Spring energy storage type automatic fast connecting device with anti-pulling-off function

Abstract

The application discloses a spring energy storage type automatic quick connecting device with a function of preventing breakage. When a loading arm is connected with a tank car, the pushing force of a driving mechanism overcomes the elastic force of a cylindrical compression spring, the compression rod is pulled open through the sliding block, the annular homology block and the transmission rod, and after the loading arm is pushed to the target position, the driving mechanism no longer provides the driving force, the annular homology block and the sliding block are pushed to move rightwards by the elastic force of the cylindrical compression spring, the compression rod is pushed inwards to be tightened through the transmission rod, the compression block is pressed on the back of the LNG tank car interface flange, and the connecting process is completed. In the working process of the application, if the force of the loading arm exceeds the set value of the breakage valve, the breakage valve is disconnected from the middle part, the driving mechanism and the mounting plate are fixed on the right half of the breakage valve, other components are connected on the left half of the breakage valve, and there is no pipeline connected between the two parts. After the breakage, the two ends of the breakage valve are automatically closed, leakage accidents are prevented, the safety of the scene is ensured, and the loading arm is not secondarily damaged.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of connecting devices, in particular to a matched tool of a LNG land fluid loading arm, and especially to a spring energy storage type automatic quick connecting device with anti-pulling-off function. BACKGROUND

[0002] The land fluid loading arm is a key equipment connecting the site storage tank and the liquefied natural gas (hereinafter referred to as LNG) tank truck, and is usually connected with the LNG tank truck interface flange by using a loose flange. In order to prevent the pipeline from being broken and causing leakage accidents due to the tank truck sliding or other accidents, a pull-off valve is arranged before the loose flange. In recent years, with the development of science and technology, various automatic quick connecting devices are used to replace the loose flange and LNG tank truck to reduce the labor intensity of the operators. However, the automatic quick connecting device is installed at the end of the loading arm, and is connected with the upstream gas pipe, oil pipe or cable. When the pull-off valve is pulled off, the automatic quick connecting device and the pipeline connected with the upstream of the loading arm are still connected together, which is easy to cause secondary damage to the loading arm and cause leakage accidents. In addition, the existing connection mode has the problems of large operation difficulty and the like. SUMMARY

[0003] The present application aims at the problems existing in the prior art, and provides a spring energy storage type automatic quick connecting device with anti-pulling-off function.

[0004] The technical solution for realizing the present application is as follows: a spring energy storage type automatic quick connecting device with anti-pulling-off function, comprising a driving mechanism, a mounting plate, a pull-off valve and a pipeline for conveying LNG medium, wherein the driving mechanism is provided with a first proximity switch and a second proximity switch, and the driving rod of the driving mechanism is provided with a female joint at the front end; the driving mechanism is fixed on the mounting plate, the mounting plate is fixed on the right half of the pull-off valve, the right end of the pull-off valve is connected with the end of the loading arm, and the automatic quick connecting device is installed on the loading arm; and the left end of the pull-off valve is welded on the right end of the pipeline for conveying LNG medium.

[0005] The pipeline for conveying LNG medium is provided with a first fixing ring, a second fixing ring, a first cold insulation ring and a second cold insulation ring which are spaced apart and sleeved, the first fixing ring and the second fixing ring are fixedly connected with the pipeline for conveying LNG medium, the first cold insulation ring is tightly attached to the first fixing ring, and the second cold insulation ring is tightly attached to the second fixing ring.

[0006] The pipeline for conveying LNG medium is further provided with a sleeve, two ends of the sleeve are sleeved on the first cold insulation ring and the second cold insulation ring respectively, a plurality of grooves are uniformly distributed in the circumference of the sleeve, and one sliding rail assembly is installed in each groove.

[0007] The support seat is fixed on the docking flange, the docking flange is fixed on the left end of the pipeline for conveying LNG medium, and is used for docking with the LNG tank car interface flange; a plurality of forwardly extending guide rods for guiding and protecting the pressing rod are uniformly fixed on the cylindrical surface of the docking flange.

[0008] The sliding blocks are fixedly connected with annular synchronous blocks sleeved on the pipeline for conveying LNG medium, the annular synchronous blocks are used for synchronously sliding the plurality of sliding blocks along the axial direction of the pipeline; a cylindrical compression spring sleeved on the pipeline for conveying LNG medium is arranged between the annular synchronous blocks and the docking flange, a push rod is fixed on the annular synchronous block and located at the middle position between the two sliding blocks, and the push rod is opposite to the center of the concave joint.

