Accurate and controllable LNG sampling gasification device

Abstract

The invention relates to the technical field of LNG sampling, and discloses a precise controllable LNG sampling gasification device which comprises a sampling pump, a sampling pipe is arranged at one end of the sampling pump, a conveying pipe is arranged at the other end of the sampling pump, a gasifier is arranged at the end, away from the sampling pump, of the conveying pipe, and an exhaust pipe is arranged at the top end of the gasifier. And a heater is arranged in the reservoir at the lower part of the gasifier. A motor drives a driving rod to rotate, a vertical rod is driven to rotate through transmission of a bevel gear, a double-sided gear and a driven wheel, then a top plate and a plurality of spiral stirring rods are driven to rotate around the vertical rod, shifting rods rotate along with the driving rod to indirectly shift bottom plates on the two sides, and then threaded rods and the spiral stirring rods are driven to rotate; the effect of uniformly mixing the liquefied natural gas is achieved, the centrifugal force of traditional stirring is broken through, separation of the natural gas due to centrifugation is avoided, and water bath heating is more uniform.

Description

Technical Field

[0001] The present invention relates to the technical field of LNG sampling, and in particular to a precise and controllable LNG sampling gasification device. Background Art

[0002] The main component of natural gas is methane, which is recognized as the cleanest fossil energy on earth. After a series of ultra-low temperature liquefaction, natural gas is transported by liquefied natural gas ships. The transportation of liquefied natural gas is tested by sampling and then gasifying.

[0003] After searching, the Chinese patent with publication number CN114878258A: A precise and controllable LNG sampling and gasification device, including a sampling inner tube, the inlet end of the sampling inner tube is connected to the LNG sampling main pipe, the sampling inner tube is configured to extract the deep cold LNG sample in the LNG sampling main pipe, the gasification mechanism is connected to the outlet end of the sampling inner tube, the gasification mechanism is configured to gasify the deep cold LNG sample transported by the sampling inner tube, and the flow control mechanism is arranged on the sampling inner tube located upstream of the gasification mechanism. The flow control mechanism is configured to control the flow of the deep cold LNG sample transported by the sampling inner tube and protect the integrity of the gasified natural gas sample, which can not only obtain LNG samples with integrity, but also gasify them into representative gaseous natural gas samples. However, the above technical solution still has the following deficiencies when implemented: (1) Uneven gasification: Liquid natural gas is often gasified by water bath heating. However, the heat transfer efficiency of liquid natural gas is low. The liquid natural gas in the middle of the gasifier relies on the liquid natural gas on the periphery for heat conduction, which easily causes uneven gasification. (2) Low gasification efficiency: The temperature of liquefied natural gas is low. The temperature of liquefied natural gas entering the gasifier is basically kept at a low temperature. The maximum temperature of the water bath heating water is only 100 degrees, and the heating speed is relatively slow, resulting in low gasification efficiency. (3) Inconvenient cleaning: The temperature of liquefied natural gas is relatively low. After the liquefied natural gas is drawn out from the storage tank and enters the process of heat exchange with the air outside the delivery pipe, it is easy to cause ice to form on the outer wall of the delivery pipe. Especially in cold weather, the ice layer will thicken rapidly. Over time, it will not only make it difficult to clean the outer surface of the delivery pipe, but also cause damage to the delivery pipe. Therefore, it is necessary to design a precise and controllable LNG sampling and gasification device to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a precise and controllable LNG sampling and gasification device.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A precise and controllable LNG sampling and gasification device comprises a sampling pump, a sampling tube is arranged at one end of the sampling pump, a delivery pipe is arranged at the other end of the sampling pump, a vaporizer is arranged at one end of the delivery pipe away from the sampling pump, an exhaust pipe is arranged at the top of the vaporizer, and a heater is arranged at a water storage tank below the vaporizer; The gasifier is provided with a mixing component and a preheating component; Wherein, the mixing component is arranged inside the gasifier; Wherein, the preheating assembly is connected to the gasifier and the delivery pipe; The conveying pipe is provided with a transmission component and a protection component; Wherein, the transmission component links the mixing component with the preheating component and the protection component; Wherein, the protection component acts on the outer surface of the conveying pipe.

