CN219158897U - Lengthened ladder device of climbing ladder - Google Patents

Abstract

The utility model relates to the field of ascending working tools, in particular to an ascending cat ladder lengthening ladder device which comprises a ladder frame, a cat ladder, a fixing component, a supporting component and an anti-falling component; the ladder frame is of a U-shaped frame structure, a first chute is formed in the two inner side walls of the ladder frame along the vertical direction, a first limiting block is arranged at the bottom of the first chute, and a second chute is formed in the upper part of the ladder frame along the horizontal direction; the climbing ladder is in sliding fit with a first sliding groove on the ladder frame, a convex clamping block is arranged at the top end of the climbing ladder, a first groove is formed in the lower part of one side of the climbing ladder, which is close to the wall, in the vertical direction, and a lifting handle is arranged at the bottom of the climbing ladder; the fixed component is in sliding fit with a second chute on the ladder frame; the support component is hinged in the first groove of the cat ladder; the anti-drop assembly is hinged at the bottom end of the ladder frame. This application has improved extension ladder's flexibility ratio and practicality, has reduced the occupation in space, has improved stability and work efficiency, ensures staff's security of ascending a height, going down the ladder, guarantee personal safety.

Description

Lengthened ladder device of climbing ladder

Technical Field

The utility model relates to the field of climbing operation tools, in particular to a climbing ladder lengthening ladder device.

Background

In the existing building construction technology, all need with the help of setting up the cat ladder at the lateral part, or the courtyard when ascending a height, and the cat ladder is all set up the position higher in the downside, because regulation, standard requirement must set up the safety cage on the higher cat ladder of height to and the cat ladder of bottom is higher in the step position of first step during climbing the roof, all need personnel to ascend a height with the help of relevant appurtenance, borrow appurtenance is thick platform, and longer ladder, and is wasted time and energy, and very inconvenient.

Chinese patent CN212177006U discloses a pluggable ladder, which is characterized in that an elongated ladder is provided for the ladder post of the main ladder, and the elongated ladder is mainly composed of a first elongated strut, a second elongated strut and an elongated ladder step connected. The main ladder adopts the detachable grafting concatenation mode to make the height of main ladder longer with the extension ladder, is provided with the reinforcement locking structure specially in extension concatenation department, and this reinforcement locking structure comprises guard shield and locking structure, and wherein, the guard shield is the cover body of slot form or slice structure, and the one end rotation of guard shield is connected on one of main ladder grafting section and extension ladder grafting section, and the other end of guard shield forms detachable fixed connection with another one of them through locking structure, and the device has simple structure, and is small, is favorable to transportation, storage and the characteristics of moving.

However, in the actual use process, the splicing process is relatively complex, the working efficiency is reduced, the stability of the spliced part is not ensured, and the use safety is reduced.

Disclosure of Invention

To above-mentioned problem, provide a climbing cat ladder extension ladder device, solved work efficiency low, the security performance is low through fixed subassembly, supporting component and the anticreep subassembly that set up.

In order to solve the problems in the prior art, the utility model adopts the following technical scheme:

the utility model provides a climbing cat ladder extension ladder device, includes ladder frame, cat ladder, fixed subassembly, supporting component and anticreep subassembly; the ladder frame is of a U-shaped frame structure, a first chute is formed in the two inner side walls of the ladder frame along the vertical direction, a first limiting block is arranged at the bottom of the first chute, and a second chute is formed in the upper part of the ladder frame along the horizontal direction; the climbing ladder is in sliding fit with a first sliding groove on the ladder frame, a convex clamping block is arranged at the top end of the climbing ladder, a first groove is formed in the lower portion of one side, close to the wall, of the climbing ladder along the vertical direction, a first shaft hole penetrating through the stepping is formed in the bottom of the first groove, and a lifting handle is arranged at the bottom of the climbing ladder; the fixing component is in sliding fit with a second sliding groove on the ladder frame, and is used for fixing the ladder frame at the bottom of the ascending ladder; the support component is hinged in the first groove of the cat ladder; the anti-drop assembly is hinged at the bottom end of the ladder frame.

