Mounting and fixing structure under special conditions
By designing an installation and fixing structural component that can be displaced under special conditions, and using the C-type clamp assembly to fix it with the base, the problem of lack of fixing holes under special conditions is solved, and the equipment is reliable installation and fixing is achieved.
Patent Information
- Application Number
- CN202510340347.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-21
- Publication Date
- 2025-05-09
AI Technical Summary
Under special conditions (such as ship deck), it is difficult to achieve reliable installation and fixation of the equipment because there are no fixing holes installed on the base or the holes cannot be used.
A mounting and fixing structural component is designed, which can be displaced vertically and horizontally in the base without mounting holes on the flange surface, and is fixed to the base through a C-type clamp assembly to ensure stable installation of the equipment.
It realizes reliable installation and fixation of the equipment under special conditions, solves the problem of lack of fixing holes on the base, and improves the reliability and stability of the installation.
Smart Images

Figure CN119957589A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of equipment installation and fixing structures under special conditions, and more particularly to an installation and fixing structure under special conditions. Background Art
[0002] However, when the base is installed under special conditions (such as ship decks) because there are no flange mounting holes or the mounting holes cannot be used, designing a special structure to achieve reliable installation and fixation of the equipment becomes a practical need to solve practical engineering applications.
[0003] The existing base without mounting holes is as follows Figure 1 As shown, there are no installation connection fixing holes on the flange surface of the installation fixing base. How to install and fix structural components on this base to achieve specific functions has become a research direction for technical personnel in this field. Summary of the invention
[0004] The purpose of the present invention is to provide an installation and fixing structure under special conditions, in order to solve the technical problems existing in the background technology.
[0005] In order to achieve the above object, the present invention adopts the following technical solutions:
[0006] An installation and fixing structure under special conditions, including:
[0007] An installation fixing structure component, wherein the installation fixing structure component is arranged in an installation fixing base having no installation holes on the flange surface;
[0008] The bottom of the mounting and fixing structure assembly can be displaced in the vertical and horizontal directions within the mounting and fixing base;
[0009] The top of the mounting and fixing structure assembly is used for mounting external devices;
[0010] A C-clip assembly is used to fix the mounting and fixing structure assembly and the mounting and fixing base.
[0011] In some embodiments, the mounting and fixing structure assembly includes:
[0012] The column weldment is a hollow structure; a plurality of symmetrically arranged first notches are formed on the column weldment;
[0013] A movable column weldment, wherein the movable column weldment is movably arranged at the bottom of the column weldment; a beveled conical surface is provided at the lower end of the movable column weldment;
[0014] A nut ring, wherein the nut ring is built into the hollow structure of the column weldment;
[0015] A rotating shaft, the rotating shaft is built into the column weldment, the rotating shaft is threadedly connected to the nut ring, the bottom of the rotating shaft is fixedly connected to the movable column weldment, and the top of the rotating shaft is opposite to the first notch; a plurality of pairs of plug interfaces are provided on the head of the rotating shaft;
[0016] The rotating shaft rod is used to be inserted into the plug interface through the first notch;
[0017] A slider, one end of the slider is provided with a bevel, and the other end is provided with a slider cover. The slider is arranged at the bottom of the column weldment through the end cover. The beveled conical surface provided at the lower end of the movable column weldment cooperates with the beveled conical surface of the slider. The rotation of the rotating shaft drives the axial movement of the movable column weldment, and drives the slider and the slider cover to move radially along the space formed by the end cover and the bottom of the column weldment, forming a tight fit with the inner wall of the mounting and fixing base.
[0018] In some embodiments, two rows of plug interfaces are provided on the head of the rotating shaft, and the two rows of plug interfaces are staggered with each other.
[0019] In some embodiments, the movable column welding piece has a plurality of inclined conical surfaces arranged in a circular array; the number of the sliders corresponds to the number of inclined conical surfaces of the movable column welding piece.
[0020] In some embodiments, the slider cover is fixed to the slider by screws; the slider cover is made of polytetrafluoroethylene.
