A bevel press line structure having a closed cavity

Abstract

The application discloses a bevel line pressing structure with a closed cavity and relates to the technical field of bevel line pressing, which comprises a bevel frame body, the bevel frame body is adapted to be arranged on a top of a window frame profile and is provided with a closed cavity along the length direction of the bevel frame body, a first baffle is fixedly connected to the bottom of the outer side wall of the bevel frame body, and the bottom surface of the first baffle is provided with a matching surface which is matched with the shape of the outer side edge of the window frame profile. The closed cavity is integrally arranged in the bevel frame body, the linkage control assembly, the locking assembly and the sealing assembly are hidden in the closed cavity, the overall bending stiffness and the structural strength of the bevel line pressing structure are improved, the deformation under strong wind pressure is effectively resisted, the internal precise mechanical transmission components are effectively protected from the external environment, and the appearance is kept smooth and beautiful.

Description

Technical Field

[0001] This invention relates to the field of inclined surface pressing technology, specifically an inclined surface pressing structure with a closed cavity. Background Technology

[0002] In modern building window and door systems, the glazing bead structure, as a key component connecting the window frame and glass, primarily undertakes the important functions of fixing the glass, withstanding wind pressure, and ensuring the airtightness and watertightness of the windows and doors. Traditional glazing bead designs mostly employ open or semi-closed profile structures, combined with snap-fit ​​or screw connections, to achieve the clamping of the glass edges and closure of the window frame. As the construction industry's requirements for window and door performance increase, glazing bead structure designs are gradually developing towards higher rigidity, higher sealing performance, and aesthetics, giving rise to various glazing bead profiles with complex cross-sections and composite functions.

[0003] However, while the current closed-beveled pressure line simplifies the initial installation process by directly snapping it onto the window frame profile, this connection method, which relies solely on elastic clips, has significant limitations in long-term use. These limitations are mainly manifested in the fact that the locking force after snapping is fixed and cannot be adjusted, making it difficult to adapt to the compression requirements of glass of different thicknesses or sealing strips. Furthermore, it is prone to loosening under continuous strong wind pressure and vibration. At the same time, the existing snap-fit ​​structure often only achieves mechanical connection and cannot synchronously drive the pressure line to apply additional pressure and sealing force to the glass. As a result, the actual sealing effect is limited by the manufacturing precision of the profile itself, and there is a lack of space for further tightening and adjustment after installation. Summary of the Invention

[0004] The purpose of this invention is to provide a sloping pressure line structure with a closed cavity to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a sloped pressure line structure with a closed cavity, comprising: The inclined frame is adapted to be fitted into the pre-set pressure groove at the top of the window frame profile, and the interior of the inclined frame has an integrally constructed closed cavity along its length. The first baffle is fixedly connected to the bottom of the outer wall of the inclined frame, and the bottom surface of the first baffle is a fitting surface that is adapted to the shape of the outer edge of the window frame profile. The second baffle is fixedly connected to the inner wall of the inclined frame, and the edge of the second baffle is configured as a contact surface that fits tightly against the inner surface of the glass. A sealing assembly is movably disposed within the space formed between the inclined frame and the second baffle, for driving the second baffle to move toward the glass to improve the sealing between the two; A locking assembly is retractably disposed on the bottom side of the inclined frame, and is used to embed into the pressure groove in the locked state to fix the inclined frame; A linkage control component is located in the upper middle part of the closed cavity, used to synchronously drive the sealing component to perform a pressing and sealing action and drive the locking component to perform a locking and fixing action.

[0006] Furthermore, the wire groove includes: The outer edge protrudes from the outer edge of the top of the window frame profile, and its cross-sectional shape is L-shaped, used to provide outer limit; The inner edge protrudes from the inner edge of the top of the window frame profile. Its cross-sectional shape is L-shaped, and it is used to cooperate with the outer edge to form a snap-fit ​​space.

[0007] Furthermore, the inclined frame includes: The inclined body extends downward from the outside to the inside, with its outer edge integrally formed with the first baffle and its inner edge integrally formed with the second baffle. The outer cavity edge extends vertically downward from the bottom side of the inclined body and is disposed adjacent to the first baffle. The inner cavity edge extends vertically downward from the bottom side of the inclined body and is disposed adjacent to the glass; The bottom edge of the cavity is horizontally connected between the bottom end of the outer cavity edge and the bottom end of the inner cavity edge to jointly enclose and form the closed cavity.

