Visual field detection method and device suitable for helmets of different specifications

Abstract

The invention relates to a visual field detection method suitable for helmets of different specifications, which comprises the following steps: firstly, calibrating the relative horizontal positions of a head mold and a detection cover, and secondly, adjusting the distance between an upper emitter and a lower emitter on the head mold and the distance between the top of the head mold and the upper emitter according to the helmets of different specifications; thirdly, the position of a lower receiver on the detection cover is determined according to the position of a lower transmitter on the head mold; then, the helmet is fixed to the head mold, and the head mold carries the helmet to move to a set position in the direction of the detection cover; and the upper and lower visual fields and the left and right visual fields of the helmet are detected. When the helmet is detected, the position between the head mold for placing the helmet and the detection cover is calibrated, so that the accuracy and the stability of detection are ensured. Meanwhile, the detection position of the lower visual field is adjusted according to the helmets of different specifications, and the helmets of five different specifications can be detected by adopting one head mold and one detection cover. Therefore, the rapidness and the high efficiency of detection are improved.

Description

Technical Field

[0001] The invention relates to the technical field of helmet vision detection, and in particular to a method and a device for detecting the vision of helmets of different specifications. Background Art

[0002] A helmet is a head protection device. The size of the field of vision after wearing the helmet can directly affect the wearer's ability to observe the environment. In some special dangerous situations, a small field of vision after wearing a helmet may lead to mistakes at work or even life-threatening situations. Therefore, detecting the size of the helmet field of vision is an indispensable part of the helmet production process. According to the requirements of the national standard GB 811-2022, helmets are divided into five specifications according to the head circumference size: extra small, small, medium, large, and extra large. The extra small head circumference size is 500-540MM. The extra large head circumference is 620-660MM. At the same time, the lower field of vision detection position of helmets of different specifications is different. That is, the distance (x) between the reference plane and the base plane recorded in the national standard GB 811-2022 is different. At the same time, the distance (y) from the top of the head mold to the reference plane is also different. Although the existing helmet field of vision detection instrument can detect the field of vision of the helmet, it is necessary to replace the head mold and the detection cover when facing helmets of different specifications to achieve the detection effect.

[0003] For example, a Chinese patent with publication number CN221100041 U discloses a helmet visual field tester, which relates to the technical field of helmet visual field testing, including: a machine base, a head mold moving mechanism arranged on the machine base, and a test bench, wherein the test bench is provided with an arc bow rotating mechanism and three test arc bows connected to the arc bow rotating mechanism, and the test arc bow is equipped with a plurality of light receivers, and the head mold moving mechanism is provided with a detachable head mold, and the head mold is provided with a first light source and a second light source both facing the test arc bow, and the test bench is provided with a touch screen and a central data processor for receiving the light source signal detected by the light receiver. This application can replace test head molds of different sizes according to the use requirements of helmets of different specifications, better simulate the state of normal wearing of helmets, and improve the accuracy of test data. The above technical solutions also have the same problems.

[0004] For example, a Chinese patent with publication number CN115211804A discloses a method, device, system and computer-readable storage medium for testing the visual field of a helmet. The method includes the following steps: S1, setting the head of the tester at a preset position inside the helmet, and constructing a three-dimensional coordinate system with the position of the tester's brow as the origin, wherein the X direction is the front-to-back direction, the Y direction is the left-to-right direction, and the Z direction is the up-down direction; S2, setting the position of the brow as the first test point, and setting multiple second test points at the preset position outside the helmet. When testing the upper and lower visual fields and the horizontal visual field, the corresponding second test point moves from back to front. When the second test point enters the tester's line of sight, the spatial position of the second test point and the corresponding first test point in the three-dimensional coordinate system is recorded and connected; S3, the upper and lower visual field values ​​and the horizontal visual field values ​​are calculated respectively by the connection in step S2 and the angles of the XZ plane and the XY plane in the three-dimensional coordinate system. The method for testing the visual field of a helmet according to the present invention has the advantage of more accurate test results. The detection method adopted in the above technical solution is a three-coordinate detection method, which has relatively high requirements on the three-coordinate operators and can only realize random inspection of batches of helmets.

[0005] For example, a Chinese patent with publication number CN117870604A discloses a comprehensive tester and test method for the visual field and protection area of ​​a helmet safety helmet, which belongs to the technical field of the visual field and protection area test of a helmet safety helmet, including a base, a head mold, and a control display. The surface of the head mold is provided with a reference mark; a mounting frame installed on the top of the base, and the head mold is arranged on the inner side of the mounting frame; a movable support assembly installed on the top of the base; the present invention is provided with a movable visual field test assembly, which can be used for visual field tests for helmet safety helmets of different models. Through the setting of the angle sensor, the visual field angle value of the helmet safety helmet can be accurately tested and intuitively displayed through the control display. In addition, four groups of laser transmitters are provided in the device, and the protective area of ​​the helmet safety helmet is tested using a four-station cross cursor, which can project and map the protective area of ​​the 360° curved surface of the helmet safety helmet at one time, and the test efficiency is relatively high. In the above scheme, the helmet is scanned and detected by adjusting the height of the head mold and the position of the visual field test assembly. At that time, helmets of different specifications had different head circumferences. In order to ensure the stability of the helmet on the head mold, it was also necessary to replace head molds with different head circumferences to achieve the stability of the helmet on the head circumference. Summary of the invention

