Cover plate opening and closing device

Abstract

A cover plate opening and closing device. The cover plate opening and closing device comprises: at least two fixed shafts, capable of being connected to a cable trench; at least two jacking rods, both extending in a width direction of the cable trench, wherein middle portions of the at least two jacking rods are respectively hingedly connected to the at least two fixed shafts, a first end of each jacking rod is provided with a cover plate mating portion; a connecting rod, separately hingedly connected to second ends of the at least two jacking rods, wherein when a jacking assembly is in a jacking state, the cover plate mating portions can extend upward out of the cable trench, and when the jacking assembly is in a retracted state, the cover plate mating portions can retract downward into the cable trench; a mounting shaft, capable of being connected to the cable trench; and a handle member, having a middle portion hingedly connected to the mounting shaft, a first end extending out of the cable trench, and a second end drivingly connected to the connecting rod. By means of the technical solution provided in the present application, the problems in the related art that when a cable trench cover plate is heavy, the cover plate is difficult to open and close and the safety is low, can be solved.

Description

Cover plate switching device

[0001] This application claims priority to Chinese Patent Application No. 202411685303.1, filed on November 22, 2024, entitled "Cover Plate Switch Device", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This invention relates to the field of cable trench technology, and more specifically, to a cover plate switching device. Background Technology

[0003] With the increasing urbanization process in China, electrical circuits are generally laid in cable trenches during urban construction, and the top of the cable trench is covered with a cover plate to protect the cable trench.

[0004] In related technologies, cable trench covers are provided with pry holes so that construction workers can use a pry bar to pry the cable trench cover relative to the cable trench to open or close the cable trench cover.

[0005] However, the method of using a pry bar and pry hole to open and close the cable trench cover in the relevant technology requires manual operation to lift the cable trench cover. When the cable trench cover is heavy, it is not easy to operate and the safety is low. It is easy to cause personal injury or equipment damage due to the cover falling. Summary of the Invention

[0006] This invention provides a cover plate switching device to solve the problem in related technologies that cable trench covers are difficult to open and close and have low safety when they are heavy.

[0007] This invention provides a cover plate switching device, comprising: at least two fixed shafts arranged in a cable trench along the width direction, the fixed shafts extending along the length direction of the cable trench, and both ends of the fixed shafts being connectable to the cable trench; a lifting assembly including a connecting rod and at least two lifting rods, the at least two lifting rods extending along the width direction of the cable trench, the middle portions of the at least two lifting rods being hinged to the at least two fixed shafts respectively, the first end of the lifting rods being provided with a cover plate mating part, the connecting rod extending along the width direction of the cable trench and hinged to the second ends of the at least two lifting rods, the lifting assembly having a lifting state and a... In the retracted state, when the lifting assembly is in the lifting state, the cover plate mating part can extend upwards out of the cable trench; when the lifting assembly is in the retracted state, the cover plate mating part can retract downwards into the cable trench. The drive handle includes a handle part and a mounting shaft. The mounting shaft extends along the length direction of the cable trench, and both ends of the mounting shaft can be connected to the cable trench. The handle part extends along the width direction of the cable trench, and the middle part of the handle part can be hinged to the mounting shaft. The first end of the handle part extends outside the cable trench, and the second end of the handle part extends into the cable trench. The second end of the handle part is driven by a connecting rod to drive the lifting assembly to switch between the lifting state and the retracted state.

[0008] Furthermore, the cable trench includes a main trench and an accessory trench that are connected in its width direction. The cover switch device also includes a sealing cloth and a transmission rod. The sealing cloth is arranged perpendicular to the width direction of the cable trench to isolate the main trench and the accessory trench. The transmission rod passes through the sealing cloth. The second end of the handle extends into the accessory trench. One end of the transmission rod is hinged to the second end of the handle, and the other end of the transmission rod is hinged to the connecting rod.

[0009] Furthermore, the sealing cloth includes a pleated body and a sealing ring. The pleated body is arranged perpendicularly to the width direction of the cable trench to isolate the main trench and the accessory trench. The pleated body has a clearance hole to avoid the transmission rod. The sealing ring surrounds the outside of the clearance hole and is connected to the pleated body. The transmission rod is movably inserted through the sealing ring.

