A safe and theft-proof well lid

Abstract

The utility model discloses a kind of well lid that can safely escape and prevent theft, relate to well lid technical field, including inner well lid, monitoring mechanism is installed on inner well lid, the end of this monitoring mechanism away from inner well lid is attached with outer well lid bottom;Locking inner well lid's lock rod mechanism is connected with transmission mechanism transmission, this transmission mechanism is connected with inner well lid cooperation;Transmission mechanism upper end is fixedly connected with handle;Monitoring mechanism includes universal switch, universal switch is connected with the end of spring cooperation, the end of spring away from universal switch is fixedly connected with eccentric ball;Eccentric ball is attached with the bottom of outer well lid;When outer well lid is moved away, spring resets and opens universal switch, universal switch generates signal transmission to controller, controller can control motor to drive rotating plate rotation, so that movable pin is far from card slot, let sleeve shaft body cannot drive rotating shaft cylinder rotation, to let sleeve shaft idle, so that handle cannot open inner well lid, play the purpose of theft prevention.

Description

Technical Field

[0001] This utility model relates to the field of manhole cover technology, specifically a manhole cover that enables safe escape and is theft-proof. Background Technology

[0002] Manhole covers are infrastructure components used to cover the openings of underground pipe networks in cities (such as drainage, gas, electricity, and communication wells). Their core functions are to ensure the safety of pedestrians and vehicles, protect underground facilities, and facilitate future maintenance.

[0003] Chinese Patent Publication No. CN 211113765 U discloses an anti-theft manhole cover, including an anti-theft ring, a manhole cover groove inside the anti-theft ring, a rotating groove at the bottom of the groove wall, two opposing embedding grooves above the rotating groove, an anti-theft groove above the embedding groove, an anti-theft mechanism in the anti-theft groove, and a manhole cover inside the manhole cover groove; the manhole cover is installed inside the anti-theft ring, and the embedding mechanisms at both ends of the manhole cover are inserted into the rotating groove to lock in conjunction with the anti-theft mechanism; a barrier plate is provided inside the anti-theft groove. The aforementioned anti-theft manhole covers use anti-theft rings to prevent theft. However, underground pipelines and other infrastructure require regular maintenance. Maintenance personnel need to enter the manhole through the opening at the manhole cover. However, once the manhole cover is closed, maintenance personnel cannot open it from the inside, increasing the danger to their work. Utility Model Content

[0004] The purpose of this utility model is to provide a manhole cover that enables safe escape and is theft-proof. The monitoring mechanism can monitor the manhole cover for theft prevention, and the transmission mechanism and locking rod mechanism work together to open the manhole cover from the inside or outside, thereby solving the technical problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A type of manhole cover that allows for safe escape and is theft-proof, including The inner manhole cover is located inside the manhole and is equipped with a monitoring mechanism. The end of the monitoring mechanism away from the inner manhole cover is attached to the bottom of the outer manhole cover. The locking mechanism is used to lock the inner manhole cover. The locking mechanism is connected to the transmission mechanism, which is connected to the inner manhole cover. The upper end of the transmission mechanism is fixedly connected to the handle. The inner manhole cover includes a cover body, and the monitoring mechanism includes a universal switch. The universal switch is connected to the end of a spring, and the end of the spring away from the universal switch is fixedly connected to an eccentric ball. The eccentric ball is in contact with the bottom of the outer manhole cover. The transmission mechanism includes a magnetic key, which is coaxially arranged with the sleeve shaft. The end of the sleeve shaft away from the magnetic key is movably connected to the driven shaft. A motor assembly is provided on one side of the driven shaft. A compression spring is sleeved on the end of the driven shaft away from the sleeve shaft. The end of the compression spring near the sleeve shaft is in contact with the turntable, and the end of the compression spring away from the turntable is in contact with a washer. Both the turntable and the washer are coaxially connected to the driven shaft. The locking rod mechanism includes an elastic connecting plate, one end of which is rotatably connected to the bottom of the turntable; the end of the elastic connecting plate away from the turntable is rotatably connected to the locking rod; the locking rod passes through the fixed cylinder and is movably connected to the fixed cylinder; a locking groove is provided at the position corresponding to the locking rod in the shaft.

[0006] As a further technical solution of this utility model, the motor assembly includes a motor, the output shaft of which is connected to a rotating plate; an N-pole magnet and an S-pole magnet are symmetrically embedded at the end of the rotating plate away from the motor; the driven shaft includes a shaft sleeve, which is coaxially and movably connected to a sleeve shaft, and a sleeve is integrally provided on one side of the shaft sleeve near the sleeve shaft, and a movable pin is coaxially provided on the inner side of the sleeve, and a magnetic block is embedded inside the movable pin.