[0009] Further, the sliding rail assembly comprises a fixed rail, a movable rail and a ball, and the movable rail is freely slidable within a stroke range relative to the fixed rail through the ball.

[0010] Further, the lower part of the sliding block is fixed on the movable rail.

[0011] Further, the front end surface of the docking flange is a sealing surface, and a sealing gasket is tightly attached to the sealing surface.

[0012] Further, the sealing gasket is provided with a mounting lug at a position corresponding to the guide rod, the mounting lug is provided with a mounting hole, and the guide rod passes through the mounting hole to tightly attach the sealing gasket to the sealing surface of the docking flange.

[0013] Further, the rear end surface of the docking flange is provided with an annular boss, the diameter of the boss is the same as the outer diameter of the sleeve, and the boss and the sleeve are respectively used for limiting the inner ring of the cylindrical compression spring at two ends.

[0014] Further, the part of the pressing rod between the support seat and the transmission rod is arc-shaped.

[0015] Further, the length direction of the guide rod is parallel to the axis of the pipeline for conveying LNG medium, and the inner side of the guide rod has a certain warping degree.

[0016] Further, the pull-off valve is a break pin type pull-off valve, and three break pins are arranged in the middle, when the pipeline is subjected to unexpected tension, the break pins are broken when the bearing force reaches the trigger threshold, the pull-off valve is divided into two parts, and the two ends of the separation surface are automatically closed.

[0017] Further, the sleeve is a hollow cylinder, and a plurality of rectangular grooves penetrating both ends are uniformly distributed on the outer side in the circumferential direction.

[0018] Further, the end of the cylindrical compression spring is in the form of two ends and is tight and flat.

[0019] Compared with the prior art, the present application has the following advantages:

[0020] (1) The quick connection device provided by the present application is designed for the LNG tank car interface flange, and can be installed at the end of the loading arm to replace the loose sleeve flange and the LNG tank car interface flange. When the quick connection device is connected with the LNG tank car interface flange, the control switch of the driving mechanism is turned on, the driving mechanism provides a pushing force to the left, the annular homopolar block overcomes the elastic force of the cylindrical compression spring through the push rod, and then drives the sliding block to move to the left, the sliding block pulls the compression rod to open through the transmission rod, and then pulls the loading arm to the docking position, so that the sealing gasket of the quick connection device is basically attached to the sealing surface of the LNG tank car interface flange. Then, the control switch of the driving mechanism is closed, and the driving mechanism no longer provides driving force, the elastic force of the cylindrical compression spring pushes the annular homopolar block to drive the sliding block to move to the right, the sliding block drives the compression rod to tighten through the transmission rod, so that the compression block is tightly pressed against the back of the LNG tank car interface flange, and the docking is completed. The whole device is simple and fast to operate, reduces the labor intensity, shortens the connection time, and improves the work efficiency.

[0021] (2) The quick connection device provided by the present application guarantees reliable connection and no leakage through the elastic force of the cylindrical compression spring, the elastic force of the spring is stable and reliable, has good anti-vibration performance, and does not need to provide additional power, and is less affected by environmental factors.

[0022] (3) The quick connection device provided by the present application has a pull-off prevention function. If the loading arm is subjected to a large force due to tank car rolling or other reasons, the loading arm will be broken from the middle of the pull-off valve. After being broken, the two ends of the pull-off valve are automatically closed to prevent leakage accidents and ensure safety on site. The concave joint installed on the driving mechanism is automatically separated from the push rod installed on the annular homopolar block, the driving mechanism and the mounting plate are fixed on the right half of the pull-off valve, and other components are connected on the left half of the pull-off valve, and there is no pipeline connected between the two parts, so that the automatic quick connection device will not cause secondary damage to the loading arm due to the incomplete breakage of the two parts.

[0023] The present application will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1It is a three-dimensional structure diagram of a spring energy storage type automatic quick connecting device with anti-pulling-off function in an embodiment.

[0025] Figure 2 It is a semi-perspective view of the present application in an embodiment.

[0026] Figure 3 It is Figure 1 It is a structure diagram of a slide rail assembly in the embodiment.

[0027] Figure 4 It is Figure 1 It is a structure diagram of a sleeve in the embodiment.

[0028] Figure 5 It is Figure 1 It is a structure diagram of a sealing gasket in the embodiment.

[0029] Figure 6 It is a diagram of the present application when it is ready to butt joint with the flange of the LNG tank truck in an embodiment.

[0030] Figure 7 It is a diagram of the present application when it is moved to the position of the flange of the LNG tank truck in an embodiment.

[0031] Figure 8 It is a diagram of the present application when it is butt jointed with the flange of the LNG tank truck in an embodiment.