Preferably, the fixed component comprises a sliding block, a screw rod, a rotary disc and a clamping block; the sliding block is in sliding fit with the second sliding groove, a third sliding groove is formed in the sliding block along the extension part of the sliding block, and a second shaft hole penetrating through the third sliding groove is formed in the upper part of the sliding block; the screw rod is rotatably inserted into the second shaft hole; the rotary table is fixedly connected with one end, far away from the sliding block, of the screw rod, and tooth grooves convenient to twist are formed in the peripheral wall of the rotary table; the clamping block is in sliding fit with a third chute on the sliding block, a first hole is formed in the center of the upper portion of the clamping block, and the first hole is in threaded fit with the screw rod.

Preferably, the support assembly comprises a first support rod, a second support rod and a connecting shaft; the first support rod is provided with two third shaft holes penetrating through the first support rod, the third shaft holes are coaxially arranged with the first shaft holes, the upper surface of the first support rod is provided with a second groove downwards, and the peripheral wall of the first support rod is provided with a limiting hole communicated with the second groove; the second support rods are inserted into the second grooves and are in sliding fit with the second grooves, the top ends of the second support rods are fixedly connected with stabilizing blocks, and the bottoms of the second support rods are provided with third grooves; the connecting shaft is coaxially arranged with the first shaft hole, and two ends of the connecting shaft are inserted into the third shaft hole and fixedly connected with the third shaft hole.

Preferably, a first clamping piece, a first guide post and a first spring are arranged in the second supporting rod; the first clamping piece is arranged in the third groove in a sliding manner, the first clamping piece is matched with a limiting hole on the side wall of the first supporting rod, and a second limiting block is arranged at the bottom of the first clamping piece; the first guide post is fixedly connected to the center of the bottom of the first clamping piece; the first spring is sleeved on the first guide post, and two ends of the first spring are respectively abutted against the lower surface of the first clamping piece and the bottom surface of the third groove.

Preferably, the anti-falling component comprises a rotating shaft, a baffle, a lap ring and a hasp; a fourth shaft hole is formed in one side of the bottom of the first chute, and the rotating shaft and the fourth shaft hole are coaxially arranged; one side of the baffle is provided with a fifth through shaft hole which is fixedly connected with the rotating shaft, the baffle is hinged to the bottom of the first chute through the rotating shaft, the lower surface of the baffle is provided with a bump, and the bump is provided with a second hole; the lap ring is an elastic piece, two ends of the lap ring are of a circular shaft type U-shaped structure, and the structures at the two ends are mutually connected by a torsion spring; the hasp is in a circular arc structure and is fixedly connected to one side, close to the lap ring, of the lower surface of the ladder frame.

Preferably, an elastic component is arranged in the cat ladder; the elastic component is fixedly arranged on the upper part in the first groove of the crawling ladder, and the elastic component is abutted with the stabilizing block on the second supporting rod.

Preferably, the elastic component comprises a second clamping piece, a second guide post and a second spring; a fourth groove is formed in the inner top of the first groove in an outward extending mode, a second clamping piece is arranged at the upper portion in the fourth groove in a sliding mode, the upper surface of the second clamping piece is abutted to a stabilizing block on the second supporting rod, and a third limiting block is arranged at the bottom of the second clamping piece; the second guide post is fixedly connected to the center of the bottom of the second clamping piece; the second spring is sleeved on the second guide post, and two ends of the second spring are respectively abutted against the lower surface of the second clamping piece and the bottom surface of the fourth groove.

Compared with the prior art, the beneficial effects of this application are:

1. the support component that this application was through setting up makes the cat ladder bottom support on the wall, has increased the stability of cat ladder bottom, has improved stability and work efficiency, ensures the security that the staff ascended a height, step down, guarantee personal safety.

2. This application is fixed the cat ladder in the bottom of ascending a height the ladder through the fixed subassembly that sets up, need not install repeatedly and dismantle, has improved the practicality of extension ladder, has reduced the occupation in space, improves work efficiency.

3. The elastic component that this application was through setting up can make things convenient for the staff to use and adjust the bracing piece, further improves work efficiency, and regulatory function also makes this device have the flexibility ratio.

