阅读说明：本技术 缓冲型门扇防夹手装置 (Buffer type door leaf anti-pinch device ) 是由 黄海容 于 2018-06-10 设计创作，主要内容包括：本发明涉及一种缓冲型门扇防夹手装置。日常生活中经常会发生手被门扇夹伤的情况,造成严重损害。本发明由一个带锁止装置的压缩阻力随压缩速度自动调节的缓冲型气筒组件和气筒固定座配合辅助固定座或者配合斜面挡块、辅助定位座组成。本发明结构简单,使用方便,适用在各类开合式门和平移门上。可以根据门扇的闭合速度自动调节缓冲型门扇防夹手装置的阻力大小。门扇关闭的速度较小时,缓冲型门扇防夹手装置的阻力也较小,可以轻松地关闭房门。在门扇关闭的速度较大,有可能造成夹手事故时,自动增大缓冲型门扇防夹手装置的阻力,从而降低关门时门扇的闭合速度甚至通过锁止装置直接阻挡门扇关闭,有效防止门扇夹手的意外情况发生。(The invention relates to a buffer type door leaf hand clamping prevention device. In daily life, hands are often pinched by door leaves, and serious damage is caused. The invention is composed of a buffer type inflator component with a locking device and compression resistance which is automatically adjusted along with the compression speed, an inflator fixing seat matched with an auxiliary fixing seat or matched with an inclined plane stop block and an auxiliary positioning seat. The invention has simple structure and convenient use, and is suitable for various opening and closing doors and sliding doors. The resistance of the buffer type door leaf hand-clamping prevention device can be automatically adjusted according to the closing speed of the door leaf. When the door leaf is closed at a lower speed, the resistance of the buffer type door leaf hand clamping prevention device is lower, and the door can be easily closed. The speed of closing at the door leaf is great, when probably causing the tong accident, the resistance of automatic increase buffering type door leaf anti-pinch device to the closing speed of door leaf directly blocks the door leaf even through locking means and closes when reducing to close the door, effectively prevents the unexpected condition emergence of door leaf tong.)

1. The buffer type door leaf hand clamping prevention device comprises a buffer type air cylinder component (2-2), an air cylinder fixing seat (2-1), an auxiliary fixing seat (2-3) or an inclined plane stop block (2-5) and an auxiliary positioning seat (2-4); the method is characterized in that:

The air cylinder fixing seat (2-1) is sleeved at the bottom of a main air cylinder shell (12) of the buffer type air cylinder component (2-2), and a through hole is formed in the bottom of the air cylinder fixing seat (2-1);

The buffer type gas cylinder assembly (2-2) comprises a main piston mandril (38) which can move up and down, the upper part of the main piston mandril (38) is provided with a bearing (1) and a bearing shaft (2) for fixing the bearing, and the bearing (1) slightly protrudes out of the upper edge of the piston mandril (38); the main air cylinder shell (12) is sleeved outside the piston ejector rod (38), the piston at the lower part of the main piston ejector rod (38) can move up and down along the inner wall of the main air cylinder shell (12), and the main piston ejector rod (38) extends out of the main air cylinder shell (12) through the upper opening (30) of the main air cylinder shell; a unidirectional piston sealing ring (28) which is ventilated in a unidirectional way is sleeved in a lower groove (11) of the main piston mandril (38) and is elastically and airtightly fixed with the lower part of the main piston mandril (38); the outer wall of the one-way piston sealing ring (28) is elastically contacted with the inner wall of the main air cylinder shell (12); the return spring (27) is arranged in the main air cylinder shell (12), and two ends of the return spring (27) are respectively clamped between the bottom of the main piston mandril (38) and the elastic ventilation membrane (25); the elastic ventilation membrane (25) is clamped between the thread step (20) at the lower part of the main air cylinder shell (12) and the ventilation fixing seat (23); the main air cylinder shell (12) is in airtight connection with the ventilation fixing seat (23) through the thread matching of a main air cylinder sealing ring (22); the middle of the elastic ventilating membrane (25) is provided with an air leakage hole (13), and large ventilating holes (24) which are uniformly distributed are formed around the air leakage hole (13); the middle of the ventilation fixing seat (23) is provided with a ventilation adjusting nut (17), and the ventilation adjusting nut (17) is in threaded fit and airtight connection with the ventilation fixing seat (23) through a ventilation adjusting sealing ring (16); a main ventilation gap (18) is formed between the lower surface (19) of the elastic ventilation membrane (25) and the upper end surface (14) of the ventilation adjusting nut (17), and the size of the main ventilation gap (18) can be adjusted by rotating the ventilation adjusting nut (17); the middle of the ventilation adjusting nut (17) is provided with a hexagonal ventilation through hole (15); the supporting sleeve (7) is positioned in the middle of the interior of the main piston mandril (38) and is fixedly connected with the main piston mandril (38) through a sunk screw (9); a locking swing sheet rotating shaft (37) of the locking swing sheet (36) is fixed on the upper part of the supporting sleeve (7) through a through hole; a fork rod pin (4) is fixed on the upper part of the swinging piece fork rod (5), the fork rod pin (4) is also positioned in the swinging chute (3) of the locking swinging piece (36), and the locking swinging piece (36) can generate corresponding swinging by moving the swinging piece fork rod (5) up and down; the part of the locking swing piece (36) is positioned in an upper fork rod fork groove (35) of the swing piece fork rod (5); the swing piece fork rod (5) is positioned in the positioning through hole (6) of the support sleeve (7) and can slide up and down along the positioning through hole (6); the lower part of the swinging piece fork rod (5) is provided with internal threads which are matched and connected with the external threads on the upper part of a secondary piston mandril (8) of a secondary piston (10); the secondary piston sealing ring (29) is sleeved on the groove of the secondary piston (10) and is fixed with the secondary piston (10) in an airtight way; the secondary piston sealing ring (29) is elastically contacted with the inner wall of the main piston mandril (38); the secondary return spring (31) is positioned inside the main piston mandril (38), and two ends of the secondary return spring (31) are respectively clamped between the bottom of the support sleeve (7) and the secondary piston (10); a sleeve bolt opening (34) is formed in the position, corresponding to the swing sheet bolt (33) for locking the swing sheet (36), on the support sleeve (7); a main piston mandril bolt opening (32) is arranged at the position of the main piston mandril (38) corresponding to the swing sheet bolt (33).