[0010] Furthermore, the sealing cloth also includes a water-absorbing ring, which is located on the side of the sealing ring located in the accessory groove, and the transmission rod is movably inserted through the water-absorbing ring.

[0011] Furthermore, the handle includes an operating section and a working section connected at an angle. The operating section is located outside the cable trench, the middle of the working section is hinged to the mounting shaft, and the end of the working section opposite to the operating section is connected to the linkage drive. When the lifting assembly is in the retracted state, the operating section is set laterally.

[0012] Furthermore, the distance between the end of the operating section away from the working section and the mounting shaft is greater than the distance between the end of the working section away from the operating section and the mounting shaft.

[0013] Furthermore, the lifting rod includes a bent rod, which includes a first rod segment and a second rod segment connected to each other and arranged at an angle. The connection between the first rod segment and the second rod segment is hinged to a fixed shaft. The cover plate mating part is located at the end of the first rod segment opposite to the second rod segment. The connecting rod is hinged to the end of the second rod segment opposite to the first rod segment.

[0014] Furthermore, the cover plate switching device includes at least two lifting assemblies arranged along the length of the cable trench, and the handle is driven to the linkage of the at least two lifting assemblies.

[0015] Furthermore, the handle includes a grip rod and at least two drive rods, the at least two drive rods being arranged along the length of the cable trench, the middle portion of each of the at least two drive rods being hinged to a mounting shaft, the first end of each of the at least two drive rods extending outside the cable trench, the second end of each of the at least two drive rods extending into the cable trench, and the second end of each of the at least two drive rods being connected to the linkage of each of the at least two lifting assemblies in a corresponding manner.

[0016] Furthermore, the cover plate mating part includes a cover plate mounting block and a hinge shaft. The cover plate mounting block can be connected to the lower surface of the cable trench cover plate, and the hinge shaft extends along the length of the cable trench and is disposed at the first end of the lifting rod. The hinge shaft is hinged to the cover plate mounting block.

[0017] According to the technical solution of this invention, the cover plate switching device includes a lifting assembly, a drive handle, and at least two fixed shafts. When it is necessary to open or close the cable trench cover, a torque is applied to the first end of the handle outside the cable trench to make the handle rotate around the mounting shaft. The second end of the handle drives the connecting rod to move, so that the connecting rod applies torque to the second end of the lifting rod, causing the lifting rod to rotate around the fixed shaft. Thus, the first end of the lifting rod drives the cable trench cover to move up and down through the cover plate mating part to realize the opening and closing of the cable trench cover. In this process, since the connecting rod can drive at least two lifting rods to rotate, the cable trench cover is opened and closed using at least two lifting rods, increasing the force points of the cable trench cover. Therefore, only one person needs to operate the handle to realize the opening and closing of the cable trench cover, thereby improving the operating efficiency and operating safety. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0019] Figure 1 shows a schematic diagram of the cover plate switching device provided according to an embodiment of the present invention;

[0020] Figure 2 shows a top view of a cover plate switching device provided according to an embodiment of the present invention;

[0021] Figure 3 shows a cross-sectional view of the sealing cloth of the cover plate switching device provided according to an embodiment of the present invention.

[0022] The above-mentioned drawings include the following reference numerals: 1. Cable trench; 2. Cable trench cover; 3. Main trench; 4. Accessory trench; 10. Fixed shaft; 20. Lifting assembly; 21. Connecting rod; 22. Lifting rod; 221. Cover plate mating part; 2211. Cover plate mounting block; 2212. Hinge shaft; 222. Bending rod; 2221. First rod segment; 2222. Second rod segment; 30. Drive handle; 31. Handle piece; 311. Operating section; 312. Working section; 313. Grip rod; 314. Drive rod; 32. Mounting shaft; 40. Sealing cloth; 41. Pleated main body; 42. Sealing ring; 43. Water absorption ring; 50. Transmission rod; X, length direction of cable trench; Y, width direction of cable trench. Detailed Implementation

[0023] 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. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. 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.

