Automotive safety tensioner

Abstract

The application relates to a safety tensioning device for a vehicle, which is provided with a belt winding assembly connected with a main shaft on a seat body, the belt winding assembly comprising a belt winding disc and a winding spring, and the seat body is provided with a stop plate and a pressing plate at the front and back thereof; a handle is pivotally connected with the seat body and can rotate around the main shaft; a driving pawl is rotatably connected with the handle; the seat body is provided with three operation sections at the top of the seat body, which are matched with limiting blocks on the driving pawl, and the three operation sections are a tensioning section, a working section and a releasing section; when the limiting blocks on the driving pawl are limited in the working section, the driving pawl and the pressing plate are all disengaged from the ratchet wheel, the stop plate is engaged with the ratchet wheel, the moment M1 generated by the stop plate on the belt winding disc is smaller than the moment M2 generated by the winding spring on the main shaft, and the belt can be tightened by the winding spring when the belt is relaxed. The safety tensioning device can automatically wind the belt when the belt is relaxed due to the bumping in the working state, so that the belt can always keep in the tensioning state and the unhooking is prevented, and the use safety is greatly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of automobile safety tensioning device for fixing and fastening goods on vehicle such as car, trailer, airplane, ship and the like. BACKGROUND

[0002] The automobile safety tensioning device is generally composed of a tensioning device main machine, a long strap, a short strap and the like. The strap is usually a flat woven strap, with or without hooks. The main machine part adopts the principle of anti-reverse ratchet mechanism, directly drives the driving pawl with a handle, the driving pawl pushes the ratchet, and the ratchet directly drives the main shaft, so as to tighten the strap wound on the main shaft. The stop plate prevents the ratchet from reversing, so that a certain tension can be maintained on the strap to bind and fix the goods. According to different application occasions, the working length of the device will also be different, so there will always be excess strap floating outside the device, which has certain safety hazards, and is very messy after use, affecting the next use.

[0003] At present, there are some products on the market that can automatically wind and bind the strap, such as the "automatic strap winding tensioning device" applied by the applicant early, with publication number CN100391645C, which is provided with a ratchet winding disc and uses a scroll spring to store energy to automatically wind the strap. This method can solve the above problems, but still has some other problems. For example, since there are many turns of woven strap wound on the winding disc, the woven strap on the tightly wound winding disc will be slowly pulled out during use and stress due to the jolt and vibration of the car, resulting in a gradual decrease in the tension on the woven strap. The jolt may also cause the goods to slip and the woven strap to loosen, or even the hooks to come off, causing the goods to lose restraint and causing a safety accident.

[0004] In addition, after use, the woven strap should be automatically wound into the winding disc, but after long-term use, the scroll spring that generates power will have a phenomenon of spring force decay, or even breakage and loss of spring force, resulting in that the woven strap cannot be completely wound or cannot be automatically wound.

[0005] In summary, the existing automobile safety tensioning device needs to be further improved. SUMMARY

[0006] The first technical problem to be solved by the present application is to provide an automobile safety tensioning device that can automatically wind the woven strap again in the case of woven strap loosening during use, so that the woven strap of the tensioning device in working state can always maintain tension to prevent the hooks from coming off and improve safety.

[0007] The second technical problem to be solved by the present application is to provide an automobile safety tensioning device that can completely wind the woven strap into the winding disc after the scroll spring force decays or fails.

[0008] The technical scheme adopted by the present application to solve the first technical problem is: the automobile safety tensioning device comprises a seat body, a handle and a first binding belt, the seat body is provided with a winding belt assembly connected with a main shaft, the winding belt assembly comprises a winding belt disc provided with a ratchet and a winding spring, a stop plate and a pressing plate are arranged on the front and back of the seat body respectively, the handle is pivotally connected with the seat body and can rotate around the main shaft, and the rotating handle can change the action state of the stop plate and the pressing plate on the ratchet, a driving pawl matched with the ratchet is rotatably connected with the handle, and the top of the seat body is provided with three operation sections matched with the limiting blocks on the driving pawl, which are a tensioning section, a working section and a releasing section, when the limiting blocks on the driving pawl are limited in the working section, the driving pawl and the pressing plate are both in a disengaged state with the ratchet, the stop plate is in an engaged state with the ratchet, the torque M1 generated by the stop plate on the winding belt disc is smaller than the torque M2 generated by the winding spring on the main shaft, i.e. M1 < M2, and the belt can be tightened by the winding spring under the condition of relaxation. In this way, under the working condition, when the belt relaxation phenomenon occurs, such as the moment of jolt, the ratchet can rotate counterclockwise under the action of the winding spring, the stop plate is pushed up, and the stop plate returns to the root of the ratchet to keep engagement after crossing a tooth or several teeth.

