Single column electric telescopic ladder

Abstract

The application discloses a single-column electric telescopic ladder, belonging to the technical field of ladders, comprising a plurality of ladder pipes, a plurality of pipe sleeves, a plurality of steps, a driving structure, a locking structure, a connecting piece, a switch and a bottom frame, the diameters of the plurality of ladder pipes gradually decrease from bottom to top, adjacent ladder pipes are connected in a nested sliding mode, the plurality of pipe sleeves are provided with interface ends and sleeve hole ends, the two ends of the steps are fixedly connected with the interface ends of the pipe sleeves and the connecting piece respectively, the sleeve hole ends of the plurality of pipe sleeves are sleeved on the plurality of ladder pipes, the ladder pipes are connected with the plurality of pipe sleeves, the locking structure is arranged in the interface end on the same side of the pipe sleeve, the bottom of the ladder pipe is fixedly connected with the driving structure, the switch is electrically connected with the driving structure, and the lower end of the bottom ladder pipe is fixedly connected with the bottom frame, so that the stability of the single-column electric telescopic ladder is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of ladders, more particularly to a single-column electric telescopic ladder. BACKGROUND

[0002] The telescopic ladder is a ladder that can be stretched and shortened like a fishing rod, divided into two types: manual telescopic ladder and electric telescopic ladder; it is very convenient to carry and store, can be placed in the closet, study, under the bed or in the trunk of the car, with super light weight, super short height, super strong safety, humanized design, and elegant appearance, making the product sell well all over the world, and it is an ideal ladder for high-altitude operation of families, hotels, shopping malls, enterprises, electric power and telecommunications, urban construction, public security and fire protection, heating and gas supply, and garden departments, etc., but the manual telescopic ladder has low stretching and shortening efficiency, and the electric telescopic ladder on the market has a pair of ladder pipes fixed with a plurality of pedals that allow both feet to step at the same time, resulting in a heavy and redundant overall structure, large space occupation, and instability during stretching and shortening of the telescopic ladder, which can easily cause damage and deviation of the ladder pipe and pedal during movement, thereby affecting use; therefore, a stable electric telescopic ladder with small space occupation, easy to move, and closely locked adjacent pedals is needed. SUMMARY

[0003] The technical problem to be solved by the present application is to provide a single-column electric telescopic ladder that can meet the requirements of small space occupation, easy to move, and stability.

[0004] The single-column electric telescopic ladder of the present application comprises a plurality of ladder pipes, a plurality of pipe sleeves, a plurality of pedals, a driving structure, a locking structure, a connecting piece, a switch, and a chassis, the diameters of the plurality of ladder pipes gradually decrease from bottom to top, the adjacent ladder pipes are nested and slidingly connected, the plurality of pipe sleeves are provided with an interface end and a sleeve hole end, the two ends of the pedal are fixedly connected with the interface end of the pipe sleeve and the connecting piece, respectively, the sleeve hole end of the plurality of pipe sleeves is sleeved on the plurality of ladder pipes, the ladder pipe is connected with the plurality of pipe sleeves, the locking structure is arranged in the interface end on the same side of the pipe sleeve, the bottom of the ladder pipe is fixedly connected with the driving structure, the switch is electrically connected with the driving structure, and the lower end of the bottom ladder pipe is fixedly connected with the chassis, thereby increasing the stability of the single-column electric telescopic ladder.

[0005] As a further improvement of the present application, the pipe sleeve comprises a double-sided pipe sleeve and a single-sided pipe sleeve, the double-sided pipe sleeve has interface ends on both sides, the single-sided pipe sleeve has an interface end only on the side provided with the locking structure, the sleeve hole end of the plurality of double-sided pipe sleeves is fixedly connected with the bottom ladder pipe, the upper end of the top ladder pipe is fixedly connected with the sleeve hole end of one double-sided pipe sleeve, the interface end of each double-sided pipe sleeve is fixedly connected with one pedal, the remaining ladder pipes between the bottom ladder pipe and the top ladder pipe are sequentially and alternately slidingly connected with the double-sided pipe sleeve and the single-sided pipe sleeve, and the single-sided pipe sleeve and the double-sided pipe sleeve are sequentially and alternately fixedly connected with one pedal, thereby forming a single-side stepping area that alternates with each other, reducing the space occupation of the single-column electric telescopic ladder, facilitating movement and placement, and optimizing the structure to save costs.

