Cable trench cover plate opening and closing device

Abstract

The invention provides a cable trench cover plate opening and closing device which comprises a moving frame, a lifting frame and a hoisting frame, a walking mechanism is arranged at the bottom of the moving frame, the lifting frame is provided with a transverse hoisting arm, the lifting frame is in sliding fit with the moving frame and has the degree of freedom of vertical movement, and the hoisting arm is suitable for transversely extending to the upper side of a cable trench; the lifting frame is rotationally matched with the lifting arm, is suitable for lifting the cover plate and has three states including a right inclined state, a vertical state and a left inclined state, when the lifting frame is in the right inclined state and the left inclined state, a preset included angle is formed between the lifting frame and the lifting arm, when the lifting frame is in the right inclined state, the lifting frame is suitable for being aligned with the cover plate to be opened, and when the lifting frame is in the vertical state, the lifting frame is suitable for being aligned with the cover plate to be opened. The lifting frame is suitable for being aligned with the to-be-placed position of the cover plate when in the left inclined state and is suitable for being aligned with the to-be-closed cover plate when in the left inclined state; the lifting arm is further provided with a state maintaining assembly, and the state maintaining assembly enables the lifting frame to be maintained in a right inclined state or a left inclined state.

Description

Technical Field

[0001] The invention belongs to the technical field of electric appliances, and in particular relates to an opening and closing device for a cable trench cover. Background Art

[0002] Cable trench covers refer to special plates used to cover cable trenches, which are usually used in industries such as electricity and communications. Cable trench covers are widely used in underground cable trenches in urban power, communications and other industries. They not only protect the safe operation of underground cables, but also maintain the safety and cleanliness of the surrounding environment.

[0003] Its main functions are: To protect the cables, the cover can effectively prevent heavy objects or other external objects from pressing on them, thereby protecting the cables from damage. At the same time, the cover can also prevent small animals from entering the cable trench, reducing the possibility of cable damage; Ensure safety. Open cable trenches can easily cause pedestrians or vehicles to fall accidentally. Covers can effectively reduce these risks and improve public safety. Easy maintenance: Although the cover provides protection, when maintenance is required, the cover is generally designed to allow it to be opened easily and quickly, making it easier to inspect and maintain the cables.

[0004] When inspecting cables, heavy cable trench covers need to be opened. The traditional manual prying operation is the main way to open cable trench covers. It requires a lot of manpower, and the tightly squeezed cable trench covers are difficult to open. Because the cable trench covers are heavy and there are many of them, when multiple people work together, there is a high risk of crushing fingers and the crowbar rebounding and injuring people. Therefore, the traditional manual prying operation has a great safety hazard. Summary of the invention

[0005] The present invention provides a cable trench cover opening and closing device, aiming to solve the technical problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: to provide a cable trench cover opening and closing device, including a moving frame, a lifting frame, and a hoisting frame. A walking mechanism is provided at the bottom of the moving frame, and the lifting frame is provided with a horizontal lifting arm. The lifting frame and the moving frame are slidably matched and have the freedom to move up and down. A first driving component is provided on the moving frame to drive the lifting frame to move up and down; the lifting arm is suitable for extending laterally to the upper side of the cable trench; the lifting frame and the lifting arm are rotatably matched and suitable for lifting the cover. The frame has three states: a right tilted state, a vertical state and a left tilted state. When the lifting frame is in the right tilted state and the left tilted state, the lifting frame and the lifting arm form a preset angle, and when the lifting frame is in the right tilted state, it is suitable for aligning with the cover to be opened, when the lifting frame is in the vertical state, it is suitable for aligning with the position where the cover is to be placed, and when the lifting frame is in the left tilted state, it is suitable for aligning with the cover to be closed; a state maintaining component is also provided on the lifting arm, and the state maintaining component enables the lifting frame to maintain the right tilted state or the left tilted state.

