CN112918343A

CN112918343A - Child seat safety belt protection device and method thereof

Info

Publication number: CN112918343A
Application number: CN202110325962.4A
Authority: CN
Inventors: 方斌; 刘青; 王士贵
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-03-26
Filing date: 2021-03-26
Publication date: 2021-06-08

Abstract

The invention discloses a child seat safety belt protection device and a method thereof, belonging to the technical field of child seat airbag protection devices. A child seat safety belt protection device can use the child seat and the wearer can move freely, but a collision occurs. In the event of an accident, the webbing can be pulled back to reduce the gap between the webbing and the user, correct the user's sitting posture, and then the seat belt is emergency locked to restrain the user. The force rod releases the length of the webbing by twisting the metal rod to release the force, reducing the injury caused by the user's excessive force, and playing a good protective effect.

Description

Child seat safety belt protection device and method thereof

Technical Field

The invention relates to a child seat safety belt protection device, in particular to a child seat safety belt protection device and a method thereof.

Background

As an important travel vehicle, a consumer always pays attention to traffic safety, particularly, the riding safety of children is more and more paid attention, a child seat is accepted and used by consumers, at present, an adult passenger adopts a car safety belt to ensure the safety of the adult in a riding collision accident, but for an infant child seat, a fixed safety belt is used, and the infant cannot move freely.

At present, most of infant child seats are provided with fixed safety belts, the user is fixed by the woven belts, and even if no other hard objects in a secondary collision vehicle are left under the restraint of the fixed safety belts in a traffic accident, the head of the child is subjected to overlarge synthetic acceleration and the chest of the child is subjected to overlarge stress due to the protection and constraint effect of the safety belts, so that the child is seriously injured.

Disclosure of Invention

The purpose of the invention is as follows: a child seat belt protection device and a method thereof are provided to solve the above problems in the prior art.

The technical scheme is as follows: a child seat safety belt protection device comprises a safety belt which is arranged on a seat and is used for restraining a user, a pre-tightening recovery device arranged at one end of the safety belt, a retractor arranged on the side surface of the pre-tightening recovery device, a lock catch arranged on the safety belt, and a control system connected with the pre-tightening recovery device;

the pretension pull-back device comprises a gas generator arranged in the seat, when the pretension pull-back device is not used, the safety belt and the pretension pull-back device are fixed on the seat, and the control system is fixed on the support in the seat.

In a further embodiment, the safety belt is connected with a first sub-belt, the end part of the first sub-belt is connected with the retractor, a lock tongue is arranged at the other end of the first sub-belt, a lock catch is clamped with the lock tongue, the other end of the lock catch is connected with a second sub-belt, and one end of the second sub-belt is connected with the seat.

In a further embodiment, the retractor comprises a retractor body and a mandrel arranged on the retractor body, wherein the end part of the first branch belt is transversely sewn together along the length direction of the first branch belt to form an interlining space, the end part of the first branch belt penetrates through a plug rod, the first branch belt is fixed on the mandrel through the plug rod, the first branch belt is wound on the mandrel, the first branch belt penetrates through the mandrel, and a coil spring is arranged on one side of the mandrel;

when the first branch weaving belt is pulled out by a set length, the coil spring generates a rewinding force, the first branch weaving belt bears the rewinding force, and the first branch weaving belt is automatically recovered.

In a further embodiment, the pretensioned pullback device further comprises an angle sensitive mechanism;

the angle sensitive mechanism comprises a base arranged on the side face of the retractor body, an upper cover arranged on the base in a rotating fit mode, a metal ball arranged on the base, and a mechanical plate arranged on the retractor body in a rotating fit mode, wherein a groove is formed in the base.

In a further embodiment, the angle-sensitive mechanism further comprises a locking block arranged on the mandrel, the boss is assembled on the ratchet wheel on the locking block and arranged on the central shaft on the mandrel, the ratchet wheel rotates to drive the locking block to rotate to slide out of the mandrel, the teeth of the locking block are meshed with the frame gear of the retractor body to be locked, meanwhile, the other side of the locking block is fixed in the mandrel to drive the mandrel to be fixed, and after the mandrel is fixed, the first woven belt wound on the mandrel can not be pulled out, so that the woven belt can be used for fixing a user.