[0006] As a further improvement of the application, the locking structure comprises a spring sleeve, a spring, a lock catch and a lock pin, the sleeve hole end of the pipe sleeve is provided with a lock groove, the inner side is provided with a circular through hole, the spring sleeve is fixedly connected with the pipe sleeve, one side of the spring sleeve is provided with a spring groove, the spring is arranged in the spring groove, one end of the spring in contact with the spring groove bottom of the spring sleeve is fixedly connected with the spring sleeve, one end of the lock pin penetrates through the circular through hole of the pipe sleeve, the other end of the lock pin is compressed in the spring groove of the spring sleeve, the lock pin is slidingly connected with the pipe sleeve, the middle end of the lock pin is provided with a clamping part, the lower end of the lock catch is inserted into the two sides of the lock pin and abuts against one side of the clamping part of the lock pin close to the circular through hole of the pipe sleeve, the pipe sleeve is provided with a groove matched with the lock catch, the middle part of the lock catch is rotationally connected with the pipe sleeve at the groove and forms a lever structure with the pipe sleeve, the lock catch is provided with a lock tongue at the rotation end, and the lock tongue is clamped with the lock groove.

[0007] As a further improvement of the application, the inner side of each ladder pipe is provided with an upper, when the fixing holes of any two adjacent ladder pipes are operated to the hole positions of the lock pins of each other, the lock pins are popped out to lock the two adjacent ladder pipes, and the ladder pipe can drive the next ladder pipe to extend and retract.

[0008] As a further improvement of the application, the driving structure comprises a motor and a lead screw, the motor is fixedly connected to the bottom of the bottom end ladder pipe, the motor is a driving motor with a reducer, the lead screw comprises a light shaft part and a threaded part, one end of the light shaft part of the lead screw is directly connected to the motor, the transmission structure is optimized, the ladder pipe further comprises a plurality of nuts, the nuts are installed at the lower end of the ladder pipe, the threaded part of the lead screw is threadedly connected with the nuts, the threaded part of the lead screw can drive each ladder pipe to vertically extend and retract, and the lithium battery which can be disassembled and charged is arranged below the switch.

[0009] As a further improvement of the application, the bottom frame comprises a bottom plate and a pair of fixed rods, the bottom plate is fixedly connected with the bottom end ladder pipe, the lower ends of the pair of fixed rods are fixedly connected to the upper end of the bottom plate, the connecting piece is provided with a fixing hole, and the pair of fixed rods are fixedly connected through the fixing hole and the connecting piece, so that the pressure on the bottom of the telescopic ladder is reduced, the stability of the bottom of the telescopic ladder is increased, the length of the fixed rod is not more than the length of the bottom end ladder pipe, and interference of the fixed rod to the ladder pipe when the telescopic ladder is retracted is prevented.

[0010] As a further improvement of the application, the connecting piece comprises a one-way connecting piece and a two-way connecting piece, only one side of the one-way connecting piece is provided with a protrusion which can be inserted into the pedal, and the other side is closed; both sides of the two-way connecting piece are provided with protrusions which can be inserted into the pedal, the other end of the pedal connected with the side of the pipe sleeve where the locking structure is located is fixedly connected with the two-way connecting piece, and the other end of the pedal connected with the side of the pipe sleeve without the locking structure is fixedly connected with the one-way connecting piece.

