Cover plate unlocking device

Abstract

The utility model provides a cover plate unlocking device which comprises a lock mechanism (50), a control module (5) and a cover plate (2). The device is characterized in that the lockset mechanism (50) is used for unlocking and locking the cover plate (2) and comprises a spring bolt (12), a cam (18), a spring bolt spring (13) and a direct current motor used for driving the cam (18); the control module (5) comprises a motor driving unit (51), a spring bolt position detection unit (52), a cover plate position detection unit (53), a digital processing unit (55) and a communication unit (56); the cover plate (2) is used for extruding the lock tongue by using the lip part of the lock groove on the cover plate to enable the lock tongue to retract into the tongue cavity, and then the lock tongue enters the lock groove on the cover plate under the pushing of the spring; and a lock groove (21) is included. The structure is simple, and the cover plate clamping fault occurring in the unlocking process can be recognized and eliminated in an auxiliary mode.

Description

Technical Field

[0001] This utility model relates to the field of smart manhole covers, and in particular to a cover plate unlocking device. Background Technology

[0002] Water transmission networks are widely used in fire protection, agricultural irrigation, and reclaimed water utilization. To ensure convenient, accurate, and safe water intake from water transmission networks, appropriate designs are needed for the protective covers at the water intake end, water pipe interfaces, flow control, and other aspects.

[0003] Patent application CN202110314844.3, entitled "Smart Firefighting Manhole Cover," discloses a manhole cover comprising a frame structure, a cover body, multiple movable blocks, a drive mechanism, a monitoring mechanism, and a control unit. The frame structure has a receiving cavity with a top opening. The cover body is placed over the opening, and multiple drainage holes are provided at the ends of the cover body. The drive mechanism is connected to the movable blocks, which move up and down along the height direction of the frame structure under the drive of the drive mechanism to close or open the drainage holes. The control unit is communicatively connected to an Internet of Things (IoT) system. The monitoring mechanism is used to monitor water flow and send water volume signals to the control unit, which acquires the water volume signals and controls the movement of the drive mechanism.

[0004] Patent application CN202120014361.7, entitled "A Manhole Cover for Smart Firefighting," discloses a manhole cover comprising a manhole opening. The inner wall of the manhole opening has a placement groove, a circular groove, and an annular groove. A sliding groove is also provided on the inner wall of the manhole opening, communicating with the annular groove. A disc is slidably connected to the inner wall of the placement groove. A circular tube is fixedly connected to the bottom of the disc, and a manhole cover body is slidably connected to the bottom of the circular tube. A through groove is provided at the top of the disc and the manhole cover body. The surface of the manhole cover body is slidably connected to the inner wall of the circular groove, and a movable plate is slidably connected to the inner wall of the annular groove. This invention, by setting up through grooves, a disc, a circular tube, and a locking block, allows firefighters to replenish water to fire trucks without opening the manhole cover body by rotating the disc to align the through groove on the disc with the through groove on the manhole cover body, achieving convenient water access.

[0005] Patent application CN201510501479.1, entitled "A Safe IoT-Based Smart Manhole Cover," describes a manhole cover comprising a cylindrical body with a pull-out hole and a normally open button on the bottom edge. The cover contains a battery, a controller, and a Wi-Fi module. The controller is connected to the battery, the normally open button, and the Wi-Fi module. A locking mechanism is located on the side wall of the cover, comprising a motor, a threaded rod connected to the motor shaft, and an internally threaded post fitted onto the threaded rod. The motor shaft is parallel to the plane of the manhole cover, and the internally threaded post is located on the side furthest from the center of the manhole cover. The controller is connected to the motor. This invention allows the manhole cover to be locked by the locking mechanism, reducing the possibility of theft and displacement. The manhole cover can trigger an alarm when opened and can simultaneously receive and transmit Wi-Fi signals. Interconnected network connections between manhole covers reduce the need for network transmission station construction and lower costs.

[0006] The drawbacks of existing manhole cover unlocking technology are: the unlocking and locking structure of the cover plate is complex, and it cannot identify and assist in eliminating the cover plate jamming fault that occurs during unlocking. Summary of the Invention

[0007] The device provided by this utility model is used to overcome at least one of the shortcomings of existing manhole cover unlocking technologies, such as complex unlocking and locking structures of the cover plate and inability to identify and assist in eliminating cover plate jamming faults during unlocking. It has a simple structure, can identify and assist in eliminating cover plate jamming faults during unlocking, and is easy to operate, install, and maintain.

[0008] This utility model provides a method for unlocking a cover plate, including:

[0009] Rotate the cam so that the cam's centroid changes from pointing in the direction of the latch retraction to pointing in the direction of the latch extension, and use the latch spring to push the latch to move along the slide and extend out of the latch cavity;

[0010] The latch is pressed against the lip of the lock groove on the cover plate to retract into the tongue cavity, and then the latch is pushed into the lock groove on the cover plate by the spring.

[0011] Rotate the cam so that the cam's centroid changes from pointing in the direction of the bolt extension to pointing in the direction of the bolt retraction. Use the cam's convex surface to push the bolt along the slide and move it out of the lock groove on the cover plate.

