Telescopic locking device of multi-stage sleeve tower structure

Abstract

The invention provides a telescopic locking device of a multi-stage sleeve tower structure, which comprises a multi-stage sleeve tower and a locking mechanism, the locking mechanism is mounted on an outer tower section in the multi-stage sleeve tower, and the locking mechanism is positioned on a motion trail of an inner tower section in the multi-stage sleeve tower. And the outer tower section and the inner tower section are locked through the locking mechanism, so that the inner tower section is prevented from jumping out randomly during transportation, and the safety is improved.

Description

Technical Field

[0001] This invention relates to the field of telescopic structure locking equipment, and in particular to a telescopic locking device for a multi-stage tower structure. Background Technology

[0002] Multi-level tower structures are transported in an inverted state and need to be flipped to an upright state for use. During transportation, the inner tower sections are prone to randomly popping out, resulting in low safety. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a telescopic locking device for a multi-stage tower structure, which addresses the shortcomings of the prior art.

[0004] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: a telescopic locking device for a multi-stage tower structure, comprising: a multi-stage tower and a locking mechanism, wherein the locking mechanism is installed on the outer tower section of the multi-stage tower and the locking mechanism is located on the movement trajectory of the inner tower section of the multi-stage tower.

[0005] The beneficial effects of adopting the technical solution of the present invention are: the outer tower section and the inner tower section are locked by the locking mechanism to prevent the inner tower section from randomly popping out during transportation, thereby improving safety.

[0006] Furthermore, the multi-stage tower is rotatably mounted on a support frame, and the support frame is provided with a triggering component for triggering the locking mechanism, the triggering component being located on the movement trajectory of the locking mechanism.

[0007] The beneficial effects of adopting the above-mentioned further technical solution are: the support frame facilitates the support of multi-stage towers and the rotation of the multi-stage towers. The triggering component facilitates the triggering of the locking mechanism to lock the multi-stage towers, preventing the inner tower sections from randomly popping out during transportation and improving safety.

[0008] Furthermore, the support frame includes: a base plate and a pair of support plates, the pair of support plates being mounted on the base plate, the multi-stage tower being rotatably mounted on the pair of support plates, and the connection position between the multi-stage tower and the pair of support plates being adjacent to the bottom end of the multi-stage tower.

[0009] The beneficial effects of adopting the above-mentioned further technical solution are: the setting of a pair of support plates realizes stable support for multi-stage towers, facilitates stable rotation of multi-stage towers on a pair of support plates, and improves stability and reliability.

[0010] Furthermore, the triggering component is a stop bar, which is mounted in the middle of a support plate.

[0011] The beneficial effects of adopting the above-mentioned further technical solution are as follows: the setting of the stop bar facilitates the triggering of the locking mechanism, realizing the locking of multi-stage towers, preventing the inner tower sections from randomly popping out during transportation, and improving safety. No additional drive source is required; by cleverly utilizing the pitching motion of the tower body, a stop bar is set on the support frame. When the tower body rotates to a certain angle, the stop bar contacts the side drive rod. As the tower body continues to rotate, the stop bar will push the drive rod, which in turn drives the paired locking hook. With the assistance of the weight of the entire tower body, the paired locking hook will disengage from the locking hook set on the innermost tower, thus unlocking the locking mechanism.

[0012] Furthermore, a limiting plate for limiting the multi-stage tower is installed between the pair of support plates, and the two ends of the limiting plate are respectively connected to the pair of support plates.

[0013] The beneficial effects of adopting the above-mentioned further technical solution are: the limiting plate is used to limit the multi-stage tower, prevent the multi-stage tower from overturning excessively, and improve stability and reliability.

[0014] Furthermore, the bottom of the inner tower section in the multi-stage tower is equipped with a locking hook adapted to the locking mechanism. The locking mechanism is located at the bottom of the outer tower section in the multi-stage tower and is located on the movement trajectory of the locking hook.

[0015] The beneficial effects of adopting the above-mentioned further technical solution are as follows: A locking hook is designed on the innermost tower section, and the locking hook is integrated with the tower section, extending and retracting simultaneously. This facilitates the locking of multi-stage towers and prevents inner tower sections from randomly slipping out during transportation. The locking hook also facilitates the locking mechanism's cooperation with the locking hook to achieve the locking of multi-stage towers.

[0016] Furthermore, the locking mechanism includes: a mating locking hook and a triggering mechanism for triggering the rotation of the mating locking hook, the mating locking hook being rotatably mounted on the outer tower section of the multi-stage tower, and the triggering mechanism being connected to the mating locking hook.

