LNG direct cooling ice making machine and ice making method thereof

Abstract

The present invention discloses an LNG direct cooling ice making machine, including a main support, an LNG ice making system, an ice melting system and a control system. The LNG ice making system includes an LNG circulating refrigeration pipeline, an ice mold and a lifting platform. The ice mold is fixedly installed on the upper half of the ice making area of ​​the main support, and the lifting platform is installed below the ice mold; the LNG circulating refrigeration pipeline includes an input pipe, an output pipe, an upper converging pipe, a lower shunt pipe and a plurality of liquid cooling pipes, and the plurality of liquid cooling pipes are installed in the through holes of the vertical partition. The ice melting system includes a heat medium energy storage tank, a heat medium circulation pump, a heat medium circulation pipeline and a heating device. The heat medium circulation pipeline includes a conveying pipe, a shunt pipe, a plurality of heat dissipation pipes, a converging pipe and a recovery pipe. The plurality of heat dissipation pipes are also installed in the through holes of the vertical partition. The control system is used to control the operation of the entire device. The present invention makes full use of the cold energy generated during the LNG gasification process to complete the production of ice cubes. It has a simple and novel structure and high safety; the cold energy utilization efficiency is high, the ice making time is short, and the later maintenance is convenient.

Description

Technical Field

[0001] The invention relates to the technical field of LNG application, and in particular to an LNG direct cooling ice making machine and an ice making method thereof. Background Art

[0002] LNG (Liquefied Natural Gas), the abbreviation of liquefied natural gas, is becoming more and more popular as a clean energy source. Many countries have listed LNG as the preferred fuel, and the proportion of natural gas in energy supply has increased rapidly. However, as the material basis for human survival and social development, energy utilization efficiency is generally low at this stage, and most of the useful energy is directly discharged as waste, and has not been reasonably and effectively utilized. For example, with the increase in demand for natural gas consumption, a large amount of cold energy will be released during LNG gasification during use. Since most LNG receiving stations are built on the coast, the cold energy released during the LNG gasification process is directly carried away by seawater or air, resulting in a waste of cold energy and not being utilized. Summary of the invention

[0003] The purpose of the present invention is to solve the deficiencies of the above-mentioned prior art and to provide an LNG direct cooling ice making machine and an ice making method thereof.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: an LNG direct cooling ice maker, including a main bracket, an LNG ice making system, an ice melting system and a control system. The main bracket is divided into a control area and an ice making area; the LNG ice making system includes an LNG circulating refrigeration pipeline, an ice mold and a lifting platform. The ice mold is fixedly installed in the upper half of the ice making area of ​​the main bracket, and is made of a plurality of horizontal partitions and a plurality of vertical partitions that are vertically staggered. It is open at the top and bottom, and the vertical partitions are provided with a plurality of through holes that penetrate the length direction of the vertical partitions. The lifting platform is installed below the ice mold, including a double-headed stepper motor, a T-type gear commutator, a screw lift, a drive shaft, a transmission shaft and a flat base. The double-headed stepper motor is fixedly installed at the center position of the outer side of the left end of the ice mold, and the rotating shafts at both ends are respectively fixedly connected to a drive shaft through a coupling, and the other ends of the two drive shafts are respectively connected to a T-type gear commutator through a coupling. The two T-type gear commutators are respectively fixedly installed on the two vertical brackets on the left side of the main bracket. Its installation height is flush with the double-headed stepper motor. The output end of the T-gear commutator is connected to multiple screw lifts in sequence through the transmission shaft. The screw lifts are fixedly installed on the outer side of the middle beam of the bracket at the lower end of the ice mold, symmetrically front and back, and flush with the T-gear commutator; the front and rear sides of the flat base are respectively provided with protruding hanging ears corresponding to the screw lifts, and the lower end of the screw in the screw lift is fixedly connected to the protruding hanging ears, driving the flat base to move up and down; the LNG circulating refrigeration pipeline is divided into a conveying part and a refrigeration part. The conveying part includes an input pipe, an output pipe, an upper confluence pipe and a lower diversion pipe. The refrigeration part includes multiple liquid cooling pipes in an S-shaped loop, which are installed in the through holes of the vertical partition. The two ends of the liquid cooling pipe are respectively connected to the upper confluence pipe and the lower diversion pipe, the input pipe is connected to the lower diversion pipe, and the output pipe is connected to the upper confluence pipe.