[0007] As a further technical solution of this utility model, the magnetic key includes a shaft with symmetrical protrusions at the end of the shaft away from the handle; the sleeve includes a sleeve body with a groove inside for engaging with the protrusions; the sleeve body has a slot at the position corresponding to the movable pin; the position of the sleeve corresponds to the position of the rotating plate, and the end of the magnetic block near the rotating plate is the S pole; the diameter of the movable pin near the slot is smaller than the width of the slot.

[0008] As a further technical solution of this utility model, the motor assembly and the driven shaft are both located inside the inner lower cover and connected to it, and the inner lower cover has a space for the rotating plate to move normally; the top of the inner lower cover is fixedly connected to the inner upper cover; the inner lower cover and the inner upper cover are both located inside the outer lower cover and are fixedly connected to the outer lower cover; the top of the outer lower cover is fixedly connected to the outer upper cover, and a waterproof gasket is provided between the outer upper cover and the outer lower cover; the middle of the outer upper cover and the inner upper cover is provided with a round hole for the sleeve shaft to pass through.

[0009] As a further technical solution of this utility model, the three elastic connecting plates are all Z-shaped and distributed in a ring-shaped mixed pattern, and the three elastic connecting plates are the same in shape and size; the fixing cylinder is rectangular, and the top of the fixing cylinder is fixedly connected to the bottom of the cover by bolts; a sleeve is fitted to the bottom of the fixing cylinder.

[0010] Compared with the prior art, the beneficial effects of this utility model are: 1. In this utility model, after the outer manhole cover is placed, the outer manhole cover presses down on the eccentric ball, causing the spring to bend. The bent spring drives the universal switch to be in a closed state. When the outer manhole cover is removed, the spring returns to its original position and opens the universal switch. The universal switch generates a signal and transmits it to the controller. The controller can control the motor to drive the rotating plate to rotate, causing the N-pole magnet of the rotating plate to approach the magnetic block. Under the principle of opposite poles attracting, the magnetic block drives the movable pin to move towards the rotating plate, causing the movable pin to move away from the slot. This prevents the sleeve shaft body from driving the rotating cylinder to rotate, thus allowing the sleeve shaft to spin freely. This also prevents the inner manhole cover from being opened using the handle, achieving the purpose of anti-theft.

[0011] 2. In normal use, the S-pole magnet block causes the movable pin to insert into the slot. The operator rotates the handle to drive the shaft to rotate, which in turn drives the turntable to rotate. When the turntable rotates, the elastic connecting plate pushes the locking rod to move inside the fixed cylinder, thereby causing the locking rod to disengage from or enter the locking groove on the well, thus enabling the inner well cover to be opened or closed from the outside using the handle.

[0012] 3. In this utility model, when maintenance personnel enter the well shaft and the inner well cover is locked, the maintenance personnel can lower the turntable by holding it and pulling it downwards. When the turntable lowers, the compression spring is compressed, and the transmission groove in the middle of the turntable cannot engage with the rotating shaft cylinder. The maintenance personnel can drive the turntable to rotate, thereby moving the locking rod to unlock the inner well cover. Moreover, the turntable will not drive the sleeve shaft body, shaft rod and handle to rotate when rotating, which reduces the difficulty of operation, ensures the safety of maintenance personnel in the well shaft, and avoids safety accidents caused by the inability to unlock the well cover. Attached Figure Description

[0013] Figure 1 This is an installation diagram of this utility model.

[0014] Figure 2 This is a three-dimensional structural diagram of the present invention.

[0015] Figure 3 This utility model Figure 2 Another perspective view.

[0016] Figure 4 This is a three-dimensional structural diagram of the inner manhole cover of this utility model.

[0017] Figure 5 This utility model Figure 4 Another perspective view.

[0018] Figure 6 This is a three-dimensional structural diagram of the monitoring mechanism of this utility model.

[0019] Figure 7 This utility model Figure 2A partial structural diagram.

[0020] Figure 8 This utility model Figure 7 Another perspective view.

[0021] Figure 9 This utility model Figure 7 A partial structural diagram.

[0022] Figure 10 This utility model Figure 9 Side view.

[0023] Figure 11 This utility model Figure 10 AA sectional view.