In a further embodiment, the metal ball is free to move in the groove;

the angle sensitive mechanism passes through the metal ball in the base, when the certain angle of slope, because the metal ball receives the action of gravity, locking mechanism is stirred in the metal ball removal, and first minute meshbelt can't be pulled out or produce the acceleration displacement when the coiler, and locking mechanism also can be stirred to the base because inertial action, and first minute meshbelt can't be pulled out.

In further embodiment, the safety belt in-band coiler has the limit power function, and after the safety belt locking, when reaching certain power value, through the torsion bar in the coiler, the torsion bar is the metal rod, twists reverse the metal rod and plays the effect of letting out force, reduces the injury that the too big result in of power value that the user received the restraint.

In a further embodiment, the control system comprises a pressure sensor disposed below the seat.

In a further embodiment, the pretensioned restraint device further comprises a gas generator disposed inside the seat belt, the gas generator being in signal communication with a control system.

In a further embodiment, a method of operating a child seat belt protection device includes the steps of:

step 1, a user buckles a lock tongue at the end part of a first sub-weaving belt and a lock catch on a second sub-weaving belt in a seat, and simultaneously connects chest buckles on a safety belt together;

step 2, continuously acquiring information by a control system, calculating the state of the coordinate seat through acceleration and angle change, giving a signal to the pre-tightening pull-back device, quickly releasing gas by a generator in the pre-tightening pull-back device, pushing the pre-tightening pull-back device, quickly recovering the safety belt, reducing the clearance between the woven belt and a user, and correcting the sitting posture of the user;

step 3, connecting the first branch weaving belt with a retractor, fixing the retractor on a seat through a bolt, and controlling the system to operate in real time;

step 4, the safety belt retractor has an emergency locking function, and an angle sensitive mechanism plays an emergency locking role and is normally matched to be capable of freely moving;

step 5, when the belt sensitive angle mechanism monitors acceleration, the winder receives signals, the first woven belt is tightened, the ratchet wheel is assembled on the mandrel through the central shaft, meanwhile, the boss on the locking block plays a role in fixing the movement track of the ratchet wheel, the ratchet wheel rotates by an angle to drive the locking block to rotate and slide out of the mandrel, teeth of the locking block are meshed with the frame gear to be locked, meanwhile, the other side of the locking block is fixed in the mandrel to drive the mandrel to be fixed, the woven belt wound on the mandrel can not be pulled out after the mandrel is fixed, and a user can be fixed;

step 6, when the acceleration of the first branch mesh belt reaches a certain threshold value, due to the inertia effect, the inertia block acts in a delayed mode to stir the locking mechanism, and the first branch mesh belt cannot be pulled out;

step 7, when the gravity effect takes place simultaneously, the metal ball is in the base, and when the certain angle of slope, because the metal ball receives the action of gravity, the locking mechanism is stirred in the metal ball removal, and first branch meshbelt can't be pulled out or produce speed displacement when the coiler, and the locking mechanism also can be stirred to the base because inertial action, and first branch meshbelt can't be pulled out to fix the user.

Has the advantages that: the invention discloses a child seat safety belt protection device, which can enable a child seat wearer to move freely, but can pull back a braid when a collision accident happens, so that the gap between the braid and the user is reduced, the sitting posture of the user is corrected, then the safety belt is locked and restrained emergently, when the stress of the user reaches a certain threshold value, a force limiting rod in the safety belt acts, the force limiting rod releases the length of the braid by twisting a metal rod to release the force, the injury caused by overlarge stress of the user is reduced, and a good protection effect is achieved.

Drawings

Fig. 1 is a schematic view showing the construction of a seat belt protection apparatus according to the present invention.

FIG. 2 is a schematic view of the mechanism of the angle sensitive mechanism of the present invention 1.

