Safety helmet with positioning function and use method thereof

Abstract

The invention relates to the technical field of safety helmets, in particular to a safety helmet with a positioning function and a using method thereof.The safety helmet comprises a safety helmet body, a center console and a positioning base station, a positioning mechanism is arranged at the top of the safety helmet body, and a connecting mechanism is arranged on the outer wall of the safety helmet body and located below the positioning mechanism; positioning software is installed in the center console, and the positioning software comprises an error determination unit, a positioning unit and a track synthesis unit. Therefore, a positioning chip and an RFID card reader in the positioning mechanism are utilized to enable a positioning base station to determine the real-time position of a person wearing the safety helmet according to a transmission signal of the positioning chip through a transmission structure, and the problem that an existing safety helmet does not have a positioning function and cannot monitor and manage the position of a field person in real time is solved.

Description

Technical Field

[0001] The invention relates to the technical field of safety helmets, in particular to a safety helmet with a positioning function and a use method thereof. Background Art

[0002] A safety helmet is a device used to protect the heads of on-site personnel during construction. For example, the safety helmet provided by application number 202420359301.2 includes a helmet shell, which includes a plurality of corrugations; the corrugations extend from the top of the helmet shell to the edge of the helmet shell with a preset curvature; the plurality of corrugations are distributed along the circumference of the helmet shell, and are enclosed to form a cavity for accommodating the head. First of all, the presence of the corrugations increases the equivalent thickness of the helmet shell of the safety helmet provided by the present application from a structural level compared to the helmet shell of a traditional top-rib type safety helmet, thereby enhancing the strength of the helmet shell. The smooth transition connection between the brim and the helmet shell of the present application enhances the overall strength of the safety helmet. The present application also increases the length of the brim at the back of the head, thereby increasing the sun protection and protection area of ​​the back of the head and neck; in addition, the longitudinal angle of the rear brim is relatively small, which is more conducive to the protection of the wearer's neck and the separation of rain or particulate matter.

[0003] However, the existing safety helmets still have some shortcomings, specifically: the existing safety helmets do not have a positioning function, cannot monitor and manage the positions of on-site personnel, and have a low level of intelligence.

[0004] Therefore, a safety helmet with a positioning function and a method of using the same are needed to solve the problems raised in the above background technology. Summary of the invention

[0005] The object of the present invention is to provide a safety helmet with a positioning function and a method of using the same, so as to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A safety helmet with a positioning function comprises a safety helmet body, a central console and a positioning base station, wherein a positioning mechanism is arranged on the top of the safety helmet body, a connecting mechanism is arranged on the outer wall of the safety helmet body and below the positioning mechanism, and positioning software is installed in the central console, wherein the positioning software comprises an error determination unit, a positioning unit and a trajectory synthesis unit;

[0008] The positioning mechanism includes a positioning box slidably connected to the outer wall of the helmet body, a positioning chip is installed inside the positioning box, a transmission antenna is fixedly connected inside the positioning box and above the positioning chip, a battery is installed inside the positioning box and below the positioning chip, an RFID card reader is arranged inside the positioning box and on the left side of the positioning chip, a card insertion rack is slidably connected inside the positioning box and above the RFID card reader, a guide rod is fixedly connected to the top of the card insertion rack, a return spring is fixedly connected to the top of the card insertion rack and near the guide rod, a push-pull electromagnet is fixedly connected inside the positioning box and directly above the card insertion rack, a micro switch is installed inside the positioning box and on the right side of the battery, an extrusion rod is slidably connected inside the positioning box and at the corresponding position of the micro switch, a push spring is installed on the outer wall of the extrusion rod, a protective plate is fixedly connected to the top of the positioning box, and connecting blocks are fixedly connected to the front and back sides of the positioning box.

[0009] As a preferred solution of the present invention, the connecting mechanism includes a connecting frame fixedly connected to the top of the safety helmet body, a push rod is installed on the inner wall of the connecting frame, a guide groove is opened inside the connecting frame and near the connecting block, a positioning pin is slidably connected inside the guide groove and above and below the connecting block, an inner spring is fixedly connected to the outer wall of the positioning pin, a piston plate is slidably connected inside the guide groove and below the positioning box, a micro electric push rod is fixedly connected to the outer wall of the piston plate, a lithium battery is installed inside the connecting frame and above the guide groove, and an electronic button is installed on the front of the connecting frame.

[0010] As a preferred solution of the present invention, the positioning base stations are provided in multiple groups, and the central console is connected to the positioning base stations via a wireless data network.