[0007] In a possible implementation of the cable trench cover opening and closing device provided by the present invention, the lifting frame includes a frame body and a grabbing and releasing assembly, the frame body is rotatably coordinated with the lifting arm, and the grabbing and releasing assembly is arranged at the bottom of the frame body and connected to the frame body for grabbing the cover plate.

[0008] In a possible implementation of the cable trench cover opening and closing device provided by the present invention, the frame includes two guide tubes, a connecting rod, a flexible connector and an adjustment assembly. The two guide tubes are arranged in an eight-shape, and the upper ends are connected to the connecting rod. The flexible connector is passed through the two guide tubes, and both ends protrude from the lower ends of the guide tubes and are connected to the grasping and releasing assembly. The adjusting assembly is connected to the flexible connector and is used to adjust the length of the flexible connector extending out of the two guide tubes, so that when the lifting frame is in the right inclined state, the left inclined state and the vertical state, the cover grasped by the grasping and releasing assembly is in a horizontal state.

[0009] In a possible implementation of the cable trench cover opening and closing device provided by the present invention, the flexible connecting member is a chain, the adjusting assembly includes a gear and a second driving assembly, the chain is mounted on the gear, the gear is rotatably matched with the connecting rod, and the second driving assembly is used to drive the gear to rotate.

[0010] In a possible implementation of the cable trench cover opening and closing device provided by the present invention, the middle part of the connecting rod is rotatably connected to the lifting arm, and the second driving assembly includes two hydraulic cylinders and a hydraulic motor. The two hydraulic cylinders are respectively arranged at both ends of the connecting rod, and the piston rod of the hydraulic cylinder is rotatably connected to the lifting arm, and the cylinder body of the hydraulic cylinder is rotatably connected to the connecting rod or the guide tube, the rod chamber of the hydraulic cylinder is connected to the outside, and the rodless chamber is filled with medium and connected to the hydraulic motor, and the rodless chambers of the two hydraulic cylinders are respectively connected to the two oil ports of the hydraulic motor through pipelines, and the hydraulic motor is connected to the connecting rod, and the power output end rotates with the gear to drive the gear to rotate, and then the chain is driven to move through the gear, so that when the lifting frame is in the right inclined state, the left inclined state and the vertical state, the two ends of the chain are in the same horizontal plane, so that the cover plate remains horizontal.

[0011] It should be noted that the hydraulic cylinder and the hydraulic motor can be replaced by a pneumatic cylinder and a pneumatic motor.

[0012] In a possible implementation of the cable trench cover opening and closing device provided by the present invention, the grabbing and releasing assembly includes two suction cups, which are respectively connected to the two ends of the flexible connector, and the two suction cups are connected to each other and to the negative pressure source through a negative pressure pipeline.

[0013] Specifically, the negative pressure source is a vacuum generator or a site negative pressure source.

[0014] In a possible implementation of the cable trench cover opening and closing device provided by the present invention, the grasping and releasing assembly also includes a releasing mechanism, the releasing mechanism includes a valve, the valve is provided with two valve ports, the two valve ports are respectively connected to the negative pressure pipeline and the outside atmosphere, a trigger block is provided on one side of the valve, and when the trigger block is pressed, the two valve ports are connected, and the suction cup is connected to the outside atmosphere.

[0015] In a possible implementation of the cable trench cover opening and closing device provided by the present invention, a guide groove is provided on the inner wall of the guide tube, and the flexible connector is embedded in the guide groove on both sides and slidably cooperates with the guide tube, and the valve is connected to the flexible connector and is suitable for sliding into or out of the guide tube on the left side with the flexible connector; the release mechanism also includes a slider, a pull block and a spring, the trigger block is arranged on the side of the valve facing away from the flexible connector, the upper end of the trigger block is provided with a first chamfer, and the lower end is provided with a second chamfer, the projection length of the first chamfer in the direction of valve movement is a, and the projection length of the second chamfer in the direction of valve movement is a. The length is b; a receiving groove is provided on the inner wall of the wire tube on the side of the valve facing away from the flexible connector, one end of the slider is arranged in the receiving groove and slidably cooperates with the guide tube, and the spring clip is arranged between the slider and the bottom of the receiving groove; one end of the pull block is connected to the slider, and the other end extends out of the guide tube to the side of the slider facing away from the valve, and the slider is suitable for retracting a preset distance into the receiving groove; the overlapping length of the projection of the slider and the trigger block in the movement direction of the valve is c, and in the normal state, a>c>b, and after the pull block is pulled to retract the slider to the receiving groove by a preset distance, a>b>c.

