Pneumatic jacking device for active protection hood system

Abstract

The pneumatic jacking device for the active protective hood system comprises a sleeve, an inner cavity of the sleeve is slidably connected with a piston block, the top of the piston block is fixedly connected with a piston rod, and the top end of the piston rod is fixedly connected with a lifting table; according to the pneumatic jacking device for the active protection hood system, the multi-buffering function can be achieved through the arrangement of the buffering pad and the buffering mechanism, the protection effect on collided pedestrians is improved, when the pedestrians collide with an engine hood, a buffering block drives a connecting rod to drive a sliding block to slide along a limiting rod, and therefore the safety of the pedestrians is improved. The springs are synchronously compressed and deformed to efficiently absorb the collision kinetic energy, so that the impact force transmitted to pedestrians is greatly weakened, and the collision injury is reduced to the minimum; through the arrangement of the fixing mechanism, the function of quickly disassembling and assembling the jacking block is achieved, no complex tool is needed, the operation process is simple and convenient, the aged protection pad can be efficiently replaced, the maintenance time and difficulty are reduced, and operation is convenient and fast.

Description

Technical Field

[0001] This invention relates to the field of pneumatic lifting device technology, specifically a pneumatic lifting device for an active protective hood system. Background Technology

[0002] With the rapid development of the automotive industry, road traffic safety has received increasing attention. Pedestrian protection, as a crucial component of the vehicle's passive safety system, has seen continuous upgrades in its technological research and application. The active hood protection system, a key device for enhancing pedestrian collision protection performance, functions by rapidly lifting the hood through a jacking mechanism at the moment of collision between a vehicle and a pedestrian. This creates a buffer space, reducing the impact force on the pedestrian's head and torso against the hard hood and its underlying components, thereby mitigating the severity of injury. The jacking mechanisms used in active hood protection systems mainly fall into three categories: pneumatic, hydraulic, and electric. Among these, pneumatic jacks have become a mainstream application due to their advantages such as fast response, compact structure, and sufficient instantaneous thrust. They typically generate high-pressure gas through a gas-generating mechanism, which drives a piston rod to move the jacking components, achieving a rapid hood lifting action.

[0003] Most existing pneumatic hood lifters rely solely on a single elastic component for cushioning, resulting in poor performance and an inability to effectively absorb the instantaneous kinetic energy of a pedestrian impact. Furthermore, the lifting end of these lifters typically requires a protective pad to prevent direct abrasion of the hood and to aid in cushioning. These pads are prone to aging and damage over time, necessitating periodic replacement. Since the lifting end is usually connected to the main structure via bolts, replacement requires disassembling multiple components, making the process cumbersome, time-consuming, and labor-intensive, increasing maintenance costs and cycles. Therefore, we propose a pneumatic hood lifter for an active protective hood system. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a pneumatic lifter for an active protective hood system. This solves the problems of pneumatic lifters, which mostly rely on a single elastic component for cushioning, resulting in poor cushioning performance and an inability to effectively absorb the instantaneous kinetic energy of a pedestrian impact. Furthermore, the lifting end of the pneumatic lifter typically requires a protective pad to prevent direct abrasion of the hood and to assist in cushioning; however, these pads are prone to aging and damage after prolonged use, requiring periodic replacement. The lifting end is mostly connected to the main structure via bolts, necessitating the disassembly of multiple components for replacement, which is cumbersome, time-consuming, and labor-intensive, increasing maintenance costs and cycle time.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A pneumatic lifter for an active protective hood system includes a sleeve, a piston block slidably connected to the inner cavity of the sleeve, a piston rod fixedly connected to the top of the piston block, a lifting platform fixedly connected to the top of the piston rod, and a gas generating mechanism for moving the piston block inside the sleeve. The inner wall of the lifting platform is fixedly connected to a fixed platform, and a buffer block is slidably connected to the inner cavity of the fixed platform. Multiple connecting columns are fixedly connected to the top of the buffer block in a circular array. The connecting columns are slidably connected to the fixed platform, and a connecting platform is fixedly connected to the top of the connecting columns. The lifting platform is equipped with a buffer mechanism for buffering the buffer block. A lifting block is provided on the top of the connecting platform, and a protective pad is fixedly connected to the top of the lifting block. The connecting platform is equipped with a fixing mechanism for installing the lifting block.

