrier-based aircraft lands on a ship, the air source is started, so that high-pressure air is sprayed into the air supply pipeline 4 through the air inlet pipe 7 and the air inlet holes 2 and is sprayed out through the air outlet holes 3 to form upward and backward reaction force, the inertia force and the gravity on the head of the pilot are reduced to a certain extent, and the cervical vertebra is protected.
Example 3
The difference between the present embodiment and embodiment 1 is that the positions and the number of the air intake holes 2 are different, as shown in fig. 5, the positions of the air intake holes 2 in the present embodiment are opened on the lower end surface of the rear portion of the helmet shell 1, and the rest of the arrangement and the working principle and method are the same as those in embodiments 1 and 2.
Example 4
The difference between this embodiment and embodiment 3 lies in venthole 3 department is external to have outlet duct 9, the air injection mode when having outlet duct 9 is taken to inlet duct 7 this moment, inlet duct 7 passes through air supply pipe 4 and outlet duct 9 inside from inlet port 2 in proper order, extend to the exit of outlet duct 9, and the position and the quantity of venthole 3 are different, as shown in fig. 6, the position of inlet port 2 is opened on the lower terminal surface at helmet casing 1 rear portion in this embodiment, venthole 3 is opened at the anterior both sides face of helmet casing 1, venthole 3 department is external to have outlet duct 9, as the extension of air supply pipe 4, inlet duct 7 extends to the exit of outlet duct 9 along air supply pipe 4 always, gaseous export blowout from outlet duct 9, the jet-propelled direction is forward. The ventilation passage 10 in this embodiment is an independent pipe, one end of which is connected to the ventilation pipe 4 or the cavity 5 through a pipe joint 8, and the other end of which is connected to an air inlet pipe 7 in the air supply pipe through the pipe joint 8. The rest of the arrangement and the working principle and method are the same as the other embodiments.
In order to better provide counterforce for a pilot when the head of the pilot tilts downwards, the air inlet holes 2 can be opened at any position of the helmet shell 1, a plurality of air outlet holes 3 can be arranged at the same time, the air outlet holes 3 are opened at the front end or two side ends of the helmet shell 1, a plurality of air outlet holes 3 with different air outlet angles can be arranged, the air spraying directions of the air outlet holes 3 can be ensured to face the front and the lower parts of the helmet, and the counterforce in the upward direction and the backward direction can be formed. Various combinations of the number and positions of the air outlet holes 3 and the air inlet holes 2 are also included in the scope of the present invention.
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the invention.
Claims (7)
1. A sprayable protective helmet, comprising: the helmet comprises a helmet shell and an air inlet pipe, wherein one or more air inlet holes and air outlet holes are formed in the helmet shell, and the air outlet holes are formed in the front end or two side ends of the helmet shell; an air supply pipeline is arranged in the helmet shell, one end of the air supply pipeline is communicated with the air inlet, and the other end of the air supply pipeline is communicated with the air outlet; one end of the air inlet pipe is connected with an external air source, and the other end of the air inlet pipe is connected with the air supply pipeline and sprays air outwards through the air supply pipeline.
2. The sprayable protective helmet of claim 1, wherein: the air supply pipeline arranged in the helmet shell is formed in the helmet shell and is integrally formed with the helmet shell.
3. The sprayable protective helmet of claim 1, wherein: the other end of the air inlet pipe is provided with three modes for injecting air outwards through an air supply pipeline: the mode is that the air inlet pipe is connected with an air inlet of an air supply pipeline or the inside of the air supply pipeline through a pipeline joint; the air inlet pipe enters the air supply pipeline through the air inlet hole and extends to the air outlet hole; in the third mode, the air inlet pipe enters the air supply pipe through the air inlet hole, penetrates out of the air outlet hole and extends to the outside of the helmet shell.
4. The sprayable protective helmet of claim 1, wherein: the air outlet hole is externally connected with an air outlet pipe.
5. A sprayable protective helmet according to claim 3 or 4, wherein: the top of the helmet shell is provided with a ventilation pipeline or a cavity, and the inner surface of the ventilation pipeline or the cavity is provided with a ventilation channel which is communicated with the inside of the helmet; the helmet is internally provided with a ventilation passage, when the air inlet pipe injects air outwards through the air supply pipeline in a first mode, the ventilation passage is opened inside the helmet shell and integrally formed with the helmet or adopts an independent pipeline, one end of the ventilation passage is connected with the ventilation pipeline or the cavity through a pipeline joint, and the other end of the ventilation passage is communicated with the air supply pipeline through a pipeline joint; when the air inlet pipe adopts a second mode or a third mode to jet air outwards through the air supply pipeline, the air permeable passage adopts an independent pipeline, one end of the air permeable passage is connected with the air vent pipeline or the cavity through a pipeline joint, and the other end of the air permeable passage is connected with the air inlet pipe in the air supply pipeline through a pipeline joint.
6. The sprayable protective helmet of claim 1, wherein: and a control device for controlling the cross-sectional area or pressure and flow is arranged in the air outlet hole or the air supply pipeline.
7. The sprayable protective helmet of claim 1, wherein: the air supply line may alternatively be provided directly outside the helmet shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010706097.3A CN111642859A (en) | 2020-07-21 | 2020-07-21 | Protective helmet capable of spraying air |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010706097.3A CN111642859A (en) | 2020-07-21 | 2020-07-21 | Protective helmet capable of spraying air |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111642859A true CN111642859A (en) | 2020-09-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010706097.3A Pending CN111642859A (en) | 2020-07-21 | 2020-07-21 | Protective helmet capable of spraying air |
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| Country | Link |
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| CN (1) | CN111642859A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114568785A (en) * | 2022-02-15 | 2022-06-03 | 南昌工程学院 | Safety helmet for engineering construction entrance |
-
2020
- 2020-07-21 CN CN202010706097.3A patent/CN111642859A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114568785A (en) * | 2022-02-15 | 2022-06-03 | 南昌工程学院 | Safety helmet for engineering construction entrance |
| CN114568785B (en) * | 2022-02-15 | 2023-10-10 | 江西正德工程检测有限公司 | Safety helmet for engineering construction entrance |
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