[0021] In some embodiments, the C-clamp assembly includes a C-clamp, a screw and a nut. The screw passes through the C-clamp fixing hole of the column weldment. The flange surface of the mounting and fixing structure assembly is compressed by rotating the screw to form a clamping fixation with the lower end surface of the mounting and fixing base flange.
[0022] In some embodiments, an anti-reversal structure is also included, which includes a fixed shaft, a flat washer, a spring washer and a nut. The fixed shaft is inserted into the plug interface of the rotating shaft and is locked by the spring washer and the nut to limit the reversal of the rotating shaft.
[0023] In some embodiments, the head diameter of the fixed shaft is larger than the body diameter of the fixed shaft, the body diameter of the fixed shaft matches the diameter of the plug interface, and a through hole for passing a pull rope is provided on the head diameter of the fixed shaft.
[0024] Compared with the prior art, the present invention has the following beneficial effects:
[0025] The invention has novel structure and strong practicability, and solves the practical engineering application problem of installing and fixing structures under special conditions. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] Figure 1 It is a schematic diagram of installing a fixed base in the prior art;
[0027] Figure 2 Schematic diagram of installing the fixed structural components on the fixed base;
[0028] Figure 3 Installation and fixing of structural components schematic diagram;
[0029] Figure 4 Schematic diagram of column weldment structure;
[0030] Figure 5 Schematic diagram of the movable column weldment structure;
[0031] Figure 6 Schematic diagram of the shaft structure;
[0032] Figure 7 Schematic diagram of the nut ring structure;
[0033] Figure 8 Schematic diagram of the structure of the slider and the slider cover;
[0034] Fig. 9 Schematic diagram of the C-clip structure;
[0035] Fig.10 Schematic diagram of the rotating shaft rod structure;
[0036] Fig.11 Schematic diagram of the anti-rotation shaft reversal structure.
[0037] Illustration description: 1-install the fixed base, 2-install the fixed structure assembly, 3-C-clamp assembly, 4-rotating shaft rod, 5-column weldment, 6-movable column weldment, 7-rotating shaft, 8-nut ring, 9-slider, 10-slider cover, 11-end cover, 12-C-clamp, 13-screw, 14-nut, 15.Fixed shaft, 16-flat washer, 17-spring washer, 18-nut. DETAILED DESCRIPTION
[0038] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below in conjunction with the drawings in the preferred embodiments of the present application. In the drawings, the same or similar reference numerals throughout represent the same or similar parts or parts with the same or similar functions. The described embodiments are part of the embodiments of the present application, not all of the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.
[0039] The embodiments of the present application are described in detail below with reference to the accompanying drawings.
[0040] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0041] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are orientations or positional relationships based on the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.
[0042] In addition, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product, or display that includes a series of steps or elements is not necessarily limited to those steps or elements explicitly listed but may include other steps or elements not explicitly listed or inherent to such process, method, product, or display.
[0043] The following will be combined Figure 1-Figure 11 , a mounting and fixing structure under a special condition involved in the embodiment of the present application is described in detail. It is worth noting that the following embodiments are only used to explain the present application and do not constitute a limitation on the present application.
[0044] Embodiment 1:
[0045] See also Figure 1-11 As shown, an installation and fixing structure under special conditions includes: an installation and fixing structure component 2, a C-type clamp component 3, the installation and fixing structure component 2 is arranged in an installation and fixing base 1 with no installation holes on the flange surface; the bottom of the installation and fixing structure component 2 can generate displacement in the vertical direction and the horizontal direction in the installation and fixing base 1; the top of the installation and fixing structure component 2 is used to install an external device; the C-type clamp component 3 is used to fix the installation and fixing structure component 2 and the installation and fixing base 1.
[0046] Install the fixing base 1 Figure 1As shown, there is no flange for mounting and connecting fixing holes. The inner wall hole of the base is used, and the designed structure is fixed with the long hole axis of the inner wall hole of the base, and the fitting length is determined by H0. The designed structure has a radially adjustable diameter size to compensate for fitting errors and processing errors, so as to achieve the goal of tight fit with diameter D0, thereby improving reliability and reducing shaking.