[0006] In a preferred embodiment, the gas-generating mechanism includes a hollow gas-generating propellant column fixedly connected to the inner cavity of the sleeve, an electric ignition tube fixedly connected to the bottom end of the inner cavity of the sleeve, and a constant pressure diaphragm installed in the inner cavity of the sleeve above the hollow gas-generating propellant column.

[0007] The technical effect of adopting the above-mentioned further solution is that the flame generated by the electric ignition tube ignites the hollow gas-producing column. When the hollow gas-producing column burns, it instantly produces a large amount of gas, which causes the gas pressure to rise. When the rated gas pressure is reached, the gas will break through the constant pressure membrane, thereby pushing the piston block to move.

[0008] In a preferred embodiment, an end cap is bolted to the top of the sleeve, the piston rod is slidably connected to the end cap, a first spring is sleeved on the outside of the piston rod and on one side of the piston block, and a sealing ring is installed on the outside of the piston block.

[0009] The technical effect of adopting the above-mentioned further solution is that the sealing effect can be enhanced by setting the sealing ring.

[0010] In a preferred embodiment, the buffer mechanism includes multiple limiting rods fixedly connected in a ring array to the inner cavity of the lifting platform. A slider is slidably sleeved on the outside of the limiting rod, and a connecting rod is rotatably connected to the outer side of the slider. The end of the connecting rod away from the slider is rotatably connected to the buffer block.

[0011] The technical effect of adopting the above-mentioned further solution is that the movement of the slider can be limited by the setting of the limit rod to prevent deviation, the movement of the buffer block drives the connecting rod to rotate, and the rotation of the connecting rod drives the slider to slide.

[0012] In a preferred embodiment, the slider is fitted against the inner wall of the lifting platform, a plurality of second springs are arranged in a circular array between the buffer block and the fixed platform, and a third spring is sleeved on the outer side of the limiting rod and on one side of the slider.

[0013] The technical effect of adopting the above-mentioned further solution is that the setting of the second and third springs can play a buffering role, thereby reducing the injury to the pedestrian who is hit.

[0014] In a preferred embodiment, the top of the connecting platform is provided with an annular groove and a circular groove. The fixing mechanism includes a plurality of support rods fixedly connected to the inner wall of the circular groove in an annular array. Insert blocks are slidably sleeved on the outside of the support rods. One end of the insert block extends into the interior of the annular groove. A fixing ring is fixedly connected to the bottom of the lifting block. The fixing ring is movably inserted into the annular groove. The interior of the fixing ring is provided with a plurality of slots arranged in an annular array to cooperate with the insert blocks.

[0015] The technical effect of adopting the above-mentioned further solution is that the movement of the insert block can be limited by the setting of the support rod to prevent displacement, and the position of the fixing ring can be locked by the movement of the insert block into the slot, which facilitates the quick disassembly and assembly of the lifting block.

[0016] In a preferred embodiment, a disc is rotatably connected to the inner cavity of the circular groove, and multiple inclined slots are arranged in a ring array inside the disc. A cylinder that cooperates with the inclined slots is fixedly connected to the bottom of the insert block.

[0017] The technical effect of adopting the above-mentioned further solution is that the rotation of the disc causes the inclined groove and the cylinder to cooperate, thereby squeezing and driving the cylinder to slide when the disc rotates, and the cylinder drives the insert block to slide along the support rod.

[0018] In a preferred embodiment, a rotating column is fixedly connected to the bottom of the disc, the rotating column is rotatably connected to the connecting platform via a bearing, a worm gear is fixedly sleeved on the outside of the rotating column, a fixing block is fixedly connected to the inner wall of the circular groove, and a worm gear that cooperates with the worm gear is rotatably connected between the fixing block and the connecting platform via a bearing, one end of the worm gear extends outside the connecting platform and is fixedly connected to a handle.

[0019] The technical effect of adopting the above-mentioned further solution is that the worm is rotated by the handle, the worm drives the rotating column to rotate through the worm wheel, and the rotating column drives the disk to rotate.

