A warning device for preventing the risk of falling after a manhole cover is opened

Abstract

The present application discloses a danger warning device for preventing falling after a manhole cover is opened, which relates to the technical field of manhole cover warning, and improves the problem that it is easy to have a well-falling accident without any warning signs after the manhole cover is opened. It includes a base, a warning sign fixing frame, a warning sign mechanism and a storage spring. The base is connected to the inner side of the manhole cover seat. A first installation groove is formed in the base, and the first installation groove penetrates through one end of the base to form an opening. The warning sign fixing frame is arranged in the first installation groove. The warning sign mechanism is arranged on the warning sign fixing frame. One end of the storage spring is connected to the bottom of the first installation groove of the base, and the other end of the storage spring is connected to the bottom of the warning sign fixing frame. The top of the warning sign fixing frame abuts against the bottom of the manhole cover, and the manhole cover presses down to drive the warning sign fixing frame to compress the storage spring. The present application can pop up a warning sign ball for warning after the manhole cover is opened in a non-maintenance state, reducing the potential safety hazard of falling into the well.

Description

Technical Field

[0001] This application relates to the technical field of manhole cover warning, and in particular to a warning device for preventing falling hazards after the manhole cover is opened. Background Art

[0002] Manhole covers are usually used to cover road deep wells to prevent pedestrians or objects from falling when passing over the deep wells, protecting the safety of pedestrians.

[0003] Existing manhole covers do not have any signs that can give warnings after being opened. In extreme weather conditions (typhoons, heavy rains), road waterlogging can easily cause manhole covers to be pushed open by the water in the drainage pipes flowing back. Manhole covers are everywhere on urban roads, and it is impossible to detect and repair them in time. Without any warning signs, accidents such as falling into wells are likely to occur, bringing great potential safety hazards to people's lives and property. Summary of the Invention

[0004] In order to improve the problem that it is easy to have accidents of falling into wells due to the lack of any warning signs after the manhole cover is opened, this application provides a warning device for preventing falling hazards after the manhole cover is opened.

[0005] This application provides a warning device for preventing falling hazards after the manhole cover is opened, adopting the following technical solutions:

[0006] A warning device for preventing falling hazards after the manhole cover is opened, comprising:

[0007] A base, the base is connected to the inner side of the manhole cover seat, and a first installation groove is opened on the base, and one end of the first installation groove penetrates through the base to form an opening;

[0008] A warning sign fixing frame, the warning sign fixing frame is arranged in the first installation groove;

[0009] A warning sign mechanism, the warning sign mechanism is arranged on the warning sign fixing frame;

[0010] An energy storage spring, one end of the energy storage spring is connected to the bottom of the first installation groove of the base, and the other end of the energy storage spring is connected to the bottom of the warning sign fixing frame;

[0011] Wherein, the top of the warning sign fixing frame abuts against the bottom of the manhole cover, and the manhole cover is pressed down to drive the warning sign fixing frame to compress the energy storage spring.

[0012] By adopting the above technical solutions, when the manhole cover is opened non - for - maintenance, the energy storage spring can pop out the warning sign fixing frame, and after the warning sign mechanism pops out with the warning sign fixing frame, it can play a warning role for pedestrians, effectively reducing the potential safety hazard of pedestrians falling into the well.

[0013] Optionally, the warning sign mechanism includes:

[0014] Warning sign ball, the warning sign ball is arranged on a warning sign fixing bracket;

[0015] Micro-pressure gas cylinder, the micro-pressure gas cylinder is connected to the warning sign fixing bracket, and the micro-pressure gas cylinder is connected to the warning sign ball;

[0016] Trigger assembly;

[0017] Wherein, after the warning sign fixing bracket leaves the base, the trigger assembly controls the micro-pressure gas cylinder to inflate the warning sign ball.

[0018] By adopting the above technical solution, the cooperation between the warning sign ball and the micro-pressure gas cylinder can make the warning of the warning sign mechanism more eye-catching for pedestrians, enhance the warning effect of the warning sign mechanism, and further ensure the safety of pedestrians.

[0019] Optionally, the trigger assembly includes:

[0020] Rope-pulling inflator, the rope-pulling inflator is simultaneously connected to the warning sign ball, the micro-pressure gas cylinder and the warning sign fixing bracket;

[0021] First cable, one end of the first cable is connected to the rope-pulling inflator, and the other end of the first cable is connected to the base;

[0022] Wherein, a plurality of first connection points for connecting the first cable are arranged on the base.