2. The buffer type door leaf anti-pinch device as claimed in claim 1, wherein: the auxiliary fixing seat (2-3) is sleeved on the upper part of the main air cylinder shell (12) of the buffer type air cylinder component (2-2) and is tightly matched with the main air cylinder shell (12) of the buffer type air cylinder component (2-2).

3. The buffer type door leaf anti-pinch device as claimed in claim 1, wherein: the auxiliary positioning seat (2-4) is sleeved outside a main piston ejector rod (38) of the buffer type air cylinder assembly (2-2) and is loosely matched with the main piston ejector rod (38); the inclined plane stop block (2-5) is arranged on a door frame right above the axial direction of a main piston mandril (38) of the buffer type air cylinder component (2-2) and forms inclined plane matching with a bearing (1) of the main piston mandril (38).

Technical Field

The invention relates to a door leaf anti-pinch device. In particular to a mechanical device which is fixedly arranged on a door leaf or a door frame and is used for preventing the occurrence of door leaf hand clamping accidents.

Background

In daily life, hands are often pinched by door leaves. If the blood is slight, it will break the skin, and if the blood is severe, it will injure the bone, causing serious damage.

The products that are used for preventing door leaf tong on the market at present mainly have two kinds: one type is a door blocking clamp, a door blocking plug and other products made of sponge and other soft materials, and the products are various in types and different in shape in the market and can play a role in preventing the door leaf from clamping hands. However, these products are separate products from the door, and are required to be installed immediately when the door is opened, and the product must be taken down for additional placement when the door is closed, which is inconvenient to use. And the condition that the door is blocked or the door plug is blocked after the door is opened every time can not be guaranteed, so that the function of preventing hands from being clamped is lost. Meanwhile, when the door is closed, the product must be taken down for being placed additionally, and the door blocking clamp and the door blocking plug are easily lost. The other type is the anti-pinch door crack protection strip, the types of the products in the market are more, the basic principles are similar, the products are fixedly arranged on the side of the door shaft, but the hand crack accidents of the door crack on the side of the door shaft can be prevented, and the hand crack accidents on the side of the door lock with more frequent accidents can not be avoided.

Disclosure of Invention

The invention aims to overcome the defects of the existing anti-pinch product in installation and use, and provides a buffer type door leaf anti-pinch device which can reduce the accident that hands are pinched by a door leaf.

In order to solve the technical problems, the invention is realized by the following technical scheme:

The invention is composed of a buffer type air cylinder component 2-2 with a locking device and compression resistance which is automatically adjusted along with the compression speed, an air cylinder fixing seat 2-1, an auxiliary fixing seat 2-3 or an inclined plane stop block 2-5 and an auxiliary positioning seat 2-4.

The buffer type gas cylinder component 2-2 comprises a main piston top rod 38 which can move up and down, the upper part of the main piston top rod 38 is provided with a bearing 1 and a bearing shaft 2 for fixing the bearing, and the bearing 1 slightly protrudes out of the upper edge of the main piston top rod 38; the main air cylinder shell 12 is sleeved outside the main piston mandril 38, the lower piston of the main piston mandril 38 can move up and down along the inner wall of the main air cylinder shell 12, and the main piston mandril 38 extends out of the main air cylinder shell 12 through the upper opening 30 of the main air cylinder shell; the unidirectional piston sealing ring 28 with unidirectional ventilation is sleeved in the lower groove 11 of the main piston mandril 38 and is fixed with the lower part of the main piston mandril 38 in an elastic and airtight way, and the unidirectional piston sealing ring 28 moves up and down along with the main piston mandril 38 to form a unidirectional piston; the outer wall of the one-way piston sealing ring 28 is elastically contacted with the inner wall of the main air cylinder shell 12, so that the one-way air sealing effect is achieved; the return spring 27 is arranged in the main air cylinder shell 12, and two ends of the return spring 27 are respectively clamped between the bottom of the main piston mandril 38 and the elastic ventilation membrane 25; the elastic ventilation membrane 25 is clamped between the thread step 20 at the lower part of the main air cylinder shell 12 and the ventilation fixing seat 23; the main air cylinder shell 12 is in airtight connection with the ventilation fixing seat 23 through the thread matching of the main air cylinder sealing ring 22; the middle of the elastic ventilating membrane 25 is provided with a gas release hole 13, large ventilating holes 24 are uniformly distributed around the gas release hole 13, and the diameter of each large ventilating hole 24 is about 3 mm; the central position of the ventilation fixed seat 23 is provided with a ventilation adjusting nut 17, and the ventilation adjusting nut 17 is in thread fit and airtight connection with the ventilation fixed seat 23 through a ventilation adjusting sealing ring 16; a main ventilation gap 18 of 0.2 mm to 1.5 mm exists between the central area of the lower surface 19 of the elastic ventilation membrane and the upper end surface 14 of the ventilation adjusting nut 17, and the size of the main ventilation gap 18 can be adjusted by rotating the ventilation adjusting nut 17; the central position of the ventilation adjusting nut 17 is provided with a hexagonal ventilation through hole 15, and the ventilation adjusting nut 17 can be rotated by an inner hexagonal wrench, so that the size of the main ventilation gap 18 is adjusted; the large vent hole 24, the main vent gap 18 and the vent through hole 15 form a large vent channel; the supporting sleeve 7 is positioned in the middle of the interior of the main piston mandril 38 and is fixedly connected with the main piston mandril 38 through a sunk screw 9; a locking swing sheet rotating shaft 37 of the locking swing sheet 36 is fixed on the upper part of the supporting sleeve 7 through a through hole on the supporting sleeve 7; a fork rod pin 4 is fixed on the upper part of the swinging piece fork rod 5, the fork rod pin 4 is positioned in the swinging chute 3 of the locking swinging piece 36, and the locking swinging piece 36 can swing correspondingly by moving the swinging piece fork rod 5 up and down; a part of the locking swing piece 36 is positioned in the upper fork rod fork groove 35 of the swing piece fork rod 5 and can slide in the fork rod fork groove 35; the swing piece fork rod 5 is positioned in the positioning through hole 6 of the support sleeve 7 and can slide up and down along the positioning through hole 6; the lower part of the swinging piece fork rod 5 is provided with internal threads which are matched and connected with the external threads on the upper part of a secondary piston mandril 8 of a secondary piston 10, and the total length of the secondary piston mandril 8 and the swinging piece fork rod 5 can be adjusted through threads; the secondary piston sealing ring 29 is sleeved on the groove of the secondary piston 10, is fixed with the secondary piston 10 in an airtight way, and moves together with the secondary piston 10; the secondary piston sealing ring 29 is elastically contacted with the inner wall of the main piston mandril 38, so as to play a role of sealing air; the secondary return spring 31 is positioned inside the main piston mandril 38, and two ends of the secondary return spring 31 are respectively clamped between the bottom of the support sleeve 7 and the secondary piston 10; a sleeve bolt opening 34 is formed in the position, corresponding to the swing sheet bolt 33 for locking the swing sheet 36, on the support sleeve 7, and the swing sheet bolt 33 can extend out of the support sleeve 7 through the sleeve bolt opening 34; a main piston mandril bolt opening 32 is formed in the position, corresponding to the swing sheet bolt 33 for locking the swing sheet 36, of the main piston mandril 38, and the swing sheet bolt 33 can extend out of the main piston mandril through the main piston mandril bolt opening 32.