[0012] The cam's telecentric point is the point on the cam's cam surface that is farthest from the cam's axis of rotation.

[0013] This utility model provides a cover unlocking device, comprising:

[0014] The lock mechanism (50), control module (5), and cover plate (2) are characterized in that,

[0015] The locking mechanism (50) for unlocking and locking the cover plate (2) includes a latch (12), a cam (18), a latch spring (13) and a DC motor for driving the cam (18);

[0016] The control module (5) is used to perform the following control operations on the lock mechanism (50):

[0017] Rotate the cam so that its centroid changes from pointing in the direction of bolt retraction to pointing in the direction of bolt extension, thereby using the bolt spring to push the bolt along the slide and extend it out of the bolt cavity; and / or

[0018] Rotate the cam so that the cam's centroid changes from pointing towards the direction of the bolt extension to pointing towards the direction of the bolt retraction. Use the cam's convex surface to push the bolt along the slide and move it out of the lock groove on the cover plate. It includes a motor drive unit (51), a bolt position detection unit (52), a cover plate position detection unit (53), a digital processing unit (55), and a communication unit (56).

[0019] Cover plate (2) is used to press the bolt into the tongue cavity by the locking groove lip on the cover plate, and then the bolt enters the locking groove on the cover plate under the push of the spring; including locking groove (21).

[0020] The cam's telecentric point is the point on the cam's cam surface that is farthest from the cam's axis of rotation.

[0021] The device described in this specific embodiment of the invention can overcome at least one of the shortcomings of existing manhole cover unlocking technologies, such as complex unlocking and locking structures of the cover plate and inability to identify and assist in eliminating cover plate jamming faults during unlocking. It has a simple structure, can identify and assist in eliminating cover plate jamming faults during unlocking, and is easy to operate, install, and maintain.

[0022] Other features and advantages of this invention will be set forth in the following description. Attached Figure Description

[0023] Figure 1 This is a flowchart of a cover plate unlocking method according to a specific embodiment of this utility model;

[0024] Figure 2 This is a schematic diagram of the structural composition of the lock mechanism as shown in a specific embodiment of this utility model;

[0025] Figure 3 This is a schematic diagram of the structure of the cover plate in the locked state, as shown in a specific embodiment of this utility model.

[0026] Figure 4 This is a schematic diagram of the structure of the cover plate in the unlocked state, as shown in a specific embodiment of this utility model.

[0027] Figure 5This is the composition of the cover plate unlocking control module as shown in the specific embodiment of this utility model.

[0028] In the picture,

[0029] 1. Lock box; 2. Cover plate; 3. Torsion spring; 4. Inner cover;

[0030] 11. Lock box body; 12. Lock tongue; 13. Lock tongue spring; 14. Cam shaft; 15. Lock tongue magnet; 16. Lock tongue sensing element; 17. Cover plate sensing element; 18. Cam;

[0031] 21. Locking groove; 22. Cover plate pivot; 23. Cover plate magnet; 24. Cover plate handle hook;

[0032] 41. Water hose connector; 42. Inner cover handle hook; 43. Inner cover pivot; 44. Water outlet port;

[0033] 5. Control module; 50. Lock mechanism; 51. Motor drive unit; 52. Lock tongue position detection unit; 53. Cover plate position detection unit; 54. Audio unit; 55. Digital processing unit; 56. Communication unit;

[0034] 6. Manhole cover. Detailed Implementation

[0035] The device provided by this utility model is used to overcome at least one of the shortcomings of existing manhole cover unlocking technologies, such as complex unlocking and locking structures of the cover plate and inability to identify and assist in eliminating cover plate jamming faults during unlocking. It has a simple structure, can identify and assist in eliminating cover plate jamming faults during unlocking, and is easy to operate, install, and maintain.

[0036] To make the objectives, technical solutions, and advantages of this utility model clearer, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the specific embodiments and features described in this application can be arbitrarily combined with each other.

[0037] The method and apparatus provided by this utility model will be described below with reference to the accompanying drawings.

[0038] Specific Implementation Method 1: Example of a Cover Plate Unlocking Method

[0039] A specific embodiment of the cover plate unlocking method provided by this utility model is described in [reference needed]. Figure 1 As shown, it includes:

[0040] S110, rotate the cam so that the cam's centroid changes from pointing in the direction of the latch retraction to pointing in the direction of the latch extension, and use the latch spring to push the latch to move along the slide and extend out of the latch cavity;

[0041] S120, the latch is pressed by the lip of the lock groove on the cover plate, causing it to retract into the tongue cavity, and then the latch is pushed into the lock groove on the cover plate by the spring;

[0042] S130, rotate the cam so that the cam's centroid changes from pointing in the direction of the bolt extension to pointing in the direction of the bolt retraction. Use the cam's convex surface to push the bolt along the slide and move it out of the lock groove on the cover plate.

[0043] The cam's telecentric point is the point on the cam's cam surface that is farthest from the cam's axis of rotation.

[0044] See Figure 2 As shown, the lock box (1) includes a lock tongue (12), a cam (18), a lock tongue spring (13) and a bracket. The bracket includes a slide groove and provides mounting support for the lock tongue (12), the cam (18) and the lock tongue spring (13). The lock tongue (12) is a component with a through hole. The cam (18) is located in the through hole. The lock tongue spring (13) is provided on the left side of the lock tongue.

