Electric anti-theft unloading valve

Abstract

This utility model discloses an electric anti-theft unloading valve, which adds an electric anti-theft device to the existing unloading valve body structure. The electric anti-theft device includes an electric drive device and a limiting device. The electric drive device provides power, and the limiting device restricts the valve stem displacement through the cooperation of the transmission shaft and the limiting shaft. Combined with the collaborative work of the sensing monitoring device and the signal processor, it solves the problems of insufficient anti-theft performance and lack of real-time monitoring of traditional unloading valves. It can improve anti-theft security through electric locking, position monitoring and abnormal alarm.

Description

Technical Field

[0001] This application relates to the field of unloading valve technology, specifically to an electric anti-theft unloading valve. Background Technology

[0002] In oil tanker transportation and unloading operations, the unloading valve, as a key component controlling the outflow of oil, is of paramount importance in terms of safety and anti-theft performance. Traditional unloading valves are mainly operated manually. Their structure typically includes a valve body, valve stem, valve disc, and manual opening and closing mechanism. The axial movement of the valve stem drives the valve disc to open or close the unloading port to meet the needs of normal unloading operations. However, during transportation, the valve stem can be forcibly opened by others using external force, leading to the theft of oil.

[0003] Existing unloading valves can only achieve basic unloading control functions and generally lack effective anti-theft mechanisms. Most rely solely on simple mechanical locks or manual guarding for theft prevention. Such simple anti-theft methods are insufficient to resist illegal prying or forced opening, leading to frequent oil theft or illegal unloading, posing a significant threat to the safety of oil transportation.

[0004] Therefore, there is an urgent need to provide an oil unloading valve with high anti-theft performance. Utility Model Content

[0005] The purpose of this application is to provide an electric anti-theft unloading valve to solve the problem of insufficient anti-theft performance of traditional unloading valves.

[0006] This application provides an electric anti-theft unloading valve, the technical solution of which is as follows: it includes a valve body, a valve stem, and a valve disc. The valve disc is fixedly connected to the lower end of the valve stem. The valve stem can drive the valve disc to open or close by moving axially along the valve body. It also includes an electric anti-theft device, which is installed on the valve body and includes an electric drive device and a limiting device. The limiting device is connected to the output end of the electric drive device. The limiting device has a first position that locks the valve stem to prevent its axial movement and thus keeps the valve disc in a closed state, and a second position that releases the lock on the valve stem and allows its axial movement.

[0007] Furthermore, this application also proposes that the limiting device includes a limiting shaft and a sensing box disposed on the valve body; the sensing box is provided with a shaft hole, the limiting shaft is movably inserted into the shaft hole, the limiting shaft is connected to the output end of the electric drive device, and moves axially under the drive of the electric drive device to abut or disengage from the top of the valve stem.

[0008] Furthermore, this application also proposes that the electric drive device is located inside the motor housing, the motor housing is fixedly installed on the outer wall of the valve body and is arranged adjacent to the induction box, the electric drive device includes an electric mechanism and a transmission mechanism, the output end of the electric mechanism is connected to the transmission mechanism, and the output end of the transmission mechanism is drivenly connected to the limiting shaft of the limiting device.

[0009] Furthermore, this application also proposes that the transmission mechanism includes a first gear shaft, a second gear shaft, and a drive shaft, wherein the drive gears of the first gear shaft and the second gear shaft mesh with each other, and the end of the drive shaft near the electric mechanism is fixedly connected to the first gear shaft and is driven to rotate by the first gear shaft.

[0010] Furthermore, this application also proposes that the valve body is provided with a transmission shaft hole, and the transmission shaft is rotatably disposed in the transmission shaft hole through a rolling bearing; the end of the transmission shaft away from the electric mechanism is provided with an external thread, and the limiting shaft is provided with an internal thread hole that matches the external thread, and the transmission shaft and the limiting shaft form a screw drive cooperation.

[0011] Furthermore, this application also proposes that the electric mechanism includes a magnetic sensing element and a drive motor, wherein the output end of the magnetic sensing element is connected to the first gear shaft, and the output end of the drive motor is connected to the second gear shaft.

[0012] Furthermore, this application also proposes that the first sensing element is a permanent magnet ring, and the electric anti-theft device further includes a sensing monitoring device, which includes a first sensing element, a second sensing element, a first sensor, and a second sensor; the first sensing element is disposed on the valve stem, the second sensing element is disposed on the limiting shaft, the first sensor is installed on the sensing box corresponding to the position of the first sensing element, and is used to monitor the position change of the first sensing element; the second sensor is installed on the sensing box corresponding to the position of the second sensing element, and is used to monitor the position change of the second sensing element.

