A cable theft prevention device for a construction site

Abstract

This application provides a cable anti-theft device for construction sites, comprising: a transmitting module; and a receiving module, which, along with the transmitting module, is respectively disposed within cable end caps at both ends of the cable and connected to the same conductor within the cable via conductive connectors to form an electrical signal path. The receiving module includes a loop detection unit and an alarm unit for signal connection. The loop detection unit detects the continuity of the electrical signal path; the alarm unit triggers a first alarm upon interruption of the electrical signal path. This device, through the transmitting and receiving modules and the conductive connectors, forms an electrical signal path with the same conductor within the cable. The formation of this path is independent of whether the cable is energized; even if the cable is not energized, as long as the conductor is intact, the electrical signal path remains unobstructed. When the cable is cut, the conductor breaks, and the electrical signal path is interrupted. The loop detection unit detects this promptly, and the alarm unit issues an alarm, thus solving the problem of dependence on the cable being energized.

Description

Technical Field

[0001] This application relates to the field of cable anti-theft technology, and in particular to a cable anti-theft device for use on construction sites. Background Technology

[0002] In construction projects, power line installations, and various infrastructure projects, large quantities of cables are often temporarily stored at open-air construction sites or in makeshift warehouses. These locations have complex environments, high personnel turnover, and weak physical security, making them easy targets for theft, resulting in significant property losses and project delays. Cable theft primarily occurs in two typical ways, and existing protective measures are significantly inadequate in addressing these issues: The problem of "cut-and-steal" refers to partial theft, where thieves use specialized tools to directly cut the cable and steal the valuable section. Traditional security measures such as ordinary locks, wire bindings, or simple fencing are almost ineffective against this. Although surveillance cameras may be deployed on-site, their role is mostly retrospective, and they are unlikely to trigger effective deterrence or real-time alarms the moment the theft occurs. Chinese patent CN206292935U discloses an external cable concealment anti-theft real-time alarm device, which relies on the cable's energized status for current monitoring or requires fixed installation inside a utility pole box, and is only applicable to working cables. For idle cables, no current flows, and the storage location changes dynamically, rendering this solution completely ineffective.

[0003] The problem of "whole-section theft" refers to the act of moving cables as a whole. Thieves take advantage of the cable's rolling ability or use small vehicles to quickly drag the entire reel of cable away from the site. This type of theft is often targeted and carried out swiftly. Existing protective methods, such as welding the cable reel to the ground or using heavy-duty anchoring devices, are somewhat effective, but they are costly, lack flexibility, and are difficult to adapt to the frequent movement of equipment at construction sites.

[0004] Therefore, there is an urgent need to design an anti-theft device that can accurately detect and issue a strong on-site deterrent at the first moment of theft, and simultaneously transmit precise location information and on-site conditions remotely to management personnel to achieve rapid response and tracking, thereby effectively curbing cable theft and ensuring the safety of construction materials. Utility Model Content

[0005] This application provides a cable anti-theft device for construction sites to solve the problem that existing anti-theft devices rely on the energized state of cables and cannot monitor idle cables that are not energized, thus failing to detect when cables are cut in a timely manner.

[0006] A cable anti-theft device for construction sites is provided, comprising: a transmitting module; a receiving module, which is respectively disposed in the cable end caps at both ends of the cable and connected to the same conductor in the cable through conductive connectors to form an electrical signal path; the receiving module includes a loop detection unit and an alarm unit for signal connection; the loop detection unit is used to detect the continuity of the electrical signal path; the alarm unit is used to trigger a first alarm after the electrical signal path is broken.

[0007] In some embodiments, the transmitting module and the receiving module are respectively built into the housing; the housing is located at the bottom inside the cable end cap, and the diameter of the housing is not greater than the diameter of the cable end cap.

[0008] In some embodiments, the conductive connector includes a wire and an insertable conductive needle; one end of the wire is connected to the button-like structure, and the other end is provided with an insertable conductive needle connected to the conductor.

[0009] In some embodiments, the length of the conductor is greater than the length of the cable end cap.

[0010] In some embodiments, a seal is also included; the seal is detachably disposed between the cable end cap and the outer wall of the cable.