[0045] The cam (18) is mounted on the cam shaft (14), which is driven by a DC motor and controlled by a motor drive module (52).

[0046] During the rotation of the cam (18), the cam's distal point changes from pointing towards the retraction of the latch to pointing towards the extension of the latch. The latch spring (13) pushes the latch (12) to move to the right along the slide and extend out of the latch cavity. At this time, the top of the latch (12) is outside the lock box (1).

[0047] During the process of pushing the locking groove (21) contained in the cover plate (2) to the locking position by rotating the cover plate, the locking tongue (12) retracts into the tongue cavity under the pressure of the locking groove lip on the cover plate. Then, the locking tongue (12) enters the locking groove (21) on the cover plate under the push of the locking tongue spring (13) and locks the cover plate (2).

[0048] As the cam (18) rotates, changing the direction of the cam's centroid from pointing towards the extension of the latch to pointing towards the retraction of the latch, the convex surface of the cam (18) pushes the latch along the slide groove and moves it out of the lock groove (21) on the cover plate, thus releasing the lock on the cover plate (2).

[0049] During the rotation of the cam (18), the cam's distal point changes from pointing towards the extension of the latch to pointing towards the retraction of the latch. The convex surface of the cam (18) pushes the latch (12) to move along the groove and compresses the latch spring (13) located on the left side of the latch (12).

[0050] See Figure 3 As shown, the cover plate (2) of this utility model is a cover plate used to close the water outlet port (44).

[0051] In the locked state, the latch (12) extending from the lock box (1) enters the lock groove on the cover plate (2), preventing the cover plate (2) from opening;

[0052] In the unlocked state, see Figure 4 As shown, the latch (12) moves out of the lock groove (21) on the cover plate (2), and the cover plate (2) opens under the drive of the torsion spring (3).

[0053] The cover plate (2) is rotatably connected to the manhole cover via the cover plate pivot (22).

[0054] See below the cover plate (2). Figure 4 As shown, an inner cover (4) is installed, and the inner cover (4) is rotatably connected to the lower side of the manhole cover through the inner cover pivot (43);

[0055] A hose connector (41) and a water outlet port (44) are installed on the inner cover (4); the hose connector (41) is connected to the water pipe in the well through the hose, and the flexible connection facilitates the angle adjustment of the water outlet port (44); the water outlet port (44) has a water pipe connection slot to facilitate the easy connection between the water outlet port and the water receiving end.

[0056] In this specific embodiment, the cover plate of the present invention is a cover plate (2) for protecting the water intake. The cover plate of the present invention can also be a component for sealing the port of a specific space, including protective cover plates for the ports of various liquid oil or chemical pipelines, and inlet and outlet cover plates of storage boxes.

[0057] The method described in this specific embodiment, wherein...

[0058] The rotating cam, which changes its distal point from pointing towards the retraction of the latch to pointing towards the extension of the latch, and utilizes the latch spring to push the latch along the slide groove and extend out of the latch cavity, specifically includes:

[0059] Before performing the operation of rotating the cam to change the direction of the cam's centroid from pointing towards the retraction of the latch to pointing towards the extension of the latch, and using the latch spring to push the latch along the slide and extend out of the latch cavity, confirm that the cover is in the open position.

[0060] In the locked state, the cover plate (2) is limited by the locking tongue (12) inserted into the locking groove (21) on the cover plate (2). In this locked state, the cover plate (2) is abutting against the manhole cover body. See Figure 3 As shown, when abnormal situations occur, such as the cover plate pivot (22) used by the cover plate (2) being jammed and unable to rotate, or the cover plate (2) and the manhole cover body being stuck together due to snow or ice, the cover plate (2) will not be able to open under the drive of the torsion spring (3).

[0061] If, after the latch (12) is retracted into the lock box (1), the cover plate (2) cannot be opened automatically by the drive of the torsion spring (3), the cam (18) is still rotated so that the cam's centroid changes from pointing in the direction of the latch retraction to pointing in the direction of the latch extension. The latch spring (13) pushes the latch along the slide and extends out of the tongue cavity, thus locking the cover plate (2) again.

[0062] In order to avoid the situation where the cover plate (2) is locked again if the cover plate (2) cannot be opened under the drive of the torsion spring (3), it is necessary to confirm that the cover plate (2) is in the open state before performing the operation of rotating the cam (18) so that the cam's centroid changes from pointing to the direction of the latch retraction to pointing to the direction of the latch extension, and using the latch spring (13) to push the latch along the slide and extend out of the tongue cavity.

[0063] The method described in this specific embodiment, wherein...

[0064] The operation of confirming that the cover is in the open state specifically includes:

[0065] Read the output of the bolt position sensor and use its signal to confirm that the bolt has moved out of the lock slot. Then, read the output of the cover plate position sensor and make the following judgment:

[0066] If the output signal level of the cover plate position sensor is the level L2 corresponding to the cover plate being in the open position, then it is confirmed that the cover plate is in the open state.