[0016] In a possible implementation of the cable trench cover opening and closing device provided by the present invention, a sliding frame and a third driving assembly are provided on the lifting arm, the sliding frame is slidably matched with the lifting arm, the third driving assembly is connected to the lifting arm, and the power output end is connected to the sliding frame to drive the sliding frame eye and the lifting arm to slide, and the lifting frame is rotatably connected to the sliding frame.

[0017] In a possible implementation of the cable trench cover opening and closing device provided by the present invention, the state maintaining component includes a right magnet and a left magnet, and the right magnet and the left magnet are both connected to the sliding frame. When the lifting frame is in a right tilted state, the right magnet adsorbs the lifting frame, and when the lifting frame is in a left tilted state, the left magnet adsorbs the lifting frame.

[0018] The beneficial effects of the cable trench cover opening and closing device provided by the present invention are as follows: compared with the prior art, the cable trench cover opening and closing device provided by the present invention, before opening the cover, maintains the lifting frame in a right-inclined state through a state maintaining component, and aligns the lifting frame in the right-inclined state with the cover on the cable trench, lifts the cover, and then uses the cover's own weight to make the lifting frame swing to a vertical state with the cover, at which time the cover is located on one side of the cable trench, and then lowers the cover to complete the opening of the cover; before closing the cover, maintains the lifting frame in a left-inclined state through a state maintaining component and aligns the lifting frame with the cover on one side of the cable trench, lifts the cover, and then uses the cover to automatically swing to a vertical state with the lifting frame, at which time the cover is located on the upper side of the cable trench, and lowers the cover to complete the closing of the cover, that is, the entire opening and closing process of the cable trench cover no longer requires manual handling, and can effectively avoid safety hazards such as crushing fingers and crowbar rebound injuries. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the three-dimensional structure of a cable trench cover opening and closing device provided in an embodiment of the present invention; Figure 2 A schematic diagram of the main structure of a cable trench cover opening and closing device provided in an embodiment of the present invention; Figure 3 for Figure 1 A magnified view of part A in FIG. Figure 4 For along Figure 2 Partial cross-sectional structure diagram along the BB line; Figure 5 for Figure 4 The enlarged view of the C part in FIG. Description of reference numerals: 10. Mobile frame; 11. First driving assembly; 20. Lifting frame; 21. Lifting arm; 22. Sliding frame; 23. The third driving assembly; 31. The guide tube; 32. The connecting rod; 33. The chain; 34. The hydraulic cylinder; 35. Hydraulic motor; 36. Gear; 37. Suction cup; 40. Valve; 41. Trigger block; 411, first chamfer; 412, second chamfer; 51, slider; 52, pull block; 53, spring; 61. Right magnet; 62. Left magnet. DETAILED DESCRIPTION

[0020] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0021] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0022] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0023] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the application. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0024] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0025] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways, and the spatially relative descriptions used here are interpreted accordingly.

