Telescopic ladder with buffer structure and using method thereof

Abstract

The present invention relates to the technical field of telescopic ladders, and particularly to a telescopic ladder with a buffer structure and a method for using the same, comprising a plurality of ladder units, wherein the ladder units comprise two ladder rods, and two adjacent ladder units are slidably sleeved together via the ladder rods, a connecting portion is installed on the upper portions of the two ladder rods, a step is rotatably installed between the two connecting portions, a receiving groove is provided on the lower surface of the step, a buffer air bag is installed in the receiving groove, a through groove is provided on both sides of the step, a first magnetic block is fixedly installed on the upper portion of the through groove, a second magnetic block is installed on the lower portion of the through groove, an inflation assembly is installed between the receiving groove and the through groove, and a buffer assembly is installed between the two ladder rods slidably sleeved together, the present invention provides a first magnetic block and a second magnetic block, and inflates the buffer air bag under the drive of magnetic force, so that there is enough gas in the buffer air bag to inflate, thereby forming protection for the lower surface of the upper step, thereby reducing the possibility of users pinching their fingers when placing their hands on the steps.

Description

Technical Field

[0001] The present invention relates to the technical field of telescopic ladders, and in particular to a telescopic ladder with a buffer structure and a use method thereof. Background Art

[0002] A telescopic ladder is a type of ladder used for climbing work that can be extended and stretched when in use and folded and shortened for storage when not in use. Currently, existing telescopic ladders are push-button telescopic ladders. Pushing the button unlocks the ladder, and the ladder descends and folds under its own weight. Because the ladder encounters minimal resistance during descent, each ladder unit descends and folds rapidly. If a user's hands are improperly positioned, with fingers positioned between the two crossbars, the rungs of the ladder can easily cause injuries or damage to the user's fingers. The rapid descent of the ladder can also lead to finger pinching. Application No. "CN201680003667.4" discloses a telescopic ladder with a cushioning function. The ladder comprises a plurality of ladder units and employs a telescopic airbag as a cushioning device. The cushioning device is disposed between adjacent ladder units. As each ladder unit descends and folds, the cushioning device abuts between the adjacent ladder units. The cushioning device is subject to the forces acting between the ladder units, causing it to slowly contract in its length. However, the gas within the airbag is compressible. If the ladder units are heavy and descend rapidly, the airbags can compress, potentially causing finger pinching. Summary of the Invention

[0003] In view of this, an object of the present invention is to provide a telescopic ladder with a buffer structure and a method of using the same, so as to solve the problem of pinching fingers when using a telescopic airbag as a buffer device.

[0004] The two ladder units according to claim 1, wherein the two ladder units are connected to each other through the ladder units, and the upper parts of the two ladder units are provided with a connecting portion, and a ladder step is rotatably installed between the two connecting portions. The lower surfaces of the ladder steps are provided with a receiving groove along the length direction of the ladder step, and a buffer air bag is installed in the receiving groove. Both sides of the ladder step are provided with a through groove along the width direction of the ladder step. The upper part of the through groove is fixedly installed with a first magnetic block, and the lower part of the through groove is movably installed with a second magnetic block. The upper part of the first magnetic block and the lower part of the second magnetic block have the same magnetic properties. An inflatable air bag is installed between the first magnetic block and the second magnetic block, and the inflatable air bag is connected to the buffer air bag. An inflation component for inflating the buffer air bag is installed between the accommodating groove and the through groove, and the inflatable air bag is transmission-connected to the second magnetic block. A buffer component is installed between the two ladder rods that are slidably sleeved with each other, and a fixing portion for fixing the position of the ladder rod is also installed on the connecting portion.

[0005] Optionally, the inflation component includes a blower wheel, an intermediate groove is provided between the accommodating groove and the through groove, the blower wheel is rotatably installed in the intermediate groove, the blower wheel includes a wheel disc, a rotating shaft is installed in the middle of one side of the wheel disc, the rotating shaft extends into the through groove and is installed with a gear, a rack is installed on the upper surface of the second magnetic block, the gear is engaged with the rack, blades are provided on the other side of the wheel disc, an air collecting hood is rotatably installed on the wheel disc, and the air collecting hood is communicated with the buffer airbag.

[0006] Optionally, the connecting part includes a fixing ring, which is mounted on the upper end of the ladder rod through the fixing ring, a rotating sleeve is installed on one side of the fixing ring, one end of the step is rotatably installed in the rotating sleeve, a torsion spring is installed between the rotating sleeve and the step, and a snap-fitting groove is provided on the other side of the fixing ring, and the clamping part enters the fixing ring through the clamping groove to clamp the ladder rod.