[0024] Figure 12 This utility model Figure 9 A partial structural diagram.

[0025] Figure 13 This utility model Figure 12 A schematic diagram of the substructure.

[0026] Figure 14 This is a three-dimensional structural diagram of the magnetic key of this utility model.

[0027] Figure 15 This is a three-dimensional structural diagram of the sleeve shaft of this utility model.

[0028] Figure 16 This is a three-dimensional structural diagram of the driven rotating shaft of this utility model.

[0029] Figure 17 This utility model Figure 16 The main view.

[0030] Figure 18 This utility model Figure 17 AA sectional view.

[0031] In the diagram: 1-Inner manhole cover, 2-Monitoring mechanism, 3-Transmission mechanism, 4-Locking rod mechanism, 5-Handle, 6-Outer manhole cover; 11-Cover body, 12-Mounting sleeve, 13-Limiting block, 14-Snap groove, 15-Through hole, 16-Clamping component, 21-Eccentric ball, 22-Spring, 23-Universal switch, 31-Outer lower cover, 32-Outer upper cover, 33-Magnetic key, 34-Sleeve shaft, 35-Driven rotating shaft, 36-Turntable, 37-Washer, 38-Compression spring, 39-Waterproof washer, 30-Motor assembly, 310-Inner lower cover, 311-Inner upper cover, 41-Elastic connecting plate, 42-Locking rod, 43-Fixing cylinder, 44-Casing box; 301-Motor, 302-Rotating plate, 303-N pole magnet, 304-S pole magnet, 331-Shaft, 332-Protrusion, 341-Sleeve body, 342-Groove, 343-Slot, 351-Rotating cylinder, 352-Sleeve, 353-Modible pin, 354-Magnetic block. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] Please see Figure 1-18 In this embodiment of the utility model, a manhole cover that enables safe escape and is theft-proof includes... The inner manhole cover 1 is located inside the manhole and is equipped with a monitoring mechanism 2. The end of the monitoring mechanism 2 away from the inner manhole cover 1 is attached to the bottom of the outer manhole cover 6. The locking mechanism 4 is used to lock the inner manhole cover 1. The locking mechanism 4 is connected to the transmission mechanism 3, which is connected to the inner manhole cover 1. The upper end of the transmission mechanism 3 is fixedly connected to the handle 5. The inner manhole cover 1 includes a cover body 11, and the monitoring mechanism 2 includes a universal switch 23. The universal switch 23 is connected to the end of a spring 22. The end of the spring 22 away from the universal switch 23 is fixedly connected to an eccentric ball 21. The eccentric ball 21 is attached to the bottom of the outer manhole cover 6. The transmission mechanism 3 includes a magnetic key 33, which is coaxially arranged with a sleeve shaft 34. The end of the sleeve shaft 34 away from the magnetic key 33 is movably connected to a driven rotating shaft 35. A motor assembly 30 is provided on one side of the driven rotating shaft 35. A compression spring 38 is sleeved on the end of the driven rotating shaft 35 away from the sleeve shaft 34. The end of the compression spring 38 near the sleeve shaft 34 is in contact with a turntable 36, and the end of the compression spring 38 away from the turntable 36 is in contact with a washer 37. Both the turntable 36 and the washer 37 are coaxially connected to the driven rotating shaft 35. The locking rod mechanism 4 includes an elastic connecting plate 41, one end of which is rotatably connected to the bottom of the turntable 36; the end of the elastic connecting plate 41 away from the turntable 36 is rotatably connected to the locking rod 42; the locking rod 42 passes through the fixed cylinder 43 and is movably connected to the fixed cylinder 43; a locking groove is provided at the position corresponding to the locking rod 42 in the shaft. The motor assembly 30 includes a motor 301, the output shaft of which is connected to a rotating plate 302; an N-pole magnet 303 and an S-pole magnet 304 are symmetrically embedded at the end of the rotating plate 302 away from the motor 301; the driven shaft 35 includes a shaft cylinder 351, which is coaxially and movably connected to a sleeve shaft 34, and a sleeve 352 is integrally provided on one side of the shaft cylinder 351 near the sleeve shaft 34; a movable pin 353 is coaxially provided on the inner side of the sleeve 352, and a magnetic block 354 is embedded inside the movable pin 353.