[0009] The tensioning device with the foregoing structure is characterized in that the bottom edge of the handle is respectively provided with a first protrusion and a second protrusion in front and back of the handle for pushing the stop plate and the pressing plate, so as to change the action state of the stop plate and the pressing plate on the ratchet by rotating the handle, i.e. the stop plate and the ratchet have an engaged state or a disengaged state, and the pressing plate and the ratchet have a close state or a disengaged state.

[0010] In addition, a push block is arranged at the rear end of the driving pawl for pushing the pressing plate to rotate, and the pressing plate is rotated to disengage from the ratchet through the push block. According to the conventional design, the function of the stop plate is to prevent the ratchet from reversing, and the function of the pressing plate is to control the rotating speed of the ratchet, wherein the forward rotation (counterclockwise direction shown in the figure) of the ratchet is the winding direction of the belt, and vice versa.

[0011] The tensioning device with the foregoing structure is characterized in that the tensioning section, the working section and the releasing section are separated by a plurality of protrusions formed on the upper edge of the side wall of the seat body, and the tensioning section, the working section and the releasing section are sequentially arranged in front and back, when the limiting blocks on the driving pawl are limited in the tensioning section, the handle can be operated to tighten, i.e. the ratchet can be rotated to wind the belt and tighten, and tension is generated.

[0012] When the limiting block on the active pawl is limited in the release area, the active pawl and the stop plate are both disengaged from the ratchet, and the pressure plate is in close contact with the ratchet, and the torque M3 generated by the pressure plate on the tape reel is greater than the torque M2 generated by the spring on the main shaft, that is, M3>M2, so that the (ratchet) tape reel cannot rotate freely. When the button is pressed and the pressure plate is pushed open by the push block, the ratchet can rotate freely to wind the tape.

[0013] The tensioning device of the foregoing structure is further covered with a shroud in front of the seat body, and the shroud and the seat body are provided with inter-engaging notches and barbs, so that the shroud is not easy to come off after being installed; and a groove for limiting placement of the hook of the first strap is arranged in front of the shroud, which plays a buffering role when the hook is quickly retracted.

[0014] Better, a connecting hole is further arranged at the bottom of the seat body, and the seat body can be fixed on a corresponding position of a vehicle or goods through a connecting member (such as a bolt, a rivet, etc.), so that the second strap is not needed.

[0015] The technical solution adopted by the present application to solve the second technical problem is that a hand wheel assembly capable of manually winding the tape is further connected to one side of the main shaft relative to the spring, and the hand wheel assembly mainly comprises a hand wheel capable of driving the main shaft to rotate. The main shaft is directly driven to rotate by the hand wheel, and the tape reel is driven to rotate to wind the tape, so that the tape can be supplemented to be wound when the tape cannot be completely automatically retracted.

[0016] The main shaft and the hand wheel can be in a split or integrated structure, and if a split structure is adopted, the two can be matched with a special-shaped head and a special-shaped hole, and then fixed by a screw.

[0017] Better, the hand wheel assembly further comprises a damping elastic member for reducing the rotation speed of the main shaft when the first strap is retracted at a too fast speed. The damping elastic member can be a compression spring, and is arranged between the hand wheel and the seat body to increase the friction damping between the main shaft and the seat body, so as to slow down the tape retraction speed and prevent the hook from quickly bouncing back to hurt the operator.

[0018] The hand wheel can be of different types, such as a disc-shaped hand wheel or a vane-shaped hand wheel, and when a vane-shaped hand wheel is adopted, a hand wheel box fixed with the seat body is arranged on the outer periphery of the hand wheel to avoid the fast rotating hand wheel from colliding with the operator's hand during automatic tape retraction.

