Novel combined ladder

Abstract

The utility model relates to the technical field of ladder assemblies, and discloses a novel combined ladder which comprises a ladder frame, a connecting frame and an anti-skid pedal, a plurality of groups of mounting grooves are symmetrically distributed on two walls of opposite outer sides of the ladder frame, and telescopic brackets are symmetrically distributed on the mounting grooves. According to the utility model, the telescopic bracket is arranged, so that when the ladder needs to be attached to a wall for fixed use, a user can start the electric telescopic rod to pull the supporting rod to unfold towards the two sides, swing the electric telescopic rod along the length direction of the groove and flexibly adjust the unfolding angle of the telescopic bracket, and when the ladder needs to be fixed, the supporting rod is pulled, so that a right angle is formed between the supporting rod and the connecting rod; the supporting rods are turned over through cooperation of the universal spherical hinge seats and the clamping grooves, the connecting rods are clamped and embedded in the clamping grooves, therefore, the unfolding angle of the telescopic supports is limited, finally, the telescopic supports unfolded on the two sides of the ladder frame are fixed to a wall through the supporting rods according to the actual situation of the wall, the whole ladder structure is assisted to be stabilized, and the safety and practicability of the ladder structure are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of ladder frames, in particular to a novel combined ladder. Background Art

[0002] Ladders usually refer to structures used for climbing or supporting. They can be fixed or portable. There are many types of ladders, including steel ladders, ladders, ladder scaffolds, etc. It is an important tool that is widely used in both the construction industry and daily life. When choosing a ladder, you should choose the most suitable type according to specific needs and usage conditions. Among them, ladders are composed of a ladder frame and pedals. They can be placed in a self-supporting manner for people to climb up and down. Ladders can be divided into straight ladders, telescopic straight ladders, folding ladders, telescopic folding ladders, combination ladders and fishing rod ladders according to their structural forms.

[0003] A Chinese utility model patent with announcement number CN217129410U discloses an assembled ladder, which belongs to the technical field of ladder racks. It mainly solves the problem that commonly used ladders are open-angle folding types, which can improve the stability of the ladder, but when encountering a relatively narrow space range, there is still the problem that it cannot be carried and is not convenient to store and carry. In view of the above-mentioned related technologies, the inventor believes that there are the following defects: Although in the above-mentioned prior art, a multi-stage ladder assembly is provided, and a detachable plug-in connection is formed to form an assembled ladder, the total height of the assembled ladder can be extended by plug-in connection of the multi-stage ladder assembly, so as to facilitate use in a construction environment.

[0004] However, in actual use, the existing modular ladders have multiple sets of ladder components that can be detachably plugged in and connected, and each ladder rod needs to be installed, which makes the assembly process complicated. In addition, the hooks of the existing hook ladders with hooks on the top usually cannot be rotated, which has low practicality and is easy to be unhooked. In addition, the ladder only relies on supports to stand, and usually lacks a stable supporting and fixed structure, and cannot be used against the wall, so it has low practicality and safety. Therefore, a new modular ladder is needed, which uses a telescopic bracket to assist in stabilizing the overall ladder structure and increase its safety. A fixing structure and an anti-slip structure are provided to ensure the safe use of the hook. A clamping component is provided to facilitate the fast and efficient assembly and installation of the ladder, thereby improving the practicality and safety of the overall modular ladder. Utility Model Content

[0005] In order to solve the technical problems that in actual use of the existing combined ladder, due to the provision of multiple sets of ladder components with detachable plug-in connections, each ladder rod needs to be installed, resulting in a complicated assembly process, and the existing hook ladders with hooks on the top usually have hooks that cannot be rotated, have low practicality, and are easy to be unhooked. In addition, the ladder only relies on support to stand, usually lacks a stable supporting and fixing structure, and has low safety, the utility model provides a new type of combined ladder.

