Side sealing device of movable workshop

Abstract

The invention provides a side face sealing device of a movable workshop. The side face sealing device comprises a long edge structure, a short edge structure, a lifting mechanism, a sealing strip and a pulley gravity rigidity improving assembly. The long-edge structure and the short-edge structure are vertically connected and are respectively and correspondingly arranged at the bottom ends of two vertical side surfaces of the movable workshop; the lifting mechanism is connected with the long-edge mechanism and / or the short-edge structure and used for driving the long-edge mechanism and / or the short-edge structure to move up and down relative to the movable plant; the sealing strips are arranged on the bottom surfaces of the long-edge structures and the short-edge structures; the pulley gravity rigidity lifting assembly is connected with the middle of the long-edge structure and used for providing upward lifting force for the middle of the long-edge structure. The sealing device can be rapidly lifted when the movable workshop walks, the whole sealing device is pressed on the ground when the movable workshop is parked, the middle of the long-edge structure is prevented from sinking, and the long-edge structure and the short-edge structure synchronously ascend and descend.

Description

Technical Field

[0001] This application relates to the field of sealing structure technology, and in particular to a side sealing device for a mobile factory. Background Technology

[0002] During rocket launch missions, after the rocket is transferred to the launch pad, there is a need for testing or segmented assembly at the pad, as well as the need to protect the hydraulic lifting erector from long-term wind and sand damage when there are no launch missions. This has led to the design of mobile launch facility for aerospace launches. The facility moves above the rocket after it enters the launch pad to protect it, and during launch, it moves to a location away from the rocket launch to avoid damage from the rocket's wake. When there are no launch missions, the facility is moved above the erector to protect it. This type of mobile facility is used in the Gobi Desert, primarily for protecting equipment from wind and sand. It requires high sealing, so the bottom and sides of the facility need to be strictly sealed. However, when moving the facility, a strict seal on all four sides is also necessary to allow for its movement. Existing technologies mainly have the following drawbacks:

[0003] First, fixed skirt seal: When walking, the seal slides and rubs against the ground, resulting in high resistance, rapid wear, and easy tearing when encountering protrusions.

[0004] Second, segmented folding seals: require manual or hydraulic cylinder operation segment by segment, resulting in poor synchronization and inability to seal continuously at corners.

[0005] Third, integral lifting seals: long-stroke hydraulic cylinders are often used. The large temperature difference between day and night in the Gobi Desert and the drastic changes in the viscosity of hydraulic oil can lead to leakage, pressure loss and low-temperature creep. Single-point lifting results in large deflection at the mid-span of the long side, uneven gap between the sealing strip and the ground, and seal failure.

[0006] Fourth, lack of active stiffness compensation: When the long side structure exceeds 20m, its own weight can cause a downward deflection of over 30mm. The rubber strips cannot compress equally with the ground subsidence, forming a "V"-shaped air leakage channel. If the long side structure exceeds 50 meters, the middle part of the long side structure is prone to sinking, which will hinder the movement of the entire structure during overall lifting. Specifically, even if the lifting rods at both ends are raised to the top, the middle structure will still sink, even contacting the ground, causing the entire mobile factory to become stuck or unable to move. In addition, excessive downward sinking of the middle structure also makes it impossible to install the composite material panels inside the long side structure.

[0007] Therefore, the urgent technical problem to be solved is: how to provide a side sealing device for a mobile factory that can be quickly raised when the mobile factory is moving and pressed together when parked, so as to prevent the middle of the long side structure from sinking and allow the long and short side structures to rise and fall synchronously. Summary of the Invention

[0008] The purpose of this application is to provide a side sealing device for a mobile factory, which enables the sealing device to be quickly raised when the mobile factory is in motion and to press firmly against the ground when parked, preventing the middle of the long side structure from sinking, and allowing the long side structure and the short side structure to rise and fall synchronously.