Drawings

FIG. 1 is a schematic perspective view of the present application mounted to the bottom of a climbing ladder;

FIG. 2 is a front view of the present application mounted to the bottom of a step ladder;

FIG. 3 is a schematic perspective view of the present application;

FIG. 4 is a schematic perspective view of a securing assembly of the present application;

FIG. 5 is a front view of the support assembly of the present application;

FIG. 6 is a schematic perspective view of the support assembly of the present application installed in a ladder;

FIG. 7 is a top view of a second support bar of the present application;

FIG. 8 is a cross-sectional view at A-A of FIG. 7 of the present application;

FIG. 9 is a perspective view of the mounting member within the second support bar of the present application;

FIG. 10 is a bottom view of the ladder frame of the present application;

FIG. 11 is a partial enlarged view of FIG. 10B of the present application;

FIG. 12 is a side view of the spring assembly of the present application installed in a ladder;

FIG. 13 is an enlarged view of a portion of the present application at C in FIG. 12;

fig. 14 is a schematic perspective view of an elastic assembly of the present application.

The reference numerals in the figures are:

1-a ladder rack;

2-climbing a ladder; 2 A-An elastic component; 2a 1-a second clamping piece; 2a 2-a second guide post; 2a 3-a second spring;

3-fixing the assembly; 3 A-A slider; 3 b-a screw rod; 3 c-a turntable; 3 d-clamping blocks;

4-a support assembly; 4 A-A first support bar; 4 b-a second support bar; 4b 1-a first clip; 4b 2-first guide post; 4b 3-a first spring; 4 c-a connecting shaft;

5-an anti-drop assembly; 5 A-A rotating shaft; 5 b-baffle; 5 c-lapping; 5 d-hasp.

Detailed Description

The utility model will be further described in detail with reference to the drawings and the detailed description below, in order to further understand the features and technical means of the utility model and the specific objects and functions achieved.

See fig. 1-14:

the utility model provides a climbing cat ladder extension ladder device, includes ladder frame 1, cat ladder 2, fixed subassembly 3, supporting component 4 and anticreep subassembly 5;

the ladder frame 1 is of a U-shaped frame structure, first sliding grooves are formed in the two inner side walls of the ladder frame 1 along the vertical direction, first limiting blocks are arranged at the bottoms of the first sliding grooves, and second sliding grooves are formed in the upper portion of the ladder frame 1 along the horizontal direction;

the crawling ladder 2 is in sliding fit with a first sliding groove on the ladder frame 1, a convex clamping block is arranged at the top end of the crawling ladder 2, a first groove is formed in the lower portion of one side, close to the wall, of the crawling ladder 2 along the vertical direction, a first shaft hole penetrating through the stepping is formed in the bottom of the first groove, and a lifting handle is arranged at the bottom of the crawling ladder 2;

the fixing component 3 is in sliding fit with a second sliding groove on the ladder frame 1, and the fixing component 3 is used for fixing the ladder frame 1 at the bottom of the ascending ladder;

the support component 4 is hinged in the first groove of the cat ladder 2;

the anti-falling component 5 is hinged at the bottom end of the ladder frame 1.

Can fix ladder frame 1 in the bottom of climbing ladder by wall one side through fixed subassembly 3 regulation locking, when the staff needs to ascend a height the operation, the anticreep subassembly 5 of opening ladder frame 1 bottom exposes the cat ladder 2 of sliding connection on ladder frame 1, make cat ladder 2 downwardly moving through handle traction cat ladder 2, until the fixture block on cat ladder 2 is blocked by first stopper in the first spout, cat ladder 2 no longer downwardly moving, open supporting component 4 this moment, adjust supporting component 4's length and locking along the horizontal direction according to the distance between the bottom of cat ladder 2 and the wall, make cat ladder 2 bottom steady support on the wall, and then the staff can ascend a height the operation with the help of cat ladder 2, can get back to the ground with the help of cat ladder 2 after the staff finishes the operation of ascending a height, in the first recess of cat ladder 2 lower part handle is not used, make cat ladder 2 upwards move until in the first spout of cat ladder 2 bottom whole gets into frame 1 through traction cat ladder 2, the closed anticreep subassembly 5 has been opened at this moment, the convenience of use of the safety guarantee of how the personnel has been solved, the safety and safety of the safety has been guaranteed, the safety has been solved, the safety has been used for the safety of the personnel.

