A digital anti-theft needle valve

Abstract

This invention belongs to the technical field of oilfield production equipment and relates to a digital anti-theft needle valve, including a contact needle and a first micro-switch. The bottom of the contact needle is connected to the trigger end of the first micro-switch, and the upper end of the contact needle passes through a through hole. The top of the contact needle is not lower than the upper opening of the through hole. The bottom of a ball rolls around the upper surface of a step. The upper opening of the through hole is located on the rolling path of the ball. When the handwheel is rotated, causing the ball to roll along the upper surface of the step, the ball will press the top of the contact needle, causing the contact needle to slide downward and press the trigger end of the first micro-switch to issue an alarm. This invention can promptly detect theft by criminals, has a significant deterrent effect, fundamentally solves the problem of sampling valves being easily stolen, and ensures the safety and economic benefits of oilfield crude oil.

Description

Technical Field

[0001] This invention belongs to the technical field of oilfield production equipment, and specifically relates to a digital anti-theft needle valve. Background Technology

[0002] At oilfield production sites, sampling valves (usually needle valves) are installed at the oil outlets. Their core function is to provide samples for crude oil analysis. When crude oil composition and index testing is required, operators open the valve by rotating the needle valve handwheel, collect a small sample of crude oil, and send it to the laboratory for testing and analysis, providing data support for oilfield production control. As a type of fine-tuning valve, the needle valve has a needle-shaped valve plug that moves along the water flow direction, changing the flow cross-sectional area to cut off or regulate the flow rate. It features high adjustment accuracy, adapting to the precise control requirements of crude oil sampling. Its maximum working pressure can reach 414 Bar, and it has a wide temperature adaptability range, meeting the stringent operating conditions of oilfield production sites.

[0003] However, the needle valves currently used in oilfield production sites only have basic sampling functions and lack effective anti-theft mechanisms, making them a primary channel for illegal crude oil theft. Especially at night and in remote oilfield sites where supervision is weak, criminals steal crude oil from the sampling valves by illegally rotating the needle valve handwheel or disassembling valve components. This not only causes significant oil loss and substantial economic damage but also risks oil spills due to improper operation, leading to environmental pollution, fires, and other safety accidents, severely disrupting normal oilfield production.

[0004] Currently, there are few improved solutions for anti-theft measures for sampling valves. Existing technologies often employ simple mechanical locks to lock the handwheel, which are simple in structure, have poor anti-theft performance, and are easily damaged by criminals. While some solutions add alarm devices, they suffer from complex structures, require changes to the original needle valve's working principle, cannot adapt to the required field pressure, or are inconvenient to install and maintain, and have insufficient battery life, making widespread application in oilfield production sites difficult. Furthermore, oilfield production sites are often in low-temperature environments, where the discharge performance of conventional batteries drops significantly at low temperatures, making it impossible to guarantee the long-term stable operation of alarm devices, further limiting the practicality of existing anti-theft solutions.

[0005] Therefore, there is a need for a digital anti-theft needle valve that can add a reliable digital anti-theft mechanism without changing the original needle valve working principle and meeting the on-site pressure requirements, so as to realize real-time alarm for abnormal handwheel operation and abnormal bottom cover disassembly, and is suitable for low temperature environment and whose battery can be easily replaced, in order to solve the above technical problems. Summary of the Invention

[0006] This invention aims to retain the original working principle of the needle valve and ensure that the valve pressure meets the requirements of oilfield use. By optimizing the shell structure and adding a digital anti-theft mechanism, the handwheel rotation action is converted into the vertical pulse action of the stylus, triggering the micro-switch to realize the alarm. At the same time, it realizes the alarm for abnormal disassembly of the bottom cover. The use of a low-temperature lithium battery ensures stable operation in low-temperature environments, and the battery can be replaced regularly, thereby effectively curbing crude oil theft, ensuring the safety and economic benefits of oilfield production, and taking into account the convenience of sampling operation and the maintainability of the equipment.