[0017] The beneficial effects of adopting the above-mentioned further technical solution are: the pairing locking hooks facilitate the locking of multi-stage towers through their cooperation. The triggering mechanism is used to trigger the movement of the pairing locking hooks.

[0018] Furthermore, the triggering mechanism includes a linkage shaft and a drive rod. The linkage shaft is rotatably installed at the bottom of the outer tower section in the multi-stage tower. The two ends of the linkage shaft are fixedly connected to the matching locking hook and the drive rod, respectively. The drive rod is located on the outside of the outer tower section in the multi-stage tower.

[0019] The beneficial effects of adopting the above-mentioned further technical solution are as follows: A rotatable pairing locking hook is set at the bottom of the first-level tower. The pairing locking hook is fixedly locked on the linkage shaft. The other side of the linkage shaft is tightly connected to the drive rod on the side of the tower body. Therefore, when the drive rod rotates, it will drive the inner pairing locking hook to rotate in the same direction through the linkage shaft. This structure does not require an additional drive source. It cleverly utilizes the pitching motion of the tower body and sets a stop bar on the support frame. When the tower body rotates to a certain angle, the stop bar contacts the side drive rod. When the tower body continues to rotate, the stop bar will push the drive rod, and the drive rod will drive the pairing locking hook. With the assistance of the weight of the entire tower body, the pairing locking hook will disengage from the locking hook set in the innermost tower, which can unlock the locking mechanism.

[0020] Furthermore, the drive rod is connected to a return component, which is connected to the outer tower section of the multi-stage tower.

[0021] The beneficial effects of adopting the above-mentioned further technical solution are: when the tower body performs a tilting and lowering motion, as the tower body slowly falls back, the drive rod also returns to its initial position under the return action of the return component. This facilitates the automatic return of the locking mechanism, simplifies the structure, and reduces the user's labor intensity.

[0022] Furthermore, the multi-level tower set includes: a first-level tower, a second-level tower, a third-level tower, a fourth-level tower, and a fifth-level tower. The first-level tower is the outer tower section in the multi-level tower set, and the fifth-level tower is the inner tower section in the multi-level tower set. The second-level tower is retractably installed in the first-level tower, the third-level tower is retractably installed in the second-level tower, the fourth-level tower is retractably installed in the third-level tower, and the fifth-level tower is retractably installed in the fourth-level tower.

[0023] The beneficial effects of adopting the above-mentioned further technical solutions are: the multi-level tower structure design enables the expansion and contraction of the multi-level towers, and the locking of the multi-level towers is achieved by locking the first-level tower and the fifth-level tower, preventing the inner tower sections from randomly popping out during transportation and improving safety.

[0024] The advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1This is one of the structural schematic diagrams of the telescopic locking device for a multi-level tower structure provided in an embodiment of the present invention.

[0027] Figure 2 This is the second schematic diagram of the telescopic locking device for a multi-level tower structure provided in an embodiment of the present invention.

[0028] Figure 3 The third schematic diagram of the telescopic locking device for the multi-level tower structure provided in the embodiment of the present invention.

[0029] Figure 4 The fourth schematic diagram of the telescopic locking device for the multi-level tower structure provided in the embodiment of the present invention.

[0030] Figure 5 The fifth schematic diagram of the telescopic locking device for the multi-level tower structure provided in the embodiments of the present invention.

[0031] Figure 6 This is the sixth structural schematic diagram of the telescopic locking device for the multi-level tower structure provided in the embodiments of the present invention.

[0032] Figure 7 The seventh schematic diagram of the telescopic locking device for the multi-stage tower structure provided in the embodiments of the present invention.

[0033] The following are the diagram numbers: 1. Multi-stage tower; 2. Locking mechanism; 3. Support frame; 4. Base plate; 5. Support plate; 6. Stop bar; 7. Limiting plate; 8. Locking hook; 9. Paired locking hook; 10. Linkage shaft; 11. Drive rod; 12. Return component; 13. First-stage tower; 14. Second-stage tower; 15. Third-stage tower; 16. Fourth-stage tower; 17. Fifth-stage tower. Detailed Implementation

[0034] The principles and features of the present invention are described below with reference to the accompanying drawings. The embodiments described are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0037] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0038] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper", "lower", "horizontal", "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is usually placed during use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0039] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0040] like Figures 1 to 7 As shown, an embodiment of the present invention provides a telescopic locking device for a multi-stage tower structure, including: a multi-stage tower 1 and a locking mechanism 2. The locking mechanism 2 is installed on the outer tower section of the multi-stage tower 1 and is located on the movement trajectory of the inner tower section of the multi-stage tower.

