A hand liquid adding gun driving mechanism and a hand liquid adding gun

Abstract

The utility model discloses a kind of manual liquid adding gun driving mechanism and manual liquid adding gun, wherein driving mechanism includes support, driving rod and force block, handle is rotatably installed in the both sides of the support by pin shaft, the force block is connected with the driving rod, the driving rod is penetrated in the support, the both sides of the force block are connected with handle respectively by connecting rod, the both ends of this connecting rod are rotatably connected with handle and force block, elastic member is arranged between force block and the support;Limiting mechanism for limiting handle rotation is arranged in the handle and matched with the connecting rod, and the limiting mechanism includes limiting block, and limiting protrusion is opened in connecting rod and matched with limiting block.The utility model is used to necessary limit for hand handle rotation, remind operator to have enough exhaust pressure relief time, after unlocking, handle can be further rotated, and gun is completed.

Description

Technical Field

[0001] This utility model relates to an LNG filling gun, specifically a manual filling gun drive mechanism and a manual filling gun. Background Technology

[0002] LNG filling nozzles are key devices used to fill liquefied natural gas into gas storage facilities (such as vehicle gas cylinders). Based on their driving method, they are mainly divided into two categories: pneumatic and manual. Among them, manual filling nozzles are still widely used in many application scenarios due to their advantages such as simple structure, no need for an external power source, and convenient maintenance.

[0003] The core of a manual refrigerant dispenser lies in its drive mechanism. Its typical operation involves the operator turning the handle on the dispenser, which transmits and amplifies the manual force through a linkage mechanism, thereby driving the internal driven components (such as the inner nozzle) to produce axial displacement. This displacement process achieves a sealed connection between the dispenser and the receiving port (dispensing the dispenser), and also controls the opening and closing of the internal valve for dispensing.

[0004] However, existing traditional manual refueling nozzle drive mechanisms have a significant safety hazard and operational flaw in practical use. This problem mainly occurs during the "nozzle retraction" process after refueling. Because LNG is highly volatile at room temperature, high-pressure gas may still remain in the internal pipeline of the refueling nozzle after refueling. A safe nozzle retraction process requires a sufficient "venting and depressurization" phase before completely disconnecting the sealing connection (i.e., final unlocking) to smoothly release the residual pressure inside the nozzle barrel.

[0005] Currently, this depressurization process relies entirely on the operator's experience and awareness. Traditional drive mechanisms are designed continuously, meaning the displacement of the handle corresponds directly and continuously to the displacement of the internal driven components, without any physical limits or sensory feedback. If the operator is unaware of this principle or is negligent, they may easily habitually pull the handle all the way down in one go, directly completing the unlocking and gun-retracting action, skipping the necessary depressurization pause.

[0006] This direct ejection of the nozzle due to insufficient pressure relief is extremely dangerous: the residual high-pressure gas inside the nozzle will propel the nozzle open the moment the locking mechanism is released, creating an impact. This could not only cause personal injury to the operator (such as from a collision), but also damage the nozzle itself and the expensive vehicle refueling interface, posing a serious safety hazard. Utility Model Content

[0007] Therefore, in order to solve the above-mentioned shortcomings, this utility model provides a manual liquid dispensing gun drive mechanism, which is used to limit the rotation of the handle, reminding the operator to have sufficient time for venting and depressurization, and only after unlocking can the handle be rotated further to complete the gun retraction.

[0008] Specifically, a manual dispensing gun drive mechanism includes a bracket, a drive rod, and a force transmission block. Handles are rotatably mounted on both sides of the bracket via pins. The force transmission block is connected to the drive rod, which passes through the bracket. Both sides of the force transmission block are connected to the handles via connecting rods, with each end of the connecting rod rotatably connected to the handle and the force transmission block, respectively. An elastic element is provided between the force transmission block and the bracket. A limiting mechanism matching the connecting rod and used to restrict the rotation of the handle is provided inside the handle. This limiting mechanism includes a limiting block and a limiting protrusion on the connecting rod that matches the limiting block. When the limiting block contacts the limiting protrusion, the handle is restricted from continuously rotating away from the dispensing gun head. When the limiting block separates from the limiting protrusion, the restriction on the handle is released.