[0023] By adopting the above technical solution, the trigger assembly can control the micro-pressure gas cylinder to inflate the warning sign ball without using electronic components or mechanical structures, and the trigger assembly triggers quickly, which is convenient for the installation and reuse of the trigger assembly, and can effectively avoid the situation that water enters the first installation groove and causes the electronic components or mechanical structures of the trigger assembly to malfunction.

[0024] Optionally, a second cable is further connected to the warning sign ball, and the end of the second cable far away from the warning sign ball is connected to the first connection point.

[0025] By adopting the above technical solution, after the warning sign ball pops up and inflates, it can stay near the manhole cover, avoiding the warning sign ball being washed away by water and making the warning effect of the warning sign ball more accurate.

[0026] Optionally, a self-locking part is arranged on the warning sign fixing bracket, a self-locking mechanism is arranged on the base, a second installation groove for installing the self-locking mechanism is opened on the base, the self-locking mechanism includes a self-locking part for cooperating with the self-locking part and a self-locking spring for driving the self-locking part to move towards the self-locking part, one end of the self-locking spring is connected to the self-locking part, and the other end of the self-locking spring is connected to the groove wall of the second installation groove of the base.

[0027] By adopting the above technical solution, when the staff needs to open the manhole cover for inspection, the self-locking mechanism and the self-locking part can cooperate to prevent the warning sign fixing frame from popping out, effectively avoiding the warning device from being accidentally triggered during the inspection process.

[0028] Optionally, the base is further provided with an unlocking member for releasing the self-locking between the self-locking member and the self-locking portion, and the base is provided with a penetration hole for the unlocking member to pass through, one end of the penetration hole is communicated with the second mounting groove, and the other end of the penetration hole passes through the base in the direction close to the manhole cover, one end of the unlocking member is located in the second mounting groove, and the manhole cover is provided with a clearance hole for the unlocking member to pass through one end away from the self-locking mechanism, and the clearance hole passes through the manhole cover and is communicated with the penetration hole.

[0029] By adopting the above technical solution, the self-locking or unlocking between the self-locking mechanism and the self-locking part can be controlled by the unlocking member, which makes it convenient for the staff to operate the self-locking mechanism without opening the manhole cover.

[0030] Optionally, the base is further provided with a signal transmitter for transmitting the position information of the opened manhole cover back to the management center, and the base is provided with a third installation slot for installing the signal transmitter.

[0031] By adopting the above technical solution, when the manhole cover is opened for non-maintenance purposes, the management center can quickly know the location of the manhole cover, making it convenient for staff to go to the site for processing.

[0032] Optionally, the base is provided with a guide rod in the first installation groove for guiding the pop-up direction of the warning sign fixing frame, and the warning sign fixing frame is provided with a guide groove adapted to the guide rod.

[0033] By adopting the above technical solution, the reliability of the warning sign fixing frame popping out can be improved, and the probability that the warning sign fixing frame contacts the inner side of the base during the popping-out process and fails to pop out can be reduced.

[0034] In summary, this application has at least one of the following beneficial effects:

[0035] 1. When the manhole cover is opened for non-maintenance purposes, the warning sign fixing frame can carry the warning sign mechanism to pop out and serve as a warning to pedestrians;

[0036] 2. The warning sign ball takes up less space when not inflated, and has a better warning effect when fully inflated;

[0037] 3. The triggering component adopts non-electrical and non-mechanical methods to improve the reliability of the triggering component after the base is flooded;

[0038] 4. The warning ball can stay in the vicinity of the manhole cover, improving the reliability of the warning ball;

[0039] 5. The management center can learn the location of the opened manhole cover that is not under maintenance in a timely manner, which speeds up the processing speed of the staff for the opened manhole cover.

[0040] 6. The staff can operate the self-locking mechanism without opening the manhole cover, which is convenient for the staff to open the manhole cover for maintenance without triggering the warning device.

