Single drive multi-stage telescopic device

Abstract

The present invention provides a single-drive multi-stage telescopic device, comprising a telescopic arm assembly, an electric drive assembly and a base; the telescopic arm assembly comprises a first-stage telescopic arm and a second-stage telescopic arm, wherein: the first-stage telescopic arm comprises a first sliding assembly, a first transmission assembly and a first telescopic arm plate, the first telescopic arm plate is mounted on the base via the first sliding assembly, and performs linear motion relative to the base under the drive of the electric drive assembly and the first transmission assembly; the second-stage telescopic arm comprises a second sliding assembly, a second transmission assembly and a second telescopic arm plate, the second telescopic arm plate is mounted on the first telescopic arm plate via the second sliding assembly, and performs linear motion relative to the first telescopic arm plate in the same direction under the drive of the first telescopic arm plate and the second transmission assembly. The present invention can effectively and significantly improve the transmission speed and transmission distance of items in a confined space; and the transmission distance can be accurately controlled during the transmission process.

Description

Technical Field

[0001] The invention relates to the field of telescopic mechanisms, and more particularly to a single-drive multi-stage telescopic device. Background Art

[0002] The existing telescopic mechanism has a complex design structure, a long telescopic arm structure, and occupies a large space, and it is impossible to scientifically and reasonably compress the space occupied by the telescopic arm. The telescopic length of the telescopic mechanism cannot be accurately determined during the telescopic process. In addition, the telescopic mechanism cannot increase or decrease in multiples at the same time, and can only be extended when the previous telescopic mechanism has completed its extension. The process of judging the distance from the telescopic target point by this telescopic mechanism is relatively slow. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a new single-drive multi-stage telescopic device to address a series of problems such as the complex structure of the telescopic mechanism and the inability to increase the transmission speed and transmission distance.

[0004] The technical solution of the present invention to solve the above technical problems is to provide a single-drive multi-stage telescopic device, comprising a telescopic arm assembly, an electric drive assembly and a base, and the telescopic arm assembly and the electric drive assembly are installed on the base; the telescopic arm assembly comprises a first-stage telescopic arm and a second-stage telescopic arm, and the second-stage telescopic arm is installed on the first-stage telescopic arm; wherein:

[0005] The first-stage telescopic arm includes a first sliding assembly, a first transmission assembly, and a first telescopic arm plate. The first telescopic arm plate is installed on the base via the first sliding assembly and performs linear motion relative to the base under the drive of the electric drive assembly and the first transmission assembly.

[0006] The second-stage telescopic arm includes a second sliding assembly, a second transmission assembly and a second telescopic arm plate. The second telescopic arm plate is installed on the first telescopic arm plate via the second sliding assembly, and performs linear motion in the same direction relative to the first telescopic arm plate under the drive of the first telescopic arm plate and the second transmission assembly.

[0007] In the single-drive multi-stage telescopic device described in the present invention, the electric drive component includes a drive motor and a drive gear driven to rotate by the drive motor; the first sliding component includes a first guide rail and a first slider slidably connected to the first guide rail, the first guide rail is fixed on the base, and the first slider is fixed on the first telescopic arm plate; the first transmission component includes a first rack, and the first rack is fixed to the first telescopic arm plate and meshes with the drive gear; the first rack causes the first slider to slide on the first guide rail when the drive gear rotates.

[0008] In the single-drive multi-stage telescopic device described in the present invention, the second sliding assembly includes a second guide rail arranged parallel to the first guide rail and a second slider slidably connected to the second guide rail, the second guide rail is fixed on the first telescopic arm plate, and the second slider is fixed on the second telescopic arm plate; the second transmission assembly includes a first driving gear, a first driven gear, a first pulley group, a fixed rack and a second rack, the fixed rack is fixed on the base, and the second rack is fixed on the second telescopic arm plate; the first driving gear and the first driven gear are respectively installed on the first telescopic arm plate, and the first driving gear is meshed on the fixed rack, and the first driven gear is meshed on the second rack; when the first telescopic arm plate makes a linear motion, the first driving gear rotates under the action of the fixed rack, and the first driven gear follows the rotation of the first driving gear through the transmission of the first pulley group, and drives the second rack to make the second slider slide on the second guide rail.