[0006] As a preferred technical solution of the present invention, the mixing assembly includes a motor, an active rod, a bevel gear, a double-sided gear, a vertical rod, a driven wheel, a bottom plate, a top plate, a spiral stirring rod, a threaded rod, a spring and a lever. The motor is arranged on the outer surface of the gasifier, the active rod is fixedly connected to the driving end of the motor, the bevel gear is fixedly sleeved on the outer surface of the active rod, the double-sided gear is movably arranged inside the gasifier, the vertical rod is rotatably connected to the bottom inner wall of the gasifier, the driven wheel is fixedly sleeved on the outer surface of the vertical rod, the bottom plate is movably sleeved on the outer surface of the vertical rod, the top plate is fixedly connected to the top end of the vertical rod, the spiral stirring rod is rotatably connected to the upper surface of the bottom plate, the threaded rod is fixedly connected to the top end of the spiral stirring rod, the spring is sleeved on the outer surface of the vertical rod, and the lever is fixedly sleeved in the middle of the active rod.

[0007] As a preferred technical solution of the present invention, the transmission assembly includes pulley one, pulley two, a toothed belt and a driven rod, pulley one is fixedly connected to the end of the active rod, the driven rod is movably inserted in the middle of the conveying pipe, pulley two is fixedly connected to the end of the driven rod, and the toothed belt is meshingly sleeved on the outer surfaces of pulley one and pulley two.

[0008] As a preferred technical solution of the present invention, the preheating assembly includes a circulation pump, a hollow tube, a circulation pipe, a center rod, a fan plate, a gear ring, a cylinder, a positioning rod, a rack, a slider and a slide groove. The circulation pump is arranged on the side of the gasifier, the hollow tube is fixedly sleeved on the outer surface of the conveying pipe, the circulation pipe is fixedly connected to the side of the hollow tube, the center rod is rotatably connected to the inner wall of the circulation pipe, the fan plate is distributed in an annular matrix on the outer surface of the center rod, the gear ring is fixedly sleeved on the end of the center rod, the cylinder is movably sleeved on one end of the driven rod extending into the circulation pipe, the positioning rod is fixedly connected to the side of the cylinder, the rack is fixedly connected to the lower part of the positioning rod, the slider is fixedly connected to the end of the driven rod, and the slide groove is opened on the inner wall of the cylinder.

[0009] As a preferred technical solution of the present invention, the protective assembly includes a collar, a frame plate, a half gear, a tooth block, a shovel blade and a friction ring. The collar is movably sleeved on the outer surface of the hollow tube, the frame plate is fixedly connected to the middle part of the outer surface of the collar, the half gear is fixedly sleeved on the outer surface of the driven rod, the tooth block is arranged on the upper and lower sides of the inner wall of the frame plate, the shovel blade is fixedly connected to the side of the collar, and the friction ring is fixedly connected to the inner ring of the collar.

[0010] As a preferred technical solution of the present invention, the bevel gear is meshed with the upper surface of the double-sided gear, the driven wheel is meshed with the inner side of the double-sided gear, and the threaded rod is threadedly inserted and connected in the middle of the top plate.

[0011] As a preferred technical solution of the present invention, the top end of the spring abuts against the lower surface of the bottom plate, the bottom end of the spring abuts against the upper surface of the driven wheel, and the shift block abuts against the bottom plate in an offset manner.

[0012] As a preferred technical solution of the present invention, the water inlet end of the circulation pump is connected to the water reservoir of the gasifier, the water outlet end of the circulation pump is connected to the lower surface of the hollow tube, the end of the circulation tube away from the hollow tube is fixedly connected to the outer surface of the gasifier, and the outer surface of the fan plate is in contact with the inner wall of the circulation tube.

[0013] As a preferred technical solution of the present invention, the rack is meshedly connected with the gear ring, and the slider slides within the slide groove in a limited position.

[0014] As a preferred technical solution of the present invention, the half gear is meshingly connected with the gear block, and the shovel blade and the friction ring are both attached to the outer surface of the hollow tube.