[0047] By utilizing the upper flange plane of the mounting and fixing base 1, the design structure cooperates with the upper flange plane surface of the mounting and fixing base 1 to press and limit, thereby limiting the degree of freedom on this surface.
[0048] The degree of freedom fixed on the mounting base 1 is limited by two surfaces, one of which is a long hole; the friction force pressed on the contact between the two surfaces limits the rotation, and a rotation limiting structure is designed on the designed mounting structure to achieve complete fixation of the mounting structure.
[0049] In some embodiments, the mounting and fixing structure assembly 2 includes: a column weldment 5, a movable column weldment 6, a nut ring 8, a rotating shaft 7, a rotating shaft rod 4, and a slider 9. The column weldment 5 is a hollow structure; a plurality of symmetrically arranged first notches are provided on the column weldment 5; the movable column weldment 6 is movably arranged at the bottom of the column weldment 5; a beveled conical surface is provided at the lower end of the movable column weldment 6; the nut ring 8 is built into the hollow structure of the column weldment 5; the rotating shaft 7 is built into the column weldment 5, the rotating shaft 7 is threadedly connected to the nut ring 8, and the bottom of the rotating shaft 7 is fixedly connected to the movable column weldment 6, and the rotating shaft The top of 7 is opposite to the first notch; a plurality of pairs of plug-in interfaces are provided on the head of the rotating shaft 7; which are used to be plugged into the plug-in interface through the first notch; a bevel is provided at one end of the slider 9, and a slider cover 10 is provided at the other end. The slider 9 is arranged at the bottom of the column weldment 5 through the end cover 11, and the beveled conical surface provided at the lower end of the movable column weldment 6 cooperates with the beveled conical surface of the slider 9. The axial movement of the movable column weldment 6 is driven by the rotation of the rotating shaft 7, and the slider 9 and the slider cover 10 are driven to move radially along the space formed by the end cover 11 and the bottom of the column weldment 5, forming a tight fit with the inner wall of the mounting and fixing base 1.
[0050] The installation of the fixed structure component 2 and the fixed base 1 is as follows Figure 2 Show.
[0051] a) inserting the lower end of the mounting and fixing structure component 2 into the oblong hole of the mounting and fixing base 1;
[0052] b) rotating the shaft rod 4 by hand to perform circular motion, so that the radially-arranged slider 9 at the lower end of the fixed structure assembly 2 moves in the circumferential diameter direction, and the radially-arranged slider 9 generates radial pressure on the inner wall of the base of the oblong hole of the fixed base 1;
[0053] c) placing the lower end surface of the C-type clamp assembly 3 against the lower end surface of the flange of the mounting and fixing base 1, rotating the head of the screw rod 13 of the C-type clamp assembly 3, so that the screw rod 13 of the C-type clamp assembly 3 rotates, and the screw rod 13 of the C-type clamp assembly 3 presses down the flange surface of the mounting and fixing structure assembly 2 to clamp;
[0054] d) Movement path:
[0055] The rotational motion applied to the rotating shaft rod 4 → the linear motion generated on the rotating shaft 7 and the movable column weldment 6 → the radial linear motion generated on the slider 9 and the slider cover 10.
[0056] See also Figure 3 The installation and fixing structure assembly 2 is the main part of the entire structure, which is mainly assembled from a rotating shaft rod 4, a column weldment 5, a movable column weldment 6, a rotating shaft 7, a nut ring 8, a slider 9, a slider cover 10, an end cover 11, etc.
[0057] The column weldment 5 and the movable column weldment 6 are welded into two integral parts by combination welding, and then assembled with other parts to form the mounting and fixing structure assembly 2. Except for the slider cover 10 which is made of polytetrafluoroethylene, the other parts are made of metal materials.
