Large-range height adjusting device

Abstract

The utility model provides a large-range height adjusting device. The large-range height adjusting device comprises a fixed cylinder, an N-stage movable cylinder, a driving assembly and a power transmission assembly. The fixed cylinder is sequentially connected with the movable cylinders in a nested manner; the driving assembly is used for driving the first-stage movable cylinder to do lifting motion relative to the fixed cylinder; the power transmission assembly is used for transmitting the lifting motion of any stage of movable cylinder to the next stage of movable cylinder so as to drive the next stage of movable cylinder to ascend and descend along with the movable cylinder. Wherein N is a natural number, and N is greater than or equal to 2; according to the lifting device, the position of the first-stage movable barrel is adjusted only through the driving assembly, the lifting motion of any stage of movable barrel can be transmitted to the next stage of movable barrel through the power transmission assembly, follow-up lifting of all stages of movable barrels is achieved, the adjusting difficulty is lowered, and cost is saved.

Description

Technical Field

[0001] This utility model relates to the field of vertical lifting technology, and in particular to a device for adjusting height over a wide range. Background Technology

[0002] In daily life, industrial manufacturing, equipment maintenance, logistics services and other fields, it is often necessary to install height adjustment devices to raise or lower the target object to the required height to meet the needs of use or processing.

[0003] For example, the utility model patent with application number CN2023222291193 discloses a height-adjustable base and a robot. The height-adjustable base has a drive component between two adjacent boxes to achieve individual lifting of each box, thereby achieving the purpose of large-range height adjustment of the robot. However, the height-adjustable base requires individual adjustment of each drive component, which is inconvenient. Utility Model Content

[0004] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a wide range of height adjustment device, which has the advantages of convenient adjustment and low cost.

[0005] To achieve the above objectives, this utility model provides a wide-range height adjustment device, including a fixed cylinder, N-stage movable cylinders, a drive assembly, and a power transmission assembly; the fixed cylinder and each stage of movable cylinders are nested together sequentially; the drive assembly drives the first-stage movable cylinder to move up and down relative to the fixed cylinder; the power transmission assembly transmits the up and down movement of any stage of movable cylinder to the next stage of movable cylinder, so as to drive the next stage of movable cylinder to move up and down accordingly; wherein, N is a natural number, and N≥2; the drive assembly includes a drive belt, a first support wheel, a take-up wheel, and a drive source for driving the take-up wheel; the first support wheel is located at the lower middle of the first-stage movable cylinder; one end of the drive belt is connected to the take-up wheel on the fixed cylinder, and the other end of the drive belt passes around the first support wheel and is connected to the side wall of the first-stage movable cylinder away from the take-up wheel.

[0006] Preferably, the power transmission assembly includes a driven belt; one end of the driven belt is connected to the j-th stage movable cylinder or a fixed cylinder via the i-th stage movable cylinder, and the other end of the driven belt is connected to the (i+1)-th stage movable cylinder, so as to drive the (i+1)-th stage movable cylinder to follow the i-th stage movable cylinder; wherein i and j are natural numbers, and 1≤i≤N-1, j <i。

[0007] Preferably, the fixed cylinder and each level of movable cylinder are slidably nested from the outside to the inside; a second support wheel is provided in the middle of the (i+1)th level movable cylinder; one end of the driven belt passes through the i-th level movable cylinder and is connected to the j-th level movable cylinder or the fixed cylinder, and the other end of the driven belt passes around the second support wheel of the (i+1)th level movable cylinder and is connected to the (i+1)th level movable cylinder; the two ends of the driven belt are respectively located on different sides of the corresponding second support wheel.

[0008] Preferably, each of the movable cylinders has a side opening, and the second support wheel is mounted at the side opening of the corresponding movable cylinder.

[0009] Preferably, the i-th stage movable cylinder is provided with a guide pulley for supporting the corresponding driven belt.

[0010] Preferably, the power transmission assembly includes a gear transmission structure located on the first and kth stage movable cylinders, a driven rack located on the (k+1)th stage movable cylinder, and a driving rack located on the fixed cylinder and the (k-1)th stage movable cylinder; the gear transmission structure includes a driving gear, a driven gear, and an intermediate transmission component that enables the driving gear and the driven gear to rotate synchronously; the driven gear on the kth stage movable cylinder meshes with the driven rack on the (k+1)th stage movable cylinder; the driving rack on the (k-1)th stage movable cylinder meshes with the driving gear on the kth stage movable cylinder, and the driving rack on the fixed cylinder meshes with the driving gear on the first stage movable cylinder; wherein, k is a natural number, and 2≤k≤N-1.