[0011] As a further improvement of the present application, the unlocking plate is fixedly connected below the pipe sleeve at the upper end of the chassis, the unlocking plate comprises a resisting plate, a pair of unlocking springs and a fixed bolt, the resisting plate is provided with a pair of through holes, the resisting plate and the pair of unlocking springs are respectively sleeved on the fixed bolt and the fixed rod, the resisting plate is located below the unlocking springs, the fixed bolt is fixedly connected with the pipe sleeve, and the upper surface of the resisting plate is in contact with the lock tongue in the locked state; when the single-column electric telescopic ladder is ready to be lowered, the resisting plate is moved upward, the unlocking springs are compressed to make the resisting plate press the lock tongue, the lock catch is rotated, the lock pin is retracted through the lever to complete the unlocking of the locking structure.

[0012] As a further improvement of the present application, the unlocking plate is fixedly connected below the pipe sleeve at the upper end of the chassis, the unlocking plate comprises a resisting plate, a pair of unlocking springs and a fixed bolt, the resisting plate is provided with a pair of through holes, the resisting plate and the pair of unlocking springs are respectively sleeved on the fixed bolt and the fixed rod, the resisting plate is located below the unlocking springs, the fixed bolt is fixedly connected with the pipe sleeve, and the upper surface of the resisting plate is in contact with the lock tongue in the locked state; when the single-column electric telescopic ladder is ready to be lowered, the resisting plate is moved upward, the unlocking springs are compressed to make the resisting plate press the lock tongue, the lock catch is rotated, the lock pin is retracted through the lever to complete the unlocking of the locking structure.

[0013] Compared with the prior art, the present application has the advantages that: the single-column electric telescopic ladder is provided with alternating single-side stepping areas, which reduces the occupied space of the single-column electric telescopic ladder, facilitates moving and placing, optimizes the structure and saves costs; the locking structure is interlocked in the pipe sleeve, which increases the stability of the telescopic ladder after contraction; the motor is a driving motor with a built-in speed reducer, which optimizes the transmission structure; the length of the fixed rod is not more than the length of the bottom end ladder pipe, which prevents the fixed rod from interfering with the ladder pipe during contraction of the telescopic ladder. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 The structure of the present application is shown in the figure;

[0015] Figure 2 The structure of the present application is shown in the figure;

[0016] Figure 3 The telescopic ladder is shown in the figure;

[0017] Figure 4 The locking structure of the present application is shown in the figure;

[0018] Figure 5 The locking structure of the present application is shown in the figure;

[0019] Figure 6 The driving structure of the present application is shown in the figure;

[0020] Figure 7 The structure of the present application is shown in the figure;

[0021] Figure 8 The structure of the present application is shown in the figure; Figure 7 The enlarged view of area A in the figure;

[0022] Figure 9 The structure of the present application is shown in the figure;Figure 7 Enlarged view of the middle B region.

[0023] Explanation of the reference numerals in the figures:

[0024] Ladder pipe 1; fixed hole 1-1; nut 1-2; pipe sleeve 2; double-sided pipe sleeve 2-1; single-sided pipe sleeve 2-2; lock groove 2-3; pedal 3; drive structure 4; motor 4-1; lead screw 4-2; lithium battery 4-3; locking structure 5; spring sleeve 5-1; spring 5-2; lock catch 5-3; lock tongue 5-3-1; lock pin 5-4; unlocking plate 6; abutting plate 6-1; unlocking spring 6-2; fixing bolt 6-3; connecting piece 7; one-way connecting piece 7-1; two-way connecting piece 7-2; switch 8; chassis 9; bottom plate 9-1; fixed rod 9-2. DETAILED DESCRIPTION