See fig. 4:

the fixed component 3 comprises a sliding block 3a, a screw rod 3b, a rotary disc 3c and a clamping block 3d;

the sliding block 3a is in sliding fit with the second sliding groove, a third sliding groove is formed in the sliding block 3a along the extension part of the sliding block, and a second shaft hole penetrating through the third sliding groove is formed in the upper part of the sliding block 3 a;

the screw rod 3b is rotatably inserted into the second shaft hole;

the rotary disc 3c is fixedly connected with one end, far away from the sliding block 3a, of the screw rod 3b, and tooth grooves which are convenient to twist are formed in the peripheral wall of the rotary disc 3 c;

the clamping block 3d is in sliding fit with a third sliding groove on the sliding block 3a, and a first hole is formed in the center of the upper portion of the clamping block and is in threaded fit with the screw rod 3 b.

The lower surface lap joint of the extending part on the sliding block 3a is enabled to be connected to the step of the ascending ladder through the position of the sliding block 3a, the sliding block 3a can be enabled to be abutted to the ladder columns on two sides of the ascending ladder, the rotating disc 3c is twisted at the moment to enable the screw rod 3b to rotate, the screw rod 3b drives the clamping block 3d to move towards the step of the ascending ladder and enable the step side wall to be abutted to the bottom of the ascending ladder, accordingly the ladder frame 1 is fixed at the bottom of the ascending ladder, stability of the ladder frame 1 relative to the ascending ladder can be guaranteed when the ascending ladder is used for ascending operation, the lengthened ladder device can still be suspended at the bottom of the ascending ladder and fixed when workers do not ascend, the problem that how to fix the lengthened ladder device on the ascending ladder is solved, repeated installation and disassembly are not needed, working efficiency is improved, occupied space is reduced, stability of the ladder frame 1 is improved, and personal safety of workers is guaranteed when the ladder frame is used.

See fig. 5-6:

the support assembly 4 comprises a first support rod 4a, a second support rod 4b and a connecting shaft 4c;

the first support rods 4a are provided with two first shaft holes, the bottoms of the first support rods 4a are provided with third shaft holes penetrating through the first support rods 4a, the third shaft holes are coaxially arranged with the first shaft holes, the upper surfaces of the first support rods 4a are provided with second grooves downwards, and the peripheral walls of the first support rods 4a are provided with limiting holes communicated with the second grooves;

the two second support rods 4b are inserted in the second grooves and are in sliding fit with the second grooves, the top ends of the second support rods 4b are fixedly connected with stabilizing blocks, and the bottoms of the second support rods 4b are provided with third grooves;

the connecting shaft 4c is coaxially arranged with the first shaft hole, and two ends of the connecting shaft are inserted into the third shaft hole and fixedly connected with the third shaft hole.

When the staff carries out the operation of ascending a height, open anticreep subassembly 5 and pull down cat ladder 2, put down first bracing piece 4a to horizontal position this moment, connecting axle 4c can make the first bracing piece 4a synchronous motion of cat ladder 2 both sides, further pull second bracing piece 4b to the wall according to the distance of wall to cat ladder 2 bottom and remove, adjust the position and the locking of second bracing piece 4b, make the stable piece on second bracing piece 4b top and wall looks butt, the area of contact with the wall has been increased to the stable piece, further improved the stability of second bracing piece 4b, after the staff finishes the operation of ascending a height, withdraw second bracing piece 4b to in the first bracing piece 4a, withdraw first bracing piece 4a to in the first recess of cat ladder 2 bottom, finally withdraw cat ladder 2 to in the ladder frame 1 so that use next time, the problem of how to make cat ladder 2 bottom stable on the wall has been improved stability and practicality, staff's personal safety has been guaranteed.

See fig. 7-9:

the second support rod 4b is internally provided with a first clamping piece 4b1, a first guide post 4b2 and a first spring 4b3;

the first clamping piece 4b1 is arranged in the third groove in a sliding manner, the first clamping piece 4b1 is matched with a limiting hole on the side wall of the first supporting rod 4a, and a second limiting block is arranged at the bottom of the first clamping piece 4b 1;

the first guide post 4b2 is fixedly connected to the center of the bottom of the first clamping piece 4b 1;

the first spring 4b3 is sleeved on the first guide post 4b2, and two ends of the first spring are respectively abutted against the lower surface of the first clamping piece 4b1 and the bottom surface of the third groove.