[0019] Compared with the prior art, the automobile safety tensioning device has the advantages that the moment M1 generated by the stop plate on the tape winding disc is smaller than the moment M2 generated by the winding spring on the main shaft in the working state, so that the tape winding disc can automatically wind the tape. Therefore, the automobile safety tensioning device can automatically wind the tape in the releasing state and automatically wind the tape when the tape is loosened due to jolting in the working state, so that the tape is always kept in the tensioned state and the hooking-off is prevented, and the use safety is greatly improved. Meanwhile, the tape can be wound by the hand wheel when the winding spring is invalid, and the damping can control the winding speed, so that the hooking-off of the tape in the winding process is avoided and the accidents of the operator or others are avoided. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a perspective exploded view of the embodiment one of the present application;

[0021] Figure 2 is a perspective view of the embodiment one of the present application;

[0022] Figure 3 is a front view of the embodiment one of the present application;

[0023] Figure 4 is a top view of the embodiment one of the present application;

[0024] Figure 5 is an exploded view of the seat body assembly of the present application;

[0025] Figure 6 is an assembled view of the seat body and the cover of the present application;

[0026] Figure 7 is a sectional view of the hook fully retracted on the first tape of the present application;

[0027] Figure 8 is an exploded view of the handle assembly of the present application;

[0028] Figure 9 is an axial sectional view of the embodiment one of the present application;

[0029] Figure 10a is an exploded view of the hand wheel assembly of the embodiment one of the present application;

[0030] Figure 10b is an exploded view of the hand wheel assembly of the embodiment two of the present application;

[0031] Figure 10c is a front view of the embodiment two of the present application;

[0032] Figure 11 is a sectional view of the releasing state of the present application;

[0033] Figure 12 is a sectional view of the tensioning operation state of the present application;

[0034] Figure 13 is a working state sectional view of the present application;

[0035] Figure 14 is an automatic take-up state sectional view of the present application;

[0036] Figure 15 is a torque schematic diagram of the present application.

[0037] Wherein: main machine 1, seat body assembly 11, seat body 111, tension area 111a, working area 111b, release area 111c, barb 111d, connecting hole 111e, stop plate 112, stop plate spring 113, support plate 114, pressing plate 115, pressing plate front end 115a, pressing plate rear end 115b, pressing plate spring 116, connecting shaft 117, shroud 118, notch 118a, groove 118b, threading hole 118c, handle assembly 12, handle 121, cavity 121a, hole 121b, groove 121c, first protrusion 121d, second protrusion 121e, hole 121f, driving pawl 122, limit block 122a, button 122b, push block 122c, protruding core 122d, pawl spring 123, take-up assembly 13, take-up reel 131, ratchet wheel 132, winding drum 133, shaft sleeve 134, main shaft 135, first end 135a, second end 135b, circlip 136, take-up spring 137, take-up spring box 138, rivet 139, hand wheel assembly 14, hand wheel 141, hand wheel box 142, damping spring 143, screw 144, first bandage 2, braid 21, hook 22, second bandage 3, braid 31 DETAILED DESCRIPTION

[0038] The present application is described in further detail below in conjunction with the embodiments of the drawings.

[0039] Example One:

[0040] As shown in the drawings, the automobile safety tensioning device of the present embodiment mainly comprises a main machine 1, a first bandage 2 and a second bandage 3. Figures 1 to 4

[0041] The main machine 1 comprises a seat body assembly 11, a handle assembly 12, a take-up assembly 13 and a hand wheel assembly 14. At least one first bandage 2 with or without a hook is needed to be connected with the main machine 1. Preferably, the first bandage 2 comprises a braid 21 that can be wound into a braid reel and a hook 22. The second bandage 3 comprises a short braid 31 and a hook 22.