[0011] In some embodiments, both the transmitting module and the receiving module are provided with conductive connectors of the same number as the conductors inside the cable. Each conductive connector on the transmitting module and the receiving module is connected to one conductor to form multiple electrical signal paths; the alarm unit is used to trigger a first alarm after all multiple electrical signal paths are broken.

[0012] In some embodiments, the receiving module is equipped with a conductor detection lamp; the conductor detection lamp is connected to the loop detection unit; the conductor detection lamp is used to switch on and off according to the on / off state of the electrical signal path.

[0013] In some embodiments, a displacement detection unit is also included, which is located in the receiving module, for acquiring the distance the cable has moved; an alarm unit is connected to the displacement detection unit for triggering a second alarm when the distance the cable has moved is detected to be greater than a first standard distance.

[0014] In some embodiments, both the transmitting module and the receiving module are provided with a power supply unit; the power supply unit includes a lithium battery; both the transmitting module and the receiving module are provided with a magnetic charging interface for charging the lithium battery.

[0015] In some embodiments, a sound transmission unit and a positioning unit are also included, both of which are located within the receiving module; the positioning unit is used to obtain the position of the receiving module in real time; and the sound transmission unit is used to record the sound around the receiving module in real time.

[0016] The beneficial effects of the technical solution provided in this application include: This application provides a cable anti-theft device for construction sites. The device, through a transmitting module and a receiving module, connects to the same conductor within the cable via conductive connectors to form an electrical signal path. The formation and maintenance of this path are independent of whether the cable is energized. Even if the cable is idle and not energized, the electrical signal path remains unobstructed as long as the conductor is intact. When the cable is cut, the conductor breaks, and the electrical signal path is interrupted. The loop detection unit of the receiving module can detect this, solving the problem of existing anti-theft devices relying on the cable's energized state. For idle cables not energized, the device itself forms an independent electrical signal path, and the loop detection unit can continuously monitor the path's continuity. Once the cable is cut and the path is broken, the loop detection unit immediately detects it, triggering the alarm unit to issue the first alarm. This ensures timely detection when the cable is cut, solving the problems of not being able to monitor idle cables not energized and not being able to detect cable cuts in a timely manner. No longer limited by whether the cable is energized or not, this device can monitor both energized cables in use and idle cables that are not energized in storage, greatly improving the device's practicality and meeting the anti-theft needs of cables in different states at construction sites. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 Schematic diagrams of the relevant structures of the cable, cable end cap, and cable anti-theft device provided in the embodiments of this application; Figure 2 A schematic diagram of the cable cross-section provided in the embodiments of this application; Figure 3 This is a schematic diagram of a cable anti-theft device provided in an embodiment of this application.

[0019] In the diagram: 1. Transmitting module; 2. Receiving module; 3. Cable; 4. Cable end cap; 5. Conductive connector; 51. Wire; 52. Penetrating conductive needle; 6. Conductor. Detailed Implementation

[0020] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0021] To make the technical problem that this application aims to solve clearer, the causes of the technical problem will be analyzed in detail below.

[0022] Traditional surveillance cameras and similar devices are primarily used for post-incident tracing and cannot effectively deter or provide real-time alarms the moment theft occurs, making it difficult to stop theft in a timely manner. Some existing anti-theft devices rely on the energized state of the cable 3 to monitor current, or require fixed installation in a specific location, and are only applicable to working cables 3. However, idle cables 3 at construction sites have no current flowing through them, and their storage locations change dynamically, rendering such devices completely ineffective. Cables stored in reels have the characteristic of being able to roll, which thieves can exploit or use small vehicles to quickly drag the entire reel of cable 3 away from the site, making the theft swift. Existing protection methods are costly and lack flexibility, making it difficult to adapt to the frequent movement of equipment at construction sites and unable to effectively counter theft methods that involve stealing entire sections of cable 3.

[0023] In summary, due to the dependence on the energized state of the cable 3, the limitations of the installation location, and the high cost and low flexibility of the protection methods, the existing technology is unable to provide effective anti-theft protection for the cable 3 at the construction site, especially the idle cable 3 that is not energized, resulting in frequent cable theft problems.