[0015] The present invention has the following beneficial effects: 1. By setting a mixing component inside the gasifier, the active rod is driven to rotate by the motor, and the vertical rod is driven to rotate through the transmission of the bevel gear, double-sided gear and driven wheel, thereby driving the top plate and multiple spiral stirring rods to rotate around the vertical rod. The lever will indirectly move the bottom plates on both sides as the active rod rotates, thereby driving the threaded rod and the spiral stirring rod to rotate, thereby achieving the effect of mixing the liquid natural gas and breaking the centrifugal force of traditional stirring, avoiding the separation of natural gas due to centrifugation, and making the water bath heating more uniform; 2. By setting the preheating component on the outer surface of the delivery pipe, the circulating pump is used to deliver hot water into the hollow pipe. The rotation of the driven rod will drive the cylinder and the rack to reciprocate, and then drive the gear ring to rotate, so that the fan plate and the inner wall of the circulation pipe are switched between fitting and separation, thereby achieving the effect of indirect hot water delivery, increasing the residence time of hot water in the hollow pipe, further improving the preheating effect, and thus improving the gasification efficiency of natural gas; 3. By setting a protective component on the outer surface of the conveying pipe, the driven rod is used to rotate the half gear to drive the rotation, thereby achieving the purpose of reciprocating movement of the ring on the outer surface of the hollow pipe. The shovel can clean the ice on the outer surface of the hollow pipe, and the sliding friction between the friction ring and the outer surface of the hollow pipe can generate heat, further reducing the possibility of ice on the hollow pipe, thereby achieving the purpose of protecting the conveying pipe and increasing the service life of the conveying pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall structure of a precise and controllable LNG sampling and gasification device proposed by the present invention; Figure 2 This is a second perspective structural schematic diagram of a precise and controllable LNG sampling and gasification device proposed by the present invention; Figure 3 This is a schematic diagram of the structure of a mixing component of a precise and controllable LNG sampling and gasification device proposed by the present invention; Figure 4 This is a schematic diagram of the pole connection structure of a precise and controllable LNG sampling and gasification device proposed by the present invention; Figure 5 This is a schematic diagram of the transmission component structure of a precise and controllable LNG sampling and gasification device proposed by the present invention; Figure 6 This is a schematic diagram of the coordination structure of the preheating component and the protection component of a precise and controllable LNG sampling and gasification device proposed by the present invention; Figure 7 This is a schematic diagram of the structure of a preheating component of a precise and controllable LNG sampling and gasification device proposed by the present invention; Figure 8 This is a schematic diagram of the cylindrical structure of a precise and controllable LNG sampling and gasification device proposed by the present invention; Fig. 9 This is a schematic diagram of the collar structure of a precise and controllable LNG sampling and gasification device proposed in the present invention.

[0017] In the figure: 1, sampling pump; 2, sampling tube; 3, delivery tube; 4, gasifier; 401, exhaust pipe; 402, heater; 501, motor; 502, active rod; 503, bevel gear; 504, double-sided gear; 505, vertical rod; 506, driven wheel; 507, bottom plate; 508, top plate; 509, spiral stirring rod; 510, threaded rod; 511, spring; 512, lever; 601, pulley 1; 602 , pulley 2; 603, toothed belt; 604, driven rod; 701, circulating pump; 702, hollow tube; 703, circulating tube; 704, center rod; 705, fan plate; 706, gear ring; 707, cylinder; 708, positioning rod; 709, rack; 710, slider; 711, slide; 801, sleeve ring; 802, frame plate; 803, half gear; 804, tooth block; 805, shovel blade; 806, friction ring. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0019] Reference Figures 1 to 9 A precise and controllable LNG sampling and gasification device includes a sampling pump 1, a sampling tube 2 is provided at one end of the sampling pump 1, a delivery pipe 3 is provided at the other end of the sampling pump 1, a vaporizer 4 is provided at the end of the delivery pipe 3 away from the sampling pump 1, an exhaust pipe 401 is provided at the top of the vaporizer 4, and a heater 402 is provided in the lower water reservoir of the vaporizer 4. The sampling pump 1 takes out liquid natural gas from the pipeline and transports it to the inside of the vaporizer 4 through the delivery pipe 3. The heater 402 heats water and heats the liquid natural gas by water bath heating, so that it is vaporized and discharged and collected from the exhaust pipe 401. The specific structure and operation mode of the sampling pump 1 and the vaporizer 4 are prior arts well known to the staff in this field and will not be elaborated in detail here.