[0041] 7. The warning device can be reused multiple times, and the warning device is easy to install. Description of the Drawings

[0042] Figure 1 is a cross-sectional view of the self-locking mechanism in the unlocked state in the embodiment of the present application;

[0043] Figure 2 is Figure 1 the enlarged view of part A in

[0044] Figure 3 is a cross-sectional view of the self-locking mechanism in the self-locked state in the embodiment of the present application;

[0045] Figure 4 is Figure 3 the enlarged view of part B in

[0046] Description of the Reference Numerals: 1, base; 11, first installation groove; 12, guide rod; 13, third installation groove; 14, second installation groove; 15, first connection point; 16, second connection point; 17, waterproof layer; 171, protruding hole; 18, through hole; 19, fourth installation groove; 2, warning label fixing frame; 21, winding rod; 22, limiting member; 221, self-locking portion; 23, abutting member; 24, guide groove; 3, warning labeling mechanism; 31, warning labeling ball; 311, second cable; 32, micro-pressure gas cylinder; 33, triggering assembly; 331, first cable; 332, pull rope type inflator; 4, energy storage spring; 5, signal transmitter; 51, third cable; 6, self-locking mechanism; 61, self-locking member; 611, limiting portion; 62, self-locking spring; 7, manhole cover seat; 8, manhole cover; 81, relief hole; 9, unlocking member; 91, operating portion; 92, through portion; 93, unlocking portion. Detailed Description of the Embodiment

[0047] The following Figures 1-4 further describes the present application in detail with reference to the attached

[0048] The embodiment of the present application discloses a warning device for preventing the danger of falling after the manhole cover is opened.

[0049] Referring to Figure 1 and Figure 2, the warning device is connected to the inner side of the well cover seat 7. The warning device includes a warning label mechanism 3 for warning of danger, a warning label fixing frame 2 for carrying the warning label mechanism 3, a storage spring 4 for ejecting the warning label fixing frame 2, and a base 1 for installing the above components. The warning label mechanism 3 is arranged on the warning label fixing frame 2. The storage spring 4 is arranged on the side of the warning label fixing frame 2 away from the well cover 8. When the well cover 8 is installed on the well cover seat 7, it presses down on the warning label fixing frame 2, so that the storage spring 4 is compressed to store elastic potential energy. When the well cover 8 is opened in a non-maintenance state, the storage spring 4 drives the warning label fixing frame 2 to pop out of the well cover seat 7. After the warning label mechanism 3 pops out with the warning label fixing frame 2, it warns pedestrians, effectively reducing the safety hazard of pedestrians falling into the well.

[0050] A first installation groove 11 for installing the warning label fixing frame 2, the warning label mechanism 3, and the storage spring 4 is opened inside the base 1. The first installation groove 11 penetrates the base 1 in the direction close to the well cover 8 to form an opening for the warning label fixing frame 2 to pop out.

[0051] The base 1 is detachably connected to the inner side of the well cover seat 7. In this embodiment, it is preferably a threaded connection between the base 1 and the well cover seat 7. A plurality of second connection points 16 for the threaded connection between the base 1 and the well cover seat are opened on the base 1. In other embodiments, the connection method between the base 1 and the inner side of the well cover seat 7 can also adopt various detachable connection forms such as plugging and clamping.

[0052] Refer to Figure 1 , the warning label mechanism includes a warning label ball 31 for warning, a micro-pressure gas cylinder 32 for providing filling gas for the warning label ball 31, and a trigger assembly 33 for controlling the inflation of the micro-pressure gas cylinder 32 into the warning label ball 31 when the well cover 8 is opened in a non-maintenance state. The trigger assembly 33 is arranged on the warning label fixing frame 2. The micro-pressure gas cylinder 32 is connected to the trigger assembly 33, and the micro-pressure gas cylinder 32 is generally connected to the warning label fixing frame 2 through the trigger assembly 33.

[0053] The air inlet of the warning label ball 31 is connected to the trigger assembly 33. When the warning label ball 31 is not inflated, it is wound and stacked on the warning label fixing frame 2. To prevent the trigger assembly 33 and the micro-pressure gas cylinder 32 from interfering with the position of the warning label ball 31 during the inflation and expansion of the warning label ball 31, both the trigger assembly 33 and the micro-pressure gas cylinder 32 are located on the side close to the warning label fixing frame 2, and the warning label ball 31 wraps the trigger assembly 33 and the micro-pressure gas cylinder 32 while being wound and stacked on the warning label fixing frame 2.

[0054] The warning sign fixing bracket 2 is provided with a winding rod 21 around which the warning sign balls 31 are wound and stacked. The triggering assembly 33 and the micro-pressure gas cylinder 32 are both located on one side of the winding rod 21. Limit members 22 facilitating the winding of the warning sign balls 31 are provided at both ends in the length direction of the winding rod 21. The limit members 22 are adapted to the first installation groove 11. After the warning sign balls 31 are wound, they are located in the space between the two limit members 22.