[0024] This application provides a cable anti-theft device for construction sites, referring to... Figures 1-3 , Figure 1 The diagram shows the relevant structures of the cable 3, cable end cap 4, and cable anti-theft device provided in the embodiments of this application. Figure 1 As shown, a cable anti-theft device for construction sites includes: a transmitting module 1 and a receiving module 2, which are respectively located in the cable end caps 4 at both ends of the cable 3 and connected to the same conductor 6 in the cable 3 through conductive connectors 5 to form an electrical signal path; the receiving module 2 includes a circuit detection unit and an alarm unit for signal connection; the circuit detection unit is used to detect the continuity of the electrical signal path; the alarm unit is used to trigger a first alarm after the electrical signal path is broken.

[0025] By configuring this device, a signal path is formed by connecting the transmitting module 1 and the receiving module 2 to the same conductor 6 within the cable 3 via a conductive connector 5. The formation and maintenance of this path are independent of whether the cable 3 is energized. Even if the cable 3 is in an idle state without power, the signal path remains unobstructed as long as the conductor 6 is intact. When the cable 3 is cut, the conductor 6 breaks, and the signal path is interrupted. The loop detection unit of the receiving module 2 can detect this, solving the problem in existing anti-theft devices that rely on the energized state of the cable 3. For idle cables 3 without power, since the device itself forms an independent signal path, the loop detection unit can continuously monitor the continuity of the path. Once the cable 3 is cut, the path is interrupted, and the loop detection unit immediately detects this, triggering the alarm unit to issue the first alarm. This ensures timely detection when the cable 3 is cut, solving the problems of not being able to monitor idle cables 3 without power and not being able to detect when the cable 3 is cut in time. No longer restricted by whether cable 3 is energized, this device can monitor both energized cable 3 in use and unenergized cable 3 stored in storage, greatly improving the device's practicality and meeting the anti-theft needs of cable 3 in different states at the construction site.

[0026] In some preferred embodiments, the transmitting module 1 and the receiving module 2 are respectively built into the housing; the housing is located at the bottom inside the cable end cap 4, and the diameter of the housing is not greater than the diameter of the cable end cap 4.

[0027] In this embodiment, the housing adopts a button-shaped structure, the diameter of which does not exceed the diameter of the cable end cap 4, and it can be detachably installed inside the cable end cap 4, achieving concealed deployment of the device. This design makes it difficult for thieves to detect the device's presence during theft, preventing targeted damage and ensuring the continuous effectiveness of the anti-theft monitoring function. Simultaneously, its detachable nature adapts to the frequent movement of cables at construction sites, eliminating the need for permanent modifications to the cable 3 or cable end cap 4. Installation and disassembly are convenient, flexibly adapting to dynamic changes in the storage location of the cable 3. Compared to traditional external devices, this structure does not affect the normal storage and handling of the cable 3, and remains concealed before theft occurs, laying the foundation for subsequent alarm triggering and deterrence, significantly improving the protection against localized theft of the cable 3.

[0028] In some preferred embodiments, the conductive connector 5 includes a wire 51 and an insertable conductive needle 52; one end of the wire 51 is connected to a button-like structure, and the other end is provided with an insertable conductive needle 52 connected to the conductor 6.

[0029] In this embodiment, the piercing conductive needle 52 can directly penetrate the outer insulation of the cable 3 and form a connection with the inner conductor 6, ensuring stable contact between the wire 51 and the conductor 6. This connection method is unaffected by whether the cable 3 is energized or not. Even when the cable 3 is idle, the mechanical insertion of the piercing conductive needle 52 can ensure a smooth electrical signal path, guaranteeing continuous and stable signal generation. Simultaneously, the piercing design makes it less prone to detachment due to slight movement or impact of the cable 3, reducing false alarms caused by loose connections and improving monitoring accuracy. Furthermore, this structure is simple to operate, requiring no specialized tools for connection, adapting to the need for rapid deployment on construction sites and further enhancing the device's practicality. Most importantly, it facilitates the connection of the transmitting module 1 and the receiving module 2 to the cable 3.