[0067] If the output signal level of the cover plate position sensor is the same as the level L1 corresponding to the cover plate being in the locked position, then it is confirmed that the cover plate is in the locked state.

[0068] Specifically, the digital processing unit (55) reads the output of the latch position sensor through the latch position detection unit (52), and uses the read latch position sensor output signal to confirm that the latch has moved out of the lock slot; then, the digital processing unit (55) reads the output signal of the cover plate position sensor through the cover plate position detection unit (53), and makes the following judgment:

[0069] If the output signal level of the cover plate position detection unit (53) is the level L2 corresponding to the cover plate being in the open position, then it is confirmed that the cover plate is in the open state;

[0070] If the output signal level of the cover plate position detection unit (53) is the level L1 corresponding to the cover plate being in the locked position, then it is confirmed that the cover plate is in an abnormal locking state.

[0071] The cover plate position detection unit (53) performs anti-interference or de-jitter processing on the output signal of the cover plate position sensor;

[0072] The latch position detection unit (52) performs anti-interference or de-jitter processing on the output signal of the latch position sensor.

[0073] See Figure 2 As shown, the latch position sensor includes a latch magnet (15) and a latch sensing element (16), wherein the latch sensing element (16) is a Hall element; specifically, the latch sensing element (16) is a Hall switch; the latch magnet (15) is mounted on the latch (12) and moves with the latch (12), while the latch sensing element (16) is mounted on the latch slide rail or the latch bracket and does not move.

[0074] The cover plate position sensor includes a cover plate magnet (23) and a cover plate sensing element (17), wherein the cover plate sensing element (17) is a Hall element; specifically, the cover plate sensing element (17) is a Hall switch; the cover plate magnet (23) is mounted on the cover plate (2) and moves with the cover plate (2), while the cover plate sensing element (17) is mounted on the lock box and does not move.

[0075] The operation of using the output signal of the bolt position sensor to confirm that the bolt has moved out of the bolt slot specifically includes:

[0076] Read the output of the latch sensing element (16). If the output of the latch sensing element (16) is high, it is confirmed that the latch is in the state of being removed from the lock slot; or

[0077] Read the output of the latch sensing element (16). If the output of the latch sensing element (16) is low, it is confirmed that the latch is in the state of being removed from the lock slot.

[0078] Whether a high-level or low-level signal is used to determine if the bolt is out of the lock slot depends on the preset level or the type of Hall switch used.

[0079] In the step of confirming that the cover plate (2) is in the open state, the output signal level of the cover plate position sensor is the output level of the cover plate sensing element (17), specifically the output level of the Hall switch. The output level of the Hall switch corresponding to the open position of the cover plate (2) is represented as level L2, and level L2 is predetermined to be the low level output by the Hall switch. In other words, the cover plate is confirmed to be in the open state when the output level of the Hall switch is low.

[0080] In the step of confirming that the cover plate (2) is in the open state, the output signal level of the cover plate position sensor is the output level of the cover plate sensing element (17), specifically the output level of the Hall switch. When the cover plate (2) is in the locked position, the output level of the Hall switch is represented as level L1, and level L1 is predetermined to be the high level output of the Hall switch, or in other words, the cover plate is confirmed to be in the locked state when the output level of the Hall switch is high.

[0081] The method described in this specific embodiment, wherein...

[0082] After confirming that the cover is in an abnormally locked state, perform the following operations:

[0083] Stop driving the bolt (12) into the locked position;

[0084] The control audio unit (54) issues a voice or sound prompt indicating that the cover (2) is in an abnormally locked state; and / or

[0085] The control audio unit (54) provides instructions via voice on how to open the cover using manual intervention.

[0086] Specifically, after confirming that the cover plate is locked when the latch is already out of the lock groove, it is determined that the cover plate (2) is abnormally opened.

[0087] Furthermore, in order to implement subsequent manual unlocking, a prompt is issued by voice or sound indicating that the cover (2) has failed to enter the open state.

[0088] Specifically, see Figure 5 As shown, the control module (5) includes an audio unit (54) that provides instructions on how to open the cover by manual intervention in a voice manner, including providing the phone number to be dialed or providing instructions on how to push, pull, squeeze or pry a specific component manually.

[0089] The method described in this specific embodiment, wherein...

[0090] After confirming that the cover is in an abnormally locked state, perform the following operations:

[0091] Stop driving the bolt (12) into the locked position;

[0092] The control communication unit (56) establishes a communication connection with the smartphone;

[0093] The communication unit (56) establishes a communication connection with the smartphone, sends the cover plate abnormal locking information to the smartphone, and outlines the steps to remove the cover plate abnormal locking.