[0055] Refer to Figure 1 and Figure 3 , in the first installation groove 11 of the base 1, a guide rod 12 for guiding the ejection direction of the warning sign fixing bracket 2 is further provided. One end of the guide rod 12 is connected to the bottom of the first installation groove 11, and the other end of the guide rod 12 penetrates into the warning sign fixing bracket 2. A guide groove 24 adapted to the guide rod 12 is provided at one end of the warning sign fixing bracket 2 close to the energy storage spring 4. One end of the energy storage spring 4 is connected to the bottom of the first installation groove 11, and the other end of the energy storage spring 4 abuts against the limit member 22 at one end of the warning sign fixing bracket 2 close to the energy storage spring 4. The energy storage spring 4 is sleeved on the guide rod 12. A contact member 23 for abutting against the bottom of the manhole cover 8 is provided at the end of the warning sign fixing bracket 2 far from the energy storage spring 4. When the manhole cover 8 is installed and pressed down, the energy storage spring 4 is compressed to store elastic potential energy. When the manhole cover 8 is opened for non-maintenance, the energy storage spring 4 ejects the warning sign fixing bracket 2, and the warning sign fixing bracket 2 can move upward along the guide rod 12 and leave the first installation groove 11.

[0056] The triggering assembly 33 includes a pull-cord inflator 332 and a first cable 331 for controlling the opening and closing of the pull-cord inflator 332. The pull-cord inflator 332 is connected to the limit member 22 at the end far from the energy storage spring 4, and the pull-cord inflator 332 is located between the two limit members 22. One end of the first cable 331 is connected to the pull-cord inflator 332, and a first connection point 15 for connecting the other end of the first cable 331 far from the pull-cord inflator 332 is further provided on the base 1. When the energy storage spring 4 ejects the warning sign fixing bracket 2, the first cable 331 pulls the switch of the pull-cord inflator 332, and then the pull-cord inflator 332 controls the micro-pressure gas cylinder 32 to inflate the warning sign balls 31 to make the warning sign balls 31 expand.

[0057] Refer to Figure 1 , a second cable 311 for preventing the warning sign balls 31 from being washed away from the periphery of the manhole cover 8 is further connected to the warning sign balls 31. One end of the second cable 311 is connected to the warning sign balls 31, and the other end of the second cable 311 is connected to the first connection point 15. After the warning sign fixing bracket 2 is ejected and the warning sign balls 31 are inflated and expanded, they will be separated from the warning sign fixing bracket 2, and the second cable 311 will hold the warning sign balls 31 to make the warning sign balls 31 located around the opened manhole cover 8.

[0058] On one side of the warning sign fixing frame 2, the base 1 is provided with a signal transmitter 5 for transmitting the mis-opening alarm of the non-maintenance opened manhole cover 8 and the position information of the non-maintenance opened manhole cover 8 to the management center. A third installation groove 13 for installing the signal transmitter 5 is opened on the base 1, and the third installation groove 13 communicates with the first installation groove 11. The switch of the signal transmitter 5 is controlled by pulling a cable, similar to the switch of the rope-pulling inflatable member 332. A third cable 51 is connected to the signal transmitter 5. One end of the third cable 51 away from the signal transmitter 5 is connected to the warning sign fixing frame 2. When the warning sign fixing frame 2 pops out, it will drive the third cable 51 to pull the switch of the signal transmitter 5, enabling the management center to learn about the situation and position of the non-maintenance opened manhole cover 8 in the first time, facilitating the staff to quickly and accurately reach the scene for handling.

[0059] While the third cable 51 is used to pull the switch of the signal transmitter 5 to control the opening and closing of the signal transmitter 5, it can also effectively prevent the warning sign fixing frame 2 from being washed away by water. The second cable 311 and the third cable 51 work together, enabling the staff to quickly find the inflated warning sign ball 31 and the popped-out warning sign fixing frame 2 after handling the non-inspected opened manhole cover 8. After deflating the warning sign ball 31 and re-winding it, the remaining gas volume of the micro-pressure gas cylinder 32 is checked to see if replacement is needed. Then, each component can be reinstalled to make the warning device reusable.