[0030] In some preferred embodiments, the length of conductor 51 is greater than the length of cable end cap 4.

[0031] In this embodiment, the length of the conductor 51 is greater than the length of the cable end cap 4, providing sufficient redundancy for the conductor 51. This avoids problems such as breakage or connection detachment due to insufficient length during installation, ensuring stable circuit closure during the installation phase. Most importantly, it facilitates the connection of the conductor 51 to the inner conductor 6 of the cable 3. Before installing the cable end cap 4, the cable end cap 4 is brought close to the end of the cable 3, and the conductor 51 is gently removed from the cable end cap 4 and inserted into the corresponding conductor 6. This avoids inconvenience in connecting the conductor 51 to the conductor 6 after the cable end cap 4 is installed. The redundancy also provides buffer space for installation errors of the cable end cap 4 and subsequent minor displacements, reducing damage to the conductor 51 or loosening of the connection due to mechanical stress, and lowering the probability of false alarms. Simultaneously, the sufficient length of the conductor 51 allows operators to adjust the connection position during deployment, ensuring optimal insertion into the conductor 6 and improving the reliability of the circuit connection.

[0032] In some preferred embodiments, a seal is also included; the seal is detachably disposed between the cable end cap 4 and the outer wall of the cable 3.

[0033] In this embodiment, the sealing element effectively seals the gap between the cable end cap 4 and the outer wall of the cable 3, preventing rainwater, dust, and other impurities from entering the cable end cap 4. This provides a good protective environment for the housing 1 and internal modules, reducing the risk of device failure due to environmental corrosion. This design extends the service life of the device, reduces maintenance frequency, and meets the long-term use requirements of harsh construction site environments.

[0034] In some preferred embodiments, both the transmitting module 1 and the receiving module 2 are provided with the same number of conductive connectors 5 as the conductors 6 inside the cable 3; the conductive connectors 5 on the transmitting module 1 and the receiving module 2 are connected to one conductor 6 respectively to form multiple electrical signal paths; the alarm unit is used to trigger a first alarm after all multiple electrical signal paths are broken.

[0035] In this embodiment, the design of multiple electrical signal paths significantly reduces the false alarm rate through a redundant monitoring mechanism. The first alarm is triggered only when all paths are open, i.e., when cable 3 is substantially severed, causing all conductors 6 to break. This avoids false alarms caused by accidental interruptions in a single path, ensuring the accuracy of the alarm. For cables 3 with multiple conductors 6, the multiple paths also adapt to the monitoring needs of different conductors 6, improving the device's compatibility with complex cable 3 structures. Furthermore, the redundant design improves system reliability, ensuring that the device can still stably identify actual theft and cutting activities even in harsh construction environments, enhancing the effectiveness of anti-theft monitoring.

[0036] In some preferred embodiments, the receiving module 2 is provided with a conductor detection lamp; the conductor detection lamp is connected to the loop detection unit; the conductor detection lamp is used to switch on and off according to the on / off state of the electrical signal path.

[0037] In this embodiment, the conductor detection light uses intuitive light signals: a lit light indicates a normal circuit, and an unlit light indicates a broken circuit, achieving visualized monitoring of the circuit status. Installers do not need specialized tools; they can confirm the connection's validity simply by observing the light, significantly simplifying the installation and commissioning process and improving deployment efficiency at the construction site. During routine maintenance, managers can quickly troubleshoot circuit faults using the lights. For example, if a light on a particular circuit is off, it indicates a problem with the corresponding connection, allowing for timely repair of hidden faults and preventing the anti-theft function from failing. For multi-circuit designs, the detection lights can be set separately for different circuits, accurately locating faulty circuits and further improving maintenance convenience. This visualized design enhances the device's usability, ensuring continuous monitoring even in complex environments, indirectly guaranteeing timely alarm triggering in the event of theft, and improving overall anti-theft reliability.

[0038] In some preferred embodiments, a displacement detection module is also included, which is located on the receiving module 2, for acquiring the moving distance of the cable 3; an alarm unit is connected to the displacement detection unit for triggering a second alarm when the moving distance of the cable 3 is detected to be greater than the first standard distance.

