A load and unload vehicle selection control switch system

Abstract

This utility model belongs to the technical field of liquefied hydrocarbon loading and unloading, and in particular, a loading and unloading selection control switch system, comprising: a pipeline, with two pipelines, one for loading and one for unloading, for loading and unloading liquefied hydrocarbons; and a sensing mechanism, including a valve body installed on the pipeline and a valve stem rotatably mounted on the valve body. A changeover block is installed along the length of the valve stem, moving in a circular motion following the rotation of the valve stem. A proximity switch is positioned below the valve stem along the circular motion range of the changeover block, sensing the valve body's on / off state based on the changeover block's detection. This utility model has a simple structure. By the changeover block following the rotation of the valve stem, entering or moving away from the sensing area of ​​the proximity switch, the proximity switch detects the valve body's on / off state and sends a signal to the loading or unloading pneumatic control switch to activate the solenoid valve, thus realizing the loading or unloading of liquefied hydrocarbons. This fundamentally avoids the risks of material mixing and cross-contamination, and is convenient for users.

Description

Technical Field

[0001] This utility model relates to the field of liquefied hydrocarbon loading and unloading vehicle technology, and in particular to a loading and unloading vehicle selection control switch system. Background Technology

[0002] In the chemical logistics sector, the loading and unloading of liquefied hydrocarbons is a critical and high-frequency production process. This invention focuses on the intelligent control requirements for flexibly switching between loading and unloading functions at the same loading / unloading station. Existing technologies suffer from the following pain points: In the traditional operation mode, the liquefied hydrocarbon storage tank area is connected to the loading platform via a shared pipeline. Initially, only a loading system based on a batch controller (including pneumatic control valves) was configured, and accurate metering was achieved by preset loading quantities using IC cards. As business expanded and unloading requirements were added, although an independent unloading pipeline and compressor process were added, bidirectional transport via the same pipeline could not be achieved due to safety regulations. This necessitated a physically isolated dual-pipeline design—the loading pipeline is controlled by the batch controller, while the unloading pipeline runs directly to the storage tank. Under this architecture, each mode switch requires manual intervention in setting the status of two sets of pneumatic valves in the DCS system (closing / opening the loading valve during loading; and vice versa during unloading), posing significant operational risks.

[0003] Multi-station coordination dilemma: In large-scale operations where enterprises handle dozens of tank trucks daily, the frequent switching of modes when multiple loading and unloading positions are operating in parallel can easily lead to valve logic conflicts due to human error, resulting in material cross-flow or overpressure hazards. In existing technologies, DCS remote control relies on real-time communication confirmation between the central control room and on-site personnel. During peak operating periods, it is prone to instruction delays or information errors. Manual settings lack mechanical interlock protection, and when operators are distracted, it may cause the illegal operation of "two valves opening at the same time". Utility Model Content

[0004] In view of the deficiencies in the existing technology, the purpose of this utility model is to provide a loading and unloading vehicle selection control switch system, which uses a sensing actuator to trigger valve action by physical position signals to realize the loading and unloading of liquefied hydrocarbons.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A loading / unloading vehicle selection control switch system, comprising: The pipeline has two sections, namely a loading pipeline and an unloading pipeline, for loading and unloading liquefied hydrocarbons. The sensing mechanism includes a valve body installed on the pipeline and a valve stem rotatably mounted on the valve body. A changeover block that follows the rotation of the valve stem and makes a circular motion is installed along the length direction of the valve stem. A proximity switch that senses the opening and closing state of the valve body based on the changeover block is provided below the valve stem along the circumferential motion range of the changeover block. A solenoid valve is installed on the pipeline, and a control switch connected to the proximity switch signal is installed on the pipeline to execute the commands sent by the proximity switch.

[0006] As a preferred technical solution of this application, the thickness of the changing block is the same as that of the valve stem, and the changing block is L-shaped.

[0007] As a preferred technical solution of this application, a fixed seat for supporting the valve body is fixedly provided on the pipeline.

[0008] As a preferred technical solution of this application, the valve body is detachably mounted on the fixed seat.

[0009] As a preferred technical solution of this application, the control switch is divided into a loading pneumatic control switch and an unloading pneumatic control switch, and the unloading pneumatic control switch is installed on the loading pneumatic control switch.

