Hydraulic manhole cover

Abstract

The present invention discloses a hydraulic manhole cover and relates to the technical field of manhole covers. The present invention comprises a base, wherein the bottom surface of the base is fixedly connected with a bottom frame. When the cover is closed, the limit shaft is clamped into a V-shaped clamping groove, forcing the chuck and the third gear to rotate, so that the second rack and the cross plate move downward, and the fourth spring is deformed, and the clamping block can be clamped into the rectangular clamping groove, so that the cover and the base are quickly locked. When disassembling, the clamping block is pulled out of the rectangular clamping groove by the convex block, so that the fourth spring pops out the limit shaft clamped in the chuck, and the cover can be quickly opened by the hydraulic strut, which is convenient to use. When the cover rotates, the hydraulic strut transmission pin can be plugged and matched with the positioning hole on the convex plate, so that the anti-fall frame slidably installed in the base can be installed more stably, and the anti-fall frame is easy to disassemble and assemble. The cover is supported by four connecting blocks, so that the bearing capacity of the cover is increased and the overall structure is more solid.

Description

Technical Field

[0001] The invention relates to the technical field of manhole covers, in particular to a hydraulic manhole cover. Background Art

[0002] Background technology: In view of the above problems, the inventors have proposed a hydraulic manhole cover to solve the above problems. Summary of the invention

[0003] In order to solve the above problems, the object of the present invention is to provide a hydraulic manhole cover.

[0004] To solve the above technical problems, the present invention adopts the following technical scheme: a hydraulic manhole cover comprises a base, the bottom surface of the base is fixedly connected to a bottom frame, an installation groove is opened at an inner wall of one side of the base, a clamping device and a locking assembly are installed in the installation groove, the clamping device and the locking assembly are transmission connected, a cover plate is rotatably connected to the base, a second limiting device is installed on the bottom surface of the cover plate, the second limiting device is respectively clamped and connected with the clamping device and the locking assembly, a guide assembly is installed at the inner wall of the base, the guide assembly is connected with an anti-fall frame, the cover plate is transmission connected with a first limiting device, the first limiting device is clamped and connected with the guide assembly, when the cover plate is rotated along the base to be closed, the cover plate drives the first limiting device to limit the guide assembly, so that the anti-fall frame can be stably installed in the base, and the second limiting device is respectively connected with the clamping device and the locking assembly, so that the cover plate can be locked with the base.

[0005] Preferably, two hinge blocks are fixedly provided on one side surface of the base, and a cover plate is rotatably connected inside the hinge block, and a plurality of corner blocks are fixedly provided between the outer surface of the base and the upper surface of the bottom frame, and the base and the bottom frame are reinforced and fixed by the plurality of corner blocks; the mounting groove includes a cross groove, a first rectangular groove is provided on both sides of the cross groove, a third rectangular groove is provided on the inner surface of the cross groove, a first sliding groove is provided on the inner wall of the first rectangular groove, a second rectangular groove is connected between the two first rectangular grooves, the inner wall of the cross groove is rotatably connected to the clamping device, and the first sliding groove is slidably connected to the locking component, and the two first rectangular grooves and one second rectangular groove are in an I shape and are connected to the third rectangular groove.

[0006] Preferably, the clamping device includes two chucks, the chucks are provided with a plurality of V-shaped grooves, the inner walls of the V-shaped grooves are arc-shaped, the V-shaped grooves are clamped and connected to the second limiting device, the chucks are fixedly provided with a rotating shaft, the rotating shafts are respectively rotatably connected to the inner walls of the cross grooves, one end of the rotating shaft is arranged in the first rectangular groove and fixedly connected to a third gear, the third gear is transmission-connected to the locking assembly, the chuck drives the third gear to rotate via the rotating shaft, the V-shaped grooves on the chucks can be clamped and connected to the second limiting device, and the third gear can be limited by the locking assembly; the locking assembly includes two second racks, the two second racks are respectively meshed and connected with a third gear, and the second rack inner wall is provided with a rotating shaft. A convex slider is fixed on the side surface, and the convex slider is slidably arranged in the first sliding groove, and a fixed rod is slidably connected in the convex slider, and the fixed rod is fixedly arranged at the inner wall of the first sliding groove, and a fourth spring is sleeved on the outer surface of the fixed rod, and the fourth spring is fixedly arranged between the convex slider and the inner wall of the first sliding groove, and a cross plate is fixedly arranged between the two second racks, and the cross plate is slidably arranged in the second rectangular groove, and a rectangular card groove is opened on the surface of the cross plate, and the rectangular card groove is connected with the third rectangular groove, and the second limiting device is card-connected in the rectangular card groove, and the third gear drives the second rack and the convex slider to slide downward along the first sliding groove, and squeezes the fourth spring to move the cross plate downward, and make the rectangular card groove connected with the third rectangular groove.