[0034] By adopting the above technical solution, after the outer manhole cover 6 is covered, the outer manhole cover 6 presses down on the eccentric ball 21, causing the spring 22 to bend. The bent spring 22 drives the universal switch 23 to be in a closed state. When the outer manhole cover 6 is removed, the spring 22 returns to its original position and opens the universal switch 23. The universal switch 23 generates a signal and transmits it to the controller. The controller can control the motor 301 to drive the rotating plate 302 to rotate, so that the N pole magnet 303 of the rotating plate 302 approaches the magnetic block 354. Under the principle of opposite poles attracting each other, the magnetic block 354 drives the movable pin 353 to move towards the rotating plate 302, so that the movable pin 353 moves away from the slot 343, so that the sleeve shaft body 341 cannot drive the rotating shaft cylinder 351 to rotate, thus allowing the sleeve shaft 34 to rotate freely. This makes it impossible to open the inner manhole cover 1 using the handle 5, achieving the purpose of anti-theft.

[0035] In this embodiment, the magnetic key 33 includes a shaft 331, with symmetrical protrusions 332 at the end of the shaft 331 away from the handle 5; the sleeve 34 includes a sleeve body 341, with a groove 342 inside the sleeve body 341 for engaging with the protrusions 332; the sleeve body 341 has a slot 343 at the position corresponding to the movable pin 353; the position of the sleeve 352 corresponds to the position of the rotating plate 302, and the end of the magnetic block 354 near the rotating plate 302 is the S pole; the diameter of the movable pin 353 near the slot is smaller than the width of the slot 343; The motor assembly 30 and the driven shaft 35 are both located inside the inner lower cover 310 and are connected to the inner lower cover 310 at the end closest to the motor assembly 30. The inner lower cover 310 has a space for the rotating plate 302 to move normally. The top of the inner lower cover 310 is fixedly connected to the inner upper cover 311. The inner lower cover 310 and the inner upper cover 311 are both located inside the outer lower cover 31 and are fixedly connected to the outer lower cover 31. The top of the outer lower cover 31 is fixedly connected to the outer upper cover 32. A waterproof gasket 39 is provided between the outer upper cover 32 and the outer lower cover 31. The outer upper cover 32 and the inner upper cover 311 are both provided with a round hole for the sleeve shaft 34 to pass through.

[0036] By adopting the above technical solution, under normal use, the S-pole magnet 304 magnetic block 354 causes the movable pin 353 to be inserted into the slot 343. The operator rotates the handle 5 to drive the shaft 331 to rotate, thereby driving the turntable 36 to rotate. When the turntable 36 rotates, the elastic connecting plate 41 pushes the locking rod 42 to move inside the fixed cylinder 43, thereby causing the locking rod 42 to disengage from or enter the locking groove on the well passage, realizing the opening or closing of the inner well cover 1 from the outside using the handle 5. In addition, the magnetic key 33 is carried by the operator. When the magnetic key 33 needs to be used, the operator can manually insert the magnetic key 33 into the sleeve shaft body 341.

[0037] In this embodiment, the turntable 36 is uniformly provided with a plurality of arc-shaped through slots that are convenient for workers to hold. The turntable 36 has a transmission slot in the middle for the rotating shaft cylinder 351 to pass through, and the shape of the connection between the rotating shaft cylinder 351 and the turntable 36 is the same as the shape of the transmission slot. The position of the rotating shaft cylinder 351 corresponding to the compression spring 38 is circular and its size is smaller than the size of the transmission slot of the turntable 36. The inner diameter of the compression spring 38 is larger than the width of the transmission slot of the turntable 36. The top of the cover 11 is integrally provided with a mounting sleeve 12 at the position corresponding to the spring 22, and both the mounting sleeve 12 and the cover 11 have a round hole for the spring 22 to pass through; the bottom of the cover 11 is fixedly connected with a clamping member 16 at the position corresponding to the mounting sleeve 12, and the universal switch 23 is located inside the clamping member 16 and fixedly connected to the clamping member 16; the middle of the cover 11 has a through hole 15 for the magnetic key 33 to pass through, and two limiting blocks 13 for limiting the handle 5 are symmetrically provided on the side of the through hole 15 away from the mounting sleeve 12, and both limiting blocks 13 are fixedly connected to the top of the cover 11; both sides of the top of the cover 11 have a buckle groove 14. All three elastic connecting plates 41 are Z-shaped and distributed in a circular mixed pattern, and the three elastic connecting plates 41 are the same in shape and size; the fixing cylinder 43 is rectangular, and the top of the fixing cylinder 43 is fixedly connected to the bottom of the cover 11 by bolts; a sleeve 44 is fitted onto the bottom of the fixing cylinder 43.