[0011] Preferably, the intermediate transmission component includes a first pulley coaxially arranged with the driving gear, a second pulley coaxially arranged with the driven gear, and a transmission belt or transmission chain wound around the first pulley and the second pulley.

[0012] Preferably, the two adjacent movable cylinders are slidably connected by a guide mechanism, and the first-stage movable cylinder and the fixed cylinder are slidably connected by a guide mechanism.

[0013] Preferably, the guiding mechanism includes a vertical slide rail and a slider slidably disposed on the vertical slide rail.

[0014] As described above, the wide-range height adjustment device of this utility model has the following beneficial effects:

[0015] The wide-range height adjustment device of this application adopts a multi-level nested structure. It uses a drive component to drive the first-level movable cylinder to move up and down, and uses a power transmission component to transmit power to the subsequent movable cylinders, so that the subsequent movable cylinders move up and down synchronously with the first-level movable cylinder. In the entire adjustment process, only one power is needed to achieve a wide range of height adjustment. It has the advantages of convenient adjustment and low cost, and has good application prospects. Attached Figure Description

[0016] Figure 1This is a perspective view of the large-range height adjustment device in the retracted state according to an embodiment of this application.

[0017] Figure 2 for Figure 1 3D exploded view.

[0018] Figure 3 for Figure 1 The front view of the large-scale height adjustment device involved in the middle in its unfolded state.

[0019] Figure 4 This is a schematic diagram of the structure in which the second support wheel is mounted on the movable cylinder.

[0020] Figure 5 This is a front view of a large-range height adjustment device in another embodiment of this application.

[0021] Figure 6 for Figure 5 Schematic diagram of the power transmission principle of the power transmission component.

[0022] Explanation of reference numerals in the attached figures:

[0023] Fixed cylinder 1, movable cylinder 2, first upright plate 21, second upright plate 22, side opening 23, drive assembly 3, drive belt 31, first support wheel 32, take-up wheel 33, drive source 34, power transmission assembly 4, driven belt 41, second support wheel 42, guide pulley 43, drive rack 44, drive gear 45a, driven gear 45b, transmission belt 46, driven rack 47, guide mechanism 5, vertical slide rail 51, slider 52. Detailed Implementation

[0024] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0025] It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the scope of this invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of this invention, should still fall within the scope of the disclosed technical content. Furthermore, the terms "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0026] The large-range height adjustment device provided by this application can be applied to various technical fields involving height adjustment such as equipment maintenance and logistics services, and there is no limitation in this regard.

[0027] For the convenience of description, in the following embodiments, the height direction (i.e., the telescopic direction) of the large-range height adjustment device is defined as the up-and-down direction, the length direction of the large-range height adjustment device is defined as the left-and-right direction, and the width direction of the large-range height adjustment device is defined as the front-and-back direction. Based on this, in Figure 1 it, the x-direction is the front direction of the large-range height adjustment device, the y-direction is the left direction of the large-range height adjustment device, and the z-direction is the up direction of the large-range height adjustment device.

[0028] Embodiment 1

[0029] As Figures 1 to 3 shown, the large-range height adjustment device provided by this embodiment includes a fixed cylinder 1, N nested and connected movable cylinders 2 arranged in sequence from bottom to top, a driving component 3, and a power transmission component 4, where N is a natural number and N≥2; among them, the fixed cylinder 1 is located at the bottom and is nested and connected with the lowermost movable cylinder 2; for the convenience of description, in this embodiment, the lowermost movable cylinder 2 is defined as the first-stage movable cylinder, and the uppermost movable cylinder 2 is defined as the N-stage movable cylinder; the driving component 3 is used to drive the first-stage movable cylinder to move up and down relative to the fixed cylinder 1; the power transmission component 4 is used to transmit the up-and-down movement of any stage of the movable cylinder to the next stage of the movable cylinder to drive the next stage of the movable cylinder to move up and down following it.