[0009] In the single-drive multi-stage telescopic device described in the present invention, the first pulley group includes a first main pulley, a first slave pulley and a first belt, and the first belt is wound around the first main pulley and the first slave pulley; the first driving gear and the first main pulley are respectively installed on both sides of the first telescopic arm plate through the first rotating shaft, and the first driven gear and the first slave pulley are respectively installed on both sides of the first telescopic arm plate through the second rotating shaft, and the first driving gear and the first driven gear are located on the same side of the first telescopic arm plate.

[0010] In the single-drive multi-stage telescopic device described in the present invention, a third-stage telescopic arm is also connected to the second-stage telescopic arm, and the third-stage telescopic arm includes a third sliding assembly, a third transmission assembly and a third telescopic arm plate. The third telescopic arm plate is installed on the second telescopic arm plate via the third sliding assembly, and performs linear motion in the same direction relative to the second telescopic arm plate under the drive of the second telescopic arm plate and the third transmission assembly.

[0011] In the single-drive multi-stage telescopic device described in the present invention, the third sliding assembly includes a third guide rail arranged in parallel with the first guide rail and the second guide rail and a third slider slidably connected to the third guide rail, the third guide rail is fixed on the second telescopic arm plate, and the third slider is fixed on the third telescopic arm plate; the third transmission assembly includes a second driving gear, a second driven gear, a second pulley group, a third rack and a fourth rack, the third rack is fixed on the first telescopic arm plate, and the fourth rack is fixed on the third telescopic arm plate; the second driving gear and the second driven gear are respectively installed on the second telescopic arm plate, and the first driving gear is meshed on the third rack, and the second driven gear is meshed on the fourth rack; when the second telescopic arm plate makes a linear motion, the second driving gear rotates under the action of the third rack, and the second driven gear follows the second driving gear to rotate through the second pulley group, and drives the fourth rack to make the third slider slide on the third guide rail.

[0012] In the single-drive multi-stage telescopic device described in the present invention, the second pulley group includes a second main pulley, a second slave pulley and a second belt, and the second belt is wound around the second main pulley and the second slave pulley; the second driving gear and the second main pulley are respectively installed on both sides of the second telescopic arm plate through the third rotating shaft, and the second driven gear and the second slave pulley are respectively installed on both sides of the second telescopic arm plate through the fourth rotating shaft, and the second driving gear and the second driven gear are located on the same side of the second telescopic arm plate.

[0013] In the single-drive multi-stage telescopic device described in the present invention, the base includes a bottom plate and a first mounting frame and a second mounting frame fixed on the bottom plate, the first mounting frame is located on the first side of the second mounting frame; the first mounting frame is L-shaped and the first mounting frame includes a horizontal plate and a vertical plate, the horizontal plate is fixed on the bottom plate, and the vertical plate is fixed on the edge of the horizontal plate; the drive motor is fixed on the vertical plate through the matching installation of the shaft and the shaft hole, and the shaft of the drive motor is parallel to the horizontal plate, and the drive gear shaft is installed at the free end of the shaft of the drive motor; the second mounting frame includes a first fixed plate and a tail fixed plate vertically arranged on the bottom plate, and the opposite surfaces of the first fixed plate and the tail fixed plate are arranged in parallel; the two ends of the first guide rail abut against the roots of the first fixed plate and the tail fixed plate; the two ends of the fixed rack are respectively fixed above the first fixed plate and the tail fixed plate.

[0014] In the single-drive multi-stage telescopic device described in the present invention, a first tensioning wheel is provided on the end surface of the first side of the first telescopic arm plate and / or a second tensioning wheel is provided on the end surface of the second side of the second telescopic arm plate; wherein the first tensioning wheel acts on the first belt, and the second tensioning wheel acts on the second belt.