[0025] Specific embodiment one: please refer to Figures 1-6 The present application relates to a single-column electric telescopic ladder, comprising a plurality of ladder pipes 1, a plurality of pipe sleeves 2, a plurality of pedals 3, a drive structure 4, a locking structure 5, a connecting piece 7, a switch 8 and a chassis 9, the diameters of the plurality of ladder pipes 1 gradually decrease from bottom to top, the adjacent ladder pipes 1 are connected in a nested sliding manner, the plurality of pipe sleeves 2 are provided with interface ends and sleeve hole ends, the pedals 3 are respectively fixedly connected with the interface ends of the pipe sleeves 2 and the connecting piece 7 at both ends, the sleeve hole ends of the plurality of pipe sleeves 2 are sleeved on the plurality of ladder pipes 1, the ladder pipes 1 are connected with the plurality of pipe sleeves 2, the locking structure 5 is arranged in the interface end on the same side of the pipe sleeve 2, the bottom of the ladder pipe 1 is fixedly connected with the drive structure 4, the switch 8 is electrically connected with the drive structure 4, and the lower end of the bottom ladder pipe 1 is fixedly connected with the chassis 9, thereby increasing the stability of the single-column electric telescopic ladder.

[0026] In further embodiments, as shown in Figure 2 The pipe sleeve 2 comprises a double-sided pipe sleeve 2-1 and a single-sided pipe sleeve 2-2, the double-sided pipe sleeve 2-1 has interface ends on both sides, the single-sided pipe sleeve 2-2 has an interface end only on the side provided with the locking structure 5, the bottom ladder pipe 1 is fixedly connected with the sleeve hole ends of the plurality of double-sided pipe sleeves 2-1, the upper end of the top ladder pipe 1 is fixedly connected with the sleeve hole end of one double-sided pipe sleeve 2-1, the interface ends of each double-sided pipe sleeve 2-1 are fixedly connected with one pedal 3, the remaining ladder pipes 1 between the bottom ladder pipe 1 and the top ladder pipe 1 are sequentially and alternately connected in a sliding manner with the double-sided pipe sleeves 2-1 and the single-sided pipe sleeves 2-2, and the single-sided pipe sleeves 2-2 and the double-sided pipe sleeves 2-1 are sequentially and alternately fixedly connected with one pedal 3, thereby forming a single-side pedaling region which alternates with each other, reducing the occupied space of the single-column electric telescopic ladder, facilitating the movement and placement, and optimizing the structure to save costs.

[0027] In further embodiments, as shown in Figure 2As shown, the connecting piece 7 includes a one-way connecting piece 7-1 and a two-way connecting piece 7-2. The one-way connecting piece 7-1 is provided with a protrusion on one side only for inserting the pedal, and the other side is closed. The two-way connecting piece 7-2 is provided with protrusions on both sides for inserting the pedal. The other end of the pedal 3 connected with the side of the pipe sleeve 2 where the locking structure 5 is located is fixedly connected with the two-way connecting piece 7-2. The other end of the pedal 3 connected with the side of the two-sided pipe sleeve 2-1 without the locking structure 5 is fixedly connected with the one-way connecting piece 7-1.

[0028] In further embodiments, as shown in Figure 4 The locking structure 5 includes a spring sleeve 5-1, a spring 5-2, a lock catch 5-3, and a lock pin 5-4. The sleeve hole end of the pipe sleeve 2 is provided with a lock groove 2-3 and an inner circular through hole. The spring sleeve 5-1 is fixedly connected with the pipe sleeve 2. The spring sleeve 5-1 is provided with a spring groove on one side. The spring 5-2 is arranged in the spring groove. One end of the spring 5-2 in contact with the spring groove bottom of the spring sleeve 5-1 is fixedly connected with the spring sleeve 5-1. One end of the lock pin 5-4 penetrates through the circular through hole of the pipe sleeve 2, and the other end compresses the spring 5-2 in the spring groove of the spring sleeve 5-1. The lock pin 5-4 is slidingly connected with the pipe sleeve 2. The middle end of the lock pin 5-4 is provided with a clamping portion. The lower end of the lock catch 5-3 is inserted into the two sides of the lock pin 5-4 and abuts against one side of the clamping portion of the lock pin 5-4 close to the circular through hole of the pipe sleeve 2. The pipe sleeve 2 is provided with a matching recess of the lock catch 5-3. The middle part of the lock catch 5-3 is rotationally connected with the pipe sleeve 2 at the recess and forms a lever structure with the pipe sleeve 2. The rotating end of the lock catch 5-3 is provided with a lock tongue 5-3-1. The lock tongue 5-3-1 is clamped with the lock groove 2-3.