[0020] This invention provides a pneumatic lifter for an active protective hood system. Compared with the prior art, it has the following advantages: 1. This active protective hood system uses a pneumatic lifter, which, through the setting of buffer pads and buffer mechanisms, can play a multiple buffering function, improving the protection effect for pedestrians in collisions. The buffer mechanism forms a multi-level buffer energy absorption system through the synergistic action of the second spring, the third spring and the connecting rod slider. When a pedestrian hits the hood, the buffer block drives the connecting rod to drive the slider to slide along the limit rod, and the springs compress and deform synchronously, efficiently absorbing the impact kinetic energy, greatly weakening the impact force transmitted to the pedestrian, and minimizing the collision injury.

[0021] 2. This active protective cover system uses a pneumatic lifter, which enables quick assembly and disassembly of the lifting block through a fixed mechanism. Simply turn the handle at the end of the worm gear, and the worm wheel will drive the disc to rotate. The inclined groove will compress the cylinder to drive the insert block to slide along the support rod, thereby disengaging or engaging the insert block with the fixing ring slot. This allows for quick disassembly and installation of the lifting block without the need for complicated tools. The operation process is simple, and it can efficiently replace the aging protective pad, reducing maintenance time and difficulty. The system is easy to operate. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the sleeve of the present invention; Figure 3 This is an exploded view of the sleeve of the present invention; Figure 4 This is a schematic diagram of the lifting platform of the present invention; Figure 5 This is a schematic diagram of the internal structure of the lifting platform of the present invention; Figure 6 This is a schematic diagram of the structure of the fixing platform of the present invention; Figure 7 This is an exploded view of the fixing platform of the present invention; Figure 8 This is an exploded view of the connecting platform of the present invention; Figure 9 This is an enlarged view of part A of the present invention; Figure 10 This is a schematic diagram of the internal structure of the connecting platform of the present invention; Figure 11 This is a schematic diagram of the structure of the disk of the present invention.

[0023] Legend: 1. Sleeve; 11. End cap; 12. Piston block; 13. Hollow propellant column; 14. Electric ignition tube; 15. Pressure diaphragm; 16. First spring; 17. Piston rod; 18. Sealing ring; 2. Lifting platform; 21. Sliding block; 22. Second spring; 23. Fixed platform; 24. Buffer block; 25. Third spring; 26. Limiting rod; 27. Connecting rod; 28. Connecting column; 3. Connecting platform; 31. Disc; 32. Annular groove; 33. Insert block; 34. Support rod; 35. Worm gear; 36. Rotating column; 37. Circular groove; 38. Worm wheel; 39. Inclined groove; 310. Cylinder; 311. Fixing block; 4. Lifting block; 41. Protective pad; 42. Fixing ring; 43. Slot. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Please see Figures 1 to 11 The present invention provides a technical solution: like Figures 1 to 5 As shown: A pneumatic lifter for an active protective hood system includes a sleeve 1, a piston block 12 slidably connected to the inner cavity of the sleeve 1, a piston rod 17 fixedly connected to the top of the piston block 12, and a lifting platform 2 fixedly connected to the top of the piston rod 17. The sleeve 1 is provided with a gas generating mechanism for moving the piston block 12. The gas generating mechanism facilitates the generation of gas, thereby pushing the piston block 12 to move. The piston block 12 drives the lifting platform 2 to move through the piston rod 17, facilitating the lifting of the hood. A fixed platform 23 is fixedly connected to the inner wall of the lifting platform 2. A buffer block 24 is slidably connected to the inner cavity of the fixed platform 23. Multiple connecting columns 28 are fixedly connected to the top of the buffer block 24 in a circular array. The connecting columns 28 are slidably connected to the fixed platform 23. A connecting platform 3 is fixedly connected to the top of the connecting columns 28. A buffer mechanism for buffering the buffer block 24 is provided inside the lifting platform 2. A lifting block 4 is provided on the top of the connecting platform 3. A protective pad 41 is fixedly connected to the top of the lifting block 4. A fixing mechanism for installing the lifting block 4 is provided inside the connecting platform 3.

[0026] In this design, the lifting block 4 facilitates the lifting of the hood, the protective pad 41 provides cushioning protection, the buffer mechanism cushions the impact force when a person falls onto the hood, reducing injury to the pedestrian, and the fixing mechanism allows for quick disassembly and assembly of the lifting block 4, facilitating replacement of the protective pad 41 when it ages.