[0038] By adopting the above technical solution, when maintenance personnel enter the well and the inner well cover 1 is locked, the maintenance personnel can lower the turntable 36 by holding it and pulling it down. When the turntable 36 lowers, the compression spring 38 is compressed. At this time, the transmission groove in the middle of the turntable 36 cannot engage with the rotating shaft cylinder 351. The maintenance personnel can drive the turntable 36 to rotate, thereby driving the locking rod 42 to move and unlock the inner well cover 1. When the turntable 36 rotates, it will not drive the sleeve shaft body 341, shaft 331 and handle 5 to rotate, which reduces the difficulty of operation, ensures the safety of maintenance personnel in the well, and avoids safety accidents caused by the inability to unlock the well cover.

[0039] The working principle of this utility model is as follows: After the outer manhole cover 6 is covered, the outer manhole cover 6 presses down on the eccentric ball 21, causing the spring 22 to bend. The bent spring 22 drives the universal switch 23 to be in a closed state. When the outer manhole cover 6 is removed, the spring 22 returns to its original position and opens the universal switch 23. The universal switch 23 generates a signal and transmits it to the controller. The controller can control the motor 301 to drive the rotating plate 302 to rotate, so that the N pole magnet 303 of the rotating plate 302 approaches the magnetic block 354. Under the principle of opposite poles attracting each other, the magnetic block 354 drives the movable pin 353 to move towards the rotating plate 302, so that the movable pin 353 moves away from the slot 343, so that the sleeve shaft body 341 cannot drive the rotating shaft cylinder 351 to rotate, thus allowing the sleeve shaft 34 to rotate freely. This makes it impossible to open the inner manhole cover 1 using the handle 5, achieving the purpose of anti-theft. Under normal use, the S-pole magnet 304 and magnetic block 354 cause the movable pin 353 to be inserted into the slot 343. The operator rotates the handle 5 to drive the shaft 331 to rotate, thereby driving the turntable 36 to rotate. When the turntable 36 rotates, the elastic connecting plate 41 pushes the locking rod 42 to move inside the fixed cylinder 43, thereby causing the locking rod 42 to disengage from the locking groove on the well or enter the locking groove, so as to open or close the inner well cover 1 from the outside using the handle 5. When maintenance personnel enter the well shaft and the inner well cover 1 is locked, they can lower the turntable 36 by holding it and pulling it down. As the turntable 36 descends, the spring 38 is compressed, preventing the transmission groove in the middle of the turntable 36 from engaging with the rotating shaft cylinder 351. This allows the maintenance personnel to rotate the turntable 36, thereby moving the locking rod 42 to unlock the inner well cover 1. Furthermore, the turntable 36 does not rotate the sleeve shaft body 341, shaft 331, or handle 5, reducing the difficulty of operation, ensuring the safety of maintenance personnel in the well shaft, and preventing accidents caused by the inability to unlock the well cover.

[0040] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A manhole cover that enables safe escape and is theft-proof, characterized in that: include The inner manhole cover (1) is located inside the manhole and is equipped with a monitoring mechanism (2). The end of the monitoring mechanism (2) away from the inner manhole cover (1) is attached to the bottom of the outer manhole cover (6). The locking rod mechanism (4) is used to lock the inner manhole cover (1). The locking rod mechanism (4) is connected to the transmission mechanism (3). The transmission mechanism (3) is connected to the inner manhole cover (1). The upper end of the transmission mechanism (3) is fixedly connected to the handle (5). The inner manhole cover (1) includes a cover body (11), and the monitoring mechanism (2) includes a universal switch (23). The universal switch (23) is connected to the end of a spring (22), and the end of the spring (22) away from the universal switch (23) is fixedly connected to an eccentric ball (21). The eccentric ball (21) is attached to the bottom of the outer manhole cover (6). The transmission mechanism (3) includes a magnetic key (33), which is coaxially arranged with the sleeve shaft (34). The end of the sleeve shaft (34) away from the magnetic key (33) is movably connected to the driven shaft (35). A motor assembly (30) is provided on one side of the driven shaft (35). A compression spring (38) is sleeved on the end of the driven shaft (35) away from the sleeve shaft (34). The end of the compression spring (38) near the sleeve shaft (34) is in contact with the turntable (36), and the end of the compression spring (38) away from the turntable (36) is in contact with the gasket (37). The turntable (36) and the gasket (37) are both coaxially connected with the driven shaft (35). The locking rod mechanism (4) includes an elastic connecting plate (41), one end of which is rotatably connected to the bottom of the turntable (36); the end of the elastic connecting plate (41) away from the turntable (36) is rotatably connected to the locking rod (42); the locking rod (42) passes through the fixed cylinder (43) and is movably connected to the fixed cylinder (43); a locking groove is provided at the position corresponding to the locking rod (42) in the well passage.