[0007] This invention provides the following technical solution: a digital anti-theft needle valve, comprising a valve body, a valve stem, a handwheel, and a valve seat. One end of the valve stem is fixedly connected to the handwheel, and the other end of the valve stem engages with the valve seat. Rotating the handwheel drives the valve stem to move axially, thereby opening and closing the valve. The digital anti-theft needle valve also includes a contact needle and a first micro-switch. The contact needle is slidably connected to the inner cavity of the valve seat, and the sliding direction of the contact needle is parallel to the axial direction of the valve stem. A return spring is wrapped around the contact needle, one end of which is fixedly connected to the contact needle, and the other end of which is fixedly connected to the valve seat. The bottom of the contact needle is connected to the trigger end of the first micro-switch, which is a normally open switch. The upper part of the valve seat has an annular step extending radially inward. The upper surface of the step is horizontal, and a through hole parallel to the axial direction of the valve stem is provided on the step. The upper end of the contact needle passes through the through hole from bottom to top, and the top of the contact needle is not lower than the upper opening of the through hole. A disc-shaped pressure plate is fixedly connected to the valve stem. The pressure plate is located inside the valve seat cavity, and its bottom surface is parallel to the upper end face of the step. The bottom surface of the pressure plate has an upwardly recessed hemispherical groove. A ball bearing that matches the hemispherical groove is rotatably connected inside the groove, and the bottom of the ball bearing rolls around the upper end face of the step. The upper opening of the through hole is located on the rolling path of the ball bearing. The diameter of the upper opening of the through hole is no greater than half the diameter of the ball bearing, and the height of the top of the contact pin extending out of the upper opening of the through hole does not exceed one-third of the diameter of the ball bearing. The first micro-switch is electrically connected to a signal transmitting module. When the valve is in the normally closed state, the ball bearings on the bottom of the pressure plate do not contact the contact pin, the return spring is in a naturally extended state, the top of the contact pin extends out of the upper orifice of the through hole, the trigger end of the first micro-switch is not pressed, the switch remains in the normally open state, and the signal transmission module does not work. When the handwheel is rotated and drives the valve stem to move axially, the pressure plate moves synchronously with the valve stem, and the ball bearings roll along the upper end face of the step. When the ball bearings roll to the position of the upper orifice of the through hole, the ball bearings will squeeze the top of the contact pin, causing the contact pin to slide downward against the elastic force of the return spring. The bottom of the contact pin presses the trigger end of the first micro-switch, closing the normally open switch. At this time, the signal transmission module is triggered and immediately sends a signal of abnormal valve opening to the remote monitoring terminal, realizing real-time monitoring of the valve operation status and anti-theft early warning.

[0008] Preferably, there are 2 to 12 hemispherical grooves, which are evenly distributed in a ring on the bottom surface of the pressure plate. By evenly distributing multiple hemispherical grooves in a ring on the bottom surface of the pressure plate and configuring ball bearings, the contact frequency between the ball bearings and the stylus can be increased during the rotation of the pressure plate. That is, the first micro-switch is triggered once every certain rotation angle, thereby converting the continuous rotation of the handwheel into multiple discrete electrical signal pulses. This allows the remote monitoring terminal to determine the rotation speed and operation range of the handwheel based on the number of pulses and the interval time, further improving the accuracy of abnormal operation identification and avoiding missed detections caused by poor contact of a single ball bearing. At the same time, the arrangement of multiple ball bearings can also distribute the pressure of the pressure plate on the step, reduce component wear, and extend the service life of the equipment.

[0009] More preferably, the balls are made of nylon or polytetrafluoroethylene (PTFE). Nylon and PTFE materials have excellent wear resistance and self-lubricating properties, effectively reducing the coefficient of friction when the balls roll on the upper surface of the step, minimizing mechanical wear and noise caused by friction, and ensuring the smoothness and stability of the ball rolling process. Simultaneously, these two materials have good corrosion resistance and high / low temperature resistance, enabling them to adapt to the complex working conditions of oilfield production sites, preventing ball performance degradation due to crude oil corrosion or temperature changes, ensuring long-term stable operation of the anti-theft mechanism, and reducing maintenance costs.

