Box-type LNG skid-mounted equipment

Abstract

The invention relates to the technical field of LNG skid-mounted equipment, in particular to box-type LNG skid-mounted equipment which comprises a first equipment frame, a second equipment frame and metal cofferdams, the second equipment frame is fixedly connected with the right end of the first equipment frame, the metal cofferdams are fixedly connected to the side faces of the first equipment frame and the second equipment frame, a liquid storage tank is installed on the inner side of the first equipment frame, and the liquid storage tank is installed on the inner side of the second equipment frame. A high-fall pump pool is installed on the inner side of the second equipment frame, an immersed pump is installed in the high-fall pump pool, access doors are installed at the right end of the second equipment frame and the left end of the first equipment frame correspondingly, and a hoisting assembly is installed at the top of the second equipment frame and comprises a supporting beam, a linear guide rail, a guide frame, a hoisting arm and a cable. The hoisting assembly is installed in the second equipment frame, the immersed pump is moved to the outer side of the box body through the access door to be overhauled after being hoisted, the operation overhaul space and convenience are improved, the height and the left-right length of the box body are effectively controlled, excessive windowing is avoided, and the transportation convenience and the internal sealing performance are improved.

Description

Technical Field

[0001] This invention relates to the field of LNG skid-mounted equipment technology, and more specifically to a box-type LNG skid-mounted equipment. Background Technology

[0002] LNG skid-mounted refueling units are currently the most technologically mature and mainstream liquefied natural gas refueling equipment. There are two main types of submersible pump locations: one is located inside the stainless steel storage tank, which offers many advantages such as convenient transportation; the other is located outside the stainless steel storage tank, but the integrated design results in insufficient height difference between the pump pool and the bottom of the storage tank, making the submersible pump prone to cavitation at low liquid levels. In addition, the high degree of integration and small internal space make maintenance inconvenient.

[0003] Among them, authorization announcement number CN222559797U discloses a box-type LNG skid-mounted equipment. By designing the pump pool assembly as an independent submerged module, the height difference between the bottom of the storage tank and the top of the submersible pump pool is increased by lowering the position of the pump pool, thereby increasing the liquid static pressure head at the inlet of the submersible pump. This design solves the problem of insufficient height difference between the storage tank and the pump pool in traditional equipment, which leads to poor pump operation and low liquid utilization.

[0004] Application publication number CN120157009A discloses a skid-mounted LNG container refueling device skid body for submersible pump maintenance. The skid body facilitates the maintenance of the submersible pump through the top pump hoisting fixture and multi-directional window structure. However, in actual use, the multi-directional window structure significantly reduces the sealing performance of the container, affecting the internal insulation and protection effect. In addition, the U-shaped frame and guide rail located on the outside increase the height of the equipment, and the maintenance platform on the inside increases the size of the equipment, making it inconvenient to move the equipment.

[0005] In summary, existing technologies, while lowering the pump pool position and increasing the height difference between the bottom of the storage tank and the top of the submersible pump pool, employ pump hoisting fixtures and multi-directional window structures for maintenance. The external U-shaped frame and guide rails significantly increase the equipment height, and the internal maintenance platform increases the equipment's lateral length, making it inconvenient to move the equipment. This makes it impossible to improve the smoothness of pump operation and liquid utilization while maintaining ease of transportation and maintenance. Furthermore, existing equipment largely relies on passive insulation, resulting in a high evaporation rate of low-temperature liquids, especially when there are large environmental temperature differences, leading to significant pressure fluctuations in the storage tank.

[0006] Therefore, it is necessary to invent a box-type LNG skid-mounted equipment to solve the above problems. Summary of the Invention

[0007] The purpose of this invention is to provide a box-type LNG skid-mounted equipment to solve the problems of the inability to improve the smoothness of pump operation and liquid utilization while maintaining the convenience of transportation and maintenance, as well as the fact that existing equipment mostly relies on passive insulation, resulting in a high evaporation rate of low-temperature liquids, especially when there are large temperature differences in the environment, and significant pressure fluctuations in the storage tank.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a box-type LNG skid-mounted equipment, comprising a first equipment frame, a second equipment frame, and a metal cofferdam. The second equipment frame is fixedly connected to the right end of the first equipment frame. Metal cofferdams are fixedly connected to the sides of both the first and second equipment frames. A liquid storage tank is installed inside the first equipment frame. A high-drop pump pool is installed inside the second equipment frame. A submersible pump is installed inside the high-drop pump pool. Inspection doors are installed at the right end of the second equipment frame and the left end of the first equipment frame. A hoisting assembly is installed on the top of the second equipment frame. The hoisting assembly includes a support beam, a linear guide rail, a guide frame, a lifting arm, and cables.