[0013] Furthermore, this application also proposes that the first sensing element is a permanent magnet ring, the upper end of the valve stem is threaded with a sensing cap, the inner sidewall of the sensing cap is provided with an annular groove, and the permanent magnet ring is embedded in the annular groove;

[0014] The second sensing element is a permanent magnet strip, and the outer peripheral wall of the limiting shaft is provided with a mounting groove, in which the permanent magnet strip is embedded;

[0015] Both the first sensor and the second sensor are Hall displacement sensors. The first sensor is mounted on the sensing box, and its sensing surface is parallel to the axis of the first sensing element. The second sensor is mounted on the sensing box, and its sensing surface is parallel to the axis of the second sensing element.

[0016] Furthermore, this application also proposes that the sensing monitoring device is electrically connected to a signal processor, which is used to receive the detection signals from the first sensor and the second sensor, and based on preset logic judgment, generate an illegal operation alarm signal when the position signal of the second sensing element is detected to be in the locking position where the limiting shaft abuts the top of the valve stem, and the position signal of the first sensing element shows an upward movement.

[0017] Furthermore, this application also proposes an opening and closing mechanism for driving the valve stem to move up and down. The opening and closing mechanism includes a handle, a rotating shaft, and a gear. One end of the rotating shaft is fixedly connected to the handle, and the gear is fixedly installed at the other end of the rotating shaft that extends into the valve body. The gear meshes with the rack portion on the valve stem, converting the rotational motion of the rotating shaft into the axial sliding motion of the valve stem.

[0018] The beneficial effect of this application is that it provides an electric anti-theft unloading valve, including an unloading valve body and an electric anti-theft device. The electric anti-theft device restricts the displacement of the valve stem and monitors its position in real time. Combined with the collaborative work of the induction monitoring device and the signal processor, it solves the problems of insufficient anti-theft performance and lack of real-time monitoring of traditional unloading valves. It can improve anti-theft security through electric locking, position monitoring and abnormal alarm. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0020] Figure 1 This is a cross-sectional structural diagram of the electric anti-theft unloading valve in the embodiment of the application;

[0021] Figure 2 This is a schematic diagram of the split structure of the electric anti-theft unloading valve in the embodiment of the application;

[0022] Figure 3 This is a schematic diagram of the internal structure of the electric anti-theft device according to an embodiment of the application;

[0023] Figure 4 This is a schematic diagram of the overall structure of an embodiment of the application.

[0024] The following are the labeling elements in the figure:

[0025] 1. Valve body; 2. Valve stem; 21. Rack section; 3. Electric drive device; 31. Motor housing; 32. Electric mechanism; 321. Magnetic sensing element; 322. Drive motor; 33. Transmission mechanism; 331. First gear shaft; 332. Second gear shaft; 333. Drive gear; 4. Limiting device; 41. Limiting shaft; 411. Mounting groove; 42. Sensing box; 43. Shaft hole; 44. Transmission shaft; 5. Sensing monitoring device; 51. First sensing element; 52. Second sensing element; 53. First sensor; 54. Second sensor; 55. Sensing cap; 551. Annular groove; 6. Opening and closing mechanism; 61. Handle; 62. Rotating shaft; 63. Gear; 7. Valve disc. Detailed Implementation

[0026] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of this application, and not all embodiments. The components of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0027] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this application, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0028] This application proposes an electrically operated anti-theft unloading valve; please refer to [reference needed]. Figure 1 and Figure 2 The valve body includes a valve body 1, a valve stem 2, and a valve disc 7. The valve disc 7 is fixedly connected to the lower end of the valve stem 2. The valve stem 2 can drive the valve disc 7 to open or close by moving axially along the valve body 1. An electric anti-theft device is installed on the valve body 1 and includes an electric drive unit 3 and a limiting device 4. The limiting device 4 is connected to the output end of the electric drive unit 3. The limiting device 4 has a first position that locks the valve stem 2 to prevent its axial movement, thereby keeping the valve disc 7 in a closed state, and a second position that releases the lock on the valve stem 2, thereby allowing its axial movement.

[0029] It can be understood that an electric anti-theft device refers to a combined component consisting of an electric drive device 3 and a limiting device 4. The electric drive device 3 is a device that generates mechanical movement through electric power, specifically implemented as a combination of a motor and a transmission mechanism 33. Its function is to provide power to the limiting device 4, enabling the switching between locked and unlocked states. The limiting device 4 is a mechanical structure that restricts the axial movement of the valve stem, specifically implemented as a movable limiting component or a snap-fit ​​structure. This device controls its position through the electric drive device 3; in the first position, it physically interferes with the valve stem, preventing its movement; in the second position, it disengages from the valve stem, releasing the lock.