[0026] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0027] Please also read Figures 1 to 5 Now, the cable trench cover opening and closing device provided by the present invention is described. The cable trench cover opening and closing device comprises a moving frame 10, a lifting frame 20 and a hoisting frame. The moving frame 10 is provided with a walking mechanism at the bottom, and the lifting frame 20 is provided with a horizontal lifting arm 21. The lifting frame 20 and the moving frame 10 are slidably matched and have the freedom to move up and down. The moving frame 10 is provided with a first driving component 11 for driving the lifting frame 20 to move up and down; the lifting arm 21 is suitable for extending laterally to the upper side of the cable trench; the lifting frame and the lifting arm 21 are rotationally matched and suitable for lifting the cover. The lifting frame has three states: a right tilted state, a vertical state and a left tilted state. When the lifting frame is in the right tilted state and the left tilted state, the lifting frame and the lifting arm 21 are at a preset angle, and when the lifting frame is in the right tilted state, it is suitable for aligning with the cover to be opened, when the lifting frame is in the vertical state, it is suitable for aligning with the position to be placed of the cover, and when the lifting frame is in the left tilted state, it is suitable for aligning with the cover to be closed; a state maintaining component is also provided on the lifting arm 21, and the state maintaining component maintains the lifting frame in the right tilted state or the left tilted state.

[0028] Specifically, the walking mechanism is a roller driven by a motor. The lifting frame 20 is slidably matched with the moving frame 10, and the first driving component 11 is a cylinder or a hydraulic cylinder, which drives the lifting frame 20 to move up and down.

[0029] It should be noted that the right tilted state and the left tilted state are defined relative to the state of the opening and closing device as shown in the accompanying drawings, only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present application.

[0030] The beneficial effects of the cable trench cover opening and closing device provided by the present invention are as follows: compared with the prior art, the cable trench cover opening and closing device provided by the present invention, before opening the cover, maintains the lifting frame in a right-inclined state through a state maintaining component, and aligns the lifting frame in the right-inclined state with the cover on the cable trench, lifts the cover, and then uses the cover's own weight to make the lifting frame swing to a vertical state with the cover, at which time the cover is located on one side of the cable trench, and then lowers the cover to complete the opening of the cover; before closing the cover, maintains the lifting frame in a left-inclined state through a state maintaining component and aligns the lifting frame with the cover on one side of the cable trench, lifts the cover, and then uses the cover to automatically swing to a vertical state with the lifting frame, at which time the cover is located on the upper side of the cable trench, and lowers the cover to complete the closing of the cover, that is, the entire opening and closing process of the cable trench cover no longer requires manual handling, and can effectively avoid safety hazards such as crushing fingers and crowbar rebound injuries.

[0031] It needs to be further explained that there are some equipment for opening and closing cover plates on the market, but most of them are opened and closed by lifting. During operation, the cover plate is first lifted by the lifting mechanism, then translated to the specified position by the translation mechanism, and finally the lifting mechanism is controlled to lower the cover plate to complete the opening or closing of the cover plate; that is, at least three actions of lifting-translation-lowering are required to complete the opening or closing of the cover plate, which is relatively cumbersome, and the power of the equipment needs to be used to drive the translation of the cover plate when the cover plate is lifted, which consumes a lot of energy.

[0032] The cover opening and closing device provided in the embodiment of the present application only needs to lift the cover when opening and closing the cover, and the cover can be swung to the required position by relying on its own weight, which greatly reduces the number of actions. Among them, keeping the lifting frame in a right tilt state or a left tilt state is a preparatory work before the operation, and during the operation, only one action of lifting the cover is required; and after lifting the cover, the cover is swung to the specified position by relying on its own weight, without consuming additional equipment power, and the energy consumption is lower.

[0033] like Figure 1 and Figure 2 As shown, in a specific implementation of the cable trench cover opening and closing device provided in an embodiment of the present invention, the lifting frame includes a frame body and a grabbing and releasing assembly, the frame body rotates in cooperation with the lifting arm 21, the grabbing and releasing assembly is arranged at the bottom of the frame body, connected to the frame body, and is used to grab the cover plate.

[0034] Specifically, Figure 1and Figure 2 As shown, in a specific implementation manner of the cable trench cover opening and closing device provided in an embodiment of the present invention, the frame includes two guide tubes 31, a connecting rod 32, a flexible connector and an adjustment assembly. The two guide tubes 31 are arranged in an eight-shape, and the upper ends are connected to the connecting rod 32. The flexible connector is passed through the two guide tubes 31, and both ends protrude from the lower ends of the guide tubes 31 and are connected to the grasping and releasing assembly. The adjusting assembly is connected to the flexible connector to adjust the length of the flexible connector extending out of the two guide tubes 31, so that when the lifting frame is in the right inclined state, the left inclined state and the vertical state, the cover grasped by the grasping and releasing assembly is in a horizontal state.

