Well cover opening pry with convenient unblocking

Abstract

The utility model provides a kind of well lid opening crowbar of facilitating breaking down, including crowbar, crowbar head, the breaking down device of drillable and the lifting hook for lifting well lid, the one end of crowbar is support end, its other end is force end, the lifting hook is vertically arranged on the side wall of crowbar, and close to the support end of crowbar, there is accommodating hole in the support end of crowbar, the breaking down device is retractable and can be rotatably arranged in the accommodating hole of crowbar, crowbar head is detachably installed in the support end of crowbar, after crowbar head is detached, the breaking down device can be stretched out from the support end of crowbar in accommodating hole, and can be drilled into the vent hole of blocked well lid or the gap of well lid, the vent hole of well lid or the gap of well lid is broken down, after crowbar head is installed, the breaking down device can be hidden, so as to be retracted in accommodating hole, the lifting hook can be hooked in the vent hole of well lid, crowbar head can be placed on well lid or outside well lid, the force end of crowbar is lifted upwards, the lifting hook can be pulled upwards, and the well lid is lifted by lifting hook.

Description

Technical Field

[0001] This utility model relates to the field of manhole cover opening pry tool technology, specifically to a manhole cover opening pry tool that facilitates unblocking. Background Technology

[0002] With the acceleration of urbanization, the scale of underground pipe networks is growing exponentially. Inspection manholes, as key nodes in these systems, undertake core functions such as equipment maintenance, pipe dredging, and fault diagnosis. Their safety and maintainability directly impact the operational efficiency of urban infrastructure. Manhole covers, as core components of inspection manholes, possess crucial functions of load-bearing, sealing, and opening / closing. They can withstand the pressure generated by high-volume, high-speed traffic and effectively prevent vehicles, pedestrians, and foreign objects from entering, thus ensuring the normal operation of underground pipe networks and equipment.

[0003] Currently, during routine maintenance, workers typically open manhole covers by using a hook to pull them open through the vent. However, cast iron and composite material manhole covers commonly used in municipal underground pipe systems are quite heavy, making them extremely difficult to open with traditional hooks. More importantly, during the rainy season, sediment buildup significantly increases friction between the manhole cover and its base, with some covers even being completely buried. Furthermore, manhole covers that have been severely corroded by rainwater over time are prone to getting stuck in their bases. These conditions all contribute to severe blockages between the cover and base, drastically increasing opening resistance and making opening even more difficult. Existing opening tools are insufficient to meet these needs. Workers are forced to carry additional tools such as pry bars and hammers, making manual manhole cover opening time-consuming, labor-intensive, and inconvenient, severely reducing work efficiency. Utility Model Content

[0004] In view of this, it is necessary to provide a convenient manhole cover opening pry tool to solve the technical problem of inconvenient manhole cover opening in the existing technology.

[0005] The technical solution adopted by this utility model to solve its technical problem is: A convenient manhole cover opening pry tool includes a pry bar, a pry head, a drillable blockage-breaking device, and a lifting hook for lifting the manhole cover. One end of the pry bar is a support end, and the other end is a force-applying end. The lifting hook is vertically mounted on the side wall of the pry bar, close to the support end. A receiving hole is provided at the support end of the pry bar. The blockage-breaking device is telescopically and rotatably mounted in the receiving hole of the pry bar. The pry head is detachably mounted on the support end of the pry bar. After the pry head is removed... The unblocking device extends the support end of the pry bar from the receiving hole and can drill into the vent hole or gap of the blocked manhole cover to unblock it. After the pry head is installed, the unblocking device can be hidden and retracted into the receiving hole. The lifting hook can hook into the vent hole of the manhole cover. The pry head can rest on the manhole cover or on the outside of the manhole cover. By lifting the force-applying end of the pry bar upward, the lifting hook can be pulled upward to pry up the manhole cover.

[0006] Preferably, the unblocking device includes a twist drill, a spring, and guide blocks that match the spiral groove of the twist drill. Two guide blocks are symmetrically fixed to the inner wall of the receiving hole port. The spring is inserted into the receiving hole of the pry bar along its length. The shank of the twist drill is inserted into the receiving hole and abuts against the end of the spring. The drill bit faces the opening of the receiving hole, and the two guide blocks at the receiving hole port are correspondingly engaged in the spiral groove of the twist drill. Under the elastic force of the spring, the drill bit can extend out of the receiving hole. The pry bar can press and apply force to the twist drill extending out of the receiving hole, causing the drill bit to press against the vent hole or gap of the blocked well cover. After the pressing force of the pry bar exceeds the elastic force of the spring, the twist drill can retract into the receiving hole. During the retraction process, it rotates under the guidance of the guide blocks to drill and unblock the vent hole or gap of the well cover.