[0009] By adopting the above technical solution, the storage tank is used to store LNG, the high-drop pump pool and the submersible pump are used to pump LNG. At the same time, by installing the hoisting assembly inside the second equipment frame and installing the maintenance door at the right end of the second equipment frame, and with the help of the left and right sliding guide frame, lifting arm and cable, the submersible pump can be lifted and moved to the outside of the container for maintenance through the maintenance door. This effectively improves the working and maintenance space, improves the convenience of maintenance, and effectively controls the height and left and right length of the container, improving the convenience of container transportation.

[0010] Optionally, the lower end of the second equipment rack is lower than the lower end of the first equipment rack, the lower end of the first equipment rack is fixedly connected to multiple sets of support legs, the inner side of the first equipment rack is fixedly connected to multiple sets of mounting brackets, and the front and rear sides of the mounting brackets are fixedly connected to first mounting plates.

[0011] By adopting the above technical solution, the lower end of the second equipment rack is lower than the lower end of the first equipment rack, thereby creating a certain height difference between the high-drop pump pool and the storage tank, which facilitates the pumping of low-level LNG, improves utilization efficiency, and extends the service life of the equipment.

[0012] Optionally, the storage tank includes a tank body, a second mounting plate, and a paraffin-based phase change material insulation plate. The tank body is fixedly mounted on the upper end of the mounting frame. The second mounting plate is fixedly connected to the middle position of the upper surface of the tank body. The surface of the tank body is covered with multiple sets of paraffin-based phase change material insulation plates. The two ends of the upper two sets of paraffin-based phase change material insulation plates are fixedly connected to the first mounting plate and the second mounting plate, respectively. The two ends of the lower paraffin-based phase change material insulation plate are fixedly connected to the first mounting plates on both sides, respectively.

[0013] By adopting the above technical solution, the surface of the tank is covered with a paraffin-based phase change material insulation board. The paraffin-based composite material absorbs / releases latent heat, stabilizing the temperature fluctuation of the storage tank. Furthermore, the use of multiple modular structures facilitates replacement and maintenance.

[0014] Optionally, multiple sets of temperature monitoring sensors and semiconductor cooling chips are installed on the inner surface of the metal cofferdam.

[0015] By adopting the above technical solution, the temperature monitoring sensor detects the inside of the chamber. When the temperature is too high, the semiconductor cooling chip is activated to cool the inside of the chamber, reducing the evaporation rate. Combined with the paraffin-based phase change material insulation board, the safety of use is improved.

[0016] Optionally, the upper end of the second equipment frame is fixedly connected to two sets of transverse support beams, and the lower surface of each set of support beams is fixedly connected to a linear guide rail. The front and rear sides of the linear guide rail are provided with two sets of upper and lower guide grooves, and the front and rear sides of the guide frame are fixedly connected to two sets of left and right guide wheels, and the guide wheels are slidably connected to the guide grooves.

[0017] By adopting the above technical solution, the guide wheel assembly cooperates with the guide groove, allowing the guide frame to slide left and right on the lower side of the linear guide rail.

[0018] Optionally, the lifting boom is fixedly connected to the right end of the guide frame, a winch is rotatably connected to the inner side of the lifting boom near the left end, a guide shaft is rotatably connected to the inner side of the lifting boom near the right end, the left end of the cable is wound around the surface of the winch, and the right end of the cable passes through the guide shaft and is fixedly connected to a hook.

[0019] By adopting the above technical solution, the guide frame drives the lifting arm to slide left and right during the sliding process. At the same time, the cable and hook work together to lift the submersible pump. Then, the guide frame slides to the right to move the submersible pump to the outside of the tank, which facilitates the inspection and maintenance of the submersible pump.

[0020] Optionally, a second mounting base is fixedly connected to the right side of the guide frame, and a second motor is fixedly mounted on the side of the second mounting base. The output end of the second motor is fixedly connected to the front end of the winch rotating shaft through a coupling.