[0007] Optionally, the fixing part includes a plate, a spring is installed between the plate and the fixing ring, a rotating hole is opened in the middle of the plate, an operating handle is rotatably installed in the rotating hole, a bayonet is rotatably installed at one end of the operating handle, the bayonet is slidably installed in the locking groove, and a fixing groove matching the bayonet is opened at the lower end of the ladder rod.

[0008] Optionally, a limiting portion for fixing the distance between the fixing plate and the fixing ring is further installed between the clamping portion and the fixing ring, a boss is provided on one side of the fixing ring, a through hole connected to the locking groove is provided on the boss, and the operating handle is rotatably installed in the through hole, a first locking groove and a second locking groove are provided on the boss, the first locking groove and the second locking groove are arranged perpendicular to each other, and the depth of the second locking groove is smaller than the depth of the first locking groove, and a protrusion is provided on the side of the operating handle facing the fixing ring, and the protrusion matches the first locking groove and the second locking groove.

[0009] Optionally, an external support rod is further installed on the outer side of the ladder rod, and the external support rods on adjacent ladder rods are slidably connected to each other, and a plurality of ventilation holes are opened on the surface of the external support rod along the length direction thereof.

[0010] Optionally, a protective rubber strip is installed between two adjacent connecting parts.

[0011] Optionally, the buffer assembly includes a drum-shaped airbag, a support ring is installed in the middle of the drum-shaped airbag, a connecting shaft is installed in the middle of the support ring, the connecting shaft extends from the upper part out of the drum-shaped airbag and is connected to the bottom of the ladder rod, a plurality of sliding grooves are evenly distributed on the annular surface of the support ring, an anti-sliding block is slidably installed in the sliding groove, an elastic member is installed between the anti-sliding block and the support ring, and an air outlet is opened at the lower part of the drum-shaped airbag.

[0012] Optionally, the drum-shaped airbag is made of rubber.

[0013] Based on the above embodiment, a method for using a telescopic ladder with a buffer structure is proposed, comprising the following steps:

[0014] Pulling apart the multiple ladder units in sequence, the ladder units are locked together by the clamping parts, so that the pulled-out ladder rods are fixed in position with the adjacent ladder rods;

[0015] When the telescopic ladder needs to be folded, the lock of the clamping part on the ladder rod is released, and the ladder rod at the upper part slides downward under the action of its own weight. When the upper step approaches the lower step, because the upper part of the first magnetic block and the lower part of the second magnetic block have the same magnetism, under the action of magnetism, the second magnetic block located on the upper step slides into the through groove, and the second magnetic block squeezes the inflatable airbag in the through groove, and the gas in the inflatable airbag enters the buffer airbag. At the same time, the second magnetic block drives the inflatable component to work, and the inflatable component blows air into the buffer airbag, causing the buffer airbag to swell, forming protection for the lower surface of the upper step. When the upper ladder rod is about to drop to the bottom, the buffer assembly slows down the descending speed of the ladder rod.

[0016] Beneficial effects of the present invention: The telescopic ladder with a buffer structure proposed in the present invention is provided with a first magnetic block and a second magnetic block, and the buffer air bag is inflated under the drive of magnetic force, so that there is enough gas in the buffer air bag to inflate, forming protection for the lower surface of the upper step, reducing the possibility of users pinching their fingers when placing their hands on the steps. The provision of the protective rubber strip reduces the possibility of people's hands being squeezed by the falling ladder bars when people place their hands on the ladder bars. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 Schematic diagram of a telescopic ladder with a buffer structure according to an embodiment of the present invention Figure 1 ;

[0019] Figure 2 Schematic diagram of a telescopic ladder with a buffer structure according to an embodiment of the present invention Figure 2 ;

[0020] Figure 3 for Figure 2 A magnified schematic diagram of point A in the middle;

[0021] Figure 4 A schematic diagram of an inflatable assembly in a step according to an embodiment of the present invention without an air collecting cover;

[0022] Figure 5 for Figure 4 A magnified schematic diagram of point B in the middle;

[0023] Figure 6 A schematic diagram of the positions of the steps and the inflatable assembly according to an embodiment of the present invention;

[0024] Figure 7 for Figure 6 Enlarged schematic diagram of point C in the middle;

[0025] Figure 8 is a schematic diagram of a connecting portion according to an embodiment of the present invention;

[0026] Figure 9 is a schematic diagram of a fixing portion according to an embodiment of the present invention;

[0027] Figure 10 This is a schematic diagram of two ladder units detached from each other according to an embodiment of the present invention;

[0028] Figure 11 Schematic diagram of a ladder unit according to an embodiment of the present invention;

[0029] Figure 12 for Figure 11 Enlarged schematic diagram of point D in the middle.