[0009] To achieve the above objectives, this application provides a side sealing device for a mobile factory building. The device includes: a long side structure, a short side structure, a lifting mechanism, a sealing strip, and a pulley gravity stiffness lifting assembly. The long side structure and the short side structure are vertically connected and respectively disposed at the bottom ends of two mutually perpendicular sides of the mobile factory building. The lifting mechanism is connected to the long side structure and / or the short side structure, and is used to drive the long side structure and / or the short side structure to move up and down relative to the mobile factory building. The sealing strip is disposed on the bottom surface of the long side structure and the short side structure. The pulley gravity stiffness lifting assembly is connected to the middle part of the long side structure, and is used to provide an upward lifting force to the middle part of the long side structure.

[0010] The side sealing device for the mobile factory described above, wherein the lifting mechanism includes: a lifting base, a drive motor, a reducer, a rotating shaft, and a first worm gear and lead screw mechanism; the first worm gear and lead screw mechanism includes: a first worm gear and a first lead screw; the drive motor is fixed on the lifting base, and the rotating shaft is connected to the output shaft of the drive motor through the reducer; the first worm gear is mounted on the rotating shaft, and the first worm gear moves synchronously with the rotating shaft; the first worm gear is meshed with the first lead screw, and the rotation of the first worm gear drives the first lead screw to rise and fall; the bottom end of the first lead screw is connected to the long side structure or the short side structure.

[0011] The side sealing device for the mobile factory as described above, wherein the lifting mechanism further includes: a gear steering mechanism, a rotating shaft connecting rod, and a second worm gear screw mechanism; the second worm gear screw mechanism is connected to the rotating shaft through the gear steering mechanism and the rotating shaft connecting rod.

[0012] The side sealing device for the mobile factory as described above, wherein the second worm gear screw mechanism includes: a second worm gear and a second screw; the second worm gear is connected to the rotating shaft connecting rod, and the rotating shaft connecting rod and the second worm gear operate synchronously; the second screw is meshed with the second worm gear; the bottom end of the second screw is connected to the long side structure or the short side structure.

[0013] The side sealing device for the mobile factory as described above, wherein the pulley gravity stiffness lifting assembly includes: a fixed pulley, a structural fixing frame, a lifting ring, a steel cable, a guide rod, and a metal weight; the structural fixing frame is fixedly connected to the mobile factory; the fixed pulley is mounted on the structural fixing frame; the steel cable passes around the fixed pulley, with one end connected to the lifting ring and the other end connected to the metal weight; the metal weight is slidably connected to the guide rod.

[0014] The side sealing device of the mobile factory as described above, wherein the guide rod is arranged in a vertical direction and fixedly connected to the bottom end of the structural fixing frame.

[0015] The side sealing device for the mobile factory described above includes a first fixed pulley and a second fixed pulley; the first fixed pulley and the second fixed pulley are spaced apart and located in the same horizontal plane.

[0016] The side sealing device of the mobile factory as described above, wherein the inner wall of the long side structure and / or the short side structure is provided with a sliding groove in the vertical direction, and a fixed sliding bracket of the factory is slidably connected in the sliding groove; the fixed sliding bracket of the factory is fixedly connected to the mobile factory.

[0017] The side sealing device of the mobile factory described above, wherein both the long side structure and the short side structure adopt steel frames as the outer structural load-bearing bodies, and composite material plates are installed inside the structural frames.

[0018] The side sealing device of the mobile factory described above, wherein the top edges of both the long side structure and the short side structure are provided with structural frames; the lifting mechanism is connected to the structural frames.

[0019] The beneficial effects achieved by this application are as follows:

[0020] (1) This application installs a U-shaped rubber strip below the device to fill the low-lying areas to adapt to uneven ground conditions, achieve complete sealing, and improve the sealing effect.

[0021] (2) This application sets up a pulley gravity stiffness lifting assembly, which uses the natural weight of the metal block to resist the sinking of the middle part of the device structure, thus solving the problem of downward sinking deformation caused by insufficient structural stiffness in the middle part of the device structure due to its excessive length.