[0006] The utility model is implemented by the following technical scheme: a novel combined ladder, comprising a ladder frame, a connecting frame and an anti-skid pedal, a plurality of groups of the connecting frames arranged at equal intervals are distributed and installed on the outer periphery of two groups of ladder frames, a plurality of groups of the anti-skid pedals are distributed and installed on the two opposite inner walls of each two groups of connecting frames, an L-fixing block or a square connecting block is distributed and installed on the top of the ladder frame, a hook frame is movably installed on the top of the L-fixing block through an embedded bearing support, wherein the two groups of ladder frames installed with the square connecting blocks are combined with the connecting frames and the anti-skid pedals to form a straight ladder, and the two groups of ladder frames installed with the L-fixing blocks are combined with the connecting frames, the anti-skid pedals and the hook frame to form a hook ladder;

[0007] The two relatively outer walls of the ladder frame are symmetrically provided with a plurality of mounting grooves, and the mounting grooves are symmetrically provided with telescopic brackets, and the telescopic brackets include a groove, an electric telescopic rod, a connecting rod, a support rod, a universal ball joint seat and a slot, wherein two groups of the universal ball joint seats are distributed and installed on the outer wall of one side of the support rod, and the grooves are distributed and opened on the groove wall on one side of the mounting groove, and the two groups of the electric telescopic rods are movably installed on the groove cavity bottom wall of the groove through the hinge seat, the connecting rod is installed on one end of the telescopic rod of the electric telescopic rod, and one end of the connecting rod is fixedly connected to the rotating ball valve of the universal ball joint seat, and the two groups of the slots are distributed and opened on the outer wall of one side of the support rod and on one side of the seat body of the universal ball joint seat.

[0008] Preferably, the L fixing block and the hook frame are provided with fixing structures for fixing the hook frame after rotation adjustment, and the L fixing block and the hook frame are provided with anti-slip structures for fastening the hook frame to prevent it from being detached;

[0009] The fixed structure includes an electromagnetic coil, a valve core and a fixed cavity. The fixed cavity is installed through the inside of the hook frame and the cross-section of the fixed cavity is cross-shaped. The electromagnetic coil is embedded and installed inside the L fixed block. The valve core is installed inside the electromagnetic coil through a spring, and one end of the valve core passes through the L fixed block and is located in the inner cavity of the fixed cavity.

[0010] Preferably, the anti-slip structure includes a hook cavity, a clockwork spring, a steel cable, a lock buckle and a lock base, a hole cavity, and a lock cavity. The hook cavity is opened inside the hook frame, the clockwork spring is installed in the inner cavity of the hook cavity, one end of the steel cable is fixedly installed on the clockwork spring, and the other end thereof is connected to the lock buckle. The lock base is embedded in an outer wall of one side of the L fixed block, the hole cavity passes through the outer wall of the lock base, and the lock cavity is opened inside the lock base.

[0011] Preferably, the lock buckle further includes a stopper, a movable cavity, a stepped column, a return spring and a lock core, wherein the stopper is located at the cavity opening of the hook cavity, and the movable cavity is opened at the top of the stopper.

[0012] Preferably, the step column is located in the movable cavity and moves through the bottom of the block, and the step column is connected to one end of the steel cable, the return spring is installed on the outer periphery of the step column and located in the movable cavity, and the lock core is installed at the bottom of the step column and located below the block.

[0013] Preferably, a square groove is provided at the bottom of the ladder frame, a trapezoidal sleeve is installed at the periphery of the ladder frame, and threaded holes are provided through the square connecting block, the square groove and the interior of the trapezoidal sleeve.

[0014] Preferably, the trapezoidal ferrule and the square groove are combined to form a connecting groove for clamping a square connecting block, and the interior of the threaded hole is matched with a fastening bolt to extend multiple groups of straight ladders or hook ladders.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] 1. The utility model is provided with a telescopic bracket. When the ladder needs to be fixed against the wall for use, the user can start the electric telescopic rod to pull the support rod to expand to both sides, and can swing the electric telescopic rod along the length direction of the groove to flexibly adjust the expansion angle of the telescopic bracket. When it needs to be fixed, the support rod is pulled to form a right angle between the support rod and the connecting rod. The support rod is flipped through the cooperation of the universal ball joint seat and the card slot, and the connecting rod is embedded in the card slot, thereby limiting the expansion angle of the telescopic bracket. Finally, according to the actual situation of the wall, the telescopic brackets expanded on both sides of the ladder frame can be fixed to the wall through the support rods, which is used to assist in stabilizing the overall ladder structure and increase its safety and practicality.