[0030] The following are marked in the figure:

[0031] 1. Ladder rod; 2. Connecting part; 3. Ladder step; 4. Receiving groove; 5. Cushioning airbag; 6. Through groove; 7. First magnetic block; 8. Second magnetic block; 9. Inflatable airbag; 10. Blower wheel; 11. Middle groove; 12. Gear; 13. Rack; 14. Blade; 15. Air collecting cover; 16. Fixed ring; 17. Rotating sleeve; 18. Engaging groove; 19. Plate; 20. Operating handle; 21. Pin; 22. Fixing groove; 23. Boss; 24. Through hole; 25. First engaging groove; 26. Second engaging groove; 27. External support rod; 28. Vent; 29. Protective rubber strip; 30. Drum-shaped airbag; 31. Support ring; 32. Connecting shaft; 33. Anti-sliding block; 34. Air port. DETAILED DESCRIPTION

[0032] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to specific embodiments.

[0033] It should be noted that, unless otherwise defined, the technical or scientific terms used in the present invention should have the usual meanings understood by people with ordinary skills in the field to which the present invention belongs. The "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0034] A telescopic ladder with a buffer structure includes a plurality of ladder units, wherein the ladder units include two ladder rods 1, and two adjacent ladder units are slidably connected to each other through the ladder rods 1. The upper parts of the two ladder rods 1 are each installed with a connecting part 2, and a step 3 is rotatably installed between the two connecting parts 2. The lower surface of the step 3 is provided with a receiving groove 4 along its length direction, and a buffer airbag 5 is installed in the receiving groove 4. The buffer airbag 5 is filled with a certain amount of gas. Both sides of the step 3 are provided with a through groove 6 along its width direction, and a first magnetic block 7 is fixedly installed on the upper part of the through groove 6. The lower part is movably installed with a second magnetic block 8 by means of sliding connection, the upper part of the first magnetic block 7 and the lower part of the second magnetic block 8 have the same magnetic properties, an inflatable airbag 9 is installed between the first magnetic block 7 and the second magnetic block 8, the inflatable airbag 9 is connected to the buffer airbag 5, an inflatable component for inflating the buffer airbag 5 is installed between the accommodating groove 4 and the through groove 6, the inflatable component is transmission-connected with the second magnetic block 8, a buffer component is installed between the two ladder rods 1 slidably sleeved with each other, and a fixing portion for fixing the position of the ladder rod 1 is also installed on the connecting portion 2.

[0035] When the telescopic ladder needs to be folded, the lock of the clamping part on the ladder rod 1 is released, and the ladder rod 1 at the upper part slides downward under the action of its own weight. When the upper step 3 approaches the lower step 3, the upper part of the first magnetic block 7 and the lower part of the second magnetic block 8 have the same magnetism. Under the action of magnetism, the second magnetic block 8 located on the upper step slides into the through groove 6, and the second magnetic block 8 squeezes the inflatable airbag 9 in the through groove 6. The gas in the inflatable airbag 9 enters the buffer airbag 5 to inflate the buffer airbag 5, avoiding gas leakage caused by the buffer airbag 5 being placed for a long time. Due to space limitations, the gas that can be replenished in the inflatable airbag 9 is limited. In order to replenish the buffer airbag 5 with as much gas as possible, the second magnetic block 8 drives the inflation component to work when it moves, and the inflation component inflates the buffer airbag 5 so that there is enough gas in the buffer airbag 5 to inflate, forming protection for the lower surface of the upper step to prevent the user from pinching his fingers when placing his hand on the step 3.

[0036] In one embodiment, the inflation assembly includes a blower wheel 10, an intermediate groove 11 is provided between the accommodating groove 4 and the through groove 6, and the blower wheel 10 is rotatably installed in the intermediate groove 11. The blower wheel 10 includes a wheel disc, and a rotating shaft is installed in the middle of one side of the wheel disc. The rotating shaft extends into the through groove 6 and is installed with a gear 12. A rack 13 is installed on the upper surface of the second magnetic block 8, and the gear 12 is engaged with the rack 13. Blades 14 are provided on the other side of the wheel disc, and an air collecting hood 15 is rotatably installed on the wheel disc, and the air collecting hood 15 is connected to the buffer airbag 5.