[0032] In the figure: driving mechanism 1, mounting plate 2, pull-off valve 3, pipeline 4 for conveying LNG medium, first fixed ring 5-1, second fixed ring 5-2, first cold insulation ring 6-1, second cold insulation ring 6-2, sleeve 7, slide rail assembly 8, sliding block 9, transmission rod 10, pressing rod 11, support seat 12, pressing block 13, sealing gasket 14, guide rod 15, butt joint flange 16, cylindrical compression spring 17, annular homopolar block 18, push rod 19, flange of tank truck 40 DETAILED DESCRIPTION

[0033] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0034] It should be noted that if the present application embodiments involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement condition, etc. between the components in a certain posture (as shown in the drawings), if the certain posture changes, the directional indications also change accordingly.

[0035] In addition, if the description of "first", "second" and the like is involved in the embodiments of the present application, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can be explicitly or implicitly included at least one of the features. In addition, the technical solutions of various embodiments can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist, nor in the protection scope required by the present application.

[0036] In one embodiment, in combination Figure 1 and Figure 2 , a spring energy automatic fastening device with anti-breaking function is provided, which comprises a driving mechanism 1, the driving mechanism 1 is provided with a first proximity switch 1-1 and a second proximity switch 1-2, and a concave joint 1-3 is installed at the front end of the driving rod. The driving mechanism 1 is fixed on the mounting plate 2, the mounting plate 2 is fixed on the right half of the breaking valve 3, the right end of the breaking valve 3 is connected with the end of the loading arm, which is used to install the present application on the loading arm, and the left end is welded on the right end of the pipeline 4 for conveying LNG medium, the first fixed ring 5-1, the second fixed ring 5-2, the first cold separation ring 6-1 and the second cold separation ring 6-2 are arranged on the pipeline 4 (preferably the middle section of the pipeline), the first fixed ring 5-1 and the second fixed ring 5-2 are fixedly connected with the pipeline 4 respectively, the first cold separation ring 6-1 is closely attached to the first fixed ring 5-1, and the second cold separation ring 6-2 is closely attached to the second fixed ring 5-2.

[0037] A sleeve 7 is also arranged on the pipeline 4, the two ends of the sleeve 7 are sleeved on the first cold separation ring 6-1 and the second cold separation ring 6-2 respectively, and the length of the sleeve 7 is equal to the distance between the two cold separation rings. Since the first cold separation ring 6-1 and the second cold separation ring 6-2 are blocked by the first fixed ring 5-1 and the second fixed ring 5-2 respectively, the sleeve 7 cannot move along the axial direction of the pipeline 4, but can only rotate around the axis of the pipeline 4.

[0038] As shown in Figure 4 , the sleeve 7 is uniformly distributed with four rectangular grooves penetrating through both ends, and one sliding rail assembly 8 is installed in each groove. As shown in Figure 3 , the sliding rail assembly includes a fixed rail 8-1, a movable rail 8-2 and a ball 8-3. A sliding block 9 is fixed on the movable rail 8-2, a transmission rod 10 is connected with the sliding block 9 through a pin shaft, a pressing rod 11 is connected with the other end of the transmission rod 10 through a pin shaft, a support seat 12 is connected with the middle part of the pressing rod 11 through a pin shaft, and a pressing block 13 for pressing the LNG tank car flange 40 during docking is connected with the free end of the pressing rod 11. Preferably, the part of the pressing rod 11 between the support seat 12 and the transmission rod 10 is arc-shaped.

[0039] The support base 12 is fixed on the butt flange 16 which is fixed on the left end of the pipeline 4 for butt joint with the LNG tank truck interface flange 40.

[0040] Four forward extending guide rods 15 for guiding and protecting the pressing rod are fixed on the cylindrical surface of the butt flange 16 uniformly in the circumferential direction. The length direction of the guide rod 15 is parallel to the axis of the pipeline 4, and the inner side of the guide rod 15 has a certain warping degree. By means of the guiding effect of the guide rod 15, when the quick connecting device moves to the target position, the butt flange 16 is substantially parallel to the LNG tank truck interface flange 40.