[0009] By using the combination of the limiting block and the limiting protrusion, the operator can stop at a certain position when pulling the handle, ensuring sufficient venting and depressurization. The gun can only be withdrawn after unlocking (i.e., the limiting block and the limiting protrusion separate).

[0010] Optionally, the limiting mechanism further includes a mounting block, a handle, and a connecting rod. The mounting block is fixedly installed on the inside of the handle, the limiting block is slidably installed on the mounting block, one end of the connecting rod is connected to the limiting block, and the other end is connected to the handle, which is located on the inside of the handle.

[0011] The aforementioned technical features, by lifting and moving the connecting rod, which in turn moves the limiting block, thereby driving the limiting block and making it easier to make the limiting block contact or separate from the limiting protrusion.

[0012] Optionally, a reset elastic element that cooperates with the limiting block is fitted onto the connecting rod. The reset elastic element allows the limiting block to automatically reset, preventing the limiting mechanism from failing to function due to the operator forgetting to reset the limiting block.

[0013] Optionally, a protective cover is provided on the side of the mounting block closest to the force transmission block. The protective cover can prevent the limit block from being damaged by other equipment, thus protecting the limit block.

[0014] On the other hand, this utility model also provides a manual liquid dispensing gun, including the aforementioned manual liquid dispensing gun driving mechanism, wherein the driving rod is the inner barrel of the manual liquid dispensing gun or connected to the inner barrel, and the bracket is connected to the outer casing of the manual liquid dispensing gun through a support rod.

[0015] With the aforementioned drive mechanism, the manual liquid dispensing gun possesses the functions of that drive structure, thereby improving the safety of operators.

[0016] This utility model has the following advantages: The manual liquid dispensing gun drive mechanism of this utility model significantly improves the safety and standardization of operation through innovative limit design, forces a safety interval to ensure sufficient pressure relief, and provides a clear unlocking operation to prevent accidental operation.

[0017] By using the combination of the limiting block and the limiting protrusion, the handle is forced to stop at a specific position during the gun retraction process. This forcibly reminds and ensures that the operator has sufficient time to release air and pressure, effectively preventing equipment damage or personal injury accidents caused by residual pressure in the pipeline, and fundamentally improving operational safety.

[0018] This clearly divides the gun retraction process into two stages: the "pressure relief and limiting stage" and the "unlocking and retraction stage." The operator must actively perform the unlocking action (such as pulling the handle to separate the limiting block from the limiting protrusion) before continuing to turn the handle to complete the gun retraction. This two-step operating logic effectively prevents premature gun retraction due to operator negligence, forming a reliable operational interlock.

[0019] The integrated handle design incorporates the unlocking control mechanism (handle and connecting rod) inside the handle, allowing the operator to perform a smooth action of pressing down and pulling up to unlock with just one hand, making the operation very convenient and intuitive.

[0020] By setting the reset elastic element, the limit block can automatically return to the limit position after unlocking, avoiding the operator forgetting to reset and causing the limit function to fail during the next operation, thus ensuring that the mechanism can work reliably every time.

[0021] Meanwhile, the protective cover on the mounting block effectively prevents external objects from colliding and damaging the internal limit block, improving the durability and reliability of the mechanism in complex industrial environments. Furthermore, the entire drive mechanism, through connecting rods, pins, and other components, forms a stable lever system, ensuring efficient force transmission, robust mechanical structure, and long service life.

[0022] The manual dispensing gun, equipped with the aforementioned drive mechanism, inherits all its advantages. It internalizes the safety procedure of "ensuring depressurization time" into the equipment operation process through its mechanical structure, greatly reducing the risk of accidents caused by human error and providing crucial protection for operators and equipment. This dispensing gun guides and even "forces" operators to follow the safest procedure (depressurize first, then withdraw the gun), helping to cultivate and solidify correct operating habits and standardize the work process. It avoids the impact and wear on the dispensing gun itself and its interface caused by withdrawing the gun under pressure, helping to extend the service life of the dispensing gun and related equipment, and reducing maintenance costs and failure rates. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the manual liquid dispensing gun drive mechanism described in this utility model; Figure 2 This is a schematic diagram of the structure of the handle and the limiting mechanism described in this utility model. Figure 3 This is a three-dimensional structural diagram of the limiting mechanism; Figure 4 This is a schematic diagram of the limiting mechanism from another perspective; Figure 5 This is a three-dimensional structural diagram of the connecting rod; Figure 6 This is a schematic diagram of a manual liquid dispensing gun; In the diagram: 1. Handle; 2. Lifting handle; 3. Connecting rod; 4. Mounting block; 5. Limiting block; 51. Protective cover; 6. Connecting rod; 61. Limiting protrusion; 7. Elastic element; 8. Force transmission block; 9. Bracket; 10. Drive rod. Detailed Implementation

