Safe loading and unloading device capable of preventing liquid nitrogen leakage

Abstract

The invention discloses a liquid nitrogen leakage-proof safe loading and unloading device which comprises a stand column stably placed in a working area, the right side face of the stand column is connected with a vertical pipe through a supporting frame, the lower end of the vertical pipe is connected with an inner arm, and the right end of the inner arm is connected with an outer arm through a rotating connector. A spring cylinder used for adjusting the rotation angle of the outer arm is installed on the rear side of the outer arm, and the right end of the outer arm is connected with a discharge pipe. According to the safe loading and unloading device capable of preventing liquid nitrogen leakage, the stretched protective hose is arranged on the outer side of the connecting flange in a sleeving mode, then the outer side of the connecting flange is conveniently shielded and protected, if liquid nitrogen leaks from the connecting flange, the protective hose can collect the leaked liquid nitrogen, and the leaked liquid nitrogen is prevented from flowing to the ground; and four groups of pushing unfolding plates enable the inner shielding cloth to be unfolded inwards, so that the liquid nitrogen collected in the protection hose can be prevented from flowing outwards, and the leaked liquid nitrogen can be further protected.

Description

Technical Field

[0001] The invention relates to the technical field of liquid nitrogen loading and unloading, and in particular to a liquid nitrogen leakage-proof safety loading and unloading device. Background Art

[0002] Liquid nitrogen is a cryogenic medium. When loading and unloading liquid nitrogen, a loading and unloading device is required. The loading and unloading device is a fluid loading and unloading equipment specially designed for the safe and efficient transportation of liquid nitrogen. The rigid connecting pipes in the loading and unloading device replace the traditional hoses to prevent liquid nitrogen leakage during loading and unloading. For example, the patent disclosed in the prior art with the announcement number "CN111498786A" is named "A Loading and Unloading Crane Pipe", which discloses that the column is arranged in the vertical direction, the feed pipe is located in the column, and the upper end of the feed pipe is lower than the upper end of the column, the inner arm rotary joint is located in the column and connected to the upper end of the feed pipe, the connecting flange is fixedly sleeved on the outside of the inner arm, the connecting flange is connected to the outer ring of the rotary drive through a plurality of bolts, and the plurality of bolts are distributed at intervals along the circumference of the connecting flange. The bolts pass through the connecting flange and cooperate with the threaded holes on the outer ring to connect the connecting flange to the outer ring, thereby realizing the connection between the inner arm and the outer ring, and the prior art announcement number "C The patent disclosed in "N208471519U" is titled "A Loading and Unloading Arm for Liquid Nitrogen Transport". It discloses that the lower end of the outer arm is a liquid inlet, and an inlet flange is provided between the liquid inlet and the liquid infusion pipe. After the liquid infusion pipe is connected to the liquid inlet, the inlet flange is tightened to fix it. The outer arm and the column are fixed with tightening bolts. The tightening bolts are respectively fixed at the upper, middle and lower parts of the outer arm. The outer arm is connected to the first inner arm with an outer arm joint. The liquid outlet is provided with an outlet flange for connecting a hose. A lifting rotator is provided between the liquid outlet and the reducer. The lifting rotator is a gear structure. Rotating the lifting rotator can raise or lower the height of the liquid outlet.

[0003] When the above-mentioned safety loading and unloading device in the prior art is in use, its internal liquid inlet and liquid outlet are connected to the external pipeline through flanges. Since the connection is only through the flange, if the sealing structure inside the flange is damaged during use, it will cause liquid nitrogen at the liquid inlet and liquid outlet to leak, thereby affecting the subsequent safe loading and unloading operations. Therefore, we propose a liquid nitrogen leakage-proof safety loading and unloading device to solve the above-mentioned problems. Summary of the Invention