FIG. 3 is a schematic view of the mechanism of the angle sensitive mechanism of the present invention 2.

Fig. 4 is a schematic view showing a retractor according to the present invention.

The reference signs are: the safety belt comprises a safety belt 1, a first parting belt 101, a lock tongue 102, a pretensioning recovery device 2, an angle-sensitive mechanism 201, a base 202, an upper cover 203, a metal ball 204, a mechanical plate 205, a groove 206, a locking block 207, a central shaft 208, a ratchet 209, a locking mechanism 210, a torsion bar 211, a retractor 3, a mandrel 301, a stopper rod 302, a coil spring 304, a lock catch 4, a control system 5, a gas generator 6, a pressure sensor 7 and a second parting belt 8.

Detailed Description

Through the research and analysis of the applicant, most of the existing infant child seats are fixed safety belts, the user is fixed by the webbing, and even if the child is restrained by the fixed safety belts in a traffic accident and does not collide with other hard objects in the car for the second time, due to the protection and constraint effects of the safety belts, the child can be seriously injured due to overlarge head resultant acceleration and overlarge chest stress. In light of these problems, the applicant has proposed a child seat belt protection device, which is as follows.

As shown in the drawing, a child seat belt protection device is composed of a belt 1, a first webbing 101, a lock tongue 102, a pretensioning recovery device 2, an angle-sensitive mechanism 201, a base 202, an upper cover 203, a metal ball 204, a mechanical plate 205, a groove 206, a locking block 207, a central shaft 208, a ratchet 209, a locking mechanism 210, a torsion bar 211, a retractor 3, a spindle 301, a plug rod 302, a coil spring 304, a lock catch 4, a control system 5, a gas generator 6 and a pressure sensor 7.

As shown in fig. 1, a safety belt 1 is arranged on a seat, a pretension recovery device 2 is arranged at one end of the safety belt 1, a control system 5 is connected with the pretension recovery device 2, a retractor 3 is arranged at the side surface of the pretension recovery device, a gas generator 6 is arranged in the seat, the safety belt 1 and the pretension recovery device are fixed on the seat, and the control system 5 is fixed on a bracket in the seat.

Specifically, the safety belt 1 includes two parts, a first division belt 101 and a second division belt 8, the retractor 3 is connected with one end of the first division belt 101, the lock tongue 102 is connected with the other end of the first division belt 101, the second division belt 8 is arranged on the seat, the buckle 4 is connected with the second division belt, the lock tongue 102 is arranged at the other end of the first division belt 101, and when the user uses the safety belt, the lock tongue 102 is connected with the buckle 4 to fix the user.

As a preferable scheme, the retractor 3 comprises a retractor 3 body, a mandrel 301 is arranged on the retractor 3 body, the end portion of the first division tape 101 is transversely sewn together along the length direction of the first division tape 101 to form a space capable of being penetrated, a stopper rod 302 is arranged in the space capable of being penetrated, the first division tape 101 is fixed on the mandrel 301 through the stopper rod 302, the first division tape 101 is wound on the mandrel 301, the first division tape 101 penetrates through the mandrel 301, a coil spring 304 is arranged on one side of the mandrel 301, and after the first division tape 101 is pulled out by a set length, the coil spring 304 generates a rewinding force, the first division tape 101 bears a rewinding force, and the first division tape 101 is automatically recovered.

The control system 5 comprises an information acquisition module, an information processing module, a power supply and a connecting wire harness which are connected, wherein the information acquisition module and the information processing module are fixed below the seat through bolts, the power supply is positioned on one side of the seat and is convenient to charge or replace, and the information acquisition module, the information processing module, the power supply and the connecting wire harness are connected through the wire harness; meanwhile, the information processing module is connected with the pre-tightening pull-back device through a wire harness.

Specifically, the gas generator is arranged inside the seat, and a motor can be adopted to drive the pre-tightening pull-back device in a rotating mode.