[0017] 2. The utility model is provided with a fixing structure and an anti-detachment structure. When the hook frame needs to be rotated, the electromagnetic coil is controlled to be energized to generate magnetic attraction to attract the valve core. When the hook frame needs to be fixed after rotating a certain angle, the electromagnetic coil is controlled to be de-energized so that the valve core is pushed into the inner cavity of the fixing cavity under the elastic force of the spring to fix the hook frame. When the hook frame is hooked on the tubular object, it is easy to be unhooked. The user can pull the block and cooperate with the clockwork spring to stretch the steel cable and wrap it around the hooked tubular object, and lock the steel cable to the lock base through the lock buckle, thereby firmly binding the hook frame to the hooked tubular object, avoiding the ladder from being unhooked during use, and improving the safety of the overall ladder.

[0018] 3. The utility model is provided with a clamping assembly composed of a square connecting block, a square groove, a trapezoidal clamping sleeve, a threaded hole and a fastening bolt. When the length of the ladder needs to be extended, the user can align the bottom of a group of straight ladders or hook ladders that need to be assembled and connected with the top of another group of straight ladders, so that the square connecting block is clamped into the connecting groove formed by the trapezoidal clamping sleeve and the square groove. Finally, the two groups of ladders are firmly connected and assembled through the cooperation of the fastening bolts and the threaded holes. The number of assembled ladders can be increased according to actual use requirements. Therefore, by setting the clamping assembly, it is convenient to quickly and efficiently combine and install the ladder, thereby improving the practicality and safety of the overall combined ladder. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the overall hook-ladder structure provided by the utility model;

[0020] Figure 2 This is a schematic diagram of the overall straight ladder structure of the utility model;

[0021] Figure 3 This is a schematic diagram of the unfolded structure of the telescopic bracket of the utility model;

[0022] Figure 4 for Figure 3 A is an enlarged structural diagram;

[0023] Figure 5 This is a schematic diagram of the hook frame fixing structure of the utility model;

[0024] Figure 6 This is a schematic diagram of the hook frame anti-slip structure of the utility model;

[0025] Figure 7 for Figure 5 The enlarged structural diagram at B in FIG.

[0026] Figure 8 This is a schematic diagram of the telescopic bracket structure of the utility model;

[0027] Fig. 9 for Figure 8 The enlarged structural diagram at C in FIG.

[0028] Fig.10 This is a diagram of the telescopic support structure of the utility model in an expanded state;

[0029] Fig.11 This is a schematic diagram of the hook ladder\straight ladder clamping structure of the utility model;

[0030] Fig.12 The utility model is a schematic diagram of the structure of the combined ladder.

[0031] In the figure: 1. ladder frame; 2. connecting frame; 3. anti-skid pedal; 4. L fixing block; 5. square connecting block; 6. straight ladder; 7. hook frame; 8. hook cavity; 9. spring spring; 10. steel rope; 11. lock buckle; 1101. block; 1102. movable cavity; 1103. ladder column; 1104. reset spring; 1105. lock core; 12. lock base; 1201. hole cavity; 1202. lock cavity; 13. electromagnetic coil; 14. valve core; 15. fixing cavity; 16. hook ladder; 17. installation groove; 18. groove; 19. electric telescopic rod; 20. connecting rod; 21. support rod; 22. universal ball joint seat; 23. slot; 24. square slot; 25. trapezoidal sleeve; 26. threaded hole; 27. fastening bolt. DETAILED DESCRIPTION

[0032] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment.