[0010] Preferably, the bottom of the valve seat has a receiving cavity containing a battery, which is electrically connected to the first micro-switch and the signal transmitting module. By providing a receiving cavity and a built-in battery at the bottom of the valve seat, an independent and stable power supply can be provided for the first micro-switch and the signal transmitting module, avoiding reliance on external power lines and improving the applicability and installation flexibility of the equipment in the field oilfield environment. At the same time, integrating the battery inside the valve seat can effectively protect the battery from external impacts and harsh environments, ensuring the reliability of the power supply system and providing energy security for the continuous operation of the anti-theft alarm function.

[0011] More preferably, the accommodating cavity is provided with a bottom cover, which is threadedly connected to the opening of the accommodating cavity. A second micro-switch is provided inside the accommodating cavity, and the trigger end of the second micro-switch is connected to the bottom cover. The second micro-switch is a normally closed switch. When the bottom cover is in the normally tightened state, the bottom cover will press the trigger end of the second micro-switch, keeping the normally closed switch in the open state. At this time, the signal transmitting module does not send a bottom cover abnormality signal. When criminals attempt to remove the bottom cover to damage the battery or the anti-theft mechanism, the bottom cover separates from the opening of the accommodating cavity, the pressure on the trigger end of the second micro-switch disappears, the normally closed switch returns to the closed state, and the signal transmitting module is then triggered to send an alarm signal indicating that the bottom cover has been abnormally removed to the remote monitoring terminal, thereby realizing the anti-theft protection of the battery compartment and further improving the overall anti-theft performance of the device.

[0012] More preferably, the accommodating cavity is equipped with a battery power detection unit, which is electrically connected to the battery and the signal transmission module. The battery power detection unit can monitor the remaining battery power in real time and transmit the power data to the signal transmission module. When the battery power falls below a preset threshold, the signal transmission module will proactively send a low battery warning signal to the remote monitoring terminal, reminding staff to replace the battery in time. This prevents the anti-theft alarm function from failing due to battery depletion, ensuring the long-term stable operation of the equipment at the oilfield production site, reducing the risk of crude oil theft due to sudden power outages, and facilitating maintenance personnel to rationally schedule battery replacement cycles, improving the planning and efficiency of equipment maintenance.

[0013] Even better, the accommodating cavity is equipped with an electronic encryption lock, which is electrically connected to the signal transmitting module. The electronic encryption lock strictly controls access to the accommodating cavity; only authorized personnel with the key can legally open it, effectively preventing unauthorized individuals from breaking the mechanical lock and arbitrarily opening the cavity. When the electronic encryption lock detects an unauthorized opening attempt, it immediately transmits an abnormal signal to the signal transmitting module, which then sends an alarm message to the remote monitoring terminal, enabling digital management of the accommodating cavity's opening permissions. This further enhances the device's anti-theft security and ensures that core components such as the battery and the second micro-switch are not illegally accessed or damaged.

[0014] Preferably, the valve seat is equipped with an audible and visual alarm, which is electrically connected to the signal transmitting module. When the signal transmitting module receives a trigger signal from the first or second micro-switch, or when the electronic encryption lock detects unauthorized opening, the audible and visual alarm will be activated simultaneously. The alarm will immediately emit a high-decibel alarm sound and simultaneously emit a flashing bright light through the built-in LED, creating a dual warning effect through both sight and sound. This immediate on-site alarm can have a strong deterrent effect on criminals, preventing them from continuing to commit theft; at the same time, the audible and visual signals can also quickly attract the attention of nearby inspection personnel or workers, facilitating their timely arrival at the scene to handle the situation, effectively preventing crude oil theft or equipment damage, further improving the response speed and actual effect of anti-theft measures, and forming a dual protection system combining remote monitoring and on-site warning.

[0015] The beneficial effects of this invention are: 1. This invention offers reliable anti-theft performance and effectively curbs crude oil theft: By adding a digital anti-theft mechanism, the invention converts the rotation of the handwheel into a vertical pulse action of the stylus, triggering a micro-switch to trigger an alarm. Simultaneously, the removal of the bottom cover also triggers an alarm, forming dual anti-theft protection. Combined with a handwheel encryption lock and local / remote dual alarm modes, it can promptly detect theft by criminals, demonstrating a significant deterrent effect. This fundamentally solves the problem of sampling valves being easily stolen, ensuring the safety and economic benefits of oilfield crude oil.