2. The manhole cover that enables safe escape and is theft-proof, as described in claim 1, is characterized in that: The motor assembly (30) includes a motor (301), the output shaft of which is connected to a rotating plate (302); an N-pole magnet (303) and an S-pole magnet (304) are symmetrically embedded at the end of the rotating plate (302) away from the motor (301); the driven shaft (35) includes a shaft sleeve (351), which is coaxially connected to the sleeve shaft (34), and a sleeve (352) is integrally provided on one side of the shaft sleeve (351) near the sleeve shaft (34). A movable pin (353) is coaxially provided on the inner side of the sleeve (352), and a magnetic block (354) is embedded inside the movable pin (353).

3. The manhole cover that enables safe escape and is theft-proof, as described in claim 2, is characterized in that: The magnetic key (33) includes a shaft (331), and a protrusion (332) is symmetrically provided at the end of the shaft (331) away from the handle (5); the sleeve (34) includes a sleeve body (341), and the sleeve body (341) has a groove (342) inside for engaging with the protrusion (332); the sleeve body (341) has a slot (343) at the position corresponding to the movable pin (353); the position of the sleeve (352) corresponds to the position of the rotating plate (302), and the end of the magnetic block (354) near the rotating plate (302) is the S pole; the diameter of the movable pin (353) near the slot is smaller than the width of the slot (343).

4. The manhole cover that enables safe escape and is theft-proof, as described in claim 1, is characterized in that: The motor assembly (30) and the driven shaft (35) are located inside the inner lower cover (310) and are connected to the inner lower cover (310) at the end closest to the motor assembly (30). The inner lower cover (310) has a space for the rotating plate (302) to move normally. The top of the inner lower cover (310) is fixedly connected to the inner upper cover (311). The inner lower cover (310) and the inner upper cover (311) are both located inside the outer lower cover (31), and the inner lower cover (310) is fixedly connected to the outer lower cover (31). The top of the outer lower cover (31) is fixedly connected to the outer upper cover (32), and a waterproof gasket (39) is provided between the outer upper cover (32) and the outer lower cover (31). The outer upper cover (32) and the inner upper cover (311) are both provided with a round hole for the sleeve shaft (34) to pass through.

5. The manhole cover that enables safe escape and is theft-proof, as described in claim 1, is characterized in that: The turntable (36) is evenly provided with multiple arc-shaped through slots that are convenient for workers to hold. The turntable (36) has a transmission slot in the middle for the rotating shaft cylinder (351) to pass through. The shape of the connection between the rotating shaft cylinder (351) and the turntable (36) is the same as the shape of the transmission slot. The position of the rotating shaft cylinder (351) and the compression spring (38) is circular and the size is smaller than the size of the transmission slot of the turntable (36). The inner diameter of the compression spring (38) is larger than the width of the transmission slot of the turntable (36).

6. The manhole cover that enables safe escape and is theft-proof, as described in claim 1, is characterized in that: The top of the cover (11) is integrally provided with a mounting sleeve (12) at the position corresponding to the spring (22), and the mounting sleeve (12) and the cover (11) are both provided with a round hole for the spring (22) to pass through; the bottom of the cover (11) is fixedly connected with a clamping member (16) at the position corresponding to the mounting sleeve (12), and the universal switch (23) is located inside the clamping member (16) and fixedly connected to the clamping member (16); the middle of the cover (11) is provided with a through hole (15) for the magnetic key (33) to pass through, and two limiting blocks (13) for limiting the handle (5) are symmetrically provided on the side of the through hole (15) away from the mounting sleeve (12), and both limiting blocks (13) are fixedly connected to the top of the cover (11); the top two sides of the cover (11) are provided with buckle grooves (14).

7. The manhole cover that enables safe escape and is theft-proof, as described in claim 1, is characterized in that: The three elastic connecting plates (41) are all Z-shaped and distributed in a ring-shaped mixed pattern, and the three elastic connecting plates (41) are the same in shape and size; the fixed cylinder (43) is rectangular, and the top of the fixed cylinder (43) is fixedly connected to the bottom of the cover (11) by bolts; the bottom of the fixed cylinder (43) is fitted with a sleeve box (44).

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