[0008] Furthermore, the inclined frame also includes: An external buckle protrudes from the bottom surface of the outer cavity edge, and the external buckle is configured to elastically engage with the outer side guard. An inner buckle protrudes from the bottom surface of the inner cavity edge and is configured to elastically engage with the inner side guard.

[0009] Furthermore, the sealing assembly includes: The guide rod slides horizontally through the edge of the inner cavity; The push plate has an L-shaped structure and is fixedly connected to one end of the guide rod located outside the closed cavity, with the extension of the push plate facing towards the glass. A sealing sheet is fixedly connected to the bottom end face of the second baffle. The outer surface of the sealing sheet is constructed to form a sealing surface that fits against the inner surface of the glass. The inner surface of the sealing sheet abuts against the end face of the extension of the push plate. The sealing sheet has several sealing strips fixedly connected to the surface of the side closest to the glass to enhance the water resistance and airtightness of the contact surface.

[0010] Furthermore, the sealing assembly also includes: A return spring is coaxially sleeved on the outer periphery of the guide rod. One end of the return spring abuts against the side wall of the inner cavity, and the other end abuts against the side wall of the push plate, and is used to provide the push plate with an elastic return force away from the glass.

[0011] Furthermore, the locking assembly includes: The first locking bar has an L-shaped structure, with its vertical part sliding through a guide groove opened on the side of the bottom cavity, and its horizontal part extending to the bottom of the bottom cavity. The second locking bar has an L-shaped structure. Its vertical part slides through the guide groove two opened on the side of the bottom cavity, and its horizontal part extends to the bottom of the bottom cavity. The top of the vertical part of the second locking bar is fixedly connected to the end of the guide rod away from the push plate. A return spring is disposed within the closed cavity. One end of the return spring is fixedly connected to the inner sidewall of the outer cavity, and the other end is fixedly connected to the vertical part of the first locking bar. It is used to provide a restoring force to the first locking bar to disengage from the locking position.

[0012] Furthermore, the free end of the horizontal portion of the first locking bar engages with the inner wall of the outer sidewall; The free end of the horizontal portion of the second locking bar engages with the inner wall of the inner side stop. The top wall of the closed cavity has an operating window that extends through its thickness, and a triangular support block for supporting the linkage control component is fixedly connected to the inner side of the operating window.

[0013] Furthermore, the linkage control component includes: A control rod is vertically mounted and threaded into the threaded hole of the triangular support block. The bottom end of the control rod extends into the closed cavity, and the lower section of the control rod moves through the edge of the bottom cavity. A control frustum is coaxially fixedly connected to one end of the control rod that extends into the closed cavity; The bottom periphery of the control frustum abuts against the top first driving inclined surface of the vertical part of the first locking bar, and the bottom periphery of the control frustum abuts against the second driving inclined surface of the end of the guide rod.

[0014] Furthermore, a positioning hole is recessed at the center of the bottom wall of the pressure groove. The positioning hole is configured to accommodate the bottom end of the control rod in the locked state to assist in positioning. The end face of the control lever away from the control platform has an internal hexagonal hole for external tools to drive its rotation. A sealing baffle is detachably engaged at the opening of the operation window. The sealing baffle is configured to cover the control lever after installation to maintain a consistent appearance.

[0015] Compared with the prior art, this inclined pressure line structure with a closed cavity has the following advantages: I. This invention constructs a closed cavity integrally inside the inclined frame, and integrates and hides the linkage control component, locking component and sealing component inside the closed cavity. This not only improves the overall bending stiffness and structural strength of the inclined pressure line structure and effectively resists deformation under strong wind pressure, but also effectively protects the internal precision mechanical transmission components from external environmental corrosion, while maintaining the flatness and aesthetics of the appearance.