As a preferred scheme, the retractor 3 in the safety belt 1 has an emergency locking function, and the belt-sensitive mechanism and the angle-sensitive mechanism 201 have an emergency locking function, and are normally matched to be freely movable, but when reaching a belt-sensitive or angle-sensitive threshold value, the retractor will be locked, so that the first sub-webbing 101 cannot be pulled out, and a function of fastening and restraining the displacement of a user is achieved. The belt is sensitive to act through the locking block 207, when the acceleration of the first branch mesh belt 101 is pulled out to reach a certain threshold value, due to the inertia effect, the locking block 207 acts in a delayed mode to poke the pre-tightening recovery mechanism, and the first branch mesh belt 101 cannot be pulled out. The angle is sensitive to pass through metal ball 204 in base 202, and when inclining certain angle, because metal ball 204 receives the action of gravity, metal ball 204 removes and stirs mechanical plate 205, and first minute belt 101 can't be pulled out or produce speed displacement when coiler 3, and mechanical plate 205 also can be stirred to metal ball 204 seat because inertial action, and mechanical plate 205 blocks dead ratchet 209 and makes first minute belt 101 can't be pulled out.

Specifically, locking piece 207 sets up the higher authority of dabber 301, the higher authority of locking piece 207 is equipped with the boss, and the boss assembly is assembled on ratchet 209 on locking piece 207, and center pin 208 sets up the higher authority of dabber 301, ratchet 209 turned angle drives locking piece 207 rotates roll-off dabber 301, and locking piece 207 tooth and the frame gear engagement locking of coiler 3 body, and locking piece 207 opposite side is fixed in dabber 301 simultaneously, and it is fixed to drive dabber 301, and it can't be pulled out to organize the first minute meshbelt 101 of winding on dabber 301 after dabber 301 is fixed to play the meshbelt and can fix the user's effect.

Specifically, for the free activity of metal ball 204, a groove 206 is formed in the upper surface of base 202, metal ball 204 is disposed in groove 206, metal ball 204 of angle sensitive mechanism 201 freely moves in groove 206, when the inclination occurs, because metal ball 204 receives the action of gravity, metal ball 204 moves to toggle locking mechanism 210, first minute belt 101 cannot be pulled out or when retractor 3 generates speed displacement, base 202 can also toggle locking mechanism 210 due to the inertia effect, and first minute belt 101 cannot be pulled out.

Specifically, too big injury that leads to of power that receives the restraint in order to reduce the user, safety belt 1 is connected at coiler 3 with coiler 3, behind the 1 locking of safety belt, when reaching certain power value, torsion bar 211 in coiler 3, torsion bar 211 are the metal rod, and the effect of leaking is played to the torsion bar, and then reduces the injury effect that the power value that the user received the restraint too big and leads to.

As a preferred scheme, the control system 5 comprises a power supply module, a circuit board, an acceleration sensor, an angle sensor, a pressure sensor 7 and a voice module, the impact state of a user is judged through operation identification, inflation is simultaneously performed, meanwhile, whether the pressure sensor 7 is in a use state or not is monitored, the function of reminding the user of not fastening the safety belt 1 can be achieved, the self-checking function is achieved, alarming is conducted on abnormal conditions, meanwhile, the control system 5 has a circuit and function continuous self-checking function, if the circuit is found to be abnormal, automatic alarming is achieved, in order to improve interaction, the control system 5 is further provided with a wireless communication module and an Internet of things terminal, information interaction, position location, network communication, Bluetooth control communication and infrared control communication can be achieved.

Specifically, the gas generator 6 in the pre-tightening pull-back device receives a signal, releases high-pressure gas to push the pre-tightening pull-back mechanism, drives the first division belt 101 to be rapidly recovered, reduces the gap between the safety belt 1 and a user, corrects the sitting posture of the user, and safely plays a pre-tightening role.