[0005] The ice-melting system includes a heat medium energy storage tank, a heat medium circulation pump, a heat medium circulation pipeline and a heating device. The heat medium energy storage tank is fixedly installed on the rear side of the main support control area, and a discharge port is provided at the lower part to communicate with the heat medium circulation pump. The heat medium circulation pump is connected to the heat medium circulation pipeline. The heat medium circulation pipeline includes a delivery pipe, a shunt pipe, a plurality of heat dissipation pipes, a converging pipe and a recovery pipe. The delivery pipe is connected to the heat medium circulation pump and the shunt pipe. The plurality of heat dissipation pipes are respectively installed in the through holes of the vertical partition, and the lower ends thereof are connected to the shunt pipe, and the upper ends thereof are connected to the converging pipe. The converging pipe is connected to the heat medium energy storage tank through the recovery pipe. The heating device is fixedly installed on the heat medium energy storage tank.

[0006] The control system includes a PLC explosion-proof control cabinet, a temperature sensor, a pressure sensor and a control valve. The PLC explosion-proof control cabinet is fixedly installed on the front side of the main support control area to control the operation of the entire device; the temperature sensor, pressure sensor and control valve are installed on the LNG circulating refrigeration pipeline.

[0007] Furthermore, an LNG direct cooling ice making machine also includes an ice pushing device. The ice pushing device is fixedly installed at the junction of the control area and the ice making area of ​​the main bracket, located in the control area, and includes a control motor, a hydraulic telescopic cylinder and an ice pushing rack. The hydraulic telescopic cylinder is fixedly installed on the main bracket, and its telescopic rod points to the ice making area. The end of the telescopic rod is fixedly connected to the ice pushing rack. The ice pushing rack is installed vertically with the telescopic rod and presents a rectangular structure. Its length is slightly smaller than the width of the main bracket. The control motor is installed beside the hydraulic telescopic cylinder to provide power.

[0008] Furthermore, the flat plate base in the lifting platform is in a sealed state when in contact with the lower end of the ice mold.

[0009] Furthermore, the through holes arranged on the vertical partition are of double-hole specification, one through hole is installed with a liquid cooling pipe, and the other through hole is installed with a heat dissipation pipe, and the two pipelines are installed alternately; a temperature sensor, a pressure sensor and a low-temperature pneumatic stop valve are installed on the output pipe of the LNG circulating refrigeration pipeline, and the temperature sensor, the pressure sensor and the low-temperature pneumatic stop valve are all connected to the PLC explosion-proof control cabinet; a stop valve is installed on the delivery pipe and the recovery pipe in the heat medium circulation pipeline.

[0010] Furthermore, the outer side of the ice mold is wrapped with polyurethane foam insulation material.

[0011] Furthermore, the lower end of the ice pusher is higher than the upper surface of the flat plate base in the falling state; sliding wheels are also provided at the upper parts of both ends of the ice pusher, and railings are provided at the lower parts of the front and rear sides of the main bracket, and slide rails are provided on the inner side of the upper cross bar of the railings to match the sliding wheels.

[0012] Furthermore, the transmission shaft for linking two adjacent screw lifts is fixed by a seat bearing; the two output ends of the double-headed stepper motor run synchronously, driving all the screw lifts to run synchronously, so that the flat base moves up and down horizontally.

[0013] Furthermore, the heating device adopts a solar heating system; or is an electric heating device.

[0014] Furthermore, explosion-proof safety valves are installed on the pipelines of the transport parts of the LNG circulation refrigeration pipeline and the heat medium circulation pipeline.

[0015] An LNG direct cooling ice making method, using the above-mentioned LNG direct cooling ice making machine, comprises the following steps:

[0016] Step 1: The PLC explosion-proof control cabinet controls the operation of the lifting platform, the flat base rises and seals with the lower end of the ice mold, and water is injected from the upper end of the ice mold;

[0017] Step 2: The LNG is introduced into the LNG circulation refrigeration pipeline in the ice maker under the pressure of the storage tank, enters from the input pipe, and is diverted into multiple liquid cooling pipes through the lower diverter pipe. The LNG is gasified in the liquid cooling pipe and the cold energy contained in it is exchanged with water through the ice mold to form ice cubes.