[0016] Second, this invention uses the control frustum in the linkage control assembly to simultaneously press the first driving inclined surface of the first locking bar and the second driving inclined surface of the guide rod. By simply rotating the control rod, the rotational motion can be synchronously converted into the lateral locking displacement of the first and second locking bars and the pressing and sealing displacement of the guide rod, realizing the integrated operation of mechanical locking and sealing pressing, simplifying the installation steps and improving construction efficiency.

[0017] Third, this invention provides a sealing sheet and sealing strip driven by a guide rod and a push plate at the bottom of the second baffle, and uses a linkage control component to provide continuous and stable thrust, so that the pressure line structure can actively compensate for gaps caused by manufacturing tolerances or installation errors, ensuring that the sealing strip is always in close contact with the glass surface with appropriate pressure, thereby improving the air tightness, water tightness and sound insulation of doors and windows. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the first cross-sectional structure of the present invention; Figure 3 This is a schematic diagram of the second cross-sectional structure of the present invention; Figure 4 This is a schematic diagram of the exploded structure of the present invention; Figure 5 This is a schematic diagram of the assembly structure of the various components of the present invention; Figure 6 This is a schematic diagram of the inclined frame and window frame profile structure of the present invention.

[0019] In the diagram: 1. Sloping frame; 101. Sloping body; 102. Outer cavity edge; 103. Inner cavity edge; 104. Bottom cavity edge; 105. Outer buckle; 106. Inner buckle; 2. Window frame profile; 3. Pressure groove; 301. Outer side guard; 302. Inner side guard; 4. Closed cavity; 5. First baffle; 6. Second baffle; 7. Sealing assembly; 701. Guide rod; 702. Push plate; 703. Sealing plate; 704. Return spring 8. Locking assembly; 801. First locking bar; 802. Second locking bar; 803. Return spring; 9. Linkage control assembly; 901. Control lever; 902. Control frustum; 10. Glass; 11. Sealing strip; 12. Guide groove one; 13. Guide groove two; 14. Operating window; 15. Triangular support block; 16. First driving inclined surface; 17. Second driving inclined surface; 18. Positioning hole; 19. Internal hexagonal hole; 20. Sealing baffle. Detailed Implementation

[0020] 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. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] like Figure 1-6 As shown, the present invention provides a technical solution: a sloping pressure line structure with a closed cavity. This device is mainly used in building door and window systems. It is installed as a whole in the pressure line groove 3 at the top of the window frame profile 2, and is used to press, fix and seal the glass 10 installed on the window frame. One of the core advantages of this device is that through the internal linkage mechanism, the pressing and sealing of the glass 10 and the mechanical locking of the window frame are carried out simultaneously, which simplifies the installation process and improves the construction efficiency. At the same time, the closed cavity structure improves the overall rigidity and wind pressure resistance of the pressure line. The structure mainly includes a sloping frame 1, a first baffle 5, a second baffle 6, a sealing component 7, a locking component 8 and a linkage control component 9.

[0022] The beveled frame 1 is elongated and is fitted into the pre-set pressure groove 3 at the top of the window frame profile 2 via a snap-fit ​​structure at its bottom. This structure allows the beveled frame 1 to be securely installed along the edge of the window frame. The interior of the beveled frame 1 has an integrally constructed closed cavity 4 along its length. This closed cavity 4 not only provides concealed installation space for the internal control and transmission mechanism, protecting it from external environmental corrosion, but also enhances the bending strength of the profile through its hollow structure. A first baffle 5 is fixedly connected to the bottom of the outer side wall of the beveled frame 1. The bottom surface of the first baffle 5... The beveled frame 1 is designed to fit the shape of the outer edge of the window frame profile 2, covering the gaps in the profile splicing and assisting in positioning. A second baffle 6 is fixedly connected to the inner wall of the beveled frame 1. The edge of the second baffle 6 is designed to be a contact surface that fits tightly against the inner side of the glass 10. It is the main force-bearing component that directly acts on the glass 10. A sealing component 7 and a locking component 8 are also provided on the beveled frame 1, which are used to perform the pressing and sealing and the fixing and locking actions, respectively. The linkage control component 9 located in the upper part of the beveled frame 1 is responsible for coordinating and driving the above two components.