[0006] The purpose of the present invention is to provide a method and device for detecting the visual field of helmets of different specifications, so as to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above purpose, the technical solution adopted by the present invention is: a method for detecting the visual field of helmets of different specifications, including upper and lower transmitters and left and right transmitters arranged on the head mold, and upper and lower receivers and left and right receivers arranged on the detection cover. The upper and lower transmitters and the upper and lower receivers cooperate to detect the upper and lower visual fields of the helmet, and the left and right transmitters and the left and right receivers cooperate to detect the left and right visual fields of the helmet. The specific detection steps are as follows:

[0008] First, the relative horizontal position of the headform and the detection cover is calibrated using the horizontal transmitter installed on the headform and the horizontal receiver installed on the detection cover.

[0009] Secondly, adjust the distance between the upper emitter and the lower emitter on the headform and the distance between the top of the headform and the upper emitter according to the different specifications of the helmets;

[0010] Again, the head mold moves to the set position in the direction of the detection cover, and the position of the lower receiver on the detection cover is determined according to the position of the lower transmitter on the head mold; after the position of the lower receiver on the detection cover is confirmed, the head mold returns to the original position;

[0011] Then, the helmet is fixed on the headform, and the headform carries the helmet and moves to the set position in the direction of the detection cover;

[0012] Finally, the upper transmitter, lower transmitter, left transmitter and right transmitter arranged on the head mold send out detection signals at the same time, and the corresponding receivers on the detection cover receive the detection signals; when the receiver on the detection cover receives the corresponding signal, it means that the field of view of the helmet is qualified, and when one or more of the receivers do not receive the detection signal, it means that the field of view of the helmet is unqualified.

[0013] Compared with the existing technology, the position between the helmet head mold and the detection cover is first placed for calibration before the helmet is tested to ensure the accuracy and stability of the test. At the same time, the detection position of the lower field of view is adjusted according to the different specifications of the helmets. With one head mold and one detection cover, five different specifications of helmets can be tested. This improves the speed and efficiency of the test.

[0014] The present invention also provides a visual field detection device suitable for helmets of different specifications; comprising a support plate and a detection cover fixedly mounted on the support plate, a head mold for fixing the helmet is arranged on one side of the detection cover, and the head mold is slidably mounted on the support plate;

[0015] The head mold includes a lower mold and a middle mold. The lower mold is fixedly installed on the bottom plate. An expansion part for fixing the head circumference of the helmet is arranged between the lower mold and the middle mold. The middle mold is fixedly installed on the head circumference expansion part. A supporting part for supporting the top of the helmet is arranged on the top of the middle mold.

[0016] As a preferred technical solution of the invention, the expansion part includes a circular cavity arranged on the top of the lower mold and a driving shaft rotatably installed in the lower mold, a driving disk is fixedly installed on the driving shaft, the driving disk is located in the circular cavity, a number of arc-shaped driving grooves are evenly distributed on the driving disk, a track disk is fixedly installed on the top of the lower mold, the track disk is provided with sliding grooves with the same number as the driving grooves, a sliding block is slidably arranged in the sliding groove, a driving rod is fixedly installed on the sliding block, and the end of the driving rod passes through the track disk and is located in the driving groove; each sliding groove is threadedly connected to a connecting rod arranged parallel to the sliding groove, and a fixing ring is fixedly connected to the end of the connecting rod.

[0017] As a preferred technical solution of the invention, the supporting part includes a rotating shaft rotatably installed in the middle mold and a square hole arranged in the middle mold, the rotating shaft is provided with a driving thread, the driving thread is located in the square hole and is connected to a driving nut, and two fixing rods are symmetrically installed on the driving nut, and the ends of the fixing rods pass through the top of the middle mold and are fixedly connected to the supporting points.

[0018] As a preferred technical solution of the invention, mounting holes are provided on the top of the track disk and the top of the middle mold, rolling bearings are installed in the mounting holes, the rotating shaft is installed on the two rolling bearings, a through hole is provided at the center of the driving shaft, and the end of the rotating shaft extends through the through hole to the outside of the lower driving shaft.

[0019] As a preferred technical solution of the invention, an upper detection point and a lower detection point are arranged on the lower die, the upper detection point is located directly below the top surface of the lower die, the lower detection point is arranged directly below the upper detection point, and the lower detection point is movably arranged on the lower die; a driving hole is vertically arranged in the lower die and a moving screw rod is rotatably installed, a nut adapted to the moving screw rod is arranged in the driving hole, the nut is located in the driving hole, and a long hole connected to the driving hole is arranged on the lower die, and the lower detection point passes through the long hole and is fixedly connected to the nut.