[0030] Specifically, after receiving a control signal, the electric drive unit drives the limit device to move. When it is necessary to lock the unloading valve, the electric drive unit 3 pushes the limit shaft 41 to the top of the valve stem 2, preventing it from moving axially, and the valve disc 7 remains closed. During the unloading operation, the electric drive unit 3 drives the limit shaft 41 to disengage from the valve stem 2, allowing the valve stem 2 to move normally to open the valve disc 7. During this process, the position switching of the limit device 4 is completely controlled by the electric drive unit 3, requiring no manual intervention, and the locked state is difficult to remove through physical destruction.

[0031] Through the above solution, this application achieves electric control of the stroke of the unloading valve stem 2, effectively preventing oil theft caused by illegal operation. The electric anti-theft device can be remotely controlled, improving the safety of tanker transportation. The limit device 4 acts directly on the valve stem 2, forming a physical block, which has stronger anti-vandalism capabilities compared to traditional mechanical locks. This solution not only solves the problem of traditional unloading valves being easily forced open by external force, but also improves operational convenience through electric control, reduces the need for manual supervision, and lowers the labor costs for transportation companies.

[0032] like Figure 1 and Figure 3 As shown, this application further proposes that the limiting device 4 includes a limiting shaft 41 and a sensing box 42 disposed on the valve body 1; the sensing box 42 is provided with a shaft hole 43, the limiting shaft 41 is movably inserted into the shaft hole 43, the limiting shaft 41 is connected to the output end of the electric drive device 3, and moves axially under the drive of the electric drive device 3 to abut or disengage from the top end of the valve stem 2. The aforementioned abutment constitutes a locked state between the limiting shaft 41 and the valve stem 2, at which time the limiting device 4 is in the first position; the aforementioned disengagement constitutes an unlocked state between the limiting shaft 41 and the valve stem 2, at which time the limiting device 4 is in the second position.

[0033] It can be understood that the limiting shaft 41 refers to a rigid component that can move axially. Specifically, it can be made of stainless steel into a cylindrical rod, used to form physical contact or disengagement with the top of the valve stem 2 under the action of the electric drive device 3, thereby locking or releasing the movement of the valve stem 2. The sensing box 42 refers to a closed housing structure fixed to the valve body 1. Specifically, it can be installed by welding or bolting. It has a shaft hole 43 inside to accommodate the movement trajectory of the limiting shaft 41, providing guidance and protection for the limiting shaft 41.

[0034] Specifically, when the limiting shaft 41 is driven by the electric drive device 3, it moves along the axis of the shaft hole 43. When the electric drive device 3 receives a locking command, the limiting shaft 41 moves towards the top of the valve stem 2 until it contacts the top of the valve stem 2. At this time, the axial movement of the valve stem 2 is completely restricted, and the valve disc 7 remains closed. When an unlocking command is received, the limiting shaft 41 moves in the opposite direction and disengages from the top of the valve stem 2. The valve stem 2 regains its axial movement capability, allowing the valve disc 7 to open or close.

[0035] Through the above technical solution, this application can effectively prevent the valve stem 2 from being forcibly moved in an unauthorized state, solving the problem of insufficient anti-theft performance of traditional unloading valves due to the lack of an active locking mechanism. At the same time, the combination of electric drive and mechanical limit improves the safety and reliability of the unloading valve in transportation and unloading operations.

[0036] Further, please refer to Figure 1 and Figure 3 This application proposes that the electric drive device 3 is located inside the motor housing 31, which is fixedly installed on the outer wall of the valve body 1 and adjacent to the sensing box 42. The electric drive device 3 includes an electric mechanism 32 and a transmission mechanism 33. The output end of the electric mechanism 32 is connected to the transmission mechanism 33, and the output end of the transmission mechanism 33 is drivenly connected to the limiting shaft 41 of the limiting device 4.

[0037] It can be understood that the motor housing 31 refers to the enclosed shell used to house the electric drive device 3. Specifically, it can be formed by welding or bolting metal materials. Its function is to provide protection for the electric drive device 3, preventing external environmental corrosion or human damage. The electric mechanism 32 refers to the device that generates rotational power, specifically implemented using a stepper motor or servo motor, used to provide driving force for the transmission mechanism 33. The transmission mechanism 33 refers to the mechanical structure that converts the rotational motion of the electric mechanism 32 into linear motion. Specifically, it can be implemented using a gear set and a lead screw. Its function is to transmit power to the limit shaft 41 to control its axial displacement.