[0015] In the single-drive multi-stage telescopic device described in the present invention, the outer edge surfaces of the first rack, the first telescopic arm plate and the first side of the third rack are aligned; the outer edge surfaces of the second telescopic arm plate and the second side of the second rack are aligned; the outer edge surfaces of the fourth rack and the first side of the third telescopic arm plate are aligned.

[0016] The single-drive multi-stage telescopic device of the present invention has the following beneficial effects: by driving the first telescopic arm plate and the second telescopic arm plate to run in the same direction by a single motor, rapid and long-distance transmission of objects can be achieved in a confined space, and the transmission distance can be accurately controlled during the object transmission process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is an exploded view of an embodiment of a single-drive multi-stage telescopic device of the present invention;

[0018] Figure 2 1 is a schematic diagram of a state of a single-drive multi-stage telescopic device embodiment of the present invention when not telescoped;

[0019] Figure 3 Schematic diagram of a first telescopic state of an embodiment of a single-drive multi-stage telescopic device of the present invention;

[0020] Figure 4 Schematic diagram of a second telescopic state of an embodiment of a single-drive multi-stage telescopic device of the present invention;

[0021] Figure 5 Schematic diagram of the third telescopic state of the single-drive multi-stage telescopic device embodiment of the present invention;

[0022] Figure 6 It is a schematic diagram of the state of the single-drive multi-stage telescopic device embodiment of the present invention at the end of telescopic operation.

[0023] Reference numerals include:

[0024] 10- driving motor 11- driving gear 21- first telescopic arm plate

[0025] 22- second telescopic arm plate 23- third telescopic arm plate 31- first sliding block

[0026] 32-first guide rail 33-second slider 34-second guide rail

[0027] 35-third slider 36-third guide rail 41-fixed rack

[0028] 42-first rack 43-second rack 44-third rack

[0029] 45- fourth rack 51- second driving gear 52- second driven gear

[0030] 61-first main pulley 62-first slave pulley 63-first belt

[0031] 64-second main pulley 65-second slave pulley 66-second belt DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0033] like Figure 1-6 The figure is a schematic diagram of an embodiment of a single-drive multi-stage telescopic device of the present invention, which can be used in occasions with narrow internal space such as vending machines and automatic book lending machines to transport items. The single-drive multi-stage telescopic device in this embodiment includes a telescopic arm assembly, an electric drive assembly and a base, and the telescopic arm assembly and the electric drive assembly are installed on the base; the telescopic arm assembly includes a first-stage telescopic arm and a second-stage telescopic arm, and the second-stage telescopic arm is connected to the first-stage telescopic arm; wherein:

[0034] The first-stage telescopic arm includes a first sliding assembly, a first transmission assembly, and a first telescopic arm plate 21. The first telescopic arm plate 21 is installed on the base via the first sliding assembly, and performs linear motion relative to the base under the drive of the electric drive assembly and the first transmission assembly.

[0035] The second-stage telescopic arm includes a second sliding assembly, a second transmission assembly, and a second telescopic arm plate 22. The second telescopic arm plate 22 is installed on the first telescopic arm plate 21 via the second sliding assembly, and performs linear motion in the same direction relative to the first telescopic arm plate 21 under the drive of the first telescopic arm plate 21 and the second transmission assembly. The single-drive multi-stage telescopic device in the present invention has a simple structure, the telescopic arm assembly occupies a small space, and is suitable for being set in a confined space; moreover, the present invention can effectively and significantly improve the transmission speed or transmission distance of the telescopic arm assembly in a confined space; during the telescopic process, the telescopic length of the telescopic arm assembly can be accurately set and realized, and the distance between the telescopic arm assembly and the target point can be quickly and accurately determined. For example, the single-drive multi-stage telescopic device in the present invention can be applied to vending machines.