[0020] As a preferred technical solution of the invention, an upper transmitter is installed on the upper detection point, and a lower transmitter is installed on the lower detection point; a left transmitter and a right transmitter are installed in the vertical direction between the upper detection point and the lower detection point.

[0021] As a preferred technical solution of the invention, a bracket is provided at the bottom of the detection cover, the bracket is fixedly mounted on the support plate, a fixed point is provided on the bracket, a positioning point matching the fixed point is installed on the bottom of the head mold; the positioning point and the connecting line of the upper emitter and the lower emitter coincide with the extension line in the vertical direction; a horizontal receiver is installed on the detection cover, the horizontal receiver and the upper detection point on the head mold are on the same horizontal plane, and a horizontal emitter matching the horizontal receiver is installed on the upper detection point.

[0022] As a preferred technical solution of the invention, an upper receiver adapted to the upper transmitter is arranged in the detection cover; a movable groove is arranged in the vertical direction in the detection cover, a sliding plate is slidably installed in the movable groove, a driving screw adapted to the upper transmitter is rotatably installed in the movable groove, a lower receiver adapted to the upper transmitter is installed on the sliding plate, and when the driving screw rotates, the sliding plate is driven to move up and down in the movable groove.

[0023] As a preferred technical solution of the invention, a left receiver adapted to the left transmitter and a right receiver adapted to the right transmitter are installed in the detection cover. The left receiver and the left transmitter are on the same horizontal plane and are used to detect the left viewing angle of the helmet; the right receiver and the right transmitter are on the same horizontal plane and are used to detect the right viewing angle of the helmet.

[0024] In addition to the technical problems solved by the present invention, the technical features that constitute the technical solution, and the advantages brought by the technical features of the technical solution described above, other technical problems that can be solved by the present invention, other technical features included in the technical solution, and the advantages brought by these technical features will be further described in detail in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a three-dimensional schematic diagram of the present invention.

[0026] Figure 2 It is a cross-sectional view of the lower mold of the present invention.

[0027] Figure 3 It is a cross-sectional view of the mold in the present invention.

[0028] Figure 4 It is the front view of the drive disk of the present invention.

[0029] Figure 5 It is the front view of the track disk of the present invention.

[0030] Figure 6 It is a cross-sectional view of the detection cover of the present invention.

[0031] Explanation of the reference numerals: 01, support plate; 02, detection cover; 03, head mold; 05, bottom plate; 06, lower mold; 07, middle mold; 08, circular cavity; 09, fixing hole; 10, driving shaft; 11, driving disk; 12, driving groove; 13, track disk; 14, sliding groove; 15, guide groove; 16, slider; 17, driving rod; 18, connecting rod; 19, fixing ring; 20, mounting hole; 21, square hole; 22, rotating shaft; 23, through hole; 24, driving thread; 25, driving Nut; 26, fixing rod; 27, supporting point; 28, upper detection point; 29, lower detection point; 30, driving hole; 31, moving screw rod; 32, nut; 33, long hole; 34, left transmitter; 35, right transmitter; 36, horizontal receiver; 37, horizontal transmitter; 38, upper receiver; 39, bracket; 40, fixing point; 41, positioning point; 42, moving slot; 43, sliding plate; 44, lower receiver; 45, driving screw rod; 47, left receiver; 48, right receiver. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0033] See also Figure 1-6 As shown, the helmet vision detection device of the present invention comprises a support plate 01 and a hemispherical detection cover 02 fixedly mounted on the support plate 01, a head mold 03 for fixing the helmet is arranged on one side of the detection cover 02, a bottom plate 05 is fixedly mounted on the bottom of the head mold 03, and the bottom plate 05 and the support plate 01 are slidably connected via a sliding guide rail. A cylinder is fixedly mounted on the support plate 01, and the output end of the cylinder is fixedly connected to the bottom plate 05. When the cylinder is working, the head mold 03 is driven to move toward or away from the detection cover 02.

[0034] The head mold 03 includes a lower mold 06 and a middle mold 07. The lower mold 06 is fixedly mounted on the bottom plate 05. An expansion part for fixing the head circumference of the helmet is arranged between the lower mold 06 and the middle mold 07. The middle mold 07 is fixedly mounted on the head circumference expansion part. A support part for supporting the top of the helmet is arranged on the top of the middle mold 07.