The air cylinder fixing seat 2-1 is sleeved at the bottom of the main air cylinder shell 12 of the buffer type air cylinder component 2-2 to prevent the buffer type air cylinder component 2-2 from moving downwards, and the bottom of the air cylinder fixing seat 2-1 is provided with a through hole for ventilation and a tool for conveniently using to rotate the ventilation adjusting nut 17. The buffer type gas cylinder assembly 2-2 can be rotated in the gas cylinder holder 2-1 in the axial direction of the buffer type gas cylinder assembly 2-2 to select the most suitable rolling direction of the bearing 1.

The auxiliary fixing seat 2-3 is sleeved on the upper part of the main air cylinder shell 12 of the buffer type air cylinder component 2-2 and is tightly matched with the main air cylinder shell 12 of the buffer type air cylinder component 2-2, and the auxiliary fixing seat plays a role in fixing and supporting the buffer type air cylinder component 2-2.

The auxiliary positioning seat 2-4 is sleeved outside a main piston mandril 38 of the buffer type air cylinder component 2-2 and is loosely matched with the main piston mandril 38 of the buffer type air cylinder component 2-2 to play a role in positioning the main piston mandril 38, the main piston mandril 38 can axially and freely slide up and down in a through hole of the auxiliary positioning seat 2-4, one side of the through hole of the auxiliary positioning seat 2-4 is provided with a abdicating groove 2-6, a bolt 33 extending out of the swinging piece can freely pass through the abdicating groove, and the auxiliary positioning seat 2-4 can not block the bolt 33 of the swinging piece.

The inclined plane stop block 2-5 is arranged right above the axial direction of the main piston mandril 38 of the buffer type air cylinder component 2-2.

When the invention is implemented, one or two of the auxiliary fixing seat 2-3, the auxiliary positioning seat 2-4 and the inclined plane stop block 2-5 can be selectively used according to actual use occasions, but not all the auxiliary fixing seat, the auxiliary positioning seat and the inclined plane stop block are used.

The sliding door has the advantages of simple structure, convenience in use and suitability for various opening and closing type sliding doors. The buffer type door leaf hand clamping prevention device has the great beneficial effect that the resistance of the buffer type door leaf hand clamping prevention device can be automatically adjusted according to the closing speed of the door leaf, so that the door leaf hand clamping accident is prevented. If the closing speed of the door leaf is low, even if hands are clamped, the hands cannot be injured, the resistance of the buffer type door leaf hand clamping prevention device is low, and the door can be easily closed; when the closing speed of the door leaf is high and a hand clamping accident is possibly caused, the buffer type door leaf hand clamping prevention device automatically increases the resistance of the closing of the door leaf, so that the closing speed of the door leaf is reduced when the door is closed; when the closing speed of the door leaf is very high, the buffer type door leaf hand clamping prevention device can directly block the closing of the door leaf, and the accident situation that the door leaf hand clamping occurs is effectively prevented.

Drawings

Fig. 1 is a schematic structural view of the present invention, which does not include an auxiliary positioning seat and a slope stopper, and the buffer type gas cylinder assembly is in a reset state.

fig. 2 is a schematic top view of the structure of fig. 1.

Fig. 3 is a bottom view of the structure of fig. 1.

Fig. 4 is a schematic view showing the construction of a venting portion of the buffer type gas cylinder assembly of the present invention, with an elastic venting membrane.

Fig. 5 is a schematic view showing the structure of a venting portion of the buffer type gas cylinder assembly of the present invention, which does not include an elastic venting membrane.

Fig. 6 is a schematic sectional view showing the structure of the buffer type cylinder assembly of the present invention in a locked state, in which the elastic vent membrane is in a close contact state with the upper end surface of the vent adjustment nut, the secondary piston is in a compressed state, and the swing piece latch is in a locked position, in which 10, the secondary piston, 17, the vent adjustment nut, 25, the elastic vent membrane, 33, the swing piece latch is shown.

Fig. 7 is a schematic cross-sectional view of the construction of the buffer type gas cylinder assembly of the present invention in a fully compressed state with the swing plate latch in the reset position, 33. the swing plate latch.

Fig. 8 is a schematic view showing the operation of the main piston ram of the buffer type gas cylinder assembly of the present invention at a low speed (1-3 cm/sec) in a downward movement, in which the swing plate latch is in a reset position. 33. Swing piece lock tongue, 38 main piston mandril.

Fig. 9 is a schematic view showing the working principle of the main piston ram of the buffer type gas cylinder assembly of the present invention when moving downward at a medium speed (3-5 cm/sec), in which the elastic vent membrane is deformed downward, the main vent gap is narrowed, but the elastic vent membrane is not closely attached to the upper end surface of the vent adjusting nut, and the vent capacity of the large vent channel is reduced but still kept open. In the figure, 14 is the upper end face of the ventilation adjusting nut, 17 is the ventilation adjusting nut, 18 is the main ventilation gap, 19 is the lower surface of the elastic ventilation membrane, 25 is the elastic ventilation membrane, and 1-2 is the large ventilation channel.

fig. 10 is a schematic view showing the operation principle of the main piston rod of the buffer type cylinder assembly of the present invention when moving downward at a high speed (5-50 cm/sec), in which the elastic vent membrane is in a close-fitting state with the upper end surface of the vent adjustment nut, the secondary piston is in a compressed state, and the large vent passage is closed. In the figure, 10 is a secondary piston, 17 is a ventilation adjusting nut, and 25 is an elastic ventilation diaphragm.