[0007] Preferably, the force-applying end of the pry bar is further provided with a striking device for striking the manhole cover. The striking device includes a striking head, a connecting arm, and a counterweight. The connecting arm is located at the force-applying end of the pry bar, coaxially arranged with the pry bar, and parallel to the pry bar. The striking head is located at the end of the connecting arm away from the pry bar. A sliding channel for accommodating the counterweight is provided inside the connecting arm. One end of the sliding channel is close to the striking head, and the other end of the sliding channel is close to the pry bar. The counterweight is movably arranged in the sliding channel and slides freely along the sliding channel. When the pry bar drives the striking head to strike the manhole cover vertically downwards, the counterweight is thrown towards the end of the sliding channel away from the striking head under the action of inertia. After the striking head strikes the manhole cover, the counterweight, under the action of inertia, quickly impacts the striking head along the sliding channel to form a secondary strike on the manhole cover.

[0008] Preferably, the outer wall of the connecting arm is provided with an anti-slip sleeve.

[0009] Preferably, the pry bar has a fixing head on the side wall near its supporting end, and there are at least two lifting hooks. Each lifting hook has a connector on its hook handle that matches the fixing head, and the connector on any lifting hook can be detachably connected to the fixing head.

[0010] Preferably, the shank length of each of the lifting hooks is different.

[0011] Preferably, each of the lifting hooks has anti-slip protrusions on the end face where it hooks into the vent hole of the manhole cover.

[0012] Preferably, the prying surface of the pry head is also provided with anti-slip protrusions.

[0013] As can be seen from the above technical solution, the convenient manhole cover opening pry tool provided in this application includes a pry bar, a pry head, a drillable blockage-breaking device, and a lifting hook for lifting the manhole cover. One end of the pry bar is a support end, and the other end is a force-applying end. The lifting hook is vertically mounted on the side wall of the pry bar, close to the support end of the pry bar. A receiving hole is provided at the support end of the pry bar. The blockage-breaking device is telescopically and rotatably mounted in the receiving hole of the pry bar. The pry head is detachably mounted on the support end of the pry bar to conceal the blockage-breaking device. Its beneficial effect is that when opening the manhole cover, the pry head can be used to loosen the manhole cover. The manhole cover can be easily opened by using a pry bar and a lifting hook. When the vent hole of the manhole cover or the gap between the manhole cover and the base is severely blocked, and the manhole cover cannot be opened smoothly, the pry bar can be disassembled and the blockage-breaking device can be used to break the blockage in the vent hole or the gap of the manhole cover. This manhole cover opening pry bar integrates functions such as prying, hooking, drilling and hammering. It is convenient to use, labor-saving and easy to carry. It can handle the opening of manhole covers in different complex situations and improve the efficiency of manhole cover opening. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the utility model.

[0015] Figure 2 This is a schematic diagram of the structure of the utility model after the pry bar has been disassembled.

[0016] Figure 3 This is an exploded structural diagram of the utility model.

[0017] Figure 4 This is a schematic diagram of the cross-sectional structure of the pry bar.

[0018] Figure 5 This is a schematic diagram of the structure of lifting hooks of different lengths.

[0019] Figure 6 This is a schematic diagram of the striking device.

[0020] Figure 7This is a cross-sectional structural diagram of the striking device.

[0021] Figure 8 This is a schematic diagram illustrating the usage state of opening the manhole cover using this utility model.

[0022] In the diagram: pry bar 10, receiving hole 11, fixing head 12, pry head 20, blockage breaking device 30, twist drill 31, spring 32, guide block 33, lifting hook 40, connector 41, anti-slip protrusion 42, striking device 50, striking head 51, connecting arm 52, counterweight block 53, sliding channel 54, anti-slip sleeve 55, vent hole 56. Detailed Implementation