When the first support rod 4a is adjusted to the horizontal position, the second support rod 4b is pulled to move to the wall surface, the second support rod 4b is adjusted according to the distance from the wall surface to the upper surface of the second support rod 4b, in the pulling process, when the first clamping piece 4b1 moves to the limiting hole, the compressed first spring 4b3 bounces the first clamping piece 4b1, the second limiting block on the first clamping piece 4b1 enables the first clamping piece 4b1 not to be separated from the third groove, at the moment, the second support rod 4b is locked at the current position by the cooperation of the first clamping piece 4b1 and the limiting hole, if the distance is insufficient, the second support rod 4b can be pulled to be close to the wall surface continuously, until the stabilizing block on the second support rod 4b can be abutted to the wall surface, the first clamping piece 4b1 can be pressed down when a worker finishes the ascending operation, the second support rod 4b is pulled back to the first support rod 4a, and then the first support rod 4a is recovered to the first groove, the problem of locking the support rod 4 is solved, the flexibility and the safety and stability of the ascending operation are guaranteed.

See fig. 10-11:

the anti-falling assembly 5 comprises a rotating shaft 5a, a baffle 5b, a lap ring 5c and a hasp 5d;

a fourth shaft hole is formed in one side of the bottom of the first chute, and the rotating shaft 5a and the fourth shaft hole are coaxially arranged;

a fifth through hole is formed in one side of the baffle 5b, the fifth through hole is fixedly connected with the rotating shaft 5a, the baffle 5b is hinged to the bottom of the first chute through the rotating shaft 5a, a bump is arranged on the lower surface of the baffle 5b, and a second hole is formed in the bump;

the lap ring 5c is an elastic piece, two ends of the lap ring are of a circular shaft type U-shaped structure, and the structures at the two ends are mutually connected by a torsion spring;

the hasp 5d is in a circular arc structure and is fixedly connected to one side, close to the lap ring 5c, of the lower surface of the ladder frame 1.

When the climbing ladder is not used, the retainer 5c is buckled on the buckle 5d, so that the baffle 5b is horizontally fixed at the bottom of the first groove of the ladder frame 1, the ladder 2 is prevented from slipping downwards, when a worker needs to climb the ladder, the retainer 5c is pulled to enable the retainer 5c to be separated from the buckle 5d, because the bottom of the baffle 5b is hinged at the bottom of the first chute of the ladder frame 1 through the rotating shaft 5a, the baffle 5b sags under the action of gravity when the retainer 5c is opened, the ladder 2 is exposed, the ladder 2 is pulled out along the first chute, when the climbing operation is finished, the ladder 2 is lifted upwards and recovered into the first chute of the ladder frame 1, and at the moment, the retainer 5c is buckled on the buckle 5d again, so that the baffle 5b is rotated to a horizontal position, the problem of how to prevent the ladder 2 from falling off is solved, the using time of the ladder 2 is prolonged, and the space occupation of the ladder 2 is also reduced.

See fig. 12-13:

an elastic component 2a is arranged in the cat ladder 2;

the elastic component 2a is fixedly arranged at the upper part in the first groove of the crawling ladder 2, and the elastic component 2a is abutted with the stabilizing block on the second supporting rod 4 b.

When the ladder stand 2 is pulled to move downwards, when the first groove leaves the first chute of the ladder stand 1, the ladder stand 1 can not abut against the stabilizing block on the second support rod 4b any more, the elastic component 2a ejects the second support rod 4b so as to drive the first support rod 4a to be ejected, the first support rod 4a is conveniently and subsequently adjusted to be at the horizontal position, the second support rod 4b is conveniently adjusted, when the first support rod 4a and the second support rod 4b are retracted, the stabilizing block of the second support rod 4a at the time is pressed against the elastic component 2a, the ladder stand 2 is continuously lifted upwards until the first groove enters the first chute of the ladder stand 1, the ladder stand 1 can abut against the stabilizing block on the second support rod 4b at the time so that the second support rod 4b can not be ejected, the next use is also facilitated, the problem of how to conveniently use the support component 4 is solved, the practicability is improved, and meanwhile, the working efficiency is also improved.