FIG. 11 is a table showing the relationship between the movement speed of the main piston rod and the resistance applied to the main piston rod of the buffer type inflator assembly according to the present invention, wherein when the movement speed of the main piston rod is greater than the threshold of the starting speed, the resistance applied to the main piston rod increases rapidly; when the speed of movement of the main piston ram decreases and the air pressure in the lower cavity 26 is less than the release pressure threshold, the resistance experienced by the main piston ram decreases rapidly.

Fig. 12 is a schematic structural view of the component assembly of the present invention, in which fig. 2-1, a cylinder holder, 2-2, a buffer type cylinder assembly, 2-3, an auxiliary holder, 2-4, an auxiliary positioning seat, 2-5, a slope stopper, and 2-6, a relief groove of the auxiliary positioning seat.

Fig. 13 is a schematic sectional view showing the structure of the assembly of the present invention, in which 2-1. a cylinder holder, 2-2. a buffer type cylinder assembly, 2-3. an auxiliary holder, 2-4. an auxiliary positioning seat, 2-5. a slope stopper, and 2-6. a relief groove of the auxiliary positioning seat.

Fig. 14 is a schematic structural diagram of an embodiment of the present invention.

Fig. 15 is a schematic diagram of the working state of the embodiment of fig. 14 in the startup state.

Fig. 16 is a schematic view of the embodiment of fig. 14 in a locked state.

Fig. 17 is a schematic structural diagram of another embodiment of the present invention.

FIG. 18 is an enlarged, partial, schematic view of the embodiment of the invention shown in FIG. 17.

Fig. 19 is a schematic view of the embodiment of the present invention shown in fig. 17 in an operating state in a locked state.

Fig. 20 is a schematic structural diagram of a third embodiment of the present invention.

FIG. 21 is an enlarged, fragmentary, schematic view of the embodiment of the invention shown in FIG. 17.

Detailed Description

The present invention is described in further detail below with reference to the attached drawing figures.

As shown in fig. 1 to 13, the present invention is composed of a buffer type gas cylinder assembly 2-2 with a locking device whose compression resistance is automatically adjusted according to the compression speed, and a gas cylinder holder 2-1 cooperating with an auxiliary holder 2-3 or a cooperating inclined stopper 2-5, and an auxiliary holder 2-4.

As shown in fig. 1, the buffer type gas cylinder assembly 2-2 comprises a main piston top rod 38 capable of moving up and down, a bearing 1 and a bearing shaft 2 for fixing the bearing are arranged on the upper part of the main piston top rod 38, and the bearing 1 slightly protrudes out of the upper edge of the main piston top rod 38; the main air cylinder shell 12 is sleeved outside the main piston mandril 38, the lower piston of the main piston mandril 38 can move up and down along the inner wall of the main air cylinder shell 12, and the main piston mandril 38 extends out of the main air cylinder shell 12 through the upper opening 30 of the main air cylinder shell; the unidirectional piston sealing ring 28 with unidirectional ventilation is sleeved in the lower groove 11 of the main piston mandril 38 and is fixed with the lower part of the main piston mandril 38 in an elastic and airtight way, and the unidirectional piston sealing ring 28 moves up and down along with the main piston mandril 38 to form a unidirectional piston; the outer wall of the one-way piston sealing ring 28 is elastically contacted with the inner wall of the main air cylinder shell 12, so that the one-way air sealing effect is achieved; the return spring 27 is arranged in the main air cylinder shell 12, and two ends of the return spring 27 are respectively clamped between the bottom of the main piston mandril 38 and the elastic ventilation membrane 25; the elastic ventilation membrane 25 is clamped between the thread step 20 at the lower part of the main air cylinder shell 12 and the ventilation fixing seat 23; the main air cylinder shell 12 is in airtight connection with the ventilation fixing seat 23 through the thread matching of the main air cylinder sealing ring 22; the middle of the elastic ventilating membrane 25 is provided with a gas release hole 13, large ventilating holes 24 are uniformly distributed around the gas release hole 13, and the diameter of each large ventilating hole 24 is about 3 mm; the central position of the ventilation fixed seat 23 is provided with a ventilation adjusting nut 17, and the ventilation adjusting nut 17 is in thread fit and airtight connection with the ventilation fixed seat 23 through a ventilation adjusting sealing ring 16; a main ventilation gap 18 of 0.2 mm to 1.5 mm exists between the central area of the lower surface 19 of the elastic ventilation membrane and the upper end surface 14 of the ventilation adjusting nut 17, and the size of the main ventilation gap 18 can be adjusted by rotating the ventilation adjusting nut 17; the central position of the ventilation adjusting nut 17 is provided with a hexagonal ventilation through hole 15, and the ventilation adjusting nut 17 can be rotated by an inner hexagonal wrench, so that the size of the main ventilation gap 18 is adjusted; the large vent hole 24, the main vent gap 18 and the vent through hole 15 form a large vent channel; the supporting sleeve 7 is positioned in the middle of the interior of the main piston mandril 38 and is fixedly connected with the main piston mandril 38 through a sunk screw 9; a locking swing sheet rotating shaft 37 of the locking swing sheet 36 is fixed on the upper part of the supporting sleeve 7 through a through hole on the supporting sleeve 7; a fork rod pin 4 is fixed on the upper part of the swinging piece fork rod 5, the fork rod pin 4 is positioned in the swinging chute 3 of the locking swinging piece 36, and the locking swinging piece 36 can swing correspondingly by moving the swinging piece fork rod 5 up and down; a part of the locking swing piece 36 is positioned in the upper fork rod fork groove 35 of the swing piece fork rod 5 and can slide in the fork rod fork groove 35; the swing piece fork rod 5 is positioned in the positioning through hole 6 of the support sleeve 7 and can slide up and down along the positioning through hole 6; the lower part of the swinging piece fork rod 5 is provided with internal threads which are matched and connected with the external threads on the upper part of a secondary piston mandril 8 of a secondary piston 10, and the total length of the secondary piston mandril 8 and the swinging piece fork rod 5 can be adjusted through threads; the secondary piston sealing ring 29 is sleeved on the groove of the secondary piston 10, is fixed with the secondary piston 10 in an airtight way, and moves together with the secondary piston 10; the secondary piston sealing ring 29 is elastically contacted with the inner wall of the main piston mandril 38, so as to play a role of sealing air; the secondary return spring 31 is positioned inside the main piston mandril 38, and two ends of the secondary return spring 31 are respectively clamped between the bottom of the support sleeve 7 and the secondary piston 10; a sleeve bolt opening 34 is formed in the position, corresponding to the swing sheet bolt 33 for locking the swing sheet 36, on the support sleeve 7, and the swing sheet bolt 33 can extend out of the support sleeve 7 through the sleeve bolt opening 34; a main piston mandril bolt opening 32 is formed in the position, corresponding to the swing sheet bolt 33 for locking the swing sheet 36, of the main piston mandril 38, and the swing sheet bolt 33 can extend out of the main piston mandril through the main piston mandril bolt opening 32.