[0004] The object of the present invention is to provide a safe loading and unloading device for preventing leakage of liquid nitrogen, so as to solve the problem of the safe loading and unloading device currently on the market proposed in the background art, in which the liquid inlet and liquid outlet of the device are connected to the external pipeline through flanges when in use. Since the connection is only through the flanges, if the sealing mechanism inside the flanges is damaged during use, the liquid nitrogen at the liquid inlet and liquid outlet will leak, thereby affecting the subsequent safe loading and unloading operations.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: a liquid nitrogen leakage-proof safe loading and unloading device, comprising a column for being stably placed in a working area, wherein the right side of the column is connected to a vertical pipe via a support frame, and the lower end of the vertical pipe is connected to an inner arm, an inlet pipe is installed below the left end of the inner arm, and the right end of the inner arm is connected to the outer arm via a rotary joint, and a spring cylinder for adjusting its rotation angle is installed on the rear side of the outer arm, the right end of the outer arm is connected to a discharge pipe, and the outer sides of the inlet pipe and the discharge pipe are both provided with a shielding protection mechanism.

[0006] Preferably, the outer ends of the inlet pipe and the discharge pipe are fixed with connecting flanges, the left end of the fixing frame fixed above the inner arm is connected to the vertical pipe, the front side of the outer arm is connected to the joint purge port, and the left end of the joint purge port is installed with a control valve.

[0007] Preferably, the shielding protection mechanism includes a protective hose, a fixed ring and a movable ring which are sleeved on the outside of the inlet pipe and the discharge pipe. One side of the fixed ring is connected to the movable ring through a manual telescopic rod. The manual telescopic rod is arranged on the outside of the protective hose. One end of the protective hose is connected to the fixed ring fixed on the outside of the inlet pipe and the discharge pipe, and the other end of the protective hose is connected to the movable ring.

[0008] Preferably, the inner diameter of the movable ring and the inner diameter of the end of the protective hose away from the fixed ring are both larger than the inner diameter of the fixed ring.

[0009] Preferably, a gravity sensor is installed on one side below the movable ring, a protective hose is provided above the gravity sensor, there is a distance between the protective hose and the gravity sensor, and a corresponding manual telescopic rod is provided below the gravity sensor.

[0010] Preferably, an alarm is installed on the top of the column.

[0011] Preferably, an inner shielding cloth in the shape of a circular ring is installed on the inner side wall of the movable ring.

[0012] Preferably, the interior of the movable ring is grooved at equal intervals to install an air storage tube, one end of the air storage tube is fitted with a piston assembly, and the piston assembly is connected to the air storage tube through a spring, and the other end of the piston assembly is connected to the push-to-expand plate, and the push-to-expand plate is arranged in an arc shape, and one side of the push-to-expand plate is bonded to the outer side of the inner shielding cloth, and the inner shielding cloth is made of umbrella cloth.

[0013] Through the arrangement of the above structure, the inner shielding cloth can effectively shield the left side of the movable ring, thereby preventing the liquid nitrogen in the protective hose from flowing out.

[0014] Preferably, the right side of the gas storage tube is connected to the gas storage airbag through a connecting tube, and an extrusion plate is fixed to the left side of the gas storage airbag. The connecting tube is made of the same material as the protective hose, and the right end of the connecting tube passes through the interior of the extrusion plate.

[0015] The above structure allows the connecting pipe to be stretched, making it easier to use later. Preferably, one side of the extrusion plate is slidably connected to a guide column installed in the movable ring, and the other side of the extrusion plate is connected to a connecting rope, the right end of the connecting rope passes through the right side of the movable ring and is connected to the fixed ring.

[0016] By setting the above structure, the connecting rope can drive the extrusion plate to move, thereby facilitating the extrusion plate to squeeze the air storage airbag.