[0016] 2. This invention does not change the existing needle valve principle and is adapted to field conditions: This invention only optimizes the shell structure of the original needle valve and adds anti-theft, power supply and control mechanisms, without changing the internal structure and working principle of the original needle valve, ensuring that the sampling function of the needle valve is not affected; at the same time, the overall structure is integrally molded with high-strength materials, which meets the pressure strength requirements of oilfield production sites, is adapted to the high pressure and complex working environment, and has good sealing performance to avoid crude oil leakage.

[0017] 3. This invention is suitable for low-temperature environments, with stable battery life and convenient maintenance: This invention uses a low-temperature lithium battery for power supply. This battery is made of special materials and electrolyte, which can discharge stably in the low-temperature environment of oil fields and has a strong battery life. It solves the problem of poor discharge performance and unstable operation of conventional batteries in low-temperature environments. At the same time, the battery is detachable and can be quickly replaced after the bottom cover is unlocked. It is convenient to maintain and does not affect normal sampling operations. It also has a power detection and reminder function to ensure continuous and stable operation of the equipment.

[0018] 4. This invention has a high degree of digitalization and convenient monitoring: Through the wireless transmission unit of the control mechanism, information such as alarm signals, equipment operating status, and battery power can be remotely transmitted to the monitoring center and management personnel terminals, realizing remote real-time monitoring. Staff do not need to be on-site to keep track of equipment status in a timely manner, reducing the cost of human supervision and improving the level of intelligent management at the oilfield production site.

[0019] 5. The invention has a reasonable structure and strong practicality: The anti-theft mechanism, power supply mechanism and control mechanism of the invention are all integrated on the needle valve body, which is compact and easy to install. It does not require large-scale modification of the needle valves in the existing oil production site and can directly replace the original needle valves, adapting to the sampling needs of various oilfield production sites; at the same time, during normal sampling, authorized personnel can unlock and operate the handwheel, and the control mechanism can recognize the normal operation signal to avoid false alarms, thus balancing anti-theft performance and sampling convenience.

[0020] 6. The present invention has a timely alarm response and a low false trigger rate: It uses a micro-motion limit switch as the trigger element, which has a fast contact switching speed and short response time, and can trigger the alarm the moment that criminals operate the handwheel or remove the bottom cover; at the same time, the signal processing unit of the control mechanism can filter and amplify the trigger signal, and in combination with the handwheel encryption lock, it can effectively reduce the false alarm rate and ensure the accuracy of the alarm signal. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a digital anti-theft needle valve according to the present invention; Figure 2 This is a schematic half-sectional view of the valve body of the present invention; Figure 3 This is a full sectional view of the valve body with handwheel of the present invention.

[0022] The components are as follows: 1. Valve body; 2. Valve stem; 3. Handwheel; 4. Valve seat; 5. Contact pin; 6. First micro switch; 7. Return spring; 8. Step; 9. Through hole; 10. Pressure plate; 11. Hemispherical groove; 12. Ball; 13. Receiving cavity; 14. Battery; 15. Bottom cover; 16. Second micro switch. Detailed Implementation