The air cylinder fixing seat 2-1 is sleeved on the bottom of the main air cylinder shell 12 of the buffer type air cylinder assembly 2-2 to prevent the buffer type air cylinder assembly 2-2 from moving downwards, and the bottom of the air cylinder fixing seat 2-1 is provided with a through hole for ventilation and a ventilation adjusting nut 17 convenient to use by rotating a tool. The buffer type gas cylinder assembly 2-2 can be rotated in the gas cylinder holder 2-1 in the axial direction of the buffer type gas cylinder assembly 2-2 to select the most suitable rolling direction of the bearing 1.

In the absence of external force, if the buffer type air cylinder assembly 2-2 is in a compressed state, the main piston post rod 38 and the support sleeve 7 move upward together under the action of the return spring 27, the one-way piston seal ring 28 is in a one-way ventilation state, a part of air accumulated in the inner cavity of the main air cylinder shell 12 at the upper part of the one-way piston seal ring 28 is discharged out of the main air cylinder shell 12 through the gap between the main piston post rod 38 and the upper opening 30 of the main air cylinder shell 12, and a part of air enters the lower cavity 26 at the lower part of the one-way piston seal ring 28 through the opened one-way piston seal ring 28; air from outside the main cartridge housing 12 passes through the hexagonal ventilation holes 15 in the middle of the ventilation adjusting nut 17, through the large ventilation holes 24 of the elastic ventilation membrane 25 and the air release holes 13 into the lower cavity 26 inside the main cartridge housing 12. At this time, the air flow channel is smooth, the air compression resistance can be ignored, the main piston top rod 38 finally extends out of the main air cylinder shell 12 to the maximum extent under the action of the return spring 27, and the return is completed; meanwhile, as no air pressure exists in the lower cavity 26, the secondary return spring 31 is reset, and the swinging piece bolt 33 retracts into the main piston mandril. The state after reset is shown in fig. 1.

After the reset is completed, under the condition that external force acts on the bearing 1 of the main piston mandril 38, the downward external force component along the axial direction of the main piston mandril 38 drives the main piston mandril 38 to move downward, and the one-way piston sealing ring 28 enters a sealing state. According to the difference of the movement speed, the description is divided into three cases:

1. As shown in FIG. 8, the main piston ram 38 moves downward, but at a slower rate, such as 1-3 cm/sec. The air in the lower cavity 26 inside the main cartridge housing 12 is compressed and moves in the direction of arrows 1-3. The majority of the forced air exits the outside of the barrel through the large vent channels formed by the large vent holes 24 and the main vent gaps 18 as shown by arrows 1-2, and the minority of the forced air exits the outside of the barrel through the bleed channels formed by the bleed holes 13 as shown by arrows 1-1. At this time, the air discharge passage is very smooth, the air pressure in the lower cavity 26 is small, the air resistance of the main piston mandril 38 when moving downwards is small, and the air resistance is only subjected to the rebound force of the return spring 27, so that the air can easily move downwards; at the same time, because the air pressure inside the lower cavity 26 is low, the swing plate locking tongue 33 remains inside the main piston ram 38. Eventually, under the influence of an external force, the main piston ram 38 can move downward until the buffer type cylinder assembly is in a fully compressed state, as shown in fig. 7.

2. As shown in FIG. 9, the main piston ram 38 moves downward, but at a faster rate, such as 3-5 cm/sec. The air in the lower cavity 26 inside the main cartridge housing 12 is squeezed relatively quickly and moves in the direction of arrows 1-3. The air being squeezed relatively quickly pushes the flexible vent membrane 25 to deform it slightly downward, narrowing the main vent gap 18 between the central area of the lower surface 19 of the flexible vent membrane 25 and the upper end surface 14 of the vent adjustment nut 17, reducing the venting capacity of the large vent channel formed by the large vent hole 24 and the main vent gap 18 as shown by arrows 1-2 but remaining open, the air pressure in the lower cavity 26 begins to increase, and the resistance to downward movement of the main piston ram 38 also increases slightly; while the wobble plate tab 33 remains inside the primary piston ram 38 because the air pressure inside the lower cavity 26, although increased, is still insufficient to push the secondary piston 10 enough to produce enough motion. Eventually, under the influence of an external force, the main piston ram 38 can move downward until the buffer type cylinder assembly is in a fully compressed state, as shown in fig. 7.