[0038] Specifically, the motor housing 31 is fixed to the outer wall of the valve body 1 by welding or bolting, and is arranged adjacent to the sensing box 42 to shorten the transmission path. The electric mechanism 32 is installed inside the motor housing 31, and its output shaft is connected to the input end of the transmission mechanism 33 through a coupling. The transmission mechanism 33 consists of a gear set and a lead screw. After receiving the rotational power from the electric mechanism 32, the gear set drives the lead screw to rotate. The external thread of the lead screw and the internal thread hole of the limiting shaft 41 cooperate to form a helical transmission pair, converting the rotational motion into the linear movement of the limiting shaft 41. When the electric mechanism 32 is started, the transmission mechanism 33 drives the limiting shaft 41 to move axially to the locked or unlocked position, thereby controlling the axial degree of freedom of the valve stem 2.

[0039] Through the above technical solution, this application effectively prevents damage to the electric drive device 3 by external illegal operation, improves the anti-theft reliability of the unloading valve during transportation and operation, and ensures the stability of the movement of the limit shaft 41 through the mechanical transmission structure, avoiding malfunctions caused by vibration or impact.

[0040] Further, please refer to Figure 3 This application proposes that the transmission mechanism 33 includes a first gear shaft 331, a second gear shaft 332 and a transmission shaft 44. The drive gears 333 of the first gear shaft 331 and the second gear shaft 332 mesh with each other. The end of the transmission shaft 44 near the electric mechanism 32 is fixedly connected to the first gear shaft 331 and is driven to rotate by the first gear shaft 331 and the second gear shaft 332.

[0041] It can be understood that the first gear shaft 331 refers to the gear shaft connected to the output end of the electric mechanism 32, which can be implemented using a cylindrical gear structure, and is used to receive the rotational power of the electric mechanism 32 and transmit it to the second gear shaft 332. The second gear shaft 332 refers to the gear shaft meshing with the first gear shaft 331, which can be implemented using a cylindrical gear structure with the same module, and is used to transmit power to the transmission shaft 44. The transmission shaft 44 refers to the rotating shaft fixedly connected to the first gear shaft 331, which can be implemented using a metal shaft structure, and is used to convert the rotational motion of the first gear shaft 331 into the axial movement of the limiting shaft 41.

[0042] Through the above technical solution, this application can ensure that the power of the electric drive device 3 is stably transmitted to the limiting device 4, so that the limiting shaft 41 accurately abuts against or disengages from the top of the valve stem 2, avoiding the failure of the anti-theft function due to transmission failure, thereby enhancing the anti-theft reliability of the unloading valve during transportation and operation.

[0043] Furthermore, this application proposes that the valve body 1 is provided with a transmission shaft hole, and the transmission shaft 44 is rotatably disposed in the transmission shaft hole through a rolling bearing; the end of the transmission shaft 44 away from the electric mechanism 32 is provided with an external thread, and the limiting shaft 41 is provided with an internal thread hole that matches the external thread, and the transmission shaft 44 and the limiting shaft 41 form a screw drive cooperation.

[0044] It can be understood that the drive shaft hole refers to the hole structure on the valve body 1 used to install the drive shaft 44. Specifically, it can be implemented as a cylindrical through hole, with its axis arranged perpendicular to the axial direction of the valve body 1, to support the rotational movement of the drive shaft 44. The rolling bearing refers to the rotating support component installed in the drive shaft hole, used to reduce the frictional resistance when the drive shaft 44 rotates. The external thread refers to the helical protrusion structure machined at the end of the drive shaft 44, and the internal thread hole refers to the helical groove structure machined inside the limiting shaft 41. Specifically, it can be implemented using thread parameters that match the external thread, used to cooperate with the drive shaft 44 to form a screw drive mechanism.

[0045] Specifically, the drive shaft 44 is mounted in the drive shaft hole of the valve body 1 via rolling bearings, allowing it to rotate freely around its own axis. One end of the drive shaft 44 near the electric mechanism 32 is fixedly connected to the first gear shaft 331, while the other end is machined with an external thread structure. The limiting shaft 41 has an internal thread hole that matches the external thread; the two work together to form a screw drive structure. When the electric mechanism 32 drives the drive shaft 44 to rotate, the interaction between the external thread and the internal thread hole converts the rotational motion of the drive shaft 44 into the axial linear motion of the limiting shaft 41, thereby controlling whether the limiting shaft 41 abuts against or disengages from the top of the valve stem 2.

[0046] Through the above technical solution, this application achieves precise control of the axial movement of the limit shaft 41, ensuring that the valve stem 2 cannot be forcibly pushed by external force in the locked state, thereby effectively preventing the unloading valve from being illegally opened.