[0035] See also Figure 2 , 4As shown in Figures 5 and 6, the expansion portion includes a circular cavity 08 disposed on the top of the lower mold 06. A fixing hole 09 is disposed on the lower mold 06 along the central axis of the circular cavity 08. The fixing hole 09 is coaxially disposed with the circular cavity 08 and is connected through the fixing hole 09. The fixing hole 09 extends downward along the central axis of the head mold 03 and penetrates the lower mold 06. A driving shaft 10 is rotatably mounted in the fixing hole 09 via a rolling bearing. One end of the driving shaft 10 is located in the circular cavity 08, and the other end of the driving shaft 10 extends to the outside of the lower mold 06. A driving disk 11 is fixedly mounted on the driving shaft 10. The driving disk 11 is located in the circular cavity 08. When the driving shaft 10 rotates, it drives the driving disk 11 to rotate in the circular cavity 08. A plurality of arc-shaped driving grooves 12 are evenly distributed on the driving disk 11. The present application provides eight driving grooves 12 (such as Figure 4 As shown in the figure, a track plate 13 is fixedly installed on the top of the lower mold 06, and the diameter of the track plate 13 is smaller than the diameter of the top surface of the lower mold 06. The track plate 13 is provided with the same number of sliding grooves 14 as the driving grooves 12, and the bottom of the sliding groove 14 is provided with a guide groove 15 that penetrates the track plate 13. A slider 16 is slidably arranged in the sliding groove 14, and a driving rod 17 is fixedly installed on the slider 16. The end of the driving rod 17 passes through the guide groove 15 and is located in the driving groove 12. When the driving shaft 10 rotates, it drives the driving plate 11 to rotate in the circular cavity 08. During the rotation of the driving plate 11, the driving rod 17 is driven to move in the guide groove 15 through the driving groove 12 on the driving plate 11, and the driving rod 17 thereby drives the slider 16 to move in the sliding groove 14. A connecting rod 18 that is also arranged parallel to the sliding groove 14 is threadedly connected to each sliding groove 14, and a fixing ring 19 is fixedly connected to the end of the connecting rod 18. The fixing ring 19 is made of plastic or rubber. When the helmet is put on the head mold 03 , the fixing ring 19 contacts the inner wall of the helmet, thereby fixing the helmet on the head mold 03 .

[0036] See also Figure 3As shown, the above-mentioned middle mold 07 is fixedly mounted on the track plate 13 by fasteners, and the support part includes mounting holes 20 set on the top of the track plate 13 and the top of the middle mold 07, a square hole 21 penetrating the middle mold 07 is set between the two mounting holes 20, a rolling bearing is installed in the mounting hole 20, a rotating shaft 22 is rotatably installed between the two rolling bearings, a through hole 23 is set on the center of the driving shaft 10, and the end of the rotating shaft 22 passes through the through hole 23 and extends to the outside of the lower driving shaft 10. A driving thread 24 is set on the rotating shaft 22, and the driving thread 24 is located in the square hole 21 and connected to a driving nut 25. The shape of the driving nut 25 is adapted to the square hole 21 and is slidably connected in the square hole 21. When the rotating shaft 22 rotates, the square hole 21 prevents the driving nut 25 from rotating with the rotating shaft 22, but drives the driving nut 25 to move up and down along the square hole 21 through the driving thread 24. Two fixing rods 26 are symmetrically mounted on the driving nut 25. The ends of the fixing rods 26 pass through the top of the middle mold 07 and are fixedly connected to the supporting point 27 through fasteners. The supporting point 27 is made of the same material as the fixing ring 19. The rotating shaft 22 is driven to rotate by an external driving source. Since the rotating shaft 22 is provided with a driving thread 24, the driving thread 24 drives the driving nut 25 to move toward the driving disk 11, so that the supporting point 27 abuts against the top of the middle mold 07.

[0037] According to the requirements of national standard GB 811-2022, helmets are divided into five specifications according to the head circumference size: extra small, small, medium, large, and extra large. The extra small head circumference size is 500-540MM. The extra large head circumference is 620-660MM. Therefore, it is necessary to prepare multiple head molds 03 to adapt to head molds 03 of different specifications during the field of vision detection of the helmet. And during the use of this application, when it is necessary to inspect the extra small size helmet. The drive shaft 10 is driven to rotate clockwise by an external drive source, and the drive disk 11 in the lower mold 06 drives the sliding block to move in the sliding groove 14 toward the center of the drive disk 11, so that the fixing ring 19 connected to the sliding block is flush with the outer surface of the lower mold 06.

[0038] At the same time, the external driving source drives the rotating shaft 22 to rotate. Since the rotating shaft 22 is provided with a driving thread 24, the driving thread 24 drives the driving nut 25 to move toward the driving disk 11, so that the supporting point 27 abuts against the top of the middle mold 07. The helmet of extra small size is fixed. The lower edge of the fixing ring 19 (that is, the top surface of the lower mold 06) is flush with the lower edge of the protection zone of the extra small size helmet.