[0021] By adopting the above technical solution, the second motor is used to drive the winch to rotate, thereby winding and unwinding the cable.

[0022] Optionally, a transverse guide seat is fixedly connected between the two sets of support beams. The lower wall of the guide seat is provided with a transverse positioning groove, and a guide screw is rotatably connected between the inner walls of the left and right sides of the guide seat.

[0023] By adopting the above technical solution, the guide screw rotates inside the guide seat.

[0024] Optionally, a transmission block is fixedly connected to the middle position of the upper surface of the guide frame, and the upper end of the transmission block is threadedly connected to the guide screw through the positioning groove.

[0025] By adopting the above technical solution, during the rotation of the guide screw, the guide frame slides left and right through the transmission block.

[0026] Optionally, a first mounting base is fixedly connected between the two sets of support beams at the left end of the guide seat and the linear guide rail. A first motor is mounted on the surface of the first mounting base, and the output end of the first motor is fixedly connected to the left end of the guide screw through a coupling.

[0027] By adopting the above technical solution, the output end of the first motor drives the guide screw to rotate through the coupling.

[0028] The technical effects and advantages provided by the present invention in the above technical solution are as follows: 1. This invention installs the hoisting assembly inside the second equipment rack and installs an inspection door at the right end of the second equipment rack. With the help of a guide frame that can slide left and right, a lifting arm and cables, the submersible pump is hoisted and then moved to the outside of the container for inspection through the inspection door. This effectively increases the working and maintenance space, improves the convenience of maintenance, effectively controls the height and left and right length of the container, avoids too many windows, improves the convenience of container transportation, and ensures the sealing of the container's interior. 2. This invention uses a paraffin-based phase change material insulation board to cover the surface of the tank, which absorbs and releases latent heat by utilizing the properties of the paraffin-based phase change material, thereby stabilizing the temperature fluctuation inside the tank. At the same time, it is combined with a semiconductor cooling chip to cool the inside of the tank, thereby reducing the evaporation rate, reducing energy waste, and improving the safety of use in areas with large temperature differences. 3. This invention modularizes the paraffin-based phase change material insulation board. Multiple sets of paraffin-based phase change material insulation boards are sequentially wrapped around the tank surface through the cooperation of the first and second mounting plates, which facilitates subsequent maintenance and replacement of the insulation boards and further improves the ease of use. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the liquid storage tank structure of the present invention; Figure 3 This is a schematic diagram of the metal cofferdam structure of the present invention; Figure 4 This is a schematic diagram of the hoisting assembly structure of the present invention; Figure 5This is a schematic diagram of the support beam structure of the present invention; Figure 6 This is a schematic diagram of the internal structure of the guide seat of the present invention; Figure 7 This is a schematic diagram of the guide frame structure of the present invention; Figure 8 This is a schematic diagram of the lifting arm structure of the present invention.

[0030] Explanation of reference numerals in the attached figures: 1. First equipment frame; 11. Support leg; 12. Second equipment frame; 13. Metal cofferdam; 131. Temperature monitoring sensor; 132. Semiconductor cooling chip; 14. Mounting frame; 141. First mounting plate; 15. Storage tank; 151. Tank body; 152. Second mounting plate; 153. Paraffin-based phase change material insulation board; 16. Inspection door; 17. High-drop pump pool; 18. Submersible pump; 2. Lifting assembly; 21. Support beam; 22. First mounting base; 23. First motor; 24. Guide seat; 25. Positioning groove; 26. Guide screw; 27. Linear guide rail; 28. Guide groove; 29. ​​Guide frame; 210. Transmission block; 211. Guide wheel assembly; 212. Lifting boom; 213. Winch; 214. Guide shaft; 215. Cable; 216. Hook; 217. Second mounting base; 218. Second motor. Detailed Implementation