[0047] Further, please refer to Figure 1 and Figure 3 This application proposes that the electric mechanism 32 includes a magnetic sensing element 321 and a drive motor 322, wherein the output end of the magnetic sensing element 321 is connected to the first gear shaft 331, and the output end of the drive motor 322 is connected to the second gear shaft 332.

[0048] It can be understood that the magnetic sensing element 321 refers to the sensing device used to sense the number of rotations of the transmission shaft 44. Its output shaft is rigidly connected to the first gear shaft 331 through a coupling. By detecting the rotation angle of the first gear shaft 331, the number of rotations of the transmission shaft 334 can be accurately calculated. Combined with the pitch parameter of the lead screw drive, the axial displacement of the limit shaft 41 can be accurately controlled to ensure precise switching between the "locked position" and the "unlocked position". The drive motor 322 refers to the power device that drives the rotation of the second gear shaft 332. Specifically, a DC servo motor can be used, and its output shaft forms a synchronous transmission with the second gear shaft 332.

[0049] Through the above technical solution, this application not only achieves precise control of the displacement of the limit shaft, but also ensures the stability of power transmission. It improves the reliability of the electric anti-theft device from both the mechanical structure and control logic levels, and effectively solves the problem of insufficient anti-theft performance caused by inaccurate locking position and power transmission failure of traditional unloading valves.

[0050] Further, please refer to Figure 1 and Figure 2 This application proposes that the electric anti-theft device further includes a sensing and monitoring device 5, which includes a first sensing element 51, a second sensing element 52, a first sensor 53, and a second sensor 54. The first sensing element 51 is disposed on the valve stem 2, the second sensing element 52 is disposed on the limiting shaft 41, the first sensor 53 is installed on the sensing box 42 at a position corresponding to the first sensing element 51, and is used to monitor the position change of the first sensing element 51; the second sensor 54 is installed on the sensing box 42 at a position corresponding to the second sensing element 52, and is used to monitor the position change of the second sensing element 52.

[0051] Further, please refer to Figure 3 This application proposes that the first sensing element 51 is a permanent magnet ring, and the upper end of the valve stem 2 is threadedly connected to a sensing cap 55. An annular groove 551 is formed on the inner side wall of the sensing cap 55, and the permanent magnet ring is embedded in the annular groove 551. The second sensing element 52 is a permanent magnet strip, and an installation groove 411 is formed on the outer peripheral wall of the limiting shaft 41, and the permanent magnet strip is embedded in the installation groove 411. The first sensor 53 and the second sensor 54 are both Hall displacement sensors. The vertical sensing surface of the first sensor 53 is parallel to the axis of the first sensing element 51. The sensing surface of the second sensor 54 is parallel to the axis of the second sensing element 52.

[0052] It is understood that the first sensing element 51 is fixed to the upper end of the valve stem 2, and the second sensing element 52 is fixed to the limiting shaft 41 of the limiting device 4. The first sensor 53 and the second sensor 54 are respectively arranged corresponding to the first sensing element 51 and the second sensing element 52, and are used to detect the displacement changes of both. Among them, the permanent magnet ring refers to a ring magnetic element with a constant magnetic field, which can be implemented by a ring magnet made of neodymium iron boron material. It is embedded in the ring groove 551 of the sensing cap 55 and generates a displacement signal by the change of magnetic field. The permanent magnet strip refers to a strip magnetic element with a linear magnetic field, which can be implemented by a rectangular magnetic strip made of ferrite material. It is embedded in the mounting groove 411 of the limiting shaft 41 and changes the magnetic field distribution by axial movement. The Hall displacement sensor refers to a non-contact sensor that detects changes in magnetic field based on the Hall effect. It can be implemented by a linear Hall element and outputs a displacement signal by sensing the change in the magnetic field strength of the permanent magnet. The sensing cap 55 refers to a threaded connector with an annular groove 551, which can be made of stainless steel. It is fixed to the top of the valve stem 2 by a threaded connection and is used to fix the permanent magnet ring and transmit the displacement of the valve stem 2. The mounting groove 411 refers to a groove structure opened along the outer peripheral wall of the limiting shaft 41, which can be formed by milling. It is used to accommodate the permanent magnet strip and maintain its relative position with the limiting shaft 41.