[0033] Embodiment 1:

[0034] See also Figure 1 - Figure 2 A novel combined ladder of this embodiment comprises a ladder frame 1, a connecting frame 2 and an anti-skid pedal 3. A plurality of connecting frames 2 arranged at equal intervals are distributed and installed on the outer periphery of two sets of ladder frames 1. A plurality of anti-skid pedals 3 are distributed and installed on the two opposite inner walls of each two sets of connecting frames 2. An L fixing block 4 or a square connecting block 5 is distributed and installed on the top of the ladder frame 1. A hook frame 7 is movably installed on the top of the L fixing block 4 by embedding a bearing support.

[0035] Among them, two sets of ladder frames 1 equipped with square connecting blocks 5 are combined with connecting frames 2 and anti-slip pedals 3 to form a straight ladder 6, and two sets of ladder frames 1 equipped with L fixing blocks 4 are combined with connecting frames 2, anti-slip pedals 3 and hook frames 7 to form a hook ladder 16.

[0036] Embodiment 2:

[0037] See also Figure 3 - Figure 7In this embodiment, a fixing structure is distributed on the L fixing block 4 and the hook frame 7, which is used to fix the hook frame 7 after rotation adjustment. The fixing structure is composed of an electromagnetic coil 13, a valve core 14 and a fixing cavity 15, wherein the fixing cavity 15 is installed through the inside of the hook frame 7 and the cross section of the fixing cavity 15 is cross-shaped, the electromagnetic coil 13 is embedded and installed inside the L fixing block 4, the valve core 14 is installed inside the electromagnetic coil 13 through a spring, and one end of the valve core 14 is installed through the L fixing block 4 and located in the inner cavity of the fixing cavity 15;

[0038] Further, the hook frame 7 is movably installed on the top of the L fixing block 4 by embedding the bearing support, so that the hook frame 7 can be rotated for use. Due to the provision of the cross-shaped fixing cavity 15, the rotation angle of the hook frame 7 is limited to ninety degrees or one hundred and eighty degrees. According to the use occasion and the rotation angle of the hook frame 7, the hook ladder 16 can be hooked on the wall through the hook frame 7. When the hook frame 7 needs to be rotated, the electromagnetic coil 13 is controlled to be energized to generate magnetic attraction to attract the valve core 14. At this time, the spring is in a compressed state, so that the valve core 14 is separated from the fixing cavity 15, and the hook frame 7 can be rotated. When the hook frame 7 needs to be fixed after rotating a certain angle, the electromagnetic coil 13 is controlled to be disconnected and the electromagnetic attraction disappears. The valve core 14 is pushed into the inner cavity of the fixing cavity 15 under the elastic force of the spring, and the hook frame 7 is fixed by the cooperation of the valve core 14 and the fixing cavity 15. Therefore, the hook frame 7 can be rotated and fixed by setting the fixing structure, which is convenient for its application in different occasions and improves the practicality of the overall hook ladder 16.

[0039] In this embodiment, the L fixing block 4 and the hook frame 7 are provided with an anti-slip structure for fastening the hook frame 7 to prevent it from being unhooked. The anti-slip structure is composed of a hook cavity 8, a spring spring 9, a steel cable 10, a lock buckle 11, a lock base 12, a hole cavity 1201, and a lock cavity 1202. The lock buckle 11 also includes a stopper 1101, a movable cavity 1102, a step column 1103, a reset spring 1104, and a lock core 1105. The hook cavity 8 is opened inside the hook frame 7, the spring spring 9 is installed in the inner cavity of the hook cavity 8, one end of the steel cable 10 is fixedly installed on the spring spring 9, and the other end thereof is connected to the step column 11 in the lock buckle 11. On the lock body 103, the stopper 1101 is located at the cavity opening of the hook cavity 8, the movable cavity 1102 is opened at the top of the stopper 1101, the step column 1103 is located in the cavity of the movable cavity 1102 and movably penetrates the bottom of the stopper 1101, the return spring 1104 is installed on the outer periphery of the step column 1103 and is located in the cavity of the movable cavity 1102, the lock core 1105 is installed at the bottom of the step column 1103 and is located below the stopper 1101, the lock base 12 is embedded and installed on one side outer wall of the L fixed block 4, the hole 1201 penetrates and is opened on the outer wall of the lock base 12, and the lock cavity 1202 is opened inside the lock base 12;