[0041] The front end surface of the butt flange 16 is a sealing surface, and the sealing gasket 14 is tightly attached to the sealing surface. As shown in the figure, the sealing gasket 14 is provided with mounting ears at the positions corresponding to the guide rods 15, and mounting holes are arranged on the mounting ears. The guide rods pass through the mounting holes to tightly attach the sealing gasket to the sealing surface of the butt flange 16. When the butt flange 16 is substantially parallel to the LNG tank truck interface flange 40, the sealing gasket 14 is substantially attached to the sealing surface of the LNG tank truck interface flange 40. Figure 5

[0042] The annular homopolar block 18 sleeved on the pipeline 4 is fixedly connected with the four sliding blocks 9, so that the four sliding blocks can synchronously slide along the pipeline axis. The cylindrical compression spring 17 is located between the mounting flange 16 and the annular homopolar block 18. The rear end surface of the butt flange 16 is provided with an annular boss, and the diameter of the boss is the same as the outer diameter of the sleeve 7. The boss and the sleeve 7 respectively limit the inner rings of the two ends of the cylindrical compression spring 17. The annular homopolar block 18 is fixed with a push rod 19 at the middle position of the two sliding blocks, and the push rod 19 is opposite to the center of the female joint 1-3.

[0043] Since the support base 12 is fixed on the butt flange 16, the pressing rod 11 is hinged with the support base 12, one end of the transmission rod 10 is hinged with the pressing rod 11, and the other end is hinged with the sliding block 9. The sliding block 9 is fixed on the movable rail 8-2, and the fixed rail is fixed on the sleeve 7. Therefore, after assembly, the sleeve 7 can no longer rotate and is relatively stationary with the pipeline 4.

[0044] The working principle of the application is as follows:

[0045] ​The utility model discloses a spring energy storage type automatic quick connecting device with anti-breaking function, when the loading arm needs to be connected with the tank car, first, the control switch of the driving mechanism is opened, the driving mechanism 1 starts to work, the driving rod continues to push out to the left after overcoming the elastic force of cylindrical compression spring 17, pushes the push rod 19 to move to the left through the female joint 1-3, the push rod 19 drives the annular homology block 18 to move to the left, further compresses cylindrical compression spring 17, and the annular homology block 18 drives four sliders 9 to slide to the left synchronously, the slider 9 pulls the compression rod 11 to open synchronously through the transmission rod 10, when the first proximity switch 1-1 is connected, it indicates that the driving mechanism 1 is pushed to the position, and the compression rod 11 has been completely opened, then the loading arm is pulled to the preparation position, as shown in the figure. Figure 6 Slowly push the loading arm to the left, and rely on the guiding effect of the guide rod 15 to make the quick connecting device move to the target position, as shown in the figure. Figure 7 At this time, the connecting flange 16 is basically parallel with the LNG tank car interface flange 40, and the sealing gasket 14 is basically attached to the sealing surface of the LNG tank car interface flange 40.

[0046] At this time, the control switch of the driving mechanism 1 is closed, the driving mechanism 1 stops working, and no driving force is provided, the elastic force of the cylindrical compression spring 17 pushes the annular homology block 18 to move to the right, the annular homology block 18 drives four sliders 9 to slide to the right synchronously, the slider 9 pushes the compression rod 11 to tighten inward synchronously through the transmission rod 10, and the compression block 13 installed at the free end of the compression rod 11 is pressed on the back of the LNG tank car interface flange 40. At the same time, the annular homology block 18 drives the push rod 19 to push the female joint 1-3 to move to the right, when the second proximity switch 1-2 is connected, it indicates that the cylindrical compression spring 17 moves to the right to the position, and the compression process is completed, and the elastic force of the cylindrical compression spring 17 ensures the reliability of the connection, as shown in the figure. Figure 8

[0047] Since the LNG tank car interface flange 40 is fixed on the tank car and cannot be moved, the reaction force of the LNG tank car interface flange 40 on the compression block 13 will pull the loading arm to move to the left through the quick connecting device, so that the loading arm is connected with the LNG tank car interface flange 40, as shown in the figure. Figure 8 During the right extension of the cylindrical compression spring 17, although the elastic force provided is gradually reduced, through design, the elastic force provided after the extension to the position is still sufficient to ensure that the connecting surface is sealed well, and there is no leakage.

[0048] ​The pull-off valve 3 is the weak link of the automatic quick coupling device and the whole loading arm. In the working process of the automatic quick coupling device, if the tank car slips or other reasons cause the loading arm to bear a larger force, which exceeds the set value of the pull-off valve, the loading arm will be disconnected from the middle of the pull-off valve. After disconnection, the two ends of the pull-off valve are automatically closed to prevent leakage accidents and ensure safety on site. The concave joint 1-3 is automatically separated from the push rod 19, the driving mechanism 1 and the mounting plate 2 are fixed on the right half of the pull-off valve, and other components are connected on the left half of the pull-off valve. There is no pipeline connection between the two parts, and the automatic quick coupling device will not cause secondary damage to the loading arm due to the failure of the two parts to completely disconnect.