[0060] Refer to Figure 1 , since there are complex electronic components inside the signal transmitter 5, when the water backs up and pushes the manhole cover 8 open, the water will also enter the first installation groove 11 from the opening and finally enter the third installation groove 13, easily causing the signal transmitter 5 to get wet and malfunction. Therefore, a waterproof layer 17 is attached to the peripheral groove wall of the first installation groove 11 on the base 1. The waterproof layer 17 seals the third installation groove 13, and the second cable 311 can pass through the waterproof layer 17 to be connected to the warning sign fixing frame 2.

[0061] Refer to Figure 1 and Figure 2 , when the staff needs to open the manhole cover 8 for maintenance, to avoid triggering the warning device, a self-locking mechanism 6 for restricting the warning sign fixing frame 2 from being popped out by the energy storage spring 4 is also provided on the base 1. A second installation groove 14 for installing the self-locking mechanism 6 is opened on the base 1, and the second installation groove 14 communicates with the first installation groove 11. In this embodiment, for the convenience of expressing the structure of the warning device, the self-locking mechanism 6 is preferably arranged at one end of the base 1 away from the signal transmitter 5. In other embodiments, it can also be arranged at other positions.

[0062] Refer to Figure 2 ,、 Figure 3 and Figure 4, a self-locking portion 221 for cooperating with the self-locking mechanism 6 is provided on the limiting member 22 at one end of the warning sign fixing bracket 2 away from the energy storage spring 4. The self-locking mechanism 6 includes a self-locking member 61 for cooperating with the self-locking portion 221 to limit the upward pop-up of the warning sign fixing bracket 2 and a self-locking spring 62 for driving the self-locking member 61 to move toward the position where it cooperates with the self-locking portion 221. One end of the self-locking spring 62 is connected to the end of the self-locking member 61 away from the winding rod 21, and the other end of the self-locking spring 62 is connected to a groove wall of the second installation groove 14 away from the winding rod 21. The self-locking spring 62 drives the self-locking member 61 to move in a direction perpendicular to the pop-up direction of the warning sign fixing bracket 2. The waterproof layer 17 also seals the second installation groove 14, and an extension hole 171 for the self-locking member 61 to extend out and cooperate with the self-locking portion 221 for self-locking is provided on the waterproof layer 17. A limiting portion 611 is provided at one end of the self-locking member 61 close to the self-locking spring 62. When the limiting portion 611 abuts against the end face of the waterproof layer 17 close to the second installation groove 14, the self-locking member 61 is located at the position where it cooperates with the self-locking portion 221.

[0063] Referring to Figure 3 and Figure 4 , when the manhole cover 8 is installed on the manhole cover seat 7, the manhole cover 8 presses down on the abutting member 23 to move the warning sign fixing bracket 2 downward. At this time, the position of the self-locking portion 221 is below the self-locking member 61. When the manhole cover 8 is opened during maintenance, the energy storage spring 4 drives the warning sign fixing bracket 2 to pop up. When the warning sign fixing bracket 2 moves upward until the self-locking portion 221 abuts against the self-locking member 61, the self-locking member 61 restricts the warning sign fixing bracket 2 from continuing to move upward, so that the warning device will not be triggered.

[0064] Referring to Figure 1 and Figure 2 , when the manhole cover 8 is not under maintenance, the self-locking mechanism 6 needs to be unlocked. An unlocking member 9 for unlocking the self-locking mechanism 6 is also provided on the base 1. A through hole 18 for the unlocking member 9 to penetrate into the second installation groove 14 is provided on the base 1 along the pop-up direction of the warning sign fixing bracket 2. The through hole 18 communicates with the second installation groove 14 and penetrates through one end of the base 1 close to the manhole cover 8. One end of the unlocking member 9 located in the second installation groove 14 is an unlocking portion 93. A fourth installation groove 19 adapted to the unlocking portion 93 is also provided in the second installation groove 14 on the base 1. The fourth installation groove 19 communicates with the through hole 18 and the second installation groove 14 at the same time. One end of the self-locking member 61 away from the self-locking portion 221 is located outside the base 1. One end of the self-locking member 61 away from the self-locking portion 221 is an operating portion 91 for facilitating the operation of the self-locking member 61 by the staff. Between the unlocking portion 93 and the operating portion 91 is a through portion 92 adapted to the through hole 18.