[0042] ​The seat body assembly 11 includes a seat body 111, a front end provided with a protective cover 118, a support plate 114, a stop plate 112 and a stop plate spring 113, a rear end provided with a pressing plate 115 and a pressing plate spring 116, and a connecting shaft 117 pivotally connected with the seat body 111. The connecting shaft 117 is also used for connecting the second binding belt 3. The stop plate 112 can be sliding type or swinging type, and the sliding type is shown in the figure. The stop plate spring 113 can be a compression spring or a torsion spring, and the compression spring is taken as an example in the figure.

[0043] The handle assembly 12 includes a handle 121, a driving pawl 122 and a pawl spring 123. The pawl 122 is provided with protruding limiting blocks 122a on both sides of the front end, a button 122b in the middle of the rear end, and push blocks 122C on both sides of the rear end.

[0044] As shown in Figure 5 , the top of the seat body 111 is divided into three concave operation sections by several protrusions on the upper edge of the side wall, which are a tensioning section 111a, a working section 111b and a releasing section 111c from front to back, used for placing the limiting blocks 122a, and different sections have different functions. In this embodiment, the seat body is located on the side of the first binding belt, and is front, and vice versa.

[0045] As shown in Figure 5 , the seat body 111 is U-shaped, and the front part is provided with the support plate 114 to fix the size of the U-shaped opening. The support plate 114 also supports the stop plate spring 113. The stop plate 112 slides radially relative to the shaft under the action of the spring 113 and tends to the shaft. The bottom of the front of the seat body 111 is provided with protruding barbs 111d on both sides, which are matched with the notches 118a below the protective cover 118. After being assembled, the barbs 111d and the notches 118a are clamped with each other, so that the protective cover 118 is not easy to be pulled out. The upper part of the protective cover 118 is also fixed with the seat body 111 by rivets 139. The lower part of the protective cover 118 is also provided with a groove 118b for limiting the hook 22 of the first binding belt 2, which plays a buffering role when the hook 22 is quickly retracted. The groove 118b is also provided with a belt passing hole 118c for the first binding belt 21 to pass through,

[0046] The bottom of the seat body 111 is also provided with a connecting hole 111e. The connecting hole 111e is used for the bolt or rivet to pass through, so that the main machine 1 is fixed on the corresponding position of the car or the cargo. In this way, the second binding belt 3 is no longer needed, and the main machine 1 plus the first binding belt 2 can work.

[0047] The rear of the base 111 is equipped with a connecting shaft 117, into which a second webbing 31 is inserted for connecting the main unit 1 and the second binding strap 3. At the same time, a pressure plate 115 and a pressure plate spring 116 are pivotally connected to the connecting shaft 117. Under the action of the spring force, the pressure plate 115 swings around the connecting shaft 117 as the axis, and the front end 115a of the pressure plate 115 tends to contact the ratchet 132, generating pressure to prevent the rotation of the reel 131.

[0048] like Figure 8 As shown, the handle assembly 12 includes a handle 121, an active pawl 122, and a pawl spring 123. The active pawl 122 has protruding limiting blocks 122a on both sides of its front end, a button 122b in the middle of its rear, push blocks 122c on both sides of its rear, and protruding cores 122d on both sides of its middle, serving as the rotation center for the active pawl's swing. The pawl spring 123 is sleeved on the protruding cores 122d. The handle 121 has a cavity 121a at its top to accommodate the button 122b, holes 121b on both sides for inserting the protruding cores 122d, and a groove 121c for placing the limiting blocks 122a. Holes 121f are used to insert the spindle 135 and the bushing 134. The bottom edge of the handle 121 has a first protrusion 121d and a second protrusion 121e at its front and rear, respectively, for pushing the stop plate 112 and the pressure plate 115.

[0049] like Figure 9 As shown, the tape winding assembly 13 includes a tape reel 131, a main shaft 135, a coil spring 137, and a bushing 134. The tape reel 131 is a disc-shaped assembly consisting of two ratchet wheels 132 and a drum 133, used for winding the webbing 21. The handle assembly 12 and the seat assembly 11 are pivotally connected via the bushing 134. The handle 121 is located inside the seat 111, while the tape reel 131 is located inside the handle 121 and centered thereon. The main shaft 135 passes through the bushing 134 and the tape reel 131 and is limited by a retaining spring 136. The main shaft 135 has an irregular cross-section, which mates with the irregular holes on the ratchet wheels 132, allowing the tape reel 131 to drive the main shaft 135 to rotate together, or in other words, the main shaft 135 can drive the tape reel 131 to rotate together. The first end 135a of the main shaft 135 is connected to the inner hook of the coil spring 137, and the outer hook of the coil spring 137 is connected to the coil spring box 138, which is fixed to the outer side of the base 111. The second end 135b of the main shaft is connected to the handwheel assembly 14.

