A canopy opening and closing mechanism

Abstract

This utility model discloses a machine cover opening and closing mechanism that is easy to maintain. It includes a mounting plate connected to a turntable, a main slide groove horizontally formed on the mounting plate, a slider, and a first connecting rod. The slider is slidably connected to the main slide groove. One end of the first connecting rod is hinged to the slider, and the other end is hinged to the machine cover. The machine cover is hinged to the turntable. The main slide groove is parallel to the turntable end face where the mounting plate is located. It also includes a first secondary slide groove perpendicular to the main slide groove in the horizontal direction. The end of the first secondary slide groove away from the turntable is connected to the end of the main slide groove near the machine cover. When the machine cover is open, the slider is at the bottom of the first secondary slide groove near the turntable. When the machine cover is closed, the slider is inside the main slide groove. By combining the main and secondary slide grooves on the mounting plate with the slider's linkage mechanism and a mechanical self-locking device, precise control and state locking of the machine cover opening and closing trajectory are achieved, improving the mechanism's environmental adaptability and operational reliability, and mitigating safety hazards under extreme temperature conditions.

Description

Technical Field

[0001] This utility model relates to a hood opening and closing mechanism that is easy to maintain, and belongs to the technical field of engineering machinery. Background Technology

[0002] The current boom-type aerial work platform's hood opening and closing function is reflected in terms of convenience, safety, and economy.

[0003] Currently, the opening and closing of large machine covers is mainly in the vertical direction, and a gas spring is used as the power source for opening. Its structure is that one end of the gas spring is connected to the turntable hinge point, and the other end is connected to the machine cover hinge point; when the lock is released, the gas spring extends to its natural length and drives the machine cover to a predetermined angle.

[0004] Because high-capacity boom cranes in the industry are highly functional and have numerous electro-hydraulic components, they typically employ large hoods to accommodate the load. The weight and volume of these hoods necessitate a larger and more numerous arrangement of the hinge points for the gas springs used to open them; generally, large hoods require at least eight gas springs. Furthermore, gas springs are significantly affected by temperature. In hot weather, their extension force increases, causing the hood to spring open faster than usual, potentially resulting in injury to personnel without warning. Additionally, in extremely cold regions, the probability of gas spring failure increases dramatically, preventing the hood from opening. All of these factors increase production and after-sales costs. Moreover, gas springs have a minimum compression length, meaning they require a certain amount of space for placement; therefore, this design is unsuitable for hoods with unusual shapes. Summary of the Invention

[0005] Purpose of the invention: To solve the above-mentioned technical problems, this utility model provides a machine cover opening and closing mechanism that is easy to maintain. Through the sliding cooperation of the main slide groove, the first auxiliary slide groove and the slider on the mounting plate, combined with the first connecting rod driving the machine cover to rotate around the hinge point, the precise mechanical control of the machine cover opening and closing trajectory is achieved.

[0006] Technical Solution: A machine cover opening and closing mechanism that is easy to maintain includes a mounting plate connected to a turntable, a main slide groove horizontally opened on the mounting plate, a slider, and a first connecting rod. The slider is slidably connected to the main slide groove. One end of the first connecting rod is hinged to the slider, and the other end is hinged to the machine cover. The machine cover is hinged to the turntable. The main slide groove is parallel to the turntable end face where the mounting plate is located. The mechanism also includes a first secondary slide groove arranged perpendicular to the main slide groove in a horizontal direction. The end of the first secondary slide groove away from the turntable is connected to the end of the main slide groove near the machine cover. When the machine cover is in the open state, the slider is at the bottom of the first secondary slide groove near the turntable end. When the machine cover is in the closed state, the slider is inside the main slide groove.

[0007] This invention achieves precise mechanical control of the opening and closing trajectory of the machine cover by sliding the main slide groove, the first auxiliary slide groove and the slider on the mounting plate, combined with the first connecting rod driving the machine cover to rotate around the hinge point. This solves the problem of uncontrolled opening speed or failure caused by temperature influence in traditional gas spring solutions, while also eliminating the spatial limitations of gas spring layout and reducing production and maintenance costs.

[0008] In a preferred embodiment, to facilitate slider installation and maintenance, the mounting plate has a slider mounting port at the end furthest from the first auxiliary slide groove. This mounting port is connected to the main slide groove, and the slider enters the main slide groove through this port. This design, where the slider mounting port is connected to the main slide groove, allows the slider to be directly inserted into the main slide groove from the end of the mounting plate, simplifying the assembly process.