[0023] The related technologies of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0024] like Figures 1-3 As shown, this embodiment of a digital anti-theft needle valve includes a valve body 1, a valve stem 2, a handwheel 3, and a valve seat 4. One end of the valve stem 2 is fixedly connected to the handwheel 3, and the other end cooperates with the valve seat 4. Rotating the handwheel 3 drives the valve stem 2 to move axially, thereby opening and closing the valve. This embodiment of the digital anti-theft needle valve also includes an anti-theft mechanism, a power supply mechanism, and a control mechanism. The anti-theft mechanism, power supply mechanism, and control mechanism are all integrated into the original needle valve body, without changing the original needle valve's internal structure and working principle. Moreover, the overall structure meets the pressure intensity requirements of oilfield production sites (maximum working pressure not less than 414 Bar), adapting to field conditions. The anti-theft mechanism includes an action conversion component, a contact pin 5, and a first micro-switch 6. The action conversion component is fixedly installed at the connection between the handwheel 4 and the valve body 2, and is used to convert the rotational action of the handwheel 3 into a vertical pulse action of the contact pin 5. The contact pin 5 is vertically arranged below the action conversion component, with its top end in contact with the action conversion component and its bottom end correspondingly connected to the first micro-switch 6. The first micro-switch 6 is fixedly installed on the valve body 1 housing and is electrically connected to the control mechanism. The first micro-switch 6 is based on a combination of tension spring and compression spring to achieve action. When the contact pin 5 is subjected to a vertical pulse force, it triggers the contact switching of the first micro-switch 6, generates an electrical signal and transmits it to the control mechanism, thereby triggering an alarm action. The contact switching time of the first micro-switch 6 is controlled within 5 to 15 milliseconds to ensure the timeliness of the alarm response and avoid false triggering or delayed triggering. The valve body 1 housing has been structurally optimized by adding an installation cavity to the original housing for embedding and installing micro-motion limit switches and control mechanisms. At the same time, a receiving cavity 13 is opened at the bottom of the valve body 1 to serve as the installation space for the battery box and circuit board. A removable bottom cover 15 is provided at the opening of the receiving cavity 13. A sealing structure (using a sealing ring) is provided between the bottom cover 15 and the receiving cavity 13 to ensure sealing performance and prevent crude oil and water from entering the receiving cavity 13 and damaging internal components. The sealing structure can be a sealing ring adapted to high-pressure conditions, and the specifications can refer to the existing needle valve sealing standards. The power supply mechanism includes a low-temperature lithium battery and a battery interface. The low-temperature lithium battery is installed in the accommodating cavity 13 at the bottom of the valve body 1 (inside the battery box) and is electrically connected to the control mechanism through the battery interface, providing stable power to the entire anti-theft system and control mechanism. The low-temperature lithium battery uses VGCF and activated carbon with a specific surface area of ​​(2000±500)㎡ / g as additives and matching positive and negative electrode materials, and is injected with a special electrolyte with added special additives, making it suitable for the low-temperature working environment of oil fields. The civilian-grade low-temperature lithium battery can discharge at 0.2C at -20℃, accounting for more than 90% of its rated capacity. The special-grade battery can discharge at 0.2C at -40℃, retaining more than 80% of its rated capacity, meeting the low-temperature requirements of oilfields in different regions. Furthermore, its volume change rate after 24 hours at 70℃ is ≤0.5%, providing the safety and storage functions of a conventional lithium battery and preventing safety hazards in high-temperature environments. A second micro-switch 16 is installed at the connection between the bottom cover 15 and the accommodating cavity 13. The second micro-switch 16 is electrically connected to the control mechanism. When the bottom cover 15 is illegally opened, the second micro-switch 16 is triggered, generating an electrical signal that is transmitted to the control mechanism, triggering an alarm.