[0094] The specific steps of the method described in this utility model are executed by the control module (5), see [link to relevant documentation]. Figure 5As shown, the control module (5) includes a motor drive unit (51), a latch position detection unit (52), a cover plate position detection unit (53), an audio unit (54), a digital processing unit (55), and a communication unit (56); the motor drive unit (51) includes a DC switch circuit for controlling the start and stop of the motor, and controls the DC motor that drives the cam (18) to rotate; the latch position detection unit (52) includes a latch position sensor, see Figure 2 As shown, the latch position sensor includes a latch magnet (15) and a latch sensing element (16), wherein the latch sensing element (16) is a Hall element; specifically, the latch sensing element (16) is a Hall switch; the cover plate position detection unit (53) includes a cover plate position sensor, see Figure 2 As shown, the cover plate position sensor includes a cover plate magnet (23) and a cover plate sensing element (17), wherein the cover plate sensing element (17) is a Hall element; the digital processing unit (55) includes a digital processor circuit, the digital processing unit (55) uses the position information provided by the latch position detection unit (52) to determine the position of the latch (12), the digital processing unit (55) uses the position information provided by the cover plate position detection unit (53) to determine the position of the cover plate (2), and the digital processing unit (55) controls the rotation of the motor through the motor drive unit (51), thereby controlling the position of the latch (12).

[0095] The control module (5) uses its included communication unit (56) to receive unlocking commands. The communication unit (56) includes a wireless communication module, such as Bluetooth or WIFI, to transmit the unlocking control commands.

[0096] Locking mechanism (50), see Figure 2 and Figure 5 As shown, it includes a latch (12), a cam (18), a latch spring (13) and a bracket. The bracket includes a slide groove and provides mounting support for the latch (12), the cam (18) and the latch spring (13). The latch (12) is a component with a through hole. The cam (18) is located in the through hole. The latch spring (13) is provided on the left side of the latch.

[0097] The cam (18) is mounted on the cam shaft (14), which is driven by a DC motor and controlled by a motor drive module (52).

[0098] In the method described in this specific embodiment, see [link to relevant documentation]. Figure 5 As shown, the control module (5), the locking mechanism (50) and the cover plate (2) are all installed on the manhole cover (6), with the manhole cover (6) serving as its installation support; or, in other words, the control module (5), the locking mechanism (50) and the cover plate (2) are components of the manhole cover (6).

[0099] Specific Implementation Method Two: Example of a Cover Unlocking Device

[0100] This utility model provides a specific embodiment of a cover plate unlocking device, comprising:

[0101] The lock mechanism (50), control module (5), and cover plate (2) are characterized in that,

[0102] The locking mechanism (50) for unlocking and locking the cover plate (2) includes a latch (12), a cam (18), a latch spring (13) and a DC motor for driving the cam (18);

[0103] The control module (5) is used to perform the following control operations on the lock mechanism (50):

[0104] Rotate the cam so that its centroid changes from pointing in the direction of bolt retraction to pointing in the direction of bolt extension, thereby using the bolt spring to push the bolt along the slide and extend it out of the bolt cavity; and / or

[0105] Rotate the cam so that the cam's centroid changes from pointing towards the direction of the bolt extension to pointing towards the direction of the bolt retraction. Use the cam's convex surface to push the bolt along the slide and move it out of the lock groove on the cover plate. It includes a motor drive unit (51), a bolt position detection unit (52), a cover plate position detection unit (53), a digital processing unit (55), and a communication unit (56).

[0106] Cover plate (2) is used to press the bolt into the tongue cavity by the locking groove lip on the cover plate, and then the bolt enters the locking groove on the cover plate under the push of the spring; including locking groove (21).

[0107] The cam's telecentric point is the point on the cam's cam surface that is farthest from the cam's axis of rotation.

[0108] See Figure 2 As shown, the lock box (1) includes a lock tongue (12), a cam (18), a lock tongue spring (13) and a bracket. The bracket includes a slide groove and provides mounting support for the lock tongue (12), the cam (18) and the lock tongue spring (13). The lock tongue (12) is a component with a through hole. The cam (18) is located in the through hole. The lock tongue spring (13) is provided on the left side of the lock tongue.

[0109] The cam (18) is mounted on the cam shaft (14), which is driven by a DC motor and controlled by a motor drive module (52).

[0110] During the rotation of the cam (18), the cam's distal point changes from pointing towards the retraction of the latch to pointing towards the extension of the latch. The latch spring (13) pushes the latch (12) to move to the right along the slide and extend out of the latch cavity. At this time, the top of the latch (12) is outside the lock box (1).

[0111] During the process of pushing the locking groove (21) contained in the cover plate (2) to the locking position by rotating the cover plate, the locking tongue (12) retracts into the tongue cavity under the pressure of the locking groove lip on the cover plate. Then, the locking tongue (12) enters the locking groove (21) on the cover plate under the push of the locking tongue spring (13) and locks the cover plate (2).

[0112] As the cam (18) rotates, changing the direction of the cam's centroid from pointing towards the extension of the latch to pointing towards the retraction of the latch, the convex surface of the cam (18) pushes the latch along the slide groove and moves it out of the lock groove (21) on the cover plate, thus releasing the lock on the cover plate (2).

[0113] During the rotation of the cam (18), the cam's distal point changes from pointing towards the extension of the latch to pointing towards the retraction of the latch. The convex surface of the cam (18) pushes the latch (12) to move along the groove and compresses the latch spring (13) located on the left side of the latch (12).

[0114] See Figure 3 As shown, the cover plate (2) of this utility model is a cover plate used to close the water outlet port (44).