[0009] In a preferred embodiment, to prevent the slider from dislodging from the groove and to ensure the strength of the mounting plate, a second auxiliary slide groove is also included. One end of the second auxiliary slide groove is connected through the slider mounting opening, and the other end is connected through the main slide groove. By adding a second auxiliary slide groove that connects the slider mounting opening and the main slide groove, the linear movement path of the slider along the main slide groove is enclosed, while avoiding structural weakening at the end of the mounting plate due to slotting.

[0010] In a preferred embodiment, to achieve self-locking and linkage control of the machine cover opening and closing, the mounting plate is provided with a linkage chamber, and further includes a first telescopic mechanism, a transmission mechanism, and a second telescopic mechanism disposed within the linkage chamber. The first telescopic mechanism is linked with the second telescopic mechanism through the transmission mechanism. One end of the first telescopic mechanism penetrates the groove wall of the first auxiliary slide near the machine cover and extends and retracts along its penetrating direction after abutting against the slider, thereby triggering unlocking or locking. One end of the second telescopic mechanism penetrates the groove wall of the main slide away from the turntable and extends and retracts along its penetrating direction in linkage with the first telescopic mechanism. When the first telescopic mechanism is in the retracted and locked state, the second telescopic mechanism is in the extended state.

[0011] Through the mechanical linkage of the first telescopic mechanism, the second telescopic mechanism and the transmission mechanism, the slider position is triggered to lock and unlock, ensuring a smooth and reliable opening and closing process of the cover, and completely replacing the gas spring power source.

[0012] When it is necessary to open the cover, pull the cover outward, which will cause the slider to slide in the main slide groove until it comes into contact with the first telescopic mechanism and pushes the first telescopic mechanism to retract and lock. At the same time, the first telescopic mechanism drives the transmission mechanism to extend the second telescopic mechanism. At this time, push the cover towards the turntable so that the slider enters the first auxiliary slide groove, thus realizing the opening and locking of the cover.

[0013] When closing the cover, first pull the cover outwards to disengage the slider from the first auxiliary slide and enter the main slide. Once in the main slide, since the cover rotates around its hinge point with the turntable, continue pulling the cover outwards to cause the slider to press against the first telescopic mechanism, unlocking and extending it. At the same time, the second telescopic mechanism retracts. Then, push the cover towards the turntable. The unlocked first telescopic mechanism will simultaneously push the slider along the main slide, preventing it from re-entering the first auxiliary slide.

[0014] In a preferred embodiment, for precise control of the locking state switching, the first telescopic mechanism includes a slide rail, a limiting block, a spring, a moving rod, a second connecting rod, and a limiting groove formed on the limiting block. The slide rail is arranged parallel to one side of the turntable, and its two ends are respectively connected to the inner wall of the linkage chamber. The limiting block is slidably connected to the slide rail. The spring is arranged along the moving direction of the limiting block, with one end of the spring connected to the inner wall of the linkage chamber and the other end connected to the end of the limiting block. One end of the second connecting rod passes through the groove wall of the first auxiliary slide groove near the machine cover, and the other end is connected to the limiting block. One end of the moving rod is hinged to the inner wall of the linkage chamber, and the other end moves within the limiting groove.

[0015] When the second link is pressed by the slider, the limiting block is pushed by the second link and slides on the slide rail. At the same time, the spring is pulled, and the moving rod moves in the limiting groove to lock. When the second link is pressed by the slider again, the moving rod moves in the limiting groove to unlock. The spring returns to its original position, pulling the limiting block back to its original position, completing the unlocked state. This realizes that the slider's thrust is converted into the directional displacement of the limiting block, ensuring the accuracy of the locking and unlocking actions.

[0016] In a preferred embodiment, to transmit mechanical motion between the telescopic mechanisms, the second telescopic mechanism includes a third link that penetrates the groove wall on the side of the main slide away from the turntable. The third link is equipped with a second rack that is connected to the transmission mechanism. Through the integrated design of the third link and the second rack, power transmission from the transmission mechanism to the second telescopic mechanism is achieved, ensuring synchronized operation of the two mechanisms.