[0050] The handwheel assembly 14 can adopt various different structural forms, as shown in the figure of this embodiment, specifically as follows: Figure 1 , 2, 3, 4, 9, 10a, the hand wheel assembly 14 includes hand wheel 141, damping elastic member 143, screw 144. The second end 135b of the main shaft 135 protruding, with the hand wheel 141 in the middle of the special-shaped hole, and then use the screw 144 to fix the hand wheel 141 on the main shaft 135, so that the rotation of the hand wheel 141 can drive the main shaft 135 rotation. And the hand wheel 141 and the seat 111 between the damping elastic member 143 is set to increase the friction, slow down the speed of the first strap 2 when the fast recovery, to avoid the hook 22 fast back injury operator, damping elastic member can be selected to use compression spring. The hand wheel 141 of the present application uses a common disc-shaped hand wheel.

[0051] Example two:

[0052] As Figure 10b , 10c, unlike the first embodiment, the present application uses a hand wheel, it is also used to fix the hand wheel 141 on the second end 135b of the main shaft with screw 144, to prevent the hand wheel 141 fast rotation when the hand of the operator, in the hand wheel 141 periphery is provided with hand wheel box 142, hand wheel box 142 is fixed in the side of the seat 111 with rivet 139.

[0053] Now combined with the figure, the dynamic process of the present application is described as follows:

[0054] As Figure 11 is a release state diagram. Press the button 122b, turn the handle assembly 12, put the limit block 122a into the release area 111c of the seat, at this time the driving pawl 122 is disengaged from the ratchet 132, and the stop plate 112 is opened by the first convex part 121d of the handle 121 to disengage the ratchet 132. In this state, the front end 115a of the pressing plate is still pressed against the ratchet 132 under the action of the spring 116, and the moment M3 generated by the ratchet 132 on the winding disc 131 is greater than the moment M2 generated by the winding spring, that is, M3>M2, so that the winding disc 131 cannot rotate freely after being pressed by the pressing plate 115.

[0055] Apply additional force to pull the first strap 2 out, at this time a moment M4 will be generated on the winding disc 131, if M4>M2, the winding disc 131 will overcome the pressure brought by the pressing plate 115, and rotate in the direction shown in the figure, that is, the hook 22 and the belt 21 are pulled out of the main machine, according to the actual needs, the hook 22 can be hung into the corresponding fixing point of the car or cargo.

[0056] As Figure 12, the hook 22 is hung in the corresponding fastening point, the button 122b is pressed, the handle assembly 12 is rotated, and the limiting block 122a is placed into the tensioning area 111a, so that the driving pawl 122 is engaged with the ratchet wheel 132. At this time, the first protrusion 121d of the handle 121 is turned downward and disengaged from the stop plate 112, and the stop plate 112 is pushed to the center of the winding drum 131 under the action of the spring 113 and engaged with the ratchet wheel 132. Repeatedly pushing the handle assembly 12 drives the winding drum 131 to rotate counterclockwise as shown in the figure, the webbing 21 is wound into the winding drum 131, and tension is generated to achieve the tensioning operation. And the stop plate 112 prevents the ratchet wheel 132 from reversing, so that the tension is maintained.

[0057] As Figure 13 , the above tensioning operation is completed, the button 122b is pressed, the handle assembly 12 is rotated, and the limiting block 122a is placed into the working area 111b, so that the driving pawl 122 is disengaged from the ratchet wheel 132. At the same time, the second protrusion 121e of the handle 121 pushes the front end 115a of the pressing plate 115 away and disengages from the ratchet wheel 132. At this time, only the stop plate 112 is engaged with the ratchet wheel 132 and prevents the ratchet wheel 132 from reversing, so that the tension is maintained, that is, the working state.