[0011] As a preferred solution of the present invention, the specific analysis steps of the error determination unit are as follows: the positioning base station inputs its own coordinate position into the central console, the error determination unit substitutes the input coordinate data into the Euclidean distance formula, calculates the distance between the positioning base stations, uses the wired network to synchronize the base stations, and calculates the time difference between the messages transmitted and received based on the timestamps of the sent and received information, and substitutes the time difference data and the distance data between the positioning base stations into the error formula The delay error of the positioning base station is calculated, and the error determination unit inputs the calculated delay error of the positioning base station into the positioning base station, and the positioning base station corrects its own time stamp according to the input extension error.

[0012] As a preferred solution of the present invention, the specific analysis steps of the positioning unit are as follows: the positioning mechanism initiates a distance measurement to each positioning base station in turn, the positioning base station calculates the distance value of each distance measurement according to the input ranging signal, and inputs the calculated data and RFID identification data into the central console, and the positioning unit in the positioning software lists the positioning model according to the distance value. Where (x, y, z) are the coordinates of the positioning mechanism, (x i ,y i 、z i ) are the coordinates of each positioning base station, d i is the distance between the positioning mechanism and the i-th positioning base station obtained by UWB ranging, and then the UWB ranging intersection positioning model is converted into a nonlinear programming function Where f(x) is the objective function, R i represents the distance between the calculated positioning mechanism and each positioning base station, h i (X k) is the equality constraint, representing the ranging equations, g j (Xk) is an inequality constraint, indicating that the vertical coordinate of the label node is greater than 0. The SLSQP algorithm is used to solve this nonlinear programming function to obtain the initial coordinate position, and then the base station grouping and switching strategy are regrouped and switched to a new positioning base station for ranging. The initial coordinates solved by the SLSQP algorithm are used as the initial value of the iteration, and the positioning model is solved using the Newton iteration method. The positioning coordinates are recalculated, and the unscented Kalman filter algorithm is used to process the recalculated positioning coordinates to obtain the final positioning coordinates.

[0013] As a preferred solution of the present invention, the specific analysis steps of the trajectory synthesis unit are: the positioning unit inputs the final positioning coordinates and the RFID identification data into the trajectory synthesis unit, the trajectory synthesis unit finds the final positioning coordinates with the same RFID identification data according to the RFID identification data, and displays the final positioning coordinates with the same RFID identification data on the center console according to the time sequence.

[0014] As a preferred solution of the present invention, the connecting frame and the piston plate are both made of ABS plastic, the connecting frame is designed as a concave structure, the positioning pins and the inner springs are both provided with multiple groups, the connection method between the inner spring and the guide groove (503) and the micro electric push rod and the connecting frame are all fixed connections, the piston plate and the micro electric push rod are both provided with two groups, the connection method between the micro electric push rod, the lithium battery and the electronic button is all electrical connection, the positioning pin passes through and extends into the connecting block, and the connection method between the positioning pin, the connecting frame and the connecting block is all sliding connection.

[0015] As a preferred solution of the present invention, the positioning box, the card holder, the protection plate and the extrusion rod are all made of ABS plastic, the protection plate is designed in an arc structure, the positioning chip is a UWB chip, and the model is DW1000, the card holder is designed in an I-shaped structure, the guide rods and the reset springs are each provided with two groups, the reset spring and the push spring are all connected to the positioning box in a fixed manner, the transmission antenna is connected to the positioning base station via a wireless data network, the connecting block is designed in an I-shaped structure, and the positioning chip, the transmission antenna, the battery, the RFID card reader, the push-pull electromagnet and the micro switch are all connected electrically.

[0016] As a preferred solution of the present invention, in the error formula, t ab S is the time difference between the two positioning base stations a and b in transmitting messages. ab is the distance difference between the two positioning base stations a and b, σ a , σ b They are the delay errors of two groups of positioning base stations, a and b.

[0017] As a preferred solution of the present invention, the following steps are included:

[0018] S1, start the positioning base station, the positioning base station inputs its own coordinate position into the central console, the error determination unit in the positioning software substitutes the input coordinate data into the Euclidean distance formula, calculates the distance between the positioning base stations, uses the wired network to synchronize the base stations, and calculates the time difference between the messages transmitted and received based on the timestamps of the sent and received information, and substitutes the time difference data and the distance data between the positioning base stations into the error formula In which t ab The delay error of the positioning base station is calculated as the time difference between the two groups of positioning base stations a and b for transmitting messages. The error determination unit inputs the calculated positioning base station delay error into the positioning base station, and the positioning base station corrects its own timestamp according to the input extension error;