[0058] First, install the nut ring 8 into the column weldment 5 and fix it;
[0059] Then, the screw rod 13 of the rotating shaft 7 passes through the nut ring 8 and is connected to the movable column weldment 6 as a whole;
[0060] The lower end surface of the movable column welding piece 6 is designed to be an inclined cone, and the joint surface between the slider 9 and the lower end surface of the movable column welding piece 6 is designed to be an inclined cone, and the two parts are assembled in pairs;
[0061] The slider cover 10 is made of polytetrafluoroethylene. When the slider cover 10 moves in the radial direction to press the inner wall of the base, the self-lubricating property of polytetrafluoroethylene is used to reduce sliding friction. Polytetrafluoroethylene is a plastic that can be slightly deformed and can fit tightly with the inner surface of the mounting and fixing base 1.
[0062] Finally, the end cover 11 is installed to close the seal, forming two sliding surfaces. One sliding surface is the joint surface between the slider 9 and the lower end surface of the movable column weldment 6, and the other sliding surface is the joint surface between the slider 9 and the end cover 11. The joint surface between the slider cover 10 and the lower end surface of the movable column weldment 6, and the joint surface between the slider cover 10 and the end cover 11 are two self-lubricating sliding surfaces.
[0063] After the rotating shaft rod 4 is rotated, the rotating shaft 7 rotates, and the movable column welding piece 6 moves up and down, thereby the slider 9 and the slider cover 10 move radially, applying and releasing pressure in the radial direction.
[0064] The column weldment 5 is welded together by combining multiple metal parts into an integral component, and is subjected to correction treatment after welding. After surface treatment, it is assembled with other parts to form an installation and fixing structure component 2.
[0065] See also Figure 4 The flange D2 of the column weldment 5 is the mating surface with the flange of the mounting and fixing base 1, and the fixing hole of the C-type clamp 12 is the flange surface of the C-type clamp 12 screw 13 pressing down the mounting and fixing structure component 2 for clamping and fixing, and is also the positioning hole of the C-type clamp component 3. The fixing hole of the C-type clamp 12 is a countersunk step blind hole.
[0066] The flange D3 of the column weldment 5 is a mounting surface for external mounting equipment, and the flange D4 of the column weldment 5 is a mounting hole for external mounting equipment.
[0067] The first notch formed on the round tube of the column weldment 5 is an operating space for inserting the shaft rod 4 into the rotation, and can also facilitate the wiring of external devices to be led out from the round tube of the column weldment 5.
[0068] See also Figure 5 The movable column weldment 6 is welded together by multiple metal parts into an integral component, and is corrected after welding. After the surface treatment is completed, it is assembled with other parts to form an installation and fixing structure component 2.
[0069] The diameter D5 of the movable column weldment 6 is the thread size for matching with the rotating shaft 7. After the rotating shaft 7 is screwed into D5, the thread glue is applied and solidified into one body, so that the movable column weldment 6 and the rotating shaft 7 can rotate together in the same direction. The sliding matching inclined surface of the movable column weldment 6 is the sliding matching surface with the slider 9.
[0070] See also Figure 6 The shaft 7 is a shaft-like part, and the threaded part of the shaft 7 is threaded to match the internal thread of the nut ring 8 and the movable column weldment 6. The thread of the shaft 7 is a fine pitch thread to prevent retreat. The diameter D6 surface has two rows of plug-in interfaces, which are convenient for the shaft rod 4 to be inserted and rotated. The two rows of plug-in interfaces form staggered openings to facilitate adjustment at any angle.
[0071] See also Figure 7 The nut ring 8 is a motion transmission carrier for installing and fixing the structural component 2 to realize the circular rotation motion starting from the rotating shaft rod 4 into the radial linear motion of the slider 9 and the slider cover 10.
[0072] The diameter D7 of the nut ring 8 matches the inner diameter of the round tube of the column weldment 5. The external screw passes through the opening at the corresponding position of the round tube of the column weldment 5 and is connected to the screw hole of the nut ring 8n-M1 to fix the nut ring 8.
[0073] The thread M of the nut ring 8 is a thread matching the rotating shaft 7, and the rotating shaft 7 can rotate through the thread.
[0074] See also Figure 8The slider 9 and the slider cover 10 are important functional components for realizing radial linear motion. The slider 9 and the slider cover 10 are embedded in the corresponding positions of the movable column weldment 6. A strip hole is designed in each slider 9, and the pin passes through the slider 9. The slider 9 can only make reciprocating linear motion, and the range of motion is determined by the size of the slider 9 strip hole.