[0036] Furthermore, the electric drive assembly includes a drive motor 10 and a drive gear 11 driven to rotate by the drive motor 10; the first sliding assembly includes a first guide rail 32 and a first slider 31 slidably connected to the first guide rail 32, the first guide rail 32 is fixed on the base, and the first slider 31 is fixed on the first telescopic arm plate 21; the first transmission assembly includes a first rack 42, and the first rack 42 is fixed to the first telescopic arm plate 21 and meshes with the drive gear 11; the first rack 42 makes the first slider 31 slide on the first guide rail 32 when the drive gear 11 rotates. Since the first slider 31 is fixed on the first telescopic arm plate 21, when the first slider 31 slides on the first guide rail 32, the first telescopic arm plate 21 slides on the first guide rail 32 at the same time. The single-drive multi-stage telescopic device in this embodiment has a simple structure, the arm length of the first telescopic arm plate 21 is relatively short and occupies a small space, which is convenient for transportation, and the subsequent maintenance is simple, convenient and fast.

[0037] Specifically, the second sliding assembly includes a second guide rail 34 arranged parallel to the first guide rail 32 and a second slider 33 slidably connected to the second guide rail 34, the second guide rail 34 is fixed on the first telescopic arm plate 21, and the second slider 33 is fixed on the second telescopic arm plate 22; the second transmission assembly includes a first driving gear (not shown in the figure), a first driven gear (not shown in the figure), a first pulley group, a fixed rack 41 and a second rack 43, the fixed rack 41 is fixed on the base, and the second rack 43 is fixed on the second telescopic arm The first driving gear and the first driven gear are respectively mounted on the first telescopic arm plate 21, and the first driving gear is meshed with the fixed rack 41, and the first driven gear is meshed with the second rack 43; when the first telescopic arm plate 21 makes a linear motion, the first driving gear rotates under the action of the fixed rack 41, and the first driven gear rotates with the first driving gear through the first pulley group, and drives the second rack 43 to make the second slider 33 slide on the second guide rail 34. Among them, when the second telescopic arm plate 22 is in the initial state, the first driving gear and the first driven gear are meshed on the fixed rack 41, and the first driving gear and the first driven gear are meshed on the second rack 43; when the second telescopic arm plate 22 is telescoped to the final state, the first driving gear is meshed on the fixed rack 41, and the first driven gear is meshed on the second rack 43; in the intermediate state, the first driven gear is disengaged from the fixed rack 41, and the first driven gear is only meshed on the second rack 43.

[0038] Correspondingly, the first pulley group includes a first main pulley, a first slave pulley and a first belt, and the first belt is wound around the first main pulley and the first slave pulley; the first driving gear and the first main pulley are respectively installed on both sides of the first telescopic arm plate through the first rotating shaft, and the first driven gear and the first slave pulley are respectively installed on both sides of the first telescopic arm plate through the second rotating shaft, and the first driving gear and the first driven gear are located on the same side of the first telescopic arm plate. In this embodiment, the transmission action of the first driving gear is synchronously transmitted to the first driven gear through the cooperation of the first main pulley 61, the first slave pulley 62 and the first belt 63. This principle is applied in the single-drive multi-stage telescopic device in this embodiment to enable the second transmission component to more effectively, accurately and simply control the telescopic length of the second telescopic component.

[0039] Preferably, the second-stage telescopic arm is also connected to a third-stage telescopic arm, which includes a third sliding assembly, a third transmission assembly and a third telescopic arm plate 23. The third telescopic arm plate 23 is installed on the second telescopic arm plate 22 via the third sliding assembly, and drives the second telescopic arm plate 22 and the third transmission assembly to make a linear motion in the same direction relative to the second telescopic arm plate 22.