[0030] It should be noted that the N-stage movable cylinder is a gradually shrinking structure or a gradually increasing structure, and there is no limitation in this regard; in this embodiment. The N-stage movable cylinder preferably adopts a gradually shrinking structure as Figure 1 shown (that is, among two adjacent stages of movable cylinders, the upper movable cylinder 2 is slidably arranged inside the lower movable cylinder 2). At this time, the first-stage movable cylinder is the outermost movable cylinder, and the N-stage movable cylinder is the innermost movable cylinder. In order to facilitate reducing the occupied space of the large-range height adjustment device in the contracted state, the fixed cylinder 1 is preferably slidably arranged outside the first-stage movable cylinder.

[0031] In the above large-range height adjustment device, the preferred structure of the power transmission component 4 is as Figures 1 to 3 shown. The power transmission component 4 includes a driven belt 41; among them, one end of the driven belt 41 passes through the i-stage movable cylinder and is connected to the j-stage movable cylinder or the fixed cylinder 1, and the other end of the driven belt 41 is connected to the i + 1-stage movable cylinder to drive the i + 1-stage movable cylinder to move following the i-stage movable cylinder; where i and j are natural numbers, and 1≤i≤N - 1, j < i; at this time, the i-stage movable cylinder supports and guides the passing driven belt 41.

[0032] It should be noted that the driven belt 41 can either directly bypass the top of the i-th stage movable cylinder or have a bypass hole made on the side wall of the i-th stage movable cylinder for the driven belt 41 to pass through; there is no limitation on this. In order to reduce the installation difficulty of the driven belt 41, the driven belt 41 is preferably directly bypassed by the top of the i-th stage movable cylinder.

[0033] In a preferred embodiment, such as Figure 1 , Figure 2 and Figure 4 As shown, the top of the i-th stage movable cylinder is provided with a guide pulley 43 for the corresponding driven belt 41 to pass around; the guide pulley 43 can effectively reduce the friction between the driven belt 41 and the movable cylinder being passed around, reduce the wear of the driven belt 41 during the movement process, and thus improve the service life of the driven belt 41.

[0034] In a further embodiment, such as Figures 1 to 3 As shown, a second support wheel 42 is provided in the middle of the (i+1)th stage movable cylinder; one end of the driven belt 41 passes around the i-th stage movable cylinder and connects to the j-th stage movable cylinder or the fixed cylinder 1, and the other end of the driven belt 41 passes around the second support wheel 42 of the (i+1)th stage movable cylinder and connects to the (i+1)th stage movable cylinder; wherein, the two ends of the driven belt 41 are respectively located on different sides of the corresponding second support wheel 41, so that the horizontal components of the tension force on both sides of the second support wheel 41 are offset as much as possible, avoiding the movable cylinder 2 from tilting during the lifting and lowering process, and ensuring the stability of the movable cylinder 2 during lifting and lowering. In this embodiment, the end of the driven belt 41 that passes around the 1st stage movable cylinder is preferably connected to the fixed cylinder 1, and the end of the driven belt 41 that passes around the i-th stage movable cylinder is preferably connected to the (i-1)th stage movable cylinder. This not only reduces the cost of the driven belt 41, but also avoids the driven belts 41 from tangling with each other, which would affect the use.

[0035] This embodiment solves the technical problem of the movable cylinder 2 easily tilting under the drag of a single driven belt simply by adding a second support wheel 42, with minimal impact on the overall cost. Furthermore, the addition of the second support wheel 42 does not increase the overall structural size of the large-range height adjustment device, offering advantages such as a compact structure and small footprint.

[0036] In a preferred embodiment, such as Figure 3 and Figure 4 As shown, in order to reduce the installation difficulty of the second support wheel 41, the i-th stage movable cylinder adopts a movable cylinder structure with a side opening 23 on the front side, and the second support wheel 41 is installed at the side opening 23 of the corresponding movable cylinder.

[0037] Specifically, a movable cylinder with a side opening 23, such as Figure 4As shown, it includes a second vertical plate 22 and first vertical plates 21 located on the left and right sides of the second vertical plate 22, and the vertical plates enclose each other to form a groove-shaped structure with side openings 23; the second support wheel 41 can be directly installed in the lower middle part of the second vertical plate 22, or it can be set on the lower connecting plate between the two first vertical plates 21. There is no limitation on this, as long as the lower end of the second support wheel 41 is not lower than the bottom end of the corresponding movable cylinder.