[0040] Furthermore, when the hook frame 7 is hooked on the tubular object, it is easy to unhook. The user can pull the block 1101 and cooperate with the spring spring 9 to stretch the steel cable 10 and wrap it around the hooked tubular object, so that the lock buckle 11 is close to the lock base 12. When locking, first pass the lock core 1105 through the hole 1201. When the bottom of the block 1101 hits the lock base 12, press the step column 1103 to send the lock core 1105 into the inner cavity of the lock cavity 1202, and then rotate the step column 1103 to drive the lock core 1105 to rotate a certain angle and then release it. The lock core 1105 is locked inside the lock cavity 1202 under the elastic force of the return spring 1104, and the steel cable 10 is locked to the lock base 12 through the lock buckle 11, thereby firmly binding the hook frame 7 to the hooked tubular object, avoiding the ladder from being unhooked during use, and improving the safety of the overall ladder.

[0041] Embodiment 3:

[0042] See also Figure 8 - Fig.10 In this embodiment, the two opposite outer walls of the ladder frame 1 are symmetrically provided with a plurality of mounting grooves 17, and the mounting grooves 17 are symmetrically provided with telescopic brackets, which include grooves 18, electric telescopic rods 19, connecting rods 20, support rods 21, universal ball joint seats 22 and card slots 23, wherein two groups of universal ball joint seats 22 are distributed and installed on one side outer wall of the support rod 21, the grooves 18 are distributed and opened on one side groove wall of the mounting groove 17, two groups of electric telescopic rods 19 are movably installed on the groove cavity bottom wall of the groove 18 through hinge seats, the connecting rod 20 is installed on one end of the telescopic rod of the electric telescopic rod 19, and one end of the connecting rod 20 is fixedly connected to the rotating ball valve of the universal ball joint seat 22, and two groups of card slots 23 are distributed and opened on one side outer wall of the support rod 21 and one side of the seat body of the universal ball joint seat 22;

[0043] Furthermore, telescopic brackets are distributed on the ladder frames 1 of the straight ladder 6 and the hook ladder 16. When the ladder needs to be fixed against the wall for use, the user can start the electric telescopic rod 19 to pull the support rod 21 to expand to both sides. The bottom of the electric telescopic rod 19 is installed on the bottom wall of the groove 18 through a hinge seat. One end of the telescopic rod of the electric telescopic rod 19 is movably connected to the side wall of the support rod 21 through the cooperation of the connecting rod 20 and the universal ball joint seat 22. Therefore, the electric telescopic rod 19 can be swung along the length direction of the groove 18 to flexibly adjust the expansion angle of the telescopic bracket according to the actual The unfolded length of the support rod 21 can be controlled by extending or contracting one end of the electric telescopic rod 19 according to usage needs. When fixing is required, the support rod 21 is pulled to form a right angle between the support rod 21 and the connecting rod 20. The support rod 21 is flipped through the cooperation of the universal ball joint seat 22 and the card slot 23, and the connecting rod 20 is embedded in the card slot 23, thereby limiting the unfolding angle of the telescopic bracket. Finally, according to the actual situation of the wall, the telescopic brackets unfolded on both sides of the ladder frame 1 can be fixed to the wall through the support rod 21, which is used to assist in stabilizing the overall ladder structure and increase its safety.

[0044] Embodiment 4:

[0045] See also Fig.11 - Fig.12 In this embodiment, a square groove 24 is provided at the bottom of the ladder frame 1, a trapezoidal clamp 25 is installed on the outer periphery of the ladder frame 1, and threaded holes 26 are provided inside the square connecting block 5, the square groove 24, and the trapezoidal clamp 25. The trapezoidal clamp 25 and the square groove 24 form a connecting groove for clamping the square connecting block 5. The inside of the threaded hole 26 is matched and connected with a fastening bolt 27 to extend the combination of multiple straight ladders 6 or hook ladders 16;