[0058] If bumps, vibrations, cargo slippage and other situations occur in the working state, the originally tensioned webbing 21 may become loose. At this time, the moment M1 generated by the stop plate 112 on the winding drum 131 is less than the moment M2 generated by the winding spring 137 on the main shaft 135, that is, M1 < M2. Under the action of the winding spring 137, the winding drum 131 overcomes the resistance of the stop plate 112 and rotates counterclockwise to wind the loose webbing 21 into the winding drum 131.

[0059] After use, the button 122b is pressed, the handle assembly 12 is rotated, and the limiting block 122a is placed into the release area 111c, as Figure 11 , the driving pawl 122 and the stop plate 112 are disengaged from the ratchet wheel 132, and the tension on the webbing 21 is released. At the same time, the second protrusion 121e of the handle 121 is away from the front end 115a of the pressing plate, and the front end 115a of the pressing plate rotates and presses on the ratchet wheel 132 under the action of the spring 116, preventing the winding drum 131 from rotating counterclockwise under the action of the winding spring, and preventing the first binding belt 2 with the hook 22 from quickly bouncing back to the operator.

[0060] As Figure 14 If you want to continue to retract the webbing 21 and the hook 22, you only need to press the button 122b on the driving pawl again, the push block 122c at the tail contacts and pushes the rear end 115b of the pressing plate 115 to rotate, so that the front end 115a is disengaged from the ratchet wheel 132. At this time, the winding drum rotates counterclockwise under the action of the winding spring 137 to wind the webbing 22 into the winding drum.

[0061] Further explanation of the relative torque on the winding drum 131, as Figure 15 M1 is the torque generated by the spring 113 to prevent the winding drum from counterclockwise rotation (reel tape). M2 is the torque generated by the wound spring 137 acting on the spindle 135 to drive the winding drum 131 counterclockwise rotation (reel tape). M3 is the torque generated by the pressure plate 115 pressing the ratchet 132 under the action of the spring 116 to prevent the winding drum 131 from counterclockwise rotation (reel tape) and clockwise rotation (tape out). The above three torques are generated by the elastic force of the elastic element arranged at the corresponding position (called passive torque). M4 is the torque generated by the external force pulling the tape 21 on the winding drum, which is only used to pull out the tape 21 before work or adjust the length of the tape 21. M5 is the torque generated by the external force pushing the handle 122 and the ratchet 132 to drive the winding drum 131 (called active torque), which is only used for tensioning operation.

[0062] In the case of the same diameter of the winding drum, the size of the active torque depends on the size of the applied external force, and the size of the passive torque depends on the size of the corresponding elastic force.

[0063] In order to achieve the functional effect as claimed in the present application, the size of the above three passive torques is limited as follows: M1 < M2 < M3.

[0064] When the active pawl limit block 122a is located in the working area, the pawl 122 and the pressure plate 115 are both disengaged from the ratchet 132, and since M1 < M2, the winding spring 137 can drive the spindle 135 and the winding drum counterclockwise and reel the tape 21 into.

[0065] When the active pawl limit block 122a is located in the release area, the pawl 122 and the stop plate 112 are both disengaged from the ratchet 132, and since M2 < M3, the ratchet cannot rotate. At this time, if a corresponding force is applied on the tape 21 to make M4 > M3, the winding drum 131 will rotate clockwise against the pressure of the pressure plate, and the tape 21 will be pulled out. Or press the button 122b to push the pressure plate 115 away from the ratchet 132, then the winding drum 131 will rotate counterclockwise only under the torque of M2, and the tape 21 can be quickly reeled back into the winding drum 131.

[0066] The elastic force of the winding spring 137 will inevitably decay to some extent after a period of use, resulting in the tape 21 not being completely reeled back. It is also possible that the winding spring will break, unhook, or other problems will occur under long-term use or other unexpected circumstances, resulting in complete failure of the automatic tape reeling function. At this time, you only need to rotate the hand wheel 141 counterclockwise to drive the spindle 135 and the winding drum 131 to rotate, and manually reel the tape 21 and the hook 22 back completely.

