Liquefied natural gas (LNG) tank hoisting device

Abstract

The utility model discloses an LNG (Liquefied Natural Gas) tank hoisting device, and particularly relates to the technical field of LNG tank hoisting, the LNG tank hoisting device comprises a hoisting assembly, the hoisting assembly comprises a top plate, sliding chutes are formed in two sides of the bottom of the top plate, fixing assemblies are arranged in the two sliding chutes, each fixing assembly comprises a two-way lead screw, and the two two-way lead screws are rotationally arranged in the two sliding chutes respectively. According to the utility model, the servo motor drives the two bidirectional lead screws connected by the two chain wheels and the chain to rotate at the same time, so that the two nut blocks on the two bidirectional lead screws are close to each other, and then the two clamping plates are driven to be close to each other and attached to the outer wall of the LNG tank, so that the LNG tank is firmly fixed, the hoisting stability of the LNG tank is improved, and the hoisting efficiency of the LNG tank is improved. And then a plurality of second hydraulic cylinders are used for driving a top plate to lift the LNG tank, so that each universal wheel is in contact with the ground to support a clamping plate, and then the stability of the whole device during transportation of the LNG tank can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of LNG tank lifting, and more specifically to a LNG tank lifting device. Background Art

[0002] Liquefied natural gas (LNG) is a clean energy with methane as the main component, which is obtained by cooling conventional natural gas to below -160°C under normal pressure through a low-temperature liquefaction process and separating a large amount of polluting elements such as sulfur and phosphorus. LNG tanks are core storage facilities in the LNG industry chain, with large investments, intensive technology, and high safety requirements. At present, the main structure of a conventional LNG full-capacity storage tank consists of structural parts such as the foundation, pedestal, dome, outer tank and inner tank. When constructing an LNG tank, it is necessary to use a lifting device to lift the LNG tank into the installation building.

[0003] At present, in order to improve the applicability of existing lifting devices to LNG tanks, a Chinese patent with prior art publication number CN213265488U discloses a lifting device. The utility model can realize safe and rapid movement of pipe fittings, convenient and reliable clamping, prevent the pipe fittings from slipping during transportation, and the lifting operation is simple, safe and efficient.

[0004] However, the above-mentioned prior art still has the following problems when in use: when the above-mentioned structure is used to lift the LNG tank, due to the high weight of the LNG tank, when the steel wire rope is used to lift the LNG tank, the steel wire rope will shake, which will cause the LNG tank to shake, affecting the safety of the LNG tank when lifting. Utility Model Content

[0005] In order to overcome the above-mentioned defects of the prior art, the utility model provides an LNG tank lifting device, which drives two bidirectional screws connected by two sprockets and a chain to rotate simultaneously through a servo motor, so that the two nut blocks on the two bidirectional screws approach each other, and then drive the two clamps to approach each other and fit on the outer wall of the LNG tank, so as to firmly fix the LNG tank and improve the stability of the LNG tank during lifting, and then use multiple second hydraulic cylinders to drive the top plate to lift the LNG tank first, so that each universal wheel contacts the ground to support the clamp, thereby improving the stability of the entire device when transporting the LNG tank, so as to solve the problems arising from the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a LNG tank lifting device, including a lifting assembly, the lifting assembly including a top plate, slide grooves are provided on both sides of the bottom of the top plate, and fixing assemblies are provided in the two slide grooves, each fixing assembly includes a bidirectional screw, and the two bidirectional screws are respectively rotatably arranged in the two slide grooves, and the two bidirectional screws are threadedly connected to two nut blocks symmetrically distributed front and back, and a first hydraulic cylinder is fixedly provided at the bottom of each nut block, and a connecting block is fixedly provided at the bottom of the first hydraulic cylinder, and a clamping plate is connected to the bottom of the connecting block for fixing the LNG tank, and the two bidirectional screws are connected by a connecting assembly for driving the two bidirectional screws to rotate simultaneously, and two front-to-back distributed embedding grooves are provided at the bottom of each clamping plate, and a universal wheel is fixed in each embedding groove for supporting the clamping plate.

[0007] In a preferred embodiment, a servo motor is fixedly embedded on one side of the rear end of the top plate, and one end of the servo motor output shaft passes through the top plate and is fixed to the rear end of the bidirectional screw close to one side of the top plate, so as to drive the bidirectional screw to rotate.

[0008] In a preferred embodiment, the connecting assembly includes two sprockets, which are fixedly mounted on the outer walls of the two bidirectional screws respectively. The sprocket on one bidirectional screw is arranged between two nut blocks on the bidirectional screw, and the two sprockets are connected by a chain.

[0009] In a preferred embodiment, a receiving groove is provided at the bottom of the top plate, and both sides of the receiving groove are connected to two slide grooves, and the chain and the two sprockets are arranged in the receiving groove and the two slide grooves.

[0010] In a preferred embodiment, electric flatbed trolleys are provided on both the front and rear sides of the bottom of the top plate, and the two electric flatbed trolleys are arranged on the outside of the clamping plate. Two second hydraulic cylinders are fixedly provided between the top of the two electric flatbed trolleys and the bottom of the top plate to facilitate adjusting the height of the top plate. The servo motor is arranged between the two second hydraulic cylinders located at the rear end of the top plate.