[0007] Preferably, the second limiting device includes a rectangular block, the rectangular block is fixedly arranged on the bottom surface of the cover plate, limiting shafts are fixedly arranged on both side surfaces of the rectangular block, the limiting shafts are clamped in the V-shaped groove, a clamping block is slidably connected in the rectangular block, one end surface of the clamping block is provided with a bevel, the clamping block is clamped in the rectangular groove, a convex block is fixedly connected to the clamping block, two third springs are fixedly arranged between the convex block and the rectangular block, when the cover plate is rotated along the base to be closed, the limiting shafts on both sides of the rectangular block are clamped in the V-shaped groove, the clamping block slides into the third rectangular groove through the bevel, and is clamped in the rectangular groove, so as to realize The third gear is now limited so that the limit shaft can be locked in the V-shaped groove; a rectangular through groove is opened on the cover plate, and the rectangular through groove is arranged at the convex block. Rotating blocks are fixedly provided on the bottom surfaces of both ends of the cover plate, and the rotating blocks are rotatably connected with hydraulic support rods. The bottom end of the hydraulic support rod is rotatably arranged on the inner wall of the base, and a first gear is fixedly provided at the bottom end of the hydraulic support rod. The first gear is transmission-connected with the first limiting device. When the cover plate is opened, the convex block pulls the block out of the rectangular groove through the rectangular through groove, thereby opening the cover plate through the hydraulic support rod, and when the cover plate rotates, it can rotate through the first gear at the bottom end of the hydraulic support rod.

[0008] Preferably, the first limiting device includes two first guide rails, the two first guide rails are respectively fixed at the inner walls on both sides of the base, a second slide groove is opened on the side of the first guide rail, a first rack is slidably connected in the second slide groove, the first rack is meshed with a second gear, the second gear is rotatably connected to the inner wall of the base, the second gear is meshed with the first gear, one end of the first rack is fixedly connected to a latch, the outer surface of the latch is sleeved with a first spring, the first spring is fixedly arranged between the first rack and the inner wall of the second slide groove, the latch is plug-matched with the guide assembly, the first gear drives the second gear to rotate, so that the first rack slides along the first guide rail, so that the latch is plug-matched with the guide assembly; the guide assembly includes four second guide rails, the second guide rails are respectively fixed at the four inner walls of the base, the second guide rails are respectively provided with a third slide groove, and the third slide groove is slidably arranged in the A convex plate is provided, wherein the convex plate and the inner wall of the third slide groove are both provided with a positioning hole, and the inner bottom surface of the third slide groove is fixedly provided with a second spring, the upper end of the second spring is fitly connected with the bottom surface of the convex plate, and a movably plug-in pin is arranged in the positioning hole, and the upper surface of the convex plate is fixedly provided with a connecting block, the upper surface of the connecting block is fitly connected with the bottom surface of the cover plate, and the connecting block is fixedly connected to the anti-falling frame, and the anti-falling frame is slidably installed inside the base along the second guide rail through the convex plate at the bottom end of the connecting block, and the convex plate presses the second spring, and when the cover plate presses the connecting block downward, the second spring can be deformed, which can support the cover plate, and the pin is plug-in and connected with the positioning hole, so that the anti-falling frame can be stably installed inside the base; the anti-falling frame is rectangular, and a plurality of leakage holes are provided on the inner bottom surface of the anti-falling frame, and four lifting chains are fixedly provided on the upper surface of the anti-falling frame, and the upper end of the lifting chain is fixedly connected to the connecting block, and the anti-falling frame is fixedly connected to the connecting block through the four lifting chains, which is convenient for installation and disassembly.