[0040] The third sliding assembly in the aforementioned embodiment includes a third guide rail 36 arranged in parallel with the first guide rail 32 and the second guide rail 34 and a third slider 35 slidably connected to the third guide rail 36, the third guide rail 36 is fixed on the second telescopic arm plate 22, and the third slider 35 is fixed on the third telescopic arm plate 23; the third transmission assembly includes a second driving gear 51, a second driven gear 52, a second pulley set, a third rack 44 and a fourth rack 45, the third rack 44 is fixed on the first telescopic arm plate 21 (the third rack 44 is fixed on the upper surface of the second telescopic arm plate 22), and the fourth rack 45 It is fixed on the third telescopic arm plate 23 (the fourth rack 45 is fixed on the lower surface of the third telescopic arm plate 23); the second driving gear 51 and the second driven gear 52 are respectively installed on the second telescopic arm plate 22, and the first driving gear is meshed with the third rack 44, and the second driven gear 52 is meshed with the fourth rack 45; when the second telescopic arm plate 22 makes a linear motion, the second driving gear 51 rotates under the action of the third rack 44, and the second driven gear 52 rotates following the second driving gear 51 through the second pulley group, and drives the fourth rack 45 to make the third slider 35 slide on the third guide rail 36. Among them, when the third telescopic arm plate 23 is in the initial state, the second driving gear 51 and the second driven gear 52 are meshed on the third rack 44, and the second driving gear 51 and the second driven gear 52 are meshed on the fourth rack 45; when the third telescopic arm plate 23 is extended and retracted to the final state, the second driving gear 51 is meshed on the third rack 44, and the second driven gear 52 is meshed on the fourth rack 45; in the intermediate state, the second driven gear 52 is disengaged from the third rack 44, and the second driven gear 52 is only meshed on the fourth rack 45.

[0041] The second pulley group in the above-mentioned embodiment includes a second main pulley 64, a second slave pulley 65 and a second belt 66, and the second belt 66 is wound around the second main pulley 64 and the second slave pulley 65; the second driving gear 51 and the second main pulley 64 are respectively mounted on both sides of the second telescopic arm plate 22 through the third rotating shaft, and the second driven gear 52 and the second slave pulley 65 are respectively mounted on both sides of the second telescopic arm plate 22 through the fourth rotating shaft, and the second driving gear 51 and the second driven gear 52 are located on the same side of the second telescopic arm plate 22. In this embodiment, the transmission action of the second driving gear 51 is synchronously transmitted to the second driven gear 52 through the cooperation of the second main pulley 64, the second slave pulley 65 and the second belt 66. This principle is applied in the single-drive multi-stage telescopic device in this embodiment to enable the third transmission assembly to more effectively, accurately and simply control the telescopic length of the third telescopic assembly.

[0042] The base in the above embodiment includes a bottom plate and a first mounting frame and a second mounting frame fixed on the bottom plate, the first mounting frame is located on the first side of the second mounting frame; the first mounting frame is L-shaped and includes a horizontal plate and a vertical plate, the horizontal plate is fixed on the bottom plate, and the vertical plate is fixed on the edge of the horizontal plate; the drive motor 10 is fixed on the vertical plate through the matching installation of the shaft and the shaft hole, and the shaft of the drive motor 10 is parallel to the horizontal plate, and the drive gear 11 shaft is installed on the free end of the shaft of the drive motor 10; the second mounting frame includes a first fixed plate and a tail fixed plate vertically arranged on the bottom plate, and the opposite surfaces of the first fixed plate and the tail fixed plate are arranged in parallel; the two ends of the first guide rail 32 abut against the roots of the first fixed plate and the tail fixed plate; the two ends of the fixed rack 41 are respectively fixed above the first fixed plate and the tail fixed plate. The single-drive multi-stage telescopic device in the present invention can be used on large operating platforms for material supply, and can also be used on small and medium-sized equipment for cargo supply. Specifically, the bottom plate in this embodiment can be fixed on large operating platforms such as fire trucks, drilling and construction, and the bottom plate can also be fixed to the corresponding position on small and medium-sized equipment (for example, in a vending machine or warehouse automatic storage and retrieval equipment to achieve item grabbing or transportation). In addition, the drive motor 10 is connected to the equipment at the control end and the monitoring end, which is more conducive to the telescopic state control of the single-drive multi-stage telescopic device.