[0024] As shown in Figures 1 to 3, this embodiment of the invention provides a cover plate switching device. The cover plate switching device includes a lifting assembly 20, a drive handle 30, and at least two fixed shafts 10. The at least two fixed shafts 10 are arranged in the cable trench 1 along the width direction of the cable trench 1 and extend along the length direction of the cable trench 1. Both ends of the fixed shafts 10 can be connected to the cable trench 1. The lifting assembly 20 includes a connecting rod 21 and at least two lifting rods 22. The at least two lifting rods 22 extend along the width direction of the cable trench 1, and the middle portions of the at least two lifting rods 22 are hinged to the at least two fixed shafts 10 respectively. The first end of the lifting rod 22 is provided with a cover plate mating part 221. The connecting rod 21 extends along the width direction of the cable trench 1 and is hinged to the second ends of the at least two lifting rods 22. The lifting assembly 20 has a lifting state and a retracted state. When the lifting assembly 20 is in the lifting state, the cover plate mating part 221 can extend upward from the cable trench 1. When the lifting assembly 20 is in the retracted state, the cover plate mating part 221 can be retracted downward into the cable trench 1. The drive handle 30 includes a handle part 31 and a mounting shaft 32. The mounting shaft 32 extends along the length direction of the cable trench 1, and both ends of the mounting shaft 32 can be connected to the cable trench 1. The handle part 31 extends along the width direction of the cable trench 1, and the middle part of the handle part 31 can be hinged to the mounting shaft 32. The first end of the handle part 31 extends outside the cable trench 1, and the second end of the handle part 31 extends into the cable trench 1. The second end of the handle part 31 is driven to connect to the connecting rod 21 to drive the lifting assembly 20 to switch between the lifting state and the retracted state.

[0025] The cover switch device provided in this embodiment includes a lifting assembly 20, a drive handle 30, and at least two fixed shafts 10. When it is necessary to open or close the cable trench cover, a torque is applied to the first end of the handle 31 outside the cable trench 1 to make the handle 31 rotate around the mounting shaft 32. The second end of the handle 31 drives the connecting rod 21 to move, so that the connecting rod 21 applies torque to the second end of the lifting rod 22, so that the lifting rod 22 rotates around the fixed shaft 10. Thus, the first end of the lifting rod 22 drives the cable trench cover to move up and down through the cover mating part 221 to realize the opening and closing of the cable trench cover. In this process, since the connecting rod 21 can drive at least two lifting rods 22 to rotate, the cable trench cover is opened and closed by using at least two lifting rods 22, increasing the force points of the cable trench cover. Thus, only one person needs to operate the handle 31 to realize the opening and closing of the cable trench cover, thereby improving the operating efficiency and operating safety.

[0026] Furthermore, the cover plate switching device provided in this embodiment uses the cover plate mating part 221 to lift the lower surface of the cable trench cover plate, eliminating the need to open pry holes in the cable trench cover plate, making it suitable for use in rainy or waterlogged environments.

[0027] It should be noted that the length direction of cable trench 1 refers to the X direction marked in Figure 2, and the width direction of cable trench 1 refers to the Y direction marked in Figure 2.

[0028] As shown in Figure 1, the cable trench 1 includes a main trench 3 and an accessory trench 4 connected in its width direction. The cover plate switching device also includes a sealing cloth 40 and a transmission rod 50. The sealing cloth 40 is set perpendicular to the width direction of the cable trench 1 to isolate the main trench 3 and the accessory trench 4. The transmission rod 50 passes through the sealing cloth 40. The second end of the handle 31 extends into the accessory trench 4. One end of the transmission rod 50 is hinged to the second end of the handle 31, and the other end of the transmission rod 50 is hinged to the connecting rod 21.

[0029] Specifically, when the handle 31 moves, the transmission rod 50 is movably inserted through the sealing cloth 40 along its axial direction, so as to realize the indirect transmission between the handle 31 and the connecting rod 21 through the transmission rod 50. At the same time, the sealing cloth 40 is used to isolate the main trench 3 and the accessory trench 4 to prevent water or small animals in the accessory trench 4 from entering the main trench 3 and causing damage. Specifically, the cable trench cover is installed on the main trench 3.

[0030] As shown in Figure 3, the sealing cloth 40 includes a pleated body 41 and a sealing ring 42. The pleated body 41 is arranged perpendicularly to the width direction of the cable trench 1 to isolate the main trench 3 and the accessory trench 4. The pleated body 41 has a clearance hole to avoid the transmission rod 50. The sealing ring 42 surrounds the outside of the clearance hole and is connected to the pleated body 41. The transmission rod 50 is movably inserted through the sealing ring 42.