[0023] The pressure groove 3 on the window frame profile 2 includes an outer side flange 301 protruding from its top outer edge and an inner side flange 302 protruding from its top inner edge. Both have an L-shaped cross-section and cooperate to form a snap-fit ​​space for accommodating the bottom of the sloping frame 1. The sloping frame 1 specifically includes a sloping body 101 extending downward from the outside to the inside. This sloping design can improve structural stability by utilizing the sloping force component when subjected to positive wind pressure. The outer edge of the sloping body 101 is integrally formed with the first baffle 5, and the inner edge is integrally formed with the second baffle 5. The sheet 6 is integrally formed, with an outer cavity edge 102 and an inner cavity edge 103 extending vertically downward from the bottom side of the inclined body 101. They are respectively located adjacent to the first baffle 5 and the glass 10. The bottom cavity edge 104 is horizontally connected between the bottom of the outer cavity edge 102 and the inner cavity edge 103, thereby jointly enclosing and forming the closed cavity 4. In order to achieve preliminary installation, the bottom surface of the outer cavity edge 102 is provided with an outer buckle 105 that elastically engages with the outer baffle 301, and the bottom surface of the inner cavity edge 103 is provided with an inner buckle 106 that elastically engages with the inner baffle 302.

[0024] The sealing assembly 7 is key to achieving a high-quality seal in this application. It is movably disposed within the space formed between the inclined frame 1 and the second baffle 6, and is used to drive the second baffle 6 to move towards the glass 10 to improve the sealing between them. The assembly includes a guide rod 701 that slides horizontally through the inner cavity edge 103. One end of the guide rod 701 located outside the closed cavity 4 is fixedly connected to an L-shaped push plate 702. The extension of the push plate 702 is positioned towards the glass 10. A sealing sheet 703 is fixedly connected to the bottom surface of the second baffle 6. The outer surface of the sealing sheet 703 is configured as a sealing surface that fits against the inner surface of the glass 10, and its inner surface is... The extension end face of the push plate 702 abuts against the surface of the sealing sheet 703 close to the glass 10, and several sealing strips 11 are fixedly connected in an array. They are usually made of EPDM rubber to enhance the water resistance and airtightness of the contact surface. When the guide rod 701 moves horizontally, it drives the push plate 702 to push the sealing sheet 703 and the sealing strips 11 to press tightly against the glass 10. In order to cooperate with the action, the sealing assembly 7 also includes a return spring 704 coaxially sleeved on the outer periphery of the guide rod 701. One end of the spring abuts against the side wall of the inner cavity edge 103, and the other end abuts against the side wall of the push plate 702. It is used to provide the push plate 702 with an elastic return force away from the glass 10, so as to facilitate automatic rebound when disassembling.

[0025] The locking assembly 8 is telescopically mounted on the bottom side of the inclined frame 1, and is used to embed into the pressure groove 3 in the locked state to firmly fix the inclined frame 1. The assembly includes a first locking bar 801 and a second locking bar 802, both of which are L-shaped. A guide groove 12 and a guide groove 13 are respectively opened on the bottom cavity edge 104. The vertical part of the first locking bar 801 slides through the guide groove 12, and its horizontal part extends to the bottom cavity edge 104; the vertical part of the second locking bar 802 slides through the guide groove. The second locking bar 802 has a horizontal portion that extends below the bottom cavity edge 104. In particular, the top of the vertical portion of the second locking bar 802 is fixedly connected to the end of the guide rod 701 away from the push plate 702, thereby linking the locking action with the sealing action. In addition, a return spring 803 is provided in the closed cavity 4, one end of which is fixedly connected to the inner side wall of the outer cavity edge 102, and the other end is fixedly connected to the vertical portion of the first locking bar 801, for providing a restoring force to the first locking bar 801 to disengage from the locking position.

[0026] The linkage control component 9 is located in the upper middle part of the closed cavity 4. The top cavity wall of the closed cavity 4 has an operation window 14 that extends through its thickness. A triangular support block 15 for supporting the linkage component is fixedly connected to the inner side of the operation window 14. The linkage control component 9 includes a vertically arranged control rod 901 that is threaded into the threaded hole of the triangular support block 15. Its bottom end extends into the closed cavity 4, and its top end protrudes from the operation window 14. A control frustum 902 is coaxially fixedly connected to one end of the control rod 901 that extends into the closed cavity 4. The bottom periphery of the control frustum 902 is machined with driving slopes, which respectively abut against the first driving slope 16 at the top of the vertical part of the first locking bar 801 and the second driving slope 17 at the end of the guide rod 701.

