A theft-proof device for a manhole cover

Abstract

The utility model discloses a kind of well lid anti-theft devices, including the well lid body being set in ground base, the rotating disc being set in the bottom of well lid body by rotating shaft, the rotating disc is coaxially arranged with well lid body, a plurality of circumferential equidistance distribution's locking assembly is connected on the rotating disc, the locking assembly includes the connecting rod being rotatably connected with rotating disc and the insertion rod being rotatably connected with the end of connecting rod, the locking assembly further includes the guide piece being fixedly connected to the bottom of well lid body.In the utility model, after well lid body is accurately placed inside ground base, make that indication line one is aligned with indication line two, then remote start motor, drive rotating disc rotation, rotating disc drives multiple connecting rods to move simultaneously, connecting rod drives corresponding insertion rod linear displacement, so that insertion rod end is inserted to the inside of spout, realize the fixed installation of well lid body and ground base, well lid body and ground base are firmly fixed, cannot be pried or pulled apart by external force by crowbar, i.

Description

Technical Field

[0001] This utility model relates to the field of manhole cover technology, specifically to a manhole cover anti-theft device. Background Technology

[0002] Manhole covers are components that cover the openings of underground pipelines (such as rainwater wells, cable wells, gas wells, etc.). The main body of the manhole cover directly bears the ground load (pedestrians and vehicles running over it), and must have sufficient strength and durability. The shape is mainly circular (for even stress distribution and to prevent it from falling off). Square or irregular designs are used in some special scenarios (such as the edge of sidewalks and areas with dense pipelines). The main functions are to prevent pedestrians and vehicles from falling into underground manholes, which is the most basic safety function of manhole covers: preventing intrusion; preventing debris (such as garbage and mud) and rainwater from entering underground pipelines, thus preventing pipeline blockage (e.g., rainwater well covers can filter fallen leaves to prevent blockage of drainage pipes) and equipment damage (e.g., power well covers prevent rainwater from entering and prevent short circuits).

[0003] Traditional manhole covers lack protective structures, are easily pried open, and rely solely on their own weight (20-40kg) to cover the manhole base. They lack interlocking mechanisms, locks, and hinges. Thieves can easily pry open the cover using a crowbar inserted into the gap between the cover and the base, leveraging the principle of leverage. If a single stolen manhole cover is not detected promptly, it may only create a "manhole hazard" in the short term (rather than immediately causing an accident), and the theft causes economic losses to municipal departments. Therefore, a solution is urgently needed. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] In view of the shortcomings of the existing technology, this utility model provides a manhole cover anti-theft device, which solves the problems mentioned in the background art.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: a manhole cover anti-theft device, comprising a manhole cover body disposed in the foundation, a turntable rotatably disposed at the bottom of the manhole cover body via a rotating shaft, the turntable being coaxially disposed with the manhole cover body, and a plurality of locking components evenly distributed around the circumference connected to the turntable, each locking component comprising a connecting rod rotatably connected to the turntable and an insert rod rotatably connected to the end of the connecting rod, the locking component further comprising a guide member fixedly connected to the bottom of the manhole cover body, the guide member being generally U-shaped, and the insert rod being movably inserted into the guide member.

[0008] Preferably, the insertion rod is a rectangular rod, and the guide has a rectangular limiting opening, which is used to guide the insertion rod in a straight line.

[0009] Preferably, a bracket is fixedly connected to the bottom of the manhole cover body, and a motor is fixedly installed at the end of the bracket, with the output end of the motor being coaxially and fixedly connected to the turntable.

[0010] Preferably, the inner wall of the foundation has circumferentially distributed insertion slots, and when the manhole cover body is fixedly installed on the foundation, the end of the insertion rod is inserted into the insertion slot.

[0011] Preferably, the edge of the manhole cover body is provided with a plurality of circumferentially distributed indicator lines I, and the inner wall of the foundation is provided with a plurality of circumferentially distributed indicator lines II, wherein the positions of the indicator lines I and the indicator lines II correspond one-to-one.

[0012] Preferably, the surface of the manhole cover body has two symmetrically distributed through holes, which are symmetrically distributed about the axis of the manhole cover body.

[0013] (III) Beneficial Effects

[0014] This utility model provides an anti-theft device for manhole covers, which has the following beneficial effects:

[0015] 1. In this utility model, after the manhole cover body is accurately placed inside the foundation, the indicator line one and the indicator line two are aligned. Then, the motor is remotely started to drive the turntable to rotate. The turntable drives multiple connecting rods to move simultaneously. The connecting rods drive the corresponding insertion rods to move linearly, so that the end of the insertion rod is inserted into the insertion port, realizing the fixed installation of the manhole cover body and the foundation. The manhole cover body and the foundation are firmly fixed and cannot be pried off by a crowbar or pulled off by external force. This prevents thieves from stealing the manhole cover body, avoids economic losses to the municipal department, and also avoids the "manhole opening hazard" that may form in the short term.