[0031] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings. Example

[0032] This invention provides, for example Figures 1 to 3 The containerized LNG skid-mounted equipment shown includes a first equipment frame 1, a second equipment frame 12, and a metal cofferdam 13. The second equipment frame 12 is fixedly connected to the right end of the first equipment frame 1. Metal cofferdams 13 are fixedly connected to the sides of both the first equipment frame 1 and the second equipment frame 12. A liquid storage tank 15 is installed inside the first equipment frame 1. A high-drop pump pool 17 is installed inside the second equipment frame 12. A submersible pump 18 is installed inside the high-drop pump pool 17. Inspection doors 16 are installed at the right end of the second equipment frame 12 and the left end of the first equipment frame 1. The lower end of the second equipment frame 12 is lower than the lower end of the first equipment frame 1. Multiple sets of support legs 11 are fixedly connected to the lower end of the first equipment frame 1. Multiple sets of mounting frames 14 are fixedly connected to the inside of the first equipment frame 1. First mounting plates 141 are fixedly connected to the front and rear sides of the mounting frames 14.

[0033] Among them, the storage tank 15 is used to store liquid LNG. It adopts a skid-mounted integrated design of "storage tank 15, built-in high-drop pump pool 17 and submersible pump 18" to improve equipment integration, reduce pipeline laying, and reduce equipment construction and maintenance costs.

[0034] The height difference between the bottom of the second equipment rack 12 and the first equipment rack 1 is 80-120cm. The height difference naturally forms a sufficient liquid static pressure head, which can solve the cavitation phenomenon of the submersible pump 18 at low liquid levels without the need to add auxiliary pressurization equipment, thereby improving the utilization rate of LNG at low liquid levels.

[0035] Specifically, during the installation process, the liquid storage tank 15 is installed on the upper end of the mounting frame 14, the high drop pump pool 17 is installed on the inner side of the second equipment frame 12, and the two are connected by pipelines.

[0036] In a preferred embodiment, the storage tank 15 includes a tank body 151, a second mounting plate 152, and a paraffin-based phase change material insulation plate 153. The tank body 151 is fixedly mounted on the upper end of the mounting frame 14. The second mounting plate 152 is fixedly connected to the middle position of the upper surface of the tank body 151. The surface of the tank body 151 is covered with multiple sets of paraffin-based phase change material insulation plates 153. The two ends of the upper two sets of paraffin-based phase change material insulation plates 153 are fixedly connected to the first mounting plate 141 and the second mounting plate 152, respectively. The two ends of the lower paraffin-based phase change material insulation plate 153 are fixedly connected to the first mounting plates 141 on both sides, respectively. Multiple sets of temperature monitoring sensors 131 and semiconductor cooling chips 132 are installed on the inner surface of the metal dam 13.

[0037] Meanwhile, multiple sets of paraffin-based phase change material insulation plates 153 are installed on the surface of the tank 151. Using the first mounting plate 141, the second mounting plate 152 and bolts, the insulation plates are sequentially installed and wrapped around the surface of the tank 151. The paraffin-based phase change material stabilizes temperature fluctuations through latent heat absorption and release. At the same time, the temperature monitoring sensor 131 continuously monitors the internal temperature of the tank. When the evaporation rate is high, the semiconductor cooling chip 132 is activated to quickly cool the inside of the tank, achieving dynamic adjustment, stabilizing the internal pressure fluctuations of the tank 151, reducing the evaporation rate and improving utilization.

[0038] Furthermore, the modular paraffin-based phase change material insulation board 153 is easy to replace and maintain, further improving ease of use. Example

[0039] See Figure 1 , Figures 4 to 8The top of the second equipment frame 12 is equipped with a hoisting assembly 2, which includes a support beam 21, a linear guide rail 27, a guide frame 29, a hoisting arm 212, and a cable 215. Two sets of transverse support beams 21 are fixedly connected to the upper end of the second equipment frame 12. The lower surfaces of the two sets of support beams 21 are fixedly connected to the linear guide rails 27. The front and rear sides of the linear guide rails 27 are provided with two sets of upper and lower guide grooves 28. The front and rear sides of the guide frame 29 are fixedly connected to two sets of left and right guide wheel sets 211. The guide wheel sets 211 are slidably connected to the guide grooves 28. The hoisting arm 212 is fixedly connected to the right end of the guide frame 29. A winch 213 is rotatably connected to the inner side of the hoisting arm 212 near the left end. A guide shaft 214 is rotatably connected to the inner side of the hoisting arm 212 near the right end. The left end of the cable 215 is wound around the surface of the winch 213. The right end of the cable 215 passes through the guide shaft 214 and is fixedly connected to a hook 216.