[0027] like Figure 2 and Figure 3As shown: In this scheme, the gas generating mechanism includes a hollow gas generating propellant column 13 fixedly connected to the inner cavity of the sleeve 1. An electric ignition tube 14 is fixedly connected to the bottom end of the inner cavity of the sleeve 1. A constant pressure diaphragm 15 is installed in the inner cavity of the sleeve 1 above the hollow gas generating propellant column 13. An end cap 11 is installed at the top end of the sleeve 1 by bolts. A piston rod 17 is slidably connected to the end cap 11. A first spring 16 is sleeved on the outside of the piston rod 17 and on one side of the piston block 12. A sealing ring 18 is installed on the outside of the piston block 12.

[0028] In this scheme, the hollow gas-generating propellant column 13 is ignited by the electric ignition tube 14 to generate a flame. When the hollow gas-generating propellant column 13 burns, it instantly generates a large amount of gas, causing the gas pressure to rise. When the rated gas pressure is reached, the gas will break through the constant pressure membrane 15 and push the piston block 12 to move upward. The first spring 16 is compressed, and the piston block 12 drives the lifting platform 2 to move upward through the piston rod 17, which facilitates the lifting of the engine hood.

[0029] like Figures 5 to 7 As shown: In this scheme, the buffer mechanism includes multiple limiting rods 26 fixedly connected in a ring array to the inner cavity of the lifting platform 2. A slider 21 is slidably sleeved on the outside of the limiting rods 26. A connecting rod 27 is rotatably connected to the outer side of the slider 21. The end of the connecting rod 27 away from the slider 21 is rotatably connected to the buffer block 24. The slider 21 is in contact with the inner wall of the lifting platform 2. Multiple second springs 22 are arranged in a ring array between the buffer block 24 and the fixed platform 23. A third spring 25 is sleeved on the outside of the limiting rods 26 and on one side of the slider 21.

[0030] In this design, when a pedestrian comes into contact with the hood, the hood is compressed and slightly moved. The hood compresses and moves the lifting block 4 slightly downward. The lifting block 4, through the connecting platform 3 and the connecting column 28, causes the buffer block 24 to slide, compressing the second spring 22 and thus providing initial cushioning. Simultaneously, the downward movement of the buffer block 24 causes the connecting rod 27 to rotate, and the rotation of the connecting rod 27 causes the slider 21 to slide along the limiting rod 26, compressing the third spring 25 and further providing cushioning. This design creates multiple cushioning effects when a pedestrian collides with the hood, effectively absorbing the kinetic energy of the pedestrian impact and minimizing the injury caused by the pedestrian collision.

[0031] like Figures 8 to 11As shown: In this design, the top of the connecting platform 3 is provided with an annular groove 32 and a circular groove 37. The fixing mechanism includes multiple support rods 34 fixedly connected to the inner wall of the circular groove 37 in a circular array. Insert blocks 33 are slidably sleeved on the outside of the support rods 34. One end of the insert block 33 extends into the interior of the annular groove 32. The bottom of the lifting block 4 is fixedly connected with a fixing ring 42, which is movably inserted into the annular groove 32. The interior of the fixing ring 42 is provided with multiple slots 43 arranged in a circular array to cooperate with the insert blocks 33. A disc 31 is rotatably connected to the inner cavity of the circular groove 37. The interior of the disc 31 has multiple inclined slots 39 arranged in a ring. The bottom of the insert block 33 is fixedly connected to a cylinder 310 that mates with the inclined slots 39. The bottom of the disc 31 is fixedly connected to a rotating column 36, which is rotatably connected to the connecting platform 3 via a bearing. A worm gear 38 is fixedly sleeved on the outside of the rotating column 36. A fixing block 311 is fixedly connected to the inner wall of the circular slot 37. A worm 35 that mates with the worm gear 38 is rotatably connected between the fixing block 311 and the connecting platform 3 via a bearing. One end of the worm 35 extends to the outside of the connecting platform 3 and is fixedly connected to a handle.