[0115] In the locked state, the latch (12) extending from the lock box (1) enters the lock groove on the cover plate (2), preventing the cover plate (2) from opening;

[0116] In the unlocked state, see Figure 4 As shown, the latch (12) moves out of the lock groove (21) on the cover plate (2), and the cover plate (2) opens under the drive of the torsion spring (3).

[0117] The cover plate (2) is rotatably connected to the manhole cover via the cover plate pivot (22).

[0118] See below the cover plate (2). Figure 4 As shown, an inner cover (4) is installed, and the inner cover (4) is rotatably connected to the lower side of the manhole cover through the inner cover pivot (43);

[0119] A hose connector (41) and a water outlet port (44) are installed on the inner cover (4); the hose connector (41) is connected to the water pipe in the well through the hose, and the flexible connection facilitates the angle adjustment of the water outlet port (44); the water outlet port (44) has a water pipe connection slot to facilitate the easy connection between the water outlet port and the water receiving end.

[0120] See Figure 3 and Figure 4As shown, the cover plate (2) includes a cover plate hook (24), and the inner cover (4) includes an inner cover hook (42). When the cover plate (2) is opened upward under the drive of the torsion spring (3), the cover plate hook (24) pushes the inner cover (4) to rotate upward. After the inner cover (4) rotates upward to the predetermined position, the inner cover hook (42) hooks the cover plate hook (24) in a hand-like manner to prevent the cover plate (2) from rotating upward further.

[0121] In this specific embodiment, the cover plate of the present invention is a cover plate (2) for protecting the water intake. The cover plate of the present invention can also be a component for sealing the port of a specific space, including protective cover plates for the ports of various liquid oil or chemical pipelines, and inlet and outlet cover plates of storage boxes.

[0122] The apparatus provided in this specific embodiment is characterized in that,

[0123] The motor drive unit (51) included in the control module (5) is electrically connected to the DC motor included in the lock mechanism (50), and the DC motor drives the cam (18) to rotate through the cam shaft (14);

[0124] Before the control module (5) performs the operation of rotating the cam so that the cam's centroid changes from pointing towards the retraction of the latch to pointing towards the extension of the latch, and using the latch spring to push the latch along the slide and extend out of the tongue cavity, it uses its included cover plate position detection unit (53) and digital processing unit (55) to perform the operation of confirming that the cover plate is in the open state.

[0125] In the locked state, the cover plate (2) is limited by the locking tongue (12) inserted into the locking groove (21) on the cover plate (2). In this locked state, the cover plate (2) is abutting against the manhole cover body. See Figure 3 As shown, when abnormal situations occur, such as the cover plate pivot (22) used by the cover plate (2) being jammed and unable to rotate, or the cover plate (2) and the manhole cover body being stuck together due to snow or ice, the cover plate (2) will not be able to open under the drive of the torsion spring (3).

[0126] If, after the latch (12) is retracted into the lock box (1), the cover plate (2) cannot be opened automatically by the drive of the torsion spring (3), the cam (18) is still rotated so that the cam's centroid changes from pointing in the direction of the latch retraction to pointing in the direction of the latch extension. The latch spring (13) pushes the latch along the slide and extends out of the tongue cavity, thus locking the cover plate (2) again.

[0127] In order to avoid the situation where the cover plate (2) is locked again if the cover plate (2) cannot be opened under the drive of the torsion spring (3), it is necessary to confirm that the cover plate (2) is in the open state before performing the operation of rotating the cam (18) so that the cam's centroid changes from pointing to the direction of the latch retraction to pointing to the direction of the latch extension, and using the latch spring (13) to push the latch along the slide and extend out of the tongue cavity.

[0128] The apparatus provided in this specific embodiment is characterized in that,

[0129] The control module (5) includes a latch position detection unit (52) which is electrically connected to a latch sensing element (16) installed in the lock mechanism (50). The control module (5) includes a cover plate position detection unit (53) which is electrically connected to a cover plate sensing element (17) installed on the side of the cover plate (2) that does not move with the cover plate (2).

[0130] The control module (5) includes a digital processing unit (55) that is electrically connected to the latch position detection unit (52) and the cover plate position detection unit (53);

[0131] The operation performed by the control module (5) to confirm that the cover is in the open state specifically includes:

[0132] The digital processing unit (55) reads the output of the bolt position sensor through the bolt position detection unit (52), and uses the read bolt position sensor output signal to confirm that the bolt has moved out of the lock slot; then, the digital processing unit (55) reads the output signal of the cover plate position sensor through the cover plate position detection unit (53), and makes the following judgment:

[0133] If the output signal level of the cover plate position detection unit (53) is the level L2 corresponding to the cover plate being in the open position, then it is confirmed that the cover plate is in the open state;

[0134] If the output signal level of the cover plate position detection unit (53) is the level L1 corresponding to the cover plate being in the locked position, then it is confirmed that the cover plate is in the locked state.

[0135] The cover plate position detection unit (53) performs anti-interference or de-jitter processing on the output signal of the cover plate position sensor;

[0136] The latch position detection unit (52) performs anti-interference or de-jitter processing on the output signal of the latch position sensor.