[0009] Compared with the prior art, the present invention has the following beneficial effects:

[0010] 1. When the cover is closed, the limit shaft is inserted into the V-shaped slot, forcing the chuck and the third gear to rotate, so that the second rack and the cross plate move downward, and the fourth spring is deformed, and the card block can be inserted into the rectangular slot, so that the cover and the base are quickly locked. When disassembling, the card block is pulled out of the rectangular slot by the convex block, so that the fourth spring pops out the limit shaft engaged in the chuck, and the cover can be quickly opened by the hydraulic support rod, which is convenient to use;

[0011] 2. When the cover plate rotates, the hydraulic support rod transmission pin can be plugged into the positioning hole on the convex plate, making the anti-fall frame slidably installed in the base more stable. The anti-fall frame is easy to disassemble and assemble, and the cover plate is supported by four connecting blocks, which increases the bearing capacity of the cover plate and makes the overall structure more solid. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 It is a schematic diagram of the structure of the present invention.

[0014] Figure 2 It is a schematic diagram of the structural base and cover plate of the present invention.

[0015] Figure 3 It is a schematic diagram of the second limiting device of the structure of the present invention.

[0016] Figure 4 It is a schematic diagram of the structural installation groove of the present invention.

[0017] Figure 5 It is a schematic diagram of the anti-fall frame structure of the present invention.

[0018] Figure 6 It is a schematic diagram of the first limiting device and the guide assembly of the structure of the present invention.

[0019] Figure 7 It is a schematic diagram of the structural clamping device and locking assembly of the present invention.

[0020] In the figure: 1, base; 11, hinge block; 12, mounting groove; 121, cross groove; 122, first rectangular groove; 123, second rectangular groove; 124, first slide groove; 125, third rectangular groove; 13, bottom frame; 14, corner block; 2, cover plate; 21, rotating block; 22, hydraulic support rod; 23, first gear; 24, rectangular through groove; 3, first limit device; 31, second gear; 32, first guide rail; 321, second slide groove; 33, first rack; 34, latch; 35, first spring; 4, guide assembly; 41, second guide rail; 411, first three slide grooves; 42, connecting block; 43, convex plate; 431, positioning hole; 44, second spring; 5, anti-fall frame; 51, leakage hole; 52, lifting chain; 6, second limiting device; 61, rectangular block; 62, limiting shaft; 63, clamping block; 631, bevel edge; 64, third spring; 65, convex block; 7, clamping device; 71, chuck; 711, V-shaped clamping groove; 72, rotating shaft; 73, third gear; 8, locking assembly; 81, second rack; 82, convex slider; 83, fixing rod; 84, fourth spring; 85, horizontal plate; 851, rectangular clamping groove. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Embodiment 1: Figure 1-7 As shown, the present invention provides a hydraulic manhole cover, including a base 1, a bottom surface of the base 1 is fixedly connected to a bottom frame 13, a mounting groove 12 is opened on the inner wall of one side of the base 1, a clamping device 7 and a locking assembly 8 are installed in the mounting groove 12, the clamping device 7 and the locking assembly 8 are transmission connected, a cover plate 2 is rotatably connected to the base 1, a second limiting device 6 is installed on the bottom surface of the cover plate 2, the second limiting device 6 is clamped and connected to the clamping device 7 and the locking assembly 8 respectively, a guide assembly 4 is installed on the inner wall of the base 1, the guide assembly 4 is connected to an anti-fall frame 5, the cover plate 2 is transmission connected to the first limiting device 3, and the first limiting device 3 is clamped and connected to the guide assembly 4.