[0065] Referring to Figure 2 and Figure 4, the self-locking member 61 further extends along a direction perpendicular to the moving direction of the self-locking member 61 toward one end close to the unlocking portion 93 on the limiting portion 611. One end of the limiting portion 611 close to the unlocking portion 93 is an inclined surface, and one end of the unlocking portion 93 close to the limiting portion 611 is also an inclined surface. The inclination degrees of the two inclined surfaces are the same, and one end of the two inclined surfaces close to the self-locking spring 62 is the inclined upper end. When the unlocking member 9 moves downward along the through hole 18 until the two inclined surfaces abut against each other and then the unlocking member 9 continues to move downward, at this time, through the cooperation of the two inclined surfaces, the unlocking portion 93 can be driven to move downward to drive the limiting portion 611, that is, the self-locking member 61, to move toward the direction close to the self-locking spring 62. When the distance between the limiting portion 611 and the waterproof layer 17 is equal to the size of the unlocking portion 93 when the limiting portion 611 moves toward the self-locking spring 62, the unlocking portion 93 will be clamped between the limiting portion 611 and the waterproof layer 17. Finally, when the unlocking portion 93 moves downward until it abuts against the self-locking member 61 and then stops moving, at this time, the self-locking cooperation relationship between the self-locking member 61 and the self-locking portion 221 is released. When the warning sign fixing frame 2 pops up upward, the self-locking member 61 no longer abuts against the self-locking portion 221.

[0066] The downward movement of the unlocking member 9 can release the self-locking cooperation between the self-locking mechanism 6 and the self-locking portion 221. At this time, the unlocking portion 93 will be clamped and positioned between the limiting portion 611 and the waterproof layer 17. At this time, after the manhole cover 8 is opened, the warning sign fixing frame 2 can pop up; the upward movement of the unlocking member 9 can restore the self-locking cooperation between the self-locking mechanism 6 and the self-locking portion 221. At this time, the unlocking portion 93 will be positioned in the fourth installation groove 19, and at this time, after the manhole cover 8 is opened, the warning sign fixing frame 2 will not pop up either, which is convenient for the staff to open the manhole cover 8 for maintenance.

[0067] Referring to Figure 1 and Figure 2 , a relief hole 81 through which the operating portion 91 passes is formed in the manhole cover 8. The aperture of the relief hole 81 is larger than that of the operating portion 91, and the size of the operating portion 91 is larger than that of the through portion 92. To facilitate the staff to operate the unlocking member 9 when the manhole cover 8 is not opened, the staff can insert a specific tool into the relief hole 81 to cooperate with the operating portion 91 to control the movement of the unlocking member 9. In this embodiment, it is preferably that the operating portion 91 is a convex structure. The staff can hook the convex structure with a hook tool to control the unlocking member 9 to move upward, and press down the operating portion 91 with a rod-shaped tool to control the unlocking member 9 to move downward. In other embodiments, the operating portion 91 can also be selected as a ring structure or other structures convenient for the staff to cooperate with tools for operation.

[0068] The implementation principle of the anti-falling hazard warning device after the manhole cover is opened in the embodiment of the present application is as follows:

[0069] After controlling the unlocking member 9 to move downward so that the self-locking mechanism 6 and the self-locking portion 221 are in contact and self-locking cooperation, the warning device is in a working state. When the manhole cover 8 is opened in a non-maintenance state, the energy storage spring 4 will drive the warning sign fixing frame 2 to pop up from the manhole cover seat 7. During the process of the warning sign fixing frame 2 popping up, the first cable 331 and the third cable 51 will be subjected to tension and trigger the rope-pulling type inflating member 332 to open and the signal transmitter 5 to open respectively. Thus, the micro-pressure gas cylinder 32 inflates the warning sign ball 31 to make the warning sign ball 31 expand. The second cable 311 makes the warning sign ball 31 float on the water surface around the outside of the well seat to play a warning role. At the same time, the signal transmitter 5 transmits the position information of the opened manhole cover 8 to the management center, facilitating the staff to arrive at the scene for subsequent processing;

[0070] After the warning device is used up, the staff retracts the warning sign fixing frame 2 and the warning sign ball 31 through the first cable 331, the second cable 311 and the third cable 51. After checking the signal transmitter 5, the rope-pulling type inflating member 332, the self-locking mechanism 6 and the micro-pressure gas cylinder 32, the warning sign ball 31 is deflated and rewound. After the first cable 331, the second cable 311 and the third cable 51 are connected, the manhole cover 8 is covered. After controlling the unlocking member 9 to move downward to unlock the self-locking mechanism 6, the warning device can still be used continuously;

[0071] When the staff needs to open the manhole cover 8 for maintenance, the staff needs to first control the unlocking member 9 to move upward to restore the self-locking cooperation between the self-locking mechanism 6 and the self-locking portion 221 before opening the manhole cover 8 for maintenance. At this time, the warning device will be in a locked state.