[0043] The first belt 63 and the second belt 66 in the above embodiment may lose elasticity during long-term telescopic process. In order to prevent the first belt 63 and the second belt 66 from losing elasticity and affecting the effect of synchronous transmission, a first tensioning wheel is provided on the end face of the first side of the first telescopic arm plate 21 (the side of the telescopic assembly where the drive motor 10 is the first side) and / or a second tensioning wheel is provided on the end face of the second side of the second telescopic arm plate 22; wherein the first tensioning wheel acts on the first belt 63, and the second tensioning wheel acts on the second belt 66.

[0044] In addition, in order to facilitate the transmission action of the first pulley group, the second pulley group, the first driving gear and the first driven gear, the second driving gear 51 and the second driven gear 52, the outer edge surfaces of the first side of the first rack 42, the first telescopic arm plate 21 and the third rack 44 are aligned; the outer edge surfaces of the second side of the second telescopic arm plate 22 and the second rack 43 are aligned; the outer edge surfaces of the first side of the fourth rack 45 and the third telescopic arm plate 23 are aligned.

[0045] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A single-drive multi-stage telescopic device, characterized in that , applied to an automatic vending machine or an automatic book lending machine, the single-drive multi-stage telescopic device comprises a telescopic arm assembly, an electric drive assembly and a base, and the telescopic arm assembly and the electric drive assembly are mounted on the base; the telescopic arm assembly comprises a first-stage telescopic arm and a second-stage telescopic arm, and the second-stage telescopic arm is mounted on the first-stage telescopic arm; wherein: The first-stage telescopic arm includes a first sliding assembly, a first transmission assembly, and a first telescopic arm plate. The first telescopic arm plate is installed on the base via the first sliding assembly and performs linear motion relative to the base under the drive of the electric drive assembly and the first transmission assembly. The second-stage telescopic arm comprises a second sliding assembly, a second transmission assembly and a second telescopic arm plate, wherein the second telescopic arm plate is mounted on the first telescopic arm plate via the second sliding assembly and performs linear motion in the same direction relative to the first telescopic arm plate under the drive of the first telescopic arm plate and the second transmission assembly; The electric drive assembly includes a drive motor and a drive gear driven to rotate by the drive motor; the first sliding assembly includes a first guide rail and a first slider slidably connected to the first guide rail, the first guide rail is fixed on the base, and the first slider is fixed on the first telescopic arm plate; the first transmission assembly includes a first rack, and the first rack is fixed to the first telescopic arm plate and meshes with the drive gear; the first rack enables the first slider to slide on the first guide rail when the drive gear rotates; The second sliding assembly includes a second guide rail arranged parallel to the first guide rail and a second slider slidably connected to the second guide rail, the second guide rail is fixed on the first telescopic arm plate, and the second slider is fixed on the second telescopic arm plate; the second transmission assembly includes a first driving gear, a first driven gear, a first pulley group, a fixed rack and a second rack, the fixed rack is fixed on the base, and the second rack is fixed on the second telescopic arm plate; the first driving gear and the first driven gear are respectively installed on the first telescopic arm plate, and the first driving gear is meshed on the fixed rack, and the first driven gear is meshed on the second rack; when the first telescopic arm plate makes a linear motion, the first driving gear rotates under the action of the fixed rack, and the first driven gear rotates following the first driving gear through the transmission of the first pulley group, and drives the second rack to make the second slider slide on the second guide rail; When the second telescopic arm plate is in the initial state, the first driving gear and the first driven gear are meshed on the fixed rack, and the first driving gear and the first driven gear are meshed on the second rack; when the second telescopic arm plate is extended to the final state, the first driving gear is meshed on the fixed rack, and the first driven gear is meshed on the second rack; in the intermediate state, the first driven gear is disengaged from the fixed rack, and the first driven gear is only meshed on the second rack.