[0019] S2, the helmet body and the positioning box are distributed to the construction workers entering the construction site. The construction workers insert the positioning box into the connection frame on the top of the helmet body. After the positioning box is completely inserted into the connection frame, the push rod will be inserted into the positioning box. The push rod entering the positioning box will push the extrusion rod to move inward. The extrusion rod moving inward will squeeze the micro switch. The moving contact at the end of the action reed inside the squeezed micro switch is quickly connected with the fixed contact. The micro switch activates the push-pull electromagnet, the RFID card reader and the positioning chip. The push-pull electromagnet will push the card insertion rack to move downward. The descending card insertion rack will be close to the RFID card reader. The construction worker inserts the identity card into the card insertion rack. The RFID card reader will read the information of the construction worker's identity card. The construction worker presses the electronic button. The electronic button activates the micro electric push rod to push the piston plate to move to both sides. The piston plate moving to both sides will send air into the guide groove. The air entering the guide groove will push the positioning pin close to the connection block. The positioning pin is inserted into the connection block. The positioning pin clamps the connection block, thereby fixing the positioning box in the connection frame on the top of the helmet body.

[0020] S3, the construction worker wears the helmet body 1 on his head and enters the construction site. The positioning chip sends a distance measurement signal to each positioning base station in turn through the transmission antenna. At the same time, the RFID card reader sends RFID identification data to each positioning base station in turn through the transmission antenna. The positioning base station calculates the distance value of each distance measurement according to the input distance measurement signal, and inputs the calculated data and RFID identification data into the central console. The positioning unit in the positioning software lists the positioning model according to the distance value. Then convert the UWB ranging intersection positioning model into a nonlinear programming function The SLSQP algorithm is used to solve the nonlinear programming function to obtain the initial coordinate position, and the base station grouping and switching strategy are regrouped and switched to a new positioning base station for ranging. The initial coordinates solved by the SLSQP algorithm are used as the initial value of the iteration, and the positioning model is solved by the Newton iteration method. The positioning coordinates are recalculated, and the recalculated positioning coordinates are processed using the unscented Kalman filter algorithm to obtain the final positioning coordinates. The positioning unit inputs the final positioning coordinates and RFID identification data into the trajectory synthesis unit. The trajectory synthesis unit finds the final positioning coordinates with the same RFID identification data according to the RFID identification data, and displays the final positioning coordinates with the same RFID identification data on the center console according to the time sequence, thereby obtaining the moving trajectory of the positioning mechanism.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. In the present invention, a positioning mechanism is set in the safety helmet, so that the positioning chip and RFID card reader in the positioning mechanism are used through the transmission structure to enable the positioning base station to determine the real-time position of the person wearing the safety helmet according to the transmission signal of the positioning chip. Therefore, when the safety helmet is in use, the central control console can monitor and manage the real-time position and movement trajectory of the person wearing the safety helmet. The degree of intelligence is high, which solves the problem that the existing safety helmet has no positioning function and cannot monitor and manage the position of the on-site personnel in real time.

[0023] 2. In the present invention, a connecting mechanism is provided in the safety helmet, so that the positioning pin and the piston rod in the connecting mechanism can be used to conveniently clamp the connecting block on the outer wall of the positioning box through the pushing structure, so that the positioning box can be easily and quickly installed and removed from the safety helmet body during use, and the operation is more convenient, which solves the problem that the positioning device of the existing safety helmet body is fixed in the safety helmet, which is inconvenient to install and remove. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the three-dimensional structure of the helmet body of the present invention;

[0025] Figure 2 It is a front cross-sectional view of the connection frame of the present invention;

[0026] Figure 3 For the present invention Figure 2 Enlarged view of point A in the middle;

[0027] Figure 4 It is a side sectional view of the connection frame of the present invention;

[0028] Figure 5 It is a schematic diagram of the hardware structure of the system of the present invention;

[0029] Figure 6 It is a schematic diagram of the system block structure of the present invention.

[0030] In the figure: 1. helmet body; 2. center console; 3. positioning base station; 4. positioning mechanism; 5. connecting mechanism; 6. positioning software; 7. error determination unit; 8. positioning unit; 9. trajectory synthesis unit; 401. positioning box; 402. positioning chip; 403. transmission antenna; 404. battery; 405. RFID card reader; 406. card holder; 407. guide rod; 408. reset spring; 409. push-pull electromagnet; 410. micro switch; 411. extrusion rod; 412. push spring; 413. protection plate; 414. connecting block; 501. connecting frame; 502. push rod; 503. guide groove; 504. positioning pin; 505. inner spring; 506. piston plate; 507. micro electric push rod; 508. lithium battery; 509. electronic button. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0032] For examples, see Figure 1-6 , the present invention provides a technical solution:

[0033] A safety helmet with a positioning function comprises a safety helmet body 1, a central console 2 and a positioning base station 3, a positioning mechanism 4 is arranged on the top of the safety helmet body 1, a connecting mechanism 5 is arranged on the outer wall of the safety helmet body 1 and below the positioning mechanism 4, a positioning software 6 is installed in the central console 2, and the positioning software 6 comprises an error determination unit 7, a positioning unit 8 and a trajectory synthesis unit 9;

[0034] There are multiple groups of positioning base stations 3, and the central console 2 is connected to the positioning base stations 3 via a wireless data network;

[0035] Furthermore, the positioning mechanism 4 includes a positioning box 401 slidably connected to the outer wall of the helmet body 1, a positioning chip 402 is installed inside the positioning box 401, a transmission antenna 403 is fixedly connected inside the positioning box 401 and above the positioning chip 402, a battery 404 is installed inside the positioning box 401 and below the positioning chip 402, an RFID card reader 405 is arranged inside the positioning box 401 and on the left side of the positioning chip 402, a card holder 406 is slidably connected inside the positioning box 401 and above the RFID card reader 405, and a guide rod is fixedly connected to the top of the card holder 406 407, a return spring 408 is fixedly connected to the top of the card holder 406 and near the guide rod 407, a push-pull electromagnet 409 is fixedly connected to the inside of the positioning box 401 and just above the card holder 406, a micro switch 410 is installed inside the positioning box 401 and on the right side of the battery 404, an extrusion rod 411 is slidably connected to the inside of the positioning box 401 and at the corresponding position of the micro switch 410, a push spring 412 is installed on the outer wall of the extrusion rod 411, a protection plate 413 is fixedly connected to the top of the positioning box 401, and a connecting block 414 is fixedly connected to the front and back of the positioning box 401;

[0036] The positioning box 401, the card holder 406, the protection plate 413 and the extrusion rod 411 are all made of ABS plastic, the protection plate 413 is an arc-shaped structure, the positioning chip 402 is a UWB chip with the model number of DW1000, the card holder 406 is an I-shaped structure, the guide rod 407 and the reset spring 408 are both provided with two groups, the reset spring 408, the push spring 412 and the positioning box 401 are all connected in a fixed manner, the transmission antenna 403 is connected to the positioning base station 3 through a wireless data network, the connection block 414 is an I-shaped structure, and the positioning chip 402, the transmission antenna 403, the battery 404, the RFID reader 405, the push-pull electromagnet 409 and the micro switch 410 are all connected in an electrical manner.

[0037] Further, the connecting mechanism 5 includes a connecting frame 501 fixedly connected to the top of the helmet body 1, a push rod 502 is installed on the inner wall of the connecting frame 501, a guide groove 503 is opened inside the connecting frame 501 and near the connecting block 414, a positioning pin 504 is slidably connected inside the guide groove 503 and above and below the connecting block 414, an inner spring 505 is fixedly connected to the outer wall of the positioning pin 504, a piston plate 506 is slidably connected inside the guide groove 503 and below the positioning box 401, a micro electric push rod 507 is fixedly connected to the outer wall of the piston plate 506, a lithium battery 508 is installed inside the connecting frame 501 and above the guide groove 503, and an electronic button 509 is installed on the front of the connecting frame 501;

[0038] The connecting frame 501 and the piston plate 506 are both made of ABS plastic, the connecting frame 501 is a concave-shaped structure design, the positioning pins 504 and the inner springs 505 are both provided with multiple groups, the inner springs 505 and the guide grooves 503) and the micro electric push rod 507 are connected to the connecting frame 501 in a fixed manner, the piston plate 506 and the micro electric push rod 507 are both provided with two groups, the micro electric push rod 507, the lithium battery 508 and the electronic button 509 are all connected electrically, the positioning pin 504 passes through and extends into the connecting block 414, and the positioning pin 504, the connecting frame 501 and the connecting block 414 are all connected in a sliding manner.

[0039] Furthermore, the specific analysis steps of the error determination unit 7 are as follows: the positioning base station 3 inputs its own coordinate position into the central console 2, the error determination unit 7 substitutes the input coordinate data into the Euclidean distance formula, calculates the distance between the positioning base stations 3, uses the wired network to synchronize the base stations, and calculates the time difference between the messages transmitted and received based on the timestamps of the sent and received information, and substitutes the time difference data and the distance data between the positioning base stations 3 into the error formula The delay error of the positioning base station 3 is calculated, and the error determination unit 7 inputs the calculated delay error of the positioning base station 3 into the positioning base station 3. The positioning base station 3 corrects its own time stamp according to the input extension error.