[0017] Compared with the prior art, the beneficial effects of the present invention are: when the liquid nitrogen anti-leakage safety loading and unloading device is in use, the protective hose can collect the leaked liquid nitrogen, preventing the leaked liquid nitrogen from flowing to the ground, so as to facilitate the collection of the leaked liquid nitrogen later. The specific contents are as follows: The stretched protective hose is placed on the outside of the connecting flange, which facilitates shielding and protecting the outside of the connecting flange. If liquid nitrogen leaks from the connecting flange, the protective hose can collect the leaked liquid nitrogen to prevent it from flowing to the ground, making it easier to collect the leaked liquid nitrogen later. Furthermore, by setting up the protective hose, the leaked liquid nitrogen will drive the lower surface of the protective hose to move downward, and then contact the gravity sensor below, so that the gravity sensor can detect the leakage in time, and the alarm can sound in time to alert the surrounding staff; (2) When the moving ring moves outward, the squeezing plate is pulled by the connecting rope, and the squeezing plate squeezes the air storage bag, so that the gas in the air storage bag enters the air storage pipe through the connecting pipe, and then the piston assembly in the air storage pipe drives the arc-shaped push-expanding plate to move inward. The four groups of push-expanding plates expand the inner shielding cloth inward, thereby preventing the liquid nitrogen collected in the protective hose from flowing out, and further protecting the leaked liquid nitrogen. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a left-side structural schematic diagram of the present invention; Figure 3 This is a schematic diagram of the three-dimensional structure of the inlet pipe of the present invention; Figure 4 This is a schematic diagram of the separation structure of the inlet pipe and the fixing ring of the present invention; Figure 5This is a schematic diagram of the cross-sectional structure of the protective hose of the present invention; Figure 6 For the present invention Figure 5 A in the middle is an enlarged structural diagram; Figure 7 This is a schematic diagram of the structure of the push-to-expand plate of the present invention; Figure 8 For the present invention Figure 7 The enlarged structural diagram at B in the middle; Figure 9 This is a schematic diagram of the cross-sectional structure of the gas storage pipe of the present invention; Figure 10 This is a schematic diagram of the separation structure of the movable ring and the protective hose of the present invention; Figure 11 This is a schematic cross-sectional view of the connection between the movable ring and the inner shielding cloth of the present invention; Figure 12 It is a schematic diagram of the three-dimensional structure of the inner shielding cloth of the present invention.

[0019] In the figure: 1. Column; 2. Support frame; 3. Vertical pipe; 4. Fixed frame; 5. Inlet pipe; 51. Connecting flange; 6. Inner arm; 7. Outer arm; 8. Rotary joint; 9. Spring cylinder; 10. Discharge pipe; 11. Joint purge port; 12. Control valve; 13. Moving ring; 131. Gravity sensor; 14. Alarm; 15. Fixed ring; 16. Manual telescopic rod; 17. Protective hose; 18. Inner shielding cloth; 19. Gas storage pipe; 191. Piston assembly; 20. Push deployment plate; 21. Squeeze plate; 211. Gas storage airbag; 212. Connecting rope; 213. Guide column; 214. Connecting pipe. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0021] See also Figures 1-12 , the present invention provides the following technical solutions: Example 1: The liquid nitrogen anti-leakage safety loading and unloading device in this embodiment can collect the leaked liquid nitrogen and issue an alarm in time to facilitate timely processing by the staff to prevent the leaked liquid nitrogen from flowing to the ground. The specific structure is shown in the attached figure. Figure 1-Figure 7As shown, it includes a column 1 for being stably placed in the working area, and the right side of the column 1 is connected to the vertical pipe 3 through the support frame 2, and the lower end of the vertical pipe 3 is connected to the inner arm 6, an inlet pipe 5 is installed below the left end of the inner arm 6, and the right end of the inner arm 6 is connected to the outer arm 7 through a rotating joint 8, and a spring cylinder 9 for adjusting the rotation angle of the outer arm 7 is installed on the rear side of the outer arm 7, the right end of the outer arm 7 is connected to the discharge pipe 10, and the outer sides of the inlet pipe 5 and the discharge pipe 10 are both provided with a shielding protection mechanism.