[0023] By adopting the above technical solution, when the cover 2 is rotated and closed along the base 1, the cover 2 transmits the first limiting device 3 to limit the guide assembly 4, so that the anti-fall frame 5 can be stably installed in the base 1, and the second limiting device 6 is respectively connected to the clamping device 7 and the locking assembly 8, so that the cover 2 can be locked with the base 1.

[0024] Two hinge blocks 11 are fixedly provided on one side surface of the base 1 , and the hinge blocks 11 are rotatably connected to the cover plate 2 . A plurality of corner blocks 14 are fixedly provided between the outer surface of the base 1 and the upper surface of the bottom frame 13 .

[0025] By adopting the above technical solution, the base 1 and the bottom frame 13 are reinforced and fixed by a plurality of corner blocks 14 .

[0026] The mounting groove 12 includes a cross groove 121, first rectangular grooves 122 are provided on both sides of the cross groove 121, a third rectangular groove 125 is provided on the inner surface of the cross groove 121, a first sliding groove 124 is provided on the inner wall of the first rectangular groove 122, a second rectangular groove 123 is connected between the two first rectangular grooves 122, the inner wall of the cross groove 121 is rotatably connected to the clamping device 7, and the first sliding groove 124 is slidably connected to the locking component 8.

[0027] By adopting the above technical solution, the two first rectangular grooves 122 and the one second rectangular groove 123 are in an I-shape and are connected to the third rectangular groove 125 .

[0028] The clamping device 7 includes two chucks 71, and a plurality of V-shaped grooves 711 are provided on the chucks 71. The inner wall of the V-shaped grooves 711 is arc-shaped. The second limiting device 6 is clamped in the V-shaped grooves 711. A rotating shaft 72 is fixedly provided in the chucks 71. The rotating shaft 72 is rotatably connected to the inner wall of the cross groove 121 respectively. One end of the rotating shaft 72 is arranged in the first rectangular groove 122 and is fixedly connected to the third gear 73. The third gear 73 is transmission-connected to the locking assembly 8.

[0029] By adopting the above technical solution, the chuck 71 drives the third gear 73 to rotate through the rotating shaft 72, the V-shaped groove 711 on the chuck 71 can be connected to the second limiting device 6, and the third gear 73 can be limited by the locking assembly 8.

[0030] The locking assembly 8 includes two second racks 81, and the two second racks 81 are respectively meshed with a third gear 73. A convex slider 82 is fixedly arranged on the inner surface of the second rack 81, and the convex slider 82 is slidably arranged in the first slide groove 124. A fixing rod 83 is slidably connected in the convex slider 82, and the fixing rod 83 is fixedly arranged at the inner wall of the first slide groove 124. A fourth spring 84 is sleeved on the outer surface of the fixing rod 83, and the fourth spring 84 is fixedly arranged between the convex slider 82 and the inner wall of the first slide groove 124. A cross plate 85 is fixedly arranged between the two second racks 81, and the cross plate 85 is slidably arranged in the second rectangular groove 123. A rectangular card groove 851 is opened on the surface of the cross plate 85, and the rectangular card groove 851 is communicated with the third rectangular groove 125, and the second limiting device 6 is connected in the rectangular card groove 851.

[0031] By adopting the above technical solution, the third gear 73 drives the second rack 81 and the convex slider 82 to slide downward along the first slide groove 124 and squeeze the fourth spring 84 to move the cross plate 85 downward and connect the rectangular slot 851 with the third rectangular slot 125.

[0032] The second limiting device 6 includes a rectangular block 61, which is fixed on the bottom surface of the cover plate 2. Limiting shafts 62 are fixed on the inner and outer surfaces of the rectangular block 61. The limiting shafts 62 are clamped in the V-shaped clamping groove 711. A clamping block 63 is slidably connected in the rectangular block 61. A hypotenuse 631 is provided on one end surface of the clamping block 63. The clamping block 63 is clamped in the rectangular clamping groove 851. The clamping block 63 is fixedly connected to a convex block 65. Two third springs 64 are fixedly provided between the convex block 65 and the rectangular block 61.