[0027] Working process: First, place the inclined frame 1 on the pressure groove 3 of the window frame profile 2, and pre-position it using the outer buckle 105 and inner buckle 106. Then, insert an Allen wrench into the Allen hole 19 at the top of the control rod 901 and rotate the control rod 901. The control rod 901 moves downward under the action of the thread, driving the control platform 902 to press down. The inclined surface of the bottom of the control platform 902 simultaneously presses the driving inclined surface on the first locking bar 801 and the guide rod 701. Under the guidance of the inclined surface, the first locking bar 801 is driven to move horizontally outward, so that its horizontal free end is engaged with the inner side wall of the outer edge 301; at the same time, the guide rod 701... The driven horizontal inward movement causes the second locking bar 802 to move horizontally inward, so that its free end of the horizontal part is engaged in the inner wall of the inner side flange 302. During this process, the movement of the guide rod 701 also drives the push plate 702 to squeeze the sealing plate 703, so that the sealing strip 11 is pressed tightly against the surface of the glass 10. When the bottom end of the control rod 901 is inserted into the positioning hole 18 on the bottom wall of the pressure groove 3, the locking limit is reached. Finally, the sealing baffle 20 is engaged at the operation window 14 to block it, and the installation is completed. The whole process is completed by rotating a control rod 901, which simultaneously completes the mechanical locking of the inner and outer sides and the sealing and pressing in the middle. The operation is simple and the connection is reliable.

[0028] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A sloped pressure line structure with a closed cavity, characterized in that, include: The inclined frame (1) is adapted to be installed in the pre-set pressure groove (3) on the top of the window frame profile (2), and the interior of the inclined frame (1) has an integrally constructed closed cavity (4) along its length direction. The first baffle (5) is fixedly connected to the bottom of the outer wall of the inclined frame (1), and the bottom surface of the first baffle (5) is a fitting surface that is adapted to the shape of the outer edge of the window frame profile (2). The second baffle (6) is fixedly connected to the inner wall of the inclined frame (1), and the edge of the second baffle (6) is configured as a contact surface that is tightly fitted to the inner side of the glass (10); The sealing assembly (7) is movably disposed in the space formed between the inclined frame (1) and the second baffle (6) for driving the second baffle (6) to move toward the glass (10) to improve the sealing between the two. The locking assembly (8) is retractably disposed on the bottom side of the inclined frame (1) and is used to embed the pressure groove (3) in the locked state to fix the inclined frame (1); The linkage control component (9) is located in the upper middle part of the closed cavity (4) and is used to synchronously drive the sealing component (7) to perform the pressing and sealing action and drive the locking component (8) to perform the locking and fixing action.

2. The inclined pressure line structure with a closed cavity according to claim 1, characterized in that, The wire groove (3) includes: The outer edge (301) protrudes from the outer edge of the top of the window frame profile (2), and its cross-sectional shape is L-shaped, which is used to provide an outer limit; The inner side guard (302) protrudes from the inner edge of the top of the window frame profile (2), and its cross-sectional shape is L-shaped, which is used to cooperate with the outer side guard (301) to form a snap-fit ​​space.

3. The inclined pressure line structure with a closed cavity according to claim 1, characterized in that, The inclined frame (1) includes: The inclined body (101) extends downward from the outside to the inside, its outer edge is integrally formed with the first baffle (5), and its inner edge is integrally formed with the second baffle (6). The outer cavity edge (102) extends vertically downward from the bottom side of the inclined body (101) and is disposed adjacent to the first baffle (5); The inner cavity edge (103) extends vertically downward from the bottom side of the inclined body (101) and is disposed adjacent to the glass (10); The bottom cavity edge (104) is horizontally connected between the bottom end of the outer cavity edge (102) and the bottom end of the inner cavity edge (103) to jointly enclose and form the closed cavity (4).