[0072] The above are all the preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A warning device for preventing the risk of falling after a manhole cover is opened, characterized in that, Comprising: A base (1), the base (1) is connected to the inner side of the well cover seat (7), a first installation groove (11) is formed on the base (1), and the first installation groove (11) penetrates through one end of the base (1) to form an opening; A warning sign fixing frame (2), the warning sign fixing frame (2) is arranged in the first installation groove (11); A warning sign mechanism (3), the warning sign mechanism (3) is arranged on the warning sign fixing frame (2); A storage spring (4), one end of the storage spring (4) is connected to the bottom of the first installation groove (11) of the base (1), and the other end of the storage spring (4) is connected to the bottom of the warning sign fixing frame (2); Wherein, the top of the warning sign fixing frame (2) abuts against the bottom of the well cover (8), and the downward pressure of the well cover (8) drives the warning sign fixing frame (2) to compress the storage spring (4); The warning sign mechanism (3) includes: A warning sign ball (31), the warning sign ball (31) is arranged on the warning sign fixing frame (2); A micro-pressure gas cylinder (32), the micro-pressure gas cylinder (32) is connected to the warning sign fixing frame (2), and the micro-pressure gas cylinder (32) is connected to the warning sign ball (31); A trigger assembly (33); Wherein, after the warning sign fixing frame (2) leaves the base (1), the trigger assembly (33) controls the micro-pressure gas cylinder (32) to inflate the warning sign ball; The trigger assembly (33) includes: A pull-cord type inflator (332), the pull-cord type inflator (332) is simultaneously connected to the warning sign ball (31), the micro-pressure gas cylinder (32) and the warning sign fixing frame (2); A first cable (331), one end of the first cable (331) is connected to the pull-cord type inflator (332), and the other end of the first cable (331) is connected to the base (1); Wherein, a plurality of first connection points (15) for connecting the first cable (331) are arranged on the base (1); A second cable (311) is further connected to the warning sign ball (31), and the end of the second cable (311) far from the warning sign ball (31) is connected to the first connection point (15); A self-locking part (221) is arranged on the warning sign fixing frame (2), a self-locking mechanism (6) is arranged on the base (1), a second installation groove (14) for installing the self-locking mechanism (6) is formed on the base (1), the self-locking mechanism (6) includes a self-locking part (61) for cooperating with the self-locking part (221) and a self-locking spring (62) for driving the self-locking part (61) to move towards the self-locking part (221), one end of the self-locking spring (62) is connected to the self-locking part (61), and the other end of the self-locking spring (62) is connected to the groove wall of the second installation groove (14) of the base (1); The base (1) is further provided with an unlocking member (9) for releasing the self-locking between the self-locking member (61) and the self-locking portion (221), and the base (1) is provided with a penetration hole (18) for the unlocking member (9) to penetrate, one end of the penetration hole (18) is communicated with the second mounting groove (14), and the other end of the penetration hole (18) penetrates the base (1) in a direction close to the manhole cover (8), one end of the unlocking member (9) is located in the second mounting groove (14), and the manhole cover (8) is provided with a clearance hole (81) for the unlocking member (9) to penetrate away from the self-locking mechanism (6), and the clearance hole (81) penetrates the manhole cover (8) and is communicated with the penetration hole (18).

2. The anti-falling hazard warning device after the manhole cover is opened according to claim 1, wherein, The base (1) is also provided with a signal transmitter (5) for transmitting the position information of the opened manhole cover (8) back to the management center, and the base (1) is provided with a third installation slot (13) for installing the signal transmitter (5).

3. The anti-falling hazard warning device after the manhole cover is opened according to claim 1, characterized in that, The base (1) is provided with a guide rod (12) in the first installation groove (11) for guiding the ejection direction of the warning sign fixing frame (2), and the warning sign fixing frame (2) is provided with a guide groove (24) adapted to the guide rod (12).

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