[0033] By adopting the above technical solution, when the cover 2 is rotated and closed along the base 1, the limiting shafts 62 on both sides of the rectangular block 61 are engaged in the V-shaped groove 711, and the block 63 slides into the third rectangular groove 125 through the bevel 631 and is engaged in the rectangular groove 851, thereby limiting the third gear 73 and enabling the limiting shaft 62 to be locked in the V-shaped groove 711.

[0034] A rectangular through groove 24 is provided on the cover plate 2, and the rectangular through groove 24 is provided at the convex block 65. A rotating block 21 is fixedly provided on the bottom surface of both ends of the cover plate 2, and a hydraulic support rod 22 is rotatably connected to the rotating block 21. The bottom end of the hydraulic support rod 22 is rotatably provided on the inner wall of the base 1, and a first gear 23 is fixedly provided at the bottom end of the hydraulic support rod 22, and the first gear 23 is transmission-connected to the first limit device 3.

[0035] By adopting the above technical solution, when opening the cover 2, the convex block 65 pulls the block 63 out of the rectangular slot 851 through the rectangular through slot 24, so that the cover 2 is opened through the hydraulic support rod 22, and when the cover 2 rotates, it can rotate through the first gear 23 at the bottom end of the hydraulic support rod 22.

[0036] The first limiting device 3 includes two first guide rails 32, and the two first guide rails 32 are respectively fixed on the inner walls of both sides of the base 1. A second slide groove 321 is opened on the side of the first guide rail 32, and a first rack 33 is slidably connected in the second slide groove 321. The first rack 33 is meshed with the second gear 31, and the second gear 31 is rotatably connected to the inner wall of the base 1. The second gear 31 is meshed with the first gear 23, and one end of the first rack 33 is fixedly connected with a latch 34. The outer surface of the latch 34 is sleeved with a first spring 35. The first spring 35 is fixedly arranged between the first rack 33 and the inner wall of the second slide groove 321, and the latch 34 is plug-fitted and connected with the guide assembly 4.

[0037] By adopting the above technical solution, the first gear 23 drives the second gear 31 to rotate, so that the first rack 33 slides along the first guide rail 32, and the latch 34 is plugged and matched with the guide assembly 4.

[0038] The guide assembly 4 includes four second guide rails 41, which are respectively fixed on the four inner walls of the base 1. Third slide grooves 411 are provided on both side surfaces of the second guide rails 41. A convex plate 43 is slidably installed in the third slide groove 411. Positioning holes 431 are provided on the inner walls of the convex plate 43 and the third slide groove 411. A second spring 44 is fixedly provided on the bottom surface of the third slide groove 411. The upper end of the second spring 44 is fitted and connected to the bottom surface of the convex plate 43. The latch pin 34 is movably inserted in the positioning hole 431. A connecting block 42 is fixedly provided on the upper surface of the convex plate 43. The upper surface of the connecting block 42 is fitted and connected to the bottom surface of the cover plate 2. The anti-fall frame 5 is fixedly connected to the connecting block 42.

[0039] By adopting the above technical solution, the anti-fall frame 5 is slidably installed inside the base 1 along the second guide rail 41 through the convex plate 43 at the bottom end of the connecting block 42. The convex plate 43 presses the second spring 44. When the cover plate 2 presses the connecting block 42 downward, the second spring 44 can be deformed to support the cover plate 2. The pin 34 is plug-in-fitted with the positioning hole 431, so that the anti-fall frame 5 can be stably installed inside the base 1.

[0040] The anti-fall frame 5 is rectangular in shape, and a plurality of leakage holes 51 are provided on the inner bottom surface of the anti-fall frame 5 . Four hanging chains 52 are fixedly provided on the upper surface of the anti-fall frame 5 , and the upper ends of the hanging chains 52 are fixedly connected to the connecting block 42 .

[0041] By adopting the above technical solution, the anti-fall frame 5 is fixedly connected to the connecting block 42 through four lifting chains 52, which is convenient for installation and disassembly. The cover plate 2 is supported by the four connecting blocks 42, so that the bearing capacity of the cover plate 2 is increased and the overall structure is more solid.