[0011] In a preferred embodiment, a slot is provided at the bottom of each connecting block, a plug-in block is inserted into the slot, the bottom of the plug-in block is fixed to the top of the clamping plate, and the plug-in block and the connecting block are fixed by two bolts, so as to facilitate the separation of the plug-in block and the connecting block.

[0012] In a preferred embodiment, a control switch is fixedly provided on the electric flatbed vehicle located in front of the top plate, and the control switch is provided between two second hydraulic cylinders on the electric flatbed vehicle, and the control switch is connected in series with the servo motor, the second hydraulic cylinder and the first hydraulic cylinder.

[0013] Technical effects and advantages of the utility model:

[0014] The utility model drives two bidirectional lead screws connected by two sprockets and a chain to rotate simultaneously through a servo motor, so that the two nut blocks on the two bidirectional lead screws approach each other, thereby driving the two clamping plates to approach each other and fit on the outer wall of the LNG tank, thereby firmly fixing the LNG tank and improving the stability of the LNG tank during lifting. Then, multiple second hydraulic cylinders are used to drive the top plate to first lift the LNG tank, so that each universal wheel contacts the ground to support the clamping plate, thereby improving the stability of the entire device when transporting the LNG tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 It is a side view of the overall structure of the utility model;

[0017] Figure 3 This is a bottom view of the top plate of the utility model;

[0018] Figure 4 This is a structural diagram of the connecting block and the clamping plate of the utility model;

[0019] Figure 5 It is a top view of the overall structure of the utility model.

[0020] The reference numerals are: 1, lifting assembly; 2, top plate; 3, slide; 4, fixing assembly; 5, connecting assembly; 6, embedding groove; 7, universal wheel; 8, servo motor; 9, storage groove; 10, electric flatbed truck; 11, second hydraulic cylinder; 12, slot; 13, plug block; 14, bolt; 15, control switch;

[0021] 401, bidirectional lead screw; 402, nut block; 403, first hydraulic cylinder; 404, connecting block; 405, clamping plate;

[0022] 501. Sprocket; 502. Chain. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] Refer to the instruction manual Figure 1-5The utility model provides an LNG tank lifting device, including a lifting assembly 1, the lifting assembly 1 includes a top plate 2, electric flatbed trucks 10 are provided on both the front and rear sides of the bottom of the top plate 2, two second hydraulic cylinders 11 are fixedly provided between the tops of the two electric flatbed trucks 10 and the bottom of the top plate 2, and the two electric flatbed trucks 10 are provided on the outside of the clamping plate 405, so as to facilitate the adjustment of the height of the top plate 2;

[0025] Next, slide grooves 3 are provided on both sides of the bottom of the top plate 2, and fixing components 4 are provided in the two slide grooves 3. Each fixing component 4 includes a bidirectional screw 401. The two bidirectional screws 401 are respectively rotatably arranged in the two slide grooves 3. Two nut blocks 402 symmetrically distributed front and back are threadedly connected to the two bidirectional screws 401. A first hydraulic cylinder 403 is fixedly provided at the bottom of each nut block 402. A connecting block 404 is fixedly provided at the bottom of the first hydraulic cylinder 403. A clamping plate 405 is connected to the bottom of the connecting block 404 for fixing the LNG tank.

[0026] In addition, a servo motor 8 is fixedly embedded on one side of the rear end of the top plate 2, and the servo motor 8 is arranged between the two second hydraulic cylinders 11 located at the rear end of the top plate 2. One end of the output shaft of the servo motor 8 passes through the top plate 2 and is fixed to the rear end of the bidirectional lead screw 401 close to the side of the top plate 2, so as to drive the bidirectional lead screw 401 to rotate. In addition, the two bidirectional lead screws 401 are connected by a connecting component 5. Specifically, the connecting component 5 includes two sprocket wheels 501, which are fixedly sleeved on the outer walls of the two bidirectional lead screws 401 respectively. The sprocket wheel 501 on one bidirectional lead screw 401 is arranged between the two nut blocks 402 on the bidirectional lead screw 401. The two sprocket wheels 501 are connected by a chain 502, so as to drive the two bidirectional lead screws 401 to rotate simultaneously.

[0027] Furthermore, two embedded grooves 6 are provided at the bottom of each clamping plate 405 and are distributed front and back. A universal wheel 7 is fixed in each embedded groove 6 to support the clamping plate 405.

[0028] In order to facilitate the staff to operate the device, a control switch 15 is fixedly provided on the electric flatbed vehicle 10 located in front of the top plate 2, and the control switch 15 is arranged between the two second hydraulic cylinders 11 on the electric flatbed vehicle 10. The control switch 15 is connected in series with the servo motor 8, the second hydraulic cylinder 11 and the first hydraulic cylinder 403. The start and stop of the servo motor 8, the second hydraulic cylinder 11 and the first hydraulic cylinder 403 are controlled by the control switch 15, so as to facilitate the staff to operate the device.