[0023] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 8This utility model provides a convenient manhole cover opening pry tool, including a pry bar 10, a pry head 20, a drillable blockage-breaking device 30, and a lifting hook 40 for lifting the manhole cover. One end of the pry bar 10 is a support end, and the other end is a force-applying end. The lifting hook 40 is vertically arranged on the side wall of the pry bar 10, close to the support end of the pry bar 10. A receiving hole 11 is provided at the support end of the pry bar 10. The blockage-breaking device 30 is telescopically and rotatably installed in the receiving hole 11 of the pry bar 10. A thread is provided at the support end of the pry bar 10. The pry head 20 is a flat metal head. The pry head 20 is detachably installed at the support end of the pry bar 10 by means of threaded engagement. After the pry head 20 is installed, it can hide the blockage-breaking device 30, allowing it to retract into the receiving hole 11 for opening the manhole cover. When opening the manhole cover, the pry bar 10 can be held by hand, and the hook 40 can be hooked into the vent hole of the manhole cover. The end of the pry bar 10 with the pry head 20 can be placed on the manhole cover or the manhole seat on the outer edge of the manhole cover. The force-applying end of the pry bar 10 can be manually lifted upwards to pull the hook 40 upwards and use the hook 40 to pry up the manhole cover. Alternatively, the pry head 20 can be inserted into the gap between the manhole cover and the manhole seat to pry the manhole cover, loosen it, and then use the hook 40 to pry it up. When the vent hole of the manhole cover or the gap between the manhole cover and the manhole seat is severely blocked and the manhole cover cannot be opened smoothly, the pry head 20 can be removed so that the unblocking device 30 extends out of the receiving hole 11 from the support end of the pry bar 10. The unblocking device 30 can be drilled into the blocked vent hole of the manhole cover or the gap between the manhole cover and the manhole seat to unblock it, so that the hook 40 or the pry head 20 can apply force to the manhole cover.

[0025] Specifically, the unblocking device 30 includes a twist drill 31, a spring 32, and guide blocks 33 that match the spiral groove of the twist drill 31. A receiving hole 11 is opened along the length of the pry bar 10. Two guide blocks 33 are symmetrically fixed to the inner wall of the receiving hole 11. The spring 32 is a compression spring, inserted into the receiving hole 11 along the length of the pry bar 10. The shank of the twist drill 31 is inserted into the receiving hole 11 and abuts against the end of the spring 32. The drill bit of the twist drill 31... With its head facing the opening of the receiving hole 11, and two guide blocks 33 located at the port of the receiving hole 11 respectively, the twist drill 31 is locked in the spiral groove of the twist drill 31. Under the elastic force of the spring 32, the drill bit end of the twist drill 31 can extend out of the receiving hole 11 on its own. When the pry head 20 is installed on the support end of the pry bar 10, the twist drill 31 can be pushed into the receiving hole 11 for concealment using the pry head 20. When the vent hole of the manhole cover or the gap between the manhole cover and the manhole seat is severely blocked, and the manhole cover cannot be opened smoothly, the pry head 20 can be used to push the twist drill 31 into the receiving hole 11 for concealment. When the pry bar 20 is disassembled, the twist drill 31, under the elastic force of the spring 32, can extend out of the receiving hole 11 on its own. In use, the operator can hold the pry bar 10, insert the twist drill 31 downwards into the vent hole of the well cover or the gap between the well cover and the well seat, and press the pry bar 10 downwards. When the downward pressure from the pry bar 10 exceeds the elastic force of the spring 32, the twist drill 31 can retract into the receiving hole 11. During the retraction process, it rotates under the guidance of the guide block 33. During the rotation of drill 31, it can drill holes to break blockages in the ventilation holes of the well cover or the gaps between the well cover and the well seat. During this process, the pry bar 10 can be repeatedly moved up and down to drive the twist drill 31 to drill holes and break blockages. The twist drill 31 can be used to clean the ventilation holes of the well cover or the gaps between the well cover and the well seat. After cleaning, the pry head 20 is installed, and the well cover can be opened by the pry head 20 or the lifting hook 40. After the pry head 20 is installed, it can hide and protect the twist drill 31, and the pry head 20 can be used normally.

[0026] In this embodiment, the force of the pry bar 10 pressing down works on the spring 32, causing the spring 32 to contract and deform, thereby causing the twist drill 31 to rotate and drill during the retraction process. In order to ensure that the twist drill 31 can drill smoothly and can be smoothly put into the receiving hole 11, the minimum support force provided by the spring 32 to the twist drill 31 should be greater than 40N. Furthermore, when the pressure applied by the pry bar 10 to the twist drill 31 is greater than 80N to 100N, the amount of compression of the spring 32 should be sufficient to ensure that the twist drill 31 retracts into the receiving hole 11.