[0053] Specifically, when the limiting shaft 41 moves under the control of the electric drive device 3, the permanent magnet strip moves axially synchronously with the limiting shaft 41. The second sensor 54 determines whether the limiting shaft 41 has reached the locking position by detecting the change in the magnetic field of the permanent magnet strip. When the valve stem 2 is subjected to external force, it drives the sensing cap 55 to move, and the magnetic field distribution of the permanent magnet ring changes accordingly. The first sensor 53 determines whether the valve stem 2 has experienced abnormal displacement by detecting the change in magnetic field strength. The threaded connection between the sensing cap 55 and the valve stem 2 ensures that the permanent magnet ring moves synchronously with the valve stem 2. The depth design of the mounting groove 411 makes the surface of the permanent magnet strip flush with the outer circumference of the limiting shaft 41, avoiding motion interference. The Hall displacement sensor adopts a sensing surface arrangement parallel to the magnet axis, which can improve the magnetic field detection sensitivity.

[0054] Furthermore, this application proposes that the sensing monitoring device 5 is electrically connected to the signal processor. The signal processor is used to receive the detection signals from the first sensor 53 and the second sensor 54, and based on preset logic judgment, when the position signal of the second sensing element 52 is detected to be in the locking position where the limit shaft 41 abuts the top of the valve stem 2, and the position signal of the first sensing element 51 shows an upward movement, an illegal operation alarm signal is generated.

[0055] It can be understood that a signal processor refers to an integrated circuit module with data processing capabilities, specifically implemented using a microcontroller or programmable logic device. It is used to perform logical analysis of sensor signals and trigger alarm actions. The detection signal refers to a physical quantity signal reflecting the positional state of the valve stem 2 and the limit shaft 41. Specifically, it can be implemented by converting the magnetic field changes of the permanent magnet element, collected by a Hall displacement sensor, into an electrical signal for real-time monitoring of the valve stem 2's displacement state. The preset logic judgment refers to a pre-set condition triggering mechanism, specifically implemented using a threshold comparison algorithm or a state machine model. When abnormal displacement of the valve stem 2 is detected while the limit shaft 41 is locked, it is determined to be an illegal operation.

[0056] Specifically, when the unloading valve is closed, the limit shaft 41 moves to a locked position abutting the top of the valve stem 2 via the electric drive device 3. At this time, the second sensor 54 continuously monitors the position of the limit shaft 41, and the first sensor 53 simultaneously monitors the axial displacement of the valve stem 2. When the signal processor receives a signal from the second sensor 54 confirming that the limit shaft 41 is in the locked position, and simultaneously the first sensor 53 detects upward displacement of the valve stem 2, it determines that there is an illegal external force forcibly driving the valve stem 2, immediately generates an alarm signal, and triggers the audible and visual warning device. This judgment logic effectively distinguishes between normal operation and illegal prying scenarios. For example, in authorized operation, the limit shaft 41 will first release the locking state before allowing the valve stem 2 to move, while illegal operation is manifested as the valve stem 2 being forcibly lifted without the limit shaft 41 being released from its locking state.

[0057] Furthermore, this application proposes that the unloading valve body also includes an opening and closing mechanism 6 for driving the valve stem 2 to move up and down. The opening and closing mechanism 6 includes a handle 61, a rotating shaft 62 and a gear 63. One end of the rotating shaft 62 is fixedly connected to the handle 61, and the gear 63 is fixedly installed at the other end of the rotating shaft 62 that extends into the valve body 1. The gear 63 meshes with the rack portion 21 on the valve stem 2, converting the rotational motion of the rotating shaft 62 into the axial sliding motion of the valve stem 2.

[0058] It can be understood that the opening and closing mechanism 6 refers to the component that controls the displacement of the valve stem 2 through mechanical transmission. The handle 61 is a manually operated component, which can be a metal forging welded to the rotating shaft 62 to transmit rotational torque. The rotating shaft 62 is a metal shaft with a rotating function, which can be made of stainless steel and machined into a stepped shaft structure. One end is fixedly connected to the handle 61 via a keyway, and the other end is circumferentially positioned with the gear 63 via a flat key. The gear 63 is a transmission component with external teeth, which can be made using powder metallurgy to manufacture involute gears. The number of teeth is determined according to the ratio between the stroke of the valve stem 2 and the rotation angle of the handle 61, ensuring a balance between the operating torque and the moving speed of the valve stem 2. The rack section 21 is a strip-shaped recessed structure on the surface of the valve stem 2, which can be made by milling to form a continuous tooth structure. Its tooth pitch matches the module of the gear 63 to ensure the stability of the meshing transmission.

[0059] Specifically, when the handle 61 is rotated, the rotating shaft 62 drives the gear 63 to rotate synchronously. The gear 63 meshes with the rack portion 21 of the valve stem 2, generating relative displacement and converting the rotational motion into axial sliding of the valve stem 2. When the valve stem 2 moves upward, it compresses the return spring to open the oil drain port; when it moves downward, it returns to its original position and closes the oil drain port under the action of the return spring. The meshing accuracy between the gear 63 and the rack portion 21 is controlled by adjusting the installation clearance of the gear 63 to ensure that there is no jamming during the transmission process.