See fig. 14:

the elastic component 2a comprises a second clamping piece 2a1, a second guide post 2a2 and a second spring 2a3;

a fourth groove is formed in the inner top of the first groove in an outward extending mode, a second clamping piece 2a1 is arranged at the upper portion in the fourth groove in a sliding mode, the upper surface of the second clamping piece 2a1 is abutted to a stabilizing block on a second supporting rod 4b, and a third limiting block is arranged at the bottom of the second clamping piece 2a 1;

the second guide post 2a2 is fixedly connected to the center of the bottom of the second clamping piece 2a 1;

the second spring 2a3 is sleeved on the second guide post 2a2, and two ends of the second spring are respectively abutted against the lower surface of the second clamping piece 2a1 and the bottom surface of the fourth groove.

When the ladder stand 2 is still in the first groove in the body, the ladder stand 1 supports the stabilizing block on the second supporting rod 4b tightly, so that the stabilizing block supports the second clamping piece 2a1, the second clamping piece 2a1 supports the second spring 2a3 to enable the second spring 2a3 to be in a compressed state, when the ladder stand 2 is pulled downwards to enable the first groove to leave the first sliding groove of the ladder stand 1, the second spring 2a3 supports the second clamping piece 2a1 and then enables the stabilizing block on the second supporting rod 4b to be ejected, the second supporting rod 4b is driven to be ejected, the third limiting block on the second clamping piece 2a1 enables the second clamping piece 2a1 not to be ejected by the second spring 2a3 to be separated from the fourth groove, and then conveniently follow-up with first bracing piece 4a to horizontal position and adjust second bracing piece 4b, when packing up first bracing piece 4a and second bracing piece 4b, press the steady piece of first bracing piece 4a upper portion second bracing piece 4b this moment and support tight elastic component 2a, continue upwards hold up cat ladder 2 until first recess gets into in the first spout of ladder frame 1, ladder frame 1 can support the steady piece on the second bracing piece 4b this moment and tightly make second bracing piece 4b can not be popped out, also be convenient for use next time, the problem of how to pop up supporting component 4 convenient to use has been solved, the practicality is improved, work efficiency is also improved simultaneously.

The foregoing examples merely illustrate one or more embodiments of the utility model, which are described in greater detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims (7)

1. The lengthened ladder device of the climbing ladder is characterized by comprising a ladder frame (1), a ladder stand (2), a fixing assembly (3), a supporting assembly (4) and an anti-falling assembly (5);

the ladder frame (1) is of a U-shaped frame structure, first sliding grooves are formed in the two inner side walls of the ladder frame (1) along the vertical direction, first limiting blocks are arranged at the bottoms of the first sliding grooves, and second sliding grooves are formed in the upper portion of the ladder frame (1) along the horizontal direction;

the climbing ladder (2) is in sliding fit with a first sliding groove on the ladder frame (1), a convex clamping block is arranged at the top end of the climbing ladder (2), a first groove is formed in the lower portion of one side, close to a wall, of the climbing ladder (2) along the vertical direction, a first shaft hole penetrating through the stepping is formed in the bottom of the first groove, and a lifting handle is arranged at the bottom of the climbing ladder (2);

the fixing component (3) is in sliding fit with a second sliding groove on the ladder frame (1), and the fixing component (3) is used for fixing the ladder frame (1) at the bottom of the climbing ladder;

the support component (4) is hinged in a first groove of the crawling ladder (2);

the anti-falling component (5) is hinged at the bottom end of the ladder frame (1).

2. A climbing ladder extension ladder device according to claim 1, characterized in that the fixing assembly (3) comprises a slide block (3 a), a screw rod (3 b), a turntable (3 c) and a clamping block (3 d);

the sliding block (3 a) is in sliding fit with the second sliding groove, a third sliding groove is formed in the sliding block (3 a) along the extension part of the sliding block, and a second shaft hole penetrating through the third sliding groove is formed in the upper part of the sliding block (3 a);

the screw rod (3 b) is rotatably inserted into the second shaft hole;

the rotary disc (3 c) is fixedly connected with one end, far away from the sliding block (3 a), of the screw rod (3 b), and tooth grooves which are convenient to twist are formed in the peripheral wall of the rotary disc (3 c);

the clamping block (3 d) is in sliding fit with a third sliding groove on the sliding block (3 a), a first hole is formed in the center of the upper portion of the clamping block, and the first hole is in threaded fit with the screw rod (3 b).