Specifically, pressure sensor 7 sets up in the below of seat, and gas generator 6 sets up safety belt 1's inside, and gas generator 6 links together with acceleration sensor simultaneously, constantly detects the seat state, and when detecting the angle change that the acceleration lasts to reach predetermined threshold value, gas generator 6 sends a signal for control system 5, and pretension pull-back device release gas generator 6 releases gas fast, and coiler 3 makes safety belt 1 retrieve fast.

Furthermore, the chest position of the child seat belt 1 is provided with a chest buckle, and the chest buckle is connected by the lock tongue 102 and the lock catch 4, so that the phenomenon that the child seat belt 1 slides on the shoulder is avoided.

Specifically, when speed changes, the metal ball 204 moves freely in the groove, the upper cover 203 connects the upper cover 203 with the base 202 through the pin shaft, the mechanical plate 205 is riveted on the retractor 3 body, the metal ball 204 moves freely in the groove 206, when acceleration occurs, the metal ball 204 moves in the groove 206, the metal ball 204 moves to jack up the upper cover 203, the upper cover 203 tilts up to be meshed with the ratchet 209 to lock the safety belt 1, or when the body of the safety belt 1 moves in acceleration, the metal ball 204 moves due to inertia and also jacks up the upper cover 203, the upper cover 203 tilts up to be meshed with the ratchet 209 to lock, the locking block 207 is arranged inside the mandrel 301, the boss on the locking block 207 is assembled on the ratchet 209, the ratchet 209 is assembled on the mandrel 301 through the central shaft 208, the boss on the locking block 207 simultaneously plays a role in fixing the motion track of the ratchet 209, the rotation angle of the ratchet 209 drives the locking block 207 to rotate to slide out of the mandrel 301, locking piece 207 and the frame gear engagement of coiler 3 body, locking piece 207 opposite side is fixed in dabber 301 simultaneously, and it is fixed to drive dabber 301, and dabber 301 is fixed back will organize the winding and can't pull out at the meshbelt of dabber 301 to play first branch meshbelt 101 and second branch meshbelt 8 and can fix the user effect.

As a preferable scheme, a ratchet 209 is fixed on the shaft of a mandrel 301, an inertia block is matched on the mandrel 301 through a round mandrel, the ratchet shaft is provided with two buckles, the inertia block is matched with the buckles on the ratchet shaft and is matched on the ratchet 209, because the inertia block is fixed on the ratchet 209 through the buckles on the ratchet 209 and has a certain gap and can rotate and move at a certain angle, when the ratchet 209 moves along with the mandrel 301 in a rapid acceleration mode, because the gap difference exists in the assembly of the inertia block, inertia effect can be caused, movement is delayed, the pawl can be pushed to move after being delayed, the pawl moves to be meshed with a gear on a mechanical plate 205, the inertia block cannot move, so that the ratchet 209 is driven to be incapable of moving, the ratchet 209 prevents a locking block 207 from moving, the locking block 207 slides out around an assembly track to be meshed with a frame gear, so that the movement of the mandrel 301 is prevented, and a first division, further plays a role in locking and restraining the user.

As a preferred scheme, 6 riveting of gas generator are on the return bend on coiler 3, the riveting end is sealed through the riveting, external circuit signal line simultaneously, the return bend passes through the metal sheet riveting on safety belt 1 body, be provided with a plurality of metal ball 204 in the return bend, be provided with the working of plastics in the return bend, the working of plastics is fixed in the return bend, gas generator 6 receives external current signal input, produce a large amount of gas, promote metal ball 204 motion in the return bend, metal ball 204 enters into dabber 301 inslot, promote dabber 301 motion, play dabber 301 and rotate, drive the first minute belt 101 of winding on dabber 301 and retrieve, restraint user's effect has been played.