[0022] The outer ends of the inlet pipe 5 and the discharge pipe 10 are fixed with a connecting flange 51. The left end of the fixing frame 4 fixed above the inner arm 6 is connected to the vertical pipe 3. The front side of the outer arm 7 is connected to the joint purge port 11. The left end of the joint purge port 11 is installed with a control valve 12. The shielding protection mechanism includes a protective hose 17, a fixed ring 15 and a movable ring 13 sleeved on the outside of the inlet pipe 5 and the discharge pipe 10. One side of the fixed ring 15 is connected to the movable ring 13 through a manual telescopic rod 16. The manual telescopic rod 16 is arranged on the outside of the protective hose 17. One end of the protective hose 17 is connected to the fixed The fixed ring 15 on the outside of the inlet pipe 5 and the discharge pipe 10 is connected, and the other end of the protective hose 17 is connected to the movable ring 13. The inner diameter of the movable ring 13 and the inner diameter of the end of the protective hose 17 away from the fixed ring 15 are both larger than the inner diameter of the fixed ring 15. A gravity sensor 131 is installed on the side below the movable ring 13, and a protective hose 17 is provided above the gravity sensor 131. There is a distance between the protective hose 17 and the gravity sensor 131. A corresponding manual telescopic rod 16 is provided below the gravity sensor 131, and an alarm 14 is installed at the top of the column 1.

[0023] First, the entire safety loading and unloading device is moved into the working area. After arriving at the working area, the rotation angle of the outer arm 7 is adjusted by cooperating with the spring cylinder 9 and the rotary joint 8 to meet the needs of later use. Then the safety loading and unloading device is pre-cooled. First, a small amount of liquid nitrogen of about 5% flow is introduced into the pipeline to cool the pipeline from room temperature to -196°C to avoid stress cracking of the material caused by sudden temperature change. Then, docking and positioning are performed, and the inlet pipe 5 is connected to the external liquid supply mechanism through the connecting flange 51, and then the discharge pipe 10 is connected to the external tank truck tank port through the connecting flange 51. Then, the flow rate is precisely controlled by the pneumatic regulating valve, and the liquid nitrogen can be loaded, unloaded and transported. The liquid nitrogen flows from the inlet pipe 5 into the inner arm 6, and then into the outer arm 7, and is loaded and unloaded and transported to the storage tank by the discharge pipe 10. Since this part is existing technology, it will not be introduced in detail here.