[0022] (3) In this application, a gear-type shaft commutator is set above the corner where the long side structure turns to the short side structure. The rotation speed of the long side shaft connecting rod is converted to the rotation speed of the short side shaft connecting rod at the same speed. The rotation speed of the shaft connecting rods in the two directions is controlled to be equal. Then, the worm gear screw mechanism is converted into lifting motion to realize the synchronous sinking or rising of the short side structure and the long side structure, thereby improving the overall motion reliability and stability of the device. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings.

[0024] Figure 1 This is a schematic diagram of the connection between a side sealing device of a mobile factory and the mobile factory, according to an embodiment of this application.

[0025] Figure 2 This is a schematic diagram of the structure of a side sealing device for a mobile factory according to an embodiment of this application.

[0026] Figure 3 This is a partial structural schematic diagram of a side sealing device for a mobile factory according to an embodiment of this application.

[0027] Figure 4 This is a schematic diagram of the pulley gravity stiffness enhancement assembly according to an embodiment of this application.

[0028] Figure 5 This is a structural schematic diagram of the lifting mechanism according to Embodiment 1 of this application.

[0029] Figure 6 This is a perspective view of the lifting mechanism of Embodiment 2 of this application.

[0030] Figure 7 This is a front view of the lifting mechanism according to Embodiment 2 of this application.

[0031] Reference numerals: 1-Side sealing device; 2-Mobile factory building; 3-Long side structure; 4-Short side structure; 5-Lifting mechanism; 6-Pulley gravity stiffness lifting assembly; 7-Factory building fixed sliding bracket; 8-Sealing strip; 31-Structural frame; 32-Slide groove; 51-Drive motor; 52-First worm gear screw mechanism; 53-Gear steering gear; 54-Second worm gear screw mechanism; 55-Rotating shaft connecting rod; 56-Lifting machine base; 57-Rotating shaft; 61-Structural fixing frame; 62-Fixed pulley; 63-Lifting ring; 64-Guide rod; 65-Steel cable; 66-Metal weight; 551-Long side rotating shaft connecting rod; 552-Short side rotating shaft connecting rod; 521-First screw. Detailed Implementation

[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0033] like Figure 1-3 As shown, this application provides a side sealing device 1 for a mobile factory building. The side sealing device 1 is connected to the bottom of the mobile factory building 2. The side sealing device 1 includes: a long side structure 3, a short side structure 4, a lifting mechanism 5, a sealing strip 8, and a pulley gravity stiffness lifting assembly 6. The long side structure 3 and the short side structure 4 are vertically connected and are respectively disposed at the bottom ends of two mutually perpendicular sides of the mobile factory building 2. The lifting mechanism 5 is connected to the long side mechanism and / or the short side structure 4 and is used to drive the long side mechanism and / or the short side structure 4 to move up and down relative to the mobile factory building 2. The sealing strip 8 is disposed on the bottom surface of the long side structure 3 and the short side structure 4. The pulley gravity stiffness lifting assembly 6 is connected to the middle part of the long side structure 3 and is used to provide an upward lifting force to the middle part of the long side structure 3.

[0034] As a specific embodiment of the present invention, when the mobile factory 2 needs to be moved, the lifting mechanism 5 lifts the sealing device off the ground. When the mobile factory 2 reaches the parking position, the lifting mechanism 5 drives the sealing device to fall down and presses the sealing device onto the ground.

[0035] As a specific embodiment of the present invention, since the long side structure 3 is relatively long, its middle part may sink and deform due to insufficient structural rigidity, resulting in poor sealing performance. The pulley gravity rigidity lifting assembly 6 provides an upward lifting force to the middle part of the long side structure 3, preventing the middle part of the long side structure 3 from sinking.