[0137] See Figure 2As shown, the latch position sensor includes a latch magnet (15) and a latch sensing element (16), wherein the latch sensing element (16) is a Hall element; specifically, the latch sensing element (16) is a Hall switch; the latch magnet (15) is mounted on the latch (12) and moves with the latch (12), while the latch sensing element (16) is mounted on the latch slide rail or the latch bracket and does not move.

[0138] The cover plate position sensor includes a cover plate magnet (23) and a cover plate sensing element (17), wherein the cover plate sensing element (17) is a Hall element; specifically, the cover plate sensing element (17) is a Hall switch; the cover plate magnet (23) is mounted on the cover plate (2) and moves with the cover plate (2), while the cover plate sensing element (17) is mounted on the lock box and does not move.

[0139] The operation of using the output signal of the bolt position sensor to confirm that the bolt has moved out of the bolt slot specifically includes:

[0140] Read the output of the latch sensing element (16). If the output of the latch sensing element (16) is high, it is confirmed that the latch is in the state of being removed from the lock slot; or

[0141] Read the output of the latch sensing element (16). If the output of the latch sensing element (16) is low, it is confirmed that the latch is in the state of being removed from the lock slot.

[0142] Whether a high-level or low-level signal is used to determine if the bolt is out of the lock slot depends on the preset level or the type of Hall switch used.

[0143] In the step of confirming that the cover plate (2) is in the open state, the output signal level of the cover plate position sensor is the output level of the cover plate sensing element (17), specifically the output level of the Hall switch. The output level of the Hall switch corresponding to the open position of the cover plate (2) is represented as level L2, and level L2 is predetermined to be the low level output by the Hall switch. In other words, the cover plate is confirmed to be in the open state when the output level of the Hall switch is low.

[0144] In the step of confirming that the cover plate (2) is in the open state, the output signal level of the cover plate position sensor is the output level of the cover plate sensing element (17), specifically the output level of the Hall switch. When the cover plate (2) is in the locked position, the output level of the Hall switch is represented as level L1, and level L1 is predetermined to be the high level output of the Hall switch, or in other words, the cover plate is confirmed to be in the locked state when the output level of the Hall switch is high.

[0145] The apparatus provided in this specific embodiment is characterized in that,

[0146] The digital processing unit (55) is electrically connected to the audio unit (54);

[0147] After confirming that the cover is in an abnormally locked state, the digital processing unit (55) performs the following operations:

[0148] Stop driving the bolt (12) into the locked position;

[0149] The control audio unit (54) issues a voice or sound prompt indicating that the cover (2) is in an abnormally locked state; and / or

[0150] The control audio unit (54) provides instructions via voice on how to open the cover using manual intervention.

[0151] Specifically, after confirming that the cover plate is locked when the latch is already out of the lock groove, it is determined that the cover plate (2) is abnormally opened.

[0152] Furthermore, in order to implement subsequent manual unlocking, a prompt is issued by voice or sound indicating that the cover (2) has failed to enter the open state.

[0153] Specifically, see Figure 5 As shown, the control module (5) includes an audio unit (54) that provides instructions on how to open the cover by manual intervention in a voice manner, including providing the phone number to be dialed or providing instructions on how to push, pull, squeeze or pry a specific component manually.

[0154] The apparatus provided in this specific embodiment is characterized in that,

[0155] The digital processing unit (55) and the communication unit (56) are electrically connected;

[0156] After confirming that the cover is in an abnormally locked state, the digital processing unit (55) performs the following operations:

[0157] Stop driving the bolt (12) into the locked position;

[0158] The control communication unit (56) establishes a communication connection with the smartphone;

[0159] The communication unit (56) establishes a communication connection with the smartphone, sends the cover plate abnormal locking information to the smartphone, and outlines the steps to remove the cover plate abnormal locking.

[0160] The specific steps of the method described in this utility model are executed by the control module (5), see [link to relevant documentation]. Figure 5As shown, the control module (5) includes a motor drive unit (51), a latch position detection unit (52), a cover plate position detection unit (53), an audio unit (54), a digital processing unit (55), and a communication unit (56); the motor drive unit (51) includes a DC switch circuit for controlling the start and stop of the motor, and controls the DC motor that drives the cam (18) to rotate; the latch position detection unit (52) includes a latch position sensor, see Figure 2 As shown, the latch position sensor includes a latch magnet (15) and a latch sensing element (16), wherein the latch sensing element (16) is a Hall element; specifically, the latch sensing element (16) is a Hall switch; the cover plate position detection unit (53) includes a cover plate position sensor, see Figure 2 As shown, the cover plate position sensor includes a cover plate magnet (23) and a cover plate sensing element (17), wherein the cover plate sensing element (17) is a Hall element; the digital processing unit (55) includes a digital processor circuit, the digital processing unit (55) uses the position information provided by the latch position detection unit (52) to determine the position of the latch (12), the digital processing unit (55) uses the position information provided by the cover plate position detection unit (53) to determine the position of the cover plate (2), and the digital processing unit (55) controls the rotation of the motor through the motor drive unit (51), thereby controlling the position of the latch (12).

[0161] The control module (5) uses its included communication unit (56) to receive unlocking commands. The communication unit (56) includes a wireless communication module, such as Bluetooth or WIFI, to transmit the unlocking control commands.