[0039] When it is necessary to fix the extra-large helmet, firstly, the rotating shaft 22 is driven to rotate by an external driving source, and the driving nut 25 on the rotating shaft 22 is moved upward in the square hole 21 of the middle mold 07 by a set distance, where the set distance is set according to the requirements of the national standard GB 811-2022, and then the extra-large helmet is placed on the head mold 03 to abut against the support point 27. Then, the driving shaft 10 is driven counterclockwise by an external driving source to drive the fixing ring 19 to move away from the center of the head mold 03 in the horizontal direction to fix the helmet. Make the lower edge of the fixing ring 19 (that is, the top surface of the lower mold 06) flush with the lower edge of the protection zone of the extra-large helmet

[0040] An upper detection point 28 and a lower detection point 29 are provided on the lower die 06. The upper detection point 28 is located directly below the top surface of the lower die 06 and is set at a fixed distance. The distance here is set according to the national standard GB 811-2022, specifically 12.7MM. A lower detection point 29 is provided directly below the upper detection point 28, and the lower detection point 29 is movably provided on the lower die 06. A driving hole 30 is vertically provided in the lower die 06, and a moving screw 31 is provided in the driving hole 30. The moving screw 31 is rotatably installed in the lower die 06 through a rolling bearing, and the end of the moving screw 31 extends to the bottom of the lower die 06 and outside the lower die 06. A nut 32 adapted to the movable screw rod 31 is provided in the driving hole 30, and a long hole 33 connected to the driving hole 30 is provided on the lower mold 06. The lower detection point 29 passes through the long hole 33 and is fixedly connected to the nut 32. When the external driving source drives the movable screw rod 31 to rotate, the lower detection point 29 is driven to move up and down through the nut 32.

[0041] When a helmet of extra small size is fixed on the head mold 03, the moving screw 31 drives the lower detection point 29 to move upward, so that the distance between the center of the lower detection point 29 and the top surface of the upper mold meets the requirements of the national standard GB 811-2022. Therefore, when helmets of different specifications are placed on the head mold 03, the external driving source drives the lower detection point 29 to move to the corresponding external position through the moving screw 31. The distance from the lower detection point 29 to the top surface of the lower mold 06 is set according to the requirements of the national standard GB 811-2022.

[0042] It should be noted that the top surface of the lower mold 06 described in this application is equivalent to the auxiliary plane recorded in the national standard GB 811-2022, the upper detection point 28 is equivalent to the reference plane, and the lower detection point 29 is equivalent to the base plane.

[0043] See also Figure 1As shown, an upper transmitter is installed on the upper detection point 28, and a lower transmitter is installed on the lower detection point 29. A left transmitter 34 and a right transmitter 35 are installed vertically between the upper detection point 28 and the lower detection point 29. The upper transmitter is set at 7° with the upper detection point 28, and the lower transmitter is set at 45° with the lower detection point 29. The installation angles of the left transmitter 34 and the right transmitter 35 and the vertical connection line of the upper detection point 28 and the lower detection point 29 are both 105°. This complies with the provisions of the national standard GB 811-2022. Therefore, the upper transmitter and the lower transmitter are used to detect the upper and lower fields of view of the helmet, and the left transmitter 34 and the right transmitter 35 are used to detect the left and right fields of view of the helmet.

[0044] A bracket 39 is provided at the bottom of the detection cover 02, and the bracket 39 is fixedly mounted on the support plate 01. A fixing point 40 is provided on the bracket 39, and a positioning point 41 matching the fixing point 40 is installed at the bottom of the head mold 03. The positioning point 41 coincides with the extension line of the connection line between the upper emitter and the lower emitter in the vertical direction.

[0045] See also Figure 1 As shown, a horizontal receiver 36 is installed on the detection cover 02 , and the horizontal receiver 36 and the upper detection point 28 on the head mold 03 are on the same horizontal plane. A horizontal transmitter 37 adapted to the horizontal receiver 36 is installed on the upper detection point 28 .

[0046] Before the helmet is tested, the horizontal transmitter 37 on the upper test point 28 is matched with the horizontal receiver installed on the test cover 02 to ensure that the test reference of the head mold 03 and the test cover 02 are on the same plane. Since the upper test point 28 is set according to the lower edge of the helmet protection zone, the upper horizontal transmitter 37 on the head mold 03 and the horizontal receiver 36 on the test cover 02 are used to calibrate the positions of the head mold 03 and the test cover 02.

[0047] An auxiliary point is set at the intersection of the horizontal extension line of the horizontal receiver 36 and the vertical extension line of the fixed point 40, when the positioning point 41 on the head mold 03 abuts against the fixed point 40 on the bracket 39. This ensures that the emission point on the head mold 03 and the auxiliary point coincide, thereby ensuring the accuracy during detection.

[0048] The auxiliary point is used as the origin and rotated upward by 7° to form a ray. An upper receiver 38 adapted to the upper transmitter is arranged at the intersection of the ray and the detection cover 02. The upper field of view of the helmet is detected by the cooperation of the upper transmitter and the upper receiver 38, so that the edge extension line of the upper receiver 38 is set at 7° with the extension line of the horizontal receiver 36. At the same time, multiple upper receivers 38 can be arranged on the detection cover 02, and the upper receiver 38 adjacent to the horizontal receiver is set at 7° with the horizontal receiver 36, while the angle between the other upper receivers 38 and the horizontal receiver 36 is greater than 7°.