A method of operating a child seat belt 1 protection device comprising the steps of:

step 1, a user is in a seat, a bolt 102 at the end part of a first sub-weaving belt 101 is buckled with a buckle 4 on a second sub-weaving belt 8, and a chest buckle on a safety belt 1 is connected together;

step 2, the control system 5 continuously collects information, calculates the state of the coordinate seat through acceleration and angle change, and sends a signal to the pre-tightening pull-back device, a generator in the pre-tightening pull-back device quickly releases gas to push the pre-tightening pull-back device, so that the safety belt 1 is quickly recovered, the gap between the woven belt and a user is reduced, and the sitting posture of the user is corrected;

step 3, connecting the first branch weaving belt 101 with the retractor 3, fixing the retractor on a seat through a bolt, and controlling the system 5 to operate in real time;

step 4, the retractor 3 in the safety belt 1 has an emergency locking function, and plays an emergency locking role through the belt sensitive mechanism and the angle sensitive mechanism 201, and the retractor can move freely when being normally matched;

step 5, when the belt sensitive angle mechanism monitors acceleration, the winder receives signals, the first woven belt 101 is tightened, the ratchet 209 is assembled on the mandrel 301 through the central shaft 208, meanwhile, a boss on the locking block 207 plays a role in fixing the motion track of the ratchet 209, the ratchet 209 rotates to drive the locking block 207 to rotate and slide out of the mandrel 301, the teeth of the locking block 207 are meshed with the frame gear to be locked, meanwhile, the other side of the locking block 207 is fixed in the mandrel 301 to drive the mandrel 301 to be fixed, after the mandrel 301 is fixed, the woven belt wound on the mandrel 301 can not be pulled out, and a user can be fixed;

step 6, when the acceleration of the first division tape 101 reaches a certain threshold value, due to the inertia effect, the inertia block acts in a delayed way to poke the locking mechanism 210, and the first division tape 101 cannot be pulled out;

step 7, when the gravity effect occurs simultaneously, the metal ball 204 is in the base 202, when the metal ball 204 is inclined at a certain angle, because the metal ball 204 receives the gravity effect, the metal ball 204 moves to toggle the locking mechanism 210, the first webbing 101 cannot be pulled out or the retractor 3 generates speed displacement, the base 202 can also toggle the locking mechanism 210 due to the inertia effect, and the first webbing 101 cannot be pulled out, thereby fixing the user.

The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the embodiments, and various equivalent changes can be made to the technical solution of the present invention within the technical idea of the present invention, and these equivalent changes are within the protection scope of the present invention.

Claims

1. A safety belt protection device for a child seat, characterized in that it comprises a safety belt provided on the seat with a restraint for a user, a pretension recovery device disposed at one end of the safety belt, and a pretensioning recovery device disposed on the pretensioner A retractor on the side of the retracting device, a lock on the seat belt, and a control system connected with the preloading and retracting device;

The pre-tensioning and pulling-back device includes a gas generator arranged inside the seat. When not in use, the safety belt and the pre-tensioning and pulling-back device are fixed on the seat, and the control system is fixed on the seat. on the inner bracket.

2 . The safety belt protection device for a child seat according to claim 1 , wherein the safety belt is connected with a first sub-webbing, and the end of the first sub-webbing is connected with the retractor. 3 . At the same time, the lock tongue arranged on the other end of the first sub-webbing belt, the lock buckle that is snapped together with the lock tongue, the other end of the lock buckle is connected with the second sub-webbing belt, and the second sub-webbing belt is connected together. One end of the webbing is attached to the seat.

3 . The safety belt protection device for a child seat according to claim 2 , wherein the retractor comprises a retractor body, a mandrel disposed on the retractor body, and the first The ends of one sub-webbing are sewed together transversely along the length direction of the first sub-webbing to form an insertable space, the end of the first sub-webbing passes through the plug rod, and the first sub-webbing passes through the plug rod fixed on the mandrel, the first sub-webbing is wound on the mandrel, the first sub-webbing passes through the mandrel, and is arranged on the coil spring on one side of the mandrel;

When the first sub-webbing is pulled out to the set length, the coil spring generates a rewinding force, the first sub-webbing bears the retracting force, and the first sub-webbing is automatically recovered.

4 . The safety belt protection device for a child seat according to claim 1 , wherein the pre-tightening and pulling-back device further comprises an angle-sensitive mechanism; 5 .