[0024] At the same time, manually pull the movable ring 13 and the protective hose 17 on the outside of the inlet pipe 5 and the discharge pipe 10 outward, so that the protective hose 17 is stretched. At this time, multiple sets of manual telescopic rods 16 are also stretched to support the outside of the protective hose 17 and the movable ring 13. At this time, the stretched protective hose 17 is sleeved on the outside of the connecting flange 51. During the loading and unloading process, if the sealing structure in the connecting flange 51 on the inlet pipe 5 or the discharge pipe 10 is damaged, the liquid nitrogen in the loading and unloading device leaks out from the connecting flange 51. At this time, the liquid nitrogen flowing out will flow downward into the protective hose 17. Therefore, the flowing liquid nitrogen can be collected and protected by the protective hose 17. When the leaked liquid nitrogen reaches a certain amount, it is collected and protected by the protective hose 17. The gravity of the liquid nitrogen itself will automatically drive the lower surface of the protective hose 17 to move downward, and then the protective hose 17 will contact the gravity sensor 131 below. Then, after the gravity sensor 131 detects a leak, it will transmit this signal to the central processing module. The central processing module controls the alarm 14 to sound an alarm in time to remind the surrounding staff. When the loading and unloading is completed, one end of the control valve 12 is connected to the external dry nitrogen delivery mechanism, and then the control valve 12 is opened. The external dry nitrogen enters the outer arm 7 through the joint purge port 11, purges the pipeline in the safe loading and unloading device, and prevents the residual liquid nitrogen from vaporizing and exploding. Since this part is also a prior art, it will not be introduced below. Example 2: The liquid nitrogen anti-leakage safety loading and unloading device in this embodiment, based on Example 1, can shield the outside of the protective hose 17 to a certain extent to prevent the liquid nitrogen collected in the protective hose 17 from flowing onto the ground. For specific structure, refer to the attached Figures 8-12 As shown, the inner wall of the mobile ring 13 is installed with an inner shielding cloth 18 in a circular shape, and the inner groove of the mobile ring 13 is evenly spaced and grooved with an air storage pipe 19. One end of the air storage pipe 19 is fitted with a piston assembly 191, and the piston assembly 191 is connected to the air storage pipe 19 through a spring, and the other end of the piston assembly 191 is connected to the push-opening plate 20, and the push-opening plate 20 is arranged in an arc shape, and one side of the push-opening plate 20 is bonded to the outer side of the inner shielding cloth 18, and the inner shielding cloth 18 is made of umbrella cloth. The right side of the air storage pipe 19 is connected to the air storage airbag 211 through a connecting pipe 214, and an extrusion plate 21 is fixed to the left side of the air storage airbag 211. The connecting pipe 214 is made of the same material as the protective hose 17. The right end of the connecting pipe 214 passes through the interior of the extrusion plate 21. One side of the extrusion plate 21 is slidably connected to the guide column 213 installed in the movable ring 13, and the other side of the extrusion plate 21 is connected to a connecting rope 212. The right end of the connecting rope 212 passes through the right side of the movable ring 13 and is connected to the fixed ring 15.

[0025] When the mobile ring 13 and the protective hose 17 are pulled outward, the multiple sets of manual telescopic rods 16 are stretched. Among the multiple sets of manual telescopic rods 16, only one set of manual telescopic rods 16 has a locking mechanism (the locking mechanism is the same as the locking mechanism of telescopic umbrella rods on the market, so it will not be described in detail here). At this time, the locking mechanism in one set of manual telescopic rods 16 locks one of the stretched manual telescopic rods 16, so that the position of the mobile ring 13 pulled outward is fixed. In the process of the mobile ring 13 moving outward, since one end of the connecting rope 212 is fixed, the connecting rope 212 will be straightened and will pull the extrusion plate 21, and the extrusion plate 21 will be on the guide column 213. The stable movement of the outside causes the extrusion plate 21 to squeeze the air storage bag 211, and the gas in the air storage bag 211 enters the air storage tube 19 through the connecting tube 214, so that the piston assembly 191 in the air storage tube 19 automatically drives the deployment plate 20 to move inward. At this time, the spring connected to the other end of the air storage tube 19 is stretched and stored, and then the four groups of arc-shaped deployment plates 20 move inward at the same time to deploy the inner shielding cloth 18 inward, and then the internal opening of the movable ring 13 is reduced by the inwardly deployed inner shielding cloth 18, so that the inwardly deployed inner shielding cloth 18 can well shield the left side of the protective hose 17, thereby preventing the liquid nitrogen collected in the protective hose 17 from flowing out, and further protecting the leaked liquid nitrogen.

[0026] After the later use, manually adjust the locking mechanism in a set of manual telescopic rods 16 to release the lock, and then the piston assembly 191 can be automatically driven to move in the opposite direction and reset through the stored force of the spring, and then manually pull the movable ring 13 and the protective hose 17 inward to reset. At this time, the protective hose 17 is in a retracted state, and the connecting flange 51 is exposed to the outside for the next use, thereby completing a series of tasks.