[0037] Among them, when the second magnetic block 8 slides into the through groove 6, the rack 13 drives the gear 12 to rotate, the gear 12 drives the rotating shaft to rotate, and then drives the blower wheel 10 to rotate. The blower wheel 10 blows air into the air collecting cover 15, and the air flows to the buffer air bag 5. The diameter of the gear 12 is much smaller than the diameter of the blower wheel 10, so that the rack 13 can drive the gear 12 to rotate several more circles, and then the blower wheel 10 can blow in more air, so that the buffer air bag 5 is as full as possible when the two steps 3 approach each other, thereby playing a protective role.

[0038] In one embodiment, the connecting portion 2 includes a fixing ring 16, and the connecting portion 2 is mounted on the upper end of the ladder rod 1 through the fixing ring 16. A rotating sleeve 17 is installed on one side of the fixing ring 16, and one end of the step 3 is rotatably installed in the rotating sleeve 17. A torsion spring is installed between the rotating sleeve 17 and the step 3. The torsion spring keeps the plane of the step 3 perpendicular to the ladder rod 1 so that the first magnetic block 7 drives the second magnetic block 8 to slide into the through groove 6 through magnetic force. A snap-fit groove 18 is provided on the other side of the fixing ring 16, and the fastening portion enters the fixing ring 16 through the fastening groove 18 to fasten the ladder rod 1.

[0039] Specifically, the fastening portion includes a plate 19. A spring is installed between the plate 19 and the fixing ring 16. The spring applies a pulling force to the plate 19, causing the plate 19 to move closer to the fixing ring 16. A rotation hole is defined in the middle of the plate 19. An operating handle 20 is rotatably installed in the rotation hole. A latch 21 is rotatably installed at one end of the operating handle 20. The latch 21 is slidably mounted in the locking groove 18. A locking groove 22 is defined at the lower end of the ladder rod 1 to cooperate with the latch 21. When the ladder rod 1 is pulled outward until the latch 22 corresponds to the latch 21, the latch 21 engages with the latch 21 under the action of the spring, thereby fixing the positions of the two ladder rods 1 relatively. When the telescopic ladder needs to be stored, the operating handle 20 is pulled outward, causing the latch 21 to disengage from the latch 22, and the ladder rod 1 at the upper end slides downward under its own weight.

[0040] In one embodiment, a limiting portion for the distance between the fixing plate 19 and the fixing ring 16 is also installed between the clamping portion and the fixing ring 16, and a boss 23 is provided on one side of the fixing ring 16, and a through hole 24 connected to the engaging groove 18 is provided on the boss 23, and the operating handle 20 is rotatably installed in the through hole 24, and a first clamping groove 25 and a second clamping groove 26 are provided on the boss 23, and the first clamping groove 25 and the second clamping groove 26 are arranged perpendicular to each other, and the depth of the second clamping groove 26 is smaller than the depth of the first clamping groove 25, and the operating handle 20 is provided with a protrusion on the side facing the fixing ring 16, and the protrusion matches the first clamping groove 25 and the second clamping groove 26.

[0041] When the protrusion is engaged with the second locking groove 26, the locking pin 21 is separated from the locking groove 22, so as to facilitate the disassembly between the ladder units.

[0042] In one embodiment, external support rods 27 are further mounted on the outside of the ladder bars 1. The external support rods 27 on adjacent ladder bars 1 are slidably coupled to each other. A plurality of ventilation holes 28 are formed along the length of the external support rods 27. As the upper external support rod 27 slides toward the lower external support rod 27, the ventilation holes 28 are gradually blocked, and the rate at which air in the lower external support rod 27 is discharged outward gradually slows, thereby reducing the downward sliding speed of the upper ladder bar 1.

[0043] In one embodiment, a protective rubber strip 29 is further installed between two adjacent connecting parts 2. The protective rubber strip 29 prevents the falling ladder bar 1 from squeezing the hand of a person when the person places his hand on the ladder bar 1.