[0039] In this embodiment, the displacement detection unit provides a new triggering condition for the alarm unit by sensing abnormal movement of the cable 3, such as being dragged or carried. When a thief attempts to move the cable 3 as a whole, the displacement detection unit can quickly capture the abnormal movement signal and trigger a second alarm, such as a louder sound or a stronger flash. Compared to the ordinary sound and light alarm of the first alarm, the enhanced alarm is more deterrent to thieves and more likely to attract the attention of on-site personnel. At the same time, the displacement detection unit is built into the receiving module 2, which does not affect the concealment of the device and prevents it from being discovered and damaged by thieves in advance. This design enables the device to have dual monitoring capabilities for both cut theft and whole-section theft, solving the problem of the single function of traditional devices. In addition, the differentiated design of the enhanced alarm can help on-site personnel quickly determine the type of theft, whether it is partial cutting or whole-section carrying, so as to take targeted countermeasures and further improve the comprehensiveness and effectiveness of cable 3 theft prevention at the construction site. It should be noted that the displacement monitoring module generally uses an inductive displacement sensor to detect the vibration and displacement of the cable 3.

[0040] In some preferred embodiments, both the transmitting module 1 and the receiving module 2 are provided with a power supply unit; the power supply unit includes a lithium battery; both the transmitting module 1 and the receiving module 2 are provided with a magnetic charging interface for charging the lithium battery.

[0041] In this embodiment, lithium batteries are more environmentally friendly than disposable batteries and reduce long-term replacement costs, making them suitable for the high-frequency use requirements of construction sites. The magnetic charging interface eliminates the need for plugging and unplugging; simply placing the charging device close to the receiving module 2 and transmitting module 1 completes charging, simplifying operation and eliminating the inconvenience of wired charging. Simultaneously, the magnetic design provides better sealing, reducing dust and rain corrosion to the interface and improving charging reliability and power unit lifespan. This design ensures that the device can be easily recharged even with frequent movement of the cable 3, preventing anti-theft failure due to power outages and guaranteeing the continuous operation of functions such as circuit generation, alarms, and displacement detection.

[0042] In some preferred embodiments, a sound transmission unit and a positioning unit are also included, both of which are disposed within the receiving module 2; the positioning unit is used to obtain the position of the receiving module 2 in real time; and the sound transmission unit is used to record the sound around the receiving module 2 in real time.

[0043] In this embodiment, the positioning module can acquire the location of the receiving module 2 in real time, thereby reflecting the location of the cable 3. When theft occurs, managers can track the movement trajectory of the cable 3 in real time through the positioning information, quickly locate the stolen cable 3, provide accurate guidance for timely recovery, and reduce property loss. In cases where the entire stolen cable 3 is moved over a long distance, the continuous positioning function of the positioning unit can overcome the limitations of the on-site range, extend the tracking window, and increase the probability of recovery. The positioning information can also assist in analyzing the route and pattern of theft, providing data support for strengthening the protection of specific areas of the construction site, improving the level of anti-theft management in the long term, and enhancing the practical value and management efficiency of the device. The sound transmission unit can record surrounding sounds in real time, including the thief's conversations, tool operation sounds, vehicle engine sounds, etc., providing key audio evidence for post-incident investigation. This sound information can help confirm details such as the time of theft, the number of participants, and the tools used. Combined with the location data of the positioning unit, the theft process can be more comprehensively reconstructed, improving the efficiency of accountability. For monitoring blind spots or scenes with unclear images, audio recordings can serve as important supplementary evidence, enhancing the accuracy of the investigation. Meanwhile, sound recording helps distinguish false alarms, such as abnormal movement caused by wind or animal collisions, from actual theft, which is accompanied by tool sounds and human voices, making it easier for managers to optimize alarm response mechanisms. It's important to know that the sound transmission unit typically uses a microphone; the positioning unit generally uses BeiDou combined with GPS.