[0075] The slider cover 10 is fixed on the slider 9 by screws. The slider cover 10 is made of polytetrafluoroethylene, which is a plastic material and has the characteristics of self-lubricity and slight deformation, so as to better realize the functionality of the mounting and fixing structure component 2.
[0076] Through the downward linear motion of the movable column welding piece 6, the inclined surface on the movable column welding piece 6 presses the inclined surface of the slider 9 downward, pushing the slider 9 outward, generating an outward radial linear motion.
[0077] When the movable column welding part 6 moves linearly upward, the force applied to the inclined surface of the slider 9 is unloaded, and the reaction force of the inner wall of the fixed base 1 facing the slider cover 10 pushes the slider 9 inward, and the slider 9 produces inward radial linear motion.
[0078] The end cover 11 is a functional structural part for facilitating the assembly of the slider 9 and the slider cover 10. The inner surface of the end cover 11 is the inner surface that slides with the slider 9 and the slider cover 10. The inner surface of the sliding fit is coated with yellow grease to increase lubricity.
[0079] See also Fig. 9 The C-clip assembly 3 is mainly composed of a C-clip 12, a screw 13, a nut 14, etc. The clamping surface 2 of the C-clip 12 is against the lower end surface of the flange of the mounting and fixing base 1. The screw 13 of the C-clip assembly 3 passes through the internal thread of the C-clip 12. The head of the screw 13 of the C-clip assembly 3 is rotated, and the screw 13 of the C-clip assembly 3 moves downward in the vertical direction. The screw 13 of the C-clip assembly 3 presses down the flange surface of the mounting and fixing structure assembly 2, and the clamping surface 1 of the C-clip 12 is engaged with the flange surface of the mounting and fixing structure assembly 2 for clamping. The spacing of the screws 13 of the C-clip assembly 3 is equal to the spacing of the fixing holes of the C-clip 12 on the flange D2 of the column weldment 5. The fixing holes of the C-clip 12 on the flange D2 of the column weldment 5 are also the clamping fixing holes of the C-clip assembly 3. Two nuts 14 are designed on the screw 13 of the C-clip assembly 3 as a measure to prevent the screw 13 from loosening.
[0080] See also Fig.10 The shaft rod 4 is a component for applying rotational force externally. The shaft rod 4 can be inserted into the upper and lower rows of plug-in interfaces of the shaft 7 with a diameter D6 to perform rotational movement.
[0081] See also Fig.11In order to prevent the rotating shaft 7 from reversing after the external force applied to the rotating shaft rod 4 is removed, it is of engineering significance to design an anti-reversal structure. The anti-reversal structure includes a fixed shaft, a flat washer, a spring washer and a nut. The fixed shaft is inserted into the plug interface of the rotating shaft 7 and is locked by the spring washer and the nut to limit the reversal of the rotating shaft 7.
[0082] After the rotating shaft 7 is rotated into place, the threaded rod of the fixed shaft is inserted into the circular hole of the rotating shaft 7, and the larger end of the fixed shaft contacts the side wall of the opening of the installation fixing structure component 2. The joint surface between the side wall and the fixed shaft is used to limit and prevent the rotating shaft 7 from reversing. The threaded rod of the fixed shaft passes through the exposed part of the rotating shaft 7 and is tightened with flat washers, spring washers and nuts in sequence.
[0083] In some embodiments, the head diameter of the fixed shaft is larger than the shaft body diameter of the fixed shaft, the shaft body diameter of the fixed shaft is matched with the diameter of the plug interface, and a through hole for passing a pull rope is provided on the head diameter of the fixed shaft. If after the fixed shaft is installed, the large diameter section of the head of the fixed shaft does not contact the side wall of the first notch of the column weldment 5 or the distance between the two is far, then anti-reversal can be achieved by passing a rope through the head through holes of the fixed shaft arranged on opposite sides and then tying it.
[0084] The bottom end cover 11 of the mounting and fixing structure assembly 2 can be opened, so that the slider 9, the slider cover 10 and other structures can be repaired and replaced.