[0020] Reference Figure 2 , Figure 3 and Figure 4, also includes a mixing component, the mixing component is arranged inside the gasifier 4, the mixing component includes a motor 501, an active rod 502, a bevel gear 503, a double-sided gear 504, a vertical rod 505, a driven wheel 506, a bottom plate 507, a top plate 508, a spiral stirring rod 509, a threaded rod 510, a spring 511 and a lever 512, the motor 501 is arranged on the outer surface of the gasifier 4, the active rod 502 is fixedly connected to the driving end of the motor 501, the bevel gear 503 is fixedly sleeved on the outer surface of the active rod 502, the double-sided gear 504 is movably arranged inside the gasifier 4, and the vertical rod 505 is rotatably connected to the gas The bottom inner wall of the condenser 4, the driven wheel 506 is fixedly sleeved on the outer surface of the vertical rod 505, the bottom plate 507 is movably sleeved on the outer surface of the vertical rod 505, the top plate 508 is fixedly connected to the top of the vertical rod 505, the spiral stirring rod 509 is rotatably connected to the upper surface of the bottom plate 507, the threaded rod 510 is fixedly connected to the top of the spiral stirring rod 509, the spring 511 is sleeved on the outer surface of the vertical rod 505, the lever 512 is fixedly sleeved on the middle part of the active rod 502, the bevel gear 503 is meshed with the upper surface of the double-sided gear 504, the driven wheel 506 is meshed with the inner side of the double-sided gear 504, the threaded rod 5 The threaded part 10 is inserted and connected in the middle of the top plate 508, the top end of the spring 511 abuts against the lower surface of the bottom plate 507, the bottom end of the spring 511 abuts against the upper surface of the driven wheel 506, the shift block abuts against the bottom plate 507 in an offset manner, the motor 501 drives the active rod 502 to rotate, thereby driving the bevel gear 503 to rotate, and driving the driven wheels 506 on both sides to rotate under the transmission of the double-sided gear 504, the driven wheel 506 drives the vertical rod 505 to rotate, thereby driving the top plate 508 and the plurality of spiral stirring rods 509 to rotate around the vertical rod 505, stirring the liquid natural gas in the gasifier 4, and the shift rod 512 rotates with the main rod 502. The rotation of the movable rod 502 will indirectly move the bottom plates 507 on both sides, pushing the bottom plates 507 to move along the vertical rods 505, which will then drive the spiral stirring rod 509 to move up and down, and the threaded rod 510 and the top plate 508 will be relatively displaced, which will then drive the threaded rod 510 and the spiral stirring rod 509 to rotate. After the lever 512 is separated from the bottom plate 507, the spring 511 will push the bottom plate 507 to return to its original position, causing the spiral stirring rod 509 to rotate in the opposite direction again, thereby achieving the effect of mixing the liquid natural gas and breaking the centrifugal force of traditional stirring, avoiding the separation of natural gas due to centrifugation, and making the water bath heating more uniform.

[0021] Reference Figure 2 and Figure 5, also includes a transmission component, which is arranged at the end of the mixing component, and the transmission component includes a pulley 1 601, a pulley 2 602, a toothed belt 603 and a driven rod 604. The pulley 1 601 is fixedly connected to the end of the active rod 502, and the driven rod 604 is movably inserted in the middle of the conveying pipe 3. The pulley 2 602 is fixedly connected to the end of the driven rod 604, and the toothed belt 603 is meshingly sleeved on the outer surfaces of the pulley 1 601 and the pulley 2 602. The active rod 502 drives the pulley 1 601 to rotate, and the toothed belt 603 drives the pulley 2 602 to rotate and drives the driven rod 604 to rotate under the meshing transmission.