4. The inclined pressure line structure with a closed cavity according to claim 3, characterized in that, The inclined frame (1) also includes: An outer buckle (105) protrudes from the bottom surface of the outer cavity edge (102), and the outer buckle (105) is configured to elastically engage with the outer side guard (301); An inner buckle (106) protrudes from the bottom surface of the inner cavity edge (103) and is configured to elastically engage with the inner side guard (302).

5. The inclined pressure line structure with a closed cavity according to claim 3, characterized in that, The sealing assembly (7) includes: The guide rod (701) slides horizontally through the inner cavity edge (103). The push plate (702) has an L-shaped structure and is fixedly connected to one end of the guide rod (701) located outside the closed cavity (4), and the extension of the push plate (702) is arranged in a direction close to the glass (10); A sealing sheet (703) is fixedly connected to the bottom end face of the second baffle (6). The outer surface of the sealing sheet (703) is constructed to form a sealing surface that fits against the inner surface of the glass (10). The inner surface of the sealing sheet (703) abuts against the end face of the extension of the push plate (702). Among them, the sealing sheet (703) has several sealing strips (11) fixedly connected to one side surface of the glass (10) to enhance the water resistance and airtightness of the contact surface.

6. The inclined pressure line structure with a closed cavity according to claim 5, characterized in that, The sealing assembly (7) further includes: A reset spring (704) is coaxially sleeved on the outer periphery of the guide rod (701). One end of the reset spring (704) abuts against the side wall of the inner cavity edge (103), and the other end abuts against the side wall of the push plate (702). It is used to provide the push plate (702) with an elastic reset force away from the glass (10).

7. The inclined pressure line structure with a closed cavity according to claim 5, characterized in that, The locking assembly (8) includes: The first locking bar (801) has an L-shaped structure, with its vertical part sliding through the guide groove (12) opened on the bottom cavity edge (104), and its horizontal part extending to the bottom cavity edge (104). The second locking bar (802) has an L-shaped structure. Its vertical part slides through the guide groove (13) opened on the bottom cavity edge (104), and its horizontal part extends to the bottom cavity edge (104). The top of the vertical part of the second locking bar (802) is fixedly connected to the end of the guide rod (701) away from the push plate (702). A return spring (803) is disposed in the closed cavity (4). One end of the return spring (803) is fixedly connected to the inner side wall of the outer cavity edge (102), and the other end is fixedly connected to the vertical part of the first locking bar (801). It is used to provide a restoring force to the first locking bar (801) to disengage from the locking position.

8. The inclined pressure line structure with a closed cavity according to claim 7, characterized in that: The free end of the horizontal portion of the first locking bar (801) engages with the inner wall of the outer sidewall (301); The free end of the horizontal portion of the second locking bar (802) engages with the inner wall of the inner side stop (302); The top cavity wall of the closed cavity (4) is provided with an operation window (14) that extends through its thickness, and a triangular support block (15) for supporting the linkage control component (9) is fixedly connected to the inner side of the operation window (14).

9. The inclined pressure line structure with a closed cavity according to claim 8, characterized in that, The linkage control component (9) includes: The control rod (901) is vertically set and threadedly connected to the threaded hole of the triangular support block (15). The bottom end of the control rod (901) extends into the closed cavity (4), and the lower section of the control rod (901) moves through the bottom cavity edge (104). A control frustum (902) is coaxially fixedly connected to one end of the control rod (901) that extends into the closed cavity (4); The bottom periphery of the control frustum (902) abuts against the top first driving inclined surface (16) of the vertical part of the first lock bar (801), and the bottom periphery of the control frustum (902) abuts against the second driving inclined surface (17) at the end of the guide rod (701).

10. The inclined pressure line structure with a closed cavity according to claim 9, characterized in that: A positioning hole (18) is formed in the center of the bottom wall of the pressure groove (3). The positioning hole (18) is configured to accommodate the bottom end of the control rod (901) in the locked state to assist in positioning. The end face of the control lever (901) away from the control frustum (902) has an internal hexagonal hole (19) for external tools to drive rotation; The opening of the operation window (14) is detachably fitted with a sealing baffle (20), which is configured to cover the control lever (901) after installation to maintain a consistent appearance.

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