[0029] When in use, the staff first controls the lifting assembly 1 to move above the LNG tank, and then uses the servo motor 8 to drive the bidirectional screw 401 to rotate. The two bidirectional screws 401 rotate simultaneously under the connection of the sprocket 501 and the chain 502, so that the two nut blocks 402 on each bidirectional screw 401 are close to each other, and then drive the two clamps 405 to approach each other and fit on the outer wall of the LNG tank, so as to firmly fix the LNG tank and improve the stability of the LNG tank during lifting. Then, use multiple second hydraulic cylinders 11 to drive the top plate 2 to lift the LNG tank, and adjust the height of the top plate 2 so that the universal wheel 7 at the bottom of each clamp 405 is in contact with the ground, so as to support the clamp 405 and improve the stability of the entire device when transporting the LNG tank.

[0030] Refer to the instruction manual Figure 2 and 4 A slot 12 is provided at the bottom of each connecting block 404, and an insert block 13 is inserted into the slot 12. The bottom of the insert block 13 is fixed to the top of the clamping plate 405, and the insert block 13 and the connecting block 404 are fixed by two bolts 14, which facilitates the separation of the insert block 13 and the connecting block 404.

[0031] In addition, a storage groove 9 is opened at the bottom of the top plate 2, and both sides of the storage groove 9 are connected to the two slide grooves 3. The chain 502 and the two sprockets 501 are arranged in the storage groove 9 and the two slide grooves 3 to avoid the sprockets 501 and the chain 502 being exposed and affecting the appearance.

[0032] Finally: The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present utility model should be included in the protection scope of the present utility model.

Claims

1. An LNG tank lifting device, comprising a lifting assembly (1), characterized in that: The lifting assembly (1) comprises a top plate (2), and slide grooves (3) are provided on both sides of the bottom of the top plate (2), and fixed assemblies (4) are provided in the two slide grooves (3), and each fixed assembly (4) comprises a bidirectional lead screw (401), and the two bidirectional lead screws (401) are rotatably arranged in the two slide grooves (3) respectively; Two bidirectional lead screws (401) are both threadedly connected with two nut blocks (402) symmetrically distributed front and back, a first hydraulic cylinder (403) is fixedly provided at the bottom of each nut block (402), a connecting block (404) is fixedly provided at the bottom of the first hydraulic cylinder (403), and a clamping plate (405) is connected at the bottom of the connecting block (404) for fixing the LNG tank; The two bidirectional lead screws (401) are connected via a connecting assembly (5) for driving the two bidirectional lead screws (401) to rotate simultaneously. The bottom of each clamping plate (405) is provided with two front-to-back embedded grooves (6), and a universal wheel (7) is fixedly arranged in each embedded groove (6) for supporting the clamping plate (405).

2. The LNG tank lifting device according to claim 1, characterized in that: A servo motor (8) is fixedly embedded on one side of the rear end of the top plate (2); one end of the output shaft of the servo motor (8) passes through the top plate (2) and is fixed to the rear end of a bidirectional lead screw (401) close to one side of the top plate (2), so as to drive the bidirectional lead screw (401) to rotate.

3. The LNG tank lifting device according to claim 1, characterized in that: The connecting assembly (5) comprises two sprockets (501), the two sprockets (501) are respectively fixedly sleeved on the outer walls of the two bidirectional lead screws (401), the sprocket (501) on one bidirectional lead screw (401) is arranged between two nut blocks (402) on the bidirectional lead screw (401), and the two sprockets (501) are connected by a chain (502).

4. The LNG tank lifting device according to claim 3 is characterized in that: The bottom of the top plate (2) is provided with a receiving groove (9), and both sides of the receiving groove (9) are connected to the two slide grooves (3), and the chain (502) and the two sprocket wheels (501) are arranged in the receiving groove (9) and the two slide grooves (3).

5. The LNG tank lifting device according to claim 2, characterized in that: Electric flatbed trolleys (10) are provided on both the front and rear sides of the bottom of the top plate (2), and the two electric flatbed trolleys (10) are arranged on the outside of the clamping plate (405). Two second hydraulic cylinders (11) are fixedly provided between the top of the two electric flatbed trolleys (10) and the bottom of the top plate (2) to facilitate the adjustment of the height of the top plate (2). The servo motor (8) is arranged between the two second hydraulic cylinders (11) located at the rear end of the top plate (2).

6. The LNG tank lifting device according to claim 1, characterized in that: A slot (12) is provided at the bottom of each connecting block (404), an insert block (13) is inserted into the slot (12), the bottom of the insert block (13) is fixed to the top of the clamping plate (405), and the insert block (13) and the connecting block (404) are fixed by two bolts (14), so that the insert block (13) and the connecting block (404) can be easily disassembled.

7. The LNG tank lifting device according to claim 5, characterized in that: A control switch (15) is fixedly provided on the electric flatbed vehicle (10) located in front of the top plate (2), and the control switch (15) is arranged between two second hydraulic cylinders (11) on the electric flatbed vehicle (10), and the control switch (15) is connected in series with the servo motor (8), the second hydraulic cylinder (11) and the first hydraulic cylinder (403).

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