3. A ladder extension device according to claim 1, characterized in that the support assembly (4) comprises a first support bar (4 a), a second support bar (4 b) and a connecting shaft (4 c);

the first support rods (4 a) are provided with two, the bottoms of the first support rods are provided with third shaft holes penetrating through the first support rods (4 a), the third shaft holes are coaxially arranged with the first shaft holes, the upper surfaces of the first support rods (4 a) are provided with second grooves downwards, and the peripheral walls of the first support rods (4 a) are provided with limiting holes communicated with the second grooves;

the two second support rods (4 b) are inserted into the second grooves and are in sliding fit with the second grooves, the top ends of the second support rods (4 b) are fixedly connected with stabilizing blocks, and the bottoms of the second support rods (4 b) are provided with third grooves;

the connecting shaft (4 c) is coaxially arranged with the first shaft hole, and two ends of the connecting shaft are inserted into the third shaft hole and fixedly connected with the third shaft hole.

4. A climbing ladder extension ladder device according to claim 3, characterized in that the second support bar (4 b) is provided with a first clamping piece (4 b 1), a first guide post (4 b 2) and a first spring (4 b 3);

the first clamping piece (4 b 1) is arranged in the third groove in a sliding mode, the first clamping piece (4 b 1) is matched with a limiting hole in the side wall of the first supporting rod (4 a), and a second limiting block is arranged at the bottom of the first clamping piece (4 b 1);

the first guide post (4 b 2) is fixedly connected to the center of the bottom of the first clamping piece (4 b 1);

the first spring (4 b 3) is sleeved on the first guide post (4 b 2), and two ends of the first spring are respectively abutted with the lower surface of the first clamping piece (4 b 1) and the bottom surface of the third groove.

5. The lengthened ladder device of the climbing ladder according to claim 1, wherein the anti-falling component (5) comprises a rotating shaft (5 a), a baffle (5 b), a lap ring (5 c) and a hasp (5 d);

a fourth shaft hole is formed in one side of the bottom of the first chute, and a rotating shaft (5 a) and the fourth shaft hole are coaxially arranged;

a fifth through hole is formed in one side of the baffle (5 b), the fifth through hole is fixedly connected with the rotating shaft (5 a), the baffle (5 b) is hinged to the bottom of the first chute through the rotating shaft (5 a), a bump is arranged on the lower surface of the baffle (5 b), and a second hole is formed in the bump;

the lap ring (5 c) is an elastic piece, two ends of the lap ring are of a circular shaft type U-shaped structure, and the structures at two ends are mutually connected by a torsion spring;

the hasp (5 d) is of a circular arc structure and is fixedly connected to one side, close to the lap ring (5 c), of the lower surface of the ladder frame (1).

6. A climbing ladder extension ladder device according to claim 1, characterized in that an elastic component (2 a) is arranged in the ladder (2);

the elastic component (2 a) is fixedly arranged at the upper part in the first groove of the cat ladder (2), and the elastic component (2 a) is abutted with the stabilizing block on the second supporting rod (4 b).

7. The lengthened ladder device of claim 6, characterized in that the elastic component (2 a) comprises a second clamping piece (2 a 1), a second guide post (2 a 2) and a second spring (2 a 3);

a fourth groove is outwards formed in the inner top of the first groove in an extending mode, a second clamping piece (2 a 1) is arranged at the upper portion in the fourth groove in a sliding mode, the upper surface of the second clamping piece (2 a 1) is abutted to a stabilizing block on a second supporting rod (4 b), and a third limiting block is arranged at the bottom of the second clamping piece (2 a 1);

the second guide post (2 a 2) is fixedly connected to the center of the bottom of the second clamping piece (2 a 1);

the second spring (2 a 3) is sleeved on the second guide post (2 a 2), and two ends of the second spring are respectively abutted against the lower surface of the second clamping piece (2 a 1) and the bottom surface of the fourth groove.

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