[0018] Step 3: Turn off the LNG input, and the heat medium enters the delivery pipe under the action of the heat medium circulation pump, and is divided into multiple heat dissipation pipes through the diversion pipe to exchange heat with the surface of the ice cube, so that the surface of the ice cube in contact with the ice mold melts;

[0019] Step 4: The PLC explosion-proof control cabinet controls the lifting platform to operate in reverse, the flat base descends, and the ice cubes descend to the bottom along with the flat base under the action of their own gravity; the ice pushing device operates to push the ice cubes out.

[0020] Compared with the prior art, the present invention has the following beneficial effects: the LNG direct cooling ice making machine of the present invention is designed as a skid, the whole machine is explosion-proof, and the cold energy generated by the gasification process of liquefied natural gas flowing through the pipeline is used to exchange cold with water through ice molds to complete the production of ice cubes. It has a simple and novel structure and high safety; it does not require an intermediate conversion medium, has high cold energy utilization efficiency, short ice making time, simple on-site construction or pipeline modification, and convenient later maintenance. At the same time, all electrical components in the equipment are explosion-proof, and the whole machine can be directly placed in the gasification station area for use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the northeast isometric structure of the present invention;

[0022] Figure 2 It is a schematic diagram of the northwest isometric structure of the present invention;

[0023] Figure 3 is a top view of the present invention;

[0024] Figure 4 is a front view of the present invention;

[0025] Figure 5 yes Figure 1 A magnified view of middle;

[0026] Figure 6 yes Figure 2 Enlarged view of middle B;

[0027] In the figure: 1. Main bracket, 2. Ice mold, 6. PLC explosion-proof control cabinet, 8. Railing;

[0028] 101, bottom bracket, 102, middle reinforcing rod, 103, middle cross beam, 104, vertical bracket, 201, vertical partition, 202, horizontal partition, 203, through hole, 301, flat base, 302, double-headed stepper motor, 303, T-type gear commutator, 304, screw lift, 305, drive shaft, 306, transmission shaft, 307, bearing with seat, 308, protruding ear, 309, coupling, 310, screw, 311, fixed seat, 312, fixed platform, 401, LNG inlet, 402, LNG gasification outlet, 40 3. Liquid cooling pipe, 404. Lower shunt pipe, 405. Upper confluence pipe, 406. Output pipe, 407. Input pipe, 408. Pressure sensor, 409. Low-temperature pneumatic stop valve, 410. Explosion-proof safety valve, 501. Heat medium energy storage tank, 502. Heat medium circulation pump, 503. Diverter pipe, 504. Confluence pipe, 505. Recovery pipe, 506. Delivery pipe, 507. Heat dissipation pipe, 508. Solar panel, 509. Heat medium replacement port, 701. Control motor, 702. Hydraulic telescopic cylinder, 703. Ice push rack, 704. Pulley, 705. Slide rail. DETAILED DESCRIPTION

[0029] It should be noted that, in the present invention, the directions or positional relationships indicated by terms such as "upper", "lower", "left", "right", "front", "back", etc. are based on the directions or positional relationships shown in the accompanying drawings. They are relational words determined only for the convenience of describing the structural relationships of the various components of the present invention. They do not specifically refer to any component in the present invention and should not be understood as limitations on the present invention.

[0030] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings:

[0031] Combination Figures 1 to 4 , an LNG direct cooling ice machine, including a main bracket 1, an LNG ice making system, an ice melting system and an intelligent control system. The main bracket 1 is a rectangular frame structure, and its bottom is welded with I-shaped sheet metal, which is used to elevate the entire device to prevent the erosion of the equipment by ground water vapor. The side of the I-shaped sheet metal is also provided with a reinforcing rib plate to improve the stability of the entire device; the upper frame of the main bracket 1 is welded with multiple square tubes, which is convenient for fixing and installing other devices. At the same time, the main bracket 1 is divided into two areas: a control area and an ice making area. The left side of the main bracket 1 is the ice making area, and the right side is the control area. A variety of pipelines are also arranged and installed in the control area.