[0042] Working principle: the anti-fall frame 5 is fixedly connected to the connecting block 42 through four hanging chains 52, and is slidably installed inside the base 1 along the second guide rail 41 through the convex plate 43. When the cover plate 2 is rotated and closed along the base 1, the first gear 23 at the bottom end of the hydraulic support rod 22 drives the second gear 31 to rotate, so that the first rack 33 can slide along the first guide rail 32, squeeze the first spring 35, and make the latch 34 plug and match with the positioning hole 431, so as to limit the convex plate 43, and the cover plate 2 presses the connecting block 42 and deforms the second spring 44, so that the anti-fall frame 5 can be stably installed inside the base 1. In addition, when the cover plate 2 and the base 1 are closed, the limiting shafts 62 on both sides of the rectangular block 61 are clamped in the V-shaped groove 711, so that the chuck 71 can drive the third gear 73 to rotate through the rotating shaft 72, and make the second rack 81 and the cross plate 85 slide downward, and squeeze the first spring 35. The fourth spring 84 is pressed so that the rectangular slot 851 provided on the cross plate 85 can be connected to the third rectangular slot 125. Since the block 63 is provided with a beveled edge 631, the block 63 can slide into the third rectangular slot 125 and be snapped into the rectangular slot 851, thereby limiting the third gear 73 and locking the limiting shaft 62 in the V-shaped slot 711. When it is necessary to open the cover 2, the convex block 65 is pulled by the rectangular through groove 24 to disengage the blocking block 63 from the rectangular slot 851. Therefore, under the rebound force of the fourth spring 84, the second rack 81 moves upward and drives the third gear 73 and the chuck 71 to rotate, so that the limiting shaft 62 can disengage from the V-shaped slot 711. Then, the cover 2 is opened by the hydraulic support rod 22, and the latch pin 34 is disengaged from the positioning hole 431, so that the anti-fall frame 5 can be quickly taken out for cleaning.