[0040] The guide wheel assembly 211 cooperates with the guide groove 28, allowing the guide frame 29 to slide left and right on the lower side of the linear guide rail 27, thereby adjusting the left and right position of the lifting boom 212.

[0041] During use, open the inspection door 16 on the right end and move the lifting arm 212 to the upper position of the submersible pump 18. Next, move the cable 215 downward and use the straps to fix the submersible pump 18. Then, hang the upper end of the straps on the hook 216. At this time, retract the cable 215 to lift the submersible pump 18. After lifting, slide the guide frame 29 to the right, thereby driving the lifting arm 212 and the submersible pump 18 to move to the right and move the submersible pump 18 to the outside of the container. The submersible pump 18 can be inspected and maintained on the outside of the container, which improves the convenience of maintenance operations and avoids increasing the height and width of the container, thus improving the convenience of transportation and movement.

[0042] As a preferred embodiment, a second mounting base 217 is fixedly connected to the right side of the guide frame 29, and a second motor 218 is fixedly mounted on the side of the second mounting base 217. The output end of the second motor 218 is fixedly connected to the front end of the rotating shaft of the winch 213 through a coupling.

[0043] Specifically, during the winding and unwinding of the cable 215, the second motor 218 is started to rotate forward. During the forward rotation of the second motor 218, the winch 213 is driven to rotate clockwise, thereby unwinding the cable 215. The hook 216 is moved downward to fix the submersible pump 18. Then, the second motor 218 is started to rotate in reverse. During the reverse rotation of the second motor 218, the winch 213 is driven to rotate counterclockwise, winding the cable 215 and lifting the submersible pump 18 upward.

[0044] In a preferred embodiment, a transverse guide seat 24 is fixedly connected between the two sets of support beams 21. A transverse positioning groove 25 is provided on the lower wall of the guide seat 24. A guide screw 26 is rotatably connected between the inner walls of the left and right sides of the guide seat 24. A transmission block 210 is fixedly connected to the middle position of the upper surface of the guide frame 29. The upper end of the transmission block 210 passes through the positioning groove 25 and is threadedly connected to the guide screw 26. A first mounting base 22 is fixedly connected between the two sets of support beams 21 at the left end of the guide seat 24 and the linear guide rail 27. A first motor 23 is mounted on the surface of the first mounting base 22. The output end of the first motor 23 is fixedly connected to the left end of the guide screw 26 through a coupling.

[0045] In addition, during the sliding of the guide frame 29, the first motor 23 is started to rotate clockwise. During the clockwise rotation of the first motor 23, the guide screw 26 is rotated clockwise, which drives the transmission block 210 to slide to the right, thereby driving the guide frame 29 to slide to the right, pushing the lifting arm 212 and the submersible pump 18 to the right, and then moving the submersible pump 18 to the outside. When reinstalling the submersible pump 18, the first motor 23 is started to rotate counterclockwise. The first motor 23 drives the guide screw 26 to rotate counterclockwise, moving the submersible pump 18 back into the housing and assisting the operators in the installation.

[0046] The working principle of this invention is as follows: By installing the hoisting assembly 2 inside the second equipment rack 12 and installing the maintenance door 16 at the right end of the second equipment rack 12, and with the help of the left and right sliding guide frame 29, the lifting arm 212 and the cable 215, the submersible pump 18 is hoisted and then moved to the outside of the tank for maintenance through the maintenance door 16. This effectively increases the working and maintenance space, improves the convenience of maintenance, and effectively controls the height and left and right length of the tank, improving the convenience of transporting the tank. At the same time, by covering the surface of the tank 151 with a paraffin-based phase change material insulation board 153, the characteristics of the paraffin-based phase change material are used to absorb and release latent heat, stabilizing the temperature fluctuation inside the tank 151. At the same time, the semiconductor cooling chip 132 is used to cool the inside of the tank, reducing the evaporation rate, reducing energy waste, and improving the safety of use in areas with large temperature differences.