[0022] Reference Figure 6 , Figure 7 and Figure 8 , and also includes a preheating component, which is arranged on the outer surface of the delivery pipe 3. The preheating component includes a circulation pump 701, a hollow pipe 702, a circulation pipe 703, a center rod 704, a fan plate 705, a gear ring 706, a cylinder 707, a positioning rod 708, a rack 709, a slider 710 and a slide groove 711. The circulation pump 701 is arranged on the side of the gasifier 4, the hollow pipe 702 is fixedly sleeved on the outer surface of the delivery pipe 3, and the circulation pipe 703 is fixedly connected to the side of the hollow pipe 702. The center rod 704 is rotatably connected to the inner wall of the circulation pipe 703, the fan plates 705 are distributed in a ring matrix on the outer surface of the center rod 704, the gear ring 706 is fixedly sleeved on the end of the center rod 704, the cylinder 707 is movably sleeved on the end of the driven rod 604 extending into the circulation pipe 703, the positioning rod 708 is fixedly connected to the side of the cylinder 707, the rack 709 is fixedly connected to the lower part of the positioning rod 708, the slider 710 is fixedly connected to the end of the driven rod 604, and the slide groove 71 1 is opened on the inner wall of the cylinder 707, the water inlet end of the circulation pump 701 is connected to the water reservoir of the gasifier 4, the water outlet end of the circulation pump 701 is connected to the lower surface of the hollow tube 702, the end of the circulation tube 703 away from the hollow tube 702 is fixedly connected to the outer surface of the gasifier 4, the outer surface of the fan plate 705 is in contact with the inner wall of the circulation tube 703, the rack 709 is meshed with the gear ring 706, the slider 710 is limited and slides in the inner limit of the slide groove 711, and the driven rod 604 rotates during the rotation. It will drive the slider 710 to slide in the slide groove 711, and then drive the cylinder 707 to do reciprocating motion. Under the push of the positioning rod 708, the rack 709 also reciprocates, and then drives the gear ring 706 to rotate, so that the fan plate 705 and the inner wall of the circulation pipe 703 switch between fitting and separation, thereby achieving the effect of indirect hot water transportation, increasing the residence time of hot water in the hollow tube 702, further improving the preheating effect, and thus improving the gasification efficiency of natural gas.

[0023] Reference Figure 6 and Fig. 9, also includes a protection component, the protection component is arranged on the outer surface of the conveying pipe 3, the protection component includes a collar 801, a frame plate 802, a half gear 803, a tooth block 804, a shovel blade 805 and a friction ring 806, the collar 801 is movably sleeved on the outer surface of the hollow tube 702, the frame plate 802 is fixedly connected to the middle of the outer surface of the collar 801, the half gear 803 is fixedly sleeved on the outer surface of the driven rod 604, the tooth block 804 is arranged on the upper and lower sides of the inner wall of the frame plate 802, the shovel blade 805 is fixedly connected to the side of the collar 801, the friction ring 806 is fixedly connected to the inner ring of the collar 801, the half gear 803 is meshed with the tooth block 804, the shovel blade 805 and the friction ring The friction rings 806 are all fitted on the outer surface of the hollow tube 702. During the rotation of the driven rod 604, the half gear 803 is also driven to rotate. During the rotation of the half gear 803, it meshes with the tooth block 804 and drives the frame plate 802 to reciprocate. The frame plate 802 further drives the ring 801 to move, thereby achieving the purpose of reciprocating movement of the ring 801 on the outer surface of the hollow tube 702. The shovel can clean the ice on the outer surface of the hollow tube 702, and the sliding friction between the friction ring 806 and the outer surface of the hollow tube 702 can generate heat, further reducing the possibility of ice on the hollow tube 702, thereby achieving the purpose of protecting the conveying pipe 3 and increasing the service life of the conveying pipe 3.