[0040] Furthermore, the specific analysis steps of the positioning unit 8 are as follows: the positioning mechanism 4 initiates a distance measurement to each positioning base station 3 in turn, the positioning base station 3 calculates the distance value of each distance measurement according to the input ranging signal, and inputs the calculated data and RFID identification data into the central console 2, and the positioning unit 8 in the positioning software 6 lists the positioning model according to the distance value. Where x, y, and z are the coordinates of the positioning mechanism 4. i ,y i 、z i is the coordinate of each positioning base station, di is the distance between the positioning mechanism 4 and the i-th positioning base station 3 obtained by UWB ranging, and then the UWB ranging intersection positioning model is converted into a nonlinear programming function Where f(x) is the objective function, R i represents the calculated distance between the positioning mechanism 4 and each positioning base station 3, hi(X k) is an equality constraint, which represents the ranging equation group. gj(Xk) is an inequality constraint, which means that the ordinate of the tag node is greater than 0. The SLSQP algorithm is used to solve this nonlinear programming function to obtain the initial coordinate position, and the base station grouping and switching strategy are regrouped and switched to the new positioning base station 3 for ranging. The initial coordinates solved by the SLSQP algorithm are used as the initial value of the iteration. The positioning model is solved using the Newton iteration method, and the positioning coordinates are recalculated. The unscented Kalman filter algorithm is used to process the recalculated positioning coordinates to obtain the final positioning coordinates.

[0041] Furthermore, the specific analysis steps of the trajectory synthesis unit 9 are: the positioning unit 8 inputs the final positioning coordinates and the RFID identification data into the trajectory synthesis unit 9, the trajectory synthesis unit 9 finds the final positioning coordinates with the same RFID identification data according to the RFID identification data, and displays the final positioning coordinates with the same RFID identification data on the central console 2 according to the time sequence.

[0042] Furthermore, in the error formula, t ab S is the time difference between the two groups of positioning base stations 3 a and b in transmitting messages, ab is the distance difference between the two groups of positioning base stations 3, a and b, σ a , σ b They are the delay errors of two groups of positioning base stations 3, a and b.

[0043] The working process of the present invention is as follows: when a safety helmet with a positioning function designed by the present invention is used, the positioning base station 3 is started, the positioning base station 3 inputs its own coordinate position into the central console 2, the error determination unit 7 in the positioning software 6 substitutes the input coordinate data into the Euclidean distance formula, calculates the distance between the positioning base stations 3, uses the wired network to synchronize the base stations, and calculates the time difference of transmitting messages between each other according to the timestamps of sending and receiving information, substitutes the time difference data and the distance data between the positioning base stations 3 into the error formula In which t ab S is the time difference between the two groups of positioning base stations 3 a and b in transmitting messages, ab is the distance difference between the two groups of positioning base stations 3, a and b, σ a , σ b The delay errors of the two groups of positioning base stations 3, a and b, are calculated, and the delay error of the positioning base station 3 is input into the positioning base station 3 by the error determination unit 7. The positioning base station 3 corrects its own timestamp according to the input delay error;

[0044] The helmet body 1 and the positioning box 401 are distributed to the construction workers entering the construction site. The construction workers insert the positioning box 401 into the connection frame 501 on the top of the helmet body 1. After the positioning box 401 is completely inserted into the connection frame 501, the push rod 502 is inserted into the positioning box 401. The push rod 502 entering the positioning box 401 pushes the squeezing rod 411 to move inward. The squeezing rod 411 moving inward squeezes the micro switch 410. The moving contact at the end of the action reed inside the squeezed micro switch 410 is quickly connected with the fixed contact. The micro switch 410 starts the push-pull electromagnet 409, the RFID card reader 405 and the positioning chip 402. The push-pull electromagnet 409 pushes the card holder 40 6 moves downward, the descending card holder 406 will be close to the RFID card reader 405, the construction worker inserts the ID card into the card holder 406, the RFID card reader 405 will read the information of the construction worker's ID card, the construction worker presses the electronic button 509, the electronic button 509 activates the micro electric push rod 507 to push the piston plate 506 to move to both sides, the piston plate 506 moving to both sides will send air into the guide groove 503, the air entering the guide groove 503 will push the positioning pin 504 close to the connecting block 414, the positioning pin 504 is inserted into the connecting block 414, the positioning pin 504 is stuck in the connecting block 414, so that the positioning box 401 is fixedly installed in the connecting frame 501 on the top of the helmet body 1;