[0035] More specifically, Figure 1 and Figure 2 As shown, in a specific implementation of the cable trench cover opening and closing device provided in an embodiment of the present invention, the flexible connecting member is a chain 33, the adjusting assembly includes a gear 36 and a second driving assembly, the chain 33 is mounted on the gear 36, the gear 36 is rotatably matched with the connecting rod 32, and the second driving assembly is used to drive the gear 36 to rotate.

[0036] like Figure 1 and Figure 2 As shown, in a specific implementation manner of the cable trench cover opening and closing device provided by an embodiment of the present invention, the middle part of the connecting rod 32 is rotatably connected to the lifting arm 21, and the second driving assembly includes two hydraulic cylinders 34 and a hydraulic motor 35. The two hydraulic cylinders 34 are respectively arranged at both ends of the connecting rod 32, and the piston rod of the hydraulic cylinder 34 is rotatably connected to the lifting arm 21, and the cylinder body of the hydraulic cylinder 34 is rotatably connected to the connecting rod 32 or the guide tube 31. The rod chamber of the hydraulic cylinder 34 is connected to the outside, and the rodless chamber is filled with medium and connected to the hydraulic motor 35. The rodless chambers of the two hydraulic cylinders 34 are respectively connected to the two oil ports of the hydraulic motor 35 through pipelines, and the hydraulic motor 35 is connected to the connecting rod 32. The power output end rotates with the gear 36 to drive the gear 36 to rotate, and then the gear 36 drives the chain 33 to move, so that when the lifting frame is in the right inclined state, the left inclined state and the vertical state, the two ends of the chain 33 are in the same horizontal plane, so that the cover plate remains horizontal.

[0037] It should be noted that the hydraulic cylinder 34 and the hydraulic motor 35 can be replaced by an air cylinder and a pneumatic motor.

[0038] The rotation of the lifting frame drives the piston in the hydraulic cylinder 34 to move, so that the medium flows between the two hydraulic cylinders 34 and flows through the hydraulic motor 35, driving the hydraulic motor 35 to rotate. The damping of the medium flow increases the resistance of the lifting frame during rotation and plays a buffering role, slowing down the rotation speed of the lifting frame and reducing the swing amplitude of the lifting frame and the cover plate during operation, so that the lifting frame can quickly stop swinging and be in a vertical state.

[0039] like Figure 1 and Figure 2 As shown, in a specific implementation of the cable trench cover opening and closing device provided in an embodiment of the present invention, the grabbing and releasing assembly includes two suction cups 37, and the two suction cups 37 are respectively connected to the two ends of the flexible connector, and the two suction cups 37 are connected to each other and to the negative pressure source through a negative pressure pipeline.

[0040] Specifically, the negative pressure source is a vacuum generator or a site negative pressure source.

[0041] like Figure 1 and Figure 3 As shown, in a specific implementation manner of the cable trench cover opening and closing device provided in an embodiment of the present invention, the grasping and releasing assembly also includes a releasing mechanism, the releasing mechanism includes a valve 40, the valve 40 is provided with two valve ports, the two valve ports are respectively connected to the negative pressure pipeline and the outside atmosphere, a trigger block 41 is provided on one side of the valve 40, and when the trigger block 41 is pressed, the two valve ports are connected, and the suction cup 37 is connected to the outside atmosphere.