[0041] The beneficial effects of adopting the technical solution of the present invention are: the outer tower section and the inner tower section are locked by the locking mechanism to prevent the inner tower section from randomly popping out during transportation, thereby improving safety.

[0042] This invention provides a telescopic locking device for a multi-stage tower structure. During transport, it lies flat. In use, it needs to be tilted 90 degrees to an upright position, and then the inner tower is pulled up using a hydraulic winch and steel wire rope. This multi-stage tower structure requires both azimuth and tilt rotation. Therefore, this telescopic locking device utilizes the tilting motion of the tower and the self-weight of the inner tower sections after they are erected.

[0043] To prevent inner tower sections from randomly slipping out during transportation when the multi-stage tower is tilted to 0° (in its lying position), a multi-layer anti-slip structure was designed to accommodate the multi-stage tower and the need for a 90° tilt rotation. The entire tower (multi-stage tower 1) rests on a support frame 3.

[0044] like Figures 1 to 7 As shown, the multi-stage tower 1 is rotatably mounted on the support frame 3, and the support frame 3 is provided with a triggering component for triggering the locking mechanism 2. The triggering component is located on the movement trajectory of the locking mechanism 2.

[0045] The beneficial effects of adopting the above-mentioned further technical solution are: the support frame facilitates the support of multi-stage towers and the rotation of the multi-stage towers. The triggering component facilitates the triggering of the locking mechanism to lock the multi-stage towers, preventing the inner tower sections from randomly popping out during transportation and improving safety.

[0046] like Figures 1 to 7 As shown, the support frame 3 further includes a base plate 4 and a pair of support plates 5. The pair of support plates 5 are mounted on the base plate 4, and the multi-stage tower 1 is rotatably mounted on the pair of support plates 3. The connection position between the multi-stage tower 1 and the pair of support plates 3 is adjacent to the bottom end of the multi-stage tower 1.

[0047] The beneficial effects of adopting the above-mentioned further technical solution are: the setting of a pair of support plates realizes stable support for multi-stage towers, facilitates stable rotation of multi-stage towers on a pair of support plates, and improves stability and reliability.

[0048] like Figures 1 to 7 As shown, the triggering component further includes a stop bar 6, which is mounted in the middle of a support plate 5.

[0049] The beneficial effects of adopting the above-mentioned further technical solution are as follows: the setting of the stop bar facilitates the triggering of the locking mechanism, realizing the locking of multi-stage towers, preventing the inner tower sections from randomly popping out during transportation, and improving safety. No additional drive source is required; by cleverly utilizing the pitching motion of the tower body, a stop bar is set on the support frame. When the tower body rotates to a certain angle, the stop bar contacts the side drive rod. As the tower body continues to rotate, the stop bar will push the drive rod, which in turn drives the paired locking hook. With the assistance of the weight of the entire tower body, the paired locking hook will disengage from the locking hook set on the innermost tower, thus unlocking the locking mechanism.

[0050] like Figures 1 to 7 As shown, further, a limiting plate 7 for limiting the multi-stage tower 1 is installed between a pair of support plates 5, and the two ends of the limiting plate 7 are respectively connected to a pair of support plates 5.

[0051] The beneficial effects of adopting the above-mentioned further technical solution are: the limiting plate is used to limit the multi-stage tower, prevent the multi-stage tower from overturning excessively, and improve stability and reliability.

[0052] like Figures 1 to 7 As shown, further, the bottom of the inner tower section of the multi-stage tower 1 is equipped with a locking hook 8 that is adapted to the locking mechanism 2. The locking mechanism 2 is located at the bottom of the outer tower section of the multi-stage tower 1 and is located on the movement trajectory of the locking hook 8.

[0053] The beneficial effects of adopting the above-mentioned further technical solution are as follows: A locking hook is designed on the innermost tower section, and the locking hook is integrated with the tower section, extending and retracting simultaneously. This facilitates the locking of multi-stage towers and prevents inner tower sections from randomly slipping out during transportation. The locking hook also facilitates the locking mechanism's cooperation with the locking hook to achieve the locking of multi-stage towers.

[0054] like Figures 1 to 7 As shown, the locking mechanism 2 further includes a mating locking hook 9 and a triggering mechanism for triggering the rotation of the mating locking hook 9. The mating locking hook 9 is rotatably mounted on the outer tower section of the multi-stage tower 1, and the triggering mechanism is connected to the mating locking hook 9.

[0055] The beneficial effects of adopting the above-mentioned further technical solution are: the pairing locking hooks facilitate the locking of multi-stage towers through their cooperation. The triggering mechanism is used to trigger the movement of the pairing locking hooks.