[0045] The construction worker wears the helmet body 1 on his head and enters the construction site. The positioning chip 402 sends a distance measurement signal to each positioning base station 3 in turn through the transmission antenna 403. At the same time, the RFID card reader 405 sends RFID identification data to each positioning base station 3 in turn through the transmission antenna 403. The positioning base station 3 calculates the distance value of each distance measurement according to the input distance measurement signal, and inputs the calculated data and RFID identification data into the central console 2. The positioning unit 8 in the positioning software 6 lists the positioning model according to the distance value. Where x, y, and z are the coordinates of the positioning mechanism 4 that inputs the ranging signal. i ,y i 、z i is the coordinate of each positioning base station 3, d i is the distance between the positioning mechanism 4 and the i-th positioning base station 3 obtained by UWB ranging, and then the UWB ranging intersection positioning model is converted into a nonlinear programming function Where f(x) is the objective function, R i represents the calculated distance between the positioning mechanism 4 and each positioning base station 3, hi(X k) is an equality constraint, which represents the ranging equation group. gj(Xk) is an inequality constraint, which means that the vertical coordinate of the tag node is greater than 0. The SLSQP algorithm is used to solve this nonlinear programming function to obtain the initial coordinate position, and the base station grouping and switching strategy are regrouped and switched to the new positioning base station 3 for ranging. The initial coordinates solved by the SLSQP algorithm are used as the initial value of the iteration. The positioning model is solved using the Newton iteration method, and the positioning coordinates are recalculated. The unscented Kalman filter algorithm is used to process the recalculated positioning coordinates to obtain the final positioning coordinates.

[0046] The positioning unit 8 inputs the final positioning coordinates and the RFID identification data into the track synthesis unit 9. The track synthesis unit 9 finds the final positioning coordinates with the same RFID identification data according to the RFID identification data, and displays the final positioning coordinates with the same RFID identification data on the central console 2 according to the time sequence;

[0047] When the construction worker leaves the construction site, he takes off the helmet body 1 he is wearing, draws out the identity card in the card holder 406, presses the electronic button 509 again, and the electronic button 509 starts the micro electric push rod 507 again. The micro electric push rod 507 drives the piston plate 506 to move in the opposite direction. The piston plate 506 moving in the opposite direction draws out the air in the guide groove 503, and the inner spring 505 pulls the positioning pin 504 to move in the opposite direction. The positioning pin 504 moving in the opposite direction pushes out the connecting block 414, and the positioning pin 504 no longer blocks the connecting block 414. The positioning box 401 is pulled to remove the positioning box 401 from the connecting frame 501. , the pushing rod 502 pushes out the positioning box 401, the pushing rod 502 no longer resists the squeezing rod 411, the pushing spring 412 pushes the squeezing rod 411 to move in the opposite direction, the squeezing rod 411 no longer squeezes the micro switch 410, and the moving contact at the end of the action reed inside the micro switch 410 that is no longer squeezed is quickly disconnected from the fixed contact, the micro switch 410 turns off the push-pull electromagnet 409, the RFID card reader 405 and the positioning chip 402, the push-pull electromagnet 409 no longer pushes the card rack 406, the reset spring 408 pulls the card rack 406 to move upward, and the card rack 406 is separated from the RFID card reader 405.

[0048] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A safety helmet with a positioning function, comprising a safety helmet body (1), a central control console (2) and a positioning base station (3), characterized in that: A positioning mechanism (4) is provided on the top of the helmet body (1), a connecting mechanism (5) is provided on the outer wall of the helmet body (1) and below the positioning mechanism (4), and positioning software (6) is installed in the central console (2), and the positioning software (6) includes an error determination unit (7), a positioning unit (8) and a trajectory synthesis unit (9); The positioning mechanism (4) comprises a positioning box (401) slidably connected to the outer wall of the helmet body (1); a positioning chip (402) is installed inside the positioning box (401); a transmission antenna (403) is fixedly connected inside the positioning box (401) and above the positioning chip (402); a storage battery (404) is installed inside the positioning box (401) and below the positioning chip (402); an RFID card reader (405) is arranged inside the positioning box (401) and on the left side of the positioning chip (402); a card insertion rack (406) is slidably connected inside the positioning box (401) and above the RFID card reader (405); a guide rod (407) is fixedly connected to the top of the card insertion rack (406). ), a reset spring (408) is fixedly connected to the top of the card insertion rack (406) and at a position close to the guide rod (407), a push-pull electromagnet (409) is fixedly connected inside the positioning box (401) and directly above the card insertion rack (406), a micro switch (410) is installed inside the positioning box (401) and on the right side of the battery (404), an extrusion rod (411) is slidably connected inside the positioning box (401) and at a position corresponding to the micro switch (410), a push spring (412) is installed on the outer wall of the extrusion rod (411), a protection plate (413) is fixedly connected to the top of the positioning box (401), and a connection block (414) is fixedly connected to the front and back of the positioning box (401).