[0025] The control mechanism includes a circuit board and an alarm module. The circuit board is installed in the accommodating cavity 13 at the bottom of the valve body 1 and is electrically connected to the first micro-switch 6, the second micro-switch 16, and the low-temperature lithium battery. The circuit board integrates a signal processing unit, a wireless transmission unit, and a control unit. The signal processing unit is used to receive the electrical signals transmitted by the first micro-switch 6 and the second micro-switch 16, and to filter and amplify the signals to avoid false triggering. The wireless transmission unit is used to remotely transmit the alarm signal to the oilfield monitoring center to realize remote alarm, and can also transmit the equipment operating status (such as battery level). The control unit is used to control the start and stop of the alarm module. When an abnormal electrical signal is received (abnormal rotation of the handwheel, abnormal opening of the bottom cover), it immediately controls the alarm module to issue an alarm signal. Furthermore, the alarm module includes a local audible and visual alarm unit and a remote alarm unit. The local audible and visual alarm unit uses a high-decibel buzzer and a warning light, which are installed on the outside of the valve body. When the alarm is triggered, the buzzer emits a high-decibel alarm sound and the warning light flashes, serving as an on-site warning and deterring criminals. The remote alarm unit transmits the alarm signal to the monitoring center through a wireless transmission unit (such as a 4G, 5G, or IoT module), and can also push it to the mobile terminal of on-site management personnel to achieve remote real-time monitoring and ensure that management personnel can respond in a timely manner. Furthermore, the handwheel 3 is equipped with an encryption lock, which is used to lock the handwheel 3. Only authorized personnel can unlock and operate it. The encryption lock is electrically connected to the control mechanism. When the handwheel 3 is rotated in the unlocked state, the contact pin 5 triggers the micro limit switch, and the control mechanism controls the alarm module to immediately start the alarm, further improving the anti-theft performance. Furthermore, the circuit board integrates a battery power detection unit for real-time detection of the power level of the low-temperature lithium battery. When the power level is lower than a preset threshold, a power reminder signal is sent to the monitoring center and management personnel terminal via a wireless transmission unit to remind staff to replace the battery in time. Furthermore, the motion conversion component can be adjusted according to actual needs, so that when the handwheel 3 rotates at a preset angle (such as 15° or 30°), the stylus completes a pulse action and triggers the micro-switch. This can avoid false alarms during normal sampling operations (the handwheel rotation angle can be preset during normal sampling, and the control mechanism can identify the signal difference between normal and abnormal operations), and also ensure that an alarm is triggered in time when criminals rotate the handwheel. Furthermore, the mounting cavity and the receiving cavity 13 of the valve body 1 shell are both made of high-strength alloy material and are integrally formed with the original valve body shell to ensure the strength and sealing of the overall structure, meet the pressure strength requirements of the oilfield production site, avoid the decrease in valve body strength due to the addition of the mechanism, and prevent crude oil leakage. Furthermore, the low-temperature lithium battery is detachable. After the bottom cover is unlocked (authorized unlocking), the battery can be quickly removed for replacement. The replacement process is simple and convenient, without disassembling the entire needle valve, and does not affect the normal sampling operation of the oil field. When replacing the battery, the control mechanism can temporarily disable the alarm function, which will be automatically restored after the replacement is completed, to avoid triggering false alarms during the replacement process.

[0026] Example

[0027] Normal sampling operation: Authorized personnel enter a password to unlock the encryption lock on handwheel 3, rotate handwheel 3, and drive valve stem 2 to move axially to open the valve and collect crude oil samples; at the same time, handwheel 3 drives ball bearing 12 to rotate synchronously through valve stem 2, ball bearing 12 squeezes the contact needle 5, causing the contact needle 5 to make pulse motion in the vertical direction, triggering the first micro-switch 6 to generate an electrical signal; this electrical signal is transmitted to the signal processing unit of the circuit board, processed and transmitted to the control unit, the control unit recognizes it as a normal operation signal and does not activate the alarm module; after sampling is completed, rotate handwheel 3 in the opposite direction to close the valve, the contact needle 5 is reset under the action of return spring 7, and the first micro-switch 6 returns to its initial state.

[0028] Anti-theft alarm operation: When criminals rotate handwheel 3 without unlocking the encrypted lock, ball bearing 12 drives contact pin 5 to generate a pulse action, triggering the first micro-switch 6. The electrical signal is processed and transmitted to the control unit, which immediately controls the alarm module to start, the local buzzer sounds and the warning light flashes. At the same time, the wireless transmission unit transmits the alarm signal to the monitoring center and the mobile terminal of the management personnel. If criminals attempt to remove the bottom cover 15 to steal the battery 14 or damage the equipment, the second micro-switch 16 at the connection between the bottom cover 15 and the accommodating cavity 13 is triggered, which also activates the alarm module, realizing dual anti-theft alarm.

[0029] Battery replacement procedure: When the battery power detection unit detects that the low-temperature lithium battery power is below 30%, it sends a power reminder signal to the monitoring center and management personnel terminal; the management personnel carry the spare low-temperature lithium battery, enter the password to unlock the bottom cover 15 (the control unit temporarily disables the alarm function when unlocking), take out the old battery, replace it with the new battery, close the bottom cover 15 after the replacement is completed, and the control unit automatically restores the alarm function to complete the battery replacement.