[0031] Since the transmission rod 50 passes through the pleated body 41, when the handle 31 drives the transmission rod 50 to move, if the transmission rod 50 moves in the height direction of the cable trench, the pleated body 41 can deform with the movement of the transmission rod 50 in the height direction of the cable trench to maintain the protective performance of the sealing cloth 40.

[0032] Furthermore, by setting the sealing ring 42, the sealing effect between the transmission rod 50 and the clearance hole can be improved.

[0033] It should be noted that the main trench 3 is used to lay and store cables, while the accessory trench 4 is mainly used to store operating tools. Drainage holes are provided on the bottom wall of the accessory trench 4 to drain the water accumulated in the accessory trench 4. Protective nets are installed at the drainage holes to prevent animals such as rats from entering the accessory trench 4, and to prevent solid waste such as fallen rocks or leaves in the accessory trench 4 from entering through the drainage holes and blocking the drainage channel.

[0034] As shown in Figure 3, the sealing cloth 40 also includes a water-absorbing ring 43, which is located on one side of the sealing ring 42 in the accessory groove 4, and the transmission rod 50 is movably inserted through the water-absorbing ring 43.

[0035] Specifically, when the transmission rod 50 moves along its axial direction relative to the pleated body 41, by setting the water-absorbing ring 43 on one side of the sealing ring 42 located in the accessory groove 4, and by movably passing the transmission rod 50 through the water-absorbing ring 43, the water-absorbing ring 43 can absorb the water droplets and moisture on the part of the transmission rod 50 located in the accessory groove 4, thus preventing the transmission rod 50 from bringing this part of the moisture into the main body groove 3.

[0036] As shown in Figure 1, the handle 31 includes an operating section 311 and a working section 312 connected at an angle. The operating section 311 is located outside the cable trench 1, and the middle of the working section 312 is hinged to the mounting shaft 32. The end of the working section 312 opposite to the operating section 311 is driven by the connecting rod 21. When the lifting assembly 20 is in the retracted state, the operating section 311 is arranged laterally. By connecting the operating section 311 and the working section 312 at an angle, the size of the handle 31 in the width direction of the cable trench is reduced while keeping the lengths of the operating section 311 and the working section 312 unchanged. This makes the cover switch device compact and helps to achieve structural miniaturization. Furthermore, when the lifting assembly 20 is in the retracted state, the operating section 311 is arranged laterally, reducing the space occupied by the handle 31 above the cable trench cover, thus avoiding obstruction of pedestrian and vehicle traffic in narrow urban streets or densely populated areas.

[0037] In this embodiment, when the lifting component 20 is in the lifting state, the operation section 311 is set vertically.

[0038] As shown in Figure 1, the distance between the end of the operating section 311 away from the working section 312 and the mounting shaft 32 is greater than the distance between the end of the working section 312 away from the operating section 311 and the mounting shaft 32.

[0039] With the above arrangement, when the handle 31 is operated, it forms a lever structure. According to the lever principle, when a driving force is applied to the long arm end of the lever structure (i.e., the end of the operating section 311 that is away from the working section 312), the short arm end of the lever structure (i.e., the end of the working section 312 that is away from the operating section 311) outputs a force greater than the driving force, thereby achieving the effect of saving effort.

[0040] As shown in Figure 1, the lifting rod 22 includes a bent rod 222, which includes a first rod segment 2221 and a second rod segment 2222 connected to each other and arranged at an angle. The connection between the first rod segment 2221 and the second rod segment 2222 is hinged to the fixed shaft 10. The cover plate mating part 221 is located at the end of the first rod segment 2221 that is away from the second rod segment 2222. The connecting rod 21 is hinged to the end of the second rod segment 2222 that is away from the first rod segment 2221.

[0041] By connecting the first rod segment 2221 and the second rod segment 2222 at an angle, while keeping the lengths of the first rod segment 2221 and the second rod segment 2222 unchanged, the size of the lifting rod 22 in the width direction of the cable trench is reduced, making the cover plate switch device compact and helping to achieve structural miniaturization.