[0032] The above-mentioned LNG ice-making system includes an LNG circulating refrigeration pipeline, an ice mold 2 and a lifting platform; the ice mold 2 is fixedly installed in the upper half of the ice-making area of ​​the main bracket 1, and is made of multiple horizontal partitions 202 and multiple vertical partitions 201 that are vertically staggered to each other, forming an ice cavity inside, and the ice cavity is opened up and down, and can be set to different sizes according to the needs of ice making. The lower end of the ice mold 2 is flush with the middle cross beam 103 of the main bracket 1; a plurality of through holes 203 are provided on the vertical partition 201, which penetrate the vertical partition 201 in the length direction, and the through holes 203 are set to a double-hole specification and are arranged at equal intervals. The lifting platform is installed below the ice mold 2, and includes a double-headed stepper motor 302, a T-type gear commutator 303, a screw lift 304, a drive shaft 305, a transmission shaft 306 and a flat base 301. The double-headed stepper motor 302 is fixedly installed on the middle crossbeam of the main bracket 1 located at the left end of the ice mold 2, and is located in the middle position of the left end of the ice mold 2. The two output shaft ends of the double-headed stepper motor 302 are respectively fixedly connected to a drive shaft 305 through a coupling 309, and the other end of the drive shaft 305 is linked to the T-type gear commutator 303; the T-type gear commutator 303 located in the front half of the ice mold 2 is installed on the vertical bracket 104 on the left front side of the main bracket 1 through a fixed platform 312, and the fixed platform 312 is horizontally installed at the outer right angle of the vertical bracket 104. The T-type gear commutator 303 is fixedly installed on the fixed platform 3 by bolts 12, its installation height is flush with the installation height of the double-headed stepper motor 302, the output end of the T-type gear commutator 303 is connected to a transmission shaft 306 through a coupling, the end of the transmission shaft 306 is connected to a screw lift 304, the screw lift 304 is then linked to two screw lifts 304 in sequence through the transmission shaft 306, and the three screw lifts 304 are respectively fixedly installed on the middle cross beam 103 on the front side of the ice-making area of ​​the main bracket 1 through a horizontal T-type base, and its installation height is consistent with the installation height of the T-type gear commutator 303. A bearing 307 with a seat is also mounted on the transmission shaft 306 between two adjacent screw lifts 304 to stabilize the transmission shaft 306, prevent vibration, and ensure horizontal transmission; the installation of the lifting device located in the rear half of the ice mold 2 is the same as the arrangement of the above-mentioned front half, and is symmetrical with the horizontal center line. The flat base 301 is located directly below the ice mold 2, and its area is the same as the lower end of the ice mold 2. The positions around the flat base 301 that contact the lower end of the ice mold 2 are sealed to prevent water leakage during ice making. Three protruding ears 308 are respectively provided on the front and rear sides of the flat base 301, which correspond to the screw lifters 304 respectively. The lower ends of the screw rods 310 in the screw lifters 304 are fixedly connected to the corresponding protruding ears 308 through fixing seats 311, which can drive the flat base 301 to move up and down in a horizontal state.The LNG circulation refrigeration pipeline can be divided into a transport part and a refrigeration part. The transport part is installed in the control area of ​​the main support 1, including an input pipe 407, an output pipe 406, a lower shunt pipe 404 and an upper converging pipe 405. The refrigeration part is installed in the vertical partition 201 of the ice mold 2, including a plurality of liquid cooling pipes 403 in an S-shaped loop; one end of the input pipe 407 is provided with an LNG inlet 401, and the other end is connected to the lower shunt pipe 404, and the lower shunt pipe 404 is connected to the plurality of liquid cooling pipes 403. At the lower end, the liquid cooling pipe 403 passes through the through hole 203 on the vertical partition 201, and the upper end is connected to the upper confluence pipe 405, and the upper confluence pipe 405 is connected to the output pipe 406. An LNG gasification outlet 402 is arranged at the end of the output pipe 406; a low-temperature pneumatic stop valve 409 and an explosion-proof safety valve 410 are respectively installed on the input pipe 407 and the output pipe 406, and a pressure gauge, a temperature sensor and a pressure sensor 408 are also added to the pipeline of the output pipe 406 to monitor the LNG circulation refrigeration pipeline in real time.