[0060] As a preferred embodiment, please refer to Figures 1 to 4 The specific implementation of this application plan is as follows:

[0061] An electric anti-theft unloading valve includes an unloading valve body and an electric anti-theft device. The electric anti-theft device is installed on the outer wall of the valve body 1 and is composed of an electric drive unit 3, a limiting device 4, and a sensing and monitoring device 5. The electric drive unit 3 is located inside a motor housing 31, which is fixedly installed on the outer wall of the valve body 1 and arranged adjacent to a sensing box 42. The electric drive unit 3 includes an electric mechanism 32 and a transmission mechanism 33. The output end of the electric mechanism 32 is connected to the transmission mechanism 33, and the output end of the transmission mechanism 33 is connected to the limiting shaft 41 of the limiting device 4. The limiting device 4 includes a limiting shaft 41 and a sensing box 42 installed on the valve body 1. The sensing box 42 has a shaft hole 43, through which the limiting shaft 41 movably passes. The limiting shaft 41 is connected to the output end of the electric drive unit 3 and can move axially under the drive of the electric drive unit 3, thereby achieving contact or disengagement with the top of the valve stem 2.

[0062] The transmission mechanism 33 consists of a first gear shaft 331, a second gear shaft 332, and a transmission shaft 44. The drive gears 333 of the first gear shaft 331 and the second gear shaft 332 mesh with each other. The end of the transmission shaft 44 closest to the electric mechanism 32 is fixedly connected to the first gear shaft 331 and is driven to rotate by the first gear shaft 331. A transmission shaft hole is provided on the valve body 1, and the transmission shaft 44 is rotatably mounted in the transmission shaft hole through a rolling bearing. The end of the transmission shaft 44 away from the electric mechanism 32 is provided with an external thread, and the limiting shaft 41 is provided with an internal thread hole that matches the external thread. The two are connected by thread to form a screw transmission structure. The electric mechanism 32 includes a magnetic induction element 321 and a drive motor 322. The output ends of the magnetic induction element 321 and the drive motor 322 are respectively connected to the first gear shaft 331 and the second gear shaft 332 to realize the power input to the transmission mechanism 33.

[0063] The sensing and monitoring device 5 of the electric anti-theft device includes a first sensing element 51, a second sensing element 52, a first sensor 53, and a second sensor 54. The first sensing element 51 is disposed on the valve stem 2, the second sensing element 52 is disposed on the limiting shaft 41, the first sensor 53 is installed on the sensing box 42 at the position corresponding to the first sensing element 51, and is used to monitor the position change of the first sensing element 51; the second sensor 54 is installed on the sensing box 42 at the position corresponding to the second sensing element 52, and is used to monitor the position change of the second sensing element 52. Specifically, the first sensing element 51 is a permanent magnet ring, and the upper end of the valve stem 2 is threadedly connected to a sensing cap 55. An annular groove 551 is formed on the inner side wall of the sensing cap 55, and the permanent magnet ring is embedded in the annular groove 551. The second sensing element 52 is a permanent magnet strip, and an installation groove 411 is formed on the outer peripheral wall of the limiting shaft 41, and the permanent magnet strip is embedded in the installation groove 411. Both the first sensor 53 and the second sensor 54 are Hall displacement sensors. The vertical sensing surface of the first sensor 53 is parallel to the axis of the first sensing element 51, and the sensing surface of the second sensor 54 is parallel to the axis of the second sensing element 52.

[0064] The unloading valve body also includes an opening and closing mechanism 6 for driving the valve stem 2 to move up and down. The opening and closing mechanism 6 consists of a handle 61, a rotating shaft 62, and a gear 63. One end of the rotating shaft 62 is fixedly connected to the handle 61, and the gear 63 is fixedly installed at the other end of the rotating shaft 62 that extends into the valve body 1. The gear 63 meshes with the rack portion 21 on the valve stem 2, which can convert the rotational motion of the rotating shaft 62 into the axial sliding motion of the valve stem 2.

[0065] During operation, the drive motor 322 of the electric mechanism 32 drives the transmission shaft 44 to rotate via the transmission mechanism 33, and the magnetic element 321 controls the number of rotations of the transmission shaft 44. The rotation of the transmission shaft 44 causes the limiting shaft 41 to move axially, allowing the lower end of the limiting shaft 41 to abut or disengage from the top of the valve stem 2, thereby limiting or releasing the stroke of the valve stem 2. When the limiting shaft 41 abuts the top of the valve stem 2, the valve stem 2 cannot move upward, and the unloading valve remains closed. When it is necessary to open the unloading valve, the drive motor 322 rotates in the opposite direction, driving the limiting shaft 41 to move upward, releasing the restriction on the valve stem 2.