[0016] 2. In this utility model, a dedicated wireless remote control switch for the motor is used, consisting of a remote control and a receiver. The receiver is connected to the motor's control circuit. The remote control sends signals, and the receiver receives the signals and controls the start and stop of the motor. Attached Figure Description

[0017] Figure 1 This is a front-view perspective view of a manhole cover anti-theft device proposed in this utility model;

[0018] Figure 2 This is a bottom-view perspective view of a manhole cover anti-theft device proposed in this utility model;

[0019] Figure 3 This is a structural diagram showing the installation state of an anti-theft device for manhole covers proposed in this utility model;

[0020] Figure 4 for Figure 3 A diagram of the structure viewed from below;

[0021] Figure 5 for Figure 4 Enlarged structural diagram at point A;

[0022] Figure 6 This is a foundation structure diagram of a manhole cover anti-theft device proposed in this utility model.

[0023] In the diagram: 1. Manhole cover body; 101. Indicator line one; 102. Through hole; 2. Turntable; 3. Connecting rod; 4. Insert rod; 5. Guide component; 6. Motor; 7. Support; 8. Foundation; 801. Insertion port; 802. Indicator line two; 9. Rotating shaft. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0025] Please see Figures 1 to 5 This utility model provides a technical solution: a manhole cover anti-theft device, including a manhole cover body 1 set in the foundation 8, a turntable 2 rotatably set at the bottom of the manhole cover body 1 via a rotating shaft 9, the turntable 2 being coaxially set with the manhole cover body 1, and a plurality of locking components distributed equidistantly around the circumference connected to the turntable 2, the locking components including a connecting rod 3 rotatably connected to the turntable 2 and an insert rod 4 rotatably connected to the end of the connecting rod 3, the locking components also including a guide 5 fixedly connected to the bottom of the manhole cover body 1, the guide 5 being U-shaped in general, and the insert rod 4 being movably inserted into the guide 5.

[0026] See Figure 5 and 6 The inner wall of the foundation 8 has circumferentially distributed insertion slots 801. When the manhole cover body 1 is fixedly installed on the foundation 8, the end of the insertion rod 4 is inserted into the insertion slot 801. The "fixed constraint force" on the manhole cover body 1 will be evenly distributed along the circumference. The pull-out force and pry force borne by each insertion rod 4 are basically the same, avoiding excessive local force due to "single point or asymmetric locking". After the insertion rod 4 is inserted into the insertion slot 801, the manhole cover body 1 and the foundation 8 form a "rigid connection". When the insertion rod 4 is retracted without the motor 6 driving it, the end of the insertion rod 4 is tightly engaged with the inner wall of the insertion slot 801. Thieves cannot make the insertion rod 4 disengage from the insertion slot 801 by "prying, cutting, or knocking".

[0027] After accurately placing the manhole cover body 1 inside the foundation 8, the insertion rod 4 and the insertion port 801 are aligned. Then, the motor 6 is remotely started, driving the turntable 2 to rotate at a certain angle. The turntable 2 drives multiple connecting rods 3 to move simultaneously. The connecting rods 3 drive the corresponding insertion rod 4 to move linearly, i.e., the displacement is fixed, so that the end of the insertion rod 4 is inserted into the insertion port 801, realizing the fixed installation of the manhole cover body 1 and the foundation 8. The manhole cover body 1 and the foundation 8 are firmly fixed and cannot be pried off by a crowbar or pulled off by external force. This prevents thieves from stealing the manhole cover body 1, avoids economic losses to the municipal department, and also avoids the "manhole opening hazard" that may form in the short term.

[0028] A dedicated wireless remote control switch for the motor is used, consisting of a remote controller and a receiver. The receiver is connected to the control circuit of motor 6. The remote controller sends signals, and the receiver receives the signals and controls the start and stop of motor 6. This control method is existing technology and will not be described in detail.

[0029] When it is necessary to disassemble the manhole cover body 1, the motor 6 needs to be rotated in reverse so that the insertion rod 4 is moved out of the insertion port 801. Then, the manhole cover body 1 is lifted by a tool and moved out of the foundation 8. The above-mentioned driving process of the motor 6 is existing technology and is the reverse process during installation, so it will not be described in detail.

[0030] See Figures 1 to 5 The insertion rod 4 is a rectangular rod, and the guide 5 has a rectangular limiting port, which is used to guide the insertion rod 4 in a straight line.