[0027] In this embodiment, the guide block 33 is welded and fixed to the end of the receiving hole 11 of the pry bar 10. In order to facilitate the smooth installation of the twist drill 31 and the spring 32 in the receiving hole 11, the end of the receiving hole 11 and the pry bar 10 are detachably connected by a threaded connection. When assembling the twist drill 31 and the spring 32, the end of the receiving hole 11 can be disassembled, the twist drill 31 and the spring 32 can be inserted into the receiving hole, and then the end of the receiving hole 11 can be installed with the pry bar 10.

[0028] Please refer to Figure 1 , Figure 6 and Figure 7 Furthermore, the force-applying end of the pry bar 10 is also provided with a striking device 50 for striking the manhole cover. The striking device 50 includes a striking head 51 for striking the manhole cover, a connecting arm 52, and a counterweight block 53. The connecting arm 52 is located at the force-applying end of the pry bar 10, coaxially arranged with the pry bar 10, and parallel to the pry bar 10. The striking head 51 is a metal hammer head, located at the end of the connecting arm 52 away from the pry bar 10. The connecting arm 52 has a hollow tube structure, and its central cavity forms a sliding channel 54 for accommodating the counterweight block 53. One end of the sliding channel 54 is close to the striking head 51, and the other end of the sliding channel 54 is close to the pry bar 10. The counterweight block 53 is movably arranged in the sliding channel 54 and moves along the sliding channel 54. One end of the sliding channel 54 is detachable, facilitating the installation of the counterweight block 53. During the opening of the manhole cover, if the manhole cover is stuck in the manhole seat and cannot be opened smoothly, the pry bar 10 can be flipped, and the pry bar 10 can be used to drive the striking head 51 to strike the manhole cover vertically downwards, loosening it. When the striking head 51 strikes the manhole cover, the counterweight block 53 is thrown towards the end of the sliding channel 54 away from the striking head 51 under the action of inertia. After the striking head 51 strikes the manhole cover, the counterweight block 53, under the action of inertia, quickly impacts the striking head 51 along the sliding channel 54. Under the impact force of the counterweight block 53, the striking head 51 can form a secondary strike on the manhole cover, thus increasing the striking force and frequency of the striking head 51 on the manhole cover.

[0029] Furthermore, in this embodiment, the striking device 50 is installed after the force-applying end of the pry bar 10, which lengthens the pry bar 10 and can be used as a handle for the pry bar 10. This makes it easier for the pry bar 10 to apply force to the lifting hook 40 when the well cover is opened by the lifting hook 40. In addition, for ease of use, an anti-slip sleeve 55 is provided on the outer wall of the connecting arm 52 of the striking device 50, so that the worker can hold the connecting arm 52 to apply force.

[0030] In addition, in this embodiment, the outer diameter of the counterweight block 53 should be smaller than the inner diameter of the sliding channel 54, and exhaust holes 56 are respectively opened at both ends of the sliding channel 54 in the connecting arm 52. The exhaust holes 56 are opened towards the side wall of the connecting arm 52 and communicate with the outside of the connecting arm 52, so as to ensure that the counterweight block 53 can slide smoothly to both ends of the sliding channel 54 without being affected by air resistance.

[0031] In the above embodiments, in order to facilitate use and enable the counterweight block 53 to exert an effective impact force, the weight of the counterweight block 53 is preferably 0.2-0.5 kg.

[0032] Please refer to Figure 1 and Figure 5 Furthermore, since manhole covers made of different materials have different thicknesses, the hook shank length of the hook 40 used for opening them also varies. To facilitate the opening of manhole covers made of different materials, the hook 40 in the above embodiment is designed to be detachable and replaceable. Specifically, a fixing head 12 is provided on the side wall of the pry bar 10, and the fixing head 12 is close to the support end of the pry bar 10. There are at least two hooks 40, and the hook shank length of each hook 40 is different and adapted to the manhole cover to be opened. Each hook 40 has a connector 41 that matches the fixing head 12. The connector 41 on any hook 40 and the fixing head 12 are detachably connected by a threaded connection. In actual use, the hook 40 that matches the thickness or type of the manhole cover to be opened can be replaced. After the manhole cover opening is completed, the hook 40 can be disassembled for easy storage.

[0033] Please refer to Figure 3 Furthermore, each hook 40 is provided with anti-slip protrusions 42 on the end face where it hooks into the vent hole of the manhole cover. This increases the friction between the hook 40 and the manhole cover and reduces the occurrence of the hook 40 detaching from the manhole cover during the lifting process.