[0049] Since the position of the horizontal receiver 36 remains fixed during the detection process, the upper field of view of the helmet is detected through the cooperation of the upper receiver 38 and the upper transmitter on the head mold 03.

[0050] See also Figure 6 As shown, according to the provisions of the national standard GB 811-2022, it can be known that the vertical distance from the base plane to the reference plane on helmets of different specifications is different. Therefore, in order to meet the detection of helmets of different specifications, a moving groove 42 is provided in the vertical direction in the detection cover 02, and a sliding plate 43 is slidably installed in the moving groove 42. The sliding plate 43 is installed with a lower receiver 44 adapted to the lower transmitter, and the lower transmitter and the lower receiver 44 are matched to realize the detection of the lower visual field of the helmet. The lower receiver 44 is set at 45° with the sliding plate 43. A driving screw 45 with the sliding plate 43 is rotatably installed in the moving groove 42 through a bearing, and the end of the driving screw 45 extends directly below the upper detection cover. When the driving screw 45 rotates, the driving sliding plate 43 moves up and down in the moving groove 42. Thereby driving the lower receiver 44 to move up and down in the detection groove. Thereby, the lower visual field of the helmet is measured and detected by the lower receiver 44 and the lower transmitter installed on the head mold 03.

[0051] When in use, according to the different specifications of helmets, the lower detection point 29 on the lower mold 06 is moved to a set position. Then the head mold is moved to the set position in the direction of the detection cover. Then the lower transmitter on the lower detection point 29 sends a detection signal, and then the driving source on the detection cover 02 drives the lower receiver 44 to move up and down, and the lower receiver 44 stops moving after the lower receiver 44 receives the detection signal emitted by the lower transmitter. Thereby, the position of the lower receiver 44 on the detection cover 02 is determined. When multiple lower receivers 44 are arranged on the sliding plate 43, the lower receiver 44 adjacent to the horizontal receiver stops moving after receiving the detection signal emitted by the lower transmitter, thereby determining the position of the lower receiver 44 on the detection cover 02.

[0052] The central axis of the detection cover 02 is used as the rotation center. A left receiver 47 is arranged at 105° to the left, and a right receiver 48 is arranged at 105° to the right. The left receiver 47 and the left transmitter 34 on the head mold 03 are on the same horizontal plane and are used to detect the left viewing angle of the helmet. The right receiver 48 and the right transmitter 35 on the head mold 03 are on the same horizontal plane and are used to detect the right viewing angle of the helmet. At the same time, multiple right receivers 48 and left receivers 47 can be arranged on the detection cover 02. The right receiver 48 and the left receiver 47 adjacent to the horizontal receiver are arranged at 105° to the horizontal receiver 36, respectively, and the other right receivers 48 and left receivers 47 are arranged at an angle greater than 105° to the horizontal receiver 36.

[0053] It should be noted that the driving sources are all servo motors, and other devices in the prior art can also be used to act on corresponding parts to make them work.

[0054] When using this application to test very small size helmets,

[0055] First, the head mold 03 and the detection cover 02 are calibrated using the horizontal transmitter 37 (reference plane) on the head mold 03 and the horizontal receiver 36 on the detection cover 02 to ensure that the upper detection point 28 on the head mold 03 and the auxiliary point in the detection cover 02 are on the same straight line.

[0056] Secondly, the driving source on the lower mold 06 drives the corresponding moving screw 31 to rotate, and the moving screw 31 rotates to drive the lower emitter (lower field of view detection point) to move toward the upper emitter (upper field of view detection point), so that the distance from the lower emitter to the upper emitter meets the provisions of the national standard GB 811-2022, and the specific distance is 24MM. At the same time, the driving source in the support part drives the corresponding rotating shaft 22 to rotate, thereby driving the support point 27 at the top of the middle mold 07 to move up and down, so that the distance from the vertex of the support point 27 (the vertex of the head mold 03) to the top surface of the lower mold 06 (the lower edge of the helmet protection zone) meets the provisions of the national standard GB 811-2022, and the specific distance is 90MM. This ensures that the lower edge of the helmet protection zone is flush with the top surface of the active upper mold.

[0057] Next, the head mold 02 moves toward the detection cover 02, so that the positioning point 41 on the head mold 03 and the fixed point 40 on the bracket 39 abut against each other, and the lower detection point 29 on the lower mold 06 is moved to a set position according to different specifications of helmets. The lower transmitter on the lower detection point 29 sends a detection signal, and then the driving source on the detection cover 02 drives the lower receiver 44 to move up and down. When the lower receiver 44 receives the detection signal emitted by the lower transmitter, the lower receiver 44 stops moving. After determining the position of the lower receiver 44 on the detection cover 02, the head mold 02 returns to its original position.