[0046] Furthermore, the clamping assembly is composed of a square connecting block 5, a square groove 24, a trapezoidal clamping sleeve 25, a threaded hole 26 and a fastening bolt 27. When the length of the ladder needs to be extended, the user can align the bottom of a group of straight ladders 6 or hook ladders 16 that need to be assembled and connected with the top of another group of straight ladders 6, so that the square connecting block 5 is clamped into the connecting groove formed by the trapezoidal clamping sleeve 25 and the square groove 24. The threaded holes 26 distributed on the square connecting block 5, the square groove 24 and the trapezoidal clamping sleeve 25 are located on the same central axis. Finally, the two groups of ladders are firmly connected and assembled through the cooperation of the fastening bolts 27 and the threaded holes 26. The number of assembled ladders can be increased according to actual usage requirements. Therefore, by setting the clamping assembly, it is convenient to quickly and efficiently combine and install the ladders, thereby improving the practicality and safety of the overall combined ladder.

[0047] Working principle: When the length of the ladder needs to be extended, the user can insert the square connecting block 5 of one set of ladders into the connecting groove formed by the trapezoidal clamping sleeve 25 and the square groove 24 on the other set of ladders, and then firmly connect and assemble the two sets of ladders by fastening the bolts 27 and the threaded holes 26. The number of assembled ladders can be increased according to actual use requirements, which is convenient for fast and efficient combination and installation of ladders; when the ladder needs to be fixed against the wall, the user can start the electric telescopic rod 19 to pull the support rod 21 to expand to both sides, and when it needs to be fixed, pull the support rod 21 to form a right angle with the connecting rod 20, and then flip the support rod 21, and embed the connecting rod 20 in the card groove 23, thereby limiting the expansion angle of the telescopic bracket, and finally, according to the actual situation of the wall, the telescopic brackets expanded on both sides of the ladder frame 1 can be fixed to the wall through the support rod 21, which is used to assist in stabilizing the overall ladder structure and increase its safety;

[0048] Two sets of ladder frames 1 with square connecting blocks 5 are combined with connecting frames 2 and anti-skid pedals 3 to form a straight ladder 6. Two sets of ladder frames 1 with L fixing blocks 4 are combined with connecting frames 2, anti-skid pedals 3 and hook frames 7 to form a hook ladder 16. When the hook frame 7 needs to be rotated, the electromagnetic coil 13 is controlled to be energized to generate magnetic attraction to attract the valve core 14. When the hook frame 7 needs to be fixed after rotating a certain angle, the electromagnetic coil 13 is controlled to be de-energized so that the valve core 14 is pushed into the inner cavity of the fixing cavity 15 under the elastic force of the spring to fix the hook frame 7. When the hook frame 7 is hooked on a tubular object, it is easy to unhook. The user can pull the stopper 1101 and cooperate with the clockwork spring 9 to stretch the steel cable 10 and wrap it around the hooked tubular object, and lock the steel cable 10 on the lock base 12 through the lock buckle 11, thereby firmly binding the hook frame 7 to the hooked tubular object, avoiding the ladder from being unhooked during use, and improving the safety of the overall ladder.