3. As shown in fig. 6 and 10, the main piston ram 38 moves downward, but initially at a relatively high speed, such as 5-50 cm/sec. The air in the lower cavity 26 inside the main cylinder case 12 is strongly compressed and pushes the elastic vent membrane 25 in the direction of the arrows 1-3 to deform it larger downward, so that the main vent gap 18 between the central area of the lower surface 19 of the elastic vent membrane 25 and the upper end surface 14 of the vent adjustment nut 17 becomes narrower, the air discharge capacity of the large vent passage formed by the large vent hole 24 and the main vent gap 18 is further reduced, and the air flow speed through the main vent gap 18 is increased. If the rate of air compression in the lower cavity 26 inside the main cylinder housing 12 continues to be greater than the rate of air discharge, the central area of the lower surface 19 of the flexible vent membrane 25 engages the upper end surface 14 of the vent adjustment nut 17 and the large vent passage 18 is completely closed under the dual action of the downward pressure of the compressed air in the lower cavity 26 and the negative pressure created by the rapidly flowing air stream flowing through the main vent gap 18. Once the large vent passage is closed, the air displacement is suddenly reduced, and under the condition that the compression speed of the air in the lower cavity 26 is kept unchanged, the air pressure in the lower cavity 26 is increased by times, so that the central area of the lower surface 19 of the elastic vent membrane 25 is completely attached to the upper end surface 14 of the vent adjusting nut 17, and the sealing of the large vent passage is more consolidated. As shown in fig. 10, the main vent gap 18 is completely closed. Once the main air gap 18 is completely closed, the compressed air can only be slowly exhausted out of the air cylinder through the air escape channel 1-1 formed by the air escape hole 13, the air pressure of the air escape channel is suddenly reduced, the air pressure of the lower cavity 26 is rapidly increased, the resistance of the downward movement of the main piston rod 38 is rapidly increased, and the downward movement speed of the main piston rod 38 is continuously reduced. Meanwhile, as the air pressure of the lower cavity 26 is rapidly increased, the air pressure pushes the secondary piston 10 to move upwards in the direction of an arrow 1-4, so that the swing piece fork rod 5 is pushed to move upwards, the fork rod pin 4 at the upper part of the swing piece fork rod 5 enables the locking swing piece 36 to swing towards the direction of the main piston mandril bolt opening 32 through the swing chute 3 of the locking swing piece 36, and finally the swing piece bolt 33 of the locking swing piece 36 extends out of the main piston mandril bolt opening 32. With the swing plate latch 33 extending out of the main piston ram latch opening 32, if the main piston ram 38 continues to move downward, the extending swing plate latch 33 will collide with the upper end face of the main cylinder case 12, preventing the main piston ram 38 from continuing to move downward, as shown in the state of fig. 6. After the main piston rod 38 stops moving, the air pressure of the lower cavity 26 does not increase any more, the air of the lower cavity 26 slowly leaks air through the air leakage hole 13, finally the compressed air of the lower cavity 26 is slowly discharged, the air pressure of the lower cavity 26 gradually decreases, the secondary piston 10 completes resetting under the action of the secondary reset spring 31, the secondary piston rod 8 drives the swing piece fork rod 5, the swing piece fork rod 5 drives the locking swing piece 36, so that the swing piece lock tongue 33 retracts into the main piston rod lock tongue opening 32, at this time, the main piston rod 38 can continue moving downwards until the buffer type air cylinder assembly is in a completely compressed state, as shown in fig. 7.

The elastic vent membrane 25 may be made of a silicone material or a rubber material having a thickness of 0.3-2 mm.

The aperture size of the air release hole 13 is inversely related to the resistance of the main piston top rod 38 to move downwards after the large air passage is closed, the smaller the aperture of the air release hole 13 is, the slower the air release is, and the larger the resistance of the main piston top rod 38 to move downwards is. The diameter of the air release hole 13 is generally between 0.05 mm and 0.5 mm according to the design requirement.

As shown in fig. 11, the process of the main ventilation gap 18 being completely closed is a positive feedback process. The rate at which the main piston ram 38 moves downwardly when the main vent gap 18 is initially fully closed is referred to as the start-up rate threshold for the buffer type cylinder assembly 2-2; the pressure at which the air pressure in the lower cavity 26 is released to just below the force of the resilient vent membrane 25 at which the main vent gap 18 is just opened after the closure is complete is referred to as the release pressure threshold. The main vent gap 18 is quickly and completely closed once the downward speed of the main piston ram 38 exceeds the start-up speed threshold. Once closure is complete, the air pressure in the lower cavity 26 increases rapidly, several times the air pressure before the main vent gap 18 is completely closed, thereby further enhancing closure of the main vent gap 18, and simultaneously increasing the resistance to downward movement of the main piston ram 38. After the closure is completed, the large vent path is reopened only if the air pressure in the lower cavity 26 is less than the release pressure threshold. Once the large vent passage is opened, the air pressure in the lower cavity 26 is quickly released, the large vent passage is immediately fully opened, and the resistance to downward movement of the main piston ram 38 is quickly reduced.

The rotary vent adjustment nut 17 may be used to adjust the size of the central area of the lower surface 19 of the flexible vent membrane 25 and the main vent gap 18 of the upper end surface 14 of the vent adjustment nut 17 to adjust the amount of downward movement of the main piston ram 38 at the beginning of the main vent gap 18 being completely closed, i.e., the threshold actuation rate of the buffer type air cylinder assembly 2-2. The main ventilation gap 18 is large, the starting speed threshold is also large, and the main ventilation gap 18 can be completely closed only when the downward movement speed of the main piston mandril 38 is correspondingly large; the small main vent gap 18 results in a small threshold for the start-up speed, and the main vent gap 18 is completely closed when the downward speed of the main piston ram 38 is correspondingly low. After the downward movement speed of the main piston ram 38 exceeds the threshold of the starting speed of the buffer type gas cylinder assembly 2-2, the main ventilation gap 18 is completely closed, and the resistance to the downward movement of the main piston ram 38 of the buffer type gas cylinder assembly 2-2 is suddenly increased, thereby forcing the movement speed of the main piston ram 38 to be reduced.

The return spring 27 is a light-weight spring with a small elastic coefficient, and only needs to overcome the friction force of the elastic contact between the outer wall of the one-way piston seal ring 28 and the inner wall of the main cylinder housing 12 during the return, and the elastic force is enough to complete the return. During compression, the force of the return spring 27 is negligible compared to the air pressure experienced by the main piston ram 38 after the main vent gap 18 is fully closed.

The secondary return spring 31 has a large spring constant, and is not compressed by the air pressure before the main air gap 18 is completely closed, and the secondary return spring 31 is compressed only by the air pressure after the main air gap 18 is completely closed, so that the secondary piston 10 moves.

In summary, when the buffer type door leaf anti-pinch device is not under the action of external force, the main piston rod 38 automatically extends out under the action of the return spring to complete the return. When the door is closed, when the main piston top rod 38 is moved downward by the external force, if the moving speed is low, the resistance force applied during the movement is low, and the main piston top rod 38 can be moved downward without any difficulty, so that the door can be closed easily. If the moving speed is higher and exceeds the preset starting speed threshold value, the resistance force applied during the movement is suddenly increased, and meanwhile, the swing sheet lock tongue 33 of the swing sheet 36 extends out of the main piston mandril lock tongue opening 32. The greater resistance forces the speed of movement of the master piston ram 38 to decrease to a lower level. When the movement speed of the main piston mandril 38 is reduced and the air pressure of the lower cavity 26 is smaller than the pressure releasing threshold, the main ventilation gap 18 is opened, the air pressure of the lower cavity 26 is suddenly reduced, the movement resistance of the main piston mandril 38 is reduced, and meanwhile, the swinging piece lock tongue 33 of the swinging piece 36 retracts into the main piston mandril 38, so that the door leaf can be smoothly closed; if the door leaves are closed at a very high speed, and the resistance of the main piston ram 38 still does not reduce the closing speed of the door leaves to a safe speed (e.g., less than 2 cm/sec), the air in the lower cavity 26 will continue to maintain a high pressure, and the latch 33 extending out of the latch opening 32 of the main piston ram will prevent the main piston ram 38 from continuing to move, as shown in the state of fig. 6, thereby directly blocking the closing of the door leaves. After the door leaf is blocked by the main piston mandril bolt 33 to stop moving, the air pressure of the lower cavity 26 begins to reduce until the bolt 33 retracts into the main piston mandril bolt opening 32, and the door leaf can be closed smoothly.