[0038] In the aforementioned wide-range height adjustment device, the preferred structure of the drive component 3 is as follows: Figures 1 to 3 As shown, it includes an active belt 31, a first support wheel 32, a take-up wheel 33, and a drive source 34 for driving the take-up wheel 33. The first support wheel 32 is rotatably disposed at the lower middle of the first-stage movable cylinder. One end of the active belt 31 is connected to the take-up wheel 33 on the first-stage movable cylinder, and the other end of the active belt 31 passes around the first support wheel 32 and is connected to the side wall of the first-stage movable cylinder away from the take-up wheel 33. Thus, when the drive source drives the take-up wheel 33 to rotate to retract the active belt 31, the shortened active belt 31 will push the first support wheel 32 upward, thereby causing the first-stage movable cylinder to move upward. When the drive source 34 drives the take-up wheel 33 to rotate to release the active belt 31, the first-stage movable cylinder will move downward under its own weight until the active belt 31 is taut. In this embodiment, the drive source 34 is a rotary motor or a rocker arm.

[0039] Of course, in order to reduce the installation difficulty of the first support wheel 32 and the active belt 31, the structure of the fixed cylinder 1 is preferably consistent with the structure of each level of movable cylinder, which will not be elaborated here.

[0040] In addition, the drive assembly 3 may also be other lifting drive devices such as electric push rods, pneumatic cylinders, or hydraulic cylinders, and there are no restrictions on this.

[0041] It should be noted that the driven belt 41 and the driving belt 31 involved in the above-mentioned large-range height adjustment device can be any rope or belt structure that can be bent arbitrarily and realize power transmission, such as rope, belt, strap or chain, and there is no limitation thereto; in this embodiment, the driven belt 41 and the driving belt 31 are preferably rubber belts.

[0042] In an alternative embodiment, such as Figure 2 As shown, adjacent movable cylinders 2 are slidably connected by a guide mechanism 5, and the first movable cylinder and the fixed cylinder 1 are slidably connected by the guide mechanism 5 to ensure sliding stability.

[0043] Specifically, such as Figure 1 and Figure 2As shown, the guiding mechanism 5 includes a vertical slide rail 51 and a slider 52 slidably mounted on the vertical slide rail 51; wherein, the vertical slide rail 51 is disposed on the inner surface of the outer movable cylinder, and the corresponding slider 52 is disposed on the outer surface of the adjacent inner movable cylinder, so as to achieve stable sliding between two adjacent movable cylinders 2; the vertical slide rail 51 is disposed on the inner surface of the fixed cylinder, and the corresponding slider 52 is disposed on the outer surface of the first movable cylinder, so as to achieve stable sliding of the first movable cylinder.

[0044] It should be noted that the vertical slide rail 51 needs to be set on the vertical plate of the corresponding movable cylinder and fixed cylinder 1, and the number of sets can be determined according to the actual situation, and there is no limitation thereto; in this embodiment, the vertical slide rail 51 needs to be symmetrically set on the two first vertical plates 21 of the corresponding movable cylinder and fixed cylinder to ensure sliding stability.

[0045] It should be noted that the number of nested levels of the movable cylinders involved in the large-range height adjustment device can be set as needed and is not limited thereto. For ease of understanding, the following description uses a two-level nested movable cylinder as an example to illustrate the operation of the large-range height adjustment device involved in this embodiment:

[0046] like Figures 1 to 3 As shown, when an increase in height is required, the take-up pulley 33 is simply driven to rotate by the drive source 34 to wind up the drive belt 31. During this process, the drive belt 31 will lift the first support pulley 32 upward, causing the first-stage movable cylinder to move upward. Furthermore, since the length of the driven belt 41 wound on the first-stage movable cylinder is fixed (i.e., the length of the first driven belt is fixed), when the first-stage movable cylinder moves upward, the length of the first driven belt between the first-stage movable cylinder and the fixed cylinder 1 increases, while the length of the first driven belt between the first-stage movable cylinder and the second-stage movable cylinder decreases, thereby causing the second-stage movable cylinder to move upward along with the first-stage movable cylinder.