[0034] Please continue reading. Figure 3 Furthermore, the pry head 20 is also provided with anti-slip protrusions 42 on the pry surface that contacts the manhole cover. During use, this can increase the friction between the pry head 20 and the manhole cover, making it easier for the pry head 20 to apply force to the manhole cover.

[0035] In the above embodiments, the pry bar 10, pry head 20, lifting hook 40, and striking head 51 are all made of metal.

[0036] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Those skilled in the art can understand that implementing all or part of the above-described embodiments and making equivalent changes in accordance with the claims of the present utility model are still within the scope of the utility model.

Claims

1. A convenient manhole cover opening pry tool, characterized in that: The device includes a pry bar, a pry head, a drillable plug-breaking device, and a hook for lifting manhole covers. One end of the pry bar is a support end, and the other end is a force-applying end. The hook is vertically mounted on the side wall of the pry bar, close to the support end. A receiving hole is provided at the support end of the pry bar. The plug-breaking device is telescopically and rotatably mounted in the receiving hole of the pry bar. The pry head is detachably mounted on the support end of the pry bar. After the pry head is removed, the plug-breaking device can extend from the support end of the pry bar through the receiving hole and drill into the vent hole or gap of the manhole cover to break the blockage. After the pry head is installed, it can conceal the plug-breaking device, allowing it to retract into the receiving hole. The hook can hook into the vent hole of the manhole cover. The pry head can rest on the manhole cover or on the outside of the manhole cover. By lifting the force-applying end of the pry bar upwards, the hook can be pulled upwards to pry up the manhole cover.

2. The manhole cover opening pry tool for facilitating unblocking as described in claim 1, characterized in that: The unblocking device includes a twist drill, a spring, and two guide blocks that match the spiral groove of the twist drill. The guide blocks are symmetrically fixed to the inner wall of the receiving hole. The spring is inserted into the receiving hole of the pry bar along its length. The shank of the twist drill is inserted into the receiving hole and abuts against the end of the spring. The drill bit faces the opening of the receiving hole, and the two guide blocks at the receiving hole are correspondingly engaged in the spiral groove of the twist drill. Under the elastic force of the spring, the drill bit can extend out of the receiving hole. The pry bar can press and apply force to the twist drill extending out of the receiving hole, causing the drill bit to press against the vent hole or gap of the blocked well cover. When the pressing force of the pry bar is greater than the elastic force of the spring, the twist drill can retract into the receiving hole. During the retraction process, it rotates under the guidance of the guide blocks to drill and unblock the vent hole or gap of the well cover.

3. The manhole cover opening pry tool for facilitating unblocking as described in claim 2, characterized in that: The pry bar is also equipped with a striking device for striking the manhole cover at the force-applying end. The striking device includes a striking head, a connecting arm, and a counterweight. The connecting arm is located at the force-applying end of the pry bar, coaxial with the pry bar, and parallel to the pry bar. The striking head is located at the end of the connecting arm away from the pry bar. A sliding channel for accommodating the counterweight is provided inside the connecting arm. One end of the sliding channel is close to the striking head, and the other end is close to the pry bar. The counterweight is movably disposed in the sliding channel and slides freely along the sliding channel. When the pry bar drives the striking head to strike the manhole cover vertically downwards, the counterweight is thrown towards the end of the sliding channel away from the striking head under the action of inertia. After the striking head strikes the manhole cover, the counterweight, under the action of inertia, quickly impacts the striking head along the sliding channel to form a secondary strike on the manhole cover.

4. The manhole cover opening pry tool for facilitating unblocking as described in claim 3, characterized in that: The outer wall of the connecting arm is provided with an anti-slip sleeve.

5. The manhole cover opening pry tool for facilitating unblocking as described in claim 1 or 4, characterized in that: The pry bar has a fixing head on its side wall near its support end. There are at least two lifting hooks, and each lifting hook has a connector that matches the fixing head on its hook handle. The connector on any lifting hook can be detachably connected to the fixing head.

6. The manhole cover opening pry tool for facilitating unblocking as described in claim 5, characterized in that: The shank length of each of the aforementioned hooks is different.

7. The manhole cover opening pry tool for facilitating unblocking as described in claim 6, characterized in that: Each of the hooks is provided with anti-slip protrusions on the end face that hooks into the vent hole of the manhole cover.

8. The manhole cover opening pry tool for facilitating unblocking as described in claim 7, characterized in that: The pry bar also has anti-slip protrusions on its pry surface.

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