[0033] The above-mentioned de-icing system includes a heat medium energy storage tank 501, a heat medium circulation pump 502, a heat medium circulation pipeline and a heating device. The heat medium energy storage tank 501 is fixedly installed at the rear side of the control area of ​​the main bracket 1, and a heat medium replacement port 509 is provided at the bottom of the outer wall thereof for replacing the internal heat medium at any time; a heat medium discharge port is provided on one side of the interior, and the heat medium discharge port is connected to the heat medium circulation pump 502 through a pipeline; the heat medium circulation pipeline includes a delivery pipe 506, a shunt pipe 503, and a plurality of heat dissipation pipes 507 , a confluence pipe 504 and a recovery pipe 505, one end of the delivery pipe 506 is connected to the outlet of the heat medium circulation pump 502, and the other end is connected to the shunt pipe 503, the shunt pipe 503 is connected to the lower ends of several heat dissipation pipes 507, the heat dissipation pipes 507 pass through the through holes 203 provided on the vertical partition 201, the upper ends of the heat dissipation pipes 507 are connected to the confluence pipe 504, the confluence pipe 504 is connected to one end of the recovery pipe 505, and the other end of the recovery pipe 505 is connected to the heat medium energy storage tank 501 to complete the circulation. One-way stop valves are also installed on the delivery pipe 506 and the recovery pipe 505 to ensure the circulation safety of the heat medium. The heating device uses a solar panel 508, which is fixedly installed on the upper side of the heat medium energy storage tank 501 to provide heat energy for the heat medium in real time, and an electric heater is installed to ensure that the ice melting process is not affected by external conditions such as weather.

[0034] Further, refer to Figure 6 The liquid cooling pipe 403 in the above-mentioned LNG circulation refrigeration pipeline and the heat dissipation pipe 507 in the heat medium circulation pipeline are both installed in the through hole 203 provided on the vertical partition 201. The through hole 203 is a double-hole setting. The heat dissipation pipe 507 is installed in the lower hole of the same through hole 203, and the liquid cooling pipe 403 is installed in the upper hole. The two pipelines are installed alternately and back and forth without being connected or directly contacted, thereby ensuring uniform temperature supply.

[0035] The above-mentioned intelligent control system includes a PLC explosion-proof control cabinet 6, which is fixedly installed on the front crossbeam of the control area of ​​the main bracket 1, and a PLC control system is installed inside to control the operation of the entire device; the above-mentioned low-temperature pneumatic stop valve 409, temperature sensor, pressure sensor 408 and lifting platform are all connected to the PLC explosion-proof control cabinet 6. During the entire ice-making process, all sensors monitor in real time and transmit data to the PLC control system. The PLC control system processes the received signals to complete intelligent control.

[0036] The LNG direct cooling ice making machine also includes an ice pushing device, combined with Figure 3 and Figure 5 The ice-pushing device is fixedly installed at the junction of the control area and the ice-making area of ​​the main support 1, located in the lower half of the control area, and includes a control motor 701, a hydraulic telescopic cylinder 702 and an ice-pushing rack 703. The end of the hydraulic telescopic cylinder 702 is fixed to the vertical support rod on the right side of the main support 1 through a hinged base, and its telescopic rod points to the ice-making area. The control motor 701 is located beside the hydraulic telescopic cylinder 702 and is fixedly installed on the base crossbeam of the main support 1 to provide power for the hydraulic telescopic cylinder 702; the end of the telescopic rod is fixedly connected to the center of the ice-pushing rack 703 and is vertical to the ice-pushing rack 703 as a whole. The ice-pushing rack 703 is a rectangular frame structure, which is flush with the side facing the ice-making area of ​​the main support 1; the length of the ice-pushing rack 703 is less than the width of the main support 1, and the installation height of its lower end surface is higher than the upper surface of the flat base 301 when it is in a falling state to avoid mutual obstruction; pulleys 704 are also provided on the upper cross bars at the front and rear ends of the ice-pushing rack 703 to assist the left and right sliding of the ice-pushing rack 703. Starting from the front and rear sides of the main support 1 and the position where the self-propelled ice rack 703 is in a retracted state, a railing 8 is extended to the ice-making area of ​​the main support 1, and a slide rail 705 is provided on the inner side of the upper cross bar of the railing 8, which is compatible with the pulley 704; the railing 8 located in the ice-making area of ​​the main support 1 is intermittently separated to separate the upper and lower activity space of the protruding hanging ears 308 on the flat base 301, and at the same time prevent the ice cubes from sliding off.