[0047] When a reduction in height is required, simply drive the take-up pulley 33 via the drive source 34 to release the drive belt 31. During this process, the drive belt 31 gradually loosens, and the first support pulley 32 and the first-stage movable cylinder move downwards relative to the fixed cylinder under the influence of gravity. Furthermore, since the length of the drive belt 31 wound on the first-stage movable cylinder is fixed (i.e., the length of the first driven belt is fixed), when the first-stage movable cylinder moves downwards relative to the fixed cylinder 1, the first driven belt will loosen due to the lack of support from the first-stage movable cylinder. At this time, the second-stage movable cylinder will move downwards under its own weight to tighten the first driven belt, thus completing the height adjustment.

[0048] Example 2

[0049] The only difference between this embodiment and Embodiment 1 is the structure of the power transmission component. For example... Figure 5 and Figure 6As shown, the power transmission assembly includes a gear transmission structure located on the first and kth stage movable cylinders, a driven rack 47 located on the (k+1)th stage movable cylinder, and a driving rack 44 located on the fixed cylinder 1 and the (k-1)th stage movable cylinder. The gear transmission structure includes a driving gear 45a, a driven gear 45b, and an intermediate transmission component that synchronizes the rotation of the driving gear 45a and the driven gear 45b. The driven gear 45b on the kth stage movable cylinder meshes with the driven rack 47 on the (k+1)th stage movable cylinder; the driving rack 44 on the (k-1)th stage movable cylinder meshes with the driving gear 45a on the kth stage movable cylinder; and the driving rack 44 on the fixed cylinder 1 meshes with the driving gear 45a on the first stage movable cylinder. Here, k is a natural number, and 2 ≤ k ≤ N-1.

[0050] Specifically, the intermediate transmission component includes a first pulley coaxially arranged with the driving gear 45a, a second pulley coaxially arranged with the driven gear 45b, and a transmission belt 46 or transmission chain wound around the first pulley and the second pulley. Of course, the intermediate transmission component can also be a multi-stage gear transmission assembly arranged between the driving gear 45a and the driven gear 45b. There is no limitation on this, as long as the driving gear 45a and the driven gear 45b can rotate synchronously and in the same direction.

[0051] It should be noted that the number of nested levels of the movable cylinders involved in the wide-range height adjustment device can be set as needed and is not limited thereto. For ease of understanding, the following description uses a 3-level nested movable cylinder as an example to illustrate the operation of the wide-range height adjustment device involved in this embodiment:

[0052] When the first-stage moving cylinder moves upward under the action of the drive component, as Figure 5 As shown, the driving gear 45a on the first-stage movable cylinder rolls upward along the driving rack 44 on the inner wall of the fixed cylinder 1. During this process, the driving gear 45a on the first-stage movable cylinder rotates counterclockwise, and drives the driven gear 45a on the first-stage movable cylinder to rotate counterclockwise synchronously through the intermediate transmission component. Since the driven gear 45b on the first-stage movable cylinder meshes with the driven rack 47 on the second-stage movable cylinder, the driven rack 47 on the second-stage movable cylinder moves upward together with the second-stage movable cylinder. At this time, The driving gear 45a on the second-stage movable cylinder rolls upward along the driving rack 44 on the other side of the first-stage movable cylinder. In other words, the driving gear 45a on the second-stage movable cylinder rotates clockwise and drives the driven gear 45b on the second-stage movable cylinder to rotate clockwise synchronously through the intermediate transmission component. Since the driven gear 45b on the second-stage movable cylinder meshes with the driven rack 47 on the third-stage movable cylinder, the driven rack 47 on the third-stage movable cylinder moves upward together with the third-stage movable cylinder to complete the height adjustment.

[0053] When the first-stage moving cylinder moves downward under the action of the drive assembly, as Figure 5As shown, the driving gear 45a on the first-stage movable cylinder rolls downwards along the driving rack 44 on the inner wall of the fixed cylinder 1. During this process, the driving gear 45a on the first-stage movable cylinder rotates clockwise, and drives the driven gear 45a on the first-stage movable cylinder to rotate clockwise synchronously through the intermediate transmission component. Since the driven gear 45b on the first-stage movable cylinder meshes with the driven rack 47 on the second-stage movable cylinder, the driven rack 47 on the second-stage movable cylinder moves downwards together with the second-stage movable cylinder. At this time, The driving gear 45a on the second-stage movable cylinder rolls downward along the driving rack 44 on the other side of the first-stage movable cylinder. In other words, the driving gear 45a on the second-stage movable cylinder rotates counterclockwise and drives the driven gear 45b on the second-stage movable cylinder to rotate counterclockwise synchronously through the intermediate transmission component. Since the driven gear 45b on the second-stage movable cylinder meshes with the driven rack 47 on the third-stage movable cylinder, the driven rack 47 on the third-stage movable cylinder moves downward together with the third-stage movable cylinder to complete the height adjustment.