[0017] In a preferred embodiment, to efficiently switch between motion direction and stroke, the limiting block is provided with a first rack, and the transmission mechanism includes a first gear, a second gear, and a third gear that mesh sequentially. The first gear meshes with the first rack, and the third gear meshes with the second rack. Through the meshing transmission of the first rack-gear set-second rack, a 90° directional switch from the horizontal movement of the first telescopic mechanism to the vertical movement of the second telescopic mechanism is achieved, optimizing the linkage efficiency.

[0018] In a preferred embodiment, to prevent accidental locking and enhance locking reliability, a guide block is provided in the middle of the limiting groove. The side of the guide block and the wall of the limiting groove form a first channel and a second channel connected end to end. The first channel and the second channel are respectively located on opposite sides of the diagonal of the limiting block. An unlocking groove is provided in the limiting groove near the hinge point of the moving rod. The slope of the first channel gradually increases from one side of the unlocking groove to the side of the main slide groove to form a first step. The slope of the second channel gradually increases from one side of the main slide groove to the side of the unlocking groove to form a second step. A locking protrusion is provided on the side wall of the guide block located in the second channel. A locking part is formed between the guide block and the opposite side walls of the locking protrusion.

[0019] The dual-channel sloping steps and locking protrusions constructed by guide blocks force the moving rod to move along a preset path, allowing only unidirectional unlocking operations and preventing the cover from accidentally opening under vibration or external force. The shape of the limiting groove wall corresponds to and matches the first and second channels.

[0020] When the first telescopic mechanism is in the unlocked state, the moving rod is located in the unlocking slot. When it is necessary to enter the locked state, the moving rod moves in the first channel, falls from the first step into the second channel, moves along the second channel and abuts against the locking part to achieve locking.

[0021] When unlocking is required, the moving rod moves along the side wall of the locking part and disengages from the locking part. It continues to move along the second channel, falls from the second step onto the first channel, and returns to the unlocking slot, thus unlocking the device.

[0022] Beneficial effects: This utility model replaces the traditional gas spring solution by combining the main and auxiliary slides on the mounting plate with the slider linkage mechanism and a mechanical self-locking device. This achieves precise control and state locking of the hood opening and closing trajectory, improves the environmental adaptability and operational reliability of the mechanism, and mitigates safety hazards such as high-temperature spring speed runaway / low-temperature failure under extreme temperature conditions. At the same time, the design of the main and auxiliary slides and linkage chamber eliminates the spatial limitations of the gas spring layout, simplifies the assembly and maintenance process, and enhances the locking stability by utilizing the anti-mistriking mechanism of the first and second channels and the slope steps. It can meet the comprehensive requirements of large aerial work platforms for the safety, economy, and adaptability to special spaces when opening and closing the hood. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the entire machine cover of this utility model when opened;

[0025] Figure 2 This is a diagram showing the opening and closing mechanism when the cover of this utility model is in the closed state.

[0026] Figure 3 This is a diagram showing the opening and closing mechanism when the cover of this utility model is in the open state.

[0027] Figure 4 This is a structural diagram of the internal linkage chamber of the mounting plate of this utility model;

[0028] Figure 5 This is a schematic diagram of the limiting block structure of this utility model. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0031] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0032] like Figures 1-5As shown, a maintenance-friendly machine cover opening and closing mechanism includes a mounting plate 2 connected to a turntable 1, a main slide groove 21 horizontally opened on the mounting plate 2, a slider 3, and a first connecting rod 4. The slider 3 is slidably connected to the main slide groove 21. One end of the first connecting rod 4 is hinged to the slider 3, and the other end is hinged to the machine cover 5. The machine cover 5 is hinged to the turntable 1. The main slide groove 21 is parallel to the end face of the turntable 1 where the mounting plate 2 is located. The mechanism also includes a first secondary slide groove 22 arranged perpendicular to the main slide groove 21 in the horizontal direction. The end of the first secondary slide groove 22 away from the turntable 1 is connected to the end of the main slide groove 21 near the machine cover 5. When the machine cover 5 is in the open state, the slider 3 is at the bottom of the first secondary slide groove 22 near the turntable 1. When the machine cover 5 is in the closed state, the slider 3 is inside the main slide groove 21.