[0024] The specific working principle of the present invention is as follows: The present invention proposes a precise and controllable LNG sampling and gasification device, which consists of a sampling pump 1, a gasifier 4 and some pipelines. The sampling pump 1 takes the liquefied natural gas out of the pipeline and transports it to the inside of the gasifier 4 through the delivery pipe 3. The heater 402 heats the water. The liquefied natural gas is heated by water bath heating, so that it is gasified and discharged and collected from the exhaust pipe 401. In this process, the liquefied natural gas is stirred by the mixing component to make the heating more uniform. The preheating component can be driven to operate and preheat the liquefied natural gas in the delivery pipe 3 under the linkage of the transmission component, so as to further improve the efficiency of gasification. The delivery pipe 3 is protected by the protection component, and the ice on the outer surface is removed to protect the delivery pipe 3. Specifically, the motor 501 drives the active rod 502 to rotate, thereby driving the bevel gear 503 to rotate, and the double-sided gear 504 drives the active rod 502 to rotate. The driven wheels 506 on both sides of the driving rod 502 rotate, and the driven wheels 506 drive the vertical rod 505 to rotate, thereby driving the top plate 508 and the plurality of spiral stirring rods 509 to rotate around the vertical rod 505, so as to stir the liquid natural gas in the gasifier 4. In addition, the lever 512 will indirectly shift the bottom plates 507 on both sides as the active rod 502 rotates, and push the bottom plates 507 to move along the vertical rod 505, thereby driving the spiral stirring rods 509 to move up and down. The threaded rod 510 and the top plate 508 are relatively displaced, thereby driving the threaded rod 510 and the spiral stirring rod 509 to rotate. After the lever 512 is separated from the bottom plate 507, the spring 511 will push the bottom plate 507 to reset, so that the spiral stirring rod 509 rotates in the opposite direction again, thereby achieving the effect of mixing the liquid natural gas and breaking the centrifugal force of traditional stirring, thereby avoiding the separation of natural gas due to centrifugation, and making the water bath heating more uniform. The circulation pump 701 transports the water in the bottom of the vaporizer 4 and transports the hot water to the inside of the hollow tube 702, so that the hollow tube 702 is heated and the delivery pipe 3 is preheated. At the same time, the active rod 502 drives the pulley 1 601 to rotate, and drives the pulley 2 602 to rotate and drive the driven rod 604 to rotate under the meshing transmission of the toothed belt 603. During the rotation of the driven rod 604, the slider 710 is driven to slide in the slide groove 711, and then the cylinder 707 is driven to reciprocate. Under the push of the positioning rod 708, the rack 709 also reciprocates, and then the gear ring 706 is driven to rotate, so that the fan plate 705 and the inner wall of the circulation pipe 703 are switched between fitting and separation, so as to achieve the effect of indirect hot water transportation, thereby improving The residence time of hot water in the hollow tube 702 is increased, and the preheating effect is further improved, thereby improving the gasification efficiency of natural gas. During the rotation of the driven rod 604, the half gear 803 is also driven to rotate. During the rotation of the half gear 803, it meshes with the tooth block 804 and drives the frame plate 802 to reciprocate. The frame plate 802 further drives the ring 801 to move, thereby achieving the purpose of reciprocating movement of the ring 801 on the outer surface of the hollow tube 702. The shovel can clean the ice on the outer surface of the hollow tube 702, and the sliding friction between the friction ring 806 and the outer surface of the hollow tube 702 can generate heat, further reducing the possibility of ice on the hollow tube 702, thereby achieving the purpose of protecting the delivery pipe 3 and improving the service life of the delivery pipe 3.

[0025] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A precise and controllable LNG sampling and gasification device, characterized in that: It comprises a sampling pump (1), a sampling tube (2) being arranged at one end of the sampling pump (1), a delivery tube (3) being arranged at the other end of the sampling pump (1), a vaporizer (4) being arranged at one end of the delivery tube (3) away from the sampling pump (1), an exhaust pipe (401) being arranged at the top end of the vaporizer (4), and a heater (402) being arranged at a water storage tank at the bottom of the vaporizer (4); The gasifier (4) is provided with a mixing component and a preheating component; Wherein, the mixing component is arranged inside the gasifier (4); Wherein, the preheating component is connected to the gasifier (4) and the delivery pipe (3); The delivery pipe (3) is provided with a transmission component and a protection component; Wherein, the transmission component links the mixing component with the preheating component and the protection component; Wherein, the protective component acts on the outer surface of the conveying pipe (3).

2. A precise and controllable LNG sampling and gasification device according to claim 1, characterized in that: The mixing assembly comprises a motor (501), an active rod (502), a bevel gear (503), a double-sided gear (504), a vertical rod (505), a driven wheel (506), a bottom plate (507), a top plate (508), a spiral stirring rod (509), a threaded rod (510), a spring (511) and a lever (512); the motor (501) is arranged on the outer surface of the gasifier (4); the active rod (502) is fixedly connected to the driving end of the motor (501); the bevel gear (503) is fixedly sleeved on the outer surface of the active rod (502); and the double-sided gear (504) is movably arranged on the outer surface of the gasifier (4). Inside, the vertical rod (505) is rotatably connected to the bottom inner wall of the gasifier (4), the driven wheel (506) is fixedly sleeved on the outer surface of the vertical rod (505), the bottom plate (507) is movably sleeved on the outer surface of the vertical rod (505), the top plate (508) is fixedly connected to the top of the vertical rod (505), the spiral stirring rod (509) is rotatably connected to the upper surface of the bottom plate (507), the threaded rod (510) is fixedly connected to the top of the spiral stirring rod (509), the spring (511) is sleeved on the outer surface of the vertical rod (505), and the shifting rod (512) is fixedly sleeved on the middle part of the active rod (502).