[0047] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A box-type LNG skid-mounted equipment, comprising a first equipment frame (1), a second equipment frame (12), and a metal cofferdam (13), characterized in that: The second equipment frame (12) is fixedly connected to the right end of the first equipment frame (1). Metal cofferdams (13) are fixedly connected to the sides of both the first equipment frame (1) and the second equipment frame (12). A liquid storage tank (15) is installed on the inner side of the first equipment frame (1). A high-drop pump pool (17) is installed on the inner side of the second equipment frame (12). A submersible pump (18) is installed inside the high-drop pump pool (17). Inspection doors (16) are installed on the right end of the second equipment frame (12) and the left end of the first equipment frame (1). A hoisting assembly (2) is installed on the top of the second equipment frame (12). The hoisting assembly (2) includes a support beam (21), a linear guide rail (27), a guide frame (29), a lifting arm (212), and a cable (215).

2. The containerized LNG skid-mounted equipment according to claim 1, characterized in that: The lower end of the second equipment rack (12) is lower than the lower end of the first equipment rack (1). The lower end of the first equipment rack (1) is fixedly connected to multiple sets of support feet (11). The inner side of the first equipment rack (1) is fixedly connected to multiple sets of mounting racks (14). The front and rear sides of the mounting rack (14) are fixedly connected to a first mounting plate (141).

3. The containerized LNG skid-mounted equipment according to claim 2, characterized in that: The storage tank (15) includes a tank body (151), a second mounting plate (152), and a paraffin-based phase change material insulation plate (153). The tank body (151) is fixedly installed on the upper end of the mounting frame (14). The second mounting plate (152) is fixedly connected to the middle position of the upper surface of the tank body (151). The surface of the tank body (151) is covered with multiple sets of paraffin-based phase change material insulation plates (153). The two ends of the upper two sets of paraffin-based phase change material insulation plates (153) are fixedly connected to the first mounting plate (141) and the second mounting plate (152) respectively. The two ends of the lower paraffin-based phase change material insulation plate (153) are fixedly connected to the first mounting plates (141) on both sides respectively.

4. The containerized LNG skid-mounted equipment according to claim 1, characterized in that: The inner surface of the metal cofferdam (13) is equipped with multiple sets of temperature monitoring sensors (131) and semiconductor cooling chips (132).

5. A box-type LNG skid-mounted equipment according to claim 1, characterized in that: The upper end of the second equipment frame (12) is fixedly connected to two sets of transverse support beams (21). The lower surfaces of the two sets of support beams (21) are fixedly connected to linear guide rails (27). The front and rear sides of the linear guide rails (27) are provided with two sets of upper and lower guide grooves (28). The front and rear sides of the guide frame (29) are fixedly connected to two sets of left and right guide wheel groups (211). The guide wheel groups (211) are slidably connected to the guide grooves (28).

6. A box-type LNG skid-mounted equipment according to claim 5, characterized in that: The lifting boom (212) is fixedly connected to the right end of the guide frame (29). A winch (213) is rotatably connected to the inner side of the lifting boom (212) near the left end. A guide shaft (214) is rotatably connected to the inner side of the lifting boom (212) near the right end. The left end of the cable (215) is wound around the surface of the winch (213). The right end of the cable (215) passes through the guide shaft (214) and is fixedly connected to a hook (216).

7. A box-type LNG skid-mounted equipment according to claim 6, characterized in that: The guide frame (29) is fixedly connected to the right side of a second mounting base (217), and a second motor (218) is fixedly mounted on the side of the second mounting base (217). The output end of the second motor (218) is fixedly connected to the front end of the rotating shaft of the winch (213) through a coupling.

8. A box-type LNG skid-mounted equipment according to claim 5, characterized in that: A transverse guide seat (24) is fixedly connected between the two sets of support beams (21). A transverse positioning groove (25) is provided on the lower wall of the guide seat (24). A guide screw (26) is rotatably connected between the inner walls of the left and right sides of the guide seat (24).

9. A box-type LNG skid-mounted equipment according to claim 8, characterized in that: A transmission block (210) is fixedly connected to the middle position of the upper surface of the guide frame (29). The upper end of the transmission block (210) passes through the positioning groove (25) and is threadedly connected to the guide screw (26).

10. A box-type LNG skid-mounted equipment according to claim 9, characterized in that: A first mounting base (22) is fixedly connected between the two sets of support beams (21) at the left end of the guide seat (24) and the linear guide rail (27). A first motor (23) is mounted on the surface of the first mounting base (22). The output end of the first motor (23) is fixedly connected to the left end of the guide screw (26) through a coupling.

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