[0042] In this embodiment, the length of the second rod segment 2222 is greater than the length of the first rod segment 2221, so that the lifting rod 22 forms a lever structure. According to the lever principle, when a driving force is applied to the long arm end of the lever structure (i.e. the end of the second rod segment 2222 that is away from the first rod segment 2221), the short arm end of the lever structure (i.e. the end of the first rod segment 2221 that is away from the second rod segment 2222) can output a force greater than the driving force, thereby achieving the effect of saving effort.

[0043] In this embodiment, the second rod segment 2222 adopts an arc-shaped structure, and the middle part of the second rod segment 2222 protrudes in a direction away from the first rod segment 2221, making the movement trajectory of the lifting rod 22 smoother and reducing movement resistance.

[0044] As shown in Figure 2, the cover plate switching device includes at least two lifting components 20 arranged along the length of the cable trench 1, and the handle 31 is driven to be connected to the connecting rod 21 of the at least two lifting components 20.

[0045] Since the handle 31 is driven to connect with the connecting rods 21 of at least two lifting components 20, the cable trench cover is opened and closed by using at least two lifting components 20, which increases the stress points of the cable trench cover. Thus, the cable trench cover can be opened and closed by only one person operating the handle 31, thereby improving operating efficiency and safety.

[0046] As shown in Figure 2, the handle 31 includes a gripping rod 313 and at least two drive rods 314. The at least two drive rods 314 are arranged along the length of the cable trench 1. The middle part of each of the at least two drive rods 314 is hinged to the mounting shaft 32. The first end of each of the at least two drive rods 314 extends outside the cable trench 1, and the second end of each of the at least two drive rods 314 extends into the cable trench 1. The second ends of each of the at least two drive rods 314 are driven to connect to the connecting rods 21 of the at least two lifting assemblies 20.

[0047] Specifically, by applying torque to the holding rod 313 by a single operator, at least two lifting components 20 can be driven simultaneously by at least two drive rods 314 to open and close the cable trench cover, increasing the force points on the cable trench cover. Thus, the cable trench cover can be opened and closed with only a single application of torque, improving operational efficiency and safety.

[0048] As shown in Figure 1, the cover plate mating part 221 includes a cover plate mounting block 2211 and a hinge shaft 2212. The cover plate mounting block 2211 can be connected to the lower surface of the cable trench cover 2. The hinge shaft 2212 extends along the length of the cable trench 1 and is located at the first end of the lifting rod 22. The hinge shaft 2212 is hinged to the cover plate mounting block 2211. The cover plate mating part 221 with the above structure, by connecting the cover plate mounting block 2211 to the lower surface of the cable trench cover 2, can further prevent the cable trench cover from falling off and improve operational safety.

[0049] The cover plate switching device provided in this embodiment has the following beneficial effects:

[0050] (1) Increase the stress points of the cable trench cover so that the cable trench cover can be opened and closed by a single person operating the handle 31, thereby improving operating efficiency and safety.

[0051] (2) The lifting rod 22 and the handle 31 are based on the lever principle and have the effect of saving effort.

[0052] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0053] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0054] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms 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 should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0055] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0056] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0057] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A cover plate switching device, characterized in that, The cover plate switching device includes: At least two fixed shafts (10) are arranged in the cable trench (1) in a way that is oriented along the width direction of the cable trench (1). The fixed shafts (10) extend along the length direction of the cable trench (1), and both ends of the fixed shafts (10) are connected to the cable trench (1). The lifting assembly (20) includes a connecting rod (21) and at least two lifting rods (22). The at least two lifting rods (22) extend along the width direction of the cable trench (1). The middle parts of the at least two lifting rods (22) are hinged to at least two fixed shafts (10) in a corresponding manner. The first end of the lifting rod (22) is provided with a cover plate mating part (221). The connecting rod (21) extends along the width direction of the cable trench (1) and is hinged to the second end of the at least two lifting rods (22). The lifting assembly (20) has a lifting state and a retracted state. When the lifting assembly (20) is in the lifting state, the cover plate mating part (221) can extend upward out of the cable trench (1). When the lifting assembly (20) is in the retracted state, the cover plate mating part (221) can be retracted downward into the cable trench (1). The drive handle (30) includes a handle part (31) and a mounting shaft (32). The mounting shaft (32) extends along the length direction of the cable trench (1), and both ends of the mounting shaft (32) can be connected to the cable trench (1). The handle part (31) extends along the width direction of the cable trench (1), and the middle part of the handle part (31) can be hinged to the mounting shaft (32). The first end of the handle part (31) extends outside the cable trench (1), and the second end of the handle part (31) extends inside the cable trench (1). The second end of the handle part (31) is driven to connect to the connecting rod (21) to drive the lifting assembly (20) to switch between the lifting state and the storage state.