[0010] As a preferred technical solution of this application, the bottom of the proximity switch is equipped with a bracket that can be detachably installed on the ground.

[0011] The loading and unloading vehicle selection control switch system described in this utility model has the following beneficial effects: 1. This solution changes the position of the stop block as it rotates with the valve stem, moving it into or away from the sensing area of ​​the proximity switch. The proximity switch detects the opening and closing status of the valve body and sends a signal to the loading pneumatic control switch or the unloading pneumatic control switch to activate the solenoid valve, thereby enabling the loading or unloading of liquefied hydrocarbons and fundamentally avoiding the risks of material cross-contamination and mixing. 2. This solution uses a manual ball valve operated by the operator to switch modes, avoiding the possibility of accidental operation of electrical buttons, and the operation intention is clear. Attached Figure Description

[0012] The present invention includes the following figures: The accompanying drawings are provided to better understand this utility model and do not constitute an undue limitation thereof. Wherein: Figure 1 This is a schematic diagram of the structure of the loading and unloading vehicle selection control switch system described in this utility model.

[0013] Figure 2 This is a schematic diagram of part A of the loading and unloading vehicle selection control switch system described in this utility model.

[0014] Figure 3 This is a schematic diagram of the principle of the loading and unloading vehicle selection control switch system described in this utility model.

[0015] The correspondence between the numbers in the attached diagram is as follows: 1-Pipeline; 2-Fixed seat; 201-Valve body; 202-Valve stem; 203-Change stop; 3-Bracket; 301-Proximity switch; 4-Loading pneumatic control switch; 5-Unloading pneumatic control switch. Detailed Implementation

[0016] The present invention will be further described in detail below with reference to the accompanying drawings. This detailed description is an illustration of exemplary embodiments of the present invention, including various details of these embodiments to aid understanding, and should be considered merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present invention. Similarly, for clarity and brevity, descriptions of well-known functions and structures are omitted in the following description.

[0017] As described in the background art, in the prior art, DCS remote control relies on real-time communication confirmation between the central control room and on-site personnel. During peak operation periods, it is prone to instruction delays or information omissions. Manual settings lack mechanical interlock protection, and when the operator's attention is distracted, it may cause the illegal operation of "two valves opening at the same time".

[0018] To solve this technical problem, this utility model provides a loading and unloading vehicle selection control switch system, which is applied to a control switch system that can trigger valve action through a sensing actuator using physical position signals to realize the loading and unloading of liquefied hydrocarbons.

[0019] Specifically, refer to Figures 1-3 As shown, a loading / unloading vehicle selection control switch system includes: Pipeline 1 has two parts, namely loading pipeline 1 and unloading pipeline 1, for loading and unloading liquefied hydrocarbons. The sensing mechanism includes a valve body 201 mounted on the pipeline 1 and a valve stem 202 rotatably mounted on the valve body 201. A change block 203 is mounted along the length of the valve stem 202 and moves in a circular motion following the rotation of the valve stem 202. A proximity switch 301 is provided below the valve stem 202 along the range of the circular motion of the change block 203, which senses the opening and closing state of the valve body 201 based on the change block 203. A solenoid valve is installed on pipeline 1. A control switch connected to the proximity switch 301 is installed on pipeline 1 to execute the commands sent by the proximity switch 301.

[0020] By cooperating with the change stop 203 and the proximity switch 301, non-contact sensing of the opening and closing status of the valve body 201 is achieved. When the valve stem 202 rotates, the change stop 203 on it moves into or out of the sensing area of ​​the proximity switch 301, triggering precise position signal feedback. This enables real-time and dynamic monitoring of the valve's operating status (such as fully open / fully closed), ensuring that the control system obtains accurate position information and reducing the risk of misjudgment.

[0021] Furthermore, in this embodiment, the thickness of the shift block 203 is the same as that of the valve stem 202. The shift block 203 is L-shaped, and the thickness of the shift block 203 and the valve stem 202 are the same. The movement trajectory of the shift block 203 maintains a constant distance from the sensing surface of the proximity switch 301. The vertical arm of the L-shaped structure can be fixed close to the side of the valve stem 202, while the horizontal arm extends outward to the sensing area of ​​the proximity switch 301. This orthogonal arrangement allows the block to be balanced by both the axial and radial forces of the valve stem 202.