[0162] Locking mechanism (50), see Figure 2 and Figure 5 As shown, it includes a latch (12), a cam (18), a latch spring (13) and a bracket. The bracket includes a slide groove and provides mounting support for the latch (12), the cam (18) and the latch spring (13). The latch (12) is a component with a through hole. The cam (18) is located in the through hole. The latch spring (13) is provided on the left side of the latch.

[0163] The cam (18) is mounted on the cam shaft (14), which is driven by a DC motor and controlled by a motor drive module (52).

[0164] In the method described in this specific embodiment, see [link to relevant documentation]. Figure 5 As shown, the control module (5), the locking mechanism (50) and the cover plate (2) are all installed on the manhole cover (6), with the manhole cover (6) serving as its installation support; or, in other words, the control module (5), the locking mechanism (50) and the cover plate (2) are components of the manhole cover (6).

[0165] The device described in this invention overcomes at least one of the shortcomings of existing manhole cover unlocking technologies, such as complex unlocking and locking structures of the cover plate and inability to identify and assist in eliminating cover plate jamming faults during unlocking. It has a simple structure, can identify and assist in eliminating cover plate jamming faults during unlocking, and is easy to operate, install, and maintain.

Claims

1. A cover plate unlocking device, comprising a locking mechanism (50), a control module (5), and a cover plate (2); characterized in that, The locking mechanism (50) for unlocking and locking the cover plate (2) includes a latch (12), a cam (18), a latch spring (13) and a DC motor for driving the cam (18); The control module (5) is used to perform the following control operations on the lock mechanism (50): Rotate the cam so that its centroid changes from pointing in the direction of bolt retraction to pointing in the direction of bolt extension, thereby using the bolt spring to push the bolt along the slide and extend it out of the bolt cavity; and / or Rotate the cam so that the cam's centroid changes from pointing towards the direction of the bolt extension to pointing towards the direction of the bolt retraction. Use the cam's convex surface to push the bolt along the slide and move it out of the lock groove on the cover plate. It includes a motor drive unit (51), a bolt position detection unit (52), a cover plate position detection unit (53), a digital processing unit (55), and a communication unit (56). Cover plate (2) is used to press the bolt into the tongue cavity by the locking groove lip on the cover plate, and then the bolt enters the locking groove on the cover plate under the push of the spring; including locking groove (21). The cam's telecentric point is the point on the cam's cam surface that is farthest from the cam's axis of rotation.

2. The cover plate unlocking device according to claim 1, characterized in that, The motor drive unit (51) included in the control module (5) is electrically connected to the DC motor included in the lock mechanism (50), and the DC motor drives the cam (18) to rotate through the cam shaft (14); Before the control module (5) performs the operation of rotating the cam so that the cam's centroid changes from pointing towards the retraction of the latch to pointing towards the extension of the latch, and using the latch spring to push the latch along the slide and extend out of the tongue cavity, it uses its included cover plate position detection unit (53) and digital processing unit (55) to perform the operation of confirming that the cover plate is in the open state.

3. The cover plate unlocking device according to claim 2, characterized in that, The control module (5) includes a latch position detection unit (52) which is electrically connected to a latch sensing element (16) installed in the lock mechanism (50). The control module (5) includes a cover plate position detection unit (53) which is electrically connected to a cover plate sensing element (17) installed on the side of the cover plate (2) that does not move with the cover plate (2). The control module (5) includes a digital processing unit (55) that is electrically connected to the latch position detection unit (52) and the cover plate position detection unit (53); The operation performed by the control module (5) to confirm that the cover is in the open state specifically includes: The digital processing unit (55) reads the output of the bolt position sensor through the bolt position detection unit (52), and uses the read bolt position sensor output signal to confirm that the bolt has moved out of the lock slot; then, the digital processing unit (55) reads the output signal of the cover plate position sensor through the cover plate position detection unit (53), and makes the following judgment: If the output signal level of the cover plate position detection unit (53) is the level L2 corresponding to the cover plate being in the open position, then it is confirmed that the cover plate is in the open state; If the output signal level of the cover plate position detection unit (53) is the level L1 corresponding to the cover plate being in the locked position, then it is confirmed that the cover plate is in the locked state.

4. The cover plate unlocking device according to claim 3, characterized in that, The digital processing unit (55) is electrically connected to the audio unit (54); After confirming that the cover is in an abnormally locked state, the digital processing unit (55) performs the following operations: Stop driving the bolt (12) into the locked position; The control audio unit (54) issues a voice or sound prompt indicating that the cover (2) is in an abnormally locked state; and / or The control audio unit (54) provides instructions via voice on how to open the cover using manual intervention.

5. The cover plate unlocking device according to claim 3, characterized in that, The digital processing unit (55) and the communication unit (56) are electrically connected; After confirming that the cover is in an abnormally locked state, the digital processing unit (55) performs the following operations: Stop driving the bolt (12) into the locked position; The control communication unit (56) establishes a communication connection with the smartphone; The communication unit (56) establishes a communication connection with the smartphone, sends the cover plate abnormal locking information to the smartphone, and outlines the steps to remove the cover plate abnormal locking.

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