[0032] In this solution, when the protective pad 41 needs to be replaced due to aging, the handle at one end of the worm gear 35 is turned, thereby causing the worm gear 35 to rotate. The worm gear 35 drives the rotating column 36 to rotate through the worm wheel 38. The rotating column 36 drives the disc 31 to rotate, so that the inclined groove 39 and the column 310 cooperate. When the disc 31 rotates, it squeezes and drives the column 310 to slide. The column 310 drives the insert block 33 to slide along the support rod 34, so that the insert block 33 moves out of the slot 43, thereby releasing the locking state of the fixing ring 42, making it easy to remove the lifting block 4. Place the fixing ring 42 at the bottom of the new lifting block 4 into the annular groove 32, and rotate the handle at one end of the worm 35 in the opposite direction. This causes the worm 35 to rotate in the opposite direction. The worm 35 drives the rotating column 36 to rotate in the opposite direction through the worm wheel 38. The rotating column 36 drives the disc 31 to rotate in the opposite direction, so that the inclined groove 39 and the column 310 cooperate. When the disc 31 rotates, it squeezes and drives the column 310 to slide. The column 310 drives the insert block 33 to slide along the support rod 34, so that the insert block 33 moves into the slot 43, thereby locking the position of the fixing ring 42, which facilitates the installation and fixing of the lifting block 4.

[0033] Working principle: In use, the device is connected to the active protective hood system via a wiring harness. When a car collides with a pedestrian, the electric ignition tube 14 ignites to produce a flame that ignites the hollow gas-generating propellant column 13. The hollow gas-generating propellant column 13 produces a large amount of gas instantly when it burns, causing the gas pressure to rise. When the rated gas pressure is reached, the gas will break through the constant pressure membrane 15 and push the piston block 12 to move upward. The first spring 16 is compressed. The piston block 12 drives the lifting platform 2 to move upward via the piston rod 17. The lifting platform 2 drives the lifting block 4 to move upward via the connecting platform 3. The lifting block 4 lifts the hood a certain distance, thereby buffering the impact force of the human body falling on the hood and reducing the injury to the pedestrian. When the lifting block 4 contacts the hood, the protective pad 41 will play a buffering and protective role. When the pedestrian contacts the hood, it will squeeze and drive the hood to move slightly. The hood squeezes and drives the lifting block 4 to move slightly downward. The lifting block 4 drives the buffer block 24 to slide through the connecting platform 3 and the connecting column 28. The second spring 22 is compressed, thus playing a preliminary buffering role. At the same time, the downward movement of the buffer block 24 drives the connecting rod 27 to rotate. The rotation of the connecting rod 27 drives the slider 21 to slide along the limit rod 26. The third spring 25 is compressed, further playing a buffering role. It can form a multiple buffering effect when the pedestrian collides with the hood, thereby effectively absorbing the kinetic energy of the pedestrian impact and minimizing the damage caused by the pedestrian impact. When the protective pad 41 needs to be replaced due to aging, turn the handle at one end of the worm gear 35 to drive the worm gear 35 to rotate. The worm gear 35 drives the rotating column 36 to rotate through the worm wheel 38. The rotating column 36 drives the disc 31 to rotate, so that the inclined groove 39 and the column 310 cooperate. When the disc 31 rotates, it squeezes and drives the column 310 to slide. The column 310 drives the insert block 33 to slide along the support rod 34, so that the insert block 33 moves out of the slot 43, thereby releasing the locking state of the fixing ring 42 and making it easy to remove the lifting block 4. Place the fixing ring 42 at the bottom of the new lifting block 4 into the annular groove 32, and rotate the handle at one end of the worm gear 35 in the opposite direction. This causes the worm gear 35 to rotate in the opposite direction. The worm gear 35 drives the rotating column 36 to rotate in the opposite direction through the worm wheel 38. The rotating column 36 drives the disc 31 to rotate in the opposite direction, so that the inclined groove 39 and the column 310 cooperate. When the disc 31 rotates, it squeezes and drives the column 310 to slide. The column 310 drives the insert block 33 to slide along the support rod 34, so that the insert block 33 moves into the slot 43, thereby locking the position of the fixing ring 42. This makes it convenient to install and fix the lifting block 4, and the operation is convenient.