2. A safety helmet with positioning function according to claim 1, characterized in that: The connecting mechanism (5) comprises a connecting frame (501) fixedly connected to the top of the helmet body (1); a push rod (502) is installed on the inner wall of the connecting frame (501); a guide groove (503) is provided inside the connecting frame (501) and near the connecting block (414); a positioning pin (504) is slidably connected inside the guide groove (503) and above and below the connecting block (414); an inner spring (505) is fixedly connected to the outer wall of the positioning pin (504); a piston plate (506) is slidably connected inside the guide groove (503) and below the positioning box (401); a micro electric push rod (507) is fixedly connected to the outer wall of the piston plate (506); a lithium battery (508) is installed inside the connecting frame (501) and above the guide groove (503); and an electronic button (509) is installed on the front of the connecting frame (501).

3. The safety helmet with positioning function according to claim 1, characterized in that: The positioning base stations (3) are provided in multiple groups, and the central control station (2) is connected to the positioning base stations (3) via a wireless data network.

4. The safety helmet with positioning function according to claim 1, characterized in that: The specific analysis steps of the error determination unit (7) are as follows: the positioning base station (3) inputs its own coordinate position into the central console (2), the error determination unit (7) substitutes the input coordinate data into the Euclidean distance formula, calculates the distance between the positioning base stations (3), uses the wired network to synchronize the base stations, and calculates the time difference between the messages transmitted and received based on the timestamps of the sent and received messages, and substitutes the time difference data and the distance data between the positioning base stations (3) into the error formula The delay error of the positioning base station (3) is calculated, and the error determination unit (7) inputs the calculated delay error of the positioning base station (3) into the positioning base station (3), and the positioning base station (3) corrects its own time stamp according to the input extension error.

5. The safety helmet with positioning function according to claim 1, characterized in that: The specific analysis steps of the positioning unit (8) are as follows: the positioning mechanism (4) initiates a distance measurement to each positioning base station (3) in turn, the positioning base station (3) calculates the distance value of each distance measurement according to the input distance measurement signal, and inputs the calculated data and RFID identification data into the central control console (2), and the positioning unit (8) in the positioning software (6) lists the positioning model according to the distance value Where (x, y, z) are the coordinates of the positioning mechanism (4), (x i ,y i 、z i ) are the coordinates of each positioning base station, d i is the distance between the positioning mechanism (4) and the i-th positioning base station (3) obtained by UWB ranging, and then the UWB ranging intersection positioning model is converted into a nonlinear programming function Where f(x) is the objective function, R i represents the calculated distance between the positioning mechanism (4) and each positioning base station (3), h i (X k) is the equality constraint, representing the ranging equations, g j (X k) is an inequality constraint, indicating that the vertical coordinate of the tag node is greater than 0. The SLSQP algorithm is used to solve this nonlinear programming function to obtain the initial coordinate position, and the base station grouping and switching strategy are regrouped and switched to a new positioning base station (3) for ranging. The initial coordinates solved by the SLSQP algorithm are used as the initial value of the iteration, and the positioning model is solved using the Newton iteration method. The positioning coordinates are recalculated, and the unscented Kalman filter algorithm is used to process the recalculated positioning coordinates to obtain the final positioning coordinates.

6. The safety helmet with positioning function according to claim 1, characterized in that: The specific analysis steps of the trajectory synthesis unit (9) are as follows: the positioning unit (8) inputs the final positioning coordinates and the RFID identification data into the trajectory synthesis unit (9), the trajectory synthesis unit (9) searches for the final positioning coordinates having the same RFID identification data according to the RFID identification data, and displays the final positioning coordinates having the same RFID identification data on the central console (2) according to the time sequence.

7. The safety helmet with positioning function according to claim 2, characterized in that: The connecting frame (501) and the piston plate (506) are both made of ABS plastic. The connecting frame (501) is designed as a concave-shaped structure. The positioning pins (504) and the inner springs (505) are both provided with multiple groups. The inner springs (505) and the guide grooves (503) and the micro electric push rods (507) and the connecting frame (501) are both connected in a fixed manner. The piston plate (506) and the micro electric push rods (507) are both provided with two groups. The micro electric push rods (507), the lithium battery (508) and the electronic button (509) are both connected in an electrical manner. The positioning pins (504) penetrate and extend into the connecting block (414). The positioning pins (504), the connecting frame (501) and the connecting block (414) are both connected in a sliding manner.