[0044] In one embodiment, the buffer assembly includes a drum-shaped airbag 30, a support ring 31 is installed in the middle of the drum-shaped airbag 30, and a connecting shaft 32 is installed in the middle of the support ring 31. The connecting shaft 32 extends from the upper part of the drum-shaped airbag 30 and is connected to the bottom of the ladder rod 1. A plurality of sliding grooves are evenly distributed on the annular surface of the support ring 31, and an anti-sliding block 33 is slidably installed in the sliding groove. An elastic member is installed between the anti-sliding block 33 and the support ring 31, and an air port 34 is opened at the lower part of the drum-shaped airbag 30. When the drum-shaped airbag 30 contacts the bottom of the ladder bar 1, the ladder bar 1 blocks the air port 34. When the ladder bar 1 continues to slide downward, it squeezes the drum-shaped airbag 30. The air pressure in the drum-shaped airbag 30 rises instantaneously, squeezing the anti-sliding block 33 out of the sliding groove. The anti-sliding block 33 rests against the inner wall of the ladder bar 1, further slowing down the sliding speed of the ladder bar 1. There are also some small holes on the upper part of the drum-shaped airbag 30. When the ladder bar 1 is in a stationary state, the gas in the drum-shaped airbag 30 is discharged from the small holes, making it easier for the ladder bar 1 to be pulled out again.

[0045] Optionally, the drum-shaped airbag 30 is made of rubber.

[0046] Based on the above embodiment, a method for using a telescopic ladder with a buffer structure is proposed, comprising the following steps:

[0047] Pull out the multiple ladder units in sequence, and the ladder units are locked together under the action of the clamping parts, so that the pulled-out ladder rods 1 are kept in fixed position with the adjacent ladder rods 1;

[0048] When the telescopic ladder needs to be folded, the lock of the clamping part on the ladder rod 1 is released, and the ladder rod 1 at the upper part slides downward under the action of its own weight. When the upper step 3 approaches the lower step 3, because the upper part of the first magnetic block 7 and the lower part of the second magnetic block 8 have the same magnetism, under the action of magnetism, the second magnetic block 8 located on the upper step slides into the through groove 6, and the second magnetic block 8 squeezes the inflatable airbag 9 in the through groove 6. The gas in the inflatable airbag 9 enters the buffer airbag 5. At the same time, the second magnetic block 8 drives the inflation component to work, and the inflation component blows air into the buffer airbag 5, causing the buffer airbag 5 to bulge, forming protection for the lower surface of the upper step. When the upper ladder rod 1 is about to drop to the bottom, the buffer component slows down the descending speed of the ladder rod 1.

[0049] The telescopic ladder with a buffer structure proposed in the present invention is provided with a first magnetic block 7 and a second magnetic block 8. Under the drive of magnetic force, the buffer airbag 5 is inflated, so that there is enough gas in the buffer airbag 5 to inflate, forming protection for the lower surface of the upper step, reducing the possibility of the user's fingers being pinched when placing the hand on the step 3. The provision of the protective rubber strip 29 reduces the possibility of the falling ladder bar 1 squeezing the human hand when the user places the hand on the ladder bar 1.

[0050] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples. Within the scope of the present invention, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the above aspects of the present invention, which are not provided in detail for the sake of simplicity.

[0051] The present invention is intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A telescopic ladder with a buffer structure, comprising a plurality of ladder units, wherein the ladder units comprise two ladder rods (1), and two adjacent ladder units are slidably connected to each other via the ladder rods (1), characterized in that: The upper parts of the two ladder rods (1) are both equipped with connecting parts (2), and a step (3) is rotatably installed between the two connecting parts (2). The lower surface of the step (3) is provided with a receiving groove (4) along its length direction, and a cushioning airbag (5) is installed in the receiving groove (4). Both sides of the step (3) are provided with through grooves (6) along its width direction. A first magnetic block (7) is fixedly installed on the upper part of the through groove (6), and a second magnetic block (8) is movably installed on the lower part of the through groove (6). The upper part of the first magnetic block (7) is in contact with the second magnetic block (8). The lower portion of the second magnetic block (8) has the same magnetic properties, an inflatable airbag (9) is installed between the first magnetic block (7) and the second magnetic block (8), the inflatable airbag (9) is connected to the buffer airbag (5), an inflatable component for inflating the buffer airbag (5) is installed between the accommodating groove (4) and the through groove (6), the inflatable component is connected to the second magnetic block (8) in a transmission manner, a buffer component is installed between the two ladder rods (1) that are slidably sleeved with each other, and a clamping portion for fixing the position of the ladder rod (1) is also installed on the connecting portion (2); The inflation assembly includes a blower wheel (10), an intermediate groove (11) is provided between the accommodating groove (4) and the through groove (6), the blower wheel (10) is rotatably installed in the intermediate groove (11), the blower wheel (10) includes a wheel disc, a rotating shaft is installed in the middle of one side of the wheel disc, the rotating shaft extends into the through groove (6) and is installed with a gear (12), a rack (13) is installed on the upper surface of the second magnetic block (8), the gear (12) is meshed with the rack (13), a blade (14) is provided on the other side of the wheel disc, an air collecting cover (15) is rotatably installed on the wheel disc, and the air collecting cover (15) is connected to the cushioning air bag (5); The connecting portion (2) includes a fixing ring (16), and the connecting portion (2) is sleeved on the upper end of the ladder rod (1) through the fixing ring (16); a rotating sleeve (17) is installed on one side of the fixing ring (16); one end of the ladder step (3) is rotatably installed in the rotating sleeve (17); a torsion spring is installed between the rotating sleeve (17) and the ladder step (3); a clamping groove (18) is provided on the other side of the fixing ring (16); the clamping portion enters the fixing ring (16) through the clamping groove (18) to clamp the ladder rod (1); The clamping portion includes a plate (19), a spring is installed between the plate (19) and the fixing ring (16), a rotation hole is opened in the middle of the plate (19), an operating handle (20) is rotatably installed in the rotation hole, a bayonet (21) is rotatably installed at one end of the operating handle (20), the bayonet (21) is slidably installed in the clamping groove (18), and a clamping groove (22) matching with the bayonet (21) is opened at the lower end of the ladder rod (1); The buffer assembly comprises a drum-shaped airbag (30), a support ring (31) is installed in the middle of the drum-shaped airbag (30), and a connecting shaft (32) is installed in the middle of the support ring (31).