[0085] Except for the slider cover 10 which is made of polytetrafluoroethylene plastic, the other parts are made of metal materials. The internal metal material adopts the electroplating process, and the exposed metal surface of the structure adopts the painting process to improve the aesthetics and corrosion resistance. All mounting screws are made of stainless steel 304 or 31615. Fixed shaft screw.
[0086] It can solve the problem of equipment installation and fixing structure under special conditions in engineering applications, and at the same time meet the requirements of equipment protection against salt spray, mildew, humidity, heat, rain, and water splash, and has a structure with high wind resistance.
[0087] The above description is only a preferred embodiment of the present invention and is used to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims
1. An installation and fixing structure under special conditions, characterized in that: include: An installation fixing structure component, wherein the installation fixing structure component is arranged in an installation fixing base having no installation holes on the flange surface; The bottom of the mounting and fixing structure assembly can be displaced in the vertical and horizontal directions within the mounting and fixing base; The top of the mounting and fixing structure assembly is used for mounting external devices; A C-clip assembly is used to fix the mounting and fixing structure assembly and the mounting and fixing base.
2. The installation and fixing structure under special conditions according to claim 1, characterized in that: The installation and fixing structure assembly comprises: The column weldment is a hollow structure; a plurality of symmetrically arranged first notches are formed on the column weldment; A movable column weldment, wherein the movable column weldment is movably arranged at the bottom of the column weldment; a beveled conical surface is provided at the lower end of the movable column weldment; A nut ring, wherein the nut ring is built into the hollow structure of the column weldment; A rotating shaft, the rotating shaft is built into the column weldment, the rotating shaft is threadedly connected to the nut ring, the bottom of the rotating shaft is fixedly connected to the movable column weldment, and the top of the rotating shaft is opposite to the first notch; a plurality of pairs of plug interfaces are provided on the head of the rotating shaft; The rotating shaft rod is used to be inserted into the plug interface through the first notch; A slider, one end of the slider is provided with a bevel, and the other end is provided with a slider cover. The slider is arranged at the bottom of the column weldment through the end cover. The beveled conical surface provided at the lower end of the movable column weldment cooperates with the beveled conical surface of the slider. The rotation of the rotating shaft drives the axial movement of the movable column weldment, and drives the slider and the slider cover to move radially along the space formed by the end cover and the bottom of the column weldment, forming a tight fit with the inner wall of the mounting and fixing base.
3. The installation and fixing structure under special conditions according to claim 2, characterized in that: Two rows of plug interfaces are arranged on the head of the rotating shaft, and the two rows of plug interfaces are arranged in a staggered manner with respect to each other.
4. The installation and fixing structure under special conditions according to claim 2, characterized in that: The movable column welding piece has a plurality of inclined conical surfaces arranged in a circular array; the number of the sliding blocks corresponds to the number of inclined conical surfaces of the movable column welding piece.
5. The installation and fixing structure under special conditions according to claim 2, characterized in that: The slider cover is fixed on the slider by screws; the slider cover is made of polytetrafluoroethylene.
6. The installation and fixing structure under special conditions according to claim 1, characterized in that: The C-clip assembly comprises a C-clip, a screw and a nut. The screw passes through the C-clip fixing hole of the column weldment. The flange surface of the mounting and fixing structure assembly is pressed by rotating the screw to form a clamping fixation with the lower end surface of the mounting and fixing base flange.
7. The installation and fixing structure under special conditions according to claim 2, characterized in that: It also includes an anti-reversal structure, which includes a fixed shaft, a flat washer, a spring washer and a nut. The fixed shaft is inserted into the plug interface of the rotating shaft and is locked by the spring washer and the nut to limit the reversal of the rotating shaft.
8. The installation and fixing structure under special conditions according to claim 7, characterized in that: The head diameter of the fixed shaft is larger than the shaft body diameter of the fixed shaft, the shaft body diameter of the fixed shaft is matched with the diameter of the plug interface, and a through hole for passing a pull rope is opened on the head diameter of the fixed shaft.