2. The cover plate switching device according to claim 1, characterized in that, The cable trench (1) includes a main trench (3) and an accessory trench (4) connected in its width direction. The cover plate switching device also includes a sealing cloth (40) and a transmission rod (50). The sealing cloth (40) is arranged perpendicular to the width direction of the cable trench (1) to isolate the main trench (3) and the accessory trench (4). The transmission rod (50) passes through the sealing cloth (40). The second end of the handle (31) extends into the accessory trench (4). One end of the transmission rod (50) is hinged to the second end of the handle (31), and the other end of the transmission rod (50) is hinged to the connecting rod (21).

3. The cover plate switching device according to claim 2, characterized in that, The sealing cloth (40) includes a pleated body (41) and a sealing ring (42). The pleated body (41) is arranged perpendicularly to the width direction of the cable trench (1) to isolate the main trench (3) and the accessory trench (4). The pleated body (41) has a clearance hole to avoid the transmission rod (50). The sealing ring (42) surrounds the outside of the clearance hole and is connected to the pleated body (41). The transmission rod (50) is movably inserted through the sealing ring (42).

4. The cover plate switching device according to claim 3, characterized in that, The sealing cloth (40) also includes a water-absorbing ring (43), which is disposed on one side of the sealing ring (42) located in the accessory groove (4), and the transmission rod (50) is movably inserted through the water-absorbing ring (43).

5. The cover plate switching device according to claim 1, characterized in that, The handle (31) includes an operating section (311) and a working section (312) connected at an angle. The operating section (311) is located outside the cable trench (1). The middle part of the working section (312) is hinged to the mounting shaft (32). One end of the working section (312) opposite to the operating section (311) is driven to connect to the connecting rod (21). When the lifting assembly (20) is in the retracted state, the operating section (311) is arranged laterally.

6. The cover plate switching device according to claim 5, characterized in that, The distance between the end of the operating section (311) away from the working section (312) and the mounting shaft (32) is greater than the distance between the end of the working section (312) away from the operating section (311) and the mounting shaft (32).

7. The cover plate switching device according to claim 1, characterized in that, The lifting rod (22) includes a bent rod (222), which includes a first rod segment (2221) and a second rod segment (2222) connected to each other and arranged at an angle. The connection between the first rod segment (2221) and the second rod segment (2222) is hinged to the fixed shaft (10). The cover plate mating part (221) is provided at the end of the first rod segment (2221) away from the second rod segment (2222). The connecting rod (21) is hinged to the end of the second rod segment (2222) away from the first rod segment (2221).

8. The cover plate switching device according to claim 1, characterized in that, The cover plate switching device includes at least two lifting assemblies (20) arranged along the length of the cable trench (1), and the handle (31) is driven to be connected to the connecting rod (21) of the at least two lifting assemblies (20).

9. The cover plate switching device according to claim 8, characterized in that, The handle (31) includes a gripping rod (313) and at least two drive rods (314). The at least two drive rods (314) are arranged along the length of the cable trench (1). The middle part of each of the at least two drive rods (314) is hinged to the mounting shaft (32). The first end of each of the at least two drive rods (314) extends outside the cable trench (1), and the second end of each of the at least two drive rods (314) extends inside the cable trench (1). The second ends of each of the at least two drive rods (314) are driven to connect to the connecting rods (21) of each of the at least two lifting assemblies (20).

10. The cover plate switching device according to claim 1, characterized in that, The cover plate mating part (221) includes a cover plate mounting block (2211) and a hinge shaft (2212). The cover plate mounting block (2211) can be connected to the lower surface of the cable trench cover (2). The hinge shaft (2212) extends along the length direction of the cable trench (1) and is disposed at the first end of the lifting rod (22). The hinge shaft (2212) is hinged to the cover plate mounting block (2211).

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