[0066] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. An electric anti-theft unloading valve, comprising a valve body, a valve stem, and a valve disc, wherein the valve disc is fixedly connected to the lower end of the valve stem, and the valve stem can drive the valve disc to open or close by moving axially along the valve body, characterized in that, It also includes an electric anti-theft device, which is installed on the valve body and includes an electric drive device and a limiting device. The limiting device is connected to the output end of the electric drive device. The limiting device has a first position that locks the valve stem to prevent its axial movement so as to keep the valve disc in a closed state, and a second position that releases the lock on the valve stem so as to allow its axial movement.

2. The electric anti-theft unloading valve according to claim 1, characterized in that, The limiting device includes a limiting shaft and a sensing box disposed on the valve body; the sensing box has a shaft hole, the limiting shaft is movably inserted into the shaft hole, the limiting shaft is connected to the output end of the electric drive device, and moves axially under the drive of the electric drive device to abut or disengage from the top of the valve stem.

3. The electric anti-theft unloading valve according to claim 2, characterized in that, The electric drive device is located inside the motor housing, which is fixedly installed on the outer wall of the valve body and adjacent to the induction box. The electric drive device includes an electric mechanism and a transmission mechanism. The output end of the electric mechanism is connected to the transmission mechanism, and the output end of the transmission mechanism is drivenly connected to the limit shaft of the limit device.

4. The electric anti-theft unloading valve according to claim 3, characterized in that, The transmission mechanism includes a first gear shaft, a second gear shaft, and a drive shaft. The drive gears of the first gear shaft and the second gear shaft mesh with each other. The end of the drive shaft near the electric mechanism is fixedly connected to the first gear shaft and is driven to rotate by the first gear shaft.

5. The electric anti-theft unloading valve according to claim 4, characterized in that, The valve body is provided with a drive shaft hole, and the drive shaft is rotatably mounted in the drive shaft hole through a rolling bearing; the end of the drive shaft away from the electric mechanism is provided with an external thread, and the limiting shaft is provided with an internal thread hole that matches the external thread, and the drive shaft and the limiting shaft form a screw drive cooperation.

6. The electric anti-theft unloading valve according to claim 4, characterized in that, The electric mechanism includes a magnetic sensing element and a drive motor. The output end of the magnetic sensing element is connected to the first gear shaft, and the output end of the drive motor is connected to the second gear shaft.

7. The electric anti-theft unloading valve according to claim 2, characterized in that, The electric anti-theft device further includes a sensing and monitoring device, which includes a first sensing element, a second sensing element, a first sensor, and a second sensor. The first sensing element is disposed on the valve stem, the second sensing element is disposed on the limiting shaft, and the first sensor is installed on the sensing box at a position corresponding to the first sensing element to monitor the position change of the first sensing element. The second sensor is installed on the sensing box at a position corresponding to the second sensing element to monitor the position change of the second sensing element.

8. The electric anti-theft unloading valve according to claim 7, characterized in that, The first sensing element is a permanent magnet ring, and a sensing cap is threaded to the upper end of the valve stem. An annular groove is formed on the inner side wall of the sensing cap, and the permanent magnet ring is embedded in the annular groove. The second sensing element is a permanent magnet strip, and the outer peripheral wall of the limiting shaft is provided with a mounting groove, in which the permanent magnet strip is embedded; Both the first sensor and the second sensor are Hall displacement sensors. The first sensor is mounted on the sensing box, and its sensing surface is parallel to the axis of the first sensing element. The second sensor is mounted on the sensing box, and its sensing surface is parallel to the axis of the second sensing element.

9. The electric anti-theft unloading valve according to claim 7, characterized in that, The sensing and monitoring device is electrically connected to the signal processor. The signal processor is used to receive the detection signals from the first sensor and the second sensor, and based on preset logic, when it detects that the position signal of the second sensing element is in the locking position where the limit shaft abuts the top of the valve stem, and the position signal of the first sensing element shows an upward movement, it generates an illegal operation alarm signal.

10. The electric anti-theft unloading valve according to claim 1, characterized in that, It also includes an opening and closing mechanism for driving the valve stem to move up and down. The opening and closing mechanism includes a handle, a rotating shaft and a gear. One end of the rotating shaft is fixedly connected to the handle, and the gear is fixedly installed at the other end of the rotating shaft that extends into the valve body. The gear meshes with the rack on the valve stem to convert the rotational motion of the rotating shaft into the axial sliding motion of the valve stem.

Images