As shown in fig. 12 and 13, the auxiliary fixing seat 2-3 is fitted over the upper portion of the main cylinder housing 12 of the buffer type air cylinder assembly 2-2 and is tightly fitted with the main cylinder housing 12 of the buffer type air cylinder assembly 2-2, thereby serving to fix and support the buffer type air cylinder assembly 2-2. The auxiliary positioning seat 2-4 is sleeved outside the main piston mandril 38 of the buffer type air cylinder component 2-2 and is loosely matched with the main piston mandril 38 of the buffer type air cylinder component 2-2 to play a role in positioning the main piston mandril 38, the main piston mandril 38 can axially and freely slide up and down in a through hole of the auxiliary positioning seat 2-4, one side of the through hole of the auxiliary positioning seat 2-4 is provided with a relief groove 2-6 which can allow the bolt 33 extending out of the swinging piece to freely pass through, and the auxiliary positioning seat 2-4 can not block the bolt 33 of the swinging piece. The inclined plane stopper 2-5 is installed right above the axial direction of the main piston top rod 38 of the buffer type air cylinder component 2-2. When the invention is implemented, one or two of the auxiliary fixing seat 2-3, the auxiliary positioning seat 2-4 and the inclined plane stop block 2-5 can be selectively used according to actual use occasions, but not all the auxiliary fixing seat, the auxiliary positioning seat and the inclined plane stop block are used.

Embodiment 1 of an embodiment of the present invention for an opening and closing door leaf:

As shown in fig. 14 and 16, the buffer type door anti-pinch device is installed at the lower side of the upper door frame 3-4, and the buffer type cylinder assembly 2-2 is fixedly installed at the upper door frame 3-4 through the cylinder holder 2-1 and the auxiliary holder 2-3 such that the bearing shaft 2 of the bearing 1 is perpendicular to the lower surface of the upper door frame 3-4. When the door leaf 3-3 is closed to leave a certain gap 3-5, the door leaf 3-3 comes into contact with the bearing 1 of the main piston rod 38 of the buffer type gas cylinder assembly 2-2 and performs a compression motion on the buffer type gas cylinder assembly 2-2.

If the kinetic energy is small and the speed is low when the door leaf 3-3 is closed, the moving speed of the main piston top rod 38 is also low and is lower than the starting speed threshold of the buffer type air cylinder 2-2, the buffer type door leaf hand-clamping prevention device keeps small resistance, so that the door leaf can be easily closed.

If the kinetic energy is larger and the speed is faster when the door 3-3 is closed, the moving speed of the main piston rod 38 is also faster, once the moving speed is larger than the starting speed threshold of the buffer type air cylinder component 2-2, the resistance of the buffer type door anti-pinch device is suddenly increased, and the swing piece lock tongue 33 of the swing piece 36 extends out of the main piston rod lock tongue opening 32. The suddenly increasing resistance forces the speed of movement of the main piston ram 38 to decrease, which also decreases the closing speed of the door leaf 3-3. If the moving speed of the main piston post rod 38 is reduced to a lower level (less than 2 cm/s) and the air pressure of the lower cavity 26 is lower than the release pressure threshold, the main ventilation gap 18 is opened, the air pressure of the lower cavity 26 is suddenly reduced, the moving resistance of the main piston post rod 38 is reduced, and meanwhile, the swinging sheet lock tongue 33 of the swinging sheet 36 retracts into the main piston post rod 38 due to the reduction of the air pressure of the lower cavity 26, at the moment, the closing speed of the door leaf is reduced to a safer speed, the door leaf can be closed smoothly, and even if the door leaf is clamped, the hand clamping accident cannot be caused. If the kinetic energy is large and the speed is too fast when the door leaf 3-3 is closed, the resistance of the buffer type air cylinder assembly 2-2 still can not reduce the moving speed of the main piston mandril 38 to a lower level (less than 2 cm/s) and the closing speed of the door leaf is also large, the bolt 33 extending out of the bolt opening 32 of the main piston mandril can prevent the main piston mandril 38 from continuously moving, so that the door leaf is prevented from continuously closing, a sufficient safety gap 3-10 is ensured to be left between the door leaf 3-3 and the door frame, and the occurrence of door leaf hand clamping accidents is prevented.

When the door leaf is opened, the door leaf is not blocked, and the main piston mandril 38 of the buffer type door leaf hand-clamping prevention device automatically resets and extends out under the action of the return spring 27 to prepare for the next starting.

The size of the starting gap 3-5 of the buffer type door leaf anti-pinch device during starting can be adjusted by adjusting the left and right positions of the buffer type door leaf anti-pinch device during installation of the upper door frame 3-4, if the installation position is moved in the direction of an arrow 3-1, the starting gap 3-5 and the safety gap 3-10 of the buffer type door leaf anti-pinch device are correspondingly enlarged, and if the installation position is moved in the direction of an arrow 3-2, the starting gap 3-5 and the safety gap 3-10 of the buffer type door leaf anti-pinch device are correspondingly reduced.

Another embodiment of the invention for an opening and closing door leaf

As shown in fig. 17 and 19, the buffer type door leaf anti-pinch device is installed on the upper edge of the door leaf 3-3, and the buffer type gas cylinder assembly 2-2 is fixedly installed on the door leaf 3-3 through the gas cylinder fixing seat 2-1 and the auxiliary positioning seat 2-4. When in installation, the bearing shaft 2 of the bearing 1 is parallel to the upper edge of the door leaf 3-3; the primary piston ram bolt opening 32 is oriented in the direction of the relief groove 2-6 of the secondary positioning seat 2-4 to prevent the secondary positioning seat 2-4 from blocking the wobble plate bolt 33 when the wobble plate bolt 33 is extended. The inclined surface stopper 2-5 is installed on the door frame 3-4 corresponding to the axial position of the main piston rod 38 of the buffer type cylinder assembly 2-2. When the door leaf 3-3 is closed to leave a certain gap 3-5, the inclined plane stop block 2-5 is contacted with the bearing 1 of the main piston mandril 38 of the buffer type door leaf anti-pinch device. The buffer type cylinder assembly 2-2 performs a compression motion due to the slope action of the slope stopper 2-5.

if the kinetic energy is small and the speed is low when the door leaf 3-3 is closed, the moving speed of the main piston top rod 38 is also low and is lower than the starting speed threshold of the buffer type air cylinder 2-2, the buffer type door leaf hand-clamping prevention device keeps small resistance, so that the door leaf can be easily closed.