[0036] like Figure 3 , 5As shown in Figure 7, the lifting mechanism 5 includes: a lifting base 56, a drive motor 51, a reducer, a rotating shaft 57, and a first worm gear and lead screw mechanism 52. The first worm gear and lead screw mechanism 52 includes: a first worm gear and a first lead screw 521. The drive motor 51 is fixed on the lifting base 56, and the rotating shaft 57 is connected to the output shaft of the drive motor 51 through the reducer. The first worm gear is mounted on the rotating shaft 57, and the first worm gear moves synchronously with the rotating shaft 57. The first worm gear meshes with the first lead screw 521, and the rotation of the first worm gear drives the first lead screw 521 to rise and fall. The bottom end of the first lead screw 521 is connected to the long side structure 3 or the short side structure 4. After the drive motor 51 starts, the reducer converts the high-speed rotation of the drive motor 51 into a lower speed, which drives the first worm gear to rotate through the rotating shaft 57. The first worm gear drives the first lead screw 521 to rise and fall, and the first lead screw 521 drives the structural frame 31 below it to rise and fall. The first worm gear and lead screw mechanism 52 has a self-locking function, making it convenient, safe, and reliable to use.

[0037] like Figure 3 and 5 As shown, the lifting mechanism 5 also includes: a gear steering mechanism 53, a rotating shaft connecting rod 55, and a second worm gear screw mechanism 54; the second worm gear screw mechanism 54 is connected to the rotating shaft 57 via a gear axial actuator and the rotating shaft connecting rod 55. The drive motor 51 can drive the first worm gear screw mechanism 52 and the second worm gear screw mechanism 54 to move synchronously, thereby enabling the first worm gear screw mechanism 52 and the second worm gear screw mechanism 54 to drive the long side structure 3 and the short side structure 4 to move synchronously.

[0038] like Figure 5 As shown, the rotating shaft connecting rod 55 includes a long-side rotating shaft connecting rod 551 and a short-side rotating shaft connecting rod 552; one end of the gear steering device 53 is connected to the rotating shaft 57 via the long-side rotating shaft connecting rod 551, and the other end is connected to the second worm gear screw mechanism 54 via the short-side rotating shaft connecting rod 552. The long-side rotating shaft connecting rod 551 and the short-side rotating shaft connecting rod 552 are arranged perpendicularly to each other. The gear steering device 53 is a gear-type rotating shaft reversing device, and the gear steering device 53 is located above the corner of the long-side structure 3 and the short-side structure 4. The gear steering device 53 is used to convert the rotation speed of the long-side rotating shaft connecting rod 551 to the short-side rotating shaft connecting rod 552 at a constant speed, controlling the long-side rotating shaft connecting rod 551 and the short-side rotating shaft connecting rod 552 to rotate at a constant speed. After passing through the second worm gear screw mechanism 54, it is converted into the extension and retraction motion of the upper and lower transmission rods, realizing the synchronous lifting and lowering of the short-side structure 4 and the long-side structure 3.

[0039] As a specific embodiment of the present invention, the second worm gear screw mechanism 54 includes: a second worm gear and a second screw; the second worm gear and a rotating shaft connecting rod 55, the rotating shaft connecting rod 55 and the second worm gear running synchronously; the second screw and the second worm gear meshing connection; the bottom end of the second screw is connected to the long side structure 3 or the short side structure 4, and the lifting and lowering of the second screw drives the lifting and lowering of the long side structure 3 or the short side structure 4.

[0040] like Figure 4 As shown, the pulley gravity stiffness lifting assembly 6 includes: a fixed pulley 62, a structural fixing frame 61, a lifting ring 63, a steel cable 65, a guide rod 64, and a metal weight 66; the structural fixing frame 61 is fixedly connected to the mobile factory 2; the fixed pulley 62 is mounted on the structural fixing frame 61; the lifting ring 63 is fixedly connected to the upper crossbeam of the long side structure 3 or the short side structure 4; the steel cable 65 hangs down naturally after passing over the fixed pulley 62, with one end connected to the lifting ring 63 and the other end connected to the metal weight 66; the metal weight 66 is slidably connected to the guide rod 64. The natural weight of the metal weight 66 resists the sinking of the middle of the long side structure 3. The gravity of the metal weight 66 is converted into an upward lifting force applied to the structural lifting ring 63 through the transmission of the steel cable 65 and the fixed pulley 62, to resist the sinking of the middle of the structure caused by gravity. When the device moves up and down under the action of the lifting mechanism 5, the metal weight 66 will move up and down along the guide rod 64 and will not swing randomly and collide with other structures.