[0033] By sliding the main slide groove 21 and the first auxiliary slide groove 22 on the mounting plate 2 with the slider 3, and combined with the first connecting rod 4 driving the cover 5 to rotate around the hinge point, the precise mechanical control of the opening and closing trajectory of the cover 5 is achieved. This solves the problem of uncontrolled or failed opening speed caused by temperature influence in the traditional gas spring 63 scheme, while eliminating the spatial limitations of the gas spring 63 layout and reducing production and maintenance costs.

[0034] To facilitate the installation and maintenance of the slider 3, a slider mounting port 23 is provided at the end of the mounting plate 2 away from the first auxiliary slide groove 22. The slider mounting port 23 is connected to the main slide groove 21, and the slider 3 enters the main slide groove 21 through the slider mounting port 23. The design of the slider mounting port 23 being connected to the main slide groove 21 allows the slider 3 to be directly installed into the main slide groove 21 from the end of the mounting plate 2, simplifying the assembly process.

[0035] To prevent the slider 3 from dislodging from the groove and to ensure the strength of the mounting plate 2, a second auxiliary slide groove 24 is also included. One end of the second auxiliary slide groove 24 is connected through the slider mounting opening 23, and the other end is connected through the main slide groove 21. By adding the second auxiliary slide groove 24 that connects the slider mounting opening 23 and the main slide groove 21, the linear movement path of the slider 3 along the main slide groove 21 is enclosed, while avoiding structural weakening at the end of the mounting plate 2 due to the groove.

[0036] To achieve self-locking and linkage control of the opening and closing of the cover 5, the mounting plate 2 is provided with a linkage chamber 25, and also includes a first telescopic mechanism 6, a transmission mechanism 7, and a second telescopic mechanism 8 disposed in the linkage chamber 25. The first telescopic mechanism 6 is linked with the second telescopic mechanism 8 through the transmission mechanism 7. One end of the first telescopic mechanism 6 penetrates the groove wall of the first auxiliary slide 22 near the cover 5, and after abutting against the slider 3, it extends and retracts along its penetrating direction to trigger unlocking or locking. One end of the second telescopic mechanism 8 penetrates the groove wall of the main slide 21 away from the turntable 1, and is linked with the first telescopic mechanism 6 to extend and retract along its penetrating direction. When the first telescopic mechanism 6 is in the retracted and locked state, the second telescopic mechanism 8 is in the extended state.

[0037] Through the mechanical linkage of the first telescopic mechanism 6, the second telescopic mechanism 8 and the transmission mechanism 7, the position of the slider 3 is triggered to lock and unlock, ensuring that the opening and closing process of the cover 5 is smooth and reliable, and completely replacing the power source of the gas spring 63.

[0038] When it is necessary to open the cover 5, pull the cover 5 outward, so that the slider 3 slides in the main slide groove 21 until it comes into contact with the first telescopic mechanism 6 and pushes the first telescopic mechanism 6 to retract and lock. At the same time, the first telescopic mechanism 6 drives the transmission mechanism 7 to drive the second telescopic mechanism 8 to extend. At this time, push the cover 5 towards the turntable 1 so that the slider 3 enters the first auxiliary slide groove 22, thereby realizing the opening and locking of the cover 5.

[0039] When closing the cover 5, first pull the cover 5 outward so that the slider 3 disengages from the first auxiliary slide 22 and enters the main slide 21. After reaching the main slide 21, since the cover 5 rotates around its hinge point with the turntable 1, continue to pull the cover 5 outward so that the slider 3 squeezes the first telescopic mechanism 6, causing it to unlock and extend. At the same time, the second telescopic mechanism 8 retracts. At this time, push the cover 5 towards the turntable 1. The unlocked first telescopic mechanism 6 will simultaneously push the slider 3 to move along the main slide 21, preventing it from re-entering the first auxiliary slide 22.

[0040] To precisely control the switching of the locked state, the first telescopic mechanism 6 includes a slide rail 61, a limiting block 62, a spring 63, a moving rod 64, a second connecting rod 65, and a limiting groove 621 formed on the limiting block 62. The slide rail 61 is set parallel to one side of the turntable 1, and its two ends are respectively connected to the inner wall of the linkage chamber 25. The limiting block 62 is slidably connected to the slide rail 61. The spring 63 is set along the moving direction of the limiting block 62. One end of the spring 63 is connected to the inner wall of the linkage chamber 25, and the other end is connected to the end of the limiting block 62. One end of the second connecting rod 65 passes through the groove wall of the first auxiliary slide groove 22 near the machine cover 5, and the other end is connected to the limiting block 62. One end of the moving rod 64 is hinged to the inner wall of the linkage chamber 25, and the other end moves within the limiting groove 621.