[0054] In summary, this utility model effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0055] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A wide-range height adjustment device, characterized in that, It includes a fixed cylinder (1), N-stage movable cylinders (2), a drive assembly (3), and a power transmission assembly (4); the fixed cylinder (1) and each stage of movable cylinders (2) are nested together in sequence; the drive assembly (3) is used to drive the first stage movable cylinder to move up and down relative to the fixed cylinder (1); The power transmission component (4) is used to transmit the lifting motion of any first-stage movable cylinder to the next-stage movable cylinder, so as to drive the next-stage movable cylinder to lift and lower accordingly; wherein, N is a natural number and N≥2; the drive component (3) includes a drive belt (31), a first support wheel (32), a take-up wheel (33) and a drive source (34) for driving the take-up wheel (33); the first support wheel (32) is located at the lower middle of the first-stage movable cylinder; one end of the drive belt (31) is connected to the take-up wheel (33) on the fixed cylinder (1), and the other end of the drive belt (31) passes around the first support wheel (32) and is connected to the side wall of the first-stage movable cylinder away from the take-up wheel (33).

2. The wide-range height adjustment device according to claim 1, characterized in that, The power transmission assembly (4) includes a driven belt (41); one end of the driven belt (41) is connected to the j-th stage movable cylinder or fixed cylinder (1) via the i-th stage movable cylinder, and the other end of the driven belt (41) is connected to the (i+1)-th stage movable cylinder to drive the (i+1)-th stage movable cylinder to follow the i-th stage movable cylinder; where i and j are natural numbers, and 1≤i≤N-1, j <i。 3. The wide-range height adjustment device according to claim 2, characterized in that, The fixed cylinder (1) and each level of movable cylinder are slidably nested from the outside to the inside; the middle of the (i+1)th level movable cylinder is provided with a second support wheel (42); one end of the driven belt (41) is connected to the jth level movable cylinder or the fixed cylinder (1) through the i-th level movable cylinder, and the other end of the driven belt (41) is connected to the i+1th level movable cylinder by passing around the second support wheel (42) of the (i+1)th level movable cylinder; the two ends of the driven belt (41) are located on different sides of the corresponding second support wheel.

4. The wide-range height adjustment device according to claim 2, characterized in that, Each of the movable cylinders (2) has a side opening (23), and a second support wheel (42) is installed at the side opening (23) of the corresponding movable cylinder.

5. A wide-range height adjustment device according to any one of claims 2 to 4, characterized in that, The i-th stage movable cylinder is provided with a guide pulley (43) for supporting the corresponding driven belt (41).

6. The wide-range height adjustment device according to claim 1, characterized in that, The power transmission assembly (4) includes a gear transmission structure located on the first and kth stage movable cylinders, a driven rack (47) located on the (k+1)th stage movable cylinder, and a driving rack (44) located on the fixed cylinder (1) and the (k-1)th stage movable cylinder; the gear transmission structure includes a driving gear (45a), a driven gear (45b), and an intermediate transmission component that enables the driving gear (45a) and the driven gear (45b) to rotate synchronously; the driven gear (45b) on the kth stage movable cylinder meshes with the driven rack (47) on the (k+1)th stage movable cylinder; the driving rack (44) on the (k-1)th stage movable cylinder meshes with the driving gear (45a) on the kth stage movable cylinder, and the driving rack (44) on the fixed cylinder (1) meshes with the driving gear (45a) on the first stage movable cylinder; wherein, k is a natural number, and 2≤k≤N-1.

7. A wide-range height adjustment device according to claim 6, characterized in that, The intermediate transmission component includes a first pulley coaxially arranged with the driving gear (45a), a second pulley coaxially arranged with the driven gear (45b), and a transmission belt (46) or transmission chain wound around the first pulley and the second pulley.

8. The wide-range height adjustment device according to claim 1, characterized in that, The two adjacent movable cylinders (2) are slidably connected by a guide mechanism (5), and the first movable cylinder and the fixed cylinder (1) are slidably connected by a guide mechanism (5).

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