Claims

1. A safety tightening device for vehicle, comprising a seat body (111), a handle (121) and a first strap (2), the seat body (111) is provided with a strap winding assembly (13) connected with a main shaft (135), the strap winding assembly (13) comprises a strap winding disc (131) containing a ratchet (132) and a winding spring (137), a stop plate (112) and a pressing plate (115) are respectively arranged on the front and back of the seat body (111); the handle (121) is pivotally connected with the seat body (111) and can rotate around the main shaft (135), and the rotation of the handle (121) can change the action state of the stop plate (112) and the pressing plate (115) on the ratchet (132), a driving pawl (122) is rotatably connected with the handle (121), characterized in that: the top of the seat body (111) is provided with three operation sections matched with the limiting blocks (122a) on the driving pawl (122), which are a tightening section (111a), a working section (111b) and a releasing section (111c), wherein when the limiting blocks (122a) on the driving pawl (122) are limited in the working section (111b), the driving pawl (122) and the pressing plate (115) are both in a disengaged state with the ratchet (132), while the stop plate (112) is in an engaged state with the ratchet (132), and the moment M1 generated by the stop plate (112) on the strap winding disc (131) is less than the moment M2 generated by the winding spring (137) on the main shaft (135), i.e. M1 < M2, so that the strap (21) can be tightened by the winding spring (137) in a relaxed state.

2. The automotive safety tensioner of claim 1, wherein: the bottom edge of the handle (121) is respectively provided with a first protrusion (121d) and a second protrusion (121e) in front and back for pushing the stop plate (112) and the pressing plate (115), so that the rotation of the handle (121) can change the action state of the stop plate (112) and the pressing plate (115) on the ratchet (132), i.e. the stop plate (112) and the ratchet (132) have an engaged state or a disengaged state, and the pressing plate (115) and the ratchet (132) have a close state or a disengaged state.

3. The automotive safety tensioner of claim 2, wherein: the rear end of the driving pawl (122) is further provided with a push block (122c) for pushing the pressing plate (115) to rotate, and the pressing plate (115) is rotated to disengage from the ratchet (132) through the push block (122c).

4. The automotive safety tensioner of claim 3, wherein: the tightening section (111a), the working section (111b) and the releasing section (111c) are separated by a plurality of protrusions formed on the upper edge of the side wall of the handle (121), and the tightening section (111a), the working section (111b) and the releasing section (111c) are sequentially arranged in front and back.

5. The automotive safety tensioner of claim 4, wherein: When the limit block (122a) on the active pawl (122) is limited in the release area (111c), the active pawl (122) and the stop plate (112) are both disengaged from the ratchet (132), the pressing plate (115) is in close contact with the ratchet (132), and the moment M3 generated by the pressing plate (115) on the tape reel (131) is greater than the moment M2 generated by the coil spring (137) on the main shaft (135), i.e. M3>M2, so that the tape reel (131) cannot rotate freely.

6. The automotive safety tensioner of claim 1, wherein: The front part of the seat body (111) is further covered with a shroud (118), the shroud (118) and the seat body (111) are provided with inter-engaging notches (118a) and barbs (111d), and the front part of the shroud (118) is provided with a groove (118b) for limiting and placing the hook (22) of the first bandage.

7. The automotive safety tensioner of claim 1, wherein: The bottom of the seat body (111) is provided with a connecting hole (111e).

8. A motor vehicle safety tensioning device as claimed in any one of claims 1 to 7, characterised in that: The side of the main shaft (135) opposite to the coil spring (137) is further connected with a hand wheel assembly (14) for manually winding the webbing (21), the hand wheel assembly (14) mainly comprises a hand wheel (141) for driving the main shaft (135) to rotate.

9. The automotive safety tensioner of claim 8, wherein: The hand wheel assembly (14) further comprises a damping elastic member (143) for reducing the rotating speed of the main shaft (135) when the first bandage (2) is wound at a too fast speed.

10. The automotive safety tensioner of claim 8, wherein: The hand wheel (141) is a disc-shaped hand wheel or a vane-shaped hand wheel, and when the vane-shaped hand wheel is adopted, the outer part of the hand wheel is covered with a hand wheel box (142) fixed with the seat body (111).

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