[0041] When the second link 65 is pressed by the slider 3, the limiting block 62 is pushed by the second link 65 and slides on the slide rail 61. At the same time, the spring 63 is pulled, and the moving rod 64 moves in the limiting groove 621 to achieve locking. When the second link 65 is pressed by the slider 3 again, the moving rod 64 moves in the limiting groove 621 to achieve unlocking. The spring 63 returns to its original position and pulls the limiting block 62 to return to its original position, completing the unlocked state. This realizes that the pushing force of the slider 3 is converted into the directional displacement of the limiting block 62, ensuring the accuracy of the locking and unlocking action response.

[0042] To transmit mechanical motion between the telescopic mechanisms, the second telescopic mechanism 8 includes a third link 81. The third link 81 passes through the groove wall of the main slide 21 on the side away from the turntable 1. The third link 81 is equipped with a second rack 82 that is connected to the transmission mechanism 7. Through the integrated design of the third link 81 and the second rack 82, the power transmission from the transmission mechanism 7 to the second telescopic mechanism 8 is realized, ensuring that the two mechanisms move synchronously.

[0043] To efficiently switch the direction and stroke of motion, the limiting block 62 is equipped with a first rack 622. The transmission mechanism 7 includes a first gear 71, a second gear 72, and a third gear 73 that mesh sequentially. The first gear 71 meshes with the first rack 622, and the third gear 73 meshes with the second rack 82. Through the meshing transmission of the first rack 622-gear set-second rack 82, a 90° directional switch is achieved from the horizontal movement of the first telescopic mechanism 6 to the vertical movement of the second telescopic mechanism 8, optimizing the linkage efficiency.

[0044] To prevent accidental locking and enhance locking reliability, a guide block 6211 is provided in the middle of the limiting groove 621. The side of the guide block 6211 and the wall of the limiting groove 621 form a first channel 9 and a second channel 10 connected end to end. The first channel 9 and the second channel 10 are respectively located on both sides of the diagonal of the limiting block 62. An unlocking groove 6212 is provided in the limiting groove 621 near the hinge point of the moving rod 64. The slope of the first channel 9 gradually increases from one side of the unlocking groove 6212 to the side of the main slide 21 to form a first step 91. The slope of the second channel 10 gradually increases from one side of the main slide 21 to the side of the unlocking groove 6212 to form a second step 101. A locking protrusion 62111 is provided on the side wall of the guide block 6211 located in the second channel 10. A locking part 6213 is formed between the guide block 6211 and the locking protrusion 62111 on opposite side walls.

[0045] The dual-channel sloping steps constructed by the guide block 6211 and the locking protrusion 62111 force the moving rod 64 to move along a preset path, allowing only unidirectional unlocking operations and preventing the cover 5 from being accidentally opened under vibration or external force. The shape of the wall of the limiting groove 621 corresponds to and matches the shape of the first channel 9 and the second channel 10.

[0046] When the first telescopic mechanism 6 is in the unlocked state, the moving rod 64 is located in the unlocking groove 6212. When it is necessary to enter the locked state, the moving rod 64 moves in the first channel 9, falls from the first step 91 to the second channel 10, moves along the second channel 10 and abuts against the locking part 6213 to achieve locking.

[0047] When unlocking is required, the moving rod 64 moves along the side wall of the locking part 6213 and then disengages from the locking part 6213. It continues to move along the second channel 10, falls from the second step 101 onto the first channel 9, and returns to the unlocking slot 6212 to achieve unlocking.

[0048] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0049] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A hood opening and closing mechanism that facilitates maintenance, characterized by: The system includes a mounting plate (2) connected to a turntable (1), a main slide groove (21) horizontally opened on the mounting plate (2), a slider (3), and a first connecting rod (4). The slider (3) is slidably connected to the main slide groove (21). One end of the first connecting rod (4) is hinged to the slider (3), and the other end is hinged to the machine cover (5). The machine cover (5) is hinged to the turntable (1). The main slide groove (21) is parallel to the end face of the turntable (1) where the mounting plate (2) is located. The system also includes a first auxiliary slide groove (22) set vertically to the main slide groove (21) in the horizontal direction. The end of the first auxiliary slide groove (22) away from the turntable (1) is connected to the end of the main slide groove (21) near the machine cover (5). When the machine cover (5) is in the open state, the slider (3) is at the bottom of the first auxiliary slide groove (22) near the turntable (1). When the machine cover (5) is in the closed state, the slider (3) is in the main slide groove (21).