[0042] like Figures 3 to 5 As shown, in a specific implementation manner of the cable trench cover opening and closing device provided in an embodiment of the present invention, a guide groove is provided on the inner wall of the guide tube 31, and the flexible connectors are embedded in the guide grooves on both sides and slidably cooperate with the guide tube 31. The valve 40 is connected to the flexible connector and is suitable for sliding into or out of the guide tube 31 on the left side with the flexible connector; the release mechanism also includes a slider 51, a pull block 52 and a spring 53, the trigger block 41 is provided on the side of the valve 40 facing away from the flexible connector, the trigger block 41 is provided with a first chamfer 411 at the upper end, and a second chamfer 412 at the lower end, the projection length of the first chamfer 411 in the movement direction of the valve 40 is a, and the projection length of the second chamfer 412 in the movement direction of the valve 40 is a. The projection length of the valve 40 in the movement direction is b; a receiving groove is provided on the inner wall of the wire tube on the side of the valve 40 facing away from the flexible connector, one end of the slider 51 is arranged in the receiving groove, and slides with the guide tube 31, and the spring 53 is clamped between the slider 51 and the bottom of the receiving groove; one end of the pull block 52 is connected to the slider 51, and the other end extends out of the guide tube 31 to the side of the slider 51 facing away from the valve 40, and the slider 51 is suitable for retracting a preset distance into the receiving groove; the overlapping length of the slider 51 and the trigger block 41 projected in the movement direction of the valve 40 is c, and in the normal state, a>c>b, and after the pull block 52 is pulled to retract the slider 51 to the receiving groove by a preset distance, a>b>c.

[0043] like Figure 1 and Figure 2As shown, in a specific implementation of the cable trench cover opening and closing device provided in an embodiment of the present invention, a sliding frame 22 and a third driving assembly 23 are provided on the lifting arm 21, the sliding frame 22 is slidably matched with the lifting arm 21, the third driving assembly 23 is connected to the lifting arm 21, and the power output end is connected to the sliding frame 22 to drive the sliding frame 22 and the lifting arm 21 to slide, and the lifting frame is rotatably connected to the sliding frame 22.

[0044] Specifically, the third driving assembly 23 is a screw driven by a motor assembly, and the sliding frame 22 is threadedly matched with the screw. The motor assembly drives the screw to rotate, thereby driving the sliding frame 22 to move laterally.

[0045] like Figure 1 and Figure 2 As shown, in a specific implementation of the cable trench cover opening and closing device provided in an embodiment of the present invention, the state maintaining component includes a right magnet 61 and a left magnet 62, and the right magnet 61 and the left magnet 62 are both connected to the sliding frame 22. When the lifting frame is in a right tilted state, the right magnet 61 adsorbs the lifting frame, and when the lifting frame is in a left tilted state, the left magnet 62 adsorbs the lifting frame.

[0046] It should be noted that the right magnet 61 and the left magnet 62 are both lifting magnets or electromagnets, and their magnetism can be controlled manually or electrically.

[0047] The specific working process of the opening and closing device is: Move the opening and closing device to one side of the cable trench cover and align it with the cover in the length direction of the cover.

[0048] When the cover is opened: the third driving assembly 23 drives the sliding frame 22 to move away from the cable trench, so that the vertical lifting frame is aligned with the position where the cover is to be placed on one side of the cable trench.

[0049] The lifting frame is manually pushed or pulled so that the lifting frame is adsorbed on the right magnet 61. At this time, the lifting frame is in a right tilted state and is aligned with the cover to be opened on the cable trench.

[0050] Place the suction cup 37 at the bottom of the lifting frame against the cover plate, connect the negative pressure source, so that the suction cup 37 is adsorbed on the cover plate, and then drive the lifting frame to rise through the lifting frame 20 to lift the cover plate to a specified height, and then control the magnetism of the right magnet 61 to weaken or disappear, so that the lifting frame is separated from the right magnet 61, and automatically swings down to a vertical state under the action of its own gravity.

[0051] During this process, the chain 33 in the left guide tube 31 slides upward, driving the valve 40 to slide upward synchronously until the lifting frame is close to a vertical state, and the upper side of the trigger block 41 on the valve 40 contacts the slider 51 on the guide tube 31. Due to a>c, the slider 51 contacts the inclined surface of the first chamfer 411 of the trigger block 41, and the trigger block 41 is pushed into the valve 40 by the slider 51. The two valve ports of the valve 40 are connected, and the suction cup 37 is connected to the outside atmosphere, automatically loosening the cover plate, allowing the cover plate to fall to the cover plate to be placed on one side of the cable trench, completing the opening of the cover plate.