2. The telescopic ladder with a buffer structure according to claim 1, characterized in that: A boss (23) is provided on one side of the fixing ring (16), and a through hole (24) is provided on the boss (23) and is connected to the engaging groove (18). The operating handle (20) is rotatably installed in the through hole (24). A first engaging groove (25) and a second engaging groove (26) are provided on the boss (23). The first engaging groove (25) and the second engaging groove (26) are arranged perpendicular to each other, and the depth of the second engaging groove (26) is smaller than the depth of the first engaging groove (25). A protrusion is provided on the side of the operating handle (20) facing the fixing ring (16), and the protrusion matches the first engaging groove (25) and the second engaging groove (26).

3. The telescopic ladder with a buffer structure according to claim 1, characterized in that: An external support rod (27) is also installed on the outside of the ladder rod (1), and the external support rods (27) on adjacent ladder rods (1) are slidably connected to each other. The surface of the external support rod (27) is provided with a plurality of ventilation holes (28) along its length direction.

4. The telescopic ladder with a buffer structure according to claim 1, characterized in that: A protective rubber strip (29) is also installed between two adjacent connecting parts (2).

5. The telescopic ladder with a buffer structure according to claim 1, characterized in that: The connecting shaft (32) extends from the upper part of the drum-shaped airbag (30) and is connected to the bottom of the ladder rod (1). A plurality of sliding grooves are evenly distributed on the annular surface of the support ring (31). An anti-sliding block (33) is slidably installed in the sliding groove. An elastic member is installed between the anti-sliding block (33) and the support ring (31). An air port (34) is opened at the lower part of the drum-shaped airbag (30).

6. The telescopic ladder with a buffer structure according to claim 5, characterized in that: The drum-shaped airbag (30) is made of rubber material.

7. A method for using the telescopic ladder with a buffer structure according to any one of claims 1 to 6, characterized in that: The steps include: Pulling apart the plurality of ladder units in sequence, the ladder units are mutually engaged under the action of the clamping parts, so that the pulled-out ladder rod (1) and the adjacent ladder rod (1) are kept in a fixed position; When the telescopic ladder needs to be folded up, the locking of the clamping portion on the ladder rod (1) is released, and the ladder rod (1) at the upper part slides downward under the action of its own weight. When the upper step (3) approaches the lower step (3), because the upper part of the first magnetic block (7) and the lower part of the second magnetic block (8) have the same magnetic properties, under the action of magnetism, the second magnetic block (8) on the upper step (3) slides into the through groove (6), and the second magnetic block (8) squeezes the inflatable airbag (9) in the through groove (6). The gas in the inflatable airbag (9) enters the buffer airbag (5). At the same time, the second magnetic block (8) drives the inflatable component to work, and the inflatable component blows air into the buffer airbag (5), causing the buffer airbag (5) to swell, forming protection for the lower surface of the upper step (3). When the upper ladder rod (1) is about to fall to the bottom, the buffer component slows down the descending speed of the ladder rod (1).

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