[0058] Then, the operator places the helmet on the head mold 03, so that the helmet is placed on the support point 27 on the head mold 03, and the driving source in the expansion part drives the corresponding driving shaft 10 to rotate, and the driving shaft 10 rotates to drive the fixing ring 19 to fix the helmet through the driving disk 11. The helmet is fixed by matching the supporting point 27 and the fixing ring 19. The head mold 03 is driven by the cylinder to move toward the detection cover 02, so that the positioning point 41 on the bottom of the head mold 03 abuts against the fixed point 40 in the detection cover 02.

[0059] Finally, the upper transmitter, lower transmitter, left transmitter, and right transmitter 35 set on the head mold 03 send out detection signals at the same time, and the corresponding receivers on the detection cover 02 receive the detection signals. When the receiver on the detection cover 02 receives the corresponding signal, it means that the vision of the helmet is qualified. When one or more of the receivers do not receive the detection signal, it means that the vision of the helmet is unqualified.

[0060] When using this application to test extra large size helmets,

[0061] First, the head mold 03 and the detection cover 02 are calibrated using the horizontal transmitter 37 on the head mold 03 and the horizontal receiver 36 on the detection cover 02 to ensure that the upper detection point 28 on the head mold 03 and the auxiliary point in the detection cover 02 are on the same straight line.

[0062] Secondly, the driving source on the lower mold 06 drives the corresponding moving screw 31 to rotate, and the moving screw 31 rotates to drive the lower emitter (lower field of view detection point) to move toward the upper emitter (upper field of view detection point), so that the distance from the lower emitter to the upper emitter meets the provisions of the national standard GB 811-2022, and the specific distance is 30MM. At the same time, the driving source in the support part drives the corresponding rotating shaft 22 to rotate, thereby driving the support point 27 at the top of the middle mold 07 to move up and down, so that the distance from the vertex of the support point 27 (the vertex of the head mold 03) to the top surface of the lower mold 06 (the lower edge of the helmet protection zone) meets the provisions of the national standard GB 811-2022, and the specific distance is 110MM. This ensures that the lower edge of the helmet protection zone is flush with the top surface of the active upper mold.

[0063] Next, the head mold 02 moves toward the detection cover 02, so that the positioning point 41 on the head mold 03 and the fixed point 40 on the bracket 39 abut against each other, and the lower detection point 29 on the lower mold 06 is moved to a set position according to different specifications of helmets. The lower transmitter on the lower detection point 29 sends a detection signal, and then the driving source on the detection cover 02 drives the lower receiver 44 to move up and down. When the lower receiver 44 receives the detection signal emitted by the lower transmitter, the lower receiver 44 stops moving. After determining the position of the lower receiver 44 on the detection cover 02, the head mold 02 returns to its original position.

[0064] Then, the operator places the helmet on the head mold 03, so that the helmet is placed on the support point 27 on the head mold 03, and the driving source in the expansion part drives the corresponding driving shaft 10 to rotate, and the driving shaft 10 rotates to drive the fixing ring 19 to fix the helmet through the driving disk 11. The helmet is fixed by matching the supporting point 27 and the fixing ring 19. The head mold 03 is driven by the cylinder to move toward the detection cover 02, so that the positioning point 41 on the bottom of the head mold 03 abuts against the fixed point 40 in the detection cover 02.

[0065] Finally, the upper transmitter, lower transmitter, left transmitter, and right transmitter 35 set on the head mold 03 send out detection signals at the same time, and the corresponding receivers on the detection cover 02 receive the detection signals. When the receiver on the detection cover 02 receives the corresponding signal, it means that the vision of the helmet is qualified. When one or more of the receivers do not receive the detection signal, it means that the vision of the helmet is unqualified.

[0066] If the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0067] The above implementation modes are merely descriptions of the preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary engineering and technical personnel in the field shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A method for detecting the visual field of helmets of different specifications, comprising an upper and lower transmitter, and a left and right transmitter arranged on a head mold, and an upper and lower receiver and a left and right receiver arranged on a detection cover. The upper and lower transmitters and the upper and lower receivers cooperate to detect the upper and lower visual fields of the helmet, and the left and right transmitters and the left and right receivers cooperate to detect the left and right visual fields of the helmet, characterized in that: The specific detection steps are as follows: First, the relative horizontal position of the headform and the detection cover is calibrated using the horizontal transmitter installed on the headform and the horizontal receiver installed on the detection cover. Secondly, adjust the distance between the upper emitter and the lower emitter on the headform and the distance between the top of the headform and the upper emitter according to the different specifications of the helmets; Again, the head mold moves to the set position in the direction of the detection cover, and the position of the lower receiver on the detection cover is determined according to the position of the lower transmitter on the head mold; after the position of the lower receiver on the detection cover is confirmed, the head mold returns to the original position; Then, the helmet is fixed on the headform, and the headform carries the helmet and moves to the set position in the direction of the detection cover; Finally, the upper transmitter, lower transmitter, left transmitter and right transmitter arranged on the head mold send out detection signals at the same time, and the corresponding receivers on the detection cover receive the detection signals; when the receiver on the detection cover receives the corresponding signal, it means that the field of view of the helmet is qualified, and when one or more of the receivers do not receive the detection signal, it means that the field of view of the helmet is unqualified.