[0052] When closing the cover: the third driving assembly 23 drives the sliding frame 22 to move toward the side close to the cable trench, so that the vertical lifting frame is aligned with the position where the cover is to be placed on the cable trench.

[0053] The lifting frame is manually pushed or pulled so that the lifting frame is adsorbed on the right magnet 61. At this time, the lifting frame is in a left tilted state and is aligned with the cover plate to be closed on one side of the cable trench.

[0054] Place the suction cup 37 at the bottom of the lifting frame against the cover plate, connect the negative pressure source, so that the suction cup 37 is adsorbed on the cover plate, and then drive the lifting frame to rise through the lifting frame 20 to lift the cover plate to a specified height, and then control the magnetism of the left magnet 62 to weaken or disappear, so that the lifting frame is separated from the left magnet 62, and automatically swings down to a vertical state under the action of its own gravity.

[0055] During this process, the chain 33 in the left guide tube 31 slides downward, driving the valve 40 to slide downward synchronously until the lifting frame approaches or reaches a vertical state, and the lower side of the trigger block 41 on the valve 40 contacts the slider 51 on the guide tube 31. Due to c>b, the slider 51 contacts the plane on the lower side of the trigger block 41 but not the inclined surface of the second chamfer 412. The trigger block 41 cannot be pushed into the valve 40, that is, the cover plate will not be automatically lowered. After manually confirming that the position of the cover plate is correct, pull the pull block 52. At this time, b>c, the slider contacts the inclined surface of the second chamfer 412 of the trigger block 41, and the trigger block 41 is pushed into the valve 40 by the slider 51. The two valve ports of the valve 40 are connected, and the suction cup 37 is connected to the outside atmosphere. The cover plate is released, so that the cover plate falls to the cover plate to be placed on the cable trench, and the cover plate is closed.

[0056] It should be noted that due to the high accuracy requirements for the position of the cover on the cable trench, the above-mentioned arrangement ensures that when the cover is closed, the suction cup 37 will not automatically lower the cover. Instead, after manually confirming that the position of the cover on the lifting frame is correct, the pull block 52 is pulled to manually release the cover. This can effectively avoid the cover being misplaced when it is placed.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A cable trench cover opening and closing device, characterized in that: The yoke is provided with a first drive assembly for driving the yoke to move up and down; the yoke is adapted to extend laterally to the upper side of the cable trench; the yoke is adapted to rotate with the yoke to lift the cover plate; the yoke has three states: a right inclined state, a vertical state and a left inclined state; when the yoke is in the right inclined state and the left inclined state, the yoke and the yoke form a preset angle; and when the yoke is in the right inclined state, the yoke is adapted to align with the cover plate to be opened; when the yoke is in the vertical state, the yoke is adapted to align with the position where the cover plate is to be placed; and when the yoke is in the left inclined state, the yoke is adapted to align with the cover plate to be closed; a state maintaining assembly is also provided on the yoke, and the state maintaining assembly maintains the yoke in the right inclined state or the left inclined state.

2. The cable trench cover opening and closing device according to claim 1, characterized in that: The lifting frame includes a frame body and a grabbing and releasing assembly. The frame body is rotatably matched with the lifting arm. The grabbing and releasing assembly is arranged at the bottom of the frame body and connected to the frame body for grabbing the cover plate.

3. The cable trench cover opening and closing device according to claim 2, characterized in that: The frame body includes two guide tubes, a connecting rod, a flexible connector and an adjustment assembly. The two guide tubes are arranged in an eight-shape, and the upper ends are connected to the connecting rod. The flexible connector is inserted into the two guide tubes, and both ends protrude from the lower ends of the guide tubes and are connected to the grasping and releasing assembly. The adjustment assembly is connected to the flexible connector and is used to adjust the length of the flexible connector extending out of the two guide tubes, so that when the lifting frame is in the right inclined state, the left inclined state and the vertical state, the cover plate grasped by the grasping and releasing assembly is in a horizontal state.