[0041] In a specific embodiment of the present invention, the lifting ring 63 is fixedly connected to the upper frame of the middle part of the long side structure 3. Under its own weight, the metal weight 66 pulls the lifting ring 63 through the steel cable 65, so that the lifting ring 63 applies an upward lifting force to the upper frame of the middle part of the long side structure 3, preventing the middle part of the long side structure 3 from sinking. The advantages of the pulley gravity stiffness lifting assembly 6 in the present invention to prevent the middle part of the long side structure 3 from sinking are as follows: First, it can make the sealing strip 8 at the bottom of the long side structure 3 seamless when in contact with the ground, improving the sealing effect. Second, when the mobile factory 2 moves, after the long side structure 3 is lifted, the middle part of the long side structure 3 will not sink, and the middle part of the long side structure 3 will separate from the ground, so that the mobile factory 2 can move smoothly without jamming or being unable to move. Third, after the middle part of the long side structure 3 does not sink significantly, it is convenient to install the composite material plate on the inner side of the long side structure 3.

[0042] In a preferred embodiment of the present invention, the guide rod 64 is arranged vertically and fixedly connected to the bottom end of the structural fixing frame 61. The guide rod 64 is used to provide guidance for the metal weight 66, so that the metal weight 66 always moves up and down along the guide rod 64.

[0043] In a preferred embodiment of the present invention, the fixed pulley 62 includes a first fixed pulley and a second fixed pulley; the first fixed pulley and the second fixed pulley are spaced apart and located in the same horizontal plane, and the steel cable 65 hangs down naturally after passing over the first fixed pulley and the second fixed pulley.

[0044] like Figure 3As shown, the inner walls of the long side structure 3 and / or the short side structure 4 are provided with a vertical groove 32, and a factory building fixed sliding support 7 is slidably connected in the groove 32; the factory building fixed sliding support 7 is fixedly connected to the mobile factory building 2; the factory building fixed sliding support 7 is limited in the groove 32 and can move up and down along the groove 32. When the mobile factory building moves relative to the long side structure 3 and the short side structure 4, the factory building fixed sliding support 7 moves up or down in the groove 32, thereby improving the stability and reliability of the relative movement of the long side structure 3 and the short side structure 4 with the mobile factory building.

[0045] In a preferred embodiment of the present invention, both the long side structure 3 and the short side structure 4 use steel frames as the outer structural load-bearing bodies, and composite material panels are installed inside the structural frame 31. For example, the composite material panels are PC (polycarbonate) / PMMA (acrylic) composite panels.

[0046] like Figure 3 As shown, the top edges of both the long side structure 3 and the short side structure 4 are provided with structural frames 31; the lifting mechanism 5 is connected to the structural frame 31, and the lifting mechanism 5 drives the structural frame 31, the long side structure 3 and the short side structure 4 to rise and fall as a whole.

[0047] Preferably, the sealing strip 8 is a U-shaped rubber strip. The U-shaped rubber strip deforms and presses to eliminate the gap between the device and the ground, so as to fill the low-lying areas to adapt to uneven ground conditions and achieve a complete seal between the sealing device and the ground.

[0048] The beneficial effects achieved by this application are as follows:

[0049] (1) This application installs a U-shaped rubber strip below the device to fill the low-lying areas to adapt to uneven ground conditions, achieve complete sealing, and improve the sealing effect.

[0050] (2) This application sets up a pulley gravity stiffness lifting assembly, which uses the natural weight of the metal block to resist the sinking of the middle part of the device structure, thus solving the problem of downward sinking deformation caused by insufficient structural stiffness in the middle part of the device structure due to its excessive length.

[0051] (3) In this application, a gear-type shaft commutator is set above the corner where the long side structure turns to the short side structure. The rotation speed of the long side shaft connecting rod is converted to the rotation speed of the short side shaft connecting rod at the same speed. The rotation speed of the shaft connecting rods in the two directions is controlled to be equal. Then, the worm gear screw mechanism is converted into lifting motion to realize the synchronous sinking or rising of the short side structure and the long side structure, thereby improving the overall motion reliability and stability of the device.