[0037] When in use, first control the double-headed stepper motor 302 through the control cabinet, and its two output ends run synchronously. With the help of the transmission effect of the drive shaft 305 and the transmission shaft 306, all the screw lifts 304 are driven to run synchronously, so that the flat base 301 rises horizontally and fits tightly with the bottom of the ice mold 2 to complete the seal, and then water is injected into the formed ice cavity from the upper opening of the ice mold 2. Before ice making begins, the heat medium in the heat dissipation pipe 507 is completely discharged into the heat medium energy storage tank 501 by using a valve to prevent the heat medium from freezing during the LNG cooling process; when ice making begins, LNG enters the input pipe 407 through the LNG inlet 401, and then branches to each liquid cooling pipe 403 through the lower shunt pipe 404 for heat exchange, condensing the water in the ice mold 2 into ice cubes, and the LNG after heat exchange is gasified in the output pipe 406 for subsequent use. When the water in the ice mold 2 is completely turned into ice, the introduction of LNG is stopped, and the heat medium in the heat medium storage tank 501 enters the delivery pipe 506 under the action of the heat medium circulation pump 502, and enters the heat dissipation pipe 507 through the shunt pipe 503, and exchanges heat with the surface of the ice, so that the surface of the ice contacting the ice mold 2 melts. At this time, the double-headed stepper motor 302 rotates in the reverse direction, so that the flat base 301 slowly separates from the bottom of the ice mold 2, and the ice escapes from the ice mold 2 under its own gravity and falls on the flat base 301. The heat medium then enters the heat medium storage tank 501 through the confluence pipe 504 and the recovery pipe 505 for storage and heating. After the flat base 301 descends to the bottom of the main bracket 1, the control motor 701 in the ice pushing device operates, and the telescopic rod in the hydraulic telescopic cylinder 702 extends, pushing the ice pushing rack 703 to move to the left along the slide rail 705 on the railing 8, and slowly pushes the ice out of the ice making area to complete ice making.

[0038] In other embodiments of the present invention, the outer side of the ice mold 2 is wrapped with polyurethane foam insulation material.

[0039] Finally, it should be noted that the description of the above implementation mode is only used to illustrate the technical solution of the present invention, and is not a limitation of the present invention. The present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the scope of protection of the present invention.

Claims

1. An LNG direct cooling ice making machine, characterized in that: It includes a main support, an LNG ice-making system, an ice-melting system and a control system. The main support is divided into a control area and an ice-making area. The LNG ice-making system includes an LNG circulating refrigeration pipeline, an ice mold and a lifting platform. The ice mold is fixedly installed on the upper half of the ice-making area of ​​the main support. It is made of multiple horizontal partitions and multiple vertical partitions that are vertically staggered. It has upper and lower openings. The vertical partitions are provided with multiple through holes that run through the length direction of the vertical partitions. The lifting platform is installed below the ice mold and includes a double-headed stepper motor, a T-type gear commutator, a screw lift, a drive shaft, a transmission shaft and a flat base. The double-headed stepper motor is fixedly installed at the center position of the outer side of the left end of the ice mold. The rotating shafts at both ends are respectively fixedly connected to a drive shaft through a coupling. The other ends of the two drive shafts are respectively connected to a T-type gear commutator through a coupling. The two T-type gear commutators are respectively fixedly installed on the main support. On the two vertical brackets on the left side of the frame, the installation height is flush with the double-headed stepper motor. The output end of the T-gear commutator is connected to multiple screw lifts in sequence through the transmission shaft. The screw lifts are fixedly installed on the outer side of the middle beam of the bracket at the lower end of the ice mold, symmetrically front and back, and flush with the T-gear commutator; the front and rear sides of the flat base are respectively provided with protruding hanging ears corresponding to the screw lifts, and the lower end of the screw in the screw lift is fixedly connected to the protruding hanging ears to drive the flat base to move up and down; the LNG circulating refrigeration pipeline is divided into a conveying part and a refrigeration part. The conveying part includes an input pipe, an output pipe, an upper confluence pipe and a lower diversion pipe. The refrigeration part includes a plurality of liquid cooling pipes in an S-shaped loop, which are installed in the through holes of the vertical partition. The two ends of the liquid cooling pipe are respectively connected to the upper confluence pipe and the lower diversion pipe, the input pipe is connected to the lower diversion pipe, and the output pipe is connected to the upper confluence pipe; The de-icing system includes a heat medium energy storage tank, a heat medium circulation pump, a heat medium circulation pipeline and a heating device. The heat medium energy storage tank is fixedly installed at the rear side of the main support control area, and a discharge port is provided at the lower part to communicate with the heat medium circulation pump. The heat medium circulation pump is connected with the heat medium circulation pipeline. The heat medium circulation pipeline includes a delivery pipe, a shunt pipe, a plurality of heat dissipation pipes, a confluence pipe and a recovery pipe. The delivery pipe is connected with the heat medium circulation pump and the shunt pipe. The plurality of heat dissipation pipes are respectively installed in the through holes of the vertical partition, and the lower end thereof is connected with the shunt pipe, and the upper end thereof is connected with the confluence pipe. The confluence pipe is connected with the heat medium energy storage tank through the recovery pipe. The heating device is fixedly installed on the heat medium energy storage tank; The control system includes a PLC explosion-proof control cabinet, a temperature sensor, a pressure sensor and a control valve. The PLC explosion-proof control cabinet is fixedly installed on the front side of the main support control area to control the operation of the entire device; the temperature sensor, the pressure sensor and the control valve are installed on the LNG circulation refrigeration pipeline; It also includes an ice-pushing device, which is fixedly installed at the junction of the control area and the ice-making area of ​​the main bracket, located in the control area, and includes a control motor, a hydraulic telescopic cylinder and an ice-pushing rack. The hydraulic telescopic cylinder is fixedly installed at the bottom of the main bracket, and its telescopic rod points to the ice-making area. The end of the telescopic rod is fixedly connected to the ice-pushing rack. The ice-pushing rack is installed vertically with the telescopic rod and presents a rectangular structure. Its length is slightly smaller than the width of the main bracket. The control motor is installed beside the hydraulic telescopic cylinder to provide power. The lower end of the ice pusher is higher than the upper surface of the flat plate base in the falling state; sliding wheels are also provided at the upper parts of both ends of the ice pusher, and railings are provided at the lower parts of the front and rear sides of the main bracket, and slide rails are provided on the inner side of the upper cross bar of the railing to match the sliding wheels.