[0056] like Figures 1 to 7 As shown, the triggering mechanism further includes a linkage shaft 10 and a drive rod 11. The linkage shaft 10 is rotatably installed at the bottom of the outer tower section in the multi-stage tower 1. The two ends of the linkage shaft 10 are fixedly connected to the paired locking hook 9 and the drive rod 11, respectively. The drive rod 11 is located outside the outer tower section in the multi-stage tower 1.

[0057] The beneficial effects of adopting the above-mentioned further technical solution are as follows: A rotatable pairing locking hook is set at the bottom of the first-level tower. The pairing locking hook is fixedly locked on the linkage shaft. The other side of the linkage shaft is tightly connected to the drive rod on the side of the tower body. Therefore, when the drive rod rotates, it will drive the inner pairing locking hook to rotate in the same direction through the linkage shaft. This structure does not require an additional drive source. It cleverly utilizes the pitching motion of the tower body and sets a stop bar on the support frame. When the tower body rotates to a certain angle, the stop bar contacts the side drive rod. When the tower body continues to rotate, the stop bar will push the drive rod, and the drive rod will drive the pairing locking hook. With the assistance of the weight of the entire tower body, the pairing locking hook will disengage from the locking hook set in the innermost tower, which can unlock the locking mechanism.

[0058] like Figures 1 to 7As shown, the drive rod 11 is further connected to a return component 12, which is connected to the outer tower section of the multi-stage tower 1.

[0059] The beneficial effects of adopting the above-mentioned further technical solution are: when the tower body performs a tilting and lowering motion, as the tower body slowly falls back, the drive rod also returns to its initial position under the return action of the return component. This facilitates the automatic return of the locking mechanism, simplifies the structure, and reduces the user's labor intensity.

[0060] The return component 12 can be a spring, specifically a tension spring.

[0061] like Figures 1 to 7 As shown, the multi-level tower 1 further includes: a first-level tower 13, a second-level tower 14, a third-level tower 15, a fourth-level tower 16, and a fifth-level tower 17. The first-level tower 13 is the outer tower section of the multi-level tower 1, and the fifth-level tower 17 is the inner tower section of the multi-level tower 1. The second-level tower 14 is retractably installed in the first-level tower 13, the third-level tower 15 is retractably installed in the second-level tower 14, the fourth-level tower 16 is retractably installed in the third-level tower 15, and the fifth-level tower 17 is retractably installed in the fourth-level tower 16.

[0062] The beneficial effects of adopting the above-mentioned further technical solutions are: the multi-level tower structure design enables the expansion and contraction of the multi-level towers, and the locking of the multi-level towers is achieved by locking the first-level tower and the fifth-level tower, preventing the inner tower sections from randomly popping out during transportation and improving safety.

[0063] like Figures 1 to 7 As shown, taking a five-level nested tower as an example, the first level (level 1 tower 13) contains four nested towers. Each tower section is numbered sequentially from the outside in, with the outermost tower section being level 1 tower 13 and the innermost tower section being level 5 tower 17. This telescopic locking device (telescopic locking device for multi-level nested tower structures) is mainly arranged on the outermost and innermost tower sections. A locking hook 8 is designed on the innermost tower section, which is integrated with tower section five (level 5 tower 17) and extends and retracts simultaneously.

[0064] A rotatable pairing hook 9 is installed at the bottom of the first-level tower (first-level tower 13). The pairing hook 9 is fixedly locked on the linkage shaft 10. The other side of the linkage shaft 10 is tightly connected to the drive rod 11 on the side of the tower body (multi-level tower 1). Therefore, when the drive rod 11 rotates, it will drive the inner pairing hook 9 to rotate in the same direction through the linkage shaft 10. This structure does not require an additional drive source. It cleverly utilizes the pitching motion of the tower body. A stop rod 6 is installed on the support frame 3. When the tower body rotates to a certain angle, the stop rod 6 contacts the side drive rod 11. When the tower body continues to rotate, the stop rod 6 will push the drive rod 11. The drive rod 11 drives the pairing hook 9. With the assistance of the weight of the entire tower body, the pairing hook 9 will disengage from the locking hook 8 installed on the innermost tower, which can unlock the locking mechanism (the telescopic locking device of the multi-level tower structure).