3. The precise and controllable LNG sampling and gasification device according to claim 1 is characterized in that: The transmission assembly comprises a pulley 1 (601), a pulley 2 (602), a toothed belt (603) and a driven rod (604), wherein the pulley 1 (601) is fixedly connected to the end of the active rod (502), the driven rod (604) is movably inserted into the middle of the conveying pipe (3), the pulley 2 (602) is fixedly connected to the end of the driven rod (604), and the toothed belt (603) is meshingly sleeved on the outer surfaces of the pulley 1 (601) and the pulley 2 (602).

4. The precise and controllable LNG sampling and gasification device according to claim 3 is characterized in that: The preheating assembly comprises a circulation pump (701), a hollow tube (702), a circulation pipe (703), a center rod (704), a fan plate (705), a gear ring (706), a cylinder (707), a positioning rod (708), a rack (709), a slider (710) and a slide groove (711), wherein the circulation pump (701) is arranged on the side of the gasifier (4), the hollow tube (702) is fixedly sleeved on the outer surface of the delivery pipe (3), the circulation pipe (703) is fixedly connected to the side of the hollow tube (702), and the center rod (704) is rotatably connected to the circulation pipe (70 3), the fan plates (705) are distributed in an annular matrix on the outer surface of the center rod (704), the gear ring (706) is fixedly sleeved on the end of the center rod (704), the cylinder (707) is movably sleeved on one end of the driven rod (604) extending into the circulation pipe (703), the positioning rod (708) is fixedly connected to the side of the cylinder (707), the rack (709) is fixedly connected to the lower part of the positioning rod (708), the slider (710) is fixedly connected to the end of the driven rod (604), and the slide groove (711) is opened on the inner wall of the cylinder (707).

5. The precise and controllable LNG sampling and gasification device according to claim 4, characterized in that: The protection component comprises a collar (801), a frame plate (802), a half gear (803), a tooth block (804), a shovel blade (805) and a friction ring (806); the collar (801) is movably sleeved on the outer surface of the hollow tube (702); the frame plate (802) is fixedly connected to the middle of the outer surface of the collar (801); the half gear (803) is fixedly sleeved on the outer surface of the driven rod (604); the tooth block (804) is arranged on the upper and lower sides of the inner wall of the frame plate (802); the shovel blade (805) is fixedly connected to the side of the collar (801); and the friction ring (806) is fixedly connected to the inner ring of the collar (801).

6. The precise and controllable LNG sampling and gasification device according to claim 2, characterized in that: The bevel gear (503) is meshedly connected with the upper surface of the double-sided gear (504), the driven wheel (506) is meshedly connected with the inner side of the double-sided gear (504), and the threaded rod (510) is threadedly inserted and connected to the middle part of the top plate (508).

7. The precise and controllable LNG sampling and gasification device according to claim 6, characterized in that: The top end of the spring (511) abuts against the lower surface of the bottom plate (507), the bottom end of the spring (511) abuts against the upper surface of the driven wheel (506), and the shift block abuts against the bottom plate (507) in an offset manner.

8. The precise and controllable LNG sampling and gasification device according to claim 4, characterized in that: The water inlet end of the circulation pump (701) is connected to the water reservoir of the gasifier (4), the water outlet end of the circulation pump (701) is connected to the lower surface of the hollow tube (702), one end of the circulation tube (703) away from the hollow tube (702) is fixedly connected to the outer surface of the gasifier (4), and the outer surface of the fan plate (705) is in contact with the inner wall of the circulation tube (703).

9. The precise and controllable LNG sampling and gasification device according to claim 8, characterized in that: The rack (709) is meshingly connected with the gear ring (706), and the sliding block (710) slides within the sliding groove (711) in a limited position.

10. The precise and controllable LNG sampling and gasification device according to claim 5, characterized in that: The half gear (803) is meshingly connected with the gear block (804), and the shovel blade (805) and the friction ring (806) are both attached to the outer surface of the hollow tube (702).

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