[0049] The above-mentioned implementation modes are only preferred implementation modes of the present invention, and cannot be used to limit the protection scope of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A novel modular ladder, comprising a ladder frame (1), a connecting frame (2) and an anti-skid pedal (3), wherein a plurality of groups of the connecting frames (2) are arranged at equal intervals and are distributed and installed on the outer periphery of two groups of ladder frames (1), and a plurality of groups of the anti-skid pedal (3) are distributed and installed on two opposite inner walls of each two groups of connecting frames (2), characterized in that: The top of the ladder frame (1) is distributedly installed with an L-fixing block (4) or a square connecting block (5), and the top of the L-fixing block (4) is movably installed with a hook frame (7) by embedding a bearing support, wherein two sets of ladder frames (1) installed with square connecting blocks (5) are combined with a connecting frame (2) and an anti-slip pedal (3) to form a straight ladder (6), and two sets of ladder frames (1) installed with L-fixing blocks (4) are combined with a connecting frame (2), an anti-slip pedal (3) and a hook frame (7) to form a hook ladder (16); The ladder frame (1) has two relatively outer walls symmetrically provided with a plurality of mounting grooves (17). The mounting grooves (17) are symmetrically provided with telescopic brackets. The telescopic brackets include a groove (18), an electric telescopic rod (19), a connecting rod (20), a support rod (21), a universal ball joint seat (22) and a clamping groove (23). The two groups of the universal ball joint seats (22) are distributed and installed on the outer wall of one side of the support rod (21). The grooves (18) are distributed and opened on the groove wall of one side of the mounting groove (17). The two groups of the electric telescopic rods (19) are movably installed on the groove cavity bottom wall of the groove (18) through the hinge seat. The connecting rod (20) is installed on one end of the telescopic rod of the electric telescopic rod (19), and one end of the connecting rod (20) is fixedly connected to the rotating ball valve of the universal ball joint seat (22). The two groups of the clamping grooves (23) are distributed and opened on the outer wall of one side of the support rod (21) and one side of the seat body of the universal ball joint seat (22).

2. A new type of combined ladder according to claim 1, characterized in that: The L fixing block (4) and the hook frame (7) are provided with fixing structures for fixing the hook frame (7) after rotation adjustment, and the L fixing block (4) and the hook frame (7) are provided with anti-slip structures for fastening the hook frame (7) to prevent it from being detached; The fixing structure comprises an electromagnetic coil (13), a valve core (14) and a fixing cavity (15); the fixing cavity (15) is installed through the inside of the hook frame (7) and the cross section of the fixing cavity (15) is cross-shaped; the electromagnetic coil (13) is embedded and installed inside the L fixing block (4); the valve core (14) is installed inside the electromagnetic coil (13) through the movement of a spring; and one end of the valve core (14) is installed through the L fixing block (4) and is located in the inner cavity of the fixing cavity (15).

3. A new type of combined ladder according to claim 2, characterized in that: The anti-drop structure comprises a hook cavity (8), a clockwork spring (9), a steel cable (10), a lock buckle (11), a lock base (12), a hole cavity (1201), and a lock cavity (1202); the hook cavity (8) is arranged inside the hook frame (7); the clockwork spring (9) is installed in the inner cavity of the hook cavity (8); one end of the steel cable (10) is fixedly installed on the clockwork spring (9), and the other end thereof is connected to the lock buckle (11); the lock base (12) is embedded and installed on one side outer wall of the L fixing block (4); the hole cavity (1201) passes through the outer wall of the lock base (12); and the lock cavity (1202) is arranged inside the lock base (12).

4. A new type of combined ladder according to claim 3, characterized in that: The lock buckle (11) further comprises a stopper (1101), a movable cavity (1102), a stepped column (1103), a return spring (1104) and a lock core (1105), wherein the stopper (1101) is located at the cavity opening of the hook cavity (8), and the movable cavity (1102) is opened at the top of the stopper (1101).

5. A new type of combined ladder according to claim 4, characterized in that: The step column (1103) is located in the movable cavity (1102) and movably passes through the bottom of the stopper (1101), and the step column (1103) is connected to one end of the steel cable (10), the return spring (1104) is installed on the outer periphery of the step column (1103) and is located in the movable cavity (1102), and the lock core (1105) is installed at the bottom of the step column (1103) and is located below the stopper (1101).

6. A novel combined ladder according to claim 1, characterized in that: A square groove (24) is provided at the bottom of the ladder frame (1), a trapezoidal clamping sleeve (25) is installed on the outer periphery of the ladder frame (1), and threaded holes (26) are provided through the square connection block (5), the square groove (24) and the trapezoidal clamping sleeve (25).

7. A new type of combined ladder according to claim 6, characterized in that: The trapezoidal clamping sleeve (25) and the square groove (24) are combined to form a connecting groove for clamping the square connecting block (5); the interior of the threaded hole (26) is matched with a fastening bolt (27) to extend the combination of multiple straight ladders (6) or hook ladders (16).

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