[0030] In summary, this invention deeply integrates mechanical structure with digital technology to construct an intelligent needle valve system that combines anti-theft alarm, remote monitoring, and low-temperature operation. Through a dual anti-theft trigger mechanism (abnormal handwheel rotation and illegal opening of the bottom cover), local and remote collaborative alarm modes, and a structural design adapted to complex oilfield conditions, it not only effectively fills the gap in the anti-theft performance of traditional sampling valves but also reduces on-site supervision costs through digital management. It provides a practical solution for the safety protection and intelligent upgrading of oilfield production equipment, and has significant application value.

[0031] It should be emphasized that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A digital anti-theft needle valve, comprising: The valve comprises a valve body (1), a valve stem (2), a handwheel (3), and a valve seat (4). One end of the valve stem (2) is fixedly connected to the handwheel (3), and the other end of the valve stem (2) is engaged with the valve seat (4). The valve is opened and closed by rotating the handwheel (3) to drive the valve stem (2) to move axially. It also includes a contact pin (5) and a first micro-switch (6). The contact pin (5) is slidably connected to the inner cavity of the valve seat (4). The sliding direction of the contact pin (5) is parallel to the axial direction of the valve stem (2). A return spring (7) is wrapped around the contact pin (5). One end of the return spring (7) is fixedly connected to the contact pin (5), and the other end of the return spring (7) is fixedly connected to the valve seat (4). The bottom of the contact pin (5) is connected to the trigger end of the first micro-switch (6). The first micro-switch (6) is a normally open switch. The upper part of the valve seat (4) is provided with an annular step (8) extending radially inward. The upper end face of the step (8) is horizontal. The step (8) is provided with a through hole (9) parallel to the axial direction of the valve stem (2). The upper end of the stylus (5) passes through the through hole (9) from bottom to top. The top of the stylus (5) is not lower than the upper opening of the through hole (9). A disc-shaped pressure plate (10) is fixedly connected to the valve stem (2). The pressure plate (10) is located in the inner cavity of the valve seat (4). The bottom surface of the pressure plate (10) is parallel to the upper end surface of the step (8). The bottom surface of the pressure plate (10) is provided with an upwardly recessed hemispherical groove (11). A ball (12) matching the hemispherical groove (11) is rotatably connected in the hemispherical groove (11). The bottom of the ball (12) rolls around the upper end surface of the step (8). The upper opening of the through hole (9) is located on the rolling path of the ball (12). The diameter of the upper opening of the through hole (9) is not greater than half the diameter of the ball (12). The height of the top of the stylus (5) extending out of the upper opening of the through hole (9) does not exceed one-third of the diameter of the ball (12). The first micro-motion limit switch (6) is electrically connected to a signal transmitting module.

2. The digital anti-theft needle valve according to claim 1, characterized in that, The hemispherical groove (11) is provided in 2 to 12 parts, and the hemispherical groove (11) is evenly distributed in a ring on the bottom surface of the pressure plate (10).

3. The digital anti-theft needle valve according to claim 2, characterized in that, The ball bearing (12) is made of nylon or polytetrafluoroethylene.

4. The digital anti-theft needle valve according to claim 1, characterized in that, The bottom of the valve seat (4) is provided with a receiving cavity (13), and a battery (14) is provided in the receiving cavity (13). The battery (14) is electrically connected to the first micro-motion limit switch (6) and the signal transmission module.

5. A digital anti-theft needle valve according to claim 4, characterized in that, The accommodating cavity (13) is provided with a bottom cover (15), the bottom cover (15) is threaded to the opening of the accommodating cavity (13), and a second micro-motion limit switch (16) is provided inside the accommodating cavity (13). The trigger end of the second micro-motion limit switch (16) is connected to the bottom cover (15), and the second micro-motion limit switch (16) is a normally closed switch.

6. A digital anti-theft needle valve according to claim 4, characterized in that, The cavity (13) is equipped with a battery power detection unit, which is electrically connected to the battery (14) and the signal transmission module.

7. A digital anti-theft needle valve according to claim 4, characterized in that, The cavity (13) is equipped with an electronic encryption lock, which is electrically connected to the signal transmission module.

8. A digital anti-theft needle valve according to claim 1, characterized in that, The valve seat (4) is equipped with an audible and visual alarm, which is electrically connected to the signal transmitting module.

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