2. The single-drive multi-stage telescopic device according to claim 1, characterized in that: The first pulley group includes a first main pulley, a first slave pulley and a first belt, and the first belt is wound around the first main pulley and the first slave pulley; the first driving gear and the first main pulley are respectively installed on both sides of the first telescopic arm plate through a first rotating shaft, and the first driven gear and the first slave pulley are respectively installed on both sides of the first telescopic arm plate through a second rotating shaft, and the first driving gear and the first driven gear are located on the same side of the first telescopic arm plate.

3. The single-drive multi-stage telescopic device according to claim 2, characterized in that: The second-stage telescopic arm is also connected to a third-stage telescopic arm, and the third-stage telescopic arm includes a third sliding assembly, a third transmission assembly, and a third telescopic arm plate. The third telescopic arm plate is mounted on the second telescopic arm plate via the third sliding assembly, and drives the second telescopic arm plate and the third transmission assembly to make a linear motion in the same direction relative to the second telescopic arm plate.

4. The single-drive multi-stage telescopic device according to claim 3, characterized in that: The third sliding assembly includes a third guide rail arranged in parallel with the first guide rail and the second guide rail and a third slider slidably connected to the third guide rail, the third guide rail is fixedly arranged on the second telescopic arm plate, and the third slider is fixedly arranged on the third telescopic arm plate; the third transmission assembly includes a second driving gear, a second driven gear, a second pulley group, a third rack and a fourth rack, the third rack is fixedly arranged on the first telescopic arm plate, and the fourth rack is fixedly arranged on the third telescopic arm plate; the second driving gear and the second driven gear are respectively installed on the second telescopic arm plate, and the first driving gear is meshed on the third rack, and the second driven gear is meshed on the fourth rack; when the second telescopic arm plate makes a linear motion, the second driving gear rotates under the action of the third rack, and the second driven gear follows the second driving gear to rotate through the transmission of the second pulley group, and drives the fourth rack to make the third slider slide on the third guide rail.

5. The single-drive multi-stage telescopic device according to claim 4, characterized in that: The second pulley group includes a second main pulley, a second slave pulley and a second belt, the second belt is wound around the second main pulley and the second slave pulley; the second driving gear and the second main pulley are respectively installed on both sides of the second telescopic arm plate through the third rotating shaft, the second driven gear and the second slave pulley are respectively installed on both sides of the second telescopic arm plate through the fourth rotating shaft, and the second driving gear and the second driven gear are located on the same side of the second telescopic arm plate.

6. The single-drive multi-stage telescopic device according to claim 5, characterized in that: The base includes a bottom plate and a first mounting frame and a second mounting frame fixed on the bottom plate, the first mounting frame is located on a first side of the second mounting frame; the first mounting frame is L-shaped and the first mounting frame includes a horizontal plate and a vertical plate, the horizontal plate is fixed on the bottom plate, and the vertical plate is fixed on the edge of the horizontal plate; the drive motor is fixed to the vertical plate by the matching installation of the shaft and the shaft hole, and the shaft of the drive motor is parallel to the horizontal plate, and the drive gear shaft is installed at the free end of the shaft of the drive motor; the second mounting frame includes a first fixed plate and a tail fixed plate vertically arranged on the bottom plate, and the opposite surfaces of the first fixed plate and the tail fixed plate are arranged in parallel; the two ends of the first guide rail abut against the roots of the first fixed plate and the tail fixed plate; the two ends of the fixed rack are respectively fixed above the first fixed plate and the tail fixed plate.

7. The single-drive multi-stage telescopic device according to claim 6, characterized in that: A first tensioning wheel is provided on the end surface of the first side of the first telescopic arm plate and / or a second tensioning wheel is provided on the end surface of the second side of the second telescopic arm plate; wherein the first tensioning wheel acts on the first belt, and the second tensioning wheel acts on the second belt.

8. The single-drive multi-stage telescopic device according to claim 7, characterized in that: The outer edges of the first rack, the first telescopic arm plate and the first side of the third rack are aligned; the outer edges of the second side of the second telescopic arm plate and the second rack are aligned; the outer edges of the first side of the fourth rack and the third telescopic arm plate are aligned.

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