If the kinetic energy is larger and the speed is faster when the door 3-3 is closed, the moving speed of the main piston rod 38 is also faster, once the moving speed is larger than the starting speed threshold of the buffer type air cylinder component 2-2, the resistance of the buffer type door anti-pinch device is suddenly increased, and the swing piece lock tongue 33 of the swing piece 36 extends out of the main piston rod lock tongue opening 32. The suddenly increasing resistance forces the speed of movement of the main piston ram 38 to decrease, which also decreases the closing speed of the door leaf 3-3. If the moving speed of the main piston post rod 38 is reduced to a lower level (less than 2 cm/s) and the air pressure of the lower cavity 26 is lower than the release pressure threshold, the main ventilation gap 18 is opened, the air pressure of the lower cavity 26 is suddenly reduced, the moving resistance of the main piston post rod 38 is reduced, and meanwhile, the swinging sheet lock tongue 33 of the swinging sheet 36 retracts into the main piston post rod 38 due to the reduction of the air pressure of the lower cavity 26, at the moment, the closing speed of the door leaf is reduced to a safer speed, the door leaf can be closed smoothly, and even if the door leaf is clamped, the hand clamping accident cannot be caused. If the kinetic energy is large and the speed is too fast when the door leaf 3-3 is closed, the resistance of the buffer type air cylinder assembly 2-2 still can not reduce the moving speed of the main piston mandril 38 to a lower level (less than 2 cm/s) and the closing speed of the door leaf is also large, the bolt 33 extending out of the bolt opening 32 of the main piston mandril can prevent the main piston mandril 38 from continuously moving, so that the door leaf is prevented from continuously closing, a sufficient safety gap 3-10 is ensured to be left between the door leaf 3-3 and the door frame, and the occurrence of door leaf hand clamping accidents is prevented.

when the door leaf is opened, the main piston mandril 38 of the buffer type door leaf anti-pinch device automatically resets and extends out under the action of the return spring 27 without the blocking of the inclined plane stop dog 2-5, and the buffer type door leaf anti-pinch device is ready for the next starting.

The starting gap 3-5 size of the buffer type door leaf anti-pinch device during starting can be adjusted by adjusting the left and right positions of the buffer type door leaf anti-pinch device during installation of the door leaf 3-3, if the installation position is moved in the direction of an arrow 3-1, the starting gap 3-5 and the safety gap 3-10 of the buffer type door leaf anti-pinch device are correspondingly enlarged, and if the installation position is moved in the direction of an arrow 3-2, the starting gap 3-5 and the safety gap 3-10 of the buffer type door leaf anti-pinch device are correspondingly reduced.

Detailed description of an embodiment of the invention for a sliding door leaf

As shown in fig. 20 and 21, the door leaves 3-6 and 3-7 are mounted on the sliding rails 3-8 of the upper frame 3-9 of the sliding door. The buffer type door leaf hand-clamping prevention device is arranged on one side of the upper edge of the door leaf 3-7, and the buffer type air cylinder translation component 2-2 is fixedly arranged on the door leaf 3-7 through the air cylinder fixing seat 2-1 and the auxiliary fixing seat 2-3. When the sliding door is closed, the door leaf 3-6 is separated from the door leaf 3-7 by a certain starting gap 3-13, and the side surface of the door leaf 3-6 is contacted with the bearing 1 of the main piston mandril 38 of the buffer type door leaf anti-pinch device. The buffer type gas cylinder assembly 2-2 is subjected to a compressing motion.

If the kinetic energy of the door leaves 3-6 and the door leaves 3-7 is small when the door leaves are closed, and the speed is low, the moving speed of the main piston mandril 38 is low and is lower than the starting speed threshold of the buffer type air cylinder 2-2, the buffer type door leaf hand-clamping prevention device keeps small resistance, so that the door leaves can be closed easily.

If the kinetic energy of the door leaves 3-6 and the door leaves 3-7 is larger and the speed is faster when the door leaves are closed, the moving speed of the main piston mandril 38 is also faster, once the moving speed is larger than the starting speed threshold of the buffer type air cylinder component 2-2, the resistance of the buffer type door leaf anti-pinch device is suddenly increased, and simultaneously, the swing sheet lock tongue 33 of the swing sheet 36 extends out of the lock tongue opening 32 of the main piston mandril. The suddenly increasing resistance forces the speed of movement of the main piston ram 38 to decrease and at the same time the speed of closing of the door leaves 3-6 and 3-7 to decrease. If the moving speed of the main piston post rod 38 is reduced to a lower level (less than 2 cm/s) and the air pressure of the lower cavity 26 is lower than the release pressure threshold, the main ventilation gap 18 is opened, the air pressure of the lower cavity 26 is suddenly reduced, the moving resistance of the main piston post rod 38 is reduced, and meanwhile, the swinging sheet lock tongue 33 of the swinging sheet 36 retracts into the main piston post rod 38 due to the reduction of the air pressure of the lower cavity 26, at the moment, the closing speed of the door leaf is reduced to a safer speed, the door leaf can be closed smoothly, and even if the door leaf is clamped, the hand clamping accident cannot be caused. If the kinetic energy of the folding of the door leaves 3-6 and the door leaves 3-7 is large and the speed is too high, the resistance of the buffer type air cylinder assembly 2-2 still can not reduce the movement speed of the main piston mandril 38 to a lower level (less than 2 cm/s) and the folding speed of the door leaves 3-6 and the door leaves 3-7 is large, the lock tongue 33 extending out of the lock tongue opening 32 of the main piston mandril can prevent the main piston mandril 38 from continuously moving, so that the door leaves 3-6 and the door leaves 3-7 are prevented from continuously folding, a sufficient gap is ensured to be left between the door leaves 3-6 and the door leaves 3-7, and the occurrence of door leaf hand clamping accidents is prevented.

When the door leaf is opened, the blocking of the door leaves 3-6 is avoided, and the main piston mandril 38 of the buffer type door leaf hand-clamping prevention device automatically resets and extends out under the action of the return spring 27 to prepare for the next starting.