The angle-sensitive mechanism includes a base arranged on the side of the retractor body, an upper cover that is rotatably fitted on the base, and a metal ball arranged on the base, which is rotatably fitted on the retractor body. The mechanical board is provided with grooves on the top of the base.

5 . The safety belt protection device for a child seat according to claim 3 , wherein the angle-sensitive mechanism further comprises a locking block arranged above the mandrel, and the upper boss of the locking block is assembled on the On the ratchet wheel, the central shaft is arranged above the mandrel. The rotation angle of the ratchet wheel drives the locking block to rotate and slide out of the mandrel. The teeth of the locking block engage with the frame gear of the retractor body to lock and lock The other side of the block is fixed in the mandrel, which drives the mandrel to be fixed. After the mandrel is fixed, the first sub-webbing that wraps the tissue around the mandrel cannot be pulled out, so that the webbing can fix the user.

6. A child seat belt protection device according to claim 4, wherein the metal ball can move freely in the groove;

The angle-sensitive mechanism is in the base through the metal ball. When it is inclined at a certain angle, the metal ball moves and toggles the locking mechanism due to the effect of gravity. The first webbing cannot be pulled out or the retractor produces acceleration displacement. The inertial action will also toggle the locking mechanism, and the first sub-webbing cannot be pulled out.

7. A child seat safety belt protection device according to claim 5, wherein the safety belt retractor has a limited force function, and after the safety belt is locked, when a certain force value is reached, the safety belt retracts The torsion bar in the receiver, the torsion bar is a metal rod, and the torsion metal rod plays the role of releasing force, reducing the injury caused by the excessive force value of the user being restrained.

8 . The safety belt protection device for a child seat according to claim 1 , wherein the control system comprises a pressure sensor arranged under the seat. 9 .

9 . The safety belt protection device for a child seat according to claim 2 , wherein the pre-tightening and retracting device further comprises a gas generator arranged inside the safety belt, and the gas generator is connected to the safety belt. 10 . Control system signal connections.

10. A working method of a child seat belt protection device, characterized in that it comprises the following steps:

Step 1. When the user is in the seat, the lock tongue at the end of the first sub-webbing is fastened with the lock on the second sub-webbing, and at the same time, the chest buckle on the seat belt is connected together;

Step 2. The control system continuously collects information, calculates the coordinate seat state through acceleration and angular changes, and sends a signal to the pre-tensioning and pulling-back device. The seat belt is quickly recovered, reducing the gap between the webbing and the user, and correcting the user's sitting posture;

Step 3. Connect with the retractor through the first sub-webbing, the retractor is fixed on the seat by bolts, and the control system is in real-time operation;

Step 4. The inner retractor of the seat belt has an emergency locking function, which plays an emergency locking function through the angle-sensitive mechanism, and can move freely when it is normally equipped;

Step 5. When the belt-sensitive angle mechanism monitors the acceleration, the winder receives the signal, the first sub-webbing is tightened, the ratchet wheel is assembled on the mandrel through the central shaft, and the boss on the locking block plays the role of fixing the movement track of the ratchet wheel. , the rotation angle of the ratchet drives the locking block to rotate and slide out of the mandrel, the teeth of the locking block mesh with the frame gear and lock, and the other side of the locking block is fixed in the mandrel, which drives the mandrel to be fixed. The webbing wrapped around the mandrel cannot be pulled out, which can fix the user;

Step 6. When the acceleration of the first sub-webbing reaches a certain threshold, due to inertial action, the inertia block delays the action to toggle the locking mechanism, and the first sub-webbing cannot be pulled out;

Step 7. When the action of gravity occurs at the same time, the metal ball is in the base. When the metal ball is tilted at a certain angle, due to the action of gravity, the metal ball moves and toggles the locking mechanism, and the first sub-webbing cannot be pulled out or the retractor produces Speed displacement, the base will also toggle the locking mechanism due to the inertial action, and the first sub-webbing cannot be pulled out, thus fixing the user.