[0052] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0053] In the description of this application, the word "for example" is used to mean "used as an example, illustration, or description." Any embodiment described as "for example" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to make and use the invention. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that the invention can be made without using these specific details. In other instances, well-known structures and processes will not be described in detail to avoid obscuring the description of the invention with unnecessary detail. Therefore, the invention is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.

[0054] The above description is merely an embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of the present invention should be included within the scope of the claims of the present invention.

Claims

1. A side sealing device for a mobile factory building, characterized in that, The device includes: a long side structure, a short side structure, a lifting mechanism, a sealing strip, and a pulley gravity stiffness lifting assembly; The long side structure and the short side structure are perpendicularly connected, and the long side structure and the short side structure are respectively set at the bottom of two mutually perpendicular sides of the mobile factory building; The lifting mechanism is connected to the long side mechanism and / or the short side structure, and is used to drive the long side mechanism and / or the short side structure to move up and down relative to the mobile factory building; The sealing strip is disposed on the bottom surface of the long side structure and the short side structure; The pulley gravity stiffness lifting assembly is connected to the middle of the long side structure to provide an upward lifting force to the middle of the long side structure.

2. The side sealing device for a mobile factory building according to claim 1, characterized in that, The lifting mechanism includes: a lifting platform base, a drive motor, a reducer, a rotating shaft, and a first worm gear screw mechanism; The first worm gear screw mechanism includes: a first worm gear and a first screw; The drive motor is fixed on the elevator base, and the rotating shaft is connected to the output shaft of the drive motor through the reducer; The first worm gear is mounted on the rotating shaft, and the first worm gear moves synchronously with the rotating shaft; The first worm gear meshes with the first lead screw, and the rotation of the first worm gear drives the first lead screw to rise and fall. The bottom end of the first lead screw is connected to either the long side structure or the short side structure.

3. The side sealing device for a mobile factory building according to claim 2, characterized in that, The lifting mechanism also includes: a gear steering gear, a rotating shaft connecting rod, and a second worm gear screw mechanism; The second worm gear screw mechanism is connected to the rotating shaft via the gear axial device and the rotating shaft connecting rod.

4. The side sealing device for a mobile factory building according to claim 3, characterized in that, The second worm gear screw mechanism includes: a second worm gear and a second screw; The second worm gear is connected to the rotating shaft connecting rod, and the rotating shaft connecting rod and the second worm gear operate synchronously; The second lead screw is meshed with the second worm gear; The bottom end of the second lead screw is connected to either the long side structure or the short side structure.

5. The side sealing device for a mobile factory building according to claim 1, characterized in that, The pulley gravity stiffness lifting assembly includes: a fixed pulley, a structural fixing frame, a lifting ring, a steel cable, a guide rod, and a metal weight; The structural frame is fixedly connected to the mobile factory building; The fixed pulley is mounted on the structural fixing frame; The steel cable passes around the fixed pulley, with one end connected to the lifting ring and the other end connected to the metal weight. The metal weight is slidably connected to the guide rod.

6. The side sealing device for a mobile factory building according to claim 5, characterized in that, The guide rod is arranged vertically and is fixedly connected to the bottom end of the structural fixing frame.

7. The side sealing device for a mobile factory building according to claim 5, characterized in that, The fixed pulley includes a first fixed pulley and a second fixed pulley; The first fixed pulley and the second fixed pulley are spaced apart and located in the same horizontal plane.

8. The side sealing device for a mobile factory building according to claim 1, characterized in that, The inner wall of the long side structure and / or the short side structure is provided with a sliding groove in the vertical direction. The slide groove is slidably connected to a factory building fixed sliding bracket; The fixed sliding support of the factory building is fixedly connected to the mobile factory building.

9. The side sealing device for a mobile factory building according to claim 1, characterized in that, Both the long side structure and the short side structure use steel frames as the outer structural load-bearing bodies, and composite material plates are installed inside the structural frames.

10. The side sealing device for a mobile factory according to claim 9, characterized in that, Both the long side structure and the short side structure have structural frames at their top edges; The lifting mechanism is connected to the structural frame.

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