[0044] The beneficial effects of this utility model include: A cable anti-theft device for construction sites is provided. This device, through a transmitting module 1 and a receiving module 2, connects to the same conductor 6 within the cable 3 via a conductive connector 5 to form an electrical signal path. The formation and maintenance of this path are independent of whether the cable 3 is energized. Even when the cable 3 is idle and not energized, the electrical signal path remains unobstructed as long as conductor 6 is intact. When the cable 3 is cut, conductor 6 breaks, and the electrical signal path is interrupted. The loop detection unit of the receiving module 2 can detect this, solving the problem of existing anti-theft devices relying on the energized state of the cable 3. For idle cables 3 not energized, the device itself forms an independent electrical signal path, and the loop detection unit can continuously monitor the continuity of the path. Once the cable 3 is cut, the path is interrupted, and the loop detection unit immediately detects this, triggering the alarm unit to issue the first alarm. This ensures timely detection when the cable 3 is cut, solving the problems of not being able to monitor idle cables 3 not energized and not being able to detect cable 3 being cut in a timely manner. No longer restricted by whether cable 3 is energized, this device can monitor both energized cable 3 in use and unenergized cable 3 stored in storage, greatly improving the device's practicality and meeting the anti-theft needs of cable 3 in different states at the construction site.

[0045] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0046] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0047] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A cable anti-theft device for construction sites, characterized in that, It includes: Transmission module (1); The receiving module (2) and the transmitting module (1) are respectively located in the cable end caps (4) at both ends of the cable (3), and are respectively connected to the same conductor (6) in the cable (3) through conductive connectors (5) to form an electrical signal path; The receiving module (2) includes a loop detection unit and an alarm unit for signal connection; the loop detection unit is used to detect the continuity of the electrical signal path; the alarm unit is used to trigger a first alarm after the electrical signal path is disconnected; It also includes a displacement detection unit, which is located in the receiving module (2) to obtain the moving distance of the cable (3); The alarm unit is connected to the displacement detection unit to trigger a second alarm when the movement distance of the cable (3) is detected to be greater than the first standard distance.

2. The cable anti-theft device for construction sites as described in claim 1, characterized in that: The transmitting module (1) and the receiving module (2) are respectively built into the housing; the housing is located at the bottom inside the cable end cap (4), and the diameter of the housing is not greater than the diameter of the cable end cap (4).

3. The cable anti-theft device for construction sites as described in claim 2, characterized in that: The housing adopts a button-shaped structure; The conductive connector (5) includes a wire (51) and an insertable conductive needle (52); One end of the wire (51) is connected to the button-shaped structure, and the other end is provided with the piercing conductive needle (52) connected to the conductor (6).

4. The cable anti-theft device for construction sites as described in claim 3, characterized in that: The length of the conductor (51) is greater than the length of the cable end cap (4).

5. The cable anti-theft device for construction sites as described in claim 1, characterized in that: It also includes seals; The seal can be detachably installed between the cable end cap (4) and the outer wall of the cable (3).

6. The cable anti-theft device for construction sites as described in claim 1, characterized in that: Both the transmitting module (1) and the receiving module (2) are provided with conductive connectors (5) in the same number as the conductors (6) in the cable (3); The conductive connectors (5) on the transmitting module (1) and the receiving module (2) are respectively connected to one of the conductors (6) to form multiple electrical signal paths; the alarm unit is used to trigger a first alarm after all multiple electrical signal paths are disconnected.

7. The cable anti-theft device for construction sites as described in claim 1, characterized in that: The receiving module (2) is equipped with a conductor detection lamp; The conductor detection lamp is connected to the circuit detection unit; the conductor detection lamp is used to switch on and off according to the on / off state of the electrical signal path.

8. The cable anti-theft device for construction sites as described in claim 1, characterized in that: Both the transmitting module (1) and the receiving module (2) are equipped with power supply units; The power supply unit includes a lithium battery; both the transmitting module (1) and the receiving module (2) are provided with magnetic charging interfaces for charging the lithium battery.

9. The cable anti-theft device for construction sites as described in claim 1, characterized in that: It also includes a sound transmission unit and a positioning unit, both of which are located within the receiving module (2); the positioning unit is used to obtain the position of the receiving module (2) in real time; the sound transmission unit is used to record the sound measured around the receiving module (2) in real time.

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