4. The cable trench cover opening and closing device according to claim 3, characterized in that: The flexible connecting member is a chain, the adjusting assembly includes a gear and a second driving assembly, the chain is laid on the gear, the gear is rotationally matched with the connecting rod, and the second driving assembly is used to drive the gear to rotate.

5. The cable trench cover opening and closing device according to claim 4, characterized in that: The middle part of the connecting rod is rotatably connected to the lifting arm. The second driving assembly includes two hydraulic cylinders and a hydraulic motor. The two hydraulic cylinders are respectively arranged at both ends of the connecting rod. The piston rod of the hydraulic cylinder is rotatably connected to the lifting arm. The cylinder body of the hydraulic cylinder is rotatably connected to the connecting rod or the guide tube. The rod chamber of the hydraulic cylinder is connected to the outside world, and the rodless chamber is filled with medium and connected to the hydraulic motor. The rodless chambers of the two hydraulic cylinders are connected to the two oil ports of the hydraulic motor through pipelines respectively. The hydraulic motor is connected to the connecting rod, and the power output end rotates with the gear to drive the gear to rotate.

6. The cable trench cover opening and closing device according to claim 3, characterized in that: The grab and place assembly includes two suction cups, which are respectively connected to two ends of the flexible connector, and the two suction cups are connected to each other and to a negative pressure source through a negative pressure pipeline.

7. The cable trench cover opening and closing device according to claim 6, characterized in that: The grab and release assembly also includes a release mechanism, which includes a valve. The valve is provided with two valve ports, which are respectively connected to the negative pressure pipeline and the outside atmosphere. A trigger block is provided on one side of the valve. When the trigger block is pressed, the two valve ports are connected, and the suction cup is connected to the outside atmosphere.

8. The cable trench cover opening and closing device according to claim 7, characterized in that: The guide tube is provided with a guide groove on the inner wall, and the two sides of the flexible connector are embedded in the guide groove and slidably cooperate with the guide tube. The valve is connected with the flexible connector and is suitable for sliding into or out of the left guide tube with the flexible connector; the release mechanism also includes a slider, a pull block and a spring, the trigger block is arranged on the side of the valve facing away from the flexible connector, the upper end of the trigger block is provided with a first chamfer, and the lower end is provided with a second chamfer, the projection length of the first chamfer in the direction of valve movement is a, and the projection length of the second chamfer in the direction of valve movement is b; the valve faces away from the flexible connector. An accommodating groove is provided on the inner wall of the wire tube on one side of the connecting piece, one end of the slider is arranged in the accommodating groove and slidably cooperates with the guide tube, and the spring clip is arranged between the slider and the bottom of the accommodating groove; one end of the pull block is connected to the slider, and the other end extends out of the guide tube toward the side of the slider facing away from the valve, and the slider is suitable for retracting a preset distance into the accommodating groove; the overlapping length of the projection of the slider and the trigger block in the movement direction of the valve is c, and under normal conditions, a>c>b, and after pulling the pull block to retract the slider to the accommodating groove by a preset distance, a>b>c.

9. The cable trench cover opening and closing device according to claim 1, characterized in that: The lifting arm is provided with a sliding frame and a third driving assembly. The sliding frame is slidably matched with the lifting arm. The third driving assembly is connected to the lifting arm. The power output end is connected to the sliding frame to drive the sliding frame and the lifting arm to slide. The lifting frame is rotatably connected to the sliding frame.

10. The cable trench cover opening and closing device according to claim 9, characterized in that: The state maintaining component includes a right magnet and a left magnet, and the right magnet and the left magnet are both connected to the sliding frame. When the lifting frame is in a right tilted state, the right magnet absorbs the lifting frame, and when the lifting frame is in a left tilted state, the left magnet absorbs the lifting frame.

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