2. A device for detecting the visual field of helmets of different specifications, applied to the method for detecting the visual field of helmets of different specifications as claimed in claim 1, characterized in that: It includes a support plate and a detection cover fixedly mounted on the support plate, a head mold for fixing a helmet is arranged on one side of the detection cover, and the head mold is slidably mounted on the support plate; The head mold includes a lower mold and a middle mold. The lower mold is fixedly installed on the bottom plate. An expansion part for fixing the head circumference of the helmet is arranged between the lower mold and the middle mold. The middle mold is fixedly installed on the head circumference expansion part. A supporting part for supporting the top of the helmet is arranged on the top of the middle mold.

3. The visual field detection device applicable to helmets of different specifications according to claim 2 is characterized in that: The expansion part includes a circular cavity arranged on the top of the lower mold and a driving shaft rotatably installed in the lower mold, a driving disk is fixedly installed on the driving shaft, the driving disk is located in the circular cavity, a number of arc-shaped driving grooves are evenly distributed on the driving disk, a track disk is fixedly installed on the top of the lower mold, the track disk is provided with sliding grooves with the same number as the driving grooves, a sliding block is slidably arranged in the sliding groove, a driving rod is fixedly installed on the sliding block, and the end of the driving rod passes through the track disk and is located in the driving groove; each sliding groove is threadedly connected to a connecting rod arranged parallel to the sliding groove, and a fixing ring is fixedly connected to the end of the connecting rod.

4. The visual field detection device applicable to helmets of different specifications according to claim 3 is characterized in that: The supporting part includes a rotating shaft rotatably installed in the middle mold and a square hole arranged in the middle mold. A driving thread is arranged on the rotating shaft. The driving thread is located in the square hole and is connected to a driving nut. Two fixing rods are symmetrically installed on the driving nut. The ends of the fixing rods pass through the top of the middle mold and are fixedly connected to the supporting points.

5. The visual field detection device applicable to helmets of different specifications according to claim 4 is characterized in that: The top of the track plate and the top of the middle mold are both provided with mounting holes, rolling bearings are installed in the mounting holes, the rotating shaft is installed on the two rolling bearings, a through hole is provided at the center of the driving shaft, and the end of the rotating shaft extends through the through hole to the outside of the lower driving shaft.

6. The visual field detection device applicable to helmets of different specifications according to claim 2 is characterized in that: An upper detection point and a lower detection point are provided on the lower die, the upper detection point is located directly below the top surface of the lower die, the lower detection point is provided directly below the upper detection point, and the lower detection point is movably provided on the lower die; a driving hole is vertically provided in the lower die and a moving screw rod is rotatably installed, a nut adapted to the moving screw rod is provided in the driving hole, the nut is located in the driving hole, a long hole connected to the driving hole is provided on the lower die, and the lower detection point passes through the long hole and is fixedly connected to the nut.

7. The visual field detection device applicable to helmets of different specifications according to claim 6 is characterized in that: An upper transmitter is installed on the upper detection point, and a lower transmitter is installed on the lower detection point; a left transmitter and a right transmitter are installed in the vertical direction between the upper detection point and the lower detection point.

8. The visual field detection device applicable to helmets of different specifications according to claim 7 is characterized in that: A bracket is provided at the bottom of the detection cover, and the bracket is fixedly installed on the support plate. A fixed point is provided on the bracket, and a positioning point matching the fixed point is installed on the bottom of the head mold; the positioning point and the connecting line of the upper emitter and the lower emitter coincide with the extension line in the vertical direction; a horizontal receiver is installed on the detection cover, and the horizontal receiver and the upper detection point on the head mold are on the same horizontal plane, and a horizontal emitter adapted to the horizontal receiver is installed on the upper detection point.

9. The visual field detection device applicable to helmets of different specifications according to claim 8, characterized in that: An upper receiver adapted to the upper transmitter is arranged in the detection cover; a movable groove is arranged in the vertical direction in the detection cover, a sliding plate is slidably installed in the movable groove, a driving screw adapted to the upper transmitter is rotatably installed in the movable groove, a lower receiver adapted to the upper transmitter is installed on the sliding plate, and when the driving screw rotates, the sliding plate is driven to move up and down in the movable groove.

10. The visual field detection device applicable to helmets of different specifications according to claim 9, characterized in that: A left receiver adapted to the left transmitter and a right receiver adapted to the right transmitter are installed in the detection cover. The left receiver and the left transmitter are on the same horizontal plane and are used to detect the left viewing angle of the helmet; the right receiver and the right transmitter are on the same horizontal plane and are used to detect the right viewing angle of the helmet.

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