2. The maintenance-friendly hood opening and closing mechanism according to claim 1, characterized in that: The mounting plate (2) has a slider mounting port (23) at one end away from the first auxiliary slide groove (22). The slider mounting port (23) is connected to the main slide groove (21). The slider (3) enters the main slide groove (21) through the slider mounting port (23).

3. The maintenance-friendly hood opening and closing mechanism according to claim 2, characterized in that: It also includes a second auxiliary slide (24), one end of which is connected to the slider mounting port (23) and the other end is connected to the main slide (21).

4. The maintenance-friendly hood opening and closing mechanism according to claim 1, characterized in that: The mounting plate (2) is provided with a linkage chamber (25), and also includes a first telescopic mechanism (6), a transmission mechanism (7), and a second telescopic mechanism (8) disposed in the linkage chamber (25). The first telescopic mechanism (6) is linked with the second telescopic mechanism (8) through the transmission mechanism (7). One end of the first telescopic mechanism (6) passes through the groove wall of the first auxiliary slide (22) near the machine cover (5), and after abutting against the slider (3), it extends and retracts along its penetrating direction to trigger unlocking or locking. One end of the second telescopic mechanism (8) passes through the groove wall of the main slide (21) away from the turntable (1), and is linked with the first telescopic mechanism (6) to extend and retract along its penetrating direction. When the first telescopic mechanism (6) is in the retracted and locked state, the second telescopic mechanism (8) is in the extended state.

5. The maintenance-friendly hood opening and closing mechanism according to claim 4, characterized in that: The first telescopic mechanism (6) includes a slide rail (61), a limiting block (62), a spring (63), a moving rod (64), a second connecting rod (65), and a limiting groove (621) opened on the limiting block (62). The slide rail (61) is set parallel to one side of the turntable (1), and its two ends are respectively connected to the inner wall of the linkage chamber (25). The limiting block (62) is slidably connected to the slide rail (61). The spring (63) is set along the moving direction of the limiting block (62). One end of the spring (63) is connected to the inner wall of the linkage chamber (25), and the other end is connected to the end of the limiting block (62). One end of the second connecting rod (65) passes through the groove wall of the first auxiliary slide groove (22) near the machine cover (5), and the other end is connected to the limiting block (62). One end of the moving rod (64) is hinged to the inner wall of the linkage chamber (25), and the other end moves in the limiting groove (621).

6. The maintenance-friendly hood opening and closing mechanism according to claim 5, characterized in that: The second telescopic mechanism (8) includes a third link (81), which passes through the groove wall of the main slide (21) away from the turntable (1). The third link (81) is provided with a second rack (82) that is connected to the transmission mechanism (7).

7. The maintenance-friendly hood opening and closing mechanism according to claim 6, characterized in that: The limiting block (62) is provided with a first rack (622), and the transmission mechanism (7) includes a first gear (71), a second gear (72), and a third gear (73) that mesh in sequence. The first gear (71) meshes with the first rack (622) for transmission, and the third gear (73) meshes with the second rack (82) for transmission.

8. The maintenance-friendly hood opening and closing mechanism according to claim 5, characterized in that: The limiting groove (621) is provided with a guide block (6211) in the middle. The side of the guide block (6211) and the wall of the limiting groove (621) form a first channel (9) and a second channel (10) connected end to end. The first channel (9) and the second channel (10) are respectively located on both sides of the diagonal of the limiting block (62). The limiting groove (621) is provided with an unlocking groove (6212) near the hinge point of the moving rod (64). The slope of the first channel (9) is along the unlocking groove (6212). The slope of the second channel (10) gradually increases from one side of the main slide (21) to the other side to form a first step (91). The slope of the second channel (10) gradually increases from one side of the main slide (21) to the other side to form a second step (101). The guide block (6211) located in the second channel (10) has a locking protrusion (62111) on its side wall. The guide block (6211) and the locking protrusion (62111) form a locking part (6213) between their respective side walls.

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