[0029] In further embodiments, as shown in Figure 5 The inner side of each ladder pipe 1 is provided with a fixing hole 1-1. When the fixing holes 1-1 of any two adjacent ladder pipes 1 are operated to the hole positions of the lock pins 5-4 of each other, the lock pins 5-4 are popped out to lock the two adjacent ladder pipes 1. The ladder pipe 1 can drive the next ladder pipe 1 to operate.

[0030] In further embodiments, as shown in Figure 6 The driving structure 4 includes a motor 4-1 and a lead screw 4-2. The motor 4-1 is fixedly connected to the bottom of the bottom ladder pipe 1. The motor 4-1 is a driving motor with a built-in reducer. The lead screw 4-2 includes a light shaft part and a threaded part. One end of the light shaft part of the lead screw 4-2 is directly connected to the motor 4-1, which optimizes the transmission structure. The ladder pipe 1 further includes a plurality of nuts 1-2 installed at the lower end of the ladder pipe 1. The threaded part of the lead screw 4-2 is threadedly connected with the nuts 1-2. The threaded part of the lead screw 4-2 can drive each ladder pipe 1 to vertically and telescopically operate. The detachable lithium battery 4-3 is arranged below the switch 8.

[0031] In further embodiments, as shown in Figure 3As shown, the base frame 9 includes a base plate 9-1 and a pair of fixing rods 9-2. The base plate 9-1 is fixedly connected to the bottom ladder tube 1. The lower ends of the pair of fixing rods 9-2 are fixedly connected to the upper end of the base plate 9-1. The connector 7 is provided with fixing holes. The pair of fixing rods 9-2 pass through the fixing holes and are fixedly connected to the connector 7. The length of the fixing rods 9-2 does not exceed the length of the bottom ladder tube 1 to prevent the fixing rods 9-2 from interfering with the ladder tube 1 when the telescopic ladder is retracted.

[0032] In a further embodiment, such as Figure 4 As shown, it also includes an unlocking plate 6, which is fixedly connected to the lower part of the sleeve 2 at the upper end of the base frame 9. The unlocking plate 6 includes a stop plate 6-1, a pair of unlocking springs 6-2, and a fixing bolt 6-3. The stop plate 6-1 has a pair of through holes. The stop plate 6-1 and the pair of unlocking springs 6-2 are respectively sleeved on the fixing bolt 6-3 and the fixing rod 9-2. The stop plate 6-1 is located below the unlocking springs 6-2. The fixing bolt 6-3 and the sleeve 2 are fixedly connected to ensure that the upper surface of the stop plate 6-1 is in contact with the locking tongue 5-3-1 in the locked state. When the single-column electric telescopic ladder is about to descend, the stop plate 6-1 is moved upward, the unlocking springs 6-2 are compressed, causing the stop plate 6-1 to press against the locking tongue 5-3-1, the latch 5-3 rotates, and the locking pin 5-4 is retracted through the lever to complete the unlocking of this section of the locking structure 5.