[0024] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0025] In this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, without necessarily requiring or implying any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0026] As described in the background section, the design of traditional drive mechanisms is continuous, meaning that the displacement of the handle and the displacement of the internal driven components are directly and continuously correlated, without any physical limits or sensory feedback in between. If operators are unaware of this principle or are negligent in their operation, they may easily habitually pull the handle all the way down in one go, directly completing the unlocking and gun retraction action, while skipping the necessary pressure relief pause.

[0027] This direct ejection of the nozzle due to insufficient pressure relief is extremely dangerous: the residual high-pressure gas inside the nozzle will propel the nozzle open the moment the locking mechanism is released, creating an impact. This could not only cause personal injury to the operator (such as from a collision), but also damage the nozzle itself and the expensive vehicle refueling interface, posing a serious safety hazard.

[0028] Based on the above reasons, the present invention provides the following embodiments.

[0029] Example 1: like Figures 1-5 As shown, a manual liquid dispensing gun drive mechanism includes a bracket 9, a drive rod 10, and a force transmission block 8. Handles 1 are rotatably mounted on both sides of the bracket 9 via pins. The force transmission block 8 is connected to the drive rod 10, which passes through the bracket 9. Both sides of the force transmission block 8 are connected to the handle 1 via connecting rods 6, with both ends of the connecting rods 6 rotatably connected to the handle 1 and the force transmission block 8, respectively. An elastic element 7 is provided between the force transmission block 8 and the bracket 9. A limiting mechanism matching the connecting rods 6 and used to restrict the rotation of the handle 1 is provided inside the handle 1. This limiting mechanism includes a limiting block 5 and a limiting protrusion 61 on the connecting rod that matches the limiting block. When the limiting block contacts the limiting protrusion, the handle is restricted from continuously rotating away from the liquid dispensing gun head. When the limiting block separates from the limiting protrusion, the restriction on the handle is released.

[0030] The aforementioned technical features, through the cooperation of the limiting block and the limiting protrusion, ensure that when the operator turns the handle, it pauses at a certain position, guaranteeing sufficient venting and pressure relief. The gun retraction can only be completed after unlocking (i.e., the limiting block and the limiting protrusion separate). This innovative limiting design significantly improves operational safety and process standardization, enforces a safety interval, ensures sufficient pressure relief, and provides a clear unlocking operation to prevent accidental actions. The cooperation of the limiting block and the limiting protrusion forces the handle to pause at a specific position during gun retraction. This mandatory reminder and requirement for the operator to allow sufficient time for venting and pressure relief effectively avoids equipment damage or personal injury accidents caused by residual pressure in the pipeline, fundamentally improving operational safety. The gun retraction process is clearly divided into two stages: the "pressure relief limiting stage" and the "unlocking and gun retraction stage." The operator must actively perform the unlocking action (such as pulling the handle to separate the limiting block and the limiting protrusion) before continuing to turn the handle to complete gun retraction. This two-step operation logic effectively prevents premature gun retraction due to operator negligence, forming a reliable operation interlock.

[0031] To ensure reliable installation and driving of the limiting block, in one embodiment, the limiting mechanism further includes a mounting block 4, a handle 2, and a connecting rod 3. The mounting block 4 is fixedly installed on the inner side of the handle 1, the limiting block 5 is slidably installed on the mounting block 4, one end of the connecting rod 3 is connected to the limiting block 5, and the other end is connected to the handle 2, which is located on the inner side of the handle 1.

[0032] The aforementioned technical features, through lifting and moving the connecting rod, which in turn moves the limiting block, thereby driving the limiting block and facilitating contact or separation between the limiting block and the limiting protrusion. This invention integrates the unlocking control mechanism (handle, connecting rod) inside the handle, allowing the operator to complete the continuous action of pressing down and pulling up to unlock with one hand, making operation very convenient and intuitive.