8. The safety helmet with positioning function according to claim 1, characterized in that: The positioning box (401), the card insertion rack (406), the protection plate (413) and the extrusion rod (411) are all made of ABS plastic. The protection plate (413) is designed in an arc structure. The positioning chip (402) is a UWB chip with a model of DW1000. The card insertion rack (406) is designed in an I-shaped structure. The guide rod (407) and the return spring (408) are both provided with two groups. The return spring (408) and the push spring (412) are connected to the positioning box (401) in a fixed connection. The transmission antenna (403) is connected to the positioning base station (3) through a wireless data network. The connection block (414) is designed in an I-shaped structure. The positioning chip (402), the transmission antenna (403), the storage battery (404), the RFID card reader (405), the push-pull electromagnet (409) and the micro switch (410) are all connected in an electrical connection.

9. The safety helmet with positioning function according to claim 4, characterized in that: In the error formula, t ab S is the time difference between the two positioning base stations (3) of a and b for transmitting messages, ab is the distance difference between the two positioning base stations (3) a and b, σ a , σ b They are the delay errors of two groups of positioning base stations (3), a and b respectively.

10. A method for using a safety helmet with a positioning function according to claims 1-9, characterized in that: The following steps are involved: S1, start the positioning base station (3), the positioning base station (3) inputs its own coordinate position into the central console (2), the error determination unit (7) in the positioning software (6) substitutes the input coordinate data into the Euclidean distance formula, calculates the distance between the positioning base stations (3), uses the wired network to synchronize the base stations, and calculates the time difference between the messages transmitted and received based on the timestamps of the sent and received messages, and substitutes the time difference data and the distance data between the positioning base stations (3) into the error formula The delay error of the positioning base station (3) is calculated, the error determination unit (7) inputs the calculated delay error of the positioning base station (3) into the positioning base station (3), and the positioning base station (3) corrects its own time stamp according to the input extension error; S2, the helmet body (1) and the positioning box (401) are distributed to the construction workers who enter the construction site. The construction workers insert the positioning box (401) into the connection frame (501) at the top of the helmet body (1). After the positioning box (401) is completely inserted into the connection frame (501), the push rod (502) is inserted into the positioning box (401). The push rod (502) entering the positioning box (401) pushes the squeezing rod (411) to move inward. The squeezing rod (411) moving inward squeezes the micro switch (410). The moving contact at the end of the action reed inside the squeezed micro switch (410) is quickly connected with the fixed contact. The micro switch (410) activates the push-pull electromagnet (409), the RFID card reader (405) and the positioning chip (402). The push-pull electromagnet (409) pushes the card holder ( 406) moves downward, the descending card insertion rack (406) will be close to the RFID card reader (405), the construction worker inserts the ID card into the card insertion rack (406), the RFID card reader (405) will read the information of the construction worker's ID card, the construction worker presses the electronic button (509), the electronic button (509) starts the micro electric push rod (507) to push the piston plate (506) to move to both sides, the piston plate (506) moving to both sides will send air into the guide groove (503), the air entering the guide groove (503) will push the positioning pin (504) close to the connecting block (414), the positioning pin (504) is inserted into the connecting block (414), the positioning pin (504) is stuck in the connecting block (414), so that the positioning box (401) is fixedly installed in the connecting frame (501) on the top of the safety helmet body (1); S3, the construction worker wears the helmet body 1 on his head and enters the construction site. The positioning chip (402) sends a distance measurement signal to each positioning base station (3) in turn through the transmission antenna (403). At the same time, the RFID card reader (405) sends RFID identification data to each positioning base station (3) in turn through the transmission antenna (403). The positioning base station (3) calculates the distance value of each distance measurement based on the input distance measurement signal, and inputs the calculated data and RFID identification data into the central control console (2). The positioning unit (8) in the positioning software (6) lists the positioning model according to the distance value. Then convert the UWB ranging intersection positioning model into a nonlinear programming function The nonlinear programming function is solved using an SLSQP algorithm to obtain an initial coordinate position, and the base station grouping and switching strategy are regrouped and switched to a new positioning base station (3) for ranging. The initial coordinates solved by the SLSQP algorithm are used as the initial value of the iteration, and the positioning model is solved using the Newton iteration method to recalculate the positioning coordinates. The recalculated positioning coordinates are processed using an unscented Kalman filter algorithm to obtain the final positioning coordinates. The positioning unit (8) inputs the final positioning coordinates and RFID identification data into a trajectory synthesis unit (9). The trajectory synthesis unit (9) finds the final positioning coordinates with the same RFID identification data according to the RFID identification data, and displays the final positioning coordinates with the same RFID identification data on the central console (2) according to the time sequence, thereby obtaining the moving trajectory of the positioning mechanism (4).

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