[0022] Furthermore, in this embodiment, a fixed seat 2 is fixedly provided on the pipeline 1 to support the valve body 201. The valve body 201 is detachably installed on the fixed seat 2. When the valve body 201 malfunctions, it is not necessary to disassemble the entire fixed seat 2 or cut off the pipeline 1. Only the connection between the valve body 201 and the fixed seat 2 needs to be disconnected, and the valve body 201 can be removed separately for repair or replacement. Compared with the setting where the valve body 201 is fixed to the pipeline 1 as one piece, maintenance time can be saved.

[0023] like Figure 1 and Figure 2 As shown, the control switch is divided into a loading pneumatic control switch 4 and an unloading pneumatic control switch 5. The unloading pneumatic control switch 5 is installed on the loading pneumatic control switch 4. The bottom of the proximity switch 301 is equipped with a bracket 3 that can be detached from the ground.

[0024] The implementation principle of the loading and unloading vehicle selection control switch system in this application embodiment is as follows: In actual use, when it is necessary to load liquefied hydrocarbons, the connecting pipe of the vehicle body is connected to the pipeline 1. After the connection is completed, the valve body 201 is driven, causing the valve stem 202 to drive the shift block 203 to rotate in a circular motion. When the valve stem 202 rotates to a certain angle, usually in the fully open position, the shift block 203 will enter the sensing area of ​​the proximity switch 301. It is physically known that the valve body 201 is now in the open state, and this mechanical state is converted into an electrical signal and sent to the loading pneumatic control switch 4. The loading pneumatic switch opens the solenoid valve, thereby achieving the effect of loading liquefied hydrocarbons.

[0025] When unloading liquefied hydrocarbons, the connecting pipe of the vehicle body is connected to pipeline 1. After the connection is completed, the valve body 201 is driven, causing the valve stem 202 to rotate the shift block 203 in a circular motion. When the valve stem 202 rotates to a certain angle, usually in the fully closed position, the shift block 203 will leave the sensing area of ​​the proximity switch 301. Physically, it is known that the valve body 201 is now in the closed state, and this mechanical state is converted into an electrical signal and sent to the unloading pneumatic control switch 5. The unloading pneumatic switch opens the solenoid valve, and the liquefied hydrocarbons in the vehicle body can be unloaded through pipeline 1, thereby achieving the effect of loading liquefied hydrocarbons.

[0026] All structures in this application can be customized in terms of material and length according to actual usage. The attached drawings are schematic structural diagrams, and the actual dimensions can be adjusted accordingly.

[0027] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0028] The above description is only a preferred embodiment of the present utility model. The protection scope of the present utility model is not limited to the above embodiments. Any equivalent modifications or changes made by those skilled in the art based on the content disclosed in the present utility model should be included in the protection scope recorded in the claims.

Claims

1. A load / unload select control switch system characterized by, include: The pipeline has two sections, namely a loading pipeline and an unloading pipeline, for loading and unloading liquefied hydrocarbons. The sensing mechanism includes a valve body installed on the pipeline and a valve stem rotatably mounted on the valve body. A change block that follows the rotation of the valve stem and makes a circular motion is installed along the length direction of the valve stem. A proximity switch that senses the opening and closing state of the valve body based on the change block is provided below the valve stem along the circumferential motion range of the change block. A solenoid valve is installed on the pipeline, and a control switch connected to the proximity switch signal is installed on the pipeline to execute the commands sent by the proximity switch.

2. A load / unload selection control switch system according to claim 1, wherein The thickness of the shift block is the same as that of the valve stem, and the shift block is L-shaped.

3. The loading / unloading vehicle selection control switch system according to claim 1, characterized in that, A fixed seat is fixedly installed on the pipeline to support the valve body.

4. The loading / unloading vehicle selection control switch system according to claim 3, characterized in that, The valve body is detachably mounted on the fixed base.

5. The loading / unloading vehicle selection control switch system according to claim 1, characterized in that, The control switch is divided into a loading pneumatic control switch and an unloading pneumatic control switch, with the unloading pneumatic control switch being installed on the loading pneumatic control switch.

6. The loading / unloading vehicle selection control switch system according to claim 1, characterized in that, The proximity switch has a bracket at its bottom that can be detachably mounted to the ground.

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