[0049] The basic principles, main features and advantages of the present application are shown and described above. Those skilled in the art should understand that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principles of the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A spring-energy-storing automatic quick-connect device with anti-breakage function, characterized in that, The device includes a drive mechanism, a mounting plate, a breakaway valve, and a pipeline for conveying LNG. The drive mechanism is equipped with a first proximity switch and a second proximity switch, and a concave connector is installed at the front end of the drive rod of the drive mechanism. The drive mechanism is fixed to the mounting plate, and the mounting plate is fixed to the right half of the breakaway valve. The right end of the breakaway valve is connected to the end of the loading arm for installing the automatic quick-connect device on the loading arm. The left end of the breakaway valve is welded to the right end of the pipeline for conveying LNG. The pipeline for transporting LNG is provided with a first fixed ring, a second fixed ring, a first cold insulation ring, and a second cold insulation ring at intervals. The first fixed ring and the second fixed ring are respectively fixedly connected to the pipeline for transporting LNG. The first cold insulation ring is in close contact with the first fixed ring, and the second cold insulation ring is in close contact with the second fixed ring. The pipeline for transporting LNG is also equipped with a sleeve, with its two ends fitted onto a first cold insulation ring and a second cold insulation ring, respectively. The sleeve has several grooves evenly distributed around its circumference, and a slide rail assembly is installed in each groove. A slider is fixed on each slide rail assembly. The upper end of the slider is hinged to one end of a transmission rod, and the other end of the transmission rod is hinged to one end of a clamping rod. The middle part of the clamping rod is hinged to a support seat, and the other end of the clamping rod is connected to a clamping block for clamping the LNG tank truck interface flange during docking. The support base is fixed on the docking flange, which is fixed to the left end of the pipeline for transporting LNG medium and is used to dock with the LNG tank truck interface flange; several forward-extending guide rods for guiding and protecting the clamping rod are uniformly fixed on the cylindrical surface of the docking flange. The sliders are all fixedly connected to the annular coordinating blocks fitted on the pipeline for transporting LNG. The annular coordinating blocks are used to make several sliders slide synchronously along the pipeline axis. A cylindrical compression spring fitted on the pipeline for transporting LNG is provided between the annular coordinating block and the docking flange. A push rod is fixed on the annular coordinating block at the middle position between the two sliders. The push rod is directly opposite the center of the concave joint.

2. The spring-energy-storing automatic quick-connect device with anti-breakage function according to claim 1, characterized in that, The slide rail assembly includes a fixed rail, a movable rail, and ball bearings. The movable rail can slide freely relative to the fixed rail within its travel range via the ball bearings.

3. The spring-energy-storing automatic quick-connect device with anti-breakage function according to claim 2, characterized in that, The lower part of the slider is fixed on the movable rail.

4. The spring-energy-storing automatic quick-connect device with anti-breakage function according to claim 1, characterized in that, The front end face of the mating flange is the sealing surface, and a sealing gasket is tightly fitted onto the sealing surface.

5. The spring-energy-storing automatic quick-connect device with anti-breakage function according to claim 4, characterized in that, The gasket has a mounting ear at a position corresponding to the guide rod, and the mounting ear has a mounting hole. The guide rod passes through the mounting hole to tightly fit the gasket onto the sealing surface of the mating flange.

6. The spring-energy-storing automatic quick-connect device with anti-breakage function according to claim 1, characterized in that, The rear end face of the docking flange is provided with an annular boss, the diameter of which is the same as the outer diameter of the sleeve. Both are used to limit the inner rings at both ends of the cylindrical compression spring.

7. The spring-energy-storing automatic quick-connect device with anti-breakage function according to claim 1, characterized in that, The portion of the clamping rod located between the support base and the transmission rod is arc-shaped.

8. The spring-energy-storing automatic quick-connect device with anti-breakage function according to claim 1, characterized in that, The length of the guide rod is parallel to the axis of the pipeline transporting LNG, and the inner side of the guide rod has a certain degree of warping.

9. The spring-energy-storing automatic quick-connect device with anti-breakage function according to claim 1, characterized in that, The pull-off valve is a break-off pin type pull-off valve with three break-off pins in the middle. When the pipeline is subjected to unexpected tension, the break-off pins will break when the force reaches the trigger threshold, and the pull-off valve will split into two, with both ends of the separation surface automatically sealing.

10. The spring-energy-storing automatic quick-connect device with anti-breakage function according to claim 1, characterized in that, The sleeve is a hollow cylinder with several rectangular grooves that penetrate both ends evenly distributed along its outer circumference.

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