[0033] To achieve automatic reset of the limit block, in one embodiment, a reset elastic element 7 (such as a spring) that mates with the limit block 5 is fitted onto the connecting rod 3. The reset elastic element 7 allows the limit block 5 to automatically reset, preventing the operator from forgetting to reset the limit block, which could cause the limiting mechanism to malfunction. The reset elastic element ensures that the limit block automatically returns to its limit position after unlocking, preventing the operator from forgetting to reset and causing the limiting function to fail during the next operation, thus ensuring reliable operation of the mechanism every time.

[0034] To prevent the limiting block from being impacted, in one embodiment, a protective cover 51 is provided on the side of the mounting block near the force transmission block. The protective cover 51 can effectively prevent external objects from colliding and damaging the internal limiting block, thereby improving the durability and reliability of the mechanism in complex industrial environments.

[0035] Example 2: like Figure 6 As shown, a manual liquid dispensing gun includes the aforementioned manual liquid dispensing gun drive mechanism, wherein the drive rod is the inner barrel of the manual liquid dispensing gun or is connected to the inner barrel, and the bracket is connected to the outer casing of the manual liquid dispensing gun via a support rod.

[0036] With the aforementioned drive mechanism, the manual liquid dispensing gun possesses the functions of that drive structure, thereby improving the safety of operators.

[0037] Other structures of the manual liquid dispensing gun (excluding the structure of the drive mechanism) can be implemented with reference to the technical solution disclosed in the utility model patent with publication number CN212430437U entitled "A Manual Liquid Dispensing Gun"; or the technical solution disclosed in the utility model patent with publication number CN209622463U entitled "A Manual Liquid Dispensing Gun".

[0038] The manual dispensing gun equipped with the aforementioned drive mechanism inherits all its advantages, internalizing the safety procedure of "ensuring depressurization time" into the equipment operation process through its mechanical structure. This significantly reduces the risk of safety accidents caused by human error, providing crucial protection for operators and equipment. The dispensing gun guides and even "forces" operators to follow the safest procedure (depressurize first, then withdraw the gun), helping to cultivate and solidify correct operating habits and standardize the work process. It avoids the impact and wear on the dispensing gun itself and its interface caused by withdrawing the gun under pressure, helping to extend the service life of the dispensing gun and related equipment, reducing maintenance costs and failure rates.

[0039] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A manual liquid dispensing gun drive mechanism, characterized in that: The device includes a bracket, a drive rod, and a force transmission block. Handles are rotatably mounted on both sides of the bracket via pins. The force transmission block is connected to the drive rod, which passes through the bracket. Both sides of the force transmission block are connected to the handles via connecting rods, with each end of the connecting rod rotatably connected to both the handle and the force transmission block. An elastic element is provided between the force transmission block and the bracket. A limiting mechanism matching the connecting rod and restricting handle rotation is provided within the handle. This limiting mechanism includes a limiting block and a limiting protrusion on the connecting rod that matches the limiting block. When the limiting block contacts the limiting protrusion, it restricts the handle from continuously rotating away from the nozzle head. When the limiting block separates from the limiting protrusion, the restriction on the handle is released.

2. The manual liquid dispensing gun drive mechanism according to claim 1, characterized in that: The limiting mechanism also includes a mounting block, a handle, and a connecting rod. The mounting block is fixedly installed on the inside of the handle, and the limiting block is slidably installed on the mounting block. One end of the connecting rod is connected to the limiting block, and the other end is connected to the handle, which is located on the inside of the handle.

3. The manual liquid dispensing gun drive mechanism according to claim 2, characterized in that: A reset elastic element that cooperates with the limiting block is fitted onto the connecting rod.

4. The manual liquid dispensing gun drive mechanism according to claim 2, characterized in that: A protective cover is provided on the side of the mounting block closest to the force transmission block.

5. A manual liquid dispensing gun, characterized in that: Includes the manual dispensing gun drive mechanism as described in any one of claims 1-4, wherein the drive rod is the inner barrel of the manual dispensing gun or is connected to the inner barrel, and the bracket is connected to the outer casing of the manual dispensing gun via a support rod.

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