[0065] The unlocking process of the entire locking mechanism (telescopic locking device of multi-stage tower structure): The entire tower body is in a 0° pitch (lying down) state beforehand. At this time, the state of the locking mechanism is as follows: the paired locking hook 9 on the first tower body (first-stage tower 13) and the locking hook (locking hook 8) on the fifth tower body (fifth-stage tower 17) are in an interlocked state; the return spring (returning component 12) at the front end of the slewing block (drive rod 11) is in a relaxed state. Then the tower body performs a pitching and flipping motion. When the tower body is about to flip to the correct position (90°), the stop block (stop rod 6) set on the turntable (support frame 3) comes into contact with the slewing block (drive rod 11) set on the side of the first tower body (first-level tower 13). The tower body continues to flip, and the slewing block (drive rod 11) is then pushed to the rear of the tower body. The slewing block (drive rod 11) rotates synchronously with the drive connecting shaft (linkage shaft 10) through the shaft hole, thereby driving the paired locking hook 9 on the other side of the connecting shaft (linkage shaft 10) to disengage from the locking hook (locking hook 8) set on the fifth tower body (fifth-level tower 17), thus completing the unlocking of the locking mechanism.

[0066] Conversely, the locking process of the entire locking mechanism (the telescopic locking device of the multi-stage tower structure) is as follows: the entire tower body is initially in a 90° pitch (erected) state. At this time, the locking mechanism is in the following state: the paired locking hook 9 on the first tower section (first-stage tower 13) and the locking hook (locking hook 8) on the fifth tower section are disengaged; the return spring (return component 12) at the front end of the slewing block (drive rod 11) is in a stretched and taut state. Then the tower body performs a pitching and lying down action. As the tower body slowly falls back, the slewing block (drive rod 11) also returns to its initial position under the pulling force of the return spring (return component 12).

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A telescopic locking device for a multi-stage nested tower structure, characterized in that, It includes: a multi-stage tower and a locking mechanism, wherein the locking mechanism is installed on the outer tower section of the multi-stage tower and the locking mechanism is located on the movement trajectory of the inner tower section of the multi-stage tower.

2. The telescopic locking device for a multi-stage nested tower structure according to claim 1, characterized in that, The multi-stage tower is rotatably mounted on a support frame, and the support frame is provided with a triggering component for triggering the locking mechanism. The triggering component is located on the movement trajectory of the locking mechanism.

3. The telescopic locking device for a multi-stage nested tower structure according to claim 2, characterized in that, The support frame includes a base plate and a pair of support plates. The pair of support plates are mounted on the base plate, and the multi-stage tower is rotatably mounted on the pair of support plates. The connection position between the multi-stage tower and the pair of support plates is adjacent to the bottom end of the multi-stage tower.

4. The telescopic locking device for a multi-stage nested tower structure according to claim 3, characterized in that, The triggering component is a stop bar, which is installed in the middle of a support plate.

5. The telescopic locking device for a multi-stage nested tower structure according to claim 3, characterized in that, A limiting plate for limiting the movement of the multi-stage tower is installed between a pair of support plates, and the two ends of the limiting plate are respectively connected to a pair of support plates.

6. The telescopic locking device for a multi-stage nested tower structure according to claim 1, characterized in that, The bottom of the inner tower section in the multi-stage tower is equipped with a locking hook adapted to the locking mechanism. The locking mechanism is located at the bottom of the outer tower section in the multi-stage tower and is located on the movement trajectory of the locking hook.

7. The telescopic locking device for a multi-stage nested tower structure according to claim 1, characterized in that, The locking mechanism includes a pairing locking hook and a triggering mechanism for triggering the rotation of the pairing locking hook. The pairing locking hook is rotatably mounted on the outer tower section of the multi-stage tower, and the triggering mechanism is connected to the pairing locking hook.

8. The telescopic locking device for a multi-stage nested tower structure according to claim 7, characterized in that, The triggering mechanism includes a linkage shaft and a drive rod. The linkage shaft is rotatably installed at the bottom of the outer tower section in the multi-stage tower. The two ends of the linkage shaft are fixedly connected to the matching locking hook and the drive rod, respectively. The drive rod is located on the outside of the outer tower section in the multi-stage tower.

9. The telescopic locking device for a multi-stage nested tower structure according to claim 8, characterized in that, The drive rod is connected to a return component, which is connected to the outer tower section of the multi-stage tower.

10. The telescopic locking device for a multi-stage nested tower structure according to claim 1, characterized in that, The multi-level tower set includes: a first-level tower, a second-level tower, a third-level tower, a fourth-level tower, and a fifth-level tower. The first-level tower is the outer tower section of the multi-level tower set, and the fifth-level tower is the inner tower section of the multi-level tower set. The second-level tower is retractably installed in the first-level tower, the third-level tower is retractably installed in the second-level tower, the fourth-level tower is retractably installed in the third-level tower, and the fifth-level tower is retractably installed in the fourth-level tower.

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