[0034] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0035] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, the phrase "comprising an element defined as..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0036] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pneumatic lifting device for an active protective hood system, comprising a sleeve (1), characterized in that: The inner cavity of the sleeve (1) is slidably connected to a piston block (12), the top of the piston block (12) is fixedly connected to a piston rod (17), the top of the piston rod (17) is fixedly connected to a lifting platform (2), and the inside of the sleeve (1) is provided with a gas generating mechanism for driving the piston block (12) to move. The inner wall of the lifting platform (2) is fixedly connected to a fixed platform (23). The inner cavity of the fixed platform (23) is slidably connected to a buffer block (24). The top of the buffer block (24) is fixedly connected to multiple connecting columns (28) in a ring array. The connecting columns (28) are slidably connected to the fixed platform (23). The top of the connecting columns (28) is fixedly connected to a connecting platform (3). The interior of the lifting platform (2) is provided with a buffer mechanism for buffering the buffer block (24). The top of the connecting platform (3) is provided with a lifting block (4). The top of the lifting block (4) is fixedly connected to a protective pad (41). The interior of the connecting platform (3) is provided with a fixing mechanism for installing the lifting block (4).

2. The pneumatic lifting device for an active protective hood system according to claim 1, characterized in that: The gas-generating mechanism includes a hollow gas-generating propellant column (13) fixedly connected to the inner cavity of the sleeve (1), an electric ignition tube (14) fixedly connected to the bottom end of the inner cavity of the sleeve (1), and a constant pressure diaphragm (15) installed in the inner cavity of the sleeve (1) above the hollow gas-generating propellant column (13).

3. The pneumatic lifting device for an active protective hood system according to claim 1, characterized in that: The top of the sleeve (1) is bolted with an end cap (11), the piston rod (17) is slidably connected to the end cap (11), a first spring (16) is sleeved on the outside of the piston rod (17) and on one side of the piston block (12), and a sealing ring (18) is installed on the outside of the piston block (12).

4. A pneumatic lifting device for an active protective hood system according to claim 1, characterized in that: The buffer mechanism includes multiple limiting rods (26) fixedly connected in a ring array to the inner cavity of the lifting platform (2). A slider (21) is slidably sleeved on the outside of the limiting rod (26). A connecting rod (27) is rotatably connected to the outer side of the slider (21). The end of the connecting rod (27) away from the slider (21) is rotatably connected to the buffer block (24).

5. A pneumatic lifting device for an active protective hood system according to claim 4, characterized in that: The slider (21) is in contact with the inner wall of the lifting platform (2), and multiple second springs (22) are arranged in a ring array between the buffer block (24) and the fixed platform (23). A third spring (25) is sleeved on the outside of the limiting rod (26) and on one side of the slider (21).

6. A pneumatic lifting device for an active protective hood system according to claim 1, characterized in that: The top of the connecting platform (3) is provided with an annular groove (32) and a circular groove (37). The fixing mechanism includes a plurality of support rods (34) fixedly connected in an annular array to the inner wall of the circular groove (37). The support rods (34) are slidably sleeved with inserts (33). One end of the inserts (33) extends into the interior of the annular groove (32). The bottom of the lifting block (4) is fixedly connected with a fixing ring (42). The fixing ring (42) is movably inserted into the annular groove (32). The interior of the fixing ring (42) is provided with a plurality of slots (43) arranged in an annular array to cooperate with the inserts (33).

7. A pneumatic lifting device for an active protective hood system according to claim 6, characterized in that: The inner cavity of the circular groove (37) is rotatably connected to a disc (31), and the interior of the disc (31) is provided with multiple inclined grooves (39) in a ring array. The bottom of the insert (33) is fixedly connected to a cylinder (310) that cooperates with the inclined grooves (39).

8. A pneumatic lifting device for an active protective hood system according to claim 7, characterized in that: A rotating column (36) is fixedly connected to the bottom of the disc (31). The rotating column (36) is rotatably connected to the connecting platform (3) through a bearing. A worm gear (38) is fixedly sleeved on the outside of the rotating column (36). A fixing block (311) is fixedly connected to the inner wall of the circular groove (37). A worm (35) that works with the worm gear (38) is rotatably connected between the fixing block (311) and the connecting platform (3) through a bearing. One end of the worm (35) extends to the outside of the connecting platform (3) and is fixedly connected to a handle.

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