[0043] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A hydraulic manhole cover, comprising a base (1), characterized in that: The bottom surface of the base (1) is fixedly connected to a bottom frame (13); a mounting groove (12) is provided on an inner wall of one side of the base (1); a clamping device (7) and a locking assembly (8) are installed in the mounting groove (12); the clamping device (7) and the locking assembly (8) are in driving connection; a cover plate (2) is rotatably connected to the base (1); a second limit device (6) is installed on the bottom surface of the cover plate (2); the second limit device (6) is respectively clamped and connected to the clamping device (7) and the locking assembly (8); a guide assembly (4) is installed on the inner wall of the base (1); the guide assembly (4) is connected to an anti-fall frame (5); the cover plate (2) is in driving connection with a first limit device (3); the first limit device (3) is clamped and connected to the guide assembly (4); The mounting groove (12) comprises a cross groove (121), first rectangular grooves (122) are provided on both sides of the cross groove (121), a third rectangular groove (125) is provided on the inner surface of the cross groove (121), a first sliding groove (124) is provided on the inner wall of the first rectangular groove (122), a second rectangular groove (123) is connected between the two first rectangular grooves (122), the inner wall of the cross groove (121) is rotatably connected to the clamping device (7), and the first sliding groove (124) is slidably connected to the locking component (8); The clamping device (7) comprises two chucks (71), the chucks (71) are provided with a plurality of V-shaped clamping grooves (711), the inner walls of the V-shaped clamping grooves (711) are arc-shaped, the V-shaped clamping grooves (711) are clamped and connected to the second limit device (6), the chucks (71) are fixedly provided with a rotating shaft (72), the rotating shaft (72) is rotatably connected to the inner wall of the cross groove (121), one end of the rotating shaft (72) is arranged in the first rectangular groove (122) and is fixedly connected to a third gear (73), and the third gear (73) is drivingly connected to the locking assembly (8); The locking assembly (8) comprises two second racks (81), the two second racks (81) are respectively meshed with a third gear (73), a convex slider (82) is fixedly provided on the inner surface of the second rack (81), the convex slider (82) is slidably arranged in the first slide groove (124), a fixing rod (83) is slidably connected in the convex slider (82), the fixing rod (83) is fixedly arranged on the inner wall of the first slide groove (124), and the outer surface of the fixing rod (83) is sleeved with a fourth spring (84), the fourth spring (84) being fixedly arranged between the convex sliding block (82) and the inner wall of the first sliding groove (124), a transverse plate (85) being fixedly arranged between the two second racks (81), the transverse plate (85) being slidably arranged in the second rectangular groove (123), a rectangular clamping groove (851) being provided on the surface of the transverse plate (85), the rectangular clamping groove (851) being communicated with the third rectangular groove (125), and the second limiting device (6) being clamped in the rectangular clamping groove (851); The second limiting device (6) comprises a rectangular block (61), the rectangular block (61) is fixedly arranged on the bottom surface of the cover plate (2), limiting shafts (62) are fixedly arranged on both side surfaces of the rectangular block (61), the limiting shafts (62) are clamped in the V-shaped clamping groove (711), a clamping block (63) is slidably connected in the rectangular block (61), one end surface of the clamping block (63) is provided with a bevel (631), the clamping block (63) is clamped in the rectangular clamping groove (851), the clamping block (63) is fixedly connected with a convex block (65), and two third springs (64) are fixedly arranged between the convex block (65) and the rectangular block (61); The cover plate (2) is provided with a rectangular through slot (24), the rectangular through slot (24) being arranged at the convex block (65), the bottom surfaces of both ends of the cover plate (2) being fixedly provided with rotating blocks (21), the rotating blocks (21) being rotatably connected with hydraulic support rods (22), the bottom ends of the hydraulic support rods (22) being rotatably arranged at the inner wall of the base (1), the bottom ends of the hydraulic support rods (22) being fixedly provided with a first gear (23), the first gear (23) being transmission-connected to the first limit device (3); The first limiting device (3) comprises two first guide rails (32), the two first guide rails (32) are respectively fixedly arranged at the inner walls on both sides of the base (1), the side of the first guide rail (32) is provided with a second slide groove (321), the second slide groove (321) is slidably connected with a first rack (33), the first rack (33) is meshedly connected with a second gear (31), the second gear (31) is rotatably connected to the inner wall of the base (1), the second gear (31) is meshedly connected with the first gear (23), one end of the first rack (33) is fixedly connected with a latch (34), the outer surface of the latch (34) is sleeved with a first spring (35), the first spring (35) is fixedly arranged between the first rack (33) and the inner wall of the second slide groove (321), and the latch (34) is plug-fittedly connected to the guide assembly (4); The guide assembly (4) comprises four second guide rails (41), the second guide rails (41) being fixedly arranged at four inner walls of the base (1), the second guide rails (41) being provided with third slide grooves (411) on both side surfaces, a convex plate (43) being slidably mounted in the third slide groove (411), the convex plate (43) and the inner wall of the third slide groove (411) being provided with positioning holes (431), a second spring (44) being fixedly arranged on the inner bottom surface of the third slide groove (411), the upper end of the second spring (44) being fitted and connected to the bottom surface of the convex plate (43), a plug pin (34) being movably inserted in the positioning hole (431), a connecting block (42) being fixedly arranged on the upper surface of the convex plate (43), the upper surface of the connecting block (42) being fitted and connected to the bottom surface of the cover plate (2), and the anti-fall frame (5) being fixedly connected to the connecting block (42).

2. The hydraulic manhole cover according to claim 1, characterized in that: Two hinge blocks (11) are fixedly provided on one side surface of the base (1), the hinge blocks (11) are rotatably connected to the cover plate (2), and a plurality of corner blocks (14) are fixedly provided between the outer surface of the base (1) and the upper surface of the bottom frame (13).

3. The hydraulic manhole cover according to claim 1, characterized in that: The anti-fall frame (5) is rectangular in shape, and a plurality of leakage holes (51) are provided on the inner bottom surface of the anti-fall frame (5). Four hanging chains (52) are fixedly provided on the upper surface of the anti-fall frame (5), and the upper ends of the hanging chains (52) are fixedly connected to the connecting blocks (42).

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