[0027] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A liquid nitrogen leak-proof safety loading and unloading device, comprising a column (1) for stably placing in a working area, wherein the right side of the column (1) is connected to a vertical pipe (3) through a support frame (2), and the lower end of the vertical pipe (3) is connected to an inner arm (6), characterized in that: An inlet pipe (5) is installed below the left end of the inner arm (6), and the right end of the inner arm (6) is connected to the outer arm (7) via a rotary joint (8). A spring cylinder (9) for adjusting the rotation angle of the outer arm (7) is installed on the rear side of the outer arm (7). The right end of the outer arm (7) is connected to a discharge pipe (10), and shielding protection mechanisms are provided on the outsides of the inlet pipe (5) and the discharge pipe (10).

2. The liquid nitrogen leak-proof safety loading and unloading device according to claim 1, characterized in that: The outer ends of the inlet pipe (5) and the discharge pipe (10) are both fixed with connecting flanges (51), the left end of the fixing frame (4) fixed above the inner arm (6) is connected to the vertical pipe (3), the front side of the outer arm (7) is connected to the joint purge port (11), and the left end of the joint purge port (11) is installed with a control valve (12).

3. The liquid nitrogen leak-proof safety loading and unloading device according to claim 1, characterized in that: The shielding protection mechanism comprises a protective hose (17) sleeved on the outside of the inlet pipe (5) and the outlet pipe (10), a fixed ring (15) and a movable ring (13); one side of the fixed ring (15) is connected to the movable ring (13) via a manual telescopic rod (16); the manual telescopic rod (16) is arranged on the outside of the protective hose (17); one end of the protective hose (17) is connected to the fixed ring (15) fixed on the outside of the inlet pipe (5) and the outlet pipe (10); and the other end of the protective hose (17) is connected to the movable ring (13).

4. The liquid nitrogen leak-proof safety loading and unloading device according to claim 3, characterized in that: The inner diameter of the movable ring (13) and the inner diameter of the end of the protective hose (17) away from the fixed ring (15) are both larger than the inner diameter of the fixed ring (15).

5. The liquid nitrogen leak-proof safety loading and unloading device according to claim 3, characterized in that: A gravity sensor (131) is installed on a side surface below the movable ring (13), a protective hose (17) is provided above the gravity sensor (131), a distance exists between the protective hose (17) and the gravity sensor (131), and a corresponding manual telescopic rod (16) is provided below the gravity sensor (131).

6. The liquid nitrogen leak-proof safety loading and unloading device according to claim 1, characterized in that: An alarm (14) is installed on the top of the column (1).

7. The liquid nitrogen leak-proof safety loading and unloading device according to claim 3, characterized in that: An inner shielding cloth (18) in the form of a circular ring is installed on the inner side wall of the movable ring (13).

8. The liquid nitrogen leakage prevention safety loading and unloading device according to claim 7, characterized in that: An air storage pipe (19) is installed in the interior of the movable ring (13) at equal intervals. A piston assembly (191) is fitted inside one end of the air storage pipe (19), and the piston assembly (191) is connected to the air storage pipe (19) via a spring. The other end of the piston assembly (191) is connected to a push-opening plate (20), and the push-opening plate (20) is arranged in an arc shape. One side of the push-opening plate (20) is bonded to the outer side of the inner shielding cloth (18), and the inner shielding cloth (18) is made of umbrella cloth.

9. The liquid nitrogen anti-leakage safety loading and unloading device according to claim 8, characterized in that: The right side of the gas storage pipe (19) is connected to the gas storage bag (211) via a connecting pipe (214), and an extrusion plate (21) is fixed to the left side of the gas storage bag (211). The connecting pipe (214) is made of the same material as the protective hose (17), and the right end of the connecting pipe (214) passes through the interior of the extrusion plate (21).

10. The liquid nitrogen anti-leakage safety loading and unloading device according to claim 9, characterized in that: One side of the extrusion plate (21) is slidably connected to a guide column (213) installed in the movable ring (13), and the other side of the extrusion plate (21) is connected to a connecting rope (212). The right end of the connecting rope (212) passes through the right side of the movable ring (13) and is connected to the fixed ring (15).

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