[0031] When the rectangular insertion rod 4 is engaged with the rectangular limiting port of the guide 5, the "planar constraint" of the rectangle can completely block the rotational freedom of the insertion rod 4, ensuring that the end of the insertion rod 4 always maintains coaxiality with the insertion port 801, and avoiding insertion jamming caused by rotation; designing the insertion rod 4 as a rectangular rod and achieving linear guidance through the rectangular limiting port of the guide 5 is an important optimization of the "transmission accuracy and structural stability" of the manhole cover anti-theft fixing system.

[0032] See Figures 1 to 5 The bottom of the manhole cover body 1 is fixedly connected to a bracket 7, and a motor 6 is fixedly installed at the end of the bracket 7. The output end of the motor 6 is coaxially fixedly connected to the turntable 2.

[0033] The motor 6 is started by remote control, which drives the turntable 2 to rotate. The turntable 2 drives multiple connecting rods 3 to move simultaneously. The connecting rods 3 drive the corresponding insertion rods 4 to move linearly, so that the end of the insertion rod 4 is inserted into the insertion port 801, thereby achieving the purpose of locking and installing the manhole cover body 1.

[0034] See Figures 1 to 3Multiple circumferentially distributed indicator lines 101 are provided at the edge of the manhole cover body 1, and multiple circumferentially distributed indicator lines 802 are provided on the inner wall of the foundation 8. The positions of indicator lines 101 and indicator lines 802 correspond one-to-one.

[0035] The position of indicator line 101 corresponds to the position of the insertion rod 4. That is, when the position of indicator line 101 coincides with the position of indicator line 802, it indicates that the position of insertion rod 4 corresponds to the position of insertion port 801, which facilitates the subsequent linear displacement of insertion rod 4 and ensures that the end of insertion rod 4 is accurately inserted into insertion port 801.

[0036] See Figures 1 to 5 The surface of the manhole cover body 1 has two symmetrically distributed through holes 102, which are symmetrically distributed about the axis of the manhole cover body 1.

[0037] Traditional heavy-duty manhole covers require a pry bar inserted into the gap to pry them open. The symmetrical through holes 102 can directly serve as the "opening leverage point"—workers insert specialized opening tools (such as U-hooks or pin-type wrenches) into the two through holes 102, and by applying symmetrical force (using both hands or tools simultaneously), the manhole cover body 1 can be easily lifted upwards. Furthermore, the two through holes 102, symmetrically distributed along the axis on the surface of the manhole cover body 1, not only serve as "auxiliary opening" holes but also function as "drainage holes," forming a "dual-purpose" design logic.

[0038] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A manhole cover anti-theft device, characterized in that: The manhole cover body (1) is set in the foundation (8) and a turntable (2) is rotatably set at the bottom of the manhole cover body (1) via a rotating shaft (9). The turntable (2) is coaxially set with the manhole cover body (1). Multiple locking components are connected to the turntable (2) at equal intervals around the circumference. The locking components include a connecting rod (3) rotatably connected to the turntable (2) and an insert rod (4) rotatably connected to the end of the connecting rod (3). The locking components also include a guide (5) fixedly connected to the bottom of the manhole cover body (1). The guide (5) is U-shaped in general. The insert rod (4) is movably inserted into the guide (5).

2. A theft deterrent device for a manhole cover as defined in claim 1, wherein: The insertion rod (4) is a rectangular rod, and the guide (5) has a rectangular limiting opening, which is used to guide the insertion rod (4) in a straight line.

3. The anti-theft device for manhole covers according to claim 1, characterized in that: The bottom of the manhole cover body (1) is fixedly connected to a bracket (7), and a motor (6) is fixedly installed at the end of the bracket (7). The output end of the motor (6) is coaxially fixedly connected to the turntable (2).

4. The theft preventing device for a manhole cover according to claim 1, wherein: The inner wall of the foundation (8) is provided with circumferentially distributed insertion slots (801). When the manhole cover body (1) is fixedly installed on the foundation (8), the end of the insertion rod (4) is inserted into the insertion slot (801).

5. The theft preventing device for a manhole cover according to claim 1, wherein: The edge of the manhole cover body (1) is provided with multiple circumferentially distributed indicator lines (101), and the inner wall of the foundation (8) is provided with multiple circumferentially distributed indicator lines (802). The positions of the indicator lines (101) and the indicator lines (802) correspond one-to-one.

6. The anti-theft device for manhole covers according to claim 1, characterized in that: The surface of the manhole cover body (1) is provided with two symmetrically distributed through holes (102), which are symmetrically distributed about the axis of the manhole cover body (1).

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