[0033] When using the single-column electric telescopic ladder, step on switch 8. Motor 4-1 drives screw 4-2 to rotate, which in turn rotates nut 1-2, thus extending or retracting the ladder tube 1. When the ladder tube 1 extends to the corresponding fixing hole 1-1, locking pin 5-4 compresses spring 5-2, which, through leverage, rotates latch 5-3. Lock tongue 5-3-1 disengages from lock groove 2-3, and spring 5-2 rebounds, inserting locking pin 5-4 into fixing hole 1-1 of ladder tube 1, completing the self-locking of ladder tube 1. Place the single-column electric telescopic ladder against a wall or similar support in the work area. After confirming its stability, climb the ladder to begin work. When ladder tube 1 descends, move the stop plate 6-1 upwards to unlock. Spring compression 6-2 causes the stop plate 6-1 to press against the latch 5-3-1, and the latch 5-3 rotates. Through the lever, the locking pin 5-4 retracts, completing the unlocking of the lowest section locking structure 5. After the remaining sections of the locking structure 5 descend, the lower end of the latch 5-3-1 presses against the surface of the pedal 3. The surface of the pedal 3 pushes against the latch 5-3-1, causing it to slide towards the locking groove 2-3, locking the latch 5-3-1 into the locking groove 2-3. At the same time, the latch 5-3 rotates through the lever principle, driving the locking pin 5-4. The locking pin 5-4 is pulled out of the fixing hole 1-1 of the ladder tube 1, breaking the self-locking of the ladder tube 1. The ladder tube 1 slides down, and the handrail 6-2 retracts synchronously with the descent of the ladder tube 1, completing the retraction of the single-column electric telescopic ladder.

[0034] Specific Implementation Example 2: Please refer to Figures 7-9The present application relates to a double-column electric telescopic ladder, which is composed of a pair of single-column electric telescopic ladders, and is different from the single-column electric telescopic ladder in the first embodiment in that one of the single-column electric telescopic ladders is not provided with the driving structure 4, and shares the bidirectional connecting piece 7-1 and the fixed rod 9-2 with the single-column electric telescopic ladder provided with the driving structure 4 on one side, and the rest structures are the same as those in the first embodiment.

[0035] Further, as shown in the further embodiment, Figures 8-9 a pair of the abutting plates 6-1 are connected in the form of mutual insertion, and a pair of the bottom plates 9-1 are connected in the form of mutual insertion, so as to prevent interference between the pair of the abutting plates 6-1 and between the pair of the bottom plates 9-1 when the pair of the single-column electric telescopic ladders are matched, and to enhance the connecting strength of the double-column electric telescopic ladder, improve the stability of the double-column electric telescopic ladder, and improve the safety of the operator using the double-column electric telescopic ladder.

Claims

1. A single-column electric telescopic ladder, characterized in that: It includes several ladder tubes (1), several sleeves (2), several pedals (3), a drive structure (4), a locking structure (5), a connector (7), a switch (8), and a base frame (9). The diameter of the ladder tubes (1) gradually decreases from bottom to top. Adjacent ladder tubes (1) are nested and slidably connected. The sleeves (2) are provided with an interface end and a sleeve hole end. The two ends of the pedals (3) are fixedly connected to the interface end of the sleeves (2) and the connector (7) respectively. The sleeve hole end of the sleeves (2) is fitted onto the ladder tubes (1). The ladder tubes (1) are connected to the sleeves (2). The locking structure (5) is provided with... Inside the interface end on the same side of the sleeve (2), the bottom of the ladder tube (1) is fixedly connected to the drive structure (4), the switch (8) is electrically connected to the drive structure (4), and the lower end of the bottom ladder tube (1) is fixedly connected to the base frame (9). The base frame (9) includes a base plate (9-1) and a pair of fixing rods (9-2). The base plate (9-1) is fixedly connected to the bottom ladder tube (1), and the lower ends of the pair of fixing rods (9-2) are fixedly connected to the upper end of the base plate (9-1). The connector (7) is provided with fixing holes, and the pair of fixing rods (9-2) pass through the fixing holes and are fixedly connected to the connector (7).