2. The LNG direct cooling ice making machine according to claim 1, characterized in that: The flat plate base in the lifting platform is in a sealed state when in contact with the lower end of the ice mold.

3. The LNG direct cooling ice making machine according to claim 1, characterized in that: The through holes arranged on the vertical partition are of double-hole specification, one through hole is installed with a liquid cooling pipe, the other through hole is installed with a heat dissipation pipe, and the two pipelines are installed alternately; a temperature sensor, a pressure sensor and a low-temperature pneumatic stop valve are installed on the output pipe of the LNG circulating refrigeration pipeline, and the temperature sensor, the pressure sensor and the low-temperature pneumatic stop valve are all connected to the PLC explosion-proof control cabinet; a stop valve is installed on the delivery pipe and the recovery pipe in the heat medium circulation pipeline.

4. The LNG direct cooling ice making machine according to claim 1, characterized in that: The outer side of the ice mold is wrapped with polyurethane foaming heat-insulating material.

5. The LNG direct cooling ice making machine according to claim 1, characterized in that: The transmission shaft used for linking two adjacent screw lifts is fixed by a seat bearing; the two output ends of the double-headed stepper motor run synchronously, driving all the screw lifts to run synchronously, so that the flat base moves up and down horizontally.

6. The LNG direct cooling ice making machine according to claim 1, characterized in that: The heating device adopts a solar heating system; or is an electric heating device.

7. The LNG direct cooling ice making machine according to claim 1, characterized in that: Explosion-proof safety valves are installed on the pipelines of the transport parts of the LNG circulation refrigeration pipeline and the heat medium circulation pipeline.

8. An LNG direct cooling ice making method, using the LNG direct cooling ice making machine according to any one of claims 1 to 7, characterized in that: Step 1: The PLC explosion-proof control cabinet controls the operation of the lifting platform, the flat base rises and seals with the lower end of the ice mold, and water is injected from the upper end of the ice mold; Step 2: The LNG is introduced into the LNG circulation refrigeration pipeline in the ice maker under the pressure of the storage tank, enters from the input pipe, and is diverted into multiple liquid cooling pipes through the lower diverter pipe. The LNG is gasified in the liquid cooling pipe and the cold energy contained in it is exchanged with water through the ice mold to form ice cubes. Step 3: Turn off the LNG input, and the heat medium enters the delivery pipe under the action of the heat medium circulation pump, and is divided into multiple heat dissipation pipes through the diversion pipe to exchange heat with the surface of the ice cube, so that the surface of the ice cube in contact with the ice mold melts; Step 4: The PLC explosion-proof control cabinet controls the lifting platform to operate in reverse, the flat base descends, and the ice cubes descend to the bottom along with the flat base under the action of their own gravity; The ice pushing device operates to push out the ice cubes.

Images