2. The single-column electric telescopic ladder according to claim 1, characterized in that: The sleeve (2) includes a double-sided sleeve (2-1) and a single-sided sleeve (2-2). The double-sided sleeve (2-1) has an interface end on both sides. The single-sided sleeve (2-2) has an interface end only on the side with the locking structure (5). The bottom ladder tube (1) is fixedly connected to the sleeve end of several double-sided sleeves (2-1). The top ladder tube (1) is fixedly connected to the sleeve end of a double-sided sleeve (2-1). The interface end of each double-sided sleeve (2-1) is fixedly connected to a pedal (3). The remaining ladder tubes (1) between the bottom ladder tube (1) and the top ladder tube (1) are alternately slidably connected to the double-sided sleeve (2-1) and the single-sided sleeve (2-2). The single-sided sleeve (2-2) and the double-sided sleeve (2-1) are alternately fixedly connected to a pedal (3), forming an alternating single-sided stepping area.

3. The single-column electric telescopic ladder according to claim 1, characterized in that: The locking structure (5) includes a spring sleeve (5-1), a spring (5-2), a latch (5-3), and a locking pin (5-4). The upper end of the sleeve hole of the tube sleeve (2) is provided with a locking groove (2-3), and the inner side is provided with a circular through hole. The spring sleeve (5-1) is fixedly connected to the tube sleeve (2). A spring groove is provided on one side of the spring sleeve (5-1), and the spring (5-2) is placed in the spring groove. One end of the spring (5-2) that contacts the bottom of the spring groove of the spring sleeve (5-1) is fixedly connected to the spring sleeve (5-1). One end of the locking pin (5-4) passes through the circular through hole provided in the tube sleeve (2), and the other end compresses the spring (5-2). In the spring groove of the spring sleeve (5-1), the locking pin (5-4) is slidably connected to the tube sleeve (2). The locking pin (5-4) has a snap-fit ​​part at the middle end. The lower end of the lock buckle (5-3) is inserted into both sides of the locking pin (5-4) and abuts against the snap-fit ​​part of the locking pin (5-4) near the circular through hole of the tube sleeve (2). The tube sleeve (2) is provided with a groove matching the lock buckle (5-3). The middle part of the lock buckle (5-3) is rotatably connected to the tube sleeve (2) at the groove and forms a lever structure with the tube sleeve (2). The rotating end of the lock buckle (5-3) is provided with a locking tongue (5-3-1), which is snapped into the locking groove (2-3).

4. A single-column electric telescopic ladder according to claim 1, characterized in that: Each ladder tube (1) has a fixing hole (1-1) on its inner side. When the fixing holes (1-1) of any two adjacent ladder tubes (1) move to the position of the locking pin (5-4) of each other, the locking pin (5-4) pops out and locks the two adjacent ladder tubes (1). The ladder tube (1) can then drive the next ladder tube (1) to extend and retract.

5. A single-column electric telescopic ladder according to claim 1, characterized in that: The drive structure (4) includes a motor (4-1) and a lead screw (4-2). The motor (4-1) is fixedly connected to the bottom of the bottom ladder tube (1). The motor (4-1) is a drive motor with a built-in reducer. The lead screw (4-2) includes a shaft part and a threaded part. The motor (4-1) is directly connected to one end of the shaft part of the lead screw (4-2). The ladder tube (1) also includes several nuts (1-2). The nuts (1-2) are installed at the lower end of the ladder tube (1). The threaded part of the lead screw (4-2) is threadedly connected to the nuts (1-2). The threaded part of the lead screw (4-2) can drive each ladder tube (1) to extend and retract vertically. The removable and rechargeable lithium battery (4-3) is installed below the switch (8).

6. A single-column electric telescopic ladder according to claim 1, characterized in that: It also includes an unlocking plate (6), which is fixedly connected to the tube sleeve (2) at the upper end of the base frame 9. The unlocking plate (6) includes a stop plate (6-1), a pair of unlocking springs (6-2) and a fixing bolt (6-3). The stop plate (6-1) has a pair of through holes. The stop plate (6-1) and the pair of unlocking springs (6-2) are respectively fitted onto the fixing bolt (6-3) and the fixing rod (9-2). The stop plate (6-1) is located below the unlocking springs (6-2). The fixing bolt (6-3) and the tube sleeve (2) are fixedly connected.

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